CN112268713B

CN112268713B - Hydraulic drive base assembly of automobile air brake valve and brake cylinder test bed

Info

Publication number: CN112268713B
Application number: CN202011246137.7A
Authority: CN
Inventors: 马宇骋; 马恩; 龚贤武; 陈金平; 相里康
Original assignee: Changan University; Nanyang Institute of Technology
Current assignee: Changan University; Nanyang Institute of Technology
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2022-05-17
Anticipated expiration: 2040-11-10
Also published as: CN112268713A

Abstract

The invention discloses a hydraulic drive base assembly of an automobile air brake valve and brake cylinder test bed. The hydraulic driving speed-changing walking, speed-changing steering and braking capabilities are flexible, the strength and the rigidity are good, the test preparation time is short, the maintenance and the maintenance are convenient, the working efficiency is high, the installation is convenient, and the flexibility of speed-changing walking, speed-changing steering and braking of the hydraulic driving base assembly of the automobile air brake valve and the brake cylinder test bed is well guaranteed when the hydraulic driving base assembly is maintained, maintained and used, the maintenance efficiency of test operators on the test bed is improved, the service life of the automobile air brake valve and the brake cylinder test bed is prolonged, the labor intensity of the test operators is relieved, the test preparation time is shortened, the working efficiency of the test operators is improved, and the test performance of the automobile air brake valve and the brake cylinder test bed is guaranteed.

Description

Hydraulic drive base assembly of automobile air brake valve and brake cylinder test bed

Technical Field

The invention belongs to the technical field of automobile manufacturing, and relates to a test bed hydraulic drive base assembly for testing performance, reliability and durability of an air brake valve and a brake cylinder, in particular to a test bed hydraulic drive base assembly for an automobile air brake valve and a brake cylinder.

Background

At present, all test beds for testing the performance, reliability and durability of automobile air brake valves and brake cylinders produced at home and abroad are tested on different special test beds, the performance of the air brake valves is tested on the special test beds for the performance of the air brake valves, and the reliability and durability of the air brake valves are tested on the special test beds for the reliability and durability tests of the air brake valves. Similarly, brake cylinder performance was tested on a test bed dedicated to brake cylinder performance, and brake cylinder reliability and durability tests were tested on a test bed dedicated to brake cylinder reliability and durability tests. The special test beds are fixed in a test room and have the advantages of simple structure, moderate price, easy manufacture and the like. However, the base of the special test bed is fixed on the ground through anchor bolts, and is not convenient to move. The labor intensity of test operators is high when the test operators maintain and repair the special test bed, the preparation time before the test is long, the operators are easy to be tired, the labor intensity is increased, and the working efficiency is low. The inventor of the applicant applies Chinese patent application No. 2019100646079 on 23/1/2019, and the name of the application is 'multifunctional test bed base assembly of air brake valve and brake chamber of agricultural tractor' (application No. 2019100646079), and the name of the application of the utility model patent applied on the same day is 'multifunctional test bed base assembly of air brake valve and brake chamber of agricultural tractor' (application No. 201920114305.3), and adopts the single-shaft drive test bed base assembly. The defects are as follows: when the parts are assembled into the walking wheel bracket assembly, the assembly process is relatively complex, and the welding process requirement is relatively high; similarly, the driving shaft and the driven shaft are long, the processing difficulty is high, the assembly process is still complex, and the assembly and disassembly are inconvenient; the test bed base assembly only can walk and brake in a straight line, cannot do steering movement, cannot change speed when walking in the straight line, and is complex to maintain and repair.

Therefore, the automobile air brake valve and brake cylinder test bed hydraulic driving base assembly which is simple and reasonable in structure, easy to maintain and repair, short in preparation time before test, high in working efficiency, capable of achieving hydraulic driving walking, steering and braking capacity, variable-speed walking and steering, convenient to install, safe and reliable to use is researched and is certainly favored by the majority of users.

Disclosure of Invention

The invention aims to provide a hydraulic driving base assembly of an automobile air brake valve and brake cylinder test bed, which has compact and reasonable structure, moderate cost, hydraulic driving speed-changing walking, speed-changing steering and braking capability, convenient installation and reliable use.

In order to realize the task, the invention adopts the following technical solution:

the utility model provides an automobile air brake valve and brake cylinder test bench hydraulic drive base assembly, includes: the hydraulic drive left gear train power assembly, the hydraulic drive right gear train power assembly and the hydraulic drive base device are arranged on the base; the method is characterized in that:

the hydraulic drive left gear train power assembly is connected with a second variable hydraulic pump oil suction pipe assembly in the hydraulic drive right gear train power assembly through a first three-way joint in the hydraulic drive left gear train power assembly; the hydraulic drive left gear train power assembly is connected with a second three-way joint in the hydraulic drive right gear train power assembly through a first hydraulic system oil return pipe assembly in the hydraulic drive left gear train power assembly; the hydraulic driving left gear train power assembly is connected with a cooler oil outlet pipe in the hydraulic driving right gear train power assembly through a hydraulic oil tank assembly in the hydraulic driving left gear train power assembly; the hydraulic drive left gear train power assembly is connected with a test bed hydraulic drive base in the hydraulic drive base device through a hydraulic oil tank assembly; the hydraulic oil tank assembly is in threaded connection with the hydraulic driving base of the test bed; the hydraulic drive left gear train power assembly is in threaded connection with a hydraulic drive base of the test bed through a first variable hydraulic pump support frame in the hydraulic drive left gear train power assembly; the hydraulic drive left gear train power assembly is in threaded connection with a hydraulic drive base of the test bed through a first motor in the hydraulic drive left gear train power assembly; the hydraulic drive left gear train power assembly is in threaded connection with a hydraulic drive base of the test bed through a first variable hydraulic pump integrated block base in the hydraulic drive left gear train power assembly; the hydraulic drive left gear train power assembly is connected with a first high-pressure oil pipe assembly and a third high-pressure oil pipe assembly in the hydraulic drive base device through a first variable hydraulic pump integrated block base; the hydraulic drive right gear train power assembly is in threaded connection with the test bed hydraulic drive base through a second motor in the hydraulic drive right gear train power assembly; the hydraulic drive right gear train power assembly is in threaded connection with a hydraulic drive base of the test bed through a second variable hydraulic pump support frame in the hydraulic drive right gear train power assembly; the hydraulic drive right gear train power assembly is in threaded connection with the hydraulic drive base of the test bed through a second variable hydraulic pump integrated block base in the hydraulic drive right gear train power assembly; the hydraulic drive right gear train power assembly is in threaded connection with a hydraulic drive base of a test bed through an air brake valve performance test bed in the hydraulic drive right gear train power assembly; the hydraulic drive right gear train power assembly is in threaded connection with a test bed hydraulic drive base through an air brake valve reliability and durability test bed in the hydraulic drive right gear train power assembly; the hydraulic drive right gear train power assembly is in threaded connection with a test bed hydraulic drive base through a brake cylinder performance test bed in the hydraulic drive right gear train power assembly; the hydraulic drive right gear train power assembly is in threaded connection with a test bed hydraulic drive base through a test bed for testing the reliability and durability of a brake cylinder in the hydraulic drive right gear train power assembly; the hydraulic drive right-side gear train power assembly is in threaded connection with the hydraulic drive base of the test bed through a cooler assembly in the hydraulic drive right-side gear train power assembly; the hydraulic drive right side gear train power assembly is in threaded connection with the test bed hydraulic drive base through an electrical control cabinet in the hydraulic drive right side gear train power assembly.

According to the invention, the hydraulically driven left side gear train powertrain comprises: the hydraulic control system comprises a first pressure sensor assembly, a first pilot type proportional overflow valve assembly, a first variable hydraulic pump pressure oil pipe assembly, a first variable hydraulic pump, a first end cover, a first variable hydraulic pump support frame, a first flat key, a first lubricating oil injection plug, a first variable hydraulic pump transmission sleeve, a second flat key, a second end cover, a first motor, a first variable hydraulic pump oil suction pipe assembly, a hydraulic oil tank assembly, a first three-way joint, a first variable hydraulic pump integrated block base, a first electro-hydraulic proportional reversing valve, a second one-way proportional speed regulating valve, a first variable hydraulic pump integrated block, a first pressure gauge, a first hydraulic system oil return pipe assembly, a hydraulic oil tank oil suction pipe assembly and a third one-way proportional speed regulating valve; wherein:

the hydraulic oil tank assembly is arranged in the middle of a test bed hydraulic driving base in the hydraulic driving base device; supporting legs at four corners of the hydraulic oil tank assembly are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes in the hydraulic driving base of the test bed; the hydraulic oil tank assembly is in threaded connection with the hydraulic driving base of the test bed; the first motor is arranged on the left side of the front part of the hydraulic drive base of the test bed and is positioned between the first variable hydraulic pump support frame and a second motor in the hydraulic drive right gear train power assembly; the first motor is in threaded connection with the hydraulic driving base of the test bed; the first variable hydraulic pump support frame is formed into a whole by a horizontal cylinder, two vertical plates with the same geometric dimension and the same thickness and two L-shaped plates with the same geometric dimension and the same thickness; a vertical thread through hole is formed in the middle of the upper part of the outer part of a horizontal cylinder in a first variable hydraulic pump support frame; a vertical thread through hole in the middle of the upper part of the outer part of the horizontal cylinder of the first variable hydraulic pump support frame is matched with a thread of the first lubricating oil injection plug; two coaxial cylindrical holes with different diameters are arranged in a horizontal cylinder of a first variable hydraulic pump support frame, wherein the diameter of the cylindrical hole on the left side is smaller than that of the cylindrical hole on the right side; a rectangular groove matched with the first flat key is arranged above a left cylindrical hole in the horizontal cylinder of the first variable hydraulic pump support frame; six horizontal threaded holes are uniformly distributed on the left end surface and the right end surface around the axial leads of two horizontal cylindrical holes of the first variable hydraulic pump support frame; the axial leads of two horizontal cylindrical holes of the first variable hydraulic pump support frame are coaxial with the axial lead of a circle formed by the axial leads of two groups of six horizontal threaded holes at the left end and the right end; six horizontal threaded holes on the left end surface of the horizontal cylinder of the first variable hydraulic pump support frame are matched with six horizontal cylindrical holes on the first end cover; six horizontal threaded holes on the right end face of the horizontal cylinder of the first variable hydraulic pump support frame are matched with six horizontal cylindrical holes on the second end cover; a horizontal cylindrical hole is formed in the middle of the first end cover; the diameter of a horizontal cylindrical hole in the middle of the first end cover is equal to that of a left cylindrical hole of the first variable hydraulic pump support frame; the middle horizontal cylindrical hole of the first end cover is matched with a cylinder of a driving shaft of the first variable hydraulic pump; a horizontal cylindrical hole is arranged in the middle of the second end cover and is matched with the cylinder of the output shaft of the first motor; the outer part of the transmission sleeve of the first variable hydraulic pump is a horizontal cylinder; two cylindrical holes with the same shaft and different diameters are arranged in the horizontal cylinder of the transmission sleeve of the first variable hydraulic pump, wherein the diameter of the cylindrical hole on the left side is smaller than that of the cylindrical hole on the right side; a flat key groove matched with the first flat key is arranged in the cylindrical hole on the left side of the transmission sleeve of the first variable hydraulic pump; a flat key groove matched with the second flat key is arranged in the cylindrical hole on the right side of the transmission sleeve of the first variable hydraulic pump; the axial lead of the horizontal cylinder of the transmission sleeve of the first variable hydraulic pump is coaxial with the axial leads of two cylindrical holes which are coaxial and have different diameters; the first variable hydraulic pump transmission sleeve is arranged in a cylindrical hole on the right side of the first variable hydraulic pump support frame, and the left end of the first variable hydraulic pump transmission sleeve is contacted with the right end of the cylindrical hole on the left side of the first variable hydraulic pump support frame; the second end cover is arranged on the cylinder of the output shaft of the first motor; the second flat key is arranged in the cylindrical flat key groove of the output shaft of the first motor; after the second end cover, the second flat key and the first motor are assembled, the second end cover, the second flat key and the first motor are arranged on the cylinder of the output shaft of the first motor along the second flat key through a flat key groove in a cylindrical hole on the right side of the transmission sleeve of the first variable hydraulic pump; the second end cover is in threaded connection with the first variable hydraulic pump support frame; the first end cover is arranged on the cylinder of the driving shaft of the first variable hydraulic pump; the first flat key is arranged in the flat key groove of the cylinder of the driving shaft of the first variable hydraulic pump; after the first end cover, the first flat key and the first variable hydraulic pump are assembled, the first flat key on the cylinder of the driving shaft of the first variable hydraulic pump is arranged on the support frame of the first variable hydraulic pump along the flat key groove of the support frame and the transmission sleeve of the first variable hydraulic pump; the first variable hydraulic pump connecting plate is in threaded connection with the first variable hydraulic pump supporting frame through a first end cover; the first variable hydraulic pump support frame is in threaded connection with the test bed hydraulic drive base; the oil suction port and the oil pressing port of the first variable hydraulic pump are respectively provided with a pipe joint and are sealed by a sealing ring; the left end of the oil suction pipe assembly of the first variable hydraulic pump is connected with the oil suction pipe joint of the first variable hydraulic pump through a pipe joint; the right end of the oil suction pipe assembly of the first variable hydraulic pump is connected with a pipe joint at the left end of the first three-way joint through a pipe joint; the right end of the first three-way joint is connected with a pipe joint at the left end of a second variable hydraulic pump oil suction pipe assembly in the hydraulic drive right gear train power assembly through a pipe joint; one end of the hydraulic oil tank oil suction pipe assembly is connected with a right end oil suction pipe joint at the lower part in front of the hydraulic oil tank assembly through a pipe joint, and the other end of the hydraulic oil tank oil suction pipe assembly is connected with a rear end pipe joint of the first three-way joint through a pipe joint; the left end of a hydraulic pipe assembly of the first variable hydraulic pump is connected with a pipe joint at the right end of the base of the first variable hydraulic pump manifold block through a pipe joint; the right end of the oil pipe assembly of the first variable hydraulic pump is connected with an oil port pipe joint of the first variable hydraulic pump through a pipe joint; the left front end of the first hydraulic system oil return pipe assembly is connected with a pipe joint at the rear end of the first variable hydraulic pump integrated block base through a pipe joint; the right end of the first hydraulic system oil return pipe assembly is connected with a pipe joint at the left end of a second three-way joint in the hydraulic drive right gear train power assembly through a pipe joint; the base of the first variable hydraulic pump manifold block is a cuboid; a pipe joint is arranged in the middle of the right end of the first variable hydraulic pump integrated block base; the middle pipe joint at the right end of the first variable hydraulic pump manifold block base is matched with the pipe joint at the left end of the first variable hydraulic pump pressure oil pipe assembly; a pipe joint is arranged in the middle of the rear side of the base of the first variable hydraulic pump integrated block; a middle pipe joint behind the first variable hydraulic pump manifold block base is matched with a pipe joint at the front end of the left side of the first hydraulic system oil return pipe assembly; two pipe joints are arranged at the left end of the first variable hydraulic pump integrated block base; the pipe joint in the front of the left end of the first variable hydraulic pump integrated block base is matched with the pipe joint in the right end of the upper side of a first high-pressure oil pipe assembly in the hydraulic drive base device; the pipe joint at the rear left end of the first variable hydraulic pump manifold block base is matched with the pipe joint at the right end of the upper side of a third high-pressure oil pipe assembly in the hydraulic drive base device; a pipe joint at the front side of the left end of the first variable hydraulic pump integrated block base is connected with a pipe joint at the upper right end of the first high-pressure oil pipe assembly; the pipe joint at the rear left end of the first variable hydraulic pump manifold block base is connected with the pipe joint at the right upper end of the third high-pressure oil pipe assembly; four corners of the first variable hydraulic pump manifold block base are respectively provided with a vertical cylindrical hole with the same diameter; the first variable hydraulic pump integrated block is a cuboid; four corners of the first variable hydraulic pump manifold block are respectively provided with a vertical cylindrical hole with the same diameter; four equal-diameter vertical cylindrical holes in four corners of a base of the first variable hydraulic pump manifold block are matched with four equal-diameter vertical cylindrical holes in four corners of the first variable hydraulic pump manifold block; the first variable hydraulic pump integrated block is arranged on the first variable hydraulic pump integrated block base; the lower surface of the first variable hydraulic pump manifold block is in sealing contact with the upper surface of the base of the first variable hydraulic pump manifold block through a sealing ring; the first variable hydraulic pump integrated block, the first variable hydraulic pump integrated block base and a test bed hydraulic driving base in the hydraulic driving base device are in threaded connection; four threaded holes matched with the four cylindrical through holes of the second one-way proportional speed regulating valve are formed in the front of the first variable hydraulic pump integrated block; two oil holes are formed in a square formed by the axial leads of four threaded holes in the front of the first variable hydraulic pump manifold block; the two oil holes in the front of the first variable hydraulic pump manifold block are matched with the two oil holes of the second one-way proportional speed regulating valve; the second one-way proportional speed regulating valve is in sealing contact with the front surface of the first variable hydraulic pump manifold block through a sealing ring; the second one-way proportional speed regulating valve is in threaded connection with the front of the first variable hydraulic pump integrated block; four threaded holes matched with four cylindrical holes of the third one-way proportional speed regulating valve are formed in the back of the first variable hydraulic pump integrated block; two oil holes are formed in a square formed by the axial leads of four threaded holes behind the first variable hydraulic pump manifold block; two oil holes behind the first variable hydraulic pump manifold block are matched with two oil holes of the third one-way proportional speed regulating valve; the third one-way proportional speed regulating valve is in sealing contact with the back of the first variable hydraulic pump manifold block through a sealing ring; the third one-way proportional speed regulating valve is in threaded connection with the rear surface of the first variable hydraulic pump integrated block; the left side surface of the first variable hydraulic pump manifold block is provided with four threaded holes matched with four cylindrical holes of the first electro-hydraulic proportional directional valve; four oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the left side surface of the first variable hydraulic pump manifold block; four oil holes on the left side surface of the first variable hydraulic pump manifold block are matched with four oil holes of the first electro-hydraulic proportional reversing valve; the first electro-hydraulic proportional directional valve is in sealing contact with the left side face of the first variable hydraulic pump manifold block through a sealing ring; the first electro-hydraulic proportional directional valve is in threaded connection with the left side face of the first variable hydraulic pump manifold block; the right side surface of the first variable hydraulic pump manifold block is provided with four threaded holes matched with four cylindrical holes of the first pilot type proportional relief valve assembly; two oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the right side surface of the first variable hydraulic pump manifold block; the two oil holes on the right side surface of the first variable hydraulic pump manifold block are matched with the two oil holes of the first pilot type proportional relief valve assembly; the first pilot type proportional overflow valve assembly is in sealing contact with the right side face of the first variable hydraulic pump manifold block through a sealing ring; the first pilot type proportional overflow valve assembly is in threaded connection with the right side face of the first variable hydraulic pump integrated block sequentially through a bolt, a spring washer and a flat washer; the first pressure sensor assembly is arranged at the right end in the middle of the upper surface of the first variable hydraulic pump integrated block; the first pressure gauge is arranged at the left end in the middle of the upper surface of the first variable hydraulic pump manifold block.

The hydraulic drive right side gear train power assembly comprises: a second motor, a second variable hydraulic pump oil suction pipe assembly, a third end cover, a third flat key, a second variable hydraulic pump transmission sleeve, a second lubricating oil injection plug, a fourth flat key, a second variable hydraulic pump support frame, a fourth end cover, a second variable hydraulic pump oil suction pipe assembly, a second pilot type proportional overflow valve assembly, a second pressure sensor assembly, a second hydraulic system oil return pipe assembly, a second pressure gauge, a second variable hydraulic pump integrated block, a first one-way proportional speed regulating valve, a second electro-hydraulic proportional reversing valve, a second variable hydraulic pump integrated block base, a cooler oil outlet pipe assembly, a cooler oil inlet pipe assembly, a second three-way joint, a fourth one-way proportional speed regulating valve, an air brake valve performance test bed, an air brake valve reliability and durability test bed, a brake cylinder performance test bed, a brake cylinder reliability and durability test bed, The water cooler comprises a cooler water outlet pipe assembly, a cooler water inlet pipe assembly, a cooler assembly and an electrical control cabinet; wherein:

the second motor is arranged on the right side of the front part of a test bed hydraulic driving base in the hydraulic driving base device and is positioned between the second variable hydraulic pump support frame and the first motor in the hydraulic driving left gear train power assembly; the second motor is in threaded connection with the hydraulic driving base of the test bed; the second variable hydraulic pump support frame is formed into a whole by a horizontal cylinder, two vertical plates with the same geometric dimension and the same thickness and two L-shaped plates with the same geometric dimension and the same thickness; a vertical thread through hole is formed in the middle of the upper part of the outer part of a horizontal cylinder in a second variable hydraulic pump support frame; a vertical thread through hole in the middle of the upper part of the outer part of the horizontal cylinder of the second variable hydraulic pump support frame is matched with a thread of a second lubricating oil injection plug; two coaxial cylindrical holes with different diameters are arranged in the horizontal cylinder of the second variable hydraulic pump support frame, wherein the diameter of the left cylindrical hole is larger than that of the right cylindrical hole; a rectangular groove matched with the fourth flat key is formed above the right cylindrical hole in the horizontal cylinder of the second variable hydraulic pump support frame; six horizontal threaded holes are uniformly distributed on the left end surface and the right end surface around the axial leads of two horizontal cylindrical holes of the second variable hydraulic pump support frame; the axial leads of two horizontal cylindrical holes of the second variable hydraulic pump support frame are coaxial with the axial lead of a circle formed by the axial leads of two groups of six horizontal threaded holes at the left end and the right end; six horizontal threaded holes on the left end surface of the horizontal cylinder of the second variable hydraulic pump support frame are matched with six horizontal cylindrical holes on the third end cover; six horizontal threaded holes on the right end face of the horizontal cylinder of the second variable hydraulic pump support frame are matched with six horizontal cylindrical holes on the fourth end cover; a horizontal cylindrical hole is arranged in the middle of the third end cover and is matched with the cylinder of the output shaft of the second motor; a horizontal cylindrical hole is formed in the middle of the fourth end cover and is equal to a cylindrical hole on the right side of the second variable hydraulic pump support frame; the middle horizontal cylindrical hole of the fourth end cover is matched with a cylinder of a driving shaft of the second variable hydraulic pump; the outer part of the transmission sleeve of the second variable hydraulic pump is a horizontal cylinder; two cylindrical holes with the same shaft and different diameters are arranged in the horizontal cylinder of the transmission sleeve of the second variable hydraulic pump, wherein the diameter of the cylindrical hole on the left side is larger than that of the cylindrical hole on the right side; a flat key groove matched with the third flat key is arranged in the cylindrical hole on the left side of the transmission sleeve of the second variable hydraulic pump; a flat key groove matched with the fourth flat key is arranged in the cylindrical hole on the right side of the transmission sleeve of the second variable hydraulic pump; the axial lead of the horizontal cylinder of the transmission sleeve of the second variable hydraulic pump is coaxial with the axial leads of two cylindrical holes which are coaxial and have different diameters; the second variable hydraulic pump transmission sleeve is arranged in a cylindrical hole on the left side of the second variable hydraulic pump support frame, and the right end of the second variable hydraulic pump transmission sleeve is contacted with the left end of the cylindrical hole on the right side of the second variable hydraulic pump support frame; the third end cover is arranged on the cylinder of the output shaft of the second motor; the third flat key is arranged in the cylindrical flat key groove of the output shaft of the second motor; after the third end cover, the third flat key and the second motor are assembled, the third end cover, the third flat key and the second motor are arranged on the cylinder of the output shaft of the second motor along the third flat key through the flat key groove in the cylindrical hole on the left side of the transmission sleeve of the second variable hydraulic pump; the third end cover is in threaded connection with a second variable hydraulic pump support frame; the fourth end cover is arranged on a cylinder of a driving shaft of the second variable hydraulic pump; the fourth flat key is arranged in the flat key groove of the cylinder of the driving shaft of the second variable hydraulic pump; after the fourth end cover, the fourth flat key and the second variable hydraulic pump are assembled, the fourth flat key on the cylinder of the driving shaft of the second variable hydraulic pump is arranged on the support frame of the second variable hydraulic pump along the flat key grooves of the support frame and the transmission sleeve of the second variable hydraulic pump; the second variable hydraulic pump connecting plate is in threaded connection with a second variable hydraulic pump supporting frame through a fourth end cover; the second variable hydraulic pump support frame is in threaded connection with the test bed hydraulic drive base; the oil suction port and the oil pressing port of the second variable hydraulic pump are respectively provided with a pipe joint and are sealed by a sealing ring; the left end of an oil suction pipe assembly of the second variable hydraulic pump is connected with a pipe joint at the right end of a first three-way joint in a power assembly of the hydraulic drive left gear train through a pipe joint; the right end of the oil suction pipe assembly of the second variable hydraulic pump is connected with the oil suction pipe joint of the second variable hydraulic pump through a pipe joint; the left end of a hydraulic oil pipe assembly of the second variable hydraulic pump is connected with a hydraulic oil port pipe joint of the second variable hydraulic pump through a pipe joint; the right end of a pressure oil pipe assembly of the second variable hydraulic pump is connected with a pipe joint at the left end of the second variable hydraulic pump integrated block base through a pipe joint; the left end of the second hydraulic system oil return pipe assembly is connected with a pipe joint at the right end of a second three-way joint through a pipe joint; the front end of the right side of the second hydraulic system oil return pipe assembly is connected with a pipe joint at the rear end of the second variable hydraulic pump integrated block base through a pipe joint; the base of the second variable hydraulic pump integrated block is a cuboid; a pipe joint is arranged in the middle of the left end of the second variable hydraulic pump integrated block base; the middle pipe joint at the left end of the second variable hydraulic pump manifold block base is matched with the right pipe joint of the second variable hydraulic pump pressure oil pipe assembly; a pipe joint is arranged in the middle of the rear side of the base of the second variable hydraulic pump integrated block; the middle pipe joint behind the second variable hydraulic pump integrated block base is matched with the front end of the right side of the second hydraulic system oil return pipe assembly; two pipe joints are arranged at the right end of the second variable hydraulic pump integrated block base; the pipe joint at the front end of the right end of the second variable hydraulic pump manifold block base is matched with the pipe joint at the left end of the upper side of a sixth high-pressure oil pipe assembly in the hydraulic drive base device; the pipe joint at the rear of the right end of the second variable hydraulic pump manifold block base is matched with the pipe joint at the left end of the upper side of a fourth high-pressure oil pipe assembly in the hydraulic drive base device; a pipe joint at the front end of the right end of the second variable hydraulic pump integrated block base is connected with a pipe joint at the left end of the upper edge of the sixth high-pressure oil pipe assembly; a pipe joint at the rear of the right end of the second variable hydraulic pump manifold block base is connected with a pipe joint at the left end of the upper side of a fourth high-pressure oil pipe assembly; four corners of the second variable hydraulic pump manifold block base are respectively provided with a vertical cylindrical hole with the same diameter; the second variable hydraulic pump integrated block is a cuboid; four corners of the second variable hydraulic pump manifold block are respectively provided with a vertical cylindrical hole with the same diameter; four equal-diameter vertical cylindrical holes in four corners of a base of the second variable hydraulic pump manifold block are matched with four equal-diameter vertical cylindrical holes in four corners of the second variable hydraulic pump manifold block; the second variable hydraulic pump integrated block is arranged on the second variable hydraulic pump integrated block base; the lower surface of the second variable hydraulic pump manifold block is in sealing contact with the upper surface of the base of the second variable hydraulic pump manifold block through a sealing ring; the second variable hydraulic pump integrated block and the second variable hydraulic pump integrated block base are in threaded connection with the test bed hydraulic drive base; four threaded holes matched with the four cylindrical through holes of the first one-way proportional speed regulating valve are formed in the front of the second variable hydraulic pump integrated block; two oil holes are formed in a square formed by the axial leads of four threaded holes in front of the second variable hydraulic pump manifold block; the two oil holes in the front of the second variable hydraulic pump manifold block are matched with the two oil holes of the first one-way proportional speed regulating valve; the first one-way proportional speed regulating valve is in sealing contact with the front of the second variable hydraulic pump manifold block through a sealing ring; the first one-way proportional speed regulating valve is in threaded connection with the front of the second variable hydraulic pump integrated block; four threaded holes matched with four cylindrical holes of a fourth one-way proportional speed regulating valve are formed in the back of the second variable hydraulic pump integrated block; two oil holes are formed in a square formed by the axial leads of four threaded holes behind the second variable hydraulic pump manifold block; two oil holes behind the second variable hydraulic pump manifold block are matched with two oil holes of a fourth one-way proportional speed regulating valve (74); the fourth one-way proportional speed regulating valve is in sealing contact with the back of the second variable hydraulic pump integrated block through a sealing ring; the fourth one-way proportional speed regulating valve is in threaded connection with the rear part of the second variable hydraulic pump integrated block (32); the right side surface of the second variable hydraulic pump manifold block is provided with four threaded holes matched with four cylindrical holes of the second electro-hydraulic proportional directional valve; four oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the right side surface of the second variable hydraulic pump manifold block; four oil holes on the right side surface of the second variable hydraulic pump manifold block are matched with four oil holes of the second electro-hydraulic proportional reversing valve; the second electro-hydraulic proportional directional valve is in sealing contact with the right side face of the second variable hydraulic pump manifold block through a sealing ring; the second electro-hydraulic proportional directional valve is in threaded connection with the right side face of the second variable hydraulic pump manifold block; the left side surface of the second variable hydraulic pump manifold block is provided with four threaded holes matched with four cylindrical holes of the second pilot type proportional relief valve assembly; two oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the left side surface of the second variable hydraulic pump manifold block; the two oil holes on the left side surface of the second variable hydraulic pump manifold block are matched with the two oil holes of the second pilot type proportional relief valve assembly; the second pilot-operated proportional overflow valve assembly is in sealing contact with the left side surface of the second variable hydraulic pump integrated block through a sealing ring; the second pilot type proportional overflow valve assembly is in threaded connection with the left side face of the second variable hydraulic pump integrated block; the second pressure sensor assembly is arranged at the left end in the middle of the upper surface of the second variable hydraulic pump integrated block; the second pressure gauge is arranged at the right end in the middle of the upper surface of the second variable hydraulic pump manifold block; the air brake valve performance test bed is arranged at the left end of the rear part of the test bed hydraulic drive base; four corners of the air brake valve performance test bed are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the hydraulic drive base of the test bed; the air brake valve performance test bed is in threaded connection with the test bed hydraulic drive base; the air brake valve reliability and durability test bed is arranged at the rear part of the hydraulic drive base of the test bed, is positioned at the right side of the air brake valve performance test bed and is positioned at the left side of the brake cylinder performance test bed; four corners of the air brake valve reliability and durability test bed are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the test bed hydraulic driving base; the air brake valve reliability and durability test bed is in threaded connection with the test bed hydraulic drive base; the brake cylinder performance test bed is arranged at the rear part of the hydraulic drive base of the test bed, is positioned at the right side of the pneumatic brake valve reliability and durability test bed and is positioned at the left side of the brake cylinder reliability and durability test bed; four corners of the brake cylinder performance test bed are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the hydraulic drive base of the test bed; the brake cylinder performance test bed is in threaded connection with a test bed hydraulic driving base; the brake cylinder reliability and durability test bed is arranged at the right end of the rear part of the test bed hydraulic drive base; four corners of the test bed for the reliability and the durability of the brake cylinder are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on a hydraulic driving base of the test bed; the brake cylinder reliability and durability test bed is in threaded connection with the test bed hydraulic drive base; the cooler assembly is arranged at the right end of the middle part of the hydraulic driving base of the test bed; four equal-diameter cylindrical holes of the cooler assembly are matched with four equal-diameter threaded holes on a hydraulic driving base of the test bed; the cooler assembly is in threaded connection with the hydraulic driving base of the test bed; the front end of the cooler oil inlet pipe assembly is connected with a pipe joint at the rear end of the second three-way joint through a pipe joint; the rear end of the cooler oil inlet pipe assembly is connected with an oil inlet pipe joint of the cooler assembly through a pipe joint; the right end of the cooler oil outlet pipe assembly is connected with an oil outlet pipe joint of the cooler assembly through a pipe joint; the left end of the cooler oil outlet pipe assembly is connected with an oil return pipe joint at the back of a hydraulic oil tank assembly in a hydraulic drive left gear train power assembly through a pipe joint; the left end of the cooler water outlet pipe assembly is connected with a pipe joint of a water outlet of the cooler assembly through a pipe joint; the right end of the cooler water outlet pipe assembly is connected with a cooling water return pipe joint through a pipe joint; the left end of the cooler water inlet pipe assembly is connected with a pipe joint of a water inlet of the cooler assembly through a pipe joint; the right end of the cooler water inlet pipe assembly is connected with a cooling water source pipe joint through a pipe joint; the electrical control cabinet is arranged at the left end of the middle part of the hydraulic driving base of the test bed; four corners of the electrical control cabinet are respectively provided with an equal-diameter cylindrical hole matched with the four equal-diameter threaded holes on the hydraulic driving base of the test bed; the electrical control cabinet is in threaded connection with the test bed hydraulic drive base through a bolt, a spring washer and a flat washer in sequence.

The hydraulic drive base device includes: a first travelling wheel bracket, a third lubricating oil injection plug, a first hydraulic motor, a first bush, a first travelling wheel shaft, a first travelling wheel, a first fixed snap ring, a second bush, a fourth lubricating oil injection plug, a test bench hydraulic drive base, a second travelling wheel bracket, a fifth lubricating oil injection plug, a third bush, a second fixed snap ring, a second travelling wheel shaft, a fourth bush, a second hydraulic motor, a sixth lubricating oil injection plug, a first high-pressure oil pipe assembly, a second high-pressure oil pipe assembly, a third high-pressure oil pipe assembly, a fourth high-pressure oil pipe assembly, a fifth high-pressure oil pipe assembly, a sixth high-pressure oil pipe assembly, a seventh lubricating oil injection plug, a third hydraulic motor, a fifth bush, a third travelling wheel shaft, a third travelling wheel, a third fixed snap ring, a sixth bush, an eighth lubricating oil injection plug, a third travelling wheel bracket, a ninth lubricating oil injection plug, a fifth travelling wheel bracket, The fourth traveling wheel bracket is connected with the fourth fixed snap ring through a fourth bushing, a fourth traveling wheel shaft, a seventh bushing, a fourth hydraulic motor, a tenth lubricating oil injection plug and a fourth traveling wheel bracket; wherein:

the test bed hydraulic driving base is a rectangular steel plate with equal thickness; the left end of the rear part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of the air brake valve performance test bed in the hydraulic drive right gear train power assembly; the left side of the rear part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of the test bed for the reliability and durability of an air brake valve in a hydraulic drive right gear train power assembly; the right side of the rear part of the upper surface of the hydraulic driving base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a brake cylinder performance test bed base in a hydraulic driving right-side gear train power assembly; the right end of the rear part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of the test bed for reliability and durability of a brake cylinder in a hydraulic drive right gear train power assembly; the middle part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a hydraulic oil tank assembly base in a hydraulic drive left gear train power assembly; the right end of the middle part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a cooler assembly base in a hydraulic drive right gear train power assembly; the left end of the middle part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of an electrical control cabinet in the hydraulic drive right gear train power assembly; the left end of the front part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with a first variable hydraulic pump integrated block base in a hydraulic drive left gear train power assembly and four equal-diameter cylindrical holes on a first variable hydraulic pump integrated block; four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in a first variable hydraulic pump support frame in a hydraulic drive left gear train power assembly are formed in the left side of the front part of the upper surface of the hydraulic drive base of the test bed; four kidney holes matched with four equal-diameter cylindrical holes in a first motor base in a hydraulic drive left gear train power assembly are formed in the left side of the front part of the upper surface of the hydraulic drive base of the test bed; four kidney holes matched with four equal-diameter cylindrical holes in a second motor base in a hydraulic drive right gear train power assembly are formed in the right side of the front part of the upper surface of the hydraulic drive base of the test bed; four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in a second variable hydraulic pump support frame in a hydraulic drive right gear train power assembly are formed in the right side of the front part of the upper surface of the hydraulic drive base of the test bed; the right end of the front part of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with a second variable hydraulic pump integrated block in a hydraulic drive right gear train power assembly and four equal-diameter cylindrical holes on the base of the second variable hydraulic pump integrated block; the right front corner of the upper surface of the hydraulic driving base of the test bed is provided with four equal-diameter threaded holes matched with the four equal-diameter cylindrical holes on the first travelling wheel bracket; a round counter bore matched with a cylinder at the upper end of the first travelling wheel bracket is arranged at the right front corner of the lower surface of the hydraulic drive base of the test bed; the left front corner of the upper surface of the hydraulic drive base of the test bed is provided with four equal-diameter threaded holes matched with the four equal-diameter cylindrical holes on the second travelling wheel support; a round counter bore matched with a cylinder at the upper end of the second travelling wheel support is arranged at the left front corner of the lower surface of the hydraulic drive base of the test bed; the left rear corner of the upper surface of the hydraulic driving base of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the third travelling wheel bracket; a round counter bore matched with a cylinder at the upper end of the third travelling wheel bracket is arranged at the left rear corner of the lower surface of the hydraulic drive base of the test bed; the right rear angle of the upper surface of the test bed hydraulic drive base is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the fourth traveling wheel bracket; the right rear corner of the lower surface of the test bed hydraulic drive base is provided with a round counter bore matched with the cylinder at the upper end of the fourth traveling wheel bracket; the first travelling wheel bracket is composed of a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimension, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimension, and the lower ends of the isosceles trapezoid steel plates are integrated by adopting a vertical plate with arc transition; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in a hydraulic driving base of the test bed are uniformly distributed in the round steel plate of the first travelling wheel bracket; a horizontal cylindrical hole matched with the cylinder of the first bushing and the cylinder of the second bushing is respectively arranged on a boss at the lower part of the vertical plate of which the two parallel lower ends of the first travelling wheel bracket adopt arc transition; the axial lead of bosses at the lower parts of two parallel vertical plates of the first travelling wheel bracket is coaxial with the axial leads of the two horizontal cylindrical holes; the horizontal cylindrical hole at the lower part of the left vertical plate of the first travelling wheel bracket is matched with the second lining cylinder; a horizontal cylindrical hole at the lower part of the vertical plate on the right of the first travelling wheel bracket is matched with the first lining cylinder; a vertical threaded hole matched with the thread of the fourth lubricating oil injection plug cylinder is formed in a boss on the left side surface of the lower part of the left vertical plate of the first travelling wheel bracket; a boss at the lower part of the vertical plate on the right side of the first travelling wheel bracket is provided with a vertical threaded hole matched with the thread of the third lubricating oil injection plug cylinder; six horizontal threaded holes matched with the six horizontal cylindrical holes in the first hydraulic motor connecting plate are formed in a boss on the right side face of the lower part of the vertical plate on the right side of the first travelling wheel bracket; the axis of a horizontal cylindrical hole on a boss on the right side surface of the lower part of the right vertical plate of the first travelling wheel bracket is coaxial with the axis of a circle formed by the axes of the six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the first bushing; the right vertical cylindrical hole of the first bushing is matched with a vertical threaded hole in a boss at the lower part of a vertical plate at the right of the first travelling wheel bracket; the first bushing is arranged in a boss upper cylindrical hole at the lower part of a vertical plate at the right side of the first travelling wheel bracket; a vertical cylindrical hole is formed in the left side of the second bushing; the left vertical cylindrical hole of the second bushing is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the first travelling wheel bracket; the second bushing is arranged in a cylindrical hole on a boss at the lower part of the left vertical plate of the first travelling wheel bracket; a cylindrical hole internal spline matched with the cylindrical spline of the first travelling wheel shaft is arranged on the horizontal axis of the first travelling wheel; three cylinders with coaxial different diameters are arranged outside the first travelling wheel shaft, wherein the diameter of the left cylinder is larger than that of the middle cylinder, and the diameter of the middle cylinder is larger than that of the right cylinder; a spline is arranged on the middle cylinder of the first travelling wheel shaft; an internal spline is arranged inside the cylinder on the right side of the first travelling wheel shaft; the axis of a spline in the cylindrical hole on the right side of the first travelling wheel shaft is coaxial with the axis of a spline on the middle cylinder; a circular groove matched with the first fixed snap ring is formed in the left side of the spline of the middle cylinder of the first travelling wheel shaft; the right end of the first travelling wheel shaft penetrates through the second bushing, the first fixed snap ring and the first travelling wheel in sequence, and the right end of the first travelling wheel shaft extends out of the first bushing; the first fixed snap ring is arranged in the circular groove of the first travelling wheel shaft, and the left end of the first fixed snap ring is contacted with the right end of the lower part of the left vertical plate of the first travelling wheel bracket; the right end of the left cylinder of the first travelling wheel shaft is contacted with the left end of the lower part of the left vertical plate of the first travelling wheel bracket; the first travelling wheel is arranged on a cylindrical spline in the middle of the first travelling wheel shaft; the fourth lubricating oil injection plug is arranged in a vertical threaded hole on a boss on the left side surface of the lower part of the left vertical plate of the first travelling wheel bracket; the third lubricating oil injection plug is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right of the first travelling wheel bracket; the output shaft of the first hydraulic motor is inserted into the spline of the cylindrical hole on the right side of the first travelling wheel shaft; the left end of the first hydraulic motor connecting plate is contacted with the right end of the lower part of the vertical plate on the right side of the first travelling wheel bracket; the first hydraulic motor connecting plate is in threaded connection with the right end of the lower part of the vertical plate on the right side of the first travelling wheel support; the circular steel plate of the first travelling wheel bracket is in threaded connection with the lower surface of the right front corner of the hydraulic drive base of the test bed; a pipe joint at the lower right end of the sixth high-pressure oil pipe assembly is connected with a pipe joint at the left end of the first hydraulic motor; an upper pipe joint of the sixth high-pressure oil pipe assembly is connected with a front pipe joint at the right end of a second variable hydraulic pump integrated block base in the hydraulic drive right gear train power assembly; a pipe joint at the left end of the fifth high-pressure oil pipe assembly is connected with a pipe joint at the right end of the first hydraulic motor; the right end pipe joint of the fifth high-pressure oil pipe assembly is connected with the left end pipe joint of the fourth hydraulic motor; the second walking wheel bracket is composed of a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimension, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimension, and the lower ends of the isosceles trapezoid steel plates are integrated by adopting a vertical plate in circular arc transition; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in the hydraulic driving base of the test bed are uniformly distributed in the round steel plate of the second travelling wheel support; a horizontal cylindrical hole matched with a third bush cylinder and a fourth bush cylinder is respectively formed in bosses at the lower parts of two parallel vertical plates of the second travelling wheel bracket, wherein the lower ends of the two parallel vertical plates are in arc transition; the axial lines of bosses at the lower parts of two parallel vertical plates of the second travelling wheel bracket are coaxial with the axial lines of the two horizontal cylindrical holes; the horizontal cylindrical hole at the lower part of the left vertical plate of the second travelling wheel bracket is matched with the fourth lining cylinder; a horizontal cylindrical hole at the lower part of the vertical plate on the right of the second travelling wheel bracket is matched with the third lining cylinder; a vertical threaded hole matched with the thread of the sixth lubricating oil injection plug cylinder is formed in a boss on the left side surface of the lower part of the left vertical plate of the second travelling wheel support; a boss at the lower part of a vertical plate on the right side of the second travelling wheel bracket is provided with a vertical threaded hole matched with the thread of the fifth lubricating oil injection plug cylinder; six horizontal threaded holes matched with six horizontal cylindrical holes in a second hydraulic motor connecting plate are formed in a boss on the left side face of the lower part of a left vertical plate of the second travelling wheel bracket; the axis of a horizontal cylindrical hole on a left side boss at the lower part of a left vertical plate of the second travelling wheel bracket is coaxial with the axis of a circle formed by the axes of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the third bushing; the right vertical cylindrical hole of the third bushing is matched with a vertical threaded hole in a boss at the lower part of a vertical plate at the right of the second travelling wheel bracket; the third bush is arranged in a boss upper cylindrical hole at the lower part of the vertical plate at the right side of the second travelling wheel bracket; a vertical cylindrical hole is formed in the left side of the fourth bushing; the left vertical cylindrical hole of the fourth bush is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the second travelling wheel bracket; the fourth bush is arranged in a cylindrical hole on a boss at the lower part of the left vertical plate of the second travelling wheel bracket; a cylindrical hole internal spline matched with the cylindrical spline of the second travelling wheel shaft is arranged on the horizontal axis of the second travelling wheel; three cylinders with coaxial different diameters are arranged outside the second walking wheel shaft, wherein the diameter of the left cylinder is smaller than that of the middle cylinder, and the diameter of the middle cylinder is smaller than that of the right cylinder; a spline is arranged on the middle cylinder of the second travelling wheel shaft; an internal spline is arranged inside the cylinder on the left side of the second travelling wheel shaft; the axial lead of a spline in the cylindrical hole on the left side of the second walking wheel shaft is coaxial with the axial lead of a spline shaft on the middle cylinder; a circular groove matched with the second fixing snap ring is formed in the right side of the spline of the middle cylinder of the second travelling wheel shaft; the left end of the second travelling wheel shaft penetrates through the third bushing, the second fixed clamping ring and the second travelling wheel in sequence, and the left end of the second travelling wheel shaft extends out of the fourth bushing; the second fixed clamp ring is arranged in the circular groove of the second travelling wheel shaft, and the right end of the second fixed clamp ring is in contact with the left end of the lower part of the vertical plate on the right side of the second travelling wheel support; the left end of the cylinder on the right of the second travelling wheel shaft is in contact with the right end of the lower part of the vertical plate on the right of the second travelling wheel bracket; the second travelling wheel is arranged on a cylindrical spline in the middle of the second travelling wheel shaft; the sixth lubricating oil injection plug is arranged in a vertical threaded hole on a boss on the left side surface of the lower part of the left vertical plate of the second travelling wheel bracket; a fifth lubricating oil injection plug is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the second travelling wheel support; the output shaft of the second hydraulic motor is inserted into the left cylindrical spline of the second walking wheel shaft; the right end of a second hydraulic motor connecting plate is contacted with the left end of the lower part of a left vertical plate of a second travelling wheel support; the second hydraulic motor connecting plate is in threaded connection with the left end of the lower part of the left vertical plate of the second travelling wheel support; the round steel plate of the second walking wheel support is in threaded connection with the lower surface of the left front corner of the hydraulic drive base of the test bed; the left end pipe joint at the lower side of the first high-pressure oil pipe assembly is connected with the right end pipe joint of the second hydraulic motor; an upper pipe joint of the first high-pressure oil pipe assembly is connected with a front pipe joint at the left end of a first variable hydraulic pump integrated block base in a hydraulic drive left gear train power assembly; the right end pipe joint of the second high-pressure oil pipe assembly is connected with the left end pipe joint of the second hydraulic motor; the left end pipe joint of the second high-pressure oil pipe assembly is connected with the right end pipe joint of the third hydraulic motor; the third travelling wheel bracket is composed of a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimension, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimension, and the lower ends of the isosceles trapezoid steel plates are integrated by adopting a vertical plate with arc transition; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in a hydraulic driving base of the test bed are uniformly distributed in the circular steel plate of the third travelling wheel bracket; a horizontal cylindrical hole matched with the cylinder of the fifth bush and the cylinder of the sixth bush is respectively arranged on a boss at the lower part of the vertical plate of which the two parallel lower ends of the third travelling wheel bracket adopt arc transition; the axial lines of bosses at the lower parts of two parallel vertical plates of the third travelling wheel bracket are coaxial with the axial lines of the two horizontal cylindrical holes; a horizontal cylindrical hole at the lower part of the left vertical plate of the third travelling wheel bracket is matched with the sixth lining cylinder; a horizontal cylindrical hole at the lower part of the vertical plate on the right of the third travelling wheel bracket is matched with the fifth lining cylinder; a vertical threaded hole matched with the thread of the eighth lubricating oil injection plug cylinder is formed in a boss on the left side surface of the lower part of the left vertical plate of the third travelling wheel bracket; a boss at the lower part of the vertical plate at the right side of the third travelling wheel bracket is provided with a vertical threaded hole matched with the thread of the plug cylinder filled with seventh lubricating oil; six horizontal threaded holes matched with the six horizontal cylindrical holes in the third hydraulic motor connecting plate are formed in a boss on the right side face of the lower part of the vertical plate on the right side of the third travelling wheel bracket; the axial lead of a horizontal cylindrical hole on a boss on the right side surface of the lower part of a vertical plate on the right side of the third travelling wheel bracket is coaxial with the axial lead of a circle formed by the axial leads of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the fifth bushing; the right vertical cylindrical hole of the fifth bush is matched with a vertical threaded hole in a boss at the lower part of a vertical plate at the right of the third travelling wheel bracket; the fifth bush is arranged in a boss upper cylindrical hole at the lower part of the vertical plate at the right side of the third travelling wheel bracket; a vertical cylindrical hole is formed in the left side of the sixth bushing; the left vertical cylindrical hole of the sixth bushing is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the third travelling wheel bracket; the sixth bushing is arranged in a cylindrical hole on a boss at the lower part of the left vertical plate of the third travelling wheel bracket; a cylindrical hole internal spline matched with the cylindrical spline of the third travelling wheel shaft is arranged on the horizontal axis of the third travelling wheel; three cylinders with coaxial different diameters are arranged outside the third travelling wheel shaft, wherein the diameter of the left cylinder is larger than that of the middle cylinder, and the diameter of the middle cylinder is larger than that of the right cylinder; a spline is arranged on the middle cylinder of the third travelling wheel shaft; an internal spline is arranged inside the cylinder on the right side of the third travelling wheel shaft; the axial lead of a spline in the cylindrical hole on the right side of the third travelling wheel shaft is coaxial with the axial lead of a spline on the middle cylinder; a circular groove matched with the third fixed snap ring is formed in the left side of the spline of the middle cylinder of the third travelling wheel shaft; the right end of the third travelling wheel shaft penetrates through the sixth bushing, the third fixed snap ring and the third travelling wheel in sequence, and the right end of the third travelling wheel shaft extends out of the fifth bushing; the third fixed snap ring is arranged in a circular groove of the third travelling wheel shaft, and the left end of the third fixed snap ring is contacted with the right end of the lower part of the left vertical plate of the third travelling wheel bracket; the right end of the left cylinder of the third travelling wheel shaft is contacted with the left end of the lower part of the left vertical plate of the third travelling wheel bracket; the third travelling wheel is arranged on a cylindrical spline in the middle of the third travelling wheel shaft; the eighth lubricating oil injection plug is arranged in a vertical threaded hole on a boss on the left side surface of the lower part of the left vertical plate of the third travelling wheel bracket; the seventh lubricating oil injection plug is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the third travelling wheel bracket; the output shaft of the third hydraulic motor is inserted into the right cylindrical spline of the third travelling wheel shaft; the left end of the third hydraulic motor connecting plate is contacted with the right end of the lower part of the vertical plate on the right side of the third travelling wheel bracket; a third hydraulic motor connecting plate is in threaded connection with the right end of the lower part of a vertical plate on the right side of the third travelling wheel support; the third traveling wheel bracket round steel plate is in threaded connection with the lower surface of the left rear corner of the test bed hydraulic driving base through a bolt, a spring washer and a flat washer in sequence; the lower right end pipe joint of the third high-pressure oil pipe assembly is connected with the left end pipe joint of the third hydraulic motor; an upper pipe joint of a third high-pressure oil pipe assembly is connected with a rear pipe joint at the left end of a first variable hydraulic pump integrated block base in a hydraulic drive left gear train power assembly; the left end pipe joint of the second high-pressure oil pipe assembly is connected with the right end pipe joint of the third hydraulic motor; the right end pipe joint of the second high-pressure oil pipe assembly is connected with the left end pipe joint of the second hydraulic motor; the fourth traveling wheel bracket consists of a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimension, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimension, and the lower ends of the isosceles trapezoid steel plates form a whole by adopting a vertical plate with arc transition; four equal-diameter cylindrical holes matched with the four equal-diameter threaded holes in the hydraulic driving base of the test bed are uniformly distributed in the circular steel plate of the fourth traveling wheel support; a horizontal cylindrical hole matched with a seventh bushing and an eighth bushing cylinder is respectively formed in a boss at the lower part of the vertical plate, of which the two parallel lower ends of the fourth traveling wheel bracket are in arc transition; the axial lines of bosses at the lower parts of two parallel vertical plates of the fourth travelling wheel bracket are coaxial with the axial lines of the two horizontal cylindrical holes; the horizontal cylindrical hole at the lower part of the left vertical plate of the fourth traveling wheel bracket is matched with the eighth lining cylinder; a horizontal cylindrical hole at the lower part of the right vertical plate of the fourth traveling wheel bracket is matched with the seventh lining cylinder; a vertical threaded hole matched with the thread of the plug cylinder filled with the tenth lubricating oil is formed in a boss on the left side surface of the lower part of the left vertical plate of the fourth travelling wheel bracket; a boss at the lower part of the vertical plate on the right side of the fourth travelling wheel bracket is provided with a vertical threaded hole matched with the thread of the ninth lubricating oil injection plug cylinder; six horizontal threaded holes matched with the six horizontal cylindrical holes in the fourth hydraulic motor connecting plate are formed in a boss on the left side face of the lower portion of the fourth traveling wheel support vertical plate; the axial lead of a horizontal cylindrical hole on a left side boss at the lower part of a left vertical plate of the fourth travelling wheel bracket is coaxial with the axial lead of a circle formed by the axial leads of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the seventh bushing; the right vertical cylindrical hole of the seventh bushing is matched with a vertical threaded hole on a boss at the lower part of a vertical plate at the right of the fourth travelling wheel bracket; the seventh bushing is arranged in a boss upper cylindrical hole at the lower part of the vertical plate on the right of the fourth travelling wheel bracket; a vertical cylindrical hole is formed in the left side of the eighth bushing; the left vertical cylindrical hole of the eighth bushing is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the fourth travelling wheel bracket; the eighth bushing is arranged in a cylindrical hole on a boss at the lower part of the left vertical plate of the fourth travelling wheel bracket; a cylindrical hole internal spline matched with the cylindrical spline of the fourth travelling wheel shaft is arranged on the horizontal axis of the fourth travelling wheel; three cylinders with coaxial different diameters are arranged outside the fourth traveling wheel shaft, wherein the diameter of the left cylinder is smaller than that of the middle cylinder, and the diameter of the middle cylinder is smaller than that of the right cylinder; a spline is arranged on the middle cylinder of the fourth traveling wheel shaft; an internal spline is arranged inside the cylinder on the left side of the fourth traveling wheel shaft; the axial lead of a spline in the cylindrical hole on the left side of the fourth traveling wheel shaft is coaxial with the axial lead of the spline on the middle cylinder; a circular groove matched with the fourth fixed snap ring is formed in the right side of the spline of the middle cylinder of the fourth traveling wheel shaft; the left end of a fourth travelling wheel shaft penetrates through a seventh bushing, a fourth fixed snap ring and a fourth travelling wheel in sequence, and the left end of the fourth travelling wheel shaft extends out of an eighth bushing; a fourth fixed snap ring is arranged in a circular groove of a fourth travelling wheel shaft, and the right end of the fourth fixed snap ring is in contact with the left end of the lower part of a right vertical plate of a fourth travelling wheel bracket; the left end of the cylinder on the right of the fourth travelling wheel shaft is contacted with the right end of the lower part of the vertical plate on the right of the fourth travelling wheel bracket; the fourth traveling wheel is arranged on a cylindrical spline in the middle of the fourth traveling wheel shaft; the tenth lubricating oil injection plug is arranged in a vertical threaded hole on a boss on the left side surface of the lower part of the left vertical plate of the fourth travelling wheel bracket; the ninth lubricating oil injection plug is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the fourth travelling wheel bracket; the output shaft of the fourth hydraulic motor is inserted into the cylindrical spline on the left side of the fourth traveling wheel shaft; the right end of a connecting plate of a fourth hydraulic motor is contacted with the left end of the lower part of a left vertical plate of a fourth travelling wheel bracket; the fourth hydraulic motor connecting plate is in threaded connection with the left end of the lower part of the left vertical plate of the fourth travelling wheel support through a bolt, a spring washer and a flat washer in sequence; the fourth traveling wheel bracket circular steel plate is in threaded connection with the lower surface of the right rear corner of the test bed hydraulic drive base through a bolt, a spring washer and a flat washer in sequence; a left end pipe joint at the lower side of the fourth high-pressure oil pipe assembly is connected with a right end pipe joint of a fourth hydraulic motor; an upper pipe joint of the fourth high-pressure oil pipe assembly is connected with a rear pipe joint at the right end of a second variable hydraulic pump integrated block base in the hydraulic drive right gear train power assembly; the right end pipe joint of the fifth high-pressure oil pipe assembly is connected with the left end pipe joint of the fourth hydraulic motor; and the left end pipe joint of the fifth high-pressure oil pipe assembly is connected with the right end pipe joint of the first hydraulic motor.

The hydraulic drive base assembly of the automobile air brake valve and brake cylinder test bed has the following positive effects: the hydraulic drive base assembly of the automobile air brake valve and the brake cylinder test bed has the advantages of moderate cost, reasonable structure, flexible hydraulic drive variable speed walking, variable speed steering and braking capacity, good strength and rigidity, short test preparation time, convenience in maintenance and service, high working efficiency, convenience in installation, and capability of well ensuring the variable speed walking, variable speed steering and braking flexibility of the hydraulic drive base assembly of the automobile air brake valve and the brake cylinder test bed during maintenance, service and service, the maintenance efficiency of test operators on the test bed is improved, the service life of the automobile air brake valve and the brake cylinder test bed is prolonged, the labor intensity of the test operators is reduced, the test preparation time is shortened, the working efficiency of the test operators is improved, and the test performance of the automobile air brake valve and the brake cylinder test bed is ensured.

Drawings

FIG. 1 is a schematic front view of a hydraulic drive base assembly of an automotive air brake valve and brake cylinder test stand in accordance with the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a right side view of FIG. 1;

fig. 5 is a rear view of fig. 1.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

As shown in fig. 1 to 5, the present embodiment provides a hydraulic drive base assembly of an automobile air brake valve and brake cylinder test bed, which mainly comprises a hydraulic drive left-side gear train power assembly 1, a first pressure sensor assembly 2, a first pilot-operated proportional relief valve assembly 3, a first variable hydraulic pump pressure oil pipe assembly 4, a first variable hydraulic pump 5, a first end cap 6, a first variable hydraulic pump support frame 7, a first flat key 8, a first grease injection plug 9, a first variable hydraulic pump transmission sleeve 10, a second flat key 11, a second end cap 12, a first motor 13, a first variable hydraulic pump oil suction pipe assembly 14, a hydraulic oil tank assembly 15, a first three-way joint 16, a second motor 17, a second variable hydraulic pump oil suction pipe assembly 18, a third end cap 19, a third flat key 20, a second variable hydraulic pump transmission sleeve 21, a second grease injection plug 22, a fourth flat key 23, a left-side gear train power assembly 2, a first pilot-operated proportional relief valve assembly 3, a first variable hydraulic pump oil suction pipe assembly 10, a second flat key 11, a second end cap 12, a third flat key 23, a third flat key, a third variable hydraulic pump, a third flat key, a third variable hydraulic pump, a third variable hydraulic, A second variable hydraulic pump support frame 24, a fourth end cover 25, a second variable hydraulic pump 26, a second variable hydraulic pump pressure oil pipe assembly 27, a second pilot type proportional relief valve assembly 28, a second pressure sensor assembly 29, a second hydraulic system oil return pipe assembly 30, a second pressure gauge 31, a second variable hydraulic pump manifold block 32, a first one-way proportional speed regulating valve 33, a second electro-hydraulic proportional reversing valve 34, a second variable hydraulic pump manifold block base 35, a hydraulic drive right-side gear train power assembly 36, a first traveling wheel bracket 37, a third lubricating oil injection plug 38, a first hydraulic motor 39, a first bush 40, a first traveling wheel shaft 41, a first traveling wheel 42, a first fixed snap ring 43, a second bush 44, a fourth lubricating oil injection plug 45, a hydraulic drive base device 46, a test bench hydraulic drive base 47, a second traveling wheel bracket 48, a fifth lubricating oil injection plug 49, a second hydraulic pump support frame 28, a second pressure pump assembly 28, a second pressure sensor assembly 29, a second hydraulic system oil return pipe assembly 30, a second hydraulic pump manifold block 32, a second hydraulic pump assembly 36, a hydraulic pump assembly, a hydraulic pump assembly, a hydraulic pump assembly, a pump, A third bush 50, a second fixed snap ring 51, a second road wheel 52, a second road wheel shaft 53, a fourth bush 54, a second hydraulic motor 55, a sixth lubricating oil filling plug 56, a first variable hydraulic pump integrated block base 57, a first electro-hydraulic proportional directional valve 58, a second one-way proportional speed control valve 59, a first variable hydraulic pump integrated block 60, a first pressure gauge 61, a first hydraulic system oil return pipe assembly 62, a cooler oil outlet pipe assembly 63, a hydraulic oil tank oil suction pipe assembly 64, a cooler oil inlet pipe assembly 65, a second three-way joint 66, a third one-way proportional speed control valve 67, a first high-pressure oil pipe assembly 68, a second high-pressure oil pipe assembly 69, a third high-pressure oil pipe assembly 70, a fourth high-pressure oil pipe assembly 71, a fifth high-pressure oil pipe assembly 72, a sixth high-pressure oil pipe assembly 73, a fourth one-way proportional speed control valve 74, an air brake valve performance test bench 75, an air brake valve reliability and durability test bench 76, a second high-pressure oil pipe assembly 70, a fourth high-pressure oil pipe assembly 71, a fifth high-pressure oil pipe assembly 72, a fifth high-pressure oil-pressure oil-, The brake cylinder performance test bed 77, the brake cylinder reliability and durability test bed 78, the cooler water outlet pipe assembly 79, the cooler water inlet pipe assembly 80, the cooler assembly 81, the electrical control cabinet 82, the seventh lubricating oil plug 83, the third hydraulic motor 84, the fifth bush 85, the third travelling wheel shaft 86, the third travelling wheel 87, the third fixed snap ring 88, the sixth bush 89, the eighth lubricating oil plug 90, the third travelling wheel bracket 91, the ninth lubricating oil plug 92, the seventh bush 93, the fourth fixed snap ring 94, the fourth travelling wheel 95, the fourth travelling wheel shaft 96, the eighth bush 97, the fourth hydraulic motor 98, the tenth lubricating oil plug 99 and the fourth travelling wheel bracket 100.

The hydraulic drive left gear train power assembly 1 is connected with a second variable hydraulic pump oil suction pipe assembly 18 in a hydraulic drive right gear train power assembly 36 through a first three-way joint 16 in the hydraulic drive left gear train power assembly 1; the hydraulic drive left gear train power assembly 1 is connected with a second three-way joint 66 in the hydraulic drive right gear train power assembly 36 through a first hydraulic system oil return pipe assembly 62 in the hydraulic drive left gear train power assembly 1; the hydraulic drive left gear train power assembly 1 is connected with a cooler oil outlet pipe 63 in the hydraulic drive right gear train power assembly 36 through a hydraulic oil tank assembly 15 in the hydraulic drive left gear train power assembly 1; the hydraulic drive left wheel train power assembly 1 is connected with a test bed hydraulic drive base 47 in a hydraulic drive base device 46 through a hydraulic oil tank assembly 15; the hydraulic oil tank assembly 15 is in threaded connection with the test bed hydraulic driving base 47 sequentially through bolts, spring washers and flat washers; the hydraulic drive left wheel train power assembly 1 is in threaded connection with a test bed hydraulic drive base 47 through a bolt, a spring washer and a flat washer in sequence through a first variable displacement hydraulic pump support frame 7 in the hydraulic drive left wheel train power assembly 1; the hydraulic drive left gear train power assembly 1 is in threaded connection with a test bed hydraulic drive base 47 through a first motor 13 in the hydraulic drive left gear train power assembly 1 sequentially through a bolt, a spring washer, a flat washer and a nut; the hydraulic drive left gear train power assembly 1 is in threaded connection with the test bed hydraulic drive base 47 through a bolt, a spring washer and a flat washer sequentially through a first variable hydraulic pump integrated block base 57 in the hydraulic drive left gear train power assembly 1; the hydraulic drive left gear train power assembly 1 is connected with a first high-pressure oil pipe assembly 68 and a third high-pressure oil pipe assembly 70 in the hydraulic drive base device 46 through a first variable hydraulic pump integrated block base 57; the hydraulic drive right gear train power assembly 36 is in threaded connection with a test bed hydraulic drive base 47 through a bolt, a spring washer, a flat washer and a nut in turn through a second motor 17 in the hydraulic drive right gear train power assembly 36; the hydraulic drive right gear train power assembly 36 is in threaded connection with a test bed hydraulic drive base 47 through a bolt, a spring washer and a flat washer in sequence through a second variable displacement hydraulic pump support frame 24 in the hydraulic drive right gear train power assembly 36; the hydraulic drive right gear train power assembly 36 is in threaded connection with a test bed hydraulic drive base 47 through a bolt, a spring washer and a flat washer in turn through a second variable hydraulic pump integrated block base 35 in the hydraulic drive right gear train power assembly 36; the hydraulic drive right gear train power assembly 36 is in threaded connection with a test bed hydraulic drive base 47 through a bolt, a spring washer and a flat washer in turn through an air brake valve performance test bed 75 in the hydraulic drive right gear train power assembly 36; the hydraulic drive right gear train power assembly 36 is in threaded connection with a test bed hydraulic drive base 47 through a bolt, a spring washer and a flat washer sequentially through an air brake valve reliability and durability test bed 76 in the hydraulic drive right gear train power assembly 36; the hydraulic drive right gear train power assembly 36 is in threaded connection with a test bed hydraulic drive base 47 through a brake cylinder performance test bed 77 in the hydraulic drive right gear train power assembly 36 through a bolt, a spring washer and a flat washer in sequence; the hydraulic drive right gear train power assembly 36 is in threaded connection with a test bed hydraulic drive base 47 through a test bed 78 for reliability and durability of a brake cylinder in the hydraulic drive right gear train power assembly 36 sequentially through bolts, spring washers and flat washers; the hydraulic drive right gear train power assembly 36 is in threaded connection with the test bed hydraulic drive base 47 through a cooler assembly 81 in the hydraulic drive right gear train power assembly 36 sequentially through a bolt, a spring washer and a flat washer; the hydraulic drive right gear train power assembly 36 is in threaded connection with the test bed hydraulic drive base 47 through a bolt, a spring washer and a flat washer in turn through an electrical control cabinet 82 in the hydraulic drive right gear train power assembly 36.

The hydraulic oil tank assembly 15 is arranged in the middle of a test bed hydraulic driving base 47 in the hydraulic driving base device 46; the supporting legs at four corners of the hydraulic oil tank assembly 15 are respectively provided with an equal-diameter cylindrical hole matched with the four equal-diameter threaded holes on the hydraulic driving base 47 of the test bed; the hydraulic oil tank assembly 15 is in threaded connection with the test bed hydraulic driving base 47 sequentially through bolts, spring washers and flat washers; the first motor 13 is arranged on the left side of the front part of the test bed hydraulic drive base 47 and is positioned between the first variable hydraulic pump support frame 7 and the second motor 17 in the hydraulic drive right-side gear train power assembly 36; the first motor 13 is in threaded connection with the hydraulic driving base 47 of the test bed sequentially through a bolt, a spring washer and a flat washer; the first variable hydraulic pump support frame 7 is a whole consisting of a horizontal cylinder, two vertical plates with the same geometric dimension and the same thickness and two L-shaped plates with the same geometric dimension and the same thickness; a vertical thread through hole is formed in the middle of the upper part of the outer part of a horizontal cylinder in the first variable hydraulic pump supporting frame 7, and the vertical thread through hole in the middle of the upper part of the outer part of the horizontal cylinder of the first variable hydraulic pump supporting frame 7 is matched with a thread of the first lubricating oil injection plug 9; two coaxial cylindrical holes with different diameters are arranged in a horizontal cylinder of the first variable hydraulic pump support frame 7, wherein the diameter of the left cylindrical hole is smaller than that of the right cylindrical hole; a rectangular groove matched with the first flat key 8 is arranged above a left cylindrical hole in the horizontal cylinder of the first variable hydraulic pump support frame 7; six horizontal threaded holes are uniformly distributed on the left end surface and the right end surface around the axial lead of two horizontal cylindrical holes of the first variable hydraulic pump support frame 7; the axial leads of two horizontal cylindrical holes of the first variable hydraulic pump support frame 7 are coaxial with the axial lead of a circle formed by the axial leads of two groups of six horizontal threaded holes at the left end and the right end; six horizontal threaded holes on the left end surface of a horizontal cylinder of the first variable hydraulic pump support frame 7 are matched with six horizontal cylindrical holes on the first end cover 6; six horizontal threaded holes on the right end face of the horizontal cylinder of the first variable hydraulic pump support frame 7 are matched with six horizontal cylindrical holes on the second end cover 12; a horizontal cylindrical hole is arranged in the middle of the first end cover 6; the diameter of a horizontal cylindrical hole in the middle of the first end cover 6 is equal to that of a left cylindrical hole of the first variable hydraulic pump support frame 7; the middle horizontal cylindrical hole of the first end cover 6 is matched with the cylinder of the driving shaft of the first variable hydraulic pump 5; a horizontal cylindrical hole is arranged in the middle of the second end cover 12 and is matched with the cylinder of the output shaft of the first motor 13; the outer part of the transmission sleeve 10 of the first variable hydraulic pump is a horizontal cylinder; two coaxial cylindrical holes with different diameters are arranged in a horizontal cylinder of the first variable hydraulic pump transmission sleeve 10, wherein the diameter of the cylindrical hole on the left side is smaller than that of the cylindrical hole on the right side; a flat key groove matched with the first flat key 8 is arranged in the cylindrical hole on the left side of the first variable hydraulic pump transmission sleeve 10; a flat key groove matched with the second flat key 11 is arranged in the cylindrical hole on the right side of the first variable hydraulic pump transmission sleeve 10; the horizontal cylinder axial lead of the first variable hydraulic pump transmission sleeve 10 is coaxial with the axial leads of two coaxial cylindrical holes with different diameters; the first variable hydraulic pump transmission sleeve 10 is arranged in a cylindrical hole on the right side of the first variable hydraulic pump support frame 7, and the left end of the first variable hydraulic pump transmission sleeve 10 is in contact with the right end of a cylindrical hole on the left side of the first variable hydraulic pump support frame 7; before the use, lubricating oil is added on the first variable hydraulic pump transmission sleeve 10 and the first variable hydraulic pump support frame 7 so as to reduce mechanical friction; the second end cap 12 is mounted on the cylinder of the output shaft of the first motor 13; the second flat key 11 is arranged in a cylindrical flat key groove of an output shaft of the first motor 13; after the second end cover 12, the second flat key 11 and the first motor 13 are assembled, the flat key groove in the right cylindrical hole of the transmission sleeve 10 of the first variable hydraulic pump is arranged on the cylinder of the output shaft of the first motor 13 along the second flat key 11; before the use, lubricating oil is added on the first variable hydraulic pump transmission sleeve 10, the second flat key 11 and the output shaft cylinder of the first electric motor 13 so as to reduce mechanical friction; the second end cover 12 is in threaded connection with the first variable hydraulic pump support frame 7 through a bolt, a spring washer and a flat washer in sequence; the first end cover 6 is arranged on a cylinder of a driving shaft of the first variable hydraulic pump 5; the first flat key 8 is arranged in the cylindrical flat key groove of the driving shaft of the first variable hydraulic pump 5; after the first end cover 6, the first flat key 8 and the first variable hydraulic pump 5 are assembled, the first flat key 8 on the cylinder of the driving shaft of the first variable hydraulic pump 5 is arranged on the first variable hydraulic pump supporting frame 7 along the flat key groove of the first variable hydraulic pump supporting frame 7 and the first variable hydraulic pump transmission sleeve 10; before the use, lubricating oil is added on the first end cover 6, the first flat key 8 and the drive shaft cylinder of the first variable hydraulic pump 5 so as to reduce mechanical friction; a connecting plate of the first variable hydraulic pump 5 is in threaded connection with a first variable hydraulic pump support frame 7 through a bolt, a spring washer, a flat washer and a first end cover 6 in sequence; the first variable hydraulic pump support frame 7 is in threaded connection with the test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; the oil suction port and the oil pressing port of the first variable hydraulic pump 5 are respectively provided with a pipe joint and sealed by a sealing ring; the left end of the oil suction pipe assembly 14 of the first variable hydraulic pump is connected with an oil suction pipe joint of the first variable hydraulic pump 5 through a pipe joint; the right end of the oil suction pipe assembly 14 of the first variable hydraulic pump is connected with a pipe joint at the left end of a first three-way joint 16 through a pipe joint; the right end of the first three-way joint 16 is connected with a pipe joint at the left end of a second variable hydraulic pump oil suction pipe assembly 18 in a hydraulic drive right gear train power assembly 36 through a pipe joint; one end of the hydraulic oil tank oil suction pipe assembly 64 is connected with the right end oil suction pipe joint at the lower part in front of the hydraulic oil tank assembly 15 through a pipe joint, and the other end is connected with the rear end pipe joint of the first three-way joint 16 through a pipe joint; the left end of a first variable hydraulic pump oil pipe assembly 4 is connected with a pipe joint at the right end of a first variable hydraulic pump integrated block base 57 through a pipe joint; the right end of a hydraulic oil pipe assembly 4 of the first variable hydraulic pump is connected with a hydraulic oil port pipe joint of the first variable hydraulic pump 5 through a pipe joint; the left front end of the first hydraulic system oil return pipe assembly 62 is connected with a pipe joint at the rear end of the first variable hydraulic pump manifold block base 57 through a pipe joint; the right end of the first hydraulic system oil return pipe assembly 62 is connected with a pipe joint at the left end of a second three-way joint 66 in the hydraulic drive right gear train power assembly 36 through a pipe joint; the first variable hydraulic pump manifold block base 57 is a cuboid; a pipe joint is arranged in the middle of the right end of the first variable hydraulic pump integrated block base 57; the middle pipe joint at the right end of the first variable hydraulic pump integrated block base 57 is matched with the pipe joint at the left end of the first variable hydraulic pump pressure oil pipe assembly 4; a pipe joint is arranged in the middle of the rear side of the first variable hydraulic pump integrated block base 57; the middle pipe joint behind the first variable hydraulic pump manifold block base 57 is matched with the front end pipe joint on the left side of the first hydraulic system oil return pipe assembly 62; the left end of the first variable hydraulic pump manifold block base 57 is provided with two pipe joints; the pipe joint at the front left end of the first variable hydraulic pump integrated block base 57 is matched with the pipe joint at the right upper end of the first high-pressure oil pipe assembly 68 in the hydraulic drive base device 46; the pipe joint at the rear left end of the first variable hydraulic pump manifold block base 57 is matched with the pipe joint at the right end of the upper side of a third high-pressure oil pipe assembly 70 in the hydraulic drive base device 46; a pipe joint at the front end of the left end of the first variable hydraulic pump integrated block base 57 is connected with a pipe joint at the upper end and the right end of the first high-pressure oil pipe assembly 68; the pipe joint at the rear left end of the first variable hydraulic pump manifold block base 57 is connected with the pipe joint at the right end of the upper side of the third high-pressure oil pipe assembly 70; four corners of the first variable hydraulic pump manifold block base 57 are respectively provided with a vertical cylindrical hole with the same diameter; the first variable hydraulic pump manifold block 60 is a rectangular parallelepiped; four corners of the first variable hydraulic pump manifold block 60 are respectively provided with a vertical cylindrical hole with the same diameter; four equal-diameter vertical cylindrical holes in four corners of the first variable hydraulic pump manifold block base 57 are matched with four equal-diameter vertical cylindrical holes in four corners of the first variable hydraulic pump manifold block 60; the first variable hydraulic pump manifold 60 is installed on the first variable hydraulic pump manifold base 57; the lower surface of the first variable displacement hydraulic pump manifold block 60 is in sealing contact with the upper surface of the first variable displacement hydraulic pump manifold block base 57 through a sealing ring; the first variable hydraulic pump manifold block 60 and the first variable hydraulic pump manifold block base 57 are in threaded connection with the test bed hydraulic driving base 47 in the hydraulic driving base device 46 sequentially through bolts, spring washers and flat washers; the front of the first variable hydraulic pump manifold block 60 is provided with four threaded holes matched with four cylindrical through holes of the second one-way proportional speed regulating valve 59; two oil holes are formed in the square formed by the axial leads of the four threaded holes in the front of the first variable hydraulic pump manifold block 60; the two oil holes in front of the first variable hydraulic pump manifold block 60 are matched with the two oil holes of the second one-way proportional speed regulating valve 59; the second one-way proportional speed regulating valve 59 is in sealing contact with the front surface of the first variable hydraulic pump manifold block 60 through a sealing ring; the second one-way proportional speed regulating valve 59 is in threaded connection with the front of the first variable hydraulic pump manifold block 60 sequentially through a bolt, a spring washer and a flat washer; four threaded holes matched with four cylindrical holes of the third one-way proportional speed regulating valve 67 are formed in the rear of the first variable hydraulic pump manifold block 60; two oil holes are formed in a square formed by the axial leads of the four threaded holes behind the first variable hydraulic pump manifold block 60; the two oil holes behind the first variable hydraulic pump manifold block 60 are matched with the two oil holes of the third one-way proportional speed regulating valve 67; the third one-way proportional speed regulating valve 67 is in sealing contact with the back of the first variable hydraulic pump manifold block 60 through a sealing ring; the third one-way proportional speed regulating valve 67 is in threaded connection with the rear side of the first variable hydraulic pump integrated block 60 sequentially through a bolt, a spring washer and a flat washer; the left side surface of the first variable hydraulic pump manifold block 60 is provided with four threaded holes matched with four cylindrical holes of the first electro-hydraulic proportional directional valve 58; four oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the left side surface of the first variable hydraulic pump manifold block 60; the four oil holes on the left side surface of the first variable hydraulic pump manifold block 60 are matched with the four oil holes of the first electro-hydraulic proportional directional valve 58; the first electro-hydraulic proportional directional valve 58 is in sealing contact with the left side surface of the first variable hydraulic pump manifold block 60 through a sealing ring; the first electro-hydraulic proportional directional valve 58 is in threaded connection with the left side face of the first variable hydraulic pump manifold block 60 through a bolt, a spring washer and a flat washer in sequence; the right side surface of the first variable hydraulic pump manifold block 60 is provided with four threaded holes matched with four cylindrical holes of the first pilot type proportional relief valve assembly 3; two oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the right side surface of the first variable hydraulic pump manifold block 60; the two oil holes on the right side surface of the first variable hydraulic pump manifold block 60 are matched with the two oil holes of the first pilot type proportional relief valve assembly 3; the first pilot-operated proportional relief valve assembly 3 is in sealing contact with the right side surface of the first variable hydraulic pump manifold block 60 through a sealing ring; the first pilot type proportional relief valve assembly 3 is in threaded connection with the right side face of the first variable hydraulic pump manifold block 60 sequentially through a bolt, a spring washer and a flat washer; the first pressure sensor assembly 2 is arranged at the right end in the middle of the upper surface of the first variable hydraulic pump manifold block 60; the first pressure gauge 61 is installed at the left end of the middle of the upper surface of the first variable displacement hydraulic pump manifold block 60.

The second electric motor 17 is arranged at the right side of the front part of a test bed hydraulic driving base 47 in the hydraulic driving base device 46 and is positioned between the second variable hydraulic pump support frame 24 and the first electric motor 13 in the hydraulic driving left side gear train power assembly 1; the second motor 17 is in threaded connection with the test bed hydraulic driving base 47 sequentially through a bolt, a spring washer and a flat washer; the second variable hydraulic pump support frame 24 is a whole composed of a horizontal cylinder, two vertical plates with the same geometric dimension and the same thickness, and two L-shaped plates with the same geometric dimension and the same thickness; a vertical thread through hole is formed in the middle of the upper part of the outer part of a horizontal cylinder in the second variable hydraulic pump support frame 24, and the vertical thread through hole in the middle of the upper part of the outer part of the horizontal cylinder of the second variable hydraulic pump support frame 24 is matched with the thread of the second lubricating oil injection plug 22; two coaxial cylindrical holes with different diameters are arranged in the horizontal cylinder of the second variable hydraulic pump support frame 24, wherein the diameter of the cylindrical hole on the left side is larger than that of the cylindrical hole on the right side; a rectangular groove matched with the fourth flat key 23 is formed above a right cylindrical hole in the horizontal cylinder of the second variable hydraulic pump support frame 24; six horizontal threaded holes are uniformly distributed on the left end surface and the right end surface around the axial lead of the two horizontal cylindrical holes of the second variable hydraulic pump support frame 24; the axial lines of two horizontal cylindrical holes of the second variable hydraulic pump support frame 24 are coaxial with the axial line of a circle formed by the axial lines of two groups of six horizontal threaded holes at the left end and the right end; six horizontal threaded holes on the left end surface of the horizontal cylinder of the second variable hydraulic pump support frame 24 are matched with six horizontal cylindrical holes on the third end cover 19; six horizontal threaded holes on the right end face of the horizontal cylinder of the second variable hydraulic pump support frame 24 are matched with six horizontal cylindrical holes on the fourth end cover 25; a horizontal cylindrical hole is arranged in the middle of the third end cover 19 and is matched with the cylinder of the output shaft of the second motor 17; a horizontal cylindrical hole is formed in the middle of the fourth end cover 25 and is equal to a cylindrical hole on the right side of the second variable hydraulic pump support frame 24; the middle horizontal cylindrical hole of the fourth end cover 25 is matched with the cylinder of a driving shaft of a second variable hydraulic pump 26; the outer part of the transmission sleeve 21 of the second variable hydraulic pump is a horizontal cylinder; two coaxial cylindrical holes with different diameters are arranged in the horizontal cylinder of the second variable hydraulic pump transmission sleeve 21, wherein the diameter of the cylindrical hole on the left side is larger than that of the cylindrical hole on the right side; a flat key groove matched with the third flat key 20 is arranged in the cylindrical hole on the left side of the second variable hydraulic pump transmission sleeve 21; a flat key groove matched with the fourth flat key 23 is arranged in the cylindrical hole on the right side of the second variable hydraulic pump transmission sleeve 21; the axial lead of the horizontal cylinder of the second variable hydraulic pump transmission sleeve 21 is coaxial with the axial leads of two coaxial cylindrical holes with different diameters; the second variable hydraulic pump transmission sleeve 21 is arranged in a cylindrical hole on the left side of the second variable hydraulic pump support frame 24, and the right end of the second variable hydraulic pump transmission sleeve 21 is contacted with the left end of a cylindrical hole on the right side of the second variable hydraulic pump support frame 24; before the use, lubricating oil is added on the second variable hydraulic pump transmission sleeve 21 and the second variable hydraulic pump support frame 24 so as to reduce mechanical friction; the third end cover 19 is arranged on the output shaft cylinder of the second motor 17; the third flat key 20 is arranged in a cylindrical flat key groove of an output shaft of the second motor 17; after the third end cap 19, the third flat key 20 and the second motor 17 are assembled, the flat key groove in the left cylindrical hole of the second variable hydraulic pump transmission sleeve 21 is arranged on the cylinder of the output shaft of the second motor 17 along the third flat key 20; before the use is started, lubricating oil is added on the second variable hydraulic pump transmission sleeve 21, the third flat key 20 and the output shaft cylinder of the second motor 17 so as to reduce mechanical friction; the third end cover 19 is in threaded connection with the second variable hydraulic pump support frame 24 through a bolt, a spring washer and a flat washer in sequence; the fourth end cover 25 is arranged on a driving shaft cylinder of a second variable hydraulic pump 26; the fourth flat key 23 is arranged in a flat key groove of a cylinder of a driving shaft of the second variable hydraulic pump 26; after the fourth end cover 25, the fourth flat key 23 and the second variable hydraulic pump 26 are assembled, the fourth flat key 23 on the cylinder of the drive shaft of the second variable hydraulic pump 26 is arranged on the second variable hydraulic pump support frame 24 along the flat key grooves of the second variable hydraulic pump support frame 24 and the second variable hydraulic pump transmission sleeve 21; before the use, lubricating oil is added on the cylinder of the driving shaft of the fourth end cover 25, the fourth flat key 23 and the second variable hydraulic pump 26 so as to reduce the mechanical friction; a connecting plate of a second variable hydraulic pump 26 is in threaded connection with a second variable hydraulic pump support frame 24 sequentially through a bolt, a spring washer, a flat washer and a fourth end cover 25; the second variable hydraulic pump support frame 24 is in threaded connection with the test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; the oil suction port and the oil pressing port of the second variable hydraulic pump 26 are respectively provided with a pipe joint and are sealed by sealing rings; the left end of an oil suction pipe assembly 18 of the second variable hydraulic pump is connected with a pipe joint at the right end of a first three-way joint 16 in the hydraulic drive left gear train power assembly 1 through a pipe joint; the right end of the oil suction pipe assembly 18 of the second variable hydraulic pump is connected with an oil suction pipe joint of a second variable hydraulic pump 26 through a pipe joint; the left end of a second variable hydraulic pump oil pipe assembly 27 is connected with a pipe joint of an oil pressing port of a second variable hydraulic pump 26 through a pipe joint; the right end of a second variable hydraulic pump oil pipe assembly 27 is connected with a pipe joint at the left end of a second variable hydraulic pump integrated block base 35 through a pipe joint; the left end of the second hydraulic system oil return pipe assembly 30 is connected with a pipe joint at the right end of a second three-way joint 66 through a pipe joint; the right front end of the second hydraulic system oil return pipe assembly 30 is connected with a pipe joint at the rear end of a second variable hydraulic pump manifold block base 35 through a pipe joint; the second variable hydraulic pump integrated block base 35 is a cuboid; a pipe joint is arranged in the middle of the left end of the second variable hydraulic pump integrated block base 35; the middle pipe joint at the left end of the second variable hydraulic pump integrated block base 35 is matched with the pipe joint at the right end of the second variable hydraulic pump oil pressing pipe assembly 27; a pipe joint is arranged in the middle of the rear side of the second variable hydraulic pump integrated block base 35; the middle pipe joint behind the second variable hydraulic pump manifold block base 35 is matched with the right front end of the second hydraulic system oil return pipe assembly 30; two pipe joints are arranged at the right end of the second variable hydraulic pump integrated block base 35; the pipe joint at the front end of the right end of the second variable hydraulic pump manifold block base 35 is matched with the pipe joint at the left end of the upper side of the sixth high-pressure oil pipe assembly 73 in the hydraulic drive base device 46; the pipe joint at the rear right end of the second variable hydraulic pump manifold block base 35 is matched with the pipe joint at the left upper end of the fourth high-pressure oil pipe assembly 71 in the hydraulic drive base device 46; the pipe joint at the front end of the right end of the second variable hydraulic pump manifold block base 35 is connected with the pipe joint at the left end of the upper side of the sixth high-pressure oil pipe assembly 73; the pipe joint at the rear of the right end of the second variable hydraulic pump manifold block base 35 is connected with the pipe joint at the left end of the upper side of the fourth high-pressure oil pipe assembly 71; four corners of the second variable hydraulic pump manifold block base 35 are respectively provided with a vertical cylindrical hole with the same diameter; the second variable hydraulic pump manifold block 32 is a cuboid; four corners of the second variable hydraulic pump manifold block 32 are respectively provided with a vertical cylindrical hole with the same diameter; four equal-diameter vertical cylindrical holes in four corners of a second variable hydraulic pump manifold block base 35 are matched with four equal-diameter vertical cylindrical holes in four corners of a second variable hydraulic pump manifold block 32; the second variable hydraulic pump manifold 32 is installed on the second variable hydraulic pump manifold base 35; the lower surface of the second variable hydraulic pump manifold block 32 is in sealing contact with the upper surface of a second variable hydraulic pump manifold block base 35 through a sealing ring; the second variable hydraulic pump manifold block 32 and the second variable hydraulic pump manifold block base 35 are in threaded connection with a test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; four threaded holes matched with the four cylindrical through holes of the first one-way proportional speed regulating valve 33 are formed in the front of the second variable hydraulic pump integrated block 32; two oil holes are formed in the square formed by the axial leads of the four threaded holes in front of the second variable hydraulic pump manifold block 32; the two oil holes in the front of the second variable hydraulic pump manifold block 32 are matched with the two oil holes of the first one-way proportional speed regulating valve 33; the first one-way proportional speed regulating valve 33 is in sealing contact with the front of the second variable hydraulic pump manifold block 32 through a sealing ring; the first one-way proportional speed regulating valve 33 is in threaded connection with the front of the second variable hydraulic pump integrated block 32 sequentially through a bolt, a spring washer and a flat washer; four threaded holes matched with four cylindrical holes of the fourth one-way proportional speed regulating valve 74 are formed in the rear of the second variable hydraulic pump integrated block 32; two oil holes are formed in a square formed by the axial leads of four threaded holes behind the second variable hydraulic pump manifold block 32; the two oil holes behind the second variable hydraulic pump manifold block 32 are matched with the two oil holes of the fourth one-way proportional speed regulating valve 74; the fourth one-way proportional speed regulating valve 74 is in sealing contact with the back of the second variable hydraulic pump manifold block 32 through a sealing ring; the fourth one-way proportional speed control valve 74 is in threaded connection with the rear of the second variable hydraulic pump manifold block 32 sequentially through a bolt, a spring washer and a flat washer; the right side surface of the second variable hydraulic pump manifold block 32 is provided with four threaded holes matched with four cylindrical holes of the second electro-hydraulic proportional directional valve 34; four oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the right side surface of the second variable hydraulic pump manifold block 32; the four oil holes on the right side surface of the second variable hydraulic pump manifold block 32 are matched with the four oil holes of the second electro-hydraulic proportional directional valve 34; the second electro-hydraulic proportional directional valve 34 is in sealing contact with the right side surface of the second variable hydraulic pump manifold block 32 through a sealing ring; the second electro-hydraulic proportional directional valve 34 is in threaded connection with the right side face of the second variable hydraulic pump manifold block 32 sequentially through a bolt, a spring washer and a flat washer; the left side surface of the second variable hydraulic pump manifold block 32 is provided with four threaded holes matched with four cylindrical holes of the second pilot type proportional relief valve assembly 28; two oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the left side surface of the second variable hydraulic pump manifold block 32; the two oil holes on the left side surface of the second variable hydraulic pump manifold block 32 are matched with the two oil holes of the second pilot type proportional relief valve assembly 28; the second pilot-operated proportional relief valve assembly 28 is in sealing contact with the left side surface of the second variable hydraulic pump manifold block 32 through a sealing ring; the second pilot type proportional relief valve assembly 28 is in threaded connection with the left side face of the second variable hydraulic pump manifold block 32 sequentially through a bolt, a spring washer and a flat washer; the second pressure sensor assembly 29 is arranged at the middle left end of the upper surface of the second variable hydraulic pump integrated block 32; the second pressure gauge 31 is arranged at the right end in the middle of the upper surface of the second variable hydraulic pump manifold block 32; the air brake valve performance test bench 75 is arranged at the left end of the rear part of the test bench hydraulic drive base 47; four corners of the air brake valve performance test bed 75 are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the test bed hydraulic driving base 47; the air brake valve performance test bed 75 is in threaded connection with the test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; the air brake valve reliability and durability test bed 76 is arranged at the rear part of the test bed hydraulic drive base 47, is positioned at the right side of the air brake valve performance test bed 75 and is positioned at the left side of the brake cylinder performance test bed 77; four corners of the air brake valve reliability and durability test bed 76 are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the test bed hydraulic driving base 47; the air brake valve reliability and durability test bed 76 is in threaded connection with the test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; the brake cylinder performance test bed 77 is arranged at the rear part of the test bed hydraulic drive base 47, is positioned at the right side of the air brake valve reliability and durability test bed 76, and is positioned at the left side of the brake cylinder reliability and durability test bed 78; four corners of the brake cylinder performance test bed 77 are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the test bed hydraulic driving base 47; the brake cylinder performance test bed 77 is in threaded connection with the test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; the brake cylinder reliability and durability test bed 78 is arranged at the right end of the rear part of the test bed hydraulic drive base 47; four corners of the brake cylinder reliability and durability test bed 78 are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the test bed hydraulic driving base 47; the brake cylinder reliability and durability test bed 78 is in threaded connection with the test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; the cooler assembly 81 is arranged at the right end of the middle part of the test bed hydraulic driving base 47; four equal-diameter cylindrical holes of the cooler assembly 81 are matched with four equal-diameter threaded holes in the hydraulic driving base 47 of the test bed; the cooler assembly 81 is in threaded connection with the test bed hydraulic driving base 47 sequentially through a bolt, a spring washer and a flat washer; the front end of the cooler oil inlet pipe assembly 65 is connected with a pipe joint at the rear end of the second three-way joint 66 through a pipe joint; the rear end of the cooler oil inlet pipe assembly 65 is connected with an oil inlet pipe joint of the cooler assembly 81 through a pipe joint; the right end of the cooler oil outlet pipe assembly 63 is connected with an oil outlet pipe joint of the cooler assembly 81 through a pipe joint; the left end of the cooler oil outlet pipe assembly 63 is connected with an oil return pipe joint at the back of a hydraulic oil tank assembly 15 in the hydraulic drive left gear train power assembly 1 through a pipe joint; the left end of the cooler water outlet pipe assembly 79 is connected with a water outlet pipe joint of the cooler assembly 81 through a pipe joint; the right end of the cooler water outlet pipe assembly 79 is connected with a cooling water return pipe joint through a pipe joint; the left end of the cooler water inlet pipe assembly 80 is connected with a pipe joint of a water inlet of the cooler assembly 81 through a pipe joint; the right end of the cooler water inlet pipe assembly 80 is connected with a cooling water source pipe joint through a pipe joint; the electrical control cabinet 82 is arranged at the left end of the middle part of the test bed hydraulic drive base 47; four corners of the electrical control cabinet 82 are respectively provided with an equal-diameter cylindrical hole matched with the four equal-diameter threaded holes on the test bed hydraulic driving base 47; the electrical control cabinet 82 is in threaded connection with the test bed hydraulic driving base 47 sequentially through bolts, spring washers and flat washers.

The test bed hydraulic driving base 47 is a rectangular steel plate with equal thickness; the left end of the rear part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of an air brake valve performance test bed 75 in the hydraulic drive right gear train power assembly 36; the left side of the rear part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of the test bed 76 for the reliability and durability of an air brake valve in the hydraulic drive right gear train power assembly 36; the right side of the rear part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of a brake cylinder performance test bed 77 in the hydraulic drive right gear train power assembly 36; the right end of the rear part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of a hydraulic drive right gear train power assembly 36 and a brake cylinder reliability and durability test bed 78; the middle part of the upper surface of the hydraulic drive base 47 of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of a hydraulic oil tank assembly 15 in the hydraulic drive left gear train power assembly 1; the right end of the middle part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of a cooler assembly 81 in the hydraulic drive right gear train power assembly 36; the left end of the middle part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the base of an electrical control cabinet 82 in the hydraulic drive right gear train power assembly 36; the left end of the front part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a first variable hydraulic pump integrated block base 57 and a first variable hydraulic pump integrated block 60 in the hydraulic drive left gear train power assembly 1; the left side of the front part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a first variable hydraulic pump support frame 7 in the hydraulic drive left gear train power assembly 1; the left side of the front part of the upper surface of the test bed hydraulic drive base 47 is provided with four kidney holes matched with four equal-diameter cylindrical holes on the base of a first motor 13 in the hydraulic drive left-side gear train power assembly 1; four kidney holes matched with four equal-diameter cylindrical holes in the base of a second motor 17 in the hydraulic drive right gear train power assembly 36 are formed in the right side of the front part of the upper surface of the test bed hydraulic drive base 47; four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a second variable hydraulic pump support frame 24 in the hydraulic drive right gear train power assembly 36 are formed in the right side of the front part of the upper surface of the test bed hydraulic drive base 47; the right end of the front part of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with the second variable hydraulic pump integrated block 32 in the hydraulic drive right gear train power assembly 36 and four equal-diameter cylindrical holes on the second variable hydraulic pump integrated block base 35; the right front corner of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with the four equal-diameter cylindrical holes on the first travelling wheel bracket 37; the right front corner of the lower surface of the test bed hydraulic drive base 47 is provided with a circular counter bore matched with the cylinder at the upper end of the first travelling wheel bracket 37; the left front corner of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the second travelling wheel bracket 48; a round counter bore matched with a cylinder at the upper end of the second travelling wheel bracket 48 is arranged at the left front corner of the lower surface of the test bed hydraulic drive base 47; the left rear corner of the upper surface of the test bed hydraulic driving base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on the third travelling wheel bracket 91; a round counter bore matched with the cylinder at the upper end of the third travelling wheel bracket 91 is arranged at the left rear corner of the lower surface of the test bed hydraulic drive base 47; the right rear corner of the upper surface of the test bed hydraulic drive base 47 is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in the fourth traveling wheel bracket 100; the right rear corner of the lower surface of the test bed hydraulic drive base 47 is provided with a circular counter bore matched with the cylinder at the upper end of the fourth traveling wheel bracket 100; the first traveling wheel bracket 37 is formed into a whole by die-casting a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimensions, and two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimensions, wherein the lower ends of the isosceles trapezoid steel plates are provided with arc transition vertical plates; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in the test bed hydraulic driving base 47 are uniformly distributed in the circular steel plate of the first travelling wheel bracket 37; a horizontal cylindrical hole matched with the cylinders of the first bush 40 and the second bush 44 is respectively arranged on the lower bosses of the two parallel vertical plates of which the lower ends adopt arc transition on the lower part of the first travelling wheel bracket 37; the axial lines of bosses at the lower parts of two parallel vertical plates of the first travelling wheel bracket 37 are coaxial with the axial lines of the two horizontal cylindrical holes; the horizontal cylindrical hole at the lower part of the left vertical plate of the first travelling wheel bracket 37 is matched with the cylinder of the second bush 44; the horizontal cylindrical hole at the lower part of the right vertical plate of the first travelling wheel bracket 37 is matched with the cylinder of the first bush 40; a vertical threaded hole matched with the thread of the cylinder of the fourth lubricating oil injection plug 45 is formed in a boss on the left side face of the lower part of the left vertical plate of the first travelling wheel bracket 37; a boss at the lower part of the vertical plate at the right side of the first travelling wheel bracket 37 is provided with a vertical threaded hole matched with the thread of the cylinder of the third lubricating oil injection plug 38; six horizontal threaded holes matched with six horizontal cylindrical holes in a connecting plate of a first hydraulic motor 39 are formed in a right side boss at the lower part of a vertical plate on the right side of the first travelling wheel bracket 37; the axis of a horizontal cylindrical hole on a right side boss at the lower part of a right vertical plate of the first travelling wheel bracket 37 is coaxial with the axis of a circle formed by the axes of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the first bushing 40; the right vertical cylindrical hole of the first bushing 40 is matched with a vertical threaded hole on a boss at the lower part of a vertical plate at the right side of the first travelling wheel bracket 37; the first bush 40 is arranged in a boss upper cylindrical hole at the lower part of a vertical plate at the right side of the first travelling wheel bracket 37; a vertical cylindrical hole is formed at the left side of the second bush 44; the left vertical cylindrical hole of the second bush 44 is matched with a vertical threaded hole on a lower boss of a left vertical plate of the first travelling wheel bracket 37; the second bush 44 is arranged in a boss upper cylindrical hole at the lower part of the left vertical plate of the first travelling wheel bracket 37; a cylindrical hole internal spline matched with the cylindrical spline of the first travelling wheel shaft 41 is arranged on the horizontal axis of the first travelling wheel 42; three cylinders with different coaxial diameters are arranged outside the first walking wheel shaft 41, wherein the diameter of the left cylinder is larger than that of the middle cylinder, and the diameter of the middle cylinder is larger than that of the right cylinder; a spline is arranged on the middle cylinder of the first travelling wheel shaft 41; an internal spline is arranged inside the right cylinder of the first travelling wheel shaft 41; the axis of a spline in the cylindrical hole at the right side of the first travelling wheel shaft 41 is coaxial with the axis of a spline on the middle cylinder; a circular groove matched with the first fixing snap ring 43 is formed in the left side of the middle cylindrical spline of the first travelling wheel shaft 41; the right end of the first travelling wheel shaft 41 penetrates through the second bush 44, the first fixed snap ring 43 and the first travelling wheel 42 in sequence, and the right end of the first travelling wheel shaft 41 extends out of the first bush 40; the first fixed clamping ring 43 is arranged in the circular groove of the first travelling wheel shaft 41, and the left end of the first fixed clamping ring 43 is contacted with the right end of the lower part of the left vertical plate of the first travelling wheel bracket 37; the right end of the left cylinder of the first travelling wheel shaft 41 is contacted with the left end of the lower part of the left vertical plate of the first travelling wheel bracket 37; the first walking wheel 42 is arranged on the middle cylindrical spline of the first walking wheel shaft 41; a fourth lubricating oil injection plug 45 is arranged in a vertical threaded hole on a left side boss at the lower part of a left vertical plate of the first travelling wheel bracket 37; the third lubricating oil injection plug 38 is arranged in a vertical threaded hole on a boss at the lower part of the vertical plate on the right side of the first travelling wheel bracket 37; the output shaft of the first hydraulic motor 39 is inserted into the spline of the right cylindrical hole of the first walking wheel shaft 41; the left end of the connecting plate of the first hydraulic motor 39 is contacted with the right end of the lower part of the right vertical plate of the first travelling wheel bracket 37; before use, lubricating oil is added to the output shafts of the first traveling wheel bracket 37, the first traveling wheel shaft 41, the first bush 40, the second bush 44, the first fixed snap ring 43, the first traveling wheel 42 and the first hydraulic motor 39 so as to reduce mechanical friction; a connecting plate of a first hydraulic motor 39 is in threaded connection with the right end of the lower part of the right vertical plate of the first travelling wheel bracket 37 through a bolt, a spring washer and a flat washer in sequence; the round steel plate of the first travelling wheel bracket 37 is in threaded connection with the lower surface of the right front corner of the test bed hydraulic drive base 47 sequentially through bolts, spring washers and flat washers; the lower right end pipe joint of the sixth high-pressure oil pipe assembly 73 is connected with the left end pipe joint of the first hydraulic motor 39; an upper pipe joint of the sixth high-pressure oil pipe assembly 73 is connected with a front pipe joint at the right end of the second variable hydraulic pump integrated block base 35 in the hydraulic drive right gear train power assembly 36; the left end pipe joint of the fifth high-pressure oil pipe assembly 72 is connected with the right end pipe joint of the first hydraulic motor 39; the right end pipe joint of the fifth high-pressure oil pipe assembly 72 is connected with the left end pipe joint of the fourth hydraulic motor 98; the second walking wheel bracket 48 is formed into a whole by die-casting a circular steel plate with the same thickness, two parallel semi-circular arc reinforcing rib plates with the same geometric dimension and two parallel isosceles trapezoid steel plates with the same geometric dimension and the same circular arc transition vertical plates at the lower ends of the isosceles trapezoid steel plates; four equal-diameter cylindrical holes matched with the four equal-diameter threaded holes in the hydraulic driving base 47 of the test bed are uniformly distributed in the round steel plate of the second travelling wheel bracket 48; a horizontal cylindrical hole matched with the cylinders of the third bush 50 and the fourth bush 54 is respectively arranged on a boss at the lower part of the vertical plate of which the two parallel lower ends adopt circular arc transition on the second travelling wheel bracket 48; the axial lead of the bosses at the lower parts of the two parallel vertical plates of the second travelling wheel bracket 48 is coaxial with the axial lead of the two horizontal cylindrical holes; the horizontal cylindrical hole at the lower part of the left vertical plate of the second travelling wheel bracket 48 is matched with the cylinder of the fourth bush 54; a horizontal cylindrical hole at the lower part of the right vertical plate of the second travelling wheel bracket 48 is matched with a cylinder of the third bush 50; a vertical threaded hole matched with the thread of the cylinder of the sixth lubricating oil injection plug 56 is formed in a boss on the left side surface of the lower part of the left vertical plate of the second travelling wheel bracket 48; a boss at the lower part of the vertical plate at the right side of the second travelling wheel bracket 48 is provided with a vertical threaded hole matched with the cylindrical thread of the fifth lubricating oil injection plug 49; six horizontal threaded holes matched with six horizontal cylindrical holes on a connecting plate of a second hydraulic motor 55 are formed in a left side boss at the lower part of a left vertical plate of the second travelling wheel bracket 48; the axis of a horizontal cylindrical hole on a left side boss at the lower part of a left vertical plate of the second travelling wheel bracket 48 is coaxial with the axis of a circle formed by the axes of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the third bushing 50; the right vertical cylindrical hole of the third bushing 50 is matched with a vertical threaded hole on a boss at the lower part of a vertical plate at the right side of the second travelling wheel bracket 48; the third bush 50 is arranged in a boss upper cylindrical hole at the lower part of the vertical plate at the right side of the second travelling wheel bracket 48; a vertical cylindrical hole is formed at the left side of the fourth bushing 54; the left vertical cylindrical hole of the fourth bush 54 is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the second travelling wheel bracket 48; the fourth bush 54 is arranged in a boss upper cylindrical hole at the lower part of the left vertical plate of the second travelling wheel bracket 48; a cylindrical hole internal spline matched with the cylindrical spline of the second travelling wheel shaft 53 is arranged on the horizontal axis of the second travelling wheel 52; three cylinders with coaxial different diameters are arranged outside the second walking wheel shaft 53, wherein the diameter of the left cylinder is smaller than that of the middle cylinder, and the diameter of the middle cylinder is smaller than that of the right cylinder; a spline is arranged on the middle cylinder of the second walking wheel shaft 53; an internal spline is arranged inside the left cylinder of the second travelling wheel shaft 53; the axial lead of a spline in the cylindrical hole on the left side of the second walking wheel shaft 53 is coaxial with the axial lead of a spline shaft on the middle cylinder; a circular groove matched with the second fixed snap ring 51 is formed in the right side of the middle cylindrical spline of the second travelling wheel shaft 53; the left end of a second walking wheel shaft 53 penetrates through a third bush 50, a second fixed snap ring 51 and a second walking wheel 52 in sequence, and the left end of the second walking wheel shaft 53 extends out of a fourth bush 54; the second fixed clamping ring 51 is arranged in a circular groove of the second travelling wheel shaft 53, and the right end of the second fixed clamping ring 51 is contacted with the left end of the lower part of the right vertical plate of the second travelling wheel bracket 48; the left end of the cylinder on the right of the second travelling wheel shaft 53 is in contact with the right end of the lower part of the vertical plate on the right of the second travelling wheel bracket 48; the second travelling wheel 52 is arranged on a cylindrical spline in the middle of a second travelling wheel shaft 53; a sixth lubricating oil injection plug 56 is arranged in a vertical threaded hole on a left side boss at the lower part of the left vertical plate of the second travelling wheel bracket 48; a fifth lubricating oil injection plug 49 is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the second travelling wheel bracket 48; the output shaft of the second hydraulic motor 55 is inserted into the left cylindrical spline of the second traveling wheel shaft 53; the right end of the connecting plate of the second hydraulic motor 55 is contacted with the left end of the lower part of the left vertical plate of the second travelling wheel bracket 48; before the use, lubricating oil is added on the output shafts of the second travelling wheel bracket 48, the second travelling wheel shaft 53, the third bush 50, the fourth bush 54, the second fixed snap ring 51, the second travelling wheel 52 and the second hydraulic motor 55 so as to reduce the mechanical friction; a connecting plate of a second hydraulic motor 55 is in threaded connection with the lower left end of the left vertical plate of the second walking wheel bracket 48 through a bolt, a spring washer and a flat washer in sequence; the round steel plate of the second walking wheel bracket 48 is in threaded connection with the lower surface of the left front corner of the test bed hydraulic driving base 47 through a bolt, a spring washer and a flat washer in sequence; the left end pipe joint at the lower side of the first high-pressure oil pipe assembly 68 is connected with the right end pipe joint of the second hydraulic motor 55; an upper pipe joint of the first high-pressure oil pipe assembly 68 is connected with a front pipe joint at the left end of a first variable hydraulic pump integrated block base 57 in the hydraulic drive left gear train power assembly 1; the right end pipe joint of the second high-pressure oil pipe assembly 69 is connected with the left end pipe joint of the second hydraulic motor 55; the left end pipe joint of the second high-pressure oil pipe assembly 69 is connected with the right end pipe joint of the third hydraulic motor 84; the third traveling wheel bracket 91 is formed into a whole by die-casting a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimension, and two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimension, wherein the lower ends of the isosceles trapezoid steel plates adopt vertical plates with arc transition; four equal-diameter cylindrical holes matched with the four equal-diameter threaded holes in the hydraulic driving base 47 of the test bed are uniformly distributed in the circular steel plate of the third travelling wheel bracket 91; a horizontal cylindrical hole matched with the cylinders of the fifth bush 85 and the sixth bush 89 is respectively arranged on a boss at the lower part of the vertical plate of which the two parallel lower ends of the third travelling wheel bracket 91 adopt arc transition; the axial lead of bosses at the lower parts of two parallel vertical plates of the third travelling wheel bracket 91 is coaxial with the axial lead of two horizontal cylindrical holes; the horizontal cylindrical hole at the lower part of the left vertical plate of the third travelling wheel bracket 91 is matched with the cylinder of the sixth lining 89; a horizontal cylindrical hole at the lower part of the right vertical plate of the third travelling wheel bracket 91 is matched with a cylinder of the fifth bush 85; a vertical threaded hole matched with the thread of the cylinder of the eighth lubricating oil injection plug 90 is formed in a boss on the left side surface of the lower part of the left vertical plate of the third travelling wheel bracket 91; a vertical threaded hole matched with the cylindrical thread of the seventh lubricating oil injection plug 83 is formed in a boss at the lower part of the vertical plate on the right side of the third travelling wheel bracket 91; six horizontal threaded holes matched with six horizontal cylindrical holes in a connecting plate of the third hydraulic motor 84 are formed in a right side boss at the lower part of a right vertical plate of the third travelling wheel bracket 91; the axis of a horizontal cylindrical hole on a boss on the right side surface of the lower part of the right vertical plate of the third travelling wheel bracket 91 is coaxial with the axis of a circle formed by the axes of the six horizontal threaded holes; the outside of the fifth bush 85 is a horizontal cylinder; a vertical cylindrical hole is formed in the right side of the fifth bush 85; the right vertical cylindrical hole of the fifth bush 85 is matched with a vertical threaded hole on a boss at the lower part of a vertical plate at the right of the third travelling wheel bracket 91; the fifth bush 85 is installed in a boss upper cylindrical hole at the lower part of the vertical plate at the right side of the third traveling wheel bracket 91; a vertical cylindrical hole is formed in the left side of the sixth bushing 89; the left vertical cylindrical hole of the sixth bushing 89 is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the third travelling wheel bracket 91; the sixth bushing 89 is installed in a boss upper cylindrical hole at the lower part of the left vertical plate of the third traveling wheel bracket 91; a cylindrical hole internal spline matched with the cylindrical spline of the third travelling wheel shaft 86 is arranged on the horizontal axis of the third travelling wheel 87; three cylinders with different coaxial diameters are arranged outside the third travelling wheel shaft 86, wherein the diameter of the left cylinder is larger than that of the middle cylinder, and the diameter of the middle cylinder is larger than that of the right cylinder; a spline is arranged on the middle cylinder of the third travelling wheel shaft 86; an internal spline is arranged inside the right cylinder of the third travelling wheel shaft 86; the axis of the spline in the cylindrical hole on the right side of the third travelling wheel shaft 86 is coaxial with the axis of the spline on the middle cylinder; a circular ring groove matched with the third fixed snap ring 88 is arranged on the left side of the middle cylindrical spline of the third travelling wheel shaft 86; the right end of the third travelling wheel shaft 86 penetrates through a sixth bushing 89, a third fixed snap ring 88 and a third travelling wheel 87 in sequence, and the right end of the third travelling wheel shaft 86 extends out of the fifth bushing 85; a third fixed snap ring 88 is arranged in a circular groove of the third travelling wheel shaft 86, and the left end of the third fixed snap ring 88 is contacted with the right end of the lower part of the left vertical plate of the third travelling wheel bracket 91; the right end of the left cylinder of the third travelling wheel shaft 86 is contacted with the left end of the lower part of the left vertical plate of the third travelling wheel bracket 91; a third travelling wheel 87 is arranged on the middle cylindrical spline of the third travelling wheel shaft 86; the eighth lubricating oil injection plug 90 is arranged in a vertical threaded hole on a left side boss at the lower part of a left vertical plate of the third travelling wheel bracket 91; the seventh lubricating oil injection plug 83 is arranged in a vertical threaded hole on a boss at the lower part of the vertical plate on the right side of the third travelling wheel bracket 91; the output shaft of the third hydraulic motor 84 is inserted into the right cylindrical spline of the third traveling wheel shaft 86; the left end of the connecting plate of the third hydraulic motor 84 is contacted with the right end of the lower part of the vertical plate at the right side of the third travelling wheel bracket 91; before the use, lubricating oil is added to the output shafts of the third travelling wheel bracket 91, the third travelling wheel shaft 86, the fifth bush 85, the sixth bush 89, the third fixed snap ring 88, the third travelling wheel 87 and the third hydraulic motor 84 so as to reduce mechanical friction; a connecting plate of the third hydraulic motor 84 is in threaded connection with the right end of the lower part of the right vertical plate of the third travelling wheel bracket 91 through a bolt, a spring washer and a flat washer in sequence; the third traveling wheel bracket 91 is in threaded connection with the lower surface of the left rear corner of the test bed hydraulic driving base 47 through a bolt, a spring washer and a flat washer in sequence; the lower right end pipe joint of the third high-pressure oil pipe assembly 70 is connected with the left end pipe joint of the third hydraulic motor 84; the pipe joint at the upper side of the third high-pressure oil pipe assembly 70 is connected with the pipe joint at the rear left end of the first variable hydraulic pump integrated block base 57 in the hydraulic drive left gear train power assembly 1; the left end pipe joint of the second high-pressure oil pipe assembly 69 is connected with the right end pipe joint of the third hydraulic motor 84; the right end pipe joint of the second high-pressure oil pipe assembly 69 is connected with the left end pipe joint of the second hydraulic motor 55; the fourth traveling wheel bracket 100 is formed by a circular steel plate with the same thickness, two parallel semi-circular arc reinforcing rib plates with the same geometric dimension and two parallel isosceles trapezoid steel plates with the same geometric dimension, wherein the lower ends of the isosceles trapezoid steel plates are formed into a whole by die casting by adopting circular arc transition vertical plates; four equal-diameter cylindrical holes matched with the four equal-diameter threaded holes in the hydraulic driving base 47 of the test bed are uniformly distributed in the circular steel plate of the fourth traveling wheel bracket 100; a horizontal cylindrical hole matched with the cylinders of the seventh bushing 93 and the eighth bushing 97 is respectively formed in bosses at the lower parts of two parallel vertical plates of the fourth traveling wheel bracket 100, the lower ends of which are in arc transition; the axial lines of bosses at the lower parts of two parallel vertical plates of the fourth travelling wheel bracket 100 are coaxial with the axial lines of the two horizontal cylindrical holes; the horizontal cylindrical hole at the lower part of the left vertical plate of the fourth traveling wheel bracket 100 is matched with the cylinder of the eighth bushing 97; a horizontal cylindrical hole at the lower part of the right vertical plate of the fourth traveling wheel bracket 100 is matched with a cylinder of the seventh bushing 93; a vertical threaded hole matched with the thread of the cylinder 99 of the tenth lubricating oil injection plug is formed in a boss on the left side surface of the lower part of the left vertical plate of the fourth travelling wheel bracket 100; a boss at the lower part of the right vertical plate of the fourth traveling wheel bracket 100 is provided with a vertical threaded hole matched with the thread of the cylinder 92 of the ninth lubricating oil injection plug; six horizontal threaded holes matched with six horizontal cylindrical holes on a connecting plate of the fourth hydraulic motor 98 are formed in a boss on the left side surface of the lower part of a vertical plate of the fourth traveling wheel bracket 100; the axial lead of a horizontal cylindrical hole on a left side boss at the lower part of a left vertical plate of the fourth travelling wheel bracket 100 is coaxial with the axial lead of a circle formed by the axial leads of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the seventh bushing 93; the right vertical cylindrical hole of the seventh bushing 93 is matched with a vertical threaded hole on a boss at the lower part of a right vertical plate of the fourth travelling wheel bracket 100; the seventh bushing 93 is arranged in a boss upper cylindrical hole at the lower part of the right vertical plate of the fourth traveling wheel bracket 100; a vertical cylindrical hole is formed in the left side of the eighth bushing 97; the left vertical cylindrical hole of the eighth bushing 97 is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the fourth traveling wheel bracket 100; the eighth bushing 97 is arranged in a cylindrical hole on a boss at the lower part of the left vertical plate of the fourth traveling wheel bracket 100; a cylindrical hole internal spline matched with the cylindrical spline of the fourth traveling wheel shaft 96 is arranged on the horizontal axis of the fourth traveling wheel 95; three cylinders with coaxial different diameters are arranged outside the fourth walking wheel shaft 96, wherein the diameter of the left cylinder is smaller than that of the middle cylinder, and the diameter of the middle cylinder is smaller than that of the right cylinder; a spline is arranged on the middle cylinder of the fourth traveling wheel shaft 96; an internal spline is arranged inside the left cylinder of the fourth traveling wheel shaft 96; the axial lead of a spline in the cylindrical hole on the left side of the fourth traveling wheel shaft 96 is coaxial with the axial lead of a spline on the middle cylinder; a circular groove matched with the fourth fixed snap ring 94 is formed in the right side of the spline of the middle cylinder of the fourth walking wheel shaft 96; the left end of a fourth traveling wheel shaft 96 penetrates through a seventh bushing 93, a fourth fixed snap ring 94 and a fourth traveling wheel 95 in sequence, and the left end of the fourth traveling wheel shaft 96 extends out of an eighth bushing 97; the fourth fixed snap ring 94 is arranged in a circular groove of a fourth traveling wheel shaft 96, and the right end of the fourth fixed snap ring 94 is in contact with the left end of the lower part of the right vertical plate of the fourth traveling wheel bracket 100; the left end of the cylinder on the right of the fourth traveling wheel shaft 96 is in contact with the right end of the lower part of the vertical plate on the right of the fourth traveling wheel bracket 100; a fourth traveling wheel 95 is arranged on a cylindrical spline in the middle of a fourth traveling wheel shaft 96; the tenth lubricating oil injection plug screw 99 is arranged in a vertical threaded hole on a left side boss at the lower part of a left vertical plate of the fourth traveling wheel bracket 100; the ninth lubricating oil filling screw plug 92 is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the fourth traveling wheel bracket 100; the output shaft of the fourth hydraulic motor 98 is inserted into the left cylindrical spline of the fourth traveling wheel shaft 96; the right end of a connecting plate of a fourth hydraulic motor 98 is contacted with the left end of the lower part of a left vertical plate of a fourth travelling wheel bracket 100; before the use, lubricating oil is added on the output shafts of the fourth traveling wheel bracket 100, the fourth traveling wheel shaft 96, the seventh bushing 93, the eighth bushing 97, the fourth fixed snap ring 94, the fourth traveling wheel 95 and the fourth hydraulic motor 98 so as to reduce the mechanical friction; a connecting plate of a fourth hydraulic motor 98 is in threaded connection with the left end of the lower part of the left vertical plate of the fourth travelling wheel bracket 100 through a bolt, a spring washer and a flat washer in turn; the round steel plate of the fourth traveling wheel bracket 100 is in threaded connection with the lower surface of the right rear corner of the hydraulic driving base 47 of the test bed sequentially through bolts, spring washers and flat washers; the left end pipe joint at the lower side of the fourth high-pressure oil pipe assembly 71 is connected with the right end pipe joint of the fourth hydraulic motor 98; an upper pipe joint of the fourth high-pressure oil pipe assembly 71 is connected with a rear pipe joint at the right end of a second variable hydraulic pump integrated block base 35 in the hydraulic drive right gear train power assembly 36; the right end pipe joint of the fifth high-pressure oil pipe assembly 72 is connected with the left end pipe joint of the fourth hydraulic motor 98; the left end pipe joint of the fifth high-pressure oil pipe assembly 72 is connected with the right end pipe joint of the first hydraulic motor 39.

When the electromagnets of the first electro-hydraulic proportional reversing valve 58 and the second electro-hydraulic proportional reversing valve 34 are powered off and are positioned at the middle position, the automobile air brake valve and the brake cylinder test bed hydraulic driving base assembly are in a braking state, and the automobile air brake valve and the brake cylinder test bed hydraulic driving base assembly stop in situ; when the electromagnet of the first electro-hydraulic proportional reversing valve 58 is electrified in a left working state and the electromagnet of the second electro-hydraulic proportional reversing valve 34 is electrified in a right working state, the automobile air brake valve and the brake cylinder test bed hydraulic drive base assembly rotate clockwise on site; when the electromagnet of the first electro-hydraulic proportional reversing valve 58 is electrified in a right-position working state and the electromagnet of the second electro-hydraulic proportional reversing valve 34 is electrified in a left-position working state, the automobile air brake valve and the brake cylinder test bed hydraulic drive base assembly rotate anticlockwise on site; when the electromagnet of the first electro-hydraulic proportional reversing valve 58 is electrified to be in a left working state and the electromagnet of the second electro-hydraulic proportional reversing valve 34 is electrified to be in a left working state, the automobile air brake valve and brake cylinder test bed hydraulic drive base assembly moves forwards, and parts or elements and pipelines in the front of the automobile air brake valve and brake cylinder test bed can be subjected to test preparation, maintenance and the like; when the electromagnet of the first electro-hydraulic proportional reversing valve 58 is electrified to be in a right working state and the electromagnet of the second electro-hydraulic proportional reversing valve 34 is electrified to be in a right working state, the automobile air brake valve and brake cylinder test bed hydraulic driving base assembly moves backwards, and test preparation, maintenance and the like can be carried out on parts or elements and pipelines at the rear part of the automobile air brake valve and brake cylinder test bed.

The hydraulic drive base assembly of the automobile air brake valve and brake cylinder test bed provided by the embodiment has the advantages of reasonable structure, low cost, convenience in installation, flexible hydraulic drive variable speed walking, variable speed steering and braking capability, good strength and rigidity, capability of realizing rapid braking and brake release, short test preparation time, convenience in maintenance and repair, improvement of the working efficiency of test operators, improvement of the service life of the automobile air brake valve and brake cylinder test bed, and guarantee of the comprehensive performance of the hydraulic drive base assembly of the automobile air brake valve and brake cylinder test bed.

Through experimental verification, the automobile air brake valve and brake cylinder test bed hydraulic driving base assembly provided by the embodiment has the advantages and is completely suitable for the automobile air brake valve and brake cylinder test bed.

Claims

1. The utility model provides an automobile air brake valve and brake cylinder test bench hydraulic drive base assembly, includes: a hydraulic drive left gear train power assembly (1), a hydraulic drive right gear train power assembly (36) and a hydraulic drive base device (46); the method is characterized in that:

the hydraulic drive left gear train power assembly (1) is connected with a second variable hydraulic pump oil suction pipe assembly (18) in the hydraulic drive right gear train power assembly (36) through a first three-way joint (16) in the hydraulic drive left gear train power assembly (1); the hydraulic drive left side gear train power assembly (1) is connected with a second three-way joint (66) in the hydraulic drive right side gear train power assembly (36) through a first hydraulic system oil return pipe assembly (62) in the hydraulic drive left side gear train power assembly (1); the hydraulic drive left gear train power assembly (1) is connected with a cooler oil outlet pipe assembly (63) in the hydraulic drive right gear train power assembly (36) through a hydraulic oil tank assembly (15) in the hydraulic drive left gear train power assembly (1); the hydraulic drive left gear train power assembly (1) is connected with a test bed hydraulic drive base (47) in a hydraulic drive base device (46) through a hydraulic oil tank assembly (15); the hydraulic oil tank assembly (15) is in threaded connection with a hydraulic driving base (47) of the test bed; the hydraulic drive left gear train power assembly (1) is in threaded connection with a hydraulic drive base (47) of the test bed through a first variable hydraulic pump support frame (7) in the hydraulic drive left gear train power assembly (1); the hydraulic drive left gear train power assembly (1) is in threaded connection with a hydraulic drive base (47) of the test bed through a first motor (13) in the hydraulic drive left gear train power assembly (1); the hydraulic drive left gear train power assembly (1) is in threaded connection with a test bed hydraulic drive base (47) through a first variable hydraulic pump integrated block base (57) in the hydraulic drive left gear train power assembly (1); the hydraulic drive left gear train power assembly (1) is connected with a first high-pressure oil pipe assembly (68) and a third high-pressure oil pipe assembly (70) in a hydraulic drive base device (46) through a first variable hydraulic pump integrated block base (57); the hydraulic drive right gear train power assembly (36) is in threaded connection with a hydraulic drive base (47) of the test bed through a second motor (17) in the hydraulic drive right gear train power assembly (36); the hydraulic drive right gear train power assembly (36) is in threaded connection with a test bed hydraulic drive base (47) through a second variable hydraulic pump support frame (24) in the hydraulic drive right gear train power assembly (36); the hydraulic drive right gear train power assembly (36) is in threaded connection with a test bed hydraulic drive base (47) through a second variable hydraulic pump integrated block base (35) in the hydraulic drive right gear train power assembly (36); the hydraulic drive right gear train power assembly (36) is in threaded connection with a test bench hydraulic drive base (47) through an air brake valve performance test bench (75) in the hydraulic drive right gear train power assembly (36); the hydraulic drive right gear train power assembly (36) is in threaded connection with a test bed hydraulic drive base (47) through an air brake valve reliability and durability test bed (76) in the hydraulic drive right gear train power assembly (36); the hydraulic drive right gear train power assembly (36) is in threaded connection with a test bed hydraulic drive base (47) through a brake cylinder performance test bed (77) in the hydraulic drive right gear train power assembly (36); the hydraulic drive right side gear train power assembly (36) is in threaded connection with a test bed hydraulic drive base (47) through a test bed (78) for testing the reliability and the durability of a brake cylinder in the hydraulic drive right side gear train power assembly (36); the hydraulic drive right gear train power assembly (36) is in threaded connection with a hydraulic drive base (47) of the test bed through a cooler assembly (81) in the hydraulic drive right gear train power assembly (36); the hydraulic drive right side gear train power assembly (36) is in threaded connection with the test bed hydraulic drive base (47) through an electric control cabinet (82) in the hydraulic drive right side gear train power assembly (36).

2. The automotive pneumatic brake valve and brake cylinder test stand hydraulic drive foot assembly of claim 1, wherein the hydraulic drive left side train power assembly (1) comprises:

a first pressure sensor assembly (2), a first guide type proportional overflow valve assembly (3), a first variable hydraulic pump pressure oil pipe assembly (4), a first variable hydraulic pump (5), a first end cover (6), a first variable hydraulic pump support frame (7), a first flat key (8), a first lubricating oil injection plug (9), a first variable hydraulic pump transmission sleeve (10), a second flat key (11) and a second end cover (12), the hydraulic control system comprises a first motor (13), a first variable hydraulic pump oil suction pipe assembly (14), a hydraulic oil tank assembly (15), a first three-way joint (16), a first variable hydraulic pump integrated block base (57), a first electro-hydraulic proportional reversing valve (58), a second one-way proportional speed regulating valve (59), a first variable hydraulic pump integrated block (60), a first pressure gauge (61), a first hydraulic system oil return pipe assembly (62), a hydraulic oil tank oil suction pipe assembly (64) and a third one-way proportional speed regulating valve (67); wherein:

the hydraulic oil tank assembly (15) is arranged in the middle of a test bed hydraulic driving base (47) in the hydraulic driving base device (46); supporting legs at four corners of the hydraulic oil tank assembly (15) are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes in the hydraulic driving base (47) of the test bed; the hydraulic oil tank assembly (15) is in threaded connection with a hydraulic driving base (47) of the test bed; the first motor (13) is arranged on the left side of the front part of the hydraulic drive base (47) of the test bed and is positioned between the first variable hydraulic pump support frame (7) and a second motor (17) in the hydraulic drive right gear train power assembly (36); the first motor (13) is in threaded connection with a hydraulic driving base (47) of the test bed; the first variable hydraulic pump support frame (7) is a whole consisting of a horizontal cylinder, two vertical plates with the same geometric dimension and the same thickness and two L-shaped plates with the same geometric dimension and the same thickness; a vertical thread through hole is arranged in the middle of the upper part of the outer part of a horizontal cylinder in a first variable hydraulic pump support frame (7); a vertical thread through hole in the middle of the upper part of the outer part of a horizontal cylinder of a first variable hydraulic pump support frame (7) is matched with a thread of a first lubricating oil injection plug (9); two coaxial cylindrical holes with different diameters are arranged in a horizontal cylinder of a first variable hydraulic pump support frame (7), wherein the diameter of the cylindrical hole on the left side is smaller than that of the cylindrical hole on the right side; a rectangular groove matched with the first flat key (8) is arranged above a left cylindrical hole in the horizontal cylinder of the first variable hydraulic pump support frame (7); six horizontal threaded holes are uniformly distributed on the left end surface and the right end surface around the axial lead of two horizontal cylindrical holes of the first variable hydraulic pump support frame (7); the axial lead of two horizontal cylindrical holes of the first variable hydraulic pump support frame (7) is coaxial with the axial lead of a circle formed by the axial leads of two groups of six horizontal threaded holes at the left end and the right end; six horizontal threaded holes in the left end face of a horizontal cylinder of the first variable hydraulic pump support frame (7) are matched with six horizontal cylindrical holes in the first end cover (6); six horizontal threaded holes in the right end face of a horizontal cylinder of the first variable hydraulic pump support frame (7) are matched with six horizontal cylindrical holes in the second end cover (12); a horizontal cylindrical hole is formed in the middle of the first end cover (6); the diameter of a horizontal cylindrical hole in the middle of the first end cover (6) is equal to that of a left cylindrical hole of the first variable hydraulic pump support frame (7); a horizontal cylindrical hole in the middle of the first end cover (6) is matched with a cylinder of a driving shaft of the first variable hydraulic pump (5); a horizontal cylindrical hole is formed in the middle of the second end cover (12) and is matched with the cylinder of the output shaft of the first motor (13); the outer part of the transmission sleeve (10) of the first variable hydraulic pump is a horizontal cylinder; two coaxial cylindrical holes with different diameters are arranged in a horizontal cylinder of a first variable hydraulic pump transmission sleeve (10), wherein the diameter of the cylindrical hole on the left side is smaller than that of the cylindrical hole on the right side; a flat key groove matched with the first flat key (8) is arranged in the cylindrical hole on the left side of the first variable hydraulic pump transmission sleeve (10); a flat key groove matched with the second flat key (11) is arranged in the right cylindrical hole of the first variable hydraulic pump transmission sleeve (10); the axial lead of a horizontal cylinder of a first variable hydraulic pump transmission sleeve (10) is coaxial with the axial leads of two coaxial cylindrical holes with different diameters; the first variable hydraulic pump transmission sleeve (10) is arranged in a cylindrical hole on the right side of the first variable hydraulic pump support frame (7), and the left end of the first variable hydraulic pump transmission sleeve (10) is in contact with the right end of the cylindrical hole on the left side of the first variable hydraulic pump support frame (7); the second end cover (12) is arranged on the cylinder of the output shaft of the first motor (13); the second flat key (11) is arranged in a cylindrical flat key groove of an output shaft of the first motor (13); after the second end cover (12), the second flat key (11) and the first motor (13) are assembled, the flat key groove in the right cylindrical hole of the first variable hydraulic pump transmission sleeve (10) is arranged on the cylinder of the output shaft of the first motor (13) along the second flat key (11); the second end cover (12) is in threaded connection with the first variable hydraulic pump support frame (7); the first end cover (6) is arranged on a cylinder of a driving shaft of the first variable hydraulic pump (5); the first flat key (8) is arranged in a cylindrical flat key groove of a driving shaft of the first variable hydraulic pump (5); after the first end cover (6), the first flat key (8) and the first variable hydraulic pump (5) are assembled, the first flat key (8) on the cylinder of the driving shaft of the first variable hydraulic pump (5) is arranged on the first variable hydraulic pump supporting frame (7) along the flat key grooves of the first variable hydraulic pump supporting frame (7) and the first variable hydraulic pump transmission sleeve (10); a connecting plate of the first variable hydraulic pump (5) is in threaded connection with a first variable hydraulic pump supporting frame (7) through a first end cover (6); the first variable hydraulic pump support frame (7) is in threaded connection with a test bed hydraulic drive base (47); an oil suction port and an oil pressing port of the first variable hydraulic pump (5) are respectively provided with a pipe joint and are sealed by a sealing ring; the left end of an oil suction pipe assembly (14) of the first variable hydraulic pump is connected with an oil suction pipe joint of the first variable hydraulic pump (5) through a pipe joint; the right end of an oil suction pipe assembly (14) of the first variable hydraulic pump is connected with a pipe joint at the left end of a first three-way joint (16) through a pipe joint; the right end of the first three-way joint (16) is connected with a pipe joint at the left end of a second variable hydraulic pump oil suction pipe assembly (18) in a hydraulic drive right gear train power assembly (36) through a pipe joint; one end of the hydraulic oil tank oil suction pipe assembly (64) is connected with a right end oil suction pipe joint at the lower part in front of the hydraulic oil tank assembly (15) through a pipe joint, and the other end of the hydraulic oil tank oil suction pipe assembly is connected with a rear end pipe joint of the first three-way joint (16) through a pipe joint; the left end of a first variable hydraulic pump oil pipe assembly (4) is connected with a pipe joint at the right end of a first variable hydraulic pump integrated block base (57) through a pipe joint; the right end of a hydraulic oil pipe assembly (4) of the first variable hydraulic pump is connected with a hydraulic oil port pipe joint of the first variable hydraulic pump (5) through a pipe joint; the left front end of a first hydraulic system oil return pipe assembly (62) is connected with a pipe joint at the rear end of a first variable hydraulic pump manifold block base (57) through a pipe joint; the right end of a first hydraulic system oil return pipe assembly (62) is connected with a pipe joint at the left end of a second three-way joint (66) in a hydraulic drive right-side gear train power assembly (36) through a pipe joint; the first variable hydraulic pump manifold block base (57) is a cuboid; a pipe joint is arranged in the middle of the right end of the first variable hydraulic pump integrated block base (57); a middle pipe joint at the right end of the first variable hydraulic pump manifold block base (57) is matched with a pipe joint at the left end of a first variable hydraulic pump pressure oil pipe assembly (4); a pipe joint is arranged in the middle of the rear side of the first variable hydraulic pump integrated block base (57); a middle pipe joint behind the first variable hydraulic pump manifold block base (57) is matched with a pipe joint at the front end of the left side of a first hydraulic system oil return pipe assembly (62); the left end of the first variable hydraulic pump manifold block base (57) is provided with two pipe joints; the pipe joint at the front side of the left end of the first variable hydraulic pump integrated block base (57) is matched with the pipe joint at the upper side and the right end of a first high-pressure oil pipe assembly (68) in the hydraulic drive base device (46); a pipe joint at the rear left end of a first variable hydraulic pump manifold block base (57) is matched with a pipe joint at the upper right end of a third high-pressure oil pipe assembly (70) in a hydraulic driving base device (46); a pipe joint at the front side of the left end of the first variable hydraulic pump integrated block base (57) is connected with a pipe joint at the upper right end of the first high-pressure oil pipe assembly (68); the pipe joint at the rear left end of the first variable hydraulic pump manifold block base (57) is connected with the pipe joint at the right end of the upper side of the third high-pressure oil pipe assembly (70); four corners of the first variable hydraulic pump manifold block base (57) are respectively provided with a vertical cylindrical hole with the same diameter; the first variable hydraulic pump manifold block (60) is a cuboid; four corners of the first variable hydraulic pump manifold block (60) are respectively provided with a vertical cylindrical hole with the same diameter; four equal-diameter vertical cylindrical holes in four corners of a first variable hydraulic pump manifold block base (57) are matched with four equal-diameter vertical cylindrical holes in four corners of a first variable hydraulic pump manifold block (60); the first variable hydraulic pump integrated block (60) is arranged on the first variable hydraulic pump integrated block base (57); the lower surface of the first variable hydraulic pump manifold block (60) is in sealing contact with the upper surface of a first variable hydraulic pump manifold block base (57) through a sealing ring; the first variable hydraulic pump manifold block (60) and the first variable hydraulic pump manifold block base (57) are in threaded connection with a test bed hydraulic driving base (47) in the hydraulic driving base device (46); four threaded holes matched with four cylindrical through holes of the second one-way proportional speed regulating valve (59) are formed in the front of the first variable hydraulic pump manifold block (60); two oil holes are formed in a square formed by the axial leads of four threaded holes in the front of the first variable hydraulic pump manifold block (60); the two oil holes in the front of the first variable hydraulic pump manifold block (60) are matched with the two oil holes of the second one-way proportional speed regulating valve (59); the second one-way proportional speed regulating valve (59) is in sealing contact with the front surface of the first variable hydraulic pump manifold block (60) through a sealing ring; the second one-way proportional speed regulating valve (59) is in threaded connection with the front of the first variable hydraulic pump integrated block (60); four threaded holes matched with four cylindrical holes of a third one-way proportional speed regulating valve (67) are formed in the back of the first variable hydraulic pump manifold block (60); two oil holes are formed in a square formed by the axial leads of four threaded holes behind the first variable hydraulic pump manifold block (60); two oil holes behind the first variable hydraulic pump manifold block (60) are matched with two oil holes of a third one-way proportional speed regulating valve (67); the third one-way proportional speed regulating valve (67) is in sealing contact with the back of the first variable hydraulic pump manifold block (60) through a sealing ring; the third one-way proportional speed regulating valve (67) is in threaded connection with the rear part of the first variable hydraulic pump integrated block (60); the left side surface of the first variable hydraulic pump manifold block (60) is provided with four threaded holes matched with four cylindrical holes of the first electro-hydraulic proportional directional valve (58); four oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the left side surface of the first variable hydraulic pump manifold block (60); four oil holes on the left side surface of the first variable hydraulic pump manifold block (60) are matched with four oil holes of the first electro-hydraulic proportional directional valve (58); the first electro-hydraulic proportional directional valve (58) is in sealing contact with the left side surface of the first variable hydraulic pump manifold block (60) through a sealing ring; the first electro-hydraulic proportional directional valve (58) is in threaded connection with the left side face of the first variable hydraulic pump manifold block (60); the right side surface of the first variable hydraulic pump manifold block (60) is provided with four threaded holes matched with four cylindrical holes of the first pilot type proportional relief valve assembly (3); two oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the right side surface of the first variable hydraulic pump manifold block (60); the two oil holes on the right side surface of the first variable hydraulic pump manifold block (60) are matched with the two oil holes of the first pilot type proportional relief valve assembly (3); the first pilot type proportional overflow valve assembly (3) is in sealing contact with the right side surface of the first variable hydraulic pump manifold block (60) through a sealing ring; the first pilot type proportional overflow valve assembly (3) is in threaded connection with the right side face of the first variable hydraulic pump integrated block (60); the first pressure sensor assembly (2) is arranged at the right end of the middle of the upper surface of the first variable hydraulic pump manifold block (60); a first pressure gauge (61) is arranged at the left end of the middle of the upper surface of the first variable hydraulic pump manifold block (60).

3. The automotive pneumatic brake valve and brake cylinder test stand hydraulic drive foot assembly of claim 1, wherein the hydraulic drive right side gear train power assembly (36) comprises:

the hydraulic control system comprises a second motor (17), a second variable hydraulic pump oil suction pipe assembly (18), a third end cover (19), a third flat key (20), a second variable hydraulic pump transmission sleeve (21), a second lubricating oil injection plug (22), a fourth flat key (23), a second variable hydraulic pump support frame (24), a fourth end cover (25), a second variable hydraulic pump (26), a second variable hydraulic pump oil suction pipe assembly (27), a second pilot type proportional overflow valve assembly (28), a second pressure sensor assembly (29), a second hydraulic system oil return pipe assembly (30), a second pressure gauge (31), a second variable hydraulic pump integrated block (32), a first one-way proportional speed regulating valve (33), a second electro-hydraulic proportional reversing valve (34), a second variable hydraulic pump integrated block base (35), a cooler oil outlet pipe assembly (63), a cooler oil inlet pipe assembly (65), The brake system comprises a second three-way joint (66), a fourth one-way proportional speed regulating valve (74), an air brake valve performance test bed (75), an air brake valve reliability and durability test bed (76), a brake cylinder performance test bed (77), a brake cylinder reliability and durability test bed (78), a cooler water outlet pipe assembly (79), a cooler water inlet pipe assembly (80), a cooler assembly (81) and an electric control cabinet (82); wherein:

the second motor (17) is arranged on the right side of the front part of a test bed hydraulic driving base (47) in the hydraulic driving base device (46) and is positioned between a second variable hydraulic pump support frame (24) and a first motor (13) in the hydraulic driving left side gear train power assembly (1); the second motor (17) is in threaded connection with a hydraulic driving base (47) of the test bed; the second variable hydraulic pump support frame (24) is formed into a whole by a horizontal cylinder, two vertical plates with the same thickness and the same geometric dimension, and two L-shaped plates with the same thickness and the same geometric dimension; a vertical thread through hole is arranged in the middle of the upper part of the outer part of a horizontal cylinder in a second variable hydraulic pump support frame (24); a vertical thread through hole in the middle of the upper part of the outer part of a horizontal cylinder of a second variable hydraulic pump support frame (24) is matched with a thread of a second lubricating oil injection plug (22); two coaxial cylindrical holes with different diameters are arranged in a horizontal cylinder of a second variable hydraulic pump support frame (24), wherein the diameter of the left cylindrical hole is larger than that of the right cylindrical hole; a rectangular groove matched with the fourth flat key (23) is arranged above a right cylindrical hole in the horizontal cylinder of the second variable hydraulic pump support frame (24); six horizontal threaded holes are uniformly distributed on the left end surface and the right end surface around the axial lead of two horizontal cylindrical holes of a second variable hydraulic pump support frame (24); the axial lead of two horizontal cylindrical holes of a second variable hydraulic pump support frame (24) is coaxial with the axial lead of a circle formed by the axial leads of two groups of six horizontal threaded holes at the left end and the right end; six horizontal threaded holes in the left end face of a horizontal cylinder of a second variable hydraulic pump support frame (24) are matched with six horizontal cylindrical holes in a third end cover (19); six horizontal threaded holes in the right end face of a horizontal cylinder of a second variable hydraulic pump support frame (24) are matched with six horizontal cylindrical holes in a fourth end cover (25); a horizontal cylindrical hole is arranged in the middle of the third end cover (19) and matched with a cylinder of an output shaft of the second motor (17); a horizontal cylindrical hole is formed in the middle of the fourth end cover (25) and is equal to a right cylindrical hole of the second variable hydraulic pump support frame (24); a horizontal cylindrical hole in the middle of the fourth end cover (25) is matched with a cylinder of a driving shaft of a second variable hydraulic pump (26); the outer part of the transmission sleeve (21) of the second variable hydraulic pump is a horizontal cylinder; two coaxial cylindrical holes with different diameters are arranged in a horizontal cylinder of a second variable hydraulic pump transmission sleeve (21), wherein the diameter of the cylindrical hole on the left side is larger than that of the cylindrical hole on the right side; a flat key groove matched with the third flat key (20) is arranged in the cylindrical hole on the left side of the second variable hydraulic pump transmission sleeve (21); a flat key groove matched with the fourth flat key (23) is arranged in the cylindrical hole on the right side of the second variable hydraulic pump transmission sleeve (21); the axial lead of a horizontal cylinder of a second variable hydraulic pump transmission sleeve (21) is coaxial with the axial leads of two coaxial cylindrical holes with different diameters; the second variable hydraulic pump transmission sleeve (21) is arranged in a cylindrical hole on the left side of the second variable hydraulic pump support frame (24), and the right end of the second variable hydraulic pump transmission sleeve (21) is in contact with the left end of the cylindrical hole on the right side of the second variable hydraulic pump support frame (24); the third end cover (19) is arranged on the cylinder of the output shaft of the second motor (17); the third flat key (20) is arranged in a cylindrical flat key groove of an output shaft of the second motor (17); after the third end cover (19), the third flat key (20) and the second motor (17) are assembled, the flat key groove in the left cylindrical hole of the second variable hydraulic pump transmission sleeve (21) is arranged on the cylinder of the output shaft of the second motor (17) along the third flat key (20); the third end cover (19) is in threaded connection with a second variable hydraulic pump support frame (24); the fourth end cover (25) is arranged on a cylinder of a driving shaft of the second variable hydraulic pump (26); the fourth flat key (23) is arranged in a flat key groove of a cylinder of a driving shaft of the second variable hydraulic pump (26); after the fourth end cover (25), the fourth flat key (23) and the second variable hydraulic pump (26) are assembled, the fourth flat key (23) on the cylinder of the drive shaft of the second variable hydraulic pump (26) is arranged on the second variable hydraulic pump support frame (24) along the flat key grooves of the second variable hydraulic pump support frame (24) and the second variable hydraulic pump transmission sleeve (21); a connecting plate of a second variable hydraulic pump (26) is in threaded connection with a second variable hydraulic pump supporting frame (24) through a fourth end cover (25); the second variable hydraulic pump support frame (24) is in threaded connection with a test bed hydraulic drive base (47); an oil suction port and an oil pressing port of the second variable hydraulic pump (26) are respectively provided with a pipe joint and are sealed by sealing rings; the left end of an oil suction pipe assembly (18) of a second variable hydraulic pump is connected with a pipe joint at the right end of a first three-way joint (16) in a hydraulic drive left gear train power assembly (1) through a pipe joint; the right end of the oil suction pipe assembly (18) of the second variable hydraulic pump is connected with the oil suction pipe joint of the second variable hydraulic pump (26) through a pipe joint; the left end of a second variable hydraulic pump oil pressing pipe assembly (27) is connected with a pipe joint of an oil pressing port of a second variable hydraulic pump (26) through a pipe joint; the right end of a second variable hydraulic pump oil pipe assembly (27) is connected with a pipe joint at the left end of a second variable hydraulic pump integrated block base (35) through a pipe joint; the left end of a second hydraulic system oil return pipe assembly (30) is connected with a pipe joint at the right end of a second three-way joint (66) through a pipe joint; the front end of the right side of the second hydraulic system oil return pipe assembly (30) is connected with a pipe joint at the rear end of the second variable hydraulic pump manifold block base (35) through a pipe joint; the second variable hydraulic pump integrated block base (35) is a cuboid; a pipe joint is arranged in the middle of the left end of the second variable hydraulic pump integrated block base (35); the middle pipe joint at the left end of the second variable hydraulic pump integrated block base (35) is matched with the pipe joint at the right end of the second variable hydraulic pump pressure oil pipe assembly (27); a pipe joint is arranged in the middle of the rear side of the second variable hydraulic pump manifold block base (35); a middle pipe joint behind a second variable hydraulic pump manifold block base (35) is matched with the front end of the right side of a second hydraulic system oil return pipe assembly (30); two pipe joints are arranged at the right end of the second variable hydraulic pump integrated block base (35); a pipe joint at the front end of the right end of the second variable hydraulic pump integrated block base (35) is matched with a pipe joint at the left end of the upper side of a sixth high-pressure oil pipe assembly (73) in a hydraulic driving base device (46); the pipe joint at the rear right end of the second variable hydraulic pump manifold block base (35) is matched with the pipe joint at the left upper end of a fourth high-pressure oil pipe assembly (71) in the hydraulic drive base device (46); a pipe joint in the front of the right end of the second variable hydraulic pump manifold block base (35) is connected with a pipe joint in the left end of the upper side of the sixth high-pressure oil pipe assembly (73); a pipe joint at the rear of the right end of the second variable hydraulic pump manifold block base (35) is connected with a pipe joint at the left end of the upper side of a fourth high-pressure oil pipe assembly (71); four corners of the second variable hydraulic pump manifold block base (35) are respectively provided with a vertical cylindrical hole with the same diameter; the second variable hydraulic pump integrated block (32) is a cuboid; four corners of the second variable hydraulic pump manifold block (32) are respectively provided with a vertical cylindrical hole with the same diameter; four equal-diameter vertical cylindrical holes in four corners of a second variable hydraulic pump manifold block base (35) are matched with four equal-diameter vertical cylindrical holes in four corners of a second variable hydraulic pump manifold block (32); the second variable hydraulic pump integrated block (32) is arranged on the second variable hydraulic pump integrated block base (35); the lower surface of the second variable hydraulic pump manifold block (32) is in sealing contact with the upper surface of a second variable hydraulic pump manifold block base (35) through a sealing ring; the second variable hydraulic pump integrated block (32) and the second variable hydraulic pump integrated block base (35) are in threaded connection with a test bed hydraulic driving base (47); four threaded holes matched with four cylindrical through holes of the first one-way proportional speed regulating valve (33) are formed in the front of the second variable hydraulic pump manifold block (32); two oil holes are formed in a square formed by the axial leads of four threaded holes in the front of the second variable hydraulic pump manifold block (32); the two oil holes in the front of the second variable hydraulic pump manifold block (32) are matched with the two oil holes of the first one-way proportional speed regulating valve (33); the first one-way proportional speed regulating valve (33) is in sealing contact with the front surface of the second variable hydraulic pump integrated block (32) through a sealing ring; the first one-way proportional speed regulating valve (33) is in threaded connection with the front of the second variable hydraulic pump integrated block (32); four threaded holes matched with four cylindrical holes of a fourth one-way proportional speed regulating valve (74) are formed in the rear of the second variable hydraulic pump manifold block (32); two oil holes are formed in a square formed by the axial leads of four threaded holes behind the second variable hydraulic pump manifold block (32); two oil holes behind the second variable hydraulic pump manifold block (32) are matched with two oil holes of a fourth one-way proportional speed regulating valve (74); the fourth one-way proportional speed regulating valve (74) is in sealing contact with the back of the second variable hydraulic pump integrated block (32) through a sealing ring; the fourth one-way proportional speed regulating valve (74) is in threaded connection with the rear part of the second variable hydraulic pump integrated block (32); the right side surface of the second variable hydraulic pump manifold block (32) is provided with four threaded holes matched with four cylindrical holes of the second electro-hydraulic proportional directional valve (34); four oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the right side surface of the second variable hydraulic pump manifold block (32); four oil holes on the right side surface of the second variable hydraulic pump manifold block (32) are matched with four oil holes of the second electro-hydraulic proportional directional valve (34); the second electro-hydraulic proportional directional valve (34) is in sealing contact with the right side surface of the second variable hydraulic pump manifold block (32) through a sealing ring; the second electro-hydraulic proportional directional valve (34) is in threaded connection with the right side face of the second variable hydraulic pump integrated block (32); the left side surface of the second variable hydraulic pump manifold block (32) is provided with four threaded holes matched with four cylindrical holes of the second pilot type proportional relief valve assembly (28); two oil holes are formed in a rectangle formed by the axial leads of the four threaded holes on the left side surface of the second variable hydraulic pump manifold block (32); the two oil holes on the left side surface of the second variable hydraulic pump manifold block (32) are matched with the two oil holes of the second pilot type proportional relief valve assembly (28); the second pilot type proportional overflow valve assembly (28) is in sealing contact with the left side surface of a second variable hydraulic pump manifold block (32) through a sealing ring; the second pilot type proportional relief valve assembly (28) is in threaded connection with the left side face of a second variable hydraulic pump integrated block (32); the second pressure sensor assembly (29) is arranged at the left end of the middle of the upper surface of the second variable hydraulic pump integrated block (32); the second pressure gauge (31) is arranged at the right end in the middle of the upper surface of the second variable hydraulic pump manifold block (32); the air brake valve performance test bed (75) is arranged at the left end of the rear part of the test bed hydraulic drive base (47); four corners of the air brake valve performance test bed (75) are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the test bed hydraulic driving base (47); the air brake valve performance test bed (75) is in threaded connection with a test bed hydraulic drive base (47); the air brake valve reliability and durability test bed (76) is arranged at the rear part of the test bed hydraulic drive base (47), is positioned at the right side of the air brake valve performance test bed (75), and is positioned at the left side of the brake cylinder performance test bed (77); four corners of the air brake valve reliability and durability test bed (76) are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the test bed hydraulic driving base (47); the pneumatic brake valve reliability and durability test bed (76) is in threaded connection with the test bed hydraulic drive base (47); the brake cylinder performance test bed (77) is arranged at the rear part of the test bed hydraulic drive base (47), is positioned at the right side of the air brake valve reliability and durability test bed (76), and is positioned at the left side of the brake cylinder reliability and durability test bed (78); four corners of the brake cylinder performance test bed (77) are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes in the hydraulic drive base (47) of the test bed; the brake cylinder performance test bed (77) is in threaded connection with a test bed hydraulic drive base (47); a brake cylinder reliability and durability test bed (78) is arranged at the right end of the rear part of a test bed hydraulic drive base (47); four corners of a brake cylinder reliability and durability test bed (78) are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on a test bed hydraulic driving base (47); a brake cylinder reliability and durability test bed (78) is in threaded connection with a test bed hydraulic drive base (47); the cooler assembly (81) is arranged at the right end of the middle part of the hydraulic drive base (47) of the test bed; four equal-diameter cylindrical holes of the cooler assembly (81) are matched with four equal-diameter threaded holes in a hydraulic driving base (47) of the test bed; the cooler assembly (81) is in threaded connection with the test bed hydraulic drive base (47); the front end of the cooler oil inlet pipe assembly (65) is connected with a pipe joint at the rear end of the second three-way joint (66) through a pipe joint; the rear end of the cooler oil inlet pipe assembly (65) is connected with an oil inlet pipe joint of the cooler assembly (81) through a pipe joint; the right end of the cooler oil outlet pipe assembly (63) is connected with an oil outlet pipe joint of the cooler assembly (81) through a pipe joint; the left end of the cooler oil outlet pipe assembly (63) is connected with an oil return pipe joint at the back of a hydraulic oil tank assembly (15) in the hydraulic drive left gear train power assembly (1) through a pipe joint; the left end of the cooler water outlet pipe assembly (79) is connected with a water outlet pipe joint of the cooler assembly (81) through a pipe joint; the right end of a cooler water outlet pipe assembly (79) is connected with a cooling water return pipe joint through a pipe joint; the left end of the cooler water inlet pipe assembly (80) is connected with a pipe joint of a water inlet of the cooler assembly (81) through a pipe joint; the right end of the cooler water inlet pipe assembly (80) is connected with a cooling water source pipe joint through a pipe joint; the electrical control cabinet (82) is arranged at the left end of the middle part of the test bed hydraulic drive base (47); four corners of the electrical control cabinet (82) are respectively provided with an equal-diameter cylindrical hole matched with four equal-diameter threaded holes on the hydraulic driving base (47) of the test bed; the electrical control cabinet (82) is in threaded connection with the test bed hydraulic drive base (47).

4. An automotive pneumatic brake valve and brake cylinder test stand hydraulic drive mount assembly as defined in claim 1, wherein the hydraulic drive mount assembly (46) includes:

a first walking wheel bracket (37), a third lubricating oil injection plug (38), a first hydraulic motor (39), a first bush (40), a first walking wheel shaft (41), a first walking wheel (42), a first fixed snap ring (43), a second bush (44), a fourth lubricating oil injection plug (45), a test bed hydraulic drive base (47), a second walking wheel bracket (48), a fifth lubricating oil injection plug (49), a third bush (50), a second fixed snap ring (51), a second walking wheel (52), a second walking wheel shaft (53), a fourth bush (54), a second hydraulic motor (55), a sixth lubricating oil injection plug (56), a first high-pressure oil pipe assembly (68), a second high-pressure oil pipe assembly (69), a third high-pressure oil pipe assembly (70), a fourth high-pressure oil pipe assembly (71), a fifth high-pressure oil pipe assembly (72), a sixth high-pressure oil pipe assembly (73), A seventh lubricating oil injection plug (83), a third hydraulic motor (84), a fifth bush (85), a third traveling wheel shaft (86), a third traveling wheel (87), a third fixed snap ring (88), a sixth bush (89), an eighth lubricating oil injection plug (90), a third traveling wheel bracket (91), a ninth lubricating oil injection plug (92), a seventh bush (93), a fourth fixed snap ring (94), a fourth traveling wheel (95), a fourth traveling wheel shaft (96), an eighth bush (97), a fourth hydraulic motor (98), a tenth lubricating oil injection plug (99) and a fourth traveling wheel bracket (100); wherein:

the test bed hydraulic drive base (47) is a rectangular steel plate with equal thickness; the left end of the rear part of the upper surface of a hydraulic driving base (47) of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of an air brake valve performance test bed (75) in a hydraulic driving right-side gear train power assembly (36); the left side of the rear part of the upper surface of the test bed hydraulic drive base (47) is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of an air brake valve reliability and durability test bed (76) in a hydraulic drive right-side gear train power assembly (36); four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of a brake cylinder performance test bed (77) in a hydraulic drive right-side gear train power assembly (36) are formed in the right side of the rear part of the upper surface of a test bed hydraulic drive base (47); the right end of the rear part of the upper surface of a test bed hydraulic drive base (47) is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of a test bed (78) for the reliability and durability of a brake cylinder in a hydraulic drive right-side gear train power assembly (36); the middle part of the upper surface of a hydraulic drive base (47) of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of a hydraulic oil tank assembly (15) in a hydraulic drive left gear train power assembly (1); the right end of the middle part of the upper surface of a hydraulic drive base (47) of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of a cooler assembly (81) in a hydraulic drive right-side gear train power assembly (36); the left end of the middle part of the upper surface of a hydraulic drive base (47) of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a base of an electrical control cabinet (82) in a hydraulic drive right-side gear train power assembly (36); the left end of the front part of the upper surface of a hydraulic drive base (47) of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a first variable hydraulic pump integrated block base (57) and a first variable hydraulic pump integrated block (60) in a hydraulic drive left gear train power assembly (1); the left side of the front part of the upper surface of a hydraulic drive base (47) of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a first variable hydraulic pump support frame (7) in a hydraulic drive left gear train power assembly (1); the left side of the front part of the upper surface of a hydraulic drive base (47) of the test bed is provided with four kidney holes matched with four equal-diameter cylindrical holes on a base of a first motor (13) in a hydraulic drive left gear train power assembly (1); four kidney holes matched with four equal-diameter cylindrical holes in a base of a second motor (17) in the hydraulic drive right-side gear train power assembly (36) are formed in the right side of the front part of the upper surface of the test bed hydraulic drive base (47); four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in a second variable hydraulic pump support frame (24) in a hydraulic drive right-side gear train power assembly (36) are formed in the right side of the front part of the upper surface of a test bed hydraulic drive base (47); the right end of the front part of the upper surface of a hydraulic drive base (47) of the test bed is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes on a second variable hydraulic pump integrated block (32) in a hydraulic drive right-side gear train power assembly (36) and a second variable hydraulic pump integrated block base (35); the right front angle of the upper surface of the test bed hydraulic drive base (47) is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in the first travelling wheel bracket (37); a round counter bore matched with a cylinder at the upper end of the first travelling wheel bracket (37) is arranged at the right front corner of the lower surface of the test bed hydraulic drive base (47); the left front corner of the upper surface of the test bed hydraulic drive base (47) is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in the second walking wheel bracket (48); a round counter bore matched with a cylinder at the upper end of the second walking wheel bracket (48) is arranged at the left front corner of the lower surface of the test bed hydraulic drive base (47); the left rear corner of the upper surface of the test bed hydraulic drive base (47) is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in the third travelling wheel bracket (91); a round counter bore matched with a cylinder at the upper end of the third travelling wheel bracket (91) is arranged at the left rear corner of the lower surface of the test bed hydraulic drive base (47); the right rear angle of the upper surface of the test bed hydraulic drive base (47) is provided with four equal-diameter threaded holes matched with four equal-diameter cylindrical holes in the fourth traveling wheel bracket (100); a round counter bore matched with the cylinder at the upper end of the fourth traveling wheel bracket (100) is arranged at the right rear corner of the lower surface of the test bed hydraulic drive base (47); the first travelling wheel bracket (37) is a whole formed by a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimensions, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimensions, and a vertical plate with arc transition at the lower end of each isosceles trapezoid steel plate; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in a hydraulic driving base (47) of the test bed are uniformly distributed in the round steel plate of the first travelling wheel bracket (37); a horizontal cylindrical hole matched with the cylinders of the first lining (40) and the second lining (44) is respectively arranged on a boss at the lower part of the vertical plate of which the two parallel lower ends of the first travelling wheel bracket (37) adopt arc transition; the axial lead of bosses at the lower parts of two parallel vertical plates of the first travelling wheel bracket (37) is coaxial with the axial leads of the two horizontal cylindrical holes; a horizontal cylindrical hole at the lower part of a left vertical plate of the first travelling wheel bracket (37) is matched with a cylinder of the second lining (44); a horizontal cylindrical hole at the lower part of a vertical plate on the right side of the first travelling wheel bracket (37) is matched with a cylinder of a first lining (40); a vertical threaded hole matched with the thread of the cylinder of the fourth lubricating oil injection plug (45) is formed in a boss on the left side surface of the lower part of the left vertical plate of the first travelling wheel bracket (37); a boss at the lower part of the vertical plate at the right side of the first travelling wheel bracket (37) is provided with a vertical threaded hole matched with the thread of the cylinder of the third lubricating oil injection plug (38); six horizontal threaded holes matched with six horizontal cylindrical holes in a connecting plate of a first hydraulic motor (39) are formed in a right side boss at the lower part of a right vertical plate of the first travelling wheel bracket (37); the axial lead of a horizontal cylindrical hole on a boss on the right side surface of the lower part of a vertical plate on the right side of the first travelling wheel bracket (37) is coaxial with the axial lead of a circle formed by the axial leads of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the first bushing (40); the right vertical cylindrical hole of the first bushing (40) is matched with a vertical threaded hole on a boss at the lower part of a right vertical plate of the first travelling wheel bracket (37); the first bushing (40) is arranged in a boss upper cylindrical hole at the lower part of a vertical plate at the right side of the first travelling wheel bracket (37); a vertical cylindrical hole is formed in the left side of the second bushing (44); the left vertical cylindrical hole of the second bush (44) is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the first travelling wheel bracket (37); the second bush (44) is arranged in a cylindrical hole on a boss at the lower part of a left vertical plate of the first travelling wheel bracket (37); a cylindrical hole internal spline matched with the cylindrical spline of the first walking wheel shaft (41) is arranged on the horizontal axis of the first walking wheel (42); three cylinders with coaxial different diameters are arranged outside the first walking wheel shaft (41), wherein the diameter of the left cylinder is larger than that of the middle cylinder, and the diameter of the middle cylinder is larger than that of the right cylinder; a spline is arranged on the middle cylinder of the first walking wheel shaft (41); an internal spline is arranged inside the right cylinder of the first travelling wheel shaft (41); the axial lead of a spline in the cylindrical hole at the right side of the first travelling wheel shaft (41) is coaxial with the axial lead of a spline on the middle cylinder; a circular groove matched with the first fixed snap ring (43) is formed in the left side of the middle cylindrical spline of the first travelling wheel shaft (41); the right end of the first walking wheel shaft (41) penetrates through the second bush (44), the first fixed clamping ring (43) and the first walking wheel (42) in sequence, and the right end of the first walking wheel shaft (41) extends out of the first bush (40); the first fixed clamping ring (43) is arranged in a circular groove of the first travelling wheel shaft (41), and the left end of the first fixed clamping ring (43) is in contact with the right end of the lower part of the left vertical plate of the first travelling wheel bracket (37); the right end of the left cylinder of the first travelling wheel shaft (41) is contacted with the left end of the lower part of the left vertical plate of the first travelling wheel bracket (37); the first walking wheel (42) is arranged on a middle cylindrical spline of the first walking wheel shaft (41); a fourth lubricating oil injection plug (45) is arranged in a vertical threaded hole on a left side boss at the lower part of a left vertical plate of the first travelling wheel bracket (37); a third lubricating oil injection plug (38) is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the first travelling wheel bracket (37); an output shaft of the first hydraulic motor (39) is inserted into a spline of a right cylindrical hole of the first walking wheel shaft (41); the left end of a connecting plate of a first hydraulic motor (39) is contacted with the right end of the lower part of a vertical plate on the right side of a first travelling wheel bracket (37); a connecting plate of a first hydraulic motor (39) is in threaded connection with the right end of the lower part of a right vertical plate of a first travelling wheel bracket (37); a round steel plate of the first travelling wheel bracket (37) is in threaded connection with the lower surface of the right front corner of the test bed hydraulic drive base (47); a pipe joint at the lower right end of the sixth high-pressure oil pipe assembly (73) is connected with a pipe joint at the left end of the first hydraulic motor (39); the pipe joint at the upper side of the sixth high-pressure oil pipe assembly (73) is connected with the pipe joint at the front end of the right end of a second variable hydraulic pump integrated block base (35) in the hydraulic drive right gear train power assembly (36); the left end pipe joint of the fifth high-pressure oil pipe assembly (72) is connected with the right end pipe joint of the first hydraulic motor (39); a pipe joint at the right end of the fifth high-pressure oil pipe assembly (72) is connected with a pipe joint at the left end of a fourth hydraulic motor (98); the second walking wheel bracket (48) is composed of a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimension, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimension, and the lower ends of the isosceles trapezoid steel plates are integrated by adopting a vertical plate in arc transition; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in a hydraulic driving base (47) of the test bed are uniformly distributed in the round steel plate of the second travelling wheel bracket (48); a horizontal cylindrical hole matched with the cylinders of the third bush (50) and the fourth bush (54) is respectively arranged on a boss at the lower part of the vertical plate of which the two parallel lower ends of the second travelling wheel bracket (48) adopt arc transition; the axial lines of bosses at the lower parts of two parallel vertical plates of the second travelling wheel bracket (48) are coaxial with the axial lines of the two horizontal cylindrical holes; a horizontal cylindrical hole at the lower part of a left vertical plate of the second travelling wheel bracket (48) is matched with a cylinder of a fourth bush (54); a horizontal cylindrical hole at the lower part of a vertical plate on the right side of the second travelling wheel bracket (48) is matched with a cylinder of a third bush (50); a vertical threaded hole matched with the cylinder thread of the sixth lubricating oil injection plug (56) is formed in a boss on the left side surface of the lower part of the left vertical plate of the second travelling wheel bracket (48); a boss at the lower part of a vertical plate at the right side of the second travelling wheel bracket (48) is provided with a vertical threaded hole matched with the cylindrical thread of the fifth lubricating oil injection plug (49); six horizontal threaded holes matched with six horizontal cylindrical holes in a connecting plate of a second hydraulic motor (55) are formed in a boss on the left side face of the lower part of a left vertical plate of the second travelling wheel bracket (48); the axis of a horizontal cylindrical hole on a left side boss at the lower part of a left vertical plate of a second travelling wheel bracket (48) is coaxial with the axis of a circle formed by the axes of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the third bushing (50); the right vertical cylindrical hole of the third bushing (50) is matched with a vertical threaded hole on a boss at the lower part of a right vertical plate of the second travelling wheel bracket (48); the third bush (50) is arranged in a boss upper cylindrical hole at the lower part of a vertical plate at the right side of the second travelling wheel bracket (48); a vertical cylindrical hole is formed in the left side of the fourth bushing (54); the left vertical cylindrical hole of the fourth bush (54) is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the second travelling wheel bracket (48); a fourth bush (54) is arranged in a cylindrical hole on a boss at the lower part of a left vertical plate of the second travelling wheel bracket (48); a cylindrical hole internal spline matched with the cylindrical spline of the second travelling wheel shaft (53) is arranged on the horizontal axis of the second travelling wheel (52); three cylinders with coaxial different diameters are arranged outside the second walking wheel shaft (53), wherein the diameter of the left cylinder is smaller than that of the middle cylinder, and the diameter of the middle cylinder is smaller than that of the right cylinder; a spline is arranged on the middle cylinder of the second walking wheel shaft (53); an internal spline is arranged inside the cylinder on the left side of the second walking wheel shaft (53); the axial lead of a spline in the cylindrical hole at the left side of the second walking wheel shaft (53) is coaxial with the axial lead of a spline shaft on the middle cylinder; a circular groove matched with the second fixed snap ring (51) is formed in the right side of the middle cylindrical spline of the second travelling wheel shaft (53); the left end of a second walking wheel shaft (53) penetrates through a third bush (50), a second fixed clamping ring (51) and a second walking wheel (52) in sequence, and the left end of the second walking wheel shaft (53) extends out of a fourth bush (54); the second fixed clamping ring (51) is arranged in a ring groove of the second travelling wheel shaft (53), and the right end of the second fixed clamping ring (51) is in contact with the left end of the lower part of the vertical plate on the right of the second travelling wheel bracket (48); the left end of the cylinder on the right of the second travelling wheel shaft (53) is in contact with the right end of the lower part of the vertical plate on the right of the second travelling wheel bracket (48); the second travelling wheel (52) is arranged on a cylindrical spline in the middle of the second travelling wheel shaft (53); a sixth lubricating oil injection plug (56) is arranged in a vertical threaded hole on a left side boss at the lower part of a left vertical plate of the second travelling wheel bracket (48); a fifth lubricating oil injection plug (49) is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the second travelling wheel bracket (48); the output shaft of the second hydraulic motor (55) is inserted into the cylindrical spline at the left side of the second walking wheel shaft (53); the right end of a connecting plate of a second hydraulic motor (55) is contacted with the left end of the lower part of a left vertical plate of a second travelling wheel bracket (48); a connecting plate of a second hydraulic motor (55) is in threaded connection with the left end of the lower part of the left vertical plate of the second travelling wheel bracket (48); a round steel plate of a second travelling wheel bracket (48) is in threaded connection with the lower surface of the left front corner of the test bed hydraulic drive base (47); the left end pipe joint at the lower side of the first high-pressure oil pipe assembly (68) is connected with the right end pipe joint of the second hydraulic motor (55); an upper pipe joint of a first high-pressure oil pipe assembly (68) is connected with a front pipe joint at the left end of a first variable hydraulic pump integrated block base (57) in a hydraulic drive left gear train power assembly (1); the right end pipe joint of the second high-pressure oil pipe assembly (69) is connected with the left end pipe joint of the second hydraulic motor (55); the left end pipe joint of the second high-pressure oil pipe assembly (69) is connected with the right end pipe joint of the third hydraulic motor (84); the third travelling wheel bracket (91) is a whole formed by a circular steel plate with equal thickness, two parallel semi-circular arc reinforcing rib plates with equal thickness and identical geometric dimensions, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimensions, and a vertical plate with arc transition at the lower end of each isosceles trapezoid steel plate; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in a hydraulic driving base (47) of the test bed are uniformly distributed in a circular steel plate of the third travelling wheel bracket (91); a horizontal cylindrical hole matched with the cylinders of the fifth bush (85) and the sixth bush (89) is respectively arranged on a boss at the lower part of the vertical plate of which the two parallel lower ends of the third travelling wheel bracket (91) adopt arc transition; the axial lead of bosses at the lower parts of two parallel vertical plates of a third travelling wheel bracket (91) is coaxial with the axial leads of the two horizontal cylindrical holes; a horizontal cylindrical hole at the lower part of a left vertical plate of a third travelling wheel bracket (91) is matched with a cylinder of a sixth lining (89); a horizontal cylindrical hole at the lower part of a vertical plate at the right side of the third travelling wheel bracket (91) is matched with a cylinder of a fifth bush (85); a vertical threaded hole matched with the cylindrical thread of the eighth lubricating oil injection plug (90) is formed in a boss on the left side face of the lower part of a left vertical plate of the third travelling wheel bracket (91); a boss at the lower part of the vertical plate at the right side of the third travelling wheel bracket (91) is provided with a vertical threaded hole matched with the cylindrical thread of the seventh lubricating oil injection plug (83); six horizontal threaded holes matched with six horizontal cylindrical holes in a connecting plate of a third hydraulic motor (84) are formed in a right side boss at the lower part of a right vertical plate of a third travelling wheel bracket (91); the axial lead of a horizontal cylindrical hole on a boss on the right side surface of the lower part of a vertical plate on the right side of a third travelling wheel bracket (91) is coaxial with the axial lead of a circle formed by the axial leads of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the fifth bush (85); the right vertical cylindrical hole of the fifth bush (85) is matched with a vertical threaded hole on a boss at the lower part of a vertical plate at the right of the third travelling wheel bracket (91); a fifth bush (85) is arranged in a boss upper cylindrical hole at the lower part of a vertical plate at the right side of the third travelling wheel bracket (91); a vertical cylindrical hole is formed in the left side of the sixth bushing (89); the left vertical cylindrical hole of the sixth bushing (89) is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of a third travelling wheel bracket (91); a sixth bushing (89) is arranged in a boss upper cylindrical hole at the lower part of a left vertical plate of a third travelling wheel bracket (91); a cylindrical hole internal spline matched with the cylindrical spline of the third travelling wheel shaft (86) is arranged on the horizontal axis of the third travelling wheel (87); three cylinders with coaxial different diameters are arranged outside the third travelling wheel shaft (86), wherein the diameter of the left cylinder is larger than that of the middle cylinder, and the diameter of the middle cylinder is larger than that of the right cylinder; a spline is arranged on the middle cylinder of the third travelling wheel shaft (86); an internal spline is arranged inside the right cylinder of the third travelling wheel shaft (86); the axial lead of a spline in a cylindrical hole at the right side of the third travelling wheel shaft (86) is coaxial with the axial lead of a spline on the middle cylinder; a circular groove matched with the third fixed snap ring (88) is formed in the left side of the middle cylindrical spline of the third travelling wheel shaft (86); the right end of a third travelling wheel shaft (86) penetrates through a sixth bush (89), a third fixed snap ring (88) and a third travelling wheel (87) in sequence, and the right end of the third travelling wheel shaft (86) extends out of a fifth bush (85); a third fixed clamping ring (88) is arranged in a circular groove of a third travelling wheel shaft (86), and the left end of the third fixed clamping ring (88) is contacted with the right end of the lower part of a left vertical plate of a third travelling wheel bracket (91); the right end of the left cylinder of the third travelling wheel shaft (86) is contacted with the left end of the lower part of the left vertical plate of the third travelling wheel bracket (91); a third travelling wheel (87) is arranged on a middle cylindrical spline of a third travelling wheel shaft (86); the eighth lubricating oil injection plug (90) is arranged in a vertical threaded hole on a left side boss at the lower part of a left vertical plate of the third travelling wheel bracket (91); a seventh lubricating oil injection plug (83) is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the third travelling wheel bracket (91); an output shaft of a third hydraulic motor (84) is inserted into a right cylindrical spline of a third walking wheel shaft (86); the left end of a connecting plate of a third hydraulic motor (84) is contacted with the right end of the lower part of a vertical plate on the right of a third travelling wheel bracket (91); a connecting plate of a third hydraulic motor (84) is in threaded connection with the right end of the lower part of a right vertical plate of a third travelling wheel bracket (91); a round steel plate of a third travelling wheel bracket (91) is in threaded connection with the lower surface of the left rear corner of the test bed hydraulic drive base (47); the lower right pipe joint of the third high-pressure oil pipe assembly (70) is connected with the left pipe joint of the third hydraulic motor (84); an upper pipe joint of a third high-pressure oil pipe assembly (70) is connected with a rear pipe joint at the left end of a first variable hydraulic pump integrated block base (57) in a hydraulic drive left gear train power assembly (1); the left end pipe joint of the second high-pressure oil pipe assembly (69) is connected with the right end pipe joint of the third hydraulic motor (84); the right end pipe joint of the second high-pressure oil pipe assembly (69) is connected with the left end pipe joint of the second hydraulic motor (55); the fourth traveling wheel bracket (100) is a whole composed of a circular steel plate with equal thickness, two parallel semicircular arc reinforcing rib plates with equal thickness and identical geometric dimension, two parallel isosceles trapezoid steel plates with equal thickness and identical geometric dimension, and a vertical plate with arc transition at the lower end of each isosceles trapezoid steel plate; four equal-diameter cylindrical holes matched with four equal-diameter threaded holes in a hydraulic driving base (47) of the test bed are uniformly distributed in the round steel plate of the fourth traveling wheel bracket (100); a horizontal cylindrical hole matched with the cylinders of the seventh bushing (93) and the eighth bushing (97) is respectively formed in bosses at the lower parts of two parallel vertical plates of which the lower ends are in arc transition on the fourth traveling wheel bracket (100); the axial lines of bosses at the lower parts of two parallel vertical plates of a fourth travelling wheel bracket (100) are coaxial with the axial lines of the two horizontal cylindrical holes; a horizontal cylindrical hole at the lower part of a left vertical plate of a fourth traveling wheel bracket (100) is matched with a cylinder of an eighth bushing (97); a horizontal cylindrical hole at the lower part of a right vertical plate of the fourth traveling wheel bracket (100) is matched with a cylinder of a seventh bushing (93); a vertical threaded hole matched with the thread of the cylinder of the plug screw (99) for tenth injection of lubricating oil is formed in a boss on the left side surface of the lower part of the left vertical plate of the fourth travelling wheel bracket (100); a boss at the lower part of a vertical plate at the right side of the fourth traveling wheel bracket (100) is provided with a vertical threaded hole matched with the cylindrical thread of the ninth lubricating oil injection plug (92); six horizontal threaded holes matched with six horizontal cylindrical holes on a connecting plate of a fourth hydraulic motor (98) are formed in a boss on the left side face of the lower part of a vertical plate of a fourth traveling wheel bracket (100); the axial lead of a horizontal cylindrical hole on a left side boss at the lower part of a left vertical plate of a fourth travelling wheel bracket (100) is coaxial with the axial lead of a circle formed by the axial leads of six horizontal threaded holes; a vertical cylindrical hole is formed in the right side of the seventh bushing (93); the right vertical cylindrical hole of the seventh bushing (93) is matched with a vertical threaded hole on a boss at the lower part of a right vertical plate of the fourth travelling wheel bracket (100); a seventh bushing (93) is arranged in a boss upper cylindrical hole at the lower part of a vertical plate at the right side of the fourth travelling wheel bracket (100); a vertical cylindrical hole is formed in the left side of the eighth bushing (97); the left vertical cylindrical hole of the eighth bushing (97) is matched with a vertical threaded hole on a boss at the lower part of a left vertical plate of the fourth travelling wheel bracket (100); the eighth bushing (97) is arranged in a cylindrical hole on a boss at the lower part of a left vertical plate of the fourth travelling wheel bracket (100); a cylindrical hole internal spline matched with the cylindrical spline of the fourth traveling wheel shaft (96) is arranged on the horizontal axis of the fourth traveling wheel (95); three cylinders with different coaxial diameters are arranged outside the fourth walking wheel shaft (96), wherein the diameter of the left cylinder is smaller than that of the middle cylinder, and the diameter of the middle cylinder is smaller than that of the right cylinder; a spline is arranged on the middle cylinder of the fourth walking wheel shaft (96); an internal spline is arranged inside the cylinder on the left side of the fourth travelling wheel shaft (96); the axial lead of a spline in a cylindrical hole on the left side of a fourth travelling wheel shaft (96) is coaxial with the axial lead of a spline on the middle cylinder; a circular groove matched with the fourth fixed snap ring (94) is formed in the right side of the middle cylindrical spline of the fourth travelling wheel shaft (96); the left end of a fourth traveling wheel shaft (96) penetrates through a seventh bushing (93), a fourth fixed snap ring (94) and a fourth traveling wheel (95) in sequence, and the left end of the fourth traveling wheel shaft (96) extends out of an eighth bushing (97); a fourth fixed clamping ring (94) is arranged in a circular groove of a fourth traveling wheel shaft (96), and the right end of the fourth fixed clamping ring (94) is in contact with the left end of the lower part of a right vertical plate of a fourth traveling wheel bracket (100); the left end of a cylinder on the right of a fourth travelling wheel shaft (96) is contacted with the right end of the lower part of a vertical plate on the right of a fourth travelling wheel bracket (100); a fourth traveling wheel (95) is arranged on a cylindrical spline in the middle of a fourth traveling wheel shaft (96); a plug screw (99) for tenth lubricating oil injection is arranged in a vertical threaded hole on a left side boss at the lower part of a left vertical plate of a fourth traveling wheel bracket (100); a ninth lubricating oil injection plug (92) is arranged in a vertical threaded hole on a boss at the lower part of a vertical plate on the right side of the fourth travelling wheel bracket (100); an output shaft of a fourth hydraulic motor (98) is inserted into a cylindrical spline on the left side of a fourth walking wheel shaft (96); the right end of a connecting plate of a fourth hydraulic motor (98) is contacted with the left end of the lower part of a left vertical plate of a fourth travelling wheel bracket (100); a connecting plate of a fourth hydraulic motor (98) is in threaded connection with the left end of the lower part of the left vertical plate of the fourth travelling wheel bracket (100); a round steel plate of a fourth traveling wheel bracket (100) is in threaded connection with the lower surface of the right rear corner of the test bed hydraulic drive base (47); a left end pipe joint at the lower side of the fourth high-pressure oil pipe assembly (71) is connected with a right end pipe joint of a fourth hydraulic motor (98); an upper pipe joint of a fourth high-pressure oil pipe assembly (71) is connected with a rear pipe joint at the right end of a second variable hydraulic pump integrated block base (35) in a hydraulic drive right gear train power assembly (36); a pipe joint at the right end of the fifth high-pressure oil pipe assembly (72) is connected with a pipe joint at the left end of a fourth hydraulic motor (98); and the left end pipe joint of the fifth high-pressure oil pipe assembly (72) is connected with the right end pipe joint of the first hydraulic motor (39).