CN113237650A

CN113237650A - Comprehensive electric spindle reliability loading test device

Info

Publication number: CN113237650A
Application number: CN202110606928.4A
Authority: CN
Inventors: 罗巍; 黄昊; 杨威; 池海东; 杨兆军; 陈传海; 田海龙; 何佳龙
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-08-10

Abstract

The invention discloses a comprehensive electric spindle reliability loading test device, which aims to solve the problem that the prior art can not test and test various reliability indexes of an electric spindle under different conditions, and comprises an electric spindle moving and positioning system, a low-frequency low-speed electric spindle reliability loading test system, a high-frequency high-speed electric spindle reliability loading test system, an electric spindle broach mechanism reliability test system and a ground iron; the electric spindle moving and positioning system is arranged on a ground flat iron through a No. 1 precision ball screw and a No. 2 precision ball screw, the low-frequency low-speed electric spindle reliability loading test system is arranged on the ground flat iron between the No. 1 precision ball screw and the No. 2 precision ball screw, the high-frequency high-speed electric spindle reliability loading test system is arranged on the ground flat iron on the left side of the low-frequency low-speed electric spindle reliability loading test system, and the electric spindle broach mechanism reliability test system is arranged on the ground flat iron on the left side of the high-frequency high-speed electric spindle reliability loading test system.

Description

Comprehensive electric spindle reliability loading test device

Technical Field

The invention relates to a test device, belonging to the technical field of reliability test of mechanical equipment, in particular to a comprehensive electric spindle reliability loading test device.

Background

In recent years, the machine manufacturing industry is developed very rapidly, and the development of a numerical control machine tool as an industrial master machine is more reluctant. The reliability of the electric spindle serving as a key part of the numerical control machine tool directly influences the precision, the stability and the like of the numerical control machine tool, and despite the development of the reliability technology of the electric spindle at home and abroad, certain gap still exists between China and countries with leading reliability technologies such as Japan, America and the like, so that the promotion of the reliability technology research of the electric spindle has great significance for the development of the mechanical manufacturing industry at China.

At present, a plurality of test devices and test methods are available for testing the reliability of the electric spindle in China, and it is worth noting that when reliability tests are performed on the same reliability index of the same electric spindle, the reliability test results of the electric spindle under different conditions may show differences, for example, the loading accuracy of the electric spindle under low-frequency and low-speed simulation conditions is within an error range, but the loading accuracy of the electric spindle under high-frequency and high-speed simulation conditions may exceed an allowable error range. Furthermore, reliability tests are often performed on single performance indexes of a single electric spindle, and the comprehensive performance of the electric spindle cannot be reflected, for example, the loading accuracy of a certain electric spindle under high-frequency and high-speed simulation working conditions is within an allowable error range, however, when the reliability tests are performed on the electric spindle broach mechanism, the reliability performance indexes of the electric spindle, such as broach force, rotation precision and the like, exceed normal threshold values, and the electric spindle still does not meet the requirements of practical engineering application.

Disclosure of Invention

The invention aims to solve the technical problem that the prior art can not test multiple reliability indexes of the electric spindle under different conditions, and provides a full-automatic, multi-working-condition and multi-index comprehensive electric spindle reliability loading test device.

In order to solve the technical problems, the invention is realized by adopting the following technical scheme:

the comprehensive electric spindle reliability loading test device comprises an electric spindle movement positioning system, a low-frequency low-speed electric spindle reliability loading test system, a high-frequency high-speed electric spindle reliability loading test system, an electric spindle broach mechanism reliability test system and a ground iron;

the ground flat iron is a cuboid plate-type casting, T-shaped grooves which are parallel to each other and have the same structure are arranged at the top end of the ground flat iron, a weight-reducing groove is arranged at the bottom end of the ground flat iron, and two cuboid grooves are arranged in the middle of the top end of the ground flat iron;

the electric spindle moving and positioning system is arranged on a ground flat iron through a No. 1 precision ball screw and a No. 2 precision ball screw, the low-frequency low-speed electric spindle reliability loading test system is arranged on the ground flat iron between the No. 1 precision ball screw and the No. 2 precision ball screw, the high-frequency high-speed electric spindle reliability loading test system is arranged on the ground flat iron on the left side of the low-frequency low-speed electric spindle reliability loading test system, and the electric spindle broach mechanism reliability test system is arranged on the ground flat iron on the left side of the high-frequency high-speed electric spindle reliability loading test system; an electric spindle in the electric spindle moving and positioning system, a low-frequency low-speed loading unit in the low-frequency low-speed electric spindle reliability loading test system, a high-frequency high-speed loading unit in the high-frequency high-speed electric spindle reliability loading test system and 8 broach mechanism simulation tool handles with the same structure in the electric spindle broach mechanism reliability test system are perpendicular to the ground iron.

The electric spindle moving and positioning system in the technical scheme further comprises an electric spindle simulation tool handle matching device and a moving gantry; the No. 1 precision ball screw and the No. 2 precision ball screw are symmetrically arranged on the front side and the rear side of the ground flat iron by adopting T-shaped bolts, and the longitudinal symmetrical surfaces of the No. 1 precision ball screw and the No. 2 precision ball screw are parallel to the longitudinal symmetrical surface of the ground flat iron; the movable gantry is mounted on a No. 1 precision ball screw and a No. 2 precision ball screw by bolts through 3 connecting plates at the bottom ends of a front side pillar and a rear side pillar, and a front side screw rod nut seat at the bottom end of a connecting plate at the bottom end of a main pillar in the front side pillar and the rear side pillar of the movable gantry is assembled with a rear side screw rod nut seat and a screw nut on the No. 1 precision ball screw and the No. 2 precision ball screw and is connected and fixed by screws; the electric spindle simulation tool handle matching device is fixedly arranged on a middle cross beam of the movable gantry through a No. 4 precision ball screw in the electric spindle simulation tool handle matching device by adopting a bolt.

The matching device of the simulation tool holder of the electric spindle in the technical scheme further comprises a No. 3 precision ball screw, a unclamping cylinder, a vertical guide rail mounting plate, a spindle water jacket, a spindle newspaper holder and a joint plate; wherein: the No. 3 precision ball screw has the same structure as the No. 4 precision ball screw;

the No. 4 precision ball screw is horizontally and fixedly arranged in the middle of a middle cross beam of the movable gantry by adopting a bolt, the No. 3 precision ball screw is fixed on the vertical guide rail mounting plate by adopting a bolt, a No. 3 guide rail sliding block in the No. 3 precision ball screw is fixedly connected with a joint plate by adopting a screw, and the joint plate provided with the No. 3 precision ball screw is arranged on a No. 4 guide rail sliding block in the No. 4 precision ball screw by adopting a bolt; the electric main shaft is arranged in the main shaft water jacket and fixedly connected by bolts, the main shaft water jacket provided with the electric main shaft is arranged in the main shaft newspaper holder and fixedly connected by bolts, the top end of the electric main shaft is provided with a main shaft unclamping cylinder, and the main shaft newspaper holder is fixedly connected to the lower end of the left side wall of the vertical guide rail mounting plate by bolts.

The movable gantry in the technical scheme is a large-scale portal structural member manufactured by adopting a casting mode, and comprises a front side pillar, a rear side pillar and a middle cross beam, wherein the top ends of the front side pillar and the rear side pillar are vertically connected with the two ends of the middle cross beam into a whole to form the portal structural member; the bottom ends of the front side pillar and the rear side pillar are respectively fixed with 1 group of 3 connecting plates, wherein the connecting plates at the bottom ends of the left auxiliary pillar and the right auxiliary pillar are identical in structure, each group of 3 connecting plates are rectangular plate structural members, each connecting plate is uniformly provided with 4 groups of 16 bolt holes, the 1 group of bolt holes on each connecting plate and the 1 # guide rail sliding block in the 1 # precise ball screw and the 2 # precise ball screw are aligned and concentric with the threaded holes on the 2 # guide rail sliding block, the bottom center of the connecting plate of the main pillar in the front side pillar and the rear side pillar is fixed with a front side screw nut seat and a rear side screw nut seat which are assembled with a1 # screw nut on the 1 # precise ball screw and a 2 # screw nut, a gantry is moved by screws and passes through the front side pillar, each 3 connecting plates at the bottom end of the rear side pillar and the 1 # guide rail sliding block and 12 guide rails with 12 structures on the 1 # precise ball screw and the 2 # precise ball screw No. 2 guide rail sliding blocks with the same structure are fixedly connected.

The low-frequency low-speed electric main shaft reliability loading test system in the technical scheme further comprises a low-frequency low-speed radial force loading device, a low-frequency low-speed torque loading device and a low-frequency low-speed axial force loading device; the low-frequency low-speed radial force loading device is fixed on a ground flat iron through a support plate therein; the low-frequency low-speed loading unit is vertically arranged on the front side of the low-frequency low-speed radial force loading device, the low-frequency low-speed axial force loading device is arranged on the front side of the low-frequency low-speed loading unit, and the low-frequency low-speed torque loading device is arranged on a ground flat iron on the right side of the low-frequency low-speed loading unit through a dynamometer base in the low-frequency low-speed torque loading device; a low-frequency low-speed radial force loading ball socket on the low-frequency low-speed radial force loading device is aligned and concentric with a low-frequency low-speed radial force loading ball head arranged on a low-frequency low-speed loading unit, a dynamometer in the low-frequency low-speed torque loading device is arranged on a dynamometer base, and a transmission shaft of the dynamometer is connected with a No. 1 conical gear on the low-frequency low-speed loading unit through a key; the low-frequency low-speed axial force loading device is symmetrically fixed on a bearing sleeve of the low-frequency low-speed loading unit through a loading fork and 2 lever branchers with the same structure.

The low-frequency low-speed radial force loading device in the technical scheme comprises a radial electro-hydraulic servo loader, a middle force plate, 2 supports with the same structure, a support plate, a low-frequency low-speed radial force loading ball socket and a low-frequency low-speed radial force loading ball head; the device comprises a support plate, 2 supports with the same structure, a middle force plate, a radial electro-hydraulic servo loader and a radial electro-hydraulic servo loader, wherein the support plate is symmetrically arranged at the left end and the right end of the support plate, the bottom ends of the 2 supports with the same structure are connected with the left end and the right end of the support plate through bolts, the middle force plate is arranged at the top ends of the 2 supports with the same structure, the radial electro-hydraulic servo loader and the middle force plate are sequentially in contact connection, and the support plate, the middle force plate and the radial electro-hydraulic servo loader are fixedly connected through bolts; the low-frequency low-speed radial force loading ball socket is arranged on a force sensor at the rightmost end of the radial electro-hydraulic servo loader, and the low-frequency low-speed radial force loading ball head is arranged on a low-frequency low-speed loading unit.

The low-frequency low-speed axial force loading device in the technical scheme comprises an axial electro-hydraulic servo loader, a low-frequency low-speed axial force loading ball head, a low-frequency low-speed axial force loading ball socket, a lever supporting seat, a lever rivet and a loading fork; the axial electrohydraulic servo loader is vertically installed in a rectangular groove arranged in the middle of a ground iron and fixedly connected to the ground iron through a bolt, a lever supporting seat is installed on the ground iron on the left side of the axial electrohydraulic servo loader and fixedly connected through the bolt, a lever is installed on a supporting shaft of the lever supporting seat through a through hole in the middle of the lever supporting seat and rotatably connected, a low-frequency low-speed axial force loading ball head is fixedly connected to the rightmost end of the lever through threads and is concentric with a spherical groove of a low-frequency low-speed axial force loading ball socket fixed to the top end of the axial electrohydraulic servo loader, a loading fork is installed at the leftmost end of the lever, 2 lever pull nails with the same structure are symmetrically installed on the loading fork, and the lever pull nails and the loading fork are rotatably connected.

The low-frequency low-speed loading unit (202) in the technical scheme comprises a bearing upper end cover, a bearing sleeve, a bearing lower end cover, a No. 1 bearing, a No. 1 gasket, a No. 1 locking nut, a No. 1 sleeve, a low-frequency low-speed simulation tool shank, a No. 2 bearing, a bearing retainer ring, a No. 2 gasket, a No. 2 locking nut, a shaft sleeve, a No. 1 conical gear, a No. 2 conical gear and a No. 3 bearing;

the upper end cover of the bearing, the bearing sleeve and the lower end cover of the bearing are sleeved on the low-frequency low-speed simulation tool handle from top to bottom, 2 bearing retainer rings with the same structure, a No. 2 gasket and a No. 2 lock nut are positioned at the inner sides of the upper end cover of the bearing, the bearing sleeve and the lower end cover of the bearing and are sleeved on the low-frequency low-speed simulation tool handle from top to bottom, the bearing retainer rings are positioned between 2 bearings with the same structure, the upper end surfaces and the lower end surfaces of the bearing retainer rings are respectively in contact connection with the lower end surfaces and the upper end surfaces of the outer bearing rings of the No. 2 bearings with the same structure, the No. 2 gasket is arranged between the No. 2 bearing and the No. 2 lock nut positioned below, the upper end surfaces and the lower end surfaces of the No. 2 gasket are respectively in contact connection with the bottom end surfaces of the inner bearing rings of the No. 2 bearings positioned below and the top end surfaces of the No. 2 lock nuts, the top end surfaces of the inner bearing rings of the No. 2 bearings positioned above are in contact connection with the upper shaft shoulder on the low-frequency low-speed simulation tool handle, the No. 2 locking nut is in threaded connection with the low-frequency low-speed simulation tool handle, an inner bearing ring of 2 bearings (202-09) with the same structure is in static fit with the low-frequency low-speed simulation tool handle, an outer bearing ring of 2 bearings with the same structure is in transition fit with a bearing sleeve, and an upper end cover and a lower end cover of each bearing are fixedly connected with the top end and the bottom end of the bearing sleeve respectively through screws;

the bearing 1 is sleeved on the low-frequency low-speed simulation tool handle, the top end face of a bearing ring in the bearing 1 is in contact connection with a shaft shoulder at the middle position of the low-frequency low-speed simulation tool handle, the bevel gear 1 is sleeved on the low-frequency low-speed simulation tool handle and is in key connection with the low-frequency low-speed simulation tool handle, the top end face of the bevel gear 1 is in contact connection with the shaft shoulder at the lower end position of the low-frequency low-speed simulation tool handle, the shaft sleeve is arranged between the bearing 1 and the bevel gear 1, a gasket 1 and a locking nut 1 are arranged below the bevel gear 1, and the bearing 1, the bevel gear; no. 2 conical gear and No. 3 bearing suit are on the transmission shaft of dynamometer machine in the low frequency low-speed moment of torsion loading device, and No. 1 cover barrel suit is on the transmission shaft of dynamometer machine between No. 2 conical gear and No. 3 bearing, and the contact connection is in proper order between the three, is the meshing connection between No. 1 conical gear and No. 2 conical gear.

The high-frequency high-speed motorized spindle reliability loading test system in the technical scheme further comprises a high-frequency high-speed radial mean force loading device, a high-frequency high-speed radial amplitude force loading device, a drag torque loading device and a high-frequency high-speed axial force loading device; the high-frequency high-speed radial mean force loading device is fixed on a ground flat iron through a mean electric cylinder support seat and a bolt, the high-frequency high-speed radial amplitude force loading device is arranged on the right side of the high-frequency high-speed radial force mean force loading device and is fixedly connected with the ground flat iron through a bolt of an amplitude vibration table, the high-frequency high-speed loading unit is arranged between the high-frequency high-speed radial mean force loading device and the high-frequency high-speed radial amplitude force loading device, a No. 1 pull nail in the high-frequency high-speed radial mean force loading device is fixedly arranged on the left side of a bearing sleeve in the high-frequency high-speed loading unit, a radial amplitude force loading ball socket in the high-frequency high-speed radial amplitude force loading device and a high-frequency high-speed loading unit stress ball head on the right side of the high-frequency high-speed loading unit are assembled and concentrically aligned, and the high-frequency high-speed axial force loading device is arranged right below the high-frequency high-speed loading unit, the upper end of the high-frequency high-speed axial force loading device is fixedly connected with the front side and the rear side of a bearing sleeve in the high-frequency high-speed axial force loading device through 2 axial force bearing lug assemblies with the same structure; the counter-dragging torque loading device is located between 2 guide post supporting seats with the same structure, the counter-dragging torque loading device is clamped by a counter-dragging electric main shaft and fixedly connected with a groove in the ground iron through a bolt, and a coupler at the top end of the counter-dragging torque loading device is connected with a stepped shaft at the lower end of a high-frequency high-speed simulation tool handle in a high-frequency high-speed loading unit in a matched mode.

The high-frequency high-speed radial mean force loading device in the technical scheme comprises a mean value electric cylinder, a mean value electric cylinder supporting seat, an electric cylinder connecting sleeve, a force transducer, a loading steel wire rope, a No. 1 pull nail and a No. 2 pull nail; the device is characterized in that the mean value electric cylinder is installed on a supporting flat plate in a mean value electric cylinder supporting seat, meanwhile, the right side of the mean value electric cylinder is fixed on a supporting wall in the mean value electric cylinder supporting seat through screws, the right end of a telescopic shaft of the mean value electric cylinder is inserted into a through hole in the upper end of the supporting wall in the mean value electric cylinder supporting seat and then is assembled and connected with a threaded hole in the left end of an electric cylinder connecting sleeve, a short screw rod in the right side of the electric cylinder connecting sleeve is assembled and connected with a threaded hole in the left side of a force sensor, a threaded hole in the right end of the force sensor is assembled and connected with a short screw rod in the left side of a pull nail No. 2, and the left end and the right end of a loading steel wire rope respectively penetrate through central through holes of the pull nail No. 2 and the pull nail No. 1 and then are fixedly connected to form a steel wire rope closed ring.

The high-frequency high-speed axial force loading device in the technical scheme further comprises 2 guide post supporting seats with the same structure, an axial force sensor, 2 bifurcations with the same structure, a push plate, a nut, a pull rod (305-10), a high-frequency high-speed axial force loading electric cylinder, 4 guide post fixing sleeves with the same structure, a supporting plate, 2 push plate guide sleeves with the same structure, 2 push plate guide posts with the same structure, 2 top wheels with the same structure and 2 steel pins with the same structure; the device comprises 2 guide post supporting seats with the same structure, 2 push plate guide posts with the same structure, 4 guide post fixing sleeves with the same structure and a bolt are symmetrically arranged in semi-cylindrical grooves at the upper end and the middle part of the 2 guide post supporting seats with the same structure, a supporting plate is sleeved on the 2 push plate guide posts with the same structure through the 2 push plate guide sleeves with the same structure, an axial force sensor is arranged at the center of the top end face of the supporting plate and fixed through the bolt, the push plate is fixed at the center of the top end of the axial force sensor through the bolt, the bottom ends of 2 loading forks with the same structure are fixed at the front part and the rear part of the top end of the push plate through the bolt, the upper ends of the 2 loading forks with the same structure are rotatably connected with 2 top wheels with the same structure through 2 steel pins with the same structure, and 2 axial stress ear assemblies with the same structure are sleeved at the upper ends of the 2 loading forks with the same structure, meanwhile, 4 steel wire ropes with the same structure in 2 axial stress lug assemblies with the same structure are positioned above and below 2 top wheels with the same structure; the high-frequency high-speed axial force loading electric cylinder is arranged below the right lower corner of the supporting plate, the lower end of the pull rod is in threaded connection with the output end of the telescopic shaft of the high-frequency high-speed axial force loading electric cylinder, and the upper end of the pull rod is inserted into the bolt hole in the right lower corner of the supporting plate and is locked and fixed by the locking nut.

The reliability test system of the electric main shaft broach mechanism in the technical scheme also comprises 8 balancing weights, 8 tool shank mounting seats with the same structure, 8 dynamometers with the same structure, a gear mounting seat, a top plate, 2 top plate guide sleeves with the same structure, 2 top plate guide posts with the same structure, a speed reducing motor, an electric cylinder, 4 guide post fixing sleeves with the same structure, a base, 4 supporting plate guide posts with the same structure, a supporting plate, 4 guide post anti-skid sleeves with the same structure and a turntable; the base is fixed on a ground flat iron by bolts, the bottom ends of 4 supporting plate guide posts with the same structure are arranged at the four corners of the base, the 4 supporting plate guide posts with the same structure are vertical to the base, 4 guide post fixing sleeves with the same structure are sleeved at the lower ends of the 4 supporting plate guide posts with the same structure, and the 4 guide post fixing sleeves with the same structure are fixedly connected to the base by bolts; the supporting plate is sleeved on 4 supporting plate guide posts with the same structure through guide post anti-skid sleeves arranged at four corners; the gear mounting base is rotatably connected with the center of the supporting plate through a supporting shaft, the rotary table is mounted at the top end of the supporting shaft, the gear mounting base and the rotary table are in key connection, 8 tool handles with the same structure are mounted in 8 circular step through holes in the rotary table through 8 tool handle mounting bases with the same structure, 8 balancing weights are sleeved on the 8 tool handles with the same structure, and 8 dynamometers with the same structure are mounted in threaded holes in the centers of the bottom ends of the 8 tool handles with the same structure through threaded connection; the speed reducing motor is arranged below the supporting plate and is fixedly connected with the supporting plate by screws, a power output shaft of the speed reducer is inserted into the small through hole of the supporting plate and the inner ring hole of the bearing, and the power output shaft of the speed reducer is connected with a pinion in the gear mounting seat by keys; the electric cylinder is arranged on the base right below the center of the supporting plate, the telescopic shaft of the electric cylinder is fixedly connected with the center of the rectangular flat plate type top plate, the two top plate guide columns with the same structure are fixedly connected with the front end and the rear end of the top plate through bolts, and the two top plate guide columns with the same structure are arranged in 2 guide sleeves with the same structure on the electric cylinder in a sliding connection mode.

Compared with the prior art, the invention has the beneficial effects that:

1. the full-automatic, multi-working-condition and multi-index comprehensive electric spindle reliability loading test device disclosed by the invention is automatically controlled by automation equipment in the whole process, reliability test processes such as accurate positioning of the electric spindle, centering of the electric spindle, tool changing of the electric spindle, loading of the electric spindle and the like can be completed by the automation equipment, the time of the experiment processes such as spindle adjustment and the like can be greatly shortened, the device has the advantages of quick response, high loading measurement precision, high efficiency and the like, and meanwhile, reliable support is provided for the accuracy and the richness of data;

2. the fully-automatic multi-working-condition multi-index comprehensive electric spindle reliability loading test device can establish a production line equivalent to an electric spindle test, and can test the reliability performance parameters of the same electric spindle sample under different simulation working conditions such as low frequency, low speed, high frequency, high speed, drag loading and the like according to the same performance index, so that the reliability performance index parameters of the electric spindle under different simulation working conditions can be obtained, and the defect that most of the existing electric spindle reliability test devices cannot perform reliability tests on the same index of the electric spindle under different simulation working conditions can be overcome;

3. the fully-automatic multi-working-condition multi-index comprehensive electric spindle reliability loading test device can simulate different working conditions to perform reliability tests of various reliability performance indexes on an electric spindle under different conditions, such as testing reliability performance index parameters of loading accuracy on the electric spindle under low-frequency and low-speed conditions, testing reliability performance index parameters of loading accuracy and dragging rotation accuracy on the electric spindle under high-frequency and high-speed conditions, and testing reliability performance index parameters of broach force, average failure rate and the like on the electric spindle under the electric spindle broach mechanism reliability test condition, so that the comprehensive performance index parameters of the electric spindle can be obtained under the test device;

4. the full-automatic multi-working-condition multi-index comprehensive electric spindle reliability loading test device can acquire data with richness and coupling for reliability performance indexes of an electric spindle in a test process, and creatively provides a method for acquiring reliability data for researching influence of coupling cross among multiple factors on the reliability performance of the electric spindle.

Drawings

The invention is further described with reference to the accompanying drawings in which:

FIG. 1 is an axonometric projection view of the structure of a full-automatic, multi-condition, multi-index comprehensive motorized spindle reliability loading test device according to the present invention;

FIG. 2 is an axonometric projection view of the structure of the motorized spindle mobile positioning system employed in the fully automatic, multi-condition, multi-index comprehensive motorized spindle reliability loading test device of the present invention;

FIG. 3 is a disassembled perspective view of the electric spindle simulation tool holder matching device structure used in the electric spindle movement positioning system according to the present invention;

FIG. 4 is an isometric view of the No. 4 precision ball screw structure employed in the motorized spindle movement positioning system of the present invention;

FIG. 5 is an axonometric view of the structure of a low-frequency low-speed motorized spindle reliability loading test system employed in the fully automatic, multi-condition, multi-index comprehensive motorized spindle reliability loading test apparatus according to the present invention;

FIG. 6 is a front view of the low frequency low speed motorized spindle reliability loading test system of the present invention;

FIG. 7 is a cross-sectional view of the left side view of the low frequency low speed loading unit in the low frequency low speed motorized spindle reliability loading test system according to the present invention;

FIG. 8 is a cross-sectional view of a lever support seat in the low frequency low speed motorized spindle reliability loading test system of the present invention;

FIG. 9 is an axonometric view of the structure of the high-frequency high-speed motorized spindle reliability loading test system employed in the fully automatic, multi-condition, multi-index comprehensive motorized spindle reliability loading test apparatus according to the present invention;

FIG. 10 is an axonometric projection view of the structure of the high-frequency high-speed radial force mean value loading device in the high-frequency high-speed electric spindle reliability loading test system according to the present invention;

FIG. 11 is a front view of the structure of the high-frequency high-speed loading unit in the high-frequency high-speed electric spindle reliability loading test system according to the present invention

FIG. 12 is an axonometric projection view of the structure of the high-frequency high-speed radial force amplitude loading device in the high-frequency high-speed electric spindle reliability loading test system according to the present invention;

FIG. 13 is an axonometric view of the structure of the counter-dragging torque loading device in the high-frequency high-speed electric spindle reliability loading test system according to the present invention;

FIG. 14 is an axonometric view of the structure of the high-frequency high-speed axial force loading device in the high-frequency high-speed electric spindle reliability loading test system according to the present invention;

FIG. 15 is an exploded perspective view of the force transfer device of the high frequency and high speed axial force loading device in the high frequency and high speed electrical spindle reliability loading test system according to the present invention;

FIG. 16 is a cross-sectional view of a force transfer device in a high-frequency high-speed axial force loading device in the high-frequency high-speed motorized spindle reliability loading test system according to the present invention;

FIG. 17 is an axonometric view of the structural components of a reliability testing system of an electric spindle broach mechanism adopted in the fully automatic, multi-working-condition and multi-index comprehensive electric spindle reliability loading testing device of the present invention;

FIG. 18 is a cross-sectional view of the structural components of the gear mounting seat in the reliability testing system of the electric spindle broach mechanism according to the present invention;

FIG. 19 is a cross-sectional view of the structural components of a tool holder mounting seat in the reliability testing system for an electric spindle broach mechanism according to the present invention;

in the figure: 1. an electric spindle moving and positioning system, a No. 101-A.1 precision ball screw, a No. 101-B.2 precision ball screw, 102, an electric spindle simulation tool shank matching device, a No. 102-A.3 precision ball screw, a No. 102-B.4 precision ball screw, a No. 102-B-01.4 motor, a No. 102-B-02.4 screw mounting seat, a No. 102-B-03.4 guide rail sliding block, a No. 102-B-04.4 screw nut, a No. 102-B-05.4 screw, a No. 102-B-06.4 guide rail, a No. 102-B-07.4 base, a No. 102-B-08.4 grating ruler, a No. 102-B-09.4 grating ruler reading head, a No. 102-B-10.4 reading head connecting plate, a No. 102-B-11.4 bearing seat, a No. 102-01 tool striking cylinder, a No. 102-02 vertical guide rail mounting plate, 102-03 spindle water jacket, 102-04 spindle clamp, 102-05 electric spindle, 102-06 joint plate, 103 moving gantry, 2 low-frequency low-speed electric spindle reliability loading test system, 201 low-frequency low-speed radial force loading device, 201-01 radial electrohydraulic servo loader, 201-02 intermediate force plate, 201-03 bracket, 201-04 support plate, 201-05 low-frequency low-speed radial force loading ball socket, 201-06 low-frequency low-speed radial force loading ball head, 202 low-frequency low-speed loading unit, 202-01 bearing upper end cover, 202-02.1 bearing sleeve, 202-03 bearing lower end cover, 202-04.1 bearing, 202-05.1 gasket, 202-06.1 locking nut, 202-07.1 sleeve, 202-08 low-frequency low-speed simulation, 202-09.2 bearing, 202-10 bearing retainer ring, 202-11.2 gasket, 202-12.2 lock nut, 202-13 shaft sleeve, 202-14.1 conical gear, 202-15.2 conical gear, 202-16.3 bearing, 203 low-frequency low-speed torque loading device, 203-01 dynamometer, 203-02 dynamometer base, 204 low-frequency low-speed axial force loading device, 204-01 axial electrohydraulic servo loader, 204-02 low-frequency low-speed axial force loading ball head, 204-03 low-frequency low-speed axial force loading ball socket, 204-04 lever support base, 204-04-01 support base, 204-04-02.4 bearing, 204-04-03 fixed end cover, 204-04-04.3 gasket, 204-04-05 support shaft, 204-04-06.3 number locking nut, 204-04-07.2 number sleeve, 204-05 number lever, 204-06 number lever pull nail, 204-07 number loading bifurcation, 3 number high frequency high speed electric main shaft reliability loading test system, 301 number high frequency high speed radial mean force loading device, 301-01 number mean electric cylinder, 301-02 number mean electric cylinder supporting seat, 301-03 number electric cylinder connecting sleeve, 301-04 number force transducer, 301-05 number loading steel wire rope, 301-06.1 number pull nail, 301-07.2 number pull nail, 302 number high frequency high speed loading unit, 302-01.2 number bearing sleeve, 303 number high frequency high speed radial amplitude force loading device, 303-01 number radial amplitude force loading ball socket, 303-02 number loading rod, 303-03 number nut, 303-04 number amplitude vibration table, 303-05 amplitude sensor, 303-06 high-frequency high-speed loading unit stress ball head, 304 drag torque loading device, 304-01 drag electric main shaft clamp, 304-02 drag torque loading electric main shaft, 304-03 coupling, 304-04 high-frequency high-speed simulation tool handle, 305 high-frequency high-speed axial force loading device, 305-01 guide column supporting seat, 305-02 axial force sensor, 305-03 axial stress lug, 305-04 tension nail, No. 305-05.4 lock nut, 305-06 steel wire rope, 305-07 loading fork, 305-08 push plate, 305-09 nut, 305-10 pull rod, 305-11 high-frequency high-speed axial force loading electric cylinder, 305-12 guide column fixing sleeve, 305-13 supporting plate, 305-14 parts of a push plate guide sleeve, 305-15 parts of a push plate guide column, 305-16 parts of a top wheel, 305-17 parts of a steel pin, 4 parts of an electric spindle broach mechanism reliability test system, 401 parts of a balancing weight, 402 parts of a broach mechanism simulation tool holder, 403 parts of a tool holder mounting seat, 403-01 parts of a bearing end cover, 403-02 parts of a sealing ring, 403-03.5 parts of a bearing, 403-04.3 parts of a sleeve, 404 parts of a broach force dynamometer, 405 parts of a gear mounting seat, 405-01 parts of a support shaft, 405-02 parts of a bull gear locking nut, 405-03.4 parts of a gasket, 405-04 parts of a bull gear, 405-05.6 parts of a bearing, 405-06 parts of a pinion locking nut, 405-07.5 parts of a gasket, 405-08 parts of a pinion, 405-09.7 parts of a bearing, 406 parts of a top plate, 407 parts of a top plate guide sleeve, 408 parts of a top plate guide column, 409 parts of a speed reducing motor, 410. the electric cylinder 411 is a guide post fixing seat, 412 is a base, 413 is a support plate guide post, 414 is a support plate, 415 is a guide post anti-slip sleeve, 416 is a tool handle rotating disc and 5 is a ground flat iron.

Detailed Description

The invention is described in detail below with reference to the attached drawing figures:

the invention provides a full-automatic, multi-working-condition and multi-index comprehensive electric spindle reliability loading test device which simulates reliability tests of an electric spindle under different working conditions and different loads.

Referring to fig. 1, the full-automatic, multi-working-condition and multi-index comprehensive electric spindle reliability test device provided by the invention comprises an electric spindle mobile positioning system 1, a low-frequency low-speed electric spindle reliability loading test system 2, a high-frequency high-speed electric spindle reliability loading test system 3, an electric spindle broach mechanism reliability test system 4 and a ground iron 5.

The device comprises a ground iron 5, an electric spindle mobile positioning system 1, an electric spindle broach mechanism reliability test system 4, a high-frequency high-speed electric spindle reliability loading test system 3, a low-frequency low-speed electric spindle reliability loading test system 2 and a high-frequency high-speed electric spindle reliability loading test system 3, wherein the ground iron 5 is arranged at the bottommost end, the electric spindle mobile positioning system 1 is arranged on the front side and the rear side of the ground iron 5, the electric spindle broach mechanism reliability test system 4 is arranged on the leftmost side of the ground iron 5, and the low-frequency low-speed electric spindle reliability loading test system 2 is arranged on the right side of the high-frequency high-speed electric spindle reliability loading test system 3; the electric spindle moving and positioning system 1, the low-frequency low-speed electric spindle reliability loading test system 2, the high-frequency high-speed electric spindle reliability loading test system 3 and the electric spindle broach mechanism reliability test system 4 are all in contact with the upper surface of the ground iron 5 and are fixedly connected through bolts.

1. Floor iron

The horizontal iron 5 is a cuboid plate-type casting, T-shaped grooves which are parallel to each other and have the same structure are formed in the top end of the horizontal iron 5, weight reduction grooves are formed in the bottom end of the horizontal iron 5, and two cuboid grooves are formed in the middle of the top end of the horizontal iron 5 and are used for installing an axial electro-hydraulic servo loader 204-01 in a low-frequency low-speed electric spindle reliability loading test system 2 and a drag torque loading device 304 in a high-frequency high-speed electric spindle reliability loading test system 3.

2. Electric spindle moving and positioning system

Referring to fig. 2, the electric spindle mobile positioning system 1 of the invention comprises a No. 1 precision ball screw 101-A, a No. 2 precision ball screw 101-B, an electric spindle simulation tool shank matching device 102 and a mobile gantry 103; wherein: the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B have the same structure;

referring to fig. 2, the movable gantry 103 is a large-scale gantry structural member manufactured by a casting method, the movable gantry 103 includes a front side pillar, a rear side pillar and a middle beam, the top ends of the front side pillar and the rear side pillar are vertically connected with the two ends of the middle beam into a whole, the front side pillar and the rear side pillar have the same structure, the front side pillar and the rear side pillar are both composed of a main pillar, a left auxiliary pillar and a right auxiliary pillar, wherein the left auxiliary pillar and the right auxiliary pillar have the same structure, the left auxiliary pillar and the right auxiliary pillar are symmetrically arranged on the left side and the right side of the main pillar, and the top ends of the left auxiliary pillar and the right auxiliary pillar are connected with the left side wall and the right side wall of the lower end of the main pillar into a whole; the bottom ends of the front side pillar and the rear side pillar are respectively cast with 1 group of 3 connecting plates, wherein the connecting plates at the bottom ends of the left auxiliary pillar and the right auxiliary pillar have the same structure, each group of 3 connecting plates are rectangular plate structural members, each connecting plate is uniformly provided with 4 groups of 16 bolt holes, 1 group of bolt holes on each connecting plate, a No. 1 guide rail sliding block in the No. 1 precise ball screw 101-A and the No. 2 precise ball screw 101-B and a threaded hole in the No. 2 guide rail sliding block are aligned and concentric, bolts are inserted into the bolt holes in the 3 connecting plates at the bottom ends of the front side pillar and the rear side pillar of the movable gantry 103 to fix the movable gantry 103 on the No. 1 precise ball screw 101-A and the No. 2 precise ball screw 101-B; the center of the bottom end of a connecting plate of a main support column in a front side support column and a rear side support column of the movable gantry 103 is cast with a front side screw rod nut seat and a rear side screw rod nut seat, and a screw nut 1 and a screw nut 2 on a precision ball screw 101-A and a precision ball screw 101-B1 are assembled and fixed by screws so as to realize the transmission of driving force.

Referring to fig. 3, the electric spindle simulation tool shank matching device 102 comprises a No. 3 precision ball screw 102-A, a No. 4 precision ball screw 102-B, a tool striking cylinder 102-01, a vertical guide rail mounting plate 102-02, a spindle water jacket 102-03, a spindle clamp 102-04, an electric spindle 102-05 and a joint plate 102-06. Wherein: no. 3 precision ball screw 102-A and No. 4 precision ball screw 102-B are the same in structure.

The model of the unclamping cylinder 102-01 is STJ gas-liquid pressure cylinder series unclamping cylinder produced by Sunto technologies, Inc., a thick flat plate is arranged on the lower side of the unclamping cylinder 102-01, bolt holes are arranged at four corners of the thick flat plate, and bolts are inserted into the bolt holes of the thick flat plate on the lower side of the unclamping cylinder 102-01 to fix the unclamping cylinder 102-01 on the top end of the electric spindle 102-05. The main function of the unclamping cylinder 102-01 is to drive the internal mechanism of the electric spindle 102-05 to be matched with the blind rivet of the simulated tool shank, so that the electric spindle 102-05 is matched with the simulated tool shank.

The main shaft newspaper holder 102-04 is a square structural member, a through hole is arranged at the geometric center of the square structural member, 8 threaded holes with the same structure are uniformly arranged on the bottom end surface of the circumference of the through hole of the main shaft newspaper holder 102-04, vertical strip plates are arranged at the right ends of the front side and the rear side of the main shaft newspaper holder 102-04, 5 bolt holes with equal intervals are respectively arranged on the vertical strip plates at the two sides and are concentric with the threaded holes arranged below the left side surface of the vertical guide rail mounting plate 102-02, and bolts are inserted into the bolt holes arranged on the vertical strip plates at the front side and the rear side of the main shaft newspaper holder 102-04 to fix the main shaft newspaper holder 102-04 below the left side surface of the vertical guide rail mounting plate 102-02.

The spindle water jacket 102-03 is a hollow cylindrical shell structural member, a circular ring-shaped flange is arranged at the bottom end of the spindle water jacket, 8 bolt holes are uniformly formed in the circumference of the outer side of the circular ring-shaped flange and are concentric with threaded holes in the bottom end face of the circumference of the through hole of the spindle newspaper holder 102-04, 14 threaded holes are uniformly formed in the circumference of the inner side of the flange, and the 14 threaded holes are concentric with the bolt holes formed in the flange of the electric spindle 102-05. The main shaft water jacket 102-03 is inserted into a central through hole of the main shaft clamp 102-04, the upper surface of a flange plate at the bottom end of the main shaft water jacket 102-03 is in contact with the bottom end surface of the main shaft clamp 102-04, and a bolt is inserted into a bolt hole on the outer circumference of the flange plate at the bottom end of the main shaft water jacket 102-03 to fix the main shaft water jacket 102-03 on the main shaft clamp 102-04.

The electric main shaft 102-05 is a long shaft tested piece, a circular ring-shaped flange is arranged at the bottom end of the electric main shaft 102-05, 14 bolt holes with the same structure are arranged on the flange, the 14 bolt holes with the same structure are concentric with 14 threaded holes arranged on the inner circumference of the flange at the bottom end of the main shaft water jacket 102-03, the upper surface of the flange at the bottom end of the electric main shaft 102-05 is in contact with the lower surface of the flange at the bottom end of the main shaft water jacket 102-03, and bolts are inserted into the bolt holes in the flange at the bottom end of the electric main shaft 102-05 to fix the electric main shaft 102-05 on the main shaft water jacket 102-03. A taper hole is formed in the geometric center of the bottom end of the electric spindle 102-05, and a clamping jaw is arranged in the taper hole and used for being matched with and installing a simulation tool shank.

The vertical guide rail mounting plate 102-02 is composed of a lower end square plate, a middle long plate and a top end small plate, wherein a threaded hole is formed in the left end face of the lower end square plate and is concentric with bolt holes in vertical strip plates on the front side and the rear side of a main shaft newspaper clamp 102-04, two rows of 24 threaded holes are formed in the right end face of the middle long plate of the vertical guide rail mounting plate 102-02 and are concentric with bolt holes in a base of a No. 3 precision ball screw 102-A, a square through hole is formed in the middle of the top end small plate of the vertical guide rail mounting plate 102-02, and a motor of the No. 3 precision ball screw 102-A is installed in the square through hole of the top end small plate of the vertical guide rail mounting plate 102-02 and is installed at the top end of the vertical guide rail mounting plate 102-02.

The No. 3 precision ball screw 102-A and the No. 4 precision ball screw 102-B are completely the same in structure.

Referring to fig. 4, the No. 4 precision ball screw 102-B comprises a No. 4 motor 102-B-01, a No. 4 screw mounting seat 102-B-02, 4 guide rail sliders 102-B-03 with the same structure, a No. 4 screw nut 102-B-04, a No. 4 screw 102-B-05, 2 guide rails 102-B-06 with the same structure, a No. 4 base 102-B-07, a No. 4 grating ruler 102-B-08, a No. 4 grating ruler reading head 102-B-09, a No. 4 reading head connecting plate 102-B-10 and a No. 4 bearing seat 102-B-11;

the No. 4 base 102-B-07 is a cuboid structural member, a groove is longitudinally arranged in the middle of the cuboid structural member, 8 bolt holes with equal distance are uniformly arranged at the intersection of groove walls on the front side and the rear side of the groove and the plane of the groove bottom of the groove, 4 threaded holes are arranged on the groove bottom at the left end of the groove and used for fixedly mounting a No. 4 lead screw mounting seat 102-B-02, a rectangular groove is arranged on the groove bottom at the right end of the groove and used for mounting a No. 4 bearing seat 102-B-11, and 9 threaded holes are respectively and uniformly arranged at the top ends of the front groove wall and the rear groove wall of the No. 4 base 102-B-07 along the longitudinal direction and used for fixing a No. 4 guide rail 102-B-06; the bottom plane of the No. 4 base 102-B-07 is in contact with the left end face of the middle cross beam of the movable gantry 103, bolts are inserted into bolt holes at the intersection of the front side wall and the rear side wall of the groove of the No. 4 base 102-B-07 and the groove bottom plane of the groove, and the No. 4 base 102-B-07, namely the No. 4 precision ball screw 102-B is fixedly installed on the left end face of the middle cross beam in the movable gantry 103.

The No. 4 motor 102-B-01 is located at the leftmost end of the No. 4 precision ball screw 102-B, and the No. 4 motor 102-B-01 is a loose NAS A4 series MDMA152P1V large inertia motor and is the total power source output of the No. 4 precision ball screw 102-B. The four corners of the rectangular plate at the right end of the No. 4 motor 102-B-01 are provided with 4 bolt holes which are aligned and concentric with the 4 threaded holes arranged on the left end surface of the No. 4 lead screw mounting seat 102-B-02, and the bolts are inserted into the 4 bolt holes arranged at the four corners of the rectangular plate at the right end of the No. 4 motor 102-B-01 to fix the No. 4 motor 102-B-01 on the left end surface of the No. 4 lead screw mounting seat 102-B-02.

The No. 4 lead screw mounting seat 102-B-02 is a cast shell structure, a rectangular through hole with a rounded corner is formed in the left end of the top end of the No. 4 lead screw mounting seat 102-B-02, a weight reduction groove is formed in the right side of the top end of the No. 4 lead screw mounting seat, and a bolt hole is formed in the bottom of the weight reduction groove and is concentric with a threaded hole in the No. 4 base 102-B-07; no. 4 lead screw mount 102-B-02 is provided with a cylindrical through hole in the center from the left end face to the right end face, and is concentric with a coupler and a bearing which are arranged inside the No. 4 lead screw mount 102-B-02, and the No. 4 lead screw mount 102-B-02 is provided with 4 threaded holes in the left end face and is concentric with a bolt hole in the right end face of the No. 4 motor 102-B-01. Bolts are inserted into the No. 4 lead screw mounting seat 102-B-02, the No. 4 lead screw mounting seat 102-B-02 is fixed on the groove bottom surface of the No. 4 base 102-B-07 groove in bolt holes arranged on the groove bottom surface of the weight-reducing groove. The No. 4 lead screw mounting seat 102-B-02 mainly has the functions of supporting the No. 4 lead screw 102-B-05 and connecting an output shaft of the No. 4 motor 102-B-01 with the No. 4 lead screw 102-B-05 to realize power transmission.

The No. 4 guide rail 102-B-06 with the same 2 structures adopts an HGW series linear guide rail, the No. 4 guide rail 102-B-06 is provided with 9 screw holes which are concentric with 9 screw holes respectively arranged at the front side and the rear side of the top end of the No. 4 base 102-B-07, the No. 4 guide rail 102-B-06 with the same 2 structures is fixedly connected on the No. 4 base 102-B-07 by screws and is longitudinally and symmetrically distributed relative to the No. 4 base 102-B-07, 4 No. 4 guide rail sliders 102-B-03 with the model number HGH25CA are mounted on 2 No. 4 guide rails 102-B-06 with the same structure and are symmetrically distributed about a No. 4 base 102-B-07, and 2 threaded holes are formed in the left side and the right side of each No. 4 guide rail slider 102-B-03.

The No. 4 lead screw 102-B-05 is an SFU04010-4 lead screw, the No. 4 lead screw 102-B-05 is positioned in the longitudinal middle of the No. 4 base 102-B-07 and is sleeved with a No. 4 lead screw nut 102-B-04, and the left and the right of the No. 4 lead screw 102-B-05 are supported and fixed by a No. 4 lead screw mounting seat 102-B-02 and a No. 4 bearing seat 102-B-11 respectively. The front side wall of the No. 4 base 102-B-07 is provided with a No. 4 precise grating ruler 102-B-08, the No. 4 grating ruler 102-B-08 adopts a grating ruler with the model number of KA-300 under SINO signal and flag, it has the advantages of high detection precision, high response speed and the like, the No. 4 grating ruler 102-B-08 is a rectangular structural member, a T-shaped groove is formed in the top end of the No. 4 precise grating ruler 102-B-08 and used for installing the No. 4 grating ruler reading head 102-B-09, 2 grooves sharing the same groove bottom in structure are formed in the front side and the rear side of the left end and the right end of the No. 4 grating ruler 102-B-08, through holes are formed in the groove bottoms of the 2 grooves in the horizontal direction, and screws are inserted into the through holes to fix the No. 4 grating ruler 102-B-08 on the front side wall of the No. 4 base 102-B-07.

The No. 4 grating ruler reading head 102-B-09 is a cuboid structure, a T-shaped claw is arranged at the lower end of the cuboid structure, 4 threaded holes are symmetrically formed in the left end and the right end of the front side of the No. 4 grating ruler reading head 102-B-09, 2 No. 4 reading head connecting plates 102-B-10 with the same structure are arranged on the outer side of the No. 4 grating ruler reading head 102-B-09 and are L-shaped folded plates, 2 screw holes are formed in the lower folded plate of the No. 4 reading head connecting plate 102-B-10 and are concentric with the threaded holes in the left end and the right end of the front side of the No. 4 grating ruler reading head 102-B-09, and screw holes are also formed in the upper folded plate and are concentric with the threaded holes in the joint plate 102-06.

The No. 4 grating ruler reading head 102-B-09 is matched with a T-shaped groove in the top of the No. 4 precise grating ruler 102-B-08 through a T-shaped claw of the No. 4 grating ruler reading head 102-B-09, so that the No. 4 grating ruler reading head 102-B-09 slides in the left and right directions of the No. 4 precise grating ruler 102-B-08. Screws are inserted into through holes in the lower side folded plate of the No. 4 reading head connecting plate 102-B-10 to fix the No. 4 reading head connecting plate 102-B-10 on the front side of the No. 4 grating scale reading head 102-B-09, and similarly, the screws are inserted into through holes in the upper side folded plate of the No. 4 reading head connecting plate 102-B-10 to connect and fix the No. 4 reading head connecting plate 102-B-10 and the joint plate 102-06.

Referring to fig. 3, the joint plate 102-06 is a cast flat plate structure, which is composed of a front nut seat, a rear nut seat and a middle flat plate, wherein 4 groups of 16 bolt holes are symmetrically arranged on the left side and the right side of the middle flat plate respectively, and the bolt holes are concentric with the threaded holes on the guide rail sliding blocks of the No. 4 precision ball screw 102-B and the No. 3 precision ball screw 102-A respectively. The joint plate 102-06 is provided with 2 groups of 4 threaded holes above the right side surface and at the rear side of the left side surface of the middle flat plate, and the two groups of threaded holes are concentric with the threaded holes on the reading head connecting plates of the No. 4 precision ball screw 102-B and the No. 3 precision ball screw 102-A respectively. Two screw nut seats arranged on the front side and the rear side of the joint plate 102-06 are respectively matched with the round surfaces of the screw nuts on the No. 4 precision ball screw 102-B and the No. 3 precision ball screw 102-A and are connected, locked and fixed through screws, and therefore power transmission is achieved. Bolts are inserted into the bolt holes on the joint plates 102-06 to tightly fix the joint plates 102-06 between the precision ball screw No. 3 102-a and the precision ball screw No. 4 102-B and to achieve tight interconnection between the precision ball screw No. 3 102-a, the joint plates 102-06, and the precision ball screw No. 4 102-B.

When the No. 4 motor 102-B-01 of the No. 4 precision ball screw 102-B is driven, the No. 4 lead screw 102-B-05 drives the No. 4 lead screw nut 102-B-04 to move left and right, the No. 4 lead screw nut 102-B-04 drives the joint plate 102-06 to move left and right, the joint plate 102-06 drives the No. 3 precision ball screw 102-A to move left and right, the No. 3 precision ball screw 102-A drives the vertical guide rail mounting plate 102-02 to move left and right, the vertical guide rail mounting plate 102-02 drives the electric main shaft 102-05 to move left and right, and the electric main shaft 102-05 is matched with the No. 4 grating ruler 102-B-08 and the background computer control system after power transmission layer by layer, the precise movement control of the motorized spindle 102-05 in the left-right direction can be realized by precisely controlling the No. 4 precise ball screw 102-B. Similarly, by controlling the No. 3 precision ball screw 102-A, the precise movement control of the electric spindle 102-05 in the up-and-down direction can be realized.

Referring to fig. 2 and 3, the difference between the structures of the No. 1 precision ball screw 101-a, the No. 2 precision ball screw 101-B, the No. 3 precision ball screw 102-a, and the No. 4 precision ball screw 102-B is that the guide rails and the bases of the No. 1 precision ball screw 101-a and the No. 2 precision ball screw 101-B are longer than those of the No. 3 precision ball screw 102-a and the No. 4 precision ball screw 102-B, and the guide rail sliders on the No. 1 precision ball screw 101-a and the No. 2 precision ball screw 101-B are installed with 12, while the guide rail sliders on the No. 3 precision ball screw 102-a and the No. 4 precision ball screw 102-B are installed with 4.3 grating rulers with certain intervals are distributed on the outer sides of the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B, and the positions of the grating rulers are respectively aligned with the positions of simulation tool shanks in the low-frequency low-speed electric spindle reliability loading test system 2, the high-frequency high-speed electric spindle reliability loading test system 3 and the electric spindle broach mechanism reliability test system 4; the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B are symmetrically arranged at the bottom ends of a front side pillar and a rear side pillar in the movable gantry 103 in parallel, and the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B are symmetrically arranged on the upper surface of the ground flat iron 5 along the longitudinal direction and are fixedly connected on the ground flat iron 5 by adopting a T-shaped bolt.

When the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B are driven, the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B transmit power to main pillars of front and rear pillars of the movable gantry 103 through layer-by-layer power transmission, so that the whole movable gantry 103 is driven to move left and right, and the movement of the electric spindle movement positioning system 1 in the left and right directions is realized, therefore, when the electric spindle movement positioning system 1 drives the electric spindle 102-05 to move and the low-frequency low-speed electric spindle reliability loading test system 2, the high-frequency high-speed electric spindle reliability loading test system 3 and a simulation tool shank in the electric spindle broach mechanism reliability test system 4 are matched, the grating ruler reader can accurately record the movement distance of the electric spindle 102-05 driven by the movable gantry 103 in the left and right directions, the precise movement control of the motorized spindle 102-05 in the left-right direction can be realized under the control of the No. 1 precise ball screw 101-A and the No. 2 precise ball screw 102-B by a background computer control system. The control function of the No. 3 precision ball screw 102-A and the No. 4 precision ball screw 102-B is combined, so that the precise movement control of the electric spindle 102-05 in the full freedom degree of the front, back, left, right, front and back can be realized under the driving of the electric spindle movement positioning system 1.

In summary, the ground iron 5 is installed at the bottommost part, the No. 1 precision ball screw 101-a and the No. 2 precision ball screw 101-B in the electric spindle moving and positioning system 1 are symmetrically installed on the front and back upper surfaces of the ground iron 5 and are fixedly connected through bolts, the movable gantry 103 spans across the ground iron 5 and is installed on the upper surfaces of the No. 1 precision ball screw 101-a and the No. 2 precision ball screw 101-B through bolts, and the electric spindle simulation tool shank matching device 102 is installed on the middle left side plane of the middle cross beam of the movable gantry 103 and is fixedly connected on the middle cross beam of the movable gantry 102 through bolts.

When the reliability loading test of the electric spindle is carried out, the electric spindle 102-05 can realize accurate movement in the left-right direction under the driving of a No. 1 precision ball screw 101-A and a No. 2 precision ball screw 102-B, can realize accurate movement in the up-down direction under the driving of a No. 3 precision ball screw 102-A, and can realize accurate movement in the front-back direction under the driving of a No. 4 precision ball screw 102-B, so that the electric spindle 102-05 can be driven to realize full-freedom movement and positioning by the whole electric spindle movement positioning system 1, the whole process of the adjustment of the electric spindle 102-05 is automatically completed by a computer control system, and the accurate matching with the simulated tool shanks in the low-frequency low-speed electric spindle reliability loading test system 2, the high-frequency high-speed electric spindle reliability loading test system 3 and the electric spindle broach mechanism reliability test system 4 can be realized, the method greatly improves the test precision and test efficiency of the reliability test of the electric spindle, and solves the problem that great time and labor are consumed in the test preparation process of manually adjusting the test bed, such as centering, tool changing and the like.

3. Low-frequency low-speed electric main shaft reliability loading test system

Referring to fig. 5, the low-frequency low-speed electric spindle reliability loading test system 2 includes a low-frequency low-speed radial force loading device 201, a low-frequency low-speed loading unit 202, a low-frequency low-speed torque loading device 203, and a low-frequency low-speed axial force loading device 204. The low-frequency low-speed radial force loading device 201, the low-frequency low-speed torque loading device 203 and the low-frequency low-speed axial force loading device 204 are fixedly connected with the ground iron 5 through bolts.

Referring to fig. 6, the low-frequency low-speed radial force loading device 201 of the low-frequency low-speed electric spindle reliability loading test system 2 comprises a radial electro-hydraulic servo loader 201-01, a middle force plate 201-02, 2 supports 201-03 with the same structure, a support plate 201-04, a low-frequency low-speed radial force loading ball socket 201-05 and a low-frequency low-speed radial force loading ball head 201-06.

The support plate 201-04 consists of a rectangular flat plate and 2 rectangular convex plates with the same structure, namely an installation seat, wherein the left end and the right end of the 2 rectangular convex plates with the same structure, namely the installation seat, are symmetrically and fixedly installed on the rectangular flat plate, open T-shaped grooves are formed in the front end and the rear end of each convex plate, bolts are installed in the T-shaped grooves, and the installation seat is used for fixedly connecting the installation support 201-03; the front, the rear, the left and the right rectangular flat plates of 2 mounting seats with the same structure are uniformly and symmetrically provided with 6 strip-shaped through holes, and bolts are inserted into the strip-shaped through holes of the rectangular flat plates to tightly fix the support plates 201-04 on the ground flat iron 5;

the 2 supports 201-03 with the same structure are positioned between the support plate 201-04 and the middle force plate 201-02, and the supports 201-03 comprise rectangular bottom flat plates, front and rear reinforcing rib plates, rectangular front and rear vertical flat plates, rectangular middle flat plates and upper circular plates.

The rectangular bottom plate in the support 201-03 is provided with fillets at four corners, rectangular weight-reducing through holes with fillets at four corners are arranged on the left side and the right side in the middle of the bottom plate of the support 201-03, bolt through holes are arranged at the front and the rear four corners of the bottom plate of the support 201-03, rectangular vertical plates with the same structure are arranged on the front and the rear sides of the top end face of the bottom plate of the support 201-03, rectangular middle plates which are perpendicular to the 2 front and rear vertical plates are arranged between the 2 rectangular front and rear vertical plates to be connected with the front and rear vertical plates and are vertically connected with the bottom plate into a whole, the 2 rectangular front and rear vertical plates are also connected with the bottom plate through front and rear 2 reinforcing rib plates, elongated weight-reducing holes are arranged on the left side and the right side of the 2 rectangular front and rear vertical plates, and a circular plate is arranged above the 2 rectangular front and rear vertical plates, the circular plate is provided with 4 threaded holes and is concentric with the through holes on the middle force plate 201-02. Bolts are inserted into bolt holes at the front and rear corners of a flat plate at the bottom of the support 201-03 and are matched and connected with bolt mounting seats in T-shaped grooves of convex plates above the support plate 201-04, so that the support 201-03 is tightly fixed at the top end of the support plate 201-04.

The middle force plate 201-02 is a rectangular flat plate with four corners being chamfered with round corners, and the left side and the right side of the middle force plate, which are contacted with the bracket 201-03, are provided with through holes and are concentric with threaded holes of a top circular plate of the bracket 201-03. The bottom end surface of the middle force plate 201-02 is contacted with a circular flat plate at the top of 2 brackets 201-03 with the same structure.

The radial electro-hydraulic servo loader 201-01 comprises a servo loading cylinder, a telescopic shaft, a protective cover, a transition push plate and a force sensor, wherein the protective cover of the radial electro-hydraulic servo loader 201-01 is a cuboid shell part without a top wall and a right side wall, the bottom wall of the protective cover is in contact with a middle force plate 201-02, a bolt through hole is formed in the bottom wall of the protective cover and is concentric with the through hole of the middle force plate 201-02, the servo loading cylinder of the radial electro-hydraulic servo loader 201-01 is positioned in the protective cover, the servo loading cylinder has the advantages of good control performance, accurate loader and the like, the telescopic shaft of the radial electro-hydraulic servo loader 201-01 is positioned on the right side of the servo loading cylinder of the radial electro-hydraulic servo loader 201-01, a threaded hole is formed in the right end of the telescopic shaft, and the telescopic shaft is controlled by the servo loading cylinder to extend back and forth; the transition push plate is positioned on the right side of the telescopic shaft of the radial electrohydraulic servo loader 201-01, the transition push plate consists of a left rectangular push plate, a right rectangular push plate and a connecting column, a bolt hole is arranged in the middle of the right surface of the left push plate which is contacted with the telescopic shaft, a bolt is inserted into the bolt hole arranged in the middle of the right surface of the left push plate to fix the left push plate of the transition push plate on the right surface of the telescopic shaft, threaded holes are respectively arranged on the front side and the rear side of the right surface of the left push plate and the front side and the rear side of the left surface of the right push plate of the transition push plate, the middle connecting column of the transition push plate consists of a middle optical axis and left and right short threaded rods, the left and right short threaded rods of the middle connecting column of the transition push plate are respectively matched and connected with the threaded holes arranged on the front side and the rear side of the left push plate of the transition push plate, the left push plate of the transition push plate is tightly connected with the left push plate of the transition push plate, a screw hole is arranged in the middle position of the left surface of the right push plate of the transition push plate and is concentric with the threaded hole of the geometric center of the force sensor which is adjacent to the transition push plate, and the screw is inserted into a screw hole arranged in the middle of the left surface of the right push plate of the transition push plate to fix the force sensor on the right surface of the right push plate of the transition push plate. The force sensor of the radial electro-hydraulic servo loader 201-01 is in the shape of a short cylinder, threaded holes are formed in the centers of the left side surface and the right side surface of the force sensor, and the threaded holes on the right side surface are used for installing and connecting a low-frequency low-speed radial force loading ball socket 201-05; the radial electro-hydraulic servo loader 201-01 is installed on the upper surface of the middle force plate 201-02, bolts are inserted into bolt holes of a bottom flat plate of the radial electro-hydraulic servo loader 201-01 and penetrate through the bolt holes of the middle force plate 201-02 to be matched with threaded holes of a top circular plate of the support 201-03, and the radial electro-hydraulic servo loader 201-01, the middle force plate 201-02 and the support 201-03 are tightly connected together.

The low-frequency low-speed radial force loading ball socket 201-05 consists of a short screw and a small cube, the screw is screwed into a threaded hole formed in the center of the right side surface of a force sensor of the radial electro-hydraulic servo loader 201-01 to tightly fix the low-frequency low-speed radial force loading ball socket 201-05 on the radial electro-hydraulic servo loader 201-01, a spherical groove is formed in one side, contacting with the low-frequency low-speed radial force loading ball head 201-06, of the small cube on the right side of the low-frequency low-speed radial force loading ball socket 201-05, the low-frequency low-speed radial force loading ball head 201-06 also comprises a short screw and a semicircular ball head, the semicircular ball head of the low-frequency low-speed radial force loading ball head 201-06 and the spherical groove of the low-frequency low-speed radial force loading ball socket 201-05 are concentric and have the same radius, and the screw part is screwed into the threaded hole of the loading unit 202 and is connected and fixed.

When a low-frequency low-speed electric main shaft reliability loading test is carried out, the radial electro-hydraulic servo loader 201-01 drives the telescopic shaft and drives the low-frequency low-speed radial force loading ball socket 201-05 to slowly approach the low-frequency low-speed radial force loading ball socket 201-06, when a spherical groove of the low-frequency low-speed radial force loading ball socket 201-05 is contacted with a semicircular ball head of the low-frequency low-speed radial force loading ball socket 201-06, the low-frequency low-speed radial force loading ball socket 201-05 pushes the low-frequency low-speed radial force loading ball socket 201-06 and applies force, and the low-frequency low-speed radial force loading ball socket 201-06 transmits the force to the low-frequency low-speed loading unit 202, so that radial force simulation loading on the low-frequency low-speed loading unit 202 is realized. The force sensor on the radial electro-hydraulic servo loader 201-01 feeds the force back to the background control system, and the precise radial force loading on the low-frequency low-speed loading unit 202 can be realized through the control of the background control system.

Referring to fig. 7, the low-frequency low-speed loading unit 202 of the low-frequency low-speed motorized spindle reliability loading test system comprises a bearing upper end cover 202-01, a bearing sleeve 1 202-02, a bearing lower end cover 202-03, a bearing 1 202-04, a gasket 1 202-05, a locknut 1 202-06, a sleeve 1 202-07, a low-frequency low-speed simulation tool shank 202-08, 2 bearings 2-09 with the same structure, a bearing retainer ring 202-10, a gasket 2-11, a locknut 2 202-12, a shaft sleeve 202-13, a bevel gear 1 202-14, a bevel gear 2 202-15 and a bearing 3 202-16.

Wherein: no. 1 bearing 202-04, No. 1 gasket 202-05, No. 1 lock nut 202-06, No. 2 bearing 202-09, bearing retainer ring 202-10, No. 2 gasket 202-11, No. 2 lock nut 202-12 and No. 3 bearing 202-16 are all standard parts.

The low-frequency low-speed simulation tool handle 202-08 is a BT40 series numerical control tool handle which is not manufactured in a standard mode and consists of a stepped shaft at the lower end, a middle conical surface tool handle head and a top blind rivet, wherein a threaded hole is formed in the top end of the middle conical surface tool handle head of the low-frequency low-speed simulation tool handle 202-08, and the blind rivet is fixed to the top end of the middle conical surface tool handle head through threaded connection with the top blind rivet. The low-frequency low-speed simulation tool handle 202-08 is installed inside the low-frequency low-speed loading unit 202 and is locked and fixed by other structural parts of the low-frequency low-speed loading unit 202. When the electric spindle 102-05 is matched with the low-frequency low-speed simulation tool handle 202-08, under the action of the unclamping cylinder 102-01, a claw in a conical hole of the electric spindle 102-05 is opened to tightly grasp a top rivet of the low-frequency low-speed simulation tool handle 202-08, and the conical hole at the lower end of the electric spindle 102-05 is matched with a middle conical surface tool handle head of the low-frequency low-speed simulation tool handle 202-08, so that the electric spindle 102-05 is matched with the low-frequency low-speed simulation tool handle 202-08.

The No. 1 bearing sleeve 202-02 is a hollow square structural part, threaded holes matched with the lever pull nails 204-06 are formed in the left side wall and the right side wall of the bearing sleeve 202-02, threaded holes matched with the low-frequency low-speed radial force loading ball heads 201-06 are formed in the rear side wall of the bearing sleeve 202-02, 4 threaded holes are formed in four corners of the upper end face and the lower end face of the bearing sleeve and are concentrically aligned with bolt holes in the upper end cover 202-01 of the bearing and bolt holes in the lower end cover 202-03 of the bearing respectively. 2 No. 2 bearings 202-09 with the same structure and a bearing retainer 202-10 are arranged in the No. 1 bearing sleeve 202-02, the 2 No. 2 bearings 202-09 with the same structure are positioned at the upper end and the lower end of the No. 1 bearing sleeve 202-02 and are separated by the bearing retainer 202-10, the upper No. 2 bearing 202-09 is positioned by a shaft shoulder of the low-frequency low-speed simulation tool shank 202-08, and the lower bearing is positioned and locked by a gasket 202-11 and a locking nut 202-12.

The bearing upper end cover 202-01 and the bearing lower end cover 202-03 are of the same structure and are both square flat plates, chamfers and screw holes are arranged at four corners of each square flat plate, the screw holes arranged at the four corners of the bearing upper end cover 202-01 and the bearing lower end cover 202-03 are respectively aligned and concentric with the screw holes arranged at the four corners of the upper end surface and the lower end surface of the bearing sleeve 202-02, and screws are inserted into the screw holes arranged at the four corners of the bearing upper end cover 202-01 and the bearing lower end cover 202-03 to fix the bearing upper end cover 202-01 and the bearing lower end cover 202-03 on the bearing sleeve 202-02 No. 1.

The lower end of the low-frequency low-speed loading unit 202 is mainly structurally a gear transmission pair consisting of a No. 1 conical gear 202-14 and a No. 2 conical gear 202-15, and the gear transmission pair is mainly used for transmitting torque from a dynamometer 203-01 so as to simulate the simulated torque loading of the low-frequency low-speed simulation tool handle 202-08 under a real working condition. The No. 1 bearing 202-04 is positioned below a bearing lower end cover 202-03 and is in contact with a shaft shoulder of the low-frequency low-speed simulation tool handle 202-08, the bearing is isolated from the No. 1 conical gear 202-14 through a shaft sleeve 202-13, and the No. 1 conical gear 202-14 is positioned and locked through a No. 1 locking nut 202-06 below the bearing and is connected with the low-frequency low-speed simulation tool handle 202-08 through a key to transmit torque. Similarly, bearing No. 3 202-16 is positioned in contact with the shoulder of the drive shaft of dynamometer 203-01, separated from conical gear No. 2 202-15 by sleeve No. 1 202-07, and conical gear No. 2 202-15 transmits torque from the drive shaft of dynamometer 203-01 by keyed connection.

Referring to fig. 5 and 6, the low-frequency low-speed torque loading device 203 of the low-frequency low-speed motorized spindle reliability loading test system mainly comprises a dynamometer 203-01 and a dynamometer base 203-02.

The bottom of the dynamometer base 203-02 is a rectangular bottom plate, 6 strip-shaped through holes are formed in the two longitudinal sides of the bottom plate, a cuboid-shaped shell is installed on the upper surface of the bottom plate along the longitudinal middle of the bottom plate, 4 reinforcing rib plates are arranged on the two longitudinal sides of the shell and connected with the bottom plate, the bottom of the dynamometer base 203-02 is connected with the ground iron 5 through the bottom plate, and bolts are inserted into the strip-shaped through holes in the bottom plate of the dynamometer base 203-02 to firmly fix the dynamometer base 203-02 on the ground iron 5.

The dynamometer 203-01 adopts an electric dynamometer with the model number DJ4000-XN-DL22, and the dynamometer is provided with a bearing seat unit to realize self protection, so that the dynamometer has the advantages of high reliability, safety and the like. The dynamometer 203-01 is installed at the top end of the dynamometer base 203-02, the surface of the left end and the middle of the dynamometer base is a cuboid protective cover, the protective cover is a U-shaped shell, strip plates are arranged on two longitudinal sides of the protective cover of the U-shaped shell, the strip plates on the two sides are provided with 4 strip-shaped through holes, and bolts are inserted into the strip-shaped through holes to tightly fix the dynamometer 203-01 on the dynamometer base 203-02. The dynamometer engine is positioned on the right side of the dynamometer 203-01, and a precise torque sensor and a torque loading device are arranged in the dynamometer engine and can output precise torque under the control of a background control system. The transmission shaft of the dynamometer 203-01 is positioned at one side close to the low-frequency low-speed loading unit 202, and is connected with a No. 2 bevel gear 202-15 on the low-frequency low-speed loading unit 202 in a key manner to transmit torque.

When a low-frequency low-speed electric spindle reliability loading test is carried out, the dynamometer 203-01 is started to drive the transmission shaft to rotate, and the dynamometer 203-01 transmits accurate torque to the No. 2 bevel gear 202-15 through the transmission shaft under the control of a background control system so as to be applied to the low-frequency low-speed loading unit 202, so that accurate torque loading of the low-frequency low-speed loading unit 202 is realized.

Referring to fig. 6 and 8, the low-frequency low-speed axial force loading device 204 of the low-frequency low-speed motorized spindle reliability loading test system comprises an axial electro-hydraulic servo loader 204-01, a low-frequency low-speed axial force loading ball head 204-02, a low-frequency low-speed axial force loading ball socket 204-03, a lever support seat 204-04, a lever 204-05, a lever pull nail 204-06 and a loading fork 204-07.

The axial electro-hydraulic servo loader 204-01 is similar to the radial electro-hydraulic servo loader 201-01 in structure, and the only difference is that a force sensor of the axial electro-hydraulic servo loader 204-01 is arranged on the lower surface of an upper side push plate of a transition push plate of the radial electro-hydraulic servo loader 201-01 and is fixedly connected through a screw. The axial electro-hydraulic servo loader 204-01 is vertically arranged in a cuboid groove dug in the middle of the ground flat iron 5, the outer surface of the bottom of a protective cover of the axial electro-hydraulic servo loader 204-01 is in contact fit with the inner surface of the groove wall of the ground flat iron 5, and a bolt penetrates through a bolt hole of the protective cover of the axial electro-hydraulic servo loader 204-01 to tightly fix the axial electro-hydraulic servo loader 204-01 on the ground flat iron 5. The low-frequency low-speed axial force loading ball head 204-02 is fixed at the rightmost end of the lever 204-05 in a threaded connection mode and is concentric with a spherical groove of a low-frequency low-speed axial force loading ball socket 204-03 fixed at the top end of the axial electro-hydraulic servo loader 204-01.

Referring to fig. 8, the lever support 204-04 is located at the middle of the lever 204-05, and mainly functions to provide a fulcrum for supporting the lever. The lever supporting seat 204-04 comprises a supporting seat 204-04-01, 2 No. 4 bearings 204-04-02 with the same structure, a fixed end cover 204-04-03, a No. 3 gasket 204-04-04, a supporting shaft 204-04-05, a No. 3 locking nut 204-04-06 and 2 No. 2 sleeves 204-04-07 with the same structure. Wherein: no. 4 bearing 204-04-02 and No. 3 lock nut 204-04-06 are standard parts.

The supporting shaft 204-04-05 is a smooth cylindrical shaft, the lever 204-05 is a cuboid steel plate, threaded holes are respectively formed in the front side and the rear side of the leftmost end of the lever 204-05 and used for connecting a loading fork 204-07, threaded holes are formed in the upper surface of the rightmost end of the lever 204-05 and used for connecting a low-frequency low-speed axial force loading ball head 204-02, a circular through hole is formed in the middle of the lever 204-05 and sleeved in the middle of the supporting shaft 204-04-05, a No. 2 sleeve 204-04-07 and a No. 4 bearing 204-04-02 which are identical in structure are symmetrically distributed on two sides of the lever 204-05, the No. 4 bearing 204-04-02 on the left side is positioned and clamped through a groove shoulder on the supporting seat 204-04-01, and the bearing on the right side is positioned and locked through a No. 3 locking nut 204-04-06, the end face of the inner side of the fixed end cover 204-04-03 is in contact connection with the right end face of the support shaft 204-04-05 and is locked and fixed with the support seat 204-04-01 by a screw.

Referring to fig. 6, the loading fork 204-07 is installed at the leftmost end of the lever 204-05 and is structured as a U-shaped fork-like structural member, through holes are formed in the front fork arm and the rear fork arm, lever pull nails 204-06 are inserted into the through holes in front of and behind the loading fork 204-07 to fix the loading fork 204-07 on the bearing sleeve No. 1 202-02 of the loading unit 202, two small rectangular plates which are equal in distance to the lever 204-05 in thickness and are symmetrically distributed with respect to the lever 204-05 are arranged at the right end of the loading fork 204-07, 2 threaded holes are formed in each small rectangular plate, the lever 204-05 is inserted between the two small rectangular plates, and a screw penetrates through the through hole in the small rectangular plate to connect and fix the loading fork 204-07 and the lever 204-05.

When a low-frequency low-speed electric spindle reliability loading test is carried out, a radial electro-hydraulic servo loader 204-01 in a low-frequency low-speed axial force loading device 204 drives a low-frequency low-speed axial force loading ball socket 204-03 to move downwards, when a spherical groove of the low-frequency low-speed axial force loading ball socket 204-03 is contacted with a low-frequency low-speed axial force loading ball head 204-02, the low-frequency low-speed axial force loading ball head 204-02 is subjected to pressure from the low-frequency low-speed axial force loading ball socket 204-03 and transmits the pressure to a lever 204-05, the lever 204-05 exerts an upward force on a loading fork 204-07 through a lever support seat 204-04 by utilizing the lever principle, the loading fork 204-07 transmits the force to a lever pull nail 204-06, and the lever pull nail 204-06 transmits the force to a low-frequency low-speed loading unit 202, therefore, the axial force loading of the low-frequency low-speed loading unit 202 can be simulated, and the precise axial force simulation loading of the low-frequency low-speed loading unit 202 can be realized by precisely controlling the axial electro-hydraulic servo loader 204-01.

In summary, referring to fig. 5, the low-frequency low-speed radial force loading device 201 is installed on the front side, and drives the low-frequency low-speed radial force loading ball socket 201-05 to apply a radial force to the low-frequency low-speed loading unit 202 installed in the middle by driving the radial force electro-hydraulic servo loader 201-01; the low-frequency low-speed axial force loading device 204 is arranged on the rear side and applies axial force to the low-frequency low-speed loading unit 202 through a loading fork 204-07; the low-frequency low-speed torque loading device 203 is arranged on the right side of the low-frequency low-speed loading unit 202 and applies torque to the low-frequency low-speed loading unit 202 through a bevel gear connection.

When a low-frequency low-speed electric spindle reliability loading test is carried out, the low-frequency low-speed radial force loading device 201 utilizes a radial electro-hydraulic servo loader 201-01 to drive a low-frequency low-speed radial force loading ball socket 201-05 to act on a low-frequency low-speed radial force loading ball head 201-06 to realize radial force loading on a low-frequency low-speed loading unit 202, a low-frequency low-speed torque loading device 203 realizes torque loading on the low-frequency low-speed loading unit 202 through torque transmission of a dynamometer 203-01 and gear transmission, a low-frequency low-speed axial force loading device 204 utilizes an axial electro-hydraulic servo loader 204-01 to drive a low-frequency low-speed axial force loading ball socket 204-03 to act on a low-frequency low-speed axial force loading ball head 204-02 on a lever 204-05, and the lever 204-05 utilizes a lever action principle to transmit force to the low-frequency low-speed loading unit 202 so as to realize radial force loading on the low-frequency low-speed loading unit 202, the comprehensive simulation loading of the low-frequency low-speed loading unit 202 can be realized under the comprehensive action of the low-frequency low-speed radial force loading device 201, the low-frequency low-speed torque loading device 203 and the low-frequency low-speed axial force loading device 204, so that the comprehensive simulation loading of the electric spindle 102-05 under various working conditions is simulated, and the loading frequency, the electric spindle rotating speed and the torque loading speed of the experimental device are lower than those of the high-frequency high-speed electric spindle reliability loading test system 3, so that the experimental device is also called a low-frequency low-speed electric spindle reliability loading test system.

4. High-frequency high-speed electric main shaft reliability loading test system

Referring to fig. 9, the high-frequency high-speed electric spindle reliability loading test system 3 includes a high-frequency high-speed radial mean force loading device 301, a high-frequency high-speed loading unit 302, a high-frequency high-speed radial amplitude force loading device 303, a drag torque loading device 304, and a high-frequency high-speed axial force loading device 305. The high-frequency high-speed radial mean force loading device 301, the high-frequency high-speed radial amplitude force loading device 303 and the drag torque loading device 304 are fixedly connected with the ground iron 5 through bolts.

Referring to fig. 10, the high-frequency high-speed radial mean force loading device 301 of the high-frequency high-speed electric spindle reliability loading test system 3 comprises a mean electric cylinder 301-01, a mean electric cylinder support base 301-02, an electric cylinder connecting sleeve 301-03, a force transducer 301-04, a loading steel wire rope 301-05, a No. 1 pull nail 301-06 and a No. 2 pull nail 301-07; wherein: the No. 1 pull stud 301-06 has exactly the same structure as the No. 2 pull stud 301-07.

The mean value electric cylinder supporting seat 301-02 is an L-shaped plate type structural member and comprises a supporting wall, a base, a supporting flat plate and a reinforcing rib plate; the support wall, the base and the support flat plate are all rectangular plate type structural members, threaded holes for mounting the mean value electric cylinder 301-01 are uniformly distributed at the upper end of the support wall, 1 through hole for mounting a telescopic shaft of the mean value electric cylinder 301-01 is formed in the center of each threaded hole, the telescopic shaft of the mean value electric cylinder 301-01 is concentrically aligned with the through hole, 2 strip-shaped through holes are formed in the base, the support wall and the base are equal in width, the bottom end of the support wall and the right end of the base are vertically connected into a whole, the support flat plate is located in the middle of the support wall and parallel to the base, the right end of the support flat plate is fixedly connected with the left side wall surface of the support wall, a right-angled triangular reinforcing rib plate is located below the support flat plate, and 2 right-angled sides of the reinforcing rib plate and; bolts are inserted into the 2 strip-shaped through holes to fix the mean value electric cylinder supporting seat 301-02 on the ground flat iron 5;

the mean value electric cylinder 301-01 adopts a CL065 series servo electric cylinder and has the advantages of high precision, large thrust, stable operation, durability and the like, and the mean value electric cylinder 301-01 comprises an upper transmission device part and a lower servo motor device; a bolt hole is arranged at the right end of the transmission device above the mean value electric cylinder 301-01 and concentrically aligned with a threaded hole arranged at the upper end of the supporting wall of the supporting seat 301-02, and a servo motor at the lower side of the bolt hole is in contact with the upper surface of a supporting flat plate on the supporting seat 301-02; the mean value electric cylinder 301-01 is fixed on the left side wall surface of the right side supporting wall of the mean value electric cylinder supporting seat 301-02 by inserting bolts into bolt holes arranged at the right end of the transmission device above the mean value electric cylinder 301-01.

The left end of the electric cylinder connecting sleeve 301-03 is a cylinder with a rhombic cross section, a threaded hole is formed in the center of the left end face and is concentric with a telescopic shaft of the transmission device above the mean value electric cylinder 301-01, a short screw rod is arranged at the right end of the electric cylinder connecting sleeve 301-03 and is concentric with a threaded hole in the left end face of the force measuring sensor 301-04, threads are arranged at the right end of the telescopic shaft of the transmission device above the mean value electric cylinder 301-01 and are inserted into a through hole in the upper end of a supporting wall in the mean value electric cylinder supporting seat 301-02 and then are matched and connected with the threaded hole in the left end of the electric cylinder connecting sleeve 301-03, and the short screw rod in the right end of the electric cylinder connecting sleeve 301-03 is matched and connected with the threaded hole in the left end of the force measuring sensor 301-04.

The force measuring sensor 301-04 adopts a CZ-CW11-5KN sensor, the force measuring sensor 301-04 is a small cuboid structural member, threaded holes are formed in the geometric centers of the left end surface and the right end surface of the small cuboid structural member, the right end of the No. 1 blind rivet 301-06 is a short screw, the left end of the short screw is a small cube, a through hole in the vertical direction is formed in the small cube, and the threaded hole in the right end of the force measuring sensor 301-04 is fixedly connected with the short screw at the left end of the No. 2 blind rivet 301-07 through threads; two ends of the loading steel wire rope 301-05 are respectively inserted into the central through holes of the No. 1 blind rivet and the No. 2 blind rivet, and are fixedly connected after extending out to form a steel wire rope closed ring.

When a high-frequency high-speed electric spindle reliability loading test is carried out, the mean value electric cylinder 301-01 drives the telescopic shaft to pull along the axial direction of the steel wire rope, the steel wire rope is tensioned and transmits force to the high-frequency high-speed loading unit 302, the force measuring sensor 301-04 feeds the loading force back to the background computer control system, and the computer accurately controls the force applied by the mean value electric cylinder 301-01, so that the accurate loading of the simulated mean value radial force of the high-frequency high-speed loading unit 302 is realized.

Referring to fig. 11, the high-frequency high-speed loading unit 302 of the high-frequency high-speed electric spindle reliability loading test system 3 of the present invention is completely the same as the structure of the conical gear No. 1 202-14 of the low-frequency low-speed loading unit 202 of the low-frequency low-speed electric spindle reliability loading test system 2, and is slightly different in that a groove is additionally provided on the front and rear sides of the bearing housing No. 2-01 of the high-frequency high-speed loading unit 302, and threaded holes are provided on the upper and lower sides of the groove, and the main purpose of the present invention is to match and connect with the axial force-bearing lug 305-03 of the high-frequency high-speed loading unit 302 of the high-frequency high-speed electric spindle reliability loading test system 3.

Referring to fig. 12, the radial amplitude force loading device 303 comprises a radial amplitude force loading ball socket 303-01, a loading rod 303-02, a nut 303-03, an amplitude vibration table 303-04 and an amplitude sensor 303-05; wherein: the nut 303-03 is a standard part.

The amplitude vibration table 303-04 is an electric vibration test system which is manufactured by Suzhou Dongzi vibration test instrument limited and has the model number of ES-2-150, the maximum load of the electric vibration test system can reach 70kg, and the loading frequency can reach 4000 Hz. The amplitude vibration table 303-04 comprises a base, a vibration device and a support column;

the base of the amplitude vibration table 303-04 is composed of a square bottom plate and a front side wall and a rear side wall which are the same, the square bottom plate of the base is vertically connected with the front side wall and the rear side wall into a whole, the lower surface of the square bottom plate of the base is in contact with the upper surface of the ground iron, a long strip-shaped through hole is formed in the right side of the square bottom plate, and a bolt is inserted into the long strip-shaped through hole to fix the base of the amplitude vibration table 303-04 on the upper surface of the ground iron 5. Chamfers are arranged above the side walls of the front side and the rear side of the base, concentric circular through holes with the same height are arranged on the front side and the rear side of the base, and 4 threaded holes are uniformly formed in the periphery of the through holes.

The vibration device of the amplitude vibration table 303-04 is a cylindrical shell structural member, a threaded hole is formed in the left end face of the vibration device and is concentrically aligned with the bolt hole of the amplitude sensor 303-05, a through hole with the same radius as that of a support column is formed in the middle of the front end and the rear end of the cylindrical shell, a transition conical surface is arranged at the right end of the cylindrical shell of the vibration device of the amplitude vibration table 303-04, and a circular vent hole with the upward direction is formed in the transition conical surface.

The middle of a support column of the amplitude vibration table 303-04 is a long-strip cylinder, disc fixing plates are arranged at the front end and the rear end of the cylinder, and 4 bolt holes are formed in the disc fixing plates and aligned and concentric with threaded holes in the front side wall and the rear side wall of the base; the middle long-strip cylinder of the support column of the amplitude vibration table 303-04 is inserted into the through holes on the front and rear side walls of the base of the amplitude vibration table 303-04 and the through holes on the front and rear sides of the vibration device of the amplitude vibration table 303-04, and the base of the amplitude vibration table 303-04, the vibration device and the support column are tightly connected and fixed into a whole through the disc fixing plate of the support column of the amplitude vibration table 303-04.

The amplitude sensor 303-05 adopts a spoke sensor transmitter with the model of LZ-JX1, and has the advantages of high sensitivity, quick dynamic response and the like. The amplitude sensor 303-05 is a disc-shaped structural member, bolt holes are uniformly formed in the amplitude sensor 303-05 along the circumferential direction, and bolts are inserted into the bolt holes to fix the amplitude sensor 303-05 at the center of the left end of the amplitude vibration table 303-04.

The loading rod 303-02 is a step-type long shaft, a fillet is arranged at the transition position, a threaded hole is formed in the center of the left end face of the loading rod, a short screw rod with an external thread is arranged at the rightmost end of the loading rod, and the short screw rod is inserted into a center hole of the nut 303-03 and is matched and fixedly connected with the threaded hole in the left end of the amplitude sensor 303-05.

The radial amplitude force loading ball socket 303-01 and the low-frequency low-speed radial force loading ball socket 201-06 are completely the same in structure, and a short screw rod on the right side of the radial amplitude force loading ball socket 303-01 is assembled and fixedly connected with a threaded hole at the left end of the loading rod 303-02.

When a high-frequency high-speed electric spindle reliability loading test is carried out, the amplitude vibration table 303-04 is started, the loading rod 303-02 and the radial amplitude force loading ball socket 303-01 are driven by the amplitude vibration table 303-04 to apply amplitude force to the high-frequency high-speed loading unit stress ball head 303-06 on the high-frequency high-speed loading unit 302, and therefore radial amplitude force loading of the high-frequency high-speed loading unit 302 is achieved. Because the amplitude vibration table 303-04 can apply a dynamic amplitude loading force of kilohertz to the high-frequency high-speed loading unit 302, high-frequency loading of the high-frequency high-speed loading unit 302 can be achieved.

Referring to fig. 13, the counter-dragging torque loading device 304 comprises a counter-dragging electric spindle holding clamp 304-01, a counter-dragging torque loading electric spindle 304-02, a coupler 304-03 and a high-frequency high-speed simulation tool shank 304-04. Wherein: the coupling 304-03 is a standard component.

The counter-dragging electric spindle newspaper holder 304-01 is a cuboid structural member with a through hole in the middle, threaded holes are uniformly formed around the through hole on the top end face of the counter-dragging electric spindle newspaper holder, round corners are formed at the intersection of the left side wall face, the right side wall face and the front end face of the spindle newspaper holder 304-01, strip-shaped flat plates are arranged on the left side and the right side of the spindle newspaper holder 304-01, 4 bolt holes with equal spacing distances are formed in the strip-shaped flat plates, and bolts are inserted into the bolt holes to tightly fix the spindle newspaper holder 304-01 on the ground flat iron 5.

The counter-dragging torque loading electric spindle 304-02 and the electric spindle 102-05 have the same structure, a bolt hole in a flange plate of the counter-dragging torque loading electric spindle 304-02 is aligned and concentric with a threaded hole in the top end face of the counter-dragging electric spindle newspaper holder 304-01, and a bolt is inserted into a bolt hole in the flange plate of the counter-dragging torque loading electric spindle 304-02 to fix the counter-dragging torque loading electric spindle 304-02 on the counter-dragging electric spindle newspaper holder 304-01. The center of the top end face of the drag torque loading electric spindle 304-02 is provided with a taper hole for being matched with and installing the high-frequency high-speed simulation tool handle 304-04.

The structure of the high-frequency high-speed simulation tool handle 304-04 is completely the same as that of the low-frequency low-speed simulation tool handle 202-08, a rivet at the lower end of the high-frequency high-speed simulation tool handle 304-04 and a conical surface tool handle head are matched, connected and fixed with a claw in a conical hole at the top end face of the drag torque loading electric spindle 304-02, and the upper end of the high-frequency high-speed simulation tool handle 304-04 is locked by a coupler 304-03 and connected with the high-frequency high-speed loading unit 302 to transmit torque.

When a high-frequency high-speed electric spindle reliability loading test is carried out, the dragging torque loading electric spindle 304-02 is started to rotate, and the precise torque loading of the high-frequency high-speed loading unit 302 is realized through the control of rated output torque of the dragging torque loading electric spindle 304-02. In the test process, the laser displacement sensor can be used for measuring the axis motion track of the high-frequency high-speed simulation tool shank 304-04 and the like to show the centering performance of the dragging torque loading electric spindle 304-02, so that a data acquisition method is provided for the research of the influence of different radial forces on the centering performance of the dragging torque loading electric spindle 304-02.

Referring to fig. 14 to 16, the high-frequency high-speed axial force loading device 305 of the present invention includes 2 guide pillar support seats 305-01 having the same structure, an axial force sensor 305-02, 2 axial force receiving lug assemblies having the same structure, 2 loading forks 305-07 having the same structure, a push plate 305-08, a nut 305-09, a pull rod 305-10, a high-frequency high-speed axial force loading electric cylinder 305-11, 4 guide pillar fixing sleeves 305-12 having the same structure, a support plate 305-13, 2 push plate guide sleeves 305-14 having the same structure, 2 push plate guide pillars 305-15 having the same structure, 2 top wheels 305-16 having the same structure, and 2 steel pins 305-17 having the same structure; wherein: the 2 axial stress lug assemblies with the same structure comprise 2 axial stress lugs 305-03 with the same structure, 8 tensioning sleeves 305-04 with the same structure, 8 No. 4 locking nuts 305-04 with the same structure and 4 steel wire ropes 305-06 with the same structure; nuts 305-09 and No. 4 nuts 305-04 are standard pieces.

The upper part and the lower part of the guide column supporting seat 305-01 which is symmetrically distributed on two sides are of a hollow structure, the structure of the guide column supporting seat is similar to that of a 6-shaped support, 2 strip-shaped through holes are formed in a flat plate at the bottom end of the guide column supporting seat 305-01, bolts are inserted into the strip-shaped through holes to fix the guide column supporting seat 305-01 on a ground flat iron 5, semi-cylindrical grooves are formed in the upper end of the guide column supporting seat 305-01 and the front end of a supporting plate in the middle of the guide column supporting seat 305-01, and 4 threaded holes are formed in two sides of each groove.

The integral structure of the supporting plate 305-13 is similar to a diamond thick plate, through holes are formed in the left end, the right end and the middle of the supporting plate 305-13, threaded holes are uniformly formed around each through hole, 1 through hole is further formed in the right lower corner of the supporting plate 305-13, and round corners are formed in the four corners of the supporting plate 305-13; the top end of the push plate guide sleeve 305-14 is provided with a circular ring flange, bolt holes are uniformly formed in the flange, the lower end of the push plate guide sleeve 305-14 is a cylinder, the circular ring flange and the lower end are connected into a whole, the circular ring flange and the lower end are collinear with the rotation axis of the cylinder, the center of the push plate guide sleeve 305-14 is provided with a center through hole, and the radius of the center through hole is the same as that of the cross section of the push plate guide column 305-14; two push plate guide sleeves 305-14 with the same structure are arranged in through holes at the left end and the right end of the support plate 305-13, and the bottom end surface of a flange plate at the top end of each push plate guide sleeve 305-14 is in contact with the support plate 304-13 and is fixed on the support plate 304-13 by adopting bolt connection.

The push plate guide column 305-15 is a long cylindrical straight rod shaft, and the push plate guide column 305-15 is inserted into through holes arranged at the left end and the right end of the push plate guide sleeve 305-14 and the support plate 305-13 and is arranged in a semi-cylindrical groove of the support seat 305-01; the guide column fixing sleeve 305-12 is composed of a middle semicircular shell and short plates on the left side and the right side, bolt holes are formed in the short plates, the radius of an inner semicircular hole of the middle semicircular shell is equal to the radius of two ends of the push plate guide column 305-15, the inner surface of the semicircular shell of the guide column fixing sleeve 305-12 is in contact connection with the push plate guide column 305-14, and bolts are inserted into the bolt holes on the left side and the right side of the guide column fixing sleeve 305-12 to fix the push plate guide column 305-14 on the guide column supporting seat 305-01.

The high-frequency high-speed axial force loading electric cylinder 305-11 is vertically arranged below the right lower corner of the supporting plate 305-13, and the upper end of a telescopic shaft of the high-frequency high-speed axial force loading electric cylinder 305-11 is provided with threads; the pull rod 305-10 is a stepped shaft, a threaded hole is formed in the lower end, close to the high-frequency high-speed axial force loading electric cylinder 305-11, of the pull rod 305-10 and is matched, connected and fixed with a telescopic shaft of the high-frequency high-speed axial force loading electric cylinder 305-11, the upper end of a shaft shoulder of the pull rod 305-10 is of a short screw rod structure, the shaft shoulder of the pull rod 305-10 is in contact with the bottom end face of the supporting plate 305-13, and a screw rod at the upper end of the shaft shoulder is inserted into a through hole in the right lower corner of the supporting plate 305-13 and is locked and fixed through a locking nut 305-09.

The axial force sensor 305-02 positioned on the supporting plate 305-13 is a circular ring structural member, a through hole is formed in the middle of the circular ring structural member and is concentric with the through hole in the middle of the push plate 305-08, bolt holes are uniformly formed around the through hole in the middle of the axial force sensor 305-02, the bolt holes which are uniformly arranged are aligned and concentric with threaded holes in the periphery of the through hole in the middle of the supporting plate 305-13, and bolts are inserted into the through hole in the axial force sensor 305-02 to fix the axial force sensor 305-02 on the supporting plate 305-13.

The push plate 305-08 is a rhombic flat plate structural member, a middle through hole is formed in the middle of the push plate 305-08, 4 threaded holes are formed in the front end and the rear end of the push plate 305-08 in the longitudinal direction respectively and are aligned and concentric with the threaded holes in the flat plate at the bottom of the loading fork 305-07, bolt holes are uniformly formed in the periphery of the middle through hole of the push plate 305-08 and are aligned and concentric with the threaded holes in the periphery of the middle through hole of the axial force sensor 305-02, and bolts are inserted into the bolt holes in the periphery of the middle through hole of the push plate 305-08 to fix the push plate 305-.

The 2 loading forks 305-07 with the same structure are composed of a bottom flat plate, a middle supporting column and an upper end fork. The bottom flat plate at the bottom end of the loading fork 305-07 is a rectangular flat plate, 4 bolt holes are arranged at four corners of the bottom flat plate, the bolt holes in the rectangular flat plate are aligned and concentric with threaded holes at the front end and the rear end of the push plate 305-08, the upper end fork of the loading fork 305-07 is composed of two front fork walls and a rear fork wall and a bottom plate, the top ends of the two front fork walls and the rear fork walls are chamfered and provided with coaxial through holes, the bottom ends of the two front fork walls and the rear fork walls are vertically and symmetrically connected with the two ends of the bottom plate, the upper end fork is vertically connected with the top end face of the middle supporting column into a whole through the bottom end face of the bottom plate, and the bottom end of the middle supporting column is vertically connected with the center of the upper surface of the bottom flat plate into a whole; the loading fork 305-07 is mounted on the top of the push plate 30-08 and a bolt is inserted into a bolt hole in the bottom plate of the loading fork 305-07 to secure 2 identically constructed loading forks 305-07 at the front and rear top ends of the push plate 305-08.

The top wheel 305-16 is a round wheel with a central through hole and a circular arc-shaped groove arranged on the periphery, the through hole arranged in the middle of the round wheel is concentric with and has the same diameter as the through holes on the front fork wall and the rear fork wall of the upper fork of the loading fork 305-07, and the steel pin 305-17 is inserted into the through holes on the front fork wall and the rear fork wall of the loading fork 305-07 and the central through hole of the top wheel 305-16 to install the top wheel 305-16 in the middle of the front fork wall and the rear fork wall of the upper fork of the loading fork 307-07.

The 2 axial force bearing lugs 305-03 with the same structure are composed of an outer mounting sleeve and an inner fixing plate, and are symmetrically mounted at the top end of the loading fork 305-07; the front end and the rear end of the outer side mounting sleeve of the axial stress lug 305-03 are both rectangular flat plates, a through hole is formed in the middle of the rectangular flat plate at the rear side, round corners are formed at the intersection transition positions of the front side flat plate, the rear side flat plate and the left side wall and the right side wall, the left side wall and the right side wall of the mounting sleeve are 8-shaped side walls, and threaded holes are formed in the upper part and the lower part of the mounting sleeve; the inner side fixing plate of the axial force bearing lug 305-03 is a rectangular flat plate, bolt holes are formed in the upper end and the lower end of the inner side fixing plate, the bolt holes are aligned and concentric with threaded holes formed in the front end and the rear end of a bearing sleeve 302-01 of the high-frequency high-speed loading unit 302, a groove is formed in the middle of the front side of the fixing plate of the axial force bearing lug 305-03, and the width of the groove is the same as the upper width and the lower width of the flat plate on the front side of the mounting sleeve of the axial force bearing lug 305-03; the groove of the fixing plate of the axial stress lug 305-03 is clamped on the front rectangular flat plate of the mounting sleeve and is contacted with the inner side wall of the front rectangular flat plate of the mounting sleeve. A rectangular flat plate of an outer side mounting sleeve of 2 axial stress lugs 305-03 with the same structure, which is close to a high-frequency high-speed loading unit 302, is mounted in a front groove and a rear groove of a bearing sleeve 302-01 of the high-frequency high-speed loading unit 302, an inner side fixing plate of the 2 axial stress lugs 305-03 with the same structure is in fit contact with the front surface and the rear surface of the bearing sleeve 302-01 of the high-frequency high-speed loading unit 302, and bolts are inserted into bolt holes formed in the upper end and the lower end of the inner side fixing plate of the 2 axial stress lugs 305-03 with the same structure to tightly fix the 2 axial stress lugs 305-03 with the same structure on the high-frequency high-speed loading unit 302.

The tightening sleeve 305-04 is similar to a bolt, the left side is provided with a screw rod at the right side of the head, the tightening sleeve 305-04 is provided with a through hole at the center in the left-right direction, and the tightening sleeve 305-03 passes through the center hole of the nut and is matched, connected and fixed with the threaded holes in the left 8-shaped side wall and the right 8-shaped side wall of the axial stress lug 305-03;

the steel wire rope 305-06 penetrates through the tightening sleeve 305-04, the nut 305-05 at the left side and an upper and lower through hole of the 8-shaped side wall of the mounting sleeve at the outer side of the axial stress lug 305-03 to form a closed ring and is fastened and fixed on the axial stress lug 305-03. The underside of the closed loop formed by wire rope 305-06 passes through the gap between head pulley 305-16 and loading bifurcation 305-07, i.e., head pulley 305-16 is mounted between the closed loops of wire rope 305-06.

When a high-frequency high-speed electric spindle reliability loading test is carried out, the high-frequency high-speed axial force loading electric cylinder 305-11 drives and pushes the supporting plate 305-13 to move upwards, the supporting plate 305-13 drives the push plate 305-08 to move upwards, the push plate 305-08 drives the loading fork 305-07 to move upwards, the loading fork 305-07 drives the top wheel 305-16 to move, when the top wheel 305-16 contacts the steel wire rope 305-06, the steel wire rope 305-06 is slowly tensioned, the tensioned steel wire rope 305-06 applies an upward force to the axial force bearing lug 305-03, and the axial force bearing lug 305-03 transmits the force to the high-frequency high-speed loading unit 302, so that the axial force loading simulation of the high-frequency high-speed loading unit 302 is realized.

In summary, referring to fig. 9, the high-frequency high-speed radial mean force loading device 301 is installed at the left side of the low-frequency low-speed loading unit 302 and is connected to and contacted with the high-frequency high-speed loading unit 302 through the number 1 blind rivet 301-06 to apply a radial mean force; the high-frequency high-speed radial amplitude force loading device 303 is arranged on the right side of the high-frequency high-speed loading unit 302, is connected with the high-frequency high-speed loading unit 302 through a radial amplitude force loading ball socket 303-01 and applies radial amplitude force; the high-frequency high-speed axial force loading device 305 is arranged right below the high-frequency high-speed loading unit 302 and above the opposite-dragging torque loading device 304, is connected with the high-frequency high-speed loading unit 302 through an axial force bearing lug 305-03 and is in contact with the high-frequency high-speed loading unit 302 and applies axial force; the counter-dragging torque loading device 304 is arranged right below the high-frequency high-speed axial force loading device 305 and is connected with the high-frequency high-speed loading unit 302 through a coupler 304-03 to be in contact with the high-frequency high-speed loading unit 302 and apply torque;

when a high-frequency high-speed electric spindle reliability loading test is carried out, a high-frequency high-speed radial mean force loading device 301 loads a high-frequency high-speed loading unit 302 by pulling a steel wire rope 301-05 and further pulling a No. 1 pull nail 301-06, an amplitude vibration table 303-04 in the high-frequency high-speed radial amplitude force loading device 303 acts on a high-frequency high-speed loading unit loading ball head 303-06 through a radial amplitude force loading ball socket 303-01 on a flexible loading rod 303-02 to realize the radial amplitude force loading of the high-frequency high-speed loading unit 302, a dragging torque loading device 304 controls the rated output torque of a dragging torque loading electric spindle 304-02 to realize the torque loading of the high-frequency high-speed loading unit 302, and a high-frequency high-speed axial force loading device 305 pushes a support plate 305-13 through a high-frequency high-speed axial force loading electric cylinder 305-11 to push a top wheel 305-16 to move to contact with the steel wire rope 305-06 The axial force-06 is applied to the axial force-receiving lug 305-03 by an axial force, and then is transmitted to the high-frequency high-speed loading unit 302 to load the axial force on the high-frequency high-speed loading unit 302. Therefore, under the combined action of the high-frequency high-speed radial mean force loading device 301, the high-frequency high-speed radial amplitude force loading device 303, the drag torque loading device 304 and the high-frequency high-speed axial force loading device 305, the high-frequency high-speed loading unit 302 can be comprehensively simulated and loaded, and further the static and dynamic high-frequency high-speed comprehensive simulation loading of different forces on the electric spindle under multiple working conditions can be truly simulated.

5. Reliability test system for electric spindle broach mechanism

Referring to fig. 17, the reliability test system 4 for the electric spindle broach mechanism according to the present invention includes 8 weight blocks 401, 8 broach mechanism simulation tool shanks 402 with the same structure, 8 tool shank installation bases 403 with the same structure, 8 broach force dynamometers 404 with the same structure, a gear installation base 405, a top plate 406, 2 top plate guide sleeves 407 with the same structure, 2 top plate guide posts 408 with the same structure, a speed reduction motor 409, an electric cylinder 410, 4 guide post fixing sleeves 411 with the same structure, a base 412, 4 support plate guide posts 413 with the same structure, a support plate 414, 4 guide post anti-slip sleeves 415 with the same structure, and a turntable 416; wherein: the tool shank mounting seat 403 comprises a bearing end cover 403-01, a sealing ring 403-02, a No. 5 bearing 403-03 and a No. 3 sleeve 403-04; the gear mounting seat 405 comprises a transmission shaft 405-01, a bull gear locking nut 405-02, a No. 4 gasket 405-03, a bull gear 405-04, a No. 6 bearing 405-05, a pinion locking nut 405-06, a No. 5 gasket 405-07, a pinion 405-08 and a No. 7 bearing 405-09; a sealing ring 403-02, a No. 5 bearing 403-03, a No. 3 sleeve 403-04, a bull gear locking nut 405-02, a No. 4 gasket 405-03, a No. 6 bearing 405-05, a pinion gear locking nut 405-06 and a No. 5 gasket 405-07 are all standard parts.

The base 412 is a square flat plate, the left side and the right side of the base 412 are symmetrically provided with grooves with the same structure and open outer sides, the bottom of each groove is provided with 1 strip-shaped through hole, a bolt is inserted into each strip-shaped through hole to fix the base 412 on the ground flat iron 5, namely, the reliability test system 4 of the electric spindle broach mechanism is fixed on the ground flat iron 5 through the

base

412, 4 round grooves with the same structure are arranged at 4 corners of the base 412, the diameter of each groove is the same as the diameter of the cross section of the guide column 413 of the support plate, and 4 threaded holes with the same structure are uniformly arranged at the periphery of each groove;

the guide post fixing seat 411 is a circular ring-shaped structural member, 4 bolt holes with the same structure are uniformly arranged on the guide post fixing seat 411 and are aligned and concentric with 4 threaded holes with the same structure around the groove of the base 412, and the radius of a middle through hole of the circular ring is the same as that of the cross section of the guide post 413 of the support plate;

the support plate guide column 413 is a long cylindrical straight rod structure with an equal cross section, 4 support plate guide columns 413 with the same structure are installed in a groove on the base 412, the guide column fixing seat 411 is sleeved on the guide column 411 and is aligned and concentric with a threaded hole near the groove of the base 412, and a bolt is inserted into a bolt hole of the guide column fixing seat 411 to fix the guide column fixing seat 411 and the support plate guide column 413 on the base 412.

The support plate 414 above the electric cylinder 410 is also a square flat plate, through holes are arranged at four corners of the support plate 414, threaded holes are uniformly arranged on the upper and lower end surfaces around the through holes at the four corners of the support plate 414, the threaded holes are aligned and concentric with the bolt holes on the

anti-skid sleeves

415, 4 through holes on the support plate 414 are aligned with 4 circular grooves on the

base

412, and 4 support plate guide posts 413 are inserted into 4 through holes with the same structure on the support plate 414 and are sleeved and fixed by the upper and lower anti-skid sleeves 415; the anti-slip cover 415 is a circular ring structure, and the anti-slip cover 415 is uniformly provided with bolt holes along the circumferential direction, and is installed on the upper and lower end surfaces of the support plate 414 and is connected and fixed with the support plate 414 by bolts.

Referring to fig. 18, the gear mounting seat 405 is located on the supporting plate 414, and mainly functions to drive the tool holder rotating disc 416 to rotate through gear transmission, and the gear mounting seat 405 includes a supporting shaft 405-01, a large gear locking nut 405-02, 2 number 4 gaskets 405-03 with the same structure, a large gear 405-04, a number 6 bearing 405-05, a small gear locking nut 405-06, 2 number 5 gaskets 405-07 with the same structure, a small gear 405-08, and a number 7 bearing 405-09.

The supporting shaft 405-01 is a step shaft, which is installed at the geometric center of the supporting plate 414, and the upper end and the lower end of the supporting shaft are both provided with key slots; the center of the supporting plate 414 is provided with a circular step groove, a No. 6 bearing 405-05 is arranged in the groove, a big gear 405-04 is arranged on a supporting shaft 405-01 above the No. 6 bearing 405-05, the positioning is carried out through a shaft shoulder on the supporting shaft 405-01, the big gear 405-04 is in key connection with the supporting shaft 405-01, the upper side and the lower side of the big gear 405-04 are respectively sleeved with a No. 4 gasket 405-03, a big gear locking nut 405-02 is sleeved on the No. 4 gasket 405-03 for positioning and locking, a small gear 405-08 meshed and connected with the big gear 405-04 is positioned on the right side, a No. 5 gasket 405-07 and a small gear locking nut 405-06 are sleeved on the small gear 405-08 to realize positioning and locking, and another No. 5 gasket 405-07 and a No. 7 bearing 405-09 are sleeved on the lower side of the small gear 405-08; the speed reducer 409 is positioned below the supporting plate 414 and is fixedly connected with the supporting plate 414 through screws, a power output shaft of the speed reducer 409 is inserted into a small through hole of the supporting plate 414 and an inner ring hole of the No. 7 bearing 405-09, and the power output shaft of the speed reducer 409 is connected with the pinion 405-08 through keys to achieve power transmission.

The handle turntable 416 is a disc-shaped flat plate structure, a blind hole and a key groove are formed in the center of the bottom end of the handle turntable 416, and the handle turntable 416 is sleeved on the support shaft 405-01 and is connected with the support shaft through keys. When the speed reducer 409 is driven, the small gear 405-08 drives the large gear 405-04 to rotate, the large gear 405-04 drives the tool holder turntable 416 to rotate, and the tool holder turntable 416 drives the broaching mechanism to simulate the tool holder 402 to rotate, so that the tool changing operation of the broaching mechanism to simulate the tool holder 402 can be realized by controlling the speed reducer 409. The top of handle of a knife carousel 416 is provided with 8 circular ladder through-holes along the circumference evenly symmetrically, and handle of a knife mount pad 403 is all installed to every circular ladder through-hole, and the broach mechanism simulation handle of a knife 402 that the structure is the same is all installed to each handle of a knife mount pad 403, is furnished with different balancing weight 401 on the broach mechanism simulation handle of a knife 402, balancing weight 401 be a ring structure spare, the outside center of ring structure spare is provided with the screw hole, and the screw inserts the screw hole and fixes balancing weight 401 on broach mechanism simulation handle of a knife 402, and the upper and lower ring height of different balancing weight 401 is highly different, so weight is different to can simulate different broaches and carry out electric main shaft broach mechanism reliability test, thereby increased the richness of electric main shaft broach mechanism reliability test object and the variety of data.

Referring to fig. 19, the tool shank mounting seat 403 of the present invention includes a broach mechanism simulation tool shank 402, a support plate 416, a bearing end cap 403-01, a seal ring 403-02, a No. 5 bearing 403-03, a No. 3 sleeve 403-04, and a nut 403-05.

The simulated tool shank 402 of the broach mechanism and the low-frequency low-speed simulated tool shanks 202-08 have the same structure, and slightly different from the structure, the simulated tool shank 402 of the broach mechanism is provided with threaded holes at the upper part and the bottom of the lower stepped shaft for matching and connecting a balancing weight block 401 and a broach force dynamometer 404.

The No. 5 bearing 403-03 is arranged in a circular stepped through hole in the tool holder turntable 416, the No. 3 sleeve 403-04, the sealing ring 403-02 and the bearing end cover 403-01 are arranged above the No. 5 bearing 403-03, the bottom end face of the bearing end cover 403-01 is in contact connection with the upper end face of the outer ring of the No. 5 bearing 403-03, and the bottom end face of the flange plate on the bearing end cover 403-01 is in contact with the tool holder turntable 416 and is fixedly connected with the tool holder turntable 416 through screws. The lower end of the simulated tool shank 402 of the broach mechanism is provided with a broach force dynamometer 404, the upper end of the simulated tool shank 402 of the broach mechanism is provided with a short screw, the center of the bottom end of the simulated tool shank 402 of the broach mechanism is provided with a threaded hole, and the short screw sleeved with a nut 403-05 of the broach force dynamometer 404 is fixedly connected with the threaded hole in the center of the bottom end of the simulated tool shank 402 of the broach mechanism. When the reliability test of the electric spindle broach mechanism is carried out, the dynamometer can record the broach force in real time and feed the broach force back to the background computer control system for data processing such as storage.

The electric cylinder 410 positioned below the supporting plate 414 adopts a reentry guide frame servo electric cylinder with the model number of RKC80L-S50-M0, and has the advantages of stable loading, large load and the like, the electric cylinder 410 is a main power source for pushing the supporting plate 414 to move up and down, a top plate 406 arranged at the top end of the electric cylinder 410 is a rectangular flat plate, the top end surface of the top plate is contacted with the bottom end surface of the supporting plate 414, a circular groove is arranged in the middle of the rectangular flat plate and matched with a telescopic shaft of the electric cylinder 410, bolt holes are arranged at the front side and the rear side of the rectangle, and the bolt holes are concentric with threaded holes at the upper side of a guide column; two top plate guide posts 408 with the same structure are arranged at the front end and the rear end of the top plate 406, threaded holes are formed in the top ends of the top plate guide posts 408, and bolts are inserted into the bolt holes in the front end and the rear end of the top plate to fix the top plate guide posts 408 on the top plate 406. The structure of the top plate guide sleeve 407 is the same as that of the push plate guide sleeve 305-14, and the top plate guide sleeve 407 is mounted on a flat plate at the top end of the electric cylinder 410 below the top plate 406 and is fixed through bolts.

When the reliability test of the electric spindle broach mechanism is carried out, the electric cylinder 410 is started to drive the top plate 406 to move upwards, the supporting plate 414 moves along the direction of the supporting plate guide column 413 under the pushing of the top plate 406, the supporting plate 414 drives the whole tool shank turntable 416 to move upwards, and therefore the accurate control of the movement of the broach mechanism in the vertical direction of the simulated tool shank 402 can be achieved through the control of the electric cylinder 410.

To sum up, in the reliability test system for the electric spindle broach mechanism according to the present invention, the electric cylinder 410 is started to drive the top plate 406 to push the supporting plate 414 to move to a proper position along the vertical direction, the electric spindle mobile positioning system 1 drives the electric spindle 102-05 in the spindle clamping device 102 to cooperate with each other for performing broach test, after a cycle broach test data of the broach mechanism simulation handle 402 is collected, the electric spindle 102-05 is driven by the electric spindle mobile positioning system 1 to be separated from the broach mechanism simulation handle 402, at this time, the speed reducer 409 is driven to perform a broach operation, the speed reducer 409 drives the pinion 405-08 to rotate, the pinion 405-08 drives the bull gear 405-04 to rotate, the bull gear 405-04 drives the handle turntable 416 to rotate, the handle turntable 416 drives the broach mechanism simulation handle 402 to rotate to complete the broach operation, and after the broach operation is completed, the electric spindle 102-05 is matched with a new tool handle again to perform reliability test of the electric spindle broach mechanism under the driving of the electric spindle mobile positioning system 1, the above processes are repeated until the relevant test data of all tool handles are acquired, the electric cylinder 410 is started again after the test is completed, the support plate 414 is sent to the initial position, and the test is finished. By carrying out broach drawing experiments on the plurality of simulated tool handles, abundant data can be obtained, and data support is provided for later reliability detection and analysis of the electric spindle.

The embodiments of the present invention are described in order to facilitate those skilled in the art to understand and apply the present invention, and the present invention is merely an optimized example or a preferred embodiment. Equivalent structural changes or various modifications which do not require inventive work are within the scope of the present invention if those skilled in the art insist on the basic technical solution of the present invention.

Claims

1. A comprehensive electric spindle reliability loading test device is characterized by comprising an electric spindle moving and positioning system (1), a low-frequency low-speed electric spindle reliability loading test system (2), a high-frequency high-speed electric spindle reliability loading test system (3), an electric spindle broach mechanism reliability test system (4) and a ground iron (5);

the ground flat iron (5) is a cuboid plate-type casting, T-shaped grooves which are parallel to each other and have the same structure are formed in the top end of the ground flat iron (5), a weight reduction groove is formed in the bottom end of the ground flat iron (5), and two cuboid grooves are formed in the middle of the top end of the ground flat iron (5);

the electric spindle moving and positioning system (1) is arranged on a ground flat iron (5) through a No. 1 precision ball screw (101-A) and a No. 2 precision ball screw (101-B), the low-frequency low-speed electric spindle reliability loading test system (2) is arranged on the ground flat iron (5) between the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B), the high-frequency high-speed electric spindle reliability loading test system (3) is arranged on the ground flat iron (5) on the left side of the low-frequency low-speed electric spindle reliability loading test system (2), and the electric spindle broach mechanism reliability test system (4) is arranged on the ground flat iron (5) on the left side of the high-frequency high-speed electric spindle reliability loading test system (3); an electric spindle (102-05) in the electric spindle mobile positioning system (1), a low-frequency low-speed loading unit (202) in the low-frequency low-speed electric spindle reliability loading test system (2), a high-frequency high-speed loading unit (302) in the high-frequency high-speed electric spindle reliability loading test system (3) and 8 broach mechanism simulation tool handles (402) with the same structure in the electric spindle broach mechanism reliability test system (4) are perpendicular to a ground iron (5) in rotation axis.

2. The comprehensive electric spindle reliability loading test device according to claim 1, wherein the electric spindle moving and positioning system (1) further comprises an electric spindle simulation tool shank matching device (102) and a moving gantry (103);

the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B) are symmetrically arranged on the front side and the rear side of the ground flat iron (5) by adopting T-shaped bolts, and the longitudinal symmetrical surfaces of the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B) are parallel to the longitudinal symmetrical surface of the ground flat iron (5); the movable gantry (103) is installed on a No. 1 precision ball screw (101-A) and a No. 2 precision ball screw (101-B) by bolts through 3 connecting plates at the bottom ends of a front side pillar and a rear side pillar, and a front side screw rod nut seat and a rear side screw rod nut seat at the bottom ends of the connecting plates at the bottom ends of main pillars in the front side pillar and the rear side pillar of the movable gantry (103) and screw nuts on the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B) are assembled and fixed by screws; the electric spindle simulation tool handle matching device (102) is fixedly arranged on a middle cross beam of the movable gantry (103) through a No. 4 precision ball screw (102-B) in the electric spindle simulation tool handle matching device by bolts.

3. The comprehensive electric spindle reliability loading test device is characterized in that the electric spindle simulation tool holder matching device (102) further comprises a No. 3 precision ball screw (102-A), a unclamping cylinder (102-01), a vertical guide rail mounting plate (102-02), a spindle water jacket (102-03), a spindle newspaper holder (102-04) and a joint plate (102-06); wherein: the No. 3 precision ball screw (102-A) and the No. 4 precision ball screw (102-B) have the same structure;

the No. 4 precision ball screw (102-B) is horizontally and fixedly installed in the middle of a middle cross beam of the movable gantry (103) by bolts, the No. 3 precision ball screw (102-A) is fixed on the vertical guide rail installation plate (102-02) by bolts, a No. 3 guide rail sliding block in the No. 3 precision ball screw (102-A) is fixedly connected with a joint plate (102-06) by bolts, and the joint plate (102-06) provided with the No. 3 precision ball screw (102-A) is installed on a No. 4 guide rail sliding block in the No. 4 precision ball screw (102-B) by bolts;

the electric spindle (102-05) is arranged in the spindle water jacket (102-03) and fixedly connected by bolts, the spindle water jacket (102-03) provided with the electric spindle (102-05) is arranged in the spindle clamp (102-04) and fixedly connected by bolts, the top end of the electric spindle (102-05) is provided with the spindle unclamping cylinder (102-01), and the spindle clamp (102-04) is fixedly connected to the lower end of the left side wall of the vertical guide rail mounting plate (102-02) by bolts.

4. The comprehensive motorized spindle reliability loading test device according to claim 2, wherein the movable gantry (103) is a large-scale gantry structure manufactured by casting, the movable gantry (103) comprises a front side pillar, a rear side pillar and a middle cross beam, the top ends of the front side pillar and the rear side pillar and the two ends of the middle cross beam are vertically connected into a whole to form the gantry structure, the front side pillar and the rear side pillar have the same structure, the front side pillar and the rear side pillar both comprise a main pillar, a left auxiliary pillar and a right auxiliary pillar, the left auxiliary pillar and the right auxiliary pillar have the same structure, the left auxiliary pillar and the right auxiliary pillar are symmetrically arranged on the left side and the right side of the main pillar, and the top ends of the left auxiliary pillar and the right auxiliary pillar and the left side wall and the right side wall of the lower end of the main pillar are connected into a whole;

the bottom ends of the front side pillar and the rear side pillar are respectively fixed with 1 group of 3 connecting plates, wherein the connecting plates at the bottom ends of the left auxiliary pillar and the right auxiliary pillar have the same structure, each group of 3 connecting plates are rectangular plate structural members, each connecting plate is uniformly provided with 4 groups of 16 bolt holes, the 1 group of bolt holes and the 1 # precision ball screw (101-A) on each connecting plate are aligned and concentric with the threaded holes on the 1 # guide rail sliding block and the 2 # guide rail sliding block in the 2 # precision ball screw (101-B), the bottom center of the connecting plate of the main pillar in the front side pillar and the rear side pillar is fixed with a front side screw nut seat and a rear side screw nut seat which are assembled by the 1 # precision ball screw (101-A) and the 2 # precision ball screw (101-B), and the movable gantry (103) adopts screws and passes through the front side pillar, the rear side pillar and the movable gantry, And 3 connecting plates at the bottom end of the rear side pillar are fixedly connected with 12 No. 1 guide rail sliding blocks with the same structure and 12 No. 2 guide rail sliding blocks with the same structure on a No. 1 precision ball screw (101-A) and a No. 2 precision ball screw (101-B).

5. A comprehensive electric spindle reliability loading test device according to claim 1, characterized in that the low-frequency low-speed electric spindle reliability loading test system (2) further comprises a low-frequency low-speed radial force loading device (201), a low-frequency low-speed torque loading device (203) and a low-frequency low-speed axial force loading device (204);

the low-frequency low-speed radial force loading device (201) is fixed on a ground flat iron (5) through a support plate (201-04) therein; the low-frequency low-speed loading unit (202) is vertically arranged on the front side of the low-frequency low-speed radial force loading device (201), the low-frequency low-speed axial force loading device (204) is arranged on the front side of the low-frequency low-speed loading unit (202), and the low-frequency low-speed torque loading device (203) is arranged on a ground flat iron (5) on the right side of the low-frequency low-speed loading unit (202) through a dynamometer base (203-02) in the low-frequency low-speed loading unit;

a low-frequency low-speed radial force loading ball socket (201-05) on the low-frequency low-speed radial force loading device (201) is aligned and concentric with a low-frequency low-speed radial force loading ball head (201-06) arranged on a low-frequency low-speed loading unit (202), a dynamometer (203-01) in a low-frequency low-speed torque loading device (203) is arranged on a dynamometer base (203-02), and a transmission shaft of the dynamometer (203-01) is connected with a No. 1 bevel gear (202-14) on the low-frequency low-speed loading unit (202) through a key; the low-frequency low-speed axial force loading device (204) is symmetrically fixed on a bearing sleeve (202-02) of the low-frequency low-speed loading unit (202) through a loading branch (204-07) in the low-frequency low-speed axial force loading device and 2 lever pull nails (204-06) with the same structure.

6. The comprehensive electric spindle reliability loading test device is characterized in that the low-frequency low-speed radial force loading device (201) comprises a radial electro-hydraulic servo loader (201-01), an intermediate force plate (201-02), 2 supports (201-03) with the same structure, a support plate (201-04), a low-frequency low-speed radial force loading ball socket (201-05) and a low-frequency low-speed radial force loading ball head (201-06);

the device comprises 2 supports (201-03) with the same structure, a support plate (201-04), a middle force plate (201-02), a radial electrohydraulic servo loader (201-01), a middle force plate (201-02) and the tops of the 2 supports (201-03) with the same structure, wherein the 2 supports (201-03) with the same structure are symmetrically arranged at the left end and the right end of the support plate (201-04), the bottom ends of the 2 supports (201-03) with the same structure are connected with the left end and the right end of the support plate (201-04) through bolts, the middle force plate (201-02) is arranged at the top ends of the 2 supports (201-03) with the same structure, and the radial electrohydraulic servo loader (201-01) and the middle force plate (201-02) are sequentially connected in a contact manner and fixedly connected with the bolts; the low-frequency low-speed radial force loading ball socket (201-05) is arranged on a force sensor at the rightmost end of the radial electro-hydraulic servo loader (201-01), and the low-frequency low-speed radial force loading ball head (201-06) is arranged on the low-frequency low-speed loading unit (202).

7. The comprehensive motorized spindle reliability loading test device according to claim 5, wherein the low-frequency low-speed axial force loading device (204) comprises an axial electro-hydraulic servo loader (204-01), a low-frequency low-speed axial force loading ball head (204-02), a low-frequency low-speed axial force loading ball socket (204-03), a lever support seat (204-04), a lever (204-05), a lever pull nail (204-06) and a loading fork (204-07);

an axial electro-hydraulic servo loader (204-01) is vertically arranged in a cuboid groove arranged in the middle of a ground flat iron (5) and fixedly connected to the ground flat iron (5) by bolts, a lever supporting seat (204-04) is arranged on the ground flat iron (5) on the left side of the axial electro-hydraulic servo loader (204-01) and fixedly connected by bolts, a lever (204-05) is arranged on a supporting shaft (204-04-05) of the lever supporting seat (204-04) by a through hole in the middle of the lever (204-05) for rotary connection, a low-frequency low-speed axial force loading ball head (204-02) is fixedly connected to the rightmost end of the lever (204-05) by threads and is concentric with a spherical groove of a low-frequency low-speed axial force loading ball socket (204-03) fixed at the top end of the axial electro-hydraulic servo loader (204-01), the loading branch (204-07) is arranged at the leftmost end of the lever (204-05), and 2 lever pull nails (204-06) with the same structure are symmetrically arranged on the loading branch (204-07), and are in rotary connection.

8. A comprehensive electric spindle reliability loading test device according to claim 1 or 5, the low-frequency low-speed loading unit (202) is characterized by comprising a bearing upper end cover (202-01), a bearing sleeve (202-02), a bearing lower end cover (202-03), a number 1 bearing (202-04), a number 1 gasket (202-05), a number 1 locking nut (202-06), a number 1 sleeve (202-07), a low-frequency low-speed simulation tool shank (202-08), a number 2 bearing (202-09), a bearing retainer ring (202-10), a number 2 gasket (202-11), a number 2 locking nut (202-12), a shaft sleeve (202-13), a number 1 conical gear (202-14), a number 2 conical gear (202-15) and a number 3 bearing (202-16);

an upper end cover (202-01) of a bearing, a bearing sleeve (202-02) and a lower end cover (202-03) of the bearing are sleeved on a low-frequency low-speed simulation cutter handle (202-08) from top to bottom, 2 bearings (202-09) with the same structure, a bearing retainer ring (202-10), a gasket (202-11) and a lock nut (202-12) with the same structure are positioned on the upper end cover (202-01) of the bearing, the inner sides of the bearing sleeve (202-02) and the lower end cover (202-03) of the bearing, and are sleeved on the low-frequency low-speed simulation cutter handle (202-08) from top to bottom, the bearing retainer ring (202-10) is positioned among the 2 bearings (202-09) with the same structure, and the upper end face and the lower end face of the bearing retainer ring (202-10) are respectively positioned at the lower part of an outer bearing ring of the 2 bearings (202-09) with the same structure, The upper end surfaces of the No. 2 bearing (202-09) and the No. 2 locking nut (202-12) are in contact connection, the No. 2 gasket (202-11) is arranged between the No. 2 bearing (202-09) and the No. 2 locking nut (202-12) which are positioned below, the upper end surface and the lower end surface of the No. 2 gasket (202-11) are in contact connection with the bottom end surface of the inner bearing ring of the No. 2 bearing (202-09) and the top end surface of the No. 2 locking nut (202-12) which are positioned below respectively, the top end surface of the inner bearing ring of the No. 2 bearing (202-09) which is positioned above is in contact connection with the upper shaft shoulder on the low-frequency low-speed simulation tool handle (202-08), the No. 2 locking nut (202-12) is in threaded connection with the low-frequency low-speed simulation tool handle (202-08), the inner part of the bearing ring of the No. 2 bearing (202-09) with the same structure is in static fit with the low-frequency low-speed simulation tool handle (202-08), the outer bearing ring of the No. 2 bearing (202-09) with the same structure is in contact with the bearing sleeve (202-02) The upper end cover (202-01) and the lower end cover (202-03) of the bearing are respectively fixedly connected with the top end and the bottom end of the bearing sleeve (202-02) by screws in a transition fit manner;

the bearing 1 (202-04) is sleeved on the low-frequency low-speed simulation tool handle (202-08), the top end face of an inner bearing ring of the bearing 1 (202-04) is in contact connection with a shaft shoulder at the middle position of the low-frequency low-speed simulation tool handle (202-08), the bevel gear 1 (202-14) is sleeved on the low-frequency low-speed simulation tool handle (202-08) and is in key connection with the shaft shoulder at the lower end position of the low-frequency low-speed simulation tool handle (202-08), the shaft sleeve (202-13) is installed between the bearing 1 (202-04) and the bevel gear 1 (202-14), a gasket 1 (202-05) and a locking nut 1 (202-06) are installed below the bevel gear 1 (202-14), and the bearing 1, the bevel gear 1 and the bevel gear 1 (202-04) are in contact connection in sequence; no. 2 conical gear (202-15) and No. 3 bearing (202-16) are sleeved on a transmission shaft of a dynamometer (203-01) in a low-frequency low-speed torque loading device (203), No. 1 sleeve (202-07) is sleeved on the transmission shaft of the dynamometer (203-01) between the No. 2 conical gear (202-15) and the No. 3 bearing (202-16), the three are sequentially in contact connection, and the No. 1 conical gear (202-14) and the No. 2 conical gear (202-15) are in meshing connection.

9. The comprehensive electric spindle reliability loading test device according to claim 1, wherein the high-frequency high-speed electric spindle reliability loading test system (3) further comprises a high-frequency high-speed radial mean force loading device (301), a high-frequency high-speed radial amplitude force loading device (303), a drag torque loading device (304) and a high-frequency high-speed axial force loading device (305);

the high-frequency high-speed radial mean force loading device (301) is fixed on a ground flat iron (5) through a mean cylinder support seat (301-02) in the high-frequency high-speed radial mean force loading device (301) by bolts, the high-frequency high-speed radial amplitude force loading device (303) is installed on the right side of the high-frequency high-speed radial mean force loading device (301) and is fixedly connected with the ground flat iron (5) through a bolt in an amplitude vibration table (303-04), a high-frequency high-speed loading unit (302) is installed between the high-frequency high-speed radial mean force loading device (301) and the high-frequency high-speed radial amplitude force loading device (303), a No. 1 pull nail (301-06) in the high-frequency high-speed radial mean force loading device (301) is fixedly installed on the left side of a bearing sleeve (302-01) in the high-frequency high-speed loading unit (302), and a radial amplitude force loading ball socket (303-01) and a high-frequency high-speed loading unit (302) on the right side are fixedly installed in the high-frequency high-speed radial amplitude force loading device (303) The high-frequency high-speed loading unit stress ball heads (303-06) are assembled and concentrically aligned, the high-frequency high-speed axial force loading device (305) is arranged right below the high-frequency high-speed loading unit (302) and is fixedly arranged on a ground flat iron (5) through 2 guide column supporting seats (305-01) with the same structure, and the upper end of the high-frequency high-speed axial force loading device (305) is fixedly connected with the front side and the rear side of a bearing sleeve (302-01) in the high-frequency high-speed axial force loading device (305) through 2 axial stress lug assemblies with the same structure; the counter-dragging torque loading device (304) is located between 2 guide post supporting seats (305-01) with the same structure, the counter-dragging torque loading device (304) is fixedly connected with a groove in a ground flat iron (5) through a counter-dragging electric main shaft clamp (304-01) by adopting a bolt, and a coupler (304-03) at the top end of the counter-dragging torque loading device (304) is connected with a stepped shaft at the lower end of a high-frequency high-speed simulation tool handle (304-04) in a high-frequency high-speed loading unit (302) in a matching mode.

10. The comprehensive electric spindle reliability loading test device according to claim 9, wherein the high-frequency high-speed radial mean force loading device (301) comprises a mean value electric cylinder (301-01), a mean value electric cylinder supporting seat (301-02), an electric cylinder connecting sleeve (301-03), a force measuring sensor (301-04), a loading steel wire rope (301-05), a No. 1 pull nail (301-06) and a No. 2 pull nail (301-07);

the mean value electric cylinder (301-01) is installed on a supporting flat plate in a mean value electric cylinder supporting seat (301-02), the right side of the mean value electric cylinder (301-01) is fixed on a supporting wall in the mean value electric cylinder supporting seat (301-02) through screws, the right end of a telescopic shaft of the mean value electric cylinder (301-01) is inserted into a through hole in the upper end of the supporting wall in the mean value electric cylinder supporting seat (301-02) and then is assembled and connected with a threaded hole in the left end of an electric cylinder connecting sleeve (301-03), a short screw rod in the right side of the electric cylinder connecting sleeve (301-03) is assembled and connected with a threaded hole in the left side of a force measuring sensor (301-04), a threaded hole in the right end of the force measuring sensor (301-04) is assembled and connected with a short screw rod in the left side of a No. 2 pull nail (301-07), and the left and right ends of a loading steel wire rope (301-05) are fixedly connected into a steel after passing through central through holes of the No. 2 pull nail (301-07) and the No. 1 pull nail (301-06) respectively The wire rope closes the ring.

11. A comprehensive motorized spindle reliability loading test apparatus as recited in claim 9, the high-frequency high-speed axial force loading device (305) is characterized by further comprising 2 guide post supporting seats (305-01) with the same structure, an axial force sensor (305-02), 2 branches (305-07) with the same structure, a push plate (305-08), a nut (305-09), a pull rod (305-10), a high-frequency high-speed axial force loading electric cylinder (305-11), 4 guide post fixing sleeves (305-12) with the same structure, a supporting plate (305-13), 2 push plate guide sleeves (305-14) with the same structure, 2 push plate guide posts (305-15) with the same structure, 2 top wheels (305-16) with the same structure and 2 steel pins (305-17) with the same structure;

the device is characterized in that 2 guide post supporting seats (305-01) with the same structure are symmetrically distributed on the left side and the right side, 2 push plate guide posts (305-15) with the same structure are symmetrically arranged in semi-cylindrical grooves at the upper end and the middle of the 2 guide post supporting seats (305-01) with the same structure by adopting 4 guide post fixing sleeves (305-12) with the same structure and bolts, a supporting plate (305-13) is sleeved on the 2 push plate guide posts (305-15) with the same structure through 2 push plate guide sleeves (305-14) with the same structure, an axial force sensor (305-02) is arranged at the center of the top end face of the supporting plate (305-13) and is fixed by adopting bolts, a push plate (305-08) is fixed at the center of the top end of the axial force sensor (305-02) by adopting bolts, and the bottom ends of 2 loading branches (305-07) with the same structure are fixed at the top of the push plate (305-08) by adopting bolts The front end and the rear end of the loading fork are provided, the upper ends of 2 loading forks (305-07) with the same structure are rotatably connected with 2 top wheels (305-16) with the same structure by 2 steel pins (305-17) with the same structure, 2 axial stress lug assemblies with the same structure are sleeved at the upper ends of the 2 loading forks (305-07) with the same structure, and 4 steel wire ropes (305-06) with the same structure in the 2 axial stress lug assemblies with the same structure are positioned above and below the 2 top wheels (305-16) with the same structure; the high-frequency high-speed axial force loading electric cylinder (305-11) is arranged below the right lower corner of the support plate (305-13), the lower end of the pull rod (305-10) is in threaded connection with the output end of the telescopic shaft of the high-frequency high-speed axial force loading electric cylinder (305-11), and the upper end of the pull rod (305-10) is inserted into the bolt hole in the right lower corner of the support plate (305-13) and is locked and fixed by the locking nut (305-09).

12. The comprehensive electric spindle reliability loading test device according to claim 1, wherein the electric spindle broach mechanism reliability test system (4) further comprises 8 balancing weights (401), 8 tool holder mounting seats (403) with the same structure, 8 dynamometers (404) with the same structure, a gear mounting seat (405), a top plate (406), 2 top plate guide sleeves (407) with the same structure, 2 top plate guide posts (408) with the same structure, a speed reducing motor (409), an electric cylinder (410), 4 guide post fixing sleeves (411) with the same structure, a base (412), 4 support plate guide posts (413) with the same structure, a support plate (414), 4 guide post anti-skid sleeves (415) with the same structure and a turntable (416);

the base (412) is fixed on a ground flat iron (5) by bolts, the bottom ends of 4 supporting plate guide posts (413) with the same structure are arranged at the four corners of the base (412), the 4 supporting plate guide posts (413) with the same structure are vertical to the base (412), 4 guide post fixing sleeves (411) with the same structure are sleeved at the lower ends of the 4 supporting plate guide posts (413) with the same structure, and the 4 guide post fixing sleeves (411) with the same structure are fixedly connected on the base (412) by bolts;

the support plate (414) is sleeved on 4 support plate guide posts (413) with the same structure through guide post anti-slip sleeves (415) arranged at four corners; the gear mounting base (405) is rotatably connected with the center of the supporting plate (414) through a supporting shaft (405-01) in the gear mounting base, the turntable (416) is mounted at the top end of the supporting shaft (405-01), the two supporting shafts are in key connection, 8 tool handles (402) with the same structure are mounted in 8 circular stepped through holes in the turntable (416) through 8 tool handle mounting bases (403) with the same structure, 8 balancing weights (401) are sleeved on the 8 tool handles (402) with the same structure, and the 8 dynamometers (404) with the same structure are mounted in threaded holes in the centers of the bottom ends of the 8 tool handles (402) with the same structure through threaded connection; the speed reducing motor (409) is arranged below the supporting plate (414) and fixedly connected with the supporting plate (414) by screws, a power output shaft of the speed reducing motor (409) is inserted into a small through hole of the supporting plate (414) and an inner ring hole of the bearing (405-09), and the power output shaft of the speed reducing motor (409) is connected with a pinion (405-08) in the gear mounting seat (405) by keys;

the electric cylinder (410) is arranged on a base (412) right below the center of the supporting plate (414), a telescopic shaft of the electric cylinder (410) is fixedly connected with the center of the rectangular flat plate type top plate (406), two top plate guide columns (408) with the same structure are fixedly connected with the front end and the rear end of the top plate (406) by bolts, and the two top plate guide columns (408) with the same structure are arranged in 2 guide sleeves (407) with the same structure on the electric cylinder (410) and are in sliding connection.