CN114088397A

CN114088397A - Thrust bearing performance test device based on similar theory

Info

Publication number: CN114088397A
Application number: CN202111493223.2A
Authority: CN
Inventors: 李强; 李斌; 刘清磊; 李秀伟; 杜玉晶; 谢群涛; 许伟伟; 刘兆增
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-02-25
Anticipated expiration: 2041-12-08
Also published as: CN114088397B

Abstract

The invention aims to provide a thrust bearing performance test experimental device and a test method based on a similar theory, aims to solve the problems that a 1:1 test bed in the prior art is too large in size, cannot perform various bearing tests, is too high in test cost and the like, and provides tests and evaluations for more conveniently inspecting and evaluating the performance of a thrust bearing; the device comprises a transmission system, a bearing testing device and a loading system, wherein the transmission system, the bearing testing device and the loading system are sequentially arranged from top to bottom by taking a test bench as a basic frame; the transmission system is connected with the rotating shaft and provides rotating speed and torque required by a test for the rotating shaft, and the rotating shaft downwards penetrates through the bearing testing device and the loading system; the loading system provides an external loading force.

Description

Thrust bearing performance test device based on similar theory

Technical Field

The invention relates to the field of a test device for testing the performance of an oil lubrication thrust bearing, in particular to a test device for testing the performance of a thrust bearing based on a similar theory.

Background

Tilting pad thrust bearings are often used for high thrust load rotating machines, such as nuclear main pumps, energy storage units and the like, and the working performance of the tilting pad thrust bearings is good or bad and whether the units run safely or not is determined. The thrust bearing is widely used by means of pressure generated by lubricating oil between the sliding surface and the thrust pad, canceling out an external load applied to the sliding surface, thereby preventing the two surfaces from coming into contact. With the continuous progress of technology and the rapid development of industrial production, rotary machines are becoming larger and more complicated, and bearings, which are essential parts in rotary machines, are most likely to fail due to inevitable wear of rotary motion. Therefore, the quality and reliability of the thrust bearing are more and more emphasized, the life test and performance evaluation of the bearing are regarded as important, and particularly for the bearing under special working conditions, the performance test becomes a key link of the quality control of the whole set of tools. In the process of independently developing the motor of the unit, the design and verification problems of the bearing need to be involved, the risk of verification in actual operation of the unit is too high, the bearing cannot be verified in all working conditions, and the test cost is improved. In the current thrust bearing verification process, a 1:1 test bed is mostly adopted for verification, namely the structure of the thrust bearing, namely the actual operation parameters are kept consistent, and although the 1:1 test bed can better meet the bearing performance test, the test bed has higher construction cost and no universality.

Disclosure of Invention

The invention aims to provide a thrust bearing performance test experimental device based on a similar theory, aims to solve the problems that a 1:1 test bed in the prior art is too large in size, cannot perform various bearing tests, is too high in test cost and the like, and provides tests and evaluations for more conveniently inspecting and evaluating the performance of a thrust bearing.

In order to solve the technical problem, the technical scheme of the invention is realized as follows:

a thrust bearing performance test device based on a similar theory is characterized in that an original bearing model structure is subjected to 2:1 or 4:1 similar reduction according to actual requirements, test working condition parameters are calculated on the basis of the principle that the specific pressure of a bearing is equal and the linear speed is consistent based on the difference of structural parameters of bearings before and after reduction, the test result can correspond to the test result of the bearing under the actual working condition, and the test device is designed by depending on the reduced bearing.

The thrust bearing performance test device comprises a test bench, a transmission system, a bearing test device and a loading system. The loading system, the bearing testing system and the transmission system are vertically arranged on the test bed, the transmission system is installed on the upper portion of the test bed, the bearing testing system is installed in the middle of the test bed, and the loading system is installed on the lower portion of the test bed.

The test bench is formed by connecting rigid square pipes with different sizes and lengths, and the wall surface of each square pipe is provided with a round hole, so that other parts can be conveniently fixed. The test bench is characterized in that a motor is fixed on the upper portion of the test bench, the motor provides torque and rotating speed required by the test bench, meanwhile, a rotating shaft of the motor is connected with one end of a coupler, and the other end of the coupler is connected with a transmission main shaft of the test bench.

A thrust bearing is arranged in the bearing testing device, and a plurality of temperature sensors are embedded and distributed on the back of the bearing bush to realize the measurement of the temperature of the bearing bush; the lower end of the bearing is positioned with a rotating mirror plate, the rotating mirror plate and the main shaft synchronously move, and a pressure sensor and a displacement sensor are embedded on the surface of the mirror plate to realize the measurement of the oil film pressure and the thickness of the bearing. The bearing testing device is provided with a circulating oil path which supplies lubricating oil required by the thrust bearing to provide lubrication and cooling.

The loading system provides loads required by tests, the loads are provided by a hydraulic loading system commonly used in the prior art, the hydraulic loading system is loaded by a piston type hydraulic cylinder, the pressure of the loading system is adjustable, and the pressure is measured by a pressure sensor. The vertical load transfer process is that a hydraulic oil cylinder acts on a thrust tile, a main shaft drives a thrust head to rotate, so that a static pressure bearing applies load to the thrust head through oil film dynamic pressure, and the thrust head, the main shaft and a mirror plate are relatively fixed in position, so that the load is finally applied to the mirror plate.

As a preferred embodiment, the test bench comprises a bench base, a bench partition, a bench top plate, a bench cross beam and a stand column. The base of the rack is a hollow ribbed slab framework structure, the upper surface and the lower surface of the rack are flat plates, and the middle of the rack is supported by ribbed slabs. The rack partition is a horizontal flat plate and is arranged among different systems. The top plate of the rack is a horizontal flat plate and is fixed and arranged on the upper part of the rack. The stand equipartition is in test bench four corners to rely on the position around the flat board. The end part of the cross beam of the rack is connected with the upright post, and the wall surface of the cross beam of the rack and the flat plate are respectively provided with corresponding bolt holes, so that the stability of the whole structure is further ensured. The base frame structure formed by the bench top plate, the bench base, the bench cross beam and the stand column is used for bearing axial load during testing, so that a pressing load is provided for the test bearing.

As a preferred embodiment, the transmission device is driven by a conventional variable-frequency alternating current motor, and the forward and reverse rotation and the rotating speed of the motor can be adjusted. The motor is placed on the upper portion of the test bed and fixed with the top plate of the test bed, a motor shaft of the motor is connected with one end of a coupler, and the other end of the coupler is connected with the main shaft. The main shaft vertically penetrates through the rack base, the rack partition plate and the rack top plate.

As a preferred embodiment, the main shaft is vertically arranged, and two linear positioning bearings are arranged in the axial direction of the main shaft, and the main shaft sequentially penetrates through the linear positioning bearings. The first linear positioning bearing is in contact with a first partition plate of the rack, and the second linear positioning bearing is in contact with a base of the rack. The linear bearing can restrain circumferential vibration of the rotating shaft and position the rotating shaft on one hand, and on the other hand, axial movement of the rotating shaft can be achieved.

In a preferred embodiment, the bearing test device is located between the first stage partition and the second stage partition, and comprises a test oil tank, a test bearing, a mirror plate, an end cover, a fixing ring and a sealing device. The test oil tank is a cylindrical hollow cavity, the rotating shaft penetrates through the cavity, the end covers are respectively an upper end cover and a lower end cover, the upper end cover is in contact fit with the upper portion of the test oil tank, an oil inlet hole and a specific-density hole are formed in the wall surface of the upper end cover, the lower end cover is in contact fit with the lower portion of the test oil tank, and a sealing hole which is slightly larger than the diameter of the rotating shaft is formed in the surface of the lower end cover. The runner plate is a circular flat plate, an open slot is formed in the inner circle of the runner plate and is sleeved on the rotating shaft, a step and a key groove are formed in the end of the rotating shaft, the lower surface of the runner plate is abutted to the surface of the step, and the runner plate and the rotating shaft are connected through keys to achieve synchronous rotation.

As an embodiment of one kind, loading system is located lower part in the test bench, including loading cylinder, hydrostatic bearing and thrust collar, the thrust collar is fixed through the parallel key with the pivot butt, realizes synchronous rotation and axial displacement, loading cylinder fixes on loading device's bottom plate to evenly arrange a plurality ofly along circumference, provide high pressure oil by outside hydraulic power unit, realize going upward and descending of pneumatic cylinder piston, the hydrostatic bearing lower extreme is connected with loading cylinder, realizes the lubrication between hydrostatic bearing and the thrust collar through adjusting outside pump power oil pressure.

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

(1) the test bed has small integral volume, the size of the test bed is reduced on the basis of ensuring the test precision, and the test cost is saved;

(2) the whole device has higher modularization degree and can be repeatedly used or replaced with similar size;

(3) the loading system has stable performance, adopts an external pump station for pressurization, and realizes lubrication by a hydrostatic bearing;

(4) the application range is wide, and the performance test of the bearing under various start-stop environments can be realized.

Drawings

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

FIG. 1 is an overall three-dimensional schematic diagram of a thrust bearing performance test device according to the present invention.

FIG. 2 is an overall cross-sectional view of the thrust bearing performance test device of the present invention.

FIG. 3 is a schematic view of a bearing testing device of the thrust bearing performance testing device of the present invention.

FIG. 4 is a schematic view of a loading system of the thrust bearing performance test device of the present invention.

In the figure: 1. the test bed comprises a transmission system, a test bed frame, a first positioning bearing, a bearing testing device, a loading system, a first positioning bearing, a second positioning bearing, a test bed base and a second positioning bearing, wherein the transmission system 2 is connected with the test bed frame 3;

11. the alternating current motor 12, the motor cover 13, the coupler 14 and the rotating shaft;

21. the rack comprises a rack top plate, 22, a first rack partition plate, 23, a rack cross beam, 24, a second rack partition plate, 25, a stand column, 26 and a third rack partition plate;

31. the device comprises a temperature sensor, a pressure sensor, a displacement sensor, a conductive slip ring, a rotor, a stator and a pressure sensor, wherein the temperature sensor is 32, the pressure sensor is 33, the displacement sensor is 34, and the rotor is 34A;

41. the oil tank comprises a sealing upper gland 42, an upper end cover packing seal 43, an oil tank upper end cover 44, a thrust bearing fixing ring 45, a thrust bearing 46, a runner plate 47, an oil tank 48, a lower end cover packing seal 49, an oil tank lower end cover 50 and a sealing lower gland;

51. the thrust collar fixing ring 52, the oil outlet pipe 53, the thrust collar 54, the hydrostatic bearing 55, the loading oil cylinder 56, the oil inlet pipe 57, the loading oil tank 58, the oil cylinder connector 59 and the sealing sleeve.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the disclosure herein.

Referring to the drawings, the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present disclosure can be implemented, so that the present disclosure has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the disclosure of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. Meanwhile, the positional limitation terms used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship therebetween may be regarded as the scope of the present invention without substantial changes in the technical content.

As shown in FIG. 1, the thrust bearing performance test device based on the similar theory comprises a transmission system 1, a bearing test device 4, a loading system 5, a test bed base 6 and a test bed frame 2. The transmission system 1, the bearing testing device 4, the loading system 5 and the test bed base 6 are sequentially arranged in a vertical sequence by taking the test bed frame 2 as a basic frame; the test bench is characterized in that the transmission system 1 is installed on the upper portion of the test bench 2, the bearing testing device 4 is installed below the transmission system, namely, the inside of the test bench 2, the loading system 5 is connected with the bearing testing device 4 and installed on the lower portion of the bearing testing device 4, and the test bench base is connected with the loading system 5 and installed on the lower portion of the loading system 5. The loading system 5 provides the external loading force required by the test, and the transmission system provides the rotating speed and the torque required by the test.

As shown in fig. 1 and 2, the test bed 2 comprises three layers of

bed partition boards

22, 24 and 26, a bed top board 21, a plurality of bed cross beams 23 and four upright posts 25; the four stand columns 25 support the three-layer

rack partition plates

22, 24 and 26 and the rack top plate 21 into a layered plate type structure, and the rack cross beams 23 are connected between the four stand columns 25, are used for positioning the stand columns 25 pairwise and fixedly and transversely support the three-layer

rack partition plates

22, 24 and 26 and the rack top plate 21. The

rack partitions

22, 24, 26 are all horizontal, regular flat plates for holding the modules. Wherein a first rack partition 22 is installed on the upper portion of the bearing testing device 4, a second rack partition 24 is installed between the bearing testing device 4 and the loading system 5, and a third rack partition 26 is installed between the loading system 5 and the test bed base 6. The bench top plate 21 is a horizontal flat plate and is arranged at the upper end of the test bench. The upright columns 25 are uniformly distributed at four corners of the test bench and are vertically arranged. The plurality of gantry beams 23 are horizontally arranged and connected to the columns 25, and the upper end surfaces or the lower end surfaces of the plurality of gantry beams 23 are in contact with the

gantry partitions

22, 24, and 26 and the gantry top plate 21, respectively, and are fixed by bolts through bolt holes. The test bench 2 becomes the integrated basis of the tested transmission device 1, the bearing testing device 4, the loading system 5 and the test bench base 6.

As shown in fig. 2, the transmission system 1 includes an ac motor 11, a motor cover 12, a coupling 13, and a rotating shaft 14. The alternating current motor 11 is an alternating current motor capable of realizing rotation speed adjustment, the alternating current motor 11 is fixed on the upper surface of the rack top plate 21, and an output shaft of the alternating current motor 11 penetrates through the rack top plate 21. The motor cover 12 is installed on the upper portion of the test bed 2 and completely surrounds the alternating current motor 11, the upper end of the coupler 13 is connected with an output shaft of the alternating current motor 11 through a flat key, and the lower end of the coupler is coaxially connected with the upper end of the rotating shaft 14 through a flat key. The rotating shaft 14 passes through the first positioning bearing 3 and the second positioning bearing 7, and secondly, the rotating shaft 14 further passes through the

rack partition plates

22, 24 and 26, the rack top plate 21, the bearing testing device 4, the loading system 5 and the test bed base 6. First location bearing 3 and second location bearing 7 all adopt linear bearing, first location bearing 3 is fixed first rack baffle 22 upper surface, second location bearing 7 is fixed on rack base 6.

As shown in fig. 3, the bearing testing apparatus 4 includes a sealing upper gland 41, an upper end cap packing seal 42, an oil tank upper end cap 43, a thrust bearing fixing ring 44, a thrust bearing 45, a mirror plate 46, an oil tank 47, a lower end cap packing seal 48, an oil tank lower end cap 49, and a sealing lower gland 50, and the rotating shaft 14 sequentially passes through the sealing upper gland 41, the oil tank upper end cap 43, the thrust bearing 45, the mirror plate 46, the oil tank lower end cap 49, and the sealing lower gland 50; the upper end cover 43 of the oil tank seals an upper port of the oil tank 47, and the lower end cover 49 of the oil tank seals a lower port of the oil tank 47, specifically, the oil tank 47 is of a cylinder structure with flange type openings arranged up and down, the upper end cover 43 of the oil tank is connected with the upper end flange of the oil tank 47 through bolts and is fixedly connected with the first rack partition plate 22, and the lower end cover 49 of the oil tank is connected with the lower end flange of the oil tank 47 through bolts and is fixedly connected with the second rack partition plate 24; the upper sealing gland 41 and the lower sealing gland 50 are respectively in bolted connection with the upper oil tank end cover 43 and the lower oil tank end cover 49 to tightly press the upper end cover packing seal 42 and the lower end cover packing 48, the upper end cover packing seal 42 realizes the sealing between the upper oil tank end cover 43 and the rotating shaft 14, and the lower end cover packing seal 48 realizes the sealing between the lower oil tank end cover 49 and the rotating shaft 14; a thrust bearing fixing ring 44 is further fixedly arranged below the oil tank upper end cover 43, specifically, a flange ring is arranged outside the thrust bearing fixing ring 44, and the flange ring is fixedly clamped between an upper flange ring of the oil tank 47 and the oil tank upper end cover 43, so that the position of the thrust bearing fixing ring 44 is fixed, and the thrust bearing fixing ring and the test bench are kept static. The thrust bearing fixing ring 44 is connected with the thrust bearing 45 and limits the axial displacement of the thrust bearing 45 along the rotating shaft 14. The thrust bearing 45 and the mirror plate 46 are both located inside the oil tank 47, and the thrust bearing 45 and the mirror plate 46 are sleeved on the rotating shaft 14 in a mutually facing manner, the mirror plate 46 is a thicker circular ring plate, the inner circle of the mirror plate is provided with a key slot, the key slot is connected with the rotating shaft 14 and rotates synchronously, the mirror plate 46 is provided with a plurality of through holes, a pressure sensor and a displacement sensor can be installed, and the mirror plate 46 is arranged at the lower part of the thrust bearing 45.

As shown in fig. 3, the bearing testing apparatus 4 further has a measuring system including a temperature sensor 31, a pressure sensor 32, a displacement sensor 33, and a conductive slip ring 34, wherein the temperature sensor 31 is installed in a back hole of the thrust bearing 45, a plurality of the temperature sensors 31 are arranged on the back of the pad, the depth of the hole on the back of the pad does not extend completely through the thickness of the thrust bearing 45, and the bottom of the hole is located 2mm away from the pad surface (i.e. the surface adjacent to the mirror plate 46). The mirror plate 46 is provided with through circular holes at equal intervals in the radial direction, and the pressure sensor 32 and the displacement sensor 33 are mounted in the circular holes of the mirror plate 46. The conductive slip ring 34 is a via hole type conductive slip ring, and is composed of a rotor 34A and a stator 34B, the rotor 34A is fixed with the rotating shaft 14 and rotates synchronously, the stator 34B is fixed with the oil tank 47, wires of the temperature sensor 31, the pressure sensor 32 and the displacement sensor 33 are connected with the rotor 34A, and the stator 34B is connected with an external data collector, so that dynamic data collection during rotation of the mirror plate 46 can be realized.

As shown in fig. 4, the loading system 5 includes a thrust collar fixing ring 51, an oil outlet pipe 52, a thrust collar 53, a hydrostatic bearing 54, a loading cylinder 55, an oil inlet pipe 56, a loading oil tank 57, a cylinder connector 58 and a sealing sleeve 59; the upper end and the lower end of the loading oil tank 57 are sealed by partition plates, the upper part of the thrust collar 53 is fixed by the thrust collar fixing ring 51 to limit the axial displacement of the thrust collar, and the thrust collar 53 is connected with the rotating shaft 14 through a flat key and synchronously rotates. The loading oil cylinders 55 are arranged on a bottom partition of a loading oil tank 57, the output ends of the loading oil cylinders 55 are connected with the hydrostatic bearings 54, the hydrostatic bearings 54 are positioned at the lower parts of the thrust heads 53, high-pressure lubricating oil is injected into the hydrostatic bearings 54 to jack the thrust heads 53, and then the hydrostatic bearings 54 and the thrust heads 53 are prevented from contacting with each other, namely, gaps are formed between the adjacent surfaces of the thrust heads 53 and the hydrostatic bearings 54 by means of the pressure of the lubricating oil. The lubricating oil with a certain liquid level is arranged in the loading oil tank 57, the liquid level of the lubricating oil is higher than the hydrostatic bearing 54 and lower than the upper surface 53 of the thrust head, the lubricating oil is injected from an external hydraulic station through an oil inlet 56, and the high-temperature lubricating oil is sucked out through the oil outlet pipe 52. The sealing sleeve 59 is sleeved outside the rotating shaft 14, the lower end of the sealing sleeve is in contact with the bottom of the oil tank, the upper end of the sealing sleeve is extended between the thrust head 53 and the rotating shaft 14, and the height of the sealing sleeve 59 is higher than the liquid level of the lubricating oil.

The tilting pad thrust bearing test device is used for testing the bearing, pressure parameters and rotating speed can be set according to the actual working condition of the thrust bearing and the similar theory, the maximum torque parameter allowed by the thrust bearing in the actual working condition is set, and the running time of the thrust bearing reaching the set maximum torque for the first time is tested. The invention realizes the following functions: controlling the operation of the whole equipment by using a computer, and controlling the adjustment of external loading force and the rotation speed of the motor by using the computer; the oil film thickness, the oil film pressure and the bearing temperature can be detected; data are collected, recorded and stored in real time; the designed test bed can be used for bearing tests with different sizes; and mechanical systems such as a loading system, a test bed component, a rotary transmission system and the like are designed in an integrated manner, so that the assembly and the maintenance are convenient.

While the embodiments of the invention have been described with reference to the accompanying drawings, it is not limited to the scope of the invention, and it will be understood by those skilled in the art that various changes and modifications in equivalent structure and equivalent flow of the invention may be made without departing from the spirit and scope of the invention, and it is within the scope of the invention that the invention may be applied to other related fields directly or indirectly.

Claims

1. A thrust bearing performance test device based on a similar theory is characterized by comprising a transmission system, a bearing test device and a loading system, wherein the transmission system, the bearing test device and the loading system are sequentially arranged from top to bottom by taking a test bench as a basic frame;

the transmission system is connected with the rotating shaft and provides rotating speed and torque required by a test for the rotating shaft, and the rotating shaft downwards penetrates through the bearing testing device and the loading system; the loading system provides an external loading force;

the bearing testing device comprises a thrust bearing, a thrust bearing fixing ring and a mirror plate, wherein the thrust bearing and the mirror plate are sleeved on the rotating shaft in a mutually facing manner, the mirror plate is a thick circular ring plate and is relatively fixedly connected with the rotating shaft and synchronously rotates, and a plurality of through holes penetrating through the thickness of the mirror plate are formed in the mirror plate; the thrust bearing is positioned above the mirror plate, and the thrust bearing fixing ring is positioned above the thrust bearing and connected with the thrust bearing; the thrust bearing fixing ring is static relative to the test bed;

the bearing testing device further comprises a measuring system, wherein the measuring system comprises a temperature sensor, a pressure sensor, a displacement sensor and a conductive slip ring, the pressure sensor and the displacement sensor are arranged in the through hole of the mirror plate, the temperature sensor is arranged in a bearing bush back hole of the thrust bearing, the bearing bush back hole is an opening with the depth not completely penetrating through the thickness direction of the thrust bearing, and the bottom of the opening is 2mm away from the bush surface of the thrust bearing; the conductive slip ring is a via hole type conductive slip ring and comprises a rotor and a stator, the rotor and the rotating shaft are fixed and synchronously rotate, the stator is static and fixed relative to the test bed, the temperature sensor, the pressure sensor and the displacement sensor are connected with the rotor through leads, and the stator is connected with an external data collector.

2. The test device according to claim 1, further characterized in that the loading system comprises a thrust collar fixing ring, an oil outlet pipe, a thrust collar, a hydrostatic bearing, a loading cylinder, an oil inlet pipe, a loading oil tank, a cylinder connector and a sealing sleeve; the upper end and the lower end of the loading oil tank are sealed by partition plates, and the upper part of the thrust collar is fixed by the thrust collar fixing ring to limit the axial displacement of the thrust collar fixing ring; the thrust head is fixedly connected with the rotating shaft and synchronously rotates; the loading oil cylinders are arranged on a bottom partition plate of the loading oil tank, the output ends of the loading oil cylinders are connected with the hydrostatic bearings, the hydrostatic bearings are positioned at the lower parts of the thrust heads, and the thrust heads can be jacked up by means of the injection pressure of high-pressure lubricating oil, so that the hydrostatic bearings and the thrust heads are prevented from being contacted with each other; lubricating oil with a certain liquid level is arranged in the loading oil tank, the liquid level of the lubricating oil is higher than the hydrostatic bearing and lower than the upper surface of the thrust head, the lubricating oil is injected from an external hydraulic station through an oil inlet, and high-temperature lubricating oil is sucked out through the oil outlet pipe; the sealing sleeve is sleeved outside the rotating shaft, the lower end of the sealing sleeve is in contact with the bottom of the oil tank, the upper end of the sealing sleeve extends into a position between the thrust head and the rotating shaft, and the height of the sealing sleeve is higher than the liquid level of lubricating oil.

3. The testing device according to claim 1 or 2, further characterized in that the bearing testing device further comprises a seal upper gland, an upper end cover packing seal, an oil tank upper end cover, an oil tank, a lower end cover packing seal, an oil tank lower end cover, a seal lower gland; the upper end cover of the oil tank seals the upper port of the oil tank, and the lower end cover of the oil tank seals the lower port of the oil tank; the rotating shaft penetrates through an upper end cover of the oil tank and a lower end cover of the oil tank, the upper end cover is sealed by filler to realize the sealing between the upper end cover of the oil tank and the rotating shaft, and the lower end cover is sealed by filler to realize the sealing between the lower end cover of the oil tank and the rotating shaft; the upper sealing gland is fixedly connected with the upper end cover of the oil tank to compress the upper end cover packing seal, and the lower sealing gland is fixedly connected with the lower end cover of the oil tank to compress the lower end cover packing seal; the thrust bearing, the thrust bearing fixing ring, the mirror plate and the measuring system are all arranged in the oil tank, and the thrust bearing fixing ring is fixedly connected relative to the oil tank.

4. The testing device of claim 3, wherein the oil tank is of a cylinder structure with flange-type openings arranged at the upper part and the lower part, an upper end cover of the oil tank is connected with an upper end flange of the oil tank through bolts, and a lower end cover of the oil tank is connected with a lower end flange of the oil tank through bolts; the outer side of the bearing fixing ring is provided with a flange ring which is fixedly clamped between an upper flange ring of the oil tank and an upper end cover of the oil tank, so that the position of the bearing fixing ring is fixed.

5. The testing device of claim 1, further characterized in that the test rig comprises three layers of rig partitions, a rig top plate, a plurality of rig beams, and four columns; the four stand columns 25 support the three-layer rack partition plates and the rack top plate into a laminated structure, and the rack cross beams are connected among the four stand columns and used for positioning every two stand columns and fixing and transversely supporting the three-layer rack partition plates and the rack top plate; the transmission system is installed on the bench top plate, the bearing testing device is installed between the first bench partition plate and the second bench partition plate, and the loading system is installed between the second bench partition plate and the third bench partition plate.

6. The test device according to claim 5, further characterized by further comprising a test bed base, wherein a first positioning bearing is arranged between the first bed partition plate and the bed top plate, a second positioning bearing is arranged on the test bed base, and the upper end and the lower end of the rotating shaft are positioned and installed through the first positioning bearing and the second positioning bearing respectively.

7. The test device of claim 6, further characterized in that the transmission system comprises an alternating current motor, a motor cover and a coupler, the motor cover is mounted on the upper portion of the test bench and completely surrounds the alternating current motor, and an output shaft of the alternating current motor is in transmission connection with the rotating shaft through the coupler.

8. The test device according to claim 1, wherein a plurality of bearing bush back holes are formed, and each bearing bush back hole is provided with a temperature sensor; the through holes of the mirror plate are arranged at equal intervals along the radius direction of the mirror plate.