Bearing retainer displacement test equipment

Abstract

The invention relates to the technical field of bearing retainer testing, in particular to bearing retainer displacement testing equipment. In order to solve the problem that the test result is inaccurate due to the fact that the mass and the gravity center position of the retainer are easily changed by a method for testing the mass center motion trail of the retainer through a displacement method in the prior art, the invention provides novel bearing retainer displacement test equipment. Comprising a driving motor, a main shaft, an accompanying test bearing unit, a loading bearing unit, a test bearing unit, a square frame type test bed base, a test unit and a loading unit. According to the invention, the laser sensing head is arranged outside, a non-contact measurement mode is adopted, and the displacement of the retainer is effectively tested on the premise that the quality, the structure and the operation characteristics of the bearing retainer are not changed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing cage testing, in particular to a bearing cage displacement testing device. BACKGROUND

[0002] In recent years, with the increase of railway motor vehicle service mileage and the extension of route coverage, the running environment of the train is more complex and variable, and the operation reliability of the traction motor of the rail transit vehicle has also been paid more attention and researched. As the core component in the traction motor, the rolling bearing plays the role of transmission, support, friction reduction, etc., and the cage is the key component to ensure the stable operation of the rolling bearing. The bearing cage has important functions such as controlling the rolling elements in the bearing to run at equal intervals, preventing the rolling elements from contacting and rubbing each other, reducing the load concentration of the bearing, and guiding the operation of the rolling elements in the no-load area. The bearing cage is a floating operation part without support, and the bearing cage of the traction motor mainly bears the interaction force from the guide ring and the rolling elements, which is prone to unstable phenomenon during movement, thereby causing the cage to have a large collision impact and vibration, and generating crack, fracture and other failure modes. Therefore, it is necessary to establish a bearing cage mass center trajectory testing test bench under different speed and load conditions and the corresponding testing method.

[0003] The prior art adopts displacement method testing, i.e. before testing, two wireless displacement sensors are fixed on the end face of the bearing cage where no interference occurs with the rollers, and the space of the movement area of the cage is reserved to ensure that the connecting lines of the two installed sensors and the mass center of the cage are perpendicular to each other, so that the sensors can record the displacement distance of the cage in two perpendicular directions in the plane. By real-time monitoring of the displacement in different directions, the displacement components of the mass center of the cage at each time are obtained, and finally the two-direction displacement data are synthesized to obtain the motion trajectory of the mass center of the cage. However, this method must fix the displacement sensors on the end face of the cage before testing, the mass and the position of the gravity center of the cage are changed, and the change of the mass distribution of the cage leads to a certain difference between the movement condition and the actual working condition, resulting in inaccurate test results. In addition, since no lubrication system is designed, for the bearing using lubricating oil as the lubricating medium, the lubricating oil cannot be supplemented in time, which easily leads to poor lubrication of the bearing, which is inconsistent with the actual situation, and the reliability of the test results is low. SUMMARY

[0004] The present application is to solve the problem that the prior art method of testing the motion trajectory of the mass center of the cage by displacement method is prone to change the mass and the position of the gravity center of the cage, thereby resulting in inaccurate test results, and therefore provides a new bearing cage displacement testing device.

[0005] The present application is implemented by adopting the following technical solutions: A bearing retainer displacement amount testing device, comprising a driving motor, a main shaft, a test bearing unit, a loading bearing unit, a test bearing unit, a square frame type test bench base, a testing unit, a loading unit; The rotating shaft of the driving motor is coaxially fixed with the main shaft, the test bearing unit and the test bearing unit are respectively installed at the two ends of the main shaft, and the test bearing unit is arranged close to the driving motor, the loading bearing unit is installed on the main shaft part between the test bearing unit and the test bearing unit, and the upper end and the lower end of the outer ring of the test bearing unit and the test bearing unit are fixed with the inner top surface and the inner bottom surface of the test bench base through the support connecting rods respectively. The testing unit comprises a testing platform fixed to the inner bottom surface of the test bench base, the testing platform is located on the side of the test bearing unit away from the driving motor, two laser sensing heads are installed on the testing platform, the laser scanning range of the two laser sensing heads covers the gap between the retainer and the outer ring, and the two laser scanning lines emitted by the two laser sensing heads are perpendicular to each other, and the vertical intersection point coincides with the bearing outer ring center point of the test bearing unit. The loading unit comprises a hydraulic mechanism fixed to the outer top surface of the test bench base, the telescopic loading rod of the hydraulic mechanism slides up and down through the top surface of the test bench base and abuts against the outer ring of the loading bearing unit, and the hydraulic mechanism acts to transmit the load to the loading bearing unit through the telescopic loading rod.

[0006] During testing, the driving motor is started, the rotating shaft of the driving motor rotates, the main shaft rotates, and the bearing inner ring of the test bearing unit rotates, so as to apply a rotating speed to the test bearing unit; the hydraulic mechanism is used to apply a radial load to the loading bearing unit, and then the load is transmitted to the test bearing through the main shaft, so that the test bearing bears the load applied by the outside; after the load and the rotating speed applied by the outside reach the expected working state, the laser sensing head is started, a line laser is emitted to cover and scan the gap between the retainer and the test bearing outer ring (as known to those skilled in the art, the laser points of the laser line composed of the two laser sensing heads are uniformly distributed, the interval of the laser points is known, and the gap value between the retainer profile point and the inner ring profile point can be obtained by multiplying the number of laser points by the interval of the laser points), the change of the gap is monitored, the displacement of the retainer in two perpendicular directions at any time is directly obtained, and the data accuracy is high.

[0007] Further, the test bearing unit and the loading bearing unit are both bearing units with grease storage function, which can better simulate the real working condition and improve the testing accuracy.

[0008] Further, the test bearing unit comprises a test bearing, an oil inlet pipe, an oil return pipe, a test bearing sleeve, an outer test end cover and an inner test end cover respectively arranged at both ends of an outer ring of the test bearing, a grease cavity arranged between the inner test end cover and a left end of the test bearing, two laser holes on the outer test end cover adapted to a laser sensing head, a test inner spacer and a test outer spacer respectively arranged at both ends of an inner ring of the test bearing, an outer labyrinth seal structure arranged between the outer test end cover and the test outer spacer, an inner labyrinth seal structure arranged between the inner test end cover and the test inner spacer, the test bearing sleeve fixed to the inner top surface and the outer top surface of the test bed base through a support connecting rod, the oil inlet pipe sequentially sealed through an oil inlet hole at the upper end of the outer test end cover, the upper end of the test bearing sleeve and the upper end of the inner test end cover, and then enters the upper part of the grease cavity, the lower end of the test bearing sleeve is provided with an axially arranged recovery hole, the right end of the recovery hole is communicated with an oil return hole at the lower end of the outer test end cover, and the oil return hole is communicated with the oil return pipe. The structure of the test bearing unit is specific and standardized, and the test bearing unit has a lubricating function. The lubricating principle is as follows: during use, oil is transported into the upper part of the grease cavity through the oil inlet pipe. Due to the action of gravity, the lubricating oil flows to the lower part of the grease cavity, lubricates the test bearing through the gap in the test bearing, and then flows out through the oil return pipe, so as to realize the lubrication of the test bearing.

[0009] Further, the loading bearing unit is arranged close to the test bearing unit, which facilitates better load transmission.

[0010] Further, the test bearing unit comprises a test bearing, an oil inlet pipe, an oil return pipe, a test bearing sleeve, an outer test end cover and an inner test end cover respectively arranged at both ends of an outer ring of the test bearing, a grease cavity arranged between the inner test end cover and a left end of the test bearing, two laser holes on the outer test end cover adapted to a laser sensing head, a test inner spacer and a test outer spacer respectively arranged at both ends of an inner ring of the test bearing, an outer labyrinth seal structure arranged between the outer test end cover and the test outer spacer, an inner labyrinth seal structure arranged between the inner test end cover and the test inner spacer, the test bearing sleeve fixed to the inner top surface and the outer top surface of the test bed base through a support connecting rod, the oil inlet pipe sequentially sealed through an oil inlet hole at the upper end of the outer test end cover, the upper end of the test bearing sleeve and the upper end of the inner test end cover, and then enters the upper part of the grease cavity, the lower end of the test bearing sleeve is provided with an axially arranged recovery hole, the right end of the recovery hole is communicated with an oil return hole at the lower end of the outer test end cover, and the oil return hole is communicated with the oil return pipe. The structure of the test bearing unit is specific and standardized, and the test bearing unit has a lubricating function. The lubricating principle is as follows: during use, oil is transported into the upper part of the grease cavity through the oil inlet pipe. Due to the action of gravity, the lubricating oil flows to the lower part of the grease cavity, lubricates the test bearing through the gap in the test bearing, and then flows out through the oil return pipe, so as to realize the lubrication of the test bearing.

[0011] Further, the loading bearing unit comprises a loading bearing, the loading bearing is installed in a loading sleeve, and the loading bearing is further provided with a loading inner spacer, a loading outer spacer, a loading end cover and a loading seal ring structure, and the loading inner spacer and the test inner spacer are integrated, thereby improving the loading stability. The structure of the loading bearing unit is specific and standardized, thereby improving the stability of the equipment.

[0012] Further, the top surface of the loading sleeve is fixed with a guide connecting block, and the telescopic loading rod is slidingly connected to the guide connecting block, thereby facilitating more stable loading and improving the test effect.

[0013] Further, the motor shaft and the main shaft are connected through a shaft coupling, which is used to compensate for the error caused by the manufacturing and installation or deformation of the motor shaft and the main shaft, and ensure the stability of the main shaft during rotation.

[0014] Further, the device further comprises a control system, which is used to adjust the rotating speed of the driving motor and the loading force of the hydraulic mechanism, so as to control the external excitation load received by the test bearing.

[0015] Further, the two laser holes are rectangular holes, so that the laser is not disturbed and can normally scan the gap between the retainer and the outer ring.

[0016] The beneficial effects of the present application are as follows: 1) The radial loading device is designed to provide a reliable external excitation load loading method, which can accurately control the bearing load condition and ensure that the bearing load condition is consistent with the actual working load, thereby improving the authenticity of the test results.

[0017] 2) The present application provides a sufficient lubrication environment for bearing movement, and designs a circulating oil supply lubrication device in the test platform, which realizes the flow lubrication of the lubricating oil in the bearing, considers the flow path of the lubricating oil in the bearing during operation and the influence of the related lubricating oil film on the movement of each part of the bearing, and the lubrication condition of the bearing retainer is good, the bearing works in the actual running lubrication state, the test environment is more close to the actual running environment, and the authenticity of the test results is improved.

[0018] 3) The present application provides a test method for the mass center trajectory of the retainer without changing the motion characteristics of the bearing, which uses a non-contact measurement method to effectively test the mass center trajectory of the retainer without changing the mass, structure and operating characteristics of the retainer.

[0019] 4) The present application has high test precision. The test method does not need to mark the retainer, reduces the error of manual operation in the marking setting, and improves the test precision; in the test, the laser sensing head is easy to install, and the laser sensor has high sampling frequency and precision, which can cover and scan the gap between the retainer and the outer ring of the test bearing by emitting a line laser, monitor the gap change, directly obtain the displacement of the retainer in two perpendicular directions at any time, and the data precision is higher.

[0020] 5) The data obtained after the test can be accurately obtained without additional data processing analysis. The gap length of the guide ring and the cage at the time of balance is taken as the reference value, the displacement of the cage in the radial direction is obtained by calculating the distance between the actual profile line and the theoretical profile line, and then the coordinate of the center of mass of the cage at this time is determined (how to determine the center of mass coordinate through displacement is obtained by conventional means for those skilled in the art). In turn, the new cage center of mass coordinates are determined at the next time, until all the center of mass coordinates in the measurement time are determined. The data in the two test sensors are taken as the Y / Z axis variables in the plane coordinate system, and the actual test cage center of mass trajectory image is obtained by direct fitting without further processing.

[0021] 6) The test equipment described in the present application has simple structure and low manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0024] Figure 1 The overall structure of the test equipment described in the present application is shown in the figure. Figure 2 The side view of the test bearing and the outer test end cover is shown in the figure. Figure 3 The position relationship between the two laser sensing heads and the test bearing is shown in the figure. Figure 4 The displacement test principle of the test bearing cage is shown in the figure. Figure 5 The principle of the laser sensing head obtaining the gap between the cage and the outer ring of the test bearing is shown in the figure.

[0025] In the figure: 1-driving motor, 2-main shaft, 3-test bench base, 4-support connecting rod, 5-test platform, 6-laser sensing head, 7-hydraulic mechanism, 8-telescopic loading rod, 9-coupling, 10-test bearing, 11-oil inlet pipe, 12-oil return pipe, 13-test bushing, 14-outer test end cover, 15-inner test end cover, 16-grease cavity, 17-laser hole, 18-test inner spacer sleeve, 19-test outer spacer sleeve, 20-oil inlet hole, 21-oil return hole, 22-accompanying test bearing, 23-accompanying test bushing, 24-accompanying test end cover, 25-accompanying test inner spacer sleeve, 26-accompanying test outer spacer sleeve, 27-loading bearing, 28-loading bushing, 29-guiding connecting block, 30-loading outer spacer sleeve, 31-loading end cover, 32-loading sealing ring. DETAILED DESCRIPTION

[0026] In order to enable a more clearly understanding of the above-mentioned objects, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0027] In the description, it should be noted that the terms “first”, “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance. It should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connecting” and “connection” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0028] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the examples in the description are only some of the embodiments of the present application, not all the embodiments.

[0029] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0030] As Figures 1 to 4 shown, a bearing retainer displacement amount test equipment, comprising a driving motor 1, a main shaft 2, an accompanying test bearing unit, a loading bearing unit, a test bearing unit, a square frame type test bench base 3, a test unit, a loading unit; The rotating shaft of the driving motor 1 is coaxially fixed with the main shaft 2, the trial bearing unit and the test bearing unit are respectively installed at the two ends of the main shaft 2, and the trial bearing unit is arranged close to the driving motor 1, the loading bearing unit is installed on the main shaft 2 between the trial bearing unit and the test bearing unit, and the upper end and the lower end of the outer ring of the trial bearing unit and the outer ring of the test bearing unit are respectively fixed with the inner top surface and the inner bottom surface of the test bench base 3 through the support connecting rods 4; The test unit includes a test platform 5 fixed to the inner bottom surface of the test bench base 3, the test platform 5 is located on the side of the test bearing unit away from the driving motor 1, two laser sensing heads 6 are installed on the test platform 5, the laser scanning range of the two laser sensing heads 6 covers the gap between the retainer and the outer ring, and the two laser scanning lines emitted by the two laser sensing heads 6 are perpendicular to each other, and the vertical intersection point coincides with the center point of the bearing outer ring of the test bearing unit. The loading unit includes a hydraulic mechanism 7 fixed to the outer top surface of the test bench base 3, the telescopic loading rod 8 of the hydraulic mechanism 7 slides up and down through the top surface of the test bench base 3 and abuts against the outer ring of the loading bearing unit, and the hydraulic mechanism 7 acts to transmit the load to the loading bearing unit through the telescopic loading rod 8.

[0031] During testing, the driving motor 1 is started, the rotating shaft of the driving motor 1 rotates, drives the main shaft 2 to rotate, thereby drives the bearing inner ring of the test bearing unit to rotate, so as to apply a rotating speed to the test bearing unit; the hydraulic mechanism 7 is used to apply a radial load to the loading bearing unit, and then the load is transmitted to the test bearing 10 through the main shaft 2, so that the test bearing 10 bears the load applied by the outside; after the load and the rotating speed applied by the outside reach the expected working state, the laser sensing head 6 is started, a line laser is emitted to cover and scan the gap between the retainer and the outer ring of the test bearing 10 (as known to those skilled in the art, as shown in the figure, the laser points of the laser line composed of the two laser sensing heads are uniformly distributed, the interval of the laser points is known, and the gap value between the retainer and the test bearing outer ring can be obtained by calculating the number of laser points between the retainer profile points and the inner ring profile points and multiplying the interval of the laser points), the change of the gap is monitored, and the displacement of the retainer in two perpendicular directions at any time is directly obtained, and the data accuracy is high. Figure 5

[0032] Specifically, the trial bearing unit and the loading bearing unit are bearing units with grease storage function.

[0033] ​In specific implementation, the test bearing unit comprises a test bearing 10, an oil inlet pipe 11 and an oil return pipe 12, the test bearing 10 is sleeved with a test bushing 13, outer test end covers 14 and inner test end covers 15 are respectively arranged at both ends of the outer ring of the test bearing 10, an oil cavity 16 is arranged between the inner test end cover 15 and the left end of the test bearing 10, two laser holes 17 adapted to the laser sensing head 6 are arranged on the outer test end cover 14, test inner spacer sleeves 18 and test outer spacer sleeves 19 are respectively arranged at both ends of the inner ring of the test bearing 10, an outer labyrinth seal structure is arranged between the outer test end cover 14 and the test outer spacer sleeve 19, an inner labyrinth seal structure is arranged between the inner test end cover 15 and the test inner spacer sleeve 18, the test bushing 13 is fixed to the inner top surface and the outer top surface of the test bed base 3 through the support connecting rod 4, the oil inlet pipe 11 is sequentially sealed through an oil inlet hole 20 at the upper end of the outer test end cover 14, the upper end of the test bushing 13 and the upper end of the inner test end cover 15, and then enters the upper part of the oil cavity 16, the lower end of the test bushing 13 is provided with an axially arranged recovery hole, the right end of the recovery hole is communicated with an oil return hole 21 at the lower end of the outer test end cover 14, and the oil return hole 21 is communicated with the oil return pipe 12. The structure of the test bearing unit is specific and standardized, and the test bearing unit has a lubricating function, and the lubricating principle is as follows: in use, oil is delivered to the upper part of the oil cavity 16 through the oil inlet pipe 11, due to the action of gravity, the lubricating oil flows to the lower part of the oil cavity 16, and the test bearing 10 is lubricated through the gap in the test bearing 10, when the lubricating oil in the lower part of the oil cavity 16 accumulates to a certain amount, it flows into the recovery hole on the test bushing 13, and finally flows out through the oil return pipe 12, so as to realize the lubrication of the test bearing 10.

[0034] In specific implementation, the loading bearing unit is arranged close to the test bearing unit, so as to better transmit the load.

[0035] In specific implementation, the test bearing unit comprises a test bearing 10, an oil inlet pipe 11 and an oil return pipe 12, the test bearing 10 is sleeved with a test bushing 13, outer test end covers 14 and inner test end covers 15 are respectively arranged at both ends of the outer ring of the test bearing 10, an oil cavity 16 is arranged between the inner test end cover 15 and the left end of the test bearing 10, two laser holes 17 adapted to the laser sensing head 6 are arranged on the outer test end cover 14, test inner spacer sleeves 18 and test outer spacer sleeves 19 are respectively arranged at both ends of the inner ring of the test bearing 10, an outer labyrinth seal structure is arranged between the outer test end cover 14 and the test outer spacer sleeve 19, an inner labyrinth seal structure is arranged between the inner test end cover 15 and the test inner spacer sleeve 18, the test bushing 13 is fixed to the inner top surface and the outer top surface of the test bed base 3 through the support connecting rod 4, the oil inlet pipe 11 is sequentially sealed through an oil inlet hole 20 at the upper end of the outer test end cover 14, the upper end of the test bushing 13 and the upper end of the inner test end cover 15, and then enters the upper part of the oil cavity 16, the lower end of the test bushing 13 is provided with an axially arranged recovery hole, the right end of the recovery hole is communicated with an oil return hole 21 at the lower end of the outer test end cover 14, and the oil return hole 21 is communicated with the oil return pipe 12. The structure of the test bearing unit is specific and standardized, and the test bearing unit has a lubricating function, and the lubricating principle is as follows: in use, oil is delivered to the upper part of the oil cavity 16 through the oil inlet pipe 11, due to the action of gravity, the lubricating oil flows to the lower part of the oil cavity 16, and the test bearing 10 is lubricated through the gap in the test bearing 10, when the lubricating oil in the lower part of the oil cavity 16 accumulates to a certain amount, it flows into the recovery hole on the test bushing 13, and finally flows out through the oil return pipe 12, so as to realize the lubrication of the test bearing 10.

[0036] In specific implementation, the loading bearing unit comprises a loading bearing 27, the loading bearing 27 is installed in a loading bushing 28, and the loading bearing 27 is further provided with a loading inner spacer sleeve, a loading outer spacer sleeve 30, a loading end cover 31 and a loading sealing ring 32 structure. The structure of the loading bearing unit is specific and standardized, and the stability of the equipment is improved.

[0037] In specific implementation, the top surface of the loading bushing 28 is fixed with a guide connecting block 29, and the telescopic loading rod 8 is slidingly connected to the guide connecting block 29, so as to be more stable during loading and improve the test effect.

[0038] In the embodiment, the motor rotating shaft is connected with the main shaft 2 through the coupling 9, which is used to compensate the error caused by the manufacturing and installation or deformation of the motor rotating shaft and the main shaft 2, and ensure the stability of the main shaft 2 during rotation.

[0039] In the embodiment, the device further comprises a control system, which is used to adjust the rotating speed of the driving motor 1 and the loading force of the hydraulic mechanism 7, so as to control the external excitation load received by the test bearing 10.

[0040] In the embodiment, the two laser holes 17 are rectangular holes, which are specific and standardized.

[0041] The above description is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Although the foregoing embodiments are described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should be covered in the protection scope of the claims.

Claims

1. A bearing retainer displacement test device, characterized in that: It includes a driving motor (1), a main shaft (2), a test bearing unit, a loading bearing unit, a test bearing unit, a square frame test bench base (3), a test unit, and a loading unit; The rotating shaft of the driving motor (1) is coaxially fixed with the main shaft (2), the accompanying test bearing unit and the test bearing unit are respectively installed at the two ends of the main shaft (2), and the accompanying test bearing unit is arranged close to the driving motor (1), and the loading bearing unit is installed on the main shaft (2) between the accompanying test bearing unit and the test bearing unit. The upper end and the lower end of the outer ring of the accompanying test bearing unit and the outer ring of the test bearing unit are respectively fixed to the inner top surface and the inner bottom surface of the test bench base (3) through the supporting connecting rod (4); The test unit includes a test platform (5) fixed to the inner bottom surface of the test bench base (3), the test platform (5) is located on the side of the test bearing unit away from the drive motor (1), and two laser sensor heads (6) are installed on the test platform (5), the laser scanning range of the two laser sensor heads (6) covers the gap between the retaining frame and the outer ring, and the two laser scanning lines emitted by the two laser sensor heads (6) are perpendicular to each other, and the vertical intersection point thereof coincides with the center point of the bearing outer ring of the test bearing unit; The loading unit includes a hydraulic mechanism (7) fixed to the outer top surface of the test bench base (3); a telescopic loading rod (8) of the hydraulic mechanism (7) slides up and down through the top surface of the test bench base (3) and abuts against the outer ring of the loading bearing unit; the hydraulic mechanism (7) is actuated to transfer the load to the loading bearing unit through the telescopic loading rod (8).

2. A bearing retainer displacement testing device according to claim 1, characterized in that: Both the test bearing unit and the loaded bearing unit are bearing units with grease storage function.

3. A bearing retainer displacement testing device according to claim 2, characterized in that: The test bearing unit comprises a test bearing (10), an oil inlet pipe (11), and an oil return pipe (12). The test bearing (10) is provided with a test bushing (13) on its outer sleeve. The outer ring of the test bearing (10) is provided with an outer test end cover (14) and an inner test end cover (15) at both ends. A grease cavity (16) is provided between the inner test end cover (15) and the left end of the test bearing (10). Two laser holes (17) adapted to the laser sensor head (6) are provided on the outer test end cover (14). The inner ring of the test bearing (10) is provided with a test inner spacer (18) and a test outer spacer (19) at both ends. An outer spacer is provided between the outer test end cover (14) and the test outer spacer (19). A labyrinth seal structure is provided between the inner test end cover (15) and the test inner spacer (18). The test bushing (13) is fixed to the inner top surface and the outer top surface of the test bench base (3) through the supporting connecting rod (4). The oil inlet pipe (11) is sealed and passes through the oil inlet hole (20) at the upper end of the outer test end cover (14), the upper end of the test bushing (13), the upper end of the inner test end cover (15), and then enters the upper part of the grease cavity (16). The lower end of the test bushing (13) is provided with an axially arranged recovery hole. The right end of the recovery oil hole is connected to the oil return hole (21) at the lower end of the outer test end cover (14), and the oil return hole (21) is connected to the oil return pipe (12).

4. A bearing retainer displacement testing device according to claim 3, characterized in that: The loaded bearing unit is arranged close to the test bearing unit.

5. The bearing retainer displacement testing device according to claim 4, characterized in that: The test bearing unit comprises a test bearing (22), the test bearing (22) having a test bushing (23) on its outer cover, and the test bearing (22) is further provided with a test end cover (24), a test inner spacer (25), a test outer spacer (26), an inner sealing ring and an outer sealing ring structure.

6. The bearing retainer displacement testing device according to claim 5, characterized in that: The loading bearing unit includes a loading bearing (27), which is installed in a loading bushing (28). The loading bearing (27) is also equipped with a loading inner spacer, a loading outer spacer (30), a loading end cover (31), and a loading sealing ring (32) structure.

7. The bearing retainer displacement test device according to claim 6, characterized in that: A guide connecting block (29) is fixed to the top surface of the loading bushing (28), and the telescopic loading rod (8) is connected to the guide connecting block (29) by sliding up and down.

8. The bearing retainer displacement testing device according to claim 7, characterized in that: The motor shaft is connected to the main shaft (2) via a coupling (9).

9. The bearing retainer displacement testing device according to claim 8, characterized in that: The device also includes a control system for adjusting the rotation speed of the drive motor (1) and the loading force of the hydraulic mechanism (7), thereby controlling the external excitation load received by the test bearing (10).

10. The bearing retainer displacement testing device according to claim 9, characterized in that: The two laser holes (17) are rectangular holes.

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