Rolling bearing dynamic performance testing machine simulating high-frequency excitation and shafting excitation

Abstract

The invention relates to a rolling bearing dynamic performance testing machine for simulating high-frequency excitation and shafting excitation. The rolling bearing dynamic performance testing machine comprises a workbench, a driving device, a testing machine main body, an external measurement and control device, a radial loading device, an axial loading device and a radial vibration device, the testing machine main body comprises a supporting seat, and the testing shaft is rotatably supported on two bearing seats on the supporting seat through an accompanying bearing; a test bearing is arranged on the periphery of the test shaft, a bearing lantern ring is arranged on the periphery of the test bearing, a plurality of mounting grooves are formed in the inner wall of the bearing lantern ring at intervals in the circumferential direction, the piezoelectric vibration pieces are fixedly assembled in the mounting grooves through mounting bolts, and the mounting bolts are further sleeved with pre-tightening springs which are used for enabling the piezoelectric vibration pieces to press the test bearing; the piezoelectric vibrating reed is connected with an external electric controller through a wire harness penetrating through the wire harness hole in the mounting groove, and the piezoelectric vibrating reed generates high-frequency vibration displacement with different frequencies by adjusting the external electric controller. According to the invention, the most real and complex high-frequency vibration working condition of the bearing during working can be simulated.

Description

Technical Field

[0001] The present invention relates to a rolling bearing dynamic performance testing machine for simulating high-frequency excitation and shaft system excitation, belonging to the technical field of bearing performance testing. The testing machine is intended to comprehensively evaluate the dynamic performance, durability and reliability of a rolling bearing by simulating the real high-frequency vibration excitation environment encountered by the rolling bearing in actual operation. Background Art

[0002] As the core component of rotating machinery, the performance of rolling bearings directly affects the operating stability and life of the entire mechanical system. In modern industrial applications, rolling bearings often need to work in a high-frequency vibration environment. For example, in the aerospace field, the engines and transmission systems of aircraft, rockets and other aircraft will generate high-frequency vibrations during operation. These vibrations put forward higher requirements on the performance, life and safety of components such as bearings. Therefore, accurate simulation of these vibration excitations is crucial for evaluating the dynamic performance of rolling bearings. Traditional rolling bearing performance test methods are often limited to tests under static or simplified dynamic conditions, and cannot fully reflect the actual performance of bearings in complex high-frequency vibration environments. Although some advanced test equipment has begun to try to simulate high-frequency vibration environments in recent years, most equipment still has the following shortcomings: First, the vibration excitation source is single, and high-frequency vibration and shaft system vibration cannot be simulated at the same time; second, the vibration simulation accuracy is insufficient, and it is difficult to accurately reproduce the vibration characteristics in actual working conditions; third, the test parameters are limited, and the dynamic performance of bearings cannot be fully evaluated. With the continuous advancement of industrial technology and the improvement of mechanical equipment performance requirements, higher requirements are also put forward for the test and evaluation of rolling bearings. Therefore, it is particularly important to develop a rolling bearing dynamic performance tester that can simultaneously simulate high-frequency vibration excitation and shaft system vibration excitation and has high-precision and multi-parameter testing capabilities. Therefore, the present invention provides a new and specific dynamic testing machine design scheme for the dynamic performance test and reliability design research of rolling bearings. Summary of the invention

[0003] The purpose of the present invention is to provide a rolling bearing dynamic performance testing machine that simulates high-frequency excitation and shaft system excitation, so as to solve the problem that the existing rolling bearing dynamic testing machine has a single excitation source and cannot fully simulate the real high-frequency vibration working conditions of the rolling bearing.

[0004] The purpose of the present invention and the solution to the technical problem are achieved by adopting the following technical solutions. A rolling bearing dynamic performance tester for simulating high-frequency excitation and shaft system excitation proposed in the present invention comprises a workbench, a driving device, a tester main body, an external measurement and control device, a radial loading device, an axial loading device and a radial vibration device; the tester main body is fixed on the workbench, and comprises a support seat, and the test shaft is rotatably supported on two bearing seats on the support seat through a companion test bearing; the driving device is fixed on the testbench, and is used to provide rotational power for the test shaft; the external measurement and control device is fixed on the workbench on one side of the test shaft, and is used to measure and control the dynamic vibration data of the test shaft; a test bearing is arranged on the outer periphery of the test shaft, and a bearing ring is arranged on the outer periphery of the test bearing, and a plurality of mounting grooves are arranged on the inner wall of the bearing ring at intervals along the circumferential direction, and a piezoelectric vibration piece is fixedly assembled in the mounting groove by mounting bolts, and a preload spring for providing the piezoelectric vibration piece to press the test bearing is also sleeved on the mounting bolts; the piezoelectric vibration piece is connected to an external electric control through a wire harness passing through a wire harness hole in the mounting groove, and different voltages are applied to the piezoelectric vibration piece by adjusting the external electric control, so that it generates high-frequency vibration displacements of different frequencies and transmits them to the test bearing.

[0005] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0006] The aforementioned rolling bearing dynamic performance tester simulating high-frequency excitation and shaft system excitation, the bearing ring is also provided with a sensor mounting hole extending radially, and the sensor for measuring and controlling the test bearing data is installed to the outer ring of the test bearing through the sensor mounting hole.

[0007] The aforementioned rolling bearing dynamic performance tester simulating high-frequency excitation and shaft system excitation can adjust the pressure between the piezoelectric vibration piece and the test bearing by arranging an adjustment gasket between the piezoelectric vibration piece and the bearing ring.

[0008] The above-mentioned rolling bearing dynamic performance testing machine that simulates high-frequency excitation and shaft system excitation, the test bearing includes two test bearings, which are distributed in front and behind the annular protrusion on the outer periphery of the middle part of the test shaft, and are axially stopped and limited with the annular protrusion. The end of the above-mentioned test bearing away from the annular protrusion is also provided with a limit member for axially stopping and limiting it.

[0009] The aforementioned rolling bearing dynamic performance testing machine that simulates high-frequency excitation and shaft system excitation, the limiter includes a first adjustment ring and a second adjustment ring, wherein both sides of the annular protrusion of the test shaft include a bearing seat mating section for mating with the bearing seat, and a loading section with a radial dimension larger than the bearing seat mating section and smaller than the annular protrusion is also provided between the bearing seat mating section and the annular protrusion, the test bearing is located on the loading section, the second adjustment ring is also sleeved on the outer periphery of the loading section, and one end of the second adjustment ring is stopped and limited with the inner ring of the test bearing, and the other end extends to the bearing seat mating section and is stopped and limited with the protrusion at the end of the first adjustment ring sleeved on the bearing seat mating section, and the other end of the first adjustment ring is stopped and limited with the inner ring of the test bearing.

[0010] The aforementioned rolling bearing dynamic performance testing machine that simulates high-frequency excitation and shaft system excitation, the radial loading device is fixed on the support seat, a second bearing ring is respectively provided on the outer periphery of the two test bearings, the top and bottom of the outer periphery of the two second bearing rings are respectively connected by a force baffle, and the radial loading device applies the loading force to the force baffle on the top of the second bearing ring in the form of pressure; the radial vibration device is fixed under the workbench, and the radial vibration excitation acts on the force baffle at the bottom of the second bearing ring.

[0011] The aforementioned rolling bearing dynamic performance testing machine that simulates high-frequency excitation and shaft system excitation, the front and rear ends of the second bearing ring are respectively fixed with a first bearing end cover and a second bearing end cover, and the test bearing is axially limited by the first bearing end cover and the second bearing end cover; the second bearing ring is also symmetrically provided with force-applying protrusions on both sides of the outer periphery, and the axial loading device fixed on the support seat applies axial force to the second bearing ring through the above-mentioned force-applying protrusions.

[0012] The aforementioned rolling bearing dynamic performance testing machine that simulates high-frequency excitation and shaft system excitation, the bearing seat is composed of a lower bearing seat and an upper bearing seat, wherein the lower bearing seat is fixed on the support seat, and the upper bearing seat is fixed on the lower axial seat by bolts, and a first bearing ring is also provided in the bearing seat, and the inner diameter of the bearing seat is adjusted by the bearing ring.

[0013] The aforementioned rolling bearing dynamic performance testing machine that simulates high-frequency excitation and shaft system excitation, the first bearing ring, the first adjustment ring, the second adjustment ring, the first bearing end cover and the second bearing end cover all include multiple ones with different sizes to meet the testing requirements of test shafts of different sizes.

[0014] The aforementioned rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation, the external measurement and control device includes a sensor bracket fixed on the workbench and a laser vibration sensor supported on the sensor bracket.

[0015] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technical advancement and practicality, and has wide industrial utilization value, and has at least the following advantages:

[0016] The present invention realizes the measurement and control of the test bearing and the test shaft at the same time. Compared with the traditional rolling bearing tester, the test shaft can be measured and controlled, providing effective data for the reliability research of the bearing main shaft.

[0017] This testing machine can apply high-frequency vibration excitation from the outside while applying shaft vibration excitation through the radial vibration device. Compared with traditional rolling bearing testing machines, it can simulate high-frequency vibration excitation and shaft vibration excitation at the same time, and comprehensively simulate the real vibration conditions of rolling bearings.

[0018] The present invention adopts two groups of test bearings to form a bridge structure, transmits the vibration excitation and loading force of the radial vibration device and the radial loading device to the two groups of test bearings through the force baffle, and measures and controls the two groups of test bearings. Compared with the traditional rolling bearing tester, it is more stable, and two groups of experimental data can be obtained each time, which improves the test efficiency.

[0019] The present invention realizes the simulation of high-frequency vibration excitation and can provide high-frequency vibration excitation of different intensities.

[0020] The present invention can simultaneously simulate high-frequency vibration excitation and shaft system vibration excitation, and simulate the most realistic and complex high-frequency vibration working conditions encountered by rolling bearings during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a rolling bearing dynamic performance testing machine for simulating high-frequency excitation and shaft system excitation according to the present invention;

[0022] Figure 2 This is a schematic diagram of the main structure of the testing machine;

[0023] Figure 3 It is a schematic diagram of the axial section of the testing machine body;

[0024] Figure 4 It is a schematic diagram of the structural installation of the high-frequency vibration excitation device;

[0025] Figure 5 It is a partial schematic diagram of a high-frequency vibration excitation device;

[0026] Figure 6 This is a schematic diagram of the distribution of the bearing ring holes and grooves;

[0027] Figure 7 This is a schematic diagram of the structure of the external measurement and control device.

[0028]

Main component symbol description

[0029] 1. Driving device; 2. Testing machine body; 3. External measurement and control device; 4. High-frequency vibration excitation device; 5. Radial loading device; 6. Axial loading device; 7. Radial vibration device; 8. Workbench; 9. Test shaft; 10. Upper bearing seat; 11. First test bearing; 12. First bearing ring; 13. First adjustment ring; 14. Second adjustment ring; 15. First test bearing; 16. Force baffle; 17. First bearing end cover; 18. Bolt; 19. Second bearing ring; 20. Second test bearing; 21. Second bearing end cover; 22. Second test bearing; 23. Lower bearing seat; 24. Preload spring; 25. Piezoelectric vibration plate; 26. Adjustment gasket; 27. Mounting bolt; 28. Mounting groove; 29. ​​Threaded hole; 30. Harness hole; 31. Sensor mounting hole; 32. Laser vibration sensor; 33. Sensor bracket. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation method, structure, characteristics and effects of the rolling bearing dynamic performance testing machine for simulating high-frequency excitation and shaft system excitation proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0031] See also Figure 1-7, which is a schematic diagram of the structure of each part of the rolling bearing dynamic performance tester for simulating high-frequency excitation and shaft system excitation of the present invention, the tester includes a driving device 1, a tester body 2, an external measurement and control device 3, a high-frequency vibration excitation device 4, a radial loading device 5, an axial loading device 6, a radial vibration device 7 and a workbench 8. The tester body 2 includes a support seat and a test shaft 9. The tester body 2 fixes the support seat on the workbench by bolts to complete the installation of the tester body 2. The support seat is provided with a first bearing seat and a second bearing seat in the front-to-back direction respectively. The front end of the test shaft 9 is supported in the first bearing seat by a first accompanying test bearing 11, and is supported in the second bearing seat by a second accompanying test bearing 22. The first test bearing 15 and the second test bearing 20 are sleeved along the front-to-back direction on the outer circumference of the middle part of the test shaft 9. The outer circumference of the test shaft 9 is also provided with an annular protrusion. The first test bearing 15 and the second test bearing 20 are respectively located at the front end and the rear end of the annular protrusion, and are axially stopped and limited with the annular protrusion. The front end of the first test bearing 15 and the rear end of the second test bearing 20 are respectively provided with stoppers for axially stopping the first test bearing 15 forward and axially stopping the second test bearing 20. In this embodiment, one of the stoppers is located between the front end face of the inner ring of the first test bearing 15 and the rear end face of the inner ring of the first companion test bearing 11, and the front end face of the first companion test bearing 11 is stopped by the first bearing seat. The other stopper is located between the rear end face of the inner ring of the second test bearing 20 and the front end face of the inner ring of the second companion test bearing 22, and the rear end face of the second companion test bearing 22 is stopped and limited by the second bearing seat.

[0032] In this embodiment, the stopper is composed of a first adjustment ring 13 and a second adjustment ring 14. The test shaft 9 is a stepped shaft. A loading section whose radial size is smaller than the annular protrusion and larger than the bearing seat matching section is provided between the test shaft 9 and the bearing seat matching section and the annular protrusion section in the middle. The first test bearing 15 and the second test bearing 20 are respectively located on one of the loading sections, and the second adjustment ring 14 is also sleeved on the outer circumference of the loading section, one end of which is stopped and limited by the inner ring of the first test bearing 15 or the second test bearing 20, and the other end extends to the bearing seat matching section and is stopped and limited by the protrusion at the end of the first adjustment ring 13 sleeved on the outer circumference of the bearing seat matching section, and the other end of the first adjustment ring 13 is stopped and limited by the inner ring of the first companion test bearing 11 or the second companion test bearing 22.

[0033] In this embodiment, the first bearing seat and the second bearing seat are both composed of a lower bearing seat 23 and an upper bearing seat 10, wherein the lower bearing seat 20 is integrally formed with the support seat, and the upper bearing seat 10 is fixed to the lower bearing seat by bolts. A first bearing ring 12 is also provided in the first bearing seat and the second bearing seat, and the inner diameter of the bearing seat is adjusted by the first bearing ring 12 to meet the support requirements of test shafts 9 of different sizes. In this embodiment, the inner diameter of the test bearing is 50 mm. Preferably, a stopper structure is also provided in the first bearing seat and the second bearing seat, and the stopper structure is used to stop the front end face of the first bearing ring 12 on the outer periphery of the first test bearing 11 or the rear end face of the first bearing ring 12 on the outer periphery of the second test bearing 22. A stopper structure is also provided in the first bearing ring 12, which is used to stop the front end face of the outer ring of the first test bearing 11 or the rear end face of the outer ring of the second test bearing 22.

[0034] A second bearing ring 19 is respectively provided on the outer periphery of the first test bearing 5 and the second test bearing 20, and the upper and lower ends of the outer peripheries of the two bearing rings 19 are respectively connected by a force baffle 16. The radial loading device 5 is fixed to the support seat of the test machine body 2 by bolts and is located above the test machine body. The radial loading device 5 applies the loading force to the upper force baffle 16 in the form of pressure. A through hole is provided at the bottom of the support seat corresponding to the force baffle 16 below, and a through hole is also provided at the corresponding position of the workbench 8. The radial vibration device 7 fixed below the workbench 8 applies radial vibration excitation to the force baffle 16 below the test machine body 2 through an electric exciter, thereby transmitting the vibration displacement to the first test bearing 15 and the second test bearing 20, so as to simulate the vibration excitation of the test bearing shaft system.

[0035] The first bearing end cover 17 and the second bearing end cover 21 are fixed to the front and rear ends of the second bearing ring 19, respectively. The first bearing end cover 17 and the second bearing end cover 21 can axially limit the test bearing so as to transmit the axial force to the test bearing. Both sides of the second bearing ring 19 protrude outward to form two force-applying convex parts, and the force-applying convex parts are provided with force-applying holes extending along the axial direction of the second bearing ring 19. The axial loading device 6 applies axial force to the second bearing ring 19 through the above-mentioned force-applying convex parts, and transmits it to the first test bearing 15 and the second test bearing 20. In this embodiment, the axial loading device 6 is fixed on the support seat, and applies the loading force to the second bearing ring 19 of the test machine body 2 in the form of tension, but it is not limited to this. Preferably, the actuators of the radial loading device 5 and the axial loading device 4 are hydraulic cylinders, but it is not limited to this.

[0036] The inner wall of the second bearing sleeve 19 is provided with mounting grooves 28 at intervals along the circumferential direction, and the mounting grooves 28 are provided with threaded holes 29 for bolt fixing and locking and harness holes 30 for external harnesses to enter. The wall of the first bearing sleeve 19 is also provided with sensor mounting holes 31 extending in the radial direction, and the sensor is mounted on the outer ring of the test bearing of the test machine through the sensor mounting holes 31, so as to measure and control the test bearing data. In this embodiment, the sensor includes a triaxial piezoelectric acceleration sensor and a platinum resistance temperature sensor.

[0037] The high-frequency vibration excitation device 4 includes a preload spring 24, a piezoelectric vibration piece 25, an adjustment gasket 26 and a mounting bolt 27, wherein the piezoelectric vibration piece 25 is fixed in the mounting groove 28 by the mounting bolt 27, and the mounting bolt 27 is tightened to the threaded hole 29. The piezoelectric vibration piece 25 is connected to the external electric control through the harness hole 30 in the mounting groove 28. By adjusting the external electric control to apply different voltages, the inverse piezoelectric reaction of the piezoelectric vibration piece 25 is realized, so that it generates high-frequency vibration displacements of different frequencies and transmits them to the first test bearing 15 or the second test bearing 20. The high-frequency vibration can reach up to 15kHz, realizing the simulation of the bearing being subjected to high-frequency vibration excitation. In this embodiment, there are 4 mounting grooves 28, which are evenly distributed in the second bearing ring 19, and there are 4 harness holes 30 and sensor mounting holes.

[0038] The preload spring 24 is installed between the piezoelectric vibration piece 25 and the second bearing ring 19, and the mounting bolt 27 passes through the preload spring 24. By tightening the mounting bolt 27, the preload spring 24 is compressed, and the preload spring 24 provides sufficient preload force to keep the piezoelectric vibration piece 25 in contact with the test bearing and maintain a certain pressure. By adding an adjustment gasket 26 between the piezoelectric vibration piece 25 and the bottom of the mounting groove 28, and tightening the mounting bolt 27, the piezoelectric vibration piece 25 and the adjustment gasket 26 are in rigid contact, thereby increasing the pressure between the piezoelectric vibration piece 25 and the test bearing, and by adding adjustment gaskets 26 of different thicknesses, the pressure between the piezoelectric vibration piece 25 and the test bearing can be adjusted. If the pressure applied by the piezoelectric vibration plate to the test bearing is too large, the vibration displacement and excitation will be too small, and the piezoelectric vibration plate may be crushed; if the pressure applied by the piezoelectric vibration plate to the test bearing is too small, the excitation cannot be effectively transmitted to the test bearing; the present invention realizes that the pressure applied by the piezoelectric vibration plate to the test bearing is adjustable, and various types of test bearings and various different test conditions can be comprehensively tested.

[0039] In the embodiment of the present invention, the preload spring 24 is made of carbon spring steel wire, and the piezoelectric vibration piece 25 is made of a ceramic piezoelectric vibration piece.

[0040] The driving device 1 is fixed on the workbench 8 and is used to provide rotational power for the test shaft 9. In this embodiment, the driving device 1 is an electric spindle, and the electric spindle coupling is installed on one side of the test machine body 2 and connected to the workbench 8 through the electric spindle base.

[0041] The external measurement and control device 3 is located on one side of the test shaft 9, connected to the workbench by bolts, and is used to measure and control the dynamic vibration data of the test shaft 9. In this embodiment, the external measurement and control device 3 includes a laser vibration sensor 30 and a sensor bracket 33. The laser vibration sensor 32 is fixed to the workbench 8 by bolts through the sensor bracket 33. The measurement and control position of the laser vibration sensor 32 is controlled by adjusting the height of the sensor bracket 33, so as to realize the detection of vibration parameter tables of test shafts 9 of different sizes.

[0042] This embodiment can realize the measurement and control of the vibration parameters, temperature parameters, life of the test bearing and the vibration parameters of the test spindle.

[0043] In this embodiment, the power is provided by the electric spindle of the driving device 1 to achieve a maximum speed of 30,000 r / min. By replacing the test shaft 9, the first adjustment ring 13, the second adjustment ring 14, the first bearing end cover 17, the second bearing ring 19 and the second bearing end cover 21 of different sizes, corresponding tests of different speeds for rolling bearings of different sizes and types can be achieved.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A rolling bearing dynamic performance tester for simulating high-frequency excitation and shaft system excitation, comprising a workbench, a driving device, a tester body, an external measurement and control device, a radial loading device, an axial loading device and a radial vibration device; the tester body is fixed on the workbench, and comprises a support seat, and a test shaft is rotatably supported on two bearing seats on the support seat through a companion test bearing; the driving device is fixed on the testbench, and is used to provide rotational power for the test shaft; the external measurement and control device is fixed on the workbench on one side of the test shaft, and is used to measure and control the dynamic vibration data of the test shaft; it is characterized in that: A test bearing is provided on the outer periphery of the test shaft, and a bearing ring is provided on the outer periphery of the test bearing. A plurality of mounting grooves are provided on the inner wall of the bearing ring at intervals in the circumferential direction. The piezoelectric vibration piece is fixedly assembled in the mounting groove by mounting bolts. The mounting bolts are also sleeved with a preload spring for providing the piezoelectric vibration piece with pressure to press the test bearing. The piezoelectric vibration piece is connected to an external electric control via a wiring harness passing through a wiring harness hole in the mounting groove. Different voltages are applied to the piezoelectric vibration piece by adjusting the external electric control, so that high-frequency vibration displacements of different frequencies are generated and transmitted to the test bearing.

2. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 1 is characterized in that: The bearing ring is also provided with a sensor mounting hole extending in the radial direction, and a sensor for measuring and controlling the test bearing data is mounted to the outer ring of the test bearing through the sensor mounting hole.

3. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 2 is characterized in that: The pressure between the piezoelectric vibration piece and the test bearing can be adjusted by arranging an adjustment gasket between the piezoelectric vibration piece and the bearing ring.

4. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to any one of claims 1 to 3, characterized in that: The test bearing includes two test bearings, which are distributed in front and behind the annular protrusion on the outer periphery of the middle part of the test shaft and are axially stopped and limited by the annular protrusion. The end of the test bearing away from the annular protrusion is also provided with a limiting member for axially stopping and limiting it.

5. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 4 is characterized in that: The limiting member includes a first adjusting ring and a second adjusting ring, wherein both sides of the annular protrusion of the test shaft include a bearing seat matching section for matching with the bearing seat, and a loading section with a radial dimension larger than the bearing seat matching section and smaller than the annular protrusion is provided between the bearing seat matching section and the annular protrusion, the test bearing is located on the loading section, and the second adjusting ring is also sleeved on the outer circumference of the loading section, and one end of the second adjusting ring is stopped and limited by the inner ring of the test bearing, and the other end extends to the bearing seat matching section and is stopped and limited by the end protrusion of the first adjusting ring sleeved on the bearing seat matching section, and the other end of the first adjusting ring is stopped and limited by the inner ring of the companion test bearing.

6. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 5 is characterized in that: The radial loading device is fixed on the support seat, and a second bearing ring is respectively provided on the outer periphery of the two test bearings. The top and bottom of the outer periphery of the two second bearing rings are respectively connected by a force baffle plate. The radial loading device applies the loading force to the force baffle plate at the top of the second bearing ring in the form of pressure; the radial vibration device is fixed under the workbench, and applies radial vibration excitation to the force baffle plate at the bottom of the second bearing ring.

7. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 6 is characterized in that: The front and rear ends of the second bearing ring are respectively fixed with the first bearing end cover and the second bearing end cover, and the test bearing is axially limited by the first bearing end cover and the second bearing end cover; the second bearing ring is also symmetrically provided with force-applying protrusions on both sides of the outer periphery, and the axial loading device fixed on the support seat applies axial force to the second bearing ring through the above-mentioned force-applying protrusions.

8. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 7 is characterized in that: The bearing seat is composed of a lower bearing seat and an upper bearing seat, wherein the lower bearing seat is fixed on the support seat, and the upper bearing seat is fixed on the lower axial seat by bolts, and a first bearing ring is also provided in the bearing seat, and the inner diameter of the bearing seat is adjusted by the bearing ring.

9. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 8, characterized in that: The first bearing sleeve ring, the first adjustment ring, the second adjustment ring, the first bearing end cover and the second bearing end cover all include a plurality of bearings with different sizes to meet the testing requirements of test shafts of different sizes.

10. The rolling bearing dynamic performance testing machine simulating high-frequency excitation and shaft system excitation according to claim 8, characterized in that: The external measurement and control device comprises a sensor bracket fixed on a workbench and a laser vibration sensor supported on the sensor bracket; the sensor bracket is height-adjustable to meet the measurement requirements of test shafts of different sizes.

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