Multi-target load-controllable bearing experiment table

Abstract

The invention relates to a multi-target load-controllable bearing experiment table, which comprises a base table, the device comprises a base station, a main shaft rotatably arranged on the base station, a power unit in driving connection with the main shaft, a test bearing seat, a test bearing assembled on the test bearing seat and sleeved on the main shaft, and a load loading device for applying a load to the test bearing seat in a hydraulic driving manner, the load loading device comprises a first axial loading assembly and a second axial loading assembly, the first axial loading assembly and the second axial loading assembly are located on the two sides of the axial direction of the test bearing pedestal respectively, and the first axial loading assembly and the second axial loading assembly are each provided with a plurality of independently-controlled first hydraulic rods so as to apply asymmetric loads to the test bearing pedestal; the first axial loading assembly and the second axial loading assembly which are provided with the multiple independent control first hydraulic rods are arranged on the two axial sides of the test bearing seat respectively, the hydraulic force and the acting direction of the hydraulic rods on the two sides can be independently adjusted according to actual requirements, and the core problems that in the prior art, load simulation is single, and the working condition reduction degree is insufficient are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale wind power bearing performance testing, and in particular to a multi-target load-controllable bearing test bench. Background Art

[0002] As a core component of a wind turbine generator set, the performance of the wind turbine main shaft bearing-rotor system is directly related to the stable operation and service life of the unit. Performance testing of this system under multiple target loads is a key step in the research and development process. However, test benches in the prior art have significant shortcomings: for example, the sliding bearing test bench disclosed in Reference Document 1 (CN109030000B) adopts a single-side load loading design, which can only apply axial loads via the right annular cylinder and radial loads via the bottom hydraulic rod. It cannot achieve independent control of the asymmetric axial loads on both sides, and it is even more difficult to simulate the overturning moment and multi-directional "swaying" conditions caused by factors such as impeller imbalance during actual operation of the wind turbine main bearing.

[0003] At the same time, the existing test bench has limitations in parameter monitoring and does not involve real-time monitoring of key parameters such as preload force measurement and lubricating oil debris detection.

[0004] Furthermore, existing bearing seats are often monolithic, requiring axial movement of the bearings for disassembly. This is complex and prone to component damage, resulting in high test bench maintenance costs and low testing efficiency. To address these issues, such as single load simulation and insufficient monitoring capabilities, the present invention provides a wind turbine main bearing-rotor system simulation test bench with controllable multi-target loads to address these technical issues. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a multi-objective load-controllable bearing test bench, aiming to solve one or more problems in the background technology.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a multi-target load-controllable bearing test bench, comprising: a base, a main shaft rotatably arranged on the base, a power unit driven by the main shaft, a test bearing seat, and a test bearing assembled on the test bearing seat and sleeved on the main shaft, and a load loading device for applying a load to the test bearing seat by hydraulic drive, wherein the load loading device comprises a first axial loading component and a second axial loading component, the first axial loading component and the second axial loading component are respectively located on both sides of the axial direction of the test bearing seat, and the first axial loading component and the second axial loading component both have multiple independently controlled first hydraulic rods to apply asymmetric loads to the test bearing seat.

[0007] Furthermore, the first axial loading device includes two symmetrically arranged groups of half-circular ring hydraulic loading devices, each group of half-circular ring hydraulic loading devices includes multiple circumferentially distributed independently controlled hydraulic rods, and the output ends of the hydraulic rods act on the outer walls on both sides of the axial direction of the test bearing seat.

[0008] Furthermore, the test bearing seat has axial and radial degrees of freedom, and the load loading device also includes a radial loading component, which is arranged on the base and located on one side of the test bearing seat. The loading direction of the radial loading device is perpendicular to the axis of the main shaft.

[0009] Furthermore, it also includes a test system, which includes: a stress sensor, installed in the grooves on the two end surfaces of the test bearing seat, for measuring the preload force; a speed sensor and an acceleration sensor, respectively arranged around the circumference of the test bearing and the bearing seat, for monitoring the rotational speed and axial and radial acceleration.

[0010] Furthermore, the test system also includes a torque sensor fixedly mounted on the base, the driving unit is a motor, and the torque sensor is arranged between the motor output shaft and the main shaft for measuring the transmission torque; the motor output shaft is connected to one end of the torque sensor through a coupling, and the main shaft is connected to the other end of the torque sensor through a coupling.

[0011] Furthermore, fixed seats corresponding to the first axial loading assembly and the second axial loading assembly are relatively arranged on both axial sides of the test bearing seat. The fixed seats are fixed in the axial direction of the main shaft, and the first hydraulic rods of the first axial loading assembly and the second axial loading assembly are fixedly set on the corresponding fixed seats.

[0012] Furthermore, both ends of the test bearing seat shaft are provided with annular grooves corresponding to the load loading device, and multiple first hydraulic rods are distributed in annular intervals on one side of the fixed seat close to the test bearing seat, and the output ends of the first hydraulic rods extend into the grooves.

[0013] Furthermore, a box is provided on the base plate, and support bearings are provided on both side walls of the box perpendicular to the main shaft. The main shaft is a stepped shaft, and there are two test bearings. The two test bearings are installed on the step in the middle of the main shaft, and the two support bearings are installed at the contact points with the two ends of the main shaft. The middle step of the main shaft is higher than the steps at both ends to form a multi-point support structure.

[0014] Furthermore, the radial loading device includes a second hydraulic rod and a force plate. The second hydraulic rod is fixedly arranged on the box body. The second hydraulic rod is connected to the force plate through a hinge. The force plate presses the radial outer wall of the test bearing seat. The radial load loading direction is perpendicular to the main shaft axis.

[0015] Furthermore, it also includes a lubrication device, which includes: an oil supply component, including an oil nozzle and a pressure valve, the oil nozzle is directed toward the test bearing, and the lubricating oil is pressurized by the pressure valve and sprayed to the test bearing by the oil nozzle; a circulation component, including a filtering device with an oil pump and a debris detection device, the lubricating oil after lubrication is filtered out of impurities by the filtering device, and then monitored for debris by the debris detection device, and finally returned to the lubrication system.

[0016] The present invention describes a multi-target load-controllable bearing test bench, which has the beneficial effect of providing a first axial loading assembly and a second axial loading assembly with multiple independently controlled first hydraulic rods on both axial sides of the test bearing seat, respectively. The hydraulic pressure and action direction of the hydraulic rods on both sides can be independently adjusted according to actual needs, and an asymmetric axial load can be applied to the test bearing seat, thereby accurately simulating the multi-target stress state of the wind turbine main shaft bearing-rotor system under complex working conditions, significantly improving the test bench's simulation capability of real working scenarios, and providing more comprehensive and reliable load simulation conditions for the performance testing and development of wind turbine main bearings, effectively solving the core problems of single load simulation and insufficient working condition restoration in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of a load loading device according to an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of a half-section bearing seat according to an embodiment of the present invention.

[0020] Explanation of the accompanying drawings: 1. Base; 101. Motor; 102. Torque sensor; 103. Coupling; 104. Debris detection device; 105. Filter device; 201. Main shaft; 301. Reinforcement rib; 302. Second hydraulic rod; 303. Force plate; 304. Embedded ear; 305. Support bearing; 306. Fixed base; 307. Test bearing; 308. Half-split bearing seat; 309. First hydraulic rod; 310. Box; 401. Lubricating oil return point; 501. Speed sensor; 502. Acceleration sensor; 503. Temperature sensor; 504. Stress sensor; 505. Temperature sensor; 6. Test bearing seat. DETAILED DESCRIPTION

[0021] Typical embodiments embodying the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative rather than limiting.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0023] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] like Figure 1-3 As shown, an embodiment of the present invention provides a multi-target load-controllable bearing test bench, comprising: a base 1, a spindle 201, a power unit, a test bearing seat 6, a test bearing 307, and a load-applying device. The spindle 201 is rotatably mounted on the base 1, and the power unit is connected to the spindle 201 to provide rotational power. The test bearing 307 is sleeved on the spindle 201 and assembled within the test bearing seat 6, which is movable axially and radially along the spindle 201. The load-applying device is hydraulically driven and includes a first axial loading assembly and a second axial loading assembly, respectively, disposed on either axial side of the test bearing seat 6. Each loading assembly includes multiple independently controlled first hydraulic rods 309. The output end of each hydraulic rod acts on the axial outer wall of the test bearing seat 6. By independently adjusting the hydraulic pressure and direction of action of the two hydraulic rods, asymmetric axial loads can be applied to the test bearing seat 6. Furthermore, the load-applying device can also be equipped with a radial loading assembly to apply a radial load perpendicular to the axis of the spindle 201, achieving controllable loading of multi-dimensional composite loads.

[0025] In response to the defects of the existing test bench in the prior art that it can only apply unilateral symmetrical loads and cannot simulate the asymmetric stress scenarios in the actual working conditions of the wind turbine main shaft 201 bearing, this solution breaks through the limitations of traditional unilateral loading by setting up independently controlled first hydraulic rods 309 groups on both axial sides of the test bearing seat 6. For example, the sliding bearing test bench of the prior art can only apply symmetrical axial loads through a single-sided annular cylinder and cannot simulate the overturning moment caused by impeller imbalance. However, the present invention can accurately simulate the asymmetric axial loads borne by the bearing under complex working conditions through the differentiated control of the first hydraulic rods 309 on both sides, thereby realizing dynamic simulation of the overturning moment. This design enables the test bench to truly restore the multi-directional "movement" working conditions of the wind turbine main shaft 201 bearing-rotor system in actual operation, solving the core problem of the prior art that the load simulation is single and cannot meet the requirements of multi-target testing, and providing more comprehensive test support for the performance research and development of wind turbine bearings.

[0026] Furthermore, the above-mentioned first axial loading assembly and second axial loading assembly are symmetrically arranged on both sides of the test bearing seat 6 to realize multi-directional load application. Among them, the first axial loading assembly is composed of two groups of symmetrically arranged half-circular ring hydraulic loading devices, and each group of half-circular ring hydraulic loading devices is an independent detachable structure, which is composed of two half-circular rings, forming an annular loading unit around the axial side of the test bearing seat 6. Six independently controlled first hydraulic rods 309 are evenly distributed in the circumference of each group of half-circular rings. The first axial loading assembly has a total of 12 first hydraulic rods 309, and each first hydraulic rod 309 extends axially along the main shaft 201, and its output end directly acts on the outer wall surface of the axial side of the test bearing seat 6; the structure of the second axial loading assembly is the same as that of the first axial loading assembly, and cooperates with the first axial loading assembly to realize bidirectional load application.

[0027] The detachable design of the above-mentioned half-split ring facilitates the maintenance and debugging of the loading device. For example, when replacing the first hydraulic rod 309 or adjusting the load distribution, there is no need to disassemble the test bearing seat 6 as a whole. The operation can be completed by simply splitting the corresponding half-split ring, which greatly shortens the debugging cycle.

[0028] Furthermore, the above-mentioned test bearing seat 6 adopts a semi-sectioned detachable structural design, including an upper seat body and a lower seat body, which are fastened together by high-strength bolts evenly distributed along the circumference to form a complete bearing seat cavity; this semi-sectioned structure does not require axial movement of the bearing during disassembly, and only needs to loosen the bolts to separate the upper seat body and the lower seat body, quickly exposing the outer ring of the test bearing 307, significantly simplifying the bearing installation, debugging and replacement process, while avoiding the damage that may be caused to the bearing during disassembly of the traditional integral structure, effectively improving the maintenance efficiency of the test bench and the convenience of bearing testing.

[0029] Furthermore, the above-mentioned test bearing 307 also has radial freedom, and the above-mentioned load loading device also includes a radial loading component, which is fixedly arranged on the base 1 and located on one side of the test bearing seat 6. The specific structure is: the radial loading component includes a second hydraulic rod 302 and a force disk 303, the cylinder body of the second hydraulic rod 302 is fixed to the base 1, and the piston rod is connected to the force disk 303 through a hinge. The working surface of the force disk 303 is in contact with the radial outer wall surface of the test bearing seat 6. When the second hydraulic rod 302 is working, the piston rod drives the force disk 303 to apply a radial load to the test bearing seat 6 in a direction perpendicular to the axis of the main shaft 201, thereby realizing independent or coordinated loading of axial load and radial load, meeting the requirements of multi-target load simulation.

[0030] Furthermore, annular grooves are defined at each axial end of the test bearing seat 6, extending circumferentially along the test bearing seat 6 to form a closed-loop structure. The hydraulic rods of the first axial loading assembly are evenly distributed on a fixed seat 306 on one axial side of the test bearing seat 6. The output ends of each hydraulic rod are radially arranged and extend into corresponding annular grooves. When the test bearing seat 6 rotates circumferentially due to the rotation of the main shaft 201 or the action of a load, the output ends of the hydraulic rods can slide circumferentially within the annular grooves, thereby allowing the test bearing seat 6 to rotate circumferentially while bearing axial load, avoiding the limitation of its freedom due to rigid contact.

[0031] The groove width of the above-mentioned annular groove is larger than the diameter of the output end of the hydraulic rod, forming a clearance fit, which not only ensures that the output end of the hydraulic rod can freely extend into the groove, but also provides sufficient sliding space for the circumferential rotation of the test bearing seat 6. The clearance fit design ensures that the output end of the hydraulic rod will not hinder the circumferential rotation of the test bearing seat 6 while applying axial load.

[0032] Furthermore, it also includes a test system, which integrates multiple types of sensors and monitoring components to collect multi-dimensional parameters of bearing operation in real time: the stress sensor 504 is embedded in the stepped grooves on the two end surfaces of the test bearing seat 6, and the groove depth is adapted to the sensor size to ensure that the sensor end face is flush with the bearing seat surface, so as to accurately measure the preload force of the test bearing 307 during installation; the torque sensor 102 is arranged between the output shaft of the motor 101 and the main shaft 201, and is coaxially connected to the two through the elastic coupling 103, and is used to monitor the torque change during the transmission process; the speed sensor 501 is fixed to the outer ring surface of the test bearing 307 through a magnetic bracket, and is evenly distributed 2-4 along the circumference. measuring points to capture bearing speed data in real time; the acceleration sensor 502 adopts a three-axis vibration sensor, which is respectively arranged on the top, bottom and both sides of the outer wall of the test bearing seat 6 to monitor axial, radial and circumferential acceleration; the temperature sensors 503 and 505 are divided into two groups, one group is symmetrically arranged on the upper and lower sides of the test bearing 307 through a high-temperature resistant bracket and does not contact the bearing, and the other group is embedded in the inner wall of the load loading device cavity, which is used to measure the bearing surface temperature rise and lubricating oil temperature respectively; in addition, the debris detection device 104 is integrated in the lubricating oil return line, located downstream of the filter device 105, and monitors the metal debris content in the oil in real time through the laser scattering principle to assist in evaluating the bearing wear status.

[0033] The specific installation structure of the torque sensor 102 in the test system is as follows: the output shaft of the motor 101 is connected to one end of the torque sensor 102 through the coupling 103, and the main shaft 201 is connected to the other end of the torque sensor 102 through the coupling 103. The couplings 103 at both ends use elastic couplings 103 to compensate for axial and radial deviations; the outer shell of the torque sensor 102 is rigidly fixed to the base 1 through a bracket.

[0034] Furthermore, fixed seats 306 are provided on either axial side of the test bearing seat 6. These seats remain fixed in both the axial and radial directions of the spindle 201, providing a stable support base for the axial loading assembly. The first hydraulic rods 309 of the first and second axial loading assemblies are fixedly mounted on the fixed seats 306 on their respective sides, with the cylinder axis parallel to the axis of the spindle 201, ensuring precise transmission of the axial load. The rigid design of the fixed seats 306 effectively prevents load deviation caused by structural deformation during loading, thereby enhancing the stability of the testing system.

[0035] Furthermore, a hollow housing 310 is fixedly mounted on the base plate. Support bearings 305 are mounted on the two side walls of the housing 310 perpendicular to the main shaft 201. The main shaft 201 is a stepped shaft, with the diameter of the middle section larger than the end sections, forming a stepped structure with a higher middle section and lower ends. Two test bearings 307 are respectively fitted onto the steps of the middle section of the main shaft 201, achieving axial positioning via shaft shoulders. Two support bearings 305 are mounted at the contact points between the end sections of the main shaft 201 and the side walls of the housing 310, forming a multi-point support structure of "middle test bearing 307 + end support bearings 305." By designing the middle step of the main shaft 201 higher than the end steps, this structure effectively disperses the radial load during operation of the main shaft 201, improving the overall stiffness and anti-overturning capability of the bearing-rotor system. This structure is suitable for simulating the stress state of the wind turbine main shaft 201 bearings under complex operating conditions.

[0036] Furthermore, a half-section bearing seat 308 is provided on the housing 310 at a position corresponding to the support bearing 305, and the support bearing 305 is installed in a half-section detachable bearing seat. The half-section bearing seat 308 is composed of an upper and lower half-section structure, and the two half-section structures are fastened together by bolts evenly distributed along the circumference to form a complete bearing installation cavity. When the support bearing 305 needs to be replaced, it is only necessary to remove the bolts to separate the two half-section structures, quickly remove the old bearing and install the new bearing, without the need to disassemble the main shaft 201 or the housing 310 as a whole. The design of the half-section bearing seat 308 significantly improves the maintenance efficiency and bearing type adaptability of the test bench, can meet the testing requirements of support bearings 305 of different specifications, and enhances the versatility of the equipment.

[0037] Furthermore, an embedded ear 304 structure is provided on the fixing seat 306, and the embedded ear 304 matches the inner wall slot of the load loading device box 310. The axial and radial positioning of the fixing seat 306 in the box 310 is achieved by embedding the embedded ear 304 into the slot; the fixing seat 306 is connected to the box 310 through the embedded ear 304-slot positioning structure, forming a layered fixing system of "fixed seat 306 embedded in the box 310-box 310 fixed to the base 1", which not only ensures the installation accuracy of the load loading device, but also facilitates disassembly and maintenance.

[0038] Furthermore, the second hydraulic rod 302 of the radial loading device is fixed to the outer wall of the box body 310 and supported by the reinforcing rib 301 .

[0039] Furthermore, it includes an integrated lubrication device with a "precise oil supply - circulating filtration - real-time detection" integrated structure. The oil supply assembly includes an oil nozzle, a pressure valve, and an oil pump. The oil nozzle is fixedly mounted through the upper end cover to the center hole of the test bearing seat 6, directly above the two test bearings 307. The oil nozzle outlet is aligned with the raceway area of the test bearing 307. The lubricating oil is delivered by the oil pump to the pressure valve. After being adjusted to the operating pressure by the pressure valve, it is sprayed in a mist form through the oil nozzle onto the friction surface of the test bearing 307, achieving precise quantitative lubrication. The oil supply pipeline is made of stainless steel, with a polished inner wall to reduce oil flow resistance. The outer surface of the pipeline is wrapped with an insulation layer to maintain a stable lubricating oil temperature.

[0040] The circulation assembly includes a filter device 105 with an oil pump, a debris detection device 104, and a return line. After lubrication, the lubricating oil flows through the guide groove at the bottom of the test bearing seat 6 into the lubricating oil return 401 at the bottom of the housing 310. It first passes through the filter device 105 with an oil pump to remove impurities such as metal debris and dust. The oil then enters the debris detection device 104, where the wear particle content in the oil is monitored in real time. The tested lubricating oil returns to the oil tank through the return line, forming a closed circulation system. The filter device 105 and the debris detection device 104 are connected in series and both are equipped with quick-release interfaces to facilitate filter element replacement and detection module maintenance, ensuring long-term stable operation of the lubrication system.

[0041] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A multi-target load controllable bearing test bench, characterized in that: include: A base, a main shaft rotatably arranged on the base, a power unit driven by the main shaft, a test bearing seat, a test bearing assembled on the test bearing seat and sleeved on the main shaft, and a load loading device for applying a load to the test bearing seat by hydraulic drive; wherein the load loading device includes a first axial loading component and a second axial loading component, the first axial loading component and the second axial loading component are respectively located on both sides of the axial direction of the test bearing seat, and the first axial loading component and the second axial loading component both have multiple independently controlled first hydraulic rods to apply an asymmetric load to the test bearing seat.

2. The multi-objective load-controllable bearing test bench according to claim 1 is characterized in that: The first axial loading device includes two groups of symmetrically arranged half-circular ring hydraulic loading devices, each group of half-circular ring hydraulic loading devices includes multiple circumferentially distributed independently controlled hydraulic rods, and the output ends of the hydraulic rods act on the outer walls on both sides of the axial direction of the test bearing seat.

3. The multi-objective load-controllable bearing test bench according to claim 2 is characterized in that: The test bearing seat has axial and radial degrees of freedom. The load loading device also includes a radial loading component, which is arranged on the base and located on one side of the test bearing seat. The loading direction of the radial loading device is perpendicular to the axis of the main shaft.

4. The multi-objective load controllable bearing test bench according to claim 1, characterized in that: It also includes a test system, which includes: a stress sensor installed in the grooves on the two end surfaces of the test bearing seat for measuring the preload force; a speed sensor and an acceleration sensor, which are respectively arranged around the circumference of the test bearing and the bearing seat for monitoring the rotational speed and axial and radial acceleration.

5. The multi-objective load controllable bearing test bench according to claim 4, characterized in that: The test system also includes a torque sensor fixedly mounted on the base. The driving unit is a motor. The torque sensor is arranged between the motor output shaft and the main shaft for measuring the transmission torque. The motor output shaft is connected to one end of the torque sensor through a coupling, and the main shaft is connected to the other end of the torque sensor through a coupling.

6. The multi-objective load controllable bearing test bench according to claim 3, characterized in that: Fixed seats corresponding to the first axial loading assembly and the second axial loading assembly are also arranged on both axial sides of the test bearing seat. The fixed seats are fixed in the axial direction of the main shaft, and the first hydraulic rods of the first axial loading assembly and the second axial loading assembly are fixedly set on the corresponding fixed seats.

7. The multi-objective load controllable bearing test bench according to claim 6, characterized in that: Both ends of the test bearing seat shaft are provided with annular grooves corresponding to the load loading device, and multiple first hydraulic rods are distributed in annular intervals on one side of the fixed seat close to the test bearing seat, and the output ends of the first hydraulic rods extend into the grooves.

8. The multi-objective load controllable bearing test bench according to claim 7, characterized in that: A box is also provided on the base plate, and support bearings are provided on both side walls of the box perpendicular to the main shaft. The main shaft is a stepped shaft, and there are two test bearings. The two test bearings are installed on the step in the middle of the main shaft, and the two support bearings are installed at the contact points with the two ends of the main shaft. The middle step of the main shaft is higher than the steps at both ends to form a multi-point support structure.

9. The multi-objective load-controllable bearing test bench according to claim 8, characterized in that: The radial loading device includes a second hydraulic rod and a force plate. The second hydraulic rod is fixed on the box body and is connected to the force plate through a hinge. The force plate presses the radial outer wall of the test bearing seat, and the radial load loading direction is perpendicular to the main shaft axis.

10. The multi-objective load controllable bearing test bench according to claim 1, characterized in that: It also includes a lubrication device, which includes: an oil supply component, including an oil nozzle and a pressure valve, the oil nozzle is directed toward the test bearing, and the lubricating oil is pressurized by the pressure valve and sprayed to the test bearing by the oil nozzle; a circulation component, including a filtering device with an oil pump and a debris detection device, the lubricating oil after lubrication is filtered out of impurities by the filtering device, and then monitored for debris by the debris detection device, and finally returned to the lubrication system.

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