Test system and method for industrial bearing revolution and rotation mixed durability test

Abstract

The application discloses a test system and method for industrial bearing revolution and rotation mixed endurance test, wherein a planetary gear train is arranged in a test gearbox for mounting a bearing to be tested and providing a composite motion working condition for simultaneously performing revolution and rotation; a driving device is connected with an input end of the test gearbox through a belt transmission component for driving the planetary gear train to operate; a loading device is arranged on the test gearbox for applying a radial load to the bearing to be tested mounted in the planetary gear train; and a monitoring control system is used for collecting state parameters of the test gearbox during operation and controlling the driving device and the loading device. The application can simulate actual operation working conditions of the planetary gear of the gearbox under the coupling action of revolution and rotation, and synchronously collect data such as vibration, temperature, rotating speed and current of key positions of the test bed, so as to comprehensively judge the operation state of the test bed and the performance of the bearing to be tested.

Description

Technical Field

[0001] This invention relates to mechanical engineering testing technology and equipment, specifically a bearing performance and durability testing bench, and more particularly to a testing system and method for mixed durability testing of industrial bearings' revolution and rotation. Background Technology

[0002] As a critical component in mechanical equipment, bearings' performance and reliability directly affect the lifespan and operational safety of the main equipment. To evaluate the durability of bearings under actual complex working conditions, simulation verification is required using a dedicated testing bench.

[0003] Currently, common bearing testing equipment both domestically and internationally falls into two main categories: one type performs comprehensive performance testing on the entire machine, such as gearboxes containing bearings; the other type applies simple loads such as radial, axial, or bending moments to individual bearings for operational testing. However, in transmission systems such as wind turbine gearboxes, the bearings within planetary gear trains simultaneously experience rotation around their own axis and revolution around a central axis, a complex motion state. Their stress conditions differ significantly from those of bearings subjected to simple rotation or static support. Existing testing devices fail to realistically simulate the complex coupled rotation and revolution conditions experienced by planetary bearings in actual operation, leading to deviations between test conditions and the actual service conditions of the bearings. This makes it difficult to accurately reflect their performance and lifespan in specific application scenarios such as wind turbine gearboxes.

[0004] Therefore, there is an urgent need to develop a hybrid durability testing system that can accurately simulate the simultaneous rotation and revolution of planetary gear bearings, so as to more realistically reproduce their working state and simultaneously monitor and analyze multiple parameters such as vibration, temperature, speed, and current during the testing process, thereby providing an effective basis for bearing design improvement, reliability assessment and fault diagnosis. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and propose a test system and method for the mixed durability test of industrial bearings' revolution and rotation. This system simulates the actual operating conditions of planetary gears in a gearbox under the coupled action of rotation and revolution, and simultaneously collects data such as vibration, temperature, speed, and current at key locations on the test bench, thereby comprehensively judging the operating status of the test bench and the performance of the tested bearing.

[0006] The objective of this invention can be achieved through the following technical solutions.

[0007] A test bench system for performing mixed durability testing of industrial bearings' revolution and rotation includes: The test gearbox contains a planetary gear train, which is used to install the bearing to be tested and provide it with a compound motion condition of simultaneous rotation and revolution. The drive unit is connected to the input end of the test gearbox via a belt drive component and is used to drive the planetary gear train to rotate. A loading device, disposed on the test gearbox, is used to apply a radial load to the bearing to be tested installed in the planetary gear train; The monitoring and control system is used to collect the status parameters of the test gearbox during operation and to control the drive device and loading device.

[0008] Furthermore, the test gearbox includes a housing, which is cylindrical in shape. An internal gear ring is coaxially arranged inside the housing, and a planetary carrier is coaxially arranged inside the internal gear ring. A central shaft is coaxially arranged inside the planetary carrier. One end of the central shaft is rotatably connected to the housing, and the other end is connected to the output end of a belt drive component. A central shaft pinion is coaxially fixed on the outer ring of the central shaft. Three planetary gear sets mesh between the central shaft pinion and the internal gear ring. Each planetary gear set includes a planetary pinion, which meshes with both the internal gear ring and the central shaft pinion. A planetary gear shaft is coaxially arranged inside the planetary pinion, and both ends of the planetary gear shaft are located in the support holes of the planetary carrier. The bearing to be tested is installed between the planetary gear shaft and the planetary pinion.

[0009] Furthermore, the driving device includes a servo motor and a motor control cabinet. The motor control cabinet is electrically connected to both the servo motor and the PLC control cabinet. The output shaft of the servo motor is connected to the input end of the belt drive component, and the output end of the belt drive component is connected to the input shaft of the test gearbox. The PLC control cabinet controls the start, stop, speed, and torque of the servo motor through the motor control cabinet. The servo motor drives the central shaft and its outer ring central shaft pinion to rotate synchronously through the belt drive component. Under the meshing action of the gears, the planetary pinion rotates around its own axis and revolves around the central shaft pinion. At the same time, the motor control cabinet feeds back the status signal of the servo motor to the PLC control cabinet.

[0010] Furthermore, the loading device includes a loading bolt, which is disposed on the test gearbox and is used to connect the planetary gear shaft and the planet carrier. By tightening the loading bolt, pressure is applied to the planetary gear shaft, and the radial load is transferred to the bearing under test.

[0011] Furthermore, the monitoring and control system includes a host computer operating console, a PLC control cabinet, and a sensor group. The host computer operating console is used to set test parameters, monitor in real time, display and store test data, and provide fault alarms. The PLC control cabinet is responsible for receiving instructions from the host computer operating console and controlling the enabling of the servo motor, the start and stop of the lubrication station and cooling system, and simultaneously collecting signals from various sensors and the current and torque signals of the servo motor. The sensor group includes an oil temperature sensor, an oil pressure sensor, a cooling water temperature sensor, a vibration sensor, a speed sensor, and a gearbox temperature sensor, which are used to collect the lubricating oil temperature in the lubrication station, the inlet and outlet water temperatures of the cooling system, and the vibration, temperature, and speed of the test gearbox in real time. The signal data collected in real time by these sensors are transmitted to the host computer operating console via the PLC control cabinet for centralized processing and display.

[0012] Furthermore, the system also includes a lubrication and cooling system, which includes a lubrication station and a cooling system. The lubrication station is connected to the inside of the test gearbox via an oil circuit and is used to spray lubricating oil onto the contact area between the rollers and raceways of the bearing under test and the gear meshing area. The cooling system is used to cool the lubricating oil in the lubrication station to maintain a constant lubricating oil temperature.

[0013] Furthermore, the test gearbox, belt drive components, and servo motor are all mounted on the base platform, which is also equipped with a power distribution box for supplying power to each component.

[0014] The objective of this invention can also be achieved through the following technical solutions.

[0015] A test method for performing mixed durability testing of industrial bearings' revolution and rotation includes the following steps: S1. Installation and Loading: Install the bearing to be tested in the planetary gear train of the test gearbox, and apply a preset radial load to the bearing to be tested through the loading device. S2. System Start-up and Operation: Start the test bench system and drive the planetary gear train to rotate through the drive device, so that the bearing under test performs a compound motion of rotation and revolution at the set speed. S3. Data Acquisition and Monitoring: During the durability test, the temperature, torque, current, vibration, and speed parameters are collected and recorded in real time through the monitoring and control system. S4. Status Judgment: Based on the data collected in step S3, determine the operating status of the test bench system and the performance status of the bearing to be tested.

[0016] Furthermore, in step S2, before starting the drive device, the lubrication station is started first to perform forced lubrication on the bearing and gear to be tested for a preset time; the monitoring and control system controls the operation of the cooling system according to the collected lubricating oil temperature signal so that the lubricating oil temperature is kept within the set range.

[0017] Compared with the prior art, the beneficial effects of the technical solution of the present invention are: (1) It can truly simulate the combined stress conditions of bearings in actual gearboxes, and the test results are more valuable for engineering guidance.

[0018] This invention, by setting up a test gearbox containing a planetary gear train, allows the bearing under test to simultaneously undergo "rotation" around its own axis and "revolution" around its central axis during operation. This accurately reproduces the real motion state of planetary bearings in equipment such as wind turbine gearboxes, overcoming the shortcomings of existing testing equipment that can only perform single rotation or simple load tests. This makes the test conditions highly consistent with the actual service state of the bearing, thereby significantly improving the accuracy and reliability of durability test results.

[0019] (2) It adopts an internal mechanical loading method, which is compact, efficient, energy-saving and safe.

[0020] This invention abandons the traditional method of connecting external loads such as friction discs and generators to the output end. Instead, it innovatively applies radial loads directly to the planetary gear shaft and transmits them to the bearing under test by tightening the loading bolts on the test gearbox. This internal loading method eliminates the need to consume a large amount of energy to overcome external loads, resulting in a more compact system structure and high energy efficiency. It is particularly suitable for long-term, high-power durability testing, while avoiding energy waste and potential safety hazards associated with handling generated electricity.

[0021] (3) It realizes comprehensive, real-time monitoring and intelligent judgment of bearing operating status.

[0022] This invention integrates a complete monitoring and control system, capable of synchronously and in real-time acquiring multi-dimensional parameters such as vibration, temperature, rotational speed, and motor current at key locations during testing. The host computer software can display, record, and analyze the data in real time, not only monitoring the operating status of the test bench itself but also effectively evaluating the performance and health status of the bearings based on characteristic parameters such as vibration intensity and temperature gradient. This provides direct and comprehensive data support for bearing reliability analysis, life prediction, and fault diagnosis.

[0023] (4) The system is highly automated, stable and reliable in operation, and suitable for long-term unattended testing.

[0024] From pre-lubrication, automatic start-stop, and speed control to closed-loop regulation of the oil temperature-based cooling system, the entire testing process is automatically controlled by a PLC and a host computer program, and is equipped with a comprehensive self-checking, interlocking, and fault alarm mechanism. Combined with forced oil injection lubrication and an oil temperature cooling system, this ensures the test bench can operate stably and reliably for extended periods under simulated harsh working conditions, meeting the requirements for automated, long-cycle durability testing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the test bench system of the present invention for realizing the mixed durability test of industrial bearing revolution and rotation.

[0026] Figure 2 This is a schematic diagram of the planetary gear train arrangement inside the test gearbox in this invention.

[0027] Figure 3 This is a cross-sectional view of the test gearbox used in this invention.

[0028] Reference numerals: 1-Base platform, 2-Test gearbox, 3-Belt drive component, 4-Servo motor, 5-Motor control cabinet, 6-Lubrication station, 7-Cooling system, 8-PLC electrical control cabinet, 9-Upper computer operation platform, 10-Distribution box, 11-Bearing to be tested; 201-Internal gear ring, 202-Central shaft pinion, 203-Planet pinion, 204-Planet gear shaft, 205-Loading bolt, 206-Housing, 207-Planet carrier, 208-Central shaft. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] like Figure 1 As shown, the test bench system provided by this invention for performing mixed revolution and rotation durability tests on industrial bearings mainly includes a test gearbox 2, a drive device, a loading device, a lubrication and cooling system, and a monitoring and control system. The test gearbox 2 contains a planetary gear train for mounting the bearing to be tested and providing it with a composite motion condition of simultaneous rotation and revolution. The drive device is connected to the input end of the test gearbox 2 via a belt drive component 3 and is used to drive the planetary gear train. The loading device is mounted on the test gearbox 2 and is used to apply a radial load to the bearing 11 to be tested mounted in the planetary gear train. The lubrication and cooling system is used to spray lubricating oil onto the contact area between the rollers and raceways of the bearing 11 to be tested and the gear meshing points within the test gearbox 2. The monitoring and control system is used to collect the state parameters of the test gearbox 2 during operation (such as vibration, temperature, and speed signals) and control the drive device, loading device, and lubrication and cooling system.

[0031] like Figure 2 and Figure 3As shown, the test gearbox 2 includes a housing 206, which is cylindrical. An internal gear ring 201 is coaxially disposed within the housing 206, providing internal meshing with a fixed outer envelope gear. A planetary carrier 207 is coaxially disposed within the internal gear ring 201, and the planetary carrier 207 is rotatably connected to the housing 206 via bearings. A central shaft 208 is coaxially disposed within the planetary carrier 207. One end of the central shaft 208 is rotatably connected to the housing 206, and the other end passes through the planetary carrier 207 and the housing 206, connecting to the output end of the belt drive component 3. The outer ring of the central shaft 208 is... A central shaft pinion 202 is fixed to the shaft and rotates synchronously with it. The central shaft pinion 202 is the high-speed input part. Three planetary gear sets mesh between the central shaft pinion 202 and the internal gear ring 201. Each planetary gear set includes a planetary pinion 203. The planetary pinion 203 meshes with the internal gear ring 201 and the central shaft pinion 202 respectively. A planetary gear shaft 204 is coaxially arranged inside the planetary pinion 203. The two ends of the planetary gear shaft 204 are located in the support holes of the planetary carrier 207 respectively. The bearing 11 to be tested is installed between the planetary gear shaft 204 and the planetary pinion 203.

[0032] The drive device includes a servo motor 4 and a motor control cabinet 5. The motor control cabinet 5 is electrically connected to the servo motor 4 and the PLC control cabinet 8. The output shaft of the servo motor 4 is connected to the input end of the belt drive component 3, and the output end of the belt drive component 3 is connected to the input shaft of the test gearbox 2. The PLC control cabinet 8 controls the start / stop, current, speed, and torque of the servo motor 4 through the motor control cabinet 5. The servo motor 4 drives the central shaft 208 and its outer ring central shaft pinion 202 to rotate synchronously through the belt drive component 3. Under the meshing action of the gears, it drives each planetary pinion 203 to rotate around its own axis and revolve around the central shaft pinion 202. The status signals of the servo motor 4, such as current magnitude, motor torque value, and motor speed value, can be parameterized by the motor control cabinet 5 and monitored and fed back to the PLC control cabinet 8 in real time.

[0033] The test gearbox 2, belt drive component 3, and servo motor 4 are all mounted on the base platform 1, forming an integrated mechanical transmission structure. The base platform 1 also houses a power distribution box 10 for supplying power to each component. The belt drive component 3 provides intermediate connection and start / stop buffering between the servo motor 4 and the test gearbox 2. The belt drive component 3 mainly includes a drive pulley, a driven pulley, and a belt. The drive pulley axle is connected to the output shaft of the servo motor 4 via a coupling, and the driven pulley axle is connected to the central shaft 208 via a coupling.

[0034] The loading device includes a loading bolt 205, which is mounted on the test gearbox 2 and connects the planetary gear shaft 204 and the planet carrier 207. The end of the loading bolt 205 passes vertically through the axis of the planetary gear shaft 204 and is located in the threaded hole of the planet carrier 207. By tightening the loading bolt 205, different pressures are applied to the planetary gear shaft 204, transferring the radial load to the bearing 11 under test, thus loading the bearing rollers and testing the durability performance of the bearing rollers and cage. An operation window is provided on the housing 206 of the test gearbox 2, through which the loading bolt 205 can be tightened onto the planetary gear shaft 204.

[0035] The lubrication and cooling system includes a lubrication station 6 and a cooling system 7. The lubrication station 6 is connected to the interior of the test gearbox 2 via an oil circuit, providing active circulating lubrication for the test gearbox 2 during operation. After being pressurized and filtered by the lubrication station 6, the lubricating oil is transported through oil pipelines to the oil spray pipe inside the test gearbox 2, directly spraying it onto the contact area between the rollers and raceways of the bearing 11 under test and the gear meshing points, ensuring sufficient lubrication for the bearing 11 under high-speed rotation and revolution. The cooling system 7 cools the lubricating oil in the lubrication station 6 to maintain a constant lubricating oil temperature. The cooling water passage of the cooling system 7 is connected to the heat exchanger inside the lubrication station 6, cooling the lubricating oil. The heated water circulates back to the cooling water system 7, maintaining a constant oil temperature and ensuring the long-term stable operation of the test bench system.

[0036] The monitoring and control system mainly includes a PLC control cabinet 8, a host computer operating console 9, and a sensor group.

[0037] The PLC control cabinet 8, acting as the underlying logic controller, is responsible for receiving instructions from the host computer console 9 and providing logic interlocking and start / stop control for each independent electrical system. Specific controlled objects include: the start / stop enable of the servo motor 4, the start / stop of the oil pump motor in the lubrication station 6, and the start / stop of the water pump and fan in the cooling system 7. Simultaneously, the PLC control cabinet 8 collects real-time signals from each sensor in the sensor group and the current, speed, and torque signals of the servo motor 4, performs preliminary filtering, and then transmits the data to the host computer console 9 via industrial Ethernet.

[0038] The host computer control console 9 includes overall test bench system control software, used for setting test parameters, real-time monitoring, displaying and storing test data, and fault alarms. The host computer control console 9 can display and record the real-time test status (including but not limited to: current / speed / torque of servo motor 4, vibration intensity of test gearbox, temperature gradient of the bearing under test, oil pressure / temperature of lubrication station, and inlet and outlet water temperature of cooling water).

[0039] The sensor group includes an oil temperature sensor, an oil pressure sensor, a cooling water temperature sensor, a vibration sensor, a speed sensor, and a gearbox temperature sensor. These sensors are used to collect the lubricating oil temperature in the lubrication station 6, the inlet and outlet water temperatures of the cooling system, and to test the vibration, temperature, and speed of the gearbox 1 in real time. The signal data collected in real time by these sensors are transmitted to the host computer control console 9 via the PLC control cabinet 8 for centralized processing and display.

[0040] Based on the above-mentioned test bench system, this invention also proposes a test method for realizing mixed durability testing of industrial bearings' revolution and rotation, comprising the following steps: S1. Installation and Loading: Install the bearing 11 to be tested in the planetary gear train of the test gearbox 1, and apply a preset radial load to the bearing 11 to be tested through the loading device.

[0041] Specifically, the bearing 11 to be tested is prepared and installed inside the test gearbox 1 between the planetary pinion 203 and the planetary gear shaft 204 to form a planetary gear set. After assembling all (e.g., 3 sets) of planetary gear sets, they are installed on the planet carrier 207 to form a complete planetary gear system. The other parts of the test gearbox 1 are still assembled as a single unit. Through the operation observation window on the housing 206, according to the loading force data under the experimental conditions, the loading bolts 205 on the test gearbox 1 are manually tightened. The bolt loading force is converted into the radial internal load of the bearing 11 to be tested through the planetary gear shaft 204, completing the tightening loading of the bearing to be tested. At the same time, various sensors and other hardware are installed at key test locations.

[0042] S2. System Start-up and Operation: Start the test bench system and drive the planetary gear train through the drive device, causing the bearing 11 under test to perform a combined rotation and revolution motion at a set speed. The specific process is as follows: S21 Start-up Phase (System Self-Test): PLC control cabinet 8 is powered on, and the system checks whether the signals of each sensor in the sensor group are normal, whether the oil level in the lubrication station is normal, and whether the water pressure in the cooling system is normal. After the self-test is passed, the "No Fault" indicator light on the host computer control panel 9 will illuminate.

[0043] S22 Pre-lubrication Stage: The oil pump of lubrication station 6 is started, and lubricating oil begins to force-lubricate the bearing 11 and gears to be tested in the test gearbox 1 for a preset duration (e.g., 60 seconds). When the oil pressure stabilizes and the temperature at all measuring points is close to the ambient temperature, it enters standby mode. During this stage, the monitoring and control system can control the operation of the cooling system based on the collected lubricating oil temperature signal to keep the lubricating oil temperature within the set range.

[0044] S23 Power Start-up and Speed ​​Adjustment Stage: The operator sets the target speed (rotation speed) and acceleration curve on the host computer control panel 9. The PLC control cabinet 8 controls the motor control cabinet 5 to drive the servo motor 4, which, through belt transmission, drives the central shaft pinion 202 (also known as the "sun gear") to slowly accelerate to the set speed. Under the meshing of the gears, the bearing 11 under test performs a compound motion of rotation and revolution at the set speed. During this process, the motor control cabinet 5 monitors the current of the servo motor 4 in real time and uploads it to the host computer control panel 9 via the PLC control cabinet 8 to prevent overload.

[0045] S3. Data Acquisition and Monitoring: After step S2, the system enters the long-term steady-state durability operation stage. During the durability test, the temperature, torque, current, vibration, and speed parameters are collected and recorded in real time by the monitoring and control system.

[0046] Specifically, the PLC control cabinet 8 collects lubricating oil temperature / pressure, cooling system inlet and outlet water temperatures, test gearbox temperature, servo motor torque, and servo motor current signals at a fixed frequency (e.g., 1Hz~10Hz), and transmits them to the host computer control panel 9 via industrial Ethernet. Simultaneously, the acquisition card within the PLC control cabinet 8 collects the rotational speed and vibration signals of the test gearbox 1 at a fixed frequency (e.g., 1Hz~25.6kHz), and transmits them to the host computer control panel 9 via industrial Ethernet.

[0047] S4. Status Judgment: Based on the data collected in step S3, determine the operating status of the test bench system and the performance status of the bearing to be tested.

[0048] If the current of the servo motor 4 or the vibration data of the test gearbox 1 exceeds the set threshold, the host computer control panel 9 will issue a warning. If the lubricating oil temperature exceeds the set range (e.g., >55℃), the cooling system will automatically adjust the cooling water flow to maintain a constant oil temperature. When the test reaches the set duration or a fault alarm occurs, the system will execute the shutdown logic: the servo motor 4 will decelerate and stop; the oil pump of the lubrication station 6 will enter the "post-lubrication" mode, and the servo motor 4 will continue to run for 3-5 minutes after stopping to remove residual heat from the bearing; the cooling system will be shut down. After shutdown, the condition of the bearing rollers and cage of the bearing under test can be observed through the operation observation window. The housing 206 and planetary gear set of the test gearbox will be disassembled, the bearing under test 11 will be disassembled, and the appearance of the bearing under test 11 will be observed for damage. A test report will be compiled to form a complete test.

[0049] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific functions and working processes described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these are within the protection scope of the present invention.

Claims

1. A test bench system for performing mixed durability testing of industrial bearings' revolution and rotation, characterized in that, include: The test gearbox contains a planetary gear train, which is used to install the bearing to be tested and provide it with a compound motion condition of simultaneous rotation and revolution. The drive unit is connected to the input end of the test gearbox via a belt drive component and is used to drive the planetary gear train to rotate. A loading device, disposed on the test gearbox, is used to apply a radial load to the bearing to be tested installed in the planetary gear train; The monitoring and control system is used to collect the status parameters of the test gearbox during operation and to control the drive device and loading device.

2. The test bench system for realizing mixed durability testing of industrial bearing revolution and rotation according to claim 1, characterized in that, The test gearbox (2) includes a housing (206), which is cylindrical. An internal gear ring (201) is coaxially arranged inside the housing (206). A planetary carrier (207) is coaxially arranged inside the internal gear ring (201). A central shaft (208) is coaxially arranged inside the planetary carrier (207). One end of the central shaft (208) is rotatably connected to the housing (206), and the other end is connected to the output end of the belt drive component (3). A central shaft pinion (202) is coaxially fixed on the outer ring of the central shaft (208). Three planetary gear sets mesh between the spindle pinion (202) and the internal gear ring (201). Each planetary gear set includes a planetary pinion (203), which meshes with the internal gear ring (201) and the spindle pinion (202). A planetary gear shaft (204) is coaxially arranged inside the planetary pinion (203). Both ends of the planetary gear shaft (204) are located in the support holes of the planet carrier (207). The bearing (11) to be tested is installed between the planetary gear shaft (204) and the planetary pinion (203).

3. The test bench system for realizing mixed durability testing of industrial bearing revolution and rotation according to claim 1, characterized in that, The drive device includes a servo motor (4) and a motor control cabinet (5). The motor control cabinet (5) is electrically connected to the servo motor (4) and the PLC control cabinet (8). The output shaft of the servo motor (4) is connected to the input end of the belt drive component (3). The output end of the belt drive component (3) is connected to the input shaft of the test gearbox (2). The PLC control cabinet (8) controls the start, stop, speed and torque of the servo motor (4) through the motor control cabinet (5). The servo motor (4) drives the central shaft (208) and the central shaft pinion (202) of its outer ring to rotate synchronously through the belt drive component (3). Under the meshing action of the gears, the planetary pinion (203) rotates around its own axis and revolves around the central shaft pinion (202). At the same time, the motor control cabinet (5) feeds back the status signal of the servo motor (4) to the PLC control cabinet (8).

4. The test bench system for realizing mixed durability testing of industrial bearing revolution and rotation according to claim 1, characterized in that, The loading device includes a loading bolt (205), which is mounted on the test gearbox (2) and is used to connect the planetary gear shaft (204) and the planet carrier (207). By tightening the loading bolt (205), pressure is applied to the planetary gear shaft (204) to transfer the radial load to the bearing (11) to be tested.

5. The test bench system for realizing mixed durability testing of industrial bearing revolution and rotation according to claim 1, characterized in that, The monitoring and control system includes a host computer operating console (9), a PLC control cabinet (8), and a sensor group. The host computer operating console (9) is used to set test parameters, monitor in real time, display and store test data, and provide fault alarms. The PLC control cabinet (8) is responsible for receiving instructions from the host computer operating console and controlling the enabling of the servo motor (4), the start and stop of the lubrication station (6) and the cooling system (7), and collecting signals from each sensor and the current and torque signals of the servo motor (4). The sensor group includes an oil temperature sensor, an oil pressure sensor, a cooling water temperature sensor, a vibration sensor, a speed sensor, and a gearbox temperature sensor, which are used to collect the lubricating oil temperature in the lubrication station (6), the inlet and outlet water temperatures of the cooling system, and the vibration, temperature, and speed of the gearbox (1) in real time. The signal data collected by these sensors in real time are transmitted to the host computer operating console (9) via the PLC control cabinet (8) for centralized processing and display.

6. The test bench system for realizing mixed durability testing of industrial bearing revolution and rotation according to claim 1, characterized in that, The system also includes a lubrication and cooling system, which includes a lubrication station (6) and a cooling system (7). The lubrication station (6) is connected to the inside of the test gearbox through an oil circuit and is used to spray lubricating oil into the contact area between the rollers and raceways and the gear meshing area of ​​the bearing (11) to be tested. The cooling system (7) is used to cool the lubricating oil in the lubrication station to maintain a constant lubricating oil temperature.

7. The test bench system for realizing mixed durability testing of industrial bearing revolution and rotation according to claim 1, characterized in that, The test gearbox (2), belt drive component (3), and servo motor (4) are all mounted on the base platform (1), and the base platform (1) is also equipped with a power distribution box (10) to supply power to each component.

8. A test method for performing mixed durability testing of industrial bearing revolution and rotation based on the test bench system according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Installation and loading: Install the bearing (11) to be tested in the planetary gear train of the test gearbox (1), and apply a preset radial load to the bearing (11) to be tested through the loading device; S2. System startup and operation: Start the test bench system and drive the planetary gear train to rotate through the drive device, so that the bearing to be tested (11) performs a compound motion of rotation and revolution at the set speed. S3. Data Acquisition and Monitoring: During the durability test, the temperature, torque, current, vibration, and speed parameters are collected and recorded in real time through the monitoring and control system. S4. Status Judgment: Based on the data collected in step S3, determine the operating status of the test bench system and the performance status of the bearing to be tested.

9. The test bench system for realizing mixed durability testing of industrial bearing revolution and rotation according to claim 8, characterized in that, In step S2, before starting the drive device, the lubrication station is started first to perform forced lubrication on the bearing and gear to be tested for a preset time; the monitoring and control system controls the operation of the cooling system according to the collected lubricating oil temperature signal so that the lubricating oil temperature is kept within the set range.

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