A bearing test bench and a bearing test method thereof

Abstract

The invention provides a bearing test bench, comprising a main test side device, a companion test side device, an axial loading device, a radial loading device and a control system; the main test side device comprises a main test shield body and a main test drive, and is designed with a main test bearing installation interface, the outer ring of the main test bearing is fixedly connected to the main test shield body, and the inner ring thereof is fixedly connected to the main test drive; the companion test side device comprises a companion test shield body and a companion test drive, and is designed with a companion test bearing installation interface, the outer ring of the companion test bearing is fixedly connected to the companion test shield body, and the inner ring thereof is fixedly connected to the companion test drive, and the inner ring of the companion test bearing is fixedly connected to the inner ring of the main test bearing through a connecting flange; the axial loading device is used for axially loading the main test bearing and the companion test bearing; the radial loading device is used for radially loading the main test bearing and the companion test bearing; the control system comprises a drive control system, a hydraulic control system, a PLC and a host computer, the drive control system is used for controlling the main test drive and the companion test drive, the hydraulic control system is used for controlling the axial loading device and the radial loading device, and the drive control system and the hydraulic control system are both connected to the host computer through the PLC.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing testing, and in particular to a bearing test bench and a bearing testing method thereof. Background Art

[0002] The bearing is a low-speed, heavy-duty bearing and a key component of a tunnel boring machine. Multiple motors are connected to the bearings through multiple reduction stages and gear ring meshing, and then drive the cutterhead to rotate to implement tunnel excavation operations. The performance of the bearing is crucial to the efficiency and safety of tunneling. The complex and changeable working conditions of the tunnel boring machine cause the bearing to often bear drastically changing loads during operation. Therefore, if the bearing can be tested under equivalent working load conditions, the reliability of the bearing can be improved and data support can be provided for bearing design.

[0003] The purpose of the bearing working condition simulation test bench is to simulate the different working conditions encountered by the tunnel boring machine in actual construction, obtain the bearing status under different working conditions, and evaluate the operating stability and reliability of the bearing.

[0004] There are many types and solutions of bearing test platforms, but bearing working condition simulation test platforms are relatively rare. At present, these bearing test platforms have the following main shortcomings:

[0005] 1) Most test benches are scaled-down or reduced-power test benches. They do not have high-power, flexible and adjustable test drives, cannot provide sufficient load, and cannot fully simulate actual working conditions.

[0006] 2) Only the main test side is similar to the bearing application of the tunnel boring machine, equipped with a shield, multi-stage reducer and drive motor, etc. Only one side can be fixed as the main test side and the other side as the companion test side. It is not possible to test two bearings on one test bench.

[0007] 3) Not considering energy feedback or using expensive four-quadrant inverters to achieve energy feedback.

[0008] 4) Taking the above problems into consideration, the tunnel boring machine working condition simulation test bench designed in the present invention can realize flexible and adjustable high-power loading load, dual-side switching function of main test and auxiliary test, and energy feedback and reuse of main test and auxiliary test drives through electrical control methods. Summary of the invention

[0009] The purpose of the present invention is to provide a bearing test bench to address the deficiencies in the prior art.

[0010] To achieve the above-mentioned object, the present invention provides a bearing test bench, comprising a main test side device, a companion test side device, an axial loading device, a radial loading device and a control system;

[0011] The main test side device comprises a main test shield and a main test drive, the main test shield is provided with a main test bearing mounting interface, the outer ring of the main test bearing is fixedly connected to the main test shield and the inner ring thereof is fixedly connected to the main test drive;

[0012] The accompanying test side device comprises an accompanying test shield and an accompanying test drive, the accompanying test shield is provided with an accompanying test bearing mounting interface, the outer ring of the accompanying test bearing is fixedly connected to the accompanying test shield and the inner ring thereof is fixedly connected to the accompanying test drive, and the inner ring of the accompanying test bearing is fixedly connected to the inner ring of the main test bearing through a connecting flange;

[0013] The axial loading device is used to load the main test bearing and the accompanying test bearing with axial force;

[0014] The radial loading device is used to load the main test bearing and the accompanying test bearing with radial force;

[0015] The control system includes a drive control system and a hydraulic control system, a PLC and a host computer. The drive control system is used to control the main test drive and the accompanying test drive. The hydraulic control system is used to control the axial loading device and the radial loading device. The drive control system and the hydraulic control system are both connected to the PLC, and the PLC is connected to the host computer.

[0016] Optionally, the drive control system includes a main test inverter and a companion test inverter, the main test inverter is used to control the main test drive and transmit signals with the PLC; the companion test inverter is used to control the companion test drive and transmit signals with the PLC; the main test inverter includes a main test inverter unit, and the main test inverter unit is used to control the main test drive; the companion test inverter includes a companion test inverter unit, and the companion test inverter unit is used to control the companion test drive; the main test inverter unit and the companion test inverter unit are connected to the rectifier unit using a common DC bus, and are connected to the power grid through the rectifier unit; the rectifier unit is used to convert the fixed-frequency AC power of the power grid into DC power.

[0017] Optionally, the main test frequency converter and the accompanying test frequency converter are both configured as two-quadrant frequency converters.

[0018] Optionally, the main test drive includes a main test motor and a main test motor encoder. The main test motor and the main test motor encoder are connected to the main test frequency converter using signals. The host computer controls the operation of the main test motor through PLC. The main test motor encoder feeds back the operating status of the main test motor to the main test inverter unit. The main test inverter unit automatically adjusts the motor parameters to form a main test closed-loop control system.

[0019] Optionally, the test drive includes a test motor and a test motor encoder. The test motor and the test motor encoder are connected to the test frequency converter using signals. The host computer controls the operation of the test motor through PLC. The test motor encoder feeds back the operation status of the test motor to the test inverter unit. The test inverter unit automatically adjusts the motor parameters to form a test closed-loop control system.

[0020] Optionally, the axial loading device includes a plurality of axial oil cylinders distributed along the circumferential direction, one end of each of the plurality of axial oil cylinders is hinged to the main test shield body and the other end of each of the plurality of axial oil cylinders is hinged to the companion test shield body.

[0021] Optionally, the radial loading device includes a plurality of radial oil cylinders distributed in a horizontal direction, and one end of each of the plurality of radial oil cylinders is hinged to the test shield body.

[0022] Optionally, the hydraulic control system includes a plurality of first proportional pressure reducing valves and first pressure sensors arranged in a one-to-one correspondence with the axial cylinder, and a plurality of second proportional pressure reducing valves and second pressure sensors arranged in a one-to-one correspondence with the radial cylinder, the first pressure sensor being used to detect the internal pressure of the axial cylinder, and the first proportional pressure reducing valve being used to control the oil pressure in the axial cylinder according to the data detected by the first pressure sensor; the second pressure sensor being used to detect the internal pressure of the radial cylinder, and the second proportional pressure reducing valve being used to control the oil pressure in the radial cylinder according to the data detected by the second pressure sensor.

[0023] The method of using the above-mentioned bearing test bench to conduct a working condition simulation type test on a large-diameter heavy-load bearing is as follows:

[0024] Step 1: Determine the total time of the type test: Calculate the operating time of each working condition according to the time proportion of each working condition in the bearing design load spectrum;

[0025] Step 2: Calculate the axial and radial cylinder loading forces under each working condition according to the test bench structure;

[0026] Step 3: Adjust the axial and radial oil cylinders to the required value of working condition 1, start the main test side drive system, slowly increase the bearing speed to the required value of working condition 1, apply the reverse torque through the companion test side motor to reach the required value of working condition 1, and then run continuously to reach the required running time of working condition 1;

[0027] Step 4: Complete the operation of all working conditions in sequence according to step 3. During the operation, pay attention to whether the control system signal is abnormal;

[0028] Step 5: Disassemble the main test bearing and check whether there are any abnormalities in the rolling elements, raceways and other parts to verify whether the bearing performance meets the design requirements.

[0029] The method of using the above-mentioned bearing test bench to conduct working condition simulation accelerated fatigue life test on large diameter heavy-load bearings is as follows:

[0030] Step 1: Calculate the axial force, radial force, overturning moment, torque, speed and equivalent acceleration time of the bearing under accelerated working condition according to the bearing design load spectrum and design life, and verify the rationality of the accelerated test working condition load through engineering calculation and simulation analysis, that is, the failure mode of the bearing does not change under accelerated load conditions;

[0031] Step 2, calculate the axial and radial loading forces of the cylinder under acceleration conditions;

[0032] Step 3: Adjust the axial and radial oil cylinders to reach the required value of the acceleration condition, start the main test side drive system, slowly increase the bearing speed to the required value of the acceleration condition, apply the reverse torque through the companion test side motor to reach the required value of the acceleration condition, and then run continuously to reach the equivalent acceleration time;

[0033] Step 4: During the operation of the test bench, pay attention to whether the control system signal is abnormal;

[0034] Step 5: After the accelerated fatigue test is completed, disassemble the main test bearing, check the fatigue failure of the bearing, determine whether the bearing meets the design life requirements, and evaluate the actual service life of the bearing.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] A bearing test bench provided by the present invention is provided with a main test device, a companion test device, an axial loading device, and a radial loading device. An axial load, a radial load, an overturning moment, and a load torque are applied to the bearing during the test to detect and analyze performance parameters such as vibration and noise of the bearing, thereby realizing bearing status monitoring and performance evaluation.

[0037] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0039] Figure 1 is a structural schematic diagram of a bearing test bench in an embodiment of the present invention;

[0040] Figure 2 yes Figure 1 Schematic diagram of the control system framework (→ in the figure indicates the direction of signal transmission);

[0041] Figure 3 yes Figure 1 The drive control system connection diagram in the figure (→ in the figure indicates the frame connection direction of the drive control system, Indicates the direction of power transmission).

[0042] in:

[0043] 1. Main test shield, 2. Main test drive, 3. Accompanying test shield, 4. Accompanying test drive, 5. Axial loading device, 6. Radial loading device. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present invention more clear and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be noted that the drawings of the present invention are all simplified and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the implementation of the present invention; the "number" mentioned in the present invention is not limited to the specific number in the examples in the accompanying drawings; the directions or positional relationships indicated by "front", "middle", "back", "left", "right", "up", "down", "top", "bottom", "middle", etc. mentioned in the present invention are based on the directions or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction, nor can they be understood as limitations on the present invention.

[0045] The present embodiment:

[0046] See also Figures 1 to 3 As shown, a bearing test bench includes a main test side device, a companion test side device, an axial loading device 5, a radial loading device 6 and a control system; the main test side device includes a main test shield 1, a main test bearing and a main test drive 2, the outer ring of the main test bearing is fixedly connected to the main test shield 1, and the inner ring of the main test bearing is fixedly connected to the main test drive 2; the companion test side device includes a companion test shield 3, a companion test bearing and a companion test drive 4, the outer ring of the companion test bearing is fixedly connected to the companion test shield 3, the inner ring of the companion test bearing is fixedly connected to the companion test drive 4, and the inner ring of the companion test bearing is connected to the main test through a connecting flange. The inner ring of the bearing is fixedly connected; the axial loading device 5 is used to load the main test bearing and the accompanying test bearing with axial force; the radial loading device 6 is used to load the main test bearing and the accompanying test bearing with radial force; the control system includes a drive control system, a hydraulic control system, a PLC and a host computer, the drive control system is used to control the main test drive 2 and the accompanying test drive 4, the hydraulic control system is used to control the axial loading device 5 and the radial loading device 6, and the drive control system and the hydraulic control system are both connected to the PLC, and the PLC is connected to the host computer. It is preferred here that: the main test shield body 1 and the accompanying test shield body 3 are both installed on the mounting base, so as to realize the connection between the main test shield body 1 and the accompanying test shield body 3.

[0047] Optionally, the main test drive 2 includes a main test motor and a main test motor encoder, the main test motor is used to drive the main test bearing, and the main test motor and the main test motor encoder are connected to the main test frequency converter by signals, the host computer controls the operation of the main test motor through the PLC, and the main test motor encoder feeds back the operation of the main test motor to the main test inverter unit, and the main test inverter unit automatically adjusts the motor parameters to form a main test closed-loop control system. Preferably here: the main test motor can be set as one group or more according to demand, the main test motor encoder and the main test motor are set in a one-to-one correspondence, and each group of main test motors and main test motor encoders are respectively connected to the main test frequency converter to form a single group of main test closed-loop control system; the main test motor is preferably set as a drive motor; the main test frequency converter is set as a two-quadrant frequency converter.

[0048] Optionally, the accompanying test drive 3 includes an accompanying test motor and an accompanying test motor encoder, the accompanying test motor is used to drive the accompanying test bearing, and the accompanying test motor and the accompanying test motor encoder are connected to the accompanying test frequency converter using signals, the host computer controls the operation of the accompanying test motor through the PLC, and the accompanying test motor encoder feeds back the operation of the accompanying test motor to the accompanying test inverter unit, and the accompanying test inverter unit automatically adjusts the motor parameters to form an accompanying test closed-loop control system. Preferably here: the accompanying test motor can be set as one group or more according to demand, the accompanying test motor encoder and the accompanying test motor are set in a one-to-one correspondence, and each group of accompanying test motors and accompanying test motor encoders are respectively connected to the accompanying test frequency converter to form a single group of accompanying test closed-loop control system; the accompanying test motor is preferably set as a drive motor; the accompanying test frequency converter is set as a two-quadrant frequency converter.

[0049] In addition to the above structure, in order to reduce the consumption of electric energy, the main test motor or the accompanying test motor can also be set as a generator, using one end to drive the other end to generate electricity according to its driving power, so as to reduce the consumption of electric energy. Here preferably: in order to realize that the main test drive and the accompanying test drive can be replaced with each other as the drive end, the main test drive and the accompanying test drive are connected to the power grid by using a common DC bus.

[0050] Optionally, the drive control system includes a main test frequency converter and a companion test frequency converter, the main test frequency converter includes a main test inverter unit, the main test inverter unit is connected to the main test motor and PLC by signals, the host computer sends a control signal to the main test inverter unit through the PLC, the main test inverter unit transmits the control signal to the main test motor, thereby realizing control of the main test motor, and at the same time, the main test motor encoder feeds back the operating status of the main test motor to the main test inverter unit, the main test inverter unit automatically adjusts the motor parameters to achieve high-precision closed-loop control; the companion test frequency converter includes a companion test inverter unit, the companion test inverter unit is connected to the companion test motor and PLC by signals, the host computer sends a control signal to the companion test inverter unit through the PLC, the companion test inverter unit transmits the control signal to the companion test motor, thereby realizing control of the companion test motor, and at the same time, the companion test motor encoder feeds back the operating status of the companion test motor to the companion test inverter unit, the companion test inverter unit automatically adjusts the motor parameters to achieve high-precision closed-loop control. Preferably here: in order to realize the mutual replacement of the main test device and the accompanying test device, the main test inverter unit and the accompanying test inverter unit are connected to the rectifier unit using a common DC bus, and are connected to the power grid through the rectifier unit; the rectifier unit is used to convert the fixed-frequency AC power of the power grid into DC power; when the electric energy output by the power grid drives the main test motor, the accompanying test motor generates electricity as a generator and transmits the electric energy to the main test motor through the DC bus, thereby providing part of the electric energy for the main test motor; when the electric energy output by the power grid drives the accompanying test motor, the main test motor generates electricity as a generator and transmits the electric energy to the accompanying test motor through the DC bus, thereby providing part of the electric energy for the accompanying test motor.

[0051] Optionally, the main test inverter unit and the main test driver 2 are arranged in a one-to-one correspondence, and the accompanying test inverter unit and the accompanying test driver 4 are arranged in a one-to-one correspondence.

[0052] Optionally, the axial loading device includes a plurality of axial oil cylinders distributed along the circumferential direction, one end of each of the plurality of axial oil cylinders is hinged to the main test shield body and the other end of each of the plurality of axial oil cylinders is hinged to the companion test shield body.

[0053] Optionally, the radial loading device includes a plurality of radial oil cylinders distributed in a horizontal direction, and one end of each of the plurality of radial oil cylinders is hinged to the test shield body.

[0054] Optionally, the hydraulic control system includes a plurality of first proportional pressure reducing valves and first pressure sensors arranged in a one-to-one correspondence with the axial cylinder, and a plurality of second proportional pressure reducing valves and second pressure sensors arranged in a one-to-one correspondence with the radial cylinder, the first pressure sensor being used to detect the internal pressure of the axial cylinder, and the first proportional pressure reducing valve being used to control the oil pressure in the axial cylinder according to the data detected by the first pressure sensor; the second pressure sensor being used to detect the internal pressure of the radial cylinder, and the second proportional pressure reducing valve being used to control the oil pressure in the radial cylinder according to the data detected by the second pressure sensor.

[0055] In addition to the above-mentioned structures, the parts not mentioned in the driving control system and the hydraulic control system can refer to the prior art.

[0056] In addition to the above structure, a bearing test bench provided by the present invention further includes a host computer. The PLC is connected to the host computer by communication. The host computer is used to store and display various data of the PLC and send instructions to the PLC.

[0057] The method for testing the performance of the bearing using the above-mentioned bearing test bench is as follows:

[0058] 1) No-load test: The axial cylinder is not loaded, and the radial cylinder loading force offsets the gravity of the accompanying test device. The main test device is started without load, and the starting friction torque of the bearing is detected to observe whether the bearing is stuck or has abnormal noise;

[0059] 2) Single load test: According to the bearing load spectrum, the bearing is allowed to run stably at the design speed, and a single load is applied. Tests are performed at 20%, 40%, 60%, 80% and 100% of the design full load, respectively, to obtain the overturning moment-time curve, load torque-time curve, load torque-overturning moment change curve, etc.;

[0060] 3) Comprehensive load test: According to the bearing load spectrum, the bearing is allowed to run stably at the design speed, and axial force, radial force, and load torque are applied at the same time to conduct tests, and obtain the overturning moment-time curve, load torque-time curve, load torque-overturning moment change curve, etc.

[0061] 4) Fatigue test: According to the bearing fatigue load spectrum, make the bearing run stably at the design speed, and perform fatigue test according to the design fatigue load. After running for the design time, disassemble the test bearing for inspection.

[0062] The method of using the above-mentioned bearing test bench to conduct a working condition simulation type test on a large-diameter heavy-load bearing is as follows:

[0063] Step 1: Determine the total time of the type test, and calculate the operating time of each working condition according to the time proportion of each working condition in the bearing design load spectrum;

[0064] Step 2: Calculate the axial and radial cylinder loading forces under each working condition according to the test bench structure;

[0065] Step 3: Adjust the axial and radial oil cylinders to the required value of working condition 1 through the upper computer control panel, start the main test side drive system, slowly increase the bearing speed to the required value of working condition 1, apply the reverse torque through the companion test side motor to reach the required value of working condition 1, and then run continuously to reach the required running time of working condition 1;

[0066] Step 4: Complete the operation of all working conditions in sequence according to step 3. During the operation, pay attention to whether the control system signal is abnormal;

[0067] Step 5: Disassemble the main test bearing and check whether there are any abnormalities in the rolling elements, raceways and other parts to verify whether the bearing performance meets the design requirements.

[0068] The method of using the above-mentioned bearing test bench to conduct working condition simulation accelerated fatigue life test on large diameter heavy-load bearings is as follows:

[0069] Step 1: Calculate the axial force, radial force, overturning moment, torque, speed and equivalent acceleration time of the bearing under accelerated working condition according to the bearing design load spectrum and design life, and verify the rationality of the accelerated test working condition load through engineering calculation and simulation analysis, that is, the failure mode of the bearing does not change under accelerated load conditions;

[0070] Step 2: Calculate the axial and radial loading forces of the cylinders under acceleration conditions according to the test bench structure;

[0071] Step 3: Adjust the axial and radial oil cylinders to the required value of the acceleration condition through the upper computer control panel, start the main test side drive system, slowly increase the bearing speed to the required value of the acceleration condition, apply the reverse torque through the companion test side motor to reach the required value of the acceleration condition, and then run continuously to reach the equivalent acceleration time;

[0072] Step 4: During the operation of the test bench, pay attention to whether the control system signal is abnormal;

[0073] Step 5: After the accelerated fatigue test is completed, disassemble the main test bearing, check the fatigue failure of the bearing, determine whether the bearing meets the design life requirements, and evaluate the actual service life of the bearing.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bearing test bench, It is characterized in that It includes a main test side device, a companion test side device, an axial loading device, a radial loading device and a control system; The main test side device comprises a main test shield and a main test drive, the main test shield is provided with a main test bearing mounting interface, the outer ring of the main test bearing is fixedly connected to the main test shield and the inner ring thereof is fixedly connected to the main test drive; The accompanying test side device comprises an accompanying test shield and an accompanying test drive, the accompanying test shield is provided with an accompanying test bearing mounting interface, the outer ring of the accompanying test bearing is fixedly connected to the accompanying test shield and the inner ring thereof is fixedly connected to the accompanying test drive, and the inner ring of the accompanying test bearing is fixedly connected to the inner ring of the main test bearing through a connecting flange; The axial loading device is used to load the main test bearing and the accompanying test bearing with axial force; The radial loading device is used to load the main test bearing and the accompanying test bearing with radial force; The control system includes a drive control system and a hydraulic control system, a PLC and a host computer, wherein the drive control system is used to control the main test drive and the accompanying test drive, and the hydraulic control system is used to control the axial loading device and the radial loading device, and the drive control system and the hydraulic control system are both connected to the PLC, and the PLC is connected to the host computer; The specific steps for conducting working condition simulation performance tests on large diameter heavy-load bearings are as follows: Step 1: Determine the total test time: Calculate the operating time of each working condition based on the time proportion of each working condition in the bearing design load spectrum; Step 2: Calculate the axial and radial cylinder loading forces under each working condition according to the test bench structure; Step 3: Adjust the axial and radial oil cylinders to the required value of working condition 1, start the main test side drive system, slowly increase the bearing speed to the required value of working condition 1, apply the reverse torque through the companion test side motor to reach the required value of working condition 1, and then run continuously to reach the required running time of working condition 1; Step 4: Complete the operation of all working conditions in sequence according to step 3. During the operation, pay attention to whether the control system signal is abnormal; Step 5: Disassemble the main test bearing and check whether there are any abnormalities in the rolling elements and raceways to verify whether the bearing performance meets the design requirements; The specific steps for conducting working condition simulation accelerated fatigue life test on large diameter heavy-load bearings are as follows: Step 1) Calculate the axial force, radial force, overturning moment, torque, speed and equivalent acceleration time of the bearing under accelerated working condition according to the bearing design load spectrum and design life, and verify the rationality of the accelerated test working condition load through engineering calculation and simulation analysis, that is, the failure mode of the bearing does not change under accelerated load conditions; Step 2), calculate the axial and radial loading forces of the cylinder under acceleration conditions; Step 3) adjust the axial and radial oil cylinders to reach the required value of the acceleration condition, start the main test side drive system, slowly increase the bearing speed to the required value of the acceleration condition, apply the reverse torque through the accompanying test side motor to reach the required value of the acceleration condition, and then run continuously to reach the equivalent acceleration time; Step 4) During the operation of the test bench, pay attention to whether the control system signal is abnormal; Step 5) After the accelerated fatigue test is completed, the main test bearing is disassembled to check the fatigue failure of the bearing, determine whether the bearing meets the design life requirements, and evaluate the actual service life of the bearing.

2. The bearing test bench according to claim 1, It is characterized in that The drive control system includes a main test inverter and a companion test inverter, wherein the main test inverter is used to control the main test drive and transmit signals to and from the PLC; the companion test inverter is used to control the companion test drive and transmit signals to and from the PLC; The main test frequency converter comprises a main test inverter unit, and the main test inverter unit is used to control the main test drive; The accompanying test frequency converter comprises an accompanying test inverter unit, and the accompanying test inverter unit is used to control the accompanying test drive; The main test inverter unit and the accompanying test inverter unit are connected to the rectifier unit using a common DC bus, and are connected to the power grid through the rectifier unit; the rectifier unit is used to convert the fixed-frequency AC power of the power grid into DC power.

3. The bearing test bench according to claim 2, It is characterized in that The main test frequency converter and the accompanying test frequency converter are both configured as two-quadrant frequency converters.

4. The bearing test bench according to claim 3, It is characterized in that The main test drive includes a main test motor and a main test motor encoder. The main test motor and the main test motor encoder are connected to the main test inverter signal. The host computer controls the operation of the main test motor through the PLC. The main test motor encoder feeds back the operation status of the main test motor to the main test inverter unit. The main test inverter unit automatically adjusts the motor parameters to form a main test closed-loop control system.

5. The bearing test bench according to claim 3, It is characterized in that The accompanying test drive includes an accompanying test motor and an accompanying test motor encoder. The accompanying test motor and the accompanying test motor encoder are connected to the accompanying test frequency converter signal. The host computer controls the operation of the accompanying test motor through the PLC. The accompanying test motor encoder feeds back the operation status of the accompanying test motor to the accompanying test inverter unit. The accompanying test inverter unit automatically adjusts the motor parameters to form an accompanying test closed-loop control system.

6. The bearing test bench according to claim 1, It is characterized in that The axial loading device comprises a plurality of axial oil cylinders distributed along the circumferential direction, one end of each of the plurality of axial oil cylinders is hinged to the main test shield and the other end is hinged to the companion test shield; The radial loading device comprises a plurality of radial oil cylinders distributed in the horizontal direction, and one end of each of the plurality of radial oil cylinders is hinged to the test shield body.

7. The bearing test bench according to claim 6, It is characterized in that The hydraulic control system includes a plurality of first proportional pressure reducing valves and a first pressure sensor arranged in a one-to-one correspondence with the axial oil cylinder, and a plurality of second proportional pressure reducing valves and a second pressure sensor arranged in a one-to-one correspondence with the radial oil cylinder. The first pressure sensor is used to detect the internal pressure of the axial oil cylinder, and the first proportional pressure reducing valve is used to control the oil pressure in the axial oil cylinder according to the data detected by the first pressure sensor; the second pressure sensor is used to detect the internal pressure of the radial oil cylinder, and the second proportional pressure reducing valve is used to control the oil pressure in the radial oil cylinder according to the data detected by the second pressure sensor.

Images