Testing device and testing method for testing durability of electric drive assembly of electric forklift

Abstract

The invention discloses a testing device for testing the durability of an electric drive assembly of an electric forklift, and the device comprises an installation assembly which forms an installation surface. The test assemblies are symmetrically arranged at the two ends of the output shaft of the electric drive assembly, and the test assemblies can limit the rotating speed of the output shaft of the electric drive assembly at a wheel side rotating speed set value; and the control system can control the wheel edge rotating speed and the torque of the electric drive assembly and compare the running condition of the electric drive assembly with the rated running condition of the electric drive assembly in real time. The display screen is arranged to control and monitor the wheel edge rotating speed of the test motor and the torque of the electric drive assembly in real time, so that the wheel edge rotating speed and the torque of the synchronous motor of the electric drive assembly can be accurately stabilized at set values, and the operation condition of the electric drive assembly under the international working condition can be tested by continuously operating for 200 hours; accurate temperature, voltage and current equivalents under international working conditions are further obtained and compared with rated values, and the accuracy of a durability test experiment is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric forklifts, and in particular to a testing device and a testing method for testing the durability of an electric drive assembly of an electric forklift. Background Art

[0002] The electric drive assembly of an electric forklift includes a synchronous motor, a reducer and a motor controller. Its performance and reliability need to be tested on a dynamometer during the development process. Most companies will give priority to performance testing and verification on a dynamometer during the verification and development stage to identify problems as early as possible, modify the solution and then test again. Bench testing is mainly divided into two categories: performance testing and durability testing. Durability testing generally uses a dynamometer to conduct working condition durability testing.

[0003] For example, the invention patent application CN117233508A discloses an electric drive assembly support test system, wherein the system includes a gearbox group, a battery simulator and a torque sensor group, wherein the gearbox group is configured to transmit the mechanical energy of two electric drive assemblies to be tested, and the gearbox group includes two gearboxes, and two electric drive assemblies to be tested are arranged between the two gearboxes to form a mechanical energy closed loop. The battery simulator is configured to input or output electrical energy to the two electric drive assemblies to be tested to form an electrical energy closed loop. The torque sensor group is configured to measure the output torque of the left and right half shafts of the two electric drive assemblies to be tested, so as to calculate the output power. This invention patent selects one of the electric drive assemblies to be tested as a companion test piece to simulate the wheel-end load of the car. Since the operation of the electric drive assembly to be tested has not been tested, there is a lack of accurate wheel speed and torque for reference during the test process, which makes the wheel-end load inaccurate, and thus the test results are inaccurate. Summary of the invention

[0004] The present invention provides an accurate wheel speed and torque to simulate the actual wheel end load condition and then test the durability of the electric drive assembly of an electric forklift under actual working conditions. A test device and a test method for testing the durability of the electric drive assembly of an electric forklift are provided. The specific technical scheme is as follows:

[0005] A test device for testing the durability of an electric drive assembly of an electric forklift, comprising: a mounting assembly, the mounting assembly forming a mounting surface for mounting the electric drive assembly; a test assembly arranged on the mounting surface, the test assembly being symmetrically arranged at both ends of an output shaft of the electric drive assembly, the test assembly being capable of limiting the rotational speed of the output shaft of the electric drive assembly to a wheel side rotational speed setting value; and a control system connected to the test assembly and the electric drive assembly, the control system being capable of controlling the wheel side rotational speed and torque of the electric drive assembly and comparing the operating condition of the electric drive assembly with the rated operating condition of the electric drive assembly in real time.

[0006] Preferably, the test assembly includes: a test motor arranged on the mounting surface, the test motor being a permanent magnet synchronous motor; and a test electronic control system arranged on the test motor, the electronic control system controlling the wheel speed of the test motor according to a signal output by the control system.

[0007] Preferably, the control system includes: a display screen connected to the test electronic control and the electric drive assembly via a CAN bus; and a discharge cabinet electrically connected to the test motor and the electric drive assembly, the discharge cabinet being capable of inputting alternating current and direct current, and outputting direct current for driving the test component and the electric drive assembly.

[0008] Preferably, the mounting assembly includes: a mounting platform, the horizontal top surface of which is the mounting surface; a mounting bracket arranged on the mounting surface, the mounting bracket forming a cavity for mounting the electric drive assembly; a transmission half-shaft symmetrically arranged on the mounting bracket with the output shaft of the electric drive assembly as the center, one end of the transmission half-shaft being connected to the output shaft of the electric drive assembly, and the transmission half-shaft being connected to the mounting bracket in a detachable manner; and a transmission shaft for transmitting torque, one end of the transmission shaft being connected to the transmission half-shaft, and the other end of the transmission shaft being connected to the test assembly.

[0009] Preferably, the mounting platform forms a movable groove along the axial direction of the transmission axis, and the test component can move along the movable groove relative to the electric drive assembly.

[0010] The test method includes: S1: setting the torque of the electric drive assembly and the wheel speed change curve of the test motor and the running time according to the national standard working conditions; S2: connecting the output shaft, transmission half shaft, transmission shaft and test motor of the electric drive assembly in sequence; S3: the control system controls the discharge cabinet, test electronic control and motor controller of the electric drive assembly, and the display screen monitors the operating status of the test motor and the electric drive assembly in real time. When the operating status of the electric drive assembly exceeds the rated value, the control system will sound an alarm, and the running time will be counted at the end of the test.

[0011] Preferably, in S1, the international working conditions mainly include indoor warehousing operations with medium wheel speed and medium torque, outdoor handling operations with low wheel speed and high torque, and heavy-load handling operations with low wheel speed and ultra-high torque.

[0012] Preferably, in S3, the current flow direction of the discharge cabinet is: the discharge cabinet transmits DC power and AC power to the electric drive assembly and the test component respectively, and the test motor rotates to generate AC power which is converted into DC power by the test electronic control and input into the discharge cabinet to realize energy recovery.

[0013] Preferably, in S3, the operating status of the electric drive assembly is fed back to the display screen through the motor controller, and the display screen compares various values ​​of the operating status with various values ​​of the normal status in real time until the values ​​exceed an alarm and the test experiment is terminated, wherein the operating status includes: voltage, current, temperature, chip power supply voltage and communication interruption time.

[0014] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0015] The present invention sets a display screen to control and monitor in real time the wheel speed of the test motor and the torque of the electric drive assembly, so that the wheel speed and torque of the synchronous motor of the electric drive assembly can be accurately stabilized at the set value, and then the operating condition of the electric drive assembly under the international working condition is tested by running continuously for 200 hours, and then the precise temperature, voltage, current and other values ​​under the international working condition are obtained, and compared with the rated values, so as to improve the accuracy of the test durability experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of Embodiment 1 of the present invention;

[0017] Figure 2 It is a partial structural schematic diagram of an embodiment of the installation assembly of the present invention;

[0018] Figure 3 A flow chart of the vector control method for testing the electric control test motor;

[0019] Figure 4 This is a flow chart of Embodiment 2 of the present invention.

[0020] In the figure: 1. Installation component; 2. Test component; 3. Control system; 11. Installation platform; 12. Installation bracket; 13. Transmission half axis; 14. Transmission axis; 15. Moving groove; 21. Test motor; 22. Test electronic control; 31. Display screen; 32. Discharge cabinet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention 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 a limitation on the present invention.

[0023] Embodiment 1

[0024] like Figure 1 and Figure 2As shown, the present invention is a test device for testing the durability of an electric drive assembly of an electric forklift, comprising: a mounting component 1, which forms a mounting surface for mounting the electric drive assembly, and the mounting component 1 comprises: a mounting platform 11, the top surface of which is a horizontal mounting surface; a mounting bracket 12 arranged on the mounting surface, the mounting bracket 12 forming a cavity for mounting the electric drive assembly; a transmission half-shaft 13 symmetrically arranged on the mounting bracket 12 with the output shaft of the electric drive assembly as the center, one end of the transmission half-shaft 13 is connected to the output shaft of the electric drive assembly, and the transmission half-shaft 13 is detachably connected to the mounting bracket 12; and a transmission shaft 14 for transmitting torque, one end of the transmission shaft 14 is connected to the transmission half-shaft 13, and the other end of the transmission shaft 14 is connected to the test component 2.

[0025] Specifically, the top surface of the mounting platform 11 is a horizontal plane, so that when the electric drive assembly drives the transmission half-shaft 13 and the transmission shaft 14 to rotate, it will not be affected by the gravity component of the two, thereby affecting the torque actually output by the electric drive assembly, thereby being able to simulate the road surface when the electric forklift is actually running; the middle part of the mounting bracket 12 is a shell with an open end, and its open end is connected to the electric drive assembly by bolts, and the left and right parts of the mounting bracket 12 are equipped with bearings for fixing the transmission half-shaft 13, so that the position of the electric drive assembly and the transmission half-shaft 13 is relatively fixed, so that the connection position of the output shaft of the electric drive assembly and the input end of the transmission half-shaft 13 can be kept relatively fixed, and then the electric drive assembly can stably transmit torque to the transmission half-shaft 13, wherein the left and right parts are symmetrical about the middle part, respectively, so that the transmission half-shaft 13 is symmetrically fixed about the electric drive assembly, and then the torque output by the electric drive assembly to the transmission half-shaft 13 on both sides is the same, thereby being able to simulate the driving condition of the electric drive assembly on the tires on both sides when the electric forklift is actually running.

[0026] Among them, in this embodiment, one end of the transmission half shaft 13 forms a tooth groove for forming a gear transmission with the electric drive assembly, and the bearing mounting seat for fixing the transmission half shaft 13 is connected to the mounting seat of the bearing mounting seat by bolts, so that the connection between the transmission half shaft and the electric drive assembly remains stable, and the transmission half shaft 13 can be separated from the mounting bracket 12 at any time by disassembling the bearing mounting seat, so as to replace the transmission half shaft 13 of different lengths, and then test the durability of the electric drive assembly of electric forklifts of different sizes; secondly, universal joints are provided at both ends of the transmission shaft 14 (common technology, not shown in the figure), and the universal joints at both ends are respectively connected to the transmission half shaft 13 and the test assembly 2 by bolts, so that the torque of the electric drive assembly can be transmitted to the test assembly 2 without loss.

[0027] Furthermore, the mounting platform 11 forms a moving groove 15 along the axial direction of the transmission shaft 14 , and the test component 2 can move along the moving groove 15 relative to the electric drive assembly.

[0028] Specifically, the test component 2 is slidably connected to the movable groove 15, so that the test component 2 can adjust its distance from the electric drive assembly at any time, and then adjust the distance between the two according to the electric drive assemblies and electric forklifts of different sizes, so as to achieve real size and obtain real operation test data, wherein the length direction of the movable groove 15 is the direction of torque transmission of the electric drive assembly, so that when the test component 2 moves along the movable groove 15, the torque transmission direction will not change, and no loss will occur, thereby simulating the real working condition.

[0029] Furthermore, the present invention also includes a test component 2 arranged on the mounting surface, which is symmetrically arranged at both ends of the output shaft of the electric drive assembly, and the test component 2 can limit the rotational speed of the output shaft of the electric drive assembly to a wheel-side rotational speed setting value; and a control system 3 connected to the test component 2 and the electric drive assembly, which can control the rotational speed and torque of the test component 2 and the electric drive assembly respectively and compare the operating condition of the electric drive assembly with the rated operating condition of the electric drive assembly in real time.

[0030] Specifically, the torque output by the electric drive assembly is transmitted to the left and right sides at the same time, and is transmitted to the test component 2 through the transmission half shaft 13 and the transmission shaft 14. The test component 2 starts to rotate under the drive of the torque. At this time, the test component 2 is a driven part. At the same time, the control system 3 sends an operation signal to the test component 2 to control its rotation, and then outputs the wheel speed. The test components 2 on the left and right sides both output the wheel speed to the electric drive assembly through the transmission shaft 14 and the transmission half shaft 13, thereby limiting the wheel speed of the electric drive assembly to achieve the required operating conditions, thereby simulating the actual operating conditions of the electric drive assembly. At the same time, the test component 2 sends a signal to the control system 3 A feedback signal of the wheel speed is sent out, and the control system 3 adjusts the operating signal through the feedback signal to accurately control the wheel speed of the test component 2, and then controls the wheel speed of the electric drive assembly. At the same time, the electric drive assembly has rated values ​​for the operating conditions during production, such as maximum voltage, maximum current, etc. The control system 3 compares the real-time monitored operating conditions of the electric drive assembly with the rated values ​​to determine whether the electric drive assembly is working under rated working conditions and whether the operation is normal. When the rated value is exceeded, the control system 3 can determine that the electric drive assembly is working abnormally, and then issue an alarm to terminate the rotation of the test component 2 and the electric drive assembly.

[0031] Furthermore, the test component 2 includes: a test motor 21 arranged on the mounting surface, which is a permanent magnet synchronous motor; and a test electronic control 22 arranged on the test motor 21, which controls the wheel speed of the test motor 21 according to the signal output by the control system 3.

[0032] Specifically, the control method of the test electronic control 22 is vector control. Figure 3As shown, vector control is to decompose the stator current of the test motor 21 into two mutually perpendicular components: the excitation component and the torque component. It realizes precise control of the wheel speed of the test motor 21 by controlling the two components respectively. The specific implementation process is to use Park transformation and Clarke transformation to convert the three-phase AC current into DC current of the direct axis and the quadrature axis, and use the proportional-integral controller to adjust the current of the direct axis and the quadrature axis respectively so that they track the reference value of the wheel speed. The inverter then generates a PWM signal according to the output of the proportional-integral controller to control the operation of the test motor 21. Vector control can realize high-precision wheel speed control, maintain good torque and efficiency at low speed, and then make the wheel speed of the electric drive assembly accurately maintain the set wheel speed value of the control system 3, so as to simulate the real working environment.

[0033] Secondly, the electric drive assembly includes a synchronous motor and an electronic control. The control system 3 controls the electronic control and then controls the synchronous motor to output a stable set torque value, wherein the electronic control also controls the synchronous motor through vector control.

[0034] Furthermore, the control system 3 includes: a display screen 31 connected to the test electronic control 22 and the electric drive assembly via a CAN bus; and a discharge cabinet 32 ​​electrically connected to the test motor 21 and the electric drive assembly, the discharge cabinet 32 ​​being capable of inputting alternating current and direct current, and outputting direct current for driving the test component 2 and the electric drive assembly.

[0035] Specifically, the CAN bus is a serial communication protocol for realizing real-time data transmission. After the control system 3 controls the test electronic control 22 and the motor controller of the electric drive assembly respectively, the test electronic control 22 and the motor controller transmit the operating status data of the test motor 21 and the synchronous motor of the electric drive assembly to the display screen 31 through the CAN bus for display, so that the operator can control the test motor 21 and the synchronous motor through the display screen 31.

[0036] Secondly, the power supply of the discharge cabinet 32 ​​is the factory power grid, which transmits 380V AC power to the test motor 21, and at the same time transmits DC power to the electric drive assembly to drive it to rotate. When the test motor 21 rotates, AC power is generated. The test electronic control 22 includes a rectifier that converts AC power into DC power. The converted DC power is input into the discharge cabinet 32 ​​to realize energy recovery, thereby improving the energy utilization rate of embodiment one, thereby reducing the energy consumption during the test process, and thereby reducing the test cost.

[0037] Embodiment 2

[0038] like Figure 4 As shown, this embodiment provides a test method for testing the durability of an electric drive assembly of an electric forklift, comprising:

[0039] S1: Set the torque and wheel speed change curve and operating time of the electric drive assembly according to the national standard working conditions;

[0040] Specifically, international working conditions include: indoor warehousing operations, the wheel speed is usually 1000-2000rpm to ensure high operating speed and efficiency, and the torque is usually 100-200Nm to cope with general load changes; outdoor handling operations, the wheel speed is usually 500-1500rpm to adapt to uneven ground and complex working environment, and the torque is usually 200-400Nm to provide sufficient driving force and climbing ability; heavy-load handling operations, the wheel speed is usually 500-1000rpm to ensure sufficient driving force under heavy load conditions, and the torque is usually 400-600Nm to cope with frequent starting and stopping.

[0041] Secondly, the operator sets different wheel speed and torque values ​​on the display screen 31 according to the wheel speed and torque requirements under international working conditions, as well as a continuous operating time of 200 hours, so that the test device in Example 1 can independently run the durability test.

[0042] S2: Connect the output shaft of the electric drive assembly, the transmission half shaft 13, the transmission shaft 14, and the test motor 21 in sequence;

[0043] Specifically, the electric drive assembly is fixed in the cavity of the mounting bracket 12 by bolts, and then the ends of the symmetrically arranged transmission half-shafts 13 forming tooth grooves are respectively connected to the output shaft of the electric drive assembly, and the transmission half-shafts 13 are then connected to the universal joints of the transmission shaft 14 by bolts, so that the connection between the transmission half-shafts 13 and the transmission shaft 14 is a soft connection, thereby avoiding torque loss caused by eccentric rotation of the hard connection during transmission. The transmission shaft 14 is then bolted to the housing of the test motor 21 through the universal joint, so that the torque of the electric drive assembly can be transmitted to the test motor 21, and the wheel speed of the test motor 21 can be transmitted to the electric drive assembly, so that the electric drive assembly obtains the set wheel speed and torque, and can accurately simulate the real international working conditions and obtain accurate test results.

[0044] S3: The control system 3 controls the discharge cabinet 32, the test electronic control 22 and the motor controller of the electric drive assembly to make the electric drive assembly and the test motor 21 rotate forward and reversely according to the value set in S1 to test the durability respectively. The display screen 31 monitors the operating status of the test motor 21 and the electric drive assembly in real time. When the operating status of the electric drive assembly exceeds the rated value, the control system 3 will sound an alarm, and the running time will be counted at the end of the test.

[0045] Specifically, the motor controller of the test electronic control 22 and the electric drive assembly includes a voltage sensor, a current sensor, a temperature sensor, etc. The control system 3 sends control instructions for setting the wheel speed and torque to the test electronic control 22 and the motor controller through the CAN bus. After the test electronic control 22 and the electric drive assembly drive the test motor 21 and the synchronous motor, the current, voltage, temperature and other data of each motor are collected. The test motor 21 and the synchronous motor need to be measured in forward and reverse rotation respectively, so as to obtain the durability under the actual working conditions. The forward and reverse rotation data are sent to the main control node through the CAN bus. The display screen 31 receives the status information of the main control node. The display screen 31 compares the status information with the status information on the nameplate of the electric drive assembly in real time to determine whether the electric drive assembly is working normally. When the value of the status information exceeds the rated value on the nameplate, the display screen 31 concludes that the synchronous motor is in an abnormal working stage, issues an alarm and stops the rotation of the test motor and the synchronous motor. The operator obtains the cause of the fault by checking the fault. When the cause of the fault is that a component of the electric drive assembly is overloaded, it can be determined that the running time at this time is the longest running time of the electric drive assembly, and then determines whether its durability meets the requirements.

[0046] Secondly, during the test, a decibel meter is needed to test the noise of the operating environment. When the noise exceeds the specified value, the test motor and synchronous motor stop rotating, check the cause and record the operating time.

[0047] Furthermore, the operating status of the electric drive assembly is fed back to the display screen 31 through the motor controller. The display screen 31 compares various values ​​of the operating status with various values ​​of the normal status in real time until the values ​​exceed the alarm and the test experiment is terminated. The operating status includes: voltage, current, temperature, chip power supply voltage and communication interruption time.

[0048] Specifically, the display screen 31 has stored the operating conditions set for the electric drive assembly during production. When it receives the operating conditions of the synchronous motor under international working conditions measured by the motor controller in real time, it can compare them with the rated operating conditions in real time to determine whether the electric drive assembly is working normally. Abnormal operating conditions such as measured voltage exceeding the maximum voltage of the synchronous motor, measured current being the maximum current of the synchronous motor, measured temperature being the maximum temperature of the synchronous motor, measured motor controller chip power supply voltage not less than 10V, and communication interruption time between the motor controller and the display screen 31 being greater than 2s, etc.

[0049] S4: Further inspection of the electric drive assembly after operation. In S4, the operator disassembles the electric drive assembly for inspection, including: housing cleanliness, input oil seal, intermediate shaft oil seal, housing sealing performance, and bearing wear.

[0050] Specifically, after the test experiment, the operator disassembles the electric drive assembly to obtain each part, and then observes the appearance of the shell for any bumps, cracks, oil leakage, etc., observes whether the input oil seal and the intermediate oil seal are intact and whether there is any oil leakage, observes whether the internal gear surface is damaged, scratched, pitting and other failure phenomena, observes whether the color of the residual oil inside the gearbox is normal, observes whether the bearing is damaged or stuck, and measures the key dimensions of the shell to see if there is any deformation.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0052] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A test device for testing the durability of an electric drive assembly of an electric forklift, characterized in that: include: A mounting assembly (1), the mounting assembly (1) forming a mounting surface for mounting the electric drive assembly; A test assembly (2) arranged on the mounting surface, the test assembly (2) being symmetrically arranged at both ends of the output shaft of the electric drive assembly, the test assembly (2) being capable of limiting the rotational speed of the output shaft of the electric drive assembly to a wheel side rotational speed setting value; and A control system (3) connected to the test component (2) and the electric drive assembly, wherein the control system (3) is capable of controlling the wheel speed and torque of the electric drive assembly and comparing the operating condition of the electric drive assembly with the rated operating condition of the electric drive assembly in real time.

2. The testing device according to claim 1, characterized in that: The test component (2) comprises: A test motor (21) arranged on the mounting surface, the test motor (21) being a permanent magnet synchronous motor; and A test electronic control (22) is arranged on the test motor (21), and the electronic control system controls the wheel speed of the test motor (21) according to a signal output by the control system (3).

3. The testing device according to claim 1, characterized in that: The control system (3) comprises: a display screen (31) connected to the test electronic control (22) and the electric drive assembly via a CAN bus; and A discharge cabinet (32) electrically connected to the test motor (21) and the electric drive assembly, the discharge cabinet (32) being capable of inputting alternating current and direct current and outputting direct current for driving the test component (2) and the electric drive assembly.

4. The testing device according to claim 1, characterized in that: The installation component (1) comprises: A mounting platform (11), wherein the horizontal top surface of the mounting platform (11) is the mounting surface; A mounting bracket (12) disposed on the mounting surface, the mounting bracket (12) forming a cavity for mounting the electric drive assembly; A transmission half shaft (13) is symmetrically arranged on the mounting bracket (12) with the output shaft of the electric drive assembly as the center, one end of the transmission half shaft (13) is connected to the output shaft of the electric drive assembly, and the transmission half shaft (13) is detachably connected to the mounting bracket (12); and A transmission shaft (14) for transmitting torque, one end of the transmission shaft (14) is connected to the transmission half shaft (13), and the other end of the transmission shaft (14) is connected to the test assembly (2).

5. The testing device according to claim 4, characterized in that: The mounting platform (11) forms a movable groove (15) along the axial direction of the transmission shaft (14), and the test component (2) can move relative to the electric drive assembly along the movable groove (15).

6. The testing method of the testing device according to any one of claims 1 to 5, characterized in that: include: S1: setting the torque of the electric drive assembly and the wheel speed change curve of the test motor (21) and the operating time according to the national standard working conditions; S2: Connecting the output shaft of the electric drive assembly, the transmission half shaft (13), the transmission shaft (14), and the test motor (21) in sequence; S3: The control system (3) controls the discharge cabinet (32), the test electric control (22) and the motor controller of the electric drive assembly to make the electric drive assembly and the test motor (21) rotate forward and reversely according to the value set in S1 to test the durability respectively. The display screen (31) monitors the operating conditions of the test motor (21) and the electric drive assembly in real time. When the operating condition of the electric drive assembly exceeds the rated value, the control system (3) will sound an alarm, and the running time will be counted after the test ends; S4: Conduct further inspection on the electric drive assembly after the operation is completed.

7. The testing method according to claim 6, characterized in that: In S1, international working conditions mainly include indoor warehousing operations with medium wheel speed and medium torque, outdoor handling operations with low wheel speed and high torque, and heavy-load handling operations with low wheel speed and ultra-high torque.

8. The testing method according to claim 6, characterized in that: In S3, the current flow direction of the discharge cabinet (32) is as follows: the discharge cabinet (32) transmits direct current and alternating current to the electric drive assembly and the test component (2) respectively, and the test motor (21) rotates to generate alternating current, which is converted into direct current through the test electronic control (22) and input into the discharge cabinet (32), thereby realizing electric energy recovery.

9. The testing method according to claim 6, characterized in that: In S3, the operating status of the electric drive assembly is fed back to the display screen (31) through the motor controller, and the display screen (31) compares various numerical values ​​of the operating status with various numerical values ​​of the normal status in real time until the numerical values ​​exceed an alarm and the test experiment is terminated, wherein the operating status includes: voltage, current, temperature, chip power supply voltage and communication interruption time.

10. The testing method according to claim 6, characterized in that: In S4, the operator disassembled the electric drive assembly for inspection, including: housing cleanliness, input oil seal, intermediate shaft oil seal, housing sealing performance, and bearing wear.

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