A digital hydraulic motor test bench and a digital hydraulic motor performance verification method

Abstract

The present application provides a digital hydraulic motor test bench and a digital hydraulic motor performance verification method. The digital hydraulic motor test bench provided in the present application includes an installation module, a loading module and a driving module; wherein the driving module includes a DC speed regulating motor; the installation module includes a motor under test, a loading motor, and a plurality of couplings; one end of the plurality of couplings is connected to the motor under test, and the other end is connected to the loading motor, and a plurality of sensors are installed on the motor under test; the oil pressure port of the motor under test is connected to the loading module, and the loading module includes a direction control circuit and a loading circuit, and the plurality of oil pressure ports are respectively connected to the first series connection point and the second series connection point of the direction control circuit. The digital hydraulic motor test bench and the digital hydraulic motor performance verification method provided in the present application are used to realize the verification of the key control performance of the digital hydraulic motor.

Description

Technical Field

[0001] The present application relates to the field of hydraulic technology, and in particular to a digital hydraulic motor test bench and a digital hydraulic motor performance verification method. Background Art

[0002] Digital hydraulic motors play a key role in modern hydraulic systems, and their performance directly affects the efficiency and stability of the entire system. Through the digital hydraulic motor test bench, various working conditions and abnormal working conditions can be simulated to conduct pressure resistance, vibration, impact and other tests on digital hydraulic motors. This can not only find potential problems in design or manufacturing, but also verify the reliability of digital hydraulic motors under extreme conditions. The data from the digital hydraulic motor test bench test provides a scientific basis for optimizing design, improving production processes and improving product quality, thereby ensuring that the digital hydraulic motors achieve the expected performance and life in actual use.

[0003] At present, the performance verification of digital hydraulic motors is mainly based on traditional digital hydraulic motor test benches, but it cannot verify the key control performance of digital hydraulic motors. Therefore, there is an urgent need for a digital hydraulic motor test bench to verify the key control performance of digital hydraulic motors. Summary of the invention

[0004] In view of this, the present application provides a digital hydraulic motor test bench and a digital hydraulic motor performance verification method, so as to realize the verification of the key control performance of the digital hydraulic motor.

[0005] Specifically, the present application is implemented through the following technical solutions:

[0006] The first aspect of the present application provides a digital hydraulic motor test bench, characterized in that the motor test bench includes an installation module, a loading module and a driving module; wherein the driving module includes a DC speed regulating motor, which is used to provide high-pressure oil to the loading module when the performance of the motor under test is verified; the installation module includes a motor under test, a loading motor, and a plurality of couplings; the motor under test is provided with an oil pressure port, the oil pressure port is connected to the loading module, one end of the plurality of couplings is connected to the motor under test, and the other end is connected to the loading motor, a plurality of sensors are installed on the motor under test, the type of the sensor is determined according to the type of the motor under test and the performance to be verified, and the sensor is used to collect performance parameters of the motor under test during the loading process, wherein the performance parameters are used to perform performance verification on the motor under test;

[0007] The oil pressure port of the motor under test is connected to the loading module, and the loading module includes a direction control circuit and a loading circuit. The multiple oil pressure ports are respectively connected to the first series connection point and the second series connection point of the direction control circuit. The loading module is used to determine the flow direction of the high-pressure oil based on the performance to be verified of the motor under test, and apply a load to the loading motor based on the flow direction of the high-pressure oil. The loading motor transfers the load to the motor under test to control the loading of the motor under test.

[0008] A second aspect of the present application provides a digital hydraulic motor performance verification method, which is applied to any one of the digital hydraulic motor test benches provided in the first aspect of the present application; the method comprises:

[0009] Determine the flow direction of the high pressure oil based on the performance to be verified of the motor under test;

[0010] Applying a load to the motor under test based on the flow direction of the high-pressure oil to control the loading of the motor under test;

[0011] The performance parameters of the motor under test during the loading process are collected based on sensors, and the performance of the motor under test is verified based on the performance parameters.

[0012] The digital hydraulic motor test bench and digital hydraulic motor performance verification method provided by the present application, in the first aspect, use a DC speed regulating motor as a driving device, which can realize speed closed-loop control, improve the accuracy of the high-pressure oil output by the tested motor, and can test the optimal speed range of the tested motor, thereby improving the accuracy and reliability of the control performance verification of the tested motor. In the second aspect, by setting the digital hydraulic motor test bench as an installation module, a driving module and a loading module, the tested motor is installed on the installation module, and the driving module provides high-pressure oil to the loading module. The loading module applies a load to the tested motor based on the performance to be verified of the tested motor to control the loading of the tested motor, and the working load of the tested motor can be accurately adjusted, thereby controlling the output pressure and flow of the tested motor, avoiding idling or overspeeding of the tested motor, and improving stability. In addition, based on the sensor installed on the tested motor, the performance parameters of the tested motor during the loading process are collected in real time, and the performance of the tested motor can be verified based on the performance parameters corresponding to the performance to be verified and the performance verification method in the subsequent stage, the key control performance of the motor is verified, and the new functions such as multi-source state detection and life prediction of the motor are realized, providing test conditions for the factory test and research and development of new motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A structural schematic diagram of a first embodiment of a digital hydraulic motor test bench provided in this application;

[0014] Figure 2This is a schematic diagram of the structure of an installation module shown in an exemplary embodiment of the present application;

[0015] Figure 3 This is a schematic diagram of the structure of a driving module shown in an exemplary embodiment of the present application;

[0016] Figure 4 This is a schematic diagram of the structure of a loading module shown in an exemplary embodiment of the present application;

[0017] Figure 5 A flow chart of a first embodiment of a digital hydraulic motor performance verification method provided in this application;

[0018] Description of reference numerals:

[0019] 1, 4: DC speed regulating motor

[0020] 2, 5: Oil suction filter

[0021] 3: Proportional piston pump

[0022] 6: Dosing pump

[0023] 7: Relief valve

[0024] 8, 10: High pressure filter

[0025] 9: Safety valve

[0026] 11, 12: Flow meter

[0027] 13.1, 13.2, 13.3, 13.4: Two-way cartridge valve

[0028] 14.1, 14.2: Solenoid reversing valve

[0029] 15: Temperature sensor

[0030] 16.1, 16.2, 16.3, 16.4: Pressure sensors

[0031] 17.1, 17.2, 17.3, 17.4: Check valve

[0032] 18: Proportional relief valve

[0033] 19: Motor under test

[0034] 20.1, 20.2: Angle sensor

[0035] 21: Torque sensor

[0036] 22: Loading motor

[0037] 23: Speed ​​sensor

[0038] 24.1, 24.2: Vibration sensor

[0039] 25.1, 25.2: Coupling DETAILED DESCRIPTION

[0040] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0041] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0042] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0043] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0044] Figure 1 This is a structural diagram of the first embodiment of the digital hydraulic motor test bench provided in this application. Figure 1 The digital hydraulic motor test bench provided in this embodiment comprises an installation module, a loading module and a driving module; wherein the driving module comprises a DC speed regulating motor, which is used to provide high-pressure oil to the loading module when the performance of the motor under test is verified; the installation module comprises a motor under test, a loading motor and a plurality of couplings; a pressure oil port is provided on the motor under test, the pressure oil port is connected to the loading module, one end of the plurality of couplings is connected to the motor under test, and the other end is connected to the loading motor, a plurality of sensors are installed on the motor under test, the type of the sensor is determined according to the type of the motor under test and the performance to be verified, and the sensor is used to collect the performance parameters of the motor under test during the loading process, wherein the performance parameters are used to perform performance verification on the motor under test;

[0045] The oil pressure port of the motor under test is connected to the loading module, and the loading module includes a direction control circuit and a loading circuit. The multiple oil pressure ports are respectively connected to the first series connection point and the second series connection point of the direction control circuit. The loading module is used to determine the flow direction of the high-pressure oil based on the performance to be verified of the motor under test, and apply a load to the loading motor based on the flow direction of the high-pressure oil. The loading motor transfers the load to the motor under test to control the loading of the motor under test.

[0046] For details, please refer to Figure 1 The digital hydraulic motor test bench includes an installation module, a driving module and a loading module. The driving module includes a DC speed regulating motor. The installation module includes a motor under test, a loading motor, and a plurality of couplings, wherein one end of the plurality of couplings is connected to the motor under test, and the other end of the plurality of couplings is connected to the loading motor. A plurality of sensors are installed on the motor under test, and an oil pressure port is provided on the motor under test, and the oil pressure port of the motor under test is connected to the loading module.

[0047] It should be noted that the tested motor and loading motor mentioned in this application are both digital hydraulic motors.

[0048] Furthermore, there are multiple types of sensors installed on the motor under test. These multiple types of sensors are installed on the motor under test at the same time to monitor the performance parameters of the motor under test during the loading process in real time. When determining the performance to be verified of the motor under test, it is only necessary to read the corresponding sensor based on the performance parameters required for the performance to be verified (for example, when the performance to be verified is pressure resistance and pressure stability, the performance parameters collected by the pressure sensor are usually read; when the performance to be verified is flow characteristics, flow accuracy, and response time, the flow sensor is usually read to collect relevant performance parameters; when the performance to be verified is position accuracy and response speed, the performance parameters collected by the displacement sensor are usually read), without reading all sensors.

[0049] Furthermore, the installation module is used to install the motor under test. The driving module is used to provide high-pressure oil to the loading module when verifying the performance of the motor under test. The loading module is used to determine the flow direction of the high-pressure oil provided by the driving module based on the performance to be verified of the motor under test, apply a load to the motor under test based on the flow direction, and control the loading of the motor under test.

[0050] In specific implementation, when it is necessary to verify the performance to be verified of the motor under test, the motor under test is fixed on the mounting module. The driving module generates high-pressure oil through driving action, and transmits the generated high-pressure oil to the loading module as needed. After the loading module receives the high-pressure oil transmitted by the driving module, it determines the flow direction of the high-pressure oil based on the performance to be verified of the motor under test, and controls the high-pressure oil to flow to the motor under test based on the determined flow direction, and controls the loading of the motor under test by applying a load to the motor under test. During the loading process of the motor under test, the sensor collects the performance parameters of the motor under test in real time. Based on the performance to be verified of the motor under test, the performance parameters that need to be collected and the corresponding sensor type are determined, and the performance of the motor under test is verified based on the performance parameters collected by the sensor of this sensor type.

[0051] The specific structure of each module of the digital hydraulic motor test bench is introduced below.

[0052] Figure 2 This is a schematic diagram of the structure of the installation module shown in an exemplary embodiment of the present application. Figure 2 The installation module includes a motor under test 19, a loading motor 22, a coupling 25.1, and a coupling 25.2. The motor under test 19 is connected to the loading motor 22 through the coupling 25.1 and the coupling 25.2. A plurality of sensors are installed on the motor under test 19 and the loading motor 22.

[0053] It should be noted that, in combination with the above description, multiple sensors have multiple types. Please continue to refer to Figure 2 In the installation module, multiple sensors include an angle sensor 20.1, an angle sensor 20.2, a torque sensor 21, a speed sensor 23, a vibration sensor 24.1, and a vibration sensor 24.2. The angle sensor 20.1 and the vibration sensor 24.1 are installed on the motor 19 under test, the angle sensor 20.2 and the vibration sensor 24.2 are installed on the loading motor 22, and the torque sensor 21 and the speed sensor 23 are installed on the connection between the motor 19 under test and the loading motor 22.

[0054] Furthermore, the angle sensor 20.1 and the angle sensor 20.2 monitor the swash plate angles of the motor 19 under test and the loading motor 22 in real time, and input the swash plate angles as feedback signals into the closed-loop control system of the motor displacement, which can ensure that the motor can accurately adjust the displacement as needed to achieve the best working state; the vibration sensor 24.1 and the vibration sensor 24.2 monitor the vibration frequency and amplitude of the motor 19 under test and the loading motor 22 in X, Y, and Z directions when loaded in real time to evaluate the working state of the motor, monitor potential faults, and provide an important basis for motor life prediction; the torque sensor 21 monitors the output torque of the motor 19 under test in real time, and evaluates the mechanical properties and energy conversion efficiency of the motor 19 under test by comparing it with the input power; the speed sensor 23 monitors the output speed of the motor 19 under test in real time, and adjusts and controls the speed of the motor 19 under test based on the relationship between the output speed and the preset speed, to ensure that the output speed of the motor 19 under test is within the preset speed range.

[0055] In specific implementation, when the motor 19 to be tested is loaded, the angle sensor 20.1, the angle sensor 20.2, the torque sensor 21, the speed sensor 23, the vibration sensor 24.1, and the vibration sensor 24.2 monitor in real time the various performance parameters of the motor 19 to be tested during loading. Based on the performance to be verified of the motor 19 to be tested, the target performance parameters to be collected are determined. The sensor corresponding to the target performance parameter reads the target performance parameter, and the evaluation score corresponding to the performance to be verified is calculated based on the target performance parameter, and the performance to be verified of the motor 19 to be tested is evaluated based on the evaluation score.

[0056] Figure 3 This is a schematic diagram of the structure of a driving module shown in an exemplary embodiment of the present application. Figure 3 The driving module includes a power unit and an oil replenishing unit. The power unit is connected to a direction control circuit in the loading module, and the oil replenishing unit is connected to a loading circuit in the loading module.

[0057] Furthermore, when the power unit is used to verify the performance of the motor 19 under test, it provides high-pressure oil to the direction control circuit in the loading module; when the oil replenishment unit is used to verify the performance of the motor 19 under test, when the pressure of the oil outlet of the motor 19 under test is lower than the preset threshold, it provides low-pressure oil to the loading circuit in the loading module. The preset threshold is set according to actual needs and is not limited in this embodiment.

[0058] For details, please refer to Figure 3The power unit includes a DC speed regulating motor 1, an oil suction filter 2, a proportional plunger pump 3, a high-pressure filter 8, and a relief valve 7. The DC speed regulating motor 1 is directly connected to the proportional plunger pump 3; the output end of the proportional plunger pump 3 is respectively connected to the high-pressure filter 8 and the relief valve 7; and the oil suction filter 2 is located at the oil suction end of the proportional plunger pump 3.

[0059] Furthermore, the DC speed regulating motor 1 is used to drive the proportional piston pump 3. The DC speed regulating motor 1 performs closed-loop speed regulation according to its own speed and the set speed, and adjusts its own speed based on the received feedback signal to control the operating speed and oil volume of the proportional piston pump 3. The proportional piston pump 3 is used to provide stable high-pressure oil according to the driving speed of the DC speed regulating motor 1. The overflow valve 7 is used to adjust and control the output pressure of the proportional piston pump 6, and can simulate abnormal working conditions such as pressure shock and system vibration, so as to provide a test circuit for realizing the multi-source state monitoring and life prediction functions of the motor under test. The filtration accuracy of the high-pressure filter 8 is 5 microns, which is used to filter impurities in the high-pressure oil output by the proportional piston pump 3 to ensure that the high-pressure oil entering the loading module is clean. The filtration accuracy of the oil suction filter 2 is 100μm, which is used to filter the high-pressure oil sucked from the oil tank and remove impurities in the high-pressure oil.

[0060] In specific implementation, the DC speed regulating motor 1 starts and drives the proportional piston pump 3 to operate. The speed of the DC speed regulating motor 1 can be adjusted to control the flow output of the proportional piston pump 3. The proportional piston pump 3 sucks hydraulic oil from the oil tank through the oil suction filter 2, and outputs high-pressure oil after pressurizing it. The high-pressure oil passes through the relief valve 7, and the relief valve 7 adjusts the flow of high-pressure oil according to the set pressure value, releases excess pressure, and prevents the system from over-pressure. Further, the high-pressure oil reaches the loading module through the high-pressure filter 8, and the high-pressure filter 8 removes impurities in the high-pressure oil to ensure the cleanliness of the high-pressure oil.

[0061] The digital hydraulic motor test bench provided in this embodiment, on the one hand, uses a DC speed regulating motor as a driving device, which can realize closed-loop speed control, improve the accuracy of the high-pressure oil output by the proportional piston pump, and can test the optimal speed range of the proportional piston pump, thereby improving the accuracy and reliability of the control performance verification of the motor under test. On the second hand, by designing an overflow valve and a high-pressure filter to monitor and adjust the high-pressure oil output by the proportional piston pump in real time, it can ensure that the pressure of the proportional piston pump is within the set range, and prevent pressure overshoot caused by system overload or proportional piston pump failure. On the third hand, by providing a high-pressure filter and an oil suction filter, the cleanliness of the high-pressure oil can be guaranteed, reducing interference with the performance verification results.

[0062] For details, please continue to refer to Figure 3The oil replenishing unit includes a DC speed regulating motor 4, an oil suction filter 5, a metering pump 6, a safety valve 9, and a high-pressure filter 10; wherein the DC speed regulating motor 4 is directly connected to the metering pump 6; the oil suction filter 5 is located at the oil suction end of the metering pump 6; the metering pump 6 is connected to the high-pressure filter 10; and the safety valve 9 is located between the outlet of the metering pump 6 and the oil tank.

[0063] Furthermore, the DC speed regulating motor 4 is used to drive the metering pump 6. The DC speed regulating motor 4 performs closed-loop speed regulation according to its own speed and the set speed, and adjusts its own speed based on the received feedback signal to control the operating speed and oil volume of the metering pump 6. The metering pump 6 is used to provide stable low-pressure oil according to the driving speed of the DC speed regulating motor 4. The safety valve 9 is used to adjust and control the output pressure of the metering pump 6. The high-pressure filter 10 has a filtration accuracy of 5 microns and is used to filter impurities in the low-pressure oil output by the metering pump 6 to ensure that the low-pressure oil entering the loading module is clean. The oil suction filter 5 has a filtration accuracy of 100μm and is used to filter the low-pressure oil sucked from the oil tank to remove impurities in the low-pressure oil.

[0064] In specific implementation, the DC speed regulating motor 4 starts and drives the metering pump 6, which sucks low-pressure oil from the oil tank through the oil suction filter 5. The low-pressure oil reaches the loading module through the high-pressure filter 10, and the high-pressure filter 10 removes impurities in the low-pressure oil to ensure the cleanliness of the low-pressure oil. When the outlet pressure of the metering pump 6 is higher than the preset pressure, the safety valve 9 opens to overflow the excess oil at the outlet of the metering pump 6 back to the oil tank.

[0065] The oil replenishing unit provided in this embodiment ensures the controllability of the speed and the accuracy of the output oil by setting a DC speed regulation motor and a speed closed-loop control; ensures the cleanliness of the low-pressure oil received by the loading module by setting an oil suction filter and a high-pressure filter; ensures the safety of the entire oil replenishing unit by setting a safety valve; in summary, the accuracy of the performance verification of the motor under test is improved.

[0066] The digital hydraulic motor test bench provided in this embodiment provides an oil replenishment unit to indirectly provide low-pressure oil to the motor under test when the pressure at the oil outlet of the motor under test is lower than a preset threshold. On the one hand, it effectively prevents the phenomenon of air suction and ensures the normal operation and stability of the motor under test. On the other hand, during the performance verification process, the oil replenishment unit can automatically replenish low-pressure oil to the loading module when the pressure at the oil outlet of the motor under test is lower than a preset threshold, thereby ensuring the smooth progress of the performance verification, reducing the situation of operation interruption, improving the test efficiency, and improving the test accuracy.

[0067] For details, please continue to refer to Figure 3, flowmeter 11 and flowmeter 12 are also provided on the right side of the oil replenishment unit. Among them, flowmeter 11 is connected to the loading module through R1 port, and flowmeter 12 is connected to the oil drain port L of the motor 19 under test through L port.

[0068] Furthermore, the flow meter 11 is used to measure the amount of oil returned from the motor 19 under test. The flow meter 12 is used to measure the amount of oil discharged from the motor 19 under test.

[0069] The digital hydraulic motor test bench provided in this embodiment can effectively monitor and maintain the flow rate of oil in the oil supply circuit and the oil return circuit by setting different flow meters to monitor the return oil volume and the oil discharge volume of the motor under test. Based on this, the volumetric efficiency and internal wear degree of the motor under test can be judged, and data can be provided for the multi-source state detection, intelligent fault diagnosis, and life prediction algorithms of the motor under test.

[0070] Figure 4 This is a schematic diagram of the structure of a loading module shown in an exemplary embodiment of the present application. Figure 4 The loading module includes a direction control loop and a loading loop, and a plurality of oil pressure ports of the motor under test are respectively connected to a first series connection point and a second series connection point of the direction control loop.

[0071] Furthermore, after receiving the high-pressure oil transmitted by the drive module, the direction control circuit determines the flow direction of the high-pressure oil based on the performance to be verified of the motor 19 under test, controls the high-pressure oil to flow to the motor 19 under test based on the flow direction of the high-pressure oil, applies a load to the motor 19 under test, and controls the loading of the motor 19 under test. The loading circuit controls the high-pressure oil output by the motor 19 under test to flow back to the oil tank and controls the low-pressure oil transmitted by the drive module to flow to the motor 19 under test through the loading motor 22.

[0072] Specifically, the directional control circuit includes a plurality of two-way cartridge valves and a plurality of electromagnetic reversing valves; wherein the output end of the electromagnetic reversing valve is connected to the input end of the two-way cartridge valve; the electromagnetic reversing valve is used to control the switch of the two-way cartridge valve; the first two-way cartridge valve and the third two-way cartridge valve are connected in series, and their series connection point is the first series connection point; the second two-way cartridge valve and the fourth two-way cartridge valve are connected in series, and their series connection point is the second series connection point.

[0073] For details, please continue to refer to Figure 4The plurality of two-way cartridge valves include a two-way cartridge valve 13.1, a two-way cartridge valve 13.2, a two-way cartridge valve 13.3, and a two-way cartridge valve 13.4, and the plurality of electromagnetic reversing valves include an electromagnetic reversing valve 14.1 and an electromagnetic reversing valve 14.2. Among them, the electromagnetic reversing valve 14.1 is used to control the switch of the two-way cartridge valve 13.2 and the two-way cartridge valve 13.4, and the electromagnetic reversing valve 14.2 is used to control the switch of the two-way cartridge valve 13.1 and the two-way cartridge valve 13.3. The two-way cartridge valve 13.1 and the two-way cartridge valve 13.3 are connected in series and are located on both sides of the electromagnetic reversing valve 14.2, and the series connection point of the two-way cartridge valve 13.1 and the two-way cartridge valve 13.3 is the first series connection point. The two-way cartridge valve 13.2 and the two-way cartridge valve 13.4 are connected in series and are located on both sides of the electromagnetic reversing valve 14.1. The series connection point of the two-way cartridge valve 13.2 and the two-way cartridge valve 13.4 is the second series connection point.

[0074] For further information, please refer to Figure 4 A plurality of pressure sensors and temperature sensors are also installed on the motor 19 under test. Among them, the pressure sensor 16.1 is installed at the first oil inlet (port A) of the motor 19 under test, the pressure sensor 16.2 is installed at the first oil pressure port (B) of the motor 19 under test, and the temperature sensor 15 is installed at the oil return line of the motor 19 under test.

[0075] Furthermore, the pressure sensor 16.1 is used to monitor the pressure of the motor under test 19 at the first oil inlet, and the pressure sensor 16.2 is used to monitor the pressure of the motor under test 19 at the second oil inlet. The pressure sensors 16.1 and 16.2 work together to calculate the pressure drop of the motor under test 19, providing data support for calculating the mechanical efficiency of the motor under test 19. The temperature sensor 15 is used to monitor the temperature rise of the return oil of the motor under test 19, providing data support for multi-source monitoring of the motor under test 19.

[0076] It should be noted that the performance to be verified of the motor 19 under test is different, the flow direction of the high-pressure oil is different, and the loading direction of the motor 19 under test is also different.

[0077] In a specific implementation, in a possible implementation mode, when the motor 19 to be tested is controlled to load clockwise, the electromagnetic reversing valve 14.1 is energized and the electromagnetic reversing valve 14.2 is de-energized. The A port of the electromagnetic reversing valve 14.1 is connected to the T port, the spring chambers of the two-way cartridge valve 13.2 and the two-way cartridge valve 13.4 are connected to the R1 port and return to the oil tank, the spring chamber is pressure-free, and the two-way cartridge valve 13.2 and the two-way cartridge valve 13.4 are connected; the high-pressure oil flows to the motor 19 to be tested through the electromagnetic reversing valve 14.1, the two-way cartridge valve 13.2, and the first oil inlet (A) of the loading module, and flows back to the oil tank through the first oil pressure port (B) of the loading module and the two-way cartridge valve 13.4.

[0078] In another possible implementation, when the motor 19 to be tested is controlled to be loaded counterclockwise, the electromagnetic reversing valve 14.2 is energized and the electromagnetic reversing valve 14.1 is de-energized. The A port of the electromagnetic reversing valve 14.2 is connected to the T port, the spring chambers of the two-way cartridge valve 13.1 and the two-way cartridge valve 13.3 are connected to the R1 port and return to the oil tank, the spring chamber is pressure-free, and the two-way cartridge valve 13.1 and the two-way cartridge valve 13.3 are connected; the high-pressure oil flows to the motor 19 to be tested through the electromagnetic reversing valve 14.2, the two-way cartridge valve 13.3, and the first oil pressure port (B) of the loading module, and flows back to the oil tank through the first oil inlet port (A) of the loading module and the two-way cartridge valve 13.1.

[0079] The digital hydraulic motor test bench provided in this embodiment, on the one hand, can realize the bidirectional flow of high-pressure oil by setting a directional control circuit composed of an electromagnetic reversing valve and a two-way cartridge valve, that is, no matter from which direction the high-pressure oil enters the directional control circuit, it will realize the expected flow path through the energized electromagnetic reversing valve and the corresponding two-way cartridge valve in series, so that the loading module can support bidirectional loading and control, and realize bidirectional loading of the motor under test. On the other hand, the control flexibility of the electromagnetic reversing valve is relatively high. Combined with the two-way cartridge valve, it can be flexibly configured according to different operating requirements. By changing the control logic of the electromagnetic reversing valve, different control schemes can be easily realized to control the different flow directions of the high-pressure oil, which enhances adaptability and scalability, can be quickly opened and closed under high pressure and large flow conditions, reduce the pressure loss of the hydraulic system, quickly and effectively control the direction and flow of the liquid flow, accurately switch the flow direction of the high-pressure oil, and realize high-performance directional control. Thirdly, by controlling the flow direction of high-pressure oil through a directional control loop, various working conditions of the motor under test in actual applications can be simulated, and the performance of the motor under test under various working conditions can be fully verified. The working conditions can be quickly adjusted according to different verification requirements without replacing equipment, reducing the need for additional test equipment. It has high flexibility, helps save resources and reduce testing costs, improves the accuracy and reliability of performance verification, and realizes refined performance analysis and fault diagnosis.

[0080] For details, please continue to refer to Figure 4 The loading circuit includes a hydraulic circuit and a proportional relief valve 18. The input end of the proportional relief valve 18 is connected to the output end of the hydraulic circuit.

[0081] Furthermore, the hydraulic circuit is used to control the high-pressure oil flowing through the loading motor 22 to flow to the proportional relief valve 19, and to control the low-pressure oil delivered by the drive module to flow to the loading motor 22. The proportional relief valve 18 is used to receive the oil delivered by the hydraulic circuit and overflow the oil exceeding the set pressure back to the oil tank.

[0082] For details, please continue to refer to Figure 4The hydraulic circuit includes one-way valve 17.1, one-way valve 17.2, one-way valve 17.3 and one-way valve 17.4; among them, one-way valve 17.1 and one-way valve 17.4 are used to control the second oil pressure port (A1) of the loading module; one-way valve 17.2 and one-way valve 17.3 are used to control the second oil inlet port (B1) of the loading module.

[0083] In a specific implementation, in a possible implementation, when the motor 19 under test is controlled to load clockwise, the high-pressure oil enters the hydraulic circuit through the second oil inlet (A1) of the loading module, passes through the spring chamber of the check valve 17.1 and the plunger chamber of the check valve 17.4 in sequence, and flows to the proportional relief valve 18. The low-pressure oil delivered by the drive module enters the hydraulic circuit and flows to the loading motor 22 through the second oil pressure port (B1) of the loading module.

[0084] In another possible implementation, when the motor 19 under test is controlled to load counterclockwise, the high-pressure oil enters the hydraulic circuit through the second oil pressure port (B1) of the loading module, passes through the spring chamber of the check valve 17.2 and the plunger chamber of the check valve 17.3 in sequence, and flows to the proportional relief valve 18. The low-pressure oil delivered by the drive module enters the hydraulic circuit and flows to the loading motor 22 through the second oil inlet port (A1) of the loading module.

[0085] The digital hydraulic motor test bench provided in this embodiment is provided with a proportional relief valve. On the one hand, the proportional relief valve can accurately adjust the pressure of the oil inlet flowing into the loading motor according to the set value, so as to achieve high-precision pressure control and ensure that the load pressure applied to the motor under test is accurate. On the other hand, by flexibly adjusting the pressure, the working conditions of the motor under test under different pressure conditions can be simulated, such as normal operation, pressure shock and system vibration. On the third hand, the proportional relief valve monitors the pressure of the high-pressure oil flowing through the loading motor based on the set maximum pressure value. When the set value is exceeded, the proportional relief valve releases the excess oil into the oil tank to prevent the system from being damaged due to excessive pressure and to ensure the safety of the test equipment and personnel.

[0086] The digital hydraulic motor test bench provided in this embodiment, on the one hand, uses a DC speed regulating motor as a driving device, which can realize closed-loop speed control, improve the accuracy of the high-pressure oil output by the tested motor, and can test the optimal speed range of the tested motor, thereby improving the accuracy and reliability of the control performance verification of the tested motor. On the other hand, by setting the motor test bench as an installation module, a driving module and a loading module, the tested motor is installed on the installation module, and the driving module provides high-pressure oil to the loading module. The loading module applies a load to the tested motor based on the performance to be verified of the tested motor to control the loading of the tested motor, and the working load of the tested motor can be accurately adjusted, thereby controlling the output pressure and flow of the tested motor, avoiding idling or overspeeding of the tested motor, and improving stability. In addition, based on the sensors installed on the tested motor, the performance parameters of the tested motor during the loading process are collected in real time, and the performance of the tested motor can be verified based on the performance parameters corresponding to the performance to be verified and the performance verification method in the subsequent process, thereby realizing the verification of the key control performance of the motor, and realizing new functions such as multi-source state detection and life prediction of the motor, providing test conditions for the factory test and research and development of new motors. Thirdly, the flow direction of different high-pressure oils is determined based on the performance to be verified, and then the loading of the motor under test is controlled based on different flow directions to perform performance verification based on the performance parameters during the loading process. It can simulate various working conditions of the motor under test in actual applications, comprehensively verify the performance of the motor under test under various working conditions, and can quickly adjust the working conditions according to different verification requirements without changing the equipment. It has high flexibility, improves the accuracy and reliability of performance verification, and realizes refined performance analysis and fault diagnosis. Fourthly, by setting up an oil replenishment unit, when the pressure of the oil outlet of the motor under test is lower than the preset threshold, low-pressure oil is indirectly provided to the motor under test, effectively preventing the phenomenon of air suction and ensuring the normal operation and stability of the motor under test. Moreover, during the performance verification process, the oil replenishment unit can automatically replenish low-pressure oil to the loading module when the pressure of the oil outlet of the motor under test is lower than the preset threshold, ensuring the smooth progress of performance verification, reducing the interruption of operation, improving test efficiency, and improving test accuracy. Fifthly, the flexible oil flow control design reduces the need for additional test equipment, and multiple performance verification functions can be realized by simply adjusting the valve and control system. This integrated design helps save resources and reduce testing costs.

[0087] Corresponding to the aforementioned embodiment of a digital hydraulic motor test bench, the present application also provides an embodiment of a digital hydraulic motor performance verification method.

[0088] Figure 5 This is a flow chart of the first embodiment of the digital hydraulic motor performance verification method provided by this application. Please refer to Figure 5, the method provided in this embodiment is applied to the digital hydraulic motor test bench described in any one of the present applications; the method comprises:

[0089] S501. Determine the flow direction of the high-pressure oil based on the performance to be verified of the motor under test.

[0090] Specifically, the flow direction of the high-pressure oil is related to the performance to be verified of the motor under test.

[0091] S502 , applying a load to the motor under test based on the flow direction of the high-pressure oil, and controlling the loading of the motor under test.

[0092] Specifically, the direction of the load applied to the motor under test is consistent with the flow direction of the high-pressure oil.

[0093] In this step, a load is applied to the motor under test in the same direction as the flow direction of the high-pressure oil, and the motor under test is loaded under the drive of the high-pressure oil.

[0094] S503 , collecting performance parameters of the motor under test during the loading process based on sensors, and performing performance verification on the motor under test based on the performance parameters.

[0095] Specifically, there are multiple types of sensors, for example, the types of sensors may include vibration sensors, temperature sensors, pressure sensors, displacement sensors, and force sensors. The performance to be verified of the motor under test corresponds to specific performance parameters, which need to be collected based on a specific type of sensor.

[0096] In this step, the performance parameters to be collected are determined based on the performance to be verified of the motor under test. The performance parameters recorded on the sensor are read based on the type of sensor corresponding to the performance parameter. The performance of the motor under test is verified based on the performance verification method corresponding to the performance to be verified and the read performance parameters.

[0097] The method of this embodiment can be used to execute Figure 1 The steps, specific implementation principles and implementation processes of the device embodiment shown are similar and will not be repeated here.

[0098] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0099] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0100] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A digital hydraulic motor test bench, characterized in that: The motor test bench includes an installation module, a loading module and a driving module; wherein the driving module includes a DC speed regulating motor, which is used to provide high-pressure oil to the loading module when verifying the performance of the motor under test; the installation module includes a motor under test, a loading motor, and a plurality of couplings; the motor under test is provided with an oil pressure port, the oil pressure port is connected to the loading module, one end of the plurality of couplings is connected to the motor under test, and the other end is connected to the loading motor, a plurality of sensors are installed on the motor under test, the type of the sensor is determined according to the type of the motor under test and the performance to be verified, and the sensor is used to collect performance parameters of the motor under test during the loading process, wherein the performance parameters are used to verify the performance of the motor under test; The oil pressure port of the motor under test is connected to the loading module, the loading module includes a direction control circuit and a loading circuit, a plurality of the oil pressure ports are respectively connected to a first series connection point and a second series connection point of the direction control circuit, the loading module is used to determine the flow direction of the high-pressure oil based on the performance to be verified of the motor under test, apply a load to the loading motor based on the flow direction of the high-pressure oil, the loading motor transmits the load to the motor under test, and controls the loading of the motor under test; The direction control circuit includes a plurality of two-way cartridge valves and a plurality of electromagnetic reversing valves; wherein the output end of the electromagnetic reversing valve is connected to the input end of the two-way cartridge valve; the electromagnetic reversing valve is used to control the switch of the two-way cartridge valve; the first two-way cartridge valve and the third two-way cartridge valve are connected in series, and the second two-way cartridge valve and the fourth two-way cartridge valve are connected in series; when the motor under test is controlled to load clockwise, the first electromagnetic reversing valve is energized and the second electromagnetic reversing valve is de-energized; the high-pressure oil passes through the first electromagnetic reversing valve, the third two-way cartridge valve and the fourth two-way cartridge valve. The second two-way cartridge valve and the first oil inlet of the loading module flow to the motor under test, and then flow back to the oil tank through the first oil pressure port of the loading module and the fourth two-way cartridge valve; when the motor under test is controlled to load counterclockwise, the second solenoid reversing valve is energized and the first solenoid reversing valve is de-energized; the high-pressure oil flows to the motor under test through the second solenoid reversing valve, the third two-way cartridge valve, and the first oil pressure port of the loading module, and then flow back to the oil tank through the first oil inlet of the loading module and the first two-way cartridge valve.

2. The digital hydraulic motor test bench according to claim 1, characterized in that: The direction control circuit is used to determine the flow direction of the high-pressure oil based on the performance to be verified of the motor under test, control the high-pressure oil to flow to the motor under test, and control the loading of the motor under test; The loading circuit is used to control the high-pressure oil output by the motor under test to flow back to the oil tank and to control the low-pressure oil transmitted by the driving module to flow to the motor under test through the loading motor.

3. The digital hydraulic motor test bench according to claim 2, characterized in that: The loading circuit includes a hydraulic circuit and a proportional relief valve; wherein the input end of the proportional relief valve is connected to the output end of the hydraulic circuit; The hydraulic circuit is used to control the high-pressure oil flowing through the loading motor to flow to the proportional relief valve; The hydraulic circuit is also used to control the low-pressure oil delivered by the drive module to flow to the loading motor; The proportional relief valve is used to receive the oil delivered by the hydraulic circuit and overflow the oil exceeding the set pressure back to the oil tank.

4. The digital hydraulic motor test bench according to claim 3 is characterized in that: When the motor under test is controlled to load clockwise, the high-pressure oil enters the hydraulic circuit through the second oil inlet of the loading module, passes through the spring chamber of the first one-way valve and the plunger chamber of the fourth one-way valve in sequence, and flows to the proportional relief valve; When the motor under test is controlled to load counterclockwise, the high-pressure oil enters the hydraulic circuit through the second oil pressure port of the loading module, passes through the spring chamber of the second one-way valve and the plunger chamber of the third one-way valve in sequence, and flows to the proportional relief valve.

5. The digital hydraulic motor test bench according to claim 3, characterized in that: When the motor under test is controlled to load clockwise, the low-pressure oil enters the hydraulic circuit and flows to the loading motor through the second oil pressure port of the loading module; When the motor under test is controlled to load counterclockwise, the low-pressure oil enters the hydraulic circuit and flows to the loading motor through the second oil inlet of the loading module.

6. The digital hydraulic motor test bench according to claim 1, characterized in that: The driving module includes a power unit and an oil replenishing unit; wherein the power unit is connected to a direction control circuit in the loading module; and the oil replenishing unit is connected to a loading circuit in the loading module; The power unit is used to provide high-pressure oil to the loading module when verifying the performance of the motor under test; The oil replenishing unit is used to provide low-pressure oil to the loading module when the pressure of the oil outlet of the tested motor is lower than a preset threshold.

7. The digital hydraulic motor test bench according to claim 6, characterized in that: The oil replenishment unit includes a DC speed regulating motor, an oil suction filter, a metering pump, a safety valve, and a high-pressure filter; wherein the DC speed regulating motor is directly connected to the metering pump; the oil suction filter is located at the oil suction end of the metering pump; the metering pump is connected to the high-pressure filter; the safety valve is located between the outlet of the metering pump and the oil tank; The DC speed regulating motor starts and drives the metering pump, the metering pump sucks low-pressure oil from the oil tank through the oil suction filter, and the low-pressure oil passes through the high-pressure filter to reach the loading module; The high-pressure filter is used to remove impurities in the low-pressure oil; The safety valve is used to overflow the excess oil at the outlet of the metering pump back to the oil tank when the outlet pressure of the metering pump is higher than the preset pressure.

8. A method for verifying the performance of a digital hydraulic motor, characterized in that: The digital hydraulic motor performance verification method is applied to the digital hydraulic motor test bench according to any one of claims 1 to 7; the method comprises: Determine the flow direction of the high pressure oil based on the performance to be verified of the motor under test; Applying a load to the motor under test based on the flow direction of the high-pressure oil to control the loading of the motor under test; The performance parameters of the motor under test during the loading process are collected based on sensors, and the performance of the motor under test is verified based on the performance parameters.

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