Digital hydraulic pump test bed and digital hydraulic pump control performance verification method

Abstract

The invention provides a digital hydraulic pump test bed and a digital hydraulic pump control performance verification method. The invention provides a digital hydraulic pump test bed. The digital hydraulic pump test bed comprises a driving module and a loading module, wherein the driving module comprises a tested hydraulic pump, a direct-current adjustable-speed motor, a plurality of couplings and a shock absorber, one ends of the couplings are connected with the tested hydraulic pump, the other ends of the couplings are connected with the direct-current adjustable-speed motor, the shock absorber is connected with the direct-current adjustable-speed motor, and the sensors are installed on the tested hydraulic pump; a plurality of pressure oil ports of the tested hydraulic pump are connected with the loading module, the loading module comprises a bridge loop and a loading loop, the plurality of pressure oil ports are respectively connected with a first series connection point and a second series connection point of the bridge loop, and a parallel connection point of the bridge loop is connected to the loading loop. The digital hydraulic pump test bed and the digital hydraulic pump control performance verification method are used for verifying the key control performance of the digital hydraulic pump and are wide in application range.

Description

Technical Field

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

[0002] The digital hydraulic pump is the core component of the hydraulic system, and its performance directly affects the efficiency, stability and reliability of the entire system. Through the control performance test, the operating characteristics of the digital hydraulic pump under different working conditions can be evaluated, including key parameters such as flow, pressure, efficiency, response time and dynamic performance. Secondly, the digital hydraulic pump adopts advanced electronic control technology, and the control performance test can verify the accuracy and response speed of its control algorithm, thereby ensuring the efficiency and accuracy of the system in practical applications. The control performance test can also help discover potential design defects and operating problems, and provide data support for improving the design and optimizing the control strategy. Ultimately, these test results can guide the selection and application of digital hydraulic pumps and improve the overall performance and reliability of engineering projects. Therefore, it is essential to conduct control performance tests on digital hydraulic pumps.

[0003] At present, the control performance test of digital hydraulic pumps is mainly based on the traditional digital hydraulic pump test bench, but its application scope is single, it cannot take into account both open and closed pumps, and it cannot verify the key control performance of digital hydraulic pumps, lacking the performance verification function of digital hydraulic pumps. Therefore, there is an urgent need for a digital hydraulic pump test bench that can verify the key control performance of digital hydraulic pumps and has a wide range of applications. Summary of the invention

[0004] In view of this, the present application provides a digital hydraulic pump test bench and a digital hydraulic pump control performance verification method, which are used to verify the key control performance of a digital hydraulic pump and have a wide range of applications.

[0005] Specifically, the present application is implemented through the following technical solutions: The first aspect of the present application provides a digital hydraulic pump test bench, which includes a driving module and a loading module; wherein the driving module includes a hydraulic pump to be tested, a DC speed regulating motor, a plurality of couplings, and a shock absorber, and is used to provide high-pressure oil to the loading module when the performance of the hydraulic pump to be tested is verified; the hydraulic pump to be tested is provided with an oil pressure port, and the oil pressure port is connected to the loading module; one end of the plurality of couplings is connected to the hydraulic pump to be tested, and the other end is connected to the DC speed regulating motor; the shock absorber is connected to the DC speed regulating motor; a plurality of sensors are installed on the hydraulic pump to be tested, and the type of the sensor is determined according to the type of the hydraulic pump to be tested and the performance to be verified; the sensor is used to collect performance parameters of the hydraulic pump to be tested during the loading process, wherein the performance parameters are used to perform performance verification on the hydraulic pump to be tested; The oil pressure port of the hydraulic pump under test is connected to a loading module, and the loading module includes a bridge circuit and a loading circuit. The plurality of oil pressure ports are respectively connected to a first series connection point and a second series connection point of the bridge circuit, and the parallel connection point of the bridge circuit is connected to the loading circuit. The loading module is used to determine a flow direction of the high-pressure oil based on the performance to be verified of the hydraulic pump under test, apply a load to the hydraulic pump under test based on the flow direction of the high-pressure oil, and control the loading of the hydraulic pump under test.

[0006] A second aspect of the present application provides a method for verifying the control performance of a digital hydraulic pump, the method being applied to any one of the digital hydraulic pump test benches provided in the first aspect of the present application; the method comprising: Determine the flow direction of the high-pressure oil based on the performance to be verified of the hydraulic pump under test; Applying a load to the hydraulic pump under test based on the flow direction of the high-pressure oil, and controlling the loading of the hydraulic pump under test; The performance parameters of the hydraulic pump under test during the loading process are collected based on sensors, and the performance of the hydraulic pump under test is verified based on the performance parameters.

[0007] The digital hydraulic pump test bench and digital hydraulic pump control performance verification method provided by the present application, in the first aspect, a DC speed regulating motor is used as a driving device, which can realize speed closed-loop control, improve the accuracy of the high-pressure oil output by the tested hydraulic pump, and can test the optimal speed range of the tested hydraulic pump, thereby improving the accuracy and reliability of the control performance verification of the tested hydraulic pump. In the second aspect, by designing a shock absorber, the vibration generated during the operation of the DC speed regulating motor can be reduced, thereby reducing the interference to the tested hydraulic pump, and improving the accuracy and reliability of the control performance verification of the tested hydraulic pump. In the third aspect, by setting the hydraulic pump test bench as a drive module and a loading module, the tested hydraulic pump is installed on the drive module, and the drive module provides high-pressure oil to the loading module. The loading module applies a load to the tested hydraulic pump based on the performance to be verified of the tested hydraulic pump to control the loading of the tested hydraulic pump, which can accurately adjust the working load of the tested hydraulic pump, thereby controlling the output pressure and flow of the tested hydraulic pump, avoiding idling or overspeeding of the tested hydraulic pump, and improving stability. In addition, based on the sensors installed on the hydraulic pump under test, the performance parameters of the hydraulic pump under test during the loading process are collected in real time. Subsequently, the performance of the hydraulic pump under test can be verified based on the performance parameters corresponding to the performance to be verified and the performance verification method, thereby realizing the verification of the key control performance of the hydraulic pump and realizing new functions such as multi-source state detection and life prediction of the hydraulic pump, providing test conditions for factory testing and research and development of new hydraulic pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A structural schematic diagram of a first embodiment of a digital hydraulic pump test bench provided in this application; Figure 2 This is a schematic diagram of the structure of a driving module shown in an exemplary embodiment of the present application; Figure 3 This is a schematic diagram of the structure of a loading module shown in an exemplary embodiment of the present application; Figure 4 This is a schematic structural diagram of an oil replenishment module according to an exemplary embodiment of the present application; Figure 5 A flow chart of a first embodiment of a digital hydraulic pump performance verification method provided in this application; Description of reference numerals: 1.25: DC speed regulating motor 2: Shock absorber 3, 5: Coupling 4: Torque sensor 6, 17: Proportional relief valve 7: Speed ​​sensor 8: Swing angle sensor 9: Hydraulic pump under test 10: Vibration sensor 11, 14: Temperature sensor 12, 13, 16, 20: One-way valve 15, 21: High pressure sensor 18: Pressure valve cover 19: Solenoid reversing seat valve 22: Low pressure sensor 23: Flow meter 24: Two-way logic unit 26: Safety valve 27: High pressure filter 28: Dosing pump 29: Oil suction filter DETAILED DESCRIPTION

[0009] 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.

[0010] 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.

[0011] 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".

[0012] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0013] Figure 1 This is a structural diagram of the first embodiment of the digital hydraulic pump test bench provided in this application. Figure 1, the digital hydraulic pump test bench provided in this embodiment, the hydraulic pump test bench includes a driving module and a loading module; wherein the driving module includes a hydraulic pump under test, a DC speed regulating motor, a plurality of couplings, and a shock absorber, and is used to provide high-pressure oil to the loading module when verifying the performance of the hydraulic pump under test, the hydraulic pump 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 hydraulic pump under test, and the other end is connected to the DC speed regulating motor, the shock absorber is connected to the DC speed regulating motor, and a plurality of sensors are installed on the hydraulic pump under test, the type of the sensor is determined according to the type of the hydraulic pump under test and the performance to be verified, and the sensor is used to collect the performance parameters of the hydraulic pump under test during the loading process, wherein the performance parameters are used to verify the performance of the hydraulic pump under test; The oil pressure port of the hydraulic pump under test is connected to a loading module, and the loading module includes a bridge circuit and a loading circuit. The plurality of oil pressure ports are respectively connected to a first series connection point and a second series connection point of the bridge circuit, and the parallel connection point of the bridge circuit is connected to the loading circuit. The loading module is used to determine a flow direction of the high-pressure oil based on the performance to be verified of the hydraulic pump under test, apply a load to the hydraulic pump under test based on the flow direction of the high-pressure oil, and control the loading of the hydraulic pump under test.

[0014] For details, please refer to Figure 1 The digital hydraulic pump test bench includes a driving module and a loading module. The driving module includes a hydraulic pump under test, a DC speed regulating motor, multiple couplings, and a shock absorber. The hydraulic pump under test is installed on the driving module, one end of the multiple couplings is connected to the hydraulic pump under test, and the other end of the multiple couplings is connected to the DC speed regulating motor. The shock absorber is connected to the DC speed regulating motor. Multiple sensors are installed on the hydraulic pump under test, and an oil pressure port is provided on the hydraulic pump under test, and the oil pressure port of the hydraulic pump under test is connected to the loading module.

[0015] It should be noted that the tested hydraulic pumps mentioned in this application are all digital hydraulic pumps.

[0016] Furthermore, the multiple sensors installed on the hydraulic pump under test are of multiple types. These multiple types of sensors are installed on the hydraulic pump under test at the same time to monitor the performance parameters of the hydraulic pump under test during the loading process in real time. When determining the performance to be verified of the hydraulic pump 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.

[0017] Furthermore, the driving module is used to provide high-pressure oil to the loading module when verifying the performance of the tested hydraulic pump. 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 tested hydraulic pump, apply a load to the tested hydraulic pump based on the flow direction, and control the loading of the tested hydraulic pump.

[0018] In specific implementation, when it is necessary to verify the performance to be verified of the hydraulic pump under test, the driving module generates high-pressure oil through driving action, and transmits the generated high-pressure oil to the loading module. After receiving the high-pressure oil transmitted by the driving module, the loading module determines the flow direction of the high-pressure oil based on the performance to be verified of the hydraulic pump under test, and applies a load to the hydraulic pump under test based on the determined flow direction to control the loading of the hydraulic pump under test. During the loading process of the hydraulic pump under test, the sensor collects the performance parameters of the hydraulic pump under test in real time. Based on the performance to be verified of the hydraulic pump under test, the performance parameters that need to be collected and the corresponding sensor type are determined, and the performance of the hydraulic pump under test is verified based on the performance parameters collected by the sensor of this sensor type.

[0019] The specific structure of each module of the digital hydraulic pump test bench is introduced below.

[0020] Figure 2 This is a schematic diagram of the structure of a driving module shown in an exemplary embodiment of the present application. Figure 2 The driving module includes a hydraulic pump 9 under test, a DC speed regulating motor 1, a shock absorber 2, a coupling 3, a coupling 5, and a proportional solenoid valve 6. The hydraulic pump 9 under test is connected to the DC speed regulating motor 1 through the coupling 3 and the coupling 5; a plurality of sensors are installed on the hydraulic pump 9 under test; the proportional solenoid valve 6 is connected to the hydraulic pump 9 under test; and the shock absorber 2 is connected to the DC speed regulating motor 1.

[0021] 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 driving module, multiple sensors include a speed sensor 7, a torque sensor 4, a swing angle sensor 8, and a vibration sensor 10.

[0022] Furthermore, the speed sensor 7 monitors the output speed of the DC speed regulating motor 1, that is, the input speed of the hydraulic pump 9 under test, and adjusts and controls the speed of the DC speed regulating motor 1 based on the magnitude relationship between the output speed and the preset speed, ensuring that the input speed of the hydraulic pump 9 under test is within the preset speed range, thereby improving the accuracy of the output flow of the hydraulic pump under test. The torque sensor 4 monitors the output torque of the DC speed regulating motor 1, that is, the input torque of the hydraulic pump 9 under test, and evaluates the mechanical properties and energy conversion efficiency of the hydraulic pump 9 under test by comparing with the input power. The swing angle sensor 8 monitors the swash plate angle of the hydraulic pump 9 under test, and adjusts and controls the swash plate position of the hydraulic pump 9 under test based on the magnitude relationship between the output angle and the preset angle, thereby improving the accuracy of the output flow of the hydraulic pump 9 under test. The vibration sensor 10 is a three-axis vibration sensor, which is connected to the hydraulic pump 9 under test by magnetic attraction, and monitors the radial vibration and axial vibration of the hydraulic pump 9 under test in real time, so as to evaluate the working state of the hydraulic pump 9 under test, monitor potential faults, and provide an important basis for the life prediction of the hydraulic pump 9 under test.

[0023] Furthermore, the DC speed regulating motor 1 is used to drive the hydraulic pump 9 under test. 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 hydraulic pump 9 under test. The hydraulic pump 9 under test is used to provide stable high-pressure oil according to the driving speed of the DC speed regulating motor 1. The shock absorber 2 is used to absorb and reduce the vibration generated during the operation of the DC speed regulating motor 1 to protect the hydraulic pump 9 under test. The proportional solenoid valve 6 is used to adjust the flow or pressure of the hydraulic oil according to the control signal of the system, accurately control the flow output by the hydraulic pump 9 under test, and ensure that the performance test of the hydraulic pump 9 under test is carried out within the set range.

[0024] In specific implementation, the DC speed regulating motor 1 starts and drives the hydraulic pump 9 under test to operate. The speed of the DC speed regulating motor 1 can be adjusted to control the flow output of the hydraulic pump 9 under test. The shock absorber 2 absorbs and reduces the vibration generated when the DC speed regulating motor 1 is running. The coupling 3 and the coupling 5 transmit the rotational motion of the DC speed regulating motor 1 to the hydraulic pump 9 under test. Driven by the DC speed regulating motor 1, the hydraulic pump 9 under test outputs high-pressure oil. The sensor monitors the operating status of the hydraulic pump 9 under test (such as speed, pressure, flow, and swash plate angle) in real time and feeds the data back to the control system. The proportional solenoid valve 6 adjusts the flow or pressure of the high-pressure oil output by the hydraulic pump 9 under test according to the control signal of the system to ensure that the performance test of the hydraulic pump 9 under test is carried out within the set range.

[0025] The digital hydraulic pump 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 hydraulic pump, and can test the optimal speed range of the tested hydraulic pump, thereby improving the accuracy and reliability of the control performance verification of the tested hydraulic pump. On the other hand, by designing a proportional solenoid valve and a sensor, the high-pressure oil output by the tested hydraulic pump can be monitored and adjusted in real time, thereby ensuring that the pressure of the tested hydraulic pump is within the set range, and preventing pressure overshoot caused by system overload or failure of the tested hydraulic pump. On the third hand, by designing a shock absorber, the vibration generated by the DC speed regulating motor during operation can be reduced, thereby reducing interference with the tested hydraulic pump, thereby improving the accuracy and reliability of the control performance verification of the tested hydraulic pump.

[0026] Figure 3 This is a schematic diagram of the structure of a loading module shown in an exemplary embodiment of the present application. Figure 3 The loading module includes a bridge circuit and a loading circuit. Multiple oil pressure ports of the tested hydraulic pump are respectively connected to the first series connection point and the second series connection point of the bridge circuit, and the parallel connection point of the bridge circuit is connected to the loading circuit.

[0027] Furthermore, the bridge circuit determines the flow direction of the high-pressure oil based on the performance to be verified of the tested hydraulic pump 9, and controls the high-pressure oil to flow to the loading circuit. The loading circuit applies a load to the tested hydraulic pump 9 based on the flow direction of the high-pressure oil, and controls the loading of the tested hydraulic pump 9.

[0028] Specifically, the bridge circuit includes multiple one-way valves, which work together to control the bidirectional flow of high-pressure oil. Figure 3 , the multiple one-way valves include one-way valve 12, one-way valve 13, one-way valve 16, and one-way valve 20. Among them, one-way valve 12 and one-way valve 13 are connected in series, and their series connection point is a first series connection point. One-way valve 16 and one-way valve 20 are connected in series, and their series connection point is a second series connection point. One-way valve 12 and one-way valve 16 are connected in parallel, and their connection point is a parallel connection point, which is located at the same end of the bridge loop. One-way valve 13 and one-way valve 20 are connected in parallel, and their connection point is a parallel connection point, which is located at the other end of the bridge loop.

[0029] For further information, please refer to Figure 3, multiple high-pressure sensors are arranged on the pressure circuit of the bridge circuit. Among them, the high-pressure sensor 15 is connected to the second oil inlet P2 of the loading module, and the high-pressure sensor 21 is connected to the first oil inlet P3 of the loading module. Multiple high-pressure sensors work together to monitor the output pressure of the tested hydraulic pump 9, and feed back the measured pressure data to the control system for closed-loop control of the loading pressure. In the closed-loop control system, the actual pressure value is compared with the set pressure value. If the deviation exceeds the set range, the control system will adjust the proportional relief valve or other control elements to keep the pressure within the preset range to ensure the accuracy of the loading process. A low-pressure sensor 22 and a flowmeter 23 are arranged on the return oil circuit of the bridge circuit. The low-pressure sensor 22 is connected to the output end of the bridge circuit, and the flowmeter 23 is connected to the output end of the bridge circuit. The low-pressure sensor 22 is used to monitor the back pressure in the return oil circuit (i.e., the oil pressure before returning to the tested hydraulic pump) to ensure that the back pressure is within a safe range to prevent excessive or low back pressure from affecting the normal operation of the hydraulic system or damaging the hydraulic components. The flow meter 23 is used to monitor the oil flow rate on the oil return circuit (i.e. the amount of oil before returning to the hydraulic pump) to ensure that the oil volume is within a safe range. A plurality of temperature sensors are provided in the bridge circuit. Among them, the temperature sensor 11 is connected to the second oil inlet P2 of the loading module, and the temperature sensor 14 is connected to the first oil inlet P3 of the loading module. A plurality of temperature sensors work together to monitor the temperature of the high-pressure oil output by the tested hydraulic pump 9, and based on the relationship between the temperature and the preset temperature, the temperature of the high-pressure oil is adjusted so that the high-pressure oil is always within the set viscosity range. It should be noted that the viscosity of the high-pressure oil will change with the change of temperature. The feedback signal provided by the temperature sensor can be used to adjust the temperature control system to keep the temperature of the high-pressure oil within the set range, thereby ensuring the stability of the viscosity of the high-pressure oil.

[0030] It should be noted that the performance to be verified of the tested hydraulic pump 9 is different, the flow direction of the high-pressure oil is also different, and the loading direction of the tested hydraulic pump 9 is also different.

[0031] In a specific implementation, in a possible implementation, when the tested hydraulic pump 9 is controlled to load forward, the oil pressure port P1 of the tested hydraulic pump 9 is connected to the first oil inlet P3 of the loading module. The one-way valve 12 is closed (to prevent the high-pressure oil from flowing to the oil replenishment circuit or the reverse circuit), the one-way valve 13 is opened (to allow the high-pressure oil to flow to the one-way valve 20), the one-way valve 20 is opened, and the one-way valve 16 is closed (to prevent the high-pressure oil from entering the circuit in the reverse direction). The high-pressure oil enters the loading circuit through the oil pressure port P1, the first oil inlet P3, the one-way valve 13, and the one-way valve 20 in sequence, and flows to the oil tank through the second oil inlet P2.

[0032] In another possible implementation, when the tested hydraulic pump 9 is controlled to be reverse loaded, the oil pressure port P1 of the tested hydraulic pump 9 is connected to the second oil inlet P4 of the loading module. The one-way valve 12 is opened (allowing the high-pressure oil to flow to the one-way valve 20), the one-way valve 13 is closed (preventing the high-pressure oil from flowing to the one-way valve 20), the one-way valve 16 is opened (allowing the high-pressure oil to flow to the reverse direction of the bridge circuit after passing through the one-way valve 13), and the one-way valve 20 is closed (preventing the high-pressure oil from flowing back from the bridge circuit to P3 of the loading module). The high-pressure oil enters the loading circuit through the oil pressure port P1, the second oil inlet P4, the one-way valve 12, and the one-way valve 20 in sequence, and flows back to the oil tank through the second oil inlet P2.

[0033] The digital hydraulic pump test bench provided in this embodiment, when setting up the bridge circuit, firstly, through the configuration of multiple one-way valves, the bidirectional flow of high-pressure oil can be realized. That is, no matter from which direction the high-pressure oil enters the bridge circuit, the expected flow path will be realized through the one-way valves in series and parallel, so that the loading module can support bidirectional loading and control, and realize the bidirectional loading of the hydraulic pump under test. Secondly, by controlling the flow direction of the high-pressure oil through the bridge circuit, various working conditions of the hydraulic pump under test in actual application can be simulated, and the performance of the hydraulic pump under test under various working conditions can be fully verified. Moreover, the working conditions can be quickly adjusted according to different verification requirements without changing the equipment, reducing the need for additional test equipment, having high flexibility, helping to save resources and reduce testing costs, improving the accuracy and reliability of performance verification, and realizing refined performance analysis and fault diagnosis. Thirdly, through the multiple one-way valves in the bridge circuit, it is possible to effectively prevent the occurrence of unexpected reverse flow in the bridge circuit, protect the hydraulic pump under test and other equipment from damage, and ensure the safe operation of the system. It can also balance the pressure in two different directions. No matter which direction the high-pressure oil flows in, the bridge circuit can reduce pressure shock through reasonable oil distribution and pressure regulation, thereby reducing the mechanical stress on pipelines and equipment and extending the life of system components.

[0034] For details, please continue to refer to Figure 3 The loading circuit includes a two-way logic unit 24, a proportional relief valve 17, a pressure valve cover plate 18, and an electromagnetic reversing seat valve 19; wherein, the oil inlet of the electromagnetic reversing seat valve 19 is connected to the oil outlet of the bridge circuit; the oil outlet of the electromagnetic reversing seat valve 19 is connected to the oil inlet of the proportional relief valve 17; the outlet of the proportional relief valve 17 is connected to the oil inlet of the pressure valve cover plate 18; the outlet of the pressure valve cover plate 18 is connected to the oil return port and the oil tank; the input end of the two-way logic unit 24 is connected to the pressure valve cover plate 18, and the output end is connected to the proportional relief valve 17 and the electromagnetic reversing seat valve 19.

[0035] Furthermore, the pressure valve cover plate 18 is used to close the pressure valve and send the pressure signal collected by the low pressure sensor 22 to the two-way logic unit 24. The two-way logic unit 24 controls the state of the proportional relief valve 17 and the electromagnetic reversing seat valve 19 based on the pressure signal sent by the pressure valve cover plate 18; the electromagnetic reversing seat valve 19 is used to control the flow direction of the high-pressure oil, adjust the flow direction of the high-pressure oil based on the control of the two-way logic unit 24, and perform loading or unloading operations; the proportional relief valve 17 is used to adjust the pressure of the loading circuit based on the control of the two-way logic unit 24.

[0036] In specific implementation, the high-pressure oil enters the two-way logic unit 24 through the bridge circuit, passes through the proportional relief valve 17, the pressure valve cover plate 18 and the electromagnetic reversing seat valve 19 in sequence, and is ready for loading. When the pressure of the high-pressure oil reaches the set pressure of the proportional relief valve 17, the overflow process begins, and a pressure difference is established at both ends of the valve core of the two-way logic unit 24. The valve core rises, and the high-pressure oil in the loading circuit begins to overflow at the set pressure, thereby entering the loading condition.

[0037] The digital hydraulic pump 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 load applied to the hydraulic pump under test according to the set value, so as to achieve high-precision pressure control and ensure that the load pressure applied to the hydraulic pump under test is accurate. On the other hand, by flexibly adjusting the pressure, the working conditions of the hydraulic pump under test under different pressure conditions, such as normal operation, pressure shock and system vibration, can be simulated. On the third hand, the proportional relief valve monitors the pressure of the high-pressure oil flowing to the hydraulic pump under test 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.

[0038] It should be noted that the tested hydraulic pump includes an open circuit and a closed circuit. In the open circuit, the hydraulic oil is sucked from the oil tank (oil storage tank), and is delivered to the actuator (such as a hydraulic cylinder or hydraulic motor) after being pressurized by the tested hydraulic pump. After the actuator completes the execution, the hydraulic oil is delivered back to the oil tank, and the hydraulic oil is cooled and filtered through the oil tank for recycling. In the closed circuit, the oil pressure port of the tested hydraulic pump is directly connected to the oil inlet of the hydraulic motor, and the oil return port of the hydraulic motor is directly connected to the oil inlet of the tested hydraulic pump. The hydraulic oil circulates between the tested hydraulic pump and the actuator, and does not return directly to the oil tank.

[0039] The tested hydraulic pump in the above-mentioned embodiment is mainly aimed at the case where the tested hydraulic pump is an open pump. When the tested hydraulic pump is a closed pump, the hydraulic pump test bench further includes an oil replenishing module.

[0040] Specifically, when the hydraulic pump 9 under test is a closed circuit, the digital hydraulic pump test bench further includes an oil replenishing module, wherein the oil replenishing module is connected to the loading module, and the oil replenishing module is used to provide low-pressure oil to the loading module when the outlet pressure of the hydraulic pump 9 under test is lower than a preset value.

[0041] Figure 4 This is a schematic diagram of the principle of the oil replenishment module shown in an exemplary embodiment of the present application. Figure 4 The oil replenishment module includes a DC speed regulating motor 25, a safety valve 26, a high-pressure filter 27, a metering pump 28 and an oil suction filter 29; wherein the DC speed regulating motor 25 is connected to the metering pump 28; the oil suction filter 29 is located at the oil suction end of the metering pump 28; the metering pump 28 is connected to the high-pressure filter 27; the safety valve 26 is located between the outlet of the metering pump 28 and the oil tank.

[0042] Furthermore, the DC speed regulating motor 25 starts and drives the metering pump 28, which sucks low-pressure oil from the oil tank through the oil suction filter 29, and the low-pressure oil reaches the loading module through the high-pressure filter 27; the high-pressure filter 27 is used to remove impurities in the low-pressure oil, and the safety valve 26 is used to overflow the excess oil at the outlet of the metering pump 28 back to the oil tank when the outlet pressure of the metering pump 28 is higher than the preset pressure.

[0043] The digital hydraulic pump test bench provided in this embodiment provides a low-pressure oil to the loading module by setting the oil replenishment module when the hydraulic pump under test is a closed pump and the outlet pressure of the hydraulic pump under test is lower than the preset value, thereby providing sufficient load to the hydraulic pump under test. On the one hand, since the quantitative pump can overcome the pressure difference in the closed circuit and inject the low-pressure oil into the closed circuit, the insufficient oil caused by leakage, expansion or other reasons can be supplemented, ensuring that the closed pump can maintain normal oil circulation, effectively preventing the suction phenomenon, and ensuring the normal operation and stability of the hydraulic pump under test. In addition, the DC speed regulating motor can adjust the output flow of the quantitative pump according to the real-time demand of the quantitative pump, so as to accurately supplement the required low-pressure oil, so that the oil replenishment module can flexibly provide the required amount of oil. On the other hand, during the performance verification process, the oil replenishment module can automatically replenish the low-pressure oil to the loading module when the outlet pressure of the hydraulic pump under test is lower than the preset value, ensuring the smooth progress of the performance verification, reducing the situation of operation interruption, improving the test efficiency, and improving the test accuracy. Thirdly, the hydraulic pump test bench takes into account both open pumps and closed pumps, and has a wide range of applications. When different hydraulic pumps need to be verified, there is no need to switch to other hydraulic pump test benches, which is more convenient and improves test efficiency.

[0044] The digital hydraulic pump 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 low-pressure oil output by the metering pump, and can test the optimal speed range of the metering pump, thereby improving the accuracy and reliability of the control performance verification of the tested hydraulic pump. On the other hand, by designing a safety valve and a high-pressure filter to monitor and adjust the low-pressure oil output by the metering pump in real time, it can ensure that the pressure of the metering pump is within the set range, and prevent pressure overshoot caused by system overload or metering pump failure. On the third hand, by setting a high-pressure filter and an oil suction filter, the cleanliness of the low-pressure oil can be guaranteed, reducing interference with the performance verification results.

[0045] The digital hydraulic pump test bench provided in this embodiment, firstly, uses 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 hydraulic pump, and can test the optimal speed range of the tested hydraulic pump, thereby improving the accuracy and reliability of the control performance verification of the tested hydraulic pump. Secondly, by designing a shock absorber, the vibration generated during the operation of the DC speed regulating motor can be reduced, thereby reducing the interference to the tested hydraulic pump, and improving the accuracy and reliability of the control performance verification of the tested hydraulic pump. Thirdly, by setting the hydraulic pump test bench as a driving module and a loading module, the tested hydraulic pump is installed on the driving module, and the driving module provides high-pressure oil to the loading module. The loading module applies a load to the tested hydraulic pump based on the performance to be verified of the tested hydraulic pump to control the loading of the tested hydraulic pump, and the working load of the tested hydraulic pump can be accurately adjusted, thereby controlling the output pressure and flow of the tested hydraulic pump, avoiding idling or overspeeding of the tested hydraulic pump, and improving stability. In addition, the performance parameters of the tested hydraulic pump during the loading process are collected in real time based on the sensors installed on the tested hydraulic pump. In the future, the tested hydraulic pump can be verified based on the performance parameters corresponding to the performance to be verified and the performance verification method, which realizes the verification of the key control performance of the hydraulic pump, and realizes new functions such as multi-source state detection and life prediction of the hydraulic pump, providing test conditions for the factory test and research and development of new hydraulic pumps. Fourthly, when the tested hydraulic pump is a closed pump, the hydraulic pump test bench is also equipped with an oil replenishment module to provide low-pressure oil to the loading module, which can prevent the occurrence of cavitation and ensure the normal operation and stability of the tested hydraulic pump. Compared with the traditional hydraulic pump test bench, it takes into account both open and closed pumps, and has a wide range of applications. When different hydraulic pumps need to be verified, there is no need to switch to other hydraulic pump test benches, which is more convenient, improves the test efficiency, and is more conducive to production application. Fifthly, by determining the flow direction of different high-pressure oils based on the performance to be verified, and then controlling the loading of the hydraulic pump under test based on different flow directions to perform performance verification based on the performance parameters during the loading process, various working conditions of the hydraulic pump under test in actual applications can be simulated, and the performance of the hydraulic pump under test under various working conditions can be fully verified. The working conditions can be quickly adjusted according to different verification requirements without the need to replace equipment, reducing the need for additional testing 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.

[0046] Corresponding to the aforementioned embodiment of a digital hydraulic pump test bench, the present application also provides an embodiment of a digital hydraulic pump control performance verification method.

[0047] Figure 5 This is a flow chart of the first embodiment of the digital hydraulic pump control performance verification method provided by this application. Please refer to Figure 5The method provided in this embodiment is applied to the digital hydraulic pump test bench described in any one of the present applications; the method comprises: S501. Determine the flow direction of the high-pressure oil based on the performance to be verified of the tested hydraulic pump.

[0048] Specifically, the flow direction of the high-pressure oil is related to the performance to be verified of the hydraulic pump under test.

[0049] S502: Apply a load to the hydraulic pump under test based on the flow direction of the high-pressure oil to control the loading of the hydraulic pump under test.

[0050] Specifically, the direction of the load applied to the hydraulic pump under test is consistent with the flow direction of the high-pressure oil.

[0051] In this step, a load in the same direction as the flow direction of the high-pressure oil is applied to the hydraulic pump under test, and the hydraulic pump under test is controlled to be loaded.

[0052] S503: collecting performance parameters of the tested hydraulic pump during loading based on sensors, and performing performance verification on the tested hydraulic pump based on the performance parameters.

[0053] 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 tested hydraulic pump corresponds to specific performance parameters, which need to be collected based on specific types of sensors.

[0054] In this step, the performance parameters to be collected are determined based on the performance to be verified of the tested hydraulic pump. Based on the type of sensor corresponding to the performance parameter, the performance parameter recorded on the sensor is read. Based on the performance verification method corresponding to the performance to be verified and the read performance parameter, the performance of the tested hydraulic pump is verified.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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 pump test bench, characterized in that: The digital hydraulic pump test bench includes a driving module and a loading module; wherein the driving module includes a hydraulic pump to be tested, a DC speed regulating motor, a plurality of couplings, and a shock absorber, and is used to provide high-pressure oil to the loading module when the performance of the hydraulic pump to be tested is verified. The hydraulic pump to be tested is provided with an oil pressure port, and the oil pressure port is connected to the loading module. One end of the plurality of couplings is connected to the hydraulic pump to be tested, and the other end is connected to the DC speed regulating motor. The shock absorber is connected to the DC speed regulating motor. A plurality of sensors are installed on the hydraulic pump to be tested, and the type of the sensor is determined according to the type of the hydraulic pump to be tested and the performance to be verified. The sensor is used to collect the performance parameters of the hydraulic pump to be tested during the loading process, wherein the performance parameters are used to perform performance verification on the hydraulic pump to be tested; The oil pressure port of the hydraulic pump under test is connected to a loading module, and the loading module includes a bridge circuit and a loading circuit. The plurality of oil pressure ports are respectively connected to a first series connection point and a second series connection point of the bridge circuit, and the parallel connection point of the bridge circuit is connected to the loading circuit. The loading module is used to determine a flow direction of the high-pressure oil based on the performance to be verified of the hydraulic pump under test, apply a load to the hydraulic pump under test based on the flow direction of the high-pressure oil, and control the loading of the hydraulic pump under test.

2. The digital hydraulic pump test bench according to claim 1, characterized in that: The bridge circuit determines the flow direction of the high-pressure oil based on the performance to be verified of the tested hydraulic pump, and controls the high-pressure oil to flow toward the loading circuit; The loading circuit applies a load to the hydraulic pump under test based on the flow direction of the high-pressure oil to control the loading of the hydraulic pump under test.

3. The digital hydraulic pump test bench according to claim 2, characterized in that: The bridge circuit includes multiple one-way valves, which work together to control the bidirectional flow of the high-pressure oil; wherein the first one-way valve and the second one-way valve are connected in series, the third one-way valve and the fourth one-way valve are connected in series, the first one-way valve and the third one-way valve are connected in parallel, and the second one-way valve and the fourth one-way valve are connected in parallel.

4. The digital hydraulic pump test bench according to claim 3, characterized in that: When the tested hydraulic pump is controlled to load forward, the first one-way valve is closed, the second one-way valve is opened, and the fourth one-way valve is opened, and the high-pressure oil enters the loading circuit through the first oil inlet, the second one-way valve, and the fourth one-way valve, and flows to the oil tank through the second oil inlet; When the tested hydraulic pump is controlled to be reverse loaded, the first one-way valve is opened, the second one-way valve is closed, and the third one-way valve is opened. The high-pressure oil enters the loading circuit through the second oil inlet, the first one-way valve, and the third one-way valve, and flows to the oil tank through the first oil inlet.

5. The digital hydraulic pump test bench according to claim 2, characterized in that: The loading circuit includes a two-way logic unit, a proportional relief valve, a pressure valve cover plate, and an electromagnetic reversing seat valve; wherein, the oil inlet of the electromagnetic reversing seat valve is connected to the oil outlet of the bridge circuit; the oil outlet of the electromagnetic reversing seat valve is connected to the oil inlet of the proportional relief valve; the outlet of the proportional relief valve is connected to the oil inlet of the pressure valve cover plate; the outlet of the pressure valve cover plate is connected to the oil return port and the oil tank; the input end of the two-way logic unit is connected to the pressure valve cover plate, and the output end is connected to the proportional relief valve and the electromagnetic reversing seat valve.

6. The digital hydraulic pump test bench according to claim 5, characterized in that: The pressure valve cover plate is used to close the pressure valve and send the pressure signal collected by the low-pressure sensor to the two-way logic unit; The two-way logic unit controls the states of the proportional relief valve and the electromagnetic reversing seat valve based on the pressure signal sent by the pressure valve cover plate; The electromagnetic reversing seat valve is used to control the flow direction of the high-pressure oil, and adjusts the flow direction of the high-pressure oil based on the control of the two-way logic unit to perform loading or unloading operations; The proportional relief valve is used to adjust the pressure of the loading circuit based on the control of the two-way logic unit.

7. The digital hydraulic pump test bench according to claim 1, characterized in that: When the hydraulic pump under test is a closed circuit, the hydraulic pump test bench further includes an oil replenishing module; wherein the oil replenishing module is connected to the loading module; The oil replenishment module is used to provide low-pressure oil to the loading module when the outlet pressure of the tested hydraulic pump is lower than a preset value.

8. The digital hydraulic pump test bench according to claim 7, characterized in that: The oil replenishment module includes a DC speed regulating motor, a safety valve, a high-pressure filter, a metering pump and an oil suction filter; wherein the DC speed regulating motor is 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; and the safety valve is located between the outlet of the metering pump and the oil tank.

9. The digital hydraulic pump test bench according to claim 8, characterized in that: 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.

10. A method for verifying the control performance of a digital hydraulic pump, characterized in that: The digital hydraulic pump control performance verification method is applied to the digital hydraulic pump test bench according to any one of claims 1 to 9; the method comprises: Determine the flow direction of the high-pressure oil based on the performance to be verified of the hydraulic pump under test; Applying a load to the hydraulic pump under test based on the flow direction of the high-pressure oil, and controlling the loading of the hydraulic pump under test; The performance parameters of the hydraulic pump under test during the loading process are collected based on sensors, and the performance of the hydraulic pump under test is verified based on the performance parameters.

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