A digital oil cylinder test bench and a digital oil cylinder performance verification method

Abstract

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

Description

Technical Field

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

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

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

[0004] In view of this, the present application provides a digital cylinder test bench and a digital cylinder performance verification method to verify the key control performance of the digital cylinder.

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

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

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

[0008] The second aspect of the present application provides a digital cylinder performance verification method, which is applied to the digital cylinder test bench provided in the first aspect of the present application; the method comprises:

[0009] Determining the flow direction of the high-pressure oil based on the performance to be verified of the digital cylinder being tested, and controlling the high-pressure oil to flow toward the digital cylinder being tested;

[0010] Applying a load to the digital cylinder under test based on the flow direction, and controlling the loading of the digital cylinder under test;

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

[0012] The digital cylinder test bench and digital cylinder performance verification method provided by the present application, on the one hand, use 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 digital cylinder, and can test the optimal speed range of the tested digital cylinder, thereby improving the accuracy and reliability of the control performance verification of the tested digital cylinder. On the other hand, by setting the digital cylinder test bench as a drive module and a verification module, the drive module provides high-pressure oil to the verification module, and the verification module applies a load to the tested digital cylinder based on the performance to be verified of the tested digital cylinder to control the loading of the tested digital cylinder, the workload of the tested digital cylinder can be accurately adjusted, and then the output pressure and flow of the tested digital cylinder can be controlled, so as to avoid idling or overspeeding of the tested digital cylinder and improve stability. In addition, based on the sensors installed on the digital cylinder under test, the performance parameters of the digital cylinder under test during the loading process are collected in real time. Subsequently, the performance of the digital cylinder 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 digital cylinder and realizing new functions such as multi-source state detection and life prediction of the digital cylinder, providing test conditions for factory testing and research and development of new digital cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0016] Figure 4 A flowchart of a first embodiment of a digital cylinder performance verification method provided in this application;

[0017] Description of reference numerals:

[0018] 1.1, 1.2: DC speed regulating motor

[0019] 2: Proportional piston pump

[0020] 3: Flow meter

[0021] 4: Dosing pump

[0022] 5.1, 5.2: High pressure filter

[0023] 6.1, 6.2, 6.3: Pressure sensor

[0024] 7.1, 7.2: Relief valve

[0025] 8: Oil return filter

[0026] 9: High pressure ball valve

[0027] 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8: Two-way cartridge valve

[0028] 11: Pressure plug-in

[0029] 12: Solenoid reversing valve

[0030] 13: Displacement sensor

[0031] 14: Vibration sensor

[0032] 15: Digital cylinder under test

[0033] 16: Force sensor

[0034] 17: Loading digital cylinder

[0035] 18: Proportional relief valve DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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".

[0039] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0040] Figure 1 This is a structural diagram of the first embodiment of the digital cylinder test bench provided in this application. Figure 1 The digital cylinder test bench provided in this embodiment includes a driving module and a verification module; wherein the driving module includes a DC speed regulating motor, which is used to provide high-pressure oil to the verification module when the performance of the digital cylinder under test is verified; the digital cylinder under test is installed on the verification module, and the loading digital cylinder is installed on the verification module; the digital cylinder under test is provided with an oil pressure port, and the loading digital cylinder is provided with an oil pressure port, and a plurality of sensors are installed on the digital cylinder under test, and the type of the sensor is determined according to the type of the digital cylinder under test and the performance to be verified, and the sensor is used to collect the performance parameters of the digital cylinder under test during the loading process, wherein the performance parameters are used to perform performance verification on the digital cylinder under test;

[0041] The verification module includes a direction switching circuit and a loading circuit. The digital cylinder under test is provided with an oil pressure port, and 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 switching circuit; the loading digital cylinder is provided with an oil pressure port, and a plurality of the oil pressure ports are respectively connected to a first series connection point and a second series connection point of the loading circuit; the verification module is used to determine the flow direction of the high-pressure oil based on the performance to be verified of the digital cylinder under test, apply a load to the loading digital cylinder based on the flow direction of the high-pressure oil, and the loading digital cylinder transfers the load to the digital cylinder under test to control the loading of the digital cylinder under test.

[0042] For details, please refer to Figure 1 The digital cylinder test bench includes a driving module and a verification module. The driving module includes a DC speed regulating motor. The digital cylinder under test is installed on the verification module. A plurality of sensors are installed on the digital cylinder under test. The digital cylinder under test is provided with an oil pressure port. The oil pressure port of the digital cylinder under test is connected to the verification module.

[0043] It should be noted that there are multiple types of sensors installed on the digital cylinder under test. These multiple types of sensors are installed on the digital cylinder under test at the same time to monitor the performance parameters of the digital cylinder under test during the loading process in real time. When determining the performance to be verified of the digital cylinder 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.

[0044] Furthermore, the driving module is used to provide high-pressure oil to the verification module when verifying the performance of the digital cylinder under test. The verification module is used to install the digital cylinder under test, determine the flow direction of the high-pressure oil provided by the driving module based on the performance to be verified of the digital cylinder under test, apply a load to the digital cylinder under test based on the flow direction, and control the loading of the digital cylinder under test.

[0045] In specific implementation, when it is necessary to verify the performance of the digital cylinder to be tested, the driving module generates high-pressure oil through driving action and transmits the generated high-pressure oil to the verification module. After receiving the high-pressure oil transmitted by the driving module, the verification module determines the flow direction of the high-pressure oil based on the performance to be verified of the digital cylinder to be tested (it should be noted that the flow direction of the high-pressure oil is different for different performances to be verified), controls the loading of the digital cylinder to be tested through the flow direction of the high-pressure oil, collects the performance parameters of the digital cylinder to be tested based on the sensor installed on the verification module, and performs performance verification on the digital cylinder to be tested based on the performance verification method of the performance to be verified.

[0046] Preferably, in a possible implementation, the performance verification of the digital cylinder under test based on the performance parameters includes: determining target performance parameters and a performance verification method based on the performance to be verified of the digital cylinder under test; the target performance parameters include at least flow data, displacement data, and axial vibration data, and the performance verification method is used to calculate a performance score of the performance to be verified; based on the performance verification method and the target performance parameters, calculating the performance score of the performance to be verified; when the performance score is greater than a preset score, determining that the performance to be verified of the digital cylinder under test is good.

[0047] The specific structure of each module of the digital cylinder test bench will be introduced below.

[0048] 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 power unit, an oil replenishment unit and a flow test unit. The power unit is used to provide high-pressure oil to the verification module when the performance of the digital cylinder under test is verified. The oil replenishment unit is used to provide low-pressure oil to the verification module when the chamber pressure of the digital cylinder under test is lower than a preset threshold. The flow test unit is used to monitor the flow data of the digital cylinder under test in real time during the loading process of the digital cylinder under test.

[0049] For details, please continue to refer to Figure 2 The power unit includes a DC speed regulating motor 1.1, a proportional piston pump 2, a high pressure filter 5.1, a pressure sensor 6.1, and a relief valve 7.1. The DC speed regulating motor 1.1 is directly connected to the proportional piston pump 2 through the motor shaft, the high pressure filter 5.1 is connected to the oil output end of the proportional piston pump 2, the pressure sensor 6.1 is installed after the high pressure filter 5.1, and the relief valve 7.1 is connected in parallel with the pressure sensor 6.1 and the high pressure filter 5.1.

[0050] Furthermore, the DC speed regulating motor 1.1 is used to drive the proportional piston pump 2. 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 to the target value based on the received feedback signal to control the operating speed and oil volume of the proportional piston pump 2. The proportional piston pump 2 is used to provide stable high-pressure oil according to the driving speed of the DC speed regulating motor 1.1. The filtration accuracy of the high-pressure filter 5.1 is 5 microns, which is used to filter impurities and particles in the high-pressure oil output by the proportional piston pump 2 to protect other components from contamination. The pressure sensor 6.1 is used to monitor the pressure of the high-pressure oil output by the proportional piston pump 2 in real time, and adjust the pressure of the high-pressure oil based on the relationship between the pressure of the high-pressure oil and the target pressure. The overflow valve 7.1 is used to set the maximum pressure to prevent pressure overshoot caused by system overload or failure of the proportional piston pump 2.

[0051] In specific implementation, the DC speed regulating motor 1.1 starts and drives the proportional piston pump 2 to operate. The speed of the DC speed regulating motor 1.1 can be adjusted to control the flow output of the proportional piston pump 2. The proportional piston pump 2 outputs high-pressure oil after sucking hydraulic oil from the hydraulic oil tank. The high-pressure oil passes through the relief valve 7.1, and the relief valve 7.1 adjusts the flow of high-pressure oil according to the set pressure value to release excess pressure and prevent the system from over-pressure. Further, the high-pressure oil passes through the high-pressure filter 5.1, and the high-pressure filter 5.1 removes impurities in the high-pressure oil to ensure the cleanliness of the high-pressure oil. The pressure sensor 6.1 monitors the pressure of the high-pressure oil output by the proportional piston pump 2 in real time, and adjusts the speed of the DC speed regulating motor 1.1 based on the relationship between the pressure of the high-pressure oil and the target pressure; when the pressure in the chamber of the digital cylinder under test is higher than the preset pressure set by the relief valve 7.1, the remaining high-pressure oil in the digital cylinder under test flows back to the oil tank from the relief valve 7.1.

[0052] The digital cylinder test bench provided in this embodiment has, on the one hand, a DC speed regulating motor as a driving device, which can realize closed-loop speed control, improve the accuracy of the oil output by the tested digital cylinder, and can test the optimal speed range of the tested digital cylinder, thereby improving the accuracy and reliability of the verification of the control performance of the tested digital cylinder. On the other hand, by designing a pressure sensor to monitor the pressure of the high-pressure oil output by the proportional piston pump in real time, and designing an overflow valve to adjust the high-pressure oil flow rate according to the set pressure value, it can ensure that the system pressure is within the set range, and prevent pressure overshoot caused by system overload or proportional piston pump failure. On the third hand, by setting a high-pressure filter, the cleanliness of the high-pressure oil can be guaranteed, reducing interference with the performance verification results.

[0053] For details, please continue to refer to Figure 2The oil replenishment unit includes a DC speed regulating motor 1.2, a metering pump 4, a high pressure filter 5.2, an overflow valve 7.2, and a high pressure ball valve 9. The DC speed regulating motor 1.2 is connected to the metering pump 4, the metering pump 4 is connected to the high pressure filter 5.2, the high pressure filter 5.2 is connected to the high pressure ball valve 9, and the high pressure ball valve 9 is connected to the overflow valve 7.2.

[0054] Furthermore, the DC speed regulating motor 1.2 is used to drive the metering pump 4. The DC speed regulating motor 1.2 performs closed-loop speed regulation according to its own speed and the set speed, and adjusts its own speed to the target value based on the received feedback signal to control the operating speed and oil volume of the metering pump 4. The metering pump 4 is used to provide a stable low-pressure oil volume according to the driving speed of the DC speed regulating motor 1.2. The high-pressure filter 5.2 is used to filter impurities in the low-pressure oil output by the metering pump 4 to ensure that the low-pressure oil entering the system is clean. The high-pressure ball valve 9 is used to control the flow direction and flow rate of the oil, and can selectively open or close the flow path. The overflow valve 7.2 is used to set the pressure of the oil replenishment unit to prevent the system from overloading.

[0055] In specific implementation, the DC speed regulating motor 1.2 starts and drives the metering pump 4 to operate. The speed of the DC speed regulating motor 1.2 can be adjusted to control the flow output of the metering pump 4. The metering pump 4 sucks hydraulic oil from the hydraulic oil tank, pressurizes it and outputs low-pressure oil. The low-pressure oil passes through the relief valve 7.2, and the relief valve 7.2 adjusts the flow of the low-pressure oil according to the set pressure value, releases excess pressure, and prevents the system from over-pressure. Further, the low-pressure oil passes through the high-pressure filter 5.2, and the high-pressure filter 5.2 removes impurities in the low-pressure oil to ensure the cleanliness of the low-pressure oil. Further, the low-pressure oil opens or closes the hydraulic oil circuit through the high-pressure ball valve 9 to adjust the flow direction of the low-pressure oil.

[0056] The digital cylinder test bench provided in this embodiment provides a low-pressure oil to the digital cylinder under test by providing an oil replenishment unit when the chamber pressure of the digital cylinder under test is lower than a preset threshold value. On the first hand, it effectively prevents the phenomenon of cavitation and ensures the normal operation and stability of the digital cylinder under test. On the second hand, during the performance verification process, the oil replenishment unit can automatically replenish the low-pressure oil to the verification module when the chamber pressure of the digital cylinder under test is lower than a preset threshold value, thereby ensuring the smooth progress of the performance verification, reducing the situation of operation interruption, improving the test efficiency, and improving the test accuracy.

[0057] For details, please continue to refer to Figure 2The flow test unit includes a flow meter 3 and a return oil filter 8. The inlet end of the return oil filter 8 is connected to the outlet end of the flow meter 3, and the outlet end of the return oil filter 8 is connected to the oil tank. The return oil filter 8 is used to filter the oil measured by the flow meter 3 to ensure that the oil returned to the oil tank is clean and free of impurities. The flow meter 3 is used to monitor the flow data of the digital cylinder under test in real time during the loading process of the digital cylinder under test.

[0058] In specific implementation, the flow meter 3 is responsible for the flow of oil. These measurement data are crucial to verify the performance of the digital cylinder, such as calculating the internal leakage, evaluating the flow fluctuation, etc. The data provided by the flow meter 3 can be used to monitor and optimize the operation of the system, and can also be used as the basic data for performance testing. The return oil filter 8 can ensure that the oil flowing through the flow meter 3 after measurement remains clean, preventing impurities in the oil from damaging other components of the hydraulic system. The return oil filter 8 ensures the long-term reliability and stability of the system and avoids failures caused by oil contamination.

[0059] The digital cylinder test bench provided in this embodiment can effectively monitor and maintain the flow and cleanliness of the oil in the oil supply circuit and the oil return circuit by setting a flow meter and an oil return filter, thereby ensuring the normal operation of the digital cylinder test bench, extending the service life of the digital cylinder test bench, and improving the accuracy of performance verification.

[0060] Figure 3 This is a schematic diagram of the structure of the verification module shown in an exemplary embodiment of the present application. Figure 3 The verification module includes a direction switching circuit and a loading circuit. Among them, multiple oil pressure ports of the tested digital cylinder 15 are respectively connected to the first series connection point and the second series connection point of the direction switching circuit. Multiple oil pressure ports of the loading digital cylinder 17 are respectively connected to the first series connection point and the second series connection point of the loading circuit.

[0061] Furthermore, after receiving the high-pressure oil transmitted by the driving module, the direction switching circuit determines the flow direction of the high-pressure oil based on the performance to be verified of the digital cylinder 15 to be tested, applies a load to the digital cylinder 15 to be tested based on the flow direction of the high-pressure oil, and controls the loading of the digital cylinder 15 to be tested. The loading circuit controls the high-pressure oil flowing through the loading digital cylinder 17 to flow back to the oil tank and controls the low-pressure oil transmitted by the driving module to flow to the digital cylinder 15 to be tested through the loading digital cylinder 17.

[0062] Specifically, the direction switching circuit includes a plurality of two-way cartridge valves and electromagnetic reversing valves. Among them, 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 of the direction switching circuit. 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 of the direction switching circuit. The electromagnetic reversing valve is used to control the conduction of the corresponding two-way cartridge valve.

[0063] For details, please continue to refer to Figure 3 The plurality of two-way cartridge valves include two-way cartridge valve 10.1, two-way cartridge valve 10.2, two-way cartridge valve 10.3, and two-way cartridge valve 10.4. The two-way cartridge valve 10.1 and the two-way cartridge valve 10.3 are connected in series, and their series connection point is the first series connection point of the direction switching circuit. The two-way cartridge valve 10.2 and the two-way cartridge valve 10.4 are connected in series, and their series connection point is the second series connection point of the direction switching circuit.

[0064] Furthermore, the two-way cartridge valve 10.1 and the two-way cartridge valve 10.2 are connected in parallel to control the inlet and outlet of the high-pressure oil. The two-way cartridge valve 10.3 and the two-way cartridge valve 10.4 are connected in parallel to realize the bidirectional loading and unloading operation of the digital cylinder 15 to be tested, so as to change the flow path of the high-pressure oil, thereby changing the extension or contraction direction of the digital cylinder 15 to be tested. The electromagnetic reversing valve 12 is used to quickly change the flow direction of the high-pressure oil.

[0065] In specific implementation, the loading direction of the tested digital cylinder 15 is controlled by the joint work of the two-way cartridge valve 10.1, the two-way cartridge valve 10.2, the two-way cartridge valve 10.3, the two-way cartridge valve 10.4 and the electromagnetic reversing valve 12. By accurately adjusting the flow direction of the high-pressure oil, it is ensured that the tested digital cylinder 15 can accurately extend and contract during the test. This design not only improves the flexibility and response speed of the system, but also ensures the reliability and accuracy of the test process.

[0066] Specifically, when the digital cylinder 15 under test is controlled to be loaded in the forward direction, the electromagnetic reversing valve 12 is energized, the two-way cartridge valve 10.1 and the two-way cartridge valve 10.3 are opened, the two-way cartridge valve 10.2 and the two-way cartridge valve 10.4 are closed, and the high-pressure oil flows into the working chamber of the digital cylinder 15 under test through the two-way cartridge valve 10.1 and the first oil pressure port of the digital cylinder under test, and flows back to the oil tank through the second oil pressure port of the digital cylinder under test and the two-way cartridge valve 10.3.

[0067] When the digital cylinder 15 under test is controlled to reversely load, the electromagnetic reversing valve 12 loses power, the two-way cartridge valve 10.2 and the two-way cartridge valve 10.4 are opened, the two-way cartridge valve 10.1 and the two-way cartridge valve 10.3 are closed, and the high-pressure oil flows into the working chamber of the digital cylinder 15 under test through the two-way cartridge valve 10.2 and the second oil pressure port of the digital cylinder under test, and flows back to the oil tank through the first oil pressure port of the digital cylinder under test and the two-way cartridge valve 10.4.

[0068] The digital cylinder test bench provided in this embodiment, on the one hand, can realize the bidirectional flow of high-pressure oil by setting a direction switching 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 direction switching 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 verification module can support bidirectional loading and control, and realize the bidirectional loading of the digital cylinder 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 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 the direction switching circuit, various working conditions of the digital cylinder under test in actual applications can be simulated, and the performance of the digital cylinder 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 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.

[0069] Specifically, the loading circuit includes a hydraulic circuit and a proportional relief valve. The hydraulic circuit includes a plurality of two-way cartridge valves, the first two-way cartridge valve and the second two-way cartridge valve are connected in series, and their series connection point is the first series connection point of the loading circuit. The third 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 of the loading circuit; the first series connection point is connected to the first pressure oil port of the loading digital cylinder, and the second series connection point is connected to the second pressure oil port of the loading digital cylinder.

[0070] Furthermore, the hydraulic circuit is used to control the high-pressure oil flowing through the loading digital cylinder to flow to the proportional overflow valve; the hydraulic circuit is also used to control the low-pressure oil transmitted by the drive module to flow to the digital cylinder under test through the loading digital cylinder; the proportional overflow valve is used to receive the high-pressure oil delivered by the hydraulic circuit and overflow the oil exceeding the set pressure back to the oil tank.

[0071] For details, please continue to refer to Figure 3 The hydraulic circuit includes a two-way cartridge valve 10.5, a two-way cartridge valve 10.6, a two-way cartridge valve 10.7, and a two-way cartridge valve 10.8. Among them, the two-way cartridge valve 10.5 and the two-way cartridge valve 10.6 are connected in series, and their series connection point is the first series connection point of the loading circuit. The two-way cartridge valve 10.7 and the two-way cartridge valve 10.8 are connected in series, and their series connection point is the second series connection point of the loading circuit. For further information, please continue to refer to Figure 3 The verification module also includes a pressure plug-in 11, a pressure sensor 6.2, a pressure sensor 6.3, and a proportional relief valve 18. The pressure plug-in 11 is installed in the pipeline where the high-pressure oil flows, the pressure sensor 6.2 and the pressure sensor 6.3 are installed on the oil inlet side and the oil outlet side of the loading digital cylinder 17 respectively, and the proportional relief valve 18 is connected with the pressure sensor 6.2, the pressure sensor 6.3, and the loading digital cylinder 17.

[0072] Furthermore, two-way cartridge valve 10.5 and two-way cartridge valve 10.6 are connected in parallel to control the entry and discharge of high-pressure oil. Two-way cartridge valve 10.7 and two-way cartridge valve 10.8 are connected in parallel to realize bidirectional loading of the loading digital cylinder and change the loading mode or unloading state of the loading digital cylinder. Pressure plug-in 11 is used to set the loading pressure of the system to ensure that the system operates within the set pressure range. Pressure sensor 6.2 and pressure sensor 6.3 are used to monitor the pressure in the system and loading circuit in real time and provide feedback data to realize pressure closed-loop control. Loading digital cylinder 17 is used to receive high-pressure oil to realize loading or unloading operations and simulate actual working conditions. Proportional relief valve 18 is used to set and limit the maximum pressure of the system to prevent the system pressure from being too high.

[0073] It should be noted that the two-way cartridge valve 10.5, the two-way cartridge valve 10.6, the two-way cartridge valve 10.7 and the two-way cartridge valve 10.8 form a hydraulic bridge circuit to realize bidirectional loading of the loading digital cylinder. The pressure plug-in 11 and the proportional relief valve 18 form a loading relief valve for setting the loading pressure.

[0074] In specific implementation, when the digital cylinder 15 under test is controlled to load the load in the forward direction, the high-pressure oil flows back to the oil tank through the first oil pressure port of the digital cylinder 22, the first series connection point (two-way cartridge valve 10.5, two-way cartridge valve 10.6), and the proportional relief valve 18; when the digital cylinder 15 under test is controlled to load the load in the reverse direction, the high-pressure oil flows back to the oil tank through the second oil pressure port of the digital cylinder 22, the second series connection point (two-way cartridge valve 10.8, two-way cartridge valve 10.7), and the proportional relief valve 18.

[0075] In specific implementation, when the digital cylinder 15 under test is controlled to load the load in the forward direction, the low-pressure oil flows to the loading digital cylinder 22 through the second series connection point (two-way cartridge valve 10.7, two-way cartridge valve 10.8) and the second oil pressure port of the loading digital cylinder 22; when the digital cylinder 15 under test is controlled to load the load in the reverse direction, the low-pressure oil flows to the loading digital cylinder 22 through the first series connection point (two-way cartridge valve 10.6, two-way cartridge valve 10.5) and the first oil pressure port of the loading digital cylinder 22.

[0076] In specific implementation, through the combination of four two-way cartridge valves in the hydraulic bridge circuit, bidirectional loading of the loading digital cylinder 17 can be achieved, and then the load is applied to the digital cylinder 15 under test based on the loading digital cylinder 17, which can meet different test requirements. The loading relief valve composed of the pressure plug-in 11 and the proportional relief valve 18 ensures accurate control and protection of the system pressure. The overall design makes the pressure control and loading direction control during the test process accurate and reliable, which helps to comprehensively evaluate the performance of the digital cylinder under test.

[0077] The digital cylinder test bench provided in this embodiment, by setting a proportional relief valve in the loading circuit, firstly, the proportional relief valve can accurately adjust the pressure of the low-pressure oil flowing into the digital cylinder under test according to the set value, so as to achieve high-precision pressure control and ensure that the load pressure applied to the digital cylinder under test is accurate. Secondly, by flexibly adjusting the pressure, the working conditions of the digital cylinder under test under different pressure conditions, such as normal operation, pressure shock and system vibration, can be simulated. Thirdly, the proportional relief valve monitors the system pressure based on the set maximum pressure value. When the set value is exceeded, the proportional relief valve releases the excess oil into the return oil circuit or the oil tank to prevent the system from being damaged due to excessive pressure and ensure the safety of the test equipment and personnel. Fourthly, by setting a hydraulic circuit, the two-way flow of high-pressure oil can be achieved, that is, no matter from which direction the high-pressure oil enters the loading circuit, the corresponding two-way cartridge valve can achieve the expected flow path, so that the high-pressure oil overflows back to the oil tank.

[0078] Optional, please continue to refer to Figure 3 The digital cylinder 15 to be tested is equipped with sensors, which at least include a displacement sensor 13, a vibration sensor 14, and a force sensor 16. The displacement sensor 13 is connected to the digital cylinder 15 to be tested, the vibration sensor 14 is connected to the digital cylinder 15 to be tested, and the force sensor 16 is connected to the digital cylinder 15 to be tested.

[0079] Furthermore, the displacement sensor 13 is used to monitor the displacement data of the digital cylinder 15 under test during the loading process; the vibration sensor 14 is used to monitor the axial vibration data of the digital cylinder 15 under test during the loading process; the force sensor 16 is used to monitor the force data of the digital cylinder 15 under test during the loading process, and based on the relationship between the force data and the target force value, the flow rate of the high-pressure oil is adjusted to adjust the output force of the digital cylinder 15 under test.

[0080] Preferably, in a possible implementation, when the performance to be verified of the digital cylinder under test is pressure, the overflow valve 7.1 is controlled to adjust the pressure of the high-pressure oil, and the loading of the digital cylinder under test 15 is controlled under high-pressure oil of different pressures; the pressure sensor 6.1 monitors the pressure of the high-pressure oil in real time, and adjusts the pressure of the high-pressure oil based on the relationship between the pressure and the target pressure; the performance parameters of the digital cylinder under test 15 during the loading process driven by high-pressure oil of different pressures are collected based on the sensor, and the performance of the digital cylinder under test 15 is verified based on the performance parameters.

[0081] Preferably, in another possible implementation, when the performance to be verified of the digital cylinder under test is load, the flow direction of the high-pressure oil is changed based on the direction switching circuit, and the loading of the digital cylinder under test 15 is controlled under the high-pressure oil in different flow directions. The performance parameters of the digital cylinder under test 15 during the loading process driven by the high-pressure oil in different flow directions are collected based on the sensor, and the performance of the digital cylinder under test 15 is verified based on the performance parameters.

[0082] The digital cylinder 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 digital cylinder, and can test the optimal speed range of the tested digital cylinder, thereby improving the accuracy and reliability of the control performance verification of the tested digital cylinder. On the other hand, by setting the digital cylinder test bench as a drive module and a verification module, the drive module provides high-pressure oil to the verification module, and the verification module applies a load to the tested digital cylinder based on the performance to be verified of the tested digital cylinder to control the loading of the tested digital cylinder, the workload of the tested digital cylinder can be accurately adjusted, and then the output pressure and flow of the tested digital cylinder can be controlled, so as to avoid idling or overspeeding of the tested digital cylinder and improve stability. In addition, the performance parameters of the digital cylinder under test during the loading process are collected in real time based on the sensors installed on the digital cylinder under test. In the subsequent stage, the performance of the digital cylinder under test 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 digital cylinder, realizes the new functions of multi-source state detection and life prediction of the digital cylinder, and provides test conditions for the factory test and research and development of the new digital cylinder. Thirdly, the flow direction of the high-pressure oil is determined based on the performance to be verified of the digital cylinder under test, and then the loading of the digital cylinder under test is controlled based on the different flow directions of the high-pressure oil. It can simulate various working conditions of the digital cylinder in actual applications, comprehensively verify the performance of the digital cylinder 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, the flexible oil flow control design reduces the need for additional test equipment. A variety of performance verification functions can be realized by adjusting the valve and control system. This integrated design helps save resources and reduce testing costs. Fifthly, by setting up an oil replenishment unit, when the chamber pressure of the digital cylinder under test is lower than the preset threshold, low-pressure oil is provided to the digital cylinder under test, effectively preventing the phenomenon of cavitation, and ensuring the normal operation and stability of the digital cylinder under test. Moreover, during the performance verification process, the oil replenishment unit can automatically replenish low-pressure oil to the verification module when the chamber pressure of the digital cylinder under test is lower than the preset threshold, ensuring the smooth progress of the performance verification, reducing the interruption of operation, improving the test efficiency, and improving the test accuracy.

[0083] Corresponding to the aforementioned embodiment of a digital cylinder test bench, the present application also provides an embodiment of a digital cylinder performance verification method.

[0084] Figure 4 This is a flow chart of the first embodiment of the digital cylinder performance verification method provided by this application. Please refer to Figure 4The method provided in this embodiment is applied to the digital cylinder test bench described in any one of the present applications; the method includes:

[0085] S401. Determine the flow direction of the high-pressure oil based on the performance to be verified of the digital cylinder being tested, and control the high-pressure oil to flow toward the digital cylinder being tested.

[0086] Specifically, the flow direction of the high-pressure oil is related to the performance to be verified of the digital cylinder being tested. For example, in one embodiment, in a possible implementation, when the pressure resistance of the digital cylinder being tested needs to be verified, the digital cylinder being tested needs to be tested separately based on high-pressure oils with multiple flow directions.

[0087] S402: Apply a load to the digital cylinder under test based on the flow direction to control the loading of the digital cylinder under test.

[0088] Specifically, the direction of the load applied to the digital cylinder being tested is consistent with the flow direction of the high-pressure oil.

[0089] In this step, a load in the same direction as the flow direction of the high-pressure oil is applied to the digital cylinder under test, and the digital cylinder under test is loaded under the drive of the high-pressure oil.

[0090] S403: collecting performance parameters of the digital cylinder under test during the loading process based on sensors, and performing performance verification on the digital cylinder under test based on the performance parameters.

[0091] Specifically, the performance parameters collected by the sensor are related to the performance to be verified of the digital cylinder under test, that is, corresponding performance parameters are collected based on different types of sensors, wherein the types of sensors include at least vibration sensors, temperature sensors, pressure sensors, displacement sensors, and force sensors.

[0092] In specific implementation, based on the performance to be verified of the digital cylinder under test, the performance parameters and corresponding sensors to be collected are determined. The performance parameters of the digital cylinder under test during the loading process are collected in real time based on the multiple sensors installed on the digital cylinder under test, and the performance of the digital cylinder under test is verified based on the performance verification method corresponding to the performance to be verified and the collected performance parameters.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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 cylinder test bench, characterized in that: The digital cylinder test bench includes a driving module and a verification module; wherein the driving module includes a DC speed regulating motor, which is used to provide high-pressure oil to the verification module when the performance of the digital cylinder under test is verified; the digital cylinder under test is installed on the verification module, and the loading digital cylinder is installed on the verification module; the digital cylinder under test is provided with an oil pressure port, and the loading digital cylinder is provided with an oil pressure port, and a plurality of sensors are installed on the digital cylinder under test, and the type of the sensor is determined according to the type of the digital cylinder under test and the performance to be verified, and the sensor is used to collect the performance parameters of the digital cylinder under test during the loading process, wherein the performance parameters are used to perform performance verification on the digital cylinder under test; The verification module includes a direction switching circuit and a loading circuit. The digital oil cylinder under test is provided with an oil pressure port, and 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 switching circuit; the loading digital oil cylinder is provided with an oil pressure port, and a plurality of the oil pressure ports are respectively connected to a first series connection point and a second series connection point of the loading circuit; the verification module is used to determine the flow direction of the high-pressure oil based on the performance to be verified of the digital oil cylinder under test, and to apply a load to the loading digital oil cylinder based on the flow direction of the high-pressure oil, and the loading digital oil cylinder transmits the load to the digital oil cylinder under test to control the loading of the digital oil cylinder under test; The loading circuit includes a hydraulic bridge, a loading digital cylinder, a pressure sensor, and a pressure plug-in; wherein the hydraulic bridge is connected to the pressure plug-in and the loading digital cylinder, and the pressure plug-in is connected to the pressure sensor; The hydraulic bridge controls the high-pressure oil to enter different chambers of the loading digital cylinder, and the loading digital cylinder applies a load to the tested digital cylinder to achieve bidirectional loading of the tested digital cylinder; The pressure sensor monitors the pressure change in the loading digital cylinder in real time; the pressure plug-in adjusts the pressure based on the pressure change.

2. The digital cylinder test bench according to claim 1 is characterized in that: The driving module includes a power unit, an oil replenishment unit and a flow test unit; wherein, The power unit is used to provide high-pressure oil to the verification module when verifying the performance of the digital cylinder under test; The oil replenishing unit is used to provide low-pressure oil to the verification module when the chamber pressure of the tested digital cylinder is lower than a preset threshold; The flow rate testing unit is used to monitor the flow rate data of the digital cylinder under test in real time during the loading process of the digital cylinder under test.

3. The digital cylinder test bench according to claim 2 is characterized in that: The oil replenishment unit includes a DC speed regulating motor, a dosing pump, a high-pressure filter, a relief valve and a high-pressure ball valve; the DC speed regulating motor is connected to the dosing pump, the dosing pump is connected to the high-pressure filter, the high-pressure filter is connected to the high-pressure ball valve, and the high-pressure ball valve is connected to the relief valve; The DC speed regulating motor starts and drives the metering pump, and the metering pump draws low-pressure oil from the oil tank, and the low-pressure oil passes through the high-pressure filter to reach the high-pressure ball valve; When the chamber pressure of the digital oil cylinder under test is lower than a preset threshold, the high-pressure ball valve opens, and high-pressure oil enters the high-pressure ball valve; When the chamber pressure of the tested digital cylinder is higher than the preset pressure set by the relief valve, the remaining high-pressure oil in the tested digital cylinder flows back to the oil tank from the relief valve.

4. The digital cylinder test bench according to claim 1, characterized in that: The flow direction of the high-pressure oil is changed based on the direction switching circuit, and the loading of the digital cylinder under test is controlled under the high-pressure oil in different flow directions. The performance parameters of the digital cylinder under test during the loading process driven by the high-pressure oil in different flow directions are collected based on the sensor, and the performance of the digital cylinder under test is verified based on the performance parameters.

5. The digital cylinder test bench according to claim 4 is characterized in that: The direction switching circuit includes a plurality of two-way cartridge valves; wherein 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 tested digital oil cylinder is controlled to be loaded in the forward direction, the first two-way cartridge valve and the third two-way cartridge valve are opened, the second two-way cartridge valve and the fourth two-way cartridge valve are closed, and the high-pressure oil flows into the working chamber of the tested digital oil cylinder through the first two-way cartridge valve and the first oil pressure port of the tested digital oil cylinder, and flows back to the oil tank through the second oil pressure port of the tested digital oil cylinder and the third two-way cartridge valve; When the digital cylinder under test is controlled to be reverse loaded, the second two-way cartridge valve and the fourth two-way cartridge valve are opened, the first two-way cartridge valve and the third two-way cartridge valve are closed, and the high-pressure oil flows into the working chamber of the digital cylinder under test through the second two-way cartridge valve and the second oil pressure port of the digital cylinder under test, and flows back to the oil tank through the first oil pressure port of the digital cylinder under test and the fourth two-way cartridge valve.

6. The digital cylinder test bench according to claim 1, characterized in that: The loading circuit includes a hydraulic circuit and a proportional relief valve; wherein the hydraulic circuit includes a plurality of two-way cartridge valves, the first two-way cartridge valve and the second two-way cartridge valve are connected in parallel, and the third two-way cartridge valve and the fourth two-way cartridge valve are connected in parallel; the first series connection point is connected to the first oil pressure port of the loading digital cylinder, and the second series connection point is connected to the second oil pressure port of the loading digital cylinder; The hydraulic circuit is used to control the high-pressure oil flowing through the loading digital cylinder to flow to the proportional relief valve; The hydraulic circuit is also used to control the low-pressure oil transmitted by the driving module to flow to the tested digital cylinder through the loading digital cylinder; The proportional relief valve is used to receive high-pressure oil delivered by the hydraulic circuit and overflow the oil exceeding the set pressure back to the oil tank.

7. The digital cylinder test bench according to claim 6, characterized in that: When the tested digital cylinder is controlled to load forward, the low-pressure oil flows to the loading digital cylinder through the second series connection point and the second oil pressure port of the loading digital cylinder; When the tested digital cylinder is controlled to be reversely loaded, the low-pressure oil flows to the loading digital cylinder through the first series connection point and the first oil pressure port of the loading digital cylinder.

8. The digital cylinder test bench according to any one of claims 1 to 7, characterized in that: The performing performance verification on the tested digital cylinder based on the performance parameters includes: Based on the performance to be verified of the digital cylinder being tested, target performance parameters and a performance verification method are determined; the target performance parameters include at least flow data, displacement data, and axial vibration data, and the performance verification method is used to calculate a performance score of the performance to be verified; Based on the performance verification method and the target performance parameter, calculating the performance score of the performance to be verified; When the performance score is greater than a preset score, it is determined that the performance to be verified of the tested digital cylinder is good.

9. A digital cylinder performance verification method, characterized in that: The digital cylinder performance verification method is applied to the digital cylinder test bench according to any one of claims 1 to 8; the method comprises: Determining the flow direction of the high-pressure oil based on the performance to be verified of the digital cylinder being tested, and controlling the high-pressure oil to flow toward the digital cylinder being tested; Applying a load to the digital cylinder under test based on the flow direction, and controlling the loading of the digital cylinder under test; The performance parameters of the digital cylinder under test during the loading process are collected based on sensors, and the performance of the digital cylinder under test is verified based on the performance parameters.

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