A testing method and device for proportional pressure reducing valve

Abstract

The present invention discloses a testing method and device for a proportional pressure reducing valve, the method comprising: obtaining a preset test opening and a pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve is a curve that the output pressure follows when the control signal of the proportional pressure reducing valve changes incrementally and incrementally; adjusting the proportional pressure reducing valve to a preset test opening for a loading test to obtain a loading pressure interval; and determining the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval. By determining the normal range of pressure fluctuation of the proportional pressure reducing valve with the pressure signal curve, the loading pressure interval can characterize the change of pressure of the proportional pressure reducing valve during the pressure reduction process when there is flow at the preset test opening. The stability of the three-way proportional pressure reducing valve under the corresponding test conditions can be accurately known through the pressure signal curve and the loading pressure interval, thereby improving the accuracy of the performance test results of the three-way proportional pressure reducing valve.

Description

Technical Field

[0001] The present application relates to the technical field of proportional pressure reducing valve performance testing, and in particular to a proportional pressure reducing valve testing method and device. Background Art

[0002] Proportional pressure reducing valves are widely used in important hydraulic control systems in the metallurgical industry, such as the hydraulic control of the edge shearing of medium and thick plates, the hydraulic control of the AGC (Automatic Gauge Control) of hot rolling mills, and the hydraulic control of the back pressure of the roll changing device of medium and thick plate mills. The performance of the proportional pressure reducing valve directly determines the stability of the entire control system and the product quality. The current national standard test method cannot be applied to the test of proportional pressure reducing valves. For example, the pressure control valve test method in Part 3 of GB / T 15623.3-2012, China Electric Modulation Hydraulic Control Valve, provides the pressure reducing valve test circuit and the reverse overflow pressure reducing valve test circuit. However, since the main valve body of the three-way proportional pressure reducing valve is applied with the directional valve body, some channels are idle, and there is internal leakage in the sliding valve structure. Through the national standard test method, it is analyzed that the test process does not take the above factors into account. Therefore, the pressure control valve test method in Part 3 of GB / T15623.3-2012, China Electric Modulation Hydraulic Control Valve, cannot be applied to all equipment conditions where the proportional pressure reducing valve is used, resulting in deviations in the test results of the proportional pressure reducing valve.

[0003] Therefore, how to improve the accuracy of proportional pressure reducing valve performance test results is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The invention provides a testing method and device for a proportional pressure reducing valve, which improves the accuracy of the test results of the performance of the proportional pressure reducing valve.

[0005] The embodiment of the present invention provides the following solution:

[0006] In a first aspect, an embodiment of the present invention provides a method for testing a proportional pressure reducing valve, comprising:

[0007] Obtaining a preset test opening and pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve is a curve that the output pressure changes with increasing and decreasing changes in the control signal of the proportional pressure reducing valve;

[0008] The proportional pressure reducing valve is adjusted to the preset test opening to perform a loading test to obtain a loading pressure range;

[0009] A pressure reduction test result of the proportional pressure reducing valve is determined according to the pressure signal curve and the loading pressure interval.

[0010] In an optional embodiment, obtaining a pressure signal curve of the proportional pressure reducing valve includes:

[0011] Obtaining the rated pressure of the proportional pressure reducing valve and the adjustment range of the control signal;

[0012] Loading the rated pressure to the proportional pressure reducing valve, and controlling the control signal to change between the two end values ​​of the adjustment interval to increase and decrease, and obtaining the pressure change data of the hydraulic pressure output by the proportional pressure reducing valve;

[0013] The pressure signal curve is obtained according to the change value of the control signal and the corresponding pressure change data.

[0014] In an optional embodiment, the adjusting the proportional pressure reducing valve to the preset test opening to perform a loading test to obtain a loading pressure range includes:

[0015] Obtaining a flow limit value of the loading test, wherein the flow limit value is a flow value corresponding to the pressure of the preset test opening;

[0016] Outputting the hydraulic load to the proportional pressure reducing valve of the preset test opening until the flow of the hydraulic load reaches the flow limit value, and obtaining the loading pressure corresponding to the change in the flow of the hydraulic load;

[0017] The loading pressure interval is obtained according to the maximum value and the minimum value of all the loading pressures.

[0018] In an optional embodiment, determining the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval includes:

[0019] Determining a safe pressure region of the preset test opening according to a control signal corresponding to the preset test opening in the pressure signal curve;

[0020] If the loading pressure interval is within the safety pressure region, the decompression test result is determined to be qualified.

[0021] In an optional embodiment, after determining the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval, the method further includes:

[0022] Obtaining control parameters of the proportional pressure reducing valve when it reaches the predicted pressure relief pressure;

[0023] The proportional pressure reducing valve is adjusted to a valve opening corresponding to the control parameter, and the predicted pressure relief pressure is loaded for testing until a preset pressure relief pressure limit is reached, and a pressure relief test curve of pressure change with flow rate during loading is obtained;

[0024] The safe pressure relief result of the proportional pressure reducing valve is determined according to the pressure relief test curve and the rated pressure relief curve of the proportional pressure reducing valve.

[0025] In an optional embodiment, the obtaining of the control parameter of the proportional pressure reducing valve when the proportional pressure reducing valve reaches the predicted pressure relief pressure includes:

[0026] The proportional pressure reducing valve is tested by loading rated pressure at different openings to obtain the opening pressures and parameter control values ​​corresponding to the different openings;

[0027] If the opening pressure is the same as the predicted pressure relief pressure, the parameter control value is determined to be the control parameter.

[0028] In an optional embodiment, determining the safety pressure relief result of the proportional pressure reducing valve according to the pressure relief test curve and the rated pressure relief curve of the proportional pressure reducing valve includes:

[0029] Determining whether a flow deviation between the pressure relief test curve and the rated pressure relief curve at the same pressure is less than a flow threshold;

[0030] If so, it is determined that the safety pressure relief result is qualified.

[0031] In a second aspect, an embodiment of the present invention further provides a testing device for a proportional pressure reducing valve, comprising:

[0032] A first acquisition module is used to acquire a preset test opening and a pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve is a curve that the output pressure changes with increasing and decreasing changes in the control signal of the proportional pressure reducing valve;

[0033] A first obtaining module is used to adjust the proportional pressure reducing valve to the preset test opening to perform a loading test and obtain a loading pressure range;

[0034] The first determination module is used to determine the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval.

[0035] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a processor and a memory, wherein the memory is coupled to the processor, and the memory stores instructions, which, when executed by the processor, enable the electronic device to perform the steps of any one of the methods described in the first aspect.

[0036] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0037] Compared with the prior art, the testing method and device of a proportional pressure reducing valve provided by the present invention have the following advantages:

[0038] The present invention obtains a preset test opening and a pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve can characterize the follow-up change of the output pressure of the proportional pressure reducing valve when the control signal of the proportional pressure reducing valve continuously increases and decreases, so as to determine the normal range of the pressure fluctuation of the proportional pressure reducing valve; the proportional pressure reducing valve is adjusted to a preset test opening for a loading test to obtain a loading pressure interval, wherein the loading pressure interval can characterize the change of the pressure of the proportional pressure reducing valve during the pressure reduction process when there is a flow at the preset test opening, and the stability of the three-way proportional pressure reducing valve under the corresponding test conditions can be accurately known through the pressure signal curve and the loading pressure interval, thereby improving the accuracy of the performance test results of the three-way proportional pressure reducing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the structure of a proportional pressure reducing valve provided in an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the principle structure of a proportional pressure reducing valve loading test provided by an embodiment of the present invention;

[0042] Figure 3 A flow chart of a method for testing a proportional pressure reducing valve provided by an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of a pressure signal curve provided by an embodiment of the present invention;

[0044] Figure 5 The pressure and flow curve obtained by the loading test provided by the embodiment of the present invention

[0045] Figure 6 A schematic diagram of a rated pressure relief curve provided by an embodiment of the present invention;

[0046] Figure 7 A schematic structural diagram of a testing device for a proportional pressure reducing valve provided in an embodiment of the present invention.

[0047] Description of reference numerals: 1-pilot valve, 2-proportional coil, 3-main valve, 4-main valve core, 5-first spring, 6-second spring, 7-oil hole, 8-flow controller, 9-throttle port, 10-pipeline, 11-control chamber, 12-throttle port, 13-first spring chamber, 14-second spring chamber;

[0048] 21-first servo ball valve, 22-flow meter, 23-servo proportional loading valve, 24-second servo ball valve, 25-pressure sensor, 26-pressure gauge, 27-servo BT ball valve, 28-servo T ball valve, 29-proportional pressure reducing valve, 30-servo A loading ball valve, 31-servo AT ball valve, 32-servo PA ball valve. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.

[0050] The proportional pressure reducing valve controls the flow rate through the pilot valve. For its structure and working principle, please refer to Figure 1 The proportional pressure reducing valve comprises a pilot valve 1 and a main valve 3, and a main valve core 4 on the main valve 3 is controlled by a proportional coil 2 on the pilot valve 1 to perform coordinated actions.

[0051] In the non-working state, the proportional coil 2 does not give a control signal. The main valve core 4 is kept in the middle position by the first spring 5 and the second spring 6. The oil inlet P is not connected to the oil outlet A, and the oil outlet A is not connected to the oil drain port T. The pilot control oil port X flows to the oil port Y through the oil hole 7, the flow controller 8, the throttle port 9, and the pipeline 10, and returns to the oil tank.

[0052] In the working state, the proportional coil 2 has a control signal, a pilot pressure is established in the control chamber 11, the throttle hole 12 establishes pressure in the first spring chamber 13, the main valve core 4 is pushed to the right, and the hydraulic oil flows from the oil inlet P to the oil outlet A. At the same time, the pressure of the oil outlet A appears in the second spring chamber 14, and the pressure of the oil outlet A is the same as the set pressure of the pilot valve 1.

[0053] In the pressure safety state (i.e., pressure relief state), the pressure at the oil outlet A increases and appears in the spring chamber 14, pushing the main valve core 4 to move left, the oil outlet A is connected to the oil drain port T, and the pressure of the oil circuit is reduced.

[0054] The test method of the present invention takes a Rexroth 3DREM 16P-60 / 200YG24K31V three-way proportional pressure reducing valve as an example, and the relevant parameters of the valve are shown in Table 1.

[0055] Table 1:

[0056]

[0057] The test is completed by the test bench, which can automatically collect pressure signals and control signals and draw pressure signal curves. The tester can manually input a test signal of any value within the control signal range of the proportional pressure reducing valve, and change the flow through the proportional pressure reducing valve 29 through the servo proportional loading valve 23, and draw a pressure flow curve. For the connection structure between the loading test bench and the proportional pressure reducing valve 29, please refer to Figure 2 The oil inlet P of the loading test bench is connected to the hydraulic power source, and the main valve core of the proportional pressure reducing valve is controlled to operate through the oil inlet X and the oil drain port Y. For example, when the proportional pressure reducing valve is powered and the oil inlet P is connected to the oil outlet A, the hydraulic oil flows through the first servo ball valve 21, the flow meter 22, the servo proportional loading valve 23, the servo BT ball valve 27 and the servo T ball valve 28 in sequence and flows back to the oil tank; the internal leakage hydraulic oil of the proportional pressure reducing valve from the P port to the B port flows back to the oil tank through the second servo ball valve 24, the servo BT ball valve 27 and the servo T ball valve 28. Among them, the flow in the oil circuit is collected and read by the flow meter 22, and the pressure in the oil circuit is collected and read by three pressure sensors 25 or pressure gauges 26. The following embodiment of the present invention will specifically explain how to implement the test method of the three-way proportional pressure reducing valve.

[0058] See also Figure 3 , Figure 3 A flow chart of a method for testing a proportional pressure reducing valve provided by an embodiment of the present invention includes:

[0059] S11. Obtaining a preset test opening and a pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve is a curve that the output pressure changes with when the control signal of the proportional pressure reducing valve increases or decreases.

[0060] Specifically, the preset test opening is any opening of the proportional pressure reducing valve, which can be 10%, 20%, 30%, 40%... of the maximum opening, up to 100% (i.e. the maximum opening), or it can be determined according to the actual opening range to test the performance of the proportional pressure reducing valve in the opening range. The pressure signal curve represents the corresponding relationship between the output pressure of the proportional pressure reducing valve and the change of the control signal when a certain pressure is loaded. Please refer to Figure 4 When the control signal gradually increases from 0 to 10V, the output pressure gradually increases due to the gradual increase in the unidirectional opening of the proportional pressure reducing valve. The output pressure is collected and fitted with the control signal to obtain an increasing curve. Conversely, when the control signal gradually decreases from 10V to 0, the output pressure also gradually decreases to obtain a decreasing curve.

[0061] It should be noted that the control signal can be a voltage value or a current value. When the control signal is a current value, under the rated pressure, the flow of the load is zero, and the input current is a complete cycle of continuous change between the positive and negative rated currents. The relationship curve between the load pressure and the input current is called the pressure signal curve. Check whether the pressure of the three-way proportional pressure reducing valve changes smoothly with the signal. The test method records the control signal range of one cycle on the X-axis and the output pressure change range on the Y-axis. The computer automatically collects the signal and pressure data and draws them into a pressure signal curve. Please continue to read Figure 2 , when the pressure signal curve is generated by the test bench test, the servo T ball valve is opened 28, the second servo ball valve 24 and the servo BT ball valve 27 are opened or not according to the hydraulic circuit of the equipment where the proportional pressure reducing valve 29 is installed, and the remaining ball valves are closed in order to flow the leaked oil back to the tank.

[0062] In a specific implementation, obtaining a pressure signal curve of a proportional pressure reducing valve includes:

[0063] The rated pressure of the proportional pressure reducing valve and the adjustment range of the control signal are obtained; the rated pressure is loaded to the proportional pressure reducing valve, and the control signal is controlled to increase and decrease between the two end values ​​of the adjustment range to obtain the pressure change data of the hydraulic pressure output by the proportional pressure reducing valve; the pressure signal curve is obtained according to the change value of the control signal and the corresponding pressure change data.

[0064] Specifically, the rated pressure represents the maximum pressure that the proportional pressure reducing valve can withstand during use. The adjustment range of the control signal can be determined by the specifications of the proportional coil of the pilot valve on the proportional pressure reducing valve. After the control signal is adjusted and changed within the adjustment range, the opening will change accordingly, and the flow rate and output pressure out of the oil outlet A will also change accordingly. After the pressure change data is collected, the pressure signal curve can be generated, wherein the collection period of the pressure change data can be freely set or used according to the inherent collection period of the test bench. After obtaining the preset test opening and pressure signal curve, enter step S12.

[0065] S12, adjusting the proportional pressure reducing valve to the preset test opening to perform a loading test to obtain a loading pressure range.

[0066] Specifically, there is a corresponding relationship between the opening of the proportional pressure reducing valve and the control signal. The larger the opening, the larger the corresponding control signal; conversely, the smaller the control signal. Therefore, when adjusting the proportional pressure reducing valve to the preset test opening, the opening signal value can be determined based on the corresponding relationship, and then the opening signal value is input into the proportional coil through the test bench to control the proportional pressure reducing valve to adjust to the preset test opening. The test pressure of the loading test can be determined by the test bench, for example, 7MPa. During the loading test, the output pressure of the oil outlet A is collected to obtain the loading pressure range. Please continue to refer to Figure 2When the loading pressure interval is obtained through the test bench test, the first servo ball valve 21, servo A loading ball valve 30, servo BT ball valve 27, and servo T ball valve 28 are opened, and the second servo ball valve 24 is opened or not according to the hydraulic circuit of the proportional pressure reducing valve installation equipment, and the other ball valves are closed. The oil enters from the oil inlet P and exits from the oil outlet A. The oil flows to the first servo ball valve 21, servo A loading ball valve 30, flow meter 22, servo proportional loading valve 23, servo BT ball valve 31 and oil tank in sequence.

[0067] During actual testing, there may be leakage in the gap between the main valve core and the main valve of the proportional pressure reducing valve. If the test pressure is directly used as an indicator for loading, deviations may occur in the obtained loading pressure range.

[0068] In a specific implementation, the proportional pressure reducing valve is adjusted to a preset test opening to perform a loading test to obtain a loading pressure range, including:

[0069] Obtain the flow limit of the loading test, wherein the flow limit is the flow value corresponding to the pressure of a preset test opening; output the hydraulic load to the proportional pressure reducing valve of the preset test opening until the flow of the hydraulic load reaches the flow limit, and obtain the loading pressure corresponding to the change in the flow of the hydraulic load; obtain the loading pressure range based on the maximum and minimum values ​​of all loading pressures.

[0070] Specifically, the flow limit represents the flow value corresponding to the pressure of the preset test opening. Using the flow value as the control parameter for loading, the loading pressure range obtained is more accurate. The test bench controls the loading flow of the proportional pressure reducing valve through the servo proportional loading valve. During the loading test, the flow value and pressure value are collected in real time, and the pressure and flow curve is generated after fitting calculation. Please refer to Figure 5 During the loading process, as the output flow rate changes, the loading pressure changes in the range of 8.8-10 MPa, thereby determining the loading pressure interval. After obtaining the loading pressure interval, enter step S13.

[0071] S13. Determine a pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval.

[0072] Specifically, the pressure signal curve represents the corresponding relationship between the proportional pressure reducing valve and the output pressure when the control signal changes continuously and regularly during the loading process; the loading pressure interval represents the change in the output pressure of the proportional pressure reducing valve when the loading test is performed at the preset test opening. If the loading pressure interval is within the safe range represented by the pressure signal curve, it means that the pressure reduction test result is qualified; otherwise, it means that the pressure reduction test result is unqualified and the proportional pressure reducing valve may have internal leakage.

[0073] In a specific implementation, determining a pressure reduction test result of a proportional pressure reducing valve according to a pressure signal curve and a loading pressure interval includes:

[0074] According to the control signal corresponding to the preset test opening in the pressure signal curve, the safe pressure area of ​​the preset test opening is determined; if the loading pressure interval is within the safe pressure area, the decompression test result is determined to be qualified.

[0075] For details, please continue to refer to Figure 4-5 , Figure 4 The increasing curve and the decreasing curve enclose an area, which represents the normal output pressure range of the proportional pressure reducing valve. Taking the preset test opening as 50% of the total opening as an example, the control signal corresponds to 5V, and the safety pressure area is 8-10MPa; Figure 5 It can be seen that the loading pressure interval is 8.8-10MPa, and the loading pressure interval is within the safe pressure area. It is determined that the decompression test result is qualified under the preset test opening.

[0076] In a specific implementation, after determining the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval, the method further includes:

[0077] Obtain the control parameters of the proportional pressure reducing valve when it reaches the predicted pressure relief pressure; adjust the proportional pressure reducing valve to the valve opening corresponding to the control parameters, load the predicted pressure relief pressure for testing until the preset pressure relief pressure limit is reached, and obtain the pressure relief test curve of the pressure change with flow during the loading process; determine the safe pressure relief result of the proportional pressure reducing valve based on the pressure relief test curve and the rated pressure relief curve of the proportional pressure reducing valve.

[0078] Specifically, the safety pressure relief result represents the test result of the safety performance of the proportional pressure reducing valve. The purpose of the test is to see whether the oil outlet A and the oil drain port T can be connected when the pressure of the proportional pressure reducing valve exceeds the set pressure, so as to achieve the purpose of safe pressure relief. The test process is still completed on the test bench. The control parameter can be voltage or current. The proportional pressure reducing valve is adjusted to the valve opening through the control parameter, and the predicted pressure relief pressure is loaded for testing until the preset pressure relief pressure limit is reached. The pressure relief test curve of the pressure change with flow during the loading process is obtained. If the deviation between the pressure relief test curve and the rated pressure relief curve is small, it means that the proportional pressure reducing valve can safely relieve pressure and the safety pressure relief result is qualified; otherwise, the safety pressure relief result is unqualified. Please continue to refer to Figure 2When the pressure relief curve is obtained through the test bench test, the servo PA ball valve 32, the first servo ball valve 21, the servo BT ball valve 27 and the servo AT ball valve 31 are opened, the second servo ball valve 24 is opened or not according to the hydraulic circuit of the proportional pressure reducing valve installation equipment, and the other ball valves are closed. The oil enters from the oil outlet A and exits from the oil drain port T. The oil inlet flows to the servo PA ball valve 32 and the first servo ball valve 21 to the proportional pressure reducing valve 29, and the oil outlet flows to the servo BT ball valve 27, the servo proportional loading valve 23, the flow meter 22, the servo AT ball valve 31 and the oil tank.

[0079] The specific test steps include:

[0080] 1. Set the loading pressure of the test bench to the rated pressure according to the pressure signal curve. When the output pressure of the oil outlet A is 50 bar, record the control signal value at this time and unload the system pressure.

[0081] 2. Switch to the safety performance test hydraulic circuit, manually input the control signal value recorded in the previous step (i.e. the control signal corresponding to the output pressure of port A of 50 bar), gradually increase the loading pressure, and when the loading pressure increases to 50 bar, record the loading pressure and flow at this time; slowly increase the loading pressure, and record the loading pressure and flow when the flow changes; record multiple times in sequence until the maximum flow of the test bench is reached. Draw the points recorded multiple times into a pressure relief test curve and compare it with the rated pressure relief curve.

[0082] See also Figure 6 The rated pressure relief curve can be obtained through the instruction manual of the proportional pressure reducing valve. In the embodiment of the present invention, 50 bar, 100 bar, 150 bar and 200 bar are selected for test and comparison to obtain a more comprehensive safety pressure relief result.

[0083] In a specific implementation, obtaining the control parameters of the proportional pressure reducing valve when the proportional pressure reducing valve reaches the predicted pressure relief pressure includes:

[0084] The proportional pressure reducing valve is tested by loading the rated pressure at different openings to obtain the opening pressure and parameter control value corresponding to the different openings; if the opening pressure is the same as the predicted pressure relief pressure, the parameter control value is determined as the control parameter.

[0085] Specifically, different openings can be determined based on the experience of testers, or by calibrating the proportional pressure reducing valve. When the opening pressure is the same as the predicted pressure relief pressure, it means that the valve opening achieved under the parameter control value is relatively accurate, and the parameter control value is determined to be the control parameter.

[0086] In a specific implementation, determining the safety pressure relief result of the proportional pressure reducing valve according to the pressure relief test curve and the rated pressure relief curve of the proportional pressure reducing valve includes:

[0087] Determine whether the flow deviation of the pressure relief test curve and the rated pressure relief curve at the same pressure is less than the flow threshold; if so, determine that the safety pressure relief result is qualified.

[0088] Specifically, the flow threshold can be set to 5% of the flow value in the rated pressure relief curve. Of course, the flow threshold can also be set according to actual conditions. If the flow deviation under the same pressure is not less than the flow threshold, it means that safe pressure relief can be carried out, and the safe pressure relief result is determined to be qualified; otherwise, it is unqualified.

[0089] Based on the same inventive concept as the testing method, the embodiment of the present invention also provides a testing device for a proportional pressure reducing valve, see Figure 7 ,include:

[0090] The first acquisition module 701 is used to acquire a preset test opening and a pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve is a curve that the output pressure changes with increasing and decreasing changes in the control signal of the proportional pressure reducing valve;

[0091] The first obtaining module 702 is used to adjust the proportional pressure reducing valve to the preset test opening to perform a loading test and obtain a loading pressure range;

[0092] The first determination module 703 is used to determine the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval.

[0093] It can be understood that the test device and the test method provided in the embodiment of the present invention are in a one-to-one correspondence, and other modules included in the test device are not described in detail here.

[0094] Based on the same inventive concept as the testing method, an embodiment of the present invention also provides an electronic device, including a processor and a memory, wherein the memory is coupled to the processor, and the memory stores instructions, which, when executed by the processor, enable the electronic device to perform the steps of any one of the methods described in the testing method.

[0095] Based on the same inventive concept as the testing method, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of any one of the methods described in the testing method are implemented.

[0096] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0097] By obtaining the preset test opening and pressure signal curve of the proportional pressure reducing valve, the pressure signal curve can characterize the follow-up change of the output pressure of the proportional pressure reducing valve when the control signal increases and decreases continuously, so as to determine the normal range of pressure fluctuation of the proportional pressure reducing valve; the proportional pressure reducing valve is adjusted to the preset test opening for loading test to obtain the loading pressure interval, which can characterize the change of pressure of the proportional pressure reducing valve during the pressure reduction process when there is flow at the preset test opening. The stability of the three-way proportional pressure reducing valve under the corresponding test conditions can be accurately known through the pressure signal curve and the loading pressure interval, thereby improving the accuracy of the performance test results of the three-way proportional pressure reducing valve.

[0098] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0099] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (modules, systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0100] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0101] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0102] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0103] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for testing a proportional pressure reducing valve, characterized in that: include: Obtaining a preset test opening and pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve is a curve that the output pressure changes with increasing and decreasing changes in the control signal of the proportional pressure reducing valve; The proportional pressure reducing valve is adjusted to the preset test opening to perform a loading test to obtain a loading pressure range; Determining a pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval; The step of obtaining a pressure signal curve of the proportional pressure reducing valve comprises: Obtaining the rated pressure of the proportional pressure reducing valve and the adjustment range of the control signal; Loading the rated pressure to the proportional pressure reducing valve, and controlling the control signal to change between the two end values ​​of the adjustment interval to increase and decrease, and obtaining the pressure change data of the hydraulic pressure output by the proportional pressure reducing valve; Obtaining the pressure signal curve according to the change value of the control signal and the corresponding pressure change data; The step of adjusting the proportional pressure reducing valve to the preset test opening to perform a loading test and obtain a loading pressure range includes: Obtaining a flow limit value of the loading test, wherein the flow limit value is a flow value corresponding to the pressure of the preset test opening; Outputting the hydraulic load to the proportional pressure reducing valve of the preset test opening until the flow of the hydraulic load reaches the flow limit value, and obtaining the loading pressure corresponding to the change in the flow of the hydraulic load; Obtaining the loading pressure interval according to the maximum value and the minimum value of all the loading pressures; Determining the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval includes: Determining a safe pressure region of the preset test opening according to a control signal corresponding to the preset test opening in the pressure signal curve; If the loading pressure interval is within the safety pressure region, the decompression test result is determined to be qualified.

2. The method for testing a proportional pressure reducing valve according to claim 1, characterized in that: After determining the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval, the method further includes: Obtaining control parameters of the proportional pressure reducing valve when it reaches the predicted pressure relief pressure; The proportional pressure reducing valve is adjusted to a valve opening corresponding to the control parameter, and the predicted pressure relief pressure is loaded for testing until a preset pressure relief pressure limit is reached, and a pressure relief test curve of pressure change with flow rate during loading is obtained; The safe pressure relief result of the proportional pressure reducing valve is determined according to the pressure relief test curve and the rated pressure relief curve of the proportional pressure reducing valve.

3. The testing method of the proportional pressure reducing valve according to claim 2, characterized in that: The obtaining of the control parameters of the proportional pressure reducing valve when the proportional pressure reducing valve reaches the predicted pressure relief pressure includes: The proportional pressure reducing valve is tested by loading rated pressure at different openings to obtain the opening pressures and parameter control values ​​corresponding to the different openings; If the opening pressure is the same as the predicted pressure relief pressure, the parameter control value is determined to be the control parameter.

4. The method for testing a proportional pressure reducing valve according to claim 2, characterized in that: Determining the safe pressure relief result of the proportional pressure reducing valve according to the pressure relief test curve and the rated pressure relief curve of the proportional pressure reducing valve includes: Determining whether a flow deviation between the pressure relief test curve and the rated pressure relief curve at the same pressure is less than a flow threshold; If so, it is determined that the safety pressure relief result is qualified.

5. A testing device for a proportional pressure reducing valve, the testing device being used to implement the steps of the method according to any one of claims 1 to 4, characterized in that: include: A first acquisition module is used to acquire a preset test opening and a pressure signal curve of the proportional pressure reducing valve, wherein the pressure signal curve is a curve that the output pressure changes with increasing and decreasing changes in the control signal of the proportional pressure reducing valve; A first obtaining module is used to adjust the proportional pressure reducing valve to the preset test opening to perform a loading test and obtain a loading pressure range; The first determination module is used to determine the pressure reduction test result of the proportional pressure reducing valve according to the pressure signal curve and the loading pressure interval.

6. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory is coupled to the processor and stores instructions, and when the instructions are executed by the processor, the electronic device executes the steps of the method according to any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 4 are implemented.

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