A hydraulic system for reliability testing of a proportional flow valve and its testing method

Abstract

The present invention provides a hydraulic system and test method for proportional flow valve reliability testing, relating to the technical field of hydraulic systems. The system comprises a pump station system, a multi-way composite oil source control valve group, two multi-way parallel detection systems, a digital hydraulic accumulator system, a leakage detection system, a multi-way state control valve group, a static test assembly, and a dynamic test assembly. Four valves under test are disposed between the multi-way composite oil source control valve group and the multi-way state control valve group. Ports P of the four valves under test are respectively connected to the oil outlet of the multi-way composite oil source control valve group and the digital hydraulic accumulator system. Ports A and B are respectively connected to the oil inlet of the multi-way state control valve group. Ports T of the valves under test in pairs are respectively connected to the two multi-way parallel detection systems. Ports Y are all connected to the leakage detection system. A pressure reducing valve is connected between port X and the oil outlet of the multi-way composite oil source control valve group. The present invention can simultaneously perform static and dynamic characteristic tests on the four valves under test, thereby improving testing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a hydraulic system for reliability testing of a proportional flow valve and a testing method thereof. Background Art

[0002] The proportional flow valve is an important component in the hydraulic system that controls the accuracy and speed of the actuators. The reliability of its operation is one of the important indicators for evaluating the performance of the proportional flow valve. The hydraulic industry test standards specify the design requirements for the circuit of a single proportional flow valve test system. The proportional flow valve test can be divided into static characteristic test and dynamic characteristic test to demonstrate the characteristic level of the proportional flow valve. This single test method cannot meet the working condition requirements for continuous simulation of the reliability of the proportional flow valve, and the number of test samples per unit time is limited. When multiple proportional flow valve components are tested simultaneously, multiple test systems are required, which easily leads to waste of resources. Therefore, it is necessary to establish a hydraulic system and test method for proportional flow valve reliability to meet the test requirements of multiple sample quantities and avoid waste of test system resources. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydraulic system and a test method for reliability testing of proportional flow valves, which can simultaneously perform static characteristic testing, dynamic characteristic testing and reliability testing on four proportional flow valves, significantly improving the switching control of the hydraulic system during different characteristic testing, realizing the test of simulated working conditions, and increasing the number of test samples, greatly reducing the test switching time, improving test efficiency, and avoiding waste of resources.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A hydraulic system for reliability testing of a proportional flow valve includes a pump station system, a multi-way composite oil source control valve group, two sets of multi-way parallel detection systems, a digital hydraulic energy storage system, a leakage detection system, a multi-way state control valve group, a static test component, and a dynamic test component. Four valves to be tested are provided between the multi-way composite oil source control valve group and the multi-way state control valve group.

[0006] The pump station system includes an oil tank and four parallel plunger pumps with different flow ranges, the oil inlets of the four plunger pumps are respectively connected to the oil tank, the oil outlets are respectively connected to an oil inlet check valve, and an unloading valve is connected between the oil outlet of each oil inlet check valve and the oil tank;

[0007] The multiplexed oil source control valve group is provided with four oil inlets DA, DB, DC, and DD, and four oil outlets DE, DF, DG, and DH that are connected to the oil inlets in a one-to-one correspondence. The four oil inlets DA, DB, DC, and DD are connected to the oil outlets of the four oil inlet check valves in a one-to-one correspondence, and the four oil outlets DE, DF, DG, and DH are connected to corresponding oil outlet pressure sensors. DA and DE, DB and DF, DC and DG, DD and DH, DA and DB, DB and DE, DB and DC, DC and DF, DC and DD, and DD and DG are connected via oil source electromagnetic ball valves. The ten oil source electromagnetic ball valves form multiple oil paths between the eight oil ports on the multiplexed oil source control valve group, and the four plunger pumps can supply oil individually or in adjacent combinations.

[0008] The multi-way state control valve group is provided with eight oil inlets A1, B1, A2, B2, A3, B3, A4, B4 and eight oil outlets C1, D1, C2, D2, C3, D3, C4, D4 corresponding to the oil inlets one by one. Between A1 and C1, between B1 and D1, between A2 and C2, between B2 and D2, between A3 and C3, between B3 and D3, between A4 and C4, between B4 and D4, between A1 and C2, between B1 and D2, between A2 and C1, between B2 and D1, between A3 and C4, between B3 and D4, between A4 and C3, and between B4 and D3 are connected respectively through oil circuit electromagnetic ball valves, so that each oil inlet on the multi-way state control valve group is connected to two oil outlets;

[0009] The static test assembly includes two static double-rod oil cylinders corresponding to the oil outlets C1 and D1 and the oil outlets C3 and D3 of the multi-way state control valve group, respectively. The A ports of the two static double-rod oil cylinders are connected to the oil outlets C1 and C3 of the multi-way state control valve group in a one-to-one correspondence, and the B ports of the two static double-rod oil cylinders are connected to the oil outlets D1 and D3 of the multi-way state control valve group in a one-to-one correspondence. In addition, the two static double-rod oil cylinders are connected to a static displacement sensor, a static force sensor and two static pressure sensors.

[0010] The dynamic test assembly includes two dynamic double-rod oil cylinders corresponding to the oil outlets C2 and D2 and the oil outlets C4 and D4 of the multi-way state control valve group, respectively. The A ports of the two dynamic double-rod oil cylinders are connected to the oil outlets C2 and C4 of the multi-way state control valve group in a one-to-one correspondence, and the B ports of the two dynamic double-rod oil cylinders are connected to the oil outlets D2 and D4 of the multi-way state control valve group in a one-to-one correspondence. In addition, the two dynamic double-rod oil cylinders are connected to a dynamic displacement sensor, a dynamic speed sensor and two dynamic pressure sensors.

[0011] The P ports of the four valves under test are connected one-to-one with the oil outlets DE, DF, DG, and DH of the multi-way composite oil source control valve group, and the P ports are also connected to the digital hydraulic accumulator system; the A ports are connected one-to-one with the oil inlets A1, A2, A3, and A4 of the multi-way state control valve group, and the B ports are connected one-to-one with the oil inlets B1, B2, B3, and B4 of the multi-way state control valve group; each set of the multi-way parallel detection system includes two flow meters arranged in parallel, and each group of two flow meters is connected to the T ports of the valves under test in groups of two, and both ends of the parallel connection are connected to the oil tank; the Y ports of the four valves under test are connected to the leakage detection system, and the leakage detection system is connected to the oil tank; the oil outlets DE, DF, DG, and DH of the multi-way composite oil source control valve group are also connected to the corresponding pressure reducing valves, and the X ports of the four valves under test are connected in parallel with the four pressure reducing valves, and a switching electromagnetic ball valve is provided between the pressure reducing valves in groups of two.

[0012] Furthermore, an oil inlet filter is respectively provided between each of the oil inlet one-way valves and the corresponding oil inlet ports DA, DB, DC, and DD on the multi-way composite oil source control valve group. The oil outlet of each oil inlet one-way valve is also connected to a buffer accumulator. The buffer accumulator, oil inlet filter, and unloading valve connected to each oil inlet one-way valve are arranged in parallel, and the oil inlet port of each oil inlet one-way valve is connected to an oil inlet pressure sensor.

[0013] Furthermore, the ten oil source solenoid ball valves on the multi-way composite oil source control valve group are respectively a first oil source solenoid ball valve arranged between DA and DE, a second oil source solenoid ball valve arranged between DB and DF, a third oil source solenoid ball valve arranged between DC and DG, a fourth oil source solenoid ball valve arranged between DD and DH, a fifth oil source solenoid ball valve arranged between DA and DB, a sixth oil source solenoid ball valve arranged between DB and DE, a seventh oil source solenoid ball valve arranged between DB and DC, an eighth oil source solenoid ball valve arranged between DC and DF, a ninth oil source solenoid ball valve arranged between DC and DD, and a tenth oil source solenoid ball valve arranged between DD and DG.

[0014] Furthermore, the four pressure reducing valves are respectively the first pressure reducing valve, the second pressure reducing valve, the third pressure reducing valve and the fourth pressure reducing valve which are connected one by one to the oil outlets DE, DF, DG and DH of the multi-way composite oil source control valve group, and pressure reducing electromagnetic ball valves are respectively provided between the first pressure reducing valve, the second pressure reducing valve, the third pressure reducing valve and the fourth pressure reducing valve and the corresponding oil outlets DE, DF, DG and DH; the X ports of the four tested valves are respectively provided with control electromagnetic ball valves, and the four control electromagnetic ball valves are respectively connected to the first pressure reducing valve, the second pressure reducing valve, the third pressure reducing valve and the fourth pressure reducing valve after being connected in parallel; the switching electromagnetic ball valves are respectively the first switching electromagnetic ball valve arranged between the oil inlet of the first pressure reducing valve and the oil inlet of the second pressure reducing valve, and the second switching electromagnetic ball valve arranged between the oil inlet of the third pressure reducing valve and the oil inlet of the fourth pressure reducing valve.

[0015] Furthermore, the two sets of multi-channel parallel detection systems include a first multi-channel parallel detection system and a second multi-channel parallel detection system, and the first multi-channel parallel detection system and the second multi-channel parallel detection system respectively correspond to two groups of valves to be tested, each group consisting of two valves;

[0016] The two parallel flowmeters in the first multi-way parallel detection system are a first flowmeter and a second flowmeter, and the first flowmeter is connected to a first flow electromagnetic ball valve and a second flow electromagnetic ball valve at both ends respectively, and the second flowmeter is connected to a third flow electromagnetic ball valve and a fourth flow electromagnetic ball valve at both ends respectively; the first flow electromagnetic ball valve and the third flow electromagnetic ball valve are connected in parallel, and after being connected in parallel, they are connected to the T-port of one of the two tested valves corresponding to the first multi-way parallel detection system, and the second flow electromagnetic ball valve and the fourth flow electromagnetic ball valve are connected in parallel, and after being connected in parallel, they are connected to the T-port of the other tested valve; the first flow electromagnetic ball valve and the third flow electromagnetic ball valve are further connected to a first oil outlet electromagnetic ball valve after being connected in parallel, and the second flow electromagnetic ball valve and the fourth flow electromagnetic ball valve are further connected to a second oil outlet electromagnetic ball valve after being connected in parallel, the oil outlets of the first oil outlet electromagnetic ball valve and the second oil outlet electromagnetic ball valve are connected to the oil tank, and the oil inlet of the first oil outlet electromagnetic ball valve and the oil outlet of the second oil outlet electromagnetic ball valve are directly connected to the T-ports of the two corresponding tested valves respectively;

[0017] The two parallel flowmeters in the second multi-way parallel detection system are the third flowmeter and the fourth flowmeter, the two ends of the third flowmeter are respectively connected to the fifth flow electromagnetic ball valve and the sixth flow electromagnetic ball valve, and the two ends of the fourth flowmeter are respectively connected to the seventh flow electromagnetic ball valve and the eighth flow electromagnetic ball valve; the fifth flow electromagnetic ball valve and the seventh flow electromagnetic ball valve are connected in parallel, and after being connected in parallel, they are connected to the T port of one of the two tested valves corresponding to the multi-way parallel detection system, the sixth flow electromagnetic ball valve and the eighth flow electromagnetic ball valve are connected in parallel, and their parallel connection Then it is connected to the T-port of another tested valve; the fifth flow electromagnetic ball valve and the seventh flow electromagnetic ball valve are connected in parallel to the third oil outlet electromagnetic ball valve, and the sixth flow electromagnetic ball valve and the eighth flow electromagnetic ball valve are connected in parallel to the fourth oil outlet electromagnetic ball valve. The oil outlets of the third oil outlet electromagnetic ball valve and the fourth oil outlet electromagnetic ball valve are connected to the oil tank, and the oil inlet of the third oil outlet electromagnetic ball valve and the oil inlet of the fourth oil outlet electromagnetic ball valve are directly connected to the T-ports of the two corresponding tested valves respectively; the T-ports of the four tested valves are respectively connected to flow pressure sensors.

[0018] Furthermore, the digital hydraulic energy storage system includes three accumulators connected in parallel, which are connected to a digital valve group after being connected in parallel, and an energy storage electromagnetic ball valve is provided between each accumulator and the digital valve group; the digital valve group is connected to an energy storage pressure sensor and a fifth flowmeter in sequence, and the P ports of the four tested valves are respectively connected to the fifth flowmeter, and an oil replenishment electromagnetic ball valve is provided between the P port and the fifth flowmeter.

[0019] Furthermore, the leakage detection system includes a small-flow electromagnetic ball valve, a large-flow electromagnetic ball valve and a bypass electromagnetic valve arranged in parallel. The small-flow electromagnetic ball valve, the large-flow electromagnetic ball valve and the bypass electromagnetic valve are connected in parallel to an electromagnetic main valve. The Y ports of the four valves under test are all connected to the electromagnetic main valve, and a leakage electromagnetic ball valve is respectively provided between them and the electromagnetic main valve; the small-flow electromagnetic ball valve is connected to a measuring cup, and the large-flow electromagnetic ball valve is connected to a leakage filter and a sixth flow meter in sequence, and the sixth flow meter and the bypass solenoid valve are connected to the oil tank.

[0020] Furthermore, the oil circuit electromagnetic ball valves on the multi-way state control valve group include a first electromagnetic ball valve arranged between A1 and C1, a second electromagnetic ball valve arranged between B1 and D1, a third electromagnetic ball valve arranged between A2 and C2, a fourth electromagnetic ball valve arranged between B2 and D2, a fifth electromagnetic ball valve arranged between A3 and C3, a sixth electromagnetic ball valve arranged between B3 and D3, a seventh electromagnetic ball valve arranged between A4 and C4, and an eighth electromagnetic ball valve arranged between B4 and D4; also include a ninth electromagnetic ball valve arranged between A1 and C2, a tenth electromagnetic ball valve arranged between B1 and D2, an eleventh electromagnetic ball valve arranged between A2 and C1, a twelfth electromagnetic ball valve and a thirteenth electromagnetic ball valve arranged between B2 and D1 and connected in series; also include a fourteenth electromagnetic ball valve arranged between A3 and C4, a fifteenth electromagnetic ball valve arranged between B3 and D4, a sixteenth electromagnetic ball valve arranged between A4 and C3, and a seventeenth electromagnetic ball valve and an eighteenth electromagnetic ball valve arranged between B4 and D3 and connected in series.

[0021] A reliability test method for a proportional flow valve uses the above-mentioned hydraulic system. According to the test requirements of the valve under test, the pump station system outputs hydraulic oil of different flow rates. The oil circuit switching is composed of the multi-way composite oil source control valve group, two sets of multi-way parallel detection systems, a multi-way state control valve group and a digital hydraulic accumulator system. The tested valve controls the operation of the corresponding static test component and dynamic test component to perform a switching test between static and dynamic tests, simulating actual working conditions and continuously running component test prescribed actions. During the test, data from the static displacement sensor, static force sensor, static pressure sensor, dynamic displacement sensor, dynamic speed sensor, dynamic pressure sensor and flow meter are collected, and the reliability of the valve under test is obtained based on data comparison and abnormal data analysis.

[0022] Furthermore, the method specifically includes the following steps:

[0023] S1. Connecting the hydraulic system to the computer system;

[0024] S2. According to the flow test range of the valve under test, determine the combination of the plunger pumps in the pump station system so that the flow rate meets the test requirements;

[0025] S3, setting the rated working pressure of the corresponding unloading valve, and adjusting the corresponding pressure reducing valve to reach the control pressure value of the X port of the corresponding valve under test;

[0026] S4, determining the path options for the oil inlet and oil outlet of the multiplexed oil source control valve group;

[0027] S5. Determine the flow meter to be used according to the measured flow requirement of the measured valve;

[0028] S6. Determine the oil circuit of the multi-way state control valve group, that is, determine the program option for automatic switching between dynamic test and static test;

[0029] S7. After determining the test parameters in S2-S6, input the parameters and test reliability options into the computer system to confirm that the components of the hydraulic system are working properly, and finally confirm the reliability operation time and the switching frequency of the simulated working condition;

[0030] S8. Start the hydraulic system to begin testing. The computer system records all operating data and outputs a characteristic curve in real time. During the test, the computer system collects real-time data to observe whether the hydraulic system has abnormal pressure fluctuations, abnormal noise, and abnormal temperature changes. If an abnormality occurs in a sample, the reliability impact is determined by comparing the abnormality degree with the collected data sample library, and the cumulative number of abnormalities for the sample is recorded.

[0031] S9. When the number of abnormalities reaches the range for determining reliability failure, the hydraulic system stops working, the valve under test is disassembled and its parts are disassembled and inspected to see whether the wear of each friction pair is normal, and whether there is any grinding, burning, or peeling. After determining the factors related to the failure of the valve under test, the data sample classification library of the computer system is inputted into the computer system to establish a corresponding reliability failure model.

[0032] In summary, the present invention has the following beneficial effects:

[0033] 1. The pump station system is composed of four plunger pumps with different flow and pressure specifications, which can test four valves with different flow specifications at the same time, increasing the sample types of valves to be tested and improving test efficiency;

[0034] 2. Through the multi-channel composite oil source control valve group, two sets of multi-channel parallel detection systems and multi-channel state control valve group joint control loop to achieve continuous operation data detection of simulated working conditions, increasing the number of test samples and saving test switching time;

[0035] 3. Realize specific flow and pressure control output and short-term high flow characteristic test through digital hydraulic accumulator system;

[0036] 4. The state of the valve under test is switched between the static test system and the dynamic test system through the multi-way state control valve group, and the reliability test of the four valves under test is continuously carried out at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of a hydraulic system used for reliability testing of a proportional flow valve.

[0038] In the figure, 1. Pump station system; 11. Oil tank; 12. Heating device; 13. Air filter; 14. Temperature detector; 15. Oil cooling unit; 16. Return oil filter; 21. First plunger pump; 22. Second plunger pump; 23. Third plunger pump; 24. Fourth plunger pump; 25. Oil inlet check valve; 26. Oil inlet pressure sensor; 27. Unloading valve; 28. Oil inlet filter; 29. ​​Buffer accumulator; 3. Multiplex oil source control valve group; 30. Oil outlet pressure sensor; 31. First oil source solenoid ball valve; 32. Second oil source solenoid ball valve; 33. Third oil source solenoid ball valve; 34. Fourth oil source solenoid ball valve; 35. Fifth oil source solenoid ball valve; 36. Sixth oil source solenoid ball valve; 37. Seventh oil source solenoid ball valve; 38 , eighth oil source solenoid ball valve; 39, ninth oil source solenoid ball valve; 310, tenth oil source solenoid ball valve; 4, control solenoid ball valve; 41, first pressure reducing valve; 42, second pressure reducing valve; 43, third pressure reducing valve; 44, fourth pressure reducing valve; 45, pressure reducing solenoid ball valve; 46, first switching solenoid ball valve; 47, second switching solenoid ball valve; 5, first multi-way parallel detection system; 51, first flow meter; 52, second flow meter; 53, first flow solenoid ball valve; 54, second flow solenoid ball valve; 55, third flow solenoid ball valve; 56, fourth flow solenoid ball valve; 57, first oil outlet solenoid ball valve; 58, second oil outlet solenoid ball valve; 6, second multi-way parallel detection system; 61, third flow meter; 62, fourth flow meter; 6 3. Fifth flow solenoid ball valve; 64. Sixth flow solenoid ball valve; 65. Seventh flow solenoid ball valve; 66. Eighth flow solenoid ball valve; 67. Third oil outlet solenoid ball valve; 68. Fourth oil outlet solenoid ball valve; 69. Flow pressure sensor; 7. Digital hydraulic accumulator system; 71. Accumulator; 72. Digital valve group; 73. Accumulator pressure sensor; 74. Fifth flowmeter; 75. Oil replenishment solenoid ball valve; 76. Accumulator solenoid ball valve; 8. Leakage detection system; 81. Small flow solenoid ball valve; 82. Large flow solenoid ball valve; 83. Bypass solenoid valve; 84. Solenoid main valve; 85. Leakage solenoid ball valve; 86. Measuring cup; 87. Leakage filter; 88. Sixth flowmeter; 9. Multi-way state control valve group; 91. First solenoid ball valve Valve; 92, second solenoid ball valve; 93, third solenoid ball valve; 94, fourth solenoid ball valve; 95, fifth solenoid ball valve; 96, sixth solenoid ball valve; 97, seventh solenoid ball valve; 98, eighth solenoid ball valve; 99, ninth solenoid ball valve; 910, tenth solenoid ball valve; 911, eleventh solenoid ball valve; 912, twelfth solenoid ball valve; 913, thirteenth solenoid ball valve; 914, fourteenth solenoid ball valve; 915, fifteenth solenoid ball valve; 916, sixteenth solenoid ball valve; 917, seventeenth solenoid ball valve; 918, eighteenth solenoid ball valve; 919, nineteenth solenoid ball valve; 920, twentieth solenoid ball valve; 01, first valve under test; 02, second valve under test; 03, third valve under test; 04, fourth valve under test;05, first static double-rod cylinder; 051, static displacement sensor; 052, static force sensor; 053, static pressure sensor; 06, second static double-rod cylinder; 07, first dynamic double-rod cylinder; 071, dynamic displacement sensor; 072, dynamic speed sensor; 073, dynamic pressure sensor; 08, second dynamic double-rod cylinder. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] A hydraulic system for reliability testing of proportional flow valves. like Figure 1 As shown, the system includes a pump station system 1, a multiplexed oil source control valve group 3, two multiplexed parallel detection systems, a digital hydraulic accumulator system 7, a leakage detection system 8, a multiplexed state control valve group 9, a static test assembly, and a dynamic test assembly. Four valves under test are located between the multiplexed oil source control valve group 3 and the multiplexed state control valve group 9. These valves can be three-way proportional flow valves of various sizes, such as DN6, DN10, DN25, DN32, DN40, DN50, and DN63. For ease of description, the four valves under test are designated as the first valve under test 01, the second valve under test 02, the third valve under test 03, and the fourth valve under test 04.

[0041] like Figure 1 As shown, the pump station system 1 includes an oil tank 11 and four plunger pumps, which are arranged in parallel and their oil inlets are all connected to the oil tank 11. In this embodiment, ISOVG46 oil is used in the oil tank 11. When the viscosity is in the range of 32±8mm2 / s, the oil temperature varies between 47 and 57°C. A heating device 12 is provided in the oil tank 11, and the oil tank 11 is connected to an oil cooling unit 15. The oil inlet and outlet of the oil cooling unit 15 are both connected to the oil tank 11. The oil tank 11 is also connected to a temperature detector 14 that cooperates with the heating device 12 and the oil cooling unit 15. The temperature detector 14, the heating device 12, and the oil cooling unit 15 are used to control the oil temperature in the oil tank 11 within the range of 50±6°C. In addition, the oil tank 11 is also connected to an air filter 13 and a return oil filter 16 to clean the oil. The basic structures and working principles of the heating device 12, air filter 13, temperature detector 14, oil cooling unit 15 and oil return filter 16 in this embodiment are the same as those in the prior art.

[0042] like Figure 1As shown, the four plunger pumps are the first plunger pump 21, the second plunger pump 22, the third plunger pump 23, and the fourth plunger pump 24. Each plunger pump has a different flow rate and pressure range, and each plunger pump is connected to a variable speed motor. Among them, the flow rate range of the first plunger pump 21 is 4L / min to 30L / min, the flow rate range of the second plunger pump 22 is 15L / min to 100L / min, the flow rate range of the third plunger pump 23 is 20L / min to 150L / min, and the flow rate range of the fourth plunger pump 24 is 30L / min to 250L / min. The pressure ranges of the first plunger pump 21, the second plunger pump 22, and the third plunger pump 23 are all 0 to 31.5Mpa, and the pressure range of the fourth plunger pump 24 is 0 to 25Mpa. The oil outlets of the four plunger pumps are all connected to an oil inlet check valve 25, and an oil inlet pressure sensor 26 is installed between each plunger pump and the corresponding oil inlet check valve 25. The oil inlet check valve 25 prevents back pressure between the four plunger pumps. The oil outlet of each oil inlet check valve 25 is connected to a buffer accumulator 29, an oil inlet filter 28, and an unloading valve 27, which are arranged in parallel. The end of the unloading valve 27 away from the corresponding oil inlet check valve 25 is connected to the oil tank 11. The unloading valve 27 is used to regulate the outlet pressure of the corresponding plunger pump. The oil inlet filter 28 ensures the cleanliness of the hydraulic system oil, and the buffer accumulator 29 ensures stable oil inlet pressure.

[0043] like Figure 1 As shown, the multiplexed oil source control valve assembly 3 is equipped with four oil inlets DA, DB, DC, and DD, and four oil outlets DE, DF, DG, and DH, which are connected to each of the oil inlets in a one-to-one correspondence. The four oil inlets DA, DB, DC, and DD are connected to the oil outlets of four oil inlet check valves 25 through corresponding oil inlet filters 28. The four oil outlets DE, DF, DG, and DH are each connected to a corresponding oil outlet pressure sensor 30. Furthermore, the ports P of the four tested valves are connected to the oil outlets DE, DF, DG, and DH of the multiplexed oil source control valve assembly 3 in a one-to-one correspondence. The four oil inlets DA, DB, DC, and DD are connected to the four oil outlets DE, DF, DG, and DH via ten high-frequency oil source solenoid ball valves. The combination of these oil source solenoid ball valves controls various oil circuits, enabling the first, second, third, and fourth plunger pumps 21, 22, 23, and 24 to supply oil independently or in combination.

[0044] like Figure 1As shown, specifically: a first oil source electromagnetic ball valve 31 is provided between DA and DE, a second oil source electromagnetic ball valve 32 is provided between DB and DF, a third oil source electromagnetic ball valve 33 is provided between DC and DG, and a fourth oil source electromagnetic ball valve 34 is provided between DD and DH; a fifth oil source electromagnetic ball valve 35 is provided between DA and DB, a sixth oil source electromagnetic ball valve 36 is provided between DB and DE, a seventh oil source electromagnetic ball valve 37 is provided between DB and DC, an eighth oil source electromagnetic ball valve 38 is provided between DC and DF, a ninth oil source electromagnetic ball valve 39 is provided between DC and DD, and a tenth oil source electromagnetic ball valve 310 is provided between DD and DG. The first plunger pump 21 is connected to the DA port, the second plunger pump 22 is connected to the DB port, the third plunger pump 23 is connected to the DC port, and the fourth plunger pump 24 is connected to the DD port; the P port of the first tested valve 01 is connected to DE, the P port of the second tested valve 02 is connected to DF, the P port of the third tested valve 03 is connected to DG, and the P port of the fourth tested valve 04 is connected to DH.

[0045] like Figure 1 As shown, when only the first, second, third, and fourth oil source solenoid valves 31, 32, 33, and 34 are open, and the other oil source solenoid valves are closed, the four plunger pumps independently supply oil to the four tested valves. Specifically, the first plunger pump 21 supplies oil to the first tested valve 01, the second plunger pump 22 supplies oil to the second tested valve 02, the third plunger pump 23 supplies oil to the third tested valve 03, and the fourth plunger pump 24 supplies oil to the fourth tested valve 04. If the first oil source solenoid valve 31 malfunctions, the second oil source solenoid valve 32 can be closed, and the fifth and sixth oil source solenoid valves 35, 36 can be opened. The first plunger pump 21 then supplies oil to the first tested valve 01 via DA, DB, and DE. The same applies to the other plunger pumps.

[0046] like Figure 1 As shown, in addition to independent oil supply, multiple plunger pumps can also be combined to supply oil. Taking the first plunger pump 21 and the second plunger pump 22 as an example, the second oil source electromagnetic ball valve 32 and the fifth oil source electromagnetic ball valve 35 can be closed, and the first oil source electromagnetic ball valve 31 and the sixth oil source electromagnetic ball valve 36 can be opened. The first plunger pump 21 and the second plunger pump 22 can be combined to supply oil to the first tested valve 01. Similarly, the first oil source electromagnetic ball valve 31 and the sixth oil source electromagnetic ball valve 36 can be closed, and the second oil source electromagnetic ball valve 32 and the fifth oil source electromagnetic ball valve 35 can be opened. The first plunger pump 21 and the second plunger pump 22 can be combined to supply oil to the second tested valve 02. Similarly, the corresponding oil source electromagnetic ball valves can be controlled to open and close to achieve oil supply from two or three plunger pumps. The same applies to other plunger pumps.

[0047] In addition, if Figure 1As shown, the P ports of the four tested valves are also connected to a digital hydraulic accumulator system 7. This system can independently or in conjunction with the four plunger pumps of the pump station system 1 supply oil to the four tested valves, controlling the input pressure and flow. In this embodiment, the digital hydraulic accumulator system 7 includes three parallel accumulators 71. These three accumulators 71 are connected in parallel to a digital valve group 72, with an energy storage electromagnetic ball valve 76 installed between each accumulator 71 and the digital valve group 72. The digital valve group 72 is in turn connected to an energy storage pressure sensor 73 and a fifth flowmeter 74. The P ports of the four tested valves are respectively connected to the fifth flowmeter 74, and an oil replenishment electromagnetic ball valve 75 is installed between each P port and the fifth flowmeter 74.

[0048] like Figure 1 As shown, in this embodiment, the two sets of multi-way parallel detection systems include a first multi-way parallel detection system 5 corresponding to the first tested valve 01 and the second tested valve 02, and a second multi-way parallel detection system 6 corresponding to the third tested valve 03 and the fourth tested valve 04. Each set of multi-way parallel detection systems includes two parallel flow meters. After being connected in parallel, the two flow meters in the first multi-way parallel detection system 5 are respectively connected to the T ports of the first tested valve 01 and the second tested valve 02. After being connected in parallel, the two flow meters in the second multi-way parallel detection system 6 are respectively connected to the T ports of the third tested valve 03 and the fourth tested valve 04.

[0049] like Figure 1 As shown, specifically: the two parallel flow meters in the first multi-channel parallel detection system 5 are the first flow meter 51 and the second flow meter 52, the first flow meter 51 has a first flow electromagnetic ball valve 53 and a second flow electromagnetic ball valve 54 connected at both ends respectively, and the second flow meter 52 has a third flow electromagnetic ball valve 55 and a fourth flow electromagnetic ball valve 56 connected at both ends respectively; the first flow electromagnetic ball valve 53 and the third flow electromagnetic ball valve 55 are connected in parallel, and after being connected in parallel, they are connected to the T port of the first tested valve 01, the second flow electromagnetic ball valve 54 and the fourth flow electromagnetic ball valve 56 are connected in parallel, and after being connected in parallel, they are connected to the T port of the second tested valve 02. After the first flow electromagnetic ball valve 53 and the third flow electromagnetic ball valve 55 are connected in parallel, they are also connected to the first oil outlet electromagnetic ball valve 57. After the second flow electromagnetic ball valve 54 and the fourth flow electromagnetic ball valve 56 are connected in parallel, they are also connected to the second oil outlet electromagnetic ball valve 58. The oil outlets of the first oil outlet electromagnetic ball valve 57 and the second oil outlet electromagnetic ball valve 58 are connected to the oil tank 11, and the oil inlet of the first oil outlet electromagnetic ball valve 57 is directly connected to the T port of the first tested valve 01, and the oil outlet of the second oil outlet electromagnetic ball valve 58 is directly connected to the T port of the second tested valve 02.

[0050] like Figure 1As shown, the return oil from the T port of the first tested valve 01 has three possible oil routes: one is to return directly to the fuel tank 11 through the first oil outlet solenoid valve 57; the second is to return to the fuel tank 11 through the first flow solenoid valve 53, the first flowmeter 51, the second flow solenoid valve 54, and the second oil outlet solenoid valve 58; and the third is to return to the fuel tank 11 through the third flow solenoid valve 55, the second flowmeter 52, the fourth flow solenoid valve 56, and the second oil outlet solenoid valve 58. Similarly, the return oil from the T port of the second tested valve 02 also has three possible oil routes: one is to return directly to the fuel tank 11 through the second oil outlet solenoid valve 58; the second is to return to the fuel tank 11 through the fourth flow solenoid valve 56, the second flowmeter 52, the third flow solenoid valve 55, and the first oil outlet solenoid valve 57; and the third is to return to the fuel tank 11 through the second flow solenoid valve 54, the first flowmeter 51, the first flow solenoid valve 53, and the first oil outlet solenoid valve 57.

[0051] Under normal conditions, the first valve under test 01 operates in conjunction with the first flowmeter 51, while the second valve under test 02 operates in conjunction with the second flowmeter 52, testing the flow ranges of the first and second valves under test 01 and 02. Of course, depending on the flow ranges of the first and second valves under test 01 and 02, the second flowmeter 52 can be switched for use with the first valve under test 01, or the first flowmeter 51 can be switched for use with the second valve under test 02. Furthermore, the first and second flowmeters 51 and 52 can serve as backup for each other. If the first flowmeter 51 malfunctions, the second flowmeter 52 ensures normal testing of the first valve under test 01, while if the second flowmeter 52 malfunctions, the first flowmeter 51 ensures normal testing of the second valve under test 02.

[0052] like Figure 1 As shown, the two parallel flow meters in the second multi-channel parallel detection system 6 are the third flow meter 61 and the fourth flow meter 62. The two ends of the third flow meter 61 are respectively connected to the fifth flow electromagnetic ball valve 63 and the sixth flow electromagnetic ball valve 64, and the two ends of the fourth flow meter 62 are respectively connected to the seventh flow electromagnetic ball valve 65 and the eighth flow electromagnetic ball valve 66; the fifth flow electromagnetic ball valve 63 and the seventh flow electromagnetic ball valve 65 are connected in parallel, and after being connected in parallel, they are connected to the T port of the third tested valve 03, the sixth flow electromagnetic ball valve 64 and the eighth flow electromagnetic ball valve 66 are connected in parallel, and after being connected in parallel, they are connected to the T port of the fourth tested valve 04. After the fifth flow solenoid ball valve 63 and the seventh flow solenoid ball valve 65 are connected in parallel, they are also connected to the third oil outlet solenoid ball valve 67. After the sixth flow solenoid ball valve 64 and the eighth flow solenoid ball valve 66 are connected in parallel, they are also connected to the fourth oil outlet solenoid ball valve 68. The oil outlets of the third oil outlet solenoid ball valve 67 and the fourth oil outlet solenoid ball valve 68 are connected to the oil tank 11, and the oil inlet of the third oil outlet solenoid ball valve 67 is directly connected to the T port of the third tested valve 03, and the oil inlet of the fourth oil outlet solenoid ball valve 68 is directly connected to the T port of the fourth tested valve 04.

[0053] like Figure 1 As shown, the operating principle of the second multi-way parallel detection system 6 in conjunction with the third and fourth tested valves 03 and 04 for flow detection is the same as the operating principle of the first multi-way parallel detection system 5 in conjunction with the first and second tested valves 01 and 02 for flow detection, and will not be further described. In this embodiment, the measurement range of the first and third flow meters 51 and 61 is 0.6 L / min to 160 L / min, and the measurement range of the second and fourth flow meters 52 and 62 is 1 L / min to 300 L / min. The T-ports of the four tested valves are each connected to a flow pressure sensor 69.

[0054] like Figure 1 As shown, the multi-way state control valve group 9 is provided with eight oil inlets A1, B1, A2, B2, A3, B3, A4, B4 and eight oil outlets C1, D1, C2, D2, C3, D3, C4, D4 corresponding to the oil inlets one by one. The eight oil inlets and the eight oil outlets are connected through eighteen high-frequency response oil circuit electromagnetic ball valves. The combined switching control of the high-frequency response oil circuit electromagnetic ball valves realizes multiple oil circuit controls, and switches the four tested valves between static test and dynamic test continuously and between different working conditions.

[0055] like Figure 1 As shown, specifically: a first electromagnetic ball valve 91 is provided between A1 and C1, a second electromagnetic ball valve 92 is provided between B1 and D1, a third electromagnetic ball valve 93 is provided between A2 and C2, a fourth electromagnetic ball valve 94 is provided between B2 and D2, a fifth electromagnetic ball valve 95 is provided between A3 and C3, a sixth electromagnetic ball valve 96 is provided between B3 and D3, a seventh electromagnetic ball valve 97 is provided between A4 and C4, and an eighth electromagnetic ball valve 98 is provided between B4 and D4. A ninth solenoid ball valve 99 is provided between A1 and C2, a tenth solenoid ball valve 910 is provided between B1 and D2, an eleventh solenoid ball valve 911 is provided between A2 and C1, and a twelfth solenoid ball valve 912 and a thirteenth solenoid ball valve 913 are provided in series between B2 and D1; a fourteenth solenoid ball valve 914 is provided between A3 and C4, a fifteenth solenoid ball valve 915 is provided between B3 and D4, a sixteenth solenoid ball valve 916 is provided between A4 and C3, and a seventeenth solenoid ball valve 917 and an eighteenth solenoid ball valve 918 are provided in series between B4 and D3; in this way, each oil inlet on the multi-way state control valve group 9 is connected to the two oil outlets by switching the corresponding oil circuit solenoid ball valves.

[0056] like Figure 1As shown, the A ports of the four tested valves are connected to the oil inlets A1, A2, A3, and A4 of the multi-way state control valve group 9 in a one-to-one correspondence, and the B ports of the four tested valves are connected to the oil inlets B1, B2, B3, and B4 of the multi-way state control valve group 9 in a one-to-one correspondence. Specifically, the A port of the first tested valve O1 is connected to A1, and the B port is connected to B1. The A port of the second tested valve O2 is connected to A2, and the B port is connected to B2. The A port of the third tested valve O3 is connected to A3, and the B port is connected to B3. The A port of the fourth tested valve O4 is connected to A4, and the B port is connected to B4. Through the electromagnetic control of the four tested valves, the P ports of the tested valves are switched to connect to the A port or the B port, thereby controlling the oil supply to the corresponding oil inlets of the multi-way state control valve group 9.

[0057] like Figure 1 As shown, in this embodiment, the static test assembly includes two static double-rod cylinders, namely a first static double-rod cylinder 05 corresponding to the oil outlets C1 and D1 of the multi-way state control valve group 9, and a second static double-rod cylinder 06 corresponding to the oil outlets C3 and D3. Port A of the first static double-rod cylinder 05 is connected to C1, and port B is connected to D1. Port A of the second static double-rod cylinder 06 is connected to C3, and port B is connected to D3. Both static double-rod cylinders are connected to a static displacement sensor 051, a static force sensor 052, and two static pressure sensors 053. Two groups of four static pressure sensors 053 are connected between port A and C1, between port B and D1 of the first static double-rod cylinder 05, and between port A and C3, and between port B and D3 of the second static double-rod cylinder 06.

[0058] like Figure 1 As shown, the dynamic test assembly includes two dynamic dual-rod cylinders: a first dynamic dual-rod cylinder 07 corresponding to the oil outlets C2 and D2 of the multi-way state control valve assembly 9, and a second dynamic dual-rod cylinder 08 corresponding to the oil outlets C4 and D4. Port A of the first dynamic dual-rod cylinder 07 is connected to C2, and port B is connected to D2. Port A of the second dynamic dual-rod cylinder 08 is connected to C4, and port B is connected to D4. Both dynamic dual-rod cylinders are connected to a dynamic displacement sensor 071, a dynamic velocity sensor 072, and two dynamic pressure sensors 073. Two sets of four dynamic pressure sensors 073 are connected between ports A and C2, and between port B and D2 of the first dynamic dual-rod cylinder 07, and between ports A and C4, and between port B and D4 of the second dynamic dual-rod cylinder 08, respectively.

[0059] like Figure 1As shown, the first tested valve 01, the second tested valve 02, the first multi-way parallel detection system 5, the first static double-rod cylinder 05, and the first dynamic double-rod cylinder 07 form a group, while the third tested valve 03, the fourth tested valve 04, the second multi-way parallel detection system 6, the second static double-rod cylinder 06, and the second dynamic double-rod cylinder 08 form a group. Static and dynamic tests are performed on the four tested valves, respectively. Taking the first tested valve 01, the second tested valve 02, the first static double-rod cylinder 05, and the first dynamic double-rod cylinder 07 as an example, the static and dynamic tests of the first tested valve 01 and the second tested valve 02 are described in detail.

[0060] like Figure 1 As shown, a static test is performed on the first valve under test 01: only the first solenoid ball valve 91 and the second solenoid ball valve 92 are opened. Port A of the first valve under test 01 is connected to port A of the first static double-rod cylinder 05 via the oil inlet A1 of the multi-way state control valve group 9, the first solenoid ball valve 91, and the oil outlet C1. Port B of the first valve under test 01 is connected to port B of the first static double-rod cylinder 05 via the oil inlet B1 of the multi-way state control valve group 9, the second solenoid ball valve 92, and the oil outlet D1. Through electromagnetic control of the first valve under test 01, the connection between port A and port P or between port B and port P is switched, controlling the operation of the first static double-rod cylinder 05 and performing a static test on the first valve under test 01. At the same time, relevant data information is collected through the static displacement sensor 051, static force sensor 052, and two static pressure sensors 053 connected to the first static double-rod cylinder 05.

[0061] like Figure 1 As shown, a dynamic test is performed on the second tested valve 02: only the third solenoid ball valve 93 and the fourth solenoid ball valve 94 are opened. Port A of the second tested valve 02 is connected to port A of the first dynamic double-rod cylinder 07 via the oil inlet A2 of the multi-way state control valve group 9, the third solenoid ball valve 93, and the oil outlet C2. Port B of the second tested valve 02 is connected to port B of the first dynamic double-rod cylinder 07 via the oil inlet B2 of the multi-way state control valve group 9, the fourth solenoid ball valve 94, and the oil outlet D2. Through electromagnetic control of the second tested valve 02, the connection between port A and port P or between port B and port P is switched, controlling the operation of the first dynamic double-rod cylinder 07 and performing a dynamic test on the second tested valve 02. At the same time, relevant data information is collected through the dynamic displacement sensor 071, dynamic speed sensor 072, and two dynamic pressure sensors 073 connected to the first dynamic double-rod cylinder 07.

[0062] like Figure 1As shown, a dynamic test is performed on the first tested valve 01: only the ninth solenoid ball valve 99 and the tenth solenoid ball valve 910 are opened. Port A of the first tested valve 01 is connected to port A of the first dynamic double-rod cylinder 07 via the oil inlet A1 of the multi-way state control valve assembly 9, the ninth solenoid ball valve 99, and the oil outlet C2. Port B of the first tested valve 01 is connected to port B of the first dynamic double-rod cylinder 07 via the oil inlet B1 of the multi-way state control valve assembly 9, the tenth solenoid ball valve 910, and the oil outlet D2. Through electromagnetic control of the first tested valve 01, the connection between port A and port P or between port B and port P is switched, controlling the operation of the first dynamic double-rod cylinder 07 and performing a dynamic test on the first tested valve 01. At the same time, relevant data information is collected via the dynamic displacement sensor 071, dynamic speed sensor 072, and two dynamic pressure sensors 073 connected to the first dynamic double-rod cylinder 07.

[0063] like Figure 1 As shown, a static test is performed on the second tested valve 02: only the eleventh solenoid ball valve 911, the twelfth solenoid ball valve 912, and the thirteenth solenoid ball valve 913 are opened. Port A of the second tested valve 02 is connected to port A of the first static double-rod cylinder 05 via the oil inlet A2 of the multi-way state control valve group 9, the eleventh solenoid ball valve 911, and the oil outlet C1. Port B of the second tested valve 02 is connected to port B of the first static double-rod cylinder 05 via the oil inlet B2 of the multi-way state control valve group 9, the second solenoid ball valve 92, the thirteenth solenoid ball valve 913, and the oil outlet D1. Through electromagnetic control of the second tested valve 02, the connection between port A and port P or between port B and port P is switched, controlling the operation of the first static double-rod cylinder 05 and performing a static test on the second tested valve 02. At the same time, relevant data information is collected via the static displacement sensor 051, static force sensor 052, and two static pressure sensors 053 connected to the first static double-rod cylinder 05.

[0064] like Figure 1 As shown, the static test of the first tested valve 01 and the dynamic test of the second tested valve 02 can be performed simultaneously, and the dynamic test of the first tested valve 01 and the static test of the second tested valve 02 can be performed simultaneously. Similarly, the static test of the third tested valve 03, the dynamic test of the fourth tested valve 04, the dynamic test of the third tested valve 03, and the static test of the fourth tested valve 04 can be performed.

[0065] like Figure 1As shown, in addition, in this embodiment, a nineteenth electromagnetic ball valve 919 is further provided between the oil inlet B1 and the oil outlet D2 of the multi-way state control valve group 9, and the nineteenth electromagnetic ball valve 919 is arranged in parallel with the tenth electromagnetic ball valve 910; a twentieth electromagnetic ball valve 920 is further provided between the oil inlet B3 and the oil outlet D4, and the twentieth electromagnetic ball valve 920 is arranged in parallel with the fifteenth electromagnetic ball valve 915. In this way, the nineteenth electromagnetic ball valve 919 and the tenth electromagnetic ball valve 910 serve as backup for each other, and the twentieth electromagnetic ball valve 920 and the fifteenth electromagnetic ball valve 915 serve as backup for each other.

[0066] like Figure 1 As shown, the Y-ports of the four tested valves are all connected to a leakage detection system 8, which is also connected to the fuel tank 11. Leakage detection system 8 detects leakage in the four tested valves. Specifically, leakage detection system 8 includes a low-flow electromagnetic ball valve 81, a high-flow electromagnetic ball valve 82, and a bypass electromagnetic valve 83 arranged in parallel. The low-flow electromagnetic ball valve 81, the high-flow electromagnetic ball valve 82, and the bypass electromagnetic valve 83 are connected in parallel to an electromagnetic main valve 84. The Y-ports of the four tested valves are all connected to the electromagnetic main valve 84, and a leakage electromagnetic ball valve 85 is respectively installed between the low-flow electromagnetic ball valve 81 and the electromagnetic main valve 84. A measuring cup 86 is connected to the low-flow electromagnetic ball valve 81, and a leakage filter 87 and a sixth flowmeter 88 are connected to the sixth flowmeter 88 in sequence. The sixth flowmeter 88 and the bypass electromagnetic valve 83 are connected to the fuel tank 11. The branch formed by the low-flow electromagnetic ball valve 81 and the measuring cup 86 is used for micro-leak detection and is used when the leaking oil flow rate is insufficient to be detected by the sixth flowmeter 88. The branch composed of the large-flow electromagnetic ball valve 82, the leakage filter 87, and the sixth flowmeter 88 is for large-flow leakage detection, and the branch of the bypass electromagnetic valve 83 is a normal drainage branch.

[0067] like Figure 1As shown, the oil outlets DE, DF, DG, and DH of the multiplexed oil source control valve group 3 are each connected to a corresponding pressure reducing valve. The X ports of the four tested valves are connected in parallel to the four pressure reducing valves, and switching solenoid ball valves are installed between each pair of pressure reducing valves. Specifically, the four pressure reducing valves are a first pressure reducing valve 41, a second pressure reducing valve 42, a third pressure reducing valve 43, and a fourth pressure reducing valve 44, which are connected in a one-to-one correspondence to the oil outlets DE, DF, DG, and DH of the multiplexed oil source control valve group 3. Pressure reducing solenoid ball valves 45 are installed between the first pressure reducing valve 41, the second pressure reducing valve 42, the third pressure reducing valve 43, and the fourth pressure reducing valve 44 and their corresponding oil outlets DE, DF, DG, and DH. The X ports of the four tested valves are each equipped with a control solenoid ball valve 4, which is connected in parallel to the first pressure reducing valve 41, the second pressure reducing valve 42, the third pressure reducing valve 43, and the fourth pressure reducing valve 44, respectively. The switching solenoid valves are a first switching solenoid valve 46, located between the oil inlet of the first pressure-reducing valve 41 and the oil inlet of the second pressure-reducing valve 42, and a second switching solenoid valve 47, located between the oil inlet of the third pressure-reducing valve 43 and the oil inlet of the fourth pressure-reducing valve 44. The four pressure-reducing valves are used to control the pressure of the four valves under test. The corresponding control solenoid valves 4 and pressure-reducing solenoid valves 45 can be opened and closed according to actual usage requirements. The first pressure-reducing valve 41 and the second pressure-reducing valve 42 serve as backup for each other through the first switching solenoid valve 46, and the third pressure-reducing valve 43 and the fourth pressure-reducing valve 44 serve as backup for each other through the second switching solenoid valve 47.

[0068] A proportional flow valve reliability test method, using the proportional flow valve reliability test hydraulic system, such as Figure 1 As shown, without replacing the test valve platform (i.e., the test platform where the hydraulic system is located, which is conventional), the four valves under test are equipped with hydraulic oil at different flow rates according to the test requirements of the valves under test. The hydraulic oil is switched by the multi-way composite oil source control valve group 3, two sets of multi-way parallel detection systems, a multi-way state control valve group 9, and a digital hydraulic accumulator system 7. The tested valves control the operation of the corresponding static test components and dynamic test components to conduct a switching test between static and dynamic tests, simulating actual working conditions and continuously operating the component test specified actions. During the test, data from the static displacement sensor 051, static force sensor 052, static pressure sensor 053, dynamic displacement sensor 071, dynamic velocity sensor 072, dynamic pressure sensor 073, and flowmeter are collected. The reliability of the valves under test is determined by data comparison and abnormal data analysis. During the test, the test can be repeated continuously to increase the number of samples and improve the accuracy of the test results.

[0069] like Figure 1 As shown, the following steps are specifically included and are described in detail using the first tested valve 01 as an example:

[0070] S1. Connect the hydraulic system to the computer system. The hydraulic system is equipped with power lines, control lines, and sensor lines for power supply. It is then connected to the computer system used for testing on the operating platform. All sensor and temperature signals are input into the computer system. The computer system is based on a CPCI bus-based integrated industrial control computer solution. Control commands and A / D acquisition data are transmitted via the CPCI bus, meeting standard instrument accuracy requirements. The computer system records and stores data in real time, outputting characteristic curves such as flow-pressure curves, differential pressure curves, and internal leakage characteristic curves. All command actions and sequential execution records for multi-sample reliability testing are recorded and stored, allowing for comparison of sample test data classification. The test computer system is state-of-the-art and will not be described in detail.

[0071] S2. According to the flow test range of the valve under test, determine the combination of the plunger pumps in the pump station system 1 so that its flow meets the test requirements; according to the flow test range of the first valve under test 01, determine whether to use the first plunger pump 21 alone to supply oil or the first plunger pump 21 and the second plunger pump 22 in combination to supply oil. You can also choose to supplement the oil supply with the digital hydraulic accumulator system 7 to ensure that the oil supply flow can meet the flow test requirements of the first valve under test 01.

[0072] S3. Set the rated working pressure of the corresponding unloading valve 27, and adjust the corresponding pressure reducing valve to reach the control pressure value of the X port of the corresponding tested valve; set the rated working pressure of the corresponding unloading valve 27 according to the selected plunger pump, and adjust the working pressure of the corresponding plunger pump to ensure the test pressure of the first tested valve 01; at the same time, use the first pressure reducing valve 41 to adjust the control pressure of the X port of the first tested valve 01 to ensure the pressure stability of the first tested valve 01; of course, if the first pressure reducing valve 41 fails, other pressure reducing valves can also be selected to adjust the control pressure of the X port of the first tested valve 01.

[0073] S4. Determine the path options for the oil inlet and oil outlet of the multiplexed oil source control valve group 3; if only the first plunger pump 21 is selected in S2 to supply oil to the first tested valve 01, the oil inlet DA and the oil outlet DE of the multiplexed oil source control valve group 3 are controlled to be connected; if the first plunger pump 21 and the second plunger pump 22 are combined to supply oil to the first tested valve 01 in S2, the oil inlet DA and the oil outlet DE of the multiplexed oil source control valve group 3 are controlled to be connected, and the oil inlet DB is also connected to the oil outlet DE.

[0074] S5. Determine the flow meter to be used based on the measured flow demand of the tested valve; based on the measured flow demand of the first tested valve 01, select whether to use the first flow meter 51 or the second flow meter 52. If the first flow meter 51 is used, the first flow electromagnetic ball valve 53, the second flow electromagnetic ball valve 54 and the second oil outlet electromagnetic ball valve 58 need to be opened. If the second flow meter 52 is used, the third flow electromagnetic ball valve 55, the fourth flow electromagnetic ball valve 56 and the first oil outlet electromagnetic ball valve 57 need to be opened.

[0075] S6. Determine the oil circuit of the multi-way state control valve group 9, that is, determine the program option for automatic switching between dynamic testing and static testing; when performing a static test on the first valve under test 01, the A1 port and the C1 port of the multi-way state control valve group 9 are connected, and the B1 port and the D1 port are connected, that is, the corresponding first electromagnetic ball valve 91 and the second electromagnetic ball valve 92 are opened, and the first static double-rod oil cylinder 05 is driven to operate through the electromagnetic switching of the first valve under test 01, and a static test of the first valve under test 01 is performed, and the static characteristics of the first valve under test 01 are analyzed based on the feedback results of the static displacement sensor 051, the static force sensor 052 and the two static pressure sensors 053 on the first static double-rod oil cylinder 05. When performing a dynamic test on the first valve under test 01, the A1 port and the C2 port of the multi-way state control valve group 9 are connected, and the B1 port and the D2 port are connected, that is, the corresponding ninth electromagnetic ball valve 99, the tenth electromagnetic ball valve 910 or the nineteenth electromagnetic ball valve 919 is opened, and the first dynamic double-rod cylinder 07 is driven to operate through the electromagnetic switching of the first valve under test 01, and the dynamic test of the first valve under test 01 is performed, and the dynamic characteristics of the first valve under test 01 are analyzed based on the feedback results of the dynamic displacement sensor 071, the dynamic speed sensor 072 and the two dynamic pressure sensors 073 on the first dynamic double-rod cylinder 07.

[0076] S7. After determining the test parameters in S2-S6, input the parameters and test reliability options into the computer system, confirm that each component in the hydraulic system is working normally, and finally confirm the reliability operation time and the switching frequency of the simulated working condition; input the various test parameters determined in S2-S6 into the computer system, confirm that each component involved in the static test and dynamic test of the first tested valve 01 can work normally, select the reliability test in the computer system, and confirm the reliability operation time and the switching frequency of the first static double-rod cylinder 05 and the first dynamic double-rod cylinder 07.

[0077] S8. Start the hydraulic system and begin the test. The computer system records all operating data and outputs the characteristic curve in real time. During the test, the hydraulic system is observed through real-time data collection to see if there are any abnormal pressure fluctuations, abnormal noise, and abnormal temperature changes. If an abnormality occurs in a sample, the degree of abnormality is compared with the collected data sample library to determine the reliability impact, and the cumulative number of abnormalities for the sample is recorded.

[0078] S9. When the number of abnormalities reaches the range of reliability failure, the hydraulic system stops working, the valve under test is disassembled and its parts are disassembled for inspection to check whether the wear of each friction pair is normal, whether there is grinding, burning, peeling and other phenomena. After determining the factors related to the failure of the valve under test, input the data sample classification library of the computer system to establish the corresponding reliability failure model.

[0079] When conducting simulation tests of similar specifications and models or similar working conditions, repeat steps S1-S9 to increase test sample data; the computer system archives the signal data of each sensor, and extracts the reliability characteristic data of the tested valve by comparing and analyzing the test sample data.

[0080] The present invention forms a pump station system 1 by four plunger pumps with different flow and pressure specifications, which can be used to test four valves under test with different flow specifications at the same time, thereby increasing the sample types of the valves under test and improving the test efficiency; through the multi-way composite oil source control valve group 3, two sets of multi-way parallel detection systems and the multi-way state control valve group 9, the continuous operation data detection of the simulated working conditions is realized by the joint control loop, thereby increasing the number of test samples and saving the test switching time; the specific flow and pressure control output and short-term high flow characteristic test are realized by the digital hydraulic accumulator system 7; the state conversion of the valve under test between the static test system and the dynamic test system is switched by the multi-way state control valve group 9, thereby realizing continuous reliability testing of the four valves under test.

[0081] The foregoing description shows and describes preferred embodiments of the present invention. As before, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed to exclude other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A hydraulic system for reliability testing of a proportional flow valve, characterized by: The invention comprises a pump station system (1), a multi-way composite oil source control valve group (3), two sets of multi-way parallel detection systems, a digital hydraulic energy storage system (7), a leakage detection system (8), a multi-way state control valve group (9), a static test component and a dynamic test component, wherein four valves to be tested are arranged between the multi-way composite oil source control valve group (3) and the multi-way state control valve group (9); The pump station system (1) comprises an oil tank (11) and four parallel plunger pumps with different flow ranges, wherein the oil inlets of the four plunger pumps are respectively connected to the oil tank (11), and the oil outlets are respectively connected to an oil inlet check valve (25), and an unloading valve (27) is connected between the oil outlet of each oil inlet check valve (25) and the oil tank (11); The multi-way composite oil source control valve group (3) is provided with four oil inlets DA, DB, DC, DD and four oil outlets DE, DF, DG, DH which are in one-to-one communication with the oil inlets. The four oil inlets DA, DB, DC, DD are in one-to-one communication with the oil outlets of the four oil inlet check valves (25). The four oil outlets DE, DF, DG, DH are connected to oil outlet pressure sensors (30) which are in one-to-one communication with them. DA and DE, DB and DF, DC and DG, DD and DH, DA and DB, DB and DE, DB and DC, DC and DF, DC and DD, and DD and DG are connected via oil source electromagnetic ball valves. The ten oil source electromagnetic ball valves form multiple oil paths between the eight oil ports on the multi-way composite oil source control valve group (3). The four plunger pumps can supply oil individually or in adjacent combination. The multi-way state control valve group (9) is provided with eight oil inlets A1, B1, A2, B2, A3, B3, A4, B4 and eight oil outlets C1, D1, C2, D2, C3, D3, C4, D4 corresponding to the oil inlets. A1 and C1, B1 and D1, A2 and C2, B2 and D2, A3 and C3, B3 and D3, A4 and C4, B4 and D4, A1 and C2, B1 and D2, A2 and C1, B2 and D1, A3 and C4, B3 and D4, A4 and C3, and B4 and D3 are connected via oil circuit electromagnetic ball valves, so that each oil inlet on the multi-way state control valve group (9) is connected to two oil outlets. The static test assembly comprises two static double-rod oil cylinders corresponding to the oil outlets C1 and D1 and the oil outlets C3 and D3 of the multi-way state control valve group (9), the A ports of the two static double-rod oil cylinders are connected to the oil outlets C1 and C3 of the multi-way state control valve group (9) in a one-to-one correspondence, the B ports of the two static double-rod oil cylinders are connected to the oil outlets D1 and D3 of the multi-way state control valve group (9) in a one-to-one correspondence, and the two static double-rod oil cylinders are connected to a static displacement sensor (051), a static force sensor (052) and two static pressure sensors (053); The dynamic test assembly comprises two dynamic double-rod oil cylinders corresponding to the oil outlets C2 and D2 and the oil outlets C4 and D4 of the multi-way state control valve group (9), respectively; the A ports of the two dynamic double-rod oil cylinders are connected to the oil outlets C2 and C4 of the multi-way state control valve group (9) in a one-to-one correspondence; the B ports of the two dynamic double-rod oil cylinders are connected to the oil outlets D2 and D4 of the multi-way state control valve group (9) in a one-to-one correspondence; and the two dynamic double-rod oil cylinders are connected to a dynamic displacement sensor (071), a dynamic speed sensor (072) and two dynamic pressure sensors (073); The P ports of the four valves to be tested are connected to the oil outlets DE, DF, DG, and DH of the multi-way composite oil source control valve group (3) in a one-to-one correspondence, and the P ports are also connected to the digital hydraulic accumulator system (7); the A ports are connected to the oil inlets A1, A2, A3, and A4 of the multi-way state control valve group (9) in a one-to-one correspondence, and the B ports are connected to the oil inlets B1, B2, B3, and B4 of the multi-way state control valve group (9) in a one-to-one correspondence; each set of the multi-way parallel detection system includes two flow meters arranged in parallel, and each set of two flow meters After being connected in parallel, the four valves are connected to the T ports of the valves to be tested in groups of two, and both ends of the valves are connected to the oil tank (11); the Y ports of the four valves to be tested are connected to the leakage detection system (8), and the leakage detection system (8) is connected to the oil tank (11); the oil outlets DE, DF, DG, and DH of the multiplexed oil source control valve group (3) are also connected to pressure reducing valves corresponding thereto, and the X ports of the four valves to be tested are connected to the four pressure reducing valves in groups of two, and a switching electromagnetic ball valve is provided between the pressure reducing valves in groups of two.

2. A hydraulic system for reliability testing of a proportional flow valve according to claim 1, characterized in that: An oil inlet filter (28) is provided between each of the oil inlet check valves (25) and the oil inlet ports DA, DB, DC, and DD corresponding thereto on the multiplexed oil source control valve group (3). The oil outlet of each of the oil inlet check valves (25) is also connected to a buffer accumulator (29). The buffer accumulator (29), the oil inlet filter (28), and the unloading valve (27) connected to each of the oil inlet check valves (25) are arranged in parallel. The oil inlet of each of the oil inlet check valves (25) is connected to an oil inlet pressure sensor (26).

3. A hydraulic system for reliability testing of a proportional flow valve according to claim 1, characterized in that: The ten oil source electromagnetic ball valves on the multiplexed oil source control valve group (3) are respectively a first oil source electromagnetic ball valve (31) arranged between DA and DE, a second oil source electromagnetic ball valve (32) arranged between DB and DF, a third oil source electromagnetic ball valve (33) arranged between DC and DG, a fourth oil source electromagnetic ball valve (34) arranged between DD and DH, a fifth oil source electromagnetic ball valve (35) arranged between DA and DB, a sixth oil source electromagnetic ball valve (36) arranged between DB and DE, a seventh oil source electromagnetic ball valve (37) arranged between DB and DC, an eighth oil source electromagnetic ball valve (38) arranged between DC and DF, a ninth oil source electromagnetic ball valve (39) arranged between DC and DD, and a tenth oil source electromagnetic ball valve (310) arranged between DD and DG.

4. A hydraulic system for reliability testing of a proportional flow valve according to claim 1, characterized in that: The four pressure reducing valves are respectively a first pressure reducing valve (41), a second pressure reducing valve (42), a third pressure reducing valve (43) and a fourth pressure reducing valve (44) which are connected to the oil outlets DE, DF, DG and DH of the multi-way composite oil source control valve group (3) in a one-to-one correspondence; a pressure reducing electromagnetic ball valve (45) is respectively provided between the first pressure reducing valve (41), the second pressure reducing valve (42), the third pressure reducing valve (43) and the fourth pressure reducing valve (44) and the corresponding oil outlets DE, DF, DG and DH; the X ports of the four valves to be tested are respectively A control electromagnetic ball valve (4) is provided. Four of the control electromagnetic ball valves (4) are connected in parallel and are respectively connected to a first pressure reducing valve (41), a second pressure reducing valve (42), a third pressure reducing valve (43) and a fourth pressure reducing valve (44); the switching electromagnetic ball valves are respectively a first switching electromagnetic ball valve (46) arranged between the oil inlet of the first pressure reducing valve (41) and the oil inlet of the second pressure reducing valve (42), and a second switching electromagnetic ball valve (47) arranged between the oil inlet of the third pressure reducing valve (43) and the oil inlet of the fourth pressure reducing valve (44).

5. The hydraulic system for reliability testing of a proportional flow valve according to claim 1, characterized in that: The two sets of multi-way parallel detection systems include a first multi-way parallel detection system (5) and a second multi-way parallel detection system (6), wherein the first multi-way parallel detection system (5) and the second multi-way parallel detection system (6) respectively correspond to two groups of valves to be tested, each group being two; The two parallel flowmeters in the first multi-way parallel detection system (5) are a first flowmeter (51) and a second flowmeter (52), the two ends of the first flowmeter (51) are respectively connected to a first flow electromagnetic ball valve (53) and a second flow electromagnetic ball valve (54), and the two ends of the second flowmeter (52) are respectively connected to a third flow electromagnetic ball valve (55) and a fourth flow electromagnetic ball valve (56); the first flow electromagnetic ball valve (53) and the third flow electromagnetic ball valve (55) are connected in parallel, and after being connected in parallel, they are connected to the T port of one of the two valves to be tested corresponding to the first multi-way parallel detection system (5), and the second flow electromagnetic ball valve (54) is connected to the fourth flow electromagnetic ball valve (56). The flow electromagnetic ball valves (56) are connected in parallel and are connected to the T-port of another valve under test after being connected in parallel; the first flow electromagnetic ball valve (53) and the third flow electromagnetic ball valve (55) are further connected to a first oil outlet electromagnetic ball valve (57) after being connected in parallel; the second flow electromagnetic ball valve (54) and the fourth flow electromagnetic ball valve (56) are further connected to a second oil outlet electromagnetic ball valve (58) after being connected in parallel; the oil outlets of the first oil outlet electromagnetic ball valve (57) and the second oil outlet electromagnetic ball valve (58) are connected to the oil tank (11), and the oil inlet of the first oil outlet electromagnetic ball valve (57) and the oil outlet of the second oil outlet electromagnetic ball valve (58) are directly connected to the T-ports of the two corresponding valves under test respectively; The two parallel flowmeters in the second multi-way parallel detection system (6) are a third flowmeter (61) and a fourth flowmeter (62); the two ends of the third flowmeter (61) are respectively connected to a fifth flow electromagnetic ball valve (63) and a sixth flow electromagnetic ball valve (64); the two ends of the fourth flowmeter (62) are respectively connected to a seventh flow electromagnetic ball valve (65) and an eighth flow electromagnetic ball valve (66); the fifth flow electromagnetic ball valve (63) and the seventh flow electromagnetic ball valve (65) are connected in parallel, and after being connected in parallel, they are connected to the T port of one of the two valves to be tested corresponding to the second multi-way parallel detection system (6); the sixth flow electromagnetic ball valve (64) and the eighth flow electromagnetic ball valve (66) are connected in parallel, and After being connected in parallel, they are connected to the T-port of another valve under test; the fifth flow electromagnetic ball valve (63) and the seventh flow electromagnetic ball valve (65) are further connected to the third oil outlet electromagnetic ball valve (67) after being connected in parallel; the sixth flow electromagnetic ball valve (64) and the eighth flow electromagnetic ball valve (66) are further connected to the fourth oil outlet electromagnetic ball valve (68) after being connected in parallel; the oil outlets of the third oil outlet electromagnetic ball valve (67) and the fourth oil outlet electromagnetic ball valve (68) are connected to the oil tank (11), and the oil inlet of the third oil outlet electromagnetic ball valve (67) and the oil inlet of the fourth oil outlet electromagnetic ball valve (68) are directly connected to the T-ports of the two corresponding valves under test; the T-ports of the four valves under test are respectively connected to flow pressure sensors (69).

6. The hydraulic system for reliability testing of a proportional flow valve according to claim 1, characterized in that: The digital hydraulic accumulator system (7) comprises three accumulators (71) connected in parallel, wherein the three accumulators (71) are connected in parallel to a digital valve group (72), and an accumulator electromagnetic ball valve (76) is provided between each accumulator (71) and the digital valve group (72); the digital valve group (72) is connected in sequence to an accumulator pressure sensor (73) and a fifth flow meter (74), the P ports of the four tested valves are respectively connected to the fifth flow meter (74), and an oil replenishing electromagnetic ball valve (75) is provided between the P port and the fifth flow meter (74).

7. The hydraulic system for reliability testing of a proportional flow valve according to claim 1, characterized in that: The leakage detection system (8) comprises a small flow electromagnetic ball valve (81), a large flow electromagnetic ball valve (82) and a bypass electromagnetic valve (83) arranged in parallel. The small flow electromagnetic ball valve (81), the large flow electromagnetic ball valve (82) and the bypass electromagnetic valve (83) are connected in parallel to an electromagnetic main valve (84). The Y ports of the four valves to be tested are all connected to the electromagnetic main valve (84), and a leakage electromagnetic ball valve (85) is respectively provided between the Y ports and the electromagnetic main valve (84). The small flow electromagnetic ball valve (81) is connected to a measuring cup (86), and the large flow electromagnetic ball valve (82) is sequentially connected to a leakage filter (87) and a sixth flow meter (88). The sixth flow meter (88) and the bypass electromagnetic valve (83) are connected to an oil tank (11).

8. The hydraulic system for reliability testing of a proportional flow valve according to claim 1, characterized in that: The oil circuit electromagnetic ball valves on the multi-way state control valve group (9) include a first electromagnetic ball valve (91) arranged between A1 and C1, a second electromagnetic ball valve (92) arranged between B1 and D1, a third electromagnetic ball valve (93) arranged between A2 and C2, a fourth electromagnetic ball valve (94) arranged between B2 and D2, a fifth electromagnetic ball valve (95) arranged between A3 and C3, a sixth electromagnetic ball valve (96) arranged between B3 and D3, a seventh electromagnetic ball valve (97) arranged between A4 and C4, and an eighth electromagnetic ball valve (98) arranged between B4 and D4; and further include a valve arranged between A1 and C2. a ninth electromagnetic ball valve (99), a tenth electromagnetic ball valve (910) arranged between B1 and D2, an eleventh electromagnetic ball valve (911) arranged between A2 and C1, a twelfth electromagnetic ball valve (912) and a thirteenth electromagnetic ball valve (913) arranged between B2 and D1 and connected in series; and further comprising a fourteenth electromagnetic ball valve (914) arranged between A3 and C4, a fifteenth electromagnetic ball valve (915) arranged between B3 and D4, a sixteenth electromagnetic ball valve (916) arranged between A4 and C3, a seventeenth electromagnetic ball valve (917) and an eighteenth electromagnetic ball valve (918) arranged between B4 and D3 and connected in series.

9. A proportional flow valve reliability test method, characterized by: Using the hydraulic system described in any one of claims 1 to 8, according to the test requirements of the valve under test, the pump station system (1) outputs hydraulic oil of different flow rates, and the oil circuit switching is composed of the multi-way composite oil source control valve group (3), two sets of multi-way parallel detection systems, the multi-way state control valve group (9) and the digital hydraulic accumulator system (7). The tested valve controls the operation of the corresponding static test component and the dynamic test component, and performs a switching test between static test and dynamic test, simulating actual working conditions and continuous operation of the component test prescribed actions. During the test, data from the static displacement sensor (051), the static force sensor (052), the static pressure sensor (053), the dynamic displacement sensor (071), the dynamic speed sensor (072), the dynamic pressure sensor (073) and the flow meter are collected, and the reliability of the valve under test is obtained based on data comparison and abnormal data analysis.

10. A proportional flow valve reliability test method according to claim 9, characterized in that: The specific steps include: S1. Connecting the hydraulic system to the computer system; S2. According to the flow test range of the valve under test, determine the combination of the plunger pumps in the pump station system (1) so that the flow rate meets the test requirements; S3, setting the rated working pressure of the corresponding unloading valve (27), and adjusting the corresponding pressure reducing valve to reach the control pressure value of the X port of the corresponding valve to be tested; S4, determining the passage options for the oil inlet and the oil outlet of the multi-way composite oil source control valve group (3); S5. Determine the flow meter to be used according to the measured flow requirement of the measured valve; S6, determining the oil circuit of the multi-way state control valve group (9), that is, determining the program option for automatic switching between dynamic test and static test; S7. After determining the test parameters in S2-S6, input the parameters and test reliability options into the computer system to confirm that the components of the hydraulic system are working properly, and finally confirm the reliability operation time and the switching frequency of the simulated working condition; S8. Start the hydraulic system to begin testing. The computer system records all operating data and outputs a characteristic curve in real time. During the test, the computer system collects real-time data to observe whether the hydraulic system has abnormal pressure fluctuations, abnormal noise, and abnormal temperature changes. If an abnormality occurs in a sample, the reliability impact is determined by comparing the abnormality degree with the collected data sample library, and the cumulative number of abnormalities for the sample is recorded. S9. When the number of abnormalities reaches the range for determining reliability failure, the hydraulic system stops working, the valve under test is disassembled and its parts are disassembled and inspected to see whether the wear of each friction pair is normal, and whether there is any grinding, burning, or peeling. After determining the factors related to the failure of the valve under test, the data sample classification library of the computer system is inputted into the computer system to establish a corresponding reliability failure model.

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