A hydraulic directional valve test system and method

Abstract

The application provides a hydraulic directional valve test system and method, which comprises a hydraulic pump station system for providing hydraulic power during a test process; the hydraulic pump station system comprises an oil tank system, the oil tank system is connected with a first main pump motor set system and a second main pump motor set system in parallel, the first main pump motor set system is used for providing hydraulic power for a first test system, and the second main pump motor set system is used for providing hydraulic power for a second test system; a control pump motor set system is connected to the oil tank system and is used for providing hydraulic power for a third test system; and the first test system, the second test system and the third test system are connected with a control valve test bench system used for testing a valve to be tested. Through the test system, different functions of different valves can be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of performance detection of hydraulic systems in hydropower stations, and in particular to a hydraulic directional valve test system and method. Background Art

[0002] The hydraulic system of a hydropower station is an important power unit and control unit for opening and closing the gates of the hydropower station. The hydraulic control valve is the smallest unit of the hydraulic system. Its quality directly determines the safety and reliability of the hydraulic system itself. Therefore, understanding the performance indicators of different valve groups and performing performance testing on different valves can greatly assist equipment management departments in understanding the status of the hydraulic control valves and then carrying out planned inspection and maintenance work.

[0003] Currently, maintenance personnel rely solely on experience to judge valve failures and performance, or determine whether a valve is normal after installation based on whether it meets on-site operating conditions. Without specific data analysis, they cannot determine whether a newly purchased valve has problems, and there is no quantitative data to support the actual performance of the old valve after removal. Summary of the Invention

[0004] Based on the deficiencies in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a hydraulic directional valve test system and method. This system takes the test and inspection of electromagnetic reversing valves, electromagnetic ball valves, and proportional reversing valves used in power stations as the starting point, and designs a hydraulic control valve test system. Through this test system, different functions of different valves can be tested, including internal leakage test and steady-state pressure difference-flow characteristic test of electromagnetic reversing valves and electromagnetic ball valves; internal leakage test, output flow-input signal characteristic test, threshold characteristic test, throttling adjustment characteristic test, output flow-load pressure difference characteristic test, output flow-valve pressure drop characteristic test, limit power characteristic test, pressure zero drift, fault protection function test, dynamic test and other parameters of servo valves and proportional valves. Different valves can be tested on one test system, which is helpful to understand whether the performance of old valves and newly purchased valves meet on-site requirements and quality assessment, and greatly assists the maintenance and repair of hydraulic equipment.

[0005] In order to achieve the above technical features, the object of the present invention is achieved as follows: a hydraulic directional valve test system includes a hydraulic pump station system for providing hydraulic power during the test process;

[0006] The hydraulic pump station system includes an oil tank system, to which a first main pump-motor system and a second main pump-motor system are connected in parallel. The first main pump-motor system is used to provide hydraulic power for the first test system, and the second main pump-motor system is used to provide hydraulic power for the second test system; the oil tank system is connected to a control pump-motor system, which is used to provide hydraulic power for the third test system;

[0007] The first test system, the second test system and the third test system are connected to a control valve test bench system for testing the valve to be tested.

[0008] Preferably, the entire hydraulic pump station system is arranged inside the valve station pump station room;

[0009] The oil tank system includes a main oil tank, which is equipped with multiple oil drain ball valves, multiple groups of heaters are arranged inside the main oil tank, and the main oil tank is also equipped with a liquid level sensor, a visual liquid level gauge, a temperature sensor, an oil return filter, an oil filling filter and an oil sampling ball valve.

[0010] Preferably, the main oil tank is connected to a cooling circulation device for cooling the oil, and the cooling circulation device includes a switch signaling ball valve connected to the main oil tank, the switch signaling ball valve is connected to the cooling pump motor unit through a first flexible joint, the outlet of the cooling pump motor unit is connected to the cooler through a first one-way valve, the outlet of the cooler is connected in parallel with a first ball valve, and the first ball valve is connected to the main oil tank through a filter.

[0011] Preferably, the cooler adopts a plate cooler, which is connected to a water inlet ball valve for cooling water to enter, an electromagnetic water valve is installed on the pipeline after the water inlet ball valve, and the cooling water outlet of the cooler is connected to a water outlet ball valve.

[0012] Preferably, the first main pump motor group system includes a first oil suction ball valve connected to the main oil tank, the first oil suction ball valve is connected to the first pump group through a second flexible joint, the oil outlet of the first pump group is connected to the first high-pressure filter, and the first high-pressure filter is connected to the first test system through the second one-way valve and the first outlet ball valve in turn; a first seismic-resistant pressure gauge and a first electromagnetic overflow valve are installed on the pipeline between the first high-pressure filter and the second one-way valve; a first proportional overflow valve, a first pressure sensor and a connecting ball valve are installed on the pipeline between the second one-way valve and the first outlet ball valve, and the other end of the connecting ball valve is connected to the second test system.

[0013] Preferably, the second main pump motor group system includes a second oil suction ball valve connected to the main oil tank, the second oil suction ball valve is connected to the second pump group through a third flexible joint, the oil outlet of the second pump group is connected to the second high-pressure filter, and the second high-pressure filter is connected to the second test system through a third one-way valve and a second outlet ball valve in turn; a second seismic-resistant pressure gauge and a second electromagnetic overflow valve are installed on the pipeline between the second high-pressure filter and the third one-way valve; the pipeline between the third one-way valve and the second outlet ball valve is connected to the connecting ball valve and is installed with a second pressure sensor.

[0014] Preferably, the control pump motor group system includes a third oil suction ball valve connected to the main oil tank, the third oil suction ball valve is connected to the third pump group through a fourth flexible joint, the oil outlet of the third pump group is connected to the third high-pressure filter, and the third high-pressure filter is connected to the third test system through a fourth one-way valve and a third outlet ball valve in turn; a third seismic-resistant pressure gauge and a third electromagnetic overflow valve are installed on the pipeline between the third pump group and the third high-pressure filter; a second proportional overflow valve and a third pressure sensor are installed on the pipeline between the fourth one-way valve and the third outlet ball valve.

[0015] Preferably, the first pump group adopts a constant pressure variable displacement plunger pump and is connected to a first drive motor to provide pumping oil power;

[0016] The second pump group adopts a constant pressure variable displacement plunger pump and is connected to a second drive motor to provide pumping oil power;

[0017] The third pump group adopts a constant pressure variable displacement pump and is connected to a third drive motor to provide oil pumping power.

[0018] Preferably, the control valve test bench system is arranged in a valve test laboratory, and the valve test laboratory is connected to the valve platform pump station room through a hydraulic pipeline;

[0019] The control valve test bench system includes a second ball valve connected to the first test system port, and the pipeline after the second ball valve is connected to the P oil port of the valve to be tested through a seventh ball valve;

[0020] It also includes a third ball valve connected to the second test system port, and the pipeline after the third ball valve is connected to the P oil port of the valve to be tested through a seventh ball valve;

[0021] Also included is a fourth ball valve connected to the third test system port, the fourth ball valve being connected to the X oil port of the valve to be tested through a pressure reducing valve and a sixth ball valve;

[0022] The pipeline between the third ball valve and the seventh ball valve is connected to a bypass flow control assembly and a seventeenth ball valve. The pipeline after the seventeenth ball valve is connected to the B oil port of the valve to be tested through the second flow meter, the fifteenth ball valve, and the eleventh ball valve in sequence. The B oil port of the valve to be tested is connected to a cavity of the dynamic measuring cylinder through the eighth ball valve.

[0023] The oil port A of the valve to be tested is connected to the 13th, 12th, and 9th ball valves simultaneously; the 13th ball valve is connected to the oil port B of the valve to be tested via the throttling loading assembly and the 20th ball valve; the 12th ball valve is connected to the oil return line via the 16th ball valve, the first flow meter, and the 18th ball valve in sequence; the 9th ball valve is connected to the other chamber of the dynamic measuring cylinder;

[0024] The T oil port of the valve to be tested is connected to both the 21st and 14th ball valves, with the 21st ball valve connected to the oil return line; the 14th ball valve is connected to the Y oil port of the valve to be tested through the 10th ball valve, and is connected to the main oil tank of the control pump-motor system through the 5th ball valve;

[0025] The pipeline after the fourth ball valve is connected to the first accumulator through the first safety shut-off valve group, and the first safety shut-off valve group is also connected to the oil return pipeline;

[0026] The T oil port of the valve to be tested is connected to the second accumulator through the twenty-third ball valve and the second safety shut-off valve group, and the second safety shut-off valve group is connected to the P oil port of the valve to be tested through the twenty-second ball valve.

[0027] Preferably, the bypass flow regulating assembly includes a third proportional throttle valve and an electromagnetic reversing valve connected in parallel, and the other ports of the third proportional throttle valve and the electromagnetic reversing valve are connected to the oil return pipeline.

[0028] Preferably, the throttle loading assembly includes a first proportional throttle valve, a second proportional throttle valve, a first electromagnetic reversing valve and a nineteenth ball valve connected in parallel.

[0029] On the other hand, the present invention provides a method for performing a performance test on a valve to be tested using the hydraulic directional valve test system, including testing of electromagnetic reversing valves and electromagnetic ball valves:

[0030] Internal leakage test, the oil flows from the P port to the T port of the valve to be tested:

[0031] Step 1.1, open the second ball valve, the seventh ball valve, the fourteenth ball valve, the fifteenth ball valve, and the eighteenth ball valve;

[0032] Step 1.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0033] Step 1.3: Power on or off the test valve to close the oil port from P to T, and detect the internal leakage through the second flow meter;

[0034] Internal leakage test, the oil flows from the P port to the A port of the valve to be tested:

[0035] Step 2.1, open the second ball valve, the seventh ball valve, the twelfth ball valve, the fifteenth ball valve, and the eighteenth ball valve;

[0036] Step 2.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0037] Step 2.3: The test valve is energized or de-energized to close the oil port P to the oil port A, and the internal leakage is detected by the second flow meter;

[0038] Internal leakage test, the oil flows from the P port to the B port of the valve to be tested:

[0039] Step 3.1, open the second ball valve, the seventh ball valve, the eleventh ball valve, the fifteenth ball valve, and the eighteenth ball valve;

[0040] Step 3.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0041] Step 3.3: The test valve is energized or de-energized to close the oil port from P to B, and the internal leakage is detected by the second flow meter.

[0042] Steady-state pressure difference-flow characteristic test:

[0043] Step 4.1, open the second ball valve, the seventh ball valve, the thirteenth ball valve, the twentieth ball valve, the nineteenth ball valve, the fourteenth ball valve, the sixteenth ball valve, and the eighteenth ball valve;

[0044] If it is a three-way valve, open the second ball valve, the seventh ball valve, the thirteenth ball valve, the twentieth ball valve, the eleventh ball valve, the sixteenth ball valve, and the eighteenth ball valve;

[0045] Step 4.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to fully open the valve port for diversion;

[0046] Step 4.3, closing the first proportional throttle valve and the second proportional throttle valve;

[0047] In step 4.4, the valve to be tested is energized or de-energized to connect the valve ports, and a signal is input to the third proportional throttle valve to gradually reduce the diversion flow rate. The flow rate of the valve to be tested is gradually increased from zero. The pressure difference-flow characteristic curve is plotted with the output flow rate as the X-axis and the pressure difference as the Y-axis.

[0048] On the other hand, the present invention provides a method for performing a performance test of a valve to be tested using the hydraulic directional valve test system, including servo valve and proportional valve testing:

[0049] Internal leakage test:

[0050] Step 5.1, open the second ball valve, the seventh ball valve, the fourteenth ball valve, the fifteenth ball valve, and the eighteenth ball valve;

[0051] Step 5.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0052] Step 5.3: Open the connecting ball valve, the fourth ball valve, and the sixth ball valve, start the third pump group, adjust the second proportional relief valve and the pressure reducing valve to set the pilot control oil pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0053] Step 5.4: Input a periodic signal to the valve to be tested, use the second flowmeter to detect the leakage of the T oil port, open the tenth and twenty-first ball valves, close the fifth and fourteenth ball valves, and detect the leakage of the Y oil port using the second flowmeter;

[0054] Output flow-input signal characteristic test under constant valve pressure drop:

[0055] Step 6.1, open the second ball valve, the seventh ball valve, the thirteenth ball valve, the nineteenth ball valve, the twentieth ball valve, the fourteenth ball valve, the sixteenth ball valve, the eighteenth ball valve, and the fifth ball valve;

[0056] Step 6.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0057] Step 6.3: Open the third outlet ball valve, the fourth ball valve, and the sixth ball valve, start the third pump group, adjust the second proportional relief valve and the pressure reducing valve to set the pilot control oil pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0058] Step 6.4, closing the first proportional throttle valve and the second proportional throttle valve;

[0059] Step 6.5: Input a periodic signal to the valve to be tested, and plot its output flow-input signal characteristic curve with the given signal percentage as the X-axis and the flow signal as the Y-axis;

[0060] Threshold characteristic test:

[0061] Step 7.1, open the second ball valve, the seventh ball valve, the thirteenth ball valve, the nineteenth ball valve, the twentieth ball valve, the fourteenth ball valve, the sixteenth ball valve, the eighteenth ball valve, and the fifth ball valve;

[0062] Step 7.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0063] Step 7.3: Open the third outlet ball valve, the fourth ball valve, and the sixth ball valve, start the third pump group, adjust the second proportional relief valve and the pressure reducing valve to set the pilot control oil pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0064] Step 7.4, closing the first proportional throttle valve and the second proportional throttle valve;

[0065] Step 7.5: Input a signal to the valve to be tested so that the output flow is 25% of the rated flow. Then gradually reduce the input signal so that the flow also decreases accordingly. Slowly reduce the input signal to minimize the dynamic impact.

[0066] Step 7.6, record the input signal when the flow rate starts to decrease;

[0067] Step 7.7, calculate the threshold by calculating the signal change increment based on the algebraic difference between the two recorded signal values, and draw a curve with the given signal percentage as the X-axis and the flow signal as the Y-axis;

[0068] Step 7.8: Repeat the test steps from Step 7.4 to Step 7.6 at 75% of the rated flow rate;

[0069] Step 7.9: Input the opposite signal and repeat the test steps from step 7.4 to step 7.7;

[0070] Step 7.10, when testing the zero position of the zero opening and negative cover valves, use this threshold characteristic test method;

[0071] Throttling regulation characteristics test:

[0072] When from oil supply port P to working oil port A:

[0073] Step 8.1.1, open the second ball valve, the seventh ball valve, the twelfth ball valve, the sixteenth ball valve, the eighteenth ball valve, and the fifth ball valve;

[0074] Step 8.1.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0075] Step 8.1.3: Open the third outlet ball valve, the fourth ball valve, and the sixth ball valve, start the third pump group, adjust the second proportional relief valve and the pressure reducing valve to set the pilot control oil pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0076] Step 8.1.4: Slowly increase the input signal from zero to the rated positive value, and draw the flow curve from the oil supply port P to the working oil port A with the given signal as the X-axis and the flow signal as the Y-axis.

[0077] From the working oil port A to the return oil port T:

[0078] Step 8.2.1, open the second ball valve, the seventeenth ball valve, the sixteenth ball valve, the twelfth ball valve, the twenty-first ball valve, and the fifth ball valve;

[0079] Step 8.2.2, open the first outlet ball valve, close the communication ball valve, the second outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure;

[0080] Step 8.2.3, open the third outlet ball valve, the fourth ball valve, the sixth ball valve, start the third pump group, adjust the second proportional relief valve and the pressure reducing valve to set the pilot control oil pressure, adjust the third proportional throttle valve to set the test flow rate;

[0081] Step 8.2.4, slowly increase the input signal from zero to the rated positive value, draw the flow curve from the working oil port A to the oil return port T with the given signal as the X axis and the flow signal as the Y axis;

[0082] From the working oil port B to the oil return port T:

[0083] Step 8.3.1, open the second ball valve, the seventh ball valve, the eleventh ball valve, the sixteenth ball valve, the eighteenth ball valve, the fifth ball valve;

[0084] Step 8.3.2, open the first outlet ball valve, close the communication ball valve, the second outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure;

[0085] Step 8.3.3, open the third outlet ball valve, the fourth ball valve, the sixth ball valve, start the third pump group, adjust the second proportional relief valve and the pressure reducing valve to set the pilot control oil pressure, adjust the third proportional throttle valve to set the test flow rate;

[0086] Step 8.3.4, slowly increase the input signal from zero to the rated positive value, draw the flow curve from the working oil port B to the oil return port T with the given signal as the X axis and the flow signal as the Y axis.

[0087] From the working oil port B to the oil return port T:

[0088] Step 8.4.1, open the second ball valve, the seventeenth ball valve, the sixteenth ball valve, the eleventh ball valve, the twenty-first ball valve, the fifth ball valve;

[0089] Step 8.4.2, open the first outlet ball valve, close the communication ball valve, the second outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure;

[0090] Step 8.4.3, open the third outlet ball valve, the fourth ball valve, the sixth ball valve, start the third pump group, adjust the second proportional relief valve and the pressure reducing valve to set the pilot control oil pressure, adjust the third proportional throttle valve to set the test flow rate;

[0091] Step 8.4.4, slowly increase the input signal from zero to the rated positive value, draw the flow curve from the working oil port B to the oil return port T with the given signal as the X axis and the flow signal as the Y axis.

[0092] The present invention has the following beneficial effects:

[0093] 1. The test system of the present invention can test different functions of different valves, including internal leakage test and steady-state pressure difference-flow characteristic test of electromagnetic reversing valves and electromagnetic ball valves; internal leakage test, output flow-input signal characteristic test, threshold characteristic test, throttling adjustment characteristic test, output flow-load pressure difference characteristic test, output flow-valve pressure drop characteristic test, limit power characteristic test, pressure zero drift, fault protection function test, dynamic test and other parameters of servo valves and proportional valves. Different valves can be tested on a single test platform, which is helpful to understand whether the performance of old valves and newly purchased valves meet on-site requirements and quality assessment, and greatly assists in the maintenance and repair of hydraulic equipment.

[0094] 2. The above-mentioned oil tank system can be used to provide hydraulic oil during the test process.

[0095] 3. The cooling circulation device can be used to circulate and cool the hydraulic oil during the test, thereby ensuring the performance of the hydraulic oil.

[0096] 4. The above-mentioned cooler can ensure the best cooling effect.

[0097] 5. The first main pump-motor system can be used to provide the required hydraulic power during the test.

[0098] 6. Through the above system, when the oil supply flow of the first main pump-motor group system does not meet the oil demand of the first test system, the second outlet ball valve of the second main pump-motor group system can be closed, and the connecting ball valve 61.2 can be opened to start the first main pump-motor group system and the second main pump-motor group system respectively to supply oil to the first test system. Similarly, when the oil supply flow of the second main pump-motor group system does not meet the oil demand of the second test system, the first outlet ball valve of the first pump group can be closed, and the connecting ball valve 61.2 can be opened to start the first main pump-motor group system and the second main pump-motor group system respectively to supply oil to system P2.

[0099] 7. Using the above system, if the first main pump-motor system fails, the second outlet ball valve of the second main pump-motor system can be closed, the connecting ball valve can be opened, and the second main pump-motor system can be started to supply oil to the first test system. Similarly, if the second main pump-motor system fails, the first outlet ball valve of the first main pump-motor system can be closed, the connecting ball valve can be opened, and the first main pump-motor system can be started to supply oil to the second test system. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] The present invention will be further described below with reference to the accompanying drawings and examples.

[0101] Figure 1 This is the hydraulic pump station system of the present invention.

[0102] Figure 2 Control valve test bench system of the present application.

[0103] In the figure: first test system P1, second test system P2, third test system P3;

[0104] Main oil tank 43, oil drain ball valve 42, heater 28, liquid level sensor 25, visual liquid level gauge 23, temperature sensor 27, oil return filter 92, oil filling filter 30, oil sampling ball valve 91;

[0105] Ball valve with switch signaling valve 90, first flexible joint 89, cooling pump motor set 07.2, first check valve 66, cooler 29, first ball valve 96, filter 32;

[0106] Water inlet ball valve 71.1, electromagnetic water valve 72, water outlet ball valve 71.2;

[0107] First oil suction ball valve 21.1, second flexible joint 19.1, first pump set 01.1, first high-pressure filter 33.1, second check valve 69.1, first outlet ball valve 61.1, first test system P1, first shock-resistant pressure gauge 47.1, first electromagnetic overflow valve 87.1, first proportional overflow valve 75, first pressure sensor 50.1, communication ball valve 61.2, second test system P2;

[0108] Second oil suction ball valve 21.2, third flexible joint 19.2, second pump set 01.2, second high-pressure filter 33.2, third check valve 69.2, second outlet ball valve 61.3, second shock-resistant pressure gauge 47.2, second electromagnetic overflow valve 87.2, second pressure sensor 50.2;

[0109] Third oil suction ball valve 22.1, fourth flexible joint 20.1, third pump set 02, third high-pressure filter 34, fourth check valve 70.1, third outlet ball valve 62.1, third shock-resistant pressure gauge 47.3, third electromagnetic overflow valve 87.3, second proportional overflow valve 76, third pressure sensor 50.3;

[0110] First accumulator 37, second accumulator 38, first safety shut-off valve set 39, second safety shut-off valve set 40;

[0111] Second ball valve 60.9, third ball valve 60.10, fourth ball valve 63.1, fifth ball valve 59.1, sixth ball valve 63.4, seventh ball valve 60.11, eighth ball valve 53, ninth ball valve 54, tenth ball valve 59.2, eleventh ball valve 60.7, twelfth ball valve 60.6, thirteenth ball valve 60.4, fourteenth ball valve 41.2, fifteenth ball valve 59.3, sixteenth ball valve 60.8, seventeenth ball valve 60.2, eighteenth ball valve 60.3, nineteenth ball valve 60.1, twentieth ball valve 60.5, twenty-first ball valve 41.1, twenty-second ball valve 51, twenty-third ball valve 52;

[0112] A first flow meter 73, a second flow meter 74, and a pressure reducing valve 77;

[0113] First proportional throttle valve 78.1, second proportional throttle valve 78.2, third proportional throttle valve 78.3;

[0114] The first electromagnetic reversing valve 79.1 and the second electromagnetic reversing valve 79.2. DETAILED DESCRIPTION

[0115] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0116] Example 1:

[0117] like Figure 1-2As shown, a hydraulic directional valve test system includes a hydraulic pump station system for providing hydraulic power during the test process; the hydraulic pump station system includes an oil tank system, and a first main pump motor group system and a second main pump motor group system are connected in parallel to the oil tank system, the first main pump motor group system is used to provide hydraulic power for the first test system P1, and the second main pump motor group system is used to provide hydraulic power for the second test system P2; the oil tank system is connected to a control pump motor group system, and the control pump motor group system is used to provide hydraulic power for the third test system P3; the first test system P1, the second test system P2 and the third test system P3 are connected to a control valve test bench system for testing the valve to be tested. By adopting the above-mentioned hydraulic directional valve test system, different functions of different valves can be tested, including internal leakage test and steady-state pressure difference-flow characteristic test of solenoid reversing valves and solenoid ball valves; internal leakage test, output flow-input signal characteristic test, threshold characteristic test, throttling adjustment characteristic test, output flow-load pressure difference characteristic test, output flow-valve pressure drop characteristic test, limit power characteristic test, pressure zero drift, fault protection function test, dynamic test and other parameters of servo valves and proportional valves. Different valves can be tested on each test platform, which is helpful to understand whether the performance of old valves and newly purchased valves meet on-site requirements and quality assessment, and greatly assists the maintenance and repair of hydraulic equipment.

[0118] Furthermore, the entire hydraulic pump station system is located inside the valve station pump station room. The oil tank system includes a main oil tank 43, which is equipped with multiple oil drain ball valves 42. Multiple sets of heaters 28 are installed inside the main oil tank 43. The main oil tank 43 is also equipped with a liquid level sensor 25, a visual level gauge 23, a temperature sensor 27, a return oil filter 92, an oil injection filter 30, and an oil sampling ball valve 91. The above-mentioned oil tank system can be used to provide hydraulic oil during the test process.

[0119] Furthermore, the main oil tank 43 is connected to a cooling circulation device for cooling the hydraulic fluid. This cooling circulation device includes a ball valve 90 with a switch signaling function connected to the main oil tank 43. This ball valve 90 is connected to the cooling pump motor unit 07.2 via a first flexible joint 89. The outlet of the cooling pump motor unit 07.2 is connected to the cooler 29 via a first check valve 66. The outlet of the cooler 29 is connected in parallel to a first ball valve 96, which is then connected to the main oil tank 43 via a filter 32. This cooling circulation device can be used to circulate and cool the hydraulic fluid during testing, thereby ensuring the hydraulic fluid's performance. Specifically, the cooling circulation device operates as follows: When the cooling pump motor unit 07.2 is activated, the fluid enters the cooler through the ball valve 90 with a switch signaling function, the first flexible joint 89, and the first check valve 66. The inlet ball valve 71.1 connects to the cooling water inlet, and the outlet ball valve 71.2 connects to the cooling water outlet. The oil and cooling water complete heat exchange in the cooler, and finally, the oil flows back to the oil tank through the first ball valve 96 and the filter 32.

[0120] Furthermore, the cooler 29 is a plate-type cooler, connected to a water inlet ball valve 71.1 for cooling water to enter, a solenoid water valve 72 installed on the pipeline after the water inlet ball valve 71.1, and a water outlet ball valve 71.2 connected to the cooling water outlet of the cooler 29. The above-mentioned cooler 29 can ensure an optimal cooling effect.

[0121] Furthermore, the first main pump-motor system includes a first oil suction ball valve 21.1 connected to the main oil tank 43. The first oil suction ball valve 21.1 is connected to the first pump unit 01.1 via a second flexible joint 19.1. The oil outlet of the first pump unit 01.1 is connected to the first high-pressure filter 33.1. The first high-pressure filter 33.1 is connected to the first test system P1 via a second one-way valve 69.1 and a first outlet ball valve 61.1. A first shock-resistant pressure gauge 47.1 and a first electromagnetic relief valve 87.1 are installed on the pipeline between the first high-pressure filter 33.1 and the second one-way valve 69.1. A first proportional relief valve 75, a first pressure sensor 50.1, and a connecting ball valve 61.2 are installed on the pipeline between the second one-way valve 69.1 and the first outlet ball valve 61.1. The other end of the connecting ball valve 61.2 is connected to the second test system P2. The above-mentioned first main pump-motor system can be used to provide the required hydraulic power during the test process.

[0122] Further, the second main pump motor group system comprises a second oil suction ball valve 21.2 connected to the main oil tank 43, the second oil suction ball valve 21.2 is connected to the second pump group 01.2 through a third flexible joint 19.2, the oil outlet of the second pump group 01.2 is connected to a second high-pressure filter 33.2, the second high-pressure filter 33.2 is connected to a second test system P2 in sequence through a third one-way valve 69.2 and a second outlet ball valve 61.3; a second shock resistance pressure gauge 47.2 and a second electromagnetic overflow valve 87.2 are installed on the pipeline between the second high-pressure filter 33.2 and the third one-way valve 69.2; a second pressure sensor 50.2 is installed on the pipeline between the third one-way valve 69.2 and the second outlet ball valve 61.3, and a communication ball valve 61.2 is connected in communication. The second main pump motor group system can be used to provide the required hydraulic power during the test, and can be used as a backup for the first main pump motor group system.

[0123] The first main pump motor group system and the second main pump motor group system have the same operation principle. Taking the control principle of the first main pump motor group system as an example: start the pump motor group, the pressure oil enters the first pump group 01.1 through the first oil suction ball valve 21.1 and the second flexible joint 19.1, and the oil pump pressure oil supplies oil to the system through the first high-pressure filter 33.1, the second one-way valve 69.1, and the first outlet ball valve 61.1. The first electromagnetic overflow valve 87.1 is a safety pressure for the oil pump, which ensures that the oil pump will not run overload; the first high-pressure filter 33.1 mainly ensures the cleanliness of the oil during system operation, prevents impurities from entering the system circuit, and causes valve sticking and other phenomena; the first proportional overflow valve 75 adjusts the system pressure steplessly through the electric control system; the first shock resistance pressure gauge 47.1 displays the system pressure; the first pressure sensor 50.1 and the second pressure sensor 50.2 monitor the pressure of the first main pump motor group system and the second main pump motor group system in real time.

[0124] When the oil supply flow of the first main pump motor group system does not meet the oil requirement of the first test system P1, the second outlet ball valve 61.3 of the second main pump motor group system can be closed, the communication ball valve 61.2 is opened, and the first main pump motor group system and the second main pump motor group system are started respectively to supply oil to the first test system P1. Similarly, when the oil supply flow of the second main pump motor group system does not meet the oil requirement of the second test system P2, the first outlet ball valve 61.1 of the first pump group 01.1 can be closed, the communication ball valve 61.2 is opened, and the first main pump motor group system and the second main pump motor group system are started respectively to supply oil to the system P2.

[0125] If the first main pump-motor system fails, the second outlet ball valve 61.3 of the second main pump-motor system can be closed, the connecting ball valve 61.2 can be opened, and the second main pump-motor system can be started to supply oil to the first test system P1. Similarly, if the second main pump-motor system fails, the first outlet ball valve 61.1 of the first main pump-motor system can be closed, the connecting ball valve 61.2 can be opened, and the first main pump-motor system can be started to supply oil to the second test system P2.

[0126] Furthermore, the control pump-motor system includes a third oil suction ball valve 22.1 connected to the main oil tank 43. This third suction ball valve 22.1 is connected to the third pump unit 02 via a fourth flexible joint 20.1. The oil outlet of the third pump unit 02 is connected to the third high-pressure filter 34, which is then connected to the third test system P3 via a fourth check valve 70.1 and a third outlet ball valve 62.1. A third seismic-resistant pressure gauge 47.3 and a third electromagnetic relief valve 87.3 are installed in the pipeline between the third pump unit 02 and the third high-pressure filter 34. A second proportional relief valve 76 and a third pressure sensor 50.3 are installed in the pipeline between the fourth check valve 70.1 and the third outlet ball valve 62.1. The control principle of the control pump-motor system is consistent with the control principle of the first main pump-motor system.

[0127] Furthermore, the first pump group 01.1 adopts a constant pressure variable displacement plunger pump and is connected to the first drive motor 06.1 to provide oil pumping power; thereby facilitating the realization of different oil supply flow rates and pressures.

[0128] Furthermore, the second pump group 01.2 adopts a constant pressure variable displacement plunger pump and is connected to the second drive motor 06.2 to provide oil pumping power; thereby facilitating the realization of different oil supply flow rates and pressures.

[0129] Furthermore, the third pump group 02 uses a constant pressure variable displacement pump and is connected to the third drive motor 07.1 to provide oil pumping power.

[0130] Furthermore, the control valve test bench system is arranged in a valve test laboratory, and the valve test laboratory is connected to the valve platform pump station room through a hydraulic pipeline;

[0131] The control valve test bench system includes a second ball valve 60.9 connected to the P1 port of the first test system. The pipeline after the second ball valve 60.9 is connected to the P oil port of the valve to be tested through the seventh ball valve 60.11.

[0132] It also includes a third ball valve 60.10 connected to the P2 port of the second test system, and the pipeline after the third ball valve 60.10 is connected to the P oil port of the valve to be tested through a seventh ball valve 60.11;

[0133] It also includes a fourth ball valve 63.1 connected to the P3 port of the third test system, and the fourth ball valve 63.1 is connected to the X oil port of the valve to be tested through a pressure reducing valve 77 and a sixth ball valve 63.4;

[0134] The pipeline between the third ball valve 60.10 and the seventh ball valve 60.11 is connected to a bypass flow control assembly and a seventeenth ball valve 60.2. The pipeline after the seventeenth ball valve 60.2 is connected to the oil port B of the valve to be tested through the second flow meter 74, the fifteenth ball valve 59.3, and the eleventh ball valve 60.7. The oil port B of the valve to be tested is connected to one cavity of the dynamic measurement cylinder 80 through the eighth ball valve 53.

[0135] The oil port A of the valve to be tested is simultaneously connected to the thirteenth ball valve 60.4, the twelfth ball valve 60.6, and the ninth ball valve 54. The thirteenth ball valve 60.4 is connected to the oil port B of the valve to be tested via the throttling loading assembly and the twentieth ball valve 60.5. The twelfth ball valve 60.6 is connected to the oil return line via the sixteenth ball valve 60.8, the first flowmeter 73, and the eighteenth ball valve 60.3. The ninth ball valve 54 is connected to the other chamber of the dynamic measuring cylinder 80.

[0136] The T port of the valve to be tested is connected to both the 21st ball valve 41.1 and the 14th ball valve 41.2. The 21st ball valve 41.1 is connected to the oil return line. The 14th ball valve 41.2 is connected to the Y port of the valve to be tested via the 10th ball valve 59.2 and to the main oil tank 43 of the control pump-motor system via the 5th ball valve 59.1.

[0137] The pipeline after the fourth ball valve 63.1 is connected to the first accumulator 37 through the first safety shut-off valve group 39, and the first safety shut-off valve group 39 is also connected to the oil return pipeline;

[0138] The T oil port of the valve to be tested is connected to the second accumulator 38 through the twenty-third ball valve 52 and the second safety shut-off valve group 40 . The second safety shut-off valve group 40 is connected to the P oil port of the valve to be tested through the twenty-second ball valve 51 .

[0139] Furthermore, the bypass flow regulating assembly includes a third proportional throttle valve 78.3 and an electromagnetic reversing valve 79.2 connected in parallel, and the other ports of the third proportional throttle valve 78.3 and the electromagnetic reversing valve 79.2 are connected to the oil return pipeline.

[0140] Furthermore, the throttle loading assembly includes a first proportional throttle valve 78.1, a second proportional throttle valve 78.2, a first electromagnetic reversing valve 79.1 and a nineteenth ball valve 60.1 connected in parallel.

[0141] Furthermore, the control valve test bench operation room is equipped with control valve platform, weak current control box, rocker arm operation box, operating ball valve, display instrument, dynamic measuring cylinder, accumulator, oil collection pump unit, industrial computer and other components.

[0142] Example 2:

[0143] The method for testing the performance of the valve to be tested by using the hydraulic directional valve test system includes testing of the electromagnetic reversing valve and the electromagnetic ball valve:

[0144] Internal leakage test, oil from the P port to the T port of the valve to be tested:

[0145] Step 1.1, open the second ball valve 60.9, the seventh ball valve 60.11, the fourteenth ball valve 41.2, the fifteenth ball valve 59.3, and the eighteenth ball valve 60.3;

[0146] Step 1.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2 and the second outlet ball valve 61.3, start the first pump set 01.1, adjust the first proportional overflow valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0147] Step 1.3, energize or de-energize the valve to be tested to close the P port to the T port, and detect the internal leakage by the second flow meter 74;

[0148] Internal leakage test, oil from the P port to the A port of the valve to be tested:

[0149] Step 2.1, open the second ball valve 60.9, the seventh ball valve 60.11, the twelfth ball valve 60.6, the fifteenth ball valve 59.3, and the eighteenth ball valve 60.3;

[0150] Step 2.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2 and the second outlet ball valve 61.3, start the first pump set 01.1, adjust the first proportional overflow valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0151] Step 2.3, energize or de-energize the valve to be tested to close the P port to the A port, and detect the internal leakage by the second flow meter 74;

[0152] Internal leakage test, oil from the P port to the B port of the valve to be tested:

[0153] Step 3.1, open the second ball valve 60.9, the seventh ball valve 60.11, the eleventh ball valve 60.7, the fifteenth ball valve 59.3, and the eighteenth ball valve 60.3;

[0154] Step 3.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2 and the second outlet ball valve 61.3, start the first pump set 01.1, adjust the first proportional overflow valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0155] Step 3.3, the valve to be tested is energized or de-energized to close the P oil port to the B oil port, and the amount of leakage therein is detected by the second flowmeter 74;

[0156] Steady-state differential pressure-flow characteristic test:

[0157] Step 4.1, the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the twentieth ball valve 60.5, the nineteenth ball valve 60.1, the fourteenth ball valve 41.2, the sixteenth ball valve 60.8, and the eighteenth ball valve 60.3 are opened;

[0158] If it is a three-way valve, the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the twentieth ball valve 60.5, the eleventh ball valve 60.7, the sixteenth ball valve 60.8, and the eighteenth ball valve 60.3 are opened;

[0159] Step 4.2, the first outlet ball valve 61.1 is opened, the communication ball valve 61.2 and the second outlet ball valve 61.3 are closed, the first pump set 01.1 is started, the first proportional overflow valve 75 is adjusted to set the test pressure, and the third proportional throttle valve 78.3 is adjusted to make the valve port fully open and shunt;

[0160] Step 4.3, the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2 are closed;

[0161] Step 4.4, the valve to be tested is energized or de-energized to make the valve port communicate, the input signal to the third proportional throttle valve 78.3 is gradually reduced, the test valve flow is gradually increased from zero, and the differential pressure-flow characteristic curve is drawn with the output flow as the X-axis and the differential pressure as the Y-axis.

[0162] Example 3:

[0163] A method for testing the performance of a hydraulic directional valve using a hydraulic directional valve test system, including a servo valve and a proportional valve test:

[0164] Internal leakage test:

[0165] Step 5.1, the second ball valve 60.9, the seventh ball valve 60.11, the fourteenth ball valve 41.2, the fifteenth ball valve 59.3, and the eighteenth ball valve 60.3 are opened;

[0166] Step 5.2, the first outlet ball valve 61.1 is opened, the communication ball valve 61.2 and the second outlet ball valve 61.3 are closed, the first pump set 01.1 is started, and the first proportional overflow valve 75 is adjusted to set the test pressure;

[0167] Step 5.3, open the communication ball valve 61.2, the fourth ball valve 63.1, the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional overflow valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0168] Step 5.4, input the periodic signal to the valve to be tested, detect the leakage of the T oil port through the second flowmeter 74, open the tenth ball valve 59.2 and the twenty-first ball valve 41.1, close the fifth ball valve 59.1 and the fourteenth ball valve 41.2 to detect the leakage of the Y oil port through the second flowmeter 74;

[0169] Output flow rate-input signal characteristic test under constant valve pressure drop:

[0170] Step 6.1, open the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the nineteenth ball valve 60.1, the twentieth ball valve 60.5, the fourteenth ball valve 41.2, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0171] Step 6.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional overflow valve 75 to set the test pressure;

[0172] Step 6.3, open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional overflow valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0173] Step 6.4, close the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0174] Step 6.5, input the periodic signal to the valve to be tested, and draw the output flow rate-input signal characteristic curve with the given signal percentage as the X-axis and the flow signal as the Y-axis;

[0175] Threshold characteristic test:

[0176] Step 7.1, open the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the nineteenth ball valve 60.1, the twentieth ball valve 60.5, the fourteenth ball valve 41.2, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0177] Step 7.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional overflow valve 75 to set the test pressure;

[0178] Step 7.3, open the third outlet ball valve 62.1, the fourth ball valve 63.1, the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional overflow valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0179] Step 7.4, close the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0180] Step 7.5, input a signal to the valve to be tested to make the output flow rate 25% of the rated flow rate, then gradually reduce the input signal to reduce the flow rate accordingly, and slowly reduce the input signal to minimize the dynamic influence;

[0181] Step 7.6, record the input signal when the flow rate starts to decrease;

[0182] Step 7.7, calculate the threshold value by calculating the signal change increment according to the algebraic difference of the two recorded signal values, and plot a curve with the given signal percentage as the X-axis and the flow rate signal as the Y-axis;

[0183] Step 7.8, repeat the test steps of steps 7.4 to 7.6 at 75% of the rated flow rate;

[0184] Step 7.9, input the opposite signal and repeat the test steps of steps 7.4 to 7.7;

[0185] Step 7.10, use the threshold value characteristic test method when testing the zero position and negative cover valve of the zero opening valve;

[0186] Throttle regulation characteristic test:

[0187] When from the oil supply port P to the working oil port A:

[0188] Step 8.1.1, open the second ball valve 60.9, the seventh ball valve 60.11, the twelfth ball valve 60.6, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0189] Step 8.1.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional overflow valve 75 to set the test pressure;

[0190] Step 8.1.3, open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional overflow valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0191] Step 8.1.4: Slowly increase the input signal from zero to the rated positive value, and draw the flow curve from the oil supply port P to the working oil port A with the given signal as the X-axis and the flow signal as the Y-axis.

[0192] From the working oil port A to the return oil port T:

[0193] Step 8.2.1, open the second ball valve 60.9, the seventeenth ball valve 60.2, the sixteenth ball valve 60.8, the twelfth ball valve 60.6, the twenty-first ball valve 41.1, and the fifth ball valve 59.1;

[0194] Step 8.2.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0195] Step 8.2.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0196] In step 8.2.4, slowly increase the input signal from zero to the rated positive value, and draw a flow curve from the working oil port A to the return oil port T with the given signal as the X-axis and the flow signal as the Y-axis;

[0197] From the oil supply port P to the working oil port B:

[0198] Step 8.3.1, open the second ball valve 60.9, the seventh ball valve 60.11, the eleventh ball valve 60.7, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0199] Step 8.3.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0200] Step 8.3.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0201] Step 8.3.4: Slowly increase the input signal from zero to the rated positive value, and draw the flow curve from the oil supply port P to the working oil port B with the given signal as the X-axis and the flow signal as the Y-axis.

[0202] From the working oil port B to the return oil port T:

[0203] Step 8.4.1, open the second ball valve 60.9, the seventeenth ball valve 60.2, the sixteenth ball valve 60.8, the eleventh ball valve 60.7, the twenty-first ball valve 41.1, and the fifth ball valve 59.1;

[0204] Step 8.4.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0205] Step 8.4.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0206] Step 8.4.4: Slowly increase the input signal from zero to the rated positive value, and draw the flow curve from the working oil port B to the return oil port T with the given signal as the X-axis and the flow signal as the Y-axis.

[0207] Output flow-load pressure difference characteristic test:

[0208] Step 9.1, open the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the twentieth ball valve 60.5, the fourteenth ball valve 41.2, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0209] Step 9.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0210] Step 9.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0211] Step 9.4, open the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0212] Step 9.5: Make the input given signal change between the maximum positive value and the maximum negative value step by step for several cycles;

[0213] In step 9.6, while inputting different constant values ​​(±25%, ±50%, ±75%, and ±100%) to the valve to be tested, simultaneously input signals to the first proportional throttle valve 78.1 to slowly close the valve port. Draw its output flow-load pressure difference characteristic curve with the load pressure difference pA-pB as the X-axis and the output flow as the Y-axis.

[0214] Output flow-valve pressure drop characteristic test:

[0215] Step 10.1, open the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the twentieth ball valve 60.5, the fourteenth ball valve 41.2, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0216] Step 10.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0217] Step 10.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0218] Step 10.4, closing the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0219] Step 10.5: Make the input given signal change between the maximum positive value and the maximum negative value step by step and cycle for several times;

[0220] In step 10.6, while inputting different constant values ​​(±25%, ±50%, ±75%, and ±100%) to the valve under test, simultaneously input signals to the first proportional throttle valve 78.1 to slowly open the valve port. Draw the output flow-valve pressure drop characteristic curve with the pressure drop (pP - pL - pT, where pL = |pA - pB|) as the X-axis and the output flow as the Y-axis.

[0221] Limit power characteristic test:

[0222] Step 11.1, open the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the nineteenth ball valve 60.1, the twentieth ball valve 60.5, the fourteenth ball valve 41.2, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0223] Step 11.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0224] Step 11.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0225] Step 11.4, closing the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0226] Step 11.5: Adjust the input reference signal to 95% of the maximum positive value, and then superimpose a low-frequency small sinusoidal signal ±5%, with a typical frequency of 0.2Hz to 0.4Hz;

[0227] In step 11.6, while inputting different constant values ​​(±25%, ±50%, ±75%, and ±100%) to the valve to be tested, slowly increase the oil supply pressure to the valve simultaneously. Draw the output flow-valve pressure drop characteristic curve with the pressure drop (pP-pL-pT, pL=|pA-pB|) as the X-axis and the output flow as the Y-axis.

[0228] Step 11.7. When the sinusoidal motion stops or the flow rate suddenly decreases, stop increasing the oil supply pressure. Mark this point on the graph. Connect those marked points, that is, the zero slope points on the curve, to obtain the limiting power characteristic curve.

[0229] Pressure gain-input signal characteristic test:

[0230] Step 12.1, open the second ball valve 60.9, the seventh ball valve 60.11, the twenty-first ball valve 41.1, and the fifth ball valve 59.1;

[0231] Step 12.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0232] Step 12.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0233] In step 12.4, input a periodic signal to the valve to be tested, and ensure that the period is set long enough so that the input signal changes slowly. Plot the pressure gain-input signal characteristic with the given signal percentage as the X-axis and the pressures at ports A and B, pA and pB, and the pressure difference, pA-pB, as the Y-axis.

[0234] Pressure zero drift:

[0235] Step 13.1, open the second ball valve 60.9, the seventh ball valve 60.11, the twenty-first ball valve 41.1, and the fifth ball valve 59.1;

[0236] Step 13.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0237] Step 13.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0238] In step 13.4, with the system oil supply pressure at 10 MPa, adjust the input signal so that the pressures at ports A and B are equal, and record the input signal value at this time.

[0239] In step 13.5, set the oil supply pressure to 5 MPa and 20 MPa respectively, adjust the input signal so that the pressures at ports A and B are equal, record the input signal value at this time, and determine the valve pressure zero drift using the recorded given signal value.

[0240] Fault protection function test:

[0241] Step 14.1: Set the oil circuit to a test oil circuit with flow characteristics or pressure characteristics as needed;

[0242] Step 14.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0243] Step 14.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0244] Step 14.4: simulate various fault conditions and determine the fault protection function of the valve to be tested by detecting the valve core displacement signal.

[0245] Example 4:

[0246] This embodiment provides a dynamic test, which specifically includes:

[0247] Frequency characteristics:

[0248] Servo valves and proportional directional valves with electrical feedback:

[0249] Step 15.1.1, open the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the nineteenth ball valve 60.1, the twentieth ball valve 60.5, the fourteenth ball valve 41.2, the sixteenth ball valve 60.8, the eighteenth ball valve 60.3, the fifth ball valve 59.1;

[0250] Step 15.1.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2, the second outlet ball valve 61.3, start the first pump group 01.1, adjust the first proportional overflow valve 75 to set the test pressure;

[0251] Step 15.1.3, open the third outlet ball valve 62.1, the fourth ball valve 63.1, the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional overflow valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, adjust the third proportional throttle valve 78.3 to set the test flow;

[0252] Step 15.1.4, close the first proportional throttle valve 78.1, the second proportional throttle valve 78.2;

[0253] Step 15.1.5, open the first safety cut-off valve group 39 of the first accumulator 37;

[0254] Step 15.1.6, input the sweep signal to the valve to be tested within the rated signal range, draw the Bode diagram through the displacement feedback signal of the valve to be tested, and thus measure the frequency characteristic thereof;

[0255] Servo valve without electric feedback, i.e. mechanical feedback:

[0256] Step 15.2.1, open the second ball valve 60.9, the seventh ball valve 60.11, the twenty-first ball valve 41.1, the twenty-second ball valve 51, the twenty-third ball valve 52, the eighth ball valve 53, the ninth ball valve 54;

[0257] Step 15.2.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2, the second outlet ball valve 61.3, start the first pump group 01.1, adjust the first proportional overflow valve 75 to set the test pressure;

[0258] Step 15.2.3, open the third outlet ball valve 62.1, the fourth ball valve 63.1, the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional overflow valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, adjust the third proportional throttle valve 78.3 to set the test flow;

[0259] Step 15.2.4, open the first safety cut-off valve group 39 and the second safety cut-off valve group 40 of the first accumulator 37 and the second accumulator 38;

[0260] In step 15.2.5, within the rated signal range, input a frequency sweep signal to the valve to be tested. Draw a Bode plot using the displacement feedback signal of the servo cylinder to measure its frequency characteristics.

[0261] Note: Before introducing pilot control oil into the external control oil port of the servo valve or proportional valve, you must first confirm that the pressure of the pilot control oil matches the control pressure of the valve.

[0262] Step characteristics:

[0263] Servo valves and proportional directional valves with electrical feedback:

[0264] Step 16.1.1, open the second ball valve 60.9, the seventh ball valve 60.11, the thirteenth ball valve 60.4, the nineteenth ball valve 60.1, the twentieth ball valve 60.5, the twenty-first ball valve 41.1, the eighteenth ball valve 60.3, and the fifth ball valve 59.1;

[0265] Step 16.1.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0266] Step 16.1.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0267] Step 16.1.4, close the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0268] Step 16.1.5, open the first safety shut-off valve assembly 39 of the first accumulator 37;

[0269] Step 16.1.6, Input Signal Step Response: Within the rated signal range, input a step signal to the valve under test. Draw a step response characteristic curve based on the displacement feedback signal of the valve under test, thereby detecting the input signal step response characteristic of the valve under test.

[0270] Step 16.1.7, Load Pressure Step Response: First, close first solenoid reversing valve 79.1, input a constant value signal to the valve under test, adjust first proportional throttle valve 78.1, and read the steady-state set flow rate qvs and the pressure differential ΔP2 caused by the flow through first proportional throttle valve 78.1. Open first solenoid reversing valve 79.1, adjust second proportional throttle valve 78.2, read qvs, and the pressure differential ΔP1 caused by the parallel oil circuit of first and second proportional throttle valves 78.1 and 78.2. Quickly close first solenoid reversing valve 79.1 to create a pressure step. Record the flow rate response to a step change from zero load pressure to 50% to 90% of the specified maximum load pressure, and plot a step response characteristic curve to detect the load pressure step response characteristics of the valve under test.

[0271] Servo valve without electrical feedback, i.e. mechanical feedback:

[0272] Step 16.2.1, open the second ball valve 60.9, the seventh ball valve 60.11, the twenty-first ball valve 41.1, the twenty-second ball valve 51, the twenty-third ball valve 52, the eighth ball valve 53, and the ninth ball valve 54;

[0273] Step 16.2.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0274] Step 16.2.3: Open the third outlet ball valve 62.1, the fourth ball valve 63.1, and the sixth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 and the pressure reducing valve 77 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0275] Step 16.2.4, opening the first safety shut-off valve group 39 and the second safety shut-off valve group 40 of the first accumulator 37 and the second accumulator 38;

[0276] Step 16.2.5, input signal step response: Within the rated signal range, input a step signal to the valve to be tested, and draw a step response characteristic curve using the displacement feedback signal of the servo cylinder to detect the input signal step response characteristics of the valve to be tested.

[0277] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic directional valve test system, characterized in that: Includes a hydraulic pump station system for providing hydraulic power during the test; The hydraulic pump station system includes an oil tank system, to which a first main pump-motor system and a second main pump-motor system are connected in parallel. The first main pump-motor system is used to provide hydraulic power for the first test system P1, and the second main pump-motor system is used to provide hydraulic power for the second test system P2. The oil tank system is connected to a control pump-motor system, which is used to provide hydraulic power for the third test system P3. The first test system P1, the second test system P2 and the third test system P3 are connected to a control valve test bench system for testing the valve to be tested; The control valve test bench system is arranged in a valve test laboratory, which is connected to the valve platform pump station room through a hydraulic pipeline; The control valve test bench system includes a second ball valve (60.9) connected to the P1 port of the first test system, and the pipeline after the second ball valve (60.9) is connected to the P oil port of the valve to be tested through the seventh ball valve (60.11); It also includes a third ball valve (60.10) connected to the P2 port of the second test system, and the pipeline after the third ball valve (60.10) is connected to the P oil port of the valve to be tested through a seventh ball valve (60.11); It also includes a fourth ball valve (63.1) connected to the P3 port of the third test system, and the fourth ball valve (63.1) is connected to the X oil port of the valve to be tested through the pressure reducing valve (77) and the sixth ball valve (63.4); The pipeline between the third ball valve (60.10) and the seventh ball valve (60.11) is connected to the inlet of the bypass flow regulating assembly and the inlet of the seventeenth ball valve (60.2), the outlet of the bypass flow regulating assembly is connected to the oil return pipeline, the pipeline after the seventeenth ball valve (60.2) is connected to the B oil port of the valve to be tested through the second flow meter (74), the fifteenth ball valve (59.3) and the eleventh ball valve (60.7) in sequence, and the B oil port of the valve to be tested is connected to a cavity of the dynamic measuring cylinder (80) through the eighth ball valve (53); The oil port A of the valve to be tested is simultaneously connected to the thirteenth ball valve (60.4), the twelfth ball valve (60.6) and the ninth ball valve (54); the thirteenth ball valve (60.4) is connected to the oil port B of the valve to be tested through the throttling loading assembly and the twentieth ball valve (60.5); the twelfth ball valve (60.6) is connected to the return oil pipeline through the sixteenth ball valve (60.8), the first flow meter (73) and the eighteenth ball valve (60.3); the ninth ball valve (54) is connected to the other cavity of the dynamic measuring cylinder (80); The T oil port of the valve to be tested is connected to the 21st ball valve (41.1) and the 14th ball valve (41.2) at the same time. The 21st ball valve (41.1) is connected to the oil return line. The 14th ball valve (41.2) is connected to the Y oil port of the valve to be tested through the 10th ball valve (59.2) and is connected to the main oil tank (43) of the control pump motor system through the 5th ball valve (59.1). The pipeline after the fourth ball valve (63.1) is connected to the first accumulator (37) through the first safety stop valve group (39), and the first safety stop valve group (39) is also connected to the oil return pipeline; The T oil port of the valve to be tested is connected to the second accumulator (38) through the twenty-third ball valve (52) and the second safety shut-off valve group (40), and the second safety shut-off valve group (40) is connected to the P oil port of the valve to be tested through the twenty-second ball valve (51); The throttling loading assembly comprises a first proportional throttle valve (78.1), a second proportional throttle valve (78.2), a first electromagnetic reversing valve (79.1), and a nineteenth ball valve (60.1) connected in parallel.

2. A hydraulic directional valve test system according to claim 1, characterized in that: The entire hydraulic pump station system is set up inside the valve station pump station room; The oil tank system comprises a main oil tank (43), a plurality of oil drain ball valves (42) are provided on the main oil tank (43), a plurality of heaters (28) are provided inside the main oil tank (43), and a liquid level sensor (25), a visual liquid level gauge (23), a temperature sensor (27), an oil return filter (92), an oil filling filter (30) and an oil sampling ball valve (91) are also installed on the main oil tank (43).

3. A hydraulic directional valve test system according to claim 2, characterized in that: The main oil tank (43) is connected to a cooling circulation device for cooling the oil. The cooling circulation device includes a switch-transmitting ball valve (90) connected to the main oil tank (43). The switch-transmitting ball valve (90) is connected to the cooling pump motor unit (07.2) through a first flexible joint (89). The outlet of the cooling pump motor unit (07.2) is connected to the cooler (29) through a first one-way valve (66). The outlet of the cooler (29) is connected in parallel with a first ball valve (96). The first ball valve (96) is connected to the main oil tank (43) through a filter (32).

4. A hydraulic directional valve test system according to claim 3, characterized in that: The cooler (29) is a plate-type cooler. A water inlet ball valve (71.1) for cooling water is connected to the cooler (29). An electromagnetic water valve (72) is installed on the pipeline after the water inlet ball valve (71.1). The cooling water outlet of the cooler (29) is connected to a water outlet ball valve (71.2).

5. A hydraulic directional valve test system according to claim 4, characterized in that: The first main pump motor group system includes a first oil suction ball valve (21.1) connected to the main oil tank (43), the first oil suction ball valve (21.1) is connected to the first pump group (01.1) through a second flexible joint (19.1), the oil outlet of the first pump group (01.1) is connected to the first high-pressure filter (33.1), and the first high-pressure filter (33.1) is connected to the first test system P1 through a second one-way valve (69.1) and a first outlet ball valve (61.1) in sequence; a first shock-resistant pressure gauge (47.1) and a first electromagnetic overflow valve (87.1) are installed on the pipeline between the first high-pressure filter (33.1) and the second one-way valve (69.1); a first proportional overflow valve (75), a first pressure sensor (50.1) and a connecting ball valve (61.2) are installed on the pipeline between the second one-way valve (69.1) and the first outlet ball valve (61.1), and the other end of the connecting ball valve (61.2) is connected to the second test system P2.

6. A hydraulic directional valve test system according to claim 5, characterized in that: The second main pump motor group system includes a second oil suction ball valve (21.2) connected to the main oil tank (43), the second oil suction ball valve (21.2) is connected to the second pump group (01.2) through a third flexible joint (19.2), the oil outlet of the second pump group (01.2) is connected to the second high-pressure filter (33.2), and the second high-pressure filter (33.2) is connected to the second test system P2 through a third one-way valve (69.2) and a second outlet ball valve (61.3) in sequence; a second shock-resistant pressure gauge (47.2) and a second electromagnetic overflow valve (87.2) are installed on the pipeline between the second high-pressure filter (33.2) and the third one-way valve (69.2); the pipeline between the third one-way valve (69.2) and the second outlet ball valve (61.3) is connected to the connecting ball valve (61.2) and is installed with a second pressure sensor (50.2).

7. A hydraulic directional valve test system according to claim 6, characterized in that: The control pump motor group system includes a third oil suction ball valve (22.1) connected to the main oil tank (43), the third oil suction ball valve (22.1) is connected to the third pump group (02) through a fourth flexible joint (20.1), the oil outlet of the third pump group (02) is connected to the third high-pressure filter (34), and the third high-pressure filter (34) is connected to the third test system P3 through a fourth one-way valve (70.1) and a third outlet ball valve (62.1) in sequence; a third shock-resistant pressure gauge (47.3) and a third electromagnetic overflow valve (87.3) are installed on the pipeline between the third pump group (02) and the third high-pressure filter (34); and a second proportional overflow valve (76) and a third pressure sensor (50.3) are installed on the pipeline between the fourth one-way valve (70.1) and the third outlet ball valve (62.1).

8. A hydraulic directional valve test system according to claim 7, characterized in that: The first pump group (01.1) adopts a constant pressure variable displacement plunger pump and is connected to a first drive motor (06.1) to provide pumping oil power; The second pump group (01.2) adopts a constant pressure variable displacement plunger pump and is connected to a second drive motor (06.2) to provide pumping oil power; The third pump group (02) uses a constant pressure variable displacement pump and is connected to a third drive motor (07.1) to provide pumping oil power.

9. A hydraulic directional valve test system according to claim 8, characterized in that: The bypass flow regulating assembly comprises a third proportional throttle valve (78.3) and an electromagnetic reversing valve (79.2) connected in parallel, and the other ends of the third proportional throttle valve (78.3) and the electromagnetic reversing valve (79.2) are connected to the oil return pipeline.

10. A method for performing a performance test on a valve to be tested using the hydraulic directional valve test system according to claim 9, characterized in that: Including the test of solenoid reversing valve: Internal leakage test, the oil flows from the P port to the T port of the valve to be tested: Step 1.1, open the second ball valve (60.9), the seventh ball valve (60.11), the fourteenth ball valve (41.2), the fifteenth ball valve (59.3) and the eighteenth ball valve (60.3); Step 1.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 1.3, the test valve is powered on or off to close the oil port from the P port to the T port, and the internal leakage is detected by the second flow meter (74); Internal leakage test, the oil flows from the P port to the A port of the valve to be tested: Step 2.1, open the second ball valve (60.9), the seventh ball valve (60.11), the twelfth ball valve (60.6), the fifteenth ball valve (59.3), and the eighteenth ball valve (60.3); Step 2.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 2.3, the test valve is powered on or off to close the oil port P to the oil port A, and the internal leakage is detected by the second flow meter (74); Internal leakage test, the oil flows from the P port to the B port of the valve to be tested: Step 3.1, open the second ball valve (60.9), the seventh ball valve (60.11), the eleventh ball valve (60.7), the fifteenth ball valve (59.3), and the eighteenth ball valve (60.3); Step 3.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 3.3, the test valve is powered on or off to close the oil port P to the oil port B, and the internal leakage is detected by the second flow meter (74); Steady-state pressure difference-flow characteristic test: Step 4.1, open the second ball valve (60.9), the seventh ball valve (60.11), the thirteenth ball valve (60.4), the twentieth ball valve (60.5), the nineteenth ball valve (60.1), the fourteenth ball valve (41.2), the sixteenth ball valve (60.8), and the eighteenth ball valve (60.3); If it is a three-way valve, open the second ball valve (60.9), the seventh ball valve (60.11), the thirteenth ball valve (60.4), the twentieth ball valve (60.5), the eleventh ball valve (60.7), the sixteenth ball valve (60.8), and the eighteenth ball valve (60.3); Step 4.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to fully open the valve port for diversion; Step 4.3, close the first proportional throttle valve (78.1) and the second proportional throttle valve (78.2); Step 4.4: The valve to be tested is energized or de-energized to connect the valve ports. A signal is input to the third proportional throttle valve (78.3) to gradually reduce the diverted flow rate. The flow rate of the valve to be tested is gradually increased from zero. The pressure difference-flow characteristic curve is plotted with the output flow rate as the X-axis and the pressure difference as the Y-axis.

11. A method for performing a performance test on a valve to be tested using the hydraulic directional valve test system according to claim 9, characterized in that: Including servo valve and proportional valve tests: Internal leakage test: Step 5.1, open the second ball valve (60.9), the seventh ball valve (60.11), the fourteenth ball valve (41.2), the fifteenth ball valve (59.3), and the eighteenth ball valve (60.3); Step 5.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 5.3, open the connecting ball valve (61.2), the fourth ball valve (63.1), and the sixth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) and the pressure reducing valve (77) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 5.4, input a periodic signal to the valve to be tested, detect the leakage of the T oil port through the second flow meter (74), open the tenth ball valve (59.2) and the twenty-first ball valve (41.1), close the fifth ball valve (59.1) and the fourteenth ball valve (41.2), and detect the leakage of the Y oil port through the second flow meter (74); Output flow-input signal characteristic test under constant valve pressure drop: Step 6.1, open the second ball valve (60.9), the seventh ball valve (60.11), the thirteenth ball valve (60.4), the nineteenth ball valve (60.1), the twentieth ball valve (60.5), the fourteenth ball valve (41.2), the sixteenth ball valve (60.8), the eighteenth ball valve (60.3), and the fifth ball valve (59.1); Step 6.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 6.3, open the third outlet ball valve (62.1), the fourth ball valve (63.1), and the sixth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) and the pressure reducing valve (77) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 6.4, close the first proportional throttle valve (78.1) and the second proportional throttle valve (78.2); Step 6.5: Input a periodic signal to the valve to be tested, and plot its output flow-input signal characteristic curve with the given signal percentage as the X-axis and the flow signal as the Y-axis; Threshold characteristic test: Step 7.1, open the second ball valve (60.9), the seventh ball valve (60.11), the thirteenth ball valve (60.4), the nineteenth ball valve (60.1), the twentieth ball valve (60.5), the fourteenth ball valve (41.2), the sixteenth ball valve (60.8), the eighteenth ball valve (60.3), and the fifth ball valve (59.1); Step 7.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 7.3, open the third outlet ball valve (62.1), the fourth ball valve (63.1), and the sixth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) and the pressure reducing valve (77) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 7.4, close the first proportional throttle valve (78.1) and the second proportional throttle valve (78.2); Step 7.5: Input a signal to the valve to be tested so that the output flow is 25% of the rated flow. Then gradually reduce the input signal so that the flow also decreases accordingly. Slowly reduce the input signal to minimize the dynamic impact. Step 7.6, record the input signal when the flow rate starts to decrease; Step 7.7, calculate the threshold by calculating the signal change increment based on the algebraic difference between the two recorded signal values, and draw a curve with the given signal percentage as the X-axis and the flow signal as the Y-axis; Step 7.8: Repeat the test steps from Step 7.4 to Step 7.6 at 75% of the rated flow rate; Step 7.9: Input the opposite signal and repeat the test steps from step 7.4 to step 7.7; Step 7.10, when testing the zero position of the zero opening and negative cover valves, use this threshold characteristic test method; Throttling regulation characteristics test: When from oil supply port P to working oil port A: Step 8.1.1, open the second ball valve (60.9), the seventh ball valve (60.11), the twelfth ball valve (60.6), the sixteenth ball valve (60.8), the eighteenth ball valve (60.3), and the fifth ball valve (59.1); Step 8.1.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 8.1.3, open the third outlet ball valve (62.1), the fourth ball valve (63.1), and the sixth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) and the pressure reducing valve (77) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; In step 8.1.4, slowly increase the input signal from zero to the rated positive value, and draw a flow curve from the oil supply port P to the working oil port A with the given signal as the X-axis and the flow signal as the Y-axis; From the working oil port A to the return oil port T: Step 8.2.1, open the second ball valve (60.9), the seventeenth ball valve (60.2), the sixteenth ball valve (60.8), the twelfth ball valve (60.6), the twenty-first ball valve (41.1), and the fifth ball valve (59.1); Step 8.2.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 8.2.3, open the third outlet ball valve (62.1), the fourth ball valve (63.1), and the sixth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) and the pressure reducing valve (77) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; In step 8.2.4, slowly increase the input signal from zero to the rated positive value, and draw a flow curve from the working oil port A to the return oil port T with the given signal as the X-axis and the flow signal as the Y-axis; From the oil supply port P to the working oil port B: Step 8.3.1, open the second ball valve (60.9), the seventh ball valve (60.11), the eleventh ball valve (60.7), the sixteenth ball valve (60.8), the eighteenth ball valve (60.3), and the fifth ball valve (59.1); Step 8.3.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 8.3.3, open the third outlet ball valve (62.1), the fourth ball valve (63.1), and the sixth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) and the pressure reducing valve (77) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; In step 8.3.4, slowly increase the input signal from zero to the rated positive value, and draw a flow curve from the oil supply port P to the working oil port B with the given signal as the X-axis and the flow signal as the Y-axis; From the working oil port B to the return oil port T: Step 8.4.1, open the second ball valve (60.9), the seventeenth ball valve (60.2), the sixteenth ball valve (60.8), the eleventh ball valve (60.7), the twenty-first ball valve (41.1), and the fifth ball valve (59.1); Step 8.4.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 8.4.3, open the third outlet ball valve (62.1), the fourth ball valve (63.1), and the sixth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) and the pressure reducing valve (77) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 8.4.4: Slowly increase the input signal from zero to the rated positive value, and draw the flow curve from the working oil port B to the return oil port T with the given signal as the X-axis and the flow signal as the Y-axis.

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