Ultra-large flow hydraulic test device and its use and test method

Abstract

Ultra-large flow hydraulic test device and use and test method. The product comprises: a pump unit, the pump unit is connected to an accumulator unit, a high-pressure leakage test device, and a large flow test device, the pump unit comprises a motor, the motor is connected to a high-pressure plunger pump, the high-pressure plunger pump is connected to a flexible joint, the flexible joint is connected to a butterfly valve, the high-pressure plunger pump is connected to an electromagnetic overflow valve and a high-pressure filter, the high-pressure filter is connected to a check valve, and the check valve is connected to a pressure gauge and a high-pressure ball valve. The present invention is used for ultra-large flow hydraulic testing.

Description

Technical Field

[0001] The invention relates to an ultra-large flow hydraulic pressure testing device and a use and testing method thereof. Background Art

[0002] There is no specific test device for flow testing of ultra-large flow hydraulic valves (Δp=7bar Q=36000L / min) in the country or even in the world. The flow data of ultra-large flow hydraulic valves before this application was calculated based on the flow formula. First, a small flow test is performed on the ultra-large flow hydraulic valve at low pressure difference, and the flow coefficient of the valve is obtained based on the test data. The large flow data of the ultra-large flow hydraulic valve at high pressure difference is calculated based on the flow coefficient. The data obtained by this test method has the following defects: 1. Pure theoretical data is only of reference value; 2. The deviation is relatively large; 3. It cannot directly reflect the true performance of the ultra-large flow hydraulic valve at high pressure difference. Summary of the invention

[0003] The purpose of the present invention is to provide an ultra-large flow hydraulic test device and a use and test method which fills the gap in the flow performance test of ultra-large flow hydraulic components and also provides real and reliable test data for the flow performance of ultra-large flow hydraulic components.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A super-large flow hydraulic testing device, which consists of: a pump unit, the pump unit is connected to a high-pressure leakage testing device and a large flow testing device, the pump unit includes a motor, the motor is connected to a high-pressure plunger pump, the high-pressure plunger pump is connected to a flexible joint, the flexible joint is connected to a butterfly valve, the high-pressure plunger pump is connected to an electromagnetic overflow valve and a high-pressure filter, the high-pressure filter is connected to a one-way valve, and the one-way valve is connected to a pressure gauge and a high-pressure ball valve.

[0006] The ultra-large flow hydraulic test device and the high-pressure leakage test device include an upper accumulator group, which is connected to a lower accumulator group. The upper accumulator group is 3 groups with a model of 8×50L, and the lower accumulator group is 2 groups with a model of 4×50L.

[0007] The ultra-large flow hydraulic testing device and the high-pressure leakage testing device include an AG-1 high-pressure ball valve, the high-pressure ball valve AG-1 is connected to a high-pressure ball valve PG-1, the high-pressure ball valve PG-1 is connected to an ultra-large flow hydraulic valve, the ultra-large flow hydraulic valve is connected to a pressure relay, the pressure relay is connected to a throttle valve, the ultra-large flow hydraulic valve is connected to a high-pressure ball valve X-2, the ultra-large flow hydraulic valve is connected to a flow meter, and the flow meter is connected to a one-way valve.

[0008] The ultra-large flow hydraulic testing device comprises a front gas-liquid dual-purpose oil tank, the front gas-liquid dual-purpose oil tank is connected to a float-type liquid level displacement sensor, the float-type liquid level displacement sensor is connected to a diffuser, the diffuser is installed on the front gas-liquid dual-purpose oil tank, the diffuser is connected to a switch valve, the switch valve is connected to an ultra-large flow hydraulic valve, the ultra-large flow hydraulic valve is connected to one end of a first pressure sensor, the other end of the first pressure sensor is connected to the lower end of the rear gas-liquid dual-purpose oil tank, the upper end of the rear gas-liquid dual-purpose oil tank is connected to one end of a second pressure sensor, the other end of the second pressure sensor is connected to one end of a pressure gauge, the other end of the pressure gauge is connected to a lower pressure gauge, the rear gas-liquid dual-purpose oil tank is connected to a gas tank, and the gas tank is connected to a muffler.

[0009] A method for using a super-large flow hydraulic test device, first, the hydraulic oil is in the front gas-liquid dual-purpose oil tank, and reaches a predetermined liquid level, close the switch valves T-2, T-1, T-3, A-1, A-2, Q-4, Q-6, BX-1, P-1, P-2 and open the switch valves Q-3 and Q-5; the air compressor starts working, when the gas tank pressure reaches the predetermined pressure, the switch valves P-1 and P-2 are opened, and the hydraulic oil enters the rear gas-liquid dual-purpose oil tank through the super-large flow hydraulic valve; when the liquid level reaches the low liquid level, the super-large flow hydraulic valve is energized, and the switch valves P-1 and P-2 are closed at the same time; this cycle is a test of the oil passing capacity of the super-large flow hydraulic valve PA, and the liquid flow is calculated by the descending speed of the liquid level displacement sensor after completion; after the first cycle is completed, the hydraulic oil is in the low-pressure oil tank 2. At this time, the switch valves Q-3 and Q-5 are closed, and the switch valve Q-6 is opened for exhaust. After the exhaust is completed, open T-1 and Q-4; the air compressor starts working, and when the gas tank pressure reaches the preset pressure, the ultra-large flow hydraulic valve is energized, the switch valves A-1 and A-2 are opened, and the hydraulic oil enters the front gas-liquid dual-purpose oil tank through the ultra-large flow hydraulic valve; when the liquid level reaches the preset level, the ultra-large flow hydraulic valve loses power, and the switch valves A-1 and A-2 are closed at the same time; this cycle is a test of the oil-passing capacity of the ultra-large flow hydraulic valve AT. After completion, the liquid flow is calculated by the rising and falling speed of the liquid level displacement sensor; this cycle is repeated to perform liquid flow tests under different pressures.

[0010] A test method for an ultra-large flow hydraulic test device, the test method includes a high-pressure leakage test and a low-pressure large flow test, the high-pressure leakage test includes six steps, the first step is the inspection before the test, checking the opening and closing status of each ball valve, each switch valve is installed with a position detection, and there is a state detection and partial interlocking to prevent misoperation; the second step is to start the pump unit accumulator to charge, and the motor direction is electrically determined before the motor is started. After the direction is correct, DT1, DT2, and DT3 are energized, and the accumulator is charged. When the pressure reaches 350bar When the pressure is charged, the accumulator is charged; after the stamping is completed, the accumulator is connected to the ball valve, DT1, DT2, and DT3 lose power, and the system is depressurized; the P-port high-pressure ball valve PG-1 is opened, DT1, DT2, and DT3 are energized to increase the system pressure; the third step is the PA leakage test, the pilot solenoid valve is energized, the ultra-large flow hydraulic valve AT is connected, and the A throttle valve is modulated to the minimum. At the same time, 5 groups of accumulator-connected ball valves are opened to collect pressure relay and flow meter signals; when the accumulator pressure drops, DT1, DT2, and DT3 lose power, the system is depressurized, and the high-pressure ball valve PG-1 is closed after the pressure is released; repeat the second and third steps and measure multiple times; the fourth step is the PT leakage test. After completing the second step, skip the third step and the pilot is turned on. The solenoid valve loses power, the cartridge valve PA is open, the A throttle valve is modulated to the minimum, the high-pressure ball valves PG-1 and AG-1 are opened, the pressure relay, temperature relay, and flow meter signals are collected, and the accumulator pressure is stopped when the pressure is reduced. The high-pressure ball valves PG-1 and AG-1 are closed, and the second and fourth steps are repeated for multiple measurements; in the fifth step, when the oil level in the low-pressure oil tank is low, the pump unit is stopped, BX-1 and Q-6 are closed, and T-2, T-3, and Q-3 are opened until the low-pressure oil pipe level meets the test requirements, Q-3, T-2, and T-3 are closed, Q-6 is opened first to release the pressure, and then BX-1 is opened, and the second, third, and fourth steps are repeated to conduct the test; in the sixth step, the accumulator is charged to 350 bar.

[0011] The test method of the ultra-large flow hydraulic test device, the low-pressure and large flow test includes four steps, the first step is the inspection before the test, checking the opening and closing status of each ball valve, each switch valve is installed with position detection, and there are state detection and partial interlocking to prevent misoperation, the low-pressure oil tank is full of oil, the accumulator group pressure is 15MPa, and the gas tank is filled with air at a pressure of 0.4-0.8MPa; the second step is to fill the gas tank with the corresponding pressure according to the experimental requirements, PA flow test, first open the Q-5, Q-3, A-1, A-2 ball valves, and open P-1 and P-2 at the same time, the oil is compressed from the low-pressure oil tank one through the valve PA to the low-pressure oil tank two, the liquid level of the low-pressure oil tank one starts to drop from the expected liquid level of 1050 to the stop liquid level of 1900, and the system alarms when the oil reaches the stop liquid level of 1900, and the ultra-large flow hydraulic valve is energized, Close butterfly valves P-1, P-2, A-1, and A-2, and collect signals from pressure relays, temperature relays, and liquid level displacement sensors during the oil level drop process; the third step is to inflate the gas tank to the corresponding pressure according to the experimental requirements, perform AT flow test, close Q-3 and Q-5 in sequence, open Q-6 to release the pressure first, then open Q-4 and T-1 pilot valves to get power, and open A-1 and A-2 at the same time. The oil is transported from low-pressure tank 2 to low-pressure tank 1 through valve AT by compressed air, and the liquid level of low-pressure tank 1 starts to drop from the 1900 stop level to 1050 stop. When the oil reaches the 1050 stop level, the system alarms, the super-large flow hydraulic valve loses power, and the butterfly valves A-1, A-2, and T-1 are closed to collect signals from pressure relays, temperature relays, and liquid level displacement sensors; the fourth step is to close Q-4, A-1, A-2, T-1, and Q-6 in sequence, repeat the second and third steps, and adjust the gas tank inflation pressure as needed to test the oil flow rate of the valve under different pressures; the test is completed.

[0012] Beneficial Effects

[0013] 1. The present invention solves the defects of the test method of ultra-large flow (Q=36000L / min) when the ultra-large flow hydraulic valve has a high pressure difference (Δp=7bar); at the same time, it can also perform a high pressure (350bar) leakage test on the ultra-large flow hydraulic test device; and directly test the real performance of the ultra-large flow when the ultra-large flow hydraulic valve has a high pressure difference; at the same time, it also reversely verifies the correctness of the flow formula at ultra-large flow.

[0014] 2. The present invention can perform high-pressure (350 bar) leakage test and low-pressure (3-7 bar, 36000 L / min) ultra-large flow performance test on ultra-large flow hydraulic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 This is the schematic diagram of this product.

[0016] Attached Figure 2 Yes Figure 1Some detail pictures.

[0017] Attached Figure 3 This is the schematic diagram of the pump unit of the super-large flow hydraulic device of this product.

[0018] Attached Figure 4 It is the principle diagram of the accumulator group device of this product.

[0019] Attached Figure 5 This is the schematic diagram of the high-pressure leakage test device of this product.

[0020] Attached Figure 6 This is the schematic diagram of the low-pressure and high-flow test device of this product.

[0021] Attached Figure 7 This is an external view of the diffuser of this product.

[0022] Attached Figure 8 This is the schematic diagram of the oil tank level control of this product. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] Example 1

[0025] A super-large flow hydraulic testing device, which consists of: a pump unit 1, the pump unit is connected to a high-pressure leakage testing device 3 and a large flow testing device 4, the pump unit includes a motor 8, the motor is connected to a high-pressure plunger pump 7, the high-pressure plunger pump is connected to a flexible joint 6, the flexible joint is connected to a butterfly valve 5, the high-pressure plunger pump is connected to an electromagnetic overflow valve 9 and a high-pressure filter 10, the high-pressure filter is connected to a one-way valve 11, and the one-way valve is connected to a pressure gauge 12 and a high-pressure ball valve 13.

[0026] Pump unit: provides high-pressure power source, accumulator unit 2: stores high-pressure oil, high-pressure and high-flow power source, high-pressure leakage test device, high-pressure leakage test, (the accumulator unit and pump unit together form a high-pressure leakage test system, which can test the leakage flow of 500L / mind at 350bar), high-pressure state ultra-large flow hydraulic valve reversing test, ultra-large flow hydraulic valve pressure test. 4. High flow test device: through the air compressor and two 5 The gas tank provides the power source, and the compressed air drives the front gas-liquid dual-purpose oil tank (effective volume 6 ) enters the gas-liquid dual-purpose oil tank (effective volume 6 ). The test capability reaches pressure difference Δp=7bar and flow rate Q=36000L / min.

[0027] Example 2

[0028] The ultra-large flow hydraulic testing device described in Example 1, the high-pressure leakage testing device includes an upper accumulator group 34, the upper accumulator group is connected to the lower accumulator group 35, the upper accumulator group is 3 groups, the model is 8×50L, and the lower accumulator group is 2 groups, the model is 4×50L.

[0029] Accumulator set as attached Figure 3 It consists of 3 groups of 8×50L accumulator groups and 2 groups of 4×50L accumulator groups. The accumulator group has a capacity of 3×8×50+2×4×50=1600L. Together with the pump unit, it can perform high-pressure leakage tests on ultra-large flow hydraulic valves and provide pilot control oil for low-pressure and large-flow systems.

[0030] Example 3

[0031] The ultra-large flow hydraulic testing device described in Example 1, the high-pressure leakage testing device includes an AG-1 high-pressure ball valve 14, the high-pressure ball valve (AG-1) is connected to a high-pressure ball valve (PG-1) 16, the high-pressure ball valve (PG-1) is connected to an ultra-large flow hydraulic valve 19, the ultra-large flow hydraulic valve is connected to a pressure relay 20, the pressure relay is connected to a throttle valve 21, the ultra-large flow hydraulic valve is connected to a high-pressure ball valve (X-2) 15, the ultra-large flow hydraulic valve is connected to a flow meter 17, and the flow meter is connected to a one-way valve 18.

[0032] High pressure leakage test device (such as attached Figure 4 ) includes high-pressure ball valve (AG-1), high-pressure ball valve (X-2), high-pressure ball valve (PG-1), flow meter (high pressure 400bar, high precision, large flow 800L / min), check valve, ultra-large flow hydraulic valve, pressure relay: detect the inlet and outlet pressure, throttle valve: plays the role of buffering during high-pressure switching and unloading the high-pressure oil in the pipeline and tooling.

[0033] The high-pressure leakage test device, accumulator group, and pump unit together form a high-pressure leakage test system, which can test the leakage of different inlet and outlet ports by turning on and off each high-pressure ball valve. The system can test the leakage flow of 500L / mind at 350bar, as well as the reversing test of ultra-large flow hydraulic valves under high pressure and the pressure resistance test of ultra-large flow hydraulic valves.

[0034] Example 4

[0035] The ultra-large flow hydraulic testing device described in Example 1, the large flow testing device includes a front gas-liquid dual-purpose oil tank 23, the front gas-liquid dual-purpose oil tank is connected to a float-type liquid level displacement sensor 28, the float-type liquid level displacement sensor is connected to a diffuser 24, the diffuser is installed on the front gas-liquid dual-purpose oil tank, the diffuser is connected to a switch valve 25, the switch valve is connected to an ultra-large flow hydraulic valve 26, the ultra-large flow hydraulic valve is connected to one end of a first pressure sensor 27, the other end of the first pressure sensor is connected to the lower end of a rear gas-liquid dual-purpose oil tank 33, the upper end of the rear gas-liquid dual-purpose oil tank is connected to one end of a second pressure sensor 32, the other end of the second pressure sensor is connected to a pressure gauge 31, the pressure gauge is connected to a lower pressure gauge 30, the rear gas-liquid dual-purpose oil tank is connected to a gas tank 29, and the gas tank is connected to a muffler 22.

[0036] Low pressure and high flow test device (such as the attached Figure 5 ) Including muffler: eliminates the noise of compressed gas discharge when exhausting, and is also a channel for the free flow of atmosphere inside and outside the tank when the tank level rises; gas-liquid dual-purpose tank: the design pressure of the tank is 10bar, the operating pressure is 8bar, and the volume is 6.24 , with an inner diameter of 1800mm. There are two identical oil tanks for the dual-purpose gas-liquid oil tank, numbered as low-pressure oil tank 1 (front dual-purpose gas-liquid oil tank) and low-pressure oil tank 2 (rear dual-purpose gas-liquid oil tank). Both oil tanks are equipped with diffusers at the inlet and outlet (see attached). Figure 6 ) to reduce oil level fluctuations. One of the oil tanks is equipped with a liquid level displacement sensor, which detects changes in the liquid level through changes in the displacement sensor. Two DN150 ball valves are installed on the top of the oil tank, one of which is connected to the muffler and the other is connected to the gas tank. These four ball valves are used to control the gas in and out of the two oil tanks, and to switch back and forth between the pressure tank and the oil storage; diffuser (to buffer the impact of oil at large flow and reduce liquid level fluctuations. The opening direction of the diffuser is inclined downward); switch valve (serial number X-1, T-2, T-1, T-3, Q-3, Q-4, Q-5, Q-6, BX-1, A-1, A-2, P-1, P-2); ultra-large flow hydraulic valve; pressure sensor (measuring range 0-16bar) to calculate the pressure difference through the pressure sensor; float type liquid level displacement sensor (effective range 2000mm): ordinary liquid level sensors cannot withstand pressure, so the high-precision pressure-resistant displacement sensor is modified (the magnetic ring of the original displacement sensor is replaced with a float with a coil); gas tank (design pressure 10bar, operating pressure 8bar, volume 5 ) After the two gas tanks are connected in parallel, they are connected to low-pressure oil tank 1 and low-pressure oil tank 2 respectively; air compressor: volume flow 6.26 / min power 37kW working pressure 0.8MPa; pressure gauge: range 0-1.6MPa to display gas tank pressure; pressure sensor: monitor gas tank pressure.

[0037] Example 5

[0038] A method for using a super-large flow hydraulic test device, first, the hydraulic oil is in the front gas-liquid dual-purpose oil tank, and reaches a predetermined liquid level, close the switch valves T-2, T-1, T-3, A-1, A-2, Q-4, Q-6, BX-1, P-1, P-2 and open the switch valves Q-3 and Q-5; the air compressor starts to work, when the gas tank pressure reaches the predetermined pressure, the switch valves P-1 and P-2 are opened, and the hydraulic oil enters the rear gas-liquid dual-purpose oil tank through the super-large flow hydraulic valve; when the liquid level reaches the low liquid level, the super-large flow hydraulic valve is energized, and the switch valves P-1 and P-2 are closed at the same time; this cycle is a test of the oil passing capacity of the super-large flow hydraulic valve PA, and the liquid flow is calculated by the descending speed of the liquid level displacement sensor after completion; after the first cycle is completed, the hydraulic oil is in the low-pressure oil tank 2. At this time, the switch valves Q-3 and Q-5 are closed, and the switch valve Q-6 is opened for exhaust. After the exhaust is completed, open T-1 and Q-4; the air compressor starts working, and when the gas tank pressure reaches the preset pressure, the ultra-large flow hydraulic valve is energized, the switch valves A-1 and A-2 are opened, and the hydraulic oil enters the front gas-liquid dual-purpose oil tank through the ultra-large flow hydraulic valve; when the liquid level reaches the preset level, the ultra-large flow hydraulic valve loses power, and the switch valves A-1 and A-2 are closed at the same time; this cycle is a test of the oil-passing capacity of the ultra-large flow hydraulic valve AT. After completion, the liquid flow is calculated by the rising and falling speed of the liquid level displacement sensor; this cycle is repeated to perform liquid flow tests under different pressures.

[0039] Calculate the liquid flow formula: Formula where Q is the flow through the valve port ( / S), Cα—flow coefficient, A—flow area of ​​valve port (m 2 ), ρ—liquid density, kg / (700-900), Δp—pressure drop before and after the valve port (N / m 2 ).

[0040] Example 6

[0041] A test method for an ultra-large flow hydraulic test device, test steps for the ultra-large flow hydraulic test device, the ultra-large flow hydraulic valve test is divided into a high-pressure leakage test and a low-pressure large flow test, and the test is performed with reference to the schematic diagram of the ultra-large flow hydraulic test device.

[0042] The high pressure leak test consists of six steps:

[0043] The first step is the inspection before the test, check the opening and closing status of each ball valve, (switch valve BX-1-BX-4, T-1 is open, switch valve P-1, P-2, A-1, A-2 is closed, switch valve Q-1, Q-3, Q-4 is closed, Q-5, Q-6 is opened, return oil ball valve T-2, T-3 is closed, pump outlet switch valve BC-1, BC-2, BC-3 is opened, accumulator inlet and outlet ball valves are opened, control oil ball valve X-1 is closed, X-2 is opened; large flow hydraulic valve P port ball valve PG-1, AG-1 is closed) each switch valve is installed with position detection, and has status detection and partial interlocking to prevent misoperation.

[0044] The second step is to start the pump unit to charge the accumulator. Before starting the motor, the motor direction is electrically determined. After the direction is correct, DT1, DT2, and DT3 are energized and the accumulator is charged. When the pressure reaches 350 bar, the charging is completed. After the stamping is completed, the accumulator connection ball valve is closed, DT1, DT2, and DT3 lose power, and the system is depressurized. Open the P-port high-pressure ball valve PG-1, DT1, DT2, and DT3 to energize the system to increase the pressure.

[0045] The third step is the PA leakage test. The pilot solenoid valve is energized, the super-large flow hydraulic valve AT is open, the A throttle valve is modulated to the minimum, and 5 groups of accumulator-connected ball valves are opened at the same time to collect pressure relay and flow meter signals. When the accumulator pressure drops to a certain pressure, DT1, DT2, and DT3 lose power, the system is depressurized, and the high-pressure ball valve PG-1 is closed after the pressure is released. Repeat the second and third steps and measure multiple times.

[0046] The fourth step is PT leakage test. After completing the second step, skip the third step. The pilot solenoid valve loses power, the cartridge valve PA is open, the A throttle valve is modulated to the minimum, the high-pressure ball valves PG-1 and AG-1 are opened, and the pressure relay, temperature relay, and flow meter signals are collected. When the accumulator pressure drops to a certain pressure, stop and close the high-pressure ball valves PG-1 and AG-1. Repeat the second and fourth steps and measure multiple times.

[0047] Step 5: When the oil level in the low-pressure tank is low, stop the pump unit, close BX-1 and Q-6, open T-2, T-3, and Q-3, until the liquid level in the low-pressure oil pipe 2 meets the test requirements, close Q-3, T-2, and T-3, open Q-6 to release the pressure first, and then open BX-1; repeat steps 2, 3, and 4 to conduct the test.

[0048] Step 6: Charge the accumulator to 350 bar.

[0049] Note: It is strictly forbidden to open the A-port high-pressure ball valve AG-1 during high-pressure testing.

[0050] Example 7

[0051] The test method of the ultra-large flow hydraulic test device described in Example 6, the low-pressure and large-flow test includes four steps, the first step is the inspection before the test, checking the opening and closing status of each ball valve, (the switch valves T-1A-1, A-2, BX-1-BX-4 are closed, the switch valves P-1 and P-2 are closed, the switch valves Q-1 are opened, Q-3, Q-4, Q-5, and Q-6 are closed, the return oil ball valves T-2 and T-3 are closed, the pump outlet ball valves BC-1, BC-2, and BC-3 are closed, the accumulator inlet and outlet ball valves are all opened, the control oil ball valve X-1 is opened, and X-2 is closed. The cartridge valve P port ball valves PG-1 and AG-1 are closed) each switch valve is installed The position is detected, and there are status detection and partial interlocking to prevent misoperation; once the low-pressure oil tank is full of oil, the accumulator group pressure is 15MPa; the gas tank inflation pressure is 0.4-0.8MPa.

[0052] The second step is to inflate the gas tank to the corresponding pressure according to the experimental requirements; for the PA flow test, first open the Q-5, Q-3, A-1, and A-2 ball valves, and then open P-1 and P-2 at the same time; the oil is discharged from the low-pressure tank one through the valve PA to the low-pressure tank two by compressed air, and the liquid level of the low-pressure tank one starts to drop from the expected level of 1050 to the stop level of 1900. When the oil reaches the stop level of 1900, the system alarms, and the ultra-large flow hydraulic valve is energized to close the butterfly valves P-1, P-2, A-1, and A-2; during the oil level drop process, the pressure relay, temperature relay, and liquid level displacement sensor signals are collected.

[0053] Inner diameter of oil tank: 1800mm; 1mm oil tank volume: πr 2 l=3.14*900*900*1=2.543L; total volume of oil dropped: 850*2.543=2161.55L.

[0054] The third step is that when the maximum flow rate of the valve is 35000L / min, the liquid level drops and the collection time is 2161.55*60 / 35000=3.7s. The tank liquid level is as shown in the attached Figure 7. Inflate the gas tank to the corresponding pressure according to the experimental requirements; AT flow test, close Q-3 and Q-5 in sequence, open Q-6 to release the pressure first, then open Q-4, T-1 pilot valve to get power, and open A-1 and A-2 at the same time; the oil is compressed from low-pressure oil tank 2 through valve AT to low-pressure oil tank 1, and the liquid level of low-pressure oil tank 1 starts to drop from the 1900 stop level to 1050 stop. When the oil reaches the 1050 stop level, the system alarms, the super-large flow hydraulic valve loses power, and the butterfly valves A-1, A-2, and T-1 are closed; collect pressure relays, temperature relays, and liquid level displacement sensor signals. Inner diameter of oil tank: 1800mm, volume of 1mm oil tank: πr 2 l=3.14*900*900*1=2.543L; total volume of oil drop: 750*2.543=1907.25L; when the maximum flow rate of the valve is 11000L / min, the liquid level drop collection time is 1907.25*60 / 11000=10.4s.

[0055] The fourth step is to close Q-4, A-1, A-2, T-1, and Q-6 in sequence, and repeat the second and third steps; the air tank inflation pressure is adjusted as needed to test the oil flow rate of the valve under different pressures to complete the test.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A super large flow hydraulic test device, comprising: a pump unit, characterized in that : The pump unit is connected to a high-pressure leakage test device and a large flow test device, the pump unit includes a motor, the motor is connected to a high-pressure plunger pump, the high-pressure plunger pump is connected to a flexible joint, the flexible joint is connected to a butterfly valve, the high-pressure plunger pump is connected to an electromagnetic overflow valve and a high-pressure filter, the high-pressure filter is connected to a one-way valve, and the one-way valve is connected to a pressure gauge and a high-pressure ball valve; The high-pressure leakage test device includes a high-pressure ball valve AG-1, a high-pressure ball valve X-2, a high-pressure ball valve PG-1, a flow meter, a one-way valve, an ultra-large flow hydraulic valve, a pressure relay, and a throttle valve. The high-pressure ball valve AG-1 is connected to the high-pressure ball valve PG-1, the high-pressure ball valve PG-1 is connected to the ultra-large flow hydraulic valve, the ultra-large flow hydraulic valve is connected to the pressure relay, the pressure relay is connected to the throttle valve, the ultra-large flow hydraulic valve is connected to the high-pressure ball valve X-2, the ultra-large flow hydraulic valve is connected to the flow meter, and the flow meter is connected to the one-way valve; The large flow testing device includes a front gas-liquid dual-purpose oil tank, the front gas-liquid dual-purpose oil tank is connected to a float-type liquid level displacement sensor, the float-type liquid level displacement sensor is connected to a diffuser, the diffuser is installed on the front gas-liquid dual-purpose oil tank, the diffuser is connected to a switch valve, the switch valve is connected to an ultra-large flow hydraulic valve, the ultra-large flow hydraulic valve is connected to one end of a first pressure sensor, the other end of the first pressure sensor is connected to the lower end of the rear gas-liquid dual-purpose oil tank, the upper end of the rear gas-liquid dual-purpose oil tank is connected to one end of a second pressure sensor, the other end of the second pressure sensor is connected to one end of a pressure gauge, the other end of the pressure gauge is connected to a lower pressure gauge, the rear gas-liquid dual-purpose oil tank is connected to a gas tank, and the gas tank is connected to a muffler.

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