Quick switching test circuit for hydraulic valve testing

Abstract

The utility model discloses a quick switching test loop for hydraulic valve detection relates to hydraulic detection technical field. Including hydraulic pump, motor, first overflow valve, pressure gauge, pressure sensor, first flowmeter, first ball valve, second ball valve, third ball valve, fourth ball valve, second flowmeter, second overflow valve, oil tank, four ball valves cooperate and open and shut and form two loops, one loop carries out cut -off test to pipeline explosion -proof valve, and another loop carries out reset to the pipeline explosion -proof valve in cut -off state, and first flowmeter can detect whether the cut -off flow of pipeline explosion -proof valve is up to standard, and according to the digital difference value of first flowmeter and second flowmeter judges whether pipeline explosion -proof valve has leakage. The utility model can avoid the frequent dismounting of each component of test pipeline in the testing process, reduce hydraulic oil leakage, effectively reduce the testing time, and accelerate the testing progress.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic testing technology, and more specifically, it relates to a fast switching test circuit for testing hydraulic valves. Background Technology

[0002] Hydraulic testing technology, as a highly specialized and precise industrial testing method, plays a crucial role in ensuring the safe and reliable operation of various hydraulic systems. During hydraulic testing, certain valves require both forward and reverse testing. Especially in processes requiring multiple verification tests, test engineers often need to frequently change and disassemble pipelines, which not only increases unnecessary testing time but also leads to increased oil leakage during the testing process. Rapid switching test circuits for hydraulic valves allow the power source oil to enter the valve under test from either the forward or reverse direction, avoiding frequent disassembly during testing and maximizing the speed of valve block testing.

[0003] The elevator speed limit shut-off valve, also known as the pipeline explosion-proof valve, is a core safety component of hydraulic elevators, installed in the hydraulic system pipelines. Its application is to monitor oil speed changes in real time through an internal mechanical mechanism when an oil pipe suddenly ruptures or the car descends at excessive speed. When the flow rate exceeds a set safety value, the valve core automatically and instantly cuts off the oil circuit under pressure differential, preventing the car from continuing to fall and providing a final safety protection for passengers. It is a crucial device for preventing hydraulic elevator stall and ensuring passenger safety. Therefore, the shut-off and reset tests of the pipeline explosion-proof valve are extremely important. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a fast switching test circuit for hydraulic valve testing, which can avoid frequent disassembly of various components in the test pipeline during the test, reduce hydraulic oil leakage, effectively reduce test time, and speed up the test progress.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a fast-switching test circuit for testing hydraulic valves, including a hydraulic pump, a motor, a first relief valve, a pressure gauge, a pressure sensor, a first flow meter, a first ball valve, a second ball valve, a third ball valve, a fourth ball valve, a second flow meter, a second relief valve, and an oil tank. The oil inlet of the hydraulic pump is connected to the oil tank. The motor drives the hydraulic pump to work. The oil outlet of the hydraulic pump is connected to the inlet of the first flow meter. The outlet of the first flow meter is connected to the inlet of the first ball valve. The outlet of the first ball valve is connected to the inlet of a pipeline explosion-proof valve. The outlet of the pipeline explosion-proof valve is connected to the inlet of the third ball valve. The outlet of the third ball valve is connected to the inlet of the second flow meter. The outlet of the second flow meter is connected to the inlet of the second relief valve. The outlet of the second relief valve is connected to the oil tank. The pipeline explosion-proof valve is the valve under test. The inlet of the second ball valve is connected to the pipeline between the first flow meter and the first ball valve, and the outlet of the second ball valve is connected to the pipeline between the explosion-proof valve and the third ball valve; the inlet of the fourth ball valve is connected to the pipeline between the first ball valve and the explosion-proof valve, and the outlet of the fourth ball valve is connected to the pipeline between the third ball valve and the second flow meter. The inlet of the first relief valve is connected to the pipeline between the hydraulic pump and the first flow meter, and the outlet of the first relief valve is connected to the oil tank; the pressure gauge and pressure sensor are both connected to the pipeline where the first relief valve is located and are located between the outlet of the hydraulic pump and the inlet of the first relief valve. A fourth filter is installed in the oil tank. The outlet of the fourth filter is connected to the inlet of the hydraulic pump. The first filter is connected to the pipeline where the outlet of the hydraulic pump is located. The second filter is connected to the pipeline where the outlet of the second relief valve is located. The third filter is connected to the pipeline where the outlet of the first relief valve is located.

[0006] Preferably, a fifth ball valve is provided on the pipeline between the outlet of the fourth filter and the inlet of the hydraulic pump, and a check valve is provided on the pipeline where the outlet of the hydraulic pump is located.

[0007] The beneficial effects of adopting the above technical solution are as follows: This utility model ingeniously utilizes the opening and closing of the first, second, third, and fourth ball valves to form two test circuits. One test circuit performs a cut-off test on the pipeline explosion-proof valve, and the other test circuit performs a reset test on the pipeline explosion-proof valve. The entire testing process only requires opening and closing four ball valves to complete the switching between the two test circuits, without the need to disassemble components, greatly reducing testing time and accelerating the testing progress. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the rapid switching of test circuits in this embodiment.

[0009] Figure 2 This is a circuit diagram for testing the valve's shut-off function.

[0010] Figure 3 This is a circuit diagram for resetting the valve.

[0011] In the diagram: 1. Hydraulic pump, 2. Motor, 3. First relief valve, 4. Check valve, 5. First filter, 6. Pressure gauge, 7. Pressure sensor, 8. First flow meter, 9. First ball valve, 10. Second ball valve, 11. Pipeline explosion-proof valve, 12. Third ball valve, 13. Fourth ball valve, 14. Flow meter, 15. Second relief valve, 16. Second filter, 17. Third filter, 18. Fifth ball valve, 19. Fourth filter, 20. Oil tank. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0013] like Figure 1 As shown, the test circuit includes a hydraulic pump 1, a motor 2, a first relief valve 3, a check valve 4, a first filter 5, a pressure gauge 6, a pressure sensor 7, a first flow meter 8, a first ball valve 9, a second ball valve 10, a third ball valve 12, a fourth ball valve 13, a second flow meter 14, a second relief valve 15, a second filter 16, a third filter 17, a fifth ball valve 18, a fourth filter 19, and an oil tank 20. The pipeline explosion-proof valve 11 is the valve under test. The oil inlet of the hydraulic pump 1 is connected to the oil tank 20, and the motor 2 drives the hydraulic pump 1 to operate. The outlet of hydraulic pump 1 is connected to the inlet of the first flow meter 8. The outlet of the first flow meter 8 is connected to the inlet of the first ball valve 9. The outlet of the first ball valve 9 is connected to the inlet of the pipeline explosion-proof valve 11. The outlet of the pipeline explosion-proof valve 11 is connected to the inlet of the third ball valve 12. The outlet of the third ball valve 12 is connected to the inlet of the second flow meter 14. The outlet of the second flow meter 14 is connected to the inlet of the second relief valve 15. The outlet of the second relief valve 15 is connected to the oil tank 20. The first flow meter 8 tests the flow rate entering the pipeline explosion-proof valve 11, and the second flow meter 14 tests the flow rate exiting the pipeline explosion-proof valve 11. If the flow rate displayed by the second flow meter 14 is less than the flow rate of the first flow meter 8, it indicates that the pipeline explosion-proof valve 11 is leaking oil. Pressure gauge 6 displays the oil pressure of the hydraulic oil in the test circuit.

[0014] The inlet of the second ball valve 10 is connected to the pipeline between the first flow meter 8 and the first ball valve 9, and the outlet of the second ball valve 10 is connected to the pipeline between the explosion-proof valve 11 and the third ball valve 12; the inlet of the fourth ball valve 13 is connected to the pipeline between the first ball valve 9 and the explosion-proof valve 11, and the outlet of the fourth ball valve 13 is connected to the pipeline between the third ball valve 12 and the second flow meter 14.

[0015] The inlet of the first relief valve 3 is connected to the pipeline between the hydraulic pump 1 and the first flow meter 8, and the outlet of the first relief valve 3 is connected to the oil tank 20; the pressure gauge 6 and the pressure sensor 7 are both connected to the pipeline where the first relief valve 3 is located and are located between the outlet of the hydraulic pump 1 and the inlet of the first relief valve 3.

[0016] A fourth filter 19 is installed inside the tank 20, and the outlet of the fourth filter 19 is connected to the inlet of the hydraulic pump 1. The fourth filter 19 filters the hydraulic oil entering the hydraulic pump 1. The first filter 5 is connected to the pipeline where the outlet of the hydraulic pump 1 is located, and the first filter 5 filters the hydraulic oil entering the explosion-proof valve 11 in the pipeline. The second filter 16 is connected to the pipeline where the outlet of the second relief valve 15 is located, and the second filter 16 filters the hydraulic oil entering the tank 20 after the test is completed. The third filter 17 is connected to the pipeline where the outlet of the first relief valve 3 is located.

[0017] A fifth ball valve 18 is installed on the pipeline between the outlet of the fourth filter 19 and the inlet of the hydraulic pump 1. The fifth ball valve 18 controls the on / off state of the entire circuit. A check valve 4 is installed on the pipeline where the outlet of the hydraulic pump 1 is located. The check valve 4 is used to prevent hydraulic oil in the pipeline from flowing back into the hydraulic pump 1.

[0018] The basic working principle of a hydraulic pipeline explosion-proof valve is based on the imbalance between the pressure difference at the inlet and outlet and the spring force. When the flow rate in the pipeline exceeds the set value, the pressure difference between the inlet and outlet increases, overcoming the spring force and pushing the valve core to move, cutting off the oil circuit and preventing accidents. The hydraulic pipeline explosion-proof valve can only open after the pressure returns to normal. This utility model designs a test circuit based on the basic working principle and mechanical structure characteristics of the hydraulic pipeline explosion-proof valve.

[0019] like Figure 2 In the circuit shown, when the explosion-proof valve 11 is tested for shut-off (at which time the explosion-proof valve 11 is not shut off), the fifth ball valve 18, the first ball valve 9, and the third ball valve 12 are opened. The output oil from the hydraulic pump 1 flows sequentially through the check valve 4, the first filter 5, the first flow meter 8, the first ball valve 9, the inlet of the explosion-proof valve 11, the outlet of the explosion-proof valve 11, the third ball valve 12, the second flow meter 14, the second relief valve 15, and the second filter 16 into the oil tank 20. At this time, the second ball valve 10 and the fourth ball valve 13 are closed. When the flow rate through the explosion-proof valve 11 exceeds the specified value, the explosion-proof valve 11 will automatically shut off. At this time, to ensure system safety, the hydraulic oil at the outlet of the hydraulic pump 1 flows back to the oil tank sequentially through the check valve 4, the first filter 5, the first relief valve 3, and the third filter 17. The above circuit can be used to test whether the shut-off performance of the explosion-proof valve 11 is qualified.

[0020] like Figure 3In the circuit shown, the pipeline explosion-proof valve 11 is in the off state. The fifth ball valve 18 is opened, and the output oil from the hydraulic pump 1 sequentially passes through the check valve 4, the first filter 5, the first flow meter 8, the second ball valve 10, the outlet of the pipeline explosion-proof valve 11, the inlet of the pipeline explosion-proof valve 11, the fourth ball valve 13, the second flow meter 14, the second relief valve 15, and the second filter 16 before entering the oil tank 20. At this time, the first ball valve 9 and the third ball valve 12 are in the closed state. The entire test circuit is pressure-set through the first relief valve 3, and the inlet of the pipeline explosion-proof valve 11 is under high pressure. The high-pressure control oil, combined with the spring force, resets the pipeline explosion-proof valve 11 to its normal operating state, thus completing the reset test of the pipeline explosion-proof valve 11.

[0021] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A fast-switching test circuit for hydraulic valve testing, characterized in that, The system includes a hydraulic pump (1), a motor (2), a first relief valve (3), a pressure gauge (6), a pressure sensor (7), a first flow meter (8), a first ball valve (9), a second ball valve (10), a third ball valve (12), a fourth ball valve (13), a second flow meter (14), a second relief valve (15), and an oil tank (20). The inlet of the hydraulic pump (1) is connected to the oil tank (20). The motor (2) drives the hydraulic pump (1) to work, and the outlet of the hydraulic pump (1) is connected to the first flow meter (8). The outlet of the first flow meter (8) is connected to the inlet of the first ball valve (9), the outlet of the first ball valve (9) is connected to the inlet of the pipeline explosion-proof valve (11), the outlet of the pipeline explosion-proof valve (11) is connected to the inlet of the third ball valve (12), the outlet of the third ball valve (12) is connected to the inlet of the second flow meter (14), the outlet of the second flow meter (14) is connected to the inlet of the second relief valve (15), and the outlet of the second relief valve (15) is connected to the oil tank (20); the pipeline explosion-proof valve (11) is the valve under test; The inlet of the second ball valve (10) is connected to the pipeline between the first flow meter (8) and the first ball valve (9), and the outlet of the second ball valve (10) is connected to the pipeline between the pipeline explosion-proof valve (11) and the third ball valve (12); the inlet of the fourth ball valve (13) is connected to the pipeline between the first ball valve (9) and the pipeline explosion-proof valve (11), and the outlet of the fourth ball valve (13) is connected to the pipeline between the third ball valve (12) and the second flow meter (14); The inlet of the first relief valve (3) is connected to the pipeline between the hydraulic pump (1) and the first flow meter (8), and the outlet of the first relief valve (3) is connected to the oil tank (20); the pressure gauge (6) and the pressure sensor (7) are both connected to the pipeline where the first relief valve (3) is located and are located between the outlet of the hydraulic pump (1) and the inlet of the first relief valve (3); A fourth filter (19) is provided in the oil tank (20). The outlet of the fourth filter (19) is connected to the inlet of the hydraulic pump (1). The first filter (5) is connected to the pipeline where the outlet of the hydraulic pump (1) is located. A fifth ball valve (18) is provided on the pipeline between the outlet of the fourth filter (19) and the inlet of the hydraulic pump (1).

2. The fast-switching test circuit for hydraulic valve testing according to claim 1, characterized in that, The second filter (16) is connected to the pipeline where the outlet of the second relief valve (15) is located, and the third filter (17) is connected to the pipeline where the outlet of the first relief valve (3) is located.

3. The fast-switching test circuit for hydraulic valve testing according to claim 1, characterized in that, A check valve (4) is installed on the pipeline where the outlet of the hydraulic pump (1) is located.

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