Plug-in mounting type hydraulic control one-way valve testing device

Abstract

The utility model discloses a plug-in mounting type hydraulic control one-way valve testing device, and relates to the technical field of hydraulic testing. An oil path block, a transparent plastic pipe, a pressure reducing valve, a flow regulating valve, a reversing valve, a manual stop valve and an overflow valve are arranged on the mounting base, a digital display pressure sensor I and a digital display pressure sensor II are arranged on the outer side of the oil path block, the digital display pressure sensor I is communicated with the overflow valve, and a detection end of the digital display pressure sensor II is communicated with the pressure reducing valve. The first oil port is connected with a manual stop valve to achieve pressure supply of a pilot oil way, the fourth oil port controls a pressure maintaining oil way through a reversing valve, synchronous oil supply of double oil ways is supported, and the pressure is independently adjustable. Meanwhile, the arrangement of the pressure reducing valve and the flow regulating valve can change the limitation of the existing test bench, realizes the switching of different pressures and flows, and meets the performance detection of the special hydraulic control one-way valve. The digital display pressure sensor I monitors the pressure change of the oil port IV in real time; and the digital display pressure sensor II tracks the outlet pressure of the pressure reducing valve.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic testing technology, and in particular to a cartridge-type hydraulic control check valve testing device. Background Technology

[0002] Ordinary hydraulic check valves can only open in one direction, while pilot-operated check valves can open in the reverse direction after receiving a pilot control signal, allowing hydraulic oil to flow in the opposite direction. Once the pilot control signal is canceled, the reverse passage can be quickly closed. Pilot-operated check valves are widely used in hydraulic circuits where actuators need to be locked or maintain load. Threaded cartridge pilot-operated check valves, due to their compact structure and ease of integration, are widely used in engineering machinery. However, if the pilot-operated check valve has poor sealing quality and excessive internal leakage, the locking function will fail, causing the actuator to fail to lock, resulting in phenomena such as slow cylinder load reduction or hydraulic motor slippage, which can easily lead to production safety accidents. Therefore, these valves require comprehensive performance testing during product manufacturing, mainly including opening pressure, internal leakage during pressure holding, pressure drop, and closing hysteresis time after control signal cancellation.

[0003] However, there are many types of existing threaded cartridge hydraulic check valves. For some special-purpose hydraulic check valves, dedicated testing equipment is required. Some special hydraulic check valves have high requirements for testing. For example, during testing, the pilot port and the pressure holding port must be supplied with oil simultaneously, and pressure changes and pressure drop during reverse flow must be observed in real time under different pressures and flow rates, as well as leakage detection. Existing hydraulic valve testing equipment cannot meet these requirements due to its limited testing functions. Therefore, this application proposes a cartridge hydraulic check valve testing device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a cartridge-type hydraulic control check valve testing device, which solves the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a cartridge-type hydraulic control check valve testing device, comprising a mounting base, on which an oil passage block, a transparent plastic tube, a pressure reducing valve, a reversing valve, a manual shut-off valve, and an overflow valve are disposed. The mounting base has mounting holes one, two, and three. A fixing threaded hole is provided on the outer wall of the oil passage block. A fixing block is connected to the oil passage block through the fixing threaded hole. The fixing block is fixed to the mounting base through mounting hole one. The transparent plastic tube is fixed to the mounting base and communicates with mounting hole two. The pressure reducing valve is fixed to the mounting base through mounting hole three. The overflow valve has a return port, and the pressure reducing valve has an inlet port. A digital pressure sensor one and a digital pressure sensor two are disposed on the outer side of the oil passage block. A flow regulating valve is connected to the outer side of the reversing valve. The digital pressure sensor one is connected to the overflow valve. The detection end of the digital pressure sensor two is connected to the pressure reducing valve, and the pressure reducing valve is connected to the overflow valve.

[0006] Preferably, the upper end of the oil circuit block is provided with a test valve mounting hole, the lower end of the test valve mounting hole is provided with a first stepped hole, the lower end of the first stepped hole is provided with a second stepped hole, the lower end of the second stepped hole is provided with a third stepped hole, the lower end of the third stepped hole is provided with a fourth stepped hole, the side wall of the first stepped hole is provided with an oil port one and an oil port two, the side wall of the second stepped hole is provided with an oil port five, and the side wall of the fourth stepped hole is provided with an oil port three and an oil port four, and the oil port three and the oil port four are connected.

[0007] Preferably, oil port three is connected to digital display pressure sensor one, oil port four is connected to directional valve, oil port one is connected to manual shut-off valve, and the end of manual shut-off valve away from oil port one is connected to pressure reducing valve.

[0008] Preferably, a connecting pipe is connected to the oil return port, and the end of the connecting pipe away from the oil return port is connected to the reversing valve. The connecting pipe is also connected to the pressure reducing valve.

[0009] Preferably, the pressure reducing valve is a direct-acting pressure reducing valve, the relief valve is a direct-acting relief valve, the flow regulating valve is a needle valve type throttle valve, the manual shut-off valve is a ball valve, and the directional valve is a two-position three-way ball valve type directional valve.

[0010] Compared with related technologies, the cartridge-type hydraulic check valve testing device provided by this utility model has the following advantages:

[0011] 1. This utility model provides a cartridge-type hydraulic control check valve testing device. The pilot oil circuit is pressurized by connecting a manual shut-off valve through oil port one, and the pressure-holding oil circuit is controlled by a reversing valve through oil port four. It supports synchronous oil supply in two oil circuits and the pressure is independently adjustable. At the same time, the setting of pressure reducing valve and flow regulating valve can change the limitations of the existing test bench, realize the switching of different pressures and flow rates, and meet the performance testing of this special hydraulic control check valve.

[0012] 2. This utility model provides a cartridge-type hydraulic control check valve testing device. A digital display pressure sensor one monitors the pressure change at port four in real time, and a digital display pressure sensor two tracks the outlet pressure of the pressure reducing valve. The linkage between the direct-acting relief valve and the two-position three-way directional valve automatically unloads the valve body when the test pressure is over-pressured, preventing damage to the valve body.

[0013] Furthermore, this device is lightweight, has a compact and simple structure, and is low in cost. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the planar structure of the present invention;

[0016] Figure 3 This is a schematic diagram illustrating the principle of the device of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the mounting base of this utility model;

[0018] Figure 5 This is a schematic diagram of the cross-sectional structure of the oil passage block of this utility model.

[0019] In the diagram: 1. Mounting base; 2. Oil circuit block; 3. Pressure reducing valve; 4. Relief valve; 5. Manual shut-off valve; 6. Directional control valve; 7. Flow regulating valve; 8. Digital pressure sensor one; 9. Digital pressure sensor two; 10. Fixing block; 11. Transparent plastic tube; 12. Connecting pipe one; 13. Connecting pipe two; 14. Oil return port; 15. Oil inlet; 16. Existing hydraulic test bench; 17. Mounting hole one; 18. Mounting hole two; 19. Mounting hole three; 20. Test valve mounting hole; 21. Oil port one; 22. Oil port two; 23. First step hole; 24. Second step hole; 25. Third step hole; 26. Oil port three; 27. Oil port four; 28. Fourth step hole; 29. ​​Oil port five; 30. Fixing threaded hole; 31. Test pressure holding P1 oil port; 32. Test pilot P2 oil port. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-5 This utility model provides a technical solution: a cartridge-type hydraulic control check valve testing device, including a mounting base 1. The mounting base 1 is provided with an oil passage block 2, a transparent plastic tube 11, a pressure reducing valve 3, a reversing valve 6, a manual shut-off valve 5, and an overflow valve 4. The mounting base 1 has mounting holes 17, 18, and 19. A fixing threaded hole 30 is provided on the outer wall of the oil passage block 2. A fixing block 10 is connected to the oil passage block 2 through the fixing threaded hole 30. The fixing block 10 is fixed to the mounting base 1 through mounting hole 17. The transparent plastic tube 11 is fixed to the mounting base 1 and communicates with mounting hole 18. The pressure reducing valve 3 is fixed to the mounting base 1 through mounting hole 19. The overflow valve 4 is equipped with an oil return port 14, the pressure reducing valve 3 is equipped with an oil inlet 15, the outside of the oil circuit block 2 is equipped with a digital pressure sensor 1 8 and a digital pressure sensor 2 9, the outside of the reversing valve 6 is connected to a flow regulating valve 7, the digital pressure sensor 1 8 is connected to the overflow valve 4, the setting of the pressure reducing valve 3 and the flow regulating valve 7 can change the limitations of the existing test bench, realize the switching of different pressures and flow rates, and meet the performance testing of this special hydraulic control check valve. The end of the flow regulating valve 7 away from the reversing valve 6 is connected to a connecting pipe 2 13, the end of the connecting pipe 2 13 away from the flow regulating valve 7 is connected to the overflow valve 4, the detection end of the digital pressure sensor 2 9 is connected to the pressure reducing valve 3, and the pressure reducing valve 3 is connected to the overflow valve 4;

[0022] The upper end of the oil circuit block 2 is provided with a test valve mounting hole 20. The lower end of the test valve mounting hole 20 is provided with a first stepped hole 23, the lower end of the first stepped hole 23 is provided with a second stepped hole 24, the lower end of the second stepped hole 24 is provided with a third stepped hole 25, and the lower end of the third stepped hole 25 is provided with a fourth stepped hole 28. The side wall of the first stepped hole 23 has two oil ports: one 21 and two 22. The side wall of the second stepped hole 24 has one oil port 29. The side wall of the fourth stepped hole 28 has two oil ports: one 26 and one 27. Oil ports 26 and 27 are connected, and oil port 26 is connected to a digital pressure sensor. The device is connected to port 8, port 4 (27) is connected to the directional valve 6, port 1 (21) is connected to the manual shut-off valve 5, port 2 (22) is blocked with a plug (not shown in the schematic diagram), and the end of the manual shut-off valve 5 away from port 1 (21) is connected to the pressure reducing valve 3. During testing, the digital display pressure sensor 1 (8) monitors the pressure change at port 3 (26) in real time, i.e., the pressure change at port 4 (27), and the digital display pressure sensor 2 (9) tracks the outlet pressure of the pressure reducing valve 3. The pilot oil circuit is pressurized by connecting the manual shut-off valve 5 through port 1 (21), and the pressure holding oil circuit is controlled by the directional valve 6 through port 4 (27). It supports synchronous oil supply from two oil circuits and the pressure is independently adjustable.

[0023] A connecting pipe 12 is connected to the oil return port 14. The end of the connecting pipe 12 away from the oil return port 14 is connected to the reversing valve 6. The connecting pipe 12 is also connected to the pressure reducing valve 3.

[0024] Pressure reducing valve 3 is a direct-acting pressure reducing valve, relief valve 4 is a direct-acting relief valve, flow regulating valve 7 is a needle valve throttle valve, manual shut-off valve 5 is a ball valve, and directional valve 6 is a two-position three-way ball valve directional valve. The linkage between direct-acting relief valve 4 and two-position three-way directional valve 6 automatically unloads when the pressure is over-tested to prevent damage to the valve body.

[0025] The testing method for this device is as follows: First, set the pressure reducing valve 3 handle to set the test valve opening pressure to 2 MPa; set the flow regulating valve 7 to a flow rate of 3 L / min through the test device, and then test the test valve according to the following steps:

[0026] 1. Check if the handle of the reversing valve 6 is in the pressure relief position. The digital pressure sensor 8 displays 0 MPa.

[0027] 2. Check if the handle of the manual shut-off valve 5 is in the closed position; the digital pressure sensor 29 should display 2.0 MPa.

[0028] 3. Install the valve to be tested in the cavity of oil circuit block 2.

[0029] 4. Switch the reversing valve 6 to the open position and pressurize the valve under test. The digital pressure sensor will display 6 MPa (i.e., the system pressure of the test bench). Observe the transparent plastic tube 11. No flow (or droplets) should be seen in the transparent plastic tube 11.

[0030] 5. Switch the manual shut-off valve 5 to the open position. The flow rate displayed on the test bench is greater than 3 L / min, and the digital pressure sensor 29 displays less than 2 MPa.

[0031] 6. Repeat the closing and opening of the manual shut-off valve 5 three times to ensure that the valve under test opens smoothly.

[0032] 7. Switch the manual shut-off valve 5 to the closed position. The digital pressure sensor 8 immediately changes to the test bench system pressure of 6 MPa, and the leakage in the transparent plastic tube 11 must be less than 3 drops / minute.

[0033] 8. Move the handle of directional valve 6 to the pressure relief position. Check that the handle of manual shut-off valve 5 is also in the closed position; the digital pressure sensor 8 should display 0.

[0034] Working principle: During testing, the valve under test is connected to the hydraulic circuit block 2 through the test valve mounting hole 20. Port 21 is connected to the test pilot port 32 (P2) of the valve under test via the first step hole 23. Port 29 is connected to the leakage port (T) of the valve under test. The high-pressure oil output terminal of the existing hydraulic test bench 16 is connected to the inlet port 15. One path of the high-pressure oil enters the pilot oil circuit through the pressure reducing valve 3, then passes through the manual shut-off valve 5. The high-pressure oil then reaches port 21 at the top of the hydraulic circuit block 2. The pressure at the test pilot port (P2) after pressure reduction is displayed in real time using the digital pressure sensor 9. The other path is limited to 3 liters / minute by the flow regulating valve 7, then passes through the two-position three-way directional valve 6 (switch to the lower position) to reach port 27 at the bottom of the hydraulic circuit block 2, and finally reaches the test pressure holding port (P1) 31. The relief valve 4 is used to limit the pressure Ps from the general hydraulic test bench pump. The digital pressure sensor 8 displays the pressure P1 entering the test block. The initial state is that the manual shut-off valve 5 is closed, the directional valve 6 is in the T-port state, the digital pressure sensor 8 displays 0; the digital pressure sensor 9 displays the pressure after depressurization, which is required to be 2MPa, lower than the system pressure Ps (6MPa).

[0035] When the manual directional valve 6 is switched, pressurized oil from the system enters the test block, and the digital pressure sensor 8 displays the system pressure Ps (6MPa). At this time, there should be no oil flowing out of the test leakage port T, or the leakage should be minimal (less than 3 drops per minute). When the manual shut-off valve 5 is opened, the pilot oil source enters the test pilot port P2 through the upper oil port 21 of the test block, and the hydraulic control check valve under test opens in reverse. Oil flows out of the test leakage port T of the hydraulic control check valve under test. The digital pressure sensor 8 displays the pressure drop flowing through the valve under test at this time. The digital pressure sensor 9 displays the pilot opening pressure, which is slightly lower than the value displayed by the digital pressure sensor 9 before the manual shut-off valve 5 is opened.

[0036] When the manual shut-off valve 5 is closed, the digital pressure sensor 29 displays that the pressure has returned to the set value (2MPa), and the digital pressure sensor 8 displays that the pressure has returned to the system set value (6MPa). The pressure holding port P1 is used to perform a pressure holding test on the valve under test. The leak port T of the qualified test valve should no longer have oil flowing out or the leakage should be minimal (less than 3 drops per minute).

[0037] The digital pressure sensor 8 displays the system pressure Ps (6MPa); at this time, the directional valve 6 is switched, and the digital pressure sensor 8 immediately or after a very short time (less than one second) returns to 0.

[0038] If the output flow rate of the existing system is greater than the flow rate of the valve to be tested, it can be adjusted to match the required test flow rate through the flow regulating valve 7 on this device.

[0039] The overflow valve 4 of the test device is set to a pressure greater than that of the existing hydraulic test bench system, and is used as a safety valve.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cartridge-type hydraulic control check valve testing device, comprising a mounting base (1), characterized in that: The mounting base (1) is provided with an oil passage block (2), a transparent plastic tube (11), a pressure reducing valve (3), a reversing valve (6), a manual shut-off valve (5), and an overflow valve (4). The mounting base (1) has mounting holes one (17), two (18), and three (19). The outer side wall of the oil passage block (2) has a fixing threaded hole (30). The oil passage block (2) is connected to a fixing block (10) through the fixing threaded hole (30). The fixing block (10) is fixed to the mounting base (1) through the mounting hole one (17). The transparent plastic tube (11) is fixed to the mounting base (1). The plastic tube (11) is connected to the second mounting hole (18). The pressure reducing valve (3) is fixed on the mounting base (1) through the third mounting hole (19). The overflow valve (4) is provided with an oil return port (14). The pressure reducing valve (3) is provided with an oil inlet (15). The outside of the oil circuit block (2) is provided with a digital display pressure sensor one (8) and a digital display pressure sensor two (9). The outside of the reversing valve (6) is connected to a flow regulating valve (7). The digital display pressure sensor one (8) is connected to the overflow valve (4). The detection end of the digital display pressure sensor two (9) is connected to the pressure reducing valve (3). The pressure reducing valve (3) is connected to the overflow valve (4).

2. The cartridge-type hydraulic check valve testing device according to claim 1, characterized in that: The upper end of the oil circuit block (2) is provided with a test valve mounting hole (20), the lower end of the test valve mounting hole (20) is provided with a first step hole (23), the lower end of the first step hole (23) is provided with a second step hole (24), the lower end of the second step hole (24) is provided with a third step hole (25), the lower end of the third step hole (25) is provided with a fourth step hole (28), the side wall of the first step hole (23) is provided with an oil port one (21) and an oil port two (22), the side wall of the second step hole (24) is provided with an oil port five (29), the side wall of the fourth step hole (28) is provided with an oil port three (26) and an oil port four (27), and the oil port three (26) and the oil port four (27) are connected.

3. The cartridge-type hydraulic check valve testing device according to claim 2, characterized in that: The oil port three (26) is connected to the digital display pressure sensor one (8), the oil port four (27) is connected to the reversing valve (6), the oil port one (21) is connected to the manual shut-off valve (5), and the end of the manual shut-off valve (5) away from the oil port one (21) is connected to the pressure reducing valve.

4. The cartridge-type hydraulic check valve testing device according to claim 1, characterized in that: The return port (14) is connected to a connecting pipe (12), and the end of the connecting pipe (12) away from the return port (14) is connected to the reversing valve (6). The connecting pipe (12) is also connected to the pressure reducing valve (3).

5. The cartridge-type hydraulic check valve testing device according to claim 1, characterized in that: The pressure reducing valve (3) is a direct-acting pressure reducing valve, the relief valve (4) is a direct-acting relief valve, the flow regulating valve (7) is a needle valve throttle valve, the manual shut-off valve (5) is a ball valve, and the reversing valve (6) is a two-position three-way ball valve reversing valve.

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