Full-working-condition piston type energy accumulator sealing performance detection system

Abstract

The utility model relates to the technical field of energy accumulator sealing performance detection, and particularly discloses a full-condition piston type energy accumulator sealing performance detection system, which comprises an oil supply system and a test system, the oil supply system comprises an oil supply unit, a three-position four-way electromagnetic directional valve I and a proportional overflow valve, and the three-position four-way electromagnetic directional valve I and the proportional overflow valve are connected with the oil supply unit. The test system comprises an accompanying energy accumulator, a liquid column and an oil groove, the accompanying energy accumulator comprises a first liquid cavity and a second liquid cavity, a first oil way is arranged between the first liquid cavity of the accompanying energy accumulator and a first oil outlet of a three-position four-way electromagnetic directional valve I, the second liquid cavity is connected with the liquid column and the liquid cavity end of a test energy accumulator to be detected, and a second oil way is arranged between the first oil outlet of the three-position four-way electromagnetic directional valve II and the liquid cavity end of the test energy accumulator to be detected. A third stop valve is arranged on the first oil way, and a first stop valve is arranged on the oil way pipeline between the liquid column and the accompanying test energy accumulator. The detection system is simple to operate and good in universality, and can accurately and efficiently detect whether the tested energy accumulator has the problems of external air leakage and internal blow-by.

Description

Technical Field

[0001] The utility model belongs to the technical field of accumulator sealing performance detection, and particularly relates to a piston accumulator sealing performance detection system under all working conditions. Background Technique

[0002] Piston accumulators are widely used as emergency auxiliary oil sources for hydraulic systems in industries such as petrochemical and aviation. During their use, problems such as internal gas leakage and external air leakage often occur, resulting in a reduction in the functional characteristics of the accumulator or even the failure of the hydraulic system to operate. Therefore, the sealing performance of piston accumulators has received much attention during the research and development process. During their research and development, acceptance tests such as low-temperature sealing performance tests, low-temperature working cycle tests, high-temperature sealing performance tests, and high-temperature working cycle tests must be carried out to verify their sealing performance.

[0003] Currently, the existing piston accumulator sealing performance detection systems mainly consist of an environmental chamber, a low-temperature refrigeration system, a hydraulic oil source, manual valves, sensors, a control unit, etc. During the operation process, there are often problems such as the test environment being inconsistent with expectations, the test data being limited to the test system itself, being unable to accurately record the test data situation in the piston accumulator cavity, single test items, being unable to accurately test the internal gas leakage value of the piston accumulator, complex operation, low efficiency, poor versatility, and overly high equipment costs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a piston accumulator sealing performance detection system under all working conditions to solve the problems that the test environment of the existing accumulator sealing performance detection system is inconsistent with expectations, the system operation is complex, and the versatility is poor.

[0005] The utility model is realized through the following technical solutions:

[0006] A piston accumulator sealing performance detection system under all working conditions includes an oil supply system and a test system;

[0007] The oil supply system includes an oil supply unit, a three-position four-way electromagnetic directional control valve I connected to the oil supply unit, and a proportional relief valve. The proportional relief valve is used to adjust the pressure of the system between the oil supply unit and the test system;

[0008] The test system includes a companion accumulator, a liquid column, and an oil tank. The companion accumulator includes a first liquid chamber and a second liquid chamber. A first oil path is provided between the first liquid chamber of the companion accumulator and the first oil outlet of the three-position four-way electromagnetic directional control valve I. The second liquid chamber is respectively connected to the liquid column and the liquid chamber end of the test accumulator to be detected. A third stop valve is provided on the first oil path, and a first stop valve is provided on the oil pipeline between the liquid column and the companion accumulator.

[0009] In some embodiments, the test system further includes an environmental test chamber, and the accompanying energy accumulator and oil tank are both arranged in the environmental test chamber.

[0010] In some embodiments, a first temperature sensor and a first pressure sensor for detecting the temperature and pressure at the gas chamber end of the test energy accumulator are arranged inside the environmental test chamber, a second temperature sensor for detecting the internal temperature of the environmental test chamber is arranged on the environmental test chamber, and a second pressure sensor for detecting the pressure at the first liquid chamber inlet is arranged on the first oil path.

[0011] In some embodiments, a second oil path is arranged between the second oil outlet of the three-position four-way electromagnetic reversing valve I and the second liquid chamber outlet, and a second stop valve is arranged on the second oil path.

[0012] In some embodiments, the first stop valve, the second stop valve, and the third stop valve are all arranged outside the environmental test chamber.

[0013] In some embodiments, the oil supply system further includes a three-position four-way electromagnetic reversing valve II connected to the oil supply unit. One of the oil outlets of the three-position four-way electromagnetic reversing valve II is connected to the first oil path, and the other oil outlet is connected to the second oil path.

[0014] In some embodiments, the oil supply unit includes a fuel tank, an electric plunger pump, and a first one-way valve. One end of the electric plunger pump is connected to the fuel tank through an oil pipeline, and the other end is connected to the three-position four-way electromagnetic reversing valve I. One end of the proportional relief valve is connected between the three-position four-way electromagnetic reversing valve I and the electric plunger pump through an oil pipeline, and the other end is connected to the fuel tank through an oil pipeline.

[0015] In some embodiments, an oil cooling assembly is arranged between the three-position four-way electromagnetic reversing valve I and the oil supply unit, and the oil cooling assembly is used to cool the oil in the oil pipeline.

[0016] In some embodiments, the oil supply unit further includes a two-position two-way electromagnetic reversing valve I. One end of the two-position two-way electromagnetic reversing valve I is connected between the three-position four-way electromagnetic reversing valve I and the first one-way valve through an oil pipeline, and the other end is connected to the fuel tank. A third pressure sensor is arranged on the oil pipeline at the oil inlet end of the three-position four-way electromagnetic reversing valve I, and the third pressure sensor is used to detect the pressure at the oil inlet end of the three-position four-way electromagnetic reversing valve I.

[0017] In some embodiments, a control system is further included, and the control system is used to control the oil supply system.

[0018] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0019] 1. Connect the oil supply unit, the accompanying test accumulator, and the test accumulator to be tested. Immerse the test accumulator in the oil tank and supply oil to the test system through the oil supply unit, which can accurately detect the external sealing performance of the test accumulator. The proportional overflow valve can adjust the pressure of the oil supply unit and the test system, realizing the detection and analysis of the sealing performance of test accumulators with different structural dimensions and different rated working pressures. The set liquid column, test accumulator, and accompanying test accumulator form a pressure-holding system. After the test, by observing whether bubbles are generated in the liquid column and the change of the oil level scale in the liquid column, the internal sealing performance of the test accumulator can be accurately analyzed. This system is simple to operate and has good versatility, and can accurately and efficiently detect whether there are problems of external air leakage and internal gas leakage in the test accumulator.

[0020] 2. Set all the stop valves outside the environmental test chamber. During the test, there is no need to open the environmental test chamber to open and close the stop valves, realizing the full-condition environment simulation during the operation of the test accumulator, and the test process is safe and reliable.

[0021] 3. Set multiple temperature sensors and pressure sensors to monitor the test process. Obtain the monitoring data through the control system and display it on the human-machine interface in real time. The test phenomena and test data during the test process can be recorded, realizing the comparative analysis of test phenomena and test data. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the detection system in the embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the connection between the control system and the detection system in the embodiment of the present invention.

[0025] Wherein: 1 - oil level sensor, 2 - fuel tank, 3 - electric plunger pump, 4 - filter, 5 - first one-way valve, 6 - proportional overflow valve, 7 - oil cooling component, 8 - second one-way valve, 9 - two-position two-way electromagnetic reversing valve I, 10 - three-position four-way electromagnetic reversing valve II, 11 - three-position four-way electromagnetic reversing valve I, 12 - third stop valve, 13 - second pressure sensor, 14 - second stop valve, 15 - liquid column, 16 - first stop valve, 17 - fourth stop valve, 18 - environmental test chamber, 19 - second temperature sensor, 20 - accompanying test accumulator, 201 - second liquid chamber, 202 - first liquid chamber, 21 - test accumulator, 211 - gas chamber end, 212 - liquid chamber end, 22 - first temperature sensor, 23 - first pressure sensor, 24 - third temperature sensor, 25 - third pressure sensor, 26 - control system, 27 - control circuit, 28 - fifth stop valve, 29 - compressor, 30 - two-position two-way electromagnetic reversing valve II, 31 - man-machine interface. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0027] Embodiment 1

[0028] Referring to Figure 1 , a piston accumulator sealing performance detection system under all working conditions, comprising an oil supply system and a test system;

[0029] The oil supply system includes an oil supply unit, a three-position four-way electromagnetic reversing valve I connected to the oil supply unit, and a proportional overflow valve, and the proportional overflow valve is used to adjust the pressure of the system of the oil supply unit and the test system;

[0030] The test system includes an accompanying test accumulator, a liquid column, and an oil tank. The accompanying test accumulator includes a first liquid chamber and a second liquid chamber. A first oil circuit is provided between the first liquid chamber of the accompanying test accumulator and the first oil outlet of the three-position four-way electromagnetic reversing valve I. The second liquid chamber is respectively connected to the liquid column and the liquid chamber end of the test accumulator to be detected. A third stop valve is provided on the first oil circuit, and a first stop valve is provided on the oil pipeline between the liquid column and the accompanying test accumulator.

[0031] Referring to Figures 1 to 2, the detection system further includes a control system 26. The control system 26 is connected to the human-machine interaction interface 31. The control system 26 obtains the monitoring data through the control line 27 and displays it on the human-machine interaction interface 31 in real time. The test phenomena and test data during the test can be recorded, realizing the comparative analysis of the test phenomena and test data. After the test is completed, the valve is closed, the oil pipeline of the accumulator is disconnected, and the data is sorted out.

[0032] The detection system connects the oil supply unit, the accompanying test accumulator 20 and the test accumulator 21 to be detected. The test accumulator 21 is immersed in the oil tank, and the oil supply unit supplies oil to the test system, which can accurately detect the external sealing performance of the test accumulator 21; the proportional overflow valve 6 can adjust the pressure of the oil supply unit and the test system, realizing the detection and analysis of the sealing performance of the test accumulator 21 under different structural dimensions and different rated working pressures; the set liquid column 15, test accumulator 21 and accompanying test accumulator 20 form a pressure-holding system. After the test is completed, by observing whether bubbles are generated in the liquid column 15 and the change of the oil level scale in the liquid column 15, the internal sealing performance of the test accumulator 21 can be accurately analyzed; the system has simple operation and good versatility, and can accurately and efficiently detect whether there are problems of external air leakage and internal gas leakage in the test accumulator 21.

[0033] In some embodiments, as Figure 1 shown, the inlet of the liquid column 15 is connected to the oil tank 2 through an oil pipeline. A fourth stop valve 17 is provided on the oil pipeline between the inlet of the liquid column 15 and the oil tank 2, for allowing the excess oil in the liquid column 15 to flow back into the oil tank 2.

[0034] Embodiment 2

[0035] A second oil pipeline is provided between the second oil outlet of the three-position four-way electromagnetic directional valve I 11 and the outlet of the second liquid cavity 201, and a second stop valve 14 is provided on the second oil pipeline.

[0036] As Figures 1 to 2 shown, the test system further includes an environmental test chamber 18. The accompanying test accumulator 20 and the oil tank are both arranged in the environmental test chamber 18. A first temperature sensor 22 and a first pressure sensor 23 for detecting the temperature and pressure of the gas chamber end 211 of the test accumulator 21 are arranged in the environmental test chamber 18. A second temperature sensor 19 for detecting the internal temperature of the environmental test chamber 18 is arranged on the environmental test chamber 18, and a second pressure sensor 13 for detecting the inlet pressure of the first liquid cavity 202 is arranged on the first oil pipeline.

[0037] The first stop valve 16, the second stop valve 14, and the third stop valve 12 are all arranged outside the environmental test chamber 18; during the test process, there is no need to open the environmental test chamber 18 to open and close the stop valves, realizing the full-condition environmental simulation during the operation of the test accumulator 21, and the test process is safe and reliable.

[0038] Embodiment 3

[0039] As Figure 1 shown, the oil supply system further includes a three-position four-way solenoid directional control valve II 10 connected to the oil supply unit. One oil outlet of the three-position four-way solenoid directional control valve II 10 is connected to the first oil circuit, and the other oil outlet is connected to the second oil circuit.

[0040] The three-position four-way solenoid directional control valve II 10 serves as a standby directional control valve for the detection system, improving the reliability of the system.

[0041] The oil supply unit includes an oil tank 2, an electric plunger pump 3, and a first check valve 5. One end of the electric plunger pump 3 is connected to the oil tank 2 through an oil pipeline, and the other end is connected to the three-position four-way solenoid directional control valve I 11. One end of the proportional relief valve 6 is connected between the three-position four-way solenoid directional control valve I 11 and the electric plunger pump 3 through an oil pipeline, and the other end is connected to the oil tank 2 through an oil pipeline. The first check valve 5 is arranged on the oil pipeline between the electric plunger pump 3 and the three-position four-way solenoid directional control valve I 11, which can prevent the hydraulic oil of the detection system from flowing back into the electric plunger pump 3 and causing damage to the electric plunger pump 3.

[0042] An oil cooling component 7 is arranged between the three-position four-way solenoid directional control valve I 11 and the oil supply unit. The oil cooling component 7 is used to cool the oil in the oil pipeline. The oil cooling component 7 includes a refrigeration box, a refrigeration mechanism, and an oil cooling channel. The oil cooling channel is arranged in a spiral shape in the refrigeration box. The refrigeration mechanism includes a compressor 29, a fifth stop valve 28, and a two-position two-way solenoid directional control valve II 30. The compressor 29 is used for refrigeration. Both the fifth stop valve 28 and the two-position two-way solenoid directional control valve II 30 are connected to the control system 26. The control system 26 controls the opening and closing of the fifth stop valve 28 and the two-position two-way solenoid directional control valve II 30 through a control line 27, and can realize the opening and closing of the refrigeration mechanism.

[0043] The oil supply unit further includes a two-position two-way electromagnetic directional valve I9. One end of the two-position two-way electromagnetic directional valve I9 is connected between the three-position four-way electromagnetic directional valve I11 and the first check valve 5 through an oil pipeline, and the other end is connected to the fuel tank 2. A third pressure sensor 25 is provided on the oil pipeline at the oil inlet end of the three-position four-way electromagnetic directional valve I11, and the third pressure sensor 25 is used to detect the pressure at the oil inlet end of the three-position four-way electromagnetic directional valve I11. Both the third pressure sensor 25 and the two-position two-way electromagnetic directional valve I9 are connected to the control system 26 through a control line 27; when the third pressure sensor 25 detects that the pressure at the oil inlet end of the three-position four-way electromagnetic directional valve I11 exceeds the pressure value set by the proportional relief valve 6, the oil flows directly back to the fuel tank 2 through the two-position two-way electromagnetic directional valve I9.

[0044] In some embodiments, a filter 4 is provided on the oil pipeline between the electric plunger pump 3 and the fuel tank 2, and the filter 4 is used to remove impurities in the oil to avoid clogging the oil pipeline.

[0045] In some embodiments, an oil level sensor 1 is provided on the fuel tank 2. The oil level sensor 1 is connected to the control system 26 through a control line 27. The oil level sensor 1 is used to detect the oil level height in the fuel tank 2. When the oil level sensor 1 detects that the oil in the fuel tank 2 is too low, the control system 26 controls the electric plunger pump 3 to cut off the power supply, and the oil supply unit stops supplying oil.

[0046] Embodiment 4

[0047] As Figure 1 shown, a third temperature sensor 24 is further provided on the oil pipeline at the oil inlet end of the three-position four-way electromagnetic directional valve I11. The third temperature sensor 24 is connected to the control system 26 through a control line 27, and the third temperature sensor 24 is used to detect the temperature data at the oil inlet end of the three-position four-way electromagnetic directional valve I11.

[0048] In some embodiments, a second check valve 8 is provided on the oil pipeline between the two-position two-way electromagnetic directional valve I9 and the fuel tank 2, which can prevent the oil in the fuel tank 2 from flowing back into the oil cooling component 7 through the two-position two-way electromagnetic directional valve I9.

[0049] The detection method includes steps for detecting the sealing performance, including:

[0050] S11. Adjust the unloading pressure of the proportional relief valve 6 to the rated working pressure of the test accumulator 21, supply oil to the test system through the oil supply unit and the first oil circuit, and maintain for a first set time;

[0051] S12. Release the pressure of the oil supply unit on the test system through the three-position four-way electromagnetic directional valve I11, and maintain for a second set time;

[0052] S13. Repeat steps S11 and S12 three times in total and observe whether there are bubbles emerging in the oil tank;

[0053] S14. After completely relieving the pressure of the oil supply unit on the test system, slowly open the first shut-off valve 16, observe whether there are bubbles emerging in the liquid column 15, and obtain the current scale of the oil in the liquid column 15 after the oil in the liquid column 15 stabilizes.

[0054] In some embodiments, the first set time is 30 minutes.

[0055] In some embodiments, the second set time is 5 minutes.

[0056] Before the step of detecting the sealing performance, there is also a step of installation and debugging, including:

[0057] S21. Adjust the unloading pressure of the proportional relief valve 6 to the first preset pressure, close the first shut-off valve 16 and the third shut-off valve 12, open the second shut-off valve 14, and supply oil to the test system through the oil supply unit and the second oil circuit;

[0058] S22. Check whether there is any oil leakage in the oil pipeline.

[0059] In some embodiments, the first preset pressure is less than the pressure when the test accumulator 21 operates at rated working pressure.

[0060] Before the step of detecting the sealing performance, there is also a step of exhausting the detection system, including:

[0061] S31. Adjust the unloading pressure of the proportional relief valve 6 to be greater than the pre-set inflation pressure of the test accumulator 21;

[0062] S32. Close the first shut-off valve 16, and open the second shut-off valve 14 and the third shut-off valve 12;

[0063] S33. The oil supply unit supplies oil to the test system, and the YA1 end and the YA2 end of the three-position four-way electromagnetic directional valve Ⅰ 11 are alternately energized;

[0064] S34. Keep the YA2 end of the three-position four-way electromagnetic directional valve Ⅰ 11 energized, close the second shut-off valve 14, and slowly open the first shut-off valve 16;

[0065] S35. Observe the rising situation of the oil in the liquid column 15. If there are bubbles in the liquid column 15, repeat steps S32 to S34 until there are no bubbles emerging in the liquid column 15, and stop the oil supply unit from continuing to supply oil.

[0066] Before the step of detecting the sealing performance, there is also a step of simulating the ambient temperature, including:

[0067] S41. Open the first shut-off valve 16, close the second shut-off valve 14, and adjust the temperature of the environmental test chamber 18 to the set temperature.

[0068] S42. Detect the values of the first temperature sensor 22 and the second temperature sensor 19. When the values of the first temperature sensor 22 and the second temperature sensor 19 are close to the temperature of the environmental test chamber 18, close the first shut-off valve 16.

[0069] S43. Obtain the values of the first temperature sensor 22 and the second temperature sensor 19, and obtain the current scale of the oil in the liquid column 15.

[0070] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0071] In addition, when the terms "horizontal" and "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0072] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0073] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification and equivalent change made to the above embodiments based on the technical essence of the present invention all fall within the protection scope of the present invention.

Claims

1. A piston accumulator sealing performance detection system under all working conditions, characterized in that It includes an oil supply system and a test system; The oil supply system includes an oil supply unit, a three-position four-way electromagnetic directional valve I (11) connected to the oil supply unit, and a proportional relief valve (6). The proportional relief valve (6) is used to adjust the pressure of the system of the oil supply unit and the test system; The test system includes a companion accumulator (20), a liquid column (15) and an oil tank. The companion accumulator (20) includes a first liquid chamber (202) and a second liquid chamber (201). A first oil path is provided between the first liquid chamber (202) of the companion accumulator (20) and the first oil outlet of the three-position four-way electromagnetic directional valve I (11). The second liquid chamber (201) is respectively connected to the liquid column (15) and the liquid chamber end (212) of the test accumulator (21) to be detected. A third stop valve (12) is provided on the first oil path, and a first stop valve (16) is provided on the oil pipeline between the liquid column (15) and the companion accumulator (20).

2. The sealing performance detection system of a piston accumulator under all working conditions according to claim 1, wherein The test system further includes an environmental test chamber (18). The companion accumulator (20) and the oil tank are both arranged in the environmental test chamber (18).

3. The sealing performance detection system for a piston accumulator under all operating conditions according to claim 2, characterized in that A first temperature sensor (22) and a first pressure sensor (23) for detecting the temperature and pressure of the gas chamber end (211) of the test accumulator (21) are arranged in the environmental test chamber (18). A second temperature sensor (19) for detecting the internal temperature of the environmental test chamber (18) is arranged on the environmental test chamber (18). A second pressure sensor (13) for detecting the inlet pressure of the first liquid chamber (202) is arranged on the first oil path.

4. A full-condition piston accumulator sealing performance detection system according to claim 2, characterized in that, A second oil path is provided between the second oil outlet of the three-position four-way electromagnetic directional valve I (11) and the outlet of the second liquid chamber (201), and a second stop valve (14) is provided on the second oil path.

5. The sealing performance detection system of a piston accumulator under all working conditions according to claim 4, characterized in that, The first stop valve (16), the second stop valve (14) and the third stop valve (12) are all arranged outside the environmental test chamber (18).

6. The sealing performance detection system for a piston accumulator under all working conditions according to claim 4, characterized in that The oil supply system further includes a three-position four-way electromagnetic directional valve II (10) connected to the oil supply unit. One of the oil outlets of the three-position four-way electromagnetic directional valve II (10) is connected to the first oil path, and the other oil outlet is connected to the second oil path.

7. A sealing performance detection system for a piston accumulator under all operating conditions according to claim 1, characterized in that, The oil supply unit includes an oil tank (2), an electric plunger pump (3) and a first check valve (5). One end of the electric plunger pump (3) is connected to the oil tank (2) through an oil pipeline, and the other end is connected to the three-position four-way electromagnetic directional valve I (11). One end of the proportional relief valve (6) is connected to the three-position four-way electromagnetic directional valve I (11) and the electric plunger pump (3) through an oil pipeline, and the other end is connected to the oil tank (2) through an oil pipeline.

8. A full-condition piston accumulator sealing performance detection system according to claim 1, characterized in that An oil cooling assembly (7) is provided between the three-position four-way electromagnetic directional valve I (11) and the oil supply unit. The oil cooling assembly (7) is used to cool the oil in the oil pipeline.

9. The sealing performance detection system of a piston accumulator under all working conditions according to claim 7, wherein, The oil supply unit further includes a two-position two-way electromagnetic change-over valve I (9). One end of the two-position two-way electromagnetic change-over valve I (9) is connected between a three-position four-way electromagnetic change-over valve I (11) and a first check valve (5) through an oil pipeline, and the other end is connected to an oil tank (2). A third pressure sensor (25) is provided on the oil pipeline at one end of the oil inlet of the three-position four-way electromagnetic change-over valve I (11), and the third pressure sensor (25) is used for detecting the pressure at one end of the oil inlet of the three-position four-way electromagnetic change-over valve I (11).

10. A full-condition piston accumulator sealing performance detection system according to claim 1, characterized in that, It further includes a control system (26), and the control system (26) is used for controlling the oil supply system.

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