Water hydraulic cylinder impact leakage detection test bench based on helium detection

Abstract

A water hydraulic cylinder impact leakage detection test bench based on helium detection, the test bench comprising a test bench body, a water hydraulic cylinder (12), a helium cylinder (14), a sealed container (16) and an impact device, wherein the water hydraulic cylinder (12) is detachably mounted on the test bench body; an outlet end of the helium cylinder (14) is in communication with a rodless cavity of the water hydraulic cylinder (12), and a pressure-reducing valve (13) is mounted between the helium cylinder (14) and the water hydraulic cylinder (12); the sealed container (16) is detachably mounted in a rod cavity of the water hydraulic cylinder (12), and a helium mass spectrometer leak detector (15) is mounted on the sealed container (16); and the impact device is fixedly mounted on the test bench body, is connected to a piston rod of the water hydraulic cylinder (12), and is configured to provide impact power for the water hydraulic cylinder (12). The test bench uses an accumulator (6) as a pressure power source, which can provide rapid, stable and high-flow oil, thereby solving the problem of the pressure and flow of ordinary hydraulic pumps failing to meet test requirements; and compared with traditional impact generation by using hammer dropping, the test bench can precisely control the magnitude of the generated impact by means of the pressure of the accumulator (6), and is safe and reliable.

Description

A water hydraulic cylinder impact leakage detection test bench based on helium detection Technical Field

[0001] The present invention relates to the technical field of test devices, in particular to a water hydraulic cylinder impact leakage detection test bench based on helium detection. Background Art

[0002] Water hydraulics, a hydraulic transmission technology that uses water as the working medium, boasts environmentally friendly advantages. It has broad application prospects in environmentally conscious sectors such as food, beverages, medicine, electronics, and packaging, as well as in high-temperature, open-flame environments such as metallurgy, hot rolling, and casting, and in the research of high-pressure, high-flow water hydraulic components for mining.

[0003] The development of water hydraulic technology dates back over 200 years, beginning with the US military's research into underwater tools in the 1960s. In my country, universities and research institutes have been conducting research on water hydraulic transmission technology since the early 1980s.

[0004] During the development of hydraulic technology, hydraulic oil's flammability and pollution were two serious drawbacks, making it difficult to promote and apply hydraulic transmission in industries such as food, beverages, medicine, electronics, and packaging. Furthermore, it gradually lost its advantages in high-temperature, open-flame environments such as metallurgy, hot rolling, and casting, as well as in flammable and explosive environments such as underground coal mines. Therefore, the emergence of water hydraulics was of great significance in addressing these shortcomings.

[0005] Since water has a low viscosity, it will have a large impact on the hydraulic cylinder and other components, so it is necessary to detect hydraulic cylinder leakage under impact conditions. Existing test impact devices mainly use drop hammer impact loading test, accumulator rapid loading test system, blasting impact loading test system, etc. The drop hammer impact loading test system can better simulate the actual working conditions, but the pressure signal of the heavy object cannot be accurately controlled, which is not conducive to the acquisition of experimental data. The instability of the blasting impact loading test system leads to poor controllability of the pressure signal. The accumulator rapid loading test system has the advantages of fast loading speed, high economy, easy data acquisition and high controllability.

[0006] Traditional methods for testing the leaks in hydraulic cylinders often include the water bubble method, the smear method, and the pressure gauge method. However, these methods suffer from drawbacks such as cumbersome operation, low precision, and susceptibility to environmental interference. To meet the demand for higher precision and efficiency, helium testing has gradually been introduced for hydraulic cylinder leak testing. Helium testing offers advantages such as high sensitivity, fast detection speed, and non-contact operation. It uses helium as a tracer gas and performs leak tests on hydraulic cylinders using specialized testing equipment. When a hydraulic cylinder leaks, the helium rapidly diffuses into the surrounding environment, where it is captured by the testing equipment and the amount of leakage is measured. Through comparative analysis, the hydraulic cylinder's leak performance can be determined.

[0007] The traditional helium testing method involves filling a hydraulic cylinder with helium and placing it in a sealed cavity. The helium content within this sealed container is then measured to verify the cylinder's leak-tightness. However, placing the entire test bench inside a sealed container makes impact testing difficult, the sealed cavity is too large and inconvenient, and the test is easily affected by other factors within the cavity. Placing only the hydraulic cylinder under test in a sealed container while placing the impact source outside the container can make sealing difficult, leading to inaccurate results. Therefore, a test bench was designed to test the leak-tightness of water hydraulic cylinders under impact conditions.

[0008] Summary of the Invention

[0009] The purpose of the present invention is to provide a water hydraulic cylinder impact leakage detection test bench based on helium detection to solve the problems existing in the above-mentioned prior art.

[0010] To achieve the above objectives, the present invention provides a water hydraulic cylinder impact leakage detection test bench based on helium detection, comprising:

[0011] Test bench body;

[0012] A water hydraulic cylinder, which is detachably mounted on the test bench body;

[0013] a helium cylinder, wherein the outlet end of the helium cylinder is in communication with the rodless chamber of the water hydraulic cylinder, and a pressure reducing valve is installed between the helium cylinder and the water hydraulic cylinder;

[0014] A sealed container, the sealed container being detachably mounted on the rod chamber of the water hydraulic cylinder, and a helium mass spectrometer leak detector being mounted on the sealed container;

[0015] An impact device is fixedly mounted on the test bench body and connected to the piston rod of the water hydraulic cylinder. The impact device is used to provide impact power for the water hydraulic cylinder.

[0016] Preferably, the impact device comprises:

[0017] tank;

[0018] An oil hydraulic cylinder, the oil hydraulic cylinder being detachably mounted on the test bench body, the piston rod of the oil hydraulic cylinder being connected to the piston rod of the water hydraulic cylinder;

[0019] A second hydraulic pump, the inlet end of the second hydraulic pump being connected to the oil tank, the outlet end of the second hydraulic pump being sequentially provided with a first check valve and a two-position three-way solenoid reversing valve, one interface of the two-position three-way solenoid reversing valve being connected to the rod chamber of the oil hydraulic cylinder, and the other interface of the two-position three-way solenoid reversing valve being connected to the oil tank;

[0020] an accumulator, the accumulator being in communication with the rodless chamber of the oil hydraulic cylinder, the accumulator being used to impact the water hydraulic cylinder through the oil hydraulic cylinder;

[0021] A boosting mechanism, one end of which is connected to the oil tank, and the other end of which is connected to the accumulator, and the boosting mechanism is used to boost the pressure of the accumulator.

[0022] Preferably, the boosting mechanism includes:

[0023] A booster cylinder, wherein a large piston and a small piston are provided in the booster cylinder, the large piston and the small piston are coaxially fixed via a connecting shaft, the small piston end of the booster cylinder is in communication with the accumulator, and the small piston end of the booster cylinder is in communication with the oil tank; a third one-way valve is installed between the booster cylinder and the accumulator, and a second one-way valve is installed between the booster cylinder and the oil tank;

[0024] Hydraulic pump 1, the inlet end of the hydraulic pump 1 is connected to the oil tank, the outlet end of the hydraulic pump 1 is connected to a three-position four-way solenoid valve, the two interfaces of the three-position four-way solenoid valve are respectively connected to the two sides of the large piston of the booster cylinder, and the last interface of the three-position four-way solenoid valve is connected to the oil tank.

[0025] Preferably, a relief valve 1 is provided between the oil tank and the three-position four-way solenoid valve, and the relief valve 1 is provided in parallel with the hydraulic pump 1.

[0026] Preferably, a second overflow valve is provided between the oil tank and the two-position three-way electromagnetic reversing valve, and the second overflow valve is provided in parallel with the second hydraulic pump.

[0027] Preferably, a pressure gauge is installed on the pipeline between the accumulator and the oil hydraulic cylinder.

[0028] Preferably, the impact device further comprises:

[0029] A pressure relief circuit is arranged in parallel with the boosting mechanism, one end of the pressure relief circuit is connected between the accumulator and the oil hydraulic cylinder, and the other end of the pressure relief circuit is connected between the hydraulic pump 2 and the oil tank.

[0030] Preferably, the pressure relief circuit includes a stop valve and a third overflow valve installed on the pipeline, and the stop valve and the third overflow valve are arranged in parallel.

[0031] Preferably, the sealed container is threadedly connected to the water hydraulic cylinder, and an O-ring is provided between the sealed container and the water hydraulic cylinder; the helium mass spectrometer leak detector is detachably mounted in the helium detection port of the sealed container.

[0032] Preferably, a sleeve is provided between the piston rod of the oil hydraulic cylinder and the piston rod of the water hydraulic cylinder, and both ends of the sleeve are interference fit with the piston rod of the oil hydraulic cylinder and the piston rod of the water hydraulic cylinder respectively.

[0033] Compared with the prior art, the present invention has the following advantages and technical effects:

[0034] 1. The present invention uses an accumulator as a pressure power source, which can provide rapid, stable and large-flow oil, thereby solving the problem that the pressure and flow of ordinary hydraulic pumps do not meet the test requirements and ensuring the stability of the test process. Compared with the traditional method of using a falling hammer to generate impact, the present invention can accurately control the size of the impact through the pressure of the accumulator, which is safe and reliable.

[0035] 2. The impact range that the present invention can produce is relatively large. When a large impact occurs, it is safe and reliable to use helium as the detection gas, and no explosion will occur when a large impact is generated. Moreover, the helium detection range is relatively large. For small leaks, the use of helium as the detection gas will not block the small leak holes, and it can diffuse quickly, so it can detect hydraulic cylinders with small leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] FIG1 is a schematic diagram of a water hydraulic cylinder impact leakage detection test bench based on helium detection according to the present invention;

[0038] FIG2 is a schematic diagram showing the connection between the sealed container and the water hydraulic cylinder of the present invention;

[0039] FIG3 is a schematic structural diagram of the test bench body of the present invention;

[0040] In the figure: 1. Oil tank; 2. Hydraulic pump 1; 3. Overflow valve 1; 4. Three-position four-way solenoid valve; 5. Booster cylinder; 6. Accumulator; 7. Pressure gauge; 8. Oil hydraulic cylinder; 9. Piston rod; 10. Sleeve; 11. Piston rod; 12. Water hydraulic cylinder; 13. Pressure reducing valve; 14. Helium cylinder; 15. Helium mass spectrometer leak detector; 16. Sealed container; 17. Overflow valve 2; 18. Two-position three-way solenoid directional valve; 19. One-way valve 1; 20. Stop valve; 21. Hydraulic pump 2; 22. Overflow valve 3; 23. One-way valve 2; 24. One-way valve 3; 25. O-ring; 26. Helium detection port. DETAILED DESCRIPTION

[0041] It should be noted that, unless there is a conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other. The embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0042] The present invention provides a water hydraulic cylinder impact leakage detection test bench based on helium detection, comprising:

[0043] Test bench body;

[0044] A water hydraulic cylinder 12, which is detachably mounted on the test bench body;

[0045] a helium cylinder 14 , wherein the outlet end of the helium cylinder 14 is in communication with the rodless chamber of the water hydraulic cylinder 12 , and a pressure reducing valve 13 is installed between the helium cylinder 14 and the water hydraulic cylinder 12 ;

[0046] A sealed container 16 , which is detachably mounted on the rod chamber of the water hydraulic cylinder 12 , and a helium mass spectrometer leak detector 15 is mounted on the sealed container 16 ;

[0047] An impact device is fixedly mounted on the test bench body and connected to the piston rod of the water hydraulic cylinder 12 . The impact device is used to provide impact power to the water hydraulic cylinder 12 .

[0048] Furthermore, the impact device includes:

[0049] Fuel tank 1;

[0050] An oil hydraulic cylinder 8, which is detachably mounted on the test bench body, and whose piston rod is connected to the piston rod of the water hydraulic cylinder 12;

[0051] A second hydraulic pump 21, the inlet end of the second hydraulic pump 21 is connected to the oil tank 1, and the outlet end of the second hydraulic pump 21 is sequentially installed with a one-way valve 19 and a two-position three-way electromagnetic reversing valve 18, one interface of the two-position three-way electromagnetic reversing valve 18 is connected to the rod chamber of the oil hydraulic cylinder 8, and the other interface of the two-position three-way electromagnetic reversing valve 18 is connected to the oil tank 1;

[0052] an accumulator 6 , the accumulator 6 being in communication with the rodless chamber of the oil hydraulic cylinder 8 , the accumulator 6 being used to impact the water hydraulic cylinder 12 through the oil hydraulic cylinder 8 ;

[0053] A boosting mechanism, one end of which is connected to the oil tank 1 , and the other end of which is connected to the accumulator 6 , and the boosting mechanism is used to boost the pressure of the accumulator 6 .

[0054] Furthermore, the boosting mechanism includes:

[0055] A booster cylinder 5 is provided with a large piston and a small piston therein. The large piston and the small piston are coaxially fixed to each other via a connecting shaft. The small piston end of the booster cylinder 5 is in communication with the accumulator 6, and the small piston end of the booster cylinder 5 is in communication with the fuel tank 1. A third one-way valve 24 is installed between the booster cylinder 5 and the accumulator 6, and a second one-way valve 23 is installed between the booster cylinder 5 and the fuel tank 1.

[0056] Hydraulic pump 2, the inlet end of the hydraulic pump 2 is connected to the oil tank 1, and the outlet end of the hydraulic pump 2 is connected to a three-position four-way solenoid valve 4. The two-way interfaces of the three-position four-way solenoid valve 4 are respectively connected to the two sides of the large piston of the booster cylinder 5, and the last interface of the three-position four-way solenoid valve 4 is connected to the oil tank 1.

[0057] Furthermore, an overflow valve 3 is provided between the oil tank 1 and the three-position four-way solenoid valve 4 , and the overflow valve 3 is provided in parallel with the hydraulic pump 2 .

[0058] Furthermore, a second overflow valve 17 is provided between the oil tank 1 and the two-position three-way electromagnetic reversing valve 18 , and the second overflow valve 17 is provided in parallel with the second hydraulic pump 21 .

[0059] Furthermore, a pressure gauge 7 is installed on the pipeline between the accumulator 6 and the oil hydraulic cylinder 8.

[0060] Furthermore, the impact device further comprises:

[0061] A pressure relief circuit is arranged in parallel with the boosting mechanism, one end of the pressure relief circuit is connected between the accumulator 6 and the oil hydraulic cylinder 8, and the other end of the pressure relief circuit is connected between the hydraulic pump 21 and the oil tank 1.

[0062] Furthermore, the pressure relief circuit includes a stop valve 20 and a relief valve 22 installed on the pipeline, and the stop valve 20 and the relief valve 22 are arranged in parallel.

[0063] Furthermore, the sealed container 16 is threadedly connected to the water hydraulic cylinder 12 , and an O-ring 25 is provided between the sealed container 16 and the water hydraulic cylinder 12 ; the helium mass spectrometer leak detector 15 is detachably installed in the helium detection port 26 of the sealed container 16 .

[0064] Furthermore, a sleeve 10 is provided between the piston rod 9 of the oil hydraulic cylinder 8 and the piston rod 11 of the water hydraulic cylinder 12 , and both ends of the sleeve 10 are interference fit with the piston rod 9 of the oil hydraulic cylinder 8 and the piston rod 11 of the water hydraulic cylinder 12 respectively.

[0065] The water hydraulic cylinder impact leakage detection test bench based on helium detection provided by the present invention is used as follows:

[0066] When the 2-position 3-way reversing solenoid valve is in the left position, the hydraulic pump 2 21 is opened to inject hydraulic oil into the rod chamber of the oil hydraulic cylinder 8, moving the piston rod to the far left and driving the piston rod; opening the helium cylinder 14, so that the helium from the helium cylinder 14 flows into the rodless chamber of the water hydraulic cylinder 12 through the pressure reducing valve 13, so that the right chamber of the water hydraulic cylinder 12 is filled with helium at a certain pressure; opening the hydraulic pump 1 2, placing the 3-position 4-way reversing valve in the right position, so that the piston of the booster cylinder 5 moves to the far left, and the right chamber of the booster cylinder 5 draws oil from the oil tank 1 through the one-way valve 2 23, and the oil in the left chamber of the booster cylinder 5 flows back to the oil tank 1 through the 3-position 4-way reversing valve; placing the 3-position 4-way reversing valve in the left position, the piston rod of the booster cylinder 5 starts to move right. Due to the action of the one-way valve 2 23, the oil will not flow to the oil tank 1 but to the accumulator 6; the pressure gauge 7 measures the pressure in the oil circuit; due to the existence of the one-way valve 3 24, the piston of the booster cylinder 5 can only Oil is drawn from the oil tank 1, avoiding drawing oil from the accumulator 6; the above process is repeated until the accumulator 6 reaches a certain pressure, the three-position four-way electromagnetic reversing valve is placed in the middle position, the hydraulic pump 2 is unloaded, and the booster cylinder 5 is locked; then the two-position three-way electromagnetic reversing valve 18 is placed in the right position, and the accumulator 6 begins to discharge. At this time, the pressure in the right chamber of the oil hydraulic cylinder 8 changes instantly, generating an impact. The relief valve three 22 can prevent the excessive pressure in the oil circuit from damaging the circuit; the impact will be transmitted from piston rod to piston rod, and the helium in the right chamber of the water hydraulic cylinder 12 will be impacted; if the helium leaks, it will leak from the right chamber of the water hydraulic cylinder 12 to the left chamber, and then diffuse into the sealed container 16. The helium mass spectrometer leak detector 15 determines whether the helium has leaked by detecting the helium concentration in the sealed container 16; when the impact is completed, the stop valve 20 is opened to allow the oil released by the accumulator 6 to flow back to the oil tank 1.

[0067] The present invention uses an accumulator 6 as a pressure power source, providing rapid, stable, and high-flow oil. This solves the problem of conventional hydraulic pumps' pressure and flow failing to meet testing requirements, ensuring stability during the test. Compared to conventional methods that use a falling hammer to generate impact, the present invention precisely controls the magnitude of the impact through the pressure in the accumulator 6, ensuring safety and reliability. The pressure in the relief valve 3 22 can be set to prevent damage to components caused by excessive impact.

[0068] Helium has a wide detection range. For tiny leaks, using helium as the detection gas will not block the tiny leak holes, and it can diffuse quickly, so it can detect hydraulic cylinders with tiny leaks.

[0069] The impact device of the present invention can generate a wide impact range. When generating large impacts, the use of helium as the detection gas is safe and reliable, and explosions will not occur even when subjected to large impacts. Furthermore, the use of a booster cylinder 5 avoids the problem of conventional pump pressure not meeting test requirements, thereby increasing the pressure within the accumulator 6 and amplifying the impact. The three-position, four-way solenoid valve 4 has a fast response speed, allowing the pressure to be quickly increased to a given value by controlling the three-position, four-way solenoid valve 4. The impact is achieved via a two-position, three-way solenoid reversing valve 18, facilitating timely detection and data recording.

[0070] After the impact is completed, the oil can be recovered in time by opening the stop valve 20 to avoid unnecessary waste; after the test is completed, the helium can be recovered in time to facilitate next use and save resources.

[0071] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A water hydraulic cylinder impact leakage detection test bench based on helium detection, characterized in that, Comprising: The test bench body; A water hydraulic cylinder (12), which is detachably mounted on the test bench body; A helium gas cylinder (14), the outlet end of the helium gas cylinder (14) is communicated with the rodless cavity of the water hydraulic cylinder (12), and a pressure reducing valve (13) is installed between the helium gas cylinder (14) and the water hydraulic cylinder (12); A sealed container (16), which is detachably mounted on the rod cavity of the water hydraulic cylinder (12), and a helium mass spectrometer leak detector (15) is installed on the sealed container (16); An impact device, which is fixedly mounted on the test bench body, and the impact device is connected to the piston rod of the water hydraulic cylinder (12), and the impact device is used to provide impact power for the water hydraulic cylinder (12).

2. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 1, characterized in that, The impact device includes: An oil tank (1); An oil hydraulic cylinder (8), which is detachably mounted on the test bench body, and the piston rod of the oil hydraulic cylinder (8) is connected to the piston rod of the water hydraulic cylinder (12); A second hydraulic pump (21), the inlet end of the second hydraulic pump (21) is communicated with the oil tank (1), the outlet end of the second hydraulic pump (21) is sequentially installed with a first check valve (19) and a two-position three-way electromagnetic directional control valve (18), one interface of the two-position three-way electromagnetic directional control valve (18) is communicated with the rod cavity of the oil hydraulic cylinder (8), and the other interface of the two-position three-way electromagnetic directional control valve (18) is communicated with the oil tank (1); An accumulator (6), which is communicated with the rodless cavity of the oil hydraulic cylinder (8), and the accumulator (6) is used to impact the water hydraulic cylinder (12) through the oil hydraulic cylinder (8); A pressurizing mechanism, one end of the pressurizing mechanism is communicated with the oil tank (1), the other end of the pressurizing mechanism is communicated with the accumulator (6), and the pressurizing mechanism is used to pressurize the accumulator (6).

3. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 2, characterized in that, The pressurizing mechanism includes: A pressurizing cylinder (5), a large piston and a small piston are arranged in the pressurizing cylinder (5), the large piston and the small piston are coaxially and fixedly arranged through a connecting shaft, the small piston end of the pressurizing cylinder (5) is communicated with the accumulator (6), and the small piston end of the pressurizing cylinder (5) is communicated with the oil tank (1); A third check valve (24) is installed between the pressurizing cylinder (5) and the accumulator (6), and a second check valve (23) is installed between the pressurizing cylinder (5) and the oil tank (1); A first hydraulic pump (2), the inlet end of the first hydraulic pump (2) is communicated with the oil tank (1), the outlet end of the first hydraulic pump (2) is communicated with a three-position four-way electromagnetic directional control valve (4), and the two interfaces of the three-position four-way electromagnetic directional control valve (4) are respectively communicated on both sides of the large piston of the pressurizing cylinder (5), and the last interface of the three-position four-way electromagnetic directional control valve (4) is communicated with the oil tank (1).

4. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 3, characterized in that, An overflow valve one (3) is arranged between the oil tank (1) and the three-position four-way electromagnetic directional control valve (4), and the overflow valve one (3) is arranged in parallel with the first hydraulic pump (2).

5. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 2, characterized in that, An overflow valve II (17) is provided between the fuel tank (1) and the two-position three-way electromagnetic directional control valve (18), and the overflow valve II (17) is arranged in parallel with the hydraulic pump II (21).

6. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 2, characterized in that, A pressure gauge (7) is installed on the pipeline between the accumulator (6) and the oil hydraulic cylinder (8).

7. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 6, characterized in that, The impact device further includes: A pressure relief circuit, the pressure relief circuit is arranged in parallel with the boosting mechanism, and one end of the pressure relief circuit is communicated between the accumulator (6) and the oil hydraulic cylinder (8), and the other end of the pressure relief circuit is communicated between the hydraulic pump II (21) and the fuel tank (1).

8. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 7, characterized in that, The pressure relief circuit includes a stop valve (20) and an overflow valve III (22) installed on the pipeline, and the stop valve (20) is arranged in parallel with the overflow valve III (22).

9. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 1, characterized in that, The sealed container (16) is threadedly connected to the water hydraulic cylinder (12), and an O-ring seal (25) is provided between the sealed container (16) and the water hydraulic cylinder (12); the helium mass spectrometer leak detector (15) is detachably installed in the helium detection port (26) of the sealed container (16).

10. The water hydraulic cylinder impact leakage detection test bench based on helium detection according to claim 2, characterized in that, A sleeve (10) is provided between the piston rod (9) of the oil hydraulic cylinder (8) and the piston rod (11) of the water hydraulic cylinder (12), and both ends of the sleeve (10) are in interference fit with the piston rod (9) of the oil hydraulic cylinder (8) and the piston rod (11) of the water hydraulic cylinder (12) respectively.

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