Test apparatus and method for pulse high-pressure cycling of gas cylinders

Abstract

This invention provides a test apparatus and method for pulsed high-pressure circulation of gas cylinders, comprising: an oil pump pressurizing oil; a pulse generator containing an oil cylinder and a water cylinder connected by a piston; a gas cylinder connected to one end of the water cylinder of the pulse generator via a pipeline, the reciprocating motion of the piston between the oil cylinder and the water cylinder in the pulse generator controlling the pressure of the gas cylinder; a filling and venting device connected to and injecting water into the water cylinder of the pulse generator; the oil cylinder of the pulse generator connected to the oil pump of the pulse generator; a servo valve and a proportional pressure reducing valve connected between the pulse generator and the oil pump, controlling the output oil pressure, wherein the water pressure and oil pressure of the pulse generator are proportional; the upper and lower limits of the circulation pressure and the frequency changes of the oil cylinder and the servo valve drive the circulation pressure and frequency of the gas cylinder; the oil in the servo valve and the pulse generator, after being pressurized, flows back to the oil cooler for cooling. This application has the advantages of high reliability, high efficiency, high accuracy, low fluctuation, and reliable test results.

Description

Technical Field

[0001] This invention belongs to the field of gas cylinder pressure fatigue testing technology, specifically, it relates to a test device and method for gas cylinder pulse high-pressure cycle. Background Technology

[0002] In recent years, with the development needs of manned lunar landing propulsion systems, a high-pressure composite gas cylinder for long-term on-orbit operation has been developed. Since the pressure of the gas cylinder will change due to changes in ambient temperature during long-term on-orbit operation, it is necessary to conduct 10,000 pressure cycle tests based on the operation process. At the same time, based on the relationship between the pressure and temperature of the gas cylinder, it is calculated that the pressure range of the gas cylinder fluctuates within a certain high pressure range. Therefore, in order to verify the impact of pressure changes on the performance of the gas cylinder, it is necessary to conduct pulse pressure cycle tests on the gas cylinder to quickly achieve 10,000 pressure fatigue cycles.

[0003] Patent document CN119197940A discloses a pressure testing method and apparatus for a gas cylinder. The method involves injecting purified water into the gas cylinder until the ratio of the volume of purified water in the cylinder to the total volume of the cylinder reaches a preset range; then injecting gas into the cylinder until the pressure inside the cylinder reaches a preset pressure. At least two pressure gauges are used to continuously monitor the pressure inside the cylinder. During gas injection, the inlet of the cylinder is connected to the outlet of a filling pipe via a connector. A first pressure gauge is located in an observation chamber and connected to the pressure test end of the filling pipe, while a second pressure gauge is connected to the inlet of the cylinder via a connector. When the pressure inside the cylinder remains at the preset pressure for a preset duration, the cylinder is depressurized to obtain a depressurized cylinder.

[0004] Although patent document CN119197940A can achieve pressure cycling of gas cylinders from 0 to a certain value, its pressure cycling speed is slow, the pressure waveform is uncontrollable, it cannot form a pressure cycling interval between two pressure values, and it cannot quickly achieve 10,000 pressure fatigue tests on gas cylinders.

[0005] To address this issue, a pulsed pressure cycle control system for gas cylinders was implemented. This system exhibits good pressure waveform consistency and fast pressure response, making the testing device convenient to operate, safe, reliable, advanced in control, highly accurate, and with stable waveforms. Therefore, this invention designs a pulsed high-pressure cycle testing device and method for gas cylinders, solving the aforementioned problems. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of this invention is to provide a test device and method for pulse-type high-pressure cycling of gas cylinders.

[0007] A test device for pulse-type high-pressure cycling of gas cylinders according to the present invention includes: a hydraulic power unit, a pressure pulse control unit, and a filling and venting unit;

[0008] Hydraulic power units include oil pumps and oil coolers;

[0009] The oil pump pressurizes the oil;

[0010] The pressure pulse control device includes a pulse generator, a gas cylinder, a servo valve, and a proportional pressure reducing valve.

[0011] The pulse generator contains an oil cylinder and a water cylinder, connected by a piston.

[0012] The gas cylinder is connected to one end of the water cylinder of the pulse generator by a pipeline. The reciprocating motion of the piston between the oil cylinder and the water cylinder in the pulse generator controls the pressure of the gas cylinder.

[0013] The liquid filling and venting device is connected and injects water into the water tank of the pulse generator;

[0014] The pulse generator cylinder is connected to the pulse generator pump;

[0015] The servo valve and the proportional pressure reducing valve are connected between the pulse generator and the oil pump, and control the output oil pressure. The water pressure and oil pressure of the pulse generator are proportional.

[0016] The upper and lower limits of the circulating pressure and the frequency changes of the hydraulic cylinder and servo valve drive the magnitude and frequency of the circulating pressure of the gas cylinder.

[0017] The oil in the servo valve and pulse generator is pressurized and then flows back to the oil cooler for cooling.

[0018] Preferably, the hydraulic power unit further includes an oil tank, a temperature sensor, a manual relief valve, and a check valve;

[0019] The oil tank stores hydraulic oil, and the temperature sensor is housed in the oil tank. The oil in the oil tank is pressurized by the oil pump.

[0020] The oil pump is equipped with a suction filter and a high-pressure filter at both ends of the oil circuit.

[0021] The front end of the check valve is connected to the high-pressure filter, and the rear end extends to connect to the proportional pressure reducing valve, with one-way communication from the front end to the rear end.

[0022] The manual relief valve connects the check valve and the high-pressure filter. The high-pressure oil is returned to the oil tank after being depressurized by the manual relief valve and cooled by the oil cooler.

[0023] Preferably, the liquid filling and venting device includes a water tank, a water filter, a pneumatic diaphragm pump, and a hydraulic pump;

[0024] The water tank is equipped with a level transmitter;

[0025] The pneumatic diaphragm pump injects water into the pipeline on one side of the pulse generator's water cylinder and replenishes water to the gas cylinder during the charging and discharging process;

[0026] The hydraulic pump applies basic pressure to the gas cylinder's water filling pipeline and to remove air from the gas cylinder.

[0027] The water filter is located at the rear of the water tank.

[0028] Preferably, the pressure pulse control device further includes an unloading valve, a first pressure sensor, a second pressure sensor, and a third pressure sensor;

[0029] The third pressure sensor is connected between the gas cylinder and the pulse generator, displays the pressure value inside the gas cylinder, and feeds back the pressure signal;

[0030] The unloading valve is connected between the gas cylinder and the pulse generator to depressurize the gas cylinder;

[0031] The first pressure sensor and the second pressure sensor are respectively located at the front and rear ends of the proportional pressure reducing valve.

[0032] When the proportional pressure reducing valve is in a high-pressure state, the proportional pressure reducing valve adjusts the input servo valve pressure according to the input signal pressure value.

[0033] When the proportional pressure reducing valve is in an overpressure state, the proportional pressure reducing valve controls the manual relief valve to perform backflow pressure reduction.

[0034] Preferably, an accumulator is installed between the oil pump and the proportional pressure reducing valve. The accumulator is a bladder-type energy absorber that can absorb the volume expansion of the medium generated during oil circulation. The accumulator can withstand a pressure intensity of not less than 1.5 times the test pressure.

[0035] Preferably, the pulse generator pressure cycle is a closed loop with a constant base pressure superimposed with an alternating pressure source that changes according to a certain pattern. The lower limit pressure of the alternating pressure source is the same as the base pressure of the loop system. The driving end pressure of the pulse generator is controlled by a proportional pressure reducing valve, and the pulse generator reversing valve controls the repeated pressurization of the pulse generator.

[0036] Preferably, the servo valve receives a high-pressure oil source from the front end and controls the pulse generator according to the electronic control signal, so that the pulse generator runs at a high frequency according to the set value and outputs a variety of test waveforms, including sine, trapezoidal and linear waves.

[0037] Preferably, the maximum boost pressure of the oil pump is not less than 25 MPa.

[0038] Preferably, the servo valve controls the operation of the pulse generator. The servo valve receives electrical analog signals and outputs modulated flow and pressure accordingly to drive the pulse generator to cyclically load.

[0039] According to the present invention, a test method for pulsed high-pressure cycling of gas cylinders is provided, employing a test apparatus for pulsed high-pressure cycling of gas cylinders, and the steps include:

[0040] Step S1: The hydraulic pump pressurizes the pipeline and gas cylinder;

[0041] Step S2: The hydraulic power unit pressurizes the pulse generator through an oil pump;

[0042] Step S3: The servo valve and the proportional pressure reducing valve control the oil pressure of the pulse generator, and pressurize or depressurize the gas cylinder according to the ratio of the oil pressure of the pulse generator to the hydraulic pressure.

[0043] Step S4: The oil is cooled by the oil cooler and returned to the oil tank, forming a closed loop in the oil circuit.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. In this invention, the pulse generator contains an oil cylinder and a water cylinder, connected by a piston rod in the middle. The servo valve can control the oil pressure in the oil cylinder. The oil cylinder and water cylinder in the pulse generator have a pressure ratio adjustment function.

[0046] 2. The accumulator of this invention effectively solves the problem of gas cylinder volume expansion and ensures the accuracy of servo valve control.

[0047] 3. This invention can solve the problem of pressure fatigue cycle of gas cylinders for tens of thousands of cycles. It has good reliability, high precision, fast response speed and stable waveform. It effectively simulates the pressure range cycle change of high pressure composite gas cylinders and evaluates the high pressure fatigue performance of gas cylinders. Attached Figure Description

[0048] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0049] Figure 1 This is a structural diagram of the experimental device of the present invention.

[0050] The diagram shows: 1 is the oil tank; 2 is the temperature sensor; 3 is the suction filter; 4 is the oil pump; 5 is the oil cooler; 6 is the return filter; 7 is the high-pressure filter; 8 is the manual relief valve; 9 is the check valve; 10 is the accumulator; 11 is the proportional pressure reducing valve; 12 is the first pressure sensor; 13 is the second pressure sensor; 14 is the servo valve; 15 is the pulse generator; 16 is the third pressure sensor; 17 is the unloading valve; 18 is the gas cylinder; 19 is the hydraulic pump; 20 is the pneumatic diaphragm pump; 21 is the water filter; and 22 is the water tank. Detailed Implementation

[0051] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0052] like Figure 1 As shown, a test device for pulse-type high-pressure cycling of gas cylinders includes: a hydraulic power unit, a pressure pulse control unit, and a filling and venting device.

[0053] The hydraulic power unit includes an oil tank 1, a temperature sensor 2, an oil pump 4, an oil cooler 5, a manual relief valve 8, and a check valve 9;

[0054] Hydraulic oil is stored in oil tank 1, and temperature sensor 2 is housed inside oil tank 1.

[0055] The oil in tank 1 is pressurized by pump 4 and transported to the rear end;

[0056] Oil pump 4 is equipped with a suction filter 3 and a high-pressure filter 7 at the front and rear ends of the oil circuit to ensure the cleanliness of the oil source output to the pressure pulse control device. The maximum boost pressure of oil pump 4 is not less than 25MPa.

[0057] The pressure pulse control device includes an unloading valve 17, a first pressure sensor 12, a second pressure sensor 13 and a third pressure sensor 16, a pulse generator 15, a gas cylinder 18, a servo valve 14, and a proportional pressure reducing valve 11.

[0058] The pulse generator 15 contains an oil cylinder and a water cylinder, which are connected by a piston.

[0059] Gas cylinder 18 is connected to one end of the water cylinder of pulse generator 15 by a pipeline. The reciprocating motion of the piston between the oil cylinder and the water cylinder in pulse generator 15 controls the pressure of gas cylinder 18. The maximum test pressure of gas cylinder 18 is 35MPa.

[0060] The liquid filling and venting device is connected and water is injected into the water tank of pulse generator 15.

[0061] The liquid filling and venting device includes a water tank 22, a water filter 21, a pneumatic diaphragm pump 20, and a hydraulic pump 19;

[0062] Water tank 22 is equipped with a level transmitter;

[0063] The pneumatic diaphragm pump 20 injects water into the pipeline on one side of the water cylinder of the pulse generator 15, and replenishes water to the gas cylinder 18 during the filling and releasing process;

[0064] Hydraulic pump 19 injects water into gas cylinder 18 to discharge the pipeline and air from gas cylinder 18, and applies basic pressure;

[0065] Water filter 21 is located at the rear end of water tank 22.

[0066] Pulse generator 15 is connected to oil pump 4;

[0067] Servo valve 14 and proportional pressure reducing valve 11 are connected between pulse generator 15 and oil pump 4, and control the output oil pressure. The water pressure and oil pressure of pulse generator 15 are proportional to each other, realizing pressure control of gas cylinder 18, and the pressure is accurate and the waveform feedback signal is good.

[0068] The upper and lower limits and frequency changes of the circulating pressure of the hydraulic cylinder and servo valve 14 drive the circulating pressure and frequency of the gas cylinder 18 to achieve multiple pressure cycles per minute.

[0069] The third pressure sensor 16 is connected between the gas cylinder 18 and the pulse generator 15, displays the pressure value inside the gas cylinder 18, and feeds back the pressure signal;

[0070] The unloading valve 17 is connected between the gas cylinder 18 and the pulse generator 15, and can depressurize the gas cylinder 18.

[0071] The first pressure sensor 12 and the second pressure sensor 13 are respectively installed at the front and rear ends of the proportional pressure reducing valve 11, and the oil pressure can be viewed on-site and remotely.

[0072] When the proportional pressure reducing valve 11 is in a high-pressure state, the proportional pressure reducing valve 11 adjusts the pressure of the input servo valve 14 according to the input signal pressure value.

[0073] When the proportional pressure reducing valve 11 is in an overpressure state, the proportional pressure reducing valve 11 controls the manual relief valve 8 to perform backflow pressure reduction.

[0074] The pulse generator 15 pressure cycle is a closed-loop circulation circuit with a constant base pressure superimposed with a regularly changing alternating pressure source. The lower limit pressure of the alternating pressure source is the same as the base pressure of the circulation system. The power source for the alternating pressure is provided by a constant pressure hydraulic station. The driving end pressure of the pulse generator 15 is controlled by the proportional pressure reducing valve 11. The servo valve 14 receives electrical analog signals and outputs modulated flow and pressure accordingly to drive the cyclic loading of the pulse generator 15. The pulse generator reversing valve controls the repeated cyclic loading of the pulse generator 15. The servo valve 14 receives high-pressure oil from the front end and controls the pulse generator 15 according to the electrical control signal, so that the pulse generator 15 runs at high frequency according to the set value and outputs various test waveforms, including sine, trapezoidal, and linear waves.

[0075] The front end of the one-way valve 9 is connected to the high-pressure filter 7, and the rear end extends to connect to the proportional pressure reducing valve 11, and is unidirectionally connected from the front end to the rear.

[0076] Oil cooler 5 is an air-cooled structure;

[0077] The manual relief valve 8 is connected between the check valve 9 and the high-pressure filter 7. The high-pressure oil is returned and depressurized by the manual relief valve 8, filtered by the return oil filter 6, cooled by the oil cooler 5, and then flows back to the oil tank 1.

[0078] After being pressurized, the oil in the servo valve 14 and pulse generator 15 is filtered by the return oil filter 6 and then flows back to the oil cooler 5 for cooling before flowing back to the oil tank 1.

[0079] An accumulator 10 is installed between the oil pump 4 and the proportional pressure reducing valve 11. The accumulator 10 is a bladder-type energy absorber that can absorb the volume expansion of the medium generated during oil circulation. The accumulator 10 can withstand a pressure intensity of not less than 1.5 times the test pressure.

[0080] The device of this invention adopts a servo valve closed-loop control method and utilizes a pulse generator to perform high-frequency reciprocating operation to achieve oil pressure control, water pressure control, and frequency control. It enables the gas cylinder to undergo tens of thousands of continuous fatigue tests. The device is easy to operate, safe and reliable, and effectively verifies the influence of pressure changes on the performance of composite material gas cylinders.

[0081] This embodiment also provides a test method for pulsed high-pressure cycling of gas cylinders, used for testing pulsed high-pressure cycling of gas cylinders, the steps of which include:

[0082] Step S1: The hydraulic pump 19 pressurizes the pipeline and the gas cylinder 18.

[0083] Step S2: The hydraulic power unit pressurizes the pulse generator 15 through the oil pump 4.

[0084] Step S3: Servo valve 14 and proportional pressure reducing valve 11 control the oil pressure of pulse generator 15, and pressurize or depressurize the gas cylinder 18 according to the ratio of oil pressure and hydraulic pressure of pulse generator 15.

[0085] Step S4: The oil is cooled by the oil cooler 5 and returned to the oil tank 1, forming a closed loop in the oil circuit.

[0086] Specifically: The test medium is pressurized and delivered from the water tank 22 to the pulse generator 15 via the pneumatic diaphragm pump 20 and the hydraulic pump 19. Before the test, the hydraulic pump 19 needs to pressurize the gas cylinder 18 separately to a certain pressure. After reaching a certain pressure, the oil pressure continues to pressurize the test medium in stages through the servo valve 14. The pressurization frequency and test pressure are controlled by the electrical signal of the servo valve 14 to form a pulse pressurization of the gas cylinder 18, realizing the pulse pressure range circulation of the gas cylinder 18. The pulse generator 15 controlled by the servo valve 14 needs to cool the oil. An oil circuit is formed through pipelines and a manual overflow valve 8. After being cooled by the oil cooler 5, the oil returns to normal temperature. An oil suction filter 3 and a high-pressure filter 7 are installed at the inlet end of the oil circuit, and a return oil filter 6 is installed in the return oil pipeline to ensure the cleanliness of the oil.

[0087] Preferably, the suction filter 3 and the high-pressure filter 7 can filter impurities in the oil in the oil tank 1, avoiding the impact of impurities on the accuracy of the proportional pressure reducing valve 11 and the servo valve 14.

[0088] Preferably, the pulse generator 15 and the servo valve 14 form a linkage control system, and the boosting frequency is controlled by the electrical signal of the servo valve 14.

[0089] Preferably, the pulse generator 15 is divided into an oil cylinder and a water cylinder. The oil and water are squeezed in a certain pressure ratio relationship, and the low pressure input of the oil cylinder controls the high pressure output of the water cylinder.

[0090] Preferably, in the pressure control of the proportional pressure reducing valve 11, the output overpressure oil is controlled by the manual relief valve 8. When the pressure drops, the manual relief valve 8 discharges the excess oil, thereby reducing the internal circulation pressure of the gas cylinder 18.

[0091] Preferably, under the joint control of the pulse generator 15 and the servo valve 14, the pulse pressure wave can form multiple sine waves with stable waveforms and small errors.

[0092] Preferably, the hydraulic pump 19 is an air-driven pump. Before the oil pressure is increased, the gas cylinder 18 needs to be vented and the medium pre-pressurized by the hydraulic pump 19.

[0093] This invention realizes a pulsed pressure cycle for gas cylinders. In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0094] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A test device for pulse-type high-pressure cycling of gas cylinders, characterized in that, include: Hydraulic power unit, pressure pulse control device, fluid filling and venting device; The hydraulic power unit includes an oil pump (4) and an oil cooler (5); The oil pump (4) pressurizes the oil; The pressure pulse control device includes a pulse generator (15), a gas cylinder (18), a servo valve (14), and a proportional pressure reducing valve (11). The pulse generator (15) contains an oil cylinder and a water cylinder, which are connected by a piston in the middle; The gas cylinder (18) is connected to one end of the water cylinder of the pulse generator (15) by a pipeline. The reciprocating motion of the piston between the oil cylinder and the water cylinder in the pulse generator (15) controls the pressure of the gas cylinder (18). The liquid filling and venting device is connected to and injects water into the water tank of the pulse generator (15); The liquid filling and venting device includes a water tank (22), a water filter (21), a pneumatic diaphragm pump (20), and a hydraulic pump (19). The water tank (22) is equipped with a level transmitter; The pneumatic diaphragm pump (20) injects water into the pipeline on one side of the water tank of the pulse generator (15) and replenishes water to the gas cylinder (18) during the filling and releasing process; The hydraulic pump (19) injects water into the gas cylinder (18) to discharge the pipeline and the air in the gas cylinder (18) and applies basic pressure; The water filter (21) is located at the rear end of the water tank (22); The pulse generator (15) cylinder is connected to the pulse generator (15) oil pump; The servo valve (14) and the proportional pressure reducing valve (11) are connected between the pulse generator (15) and the oil pump (4) and control the output oil pressure. The water pressure and oil pressure of the pulse generator (15) are proportional. The upper and lower limits of the circulating pressure and the frequency change of the oil cylinder and servo valve (14) drive the magnitude and frequency of the circulating pressure of the gas cylinder (18); The oil in the servo valve (14) and pulse generator (15) is pressurized and then flows back to the oil cooler (5) for cooling.

2. The test apparatus for pulsed high-pressure cycling of gas cylinders according to claim 1, characterized in that, The hydraulic power unit also includes an oil tank (1), a temperature sensor (2), a manual relief valve (8), and a check valve (9). Hydraulic oil is stored in the oil tank (1), and the temperature sensor (2) is housed in the oil tank (1). The oil in the oil tank (1) is pressurized by the oil pump (4). The oil pump (4) is equipped with a suction filter (3) and a high-pressure filter (7) at the front and rear ends of the oil circuit. The front end of the one-way valve (9) is connected to the high-pressure filter (7), and the rear end extends to connect to the proportional pressure reducing valve (11), and is connected in one direction from the front end to the rear. The manual relief valve (8) is connected between the check valve (9) and the high pressure filter (7). The high pressure oil is returned and depressurized by the manual relief valve (8), filtered by the return oil filter (6), cooled by the oil cooler (5), and then flows back to the oil tank (1).

3. The test apparatus for pulsed high-pressure cycling of gas cylinders according to claim 2, characterized in that, The pressure pulse control device also includes an unloading valve (17), a first pressure sensor (12), a second pressure sensor (13), and a third pressure sensor (16). The third pressure sensor (16) is connected between the gas cylinder (18) and the pulse generator (15), displays the pressure value inside the gas cylinder (18), and feeds back the pressure signal; The unloading valve (17) is connected between the gas cylinder (18) and the pulse generator (15) and can depressurize the gas cylinder (18); The first pressure sensor (12) and the second pressure sensor (13) are respectively located at the front and rear ends of the proportional pressure reducing valve (11); When the proportional pressure reducing valve (11) is in a high-pressure state, the proportional pressure reducing valve (11) adjusts the pressure of the input servo valve (14) according to the input signal pressure value; When the proportional pressure reducing valve (11) is in an overpressure state, the proportional pressure reducing valve (11) controls the manual relief valve (8) to perform backflow pressure reduction.

4. The test apparatus for pulsed high-pressure cycling of gas cylinders according to claim 1, characterized in that, An accumulator (10) is installed between the oil pump (4) and the proportional pressure reducing valve (11). The accumulator (10) is a bladder-type energy absorber that can absorb the volume expansion of the medium generated during the oil circulation process. The accumulator (10) can withstand a pressure intensity of not less than 1.5 times the test pressure.

5. The test apparatus for pulsed high-pressure cycling of gas cylinders according to claim 1, characterized in that, The pulse generator (15) pressure cycle is a closed loop with a constant base pressure superimposed with an alternating pressure source that changes according to a certain pattern. The lower limit pressure of the alternating pressure source is the same as the base pressure of the loop system. The driving end pressure of the pulse generator (15) is controlled by the proportional pressure reducing valve (11), and the reversing valve of the pulse generator (15) controls the repeated pressurization of the pulse generator (15).

6. The test apparatus for pulsed high-pressure cycling of gas cylinders according to claim 5, characterized in that, The servo valve (14) receives the high-pressure oil source at the front end and controls the pulse generator (15) according to the electronic control signal, so that the pulse generator (15) runs at high frequency according to the set value and outputs a variety of test waveforms, including sine, trapezoidal and linear waves.

7. The test apparatus for pulsed high-pressure cycling of gas cylinders according to claim 1, characterized in that, The maximum boost pressure of the oil pump (4) shall not be less than 25 MPa.

8. The test apparatus for pulsed high-pressure cycling of gas cylinders according to claim 1, characterized in that, The servo valve (14) controls the action of the pulse generator (15). The servo valve (14) receives electrical analog signals and outputs modulated flow and pressure accordingly to drive the pulse generator (15) to cyclically load.

9. A test method for pulsed high-pressure cycling of gas cylinders, using the test apparatus for pulsed high-pressure cycling of gas cylinders as described in any one of claims 1-8, characterized in that the steps... include: Step S1: The hydraulic pump (19) pressurizes the pipeline and the gas cylinder (18). The hydraulic pump (19) is an air-driven pump. Before the oil pressure is increased, the gas cylinder (18) needs to be vented and the medium pre-pressurized by the hydraulic pump (19). Step S2: The hydraulic power unit pressurizes the pulse generator (15) through the oil pump (4); Step S3: The servo valve (14) and the proportional pressure reducing valve (11) control the oil pressure of the pulse generator (15) to increase or decrease the pressure in the gas cylinder (18) according to the ratio of the oil pressure of the pulse generator (15) and the hydraulic pressure. Step S4: The oil is cooled by the oil cooler (5) and returned to the oil tank (1), forming a closed loop in the oil circuit.

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