Gas cylinder pulse type high-pressure circulation test device and method

Abstract

The invention provides a gas cylinder pulse type high-pressure circulation test device and method. The method comprises the steps that an oil pump pressurizes oil; an oil cylinder and a water cylinder are arranged in the pulse generator and are connected through a piston; the gas cylinder is communicated with one end of a water cylinder of the pulse generator through a pipeline; a piston between an oil cylinder and the water cylinder in the pulse generator reciprocates to control the pressure of the gas cylinder; the liquid filling and exhausting device is communicated and injects water into the pulse generator water cylinder; the pulse generator oil cylinder is communicated with the pulse generator oil pump; the servo valve and the proportional pressure reducing valve are communicated between the pulse generator and the oil pump and control the output oil pressure, and the water pressure of the pulse generator is proportional to the oil pressure; upper and lower limit values and frequency changes of circulating pressure of the oil cylinder and the servo valve drive the circulating pressure and frequency of the gas cylinder; oil in the servo valve and the pulse generator is pressurized and then flows back into the oil cooler to be cooled. The device has the advantages of being good in reliability, high in efficiency, accurate in precision, small in volatility and reliable in test result.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas cylinder pressure fatigue testing, and in particular relates to a gas cylinder pulse high-pressure cycle testing device and method. Background Art

[0002] In recent years, with the need to develop a manned lunar landing power system, a high-pressure composite gas cylinder for long-term in-orbit operation has been developed. Since the long-term in-orbit operation of the gas cylinder will cause pressure changes due to changes in ambient temperature, according to calculations during the operation process, it is necessary to carry out 10,000 pressure cycle tests. 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 between certain high pressures. Therefore, in order to verify the impact of pressure changes on the performance of the gas cylinder, it is necessary to carry out a pulse pressure cycle test of the gas cylinder to quickly achieve 10,000 pressure fatigue of the gas cylinder.

[0003] Patent document CN119197940A discloses a method and device for pressure testing of gas cylinders, which comprises injecting pure water into the gas cylinder to be tested until the ratio of the volume of pure water in the gas cylinder to be tested to the total volume of the gas cylinder to be tested reaches a preset range; injecting gas into the gas cylinder to be tested until the pressure inside the gas cylinder to be tested reaches a preset pressure, wherein at least two pressure gauges are provided to continuously detect the pressure inside the gas cylinder to be tested, and when the gas is injected, the inlet of the gas cylinder to be tested is connected to the gas outlet end of the inflation pipe through a connector, the first pressure gauge is provided in an observation room and connected to the pressure test end of the inflation pipe, and the second pressure gauge is connected to the inlet of the gas cylinder to be tested through a connector; when the pressure inside the gas cylinder to be tested maintains the preset pressure for a preset time, the pressure is released to obtain the depressurized gas cylinder.

[0004] Although patent document CN119197940A can realize pressure cycling from 0 to a certain value for gas cylinders, its pressure cycling speed is slow, the pressure waveform is uncontrollable, and it is impossible to form an interval pressure cycle between two pressure values, and to quickly realize 10,000 pressure fatigue tests on gas cylinders.

[0005] To achieve this goal, pulsed pressure cycling control of gas cylinders is achieved, resulting in a system with good pressure waveform compliance and a fast pressure response speed, making the test device easy to operate, safe and reliable, with advanced control, high precision, and stable waveforms. To this end, the present invention designs a gas cylinder pulsed high-pressure cycling test device and method to solve the above-mentioned problems. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a test device and method for pulsed high-pressure circulation of gas cylinders.

[0007] According to the present invention, a gas cylinder pulse high-pressure cycle test device is provided, comprising: a hydraulic power device, a pressure pulse control device, and a liquid filling and exhaust device; The hydraulic power unit includes an oil pump and an oil cooler; The oil pump pressurizes the oil; The pressure pulse control device includes a pulse generator, a gas cylinder, a servo valve, and a proportional pressure reducing valve; The pulse generator contains an oil cylinder and a water cylinder, which are connected by a piston; The gas cylinder is connected to one end of the pulse generator water cylinder through 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; The liquid filling and exhaust device is connected and water is injected into the pulse generator water cylinder; The pulse generator oil cylinder is connected to the pulse generator oil pump; The servo valve and proportional pressure reducing valve are connected between the pulse generator and the oil pump, and control the output oil pressure. The pulse generator water pressure and oil pressure are proportional; The upper and lower limits and frequency changes of the circulating pressure of the oil cylinder and servo valve, and the circulating pressure and frequency of the driving gas cylinder; The oil in the servo valve and pulse generator is pressurized and then flows back to the oil cooler for cooling.

[0008] Preferably, the hydraulic power unit further includes an oil tank, a temperature sensor, a manual relief valve, and a one-way valve; The oil tank stores hydraulic oil, the temperature sensor is placed in the oil tank, and the oil in the oil tank is pressurized by the oil pump; The oil circuits at both ends of the oil pump are equipped with an oil suction filter and a high-pressure filter respectively; The front end of the one-way valve is connected to the high-pressure filter, and the rear end extends to communicate with the proportional pressure reducing valve, and is connected in one direction from the front end to the rear; The manual relief valve is connected between the one-way valve and the high-pressure filter. The high-pressure oil is returned by the manual relief valve to reduce the pressure, and then flows back to the oil tank after being cooled by the oil cooler.

[0009] Preferably, the liquid filling and exhaust device includes a water tank, a water filter, a pneumatic diaphragm pump, and a hydraulic pump; The water tank is equipped with a liquid level transmitter; The pneumatic diaphragm pump injects water into the pipeline on one side of the pulse generator water cylinder and replenishes water to the gas cylinder during the filling and deflation process; The hydraulic pump applies basic pressure to the cylinder water discharge pipeline and the air in the cylinder; The water filter is arranged at the rear end of the water tank.

[0010] Preferably, the pressure pulse control device further comprises an unloading valve, a first pressure sensor, a second pressure sensor and a third pressure sensor; The third pressure sensor is connected between the gas cylinder and the pulse generator to display the pressure value in the gas cylinder and feedback the pressure signal; The unloading valve is connected between the gas cylinder and the pulse generator to relieve the pressure of the gas cylinder; The first pressure sensor and the second pressure sensor are respectively arranged at the front and rear ends of the proportional pressure reducing valve; 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; 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.

[0011] 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 the oil circulation process. The accumulator can withstand a pressure strength not less than 1.5 times the test pressure.

[0012] Preferably, the pulse generator pressure cycle is to superimpose an alternating pressure source that changes regularly in a closed circulation loop with a constant base pressure. The lower limit pressure of the alternating pressure source is the same as the base pressure of the circulation 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.

[0013] Preferably, the servo valve receives a front-end high-pressure oil source and controls the pulse generator according to an electric control signal, so that the pulse generator reciprocates at a high frequency according to a set value and outputs a variety of test waveforms, including sine, trapezoidal, and straight waves.

[0014] Preferably, the maximum boost value of the oil pump is not less than 25 MPa.

[0015] Preferably, the servo valve controls the action of the pulse generator. The servo valve receives an electrical analog signal and outputs modulated flow and pressure accordingly to drive the cyclic loading of the pulse generator.

[0016] According to the present invention, a test method for a gas cylinder pulse high-pressure cycle is provided, which uses a test device for a gas cylinder pulse high-pressure cycle, and the steps include: Step S1: The hydraulic pump pressurizes the pipeline and the gas cylinder; Step S2: The hydraulic power unit pressurizes the pulse generator through the oil pump; Step S3: The servo valve and the proportional pressure reducing valve control the oil pressure of the pulse generator, and increase or reduce the pressure in the gas cylinder according to the proportional relationship between the oil pressure of the pulse generator and the hydraulic pressure; Step S4: The oil is cooled by the oil cooler and returns to the oil tank, and the oil circuit forms a closed loop.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The pulse generator of the present invention contains an oil cylinder and a water cylinder, which are connected by an intermediate piston rod. The servo valve can control the oil pressure in the oil cylinder. The oil cylinder and the water cylinder in the pulse generator have a pressure proportional adjustment function.

[0018] 2. The accumulator of the present invention effectively solves the problem of volume expansion of the gas cylinder and ensures the accuracy of the servo valve control precision.

[0019] 3. The present invention can solve the problem of tens of thousands of pressure fatigue cycles of gas cylinders. It has good reliability, high precision, fast response speed, and stable waveform. It effectively simulates the changes in the pressure interval cycle of high-pressure composite gas cylinders and assesses the high-pressure fatigue performance of gas cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings: Figure 1 It is a structural diagram of the test device of the present invention.

[0021] As shown in the figure, 1 is an oil tank; 2 is a temperature sensor; 3 is an oil suction filter; 4 is an oil pump; 5 is an oil cooler; 6 is a return oil filter; 7 is a high-pressure filter; 8 is a manual overflow valve; 9 is a one-way valve; 10 is an accumulator; 11 is a proportional pressure reducing valve; 12 is a first pressure sensor; 13 is a second pressure sensor; 14 is a servo valve; 15 is a pulse generator; 16 is a third pressure sensor; 17 is an unloading valve; 18 is a gas cylinder; 19 is a hydraulic pump; 20 is a pneumatic diaphragm pump; 21 is a water filter; and 22 is a water tank. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0023] like Figure 1 As shown, a test device for pulse high-pressure circulation of gas cylinders includes: a hydraulic power device, a pressure pulse control device, and a liquid filling and exhaust device; The hydraulic power unit includes an oil tank 1, a temperature sensor 2, an oil pump 4, an oil cooler 5, a manual overflow valve 8, and a one-way valve 9; The oil tank 1 stores hydraulic oil, and the temperature sensor 2 is accommodated in the oil tank 1; The oil in the oil tank 1 is pressurized by the oil pump 4 and transported to the rear end; The oil circuits at both ends of the oil pump 4 are equipped with an oil suction filter 3 and a high-pressure filter 7 respectively to ensure the cleanliness of the oil source output to the pressure pulse control device. The maximum boost value of the oil pump 4 is not less than 25 MPa. 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; The pulse generator 15 contains an oil cylinder and a water cylinder, which are connected by a piston; 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 maximum test pressure of the gas cylinder 18 is 35MPa. The liquid filling and exhaust device is connected and water is injected into the water cylinder of the pulse generator 15. The liquid filling and exhaust 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 provided with a liquid level transmitter; The pneumatic diaphragm pump 20 fills the pipeline on one side of the pulse generator 15 water cylinder with water, and replenishes water to the gas cylinder 18 during the charging and discharging process; The hydraulic pump 19 applies base pressure to the water-filled and air-exhausted pipelines of the cylinder 18 and the cylinder 18; The water filter 21 is disposed at the rear end of the water tank 22 .

[0024] The pulse generator 15 oil cylinder is connected to the oil pump 4; 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 to each other, realizing the pressure control of the gas cylinder 18, and the pressure is accurate and the waveform feedback signal is good. The upper and lower limits and frequency of the cycle pressure of the oil cylinder and servo valve 14 change, driving the cycle pressure size and frequency of the gas cylinder 18 to achieve multiple pressure cycles per minute; The third pressure sensor 16 is connected between the gas cylinder 18 and the pulse generator 15 to display the pressure value in the gas cylinder 18 and feedback the pressure signal; The unloading valve 17 is connected between the gas cylinder 18 and the pulse generator 15 to relieve the pressure of the gas cylinder 18; The first pressure sensor 12 and the second pressure sensor 13 are respectively arranged at the front and rear ends of the proportional pressure reducing valve 11, so that the oil outlet pressure can be checked on-site and remotely; 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 reflux pressure reduction.

[0025] The pressure cycle of the pulse generator 15 is to superimpose an alternating pressure source that changes regularly in a closed circulation loop with a constant base pressure. The lower limit pressure of the alternating pressure source is the same as the base pressure of the circulation system. The power source of 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 the electrical analog signal and outputs the 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 the front-end high-pressure oil source and controls the pulse generator 15 according to the electrical control signal, so that the pulse generator 15 runs back and forth at a high frequency according to the set value and outputs a variety of test waveforms, including sine, trapezoidal, and linear waves.

[0026] The front end of the one-way valve 9 is connected to the high-pressure filter 7, and the rear end extends to communicate with the proportional pressure reducing valve 11, and is connected in one direction from the front end to the rear; The oil cooler 5 is an air-cooled structure; The manual relief valve 8 is connected between the one-way valve 9 and the high-pressure filter 7. The high-pressure oil flows back through the manual relief valve 8 to reduce the pressure, is filtered by the return oil filter 6, and is cooled by the oil cooler 5 before flowing back to the oil tank 1. The oil in the servo valve 14 and the pulse generator 15 is pressurized, filtered through the return oil filter 6, and then flows back to the oil cooler 5 for cooling before flowing back to the oil tank 1; 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 strength of not less than 1.5 times the test pressure.

[0027] The device of the present invention adopts a servo valve closed-loop control method and utilizes a pulse generator for high-frequency reciprocating operation to realize oil pressure control, water pressure control and frequency control, and realizes continuous fatigue testing of gas cylinders for 10,000 times. It is easy to operate, safe and reliable, and effectively verifies the influence of pressure changes of composite material gas cylinders on gas cylinder performance.

[0028] This embodiment also provides a test method for gas cylinder pulse high-pressure cycle, which is used for testing gas cylinder pulse high-pressure cycle, and the steps include: Step S1 : The hydraulic pump 19 pressurizes the pipeline and the gas cylinder 18 .

[0029] Step S2: The hydraulic power unit pressurizes the pulse generator 15 via the oil pump 4 .

[0030] Step S3: The servo valve 14 and the proportional pressure reducing valve 11 control the oil pressure of the pulse generator 15, and increase or reduce the pressure in the gas cylinder 18 according to the proportional relationship between the oil pressure of the pulse generator 15 and the hydraulic pressure.

[0031] Step S4: The oil is cooled by the oil cooler 5 and returns to the oil tank 1, and the oil circuit forms a closed loop.

[0032] Specifically: the test medium is pressurized and transported to the pulse generator 15 from the water tank 22 through the pneumatic diaphragm pump 20 and the hydraulic pump 19. Before the test, the hydraulic pump 19 needs to pressurize the gas cylinder 18 to a certain pressure alone. After reaching a certain pressure, the oil pressure continues to step-pressurize the test medium through the servo valve 14, and the frequency of the pressurization and the test pressure are controlled by the servo valve 14 electrical signal 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, and an oil circuit is formed through the pipeline and the manual overflow valve 8. After cooling by the oil cooler 5, the oil returns to normal temperature oil. An oil suction filter 3 and a high-pressure filter 7 are set at the inlet end of the oil circuit, and an oil return filter 6 is set on the return oil pipeline to ensure the cleanliness of the oil.

[0033] Preferably, the oil suction filter 3 and the high-pressure filter 7 can filter impurities in the oil in the oil tank 1 to prevent the impurities from affecting the accuracy of the proportional pressure reducing valve 11 and the servo valve 14.

[0034] Preferably, the pulse generator 15 and the servo valve 14 form a linkage control system, and the boost frequency is controlled by the electrical signal of the servo valve 14.

[0035] Preferably, the pulse generator 15 is divided into an oil cylinder and a water cylinder. The oil and water are squeezed with a certain pressure ratio. The low-pressure input of the oil cylinder controls the high-pressure output of the water cylinder. Preferably, in the pressure control of the proportional pressure reducing valve 11 , the output overpressure oil is controlled by the manual relief valve 8 , and when the pressure drops, the manual relief valve 8 discharges excess oil, thereby reducing the circulating pressure in the gas cylinder 18 .

[0036] Preferably, under the joint control of the pulse generator 15 and the servo valve 14 , the pulse pressure wave can form a plurality of sinusoidal waves, the waveform of which is stable and the error is small.

[0037] Preferably, the hydraulic pump 19 is an air-driven pump, and the gas cylinder 18 needs to be vented and the medium pre-pressurized by the hydraulic pump 19 before the oil pressure is increased.

[0038] The present invention implements pulsed pressure cycling for gas cylinders. It should be understood that in the description of this application, terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A test device for pulsed high-pressure circulation of gas cylinders, characterized in that: include: Hydraulic power unit, pressure pulse control device, liquid filling and exhaust 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, and 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 exhaust device is connected and water is injected into the water cylinder of the pulse generator (15); The pulse generator (15) oil 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 to each other. The upper and lower limits and frequency changes of the circulating pressure of the oil cylinder and the servo valve (14), and the circulating pressure and frequency of the driving gas cylinder (18); The oil in the servo valve (14) and the pulse generator (15) is pressurized and then flows back to the oil cooler (5) for cooling.

2. The gas cylinder pulse high pressure cycle test device according to claim 1, characterized in that: The hydraulic power unit further includes an oil tank (1), a temperature sensor (2), a manual overflow valve (8), and a one-way valve (9); The oil tank (1) stores hydraulic oil, the temperature sensor (2) is accommodated in the oil tank (1), and the oil in the oil tank (1) is pressurized by the oil pump (4); The oil circuits at the front and rear ends of the oil pump (4) are respectively provided with an oil suction filter (3) and a high-pressure filter (7); The front end of the one-way valve (9) is connected to the high-pressure filter (7), and the rear end extends to communicate with the proportional pressure reducing valve (11), and is connected in one direction from the front end to the rear end; The manual overflow valve (8) is connected between the one-way valve (9) and the high-pressure filter (7). The high-pressure oil is returned by the manual overflow valve (8) to reduce the pressure, filtered by the return oil filter (6), cooled by the oil cooler (5), and then flows back to the oil tank (1).

3. The gas cylinder pulse high pressure cycle test device according to claim 2, characterized in that: The liquid filling and exhaust device comprises a water tank (22), a water filter (21), a pneumatic diaphragm pump (20), and a hydraulic pump (19); The water tank (22) is provided with a liquid level transmitter; 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 deflation process; The hydraulic pump (19) applies basic pressure to the cylinder (18) by injecting water into the cylinder (18) and discharging air from the pipeline and the cylinder (18); The water filter (21) is arranged at the rear end of the water tank (22).

4. The gas cylinder pulse high pressure cycle test device according to claim 3, characterized in that: The pressure pulse control device further 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 in the gas cylinder (18), and feeds back a pressure signal; The unloading valve (17) is connected between the gas cylinder (18) and the pulse generator (15) to relieve the pressure of the gas cylinder (18); The first pressure sensor (12) and the second pressure sensor (13) are respectively arranged 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 reflux pressure reduction.

5. The gas cylinder pulse high pressure cycle test device 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 strength of not less than 1.5 times the test pressure.

6. The gas cylinder pulse high pressure cycle test device according to claim 1, characterized in that: The pressure cycle of the pulse generator (15) is a process of superimposing an alternating pressure source that changes regularly in a closed circulation loop with a constant base pressure. The lower limit pressure of the alternating pressure source is the same as the base pressure of the circulation system. The driving end pressure of the pulse generator (15) is controlled by a proportional pressure reducing valve (11), and the reversing valve of the pulse generator (15) controls the repeated pressurization of the pulse generator (15).

7. The gas cylinder pulse high pressure cycle test device according to claim 6, characterized in that: The servo valve (14) receives a front-end high-pressure oil source and controls the pulse generator (15) according to an electric control signal, so that the pulse generator (15) operates reciprocatingly at a high frequency according to a set value and outputs a variety of test waveforms, including sine, trapezoidal, and straight wave.

8. The gas cylinder pulse high pressure cycle test device according to claim 1, characterized in that: The maximum boost value of the oil pump (4) is not less than 25 MPa.

9. The gas cylinder pulse high pressure cycle test device according to claim 1, characterized in that: The servo valve (14) controls the action of the pulse generator (15). The servo valve (14) receives an electrical analog signal and outputs a modulated flow rate and pressure accordingly to drive the cyclic loading of the pulse generator (15).

10. A method for testing gas cylinder pulse high pressure cycles, using the gas cylinder pulse high pressure cycle testing device according to any one of claims 1 to 9, characterized in that the steps include: Step S1: The hydraulic pump (19) pressurizes the pipeline and the gas cylinder (18); Step S2: the hydraulic power unit pressurizes the pulse generator (15) via 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), and increase or reduce the pressure in the gas cylinder (18) according to the proportional relationship between the oil pressure of the pulse generator (15) and the hydraulic pressure; Step S4: The oil is cooled by the oil cooler (5) and returns to the oil tank (1), and the oil circuit forms a closed loop.

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