Automatic oil charging and discharging system and method for fatigue test of hydrogen storage cylinder

Abstract

The invention provides an automatic oil charging and discharging system for a fatigue test of a hydrogen storage cylinder. The automatic oil charging and discharging system solves the problems that in existing operation, the environment is dirty, efficiency is low, energy consumption is high, oil cleanliness is difficult to guarantee, and potential safety hazards exist. The clamping turnover mechanism comprises a base, a supporting track mechanism, a pneumatic clamping device and a turnover device; the climbing operation mechanism is a stepped platform and is used for adapting to the heights of openings of the gas cylinders with different lengths after the gas cylinders are vertically placed; the oil charging and discharging mechanism comprises an oil tank body, an oil charging module and an oil discharging module, the oil discharging module is located above the oil tank body, the oil outlet position of the oil tank body is connected with an oil suction port of the oil charging module, and an oil outlet of the oil charging module is connected with an oil injection gun; a filter screen is arranged at the oil outlet position of the oil drainage module and communicated with an inner cavity of the oil tank body.

Description

Technical Field

[0001] This invention relates to the technical field of high-pressure hydrogen storage cylinder testing, specifically to an automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders. Background Technology

[0002] Hydrogen storage cylinders with carbon fiber fully wound aluminum liner and pressure of 35MPa and above must undergo hydraulic fatigue testing before leaving the factory to verify their cycle life and safety. This test requires repeated filling and emptying of high-pressure hydraulic oil into the cylinder, which places extremely high demands on the cleanliness, efficiency, and safety of the filling and emptying operations.

[0003] The drawbacks of the existing purely manual method for fatigue testing of hydrogen storage cylinders: 1. The working environment is dirty and inefficient: the filling and draining of oil relies heavily on manual handling, pouring and pumping. Hydraulic oil is easy to spill and leak, resulting in serious oil pollution in the work area, which is difficult to clean. In addition, the slow pace of manual operation has become a bottleneck to production efficiency. 2. Energy waste and high cost: The oil discharge process usually uses electric pumps for extraction, which consumes electricity continuously; and because the oil is easily contaminated and not filtered thoroughly, it is often not reusable or has a low reuse rate, resulting in high cost of test oil. 3. Safety hazards and high labor intensity: Gas cylinders weigh hundreds of kilograms, and manual turning and climbing operations pose safety risks such as being crushed or slipping; frequent hoisting and tightening operations are labor-intensive and can easily lead to personnel fatigue and operational errors. 4. Difficulty in ensuring oil cleanliness: If contaminated hydraulic oil enters the fatigue testing machine or is injected into the gas cylinder to be tested, it may cause wear of precision parts of the testing equipment, fluctuations in test pressure, or even distortion of test results, seriously affecting the product quality assessment.

[0004] Therefore, there is an urgent need for an integrated, automated, environmentally friendly, and efficient oil filling and discharging equipment to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders, which solves the problems of environmental pollution, low efficiency, high energy consumption, difficulty in ensuring oil cleanliness, and potential safety hazards in existing operations.

[0006] An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders, characterized in that it comprises: The clamping and flipping mechanism includes a base, a support rail mechanism, a pneumatic clamping device, and a flipping device. The upper support frame of the base is pivotally connected to the bottom frame of the support rail mechanism via a rotating shaft. Rotating rods are arranged at intervals along the length of the central area of ​​the bottom frame. One end of the support rail mechanism is also provided with a support end plate, which is used to limit the non-oil filling end of the gas cylinder. A gantry frame is also provided on the bottom frame of the support rail mechanism. A pneumatic clamping device is fixed on the gantry frame. The conformal pressure claw of the pneumatic clamping device is arranged facing the gas cylinder on the upper surface of the bottom frame. The lower part of the bottom frame of the support rail mechanism is also connected to the output shaft of the flipping device. The output shaft of the flipping device drives the bottom frame to be arranged horizontally or vertically relative to the upper support frame. The aerial work mechanism is a stepped platform designed to accommodate the height of the cylinder opening when gas cylinders of different lengths are placed vertically. The oil filling and discharging mechanism includes an oil tank body, an oil filling module, and an oil discharging module. The oil discharging module is located above the oil tank body. The oil outlet of the oil tank body is connected to the oil inlet of the oil filling module. The oil outlet of the oil filling module is connected to an oil injection gun. The oil outlet of the oil discharging module is equipped with a filter screen and is connected to the inner cavity of the oil tank body.

[0007] Its further features are: The elevated working mechanism is equipped with clamping and flipping mechanisms and oil filling and discharging mechanisms on both sides. The top of the stepped platform of the elevated working mechanism is equipped with a working platform for placing tools. The stepped platform of the elevated working mechanism is equipped with insertion holes or clamps for fixing the oil gun when not in operation. The base includes several sets of column legs. The bottom frame of the support track mechanism is pivotally connected to the central empty area of ​​the upper support frame of the base via a rotating shaft. The support end plate and one end of the upper support frame have a gap. The gap ensures that the support track mechanism, gas cylinder, and pneumatic clamping device have room to flip and will not collide or interfere when flipped. The rotating shaft is arranged corresponding to the two side uprights of the gantry frame. One end of the rotating shaft passes through the corresponding side upright and is fitted with a limit sleeve. The limit sleeve ensures that the support track mechanism can only be rotated or reset 90° in one direction, ensuring that the gas cylinder will not be accidentally overturned. The bottom frame also includes reinforcing rods spaced apart along the length direction. The rotating surface of the rotating rod is located above the reinforcing rod, and its length direction does not interfere with the reinforcing rod. The arrangement of the reinforcing rods makes the strength of the entire support track mechanism stable and reliable. Each of the rotating rods has a contoured guide cone at both ends. The pair of contoured guide cones are used to center the gas cylinder and ensure that the gas cylinder is in a stable and reliable position. The bottom frame is also provided with a reinforcing connecting rod at the position corresponding to the output shaft of the flipping device, and the output shaft of the flipping device is fixed to the reinforcing connecting rod. The flipping device includes a mounting base and a linear drive mechanism. The lower end of the linear drive mechanism is pivotally connected to the support end of the mounting base. The fixed end of the mounting base is fixedly connected to the lower support beam of the base. The upper output shaft of the linear drive mechanism is pivotally connected to the corresponding position of the reinforcing connecting rod. The upper output shaft of the linear drive mechanism extends or retracts to drive the support track mechanism to be arranged horizontally or vertically on the upper support frame. The linear drive mechanism is a hydraulic cylinder or a motor reducer; The pneumatic clamping device includes a clamping cylinder and a contouring claw. The cylinder seat of the clamping cylinder is fixed to the crossbeam of the gantry frame, and the lower piston end of the clamping cylinder is fixed to the contouring claw. The contouring claw is used to contour-press onto the upper surface area of ​​the gas cylinder. The conformal pressure claw is a claw structure with a pair of V-shaped or arc-shaped grooves, which can be adapted to gas cylinders of different diameters. The oil filling module includes an electric oil pump, the oil suction port of which extends through a pipeline to the bottom of the inner cavity of the oil tank body, and the oil outlet of which is connected to an oil injection gun through a hose. The oil draining module includes at least one oil draining ramp, which is used to place the inclined gas cylinder. The oil draining module is provided with a low-end opening at the lower end corresponding to the oil draining ramp, and the low-end opening is connected to the inner cavity of the oil tank body. A high-mesh metal filter screen is installed at the lower opening position. The high-mesh metal filter screen is used to receive and filter the hydraulic oil poured out from the gas cylinder and intercept solid impurities.

[0008] An oil filling and draining method using the above system, characterized in that it includes an oil filling process a and an oil draining process b; the specific steps of the oil filling process a are as follows: Sa1 lifts the gas cylinder to be tested, with a plug already installed at one end, to the clamping and flipping mechanism and clamps it; Sa2 controls the tilting device to tilt the gas cylinder 90° to an upright position, with the open end facing upwards; Sa3 operators approach the bottle opening via the elevated work mechanism, insert the oil filling gun connected to the oil filling module into the bottle opening, and fill the bottle with oil. Sa4 automatically stops when full; remove the oil gun and put it back. Sa5 installs a fatigue test connector at the mouth of the gas cylinder, then flips the gas cylinder back to a horizontal position, releases the pneumatic clamping device, and hoists it to the fatigue test station; The specific steps of the oil draining process b are as follows: Sb1 hoists the gas cylinder that has completed the fatigue test to the clamping and turning mechanism and clamps it; Sb2 controls the flipping device to flip the gas cylinder 90° to an upright position, so that the end with the fatigue test connector is facing upwards; Sb3 screws the lifting ring into the fatigue test joint, hangs the lifting ring with the crane hook, then releases the pneumatic clamping device, and uses the crane to lift the upright gas cylinder to the position of the oil draining module, with the bottom plug end of the gas cylinder facing down; Sb4 unscrews the bottom plug, and the hydraulic oil inside the bottle naturally pours into the inner cavity of the oil tank body by gravity, and flows through the filter screen for coarse filtration; To completely empty the Sb5 cylinder, hang it upright again for a moment to drain any remaining oil. Sb6 hoists the empty bottle back to the tilting mechanism, clamps and secures it, removes the trolley hook and lifting ring, tilts it to a horizontal position, disassembles the fatigue test joint, and finally lifts it away.

[0009] By adopting the solution of this invention, the oil filling and draining operation is streamlined, cleaned, and resource-saving by integrating clamping and flipping, fixed-point oil filling, gravity oil draining, and circulating filtration functions; it solves the problems of environmental pollution, low efficiency, high energy consumption, difficulty in ensuring oil cleanliness, and safety hazards in existing operations. Attached Figure Description

[0010] Figure 1 Three-dimensional representation of a specific embodiment of the present invention Figure 1 ; Figure 2 Three-dimensional representation of a specific embodiment of the present invention Figure 2 ; Figure 3 This is a perspective view of the clamping and flipping mechanism of the present invention; Figure 4 This is a front view of the clamping and flipping mechanism of the present invention; Figure 5 This is a rear view of the clamping and flipping mechanism of the present invention; Figure 6 for Figure 4 A schematic diagram of the AA cross-section structure; The names corresponding to the serial numbers in the diagram are as follows: Clamping and turning mechanism 100, high-altitude operation mechanism 200, oil filling and discharging mechanism 300, gas cylinder 400, bottom plug 401, fatigue test joint 402; Base 10, upper support frame 11, column support leg 12, support track mechanism 20, gap 201, bottom frame 21, rotating rod 22, support end plate 23, reinforcing rod 24, contour guide cone 25, reinforcing connecting rod 26, pneumatic clamping device 30, contour pressure claw 31, clamping cylinder 32, flipping device 40, mounting base 41, linear drive mechanism 42, rotating shaft 50, gantry frame 60, side upright plate 61, crossbeam 62, stepped platform 70, working platform 71, oil tank body 80, oil filling module 90, oil injection gun 91, electric oil pump 92, hose 93, oil draining module 110, filter screen 111, oil draining ramp 112, low end opening 113, limit sleeve 120.

[0011] Fuel tank body 80 Detailed Implementation

[0012] An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders, see [link to documentation]. Figures 1-6 It includes a clamping and turning mechanism 100, an elevated operation mechanism 200, and an oil filling and discharging mechanism 300; The clamping and flipping mechanism 100 includes a base 10, a support rail mechanism 20, a pneumatic clamping device 30, and a flipping device 40. The upper support frame 11 of the base 10 is pivotally connected to the bottom frame 21 of the support rail mechanism 20 via a rotating shaft 50. Rotating rods 22 are arranged at intervals along the length direction in the central area of ​​the bottom frame 21. A support end plate 23 is also provided at one end of the support rail mechanism 20. The support end plate 23 is used to limit the non-oil filling end of the gas cylinder 400. A gantry frame 60 is also provided on the bottom frame 21 of the support rail mechanism 20. A pneumatic clamping device 30 is fixed on the gantry frame 60. The conformal pressure claw 31 of the pneumatic clamping device 30 is arranged facing the gas cylinder 400 on the upper surface of the bottom frame 21. The lower part of the bottom frame 21 of the support rail mechanism 20 is also connected to the output shaft of the flipping device 40. The output shaft of the flipping device 40 drives the bottom frame 21 to be arranged horizontally or vertically relative to the upper support frame 11. The aerial work mechanism 200 is a stepped platform 70, used to adapt to the height of the cylinder opening after the gas cylinders 400 of different lengths are placed vertically. The oil filling and discharging mechanism 300 includes an oil tank body 80, an oil filling module 90, and an oil discharging module 110. The oil discharging module 110 is located above the oil tank body 80. The oil outlet of the oil tank body 80 is connected to the oil suction port of the oil filling module 90. The oil outlet of the oil filling module 90 is connected to an oil injection gun 91. The oil outlet of the oil discharging module 110 is provided with a filter screen 111 and is connected to the inner cavity of the oil tank body 80.

[0013] In a specific embodiment, the applicable gas cylinder 400 is provided with a bottom plug 401 and a fatigue test joint 402 at both ends of its length direction; The elevated operation mechanism 200 is provided with clamping and flipping mechanisms 100 and oil filling and discharging mechanisms 300 on both sides. The top of the stepped platform 70 of the elevated operation mechanism 200 is provided with an operation platform 71 for placing tools. The stepped platform 70 of the elevated operation mechanism is provided with a socket or clamp for fixing the oil gun 91 when not in operation.

[0014] In a specific embodiment, the base 10 includes several sets of column supports 12. The bottom frame 21 of the support track mechanism 20 is pivotally connected to the central empty area of ​​the upper support frame 11 of the base 10 via a pivot shaft 50. The support end plate 23 and one end of the upper support frame 11 have a gap 201. The gap 201 ensures that the support track mechanism 20, gas cylinder 400 and pneumatic clamping device 30 have room to flip and will not collide or interfere when they are flipped.

[0015] In a specific embodiment, the rotating shaft 50 is arranged corresponding to the two side uprights 61 of the gantry frame 60. One end of the rotating shaft 50 passes through the corresponding side upright 61 and is fitted with a limiting sleeve 120. The limiting sleeve 120 ensures that the support track mechanism 20 can only be rotated or reset 90° in one direction, so as to ensure that the gas cylinder 400 will not be accidentally rotated.

[0016] In a specific embodiment, the bottom frame 21 further includes reinforcing rods 24 spaced apart along the length direction. The rotating surface of the rotating rod 22 is located above the reinforcing rod 24, and its length direction does not interfere with the reinforcing rod 24. The arrangement of the reinforcing rods 24 makes the strength of the entire support track mechanism 20 stable and reliable. Each of the rotating rods 22 has a contoured guide cone 25 at both ends. The pair of contoured guide cones 25 are used to center the gas cylinder 400 and ensure that the position of the gas cylinder 400 is stable and reliable. The bottom frame 21 is also provided with a reinforcing connecting rod 26 at the position corresponding to the output shaft of the flipping device 40, and the output shaft of the flipping device 40 is fixed to the reinforcing connecting rod 26.

[0017] In a specific embodiment, the flipping device 40 includes a mounting base 41 and a linear drive mechanism 42. The lower end of the linear drive mechanism 42 is pivotally connected to the support end of the mounting base 41, and the fixed end of the mounting base 41 is fixedly connected to the lower support beam of the base 10. The upper output shaft of the linear drive mechanism 42 is pivotally connected to the corresponding position of the reinforcing connecting rod 26. The upper output shaft of the linear drive mechanism 42 extends or retracts, driving the support track mechanism 20 to be arranged horizontally or vertically on the upper support frame 11. In a specific implementation, the linear drive mechanism 42 is a hydraulic cylinder or a motor reducer.

[0018] In a specific embodiment, the pneumatic clamping device 30 includes a clamping cylinder 32 and a conforming clamping claw 31. The cylinder seat of the clamping cylinder 32 is fixedly mounted to the crossbeam 62 of the gantry frame 60, and the lower piston end of the clamping cylinder 32 is fixedly connected to the conforming clamping claw 31. The conforming clamping claw 31 is used to conformally press onto the upper surface area of ​​the gas cylinder 400. In specific implementation, the conforming clamping claw 31 is a claw structure with a pair of V-shaped or arc-shaped grooves, which can be adapted to gas cylinders 400 of different diameters.

[0019] In a specific embodiment, the oil filling module 90 includes an electric oil pump 92. The oil suction port of the electric oil pump 92 extends to the bottom of the inner cavity of the oil tank body 80 through a pipeline, and the oil outlet of the electric oil pump 92 is connected to the oil injection gun 91 through a hose 93.

[0020] In a specific embodiment, the oil draining module 110 includes two parallel oil draining ramps 112, which have a V-shaped structure. The oil draining ramps 112 are used to place the inclined gas cylinders 400. The lower end of the oil draining module 110 corresponding to the oil draining ramps 112 is provided with a low-end opening 113, which is connected to the inner cavity of the oil tank body 80. A filter screen 111 is provided at the low-end opening 113. The filter screen 111 is a high-mesh metal filter screen (200 mesh). The high-mesh metal filter screen is used to receive and filter the hydraulic oil poured out from the gas cylinder 400 and intercept solid impurities.

[0021] In practice, the flipping device 40 is driven by a hydraulic cylinder or a motor reducer, so that the clamped gas cylinder 400 can be smoothly and accurately switched between horizontal and vertical (90° flipping) states, and has a self-locking function to ensure safe stopping at any angle. The design bearing capacity and flipping torque can meet the operation requirements of gas cylinders up to 3m long.

[0022] The oil tank body 80 is a sealed rectangular structure, which stores test hydraulic oil for circulation. The capacity can be designed according to requirements (e.g., 2m³). 3 ); The outlet pipe of the electric oil pump 92 of the oil filling module 90 or the inside of the oil tank body 80 is equipped with a precision filter (such as 5μm level) to ensure the cleanliness of the pumped oil.

[0023] The oil tank body 80, electric oil pump 92, precision filter and pipeline together constitute a closed-loop circulation system for hydraulic oil, which is "filling-recovery-filtration-refilling".

[0024] An oil filling and draining method using the above system includes an oil filling process a and an oil draining process b; The specific steps of the oil filling process a are as follows: Sa1 lifts the gas cylinder to be tested, with a plug already installed at one end, to the clamping and flipping mechanism and clamps it; Sa2 controls the tilting device to tilt the gas cylinder 90° to an upright position, with the open end facing upwards; Sa3 operators approach the bottle opening via the elevated work mechanism, insert the oil filling gun connected to the oil filling module into the bottle opening, and fill the bottle with oil. Sa4 automatically stops when full; remove the oil gun and put it back. Sa5 installs a fatigue test connector at the mouth of the gas cylinder, then flips the gas cylinder back to a horizontal position, releases the pneumatic clamping device, and hoists it to the fatigue test station; The specific steps of the oil draining process b are as follows: Sb1 hoists the gas cylinder that has completed the fatigue test to the clamping and turning mechanism and clamps it; Sb2 controls the flipping device to flip the gas cylinder 90° to an upright position, so that the end with the fatigue test connector is facing upwards; Sb3 screws the lifting ring into the fatigue test joint, hangs the lifting ring with the crane hook, then releases the pneumatic clamping device, and uses the crane to lift the upright gas cylinder to the position of the oil draining module, with the bottom plug end of the gas cylinder facing down; Sb4 unscrews the bottom plug, and the hydraulic oil inside the bottle naturally pours into the inner cavity of the oil tank body by gravity, and flows through the filter screen for coarse filtration; To completely empty the Sb5 cylinder, hang it upright again for a moment to drain any remaining oil. Sb6 hoists the empty bottle back to the tilting mechanism, clamps and secures it, removes the trolley hook and lifting ring, tilts it to a horizontal position, disassembles the fatigue test joint, and finally lifts it away.

[0025] Compared with the prior art, the present invention has the following significant advantages: Improved work efficiency and cleanliness: The clamping and flipping mechanism enables rapid and stable conversion of the cylinder's posture. Combined with fixed-point high-altitude operations and a dedicated oil tank, the filling and discharging process is streamlined and zoned, completely avoiding disorderly oil spillage, maintaining a clean working environment, and significantly improving overall work efficiency. Significantly reduces energy consumption and operating costs: The oil discharge process innovatively adopts gravity natural tilting as the main method, replacing the traditional full-process pumping, which greatly saves electricity consumption. At the same time, the closed-loop oil filtration and circulation system allows hydraulic oil to be reused multiple times, which greatly reduces the procurement cost of expensive test oil and the cost of waste oil disposal. Ensuring test safety and result reliability: The systematic operation process reduces the arbitrariness of manual intervention and lowers the safety risks of heavy lifting and high-altitude operations. Multi-stage filtration (5μm pre-pump filtration and 200-mesh tilting filtration) ensures the high cleanliness of the circulating oil, effectively preventing test equipment failure and test data distortion caused by oil contamination, and ensuring the accuracy of fatigue testing and the reliability of gas cylinder product quality evaluation. Improved ergonomics and reduced labor intensity: The dedicated elevated work platform and tool storage area make operation more convenient and labor-saving. Mechanized clamping and flipping replace heavy manual handling, reducing the labor intensity of operators.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders, characterized in that, It includes: The clamping and flipping mechanism includes a base, a support rail mechanism, a pneumatic clamping device, and a flipping device. The upper support frame of the base is pivotally connected to the bottom frame of the support rail mechanism via a rotating shaft. Rotating rods are arranged at intervals along the length of the central area of ​​the bottom frame. One end of the support rail mechanism is also provided with a support end plate, which is used to limit the non-oil filling end of the gas cylinder. A gantry frame is also provided on the bottom frame of the support rail mechanism. A pneumatic clamping device is fixed on the gantry frame. The conformal pressure claw of the pneumatic clamping device is arranged facing the gas cylinder on the upper surface of the bottom frame. The lower part of the bottom frame of the support rail mechanism is also connected to the output shaft of the flipping device. The output shaft of the flipping device drives the bottom frame to be arranged horizontally or vertically relative to the upper support frame. The aerial work mechanism is a stepped platform designed to accommodate the height of the cylinder opening when gas cylinders of different lengths are placed vertically. The oil filling and discharging mechanism includes an oil tank body, an oil filling module, and an oil discharging module. The oil discharging module is located above the oil tank body. The oil outlet of the oil tank body is connected to the oil inlet of the oil filling module. The oil outlet of the oil filling module is connected to an oil injection gun. The oil outlet of the oil discharging module is equipped with a filter screen and is connected to the inner cavity of the oil tank body.

2. The automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 1, characterized in that: The elevated operation mechanism is equipped with clamping and flipping mechanisms and oil filling and discharging mechanisms on both sides. The top of the stepped platform of the elevated operation mechanism is equipped with an operation platform for placing tools. The stepped platform of the elevated operation mechanism is equipped with insertion holes or clamps for fixing the oil injection gun when not in operation.

3. The automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 1, characterized in that: The base includes several sets of column supports. The bottom frame of the support track mechanism is pivotally connected to the central empty area of ​​the upper support frame of the base via a pivot. There is a gap between the support end plate and one end of the upper support frame. The gap ensures that the support track mechanism, gas cylinder, and pneumatic clamping device have room to flip and will not collide or interfere when they are flipped.

4. An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 3, characterized in that: The rotating shaft is arranged corresponding to the two side uprights of the gantry frame. One end of the rotating shaft passes through the corresponding side upright and is fitted with a limiting sleeve. The limiting sleeve allows the support track mechanism to only rotate or reset 90° in one direction.

5. An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 3, characterized in that: The bottom frame also includes reinforcing rods spaced apart along the length direction. The rotating surface of the rotating rod is located above the reinforcing rod, and its length direction does not interfere with the reinforcing rod.

6. An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 3, characterized in that: The bottom frame is also provided with a reinforcing connecting rod at the position corresponding to the output shaft of the flipping device; The flipping device includes a mounting base and a linear drive mechanism. The lower end of the linear drive mechanism is pivotally connected to the support end of the mounting base. The fixed end of the mounting base is fixedly connected to the lower support beam of the base. The upper output shaft of the linear drive mechanism is pivotally connected to the corresponding position of the connecting reinforcing rod. The upper output shaft of the linear drive mechanism extends or retracts to drive the support track mechanism to be arranged horizontally or vertically on the upper support frame.

7. An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 1, characterized in that: The pneumatic clamping device includes a clamping cylinder and a contouring claw. The cylinder seat of the clamping cylinder is fixed to the crossbeam of the gantry frame, and the lower piston end of the clamping cylinder is fixed to the contouring claw. The contouring claw is used to contour-press onto the upper surface area of ​​the gas cylinder.

8. An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 1, characterized in that: The oil filling module includes an electric oil pump, the oil suction port of which extends through a pipeline to the bottom of the inner cavity of the oil tank body, and the oil outlet of which is connected to an oil injection gun through a hose.

9. An automated oil filling and discharging system for fatigue testing of hydrogen storage cylinders according to claim 1, characterized in that: The oil draining module includes at least one oil draining ramp, which is used to place the inclined gas cylinder. The oil draining module is provided with a low-end opening at the lower end corresponding to the oil draining ramp, and the low-end opening is connected to the inner cavity of the oil tank body. A high-mesh metal filter screen is provided at the low-end opening position.

10. A method for filling and draining oil using the above system, characterized in that, It includes an oil filling process a and an oil draining process b; the specific steps of the oil filling process a are as follows: Sa1 lifts the gas cylinder to be tested, with a plug already installed at one end, to the clamping and flipping mechanism and clamps it; Sa2 controls the tilting device to tilt the gas cylinder 90° to an upright position, with the open end facing upwards; Sa3 operators approach the bottle opening via the elevated work mechanism, insert the oil filling gun connected to the oil filling module into the bottle opening, and fill the bottle with oil. Sa4 automatically stops when full; remove the oil gun and put it back. Sa5 installs a fatigue test connector at the mouth of the gas cylinder, then flips the gas cylinder back to a horizontal position, releases the pneumatic clamping device, and hoists it to the fatigue test station; The specific steps of the oil draining process b are as follows: Sb1 hoists the gas cylinder that has completed the fatigue test to the clamping and turning mechanism and clamps it; Sb2 controls the flipping device to flip the gas cylinder 90° to an upright position, so that the end with the fatigue test connector is facing upwards; Sb3 screws the lifting ring into the fatigue test joint, hangs the lifting ring with the crane hook, then releases the pneumatic clamping device, and uses the crane to lift the upright gas cylinder to the position of the oil draining module, with the bottom plug end of the gas cylinder facing down; Sb4 unscrews the bottom plug, and the hydraulic oil inside the bottle naturally pours into the inner cavity of the oil tank body by gravity, and flows through the filter screen for coarse filtration; To completely empty the Sb5 cylinder, hang it upright again for a moment to drain any remaining oil. Sb6 hoists the empty bottle back to the tilting mechanism, clamps and secures it, removes the trolley hook and lifting ring, tilts it to a horizontal position, disassembles the fatigue test joint, and finally lifts it away.

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