An apparatus and method for preparing low-disturbance post-fire samples of high-pressure hydrogen storage structures

Abstract

This invention discloses a device and method for preparing low-disturbance post-fire samples of high-pressure hydrogen storage structures, belonging to the field of fire safety testing. The device includes a base plate, a first side plate and a second side plate fixedly disposed on both sides of the base plate, with a threaded rod rotatably connected between the first and second side plates; a slider threadedly connected to the threaded rod, with a bearing plate fixedly connected to the slider, and a motor mounted on the bearing plate, the output end of which is connected to a cutting wheel; a conveying cylinder fixedly disposed on the outer wall of the first side plate, with a rack plate slidably connected inside the conveying cylinder, and a connecting shaft at the end of the threaded rod outside the first side plate, the connecting shaft having a gear meshing with the rack plate; and a limiting frame fixedly connected to the second side plate. This invention can maximally preserve the original interlayer delamination, interface debonding, and other fire damage states of the composite hydrogen storage structure, significantly improving the accuracy and reliability of post-fire performance evaluation results.

Description

Technical Field

[0001] This invention relates to the field of fire safety testing technology, and in particular to a device and method for preparing low-disturbance post-fire samples of high-pressure hydrogen storage structures. Background Technology

[0002] With the rapid development of the hydrogen energy storage and transportation industry, Type III and Type IV high-pressure composite hydrogen storage containers have become core equipment in the hydrogen energy supply system. Their structural safety and remaining service performance under fire conditions are core issues of concern to the industry. Conducting interface damage characterization and remaining load-bearing capacity testing of composite hydrogen storage structures after fire thermal exposure is a key foundation for the fire-resistant safety design, material selection, structural optimization, and service reliability assessment of hydrogen storage containers. Obtaining standard test specimens that can truly preserve the original damage state after fire is a prerequisite for ensuring the accuracy and reliability of the evaluation results.

[0003] Current research on the post-fire performance of composite hydrogen storage structures often employs conventional machining methods for sample preparation. This involves cutting standard-sized samples from a burned motherboard using processes such as abrasive wheel cutting. However, composite hydrogen storage structures exposed to fire exhibit characteristics such as resin matrix carbonization, decreased interfacial bonding between the metal or polymer liner and the carbon fiber composite layer, and deterioration of interlayer strength. Conventional preparation methods have significant drawbacks: the conventional rigid clamping and vertical feeding cutting method applies additional compressive stress and shear impact to the sample, easily causing additional interlayer delamination and detachment of the liner or composite layer interface during the cutting process. This disrupts the original damage state caused by the fire, leading to distorted subsequent damage characterization and mechanical testing results, failing to accurately reflect the deterioration pattern of the structure caused by the fire. Therefore, this invention is proposed. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a device and method for preparing low-disturbance post-fire samples of high-pressure hydrogen storage structures.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A post-fire low-disturbance sample preparation apparatus for a high-pressure hydrogen storage structure includes a base plate and further includes: A first side plate and a second side plate are fixedly installed on both sides of the base plate, and a threaded rod is rotatably connected between the first side plate and the second side plate. A slider is threadedly connected to a threaded rod. A bearing plate is fixedly connected to the slider. A motor is mounted on the bearing plate. A cutting grinding wheel is connected to the output end of the motor. A conveying cylinder is fixedly installed on the outer wall of the first side plate. A rack plate is slidably connected inside the conveying cylinder. A connecting shaft is provided at one end of the threaded rod outside the first side plate. A gear that meshes with the rack plate is provided on the connecting shaft. An air collecting assembly for supplying air to the conveying cylinder is provided on the bearing plate. The limiting frame is fixedly connected to the second side plate.

[0006] Preferably, the gas collection assembly includes a gas collection cylinder and a push plate slidably connected to the gas collection cylinder. A support plate is fixedly connected to the outer wall of the bearing plate. The gas collection cylinder is fixedly connected above the bearing plate through the support plate. A guide rod is also fixedly connected between the first side plate and the second side plate. The slider is slidably connected to the guide rod.

[0007] Furthermore, a first piston is slidably connected inside the gas collecting cylinder, and a push rod is fixedly connected to the outer wall of the first piston. One end of the push rod passes through the gas collecting cylinder through the first piston and is fixedly connected to the push plate. The output end of the motor is connected to an output shaft, and the cutting wheel is connected to the output shaft. A cam corresponding to the push plate is provided on the outer wall of the output shaft.

[0008] Furthermore, the outer wall of the gas collecting cylinder is also provided with a delivery pipe and an air inlet pipe, both of which are equipped with one-way valves. The end of the delivery pipe away from the gas collecting cylinder is connected to the delivery cylinder. A spring is provided between the first piston and the inner wall of the gas collecting cylinder, and the spring is sleeved on the outer wall of the push rod.

[0009] Furthermore, a second piston is slidably connected inside the conveying cylinder, the rack plate is fixedly connected to the second piston, and a pressure relief valve is provided on the outer wall of the conveying cylinder.

[0010] Furthermore, a hook is fixedly connected to the outer wall of the first side plate, and a groove is provided on the first side plate. The end of the conveying pipe away from the gas collecting cylinder passes through the groove and is hooked on the hook.

[0011] Furthermore, a support block is fixedly installed on the outer wall of the first side plate, and the conveying cylinder is connected to the support block. After the gas in the gas collecting cylinder enters the inside of the conveying cylinder through the conveying pipe, it will push the second piston to drive the rack plate to move.

[0012] Preferably, a connecting rod is fixedly connected to the second side plate, the limiting frame is fixedly connected to the connecting rod, an installation frame is slidably connected inside the limiting frame, and a pressure plate is slidably connected inside the installation frame.

[0013] Furthermore, elastic elements are provided between the inner walls on both sides of the limiting frame and the mounting frame, and multiple long grooves are provided on the limiting frame. A locking screw is rotatably connected to the pressure plate, and the locking screw is threadedly connected to the mounting frame. A limiting rod is fixedly connected to the top outer wall of the mounting frame, and both the locking screw and the limiting rod are slidably connected in the long grooves.

[0014] A method for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure comprises the following steps: Step 1: Install the composite hydrogen storage structure to be prepared after fire thermal exposure into the limiting frame to fix it in place; Step 2: Start the motor mounted on the support plate, which will drive the cutting wheel at the output end to start rotating; Step 3: When the motor is working, it will drive the gas collection component to work and continuously deliver gas into the conveying cylinder; Step four: Push the rack plate inside the conveyor cylinder to start moving and meshing with the gear, which will drive the connecting shaft and threaded rod to start rotating; Step 5: The threaded rod drives the slider connected to it to move, which in turn drives the support plate and the motor to move, controlling the cutting wheel to approach the hydrogen storage structure installed in the limiting frame and continuously complete the cutting effect to achieve the preparation purpose.

[0015] Compared with the prior art, the present invention provides an apparatus and method for preparing low-disturbance post-fire samples of high-pressure hydrogen storage structures, which has the following beneficial effects: 1. The high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device, by starting the motor, can directly drive the cutting wheel at the output end to rotate, achieving the subsequent preparation effect. On the other hand, when the motor is working, it can drive the gas collection component through the cam to complete the gas collection operation, thereby conveying it into the inside of the conveying cylinder through the conveying pipe. This pushes the rack plate inside the conveying cylinder to start moving and meshing with the gear, driving the connecting shaft and threaded rod to start rotating. The threaded rod drives the slider connected to it to move, thereby driving the bearing plate and the motor to start moving, controlling the cutting wheel to approach the hydrogen storage structure installed in the limiting frame and continuously complete the cutting effect to achieve the preparation purpose.

[0016] 2. The high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device first inserts the hydrogen storage structure to be prepared and cut into the installation frame when installing the hydrogen storage structure. Then, the locking screw is rotated to drive the pressure plate to move downward, pressing the hydrogen storage structure plate between the pressure plate and the inner wall of the installation frame to complete the fixation. Moreover, the setting of the elastic element can avoid rigid cutting between the cutting wheel and the hydrogen storage structure, thus improving the stability of the cutting.

[0017] The parts of this device not covered are the same as or can be implemented using existing technologies. This invention, through a low-stress clamping and low-disturbance cutting process adapted to the composite structure characteristics after fire thermal exposure, avoids applying additional compressive stress and shear impact to the sample during the preparation process. It can preserve the original interlayer delamination, interface debonding and other fire damage states of the composite hydrogen storage structure to the maximum extent, significantly improving the accuracy and reliability of post-fire performance evaluation results. It can provide a reliable sample basis for the fire-resistant safety design, material selection and service reliability analysis of high-pressure hydrogen storage containers. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of a high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device proposed in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device proposed in this invention. Figure 2 ; Figure 3 This is a cross-sectional schematic diagram of the conveying cylinder in a high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device proposed in this invention. Figure 4 This is a schematic diagram of the gas collection component in a high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device proposed in this invention. Figure 5 This is a cross-sectional schematic diagram of the gas collecting cylinder in a high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device proposed in this invention. Figure 6 This invention proposes a device for preparing low-disturbance post-fire samples of high-pressure hydrogen storage structures. Figure 5 An enlarged schematic diagram of part A in the middle; Figure 7 This is a schematic diagram of the limiting frame in the high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device proposed in this invention; Figure 8 This is a cross-sectional schematic diagram of the limiting frame in a high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device proposed in this invention.

[0019] In the diagram: 1. Base plate; 101. First side plate; 102. Second side plate; 103. Groove; 2. Threaded rod; 201. Guide rod; 202. Slider; 203. Bearing plate; 204. Motor; 205. Output shaft; 206. Cutting wheel; 207. Cam; 3. Air collecting cylinder; 301. First piston; 302. Push rod; 303. Push plate; 304. Spring; 305. Support plate; 306. Conveying pipe; 307. Air inlet pipe; 4. Conveying cylinder; 401. Second piston; 402. Rack plate; 403. Connecting shaft; 404. Gear; 405. Support block; 406. Pressure relief valve; 407. Hook; 5. Limiting frame; 501. Mounting frame; 502. Elastic element; 503. Pressure plate; 504. Long groove; 505. Locking screw; 506. Limiting rod; 507. Connecting rod. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0022] Example 1: Refer to Figures 1-8 A high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device includes a base plate 1, and a first side plate 101 and a second side plate 102 fixedly disposed on both sides of the base plate 1. A threaded rod 2 is rotatably connected between the first side plate 101 and the second side plate 102. A slider 202 is threadedly connected to the threaded rod 2, and a bearing plate 203 is fixedly connected to the slider 202. A motor 204 is provided on the bearing plate 203, and a cutting wheel 206 is connected to the output end of the motor 204. A conveying cylinder 4 is fixedly disposed on the outer wall of the first side plate 101. A rack plate 402 is slidably connected inside the conveying cylinder 4. A connecting shaft 403 is provided at one end of the threaded rod 2 outside the first side plate 101. A gear 404 meshing with the rack plate 402 is provided on the connecting shaft 403. A gas collecting assembly for supplying gas to the conveying cylinder 4 is provided on the bearing plate 203. A limiting frame 5 is fixedly connected to the second side plate 102.

[0023] In this embodiment, during use, the composite hydrogen storage structure to be prepared after fire thermal exposure is first installed in the limiting frame 5 to fix it in place. Then, the motor 204, which is mounted on the support plate 203, is started, causing the cutting wheel 206 at the output end to rotate. Simultaneously, when the motor 204 is working, it drives the gas collection assembly to work, thereby causing the gas collection assembly to transport gas into the conveying cylinder 4. This pushes the rack plate 402 inside the conveying cylinder 4 to move. The rack plate 402 then meshes with the gear 404 connected to the connecting shaft 403, thereby driving the connecting shaft 403 to rotate through the gear 404. This causes the threaded rod 2 to start rotating. At this time, the slider 202, which is threadedly connected to the threaded rod 2, will start to move, thereby driving the support plate 203 and the motor 204 connected to the support plate 203 to move. This, in turn, drives the cutting wheel 206 connected to the motor 204 to move closer to the hydrogen storage structure installed in the limiting frame 5. When the cutting wheel 206 contacts it, a cutting effect is produced, thereby achieving the cutting effect on the hydrogen storage structure. Furthermore, through the set gas collection component, gas can be slowly delivered into the conveying cylinder 4, thereby achieving a slow cutting effect and avoiding damage to the hydrogen storage structure caused by continuous vertical feeding, which would affect subsequent use.

[0024] Reference Figures 1-6The gas collection assembly includes a gas collection cylinder 3 and a push plate 303 slidably connected to the gas collection cylinder 3. A support plate 305 is fixedly connected to the outer wall of the bearing plate 203. The gas collection cylinder 3 is fixedly connected to the top of the bearing plate 203 through the support plate 305. A guide rod 201 is also fixedly connected between the first side plate 101 and the second side plate 102. The slider 202 is slidably connected to the guide rod 201.

[0025] Reference Figures 1-6 A first piston 301 is slidably connected inside the air collecting cylinder 3. A push rod 302 is fixedly connected to the outer wall of the first piston 301. One end of the push rod 302 passes through the air collecting cylinder 3 and is fixedly connected to the push plate 303. The output end of the motor 204 is connected to the output shaft 205. The cutting wheel 206 is connected to the output shaft 205. A cam 207 corresponding to the push plate 303 is provided on the outer wall of the output shaft 205.

[0026] Reference Figures 1-6 The outer wall of the gas collecting cylinder 3 is also provided with a conveying pipe 306 and an air inlet pipe 307. Both the conveying pipe 306 and the air inlet pipe 307 are provided with one-way valves. The end of the conveying pipe 306 away from the gas collecting cylinder 3 is connected to the conveying cylinder 4. A spring 304 is provided between the first piston 301 and the inner wall of the gas collecting cylinder 3. The spring 304 is sleeved on the outer wall of the push rod 302.

[0027] A second piston 401 is slidably connected inside the conveying cylinder 4, and a rack plate 402 is fixedly connected to the second piston 401. A pressure relief valve 406 is provided on the outer wall of the conveying cylinder 4.

[0028] In this application, when the motor 204 is started, the motor 204 drives its output shaft 205 to rotate, thereby driving the cutting wheel 206 to rotate, thus facilitating the subsequent cutting operation. At the same time, when the output shaft 205 rotates, it also drives the cam 207 to rotate. When the cam 207 rotates, it contacts the push plate 303, thereby driving the first piston 301 to move through the push rod 302. When the first piston 301 moves, it squeezes the gas in the gas collecting cylinder 3, thereby squeezing it into the conveying pipe 306, and then into the conveying cylinder 4 through the conveying pipe 306. Along with the gas between the second piston 401 and its inner wall in the conveying cylinder 4, As the flow gradually increases, it slowly pushes the second piston 401 to move, which in turn drives the rack plate 402 to move, making it mesh with the gear 404 on the connecting shaft 403. This causes the gear 404 to rotate, which in turn drives the threaded rod 2 to rotate through the connecting shaft 403. When the threaded rod 2 rotates, it will be threadedly connected to the slider 202, which in turn causes the slider 202 to drive the bearing plate 203 to move, which in turn causes the motor 204 to drive the cutting wheel 206 to move. As the cutting wheel 206 moves, it gradually completes the cutting of the hydrogen storage structure, achieving a slow-feed cutting effect and improving the stability of the cutting.

[0029] Furthermore, in this application, both the delivery pipe 306 and the air inlet pipe 307 are equipped with one-way valves. Therefore, when the first piston 301 moves deeper into the air collecting cylinder 3, the compressed gas will enter the delivery pipe 306 through the one-way valve. The one-way valve on the air inlet pipe 307 only allows gas to enter the air collecting cylinder 3 through the air inlet pipe 307, and will not allow gas to be discharged through this pipe. When the cam 207 continues to rotate until it loses pressure on the push plate 303, the first piston 301 can automatically reset under the action of the spring 304. During the reset process of the first piston 301... Gas is drawn in through the intake pipe 307, allowing external gas to re-enter the gas collecting cylinder 3 through the intake pipe 307. When the cam 207 contacts the push plate 303 again, it can push the first piston 301 to move again, squeezing the gas into the delivery pipe 306. This reciprocating operation allows gas to continuously enter the delivery cylinder 4, thereby pushing the second piston 401 to drive the rack plate 402 to continuously feed, thereby driving the motor 204 to drive the cutting wheel 206 to continuously feed, thus completing the cutting operation and protecting the hydrogen storage structure during cutting.

[0030] In this application, a pressure relief valve 406 is also provided on the outer wall of the conveying cylinder 4. After the cutting is completed, the motor 204 is turned off. At this time, the pressure relief valve 406 is manually opened, which allows the gas inside the conveying cylinder 4 to be discharged through the pressure relief valve 406. At this time, the rack plate 402 can be pushed, which drives the second piston 401 to move into the conveying cylinder 4, thereby resetting the components inside the conveying cylinder 4. At the same time, the rack plate 402 will drive the gear 404 to rotate in the opposite direction, thereby driving the connecting shaft 403 to rotate in the opposite direction, causing the threaded rod 2 to rotate in the opposite direction, thereby driving the slider 202 and the bearing plate 203 to move in the opposite direction and reset, so that the motor 204 moves to the initial position, which can facilitate the next operation.

[0031] Reference Figure 2 and Figure 3 A hook 407 is fixedly connected to the outer wall of the first side plate 101. A groove 103 is provided on the first side plate 101. The end of the conveying pipe 306 away from the gas collecting cylinder 3 passes through the groove 103 and is hooked on the hook 407.

[0032] Reference Figures 1-6 A support block 405 is fixedly installed on the outer wall of the first side plate 101. The conveying cylinder 4 is connected to the support block 405. After the gas in the gas collecting cylinder 3 enters the interior of the conveying cylinder 4 through the conveying pipe 306, it will push the second piston 401 to drive the rack plate 402 to move.

[0033] In this embodiment, the length of the conveying pipe 306 is set to be relatively long. When the bearing plate 203 moves, it will drive the air collecting cylinder 3 to move, thereby reserving space for the conveying pipe 306 to move. The groove 103 is set to make it easy to place the conveying pipe 306. The hook 407 is to support the conveying pipe 306. The support block 405 can support the conveying cylinder 4 to make it stable for installation.

[0034] Example 2: Refer to Figures 1-8 A high-pressure hydrogen storage structure post-fire low-disturbance sample preparation device includes a base plate 1, and a first side plate 101 and a second side plate 102 fixedly disposed on both sides of the base plate 1. A threaded rod 2 is rotatably connected between the first side plate 101 and the second side plate 102. A slider 202 is threadedly connected to the threaded rod 2, and a bearing plate 203 is fixedly connected to the slider 202. A motor 204 is provided on the bearing plate 203, and a cutting wheel 206 is connected to the output end of the motor 204. A conveying cylinder 4 is fixedly disposed on the outer wall of the first side plate 101. A rack plate 402 is slidably connected inside the conveying cylinder 4. A connecting shaft 403 is provided at one end of the threaded rod 2 outside the first side plate 101. A gear 404 meshing with the rack plate 402 is provided on the connecting shaft 403. A gas collecting assembly for supplying gas to the conveying cylinder 4 is provided on the bearing plate 203. A limiting frame 5 is fixedly connected to the second side plate 102.

[0035] Reference Figure 7 and Figure 8 A connecting rod 507 is fixedly connected to the second side plate 102, a limiting frame 5 is fixedly connected to the connecting rod 507, an installation frame 501 is slidably connected inside the limiting frame 5, and a pressure plate 503 is slidably connected inside the installation frame 501.

[0036] Reference Figure 7 and Figure 8 Elastic elements 502 are provided between the inner walls of both sides of the limiting frame 5 and the mounting frame 501. Multiple long grooves 504 are provided on the limiting frame 5. A locking screw 505 is rotatably connected to the pressure plate 503. The locking screw 505 is threadedly connected to the mounting frame 501. A limiting rod 506 is fixedly connected to the top outer wall of the mounting frame 501. Both the locking screw 505 and the limiting rod 506 are slidably connected in the long grooves 504.

[0037] In this embodiment, when installing the hydrogen storage structure, the hydrogen storage structure to be prepared and cut is first inserted into the mounting frame 501. Then, the locking screw 505 is rotated to connect with the mounting frame 501 by threads, thereby causing the pressure plate 503 to move downwards and press the hydrogen storage structure plate between the pressure plate 503 and the inner wall of the mounting frame 501, thus completing the fixation. During the preparation and cutting process, because the cutting wheel 206 comes into contact with the hydrogen storage structure plate, the mounting frame 501 will slide within the limiting frame 5, which can generate a certain buffer space, thereby avoiding the cutting wheel 206 from contacting the hydrogen storage structure. The rigid cutting mechanism improves cutting stability, and the elastic element 502 further enhances the buffering effect. Only under the pushing force of external force can the mounting frame 501 move slightly. During the movement of the mounting frame 501, the locking screw 505 and the limiting rod 506 slide within the long groove 504. The long groove 504 provides space for their movement, preventing jamming. The limiting rod 506 makes the pressure plate 503 move more stably. A sponge pad or rubber pad can be installed on the bottom outer wall of the pressure plate 503 to improve the protection of the hydrogen storage structure.

[0038] Example 3:

[0039] A method for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure comprises the following steps: Step 1: Install the composite hydrogen storage structure to be prepared after fire thermal exposure into the limiting frame 5 to fix it in place; Step 2: Start the motor 204 installed on the support plate 203, so that it drives the cutting wheel 206 at the output end to start rotating; Step 3: When the motor 204 is working, it will drive the gas collection component to work and continuously deliver gas into the conveying cylinder 4; Step 4: Push the rack plate 402 inside the conveying cylinder 4 to start moving and meshing with the gear 404, which will drive the connecting shaft 403 and the threaded rod 2 to start rotating. Step 5: The threaded rod 2 drives the slider 202 connected to it to move, which in turn drives the bearing plate 203 and the motor 204 to move, controlling the cutting wheel 206 to approach the hydrogen storage structure installed in the limiting frame 5 and continuously complete the cutting effect to achieve the preparation purpose.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for preparing low-disturbance post-fire samples of high-pressure hydrogen storage structures, comprising a base plate (1), characterized in that, Also includes: A first side plate (101) and a second side plate (102) are fixedly installed on both sides of the base plate (1), and a threaded rod (2) is rotatably connected between the first side plate (101) and the second side plate (102). A slider (202) is threadedly connected to a threaded rod (2). A bearing plate (203) is fixedly connected to the slider (202). A motor (204) is provided on the bearing plate (203). A cutting grinding wheel (206) is connected to the output end of the motor (204). The conveying cylinder (4) is fixedly installed on the outer wall of the first side plate (101). A rack plate (402) is slidably connected inside the conveying cylinder (4). A connecting shaft (403) is provided at one end of the threaded rod (2) outside the first side plate (101). A gear (404) meshing with the rack plate (402) is provided on the connecting shaft (403). An air collecting assembly for supplying air to the conveying cylinder (4) is provided on the bearing plate (203). The limiting frame (5) is fixedly connected to the second side plate (102).

2. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 1, characterized in that, The gas collection assembly includes a gas collection cylinder (3) and a push plate (303) slidably connected to the gas collection cylinder (3). A support plate (305) is fixedly connected to the outer wall of the bearing plate (203). The gas collection cylinder (3) is fixedly connected to the top of the bearing plate (203) through the support plate (305). A guide rod (201) is also fixedly connected between the first side plate (101) and the second side plate (102). The slider (202) is slidably connected to the guide rod (201).

3. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 2, characterized in that, A first piston (301) is slidably connected inside the gas collecting cylinder (3). A push rod (302) is fixedly connected to the outer wall of the first piston (301). The push rod (302) passes through the gas collecting cylinder (3) through one end of the first piston (301) and is fixedly connected to the push plate (303). The output end of the motor (204) is connected to an output shaft (205). The cutting wheel (206) is connected to the output shaft (205). A cam (207) corresponding to the push plate (303) is provided on the outer wall of the output shaft (205).

4. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 3, characterized in that, The outer wall of the gas collecting cylinder (3) is also provided with a delivery pipe (306) and an air inlet pipe (307). Both the delivery pipe (306) and the air inlet pipe (307) are provided with one-way valves. The end of the delivery pipe (306) away from the gas collecting cylinder (3) is connected to the delivery cylinder (4). A spring (304) is provided between the first piston (301) and the inner wall of the gas collecting cylinder (3). The spring (304) is sleeved on the outer wall of the push rod (302).

5. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 4, characterized in that, The conveying cylinder (4) is slidably connected to a second piston (401), the rack plate (402) is fixedly connected to the second piston (401), and a pressure relief valve (406) is provided on the outer wall of the conveying cylinder (4).

6. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 5, characterized in that, A hook (407) is fixedly connected to the outer wall of the first side plate (101). A groove (103) is provided on the first side plate (101). The end of the conveying pipe (306) away from the gas collecting cylinder (3) passes through the groove (103) and is hooked on the hook (407).

7. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 5, characterized in that, A support block (405) is fixedly installed on the outer wall of the first side plate (101). The conveying cylinder (4) is connected to the support block (405). After the gas in the gas collecting cylinder (3) enters the conveying cylinder (4) through the conveying pipe (306), it will push the second piston (401) to drive the rack plate (402) to move.

8. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 1, characterized in that, A connecting rod (507) is fixedly connected to the second side plate (102), and the limiting frame (5) is fixedly connected to the connecting rod (507). An installation frame (501) is slidably connected inside the limiting frame (5), and a pressure plate (503) is slidably connected inside the installation frame (501).

9. The apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure according to claim 8, characterized in that, The inner walls on both sides of the limiting frame (5) are provided with elastic elements (502) between the mounting frame (501). The limiting frame (5) is provided with multiple long grooves (504). A locking screw (505) is rotatably connected to the pressure plate (503). The locking screw (505) is threadedly connected to the mounting frame (501). A limiting rod (506) is fixedly connected to the top outer wall of the mounting frame (501). The locking screw (505) and the limiting rod (506) are both slidably connected in the long grooves (504).

10. A method for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure, comprising the apparatus for preparing a low-disturbance post-fire sample of a high-pressure hydrogen storage structure as described in any one of claims 1-9, characterized in that, Follow these steps: Step 1: Install the composite hydrogen storage structure that has been exposed to fire heat into the limiting frame (5) to fix it in place; Step 2: Start the motor (204) set on the support plate (203), so that it drives the cutting wheel (206) at the output end to start rotating; Step 3: When the motor (204) is working, it will drive the gas collection component to work and continuously transport gas into the conveying cylinder (4); Step 4: Push the rack plate (402) inside the conveying cylinder (4) to start moving and meshing with the gear (404), which will drive the connecting shaft (403) and the threaded rod (2) to start rotating; Step 5: The threaded rod (2) drives the slider (202) connected to it to move, which in turn drives the bearing plate (203) and the motor (204) to start moving, controlling the cutting wheel (206) to approach the hydrogen storage structure installed in the limiting frame (5) and continuously complete the cutting effect to achieve the preparation purpose.

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