Device and method for testing water pressure of hydrogen storage cylinder

Abstract

The invention discloses a hydrogen storage cylinder water pressure testing device and method, the device comprises a clamping assembly and a water injection and evacuation assembly, the clamping assembly comprises a clamping mechanism and a swing driving mechanism, and the swing driving mechanism is used for driving the clamping mechanism to swing so as to control the hydrogen storage cylinder clamped on the clamping mechanism to swing up and down; the water injection emptying assembly comprises a testing tool mechanism and a water injection pressurizing mechanism, the testing tool mechanism comprises a tool body, a vacuum pipe and a water injection pipe, the tool body is arranged in the bottle nozzle in a sleeved mode, and the vacuum pipe is provided with a gas inlet end extending into the hydrogen storage bottle and an exhaust end communicated with the outside; the water injection pipe is provided with a water outlet end communicated with the interior of the hydrogen storage cylinder and a water inlet end connected with the water injection pressurization mechanism, and the air inlet end is provided with a floating piece. The liquid level in the hydrogen storage cylinder swings relative to the hydrogen storage cylinder, so that the gas inlet end of the vacuum tube is driven to different areas in the hydrogen storage cylinder, gas is discharged outwards, it is guaranteed that the hydrogen storage cylinder is filled with liquid, formation of a gas cavity is avoided, and the testing accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pressure test, in particular to a hydrogen storage cylinder water pressure test device and method. BACKGROUND

[0002] The composite laminated structure of the existing hydrogen storage cylinder is prone to failure modes such as interface delamination and fiber buckling under high pressure (usually 35-70 MPa) and temperature alternating environment, and its safety is highly dependent on the accuracy of the manufacturing process and the structural integrity. As the core link of the cylinder type test, water pressure burst test is an important means to evaluate the ultimate bearing capacity and failure mode.

[0003] Before the water pressure burst test of the hydrogen storage cylinder is carried out, the liquid needs to be filled to expel the air, so as to ensure the accuracy of the final water pressure burst result. For some irregular shaped and non-vertical hydrogen storage cylinders, the local area of the inner cavity is higher than the horizontal height of the bottle mouth, which causes several air cavities in the bottle during rapid liquid injection, affecting the final test result. SUMMARY The present application aims to provide a hydrogen storage cylinder water pressure test device and method to solve one or more technical problems existing in the prior art, at least to provide a beneficial choice or create conditions.

[0004] The technical solution adopted to solve the above technical problems is: The present application provides a hydrogen storage cylinder water pressure test device suitable for non-vertical hydrogen storage cylinders, wherein the hydrogen storage cylinder is provided with a nozzle, and the hydrogen storage cylinder water pressure test device comprises: A clamping assembly comprising a clamping mechanism for clamping the hydrogen storage cylinder, and a swing driving mechanism in driving connection with the clamping mechanism, the swing driving mechanism being used to drive the clamping mechanism to swing, so as to control the hydrogen storage cylinder clamped on the clamping mechanism to swing up and down; A water injection and emptying assembly comprising a test tool mechanism and a water injection and pressurizing mechanism, the test tool mechanism comprising a tool main body, a vacuum pipe and a water injection pipe, the tool main body being used to detachably sleeve in the nozzle, the vacuum pipe and the water injection pipe being respectively provided in the tool main body, the vacuum pipe being provided with an air inlet end for extending into the hydrogen storage cylinder and an air outlet end for communicating with the outside of the hydrogen storage cylinder, the part of the vacuum pipe extending into the hydrogen storage cylinder being a flexible hose structure, the water injection pipe being provided with a water outlet end for communicating with the inside of the hydrogen storage cylinder and a water inlet end for connecting with the water injection and pressurizing mechanism, the water injection and pressurizing mechanism being used to inject liquid into the hydrogen storage cylinder through the water injection pipe, and the air inlet end being provided with a floating element having a density smaller than that of the liquid.

[0005] The hydrogen storage cylinder water pressure test device of the present application has the following beneficial effects: In use, the liquid is injected into the hydrogen storage cylinder through the liquid injection and pressurization mechanism, and the clamping mechanism is swung by the swing driving mechanism to control the up-down swinging of the hydrogen storage cylinder clamped on the clamping mechanism, so that the liquid level in the hydrogen storage cylinder swings relative to the hydrogen storage cylinder, and the floating member floating on the liquid level also moves with the liquid level to drive the gas inlet end of the vacuum tube to different areas inside the hydrogen storage cylinder and discharge the gas outside, so that the hydrogen storage cylinder is filled with liquid to avoid the formation of gas cavity and improve the accuracy of the test.

[0006] As a further improvement of the above technical solution, the tool body comprises a sleeve body segment and an abutting body segment connected in sequence, the outer diameter of the abutting body segment is larger than that of the sleeve body segment, the sleeve body segment is sealingly sleeved in the nozzle, and the end of the abutting body segment close to the sleeve body segment is used for sealing abutting with the end of the nozzle away from the inside of the hydrogen storage cylinder.

[0007] As a further improvement of the above technical solution, the outer peripheral wall of the sleeve body segment is provided with external threads for threaded connection with the nozzle.

[0008] As a further improvement of the above technical solution, at least one first sealing ring is arranged between the abutting body segment and the nozzle. At least one second sealing ring is arranged between the outer peripheral wall of the sleeve body segment and the inner peripheral wall of the nozzle.

[0009] As a further improvement of the above technical solution, the outer peripheral wall of the sleeve body segment is provided with a first annular groove for mounting the first sealing ring and a second annular groove for mounting the second sealing ring, and the outer diameter of the first sealing ring is larger than that of the second sealing ring.

[0010] As a further improvement of the above technical solution, the gas inlet end is provided with a miniature camera.

[0011] As a further improvement of the above technical solution, the clamping mechanism comprises a bottom plate and a load-bearing plate located above the bottom plate, one end of the load-bearing plate is hinged to the bottom plate, and the load-bearing plate is provided with a fixing structure for fixing the hydrogen storage cylinder.

[0012] As a further improvement of the above technical solution, the end of the load-bearing plate hinged to the bottom plate is provided with a baffle, and the baffle is used for abutting with the end of the hydrogen storage cylinder away from the nozzle.

[0013] As a further improvement of the above technical solution, the swing driving mechanism comprises a lifting jack mounted on the bottom plate, and the driving and telescopic end of the lifting jack is movably connected to the end of the load-bearing plate away from the baffle.

[0014] The application further provides a hydrogen storage cylinder water pressure testing method suitable for the hydrogen storage cylinder water pressure testing device. controlling the clamping mechanism to clamp the hydrogen storage cylinder to be tested; controlling the tool body to be sleeved on the cylinder nozzle of the hydrogen storage cylinder, and the inside of the hydrogen storage cylinder to be communicated with the outside through the vacuum pipe; controlling the water injection and pressurization mechanism to inject liquid into the inside of the hydrogen storage cylinder; controlling the hydrogen storage cylinder to swing up and down, so that the floating member drives the air inlet end to float to different areas inside the hydrogen storage cylinder, and the inside of the hydrogen storage cylinder is filled with liquid; controlling the vacuum pipe and the water injection pipe to be closed, and after being static for a preset time, leak detection is performed; when there is no liquid leakage, controlling the water injection and pressurization mechanism to pressurize the inside of the hydrogen storage cylinder until the hydrogen storage cylinder bursts, and recording real-time test data.

[0015] Other features and advantages of the application will be described in the following description, and some will become apparent from the description, or will be understood by those skilled in the art through implementation of the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The application will be further described below in combination with the drawings and examples; Figure 1 is a structural schematic view of an embodiment of the hydrogen storage cylinder water pressure testing device provided by the application; Figure 2 is a structural schematic view of an embodiment of the testing tool mechanism provided by the application; Figure 3 is a flowchart of an embodiment of the hydrogen storage cylinder water pressure testing method provided by the application; REFERENCE NUMERALS clamping assembly 100, clamping mechanism 110, bottom plate 111, bearing plate 112, fixed connecting rod 113, baffle plate 114, swing driving mechanism 120, lifting jack 121; water injection and emptying assembly 200, testing tool mechanism 210, tool body 211, sleeve body section 2111, abutting body section 2112, external thread 2113, vacuum pipe 212, air inlet end 2121, air outlet end 2122, water injection pipe 213, water outlet end 2131, water inlet end 2132, floating member 214, first sealing ring 215, second sealing ring 216; hydrogen storage cylinder 300, cylinder nozzle 310. DETAILED DESCRIPTION

[0017] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0018] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, only for the purpose of facilitating the description of the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0019] In the description of the present application, the plural refers to two or more. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence relationship of the technical features indicated.

[0020] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0021] The technical solutions of the present application will be described below in conjunction with the drawings. Obviously, the following described embodiments are part of the embodiments of the present application, not all embodiments.

[0022] With the rapid development of hydrogen energy industry, the safety and reliability of high-pressure hydrogen storage technology, as the core link of hydrogen fuel cell vehicles, have attracted much attention. Among them, type IV hydrogen storage cylinders have become the first choice for vehicle-mounted hydrogen storage systems due to their lightweight, corrosion resistance and high hydrogen storage density. Unlike traditional metal cylinders (type I, type II) and fiber-wound metal liner cylinders (type III), type IV cylinders use high molecular polymers (such as high-density polyethylene or polyamide) as the inner liner, and the outer layer is formed by winding carbon fiber reinforced resin composite materials. This structure not only significantly reduces the self-weight of the cylinder (about 20%-30% lighter than type III cylinder), but also has excellent fatigue resistance and chemical stability, which can meet the needs of frequent charging and discharging cycles and complex working conditions of vehicle-mounted hydrogen storage systems.

[0023] The composite laminated structure of the type IV hydrogen storage cylinder is prone to interfacial delamination, fiber buckling and other failure modes under high pressure (usually 35-70 MPa) and temperature alternating environment, and its safety is highly dependent on the accuracy of the manufacturing process and the structural integrity. As the core link of the cylinder type test, the water pressure burst test is an important means to evaluate the ultimate bearing capacity and failure mode. In order to ensure its service safety, the water pressure burst test is listed as a mandatory verification method in ISO 11119-3, GB / T 35544 and GB-T42612 standards, and the minimum burst pressure and failure mode need to be accurately measured by overpressure test (≥2.25 times working pressure). This test not only verifies the rationality of the cylinder structure design, but also is the core criterion for evaluating the consistency of the production process (such as fiber layer angle and curing degree).

[0024] Before the water pressure burst test of the type IV hydrogen storage cylinder, the liquid needs to be filled and the air needs to be discharged as much as possible to ensure the accuracy of the final water pressure burst result. However, the vertical filling method is currently widely used in the industry, that is, the type IV hydrogen storage cylinder is first placed vertically for water filling, and after the water filling is completed, the filled type IV hydrogen storage cylinder is turned over and placed horizontally, and then the water pressure burst test is carried out after connecting the corresponding pressure device. This method results in a huge operation space required for the overall water pressure burst device, and the overall test efficiency is low. Moreover, for some irregular shaped and non-vertical hydrogen storage cylinders 300, there are several local areas in the inner cavity that are higher than the horizontal height of the cylinder mouth, which causes several air cavities in the cylinder during rapid liquid filling, affecting the final test result.

[0025] Therefore, it is urgent to develop a hydrogen storage cylinder water pressure test device and method to improve the test efficiency of water pressure burst, avoid the formation of air cavities, and improve the accuracy of the test.

[0026] As shown in Figure 1 The hydrogen storage cylinder water pressure test device of the present application is suitable for non-vertical hydrogen storage cylinders 300, specifically, the hydrogen storage cylinder 300 is a type IV hydrogen storage cylinder, and the hydrogen storage cylinder 300 is provided with a cylinder mouth 310, which is horizontally placed in the normal state, and the cylinder mouth 310 faces the horizontal direction.

[0027] As shown in Figure 1 The hydrogen storage cylinder water pressure test device of the present application comprises a clamping assembly 100 and a water filling and emptying assembly 200.

[0028] As shown in Figure 1As shown, the clamping assembly 100 comprises a clamping mechanism 110 and a swing driving mechanism 120, wherein the clamping mechanism 110 is used for clamping the hydrogen storage cylinder 300, the swing driving mechanism 120 is in driving connection with the clamping mechanism 110, and the swing driving mechanism 120 is used for driving the clamping mechanism 110 to swing, so as to control the hydrogen storage cylinder 300 clamped on the clamping mechanism 110 to swing up and down, and drive the nozzle 310 to swing up and down.

[0029] As shown, Figure 1 and Figure 2 As shown, the water injection and emptying assembly 200 comprises a test tool mechanism 210 and a water injection and pressurizing mechanism, the test tool mechanism 210 comprises a tool main body 211, a vacuum pipe 212 and a water injection pipe 213, the tool main body 211 is used for being detachably sleeved in the nozzle 310, the vacuum pipe 212 and the water injection pipe 213 are respectively arranged in the tool main body 211, the vacuum pipe 212 is provided with an air inlet end 2121 and an air outlet end 2122, when the tool main body 211 is sleeved in the nozzle 310, the air inlet end 2121 extends into the hydrogen storage cylinder 300, and the air outlet end 2122 is in communication with the outside of the hydrogen storage cylinder 300, so as to realize the discharge of the gas in the hydrogen storage cylinder 300.

[0030] In the embodiment, the part of the vacuum pipe 212 extending into the hydrogen storage cylinder 300 is a flexible pipe structure, and it can be understood that the vacuum pipe 212 can be automatically bent and deformed in the hydrogen storage cylinder 300.

[0031] The water injection pipe 213 of the present application is provided with a water outlet end 2131 and a water inlet end 2132, when the tool main body 211 is sleeved in the nozzle 310, the water outlet end 2131 is in communication with the inside of the hydrogen storage cylinder 300, and the water inlet end 2132 is in communication with the outside of the hydrogen storage cylinder 300, in use, the water inlet end 2132 is connected with the water injection and pressurizing mechanism, the water injection and pressurizing mechanism of the present embodiment is used for injecting liquid into the hydrogen storage cylinder 300 through the water injection pipe 213, and the present embodiment injects water into the hydrogen storage cylinder 300.

[0032] The air inlet end 2121 of the present application is provided with a floating piece 214 with a density smaller than that of the liquid, the floating piece 214 is kept floating above the liquid surface, so that the gas in the hydrogen storage cylinder 300 can enter the vacuum pipe 212 from the air inlet end 2121 and be discharged outward.

[0033] In use, the liquid is injected into the hydrogen storage cylinder 300 through the liquid injection and pressure increasing mechanism, and the clamping mechanism 110 is swung by the swing driving mechanism 120 to swing the hydrogen storage cylinder 300 clamped on the clamping mechanism 110 up and down, so that the liquid level in the hydrogen storage cylinder 300 swings relative to the hydrogen storage cylinder 300. The floating member 214 floating on the liquid level will also move with the liquid level to drive the gas inlet end 2121 of the vacuum tube 212 to different areas inside the hydrogen storage cylinder 300 and discharge gas outward, so as to ensure that the hydrogen storage cylinder 300 is filled with liquid and avoid the formation of gas cavity, thereby improving the accuracy of the test.

[0034] As shown in Figure 2 The tool body 211 of the embodiment has a stepped shaft structure, and includes a sleeving body segment 2111 and an abutting body segment 2112 connected in sequence. The outer diameter of the abutting body segment 2112 is greater than that of the sleeving body segment 2111. The sleeving body segment 2111 is sealingly sleeved in the nozzle 310, and the end of the abutting body segment 2112 close to the sleeving body segment 2111 is used to sealingly abut the end of the nozzle 310 away from the inside of the hydrogen storage cylinder 300, so as to form a multi-stage sealing effect.

[0035] The tool body 211 of the embodiment is provided with a passage through which the vacuum tube 212 and the liquid injection tube 213 pass.

[0036] Further, the outer peripheral wall of the sleeving body segment 2111 is provided with external threads 2113, and the inner peripheral wall of the nozzle 310 is provided with internal threads. The sleeving body segment 2111 is fixed in the nozzle 310 by thread connection, so as to facilitate disassembly and reassembly and have good sealing effect.

[0037] In other embodiments, the sleeving body segment 2111 can be fixedly installed in the nozzle 310 by interference fit.

[0038] In order to further improve the sealing performance, at least one first sealing ring 215 is arranged between the abutting body segment 2112 and the nozzle 310, and at least one second sealing ring 216 is arranged between the outer peripheral wall of the sleeving body segment 2111 and the inner peripheral wall of the nozzle 310, so as to realize gradient sealing effect without interfering with the connection between the tool body 211 and the nozzle 310.

[0039] Further, the outer peripheral wall of the sleeving body segment 2111 is provided with a first annular groove for mounting the first sealing ring 215 and a second annular groove for mounting the second sealing ring 216. The outer diameter of the first sealing ring 215 is greater than that of the second sealing ring 216, so as to ensure that the first sealing ring 215 can be clamped between the end surface of the abutting body segment 2112 and the nozzle 310.

[0040] In some other embodiments, the gas inlet end 2121 is provided with a micro camera to facilitate observation of the specific position of the gas inlet end 2121 inside the hydrogen storage cylinder 300 and auxiliary observation of water injection in the cylinder, wherein the micro camera is an explosion-proof camera.

[0041] As shown in Figure 1 The clamping mechanism 110 of the present embodiment includes a base plate 111 and a load bearing plate 112 above the base plate 111, one end of the load bearing plate 112 is hinged to the base plate 111, and the load bearing plate 112 is provided with a fixing structure for fixing the hydrogen storage cylinder 300, and the swing driving mechanism 120 is in transmission connection with the load bearing plate 112, and the hydrogen storage cylinder 300 is swung by driving the load bearing plate 112 to swing.

[0042] Specifically, the base plate 111 of the present embodiment is connected with a fixed connecting rod 113, and the upper end of the fixed connecting rod 113 is connected with the load bearing plate 112 through a fixed hinge.

[0043] The hydrogen storage cylinder 300 of the present embodiment is horizontally placed on the load bearing plate 112, and the nozzle 310 is away from the side of the load bearing plate 112 and the base plate 111 hinged to each other, and when the load bearing plate 112 swings around the base plate 111, the nozzle 310 is swung up and down.

[0044] The fixing structure can adopt a bandage, which fixes the position of the hydrogen storage cylinder 300 to prevent damage to other equipment and instruments caused by the hydrogen storage cylinder 300 during the explosion process.

[0045] Further, one end of the load bearing plate 112 hinged to the base plate 111 is provided with a baffle 114, and the baffle 114 is used to abut against the end of the hydrogen storage cylinder 300 away from the nozzle 310, and the baffle 114 is a secondary load bearing structure, mainly providing support when the hydrogen storage cylinder 300 is inclined, and the load bearing plate 112 is a primary load bearing structure, supporting the hydrogen storage cylinder 300 during the entire test process.

[0046] In some other embodiments, a sliding groove is provided on the load bearing plate 112 for movement of the baffle 114, and the baffle 114 can move on the load bearing plate 112 to assist in taking out the hydrogen storage cylinder 300 after the explosion is completed.

[0047] The swing driving mechanism 120 of the present embodiment includes a lifting jack 121 mounted on the base plate 111, and the driving telescopic end of the lifting jack 121 is movably connected with the end of the load bearing plate 112 away from the baffle 114, and the jack realizes the inclination of the hydrogen storage cylinder 300 by rising.

[0048] During water injection, the inclination of the hydrogen storage cylinder 300 can also be controlled, and in order to ensure efficiency, the lifting jack 121 needs to be lowered during the actual water pressure test to ensure the level of the hydrogen storage cylinder 300.

[0049] AsFigure 3 The application further provides a hydrogen storage cylinder water pressure testing method, which is suitable for the hydrogen storage cylinder water pressure testing device. Step S100: control the clamping of the hydrogen storage cylinder 300 to be tested on the clamping mechanism 110; Step S200: control the fitting of the tool main body 211 on the cylinder nozzle 310 of the hydrogen storage cylinder 300, and the communication between the inside of the hydrogen storage cylinder 300 and the outside through the vacuum pipe 212; Step S300: control the injection of the liquid into the inside of the hydrogen storage cylinder 300 by the water injection and pressurization mechanism; Step S400: control the up-and-down swinging of the hydrogen storage cylinder 300, so that the floating member 214 drives the air inlet end 2121 to float to different regions in the inside of the hydrogen storage cylinder 300, and the inside of the hydrogen storage cylinder 300 is filled with the liquid; Step S500: control the closing of the vacuum pipe 212 and the water injection pipe 213, and after the static state for a preset time, carry out the leakage detection; Step S600: when there is no liquid leakage, control the pressurization of the inside of the hydrogen storage cylinder 300 by the water injection and pressurization mechanism, until the hydrogen storage cylinder 300 is blown up, and the real-time testing data is recorded.

[0050] In step S100, the baffle 114 is moved to the bottom end of the bearing plate 112, the hydrogen storage cylinder 300 to be tested is moved onto the bearing plate 112, the bottom end of the hydrogen storage cylinder 300 is completely contacted with the baffle 114, and the hydrogen storage cylinder 300 is fixed through the fixing structure on the bearing plate 112; In step S200, the water injection pipe 213 and the vacuum pipe 212 are inserted into the hydrogen storage cylinder 300 by clamping the tool main body 211, and the tool main body 211 is screwed, so that the sleeve body section 2111 is threadedly connected in the cylinder nozzle 310.

[0051] In step S400, the top rod is started, the driving telescopic end of the top rod reciprocates, one end of the bearing plate 112 reciprocates, the hydrogen storage cylinder 300 clamped on the bearing plate 112 swings up and down, the liquid level in the inside of the hydrogen storage cylinder 300 swings relative to the hydrogen storage cylinder 300, the floating member 214 floating on the liquid level also moves with the liquid level, the air inlet end 2121 of the vacuum pipe 212 is driven to different regions in the inside of the hydrogen storage cylinder 300, and the gas is discharged outward.

[0052] In step S500, the lifting top rod 121 is started, the bearing plate 112 drives the hydrogen storage cylinder 300 to return to the horizontal position, the vacuum pipe 212 and the water injection pipe 213 are closed through the control valve, the vacuum pipe 212 and the water injection pipe 213 of the embodiment are respectively connected with the control valve, and whether there is liquid leakage at the cylinder nozzle 3100 and the tool main body 211 is observed after the static state for 5 minutes.

[0053] In step S600, after the leak detection is completed, the water injection pipe 213 is opened, the water pressure burst test procedure is started, water is continuously injected through the water injection pipe 213 until the hydrogen storage cylinder 300 bursts, and finally the data is recorded in real time. After the burst test is completed, the cleaning is performed.

[0054] The water injection and pressure increasing mechanism comprises a pressure increasing pump and a water accumulator, and the inlet and outlet of the pressure increasing pump are connected with the water accumulator and the water injection pipe 213 respectively.

[0055] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A hydrogen storage cylinder water pressure testing device, characterized in that: Applicable to non-vertical hydrogen storage cylinders, the hydrogen storage cylinders are provided with a bottle mouth, and the hydrogen storage cylinder water pressure testing device includes: The clamping assembly includes a clamping mechanism for clamping the hydrogen storage cylinder and a swing drive mechanism connected to the clamping mechanism, wherein the swing drive mechanism is used to drive the clamping mechanism to swing so as to control the hydrogen storage cylinder clamped in the clamping mechanism to swing up and down; The water injection and emptying assembly includes a test tooling mechanism and a water injection pressurizing mechanism. The test tooling mechanism includes a tooling body, a vacuum tube and a water injection pipe. The tooling body is used to be detachably mounted in the bottle mouth. The vacuum tube and the water injection pipe are respectively passed through the tooling body. The vacuum tube is provided with an air inlet end for extending into the hydrogen storage cylinder and an exhaust end for communicating with the outside of the hydrogen storage cylinder. The part of the vacuum tube extending into the interior of the hydrogen storage cylinder is a flexible hose structure. The water injection pipe is provided with a water outlet end for communicating with the interior of the hydrogen storage cylinder and a water inlet end for connecting to the water injection pressurizing mechanism. The water injection pressurizing mechanism is used to inject liquid into the interior of the hydrogen storage cylinder through the water injection pipe. The air inlet end is provided with a floating part with a density less than that of the liquid.

2. The hydrogen storage cylinder water pressure testing device according to claim 1, characterized in that: The tooling body includes a sleeve body section and an abutment body section connected in sequence, the outer diameter of the abutment body section is larger than the outer diameter of the sleeve body section, the sleeve body section sealing sleeve is arranged in the bottle mouth, and the end of the abutment body section close to the sleeve body section is used to seal and abut with the end of the bottle mouth away from the interior of the hydrogen storage cylinder.

3. The hydrogen storage cylinder water pressure testing device according to claim 2, characterized in that: The outer peripheral wall of the sleeve body section is provided with an external thread for threaded connection with the bottle mouth.

4. The hydrogen storage cylinder water pressure testing device according to claim 2, characterized in that: At least one first sealing ring is provided between the abutting body section and the bottle mouth; At least one second sealing ring is provided between the outer peripheral wall of the sleeve body section and the inner peripheral wall of the bottle mouth.

5. The hydrogen storage cylinder water pressure testing device according to claim 4, characterized in that: The outer peripheral wall of the sleeve body section is provided with a first annular groove for installing the first sealing ring and a second annular groove for installing the second sealing ring. The outer diameter of the first sealing ring is greater than the outer diameter of the second sealing ring.

6. The hydrogen storage cylinder water pressure testing device according to claim 1, characterized in that: The air inlet end is provided with a micro camera.

7. The hydrogen storage cylinder water pressure testing device according to claim 1, characterized in that: The clamping mechanism includes a base plate and a load-bearing plate located above the base plate. One end of the load-bearing plate is hinged to the base plate, and the load-bearing plate is provided with a fixing structure for fixing the hydrogen storage cylinder.

8. The hydrogen storage cylinder water pressure testing device according to claim 7, characterized in that: A baffle is provided at one end of the load-bearing plate hinged to the bottom plate, and the baffle is used to abut against the end of the hydrogen storage cylinder away from the bottle mouth.

9. The hydrogen storage cylinder water pressure testing device according to claim 8, characterized in that: The swing driving mechanism includes a lifting push rod installed on the bottom plate, and a driving telescopic end of the lifting push rod is movably connected to an end of the bearing plate away from the baffle.

10. A method for testing the water pressure of a hydrogen storage cylinder, characterized in that: Applicable to the hydrogen storage cylinder water pressure testing device according to any one of claims 1 to 9, the hydrogen storage cylinder water pressure testing method comprising: Controlling the clamping of the hydrogen storage cylinder to be tested on the clamping mechanism; Controlling the tool body to be sleeved into the mouth of the hydrogen storage cylinder, and connecting the interior of the hydrogen storage cylinder with the outside through the vacuum tube; Controlling the water injection and pressurizing mechanism to inject liquid into the interior of the hydrogen storage cylinder to empty it; Controlling the hydrogen storage cylinder to swing up and down so that the floating member drives the air inlet end to float to different areas inside the hydrogen storage cylinder, so as to fill the interior of the hydrogen storage cylinder with liquid; Controlling to close the vacuum tube and the water injection tube, and performing leak detection after they are stationary for a preset time; When there is no leakage, the water injection and pressurizing mechanism is controlled to pressurize the interior of the hydrogen storage cylinder until the hydrogen storage cylinder explodes, and real-time test data is recorded.

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