Hydrogen exchange heavy truck

Abstract

The invention provides a hydrogen exchange heavy truck, belongs to the technical field of hydrogen exchange heavy trucks, and solves the problem of potential safety hazards caused by frequent insertion of hydrogen joints in the prior art. The vehicle comprises a vehicle body, a frame is detachably connected to the vehicle body, at least one hydrogen cylinder is installed on the frame, a conical plug pipe communicated with the hydrogen cylinder is arranged at the bottom of the frame, a socket pipe used for containing the conical plug pipe is arranged on the vehicle body, and valve element assemblies used for being opened through pressing are arranged in the conical plug pipe and the socket pipe. The elastic force of the valve element assembly located in the socket pipe is larger than that of the valve element assembly located in the conical plug pipe, at least two sets of air outlet holes located above the valve element assembly are annularly formed in the inner wall of the socket pipe, the two sets of air outlet holes are communicated with nitrogen pipes respectively, electromagnetic valves are arranged on the nitrogen pipes, and a sealing ring is arranged between the two sets of air outlet holes. And two groups of air outlet holes are arranged to purge oxygen in the socket tube, so that the safety in the plugging process is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen-exchange heavy-duty trucks, and in particular to a hydrogen-exchange heavy-duty truck. Background Art

[0002] As an important type of new energy heavy-duty truck, hydrogen heavy-duty truck has the advantages of zero emission and long driving range, and has broad application prospects in the fields of long-distance logistics and heavy-duty transportation. The working principle of hydrogen-swap heavy-duty truck is similar to the battery swap mode of electric vehicles. When the hydrogen-powered heavy-duty truck needs to be replenished with energy, the driver only needs to remove the exhausted hydrogen storage device and replace it with a hydrogen storage device filled with hydrogen to complete the energy replenishment process. This process usually only takes a few minutes, which greatly shortens the hydrogen refueling time, and when the hydrogen storage device needs maintenance, it does not affect the continued use of the hydrogen-swap heavy-duty truck, which undoubtedly improves the operational efficiency of the vehicle.

[0003] In order to quickly replace hydrogen cylinders and related frames, existing hydrogen-changing heavy trucks use an up-and-down plug-in connection method. Due to factors such as static electricity, frictional heat and even sparks during the plug-in process, there are safety hazards when plugging in hydrogen connectors in an aerobic environment. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a hydrogen-exchange heavy truck, which is provided with two sets of air outlet holes to purge the oxygen in the socket tube, thereby increasing the safety during the plugging process.

[0005] The technical solution adopted by the present invention is as follows: A hydrogen-exchange heavy truck comprises a vehicle body, a frame is detachably connected to the vehicle body, at least one hydrogen cylinder is mounted on the frame, a conical plug tube connected to the hydrogen cylinder is arranged at the bottom of the frame, a socket tube for matching the conical plug tube is arranged on the vehicle body, valve core assemblies for being pressed to open are elastically arranged in the conical plug tube and the socket tube, and the elastic force of the valve core assembly in the socket tube is greater than the elastic force of the valve core assembly in the conical plug tube, at least two groups of air outlet holes are annularly arranged on the inner wall of the socket tube and are located above the valve core assembly, the two groups of air outlet holes are respectively connected to nitrogen pipes, an electromagnetic valve is arranged on the nitrogen pipe, and a sealing ring is arranged between the two groups of air outlet holes.

[0006] Preferably, the inner wall of the socket tube is provided with a first position sensor and a second position sensor in sequence from top to bottom, the second position sensor is located between the two groups of air outlets, the upper group of air outlets is arranged between the first position sensor and the second position sensor, and the first position sensor and the second position sensor are connected to the solenoid valve through a controller.

[0007] Preferably, the valve core assembly includes a guide frame fixedly arranged on the inner wall of the pipeline, a guide rod vertically and movably penetrates the guide frame, a sealing plug for sealing the pipeline is fixedly connected to the guide rod, and a return spring is sleeved on the guide rod and abuts against the sealing plug and the guide frame.

[0008] Preferably, an electric plug and a first annular insulating member sleeved on the outside of the electric plug are provided at the bottom of the frame, the electric plug does not protrude from the first annular insulating member, an electric socket is provided on the vehicle body, a second annular insulating member sleeved on the outside of the electric socket protrudes from the electric socket, an annular groove for vertical movement of the second annular insulating member is provided on the vehicle body, and a spring abutting against the second annular insulating member is provided in the annular groove.

[0009] Preferably, a groove is formed at the bottom of the frame, and the first annular insulating member and the tapered plug tube are arranged in the groove and do not protrude from the groove.

[0010] Preferably, the outer wall of the socket tube is provided with an annular air hood connected with the nitrogen pipe, and the annular air hood is provided on the air outlet.

[0011] Preferably, a one-way valve is provided in each of the air outlet holes below the sealing ring.

[0012] Preferably, at least two fixing rods located on both sides of the frame are fixedly provided on the vehicle body, and limit insertion holes are transversely provided on the fixing rods, and a locking device cooperating with the limit insertion holes is fixedly provided on the outer side of the frame.

[0013] Preferably, the locking device includes a mounting block, a positioning socket for accommodating a fixing rod is provided at the bottom of the mounting block, a working chamber connected to the positioning socket is provided in the mounting block, a driving plate is hinged in the working chamber and extends into the positioning socket, a slot is transversely provided in the mounting block and passes through the positioning socket, an insertion rod is movably provided in the slot, a tension spring is sleeved on the insertion rod, one end of the tension spring is fixedly connected to the outer wall of the mounting block, the other end of the tension spring is fixedly connected to the tail end of the insertion rod, a slot is provided on the upper surface of the insertion rod, a limit stop rod is vertically movably provided in the working chamber, the limit stop rod movably extends into the slot and cooperates with the slot, a lifting mechanism is provided in the working chamber and cooperates with the driving plate to drive the limit stop rod to move upward, the lifting mechanism drives the limit stop rod to move upward and automatically releases the limit stop rod after the limit stop rod is disengaged from the slot.

[0014] Preferably, the lifting mechanism includes a rotating shaft rotatably connected to the driving plate, two oppositely arranged hooks are hinged in the rotating shaft, a driving block is provided at the top of the working chamber, a V-shaped groove is provided at the bottom of the driving block, a hook groove cooperating with the hook is provided on the limit stop rod, a guide slope is provided at the upper end of the limit stop rod, and an inclined surface cooperating with the guide slope is provided at the bottom of the hook.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: Two sets of air outlets are provided to purge oxygen and dust in the socket tube, so that the docking is carried out in an oxygen-free and clean environment, thereby increasing the safety during the plugging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the main structure provided by an embodiment of the present invention; Figure 2 for Figure 1 The enlarged structural diagram at A in the middle; Figure 3 A schematic diagram of an open state of a tapered plug tube provided by an embodiment of the present invention; Figure 4 A schematic diagram of the socket tube in the open state provided by an embodiment of the present invention; Figure 5 for Figure 1 The enlarged structural diagram at B in the middle; Figure 6 A schematic diagram of the structure of a locking device provided in an embodiment of the present invention; Figure 7 A schematic diagram of the three-dimensional structure of a lifting mechanism provided in an embodiment of the present invention; Figure 8 A schematic diagram of the use status of the locking device provided in an embodiment of the present invention.

[0018] Figure numerals: 1-body; 2-frame; 3-hydrogen cylinder; 4-locking device; 401-mounting block; 402-positioning socket; 403-driving plate; 404-drawing hook; 405-driving block; 406-rotating shaft; 407-working chamber; 408-limiting lever; 409-insertion rod; 410-tension spring; 411-card slot; 412-slot; 413-V-shaped groove; 414-hook groove; 5-fixing rod; 415-inclined surface; 416-guide inclined surface; 501-limiting socket; 6-nitrogen cylinder ;7-solenoid valve;8-nitrogen pipe;9-groove;10-conical plug tube;11-valve core assembly;111-guide frame;112-guide rod;113-reset spring;114-sealing plug;12-first position sensor;13-annular air cover;14-second position sensor;15-check valve;16-sealing ring;17-air outlet;18-socket tube;19-electric plug;20-first annular insulating member;21-second annular insulating member;22-annular groove;23-spring;24-electric socket. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Combine the following Figure 1-Figure 8 The present invention is described in detail.

[0023] Example:

[0024] A hydrogen-changing heavy truck, such as Figure 1 and 2 As shown, it includes a vehicle body 1, a frame 2 is detachably connected to the vehicle body 1, at least one hydrogen cylinder 3 is installed on the frame 2, a conical plug tube 10 connected to the hydrogen cylinder 3 is arranged at the bottom of the frame 2, a socket tube 18 for matching the conical plug tube 10 is arranged on the vehicle body 1, a valve core assembly 11 for pressing to open is elastically arranged in both the conical plug tube 10 and the socket tube 18, and the elastic force of the valve core assembly 11 in the socket tube 18 is greater than the elastic force of the valve core assembly 11 in the conical plug tube 10, at least two groups of air outlet holes 17 located above the valve core assembly 11 are annularly arranged on the inner wall of the socket tube 18, and the two groups of air outlet holes 17 are respectively connected to the nitrogen pipe 8, and the solenoid valve 7 is arranged on the nitrogen pipe 8, and a sealing ring 16 is arranged between the two groups of air outlet holes 17. In a preferred embodiment, there are multiple hydrogen cylinders 3, and the multiple hydrogen cylinders 3 are connected through pipelines and finally connected to the conical plug tube 10, and the connection method is not repeated here.

[0025] A nitrogen bottle 6 is provided on the vehicle body 1, and the nitrogen bottle 6 is connected to the nitrogen pipe 8. A lifting lug is provided on the frame 2 for convenient lifting. During the lifting and hydrogen replacement process, the conical plug tube 10 is inserted into the socket tube 18. During the plugging process, the two sets of air outlets 17 first simultaneously purge nitrogen into the socket tube 18 to ensure that there is only nitrogen in the plugging space to prevent the hydrogen from being ignited, and at the same time, the dust on the inner wall of the socket tube 18 can be blown out. When the conical plug tube 10 passes through the upper air outlet 17, the lower air outlet 17 closes the nitrogen pipe 8 through the solenoid valve 7 to stop purging. At the same time, the valve core assembly 11 in the socket tube 18 pushes open the valve core assembly 11 in the conical plug tube 10, and the hydrogen in the hydrogen bottle 3 is discharged from the conical plug tube 10. At this time, the sealing ring 16 has not yet fitted with the outer wall of the conical plug tube 10.

[0026] like Figure 3 As shown, hydrogen purges the nitrogen in the socket tube 18 to prevent the mixing of nitrogen and affect the purity of the hydrogen. The purged hydrogen is discharged from the gap between the sealing ring 16 and the conical plug tube 10 and mixed with the nitrogen discharged from the upper gas outlet 17 to prevent the hydrogen from mixing with oxygen. Figure 4 As shown, after the valve core assembly 11 in the tapered plug tube 10 is pushed open for a certain distance, the valve core assembly 11 in the socket tube 18 is pushed open, thereby realizing the connection between the tapered plug tube 10 and the socket tube 18. At this time, the sealing ring 16 fits with the outer wall of the tapered plug tube 10 to prevent external gas from entering the hydrogen channel. The upper air outlet 17 closes the nitrogen pipe 8 through the solenoid valve 7 to stop purging, thereby completing the plug-in operation of the hydrogen pipeline.

[0027] The inner wall of the socket tube 18 is provided with a first position sensor 12 and a second position sensor 14 in sequence from top to bottom. The second position sensor 14 is located between the two groups of air outlets 17. The group of air outlets 17 located above is provided between the first position sensor 12 and the second position sensor 14. The first position sensor 12 and the second position sensor 14 are connected to the solenoid valve 7 through a controller (the controller is a prior art). The first position sensor 12 and the second position sensor 14 are used to monitor whether the tapered plug tube 10 reaches the specified position; when the first position sensor 12 detects the tapered plug tube 10, the solenoid valve 7 is controlled to open through the controller, and the two groups of air outlets 17 are purged with nitrogen at the same time. When the second position sensor 14 detects the tapered plug tube 10, the solenoid valve 7 of the lower nitrogen pipe 8 is closed; a timer can also be set in the controller (this setting method is a prior art) to control the solenoid valve 7 connected to the upper nitrogen pipe 8 to close at a fixed time.

[0028] The valve core assembly 11 includes a guide frame 111 fixedly arranged on the inner wall of the pipeline, a guide rod 112 vertically and movably penetrates the guide frame 111, a sealing plug 114 for blocking the pipeline is fixedly connected to the guide rod 112, and a return spring 113 is sleeved on the guide rod 112 to abut against the sealing plug 114 and the guide frame 111. The sealing plug 114 can be axially displaced by cooperating with the guide frame 111 through the guide rod 112; the return spring 113 keeps the sealing plug 114 in contact with the pipe mouth to seal and prevent air leakage; the guide frame 111 can allow gas to flow. The elastic force of the valve core assembly 11 in the socket tube 18 is greater than the elastic force of the valve core assembly 11 in the tapered plug tube 10, that is, the elastic force of the lower return spring 113 is greater than the elastic force of the upper return spring 113, so during the insertion of the tapered plug tube 10, the upper valve core assembly 11 is opened first, and then the lower valve core assembly 11 is pushed open.

[0029] The bottom of the frame 2 is provided with an electric plug 19 and a first annular insulating member 20 sleeved on the outside of the electric plug 19, and the electric plug 19 does not protrude from the first annular insulating member 20. The vehicle body 1 is provided with an electric socket 24, and the outside of the electric socket 24 is sleeved with a second annular insulating member 21 protruding from the electric socket 24. The vehicle body 1 is provided with an annular groove 22 for the second annular insulating member 21 to move vertically, and a spring 23 is provided in the annular groove 22 to abut against the second annular insulating member 21. After the electric socket 24 is connected to the electric plug 19, the battery on the vehicle supplies power to the related electrical appliances (such as various sensors, solenoid valves, and electronic instruments) on the frame 2. Electric sparks will be generated during the connection between the electric socket 24 and the electric plug 19, so the first annular insulating member 20 and the second annular insulating member 21 are provided to fit and shield the electric sparks before the electric socket 24 contacts the electric plug 19, so as to prevent the electric sparks from igniting hydrogen or other combustible substances. The first annular insulating member 20 and the second annular insulating member 21 are made of rubber, and the spring 23 keeps the second annular insulating member 21 always upwardly attached to the first annular insulating member 20, which can effectively prevent the electrical socket 24 and the electrical plug 19 from being soaked by rainwater.

[0030] like Figure 5 As shown, a groove 9 is provided at the bottom of the frame 2, and the first annular insulating member 20 and the tapered plug tube 10 are arranged in the groove 9 and do not protrude from the groove 9. The frame 2 can be placed directly on a flat ground without worrying about the tapered plug tube 10 and the electric plug 19 being crushed, and the groove 9 can also protect the plugged electric socket 24 and the socket tube 18.

[0031] The outer wall of the socket tube 18 is provided with an annular gas cover 13 which is communicated with the nitrogen pipe 8, and the annular gas cover 13 is covered on the gas outlet 17. The annular gas cover 13 can transport the nitrogen output by the nitrogen pipe 8 to each gas outlet 17.

[0032] A one-way valve 15 is provided in each of the gas outlet holes 17 below the sealing ring 16. The one-way valve 15 only allows nitrogen to move from the annular gas cover 13 to the socket tube 18, preventing hydrogen from entering the annular gas cover 13 and the nitrogen tube 8. After the conical plug tube 10 is connected to the socket tube 18, the second position sensor 14 detects the conical plug tube 10, and the solenoid valve 7 is closed. At this time, the pressure of hydrogen in the cavity is greater than the pressure of nitrogen, and the one-way valve 15 is closed, so that nitrogen no longer enters the socket tube 18. At the same time, since the high-pressure hydrogen supports the one-way valve 15, the one-way valve 15 is prevented from opening, and residual nitrogen can also be prevented from entering the socket tube 18 from the annular gas cover 13.

[0033] At least two fixing rods 5 are fixedly arranged on the vehicle body 1 and located on both sides of the frame 2. A limit insertion hole 501 is horizontally provided on the fixing rod 5. A locking device 4 cooperating with the limit insertion hole 501 is fixedly arranged on the outer side of the frame 2. The locking device 4 is inserted into the limit insertion hole 501 to realize the fixed installation of the frame 2 on the vehicle body 1. Preferably, the fixing rods 5 and the locking device 4 are arranged in an even number of not less than four groups, which can increase the stability of the connection.

[0034] The locking device 4 includes a mounting block 401, a positioning socket 402 for accommodating the fixing rod 5 is provided at the bottom of the mounting block 401, a working chamber 407 connected to the positioning socket 402 is provided in the mounting block 401, a driving plate 403 extending into the positioning socket 402 is hinged in the working chamber 407, a slot 412 penetrating the positioning socket 402 is provided in the mounting block 401 horizontally, a plug rod 409 is movably provided in the slot 412, a tension spring 410 is sleeved on the plug rod 409, one end of the tension spring 410 is connected to the outer surface of the mounting block 401 The working chamber 407 is fixedly connected to the wall, the other end of the tension spring 410 is fixedly connected to the tail end of the insertion rod 409, a slot 411 is provided on the upper surface of the insertion rod 409, a limit stop rod 408 is vertically movably arranged in the working chamber 407, the limit stop rod 408 is movably extended into the slot 412 and cooperates with the slot 411, and a lifting mechanism is provided in the working chamber 407 to cooperate with the driving plate 403 to drive the limit stop rod 408 to move upward, the lifting mechanism drives the limit stop rod 408 to move upward until the limit stop rod 408 is disengaged from the slot 411 and automatically releases the limit stop rod 408.

[0035] like Figure 6-8 As shown, after the fixing rod 5 is inserted into the positioning socket 402, the upper end of the fixing rod 5 abuts against the driving plate 403 and causes the driving plate 403 to deflect upward. The driving plate 403 pulls up the limit stopper 408 through the lifting mechanism to disengage from the slot 411. At this time, the insertion rod 409 receives the action of the tension spring 410 and moves to the left and passes through the limit socket 501, thereby realizing the locking of the locking device 4 and the fixing rod 5. After the driving plate 403 deflects upward to a certain position, the lifting mechanism releases the limit stopper 408. When the operator replaces the frame 2 next time, the insertion rod 409 is directly pulled out, and the slot 411 is aligned with the limit stopper 408, and then the insertion rod 409 is locked, thereby facilitating the installation and fixation of the frame 2.

[0036] Among them, the lower end of the positioning socket 402 is provided with a trumpet-shaped inlet to guide the insertion of the fixing rod 5. The heads of the fixing rod 5 and the plug rod 409 are both arc-shaped ball heads, which are convenient for guiding insertion and reducing wear. The plug rod 409 of the present application can be unlocked by manually pulling out to achieve hydrogen replacement or configure related electrical devices for automatic control, which will not be described here.

[0037] The lifting mechanism includes a rotating shaft 406 rotatably connected to a driving plate 403, two oppositely arranged hooks 404 are hinged in the rotating shaft 406, a driving block 405 is arranged at the top of the working chamber 407, a V-shaped groove 413 is arranged at the bottom of the driving block 405, a hook groove 414 cooperating with the hook 404 is formed on the limiting stop rod 408, a guiding inclined surface 416 is arranged at the upper end of the limiting stop rod 408, and an inclined surface 415 cooperating with the guiding inclined surface 416 is arranged at the bottom of the hook 404.

[0038] After the two hooks 404 hook the hook groove 414, the limit stop bar 408 can be lifted, and the rotating shaft 406 can keep the hooks 404 in a vertical state, so as to better lift the limit stop bar 408; when the driving plate 403 deflects upward to a certain position, the upper end of the hook 404 abuts the V-shaped groove 413 to drive the hook 404 to deflect and disengage from the hook groove 414, and the limit stop bar 408 is separated from the hook 404. When the fixing rod 5 is separated from the mounting block 401, the driving plate 403 deflects downward due to gravity, causing the hook 404 to fall, and after the hook 404 contacts the limit stop bar 408, the guiding inclined surface 416 cooperates with the inclined surface 415 to deflect the hook 404 and open it and buckle it onto the hook groove 414, so as to achieve the reconnection of the limit stop bar 408 and the hook 404.

[0039] The limit stop bar 408 is a square bar to prevent the circumferential rotation during the falling process. The weight value of the driving plate 403 is set to a value that enables the hook 404 to automatically deflect after falling and abutting the limit stop bar 408.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydrogen-exchange heavy truck, comprising a vehicle body (1), a frame (2) being detachably connected to the vehicle body (1), at least one hydrogen cylinder (3) being mounted on the frame (2), characterized in that: A conical plug tube (10) connected to the hydrogen cylinder (3) is arranged at the bottom of the frame (2); a socket tube (18) for matching the conical plug tube (10) is arranged on the vehicle body (1); a valve core assembly (11) for being pressed to open is elastically arranged in both the conical plug tube (10) and the socket tube (18); the elastic force of the valve core assembly (11) in the socket tube (18) is greater than the elastic force of the valve core assembly (11) in the conical plug tube (10); at least two groups of air outlet holes (17) located above the valve core assembly (11) are annularly arranged on the inner wall of the socket tube (18); the two groups of air outlet holes (17) are respectively connected to a nitrogen pipe (8); a solenoid valve (7) is arranged on the nitrogen pipe (8); and a sealing ring (16) is arranged between the two groups of air outlet holes (17).

2. A hydrogen-exchange heavy truck according to claim 1, characterized in that: The inner wall of the socket tube (18) is provided with a first position sensor (12) and a second position sensor (14) in sequence from top to bottom, the second position sensor (14) is located between the two groups of air outlet holes (17), the group of air outlet holes (17) located above is arranged between the first position sensor (12) and the second position sensor (14), and the first position sensor (12) and the second position sensor (14) are connected to the solenoid valve (7) via a controller.

3. A hydrogen-exchange heavy truck according to claim 1, characterized in that: The valve core assembly (11) comprises a guide frame (111) fixedly arranged on the inner wall of the pipeline, a guide rod (112) vertically and movably passing through the guide frame (111), a sealing plug (114) for sealing the pipeline being fixedly connected to the guide rod (112), and a return spring (113) abutting against the sealing plug (114) and the guide frame (111) being sleeved on the guide rod (112).

4. A hydrogen-exchange heavy truck according to claim 1, characterized in that: The bottom of the frame (2) is provided with an electric plug (19) and a first annular insulating member (20) sleeved on the outside of the electric plug (19), the electric plug (19) not protruding from the first annular insulating member (20), the vehicle body (1) is provided with an electric socket (24), the outside of the electric socket (24) is sleeved with a second annular insulating member (21) protruding from the electric socket (24), the vehicle body (1) is provided with an annular groove (22) for the second annular insulating member (21) to move vertically, and a spring (23) abutting against the second annular insulating member (21) is provided in the annular groove (22).

5. A hydrogen-exchange heavy truck according to claim 4, characterized in that: A groove (9) is provided at the bottom of the frame (2), and the first annular insulating member (20) and the tapered plug tube (10) are arranged in the groove (9) and do not protrude from the groove (9).

6. A hydrogen-exchange heavy truck according to claim 1, characterized in that: The outer wall of the socket tube (18) is provided with an annular gas cover (13) which is in communication with the nitrogen tube (8), and the annular gas cover (13) is provided on the gas outlet hole (17).

7. A hydrogen-exchange heavy truck according to claim 1, characterized in that: A one-way valve (15) is provided in each of the air outlet holes (17) located below the sealing ring (16).

8. The hydrogen-exchange heavy truck according to claim 1, characterized in that: At least two fixing rods (5) located on both sides of the frame (2) are fixedly arranged on the vehicle body (1), and a limit insertion hole (501) is horizontally provided on the fixing rod (5), and a locking device (4) cooperating with the limit insertion hole (501) is fixedly arranged on the outer side of the frame (2).

9. A hydrogen-exchange heavy truck according to claim 8, characterized in that: The locking device (4) comprises a mounting block (401), a positioning socket (402) for accommodating a fixing rod (5) is provided at the bottom of the mounting block (401), a working chamber (407) communicating with the positioning socket (402) is provided in the mounting block (401), a driving plate (403) extending into the positioning socket (402) is hingedly connected in the working chamber (407), a slot (412) penetrating the positioning socket (402) is provided in the mounting block (401) horizontally, a plug rod (409) is movably provided in the slot (412), a tension spring (410) is sleeved on the plug rod (409), one end of the tension spring (410) is connected to the mounting block (401), and a locking device (401) is provided at the bottom of the mounting block (401). 01), the other end of the tension spring (410) is fixedly connected to the rear end of the insertion rod (409), a slot (411) is provided on the upper surface of the insertion rod (409), a limit stop rod (408) is vertically movably provided in the working chamber (407), the limit stop rod (408) is movably extended into the slot (412) and cooperates with the slot (411), a lifting mechanism is provided in the working chamber (407) and cooperates with the driving plate (403) to drive the limit stop rod (408) to move upward, the lifting mechanism drives the limit stop rod (408) to move upward until the limit stop rod (408) is disengaged from the slot (411), and the limit stop rod (408) is automatically released.

10. A hydrogen-exchange heavy truck according to claim 9, characterized in that: The lifting mechanism comprises a rotating shaft (406) rotatably connected to a driving plate (403), two oppositely arranged hooks (404) are hinged in the rotating shaft (406), a driving block (405) is arranged at the top of the working chamber (407), a V-shaped groove (413) is arranged at the bottom of the driving block (405), a hook groove (414) cooperating with the hook (404) is formed on the limit stop rod (408), a guiding inclined surface (416) is arranged at the upper end of the limit stop rod (408), and an inclined surface (415) cooperating with the guiding inclined surface (416) is arranged at the bottom of the hook (404).

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