A hydrogen-refueled heavy truck

Abstract

The present invention provides a hydrogen refueling heavy truck, belonging to the technical field of hydrogen refueling heavy trucks, and solves the problem of potential safety hazards existing in the frequent plugging and unplugging of hydrogen connectors in the prior art. It includes a vehicle body, on which a frame is detachably connected. At least one hydrogen cylinder is installed on the frame. A conical plug tube communicating with the hydrogen cylinder is arranged at the bottom of the frame. A socket tube for accommodating the conical plug tube is arranged on the vehicle body. A valve core assembly for pressing to open is arranged in both the conical plug tube and the socket tube, and the elastic force of the valve core assembly in the socket tube is greater than that 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 above the valve core assembly. The two groups of air outlet holes are respectively communicated with nitrogen pipes. Solenoid valves are arranged on the nitrogen pipes, and a sealing ring is arranged between the two groups of air outlet holes. Setting two groups of air outlet holes to purge the oxygen in the socket tube increases the safety during the plugging process.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen refueling heavy trucks, and particularly relates to a hydrogen refueling heavy truck. Background Art

[0002] As an important type of new energy heavy trucks, hydrogen energy heavy trucks have advantages such as zero emissions and long endurance, and have broad application prospects in the fields of long-distance logistics and heavy transportation. The working principle of a hydrogen refueling heavy truck is similar to the battery swapping mode of an electric vehicle. When a hydrogen energy heavy truck needs to replenish energy, the driver only needs to remove the depleted 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, greatly shortening the hydrogen refueling time, and when the hydrogen storage device needs maintenance, it does not affect the continuous use of the hydrogen refueling heavy truck, undoubtedly improving the operation efficiency of the vehicle.

[0003] Existing hydrogen refueling heavy trucks use an up-and-down plugging method to quickly replace hydrogen cylinders and related frames. Due to factors such as static electricity, heat generated by friction, and even sparks during the plugging process, there are safety hazards in plugging hydrogen connectors in an oxygen-containing environment. Summary of the Invention

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

[0005] The technical solution adopted by the present invention is as follows:

[0006] A hydrogen refueling heavy truck includes a vehicle body. A frame is detachably connected to the vehicle body, and at least one hydrogen cylinder is installed on the frame. A conical plug pipe communicating with the hydrogen cylinder is provided at the bottom of the frame. A socket pipe for matching the conical plug pipe is provided on the vehicle body. A valve core assembly for pressing and opening is elastically provided in both the conical plug pipe and the socket pipe, and the elastic force of the valve core assembly in the socket pipe is greater than that of the valve core assembly in the conical plug pipe. At least two groups of air outlet holes are annularly provided on the inner wall of the socket pipe above the valve core assembly. The two groups of air outlet holes are respectively communicated with nitrogen pipes. Solenoid valves are provided on the nitrogen pipes, and a sealing ring is provided between the two groups of air outlet holes.

[0007] Preferably, a first position sensor and a second position sensor are sequentially provided on the inner wall of the socket pipe from top to bottom. The second position sensor is located between the two groups of air outlet holes. The upper group of air outlet holes is provided between the first position sensor and the second position sensor. The first position sensor and the second position sensor are connected to the solenoid valve through a controller.

[0008] Preferably, the spool assembly includes a guide frame fixedly arranged on the inner wall of the pipeline. A guide rod vertically penetrates through the guide frame movably. A sealing plug for sealing the pipeline is fixedly connected to the guide rod. A return spring abutting against the sealing plug and the guide frame is sleeved on the guide rod.

[0009] Preferably, an electrical plug and a first annular insulating member sleeved outside the electrical plug are arranged at the bottom of the frame. The electrical plug does not protrude from the first annular insulating member. An electrical socket is arranged on the vehicle body. A second annular insulating member protruding from the electrical socket is sleeved outside the electrical socket. An annular groove for the second annular insulating member to move vertically is formed on the vehicle body. A spring abutting against the second annular insulating member is arranged in the annular groove.

[0010] Preferably, a groove is formed at the bottom of the frame. The first annular insulating member and the conical plug pipe are arranged in the groove and do not protrude from the groove.

[0011] Preferably, an annular air hood communicated with the nitrogen pipe is arranged on the outer wall of the socket pipe. The annular air hood covers the air outlet hole.

[0012] Preferably, one-way valves are arranged in the air outlet holes below the sealing ring.

[0013] Preferably, at least two fixing rods are fixedly arranged on the vehicle body on both sides of the frame. A limiting jack is transversely formed on the fixing rod. A locking device matched with the limiting jack is fixedly arranged on the outer side of the frame.

[0014] Preferably, the locking device includes a mounting block. A positioning jack for accommodating the fixing rod is formed at the bottom of the mounting block. A working cavity communicated with the positioning jack is formed in the mounting block. A driving plate extending into the positioning jack is hinged in the working cavity. A slot penetrating through the positioning jack is transversely formed in the mounting block. A plug rod is movably arranged in the slot. A tension spring is sleeved on the plug rod. One end of the tension spring is fixedly connected to the outer wall of the mounting block, and the other end of the tension spring is fixedly connected to the tail end of the plug rod. A clamping groove is formed on the upper surface of the plug rod. A limiting stop rod is vertically movably arranged in the working cavity. The limiting stop rod movably extends into the slot and is matched with the clamping groove. A lifting mechanism for driving the limiting stop rod to move upward in cooperation with the driving plate is arranged in the working cavity. The lifting mechanism drives the limiting stop rod to move upward until the limiting stop rod disengages from the clamping groove and then automatically releases the limiting stop rod.

[0015] 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 arranged at the top of the working cavity. A V-shaped groove is formed at the bottom of the driving block. A hook groove matched with the hook is formed on the limiting stop rod. A guiding inclined surface is arranged at the upper end of the limiting stop rod. An inclined surface matched with the guiding inclined surface is formed at the bottom of the hook.

[0016] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0017] Two groups of air outlet holes 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, increasing the safety during the plugging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 The front view structural schematic diagram provided for the embodiment of the present invention;

[0020] Figure 2 For Figure 1 The enlarged structural schematic diagram at A in

[0021] Figure 3 The schematic diagram of the open state of the conical plug tube provided for the embodiment of the present invention;

[0022] Figure 4 The schematic diagram of the open state of the socket tube provided for the embodiment of the present invention;

[0023] Figure 5 For Figure 1 The enlarged structural schematic diagram at B in

[0024] Figure 6 The structural schematic diagram of the locking device provided for the embodiment of the present invention;

[0025] Figure 7 The three-dimensional structural schematic diagram of the lifting mechanism provided for the embodiment of the present invention;

[0026] Figure 8 The schematic diagram of the use state of the locking device provided for the embodiment of the present invention.

[0027] Reference numerals: 1 - vehicle body; 2 - frame; 3 - hydrogen cylinder; 4 - locking device; 401 - mounting block; 402 - positioning jack; 403 - drive plate; 404 - hook; 405 - drive block; 406 - rotating shaft; 407 - working chamber; 408 - limiting stop bar; 409 - inserting rod; 410 - tension spring; 411 - clamping groove; 412 - slot; 413 - V-shaped groove; 414 - hook groove; 5 - fixing rod; 415 - inclined surface; 416 - guiding inclined surface; 501 - limiting jack; 6 - nitrogen cylinder; 7 - solenoid valve; 8 - nitrogen pipe; 9 - groove; 10 - tapered plug tube; 11 - valve core assembly; 111 - guiding frame; 112 - guiding rod; 113 - return spring; 114 - sealing plug; 12 - first position sensor; 13 - annular air hood; 14 - second position sensor; 15 - one-way valve; 16 - sealing ring; 17 - air outlet hole; 18 - socket tube; 19 - electrical plug; 20 - first annular insulating member; 21 - second annular insulating member; 22 - annular groove; 23 - spring; 24 - electrical socket. Detailed implementation manners

[0028] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0031] The following is a detailed description of the present invention in conjunction with Figures 1-8 for the present invention.

[0032] Embodiment:

[0033] A hydrogen-refueling heavy truck, asFigure 1 and 2 As shown in 2 , 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 communicating with 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 and opening 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 that of the valve core assembly 11 in the conical plug tube 10. At least two groups of air outlet holes 17 are annularly arranged on the inner wall of the socket tube 18 above the valve core assembly 11. The two groups of air outlet holes 17 are respectively communicated with nitrogen pipes 8, electromagnetic valves 7 are arranged on the nitrogen pipes 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 after the multiple hydrogen cylinders 3 are communicated through pipelines and finally connected to the conical plug tube 10, the connection method will not be elaborated here.

[0034] A nitrogen cylinder 6 is arranged on the vehicle body 1, the nitrogen cylinder 6 is communicated with the nitrogen pipe 8, and lifting lugs are arranged on the frame 2 for convenient lifting; during the process of lifting and hydrogen replacement, the conical plug tube 10 is inserted into the socket tube 18. During the insertion process, the two groups of air outlet holes 17 first purge the inside of the socket tube 18 with nitrogen at the same time, ensuring that the insertion space only contains nitrogen, avoiding the ignition of hydrogen, and at the same time, it can also blow out the dust on the inner wall of the socket tube 18; when the conical plug tube 10 passes through the upper air outlet hole 17, the lower air outlet hole 17 closes the nitrogen pipe 8 through the electromagnetic 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 cylinder 3 is discharged from the conical plug tube 10. At this time, the sealing ring 16 has not yet adhered to the outer wall of the conical plug tube 10.

[0035] As Figure 3 shown, hydrogen purges the nitrogen in the socket tube 18, avoiding the mixing of nitrogen and affecting the purity of hydrogen. The purged hydrogen is discharged from the gap between the sealing ring 16 and the conical plug tube 10 and is mixed with the nitrogen discharged from the upper air outlet hole 17, avoiding the mixing of hydrogen and oxygen; as Figure 4 shown, after the valve core assembly 11 in the conical plug tube 10 is pushed open a certain distance, the valve core assembly 11 in the socket tube 18 is pushed open, so as to realize the connection between the conical plug tube 10 and the socket tube 18. At this time, the sealing ring 16 adheres to the outer wall of the conical plug tube 10, avoiding the entry of external gas into the hydrogen channel. The upper air outlet hole 17 closes the nitrogen pipe 8 through the electromagnetic valve 7 to stop purging, thus completing the insertion operation of the hydrogen pipeline.

[0036] The inner wall of the socket pipe 18 is successively provided with a first position sensor 12 and a second position sensor 14 from top to bottom. The second position sensor 14 is located between two groups of air outlet holes 17. One group of air outlet holes 17 located above is arranged 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 conical plug pipe 10 reaches the specified position. When the first position sensor 12 monitors the conical plug pipe 10, the solenoid valve 7 is controlled to open through the controller, and nitrogen purging is carried out simultaneously at the two groups of air outlet holes 17. When the second position sensor 14 monitors the conical plug pipe 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 in the upper nitrogen pipe 8 to be closed regularly.

[0037] The valve core assembly 11 includes a guide frame 111 fixedly arranged on the inner wall of the pipeline. A guide rod 112 vertically penetrates through the guide frame 111 movably. A sealing plug 114 for sealing the pipeline is fixedly connected to the guide rod 112. A return spring 113 that abuts against the sealing plug 114 and the guide frame 111 is sleeved on the guide rod 112. The sealing plug 114 can perform axial displacement through the cooperation of the guide rod 112 and the guide frame 111. The return spring 113 keeps the sealing plug 114 in close contact with the pipe orifice for sealing to prevent air leakage. The guide frame 111 allows gas to flow through. The elastic force of the valve core assembly 11 in the socket pipe 18 is greater than the elastic force of the valve core assembly 11 in the conical plug pipe 10, that is, the elastic force of the lower return spring 113 is greater than the elastic force of the upper return spring 113. Therefore, during the insertion of the conical plug pipe 10, the upper valve core assembly 11 is opened first, and then the lower valve core assembly 11 is pushed open.

[0038] At the bottom of the frame 2, there is an electrical plug 19 and a first annular insulating member 20 sleeved outside the electrical plug 19. The electrical plug 19 does not protrude from the first annular insulating member 20. On the vehicle body 1, there is an electrical socket 24. Outside the electrical socket 24, there is a second annular insulating member 21 that protrudes from the electrical socket 24. On the vehicle body 1, there is an annular groove 22 for the second annular insulating member 21 to move vertically. In the annular groove 22, there is a spring 23 that abuts against the second annular insulating member 21. After the electrical socket 24 is connected to the electrical plug 19, the battery on the vehicle powers relevant electrical appliances (such as various sensors, solenoid valves, electronic meters) on the frame 2. During the connection process between the electrical socket 24 and the electrical plug 19, electric sparks will be generated. Therefore, the first annular insulating member 20 and the second annular insulating member 21 are provided to fit and shield the electric sparks before the electrical socket 24 contacts the electrical plug 19, preventing the electric sparks from igniting hydrogen or other combustible substances. Among them, 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 fitting upward against the first annular insulating member 20, effectively preventing the electrical socket 24 and the electrical plug 19 from being soaked by rainwater.

[0039] As Figure 5 shown, a groove 9 is provided at the bottom of the frame 2. 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 directly placed on the ground without worrying about the tapered plug tube 10 and the electrical plug 19 being crushed. At the same time, the groove 9 can also protect the electrical socket 24 and the socket tube 18 after insertion.

[0040] On the outer wall of the socket tube 18, there is an annular air hood 13 connected to the nitrogen gas pipe 8. The annular air hood 13 covers the air outlet holes 17. The annular air hood 13 can deliver the nitrogen gas output from the nitrogen gas pipe 8 to each air outlet hole 17.

[0041] One-way valves 15 are provided in the air outlet holes 17 below the sealing ring 16. The one-way valves 15 only allow nitrogen gas to move from the annular air hood 13 into the socket tube 18, preventing hydrogen from entering the annular air hood 13 and the nitrogen gas pipe 8. After the tapered plug tube 10 is connected to the socket tube 18, the second position sensor 14 monitors the tapered plug tube 10, and the solenoid valve 7 closes. At this time, the pressure of the hydrogen gas in the cavity is greater than the pressure of the nitrogen gas, which causes the one-way valve 15 to be in a closed state, stopping the nitrogen gas from entering the socket tube 18. At the same time, due to the high-pressure hydrogen gas pressing against the one-way valve 15, the one-way valve 15 is prevented from opening, and the residual nitrogen gas is also prevented from entering the socket tube 18 from the annular air hood 13.

[0042] There are at least two fixing rods 5 fixed on the vehicle body 1 on both sides of the frame 2. A limiting jack 501 is transversely opened on the fixing rod 5, and a locking device 4 cooperating with the limiting jack 501 is fixedly arranged on the outer side of the frame 2. The locking device 4 fixes and installs the frame 2 on the vehicle body 1 by inserting into the limiting jack 501. Preferably, the fixing rod 5 and the locking device 4 are set to an even number of groups not less than four groups, which can increase the connection stability.

[0043] The locking device 4 includes a mounting block 401. A positioning jack 402 for accommodating the fixing rod 5 is opened at the bottom of the mounting block 401. A working cavity 407 communicating with the positioning jack 402 is opened in the mounting block 401. A driving plate 403 extending into the positioning jack 402 is hinged in the working cavity 407. A slot 412 penetrating the positioning jack 402 is transversely opened in the mounting block 401. A plug rod 409 is movably arranged in the slot 412. A tension spring 410 is sleeved on the plug rod 409. One end of the tension spring 410 is fixedly connected to the outer wall of the mounting block 401, and the other end of the tension spring 410 is fixedly connected to the tail end of the plug rod 409. A clamping groove 411 is opened on the upper surface of the plug rod 409. A limiting stop rod 408 is vertically movably arranged in the working cavity 407. The limiting stop rod 408 movably extends into the slot 412 and cooperates with the clamping groove 411. A lifting mechanism for driving the limiting stop rod 408 to move upward in cooperation with the driving plate 403 is arranged in the working cavity 407. After the lifting mechanism drives the limiting stop rod 408 to move upward until the limiting stop rod 408 disengages from the clamping groove 411, the limiting stop rod 408 is automatically released.

[0044] As Figures 6-8 shown, after the fixing rod 5 extends into the positioning jack 402, the upper end of the fixing rod 5 abuts against the driving plate 403 and deflects the driving plate 403 upward. The driving plate 403 pulls up the limiting stop rod 408 through the lifting mechanism to disengage from the clamping groove 411. At this time, the plug rod 409 moves leftward under the action of the tension spring 410 and penetrates through the limiting jack 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 limiting stop rod 408. When the operator replaces the frame 2 next time, the plug rod 409 is directly pulled out, and after the clamping groove 411 is aligned with the limiting stop rod 408, the plug rod 409 is locked, thereby facilitating the installation and fixation of the frame 2.

[0045] Among them, a horn-shaped inlet is arranged at the lower end of the positioning jack 402 to facilitate the guiding 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 manual pulling out to realize hydrogen replacement or configure relevant electrical devices for automatic control, which will not be elaborated here.

[0046] The lifting mechanism includes a rotating shaft 406 rotatably connected to the 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 cavity 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. An inclined surface 415 cooperating with the guiding inclined surface 416 is arranged at the bottom of the hook 404.

[0047] After the two hooks 404 hook the hook groove 414, the limit stop rod 408 can be lifted. The rotating shaft 406 can keep the hook 404 in a vertical state, so as to better lift the limit stop rod 408. When the driving plate 403 deflects upward to a certain position, the upper end of the hook 404 abuts against the V-shaped groove 413 to drive the hook 404 to deflect and disengage from the hook groove 414, and the limit stop rod 408 disengages from the hook 404. When the fixed rod 5 disengages from the mounting block 401, the driving plate 403 deflects downward due to the action of gravity, causing the hook 404 to fall. After the hook 404 contacts the limit stop rod 408, the guiding inclined surface 416 cooperates with the inclined surface 415 to make the hook 404 deflect and open and latch onto the hook groove 414, thereby realizing the reconnection between the limit stop rod 408 and the hook 404.

[0048] Among them, the limit stop rod 408 is a square rod to prevent circumferential rotation during the falling process. The weight value of the driving plate 403 is set to a value that can automatically deflect after the hook 404 falls and abuts against the limit stop rod 408.

[0049] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. 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 - refueling heavy - duty truck, comprising a vehicle body (1), a frame (2) detachably connected to the vehicle body (1), and at least one hydrogen cylinder (3) mounted on the frame (2), characterized in that, A conical plug tube (10) communicating with a hydrogen cylinder (3) is provided at the bottom of the frame (2). A socket tube (18) for mating with the conical plug tube (10) is provided on the vehicle body (1). A valve core assembly (11) for pressing and opening is elastically provided 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 that of the valve core assembly (11) in the conical plug tube (10). At least two groups of air outlet holes (17) are annularly provided on the inner wall of the socket tube (18) above the valve core assembly (11). The two groups of air outlet holes (17) are respectively communicated with nitrogen pipes (8). An electromagnetic valve (7) is provided on the nitrogen pipe (8). A sealing ring (16) is provided between the two groups of air outlet holes (17); The valve core assembly (11) includes a guide frame (111) fixedly provided on the inner wall of the pipeline. A guide rod (112) is vertically movably penetrated through the guide frame (111). A sealing plug (114) for blocking the pipeline is fixedly connected to the guide rod (112). A return spring (113) abutting against the sealing plug (114) and the guide frame (111) is sleeved on the guide rod (112); During the plugging process, the two groups of air outlet holes (17) first purge the inside of the socket tube (18) with nitrogen at the same time, ensuring that only nitrogen exists in the plugging space to avoid hydrogen from being ignited. At the same time, it can also blow out the dust on the inner wall of the socket tube (18); When the conical plug tube (10) passes through the upper air outlet hole (17), the lower air outlet hole (17) closes the nitrogen pipe (8) through the electromagnetic valve (7) to stop purging. 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 cylinder (3) is discharged from the conical plug tube (10). At this time, the sealing ring (16) has not yet adhered to the outer wall of the conical plug tube (10); The hydrogen purges the nitrogen in the socket tube (18) to avoid the influence of nitrogen mixing on the purity of hydrogen. The purged hydrogen is discharged from the gap between the sealing ring (16) and the conical plug tube (10) and is mixed with the nitrogen discharged from the upper air outlet hole (17) to avoid the mixing of hydrogen and oxygen; After the valve core assembly (11) in the conical plug tube (10) is pushed open by a certain distance, the valve core assembly (11) in the socket tube (18) is pushed open, thus realizing the connection between the conical plug tube (10) and the socket tube (18). At this time, the sealing ring (16) adheres to the outer wall of the conical plug tube (10) to avoid external gas from entering the hydrogen channel. The upper air outlet hole (17) closes the nitrogen pipe (8) through the electromagnetic valve (7) to stop purging, thereby completing the plugging operation of the hydrogen pipeline.

2. The hydrogen replacement heavy truck according to claim 1, characterized in that The inner wall of the socket pipe (18) is successively provided with a first position sensor (12) and a second position sensor (14) from top to bottom. The second position sensor (14) is located between two groups of air outlet holes (17). One group of air outlet holes (17) located above is arranged 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.

3. The hydrogen replacement heavy truck according to claim 1, wherein A power plug (19) and a first annular insulating member (20) sleeved outside the power plug (19) are arranged at the bottom of the frame (2). The power plug (19) does not protrude from the first annular insulating member (20). A power socket (24) is arranged on the vehicle body (1). A second annular insulating member (21) protruding from the power socket (24) is sleeved outside the power socket (24). An annular groove (22) for the vertical movement of the second annular insulating member (21) is formed on the vehicle body (1). A spring (23) abutted against the second annular insulating member (21) is arranged in the annular groove (22).

4. The hydrogen replacement heavy truck according to claim 3, characterized in that, A groove (9) is formed at the bottom of the frame (2). The first annular insulating member (20) and the conical plug pipe (10) are arranged in the groove (9) and do not protrude from the groove (9).

5. The hydrogen replacement heavy truck according to claim 1, characterized in that, An annular air hood (13) communicated with the nitrogen gas pipe (8) is arranged on the outer wall of the socket pipe (18). The annular air hood (13) covers the air outlet holes (17).

6. The hydrogen replacement heavy truck according to claim 1, characterized in that, One-way valves (15) are arranged in the air outlet holes (17) below the sealing ring (16).

7. A hydrogen replacement 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). A limiting jack (501) is horizontally formed in the fixing rod (5). A locking device (4) matched with the limiting jack (501) is fixedly arranged on the outer side of the frame (2).

8. The hydrogen replacement heavy truck according to claim 7, characterized in that, The latch device (4) includes a mounting block (401). A positioning socket (402) for accommodating a fixing rod (5) is formed at the bottom of the mounting block (401). A working cavity (407) communicating with the positioning socket (402) is formed in the mounting block (401). A driving plate (403) extending into the positioning socket (402) is hinged in the working cavity (407). A slot (412) penetrating the positioning socket (402) is transversely formed in the mounting block (401). A plug rod (409) is movably arranged in the slot (412). A tension spring (410) is sleeved on the plug rod (409). One end of the tension spring (410) is fixedly connected to the outer wall of the mounting block (401), and the other end of the tension spring (410) is fixedly connected to the tail end of the plug rod (409). A clamping groove (411) is formed on the upper surface of the plug rod (409). A limiting stop rod (408) is vertically movably arranged in the working cavity (407). The limiting stop rod (408) movably extends into the slot (412) to cooperate with the clamping groove (411). A lifting mechanism for driving the limiting stop rod (408) to move upward in cooperation with the driving plate (403) is arranged in the working cavity (407). After the lifting mechanism drives the limiting stop rod (408) to move upward until the limiting stop rod (408) disengages from the clamping groove (411), the limiting stop rod (408) is automatically released.

9. The hydrogen replacement heavy truck according to claim 8, wherein The lifting mechanism includes a rotating shaft (406) rotatably connected to the 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 cavity (407). A V-shaped groove (413) is formed 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). An inclined surface (415) cooperating with the guiding inclined surface (416) is arranged at the bottom of the hook (404).

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