A fuel tank

Abstract

The application discloses a fuel tank, which comprises a tank body, a fixing mechanism connected with the tank body and used for fixing the tank body on a vehicle body, a buffer mechanism connected with the fixing mechanism and installed outside the tank body, a part of the buffer mechanism moving towards the fixing mechanism when the tank body is impacted by an external object to buffer part of impact force generated by the impact, and a pushback mechanism connected with the fixing mechanism and linked with the buffer mechanism, a part of the pushback mechanism moving away from the fixing mechanism when a part of the buffer mechanism moves towards the fixing mechanism and bearing the impact of the external object together with the buffer mechanism. The fuel tank provided by the application can reduce the impact force generated by the impact of the external object, avoid the damage of the tank body, and reduce the probability of ignition caused by fuel leakage when the tank body is impacted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile fuel tank. BACKGROUND

[0002] The fuel tank, namely the fuel storage device, has high corrosion resistance requirement. When the double working pressure is at least 0.03 MPa, the fuel tank should be sealed, the overpressure generated should be automatically reduced through a hole or a safety valve, the fuel should not flow out from the sealed cover or the pressure balancing device during the curve driving, the inclined road or the impact, the fuel tank should be installed away from the engine to avoid igniting the fuel in the event of a traffic accident, and the fuel tank is a relatively closed system, and the fuel tank is usually provided with a ventilation device to prevent deformation under the action of the pressure difference between the tank and the atmosphere due to excessive consumption of the oil. The positions of fuel tanks of different vehicles are different, and in particular, large vehicles usually use large fuel tanks in order to have a large oil storage capacity, so the fuel tank is usually installed on one side of the vehicle.

[0003] Now the existing fuel tank usually adopts a steel plate structure, but during the driving of the vehicle, accidents are inevitable, which causes the fuel tank to collide with the outside world, and after the collision, damage is easy to occur, and the external object colliding with the fuel tank is usually extruded on the outside of the fuel tank, which is easy to cause the fuel tank to be continuously pressed, and after the fuel tank is damaged and the fuel leaks, the fuel is easy to be ignited, causing secondary damage. SUMMARY

[0004] Therefore, the present application provides a fuel tank, which is provided with a buffer mechanism, a pushback mechanism and a fireproof mechanism, so as to effectively reduce the impact force when the fuel tank is hit by an external object, and to effectively avoid the problem of ignition of the fuel tank due to impact, thereby improving the use safety of the fuel tank.

[0005] The fuel tank provided by the present application comprises a tank body, a fixing mechanism connected with the tank body and used for fixing the tank body on the vehicle body, a buffer mechanism connected with the fixing mechanism and installed outside the tank body, part of the buffer mechanism moving towards the fixing mechanism when the tank body is hit by an external object, so as to buffer part of the impact force generated by the impact, and a pushback mechanism connected with the fixing mechanism and linked with the buffer mechanism, part of the pushback mechanism moving away from the fixing mechanism when part of the buffer mechanism moves towards the fixing mechanism, and the pushback mechanism and the buffer mechanism together bearing the impact of the external object.

[0006] Further, the buffer mechanism comprises a plurality of sets of buffer rods arranged on the upper and lower surfaces of the box, a first sleeve sealingly connected to one end of the buffer rod, and a bumper ring connected to the other end of the buffer rod, the bumper ring is in contact with the external object when the box is impacted by the external object, and the buffer rod moves towards the fixing mechanism under the pushing of the bumper ring; the pushback mechanism comprises a plurality of sets of pushback rods, a second sleeve sealingly connected to one end of the pushback rod, and a pushback plate connected to the other end of the pushback rod, the interior of the second sleeve is fluidly connected to the interior of the first sleeve, and when the buffer rod moves towards the fixing mechanism, the fluid in the first sleeve and the second sleeve pushes the pushback rod to move away from the fixing mechanism, driving the pushback plate to move towards the external object.

[0007] Further, the fixing mechanism comprises a fixing plate connected to the rear surface of the box, two parallel communication pipes are arranged in the interior of the fixing plate, higher than the upper surface of the box and lower than the lower surface of the box, the communication pipes are filled with oil, the first sleeve and the second sleeve are alternately connected to the communication pipes away from the buffer rod and the pushback rod, the first sleeve and the second sleeve are respectively provided with a buffer spring and a push spring, and after the bumper ring is impacted by the external object, the buffer rod compresses the buffer spring towards the fixing plate, the oil in the communication pipe is pushed to the interior of the second sleeve, and the pushback rod moves away from the fixing plate.

[0008] Further, the side edge of the pushback plate is connected with a moving plate, the left and right sides of the pushback plate close to the box are both connected with a first lug plate, a plurality of through holes are arranged on the first lug plate, the side of the moving plate away from the box is connected with a second lug plate close to the pushback plate, a plurality of limiting rods corresponding to the through holes are vertically arranged on the second lug plate, and second limiting blocks are further arranged at the top ends of the limiting rods; a return spring is further arranged around the limiting rods between the second lug plate and the first lug plate, and the moving plate is fixed to the two sides of the pushback plate through cooperation of the through holes and the limiting rods.

[0009] Further, the buffer mechanism further comprises a cross rod, the cross rod connects a plurality of bumper rings together in the transverse direction, the side of the cross rod facing the pushback plate is provided with a first clamping groove, and the pushback plate is provided with a second clamping groove corresponding to the first clamping groove; during the movement of the pushback plate, the second clamping groove on the pushback plate is clamped with the first clamping groove arranged on the cross rod, and when the second clamping groove is clamped with the first clamping groove, the moving plate moves towards the box relative to the pushback plate.

[0010] Further, the moving plate is provided with a plurality of protrusions on the side close to the box, the push-back plate and the moving plate are provided with fire-retardant plates on the side close to the box, the fire-retardant plates are internally provided with a plurality of fire-retardant grooves, the fire-retardant grooves are internally filled with fire-retardant agents, the outer surfaces of the fire-retardant agents are provided with sealing films, and when the moving plate moves relative to the push-back plate, the protrusions on the moving plate can break the sealing films to make the fire-retardant grooves release the fire-retardant agents.

[0011] Further, the push-back plate is provided with first limiting blocks at the upper and lower ends of the side close to the box, and the fire-retardant plates are provided with mounting openings at the upper and lower ends, which cooperate with the first limiting blocks to mount the fire-retardant plates on the side of the push-back plate close to the box.

[0012] Further, the fixing mechanism further comprises side plates protruding out of the left and right edges of the box and located at the upper and lower sides of the box, support frames are connected between the two side plates at the left and right sides of the box, and the box is located between the support frames.

[0013] Further, the fixing plate is provided with an I-shaped frame on the side away from the box, and the I-shaped frame is connected with the vehicle body through bolts.

[0014] Further, the anti-collision ring is provided with a buffer ball pad on the side close to the box, the upper and lower ends of the front surface of the box are provided with a plurality of buffer grooves, the outer walls of the buffer grooves are attached with soft rubber pads matched with the buffer ball pad, and the buffer grooves are internally provided with a plurality of combined ball rods, and the combined ball rods form a cross-shaped net structure.

[0015] Compared with the prior art, the present application has the following beneficial technical effects:

[0016] The fuel tank provided by this invention, through the inclusion of a buffer mechanism and a push-back mechanism, ensures that when an external object impacts the fuel tank during vehicle operation, it first strikes the buffer mechanism. The buffer mechanism then transmits the impact force to the push-back mechanism, which in turn generates a thrust force on the buffer mechanism. This effectively reduces the impact of external objects on the fuel tank, extends its service life, and solves the problem of easy damage to the fuel tank. Furthermore, through the inclusion of a push-back mechanism and a flame-retardant mechanism, after the push-back mechanism engages with the buffer mechanism, the protrusions on the moving plate squeeze and break the sealing film on the flame-retardant plate. This allows the flame retardant in the flame-retardant groove to be sprayed onto the outside of the fuel tank under pressure. The multiple sets of flame-retardant grooves surrounding the outside of the fuel tank ensure that the flame retardant is evenly sprayed onto the outer wall of the fuel tank, effectively reducing the probability of the fuel tank igniting due to impact. This effectively solves the problem of secondary damage caused by leaked fuel and improves safety during use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the fuel tank of the present invention;

[0018] Figure 2 This is a partial structural diagram of the fixing mechanism in this invention;

[0019] Figure 3 This is a partial structural cross-sectional schematic diagram of the buffer mechanism and the push mechanism in this invention;

[0020] Figure 4 This is a schematic cross-sectional view of the anti-collision ring and the housing in this invention;

[0021] Figure 5 This is a schematic cross-sectional view of the push plate and the insert plate in this invention;

[0022] Figure 6 This is a schematic diagram of the installation structure of the push plate and the moving plate in this invention;

[0023] Figure 7 This is a schematic diagram of the structure of the movable plate in this invention;

[0024] Figure 8 This is a cross-sectional schematic diagram of the push plate, the moving plate, and the flame-retardant plate in this invention;

[0025] Figure 9 This is a schematic diagram of the flame-retardant plate in this invention.

[0026] Wherein: 10 - box; 11 - buffer tank; 12 - soft rubber pad; 13 - combination club; 20 - fixing mechanism; 21 - fixed plate; 211 - communication pipe; 22 - I-shaped frame; 23 - bolt; 24 - fixing frame; 241 - side plate; 242 - support frame; 30 - buffer mechanism; 31 - buffer rod; 32 - buffer spring; 33 - anti-collision ring; 34 - first connecting plate; 35 - cross rod; 351 - first clamping groove; 36 - outer coil plate; 37 - buffer ball pad; 38 - first sleeve; 40 - pushback mechanism; 41 - pushback rod; 42 - push spring; 43 - pushback plate; 431 - second clamping groove; 432 - first limiting block; 44 - second connecting plate; 45 - moving plate; 451 - protrusion; 46 first protruding plate; 461 - through hole; 47 - second protruding plate; 471 - limiting rod; 472 - second limiting block; 473 - return spring; 48 - second sleeve; 50 - fire-retardant mechanism; 51 - fire-retardant plate; 52 - mounting port; 53 - fire-retardant groove; 54 - sealing film. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0028] In the description of the present application, it should be noted that the orientation or positional relationship indicated in the description is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0029] Please refer to Figure 1 The fuel tank provided by the present application comprises a box 10, a fixing mechanism 20 connected with the box 10 and used for fixing the box 10 on a vehicle body, a buffer mechanism 30 connected with the fixing mechanism 20 and installed outside the box 10, a part of the buffer mechanism 30 moving towards the fixing mechanism 20 when the box 10 is impacted by an external object, so as to buffer part of the impact force generated by the impact, a pushback mechanism 40 connected with the fixing mechanism 20 and linked with the buffer mechanism 30, a part of the pushback mechanism 40 moving away from the fixing mechanism 20 when a part of the buffer mechanism 30 moves towards the fixing mechanism 20, and the pushback mechanism 40 and the buffer mechanism 30 together bearing the impact of the external object, and a fire-retardant mechanism 50 (see Figure 9 ) connected with the pushback mechanism 40 and used for releasing fire retardant to avoid the box 10 from being ignited due to the impact of the external object.

[0030] Specifically, please refer to Figures 1-2The fixing mechanism 20 comprises a fixing plate 21 connected with the rear surface of the box 10, a I-shaped frame 22 is installed on the rear surface of the fixing plate 21, the I-shaped frame 22 is connected with the vehicle body through bolts 23 to fix the box 10 on the vehicle body, two parallel communication pipes 211 are arranged inside the fixing plate 21 which are higher than the upper surface of the box 10 and lower than the lower surface of the box 10, and the communication pipes 211 are filled with hydraulic oil.

[0031] The fixing mechanism 20 further comprises fixing frames 24 connected with the left and right ends of the upper surface and the left and right ends of the lower surface of the box 10, the rear ends of the fixing frames 24 are aligned and connected with the left and right edges of the fixing plate 21, the outer sides of the fixing frames 24 are connected with edge plates 241 which are flush with the fixing frames 24, support frames 242 are connected between the edge plates 241 on the left side of the box 10 and between the edge plates 241 on the right side of the box 10, the fixing frames 24, the edge plates 241 and the support frames 242 are used to prevent the box 10 from moving to the left and right sides and fix the box 10.

[0032] Please refer to Figure 1 and Figure 3 The buffer mechanism 30 comprises a plurality of groups of buffer rods 31 arranged on the upper and lower surfaces of the box 10, a first sleeve 38 connected with one end of the buffer rod 31, and a crash ring 33 connected with the other end of the buffer rod 31, the end of the first sleeve 38 away from the buffer rod 31 is connected with the communication pipe 211 on the fixing plate 21, the inside of the first sleeve 38 is provided with a buffer spring 32, and the inside of the sleeve is filled with hydraulic oil. The crash ring 33 is connected with the buffer rod 31 through a first connecting plate 34. Adjacent crash rings 33 are connected with cross bars 35, the cross bars 35 connect a plurality of crash rings 33 together in the transverse direction, and the side of the cross bar 35 facing the push-back plate 43 is provided with a first clamping groove 351. When an external object hits the box 10, the crash ring 33 is first hit by the external object, the impact force generated will drive the buffer rod 31 to move towards the fixing plate 21 and thus press the buffer spring 32, and due to the buffering effect of the buffer mechanism 30, the impact force of the external object on the box 10 can be reduced.

[0033] Further, please refer to Figure 4, the box 10 is close to the upper and lower ends of a side of the buffer mechanism 30 is equipped with a plurality of groups of buffer groove 11, the outer wall of the buffer groove 11 is attached to the soft rubber pad 12, the inside of the buffer groove 11 is equipped with a plurality of groups of combined ball rod 13, the plurality of groups of combined ball rod 13 forms a cross network structure. The anti-collision ring 33 is close to a side of the box 10 is equipped with a position corresponding to the soft rubber pad 12 buffer ball pad 37. When being hit by external objects, unable to pass through the buffer mechanism 30 buffer impact force will drive the anti-collision ring 33 hit the box 10, due to the existence of the buffer ball pad 37 and soft rubber pad 12, also can buffer part of the impact force, and the combined ball rod 13 can be plastic deformation when the impact, the impact force is absorbed, thereby avoiding the box 10 is damaged by impact.

[0034] Please refer to Figure 1 and Figure 3 , the pushback mechanism 40 includes a plurality of groups of pushback rod 41 arranged alternately with the buffer rod 31, the second sleeve 48 connected with one end of the pushback rod 41, the pushback plate 43 connected with the other end of the pushback rod 41, the second sleeve 48 is connected with the communication pipe 211 on the fixed plate 21 away from the other end of the pushback rod 41, the second sleeve 48 is equipped with push spring 42, the second sleeve 48 is filled with oil, the pushback plate 43 is connected with the other end of the pushback rod 41 through the second connecting plate 44. The pushback plate 43 is away from the box 10 on one side is equipped with a second clamping groove 431 corresponding to the first clamping groove 351. When the anti-collision ring 33 is hit by external objects, the buffer spring 32 of the buffer mechanism 30 is extruded, the hydraulic oil in the communication pipe 211 is extruded to the second sleeve 48, the push spring 42 pushes the pushback rod 41 under the pressure of the hydraulic oil, and then drives the pushback plate 43 to move to the cross bar 35, the first clamping groove 351 and the second clamping groove 431 are clamped, and then the impact force of the external object on the box 10 is converted into the thrust on the buffer mechanism 30.

[0035] It should be noted that the buffer rod 31, the buffer spring 32 and the pushback rod 41, the push spring 42 are alternately arranged above and below the upper and lower surfaces of the box 10 but not in contact with the upper and lower surfaces, the anti-collision ring 33 and the pushback plate 43 are alternately arranged at the front surface of the box 10, not in contact with the front surface without being hit by external objects. The buffer mechanism 30 further comprises the outer coil plate 36 formed by extending outward from both ends of the cross bar 35 and then to both sides of the box 10, which can prevent the fixed mechanism 20 from being hit by external objects.

[0036] Further, please refer to Figure 1 and Figure 5The back pushing plate 43 is provided with first limiting blocks 432 at the upper and lower ends of one side of the box 10, for installing the fire-retarding mechanism 50, and the left and right sides of the back pushing plate 43 are connected with moving plates 45. Figure 7 The moving plate 45 is provided with a plurality of convex blocks 451 on the side close to the box 10, when the first clamping groove 351 and the second clamping groove 431 are clamped, the horizontal rod 35 presses the moving plate 45, the moving plate 45 moves relative to the back pushing plate 43 towards the box 10, the convex blocks 451 gradually approach the fire-retarding mechanism 50 in the process of the moving plate 45 moving, and the fire-retarding mechanism 50 is damaged to release the fire-retarding agent.

[0037] Further, please refer to Figure 6 and Figure 8 The left and right sides of the back pushing plate 43 close to one side of the box 10 are connected with first convex plates 46, the first convex plates 46 are provided with a plurality of through holes 461, the side of the moving plate 45 away from the box 10 close to the back pushing plate 43 is connected with a second convex plate 47, the second convex plate 47 is vertically provided with a plurality of limiting rods 471 corresponding to the through holes 461, the moving plate 45 is fixed on the two sides of the back pushing plate 43 by inserting the limiting rods 471 on the second convex plate 47 into the through holes 461 on the first convex plate 46, the top end of the limiting rod 471 is further provided with a second limiting block 472 for preventing the first convex plate 46 from sliding out of the limiting rod 471, and a return spring 473 is further provided between the second convex plate 47 and the first convex plate 46 around the limiting rod 471, when the first clamping groove 351 and the second clamping groove 431 are clamped, the moving plate 45 is pressed by the horizontal rod 35, the second convex plate 47 is driven to compress the return spring 473, and when the pressing force disappears, the return spring 473 drives the moving plate 45 to return to the original position under the reaction force.

[0038] Specifically, please refer to Figure 5 and Figure 9The fireproof mechanism 50 comprises a fireproof plate 51, both upper and lower ends of the fireproof plate 51 are provided with mounting ports 52, which are used in cooperation with the first limiting blocks 432 to mount the fireproof plate 51 on one side of the pushback plate 43 close to the box body 10, the area of the fireproof plate 51 is approximately equal to the sum of the areas of the pushback plate 43 and the moving plates 45 on both sides of the pushback plate 43, the inside of the fireproof plate 51 is provided with a plurality of fireproof grooves 53, the inside of each fireproof groove 53 is filled with fireproof agent, the inner and outer surfaces of the fireproof groove 53 are provided with sealing membranes 54 for sealing the fireproof agent, when the first clamping groove 351 and the second clamping groove 431 are clamped, a plurality of protrusions 451 on the moving plate 45 extrude and break the sealing membrane 54 close to the moving plate 45 on the fireproof plate 51 during the movement towards the fireproof mechanism 50 and are inserted into the fireproof groove 53, so that the pressure in the fireproof groove 53 instantaneously rises, thereby extruding and breaking the sealing membrane 54 on the other side of the fireproof plate 51, so that the fireproof agent in the plurality of fireproof grooves 51 can be uniformly sprayed to the outside of the box body 10 under the action of pressure, in particular, the fireproof agent contains diatomite, which can absorb a small amount of leaked fuel, avoid the leaked fuel being ignited when the box body 10 is impacted, and improve the safety of use.

[0039] The mounting process of the fuel tank provided by the application is as follows: first, the fireproof mechanism 50 is mounted on the pushback mechanism 40, then the buffer mechanism 30 and the pushback mechanism 40 are welded to the fixed plate 21, subsequently, the fixed plate 21 is aligned with the outside of the vehicle and is fixed through the I-shaped frame 22 and the bolts 23, then the box body 10 is inserted into the space formed by the fixed plate 21, the buffer mechanism 30 and the pushback mechanism 40, and the left and right sides of the box body 10 are limited and fixed through the welding between the fixed frame 24, the side plate 241 and the support frame 242. After the impact ends, the fireproof plate 51 needs to be replaced, first, the damaged fireproof plate 51 is disassembled, the new fireproof plate 51 is inserted on the first limiting block 432 through the mounting port 52, and the fireproof plate 51 is fixed and limited through the first limiting block 432, thereby completing the replacement of the fireproof plate 51.

[0040] From the above description, it can be known that the fuel tank provided by the application can effectively reduce the impact of external objects on the fuel tank, improve the service life of the fuel tank, and effectively solve the problem of easy damage of the fuel tank, by the buffer mechanism and the back-pushing mechanism, if an external object hits the fuel tank when the vehicle is running, the buffer mechanism is hit first, the buffer mechanism transmits the impact force generated by the impact to the back-pushing mechanism, and then converts it into the pushing force of the back-pushing mechanism on the buffer mechanism, thereby converting part of the impact force of the object on the fuel tank into the impact on the object itself, which can effectively reduce the impact of external objects on the fuel tank, improve the service life of the fuel tank, and effectively solve the problem of easy damage of the fuel tank; in addition, by the back-pushing mechanism and the fire-retardant mechanism, after the back-pushing mechanism and the buffer mechanism are engaged, the protrusions on the moving plate extrude and damage the sealing film on the fire-retardant plate, so that the fire-retardant agent in the fire-retardant groove can be injected outside the fuel tank under the action of pressure, and the plurality of fire-retardant grooves opened around the outside of the fuel tank can make the fire-retardant agent evenly sprayed on the outer wall of the fuel tank, thereby effectively reducing the probability of ignition of the fuel tank due to impact, effectively solving the problem of secondary damage caused by leaked fuel, and improving the safety in use.

[0041] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A fuel tank, characterized in that, The utility model relates to a kind of vehicle box, including: Box (10); Fixing mechanism (20) is connected with the box (10), for the box (10) is fixed on vehicle body; Buffer mechanism (30) is connected with the fixing mechanism (20), is installed on the outside of the box (10), part of the buffer mechanism (30) when the box (10) is impacted by external object moves towards the direction close to the fixing mechanism (20); Pushback mechanism (40) is connected with the fixing mechanism (20), part of the pushback mechanism (40) when part of the buffer mechanism (30) moves towards the fixing mechanism (20) moves away from the direction of the fixing mechanism (20); The buffer mechanism (30) includes multiple sets of buffer rods (31) on the upper and lower surfaces of the box (10), a first sleeve (38) is sealingly connected with one end of the buffer rod (31), a crash ring (33) is connected with the other end of the buffer rod (31), the crash ring (33) is contacted with external object when the box (10) is impacted by external object, the buffer rod (31) moves towards the direction close to the fixing mechanism (20) under the push of the crash ring (33);The pushback mechanism (40) includes multiple sets of pushback rods (41), a second sleeve (48) is sealingly connected with one end of the pushback rod (41), a pushback plate (43) is connected with the other end of the pushback rod (41), the inside of the second sleeve (48) is connected with the inside of the first sleeve (38) by oil, when the buffer rod (31) moves towards the direction close to the fixing mechanism (20), the oil in the first sleeve (38) and the second sleeve (48) pushes the pushback rod (41) to move away from the direction of the fixing mechanism (20), drives the pushback plate (43) to move towards the direction of external object.

2. The fuel tank of claim 1, wherein The fixing mechanism (20) includes a fixing plate (21) connected with the rear surface of the box (10), the inside of the fixing plate (21) is higher than the upper surface of the box (10) and lower than the lower surface of the box (10), and two parallel communication pipes (211) are provided at the positions, the communication pipes (211) are filled with oil, one end of the first sleeve (38) and the second sleeve (48) away from the buffer rod (31) and the pushback rod (41) is alternately connected with the communication pipes (211), the first sleeve (38) and the second sleeve (48) are respectively provided with buffer springs (32) and push springs (42), after the crash ring (33) is impacted by external object, the buffer rod (31) compresses the buffer spring (32) towards the direction close to the fixing plate (21), the oil in the communication pipes (211) is pressed to the inside of the second sleeve (48), and the pushback rod (41) is pushed to move away from the direction of the fixing plate (21).

3. The fuel tank of claim 1, wherein The side of the back-pushing plate (43) is connected with a moving plate (45), the left and right sides of the back-pushing plate (43) close to one side of the box (10) are connected with first convex plates (46), a plurality of through holes (461) are arranged on the first convex plates (46), the side of the moving plate (45) away from the box (10) is connected with a second convex plate (47) close to one side of the back-pushing plate (43), a plurality of limiting rods (471) corresponding to the through holes (461) are vertically arranged on the second convex plate (47), the top end of the limiting rod (471) is further provided with a second limiting block (472), a back-pulling spring (473) is further arranged between the second convex plate (47) and the first convex plate (46) around the limiting rod (471), and the moving plate (45) is fixed to the two sides of the back-pushing plate (43) through cooperation of the through holes (461) and the limiting rods (471).

4. The fuel tank of claim 3, wherein The buffer mechanism (30) further comprises a cross rod (35), the cross rod (35) connects a plurality of the anti-collision rings (33) together in the transverse direction, the side of the cross rod (35) facing the back-pushing plate (43) is provided with a first clamping groove (351), the back-pushing plate (43) is provided with a second clamping groove (431) corresponding to the first clamping groove (351), in the moving process of the back-pushing plate (43), the second clamping groove (431) on the back-pushing plate (43) is clamped with the first clamping groove (351) arranged on the cross rod (35), and when the second clamping groove (431) is clamped with the first clamping groove (351), the moving plate (45) moves relative to the back-pushing plate (43) in the direction close to the box (10).

5. The fuel tank of claim 4, wherein A plurality of convex blocks (451) are arranged on the side of the moving plate (45) close to the box (10), the back-pushing plate (43) and the moving plate (45) are provided with a fire-retardant plate (51) on the side close to the box (10), a plurality of fire-retardant grooves (53) are arranged in the fire-retardant plate (51), the fire-retardant grooves (53) are filled with fire-retardant agents, the outer surface of the fire-retardant agents is provided with a sealing film (54), when the moving plate (45) moves relative to the back-pushing plate (43), the convex blocks (451) on the moving plate (45) can damage the sealing film (54), so that the fire-retardant grooves (53) release the fire-retardant agents.

6. The fuel tank of claim 5, wherein First limiting blocks (432) are arranged at the upper and lower ends of the side of the back-pushing plate (43) close to the box (10), mounting openings (52) are arranged at the upper and lower ends of the fire-retardant plate (51) and cooperate with the first limiting blocks (432) to mount the fire-retardant plate (51) on the side of the back-pushing plate (43) close to the box (10).

7. The fuel tank of claim 2, wherein The fixing mechanism (20) further comprises side plates (241) on the upper and lower sides of the box body (10) and protruding out of the left and right edges of the box body (10), support frames (242) are connected between the two side plates (241) on the left upper and lower sides of the box body (10) and between the two side plates (241) on the right upper and lower sides of the box body (10), and the box body (10) is located between the support frames (242).

8. The fuel tank of claim 2, wherein A I-shaped frame (22) is installed on the side of the fixing plate (21) away from the box body (10), and the I-shaped frame (22) is connected with the vehicle body through bolts (23).

9. The fuel tank of claim 1 wherein, A buffer ball pad (37) is arranged on the side of the anti-collision ring (33) close to the box body (10), a plurality of buffer grooves (11) are arranged at the upper and lower ends of the front surface of the box body (10), soft rubber pads (12) matched with the buffer ball pad (37) are attached to the outer walls of the buffer grooves (11), and a plurality of combined ball rods (13) are further arranged in the buffer grooves (11) and form a cross-shaped net structure.

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