Foldable undercarriage fire extinguishing device

Abstract

The utility model discloses a foldable car bottom fire extinguishing device belongs to fire extinguishing technical field, solved the existing technology car bottom fire extinguishing device fire extinguishing mode fixed, inconvenient storage, complex operation and low fire extinguishing efficiency's problem. The device includes car body system, liquid inlet and liquid outlet system, propulsion system and rotating system. Car body system is equipped with foldable handlebar and universal wheel, and it is convenient to remove and store, and liquid inlet and liquid outlet system are connected through the bellow multiple fire extinguishing pipeline, realizes the delivery of fire extinguishing agent, and propulsion system adopts labor -saving lever structure, and the operation is simple, and rotating system is through the gear and the rack cooperation, drives fire extinguishing pipeline to unfold or to gather, forms the " rice " character shape cover. The maximum coverage range can be 200cm after the device unfolding 135cm, and the minimum coverage range can be 35cm after gathering 85cm. The utility model can switch the coverage fire extinguishing and the centralized fire extinguishing mode flexibly, improves new energy automobile chassis fire's fire extinguishing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fire extinguishing technology, and in particular to a foldable vehicle undercarriage fire extinguishing device, which is suitable for rapid extinguishing of fires on the chassis of new energy vehicles. Background Technology

[0002] The rapid development of new energy vehicles has made the safety of power batteries increasingly prominent. Unlike traditional fuel vehicles, the power battery packs of new energy vehicles are usually laid flat in the middle of the vehicle chassis, making them prone to rapid combustion, high temperatures, and easy reignition in fires. However, traditional fire extinguishing devices have significant shortcomings in dealing with such fires. Because the extinguishing agent can only be sprayed from the side or top of the vehicle, it is difficult to penetrate structural barriers such as chassis guard plates and anti-collision beams, resulting in low fire extinguishing efficiency. Experimental data shows that when using side spraying, less than 30% of the extinguishing agent can reach the battery compartment, with the majority being dispersed by the chassis's airflow structure, failing to effectively control the fire.

[0003] To address this issue, some dedicated fire extinguishing devices for under-vehicle areas have emerged in existing technologies, but these devices still have many limitations. Existing devices typically only provide a fixed-angle, covering spray, unable to dynamically adjust the spray range according to the fire's intensity, resulting in wasted extinguishing agents. Furthermore, these devices are bulky when deployed, inconvenient to store, and hinder rapid deployment and storage. In addition, complex operation and reliance on external power sources limit their practicality in emergency scenarios. These shortcomings mainly stem from the fact that existing devices fail to balance fire extinguishing efficiency and portability, lacking folding mechanisms and labor-saving operation designs. Therefore, there is an urgent need for a fire extinguishing device that can efficiently extinguish fires under vehicles and can be quickly folded and stored to meet actual rescue needs. Utility Model Content

[0004] Based on the above analysis, the present invention aims to provide a foldable vehicle under-vehicle fire extinguishing device to solve the problems of limited spray range, inconvenience in carrying and storing, and low efficiency in the delivery of fire extinguishing agents of traditional equipment.

[0005] The objective of this utility model is mainly achieved through the following technical solutions:

[0006] A foldable under-vehicle fire extinguishing device includes a vehicle body system, a liquid inlet and outlet system, a propulsion system, and a rotation system; the propulsion system includes a lever-saving rod, a lever-resistance rod, a rack-push rod, and a fulcrum shaft; the lever-saving rod is connected to the lever-resistance rod via the fulcrum shaft, and the lever-saving rod and the lever-resistance rod rotate synchronously;

[0007] The rotating system includes a limiting pin, a rack, and a gear; the rack meshes with the gear, and the gear is connected to the corresponding fire extinguishing pipeline of the liquid inlet and liquid outlet system through the limiting pin and the rack, so as to realize the synchronous deployment and retraction of the fire extinguishing pipeline.

[0008] Furthermore, the lever-saving rod is a telescopic structure.

[0009] Furthermore, the propulsion system includes a push rod shaft; the lever resistance rod is connected to the rack push rod via the push rod shaft.

[0010] Furthermore, the gears of the rotating system include: a first gear, a second gear, a third gear, a fourth gear, a fifth gear, and a sixth gear.

[0011] Furthermore, the first gear is connected to the first fire extinguishing pipe; the second gear is connected to the second fire extinguishing pipe; the third gear is connected to the third fire extinguishing pipe; and the other side is symmetrical about the middle fire extinguishing pipe.

[0012] Furthermore, the liquid inlet and outlet system includes a liquid inlet, an L-shaped liquid inlet pipe, a fire extinguishing pipe, and a corrugated pipe. The fire extinguishing pipes are interconnected through the corrugated pipes, and a water outlet is provided above the fire extinguishing pipe for conveying and spraying fire extinguishing agents.

[0013] Furthermore, the maximum rotation angles of the first fire extinguishing pipe, the second fire extinguishing pipe, and the third fire extinguishing pipe are 45°, 90°, and 135°, respectively.

[0014] Furthermore, the vehicle body system includes handlebars, a platform, a pivot unit, and a vehicle body structural component mounting platform; the handlebars are connected to the vehicle body structural component mounting platform via the pivot unit, and the platform is used to support the liquid inlet and outlet system and the rotation system.

[0015] Furthermore, the rotating shaft unit includes a fixed rod, a fixed rod rotating nut, clamps on both sides of the fixed rod, a first limiting pin, and a second limiting pin; the fixed rod rotating nut connects the fixed rod to the vehicle body structural component mounting platform, the clamps on both sides of the fixed rod are provided on both sides of the fixed rod to limit the lateral displacement of the fixed rod, and the first limiting pin and the second limiting pin are respectively placed on both sides of the fixed rod to limit the longitudinal displacement of the fixed rod.

[0016] Furthermore, the pivot unit also includes a limiting pin fastening spring; the handlebar achieves the folding function through the pivot unit. When the limiting pin fastening spring is pulled, the second limiting pin moves to release the limiting of the fixing rod, and the handlebar can rotate around the fixing rod nut to achieve folding or unfolding.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] (1) The foldable vehicle under-car fire extinguishing device of this utility model, through the cooperation of the propulsion system and the rotation system, utilizes the lever-based force-saving structure and gear and rack transmission to realize the synchronous unfolding and retraction of the fire extinguishing pipeline. It is easy to operate and saves effort, and can quickly adjust the fire extinguishing range to adapt to different fire extinguishing needs.

[0019] (2) The fire extinguishing pipeline of this utility model is connected by a corrugated pipe, which can rotate flexibly and form a "rice" shaped coverage after unfolding. The maximum coverage area can reach 200cm×135cm, which significantly improves the effective arrival rate of fire extinguishing agents and is especially suitable for fighting fires on the chassis of new energy vehicles.

[0020] (3) The vehicle body system of this utility model adopts a foldable design, and the handlebars and fire extinguishing pipes can be folded up. The minimum coverage area after folding is 35cm×85cm, which is convenient for transportation and storage, and solves the problem of traditional fire extinguishing devices being bulky and inconvenient to store.

[0021] (4) The propulsion system of this utility model adopts a force-saving lever structure, combined with a retractable lever force-saving rod, which further reduces the difficulty of operation and makes the fire extinguishing device easier to use in emergency situations.

[0022] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0023] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0024] Figure 1 This is a schematic diagram of the fire extinguishing device in a specific embodiment;

[0025] Figure 2a This is a schematic diagram of the structure of the rotating shaft unit in a specific embodiment;

[0026] Figure 2b This is an enlarged schematic diagram of a portion of the rotating shaft unit in a specific embodiment;

[0027] Figure 3 This is a schematic diagram of the bottom structure of the fire extinguishing device in a specific embodiment;

[0028] Figure 4 This is a schematic diagram of the internal structure of the fire extinguishing device in a specific embodiment;

[0029] Figure 5 This is a front view of the internal structure of the fire extinguishing device in a specific embodiment.

[0030] Figure 6a This is a schematic diagram of the propulsion system in a specific embodiment;

[0031] Figure 6b This is an enlarged schematic diagram of a portion of the propulsion system in a specific embodiment;

[0032] Figure 7 This is a schematic diagram of the fire extinguishing device after it has been stored in a specific embodiment.

[0033] Figure 8 This is a schematic diagram of the rotation system in a specific embodiment;

[0034] Figure 9 This is a side view of the fire extinguishing device after the fire extinguishing pipeline is fully deployed, according to a specific embodiment.

[0035] Figure label:

[0036] 1-Body system; 11-Handlebars; 12-Body panel; 13-Spindle unit; 131-Fixing rod; 132-Fixing rod rotating nut; 133-Fixing rod side clamps; 134-First limiting pin; 135-Second limiting pin; 136-Limiting pin fastening spring; 14-Body structure mounting platform; 15-Fire extinguishing pipeline fixing assembly; 16-Wheel caster; 2-Liquid inlet and outlet system; 21-Liquid inlet; 22-L-shaped liquid inlet pipe; 23-Fire extinguishing pipeline; 231-First fire extinguishing pipeline; 232-Second fire extinguishing pipeline; 233-Third fire extinguishing pipeline; 234-Intermediate fire extinguishing pipe; 235-Fourth fire extinguishing pipe; 236-Fifth fire extinguishing pipe; 237-Sixth fire extinguishing pipe; 24-Corrugated pipe; 3-Propulsion system; 31-Lever-saving lever; 32-Lever-resistance lever; 33-Rack and pinion push rod; 34-Lever fulcrum; 35-Fulcrum pivot; 36-Push rod pivot; 4-Rotation system; 41-Limit pin; 42-Rack; 43-Gear; 431-First gear; 432-Second gear; 433-Third gear; 434-Fourth gear; 435-Fifth gear; 436-Sixth gear. Detailed Implementation

[0037] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0038] A specific embodiment of this utility model is as follows: Figure 1 As shown, a foldable vehicle-mounted fire extinguishing device is disclosed, comprising a vehicle body system 1, a liquid inlet and outlet system 2, a propulsion system 3, and a rotation system 4. The vehicle body system 1 provides support and mobility for the liquid inlet and outlet system 2 and the rotation system 4. The liquid inlet and outlet system 2 is used for the delivery and spraying of the fire extinguishing agent. The propulsion system 3 and the rotation system 4 control the deployment and retraction of the fire extinguishing pipes of the liquid inlet and outlet system 2, enabling flexible adjustment of the fire extinguishing range.

[0039] The vehicle body system 1 includes a handlebar 11, a platform 12, a pivot unit 13, and a vehicle body structural component mounting platform 14. The highest point of the handlebar 11 is 110-130cm (120cm is the optimal height), which facilitates the operator's pushing during operation. The platform 12 supports the liquid inlet and outlet system 2 and the rotation system 4. The handlebar 11 is connected to the vehicle body structural component mounting platform 14 via the pivot unit 13, and the vehicle body structural component mounting platform 14 is fixedly connected to the platform 12. The handlebar 11 can be unfolded or folded by rotating through the pivot unit 13.

[0040] like Figure 2a and Figure 2b As shown, the pivot unit 13 includes a fixed rod 131, a fixed rod rotating nut 132, two clamping pieces 133 on both sides of the fixed rod, a first limiting pin 134, a second limiting pin 135, and a limiting pin fastening spring 136. The fixed rod 131 is an extension rod below the handlebar 11; the fixed rod 131 is connected to the two clamping pieces 133 on both sides of the fixed rod through the fixed rod rotating nut 132. The two clamping pieces 133 on both sides of the fixed rod limit the left and right movement of the fixed rod 131, the first limiting pin 134 restricts the fixed rod 131 from moving forward, and the second limiting pin 135 restricts the fixed rod 131 from moving backward, thereby fixing the fixed rod 131. The left and right sides of the fixed rod 131 have the same structure. The second limiting pin 135 is connected to the rotating nut 132 of the fixing rod via a limiting pin fastening spring 136. Elliptical holes are provided on the clamping plates 133 on both sides of the fixing rod, allowing the second limiting pin 135 to move within these holes. Pulling the limiting pin fastening spring 136 causes the second limiting pin 135 to move diagonally downwards, releasing the limiting constraint on the rear of the handlebar fixing rod 131. The handlebar 11 can then rotate around the rotating nut 132 of the fixing rod, allowing the handlebar 11 to retract. Figure 7 As shown. Pull the limit pin fastening spring 136 again, and at the same time pull up the handlebar 11. Then release the limit pin fastening spring 136, and the second limit pin 135 will automatically reset, re-establishing the limit on the handlebar fixing rod 131, so that the handlebar 11 can open.

[0041] The liquid inlet and outlet system 2 includes a liquid inlet 21, an L-shaped liquid inlet pipe 22, a fire extinguishing pipe 23, and a corrugated pipe 24. The vehicle body system 1 also includes a fire extinguishing pipe fixing assembly 15 and casters 16, wherein the fire extinguishing pipe fixing assembly 15 can be a nut. Figure 3 and Figure 4 As shown, the vehicle platform 12 is connected to one end of the fire extinguishing pipe 23 via the fire extinguishing pipe fixing assembly 15. Casters 16 are installed at the end of the fire extinguishing pipe 23 and at both ends of the vehicle body structural component mounting platform 14. Figure 4As shown, an L-shaped liquid inlet pipe 22 is provided above the vehicle platform 12. The liquid inlet 21 is connected to the L-shaped liquid inlet pipe 22 and can also be connected to an external pipe to deliver fire extinguishing agent. The fire extinguishing pipe 23 has a cuboid structure at the end away from the handlebar 11 and a cylindrical structure at the end closer to the handlebar 11. The cylindrical structures are connected by a corrugated pipe 24, through which the fire extinguishing agent can be delivered into the fire extinguishing pipe 23. The fire extinguishing pipe 23 has dimensions of 80cm × 4cm × 3cm and an outlet with a diameter of 4-6mm at the top for spraying fire extinguishing agent.

[0042] The propulsion system 3 includes a lever-saving rod 31, a lever-resistance rod 32, a rack and pinion push rod 33, a lever fulcrum 34, a fulcrum pivot 35, and a push rod pivot 36. For example... Figure 5 , Figure 6a and Figure 6b As shown, the lever-saving rod 31 is a telescopic rod located above the lever fulcrum 34. When the telescopic rod is pulled to its highest point, its top height is 110cm, facilitating operation; when the telescopic rod is fully retracted, its top height is 40cm. Figure 7 As shown. The lever resistance rod 32 is located below the lever fulcrum 34 and is connected to the push rod shaft 36. The fulcrum shaft 35 passes through the lever fulcrum 34, connecting the lever-saving rod 31 and the lever resistance rod 32 as a whole, ensuring that the lever-saving rod 31 and the lever resistance rod 32 rotate synchronously around the fulcrum shaft 35. The rack push rod 33 can be a long support rod of 0.9-1.1m. The push rod shaft 36 is inserted into the hole at the rear end of the rack push rod 33, which can drive the rack push rod 33 to move forward or backward. The liquid inlet 21 has a forward liquid inlet and a reverse liquid inlet. When the operator pulls the lever-saving rod 31 backward, the lever resistance rod 32 moves forward, driving the push rod shaft 36 forward, which in turn drives the rack push rod 33 forward; similarly, pushing the lever-saving rod 31 forward can drive the rack push rod 33 backward.

[0043] The rotating system 4 includes a limiting pin 41, a rack 42, and gears 43. There are two or more gears 43; specifically, in this embodiment, there are a first gear 431, a second gear 432, a third gear 433, a fourth gear 434, a fifth gear 435, and a sixth gear 436. Figure 8As shown in the figure, the number of fire extinguishing pipes 23 is more than three. Specifically, in this embodiment, the fire extinguishing pipes 23 include an intermediate fire extinguishing pipe 234 and three groups of symmetric pipes with the intermediate fire extinguishing pipe 234 as the symmetry axis: the first fire extinguishing pipe 231 and the sixth fire extinguishing pipe 237 are symmetrically arranged, the second fire extinguishing pipe 232 and the fifth fire extinguishing pipe 236 are symmetrically arranged, and the third fire extinguishing pipe 233 and the fourth fire extinguishing pipe 235 are symmetrically arranged. The cylindrical structures at the ends of the fire extinguishing pipes 23 are respectively connected to the corresponding gears 43 through racks 42. There is no gear under the intermediate fire extinguishing pipe 234, and it is only fixed through the limit pins 41 and the fire extinguishing pipe fixing components 15.

[0044] Specifically, the first gear 431 on one side and the first fire extinguishing pipe 231 are fixed through the limit pin 41 and the fire extinguishing pipe fixing component 15. The rotation of the first gear 431 can drive the rotation of the first fire extinguishing pipe 231; similarly, the second gear 432 is fixed to the second fire extinguishing pipe 232, and the third gear 433 is fixed to the third fire extinguishing pipe 233. The diameter of the first gear 431 is 3 - 5 cm, the diameter of the second gear 432 is 1 - 3 cm, and the diameter of the third gear 433 is 1.1 - 1.5 cm. To avoid interference, the first gear 431 is located at the front end, and the corresponding first fire extinguishing pipe 231 and the intermediate fire extinguishing pipe 234 are flush front and back; the center of the second gear 432 has a first spacing distance relative to the center of the first gear 431, and the positional relationship between the corresponding first fire extinguishing pipe 231 and the second fire extinguishing pipe 232 is the same; the center of the third gear 433 has a second spacing distance from the center of the first gear 431, and the corresponding third fire extinguishing pipe 233 adopts the corresponding layout method, and the same applies to the other side; among them, the first spacing distance is less than the second spacing distance. The rack 42 meshes with the gear 43. When the rack 42 is pushed forward, the gear 43 drives the fire extinguishing pipe 23 to expand outward; when the rack 42 is pushed backward, the gear 43 drives the fire extinguishing pipe 23 to contract inward.

[0045] As Figure 9 shown in the figure, after the fire extinguishing pipes 23 are fully expanded, the fire extinguishing device is in a "rice" shape. The intermediate fire extinguishing pipe 234 remains stationary, and the first fire extinguishing pipe 231, the second fire extinguishing pipe 232, and the third fire extinguishing pipe 233 on one side can rotate 45°, 90°, and 135° respectively, and the rotation angles on the other side are symmetric. The corresponding rack 42 moves forward, the push rod 33 moves forward, and the end of the lever force-saving rod 31 moves forward. This distance can be easily completed by an adult's arm to pull the entire stroke of the lever.

[0046] Specifically, when the fire extinguishing device needs to be deployed, the lever force-saving rod 31 is pulled backward, and the fulcrum rotating shaft 35 drives the push rod rotating shaft 36 at the end of the lever resistance rod 32 to move forward. This action is transmitted to the rack 42 through the rack push rod 33, causing the rack 42 to move forward synchronously. The rack 42 meshes with the gear 43, driving the fire extinguishing pipeline 23 to deploy at a set angle. For example, the first gear 43 on one side drives the first fire extinguishing pipeline 231 to rotate 45°, the second gear 44 drives the second fire extinguishing pipeline 232 to rotate 90°, and the third gear 45 drives the third fire extinguishing pipeline 233 to rotate 135°, and the other side rotates and deploys symmetrically. At this time, all the fire extinguishing pipelines 23 are deployed in a "rice" shape, with a maximum coverage range of 200 cm × 135 cm. The middle fire extinguishing pipeline 234 remains fixed to ensure the stability of the central jet of the fire extinguishing agent.

[0047] Further, when the fire extinguishing device needs to be retracted, the force-saving rod 31 is pushed forward, the fulcrum rotating shaft 35 rotates in the reverse direction, and the push rod rotating shaft 36 at the end of the lever resistance rod 32 is driven to move backward. This action is transmitted to the rack 42 through the rack push rod 33, causing the rack 42 to move backward synchronously. The reverse meshing of the rack 42 and the gear 43 drives each fire extinguishing pipeline 23 to be gradually retracted. The first fire extinguishing pipeline 231 on one side rotates back to its original position from 45°, the second fire extinguishing pipeline 232 is retracted from 90°, and the third fire extinguishing pipeline 233 rotates back to its original position from 135°, and the other side rotates and retracts symmetrically. Finally, all the fire extinguishing pipelines 23 are retracted to a minimum coverage range of 35 cm × 85 cm, and the middle fire extinguishing pipeline 234 still remains fixed.

[0048] In this embodiment, after the fire extinguishing pipeline 23 is fully deployed through the rotating system 4, the maximum coverage range of the fire extinguishing device is 200 cm × 135 cm; after retraction, the minimum coverage range of the fire extinguishing device is 35 cm × 85 cm. By adjusting the propulsion system 3, the coverage range of the fire extinguishing device can be flexibly adjusted between the maximum and the minimum, which can not only achieve covering fire extinguishing but also centralized fire extinguishing, making the fire extinguishing work more flexible and efficient.

[0049] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A foldable vehicle under-car fire extinguishing device, characterized in that, It includes a vehicle body system (1), a liquid inlet and outlet system (2), a propulsion system (3), and a rotation system (4); the propulsion system (3) includes a lever-saving rod (31), a lever-resistance rod (32), a rack-push rod (33), and a fulcrum shaft (35); the lever-saving rod (31) is connected to the lever-resistance rod (32) through the fulcrum shaft (35), and the lever-saving rod (31) and the lever-resistance rod (32) rotate synchronously; The rotating system (4) includes a limiting pin (41), a rack (42) and a gear (43); the rack (42) meshes with the gear (43), and the gear (43) is connected to the fire extinguishing pipe (23) of the corresponding liquid inlet and liquid outlet system (2) through the limiting pin (41) and the rack (42) to realize the synchronous deployment and retraction of the fire extinguishing pipe (23).

2. The vehicle under-car fire extinguishing device according to claim 1, characterized in that, The lever (31) is a telescopic structure.

3. The vehicle under-car fire extinguishing device according to claim 1, characterized in that, The propulsion system (3) includes a push rod shaft (36); the lever resistance rod (32) is connected to the rack push rod (33) through the push rod shaft (36).

4. The vehicle under-car fire extinguishing device according to claim 1, characterized in that, The gears (43) of the rotating system (4) include: a first gear (431) and a fourth gear (434); a second gear (432) and a fifth gear (435); a third gear (433) and a sixth gear (436).

5. The undercarriage fire extinguishing device according to claim 4, characterized in that, The first gear (431) is connected to the first fire extinguishing pipe (231); the second gear (432) is connected to the second fire extinguishing pipe (232); the third gear (433) is connected to the third fire extinguishing pipe (233); the other side is symmetrical about the middle fire extinguishing pipe (234).

6. The vehicle under-car fire extinguishing device according to claim 1, characterized in that, The liquid inlet and outlet system (2) includes an inlet (21), an L-shaped inlet pipe (22), a fire extinguishing pipe (23) and a corrugated pipe (24). The fire extinguishing pipe (23) is interconnected through the corrugated pipe (24). The fire extinguishing pipe (23) is provided with an outlet at the top for conveying and spraying fire extinguishing agents.

7. The undercarriage fire extinguishing device according to claim 5, characterized in that, The maximum rotation angles of the first fire extinguishing pipe (231), the second fire extinguishing pipe (232), and the third fire extinguishing pipe (233) are 45°, 90°, and 135°, respectively.

8. The vehicle under-car fire extinguishing device according to claim 1, characterized in that, The vehicle body system (1) includes a handlebar (11), a platform (12), a pivot unit (13), and a vehicle body structural component mounting platform (14); the handlebar (11) is connected to the vehicle body structural component mounting platform (14) through the pivot unit (13), and the platform (12) is used to support the liquid discharge system (2) and the rotation system (4).

9. The vehicle under-car fire extinguishing device according to claim 8, characterized in that, The rotating shaft unit (13) includes a fixed rod (131), a fixed rod rotating nut (132), two clamps (133) on both sides of the fixed rod, a first limiting pin (134) and a second limiting pin (135); the fixed rod rotating nut (132) connects the fixed rod (131) to the vehicle body structural component mounting platform (14); the two clamps (133) on both sides of the fixed rod (131) are provided to limit the lateral displacement of the fixed rod (131); the first limiting pin (134) and the second limiting pin (135) are respectively placed on both sides of the fixed rod (131) to limit the longitudinal displacement of the fixed rod (131).

10. The vehicle under-car fire extinguishing device according to claim 9, characterized in that, The pivot unit (13) also includes a limiting pin fastening spring (136); the handlebar (11) realizes the folding function through the pivot unit (13). When the limiting pin fastening spring (136) is pulled, the second limiting pin (135) moves to release the limiting of the fixing rod (131), and the handlebar (11) can rotate around the fixing rod rotating nut (132) to realize folding or unfolding.

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