Fire extinguishing device for a mine truck

DE202024106761U1Active Publication Date: 2025-04-10HUANENG YIMIN COAL ELECTRICITY CO LTD
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Patent Information

Application Number
DE202024106761
Authority / Receiving Office
DE · DE
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2025-04-10
Estimated Expiration
2034-11-30

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Abstract

Fire extinguishing device for a mine truck, characterized in that it comprises the following: a fire extinguishing unit (100) comprising a mounting component (101) and a fire extinguishing component (102) arranged outside the mounting component (101); a flow dividing unit (200) comprising a flow dividing component (201) arranged on one side of the mounting component (101), a current-carrying component (202) arranged on one side of the flow dividing component (201) and a cleaning component (203) arranged on one side of the mounting component (101).
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Description

TECHNICAL FIELDThe present invention relates to the field of fire extinguishing in vehicles, and more particularly to a fire extinguishing apparatus for mine trucks.PRIOR ARTIn modern mining operations, the safety performance of the mine truck is of decisive importance as an important transport means. However, mine trucks are often subject to various fire hazards due to their particular operating environment, such as tank leakage, ground fire due to friction, tire overheating explosion, or electrical conduction failure. Mine trucks are generally equipped with fire-extinguishers as an emergency measure against these possible fire hazards, but at present, mine trucks are frequently installed in conspicuous locations in trucks, for example, via trucks, near the cab, or at locations easily and quickly accessible to the driver, according to the standardized design. The initial desire is that a driver in emergency situations can quickly pick up the fire extinguisher and extinguish the fire that is being used. However, the conventional method of installing fire extinguishers has some visual limitations, on the one hand, the capacity of the conventional fire extinguisher is relatively low, which may not meet the need for extinguishing large mine trucks in the event of a severe fire. When the fire is large or the fire origin is not easily approached, it is difficult for the low capacity fire extinguisher to efficiently control the fire in a short time, which requires the driver to dough and dough a plurality of times to extinguish the fire, thereby not only increasing the difficulty of extinguishing but also increasing the extinguishing time; On the other hand, the driver must leave the cab to increase a fire extinguisher when the tank, the floor, the tire or the conduit of the mine truck, etc. burns, which is not only inefficient but also presents a high safety risk, and particularly at the workstations with complicated terrains and difficult environments, such as in the mines, the driver very easily suffers a high-camber accident, such as slipping and dropping, during boarding and disembarking, leading to personnel damage; moreover, the mine trucks normally have a high height, therefore a driver with tools or climbing must take the fire extinguisher installed above the truck, which is not only the operational complexity but also the operating complexity.CONTENT OF THE PRESENT INVENTIONIn view of the above-described problems in the related art, the present invention is provided.The object of the present invention is therefore to provide a fire extinguishing apparatus for a mine truck which can solve the problems that the currently used fire extinguisher for a mine truck has a small capacity, is not easy to take, and has a relatively low fire extinguishing efficiency.In order to solve the above technical problems, the present invention provides the following technical solutions, namely, a fire extinguishing device for a mine truck, comprising the following, a extinguishing unit comprising a fastening component and a extinguishing component disposed outside the fastening component;A flow splitting unit comprising a flow splitting component disposed on a side of the attachment component, a current carrying component disposed on a side of the flow splitting component, and a cleaning component disposed on a side of the attachment component.As a preferred solution of the fire extinguishing device according to the invention for a mine truck, the fastening component comprises a fastening bracket, a fastening disc arranged on the upper side of the fastening bracket and a rotary roller which is rotatably connected to the fastening disc.As a preferred solution of the fire extinguishing device according to the invention for a mine truck, the extinguishing component comprises a fire extinguisher arranged on one side of the fastening holder, a pipe of the fire extinguisher firmly connected to the fire extinguisher and an elongated fire extinguishing pipe arranged outside the rotary roller.As a preferred solution of the fire extinguishing apparatus for a mine truck according to the present invention, the flow dividing component comprises a mounting box fixedly connected to the mounting component, a flow dividing pipe disposed on one side of the mounting box, a flow dividing member disposed within the mounting box, a flow dividing passage disposed within the mounting component, and a connecting passage disposed in a step of the flow dividing passage;The flow dividing member includes two sets of rotating plates disposed inside the mounting box, a push rod disposed outside the rotating plates, and a first return spring fixedly connected to the push rod.As a preferred solution of the fire extinguishing device according to the invention for a mine truck, the current-carrying component comprises a cam arranged on the top side of the push rod, a first electrode strip firmly connected to the cam, a movable rod arranged on the top side of the cam, a second restoring spring arranged on one side of the movable rod and a second electrode strip arranged on one side of the movable rod.As a preferred solution of the fire extinguishing device according to the invention for a mine truck, the cleaning component comprises a cleaning pipe arranged on one side of the mounting box, two sets of stops arranged inside the mounting box, a folding plate arranged on the top side of the stops, a locking catch arranged inside the folding plate and a compression spring firmly connected to the inside of the stops.As a preferred solution of the fire extinguishing apparatus for mine truck according to the present invention, the fixing bracket is fixed at a position where the original fire extinguisher of mine truck is disposed, the pipe of fire extinguisher is attached to the bottom of the fixing box, and the other end of the pipe of fire extinguisher is fixedly connected to the changed fire extinguisher of large capacity.As a preferred solution of the fire extinguishing apparatus for mine truck according to the present invention, one end of the cleaning pipe is connected to the upper side of the mounting box and the other end is connected to a blower opening of the blower, the circuit of the blower is connected to the inner side of the movable rod and is turned on or off by contact or non-contact with the first electrode strip and the second electrode strip.As a preferred solution of the fire extinguishing apparatus for mine truck according to the present invention, the elongated fire extinguishing pipe is wound around the surface of the rotary roller, the flow dividing passage is disposed inside the rotary roller, one end of which is connected to the mounting box through the center of the rotary roller, and the other end of which is connected to the connecting passage and is connected to one end of the elongated fire extinguishing pipe through the connecting passage.As a preferred solution of the fire extinguishing apparatus for a mine truck according to the invention, the pipe of the fire extinguisher is sheathed with the elongated fire extinguishing pipe and attached thereto, and after completion of the fire extinguishing material in the fire extinguisher, disassembly and separation can be carried out and the pipe of the fire extinguisher and the fire extinguisher are changed.The present invention has the following advantageous effects: an elongated fire hose in the present invention increases the range of application of the fire extinguisher, whereby workers can extinguish the fire in mine trucks without frequently moving the heavy fire extinguisher and at the same time increases the capacity of the fire extinguisher, and the likelihood that the fire extinguishing material is insufficient during fire extinguishing is reduced, whereby the cooperation of the flapper plate and the pushing plate prevents the fire extinguishing material from clogging the elongated fire hose and the fire extinguishing material from getting into the cleaning pipe or fire hose under the action of the air flow, damaging the respective machines.BRIEF DESCRIPTION OF THE DRAWINGSIn order to better illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, it being understood that the drawings in the following description represent only some embodiments of the present invention, and that other drawings may be obtained from these drawings by those skilled in the art without inventive intervention. Shown therein are: FIG. 1 is a schematic structural view of the fire extinguisher of the fire extinguishing apparatus for a mine truck. FIG. 2 is a schematic structural view of the flow dividing unit and a part of the extinguishing unit of the fire extinguishing apparatus for a mine truck. FIG. 3 is a schematic structural view of a part of the attachment component of the fire extinguishing apparatus for a mine truck. FIG. 4 is a schematic sectional view of the structure of the flow dividing component of the fire extinguishing apparatus for mine truck. FIG. 5 is a schematic sectional view of the internal structure of the attachment box of the fire extinguishing apparatus for a mine truck. FIG. 6 is a schematic structural view of the portion A shown in FIG. 5. FIG. 7 is a schematic structural view of the portion B shown in FIG. 5.DETAILED DESCRIPTIONIn order to make the above objects, features and advantages of the present invention more fully understood, the embodiments of the present invention will be described below with reference to the accompanying drawings.In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and a person skilled in the art may similarly apply the present invention without departing from the spirit of the present invention, so that the present invention is not limited to the concrete embodiments disclosed below.Further, the terms "an embodiment" or "embodiments" mean a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The occurrence of "in one embodiment" at various places in the specification does not always refer to the same embodiment, nor to the embodiment that repels other embodiments separately or alternatively.Embodiment 1FIGS. 1 to 7 illustrate the first embodiment of the present invention, in which a fire extinguishing apparatus for a mine truck is provided in which the fire extinguisher 102 awith a larger capacity cooperates with a long pipe, whereby workers can quickly pull the pipe to the site of fire and extinguish the fire without frequently taking the fire extinguisher 102 a, thereby extremely improving the fire extinguishing efficiency.In particular, the extinguishing unit 100 comprises a fastening component 101 and an extinguishing component 102 arranged outside the fastening component 101;A flow dividing unit 200 includes a flow dividing component 201 disposed on a side of the fixing component 101, a current carrying component 202 disposed on a side of the flow dividing component 201, and a cleaning component 203 disposed on a side of the fixing component 101.Further, the fastening component 101 includes a fastening bracket 101 a, a fastening disk 101 bdisposed on the upper side of the fastening bracket 101 a, and a rotation roller 101 crotatably connected to the fastening disk 101 b, wherein the fastening bracket 101 ais fixedly connected to the fastening disk 101 band the rotation roller 101 cis hollow.Further, the extinguishing component 102 comprises a fire extinguisher 102a disposed on one side of the mounting bracket 101a, a pipe of the fire extinguisher 102a fixedly connected to the fire extinguisher 102a, and an elongated fire hose pipe 102c disposed outside the rotary roller 101c, wherein the elongated fire hose pipe 102c is wound around the outside of the rotary roller 101c, and in use, the rotary roller 101c can be driven to rotate by pulling the elongated fire hose pipe 102c.Further, the flow dividing component 201 includes a fixing box 201 afixedly connected to the fixing component 101, a flow dividing pipe 201 bdisposed on a side of the fixing box 201 a, a flow dividing member 201 cdisposed inside the fixing box 201 a, a flow dividing passage 201 ddisposed inside the fixing component 101, and a connecting passage 201 edisposed in a stage of the flow dividing passage 201 d, wherein the flow dividing pipe 201 bis fixedly connected to the fixing box 201 aand is simultaneously fixed to the pipe of the fire extinguisher 102 a;The flow dividing member 201 cincludes two sets of rotating plates 201 c- 1 disposed inside the fixing box 201 a, a push rod 201 c- 2 disposed outside the rotating plates 201 c- 1, and a first return spring 201 c- 3 fixedly connected to the push rod 201 c- 2, the rotating plates 201 c- 1 being hinged to the fixing box 201 a, the push rods 201 c- 2 being in contact with the rotating plates 201 c- 1, the first return spring 201 c- 3 being disposed at the lower end of the push rods 201 c- 2, and the push rods 201 c- 2 being moved outward and simultaneously driving the first return spring 201 c- 3 to be compressed when the rotating plates 201 c- 1 are rotated outward.Further, the current-carrying component 202 includes a cam 202 aarranged on the upper side of the push rod 201 c- 2, a first electrode strip 202 bfixedly connected to the cam 202 a, a movable rod 202 carranged on the upper side of the cam 202 a, a second return spring 202 darranged on a side of the movable rod 202 c, and a second electrode strip 202 earranged on a side of the movable rod 202 c, wherein the cam 202 ais fixedly connected to the push rod 201 c- 2, the bottom of the movable rod 202 cis contacted with the tip of the cam 202 a, and the second electrode strip 202 eis fixedly connected to the movable rod 202 c.Further, the cleaning component 203 includes a cleaning pipe 203 adisposed on a side of the mounting box 201 a, two sets of stoppers 203 bdisposed inside the mounting box 201 a, a folding plate 203 cdisposed on the top of the stoppers, a locking catch 203 ddisposed inside the folding plate 203 c, and a compression spring 203 efixedly connected to the inside of the stoppers, wherein the cleaning pipe 203 ais fixedly connected to the mounting box 201 a, the stoppers are slidably connected to the mounting box 201 a, and an end on the outside comes into contact with the tip of the movable rod 202 c, the folding plate 203 cis hinged to the mounting box 201 a, the tip of the stoppers is provided with racks, and the locking catch 203 dis engaged with the racks disposed at the tip of the stoppers.Note that the lock pawl 203 dis hinged to the mounting box 201 avia an axis, the axis being provided with one end of the threads on one side and the corresponding inside of the folding plate 203 cis provided with thread grooves, and since the folding plate 203 cis limited by the lock pawl 203 d, a segment of the thread can be rotated into the inside of the folding plate 203 cduring the rotation of the axis, and the end of the axis is provided with a tension spring and a groove at the outer end that fits into the aperture of the movement hole on the outside of the mounting box 201 a, and when the folding plate 203 cis to be unlocked, the worker pulls the axis to put the tension spring in a tensioned state, the groove is aligned with the moving hole, the latch is driven by the axle to move up and leave the racks over the stops, and after the flip plate 203 cis unlocked, the worker releases the outer end of the axle, the tension spring returns to an initial position, and the axle engages the moving hole.Preferably, the fixing bracket 101a is fixed at a position where the original fire extinguisher 102a of the mine truck is disposed, the pipe of the fire extinguisher 102a is attached to the bottom of the fixing box 201a, and the other end of the pipe of the fire extinguisher 102a is fixedly connected to the changed large capacity fire extinguisher 102a; one end of the cleaning pipe 203a is connected to the upper side of the fixing box 201a and the other end is connected to a blower port of the blower, the circuit of the blower is connected to the inside of the movable rod 202c and turned on or off by contact or non-contact with the first electrode strip 202b and the second electrode strip 202e; The elongated fire extinguishing pipe 102 cis wound around the surface of the rotary roller 101 c, the flow dividing passage 201 dis disposed inside the rotary roller 101 c, one end of which is connected to the fixing box 201 athrough the center of the rotary roller 101 c, and the other end of which is connected to the communication passage 201 eand is connected to one end of the elongated fire extinguishing pipe 102 cthrough the communication passage 201 e; the pipe of the fire extinguisher 102 ais sheathed with and fixed to the elongated fire extinguishing pipe 102 c, and after completion of the fire extinguishing material in the fire extinguisher 102 a, mining and separation can be performed, and the pipe of the fire extinguisher 102 aand the fire extinguisher 102 aare changed.In use, when a fire occurs, the workers pull the elongated fire extinguishing pipe 102c to extend it to the site of fire, and further the workers open the valve of the large fire extinguisher 102a, the fire extinguishing material in the fire extinguisher 102a flows into the flow dividing pipe 201b through the pipe of the fire extinguisher 102a, the two rotary plates 201c-1 are repelled upward by the pushing force generated by the quick flow of the fire extinguishing material, so that the fire extinguishing material enters the flow dividing passage 201d through the pipe of the fire extinguisher 102a, then enters the elongated fire extinguishing pipe 102c through the communication passage 201e from the flow dividing passage 201d, and ejects it from this elongated fire extinguishing pipe 102c to perform the fire extinguishing operation at the lighting position, Therefore, only the workers in the fire extinguishing operation need to pull the elongated fire hose 102 cto move it without frequently taking up and moving the entire fire extinguisher 102 aup and down, thereby significantly improving fire extinguishing efficiency and safety. When the two rotary plates 201 c- 1 are pneumatically raised, the rotary plates 201 c- 1 are simultaneously rotated outward with the rotation axis of the lower side as the shaft, and the two side push rods 201 c- 2 are simultaneously pushed outward, the first return spring 201 c- 3 is compressed, the cam 202 acomes outward in synchronization with the push rod 201 c- 2, and at this time, the cam 202 aseparates from the bottom of the movable rod 202 c, the pressing force of the second return spring 202 dis disappeared, and since its upper end is fixed, the second return spring 202 dis stretched by a free length when the pressing force disappears, and since the other end of the second return spring 202 dis firmly connected to the movable rod 202 c, the movable rod 202 cis driven to move downward in synchronization, When the other end of the second return spring 202d moves downward so that the bottom of the movable rod 202c directly contacts the push rod 201c-2 after being separated from the cam 202a, and the tip of the movable rod 202c separates from the stoppers, the pressing force of the stoppers disappears, the pressing force of the compression spring 203e disappears synchronously, the compression spring 203e stretches outward by a free length, drives the stoppers to move outward, and when the stoppers move outward, the ratchet 203d is driven to rotate synchronously so that the shaft thread portion of the ratchet 203d is tightly screwed to the folder 203c, and at this time, the folder 203c is firmly connected to the ratchet 203d, In this case, the folding plate 203c is locked and cannot be pushed away by the impact force of the fire extinguishing material, thereby preventing the fire extinguishing material from entering the cleaning pipe 203a. When the fire extinguishing operation is completed and the fire extinguishing material is ejected totally, the workers gradually close the valve of the large fire extinguisher 102 a, and at this time, the pushing force, which is brought from the fire extinguishing material in the attachment box 201 a, is decreased, the pushing force on the first return spring 201 c- 3 simultaneously decreases, so that the first return spring 201 c- 3 gradually returns to the free length and drives the push rod 201 c- 2 to move inward, then the push rod 201 c- 2 drives the two rotating plates 201 c- 1 to rotate the rotation axis inward until they are completed to return the two rotating plates 201 c- 1 to the initial position, and when the two rotating plates 201 c- 1 return to the initial position, the movable rod 202 cis driven to contact the stopper again, At this time, the workers pull out the axle sleeve, the axle of the lock lever 203 dis pulled further upward to separate the lock lever 203 dfrom the stopper and unlock the folding plate 203 c, and at the same time, the cam 202 acommitates inward in synchronization with the push rod 201 c- 2 to abut on a bottom side of the movable rod 202 c, whereby the first electrode strip 202 bis brought into contact with the second electrode strip 202 e, and at this time, the blower circuit is turned on and starts blowing air into the mounting box 201 athrough the cleaning pipe 203 a, the high pressure gas blown by the blower blows the folding plate 203 ctoward the opened state inward, At this time, the high pressure gas flows into the flow dividing passage 201 dthrough the flow dividing pipe, then is discharged from the elongated fire hose pipe 102 cthrough the communication passage 201 e, and by this operation, the fire extinguishing material remaining in the flow dividing passage 201 dand the elongated fire hose pipe 102 cmay be blown out, and clogging of the elongated fire hose pipe 102 cchannel from the remaining fire extinguishing material may be prevented.In summary, an elongated fire hose in the present invention increases the range of application of the fire extinguisher, whereby workers can extinguish the fire in mine trucks without frequently moving the heavy fire extinguisher and at the same time increases the capacity of the fire extinguisher and reduces the possibility that the fire extinguishing material is insufficient during fire extinguishing, and the cooperation of the flapper and the push plate prevents the fire extinguishing material from clogging the elongated fire hose and the fire extinguishing material from getting into the cleaning pipe or the fire extinguishing pipe under the action of the air flow, damaging the respective machines. It is important to note that the construction and arrangement of the present invention shown in the various exemplary embodiments are exemplary only. Although only some embodiments have been described in detail in this disclosure, those skilled in the art who read this disclosure are intended to readily understand that many modifications are possible (e.g., size, dimensions, structures, shapes and proportions, values of parameters (e.g., temperature, pressure, etc.), arrangement, use of materials, colors, changes in orientations of the various elements, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally molded may be constructed from multiple parts or elements, the position of the elements may be reversed or otherwise altered, and the nature or number or position of the discrete elements may be modified or altered. Accordingly, all such modifications are intended to be included within the scope of the present invention. Any procedure or order of any acts or method steps may be changed or rearranged according to alternative embodiments. Any article "arrangement plus function" in the claims is intended to cover the structures described in the present invention that perform the functions described herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications still falling within the scope of the appended claims.In addition, to provide a predictive description of exemplary embodiments, not all features of the actual embodiments (i.e., those not relevant to the presently considered embodiment of the best mode of the present invention or not relevant to the practice of the present invention) may be described. It should be appreciated that in developing any actual embodiment, such as any project or design program, numerous decisions may be made regarding the specific embodiments. Such development effort may be complex and time consuming, but one skilled in the art having benefit of this disclosure is a routine task in design, fabrication, and fabrication that does not require undue experimentation.It should be noted that the above embodiments are only for explaining the technical solutions of the present invention and should not be taken as limiting, and that although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art are intended to understand that all modifications and equivalent substitutions of the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention are intended to fall within the claims of the present invention.

Claims

A fire extinguishing device for a mine truck, characterized by comprising: a extinguishing unit (100) comprising a fastening component (101) and an extinguishing component (102) disposed outside the fastening component (101); a flow dividing unit (200) comprising a flow dividing component (201) disposed on a side of the fastening component (101), a current carrying component (202) disposed on a side of the flow dividing component (201), and a cleaning component (203) disposed on a side of the fastening component (101).The fire extinguishing device for mine truck according to claim 1, characterized in that the fastening component (101) comprises a fastening bracket (101a), a fastening disk (101b) disposed on the top of the fastening bracket (101a), and a rotation roller (101c) rotatably connected to the fastening disk (101b).The fire extinguishing device for a mine truck according to claim 2, characterized in that the extinguishing component (102) comprises a fire extinguisher (102a) disposed on one side of the mounting bracket (101a), a pipe of the fire extinguisher (102a) fixedly connected to the fire extinguisher (102a), and an elongated fire extinguishing pipe (102c) disposed outside the rotary roller (101c).The fire extinguishing device for a mine truck according to any one of claims 1 to 3, characterized in that the flow dividing component (201) comprises a fixing box (201a) fixedly connected to the fixing component (101), a flow dividing pipe (201b) disposed on one side of the fixing box (201a), a flow dividing member (201c) disposed inside the fixing box (201a), a flow dividing passage (201d) disposed inside the fixing component (101), and a connecting passage (201e) disposed in a stage of the flow dividing passage (201d); The flow dividing member (201c) includes two sets of rotating plates (201c-1) disposed inside the fixing box (201a), a push rod (201c-2) disposed outside the rotating plates (201c-1), and a first return spring (201c-3) fixedly connected to the push rod (201c-2).The fire extinguishing device for a mine truck according to claim 4, characterized in that the current-carrying component (202) comprises a cam (202a) arranged on the top side of the push rod (201c-2), a first electrode strip (202b) fixedly connected to the cam (202a), a movable rod (202c) arranged on the top side of the cam (202a), a second return spring (202d) arranged on one side of the movable rod (202c), and a second electrode strip (202e) arranged on one side of the movable rod (202c).The fire extinguishing device for a mine truck according to claim 5, characterized in that the cleaning component (203) comprises a cleaning pipe (203a) disposed on one side of the mounting box (201a), two sets of stoppers (203b) disposed inside the mounting box (201a), a folding plate (203c) disposed on the top of the stoppers, a locking catch (203d) disposed inside the folding plate (203c), and a compression spring (203e) fixedly connected to the inside of the stoppers.The fire extinguishing apparatus for mine truck according to claim 2, characterized in that the fixing bracket (101a) is fixed at a position where the original fire extinguisher (102a) of the mine truck is disposed, the pipe of the fire extinguisher (102a) is attached to the bottom of the fixing box (201a), and the other end of the pipe of the fire extinguisher (102a) is fixedly connected to the changed fire extinguisher (102a) having a large capacity.The fire extinguishing apparatus for mine truck according to claim 7, characterized in that one end of the cleaning pipe (203a) is connected to the upper side of the mounting box (201a) and the other end is connected to a blower opening of the blower, the circuit of the blower being connected to the inside of the movable rod (202c) and being turned on or off by contact or non-contact with the first electrode strip (202b) and the second electrode strip (202e).The fire extinguishing apparatus for mine truck according to claim 3, characterized in that the elongated fire extinguishing pipe (102c) is wound around the surface of the rotary roller (101c), the flow dividing passage (201d) is disposed inside the rotary roller (101c), one end of which is connected to the mounting box (201a) through the center of the rotary roller (101c), and the other end of which is connected to the connecting passage (201e) and is connected to one end of the elongated fire extinguishing pipe (102c) through the connecting passage (201e).The fire extinguishing apparatus for mine truck according to claim 9, characterized in that the pipe of the fire extinguisher (102a) is sheathed and fixed to the elongated fire extinguishing pipe (102c), and after completion of the fire extinguishing material in the fire extinguisher (102a), mining and separation can be performed, and the pipe of the fire extinguisher (102a) and the fire extinguisher (102a) are changed.