CN108404324B

CN108404324B - Fire engine with walking mode selection function

Info

Publication number: CN108404324B
Application number: CN201810309896.XA
Authority: CN
Inventors: 张建明
Original assignee: Suzhou City Jieda Fire Protection Vehicle & Equipment Co ltd
Current assignee: Suzhou City Jieda Fire Protection Vehicle & Equipment Co ltd
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2022-12-30
Anticipated expiration: 2038-04-09
Also published as: CN108404324A

Abstract

A fire engine with a walking mode selection function belongs to the technical field of fire fighting facilities. Including automobile body and chassis, the automobile body sets up on the chassis, and this automobile body includes the locomotive, and this locomotive is connected with the chassis, and the chassis includes preceding travelling wheel, back walking wheel and frame, and preceding travelling wheel is established on the sedan-chair in the front, and back walking wheel is established on the sedan-chair in the back, and the one end and the preceding sedan-chair of frame are connected, and the other end is connected with the sedan-chair in the back, and characterized in that is still including crawler travel mechanism, and this crawler travel mechanism is corresponding to position between preceding, the back walking wheel sets up with reciprocating on the frame. The flexible selection requirement of different road conditions according to requirements can be met, the fire fighting truck can have two walking modes, the investment cost of fire fighting facilities can be saved, and resources are saved.

Description

Fire engine with walking mode selection function

Technical Field

The invention belongs to the technical field of fire-fighting facilities, and particularly relates to a fire fighting truck with a walking mode selection function.

Background

As is known in the art, fire fighting vehicles, airport fire fighting vehicles, professional fire fighting vehicles, elevating fire fighting vehicles, and back-up fire fighting vehicles, among others, are classified according to their functional use. The fire extinguishing fire truck comprises a pumping fire truck, a water tank fire truck, a foam fire truck, a dry powder fire truck and the like; the airport fire truck is specially used for treating airplane fire accidents, and can spray fire extinguishing agents during running, and comprises an airport rescue pilot fire truck, an emergency rescue fire truck and the like; the special fire truck comprises a communication command fire truck, a lighting fire truck, an emergency and disaster relief fire truck, an exploration fire truck, a propaganda fire truck, a smoke exhaust fire truck and the like; the elevating fire truck comprises an elevating platform fire truck, an elevating jet fire truck, an aerial ladder fire truck and the like; the back-up fire truck comprises a water supply fire truck, a foam fire truck, an ambulance fire truck and the like.

Technical information of fire trucks is not known in the published Chinese patent documents, such as CN101274127B (a miniature fire truck), CN101766875B (a multipurpose high-pressure fine water mist fire truck), CN101757753B (a light high-pressure fine water mist fire truck with combined spray gun spraying), CN 103623523528B (an urban turbojet fire truck), CN103958004B (a fire truck suitable for fire suppression of high-rise and super high-rise buildings), CN103599609A (super-suction deep-fire-extinguishing pump fire truck), CN103751931B (fire hose automatic laying fire truck), and CN 935285B (a bidirectional-running rail dual-purpose multifunctional rescue fire truck), and the like.

Not limiting to the above exemplified fire fighting vehicles, the common features are: because the walking mode of the fire engine depends on the wheels to walk, the adaptability to the change of the landform and the landform is relatively deficient, namely the fire engine has the picking property on the landform and the landform. For example, it is difficult or even impossible to travel under extreme terrain conditions such as wetlands, marshes, forests, snowfields, heavily frozen pavements, slopes, deserts, grasslands, cliffs, trenches and beaches, thereby limiting the exertion of the functions of the fire truck itself to some extent.

The walking mode of the crawler-type fire fighting truck can basically adapt to the running of the terrain and the landform, and technical information of the crawler-type fire fighting trucks can be seen in published Chinese patent documents, for example, CN203264106U recommends "a crawler-type high-power fire fighting truck", CN104740815A provides "all-terrain crawler-type multifunctional fire fighting truck", and CN105031857A introduces "a novel crawler-type fire fighting truck", but the walking mode is not limited to the advantages of good landform and landform adaptability of the exemplified aforementioned patents, but has the following disadvantages: the walking function of the fire engine is unique and can not be selected because the wheels with the inherent walking function of the fire engine are abandoned. However, during the process of fire fighting vehicle police, the probability of driving on a conventional road such as a town and country road is usually significantly greater than the probability of driving on the aforementioned extreme topographical surface. Thus, if the fire department is equipped with both the wheeled fire engine and the tracked fire engine, it will no doubt cause resource waste and significantly increase the purchase cost of the fire fighting equipment of the fire department by the government, and in addition, cause troubles in the resource allocation and daily management and maintenance of the garage of the fire department, and the technical solutions to be described below are brought about in this context.

Disclosure of Invention

The invention aims to provide a fire engine with a walking mode selection function, which is beneficial to selecting corresponding walking modes according to different road conditions and saving the investment cost of fire-fighting facilities and resources.

The invention aims to complete the task, and the fire fighting truck with the walking mode selection function comprises a truck body and a chassis, wherein the truck body is arranged on the chassis, the truck body comprises a truck head, the truck head is connected with the chassis, the chassis comprises a front walking wheel, a rear walking wheel and a truck frame, the front walking wheel is arranged on the front car, the rear walking wheel is arranged on the rear car, one end of the truck frame is connected with the front car, and the other end of the truck frame is connected with the rear car.

In a specific embodiment of the present invention, the frame includes a front frame member, a front frame sub-member, a rear frame member, and a rear frame sub-member, the front and rear frame members being longitudinally parallel to each other and one end of the front frame member and the rear frame member being connected to the front axle, the other end of the front frame member and the rear frame member being connected to the rear axle, the front frame sub-member being disposed along the longitudinal direction of the front frame member and fixed to the upper surface of the front frame member, the rear frame sub-member being disposed along the longitudinal direction of the rear frame member and fixed to the upper surface of the rear frame member, and the crawler traveling mechanism being connected to the front and rear frame members and the front and rear frame sub-members so as to move up and down at a position corresponding to between the front and rear traveling wheels.

In another embodiment of the invention, the crawler traveling mechanism comprises a base frame, a front portal frame, a rear portal frame, an oil tank, a front crawler traveling assembly lift cylinder, a rear crawler traveling assembly lift cylinder, a front crawler traveling assembly and a rear crawler traveling assembly, the front side of the base frame is fixed with the upper part of the front frame secondary beam and extends out of the front frame secondary beam, the rear side of the base frame is fixed with the upper part of the rear frame secondary beam and extends out of the rear frame secondary beam, the front portal frame and the rear portal frame are corresponding to each other in the left-right direction, the front parts of the front portal frame and the rear portal frame are in sliding fit with one side of the front frame girder back to the rear frame girder in a longitudinal state, the rear parts of the front portal frame and the rear portal frame are also in sliding fit with one side of the rear frame girder, which is back to the front frame girder, in a longitudinal state, the oil tank is arranged on the base frame, the lifting oil cylinder of the front crawler belt walking assembly is positioned between the front parts of the front portal frame and the rear portal frame and is fixed with one side of the front frame girder, which is back to the rear frame girder, in a longitudinal state, the front crawler travel assembly lifting oil cylinder column of the front crawler travel assembly lifting oil cylinder faces downwards, the rear crawler travel assembly lifting oil cylinder is positioned between the rear parts of the front portal frame and the rear portal frame and is fixed with one side of the rear frame girder back to the front frame girder in a longitudinal state, this back crawler travel assembly lift cylinder's back crawler travel assembly lift cylinder post is down, preceding crawler travel assembly with the place ahead bottom of preceding, back portal frame is connected and still simultaneously with preceding crawler travel assembly lift cylinder columnar connection, back crawler travel assembly with the rear bottom of preceding, back portal frame is connected and still simultaneously with back crawler travel assembly lift cylinder columnar connection, preceding crawler travel assembly and back crawler travel assembly with the oil tank oil circuit is connected.

In yet another specific embodiment of the present invention, a front portal frame front guide shoe is fixed to a side of the frame front girder facing away from the frame rear girder and at a position corresponding to a front of the front portal frame, the front portal frame front guide shoe is also fixed to a side of the frame front sub-beam facing away from the frame rear sub-beam, a rear portal frame front guide shoe is fixed to a side of the frame front girder facing away from the frame rear girder and at a position corresponding to a front of the rear portal frame, the rear portal frame front guide shoe is also fixed to a side of the frame front sub-beam facing away from the frame rear sub-beam, a front portal frame rear guide shoe is fixed to a side of the frame rear girder facing away from the frame front girder and at a position corresponding to a rear of the front portal frame, the front portal frame rear guide shoe is also fixed to a side of the frame rear sub-beam facing away from the frame front sub-beam, a side of the frame rear girder is fixed to a side of the frame rear frame and at a position corresponding to a rear of the rear portal frame, the portal frame front guide shoe is fixed to a side of the frame rear sub-beam facing away from the frame, and the frame rear sub-frame front sub-beam is fixed to a side of the frame; the front portal frame comprises a front portal frame front guide pillar, a front portal frame rear guide pillar and a front portal frame guide pillar crossbeam, the front portal frame front guide pillar is inserted into a front portal frame front guide pillar sliding seat and is in sliding fit with the front portal frame front guide pillar sliding seat, the front portal frame rear guide pillar is inserted into a front portal frame rear guide pillar sliding seat and is in sliding fit with the front portal frame rear guide pillar sliding seat, the front end of the front portal frame guide pillar crossbeam is fixed with the upper end of the front portal frame front guide pillar, and the rear end of the front portal frame guide pillar crossbeam is fixed with the upper end of the front portal frame rear guide pillar; the rear portal frame comprises a rear portal frame front guide pillar, a rear portal frame rear guide pillar and a rear portal frame guide pillar crossbeam, the rear portal frame front guide pillar is inserted into the rear portal frame front guide pillar sliding seat and is in sliding fit with the rear portal frame front guide pillar sliding seat, the rear portal frame rear guide pillar is inserted into the rear portal frame rear guide pillar sliding seat and is in sliding fit with the rear portal frame rear guide pillar sliding seat, the front end of the rear portal frame guide pillar crossbeam is fixed with the upper end of the rear portal frame front guide pillar, and the rear end of the rear portal frame guide pillar crossbeam is fixed with the upper end of the rear portal frame rear guide pillar; a front crawler traveling assembly lifting oil cylinder fixing seat is fixed on one side of the frame front girder, which is back to the frame rear girder, and at a position corresponding to between the front guide post sliding seats of the front portal frame and the rear guide post sliding seat; the front crawler traveling assembly connected with an oil tank oil way arranged on the base frame is connected with the lower end of a front guide post of the front portal frame and the lower end of a front guide post of the rear portal frame, and the rear crawler traveling assembly connected with the oil tank oil way is connected with the lower end of a rear guide post of the front portal frame and the lower end of a rear guide post of the rear portal frame; the tail end of the front crawler walking assembly lifting oil cylinder column is provided with a front crawler walking assembly lifting oil cylinder column connector, the tail end of the rear crawler walking assembly lifting oil cylinder column is provided with a rear crawler walking assembly lifting oil cylinder column connector, the front crawler walking assembly is connected with the front crawler walking assembly lifting oil cylinder column connector, and the rear crawler walking assembly is connected with the rear crawler walking assembly lifting oil cylinder column connector.

In a further embodiment of the present invention, a tank support bracket is fixed to the base frame at positions corresponding to the four corners of the fuel tank, a tank support fixing lug is fixed to each of the four corners of the fuel tank at positions corresponding to the tank support bracket, and a fixing lug screw is provided on the tank support fixing lug and fixed to the tank support bracket.

In still another embodiment of the present invention, the front track traveling assembly includes a lifting beam, a wheel carrier, a guide wheel, a driving wheel, a hydraulic driving motor, a wheel hub device and a front track, the left end of the lifting beam is fixedly connected to the bottom of the front guide post of the front portal frame, the middle of the lifting beam is connected to the front track traveling assembly lifting cylinder post connector of the front track traveling assembly lifting cylinder post, the right end of the lifting beam is fixedly connected to the bottom of the front guide post of the rear portal frame, the wheel carrier corresponds to the front side of the lifting beam, a wheel carrier front cantilever shaft and a wheel carrier rear cantilever shaft are fixed to the upper portion of the wheel carrier, the wheel carrier front cantilever shaft corresponds to the lower end of the front guide post of the front portal frame and is fixed to the lower end of the front guide post of the front portal frame, the wheel carrier rear cantilever shaft corresponds to the lower end of the front guide post of the rear portal frame and is fixed to the lower end of the front guide post of the rear portal frame, the guide wheel is rotatably disposed at the left end of the wheel carrier, the hydraulic driving motor is fixed to the oil path of the front track traveling assembly, and the hydraulic driving wheel hub device is connected to the hydraulic driving wheel hub device at the other end of the front track traveling assembly.

In a more specific embodiment of the present invention, a pair of cylinder post connector pin shaft seats are fixed on the upper portion of the lifting beam and at positions corresponding to the front crawler assembly lifting cylinder post connector, a cylinder post connector pin shaft groove is respectively arranged on the pair of cylinder post connector pin shaft seats and at positions corresponding to each other, the front crawler assembly lifting cylinder post connector corresponds to between the pair of cylinder post connector pin shaft seats, a cylinder post connector pin shaft is arranged on the cylinder post connector pin shaft groove, and the middle portion of the lifting beam is connected with the front crawler assembly lifting cylinder post by inserting the cylinder post connector pin shaft into the front crawler assembly lifting cylinder post connector; a belt supporting wheel shaft seat is fixed at the top of the wheel carrier and at the central position of the wheel carrier in the length direction, a belt supporting wheel shaft is fixed on the belt supporting wheel shaft seat, a belt supporting wheel is rotatably arranged on the belt supporting wheel shaft and is in contact with the inner side of the front crawler, and a supporting wheel is rotatably arranged at the bottom of the wheel carrier and along the length direction of the wheel carrier at intervals through a supporting wheel shaft and is in contact with the inner side of the front crawler; a driving wheel frame extends at the right end of the wheel frame and at the position corresponding to the hub device, and the hydraulic driving motor is fixed with the hub device through a hydraulic driving motor seat.

In a further embodiment of the present invention, the hub unit includes a shaft sleeve having a sleeve hole extending from one end of the shaft sleeve to the other end thereof, a sleeve fixing flange formed at an end of the shaft sleeve facing the driving wheel frame, the sleeve fixing flange being fixed to the driving wheel frame by a sleeve fixing flange plate screw, a hub sleeve flange formed at an end of the hub sleeve facing the sleeve fixing flange, a bearing provided between an inner wall of the hub sleeve and an outer wall of the shaft sleeve, a sleeve seal ring provided between the inner wall of the hub sleeve flange and the outer wall of the shaft sleeve, a half shaft cover fixed to an end surface of the hub sleeve facing away from the sleeve fixing flange by a half shaft cover fixing screw, a spline shaft head formed at a middle portion of a side of the half shaft cover facing the hydraulic driving motor shaft, a hydraulic driving motor shaft connected to the spline shaft, and an adjusting nut screwed to an end of the sleeve facing the half shaft cover, the bearing being fixed to the hub sleeve by the adjusting nut, the hub sleeve fixing flange plate being fixed to the driving wheel by a driving wheel, and the hydraulic driving motor fixed to the sleeve base of the hydraulic driving wheel.

In a still more specific embodiment of the present invention, a hydraulic drive motor shaft of the hydraulic drive motor protrudes into the shaft sleeve hole at a position corresponding to the spline shaft head, the spline shaft head is in transmission connection with the hydraulic drive motor shaft through a spline shaft head connecting sleeve, and the hydraulic drive motor shaft is a spline shaft.

In yet another embodiment of the present invention, driving wheel engaging pin bosses are formed at intervals in pairs on the inner side of the front crawler, and a driving wheel engaging pin is provided between each pair of driving wheel engaging pin bosses, the driving wheel engaging pin being engaged with the driving wheel; the guide wheel is rotationally arranged on a guide wheel bearing seat through a guide wheel shaft, the guide wheel bearing seat is movably arranged on the wheel carrier, a guide wheel tensioning device is arranged on the wheel carrier and at a position corresponding to the right side of the guide wheel bearing seat, the guide wheel tensioning device comprises a spring seat plate, a bearing seat support, a guide rail, a spring supporting sleeve and a spring, the spring seat plate is fixed in a wheel carrier cavity of the wheel carrier, the bearing seat support is in sliding fit with the guide rail at a position corresponding to the left side of the spring seat plate, the guide rail is fixed with the bottom wall of the cavity of the wheel carrier, the spring supporting sleeve is fixed with the right side of the bearing seat support in a horizontal cantilever state, the spring sleeve is arranged on the spring supporting sleeve, the left end of the spring is supported on a supporting sleeve spring seat formed on the spring supporting sleeve, the right end of the spring is supported on the left side of the spring seat plate, the bottom of the guide wheel bearing seat is in sliding fit with the guide rail, and the right side of the guide wheel bearing seat is fixedly connected with the bearing seat.

The technical scheme provided by the invention has the technical effects that: the liftable crawler traveling mechanism is additionally arranged between the front traveling wheel and the rear traveling wheel, so when the fire fighting truck runs on a normal road, the crawler traveling mechanism can be upwards folded, the front traveling wheel and the rear traveling wheel play a normal traveling role, and when the fire fighting truck runs on extreme roads such as wetlands, swamps, snowfields, severely frozen roads, slopes, deserts, grasslands, cliffs, trenches, mudflats and the like, the crawler traveling mechanism can descend, the crawler traveling mechanism replaces a front traveling wheel and plays a traveling role with the assistance of the rear traveling wheel, the requirements of flexible selection on different road conditions can be met, the fire fighting truck can have two traveling modes, the investment cost of fire fighting facilities can be saved, and resources can be saved.

Drawings

FIG. 1 is a schematic view of the present invention.

Fig. 2 is a detailed structural view of the crawler travel mechanism shown in fig. 1.

FIG. 3 is a cross-sectional view of a hub assembly of the front track assembly of the structural architecture of the track-running mechanism shown in FIG. 2.

Fig. 4 is a schematic view of fig. 2.

Fig. 5 is a cross-sectional view of fig. 2.

Fig. 6 is a schematic view of the overall structure of fig. 1.

Fig. 7 is a rear view of fig. 1 and 6.

Detailed Description

In order to make the technical spirit and advantages of the present invention more clearly understood, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the inventive concept, which are merely in form and are not essential, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position state of fig. 1, and thus, should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 1 and 6, a vehicle body 1 and a chassis 2 are shown, the vehicle body 1 is arranged on the chassis 2, the vehicle body 1 comprises a vehicle head 11, the vehicle head 11 is connected with the chassis 2, the chassis 2 comprises front traveling wheels 21, rear traveling wheels 22 and a frame 23, the front traveling wheels 21 are arranged on the front car, the rear traveling wheels 22 are arranged on the rear car, one end of the frame 23 is connected with the front car, and the other end is connected with the rear car.

As is known in the art and referring to fig. 1 and 6, there is no doubt a pair of the front road wheels 21 and the rear road wheels 22, and although only one front road wheel 21 and one rear road wheel 22 corresponding to the front side of the vehicle body 1 are shown in fig. 1 and 6, the understanding of those skilled in the art will not be confused. Fig. 1 and 6 also show a water cannon 12 (also referred to as a "fire cannon" or a "fire extinguishing cannon") and an auxiliary cannon 13 provided on the vehicle body 1, the auxiliary cannon 13 being supplied with water from an auxiliary cannon water introduction pipe 14 provided on the vehicle body 1, the fire cannon 12 being supplied with water from a booster pump provided separately on the vehicle body 1, the booster pump being supplied with water from a water introduction mechanism.

The technical key points of the technical scheme provided by the invention are as follows: the fire fighting truck further includes a crawler traveling mechanism 3, and the crawler traveling mechanism 3 is vertically, i.e., vertically, arranged on the frame 23 at a position corresponding to a position between the front and

rear traveling wheels

21, 22.

Referring to fig. 2, the frame 23 includes a front frame member 231, a front frame member 232, a rear frame member 233, and a rear frame member 234, the front and

rear frame members

231, 233 are longitudinally parallel to each other and one ends (left ends) of the front frame member 231 and the rear frame member 233 are connected to the front car, the other ends (right ends) of the front frame member 231 and the rear frame member 233 are connected to the rear car, the front frame member 232 is disposed along the longitudinal direction of the front frame member 231 and fixed to the upper surface of the front frame member 231, the rear frame member 234 is disposed along the longitudinal direction of the rear frame member 233 and fixed to the upper surface of the rear frame member 233, and the crawler traveling mechanism 3 is connected to the front and

rear frame members

231, 233 and the front and

rear frame members

232, 234 so as to be vertically movable, i.e., so as to be vertically movable, at a position corresponding to the position between the front and rear traveling

wheels

21, 22.

Continuing to refer to fig. 2, the above-mentioned crawler traveling mechanism 3 comprises a base frame 31, a front portal frame 32, a rear portal frame 33, an oil tank 34, a front crawler traveling assembly hoist cylinder 35, a rear crawler traveling assembly hoist cylinder 36, a front crawler traveling assembly 37 and a rear crawler traveling assembly not shown in the figure, the front side of the base frame 31 is fixed to the upper part of the front sub-frame 232 and protrudes out of the front sub-frame 232, the rear side of the base frame 31 is fixed to the upper part of the rear sub-frame 234 and protrudes out of the rear sub-frame 234, the front portal frame 32 and the rear portal frame 33 correspond to each other in the left-right direction, the front sides of the front portal frame 32 and the rear portal frame 33 are in a longitudinal state to be slidably fitted to the side of the front cross-frame 231 opposite to the front cross-frame 233 in the above-mentioned frame, the rear sides of the front portal frame 32 and the rear portal frame 33 are also in a longitudinal state to be slidably fitted to the side of the front cross-frame opposite to the front cross-frame 231, the oil tank 34 is disposed on the base frame 31, the front side of the front cross-frame 32 and the rear portal frame 33 and the crawler traveling assembly hoist cylinder 351, the crawler traveling assembly hoist cylinder 35 is connected to the front side of the front-boom cylinder 32 and the rear-crawler traveling cylinder 32 and the rear-hoist cylinder 32, and the rear-hoist cylinder assembly 33, and the crawler traveling cylinder hoist cylinder 32 is connected to the front side of the front-hoist cylinder assembly 33 and the rear-hoist cylinder 32, and the rear cross-hoist cylinder 32, and the rear sub-hoist cylinder 32, and the rear cross-hoist cylinder 32, and the rear sub-hoist cylinder 32, the rear crawler traveling assembly is connected to the rear bottoms of the front and

rear portal frames

32 and 33 and also to the rear crawler traveling assembly lift cylinder column, and the front crawler traveling assembly 37 and the rear crawler traveling assembly are connected to the oil tank 34 through oil passages.

Continuing to refer to fig. 2, a front portal frame front guide pillar slide mount 2311 is fixed by a front portal frame front guide pillar slide mount fixing screw 23111 on a side of the front portal frame 231 facing away from the rear portal frame 233, i.e., on a front side of the front portal frame 231 and in a position corresponding to the front of the front portal frame 32, the front portal frame front guide pillar slide mount 2311 is also fixed by a corresponding front portal frame front guide pillar slide mount fixing screw 23111 and a side of the front portal frame sub-beam 232 facing away from the rear portal frame sub-beam 234, i.e., on a front side of the front portal frame 232, a rear portal frame front guide pillar slide mount 2312 is fixed by a rear portal frame front guide pillar slide mount fixing screw 23121 on a side of the front portal frame 231 facing away from the rear portal frame 233, i.e., on a front side of the front portal frame 231 and in a position corresponding to the front of the rear portal frame 33, the rear portal frame front guide column slide seat 2312 is also fixed by a corresponding rear portal frame front guide column slide seat fixing screw 23121 and a side of the frame front sub-beam 232 facing away from the frame rear sub-beam 234, i.e. the front side of the frame front sub-beam 232, a front portal frame rear guide column slide seat 2331 is fixed by a front portal frame rear guide column slide seat fixing screw 23311 on a side of the frame rear sub-beam 233 facing away from the frame front sub-beam 231, i.e. the rear side of the frame rear sub-beam 234, and a portal frame rear guide column 2332 is fixed by a corresponding front portal frame rear guide column slide seat fixing screw 23311 and a side of the frame rear sub-beam 234 facing away from the frame front sub-beam 232, i.e. the rear side of the frame rear sub-beam 234, by a portal frame rear guide column slide seat fixing screw 23311, a portal frame rear guide column slide seat 2332 is fixed by a rear portal frame rear guide column slide seat fixing screw 23321 on a side of the frame rear sub-beam 233 facing away from the frame front sub-beam 231 and a position corresponding to the rear of the rear frame 33, the rear portal frame rear guide post sliding seat 2332 is also fixed to one side of the frame rear sub-beam 234 back to the frame front sub-beam 232, i.e. to the rear side of the frame rear sub-beam 234, by a corresponding rear portal frame rear guide post sliding seat fixing screw 23321.

Continuing to refer to fig. 2, the aforementioned front portal frame 32 includes a front portal frame front guide pillar 321, a front portal frame rear guide pillar 322 and a front portal frame guide pillar crossbeam 323, the front portal frame front guide pillar 321 is inserted into the front portal frame front guide pillar sliding seat 2311 and is in sliding fit with the front portal frame front guide pillar sliding seat 2311, the front portal frame rear guide pillar 322 is inserted into the front portal frame rear guide pillar sliding seat 2331 and is in sliding fit with the front portal frame rear guide pillar sliding seat 2331, the front end of the front portal frame guide pillar crossbeam 323 is fixed with the upper end (top in this embodiment) of the front portal frame front guide pillar 321 by a screw, and the rear end of the front portal frame guide pillar crossbeam 323 is fixed with the upper end (top in this embodiment) of the front portal frame rear guide pillar 322 by a screw; the rear gantry 33 includes a rear gantry front guide post 331, a rear gantry rear guide post 332 and a rear gantry guide post cross beam 333, the rear gantry front guide post 331 is inserted into the rear gantry front guide post sliding seat 2312 and is in sliding fit with the rear gantry front guide post sliding seat 2312, the rear gantry rear guide post 332 is inserted into the rear gantry rear guide post sliding seat 2332 and is in sliding fit with the rear gantry rear guide post sliding seat 2332, the front end of the rear gantry guide post cross beam 333 is fixed with the upper end (top in this embodiment) of the rear gantry front guide post 31 by a screw, and the rear end of the rear gantry guide post cross beam 333 is fixed with the upper end (top in this embodiment) of the rear gantry rear guide post 332 by a screw.

As shown in fig. 2, a front crawler travel assembly lift cylinder fixing base 2313 is fixed on the side of the front frame girder 231 opposite to the rear frame girder 233, i.e. on the front side of the front frame girder 231 and at a position corresponding to the space between the front and rear portal frame front guide

column sliding bases

2311 and 2312 by a lift cylinder fixing base screw 23131, a rear crawler assembly lift cylinder fixing seat 2333 is fixed to a side of the rear frame member 233 opposite to the front frame member 231, i.e., to a rear side of the rear frame member 233 and at a position corresponding to between the front and rear portal frame rear guide post sliding seats 2331 and 2332, by means of screws, the front crawler assembly lift cylinder 35 is fixed to the front crawler assembly lift cylinder fixing seat 2313, and the rear crawler assembly lift cylinder 36 is fixed to the rear crawler assembly lift cylinder fixing seat 2333.

Continuing to refer to fig. 2, the front crawler traveling assembly 37, which is connected to the oil tank 34 disposed on the base frame 31, is connected to the lower ends of the front gantry front guide post 321 and the rear gantry front guide post 331, and the rear crawler traveling assembly, which is also connected to the oil tank 34, is connected to the lower ends of the front gantry rear guide post 322 and the rear gantry rear guide post 332; a front crawler travel assembly lift cylinder post connector 3511 is formed at the end of the front crawler travel assembly lift cylinder post 351, a rear crawler travel assembly lift cylinder post connector is formed at the end of the rear crawler travel assembly lift cylinder post, the front crawler travel assembly 37 is connected with the front crawler travel assembly lift cylinder post connector 3511, and the rear crawler travel assembly is connected with the rear crawler travel assembly lift cylinder post connector.

Continuing to refer to fig. 2, a tank support bracket 311 is fixed to each of the base frame 31 at a position corresponding to each of the four corners of the tank 34, a tank support fixing lug 341 is fixed to each of the four corners of the tank 34 at a position corresponding to each of the tank support brackets 311, and a fixing lug screw 3411 is provided on the tank support fixing lug 341, the fixing lug screw 3411 being fixed to the tank support bracket 311.

Still referring to fig. 2, the front track traveling assembly 37 includes a lifting beam 371, a wheel frame 372, a guide wheel 373, a driving wheel 374, a hydraulic driving motor 375, a hub device 376 and a front track 377, the left end of the lifting beam 371 is fixedly connected (by welding) to the bottom of the front gantry front guide post 321, the middle of the lifting beam 371 is connected to the front track traveling assembly lifting cylinder post connector 3511 of the front track traveling assembly lifting cylinder post 351, the right end of the lifting beam 371 is fixedly connected (by welding) to the bottom of the rear gantry front guide post 331, the wheel frame 372 corresponds to the front side of the lifting beam 371, a wheel frame front suspension shaft 3721 and a wheel frame rear suspension shaft 3722 are fixed to the upper portion of the wheel frame 372, the wheel frame front suspension shaft 3721 corresponds to the lower end of the front gantry front guide post 321 and is fixed to the lower end of the front gantry front guide post 321 by welding, the wheel rear suspension shaft 3722 corresponds to the lower end of the rear gantry front guide post 331 and is fixed to the lower end of the front gantry front guide post 331 by welding, the left end of the driving wheel 376 is rotatably provided to the front wheel cylinder post 375, the driving wheel cylinder subunit 373 is connected to the hydraulic driving wheel cylinder device 3734, the front end of the driving wheel cylinder post 373, the driving wheel cylinder subunit 373 is connected to the front drive wheel cylinder device (by welding), the hydraulic driving wheel cylinder post) and the front wheel subunit 373, the front track 377, the driving wheel 373 and the front track cylinder device 373 (wheel 373 is connected to the driving wheel subunit 373 and the front wheel subunit 373 (the front wheel cylinder post). Since the structure of the rear crawler assembly is identical to that of the front crawler assembly 37, the applicant does not describe it again.

Referring to fig. 5 in conjunction with fig. 2, a pair of cylinder connecting head pin shaft seats 3711 are fixed on the upper portion of the lifting beam 371 and at positions corresponding to the front crawler travel assembly lifting cylinder connecting head 3511, a cylinder connecting head pin shaft slot 37111 is respectively disposed on the pair of cylinder connecting head pin shaft seats 3711 and at positions corresponding to each other, the front crawler travel assembly lifting cylinder connecting head 3511 corresponds to a position between the pair of cylinder connecting head pin shaft seats 3711, a cylinder connecting head pin shaft 37112 is disposed on the cylinder connecting head pin shaft slot 37111, and the middle portion of the lifting beam 371 is connected to the front crawler travel assembly lifting cylinder 351 by inserting the cylinder connecting head pin shaft 37112 into the front crawler travel assembly lifting cylinder connecting head 3511 (the shaft hole has a connecting head pin shaft); a belt supporting pulley shaft seat 3726 is fixed on the top of the wheel frame 372 and at the central position of the wheel frame 372 in the length direction, a belt supporting pulley shaft 37261 is fixed on the belt supporting pulley shaft seat 3726, a belt supporting pulley 37262 is rotatably arranged on the belt supporting pulley shaft 37261, and the belt supporting pulley 37262 contacts with the inner side of the front crawler 377. A bogie wheel 3723 is rotatably provided at the bottom of the wheel frame 372 and at intervals along the longitudinal direction of the wheel frame 372 by a bogie axle 37231, and the bogie wheel 3723 is in contact with the inner side of the front crawler 377.

A driving wheel frame 3724 extends from the right end of the wheel frame 372 and corresponds to the wheel hub 376, and the hydraulic driving motor 375 is fixed to the wheel hub 376 through a hydraulic driving motor seat 3752.

Referring to fig. 3, the wheel hub assembly 376 includes a shaft sleeve 3761, a hub sleeve 3762, an axle shaft cover 3763 and an adjusting nut 3764, the shaft sleeve 3761 has a shaft sleeve hole 37613, the shaft sleeve hole 37613 passes through from one end of the shaft sleeve 3761 to the other end, one end of the shaft sleeve 3761 facing the driving wheel frame 3724 is formed with a shaft sleeve fixing flange 37611, the shaft sleeve fixing flange 37611 is fixed to the driving wheel frame 3724 by a shaft sleeve fixing flange screw 37612, one end of the hub sleeve 3762 facing the shaft sleeve fixing flange 37611 is formed with a hub sleeve flange 37621, a bearing 3765 is disposed between the inner wall of the hub sleeve 3762 and the outer wall of the shaft sleeve 3761, a shaft sleeve sealing ring 3766 is disposed between the inner wall of the hub sleeve flange 37621 and the outer wall of the shaft sleeve 3761, the axle shaft cover 3763 is fixed to one end face of the shaft sleeve 37611 facing the hub sleeve fixing flange 3762 by a half shaft cover fixing screw 37632, the shaft cover 37631 is connected to one end face of the shaft sleeve fixing flange 37611 of the shaft 3763, the shaft cover 3763 is connected to the spline shaft 3751 of the driving wheel sleeve 3763, the shaft sleeve 3763 is connected to the hydraulic pressure adjusting nut 3764, and the hydraulic pressure adjusting nut 37521 is fixed to the driving wheel 3741, and the hydraulic pressure adjusting nut 37521, and the hydraulic pressure fixing flange 37521 is fixed to the hydraulic pressure fixing flange 3741, and the hydraulic pressure fixing flange 37521, and the hydraulic pressure fixing flange 3741.

During assembly, the adjusting nut 3764 is screwed to the shaft sleeve 3761, and the half axle cover 3763 is fixed to the shaft sleeve 3762 by the half axle cover fixing screw 37632, according to the conventional knowledge.

As shown in fig. 3, a hydraulic drive motor shaft 3751 of the hydraulic drive motor 375 projects into the sleeve hole 37613 at a position corresponding to the spline shaft head 37631, and the spline shaft head 37631 is drivingly connected to a hydraulic drive motor shaft 3751, which is a spline shaft, through a spline shaft head connection sleeve 37633.

Referring to fig. 4 in conjunction with fig. 2, driving wheel engaging pin receptacles 3771 are formed at intervals in pairs inside the front crawler 377, a driving wheel engaging pin 37711 is provided between each pair of driving wheel engaging pin receptacles 3771, the driving wheel engaging pin 37711 engages with the teeth of the driving wheel 374, and as shown in fig. 2 and 4, the guiding wheel 373 and the driving wheel 374 are substantially chains; the aforementioned guide wheel 373 is rotatably disposed on the guide wheel bearing seat 3731 by the guide wheel shaft 3732, the guide wheel bearing seat 3731 is movably disposed on the aforementioned wheel carriage 372, a guide wheel tension device 378 is disposed on the wheel carriage 372 at a position corresponding to the right side of the guide wheel bearing seat 3731, the guide wheel tension device 378 includes a spring seat plate 3781, a bearing seat bracket 3782, a guide rail 3783, a spring support sleeve 3784 and a spring 3785, the spring seat plate 3781 is fixed in the wheel carriage cavity 3725 of the wheel carriage 372, the bearing seat bracket 3782 is slidably engaged with the guide rail 3783 at a position corresponding to the left side of the spring seat plate 3781, the guide rail 3783 is fixed to the cavity bottom wall of the wheel carriage cavity 3725, the spring support sleeve 3784 is fixed to the right side of the bearing seat bracket 3782 in a horizontally cantilevered state, the spring 3785 is sleeved on the spring support sleeve 3784, the left end of the spring 3785 is supported on the support sleeve 37841 formed on the spring support sleeve 3784, the right end of the spring 3781, the guide wheel bearing seat 3783 is slidably engaged with the guide wheel bearing seat 3731 and the guide wheel bearing seat 3731 is connected to the guide wheel bearing seat 3731.

As will be appreciated from a reading of fig. 4 and in connection with the above description by the applicant: the spring 3785 applies a leftward acting force (spring force) to the spring bearing 3784, so that the bearing support 3782 and the guide wheel bearing 3731 apply a leftward acting force to the front crawler 377, the guide wheel bearing 3731 drives the guide wheel 373, and finally the front crawler 377 is in a good tensioning effect, and passive movement is avoided.

Referring to fig. 7, fig. 7 is a rear schematic view of fig. 1 and 6, showing the water monitor 12 being provided with a fire-fighting water tee 121, and water from the booster pump being led to the water monitor 12 through the tee 121.

Since the operating principles and processes of the front and rear crawler travel

assembly lift cylinders

35, 36 are the same and operate synchronously, the operating principles of the front crawler travel assembly 37 and the rear crawler travel assembly are the same and operate in the same operating state and operate synchronously. Accordingly, applicant below describes only the front track travel assembly lift cylinder 35 and the front track travel assembly 37.

When the fire fighting truck runs on a conventional road such as a relatively flat urban and rural road, the vehicle-mounted hydraulic control mechanism on the fire fighting truck makes the front crawler travel assembly lift cylinder 35 work, the front crawler travel assembly lift cylinder column 351 moves upwards into the cylinder body, and the lifting beam 371 is driven to move upwards, because the bottoms of the front gantry front guide column 321 and the rear gantry front guide column 331 are fixed with the lifting die beam 371 in a welding mode, that is, because the left end and the right end of the lifting beam 371 are fixed with the bottoms of the front gantry front guide column 321 and the rear gantry front guide column 331 respectively in a welding mode, when the front crawler travel assembly lift cylinder column 351 moves upwards, the lifting beam 371 is driven to move upwards, and the lifting beam 371 drives the front gantry front guide column 321 and the rear gantry front guide column 331 to move upwards. Because the front and rear ends of the wheel frame 372 are respectively fixedly connected with the lower ends of the

front guide posts

321 and 331 of the front and rear portal frames through the front and

rear cantilever shafts

3721 and 3722 of the wheel frame, the wheel frame 372 is driven to simultaneously move upwards in the process of upward displacement of the front and

rear portal frames

321 and 331, the wheel frame 372 drives the guide wheel 373 and the driving wheel 374 to move upwards, and a suspension distance is formed between the front crawler 377 and the floor when the front crawler 377 moves upwards, so that the whole crawler traveling mechanism 3 does not participate in traveling, namely, the front and rear traveling

wheels

21 and 22 perform a traveling task.

When the applicant encounters the extreme section, i.e. the topographical features, such as wetlands, marshes, snowfields, heavily frozen pavements, slopes, deserts, cliffs, trenches and beaches mentioned above, the crawler traveling mechanism 3 is lowered, replacing the front running wheels 21, in the reverse process described above, with the front crawler 377 and the rear running wheels 22 serving as the traveling tasks, while the front running wheels 21 are in a standby state of being out of operation. In this state, the hydraulic drive motor 375 operates, the hydraulic drive motor shaft 375 drives the spline shaft head 37631 through the spline shaft head connecting sleeve 37633, the spline shaft head 37631 drives the half shaft cover 3763, the half shaft cover 3763 is fixedly connected with the hub sleeve 3762, and the drive wheel 374 is fixed with the hub sleeve flange 37621 through the drive wheel screw 3741, so that when the hydraulic drive motor shaft 3751 drives the spline shaft head 37631 to move, the spline shaft head 37631 drives the half shaft cover 3763, the half shaft cover 3763 drives the hub sleeve 3762, the hub sleeve 3762 drives the drive wheel 374, and the drive wheel 374 drives the front crawler 377 to move around the guide wheel 373 and the drive wheel 374, so that the fire truck can walk.

In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.

Claims

1. The fire fighting truck with the walking mode selection function comprises a truck body (1) and a chassis (2), wherein the truck body (1) is arranged on the chassis (2), the truck body (1) comprises a truck head (11), the truck head (11) is connected with the chassis (2), the chassis (2) comprises a front walking wheel (21), a rear walking wheel (22) and a truck frame (23), the front walking wheel (21) is arranged on a front truck frame, the rear walking wheel (22) is arranged on a rear truck frame, one end of the truck frame (23) is connected with the front truck frame, the other end of the truck frame is connected with the rear truck frame, and the fire fighting truck is characterized by further comprising a crawler walking mechanism (3), and the crawler walking mechanism (3) is arranged on the truck frame (23) in a manner of moving up and down corresponding to the position between the front walking wheel (21) and the rear walking wheel (22); the frame (23) comprises a frame front girder (231), a frame front sub-beam (232), a frame rear girder (233) and a frame rear sub-beam (234), the frame front girder (231) and the frame rear girder (233) are kept parallel to each other in the length direction, one end of the frame front girder (231) and one end of the frame rear girder (233) are connected with the front car, the other end of the frame front girder (231) and the other end of the frame rear girder (233) are connected with the rear car, the frame front sub-beam (232) is arranged along the length direction of the frame front girder (231) and fixed with the upper surface of the frame front girder (231), the frame rear sub-beam (234) is arranged along the length direction of the frame rear girder (233) and fixed with the upper surface of the frame rear girder (233), and the traveling mechanism (3) is connected with the frame front girder (231), the frame rear sub-beam (233) and the frame rear sub-beam (232) of the crawler belt in a manner of moving up and down; the crawler traveling mechanism (3) comprises a base frame (31), a front portal frame (32), a rear portal frame (33), an oil tank (34), a front crawler traveling assembly lifting oil cylinder (35), a rear crawler traveling assembly lifting oil cylinder (36), a front crawler traveling assembly (37) and a rear crawler traveling assembly, wherein the front side of the base frame (31) is fixed with the upper part of the front frame auxiliary beam (232) and protrudes out of the front frame auxiliary beam (232), the rear side of the base frame (31) is fixed with the upper part of the rear frame auxiliary beam (234) and protrudes out of the rear frame auxiliary beam (234), the front portal frame (32) and the rear portal frame (33) correspond to each other left and right, the front sides of the front portal frame (32) and the rear portal frame (33) are in a longitudinal state and are in sliding fit with one side of the front frame main beam (231) back to the rear frame auxiliary beam (233), the rear sides of the front portal frame (32) and the rear portal frame (33) are also in a longitudinal state and are in sliding fit with one side of the front frame rear frame auxiliary beam (233) back to the front frame (231) and the front side of the front frame (233) and the base frame lifting oil cylinder (31) and the base frame (233) are arranged on the front side of the front frame (31 and the rear portal frame (233) and the front side of the rear portal frame (233) and the base frame (32) and the rear portal frame (233) and are in a sliding fit with the base frame (233) and the base frame (32) and the oil cylinder (233) and the base frame (233) and the oil cylinder (233) are in a longitudinal state, a front crawler assembly lifting cylinder column (351) of the front crawler assembly lifting cylinder (35) faces downwards, a rear crawler assembly lifting cylinder (36) is located between the rear portions of a front portal frame (32) and a rear portal frame (33) and is fixed with one side, back to a frame front girder (231), of a frame rear girder (233) in a longitudinal state, a rear crawler assembly lifting cylinder column of the rear crawler assembly lifting cylinder (36) faces downwards, a front crawler assembly (37) is connected with the front bottoms of the front portal frame (32) and the rear portal frame (33) and is also connected with the front crawler assembly lifting cylinder column (351) at the same time, a rear crawler assembly is connected with the rear bottoms of the front portal frame (32) and the rear portal frame (33) and is also connected with the rear crawler assembly lifting cylinder column at the same time, and the front crawler assembly (37) and the rear crawler assembly are connected with an oil way of the crawler assembly lifting cylinder column (34); a front portal frame front guide column sliding seat (2311) is fixed on one side of the frame front girder (231) back to the frame rear girder (233) and at a position corresponding to the front of the front portal frame (32), the front portal frame front guide column sliding seat (2311) is also fixed with one side of the frame front auxiliary beam (232) back to the frame rear auxiliary beam (234), a rear portal frame front guide column sliding seat (2312) is fixed on one side of the frame front girder (231) back to the frame rear girder (233) and at a position corresponding to the front of the rear portal frame (33), the front guide column sliding seat (2312) of the rear portal frame is also fixed with one side of the front auxiliary beam (232) of the frame back to the rear auxiliary beam (234) of the frame, a front portal frame rear guide post sliding seat (2331) is fixed on one side of the frame rear girder (233) back to the frame front girder (231) and at a position corresponding to the rear of the front portal frame (32), the rear guide post sliding seat (2331) of the front portal frame is also fixed with one side of the rear auxiliary beam (234) of the frame, which is back to the front auxiliary beam (232) of the frame, a rear portal frame rear guide pillar sliding seat (2332) is fixed at one side of the frame rear girder (233) back to the frame front girder (231) and at a position corresponding to the rear part of the rear portal frame (33), the rear guide post sliding seat (2332) of the rear portal frame is also fixed with one side of a rear auxiliary beam (234) of the frame, which is back to the front auxiliary beam (232) of the frame; the front portal frame (32) comprises a front portal frame front guide post (321), a front portal frame rear guide post (322) and a front portal frame guide post cross beam (323), the front portal frame front guide post (321) is inserted into a front portal frame front guide post sliding seat (2311) and is in sliding fit with the front portal frame front guide post sliding seat (2311), the front portal frame rear guide post (322) is inserted into a front portal frame rear guide post sliding seat (2331) and is in sliding fit with a front portal frame rear guide post sliding seat (2331), the front end of the front portal frame guide post cross beam (323) is fixed with the upper end of the front portal frame front guide post (321), and the rear end of the front portal frame guide post cross beam (323) is fixed with the upper end of the front portal frame rear guide post (322); the rear portal frame (33) comprises a rear portal frame front guide post (331), a rear portal frame rear guide post (332) and a rear portal frame guide post cross beam (333), the rear portal frame front guide post (331) is inserted into the rear portal frame front guide post sliding seat (2312) and is in sliding fit with the rear portal frame front guide post sliding seat (2312), the rear portal frame rear guide post (332) is inserted into the rear portal frame rear guide post sliding seat (2332) and is in sliding fit with the rear portal frame rear guide post sliding seat (2332), the front end of the rear portal frame guide post cross beam (333) is fixed with the upper end of the rear portal frame front guide post (31), and the rear end of the rear portal frame guide post cross beam (333) is fixed with the upper end of the rear portal frame rear guide post (332); a front crawler traveling assembly lifting oil cylinder fixing seat (2313) is fixed on one side of the frame front girder (231) opposite to the frame rear girder (233) and at a position corresponding to a position between the front portal frame front guide column sliding seat (2311) and the rear portal frame front guide column sliding seat (2312), a rear crawler traveling assembly lifting oil cylinder fixing seat (2333) is fixed on one side of the frame rear girder (233) opposite to the frame front girder (231) and at a position corresponding to a position between the front portal frame rear guide column sliding seat (2331) and the rear portal frame rear guide column sliding seat (2332), the front crawler traveling assembly lifting oil cylinder (35) is fixed with the front crawler traveling assembly lifting oil cylinder fixing seat (2313), and the rear crawler traveling assembly lifting oil cylinder (36) is fixed with the rear crawler traveling assembly lifting oil cylinder fixing seat (2333); the front crawler traveling assembly (37) which is connected with an oil way of an oil tank (34) arranged on the base frame (31) is connected with the lower end of the front portal frame front guide post (321) and the lower end of the rear portal frame front guide post (331), and the rear crawler traveling assembly which is also connected with the oil way of the oil tank (34) is connected with the lower end of the front portal frame rear guide post (322) and the lower end of the rear portal frame rear guide post (332); a front crawler walking assembly lifting oil cylinder column connector (3511) is formed at the tail end of the front crawler walking assembly lifting oil cylinder column (351), a rear crawler walking assembly lifting oil cylinder column connector is formed at the tail end of the rear crawler walking assembly lifting oil cylinder column, the front crawler walking assembly (37) is connected with the front crawler walking assembly lifting oil cylinder column connector (3511), and the rear crawler walking assembly is connected with the rear crawler walking assembly lifting oil cylinder column connector; a tank support bracket (311) is fixed on the base frame (31) at the positions corresponding to the four corners of the oil tank (34), an oil tank support fixing lug (341) is fixed at the four corners of the oil tank (34) at the position corresponding to the oil tank support bracket (311), a fixing lug screw (3411) is arranged on the oil tank support fixing lug (341), and the fixing lug screw (3411) is fixed with the oil tank support bracket (311); the front crawler traveling assembly (37) comprises a lifting cross beam (371), a wheel frame (372), a guide wheel (373), a driving wheel (374), a hydraulic driving motor (375), a hub device (376) and a front crawler (377), the left end of the lifting cross beam (371) is fixedly connected with the bottom of the front portal frame front guide column (321), the middle part of the lifting cross beam is connected with a front crawler traveling assembly lifting cylinder column connector (3511) of a front crawler traveling assembly lifting cylinder column (351), the right end of the lifting cross beam (371) is fixedly connected with the bottom of the rear portal frame front guide column (331), the wheel frame (372) corresponds to the front side of the lifting cross beam (371), a wheel frame front cantilever shaft (3721) and a wheel frame rear cantilever shaft (3722) are fixed on the upper part of the wheel frame (372), the wheel frame front cantilever shaft (3721) corresponds to the lower end of the front portal frame front guide column (321) and is fixed to the lower end of the front portal frame front guide column (321), the wheel frame rear cantilever shaft (3722) corresponds to the lower end of the rear cantilever shaft (37372) of the front portal frame front guide column (331) and is fixed to the lower end of the portal frame front portal frame (321), the wheel frame (373) and the hydraulic driving wheel (34) is arranged on the rear roller frame (375), the rear cantilever shaft (372), the driving wheel (374) is fixed with the hub device (376), the hub device (376) is connected with a hydraulic driving motor shaft (3751) of a hydraulic driving motor (375), one end of the front crawler belt (377) is sleeved on the guiding wheel (373), the other end of the front crawler belt is sleeved on the driving wheel (374), and the structure of the rear crawler belt walking assembly is the same as that of the front crawler belt walking assembly (37); a pair of cylinder column connecting head pin shaft seats (3711) are fixed on the upper part of the lifting beam (371) and at positions corresponding to the front crawler walking assembly lifting cylinder column connecting heads (3511), cylinder column connecting head pin shaft grooves (37111) are respectively arranged on the pair of cylinder column connecting head pin shaft seats (3711) and at positions corresponding to each other, the front crawler walking assembly lifting cylinder column connecting heads (3511) correspond to positions between the pair of cylinder column connecting head pin shaft seats (3711), cylinder column connecting head pin shafts (37112) are arranged on the cylinder column connecting head pin shaft grooves (37111), and the middle parts of the lifting beam (371) are connected with the front crawler walking assembly lifting cylinder columns (351) by inserting the cylinder column connecting head pin shafts (37112) into the front crawler walking assembly lifting cylinder column connecting heads (3511).

2. The fire engine having a walking mode selecting function according to claim 1, wherein a carrier roller shaft seat (3726) is fixed to a top portion of the wheel frame (372) at a central position in a length direction of the wheel frame (372), a carrier roller shaft (37261) is fixed to the carrier roller shaft seat (3726), a carrier roller (37262) is rotatably provided to the carrier roller shaft (37261), the carrier roller (37262) is in contact with an inner side of the front crawler (377), a bogie wheel (3723) is rotatably provided to a bottom portion of the wheel frame (372) at intervals along the length direction of the wheel frame (372) through a bogie shaft (37231), and the bogie wheel (3723) is in contact with the inner side of the front crawler (377); a driving wheel frame (3724) extends at the right end of the wheel frame (372) and at the position corresponding to the wheel hub device (376), and the hydraulic driving motor (375) is fixed with the wheel hub device (376) through a hydraulic driving motor seat (3752).

3. The fire engine with the traveling mode selecting function according to claim 2, wherein the hub unit (376) includes a shaft sleeve (3761), a hub sleeve (3762), a half shaft cover (3763) and an adjusting nut (3764), the shaft sleeve (3761) has a shaft sleeve hole (37613), the shaft sleeve hole (37613) passes through from one end of the shaft sleeve (3761) to the other end, the end of the shaft sleeve (3761) facing the driving wheel carrier (3724) is formed with a shaft sleeve fixing flange (37611), the shaft sleeve fixing flange (37611) is fixed to the driving wheel carrier (3724) by a shaft sleeve fixing flange screw (37612), the end of the hub sleeve (3762) facing the shaft sleeve fixing flange (37611) is formed with a hub sleeve flange (37621), a bearing (3765) is provided between the inner wall of the hub sleeve (3762) and the outer wall of the shaft sleeve (3761), a shaft sleeve sealing ring (3766) is provided between the inner wall of the hub sleeve (3762) and the outer wall of the shaft sleeve (3761), the half shaft sleeve (3763) is connected to the hydraulic pressure of the shaft cover (37631) at a position where the shaft sleeve fixing flange (3763) faces the driving wheel carrier (3751), the shaft cover (37631), an adjusting nut (3764) is screwed at one end of the hub sleeve (3762) facing to the half shaft cover (3763), the bearing (3765) is limited by the adjusting nut (3764), the driving wheel (374) is fixed with the hub sleeve flange plate (37621) through a driving wheel screw (3741), and the hydraulic driving motor seat (3752) is fixed with the shaft sleeve fixing flange plate (37611) through a hydraulic driving motor seat screw (37521).

4. The fire engine with walking mode selecting function as claimed in claim 3, wherein the hydraulic drive motor shaft (3751) of the hydraulic drive motor (375) is inserted into the shaft sleeve hole (37613) at a position corresponding to the spline shaft head (37631), the spline shaft head (37631) is in transmission connection with the hydraulic drive motor shaft (3751) through the spline shaft head connecting sleeve (37633), and the hydraulic drive motor shaft is a spline shaft.

5. The fire engine having a walking mode selecting function according to claim 1, wherein driving wheel engaging pin housings (3771) are formed at an interval in a matched pair form at an inner side of the front crawler (377), a driving wheel engaging pin (37711) is provided between each pair of driving wheel engaging pin housings (3771), and the driving wheel engaging pin (37711) is engaged with the driving wheel (374); the guide wheel (373) is rotationally arranged on a guide wheel bearing seat (3731) through a guide wheel shaft (3732), the guide wheel bearing seat (3731) is movably arranged on the wheel frame (372), a guide wheel tension device (378) is arranged on the wheel frame (372) and at the position corresponding to the right side of the guide wheel bearing seat (3731), the guide wheel tensioning device (378) comprises a spring seat plate (3781), a bearing seat support (3782), a guide rail (3783), a spring support sleeve (3784) and a spring (3785), wherein the spring seat plate (3781) is fixed in a wheel frame cavity (3725) of a wheel frame (372), the bearing seat support (3782) is in sliding fit with the guide rail (3783) at a position corresponding to the left side of the spring seat plate (3781), the guide rail (3783) is fixed with the cavity bottom wall of the wheel carrier cavity (3725), the spring supporting sleeve (3784) is fixed with the right side of the bearing seat bracket (3782) in a horizontal cantilever state, the spring (3785) is sleeved on the spring supporting sleeve (3784), the left end of the spring (3785) is supported on a supporting sleeve spring seat (37841) formed on a spring supporting sleeve (3784), the right end of the spring (3785) is supported on the left side of the spring seat plate (3781), the bottom of the guide wheel bearing seat (3731) is in sliding fit with the guide rail (3783), and the right side of the guide wheel bearing seat (3731) is fixedly connected with the bearing seat support (3782).