Crawler-type chassis for multifunctional fire extinguishing vehicle

Abstract

The utility model provides a crawler-type chassis for a multifunctional fire extinguishing vehicle, which is easy to cross obstacles, reduces power loss, is more stable during walking, relieves bumping, and is particularly suitable for running on a bumpy road surface. The driving wheel is driven by a power device arranged on a chassis to rotate and is used for driving the crawler belt; the tensioning wheel is arranged on the chassis and is used for tensioning the crawler belt; the supporting wheel is arranged above the side part of the chassis and is used for supporting the upper section of the crawler belt; the bearing wheel is arranged below the side part of the chassis and is in contact with the lower section of the crawler belt; the front bearing wheel and the rear bearing wheel in each pair of bearing wheels are jointly hinged to the front end and the rear end of an angular wheel carrier, and the angular point of the upper portion of the middle of the angular wheel carrier is hinged to the chassis.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tracked chassis, in particular to a tracked chassis of a multifunctional fire truck for extinguishing forest fires. BACKGROUND

[0002] The multifunctional fire truck for extinguishing forest fires needs to run on rugged road surfaces. Since there are often protruding obstacles such as stones and small hillocks on the road surface, the tracked chassis of the multifunctional fire truck needs to consume a high power to cross the obstacles, and sometimes cannot cross the obstacles.

[0003] Moreover, the road surface is rugged, and the tracked chassis has a large fluctuation, which makes the driver in the cockpit on the upper part of the chassis feel uncomfortable and difficult to control the posture, and is prone to be injured by colliding with the cockpit. SUMMARY

[0004] The utility model aims at providing a tracked chassis for a multifunctional fire truck, which can easily cross obstacles, reduce power consumption, and make the chassis stable when running, thereby reducing the jolt and being especially suitable for running on rugged road surfaces.

[0005] To achieve the above technical purpose, the utility model adopts the technical scheme that:

[0006] The tracked chassis for the multifunctional fire truck comprises a tracked belt, a driving wheel for driving the tracked belt, which rotates under the driving of a power device arranged on the chassis, a tensioning wheel arranged on the chassis for tensioning the tracked belt, a supporting wheel arranged above the side part of the chassis for supporting the upper part of the tracked belt, and a load-bearing wheel arranged below the side part of the chassis and in contact with the lower part of the tracked belt.

[0007] The tracked chassis further comprises a plurality of torsion rods, the corner point of each angle-shaped wheel frame is hinged to the lower end of a torsion rod, and the upper end of the torsion rod is hinged to the lower side of the chassis; a reset device is arranged between the torsion rod and the chassis, which makes the torsion rod in a balanced position relative to the chassis; when the torsion rod deviates from the balanced position, the reset device exerts a force on the torsion rod to make the torsion rod return to the balanced position.

[0008] The tracked chassis comprises an upper horizontal shaft, a lower horizontal shaft, and a connecting rod; the upper horizontal shaft and the lower horizontal shaft are parallel to each other, and the two ends of the connecting rod are fixedly connected to the upper horizontal shaft and the lower horizontal shaft, respectively; the upper horizontal shaft extends transversely along the chassis and is hinged to the side part of the chassis; and the lower horizontal shaft is hinged to the corner point of the angle-shaped wheel frame through a bearing seat.

[0009] The reset device comprises a damping shell with an inner corner, an elastic damping column located at the inner corner of the damping shell, and a damping wheel fixed to the upper transverse shaft in a circumferential direction, wherein the damping wheel has a concave surface in the circumferential direction, and the concave surface is in contact with the outer surface of the elastic damping column.

[0010] The track chassis has an angle-shaped wheel frame with a front rod and a rear rod fixedly connected in an angle shape, a lower end of the front rod is fixed with a front wheel shaft, two front load wheels are rotatably arranged on the front wheel shaft, a lower end of the rear rod is fixed with a rear wheel shaft, and two rear load wheels are rotatably arranged on the rear wheel shaft.

[0011] The angle between the front rod and the rear rod is a, and 60°≤a≤120°.

[0012] The track chassis has an angle-shaped wheel frame with a front rod and a rear rod fixedly connected in an angle shape, a lower end of the front rod is fixed with a front wheel shaft, two front load wheels are rotatably arranged on the front wheel shaft, a lower end of the rear rod is fixed with a rear wheel shaft, and two rear load wheels are rotatably arranged on the rear wheel shaft.

[0013] The angle-shaped wheel frame hinged at the lower end of the chassis or the torsion rod can swing forward and backward, so that when the walking track encounters higher protrusions such as stones and other obstacles, the angle-shaped wheel frame can swing forward, the front load wheels located on the angle-shaped wheel frame can be lifted and jumped, so that the track smoothly climbs onto the protrusions, and the track is more easily to continue to move through the obstacles.

[0014] The reset device makes the torsion rod swing up and down at the balance position all the time, reduces the bumping of the chassis, and is especially suitable for the fire extinguishing vehicle to pass through rugged road surfaces, and reduces the discomfort of the driver.

[0015] The reset device composed of the damping shell, the elastic damping column (such as a rubber column), and the damping wheel has simple structure, can provide large damping force, and has low cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a whole front view of the multifunctional fire extinguishing vehicle;

[0017] Figure 2 is a whole top view of the multifunctional fire extinguishing vehicle;

[0018] Figure 3 , Figure 4 is a schematic view of the air outlet pipe swinging up and down to different states;

[0019] Figure 5 , Figure 6 is a schematic view of the air outlet pipe swinging horizontally to different states;

[0020] Figure 7 , Figure 8 , Figure 9 are respectively a front view, a top view, and a side view of the track chassis;

[0021] Figure 10 isFigure 8 AA section view in the middle;

[0022] Figure 11 This is a schematic diagram of a tracked chassis encountering an obstacle;

[0023] Figure 12 , Figure 13 , Figure 14 These are the front view, top view, and side view of the fire monitor.

[0024] Figure 15 , Figure 16 It is a schematic diagram of the nozzle swinging up and down to different states;

[0025] Figure 17 , Figure 18 This is a schematic diagram of the gun body swinging horizontally to different states;

[0026] In the diagram, the extinguishing agent pumping device 101 and the reciprocating air compressor 102 are shown.

[0027] Tracked chassis 200, chassis 201, frame 202, drive wheel 203, tension wheel 204, carrier roller 205, load-bearing roller 206, torsion bar 207, upper horizontal shaft 2071, lower horizontal shaft 2072, connecting rod 2073.

[0028] Angular wheel frame 208, front bar 2081, rear bar 2082, bearing housing 2083.

[0029] Reset device 209, damping shell 2091, elastic damping column 2092, damping wheel 2093, concave surface 2094

[0030] Road clearing unit 300, pivot 301, swing frame 302, hydraulic cylinder 305, cover 306, push rod 307.

[0031] Wind-powered fire suppression unit 400, fan 401, air outlet duct 4011, high-speed drive motor 4012, blades 4013, nozzles 4014.

[0032] Horizontal swing device 402, worm gear 4021, horizontal rotating frame 4022, support rod 4023.

[0033] Up-and-down swing device 403, electric push rod 4031.

[0034] 500 fire monitors

[0035] Base 501, compressed air passage 5011, transition interface section 5012,

[0036] Gun body 502, vertical tube 5021, horizontal tube 5022, bearing 5023, sealing ring 5024, extinguishing agent channel inlet 5025, transition section 5026.

[0037] cannon horizontal drive device 503, worm wheel three 5031, worm three 5032, nozzle 504, nozzle up and down swing device 505,

[0038] surface spraying device 600, rear nozzle 601,

[0039] unmanned aerial vehicle fire extinguishing unit 700, fire extinguishing agent extension pipe 701, compressed air extension pipe 702, spray gun 703;

[0040] driver's cabin cooling device 800, front nozzle 801, driver's cabin 802. DETAILED DESCRIPTION

[0041] The specific embodiments of the utility model will be further described below according to the drawings: EMBODIMENT

[0042] Referring to Figure 1 、 2 The multifunctional fire extinguishing vehicle shown in the drawing comprises a caterpillar chassis 200 with a power mechanism and capable of walking, a road obstacle removing unit 300 is arranged at the front of the chassis, a fire extinguishing unit is arranged above the chassis, the fire extinguishing unit comprises a wind power fire extinguishing unit 400, a fire monitor 500, a surface spraying device 600 and the like. The driver's cabin 802 is arranged above the front part of the chassis, and the driver's cabin cooling device 800 is arranged at the front part of the driver's cabin. The wind power fire extinguishing unit 400 is arranged above the rack 202 fixed to the chassis 201, the fire monitor 500 is arranged above the driver's cabin 802, and the surface spraying device 600 is arranged at the rear part of the chassis. The multifunctional fire extinguishing vehicle is further provided with the unmanned aerial vehicle fire extinguishing unit 700.

[0043] The road obstacle removing unit 300 comprises a swing frame 302 rotatably arranged at the front of the chassis through a pivot 301, an obstacle removing roller rotatably arranged at the front part of the swing frame, cutting teeth fixedly arranged in a spiral shape on the outer periphery of the obstacle removing roller, a hydraulic motor fixed to the swing frame and driving the obstacle removing roller to rotate, and a hydraulic oil cylinder 305 driving the swing frame to swing up and down relative to the chassis about the pivot 301. A cover 306 is arranged on the upper part of the obstacle removing roller, and the rear end of the cover is hingedly connected to the swing frame. A push rod (such as an electric push rod) 307 driving the cover to swing relative to the swing frame is arranged between the swing frame and the cover.

[0044] The wind power fire extinguishing unit 400 comprises a fan 401, a horizontal swing device 402 driving the fan to horizontally swing relative to the chassis, and an up and down swing device 403 driving the fan to swing up and down relative to the chassis.

[0045] The fan is an axial fan. The fan 401 has a blade 4013 rotating around the axis of the outlet tube under the drive of a high-speed driving motor 4012, i.e. the fan power device. The rotating blade makes the airflow enter from the rear end of the outlet tube and be sprayed from the front end. The nozzle 4014 is located at the front end of the outlet tube.

[0046] Referring to Figures 3-6 The horizontal swing device 402 includes a worm 4021 rotatingly arranged on the frame, a worm wheel fixed on the horizontal carrier and cooperating with the worm, a horizontal swing power device, i.e. the worm driving motor, driving the worm to rotate, the horizontal carrier 4022 rotating around the vertical axis relative to the frame, and a pair of support rods 4023 fixed on the horizontal carrier 4022.

[0047] The two sides of the outlet tube 4011 are hingedly connected to the ends of the two opposite support rods 4023 through rotating shafts extending along the radial direction of the outlet tube;

[0048] The up-and-down swing device 403 includes an electric push rod 4031, which includes a push rod base hingedly connected to one of the support rods 4023 and a push rod telescopically connected to the push rod base and hingedly connected to the outlet tube 4011.

[0049] The up-and-down swing device drives the outlet tube to swing up and down around the rotating shaft. When the fan is working, the high-speed airflow generated by the fan is blown out through the outlet tube. At the same time, the horizontal swing device and the up-and-down swing device work, the high-speed airflow realizes horizontal and up-and-down scanning of the fire source, and the fire source is cooled to achieve fire extinguishing.

[0050] The fire extinguishing agent tank, which has fire extinguishing agent (e.g. water) inside, is located on the chassis. The liquid inlet of the fire extinguishing agent pumping device (e.g. a water pump or other liquid pump) 101 extends into the fire extinguishing agent tank, and the liquid outlet of the fire extinguishing agent pumping device is divided into five parallel outlet branches. The nozzle 4014 located at the front end of the outlet tube 4011 is connected to the first outlet branch of the fire extinguishing agent pumping device 101 through a fire extinguishing agent delivery pipe.

[0051] The fire extinguishing agent pumping device is used to deliver the fire extinguishing agent in the fire extinguishing agent tank to the nozzle through the first outlet branch; the fire extinguishing agent sprayed from the nozzle is atomized by the airflow and sprayed to the fire source along with the airflow.

[0052] The cab cooling device 800 includes a front nozzle 801. The cab 802 is located above the front part of the chassis. The front nozzle 801 for spraying mist or water to cool the cab is arranged outside the cab. The front nozzle 801 is connected to the second outlet branch of the fire extinguishing agent pumping device through a water delivery pipe. When the fire extinguishing agent in the fire extinguishing agent tank is water, the fire extinguishing agent pumping device pumps the water to the front nozzle 801 through the second outlet branch, which is mainly used to cool the front windshield and other parts of the cab.

[0053] Referring toFigures 12-14 The fire monitor 500 is a dual-purpose fire monitor capable of spraying both water and foam, comprising a base 501 fixed on the top of the acceleration pedestal, a monitor body 502 rotating in a horizontal plane relative to the base, a horizontal drive device 503 driving the monitor body to rotate horizontally relative to the base, a spray pipe 504 oscillating in a vertical plane relative to the monitor body, and an up-down oscillating device 505 driving the spray pipe to oscillate up and down relative to the monitor body.

[0054] The monitor body 502 comprises a vertical pipe 5021 and a horizontal pipe 5022 fixedly connected. The base 501 has a compressed air passage 5011 communicating with a compressed air source, and the outlet of the compressed air passage 5011 is fixed with a transition interface section 5012 (which can be regarded as a part of the compressed air passage 5011). The lower section of the vertical pipe 5021 is rotatably arranged in the transition interface section 5012 through a bearing 5023 on the outer periphery of the lower section, and the outer periphery of the lower section is sealed with the inner periphery of the transition interface section 5012 through a sealing ring 5024. The horizontal drive device 503 comprises a worm gear three 5031 arranged on the outer periphery of the lower section of the vertical pipe, a worm shaft three 5032 rotatably arranged on the transition interface section 5012 and matched with the worm gear three, and a motor three driving the worm shaft three to rotate.

[0055] The horizontal pipe 5022 as a fire extinguishing agent passage has a fire extinguishing agent passage inlet 5025 opened on the pipe wall, and the outlet of the horizontal pipe is fixed with a transition section 5026 (which can be regarded as a part of the horizontal pipe).

[0056] The spray pipe 504 is a 90° elbow pipe. The inlet section of the spray pipe is rotatably arranged in the transition section 5026 through a bearing on the outer periphery of the inlet section, and the outer periphery of the inlet section is sealed with the inner periphery of the transition section 5026 through a sealing ring. The up-down oscillating device of the spray pipe is similar to the horizontal drive device of the monitor body, comprising a worm gear two arranged on the outer periphery of the inlet section of the spray pipe, a worm shaft two rotatably arranged on the outlet section of the horizontal pipe and matched with the worm gear two, and a motor two driving the worm shaft two to rotate. When the motor two operates, the worm shaft two rotates, driving the worm gear two and the inlet section of the spray pipe to rotate around the axis of the outlet section of the horizontal pipe, thereby realizing the up-down oscillation of the spray pipe.

[0057] The compressed air passage, the vertical pipe, and the horizontal pipe are sequentially communicated. The fire extinguishing agent passage inlet 5025 is communicated with a third outlet branch of a fire extinguishing agent pumping device through a pipeline, and the fire extinguishing agent pumping device pumps the fire extinguishing agent in a fire extinguishing agent tank to the fire monitor through the third outlet branch and is sprayed out through the spray pipe. When the fire extinguishing agent is a fire extinguishing agent containing a foaming agent, compressed air is intermittently sent to the fire extinguishing agent passage through the compressed air passage in a pulse manner, so that the fire extinguishing agent is sprayed out of the spray pipe in a foamed state.

[0058] The compressed air source is a piston air compressor 102 without an air tank. The air outlet of the piston air compressor valve is divided into two parallel branches. One air outlet branch is connected to the compressed air passage on the base, and the other air outlet branch is reserved and can be connected to one end of the compressed air extension pipe.

[0059] See Figure 1 , 2 The drone firefighting unit 700 includes a drone, a flexible extinguishing agent extension pipe 701, a flexible compressed air extension pipe 702, and a spray gun 703. The spray gun mounted on the drone has two parallel inlets. One inlet is detachably connected to the fourth outlet branch of the extinguishing agent pumping device via the extinguishing agent extension pipe, and the other inlet is detachably connected to the compressed air extension pipe. The drone propels the spray gun close to the fire source, spraying extinguishing agent to extinguish the fire. When the extinguishing agent contains a foaming agent, compressed air is intermittently pulsed into the spray gun via the compressed air extension pipe, causing the extinguishing agent to form a foamy spray that exits the spray gun.

[0060] The surface sprinkler system 600 includes multiple rear nozzles 601 located at the rear of the chassis. The rear nozzles are connected to the fifth outlet branch of the extinguishing agent pumping device via water delivery pipes. When the extinguishing agent in the extinguishing agent tank is water, the extinguishing agent pumping device pumps water to the rear nozzles 601 through the fifth outlet branch. This is mainly used to cool and extinguish the remaining fire at the rear of the chassis and prevent reignition.

[0061] See Figures 7-11 The tracked chassis 200 includes tracks, a frame 202, drive wheels 203 that rotate under the drive of a power unit mounted on the chassis to drive the tracks, tension wheels 204 mounted on the chassis to tension the tracks, support rollers 205 mounted on the upper side of the chassis to support the upper section of the tracks, load-bearing rollers 206 that contact the lower section of the tracks, a torsion bar 207, an angled wheel frame 208, and a reset device 209. The tracks, chassis, drive wheels, power unit, tension wheels, and support rollers are prior art and will not be described in detail.

[0062] The torsion bar 207 includes an upper horizontal shaft 2071, a lower horizontal shaft 2072, and a connecting rod 2073; the upper and lower horizontal shafts are parallel to each other, and the two ends of the connecting rod are fixedly connected to the upper and lower horizontal shafts respectively. The angular wheel frame 208 has a front rod 2081 and a rear rod 2082 fixedly connected at an angle, with an angle α between them, 60°≤α≤120°. Two pairs of load-bearing wheels are rotatably mounted on each angular wheel frame 208. The lower end of the front rod is fixed to the front axle, and the two front load-bearing wheels are rotatably mounted on the front axle. The lower end of the rear rod is fixed to the rear axle, and the two rear load-bearing wheels are rotatably mounted on the rear axle. The front axle, rear axle, upper horizontal shaft, and lower horizontal shaft are parallel to each other.

[0063] The angle point of each angle wheel frame 208 is rotatably connected with the lower horizontal shaft 2072 of a torsion bar through a bearing seat 2083, and the upper horizontal shaft 2071 extends along the chassis transversely and passes through the damping shell 2091 fixed on the side of the chassis and is hinged on the side of the chassis.

[0064] Referring to Figure 10 As shown, the torsion bar (or the upper horizontal shaft 2071) is in an initial position before a torque is applied thereto, and when a torque is applied to the torsion bar (or the upper horizontal shaft 2071) so that the upper horizontal shaft 2071 rotates clockwise around the horizontal shaft axis, the damping wheel 2093 and the upper horizontal shaft 2071 rotate clockwise together, and the damping wheel 2093 causes the elastic damping column 2092 to be elastically deformed and become an ellipse, and the resistance to the rotation of the upper horizontal shaft 2071 increases with the rotation angle.

[0065] There are fundamental problems such as lack of water source and inability to timely deliver a large amount of fire-fighting water in fire extinguishing of forest grassland and the like, and the water tank of a fire truck also has a limited water carrying capacity.

[0066] The horizontal swinging device for swinging the fan horizontally and the up-down swinging device for swinging the fan up and down have various structures, and an electric push rod and a worm gear structure are adopted, so that the structure is further simplified, and the horizontal swinging and up-down swinging of the fan are more rapid, convenient and flexible.

[0067] The axial flow fan is adopted, so that the air volume is larger and the fire extinguishing effect is better.

[0068] The extinguishing agent in the extinguishing agent tank is pumped by the liquid pump through the extinguishing agent delivery pipe to the nozzle located in the air outlet tube of the fan. The extinguishing agent sprayed by the nozzle is atomized by the high-speed airflow and sprayed to the fire source along with the high-speed airflow to assist the wind extinguishing and achieve rapid cooling and extinguishing of the fire source. The extinguishing agent can be water or other chemical agents. When the extinguishing agent is water, the fire extinguishing vehicle is a wind-water extinguishing vehicle. The extinguishing agent delivery pipe is preferably a flexible pipe to adapt to the horizontal and vertical swinging of the fan.

[0069] The road obstacle clearing unit is located at the front end of the chassis. The hydraulic motor drives the clearing roller to rotate, and the cutting teeth cut the obstacles to clear and crush the obstacles such as shrubs encountered on the road in a timely manner. The hydraulic cylinder drives the swing frame and the clearing roller to swing up and down at the front end of the combat vehicle, which can clear and crush tall trees and other obstacles. The clearing and crushing of obstacles such as shrubs and tall trees allows the chassis to move smoothly, and also has the effect of isolating the fire source and preventing the spread of the fire. In addition, the road obstacle clearing unit can also be swung to a state where the cutting teeth are in contact with the ground. Under the drive of the rotating clearing roller, the cutting teeth turn up the soil and sand on the ground and throw them forward to cover the fire source and effectively extinguish the fire. The fire extinguishing vehicle can be said to be a multifunctional fire extinguishing vehicle.

[0070] The clearing roller is installed inside and below the protective cover. The entire cover or a part of the front cover of the cover is movable. When encountering thick trees, the push rod (such as an electric push rod) drives the entire cover or the movable cover to swing upward and backward, opening the entire cover or the movable cover to prevent the front end of the cover or the movable cover from colliding with the obstacles, so that the cutting teeth on the clearing roller can directly contact the obstacles and perform the obstacle clearing operation.

[0071] In order to prevent the temperature in the cab from being too high when it is close to the fire source, the front nozzle sprays water or mist to cool the cab.

[0072] The fire monitor has the characteristics of large flow and long range. The horizontal driving device of the cannon body and the up-down swinging device of the nozzle drive the nozzle to rotate horizontally and swing up and down, so that the nozzle can be adjusted to different states to spray the extinguishing agent to the fire source. The extinguishing agent can be water, foam, or extinguishing agent with foaming agent, etc. When the water source is insufficient, foam extinguishing can be used first. The foam is sprayed by the fire monitor (fire foam monitor or dual-purpose fire monitor) to cover the fire source, which is water-saving and has good extinguishing effect.

[0073] In order to make the fire monitor spray the foam more effectively or spray different foam, compressed air can be sent into the spray pipe in pulse mode through the compressed air pipe, and the pulse frequency (the number of times of sending compressed air into the spray pipe per unit time) can be controlled to generate different foam. Since the compressed air generated by the up-and-down movement of the piston in the piston air compressor is pulsed, the air outlet of the air valve of the piston air compressor can be directly connected with the compressed air pipe in communication, so that the structure is more simple, and a separate electromagnetic valve is not needed on the compressed air pipe to generate pulsed air flow.

[0074] The front fire monitor arranged above the front part of the chassis can extinguish the fire source far in front of the fire extinguishing vehicle.

[0075] The rear nozzle arranged at the rear part of the chassis sprays mist or water under the action of the water pump to extinguish the fire source behind the fire extinguishing vehicle again, especially the residual fire source, and effectively prevent the fire from rekindling.

[0076] The outer periphery of the spray pipe inlet section is rotatably arranged in the horizontal pipe outlet section through a bearing, and the outer periphery of the spray pipe inlet section is sealed with the inner periphery of the horizontal pipe outlet section through a sealing ring, so that the sealed communication between the spray pipe and the horizontal pipe is ensured, and the rotating resistance of the spray pipe relative to the horizontal pipe is small.

[0077] The outer periphery of the lower section of the vertical pipe is rotatably arranged in the compressed air passage outlet section through a bearing, and the outer periphery of the lower section of the vertical pipe is sealed with the inner periphery of the compressed air passage outlet section through a sealing ring, so that the sealed communication between the vertical pipe and the compressed air passage is ensured, and the rotating resistance of the vertical pipe relative to the compressed air passage is small.

[0078] The flame detector can timely and accurately find the fire source. After the flame detector finds the fire source, the horizontal driving device of the monitor body and the up-and-down swinging device of the spray pipe stop working, the spray pipe is aimed at the flame, and then the fire monitor sprays the extinguishing agent on the flame to quickly extinguish the fire.

[0079] The unmanned aerial vehicle drives the spray gun and flexible extension pipes (including extinguishing agent extension pipes and compressed air extension pipes) to approach the fire source, and sprays the extinguishing agent on the fire source to extinguish the fire, so that the fire source in an area that the fire extinguishing vehicle cannot reach, such as a steep cliff, can be effectively extinguished.

[0080] The fire monitor, the fan and the road obstacle removing unit are organically integrated together, different modes can be comprehensively adopted for extinguishing fire according to specific fire conditions and fire site conditions, and the fire can be extinguished more timely and effectively.

[0081] The protection scope of the utility model includes but is not limited to the above-mentioned embodiments, the protection scope of the utility model is subject to the claims, and any replacement, deformation and improvement of the technology that can be easily thought of by the person skilled in the art falls within the protection scope of the utility model.

Claims

1. A tracked chassis for a multi-functional fire truck, comprising a track, a drive wheel rotating under the drive of a power unit mounted on the chassis for driving the track, a tensioning wheel mounted on the chassis for tensioning the track, a support roller mounted on the upper side of the chassis for supporting the upper section of the track, and a load-bearing roller mounted on the lower side of the chassis and in contact with the lower section of the track; characterized in that: The load-bearing wheels are in several pairs. The front and rear load-bearing wheels in each pair are hinged together to the front and rear ends of an angled wheel frame. The upper corner of the middle of the angled wheel frame is hinged to the chassis.

2. The tracked chassis according to claim 1, characterized in that: It also includes multiple torsion bars, with the corner of each angular wheel frame hinged to the lower end of a torsion bar, and the upper end of the torsion bar hinged to the lower side of the chassis; a reset device is provided between the torsion bar and the chassis, which keeps the torsion bar in a balanced position relative to the chassis; when the torsion bar leaves the balanced position, the reset device applies a force to the torsion bar to restore it to the balanced position.

3. The tracked chassis according to claim 2, characterized in that: The torsion bar includes an upper horizontal shaft, a lower horizontal shaft, and a connecting rod; the upper and lower horizontal shafts are parallel to each other, and the two ends of the connecting rod are fixedly connected to the upper and lower horizontal shafts respectively; the upper horizontal shaft extends laterally along the chassis and is hinged to the side of the chassis; the lower horizontal shaft is hinged to the corner of the angled wheel frame through a bearing seat.

4. The tracked chassis according to claim 3, characterized in that: The reset device includes a damping shell with an inner angle, an elastic damping column located at the inner angle of the damping shell, and a damping wheel fixed to the upper horizontal axis in the circumferential direction. The damping wheel has a concave surface in the circumferential direction, and the concave surface contacts the outer circumferential surface of the elastic damping column.

5. The tracked chassis according to claim 3, characterized in that: The angular wheel frame has a front rod and a rear rod that are fixedly connected at an angle. The lower end of the front rod is fixed to the front wheel axle, and two front load-bearing wheels are rotatably mounted on the front wheel axle. The lower end of the rear rod is fixed to the rear wheel axle, and two rear load-bearing wheels are rotatably mounted on the rear wheel axle. The front wheel axle, the rear wheel axle, the upper cross shaft, and the lower cross shaft are parallel to each other.

6. The tracked chassis according to claim 5, characterized in that: The angle between the front and rear poles is α, where 60° ≤ α ≤ 120°.

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