Fire fighting truck rear bumper device with obstacle crossing function

Abstract

The invention discloses a fire fighting truck rear bumper device with an obstacle crossing function, and belongs to the technical field of vehicle tail safety devices. The fire fighting truck comprises a chassis girder connecting cross beam fixed between the opposite sides of the ends, facing the tail of the truck, of a pair of longitudinally-parallel frame chassis girders, and the rear bumper device with the obstacle crossing function comprises a left cantilever connecting frame, a right cantilever connecting frame, a left cantilever, a right cantilever and a rear bumper. The device is characterized in that a left cantilever automatic locking and unlocking mechanism is arranged between the front end of the left cantilever connecting frame and the upper end of the left cantilever, and a right cantilever automatic locking and unlocking mechanism is arranged between the front end of the right cantilever connecting frame and the upper end of the right cantilever. The rear-end collision prevention device has the advantages that the rear-end collision prevention device has the safety protection functions of normally absorbing and buffering external impact force when rear-end collision is caused by rear vehicles and preventing a rear-end collision car from entering the bottom of the car; therefore, the rear bumper automatically crosses the obstacle, and rapid passing of the vehicle is prevented from being delayed.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle rear safety devices, and in particular relates to a fire truck rear bumper device with an obstacle crossing function. Background Art

[0002] The function of the rear bumper of a fire truck is basically the same as that of various trucks, vans, container trucks, etc. Specifically, it mainly absorbs and mitigates external impact, protects the safety of the vehicle body, avoids rear-end collisions, especially prevents cars from drilling into the bottom of large vehicles when rear-end collisions occur, so as to avoid fatal injuries. It has a positive significance for protecting the lives of small cars and their passengers. In addition, for fire-fighting and rescue fire trucks, giving them obstacle-crossing functions can buy precious time for disaster relief, because if they take detours to avoid obstacles or delay time to clear obstacles, then there is no doubt that the opportunity to invest in disaster relief will be delayed.

[0003] There is no lack of technical information related to vehicle bumpers in the public Chinese patent documents, such as CN203611908U (adjustable rear bumper device for trucks), CN205524103U (bionic rear bumper for heavy-duty vehicles) and CN1775594A (rear bumper device for trucks), etc. The vehicle rear bumper devices in the above-mentioned prior art are not limited to the functions of absorbing and mitigating external impact forces and preventing cars from drilling into the bottom of the car when rear-end collisions occur. Although CN203611908U and CN1775594A have the function of adjusting the height position of the rear bumper up and down as needed, they do not have other functions except for the above-mentioned functions of absorbing and mitigating external impact forces and preventing cars from drilling into the bottom of the car when rear-end collisions occur. A typical example of the other functions mentioned here is that in certain special sections of the road, rocks rolled down due to landslides or heavy goods (objects) rolled down from other vehicles are on the road surface where vehicles are passing. Then the aforementioned rolled rocks or heavy goods rolled down from other vehicles undoubtedly constitute obstacles that affect the passage of vehicles, and if the obstacles cannot be removed by human ability, changing the route will delay time. For the aforementioned fire-fighting and rescue fire trucks that involve the safety of life and property every second, it is very likely that the losses at the fire scene will be further expanded due to the loss of the best opportunity. If waiting for other vehicles to come and remove the obstacles, the aforementioned problem of losing the best time for disaster relief will also arise.

[0004] Based on the above, it is of positive significance to design a rear bumper device for other types of trucks, heavy vehicles, etc. including fire trucks, which has the function of crossing obstacles in addition to the conventional functions of alleviating external impact force and preventing small cars from rear-ending and drilling under the vehicle. The technical solution to be introduced below is produced in this context. Summary of the invention

[0005] The task of the present invention is to provide a fire truck rear bumper device with obstacle crossing function which can automatically cross obstacles on the road to avoid delaying the rescue time.

[0006] The task of the present invention is accomplished in this way. A rear bumper device of a fire truck with an obstacle-crossing function, the fire truck comprising a chassis beam connecting crossbeam fixed between opposite sides of one end of a pair of longitudinally parallel frame chassis beams toward the rear of the vehicle, the rear bumper device with the obstacle-crossing function comprises a left cantilever connecting frame, a right cantilever connecting frame, a left cantilever, a right cantilever and a rear bumper, the right side of the rear end of the left cantilever connecting frame is fixed to the left side surface of the chassis beam connecting crossbeam, the left side of the rear end of the right cantilever connecting frame is fixed to the right side surface of the chassis beam connecting crossbeam, the front ends of the left and right cantilever connecting frames respectively protrude out of the front side surface of the chassis beam connecting crossbeam, and correspond to each other left and right, the upper end of the left cantilever is connected to the front end of the left cantilever connecting frame, and the lower end of the left cantilever extends downward and constitutes the left connecting end of the rear bumper, the right cantilever corresponds to the left cantilever, the upper end of the right cantilever is connected to the front end of the right cantilever connecting frame, and the lower end of the right cantilever The rear bumper is connected to the left and right connecting ends of the rear bumper, and the left end of the rear bumper extends to the left side of the left connecting end of the rear bumper, and the right end extends to the right side of the right connecting end of the rear bumper; the characteristic is that a left cantilever automatic locking and unlocking mechanism is arranged between the front end of the left cantilever connecting frame and the upper end of the left cantilever, and a right cantilever automatic locking and unlocking mechanism is arranged between the front end of the right cantilever connecting frame and the upper end of the right cantilever; when the upper ends of the left and right cantilevers are respectively in a state of being engaged with the left and right cantilever automatic locking and unlocking mechanisms, the rear bumper is in a non-obstacle crossing state, and when the upper ends of the left and right cantilevers are respectively in a state of being disengaged from the left and right cantilever automatic locking and unlocking mechanisms, the lower ends of the left and right cantilevers together with the rear bumper are flipped in a counterclockwise direction to make the rear bumper in an obstacle crossing state.

[0007] In a specific embodiment of the present invention, the left cantilever connecting frame is composed of a left cantilever connecting frame top plate, a left cantilever connecting frame left side plate and a left cantilever connecting frame right side plate, the left cantilever connecting frame left side plate and the left cantilever connecting frame right side plate are respectively formed by symmetrically bending downwards on the left and right sides of the length direction of the left cantilever connecting frame top plate, the left and right sides of the left cantilever connecting frame are parallel to each other, and the right side of the rear end of the right side plate of the left cantilever connecting frame is fixed to the left side surface of the chassis beam connecting crossbeam, and the front ends of the left and right sides of the left cantilever connecting frame protrude out of the front side surface of the chassis beam connecting crossbeam, and the left cantilever connecting frame top plate, the left cantilever connecting frame left side plate and the left cantilever connecting frame right side plate together form a left cantilever connecting back cavity with a U-shaped cross section; the upper end of the left cantilever is pivotally connected between the front ends of the left and right sides of the left cantilever connecting frame at a position corresponding to the front end of the left cantilever connecting frame cavity; the right cantilever connecting frame is composed of the right cantilever connecting frame top plate, the right cantilever connecting frame left side plate and the right cantilever connecting frame The right side plate of the frame is composed of the left side plate of the right cantilever connecting frame and the right side plate of the right cantilever connecting frame, respectively, which are symmetrically bent downward on the left and right sides in the length direction of the right cantilever connecting frame top plate, and the left and right side plates of the right cantilever connecting frame are parallel to each other, and the left side of the rear end of the left side plate of the right cantilever connecting frame is fixed to the right side surface of the chassis beam connecting crossbeam, and the front ends of the left and right side plates of the right cantilever connecting frame protrude out of the front side surface of the chassis beam connecting crossbeam, and the right cantilever connecting frame top plate, the left side plate of the right cantilever connecting frame and the right side plate of the right cantilever connecting frame together form a right cantilever connecting frame cavity with a cross-sectional shape of a "ㄇ" shape; the upper end of the right cantilever is pivotally connected between the front ends of the left and right side plates of the right cantilever connecting frame at a position corresponding to the front end of the right cantilever connecting frame cavity; the left cantilever automatic locking and unlocking mechanism is arranged between the front end of the left cantilever connecting frame cavity and the rear side of the upper end of the left cantilever; the right cantilever automatic locking and unlocking mechanism is arranged between the front end of the right cantilever connecting frame cavity and the rear side of the upper end of the right cantilever.

[0008] In another specific embodiment of the present invention, a left cantilever upper end baffle is fixed in the left cantilever connecting frame cavity and at the front end of the left cantilever connecting frame cavity, and a left cantilever upper end buffer pad is fixed on the front side of the left cantilever upper end baffle, the upper end of the left cantilever is in contact with the left cantilever upper end buffer pad at a position corresponding to the left cantilever upper end buffer pad, and the upper end of the left cantilever is pivotally connected between the front ends of the left and right side plates of the left cantilever connecting frame at a position corresponding to the front of the left cantilever upper end buffer pad; the left cantilever automatic locking and unlocking mechanism is arranged at the lower rear side corresponding to the left cantilever upper end baffle and the left cantilever a right cantilever upper end baffle is fixed in the right cantilever connecting frame cavity and at the front end of the right cantilever connecting frame cavity, a right cantilever upper end buffer pad is fixed on the front side surface of the right cantilever upper end baffle, the upper end of the right cantilever is in contact with the right cantilever upper end buffer pad at a position corresponding to the right cantilever upper end buffer pad, and the upper end of the right cantilever is pivotally connected between the front ends of the left and right side plates of the right cantilever connecting frame at a position corresponding to the front of the right cantilever upper end buffer pad; the right cantilever automatic locking and unlocking mechanism is arranged between the lower rear side corresponding to the right cantilever upper end baffle and the upper rear side of the right cantilever.

[0009] In another specific embodiment of the present invention, a left cantilever upper end left supporting shaft head hole is provided on the left side plate of the left cantilever connecting frame and in front of the left cantilever upper end baffle, and a left cantilever upper end right supporting shaft head hole corresponding to the left cantilever upper end left supporting shaft head hole is provided on the right side plate of the left cantilever connecting frame and also in front of the left cantilever upper end baffle; a right cantilever upper end left supporting shaft head hole is provided on the left side plate of the right cantilever connecting frame and in front of the right cantilever upper end baffle, and a right cantilever upper end left supporting shaft head hole is provided on the right side plate of the right cantilever connecting frame and also in front of the right cantilever upper end baffle. A right supporting shaft head hole at the upper end of the right cantilever is opened at a position corresponding to the left supporting shaft head hole at the upper end of the right cantilever; the upper end of the left cantilever is pivotally connected between the front ends of the left and right side plates of the left cantilever connecting frame at a position corresponding to the left supporting shaft head hole at the upper end of the left cantilever and the right supporting shaft head hole at the upper end of the left cantilever, and corresponds to the front end of the left cantilever connecting frame cavity at the same time; the upper end of the right cantilever is pivotally connected between the front ends of the left and right side plates of the right cantilever connecting frame at a position corresponding to the left supporting shaft head hole at the upper end of the right cantilever and the right supporting shaft head hole at the upper end of the right cantilever, and corresponds to the front end of the right cantilever connecting frame cavity at the same time.

[0010] In another specific embodiment of the present invention, a left cantilever pivot support shaft sleeve is provided at the upper end of the left cantilever, the left end of the left cantilever pivot support shaft sleeve protrudes out of the left side surface of the upper end of the left cantilever, and the right end protrudes out of the right side surface of the upper end of the left cantilever, and a left cantilever shaft sleeve pivot support shaft is inserted in the left cantilever pivot support shaft sleeve, the left end of the left cantilever shaft sleeve pivot support shaft is inserted into the left support shaft head hole at the upper end of the left cantilever and extends to the left side of the left side plate of the left cantilever connecting frame, and the right end of the left cantilever shaft sleeve pivot support shaft is inserted into The right supporting shaft head hole at the upper end of the left cantilever; a right cantilever pivot supporting shaft sleeve is arranged at the upper end of the right cantilever, the left end of the right cantilever pivot supporting shaft sleeve protrudes out of the left side surface of the upper end of the right cantilever, and the right end protrudes out of the right side surface of the upper end of the right cantilever, and a right cantilever shaft sleeve pivot supporting shaft is inserted in the right cantilever pivot supporting shaft sleeve, the left end of the right cantilever shaft sleeve pivot supporting shaft is inserted into the left supporting shaft head hole at the upper end of the right cantilever, and the right end is inserted into the right supporting shaft head hole at the upper end of the right cantilever and extends to the right side of the right side plate of the right cantilever connecting frame.

[0011] In another specific embodiment of the present invention, a left limit plate slot is provided on the left end surface of the left cantilever shaft sleeve pivot support shaft, and a left limit plate for preventing the left cantilever shaft sleeve pivot support shaft from moving is inserted at a position corresponding to the left limit plate slot, and the front end and rear end of the left limit plate are each fixed to the left side surface of the left side plate of the left cantilever connecting frame by a left limit plate fixing screw; a right limit plate slot is provided on the right end surface of the right cantilever shaft sleeve pivot support shaft, and a right limit plate for preventing the right cantilever shaft sleeve pivot support shaft from moving is inserted at a position corresponding to the right limit plate slot, and the front end and rear end of the right limit plate are each fixed to the right side surface of the left side plate of the right cantilever connecting frame by a right limit plate fixing screw.

[0012] In a more specific embodiment of the present invention, the structure of the right cantilever automatic locking and unlocking mechanism is the same as the structure of the left cantilever automatic locking and unlocking mechanism, and the left cantilever automatic locking and unlocking mechanism includes a left cantilever connecting plate, a left cantilever locking flange matching plate and a locking block, and the left cantilever connecting plate is arranged in the left cantilever connecting frame cavity at a position corresponding to the rear of the left cantilever upper end baffle and is located at the lower part of the left cantilever connecting frame cavity, and the left cantilever connecting plate is respectively formed with a left cantilever connecting plate folding plate folded backward and perpendicular to the left cantilever connecting plate at the left end of the left cantilever connecting plate and the left cantilever connecting plate folding plate at the right end of the left cantilever connecting plate are respectively fixed to the lower part of the opposite side of the left and right side plates of the left cantilever connecting frame by the left cantilever connecting plate folding plate fixing screws, and the left end and the right end of the left cantilever locking flange matching plate are respectively The left cantilever locking flange mating plate fixing screw is fixed to the front lower part of the left cantilever connecting plate by the left cantilever locking flange matching plate fixing screw, and a pair of locking block flange limiting seats are formed in the middle part of the front side surface of the left cantilever locking flange matching plate, and the space between the pair of locking block flange limiting seats is formed as a locking block flange insertion cavity, and a semicircular ball head is respectively formed at the central position of the surface of the opposite side of the pair of locking block flange limiting seats, and the locking block is fixed to the upper end rear side of the left cantilever by the locking block fixing screw at the position corresponding to the locking block flange insertion cavity, and a locking block flange protruding from the rear side surface of the locking block is formed at the rear side of the locking block and at the position corresponding to the locking block flange insertion cavity, when the locking block flange is in a state of being embedded with the locking block flange insertion cavity, the rear bumper is in a non-obstacle crossing state, and when the locking block flange is in a state of being out of the locking block flange insertion cavity, the rear bumper is in an automatic obstacle crossing state.

[0013] In a further specific embodiment of the present invention, a left cantilever rear bumper mounting plate is fixed to the front side of the left connecting end of the rear bumper, a right cantilever rear bumper mounting plate is fixed to the front side of the right connecting end of the rear bumper, and the middle portion of the rear bumper is fixed to the left and right cantilever rear bumper mounting plates by rear bumper fixing screws.

[0014] In yet another specific embodiment of the present invention, the rear bumper is formed by extruding aluminum extrusion material with the aid of an aluminum extrusion die.

[0015] In yet another specific embodiment of the present invention, anti-skid convex strips are spaced apart on the upper surface of the rear bumper in the longitudinal direction.

[0016] The technical effect of the technical solution provided by the present invention is that: when the fire truck is in a normal driving state, the upper ends of the left and right cantilevers are respectively in an engaged locking state with the automatic locking and unlocking mechanisms of the left and right cantilevers, and the rear bumper is also in a horizontal state, which can play a normal safety protection role of absorbing and alleviating external impact force when being rear-ended by a rear vehicle and preventing the rear-end car from penetrating under the vehicle; when the fire truck encounters an obstacle on the road, the upper ends of the left and right cantilevers can be respectively separated from the automatic locking and unlocking mechanisms of the left and right cantilevers to release the locking state, and the lower ends of the left and right cantilevers together with the rear bumper automatically flip in the counterclockwise direction to the required angle so that the rear bumper automatically passes over the obstacle, thereby avoiding delaying the rapid passage of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of part A; Figure 3 is a schematic diagram of the present invention in a non-obstacle crossing state; Figure 4 It is a schematic diagram of the present invention in an obstacle crossing state. DETAILED DESCRIPTION

[0018] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description in the form of embodiments below. However, the description of the embodiments is not a limitation of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical solution of the present invention.

[0019] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on Figure 1 The current position state is used as a reference, and thus it cannot be understood as a special limitation on the technical solution provided by the present invention.

[0020] See also Figure 1, showing a chassis beam connecting crossbeam 1 of the structural system of a fire truck and fixed between the opposite sides of one end of a pair of longitudinally parallel frame chassis beams toward the rear of the vehicle, showing a left cantilever connecting frame 2, a right cantilever connecting frame 3, a left cantilever 4, a right cantilever 5 and a rear bumper 6 of the structural system of the rear bumper device of the fire truck with obstacle crossing function, the right side of the rear end of the left cantilever connecting frame 2 is welded and fixed to the left side surface of the aforementioned chassis beam connecting crossbeam 1, the left side of the rear end of the right cantilever connecting frame 3 is welded and fixed to the right side surface of the chassis beam connecting crossbeam 1, and the front ends of the left and right cantilever connecting frames 2 and 3 each protrude out of the chassis beam connecting crossbeam 1, and correspond to each other left and right, the upper end of the left cantilever 4 is connected to the front end of the left cantilever connecting frame 2, and the lower end of the left cantilever 4 extends downward and constitutes a rear bumper left connecting end 41, the right cantilever 5 corresponds to the left cantilever 4, the upper end of the right cantilever 5 is connected to the front end of the right cantilever connecting frame 3, and the lower end of the right cantilever 5 extends downward and constitutes a rear bumper right connecting end 51, the middle part of the rear bumper 6 is connected to the rear bumper left connecting end 41 and the rear bumper right connecting end 51, and the left end of the rear bumper 6 extends leftward to the left side of the rear bumper left connecting end 41, and the right end extends rightward to the right side of the rear bumper right connecting end 51.

[0021] As the technical key points of the technical solution provided by the present invention, a left cantilever automatic locking and unlocking mechanism 7 is arranged between the front end of the aforementioned left cantilever connecting frame 2 and the upper end of the aforementioned left cantilever 4, and a right cantilever automatic locking and unlocking mechanism 8 is arranged between the front end of the aforementioned right cantilever connecting frame 3 and the upper end of the aforementioned right cantilever 5; when the upper ends of the aforementioned left and right cantilevers 4 and 5 are respectively in a state of being engaged with the aforementioned left and right cantilever automatic locking and unlocking mechanisms 7 and 8, the aforementioned rear bumper 6 is in a non-obstacle crossing state, and when the upper ends of the aforementioned left and right cantilevers 4 and 5 are respectively in a state of being disengaged from the aforementioned left and right cantilever automatic locking and unlocking mechanisms 7 and 8, the lower ends of the aforementioned left and right cantilevers 4 and 5 together with the rear bumper 6 are flipped in the counterclockwise direction to make the aforementioned rear bumper 6 in an obstacle crossing state.

[0022] See you next time Figure 1The left cantilever connecting frame 2 is composed of a left cantilever connecting frame top plate 21, a left cantilever connecting frame left side plate 22 and a left cantilever connecting frame right side plate 23. The left cantilever connecting frame left side plate 22 and the left cantilever connecting frame right side plate 23 are respectively formed by symmetrically bending the left and right sides of the left cantilever connecting frame top plate 21 in the length direction downward. The left and right side plates 22 and 23 of the left cantilever connecting frame are parallel to each other, and the rear end right side of the left cantilever connecting frame right side plate 23 is welded and fixed to the left side surface of the aforementioned chassis beam connecting cross beam 1, and the left and right side plates 22 and 2 The front end of the left cantilever 4 protrudes out of the front side of the chassis beam connecting the cross beam 1, and the left cantilever connecting frame top plate 21, the left cantilever connecting frame left side plate 22 and the left cantilever connecting frame right side plate 23 together form a left cantilever connecting back cavity 24 with a cross-section in the shape of a letter "ㄇ". The upper end of the aforementioned left cantilever 4 is pivotally connected between the front ends of the left and right side plates 22 and 23 of the left cantilever connecting frame at a position corresponding to the front end of the aforementioned left cantilever connecting frame cavity 24; the aforementioned right cantilever connecting frame 3 is composed of the right cantilever connecting frame top plate 31, the right cantilever connecting frame left side plate 32 and the right cantilever connecting frame right side plate 33 The left side plate 32 of the right cantilever connecting frame and the right side plate 33 of the right cantilever connecting frame are respectively formed by symmetrically bending the left and right sides of the length direction of the right cantilever connecting frame top plate 31 downward, and the left and right side plates 32, 33 of the right cantilever connecting frame are parallel to each other, and the left side of the rear end of the left side plate 32 of the right cantilever connecting frame is welded and fixed to the right side surface of the aforementioned chassis beam connecting cross beam 1, and the front ends of the left and right side plates 32, 33 of the right cantilever connecting frame protrude out of the front side surface of the chassis beam connecting cross beam 1, and are composed of the right cantilever connecting frame top plate 31, the right cantilever connecting frame left side plate 32 and the right The right side plate 33 of the cantilever connecting frame together constitutes a right cantilever connecting frame cavity 34 with a U-shaped cross-section; the upper end of the aforementioned right cantilever 5 is pivotally connected between the front ends of the left and right side plates 32, 33 of the right cantilever connecting frame at a position corresponding to the front end of the aforementioned right cantilever connecting frame cavity 34; the aforementioned left cantilever automatic locking and unlocking mechanism 7 is arranged between the front end of the aforementioned left cantilever connecting frame cavity 24 and the rear side of the upper end of the left cantilever 4; the aforementioned right cantilever automatic locking and unlocking mechanism 8 is arranged between the front end of the aforementioned right cantilever connecting frame cavity 34 and the rear side of the upper end of the right cantilever 5.

[0023] See you next time Figure 1A left cantilever upper end baffle 241 is preferably fixed by welding in the aforementioned left cantilever connecting frame cavity 24 and at the front end of the left cantilever connecting frame cavity 24, and a left cantilever upper end buffer pad 2411 is fixed on the front side of the left cantilever upper end baffle 241, the upper end of the aforementioned left cantilever 4 is in contact (sticking) with the left cantilever upper end buffer pad 2411 at a position corresponding to the left cantilever upper end buffer pad 2411, and the upper end of the left cantilever 4 is pivotally connected between the front ends of the left and right side plates 22, 23 of the aforementioned left cantilever connecting frame at a position corresponding to the front of the aforementioned left cantilever upper end buffer pad 2411; the aforementioned left cantilever automatic locking and unlocking mechanism 7 is arranged between the lower rear side corresponding to the aforementioned left cantilever upper end baffle 241 and the rear side of the upper end of the aforementioned left cantilever 4. ; A right cantilever upper end baffle 341 is preferably fixed by welding in the aforementioned right cantilever connecting frame cavity 34 and at the front end of the right cantilever connecting frame cavity 34, and a right cantilever upper end buffer pad 3411 is fixed on the front side of the right cantilever upper end baffle 341, the upper end of the aforementioned right cantilever 5 is in contact (sticking) with the right cantilever upper end buffer pad 3411 at a position corresponding to the right cantilever upper end buffer pad 3411, and the upper end of the right cantilever 5 is pivotally connected between the front ends of the left and right side plates 32, 33 of the aforementioned right cantilever connecting frame at a position corresponding to the front of the aforementioned right cantilever upper end buffer pad 3411; the aforementioned right cantilever automatic locking and unlocking mechanism 8 is arranged between the lower rear side corresponding to the aforementioned right cantilever upper end baffle 341 and the rear side of the upper end of the aforementioned right cantilever 5.

[0024] Still see Figure 1A left cantilever upper end left supporting shaft head hole 221 is provided on the left side plate 22 of the aforementioned left cantilever connecting frame and in front of the aforementioned left cantilever upper end baffle 241, and a left cantilever upper end right supporting shaft head hole 231 corresponding to the left cantilever upper end left supporting shaft head hole 221 is provided on the right side plate 23 of the aforementioned left cantilever connecting frame and also in front of the left cantilever upper end baffle 241; a right cantilever upper end left supporting shaft head hole 321 is provided on the left side plate 32 of the aforementioned right cantilever connecting frame and in front of the aforementioned right cantilever upper end baffle 341, and a right cantilever upper end left supporting shaft head hole 321 is provided on the right side plate 33 of the aforementioned right cantilever connecting frame and also in front of the right cantilever upper end baffle 341 The right supporting shaft head hole 331 at the upper end of the right cantilever is arranged corresponding to the left supporting shaft head hole 321 at the upper end of the right cantilever; the upper end of the aforementioned left cantilever 4 is pivotally connected between the front ends of the left and right side plates 22, 23 of the aforementioned left cantilever connecting frame at a position corresponding to the left supporting shaft head hole 221 at the upper end of the left cantilever and the right supporting shaft head hole 231 at the upper end of the left cantilever, and at the same time corresponds to the front end of the aforementioned left cantilever connecting frame cavity 24; the upper end of the aforementioned right cantilever 5 is pivotally connected between the front ends of the left and right side plates 32, 33 of the aforementioned right cantilever connecting frame at a position corresponding to the left supporting shaft head hole 321 at the upper end of the right cantilever and the right supporting shaft head hole 331 at the upper end of the right cantilever, and at the same time corresponds to the front end of the aforementioned right cantilever connecting frame cavity 34.

[0025] See you next time Figure 1 A left cantilever pivot support shaft sleeve 42 is provided at the upper end of the aforementioned left cantilever 4, the left end of the left cantilever pivot support shaft sleeve 42 protrudes out of the left side surface of the upper end of the left cantilever 4, and the right end protrudes out of the right side surface of the upper end of the left cantilever 4, and a left cantilever shaft sleeve pivot support shaft 421 is inserted in the left cantilever pivot support shaft sleeve 42, the left end of the left cantilever shaft sleeve pivot support shaft 421 is inserted into the left support shaft head hole 221 of the aforementioned left cantilever upper end and extends to the left side of the left cantilever connecting frame left side plate 22, and the right end of the left cantilever shaft sleeve pivot support shaft 421 is inserted into the right support shaft head hole 221 of the aforementioned left cantilever upper end Bearing shaft head hole 231; a right cantilever pivot support sleeve 52 is arranged at the upper end of the aforementioned right cantilever 5, the left end of the right cantilever pivot support sleeve 52 protrudes from the left side surface of the upper end of the right cantilever 5, and the right end protrudes from the right side surface of the upper end of the right cantilever 5, and a right cantilever sleeve pivot support shaft 521 is inserted in the right cantilever pivot support sleeve 52, the left end of the right cantilever sleeve pivot support shaft 521 is inserted into the aforementioned left supporting shaft head hole 321 at the upper end of the right cantilever, and the right end is inserted into the aforementioned right supporting shaft head hole 331 at the upper end of the right cantilever and extends to the right side of the right side plate 33 of the right cantilever connecting frame.

[0026] See you next time Figure 1 And combined with Figure 2 A left limit plate slot 4211 ( Figure 2Detailed description), a left limit plate 42111 for preventing the left cantilever shaft sleeve pivot support shaft 421 from moving is inserted in the position corresponding to the left limit plate slot 4211, and the front end and rear end of the left limit plate 42111 are each fixed to the left side surface of the left cantilever connecting frame left plate 22 by a left limit plate fixing screw 42112; a right limit plate slot 5211 is provided on the right end surface of the right cantilever shaft sleeve pivot support shaft 521, and a right limit plate 52111 for preventing the right cantilever shaft sleeve pivot support shaft 521 from moving is inserted in the position corresponding to the right limit plate slot 5211, and the front end and rear end of the right limit plate 52111 are each fixed to the right side surface of the left side plate 33 of the right cantilever connecting frame by a right limit plate fixing screw 52112.

[0027] See also Figure 2 And combined with Figure 1 Since the structure of the aforementioned right cantilever automatic locking and unlocking mechanism 8 is the same as that of the aforementioned left cantilever automatic locking and unlocking mechanism 7, the applicant will only explain the left cantilever automatic locking and unlocking mechanism 7 in detail below. The left cantilever automatic locking and unlocking mechanism 7 includes a left cantilever connecting plate 71, a left cantilever locking flange matching plate 72 and a locking block 73. The left cantilever connecting plate 71 is arranged in the aforementioned left cantilever connecting frame cavity 24 at a position corresponding to the rear of the aforementioned left cantilever upper end baffle 241 and is located at the lower part of the left cantilever connecting frame cavity 24. A left cantilever connecting plate folding plate 711 folded backward and perpendicular to the left cantilever connecting plate 71 is respectively formed at the left end and the right end of the left cantilever connecting plate 71. The left cantilever connecting plate folding plate 711 located at the left end of the left cantilever connecting plate 71 and the left cantilever connecting plate folding plate 711 located at the right end of the left cantilever connecting plate 71 are each composed of Figure 1The illustrated left cantilever connecting plate folding plate fixing screws 7111 are fixed to the lower part of the opposite side of the left and right side plates 22, 23 of the aforementioned left cantilever connecting frame, and the left and right ends of the left cantilever locking flange matching plate 72 are respectively fixed to the front lower part of the left cantilever connecting plate 71 by the left cantilever locking flange matching plate fixing screws 721, and a pair of locking block flange limiting seats 722 are formed in the middle of the front side surface of the left cantilever locking flange matching plate 72, and the space between the pair of locking block flange limiting seats 722 is formed as a locking block flange probe cavity 723, and a half of each is formed at the central position of the surface of the opposite side of the pair of locking block flange limiting seats 722. A circular ball head 7221, the locking block 73 is fixed to the rear side of the upper end of the left cantilever 4 at a position corresponding to the aforementioned locking block flange protruding into the cavity 723 by a locking block fixing screw, and a locking block flange 731 protruding from the rear side surface of the locking block 73 is formed on the rear side of the locking block 73 and at a position corresponding to the aforementioned locking block flange protruding into the cavity 723. When the locking block flange 731 is in a state of being engaged with the aforementioned locking block flange protruding into the cavity 723, the aforementioned rear bumper 6 is in a non-obstacle surmounting state, and when the locking block flange 731 is in a state of being out of the locking block flange protruding into the cavity 723, the aforementioned rear bumper 6 is in an automatic obstacle surmounting state.

[0028] Depend on Figure 1 As shown, a pair of left side plate screw holes 222 are provided at the front end of the left side plate 22 of the left cantilever connecting frame and at the position of the left cantilever connecting plate folding plate 711 corresponding to the left end of the left cantilever connecting plate 71, and a pair of right side plate screw holes 232 are provided at the front end of the right side plate 23 of the left cantilever connecting frame and at the position of the left cantilever connecting plate folding plate 711 corresponding to the right end of the left cantilever connecting plate 71. Correspondingly, a pair of folding plate fixing screw holes 7112 are provided on the left cantilever connecting plate folding plate 711 at the left and right ends of the left cantilever connecting plate 71, respectively. A pair of folding plate fixing screw holes 7112 on the left cantilever connecting plate folding plate 711 at the left end of 1 correspond to the aforementioned pair of left side plate screw holes 222, and a pair of folding plate fixing screw holes 7112 on the left cantilever connecting plate folding plate 711 located at the right end of the left cantilever connecting plate 71 correspond to the aforementioned pair of right side plate screw holes 232, so that the left cantilever connecting plate 71 is fixed between the opposite sides of the left and right side plates 22, 23 of the left cantilever connecting frame by the aforementioned left cantilever connecting plate folding plate fixing screws 7111, and is located in the lower rear part of the left cantilever upper end baffle 241 in the left cantilever connecting frame cavity 24.

[0029] Depend on Figure 1As shown, a left cantilever rear bumper mounting plate 411 is fixed to the front side of the left connecting end 41 of the aforementioned rear bumper, and a right cantilever rear bumper mounting plate 511 is fixed to the front side of the right connecting end 51 of the aforementioned rear bumper. The middle part of the aforementioned rear bumper 6 is fixed to the left and right cantilever rear bumper mounting plates 411 and 511 by rear bumper fixing screws 61 respectively.

[0030] In the present embodiment, the aforementioned rear bumper 6 is formed by extruding an aluminum extrusion material by means of an aluminum extrusion die, but it may also be made of other metal materials.

[0031] Preferably, anti-skid convex strips 62 are spaced apart on the upper surface of the rear bumper 6 in the longitudinal direction. The provision of the anti-skid convex strips 62 is helpful to prevent the firefighters from slipping when stepping on it.

[0032] See also Figure 3 , when the fire truck is in normal driving state, that is, there is no Figure 4 In the case of the obstacle 9 shown in the figure, the left and right cantilevers 4, 5 and the rear bumper 6 are in a state of Figure 3 In this state, the locking block flange 731 of the locking block 73 is embedded in the aforementioned and Figure 2 The locking block flange shown in detail is inserted into the cavity 723, that is, it is in a locked state.

[0033] See also Figure 4 When the fire truck encounters an obstacle 9 on the road during driving, if the height of the obstacle 9 is higher than that of the rear bumper 6, then when the vehicle is decelerating forward, the obstacle 9 will force the rear bumper 6 together with the left and right cantilevers 4 and 5 to slowly flip in the counterclockwise direction (it can also be called that the rear bumper 6 tilts up) until it passes over the obstacle 9. In the aforementioned situation, the vehicle usually needs to slow down reasonably. And in the process of the aforementioned counterclockwise rotation of the left and right cantilevers 4 and 5, the upper ends of the left and right cantilevers 4 and 5 rotate counterclockwise through the left and right cantilever pivot support sleeves 42 and 52 respectively, and the higher the height of the obstacle 9, the greater the counterclockwise rotation angle. After the rear bumper 6 passes over the obstacle 9, for example, in a state caused by Figure 4 After the left side of the obstacle 9 shown in the figure, the left and right cantilevers 4, 5 together with the rear bumper 6 are restored to the original position. Figure 3 In the status shown, the fire truck is running normally.

[0034] In summary, the technical solution provided by the present invention makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A fire truck rear bumper device with an obstacle-crossing function, the fire truck comprising a chassis beam connecting crossbeam (1) fixed between opposite sides of one end of a pair of longitudinally parallel frame chassis beams facing the rear of the vehicle, the rear bumper device with the obstacle-crossing function comprising a left cantilever connecting frame (2), a right cantilever connecting frame (3), a left cantilever (4), a right cantilever (5) and a rear bumper (6), the rear end right side of the left cantilever connecting frame (2) is fixed to the left side surface of the chassis beam connecting crossbeam (1), the rear end left side of the right cantilever connecting frame (3) is fixed to the right side surface of the chassis beam connecting crossbeam (1), and the front ends of the left and right cantilever connecting frames (2, 3) each protrude from the front side surface of the chassis beam connecting crossbeam (1) , and correspond to each other on the left and right, the upper end of the left cantilever (4) is connected to the front end of the left cantilever connecting frame (2), and the lower end of the left cantilever (4) extends downward and constitutes a left connecting end (41) of the rear bumper, the right cantilever (5) corresponds to the left cantilever (4), the upper end of the right cantilever (5) is connected to the front end of the right cantilever connecting frame (3), and the lower end of the right cantilever (5) extends downward and constitutes a right connecting end (51) of the rear bumper, the middle part of the rear bumper (6) is connected to the left connecting end (41) of the rear bumper and the right connecting end (51) of the rear bumper, and the left end of the rear bumper (6) extends leftward to the left side of the left connecting end (41) of the rear bumper, and the right end extends rightward to the right side of the right connecting end (51) of the rear bumper; characterized in that: A left cantilever automatic locking and unlocking mechanism (7) is arranged between the front end of the left cantilever connecting frame (2) and the upper end of the left cantilever (4), and a right cantilever automatic locking and unlocking mechanism (8) is arranged between the front end of the right cantilever connecting frame (3) and the upper end of the right cantilever (5); when the upper ends of the left and right cantilever (4, 5) are respectively in a state of being engaged with the left and right cantilever automatic locking and unlocking mechanisms (7, 8), the rear bumper (6) is in a non-obstacle crossing state, and when the upper ends of the left and right cantilever (4, 5) are respectively in a state of being disengaged from the left and right cantilever automatic locking and unlocking mechanisms (7, 8), the lower ends of the left and right cantilever (4, 5) together with the rear bumper (6) are turned counterclockwise so that the rear bumper (6) is in an obstacle crossing state.

2. The fire truck rear bumper device with obstacle crossing function according to claim 1, characterized in that: The left cantilever connecting frame (2) is composed of a left cantilever connecting frame top plate (21), a left cantilever connecting frame left side plate (22) and a left cantilever connecting frame right side plate (23). The left cantilever connecting frame left side plate (22) and the left cantilever connecting frame right side plate (23) are respectively formed by symmetrically bending the left and right sides of the left cantilever connecting frame top plate (21) in the length direction downward. The left and right sides of the left cantilever connecting frame (22, 23) are parallel to each other, and the right side of the rear end of the left cantilever connecting frame right side plate (23) is fixed to the left side surface of the chassis beam connecting cross beam (1), and the left and right sides of the left cantilever connecting frame (22, 23) are respectively formed by symmetrically bending the left and right sides of the left cantilever connecting frame top plate (21) in the length direction downward. The front end of the left cantilever (4) protrudes out of the front side of the chassis beam connecting crossbeam (1), and is composed of a left cantilever connecting frame top plate (21), a left cantilever connecting frame left side plate (22) and a left cantilever connecting frame right side plate (23) to form a left cantilever connecting return cavity (24) with a U-shaped cross section; the upper end of the left cantilever (4) is pivotally connected between the front ends of the left and right side plates (22, 23) of the left cantilever connecting frame at a position corresponding to the front end of the left cantilever connecting frame cavity (24); the right cantilever connecting frame (3) is composed of a right cantilever connecting frame top plate (31), a right cantilever connecting frame left side plate (32) and a right cantilever connecting frame right side plate (33) ), the left side plate (32) of the right cantilever connecting frame and the right side plate (33) of the right cantilever connecting frame are respectively formed by symmetrically bending the left and right sides of the right cantilever connecting frame top plate (31) in the length direction downward, the left and right side plates (32, 33) of the right cantilever connecting frame are parallel to each other, and the left side of the rear end of the left side plate (32) of the right cantilever connecting frame is fixed to the right side surface of the chassis beam connecting cross beam (1), and the front ends of the left and right side plates (32, 33) of the right cantilever connecting frame protrude from the front side surface of the chassis beam connecting cross beam (1), and are composed of the right cantilever connecting frame top plate (31), the right cantilever connecting frame left side plate (32) and the right cantilever connecting frame. The right side plate (33) of the arm connecting frame together forms a right cantilever connecting frame cavity (34) with a U-shaped cross section; the upper end of the right cantilever (5) is pivotally connected between the front ends of the left and right side plates (32, 33) of the right cantilever connecting frame at a position corresponding to the front end of the right cantilever connecting frame cavity (34); the left cantilever automatic locking and unlocking mechanism (7) is arranged between the front end of the left cantilever connecting frame cavity (24) and the rear side of the upper end of the left cantilever (4); the right cantilever automatic locking and unlocking mechanism (8) is arranged between the front end of the right cantilever connecting frame cavity (34) and the rear side of the upper end of the right cantilever (5).

3. The fire truck rear bumper device with obstacle crossing function according to claim 2, characterized in that: A left cantilever upper end baffle (241) is fixed in the left cantilever connecting frame cavity (24) and at the front end of the left cantilever connecting frame cavity (24); a left cantilever upper end buffer pad (2411) is fixed on the front side of the left cantilever upper end baffle (241); the upper end of the left cantilever (4) is in contact with the left cantilever upper end buffer pad (2411) at a position corresponding to the left cantilever upper end buffer pad (2411); and the upper end of the left cantilever (4) is pivotally connected between the front ends of the left and right side plates (22, 23) of the left cantilever connecting frame at a position corresponding to the front of the left cantilever upper end buffer pad (2411); the left cantilever automatic locking and unlocking mechanism (7) is arranged between the lower rear side corresponding to the left cantilever upper end baffle (241) and the rear side of the upper end of the left cantilever (4); A right cantilever upper end baffle (341) is fixed in the right cantilever connecting frame cavity (34) and at the front end of the right cantilever connecting frame cavity (34); a right cantilever upper end buffer pad (3411) is fixed on the front side of the right cantilever upper end baffle (341); the upper end of the right cantilever (5) is in contact with the right cantilever upper end buffer pad (3411) at a position corresponding to the right cantilever upper end buffer pad (3411); and the upper end of the right cantilever (5) is pivotally connected between the front ends of the left and right side plates (32, 33) of the right cantilever connecting frame at a position corresponding to the front of the right cantilever upper end buffer pad (3411); the right cantilever automatic locking and unlocking mechanism (8) is arranged between the lower rear side corresponding to the right cantilever upper end baffle (341) and the rear side of the upper end of the right cantilever (5).

4. The fire truck rear bumper device with obstacle crossing function according to claim 3, characterized in that: A left cantilever upper end left support shaft head hole (221) is provided on the left side plate (22) of the left cantilever connecting frame and located in front of the left cantilever upper end baffle (241), and a left cantilever upper end right support shaft head hole (231) corresponding to the left cantilever upper end left support shaft head hole (221) is provided on the right side plate (23) of the left cantilever connecting frame and located in front of the left cantilever upper end baffle (241); a right cantilever upper end left support shaft head hole (321) is provided on the left side plate (32) of the right cantilever connecting frame and located in front of the right cantilever upper end baffle (341), and a right cantilever upper end right support shaft head hole (321) is provided on the right side plate (33) of the right cantilever connecting frame and located in front of the right cantilever upper end baffle (341). A right support shaft head hole (331) at the upper end of the right cantilever corresponds to the left support shaft head hole (321) at the upper end of the right cantilever; the upper end of the left cantilever (4) is pivotally connected between the front ends of the left and right side plates (22, 23) of the left cantilever connecting frame at a position corresponding to the left support shaft head hole (221) at the upper end of the left cantilever and the right support shaft head hole (231) at the upper end of the left cantilever, and at the same time corresponds to the front end of the left cantilever connecting frame cavity (24); the upper end of the right cantilever (5) is pivotally connected between the front ends of the left and right side plates (32, 33) of the right cantilever connecting frame at a position corresponding to the left support shaft head hole (321) at the upper end of the right cantilever and the right support shaft head hole (331) at the upper end of the right cantilever, and at the same time corresponds to the front end of the right cantilever connecting frame cavity (34).

5. The fire truck rear bumper device with obstacle-crossing function according to claim 4, characterized in that: A left cantilever pivot support shaft sleeve (42) is provided at the upper end of the left cantilever (4), the left end of the left cantilever pivot support shaft sleeve (42) protrudes out of the left side surface of the upper end of the left cantilever (4), and the right end protrudes out of the right side surface of the upper end of the left cantilever (4), and a left cantilever shaft sleeve pivot support shaft (421) is inserted in the left cantilever pivot support shaft sleeve (42), the left end of the left cantilever shaft sleeve pivot support shaft (421) is inserted into the left support shaft head hole (221) at the upper end of the left cantilever and extends to the left side of the left side plate (22) of the left cantilever connecting frame, and the right end of the left cantilever shaft sleeve pivot support shaft (421) is inserted into the right support shaft at the upper end of the left cantilever A right cantilever pivot support shaft sleeve (52) is arranged at the upper end of the right cantilever (5), the left end of the right cantilever pivot support shaft sleeve (52) protrudes out of the left side surface of the upper end of the right cantilever (5), and the right end protrudes out of the right side surface of the upper end of the right cantilever (5), and a right cantilever shaft sleeve pivot support shaft (521) is inserted in the right cantilever pivot support shaft sleeve (52), the left end of the right cantilever shaft sleeve pivot support shaft (521) is inserted into the left support shaft head hole (321) at the upper end of the right cantilever, and the right end is inserted into the right support shaft head hole (331) at the upper end of the right cantilever and extends to the right side of the right side plate (33) of the right cantilever connecting frame.

6. The fire truck rear bumper device with obstacle-crossing function according to claim 5, characterized in that: A left limit plate slot (4211) is provided on the left end surface of the left cantilever shaft sleeve pivot support shaft (421), and a left limit plate (42111) is inserted at a position corresponding to the left limit plate slot (4211) for preventing the left cantilever shaft sleeve pivot support shaft (421) from moving, and the front end and the rear end of the left limit plate (42111) are respectively fixed to the left side surface of the left side plate (22) of the left cantilever connecting frame by a left limit plate fixing screw (42112); A right limit plate slot (5211) is provided on the right end surface of the right cantilever sleeve pivot support shaft (521), and a right limit plate (52111) is inserted at a position corresponding to the right limit plate slot (5211) for preventing the right cantilever sleeve pivot support shaft (521) from moving, and the front end and the rear end of the right limit plate (52111) are fixed to the right side surface of the left side plate (33) of the right cantilever connecting frame by a right limit plate fixing screw (52112).

7. The fire truck rear bumper device with obstacle-crossing function according to claim 3, characterized in that: The structure of the right cantilever automatic locking and unlocking mechanism (8) is the same as that of the left cantilever automatic locking and unlocking mechanism (7), and the left cantilever automatic locking and unlocking mechanism (7) comprises a left cantilever connecting plate (71), a left cantilever locking flange matching plate (72) and a locking block (73), the left cantilever connecting plate (71) being arranged in the left cantilever connecting frame cavity (24) at a position corresponding to the rear of the left cantilever upper end baffle (241) and located at the lower part of the left cantilever connecting frame cavity (24), and the left cantilever connecting plate (71) and the right cantilever connecting plate (73) are provided at the left end and the right end of the left cantilever connecting plate (71). Each of the structures has a left cantilever connecting plate folding plate (711) folded backward and perpendicular to the left cantilever connecting plate (71); the left cantilever connecting plate folding plate (711) located at the left end of the left cantilever connecting plate (71) and the left cantilever connecting plate folding plate (711) located at the right end of the left cantilever connecting plate (71) are respectively fixed to the lower part of the left and right side plates (22, 23) facing each other by left cantilever connecting plate folding plate fixing screws (7111); the left end and the right end of the left cantilever locking flange matching plate (72) are respectively fixed by the left cantilever locking flange matching plate The screw (721) is fixed to the lower front part of the left cantilever connecting plate (71), and a pair of locking block flange limiting seats (722) are formed in the middle of the front side of the left cantilever locking flange matching plate (72), and the space between the pair of locking block flange limiting seats (722) is formed as a locking block flange insertion cavity (723), and a semicircular ball head (7221) is formed at the central position of the surface of the pair of locking block flange limiting seats (722) on the opposite side, and the locking block (73) is fixed at the position corresponding to the locking block flange insertion cavity (723) by the locking block fixing screw. The nail is fixed to the rear side of the upper end of the left cantilever (4), and a locking block flange (731) protruding from the rear side surface of the locking block (73) is formed on the rear side of the locking block (73) and at a position corresponding to the locking block flange protruding cavity (723). When the locking block flange (731) is in a state of being engaged with the locking block flange protruding cavity (723), the rear bumper (6) is in a non-obstacle-crossing state, and when the locking block flange (731) is in a state of being out of the locking block flange protruding cavity (723), the rear bumper (6) is in an automatic obstacle-crossing state.

8. The fire truck rear bumper device with obstacle-crossing function according to claim 1, characterized in that: A left cantilever rear bumper mounting plate (411) is fixed on the front side of the left connecting end (41) of the rear bumper, a right cantilever rear bumper mounting plate (511) is fixed on the front side of the right connecting end (51) of the rear bumper, and the middle part of the rear bumper (6) is fixed to the left and right cantilever rear bumper mounting plates (411, 511) by rear bumper fixing screws (61).

9. A fire truck rear bumper device with obstacle-crossing function according to claim 1 or 8, characterized in that: The rear bumper (6) is made of aluminum extrusion material by means of an aluminum extrusion die.

10. The fire truck rear bumper device with obstacle-crossing function according to claim 9, characterized in that: Anti-skid convex strips (62) are distributed at intervals on the upper surface of the rear bumper (6) in the length direction.

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