Fire fighting truck rear bumper device with obstacle crossing function

Abstract

The utility model 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 utility model belongs to the technical field of vehicle rear safety devices, and particularly relates to a rear bumper device for a fire truck 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, freight trucks, container trucks, etc. Specifically, it mainly absorbs and mitigates external impact forces, protects the safety of the vehicle body, and avoids the rear-end vehicle, especially a car, from drilling under the large vehicle during a rear-end collision, so as to avoid causing fatal injuries, which has a positive significance for protecting the lives and safety of the car and its passengers. In addition, for a fire truck for fire fighting and rescue, endowing it with an obstacle-crossing function can save precious time for disaster relief and rescue. Because if it detours to avoid obstacles or delays time for clearing obstacles, then undoubtedly the opportunity to invest in disaster relief and rescue will be delayed.

[0003] In the publicly available Chinese patent documents, there is no lack of technical information related to vehicle bumpers, such as CN203611908U (adjustable rear bumper device for a freight truck), CN205524103U (biomimetic rear bumper for a heavy vehicle), and CN1775594A (rear bumper device for a freight truck), etc. It is not that the vehicle rear bumper devices in the prior art exemplified above only have the functions of absorbing and mitigating external impact forces and preventing a car from drilling under the vehicle during a rear-end collision in a stereotyped manner. Although CN203611908U and CN1775594A have the function of adjusting the height position of the rear bumper as needed, they do not have other functions except the aforementioned functions of absorbing and mitigating external impact forces and preventing a car from drilling under the vehicle during a rear-end collision. Typical examples of such other functions are that in some special sections, due to a landslide, stones roll down or heavy goods (objects) roll down from other vehicles onto the road surface where the vehicle is traveling. Then the aforementioned rolling stones or heavy goods rolling down from other vehicles undoubtedly constitute obstacles affecting vehicle passage. And when it is impossible to remove the obstacles by human ability, if the vehicle changes its route, it will delay time. For the aforementioned fire truck for fire fighting and rescue involving life and property safety where every second counts, it is very likely that the loss at the fire scene will be further expanded due to the loss of the best opportunity. Also, if waiting for other vehicles to come and remove the obstacles, the same problem of losing the best disaster relief opportunity will occur.

[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 mitigating external impact forces and preventing a car from drilling under the vehicle during a rear-end collision. The technical solution to be introduced below was generated under this background. Summary of the Utility Model

[0005] The task of the present utility model is to provide a rear bumper device for a fire truck with an obstacle-crossing function, which can automatically cross obstacles on the road and avoid delaying the disaster relief time.

[0006] The task of the present utility model is completed as follows. A rear bumper device for a fire truck with an obstacle-crossing function, the fire truck includes a chassis beam connecting cross beam fixed between the opposite sides of one end of a pair of longitudinally parallel chassis frame beams facing the vehicle tail. The rear bumper device with an obstacle-crossing function includes 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 cross beam, and 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 cross beam. The front ends of the left and right cantilever connecting frames protrude from the front side surface of the chassis beam connecting cross beam 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 extends downward and constitutes the right connecting end of the rear bumper. The middle part of the rear bumper is connected to the left connecting end of the rear bumper and the right connecting end of the rear bumper. The left end of the rear bumper extends to the left of the left connecting end of the rear bumper, and the right end extends to the right of the right connecting end of the rear bumper. The feature is that a left cantilever automatic locking and unlocking mechanism is provided 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 provided 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 fitted with the left and right cantilever automatic locking and unlocking mechanisms, the rear bumper is in a non-obstacle-crossing state. Moreover, 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 flip counterclockwise to make the rear bumper in an obstacle-crossing state.

[0007] In a specific embodiment of the present utility model, 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 downward from the left and right sides in the length direction of the left cantilever connecting frame top plate. The left and right side plates of the left cantilever connecting frame are parallel to each other left and right. And the right side of the rear end of the left cantilever connecting frame right side plate is fixed to the left side surface of the chassis girder connecting cross beam, while the front ends of the left and right side plates of the left cantilever connecting frame protrude from the front side surface of the chassis girder connecting cross beam. A left cantilever connecting frame cavity with a cross-sectional shape of a reversed "C" shape is jointly formed by the left cantilever connecting frame top plate, the left cantilever connecting frame left side plate, and the left cantilever connecting frame right side plate. 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 end of the left cantilever connecting frame cavity. The right cantilever connecting frame is composed of a right cantilever connecting frame top plate, a right cantilever connecting frame left side plate, and a right cantilever connecting frame right side plate. The right cantilever connecting frame left side plate and the right cantilever connecting frame right side plate are respectively formed by symmetrically bending downward from the left and right sides in the length direction of the right cantilever connecting frame top plate. The left and right side plates of the right cantilever connecting frame are parallel to each other left and right. And the left side of the rear end of the right cantilever connecting frame left side plate is fixed to the right side surface of the chassis girder connecting cross beam, while the front ends of the left and right side plates of the right cantilever connecting frame protrude from the front side surface of the chassis girder connecting cross beam. A right cantilever connecting frame cavity with a cross-sectional shape of a reversed "C" shape is jointly formed by the right cantilever connecting frame top plate, the right cantilever connecting frame left side plate, and the right cantilever connecting frame right side plate. 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] It should be noted that the description of the cross-sectional shape as "ㄇ" in the original text is not very accurate in the translation context, and it is more appropriate to describe it as a reversed "C" shape for a more accurate understanding. You can adjust it according to the actual situation.In another specific embodiment of the present utility model, a left upper cantilever baffle is fixed inside the left cantilever connecting frame cavity and at the front end of the left cantilever connecting frame cavity. A left upper cantilever cushion is fixed on the front side surface of the left upper cantilever baffle. The upper end of the left cantilever contacts the left upper cantilever cushion at a position corresponding to the left upper cantilever cushion, 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 in front of the left upper cantilever cushion; the left cantilever automatic locking and unlocking mechanism is arranged between the lower rear side corresponding to the left upper cantilever baffle and the rear side of the upper end of the left cantilever; a right upper cantilever baffle is fixed inside the right cantilever connecting frame cavity and at the front end of the right cantilever connecting frame cavity. A right upper cantilever cushion is fixed on the front side surface of the right upper cantilever baffle. The upper end of the right cantilever contacts the right upper cantilever cushion at a position corresponding to the right upper cantilever cushion, 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 in front of the right upper cantilever cushion; the right cantilever automatic locking and unlocking mechanism is arranged between the lower rear side corresponding to the right upper cantilever baffle and the rear side of the upper end of the right cantilever.

[0009] In yet another specific embodiment of the present utility model, a left upper cantilever left support shaft head hole is provided on the left side plate of the left cantilever connecting frame and at a position in front of the left upper cantilever baffle, and a left upper cantilever right support shaft head hole corresponding to the left upper cantilever left support shaft head hole is provided on the right side plate of the left cantilever connecting frame and at the same position in front of the left upper cantilever baffle; a right upper cantilever left support shaft head hole is provided on the left side plate of the right cantilever connecting frame and at a position in front of the right upper cantilever baffle, and a right upper cantilever right support shaft head hole corresponding to the right upper cantilever left support shaft head hole is provided on the right side plate of the right cantilever connecting frame and at the same position in front of the right upper cantilever baffle; 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 between the left upper cantilever left support shaft head hole and the left upper cantilever right support shaft head hole and simultaneously corresponding to the front end of the left cantilever connecting frame cavity; 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 between the right upper cantilever left support shaft head hole and the right upper cantilever right support shaft head hole and simultaneously corresponding to the front end of the right cantilever connecting frame cavity.

[0010] In still another specific embodiment of the present utility model, a left cantilever pivot support bushing is provided at the upper end of the left cantilever. The left end of the left cantilever pivot support bushing 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 bushing pivot support shaft is inserted into the left cantilever pivot support bushing. The left end of the left cantilever bushing 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 bushing pivot support shaft is inserted into the right support shaft head hole at the upper end of the left cantilever; a right cantilever pivot support bushing is provided at the upper end of the right cantilever. The left end of the right cantilever pivot support bushing 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 bushing pivot support shaft is inserted into the right cantilever pivot support bushing. The left end of the right cantilever bushing pivot support shaft is inserted into the left support shaft head hole at the upper end of the right cantilever, and the right end is inserted into the right support 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 yet another specific embodiment of the present utility model, a left limit insertion plate groove is formed on the left end face of the left cantilever bushing pivot support shaft. A left limit insertion plate for preventing the left cantilever bushing pivot support shaft from moving axially is inserted at a position corresponding to the left limit insertion plate groove. And the front end and the rear end of the left limit insertion plate are each fixed to the left side surface of the left side plate of the left cantilever connecting frame by a left limit insertion plate fixing screw; a right limit insertion plate groove is formed on the right end face of the right cantilever bushing pivot support shaft. A right limit insertion plate for preventing the right cantilever bushing pivot support shaft from moving axially is inserted at a position corresponding to the right limit insertion plate groove. And the front end and the rear end of the right limit insertion plate are each fixed to the right side surface of the right side plate of the right cantilever connecting frame by a right limit insertion plate fixing screw.

[0012] In a further specific embodiment of the present utility model, the structure of the right cantilever automatic locking and unlocking mechanism is the same as that of the left cantilever automatic locking and unlocking mechanism. The left cantilever automatic locking and unlocking mechanism includes a left cantilever connecting plate, a left cantilever locking flange mating plate, and a locking block. The left cantilever connecting plate is disposed in the left cantilever connecting frame cavity at a position corresponding to the rear of the upper end baffle of the left cantilever and is located at the lower part of the left cantilever connecting frame cavity. At the left end and the right end of the left cantilever connecting plate, there are respectively formed left cantilever connecting plate folding plates that fold backward and are perpendicular to the left cantilever connecting plate. The left cantilever connecting plate folding plate located at the left end of the left cantilever connecting plate and the left cantilever connecting plate folding plate located at the right end of the left cantilever connecting plate are respectively fixed to the lower part of the opposite sides of the left and right side plates of the left cantilever connecting frame by left cantilever connecting plate folding plate fixing screws. The left end and the right end of the left cantilever locking flange mating plate are respectively fixed to the lower part of the front side of the left cantilever connecting plate by left cantilever locking flange mating plate fixing screws. In the middle of the front side surface of the left cantilever locking flange mating plate, there is formed a pair of locking block flange defining seats. The space between the pair of locking block flange defining seats constitutes a locking block flange inserting cavity, and at the central position of the surface of the opposite sides of the pair of locking block flange defining seats, there is respectively formed a semi-circular ball head. The locking block is fixed to the rear side of the upper end of the left cantilever by a locking block fixing screw at a position corresponding to the locking block flange inserting cavity. At the rear side of the locking block and at a position corresponding to the locking block flange inserting cavity, there is formed a locking block flange protruding from the rear side surface of the locking block. When the locking block flange is in a state of being fitted with the locking block flange inserting cavity, the rear bumper is in a non-obstacle-crossing state, and when the locking block flange is in a state of being disengaged from the locking block flange inserting cavity, the rear bumper is in an automatic obstacle-crossing state.

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

[0014] In a yet further specific embodiment of the present utility model, the rear bumper is formed by extrusion of aluminum profiles with an aluminum extrusion die.

[0015] In a yet further specific embodiment of the present utility model, anti-slip convex strips are distributed at intervals on the upper surface in the length direction of the rear bumper.

[0016] The technical effect of the technical solution provided by the present utility model lies in that: when the fire truck is in a normal driving state, the upper ends of the left and right cantilevers are respectively in a fitting and locking state with the left and right cantilever automatic locking and unlocking mechanisms, and the rear bumper is also in a horizontal state, which can play a normal role in absorbing and mitigating the external impact force when being rear-ended by a vehicle behind and preventing the car that rear-ends from getting under the vehicle; when the fire truck encounters an obstacle on the road, the upper ends of the left and right cantilevers can be separated from the left and right cantilever automatic locking and unlocking mechanisms to release the locking state, and the lower ends of the left and right cantilevers together with the rear bumper automatically rotate counterclockwise by the required angle to make the rear bumper automatically cross the obstacle, avoiding delaying the rapid passage of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 an enlarged view of part A of

[0019] Figure 3 is a schematic diagram of the present utility model in a non-obstacle-crossing state;

[0020] Figure 4 is a schematic diagram of the present utility model in an obstacle-crossing state. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to more clearly understand the technical essence and beneficial effects of the present utility model, the applicant will make a detailed description in the following in the form of embodiments. However, the descriptions of the embodiments are not limitations on the technical solution of the present utility model. Any equivalent transformation that is merely formal rather than substantial based on the concept of the present utility model should be regarded as falling within the scope of the technical solution of the present utility model.

[0022] In the following descriptions, all concepts related to directions or orientations such as up, down, left, right, front, and rear are based on Figure 1 the current position state, and thus cannot be understood as special limitations on the technical solution provided by the present utility model.

[0023] Please refer to Figure 1, showing a chassis beam connecting cross member 1 fixed between opposite sides at one end of a pair of longitudinally parallel chassis frame beams towards 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 a fire truck rear bumper device 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 cross member 1, and 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 cross member 1. The front ends of the left and right cantilever connecting frames 2 and 3 protrude from the front side surface of the chassis beam connecting cross member 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 is configured as 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 is configured as 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. The left end of the rear bumper 6 extends leftward to the left of the left connecting end 41 of the rear bumper, and the right end extends rightward to the right of the right connecting end 51 of the rear bumper.

[0024] As the technical key points of the technical solution provided by the present utility model: A left cantilever automatic locking and unlocking mechanism 7 is provided 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 provided 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 fitted 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 counterclockwise to make the aforementioned rear bumper 6 in an obstacle crossing state.

[0025] Continue to see Figure 1, the aforementioned 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 downward from the left and right sides in the length direction of the left cantilever connecting frame top plate 21. The left and right side plates 22, 23 of the left cantilever connecting frame are parallel to each other left and right. And the right side of the rear end of the left cantilever connecting frame right side plate 23 is welded and fixed to the left side surface of the aforementioned chassis girder connecting cross beam 1. The front ends of the left and right side plates 22, 23 of the left cantilever connecting frame protrude from the front side surface of the chassis girder connecting cross beam 1. The left cantilever connecting frame cavity 24 with a cross-sectional shape of a reversed C shape is jointly formed by 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. 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 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 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 right cantilever connecting frame left side plate 32 and the right cantilever connecting frame right side plate 33 are respectively formed by symmetrically bending downward from the left and right sides in the length direction of the right cantilever connecting frame top plate 31. The left and right side plates 32, 33 of the right cantilever connecting frame are parallel to each other left and right. And the left side of the rear end of the right cantilever connecting frame left side plate 32 is welded and fixed to the right side surface of the aforementioned chassis girder connecting cross beam 1. 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 girder connecting cross beam 1. The right cantilever connecting frame cavity 34 with a cross-sectional shape of a reversed C shape is jointly formed by 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 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.

[0026] Continue to see Figure 1, a left cantilever upper baffle 241 is preferably fixed by welding inside the aforementioned left cantilever connecting frame cavity 24 and at the front end of the left cantilever connecting frame cavity 24. A left cantilever upper buffer pad 2411 is fixed on the front side surface of the left cantilever upper baffle 241. The upper end of the aforementioned left cantilever 4 contacts (abuts) the left cantilever upper buffer pad 2411 at a position corresponding to the left cantilever upper 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 and 23 of the aforementioned left cantilever connecting frame at a position in front of the aforementioned left cantilever upper buffer pad 2411; the aforementioned left cantilever automatic locking and unlocking mechanism 7 is arranged between the lower rear side of the aforementioned left cantilever upper baffle 241 and the rear side of the upper end of the aforementioned left cantilever 4; a right cantilever upper baffle 341 is preferably fixed by welding inside the aforementioned right cantilever connecting frame cavity 34 and at the front end of the right cantilever connecting frame cavity 34. A right cantilever upper buffer pad 3411 is fixed on the front side surface of the right cantilever upper baffle 341. The upper end of the aforementioned right cantilever 5 contacts (abuts) the right cantilever upper buffer pad 3411 at a position corresponding to the right cantilever upper 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 and 33 of the aforementioned right cantilever connecting frame at a position in front of the aforementioned right cantilever upper buffer pad 3411; the aforementioned right cantilever automatic locking and unlocking mechanism 8 is arranged between the lower rear side of the aforementioned right cantilever upper baffle 341 and the rear side of the upper end of the aforementioned right cantilever 5.

[0027] Still see Figure 1, a left upper cantilever left support shaft head hole 221 is provided on the left side plate 22 of the foregoing left cantilever connecting frame and in front of the foregoing left upper cantilever upper baffle 241, and a left upper cantilever right support shaft head hole 231 corresponding to the left upper cantilever left support shaft head hole 221 in position is provided on the right side plate 23 of the foregoing left cantilever connecting frame and also in front of the left upper cantilever upper baffle 241; a right upper cantilever left support shaft head hole 321 is provided on the left side plate 32 of the foregoing right cantilever connecting frame and in front of the foregoing right upper cantilever upper baffle 341, and a right upper cantilever right support shaft head hole 331 corresponding to the right upper cantilever left support shaft head hole 321 in position is provided on the right side plate 33 of the foregoing right cantilever connecting frame and also in front of the right upper cantilever upper baffle 341; the upper end of the foregoing left cantilever 4 is pivotally connected between the front ends of the left and right side plates 22 and 23 of the foregoing left cantilever connecting frame at a position corresponding to the positions between the foregoing left upper cantilever left support shaft head hole 221 and the left upper cantilever right support shaft head hole 231 and simultaneously corresponding to the front end of the foregoing left cantilever connecting frame cavity 24; the upper end of the foregoing right cantilever 5 is pivotally connected between the front ends of the left and right side plates 32 and 33 of the foregoing right cantilever connecting frame at a position corresponding to the positions between the foregoing right upper cantilever left support shaft head hole 321 and the right upper cantilever right support shaft head hole 331 and simultaneously corresponding to the front end of the foregoing right cantilever connecting frame cavity 34.

[0028] Continue to see Figure 1 , a left cantilever pivot support shaft sleeve 42 is provided at the upper end of the foregoing left cantilever 4, the left end of the left cantilever pivot support shaft sleeve 42 protrudes from the left side surface of the upper end of the left cantilever 4, and the right end protrudes from 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 into 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 foregoing left upper cantilever left support shaft head hole 221 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 foregoing left upper cantilever right support shaft head hole 231; a right cantilever pivot support shaft sleeve 52 is provided at the upper end of the foregoing right cantilever 5, the left end of the right cantilever pivot support shaft 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 shaft sleeve pivot support shaft 521 is inserted into 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 foregoing right upper cantilever left support shaft head hole 321, and the right end is inserted into the foregoing right upper cantilever right support shaft head hole 331 and extends to the right side of the right side plate 33 of the right cantilever connecting frame.

[0029] Continue to see Figure 1 And in combination with Figure 2 , a left limit insertion plate groove 4211 is provided on the left end face of the foregoing left cantilever shaft sleeve pivot support shaft 421 ( Figure 2As shown in detail), a left limit insertion plate 42111 for preventing the left cantilever shaft sleeve pivot support shaft 421 from moving is inserted at a position corresponding to the left limit insertion plate groove 4211, and the front end and the rear end of the left limit insertion plate 42111 are respectively fixed to the left side surface of the left side plate 22 of the aforementioned left cantilever connecting frame by a left limit insertion plate fixing screw 42112; on the right end face of the right cantilever shaft sleeve pivot support shaft 521, a right limit insertion plate groove 5211 is provided, and a right limit insertion plate 52111 for preventing the right cantilever shaft sleeve pivot support shaft 521 from moving is inserted at a position corresponding to the right limit insertion plate groove 5211, and the front end and the rear end of the right limit insertion plate 52111 are respectively fixed to the right side surface of the left side plate 33 of the aforementioned right cantilever connecting frame by a right limit insertion plate fixing screw 52112.

[0030] Please refer to Figure 2 And in combination 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 describe 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 mating plate 72, and a locking block 73. The left cantilever connecting plate 71 is disposed in the aforementioned left cantilever connecting frame cavity 24 at a position corresponding to the rear of the aforementioned upper baffle 241 of the left cantilever and is located in the lower part of the left cantilever connecting frame cavity 24. At the left end and the right end of the left cantilever connecting plate 71, there are respectively formed left cantilever connecting plate folding plates 711 that fold backward and are perpendicular to the left cantilever connecting plate 71. The left cantilever connecting plate folding plate 711 at the left end of the left cantilever connecting plate 71 and the left cantilever connecting plate folding plate 711 at the right end of the left cantilever connecting plate 71 are each formed by Figure 1The schematic left cantilever connecting plate folding plate fixing screw 7111 is fixed to the lower part of the opposite side of the left and right side plates 22 and 23 of the aforementioned left cantilever connecting frame. The left and right ends of the left cantilever locking flange fitting plate 72 are each fixed to the lower part of the front side of the left cantilever connecting plate 71 by the left cantilever locking flange fitting plate fixing screws 721. A pair of locking block flange defining seats 722 are formed in the middle of the front side surface of the left cantilever locking flange fitting plate 72. The space between the pair of locking block flange defining seats 722 constitutes a locking block flange insertion cavity 723. And a semi-circular ball head 7221 is formed at the center of the surface of the opposite side of the pair of locking block flange defining seats 722. The locking block 73 is fixed to the rear side of the upper end of the aforementioned left cantilever 4 by the locking block fixing screws at the position corresponding to the aforementioned locking block flange insertion cavity 723. A locking block flange 731 protruding from the rear side surface of the locking block 73 is formed at the rear side of the locking block 73 and at the position corresponding to the aforementioned locking block flange insertion cavity 723. When the locking block flange 731 is in a state of being fitted with the aforementioned locking block flange insertion cavity 723, the aforementioned rear bumper 6 is in a non-overcoming obstacle state. And when the locking block flange 731 is in a state of being disengaged from the locking block flange insertion cavity 723, the aforementioned rear bumper 6 is in an automatic overcoming obstacle state.

[0031] As Figure 1 shown, a pair of left side plate screw holes 222 are provided at the front end of the left side plate 22 of the aforementioned left cantilever connecting frame and at the position of the left cantilever connecting plate folding plate 711 corresponding to the left end of the aforementioned 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 aforementioned left cantilever connecting frame and at the position of the left cantilever connecting plate folding plate 711 corresponding to the right end of the aforementioned left cantilever connecting plate 71. Correspondingly, a pair of folding plate fixing screw holes 7112 are provided on the left and right ends of the left cantilever connecting plate folding plate 711 of the aforementioned left cantilever connecting plate 71. The pair of folding plate fixing screw holes 7112 on the left cantilever connecting plate folding plate 711 at the left end of the left cantilever connecting plate 71 correspond to the aforementioned pair of left side plate screw holes 222. And the pair of folding plate fixing screw holes 7112 on the left cantilever connecting plate folding plate 711 at the right end of the left cantilever connecting plate 71 correspond to the aforementioned pair of right side plate screw holes 232. Thus, the left cantilever connecting plate 71 is fixed between the opposite sides of the left and right side plates 22 and 23 of the left cantilever connecting frame by the aforementioned left cantilever connecting plate folding plate fixing screw 7111, and is located at the lower part of the rear side of the left cantilever upper end baffle 241 in the left cantilever connecting frame cavity 24.

[0032] As 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 above situation, the vehicle usually needs to slow down reasonably. And in the process of the above-mentioned 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.

[0037] In summary, the technical solution provided by the utility model 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 right side of the rear end of the left cantilever connecting frame (2) is fixed to the left side surface of the chassis beam connecting crossbeam (1), the left side of the rear end of the right cantilever connecting frame (3) is fixed to the right side surface of the chassis beam connecting crossbeam (1), the front ends of the left and right cantilever connecting frames (2, 3) respectively protrude from the front side surface of the chassis beam connecting crossbeam (1), The left and right sides of the rear bumper (6) correspond to each other, 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 forms 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 forms 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); the characteristics are: 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 frame 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.

Images