Carbon fiber composite material automobile bumper

Abstract

The utility model relates to the technical field of automobile bumpers, in particular to a carbon fiber composite material automobile bumper which comprises a main bumper assembly, a main bumper inner supporting assembly is arranged on the inner side of the main bumper assembly, and an auxiliary bumper assembly is arranged on the outer side of the main bumper assembly. The main bumper assembly includes a bumper body. According to the scheme, the bumper body adopts the carbon fiber plate as the base layer, the bumper can efficiently absorb and disperse energy during collision due to the high-strength weight ratio characteristic of the carbon fiber plate, meanwhile, the weight is greatly reduced to optimize the fuel economy, the reinforcing layer adopts the aluminum alloy plate to enhance the rigidity, low-speed collision sinking is prevented, and the service life of the bumper is prolonged. The grid structure of the stainless steel framework further provides core support and resists structural collapse under extreme impact, the puncture-proof layer is made of glass fibers and effectively prevents sharp objects from penetrating through the puncture-proof layer, and the heat insulation layer and the impact-resistant layer achieve temperature isolation and kinetic energy absorption through polyurethane foam and polyester materials respectively.

Description

Technical Field

[0001] This utility model relates to the field of automotive bumper technology, and specifically discloses a carbon fiber composite automotive bumper. Background Technology

[0002] A car bumper is an important component of a vehicle, its primary function being to protect the vehicle and its passengers in the event of a collision. It is typically made of plastic, metal, or composite materials, offering good impact resistance and durability. Car bumpers not only absorb the impact of a collision but also prevent severe damage to the vehicle in low-speed impacts.

[0003] Car bumpers are crucial components for ensuring the safety of vehicles and passengers, and also important accessories for enhancing the appearance and performance of vehicles. For example, utility model patent CN222136690U discloses a car bumper comprising a fixed base, a connecting plate, and a bumper housing. The fixed base is fixedly connected to the car via fasteners, and the bumper housing is fixedly connected to the connecting plate. The connecting plate is located between the fixed base and the bumper housing, and multiple spring shock absorbers are fixedly installed between the connecting plate and the fixed base. The two ends of each spring shock absorber are fixedly connected to the fixed base and the connecting plate, respectively. This application provides the bumper with a cushioning and protective function. Currently, most bumpers are made of plastic or thin steel. The disadvantage of plastic bumpers is that they are prone to cracking and damage when subjected to pressure or impact. The disadvantage of thin steel bumpers is that they have low strength and are prone to deformation. When deformed, local twisting causes end traction, which can cause the bumper to detach and loosen from the vehicle frame. At the same time, most bumpers have a simple structure, especially in the corner area, which is very easy to scratch due to the driver's lack of experience. Therefore, it is necessary to reinforce the corner area to improve the protection of the bumper against damage when driving by novice drivers. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a carbon fiber composite car bumper to solve the problems that traditional plastic or thin steel bumpers are prone to cracking, breakage, deformation and twisting when they are scratched or collided at low speeds. At the same time, a single bumper is prone to a high damage rate when it comes into frequent contact with objects due to improper operation by novice drivers.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a carbon fiber composite car bumper, including a main bumper assembly, an inner support assembly for the main bumper assembly is provided on the inner side of the main bumper assembly, and an auxiliary bumper assembly is provided on the outer side of the main bumper assembly;

[0006] The main bumper assembly includes the bumper body;

[0007] The main bumper inner support assembly includes a corner inner support block;

[0008] The auxiliary bumper assembly includes a mounting base, a connecting bracket, and a protective bar.

[0009] Furthermore, the bumper body has a U-shaped structure, and the end of the bumper body is provided with a right-angle bend. The surface of the right-angle bend has several mounting holes that penetrate through it along the upper and lower positions. The inner wall surface of the mounting holes is a smooth surface or a threaded surface.

[0010] Furthermore, the bumper body sequentially comprises a base layer one, a reinforcement layer, a reinforcing frame, a puncture-resistant layer, a heat insulation layer, an impact-resistant layer, and a base layer two;

[0011] One side of base layer one is covered with a reinforcing layer, the other side of the reinforcing layer is equipped with a reinforcing frame, the other side of the reinforcing frame is covered with a puncture-resistant layer, the other side of the puncture-resistant layer is fitted with a heat insulation layer, the other side of the heat insulation layer is covered with an impact-resistant layer, and the other side of the impact-resistant layer is covered with base layer two.

[0012] Both base layer one and base layer two are made of carbon fiber plate, the reinforcing layer is made of thin aluminum alloy plate, the reinforcing frame is made of stainless steel frame, the puncture-resistant layer is made of glass fiber material, the heat insulation layer is made of polyurethane foam material, and the impact-resistant layer is made of polyester material.

[0013] Furthermore, the stainless steel frame includes several horizontal bars and several vertical bars. The horizontal bars are equidistantly distributed along the vertical position, and the two ends of the horizontal bars are provided with a curvature corresponding to the bumper body. The horizontal bars and vertical bars are fixed together through each other.

[0014] Furthermore, the surface of the heat insulation layer is distributed with several flame-retardant blocks, and the flame-retardant blocks are bonded and fixed to the surface of the heat insulation layer by resin adhesive. The flame-retardant blocks are made of aluminum hydroxide material.

[0015] Furthermore, the surface of the impact-resistant layer is provided with several strip grooves, and several buffer airbags are provided on the inner side of the base layer two. The buffer airbags are made of cylindrical hollow rubber material, and the surface of the buffer airbags fits into the inner side of the strip grooves.

[0016] Furthermore, the inner corner support block is set on the inner side of the bumper body and is symmetrically distributed along the two inner corners of the bumper body. The inner corner support block has a hollow hole inside, and several support rods are distributed on the inner side of the hollow hole.

[0017] An inner liner is provided between the inner support blocks of the bends distributed along both sides, and several central support plates are distributed on one side of the bumper body.

[0018] Furthermore, the mounting base is located on the outward side of the bumper body. Several mounting bases are provided, and any one of them is an integral structure with the base layer. The mounting base has a slot inside and a connecting frame. The connecting frame is L-shaped, and the horizontal end of the L-shape is provided with a vertically upward hook. The hook connects with the inside of the slot and is fixed to the slot by screws. Protective rods are provided on several connecting frames distributed in the same row. Two sets of protective rods are provided along the vertical position, and connecting rods are provided at the ends of the two vertically distributed protective rods.

[0019] The working principle and beneficial effects of this solution are as follows: 1. The bumper body of this solution uses carbon fiber plate as the base layer. Its high strength-to-weight ratio allows the bumper to efficiently absorb and disperse energy during a collision, while significantly reducing weight to optimize fuel economy. The reinforcement layer uses aluminum alloy plate to enhance rigidity and prevent dents from low-speed collisions. The grid structure of the stainless steel frame further provides core support to resist structural collapse under extreme impacts. The puncture-proof layer is made of glass fiber, which effectively blocks the penetration of sharp objects. The heat insulation layer and the impact-resistant layer achieve temperature isolation and kinetic energy absorption through polyurethane foam and polyester materials, respectively.

[0020] 2. As described in point 1, the design of the bumper's corner brace assembly and auxiliary protection frame significantly enhances local deformation resistance and ease of maintenance. The corner brace block adopts a triangular structure with built-in support rods, reinforcing the vulnerable corner areas of the bumper from the inside, effectively preventing torsional deformation caused by low-speed collisions. It is especially suitable for scenarios where novice drivers frequently scrape their vehicles. The combination of the inner liner and the central support plate further strengthens the frontal impact resistance, forming a comprehensive internal support network. The auxiliary bumper assembly provides additional protection through detachable connecting brackets and protective rods. Its frame structure can be flexibly installed or removed as needed, reducing weight during daily driving and enhancing protection under complex road conditions.

[0021] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the distribution of the various mechanisms in the embodiment;

[0023] Figure 2 A top view schematic diagram of the overall structure of a car bumper as shown in the embodiment;

[0024] Figure 3 This is a schematic diagram of the overall front view of a car bumper as shown in the embodiment.

[0025] Figure 4 This is a schematic diagram of the bumper body structure in an embodiment.

[0026] Figure 5 This is a schematic diagram of the reinforcing frame structure for an embodiment;

[0027] Figure 6 This is a schematic diagram of the insulation layer structure in an embodiment;

[0028] Figure 7 This is a schematic diagram of the second-level base structure in an embodiment.

[0029] The following labels are used in the attached diagram: 1. Main bumper assembly; 2. Main bumper inner support assembly; 3. Auxiliary bumper assembly; 10. Bumper body; 11. Mounting hole; 12. Right angle bend; 101. Base layer one; 102. Reinforcement layer; 103. Reinforcing frame; 104. Puncture-resistant layer; 105. Heat insulation layer; 106. Impact-resistant layer; 107. Base layer two; 10301. Horizontal bar; 10302. Vertical bar; 10501. Flame retardant block; 10601. Strip groove; 10701. Buffer airbag; 20. Corner inner support block; 21. Hollow hole; 22. Support rod; 23. Inner liner plate; 24. Central support plate; 30. Mounting seat; 31. Connecting frame; 32. Protective rod; 33. Connecting rod. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation methods:

[0031] Example

[0032] like Figures 1 to 7 As shown, a carbon fiber composite car bumper is disclosed, including a main bumper assembly 1, an inner main bumper support assembly 2 is provided on the inner side of the main bumper assembly 1, and an auxiliary bumper assembly 3 is provided on the outer side of the main bumper assembly 1.

[0033] The main bumper assembly 1 includes a bumper body 10;

[0034] The main bumper inner support assembly 2 includes a corner inner support block 20;

[0035] The auxiliary bumper assembly 3 includes a mounting base 30, a connecting bracket 31, and a protective rod 32;

[0036] The bumper body 10 has a U-shaped structure, and a right-angle bend 12 is provided at the end of the bumper body 10. The bumper body 10 fits into the front end of the vehicle frame. The right-angle bend 12 can fit into the frame members. The inner and outer surfaces of the right-angle bend 12 are curved, which increases the streamlined appearance of the bumper body 10. When the bumper body 10 is installed with the vehicle frame, the installation point can be hidden inside the vehicle body through the right-angle bend 12. This is not only aesthetically pleasing, but also avoids damage to the connecting parts due to exposure. The surface of the right-angle bend 12 has several through-holes 11 along the upper and lower positions. The inner wall surface of the mounting holes 11 is smooth or threaded, which can provide a stable fit with bolts or screws when the bumper body 10 is installed with the vehicle frame.

[0037] The bumper body 10 sequentially includes a base layer 101, a reinforcing layer 102, a reinforcing frame 103, a puncture-resistant layer 104, a heat insulation layer 105, an impact-resistant layer 106, and a base layer 2 107. One side of the base layer 101 is covered with the reinforcing layer 102, the other side of the reinforcing layer 102 is fitted with the reinforcing frame 103, the other side of the reinforcing frame 103 is covered with the puncture-resistant layer 104, the other side of the puncture-resistant layer 104 is fitted with the heat insulation layer 105, the other side of the heat insulation layer 105 is covered with the impact-resistant layer 106, and the other side of the impact-resistant layer 106 is covered with the base layer 2 107. Both the base layer 101 and the base layer 2 107 are made of carbon fiber plates, the reinforcing layer 102 is made of thin aluminum alloy plate, the reinforcing frame 103 is a stainless steel frame, the puncture-resistant layer 104 is made of fiberglass, the heat insulation layer 105 is made of polyurethane foam, and the impact-resistant layer 106 is made of polyester.

[0038] Carbon fiber panels boast an extremely high strength-to-weight ratio, with tensile strength more than five times that of steel and a density only one-quarter that of steel. In the bumper, the carbon fiber base layer effectively absorbs and disperses collision energy, reducing body deformation and significantly lowering overall weight, thereby improving fuel economy and handling agility. Furthermore, carbon fiber exhibits excellent corrosion resistance and fatigue resistance, maintaining structural stability over the long term and avoiding performance degradation caused by rust or aging of traditional metal materials. Aluminum alloy panels combine lightweight and high strength, serving as a reinforcing layer to further enhance bumper rigidity and prevent denting deformation during low-speed collisions. Aluminum alloys have good ductility, absorbing some energy through plastic deformation under stress, and their oxidation resistance is superior to ordinary steel, resisting corrosion even after prolonged exposure to humid environments. The stainless steel frame provides the core support structure of the bumper; its high yield strength and creep resistance ensure structural stability under extreme impacts. Stainless steel's corrosion resistance far exceeds that of ordinary carbon steel, especially in rain, snow, or de-icing agent environments. To prevent strength loss due to corrosion, the mesh or honeycomb design of the reinforcing frame further disperses impact force while reducing weight. In side or offset collisions, the stainless steel frame effectively resists lateral shear forces, preventing the bumper from breaking and detaching, thus protecting pedestrians or oncoming vehicles. The fiberglass layer forms a tough barrier through an interwoven fiber network, effectively preventing flying gravel, metal fragments, or other sharp objects from piercing the bumper. Its high tensile strength and low elongation characteristics allow it to quickly disperse stress during localized impacts, preventing crack propagation. Fiberglass has good chemical stability, is resistant to acids, alkalis, and ultraviolet rays, and is not prone to aging over long-term use. The closed-cell structure of polyurethane foam gives it excellent thermal insulation properties, preventing the high temperatures from the engine compartment or exhaust system from being conducted to the outer surface of the bumper, avoiding burns to pedestrians or deformation of plastic parts. Polyester material has high toughness and resilience. During high-speed collisions, it dissipates kinetic energy through the stretching and breaking of molecular chains, reducing secondary injuries to occupants from rebound forces. Its wear resistance and crack propagation resistance are superior to ordinary plastics, and it is not prone to embrittlement over long-term use.

[0039] The stainless steel frame 103 includes several horizontal bars 10301 and several vertical bars 10302. The horizontal bars 10301 are equidistantly distributed along the vertical position, and the two ends of the horizontal bars 10301 are provided with a bending arc corresponding to the bumper body 10. The horizontal bars 10301 and the vertical bars 10302 are fixed together through a grid, forming a grid-like frame structure, which can improve the overall deformation resistance when the bumper body 10 is in use.

[0040] The surface of the heat insulation layer 105 is covered with a plurality of flame-retardant blocks 10501. The flame-retardant blocks 10501 are bonded to the surface of the heat insulation layer 105 with resin adhesive. The flame-retardant blocks 10501 are made of aluminum hydroxide and are densely distributed. Since the heat insulation layer 105 is made of polyurethane foam, the embedding of flame-retardant particles on the surface of the polyurethane foam board can significantly improve the fire safety performance of the material, making it suitable for car bumpers. The flame-retardant blocks 10501 made of aluminum hydroxide will decompose and release inert gas at high temperatures, forming a heat-insulating carbon layer. This effectively slows down the spread of flames and reduces the burning rate. At the same time, this embedding process avoids the problem of easy detachment of traditional sprayed flame retardants, ensuring long-term stability of flame retardant performance. The addition of flame retardant block 10501 will not significantly affect the lightweight, heat insulation and sound absorption properties of polyurethane foam. In automotive bumper applications, this design can reduce the risk of fire caused by electrical short circuits or high temperatures in the exhaust system, and improve the safety of the entire vehicle. Compared with the overall mixing of flame retardants, surface embedding can precisely control the distribution of flame retardants, avoid excessive addition that leads to a decline in the mechanical properties of materials, and balance safety and structural strength.

[0041] The surface of the impact-resistant layer 106 is provided with several strip grooves 10601. Several buffer airbags 10701 are provided on the inner side of the base layer 107. The buffer airbags 10701 are made of cylindrical hollow rubber material. The connection between the buffer airbags 10701 and the base layer 107 is fixed by resin adhesive. The surface of the buffer airbags 10701 fits into the inner side of the strip grooves 10601, which can ensure that the position of the buffer airbags 10701 relative to the base layer 107 is stable during long-term vehicle movement. At the same time, the size of the buffer airbags 10701 is twice the size of the strip grooves 10601, which facilitates the positioning of the buffer airbags 10701 and also avoids the buffer airbags 10701 losing their buffering effect due to complete enclosure.

[0042] The inner corner support block 20 has a triangular structure. One apex of the inner corner support block 20 is set with an arc-shaped angle, which matches the inner angle of the bumper body 10. The inner corner support block 20 is set on the inner side of the bumper body 10 and is symmetrically distributed along the two inner corners of the bumper body 10. The connection between the inner corner support block 20 and the bumper body 10 is fixed by screws. The inner corner support block 20 has a hollow hole 21 inside. Several support rods 22 are distributed inside the hollow hole 21. The two ends of the support rods 22 are welded and fixed to the inner wall of the hollow hole 21. The inner corner support block 20 can support the corner area of ​​the bumper body 10 that is prone to collision deformation during use. It can prevent twisting deformation during low-speed impacts, further improving its damage resistance and enhancing the bumper body 10's overall performance. For novice drivers, this reduces the need for repairs due to frequent scratches and deformation of the bumper body 10. An inner liner 23 is installed between the inner corner support blocks 20 distributed along both sides. The two ends of the inner liner 23 are fixed to the surface of the inner corner support blocks 20 with screws. Several central support plates 24 are distributed on one side of the inner liner 23. The end of the central support plate 24 away from the inner liner 23 is tightly attached to the surface of the bumper body 10. The central support plate 24 and the inner liner 23 are fixed with screws. The several central support plates 24 are equidistantly distributed vertically, providing anti-bending deformation protection against low-speed impacts to the front of the bumper body 10. Combined with the inner corner support blocks 20, this provides comprehensive internal support for the bumper body 10, improving its durability.

[0043] The mounting base 30 is located on the outward side of the bumper body 10. Several mounting bases 30 are provided, and any one of the mounting bases 30 and the base layer 107 are integrally formed. The mounting base 30 has a slot inside and a connecting frame 31. The connecting frame 31 is L-shaped, and its horizontal end is provided with a vertically upward hook. The hook connects with the inside of the slot and is fixed to the slot with screws. Several connecting frames 31 are arranged in the same row and are provided with protective rods 32. The connecting frame 31 and the protective rods 32 are fixedly installed through each other. Two sets of protective rods 32 are arranged along the vertical position. The two ends of the protective rods 32 are curved structures, and their curvature is the same as that of the bend of the bumper body 10. The ends of the two protective rods 32 are provided with connecting rods 33. The ends of the protective rods 32 and the connecting rods 33 are fixed with screws. The protective rods 32 and the connecting rods 33 form a frame structure, which can be used for additional installation when it is necessary to strengthen the protection of the bumper body 10.

[0044] In practice

[0045] The main bumper assembly 1 of this solution achieves lightweight and high-strength protection through a seven-layer composite structure. The base layer 101 and base layer 207 of the bumper body 10 are made of carbon fiber plates, utilizing their high specific strength characteristics as the core load-bearing layer. During a collision, energy is dispersed through fiber breakage. The thin aluminum alloy plate of the reinforcing layer 102 covers the outside of the base layer 101, absorbing low-speed collision kinetic energy through plastic deformation to prevent denting; its ductility can reduce the peak impact force. The stainless steel frame of the reinforcing frame 103 consists of horizontal bars 10301 and vertical bars 10302. A grid structure is formed to resist shear forces during high-speed collisions and prevent overall breakage. The glass fiber of the puncture-resistant layer 104 blocks sharp objects from penetrating through an interwoven network, while inhibiting crack propagation. The polyurethane foam of the heat insulation layer 105, combined with the aluminum hydroxide flame-retardant block 10501, not only blocks the transmission of high engine temperatures but also achieves fire prevention by decomposing inert gases. The polyester material of the impact-resistant layer 106 works synergistically with the buffer airbag 10701 in the strip groove 10601 to absorb energy secondaryly by stretching molecular chains and deforming rubber airbags, thereby reducing the impact load on the occupant compartment.

[0046] The inner corner support block 20, with its triangular structure and arc angle, fits tightly against the inner corner of the bumper body 10, reinforcing the weak area of ​​the right-angle bend 12 from the inside. Its internal hollow hole 21 and support rod 22 form a lightweight truss, which resists torsional deformation through the axial force of the support rod 22 during low-speed lateral collisions, preventing the right-angle bend 12 from cracking. The symmetrically distributed inner corner support blocks 20 are connected by the inner lining plate 23 to form a lateral stability frame. The central support plate 24 is evenly distributed vertically along the inner lining plate 23, decomposing the frontal impact force into multiple fulcrum loads and transferring them to the vehicle frame.

[0047] Mounting base 30 and base layer 2 107 are integrally formed to ensure that there is no stress concentration when the L-shaped hook of connecting frame 31 is connected to the slot. The protective rod 32 forms a parallel barrier through two sets of distribution, and its end bending structure is consistent with the curvature of the bumper body 10. In an offset collision, it guides the legs of the other vehicle or pedestrian to slide and reduces local pressure. The connecting rod 33 connects the ends of the two protective rods 32 to form a closed frame, which improves the overall bending stiffness. When subjected to high-speed impact, the protective rod 32 absorbs energy through its own deformation, and at the same time transmits the remaining impact force to the mounting base 30 through the connecting frame 31, where it is dissipated secondary by the multi-layer structure of the main bumper assembly 1.

[0048] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A carbon fiber composite material automobile bumper, characterized by: It includes a main bumper assembly, an inner support assembly for the main bumper assembly is provided on the inner side of the main bumper assembly, and an auxiliary bumper assembly is provided on the outer side of the main bumper assembly; The main bumper assembly includes the bumper body; The main bumper inner support assembly includes a corner inner support block; The auxiliary bumper assembly includes a mounting base, a connecting bracket, and a protective bar.

2. A carbon fiber composite vehicle bumper according to claim 1, characterized in that: The bumper body has a U-shaped structure, and the end of the bumper body is also provided with a right-angle bend. The surface of the right-angle bend has several mounting holes that penetrate through it along the upper and lower positions. The inner wall surface of the mounting holes is smooth or threaded.

3. A carbon fiber composite car bumper according to claim 2, characterized in that: The bumper body comprises, in sequence, a base layer one, a reinforcement layer, a reinforcing frame, a puncture-resistant layer, a heat insulation layer, an impact-resistant layer, and a base layer two; One side of base layer one is covered with a reinforcing layer, the other side of the reinforcing layer is equipped with a reinforcing frame, the other side of the reinforcing frame is covered with a puncture-resistant layer, the other side of the puncture-resistant layer is fitted with a heat insulation layer, the other side of the heat insulation layer is covered with an impact-resistant layer, and the other side of the impact-resistant layer is covered with base layer two. Both base layer one and base layer two are made of carbon fiber plate, the reinforcing layer is made of thin aluminum alloy plate, the reinforcing frame is made of stainless steel frame, the puncture-resistant layer is made of glass fiber material, the heat insulation layer is made of polyurethane foam material, and the impact-resistant layer is made of polyester material.

4. A carbon fiber composite car bumper according to claim 3, characterized in that: The stainless steel frame includes several horizontal bars and several vertical bars. The horizontal bars are equidistantly distributed along the vertical position, and the two ends of the horizontal bars are provided with a curvature corresponding to the bumper body. The horizontal bars and vertical bars are fixed together through each other.

5. A carbon fiber composite car bumper according to claim 4, characterized in that: The surface of the heat insulation layer is distributed with several flame-retardant blocks. The flame-retardant blocks are bonded to the surface of the heat insulation layer with resin adhesive. The flame-retardant blocks are made of aluminum hydroxide.

6. A carbon fiber composite car bumper according to claim 5, characterized in that: The surface of the impact-resistant layer has several strip grooves, and the inner side of the base layer has several buffer airbags. The buffer airbags are made of cylindrical hollow rubber material, and the surface of the buffer airbags fits into the inner side of the strip grooves.

7. A carbon fiber composite car bumper according to claim 6, characterized in that: The inner corner support block is set on the inner side of the bumper body and is symmetrically distributed along the two inner corners of the bumper body. The inner corner support block has a hollow hole inside, and several support rods are distributed on the inner side of the hollow hole. An inner liner is provided between the inner support blocks of the bends distributed along both sides, and several central support plates are distributed on one side of the bumper body.

8. A carbon fiber composite car bumper according to claim 7, characterized in that: The mounting base is located on the outward side of the bumper body. Several mounting bases are provided, and any one of them is an integral structure with the base layer. The mounting base has a slot inside and a connecting frame. The connecting frame is L-shaped, and the horizontal end of the L-shape is provided with a vertically upward hook. The hook connects with the inside of the slot and is fixed to the slot by screws. Protective rods are provided on several connecting frames distributed in the same row. Two sets of protective rods are provided along the vertical position, and connecting rods are provided at the ends of the two vertically distributed protective rods.

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