64results about How to "Guaranteed protective effect" patented technology

This utility model discloses a chassis protection frame in the field of personal mobility scooter technology, including a chassis, a mounting frame on the underside of the chassis, a mounting groove on the outer side of the mounting frame, multiple sets of protective frames inside the mounting groove, two sets of positioning blocks fixedly mounted on the upper side of each set of protective frames, and two positioning grooves for mating the positioning blocks on the upper side of the mounting groove. The positioning blocks are movably inserted into the positioning grooves. Mounting holes are provided through the outer sides of the mounting frame and positioning blocks, and fixing rods are movably inserted into the inner side of the mounting holes. The outer sides of the fixing rods, located on both sides of the mounting frame, are provided with threaded surfaces, and locking nuts are threaded onto the outer sides of both sets of threaded surfaces. This utility model, through its simple installation structure, facilitates the assembly and disassembly of the protective frame, improves the ease of installation and disassembly, reduces workload, and increases work efficiency. Furthermore, it allows for easy replacement of damaged parts, effectively reducing maintenance costs and avoiding resource waste. Its practical effect is excellent and worthy of promotion and use in the current market.

The embodiment of the present specification provides a kind of vehicle driver frontal protection air bag device, including first air bag and second air bag independent of each other, first air bag is arranged in vehicle steering wheel, second air bag is arranged in the corresponding vehicle roof area of instrument panel or driving position, when vehicle is impacted to reach the set threshold value, first air bag and / or second air bag are unfolded, and extend to the space between steering wheel and driver, wherein, when first air bag and second air bag are unfolded simultaneously, first air bag and second air bag are mutually supported and present profiling clamping state.By setting first air bag and second air bag independent of each other, the first air bag of protection driver thoracic cavity part is arranged in steering wheel, the second air bag of protection driver head and neck is arranged in instrument panel or vehicle roof area, can reduce the space occupied by steering wheel, according to the situation that vehicle is impacted, first air bag and / or second air bag are unfolded, can realize the optimal protection scheme to driver.

The adjustable slag collecting device is modular in design and mainly consists of a slag collecting device and a support assembly. The slag collecting device includes a slag collecting barrel and a fixed support. The collecting barrel is made of high-temperature resistant metal material. The support assembly includes a movable support, a bolt and a fixed bolt. The support assembly can be quickly positioned and adjusted in height according to the use requirements, has the characteristics of quick installation, multi-stage adjustment and safety protection, and is suitable for vertical welding operations in building steel structures, power facilities and industrial pipeline construction. Through the synergistic effect of the mechanical adjusting support and the yellow sand buffer layer, the device effectively solves the problems of insufficient adaptability, poor fireproof performance and secondary spatter of welding slag in the traditional protection mode in the dynamic welding environment, can significantly reduce the equipment damage and fire risk caused by the falling of high-temperature welding slag, and improves the safety and efficiency of welding operation.

The present application relates to the technical field of ceramic coating, especially to a micro-nano structure ceramic coating and its application on the reaction furnace of zircon sand boiling chlorination method, aiming at solving the problems of weak bonding force between the existing protective coating and the substrate, poor thermal shock resistance and easy failure in long-term high-temperature chlorine environment; the present application constructs a nano-wire reinforced micro-nano structure transition layer on the surface of porous corundum brick substrate in situ, and sequentially constructs a lanthanum phosphate bonding layer and a yttrium stabilized zirconium oxide barrier layer on the transition layer; the design utilizes the mechanical anchoring effect of micro-nano structure and the strong chemical bonding ability of lanthanum phosphate to realize the firm combination of the coating and the substrate; the dense characteristics of the zirconium oxide layer provide ultimate protection; the method significantly improves the overall anti-peeling ability and long-term corrosion resistance of the coating system.

An electric hoist with a fall-prevention structure effectively solves the problem of the risk of electric hoist falling. It includes a track, an electric trolley, and a hoist body. The hoist body is equipped with protective devices located on the front and rear sides of the electric trolley. Each protective device includes a frame, which is fixedly connected to the hoist body. A rotating shaft is mounted on the frame, and a first screw and a second screw with opposite thread directions are coaxially fixed to the rotating shaft. The first screw is threadedly connected to a first nut, and a first frame is fixed to the upper end of the first nut. A first roller in contact with the track is rotatably connected to the lower end of a first positioning plate. Multiple third screws are fixed to the lower end of the first frame, inserting vertically into the interior of the first frame. A second screw is threadedly connected to a second nut, and a second frame is fixed to the upper end of the second nut. A second roller in contact with the track is rotatably connected to the lower end of a second positioning plate. Multiple fourth screws are fixed to the lower end of the second frame, inserting vertically into the interior of the second frame.

The utility model discloses a multi-channel wavelength division multiplexing optical receiving device, including device main part, its outside is equipped with a plurality of protection components, and the detachable connection between protection components and device main part, be equipped with the limiting component for limiting a plurality of protection components on device main part, device main part includes wavelength division multiplexer body, and the one side of wavelength division multiplexer body is installed with a plurality of terminal ends, and protection components and terminal ends are set up one -to -one correspondence, through with the geographical modularization design of protection components, make every terminal end have independent protection components, more flexible protection each terminal end, therefore, can open or close a certain terminal end alone, and do not influence other terminal ends, to guarantee the protection of every terminal end and the convenience of operation, simultaneously, protection components and device main part adopt detachable connection, can when a certain protection component is damaged, corresponding protection components are dismantled and replaced, to reduce maintenance cost.

This utility model provides a furnace-front propulsion device for the production and processing of wheel parts, belonging to the field of wheel part manufacturing technology. It includes a frame, with an electric heating furnace fixed to one end of the upper surface of the frame and a fixed frame fixed to the other end. A track for sliding wheel parts is provided between the fixed frame and the bottom of the electric heating furnace. A propulsion cylinder is detachably mounted on the fixed frame, with its piston rod facing the electric heating furnace and a push plate for pushing the wheel parts fixed thereon. A horizontally movable frame is provided on the lower surface of the frame, housing a control box. A vertical rotating cylinder is fixed to the top of the movable frame, with its top end protruding from the upper surface of the frame. This utility model not only solves the problem of high safety hazards associated with manual pushing in existing systems, but also offers flexible installation of the cylinder control box, low space occupancy in the workshop, low risk of damage, and good overall performance.

This invention relates to a handling robot, and more particularly to a handling robot with autonomous center of gravity adjustment capability. It includes a robot body, a steering component rotatably connected to the robot body, an electric slide rail fixedly connected to the steering component, a clamping component connected to the slider of the electric slide rail, and two opposing fixed plates fixedly connected to the robot body. This invention uses a pressure sensor to monitor the load in real time and drives a linear motor to move the battery compartment horizontally, achieving dynamic autonomous adjustment of the center of gravity. This effectively counteracts the overturning torque caused by heavy loads or high lifting, improving operational safety and stability. Simultaneously, it innovatively introduces a mechanical linkage mechanism that combines a Z-shaped guide groove with a lifting frame, allowing the rollers to be suspended in the air under normal conditions and automatically lowered as the battery compartment moves. This, combined with the energy absorption of a first spring, avoids unnecessary frictional wear while also providing shock absorption and protection.

The application provides a plug connector with printed board fixing and protection components, relates to the technical field of connectors, and comprises a plug, a printed board and printed board fixing and protection components. The tail end of a contact in the plug is welded with the printed board in a plug-in manner. The printed board fixing and protection components are wrapped outside the printed board and are detachably connected with the tail end of the plug. The printed board fixing and protection components comprise a fixing box, printed board fixing screws, a sealing washer, cover plate fixing screws and a cover plate. The head of the fixing box is provided with a threaded structure. A plurality of threaded holes A are arranged on the tail end face of the fixing box. The sealing washer is arranged between the fixing box and the cover plate. The cover plate fixing screws pass through the cover plate and the sealing washer and are arranged in cooperation with the threaded holes A, so that the cover plate seals and fixes the tail end of the fixing box. A plurality of threaded holes B are arranged in the fixing box. The threaded holes B cooperate with the printed board fixing screws to fix the printed board, so that the printed board is fixed, connected and protected.

The application discloses a servo drive hydraulic grab bucket system and grab bucket for a large crane and belongs to the technical field of cranes. The servo drive hydraulic grab bucket system for the large crane comprises an oil tank for storing hydraulic oil and a hydraulic control system, the oil tank is communicated with the hydraulic control system through a hydraulic pipeline and forms a closed circulating oil path, and the hydraulic control system comprises: a hydraulic cylinder body connected with the grab bucket; a hydraulic pump group composed of a constant-power variable pump driven by a servo motor, an oil inlet of the hydraulic pump group being connected with the oil tank through the hydraulic pipeline and an oil outlet of the hydraulic pump group being connected with a hydraulic pump head valve group; and the hydraulic pump head valve group comprising an electromagnetic ball valve, an input end of the electromagnetic ball valve being connected with an output end of the hydraulic pump group and an output end of the electromagnetic ball valve being connected with an oil inlet of a control valve group. The servo drive hydraulic system is utilized to realize linear and continuous change of the working speed of the super-large grab bucket through double-variable control, and the stability, working life and working efficiency of the working system are effectively improved.

The utility model discloses a kind of building steel structure revetment structures, including multiple mutually butting steel structure revetment mechanisms, four corner places in each steel structure revetment mechanism are fixedly provided with reinforcing mechanism, the adjacent place of four steel structure revetment mechanisms is provided with first connecting assembly, the adjacent place of two steel structure revetment mechanisms is provided with second connecting assembly, the outside of each steel structure revetment mechanism is provided with intercepting net board, steel structure revetment mechanism includes steel structure frame, four corner places of steel structure frame top are all provided with arc-shaped gap, each arc-shaped gap is all provided with circular butt joint groove, connecting screw hole is all provided in each circular butt joint groove. The utility model is connected after the butt joint of multiple steel structure revetment mechanisms, is connected by first connecting assembly and second connecting assembly respectively, while reinforcing each steel structure revetment mechanism by reinforcing mechanism, ensure the stability of overall revetment mechanism, guarantee that revetment structure whole is more firm, improve the function of revetment structure.

The utility model discloses a windshield assembly and vehicle, windshield assembly includes windshield subassembly and mounting bracket subassembly, windshield subassembly includes windshield and outer frame, and the outer frame is covered at the outer peripheral edge of windshield, and mounting bracket subassembly includes A column connecting plate and hinged part, and A column connecting plate is connected between left side A column roof beam and right side A column roof beam of vehicle and is located the top of frame, and hinged part is connected between A column connecting plate and the upper frame of outer frame. The utility model discloses windshield assembly utilize outer frame to protect windshield, strengthen structural strength, and hinged part is directly connected with outer frame, will not destroy windshield's own structure, avoids its direct stress, to make windshield can guarantee the protection effect under the bad driving environment, improves the driving safety.

The utility model discloses a kind of sealing protective cover of charging socket, including protective cover assembly, lock catch assembly, protective cover pin shaft, socket shell, insulator fixed bolt, insulator assembly, functional assembly, fixed plate screw, protective cover assembly is fixed in socket shell front by protective cover pin shaft, lock catch assembly is fixed and locked protective cover assembly in socket shell front, insulator assembly is fixed in socket shell back by insulator fixed bolt, functional assembly is fixed in insulator by fixed plate screw installation.The utility model is simple in structure, convenient to maintain, by upper protective cover end surface sealing and lower protective cover radial sealing collocation in protective cover assembly, effectively improve the protection level of charging socket, enhance the sealing performance of charging interface, can guarantee interface protection, not easy to water and dust, guarantee the protection effect of charging interface, effectively guarantee stable electrical connection and charging connection, enhance the safety of electric automobile under charging state.

The application relates to the technical field of injection molding machines, and particularly discloses an injection molding machine facilitating the discharging of automobile interior forming pieces, which comprises a machine body, a shell is arranged on the top of the machine body, a movable mold and a static mold are arranged in the shell, a discharging port is arranged on the top of the machine body, a cavity is arranged in the machine body, a discharging mechanism is arranged in the cavity, the discharging mechanism comprises a second moving plate, two clamping plates are arranged on the top of the second moving plate, and auxiliary guide mechanisms are arranged on the outer walls of the two clamping plates. In the application, the discharging mechanism can guide, limit and buffer the cooled and formed parts, prevents the parts from being directly impacted against the inner wall of the machine body to cause bruising, has a protection effect on the formed parts, and can indirectly improve the yield of the injection-molded parts. The damage rate of the parts is reduced, the recycling and remolding of damaged parts are reduced as much as possible, the new plastic raw materials or recycled defective plastic raw materials can be fully utilized, and good injection molding quality is ensured.

The invention relates to the technical field of assembling equipment, in particular to an assembling device and automatic assembling equipment thereof.The assembling device comprises an expansion sleeve, the outer diameter of the expansion sleeve is gradually increased from the top end to the bottom end, the expansion sleeve is used for being sleeved with a rubber ring, and the outer diameter of the bottom end of the expansion sleeve is larger than the inner diameter of the rubber ring; the bearing mechanism is provided with at least two bearing assemblies, one bearing assembly is used for bearing the capacitor, and the other bearing assembly is used for bearing the expansion sleeve; the press-fitting mechanism comprises a transmission assembly and a press-fitting assembly, the press-fitting assembly is provided with a press-fitting channel with an opening in the bottom, the expansion sleeve sleeved with the rubber ring is stored in the press-fitting channel, the rubber ring is pushed to the position close to the bottom end of the expansion sleeve, and then the press-fitting assembly moves to the position right opposite to the capacitor along with the transmission assembly. The capacitor press-fitting device has the advantages that the assembling difficulty of the capacitor and the rubber ring is greatly reduced, and the assembling efficiency and the assembling quality are remarkably improved.

The utility model discloses a kind of electric power transformers with insulation protective structure, including transformer body, the transformer body output is equipped with insulation protective sleeve, the insulation protective sleeve includes sleeve body, the side above of opening and closing gap is equipped with first skirt, the side above of opening and closing gap is equipped with second skirt, the middle part of mutually close side of first skirt and second skirt is equipped with mounting groove, sealing strip is equipped in the mounting groove, the first skirt and the upper end of second skirt are equipped with the first through-hole of multiple equidistance arrangement, second through-hole matched with first through-hole is opened in the sealing strip, the first through-hole and the second through-hole inside are inserted with connecting component. This kind of structure is simple, easy to install, sealing effect is good, with good insulation effect, can effectively avoid dust and rainwater easily from gap into insulation protective cover inside, guarantee the protection effect and insulation performance of insulation shield.

This utility model discloses a double-groove bracket, including a bracket metal body and a first plastic layer. At least one first metal groove is provided on the front side of the bracket metal body. The first plastic layer is injection molded onto the edge region of the front side of the bracket metal body, so that a plastic groove is formed in the center of the first plastic layer. Several second partition strips are provided within the plastic groove, dividing the first metal groove into several independent groove regions. An LED blue light chip is fixed in one of the groove regions, and phosphor is laid in the groove region corresponding to the LED blue light chip. The remaining groove regions only have LED chips fixed in them. This utility model can both excite phosphor to emit white light using an LED blue light chip and generate white light by mixing LED chips of various primary colors. In this way, different light emission methods can be selected for different scenarios with low and high color temperatures, effectively improving the energy efficiency of the LED lighting system.

The utility model discloses a tantalum capacitor shell packaging structure that improves mechanical strength relates to tantalum capacitor shell packaging technical field, including outer layer packaging shell and middle layer packaging shell, the inside of outer layer packaging shell is provided with middle layer packaging shell, and the inside of middle layer packaging shell is provided with inner layer packaging shell, and the top surface of outer layer packaging shell is provided with first reinforcing rib, and the left and right sides of outer layer packaging shell all are provided with second reinforcing rib. This tantalum capacitor shell packaging structure that improves mechanical strength, through being provided with the outer layer packaging shell of layer -by -layer nesting structure, middle layer packaging shell, inner layer packaging shell, utilize the cooperation of the structure between three, can provide structural protection for internal component as far as possible, to guarantee the operation stability of whole, cooperate the structural setting of base, first reinforcing rib and second reinforcing rib, can further guarantee the mechanical strength of whole packaging structure like this.

This application proposes a high-intensity tri-proof lamp comprising a lamp body, a heat sink, and a light source plate. The lamp body is co-extruded from a diffusing material and an opaque material, and has a diffuser cover. The inner surface of the diffusing material portion of the diffuser cover forms a serrated light-controlling structure. The light source plate is disposed within the lamp body. The light source plate is disposed within the lamp body, located on the heat sink, and facing the diffuser cover. Through the structural design of the diffusing and opaque materials, the tri-proof lamp achieves excellent light control while still meeting the requirements for waterproofing, dustproofing, and corrosion resistance.

The utility model relates to wire and cable manufacturing technical field discloses a kind of cable armoring cable forming device of lateral deviation when preventing stranding, including support disc, the left and right sides of support disc are all provided with multiple sliding slots, and the inside of support disc is provided with cavity, the inner wall right side of support disc is fixedly connected with motor, the driving end of motor is fixedly connected with carousel, the left and right sides of carousel are all rotatably connected with multiple connecting rods, the other end of connecting rod is rotatably connected with slider, the inner wall of slider is fixedly connected with the bunching tube sliding in the inside of sliding slot, the bottom of support disc is installed with support sliding assembly, the top middle part of support sliding assembly is installed with stranding assembly, the top left side of support sliding assembly is installed with armoring machine. In the utility model, motor, carousel etc. in support disc are driven in coordination with bunching tube, different tension wire silk is applied with different tension, tension is balanced, lateral deviation when stranding is avoided, precision and quality are improved.

This invention provides a water hammer prediction system and device. The invention relates to the field of pipeline fluid transport safety technology. The water hammer prediction system is configured to: acquire static topology and physical attribute information and multi-dimensional real-time operating condition data of the fluid transport system, and pre-calibrate a dynamic simulation model based on the information and data; when a water hammer triggering event is detected, invoke the pre-calibrated dynamic simulation model to perform an initial prediction to generate an initial prediction result, and issue a pre-control command to the first-level protection device based on the initial prediction result; acquire the measured impact index at the first-level protection device and compare it with the initial prediction result to determine the prediction error; and, based on the prediction error, correct the dynamic simulation model in real time, and drive the corrected dynamic simulation model to perform cascade control of the next-level protection device.

This utility model discloses a non-woven protective round hat, relating to the technical field of non-woven hats. The non-woven protective round hat includes a hat body and a brim. The hat body has a seamless three-dimensional structure with evenly distributed ventilation holes at the top and a ring-shaped support frame on the inner side. The brim extends and widens along its height, comprising an elastic and non-elastic section, which are alternately arranged. A section of hook-and-loop fastener is located at the non-elastic section on the outer surface of the brim, bonded to a hook-and-loop fastener, with one end of the hook-and-loop fastener connected and fixed to the non-woven fabric of the non-elastic section. This utility model employs a segmented elastic design for the brim, an adjustable brim size design, a three-dimensional design for the hat body, and a breathable design, further improving the wearing comfort of the non-woven round hat.

The application relates to the technical field of batteries and discloses a battery cell and a battery pack. The battery cell comprises a shell, an open end of the shell, a pole group arranged in the shell, the pole group comprising a positive pole sheet, a diaphragm and a negative pole sheet arranged in layers, the diaphragm extending out of the upper side walls of the positive pole sheet and the negative pole sheet, a battery cell cover plate assembly comprising a cover plate and a lower plastic, the cover plate being arranged on the open end, the lower plastic being arranged on the lower surface of the cover plate and in the shell, the lower surface of the lower plastic being provided with a separation part and a pair of limiting parts, the pair of limiting parts being respectively arranged at opposite ends of the lower surface of the lower plastic, the separation part being arranged between the pair of limiting parts, the end area of the separation part away from the cover plate being smaller than the end area of the limiting part away from the cover plate, the length of the separation part being smaller than the length of the limiting part, and the separation part and the limiting part both abutting against the part of the diaphragm extending out of the positive pole sheet and the negative pole sheet. The compression amount of the separation part on the diaphragm is reduced, and the possibility of damage of the separation part to the pole group is reduced.

The utility model discloses a novel isolator with double insulation protection relates to isolator field, including bearing plate, and the bearing plate one end is provided with fixed hole, and the bearing plate middle part is provided with connecting hole, and the bearing plate upper end is installed with insulating ceramic cover, and the insulating ceramic cover front end is installed with front end protection frame, and the insulating ceramic cover rear end is installed with rear end protection frame, and the insulating ceramic cover upper end is installed with stable platform, the utility model discloses a bearing plate, insulating ceramic cover, front end protection frame, rear end protection frame, left end contact plate, slide rail, support frame and movable connection platform are provided with, and the front end protection frame and rear end protection frame installed in the device can all -round shielding protection to insulating ceramic cover, and the device can be lifted movable connection platform through support frame when not connecting, and left end contact plate and right end contact plate are disconnected, make the whole novel isolator have the effect of double insulation protection.

The utility model relates to electronic access control technical field discloses a kind of power shell, access control power supply and access control system, the power shell includes: upper shell includes upper bottom plate and first upper side plate, second upper side plate;Lower shell includes lower bottom plate, first lower side plate, second lower side plate;The first end of first upper side plate, the second end of second upper side plate are rotatably connected with first lower side plate respectively by connecting shaft, to supply upper shell can be relative to lower shell and be turned over open and close;The third end of first upper side plate and the fourth end of second upper side plate are equipped with clamping part, second lower side plate is equipped with cooperation part, when upper shell and lower shell are in closed state, clamping part is embedded in cooperation part and forms fixed locking.This utility model embodiment is rotated by setting connecting shaft to open and close upper shell and lower shell, and cooperation part and clamping part are realized to be locked when upper shell and lower shell are closed, to solve the existing access control power supply in maintenance process The problem of many disassembly process steps, long time consumption, low efficiency.

The utility model provides a kind of roof wind shaft mouth anti-falling device, the device includes reel, winding assembly, anti-falling net and adjustable cover plate;Reel is equipped with accommodating space and is set to the opening in the middle part of reel length direction;Winding assembly includes winding roller and rocker, winding roller is rotatably set in accommodating space, rocker is set to reel outside, and is connected to winding roller;Anti-falling net one end is wound in winding roller, other end is connected to adjustable cover plate;Adjustable cover plate and opening buckle connection, and its length can be adjusted.The utility model is by being provided with reel and adjustable cover plate, not only make anti-falling net easy to store, anti-falling net can also be stably, conveniently fixed on roof wind shaft, the shape of anti-falling net can be limited simultaneously, to prevent its from being interwoven knot phenomenon when long time use, ensure the protection effect of anti-falling net.

The utility model relates to the technical field of side slope protection, disclose a side slope protection support for mine ecological restoration, including base and top protection subassembly, the top of base is fixedly connected with platform through support, the rotor end of drive motor is fixedly connected with screw rod and the bottom of screw rod is rotatably connected with base, the outside screw thread connection of screw rod has the moving block, the base is hinged with the fender, two groups of connecting rods are symmetrically hinged between the moving block and fender through hinge piece. The top protection subassembly includes two groups of symmetric fixed connection in the strip frame on the platform, the inside surface of two groups of strip frame is provided with same activity axle, the outside activity of activity axle is connected with frame and is hinged between frame and fender through hinge piece, the inside surface fixed connection of frame has steel wire net. The utility model effectively avoids the problem that the fallen stone is difficult to intercept, so that the planted vegetation can be damaged.

The utility model provides a special dialysis nursing bag for patient relates to nursing bag technical field, including the bag body and the bag cover, is provided with the bag cover on the top surface of bag body, evenly distributed setting has a plurality of horizontal cloth separator and vertical cloth separator in the bag body, it is perpendicular staggered setting between horizontal cloth separator and vertical cloth separator, and horizontal cloth separator and vertical cloth separator all are connected between the bag body, the top surface between horizontal cloth separator and vertical cloth separator all is connected with the cloth cover, the top surface of cloth cover is fixed with the clamping plate, and the clamping plate inserts has the label. Through the vertical distribution setting of horizontal cloth separator and vertical cloth separator, can realize in the bag body partial partition presents a plurality of independent placement space, the patient can place various articles for dialysis use respectively in the independent space, at this moment because the block of horizontal cloth separator and vertical cloth separator, can effectively reduce because the mutual influence between dialysis nursing articles, thereby ensure the protective property to dialysis nursing article.

The utility model provides an electric vehicle anticollision rear axle, including rear axle body still include: arc anticollision shell is located below rear axle body and the shape is compatible with rear axle body, support buffer assembly is located above rear axle body, including the group U of setting above rear axle body hangs board, the slide frame of being connected with each U hangs board and the bottom end of being connected with arc anticollision shell on each U hangs board and setting in U hangs board. Through the cooperation of setting support buffer assembly and arc anticollision shell, can stabilize arc anticollision shell below rear axle body, not only can form the protection to rear axle body, but also can avoid transmitting the impact force to rear axle body when being impacted, thereby guaranteeing the normal use of rear axle body, and the impact force buffering that arc anticollision shell received, effectively avoid its deformation breakage condition, further guarantee its effect of continuously protecting rear axle body.