267results about How to "Improve crash performance" patented technology

The invention relates to the technical field of crane control, in particular to an intelligent tower crane anti-collision accurate hoisting system based on multi-sensor fusion, which comprises a data acquisition module, a data processing module, a safety early warning module, a control execution module, a data processing module, a data processing module and a control module, an alarm module electrically connected with the safety early warning module and the data processing module and used for receiving the alarm signal sent by the safety early warning module; a hoisting control instruction is generated based on the alarm signal and the real-time three-dimensional position coordinates of the hoisted object sent by the data processing module; according to the method, the lifting control instruction is executed, the lifting arm angle, the rotation angle and the lifting height of the tower crane are adjusted, accurate lifting and anti-collision control are achieved, and the safety, accuracy and efficiency of the tower crane are comprehensively improved through organic combination of advanced technologies such as multi-sensor fusion, an intelligent algorithm and self-adaptive control.

The RFID antenna module comprises a shell, a metal shielding shell, a transmitting antenna, a cover plate and aluminum foil paper, a first mounting groove is formed in the upper portion of the shell in the width direction of the paper, a second mounting groove is formed in the upper surface of the metal shielding shell in the width direction of the paper, the metal shielding shell is mounted in the first mounting groove, and the transmitting antenna is mounted in the second mounting groove. The transmitting antenna is mounted in the second mounting groove, the cover plate is made of a non-metal material, covers the first mounting groove and is located on the outer side of the transmitting antenna, the aluminum-foil paper is attached to the inner end face of the cover plate, a through hole is formed in the aluminum-foil paper in a penetrating mode in the paper width direction, and the through hole is opposite to the transmitting antenna. According to the scheme, three-face metal shielding is utilized, the one-way emission performance of the antenna is improved, the antenna is suitable for ultra-near-field RFID identification, the anti-collision capacity of the tag is greatly improved, and the antenna has good one-way directivity.

The invention discloses a forecabin structure, a bearing type vehicle body and a vehicle, the forecabin structure comprises a longitudinal structure assembly, the longitudinal structure assembly comprises a longitudinal beam assembly, the longitudinal beam assembly comprises a first longitudinal beam and a second longitudinal beam, and the first longitudinal beam and the second longitudinal beam are spaced in the first direction and extend in the second direction; the torsion box is located at one end of the longitudinal beam assembly in the second direction; the other end, located in the second direction of the longitudinal beam assembly, of the first connecting piece is provided with the first connecting piece, and the first connecting piece is connected with the first longitudinal beam and the second longitudinal beam. The longitudinal beam assembly is arranged to be of the double-longitudinal-beam structure, the rectangular frame structure is formed in the forecabin structure, and the overall strength and rigidity of the forecabin structure can be improved. While the strength and the rigidity are improved, the arrangement requirements of a large tire, a short front overhang and a short L113 can be met.

The utility model provides a new energy anti-collision charging pile shell, and belongs to the technical field of charging piles. The new energy anti-collision charging pile shell comprises a charging pile body, and a fixing plate and a mounting seat which are arranged on the charging pile body. According to the anti-collision charging pile, when an automobile collides with the anti-collision assembly around the charging pile body, an automobile body makes soft contact with the air bag, meanwhile, the internal pressure intensity of the rubber air bag is increased while the rubber air bag is sunken, at the moment, air pressure abuts against the piston rod to move towards one end for buffering, and the piston rod drives the right-angle toothed rod on the outer side of the connecting base to move; a gear is matched to enable a positioning toothed bar to be separated from a limiting ring, a buffer spring is released, a fixing plate is matched with the buffer spring to further buffer an anti-collision assembly on a mounting base, and the situation that although a conventional anti-collision assembly can buffer the collision force, the collision force cannot be influenced is avoided. However, partial impact force between the anti-collision shell and the vehicle body can damage the vehicle body, so that the anti-collision effect is further improved, and the vehicle body and the charging pile body are effectively protected at the same time.

The invention discloses an unmanned aerial vehicle anti-collision structure, and relates to the technical field of unmanned aerial vehicles, the unmanned aerial vehicle anti-collision structure comprises a landing protection mechanism and a camera support mounted on the front side of the landing protection mechanism, the top of the landing protection mechanism is provided with an anti-collision mechanism, one side of the anti-collision mechanism is provided with a storage motor, and the landing protection mechanism comprises an unmanned aerial vehicle body. Landing rotating supports are fixedly installed on the periphery of the bottom of the unmanned aerial vehicle body, landing brackets are rotationally connected to the inner sides of the landing rotating supports, supporting connecting rods are fixedly installed at the bottoms of the two landing brackets, and a landing bottom plate is fixedly installed at the bottoms of the supporting connecting rods. And under the action of sliding connection between a buffering sliding rod and a buffering sliding sleeve, a third supporting rotating rod can drive the buffering sliding sleeve to extrude a third buffering spring while rotating, so that rotating adjustment of a second supporting rotating rod is achieved, and the device can adapt to road surfaces with different gradients.

The invention provides a collaborative robot man-machine interaction and anti-collision control method and device based on admittance, and relates to the technical field of robot intelligent control. The method comprises the following steps: acquiring control input force; according to the control input force, constructing a relationship between a state variable and control input in the man-machine interaction system; according to the relation, an expected admittance model and a soft saturation function are adopted, and a reference trajectory of the robot end effector is generated; according to the reference trajectory, an Actor-Critic algorithm is adopted, and a reinforcement learning neural network controller based on admittance control is designed; according to the reinforcement learning neural network controller based on admittance control, a control strategy in the man-machine interaction system is adjusted, and an anti-collision strategy in the man-machine interaction system is obtained. According to the invention, the safety and stability of the man-machine interaction system are improved.

The invention discloses an outdoor anti-collision electric vehicle charging pile, and relates to the technical field of electrical engineering, the outdoor anti-collision electric vehicle charging pile comprises a supporting plate, an anti-collision feedback mechanism is arranged on the outer ring of a line column, and a stability maintenance mechanism is arranged on the lower surface of the supporting plate; through cooperation of the collision body and a plurality of structures, when a vehicle accidentally gets close to the charging pile from different directions, the collision body is rotated to adjust the position in time for blocking, collision threats from all possible directions are effectively dealt with, the overall anti-collision performance of the charging pile is greatly improved, and the charging pile is more convenient to use in different charging sites. The vehicle entering and exiting modes and angles may be different due to parking space layout, channel directions and other factors, the arrangement of the rotary collision body can be flexibly rotated according to actual conditions, and the rotary collision body can adapt to various complex parking and charging scenes, for example, in a charging area of an inclined parking space, when a vehicle approaches a charging pile at an inclined angle, the vehicle can be driven to enter and exit from the charging pile. And the rotary anti-collision column can rotate to a proper position, so that vehicle collision is prevented, and the charging pile and the charged vehicle are better protected.

The utility model relates to the technical field of access control channel gates, and discloses an access control channel gate with an anti-collision structure, which comprises a case, an access control gate rod is rotatably arranged at the upper end of the rear side of the case and used for blocking vehicles, a rectangular frame is slidably arranged on the access control gate rod, a pressure sensor is arranged on the front surface of the rectangular frame, and the pressure sensor is arranged on the rear side of the rectangular frame. An anti-collision mechanism is arranged on the rectangular frame and used for protecting the access control brake bar, the anti-collision mechanism comprises four connecting blocks, four T-shaped rods, a protection plate and four springs, the four connecting blocks are symmetrically arranged at the upper end and the lower end of the rectangular frame respectively, the four T-shaped rods are arranged on the corresponding connecting blocks in a penetrating and inserting mode respectively, the protection plate is arranged on the same side of the four T-shaped rods, and the four springs are arranged on the protection plate. The protective cover is used for protecting the access control brake bar; when the anti-collision door control brake bar is used, a driver can be early warned in time when the door control brake bar is extruded by a vehicle, so that the vehicle cannot greatly extrude the door control brake bar, and the anti-collision performance of the door control brake bar is greatly improved.

The utility model discloses an anti-collision device for a cargo elevator, which belongs to the technical field of cargo elevators and comprises a cargo elevator car, a buffer plate is arranged in the cargo elevator car, fixing cylinders are fixedly connected to the back of the cargo elevator car, dampers are fixedly mounted on inner rings of the two fixing cylinders, two through holes are formed in the back of the cargo elevator car, and the two through holes are communicated with the buffer plate. The front ends of the two dampers penetrate through the through holes and extend into the cargo lift car, the front ends of the two dampers are fixedly connected with the back face of the buffer plate, two through openings are formed in the back face of the cargo lift car, two supporting covers are arranged outside the cargo lift car, and two springs are fixedly installed on the inner side walls of the two supporting covers. Two fixing grooves are formed in the inner side wall of the cargo lift car, and the inner side walls of the two fixing grooves are fixedly connected with buffering pads. According to the anti-collision device for the goods elevator, the buffering and blocking effects are achieved when the buffering plate and goods are thrown and collided, and the goods can be better borne by the goods elevator car.

The utility model discloses a wind power civil engineering embedded base, and belongs to the technical field of wind power civil engineering foundations. The wind power civil engineering embedded base comprises a base body, a supporting column and a drilling device, the supporting column and the drilling device are both installed on the base body, the drilling device comprises an inserting column, a threaded rod, a propelling device and two conical rods, the base body is provided with a positioning hole used for allowing the inserting column to pass through, and the two conical rods are transversely and symmetrically arranged; the side face of the inserting column is provided with an in-out hole for the conical rod to pass through, and the propelling device is used for converting the longitudinal screwing-in action of the threaded rod into the transverse screwing-in action of the conical rod. The pre-embedded base is used for wind power civil engineering foundation installation and use.

The invention relates to an anti-collision intelligent new energy automobile outdoor charging pile and method. The anti-collision intelligent new energy automobile outdoor charging pile specifically comprises a charging pile distribution box, and the charging pile distribution box comprises an electric box welding frame, a front protection door, a rear protection door, a side protection door, a top cover plate, a distribution board, a tempered display screen, a heat dissipation window and a bottom plate; the front protective door and the rear protective door are oppositely and fixedly arranged on the two sides of the electric box welding frame, the two sets of side protective doors are oppositely and fixedly arranged on the two sides of the electric box welding frame and are perpendicular to the front protective door, and the top cover plate is fixedly arranged at the top end of the electric box welding frame. The bottom plate is fixedly arranged at the bottom end of the electric box welding frame and is arranged opposite to the top cover plate; hard contact generated by collision of the charging pile can be effectively reduced, deformation and damage of the charging pile caused by collision and irreversible damage of components in the power distribution cabinet due to hard contact collision are reduced, and the damage degree of the components in the collision process is reduced.

The utility model belongs to the technical field of anti-collision of material carriers, and particularly relates to an anti-collision device for a material carrier. Comprising two mounting plates which are distributed left and right, the outer sides of the mounting plates are provided with anti-collision bars which are independent of the mounting plates, the outer side walls of the mounting plates are provided with movable plates, buffer assemblies are arranged between the movable plates and the anti-collision bars, and at least two sets of folding plates are arranged between the movable plates and the anti-collision bars; a reset assembly is arranged between the movable plate and the mounting plate; and two baffle plates which are distributed front and back are arranged between the two anti-collision bars. According to the anti-collision device, the material carrying vehicle is surrounded in the middle through the two anti-collision bars and the two baffles, so that the purpose that the two anti-collision bars jointly resist external collision force is achieved, the anti-collision device has the better force unloading effect and the multi-directional anti-collision capacity, and the anti-collision capacity is improved to a certain degree.

The utility model relates to the technical field of die-casting forming dies, and discloses a die-casting forming die which comprises a die body and a protection device. By arranging the die, the upper shell, the lower shell, the hydraulic telescopic rod, the dead head, the protection device, the bottom plate and other structural components, an automobile part can be formed through die-casting through the die, the die can be protected through the protection device, impact on the mounting block and the movable plate can be buffered through the two buffering assemblies, and therefore the die is protected, and the service life of the die is prolonged. And through four damping structures, shock absorption can be conducted on collision borne by an anti-collision plate and a movable plate, the anti-collision effect on the mold is further improved, the mold can have the anti-collision effect, the effect that normal use of the mold is affected by collision is achieved, and the problem that although an aluminum block can be melted and recycled, the mold cannot be used normally is solved. However, the mold cannot have an anti-collision function, and normal use of the mold is easily affected when the mold is collided.

The invention discloses a reverse-gas spiral powder feeding device and a double-circulation collision system and method based on the reverse-gas spiral powder feeding device, and belongs to the field of material preparation. The reverse-gas spiral powder feeding device at least comprises but not limited to a particle separation device, a secondary circulation pipe and a spiral powder feeding mechanism; the particle separation device is provided with a plurality of outlets according to different particle sizes, and at least comprises a fine particle outlet, a coarse particle outlet and a product particle outlet; the coarse particle outlet is connected with the feeding end of the spiral powder feeding mechanism; the fine particle outlet is connected with an existing particle collision circulating pipeline; the discharging end of the spiral powder feeding mechanism extends into an existing particle collision circulating pipeline. The collision speed of the mixed target collision powder is increased, the collision energy is improved, and the problems that the speed difference of the mixed target collision powder is low, and the collision effect is poor are solved.

The utility model provides an LED packaging structure. The LED packaging structure comprises a support, the support comprises a connecting part and at least two bowl cups, at least one LED chip is installed in each bowl cup, the at least two bowl cups are connected through the connecting part, a plurality of pins are arranged below each bowl cup, and the pins are connected with the connecting part. Therefore, equivalently, at least two single-lamp LED packaging structures are connected together through the bracket to form a multi-lamp LED packaging structure, and the pins for fixing the LED packaging structure are multiplied, so that the welding force of the single LED packaging structure is favorably improved, and the anti-collision capability of the LED packaging structure after welding is improved. The utility model further provides an LED display module comprising the LED packaging structure and an LED display screen comprising the LED display module.

The invention relates to the field of road traffic informatization, in particular to a road traffic informatization anti-collision guardrail which comprises a supporting base, and locking ground feet are fixedly connected to the outer side of the bottom end of the supporting base; a connecting seat; the movable force unloading unit is arranged between the connecting seat and the supporting base, is positioned on the inner side of the supporting base and is connected with the connecting seat; the anti-collision protection unit is connected with the connecting seat; the plug-in type connecting units are arranged on the two sides of the connecting base and fixedly connected with the connecting base. Wherein the anti-collision protection unit comprises an energy absorption protection assembly, a buffering assembly, a self-adaptive energy supply assembly and an induction type guardrail assembly, through the arrangement of the anti-collision protection unit, impact force generated when a vehicle head or a vehicle body collides can be subjected to multiple buffering, and the vehicle can be prevented from rolling over after collision; and the connecting seat can move and turn over after collision, secondary buffering is achieved, and the situation that a large number of guardrail plates are broken due to collision is avoided.

The utility model discloses a rear wall structure and a vehicle, the rear wall structure comprises a rear wall inner plate, a rear wall outer plate and a rear wall reinforcing beam, the rear wall outer plate and the rear wall reinforcing beam are respectively arranged at the longitudinal outer side of the rear wall inner plate, the upper part of the rear wall inner plate is connected with the rear wall outer plate to form a first cavity, and the rear wall outer plate is arranged in the first cavity. The lower portion of the rear wall inner plate and the rear wall reinforcing beam are connected and define a second cavity, and the longitudinal outer side of the rear wall inner plate is connected with an anti-collision beam. According to the utility model, the upper part of the rear wall inner plate and the rear wall outer plate are connected and encircled to form the first cavity, and the lower part of the rear wall inner plate and the rear wall reinforcing beam are connected and encircled to form the second cavity, so that a plurality of crumple energy absorption cavities are formed at the tail part of the vehicle, and the collision energy absorption of the tail part of the vehicle is strengthened; the first cavity strengthens the collision performance effect of the upper area of the tail of the vehicle, and the second cavity and the anti-collision beam act together to strengthen the collision energy absorption effect of the lower area of the tail of the vehicle.

The utility model relates to the field of road traffic, in particular to a road traffic safety protection device which comprises a supporting column. The supporting seat is fixedly mounted at the lower end of the strut and used for supporting the protective device; the light emitting strip is arranged above the supporting column and used for improving the visual field of a driver. According to the road traffic safety protection device, through the arrangement of the connecting frame, the telescopic rod, the buffer spring, the air bag and the buffer plate, when a vehicle collides with the buffer plate in the running process, buffer supporting is conducted through the buffer plate preferentially, and when the buffer plate is extruded by impact force, the buffer plate is not prone to falling off. A plurality of telescopic rods and buffer springs on the rear portion are used for buffering impact force, so that the impact force generated by vehicle collision is absorbed, the buffering effect is further improved through extrusion between an air bag and a buffer plate, in this way, through the multi-layer buffering arrangement, the impact force generated by vehicle collision is absorbed, and the protection capacity of the device is improved; and meanwhile, the damage to a driver and passengers in the vehicle is also reduced.

The utility model relates to the technical field of charging piles, and discloses an outdoor charging pile which comprises a foundation, the top of the foundation is fixedly provided with a charging pile body, the charging pile body comprises an anti-collision buffering mechanism, a wire harness winding mechanism and an inner shell, and the anti-collision buffering mechanism comprises an outer shell, an impact rod, a buffering frame and an impact clamping bolt. The wire harness winding mechanism comprises a motor, a rotating shaft, a driving gear, a driven gear, a winding wheel, a rotating rod, a sliding rod, a guide plate, a traction rod and a fixing frame, and a reciprocating groove is formed in the outer surface of the rotating rod. The driven gear drives a rotating rod to rotate, the rotating rod drives a traction rod to move through a reciprocating groove, the traction rod drives a guide plate to move, a rotating shaft drives a winding wheel to rotate, and the winding wheel can drive a charging wire to be wound or unwound.

The utility model belongs to the technical field of triangular gates, and discloses a triangular gate anti-collision plate which comprises a fixed plate body and a movable plate body which are arranged in parallel, elastic buffer rods which are evenly distributed are connected between the fixed plate body and the movable plate body, and a buffer strip is arranged at the position, close to the edge, of one side, close to the movable plate body, of the fixed plate body. Buffering assemblies arranged at equal intervals are arranged on the side, away from the fixed plate body, of the movable plate body, when a ship collides with the movable plate body, the movable plate body can move for buffering, impact force is buffered through elastic buffering rods, the elastic buffering rods can protect buffering springs, and the buffering effect is improved. The buffer springs are prevented from being corroded to affect the service life, when non-front-face collision occurs, the rotating cylinders can rotate to release force, buffering is conducted through deformation of the rotating cylinders and the fixing blocks, meanwhile, the movable plate body displaces, buffering is conducted through the elastic buffer rods, and the anti-collision effect can be greatly improved.

The utility model discloses an anti-collision wooden packaging box which comprises a wooden packaging box body, an anti-collision mechanism capable of being detached is arranged outside the wooden packaging box body, the anti-collision mechanism comprises an anti-collision assembly used for protecting the outside of the wooden packaging box body, the anti-collision assembly can be folded, and the anti-collision assembly is arranged on the outer side of the wooden packaging box body. The anti-collision assembly is composed of a front main anti-collision plate, a rear main anti-collision plate, a left side anti-collision plate and a right side anti-collision plate. The locking assembly is used for locking the positions of the main anti-collision plate and the side anti-collision plates; the inner side of the main anti-collision plate and the inner side of the side anti-collision plate are each provided with four sets of connecting assemblies. According to the anti-collision wooden packaging box, when the wooden packaging box has the anti-collision function, the anti-collision assembly is installed outside the box body through the connecting assembly, operation is convenient and fast, after the wooden packaging box is used, the anti-collision assembly can be detached, folded and taken back for next use, and the use cost of the device is reduced.

The present invention discloses a large vehicle anti-collision device, which relates to the field of vehicle protection, including an anti-collision seat, a buffer box and an anti-collision frame; the buffer box includes an anti-collision plate, a bearing tube and a sliding plate; a partition is provided in the middle of the bearing tube, the right side of the partition is connected to the sliding plate, the upper side of the partition is a cavity, and the lower side of the partition is a water cavity; a water pipe is fixed on the sliding plate; a plurality of positioning grooves are provided on the anti-collision seat, and a positioning rod is fixed horizontally in the positioning groove; an anti-collision strip is provided on the left side of the positioning rod; a limiting ring is provided in the middle of the outer peripheral side of the bearing tube, and a plurality of first springs are provided on the right end face of the limiting ring; a telescopic mechanism is provided on the right end face of the bearing tube. The anti-collision performance of the device is improved by providing the anti-collision seat, the buffer box and the anti-collision frame; the energy generated by the collision can be absorbed by providing the water cavity, the water pipe and the positioning rod; the first spring and the telescopic mechanism are used to buffer the impact force on the anti-collision seat and the buffer box, and the limiting ring is used to limit the buffer box when it is reset after the collision.

The utility model discloses a display module edge shading assembly capable of preventing light leakage, and particularly relates to the technical field of display module edge shading, the display module edge shading assembly comprises a supporting frame arranged on a shell, a display module and a backlight module are arranged in the middle of the supporting frame, and a supporting table is fixedly connected to the middle of the supporting frame; a positioning groove is formed in the outer surface of the bottom of the supporting frame. The packaging effect is improved through the shading glue, the light leakage prevention effect is achieved, meanwhile, the anti-collision effect of the periphery of the display module can be improved through the thickness of the shading glue, the protection effect is improved, the periphery of the display module is packaged through the second shading film, the situation that light leakage occurs on the periphery of the display module can be avoided, and the display effect is improved. Meanwhile, through cooperation of the shading glue, the shading top film and the shading bottom film, the strength and the thickness of wrapping the periphery of the display module are improved, and the situation that the shading effect is affected due to abrasion is avoided.

The invention provides a data memory for a vehicle-mounted device and the vehicle-mounted device. The data memory comprises a storage part, a shell and a cover body, wherein the storage part is used for storing driving data of the vehicle-mounted device, the shell is used for containing the storage part, the shell is provided with an opening, the cover body covers the opening in a sealing mode so as to limit the storage part from being separated from the shell, and the cover body is connected with the shell in a clamping mode; the technical problems that in the prior art, a shell used for containing a data storage device adopts a plug screw and a compression nut to be matched with a sealing gasket and a sealing ring to package an opening, and when the storage device needs to be overhauled, an operator needs to carry out complicated operation to disassemble and assemble the data storage device; therefore, the working efficiency of operators is influenced.

The application discloses a reaction kettle, which comprises a kettle body, a plurality of partitions are fixedly and assembledly connected in the kettle body, through the partitions, a kettle cavity in the kettle body forms a plurality of reaction cavities; the reaction kettle further comprises a layered stirring mechanism, the layered stirring mechanism comprises a stirring shaft, a pushing spiral plate assembly is fixedly and assembledly connected on the stirring shaft, the pushing spiral plate assembly comprises a plurality of lower pushing liquid spiral plates and upper pushing liquid spiral plates; the layered stirring mechanism further comprises stirring assemblies which are respectively located between the lower pushing liquid spiral plates and the upper pushing liquid spiral plates; in the stirring process, the lower pushing liquid spiral plates push reaction materials upwards, the upper pushing liquid spiral plates push reaction materials upwards, the pushing mode of the reaction materials by the lower pushing liquid spiral plates and the upper pushing liquid spiral plates increases the dissolving, crushing and mixing effects of the stirring assemblies on the materials, and the material reaction process is effectively and greatly increased.

The utility model discloses an automobile front longitudinal beam inner plate which comprises an inner plate front section and an inner plate rear section, the inner plate front section is provided with a first crumple rib which is vertically or approximately vertically arranged and used for guiding the front longitudinal beam inner plate to crumple longitudinally, and the tail end of the lower portion of the first crumple rib is provided with a concave portion used for inducing the front longitudinal beam inner plate to bend and deform. In the structure of the front longitudinal beam inner plate, the concave part is additionally arranged at the tail end of the lower part of the first collapse rib, so that the front longitudinal beam inner plate can be induced to generate larger bending deformation at the concave part when the front longitudinal beam inner plate collapses longitudinally, the collision collapse energy absorption effect of the front longitudinal beam inner plate is effectively improved, and the collision performance of the whole vehicle is further improved.

The utility model relates to the field of early warning device, solve the problem that the existing anti -collision early warning device is easy to fall off when the collision of offshore facilities, provide a kind of anti -collision early warning device, including installation part and damping mechanism, installation part is used to carry detection device, and installation part is the box body of one end opening, damping mechanism includes: protective plate, groove, guide rod, guide block, elastic part and rotating rod, protective plate and the open end of installation part are slidably connected, and sliding direction is along the depth direction of installation part;Groove is connected with the side close to installation part of protective plate;Guide rod is connected with the inner wall of groove;Guide block is sleeved in guide rod, and is slidably connected with guide rod;Elastic part is arranged between guide block and the end wall of groove;One end of rotating rod is rotatably connected with slider. The utility model increases the anti -collision structure distinguishing from air cushion on the protective plate, so that protective plate not only has certain activity, but also can increase the anti -collision performance of early warning device.