33results about How to "Guaranteed crashworthiness" patented technology

A method for reducing the weight of saloon car bodies based on the response surface method includes: a, improving the structure of the spare parts to select the optimum structure, b, carrying out code transformation to the test design variables, c, arranging test points with the isometiric design method to determine a test plan, d, setting up a response surface model based on the test result, e, validating the effectiveness of the response surface model, f, optimizing the spare parts of the body taking the quality of the spare parts as the target function and the energy absorption parameter as the restriction condition.

The invention discloses a date-pit-type composite anti-collision system for a pier and a construction method for the date-pit-type composite anti-collision system for the pier. The composite anti-collision system comprises a prepressing-type anti-collision device which is arranged at the outer side of the pier, and a floating-type external retaining device which sleeves the outer side of the prepressing-type anti-collision device, wherein the floating-type external retaining device is in a date pit shape, and is formed by connecting a plurality of anti-collision boxes which float on the water surface; the prepressing-type anti-collision device comprises one or a plurality of date-pit-type anti-collision structures; each date-pit-type anti-collision structure comprises an external cofferdam, and an energy consumption layer which is arranged at the inner side of the external cofferdam and is composed of a plurality of energy consumption rings; each external cofferdam is in the date pit shape; each energy consumption ring comprises an elastic ring which is formed through prepressing, and an external protective sleeve which sleeves the outer side of the elastic ring. The construction method comprises the following steps of (1) building a horizontal construction platform; (2) conveying parts in place; (3) constructing fixing elements at the outer side of the pier; (4) constructing the prepressing-type anti-collision device; (5) constructing the floating-type external retaining device. The date-pit-type composite anti-collision system for the pier and the construction method for the date-pit-type composite anti-collision system for the pier have the advantages that the design is reasonable, the construction is simple and convenient, the use effect is good, and the pier can be effectively protected.

The invention discloses a cutting type railway vehicle energy absorption anticreeper. The cutting type railway vehicle energy absorption anticreeper comprises a piston rod, a cylinder body, an inner sleeve, a flange and a cooling pipe. The inner sleeve and the cylinder body are internally provided with cooling liquid. The inner sleeve and one end of the cylinder body are each connected with one side of the flange. The flange is provided with a guiding hole, wherein the piston rod is connected with the guiding hole in a sliding manner, and the guiding hole is aligned with the inner sleeve. A cutting tool is mounted at the other side of the flange and extends into a guiding groove in the piston rod. The cooling pipe unidirectionally extends to the mounting position of the cutting tool in a communicating manner from the interior of the cylinder body. The end, away from the flange, of the inner sleeve is provided with a damping hole, wherein the damping hole communicates with the cylinderbody. According to the cutting type railway vehicle energy absorption anticreeper, the mode that the tool is cooled through the cooling liquid is adopted; the probability that the tool is molten in the cutting process is lowered; reliability of the cutting tool is improved; meanwhile, after cutting, a cutting portion pushes a piston to extrude the cooling liquid in the cylinder body, and when vehicle collision occurs, part of kinetic energy can be converted into kinetic energy and pressure energy of the cooling liquid; and the breakage probability of the tool is lowered.

The invention discloses a pedestrian protection-based automobile energy absorption column A and an optimization method thereof. The automobile energy absorption column A comprises a left-side column A and a right-side column A, wherein the left-side column A and the right-side column A are symmetrically distributed on a vehicle center line, and respectively comprise an inner shell, an outer shell and an inner core; the inner shells, the outer shells and the inner cores of the left-side column A and the right-side column A are made of a carbon fiber material; and the inner cores are formed by three-dimensional indented hexagonal negative Poisson's ratio single-cell arrays. The invention furthermore discloses the optimization method of the automobile energy absorption column A; after optimization, two working conditions such as automobile-pedestrian collision and automobile front collision can be considered, so that the automobile crashworthiness and lightweight are ensured under the premise of reducing the pedestrian head injury.

The invention belongs to the technical field of automatic production, and particularly relates to a robot chassis. Anti-collision devices are symmetrically arranged on the two sides of the length direction of a bottom plate; the fixing plate of each anti-collision device is fixedly arranged in the middle of one side of the length direction of the bottom plate, elastic parts are retractable in the length direction of the bottom plate, telescopic parts are telescopic in the length direction of the bottom plate, one ends of the elastic parts are vertically connected to the middle parts of the fixing plates, the other ends of the elastic parts are vertically and fixedly connected with anti-collision beams, and the anti-collision beams are arranged in the width direction of the bottom plate; the elastic parts are arranged in the telescopic parts, one ends of inner sleeves of the telescopic parts are fixedly arranged on the fixing plates, baffles are arranged on the outer walls of the inner sleeves, one ends of outer sleeves are arranged on the other ends of the inner sleeves in a sliding and sleeving mode, and the other ends of the outer sleeves are vertically connected to the middle parts of the anti-collision beams; and travel induction switches are symmetrically arranged on the positions, at the two sides of the telescopic parts, of the bottom plate, and the travel induction switches are used for controlling the opening and closing of a driving motor according to the positions of the anti-collision beams. The robot chassis can adapt to complex situations and environments so as to guarantee the anti-collision effect of a robot.

The invention relates to the technical field of barricades, and discloses an anti-collision road barricade based on a non-Newtonian fluid. The anti-collision road barricade comprises a base; positionresetting mechanisms are arranged on four corners of the top of the base; a mounting plate is arranged at the tops of the four position resetting mechanisms; a bearing is inlaid in the middle of the mounting plate; a supporting column is fixedly mounted on the inner ring of the bearing; a protecting ring is fixedly mounted at the top of the supporting column; and a cavity inside the protecting ring is filled with the non-Newtonian fluid. According to the anti-collision road barricade, when the protecting ring is collided, the viscosity of the non-Newtonian fluid can be increased substantiallyat the moment of stress, the non-Newtonian fluid can be changed into a hard solid instantaneously, the anti-collision performance of the barricade is guaranteed, and damage caused by the collision force to the barricade is prevented; meanwhile, the barricade can be restored by the aid of the position resetting mechanisms after collision, so that inconvenience can be prevented from being brought tomaintenance persons, and dangers to vehicles can be reduced; and the non-Newtonian fluid has the advantages of convenience in use and low cost.

The invention relates to a modular energy dissipating device and an anti-collision pipeline of the modular energy dissipating device. The modular energy dissipating device comprises the anti-collision pipeline and a connection fixing base. The anti-collision pipeline comprises an outer pipe, a plurality of rubber rings and an inner pipe. The inner pipe, the rubber rings and the outer pipe are arranged coaxially. The outer surfaces of the rubber rings are matched with the inner walls of the outer pipe. After the anti-collision pipeline has a certain length, sealing cover boards are arranged at the two ends of the anti-collision pipeline. The anti-collision pipeline adopts the rubber rings as buffer units, the pipes are arranged inside and outside the rubber rings, structural design is delicate, and the manufacturing cost is reduced on the premise of guaranteeing the anti-collision capacity; besides, the anti-corrosion capacity is high, and good anti-corrosion performance is ensured. The width and height of an anti-corrosion facility can be increased after the anti-corrosion pipeline is fixed to the connection fixing base, and the requirement for anti-corrosion performance of bridges is met.

The invention discloses an energy storage control cabinet safety device, and particularly relates to the technical field of control cabinets, the energy storage control cabinet safety device comprises a cabinet, the lower surface of the cabinet is fixedly connected with the upper surface of a shell, a control mechanism and a dehumidification mechanism are arranged in the cabinet, the control mechanism is arranged in the shell, The left side face and the right side face of the machine cabinet are each fixedly connected with four first springs and four telescopic rods. According to the energy storage control cabinet safety device, air in the control mechanism is heated to expand, so that air can be compressed to ensure that water flow is smoothly discharged for fire extinguishing, the fire extinguishing mechanism can burst dry powder to achieve quick fire extinguishing under the condition that the fire behavior is large, fire spreading is avoided, and then the device can achieve automatic fire extinguishing; and the operation of double fire extinguishment can be realized, so that the first-time fire extinguishment treatment work is ensured, the fire extinguishment effect is more obvious, the fire loss can be reduced to the greatest extent, and better safety guarantee can be brought.

The invention relates to the technical field of mine protection bunkers, in particular to a movable and adjustable blasting bunker device. The movable and adjustable blasting bunker device comprises abunker body, the bottom of the bunker body is welded to a middle section top of a bearing guiding assembly, the bearing guiding assembly is used for movably discharging force after suffered from impact force, the bunker body is made of an alloy steel material and is an arc-shaped segment body curved surface with the forward-protruding middle, and a main gripping ring is welded to the middle innerwall of the arc-shaped segment body curved surface. Safety protection can be effectively conducted on current workers, the protection property is good, the movable and adjustable blasting bunker device can move to reduce the impact force of sandstone after impacted severely by the sandstone, the front end of a whole bunker adopts the design of an arc-shaped spherical metal structure, thus the intensity of protection from the sandstone can be effectively improved, the workers can effectively grip the bunker inside the bunker, and stability of the workers inside is improved.

The invention discloses a reducer with stable heat dissipation and anti-collision, which comprises a protective frame. There are three moving plates installed on the two mounting frames. A lifting seat is installed on the moving plate along the vertical direction. One side of the lifting seat is fixedly installed with a mounting sleeve. The bottom end of the mounting sleeve is telescopically connected with a longitudinal The bottom end of the vertical rod is fixedly installed with a pressure column, the bottom of the moving plate is fixedly installed with a connecting arm, and the bottom end of the connecting arm is fixedly installed with a buffer assembly; the present invention can maintain the speed reduction while ensuring the anti-collision performance of the reducer. The internal ventilation of the reducer is good, so as to ensure that the reducer can dissipate heat stably. It can be installed on the main body of the reducer with different sizes.

The invention discloses a speed reducer capable of stably dissipating heat and preventing collision. The speed reducer comprises a protective frame, wherein a speed reducer main body is installed at the bottom of the inner side of the protective frame, a lifting frame is movably installed at the inner side of the protective frame, two installation frames are movably installed at the inner side ofthe lifting frame, and three movable plates are installed on each installation frame. A lifting seat is movably mounted on each moving plate in the vertical direction, a mounting sleeve is fixedly mounted at one side of each lifting seat, a longitudinal rod is telescopically connected to the bottom end of each mounting sleeve, a pressing column is fixedly mounted at the bottom end of each longitudinal rod, a connecting arm is fixedly mounted at the bottom of each moving plate, and a buffer assembly is fixedly mounted at the bottom end of each connecting arm. According to the speed reducer, good ventilation inside the speed reducer can be kept while the anti-collision performance of the speed reducer is guaranteed, so that it is guaranteed that the speed reducer can dissipate heat stably, speed reducer bodies of different sizes can be installed, the applicability is high, the anti-collision performance of the speed reducer is excellent, and the service life of the speed reducer body isguaranteed.

The invention relates to a modular energy dissipating device and an anti-collision pipeline of the modular energy dissipating device. The modular energy dissipating device comprises the anti-collision pipeline and a connection fixing base. The anti-collision pipeline comprises an outer pipe, a plurality of rubber rings and an inner pipe. The inner pipe, the rubber rings and the outer pipe are arranged coaxially. The outer surfaces of the rubber rings are matched with the inner walls of the outer pipe. After the anti-collision pipeline has a certain length, sealing cover boards are arranged at the two ends of the anti-collision pipeline. The anti-collision pipeline adopts the rubber rings as buffer units, the pipes are arranged inside and outside the rubber rings, structural design is delicate, and the manufacturing cost is reduced on the premise of guaranteeing the anti-collision capacity; besides, the anti-corrosion capacity is high, and good anti-corrosion performance is ensured. The width and height of an anti-corrosion facility can be increased after the anti-corrosion pipeline is fixed to the connection fixing base, and the requirement for anti-corrosion performance of bridges is met.

The invention discloses a disengagement device. The device comprises a capsule body, a plurality of anti-collision rods are connected around the capsule body, a plurality of observation windows are formed in the side walls of the capsule body, openings are formed in the side walls of the capsule body on the upper and lower sides of the anti-collision rods, connecting rods are arranged in the openings, two ends of the connecting rods penetrate through the openings to reach the two sides of the openings, the middle of the connecting rods are rotatably connected with the side walls of the capsulebody, clamping blocks are connected with one ends of the connecting rods, clamping grooves are formed in the side walls of the anti-collision rods, first springs are connected with the other ends ofthe connecting rods, fixing blocks connected with the other ends of the first springs are arranged on the inner walls of the capsule body, first opening holes are formed in the middle of the fixing blocks, first pull ropes are arranged in the first opening holes in a penetration mode, one ends of the first pull ropes are connected with the connecting rods, and the other ends of the first pull ropes are connected with rotary rollers rotatably connected with the side walls of the capsule body. According to the disengagement device, not only is the anti-collision effect of a rescue elevation capsule guaranteed, but also the clamped anti-collision rod can be disengaged rapidly to further guarantee safety of trapped personnel.

The invention discloses a combined type railway vehicle energy absorption anticreeper. The combined type railway vehicle energy absorption anticreeper comprises a piston rod, a cylinder body, a flangeand a cooling pipe. The cylinder body is internally provided with cooling liquid. One end of the cylinder body is connected with one side of the flange. The flange is provided with a guiding hole, wherein the piston rod is connected with the guiding hole in a sliding manner. A piston is arranged at the tail end of the piston rod, wherein the piston is connected with the inner wall of the cylinderbody in a sliding manner. A cutting tool is mounted at the other side of the flange and extends into a guiding groove in the piston rod. The cooling pipe unidirectionally extends to the mounting position of the cutting tool in a communicating manner from the interior of the cylinder body. According to the combined type railway vehicle energy absorption anticreeper, the mode that the tool is cooled through the cooling liquid is adopted; the probability that the tool is molten in the cutting process is lowered; reliability of the cutting tool is improved; meanwhile, after cutting, a cutting portion pushes the piston to extrude the cooling liquid in the cylinder body, and when vehicle collision occurs, part of kinetic energy can be converted into kinetic energy and pressure energy of the cooling liquid; and the breakage probability of the tool is lowered.

The invention relates to the technical field of vehicle battery structures and discloses a novel electric road vehicle lead storage battery. The battery comprises a lead storage battery body, whereina battery cover is fixedly connected to the top of the lead storage battery body, and butt joint ends are fixedly connected to the left side and the right side of the top of the battery cover; a protection box is movably connected to the exterior of the lead storage battery body, a mounting plate is fixedly connected to the bottom of the protection box, four positioning holes are formed in the mounting plate, an adjusting table is fixedly connected to the inner bottom wall of the protection box, and two limiting rings are fixedly connected to the interior of the adjusting table. According to the novel lead storage battery for the electric road vehicle, the overall structure is simple, the lead storage battery can be conveniently subjected to multi-directional positioning, protection and shock absorption treatment, meanwhile, installation is very convenient, and wiring is safe; therefore, a problem that the lead storage battery on the electric road vehicle is damaged and further is damaged due to external shaking and the like is effectively solved.

The highway isolation pier device capable of moving rapidly comprises a pier body, an embedding groove is formed in the bottom of the pier body in the vertical direction, and a moving mechanism used for moving the pier body is arranged in the embedding groove; the middle of the pier body is in threaded connection with a connecting column in the vertical direction. The two ends of the connecting column penetrate through the top end and the bottom end of the pier body correspondingly. An equipment cavity is formed in the middle of the pier body and located over the caulking groove, a transmission assembly is installed in the equipment cavity, and the connecting column is in transmission fit with the moving mechanism through the transmission assembly. According to the road barrier device capable of rapidly moving, the moving mechanism is arranged at the bottom of the barrier body, the position of the moving mechanism in the caulking groove is controlled through the connecting column, the moving mechanism extends out of the caulking groove when the barrier needs to move, and the moving mechanism enters the caulking groove when the barrier needs to be fixed; while the road barrier is convenient to move, the anti-collision capability of the road barrier can be ensured, and the defects in the prior art are overcome.

The invention provides a bridge anti-collision system based on multiple protection devices. The bridge anti-collision system comprises a primary bridge body, fences, a secondary bridge body, bridge road-danger warning light devices, primary fixing plates, primary supporting rods, a wind indicator device, a secondary fixing plate, a secondary supporting rod, an inflatable air sac device, an adjustable maintaining plate device, an installing clamping plate device, a damping rebound pad device and an anti-collision rotating wheel device. According to the bridge anti-collision system based on the multiple protection devices, as a rubber wheel, a wheel shaft, a primary U-shaped protection frame and a secondary U-shaped protection frame are arranged, the protection effect can be achieved; meanwhile, when an automobile is crashed into a bridge, the automobile can be forced to be away from the bridge, and the once safety protection effect on the automobile and the bridge is achieved; as anti-playing clamping rings are arranged, it can be avoided that the rubber wheel is clamped, and the protection capacity is guaranteed; as a primary protection plate, buffer springs, a secondary protection plate and X-shaped frames are arranged, the multi-protection capacity can be improved, and the anti-collision effect of the bridge is guaranteed.

The anti-collision guardrail assembly structure based on the hot-rolled steel comprises a guardrail stand column, a plurality of butt joint pipes are fixedly connected to the middle of the guardrail stand column, and horizontal handrail assemblies are installed on the inner walls of the butt joint pipes; the horizontal handrail assembly comprises a blocking plate, a bearing plate is arranged on one side of the blocking plate, a cavity is formed in the middle of the blocking plate, and a reset push plate is slidably connected to the inner wall of the cavity. The butt joint pipes are arranged on the guardrail stand columns to install the horizontal guardrail assembly, the connecting stability of the assembling pipes and the butt joint pipes is improved through limiting butt joint of the limiting elastic pieces and the assembling grooves, meanwhile, the limiting elastic pieces are arranged in a bent mode, and therefore when the blocking plates are impacted by external force and move, the blocking plates can be prevented from being damaged through bending deformation of the limiting elastic pieces. And impact is buffered and absorbed, and the overall anti-collision capacity of the guardrail is effectively improved.

The invention relates to the field of differential pressure flowmeters, and discloses a differential pressure flowmeter in a waste water pipeline, which includes a pipe body, the outer surface of the upper end of the pipe body is provided with a pressure guiding tube, and the lower end of the pressure guiding tube Extending to the inner side of the pipe body, and the pressure guiding tube is fixedly connected with the tube body, the outer surface of the pressure guiding tube is provided with a buffer structure, the upper end of the pressure guiding tube is connected to the main body of the flowmeter, and the flowmeter The front end of the main body is movably equipped with a protective structure, the rear end of the flowmeter main body is provided with an anti-collision structure, and the outer surface of the upper end of the pipe body is provided with a dredging structure on the side close to the pressure guiding tube. The differential pressure flowmeter in the waste water pipeline has the advantages that the pressure guide tube is not easy to be damaged, the instrument panel is not easy to be scratched, plays a good protective role during the transportation process, and is easy to clean the dirt accumulated in the pipe body.

The invention discloses anti-collision fluorescent glass. The glass comprises a glass body, a sensor and a loudspeaker connected with the sensor are arranged on the glass body, and fluorescent layers are arranged around the glass body or at all the corners of the glass body. The anti-collision fluorescent glass is simple in structure, easy to manufacture and attractive because light can be emitted around the glass body to remind people of the glass, and has the advantages of being good in anti-collision effect, capable of dispelling mosquitoes, wide in application range and the like, and is worthy of popularization.

The invention relates to a mine truck cab. The cab comprises a front framework, a top plate, a buffering device, an upper protection device and a front protection device; the upper protection device is connected to the top plate; the front protection device is fixedly connected to the middle power portion of the front framework; the buffering device is connected to the front framework through a bolt; the upper protection device and the front protection device are mutually welded by a plurality of cross rods and vertical rods to be in net shapes; the front protection device is fixedly connected to the buffering device. The mine truck cab is simple in structure, firm in connection, wide in vision, high in protection intensity and safe and reliable, the anti-collision intensity of the cab is guaranteed due to the fact that the protection device is arranged on the middle lower portion of the front framework, and the vision of a driver is guaranteed.

The invention relates to the technical field of mine protection shelters, in particular to a mobile adjustable blasting shelter device, which includes a shelter main body, the bottom of the shelter main body is welded to the top of the middle section of a supporting guide assembly, and the supporting guide assembly is used for Realize moving and unloading force after being impacted. The main body of the bunker is made of alloy steel. There is a main grip ring welded on it. It can effectively provide safety protection for the current staff, and the protection is good. After being severely impacted by sand and gravel, the device can move to reduce the impact force of sand and gravel, and the front end of the bunker is designed with an arc-shaped spherical metal structure, which can Effectively improve the protection against sand and gravel, the staff can effectively grasp the bunker inside the bunker, and improve the stability of the staff inside.

The invention relates to the field of robot battery equipment, in particular to an intelligent value protection robot battery management system which is characterized in that one side of the outer wall of a battery main body is sleeved with a battery box, one side of the outer wall of the battery box is sleeved with an upper fixing frame, one side of the bottom end of the battery box is provided with a base, and one side of the outer end of the base is fixedly provided with a fixing seat; a heat dissipation fan is arranged on the side, close to the battery box, of the inner side of the fixing base, a mounting base is fixedly mounted on the side, corresponding to the heat dissipation fan, of the inner wall of the fixing base, the mounting base is arranged between the fixing base and the heat dissipation fan, and a temperature measuring mechanism is arranged on one side of the top end of the upper fixing frame; and two groups of connecting mechanisms are arranged between the upper fixing frame and the base at equal intervals. According to the intelligent value protection robot battery management system, the battery can be cooled more timely, the practicability of the whole device is effectively improved, and a better use prospect is brought.

The invention relates to the technical field of modified plastic processing, in particular to a plastic functional modified master batch and a preparation method thereof. The plastic functional modified master batch comprises the following components in parts by weight: 100-300 parts of polypropylene resin, 100-300 parts of polybutylene succinate, 30-50 parts of organic tin, 10-20 parts of compatilizer, 2-5 parts of plastic additive, 2-5 parts of antioxidant and 20-30 parts of pigment. After the plastic functional modified master batch is prepared from new components, the overall toughness, collision resistance and other properties of the plastic functional modified master batch can be effectively improved, and the master batch has favorable properties; according to the master batch, secondary mixing is adopted for pre-processing and mixing, so that sufficient mixing of materials before granulation can be guaranteed, and sufficient fusion of all components in the granulated master batch is guaranteed.

The invention discloses a date-pit-type composite anti-collision system for a pier and a construction method for the date-pit-type composite anti-collision system for the pier. The composite anti-collision system comprises a prepressing-type anti-collision device which is arranged at the outer side of the pier, and a floating-type external retaining device which sleeves the outer side of the prepressing-type anti-collision device, wherein the floating-type external retaining device is in a date pit shape, and is formed by connecting a plurality of anti-collision boxes which float on the water surface; the prepressing-type anti-collision device comprises one or a plurality of date-pit-type anti-collision structures; each date-pit-type anti-collision structure comprises an external cofferdam, and an energy consumption layer which is arranged at the inner side of the external cofferdam and is composed of a plurality of energy consumption rings; each external cofferdam is in the date pit shape; each energy consumption ring comprises an elastic ring which is formed through prepressing, and an external protective sleeve which sleeves the outer side of the elastic ring. The construction method comprises the following steps of (1) building a horizontal construction platform; (2) conveying parts in place; (3) constructing fixing elements at the outer side of the pier; (4) constructing the prepressing-type anti-collision device; (5) constructing the floating-type external retaining device. The date-pit-type composite anti-collision system for the pier and the construction method for the date-pit-type composite anti-collision system for the pier have the advantages that the design is reasonable, the construction is simple and convenient, the use effect is good, and the pier can be effectively protected.

The invention provides an eddy-current guardrail anti-collision device. The eddy-current guardrail anti-collision device comprises a fixed steel plate, outer barrels, rotating steel plates, racks, U-shaped springs, rubber warning posts, U-shaped spring connection holes A, fixing piles, rotating steel plate connection holes, gears, central rotating shafts, fixed magnets, middle barrels, moving magnets, damping fluid, rotating steel plate connectors, U-shaped spring connection holes B, rack connection parts, rubber plates and a graphene coating. The device is mounted on two sides of a road, andwhen a running vehicle deviates and bumps into a guardrail, the rotating steel plates rotate, the U-shaped springs generate force opposite to a collision direction by compression deformation to assistthe vehicle in driving direction correction; meanwhile, the rotating steel plates drive the middle barrels and the outer barrels to rotate in opposite directions through a transmission system, then conductors and permanent magnets have relative motion, energy dissipation is realized by eddy-current damping and viscous damping to reduce interaction force between the vehicle and the guardrail, andaccordingly safety of the vehicle and a driver can be guaranteed.

The invention relates to a novel side protective fence. The novel side protective fence comprises an upper protective beam, a lower protective beam and a plurality of connecting rods, wherein the upper protective beam is parallel to the lower protective beam, the upper end and the lower end of each connecting rod are fixed to the upper protective beam and the lower protective beam through rivets respectively in a hinged mode. When the upper end of a locking rod is fixed into a circular hole I, the upper protective beam and the lower protective beam are spread, a fixed side protective fence assembly can be formed, the collision preventing strength is guaranteed, and the side protection function is achieved. After the locking rod is dismounted from the circular hole I, the lower protective beam can be driven to swing through the connecting rods and finally swing to the position where the lower plane of the upper protective beam makes contact with the upper plane of the lower protective beam, the side protective fence is folded and stored, the locking rod is fixed to a circular hole II, and fixing is achieved. Due to the fact that the lower protective beam moves upwards, a worker can conveniently enter the part below a vehicle to maintain the vehicle. The novel side protective fence is easy and convenient to use.