7331 results about "Handrail" patented technology

The invention discloses a light partition board transportation and installation device and method.The device comprises a transportation control mechanism, an overturning and lifting mechanism, a horizontal adjusting mechanism, an angle adjusting mechanism and a clamping and fixing mechanism, the transportation control mechanism comprises a transportation and installation vehicle body, and a handrail is fixedly installed at one end of the top of the transportation and installation vehicle body; a supporting shaft plate is fixedly installed at the top of the other end of the base, a turnover lifting mechanism is hinged to the supporting shaft plate and comprises a turnover plate and a lifting assembly, the lifting assembly is arranged in the turnover plate, a horizontal adjusting mechanism is arranged at the top of the lifting assembly, and an angle adjusting mechanism is arranged at the top of the horizontal adjusting mechanism. A clamping and fixing mechanism is arranged at the top of the angle adjusting mechanism; the functions of transportation, positioning, clamping, calibration and the like are integrated, a complete system is formed, equipment connection links are reduced, the construction efficiency is improved, and time waste, operation error risks and potential safety hazards caused by equipment switching are reduced.

A prefabricated modular stairwell and elevator shaft system is described. The system can include an end panel, a first side panel, a second elevator shaft panel, a second side panel, and a first elevator shaft panel. The prefabricated modular stairwell and elevator shaft system can also include stairwell components (including one or more treads, one or more landings, and one or more handrails), one or more counterweight rails, one or more counterweight brackets, a stairwell door, and a stairwell door frame.

A handrail folding structure for treadmill includes a pillar, a handrail, and a hinge assembly. The hinge assembly includes a first shaft, a second shaft, and a pin. The first shaft is fixed on the pillar, the second shaft is fixed on the handrail, and the second shaft is rotatably connected to the first shaft through the pin. The second shaft can rotate relative to the first shaft. The first shaft is provided with a first limiting portion, and the second shaft is provided with a second limiting portion for abutting against and cooperating with the first limiting portion. The first limiting portion is located on the rotation path of the second limiting portion. When the handrail is in an unfolded or folded state, the first limiting portion abuts against the second limiting portion.

The invention discloses a concrete vibrating system for construction of a large cantilever bent cap, and relates to the technical field of vibrating rods, the concrete vibrating system comprises a vibrating rod and a motor, one end of the motor is fixedly provided with a connecting pipe, the connecting pipe is fixedly connected with the vibrating rod, the concrete vibrating system further comprises a fixing ring fixedly installed on the upper portion of the outer portion of the vibrating rod, and a positioning assembly arranged on the upper portion of the fixing ring and used for positioning the vibrating rod. The positioning assembly comprises a base and a handrail assembly, the handrail assembly is arranged on one side of the outer portion of the connecting pipe, the base is arranged above the fixing ring, a through groove is formed in the top of the base in a penetrating mode, movable grooves are symmetrically formed in the two sides of the top of the base in a penetrating mode, and sliding rods are slidably connected into the two movable grooves. V-shaped frames are fixedly mounted at the bottom ends of the two sliding rods; and when the vibrating rod is pulled back and forth, the vibrating rod can be prevented from being in contact with the reinforcing steel bar, the surface damage of the reinforcing steel bar is avoided, a worker can conveniently vibrate concrete, and the convenience and practicability are improved.

The invention discloses a stable clamp for handrail welding machining, and relates to the field of handrail welding machining. An auxiliary positioning rubber part is mounted at the upper end of a reserved base, and a handrail workpiece to be machined is placed on the inner side of the auxiliary positioning rubber part; the inner side of the reserved base is rotationally connected with a movable butt joint piece, and the surface of the reserved base is fixedly connected with a fixed supporting plate. According to the stable clamp for handrail welding machining, in the welding work process, after a workpiece needing to be machined is placed between the auxiliary positioning rubber parts, the movable butt joint parts can be rotated by 90 degrees, so that the auxiliary positioning suction cup assemblies on the outer sides of the movable butt joint parts make contact with the outer side of the workpiece, and self-adaptive positioning treatment is conducted; a traditional bolt type mounting and positioning mechanism is not needed, the positioning stability is high, stable self-adaptive locking treatment is effectively carried out on a contacted workpiece, the dismounting link after positioning is more convenient, and the welding precision is effectively guaranteed in the follow-up welding work process.

A fall risk mitigation system includes a sensor gathering data associated with a person's bodily movements, and a control system that processes the sensor data and assesses the person's fall risk. The sensor may be integrated into a wearable device, or may be integrated into the person's environment as a camera / imaging device, a sensor in a floor tile or mat, etc., to gather movement data passively. If a heightened fall risk state is found, the control system may initiate a fall-mitigating intervention by transmitting a control signal to another device. The control signal may notify a caregiver, to prompt the caregiver to provide the intervention. Alternatively, the control signal may cause another device to notify the person, or cause a mechanism in the person's environment to automatedly deploy an assistive device to aid in preventing a fall, such as a bed guardrail, a handrail or grab bar.

The present invention relates to the technical field of livestock manure cleaning equipment, and specifically discloses a manure cleaning device for farm management, including a cleaning frame, a collecting frame is fixedly provided on the top of the cleaning frame, and a movable cover is flipped on the top of the collecting frame, and also includes: a conveying unit, a cleaning unit and a post-processing unit, and the conveying unit includes a conveying bin, and the conveying bin is fixedly provided on one side of the cleaning frame. The cleaning frame is designed with a structural combination of a driving motor, a driving wheel, a moving wheel and a hand frame, which reduces labor intensity and facilitates flexible mobile cleaning; the structural combination design of the movable cover of the collecting frame, the flushing ring pipe, the water storage tank and the water pump ensures internal cleaning and manure delivery efficiency, and the solid-liquid separation frame and the discharge port control component facilitate manure classification and processing and precise discharge, reduce labor intensity and pollution risks, and ensure farm hygiene and manure resource utilization.

The utility model discloses a three-folding type baby carriage frame which comprises a front foot carriage frame and a rear foot carriage frame, and the upper end of the rear foot carriage frame is hinged to the upper end of the front foot carriage frame. The front part of the seat frame is hinged with the front foot frame; the lower end of the handle assembly is hinged to the upper end of the rear foot frame; the control system enables the frame to be unlocked, folded or unfolded and locked, and comprises a locking assembly and an unlocking assembly arranged on the handle assembly; the sliding block is arranged on the rear foot frame and can be locked and fixed or unlocked to slide; the linkage rod is hinged to the handle assembly and the sliding block, and the rear portion of the seat frame is hinged to the linkage rod; and after being unlocked, the sliding block can slide and drive the front foot frame, the seat frame and the handle assembly to be close to and folded towards the rear foot frame. Folding of the front foot stool, the rear foot stool, the seat frame, the handrails and the handlebar rod is achieved through a linkage system, and folding is convenient.

The utility model relates to the technical field of feeding machines, in particular to a ceramic raw material production feeding machine which can protect a feeding port of a material storage tank, reduce danger and reduce workload of workers, and comprises the material storage tank and a feeding pipe arranged at the bottom, the feeding pipe is communicated with the material storage tank, a driving shaft is installed in the feeding pipe, and the driving shaft is connected with the feeding pipe. A spiral feeding blade is fixedly arranged on the outer wall of the driving shaft, a driving motor used for driving the driving shaft to rotate is fixedly arranged on the feeding pipe, one end of the driving shaft is concentrically connected with the rotating end of the driving motor, and two opposite protection assemblies are arranged on the two sides of the top of the storage tank. Each protection assembly comprises a connecting shaft and a plurality of handrails fixedly arranged on the connecting shaft, the handrails on the two protection assemblies are distributed in a crossed mode, and the connecting shafts are rotationally connected with the storage tank. A limiting rod is arranged at the bottom of each protection assembly, a fixing block is fixedly arranged on each connecting shaft, and the fixing blocks are connected with the storage tank through torsion springs.

The invention relates to the technical field of computer display screen testing, and particularly discloses a computer display screen testing device and a testing method.The computer display screen testing device comprises a frame, a driving mechanism is fixedly installed on the outer side of the frame, and a testing mechanism has a comprehensive detection function and a convenient waste collecting mechanism; a first electric push rod is started, a transverse plate moves downwards, a stamping block acts on the display screen, a pressure sensor monitors pressure in real time, whether the display screen is qualified or not is judged according to a pressure threshold value and the state of the display screen, and if the display screen is damaged during detection, waste falls into a collecting frame through a guide hopper, and meanwhile, when the stamping block makes contact with the display screen, a telescopic spring makes a friction plate stably make contact with the top of the screen; after the detection is finished, the bridge type handrail is pulled, the collecting frame is easily disassembled through the guide rail sliding block, waste collection is facilitated, and it is guaranteed that the detection is efficiently and orderly carried out.

The utility model relates to a waterproof construction laitance removing device which comprises a device box body and a Z-shaped handrail connected with the device box body, a square tube seat and a vibration rod connected with the square tube seat are installed on the front portion of the device box body, a vibration shovel is installed at the lower end of the vibration rod, and the vibration rod is connected with a vibration motor arranged in the device box body through the square tube seat. A slag suction box is arranged on the top face of the device box body, and a slag suction disc is arranged below the bottom face. According to the device, laitance slag blocks cleaned by the vibration shovel can be adsorbed and collected in a centralized mode through the slag suction box and the slag suction disc, meanwhile, dust generated during operation can be adsorbed, dust pollution is greatly reduced, the health of constructors is protected, the device can be flexibly used on a large waterproof operation face due to the fact that the device is provided with a power source, and potential safety hazards caused by long-distance external connection of cables are avoided.

An automatic transport device includes a first side and a second side opposite to each other, the first side includes a main drive device, a step drive wheel and a first handrail drive wheel in transmission connection with the main drive device, and the second side is provided with: a step driven wheel; a second handrail drive wheel, the handrail of the automatic transport device wraps around the first handrail drive wheel and the second handrail drive wheel; a first tensioning device and a first transmission member, the first tensioning device is capable of adjusting the movement of the step driven wheel relative to the step drive wheel, thereby maintaining the first transmission member between the step drive wheel and the step driven wheel in tension; and a second tensioning device and a second transmission member, the second handrail drive wheel is in transmission connection with the step driven wheel.

A deck chair with a seat has two opposite sides and two handrails, each handrail being arranged on one of the two opposite sides of the seat; a back arranged behind the seat and located between the two handrails; a footrest arranged in front of the seat and lower than a height of the seat; wherein, the back is rotatable relative to the seat, and the footrest is movable and is capable of extending back and forth relative to the seat. Various sitting postures and lying postures can be realized by adjusting the footrest and the back, thereby satisfying various needs and greatly expanding applicability.

The invention provides a transporting device for a plastic fishing raft and an operation method of the transporting device. The transporting device comprises a plastic fishing raft body. The rail assembly is fixedly installed on a walkway plate of the plastic fishing raft body through a rail fixing frame, the rail assembly comprises a cross rail and a linear rail which are installed in a crossed mode, and a positioning groove and a climbing block are arranged at the crossed position; the cargo carrying assembly comprises a conveying frame, a handrail and a cargo body, the cargo carrying assembly is movably installed on the rail assembly through a power assembly, the power assembly comprises driving motors symmetrically arranged at the front end and the rear end of the bottom of the conveying frame, and each driving motor drives wheels on a wheel shaft to rotate through a driving gear; the treads of the wheels are matched with the track contact surfaces, and the rims of the wheels are matched with the side edges of the track assembly. The mechanical level of mariculture operation is remarkably improved, and the problems that traditional manual carrying is low in efficiency and poor in safety are solved.

The utility model discloses a flatcar station adjusting auxiliary device, which belongs to the technical field of station auxiliary devices and comprises a pedal plate detachably mounted on a flatcar vehicle-mounted fixed pedal plate and an extending handrail detachably mounted on a flatcar handrail frame. A concave clamping groove used for clamping a horizontal steel plate on the outermost side of a flatcar vehicle-mounted fixed pedal is formed in the bottom face of the pedal, and an L-shaped clamping groove used for clamping a horizontal steel plate on the secondary outer side of the flatcar vehicle-mounted fixed pedal is formed in the front end of the pedal. The extending handrail comprises a supporting rod, a handrail ring arranged on the top of the supporting rod and a connecting assembly which is connected with the supporting rod and used for being detachably connected with the flat car handrail frame. The utility model can effectively solve the problem of potential safety hazard caused by poor standing position of railway shunting personnel at the box step at the front end of the flatcar.

Provided are a stroller frame and a stroller. A first rotating shaft and a second rotating shaft are provided at intervals on a stroller folding mechanism of the stroller frame, which is hinged to a handle assembly through the first rotating shaft, and is hinged to one end of a handrail assembly through the second rotating shaft; the handle assembly is hinged to a rear foot assembly through a third rotating shaft, the rear foot assembly is provided with a fourth rotating shaft, and one end of the handrail assembly and one end of a front foot assembly are both hinged to the rear foot assembly through the fourth rotating shaft; and the seat assembly has one side hinged to the handle assembly through a fifth rotating shaft and the other side hinged to the front foot assembly through a sixth rotating shaft.

A rapid deployment and reuseable, multi-level structural system called Metrideck that uses traditional types of walls structures and handrail. Metrideck system includes (a) a set of vertical columns each with a set of attachment features; (b) a set of pre-manufactured beams each said beam with a set of attachment features; (c) a Quicset® for connecting beam and columns; (d) a deck panel with hardware to attach it to the beams and with slots to attach a hanger bracket to connect to the wall structure; (e) a series of curbing that encircles the deck panel perimeter with a set of attachment features; (f) a stair system; and (g) a set of handrail / guardrails wherein the decking system maintains a modular relationship to the mating wall structures, provides multiple platform configurations, uses fewer components, and provides a higher strength to weight ratio compared to other rapid deployment structural systems.

The invention relates to the technical field of green plant pruning, in particular to a green plant pruning machine which comprises an intelligent trolley and a pruning knife and further comprises a lifting table, a swing arm, a pruning knife arm and an auxiliary pruning knife, the tail end of the swing arm is pivoted to the lifting table, and a limiting device for limiting 90-degree and 180-degree positions is arranged between the swing arm and the lifting table; the swing arm is vertically connected with the trimming cutter arm, and the trimming cutter is movably arranged on the trimming cutter arm; a base is arranged at the bottom of the pruning knife, an auxiliary pruning knife is arranged on the outer side face of the base, and orthographic projections of the upper end of the auxiliary pruning knife and the lower end of the pruning knife on the side face are overlapped. The two sides of the intelligent trolley are each provided with a distance measuring device used for sensing road edge stones. An obstacle detection device is arranged at the front end of the intelligent trolley; a handrail is movably connected to the rear portion of the intelligent trolley. The green plant strip trimming device can realize trimming based on road edge stones, trimming is thorough, and trimming conversion between the top and the side vertical face of a green plant strip is realized.

The utility model belongs to the technical field of garbage treatment, and particularly relates to a garbage leachate filtering device which comprises a base, a collecting assembly is arranged on the inner side of the base, supporting legs are fixedly installed at the four corners of the top of the base, and a filtering box is fixedly installed at the tops of the supporting legs. Inner sliding rails are fixedly connected to the interior of the filtering box at equal intervals, and filtering assemblies are slidably connected to the inner sides of the inner sliding rails. By the adoption of the structure, efficient filtering of percolate and convenient and fast collection of impurities are achieved through the optimized design of the filtering assembly and the collecting assembly, the obliquely-arranged filtering net is beneficial to filtering of the impurities and automatic discharging of the impurities into the collecting frame, frequent dismounting and mounting of the filtering net are reduced, the filtering efficiency is improved, and the filtering cost is reduced. And the collecting frame can be rapidly replaced through the design of a sliding groove and a sliding plate, impurities are convenient to clean, when maintenance is needed, the filter screen can be rapidly replaced only by loosening a bolt and pulling a handrail, and the use convenience and efficiency of the equipment are greatly improved.

The utility model relates to the technical field of workover rigs, in particular to an electrically-driven automatic workover rig which comprises a workover rig body, a lifting assembly is installed on one side of the workover rig body, and handrails are arranged on the two sides of the lifting assembly. The lifting assembly comprises a fixing plate, a lead screw penetrates through the interior of the fixing plate, a servo motor is installed above the lead screw, the outer wall of the lead screw is connected with a nut pair, a guide block is fixedly installed on the outer wall of the nut pair, one end of the guide block is fixedly connected with a pedal, and the other end of the guide block is fixedly connected with a lifting assembly. A guide rod penetrates through the end, away from the fixing plate, of the pedal. According to the workover rig, due to the arrangement of the lifting assembly, a worker does not need to climb actively, the possibility that the worker slips down is reduced, due to the arrangement of the auxiliary assembly, the worker can step on the rotating plate to enter a driller control room, the rotating plate is attached to the vertical plate, the possibility that oil stains appear on the surface of the rotating plate is reduced, and the safety of structural use is improved.

The utility model provides a solar panel assembly and a handrail assembly. The solar panel assembly comprises a solar panel, the solar panel is provided with a plurality of connecting hole groups and a plurality of positioning holes, and the plurality of connecting hole groups are arranged at intervals along a first direction; each connecting hole group comprises a plurality of connecting holes, the plurality of connecting holes are arranged at intervals along a second direction, the second direction is different from the first direction, and at least one positioning hole is formed between any two adjacent connecting hole groups; each connecting structure is matched with one connecting hole group, each connecting structure comprises a pull rope, the pull rope sequentially penetrates through the connecting holes of the connecting hole group, the part, penetrating through the connecting holes, of the pull rope comprises a first tensioning section and a second tensioning section, the first tensioning section is located on the first side of the solar panel, and the second tensioning section is located on the second side of the solar panel. The second tensioning section is located on the second side of the solar panel, and the first side of the solar panel and the second side of the solar panel are oppositely arranged; and each hoisting piece is connected with one positioning hole, and each hoisting piece is provided with a hoisting hole.

The utility model provides a novel rail unloading operation vehicle. A novel rail unloading operation vehicle comprises a hook buffer device, a handrail, a bogie, a boarding ladder, a steel rail traction device, an electrical system, a braking system, a rail unloading device, a welding machine storage platform, a guiding device, a rail shifting device, a vehicle frame and a cab. According to the novel rail unloading operation vehicle, steel rails are deformed to one side from the middle of the vehicle within allowable stress through the vehicle, fall into the center of the rail or the side of the rail through the guide device or directly fall into the rail bearing groove, and are matched with a rail welding vehicle and a rail transporting vehicle to complete transportation, welding and unloading of the long steel rails; the steel rail can pass through the lower part of the cab, so that a transverse displacement space is vacated for rail unloading operation; alignment with a welding machine of a rail welding vehicle is facilitated, the rail unloading position is flexible, and possibility is provided for integrated construction of rail overhaul; the steel rail is moved to the multiple rail unloading positions from the horizontal center position through the guide device, the variable site construction environment can be used, and convenience is provided for follow-up construction.

The invention discloses a stair climbing robot and an operation and control method. The four or more mechanical legs are connected with the machine body, extend downwards and are used for standing or climbing stairs; the one or more manipulators extend out of the upper surface or the side surface or the front surface of the machine body and are used for grabbing handrails or handrails; the bearing mechanism is arranged on the machine body; the detection mechanism is arranged on the machine body or the mechanical legs or the manipulators; the computer control device and the man-machine interaction device are arranged in the system; the sensor and the storage battery are arranged in the system; the mechanical legs and the manipulator are driven and controlled by the computer control device, the machine body or the hip joint or the mechanical legs or the shoulder joint or the mechanical arm or a motor in the shell, a transmission mechanism and a sensor; the control system enables the step stepping action of the mechanical legs to be matched with the approaching or grasping or releasing action of the manipulator to the handrail or the handrail, so that the robot can safely and stably carry people to go up and down stairs.

According to the intelligent voice broadcast system and method for the elevator, elevator car environment data are collected in real time through a multi-source heterogeneous sensor set, and passenger density distribution and movement tracks are calculated through fusion of a millimeter wave radar and a 3D visual sensor; physiological features of a handrail contact area are detected through a biological impedance sensor so as to judge the health state of a passenger, and the current signal-to-noise ratio is dynamically calculated and the voice frequency band is optimized through an environment noise analysis module. Therefore, by constructing a technical system of'multi-modal perception-edge intelligent decision-cross-modal interaction 'and adopting innovative means such as millimeter-wave radar and biological impedance fusion sensing, deep reinforcement learning of a dynamic strategy and a phased array directional sound field, the problems of broadcast stiffness, poor scene adaptability and privacy potential safety hazards are solved. According to the system and method, accurate passenger feature recognition, dynamic voice content generation and multi-channel collaborative feedback are achieved through two-dimensional innovation, and the intelligent level and service efficiency of elevator voice interaction are improved.

The invention relates to the technical field of calcium carbonate production, and discloses a heavy calcium carbonate production sampling device which comprises a U-shaped base, a lifting supporting seat is fixedly connected to one side of the upper end face of the U-shaped base, four universal trundles are fixedly connected to the lower end face of the U-shaped base, and two pushing handrails are fixedly connected to the outer wall of one side of the lifting supporting seat. The sampling assembly can be aligned with a sampling point of a ton bag through the transverse moving assembly, a lifting lead screw is driven by a first motor to rotate, the lifting lead screw rotates to drive a lifting moving block to descend along a lifting moving groove, and descending of the lifting moving block drives the transverse moving assembly and the sampling assembly to descend. According to the ton bag sampling device, a sampling tool can go deep into a ton bag to a specified depth, and heavy calcium carbonate in the ton bag can be sampled at different depths through a spiral auger blade structure in the sampling assembly, so that the limitation problem that an existing sampling device can only sample the surface is solved.

The utility model is suitable for the technical field of staircase steel ladder platforms, and particularly relates to a building staircase steel ladder platform which comprises two vertically arranged lower platform stand columns and two vertically arranged upper platform stand columns, and one side of each lower platform stand column and one side of each upper platform stand column are jointly and detachably connected with a first inclined rod. The other side of the lower platform stand column and the other side of the upper platform stand column are jointly and detachably connected with a second inclined rod. According to the steel ladder platform, the lower platform stand columns, the upper platform stand columns, the first reinforcing assemblies, the stepping structures, the supporting stand columns, the platform rods, the second inclined rods, the stepping side beams, the protective rods and the grab rails are arranged, all the parts are fixed in a coaxial and detachable connecting mode, employees can go up and down a working face through the steel ladder platform, and the problem of edge hole protection is solved; and the steel ladder entry slip also serves as a staircase template and a steel bar construction operation platform, so that the applicability of the steel ladder entry slip is improved.

A storage and transportation apparatus is disclosed. The apparatus may include a base frame and a base plate attached to the base frame. The base plate may be attached to the base frame such that the base plate may be disposed parallel to a base frame plane. The apparatus may further include an inverted U-shaped handrail attached to the base plate. The handrail may include a handrail side portion and a handrail top portion. The apparatus may further include a support member attached to the base frame and the handrail top portion. The support member may be disposed at a predefined angle relative to the base frame plane. The apparatus may further include a deformable strap removably attached to the base frame and the handrail top portion. The apparatus may additionally include a J-bar that may be removably attached to the handrail side portion via a fastener.

The present invention discloses an electric folding wheelchair capable of ascending and descending steps. The wheelchair seat assembly is installed on the upper part of the wheelchair chassis assembly in a manner that the wheelchair seat lifting assembly can be lifted and lowered; the wheelchair wheel assembly and the wheelchair ascending and descending steps assembly are installed on the wheelchair chassis assembly; wherein the wheelchair seat assembly is composed of mutually connected foldable armrests, a foldable backrest and a wheelchair seat plate that can be translated; the wheelchair seat lifting assembly is a scissor-type mechanical structure, the upper end of the scissor-type mechanical structure matches the bottom of the wheelchair seat assembly, and the lower end of the scissor-type mechanical structure matches the wheelchair chassis assembly; the wheelchair wheel assembly is composed of a front wheel drive motor, a rear wheel drive motor and the front wheelchair wheel and the rear wheelchair wheel driven by the motor; the wheelchair ascending and descending steps assembly is composed of a front auxiliary wheel, a rear auxiliary wheel, a large motor and its power transmission mechanism. The present invention can be folded, saves space, and the seat can be freely translated and lifted, and has the function of ascending and descending steps, which is safe and reliable.

The invention discloses a tank container with linked crawling ladder handrails, and relates to the technical field of tank containers, the tank container with linked crawling ladder handrails comprises a container frame; the container frame comprises a side frame and an end frame, a ladder stand assembly is rotationally installed on the end frame, the lower end of the ladder stand assembly is connected through a connecting plate A and a connecting plate B, the ends, close to each other, of the connecting plate A and the connecting plate B are rotationally hinged, a transversely-arranged supporting plate is connected to the connecting plate A, and a linkage mechanism is connected to the transversely-arranged supporting plate. The support assembly comprises a fixing plate connected to the end frame, a supporting frame is fixedly connected to the fixing plate, the fixing plate is further connected with an air cylinder through a hinge seat, and the other end of the air cylinder is hinged to the transverse supporting plate. The handrail assembly is rotationally installed on the side frame and connected with the linkage mechanism, the linkage mechanism controls unfolding and closing of the handrail assembly by controlling the crawling ladder assembly, a handrail on the top can be automatically opened while the crawling ladder is opened, and a safer operation environment is formed.