53results about How to "With buffer protection" patented technology

The invention discloses an artificial-imitating dragon fruit picking device. The artificial-imitating dragon fruit picking device comprises a clamping mechanism, a sensing mechanism, a cutting mechanism and a controller, wherein the clamping mechanism comprises two clamping claws and a first drive device, touch sensors are arranged on concave arc clamping faces of the two clamping claws, end partsof the two clamping claws are rotationally arranged on the first drive device, and the first drive device is used for driving the two clamping claws to rotate oppositely or away from each other; thefirst drive device is vertically connected with a linear drive mechanism, a drive end of the linear drive mechanism is connected with the sensing mechanism, and the linear drive mechanism is used fordriving the sensing mechanism and the cutting mechanism to move away from the clamping mechanism. The artificial-imitating dragon fruit picking device can replace artificial work to pick the fruit with picking shears, picking is time-saving and labor-saving, and the automation level is high; dragon fruit blades can be found precisely and cut, and damage to the fruit in the picking process can be reduced; certain mesophyll can be cut according to picking requirements, and the dragon fruit is convenient to transport and store.

The invention discloses a corrugated paper corner armor used for a flat product, wherein the corrugated paper corner armor is arranged at each of four feet of the flat product, the corrugated paper corner armor consists of a corrugated paper base and a corrugated paper clamp seat, and the corrugated paper clamp seat is arranged on the corrugated paper base. The corrugated paper corner armor used for the flat product is convenient to prepare, avoids pollution, is easy to recover, is convenient to store and deliver, and is low in package cost.

The invention discloses a multifunctional packaging box and packaging method for non-substance cultural heritage Beijing Figurines. A box cover, a box body and a box bottom are involved, the box bodyis in a hexagonal prism shape, the box cover comprises a cover plate structure, the cover plate structure is arranged at the top of a body plate in the box body, and a second folding mark line is arranged between the cover plate structure and the body plate; the cover plate structure comprises a cover plate, and a plurality of edges of the cover plate are all connected with first front pieces; and third folding mark lines are arranged between the first front pieces and the cover plate, the cover plate structure and the body plate are folded through the second folding mark line, the first front pieces and the cover plate are folded through the third fold mark lines, and the top of the body plate is connected with the first front pieces in an inserted mode. According to the box and the method, the box bottom has a buffer protection performance; the box cover, the box body and the box bottom are all connected through the inserting connection mode, the use of a packing tape and an adhesive is reduced, so that green and environment-friendly effects are achieved, the production cost is reduced, and a plurality of times using of the packaging can be realized; and the invention further provides a display function, the subsequent functions of the packaging are increased, and the multifunctional utilization of the single packaging is realized.

The invention provides a turbulence generating device capable of adjusting the turbulence intensity. The device is applied to constant volume combustion bomb test equipment. The device is composed ofsingle-cylinder engines (1), flexible couplings (2), gas pipelines (3), flow distribution cavities (4), a constant volume combustion bomb (5), a double-output shaft motor (6) and a digital frequency modulator. The motor drives pistons of the single-cylinder engines to move in a reciprocating mode, and jet flow is generated through the gas pipelines to generate a collision in the center of the constant volume combustion bomb, so that an isotropic turbulence environment is formed in the center; and the rotating speed of the double-output shaft motor is controlled by adjusting the digital frequency modulator so as to control the turbulence intensity. Compared with a traditional turbulence generating device, the device can generate controllable and isotropic stable turbulence; the double-output shaft motor can enable the two single-cylinder engines to synchronously and stably move through the flexible couplings, so that the overall structure is compact; and the flow distribution cavities ensure that the speed and the flow are same when the gas flow in the reciprocating motion process of the pistons passes through connected gas holes of the constant volume combustion bomb, so that the accuracy of a simulation experiment is further improved.

A new energy automobile battery anti-collision detection device disclosed by the present invention comprises a detection outer frame, a first motor, a second motor and an adjusting rod, a hydraulic cylinder is installed at the top of the detection outer frame, the output end of the hydraulic cylinder penetrates to the inner side of the detection outer frame and is connected with a mounting plate, and a pressing block is attached to the inner side of the bottom of the mounting plate. A threaded cylinder penetrates through the inner wall of the mounting plate, the threaded cylinder is clamped with a clamping groove formed in the side wall of a pressing block through a clamping rod, the outer side of the mounting plate is clamped to the inner side of a lifting plate, and a fixing rod penetrates through the inner wall of the lifting plate; the first motor is installed in the middle of one side of the detection outer frame, and the output end of the first motor is connected with a bidirectional lead screw. According to the anti-collision detection device for the new energy automobile battery, through the arrangement of the first motor, the bidirectional screw rod, the limiting piece and the sliding rod, the two screw sleeves can be conveniently driven to slide oppositely, the positioning rod and the positioning plate on each screw sleeve move back and forth along with the screw sleeves, and automobile batteries of different sizes can be conveniently limited.

The invention discloses a transportation and storage device for functional foods. The transportation and storage device for the functional foods comprises a box body, elastic lugs, first grooves, drying agent boxes, vent holes and soft cushions. The front side and the rear side of the box body are symmetrically provided with rotating shafts. The elastic lugs are arranged on the left side and the right side of a fixing block. The four corners of the box body are provided with connecting columns. The first grooves are symmetrically formed in the left side of the box body. The drying agent boxesare symmetrically arranged on the left side and the right side of the bottom in the box body. The front side and the rear side in the box body are symmetrically provided with sliding wheels. A movablepanel is provided with an ice bag groove. The vent holes are symmetrically formed in the front surface of the box body. Damping springs are installed below a box cover. Round grooves are reserved inthe four corners of the bottom of the box body. According to the transportation and storage device for the functional foods, the left side and the right side of the box body are provided with the first grooves and connecting plates, a plurality of same devices can be conveniently connected and fixed together, and therefore a certain protection function for the functional foods in the box body canbe achieved.

The invention provides a plug-in vibrator for tunnel construction, which includes a handle, a fixed bushing, a locking bolt, a motor, a spring and a positioning shaft. A driving wire rope is arranged inside the driving hose, and the driving One end of the wire rope is rotatably connected to the central drive shaft of the vibrator, and the other end is rotatably connected to the motor shaft; the motor is screwed to the top of the fixed tray, and there are four symmetrical vertical supports around the motor. Positioning shaft; the top of the four positioning shafts is provided with a threaded fixing hole; the front, rear, left and right side walls of the fixed tray are welded and fixed with an arc-shaped baffle, and the four arc-shaped baffles The plates are welded together to form a peripherally enclosed mudguard. The setting of the protective cover of the present invention can prevent the concrete from being lifted up and spilled inside the ventilation slot on the surface of the motor during the operation, causing the motor to be polluted and dirty and causing inconvenience to its cleaning.

The invention relates to the technical field of monitoring equipment protection, in particular to high-stability environment protection monitoring equipment which comprises a mounting base, three display screens are uniformly distributed around a sliding cylinder, a first rotating block and a second rotating block are symmetrically and rotationally arranged on a mounting rod in a sleeving mode, and a rotation limiting assembly is arranged between the first rotating block and the mounting rod. A steering limiting assembly is arranged between the second rotating block and the mounting rod, the sliding cylinder is connected with the mounting rod through a vertical position control assembly, a shell is fixedly arranged on the lower end face of the mounting base, and an elastic supporting assembly for limiting and supporting the balancing weight is arranged in the shell. In heavy wind day, the wind acting on the display screens can drive the three display screens to rotate, a taper angle formed by the two display screens is windward, the windward area of the display screens is reduced, the stability is improved; meanwhile, the elastic supporting assembly is arranged at the bottom of thedevice, and the overall force bearing range is enlarged; moreover, the device is protected in a long-time heavy wind.

The invention relates to a composite type brick. The composite type brick comprises a brick body which comprises a base layer and an elastic layer connected with the base layer. According to the composite type brick, the strength of the brick body is ensured through the base layer, elasticity of the brick body is ensured through the elastic layer, the brick is not easy to fracture in the laying process, people can move comfortably on the brick, the good protecting effect can be achieved, and sports health is facilitated; weather-proof performance is better, abrasion resistance is higher, the service life is longer, the strength of a surface layer and the elasticity are adjustable, and personalized products can be provided according to different place demands; and the elastic layer has thesound absorption function, and a floor laid by using the brick has the good mute effect.

The invention discloses a percussion hammer for bone and joint inspection, which includes a hammer head, grooves are opened on both sides of the hammer head, and a first spring is fixedly connected to the inner wall of the groove, and the first spring is away from One end of the inner wall of the groove is fixedly connected with a strike block, and the end of the strike block away from the first spring extends to the outside of the groove, the bottom of the hammer is provided with a slot, and the inner cavity of the slot is provided with a threaded tube , the bottom of the threaded pipe extends to the outside of the slot, the inner cavity of the threaded pipe is threadedly connected with a threaded rod, and the bottom of the threaded rod extends to the outside of the threaded pipe. The invention facilitates the disassembly of the hammer head, and can replace different hammer heads according to the needs of users, which is convenient for users to use. If it is necessary to carry multiple percussion hammers, it only needs to carry different hammer heads and a handle. , to avoid the problem of multiple handles occupying space, which is convenient for users to carry.

The invention discloses a capacitor containing a heat conducting and insulating film. The capacitor comprises a conductive thin film and the heat conducting and insulating film. The conductive thin film comprises an insulating dielectric layer and conductive layers arranged on the two faces of the insulating dielectric layer, and a cylindrical thin film core is formed by stacking and winding the conductive thin film and the heat conducting and insulating film. According to the capacitor containing the heat conducting and insulating film, the conductive thin film can be processed through the two-layer metal film plating method, materials are saved, and processing is easy; due to the fact that the heat conducting and insulating film is arranged, on the one hand, the insulating purpose can be achieved, on the other hand, the heat dissipation performance of the thin film core can be improved, and therefore negative influences caused by the excessively-large axial length of a pie-shaped capacitor on the heat dissipation performance are overcome. Meanwhile, heat conducting silica gel is preferentially selected as the heat conducting and insulating film according to the cost and the heat conducting and insulating performance.

The invention relates to the technical field of medical treatment, in particular to a cardiopulmonary resuscitation instrument for the emergency department. The instrument comprises: a bed board, wherein two automatic folding supporting devices are arranged on one side of the bed board; a plurality of support frames which are fixed on the lower surface of the bed board; a control panel which is fixed on one side of the bed board; a protective cover which is fixed on one sides, close to the support frames, of the bed board; and a storage battery which is fixed to one side in the protective cover, wherein the control panel is electrically connected with the storage battery through a wire. By arranging the bed board, the support frames, connecting shafts, U-shaped seats, supporting legs, universal wheels, reinforcing rods, rotating plates, electric telescopic push rods B, Z-shaped lifting frames, distance sensors, threaded rods, stepping motors, guide cylinders, pressing plates, soft cushions and buffer springs, the cardiopulmonary resuscitation instrument has the functions of automatic folding, automatic stretching, quick use, automatic approaching, automatic repeated pressing, buffer protection and the like.

The invention discloses an extrusion device for sealing a packaging paper bag of a packaging machine. The device comprises a rack, a limiting mechanism, an extruding mechanism and a glue discharging mechanism, wherein a belt conveyor is installed on an upper portion of the rack, a support is fixedly connected with one side of an upper portion of the rack, an extrusion mechanism is fixedly installed on the support, a fixing column and a fixing frame are fixedly connected with the rack, and the limiting mechanism is fixedly installed on one side of the upper portion of the rack. The device is advantaged in that a double-faced adhesive tape is adhered to a sealing opening of a packaging paper bag through an adhesive discharging mechanism, an electric push rod of the extrusion mechanism drivesa pressing block to extrude the sealing opening of the packaging paper bag to which the double-faced adhesive tape is bonded so that the double-faced adhesive tape obtains the better bonding effect,under the cooperation of a semi-automatic conveying belt and the electric push rod, the packaging paper bag can be bonded and pressed differently from low-efficiency manual work, a buffering mechanismprotects the sealing and adhesive pressing position of the paper bag against damage caused by too large pressure, and the buffering protection effect and the adhesive pressing effect are good.

The invention discloses a lithium battery edge trimming device. The device comprises a device body, the upper end face of the device body is provided with a workbench, a set of supporting frames placed parallelly and vertically are arranged in the middle of one side of the workbench, a mounting beam is fixedly connected between the upper ends of the supporting frames, the upper end face of the mounting beam is fixedly provided with an edge cutting air cylinder, an output end of the edge cutting air cylinder is fixedly connected with an edge cutting telescopic rod, the lower end of the edge cutting telescopic rod is fixedly connected with a limiting plate, one side end of the limiting plate is fixedly connected with a cutter with a knife edge facing downward vertically, a limiting frame isarranged between the lower ends of the supporting frames, the limiting frame is fixedly arranged at the upper end of the device body, the upper end face of the limiting frame is fixedly provided withtwo hydraulic limiting stoppers, the hydraulic limiting stoppers are both located under the limiting plate, and the two sides of each supporting frame are respectively provided with a constant temperature table and a controller. The lithium battery edge trimming device has the advantages that edge cutting, edge ironing and many kinds of edge trimming treatment are carried out during the productionof lithium batteries, the edge trimming effect is good, the hydraulic limiting stoppers are arranged, buffering and protection functions are achieved, and the service life of the device is prolonged.

The invention relates to the technical field of air conditioner packaging, in particular to a full-closed cushion packaging structure of a cabinet air conditioner. The full-closed cushion packaging structure comprises an upper packaging shell and a lower packaging shell which are oppositely arranged, wherein machine body storage slots and accessory storage slots are symmetrically formed in the middle parts of the opposite sides of the upper packaging shell and the lower packaging shell; and locking assemblies which are matched with each other are arranged at the edges of the opposite sides of the upper packaging shell and the lower packaging shell. The full-closed cushion packaging structure of a cabinet air conditioner provided by the invention has the advantages that the cabinet air conditioner and accessories are packaged in a fully closed manner to realize all-round dust prevention protection; furthermore, a certain buffer protection effect is achieved, and the phenomena of collision, extrusion and the like can be avoided; and meanwhile, a honeycomb paperboard is cancelled, so that the types and the quantity of packaging materials are reduced, production and management are facilitated, the packaging operation is simple and quick, and the working efficiency is higher.

The invention discloses a transfer positioning device for construction of an ALC light partition wall board, according to the technical scheme, a double-head motor is started, so that a second threaded rod drives a second threaded sleeve to move up and down in a driving bin, then a clamping block is driven to clamp the ALC light partition wall board, and the ALC light partition wall boards of different sizes can be effectively transferred; the ALC light partition wall boards are stacked through the lifting structure, then the double-head motor is started, the ALC light partition wall boards are loosened, automatic stacking of the ALC light partition wall boards can be achieved through the lifting structure, and the construction cost is reduced; according to the ALC light partition wall board transfer device, the first threaded sleeve and the supporting plate can be locked through cooperation of the stable accessory and the auxiliary assembly, a certain buffering protection effect is achieved, and therefore it is guaranteed that the ALC light partition wall board can be stably transferred, the falling damage phenomenon is avoided, and economic losses are avoided.

The invention discloses inclination prevention supporting equipment for a structure, and relates to the technical field of constructional engineering. The equipment comprises a supporting plate set and a bottom table; the supporting plate set comprises two supporting plates; an extensible plate is connected between the two supporting plates; one surface of the bottom table is connected with the supporting plates; a plurality of hydraulic supporting rods are connected to one surface of the supporting plate set; supporting blocks are connected with the output ends of the plurality of hydraulic supporting rods; a diagonal draw bar is connected with the other surface of the supporting plate set; the surface of one side of the bottom table is connected with a mounting plate; two ends of the diagonal draw bar are connected with the supporting plate set and the mounting plate respectively; a sliding rail is arranged on one surface of the bottom table; the bottom end of the supporting plate set is connected with a first extensible shaft; and one end of the first extensible shaft is connected with a sliding block. According to the inclination prevention supporting equipment for the structure, the supporting plate set is used for fixedly supporting a structure, the supporting plate set can transversely move through cooperation of the sliding block and a sliding rail, the equipment can effectively adapt to the actual supporting state of the structure, and the use requirements of structures of different forms and constructions are met.

The invention provides a portable lock catch type corrugated paper packaging box for beverages. The portable lock catch type corrugated paper packaging box comprises a bottom plate, side plates, panels and cover plates. The bottom plate, the side plates, the panels and the cover plates form a cuboid box body. The bottom plate, the side plates, the panels and the cover plates are integrally formed by folding the bottom plate, the side plates, the panels and the cover plates. The two opposite sides of the bottom plate are provided with the side plates. The other two sides of the bottom plate are provided with the panels. The outer ends of the panels are provided with handle plates. The two sides of the panels are provided with fixing plates. The outer ends of the side plates are provided with the cover plates. The outer ends of the cover plates are provided with middle baffles. The two middle baffles are tightly attached to each other after folding. According to the portable lock catch type corrugated paper packaging box, the corrugated paper packaging box can be tightly and fixedly combined with a corrugated paper folding component, and a corrugated paper outer packaging body also has the buffering protection effect on the upper faces and the lower faces of beverage products, that is, the corrugated paper packaging sleeving structure has a certain buffer protection effect; meanwhile, the portable lock catch type corrugated paper packaging box is compact in structure and attractive in appearance, and packaging lifting openings can be opened from the outside or opened from the interior; and stacking is facilitated due to the overall packaging is very orderly, and storage space is saved.

The invention discloses a white spirits buffering anti-crush transportation package box, and relates to the technical field of white spirits manufacturing and transportation. The white spirits buffering anti-crush transportation package box comprises an outer package box, an inner package part and an upper cover; the inner package part is positioned at the middle of an inner cavity of the outer package box; supporting columns are fixedly connected with four inner corners of the outer package box, and the number of the supporting columns is four; springs are arranged among the four supporting columns; one ends of the springs are fixedly connected with the inner cavity wall surface of the outer package box, and the other ends of the springs are fixedly connected with a sponge layer; and theouter surface of the inner package part is fixedly connected with the inner surface of the sponge layer. According to the white spirits buffering anti-crush transportation package box, protection to the white spirits is effectively improved, anti-shock protection effect is achieved, damage of internal goods during transportation is avoided, anti-crush property is excellent, and buffering protection effect is achieved; and the structure is simple, installation is convenient, fixing is firm, mutual collision between the white spirits during transportation is effectively avoided, fixity is excellent and damage is avoided.

A corrugated paper packaging container for tablet products comprises an outer corrugated paper package and two corrugated paper folding buffer components. Each corrugated paper folding buffer component comprises a buffer I and two buffer components II, and the outer corrugated paper package comprises a box body, a box cover and clamping boards, wherein one side of the box body is connected with one side of the box cover, and the clamping boards are arranged at two ends of the box cover respectively and perpendicularly connected with the box cover. The corrugated paper packaging container for the tablet products is convenient in preparation, pollution-free, easy in recovery, convenient in warehouse logistics and low in packaging cost.

The invention discloses a landscape drainage antiskid step system for a mountain park in a pluvial area, and belongs to the technical field of steps. The landscape drainage antiskid step system comprises a plurality of step units, a plurality of transition boxes, a buffer mechanism and a pumping mechanism, the step units are box bodies, the plurality of step units are arranged in a step shape and form a step body, the transition boxes are fixedly connected with the two adjacent step units, the interiors of the transition boxes communicate with the interiors of the two adjacent step units, and a water collecting groove is formed at the top of each transition box; and when a pedal is treaded, the elastic deformation of an elastic steel bar generates an elastic buffering effect on the pedal, the deformation of the elastic steel bar triggers a connecting rod to push a piston to extrude accumulated water in a water storage tank, and the reverse acting force of the accumulated water on the piston is conducted to the elastic steel bar, so that the pedal obtains a double-damping buffering effect the joints of a climber are buffered and protected, the climbing is more labor-saving, and the fatigue feeling of the climber is reduced.

A corrugated paper packaging container for tablet products comprises an outer corrugated paper package and two corrugated paper folding buffer components. Each corrugated paper folding buffer component comprises a buffer I and two buffer components II, and the outer corrugated paper package comprises a box body, a box cover and clamping boards, wherein one side of the box body is connected with one side of the box cover, and the clamping boards are arranged at two ends of the box cover respectively and perpendicularly connected with the box cover. The corrugated paper packaging container for the tablet products is convenient in preparation, pollution-free, easy in recovery, convenient in warehouse logistics and low in packaging cost.

The invention discloses a hubbed slip-on-welding flange. The hubbed slip-on-welding flange comprises a flange plate. An inner hole formed in one side of the flange plate is provided with a welding boss. An inner hole is formed in the welding boss and communicates with an inner hole formed in the center of the flange plate. An elastic ring is arranged between the flange plate and the welding boss. The two top surfaces of the elastic ring adhere to the flange plate and the welding boss correspondingly. The flange plate is further provided with a plurality of screw holes. The screw holes are distributed in a central symmetry mode with the circle center of the flange plate as a center. The flange plate is made of a composite board. The composite board sequentially comprises a polyethylene plastic layer, a rubber layer and a PVC layer. The flange plate of the hubbed slip-on-welding flange is made of the composite board, the composite board is of a three-layer structure, and the elastic rubber layer is arranged in the middle of the composite board. The elastic ring is further arranged between the flange plate and the welding boss. The rubber layer and the elastic ring which are arranged on the flange can absorb large impact force in the using process and have a buffering protection effect on the flange and a pipe body, and the application safety of the flange and the pipe body is improved.

The invention discloses a brushless motor for an electric axle. The brushless motor comprises an axle, a protective casing, a built-in fixed casing, a top cover and a brushless motor. A built-in fixedcasing is fixedly welded on the upper surface of the axle. The brushless motor is arranged inside the built-in fixed casing. The brushless motor in the device is fixed inside the built-in fixed casing. The brushless motor contacts a heat sink strip inside the built-in fixed casing. The brushless motor is stably fixed inside the built-in fixed casing, has a stable structure, and is not easy to shake. The heat sink strip has a certain heat dissipation effect. Heat dissipation holes in the built-in fixed casing enhance the heat dissipation of the brushless motor. A shock-absorbing spring in a buffer hole in the heat sink strip movably fits the outer wall of the brushless motor, which has a certain cushioning effect and enhances the stability of the brushless motor. A protective plate is arranged on the upper end of the brushless motor. The protective plate is fixed on the inner wall above the top cover through a protective casing stabilizing spring, which reduces the wear of the upper end face of the brushless motor and increases the service life of the brush motor.

The invention discloses a support performance optimized engine support. The support performance optimized engine support comprises a bottom frame, a groove, a rubber layer, a plastic rack, an inner pipe suite, a pipe orifice, a top frame, a positioning hole, small curved grooves and large curved grooves. The support performance optimized engine support is characterized in that the bottom frame isarranged at the bottom end of the entire support performance optimized engine support, the bottom of the bottom frame is provided with a positioning hole, the top frame is arranged above the bottom frame; the inside of the rubber layer is provided with the two small curved grooves and the two large curved grooves. According to the support performance optimized engine support, the bottom frame andthe top frame supports the entire support performance optimized engine support, the plastic rack inside the top frame is used for supporting the rubber layer and the inner pipe suite inside, the rubber layer can achieve certain buffer protecting effects on the inner pipe suit, and the design of the large bent grooves and the small bent grooves can enhance the integral elasticity of the rubber layer to enhance the protecting performance. The support performance optimized engine support has the advantages that the top frame and the bottom frame can accurately support an engine to optimize the integral support performance; the plastic rack replaces a cumbersome metal rack and meanwhile reduces the cost.

The invention discloses a crane lifting device. The crane lifting device comprises a box body, wherein a switch is arranged at the outer side of the box body, a storage battery is arranged at the lower end of the box body, a supporting sleeve is fixedly connected to the middle of the box body, a shaft hole is formed in the lower end of the supporting sleeve, a main shaft is rotationally connected into the shaft hole, and a bearing is fixedly installed in the supporting sleeve; the main shaft is fixedly sleeved with the bearing, a limiting ring is arranged on the outer side of the spindle, the lower end of the limiting ring makes contact with an inner ring of the bearing, a rotating table is fixedly connected to the upper end of the main shaft, a driven bevel gear is fixedly connected to the lower end of the main shaft, and a motor is fixedly installed at the lower end of the box body; and the tail end of a motor shaft of the motor is fixedly connected with a driving bevel gear, and the driving bevel gear is meshed with the driven bevel gear. The invention relates to the crane lifting device. The crane lifting device has the characteristics that the counterweight is adjustable, falling is buffered and protected, and positioning is convenient.

The invention discloses a compact elevator mounting platform, and belongs to the technical field of building machinery. The compact elevator mounting platform comprises a vertical beam assembly and a cross beam assembly, wherein an elevator and a bottom frame assembly are arranged above the cross beam assembly, the bottom frame assembly comprises corner weldments, vertical handrails are fixed to the corner weldments, and a first cross handrail and a second cross handrail are arranged between every two adjacent vertical handrails. The vertical beam assembly comprises a vertical plate and a corbel support, wherein the corbel support is fixedly connected with the cross beam assembly, a shaft sleeve and safety tongs are arranged on the vertical plate, a linkage plate and a safety lock fixing plate are fixed to the shaft sleeve, the safety tongs are connected with the linkage plate, and a safety lock is fixed to the safety lock fixing plate. The platform can stretch out and draw back in the front-back and left-right directions, can be suitable for elevator shafts of different sizes, is wide in application range, compact in structure and convenient and fast to install, and does not occupy too much installation space; and the safety lock and the safety tongs have double protection functions, and safety and reliability are achieved.