Boarding device

Abstract

The invention belongs to the technical field of aircraft industry mechanical equipment, and particularly relates to a boarding device which comprises a chassis and a ladder body, the chassis comprises a front chassis and a rear chassis which are detachably connected, the ladder body comprises a front ladder body and a rear ladder body, and the front ladder body is connected with the front chassis through a front ladder body lifting supporting mechanism; the front end of the rear ladder body is detachably connected with the front ladder body lifting and supporting mechanism, the front end of the rear ladder body is driven by the front ladder body lifting and supporting mechanism, the front ladder body comprises an upper ladder, the front ladder body lifting and supporting mechanism comprises a ladder body lifting mechanism, an upper frame and an upper ladder adjusting and driving cylinder, and hanging pin shafts are arranged on the left side and the right side of the rear end of the upper frame. Hanging hooks are arranged on the two sides of the upper end of the rear ladder body, the upper ends of the hanging hooks are connected with the hanging pin shafts in a matched and hanging mode, and the rear ladder body comprises a middle ladder and a lower ladder which are connected with the rear chassis in a sliding mode; the boarding ladder is not used and can be disassembled, the occupied space is small, transportation and dragging are convenient, the boarding ladder is stable and limited in structure, the side boards can be disassembled and assembled, and installation is rapid and convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical equipment in the aviation industry, and specifically refers to a boarding device. Background Art

[0002] A boarding ladder is a ladder that connects the ground and the aircraft door for passengers, crew members, ground crew, and maintenance personnel to get on and off the plane. Some boarding ladders are built into the aircraft door and are opened after the plane lands and stops stably. This type is usually suitable for small business jets. Another type of boarding ladder is movable, not inside the aircraft, with its own rollers or loaded on a vehicle and can move freely. After retrieval, Chinese Patent CN113277110A discloses a passenger boarding ladder, which includes a chassis and a fixed ladder arranged obliquely. One end of the chassis is hinged with a support frame that extends obliquely upward toward the other end. A driving component capable of driving the support frame to swing around the hinge point between it and the chassis is arranged on the upper side of the chassis. A sliding ladder capable of reciprocatingly moving along its length direction is connected to the support frame. The fixed ladder is arranged in the same direction as the sliding ladder. The lower end of the fixed ladder is hinged on the support frame and the upper end overlaps the sliding ladder. The deficiencies of the above patent are as follows: First, the fixed ladder in the above patent is a whole. When the fixed ladder is not in use, it needs to be transported or dragged as a whole, resulting in high transportation costs and large occupied space. Second, when there is a problem with the fixed ladder or the sliding ladder, it needs to be replaced as a whole, resulting in high maintenance costs. Third, there is no limit between the fixed ladder and the sliding ladder on the platform in the above patent, and the sliding ladder is prone to sliding. When there are a large number of tourists, stepping on it may cause sliding, resulting in panic. Fourth, the side rails installed on the docking platform or the fixed ladder in the above patent are fixed, which makes the entire boarding ladder unusable once there is a problem and needs to wait for maintenance, and the maintenance time is unknown, greatly reducing the boarding efficiency of the boarding ladder. Fifth, the structure of the docking platform in the above patent is fixed, and it occupies a large space when not in use. Sixth, the lifting mechanism in the above patent is simple, with limited supporting force, and the structure may be unstable. When there are a large number of tourists, stepping on it may cause shaking. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies of the prior art and provide a boarding device that can be disassembled when not in use, occupies a small space, is convenient for transportation and dragging, has a stable structure with limited position, the side rails can be disassembled and installed quickly and conveniently.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: A boarding device, comprising a chassis and a ladder body, characterized in that: the chassis comprises a front chassis and a rear chassis, the front chassis and the rear chassis are detachably connected, the ladder body comprises a front ladder body and a rear ladder body, a front ladder body lifting support mechanism is arranged between the front ladder body and the front chassis, the front ladder body is driven by the front ladder body lifting support mechanism, the front end of the rear ladder body is detachably connected with the front ladder body lifting support mechanism, the rear ladder body is driven by the front ladder body lifting support mechanism, the rear ladder body and the front ladder body cooperate to form the whole ladder body, the lower end of the rear ladder body is movably connected with the rear chassis, so as to facilitate the lifting of the front ladder body and the rear ladder body by the front ladder body lifting support mechanism, and at the same time, the front ladder body and the rear ladder body can be separated, the front chassis and the rear chassis can be separated, the front ladder body is connected with the front chassis, and the rear ladder body is connected with the rear chassis, so that the whole boarding ladder forms a two-part structure, which occupies less space when stored and is convenient for transportation when not in use.

[0005] In the present invention, the front ladder body comprises an upper ladder, and the front ladder body lifting support mechanism comprises a ladder body lifting mechanism, an upper frame and an upper ladder adjusting driving cylinder. The lower end of the ladder body lifting mechanism is connected with the front chassis, and the upper end is connected with the upper frame. The upper frame is provided with the upper ladder. Hanging pins are arranged on the left and right sides of the rear end of the upper frame, and both ends of the hanging pins are fixedly connected with the upper frame. An upper ladder adjusting driving cylinder is arranged between the upper ladder and the upper frame. The lower end of the upper ladder is hinged with the upper frame, and the front part of the upper ladder is connected with the upper frame through the upper ladder adjusting driving cylinder, so as to drive the upper ladder through the upper ladder adjusting driving cylinder. When not in use, the upper ladder adjusting driving cylinder retracts, the upper ladder falls on the upper frame, and the upper frame is driven by the upper ladder adjusting driving cylinder. Hanging hooks are arranged on both sides of the upper end of the rear ladder body, and the upper end of the hanging hook is cooperatively and hangingly connected with the hanging pin, and the lower end of the hanging hook is fixedly connected with the rear ladder body.

[0006] In the present invention, the rear ladder body comprises an intermediate ladder and a lower ladder. Lower tracks are arranged at both ends of the rear chassis, the lower tracks are located at the upper end of the rear chassis, and the lower tracks are fixedly connected with the rear chassis. Upper tracks are arranged on the lower tracks, and the upper tracks are fixedly connected with the rear chassis. Hanging hooks are fixedly arranged on both sides of the upper end of the intermediate ladder, rollers are installed on both sides of the lower end of the intermediate ladder, and the lower end of the intermediate ladder is movably connected with the upper track of the rear chassis through the rollers. Rollers are installed on both sides of the upper end of the lower ladder, and the upper end of the lower ladder is movably connected with the lower track of the rear chassis through the rollers. Support wheels are installed on both sides of the lower end of the lower ladder, so as to facilitate that when not in use, the ladder body lifting mechanism drives the upper ladder to move downward and be stored above the front chassis, the upper ladder lifting mechanism drives the upper frame to move downward, the hanging pin of the upper frame is disengaged from the hanging hook downward, the intermediate ladder rotates downward and moves backward, and is stored in the upper track of the rear chassis, the lower ladder can rotate upward and then move forward, and is stored in the lower track of the rear chassis. Pull out the connecting pin, and the front and rear chassis are separated, which is convenient for disassembly, installation and transportation.

[0007] At the front end of the rear chassis of the present invention, a rear connection seat is fixedly provided. At the rear end of the front chassis, a front connection seat is fixedly provided. Pin shaft holes are respectively provided on the rear connection seat and the front connection seat. A connection pin shaft is inserted through the pin shaft holes. The rear chassis is fixedly connected to the front chassis through the connection pin shaft and the pin shaft holes, so as to facilitate pulling out the connection pin shaft to separate the front chassis and the rear chassis, and inserting the connection pin shaft to fix the front chassis and the rear chassis.

[0008] At the front end of the upper ladder of the present invention, a docking platform is provided. The front end of the upper ladder is hinged to the rear end of the docking platform. A platform support rod is provided between the upper ladder and the docking platform. A support pin shaft hole is provided at the front end of the platform support rod. A platform pin shaft hole is provided at the lower end of the docking platform. The front end of the platform support rod is hinged to the docking platform through a support pin shaft, the support pin shaft hole and the platform pin shaft hole, and the rear end is hinged to the upper ladder, so as to facilitate pulling out the support pin shaft, enabling the docking platform to rotate around the hinge point between the docking platform and the upper ladder, which is convenient for storage.

[0009] The docking platform of the present invention includes a platform frame and platform sidewalls. Platform sidewalls are provided on both the left and right sides of the platform frame. A platform sidewall connection mechanism is provided between the platform sidewalls and the platform frame. The platform sidewall connection mechanism includes platform rollers, connection clamping plates, compression springs, platform guide rails, and limit connection plates. Platform rollers are provided on the left side of the platform frame from front to back, and platform rollers are provided on the right side of the platform frame from front to back. The platform rollers are installed on a platform shaft through bearings, and the platform shaft is fixed to the platform frame. Connection clamping plates are provided on both the left and right sides of the platform frame. One end of the connection clamping plate is fixedly connected to the platform frame through a compression spring, and the other end extends outward and downward to form a clamping block. A platform guide rail is provided at the lower end of the platform sidewall, and the platform guide rail is fixedly connected to the platform sidewall. The platform guide rail is matched with the platform rollers. The platform sidewall is slidably connected to the platform frame through the platform guide rail and the platform rollers, so as to install the platform sidewall on the platform frame through the platform guide rail and the platform rollers. A limit connection plate is provided on the platform guide rail. One side of the limit connection plate is fixedly connected to the platform sidewall, and the other side is provided with limit blocks at intervals from front to back. The clamping block is inserted between adjacent limit blocks to fixedly connect the platform sidewall to the platform frame, so as to step on the connection clamping plate to compress the spring, causing the clamping block to lift, sliding the platform sidewall into the platform frame, releasing the connection clamping plate, and the spring rebounds, and the clamping block is stuck between adjacent limit blocks to fix the relative position of the platform sidewall to the platform frame.

[0010] On the platform frame of the present invention, there is provided a platform sidewall guiding mechanism. The platform sidewall guiding mechanism includes sidewall columns, inner guiding seats, inner rollers, outer guiding seats, outer rollers, and guiding pins. There are sidewall columns provided on the inner side of the platform sidewall. The sidewall columns are detachably connected to each other. Inner guiding seats are provided on the sidewall columns. One side of the inner guiding seat is fixedly connected to the sidewall column, and the other side is provided with a connecting slot. Inner rollers are provided on the inner guiding seat. Slot pin holes are provided on the connecting slot. The inner rollers are installed on inner roller shafts. The upper and lower ends of the inner roller shafts are fixedly connected to the inner guiding seat. The outer guiding seat is provided with a plug rod and outer rollers. The upper end of the plug rod is fixedly connected to the outer guiding seat. The plug rod is hollow. Plug rod pin holes are provided on the plug rod. The plug rod is inserted into the connecting slot. The guiding pin passes through the slot pin hole and the plug rod pin hole to fixedly connect the plug rod to the inner guiding seat. The outer rollers are spaced opposite to the inner rollers. One side of the platform sidewall abuts against the inner rollers, and the other side abuts against the outer rollers. The outer rollers are sleeved on outer roller shafts. The upper and lower ends of the outer roller shafts are fixedly connected to the outer guiding seat, so as to guide the forward and backward movement of the platform sidewall through the inner rollers and the outer rollers.

[0011] At the lower end of the sidewall column of the present invention, there is provided a guiding rod. Threaded holes are provided at the lower end of the sidewall column. Guiding grooves are provided on the platform frame. The upper end of the guiding rod is fixedly connected to the sidewall column, and the lower end is inserted into the guiding groove. The sidewall column is threadedly connected to the platform frame through screws, so as to facilitate the disassembly and assembly of the sidewall column.

[0012] A ladder limit connection mechanism is provided between the middle ladder and the lower ladder of the present invention. The ladder limit connection mechanism includes a limit plate, a ladder limit fixing seat, a baffle, a limit spring, and a limit handle. Limit plates are respectively provided on both sides of the rear part of the lower end of the middle ladder. The limit plates are fixedly connected to the middle ladder. A limit slot is provided at the lower end of the limit plate. The lower ladder includes a first ladder and a second ladder. Rollers are respectively installed on both sides of the first ladder. The first ladder is slidably connected to the lower track of the rear chassis through the rollers. The rear end of the first ladder is hinged to the front end of the second ladder. Ladder limit fixing seats are provided on both sides of the front end of the first ladder. The ladder limit fixing seats are fixedly connected to the first ladder. A limit perforation is provided on the ladder limit fixing seat. A baffle is inserted into the limit perforation. A limit spring is provided in the limit perforation. The baffle includes an upper baffle section and a lower baffle section. The upper end of the upper baffle section is inserted into the limit slot to limit and fix the front and rear positions of the first ladder and the middle ladder. The lower end of the upper baffle section is fixedly connected to the lower baffle section. The outer diameter of the upper baffle section is larger than that of the lower baffle section. The lower end of the lower baffle section passes through the limit perforation and is provided with a limit handle. The lower baffle section is fixedly connected to the limit handle. The limit spring is sleeved on the lower baffle section. One end of the limit spring abuts against the lower end face of the upper end of the baffle, and the other end abuts against the ladder limit fixing seat. The outer diameter of the limit handle is larger than the inner diameter of the limit perforation, so that when it is necessary to retract the lower ladder, the limit handle is manually pulled downward to compress the limit spring, and the upper end of the upper baffle section is disengaged from the limit slot. Then, the second ladder is lifted, and the second ladder is rotated upward around its hinge point with the first ladder. After turning to the horizontal position, the second ladder is pushed forward, and the first ladder drives the second ladder to move forward along the lower track to retract the entire lower ladder. When it is necessary to deploy the lower ladder, the second ladder is pulled out backward and then rotated downward. The upper end of the upper baffle section at the front end of the first ladder enters the limit slot to realize automatic limiting of the first ladder and the middle ladder.

[0013] The front end surface of the limit plate of the present invention extends downward and backward to form a guiding surface to facilitate the automatic sliding of the upper baffle section into the limit slot along the guiding surface.

[0014] The platform frame of the present invention is provided with a platform foldable connection mechanism. The platform foldable connection mechanism includes a front hinge block, a hinge connecting plate, a front connection block, a rear hinge block, a rear connection block, and a connection pin. The platform frame includes a front section of the platform and a rear section of the platform. The rear end of the front section of the platform is provided with a front hinge block. The front end of the front hinge block is fixedly connected to the front section of the platform, and the rear end is provided with a hinge shaft hole. On both sides of the front hinge block, there are hinge connecting plates. The lower end of the front hinge block is provided with a front connection block. The front connection block is fixedly connected to the front hinge block. The rear end of the front connection block extends backward and is provided with a front connection pin hole. The front end of the rear section of the platform is provided with a rear hinge block. The front end of the rear hinge block is provided with a hinge shaft hole, and the rear end is fixedly connected to the rear section of the platform. The lower end of the rear hinge block is provided with a rear connection block. The rear connection block is fixedly connected to the rear hinge block. The front end of the rear connection block extends forward and is provided with a rear connection pin hole. The front end of the hinge connecting plate is hinged to the front hinge block through a front hinge shaft, and the rear end is hinged to the rear hinge block through a rear hinge shaft. The rear end of the front connection block and the front end of the rear connection block face each other. The front connection block and the rear connection block are fixedly connected through a connection pin, a front connection pin hole, and a rear connection pin hole. It is beneficial to pull out the connection pin, and the front section of the platform can rotate relative to the rear section of the platform around the front hinge shaft and fold with the rear section of the platform.

[0015] A flip pedal is provided between the front section of the platform and the rear section of the platform in the present invention. The front end face of the flip pedal abuts against the rear end face of the front section of the platform, and the rear end face abuts against the front end face of the rear section of the platform. The rear end of the flip pedal is hinged to the rear section of the platform. The lower end face of the flip pedal is provided with a flip connection block. The flip connection block is fixedly connected to the flip pedal. The flip connection block is provided with a flip pin hole. The rear end face of the front section of the platform is provided with a flip connection pin hole. A flip pin passes through the flip pin hole and the flip connection pin hole to fixedly connect the flip connection block to the front section of the platform, and further fix the flip pedal between the front section of the platform and the rear section of the platform. When the front section of the platform and the rear section of the platform need to be folded in half, pull out the flip pin, flip the flip pedal backward, and let it fall on the rear section of the platform. Then, flip the front section of the platform backward and let it fall on the rear section of the platform.

[0016] A platform folding limit mechanism is provided between the front section of the platform and the rear section of the platform in the present invention. The platform folding limit mechanism includes a platform limit shaft, a platform limit hook, a hook pin shaft, and a torsion spring. At least one side of the front section of the platform is provided with a platform limit shaft. The platform limit shaft is fixedly connected to the front section of the platform. At least one side of the rear section of the platform is provided with a platform limit hook. The platform limit hook is hinged to the rear section of the platform through a hook pin shaft. A torsion spring is sleeved on the hook pin shaft. The platform limit hook is limit-connected to the rear section of the platform through the torsion spring. When the front section of the platform and the rear section of the platform are folded, the platform limit hook hooks the platform limit shaft to limit-connect the front section of the platform and the rear section of the platform, so that the hook end of the platform limit hook has a tendency to rotate backward through the torsion spring, prompting the limit hook to tightly hook the limit shaft.

[0017] On both sides of the upper ladder of the present invention, there are ladder side gunnels. On both sides of the middle ladder, there are ladder side gunnels. On both sides of the second ladder, there are ladder side gunnels. At the lower end of the ladder side gunnel, there is a ladder side gunnel quick connection mechanism. The ladder side gunnel quick connection mechanism includes a side gunnel connection frame, a locking screw, and a plug column. On both sides of the upper ladder, a side gunnel connection frame is fixedly provided. On both sides of the middle ladder, a side gunnel connection frame is fixedly provided. On both sides of the second ladder, a side gunnel connection frame is fixedly provided. At the upper end of the side gunnel connection frame, there is a side gunnel slot. At intervals on the side gunnel connection frame, there are plug holes. On the side of the plug hole, there is a locking hole which is communicated with the plug hole. A locking screw is provided in the locking hole. At intervals at the lower end of the ladder side gunnel, there are plug columns. The upper end of the plug column is fixedly connected to the ladder side gunnel. The outer diameter of the upper end of the plug column matches the inner diameter of the plug hole. The outer diameter of the upper part of the plug column is larger than the outer diameter of the lower part of the plug column. The lower end of the ladder side gunnel is snapped into the side gunnel slot. The plug column is inserted into the plug hole. The locking screw passes through the locking hole and abuts against the plug column. The locking screw is threadedly connected to the side gunnel connection frame to fixedly connect the ladder side gunnel and the side gunnel connection frame. By rotating the locking screw, the locking screw can be made to press against the plug column to fix the ladder side gunnel and the side gunnel connection frame. Unscrew the locking screw and pull out the ladder side gunnel. When the plug column is disengaged from the plug hole, the ladder side gunnel and the side gunnel connection frame can be separated.

[0018] The ladder lifting mechanism of the present invention includes a simple supported beam group and a lifting drive cylinder. On both sides of the front chassis, the simple supported beam group is symmetrically provided. The simple supported beam group includes an outer lower simple supported beam, an inner lower simple supported beam, an outer upper simple supported beam, and an inner upper simple supported beam. On both sides of the front chassis, there are lifting guide rails. On both sides of the front part of the front chassis, there are outer lower simple supported beams. On both sides of the rear part of the front chassis, there are inner lower simple supported beams. At the lower end of the outer lower simple supported beam, a roller is installed. The outer lower simple supported beam is slidably connected to the front chassis through the roller and the lifting guide rail. The middle part of the outer lower simple supported beam is hinged to the inner lower simple supported beam on the same side. At the upper end of the outer lower simple supported beam, there is an outer upper simple supported beam. At the lower end of the inner lower simple supported beam, it is hinged to the front chassis, and at the upper end, there is an inner upper simple supported beam. At the lower end of the outer upper simple supported beam, it is hinged to the outer lower simple supported beam. The middle part of the outer upper simple supported beam is hinged to the inner upper simple supported beam on the same side. At the upper end of the outer upper simple supported beam, there is a roller. At the lower end of the inner upper simple supported beam, it is hinged to the inner lower simple supported beam, and at the upper end, it is hinged to the upper frame. On both sides of the upper frame, there are frame guide rails. The outer upper simple supported beam is slidably connected to the upper frame through the roller and the frame guide rail. Between the two outer lower simple supported beams on both sides of the front chassis, there is a connecting beam. Between the two inner lower simple supported beams, there is a connecting beam. Between the two outer upper simple supported beams, there is a connecting beam. Between the two inner upper simple supported beams, there is a connecting beam to achieve synchronous lifting of the two groups of simple supported beam groups. Between the inner upper simple supported beam and the inner lower simple supported beam, there is a lifting drive cylinder. One end of the lifting drive cylinder is hinged to the inner upper simple supported beam, and the other end is hinged to the inner lower simple supported beam to facilitate driving the simple supported beam group to lift through the lifting drive cylinder.

[0019] A retractable support mechanism is provided between the front chassis and the upper frame of the present invention. The retractable support mechanism includes a front retractable rod and a rear retractable rod. The front retractable rods are respectively provided on both sides of the front end of the upper frame, and the rear retractable rods are respectively provided on both sides of the rear end of the upper frame. The front retractable rod and the rear retractable rod are respectively telescopic rods. The upper end of the front retractable rod is hinged to the upper frame, and the lower end is detachably connected to the front chassis. The upper end of the rear retractable rod is hinged to the upper frame, and the lower end is detachably connected to the front chassis, so as to facilitate detaching the front retractable rod and the rear retractable rod from the front chassis when not in use, and rotating the front retractable rod and the rear retractable frame to the horizontal and retracting them respectively around their hinge points with the upper frame.

[0020] Front guiding and limiting rollers are provided on the inner upper simple supported beam on the same side of the front retractable rod of the present invention. The front retractable rod includes a front upper support rod and a front lower support rod. The upper end of the front upper support rod is hinged to the upper frame, and the lower end is inserted into the front lower support rod. The front upper support rod is slidably connected to the front lower support rod. A front upper pin hole is provided in the lower part of the front upper support rod, and a front lower pin hole is provided in the upper part of the front lower support rod. The lower end of the front lower support rod is detachably connected to the front chassis. The front upper support rod is fixedly connected to the front lower support rod through a front locking pin, the front upper pin hole and the front lower pin hole. A front clamping plate is provided on the side wall of the front lower support rod. The front clamping plate is fixedly connected to the front lower support rod. A clamping slot is provided on the front clamping plate. The front guiding and limiting roller is placed in the clamping slot of the front clamping plate, and the front guiding and limiting roller abuts against the front clamping plate to limit the front lower support rod on the inner upper simple supported beam. Rear guiding and limiting rollers are provided on the outer lower simple supported beam on the same side of the rear retractable rod. The rear retractable rod includes a rear upper support rod and a rear lower support rod. The upper end of the rear upper support rod is hinged to the upper frame, and the lower end is inserted into the rear lower support rod. The rear upper support rod is slidably connected to the rear lower support rod. A rear upper pin hole is provided in the lower part of the rear upper support rod, and a rear lower pin hole is provided in the upper part of the rear lower support rod. The lower end of the rear lower support rod is detachably connected to the front chassis. The rear upper support rod is fixedly connected to the rear lower support rod through a rear locking pin, the rear upper pin hole and the rear lower pin hole. A rear clamping plate is provided on the side wall of the rear lower support rod. The rear clamping plate is fixedly connected to the rear lower support rod. A clamping slot is provided on the rear clamping plate. The rear guiding and limiting roller is placed in the clamping slot of the rear clamping plate, and the rear guiding and limiting roller abuts against the rear clamping plate to limit the rear lower support rod on the outer lower simple supported beam, so as to facilitate hanging the front lower support rod on the front guiding and limiting roller and the rear lower support rod on the rear guiding and limiting roller, and the front retractable rod and the rear retractable rod can be telescoped as the ladder body lifting mechanism lifts and lowers.

[0021] At the lower end of the front lower support rod of the present invention, there is a connecting groove. At the lower end of the rear lower support rod, there is also a connecting groove. A connecting pin shaft hole is provided on the connecting groove. On both sides of the front end and both sides of the rear end of the front chassis, there are insertion rods respectively. The lower end of the insertion rod is fixedly connected to the front chassis. A positioning pin hole is provided on the insertion rod. The insertion rod is inserted into the connecting groove, and a positioning pin passes through the connecting pin shaft hole and the positioning pin hole to fixedly connect the front lower support rod or the rear lower support rod with the insertion rod. After the ladder body lifting mechanism raises the upper frame, the front lower support rod is taken off from the front guiding and limiting roller, the lower end of the front lower support rod is inserted on the insertion rod, and the front lower support rod and the front upper support rod are locked by a front locking pin, so that the front upper support rod and the front lower support rod support the upper frame. Similarly, the rear retractable rod can also support the upper frame.

[0022] On the ladder body lifting mechanism of the present invention, there is a frame automatic height measuring mechanism. The frame automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. An induction frame is provided between the inner upper simply supported beam and the inner lower simply supported beam. An induction groove is provided on the induction frame. The upper end of the induction plate is hinged to the inner upper simply supported beam, and the induction plate is placed in the induction groove and slidably connected to the induction frame. Along the sliding direction of the induction plate, induction holes are spaced on the induction plate. The upper end of the induction groove is provided with an inductor, and the lower end is hinged to the inner lower simply supported beam. The inductor is fixedly connected to the induction frame, and the inductor cooperates with the induction holes for induction, so as to read the length of the induction plate extending out by the inductor sensing the number of induction holes.

[0023] Between the upper frame and the upper ladder of the present invention, there is an upper ladder automatic height measuring mechanism. The upper ladder automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. An induction frame is provided on the upper frame. An induction groove is provided on the induction frame, and an induction plate is provided in the induction groove. The lower end of the induction frame is hinged to the upper frame. The induction plate is slidably connected to the induction frame. The upper end of the induction plate is hinged to the upper ladder. Along the sliding direction of the induction plate, induction holes are spaced on the induction plate. The upper end of the induction groove is provided with an inductor. The inductor is fixedly connected to the induction frame, and the inductor cooperates with the induction holes for induction, so as to read the length of the induction plate extending out by the inductor sensing the number of induction holes.

[0024] On the upper ladder adjusting drive cylinder of the present invention, there is a support locking mechanism. The support locking mechanism includes teeth, a pawl drive cylinder, and a pawl. Teeth are fixedly provided on the rod wall of the telescopic rod of the upper ladder adjusting drive cylinder. A pawl drive cylinder is provided on the cylinder seat of the upper ladder adjusting drive cylinder. A pawl is fixedly connected to the telescopic rod of the pawl drive cylinder. The pawl cooperates with the teeth to lock the position of the telescopic rod of the upper ladder adjusting drive cylinder, so as to prevent the telescopic rod of the upper ladder adjusting drive cylinder from sliding when the upper ladder adjusting drive cylinder supports the upper ladder.

[0025] The ratchet driving cylinder of the present invention is provided with a ratchet clamping mechanism. The ratchet clamping mechanism includes a clamping adjustment plate, a first pin shaft, a second pin shaft, a clamping spring, a ratchet shaft connecting plate, and a ratchet shaft. The telescopic rod of the ratchet driving cylinder is provided with a clamping adjustment plate. One end of the clamping adjustment plate is provided with a first pin shaft, and the other end is provided with a second pin shaft. Clamping springs are arranged on both sides of the clamping adjustment plate. One end of the clamping adjustment plate is provided with a shaft hole, and the other end is provided with a long hole. The clamping adjustment plate is hinged to the telescopic rod of the ratchet driving cylinder through the first pin shaft. The second pin shaft passes through the long hole, and ratchet shaft connecting plates are arranged at both ends of the second pin shaft. One end of the ratchet shaft connecting plate is fixedly connected to the second pin shaft, and the other end is fixedly connected to the ratchet shaft. The ratchet is fixedly arranged on the ratchet shaft. One end of the clamping spring is connected to the first pin shaft, and the other end is connected to the second pin shaft. When the telescopic rod of the ratchet driving cylinder extends, the front end of the clamping adjustment plate drives the ratchet shaft to rotate. The ratchet shaft drives the ratchet to engage with the teeth. The clamping spring is compressed. There is a long hole at the front end of the clamping adjustment plate, so that after the clamping spring is compressed, it drives the second pin shaft to rotate towards the teeth, prompting the ratchet to be in close contact with the teeth.

[0026] A retracting pin hole is arranged between the two ends of the platform support rod of the present invention, which facilitates the downward rotation of the docking platform and its accommodation on the front side of the front chassis after removing the offline support pin. At this time, the support pin can be inserted into the retracting pin hole and the platform pin hole to fix the docking platform to the upper ladder, thus avoiding the shaking of the docking platform during transportation.

[0027] Due to the adoption of the above structure, the present invention has the advantages that the boarding ladder can be disassembled when not in use, occupies a small space, is convenient for transportation and dragging, has a stable structure with limited position, the side hull can be disassembled and assembled, and the installation is fast and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the present invention from one angle.

[0029] Figure 2 It is a schematic structural diagram of the present invention from another angle.

[0030] Figure 3 It is a schematic structural diagram of the present invention from yet another angle.

[0031] Figure 4 It is the front view of the present invention.

[0032] Figure 5 It is a schematic structural diagram on the front chassis after the present invention is disassembled.

[0033] Figure 6 It is a schematic structural diagram on the rear chassis after the present invention is disassembled.

[0034] Figure 7 It is an enlarged schematic diagram of the docking platform of the present invention.

[0035] Figure 8 It is a schematic structural diagram of the platform framework of the present invention.

[0036] Figure 9 It is a side view of the platform framework of the present invention.

[0037] Figure 10 It is a schematic structural diagram after the platform framework of the present invention is folded.

[0038] Figure 11 It is an enlarged schematic diagram of the docking platform in the present invention with one side platform sideboard removed.

[0039] Figure 12 It is an enlarged schematic diagram of the connection card board of the present invention.

[0040] Figure 13 It is an enlarged schematic diagram of the platform sideboard guiding mechanism of the present invention.

[0041] Figure 14 It is an enlarged schematic diagram of the inner guiding seat and the outer guiding seat of the present invention.

[0042] Figure 15 It is an exploded schematic diagram of the inner guiding seat and the outer guiding seat of the present invention.

[0043] Figure 16 It is an enlarged schematic diagram of the ladder body lifting mechanism and the retractable support mechanism of the present invention.

[0044] Figure 17 is of the present invention Figure 16 Schematic structural diagram after contraction.

[0045] Figure 18 It is a schematic diagram of the state where the retractable support mechanism extends with the ladder body lifting mechanism in the present invention.

[0046] Figure 19 It is an enlarged schematic diagram of the simply supported beam group in the present invention.

[0047] Figure 20 It is an enlarged schematic diagram of the support locking mechanism and the pawl clamping mechanism in the present invention. Figure 21 It is a schematic structural diagram of the pawl clamping mechanism in the present invention with one side pawl shaft connecting plate removed.

[0048] Figure 22 It is an enlarged schematic diagram of the upper ladder automatic height measuring mechanism of the present invention.

[0049] Figure 23 It is an enlarged schematic diagram of the framework automatic height measuring mechanism of the present invention.

[0050] Figure 24 It is an enlarged schematic diagram of a certain angle of the ladder body sideboard quick connection mechanism of the present invention.

[0051] Figure 25 It is an enlarged schematic view of another angle of the quick connection mechanism of the trapezoidal side hull of the present invention.

[0052] Figure 26 It is an enlarged schematic view of the ladder limit connection mechanism of the present invention.

[0053] Figure 27 It is a schematic view of the state where the limit of the ladder limit connection mechanism of the present invention is released.

[0054] Figure 28 It is the present invention Figure 4 Enlarged view of part A in.

[0055] Figure 29 It is the present invention Figure 4 Enlarged view of part of the ladder limit connection mechanism in.

[0056] Reference Numerals: chassis 1, ladder body 2, docking platform 3, upper ladder 4, middle ladder 5, lower ladder 6, front chassis 7, rear chassis 8, ladder body lifting mechanism 9, upper frame 10, hanging pin 11, upper ladder adjustment drive cylinder 12, platform support rod 13, rear connecting seat 14, front connecting seat 15, lower track 16, upper track 17, hanging hook 18, support wheel 19, platform frame 20, platform sidewall 21, platform sidewall connecting mechanism 22, platform roller 23, connecting card plate 24, pressing spring 25, platform guide rail 26, limit connecting plate 27, block 28, limit block 29, platform sidewall guiding mechanism 30, sidewall column 31, inner guiding seat 32, inner roller 33, outer guiding seat 34, outer roller 35, guiding pin 36, guiding rod 37, inserting rod 38, ladder limit connecting mechanism 39, limit plate 40, ladder limit fixing seat 41, baffle 42, limit spring 43, limit handle 44, limit slot 45, first ladder 46, second ladder 47, upper section of baffle 48, lower section of baffle 49, platform foldable connecting mechanism 50, front hinge block 51, hinge connecting plate 52, front connecting block 53, rear hinge block 54, rear connecting block 55, connecting pin 56, front section of platform 57, rear section of platform 58, flipping pedal 59, flipping connecting block 60, flipping pin 61, platform folding limit mechanism 62, platform limit shaft 63, platform limit hook 64, hook pin 65, torsion spring 66, ladder body sidewall 67, ladder body sidewall quick connecting mechanism 68, sidewall connecting frame 69, locking screw 70, inserting column 71, sidewall card slot 72, inserting hole 73, simple support beam group 74, lifting drive cylinder 75, outer lower simple support beam 76, inner lower simple support beam 77, outer upper simple support beam 78, inner upper simple support beam 79, connecting beam 80, retracting and extending support mechanism 81, front retracting and extending rod 82, rear retracting and extending rod 83, front guiding and limiting roller 84, front locking pin 85, front card plate 86, rear guiding and limiting roller 87, inserting rod 88, rear card plate 89, positioning pin 90, front upper support rod 91, front lower support rod 92, rear upper support rod 93, rear lower support rod 94, frame automatic height measuring mechanism 95, induction frame 96, induction plate 97, inductor 98, induction hole 99, upper ladder automatic height measuring mechanism 100, support locking mechanism 101, tooth 102, pawl drive cylinder 103, pawl 104, pawl clamping mechanism 105, clamping adjustment plate 106, first pin 107, second pin 108, clamping spring 109, pawl shaft connecting plate 110, pawl shaft 111, long slot 112. Detailed Embodiment

[0057] The following combines with the attached drawings to further describe in detail the specific embodiments of the present invention.

[0058] A boarding device, comprising a chassis 1 and a ladder body 2, with a docking platform 3 installed at the front end of the ladder body 2, characterized in that: the ladder body 2 includes an upper ladder 4, a middle ladder 5 and a lower ladder 6, the chassis 1 includes a front chassis 7 and a rear chassis 8, a ladder lifting mechanism 9 is provided on the front chassis 7, an upper frame 10 is provided at the upper end of the ladder lifting mechanism 9, the lower end of the ladder lifting mechanism 9 is connected to the front chassis 7, and the upper end is connected to the upper frame 10. The upper ladder 4 is provided on the upper frame 10. Hanging pins 11 are provided on the left and right sides at the rear end of the upper frame 10, and both ends of the hanging pins 11 are fixedly connected to the upper frame 10. An upper ladder adjustment driving cylinder 12 is provided between the upper ladder 4 and the upper frame 10. The lower end of the upper ladder 4 is hinged to the upper frame 10, and the front part of the upper ladder 4 is connected to the upper frame 10 through the upper ladder adjustment driving cylinder 12 to drive the upper ladder through the upper ladder adjustment driving cylinder. When not in use, the upper ladder adjustment driving cylinder retracts, and the upper ladder falls on the upper frame. The upper frame is driven by the upper ladder adjustment driving cylinder. The front end of the upper ladder 4 is hinged to the rear end of the docking platform 3. A platform support rod 13 is provided between the upper ladder 4 and the docking platform 3. The front end of the platform support rod 13 is provided with a support pin hole, and the lower end of the docking platform 3 is provided with a platform pin hole. The front end of the platform support rod 13 is hinged to the docking platform 3 through a support pin, a support pin hole and a platform pin hole, and the rear end is hinged to the upper ladder 4 to facilitate pulling out the support pin, enabling the docking platform to rotate around the hinge point between the docking platform and the upper ladder, facilitating storage. A rear connection seat 14 is fixedly provided at the front end of the vehicle frame of the rear chassis 8, and a front connection seat 15 is fixedly provided at the rear end of the vehicle frame of the front chassis 7. Pin holes are respectively provided on the rear connection seat 14 and the front connection seat 15, and a connecting pin is passed through the pin holes. The rear chassis 8 is fixedly connected to the front chassis 7 through the connecting pin and the pin holes to facilitate pulling out the connecting pin to separate the front chassis and the rear chassis, and inserting the connecting pin to fix the front chassis and the rear chassis. Lower rails 16 are provided at both ends of the rear chassis 8, and the lower rails 16 are located on the vehicle frame of the rear chassis 8 and are fixedly connected to the vehicle frame of the rear chassis 8. Upper rails 17 are provided on the lower rails 16, and the upper rails 17 are fixedly connected to the vehicle frame of the rear chassis 8. Hanging hooks 18 are provided on both sides at the upper end of the middle ladder 5, and the upper ends of the hanging hooks 18 are engaged and connected with the hanging pins 11. The lower ends of the hanging hooks 18 are fixedly connected to the middle ladder 5. Rollers are installed on both sides at the lower end of the middle ladder 5, and the lower end of the middle ladder 5 is movably connected to the upper rail 17 of the rear chassis 8 through the rollers. Rollers are installed on both sides at the upper end of the lower ladder 6, and the upper end of the lower ladder 6 is movably connected to the lower rail 16 of the rear chassis 8 through the rollers. Support wheels 19 are installed on both sides at the lower end of the lower ladder 6 to facilitate, when not in use, the ladder lifting mechanism driving the upper ladder to move downward and be stored above the front chassis. The upper ladder lifting mechanism will drive the upper frame to move downward, and the hanging pins of the upper frame will be disengaged from the hanging hooks downward. The middle ladder will slide downward and be stored in the upper rail of the rear chassis. The lower ladder can be stored upward in the lower rail of the rear chassis. Pull out the connecting pin, and the front and rear chassis are separated.It is convenient for disassembly, assembly and transportation.

[0059] The docking platform 3 of the present invention includes a platform frame 20 and platform sidewalls 21. Platform sidewalls 21 are provided on the left and right sides of the platform frame 20. A platform sidewall connection mechanism 22 is provided on the platform frame 20. The platform sidewall connection mechanism 22 includes platform rollers 23, connection clamping plates 24, compression springs 25, platform guide rails 26, and limit connection plates 27. Platform rollers 23 are provided on the left side of the platform frame 20 from front to back, and platform rollers 23 are provided on the right side of the platform frame 20 from front to back. The platform rollers 23 are installed on a platform shaft through bearings, and the platform shaft is fixed on the platform frame 20. Connection clamping plates 24 are provided on the left and right sides of the platform frame 20. One end of the connection clamping plate 24 is fixedly connected to the platform frame 20 through a compression spring 25, and the other end extends outward and downward to form a clamping block 28. A platform guide rail 26 is provided at the lower end of the platform sidewall 21. The platform guide rail 26 is fixedly connected to the platform sidewall 21. The platform guide rail 26 is matched with the platform rollers 23. The platform sidewall 21 is slidably connected to the platform frame 20 through the platform guide rail 26 and the platform rollers 23, so that the platform sidewall can be installed on the platform frame through the platform guide rail and the platform rollers. A limit connection plate 27 is provided on the platform guide rail 26. One side of the limit connection plate 27 is fixedly connected to the platform sidewall 21, and the other side is provided with limit blocks 29 at intervals from front to back. The clamping block 28 is inserted between adjacent limit blocks 29 to fixedly connect the platform sidewall 21 to the platform frame 20. By stepping on the connection clamping plate and squeezing the spring, the clamping block is lifted, the platform sidewall is slid into the platform frame, the connection clamping plate is released, the spring rebounds, and the clamping block is clamped between adjacent limit blocks to fix the position of the platform sidewall relative to the platform frame.

[0060] On the platform frame 20 of the present invention, there is provided a platform side hull guiding mechanism 30. The platform side hull guiding mechanism 30 includes a side hull column 31, an inner guiding seat 32, an inner roller 33, an outer guiding seat 34, an outer roller 35, and a guiding pin 36. A side hull column 31 is provided inside the platform side hull 21. A guiding rod 37 is provided at the lower end of the side hull column 31. A threaded hole is provided at the lower end of the side hull column 31. A guiding groove is provided on the platform frame 20. The upper end of the guiding rod 37 is fixedly connected to the side hull column 31, and the lower end is inserted into the guiding groove. The side hull column 31 is threadedly connected to the platform frame 20 by screws to facilitate the disassembly and assembly of the side hull column. An inner guiding seat 32 is provided on the side hull column 31. One side of the inner guiding seat 32 is fixedly connected to the side hull column 31, and a connecting slot is provided on the other side. Inner rollers 33 are provided on both the front and rear sides of the connecting slot. A slot pin hole is provided on the connecting slot. The inner rollers 33 are installed on inner roller shafts. The upper and lower ends of the inner roller shafts are fixedly connected to the inner guiding seat 32. An insertion rod 38 and an outer roller 35 are provided on the outer guiding seat 34. The upper end of the insertion rod 38 is fixedly connected to the outer guiding seat 34. The insertion rod 38 is hollow. An insertion rod pin hole is provided on the insertion rod 38. The insertion rod 38 is inserted into the connecting slot. The guiding pin 36 passes through the slot pin hole and the insertion rod pin hole to fixedly connect the insertion rod 38 to the inner guiding seat 32. The outer roller 35 and the inner roller 33 are spaced relatively. One side of the platform side hull 21 abuts against the inner roller 33, and the other side abuts against the outer roller 35. The outer roller 35 is sleeved on an outer roller shaft. The upper and lower ends of the outer roller shaft are fixedly connected to the outer guiding seat 34 to guide the front and rear movement of the platform side hull through the inner and outer rollers.

[0061] A ladder limit connection mechanism 39 is provided between the middle ladder 5 and the lower ladder 6 of the present invention. The ladder limit connection mechanism 39 includes a limit plate 40, a ladder limit fixing seat 41, a baffle 42, a limit spring 43, and a limit handle 44. Limit plates 40 are respectively provided on both sides of the rear part of the lower end of the middle ladder 5. The limit plates 40 are fixedly connected to the middle ladder 5. A limit slot 45 is provided at the lower end of the limit plate 40. The lower ladder 6 includes a first ladder 46 and a second ladder 47. Rollers are respectively installed on both sides of the first ladder 46. The first ladder 46 is slidably connected to the lower track 16 of the rear chassis 8 through the rollers. The rear end of the first ladder 46 is hinged to the front end of the second ladder 47. The upper end of the second ladder 47 is cooperatively docked with the middle ladder 5. Support wheels 19 are installed on both sides of the lower end of the second ladder 47. Ladder limit fixing seats 41 are provided on both sides of the front end of the first ladder 46. The ladder limit fixing seats 41 are fixedly connected to the first ladder 46. A limit perforation is provided on the ladder limit fixing seat 41. A baffle 42 is inserted into the limit perforation. A limit spring 43 is provided in the limit perforation. The baffle 42 includes an upper baffle section 48 and a lower baffle section 49. The upper end of the upper baffle section 48 is inserted into the limit slot 45 to limit and fix the front and rear positions of the first ladder 46 and the middle ladder 5. The lower end of the upper baffle section 48 is fixedly connected to the lower baffle section 49. The outer diameter of the upper baffle section 48 is larger than the outer diameter of the lower baffle section 49. The lower end of the lower baffle section 49 passes through the limit perforation and is provided with a limit handle 44. The lower baffle section 49 is fixedly connected to the limit handle 44. The limit spring 43 is sleeved on the lower baffle section 49. One end of the limit spring 43 abuts against the lower end surface of the upper end of the baffle 42, and the other end abuts against the ladder limit fixing seat 41. The outer diameter of the limit handle 44 is larger than the inner diameter of the limit perforation. When it is necessary to retract the lower ladder, the limit handle is manually pulled downward to compress the limit spring, and the upper end of the upper baffle section is disengaged from the limit slot. Then, the second ladder is lifted, and the second ladder is rotated upward around its hinge point with the first ladder. After rotating to the horizontal position, the second ladder is pushed forward, and the first ladder drives the second ladder to move forward along the lower track to retract the entire lower ladder. When it is necessary to deploy the lower ladder, the second ladder is pulled out backward and then rotated downward. The upper end of the upper baffle section at the front end of the first ladder enters the limit slot to realize automatic limiting of the first ladder and the middle ladder.

[0062] The front end surface of the limit plate 40 of the present invention extends downward and backward to form a guiding surface to facilitate the upper baffle section to automatically slide into the limit slot along the guiding surface.

[0063] On the platform frame 20 of the present invention, there is provided a platform foldable connection mechanism 50. The platform foldable connection mechanism 50 includes a front hinge block 51, a hinge connecting plate 52, a front connection block 53, a rear hinge block 54, a rear connection block 55, and a connection pin 56. The platform frame 20 includes a front platform section 57 and a rear platform section 58. At the rear end of the front platform section 57, there is provided a front hinge block 51. The front end of the front hinge block 51 is fixedly connected to the front platform section 57, and the rear end is provided with a hinge shaft hole. On both sides of the front hinge block 51, there are provided hinge connecting plates 52. At the lower end of the front hinge block 51, there is provided a front connection block 53. The front connection block 53 is fixedly connected to the front hinge block 51. The rear end of the front connection block 53 extends backward and is provided with a front connection pin hole. At the front end of the rear platform section 58, there is provided a rear hinge block 54. The front end of the rear hinge block 54 is provided with a hinge shaft hole, and the rear end is fixedly connected to the rear platform section 58. At the lower end of the rear hinge block 54, there is provided a rear connection block 55. The rear connection block 55 is fixedly connected to the rear hinge block 54. The front end of the rear connection block 55 extends forward and is provided with a rear connection pin hole. The front end of the hinge connecting plate 52 is hinged to the front hinge block 51 via a front hinge shaft, and the rear end is hinged to the rear hinge block 54 via a rear hinge shaft. The rear end of the front connection block 53 and the front end of the rear connection block 55 face each other. The front connection block 53 and the rear connection block 55 are fixedly connected via the connection pin 56, the front connection pin hole, and the rear connection pin hole. It is beneficial to pull out the connection pin, and the front platform section can be flipped relative to the rear platform section around the front hinge shaft and folded with the rear platform section.

[0064] Between the front platform section 57 and the rear platform section 58 of the present invention, there is provided a flip pedal 59. The front end face of the flip pedal 59 abuts against the rear end face of the front platform section 57, and the rear end face abuts against the front end face of the rear platform section 58. The rear end of the flip pedal 59 is hinged to the rear platform section 58. On the lower end face of the flip pedal 59, there is provided a flip connection block 60. The flip connection block 60 is fixedly connected to the flip pedal 59. The flip connection block 60 is provided with a flip pin hole. On the rear end face of the front platform section 57, there is provided a flip connection pin hole. A flip pin 61 passes through the flip pin hole and the flip connection pin hole to fixedly connect the flip connection block 60 to the front platform section 57, thereby fixing the flip pedal between the front platform section and the rear platform section. When the front platform section and the rear platform section need to be folded in half, pull out the flip pin, flip the flip pedal backward, and it lands on the rear platform section. Subsequently, flip the front platform section backward and it lands on the rear platform section.

[0065] A platform folding limit mechanism 62 is provided between the front section 57 and the rear section 58 of the platform according to the present invention. The platform folding limit mechanism 62 includes a platform limit shaft 63, a platform limit hook 64, a hook pin shaft 65 and a torsion spring 66. The platform limit shaft 63 is provided on at least one side of the front section 57 of the platform, and the platform limit shaft 63 is fixedly connected to the front section 57 of the platform. The platform limit hook 64 is provided on at least one side of the rear section 58 of the platform. The platform limit hook 64 is hinged to the rear section 58 of the platform through the hook pin shaft 65. The torsion spring 66 is sleeved on the hook pin shaft 65. The platform limit hook 64 is limit-connected to the rear section 58 of the platform through the torsion spring 66, so that the hook end of the platform limit hook has a tendency to rotate backward through the torsion spring. When the front section 57 and the rear section 58 of the platform are folded, the platform limit hook 64 hooks the platform limit shaft 63 to limit-connect the front section 57 and the rear section 58 of the platform.

[0066] The ladder side hulls 67 are provided on both sides of the upper ladder 4 according to the present invention. The ladder side hulls 67 are provided on both sides of the middle ladder 5. The ladder side hulls 67 are provided on both sides of the second ladder 47. A ladder side hull quick connection mechanism 68 is provided at the lower end of the ladder side hull 67. The ladder side hull quick connection mechanism 68 includes a side hull connection frame 69, a locking screw 70 and a plug-in column 71. The side hull connection frames 69 are fixedly provided on both sides of the upper ladder 4. The side hull connection frames 69 are fixedly provided on both sides of the middle ladder 5. The side hull connection frames 69 are fixedly provided on both sides of the second ladder 47. A side hull card slot 72 is provided at the upper end of the side hull connection frame 69. Plug-in holes 73 are provided at intervals on the side hull connection frame 69. A locking hole is provided on the side of the plug-in hole 73, and the locking hole communicates with the plug-in hole 73. The locking screw 70 is provided in the locking hole. The plug-in columns 71 are provided at intervals at the lower end of the ladder side hull 67. The upper end of the plug-in column 71 is fixedly connected to the ladder side hull 67. The outer diameter of the upper end of the plug-in column 71 matches the inner diameter of the plug-in hole 73. The outer diameter of the upper part of the plug-in column 71 is larger than the outer diameter of the lower part of the plug-in column 71. The lower end of the ladder side hull 67 is snapped into the side hull card slot 72, the plug-in column 71 is inserted into the plug-in hole 73, the locking screw 70 passes through the locking hole and abuts against the plug-in column 71, and the locking screw 70 is threadedly connected to the side hull connection frame 69 to fixedly connect the ladder side hull 67 and the side hull connection frame 69, so that by rotating the locking screw, the locking screw abuts against the plug-in column to fix the ladder side hull and the side hull connection frame. Unscrew the locking screw and pull out the ladder side hull, and the plug-in column is separated from the plug-in hole to separate the ladder side hull and the side hull connection frame.

[0067] The trapezoid lifting mechanism 9 of the present invention includes a simply supported beam group 74 and a lifting drive cylinder 75. The simply supported beam group 74 is symmetrically arranged on both sides of the front chassis 7. The simply supported beam group 74 includes an outer lower simply supported beam 76, an inner lower simply supported beam 77, an outer upper simply supported beam 78, and an inner upper simply supported beam 79. Lifting guide rails are fixedly arranged on both sides of the frame of the front chassis 7. The outer lower simply supported beams 76 are arranged on both sides of the front part of the frame of the front chassis 7, and the inner lower simply supported beams 77 are arranged on both sides of the rear part of the frame of the front chassis 7. A roller is installed at the lower end of the outer lower simply supported beam 76. The outer lower simply supported beam 76 is slidably connected to the frame of the front chassis 7 through the roller and the lifting guide rail. The middle part of the outer lower simply supported beam 76 is hinged to the inner lower simply supported beam 77 on the same side. The outer upper simply supported beam 78 is arranged at the upper end of the outer lower simply supported beam 76. The lower end of the inner lower simply supported beam 77 is hinged to the frame of the front chassis 7, and the inner upper simply supported beam 79 is arranged at the upper end. The lower end of the outer upper simply supported beam 78 is hinged to the outer lower simply supported beam 76. The middle part of the outer upper simply supported beam 78 is hinged to the inner upper simply supported beam 79 on the same side. A roller is arranged at the upper end of the outer upper simply supported beam 78. The lower end of the inner upper simply supported beam 79 is hinged to the inner lower simply supported beam 77, and the upper end is hinged to the upper frame 10. Frame guide rails are fixedly arranged on both sides of the upper frame 10. The outer upper simply supported beam 78 is slidably connected to the upper frame 10 through the roller and the frame guide rail. A connecting beam 80 is connected between the two outer lower simply supported beams 76 on both sides of the front chassis 7, a connecting beam 80 is connected between the two inner lower simply supported beams 77, a connecting beam 80 is connected between the two outer upper simply supported beams 78, and a connecting beam 80 is connected between the two inner upper simply supported beams 79 to realize the synchronous lifting of the two groups of simply supported beam groups. A lifting drive cylinder 75 is arranged between the inner upper simply supported beam 79 and the inner lower simply supported beam 77. One end of the lifting drive cylinder 75 is hinged to the inner upper simply supported beam 79, and the other end is hinged to the inner lower simply supported beam 77 to facilitate the lifting of the simply supported beam group by driving the lifting drive cylinder.

[0068] A retractable support mechanism 81 is provided between the front chassis 7 and the upper frame 10 of the present invention. The retractable support mechanism 81 includes a front retractable rod 82, a rear retractable rod 83, a front guiding and limiting roller 84, a front locking pin 85, a front clamping plate 86, a rear guiding and limiting roller 87, a rear locking pin, a rear clamping plate 89, a plugging rod 88 and a positioning pin 90. Front retractable rods 82 are respectively provided on both sides of the front end of the upper frame 10, and rear retractable rods 83 are respectively provided on both sides of the rear end of the upper frame 10. Front guiding and limiting rollers 84 are provided on the inner upper simply supported beam 79 on the same side of the front retractable rod 82. The front retractable rod 82 includes a front upper support rod 91 and a front lower support rod 92. The upper end of the front upper support rod 91 is hinged to the upper frame 10, and the lower end is inserted into the front lower support rod 92. The front upper support rod 91 is slidably connected to the front lower support rod 92. A front upper pin hole is provided at the lower part of the front upper support rod 91, a front lower pin hole is provided at the upper part of the front lower support rod 92, and a connecting groove is provided at the lower end of the front lower support rod 92. The front upper support rod 91 is fixedly connected to the front lower support rod 92 through the front locking pin 85, the front upper pin hole and the front lower pin hole. After the front upper support rod rises with the upper frame and is pulled out of the front lower support rod in place, the positions of the front upper support rod and the front lower support rod are fixed by the front locking pin. A front clamping plate 86 is provided on the side wall of the front lower support rod 92. The front clamping plate 86 is fixedly connected to the front lower support rod 92. A clamping slot is provided on the front clamping plate 86. The front guiding and limiting roller 84 is placed in the clamping slot of the front clamping plate 86, and the front guiding and limiting roller 84 abuts against the front clamping plate 86 to limit the front lower support rod 92 on the inner upper simply supported beam 79. Rear guiding and limiting rollers 87 are provided on the outer lower simply supported beam 76 on the same side of the rear retractable rod 83. The rear retractable rod 83 includes a rear upper support rod 93 and a rear lower support rod 94. The upper end of the rear upper support rod 93 is hinged to the upper frame 10, and the lower end is inserted into the rear lower support rod 94. The rear upper support rod 93 is slidably connected to the rear lower support rod 94. A rear upper pin hole is provided at the lower part of the rear upper support rod 93, a rear lower pin hole is provided at the upper part of the rear lower support rod 94, and a connecting groove is provided at the lower end of the rear lower support rod 94. The rear upper support rod 93 is fixedly connected to the rear lower support rod 94 through the rear locking pin, the rear upper pin hole and the rear lower pin hole. After the rear upper support rod rises with the upper frame and is pulled out of the rear lower support rod in place, the positions of the rear upper support rod and the rear lower support rod are fixed by the rear locking pin. A rear clamping plate 89 is provided on the side wall of the rear lower support rod 94. The rear clamping plate 89 is fixedly connected to the rear lower support rod 94. A clamping slot is provided on the rear clamping plate 89. The rear guiding and limiting roller 87 is placed in the clamping slot of the rear clamping plate 89, and the rear guiding and limiting roller 87 abuts against the rear clamping plate 89 to limit the rear lower support rod 94 on the outer lower simply supported beam 76. A connecting pin hole is provided on the connecting groove. Plugging rods 88 are respectively provided on both sides of the front end and both sides of the rear end of the vehicle frame of the front chassis 7. The lower ends of the plugging rods 88 are fixedly connected to the vehicle frame of the front chassis 7. A positioning pin hole is provided on the plugging rod 88. The plugging rod 88 is inserted into the connecting groove.The positioning pin 90 passes through the connecting pin shaft hole and the positioning pin hole to fixedly connect the front lower support rod or the rear lower support rod with the insertion rod 88. After the ladder body lifting mechanism raises the upper frame, the front lower support rod is removed from the front guiding limit roller, and the lower end of the front lower support rod is inserted on the insertion rod 88. The front lower support rod and the front upper support rod are locked by the front locking pin, so that the front upper support rod and the front lower support rod support the upper frame. Similarly, the rear upper support rod and the rear lower support rod support the upper frame.

[0069] The hinge point of the front upper support rod 91 of the present invention and the upper frame 10 is higher than the hinge point of the rear upper support rod 93 and the upper frame 10, so that when folding, the front retractable rod is placed at the upper end of the rear retractable rod.

[0070] The ladder body lifting mechanism 9 of the present invention is provided with a frame automatic height measuring mechanism 95. The frame automatic height measuring mechanism 95 includes an induction frame 96, an induction plate 97, and an inductor 98. An induction frame 96 is provided between the inner upper simply supported beam 79 and the inner lower simply supported beam 77. The induction frame 96 is provided with an induction groove. The upper end of the induction plate 97 is hinged to the inner upper simply supported beam 79, and the induction plate 97 is placed in the induction groove and slidably connected to the induction frame 96. The induction plate 97 is provided with induction holes 99 at intervals along the sliding direction of the induction plate 97. The upper end of the induction groove is provided with an inductor 98, and the lower end is hinged to the inner lower simply supported beam 77. The inductor 98 is fixedly connected to the induction frame 96, and the inductor 98 cooperates with the induction holes 99 for induction, so as to read the length of the induction plate extending out by the inductor sensing the number of induction holes.

[0071] An upper ladder automatic height measuring mechanism 100 is provided between the upper frame 10 and the upper ladder 4 of the present invention. The upper ladder automatic height measuring mechanism 100 includes an induction frame, an induction plate, and an inductor. The upper frame is provided with an induction frame. The induction frame is provided with an induction groove, and an induction plate is arranged in the induction groove. The lower end of the induction frame is hinged to the upper frame, and the induction plate is slidably connected to the induction frame. The upper end of the induction plate is hinged to the upper ladder. The induction plate is provided with induction holes at intervals along the sliding direction of the induction plate. The upper end of the induction groove is provided with an inductor. The inductor is fixedly connected to the induction frame, and the inductor cooperates with the induction holes for induction, so as to read the length of the induction plate extending out by the inductor sensing the number of induction holes.

[0072] On the upper ladder adjusting drive cylinder 12 of the present invention, there is a support locking mechanism 101. The support locking mechanism 101 includes a tooth 102, a pawl drive cylinder 103 and a pawl 104. A tooth 102 is fixedly provided on the rod wall of the telescopic rod of the upper ladder adjusting drive cylinder 12. A pawl drive cylinder 103 is provided on the cylinder base of the upper ladder adjusting drive cylinder 12. A pawl 104 is fixedly connected to the telescopic rod of the pawl drive cylinder 103. The pawl 104 cooperates with the tooth 102 to lock the position of the telescopic rod of the upper ladder adjusting drive cylinder 12, so as to prevent the telescopic rod of the upper ladder adjusting drive cylinder from sliding when the upper ladder is supported.

[0073] On the pawl drive cylinder 103 of the present invention, there is a pawl clamping mechanism 105. The pawl clamping mechanism 105 includes a clamping adjustment plate 106, a first pin shaft 107, a second pin shaft 108, a clamping spring 109, a pawl shaft connecting plate 110 and a pawl shaft 111. A clamping adjustment plate 106 is provided on the telescopic rod of the pawl drive cylinder 103. One end of the clamping adjustment plate 106 is provided with a first pin shaft 107, and the other end is provided with a second pin shaft 108. Clamping springs 109 are provided on both sides of the clamping adjustment plate 106. One end of the clamping adjustment plate 106 is provided with a shaft hole, and the other end is provided with a long slot 112. The clamping adjustment plate 106 is hinged to the telescopic rod of the pawl drive cylinder 103 through the first pin shaft 107. The second pin shaft 108 passes through the long slot 112. Pawl shaft connecting plates 110 are provided at both ends of the second pin shaft 108. One end of the pawl shaft connecting plate 110 is fixedly connected to the second pin shaft 108, and the other end is fixedly connected to the pawl shaft 111. The pawl 104 is fixedly arranged on the pawl shaft 111. One end of the clamping spring 109 is connected to the first pin shaft 107, and the other end is connected to the second pin shaft 108, which is beneficial to the telescopic rod of the pawl drive cylinder to extend. The front end of the clamping adjustment plate drives the pawl shaft to rotate, the pawl shaft drives the pawl to engage with the tooth, the clamping spring is compressed, and there is a long slot at the front end of the clamping adjustment plate, so that after the clamping spring is compressed, it drives the second pin shaft to rotate towards the tooth, prompting the pawl to be in close contact with the tooth.

[0074] Between the two ends of the platform support rod 13 of the present invention, there is a retracting pin hole, which is convenient for turning the docking platform downward and storing it in front of the front chassis after removing the offline support pin. At this time, the support pin can be inserted into the retracting pin hole and the platform pin hole to fix the docking platform to the upper ladder, thus avoiding the shaking of the docking platform during transportation.

[0075] As shown in the attached Figure 1 - attached Figure 27, the front end of the front chassis 7 can be moved by being towed by a tractor or manually dragged, which can be set according to requirements. A control system can be set on the chassis 1. The control system such as a PLC control system, the upper ladder adjusting drive cylinder 12, the lifting drive cylinder 75, the sensor 98, the sensor of the automatic height measuring mechanism 100 of the upper ladder 4, the support locking mechanism 101, and the pawl drive cylinder 103 are all connected to the control system. A display screen or a control switch can also be set, and the display screen or the control switch is connected to the control system. The control buttons of the above-mentioned drive cylinders or sensors are provided on the display screen or the control switch. When in use, the display screen or the control switch can be manually picked up for convenient manual control by the operator. When not in use, the display screen or the control switch can be placed on the chassis 1. The present invention has two states. One is as shown in the attached Figure 1 - attached Figure 4 during the use state, and the other is as shown in the attached Figure 5 and the attached Figure 6 in the folded state when not in use. The following specifically describes the conversion method between the two states: As shown in the attached Figure 1 - attached Figure 4 is the use state of the present invention. When in use, the driving docking platform 3 is docked with the aircraft. When the present invention is used up and needs to be retracted: The first step: Remove the platform side rail 21: Taking the platform side rail 21 on one side of the platform frame 20 as an example, first remove the platform side rail guiding mechanism 30, as shown in the attached Figures 13 - 15 , pull out the guiding pin 36, remove the outer guiding seat 34, then remove the screw at the lower end of the side rail column 31, and remove the side rail column 31 from the platform frame 20. Secondly, as shown in the attached Figure 11 - attached Figure 12 , the operator steps on the connecting clamping plate 24 so that the clamping block 28 disengages from the limiting block 29, and then the operator manually pulls out the platform side rail 21 forward. Similarly, remove the platform side rail 21 on the other side of the platform frame 20; The second step: Remove the ladder side rail 67: As shown in the attached Figure 1 - attached Figure 4 , attached Figure 24 and attached Figure 25 , taking the ladder side rail 67 on one side of the upper ladder 4 as an example, sequentially loosen the locking screws 70 so that the locking screws 70 are separated from the plugging columns 71, and then manually pull out the ladder side rail 67 of the upper ladder 4 upward. Similarly, remove the ladder side rails 67 on the other side of the upper ladder 4, the ladder side rails 67 on both sides of the middle ladder 5, and the ladder side rails 67 on both sides of the second ladder 47; The third step: Retract the retractable support mechanism 81: As shown in the attached Figure 16 - attached Figure 19, pull out the positioning pin 90 connecting the lower ends of the front retractable rod 82 and the rear retractable rod 83 in the retractable support mechanism 81 to the front chassis 7, then respectively pull out the front locking pin 85 on the front retractable rod 82 and the rear locking pin 88 on the rear retractable rod 83, then retract the front lower support rod 92 of the front retractable rod 82 upward, rotate the front lower support rod 92 backward so that the front clamping plate 86 of the front lower support rod 92 is clamped on the front guiding limit roller 84, then retract the rear lower support rod 94 of the rear retractable rod 83 upward, rotate the rear lower support rod 94 forward so that the rear clamping plate 89 of the rear lower support rod 94 is clamped on the rear guiding limit roller 87. In the present invention, two front retractable rods 82 and two rear retractable rods 83 are provided on the front chassis 7, and place the front retractable rod 82 and the rear retractable rod 83 according to the above steps; Fourth step: Retract the upper ladder 4: Start the lifting drive cylinder 75, as shown in the appendix Figure 16 , in this embodiment, two sets of simple support beam groups 74 are provided on the front chassis 7, and correspondingly two lifting drive cylinders 75 are also provided, corresponding one by one to the simple support beam groups 74. The upper ladder 4 and the docking platform 3 move downward with the upper frame 10, and the boarding ladder moves downward with the upper frame 10. As the upper frame 10 falls, the distance between the hinge point of the upper end of the front retractable rod 82 and the upper frame 10 and the front guiding limit roller 84 becomes smaller and smaller, the front retractable rod 82 gradually contracts, and the front upper support rod 91 gradually enters the front lower support rod 92. The front retractable rod 82 swings backward until the front retractable rod 82 is in a horizontal state. Similarly, the distance between the rear retractable rod 83 and the rear guiding limit roller 87 also becomes smaller and smaller, the rear retractable rod 83 swings forward and gradually becomes horizontal, the rear retractable rod 83 contracts, and the rear upper support rod 93 gradually enters the rear lower support rod 94. Because the hinge point of the rear retractable rod 83 and the upper frame 10 is lower than the hinge point of the front retractable rod 83 and the upper frame 10, and the rear retractable rod 83 is located at the lower end of the front retractable rod 82, the simple support beam group 74 descends to the lowest point, as shown in the appendix Figure 17 Realize the automatic retraction of the front retractable rod 82 and the rear retractable rod 83, close the lifting drive cylinder 75, as shown in the appendix Figure 4 and the appendix Figure 28 , during the downward movement of the upper frame 10, the upper frame 10 drives the hanging pin shaft 11 thereon to fall, and the hanging pin shaft 11 disengages from the hanging hook 18, so that the upper ladder 4 is separated from the middle ladder 5; Fifth step: Separate the front chassis 7 and the rear chassis 8; Pull out the connecting pin shaft between the front connecting seat 15 of the front chassis 7 and the rear connecting seat 14 of the rear chassis 8, separate the front connecting seat 15 and the rear connecting seat 14, and realize the separation of the front chassis 7 and the rear chassis 8; Sixth step: Release the braking of the upper ladder adjustment drive cylinder 12: Start the pawl drive cylinder 103 of the support locking mechanism 101, the telescopic cylinder of the pawl drive cylinder 103 retracts, so that the pawl 104 is separated from the tooth 102, release the locking of the upper ladder adjustment drive cylinder 12, start the upper ladder adjustment drive cylinder 12, and the telescopic rod of the upper ladder adjustment drive cylinder 12 retracts, and the front end of the upper ladder 4 drives the docking platform 3 to fall, as shown in the appendix Figure 5, close the upper ladder adjustment drive cylinder 12; Step 7: Fold the platform frame 20: As shown in the appendix Figures 7 - 9 , pull out the turning pin 61 at the lower end of the turning pedal 59, turn the turning pedal 59 backward so that the turning pedal 59 falls on the rear section 58 of the platform, pull out the connecting pins 56 on the left and right sides of the platform frame 20, and turn the front section 57 of the platform backward so that the rear section 58 of the platform falls on the turning pedal 59 and the rear section 58 of the platform, as shown in the appendix Figure 10 , pull the hook end at the upper end of the platform limit hook 64 backward so that the hook end of the platform limit hook 64 hooks the platform limit shaft 63 to positionally limit and fix the front section 57 and the rear section 58 of the platform; Step 8: Bend the platform frame 20 downward and retract and fix it: Pull out the support pin shaft connecting the front end of the platform support rod 13 and the docking platform 3. At this time, the platform frame 20 can rotate around its hinge point with the upper ladder 4. Align the retraction pin shaft hole of the platform support rod 13 with the platform pin shaft hole, and insert the support pin shaft into the retraction pin shaft hole and the platform pin shaft hole to positionally limit and fix the platform frame 20 and the upper ladder 4, as shown in the appendix Figure 5 shown to prevent the docking platform 3 from shaking during movement or transportation; Step 9: Retract the middle ladder 5 and the lower ladder 6: After the upper frame 10 drops, the operator manually holds the middle ladder 5 and releases the brakes on the limit plates 40 on both sides of the middle ladder 5. Manually pull down the limit pull handle 44 to drive the baffle 42 to move downward. The baffle 42 compresses the limit spring 43 downward, and the upper end of the baffle 42 disengages from the limit slot 45 of the limit plate 40. The lower ladder 6 includes a first ladder 46 and a second ladder 47. The operator lifts the second ladder 47 upward, and the second ladder 47 rotates upward around the hinge point between the second ladder 47 and the first ladder 46 until the second ladder 47 is in a horizontal state. Push the second ladder 47 forward, and the second ladder 47 pushes the first ladder 46 forward. The first ladder 46 rolls forward on the lower track of the rear chassis 8 through the rollers, so that the first ladder 46 and the second ladder 47 fall on the rear chassis 8. Then the operator lowers the front part of the middle ladder 5. The rear end of the middle ladder 5 is equipped with rollers that can rotate. The front end of the middle ladder 5 rotates downward around the rollers until the middle ladder 5 is in a horizontal state. Push the middle ladder 5 backward, and the rollers are slidably connected to the upper track 17 so that the middle ladder 5 falls above the lower ladder 6, as shown in the appendix Figure 6 , completing the storage of the middle ladder 5 and the lower ladder 6; In the present invention, after the hanging pin 11 and the hanging hook 18 are separated in the fourth step or after the front chassis 7 and the rear chassis 8 are separated in the fifth step, if there are more operators, the sixth step and the ninth step can be carried out simultaneously. The above steps can be adjusted according to the number of operators and the actual situation on site, as long as the front and rear chassis 8 can be disassembled and folded properly.

[0076] When in use, that is, transform the present invention from the folded state shown in the appendix Figure 5 and the appendix Figure 6 to the state shown in the attached drawing - the attached drawing Figure 4The steps for using the unfolded state are as follows: First step: Rotate the platform frame 20 to the horizontal state: Pull out the support pin shaft at the front end of the platform support rod 13 from the retracted pin shaft hole and the platform pin shaft hole. The platform frame 20 can rotate upward and forward around the hinge point between it and the upper ladder 4. Rotate the platform frame 20 to the horizontal position so that the support pin shaft hole at the front end of the platform support rod 13 corresponds to the platform pin shaft hole. Pass the support pin shaft through the support pin shaft hole and the platform pin shaft hole to horizontally fix the platform frame 20 at the front end of the upper ladder 4. Second step: Unfold the platform frame 20. As shown in Figure 10 , pull the hook end of the platform limit hook 64 backward so that the hook end of the platform limit hook 64 is away from the platform limit shaft 63. The front section 57 of the platform rotates upward and forward until the front section 57 of the platform is in a horizontal state. As shown in Figure 9 , insert the connecting pin 56. Rotate the flip pedal 59 upward and forward until the front section of the flip pedal 59 abuts against the front section 57 of the platform, and insert the flip pin 61. Third step: Install the platform side hull 21: Taking the installation of the side hull on one side of the platform frame 20 as an example, first install the platform side hull guiding mechanism 30. As shown in Figures 13 - 15 , correspondingly insert the guiding rod at the lower end of the side hull column 31 into the guiding groove of the platform frame 20, fix the side hull column 31 on the platform frame 20 with screws, fix the inner guiding seat 32 on the side hull column 31 with screws. Insert the inserting rod 38 of the outer guiding seat 34 into the connecting slot of the inner guiding seat 32, and insert the guiding pin 36 to fix the inner guiding seat 32 and the outer guiding seat 34. As shown in Figure 11 and Figure 12 , press the connecting clamping plate 24 so that the block 28 is lifted. Push the platform side hull 21 from front to back. The platform guide rail 26 of the platform side hull 21 is sleeved on the platform roller 23. The upper end of the platform side hull 21 passes through the guiding space between the inner roller 33 and the outer roller 35 until the platform side hull 21 moves into place. As shown in Figures 1 - 4 , Figure 7As shown, stop pressing the connecting clamping plate 24 so that the clamping block 28 is clamped between adjacent limiting blocks 29, and fixedly connect the platform side hull 21 and the platform frame 20. Similarly, install the side hull on the other side of the platform frame 20; Fourth step: Connect the front chassis 7 and the rear chassis 8: Move the rear chassis 8 to the rear side of the front chassis 7 so that the front connecting seat 15 and the rear connecting seat 14 face each other, insert the connecting pin shaft, and limit-connect the front connecting seat 15 and the rear connecting seat 14 to realize the connection between the front chassis 7 and the rear chassis 8; Fifth step: Raise the ladder body: Start the lifting drive cylinder 75, and the simply supported beam group 74 rises accordingly, driving the upper frame 10, the upper ladder 4 on the upper frame 10, and the docking platform 3 to rise. As the upper frame 10 rises, the distance between the hinge point of the upper end of the front retractable rod 82 and the upper frame 10 and the front guiding and limiting roller 84 becomes larger and larger, and the front retractable rod 82 gradually extends. The front upper support rod 91 extends out of the front lower support rod 92. The front retractable rod 82 swings forward until the front retractable rod 82 is in a nearly vertical state. Similarly, the distance between the rear retractable rod 83 and the rear guiding and limiting roller 87 also becomes larger and larger, and the rear retractable rod 83 swings backward and gradually becomes in a nearly vertical state. The rear retractable rod 83 extends, and the rear upper support rod 93 extends out of the rear lower support rod 94. Close the lifting drive cylinder 75, manually remove the front retractable rod 82 from the front guiding and limiting roller 84, pull down the front lower support rod 92 so that the lower end of the front lower support rod 92 is clamped on the insertion rod 88 on one side of the front end of the front chassis 7, insert the positioning pin 90, and at the same time, lock and fix between the front lower support rod 92 and the front upper support rod 91 through the front locking pin 85. Manually remove the rear retractable rod 83 from the rear guiding and limiting roller 87, pull down the rear lower support rod 94 so that the lower end of the rear lower support rod 94 is clamped on the insertion rod 88 on one side of the rear end of the front chassis 7, insert the positioning pin 90, and at the same time, lock and fix between the rear lower support rod 93 and the rear lower support rod 94 through the rear locking pin. Similarly, put down the front retractable rod 82 and the rear retractable rod 83 on the other side of the front chassis 7 and fix them to the front chassis 7. While the upper frame 10 rises, the hanging pin shaft 11 contacts the hanging hook 18 of the middle ladder 5, and the hanging hook 18 is hung on the hanging pin shaft 11. The front end of the middle ladder 5 rises with the upper frame 10, and the front end of the middle ladder 5 rotates upward by rotating through the roller at the rear end of the middle ladder 5 in the lower track 16. Start the upper ladder adjustment drive cylinder 12, lift the front ends of the docking platform 3 and the upper ladder 4. After the docking platform 3 rises in place, close the upper ladder adjustment drive cylinder 12; Sixth step: Locking of the upper ladder adjustment drive cylinder 12: Start the pawl drive cylinder 103, and the telescopic rod of the pawl drive cylinder 103 extends out so that the pawl contacts the tooth 102 to fix the position of the telescopic rod of the upper ladder adjustment drive cylinder 12;Step 7: Deployment of the second ladder 47: Manually pull the second ladder 47 backward. The second ladder 47 drives the first ladder 46 to move horizontally backward. Then rotate the second ladder 47 downward. The second ladder 47 rotates downward around its hinge point with the first ladder 46 until the support wheel at the rear end of the second ladder 47 touches the ground. At this time, the baffle 42 of the ladder limit connection mechanism 39 at the front end of the first ladder 46 automatically slides into the limit slot 45 of the limit plate 40, limiting and fixing the positions of the first ladder 46 and the second ladder 47. Step 8: Installation of the ladder side rail 67: Taking the installation of the ladder side rail 67 on one side of the upper ladder 4 as an example, as shown in the appendix; Figure 24 and the appendix Figure 25 , insert the ladder side rail 67 into the side rail slot 72 of the side rail connection frame 69. Insert the insertion post 71 at the lower end of the ladder side rail 67 into the insertion hole. Rotate the locking screw 70 so that the front end of the locking screw 70 abuts against the insertion post 71, fixedly connecting the ladder side rail 67 and the side rail connection frame 69. Similarly, install the ladder side rails 67 on the other side of the upper ladder 4, both sides of the middle ladder 5, and both sides of the second ladder 47. Step 9: Tires are provided at the lower ends of the front chassis 7 and the rear chassis 8. The present invention can be manually towed or towed by a tractor to pick up the plane.

[0077] The present invention has an ingenious structure. When not in use, it can be split into two parts. Both parts can be folded, occupying a small space, convenient for transportation and dragging, and having low transportation cost. Moreover, if one part has a problem, only this part can be replaced, having low use cost. Moreover, the present invention is detachable, foldable, and very convenient for maintenance. In the present invention, the lower end of the upper ladder 4 is matched and docked with the upper end of the middle ladder 5, and the lower end of the middle ladder 5 is matched and docked with the upper end of the second ladder 47 to form the entire ladder body. The ladder stools on the upper ladder 4, the middle ladder 5, and the second ladder 47 are continuous ladder stools from top to bottom, and passengers do not need to adjust their steps when going up and down. In order to further improve the docking height of the boarding ladder, the upper track 17 and the lower track 16 in the present invention can adopt variable height tracks. The upper track 17 is from front to back from high to low, and the lower track is from front to back from low to high. The rollers on both sides of the middle ladder 5 are located on the outside of the ladder body of the middle ladder, and the rollers on both sides of the first ladder 46 are located on the outside of the ladder body of the first ladder. When the middle ladder 5 rises, from back to front, along with the upper track, the height of the middle ladder 5 gradually increases, and the second ladder moves up along with the first ladder When the middle ladder 5 and the lower ladder 6 are folded up, the ladder bodies of the first ladder 46 and the second ladder 47 fall on the frame of the rear chassis, and the middle ladder 5 slides backward. The height of the ladder body of the middle ladder 5 becomes lower as the roller moves to the rear side of the lower track 17, and the middle ladder 5 falls on the first ladder 46 and the second ladder 47. The present invention sets a limit between the middle ladder 5 and the lower ladder 6 to prevent the lower ladder 6 from shaking. Or movement problem, high safety; the platform side 21 of the present invention is easy to disassemble and replace. Once a problem occurs, the side can be directly replaced without affecting the pick-up operation. Similarly, the ladder side 67 of the present invention can also be disassembled and assembled, and the installation is quick and convenient. In addition, the present invention provides a retractable support mechanism 81 between the front chassis 7 and the upper frame 10. After the upper ladder 4 is raised, the upper frame 10, the upper ladder 4, and the docking platform 3 are supported by the front retractable rod 82 and the rear retractable rod 83. The support is stable and the safety is high.

[0078] Due to the adoption of the structure, the present invention has the advantages that the boarding ladder can be disassembled when not in use, occupies a small space, is convenient to transport and drag, has a stable and limited structure, can be disassembled on the side, and can be installed quickly and conveniently.

Claims

1. A boarding device, comprising a chassis and a ladder body, characterized in that: The chassis includes a front chassis and a rear chassis, the front chassis and the rear chassis are detachably connected, the ladder body includes a front ladder body and a rear ladder body, a front ladder body lifting support mechanism is provided between the front ladder body and the front chassis, the front ladder body is driven by the front ladder body lifting support mechanism, the front end of the rear ladder body is detachably connected to the front ladder body lifting support mechanism, the rear ladder body is driven by the front ladder body lifting support mechanism, the rear ladder body and the front ladder body cooperate to form the whole ladder body, and the rear ladder body is movably connected to the rear chassis.

2. The boarding device according to claim 1, characterized in that: The front ladder body includes an upper ladder, and the front ladder body lifting support mechanism includes a ladder body lifting mechanism, an upper frame and an upper ladder adjustment driving cylinder. The lower end of the ladder body lifting mechanism is connected to the front chassis, and the upper end is connected to the upper frame. The upper ladder is provided on the upper frame. Hanging pins are provided on the left and right sides of the rear end of the upper frame, and both ends of the hanging pins are connected to the upper frame. An upper ladder adjustment driving cylinder is provided between the upper ladder and the upper frame. The lower end of the upper ladder is hinged to the upper frame, and the front part of the upper ladder is connected to the upper frame through the upper ladder adjustment driving cylinder. Hanging hooks are provided on both sides of the upper end of the rear ladder body, and the upper ends of the hanging hooks are cooperatively and hangingly connected with the hanging pins, and the lower ends of the hanging hooks are fixedly connected to the rear ladder body.

3. The boarding device according to claim 2, characterized in that: The rear ladder body includes an intermediate ladder and a lower ladder. Lower rails are provided at both ends of the rear chassis. The lower rails are located at the upper end of the rear chassis and are fixedly connected to the rear chassis. Upper rails are provided on the lower rails and are fixedly connected to the rear chassis. Hanging hooks are fixedly provided on both sides of the upper end of the intermediate ladder, and rollers are installed on both sides of the lower end of the intermediate ladder. The lower end of the intermediate ladder is movably connected to the upper rail of the rear chassis through the rollers. Rollers are installed on both sides of the upper end of the lower ladder, and the upper end of the lower ladder is movably connected to the lower rail of the rear chassis through the rollers.

4. A boarding device according to claim 1 or 2 or 3, characterized in that: A rear connection seat is fixedly provided at the front end of the rear chassis, and a front connection seat is fixedly provided at the rear end of the front chassis. Pin holes are respectively provided on the rear connection seat and the front connection seat, and a connecting pin shaft is passed through the pin holes. The rear chassis is fixedly connected to the front chassis through the connecting pin shaft and the pin holes.

5. A boarding device according to claim 2 or 3, characterized in that: A docking platform is provided at the front end of the upper ladder. The front end of the upper ladder is hinged to the rear end of the docking platform. A platform support rod is provided between the upper ladder and the docking platform. A support pin hole is provided at the front end of the platform support rod, and a platform pin hole is provided at the lower end of the docking platform. The front end of the platform support rod is hinged to the docking platform through the support pin, the support pin hole and the platform pin hole, and the rear end is hinged to the upper ladder.

6. The boarding device according to claim 5, characterized in that: The docking platform includes a platform frame and platform side rails. Platform side rails are provided on the left and right sides of the platform frame, and a platform side rail connection mechanism is provided between the platform side rails and the platform frame.

7. The boarding device according to claim 6, characterized in that: The platform side connection mechanism includes platform rollers, connecting clamping plates, compression springs, platform guide rails, and limit connecting plates. Platform rollers are provided on the left side of the platform frame from front to back, and platform rollers are provided on the right side of the platform frame from front to back. The platform rollers are installed on the platform shaft through bearings, and the platform shaft is fixed on the platform frame. Connecting clamping plates are provided on the left and right sides of the platform frame. One end of the connecting clamping plate is fixedly connected to the platform frame through a compression spring, and the other end extends outward and downward to form a clamping block. A platform guide rail is provided at the lower end of the platform side, and the platform guide rail is fixedly connected to the platform side. The platform guide rail is matched with the platform rollers, and the platform side is slidably connected to the platform frame through the platform guide rail and the platform rollers. A limit connecting plate is provided on the platform guide rail. One side of the limit connecting plate is fixedly connected to the platform side, and the other side is provided with limit blocks at intervals from front to back. The clamping block is inserted between adjacent limit blocks to fixedly connect the platform side to the platform frame.

8. The boarding device according to claim 6 or 7, characterized in that: A platform side guiding mechanism is provided on the platform frame.

9. The boarding device according to claim 8, characterized in that: The platform side guiding mechanism includes side column, inner guiding seat, inner roller, outer guiding seat, and outer roller. A side column is provided inside the platform side. The lower end of the side column is fixedly connected to the platform frame. An inner guiding seat is provided on the side column, and the inner guiding seat is fixedly connected to the side column. An inner roller is installed on the inner guiding seat. An outer guiding seat is provided on the inner guiding seat, and the outer guiding seat is fixedly connected to the inner guiding seat. An outer roller is installed on the outer guiding seat. The inner roller is matched with the outer roller. One side of the platform side abuts against the inner roller, and the other side abuts against the outer roller.

10. A boarding device according to claim 9, characterized in that: A connecting slot is provided on the inner guiding seat, and a slot pin hole is provided on the connecting slot. The inner roller is installed on the inner roller shaft, and the upper and lower ends of the inner roller shaft are fixedly connected to the inner guiding seat. A plug rod is provided on the outer guiding seat, and the upper end of the plug rod is fixedly connected to the outer guiding seat. A plug rod pin hole is provided on the plug rod. The plug rod is inserted into the connecting slot, and a guiding pin passes through the slot pin hole and the plug rod pin hole to fixedly connect the plug rod to the inner guiding seat. The outer roller is sleeved on the outer roller shaft, and the upper and lower ends of the outer roller shaft are fixedly connected to the outer guiding seat.

11. A boarding device according to claim 9 or 10, characterized in that: A guiding rod is provided at the lower end of the side column, and a threaded hole is provided at the lower end of the side column. A guiding groove is provided on the platform frame. The upper end of the guiding rod is fixedly connected to the side column, and the lower end is inserted into the guiding groove. The side column is threadedly connected to the platform frame through a screw.

12. The boarding device according to claim 3, wherein: A ladder limit connection mechanism is provided between the middle ladder and the lower ladder. The ladder limit connection mechanism includes a limit plate, a ladder limit fixing seat, a baffle, a limit spring, and a limit handle. Limit plates are respectively provided on both sides of the rear part of the lower end of the middle ladder. The limit plates are fixedly connected to the middle ladder. A limit slot is provided at the lower end of the limit plate. Ladder limit fixing seats are provided on both sides of the front end of the lower ladder. The ladder limit fixing seats are fixedly connected to the lower ladder. A limit through hole is provided on the ladder limit fixing seat. A baffle is inserted through the limit through hole. A limit spring is provided in the limit through hole. The upper end of the baffle passes through the limit through hole and extends into the limit slot to limit the connection between the ladder limit fixing seat and the limit plate. The lower end of the baffle passes through the limit through hole and is provided with a limit handle. The spring is sleeved on the baffle. One end of the spring is connected to the baffle, and the other end is connected to the ladder limit fixing seat. The upper end of the limit handle is fixedly connected to the baffle.

13. A boarding device according to claim 12, characterized in that: The baffle includes an upper baffle segment and a lower baffle segment. The upper end of the upper baffle segment is matched with the limit slot. The lower end of the upper baffle segment is fixedly connected to the lower baffle segment. The outer diameter of the upper baffle segment is larger than that of the lower baffle segment. The limit spring is sleeved on the lower baffle segment. The upper end of the limit spring abuts against the lower end face of the upper baffle segment, and the lower end abuts against the ladder limit fixing seat. The outer diameter of the limit handle is larger than the inner diameter of the limit through hole.

14. A boarding device according to claim 12 or 13, characterized in that: The lower ladder includes a first ladder and a second ladder. Rollers are respectively installed on both sides of the first ladder. The first ladder is slidably connected to the lower track of the rear chassis through the rollers. The rear end of the first ladder is hinged to the front end of the second ladder. Ladder limit fixing seats are provided on both sides of the front end of the first ladder. The ladder limit fixing seats are fixedly connected to the first ladder.

15. A boarding device according to claim 12 or 13, characterized in that: A guiding surface extends downward and backward from the front end face of the limit plate.

16. A boarding device according to claim 6 or 7 or 9 or 10 or 12 or 13, characterized in that: A platform foldable connection mechanism is provided on the platform frame. The platform frame includes a front platform segment and a rear platform segment. The front platform segment is connected to the rear platform segment through the platform foldable connection mechanism.

17. A boarding device according to claim 16, characterized in that: The platform foldable connection mechanism includes a front hinge block, a hinge connecting plate, a front connecting block, a rear hinge block, a rear connecting block, and a connecting pin. A front hinge block is provided at the rear end of the front platform segment. The front end of the front hinge block is fixedly connected to the front platform segment, and a hinge shaft hole is provided at the rear end. Hinge connecting plates are provided on both sides of the front hinge block. A front connecting block is provided at the lower end of the front hinge block. The front connecting block is fixedly connected to the front hinge block. A front connecting pin hole extends backward from the rear end of the front connecting block. A rear hinge block is provided at the front end of the rear platform segment. A hinge shaft hole is provided at the front end of the rear hinge block, and the rear end is fixedly connected to the rear platform segment. A rear connecting block is provided at the lower end of the rear hinge block. The rear connecting block is fixedly connected to the rear hinge block. A rear connecting pin hole extends forward from the front end of the rear connecting block. The front end of the hinge connecting plate is hinged to the front hinge block through a front hinge shaft, and the rear end is hinged to the rear hinge block through a rear hinge shaft. The rear end of the front connecting block and the front end of the rear connecting block are opposite. The front connecting block and the rear connecting block are fixedly connected through a connecting pin, a front connecting pin hole, and a rear connecting pin hole.

18. A boarding device according to claim 16, characterized in that: A flip pedal is provided between the front section and the rear section of the platform. The front end face of the flip pedal abuts against the rear end face of the front section of the platform, and the rear end face abuts against the front end face of the rear section of the platform. The rear end of the flip pedal is hinged to the rear section of the platform. A flip connection block is provided on the lower end face of the flip pedal. The flip connection block is fixedly connected to the flip pedal. A flip pin hole is provided on the flip connection block. A flip connection pin hole is provided on the rear end face of the front section of the platform. A flip insertion pin passes through the flip pin hole and the flip connection pin hole to fixedly connect the flip connection block to the front section of the platform.

19. A boarding device according to claim 16, characterized in that: A platform folding limit mechanism is provided between the front section and the rear section of the platform.

20. A boarding device according to claim 19, wherein: The platform folding limit mechanism includes a platform limit shaft, a platform limit hook, a hook pin shaft and a torsion spring. The platform limit shaft is provided on at least one side of the front section of the platform. The platform limit shaft is fixedly connected to the front section of the platform. The platform limit hook is provided on at least one side of the rear section of the platform. The platform limit hook is hinged to the rear section of the platform via the hook pin shaft. The torsion spring is sleeved on the hook pin shaft. The platform limit hook is limit-connected to the rear section of the platform via the torsion spring. When the front section and the rear section of the platform are folded, the platform limit hook hooks the platform limit shaft to limit-connect the front section and the rear section of the platform.

21. A boarding device according to any one of claims 1-3, 6-7, 9-10, 12-13, 17-20, characterized in that: Ladder side hulls are provided on both sides of the ladder body. A ladder side hull quick connection mechanism is provided at the lower end of the ladder side hull.

22. A boarding device according to claim 21, characterized in that: The ladder side hull quick connection mechanism includes a side hull connection frame, a locking screw and a plug column. The side hull connection frames are fixedly provided on both sides of the ladder body. A side hull card slot is provided at the upper end of the side hull connection frame. Plug holes are provided at intervals on the side hull connection frame. A locking hole is provided on the side of the plug hole and is communicated with the plug hole. The locking screw is provided in the locking hole. Plug columns are provided at intervals at the lower end of the ladder side hull. The upper end of the plug column is fixedly connected to the ladder side hull. The outer diameter of the upper end of the plug column matches the inner diameter of the plug hole. The outer diameter of the upper part of the plug column is larger than the outer diameter of the lower part of the plug column. The lower end of the ladder side hull is clamped into the side hull card slot. The plug column is inserted into the plug hole. The locking screw passes through the locking hole and abuts against the plug column. The locking screw is threadedly connected to the side hull connection frame to fixedly connect the ladder side hull to the side hull connection frame.

23. A boarding device according to any one of claims 2-3, 6-7, 9-10, 12-13, 17-20, characterized in that: The trapezoid lifting mechanism includes a simply supported beam group and a lifting drive cylinder. The simply supported beam groups are symmetrically arranged on both sides of the front chassis. The simply supported beam group includes an outer lower simply supported beam, an inner lower simply supported beam, an outer upper simply supported beam, and an inner upper simply supported beam. Lifting guide rails are arranged on both sides of the front chassis. The outer lower simply supported beams are arranged on both sides of the front part of the front chassis, and the inner lower simply supported beams are arranged on both sides of the rear part of the front chassis. The lower end of the outer lower simply supported beam is equipped with rollers, and the outer lower simply supported beam is slidably connected to the front chassis through the rollers and the lifting guide rails. The middle part of the outer lower simply supported beam is hinged to the inner lower simply supported beam on the same side. The upper end of the outer lower simply supported beam is provided with an outer upper simply supported beam. The lower end of the inner lower simply supported beam is hinged to the front chassis, and the upper end is provided with an inner upper simply supported beam. The lower end of the outer upper simply supported beam is hinged to the outer lower simply supported beam, and the middle part of the outer upper simply supported beam is hinged to the inner upper simply supported beam on the same side. The upper end of the outer upper simply supported beam is equipped with rollers, and the lower end of the inner upper simply supported beam is hinged to the inner lower simply supported beam, and the upper end is hinged to the upper frame. Frame guide rails are arranged on both sides of the upper frame. The outer upper simply supported beam is slidably connected to the upper frame through the rollers and the frame guide rails. A lifting drive cylinder is arranged between the inner upper simply supported beam and the inner lower simply supported beam. One end of the lifting drive cylinder is hinged to the inner upper simply supported beam, and the other end is hinged to the inner lower simply supported beam.

24. A boarding device according to claim 23, characterized in that: A retractable support mechanism is arranged between the front chassis and the upper frame.

25. A boarding device according to claim 24, characterized in that: The retractable support mechanism includes a front retractable rod and a rear retractable rod. The front retractable rods are respectively arranged on both sides of the front end of the upper frame, and the rear retractable rods are respectively arranged on both sides of the rear end of the upper frame. The front retractable rod and the rear retractable rod are respectively telescopic rods. The upper end of the front retractable rod is hinged to the upper frame, and the lower end is detachably connected to the chassis. The upper end of the rear retractable rod is hinged to the upper frame, and the lower end is detachably connected to the chassis.

26. A boarding device according to claim 25, characterized in that: On the inner upper simply supported beam on the same side of the front retractable rod, there is a front guiding and limiting roller. The front retractable rod includes a front upper support rod and a front lower support rod. The upper end of the front upper support rod is hinged to the upper frame, and the lower end is inserted into the front lower support rod. The front upper support rod is slidably connected to the front lower support rod. There is a front upper pin hole in the lower part of the front upper support rod, and a front lower pin hole in the upper part of the front lower support rod. The lower end of the front lower support rod is detachably connected to the front chassis. The front upper support rod is fixedly connected to the front lower support rod through a front locking pin, the front upper pin hole, and the front lower pin hole. There is a front clamping plate on the side wall of the front lower support rod. The front clamping plate is fixedly connected to the front lower support rod. There is a clamping groove on the front clamping plate. The front guiding and limiting roller is placed in the clamping groove of the front clamping plate. The front guiding and limiting roller abuts against the front clamping plate to limit the front lower support rod on the inner upper simply supported beam. On the outer lower simply supported beam on the same side of the rear retractable rod, there is a rear guiding and limiting roller. The rear retractable rod includes a rear upper support rod and a rear lower support rod. The upper end of the rear upper support rod is hinged to the upper frame, and the lower end is inserted into the rear lower support rod. The rear upper support rod is slidably connected to the rear lower support rod. There is a rear upper pin hole in the lower part of the rear upper support rod, and a rear lower pin hole in the upper part of the rear lower support rod. The lower end of the rear lower support rod is detachably connected to the front chassis. The rear upper support rod is fixedly connected to the rear lower support rod through a rear locking pin, the rear upper pin hole, and the rear lower pin hole. There is a rear clamping plate on the side wall of the rear lower support rod. The rear clamping plate is fixedly connected to the rear lower support rod. There is a clamping groove on the rear clamping plate. The rear guiding and limiting roller is placed in the clamping groove of the rear clamping plate. The rear guiding and limiting roller abuts against the rear clamping plate to limit the rear lower support rod on the outer lower simply supported beam.

27. A boarding device according to claim 26, characterized in that: There is a connecting groove at the lower end of the front lower support rod, and a connecting groove at the lower end of the rear lower support rod. There is a connecting pin hole on the connecting groove. On both sides of the front end and both sides of the rear end of the front chassis, there are insertion rods respectively. The lower end of the insertion rod is fixedly connected to the front chassis. There is a positioning pin hole on the insertion rod. The insertion rod is inserted into the connecting groove, and the positioning pin passes through the connecting pin hole and the positioning pin hole to fixedly connect the front lower support rod or the rear lower support rod with the insertion rod.

28. A boarding device according to claim 23, characterized in that: There is a frame automatic height measuring mechanism on the ladder body lifting mechanism. The frame automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. An induction frame is arranged between the inner upper simply supported beam and the inner lower simply supported beam. There is an induction groove on the induction frame. The upper end of the induction plate is hinged to the inner upper simply supported beam. The induction plate is placed in the induction groove and is slidably connected to the induction frame. There are induction holes arranged at intervals along the sliding direction of the induction plate on the induction plate. The inductor is arranged at the upper end of the induction groove and is hinged to the inner lower simply supported beam at the lower end. The inductor is fixedly connected to the induction frame. The inductor cooperates with the induction holes for induction.

29. A boarding device according to any one of claims 2-3, 6-7, 9-10, 12-13, 17-20, 24-28, characterized in that: An upper ladder automatic height measuring mechanism is provided between the upper frame and the upper ladder. The upper ladder automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. The induction frame is provided on the upper frame. An induction groove is provided on the induction frame. The induction plate is provided in the induction groove. The lower end of the induction frame is hinged to the upper frame. The induction plate is slidably connected to the induction frame. The upper end of the induction plate is hinged to the upper ladder. Induction holes are provided at intervals along the sliding direction of the induction plate on the induction plate. The inductor is provided at the upper end of the induction groove. The inductor is fixedly connected to the induction frame. The inductor cooperates with the induction holes for induction.

30. A boarding device according to any one of claims 2-3, 6-7, 9-10, 12-13, 17-20, 24-28, characterized in that: A support locking mechanism is provided on the upper ladder adjusting drive cylinder. The support locking mechanism includes teeth, a pawl drive cylinder, and a pawl. Teeth are fixedly provided on the rod wall of the telescopic rod of the upper ladder adjusting drive cylinder. The pawl drive cylinder is provided on the cylinder seat of the upper ladder adjusting drive cylinder. The telescopic rod of the pawl drive cylinder is fixedly connected with a pawl. The pawl cooperates with the teeth to lock the position of the telescopic rod of the upper ladder adjusting drive cylinder.

31. A boarding device according to claim 30, characterized in that: A pawl clamping mechanism is provided on the pawl drive cylinder. The pawl clamping mechanism includes a clamping adjustment plate, a first pin shaft, a second pin shaft, a clamping spring, a pawl shaft connecting plate, and a pawl shaft. The telescopic rod of the pawl drive cylinder is provided with a clamping adjustment plate. One end of the clamping adjustment plate is provided with a first pin shaft, and the other end is provided with a second pin shaft. Clamping springs are provided on both sides of the clamping adjustment plate. One end of the clamping adjustment plate is provided with a shaft hole, and the other end is provided with a long hole. The clamping adjustment plate is hinged to the telescopic rod of the pawl drive cylinder through the first pin shaft. The second pin shaft passes through the long hole. Pawl shaft connecting plates are provided at both ends of the second pin shaft. One end of the pawl shaft connecting plate is fixedly connected to the second pin shaft, and the other end is fixedly connected to the pawl shaft. The pawl is fixedly arranged on the pawl shaft. One end of the clamping spring is connected to the first pin shaft, and the other end is connected to the second pin shaft.

32. A boarding device according to claim 6 or 7 or 9 or 10, characterized in that: A retracting pin hole is provided between both ends of the platform support rod.

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