Docking boarding apparatus assembly method

Abstract

The present application belongs to the technical field of mechanical equipment in aviation industry, and particularly relates to a docking boarding equipment assembling method, which comprises a front ladder body module and a rear ladder body module, the front ladder body module comprises a front chassis, a front ladder body lifting support mechanism and a front ladder body, the rear ladder body module comprises a rear chassis and a rear ladder body, and the docking and unfolding assembling method of the front ladder body module and the rear ladder body module comprises the following steps: first step: inserting and fixing the front chassis and the rear chassis; second step: starting the front ladder body lifting support mechanism, hanging the hanging pin shaft at the rear end of the upper frame with the hanging hook at the front end of the rear ladder body, unfolding the front ladder body and the rear ladder body, the front ladder body module and the rear ladder body module can be disassembled, and the steps are as follows: step one: starting the front ladder body lifting support mechanism, separating the front ladder body from the rear ladder body, and step two: separating the front chassis from the rear chassis, wherein the present application is connected through hanging, can be disassembled into two modules when not in use, has small occupied space, is convenient to transport, is stable in support and limited, can be disassembled from the side, and the platform can be folded.

Description

Technical Field

[0001] This invention belongs to the field of aviation mechanical equipment technology, specifically referring to a method for assembling docking boarding equipment. Background Technology

[0002] A boarding ladder is a type of ladder that connects the ground to the aircraft cabin door, allowing passengers, crew, ground staff, and maintenance personnel to board and alight from the aircraft. Some boarding ladders are built into the aircraft cabin door and open after the aircraft has landed and come to a complete stop; these are typically suitable for small business jets. Another type of boarding ladder is movable, not inside the aircraft, and has wheels or is mounted on a vehicle, allowing it to move freely. A search revealed that Chinese patent CN113277110A discloses a passenger boarding ladder, including a chassis and an inclined fixed ladder. One end of the chassis is hinged to a support frame extending upwards at an incline towards the other end. The chassis has a drive assembly on its upper side that can drive the support frame to swing around the hinge point between it and the chassis. A sliding ladder that can reciprocate along its length is connected to the support frame. A fixed ladder is arranged in the same direction as the sliding ladder. The lower end of the fixed ladder is hinged to the support frame, and the upper end rests on the sliding ladder. The shortcomings of the above patent are: firstly, the patent uses a fixed ladder and a sliding ladder, with the sliding ladder reciprocating on the support frame. However, this sliding method is prone to jamming and poor sliding, requiring timely inspection and maintenance by operators, resulting in maintenance costs. Firstly, the fixed ladder and sliding ladder in the aforementioned patent are a single unit. When the fixed ladder is not in use, it needs to be transported or towed as a whole, resulting in high transportation costs and large space requirements. Secondly, the lower end of the sliding ladder in the aforementioned patent is connected to the chassis via a drive assembly, which includes two telescopic rods, two telescopic components, and one telescopic component. However, the telescopic length of a single cylinder, hydraulic cylinder, or electric push rod is limited, thus limiting the lifting height of the boarding ladder and making it unsuitable for docking with aircraft with high cabin doors. Thirdly, the lack of support between the sliding ladder and the chassis in the aforementioned patent leads to... The slide is unstable and has poor stability. Fifth, there is no limiter between the fixed ladder and the slide in the platform of the above patent, making the slide prone to sliding. When there are many tourists, the slide may slip when stepped on, causing panic. Sixth, the side rails installed on the docking platform or the side rails installed on the fixed ladder in the above patent are fixed. This means that once a problem occurs, the entire boarding ladder cannot be used and needs to wait for repair. The repair time is unknown, which greatly reduces the boarding ladder's efficiency. Seventh, the docking platform in the above patent has a fixed structure and occupies a lot of space when not in use. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a novel assembly method for docking and boarding equipment that features a hook-and-loop connection, can be disassembled into two modules when not in use, occupies little space, is easy to transport, has low cost, provides stable support with limited positioning, has detachable side panels, and a foldable platform.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for assembling boarding equipment, characterized by: a method for assembling and deploying a front ladder module and a rear ladder module, wherein the front ladder module includes a front chassis, a front ladder lifting support mechanism, and a front ladder, and the rear ladder module includes a rear chassis and a rear ladder. The method for assembling and deploying the front and rear ladder modules includes the following steps: Step 1: Move the rear chassis of the rear ladder module to the rear side of the front chassis of the front ladder module, and insert and fix the front chassis and the rear chassis; Step 2: Activate the front ladder lifting support mechanism to drive the front ladder to rise. As the upper frame of the front ladder lifting support mechanism rises, the hook pin at the rear end of the upper frame engages with the hook at the front end of the rear ladder, and the upper frame lifts with the front end of the rear ladder, thus deploying the front and rear ladders.

[0005] The front ladder of the present invention includes an upper ladder, a docking platform at the front end of the upper ladder, the front end of the upper ladder being hinged to the rear end of the docking platform, a platform support rod between the upper ladder and the docking platform, a support pin hole at the front end of the platform support rod, a platform pin hole at the lower end of the docking platform, and a retractable pin hole between the two ends of the platform support rod. The docking platform includes a platform frame. After the first step, the support pin at the front end of the platform support rod is pulled out from the retractable pin hole and the platform pin hole. The platform frame of the docking platform rotates upward and forward around its hinge point with the upper ladder, rotating the platform frame to a horizontal position so that the support pin hole at the front end of the platform support rod corresponds to the platform pin hole. The support pin is then passed through the support pin hole and the platform pin hole, and the platform frame is horizontally fixed to the front end of the upper ladder.

[0006] The platform frame of this invention includes a front platform section and a rear platform section. The rear end of the front platform section has a front hinge block, the front end of which is fixedly connected to the front platform section. The lower end of the front hinge block has a front connecting block, which is fixedly connected to the front hinge block. The rear end of the front connecting block extends rearward and has a front connecting pin hole. The front end of the rear platform section has a rear hinge block, the lower end of which has a rear connecting block, which is fixedly connected to the rear hinge block. The front end of the rear connecting block extends forward and has a rear connecting pin hole. The rear ends of the front and rear connecting blocks are opposite each other. The front and rear connecting blocks are fixedly connected via connecting pins, the front connecting pin hole, and the rear connecting pin hole. A flip pedal is provided between the front and rear platform sections. The rear end of the flip pedal is hinged to the rear platform section. The lower end face of the flip pedal has a flip connecting block, which is fixedly connected to the flip pedal. The connecting block is provided with a flip pin hole, and the rear end face of the front section of the platform is provided with a flip connecting pin hole. The flip pin passes through the flip pin hole and the flip connecting pin hole to fix the flip connecting block to the front section of the platform. The front section of the platform is provided with a platform limiting shaft on at least one side, and the platform limiting shaft is fixedly connected to the front section of the platform. The rear section of the platform is provided with a platform limiting hook on at least one side, and the platform limiting hook is hinged to the rear section of the platform via a hook pin shaft. A torsion spring is sleeved on the hook pin shaft, and the platform limiting hook is limitedly connected to the rear section of the platform via the torsion spring. After the platform frame is rotated to a horizontal state and fixed, the platform frame is unfolded, and the hook end of the platform limiting hook is pulled backward so that the hook end of the platform limiting hook is away from the platform limiting shaft. The front section of the platform is rotated upward and forward until the front section of the platform is in a horizontal state. The connecting pin is inserted, and the flip pedal is rotated upward and forward until the front section of the flip pedal abuts against the front section of the platform. The flip pin is inserted.

[0007] The platform frame of this invention has platform sidewalls on both the left and right sides. A platform roller is located on the left side of the platform frame from front to back. Connecting plates are located on both sides of the platform frame. One end of each connecting plate is fixedly connected to the platform frame via a pressing spring, and the other end extends outward and downward to form a locking block. A platform guide rail is located at the lower end of each platform sidewall. A limiting connecting plate is located on the platform guide rail. One side of the limiting connecting plate is fixedly connected to the platform sidewall, and the other side has limiting blocks spaced apart from front to back. A platform sidewall guiding mechanism is provided on the platform frame. The platform sidewall guiding mechanism includes a sidewall column, an inner guide seat, an inner roller, an outer guide seat, an outer roller, and a guide pin. A sidewall column is located on the inner side of the platform sidewall. A guide rod is located at the lower end of the sidewall column. A guide groove is provided on the platform frame. The upper end of the guide rod is fixedly connected to the sidewall column, and the lower end is inserted into the guide groove. The sidewall column is threadedly connected to the platform frame via screws. An inner guide seat is located on the sidewall column. One side of the inner guide seat is fixedly connected to the sidewall column, and the other side has a connecting slot. The connecting slot has inner rollers on both its front and rear sides. The connecting slot has slot pin holes. The outer guide seat has a rod and an outer roller. The rod has a rod pin hole. The rod is inserted into the connecting slot, and a guide pin passes through the slot pin hole and the rod pin hole to fix the rod to the inner guide seat. After the platform frame is unfolded, the platform side is installed. First, the platform side guide mechanism is installed. The guide rod at the lower end of the side column is inserted into the guide groove of the platform frame. The side column is then fixed to the platform frame with screws. The inner guide seat is fixed to the side column with screws. The insert rod of the outer guide seat is inserted into the connecting slot of the inner guide seat. The guide pin is inserted to fix the inner guide seat and the outer guide seat. Press the connecting plate to make the locking block rise and push the platform side from front to back. The platform guide rail of the platform side is sleeved on the platform roller. The upper end of the platform side passes through the guide space between the inner roller and the outer roller until the platform side moves into place. Stop pressing the connecting plate so that the locking block is locked between the adjacent limiting blocks, and fix the platform side to the platform frame.

[0008] The rear chassis of the present invention has a rear connecting seat fixedly provided at the front end of the frame, and the front chassis has a front connecting seat fixedly provided at the rear end of the frame. The rear connecting seat and the front connecting seat are respectively provided with pin holes. In the first step, the rear connecting seat of the rear chassis is brought close to the front connecting seat of the front chassis, and the connecting pin is inserted to limit the connection between the front connecting seat and the rear connecting seat.

[0009] The present invention provides a ladder-type lifting mechanism on the front chassis. The upper end of the ladder-type lifting mechanism has an upper frame, and its lower end is connected to the front chassis, while its upper end is connected to the upper frame. The ladder-type lifting mechanism includes a simple-supported beam assembly and a lifting drive cylinder. The front chassis has symmetrically arranged simple-supported beam assemblies on both sides. Each simple-supported beam assembly 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. The front of the front chassis frame has outer lower simple-supported beams on both sides, and the rear of the front chassis has inner lower simple-supported beams on both sides. The upper ends of the outer lower simple-supported beams have outer upper simple-supported beams, and the upper ends of the inner lower simple-supported beams have inner upper simple-supported beams. A lifting drive cylinder is provided between the inner upper simply supported beam and the inner lower simply supported beam. A retraction support mechanism is provided between the front chassis and the upper frame. The retraction support mechanism includes a front retraction rod, a rear retraction rod, a front guide limiting roller, a front clamping plate, a rear guide limiting roller, and a rear clamping plate. Front retraction rods are provided on both sides of the front end of the upper frame, and rear retraction rods are provided on both sides of the rear end of the upper frame. A front guide limiting roller is provided on the inner upper simply supported beam on the same side as the front retraction rod. The front retraction 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 upper support rod is slidably connected to the lower front support rod. A front retaining plate is provided on the side wall of the lower front support rod. A rear guide limiting roller is provided on the outer lower simply supported beam on the same side as 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 and the rear lower support rod are slidably connected. A rear retaining plate is provided on the side wall of the lower rear support rod. In the second step, the lifting drive cylinder is activated, the telescopic rod of the lifting drive cylinder extends, driving the upper frame to rise. The upper front support rod extends from inside the lower front support rod, and the front retractable rod swings downward and forward. When the front retractable lever is nearly vertical, the upper rear support rod extends from the lower rear support rod. The rear retractable lever swings downward and backward until it is nearly vertical. Then, close the lifting drive cylinder, remove the front retaining plate of the front retractable lever from the front guide limit roller, pull down the lower front support rod of the front retractable lever, and insert the lower end of the lower front support rod into the front chassis. Lock the upper front support rod and the lower front support rod in place. Remove the rear retaining plate of the rear retractable lever from the rear guide limit roller, pull down the lower rear support rod, and insert the lower end of the lower rear support rod into the front chassis. Lock the upper rear support rod and the lower rear support rod in place.

[0010] The present invention provides an upper ladder adjustment drive cylinder 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 via the upper ladder adjustment drive cylinder. After the second step, the upper ladder adjustment drive cylinder is activated, and the telescopic rod of the upper ladder adjustment drive cylinder extends to lift the docking platform and the front end of the upper ladder. After the docking platform is raised to the position, the upper ladder adjustment drive cylinder is closed.

[0011] The ladder adjustment drive cylinder of the present invention is provided with a support and locking mechanism. The support and locking mechanism includes teeth, a pawl drive cylinder and a pawl. Teeth are fixedly provided on the wall of the telescopic rod of the ladder adjustment drive cylinder. A pawl drive cylinder is provided on the cylinder seat of the ladder adjustment drive cylinder. A pawl is fixedly connected to the telescopic rod of the pawl drive cylinder. The pawl and teeth cooperate to lock the position of the telescopic rod of the ladder adjustment drive cylinder. After the docking platform rises to the position, the pawl drive cylinder is activated, and the telescopic rod of the pawl drive cylinder extends, so that the pawl contacts the teeth and fixes the position of the telescopic rod of the ladder adjustment drive cylinder.

[0012] The rear ladder of this invention includes a middle ladder, a first ladder, and a second ladder. The middle ladder unfolds as the upper frame rises. Pulling the second ladder backward causes the first ladder to move horizontally backward. Then, the second ladder rotates downward around its hinge point with the first ladder until the support wheel at the rear end of the second ladder contacts the ground. The front end of the second ladder then aligns with the middle ladder, thus unfolding the rear ladder. The rear chassis has lower rails at both ends, located on the chassis frame and fixedly connected to it. An upper rail is mounted on the lower rails. The rear chassis frame is fixedly connected. The upper end of the middle ladder is provided with hooks on both sides. The upper end of the hooks is engaged with the hook pin and connected. The lower end of the hooks is fixedly connected to the middle ladder. Rollers are installed on both sides of the lower end of the middle ladder. The lower end of the middle ladder is movably connected to the upper rail of the rear chassis via the rollers. Rollers are installed on both sides of the first ladder. The first ladder is slidably connected to the lower rail of the rear chassis via the rollers. The rear end of the first ladder is hinged to the front end of the second ladder. The upper end of the second ladder is engaged with the middle ladder. Support wheels are installed on both sides of the lower end of the second ladder.

[0013] In this invention, the second ladder drives the first ladder to move horizontally backward. Before the second ladder rotates downward, the baffle of the ladder limiting connection mechanism at the front end of the first ladder automatically slides into the limiting slot of the limiting plate, limiting and fixing the positions of the intermediate ladder and the first ladder. The ladder limiting connection mechanism includes a limiting plate, a ladder limiting fixing seat, and a baffle. Limiting plates are respectively provided on both sides of the lower rear end of the intermediate ladder. The limiting plates are fixedly connected to the intermediate ladder. The lower end of the limiting plate is provided with a limiting slot. Ladder limiting fixing seats are provided on both sides of the front end of the first ladder. The ladder limiting fixing seats are fixedly connected to the first ladder. The ladder limiting fixing seats are provided with limiting through holes, and a baffle passes through the limiting through holes.

[0014] The present invention provides ladder sidewalls on both sides of the upper ladder, ladder sidewalls on both sides of the middle ladder, and ladder sidewalls on both sides of the second ladder. A quick-connect mechanism for the ladder sidewalls is provided at the lower end of each sidewall. This quick-connect mechanism includes a sidewall connecting frame, locking screws, and insertion pins. Sidewall connecting frames are fixedly provided on both sides of the upper ladder, the middle ladder, and the second ladder. A sidewall slot is provided at the upper end of each sidewall connecting frame. Insertion holes are spaced apart on the sidewall connecting frame. Locking holes are provided on the side of each insertion hole, communicating with the insertion holes and containing locking screws. Insertion pins are spaced apart at the lower end of each ladder sidewall, with the upper end of each insertion pin fixed to the ladder sidewall. For a fixed connection, the outer diameter of the upper end of the plug-in post matches the inner diameter of the plug-in hole. The outer diameter of the upper part of the plug-in post is larger than the outer diameter of the lower part of the plug-in post. The lower end of the ladder side is inserted into the side slot, the plug-in post is inserted into the plug-in hole, and the locking screw passes through the locking hole and abuts against the plug-in post. The locking screw is threadedly connected to the side connecting frame to fix the ladder side to the side connecting frame. After the ladder is unfolded, ladder side panels are installed on both sides of the front ladder, both sides of the middle ladder, and both sides of the second ladder. The ladder side panels are inserted into the side slots of the side connecting frame on one side of the front ladder, middle ladder, or second ladder. The plug-in post at the lower end of the ladder side is inserted into the plug-in hole. The locking screw is rotated so that the front end of the locking screw abuts against the plug-in post, fixing the ladder side to the side connecting frame.

[0015] The assembly method for docking boarding equipment described in this invention also includes a method for disassembling the front ladder module and the rear ladder module. The method for disassembling the front ladder module and the rear ladder module includes the following steps: Step 1: Activate the lifting drive cylinder of the front ladder lifting support mechanism. The telescopic rod of the lifting drive cylinder retracts, and the simply supported beam assembly retracts accordingly, causing the upper frame and the front ladder on the upper frame to fall. As the upper frame descends, the hook pin at the rear end of the upper frame axially disengages from the hook at the front end of the rear ladder, and the upper frame, along with the front ladder, falls back onto the front chassis. The lifting drive cylinder is then deactivated. Step 2: Remove the connecting pin between the front connecting seat of the front chassis and the rear connecting seat of the rear chassis to separate the front connecting seat and the rear connecting seat, thus separating the front chassis and the rear chassis. Step 3: Retract the rear ladder onto the rear chassis, completing the disassembly of the front ladder module and the rear ladder module.

[0016] In step one of this invention, before starting the lifting drive cylinder, the retraction support mechanism is retracted, and the positioning pins connecting the lower ends of the front and rear retraction rods to the front chassis are removed. Then, the front locking pin on the front retraction rod and the rear locking pin on the rear retraction rod are removed respectively. The front lower support rod of the front retraction rod is then retracted upwards, and the front lower support rod is rotated backwards so that the front locking plate of the front lower support rod is locked on the front guide limit roller. Finally, the rear lower support rod of the rear retraction rod is retracted upwards. Rotate the lower rear support rod forward so that its rear locking plate engages with the rear guide limit roller. Activate the lifting drive cylinder. As the upper frame descends, the distance between the hinge point between the upper end of the front retractable rod and the upper frame and the front guide limit roller decreases. The front retractable rod gradually retracts, and the upper front support rod gradually enters the lower front support rod. The front retractable rod swings backward until it is horizontal. Simultaneously, as the upper frame moves downward, the rear retractable rod and the rear guide limit roller... The distance between them gradually decreases, the rear retractable rod gradually retracts, the upper rear support rod gradually enters the lower rear support rod, and the rear retractable rod gradually swings forward and upward until it becomes horizontal. At this time, the lifting mechanism descends to its lowest point, and the front retractable rod is placed horizontally on the rear retractable rod. The lower end of the lower front support rod is provided with a connecting groove. The upper front support rod is fixedly connected to the lower front support rod via a front locking pin, a front upper pin hole, and a front lower pin hole. The lower end of the lower rear support rod is provided with a connecting groove. The upper rear support rod is fixedly connected to the lower rear support rod via a rear locking pin, a rear upper pin hole, and a rear lower pin hole. The connecting groove is provided with a connecting pin hole. The front and rear sides of the front chassis frame are respectively provided with plug-in rods. The lower end of the plug-in rod is fixedly connected to the front chassis frame. The plug-in rod is provided with a positioning pin hole. The plug-in rod is inserted into the connecting groove, and the positioning pin passes through the connecting pin hole and the positioning pin hole to fix the lower front support rod or the lower rear support rod to the plug-in rod.

[0017] In step one of the present invention, the front ladder body includes an upper ladder, and a docking platform is provided at the front end of the upper ladder. The docking platform includes a platform frame and a platform side. To remove the platform side, first remove the platform side guide mechanism, pull out the guide pin, remove the outer guide seat, then remove the screw at the lower end of the side column, remove the side column from the platform frame, press the connecting plate to disengage the locking block from the limiting block, and then pull the platform side forward to remove it. The platform frame has platform side sections on both the left and right sides. The left side of the platform frame has platform rollers from front to back. The platform frame has connecting plates on both the left and right sides. One end of the connecting plate is fixedly connected to the platform frame via a pressing spring, and the other end extends outward and downward to form a locking block. The lower end of the platform side is provided with a platform guide rail, and a limiting connecting plate is provided on the platform guide rail. One side of the limiting connecting plate is fixedly connected to the platform side, and the other side extends outward and downward to form a locking block. The platform frame is equipped with a platform side guide mechanism, which includes a side column, an inner guide seat, an inner roller, an outer guide seat, an outer roller, and a guide pin. A side column is located on the inner side of the platform side, with a guide rod at its lower end. A guide groove is provided on the platform frame. The upper end of the guide rod is fixedly connected to the side column, and its lower end is inserted into the guide groove. The side column is threadedly connected to the platform frame with screws. An inner guide seat is located on the side column, with one side fixedly connected to the side column and the other side having a connecting slot. Inner rollers are located on both the front and rear sides of the connecting slot, and a slot pin hole is provided on the connecting slot. An outer guide seat is equipped with a rod and an outer roller, with a rod pin hole. The rod is inserted into the connecting slot, and the guide pin passes through the slot pin hole and the rod pin hole to fix the rod to the inner guide seat.

[0018] The rear ladder of this invention includes a middle ladder and a lower ladder. The lower ladder includes a first ladder and a second ladder. The upper ladder, the middle ladder, and the second ladder all have side flanks on both sides. A quick-connect mechanism for the side flanks is provided at the lower end of each side flank. This quick-connect mechanism includes a side flank connecting frame, locking screws, and insertion pins. Side flank connecting frames are fixedly provided on both sides of the upper ladder, the middle ladder, and the second ladder. A side flank slot is provided at the upper end of each side flank connecting frame. Insertion holes are spaced apart on the side flank connecting frame, and locking holes are provided on the side of each insertion hole. The locking holes are connected to the insertion holes. The connecting holes are connected, and a locking screw is provided in the locking hole. The lower end of the ladder side is provided with a plug-in post. The upper end of the plug-in post is fixedly connected to the ladder side. The outer diameter of the upper end of the plug-in post matches the inner diameter of the plug-in hole. The outer diameter of the upper part of the plug-in post is larger than the outer diameter of the lower part of the plug-in post. The lower end of the ladder side is inserted into the side slot. The plug-in post is inserted into the plug-in hole. The locking screw passes through the locking hole and abuts against the plug-in post. The locking screw is threadedly connected to the side connecting bracket to fix the ladder side to the side connecting bracket. In step three, the ladder side is removed, the locking screw on the side connecting bracket is loosened so that the locking screw is separated from the plug-in post of the ladder side, and then the ladder side is pulled up.

[0019] The present invention includes an upper ladder adjustment drive cylinder 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 via the upper ladder adjustment drive cylinder. The upper ladder adjustment drive cylinder is equipped with a support locking mechanism, which includes teeth, a pawl drive cylinder, and a pawl. Teeth are fixedly provided on the wall of the telescopic rod of the upper ladder adjustment drive cylinder, and a pawl drive cylinder is provided on the cylinder seat of the upper ladder adjustment drive cylinder. A pawl is fixedly connected to the telescopic rod of the pawl drive cylinder. The pawl and teeth cooperate to lock the position of the telescopic rod of the upper ladder adjustment drive cylinder. In step one, the brake of the upper ladder adjustment drive cylinder is released, the pawl drive cylinder of the support locking mechanism is activated, the telescopic cylinder of the pawl drive cylinder retracts, causing the pawl to separate from the teeth, releasing the lock on the upper ladder adjustment drive cylinder, activating the upper ladder adjustment drive cylinder, the telescopic rod of the upper ladder adjustment drive cylinder retracts, the front end of the upper ladder, along with the docking platform, falls down, the upper ladder lands on the upper frame, and the upper ladder adjustment drive cylinder is closed.

[0020] The platform frame of this invention includes a front platform section and a rear platform section. The rear end of the front platform section has a front hinge block, the front end of which is fixedly connected to the front platform section. The lower end of the front hinge block has a front connecting block, which is fixedly connected to the front hinge block. The rear end of the front connecting block extends rearward and has a front connecting pin hole. The front end of the rear platform section has a rear hinge block, the lower end of which has a rear connecting block, which is fixedly connected to the rear hinge block. The front end of the rear connecting block extends forward and has a rear connecting pin hole. The rear ends of the front and rear connecting blocks are opposite each other. The front and rear connecting blocks are fixedly connected via connecting pins, front connecting pin holes, and rear connecting pin holes. A flip pedal is provided between the front and rear platform sections. The rear end of the flip pedal is hinged to the rear platform section. A flip connecting block is provided on the lower surface of the flip pedal, which is fixedly connected to the flip pedal. The flip connecting block has a flip pin hole. The rear end face of the platform section is provided with a flip-connecting pin hole. The flip-pin passes through the flip-connecting pin hole and the flip-connecting pin hole to fix the flip-connecting block to the front section of the platform. The front section of the platform is provided with a platform limiting shaft on at least one side. The platform limiting shaft is fixedly connected to the front section of the platform. The rear section of the platform is provided with a platform limiting hook on at least one side. The platform limiting hook is hinged to the rear section of the platform via a hook pin shaft. A torsion spring is sleeved on the hook pin shaft. The platform limiting hook is limited and connected to the rear section of the platform via the torsion spring. After the docking platform is lowered, the platform frame of the docking platform is folded, the flip pin at the lower end of the flip pedal is pulled out, and the flip pedal is rotated backward so that the flip pedal falls on the rear section of the platform. The connecting pins on the left and right sides of the platform frame are pulled out, and the front section of the platform is flipped backward so that the rear section of the platform is on the flip pedal and the rear section of the platform. The hook end at the upper end of the platform limiting hook is pulled backward so that the hook end of the platform limiting hook hooks the platform limiting shaft, thereby limiting and fixing the positions of the front section and the rear section of the platform.

[0021] The present invention includes a platform support rod between the upper ladder and the docking platform. The platform support rod has a support pin hole at its front end and a platform pin hole at its lower end. The front end of the platform support rod is hinged to the docking platform via the support pin, the support pin hole, and the platform pin hole, and the rear end is hinged to the upper ladder. A retractable pin hole is provided between the two ends of the platform support rod. After the platform frame is folded, it is bent downwards and fixed. The support pin connecting the front end of the platform support rod to the docking platform is removed. At this time, the platform frame can rotate around the hinge point between it and the upper ladder. The retractable pin hole of the platform support rod is aligned with the platform pin hole, and the support pin is inserted into the retractable pin hole and the platform pin hole to limit and fix the position of the platform frame and the upper ladder.

[0022] The rear ladder of this invention includes a middle ladder and a lower ladder, with a ladder limiting connection mechanism between them. This mechanism includes a limiting plate, a ladder limiting fixing seat, a baffle, a limiting spring, and a limiting handle. Limiting plates are respectively provided on both sides of the lower rear end of the middle ladder, and these plates are fixedly connected to the middle ladder. A limiting slot is provided at the lower end of each limiting plate. The rear end of the first ladder is hinged to the front end of the second ladder. The upper end of the second ladder mates with the middle ladder. Support wheels are installed on both sides of the lower end of the second ladder. Ladder limiting fixing seats are provided on both sides of the front end of the first ladder. The first ladder is fixedly connected. A limiting hole is provided on the ladder limiting fixing seat. A baffle plate passes through the limiting hole, and a limiting spring is installed within the limiting hole. The baffle plate includes an upper section and a lower section. The upper end of the upper section inserts into a limiting slot to limit and fix the front-to-back position of the first ladder and the intermediate ladder. The lower end of the upper section is fixedly connected to the lower section. The outer diameter of the upper section is larger than the outer diameter of the lower section. A limiting handle extends from the lower end of the lower section through the limiting hole. The lower section is fixedly connected to the limiting handle. The limiting spring is sleeved on the lower section. One end of the limiting spring... The upper and lower ends of the baffle plate abut against each other, 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 through hole. The rear chassis has lower rails at both ends, which are fixedly connected to the chassis frame. An upper rail is provided on the lower rails, which are also fixedly connected to the chassis frame. After the upper frame is lowered, the limit plates on both sides of the middle ladder are released from braking. Pulling down the limit handles moves the baffle plate downward, compressing the limit spring downward. The upper end of the baffle plate disengages from the limit slot of the limit plate. The lower ladder includes a first ladder and a second ladder. The second ladder is lifted upward. Rotate upwards around the hinge point with the first ladder until the second ladder is horizontal. Push the second ladder forward, and the second ladder pushes the first ladder forward. The first ladder rolls forward on the lower track of the rear chassis via rollers, so that the first and second ladders land on the rear chassis. The support wheel at the lower end of the second ladder overlaps and limits its position with the rear chassis, causing the front part of the middle ladder to fall downwards. The rear end of the middle ladder is equipped with rollers, and the front end of the middle ladder rotates downwards around the rollers until the middle ladder is horizontal. Push the middle ladder backwards, and the middle ladder slides on the upper track via rollers until the middle ladder lands on the lower ladder. After completion, the ladder body is retracted.

[0023] Due to the above-mentioned structure, the present invention has the advantages of novel structure, hook connection, can be disassembled into two modules when not in use, small space occupation, convenient transportation, low cost, stable support with limited position, detachable side panel, and foldable platform. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the present invention from one angle.

[0025] Figure 2This is a structural schematic diagram of the present invention from another angle.

[0026] Figure 3 This is a structural schematic diagram of the present invention from another angle.

[0027] Figure 4 This is the front view of the present invention.

[0028] Figure 5 This is a schematic diagram of the structure on the front chassis after the present invention has been disassembled.

[0029] Figure 6 This is a schematic diagram of the structure on the rear chassis after the present invention has been disassembled.

[0030] Figure 7 This is an enlarged schematic diagram of the docking platform of the present invention.

[0031] Figure 8 This is a schematic diagram of the platform framework of the present invention.

[0032] Figure 9 This is a side view of the platform framework of the present invention.

[0033] Figure 10 This is a schematic diagram of the folded structure of the platform frame of the present invention.

[0034] Figure 11 This is an enlarged schematic diagram of the docking platform in this invention with one side of the platform removed.

[0035] Figure 12 This is an enlarged schematic diagram of the connecting card plate of the present invention.

[0036] Figure 13 This is an enlarged schematic diagram of the side guide mechanism of the platform of the present invention.

[0037] Figure 14 This is an enlarged schematic diagram of the inner guide seat and the outer guide seat of the present invention.

[0038] Figure 15 This is an exploded view of the inner guide seat and the outer guide seat of the present invention.

[0039] Figure 16 This is an enlarged schematic diagram of the ladder lifting mechanism and the retraction support mechanism of the present invention.

[0040] Figure 17 This is the present invention. Figure 16 A schematic diagram of the shrunken structure.

[0041] Figure 18 This is a schematic diagram showing the state of the retractable support mechanism extending along with the ladder lifting mechanism in this invention.

[0042] Figure 19 This is an enlarged schematic diagram of the simply supported beam assembly in this invention.

[0043] Figure 20 This is an enlarged schematic diagram of the supporting locking mechanism and the pawl clamping mechanism in this invention. Figure 21 This is a schematic diagram of the pawl clamping mechanism of the present invention with the pawl shaft connecting plate removed on one side.

[0044] Figure 22 This is an enlarged schematic diagram of the automatic height measuring mechanism for ladders according to the present invention.

[0045] Figure 23 This is an enlarged schematic diagram of the automatic height measurement mechanism of the present invention.

[0046] Figure 24 This is an enlarged schematic diagram of one angle of the quick connection mechanism for the ladder side of the present invention.

[0047] Figure 25 This is an enlarged schematic diagram of the quick-connect mechanism for the ladder side of the present invention from another angle.

[0048] Figure 26 This is an enlarged schematic diagram of the ladder limiting connection mechanism of the present invention.

[0049] Figure 27 This is a schematic diagram of the ladder limit connection mechanism of the present invention in the state of being released from the limit.

[0050] Figure 28 This is the present invention. Figure 4 Enlarged view of section A.

[0051] Figure 29 This is the present invention. Figure 4 Enlarged view of the middle ladder limit connection mechanism.

[0052] Reference numerals: 1. Chassis; 2. Ladder; 3. Docking platform; 4. Upper ladder; 5. Middle ladder; 6. Lower ladder; 7. Front chassis; 8. Rear chassis; 9. Ladder lifting mechanism; 10. Upper frame; 11. Hook pin; 12. Upper ladder adjusting drive cylinder; 13. Platform support rod; 14. Rear connecting seat; 15. Front connecting seat; 16. Lower rail; 17. Upper rail; 18. Hook; 19. Support wheel; 20. Platform frame; 21. Platform side; 22. Platform side connecting mechanism; 23. Platform roller; 24. Connecting plate; 25. Pressing spring; 26. Platform guide rail; 27. Limiting connecting plate; 28. Locking block; 29. ​​Limiting block; 30. Platform side guide mechanism; 31. Side pillar, 32. Inner guide seat, 33. Inner roller, 34. Outer guide seat, 35. Outer roller, 36. Guide pin, 37. Guide rod, 38. Ladder limiting connection mechanism, 39. Limiting plate, 40. Ladder limiting fixing seat, 41. Baffle, 42. Limiting spring, 43. Limiting handle, 44. Limiting slot, 45. First ladder, 46. Second ladder, 47. Upper baffle, 48. Lower baffle, 49. Platform foldable connection 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 step, 59. Flipping connection... 60. Connecting block; 61. Flip pin; 62. Platform folding limit mechanism; 63. Platform limit shaft; 64. Platform limit hook; 65. Hook pin; 66. Torsion spring; 67. Ladder side panel; 68. Ladder side panel quick connection mechanism; 69. Side panel connecting frame; 70. Locking screw; 71. Insertion post; 72. Side panel slot; 73. Insertion hole; 74. Simply supported beam assembly; 75. Lifting drive cylinder; 76. Outer lower simply supported beam; 77. Inner lower simply supported beam; 78. Outer upper simply supported beam; 79. Inner upper simply supported beam; 80. Connecting beam; 81. Retraction support mechanism; 82. Front retraction rod; 83. Retraction rod; 84. Front guide limit roller; 85. Front locking pin; 86. Front locking plate. Rear guide limit roller 87, plug-in rod 88, rear clamping 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, sensor frame 96, sensor plate 97, sensor 98, sensor hole 99, ladder automatic height measuring mechanism 100, support locking mechanism 101, teeth 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, elongated hole 112. Detailed Implementation

[0053] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0054] An airplane boarding ladder includes a chassis 1 and a ladder body 2. A docking platform 3 is installed at the front end of the ladder body 2. The ladder body 2 comprises an upper ladder 4, a middle ladder 5, and a lower ladder 6. The chassis 1 comprises 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. Hook pins 11 are provided on the left and right sides of the rear end of the upper frame 10. Both ends of the hook pins 11 are fixedly connected to the upper frame 10. An upper ladder adjustment drive 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 via the upper ladder adjustment drive cylinder 12. 2 is connected to the upper frame 10, and the upper ladder is driven by the upper ladder adjustment drive cylinder. When not in use, the upper ladder adjustment drive cylinder retracts, and the upper ladder rests on the upper frame. The upper frame is driven by the upper ladder adjustment drive 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 via the support pin, the support pin hole, and the platform pin hole, and the rear end is hinged to the upper ladder 4 to facilitate the removal of the support pin. This allows the docking platform to rotate around the hinge point between the docking platform and the upper ladder for easy storage. The front end of the rear chassis 8 is fixedly provided with a rear connecting seat 14. A front connecting seat 15 is fixedly provided at the rear end of the frame of the front chassis 7. The rear connecting seat 14 and the front connecting seat 15 are respectively provided with pin holes. A connecting pin passes through the pin holes. The rear chassis 8 is fixedly connected to the front chassis 7 via the connecting pin and the pin holes, allowing for easy removal of the connecting pin to separate the front and rear chassis. Inserting the connecting pin fixes the front and rear chassis. The rear chassis 8 has lower rails 16 at both ends, located on the frame of the rear chassis 8 and fixedly connected to the frame. An upper rail 17 is provided on the lower rails 16 and fixedly connected to the frame of the rear chassis 8. The upper end of the intermediate ladder 5 has hooks 18 on both sides, with the upper end of each hook connected to a hook pin 11. The intermediate ladder 5 is fixedly connected to the lower end of the hook 18. Rollers are installed on both sides of the lower end of the intermediate ladder 5, and the lower end of the intermediate ladder 5 is movably connected to the upper rail 17 of the rear chassis 8 via the rollers. Rollers are installed on both sides of 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 via the rollers. Support wheels 19 are installed on both sides of the lower end of the lower ladder 6. When not in use, the ladder lifting mechanism moves the upper ladder downwards and retracts it above the front chassis. The upper ladder lifting mechanism moves the upper frame downwards, and the hook pin of the upper frame disengages downwards from the hook. The intermediate ladder slides downwards and retracts into the upper rail of the rear chassis. The lower ladder can be retracted upwards into the lower rail of the rear chassis. The connecting pin is then removed, and the front and rear chassis separate.Easy to assemble, disassemble, and transport.

[0055] 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 connecting mechanism 22 is provided on the platform frame 20. The platform sidewall connecting mechanism 22 includes platform rollers 23, connecting plates 24, pressing springs 25, platform guide rails 26, and limiting connecting plates 27. Platform rollers 23 are provided from front to back on the left side of the platform frame 20, and platform rollers 23 are provided from front to back on the right side of the platform frame 20. The platform rollers 23 are mounted on a platform shaft via bearings, and the platform shaft is fixed to the platform frame 20. Connecting plates 24 are provided on the left and right sides of the platform frame 20. One end of the connecting plate 24 is fixedly connected to the platform frame 20 via a pressing spring 25, and the other end extends outward and downward to form a locking block 28. A platform is provided at the lower end of the platform sidewalls 21. The platform guide rail 26 is fixedly connected to the platform side 21 and cooperates with the platform roller 23. The platform side 21 is slidably connected to the platform frame 20 via the platform guide rail 26 and the platform roller 23, so that the platform side is installed on the platform frame through the platform guide rail and the platform roller. The platform guide rail 26 is provided with a limiting connecting plate 27. One side of the limiting connecting plate 27 is fixedly connected to the platform side 21, and the other side is provided with limiting blocks 29 spaced from front to back. The locking block 28 is inserted between adjacent limiting blocks 29 to fix the platform side 21 to the platform frame 20. By stepping on the connecting plate and squeezing the spring, the locking block is lifted, and the platform side is slid into the platform frame. When the connecting plate is released, the spring rebounds, and the locking block is locked between adjacent limiting blocks, fixing the position of the platform side relative to the platform frame.

[0056] The platform frame 20 of the present invention is provided with a platform side guide mechanism 30. The platform side guide mechanism 30 includes a side column 31, an inner guide seat 32, an inner roller 33, an outer guide seat 34, an outer roller 35, and a guide pin 36. A side column 31 is provided on the inner side of the platform side 21. A guide rod 37 is provided at the lower end of the side column 31. A threaded hole is provided at the lower end of the side column 31. A guide groove is provided on the platform frame 20. The upper end of the guide rod 37 is fixedly connected to the side column 31, and the lower end is inserted into the guide groove. The side column 31 is threadedly connected to the platform frame 20 with screws to facilitate the assembly and disassembly of the side column. An inner guide seat 32 is provided on the side column 31. One side of the inner guide seat 32 is fixedly connected to the side column 31, and the other side is provided with a connecting slot. Inner rollers 33 are provided on the front and rear sides of the connecting slot. The connecting slot is provided with a slot pin hole. The inner roller 33 is mounted on the inner roller shaft. The upper and lower ends of the inner roller shaft are fixedly connected to the inner guide seat 32. The outer guide seat 34 is provided with a rod 38 and an outer roller 35. The upper end of the rod 38 is fixedly connected to the outer guide seat 34. The rod 38 is hollow and has a rod pin hole. The rod 38 is inserted into the connecting slot. The guide pin 36 passes through the slot pin hole and the rod pin hole to fix the rod 38 to the inner guide seat 32. The outer roller 35 is spaced apart from the inner roller 33. One side of the platform side 21 abuts against the inner roller 33 and the other side abuts against the outer roller 35. The outer roller 35 is sleeved on the outer roller shaft. The upper and lower ends of the outer roller shaft are fixedly connected to the outer guide seat 34 to guide the back and forth movement of the platform side through the inner roller and the outer roller.

[0057] The present invention provides a ladder limiting connection mechanism 39 between the intermediate ladder 5 and the lower ladder 6. The ladder limiting connection mechanism 39 includes a limiting plate 40, a ladder limiting fixing seat 41, a baffle 42, a limiting spring 43, and a limiting handle 44. Limiting plates 40 are respectively provided on both sides of the lower rear end of the intermediate ladder 5, and the limiting plates 40 are fixedly connected to the intermediate ladder 5. A limiting slot 45 is provided at the lower end of the limiting 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, and the first ladder 46 connects to the lower track 1 of the rear chassis 8 via the rollers. 6. A sliding connection is provided, wherein 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 mated with the middle ladder 5, and support wheels 19 are installed on both sides of the lower end of the second ladder 47. Ladder limiting fixing seats 41 are provided on both sides of the front end of the first ladder 46, and the ladder limiting fixing seats 41 are fixedly connected to the first ladder 46. The ladder limiting fixing seats 41 are provided with limiting through holes, and baffles 42 are inserted through the limiting through holes. Limiting springs 43 are provided within the limiting through holes. The baffles 42 include an upper baffle section 48 and a lower baffle section 49. The upper baffle section 48... The first ladder 46 and the intermediate ladder 5 are fixed in front and rear positions by inserting the end into the limiting slot 45. The lower end of the upper section 48 of the baffle plate is fixedly connected to the lower section 49 of the baffle plate. The outer diameter of the upper section 48 of the baffle plate is larger than the outer diameter of the lower section 49 of the baffle plate. The lower end of the lower section 49 of the baffle plate has a limiting handle 44 through the limiting hole. The lower section 49 of the baffle plate is fixedly connected to the limiting handle 44. The limiting spring 43 is sleeved on the lower section 49 of the baffle plate. One end of the limiting spring 43 abuts against the lower end face of the upper end of the baffle plate 42, and the other end abuts against the ladder limiting fixing seat 41. The outer end of the limiting handle 44 is fixedly connected to the lower end of the baffle plate 42. The diameter is larger than the inner diameter of the limiting perforation, so that when the lower ladder needs to be retracted, the limiting handle is manually pulled down to compress the limiting spring. The upper part of the upper section of the baffle plate disengages from the limiting slot. Then, the second ladder is lifted and rotated upward around its hinge point with the first ladder. After it reaches a horizontal position, the second ladder is pushed forward. The first ladder drives the second ladder forward along the lower track to retract the entire lower ladder. When the lower ladder needs to be unfolded, the second ladder is pulled backward and then rotated downward. The upper part of the upper section of the baffle plate at the front end of the first ladder enters the limiting slot, realizing the automatic limiting of the first ladder and the intermediate ladder.

[0058] The limiting plate 40 of the present invention extends downward and backward to form a guide surface, so as to facilitate the upper part of the baffle plate to automatically slide into the limiting slot along the guide surface.

[0059] The platform frame 20 of the present invention is provided with a foldable platform connection mechanism 50. The foldable platform connection mechanism 50 includes a front hinge block 51, a hinge connecting plate 52, a front connecting block 53, a rear hinge block 54, a rear connecting block 55, and a connecting pin 56. The platform frame 20 includes a front platform section 57 and a rear platform section 58. The rear end of the front platform section 57 is provided with 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. The front hinge block 51 is provided with hinge connecting plates 52 on both sides. The lower end of the front hinge block 51 is provided with a front connecting block 53, which is fixedly connected to the front hinge block 51. The rear end of the front connecting block 53 extends rearward and is provided with a front connecting pin hole. The rear platform section 58... The platform has a rear hinge block 54 at the front end, with a hinge shaft hole at the front end and a fixed connection at the rear end to the rear section 58 of the platform. The platform has a rear connecting block 55 at the lower end, which is fixedly connected to the rear hinge block 54. The rear connecting block 55 has a rear connecting pin hole extending forward at the front end. 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 connecting block 53 and the front end of the rear connecting block 55 are opposite each other. The front connecting block 53 and the rear connecting block 55 are fixedly connected via a connecting pin 56, a front connecting pin hole, and a rear connecting pin hole to facilitate the removal of the connecting pin. 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.

[0060] A flip pedal 59 is provided between the front section 57 and the rear section 58 of the platform described in this invention. The front end face of the flip pedal 59 abuts against the rear end face of the front section 57, and the rear end face abuts against the front end face of the rear section 58. The rear end of the flip pedal 59 is hinged to the rear section 58. A flip connecting block 60 is provided on the lower end face of the flip pedal 59. The flip connecting block 60 is fixedly connected to the flip pedal 59. A flip pin hole is provided on the flip connecting block 60. A flip connecting pin hole is provided on the rear end face of the front section 57. A flip pin 61 passes through the flip pin hole and the flip connecting pin hole to fix the flip connecting block 60 to the front section 57, thereby fixing the flip pedal between the front section and the rear section of the platform. When the front section and the rear section of the platform need to be folded, the flip pin is pulled out, the flip pedal is folded backward and placed on the rear section of the platform, and then the front section of the platform is folded backward and placed on the rear section of the platform.

[0061] The present invention provides a platform folding limiting mechanism 62 between the front section 57 and the rear section 58 of the platform. The platform folding limiting mechanism 62 includes a platform limiting shaft 63, a platform limiting hook 64, a hook pin 65, and a torsion spring 66. The platform limiting shaft 63 is provided on at least one side of the front section 57 and is fixedly connected to the front section 57. The platform limiting hook 64 is provided on at least one side of the rear section 58 and is hinged to the rear section 58 via the hook pin 65. The torsion spring 66 is sleeved on the hook pin 65 and the platform limiting hook 64 is limited to the rear section 58 via the torsion spring 66, so that the hook end of the platform limiting 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 limiting hook 64 hooks the platform limiting shaft 63 to limit and connect the front section 57 and the rear section 58 of the platform.

[0062] The present invention provides ladder side flanks 67 on both sides of the upper ladder 4, the middle ladder 5, and the second ladder 47. A quick-connect mechanism 68 is provided at the lower end of each ladder side flank 67. The quick-connect mechanism 68 includes a side flank connecting bracket 69, a locking screw 70, and a plug-in post 71. The upper ladder 4, the middle ladder 5, and the second ladder 47 are all fixedly provided with side flank connecting brackets 69. Each side flank connecting bracket 69 has a side flank slot 72 at its upper end and plug-in holes 73 spaced apart on its upper end. Each plug-in hole 73 has a locking hole on its side, which communicates with the plug-in hole 73. A locking screw 70 is located within the locking hole. The lower end of the ladder side 67 is provided with insertion posts 71 at intervals. The upper end of the insertion post 71 is fixedly connected to the ladder side 67. The outer diameter of the upper end of the insertion post 71 matches the inner diameter of the insertion hole 73. The outer diameter of the upper part of the insertion post 71 is larger than the outer diameter of the lower part of the insertion post 71. The lower end of the ladder side 67 is inserted into the side hull groove 72. The insertion post 71 is inserted into the insertion hole 73. The locking screw 70 passes through the locking hole and abuts against the insertion post 71. The locking screw 70 is threadedly connected to the side hull connecting bracket 69 to fix the ladder side 67 to the side hull connecting bracket 69. By rotating the locking screw, the locking screw abuts against the insertion post, fixing the ladder side hull to the side hull connecting bracket. By unscrewing the locking screw and pulling out the ladder side hull, the insertion post disengages from the insertion hole, thus separating the ladder side hull from the side hull connecting bracket.

[0063] The ladder lifting mechanism 9 of the present invention includes a simple beam assembly 74 and a lifting drive cylinder 75. The simple beam assemblies 74 are symmetrically arranged on both sides of the front chassis 7. The simple beam assembly 74 includes an outer lower simple beam 76, an inner lower simple beam 77, an outer upper simple beam 78, and an inner upper simple beam 79. Lifting guide rails are fixedly arranged on both sides of the frame of the front chassis 7. The outer lower simple beams 76 are arranged on both sides of the front part of the frame of the front chassis 7, and the inner lower simple beams 77 are arranged on both sides of the rear part of the front chassis 7. The lower end of the outer lower simply supported beam 76 is equipped with a roller. The outer lower simply supported beam 76 is slidably connected to the front chassis 7 via 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 upper end of the outer lower simply supported beam 76 is provided with an outer upper simply supported beam 78. The lower end of the inner lower simply supported beam 77 is hinged to the front chassis 7, and the upper end of the inner upper simply supported beam 79 is provided with an inner upper simply supported beam 79. 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 beam 78 is hinged to the inner upper simply supported beam 79 on the same side. A roller is provided 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 fixed on both sides of the upper frame 10. The outer upper simply supported beam 78 is slidably connected to the upper frame 10 via the roller and frame guide rails. A connecting beam 80 connects the two outer lower simply supported beams 76 on both sides of the front chassis 7. The two inner lower simply supported beams 76... A connecting beam 80 is connected between the two outer upper simply supported beams 78 and between the two inner upper simply supported beams 79, so as to realize the synchronous lifting and lowering of the two sets of simply supported beams. A lifting drive cylinder 75 is provided 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, so as to facilitate the lifting and lowering of the simply supported beam group by driving the lifting drive cylinder.

[0064] The present invention provides a retraction support mechanism 81 between the front chassis 7 and the upper frame 10. The retraction support mechanism 81 includes a front retraction rod 82, a rear retraction rod 83, a front guide limiting roller 84, a front locking pin 85, a front clamping plate 86, a rear guide limiting roller 87, a rear locking pin, a rear clamping plate 89, a connecting rod 88, and a positioning pin 90. The front retraction rods 82 are respectively provided on both sides of the front end of the upper frame 10, and the rear retraction rods 83 are respectively provided on both sides of the rear end of the upper frame 10. The front guide limiting roller 84 is provided on the inner upper simply supported beam 79 on the same side as the front retraction rod 82. The front retraction 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. 1. The front upper support rod 91 is slidably connected to the front lower support rod 92. The lower part of the front upper support rod 91 is provided with a front upper pin hole, and the upper part of the front lower support rod 92 is provided with a front lower pin hole. The lower end of the front lower support rod 92 is provided with a connecting groove. The front upper support rod 91 is fixedly connected to the front lower support rod 92 via a front locking pin 85, a front upper pin hole, and a front lower pin hole. So that after the front upper support rod rises with the upper frame, after the front upper support rod is pulled out from the front lower support rod into place, the positions of the front upper support rod and the front lower support rod are fixed by the front locking pin. The side wall of the front lower support rod 92 is provided with a front clamping plate 86, which is fixedly connected to the front lower support rod 92. The front clamping plate 86 is provided with a clamping groove, and the front guide limiting roller 84 is placed in the clamping groove of the front clamping plate 86. 84 abuts against the front plate 86, limiting the front lower support rod 92 on the inner upper simply supported beam 79. A rear guide limiting roller 87 is provided on the outer lower simply supported beam 76 on the same side as 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 and the rear lower support rod 94 are slidably connected. The lower part of the rear upper support rod 93 has a rear upper pin hole, and the upper part of the rear lower support rod 94 has a rear lower pin hole. The lower end of the rear lower support rod 94 has a connecting groove. The rear upper support rod 93 is fixedly connected to the rear lower support rod 94 via a rear locking pin, a rear upper pin hole, and a rear lower pin hole, so that when the rear upper support rod rises with the upper frame, the rear upper support rod... After the strut is pulled out of the lower rear support rod, the positions of the upper rear support rod and the lower rear support rod are fixed by the rear locking pin. The lower rear support rod 94 has a rear retaining plate 89 on its side wall. The rear retaining plate 89 is fixedly connected to the lower rear support rod 94. The rear retaining plate 89 has a clamping groove. The rear guide limiting roller 87 is placed in the clamping groove of the rear retaining plate 89. The rear guide limiting roller 87 abuts against the rear retaining plate 89 to limit the lower rear support rod 94 on the outer lower simple support beam 76. The connecting groove has a connecting pin hole. The front and rear sides of the front chassis 7 frame are respectively provided with plug-in rods 88. The lower end of the plug-in rod 88 is fixedly connected to the front chassis 7 frame. The plug-in rod 88 has a positioning pin hole. The plug-in rod 88 is inserted into the connecting groove.The positioning pin 90 passes through the connecting pin hole and the positioning pin hole to fix the front lower support rod or the rear lower support rod to the plug-in rod 88. When the ladder lifting mechanism raises the upper frame, the front lower support rod is removed from the front guide limit roller, and its lower end is inserted into the plug-in rod 88. The front lower support rod and the front upper support rod are locked together by the front locking pin, thus allowing the front upper support rod and the front lower support rod to support the upper frame. Similarly, the rear upper support rod and the rear lower support rod support the upper frame.

[0065] The hinge point between the front upper support rod 91 and the upper frame 10 is higher than the hinge point between the rear upper support rod 93 and the upper frame 10, so that when the rod is folded up, the front retractable rod is placed on top of the rear retractable rod.

[0066] The ladder lifting mechanism 9 of the present invention is provided with an automatic frame height measuring mechanism 95. The automatic frame height measuring mechanism 95 includes a sensing frame 96, a sensing plate 97, and a sensor 98. The sensing frame 96 is provided between the inner upper simply supported beam 79 and the inner lower simply supported beam 77. The sensing frame 96 is provided with a sensing groove. The upper end of the sensing plate 97 is hinged to the inner upper simply supported beam 79. The sensing plate 97 is placed in the sensing groove and slidably connected to the sensing frame 96. The sensing plate 97 is provided with sensing holes 99 at intervals along the sliding direction of the sensing plate 97. The upper end of the sensing groove is provided with a sensor 98, and the lower end is hinged to the inner lower simply supported beam 77. The sensor 98 is fixedly connected to the sensing frame 96. The sensor 98 cooperates with the sensing holes 99 to sense the number of sensing holes to read the length of the extended sensing plate.

[0067] The present invention provides an automatic height measuring mechanism 100 between the upper frame 10 and the upper ladder 4. The automatic height measuring mechanism 100 includes a sensing frame, a sensing plate, and a sensor. The upper frame is provided with a sensing frame, and the sensing frame is provided with a sensing groove. The sensing plate is provided in the sensing groove. The lower end of the sensing frame is hinged to the upper frame. The sensing plate is slidably connected to the sensing frame. The upper end of the sensing plate is hinged to the upper ladder. The sensing plate is provided with sensing holes spaced apart along the sliding direction of the sensing plate. The upper end of the sensing groove is provided with a sensor. The sensor is fixedly connected to the sensing frame. The sensor cooperates with the sensing holes to sense the number of sensing holes to read the length of the extended sensing plate.

[0068] The ladder-adjusting drive cylinder 12 of the present invention is provided with a support and locking mechanism 101. The support and locking mechanism 101 includes teeth 102, a pawl drive cylinder 103, and a pawl 104. Teeth 102 are fixedly provided on the wall of the telescopic rod of the ladder-adjusting drive cylinder 12. A pawl drive cylinder 103 is provided on the cylinder seat of the 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 teeth 102 to lock the position of the telescopic rod of the ladder-adjusting drive cylinder 12, so as to prevent the telescopic rod of the ladder-adjusting drive cylinder from sliding when supporting the ladder.

[0069] The pawl drive cylinder 103 of the present invention is provided with a pawl clamping mechanism 105. The pawl clamping mechanism 105 includes a clamping adjustment plate 106, a first pin 107, a second pin 108, a clamping spring 109, a pawl shaft connecting plate 110, and a pawl shaft 111. The pawl drive cylinder 103 has a clamping adjustment plate 106 on its telescopic rod. One end of the clamping adjustment plate 106 has the first pin 107, and the other end has the second pin 108. Clamping springs 109 are provided on both sides of the clamping adjustment plate 106. One end of the clamping adjustment plate 106 has a shaft hole, and the other end has an elongated hole 112. The clamping adjustment plate 106 is hinged to the telescopic rod of the pawl drive cylinder 103 via the first pin 107. The second pin 108 passes through the elongated hole 112. Both ends of the second pin 108 are provided with pawl shaft connecting plates 110. One end of the pawl shaft connecting plate 110 is fixedly connected to the second pin 108, and the other end is fixedly connected to the pawl shaft 111. The pawl 104 is fixedly mounted on the pawl shaft 111. One end of the clamping spring 109 is connected to the first pin 107, and the other end is connected to the second pin 108, so as to facilitate the extension of the extension rod of the pawl drive cylinder. The front end of the clamping adjustment plate drives the pawl shaft to rotate. The pawl shaft drives the pawl to mesh with the teeth. The clamping spring is compressed. The front end of the clamping adjustment plate has an elongated hole, so that after the clamping spring is compressed, it drives the second pin shaft to rotate with the teeth, so that the pawl and the teeth are in close contact.

[0070] The platform support rod 13 of the present invention has a retractable pin hole between its two ends, so that after the support pin is lowered, the docking platform can be rotated downward and stored in the front side of the front chassis. At this time, the support pin can be inserted into the retractable pin hole and the platform pin hole to fix the docking platform to the upper ladder, thus avoiding the docking platform from shaking during transportation.

[0071] As attached Figure 1 - Appendix Figure 27The front end of the chassis 7 can be moved by a tractor or manually, depending on the requirements. This invention can have a control system installed on the chassis 1, such as a PLC control system. The ladder adjustment drive cylinder 12, lifting drive cylinder 75, sensor 98, sensor of the automatic height measuring mechanism 100 of the ladder 4, support locking mechanism 101, and pawl drive cylinder 103 are all connected to the control system. A display screen or control switch can also be installed, connected to the control system. The display screen or control switch has control buttons for the aforementioned drive cylinders or sensors. When in use, the display screen or control switch can be manually lifted for convenient manual control by the operator. When not in use, the display screen or control switch can be placed on the chassis 1. This invention has two states, one as shown in the attached diagram. Figure 1 -Appendix Figure 4 The operational state includes the fully deployed state after the front and rear ladder modules are docked with the aircraft, and another state is shown in the attached figure. Figure 5 and attached Figure 6 The folded state when not in use, that is, the state after the front and rear ladder modules have been disassembled and reassembled individually, ready for transport. The conversion method between the two states is explained in detail below: (See attached image) Figure 1 -Appendix Figure 4 In use, the docking platform 3 is driven to dock with the aircraft. When the invention is no longer in use and needs to be retracted: Step 1: Remove the platform side 21: Taking the platform side 21 on one side of the platform frame 20 as an example, first remove the platform side guide mechanism 30, as shown in the attached... Figure 13-15 Remove the guide pin 36, remove the outer guide seat 34, then remove the screws at the lower end of the side column 31, and remove the side column 31 from the platform frame 20. Next, as shown in the attached... Figure 11 -Appendix Figure 12 The operator steps on the connecting plate 24, causing the locking block 28 to disengage from the limiting block 29. Then, the operator manually pulls forward the platform side 21. Similarly, the platform side 21 on the other side of the platform frame 20 is removed. Step 2: Remove the ladder side 67: as shown in the attached figure. Figure 1 -Appendix Figure 4 Appendix Figure 24 and attached Figure 25 Taking the side 67 of the upper ladder 4 as an example, loosen the locking screws 70 one by one to separate the locking screws 70 from the plug 71, and then manually pull up the side 67 of the upper ladder 4. Similarly, remove the side 67 of the upper ladder 4 on the other side, the side 67 of the middle ladder 5 on both sides, and the side 67 of the second ladder 47 on both sides; Step 3: Retract the retractable support mechanism 81: as shown in the attached Figure 16 -Appendix Figure 19Remove the positioning pins 90 connecting the lower ends of the front retractable rod 82 and the rear retractable rod 83 of the retractable support mechanism 81 to the front chassis 7. Then, remove 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 upwards and rotate the front lower support rod 92 backwards so that the front locking plate 86 of the front lower support rod 92 is locked on the front guide limiting roller 84. Then, retract the rear lower support rod 94 of the rear retractable rod 83 upwards and rotate the rear lower support rod 94 forward so that the rear locking plate 89 of the rear lower support rod 94 is locked on the rear guide limiting roller 87. In this invention, the front chassis 7 is provided with two front retractable rods 82 and two rear retractable rods 83. Place the front retractable rods 82 and the rear retractable rods 83 according to the above steps. Step 4: Retract the upper ladder 4: Start the lifting drive cylinder 75, as shown in the attached figure. Figure 16 In this embodiment, two sets of simply supported beams 74 are provided on the front chassis 7, and two corresponding lifting drive cylinders 75 are also provided, corresponding one-to-one with the simply supported beams 74. The upper ladder 4 and 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 between the upper end of the front retractable rod 82 and the upper frame 10 and the front guide limit roller 84 becomes smaller and smaller, the front retractable rod 82 gradually retracts, and the front upper support rod 91 gradually enters the front lower support rod 92, and the front retractable rod 82 gradually retracts. The release rod 82 swings backward until the front retracting rod 82 is horizontal. Similarly, the distance between the rear retracting rod 83 and the rear guide limit roller 87 also decreases. The rear retracting rod 83 swings forward and gradually becomes horizontal. The rear retracting rod 83 retracts, and the rear upper support rod 93 gradually enters the rear lower support rod 94. Because the hinge point between the rear retracting rod 83 and the upper frame 10 is lower than the hinge point between the front retracting rod 83 and the upper frame 10, the rear retracting rod 83 is located below the front retracting rod 82. The simply supported beam assembly 74 descends to its lowest point, as shown in the attached diagram. Figure 17 Automatic retraction of the front and rear retraction levers 82 and 83 is achieved, and the lifting drive cylinder 75 is deactivated, as shown in the attached diagram. Figure 4 and attached Figure 28 During the descent of the upper frame 10, the upper frame 10, along with its hook pin 11, falls. The hook pin 11 disengages from the hook 18, thus separating the upper ladder 4 from the middle ladder 5. Step 5: Separate the front chassis 7 and the rear chassis 8; Remove the connecting pin between the front connecting seat 15 of the front chassis 7 and the rear connecting seat 14 of the rear chassis 8, separating the front connecting seat 15 and the rear connecting seat 14, thus separating the front chassis 7 and the rear chassis 8. Step 6: Release the brake of the upper ladder adjustment drive cylinder 12: Activate the pawl drive cylinder 103 of the support locking mechanism 101. The telescopic cylinder of the pawl drive cylinder 103 retracts, causing the pawl 104 to separate from the teeth 102, releasing the lock on the upper ladder adjustment drive cylinder 12. Activate the upper ladder adjustment drive cylinder 12. The telescopic rod of the upper ladder adjustment drive cylinder 12 retracts, and the front end of the upper ladder 4, along with the docking platform 3, falls, as shown in the attached diagram. Figure 5Step 7: Close the upper ladder adjustment drive cylinder 12; Step 8: Fold the platform frame 20 as shown in the attached document. Figure 7-9 Remove the flip pin 61 at the lower end of the flip pedal 59, rotate the flip pedal 59 backward so that the flip pedal 59 rests on the rear section 58 of the platform, remove the connecting pins 56 on the left and right sides of the platform frame 20, flip the front section 57 of the platform backward so that the rear section 58 of the platform rests on the flip pedal 59 and the rear section 58 of the platform, as shown in the attached diagram. Figure 10 Pull the hook end of the platform limiting hook 64 backward so that the hook end of the platform limiting hook 64 hooks the platform limiting shaft 63, thus limiting and fixing the positions of the front section 57 and the rear section 58 of the platform; Step 8: Bend the platform frame 20 downward and fix it: Remove the support pin connecting the front end of the platform support rod 13 to the docking platform 3. At this time, the platform frame 20 can rotate around the hinge point between it and the upper ladder 4. Align the retraction pin hole of the platform support rod 13 with the platform pin hole, insert the support pin into the retraction pin hole and the platform pin hole, and limit and fix the positions of the platform frame 20 and the upper ladder 4, as shown in the attached figure. Figure 5 As shown, to avoid shaking of the docking platform 3 during movement or transportation; Step 9: Retract the middle ladder 5 and the lower ladder 6: After the upper frame 10 is lowered, the operator manually holds the middle ladder 5, releases the brakes on the limiting plates 40 on both sides of the middle ladder 5, manually pulls down the limiting handles 44, causing the baffle 42 to move downwards, the baffle 42 compresses the limiting spring 43 downwards, and the upper end of the baffle 42 disengages from the limiting slot 45 of the limiting plate 40. The lower ladder 6 includes the first ladder 46 and the second ladder 47. The operator lifts the second ladder 47 upwards, with the hinge point between the second ladder 47 and the first ladder 46 as the center. Rotate the ladder upwards until the second ladder 47 is horizontal. Push the second ladder 47 forward, which in turn pushes the first ladder 46 forward. The first ladder 46 rolls forward on the lower track of the rear chassis 8 via rollers, causing the first ladder 46 and the second ladder 47 to land on the rear chassis 8. Then, the operator lowers the front of the middle ladder 5 downwards. The rear end of the middle ladder 5 is equipped with rollers that can rotate. The front end of the middle ladder 5 rotates downwards around the rollers until the middle ladder 5 is horizontal. Push the middle ladder 5 backwards, causing the rollers to slide and connect with the upper track 17, so that the middle ladder 5 lands above the lower ladder 6, as shown in the attached diagram. Figure 6 Complete the storage of the middle ladder 5 and the lower ladder 6; after the hook pin 11 and hook 18 are separated in step four or after the front chassis 7 and rear chassis 8 are separated in step five, if there are many operators, steps six and nine can be performed 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 can be disassembled, folded and assembled separately.

[0072] When needed, this invention will be provided by appendix. Figure 5 and attached Figure 6 The folded state is transformed into the attached diagram - Figure 4The steps for unfolding and using the platform frame 20 are as follows: Step 1: Rotate the platform frame 20 to a horizontal position: Pull the support pin at the front end of the platform support rod 13 out of the retractable pin hole and the platform pin hole. The platform frame 20 can then rotate upwards and forwards around its hinge point with the upper ladder 4. Rotate the platform frame 20 to a horizontal position so that the support pin hole at the front end of the platform support rod 13 aligns with the platform pin hole. Pass the support pin through the support pin hole and the platform pin hole, and horizontally fix the platform frame 20 to the front end of the upper ladder 4. Step 2: Unfold the platform frame 20, as shown in the attached diagram. 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, and 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 the attached figure. Figure 9 Insert the connecting pin 56, rotate the tilting pedal 59 upwards and forwards until the front part of the tilting pedal 59 abuts against the front part of the platform 57, and insert the tilting pin 61; Step 3: Install the platform side hull 21: Taking the side hull installation on one side of the platform frame 20 as an example, first install the platform side hull guide mechanism 30, as shown in the attached... Figure 13-15 Insert the guide rod at the lower end of the side column 31 into the guide groove of the platform frame 20, and fix the side column 31 to the platform frame 20 with screws. Fix the inner guide seat 32 to the side column 31 with screws. Insert the insertion rod 38 of the outer guide seat 34 into the connecting slot of the inner guide seat 32, insert the guide pin 36, and fix the inner guide seat 32 and the outer guide seat 34. Figure 11 and attached Figure 12 Press the connecting plate 24 to lift the locking block 28, pushing the platform side hull 21 from front to back. The platform guide rail 26 of the platform side hull 21 is fitted onto the platform roller 23. The upper end of the platform side hull 21 passes through the guide space between the inner roller 33 and the outer roller 35 until the platform side hull 21 moves into place, as shown in the attached figure. Figure 1-4 Appendix Figure 7As shown, stop pressing the connecting plate 24, so that the locking block 28 engages between the adjacent limiting blocks 29, and fix the platform side 21 to the platform frame 20. Similarly, install 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 of the front chassis 7 so that the front connecting seat 15 and the rear connecting seat 14 are opposite each other. Insert the connecting pin and limit the connection between the front connecting seat 15 and the rear connecting seat 14 to achieve the connection between the front chassis 7 and the rear chassis 8. Fifth step: Raise the ladder: Start the lifting drive cylinder 75, and the simply supported beam group 74 will rise accordingly, driving the upper frame 10 and 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 lever 82 and the upper frame 10 and the front guide limit roller 84 increases, and the front retractable lever 82 gradually extends. The front upper support rod 91 extends from the front lower support rod 92, and the front retractable lever 82 swings forward until it is nearly vertical. Similarly, the distance between the rear retractable lever 83 and the rear guide limit roller 87 also increases, and the rear retractable lever 83 swings backward until it is nearly vertical. The rear retractable lever 83 extends, and the rear upper support rod 93 extends from the rear lower support rod 94. The lifting drive cylinder 75 is closed, and the front retractable lever 82 is manually removed from the front guide limit roller 84 and pulled downward. Move the front lower support rod 92 so that its lower end engages with the connector rod 88 on the front side of the front chassis 7, insert the positioning pin 90, and simultaneously lock the front lower support rod 92 and the front upper support rod 91 together with the front locking pin 85. Manually remove the rear retractable rod 83 from the rear guide limit roller 87, and pull down the rear lower support rod 94 so that its lower end engages with the connector rod 88 on the rear side of the front chassis 7, insert the positioning pin 90, and simultaneously lock the rear lower support rod 93 and the rear lower support rod 94 together with the rear locking pin. Similarly, lower 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. Upper frame 1 As the ladder rises, the connecting pin 11 contacts the connecting hook 18 of the intermediate ladder 5, and the connecting hook 18 is hooked onto the connecting pin 11. The upper frame 10 raises the front end of the intermediate ladder 5. The front end of the intermediate ladder 5 rotates upward in the lower track 16 through the roller at the rear end of the intermediate ladder 5. The upper ladder adjustment drive cylinder 12 is activated to lift the docking platform 3 and the front end of the upper ladder 4. After the docking platform 3 is raised to the position, the upper ladder adjustment drive cylinder 12 is closed. Step 6: Locking the upper ladder adjustment drive cylinder 12: Activate the pawl drive cylinder 103. The extension rod of the pawl drive cylinder 103 extends, so that the pawl contacts the teeth 102, fixing the position of the extension rod of the upper ladder adjustment drive cylinder 12.Step 7: Unfolding the second ladder 47: Manually pull the second ladder 47 backward. The second ladder 47 will move the first ladder 46 horizontally backward. Then rotate the second ladder 47 downward around its hinge point with the first ladder 46 until the support wheel at the rear end of the second ladder 47 contacts the ground. At this time, the baffle 42 of the ladder limiting connection mechanism 39 at the front end of the first ladder 46 will automatically slide into the limiting slot 45 of the limiting plate 40, limiting and fixing the positions of the first ladder 46 and the second ladder 47. Step 8: Installing the ladder side 67: Taking the installation of the ladder side 67 on one side of the upper ladder 4 as an example, see attached. Figure 24 and attached Figure 25 Insert the side hull 67 of the ladder body into the side hull slot 72 of the side hull connecting bracket 69, insert the insertion post 71 at the lower end of the side hull 67 of the ladder body 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, and fix the side hull 67 of the ladder body to the side hull connecting bracket 69. Similarly, install the side hull 67 of the upper ladder 4 on the other side of the upper ladder 4, both sides of the middle ladder 5 and both sides of the second ladder 47; Ninth step: The lower ends of the front chassis 7 and the rear chassis 8 are equipped with tires, which can be manually towed or towed by a tow vehicle to pick up the machine.

[0073] This invention features a clever structure, employing a hook and pin hinge connection for quick and convenient connection. Compared to existing technologies, it avoids slippage and jamming. Furthermore, when not in use, it can be disassembled into two parts, each foldable and assembled independently, occupying minimal space and facilitating transportation and dragging, resulting in low transportation costs. If one part malfunctions, only that part can be replaced, further reducing operating costs. In this invention, the lower end of the upper ladder 4 mates with the upper end of the middle ladder 5, and the lower end of the middle ladder 5 mates with the upper end of the second ladder 47, forming the complete ladder body. The steps on the upper ladder 4, middle ladder 5, and second ladder 47 are continuous from top to bottom, so passengers do not need to adjust their steps when going up and down. To further improve the docking height of the boarding stairs, the upper rail 17 and lower rail 16 in this invention can be variable height rails. The upper rail 17 goes from high to low from front to back, and the lower rail goes from low to high from front to back. The rollers on both sides of the middle ladder 5 are located on the outer side of the middle ladder body, and the rollers on both sides of the first ladder 46 are located on the outer side of the first ladder body. When the middle ladder 5 rises, it moves from back to front, and its height increases with the upper rail. As the second ladder gradually rises and is pulled back along with the first ladder, the height of the front end of the second ladder gradually increases along the lower rail, ensuring that the front end of the second ladder aligns perfectly with the lower end of the middle ladder. When the middle ladder 5 and the lower ladder 6 are retracted, the method is as described above: the ladder bodies of the first ladder 46 and the second ladder 47 rest on the rear chassis frame, and the middle ladder 5 slides backward. The height of the middle ladder 5 decreases as the roller moves to the rear side of the lower rail 17, and the middle ladder 5 rests on the first ladder 46 and the second ladder 47. This invention sets a limit between the middle ladder 5 and the lower ladder 6 to prevent... The invention features a high level of safety, preventing issues such as swaying or movement of the lower ladder 6. The platform side panel 21 is easy to assemble and disassemble, and replacement is also very convenient. In case of problems, the side panel can be directly replaced without affecting the docking operation. Similarly, the ladder side panel 67 is also detachable and easy to install. Furthermore, the invention includes 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, ensuring stable support and high safety.

[0074] Due to the above-mentioned structure, the present invention has the advantages of novel structure, hook connection, can be disassembled into two modules when not in use, small space occupation, convenient transportation, low cost, stable support with limited position, detachable side panel, and foldable platform.

Claims

1. A method for assembling docking boarding equipment, characterized in that: The present invention includes a method for docking and assembling a front ladder module and a rear ladder module. The front ladder module includes a front chassis, a front ladder lifting support mechanism, and a front ladder body. The rear ladder module includes a rear chassis and a rear ladder body. The method for docking and assembling the front and rear ladder modules includes the following steps: Step 1: Move the rear chassis of the rear ladder module to the rear side of the front chassis of the front ladder module, and insert and fix the front chassis and the rear chassis. Step 2: Activate the front ladder lifting support mechanism to drive the front ladder to rise. As the upper frame of the front ladder lifting support mechanism rises, the hook pin at the rear end of the upper frame engages with the hook at the front end of the rear ladder. The upper frame then lifts the front end of the rear ladder, unfolding the front and rear ladders. The front chassis is equipped with a ladder-type lifting mechanism. The upper end of the ladder-type lifting mechanism has an upper frame. The lower end of the ladder-type lifting mechanism is connected to the front chassis, and the upper end is connected to the upper frame. The ladder-type lifting mechanism includes a simple-supported beam assembly and a lifting drive cylinder. The front chassis has symmetrically arranged simple-supported beam assemblies on both sides. Each simple-supported beam assembly 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. The front of the front chassis frame has outer lower simple-supported beams on both sides, and the rear of the front chassis has inner lower simple-supported beams on both sides. The upper end of each outer lower simple-supported beam has an outer upper simple-supported beam, and the upper end of each inner lower simple-supported beam has an inner upper simple-supported beam. A lifting drive cylinder is located between the inner upper and inner lower simple-supported beams. A retraction support mechanism is located between the front chassis and the upper frame. The retraction support mechanism includes a front retraction rod, a rear retraction rod, and a front guide limit roller. The system comprises wheels, a front retaining plate, a rear guide limiting roller, and a rear retaining plate. Front retractable rods are located on both sides of the front end of the upper frame, and rear retractable rods are located on both sides of the rear end of the upper frame. A front guide limiting roller is located on the inner upper simply supported beam on the same side as the front retractable rod. 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 and the front lower support rod are slidably connected. A front retaining plate is located on the side wall of the front lower support rod. A rear guide limiting roller is located on the outer lower simply supported beam on the same side as 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 and the rear lower support rod are slidably connected. A rear retaining plate is located on the side wall of the rear lower support rod. In the second step, the lifting drive cylinder is activated, the telescopic rod of the lifting drive cylinder extends, driving the upper frame to rise. The front upper support rod extends from the front lower support rod, and the front retractable rod swings downward and forward until it is nearly vertical. At the same time, the rear upper support rod extends from the rear lower support rod, and the rear retractable rod swings downward and backward until it is nearly vertical. The lifting drive cylinder is then deactivated. The front retaining plate of the front retractable rod is removed from the front guide limit roller. The front lower support rod of the front retractable rod is pulled downward, and its lower end is inserted and fixed to the front chassis. The front upper support rod and the front lower support rod are then locked and fixed. The rear retaining plate of the rear retractable rod is removed from the rear guide limit roller. The rear lower support rod is pulled downward, and its lower end is inserted and fixed to the front chassis. The rear upper support rod and the rear lower support rod are then locked and fixed.

2. The assembly method for docking boarding equipment according to claim 1, characterized in that: The front ladder includes an upper ladder with a docking platform at its front end. 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. The platform support rod has a support pin hole at its front end and a platform pin hole at its lower end. A retractable pin hole is provided between the two ends of the platform support rod. The docking platform includes a platform frame. After the first step, the support pin at the front end of the platform support rod is pulled out from the retractable pin hole and the platform pin hole. The platform frame of the docking platform rotates upward and forward around its hinge point with the upper ladder, rotating the platform frame to a horizontal position so that the support pin hole at the front end of the platform support rod corresponds to the platform pin hole. The support pin is passed through the support pin hole and the platform pin hole, and the platform frame is horizontally fixed to the front end of the upper ladder.

3. The assembly method for docking boarding equipment according to claim 2, characterized in that: The platform frame includes a front platform section and a rear platform section. The rear end of the front platform section has a front hinge block, the front end of which is fixedly connected to the front platform section. The lower end of the front hinge block has a front connecting block, which is fixedly connected to the front hinge block. The rear end of the front connecting block extends rearward and has a front connecting pin hole. The front end of the rear platform section has a rear hinge block, the lower end of which has a rear connecting block, which is fixedly connected to the rear hinge block. The front end of the rear connecting block extends forward and has a rear connecting pin hole. The rear ends of the front and rear connecting blocks are opposite each other. The front and rear connecting blocks are fixedly connected via connecting pins, the front connecting pin hole, and the rear connecting pin hole. A flip pedal is provided between the front and rear platform sections. The rear end of the flip pedal is hinged to the rear platform section. The lower end face of the flip pedal has a flip connecting block, which is fixedly connected to the flip pedal. The connecting block is provided with a flip pin hole, and the rear end face of the front section of the platform is provided with a flip connecting pin hole. The flip pin passes through the flip pin hole and the flip connecting pin hole to fix the flip connecting block to the front section of the platform. The front section of the platform is provided with a platform limiting shaft on at least one side, and the platform limiting shaft is fixedly connected to the front section of the platform. The rear section of the platform is provided with a platform limiting hook on at least one side, and the platform limiting hook is hinged to the rear section of the platform via a hook pin shaft. A torsion spring is sleeved on the hook pin shaft, and the platform limiting hook is limitedly connected to the rear section of the platform via the torsion spring. After the platform frame is rotated to a horizontal state and fixed, the platform frame is unfolded, and the hook end of the platform limiting hook is pulled backward so that the hook end of the platform limiting hook is away from the platform limiting shaft. The front section of the platform is rotated upward and forward until the front section of the platform is in a horizontal state. The connecting pin is inserted, and the flip pedal is rotated upward and forward until the front section of the flip pedal abuts against the front section of the platform. The flip pin is inserted.

4. The assembly method for docking boarding equipment according to claim 3, characterized in that: The platform frame has platform sidewalls on both the left and right sides. Platform rollers are located on the left side of the platform frame from front to back. Connecting plates are located on both sides of the platform frame. One end of each connecting plate is fixedly connected to the platform frame via a pressing spring, and the other end extends outward and downward to form a locking block. A platform guide rail is located at the lower end of each platform sidewall. A limiting connecting plate is located on the platform guide rail. One side of the limiting connecting plate is fixedly connected to the platform sidewall, and the other side has limiting blocks spaced from front to back. A platform sidewall guiding mechanism is located on the platform frame. The platform sidewall guiding mechanism includes a sidewall column, an inner guide seat, an inner roller, an outer guide seat, an outer roller, and a guide pin. A sidewall column is located on the inner side of the platform sidewall. A guide rod is located at the lower end of the sidewall column. A guide groove is located on the platform frame. The upper end of the guide rod is fixedly connected to the sidewall column, and the lower end is inserted into the guide groove. The sidewall column is threadedly connected to the platform frame with screws. An inner guide seat is located on the sidewall column. One side of the inner guide seat is fixedly connected to the sidewall column, and the other side has a connecting slot. The connecting slot has inner rollers on both the front and rear sides. The connecting slot has slot pin holes. The outer guide seat has a rod and an outer roller. The rod has a rod pin hole. The rod is inserted into the connecting slot, and the guide pin passes through the slot pin hole and the rod pin hole to fix the rod to the inner guide seat. After the platform frame is unfolded, the platform side is installed. First, the platform side guide mechanism is installed. The guide rod at the lower end of the side column is inserted into the guide groove of the platform frame. The side column is fixed to the platform frame with screws. The inner rollers are then installed... The guide seat is fixed to the side column with screws. The insert rod of the outer guide seat is inserted into the connecting slot of the inner guide seat. The guide pin is inserted to fix the inner guide seat and the outer guide seat. Press the connecting plate to make the locking block rise and push the platform side from front to back. The platform guide rail of the platform side is sleeved on the platform roller. The upper end of the platform side passes through the guide space between the inner roller and the outer roller until the platform side moves into place. Stop pressing the connecting plate so that the locking block is locked between the adjacent limiting blocks, and fix the platform side to the platform frame.

5. A method for assembling docking boarding equipment according to claim 1, 2, 3, or 4, characterized in that: The rear chassis has a rear connecting seat fixedly installed at the front end of the frame, and the front chassis has a front connecting seat fixedly installed at the rear end of the frame. The rear connecting seat and the front connecting seat are respectively provided with pin holes. In the first step, the rear connecting seat of the rear chassis is brought close to the front connecting seat of the front chassis, and the connecting pin is inserted to limit the connection between the front connecting seat and the rear connecting seat.

6. A method for assembling docking boarding equipment according to claim 2, 3, or 4, characterized in that: An upper ladder adjustment drive 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 via the upper ladder adjustment drive cylinder. After the second step, the upper ladder adjustment drive cylinder is activated, and the telescopic rod of the upper ladder adjustment drive cylinder extends to lift the docking platform and the front end of the upper ladder. After the docking platform rises to the position, the upper ladder adjustment drive cylinder is closed.

7. The assembly method for docking boarding equipment according to claim 6, characterized in that: The upper ladder adjustment drive cylinder is equipped with a support and locking mechanism, which includes teeth, a pawl drive cylinder, and a pawl. Teeth are fixedly provided on the wall of the telescopic rod of the upper ladder adjustment drive cylinder, and a pawl drive cylinder is provided on the cylinder seat of the upper ladder adjustment drive cylinder. A pawl is fixedly connected to the telescopic rod of the pawl drive cylinder. The pawl and teeth cooperate to lock the position of the telescopic rod of the upper ladder adjustment drive cylinder. After the docking platform rises to the position, the pawl drive cylinder is activated, and the telescopic rod of the pawl drive cylinder extends, so that the pawl contacts the teeth and fixes the position of the telescopic rod of the upper ladder adjustment drive cylinder.

8. A method for assembling docking boarding equipment according to claim 2, 3, 4, or 7, characterized in that: The rear ladder includes a middle ladder, a first ladder, and a second ladder. The middle ladder unfolds as the upper frame rises. Pulling the second ladder backward causes the first ladder to move horizontally backward. Then, the second ladder rotates downward around its hinge point with the first ladder until the support wheel at the rear of the second ladder contacts the ground. The front end of the second ladder then aligns with the middle ladder, thus unfolding the rear ladder. The rear chassis has lower rails at both ends, located on the chassis frame and fixedly connected to it. Upper rails are mounted on the lower rails and connect to the rear... The chassis frame is fixedly connected. The upper end of the middle ladder is provided with hooks on both sides. The upper end of the hooks is engaged with the hook pin and connected. The lower end of the hooks is fixedly connected to the middle ladder. Rollers are installed on both sides of the lower end of the middle ladder. The lower end of the middle ladder is movably connected to the upper rail of the rear chassis via the rollers. Rollers are installed on both sides of the first ladder. The first ladder is slidably connected to the lower rail of the rear chassis via the rollers. The rear end of the first ladder is hinged to the front end of the second ladder. The upper end of the second ladder is engaged with the middle ladder. Support wheels are installed on both sides of the lower end of the second ladder.

9. The assembly method for docking boarding equipment according to claim 8, characterized in that: The second ladder drives the first ladder to move horizontally backward. Before the second ladder rotates downward, the baffle of the ladder limiting connection mechanism at the front end of the first ladder automatically slides into the limiting slot of the limiting plate, limiting and fixing the positions of the intermediate ladder and the first ladder. The ladder limiting connection mechanism includes a limiting plate, a ladder limiting fixing seat, and a baffle. Limiting plates are respectively provided on both sides of the lower rear end of the intermediate ladder. The limiting plates are fixedly connected to the intermediate ladder. A limiting slot is provided at the lower end of the limiting plate. Ladder limiting fixing seats are provided on both sides of the front end of the first ladder. The ladder limiting fixing seats are fixedly connected to the first ladder. A limiting through hole is provided on the ladder limiting fixing seat, and a baffle passes through the limiting through hole.

10. The assembly method for docking boarding equipment according to claim 8, characterized in that: The upper ladder has side flanks on both sides, the middle ladder has side flanks on both sides, and the second ladder has side flanks on both sides. A quick-connect mechanism for the side flanks is provided at the lower end of each side flank. This quick-connect mechanism includes a side flank connecting frame, locking screws, and insertion pins. Side flank connecting frames are fixedly provided on both sides of the upper ladder, the middle ladder, and the second ladder. A side flank slot is provided at the upper end of each side flank connecting frame. Insertion holes are spaced apart on the side of each insertion hole, and locking holes are provided on the side of each insertion hole. Locking holes communicate with the insertion holes, and locking screws are provided inside the locking holes. Insertion pins are spaced apart at the lower end of each side flank, and the upper ends of these insertion pins are fixed to the side flanks of the ladder. The connection is as follows: the outer diameter of the upper end of the plug-in post matches the inner diameter of the plug-in hole; the outer diameter of the upper part of the plug-in post is larger than the outer diameter of the lower part of the plug-in post; the lower end of the ladder side is inserted into the side slot; the plug-in post is inserted into the plug-in hole; the locking screw passes through the locking hole and abuts against the plug-in post; the locking screw is threadedly connected to the side connecting frame to fix the ladder side to the side connecting frame; after the ladder is unfolded, ladder side panels are installed on both sides of the upper ladder, both sides of the middle ladder, and both sides of the second ladder; the ladder side panels are inserted into the side slots of the side connecting frame on one side of the upper ladder, middle ladder, or second ladder; the plug-in post at the lower end of the ladder side is inserted into the plug-in hole; the locking screw is rotated so that the front end of the locking screw abuts against the plug-in post to fix the ladder side to the side connecting frame.

11. The assembly method for docking boarding equipment according to claim 1, characterized in that: The assembly method for the docking boarding equipment also includes a method for disassembling the front ladder module and the rear ladder module, which includes the following steps: Step 1: Activate the lifting drive cylinder of the front ladder lifting support mechanism. The telescopic rod of the lifting drive cylinder retracts, causing the upper frame and the front ladder on the upper frame to fall. As the upper frame descends, the hook pin at the rear end of the upper frame axially disengages from the hook at the front end of the rear ladder. The upper frame, along with the front ladder, falls back onto the front chassis. Then, close the lifting drive cylinder. Step 2: Remove the connecting pin between the front connecting seat of the front chassis and the rear connecting seat of the rear chassis to separate the front and rear connecting seats and achieve the separation of the front and rear chassis; Step 3: Retract the rear ladder body onto the rear chassis to complete the separation of the front and rear ladder body modules.

12. The assembly method for docking boarding equipment according to claim 11, characterized in that: In step one, before activating the lifting drive cylinder, the retraction support mechanism is retracted. The positioning pins connecting the lower ends of the front and rear retraction rods to the front chassis are removed. Then, the front locking pin on the front retraction rod and the rear locking pin on the rear retraction rod are removed respectively. The front lower support rod of the front retraction rod is then retracted upwards, and the front lower support rod is rotated backwards so that its front locking plate engages with the front guide limit roller. The rear lower support rod of the rear retraction rod is then retracted upwards, and the rear lower support rod is rotated forwards so that its rear locking plate engages with the rear guide limit roller. The lifting drive cylinder is then activated. As the upper frame descends, the distance between the hinge point between the upper end of the front retraction rod and the upper frame and the front guide limit roller decreases. The front retraction rod gradually retracts, and the front upper support rod gradually enters the front lower support rod. The front retraction rod swings backwards until it is horizontal. Simultaneously, as the upper frame moves downwards, the distance between the rear retraction rod and the rear guide limit roller decreases. The distance between them gradually decreases, the rear retractable rod gradually retracts, the upper rear support rod gradually enters the lower rear support rod, and the rear retractable rod gradually swings forward and upward until it becomes horizontal. At this time, the lifting mechanism descends to its lowest point, and the front retractable rod is placed horizontally on the rear retractable rod. The lower end of the lower front support rod is provided with a connecting groove. The upper front support rod is fixedly connected to the lower front support rod via a front locking pin, a front upper pin hole, and a front lower pin hole. The lower end of the lower rear support rod is provided with a connecting groove. The upper rear support rod is fixedly connected to the lower rear support rod via a rear locking pin, a rear upper pin hole, and a rear lower pin hole. The connecting groove is provided with a connecting pin hole. The front and rear sides of the front chassis frame are respectively provided with plug-in rods. The lower end of the plug-in rod is fixedly connected to the front chassis frame. The plug-in rod is provided with a positioning pin hole. The plug-in rod is inserted into the connecting groove, and the positioning pin passes through the connecting pin hole and the positioning pin hole to fix the lower front support rod or the lower rear support rod to the plug-in rod.

13. The assembly method for docking boarding equipment according to claim 12, characterized in that: In step one, the front ladder includes an upper ladder with a docking platform at its front end. The docking platform includes a platform frame and platform sidewalls. To remove the platform sidewalls, first remove the platform sidewall guide mechanism, pull out the guide pin, remove the outer guide seat, then remove the screws at the lower end of the sidewall column, remove the sidewall column from the platform frame, press the connecting plate to disengage the locking block from the limiting block, then pull the platform sidewall forward and remove it. The platform frame has platform sidewalls on both sides. The left side of the platform frame has platform rollers from front to back. The platform frame has connecting plates on both sides. One end of the connecting plate is fixedly connected to the platform frame via a pressing spring, and the other end extends outward and downward to form a locking block. The lower end of the platform sidewall has a platform guide rail, and the platform guide rail has a limiting connecting plate. One side of the limiting connecting plate is fixedly connected to the platform sidewall, and the other side is spaced from front to back. The platform frame is equipped with a limiting block and a platform side guide mechanism. The platform side guide mechanism includes a side column, an inner guide seat, an inner roller, an outer guide seat, an outer roller, and a guide pin. A side column is provided on the inner side of the platform side. A guide rod is provided at the lower end of the side column. A guide groove is provided on the platform frame. The upper end of the guide rod is fixedly connected to the side column, and the lower end is inserted into the guide groove. The side column is threadedly connected to the platform frame with screws. An inner guide seat is provided on the side column. One side of the inner guide seat is fixedly connected to the side column, and the other side is provided with a connecting slot. Inner rollers are provided on both the front and rear sides of the connecting slot. A slot pin hole is provided on the connecting slot. An insert rod and an outer roller are provided on the outer guide seat. An insert rod pin hole is provided on the insert rod. The insert rod is inserted into the connecting slot. The guide pin passes through the slot pin hole and the insert rod pin hole to fix the insert rod to the inner guide seat.

14. The assembly method for docking boarding equipment according to claim 13, characterized in that: An upper ladder adjustment drive 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 via the upper ladder adjustment drive cylinder. The upper ladder adjustment drive cylinder is provided with a support and locking mechanism, which includes teeth, a pawl drive cylinder, and a pawl. Teeth are fixedly provided on the wall of the telescopic rod of the upper ladder adjustment drive cylinder. A pawl drive cylinder is provided on the cylinder seat of the upper ladder adjustment drive cylinder. A pawl is fixedly connected to the telescopic rod of the pawl drive cylinder. The pawl and teeth cooperate to lock the position of the telescopic rod of the upper ladder adjustment drive cylinder. In step one, the brake of the upper ladder adjustment drive cylinder is released, the pawl drive cylinder of the support locking mechanism is activated, the telescopic cylinder of the pawl drive cylinder retracts, causing the pawl to separate from the teeth, the lock on the upper ladder adjustment drive cylinder is released, the upper ladder adjustment drive cylinder is activated, the telescopic rod of the upper ladder adjustment drive cylinder retracts, the front end of the upper ladder falls with the docking platform, the upper ladder lands on the upper frame, and the upper ladder adjustment drive cylinder is closed.

15. The assembly method for docking boarding equipment according to claim 14, characterized in that: The platform frame includes a front platform section and a rear platform section. The rear end of the front platform section has a front hinge block, the front end of which is fixedly connected to the front platform section. A front connecting block is located at the lower end of the front hinge block, and is fixedly connected to the front hinge block. The rear end of the front connecting block extends rearward and has a front connecting pin hole. The front end of the rear platform section has a rear hinge block, the lower end of which has a rear connecting block, and is fixedly connected to the rear hinge block. The front end of the rear connecting block extends forward and has a rear connecting pin hole. The rear ends of the front and rear connecting blocks are opposite each other. The front and rear connecting blocks are fixedly connected via connecting pins, the front connecting pin hole, and the rear connecting pin hole. A flip pedal is located between the front and rear platform sections. The rear end of the flip pedal is hinged to the rear platform section. A flip connecting block is located on the lower surface of the flip pedal, and is fixedly connected to the flip pedal. The flip connecting block has a flip pin hole. The end face is provided with a flip-connecting pin hole. The flip-pin passes through the flip-connecting pin hole and the flip-connecting pin hole to fix the flip-connecting block to the front section of the platform. The front section of the platform is provided with a platform limiting shaft on at least one side. The platform limiting shaft is fixedly connected to the front section of the platform. The rear section of the platform is provided with a platform limiting hook on at least one side. The platform limiting hook is hinged to the rear section of the platform via a hook pin shaft. A torsion spring is sleeved on the hook pin shaft. The platform limiting hook is limited and connected to the rear section of the platform via the torsion spring. After the docking platform is lowered, the platform frame of the docking platform is folded, the flip pin at the lower end of the flip pedal is pulled out, and the flip pedal is rotated backward so that the flip pedal falls on the rear section of the platform. The connecting pins on the left and right sides of the platform frame are pulled out, and the front section of the platform is flipped backward so that the rear section of the platform is on the flip pedal and the rear section of the platform. The hook end at the upper end of the platform limiting hook is pulled backward so that the hook end of the platform limiting hook hooks the platform limiting shaft, thereby limiting and fixing the positions of the front section and the rear section of the platform.

16. The assembly method for docking boarding equipment according to claim 15, characterized in that: A platform support rod is provided between the upper ladder and the docking platform. The front end of the platform support rod has a support pin hole, and the lower end of the docking platform has a platform pin hole. The front end of the platform support rod is hinged to the docking platform via the support pin, the support pin hole, and the platform pin hole, and the rear end is hinged to the upper ladder. A retractable pin hole is provided between the two ends of the platform support rod. After the platform frame is folded, the platform frame is bent downwards and fixed. The support pin connecting the front end of the platform support rod to the docking platform is removed. At this time, the platform frame can rotate around the hinge point between it and the upper ladder. The retractable pin hole of the platform support rod is aligned with the platform pin hole, and the support pin is inserted into the retractable pin hole and the platform pin hole to limit and fix the position of the platform frame and the upper ladder.

17. The assembly method for docking boarding equipment according to claim 13, characterized in that: The rear ladder includes a middle ladder and a lower ladder. The lower ladder includes a first ladder and a second ladder. The upper ladder, the middle ladder, and the second ladder all have side hulls on both sides. A quick-connect mechanism for the side hulls is provided at the lower end of each side hull. This quick-connect mechanism includes a side hull connecting bracket, locking screws, and insertion pins. Side hull connecting brackets are fixedly provided on both sides of the upper ladder, the middle ladder, and the second ladder. A side hull slot is provided at the upper end of each side hull connecting bracket. Insertion holes are spaced apart on the side hull connecting brackets. Locking holes are provided on the side of each insertion hole, communicating with the insertion holes. A locking hole is provided inside the locking hole. The ladder has locking screws, and the lower end of the ladder side is provided with insertion posts at intervals. The upper end of the insertion post is fixedly connected to the ladder side. The outer diameter of the upper end of the insertion post matches the inner diameter of the insertion hole. The outer diameter of the upper part of the insertion post is larger than the outer diameter of the lower part of the insertion post. The lower end of the ladder side is inserted into the side slot. The insertion post is inserted into the insertion hole. The locking screw passes through the locking hole and abuts against the insertion post. The locking screw is threadedly connected to the side connecting bracket to fix the ladder side to the side connecting bracket. In step three, the ladder sides on both sides of the upper ladder, both sides of the middle ladder, and both sides of the second ladder are removed. The locking screws on the side connecting bracket are loosened so that the locking screws are separated from the insertion posts on the ladder side. Then the ladder side is pulled up.

18. The assembly method for docking boarding equipment according to claim 17, characterized in that: A ladder limiting connection mechanism is provided between the intermediate ladder and the lower ladder. The ladder limiting connection mechanism includes a limiting plate, a ladder limiting fixing seat, a baffle, a limiting spring, and a limiting handle. Limiting plates are respectively provided on both sides of the lower rear end of the intermediate ladder. The limiting plates are fixedly connected to the intermediate ladder, and the lower end of the limiting plate has a limiting slot. The rear end of the first ladder is hinged to the front end of the second ladder. The upper end of the second ladder mates with the intermediate ladder. Support wheels are installed on both sides of the lower end of the second ladder. Ladder limiting fixing seats are provided on both sides of the front end of the first ladder. The ladder limiting fixing seats are fixedly connected to the first ladder. The fixing seat has a limiting hole, through which a baffle and a limiting spring are installed. The baffle includes an upper section and a lower section. The upper end of the upper section is inserted into a limiting slot to limit and fix the front and rear positions of the first ladder and the intermediate ladder. The lower end of the upper section is fixedly connected to the lower section. The outer diameter of the upper section is larger than that of the lower section. The lower end of the lower section extends out of the limiting hole and has a limiting handle. The lower section is fixedly connected to the limiting handle. The limiting spring is sleeved on the lower section, with one end connected to the lower end of the upper section. One end abuts against the other end, and the other end abuts against the ladder limiting fixing seat. The outer diameter of the limiting handle is larger than the inner diameter of the limiting through hole. The rear chassis has lower rails at both ends, which are fixedly connected to the frame of the rear chassis. An upper rail is provided on the lower rails, which are fixedly connected to the frame of the rear chassis. After the upper frame is lowered in step one, the limiting plates on both sides of the middle ladder are released from braking. The limiting handle is pulled down, which moves the baffle downward. The baffle compresses the limiting spring downward, and the upper end of the baffle comes out of the limiting slot of the limiting plate. The second ladder is lifted up, and the second ladder is aligned with the first ladder. Rotate upwards from the hinge point until the second ladder is horizontal. Push the second ladder forward, and the second ladder pushes the first ladder forward. The first ladder rolls forward on the lower track of the rear chassis via rollers, causing both the first and second ladders to land on the rear chassis. The support wheel at the lower end of the second ladder engages with the rear chassis for limitation, causing the front of the middle ladder to drop downwards. The rear end of the middle ladder is equipped with rollers, and the front end of the middle ladder rotates downwards around the rollers until the middle ladder is horizontal. Push the middle ladder backwards, and the middle ladder slides on the upper track via rollers until it lands on the lower ladder. After completion, the ladder body is retracted.

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