Quickly-hooked airstairs

Abstract

The invention belongs to the technical field of airstairs, and particularly relates to a quick hooking airstair which comprises a chassis and a stair body, the stair body comprises an upper stair body, a middle stair body and a lower stair body, a front stair body lifting supporting mechanism is arranged between the upper stair body and the chassis, and a hooking mechanism is arranged between the front stair body lifting supporting mechanism and the middle stair body. The front end of the middle ladder is hinged to the front ladder body lifting supporting mechanism through a hanging mechanism, the lower end of the middle ladder is connected with the chassis through rollers and an upper rail, the upper end of the lower ladder is movably connected with the chassis, the front ladder body lifting supporting mechanism comprises a ladder body lifting mechanism, an upper frame and an upper ladder adjusting driving cylinder, and the hanging mechanism comprises a hanging pin shaft and a hanging hook. The lower end of the upper ladder is hinged to the upper frame, the front portion of the upper ladder is connected with the upper frame through an upper ladder adjusting driving cylinder, hooking pin shafts are arranged on the left side and the right side of the rear end of the upper frame, and hooking hooks are arranged on the two sides of the upper end of the rear ladder body.

Description

Technical Field

[0001] The present invention belongs to the technical field of boarding ladders, and specifically refers to a quick-connecting boarding ladder. Background Art

[0002] A boarding ladder is a ladder that connects the ground and the aircraft cabin door for passengers, crew members, ground crew, and maintenance personnel to get on and off the aircraft. The boarding ladder is usually a telescopic ladder. After retrieval, Chinese Patent CN113277110A discloses a passenger boarding ladder, which includes a chassis and a fixed ladder arranged obliquely. One end of the chassis is hinged with a support frame that extends obliquely upward towards the other end. A driving assembly capable of driving the support frame to swing around the hinge point between it and the chassis is arranged on the upper side of the chassis. A sliding ladder capable of reciprocatingly moving along its length direction is connected to the support frame. The fixed ladder is arranged in the same direction as the sliding ladder. The lower end of the fixed ladder is hinged on the support frame and the upper end overlaps the sliding ladder. The driving assembly includes two telescopic rods, two first telescopic members, and one second telescopic member. The first telescopic member is a cylinder, a hydraulic cylinder, or an electric push rod. The second telescopic member is a cylinder, a hydraulic cylinder, or an electric push rod. A first connecting seat is hinged at a position on the upper side of the chassis close to the cab. Disadvantages of the above patent: The above patent is provided with a fixed ladder and a sliding ladder, and the sliding ladder reciprocates on the support frame. However, this sliding method is prone to sliding jams and poor sliding, and requires operators to check and maintain in a timely manner, resulting in high maintenance costs. Second, in the above patent, the lower end of the sliding ladder is connected to the chassis through a driving assembly, and the driving assembly includes two telescopic rods, two first telescopic members, and one second telescopic member. The telescopic length of one cylinder, hydraulic cylinder, or electric push rod is limited, which makes the lifting height of the above boarding ladder limited and not suitable for aircraft docking with higher aircraft cabin doors. Third, there is a lack of support between the sliding ladder and the chassis in the above patent, resulting in unstable sliding of the sliding ladder and poor stability of the sliding ladder. Fourth, there is no limit between the fixed ladder and the sliding ladder on the platform in the above patent, and the sliding ladder is prone to sliding. When there are many tourists, stepping on it may cause sliding, resulting in panic. Fifth, the side rail installed on the docking platform or the side rail installed on the fixed ladder in the above patent is fixed, which makes the entire boarding ladder unusable once a problem occurs and requires waiting for maintenance, and the maintenance time is unknown, greatly reducing the pick-up efficiency of the boarding ladder. Sixth, the structure of the docking platform in the above patent is fixed, and it occupies a large space when not in use. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies of the prior art and provide a quick-connecting boarding ladder with novel structure, quick and smooth hanging connection, ladder body deployment, limited position, good support, and high stability.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: A quick - hook boarding ladder, comprising a chassis and a ladder body, is characterized in that: the ladder body includes a front ladder body and a rear ladder body. A front - ladder - lifting support mechanism is provided between the front ladder body and the chassis. The front ladder body is driven by the front - ladder - lifting support mechanism. A hooking mechanism is provided between the front - ladder - lifting support mechanism and the rear ladder body. The front end of the rear ladder body is connected to the front - ladder - lifting support mechanism through the hooking mechanism. The rear ladder body is movably connected to the chassis so as to hook the rear ladder body through the front - ladder - lifting support mechanism, enabling the front ladder body and the rear ladder body to be quickly deployed, and the front ladder body and the rear ladder body are butted to form the whole ladder body.

[0005] In the present invention, the front ladder body includes an upper ladder. The front - ladder - lifting support mechanism includes a ladder - lifting mechanism, an upper frame, and an upper - ladder adjustment driving cylinder. The hooking mechanism includes a hooking hook and a hooking pin. The lower end of the ladder - lifting mechanism is connected to the chassis, and the upper end is connected to the upper frame. The upper frame is provided with the upper ladder. On the left and right sides at the rear end of the upper frame, there are hooking pins. Both ends of the hooking pin are connected to the upper frame. An upper - ladder adjustment driving cylinder is provided between the upper ladder and the upper frame. The lower end of the upper ladder is hinged to the upper frame, and the front part of the upper ladder is connected to the upper frame through the upper - ladder adjustment driving cylinder. On both sides at the upper end of the rear ladder body, there are hooking hooks. The upper end of the hooking hook is cooperatively hooked and connected to the hooking pin. The lower end of the hooking hook is fixedly connected to the rear ladder body. So as to drive the upper frame to rise through the ladder - lifting mechanism. When the upper frame rises, the hooking pin touches the hooking hook, the hooking hook is hooked onto the hooking pin, and the hooking pin drives the hooking hook to rise, thereby driving the rear ladder body to rise and deploying the rear ladder body.

[0006] In the present invention, the rear ladder body includes an intermediate ladder and a lower ladder. On both sides at the rear end of the chassis, there are upper tracks, and the upper tracks are fixedly connected to the vehicle frame of the chassis. On both sides at the upper end of the intermediate ladder, there are fixedly - installed hooking hooks. On both sides at the lower end of the intermediate ladder, there are rollers installed. The lower end of the intermediate ladder is movably connected to the upper tracks of the chassis through the rollers. The upper end of the lower ladder is butted with the intermediate ladder, and the upper end of the lower ladder is hinged to the vehicle frame of the chassis. So that when not in use, the upper frame drops, the hooking hooks on the intermediate ladder are separated from the hooking pins, and the intermediate ladder rotates downward and moves backward through the rollers and the upper tracks, enabling the intermediate ladder to fall on the chassis.

[0007] In the present invention, a docking platform is provided at the front end of the upper ladder. The front end of the upper ladder is hinged to the rear end of the docking platform. A platform support rod is provided between the upper ladder and the docking platform. The front end of the platform support rod is hinged to the docking platform, and the rear end is hinged to the upper ladder. The docking platform is supported by the platform support rod and kept horizontal.

[0008] The docking platform described in the present invention includes a platform frame and platform sidewalls. The platform sidewalls are provided on the left and right sides of the platform frame. A platform sidewall connection mechanism is provided between the platform sidewalls and the platform frame. The platform sidewall connection mechanism includes platform rollers, connection clamping plates, compression springs, platform guide rails, and limit connection plates. Platform rollers are provided on the left side of the platform frame from front to back, and platform rollers are provided on the right side of the platform frame from front to back. The platform rollers are installed on the platform shafts through bearings, and the platform shafts are fixed on the platform frame. Connection clamping plates are provided on the left and right sides of the platform frame. One end of the connection clamping plate is fixedly connected to the platform frame through a compression spring, and the other end extends outward and downward to form a clamping block. The lower end of the platform sidewall is provided with a platform guide rail, and the platform guide rail is fixedly connected to the platform sidewall. The platform guide rail cooperates with the platform rollers. The platform sidewall is slidably connected to the platform frame through the platform guide rail and the platform rollers. A limit connection plate is provided on the platform guide rail. One side of the limit connection plate is fixedly connected to the platform sidewall, and the other side is provided with limit blocks at intervals from front to back. The clamping block is inserted between adjacent limit blocks to fixedly connect the platform sidewall and the platform frame. By stepping on the connection clamping plate and squeezing the spring, the clamping block is lifted, and the platform sidewall is slid into the platform frame. When the connection clamping plate is released, the spring rebounds, and the clamping block is clamped between adjacent limit blocks to fix the position of the platform sidewall relative to the platform frame.

[0009] A platform sidewall guiding mechanism is provided on the platform frame described in the present invention. The platform sidewall guiding mechanism includes sidewall columns, inner guiding seats, inner rollers, outer guiding seats, and outer rollers. Sidewall columns are provided inside the platform sidewalls. The lower ends of the sidewall columns are fixedly connected to the platform frame. Inner guiding seats are provided on the sidewall columns, and the inner guiding seats are fixedly connected to the sidewall columns. Inner rollers are installed on the inner guiding seats, outer guiding seats are provided on the inner guiding seats, and the outer guiding seats are fixedly connected to the inner guiding seats. Outer rollers are installed on the outer guiding seats. The inner rollers cooperate with the outer rollers. One side of the platform sidewall abuts against the inner rollers, and the other side abuts against the outer rollers to guide the forward and backward movement of the platform sidewall through the inner rollers and the outer rollers.

[0010] A connection slot is provided on the inner guiding seat described in the present invention. A slot pin hole is provided on the connection slot. The inner roller is installed on the inner roller shaft, and the upper and lower ends of the inner roller shaft are fixedly connected to the inner guiding seat. A plug rod is provided on the outer guiding seat, and the upper end of the plug rod is fixedly connected to the outer guiding seat. A plug rod pin hole is provided on the plug rod. The plug rod is inserted into the connection slot, and a guiding pin passes through the slot pin hole and the plug rod pin hole to fixedly connect the plug rod and the inner guiding seat. The outer roller is sleeved on the outer roller shaft, and the upper and lower ends of the outer roller shaft are fixedly connected to the outer guiding seat. By inserting and pulling out the guiding pin, the disassembly and assembly connection of the inner guiding seat and the outer guiding seat are realized.

[0011] At the lower end of the side hull column of the present invention, a guide rod is provided. A threaded hole is provided at the lower end of the side hull column. A guide groove is provided on the platform frame. The upper end of the guide rod is fixedly connected to the side hull column, and the lower end is inserted into the guide groove. The side hull column is threadedly connected to the platform frame by screws to facilitate the disassembly and assembly of the side hull column.

[0012] A ladder limit connection mechanism is provided between the middle ladder and the lower ladder of the present invention. The ladder limit connection mechanism includes a limit plate, a ladder limit fixing seat, a baffle, a limit spring, and a limit handle. Limit plates are respectively provided on both sides of the rear part of the lower end of the middle ladder. The limit plates are fixedly connected to the middle ladder. A limit slot is provided at the lower end of the limit plate. Ladder limit fixing seats are provided on both sides of the front end of the lower ladder. The ladder limit fixing seats are fixedly connected to the lower ladder. A limit through hole is provided on the ladder limit fixing seat. A baffle is inserted into the limit through hole. A limit spring is provided in the limit through hole. The upper end of the baffle passes through the limit through hole and extends into the limit slot to limit and connect the ladder limit fixing seat and the limit plate. The lower end of the baffle passes through the limit through hole and is provided with a limit handle. The spring is sleeved on the baffle. One end of the spring is connected to the baffle, and the other end is connected to the ladder limit fixing seat. The upper end of the limit handle is fixedly connected to the baffle, so as to facilitate manually pulling down the limit handle to squeeze the limit spring, the upper end of the baffle disengages from the limit slot, the middle ladder moves backward, driving the limit plate away from the baffle to release the limit. When the middle ladder rotates forward and upward to unfold, the front end of the limit plate touches and squeezes the baffle. When the middle ladder unfolds in place, the baffle is inserted into the limit slot of the limit plate to limit the middle ladder and the lower ladder.

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

[0014] The baffle of the present invention includes an upper section of the baffle and a lower section of the baffle. The upper end of the upper section of the baffle is matched with the limit slot. The lower end of the upper section of the baffle is fixedly connected to the lower section of the baffle. The outer diameter of the upper section of the baffle is larger than the outer diameter of the lower section of the baffle. The limit spring is sleeved on the lower section of the baffle. The upper end of the limit spring abuts against the lower end face of the upper section of the baffle, and the lower end abuts against the ladder limit fixing seat. The outer diameter of the limit handle is larger than the inner diameter of the limit through hole to facilitate the installation of the limit spring.

[0015] The lower ladder of the present invention includes a first ladder and a second ladder. Lower rails are provided on both sides of the rear end of the chassis. The lower rails are located below the upper rails and are fixedly connected to the frame of the chassis. Rollers are respectively installed on both sides of the first ladder. The first ladder is slidably connected to the lower rails via the rollers. The rear end of the first ladder is hinged to the front end of the second ladder. Ladder limit fixing seats are provided on both sides of the front end of the first ladder, and the ladder limit fixing seats are fixedly connected to the first ladder. The upper end of the second ladder is cooperatively docked with the lower end of the middle ladder, so that when not in use, the second ladder can be rotated upward with the hinge point between the second ladder and the first ladder as the center of the circle. After the second ladder is horizontal, push the second ladder forward. The second ladder follows the first ladder and slides forward along the lower rails via the rollers, and the second ladder and the first ladder can be stored on the chassis.

[0016] A platform foldable connection mechanism is provided on the platform frame of the present invention. The platform frame includes a front section of the platform and a rear section of the platform. The front section of the platform is connected to the rear section of the platform via the platform foldable connection mechanism. The platform foldable connection mechanism includes a front hinge block, a hinge connecting plate, a front connecting block, a rear hinge block, a rear connecting block, and a connecting pin. A front hinge block is provided at the rear end of the front section of the platform. The front end of the front hinge block is fixedly connected to the front section of the platform, and a hinge shaft hole is provided at the rear end. Hinge connecting plates are provided on both sides of the front hinge block. A front connecting block is provided at the lower end of the front hinge block, and the front connecting block is fixedly connected to the front hinge block. A front connecting pin hole extends backward from the rear end of the front connecting block. A rear hinge block is provided at the front end of the rear section of the platform. A hinge shaft hole is provided at the front end of the rear hinge block, and the rear end is fixedly connected to the rear section of the platform. A rear connecting block is provided at the lower end of the rear hinge block, and the rear connecting block is fixedly connected to the rear hinge block. A rear connecting pin hole extends forward from the front end of the rear connecting block. The front end of the hinge connecting plate is hinged to the front hinge block via a front hinge shaft, and the rear end is hinged to the rear hinge block via a rear hinge shaft. The rear end of the front connecting block and the front end of the rear connecting block face each other. The front connecting block and the rear connecting block are fixedly connected via a connecting pin, a front connecting pin hole, and a rear connecting pin hole, so that by pulling out the connecting pin, the front section of the platform can be flipped relative to the rear section of the platform around the front hinge shaft and folded with the rear section of the platform.

[0017] A flip pedal is provided between the front section of the platform and the rear section of the platform. The front end face of the flip pedal abuts against the rear end face of the front section of the platform, and the rear end face abuts against the front end face of the rear section of the platform. The rear end of the flip pedal is hinged to the rear section of the platform. A flip connecting block is provided on the lower end face of the flip pedal, and the flip connecting block is fixedly connected to the flip pedal. A flip pin hole is provided on the flip connecting block. A flip connecting pin hole is provided on the rear end face of the front section of the platform. A flip pin passes through the flip pin hole and the flip connecting pin hole to fixedly connect the flip connecting block to the front section of the platform, thereby fixing the flip pedal between the front section of the platform and the rear section of the platform. When the front section of the platform and the rear section of the platform need to be folded in half, pull out the flip pin, flip the flip pedal backward, and it lands on the rear section of the platform. Then, flip the front section of the platform backward and it lands on the rear section of the platform.

[0018] A platform folding limit mechanism is provided between the front section and the rear section of the platform according to the present invention. The platform folding limit mechanism includes a platform limit shaft, a platform limit hook, a hook pin shaft and a torsion spring. The platform limit shaft is provided on at least one side of the front section of the platform, and the platform limit shaft is fixedly connected to the front section of the platform. The platform limit hook is provided on at least one side of the rear section of the platform. The platform limit hook is hinged to the rear section of the platform through the hook pin shaft. The hook pin shaft is sleeved with a torsion spring. The platform limit hook is limit-connected to the rear section of the platform through the torsion spring. When the front section and the rear section of the platform are folded, the platform limit hook hooks the platform limit shaft to limit-connect the front section and the rear section of the platform, so that the hook end of the platform limit hook has a tendency to rotate backward through the torsion spring, prompting the limit hook to tightly hook the limit shaft.

[0019] The two sides of the ladder body according to the present invention are provided with ladder body side gunnels. A ladder body side gunnel quick connection mechanism is provided at the lower end of the ladder body side gunnel. The ladder body side gunnel quick connection mechanism includes a side gunnel connection frame, a locking screw and a plug post. The side gunnel connection frames are fixedly provided on the two sides of the ladder body. A side gunnel slot is provided at the upper end of the side gunnel connection frame. Plug holes are provided at intervals on the side gunnel connection frame. A locking hole is provided on the side of the plug hole, and the locking hole is communicated with the plug hole. A locking screw is provided in the locking hole. Plug posts are provided at intervals at the lower end of the ladder body side gunnel. The upper end of the plug post is fixedly connected to the ladder body side gunnel. The outer diameter of the upper end of the plug post matches the inner diameter of the plug hole. The outer diameter of the upper part of the plug post is larger than the outer diameter of the lower part of the plug post. The lower end of the ladder body side gunnel is snapped into the side gunnel slot, the plug post is inserted into the plug hole, the locking screw passes through the locking hole and abuts against the plug post, and the locking screw is threadedly connected to the side gunnel connection frame to fixedly connect the ladder body side gunnel and the side gunnel connection frame, so that by rotating the locking screw, the locking screw abuts against the plug post to fix the ladder body side gunnel and the side gunnel connection frame. Unscrew the locking screw and pull out the ladder body side gunnel, and the plug post is separated from the plug hole to separate the ladder body side gunnel and the side gunnel connection frame.

[0020] The trapezoid lifting mechanism of the present invention includes a simple supported beam group and a lifting drive cylinder. The simple supported beam groups are symmetrically arranged on the left and right sides of the front part of the chassis. The simple supported beam group includes an outer lower simple supported beam, an inner lower simple supported beam, an outer upper simple supported beam, and an inner upper simple supported beam. Lifting guide rails are fixedly arranged on both sides of the frame of the chassis. The outer lower simple supported beam and the inner lower simple supported beam are arranged on the frame of the chassis. A roller is installed at the lower end of the outer lower simple supported beam. The outer lower simple supported beam is slidably connected to the frame of the chassis through the roller and the lifting guide rail. The middle part of the outer lower simple supported beam is hinged to the inner lower simple supported beam on the same side. The outer upper simple supported beam is arranged at the upper end of the outer lower simple supported beam. The lower end of the inner lower simple supported beam is hinged to the frame of the chassis, and the inner upper simple supported beam is arranged at the upper end. The lower end of the outer upper simple supported beam is hinged to the outer lower simple supported beam. The middle part of the outer upper simple supported beam is hinged to the inner upper simple supported beam on the same side. A roller is arranged at the upper end of the outer upper simple supported beam. The lower end of the inner upper simple supported beam is hinged to the inner lower simple supported beam, and the upper end is hinged to the upper frame. Frame guide rails are fixedly arranged on both sides of the upper frame. The outer upper simple supported beam is slidably connected to the upper frame through the roller and the frame guide rail. A lifting drive cylinder is arranged between the inner upper simple supported beam and the inner lower simple supported beam. One end of the lifting drive cylinder is hinged to the inner upper simple supported beam, and the other end is hinged to the inner lower simple supported beam, which is beneficial to driving the lifting of the simple supported beam group through the lifting drive cylinder.

[0021] A retractable support mechanism is arranged between the chassis and the upper frame of the present invention. The retractable support mechanism includes a front retractable rod and a rear retractable rod. The front retractable rods are respectively arranged on both sides of the front end of the upper frame, and the rear retractable rods are respectively arranged on both sides of the rear end of the upper frame. The front retractable rod and the rear retractable rod are respectively telescopic rods. The upper end of the front retractable rod is hinged to the upper frame, and the lower end is detachably connected to the chassis. The upper end of the rear retractable rod is hinged to the upper frame, and the lower end is detachably connected to the chassis, which is convenient to remove the front retractable rod and the rear retractable rod from the chassis when not in use, and rotate the front retractable rod and the rear retractable rod respectively to the horizontal position for retraction around the hinge points with the upper frame.

[0022] On the inner upper simply supported beam on the same side of the front retractable rod of the present invention, there is a front guiding and limiting roller. The front retractable rod includes a front upper support rod and a front lower support rod. The upper end of the front upper support rod is hinged to the upper frame, and the lower end is inserted into the front lower support rod. The front upper support rod is slidably connected to the front lower support rod. There is a front upper pin hole in the lower part of the front upper support rod, and a front lower pin hole in the upper part of the front lower support rod. The lower end of the front lower support rod is detachably connected to the chassis. The front upper support rod is fixedly connected to the front lower support rod through a front locking pin, the front upper pin hole, and the front lower pin hole. There is a front clamping plate on the side wall of the front lower support rod. The front clamping plate is fixedly connected to the front lower support rod. There is a clamping groove on the front clamping plate. The front guiding and limiting roller is placed in the clamping groove of the front clamping plate. The front guiding and limiting roller abuts against the front clamping plate to limit the front lower support rod on the inner upper simply supported beam. On the outer lower simply supported beam on the same side of the rear retractable rod, there is a rear guiding and limiting roller. The rear retractable rod includes a rear upper support rod and a rear lower support rod. The upper end of the rear upper support rod is hinged to the upper frame, and the lower end is inserted into the rear lower support rod. The rear upper support rod is slidably connected to the rear lower support rod. There is a rear upper pin hole in the lower part of the rear upper support rod, and a rear lower pin hole in the upper part of the rear lower support rod. The lower end of the rear lower support rod is detachably connected to the chassis. The rear upper support rod is fixedly connected to the rear lower support rod through a rear locking pin, the rear upper pin hole, and the rear lower pin hole. There is a rear clamping plate on the side wall of the rear lower support rod. The rear clamping plate is fixedly connected to the rear lower support rod. There is a clamping groove on the rear clamping plate. The rear guiding and limiting roller is placed in the clamping groove of the rear clamping plate. The rear guiding and limiting roller abuts against the rear clamping plate to limit the rear lower support rod on the outer lower simply supported beam. In this way, by hanging the front lower support rod on the front guiding and limiting roller and the rear lower support rod on the rear guiding and limiting roller, the front retractable rod and the rear retractable rod can be telescoped as the ladder body lifting mechanism rises and falls.

[0023] At the lower end of the front lower support rod of the present invention, there is a connecting groove. At the lower end of the rear lower support rod, there is also a connecting groove. There is a connecting pin hole on the connecting groove. On the vehicle frame of the chassis, there is a plugging rod. The lower end of the plugging rod is fixedly connected to the vehicle frame of the chassis. There is a positioning pin hole on the plugging rod. The plugging rod is inserted into the connecting groove. The positioning pin passes through the connecting pin hole and the positioning pin hole to fixedly connect the front lower support rod or the rear lower support rod with the plugging rod, which is convenient for disassembly and assembly.

[0024] The trapezoid lifting mechanism of the present invention is provided with a frame automatic height measuring mechanism. The frame automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. An induction frame is provided between the inner upper simply supported beam and the inner lower simply supported beam. An induction groove is provided on the induction frame. The upper end of the induction plate is hinged to the inner upper simply supported beam. The induction plate is placed in the induction groove and is slidably connected to the induction frame. Induction holes are provided on the induction plate at intervals along the sliding direction of the induction plate. An inductor is provided at the upper end of the induction groove and is hinged to the inner lower simply supported beam at the lower end. The inductor is fixedly connected to the induction frame. The inductor cooperates with the induction holes for induction to read the length of the extension of the induction plate by the inductor sensing the number of induction holes.

[0025] An upper ladder automatic height measuring mechanism is provided between the upper frame and the upper ladder of the present invention. The upper ladder automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. An induction frame is provided on the upper frame. An induction groove is provided on the induction frame. An induction plate is provided in the induction groove. The lower end of the induction frame is hinged to the upper frame. The induction plate is slidably connected to the induction frame. The upper end of the induction plate is hinged to the upper ladder. Induction holes are provided on the induction plate at intervals along the sliding direction of the induction plate. An inductor is provided at the upper end of the induction groove. The inductor is fixedly connected to the induction frame. The inductor cooperates with the induction holes for induction to read the length of the extension of the induction plate by the inductor sensing the number of induction holes.

[0026] A support locking mechanism is provided on the upper ladder adjusting drive cylinder of the present invention. The support locking mechanism includes teeth, a pawl drive cylinder, and a pawl. Teeth are fixedly provided on the rod wall of the telescopic rod of the upper ladder adjusting drive cylinder. A pawl drive cylinder is provided on the cylinder seat of the upper ladder adjusting drive cylinder. A pawl is fixedly connected to the telescopic rod of the pawl drive cylinder. The pawl cooperates with the teeth to lock the position of the telescopic rod of the upper ladder adjusting drive cylinder to prevent the telescopic rod of the upper ladder adjusting drive cylinder from sliding when the upper ladder adjusting drive cylinder supports the upper ladder.

[0027] The ratchet driving cylinder of the present invention is provided with a ratchet clamping mechanism. The ratchet clamping mechanism includes a clamping adjustment plate, a first pin shaft, a second pin shaft, a clamping spring, a ratchet shaft connecting plate, and a ratchet shaft. The telescopic rod of the ratchet driving cylinder is provided with a clamping adjustment plate. One end of the clamping adjustment plate is provided with a first pin shaft, and the other end is provided with a second pin shaft. Clamping springs are arranged on both sides of the clamping adjustment plate. One end of the clamping adjustment plate is provided with a shaft hole, and the other end is provided with a long slot. The clamping adjustment plate is hinged to the telescopic rod of the ratchet driving cylinder through the first pin shaft. The second pin shaft passes through the long slot, and ratchet shaft connecting plates are arranged at both ends of the second pin shaft. One end of the ratchet shaft connecting plate is fixedly connected to the second pin shaft, and the other end is fixedly connected to the ratchet shaft. The ratchet is fixedly arranged on the ratchet shaft. One end of the clamping spring is connected to the first pin shaft, and the other end is connected to the second pin shaft. When the telescopic rod of the ratchet driving cylinder extends, the front end of the clamping adjustment plate drives the ratchet shaft to rotate. The ratchet shaft drives the ratchet to engage with the tooth. The clamping spring is compressed. There is a long slot at the front end of the clamping adjustment plate, so that after the clamping spring is compressed, it drives the second pin shaft to rotate towards the tooth, prompting the ratchet to be in close contact with the tooth.

[0028] Due to the adoption of the above structure, the present invention has the advantages of novel structure, hanging connection, rapid and smooth unfolding of the ladder body, limited position, good support, and high stability. Brief Description of the Drawings

[0029] Figure 1 is a schematic structural view of an angle of the present invention.

[0030] Figure 2 is a schematic structural view of another angle of the present invention.

[0031] Figure 3 is a schematic structural view of yet another angle of the present invention.

[0032] Figure 4 is the front view of the present invention.

[0033] Figure 5 is a schematic structural view of the front chassis after the present invention is disassembled.

[0034] Figure 6 is a schematic structural view of the rear chassis after the present invention is disassembled.

[0035] Figure 7 is an enlarged schematic view of the docking platform of the present invention.

[0036] Figure 8 is a schematic structural view of the platform frame of the present invention.

[0037] Figure 9 is a side view of the platform frame of the present invention.

[0038] Figure 10It is a schematic structural diagram after the folding of the platform framework of the present invention.

[0039] Figure 11 It is an enlarged schematic diagram of the docking platform in the present invention after removing one side of the platform side.

[0040] Figure 12 It is an enlarged schematic diagram of the connection card board of the present invention.

[0041] Figure 13 It is an enlarged schematic diagram of the platform side guiding mechanism of the present invention.

[0042] Figure 14 It is an enlarged schematic diagram of the inner guiding seat and the outer guiding seat of the present invention.

[0043] Figure 15 It is an exploded schematic diagram of the inner guiding seat and the outer guiding seat of the present invention.

[0044] Figure 16 It is an enlarged schematic diagram of the ladder body lifting mechanism and the retractable support mechanism of the present invention.

[0045] Figure 17 It is the present invention Figure 16 Schematic structural diagram after contraction.

[0046] Figure 18 It is a schematic diagram of the state where the retractable support mechanism extends with the ladder body lifting mechanism in the present invention.

[0047] Figure 19 It is an enlarged schematic diagram of the simply supported beam group in the present invention.

[0048] Figure 20 It is an enlarged schematic diagram of the support locking mechanism and the pawl clamping mechanism in the present invention. Figure 21 It is a schematic structural diagram of the pawl clamping mechanism in the present invention after removing one side of the pawl shaft connecting plate.

[0049] Figure 22 It is an enlarged schematic diagram of the automatic height measurement mechanism for the upper ladder in the present invention.

[0050] Figure 23 It is an enlarged schematic diagram of the automatic height measurement mechanism for the framework in the present invention.

[0051] Figure 24 It is an enlarged schematic diagram of one angle of the quick connection mechanism for the ladder body side in the present invention.

[0052] Figure 25 It is an enlarged schematic diagram of another angle of the quick connection mechanism for the ladder body side in the present invention.

[0053] Figure 26 It is an enlarged schematic diagram of the ladder limit connection mechanism in the present invention.

[0054] Figure 27 It is a schematic diagram of the state where the limit of the ladder limit connection mechanism of the present invention is released.

[0055] Figure 28 It is the present invention Figure 4 An enlarged view of part A in

[0056] Figure 29 It is the present invention Figure 4 An enlarged view of part of the ladder limit connection mechanism in

[0057] Reference numerals: chassis 1, ladder body 2, docking platform 3, upper ladder 4, middle ladder 5, lower ladder 6, front chassis 7, rear chassis 8, ladder body lifting mechanism 9, upper frame 10, hanging pin shaft 11, upper ladder adjustment drive cylinder 12, platform support rod 13, rear connection seat 14, front connection seat 15, lower track 16, upper track 17, hanging hook 18, support wheel 19, platform frame 20, platform side hull 21, platform side hull connection mechanism 22, platform roller 23, connecting card plate 24, pressing spring 25, platform guide rail 26, limit connecting plate 27, clamping block 28, limit block 29, platform side hull guiding mechanism 30, side hull column 31, inner guiding seat 32, inner roller 33, outer guiding seat 34, outer roller 35, guiding pin 36, guiding rod 37, inserting rod 38, ladder limit connection mechanism 39, limit plate 40, ladder limit fixing seat 41, baffle plate 42, limit spring 43, limit handle 44, limit slot 45, first ladder 46, second ladder 47, upper section of baffle plate 48, lower section of baffle plate 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 pedal 59, flipping connecting block 60, flipping pin 61, platform folding limit mechanism 62, platform limit shaft 63, platform limit hook 64, hook pin shaft 65, torsion spring 66, ladder body side hull 67, ladder body side hull quick connection mechanism 68, side hull connection frame 69, locking screw 70, inserting column 71, side hull clamping slot 72, inserting hole 73, simple support beam group 74, lifting drive cylinder 75, outer lower simple support beam 76, inner lower simple support beam 77, outer upper simple support beam 78, inner upper simple support beam 79, connecting beam 80, retracting and extending support mechanism 81, front retracting and extending rod 82, rear retracting and extending rod 83, front guiding and limiting roller 84, front locking pin 85, front clamping plate 86, rear guiding and limiting roller 87, inserting 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, induction frame 96, induction plate 97, inductor 98, induction hole 99, upper ladder automatic height measuring mechanism 100, support locking mechanism 101, tooth 102, pawl drive cylinder 103, pawl 104, pawl clamping mechanism 105, clamping adjustment plate 106, first pin shaft 107, second pin shaft 108, clamping spring 109, pawl shaft connecting plate 110, pawl shaft 111, long slot 112. Detailed implementation manners

[0058] The following combines the accompanying drawings to further describe in detail the specific implementation manners of the present invention.

[0059] A fast-hooking boarding ladder, comprising a chassis 1 and a ladder body 2. A docking platform 3 is installed at the front end of the ladder body 2. It is characterized in that: the ladder body 2 includes an upper ladder 4, a middle ladder 5 and a lower ladder 6. The chassis 1 includes a front chassis 7 and a rear chassis 8. A ladder lifting mechanism 9 is provided on the front chassis 7. An upper frame 10 is provided at the upper end of the ladder lifting mechanism 9. The lower end of the ladder lifting mechanism 9 is connected to the front chassis 7, and the upper end is connected to the upper frame 10. The upper ladder 4 is provided on the upper frame 10. Hooking pins 11 are provided on the left and right sides at the rear end of the upper frame 10. Both ends of the hooking pins 11 are fixedly connected to the upper frame 10 through bearings. 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 through the upper ladder adjustment drive cylinder 12 to drive the upper ladder through the upper ladder adjustment drive cylinder. When not in use, the upper ladder adjustment drive cylinder retracts, and the upper ladder falls 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. A support pin hole is provided at the front end of the platform support rod 13. A platform pin hole is provided at the lower end of the docking platform 3. The front end of the platform support rod 13 is hinged to the docking platform 3 through a support pin, a support pin hole and a platform pin hole, and the rear end is hinged to the upper ladder 4, so that it is convenient to pull out the support pin, and the docking platform can rotate around the hinge point of the docking platform and the upper ladder, which is convenient for storage. A rear connection seat 14 is fixedly provided at the front end of the rear chassis 8. A front connection seat 15 is fixedly provided at the rear end of the front chassis 7. Pin holes are respectively provided on the rear connection seat 14 and the front connection seat 15. A connection pin is inserted through the pin holes. The rear chassis 8 is fixedly connected to the front chassis 7 through the connection pin and the pin holes, so that it is convenient to pull out the connection pin to separate the front chassis and the rear chassis, and insert the connection pin to fix the front chassis and the rear chassis. Lower rails 16 are provided at both ends of the rear chassis 8. The lower rails 16 are located at the upper end of the rear chassis 8. The lower rails 16 are fixedly connected to the rear chassis 8. Upper rails 17 are provided on the lower rails 16. The upper rails 17 are fixedly connected to the rear chassis 8. Hooking hooks 18 are provided on both sides at the upper end of the middle ladder 5. The upper end of the hooking hooks 18 is engaged and connected with the hooking pins 11. The lower end of the hooking hooks 18 is fixedly connected to the middle ladder 5. Rollers are installed on both sides at the lower end of the middle ladder 5. The lower end of the middle ladder 5 is movably connected to the upper rail 17 of the rear chassis 8 through the rollers. Rollers are installed on both sides at the upper end of the lower ladder 6. The upper end of the lower ladder 6 is movably connected to the lower rail 16 of the rear chassis 8 through the rollers. Support wheels 19 are installed on both sides at the lower end of the lower ladder 6, so that when not in use, the ladder lifting mechanism drives the upper ladder to move downward and is stored above the front chassis. The upper ladder lifting mechanism will drive the upper frame to move downward, and the hooking pins on the upper frame will be disengaged from the hooking hooks downward. The middle ladder will slide downward and be stored in the upper rail of the rear chassis. The lower ladder can be stored upward in the lower rail of the rear chassis. Pull out the connection pin to separate the front and rear chassis, which is convenient for disassembly, installation and transportation.

[0060] The docking platform 3 according to the present invention includes a platform frame 20 and platform sidewalls 21. The 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 clamping plates 24, pressing springs 25, platform guide rails 26, and limit connecting plates 27. Platform rollers 23 are provided on the left side of the platform frame 20 from front to back, and platform rollers 23 are provided on the right side of the platform frame 20 from front to back. The platform rollers 23 are installed on a platform shaft through bearings, and the platform shaft is fixed on the platform frame 20. Connecting clamping plates 24 are provided on the left and right sides of the platform frame 20. One end of the connecting clamping plate 24 is fixedly connected to the platform frame 20 through a pressing spring 25, and the other end extends outward and downward to form a clamping block 28. A platform guide rail 26 is provided at the lower end of the platform sidewall 21. The platform guide rail 26 is fixedly connected to the platform sidewall 21. The platform guide rail 26 is matched with the platform rollers 23. The platform sidewall 21 is slidably connected to the platform frame 20 through the platform guide rail 26 and the platform rollers 23, so as to install the platform sidewall on the platform frame through the platform guide rail and the platform rollers. A limit connecting plate 27 is provided on the platform guide rail 26. One side of the limit connecting plate 27 is fixedly connected to the platform sidewall 21, and the other side is provided with limit blocks 29 at intervals from front to back. The clamping block 28 is inserted between adjacent limit blocks 29 to fixedly connect the platform sidewall 21 to the platform frame 20. By stepping on the connecting clamping plate and squeezing the spring, the clamping block is lifted, the platform sidewall is slid into the platform frame, the connecting clamping plate is released, the spring rebounds, and the clamping block is clamped between adjacent limit blocks to fix the position of the platform sidewall relative to the platform frame.

[0061] The platform frame 20 of the present invention is provided with a platform sidewall guiding mechanism 30. The platform sidewall guiding mechanism 30 includes a sidewall column 31, an inner guiding seat 32, an inner roller 33, an outer guiding seat 34, an outer roller 35, and a guiding pin 36. A sidewall column 31 is provided inside the platform sidewall 21. A guiding rod 37 is provided at the lower end of the sidewall column 31. A threaded hole is provided at the lower end of the sidewall column 31. A guiding groove is provided on the platform frame 20. The upper end of the guiding rod 37 is fixedly connected to the sidewall column 31, and the lower end is inserted into the guiding groove. The sidewall column 31 is threadedly connected to the platform frame 20 by screws to facilitate the disassembly and assembly of the sidewall column. An inner guiding seat 32 is provided on the sidewall column 31. One side of the inner guiding seat 32 is fixedly connected to the sidewall column 31, and a connecting slot is provided on the other side. Inner rollers 33 are provided on both the front and rear sides of the connecting slot. A slot pin hole is provided on the connecting slot. The inner rollers 33 are installed on inner roller shafts. The upper and lower ends of the inner roller shafts are fixedly connected to the inner guiding seat 32. An insertion rod 38 and an outer roller 35 are provided on the outer guiding seat 34. The upper end of the insertion rod 38 is fixedly connected to the outer guiding seat 34. The insertion rod 38 is hollow. An insertion rod pin hole is provided on the insertion rod 38. The insertion rod 38 is inserted into the connecting slot. The guiding pin 36 passes through the slot pin hole and the insertion rod pin hole to fixedly connect the insertion rod 38 to the inner guiding seat 32. The outer roller 35 and the inner roller 33 are spaced opposite to each other. One side of the platform sidewall 21 abuts against the inner roller 33, and the other side abuts against the outer roller 35. The outer roller 35 is sleeved on an outer roller shaft. The upper and lower ends of the outer roller shaft are fixedly connected to the outer guiding seat 34 to guide the forward and backward movement of the platform sidewall through the inner roller and the outer roller.

[0062] A ladder position-limiting connection mechanism 39 is provided between the middle ladder 5 and the lower ladder 6 of the present invention. The ladder position-limiting connection mechanism 39 includes a limiting plate 40, a ladder position-limiting fixed 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 rear part of the lower end of the middle ladder 5. The limiting plates 40 are fixedly connected to the middle 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. The upper end of the second ladder 47 is cooperatively butted with the middle ladder 5. Support wheels 19 are installed on both sides of the lower end of the second ladder 47. Rollers are installed on both sides of the first ladder 46. The first ladder 46 is slidably connected to the lower track 16 of the rear chassis 8 through the rollers. The rear end of the first ladder 46 is hinged to the front end of the second ladder 47. Ladder position-limiting fixed seats 41 are provided on both sides of the front end of the first ladder 46. The ladder position-limiting fixed seats 41 are fixedly connected to the first ladder 46. A limiting perforation is provided on the ladder position-limiting fixed seat 41. A baffle 42 is inserted into the limiting perforation. A limiting spring 43 is provided in the limiting perforation. The baffle 42 includes an upper baffle section 48 and a lower baffle section 49. The upper end of the upper baffle section 48 is inserted into the limiting slot 45 to limit and fix the front and rear positions of the first ladder 46 and the middle ladder 5. The lower end of the upper baffle section 48 is fixedly connected to the lower baffle section 49. The outer diameter of the upper baffle section 48 is larger than the outer diameter of the lower baffle section 49. The lower end of the lower baffle section 49 passes through the limiting perforation and is provided with a limiting handle 44. The lower baffle section 49 is fixedly connected to the limiting handle 44. The limiting spring 43 is sleeved on the lower baffle section 49. One end of the limiting spring 43 abuts against the lower end face of the upper end of the baffle 42, and the other end abuts against the ladder position-limiting fixed seat 41. The outer diameter of the limiting handle 44 is larger than the inner diameter of the limiting perforation. When it is necessary to retract the lower ladder, the limiting handle is manually pulled downward to compress the limiting spring, and the upper end of the upper baffle section is disengaged from the limiting slot. Then, the second ladder is lifted, and the second ladder is rotated upward around its hinge point with the first ladder. After rotating to the horizontal position, the second ladder is pushed forward, and the first ladder drives the second ladder to move forward along the lower track to retract the entire lower ladder. When it is necessary to deploy the lower ladder, the second ladder is pulled backward and then rotated downward. The upper end of the upper baffle section at the front end of the first ladder enters the limiting slot to realize automatic limiting of the first ladder and the middle ladder.

[0063] The front end face of the limiting plate 40 of the present invention extends downward and backward to form a guiding surface to facilitate the upper baffle section to automatically slide into the limiting slot along the guiding surface.

[0064] The platform frame 20 of the present invention is provided with a platform foldable connection mechanism 50. The platform foldable connection mechanism 50 includes a front hinge block 51, a hinge connecting plate 52, a front connection block 53, a rear hinge block 54, a rear connection block 55, and a connection pin 56. The platform frame 20 includes a front platform section 57 and a rear platform section 58. 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. Both sides of the front hinge block 51 are provided with hinge connecting plates 52. The lower end of the front hinge block 51 is provided with a front connection block 53. The front connection block 53 is fixedly connected to the front hinge block 51. The rear end of the front connection block 53 extends backward and is provided with a front connection pin hole. The front end of the rear platform section 58 is provided with a rear hinge block 54. The front end of the rear hinge block 54 is provided with a hinge shaft hole, and the rear end is fixedly connected to the rear platform section 58. The lower end of the rear hinge block 54 is provided with a rear connection block 55. The rear connection block 55 is fixedly connected to the rear hinge block 54. The front end of the rear connection block 55 extends forward and is provided with a rear connection pin hole. The front end of the hinge connecting plate 52 is hinged to the front hinge block 51 via a front hinge shaft, and the rear end is hinged to the rear hinge block 54 via a rear hinge shaft. The rear end of the front connection block 53 and the front end of the rear connection block 55 face each other. The front connection block 53 and the rear connection block 55 are fixedly connected via the connection pin 56, the front connection pin hole, and the rear connection pin hole. It is beneficial to pull out the connection pin, and the front platform section can be flipped relative to the rear platform section around the front hinge shaft and folded with the rear platform section.

[0065] A flip pedal 59 is provided between the front platform section 57 and the rear platform section 58 of the present invention. The front end face of the flip pedal 59 abuts against the rear end face of the front platform section 57, and the rear end face abuts against the front end face of the rear platform section 58. The rear end of the flip pedal 59 is hinged to the rear platform section 58. The lower end face of the flip pedal 59 is provided with a flip connection block 60. The flip connection block 60 is fixedly connected to the flip pedal 59. The flip connection block 60 is provided with a flip pin hole. The rear end face of the front platform section 57 is provided with a flip connection pin hole. A flip pin 61 passes through the flip pin hole and the flip connection pin hole to fixedly connect the flip connection block 60 to the front platform section 57, thereby fixing the flip pedal between the front platform section and the rear platform section. When the front platform section and the rear platform section need to be folded in half, pull out the flip pin, flip the flip pedal backward, and let it fall on the rear platform section. Then, flip the front platform section backward and let it fall on the rear platform section.

[0066] A platform folding limit mechanism 62 is provided between the front section 57 and the rear section 58 of the platform according to the present invention. The platform folding limit mechanism 62 includes a platform limit shaft 63, a platform limit hook 64, a hook pin shaft 65 and a torsion spring 66. The platform limit shaft 63 is provided on at least one side of the front section 57 of the platform, and the platform limit shaft 63 is fixedly connected to the front section 57 of the platform. The platform limit hook 64 is provided on at least one side of the rear section 58 of the platform. The platform limit hook 64 is hinged to the rear section 58 of the platform through the hook pin shaft 65. The torsion spring 66 is sleeved on the hook pin shaft 65. The platform limit hook 64 is limit-connected to the rear section 58 of the platform through the torsion spring 66, so that the hook end of the platform limit hook has a tendency to rotate backward through the torsion spring. When the front section 57 and the rear section 58 of the platform are folded, the platform limit hook 64 hooks the platform limit shaft 63 to limit-connect the front section 57 and the rear section 58 of the platform.

[0067] Ladder side gunnels 67 are provided on both sides of the upper ladder 4 according to the present invention. Ladder side gunnels 67 are provided on both sides of the middle ladder 5. Ladder side gunnels 67 are provided on both sides of the second ladder 47. A ladder side gunnel quick connection mechanism 68 is provided at the lower end of the ladder side gunnel 67. The ladder side gunnel quick connection mechanism 68 includes a side gunnel connection frame 69, a locking screw 70 and a plug column 71. The side gunnel connection frame 69 is fixedly provided on both sides of the upper ladder 4. The side gunnel connection frame 69 is fixedly provided on both sides of the middle ladder 5. The side gunnel connection frame 69 is fixedly provided on both sides of the second ladder 47. A side gunnel slot 72 is provided at the upper end of the side gunnel connection frame 69. Plug holes 73 are provided at intervals on the side gunnel connection frame 69. A locking hole is provided on the side of the plug hole 73, and the locking hole communicates with the plug hole 73. The locking screw 70 is provided in the locking hole. Plug columns 71 are provided at intervals at the lower end of the ladder side gunnel 67. The upper end of the plug column 71 is fixedly connected to the ladder side gunnel 67. The outer diameter of the upper end of the plug column 71 matches the inner diameter of the plug hole 73. The outer diameter of the upper part of the plug column 71 is larger than the outer diameter of the lower part of the plug column 71. The lower end of the ladder side gunnel 67 is snapped into the side gunnel slot 72, the plug column 71 is inserted into the plug hole 73, the locking screw 70 passes through the locking hole and abuts against the plug column 71, and the locking screw 70 is threadedly connected to the side gunnel connection frame 69 to fixedly connect the ladder side gunnel 67 and the side gunnel connection frame 69, so that by rotating the locking screw, the locking screw abuts against the plug column to fix the ladder side gunnel and the side gunnel connection frame, unscrewing the locking screw and pulling out the ladder side gunnel, and the plug column is separated from the plug hole, the ladder side gunnel and the side gunnel connection frame can be separated.

[0068] The ladder-shaped lifting mechanism 9 of the present invention includes a simple supported beam group 74 and a lifting drive cylinder 75. The simple supported beam group 74 is symmetrically arranged on both sides of the front chassis 7. The simple supported beam group 74 includes an outer lower simple supported beam 76, an inner lower simple supported beam 77, an outer upper simple supported beam 78, and an inner upper simple supported beam 79. Lifting guide rails are arranged on both sides of the front chassis 7. The outer lower simple supported beam 76 is arranged on both sides of the front part of the front chassis 7, and the inner lower simple supported beam 77 is arranged on both sides of the rear part of the front chassis 7. A roller is installed at the lower end of the outer lower simple supported beam 76. The outer lower simple supported beam 76 is slidably connected to the front chassis 7 through the roller and the lifting guide rail. The middle part of the outer lower simple supported beam 76 is hinged to the inner lower simple supported beam 77 on the same side. The outer upper simple supported beam 78 is arranged at the upper end of the outer lower simple supported beam 76. The lower end of the inner lower simple supported beam 77 is hinged to the front chassis 7, and the inner upper simple supported beam 79 is arranged at the upper end. The lower end of the outer upper simple supported beam 78 is hinged to the outer lower simple supported beam 76. The middle part of the outer upper simple supported beam 78 is hinged to the inner upper simple supported beam 79 on the same side. A roller is arranged at the upper end of the outer upper simple supported beam 78. The lower end of the inner upper simple supported beam 79 is hinged to the inner lower simple supported beam 77, and the upper end is hinged to the upper frame 10. Frame guide rails are arranged on both sides of the upper frame 10. The outer upper simple supported beam 78 is slidably connected to the upper frame 10 through the roller and the frame guide rail. A connecting beam 80 is connected between the two outer lower simple supported beams 76 on both sides of the front chassis 7, a connecting beam 80 is connected between the two inner lower simple supported beams 77, a connecting beam 80 is connected between the two outer upper simple supported beams 78, and a connecting beam 80 is connected between the two inner upper simple supported beams 79 to realize the synchronous lifting of the two groups of simple supported beam groups. A lifting drive cylinder 75 is arranged between the inner upper simple supported beam 79 and the inner lower simple supported beam 77. One end of the lifting drive cylinder 75 is hinged to the inner upper simple supported beam 79, and the other end is hinged to the inner lower simple supported beam 77 to facilitate driving the simple supported beam group to lift through the lifting drive cylinder.

[0069] A retractable support mechanism 81 is provided between the front chassis 7 and the upper frame 10 of the present invention. The retractable support mechanism 81 includes a front retractable rod 82, a rear retractable rod 83, a front guiding and limiting roller 84, a front locking pin 85, a front clamping plate 86, a rear guiding and limiting roller 87, a rear locking pin, a rear clamping plate 89, a plugging rod 88 and a positioning pin 90. The front retractable rods 82 are respectively provided on both sides of the front end of the upper frame 10, and the rear retractable rods 83 are respectively provided on both sides of the rear end of the upper frame 10. The front guiding and limiting roller 84 is provided on the inner upper simple support beam 79 on the same side of the front retractable rod 82. The front retractable rod 82 includes a front upper support rod 91 and a front lower support rod 92. The upper end of the front upper support rod 91 is hinged to the upper frame 10, and the lower end is inserted into the front lower support rod 92. The front upper support rod 91 is slidably connected to the front lower support rod 92. A front upper pin hole is provided at the lower part of the front upper support rod 91, a front lower pin hole is provided at the upper part of the front lower support rod 92, and a connecting groove is provided at the lower end of the front lower support rod 92. The front upper support rod 91 is fixedly connected to the front lower support rod 92 through the front locking pin 85, the front upper pin hole and the front lower pin hole. When the front upper support rod rises with the upper frame and is pulled out from the front lower support rod in place, the positions of the front upper support rod and the front lower support rod are fixed through the front locking pin. A front clamping plate 86 is provided on the side wall of the front lower support rod 92. The front clamping plate 86 is fixedly connected to the front lower support rod 92. A clamping slot is provided on the front clamping plate 86. The front guiding and limiting roller 84 is placed in the clamping slot of the front clamping plate 86, and the front guiding and limiting roller 84 abuts against the front clamping plate 86 to limit the front lower support rod 92 on the inner upper simple support beam 79. The rear guiding and limiting roller 87 is provided on the outer lower simple support beam 76 on the same side of the rear retractable rod 83. The rear retractable rod 83 includes a rear upper support rod 93 and a rear lower support rod 94. The upper end of the rear upper support rod 93 is hinged to the upper frame 10, and the lower end is inserted into the rear lower support rod 94. The rear upper support rod 93 is slidably connected to the rear lower support rod 94. A rear upper pin hole is provided at the lower part of the rear upper support rod 93, a rear lower pin hole is provided at the upper part of the rear lower support rod 94, and a connecting groove is provided at the lower end of the rear lower support rod 94. The rear upper support rod 93 is fixedly connected to the rear lower support rod 94 through the rear locking pin, the rear upper pin hole and the rear lower pin hole. When the rear upper support rod rises with the upper frame and is pulled out from the rear lower support rod in place, the positions of the rear upper support rod and the rear lower support rod are fixed through the rear locking pin. A rear clamping plate 89 is provided on the side wall of the rear lower support rod 94. The rear clamping plate 89 is fixedly connected to the rear lower support rod 94. A clamping slot is provided on the rear clamping plate 89. The rear guiding and limiting roller 87 is placed in the clamping slot of the rear clamping plate 89, and the rear guiding and limiting roller 87 abuts against the rear clamping plate 89 to limit the rear lower support rod 94 on the outer lower simple support beam 76. A connecting pin hole is provided on the connecting groove. Plugging rods 88 are respectively provided on both sides of the front end and both sides of the rear end of the front chassis 7. The lower end of the plugging rod 88 is fixedly connected to the front chassis 7. A positioning pin hole is provided on the plugging rod 88. The plugging rod 88 is inserted into the connecting groove.The positioning pin 90 passes through the connecting pin shaft hole and the positioning pin hole to fixedly connect the front lower support rod or the rear lower support rod with the insertion rod 88. After the ladder body lifting mechanism raises the upper frame, the front lower support rod is removed from the front guiding and limiting roller, and the lower end of the front lower support rod is inserted on the insertion rod 88. The front lower support rod and the front upper support rod are locked by the front locking pin, so that the front upper support rod and the front lower support rod support the upper frame. Similarly, the rear upper support rod and the rear lower support rod support the upper frame.

[0070] The hinge point of the front upper support rod 91 and the upper frame 10 of the present invention is higher than the hinge point of the rear upper support rod 93 and the upper frame 10, so that when folding up, the front retractable rod is placed at the upper end of the rear retractable rod.

[0071] A frame automatic height measuring mechanism 95 is provided on the ladder body lifting mechanism 9 of the present invention. The frame automatic height measuring mechanism 95 includes an induction frame 96, an induction plate 97, and an inductor 98. An induction frame 96 is provided between the inner upper simply supported beam 79 and the inner lower simply supported beam 77. An induction groove is provided on the induction frame 96. The upper end of the induction plate 97 is hinged to the inner upper simply supported beam 79. The induction plate 97 is placed in the induction groove and is slidably connected to the induction frame 96. Induction holes 99 are provided at intervals along the sliding direction of the induction plate 97 on the induction plate 97. The inductor 98 is provided at the upper end of the induction groove and is hinged to the inner lower simply supported beam 77 at the lower end. The inductor 98 is fixedly connected to the induction frame 96. The inductor 98 cooperates with the induction holes 99 for induction, so as to read the length of the induction plate extending out by the inductor sensing the number of induction holes.

[0072] An upper ladder automatic height measuring mechanism 100 is provided between the upper frame 10 and the upper ladder 4 of the present invention. The upper ladder automatic height measuring mechanism 100 includes an induction frame, an induction plate, and an inductor. An induction frame is provided on the upper frame. An induction groove is provided on the induction frame. An induction plate is provided in the induction groove. The lower end of the induction frame is hinged to the upper frame. The induction plate is slidably connected to the induction frame. The upper end of the induction plate is hinged to the upper ladder. Induction holes are provided at intervals along the sliding direction of the induction plate on the induction plate. The inductor is provided at the upper end of the induction groove. The inductor is fixedly connected to the induction frame. The inductor cooperates with the induction holes for induction, so as to read the length of the induction plate extending out by the inductor sensing the number of induction holes.

[0073] A support locking mechanism 101 is provided on the upper ladder adjusting drive cylinder 12 of the present invention. The support locking mechanism 101 includes a tooth 102, a pawl drive cylinder 103, and a pawl 104. A tooth 102 is fixedly provided on the rod wall of the telescopic rod of the upper ladder adjusting drive cylinder 12. A pawl drive cylinder 103 is provided on the cylinder base of the upper ladder adjusting drive cylinder 12. A pawl 104 is fixedly connected to the telescopic rod of the pawl drive cylinder 103. The pawl 104 cooperates with the tooth 102 to lock the position of the telescopic rod of the upper ladder adjusting drive cylinder 12, so as to prevent the telescopic rod of the upper ladder adjusting drive cylinder from sliding when the upper ladder is supported.

[0074] A pawl clamping mechanism 105 is provided on the pawl drive cylinder 103 of the present invention. The pawl clamping mechanism 105 includes a clamping adjustment plate 106, a first pin shaft 107, a second pin shaft 108, a clamping spring 109, a pawl shaft connecting plate 110, and a pawl shaft 111. A clamping adjustment plate 106 is provided on the telescopic rod of the pawl drive cylinder 103. One end of the clamping adjustment plate 106 is provided with a first pin shaft 107, and the other end is provided with a second pin shaft 108. Clamping springs 109 are provided on both sides of the clamping adjustment plate 106. One end of the clamping adjustment plate 106 is provided with a shaft hole, and the other end is provided with a long slot 112. The clamping adjustment plate 106 is hinged to the telescopic rod of the pawl drive cylinder 103 through the first pin shaft 107. The second pin shaft 108 passes through the long slot 112. Pawl shaft connecting plates 110 are provided at both ends of the second pin shaft 108. One end of the pawl shaft connecting plate 110 is fixedly connected to the second pin shaft 108, and the other end is fixedly connected to the pawl shaft 111. The pawl 104 is fixedly arranged on the pawl shaft 111. One end of the clamping spring 109 is connected to the first pin shaft 107, and the other end is connected to the second pin shaft 108, which is beneficial to the telescopic rod of the pawl drive cylinder to extend. The front end of the clamping adjustment plate drives the pawl shaft to rotate. The pawl shaft drives the pawl to engage with the tooth. The clamping spring is compressed. There is a long slot at the front end of the clamping adjustment plate, so that after the clamping spring is compressed, it drives the second pin shaft to rotate towards the tooth, prompting the pawl to be in close contact with the tooth.

[0075] A retractable pin hole is provided between the two ends of the platform support rod 13 of the present invention, which is convenient for turning the docking platform downward and storing it on the front side of the front chassis after removing the offline support pin. At this time, the support pin can be inserted into the retractable pin hole and the platform pin hole to fix the docking platform to the upper ladder, thus avoiding the shaking of the docking platform during transportation.

[0076] As attached Figure 1 - attached Figure 27, the front end of the front chassis 7 can be moved by being towed by a tractor or manually dragged, which can be set according to requirements. A control system can be set on the chassis 1, such as a PLC control system. The upper ladder adjusting drive cylinder 12, the lifting drive cylinder 75, the inductor 98, the inductor of the automatic height measuring mechanism 100 of the upper ladder 4, the support locking mechanism 101, and the pawl drive cylinder 103 are all connected to the control system. A display screen or a control switch can also be set, and the display screen or the control switch is connected to the control system. Control buttons for the above-mentioned drive cylinders or inductors are provided on the display screen or the control switch. When in use, the display screen or the control switch can be manually picked up for convenient manual control by the operator. When not in use, the display screen or the control switch can be placed on the chassis 1. The present invention has two states. One is as shown in Attachment Figure 1 - Attachment Figure 4 during use, and the other is as shown in Attachment Figure 5 and Attachment Figure 6 when folded and not in use. The following specifically describes the conversion method between the two states: As shown in Attachment Figure 1 - Attachment Figure 4 is the state of the present invention during use. When in use, the driving docking platform 3 is docked with the aircraft. When the present invention needs to be retracted after use: The first step: Remove the platform side rail 21: Taking the platform side rail 21 on one side of the platform frame 20 as an example, first remove the guiding mechanism of the platform side rail 21, as shown in Attachment Figures 13 - 15 , pull out the guiding pin 36, remove the outer guiding seat 34, then remove the screw at the lower end of the side rail column 31, and remove the side rail column 31 from the platform frame 20. Secondly, as shown in Attachment Figure 11 - Attachment Figure 12 , the operator steps on the connecting clamping plate 24 to make the clamping block 28 disengage from the limiting block 29, and then the operator manually pulls out the platform side rail 21 forward. Similarly, remove the platform side rail 21 on the other side of the platform frame 20; The second step: Remove the ladder side rail 67: As shown in Attachment Figure 1 - Attachment Figure 4 , Attachment Figure 24 and Attachment Figure 25 , taking the ladder side rail 67 on one side of the upper ladder 4 as an example, sequentially loosen the locking screws 70 to separate the locking screws 70 from the plugging column 71, and then manually pull out the ladder side rail 67 of the upper ladder 4 upward. Similarly, remove the ladder side rails 67 on the other side of the upper ladder 4, the ladder side rails 67 on both sides of the middle ladder 5, and the ladder side rails 67 on both sides of the second ladder 47; The third step: Retract the retractable support mechanism 81: As shown in Attachment Figure 16 - Attachment Figure 19, pull out the positioning pin 90 connecting the lower ends of the front retractable rod 82 and the rear retractable rod 83 in the retractable support mechanism 81 to the front chassis 7, then respectively pull out the front locking pin 85 on the front retractable rod 82 and the rear locking pin 88 on the rear retractable rod 83. Then retract the front lower support rod 92 of the front retractable rod 82 upward, and rotate the front lower support rod 92 backward so that the front clamping plate 86 of the front lower support rod 92 is clamped on the front guiding limit roller 84. Then retract the rear lower support rod 94 of the rear retractable rod 83 upward, and rotate the rear lower support rod 94 forward so that the rear clamping plate 89 of the rear lower support rod 94 is clamped on the rear guiding limit roller 87. In the present invention, two front retractable rods 82 and two rear retractable rods 83 are provided on the front chassis 7. Place the front retractable rod 82 and the rear retractable rod 83 according to the above steps; Step 4: Retract the upper ladder 4: Start the lifting drive cylinder 75, as shown in the appendix Figure 16 , in this embodiment, two sets of simple support beam groups 74 are provided on the front chassis 7, and correspondingly, two lifting drive cylinders 75 are also provided, corresponding to the simple support beam groups 74 one by one. The upper ladder 4 and the docking platform 3 move downward with the upper frame 10, and the boarding ladder moves downward with the upper frame 10. As the upper frame 10 falls, the distance between the hinge point of the upper end of the front retractable rod 82 and the upper frame 10 and the front guiding limit roller 84 becomes smaller and smaller, the front retractable rod 82 gradually contracts, and the front upper support rod 91 gradually enters the front lower support rod 92. The front retractable rod 82 swings backward until the front retractable rod 82 is in a horizontal state. Similarly, the distance between the rear retractable rod 83 and the rear guiding limit roller 87 also becomes smaller and smaller, the rear retractable rod 83 swings forward and gradually becomes horizontal, the rear retractable rod 83 contracts, and the rear upper support rod 93 gradually enters the rear lower support rod 94. Because the hinge point of the rear retractable rod 83 and the upper frame 10 is lower than the hinge point of the front retractable rod 83 and the upper frame 10, and the rear retractable rod 83 is located at the lower end of the front retractable rod 82, the simple support beam group 74 descends to the lowest point, as shown in the appendix Figure 17 Realize the automatic retraction of the front retractable rod 82 and the rear retractable rod 83, and close the lifting drive cylinder 75, as shown in the appendix Figure 4 and the appendix Figure 28 , during the downward movement of the upper frame 10, the upper frame 10 drives the hanging pin shaft 11 thereon to fall, and the hanging pin shaft 11 disengages from the hanging hook 18. In this way, the upper ladder 4 is separated from the middle ladder 5; Step 5: Separate the front chassis 7 and the rear chassis 1; Pull out the connecting pin shaft between the front connecting seat 15 of the front chassis 7 and the rear connecting seat 14 of the rear chassis 1, and separate the front connecting seat 15 and the rear connecting seat 14 to realize the separation of the front chassis 7 and the rear chassis 1; Step 6: Release the braking of the upper ladder adjusting drive cylinder 12: Start the pawl drive cylinder 103 of the support locking mechanism 101, and the telescopic cylinder of the pawl drive cylinder 103 retracts, so that the pawl 104 is separated from the tooth 102, releasing the locking of the upper ladder adjusting drive cylinder 12. Start the upper ladder adjusting drive cylinder 12, and the telescopic rod of the upper ladder adjusting drive cylinder 12 retracts, and the front end of the upper ladder 4 drives the docking platform 3 to fall, as shown in the appendix Figure 5, close the upper ladder adjustment drive cylinder 12; Step 7: Fold the platform frame 20: As shown in the appendix Figures 7 - 9 , pull out the flipping pin 61 at the lower end of the flipping pedal 59, rotate the flipping pedal 59 backward so that the flipping pedal 59 lands on the rear section 58 of the platform, pull out the connecting pins 56 on the left and right sides of the platform frame 20, and flip the front section 57 of the platform backward so that the rear section 58 of the platform lands on the flipping pedal 59 and the rear section 58 of the platform, as shown in the appendix Figure 10 , pull the hook end at the upper end of the platform limit hook 64 backward so that the hook end of the platform limit hook 64 hooks the platform limit shaft 63, and positionally limit and fix the front section 57 and the rear section 58 of the platform; Step 8: Bend the platform frame 20 downward and retract and fix it: Pull out the support pin shaft connecting the front end of the platform support rod 13 and the docking platform 3. At this time, the platform frame 20 can rotate around its hinge point with the upper ladder 4. Align the retraction pin hole of the platform support rod 13 with the platform pin hole, insert the support pin shaft into the retraction pin hole and the platform pin hole, and positionally limit and fix the platform frame 20 and the upper ladder 4, as shown in the appendix Figure 5 shown to prevent the docking platform 3 from shaking during movement or transportation; Step 9: Retract the middle ladder 5 and the lower ladder 6: After the upper frame 10 drops, the operator manually holds the middle ladder 5 and releases the brakes on the limit plates 40 on both sides of the middle ladder 5. Manually pull down the limit handle 44 to drive the baffle 42 to move downward. The baffle 42 compresses the limit spring 43 downward, and the upper end of the baffle 42 disengages from the limit slot 45 of the limit plate 40. The lower ladder 6 includes a first ladder 46 and a second ladder 47. The operator lifts the second ladder 47 upward. The second ladder 47 rotates upward around the hinge point between the second ladder 47 and the first ladder 46 until the second ladder 47 is in a horizontal state. Push the second ladder 47 forward. The second ladder 47 pushes the first ladder 46 forward. The first ladder 46 rolls forward on the lower track of the rear chassis 1 through the rollers, so that the first ladder 46 and the second ladder 47 land on the rear chassis 1. Then the operator lowers the front part of the middle ladder 5. The rear end of the middle ladder 5 is equipped with rollers that can rotate. The front end of the middle ladder 5 rotates downward around the rollers until the middle ladder 5 is in a horizontal state. Push the middle ladder 5 backward. The rollers are slidably connected to the upper track 17, so that the middle ladder 5 lands above the lower ladder 6, as shown in the appendix Figure 6 , complete the storage of the middle ladder 5 and the lower ladder 6; After the hanging pin 11 and the hanging hook 18 are separated in the fourth step of the present invention or after the front chassis 7 and the rear chassis 1 are separated in the fifth step, if there are more operators, the sixth step and the ninth step can be carried out simultaneously. The above steps can be adjusted according to the number of operators and the actual situation on site, as long as the front and rear chassis 1 can be disassembled and folded properly.

[0077] When in need of use, that is, transform the present invention from the folded state shown in the appendix Figure 5 and the appendix Figure 6 into the state shown in the attached drawings - the attached appendix Figure 4The unfolded usage state is as follows: The first step: Rotate the platform frame 20 to the horizontal state: Pull out the support pin shaft at the front end of the platform support rod 13 from the retracted pin hole and the platform pin hole. The platform frame 20 can rotate upward and forward around the hinge point between it and the upper ladder 4. Rotate the platform frame 20 to the horizontal position so that the support pin hole at the front end of the platform support rod 13 corresponds to the platform pin hole. Insert the support pin shaft through the support pin hole and the platform pin hole to horizontally fix the platform frame 20 at the front end of the upper ladder 4; The second step: Expand the platform frame 20. As shown in Figure 10 , pull the hook end of the platform limit hook 64 backward so that the hook end of the platform limit hook 64 is far from the platform limit shaft 63. The front section 57 of the platform rotates upward and forward until the front section 57 of the platform is in the horizontal state. As shown in Figure 9 , insert the connecting pin 56, rotate the flip pedal 59 upward and forward until the front section of the flip pedal 59 abuts against the front section 57 of the platform, and insert the flip pin 61; The third step: Install the platform side rail 21: Taking the installation of the side rail on one side of the platform frame 20 as an example, first install the guiding mechanism of the platform side rail 21. As shown in Figures 13 - 15 , correspondingly insert the guiding rod at the lower end of the side rail column 31 into the guiding groove of the platform frame 20, fix the side rail column 31 on the platform frame 20 through screws, fix the inner guiding seat 32 on the side rail column 31 through screws, insert the insertion rod 38 of the outer guiding seat 34 into the connecting slot of the inner guiding seat 32, and insert the guiding pin 36 to fix the inner guiding seat 32 and the outer guiding seat 34. As shown in Figure 11 and Figure 12 , press the connecting card plate 24 so that the block 28 is lifted. Push the platform side rail 21 from front to back. The platform guide rail 26 of the platform side rail 21 is sleeved on the platform roller 23. The upper end of the platform side rail 21 passes through the guiding space between the inner roller 33 and the outer roller 35 until the platform side rail 21 moves in place. As shown in Figures 1 - 4 , Figure 7As shown, stop pressing the connecting clamping plate 24 so that the clamping block 28 is clamped between adjacent limiting blocks 29, and fixedly connect the platform side hull 21 and the platform frame 20. Similarly, install the side hull on the other side of the platform frame 20; Fourth step: Connect the front chassis 7 and the rear chassis 1: Move the rear chassis 1 to the rear side of the front chassis 7 so that the front connecting seat 15 and the rear connecting seat 14 face each other, insert the connecting pin shaft, and limit and connect the front connecting seat 15 and the rear connecting seat 14 to realize the connection between the front chassis 7 and the rear chassis 1; Fifth step: Raise the ladder body: Start the lifting driving cylinder 75, and the simply supported beam group 74 rises accordingly, driving the upper frame 10, the upper ladder 4 on the upper frame 10, and the docking platform 3 to rise. As the upper frame 10 rises, the distance between the hinge point of the upper end of the front retractable rod 82 and the upper frame 10 and the front guiding and limiting roller 84 becomes larger and larger, and the front retractable rod 82 gradually extends. The front upper support rod 91 extends out of the front lower support rod 92. The front retractable rod 82 swings forward until the front retractable rod 82 is in a state close to vertical. Similarly, the distance between the rear retractable rod 83 and the rear guiding and limiting roller 87 also becomes larger and larger, and the rear retractable rod 83 swings backward and gradually becomes in a state close to vertical. The rear retractable rod 83 extends, and the rear upper support rod 93 extends out of the rear lower support rod 94. Close the lifting driving cylinder 75, manually remove the front retractable rod 82 from the front guiding and limiting roller 84, pull down the front lower support rod 92 so that the lower end of the front lower support rod 92 is clamped on the insertion rod 88 on one side of the front end of the front chassis 7, insert the positioning pin 90, and at the same time, lock and fix the front lower support rod 92 and the front upper support rod 91 through the front locking pin 85. Manually remove the rear retractable rod 83 from the rear guiding and limiting roller 87, pull down the rear lower support rod 94 so that the lower end of the rear lower support rod 94 is clamped on the insertion rod 88 on one side of the rear end of the front chassis 7, insert the positioning pin 90, and at the same time, lock and fix the rear lower support rod 93 and the rear lower support rod 94 through 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. While the upper frame 10 rises, the hanging pin shaft 11 contacts the hanging hook 18 of the middle ladder 5, and the hanging hook 18 is hung on the hanging pin shaft 11. The front end of the middle ladder 5 rises with the upper frame 10, and the front end of the middle ladder 5 rotates upward through the roller at the rear end of the middle ladder 5 in the lower track 16. Start the upper ladder adjustment driving cylinder 12 to lift the front ends of the docking platform 3 and the upper ladder 4. After the docking platform 3 rises in place, close the upper ladder adjustment driving cylinder 12; Sixth step: Locking of the upper ladder adjustment driving cylinder 12: Start the pawl driving cylinder 103, and the telescopic rod of the pawl driving cylinder 103 extends out so that the pawl contacts the tooth 102 to fix the position of the telescopic rod of the upper ladder adjustment driving cylinder 12;Step 7: Deployment of the second ladder 47: Manually pull the second ladder 47 backward. The second ladder 47 drives the first ladder 46 to move horizontally backward. Then, rotate the second ladder 47 downward. The second ladder 47 rotates downward around its hinge point with the first ladder 46 until the support wheel at the rear end of the second ladder 47 touches the ground. At this time, the baffle 42 of the ladder position limiting connection mechanism 39 at the front end of the first ladder 46 automatically slides into the limit slot 45 of the limit plate 40, limiting and fixing the positions of the first ladder 46 and the second ladder 47. Step 8: Installation of the ladder side panel 67: Taking the installation of the ladder side panel 67 on one side of the upper ladder 4 as an example, as shown in the attachment; Figure 24 and attachment Figure 25 , insert the ladder side panel 67 into the side panel slot 72 of the side panel connection frame 69. The insertion post 71 at the lower end of the ladder side panel 67 is inserted into the insertion hole. Rotate the locking screw 70 so that the front end of the locking screw 70 abuts against the insertion post 71, fixedly connecting the ladder side panel 67 and the side panel connection frame 69. Similarly, install the ladder side panels 67 on the other side of the upper ladder 4, both sides of the middle ladder 5, and both sides of the second ladder 47. Step 9: Tires are provided at the lower ends of the front chassis 7 and the rear chassis 1. The present invention can be manually towed or towed by a tow truck to pick up the plane.

[0078] The present invention has an ingenious structure, a hanging connection, and a ladder body unfolding block. The hanging hook and the hanging pin are used for hanging and hinge connection. The hanging is fast and convenient. Compared with the prior art, there will be no sliding and jamming. Moreover, when not in use, it can be split into two parts. The two parts are folded and assembled separately. The lower end of the upper ladder 4 is matched with the upper end of the middle ladder 5, and the lower end of the middle ladder 5 is matched with the upper end of the second ladder 47 to form the entire ladder body. The ladder stools on the upper ladder 4, the middle ladder 5, and the second ladder 47 are continuous ladder stools from top to bottom. Passengers do not need to adjust their steps when going up and down. In the present invention, the upper track 17 and the lower track 17 are connected. The track 16 can adopt a variable height track, the upper track 17 is from front to back from high to low, and the lower track is from front to back from low to high. The rollers on both sides of the middle ladder 5 are located on the outside of the middle ladder body, and the rollers on both sides of the first ladder 46 are located on the outside of the first ladder body. When the middle ladder 5 rises, from back to front, along with the upper track, the height of the middle ladder 5 gradually increases. When the second ladder is pulled out backward with the first ladder, the height of the front end of the second ladder gradually increases along the lower track, which makes the front end of the second ladder just dock with the lower end of the middle ladder. When the middle ladder 5 and the lower ladder 6 are folded, the method is as above, and the first ladder 46 The ladder body of the middle ladder 5 and the second ladder 47 fall on the frame of the rear chassis, the middle ladder 5 slides backward, and the ladder body height of the middle ladder 5 becomes lower as the roller moves to the rear side of the lower track 17, and the middle ladder 5 falls on the first ladder 46 and the second ladder 47. When the present invention is not in use, it can be split into two parts, both of which can be folded, occupying a small space, convenient for transportation and dragging, and low in transportation cost. Moreover, if a part of it has a problem, only this part can be replaced, and the use cost is low. In addition, the present invention is detachable and foldable, and is very convenient for maintenance. The present invention has a middle ladder 5 and a lower ladder 6. A limit is set between them to avoid the problem of shaking or moving of the lower ladder 6, and the safety is high. The platform side 21 of the present invention is easy to disassemble and replace. Once a problem occurs, the side can be directly replaced without affecting the pick-up operation. Similarly, the ladder side 67 of the present invention can also be disassembled and assembled, and the installation is quick and convenient. In addition, the present invention sets a retractable support mechanism 81 between the front chassis 7 and the upper frame 10. After the upper ladder 4 is raised, the upper frame 10, the upper ladder 4, and the docking platform 3 are supported by the front retractable rod 82 and the rear retractable rod 83. The support is stable and the safety is high.

[0079] The present invention has the advantages of novel structure, hanging connection, fast and smooth ladder body deployment, limited position, good support, high stability, etc. due to the adoption of the above structure.

Claims

1. A quick-connect boarding ladder, comprising a chassis and a ladder body, characterized in that: The trapezoidal body includes a front trapezoidal body and a rear trapezoidal body. A front trapezoidal body lifting support mechanism is provided between the front trapezoidal body and the chassis. The front trapezoidal body is driven by the front trapezoidal body lifting support mechanism. A hanging mechanism is provided between the front trapezoidal body lifting support mechanism and the rear trapezoidal body. The front end of the rear trapezoidal body is connected to the front trapezoidal body lifting support mechanism through the hanging mechanism. The rear trapezoidal body is movably connected to the chassis.

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

3. The quick-connect boarding ladder according to claim 2, wherein: The rear trapezoidal body includes an intermediate ladder and a lower ladder. Upper tracks are provided on both sides at the rear end of the chassis. The upper tracks are fixedly connected to the vehicle frame of the chassis. Hanging hooks are fixedly provided on both sides at the upper end of the intermediate ladder. Rollers are installed on both sides at the lower end of the intermediate ladder. The lower end of the intermediate ladder is movably connected to the upper tracks of the chassis through the rollers. The upper end of the lower ladder is butted against the intermediate ladder, and the upper end of the lower ladder is hinged to the vehicle frame of the chassis.

4. A quick-connect boarding ladder according to claim 2 or 3, characterized in that: A docking platform is provided at the front end of the upper ladder. The front end of the upper ladder is hinged to the rear end of the docking platform. A platform support rod is provided between the upper ladder and the docking platform. The front end of the platform support rod is hinged to the docking platform, and the rear end is hinged to the upper ladder.

5. A rapid connection boarding ladder according to claim 4, characterized in that: The docking platform includes a platform frame and platform sidewalls. Platform sidewalls are provided on the left and right sides of the platform frame. A platform sidewall connection mechanism is provided between the platform sidewalls and the platform frame.

6. A quick - connecting boarding ladder according to claim 5, characterized in that: The platform sidewall connection mechanism includes platform rollers, connection clamping plates, compression springs, platform guide rails, and limit connection plates. Platform rollers are provided on the left side of the platform frame from front to back, and platform rollers are provided on the right side of the platform frame from front to back. The platform rollers are installed on a platform shaft through bearings, and the platform shaft is fixed to the platform frame. Connection clamping plates are provided on the left and right sides of the platform frame. One end of the connection clamping plate is fixedly connected to the platform frame through a compression spring, and the other end extends outward and downward to form a clamping block. A platform guide rail is provided at the lower end of the platform sidewall. The platform guide rail is fixedly connected to the platform sidewall. The platform guide rail is matched with the platform rollers. The platform sidewall is slidably connected to the platform frame through the platform guide rail and the platform rollers. A limit connection plate is provided on the platform guide rail. One side of the limit connection plate is fixedly connected to the platform sidewall, and the other side is provided with limit blocks at intervals from front to back. The clamping block is inserted between adjacent limit blocks to fixedly connect the platform sidewall to the platform frame.

7. A quick-connect boarding ladder according to claim 5 or 6, characterized in that: A platform sidewall guiding mechanism is provided on the platform frame.

8. A quick-connect boarding ladder according to claim 7, characterized in that: The side hull guiding mechanism of the platform includes side hull columns, inner guiding seats, inner rollers, outer guiding seats, and outer rollers. There are side hull columns inside the side hull of the platform. The lower ends of the side hull columns are fixedly connected to the platform frame. Inner guiding seats are provided on the side hull columns. The inner guiding seats are fixedly connected to the side hull columns. Inner rollers are installed on the inner guiding seats. Outer guiding seats are provided on the inner guiding seats. The outer guiding seats are fixedly connected to the inner guiding seats. Outer rollers are installed on the outer guiding seats. The inner rollers cooperate with the outer rollers. One side of the side hull of the platform abuts against the inner rollers, and the other side abuts against the outer rollers.

9. A quick-connect boarding ladder according to claim 8, characterized in that: The inner guiding seat is provided with a connecting slot, and the connecting slot is provided with a slot pin hole. The inner roller is installed on the inner roller shaft. The upper and lower ends of the inner roller shaft are fixedly connected to the inner guiding seat. The outer guiding seat is provided with a plug rod. The upper end of the plug rod is fixedly connected to the outer guiding seat. The plug rod is provided with a plug rod pin hole. The plug rod is inserted into the connecting slot, and a guiding pin passes through the slot pin hole and the plug rod pin hole to fixedly connect the plug rod and the inner guiding seat. The outer roller is sleeved on the outer roller shaft. The upper and lower ends of the outer roller shaft are fixedly connected to the outer guiding seat.

10. A quick-connect boarding ladder according to claim 8 or 9, characterized in that: A guiding rod is provided at the lower end of the side hull column. A threaded hole is provided at the lower end of the side hull column. A guiding groove is provided on the platform frame. The upper end of the guiding rod is fixedly connected to the side hull column, and the lower end is inserted into the guiding groove. The side hull column is threadedly connected to the platform frame by screws.

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

12. A quick-connect boarding ladder according to claim 11, characterized in that: The baffle includes an upper baffle section and a lower baffle section. The upper end of the upper baffle section cooperates with the limit slot. The lower end of the upper baffle section is fixedly connected to the lower baffle section. The outer diameter of the upper baffle section is larger than the outer diameter of the lower baffle section. The limit spring is sleeved on the lower baffle section. The upper end of the limit spring abuts against the lower end face of the upper baffle section, and the lower end abuts against the ladder limit fixing seat. The outer diameter of the limit handle is larger than the inner diameter of the limit through hole.

13. A quick-connect boarding ladder according to claim 11 or 12, characterized in that: The lower ladder includes a first ladder and a second ladder. Lower rails are provided on both sides of the rear end of the chassis. The lower rails are located below the upper rails and are fixedly connected to the frame of the chassis. Rollers are respectively installed on both sides of the first ladder. The first ladder is slidably connected to the lower rails via the rollers. The rear end of the first ladder is hinged to the front end of the second ladder. Ladder limit fixing seats are provided on both sides of the front end of the first ladder, and the ladder limit fixing seats are fixedly connected to the first ladder.

14. A quick-connect boarding ladder according to claim 5 or 6 or 8 or 9 or 11 or 12, characterized in that: A platform foldable connection mechanism is provided on the platform frame. The platform frame includes a front section of the platform and a rear section of the platform. The front section of the platform is connected to the rear section of the platform via the platform foldable connection mechanism.

15. A rapid connection boarding ladder according to claim 14, characterized in that: The platform foldable connection mechanism includes a front hinge block, a hinge connecting plate, a front connecting block, a rear hinge block, a rear connecting block, and a connecting pin. A front hinge block is provided at the rear end of the front section of the platform. The front end of the front hinge block is fixedly connected to the front section of the platform, and a hinge shaft hole is provided at the rear end. Hinge connecting plates are provided on both sides of the front hinge block. A front connecting block is provided at the lower end of the front hinge block, and the front connecting block is fixedly connected to the front hinge block. A front connecting pin hole extends rearward from the rear end of the front connecting block. A rear hinge block is provided at the front end of the rear section of the platform. A hinge shaft hole is provided at the front end of the rear hinge block, and the rear end is fixedly connected to the rear section of the platform. A rear connecting block is provided at the lower end of the rear hinge block, and the rear connecting block is fixedly connected to the rear hinge block. A rear connecting pin hole extends forward from the front end of the rear connecting block. The front end of the hinge connecting plate is hinged to the front hinge block via a front hinge shaft, and the rear end is hinged to the rear hinge block via a rear hinge shaft. The rear end of the front connecting block and the front end of the rear connecting block face each other. The front connecting block and the rear connecting block are fixedly connected via a connecting pin, a front connecting pin hole, and a rear connecting pin hole.

16. A rapid connection boarding ladder according to claim 15, characterized in that: A flip pedal is provided between the front section of the platform and the rear section of the platform. The front end face of the flip pedal abuts against the rear end face of the front section of the platform, and the rear end face abuts against the front end face of the rear section of the platform. The rear end of the flip pedal is hinged to the rear section of the platform. A flip connecting block is provided on the lower end face of the flip pedal, and the flip connecting block is fixedly connected to the flip pedal. A flip pin hole is provided on the flip connecting block. A flip connecting pin hole is provided on the rear end face of the front section of the platform. A flip pin passes through the flip pin hole and the flip connecting pin hole to fixedly connect the flip connecting block to the front section of the platform.

17. A rapid-hooking boarding ladder according to claim 16, characterized in that: A platform folding limit mechanism is provided between the front section of the platform and the rear section of the platform.

18. A quick-connect boarding ladder according to claim 17, wherein: The platform folding limit mechanism includes a platform limit shaft, a platform limit hook, a hook pin shaft, and a torsion spring. At least one side of the front section of the platform is provided with a platform limit shaft, and the platform limit shaft is fixedly connected to the front section of the platform. At least one side of the rear section of the platform is provided with a platform limit hook. The platform limit hook is hinged to the rear section of the platform via the hook pin shaft. A torsion spring is sleeved on the hook pin shaft. The platform limit hook is limit-connected to the rear section of the platform via the torsion spring. When the front section of the platform and the rear section of the platform are folded, the platform limit hook hooks the platform limit shaft to limit-connect the front section of the platform and the rear section of the platform.

19. A quick - connect boarding ladder according to any one of claims 1 - 3, 5 - 6, 8 - 9, 11 - 12, 15 - 18, characterized in that: Ladder side hulls are provided on both sides of the ladder body, and a ladder side hull quick connection mechanism is provided at the lower end of the ladder side hull.

20. A quick-connect boarding ladder according to claim 19, characterized in that: The trapezoidal body side hull quick connection mechanism includes a side hull connection frame, a locking screw, and a plugging column. Side hull connection frames are fixedly arranged on both sides of the trapezoidal body. A side hull card slot is arranged at the upper end of the side hull connection frame. Plugging holes are arranged at intervals on the side hull connection frame. A locking hole is arranged on the side of the plugging hole, and the locking hole communicates with the plugging hole. A locking screw is arranged in the locking hole. Plugging columns are arranged at intervals at the lower end of the trapezoidal body side hull. The upper end of the plugging column is fixedly connected to the trapezoidal body side hull. The outer diameter of the upper end of the plugging column matches the inner diameter of the plugging hole. The outer diameter of the upper part of the plugging column is larger than the outer diameter of the lower part of the plugging column. The lower end of the trapezoidal body side hull is snapped into the side hull card slot, the plugging column is inserted into the plugging hole, the locking screw passes through the locking hole and abuts against the plugging column, and the locking screw is threadedly connected to the side hull connection frame to fixedly connect the trapezoidal body side hull and the side hull connection frame.

21. A rapid connection boarding ladder according to any one of claims 2-3, 5-6, 8-9, 11-12, 15-18, characterized in that: The trapezoidal body lifting mechanism includes a simple support beam group and a lifting drive cylinder. Simple support beam groups are symmetrically arranged on the left and right sides at the front of the chassis. The simple support beam group includes an outer lower simple support beam, an inner lower simple support beam, an outer upper simple support beam, and an inner upper simple support beam. Lifting guide rails are fixedly arranged on both sides of the frame of the chassis. The outer lower simple support beam and the inner lower simple support beam are arranged on the frame of the chassis. A roller is installed at the lower end of the outer lower simple support beam. The outer lower simple support beam is slidably connected to the frame of the chassis through the roller and the lifting guide rail. The middle part of the outer lower simple support beam is hinged to the inner lower simple support beam on the same side. The outer upper simple support beam is arranged at the upper end of the outer lower simple support beam. The lower end of the inner lower simple support beam is hinged to the frame of the chassis, and the inner upper simple support beam is arranged at the upper end. The lower end of the outer upper simple support beam is hinged to the outer lower simple support beam. The middle part of the outer upper simple support beam is hinged to the inner upper simple support beam on the same side. A roller is arranged at the upper end of the outer upper simple support beam. The lower end of the inner upper simple support beam is hinged to the inner lower simple support beam, and the upper end is hinged to the upper frame. Frame guide rails are fixedly arranged on both sides of the upper frame. The outer upper simple support beam is slidably connected to the upper frame through the roller and the frame guide rail. A lifting drive cylinder is arranged between the inner upper simple support beam and the inner lower simple support beam. One end of the lifting drive cylinder is hinged to the inner upper simple support beam, and the other end is hinged to the inner lower simple support beam.

22. A rapid boarding ladder according to claim 21, wherein: A retracting and extending support mechanism is arranged between the chassis and the upper frame.

23. A quick-connect boarding ladder according to claim 22, characterized in that: The retracting and extending support mechanism includes a front retracting and extending rod and a rear retracting and extending rod. Front retracting and extending rods are respectively arranged on both sides at the front end of the upper frame, and rear retracting and extending rods are respectively arranged on both sides at the rear end of the upper frame. The front retracting and extending rod and the rear retracting and extending rod are respectively telescopic rods. The upper end of the front retracting and extending rod is hinged to the upper frame, and the lower end is detachably connected to the chassis. The upper end of the rear retracting and extending rod is hinged to the upper frame, and the lower end is detachably connected to the chassis.

24. A rapid-connect boarding ladder according to claim 23, characterized in that: On the inner upper simply supported beam on the same side of the front retractable rod, there are front guiding and limiting rollers. The front retractable rod includes a front upper support rod and a front lower support rod. The upper end of the front upper support rod is hinged to the upper frame, and the lower end is inserted into the front lower support rod. The front upper support rod is slidably connected to the front lower support rod. There is a front upper pin hole in the lower part of the front upper support rod, and a front lower pin hole in the upper part of the front lower support rod. The lower end of the front lower support rod is detachably connected to the chassis. The front upper support rod is fixedly connected to the front lower support rod through a front locking pin, the front upper pin hole, and the front lower pin hole. There is a front clamping plate on the side wall of the front lower support rod. The front clamping plate is fixedly connected to the front lower support rod. There is a clamping groove on the front clamping plate. The front guiding and limiting roller is placed in the clamping groove of the front clamping plate. The front guiding and limiting roller abuts against the front clamping plate to limit the front lower support rod on the inner upper simply supported beam. On the outer lower simply supported beam on the same side of the rear retractable rod, there are rear guiding and limiting rollers. The rear retractable rod includes a rear upper support rod and a rear lower support rod. The upper end of the rear upper support rod is hinged to the upper frame, and the lower end is inserted into the rear lower support rod. The rear upper support rod is slidably connected to the rear lower support rod. There is a rear upper pin hole in the lower part of the rear upper support rod, and a rear lower pin hole in the upper part of the rear lower support rod. The lower end of the rear lower support rod is detachably connected to the chassis. The rear upper support rod is fixedly connected to the rear lower support rod through a rear locking pin, the rear upper pin hole, and the rear lower pin hole. There is a rear clamping plate on the side wall of the rear lower support rod. The rear clamping plate is fixedly connected to the rear lower support rod. There is a clamping groove on the rear clamping plate. The rear guiding and limiting roller is placed in the clamping groove of the rear clamping plate. The rear guiding and limiting roller abuts against the rear clamping plate to limit the rear lower support rod on the outer lower simply supported beam.

25. A quick-connect boarding ladder according to claim 24, characterized in that: There is a connecting groove at the lower end of the front lower support rod, and a connecting groove at the lower end of the rear lower support rod. There is a connecting pin hole on the connecting groove. There is an inserting rod on the vehicle frame of the chassis. The lower end of the inserting rod is fixedly connected to the vehicle frame of the chassis. There is a positioning pin hole on the inserting rod. The inserting rod is inserted into the connecting groove. The positioning pin passes through the connecting pin hole and the positioning pin hole to fixedly connect the front lower support rod or the rear lower support rod to the inserting rod.

26. A quick-connect boarding ladder according to claim 21, characterized in that: There is a frame automatic height measuring mechanism on the ladder lifting mechanism. The frame automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. There is an induction frame between the inner upper simply supported beam and the inner lower simply supported beam. There is an induction groove on the induction frame. The upper end of the induction plate is hinged to the inner upper simply supported beam. The induction plate is placed in the induction groove and is slidably connected to the induction frame. There are induction holes on the induction plate at intervals along the sliding direction of the induction plate. There is an inductor at the upper end of the induction groove, and the lower end is hinged to the inner lower simply supported beam. The inductor is fixedly connected to the induction frame. The inductor cooperates with the induction holes for induction.

27. A quick - connecting boarding ladder according to any one of claims 2 - 3, 5 - 6, 8 - 9, 11 - 12, 15 - 18, 22 - 26, characterized in that: An upper ladder automatic height measuring mechanism is provided between the upper frame and the upper ladder. The upper ladder automatic height measuring mechanism includes an induction frame, an induction plate, and an inductor. The induction frame is provided on the upper frame. An induction groove is provided on the induction frame. The induction plate is provided in the induction groove. The lower end of the induction frame is hinged to the upper frame. The induction plate is slidably connected to the induction frame. The upper end of the induction plate is hinged to the upper ladder. Induction holes are provided at intervals along the sliding direction of the induction plate on the induction plate. The inductor is provided at the upper end of the induction groove. The inductor is fixedly connected to the induction frame. The inductor cooperates with the induction holes for induction.

28. A quick - connecting boarding ladder according to any one of claims 2 - 3, 5 - 6, 8 - 9, 11 - 12, 15 - 18, 22 - 26, characterized in that: A support locking mechanism is provided on the upper ladder adjusting drive cylinder. The support locking mechanism includes teeth, a pawl drive cylinder, and a pawl. Teeth are fixedly provided on the rod wall of the telescopic rod of the upper ladder adjusting drive cylinder. The pawl drive cylinder is provided on the cylinder seat of the upper ladder adjusting drive cylinder. The telescopic rod of the pawl drive cylinder is fixedly connected with a pawl. The pawl cooperates with the teeth to lock the position of the telescopic rod of the upper ladder adjusting drive cylinder.

29. A rapid connection boarding ladder according to claim 28, characterized in that: A pawl clamping mechanism is provided on the pawl drive cylinder. The pawl clamping mechanism includes a clamping adjustment plate, a first pin shaft, a second pin shaft, a clamping spring, a pawl shaft connecting plate, and a pawl shaft. The telescopic rod of the pawl drive cylinder is provided with a clamping adjustment plate. One end of the clamping adjustment plate is provided with a first pin shaft, and the other end is provided with a second pin shaft. Clamping springs are provided on both sides of the clamping adjustment plate. One end of the clamping adjustment plate is provided with a shaft hole, and the other end is provided with a long hole. The clamping adjustment plate is hinged to the telescopic rod of the pawl drive cylinder through the first pin shaft. The second pin shaft passes through the long hole. Pawl shaft connecting plates are provided at both ends of the second pin shaft. One end of the pawl shaft connecting plate is fixedly connected to the second pin shaft, and the other end is fixedly connected to the pawl shaft. The pawl is fixedly arranged on the pawl shaft. One end of the clamping spring is connected to the first pin shaft, and the other end is connected to the second pin shaft.

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