Method of using a boarding bridge support device

Abstract

The present application relates to the technical field of boarding stairs, and particularly discloses a boarding stairs supporting device and a use method thereof, which comprises a boarding stairs supporting device placing and supporting method, and has the following steps: first, a lifting driving cylinder of a lifting mechanism is started, and the lifting driving cylinder moves the upper frame upward; with the upward movement of the upper frame, a front retractable rod swings downward and forward until the front retractable rod is in a nearly vertical state, and meanwhile, a rear retractable rod swings backward and gradually becomes in a nearly vertical state; second, a front clamping plate of the front retractable rod is removed from a front guide limiting roller, a front lower supporting rod of the front retractable rod is pulled downward, the lower end of the front lower supporting rod is inserted and fixed with a bottom plate, and a front upper supporting rod and the front lower supporting rod are locked and fixed; a rear clamping plate of the rear retractable rod is removed from a rear guide limiting roller, a rear lower supporting rod is inserted and fixed with the bottom plate at the lower end, and a rear upper supporting rod and the rear lower supporting rod are locked and fixed; the present application has good supporting performance, high stability, and convenient retraction and placement.

Description

Technical Field

[0001] This invention relates to the field of boarding ladder technology, specifically to a method of using a boarding ladder support device. Background Technology

[0002] Boarding stairs are mainly used for crew members to board and disembark from aircraft and are one of the essential safety equipment for aircraft. Boarding stairs are driven by a lifting mechanism mounted on a chassis. A search revealed Chinese patent CN113277110A, which discloses a passenger boarding stairs, including a chassis and an inclined fixed ladder. One end of the chassis is hinged to a support frame extending upwards at the other end. A drive assembly is provided on the upper side of the chassis to drive the support frame to swing around the hinge point between it and the chassis. A sliding ladder that can reciprocate along its length is connected to the support frame. The fixed ladder is arranged in the same direction as the sliding ladder, with its lower end hinged to the support frame and its upper end resting on the sliding ladder. The shortcomings of this patent are: in this patent, the support frame is driven by a drive assembly, and the sliding ladder slides along the support frame. The sliding ladder lacks support, making it prone to swaying and instability during sliding. Furthermore, a docking platform is connected to the front end of the sliding ladder, which may cause wobbling when users step on the sliding ladder and docking platform, resulting in poor overall structural stability. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a method for using a boarding ladder support device that is ingeniously structured, provides good support, has high stability, and is quick and easy to install.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for using a boarding ladder support device includes a method for lowering and supporting the boarding ladder support device, the steps of which are as follows:

[0006] Step 1: In the initial state, the front retractable rod and the rear retractable rod of the boarding ladder support device are retracted. Both the front retractable rod and the rear retractable rod are in a horizontal state. One end of the front retractable rod is hinged to the upper frame and is connected to the lifting mechanism. One end of the rear retractable rod is hinged to the upper frame and is connected to the lifting mechanism.

[0007] Step 2: Activate the lifting drive cylinder of the lifting mechanism. The telescopic rod of the lifting drive cylinder extends, and the lifting drive cylinder moves the upper frame upward. As the upper frame moves upward, the distance between the hinge point between the upper end of the front retractable rod and the upper frame and the front guide limit roller on the lifting mechanism increases. The front retractable rod gradually extends, and the front upper support rod extends out from the front lower support rod. The front retractable rod swings downward and forward until it is nearly vertical. At the same time, the distance between the rear retractable rod and the rear guide limit roller also increases. The rear retractable rod gradually extends, and the rear upper support rod extends out from the rear lower support rod. The rear retractable rod swings downward and backward until it is nearly vertical. Then, close the lifting drive cylinder.

[0008] Step 3: Remove the front retaining plate of the front retractable lever from the front guide limiting roller, pull down the front lower support rod of the front retractable lever so that the front upper support rod and the front lower support rod are in a vertical state, and insert the lower end of the front lower support rod into the chassis for fixation, and lock the front upper support rod and the front lower support rod for fixation; remove the rear retaining plate of the rear retractable lever from the rear guide limiting roller, pull down the rear lower support rod so that the rear upper support rod and the rear lower support rod are in a vertical state, and insert the lower end of the rear lower support rod into the chassis for fixation, and lock the rear upper support rod and the rear lower support rod for fixation;

[0009] In the third step of this invention, the lower end of the front lower support rod is fitted onto the corresponding plug-in rod on the chassis, and a positioning pin is inserted to limit and fix the front lower support rod to the chassis. A front locking pin is inserted between the front lower support rod and the front upper support rod to lock and fix it. The lower end of the rear lower support rod is fitted onto the corresponding plug-in rod on the chassis, and a positioning pin is inserted to limit and fix the rear lower support rod to the chassis. A rear locking pin is inserted between the rear upper support rod and the rear lower support rod to lock and fix it.

[0010] The method for using the boarding ladder support device of the present invention also includes a method for retracting the boarding ladder support device, the steps of which are as follows:

[0011] Step 1: In the initial state, the front and rear retractable rods of the boarding ladder support device are both in a vertical support state. Release the connection between the front and rear retractable rods and the chassis, and release the locking and fixing of the front and rear retractable rods.

[0012] Step 2: Retract the lower front support rod of the front retracting rod upwards, and rotate the lower front support rod backwards so that the front locking plate of the lower front support rod is locked on the front guide limit roller of the lifting mechanism. Then retract the lower rear support rod of the rear retracting rod upwards, and rotate the lower rear support rod forwards so that the rear locking plate of the lower rear support rod is locked on the rear guide limit roller of the lifting mechanism.

[0013] Step 3: Activate the lifting drive cylinder. The telescopic rod of the lifting drive cylinder retracts, causing the upper frame to move downwards. As the upper frame moves downwards, the distance between the hinge point between the upper end of the front retractable rod and the upper frame and the front guide limit roller decreases. The front retractable rod gradually retracts, and the front upper support rod gradually enters the front lower support rod. The front retractable rod gradually swings backwards and upwards until it becomes horizontal. Simultaneously, as the upper frame moves downwards, the distance between the rear retractable rod and the rear guide limit roller also decreases. The rear retractable rod gradually retracts, and the rear upper support rod gradually enters the rear lower support rod. The rear retractable rod gradually swings forwards and upwards until it becomes horizontal. At this point, the lifting mechanism descends to its lowest point, the front retractable rod rests horizontally on the rear retractable rod, the lifting drive cylinder is closed, and the retraction of the boarding ladder support device is completed.

[0014] In step one of the present invention, the positioning pins at the lower ends of the front retractable lever and the rear retractable lever are removed respectively, and then the front locking pin on the front retractable lever and the rear locking pin on the rear retractable lever are removed respectively.

[0015] Due to the above-mentioned structure, the present invention has the advantages of ingenious structure, good support, high stability, and quick and convenient installation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the front and rear retractable levers of the present invention after they are fully retracted.

[0018] Figure 3 This is a schematic diagram showing the state of the front and rear retractable rods of the present invention as they rise and fall with the lifting mechanism.

[0019] Figure 4 This is an enlarged schematic diagram of the simply supported beam assembly in this invention.

[0020] Figure 5 This is a schematic diagram showing the state when the present invention is in use.

[0021] Reference numerals: Chassis 7, Lifting mechanism 9, Upper frame 10, Simply supported beam assembly 74, Lifting drive cylinder 75, Outer lower simply supported beam 76, Inner lower simply supported beam 77, Outer upper simply supported beam 78, Inner upper simply supported beam 79, Connecting beam 80, Retraction support mechanism 81, Front retraction rod 82, Rear retraction rod 83, Front guide limit roller 84, Front locking pin 85, Front clamping plate 86, Rear guide limit roller 87, Insertion 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. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0023] A boarding ladder support device includes a chassis 7 and a lifting mechanism 9, characterized in that: a retractable support mechanism 81 is provided on the chassis 7, an upper frame 10 is provided above the chassis 7, the lower end of the lifting mechanism 9 is connected to the chassis 7, and the upper end is connected to the upper frame 10; the retractable support mechanism 81 includes a front retractable rod 82 and a rear retractable rod 83; 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 retractable rods 82 and the rear retractable rods 83 are telescopic rods; a front retractable rod 82 is connected to the lifting mechanism 9. A hooking mechanism is provided between the rear retractable rod 83 and the lifting mechanism 9. The front retractable rod 82 and the rear retractable rod 83 are driven to extend and retract via the lifting mechanism 9. The upper end of the front retractable rod 82 is hinged to the upper frame 10, and the lower end is detachably connected to the chassis 7. The upper end of the rear retractable rod 83 is hinged to the upper frame 10, and the lower end is detachably connected to the chassis 7, so as to facilitate the separation of the front retractable rod and the rear retractable rod from the chassis. The front retractable rod and the rear retractable rod are automatically extended and retracted by the lifting mechanism, which facilitates the extension and retraction of the front retractable rod and the rear retractable rod. At the same time, the front retractable rod and the rear retractable rod are connected to the chassis, and the upper frame provides stable support.

[0024] The lifting mechanism 9 of the present invention includes a simply supported beam assembly 74 and a lifting drive cylinder 75. The simply supported beam assembly 74 is symmetrically arranged on both sides of the chassis 7. The simply supported beam assembly 74 includes an outer lower simply supported beam 76, an inner lower simply supported beam 77, an outer upper simply supported beam 78, and an inner upper simply supported beam 79. Lifting guide rails are fixedly arranged on both sides of the chassis 7 frame. The outer lower simply supported beam 76 and the inner lower simply supported beam 77 are arranged on the chassis 7 frame. The lower end of the outer lower simply supported beam 76 is mounted with... The outer lower simply supported beam 76 is slidably connected to the chassis 7 via rollers and lifting guide rails. The middle portion of the outer lower simply supported beam 76 is hinged to the inner lower simply supported beam 77 on the same side. An outer upper simply supported beam 78 is provided at the upper end of the outer lower simply supported beam 76. The lower end of the inner lower simply supported beam 77 is hinged to the frame of the chassis 7, and an inner upper simply supported beam 79 is provided at its upper end. The lower end of the outer upper simply supported beam 78 is hinged to the outer lower simply supported beam 76, and the middle portion of the outer upper simply supported beam 78 is hinged to the inner lower simply supported beam 77 on the same side. The inner upper simply supported beam 79 is hinged to the side, and the upper end of the outer upper simply supported beam 78 is provided with a roller. The lower end of the inner upper simply supported beam 79 is hinged to the inner lower simply supported beam 77, and the upper end is hinged to the upper frame 10. Frame guide rails are fixed on both sides of the upper frame 10. The outer upper simply supported beam 78 is slidably connected to the upper frame 10 via the roller and frame guide rails. A connecting beam 80 connects the two outer lower simply supported beams 76 on both sides of the chassis 7, and the two inner lower simply supported beams 77 are connected... A connecting beam 80 is provided between the two outer upper simply supported beams 78 and between the two inner upper simply supported beams 79, so as to realize the synchronous lifting and lowering of the two sets of simply supported beams. A lifting drive cylinder 75 is provided between the inner upper simply supported beam 79 and the inner lower simply supported beam 77. One end of the lifting drive cylinder 75 is hinged to the inner upper simply supported beam 79 and the other end is hinged to the inner lower simply supported beam 77, so as to facilitate the lifting and lowering of the simply supported beam group by the lifting drive cylinder.

[0025] The front mounting mechanism of the present invention includes a front guide limiting roller 84, a front locking pin 85, and a front locking plate 86.

[0026] A front guide limiting roller 84 is provided on the inner upper simply supported beam 79 on the same side as 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 and the front lower support rod 92 are slidably connected. The lower part of the front upper support rod 91 is provided with a front upper pin hole, and the upper part of the front lower support rod 92 is provided with a front lower pin hole. The front upper support rod 91 is fixedly connected to the front lower support rod 92 via a front locking pin 85, a front upper pin hole, and a front lower pin hole, so that the front upper support rod moves with the upper frame. After the frame is raised, the upper front support rod is pulled out from the lower front support rod and the positions of the upper front support rod and the lower front support rod are fixed by the front locking pin. The lower front support rod 92 has a front clamping plate 86 on its side wall. The front clamping plate 86 is fixedly connected to the lower front support rod 92. The front clamping plate 86 has a clamping groove. The front guide limiting roller 84 is placed in the clamping groove of the front clamping plate 86. The front guide limiting roller 84 abuts against the front clamping plate 86 to limit the lower front support rod 92 on the inner upper simply supported beam 79, so as to facilitate the lifting and lowering of the inner upper simply supported beam through the lifting mechanism, thereby realizing the automatic extension and retraction of the front extension rod.

[0027] The rear attachment mechanism of this invention includes a rear guide limiting roller 87, a rear locking pin, and a rear locking plate 89. The rear guide limiting roller 87 is provided on the outer lower simply supported beam 76 on the same side as the rear retraction rod 83. The rear retraction rod 83 includes a rear upper support rod 93 and a rear lower support rod 94. The upper end of the rear upper support rod 93 is hinged to the upper frame 10, and the lower end is inserted into the rear lower support rod 94. The rear upper support rod 93 and the rear lower support rod 94 are slidably connected. The lower part of the rear upper support rod 93 has a rear upper pin hole, and the upper part of the rear lower support rod 94 has a rear lower pin hole. The rear upper support rod 93 is connected to the rear lower support rod 94 via the rear locking pin, the rear upper pin hole, and the rear lower pin hole. 4. Fixed connection: After the upper rear support rod rises with the upper frame and is pulled out from the lower rear support rod into place, the positions of the upper rear support rod and the lower rear support rod are fixed by the rear locking pin. The lower rear support rod 94 is provided with a rear clamping plate 89 on its side wall. The rear clamping plate 89 is fixedly connected to the lower rear support rod 94. The rear clamping plate 89 is provided with a clamping groove. The rear guide limiting roller 87 is placed in the clamping groove of the rear clamping plate 89. The rear guide limiting roller 87 abuts against the rear clamping plate 89 to limit the lower rear support rod 94 on the outer lower simply supported beam 76, so as to facilitate the automatic extension and retraction of the rear retraction rod by driving the outer lower simply supported beam to rise and fall through the lifting mechanism.

[0028] The lower end of the front lower support rod 92 and the lower end of the rear lower support rod 94 are provided with a connecting groove. The connecting groove is provided with a connecting pin hole. The chassis 7 is provided with a plug rod 88. The lower end of the plug rod 88 is fixedly connected to the chassis 7. The plug rod 88 cooperates with the connecting groove. The plug rod 88 is provided with a positioning pin hole. The plug rod 88 is inserted into the connecting groove. The positioning pin 90 passes through the connecting pin hole and the positioning pin hole to fix the front lower support rod or the rear lower support rod to the plug rod 88. When the lifting mechanism raises the upper frame, the front lower support rod is removed from the front guide limit roller, and the lower end of the front lower support rod is inserted into the plug rod. 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.

[0029] The hinge point between the front upper support rod 91 and the upper frame 10 is higher than the hinge point between the rear upper support rod 93 and the upper frame 10, so that when folding up, the front retractable rod is placed on top of the rear retractable rod.

[0030] A method for using a boarding ladder support device includes the boarding ladder support device, which has two states: retracted and extended. The method for retracting the boarding ladder support device includes the following steps:

[0031] Step 1: As attached Figure 1 Remove the positioning pins 90 at the lower ends of the front retractable lever 82 and the rear retractable lever 83 respectively, and then remove the front locking pin 85 on the front retractable lever 82 and the rear locking pin 88 on the rear retractable lever 83 respectively.

[0032] Step 2: Retract the front lower support rod 92 of the front retracting rod 82 upwards, and rotate the front lower support rod 92 backwards so that the front locking plate 86 of the front lower support rod 92 is locked on the front guide limit roller 84 of the lifting mechanism 9. Then retract the rear lower support rod 94 of the rear retracting rod 83 upwards, and rotate the rear lower support rod 94 forwards so that the rear locking plate 89 of the rear lower support rod 94 is locked on the rear guide limit roller 87 of the lifting mechanism 9.

[0033] Step 3: Activate the lifting drive cylinder 75. The telescopic rod of the lifting drive cylinder 75 retracts, causing the upper frame 10 to move downwards. As the upper frame 10 moves downwards, the distance between the hinge point between the upper end of the front retractable rod 82 and the upper frame 10 and the front guide limit roller 84 decreases. The front retractable rod 82 gradually retracts, and the front upper support rod 91 gradually enters the front lower support rod 92. The front retractable rod 82 gradually swings backwards and upwards until it becomes horizontal. Simultaneously, as the upper frame 10 moves downwards, the distance between the rear retractable rod 83 and the rear guide limit roller 87 also decreases. The rear retractable rod 83 gradually retracts, and the rear upper support rod 93 gradually enters the rear lower support rod 94. The rear retractable rod 83 gradually swings forwards and upwards until it becomes horizontal. At this point, the lifting mechanism 9 descends to its lowest point, and the front retractable rod 82 is placed horizontally on the rear retractable rod 83. Close the lifting drive cylinder 75 to complete the retraction of the boarding ladder support device. (See attached diagram) Figure 2 ;

[0034] The method for lowering the support device of the boarding ladder includes the following steps:

[0035] Step 1: As attached Figure 2 The lifting drive cylinder 75 is activated, and the lifting drive cylinder 75 moves the upper frame 10 upward. As the upper frame 10 moves upward, the distance between the hinge point between the upper end of the front retractable lever 82 and the upper frame 10 and the front guide limit roller 84 increases. The front retractable lever 82 gradually extends, and the front upper support rod 91 extends out from the front lower support rod 92. The front retractable lever 82 swings downward and forward until it is nearly vertical. At the same time, the distance between the rear retractable lever 83 and the rear guide limit roller 87 also increases. The rear retractable lever 83 gradually extends, and the rear upper support rod 93 extends out from the rear lower support rod 94. The rear retractable lever 83 swings downward and backward until it is nearly vertical. The lifting drive cylinder 75 is then deactivated.

[0036] Step 2: Remove the front locking plate 86 of the front retractable lever 82 from the front guide limiting roller 84, pull down the front lower support rod 92 of the front retractable lever 82 so that the lower end of the front lower support rod 92 is fitted onto the corresponding plug-in rod 88 on the chassis 7, insert the positioning pin 90, and limit and fix the front lower support rod 92 to the chassis 7. Insert the front locking pin 85 between the front lower support rod 92 and the front upper support rod 91 to lock and limit the position. Remove the rear locking plate 89 of the rear retractable lever 83 from the rear guide limiting roller 87, pull down the rear lower support rod 94 so that the lower end of the rear lower support rod 94 is fitted onto the corresponding plug-in rod 88 on the chassis 7, insert the positioning pin 90, and limit and fix the rear lower support rod 94 to the chassis 7. Insert the rear locking pin between the rear upper support rod 93 and the rear lower support rod 94 to lock and limit the position. This realizes the support of the front retractable lever 82 and the rear retractable lever 83 for the upper frame 10.

[0037] As attached Figure 1 In this invention, two sets of simply supported beams 74 are provided on the chassis 7, and two corresponding lifting drive cylinders 75 are also provided, one-to-one with the simply supported beams 74. Two front retractable rods 82 and two rear retractable rods 83 are provided on the chassis 7. All front retractable rods 82 and rear retractable rods 83 can be retracted or lowered according to the above steps. The upper frame 10 can be connected to the boarding ladder. The front of the upper frame 10 is hinged to the boarding ladder through the drive cylinder, and the rear is hinged to the lower end of the boarding ladder. The lifting mechanism 9 drives the upper frame 10 to lift and lower, thereby realizing the lifting and lowering of the boarding ladder. The upper frame 10, the boarding ladder and the docking platform on it are supported by the support device, which provides stable support and convenient retraction and extension. The invention has an ingenious structure. The front retractable rods and rear retractable rods can be retracted and extended with the lifting mechanism. The front retractable rods and rear retractable rods can be detachably connected to the chassis, which facilitates the retraction and extension of the front retractable rods and rear retractable rods. At the same time, the support connection is also very convenient, which improves the stability and safety of the entire boarding ladder structure.

[0038] Due to the above-mentioned structure, the present invention has the advantages of ingenious structure, good support, high stability, and quick and convenient installation.

Claims

1. A method of using a boarding ladder support device, comprising a method for lowering and supporting the boarding ladder support device, wherein the steps of the method for lowering and supporting the boarding ladder support device are as follows: Step 1: In the initial state, the front retractable rod and the rear retractable rod of the boarding ladder support device are retracted. Both the front retractable rod and the rear retractable rod are in a horizontal state. One end of the front retractable rod is hinged to the upper frame and is connected to the lifting mechanism. One end of the rear retractable rod is hinged to the upper frame and is connected to the lifting mechanism. Step 2: Activate the lifting drive cylinder of the lifting mechanism. The lifting drive cylinder moves the upper frame upward. As the upper frame moves upward, the distance between the hinge point between the upper end of the front retractable rod and the upper frame and the front guide limit roller on the lifting mechanism becomes larger and larger. The front retractable rod gradually extends, and the front upper support rod extends out from the front lower support rod. The front retractable rod swings downward and forward until it is almost vertical. At the same time, the distance between the rear retractable rod and the rear guide limit roller also becomes larger and larger. The rear retractable rod gradually extends, and the rear upper support rod extends out from the rear lower support rod. The rear retractable rod swings downward and backward until it is almost vertical. Then, close the lifting drive cylinder. Step 3: Remove the front retaining plate of the front retractable lever from the front guide limiting roller, pull down the front lower support rod of the front retractable lever to make the front upper support rod and the front lower support rod vertical, and insert and fix the lower end of the front lower support rod to the chassis. Lock and fix the front upper support rod and the front lower support rod. Remove the rear retaining plate of the rear retractable lever from the rear guide limiting roller, pull down the rear lower support rod to make the rear upper support rod and the rear lower support rod vertical, and insert and fix the lower end of the rear lower support rod to the chassis. The upper and lower rear support rods are locked and fixed. The boarding ladder support device includes a chassis, a lifting mechanism, a front retractable rod, and a rear retractable rod. An upper frame is provided above the chassis. The lower end of the lifting mechanism is connected to the chassis, and the upper end is connected to the upper frame. Front retractable rods are provided on both sides of the front end of the upper frame, and rear retractable rods are provided on both sides of the rear end of the upper frame. The front and rear retractable rods are telescopic rods. The upper end of the front retractable rod is hinged to the upper frame, and the upper end of the rear retractable rod is hinged to the upper frame. A front hooking mechanism is provided between the front retractable rod and the lifting mechanism, and a rear hooking mechanism is provided between the rear retractable rod and the lifting mechanism. The front and rear retractable rods are driven to extend and retract by the lifting mechanism. The lifting mechanism includes a simply supported beam assembly and a lifting drive cylinder. Simply supported beam assemblies are symmetrically provided on both sides of the chassis. The simply supported beam assembly includes an outer lower simply supported beam, an inner lower simply supported beam, an outer upper simply supported beam, and an inner upper simply supported beam. The front hooking mechanism includes a front guide limit roller and a front... The mechanism includes a locking pin, a front locking plate, and a front guide limiting roller on the inner upper simply supported beam on the same side as the front retractable rod. The front retractable rod includes a front upper support rod and a front lower support rod, and a front locking plate is provided on the side wall of the front lower support rod. The rear hooking mechanism includes a rear guide limiting roller, a rear locking pin, and a rear locking plate. A rear guide limiting roller is provided on the outer lower simply supported beam on the same side as the rear retractable rod. The rear retractable rod includes a rear upper support rod and a rear lower support rod, and a rear locking plate is provided on the side wall of the rear lower support rod.

2. The method of using the boarding ladder support device according to claim 1, characterized in that: In the third step, the lower end of the front lower support rod is fitted onto the corresponding connector rod on the chassis, and a positioning pin is inserted to limit and fix the front lower support rod to the chassis. A front locking pin is inserted between the front lower support rod and the front upper support rod to lock and fix it. The lower end of the rear lower support rod is fitted onto the corresponding connector rod on the chassis, and a positioning pin is inserted to limit and fix the rear lower support rod to the chassis. A rear locking pin is inserted between the rear upper support rod and the rear lower support rod to lock and fix it.

3. A method of using a boarding ladder support device according to claim 1 or 2, characterized in that: The method of using the boarding ladder support device also includes a method for retracting the boarding ladder support device, the steps of which are as follows: Step 1: In the initial state, the front and rear retractable rods of the boarding ladder support device are both in a vertical support state. Release the connection between the front and rear retractable rods and the chassis, and release the locking and fixing of the front and rear retractable rods. Step 2: Retract the lower front support rod of the front retracting rod upwards, and rotate the lower front support rod backwards so that the front locking plate of the lower front support rod is locked on the front guide limit roller of the lifting mechanism. Then retract the lower rear support rod of the rear retracting rod upwards, and rotate the lower rear support rod forwards so that the rear locking plate of the lower rear support rod is locked on the rear guide limit roller of the lifting mechanism. Step 3: Activate the lifting drive cylinder. The telescopic rod of the lifting drive cylinder retracts, causing the upper frame to move downwards. As the upper frame moves downwards, the distance between the hinge point between the upper end of the front retractable rod and the upper frame and the front guide limit roller decreases. The front retractable rod gradually retracts, and the front upper support rod gradually enters the front lower support rod. The front retractable rod gradually swings backwards and upwards until it becomes horizontal. Simultaneously, as the upper frame moves downwards, the distance between the rear retractable rod and the rear guide limit roller also decreases. The rear retractable rod gradually retracts, and the rear upper support rod gradually enters the rear lower support rod. The rear retractable rod gradually swings forwards and upwards until it becomes horizontal. At this point, the lifting mechanism descends to its lowest point, the front retractable rod rests horizontally on the rear retractable rod, the lifting drive cylinder is closed, and the retraction of the boarding ladder support device is completed.

4. The method of using the boarding ladder support device according to claim 3, characterized in that: In step one, the positioning pins at the lower ends of the front retractable lever and the rear retractable lever are removed respectively, and then the front locking pin on the front retractable lever and the rear locking pin on the rear retractable lever are removed respectively.

5. A method of using a boarding ladder support device according to claim 1, 2, or 4, characterized in that: The chassis frame is fixedly equipped with lifting guide rails on both sides. The chassis frame has an outer lower simple support beam and an inner lower simple support beam. 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 chassis via the roller and lifting guide rails. The middle of the outer lower simple support beam is hinged to the inner lower simple support beam on the same side. An outer upper simple support beam is provided 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 chassis frame, and the upper end of the outer upper simple support beam is provided with an inner upper simple support beam. The lower end of the outer upper simple support beam is connected to the outer lower simple support beam. The beams are hinged, with the outer upper simply supported beam hinged to the inner upper simply supported beam on the same side at its middle part. The upper end of the outer upper simply supported beam is provided with a roller. The lower end of the inner upper simply supported beam is hinged to the inner lower simply supported beam, and the upper end is hinged to the upper frame. Frame guide rails are fixed on both sides of the upper frame. The outer upper simply supported beam is slidably connected to the upper frame via the roller and the frame guide rails. A lifting drive cylinder is provided between the inner upper simply supported beam and the inner lower simply supported beam. One end of the lifting drive cylinder is hinged to the inner upper simply supported beam, and the other end is hinged to the inner lower simply supported beam.

6. The method of using the boarding ladder support device according to claim 5, characterized in that: The upper end of the front upper support rod is hinged to the upper frame, and the lower end is inserted into the front lower support rod. The front upper support rod and the front lower support rod are slidably connected. The lower part of the front upper support rod is provided with a front upper pin hole, and the upper part of the front lower support rod is provided with a front lower pin hole. The front upper support rod is fixedly connected to the front lower support rod via a front locking pin, a front upper pin hole, and a front lower pin hole. The front clamping plate is fixedly connected to the front lower support rod. The front clamping plate is provided with a clamping groove. The front guide limiting roller is placed in the clamping groove of the front clamping plate. The front guide limiting roller abuts against the front clamping plate to limit the front lower support rod on the inner upper simply supported beam.

7. The method of using a boarding ladder support device according to claim 6, characterized in that: The upper end of the rear upper support rod is hinged to the upper frame, and the lower end is inserted into the rear lower support rod. The rear upper support rod and the rear lower support rod are slidably connected. The lower part of the rear upper support rod is provided with a rear upper pin hole, and the upper part of the rear lower support rod is provided with a rear lower pin hole. The rear upper support rod is fixedly connected to the rear lower support rod via a rear locking pin, a rear upper pin hole, and a rear lower pin hole. The rear clamping plate is fixedly connected to the rear lower support rod. The rear clamping plate is provided with a clamping groove. The rear guide limiting roller is placed in the clamping groove of the rear clamping plate. The rear guide limiting roller abuts against the rear clamping plate to limit the rear lower support rod on the outer lower simply supported beam.

8. The method of using the boarding ladder support device according to claim 7, characterized in that: The lower end of the front lower support rod is provided with a connecting groove, and the lower end of the rear lower support rod is provided with a connecting groove. The connecting groove is provided with a connecting pin hole. The chassis frame is provided with a plug rod. The lower end of the plug rod is fixedly connected to the chassis frame. The plug rod is provided with a positioning pin hole. The plug rod is inserted into the connecting groove. The positioning pin passes through the connecting pin hole and the positioning pin hole to fix the front lower support rod or the rear lower support rod to the plug rod.

9. A method of using a boarding ladder support device according to claim 1, 2, 4, 6, 7, or 8, characterized in that: The height of the hinge point between the front retractable rod and the upper frame is higher than the height of the hinge point between the rear retractable rod and the upper frame.

Images