Adjustable boarding ladder device

Abstract

The invention provides an adjustable boarding ladder device, which belongs to the technical field of ship engineering and comprises a ladder main body and a clamping mechanism. The ladder main body comprises an outer ladder and an inner ladder, the outer ladder is internally provided with a storage cavity, the inner ladder is slidably connected in the storage cavity, the top end is provided with a clamping assembly, and the bottom is provided with a supporting assembly; the clamping mechanism realizes quick locking and releasing of the inner ladder and the outer ladder through a clamping block, a telescopic spring, a U-shaped connecting plate, a pull rod, an elliptical disc and a releasing assembly, the releasing assembly adopts the design of an arc-shaped spiral groove and a driving block, and the operation is simple and convenient. The clamping assembly adopts an elastic U-shaped clamping plate and a threaded rod to fix a hull rabbet, and the stability of the supporting assembly is enhanced through a torsion spring and an anti-skid inclined supporting plate. The problems that manual adjustment of an existing boarding ladder is strenuous and low in efficiency are solved, operation convenience, safety and environmental adaptability are improved through a rapid adjustment mechanism and a stable fixing structure, and the boarding ladder is suitable for diversified ships and complex sea conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of ship engineering, and particularly to an adjustable boarding ladder device. Background Art

[0002] In the fields of ship construction and use, a boarding ladder is an important device for facilitating personnel to board the ship deck from the dock or water surface, and is usually installed on the ship's side or deck area. The main function of the boarding ladder is to provide a safe and stable climbing passage for the crew, and at the same time support the needs of equipment handling or emergency evacuation. With the diversification of ship design and use scenarios, the boarding ladder needs to be adjustable to adapt to different water levels, ship types and dock conditions, and at the same time it is required to be easy to install, disassemble and maintain to meet the operation needs of frequent docking and undocking. Most of the existing boarding ladders adopt fixed or partially adjustable designs, but their functionality and environmental adaptability still have certain limitations.

[0003] A boarding ladder is a climbing device for connecting the ship deck to the dock or water surface, and usually consists of a ladder body, a support structure and a fixing device. Its main role is to provide a safe passage for getting on and off the ship, especially when the ship is docking or the test ship frequently docks at the dock. Traditional boarding ladders are mostly of fixed length or simple detachable structures, and some designs achieve height adjustment by telescoping or splicing. However, in actual use, the boarding ladder needs to cope with water level changes, ship swaying and harsh marine environments, while ensuring simple operation and safety. Although certain progress has been made in the design of existing adjustable boarding ladders, there are still some technical defects that limit their application in complex scenarios.

[0004] Regarding an adjustable boarding ladder described in Application No. 202410851788.0 (CN 118529207 A), its length adjustment device realizes the relative sliding adjustment of the inner ladder and the outer ladder through an adjustment screw and an operation window. However, this design has the defect of operation complexity: manually rotating the adjustment screw requires a large amount of physical effort, especially in the case of frequent adjustment or emergencies, the operation efficiency is low, and it is difficult to meet the requirement of rapid adjustment. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract and the title, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the above and / or existing problems, the present invention is proposed.

[0007] The technical problem to be solved by the present invention is the complex operation of the length adjustment device of the existing adjustable boarding ladder.

[0008] To solve the above technical problems, the present invention provides the following technical solution: An adjustable boarding ladder device, comprising,

[0009] A ladder main body, including an outer ladder, a storage cavity is provided inside the outer ladder, an inner ladder is slidably connected inside the storage cavity, clamping components are symmetrically installed on the left and right sides of the top end of the inner ladder, a support component is provided at the bottom of the outer ladder, a plurality of outer boarding ladder grooves and inner boarding ladder grooves for climbing and stepping are provided along the height direction of the main body of the outer ladder and the inner ladder, clamping grooves are symmetrically provided on the left and right sides inside the storage cavity, a rotating cavity is provided at the bottom end inside the inner ladder, and telescopic grooves are symmetrically provided on the left and right sides of the rotating cavity; and,

[0010] A clamping mechanism, including clamping blocks adapted to the clamping grooves on the left and right sides of the storage cavity, and the opposite ends of the two clamping blocks respectively extend into the two telescopic grooves and are fixedly connected with telescopic springs, and the other ends of the two telescopic springs are fixedly connected with the inner walls of the two telescopic grooves, U-shaped connecting plates are fixedly installed on the opposite surfaces of the two clamping blocks and on the outer sides of the two telescopic springs, the opposite ends of the two U-shaped connecting plates both extend into the rotating cavity and are hinged with pull rods, the opposite surfaces of the two pull rods are hinged with an elliptical disc, the elliptical disc is rotationally connected to the center of the rotating cavity through a front-end rotating shaft, and a release component is provided at the rear end of the elliptical disc.

[0011] As a preferred scheme of the adjustable boarding ladder device of the present invention, wherein: the clamping component includes a U-shaped clamping plate fixedly installed at the top end of the inner ladder, the U-shaped clamping plate includes a clamping groove with an opening downward, a clamping plate that can move back and forth is provided at the rear side inside the clamping groove, the rear end of the clamping plate is rotationally connected with a threaded rod, the rear end of the threaded rod is threadedly connected with the rear plate of the U-shaped clamping plate, and the rear end of the threaded rod extends outside the U-shaped clamping plate and is fixedly connected with a knob.

[0012] As a preferred scheme of the adjustable boarding ladder device of the present invention, wherein: the support component includes a round rod fixedly connected to the center of the bottom of the outer ladder, torsion springs are fixedly connected to the left and right side walls of the round rod, an inclined support plate is fixedly connected between the two torsion springs, and anti-slip lines are provided at the bottom of the inclined support plate.

[0013] As a preferred scheme of the adjustable boarding ladder device of the present invention, wherein: a plurality of groups of clamping grooves on the left and right sides of the storage cavity are equidistantly provided from top to bottom along the height direction, each group of clamping grooves includes two symmetrically arranged clamping grooves on the left and right, and each group of clamping grooves is arranged at a position between two adjacent outer boarding ladder grooves.

[0014] As a preferred embodiment of the adjustable boarding ladder device of the present invention, the following is provided: on the left and right sides of the front ends of the outer ladder and the inner ladder, guardrails are symmetrically installed. On the left and right sides of the front surface of the outer ladder, first through grooves are symmetrically opened, and the two guardrails at the front end of the inner ladder are respectively slidably connected in the two first through grooves.

[0015] As a preferred embodiment of the adjustable boarding ladder device of the present invention, the following is provided: the release assembly includes a rotating cylinder fixedly installed at the center of the rear end of the elliptical disk. A button is slidably connected to the rear end inside the rotating cylinder. On the outer surface of the rotating cylinder, two arc-shaped spiral grooves are arranged in a circumferential array. On the left and right sides of the front end of the button, driving blocks adapted to the two arc-shaped spiral grooves are symmetrically installed, and the two driving blocks are respectively slidably connected to the initial ends inside the two arc-shaped spiral grooves.

[0016] As a preferred embodiment of the adjustable boarding ladder device of the present invention, the following is provided: a second through groove is opened at the center of the rear end of the outer ladder, and the rotating cylinder and the button both penetrate through the second through groove and extend to the outside of the outer ladder.

[0017] As a preferred embodiment of the adjustable boarding ladder device of the present invention, the following is provided: on the left and right sides of the rear end of the inner ladder and located on both sides of the button, limiting rods are symmetrically installed. On the outer surfaces of the two limiting rods, sliding sleeves are slidably connected. On the opposite surfaces of the two sliding sleeves, connecting rods are fixedly connected to the outer wall of the button.

[0018] The beneficial effects of the present invention: Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0020] Figure 1 It is the three-dimensional front view of the boarding ladder of the present invention;

[0021] Figure 2 It is the three-dimensional enlarged view of the connection part between the support assembly and the outer ladder of the present invention;

[0022] Figure 3 It is the three-dimensional enlarged view of the clamping assembly of the present invention;

[0023] Figure 4 It is the three-dimensional rear view of the boarding ladder of the present invention;

[0024] Figure 5 It is the three-dimensional view of the inner ladder of the present invention;

[0025] Figure 6 is a perspective view of the outer ladder of the present invention;

[0026] Figure 7 It is a three-dimensional cross-sectional view of the connection between the clamping mechanism of the present invention and the inner ladder and the outer ladder;

[0027] Figure 8 A three-dimensional diagram of the clamping mechanism of the present invention;

[0028] Figure 9 It is a top sectional view of the connection between the clamping mechanism and the inner ladder of the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0032] Example

[0033] Reference Figures 1 to 9 The present invention provides an adjustable boarding ladder device, which aims to overcome the defects of existing boarding ladders such as laborious manual adjustment, low efficiency and susceptibility to corrosion in marine environments through an innovative length adjustment mechanism and a stable fixed structure.

[0034] The device comprises a ladder body 100 and a latching mechanism 200. The sliding fit between the inner ladder 102 and the outer ladder 101, coupled with the quick locking and releasing function of the latching mechanism 200, allows for convenient adjustment of the ladder's length. Furthermore, the clamping assembly 103 and the support assembly 104 ensure the safety and stability of the boarding ladder between the ship's deck and the dock. The following, combined with the technical solution and brief description, details the structure, function, and operating principle of the present invention, supplementing with optimized designs to enhance its practicality.

[0035] The ladder main body 100 is the core structure of the boarding ladder, including an outer ladder 101 and an inner ladder 102. An accommodation cavity 101a is provided inside the outer ladder 101 for accommodating the inner ladder 102 and allowing it to slide therein, so as to realize flexible adjustment of the ladder body length. A number of outer ladder rungs 101b and inner ladder rungs 102a are respectively arranged on the outer ladder 101 and the inner ladder 102 in the height direction. These rungs are stamped into a serrated anti-slip structure with 304 stainless steel, providing a stable stepping point for climbers, suitable for wet or oily scenarios in the marine environment. To enhance durability, the surfaces of the ladder rungs are coated with a salt spray resistant coating to extend the service life. A number of groups of card slots 101c are symmetrically opened on both the left and right sides of the accommodation cavity 101a. Each group of card slots includes two embedded square slots that are symmetric left and right, and are equally spaced in the height direction (for example, one group every 15 cm), and each group of card slots 101c is located between two adjacent outer ladder rungs 101b, avoiding interference with the climbing function and ensuring uniform distribution of the locking points of the clamping mechanism 200.

[0036] A rotating cavity 102b is provided at the bottom end inside the inner ladder 102 for accommodating the moving parts of the clamping mechanism 200. Telescopic slots 102c are symmetrically opened on both the left and right sides of the rotating cavity 102b to provide space for the sliding of the clamping blocks 201. Protective bars 105 are symmetrically installed on both the left and right sides at the front ends of the outer ladder 101 and the inner ladder 102. First through slots 101d are symmetrically opened on both the left and right sides of the front surface of the outer ladder 101. The two protective bars 105 at the front end of the inner ladder 102 are respectively slidably connected in the first through slots 101d to guide the sliding direction of the inner ladder 102 and ensure the stability of the adjustment process. The protective bars 105 are made of high-strength aluminum alloy, and a fluorescent coating is provided on the surface to enhance visibility in the night or low visibility environment. To further improve safety, a detachable soft sheath can be installed on the protective bars 105 to increase the comfort of gripping and prevent the hand from slipping.

[0037] The clamping mechanism 200 is the key component to realize the adjustment of the ladder body length, including a clamping block 201, a telescopic spring 202, a U-shaped connecting plate 203, a pull rod 204, an elliptical disc 205, a rotating shaft 206 and a release assembly 207. The clamping block 201 is adapted to the card slot 101c, and is in the shape of a square block, and its surface is polished to reduce friction to ensure smooth embedding into the card slot 101c. The opposite ends of the two clamping blocks 201 extend into the telescopic slot 102c, and a telescopic spring 202 is fixedly connected thereto. The other end of the telescopic spring 202 is fixedly connected to the inner wall of the telescopic slot 102c to provide an elastic restoring force to maintain the locked state of the clamping block 201. A U-shaped connecting plate 203 is fixedly installed on the opposite surfaces of the clamping block 201 and outside the telescopic spring 202. The opposite ends of the U-shaped connecting plate 203 extend into the rotating cavity 102b and are hinged with a pull rod 204. The opposite surfaces of the two pull rods 204 are hinged to the elliptical disc 205. The elliptical disc 205 is rotatably connected to the center of the rotating cavity 102b through a front rotating shaft 206, and a release assembly 207 is provided at its rear end.

[0038] The release assembly 207 includes a rotating drum 207a fixed at the center of the rear end of the elliptical disk 205, and a button 207b is slidably connected to the rear end of the rotating drum 207a. There are two arc-shaped spiral grooves 207c in a circumferential array on the outer surface of the rotating drum 207a (each groove extends about 90 degrees along the circumference and is in the shape of a quarter spiral). Driving blocks 207d that are compatible with the arc-shaped spiral grooves 207c are symmetrically installed on the left and right sides of the front end of the button 207b. The driving block 207d is slidably connected to the initial end of the arc-shaped spiral groove 207c. A second through groove 101e is opened at the center of the rear end of the outer ladder 101. The rotating drum 207a and the button 207b pass through the second through groove 101e and extend to the outside of the outer ladder 101, so that the operator can press it easily. To ensure linear motion of button 207b, limit rods 208 are symmetrically mounted on the rear end of inner ladder 102, on either side of button 207b. Sliding sleeves 209 are slidably connected to the outer surface of limit rods 208. Sliding sleeves 209 are fixedly connected to the outer wall of button 207b via connecting rods, limiting the movement of button 207b. To enhance operational convenience, button 207b is designed with ergonomic grooves for increased comfort, and a waterproof seal can be installed around button 207b to prevent seawater from seeping into the interior of drum 207a.

[0039] The clamping assembly 103 is used to secure the boarding ladder to the tongue-and-groove of the hull. It is installed on the left and right sides of the top of the inner ladder 102 and includes a U-shaped clamping plate 103a, a clamping plate 103b, a threaded rod 103c, and a knob 103d. The U-shaped clamping plate 103a is made of a high-strength elastic material (such as spring steel) and has a downward-opening clamping groove 103a1. Inside the rear of the clamping groove 103a1, a clamping plate 103b is positioned, which can move back and forth. The rear end of the clamping plate 103b is rotatably connected to the threaded rod 103c. The rear end of the threaded rod 103c is threadedly connected to the rear plate of the U-shaped clamping plate 103a. The rear end of the threaded rod 103c extends to the outside of the U-shaped clamping plate 103a and is fixedly connected to the knob 103d. During use, the top of the ladder body 100 is placed on the edge of the hull, and the U-shaped clamping plate 103a is clamped on the tongue and groove. By turning the knob 103d, the threaded rod 103c is driven to rotate. The threaded rod 103c pushes the clamping plate 103b forward, against the inner wall of the hull, and fixes the ladder body 100. The inner side of the clamping plate 103b is provided with a rubber pad and a toothed anti-skid groove to increase friction and protect the hull surface. The threaded rod 103c is made of 316 stainless steel and coated with an anti-corrosion coating to resist salt spray corrosion in the marine environment. To enhance adaptability, the U-shaped clamping plate 103a can be designed as an adjustable width structure. The opening size of the clamping groove 103a1 can be adjusted by adding bolts to adapt to different tongue and groove thicknesses.

[0040] The support component 104 is located at the bottom of the outer ladder 101 to enhance the stability of contact with the dock or water surface. It includes a round rod 104a fixedly connected to the center of the bottom of the outer ladder 101, a torsion spring 104b, and an inclined support plate 104c. Torsion springs 104b are fixedly connected to the left and right side walls of the round rod 104a, and an inclined support plate 104c is fixedly connected between the two torsion springs 104b. Serrated anti-slip patterns are provided at the bottom of the inclined support plate 104c to ensure firm contact with the dock surface. The torsion spring 104b gives the inclined support plate 104c the function of rotating forward and backward, enabling it to adapt to the angle difference with the dock surface when the boarding ladder is placed obliquely, ensuring that the bottom is in full horizontal contact with the dock and enhancing the overall stability. For further optimization, the inclined support plate 104c can be designed as a detachable structure and connected to the round rod 104a through a quick buckle for easy replacement or adjustment. A high-friction coefficient rubber layer can be embedded at the bottom of the inclined support plate 104c to enhance the anti-slip performance, and drainage grooves can be provided at the edges to prevent slipping caused by water accumulation.

[0041] The working principle of this device is as follows: When it is necessary to adjust the length of the boarding ladder, the staff presses the button 207b. The button 207b moves linearly forward under the limiting action of the sliding sleeve 209 and the limiting rod 208, driving the driving block 207d to slide horizontally along the arc-shaped spiral groove 207c. The semi-spiral design of the arc-shaped spiral groove 207c generates a lateral component force, pushing the rotating cylinder 207a to rotate, driving the elliptical disc 205 to rotate about 90 degrees around the rotating shaft 206. The elliptical disc 205 pulls the U-shaped connecting plate 203 towards the center of the rotating cavity 102b through the pull rod 204, driving the clamping block 201 to retract into the telescopic groove 102c, compressing the telescopic spring 202, and releasing the clamping relationship between the clamping block 201 and the clamping groove 101c. The inner ladder 102 can slide freely in the storage cavity 101a, and the staff adjusts the extended length of the inner ladder 102 according to the height difference between the dock and the hull. After sliding to the appropriate height, the button 207b is released, and the resilience of the telescopic spring 202 pushes the clamping block 201 out. If the clamping block 201 is not aligned with the clamping groove 101c, it will be blocked by the inner wall of the storage cavity 101a, and the staff fine-tunes the position of the inner ladder 102 until the clamping block 201 is horizontally aligned with the clamping groove 101c and is inserted into the clamping groove 101c to complete the locking. The clamping block 201 drives the elliptical disc 205 to reset through the U-shaped connecting plate 203 and the pull rod 204, and the rotating cylinder 207a rotates accordingly. The arc-shaped spiral groove 207c pushes the driving block 207d and the button 207b back to the initial position to prepare for the next adjustment. After the adjustment is completed, the U-shaped clamping plate 103a is clamped on the hull rabbet, and the knob 103d is rotated to adjust the clamping plate 103b to fix the ladder body, and the inclined support plate 104c contacts the dock to ensure stability.

[0042] In this embodiment, through the design of the arc-shaped spiral groove 207c and the driving block 207d of the clamping mechanism 200, the length adjustment operation is simplified, and the defects of the traditional screw adjustment, which is laborious and prone to corrosion, are overcome. The elastic U-shaped clamping plate 103a of the clamping assembly 103 and the torsion spring 104b of the support assembly 104 enhance the adaptability of the device to different hulls and docks, and have significant practical value and market competitiveness.

[0043] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those skilled in the art who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any clause of "means-plus-function" is intended to cover the structure that performs the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0044] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently contemplated best mode of carrying out the present invention or those features that are not relevant to implementing the present invention).

[0045] It should be understood that in the development of any actual implementation, such as in any engineering or design project, numerous specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, such development efforts will be a routine task of design, manufacturing and production.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An adjustable boarding ladder device, characterized in that: including, a ladder main body (100), including an outer ladder (101), a storage cavity (101a) is formed inside the outer ladder (101), an inner ladder (102) is slidably connected inside the storage cavity (101a), clamping assemblies (103) are symmetrically installed on the left and right sides of the top end of the inner ladder (102), a support assembly (104) is arranged at the bottom of the outer ladder (101), a plurality of outer climbing ladder grooves (101b) and inner climbing ladder grooves (102a) for climbing and stepping are arranged along the height direction of the main body of the outer ladder (101) and the inner ladder (102), clamping grooves (101c) are symmetrically formed on the left and right sides inside the storage cavity (101a), a rotating cavity (102b) is formed at the bottom end inside the inner ladder (102), and telescopic grooves (102c) are symmetrically formed on the left and right sides of the rotating cavity (102b); and, a clamping mechanism (200), including clamping blocks (201) adapted to the clamping grooves (101c) on the left and right sides of the storage cavity (101a), the opposite ends of the two clamping blocks (201) respectively extend into the two telescopic grooves (102c) and are fixedly connected with telescopic springs (202), the other ends of the two telescopic springs (202) are fixedly connected with the inner walls of the two telescopic grooves (102c), U-shaped connecting plates (203) are fixedly installed on the opposite surfaces of the two clamping blocks (201) and on the outer sides of the two telescopic springs (202), the opposite ends of the two U-shaped connecting plates (203) both extend into the rotating cavity (102b) and are hinged with pull rods (204), pull rods (204) are hinged on the opposite surfaces of the two pull rods (204) with an elliptical disc (205), the elliptical disc (205) is rotationally connected to the center of the rotating cavity (102b) through a front end rotating shaft (206), and a release assembly (207) is arranged at the rear end of the elliptical disc (205).

2. The adjustable boarding ladder device according to claim 1, characterized in that: The clamping assembly (103) includes a U-shaped clamping plate (103a) fixedly installed at the top end of the inner ladder (102), the U-shaped clamping plate (103a) includes a clamping groove (103a1) with an opening downward, a clamping plate (103b) that can move back and forth is arranged at the rear side inside the clamping groove (103a1), the rear end of the clamping plate (103b) is rotationally connected with a threaded rod (103c), the rear end of the threaded rod (103c) is threadedly connected with the rear plate of the U-shaped clamping plate (103a), and the rear end of the threaded rod (103c) extends outside the U-shaped clamping plate (103a) and is fixedly connected with a knob (103d).

3. The adjustable boarding ladder device according to claim 2, characterized in that: The support assembly (104) includes a round rod (104a) fixedly connected to the center of the bottom of the outer ladder (101), torsion springs (104b) are fixedly connected to the left and right side walls of the round rod (104a), an inclined support plate (104c) is fixedly connected between the two torsion springs (104b), and anti-slip lines are formed at the bottom of the inclined support plate (104c).

4. The adjustable boarding ladder device according to claim 3, characterized in that: The card slots (101c) on the left and right sides of the storage cavity (101a) are provided with multiple groups at equal intervals from top to bottom in the height direction. Each group of card slots (101c) includes two symmetrically arranged card slots on the left and right, and each group of card slots (101c) is arranged at the position between two adjacent outer ladder slots (101b).

5. The adjustable boarding ladder device according to claim 4, wherein: Protective rods (105) are symmetrically installed on the left and right sides of the front ends of the outer ladder (101) and the inner ladder (102). First through slots (101d) are symmetrically opened on the left and right sides of the front surface of the outer ladder (101), and the two protective rods (105) at the front end of the inner ladder (102) are respectively slidably connected in the two first through slots (101d).

6. The adjustable boarding ladder device according to claim 5, wherein: The release assembly (207) includes a rotating cylinder (207a) fixedly installed at the center of the rear end of the elliptical disk (205). A button (207b) is slidably connected to the rear end inside the rotating cylinder (207a). Two arc-shaped spiral grooves (207c) are circumferentially arrayed on the outer surface of the rotating cylinder (207a). Driving blocks (207d) adapted to the two arc-shaped spiral grooves (207c) are symmetrically installed on the left and right sides of the front end of the button (207b), and the two driving blocks (207d) are respectively slidably connected to the initial ends inside the two arc-shaped spiral grooves (207c).

7. The adjustable boarding ladder device according to claim 6, characterized in that: A second through slot (101e) is opened at the center of the rear end of the outer ladder (101), and the rotating cylinder (207a) and the button (207b) both penetrate through the second through slot (101e) and extend to the outside of the outer ladder (101).

8. The adjustable boarding ladder device according to claim 7, wherein: Limiting rods (208) are symmetrically installed on the left and right sides of the rear end of the inner ladder (102) and located on both sides of the button (207b). Sleeve (209) are slidably connected to the outer surfaces of the two limiting rods (208). Opposite surfaces of the two sleeves (209) are fixedly connected to the outer wall of the button (207b) through connecting rods.

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