Adjustable boarding ladder

Abstract

The application provides an adjustable boarding ladder, and relates to the technical field of marine equipment, which comprises a frame structure and a support column structure, the support column structure comprises a support cylinder and a movable column, and a rotary control device is arranged at the connection between the support cylinder and the movable column; the frame structure comprises a first platform and a second platform, one side of the first platform is provided with a movable ladder frame, the upper end of the movable column is provided with a lifting piece for controlling the lifting and falling of the movable ladder frame; one side of the second platform is provided with a fixed ladder frame, a climbing channel is arranged between the first platform and the second platform, an escape channel is arranged below the second platform, a pawl limiting device is arranged outside the support cylinder and between the first platform and the second platform, and the pawl limiting device is used for limiting the rotation of the movable column to ensure the safety of escape; the boarding ladder adopts a double-layer structure, the first platform is communicated with the second platform through the climbing channel, when congestion occurs on the second platform, personnel can be distributed through the escape channel, and the occurrence of trampling can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of marine equipment technology, and in particular to an adjustable boarding ladder. Background Technology

[0002] As a vital means of transportation in today's economic development, ships possess advantages unmatched by other modes of transport. In recent years, with the acceleration of global economic integration, maritime transport has become increasingly busy, and the global shipbuilding market has experienced unprecedented growth, with demand for ships reaching unprecedented levels. Boarding ladders are the passageways between a ship and the outside world. They are movable ladders installed on both sides of the ship for passengers to board and disembark, made of wood or metal. They consist of platforms, ladder frames, steps, handrails, and a hoisting mechanism. When the ship is sailing, they are hoisted up, folded up, and stored on the deck; when needed, they are lowered and suspended on the side of the ship.

[0003] For example, Chinese patent application number CN201711326709.0 discloses a fully adjustable dock boarding ladder, including a landing platform, a boarding ramp, and a boarding platform. The landing platform has a landing support platform at its top, with roller bearing tracks on both sides of the support platform. A movable platform is located within these tracks, with roller bearings on both sides, allowing the movable platform to slide back and forth along the roller bearing tracks without detaching from the support platform. One end of the boarding support platform extends beyond the ship's side and is hinged to the upper part of a 7-shaped pivot, which can rotate without detaching from the support platform. The other end of the boarding support platform has support legs and ladder steps, and is secured with weights to stabilize the entire platform. This invention automatically eliminates the swaying caused by irregular ship rolling, keeping the boarding ladder relatively stable, increasing the safety of personnel boarding, and extending the service life of the boarding ladder. However, since the support platform of this type of boarding ladder is set in a relatively fixed position, the angle setting is not flexible enough when facing ships at multiple angles. Therefore, some ladders adopt a rotating design. The drawback of the rotating ladder is that, due to the additional adjustment in one direction, the ladder will rotate and swing when there is turbulence. If the platform is crowded, the single-passage design makes it difficult to separate people, which may lead to trampling and safety needs to be improved. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes an adjustable boarding ladder. This boarding ladder employs a double-layer structure, with a second platform as the first layer and a first platform as the second layer. A fixed ladder frame is fixed to the second platform. Users ascend to the second platform via the fixed ladder frame and to the first platform via a movable ladder frame. The first and second platforms are connected by a climbing passage. The movable ladder frame is hinged to the first platform. A lifting mechanism controls the lifting of the movable ladder frame, allowing for height adjustment. A rotation control device controls the rotation of the movable column, enabling the movable ladder frame to be easily placed on the ship's side at different locations, offering high flexibility.

[0005] To achieve the purpose of this invention, the invention is achieved through the following technical solution: an adjustable boarding ladder, comprising a frame structure and a support structure, the support structure comprising a support cylinder and a movable column, the movable column being rotatably connected to the upper end of the support cylinder, and a rotation control device being provided at the connection between the support cylinder and the movable column;

[0006] The frame structure includes a first platform and a second platform. The first platform is fixedly connected to the outside of the movable column, and the second platform is fixedly connected to the outside of the support cylinder. The first platform is placed above the second platform.

[0007] A movable ladder is provided on one side of the first platform. The movable ladder is hinged to the first platform. A lifting component is provided at the upper end of the movable column to control the raising and lowering of the movable ladder.

[0008] A fixed ladder is provided on one side of the second platform, and the fixed ladder is fixedly connected to the second platform. A climbing passage is provided between the first platform and the second platform. An escape passage is provided below the second platform. A pawl limiting device is provided on the outside of the support cylinder. The pawl limiting device is placed between the first platform and the second platform to limit the rotation of the movable column so that the escape can be carried out safely.

[0009] A further improvement is that the rotation control device includes a positioning column, a first gear, a second gear, and a motor. The positioning column is fixedly connected to the lower end of the movable column, the first gear is sleeved on the outside of the positioning column, the positioning column and the first gear are fixedly connected, the motor is fixedly connected to the inside of the support cylinder, the output end of the motor is fixedly connected to the second gear, and the second gear meshes with the first gear.

[0010] A further improvement is that the lifting component includes a support plate and hydraulic telescopic rods located on the left and right sides of the movable ladder frame. The support plate is fixedly connected to the upper end of the movable column, the mounting end of the hydraulic telescopic rod is hinged to the support plate, and the output end of the hydraulic telescopic rod is hinged to the upper end of the movable ladder frame.

[0011] A further improvement is that the pawl limiting device includes a ratchet, an operating window, a rotating shaft, a pawl, and a worm gear mechanism. The ratchet is sleeved on the outside of the positioning post, and the positioning post is fixedly connected to the ratchet. The operating window is opened on the outside of the support cylinder. The rotating shaft is rotatably set inside the operating window. A pawl is fixedly connected to the outside of the rotating shaft. The pawl cooperates with the pawl set on the outside of the ratchet. The operating window is equipped with a worm gear mechanism for controlling the rotation of the rotating shaft.

[0012] A further improvement is that the climbing passage includes a first window and a movable ladder. The first window is located at the lower end of the first platform, and the movable ladder is fixedly connected to the lower end of the first platform. The left and right sides of the movable ladder are respectively provided with a first support and a first diagonal brace. The first support and the first diagonal brace are fixedly connected to the movable ladder and to the lower end of the first platform.

[0013] A further improvement is that: a first hinged window is provided outside the first window, one end of the first hinged window is hinged to the upper end of the first platform via a pivot, and the other end of the first hinged window is provided with a first buckle, which engages with a slot provided on the upper end of the first platform.

[0014] A further improvement is that the escape passage includes a second window and a fixed ladder fixed to the ground. The second window is opened at the lower end of the movable ladder frame. The upper end of the fixed ladder is fixedly connected to the lower end of the movable ladder frame. The left and right sides of the fixed ladder are respectively provided with a second support and a second diagonal brace. The second support and the second diagonal brace are fixedly connected to the fixed ladder. The second support and the second diagonal brace are fixedly connected to the lower end of the second platform.

[0015] A further improvement is that a second hinged window (27) is provided outside the second window. One end of the second hinged window (27) is hinged to the upper end of the second platform via a pivot. The other end of the second hinged window (27) is provided with a second buckle, which engages with a slot provided on the upper end of the second platform.

[0016] A further improvement is that: the upper edge of the first platform and the movable ladder is provided with a first railing to prevent people from falling; two sets of first railings are fixedly connected to the first platform and the movable ladder; and the lower end of the movable ladder is provided with multiple sets of casters.

[0017] A further improvement is that a second railing is provided along the upper end of the second platform and the fixed ladder to prevent people from falling, and the second railing is fixedly connected to the second platform and the fixed ladder.

[0018] The boarding ladder of this invention adopts a double-layer structure, with the second platform as the first layer and the first platform as the second layer. A fixed ladder frame is fixed to the second platform. People can climb to the second platform via the fixed ladder frame and to the first platform via the movable ladder frame. The first and second platforms are connected by a climbing passage. The movable ladder frame is hinged to the first platform. The movable ladder frame is raised by a lifting component and its height can be adjusted. The movable column is rotated by a rotation control device, allowing the movable ladder frame to be easily placed on the ship's side in different directions, providing high flexibility. In addition to the fixed ladder frame, the second platform also has an escape passage underneath. When the second platform becomes congested, people can be diverted through the escape passage, effectively reducing the occurrence of trampling. A pawl limiting device restricts the rotation of the movable column, providing a safety guarantee for escape. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the movable ladder frame in this invention;

[0020] Figure 2 This is a structural diagram of the fixed ladder frame in this invention;

[0021] Figure 3 This is a structural diagram of the inner side of the support cylinder in this invention;

[0022] Figure 4 This is a structural diagram of the first platform in this invention;

[0023] Figure 5 This is a structural diagram of the movable ladder in this invention;

[0024] Figure 6 This is a structural diagram of the second platform in this invention;

[0025] Figure 7 This is the present invention. Figure 3 Enlarged view of the structure at point A in the middle.

[0026] The components include: 1. Support cylinder; 2. Movable column; 3. First platform; 4. Second platform; 5. Movable ladder; 6. Casters; 7. Fixed ladder; 8. Support plate; 9. Hydraulic telescopic rod; 10. First fence; 11. Second fence; 12. First window; 13. Movable ladder; 14. Second window; 15. Fixed ladder; 16. Operating window; 17. Positioning column; 18. First gear; 19. Second gear; 20. Motor; 21. Ratchet; 22. Pawl; 23. First hinged window; 24. First latch; 25. First bracket; 26. First diagonal brace; 27. Second hinged window; 28. Second latch; 29. ​​Second bracket; 30. Second diagonal brace; 31. Rotating shaft; 32. Pawl; 33. Worm gear mechanism. Detailed Implementation

[0027] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0028] according to Figures 1-7 As shown, this embodiment proposes an adjustable boarding ladder, including a frame structure and a support structure. The support structure includes a support cylinder 1 and a movable column 2. The movable column 2 is rotatably connected to the upper end of the support cylinder 1. A rotation control device is provided at the connection between the support cylinder 1 and the movable column 2.

[0029] The frame structure includes a first platform 3 and a second platform 4. The first platform 3 is fixedly connected to the outside of the movable column 2, and the second platform 4 is fixedly connected to the outside of the support cylinder 1. The first platform 3 is placed above the second platform 4.

[0030] A movable ladder 5 is provided on one side of the first platform 3. The movable ladder 5 is hinged to the first platform 3. The upper end of the movable column 2 is provided with a lifting component for controlling the raising and lowering of the movable ladder 5.

[0031] A fixed ladder 7 is provided on one side of the second platform 4. The fixed ladder 7 is fixedly connected to the second platform 4. A climbing passage is provided between the first platform 3 and the second platform 4. An escape passage is provided below the second platform 4. A pawl limiting device is provided on the outside of the support cylinder 1. The pawl limiting device is placed between the first platform 3 and the second platform 4 to limit the rotation of the movable column 2 so that the escape can be carried out safely.

[0032] The boarding ladder has a double-layer structure, with the second platform 4 as the first layer and the first platform 3 as the second layer. The fixed ladder frame 7 is fixed to the second platform 4. People can climb to the second platform 4 via the fixed ladder frame 7 and to the first platform 3 via the movable ladder frame 5. The first platform 3 and the second platform 4 are connected by a climbing passage. The movable ladder frame 5 is hinged to the first platform 3. The movable ladder frame 5 is raised by the lifting component and its height can be adjusted. The movable column 2 can be rotated by the rotation control device, allowing the movable ladder frame 5 to be easily placed on the ship's side in different directions, which is highly flexible.

[0033] The first platform 3 is connected to the second platform 4 via a climbing passage. In addition to the fixed ladder 7, the second platform 4 also has an escape passage underneath. When the second platform 4 becomes congested, people can be diverted through the escape passage, which can effectively reduce the occurrence of trampling. The ratchet limit device restricts the rotation of the movable column 2, providing a safety guarantee for escape.

[0034] Regarding the rotation control device:

[0035] The rotation control device includes a positioning column 17, a first gear 18, a second gear 19, and a motor 20. The positioning column 17 is fixedly connected to the lower end of the movable column 2. The first gear 18 is sleeved on the outside of the positioning column 17. The positioning column 17 and the first gear 18 are fixedly connected. The motor 20 is fixedly connected to the inside of the support cylinder 1. The output end of the motor 20 is fixedly connected to the second gear 19. The second gear 19 meshes with the first gear 18. The second gear 19 is controlled to rotate by the motor 20. When the second gear 19 rotates, it meshes with the first gear 18, causing the first gear 18 to rotate. Since the first gear 18 is fixed to the positioning column 17, when the first gear 18 rotates, the positioning column 17 and the movable column 2 will also rotate, adjusting the orientation of the movable ladder frame 5.

[0036] The lifting height of the movable ladder frame 5 is controlled by lifting components. Specifically, the lifting components include a support plate 8 and hydraulic telescopic rods 9 located on the left and right sides of the movable ladder frame 5. The support plate 8 is fixedly connected to the upper end of the movable column 2. The mounting end of the hydraulic telescopic rod 9 is hinged to the support plate 8, and the output end of the hydraulic telescopic rod 9 is hinged to the upper end of the movable ladder frame 5. The movable ladder frame 5 is hinged to the first platform 3. The movable ladder frame 5 and the support plate 8 are connected by at least two hydraulic telescopic rods 9. The lifting and lowering of the movable ladder frame 5 is controlled by the hydraulic telescopic rods 9.

[0037] Regarding the pawl limiting device:

[0038] The pawl limiting device includes a ratchet 21, an operating window 16, a rotating shaft 31, a pawl 32, and a worm gear mechanism 33. The ratchet 21 is sleeved on the outside of the positioning post 17, and the positioning post 17 is fixedly connected to the ratchet 21. The operating window 16 is opened on the outside of the support cylinder 1. The rotating shaft 31 is rotatably disposed on the inside of the operating window 16. A pawl 32 is fixedly connected to the outside of the rotating shaft 31. The pawl 32 cooperates with the pawl 22 disposed on the outside of the ratchet 21. The operating window 16 is located inside the ratchet. A worm gear mechanism 33 is provided to control the rotation of the rotating shaft 31. During diversion, the operator controls the rotation of the rotating shaft 31 through the worm gear mechanism 33. As the rotating shaft 31 rotates, it drives the pawl 32 to rotate, moving the pawl 32 from the outside of the support cylinder 1 to the inside of the support cylinder 1. When the positioning column 17 rotates due to inertia, the pawl 22 on the ratchet 21 will collide with the pawl 32, and the pawl 32 will lock the rotating shaft 31, restricting the rotation of the movable column 2 and ensuring the safety of personnel diversion.

[0039] The worm gear mechanism 33 includes a worm wheel, a worm, and a hand-operated screw head. The worm wheel is fixed on the outside of the rotating shaft 31, and the worm is rotatably located inside the operating window 16. The rotation of the worm is controlled by the hand-operated screw head. The worm meshes with the worm wheel to rotate the rotating shaft 31, thereby controlling the rotation of the pawl 32. The worm gear mechanism 33 has self-locking properties, which ensures that the pawl 32 will not rotate back after being impacted. The worm gear mechanism 33 is a conventional technology and will not be described in detail here.

[0040] It is worth noting in detail that the climbing passage includes a first window 12 and a movable ladder 13. The first window 12 is located at the lower end of the first platform 3, and the movable ladder 13 is fixedly connected to the lower end of the first platform 3. The left and right sides of the movable ladder 13 are respectively provided with a first support 25 and a first diagonal brace 26. The first support 25 and the first diagonal brace 26 are fixedly connected to the movable ladder 13 and to the lower end of the first platform 3, in order to improve the structural strength of the movable ladder 13 and provide safety for personnel to pass through the movable ladder 13. The movable ladder 13 is fixed to the first platform 3. When the movable column 2 drives the first platform 3 to rotate, the movable ladder 13 also rotates. When the movable ladder 13 rotates, it will not collide with the structural components between the first platform 3 and the second platform 4.

[0041] To prevent people passing through the first platform 3 from accidentally falling through the first window 12, a first hinged window 23 is provided outside the first window 12. One end of the first hinged window 23 is hinged to the upper end of the first platform 3 via a pivot, and the other end of the first hinged window 23 is provided with a first latch 24, which engages with a slot provided on the upper end of the first platform 3. Normally, the movable elevator 13 is in the closed state. To go to the next floor via the movable elevator 13, simply pull the first hinged window 23 upward to open it. To go to the next floor via the movable elevator 13, simply push the first hinged window 23 upward to open it.

[0042] It is worth noting in detail that the escape passage includes a second window 14 and a fixed ladder 15 fixed to the ground. The second window 14 is located at the lower end of the movable ladder frame 5. The upper end of the fixed ladder 15 is fixedly connected to the lower end of the movable ladder frame 5. The left and right sides of the fixed ladder 15 are respectively provided with a second support 29 and a second diagonal brace 30. The second support 29 and the second diagonal brace 30 are fixedly connected to the fixed ladder 15 and are fixedly connected to the lower end of the second platform 4. This is to improve the structural strength of the fixed ladder 15 and provide safety for personnel passing through the fixed ladder 15.

[0043] To prevent people passing on the second platform 4 from accidentally falling through the second window 14, a second hinged window 27 is provided outside the second window 14. One end of the second hinged window 27 is hinged to the upper end of the second platform 4 via a pivot, and the other end of the second hinged window 27 is provided with a second buckle 28, which engages with a slot provided on the upper end of the second platform 4. The setting method of the second hinged window 27 is the same as that of the first hinged window 23, so it will not be explained in detail here.

[0044] Furthermore, the upper ends of the first platform 3 and the movable ladder 5 are provided with first railings 10 to prevent people from falling. The two sets of first railings 10 are fixedly connected to the first platform 3 and the movable ladder 5 respectively. The lower end of the movable ladder 5 is provided with multiple sets of casters 6 to support the movable ladder 5 to move on the ship's side.

[0045] Furthermore, the upper ends of the second platform 4 and the fixed ladder 7 are provided with a second railing 11 to prevent people from falling, and the second railing 11 is fixedly connected to the second platform 4 and the fixed ladder 7.

[0046] This adjustable boarding ladder adopts a double-layer structure. The second platform 4 is the first layer, and the first platform 3 is the second layer. The fixed ladder frame 7 is fixed to the second platform 4. People can climb to the second platform 4 via the fixed ladder frame 7 and to the first platform 3 via the movable ladder frame 5. The first platform 3 and the second platform 4 are connected by a climbing passage. The movable ladder frame 5 is hinged to the first platform 3. The movable ladder frame 5 is raised by a lifting device, and its height can be adjusted. The movable column 2 is rotated by a rotation control device, allowing the movable ladder frame 5 to be easily placed on the ship's side in different directions, providing high flexibility. The first platform 3 is connected to the second platform 4 via the climbing passage. In addition to the fixed ladder frame 7, the second platform 4 also has an escape passage underneath. When the second platform 4 becomes congested, people can be diverted through the escape passage, which can effectively reduce the occurrence of trampling. The rotation of the movable column 2 is restricted by a pawl limit device, providing a safety guarantee for escape.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable boarding ladder comprising a frame structure and a support structure, said support structure comprising a support cylinder (1) and a movable column (2), said movable column (2) being pivotally connected to the upper end of the support cylinder (1), characterized in that: The connecting part of the support cylinder (1) and the movable column (2) is provided with a rotation control device; The frame body structure comprises a first platform (3) and a second platform (4), the first platform (3) is fixedly connected to the outside of the movable column (2), and the second platform (4) is fixedly connected to the outside of the support cylinder (1); the first platform (3) is arranged above the second platform (4); One side of the first platform (3) is provided with a movable ladder stand (5), the movable ladder stand (5) is hinged to the first platform (3), and the upper end of the movable column (2) is provided with a lifting piece for controlling the lifting of the movable ladder stand (5); One side of the second platform (4) is provided with a fixed ladder stand (7), the fixed ladder stand (7) is fixedly connected to the second platform (4), a climbing channel is arranged between the first platform (3) and the second platform (4), an escape channel is arranged below the second platform (4), and a pawl limiting device is arranged on the outside of the support cylinder (1) and between the first platform (3) and the second platform (4), so as to limit the rotation of the movable column (2) and ensure the safety of escape; The rotation control device comprises a positioning column (17), a first gear (18), a second gear (19) and a motor (20), the positioning column (17) is fixedly connected to the lower end of the movable column (2), the first gear (18) is sleeved on the outside of the positioning column (17), the positioning column (17) is fixedly connected to the first gear (18), the motor (20) is fixedly connected to the inside of the support cylinder (1), the output end of the motor (20) is fixedly connected to the second gear (19), and the second gear (19) is meshed with the first gear (18); The pawl limiting device comprises a ratchet wheel (21), an operation window (16), a rotating shaft (31), a clamping jaw (32) and a worm and gear mechanism (33), the ratchet wheel (21) is sleeved on the outside of the positioning column (17), the positioning column (17) is fixedly connected to the ratchet wheel (21), the operation window (16) is arranged on the outside of the support cylinder (1), the rotating shaft (31) is rotatably arranged on the inside of the operation window (16), the clamping jaw (32) is fixedly connected to the outside of the rotating shaft (31), the clamping jaw (32) is matched with a pawl (22) arranged on the outside of the ratchet wheel (21), and the worm and gear mechanism (33) for controlling the rotation of the rotating shaft (31) is arranged in the operation window (16); The climbing channel comprises a first window (12) and a movable ladder (13), the first window (12) is arranged at the lower end of the first platform (3), and the movable ladder (13) is fixedly connected to the lower end of the first platform (3); left and right sides of the movable ladder (13) are respectively provided with a first support (25) and a first inclined support (26), the first support (25) and the first inclined support (26) are fixedly connected to the movable ladder (13), and the first support (25) and the first inclined support (26) are fixedly connected to the lower end of the first platform (3); The escape passage comprises a second window (14) and a fixed ladder (15) fixed on the ground, the second window (14) is arranged at the lower end of the movable ladder stand (5), the upper end of the fixed ladder (15) is fixedly connected with the lower end of the movable ladder stand (5), the left and right sides of the fixed ladder (15) are respectively provided with a second support (29) and a second inclined support (30), the second support (29) and the second inclined support (30) are fixedly connected with the fixed ladder (15), and the second support (29) and the second inclined support (30) are fixedly connected with the lower end of the second platform (4).

2. An adjustable boarding ramp as claimed in claim 1, characterized in that: The lifting piece comprises a support plate (8) and a hydraulic telescopic rod (9) arranged on the left and right sides of the movable ladder stand (5), the support plate (8) is fixedly connected with the upper end of the movable column (2), the mounting end of the hydraulic telescopic rod (9) is hinged with the support plate (8), and the output end of the hydraulic telescopic rod (9) is hinged with the upper end of the movable ladder stand (5).

3. An adjustable boarding ramp as claimed in claim 1, characterized in that: The first window (12) is externally provided with a first window lifting device (23), one end of the first window lifting device (23) is hinged with the upper end of the first platform (3) through a pivot, the other end of the first window lifting device (23) is provided with a first buckle (24), and the first buckle (24) is buckled with a clamping groove arranged at the upper end of the first platform (3).

4. An adjustable boarding ramp as claimed in claim 1, characterized in that: The second window (14) is externally provided with a second window lifting device (27), one end of the second window lifting device (27) is hinged with the upper end of the second platform (4) through a pivot, the other end of the second window lifting device (27) is provided with a second buckle (28), and the second buckle (28) is buckled with a clamping groove arranged at the upper end of the second platform (4).

5. An adjustable boarding ramp as claimed in claim 1, characterized in that: The upper ends of the first platform (3) and the movable ladder stand (5) are provided with a first fence (10) for preventing people from falling, and two groups of the first fence (10) are fixedly connected with the first platform (3) and the movable ladder stand (5) respectively.

6. An adjustable boarding walk according to any one of claims 1-5, characterized in that: The upper ends of the second platform (4) and the fixed ladder stand (7) are provided with a second fence (11) for preventing people from falling, and the second fence (11) is fixedly connected with the second platform (4) and the fixed ladder stand (7).

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