Unit assembled aluminum alloy ladder

Abstract

This invention discloses a novel modular aluminum alloy ladder, comprising a base plate, with casters fixedly connected to the four corners of the bottom of the base plate, an adjustment mechanism fixedly connected to the rear side of the top of the base plate, and a mounting shell movably connected to the front side of the top of the base plate. A frame is provided on the top of the mounting shell, and mounting blocks are fixedly connected to both sides of the bottom of the frame. The bottom of each mounting block extends into the inner cavity of the mounting shell, and slots are provided on opposite sides of each mounting block. Movable blocks are provided on both sides of the inner cavity of the mounting shell. This invention solves the problems of inconvenient assembly and adjustment of existing modular aluminum alloy ladders through the coordinated use of the base plate, casters, adjustment mechanism, limiting component, mounting shell, frame, mounting blocks, slots, movable blocks, first spring, insert rod, operating block, baffle, limiting groove, pedal, mounting box, positioning plate, positioning groove, limiting plate, second spring, and positioning blocks.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy ladder technology, and particularly relates to a modular aluminum alloy ladder. Background Technology

[0002] Aluminum alloy ladders are made of high-strength aluminum alloy profiles. They are lightweight and easy to carry. Advanced square tube extrusion and riveting technology ensures good safety, and they are equipped with strong, non-slip ladder feet, greatly reducing the workload for construction workers. Before using the ladder, the following preparations should be made: First, ensure that all rivets, bolts, nuts, and moving parts are tightly connected, the ladder posts and steps are firmly and reliably secured, and the extension springs and hinges are in good working order. Second, keep the ladder clean and free of grease, oil, wet paint, mud, snow, or other slippery substances. Third, keep the operator's shoes clean and do not wear leather-soled shoes.

[0003] However, existing aluminum alloy ladders still have the problem of being inconvenient to assemble. First, the entire aluminum alloy ladder is connected to the base by fixing or welding, which makes it difficult to separate the ladder and the base. Whether the base or the ladder is damaged, it is very troublesome to replace. Second, the steps and the ladder frame are mostly fixed by welding, which makes it inconvenient to replace the steps when they are damaged. In addition, existing aluminum alloy ladders also have the problem of not being convenient to adjust the angle of use. Placing them at an angle will result in poor stability during use, and in severe cases, they may even tip over, which is unsafe. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a modular aluminum alloy ladder, which has the advantages of easy assembly and easy adjustment, thus solving the problems of inconvenient assembly and adjustment of existing modular aluminum alloy ladders.

[0005] This invention is implemented as follows: a modular aluminum alloy ladder includes a base plate, with casters fixedly connected to the four corners of the bottom of the base plate. An adjustment mechanism is fixedly connected to the rear side of the top of the base plate. A mounting shell is movably connected to the front side of the top of the base plate. A frame is provided on the top of the mounting shell. Mounting blocks are fixedly connected to both sides of the bottom of the frame. The bottom of each mounting block extends into the inner cavity of the mounting shell. Slots are provided on opposite sides of the two mounting blocks. Moving blocks are provided on both sides of the inner cavity of the mounting shell. A first spring is fixedly connected between the two moving blocks. Insert rods are fixedly connected to opposite sides of the two moving blocks. Opposite sides of the two insert rods extend into the inner cavity of the slots. An operating block is fixedly connected to the front side, and the front side of the operating block extends to the front side of the mounting shell. A baffle is fixedly connected to the rear side of the mounting shell. Limiting components are fixedly connected to opposite sides of the two baffles. Limiting grooves are opened on both sides of the frame. A pedal is provided in the inner cavity of the frame. Mounting boxes are provided on both sides of the pedal. Positioning plates are fixedly connected to the bottom of the mounting boxes. Opposite sides of the two positioning plates are fixedly connected to the inner wall of the frame. Positioning grooves are opened on both sides of the pedal. A limiting plate is provided in the inner cavity of the mounting box. A second spring and a positioning block are fixedly connected to both sides of the limiting plate. Opposite sides of the two positioning blocks extend through the mounting box and into the inner cavity of the positioning groove.

[0006] In a preferred embodiment of the present invention, the adjustment mechanism includes an adjustment box, the bottom of which is fixedly connected to a base plate, a motor is fixedly connected to the top of the adjustment box, a first threaded rod is fixedly connected to the bottom of the motor output end, the bottom of the first threaded rod extends through to the bottom of the inner cavity of the adjustment box and is fitted with a first threaded sleeve, an adjustment frame is movably connected to the front side of the first threaded sleeve, and the front side of the adjustment frame extends through the adjustment box and is movably connected to a baffle.

[0007] In a preferred embodiment of the present invention, the surface of the first threaded rod is movably connected to the adjustment box via a first bearing, both ends of the adjustment frame are movably connected to the first threaded sleeve and the baffle via a first rotating shaft, and the front side of the adjustment box is provided with a first opening for use with the adjustment frame.

[0008] As a preferred embodiment of the present invention, a second threaded rod is movably connected to both sides of the top of the base plate, a handwheel is fixedly connected to the top of the second threaded rod, a second threaded sleeve is sleeved on the surface of the second threaded rod, a lifting rod is fixedly connected to the bottom of the second threaded sleeve, and the bottom of the lifting rod extends through to the bottom of the base plate and is fixedly connected to a lifting plate.

[0009] As a preferred embodiment of the present invention, the bottom of the second threaded rod is movably connected to the base plate via a second bearing, and through holes for use with the lifting rod are provided on both sides of the top of the base plate.

[0010] As a preferred embodiment of the present invention, the front side of the mounting shell is provided with a second opening for use with the operating block, and the surface of the mounting shell is movably connected to the bottom plate via a second rotating shaft.

[0011] As a preferred embodiment of the present invention, the limiting component includes a limiting box, the inner cavity of the limiting box is provided with a pull plate, and a limiting rod is fixedly connected to one side of each of the two pull plates. The two limiting rods extend through the limiting box and into the inner cavity of the limiting groove on one side of each of the two opposite sides.

[0012] As a preferred embodiment of the present invention, a pull rod is fixedly connected to the side of the pull plate away from the limiting rod, and a third spring is sleeved on the surface of the pull rod. The opposite ends of the two pull rods both extend to the outside of the limiting box.

[0013] In a preferred embodiment of the present invention, the inner cavity of the positioning groove is provided with a push plate, and a push rod is fixedly connected to one side of each of the two push plates. One end of each of the two push rods passes through the inner cavity of the pedal and is fitted with a fourth spring. A push block is fixedly connected to one side of each of the two push rods. The bottom of the pedal is in contact with the positioning plate.

[0014] As a preferred embodiment of the present invention, a rotating rod is movably connected to the top of the inner cavity of the pedal and located between the two push blocks. A cam is sleeved on the surface of the rotating rod, and the bottom of the rotating rod extends through to the bottom of the pedal and is fixedly connected to a rotating block. Positioning rods are fixedly connected to both sides of the bottom of the pedal, and a positioning hole is provided on the top of the positioning plate for use with the positioning rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This invention solves the problems of inconvenient assembly and adjustment of existing modular aluminum alloy ladders by using a base plate, casters, adjustment mechanism, limiting component, mounting shell, frame, mounting block, slot, moving block, first spring, plug rod, operating block, baffle, limiting groove, pedal, mounting box, positioning plate, positioning groove, limiting plate, second spring and positioning block in combination.

[0017] 2. This invention enables the first threaded rod to rotate by turning on the motor. The rotation of the first threaded rod can adjust the height of the first threaded sleeve. The first threaded sleeve, in cooperation with the adjusting frame, can adjust the angle of the baffle and the mounting shell, thereby adjusting the overall operating angle of the ladder. The first bearing facilitates the rotation of the first threaded rod. The first rotating shaft facilitates the installation and use of the adjusting frame. The handwheel allows the second threaded rod to rotate. The rotation of the second threaded rod, in cooperation with the second threaded sleeve and the lifting rod, can move the lifting plate downwards towards the ground until it is in close contact, improving the stability of the entire device. The second bearing facilitates the rotation of the second threaded rod. The through hole facilitates the installation and use of the lifting rod.

[0018] 3. This invention facilitates the adjustment of the mounting shell by setting a second rotating shaft, allows the user to easily pull the pull plate by setting a pull rod, improves the stability of the frame by setting a limiting rod that can be inserted into the limiting groove, and facilitates the two pull plates to move towards the center for reset by setting a third spring. The rotating block can rotate the rotating rod and cam, and the rotation of the cam can squeeze the push block, causing the two push blocks to move away from each other. The push block, in conjunction with the push rod, can drive the two push plates to move away from each other and squeeze the positioning block until the positioning block is pushed out of the positioning groove, releasing the restriction on the pedal. Then the pedal can be moved for disassembly, which facilitates the subsequent disassembly and maintenance of the pedal. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure provided in an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of the mounting shell provided in an embodiment of the present invention;

[0021] Figure 3 This is a right sectional view of the base plate and adjustment mechanism provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the framework provided in an embodiment of the present invention;

[0023] Figure 5 This is a cross-sectional view of the mounting box provided in an embodiment of the present invention;

[0024] Figure 6 This is a cross-sectional view of the limiting component provided in an embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the pedal provided in an embodiment of the present invention.

[0026] In the diagram: 1. Base plate; 2. Rotating block; 3. Caster wheel; 4. Adjustment mechanism; 401. Adjustment box; 402. Motor; 403. First threaded rod; 404. First threaded sleeve; 405. Adjustment frame; 5. Limiting assembly; 501. Limiting box; 502. Pull plate; 503. Limiting rod; 504. Pull rod; 505. Third spring; 6. Mounting shell; 7. Frame; 8. Mounting block; 9. Slot; 10. Moving block; 11. First spring ; 12. Insert rod; 13. Operating block; 14. Baffle; 15. Limiting groove; 16. Pedal; 17. Mounting box; 18. Positioning plate; 19. Positioning groove; 20. Limiting plate; 21. Second spring; 22. Positioning block; 23. Second threaded rod; 24. Handwheel; 25. Second threaded sleeve; 26. Lifting rod; 27. Lifting plate; 28. Push plate; 29. ​​Push rod; 30. Fourth spring; 31. Push block; 32. Rotating rod; 33. Cam. Detailed Implementation

[0027] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0028] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1 to 7 As shown, the modular aluminum alloy ladder provided in this embodiment of the invention includes a base plate 1. Universal casters 3 are fixedly connected to the four corners of the bottom of the base plate 1. An adjustment mechanism 4 is fixedly connected to the rear side of the top of the base plate 1. A mounting shell 6 is movably connected to the front side of the top of the base plate 1. A frame 7 is provided on the top of the mounting shell 6. Mounting blocks 8 are fixedly connected to both sides of the bottom of the frame 7. The bottom of each mounting block 8 extends into the inner cavity of the mounting shell 6. Slots 9 are provided on opposite sides of each of the two mounting blocks 8. Moving blocks 10 are provided on both sides of the inner cavity of the mounting shell 6. A first spring 11 is fixedly connected between the two moving blocks 10. Insert rods 12 are fixedly connected to opposite sides of each of the two moving blocks 10. The opposite sides of each insert rod 12 extend into the inner cavity of the slot 9. A first spring 11 is fixedly connected to the front side of each moving block 10. There is an operating block 13, the front side of which extends to the front side of the mounting shell 6. A baffle 14 is fixedly connected to the rear side of the mounting shell 6. Limiting components 5 are fixedly connected to opposite sides of the two baffles 14. Limiting grooves 15 are opened on both sides of the frame 7. A pedal 16 is provided in the inner cavity of the frame 7. Mounting boxes 17 are provided on both sides of the pedal 16. A positioning plate 18 is fixedly connected to the bottom of the mounting box 17. The opposite sides of the two positioning plates 18 are fixedly connected to the inner wall of the frame 7. Positioning grooves 19 are opened on both sides of the pedal 16. A limiting plate 20 is provided in the inner cavity of the mounting box 17. A second spring 21 and a positioning block 22 are fixedly connected to both sides of the limiting plate 20. The opposite sides of the two positioning blocks 22 extend through the mounting box 17 and into the inner cavity of the positioning groove 19.

[0030] refer to Figure 1 and Figure 3The adjustment mechanism 4 includes an adjustment box 401. The bottom of the adjustment box 401 is fixedly connected to the base plate 1. A motor 402 is fixedly connected to the top of the adjustment box 401. A first threaded rod 403 is fixedly connected to the bottom of the output end of the motor 402. The bottom of the first threaded rod 403 extends through to the bottom of the inner cavity of the adjustment box 401 and is fitted with a first threaded sleeve 404. An adjustment frame 405 is movably connected to the front side of the first threaded sleeve 404. The front side of the adjustment frame 405 extends through the adjustment box 401 and is movably connected to the baffle 14. The surface of the first threaded rod 403 is movably connected to the adjustment box 401 through a first bearing. Both ends of the adjustment frame 405 are connected to the first threaded sleeve 404. Both 04 and baffle 14 are movably connected via the first rotating shaft. The front side of the adjusting box 401 has a first opening for use with the adjusting frame 405. The top two sides of the base plate 1 are movably connected to the second threaded rod 23. The top of the second threaded rod 23 is fixedly connected to the handwheel 24. The surface of the second threaded rod 23 is fitted with a second threaded sleeve 25. The bottom of the second threaded sleeve 25 is fixedly connected to the lifting rod 26. The bottom of the lifting rod 26 extends through to the bottom of the base plate 1 and is fixedly connected to the lifting plate 27. The bottom of the second threaded rod 23 is movably connected to the base plate 1 via the second bearing. The top two sides of the base plate 1 have through holes for use with the lifting rod 26.

[0031] The above scheme is adopted as follows: By turning on the motor 402, the first threaded rod 403 can be rotated. The rotation of the first threaded rod 403 can drive the first threaded sleeve 404 to adjust the height. The first threaded sleeve 404, in cooperation with the adjusting frame 405, can drive the baffle 14 and the mounting shell 6 to adjust the angle, thereby adjusting the overall usage angle of the ladder. By setting the first bearing, the rotation of the first threaded rod 403 can be facilitated. By setting the first rotating shaft, the installation and use of the adjusting frame 405 can be facilitated. By cooperating with the handwheel 24, the second threaded rod 23 can be rotated. The rotation of the second threaded rod 23, in cooperation with the second threaded sleeve 25 and the lifting rod 26, can drive the lifting plate 27 to move downward close to the ground until it is in close contact, which can improve the stability of the entire device. By setting the second bearing, the rotation of the second threaded rod 23 can be facilitated. By setting the through hole, the installation and use of the lifting rod 26 can be facilitated.

[0032] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7The front side of the mounting shell 6 has a second opening for use with the operating block 13. The surface of the mounting shell 6 is movably connected to the base plate 1 via a second rotating shaft. The limiting assembly 5 includes a limiting box 501. The inner cavity of the limiting box 501 is provided with a pull plate 502. The opposite sides of the two pull plates 502 are fixedly connected to limiting rods 503. The opposite sides of the two limiting rods 503 pass through the limiting box 501 and extend into the inner cavity of the limiting groove 15. The side of the pull plate 502 away from the limiting rods 503 is fixedly connected to a pull rod 504. The surface of the pull rod 504 is fitted with a third spring 505. The opposite ends of the two pull rods 504 pass through to the outside of the limiting box 501. The inner cavity of the positioning groove 19 is... The cavity is provided with push plates 28, and push rods 29 are fixedly connected to the opposite sides of the two push plates 28. The opposite ends of the two push rods 29 penetrate into the inner cavity of the pedal 16 and are fitted with a fourth spring 30. Push blocks 31 are fixedly connected to the opposite sides of the two push rods 29. The bottom of the pedal 16 contacts the positioning plate 18. A rotating rod 32 is movably connected to the top of the inner cavity of the pedal 16 and located between the two push blocks 31. A cam 33 is fitted on the surface of the rotating rod 32. The bottom of the rotating rod 32 penetrates into the bottom of the pedal 16 and is fixedly connected to a rotating block 2. Positioning rods are fixedly connected to both sides of the bottom of the pedal 16. The top of the positioning plate 18 is provided with positioning holes that cooperate with the positioning rods.

[0033] The above scheme is adopted as follows: by setting a second rotating shaft, the adjustment of the housing 6 can be facilitated; by setting a pull rod 504, the user can easily pull the pull plate 502; by setting a limiting rod 503, it can be inserted into the limiting groove 15 to improve the stability of the frame 7; by setting a third spring 505, the two pull plates 502 can be easily moved towards the middle for reset; by cooperating with the rotating block 2, the rotating rod 32 and the cam 33 can be rotated; the rotation of the cam 33 can squeeze the push block 31, causing the two push blocks 31 to move away from each other; the push block 31, through the cooperation of the push rod 29, can drive the two push plates 28 to move away from each other and squeeze the positioning block 22 until the positioning block 22 is pushed out of the positioning groove 19, releasing the restriction on the pedal 16; then the pedal 16 can be moved for disassembly, which facilitates the subsequent disassembly and maintenance of the pedal 16.

[0034] Working principle of the invention:

[0035] In use, the user can move the two movable blocks 10 towards the center by operating block 13. The movable blocks 10 can drive the two side rods 12 to move towards the center, and the movable frame 7 can drive the mounting block 8 into the mounting shell 6. Releasing operating block 13 resets the first spring 11, which, through the cooperation of movable block 10, can drive the rod 12 to move into the slot 9, fixing the mounting block 8 and completing the fixing of frame 7. Turning on motor 402 can drive the first threaded rod 403 to rotate. The rotation of the first threaded rod 403 can drive the first threaded sleeve 404 to adjust the height. The first threaded sleeve 404, through the cooperation of adjusting bracket 405, can drive the baffle 14 and mounting shell 6 to adjust the angle, thereby adjusting the overall usage angle of the ladder. Through the cooperation of handwheel 24, the second threaded rod 23 can be rotated. The rotation of the second threaded rod 23, through the cooperation of second threaded sleeve 25 and lifting rod 26, can drive the lifting plate 27 to move downwards closer to the ground until it is flush, which can raise the entire ladder. To improve the stability of the device, the insertion of the limiting rod 503 into the limiting groove 15 enhances the stability of the frame 7. When the pedal 16 needs to be installed, the pedal 16 is moved to be positioned between the two mounting boxes 17. The downward movement of the pedal 16 will press the positioning block 22, causing the two positioning blocks 22 to move away from each other. The positioning block 22 drives the two limiting plates 20 to move away from each other, pressing the second spring 21 until the positioning block 22 corresponds to the positioning groove 19. Then, the second spring 21 resets and drives the positioning block 22 into the positioning groove 19, completing the installation. When disassembly is required, the rotating rod 32 and cam 33 can be rotated through the cooperation of the rotating block 2. The rotation of the cam 33 can press the push block 31, causing the two push blocks 31 to move away from each other. The push block 31, through the cooperation of the push rod 29, can drive the two push plates 28 to move away from each other, pressing the positioning block 22 until the positioning block 22 is pushed out of the positioning groove 19, releasing the restriction on the pedal 16. Then, the pedal 16 can be moved for disassembly, facilitating subsequent disassembly and maintenance of the pedal 16.

[0036] In summary, this modular aluminum alloy ladder, through the coordinated use of the base plate 1, casters 3, adjustment mechanism 4, limiting component 5, mounting shell 6, frame 7, mounting block 8, slot 9, moving block 10, first spring 11, insertion rod 12, operating block 13, baffle 14, limiting groove 15, pedal 16, mounting box 17, positioning plate 18, positioning groove 19, limiting plate 20, second spring 21, and positioning block 22, solves the problems of inconvenient assembly and adjustment of existing modular aluminum alloy ladders.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular aluminum alloy ladder, including a base plate (1), characterized in that: The four corners of the bottom of the base plate (1) are fixedly connected with casters (3). The rear side of the top of the base plate (1) is fixedly connected with an adjustment mechanism (4). The front side of the top of the base plate (1) is movably connected with a mounting shell (6). A frame (7) is provided on the top of the mounting shell (6). Mounting blocks (8) are fixedly connected to both sides of the bottom of the frame (7). The bottom of the mounting blocks (8) extends through the inner cavity of the mounting shell (6). Slots (9) are provided on opposite sides of the two mounting blocks (8). Moving blocks (10) are provided on both sides of the inner cavity of the mounting shell (6). A first spring (11) is fixedly connected between the two moving blocks (10). The opposite sides of the two moving blocks (10) are fixedly connected. Connected to the insert rod (12), the two insert rods (12) extend to the inner cavity of the slot (9) on opposite sides. The front side of the moving block (10) is fixedly connected to the operating block (13), the front side of the operating block (13) extends to the front side of the mounting shell (6). The rear side of the mounting shell (6) is fixedly connected to the baffle (14), the two baffles (14) are fixedly connected to the limit assembly (5) on opposite sides. Limit grooves (15) are opened on both sides of the frame (7). The inner cavity of the frame (7) is provided with a pedal (16). The two sides of the pedal (16) are provided with mounting boxes (17). The bottom of the mounting box (17) is fixedly connected to the positioning plate (18). The two positioning plates (18) are fixedly connected to the positioning plate (18). On the opposite side, they are fixedly connected to the inner wall of the frame (7). The pedal (16) has positioning grooves (19) on both sides. The inner cavity of the mounting box (17) is provided with a limiting plate (20). The two sides of the limiting plate (20) are respectively fixedly connected with a second spring (21) and a positioning block (22). The opposite side of the two positioning blocks (22) passes through the mounting box (17) and extends into the inner cavity of the positioning groove (19). The adjustment mechanism (4) includes an adjustment box (401). The bottom of the adjustment box (401) is fixedly connected to the base plate (1). The top of the adjustment box (401) is fixedly connected to a motor (402). The bottom of the output end of the motor (402) is fixedly connected to a first spring (21). A threaded rod (403) is provided, the bottom of which extends through to the bottom of the inner cavity of the adjusting box (401) and is fitted with a first threaded sleeve (404). An adjusting frame (405) is movably connected to the front side of the first threaded sleeve (404). The front side of the adjusting frame (405) extends through the adjusting box (401) and is movably connected to the baffle (14). The surface of the first threaded rod (403) is movably connected to the adjusting box (401) through a first bearing. Both ends of the adjusting frame (405) are movably connected to the first threaded sleeve (404) and the baffle (14) through a first rotating shaft. The front side of the adjusting box (401) is provided with a first opening for use with the adjusting frame (405).

2. The modular aluminum alloy ladder as described in claim 1, characterized in that: The top of the base plate (1) is movably connected to both sides of the second threaded rod (23). The top of the second threaded rod (23) is fixedly connected to a handwheel (24). The surface of the second threaded rod (23) is fitted with a second threaded sleeve (25). The bottom of the second threaded sleeve (25) is fixedly connected to a lifting rod (26). The bottom of the lifting rod (26) extends through to the bottom of the base plate (1) and is fixedly connected to a lifting plate (27).

3. The modular aluminum alloy ladder as described in claim 2, characterized in that: The bottom of the second threaded rod (23) is movably connected to the base plate (1) through the second bearing. Both sides of the top of the base plate (1) are provided with through holes for use with the lifting rod (26).

4. The modular aluminum alloy ladder as described in claim 1, characterized in that: The front side of the mounting shell (6) is provided with a second opening for use with the operating block (13), and the surface of the mounting shell (6) is movably connected to the base plate (1) through a second rotating shaft.

5. The modular aluminum alloy ladder as described in claim 1, characterized in that: The limiting component (5) includes a limiting box (501), and the inner cavity of the limiting box (501) is provided with a pull plate (502). The two pull plates (502) are fixedly connected to the opposite side of each of the two pull plates (502), and the opposite side of each of the two limiting rods (503) passes through the limiting box (501) and extends to the inner cavity of the limiting groove (15).

6. The modular aluminum alloy ladder as described in claim 5, characterized in that: A pull rod (504) is fixedly connected to the side of the pull plate (502) away from the limiting rod (503). A third spring (505) is sleeved on the surface of the pull rod (504). The opposite ends of the two pull rods (504) both extend to the outside of the limiting box (501).

7. The modular aluminum alloy ladder as described in claim 1, characterized in that: The inner cavity of the positioning groove (19) is provided with a push plate (28). A push rod (29) is fixedly connected to one side of each of the two push plates (28). One end of each of the two push rods (29) passes through the inner cavity of the pedal (16) and is fitted with a fourth spring (30). A push block (31) is fixedly connected to one side of each of the two push rods (29). The bottom of the pedal (16) is in contact with the positioning plate (18).

8. The modular aluminum alloy ladder as described in claim 1, characterized in that: A rotating rod (32) is movably connected to the top of the inner cavity of the pedal (16) and between the two push blocks (31). A cam (33) is fitted on the surface of the rotating rod (32). The bottom of the rotating rod (32) extends through to the bottom of the pedal (16) and is fixedly connected to a rotating block (2). Positioning rods are fixedly connected to both sides of the bottom of the pedal (16). A positioning hole is opened on the top of the positioning plate (18) to cooperate with the positioning rod.

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