An improved mobile climbing ladder

Abstract

The present invention discloses an improved mobile climbing ladder, which includes a frame body and a plurality of universal wheels, as well as a connection mechanism, a driving mechanism and a limiting mechanism arranged in the frame body. The connection mechanism connects each universal wheel, and the limiting mechanism is detachably connected to the connection mechanism. The limiting mechanism is used to press down and abut against the connection mechanism so that the connection mechanism drives the universal wheels to move to the bottom of the frame body to drive the frame body to move; the driving mechanism drives and limits the connection mechanism. The driving mechanism is used to drive the limiting mechanism away from the connection mechanism so that the connection mechanism, through the gravity of the frame body pressing down, retracts the universal wheels into the frame body; the driving mechanism is also used to lift the frame body and drive the limiting mechanism to abut against the connection mechanism so that the universal wheels move to the bottom of the frame body. In the technical solution proposed by the present invention, the load-bearing of the universal wheels is reduced, effectively reducing the damage rate of each universal wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of step ladders, and particularly to an improved mobile step ladder. Background Art

[0002] A step ladder is one of the daily tools in a warehouse. Generally, multiple layers of shelves are set in the warehouse, and workers usually use a step ladder to load and unload goods on the upper layers of the shelves. A number of universal wheels are provided at the bottom of the step ladder to facilitate the overall movement of the step ladder. When workers perform light goods loading and unloading, the existing step ladder can ensure normal operation. When workers load and unload heavier goods through the step ladder, due to the limited load-bearing capacity of the universal wheels, the universal wheels are often damaged due to load-bearing problems, thus affecting the normal operation of the entire warehouse operation. Summary of the Invention

[0003] The main object of the present invention is to provide an improved mobile step ladder, aiming to solve the problem of high damage rate of the universal wheels of the step ladder due to load-bearing problems.

[0004] To achieve the above object, the technical solution proposed by the present invention is:

[0005] An improved mobile step ladder, comprising a frame body and a number of universal wheels, as well as a connection mechanism, a driving mechanism and a limiting mechanism arranged in the frame body. The connection mechanism connects each of the universal wheels. The limiting mechanism is detachably connected to the connection mechanism. The limiting mechanism is used to press down and abut against the connection mechanism, so that the connection mechanism drives the universal wheels to move to the bottom of the frame body and drives the frame body to move. The driving mechanism drives and connects the limiting mechanism. The driving mechanism is used to drive the limiting mechanism away from the connection mechanism, so that the connection mechanism, through the gravity of the frame body pressing down, retracts the universal wheels into the frame body. The driving mechanism is also used to lift the frame body and drive the limiting mechanism to abut against the connection mechanism, so that the universal wheels move to the bottom of the frame body.

[0006] Preferably, the connecting mechanism includes a connecting frame, two mounting seats, two first hinge shafts and two second hinge shafts. One part of the universal wheels is arranged on one of the mounting seats, and the other part of the universal wheels is arranged on the other mounting seat; the two first hinge shafts are arranged in parallel at intervals, the connecting frame is located between the two first hinge shafts, the connecting frame and one of the mounting seats are hinged through one of the first hinge shafts, and the connecting frame and the other mounting seat are hinged through the other first hinge shaft; the two second hinge shafts are arranged in parallel at intervals, and the two second hinge shafts are parallel to the two first hinge shafts; the two second hinge shafts are fixedly arranged in the frame body, the two mounting seats are located between the two second hinge shafts, one of the mounting seats is hinged to one of the second hinge shafts, and the other mounting seat is hinged to the other second hinge shaft; the limiting mechanism is detachably connected to the connecting frame, and the frame body is used to press down when the limiting mechanism is away from the connecting frame, so that the two mounting seats rotate upward along the connected second hinge shafts to move each universal wheel into the frame body; the limiting mechanism is used to abut against the connecting frame and move vertically downward in the direction of the ground when the driving mechanism lifts the frame body, so that the connecting frame drives the two mounting seats to move vertically downward along the connected second hinge shafts to move each universal wheel to the bottom of the frame body.

[0007] Preferably, two guide posts are arranged in the frame body, and the two guide posts are arranged vertically and at intervals; the connecting frame includes a third hinge shaft, two guide seats and a plurality of connecting rods. The third hinge shaft is parallel to the first hinge shaft, the third hinge shaft is located between the two first hinge shafts, one end of each connecting rod is hinged to the third hinge shaft, the other ends of a part of the connecting rods are hinged to one of the first hinge shafts, and the other ends of the other part of the connecting rods are hinged to the other first hinge shaft; the third hinge shaft is located between the two guide posts, the third hinge shaft is perpendicular to the two guide posts respectively, one end of the third hinge shaft is slidably connected to one of the guide posts through one of the guide seats, and the other end of the third hinge shaft is slidably connected to the other guide post through the other guide seat.

[0008] Preferably, the driving mechanism includes a connecting shaft and a control frame. The connecting shaft is transversely arranged on the side of each mounting seat away from the limiting mechanism; the control frame is located on the side of the connecting frame away from the limiting mechanism, and the control frame is located between the two first hinge shafts; one end of the control frame is hinged to the connecting shaft, the other end of the control frame extends out of the frame body, and a plurality of pulleys are arranged on the side of the control frame away from the connecting frame; the control frame is used to rotate downward along the connecting shaft so that each pulley abuts against the ground to lift the frame body.

[0009] Preferably, the frame body is provided with a limit block for limiting the distance of the control frame rotating downward along the connecting shaft, so that when the limit block abuts against the control frame, the control frame supports the frame body through each pulley; a tension spring is arranged between the control frame and the connecting frame, one end of the tension spring is connected to the control frame, and the other end of the tension spring is connected to the connecting frame.

[0010] Preferably, the limiting mechanism includes a reset structure, a limiting column and a hinge seat. The hinge seat is fixed inside the frame body and is located above the connecting frame; the limiting column is located between the hinge seat and the connecting frame, the limiting column is arranged vertically, the top end of the limiting column is hinged to the hinge seat, and the axial direction of the limiting column along the rotation direction of the hinge seat is parallel to the first hinge axis; the reset structure is arranged on one side of the hinge seat, the output end of the reset structure is hinged to the limiting column, the driving mechanism is drivingly connected to the reset structure, and the driving mechanism is used to control the reset structure to drive the limiting column to rotate along the hinge seat, so that the limiting column moves away from the connecting frame, or the end of the limiting column away from the hinge seat abuts against the connecting frame.

[0011] Preferably, the reset structure includes a connecting cable, a first sleeve, a rebounder, a first guide wheel and a fixing sleeve. The first sleeve is horizontally arranged on one side of the hinge seat, one end of the first sleeve is arranged close to the hinge seat, the fixing sleeve, the rebounder and the first guide wheel are arranged inside the first sleeve, the fixing sleeve is arranged close to the hinge seat, the first guide wheel is arranged away from the hinge seat, the rebounder is arranged between the fixing sleeve and the first guide wheel, the output end of the rebounder is connected to the fixing sleeve, and the end of the fixing sleeve away from the rebounder is used as the output end of the reset structure and is hinged to the limiting column; one end of the connecting cable is connected to the fixing sleeve, and the other end of the connecting cable is connected to the driving mechanism after being deflected by the first guide wheel; the driving mechanism is used to pull the connecting cable downward to drive the fixing sleeve to touch the rebounder, so that the rebounder drives the fixing sleeve to push the limiting column away from the connecting frame.

[0012] Preferably, a cross column is arranged on one side of the limiting column away from the reset structure; a flexible layer is arranged at the end of the limiting column away from the hinge seat.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] The connecting mechanism drives each universal wheel to move, the driving mechanism controls the limiting mechanism, the limiting mechanism abuts against the connecting mechanism, and the driving mechanism lifts the frame body so that the universal wheels move to the bottom of the frame body; when the limiting mechanism moves away from the connecting mechanism, the gravity of the frame body itself causes the universal wheels to automatically enter the frame body, realizing the storage of each universal wheel during loading and unloading of goods, with the frame body as the support; when moving the frame body, the universal wheels support the frame body to move, reducing the load on the universal wheels and effectively reducing the damage rate of each universal wheel. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. 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 also be obtained based on the structures shown in these drawings.

[0016] Figure 1 Structural schematic diagram of an embodiment of the improved mobile ladder for climbing in the present invention;

[0017] Figure 2 For Figure 1 Structural schematic diagram of removing the front occlusion;

[0018] Figure 3 For Figure 1 Structural schematic diagram of removing the occlusion in the right view;

[0019] Figure 4 For Figure 3 Enlarged structural schematic diagram at position A;

[0020] Figure 5 Structural schematic diagram inside the first sleeve.

[0021] Explanation of the reference numerals in the drawings:

[0022] 1 - Frame body; 11 - Universal wheel; 12 - Guide post; 13 - Limit block; 14 - Limit shaft;

[0023] 2 - Connecting mechanism; 21 - Connecting frame; 22 - Mounting seat; 23 - First hinge shaft; 24 - Second hinge shaft; 25 - Third hinge shaft; 26 - Guide seat; 27 - Connecting rod;

[0024] 3 - Driving mechanism; 31 - Connecting shaft; 32 - Control frame; 33 - Pulley; 34 - Tension spring;

[0025] 4 - Limiting mechanism; 41 - Limiting column; 42 - Hinge seat; 43 - Cross column;

[0026] 5 - Reset structure; 51 - Connecting cable; 52 - First sleeve; 53 - Rebounder; 54 - First guide wheel; 55 - Fixed sleeve;

[0027] 6 - Guide structure;

[0028] The realization, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly defined and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The present invention provides an improved mobile climbing ladder.

[0035] As Figures 1 to 5 shown, an improved mobile ladder includes a frame body 1 and a plurality of universal wheels 11, as well as a connecting mechanism 2, a driving mechanism 3 and a limiting mechanism 4 arranged in the frame body 1. The connecting mechanism 2 connects each universal wheel 11, and the limiting mechanism 4 is detachably connected to the connecting mechanism 2. The limiting mechanism 4 is used to press down and abut against the connecting mechanism 2 so that the connecting mechanism 2 drives the universal wheels 11 to move to the bottom of the frame body 1, driving the frame body 1 to move; the driving mechanism 3 drives and limits the connecting mechanism 4, and the driving mechanism 3 is used to drive the limiting mechanism 4 away from the connecting mechanism 2 so that the connecting mechanism 2, through the gravity of the frame body 1 pressing down, retracts the universal wheels 11 into the frame body 1; the driving mechanism 3 is also used to lift the frame body 1 and drive the limiting mechanism 4 to abut against the connecting mechanism 2 so that the universal wheels 11 move to the bottom of the frame body 1.

[0036] The connecting mechanism 2 drives each universal wheel 11 to move, the driving mechanism 3 controls the limiting mechanism 4, the limiting mechanism 4 abuts against the connecting mechanism 2, and the driving mechanism 3 lifts the frame body 1 so that the universal wheels 11 move to the bottom of the frame body 1; the limiting mechanism 4 moves away from the connecting mechanism 2, and the gravity of the frame body 1 itself causes the universal wheels 11 to automatically retract into the frame body 1, realizing the storage of each universal wheel 11 during loading and unloading of goods, with the frame body 1 as the support; when moving the frame body 1, the universal wheels 11 support the frame body 1 to move, reducing the load on the universal wheels 11 and effectively reducing the damage rate of each universal wheel 11.

[0037] The connecting mechanism 2 includes a connecting frame 21, two mounting seats 22, two first hinge shafts 23 and two second hinge shafts 24. A part of the universal wheels 11 are arranged on one of the mounting seats 22, and the other part of the universal wheels 11 are arranged on the other mounting seat 22; the two first hinge shafts 23 are arranged in parallel at intervals, the connecting frame 21 is located between the two first hinge shafts 23, the connecting frame 21 and one of the mounting seats 22 are hinged through one of the first hinge shafts 23, and the connecting frame 21 and the other mounting seat 22 are hinged through the other first hinge shaft 23; the two second hinge shafts 24 are arranged in parallel at intervals, and the two second hinge shafts 24 are parallel to the two first hinge shafts 23; the two second hinge shafts 24 are fixed in the frame body 1, the two mounting seats 22 are located between the two second hinge shafts 24, one of the mounting seats 22 is hinged to one of the second hinge shafts 24, and the other mounting seat 22 is hinged to the other second hinge shaft 24; the limiting mechanism 4 is detachably connected to the connecting frame 21, and the frame body 1 is used to press down when the limiting mechanism 4 moves away from the connecting frame 21, so that the two mounting seats 22 rotate upward along the connected second hinge shafts 24, moving each universal wheel 11 into the frame body 1; the limiting mechanism 4 is used to abut against the connecting frame 21 and move vertically in the direction of the ground when the driving mechanism 3 lifts the frame body 1, so that the connecting frame 21 drives the two mounting seats 22 to move vertically downward along the connected second hinge shafts 24, moving each universal wheel 11 to the bottom of the frame body 1.

[0038] Specifically, two universal wheels 11 are provided on one mounting base 22, and two universal wheels 11 are also provided on the other mounting base 22.

[0039] Two guide columns 12 are arranged inside the frame body 1, and the two guide columns 12 are arranged vertically and at intervals; the connecting frame 21 includes a third hinge shaft 25, two guide seats 26 and a plurality of connecting rods 27. The third hinge shaft 25 is parallel to the first hinge shaft 23, and the third hinge shaft 25 is located between the two first hinge shafts 23. One end of each connecting rod 27 is hinged to the third hinge shaft 25, one part of the other ends of the connecting rods 27 is hinged to one of the first hinge shafts 23, and the other part of the other ends of the connecting rods 27 is hinged to the other first hinge shaft 23; the third hinge shaft 25 is located between the two guide columns 12, the third hinge shaft 25 is perpendicular to the two guide columns 12 respectively, one end of the third hinge shaft 25 is slidably connected to one of the guide columns 12 through one of the guide seats 26, and the other end of the third hinge shaft 25 is slidably connected to the other guide column 12 through the other guide seat 26. The arrangement of the two guide columns 12 enables the whole connecting frame 21 to move vertically, ensuring the stability of pulling the two mounting bases 22.

[0040] Specifically, the connecting frame 21 includes four connecting rods 27. Two of the connecting rods 27 are hinged to one of the first hinge shafts 23, and the other two connecting rods 27 are hinged to the other first hinge shaft 23. The third hinge shaft 25, the four connecting rods 27 and the two first hinge shafts 23 form a triangular support, which can effectively ensure the stability of the connecting frame 21.

[0041] The driving mechanism 3 includes a connecting shaft 31 and a control frame 32. The connecting shaft 31 is horizontally arranged on the side of each mounting base 22 away from the limiting mechanism 4; the control frame 32 is located on the side of the connecting frame 21 away from the limiting mechanism 4, and the control frame 32 is located between the two first hinge shafts 23; one end of the control frame 32 is hinged to the connecting shaft 31, the other end of the control frame 32 extends out of the frame body 1, and a plurality of pulleys 33 are arranged on the side of the control frame 32 away from the connecting frame 21; the control frame 32 is used to rotate downward along the connecting shaft 31 so that each pulley 33 abuts against the ground to support the frame body 1. By stepping on the control frame 32, the user makes each pulley 33 slide in contact with the ground, reducing the difficulty of the control frame 32 in supporting the frame body 1.

[0042] Specifically, two pulleys 33 are provided on the control frame 32.

[0043] The frame body 1 is provided with a limit block 13. The limit block 13 is used to limit the distance that the control frame 32 rotates downward along the connecting shaft 31, so that when the limit block 13 abuts against the control frame 32, the control frame 32 supports the frame body 1 through each pulley 33; a tension spring 34 is arranged between the control frame 32 and the connecting frame 21. One end of the tension spring 34 is connected to the control frame 32, and the other end of the tension spring 34 is connected to the connecting frame 21. The setting of the limit block 13 ensures that when the control frame 32 is in the limit state of being pressed down, the control frame 32 is in a horizontal state, and each pulley 33 supports the frame body 1, which is convenient for each universal wheel 11 to be adjusted to the bottom of the frame body 1. The setting of the tension spring 34 can increase the height of the control frame 32 in the unused state, thereby reducing the distance that the control frame 32 horizontally extends out of the frame body 1 and avoiding the control frame 32 from tripping up the staff.

[0044] Specifically, the driving mechanism 3 further includes a limit shaft 14 and another connecting shaft 31. The two connecting shafts 31 are arranged in parallel at intervals, and the two connecting shafts 31 are located in the same horizontal plane; the connecting shaft 31 is located on the side of each mounting seat 22 facing the limiting mechanism 4. The limit shaft 14 and the two connecting shafts 31 are perpendicular to the first hinge shaft 23. The limit shaft 14 and the two connecting shafts 31 are used to limit the vertical moving distance of the first hinge shaft 23, so that the limiting mechanism 4 is aligned with the connecting frame 21.

[0045] Specifically, the limit shaft 14 extends to one end of the frame body 1 away from the control frame 32. This avoids the connecting shaft 31 affecting the up and down movement of the control frame 32.

[0046] The limiting mechanism 4 includes a reset structure 5, a limit post 41 and a hinge seat 42. The hinge seat 42 is fixed inside the frame body 1, and the hinge seat 42 is located above the connecting frame 21; the limit post 41 is located between the hinge seat 42 and the connecting frame 21. The limit post 41 is arranged vertically. The top end of the limit post 41 is hinged to the hinge seat 42. The axial direction of the limit post 41 along the rotation direction of the hinge seat 42 is parallel to the first hinge shaft 23; the reset structure 5 is arranged on one side of the hinge seat 42. The output end of the reset structure 5 is hinged to the limit post 41. The driving mechanism 3 drives and resets the reset structure 5. The driving mechanism 3 is used to control the reset structure 5 to drive the limit post 41 to rotate along the hinge seat 42, so that the limit post 41 moves away from the connecting frame 21, or the end of the limit post 41 away from the hinge seat 42 abuts against the connecting frame 21.

[0047] Specifically, the improved mobile climbing ladder further includes a controller. A micro motor is arranged inside the limit post 41. A stud is arranged at one end of the limit post 41 away from the hinge seat 42, and the stud is arranged vertically. The output end of the micro motor is connected to the top of the stud, and a pressure sensor is arranged at the bottom of the stud. The pressure sensor is used to detect whether it touches the pressing piece when the reset structure 5 drives the limit post 41 to abut against the connecting frame 21. A threaded hole is opened at the top end of the connecting frame 21, and a compression spring and a pressing piece are arranged in the threaded hole. One end of the compression spring is connected to the bottom of the threaded hole, and the other end of the compression spring is connected to the pressing piece. The stud is used to be coaxially arranged with the threaded hole when the limit post 41 abuts against the connecting frame 21. The controller is electrically connected to the micro motor and the pressure sensor. The controller is used to receive the pressure signal of the pressing piece touching the pressure sensor, and control the micro motor to drive the stud to rotate according to the pressure signal, so that the stud is threadedly connected with the threaded hole, and the relative positions of the limit post 41 and the connecting frame 21 are fixed.

[0048] The reset structure 5 includes a connecting cable 51, a first sleeve 52, a rebounder 53, a first guide wheel 54 and a fixing sleeve 55. The first sleeve 52 is horizontally arranged on one side of the hinge seat 42. One end of the first sleeve 52 is close to the hinge seat 42. The fixing sleeve 55, the rebounder 53 and the first guide wheel 54 are arranged inside the first sleeve 52. The fixing sleeve 55 is close to the hinge seat 42, the first guide wheel 54 is away from the hinge seat 42, and the rebounder 53 is arranged between the fixing sleeve 55 and the first guide wheel 54. The output end of the rebounder 53 is connected to the fixing sleeve 55. One end of the fixing sleeve 55 away from the rebounder 53 is used as the output end of the reset structure 5 and is hinged to the limit post 41. One end of the connecting cable 51 is connected to the fixing sleeve 55, and the other end of the connecting cable 51 is connected to the driving mechanism 3 after being redirected by the first guide wheel 54. The driving mechanism 3 is used to pull down the connecting cable 51 to drive the fixing sleeve 55 to touch the rebounder 53, so that the rebounder 53 drives the fixing sleeve 55 to push the limit post 41 away from the connecting frame 21. Stepping on the driving mechanism 3 drives the fixing sleeve 55 to trigger the telescopic output end of the rebounder 53 through the connecting cable 51, realizing the control of the movement of the limit post 41.

[0049] Specifically, a guiding structure 6 is further arranged outside the reset structure 5. The guiding structure 6 includes a second sleeve and two second guide wheels. The second sleeve is fixed at a position below the first sleeve 52. One of the second guide wheels is located directly below the first guide wheel, and the other second guide wheel is located above the position where the connecting cable 51 is connected to the driving mechanism 3. In this way, it is more convenient for the connecting cable 51 to drive the fixing sleeve 55 to move, reducing the wear of the connecting cable 51 and the operation failure rate.

[0050] A cross bar 43 is arranged on one side of the limit post 41 away from the reset structure 5; a flexible layer is arranged at one end of the limit post 41 away from the hinge seat 42. The cross bar 43 can facilitate the direct pushing of the limit post 41 by manpower. The setting of the flexible layer makes the connection between the limit post 41 and the connecting frame 21 tight.

[0051] Specifically, a limit post 41 is provided with a control button for controlling the opening and closing of the micro motor; the flexible layer is arranged around the stud.

[0052] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An improved mobile climbing ladder, characterized in that, It includes a frame body, a number of universal wheels, as well as a connection mechanism, a driving mechanism and a limiting mechanism arranged in the frame body. The connection mechanism connects each of the universal wheels. The limiting mechanism is detachably connected to the connection mechanism. The limiting mechanism is used to press down and abut against the connection mechanism so that the connection mechanism drives the universal wheels to move to the bottom of the frame body to drive the frame body to move. The driving mechanism drives and connects the limiting mechanism. The driving mechanism is used to drive the limiting mechanism away from the connection mechanism so that the connection mechanism, due to the gravity of the frame body pressing down, retracts the universal wheels into the frame body. The driving mechanism is also used to lift the frame body and drive the limiting mechanism to abut against the connection mechanism so that the universal wheels move to the bottom of the frame body. The connection mechanism includes a connection frame, two mounting seats, two first hinge shafts and two second hinge shafts. One part of the universal wheels is arranged on one of the mounting seats, and the other part of the universal wheels is arranged on the other mounting seat. The two first hinge shafts are arranged in parallel at intervals. The connection frame is located between the two first hinge shafts. The connection frame and one of the mounting seats are hinged through one of the first hinge shafts, and the connection frame and the other mounting seat are hinged through the other first hinge shaft. The two second hinge shafts are arranged in parallel at intervals. The two second hinge shafts are parallel to the two first hinge shafts. The two second hinge shafts are fixedly arranged in the frame body. The two mounting seats are located between the two second hinge shafts. One of the mounting seats is hinged to one of the second hinge shafts, and the other mounting seat is hinged to the other second hinge shaft. The limiting mechanism is detachably connected to the connection frame. The frame body is used to press down when the limiting mechanism moves away from the connection frame so that the two mounting seats rotate upward along the connected second hinge shafts to move each of the universal wheels into the frame body. The limiting mechanism is used to abut against the connection frame and move vertically in the direction of the ground when the driving mechanism lifts the frame body so that the connection frame drives the two mounting seats to move vertically downward along the connected second hinge shafts to move each of the universal wheels to the bottom of the frame body.

2. The improved mobile climbing ladder according to claim 1, wherein Two guide columns are arranged in the frame body. The two guide columns are arranged vertically and at intervals. The connection frame includes a third hinge shaft, two guide seats and a number of connecting rods. The third hinge shaft is parallel to the first hinge shaft. The third hinge shaft is located between the two first hinge shafts. One end of each of the connecting rods is hinged to the third hinge shaft. The other ends of one part of the connecting rods are hinged to one of the first hinge shafts, and the other ends of the other part of the connecting rods are hinged to the other first hinge shaft. The third hinge shaft is located between the two guide columns. The third hinge shaft is perpendicular to the two guide columns respectively. One end of the third hinge shaft is slidably connected to one of the guide columns through one of the guide seats, and the other end of the third hinge shaft is slidably connected to the other guide column through the other guide seat.

3. An improved mobile climbing ladder according to claim 1, characterized in that, The driving mechanism includes a connecting shaft and a control frame. The connecting shaft is horizontally arranged on the side of each mounting seat away from the limiting mechanism. The control frame is located on the side of the connecting frame away from the limiting mechanism and between the two first hinge shafts. One end of the control frame is hinged to the connecting shaft, and the other end of the control frame extends out of the frame body. A plurality of pulleys are arranged on the side of the control frame away from the connecting frame. The control frame is used to rotate downward along the connecting shaft so that each pulley abuts against the ground to support the frame body.

4. An improved mobile climbing ladder according to claim 3, characterized in that, The frame body is provided with a limiting block. The limiting block is used to limit the distance that the control frame rotates downward along the connecting shaft so that when the limiting block abuts against the control frame, the control frame supports the frame body through each pulley. A tension spring is arranged between the control frame and the connecting frame. One end of the tension spring is connected to the control frame, and the other end of the tension spring is connected to the connecting frame.

5. An improved mobile climbing ladder according to any one of claims 1-4, characterized in that, The limiting mechanism includes a reset structure, a limiting column and a hinge seat. The hinge seat is fixed inside the frame body and is located above the connecting frame. The limiting column is located between the hinge seat and the connecting frame. The limiting column is vertically arranged. The top end of the limiting column is hinged to the hinge seat. The axial direction of the limiting column along the rotation direction of the hinge seat is parallel to the first hinge shaft. The reset structure is arranged on one side of the hinge seat. The output end of the reset structure is hinged to the limiting column. The driving mechanism is drivingly connected to the reset structure. The driving mechanism is used to control the reset structure to drive the limiting column to rotate along the hinge seat so that the limiting column moves away from the connecting frame or the end of the limiting column away from the hinge seat abuts against the connecting frame.

6. The improved mobile climbing ladder according to claim 5, characterized in that, The reset structure includes a connecting cable, a first sleeve, a rebounder, a first guide wheel and a fixed sleeve. The first sleeve is horizontally arranged on one side of the hinge seat. One end of the first sleeve is arranged close to the hinge seat. The fixed sleeve, the rebounder and the first guide wheel are arranged inside the first sleeve. The fixed sleeve is arranged close to the hinge seat. The first guide wheel is arranged away from the hinge seat. The rebounder is arranged between the fixed sleeve and the first guide wheel. The output end of the rebounder is connected to the fixed sleeve. The end of the fixed sleeve away from the rebounder is used as the output end of the reset structure and is hinged to the limiting column. One end of the connecting cable is connected to the fixed sleeve, and the other end of the connecting cable is connected to the driving mechanism after being redirected by the first guide wheel. The driving mechanism is used to pull the connecting cable downward to drive the fixed sleeve to touch the rebounder so that the rebounder drives the fixed sleeve to push the limiting column away from the connecting frame.

7. The improved mobile access ladder according to claim 5, wherein, A cross column is arranged on the side of the limiting column away from the reset structure. A flexible layer is arranged at the end of the limiting column away from the hinge seat.

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