Connecting mechanism for pedal and stand column of ladder

Abstract

The utility model discloses a connecting mechanism for a pedal and a stand column of a ladder, and belongs to the technical field of ladder accessories. The pedal comprises a main pipe and a pedal, the main pipe is connected with the pedal through a connecting piece, the connecting piece is fixedly connected with the main pipe, the pedal is detachably connected with the connecting piece, at least two pedal connecting parts used for being connected with the pedal are arranged on the connecting piece, the pedal connecting parts are arranged in different directions of the connecting piece, and locking parts are arranged on the pedal. And the pedal is connected with the pedal connecting part through the locking part. According to the ladder, the main pipe and the pedals are detachably and stably connected through the connecting pieces, the ladder is convenient to disassemble and assemble due to the detachable pedal design, the occupied space is reduced, the pedal connecting parts used for connecting the pedals in different directions are arranged on the connecting pieces, the connecting directions of the pedals can be freely selected, and the ladder is convenient to disassemble and assemble. The pedal connecting direction can be selected according to actual use requirements, connection is stable, use is convenient and fast, and the use space is more flexible.

Description

Technical Field

[0001] The utility model belongs to the technical field of ladder accessories, and more specifically relates to a connecting mechanism between a step and a column of a ladder. Background Art

[0002] Ladders are commonly used tools for climbing, usually divided into straight ladders, herringbone ladders, telescopic ladders, etc. Ladders play an extremely important role in engineering and daily life, and the convenience and stability of ladders when in use become the key issues in the use of ladders.

[0003] Most of the ladders currently used are single-column or double-column structures. The pedals arranged on the columns are mostly non-detachable or have complex connection structures, which are inconvenient to disassemble and carry. Moreover, the pedals can only be assembled and used in a fixed manner during installation. Due to the limitation of installation space, the use scenarios of the ladder are limited, and it is inconvenient to use. Utility Model Content

[0004] The utility model aims at solving the technical problems existing in the prior art and provides a connecting mechanism between a step and a column of a ladder.

[0005] In order to solve the above technical problems, the utility model includes a main pipe and a pedal, the main pipe is connected to the pedal through a connecting piece, the connecting piece is fixedly connected to the main pipe, the pedal is detachably connected to the connecting piece, and at least two pedal connecting parts for connecting the pedals are provided on the connecting piece, and the multiple pedal connecting parts are arranged at different positions of the connecting piece, and a locking part is provided on the pedal, and the pedal is connected to the pedal connecting part through the locking part.

[0006] Preferably, the connecting member includes a main pipe connecting portion, the pedal connecting portion is connected to the main pipe via the main pipe connecting portion, the pedal connecting portion is a perforated structure penetrating the main pipe connecting portion and the main pipe, and the end of the pedal connecting portion protrudes beyond the outer circumference of the main pipe.

[0007] Preferably, the connecting member includes two pedal connecting parts, namely a first pedal connecting part and a second pedal connecting part, and the two pedal connecting parts are arranged at an angle of 180°, and a locking structure adapted to be connected to the locking part is arranged on the pedal connecting part.

[0008] Preferably, the pedal connecting portion includes a pedal connecting tube, a locking hole is provided on the pedal connecting tube, an internal thread structure is provided inside the locking hole, and the locking portion includes an external thread structure adapted to be connected to the locking hole.

[0009] Preferably, the pedal includes at least one locking portion arranged in the middle or at the end thereof, and the pedal is detachably and adaptably connected to the pedal connecting portion via the locking portion.

[0010] Preferably, a locking portion is provided on the pedal, and the locking portion is a threaded structure provided on the outer peripheral surface of the pedal, and the axial length of the locking portion is adapted to the axial size of the pedal connecting portion.

[0011] Preferably, two locking parts are provided on the pedal, namely a first locking part and a second locking part, and the two locking parts are respectively connected to the two pedal connecting parts.

[0012] Preferably, the first locking portion and the second locking portion are spaced apart along the axial direction of the pedal, and the axial spacing between the two locking portions is matched with the axial spacing between the two pedal connecting portions.

[0013] Preferably, a reinforcing portion is provided on the pedal connecting portion, and the pedal connecting portion is connected to the locking portion via the reinforcing portion, and the reinforcing portion is provided at an end portion away from the use end of the pedal.

[0014] Preferably, the connecting piece is a symmetrical structure, the pedal connecting part and the main pipe connecting part are vertically arranged, and the main pipe connecting part includes a main pipe connecting hole, and the connecting piece is fixedly connected to the main pipe through the main pipe connecting hole.

[0015] Preferably, the configuration specifications of the plurality of pedal connecting parts are the same.

[0016] Preferably, a dustproof portion is provided on the pedal connecting portion, the dustproof portion is arranged at an end portion away from the use end of the pedal, and the dustproof portion is detachably connected to the pedal connecting portion.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model realizes detachable and stable connection between the main pipe and the foot pedal through the connecting piece. The detachable foot pedal structure design makes the ladder easy to disassemble and install, reduces space occupation, and is convenient to carry. In addition, a plurality of foot pedal connecting parts for connecting the foot pedals in different directions are arranged on the connecting piece. The connection direction of the foot pedal can be freely selected, and the foot pedal connection direction can be selected according to actual use requirements. The foot pedal is connected to the foot pedal connecting part through the locking part, and the connection is stable, easy to use, and the use space is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2It is a schematic diagram of the structure decomposition of the utility model;

[0022] Figure 3 This is a structural schematic diagram of the main pedal through hole of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the connecting piece of the utility model;

[0024] Figure 5 This is a schematic diagram of the connection between the connector and the main pipe of the utility model;

[0025] Figure 6 This is a schematic diagram of the exploded connection of the first embodiment of the pedal of the utility model;

[0026] Figure 7 This is a structural schematic diagram of a first embodiment of the pedal of the utility model;

[0027] Figure 8 This is a schematic diagram of the connection decomposition of the second embodiment of the pedal of the utility model.

[0028] Explanation of symbols in the figure:

[0029] 1. Main pipe; 11. Pedal through hole; 2. Pedal; 3. Connector; 31. Main pipe connecting part; 32. Main pipe connecting hole; 33. Rivet connecting hole; 4. Pedal connecting part; 41. First pedal connecting part; 411. First locking hole; 42. Second pedal connecting part; 421. Second locking hole; 5. Locking part; 51. Locking part a; 52. First locking part b; 53. Second locking part b; 61. First bolt fixing hole; 62. Second bolt fixing hole; 7. Bolt and nut connecting assembly; 8. Dust cap. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] See also Figure 1 , Figure 2 The utility model provides a connection mechanism between a step and a column of a ladder, comprising a main pipe 1 and a step 2, the main pipe 1 is connected to the step 2 through a connecting piece 3, the connecting piece 3 is fixedly connected to the main pipe 1, the step 2 is detachably connected to the connecting piece 3, and at least two step connection parts 4 for connecting the step are provided on the connecting piece 3, and the plurality of step connection parts 4 are arranged at different positions of the connecting piece 3, a locking part 5 is provided on the step 2, and the step 2 is connected to the step connection part 4 through the locking part 5.

[0032] The utility model realizes a detachable and stable connection between the main pipe 1 and the pedal 2 through the connecting piece 3. The detachable pedal design makes the ladder easy to disassemble and install, reduces space occupation, and is convenient to carry. In addition, a plurality of pedal connecting parts 4 for connecting the pedals in different directions are arranged on the connecting piece 3. The pedal 2 can freely select the connection direction, and the pedal connection direction can be selected according to actual use requirements. The pedal 2 is connected to the pedal connecting part 4 through the locking part 5. The connection is stable, easy to use, and the use space is more flexible.

[0033] Specifically, Figure 3 As shown, the main pipe 1 is a hollow circular tube structure, which is convenient for installation and splicing and assembling of multi-section structures. A single main pipe or multiple main pipes are spliced ​​to form a ladder column structure. A footrest through hole 11 is provided on the side of the main pipe 1. The size of the footrest through hole 11 matches the diameter of the footrest 2, so that the footrest 2 can pass through the footrest through hole 11 to achieve stable connection and installation of the footrest 2.

[0034] In this embodiment, Figure 4 As shown, the connecting member 3 as a whole is a connecting structure provided with a plurality of mounting through holes, and the connecting member 3 includes a main pipe connecting portion 31 and a pedal connecting portion 4, the pedal connecting portion 4 is connected to the main pipe connecting portion 31, the main pipe connecting portion 31 is fixedly connected to the main pipe 1, and the pedal connecting portion 4 is connected to the main pipe 1 through the main pipe connecting portion 31.

[0035] Specifically, the main pipe connection part 31 is a hollow circular tube structure, and the main pipe connection part 31 includes a main pipe connection hole 32, which is arranged inside the main pipe connection part 31, and the diameter of the main pipe connection hole 32 is adapted to the outer diameter of the main pipe 1, so that the connector 3 is sleeved on the main pipe 1 through the main pipe connection part 31, and then fixed by a fastener. A plurality of rivet connection holes 33 are evenly arranged in the circumferential direction of the main pipe connection part 31, and rivet fixing holes are arranged on the outer circumference of the main pipe 1, and the number and specifications of the rivet connection holes 33 are adapted to the rivet fixing holes arranged on the main pipe 1, so that the connector 3 is fixedly connected to the main pipe 1 through a plurality of rivets.

[0036] Furthermore, in the present embodiment, four rivet connection holes 33 are evenly distributed along the circumference of the upper peripheral side and the lower peripheral side of the main pipe connection part 31, and the upper and lower rivet connection holes are arranged in the same manner, and the distances from the upper and lower end surface edges are also the same. The rivet fixing holes and the rivet connection holes 33 are arranged in exactly the same size, and the main pipe 1 and the connecting member 3 are stably connected by eight connecting rivets. The quantitative structure is convenient for installation and repeated use. Moreover, by consolidating the connecting member 3 and the main pipe 1 into a whole, when installing the ladder, it is only necessary to screw the end of the footrest 2 into the footrest connection part 4 of the connecting member 3 to complete the connection and fixation of the footrest 2, and the installation is convenient.

[0037] Furthermore, in this embodiment, the main pipe 1 and the connecting member 3 are firstly bonded and fixed and then riveted by screws, so that the connection is reliable and stable.

[0038] Specifically, Figure 4 , Figure 5 As shown, the pedal connection part 4 is a through-hole structure arranged on the main pipe connection part, and a locking structure adapted to be connected with the locking part is arranged on the pedal connection part 4.

[0039] In this embodiment, two pedal connecting parts 4 are arranged on the main pipe connecting part 31, which are a first pedal connecting part 41 and a second pedal connecting part 42 arranged at different positions of the main pipe connecting part 31, each pedal connecting part 4 is provided with a pedal connecting pipe, and a locking hole is arranged on the pedal connecting pipe, wherein the first pedal connecting part 41 is provided with a first locking hole 411, and the second pedal connecting part 42 is provided with a second locking hole 421, the first locking hole 411 and the second locking hole 421 are an integral structure or a split structure arranged through, and the connecting member 3 is detachably connected to the pedal 2 through the first locking hole 411 and the second locking hole 421, so as to realize the quick installation and disassembly of the pedal 2.

[0040] Furthermore, the first locking hole 411 and the second locking hole 421 are provided with internal thread structures, and the pedal 2 is provided with an external thread structure that is adaptively connected to the internal thread structure of the locking hole. The pedal 2 is threadedly connected to the locking hole of the pedal connecting part 4, which not only makes the connection of the pedal 2 more stable and convenient, simplifies the pedal connection method, but also the pedal 2 can choose the connection direction as needed, thereby realizing the detachable connection of the pedal 2, simple operation, and reducing the space occupied by the ladder. The adaptive threaded connection method prevents damage to the thread due to incorrect screwing, thereby increasing the service life of the ladder.

[0041] The utility model arranges two pedal connecting parts 4 in different directions on the main connecting part 31, and the pedal 2 can be screwed into the first locking hole 411 or the second locking hole 421 as needed to realize the connection between the pedal 2 and the connecting member 3. The pedal 2 can freely select the connection direction, and the connection method is the same, and a stable connection can be obtained, thereby improving the assembly designability of the ladder and making the use space more flexible.

[0042] Furthermore, in the present embodiment, the first pedal connection portion 41 and the second pedal connection portion 42 have the same structure, and the first pedal connection portion 41 and the second pedal connection portion 42 are both arranged perpendicularly to the main pipe connection portion 31, so that the pedal 2 connected to the pedal connection portion 4 is arranged perpendicularly to the main pipe 1, which is convenient for operators to step on and facilitate high-altitude climbing operations.

[0043] Furthermore, as a preferred embodiment of the utility model, a plurality of pedal connecting parts 4 of the same specifications can be provided on the connecting member 3, which can increase the range of installation angle selection, thereby improving the applicability of the ladder; and the pedal connecting part 4 can be a perforated structure that penetrates the main pipe connecting part 31 and the main pipe 1, and the end of the pedal connecting part 4 protrudes beyond the outer peripheral surface of the main pipe 1, so as to facilitate the installation and use of the pedal 2.

[0044] Furthermore, as a preferred embodiment of the utility model, the connecting member 3 is a symmetrical structure, the main pipe connecting portion 31 and the pedal connecting portion 4 can be an integral structure or a segmented welding mechanism, the two pedal connecting portions 4 are symmetrically arranged on the left and right sides of the main pipe connecting portion 31, and the first pedal connecting portion 41 and the second pedal connecting portion 42 are arranged at an angle of 180°, so that the first pedal connecting portion 41 and the second pedal connecting portion 42 are through-hole structures arranged in the same radial direction, which is convenient for the pedal 2 to freely select the connection direction according to actual usage requirements and usage space.

[0045] In this embodiment, the pedal 2 is a round rod-shaped structure and can be designed as a solid or hollow structure according to actual usage requirements. The pedal 2 is provided with at least one locking portion 5 arranged in the middle or end thereof, and the pedal 2 is detachably connected to the pedal connecting portion 4 through the locking portion 5.

[0046] Specifically, in the present invention, there are two ways to set the locking portion 5 on the pedal 2, as shown below.

[0047] Embodiment 1

[0048] like Figure 6 , Figure 7 As shown, in the present embodiment, a locking portion 5 is provided on the pedal 2, specifically a locking portion a51. The locking portion a51 is a long external thread structure provided on the outer peripheral side of the pedal 2. The external thread structure is adapted to the thread structure of the locking hole on the pedal connecting portion 4. The locking portion a51 is provided at one end where the pedal 2 is connected to the pedal connecting portion 4. The locking portion a51 can be connected with the first locking hole 411 and the second locking hole 421 on the pedal connecting portion 4 in sequence, so that the pedal 2 can be screwed into and connected from any locking hole of the pedal connecting portion 4.

[0049] Furthermore, the axial length of the locking portion a51 is compatible with the axial dimensions of the two pedal connecting portions 4, so that the locking portion a51 can be threadedly connected to the first pedal connecting portion 41 and the second pedal connecting portion 42 at the same time, thereby achieving a tight and stable connection between the pedal 2 and the connecting member 3.

[0050] Furthermore, due to the adaptability of the structural connection setting, the pedal 2 can threadably connect the locking portion a51 with the second locking hole 421, and then continue to screw in, so that the end of the locking portion a51 is threadably connected to the first locking hole 411, and the middle portion of the locking portion a51 is threadably connected to the second locking hole 421; at the same time, the pedal 2 can also threadably connect the end of the locking portion a51 with the first locking hole 411 from another direction, and then continue to screw in, so that the end of the locking portion a51 is threadably connected to the second locking hole 421, and the middle portion of the locking portion a51 is threadably connected to the first locking hole 411; thus, the utility model can freely select the pedal connection direction according to actual use requirements, so as to realize the close connection of the main pipe 1, the connecting member 3 and the pedal 2 into an integral structure, the connection is firm, and safe locking is achieved, the ladder is reliable to use, and has strong adaptability.

[0051] Embodiment 2

[0052] like Figure 8 As shown, in this embodiment, there are two locking parts 5 on the pedal, namely the first locking part b52 and the second locking part b53. The two locking parts 5 correspond to the two pedal connecting parts 4 on the connecting member 3 respectively. Through the adaptation connection, the pedal 2 is connected to the main pipe 1 to achieve stable installation of the pedal 2.

[0053] In this embodiment, the first locking portion b52 and the second locking portion b53 are external thread structures arranged on the outer peripheral side of the pedal 2, and the external thread structure is adapted to the thread structure of the locking hole on the pedal connecting portion 4. The first locking portion b52 and the second locking portion b53 are arranged at intervals along the axial direction of the pedal 2. The first locking portion b52 is arranged at the end of the pedal 2, and the second locking portion b53 is arranged in the middle of the pedal 2. The thread structures arranged on the first locking portion b52 and the second locking portion b53 are the same, and both can be connected to the first locking hole 411 and the second locking hole 421 on the connecting member 3, so that the pedal 2 can be screwed into and connected from any locking hole on the connecting member 3.

[0054] In this embodiment, the axial spacing between the first locking portion b52 and the second locking portion b53 is the same as the spacing distance between the two pedal connecting portions 4 on the connecting member 3, and the radial dimension of the portion between the first locking portion b52 and the second locking portion b53 on the pedal 2 is smaller than the radial dimension of the locking portions at both ends, thereby ensuring that when the first locking portion b52 is threadedly connected to the pedal connecting portion 4, the middle portion without a thread can also pass through the pedal connecting portion 4 smoothly, so that the second locking portion b53 can also be connected to the pedal connecting portion 4.

[0055] Furthermore, due to the adaptability of the structural connection setting, the pedal 2 can threadably connect the first locking portion b52 with the second locking hole 421, and then continue to screw in, so that the first locking portion b52 is threadably connected to the first locking hole 411, and the second locking portion b53 is threadably connected to the second locking hole 421; at the same time, the pedal 2 can also threadably connect the first locking portion b52 with the first locking hole 411 from another direction, and then continue to screw in, so that the first locking portion b52 is threadably connected to the second locking hole 421, and the second locking portion b53 is threadably connected to the first locking hole 411; thereby, the pedal connection direction can be freely selected according to actual use requirements, so that the main pipe 1, the connecting member 3 and the pedal 2 are tightly connected into an integral structure, the connection is firm, and safe locking is achieved, the ladder is reliable to use, and has strong adaptability.

[0056] Furthermore, in the utility model, a reinforcement portion is provided on the pedal connection portion 4 of the connecting member 3, and the pedal connection portion 4 is further locked and connected with the locking portion 5 through the reinforcement portion. Through the secondary reinforcement connection, the structural connection is made more stable, thereby improving the stability and safety of the ladder.

[0057] Specifically, Figure 6 , Figure 8 As shown, both Embodiment 1 and Embodiment 2 are connected with a reinforcement part, and the reinforcement part includes a bolt fixing hole and a bolt and nut connection assembly 7. The outer peripheral sides of the first pedal connection part 41 and the second pedal connection part 42 are both provided with a first bolt fixing hole 61, and the first bolt fixing hole 61 is arranged to penetrate along the radial direction of the pedal connection part 4, and the connecting end of the pedal 2 is provided with a second bolt fixing hole 62, and the second bolt fixing hole 62 is arranged to penetrate the radial end of the locking part a51 and the radial end of the first locking part b52, so that when the pedal 2 is connected to the pedal connection part 4, the first bolt fixing hole 61 and the second bolt fixing hole 62 can correspond to each other, and then the pedal and the connecting member are reinforced under the action of the bolt and nut connection assembly. Under the reinforcing connection action of the threaded connection and the bolt and nut connection assembly 7, the main pipe 1, the connecting member 3 and the pedal 2 are stably connected into an integral structure, thereby ensuring the stable installation of the pedal 2 and the stability and safety of the ladder.

[0058] Furthermore, as a preferred embodiment of the utility model, a dustproof part is connected to the pedal connecting part 4 of the connecting piece 3, and the dustproof part includes a dustproof cap 8. The dustproof cap 8 prevents foreign matter from entering the pedal connecting part 4 and the main pipe 1, thereby extending the service life of the equipment and ensuring the performance and safety of the ladder.

[0059] Specifically, the dust cap 8 is detachably arranged on the end locking hole at one end where the pedal 2 is connected to the connecting piece 3 and away from the use end of the pedal 2. The dust cap 8 can be nested and connected with the first locking hole 411 and the second locking hole 421, so that the first locking hole 411 or the second locking hole 421 is blocked by the dust cap 8.

[0060] The utility model realizes a detachable and stable connection between the main pipe 1 and the foot pedal 2 through the connecting piece 3. The detachable foot pedal design makes the ladder easy to disassemble and install, and convenient to carry. In addition, a plurality of foot pedal connecting parts 4 for connecting the foot pedals in different orientations are arranged on the connecting piece 3. The connection direction of the foot pedal 2 can be freely selected, and the connection direction of the foot pedal 2 can be selected according to actual use requirements. The foot pedal 2 is connected to the foot pedal connecting part 4 through the locking part 5. The installation can be completed using a fixed connection method and connection position, which simplifies the installation steps, improves the assembly efficiency of the ladder, has a stable connection, is convenient to use, and has a more flexible use space.

[0061] The utility model consolidates the connector 3 and the main pipe 1 into an integral whole, so that when installing the ladder, it is only necessary to screw the end of the pedal 2 into the pedal locking hole of the connector 3. The pedal fixing method adopts an adaptive threaded connection method, which can be reused and is easy to operate. When not in use, the ladder can be disassembled and placed to reduce space occupation. The pedal 2 can be connected and fixed by screwing it into the connector 3 from different directions, and the installation is convenient. In addition, a dust cap 8 is embedded in the locking hole at the end of the connector 3 away from the pedal use end. The dust cap 8 plugs the first locking hole 411 or the second locking hole 421 to prevent debris from entering the main pipe 1. Under the threaded connection, the reinforced connection of the reinforcement part and the dustproof effect of the dust cap 8, the pedal 2 is stably connected and locked, thereby improving the stability and safety of the ladder.

[0062] In the description of the present invention, it should be understood that terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A connection mechanism for a step and a column of a ladder, comprising a main pipe and a step, wherein the main pipe is connected to the step through a connecting piece, and characterized in that: The connecting member is fixedly connected to the main pipe, the pedal is detachably connected to the connecting member, and at least two pedal connecting parts for connecting the pedals are provided on the connecting member, and the plurality of pedal connecting parts are arranged at different positions of the connecting member. The pedal is provided with a locking part, and the pedal is connected to the pedal connecting part via the locking part.

2. A connection mechanism between a step and a column of a ladder according to claim 1, characterized in that: The connecting member comprises a main pipe connecting portion, the pedal connecting portion is connected to the main pipe via the main pipe connecting portion, the pedal connecting portion is a perforated structure penetrating the main pipe connecting portion and the main pipe, and the end of the pedal connecting portion protrudes beyond the outer peripheral surface of the main pipe.

3. A connection mechanism between a step and a column of a ladder according to claim 1, characterized in that: The connecting member includes two pedal connecting parts, namely a first pedal connecting part and a second pedal connecting part, and the two pedal connecting parts are arranged at an angle of 180°. The pedal connecting part is provided with a locking structure adapted to be connected with the locking part.

4. A connection mechanism between a step and a column of a ladder according to claim 1 or 3, characterized in that: The pedal connecting part comprises a pedal connecting tube, a locking hole is arranged on the pedal connecting tube, an internal thread structure is arranged inside the locking hole, and the locking part comprises an external thread structure adapted to be connected with the locking hole.

5. A connection mechanism between a step and a column of a ladder according to claim 4, characterized in that: The pedal at least comprises a locking portion arranged in the middle or at the end thereof, and the pedal is detachably and adaptably connected to the pedal connecting portion via the locking portion.

6. A connection mechanism between a step and a column of a ladder according to claim 5, characterized in that: The pedal is provided with a locking portion, which is a threaded structure arranged on the outer peripheral surface of the pedal, and the axial length of the locking portion is adapted to the axial size of the pedal connecting portion.

7. A connection mechanism between a step and a column of a ladder according to claim 5, characterized in that: The pedal is provided with two locking parts, namely a first locking part and a second locking part, and the two locking parts are respectively connected to the two pedal connecting parts.

8. A connection mechanism between a step and a column of a ladder according to claim 7, characterized in that: The first locking portion and the second locking portion are arranged at intervals along the axial direction of the pedal, and the axial spacing between the two locking portions is matched with the axial spacing between the two pedal connecting portions.

9. A connection mechanism between a step and a column of a ladder according to claim 1, characterized in that: The pedal connection portion is provided with a reinforcement portion, through which the pedal connection portion is connected to the locking portion, and the reinforcement portion is provided at an end portion away from the use end of the pedal.

10. A connection mechanism between a step and a column of a ladder according to claim 2, characterized in that: The connecting piece is a symmetrical structure, the pedal connecting part and the main pipe connecting part are vertically arranged, and the main pipe connecting part includes a main pipe connecting hole, and the connecting piece is fixedly connected to the main pipe through the main pipe connecting hole.

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