Swimming pool cleaning robot with crawler belt lap joint structure

By setting the track lap structure and the first meshing structure on the wheel of the swimming pool cleaning robot, a limit structure is formed, and an anti-detachment structure is set on the inner surface of the track, the problem of track looseness is solved, and the stability and efficient cleaning of the robot when moving the swimming pool surface is achieved.

CN222862999UActive Publication Date: 2025-05-13SUZHOU SMOROBOT TECH CO LTD
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Patent Information

Application Number
CN202290000882.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2022-02-09
Publication Date
2025-05-13
Estimated Expiration
2032-02-09

AI Technical Summary

Technical Problem

The tracks of the swimming pool cleaning robot are easily loosened during use, causing the robot to slip or lose its stability when moving underwater or on a wall.

Method used

A swimming pool cleaning robot with a track lap structure is designed. By setting a track lap structure and a first meshing structure on the wheel, a limit structure is formed. The anti-detachment structure arranged on the inner surface of the track is lapped on the track lap structure to ensure that the track will not detach during movement.

Benefits of technology

It effectively avoids the problem of loose tracks, ensures the stability and reliability of the swimming pool cleaning robot when moving on the swimming pool surface, and improves the cleaning efficiency.

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Abstract

One or more embodiments of the utility model provide a swimming pool cleaning robot with a crawler belt lap joint structure. The swimming pool cleaning robot comprises a cleaning main body and a crawler belt lap joint structure, the driving mechanism comprises a wheel, the wheel is rotatably arranged on the cleaning main body, the wheel comprises a crawler belt lap joint structure and a first meshing structure, and the crawler belt lap joint structure and the first meshing structure are sequentially arranged in the axis direction of the wheel, so that a limiting structure is formed on the wheel or between the wheel and the cleaning main body; the crawler belt is arranged outside the wheels in a sleeving mode, at least part of the crawler belt is meshed with the first meshing structure so that the crawler belt can be driven by the wheels to move, an anti-disengaging structure is arranged on the inner surface of the crawler belt, and the anti-disengaging structure is in lap joint with the crawler belt lap joint structure. And the position of the crawler belt is fixed through the cooperation of the anti-falling structure arranged on the inner surface of the crawler belt and the limiting structure, so that the problem that the crawler belt gets loose is solved.
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Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of cleaning devices, and in particular to a swimming pool cleaning robot with a track overlap structure. Background Art

[0002] The pool cleaning robot is a cleaning robot developed for the cleaning needs of swimming pools. It can repeatedly clean the bottom and walls of the swimming pool and filter the water in the swimming pool. During the working process, the pool cleaning robot cleans the pollutants on the surface of the swimming pool by rolling the roller brush.

[0003] In order to ensure that the pool cleaning robot does not slip when moving underwater or on a wall, the pool cleaning robot is equipped with tracks to drive the pool cleaning robot to move reliably and stably. However, as the pool cleaning robot is used, the tracks may become loose. Summary of the invention

[0004] In order to solve the above problems, an embodiment of the present application provides a swimming pool cleaning robot with a crawler overlapping structure to at least partially solve the above problems.

[0005] One or more embodiments of the present application provide a swimming pool cleaning robot with a track overlapping structure, comprising: a cleaning body; a driving mechanism, the driving mechanism comprising: a wheel, the wheel is rotatably arranged on the cleaning body, the wheel comprises a track overlapping structure and a first meshing structure, the track overlapping structure and the first meshing structure are arranged in sequence in the axial direction of the wheel to form a limiting structure on the wheel or between the wheel and the cleaning body; a track, the track is sleeved outside the wheel, and at least a part of the track is meshed with the first meshing structure, so that the track moves under the drive of the wheel, and the inner surface of the track is provided with an anti-slip structure, and the anti-slip structure is overlapped on the track overlapping structure.

[0006] Optionally, the wheel also includes a wheel body, a first meshing structure is arranged on the outer peripheral surface of the wheel body and protrudes radially along the wheel body, the width of the first meshing structure in the axial direction of the wheel is smaller than the width of the wheel body in the axial direction to form a track overlapping structure, and when the wheel body is rotatably connected to the cleaning body, a limiting structure is formed by the first meshing structure, the track overlapping structure and the cleaning body, and the anti-slip structure arranged on the inner surface of the track extends into the limiting structure.

[0007] Optionally, the cleaning body includes a bearing shell. When the wheel is connected to the cleaning body, a limiting structure is formed by the first meshing structure, the track overlapping structure and the bearing shell, and the anti-slip structure provided on the inner surface of the track extends into the limiting structure.

[0008] Optionally, the cleaning body includes a protective cover plate, which is detachably connected to the wheel. A limiting structure is formed by the first engaging structure, the track overlapping structure and the protective cover plate, and the anti-slip structure provided on the inner surface of the track extends into the limiting structure.

[0009] Optionally, the wheel also includes a baffle, which is arranged on the wheel body and protrudes radially along the wheel body. A limiting structure is formed by the first meshing structure, the track overlapping structure and the baffle, and the anti-slip structure arranged on the inner surface of the track extends into the limiting structure.

[0010] Optionally, the pool cleaning robot further comprises a decorative plate which is relatively sealed with the baffle plate and the crawler track to prevent pollutants from entering between the wheels and the crawler track.

[0011] Optionally, the limiting structure is a limiting groove, and the anti-slip structure provided on the inner surface of the track is a limiting protrusion that cooperates with the limiting groove.

[0012] Optionally, the first engagement structure comprises engagement grooves spaced apart along the circumference of the wheel, and at least a portion of the track that cooperates with the first engagement structure is an engagement tooth, which is arranged on the inner surface of the track and cooperates with the engagement grooves.

[0013] Optionally, the depth of the engagement groove in the radial direction of the wheel is smaller than the depth of the limiting groove in the radial direction of the wheel, and the height of the engagement tooth is smaller than the height of the limiting protrusion.

[0014] Optionally, the meshing teeth and the limiting protrusions are arranged in sequence in the width direction of the track.

[0015] Optionally, the limiting structure is continuous in the circumferential direction of the wheel.

[0016] Optionally, the outer circumferential surface of the crawler track is provided with anti-skid protrusions, and the anti-skid protrusions are arranged in sequence and at intervals along the circumference of the crawler track.

[0017] According to an embodiment of the present application, a swimming pool cleaning robot with a track overlapping structure is provided, wherein a cleaning body moves on the surface of the swimming pool through a driving mechanism to clean the swimming pool; the driving mechanism comprises wheels and tracks, the wheels are rotatably arranged on the cleaning body, and the track overlapping structure and the first meshing structure of the wheel are sequentially arranged in the axial direction of the wheel to form a limiting structure on the wheel or between the wheel and the cleaning body, so that when the track is engaged with the first meshing structure, the anti-slip structure arranged on its inner surface is overlapped on the track overlapping structure, thereby falling into the limiting structure; at least a portion of the track is engaged with the first meshing structure of the wheel, so that the wheel drives the track to move, thereby driving the cleaning body to move; the anti-slip structure arranged on the inner surface of the track cooperates with the limiting structure to fix the position of the track, thereby avoiding the problem of the track loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are intended only to illustrate and explain the present application, and do not limit the scope of the present application.

[0019] Figure 1 This is a schematic diagram of the structure of a swimming pool cleaning robot with a crawler overlapping structure of the present application;

[0020] Figure 2 It is a structural schematic diagram of a crawler of a swimming pool cleaning robot with a crawler overlapping structure according to the present application;

[0021] Figure 3 This is a schematic diagram of the main structure of a swimming pool cleaning robot with a crawler overlapping structure of the present application;

[0022] Figure 4 It is a three-dimensional structural diagram of the wheels and protective cover of a swimming pool cleaning robot with a crawler overlapping structure of the present application;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of a wheel with a baffle of a swimming pool cleaning robot with a crawler overlapping structure of the present application;

[0024] Figure 6 It is a structural schematic diagram of the coordination of a track overlap structure, a wheel body and a first meshing structure of a swimming pool cleaning robot with a track overlap structure of the present application;

[0025] Figure 7 It is an exploded view of a swimming pool cleaning robot with a track overlapping structure according to the present application.

[0026] Description of reference numerals:

[0027] 1. Cleaning body; 11. Carrying shell; 113. Upper shell; 114. Chassis; 115. Water inlet; 116. Water outlet; 117. Movable flap; 12. Protective cover; 13. Filter structure; 14. Sealed cabin; 2. Driving mechanism; 21. Wheels; 211. First meshing structure; 212. Limiting structure; 213. Baffle; 214. Track overlap structure; 22. Track; 221. Meshing teeth; 222. Limiting protrusion; 3. Rolling brush mechanism. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the embodiments of the present application, the specific implementation methods of the embodiments of the present application are now described with reference to the accompanying drawings.

[0029] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0030] In order to simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one or more of the parts with the same structure or function are schematically drawn or only one or more of them are marked.

[0031] Before describing the structure of the swimming pool cleaning robot with a track overlapping structure (hereinafter referred to as the swimming pool cleaning robot) according to an embodiment of the present application, the application scenarios of the swimming pool cleaning robot are briefly described for ease of understanding.

[0032] Reference Figures 1 to 7 The swimming pool cleaning robot generally comprises a cleaning body 1, a roller brush mechanism 3 and a driving mechanism 2. The driving mechanism 2 comprises wheels 21 and tracks 22. The wheels 21 rotate to drive the meshing tracks 2 to drive the cleaning body 1 to move on the bottom wall and side walls of the swimming pool. The roller brush mechanism 3 is arranged on the cleaning body 1, and when the driving mechanism 2 drives the cleaning body 1 to move, the roller brush mechanism 3 is driven to rotate together, thereby cleaning the pollutants adhering to the bottom wall and side walls of the swimming pool.

[0033] In order to collect pollutants in the swimming pool, the cleaning body 1 includes a bearing shell 11, a filtering structure 13, a sealed cabin 14, etc. The bearing shell 11 includes an upper shell 113 and a bottom plate 114, and the upper shell 113 is detachably connected to the bottom plate 114. A water inlet 115 is provided on the bottom plate 114, and a water outlet 116 is provided on the upper shell 113. A reversible movable flap 117 can also be provided on the upper shell 113. The filtering structure 13 is arranged between the water inlet 115 and the water outlet 116 to ensure that the water and / or pollutants entering from the water inlet 115 are filtered by the filtering structure 13, and the pollutants are left in the bearing shell 11, and the water is separated from the pollutants, and the filtered water is discharged from the water outlet 116.

[0034] Since the driving mechanism 2 drives the meshing crawler 22 by rotating the wheels 21, the cleaning body 1 moves on the bottom wall and the side wall of the swimming pool. With the use of the swimming pool cleaning robot, the crawler 22 may become loose. Therefore, in order to solve the above technical problems, the embodiment of the present application provides a swimming pool cleaning robot with a crawler overlap structure to fix the position of the crawler 22, thereby avoiding the problem of the crawler 22 becoming loose.

[0035] Reference Figures 1 to 7One or more embodiments of the present application provide a swimming pool cleaning robot with a track overlapping structure, the swimming pool cleaning robot includes a cleaning body 1 and a driving mechanism 2, wherein the driving mechanism 2 includes a wheel 21 and a track 22, the wheel 21 is rotatably arranged on the cleaning body 1, the wheel 21 includes a track overlapping structure 214 and a first meshing structure 211, the track overlapping structure 214 and the first meshing structure 211 are sequentially arranged in the axial direction of the wheel 21 to form a limiting structure 212 on the wheel or between the wheel and the cleaning body 1; the track 22 is sleeved outside the wheel 21, and at least a portion of the track 22 is meshed with the first meshing structure 211, so that the track 22 moves under the drive of the wheel 21, and the inner surface of the track 22 is provided with an anti-slip structure, and the anti-slip structure is overlapped on the track overlapping structure 214 to cooperate with the track overlapping structure 214 to prevent the track 22 from falling off.

[0036] The wheel 21 of the embodiment of the present application includes a track overlapping structure 214 and a first meshing structure 211, and the track overlapping structure 214 and the first meshing structure 211 are arranged in sequence in the axial direction of the wheel 21, so that the track 22 can be limited without additionally increasing the wheel diameter and will not interfere with the rotation of the wheel.

[0037] Optionally, the limiting structure 212 is continuous in the circumferential direction of the wheel 21, so as to ensure that when the wheel 21 rotates to various angles, the track 22 can be prevented from falling off by utilizing the limiting structure 212 which is continuous in the circumferential direction of the wheel 21.

[0038] Exemplarily, the limiting structure 212 may be a limiting groove, and the anti-slip structure provided on the inner surface of the track 22 may be a limiting protrusion 222 cooperating with the limiting groove. The position of the track 22 is limited by the cooperation between the limiting groove and the limiting protrusion 222, thereby avoiding the problem of the track 22 loosening.

[0039] Optionally, the first meshing structure 211 includes meshing grooves (i.e., tooth grooves of a gear) spaced apart along the circumference of the wheel 21, and at least a portion of the crawler 22 that cooperates with the first meshing structure 211 is a meshing tooth 221, which is disposed on the inner surface of the crawler 22 and cooperates with the meshing grooves. The meshing grooves of the first meshing structure 211 cooperate with the meshing teeth 221 on the inner surface of the crawler 22, and when the wheel 21 rotates, the crawler 22 is driven to move, so as to drive the swimming pool robot to move on the surface of the swimming pool.

[0040] In order to effectively prevent the track from falling off, the radial depth of the engaging groove in the wheel 21 is smaller than the radial depth of the limiting groove in the wheel 21. In other words, the depth of the limiting groove is greater than the depth of the engaging groove, and the height of the engaging tooth 221 is smaller than the height of the limiting protrusion 222. In this way, when the engaging groove of the wheel 21 is engaged with the engaging tooth 221 of the track 22, the limiting protrusion 222 of the track 22 falls into the limiting groove, so that during the transmission process of the wheel 21 and the track 22, even if the track 22 becomes loose and is subjected to axial force, causing it to move relative to the wheel 21 in the axial direction of the wheel 21, the contact between the limiting protrusion 222 and the groove wall of the limiting groove will form a stop for the track 22 and prevent it from falling off.

[0041] Reference Figure 2 Optionally, the meshing teeth 221 and the limiting protrusions 222 of the crawler 22 are arranged in sequence in the width direction of the crawler 22, so as to adapt to various settings of the wheels 21.

[0042] In order to make the track move more smoothly in the swimming pool, anti-skid protrusions can be further provided on the outer circumferential surface of the track 22. The anti-skid protrusions are arranged in sequence at intervals along the circumference of the track 22. The anti-skid protrusions can be tooth-shaped. When the swimming pool robot moves on the surface of the swimming pool, the anti-skid protrusions can prevent the track 22 from slipping sideways on the surface of the swimming pool, so that the swimming pool robot can move reliably and smoothly.

[0043] Reference Figure 3 and Figure 6 In a specific embodiment, the wheel 21 further includes a wheel body, and the first meshing structure 211 is disposed on the outer peripheral surface of the wheel body and protrudes radially of the wheel body. For example, the first meshing structure 211 may be a plurality of gear teeth, each of which is parallel to the axis of the wheel 21 and arranged in sequence on the outer peripheral surface of the wheel body. The wheel 21 may mesh with the track 22 through the gear teeth to drive the track 22 to move.

[0044] The width of the first meshing structure 211 in the axial direction of the wheel 21 is smaller than the width of the wheel body in the axial direction to form a track overlap structure 214. In one case, the track overlap structure 214 can cooperate with other structures to form a limiting structure. Alternatively, in another case, the track overlap structure 214 can cooperate with other structures of the wheel 21 itself to form a limiting groove.

[0045] For example, in the case where the crawler track overlap structure 214 can cooperate with other structures of the wheel 21 itself to form a limiting structure, refer to Figure 5The wheel 21 may further include a baffle 213, which is disposed on the wheel body and spaced apart from the first meshing structure 211 in the axial direction of the wheel 213, so that the track overlap structure 214 stops the track through the baffle 213 on one side and stops the track through the first meshing structure 211 on the other side.

[0046] The baffle 213 may be configured as a detachable structure, which is more convenient for replacement and maintenance, or may be configured as an integrally formed baffle 213, which makes the connection more stable.

[0047] The baffle plate 213 protrudes in the radial direction of the wheel body. The baffle plate 213 can be a continuous annular baffle plate 213, or a plurality of teeth protruding in the radial direction of the wheel body arranged at intervals. The wheel uses the baffle plate 213, the crawler overlap structure 214 and the first meshing structure 211 to form a limiting structure 212. This structure is simpler, uses less materials, and saves costs.

[0048] In this case, in order to prevent pollutants from entering, the pool cleaning robot further includes a decorative plate (not shown in the figure), which is relatively sealed between the baffle plate 213 and the crawler 22 to prevent pollutants from entering between the wheel 21 and the crawler 22, reduce debris from being entangled in the crawler, and thus improve the overall moving efficiency and cleaning efficiency. For example, the decorative plate can be connected to the wheel 21, or can be buckled on the baffle plate, or connected to the cleaning body, as long as the installation of the decorative plate can be achieved.

[0049] In the case where the crawler track overlapping structure 214 can cooperate with other structures to form a limiting structure, such as Figure 3 As shown, the cleaning body 1 includes a bearing shell 11. When the wheel 21 is connected to the cleaning body 1, the first engagement structure 211, the crawler overlap structure 214 and the bearing shell 11 form a limiting structure 212. The position where the wheel 21 is connected to the cleaning body 1 can be set inside the bearing shell 11 or outside the bearing shell 11.

[0050] When the wheel 21 is disposed inside the bearing shell 11 , the first engagement structure 211 , the track overlap structure 214 and the inner surface of the bearing shell 11 form a limiting structure 212 .

[0051] When the wheel 21 is disposed outside the bearing shell 11, the first meshing structure 211, the track overlap structure 214 and the outer surface of the bearing shell 11 form a limiting structure 212. The limiting structure 212 is formed by the cooperation between the track overlap structure 214 and the inner wall or the outer wall of the bearing shell 11, so that no additional structure is required on the wheel 21, thereby reducing production costs and processing difficulty.

[0052] Or, if Figure 4As shown, the cleaning body 1 may also include a protective cover plate 12, which is detachably connected to the wheel 21, and a limiting structure 212 is formed by the first meshing structure 211, the track overlap structure 214 and the protective cover plate 12. The anti-slip structure provided on the inner surface of the track 22 extends into the limiting structure 212 to limit the position of the track 22. In addition to cooperating with the track overlap structure 214 to form the limiting structure 212, the protective cover plate 12 can also protect the wheel 21 to prevent pollutants from entering between the wheel 21 and the track, thereby protecting the wheel 21 and the track 22.

[0053] The wheel 21 can be the driving wheel of the pool cleaning robot, or the driven wheel of the pool cleaning robot, or both the driving wheel and the driven wheel are wheels 21 of this structure, so as to better limit the track 22 and effectively prevent the track 22 from falling off the axial direction of the wheel 21 during use.

[0054] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0055] The above description is only an illustrative specific implementation of the embodiment of the present application, and is not intended to limit the scope of the embodiment of the present application. Any equivalent changes, modifications and combinations made by any technician in this field without departing from the concept and principle of the embodiment of the present application should fall within the scope of protection of the embodiment of the present application.

Claims

1. A swimming pool cleaning robot with a crawler overlapping structure, characterized in that: include: A cleaning body (1) for cleaning pollutants in a swimming pool; A driving mechanism (2), the driving mechanism (2) comprising: A wheel (21), the wheel (21) being rotatably arranged on the cleaning body (1), the wheel (21) comprising a track overlapping structure (214) and a first meshing structure (211), the track overlapping structure (214) and the first meshing structure (211) being arranged in sequence in the axial direction of the wheel (21) to form a limiting structure (212) on the wheel (21) or between the wheel (21) and the cleaning body (1); A crawler track (22), wherein the crawler track (22) is sleeved outside the wheel (21), and at least a portion of the crawler track (22) is engaged with the first engaging structure (211), so that the crawler track (22) moves under the drive of the wheel (21), and an anti-slip structure is provided on the inner surface of the crawler track (22), and the anti-slip structure is overlapped on the crawler track overlap structure (214).

2. The swimming pool cleaning robot with a crawler overlapping structure according to claim 1, characterized in that: The wheel (21) also includes a wheel body, the first meshing structure (211) is arranged on the outer peripheral surface of the wheel body and protrudes radially along the wheel body, the width of the first meshing structure (211) in the axial direction of the wheel (21) is smaller than the width of the wheel body in the axial direction, so as to form the track overlap structure (214); when the wheel body is rotatably connected to the cleaning body (1), the limiting structure (212) is formed by the first meshing structure (211), the track overlap structure (214) and the cleaning body (1), and the anti-slip structure arranged on the inner surface of the track (22) extends into the limiting structure (212).

3. The swimming pool cleaning robot with a crawler overlapping structure according to claim 2, characterized in that: The cleaning body (1) comprises a bearing shell (11); when the wheel (21) is connected to the cleaning body (1), the limiting structure (212) is formed by the first meshing structure (211), the crawler track overlapping structure (214) and the bearing shell (11); and the anti-slip structure provided on the inner surface of the crawler track (22) extends into the limiting structure (212).

4. The swimming pool cleaning robot with a crawler overlapping structure according to claim 2, characterized in that: The cleaning body (1) comprises a protective cover plate (12), the protective cover plate (12) being detachably connected to the wheel (21), the limiting structure (212) being formed by the first engaging structure (211), the crawler track overlapping structure (214) and the protective cover plate (12), and the anti-slip structure provided on the inner surface of the crawler track (22) extends into the limiting structure (212).

5. The swimming pool cleaning robot with a crawler overlapping structure according to claim 2, characterized in that: The wheel (21) further comprises a baffle (213), wherein the baffle (213) is arranged on the wheel body and protrudes radially from the wheel body, and the limiting structure (212) is formed by the first meshing structure (211), the crawler track overlapping structure (214) and the baffle (213), and the anti-slip structure arranged on the inner surface of the crawler track (22) extends into the limiting structure (212).

6. The swimming pool cleaning robot with a crawler overlapping structure according to claim 5, characterized in that: The swimming pool cleaning robot also includes a decorative plate, which is relatively sealed between the baffle plate (213) and the crawler track (22) to prevent contaminants from entering between the wheel (21) and the crawler track (22).

7. The swimming pool cleaning robot with a crawler overlapping structure according to any one of claims 1 to 6, characterized in that: The limiting structure (212) is a limiting groove, and the anti-slip structure provided on the inner surface of the crawler (22) is a limiting protrusion (222) that cooperates with the limiting groove.

8. The swimming pool cleaning robot with a crawler overlapping structure according to claim 7, characterized in that: The first meshing structure (211) comprises meshing grooves spaced apart along the circumference of the wheel (21); at least a portion of the track (22) that cooperates with the first meshing structure (211) is a meshing tooth (221); the meshing tooth (221) is arranged on the inner surface of the track (22) and cooperates with the meshing grooves.

9. The swimming pool cleaning robot with a crawler overlapping structure according to claim 8, characterized in that: The depth of the engagement groove in the radial direction of the wheel (21) is smaller than the depth of the limiting groove in the radial direction of the wheel (21), and the height of the engagement tooth (221) is smaller than the height of the limiting protrusion (222).

10. The swimming pool cleaning robot with a crawler overlapping structure according to claim 9, characterized in that: The meshing teeth (221) and the limiting protrusions (222) are arranged in sequence in the width direction of the crawler (22).

11. The swimming pool cleaning robot with a crawler overlapping structure according to any one of claims 1 to 6, characterized in that: The limiting structure (212) is continuous in the circumferential direction of the wheel (21).

12. The swimming pool cleaning robot with a crawler overlapping structure according to any one of claims 1 to 6, characterized in that: The outer peripheral surface of the crawler (22) is provided with anti-skid protrusions, and the anti-skid protrusions are arranged in sequence and at intervals along the circumference of the crawler (22).