Roller brush traction mechanism and cleaning equipment

Abstract

This application discloses a roller brush traction mechanism and a cleaning device, belonging to the technical field of cleaning equipment. The roller brush traction mechanism includes a base, a roller brush, and an auxiliary wheel assembly; both the roller brush and the auxiliary wheel assembly are located at the bottom of the base and are rotatably connected to the base, with the first rotation axis of the roller brush and the second rotation axis of the auxiliary wheel assembly parallel; the auxiliary wheel assembly is configured to switch between a first state and a second state. In the first state, the first frictional force between the roller brush and the supporting surface is greater than or equal to a frictional force threshold; in the second state, the second frictional force between the roller brush and the supporting surface is less than the frictional force threshold. Using this scheme, when the auxiliary wheel assembly is in the first state, it helps to improve the cleaning effect of the roller brush on the supporting surface. When the auxiliary wheel assembly is in the second state, the frictional force between the roller brush and the ground is small or even zero, which helps to reduce the difficulty for the user to drag the cleaning device backward.

Description

Technical Field

[0001] This application relates to the field of cleaning equipment technology, and in particular to a roller brush traction mechanism and terminal device. Background Technology

[0002] The use of household cleaning equipment such as floor scrubbers, mops, and vacuum cleaners is becoming increasingly widespread, and the market size is growing rapidly.

[0003] Floor scrubbers and other cleaning equipment typically include a roller brush and an electric fan. During operation, the cleaning equipment utilizes the centrifugal force generated by the rotation of the roller brush, the friction between the roller brush and the ground, and the suction generated by the fan in the cleaning equipment to perform cleaning.

[0004] To ensure the cleaning power of the cleaning equipment, the friction between the roller brush and the ground is usually relatively high. However, when the user pulls the cleaning equipment backward, the friction will offset part of the pulling force, making it difficult to pull the cleaning equipment. Summary of the Invention

[0005] This application provides a roller brush traction mechanism and a terminal device, which solves the problem in related technologies where the high friction between the roller brush and the ground makes it difficult to pull the cleaning equipment. The technical solution is as follows:

[0006] In a first aspect, this application provides a roller brush traction mechanism, which includes a base, a roller brush, and an auxiliary wheel assembly;

[0007] The roller brush and the auxiliary wheel assembly are both located at the bottom of the base and are rotatably connected to the base. The first rotation axis of the roller brush and the second rotation axis of the auxiliary wheel assembly are parallel.

[0008] The auxiliary wheel assembly is configured to switch between a first state and a second state. In the first state, a first frictional force between the roller brush and the support surface is greater than or equal to a frictional force threshold. In the second state, a second frictional force between the roller brush and the support surface is less than the frictional force threshold.

[0009] In one possible implementation, the base has a receiving groove at its bottom, the receiving groove being located on one side of the roller brush, and the auxiliary wheel assembly includes a swing arm and an auxiliary wheel;

[0010] The swing arm is located in the receiving groove, and one end is rotatably connected to the base;

[0011] The auxiliary wheel is rotatably connected to the other end of the swing arm and is at least partially located outside the receiving groove.

[0012] In one possible implementation, the swing arm is capable of sliding radially along the third rotation axis, and the end of the swing arm connected to the base has a protrusion located on the side of the first reference surface near the roller brush. The first reference surface is the plane containing the axis of the auxiliary wheel and the second rotation axis. In the second state, the protrusion abuts against the top wall of the receiving groove.

[0013] In one possible implementation, the protrusion is an arc-shaped protrusion.

[0014] In one possible implementation, the end of the swing arm connected to the base has a first connecting hole, which is an oblong hole. The length direction of the oblong hole is the same as the length direction of the swing arm, and the swing arm is pivotally connected to the base through the oblong hole.

[0015] In one possible implementation, the receiving groove has two opposing inner sidewalls with strip grooves in the extension direction of the second rotation axis, and the auxiliary wheel assembly further includes a swing arm shaft located in the first connecting hole, with both ends of the swing arm shaft located in the strip grooves.

[0016] In one possible implementation, the inner wall of the strip groove has a limiting protrusion located at the end of the strip groove away from the top wall.

[0017] In one possible implementation, the receiving groove has a first limiting surface near the inner wall of the roller brush. The first limiting surface is located at the opening of the receiving groove and is inclined. In the second state, the side wall of the swing arm is in contact with the first limiting surface.

[0018] In one possible implementation, the inner wall of the receiving groove away from the roller brush has a second limiting surface, which is located at the opening of the receiving groove and is inclined. In the first state, the side wall of the swing arm is in contact with the second limiting surface.

[0019] Secondly, this application provides a cleaning device that includes a roller brush traction mechanism as described in any one of the first aspects and its possible implementations.

[0020] The beneficial effects of the technical solutions provided in this application are:

[0021] In the solution provided in this application embodiment, the auxiliary wheel assembly can be switched to a first state and a second state. In the first state, the first frictional force generated between the roller brush and the support surface is greater than or equal to the frictional force threshold, so as to ensure a good cleaning effect on the support surface. In the second state, the second frictional force generated between the roller brush and the support surface is less than the frictional force threshold. The second frictional force is less than the first frictional force, which helps to reduce the difficulty for the user to drag the roller brush traction mechanism.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a roller brush traction mechanism provided in an embodiment of this application;

[0025] Figure 2 This is a bottom view of a brush traction mechanism provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the structure of a roller brush traction mechanism when the auxiliary wheel assembly is in the first state, according to an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the structure of a roller brush traction mechanism when the auxiliary wheel assembly is in the second state, according to an embodiment of this application.

[0028] Figure 5 This is a partial structural schematic diagram of a roller brush traction mechanism provided in an embodiment of this application;

[0029] Figure 6 This is a schematic diagram of the structure of an auxiliary wheel assembly provided in an embodiment of this application;

[0030] Figure 7 This is a side view of a swing arm provided in an embodiment of this application;

[0031] Figure 8 This is a partial structural schematic diagram of a roller brush traction mechanism in a first state, provided in an embodiment of this application;

[0032] Figure 9 This is a partial structural schematic diagram of a roller brush traction mechanism in a second state, provided in an embodiment of this application;

[0033] Figure 10 This is a partial structural schematic diagram of a roller brush traction mechanism provided in an embodiment of this application;

[0034] Figure 11 This is a partial structural schematic diagram of a roller brush traction mechanism provided in an embodiment of this application.

[0035] Legend

[0036] 1. Base; 2. Roller brush; 3. Auxiliary wheel assembly; 4. Support wheel;

[0037] 11. Receiving groove; 31. Swing arm; 32. Auxiliary wheel;

[0038] 11A, Top wall; 11B, Strip groove; 11C, Limiting protrusion; 11D, First limiting surface; 11E, Second limiting surface; 311, Swing arm body; 312, Swing arm pivot; 31A, Protrusion; 31B, First connecting hole;

[0039] 3111, First connecting part; 3112, Second connecting part; 3113, Third connecting part;

[0040] L, first axis of rotation; N, second axis of rotation; M, third axis of rotation. Detailed Implementation

[0041] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0043] With technological advancements, smart home appliances are becoming increasingly prevalent. For example, cleaning equipment such as floor scrubbers, mops, and vacuum cleaners are being used more widely, leading to rapid market growth. Floor scrubbers, for instance, typically consist of a roller brush and a fan. During operation, they utilize the centrifugal force generated by the rotating roller brush, the friction between the brush and the floor, and the suction from the fan to clean the surface.

[0044] To ensure the cleaning ability of cleaning equipment, the friction between the roller brush and the ground is usually relatively high. However, when the user pulls the cleaning equipment backward, the friction offsets part of the pulling force, making it difficult to pull the equipment. Therefore, this application provides a roller brush traction mechanism that maintains a large friction between the roller brush and the ground when the cleaning equipment is moving forward, and reduces the friction between the roller brush and the ground when the cleaning equipment is pulled backward. The roller brush traction mechanism provided in this application is described below.

[0045] Figure 1 This is a schematic diagram of the structure of a roller brush traction mechanism provided in an embodiment of this application. Figure 2 This is a bottom view of a brush traction mechanism provided in an embodiment of this application. Figure 1 and Figure 2 As shown, the roller brush traction mechanism includes a base 1, a roller brush 2, and an auxiliary wheel assembly 3. Both the roller brush 2 and the auxiliary wheel assembly 3 are located at the bottom of the base 1, and are rotatably connected to the base 1. The auxiliary wheel assembly 3 is located on one side of the roller brush 2, and the first rotation axis L of the roller brush 2 and the second rotation axis N of the auxiliary wheel assembly 3 are parallel to each other.

[0046] Figure 3 This is a schematic diagram of the structure of a brush traction mechanism when the auxiliary wheel assembly is in the first state, according to an embodiment of this application. Figure 4 This is a schematic diagram of the structure of a brush traction mechanism when the auxiliary wheel assembly is in the second state, as provided in an embodiment of this application. (Combined with...) Figures 1 to 3 As shown, the auxiliary wheel assembly 3 is configured to switch between a first state and a second state. When the auxiliary wheel assembly 3 is in the first state, the pressure between the auxiliary wheel assembly 3 and the support surface is small or even non-existent, and the first frictional force generated between the roller brush 2 and the support surface is greater than or equal to the frictional force threshold, ensuring that the roller brush 2 can effectively clean the support surface. When the auxiliary wheel assembly 3 is in the second state, the pressure between the auxiliary wheel assembly 3 and the support surface is larger; in other words, the auxiliary wheel assembly 3 plays a major supporting role in the entire roller brush traction mechanism. At this time, the second frictional force generated between the roller brush 2 and the support surface is less than the frictional force threshold, which helps reduce the difficulty for the user to drag the cleaning device backward.

[0047] As an example, the aforementioned support surface is the ground. When the cleaning equipment using this roller brush traction mechanism is in operation, the roller brush 2 typically moves along... Figure 3 The image shows a counter-clockwise rotation. The cleaning equipment moves forward (towards)... Figure 3 During the movement to the left (as shown in the diagram), the auxiliary wheel assembly 3 is in its first state, with little or no pressure between it and the ground. The roller brush 2, in contact with the ground, provides primary support for the entire roller brush traction mechanism. At this time, the first frictional force generated between the roller brush 2 and the ground is greater than or equal to the frictional force threshold. Specifically, the contact area between the roller brush 2 and the ground is at its maximum, resulting in significant friction between them. This ensures that the roller brush 2 (i.e., the cleaning device) has a good cleaning effect on the ground. Furthermore, the frictional force can provide traction during the forward movement of the cleaning device, saving the user's energy. When the user moves backward (towards...) Figure 3 When the cleaning device is dragged (as shown on the right), the auxiliary wheel assembly 3 switches from the first state to the second state. The auxiliary wheel assembly 3 plays a major supporting role for the entire roller brush traction mechanism. At this time, the second friction force generated between the roller brush 2 and the ground is less than the friction force threshold. Specifically, the contact area between the roller brush 2 and the ground is reduced, which reduces or even eliminates the friction force between the roller brush 2 and the ground. The interference caused by the friction force between the roller brush 2 and the ground is weakened or even eliminated, thereby reducing the difficulty for the user to drag the cleaning device backward.

[0048] Figure 5 This is a partial structural schematic diagram of a brush traction mechanism provided in an embodiment of this application. Figure 6 This is a schematic diagram of an auxiliary wheel assembly provided in an embodiment of this application. Figure 5 and Figure 6 As shown, the bottom of the base 1 of the roller brush traction mechanism has a receiving groove 11, which is located on one side of the roller brush 2, and the opening of the receiving groove 11 faces towards Figure 5 As shown below. The auxiliary wheel assembly 3 includes a swing arm 31 and an auxiliary wheel 32. The swing arm 31 is located in the receiving groove 11, and one end of the swing arm 31 is rotatably connected to the base 1. The auxiliary wheel 32 is rotatably connected to the other end of the swing arm 31, and at least a portion of the auxiliary wheel 32 is located outside the receiving groove 11.

[0049] Figure 7 This is a side view of a swing arm provided in an embodiment of this application. In some examples, the swing arm 31 is capable of sliding radially along the second rotation axis N. The end of the swing arm 31 connected to the base 1 has a protrusion 31A, which is located on the side of the first reference surface near the roller brush 2. That is, the protrusion 31A is located on... Figure 7 The left side of the first reference plane is shown in the figure. The first reference plane is the plane containing the axis of the auxiliary wheel 32 and the second rotation axis N.

[0050] Figure 8 This is a partial structural diagram of a roller brush traction mechanism in a first state, provided in an embodiment of this application. Figure 9 This is a partial structural schematic diagram of a roller brush traction mechanism in a second state, provided in an embodiment of this application. (Combined with...) Figure 3 and Figure 8 As shown, when the auxiliary wheel assembly 3 is in the first state, the portion of the top of the swing arm 31 located on the side away from the roller brush 2 from the first reference surface is in contact with the top wall 11A of the receiving groove 11. At this time, the auxiliary wheel 32 of the auxiliary wheel assembly 3 is just in contact with or even not in contact with the support surface, while the roller brush 2 is in contact with the support surface, and the roller brush 2 plays a major supporting role in the entire roller brush traction mechanism. Figure 4 and Figure 9 As shown, when the auxiliary wheel assembly 3 is in the second state, the roller brush 2 is just in contact with the support surface or not in contact at all, while the auxiliary wheel 32 of the auxiliary wheel assembly 3 is in contact with the support surface, and the auxiliary wheel 32 plays the main supporting role for the entire roller brush traction mechanism.

[0051] When the auxiliary wheel assembly 3 switches from the first state to the second state, the swing arm 31 moves along... Figure 8 As shown in the diagram, rotating clockwise, the top wall 11A of the receiving groove 11 is composed of... Figure 7 The uniform arc portion on the right side of the first reference surface shown in the figure gradually comes into contact with the protrusion 31A of the swing arm 31, and finally the top of the protrusion 31A abuts against the top wall 11A of the receiving groove 11, that is, it reaches... Figure 9 The state shown is as follows. During this process, the swing arm 31 is displaced radially along the second rotation axis N, or in other words, the base 1 is displaced radially along the second rotation axis N and in a direction away from the auxiliary wheel 32, thereby causing the roller brush 2 to be displaced radially along the second rotation axis N and in a direction away from the auxiliary wheel 32, thereby reducing the contact area between the roller brush 2 and the support surface and reducing the friction between the roller brush 2 and the support surface.

[0052] As an example, such as Figure 7 As shown, protrusion 31A is an arc-shaped protrusion. Specifically, the top of the swing arm 31 is a circular arc structure of equal radius (i.e., a semi-circular arc structure). An arc-shaped protrusion is provided at a certain position on the left side of the first reference surface. The two sides of the arc-shaped protrusion smoothly transition with the semi-circular arc structure at the top of the swing arm 31, and the top of the arc-shaped protrusion is the highest point of the swing arm 31. With this design, when protrusion 31A abuts against the top wall 11A of the receiving groove 11, the auxiliary wheel assembly 3 plays a major supporting role for the entire roller brush traction mechanism, reducing the contact area between the roller brush 2 and the supporting surface, thereby reducing the friction between the roller brush 2 and the supporting surface. Moreover, since protrusion 31A is an arc-shaped protrusion, the auxiliary wheel assembly 3 switches more smoothly and steadily between the first and second states.

[0053] Alternatively, the protrusion 31A can also be a triangular structure, an elliptical structure, etc. There are no restrictions on the shape and structure of the protrusion 31A here.

[0054] In order to enable the swing arm 31 to slide radially along the second rotation axis N, as an example, the embodiments of this application provide the following possible structures:

[0055] Structure 1: The swing arm 31 has a waist-shaped hole.

[0056] like Figure 6 As shown, the end of the swing arm 31 connected to the base 1 has a first connecting hole 31B. The first connecting hole 31B is an oblong hole, and the length direction of the oblong hole is the same as the length direction of the swing arm. The swing arm 31 is pivotally connected to the base 1 through the oblong hole.

[0057] As an example, such as Figure 6 As shown, the swing arm 31 includes a swing arm body 311 and a swing arm pivot 312. A first connecting hole 31B is located at the end of the swing arm body 311 connected to the base 1. The swing arm pivot 312 is located in the first connecting hole 31B, and both ends of the swing arm pivot 312 are rotatably connected to the inner wall of the receiving groove 11. Specifically, the receiving groove 11 has mounting holes on two opposing inner walls in the extension direction of the second rotation axis N, and both ends of the swing arm pivot 312 are located in the mounting holes of the two inner walls. When the auxiliary wheel assembly 3 switches between the first and second states, the swing arm pivot 312 slides along the length direction of the waist-shaped hole.

[0058] Optionally, the receiving groove 11 has two opposing inner sidewalls with cylindrical mounting portions in the extension direction of the second rotation axis N. The cylindrical mounting portions are fixedly connected to the inner sidewalls of the receiving groove 11 by integral molding or welding. Part of the cylindrical mounting portion is located in the oblong hole (i.e., the first connecting hole 31B). When the auxiliary wheel assembly 3 switches between the first state and the second state, the cylindrical mounting portion slides along the length direction of the oblong hole, or in other words, the swing arm body 311 slides relative to the cylindrical mounting portion along the length direction of the oblong hole.

[0059] In some examples, such as Figure 6As shown, the swing arm body 311 includes a first connecting portion 3111, a second connecting portion 3112, and a third connecting portion 3113. A first connecting hole 31B is located in the first connecting portion 3111. The second connecting portion 3112 and the third connecting portion 3113 are both located on the side of the first connecting portion 3111 away from the top wall 11A of the receiving groove 11, and are respectively connected to the first connecting portion 3111. Furthermore, the second connecting portion 3112 and the third connecting portion 3113 have a distance between them in the extending direction of the second rotation axis N. An auxiliary wheel 32 is located between the second connecting portion 3112 and the third connecting portion 3113, and the auxiliary wheel 32 is rotatably connected to both the second connecting portion 3112 and the third connecting portion 3113. No limitations are made here regarding the shape and structure of the swing arm body 311, the shape and structure of the auxiliary wheel 32, or the connection method between the swing arm body 311 and the auxiliary wheel 32.

[0060] Structure 2, the receiving groove 11 has a strip groove 11B

[0061] Figure 10 This is a partial structural schematic diagram of a roller brush traction mechanism provided in an embodiment of this application. As an example, combined with... Figure 6 and Figure 10 As shown, the receiving groove 11 has two opposing inner sidewalls with strip grooves 11B in the extension direction of the second rotation axis N. The swing arm 31 includes a swing arm body 311 and a swing arm shaft 312. The end of the swing arm body 311 connected to the base 1 has a first connecting hole 31B, which is a cylindrical through hole. The swing arm shaft 312 is located in the first connecting hole 31B, and the first connecting hole 31B and the swing arm shaft 312 can be fixedly connected by means of hard fitting, integral molding, or welding. The two ends of the swing arm shaft 312 are located in the strip grooves 11B respectively. When the auxiliary wheel assembly 3 switches between the first state and the second state, the swing arm shaft 312 slides up and down in the strip grooves 11B, that is, the auxiliary wheel assembly 3 slides up and down relative to the base 1.

[0062] Optionally, the swing arm 31 includes only the swing arm body 311, and the swing arm body 311 does not have the first connecting hole 31B. In this case, the two opposite sidewalls of the swing arm body 311 in the extension direction of the second rotation axis N have cylindrical protrusions, which are located in the strip groove 11B to realize the up and down sliding of the auxiliary wheel assembly 3 relative to the base 1.

[0063] Structure 3: The swing arm 31 has an oblong hole and the receiving groove 11 has a strip groove 11B.

[0064] As an example, combined Figure 6 , Figure 9 and Figure 10As shown, the swing arm 31 includes a swing arm body 311 and a swing arm pivot 312. A first connecting hole 31B is located at the end of the swing arm body 311 that is connected to the base 1. The swing arm pivot 312 is located in the first connecting hole 31B, and both ends of the swing arm pivot 312 are rotatably connected to the inner sidewall of the receiving groove 11. The receiving groove 11 has two opposing inner sidewalls with strip grooves 11B in the extension direction of the second rotation axis N, and both ends of the swing arm pivot 312 are located in the strip grooves 11B.

[0065] As an example, the bottom of the slot 11B may have an opening, and the inner wall of the slot 11B has a limiting protrusion 11C, which is located at the end of the slot 11B away from the top wall 11A. The limiting protrusion 11C can limit the swing arm pivot 312 and prevent it from slipping out of the bottom opening of the slot 11B.

[0066] With this scheme, when the auxiliary wheel assembly 3 switches between the first state and the second state, the swing arm shaft 312 can slide up and down in both the first connecting hole 31B and the strip groove 11B, which improves the flexibility of the auxiliary wheel assembly 3 and ensures that the auxiliary wheel 32 is always in contact with the support surface, which is beneficial to improving the stability during the state switching process.

[0067] Optionally, the radial sliding of the swing arm 31 along the second rotation axis N can also be achieved by a micro motor. For example, a slide rail can be provided radially along the second rotation axis N, and a micro motor can be provided on the base 1. The swing arm 31 is slidably connected to the slide rail, and the micro motor is used to control the swing arm 31 to slide on the slide rail. When the auxiliary wheel assembly 3 switches between the first state and the second state, the micro motor controls the swing arm 31 to slide on the slide rail, thereby ensuring that the protrusion 31A abuts against the top wall 11A of the receiving groove 11. No limitations are imposed here on the scheme for achieving the radial sliding of the swing arm 31 along the second rotation axis N.

[0068] Figure 11 This is a partial structural schematic diagram of a brush traction mechanism provided in an embodiment of this application. In some examples, combined with... Figure 5 , Figure 9 and Figure 11 As shown, the inner wall of the receiving groove 11 near the roller brush 2 has a first limiting surface 11D. The first limiting surface 11D is located at the opening of the receiving groove 11, and the first limiting surface 11D is an inclined surface. Specifically, the side of the first limiting surface 11D away from the top wall 11A is inclined towards the roller brush 2. When the auxiliary wheel assembly 3 is in the second state, the protrusion 31A abuts against the top wall 11A, and the side wall of the swing arm 31 is in contact with the first limiting surface 11D. This design helps to prevent the protrusion 31A from failing to abut against the top wall 11A due to excessive rotation angle of the swing arm 31.

[0069] Optionally, the inner wall of the receiving groove 11 near the roller brush 2 may not have a first limiting surface 11D, while the side wall of the swing arm 31 near the roller brush 2 has a limiting part. When the auxiliary wheel assembly 3 is in the second state, the protrusion 31A abuts against the top wall 11A, and the limiting part abuts against the inner wall of the receiving groove 11 near the roller brush 2, thereby achieving the limiting effect on the swing arm 31.

[0070] In other examples, combined Figure 5 , Figure 8 and Figure 11 As shown, the inner wall of the receiving groove 11 away from the roller brush 2 has a second limiting surface 11E. The second limiting surface 11E is located at the opening of the receiving groove 11, and the second limiting surface 11E is an inclined surface. Specifically, the side of the second limiting surface 11E away from the top wall 11A is inclined in the direction away from the roller brush 2. When the auxiliary wheel assembly 3 is in the first state, the side wall of the swing arm 31 is in contact with the second limiting surface 11E. With this scheme, when the cleaning equipment moves in the first state with the auxiliary wheel assembly 3, the side wall of the swing arm 31 is in contact with the second limiting surface 11E, preventing the swing arm 31 from hitting the base 1 due to movement. This not only eliminates the noise generated by the collision between components, but also helps to improve the service life of the swing arm 31.

[0071] Optionally, the inner wall of the receiving groove 11 away from the roller brush 2 may not have a second limiting surface 11E, while the side wall of the swing arm 31 away from the roller brush 2 has a limiting part. When the auxiliary wheel assembly 3 is in the first state, the limiting part is in contact with the inner wall of the receiving groove 11 away from the roller brush 2, thereby achieving the limiting effect on the swing arm 31.

[0072] In some examples, reference Figure 2 As shown, the roller brush traction mechanism may include two auxiliary wheel assemblies 3, the rotation axes of the two auxiliary wheel assemblies 3 are collinear, and the two auxiliary wheel assemblies 3 are respectively opposite to the two ends of the roller brush 2. This design, when the auxiliary wheel assemblies 3 are in the second state, helps to improve the stability of the entire roller brush traction mechanism.

[0073] Optionally, the roller brush traction mechanism may include one auxiliary wheel assembly 3 or more auxiliary wheel assemblies 3. The number of auxiliary wheel assemblies 3 is not limited here.

[0074] In the solution provided in this application embodiment, the auxiliary wheel assembly can be switched between a first state and a second state. In the first state, the first frictional force generated between the roller brush and the support surface is greater than or equal to a frictional force threshold. In the second state, the second frictional force generated between the roller brush and the support surface is less than the frictional force threshold. When the cleaning equipment using this roller brush traction mechanism is working, the roller brush 2 typically moves along... Figure 3The device rotates counterclockwise as shown. During the forward movement of the cleaning device, the auxiliary wheel assembly 3 is in its first state, with minimal or no pressure between it and the support surface. The roller brush 2 contacts the support surface, providing primary support for the entire roller brush traction mechanism. At this time, the contact area between the roller brush 2 and the support surface is at its maximum, resulting in significant friction between them. This ensures a good cleaning effect of the roller brush 2 (i.e., the cleaning device) on the support surface. Furthermore, the friction provides traction during the forward movement of the cleaning device, saving the user's energy. When the user moves backward (towards...) Figure 3 When the cleaning device is dragged (as shown on the right side), the auxiliary wheel assembly 3 switches from the first state to the second state. The auxiliary wheel assembly 3 plays a major supporting role for the entire roller brush traction mechanism. At this time, the contact area between the roller brush 2 and the support surface is reduced, which reduces or even eliminates the friction between the roller brush 2 and the support surface. The interference caused by the friction between the roller brush 2 and the support surface is weakened or even eliminated, thereby reducing the difficulty for the user to drag the cleaning device backward.

[0075] In some examples, reference Figure 1 and Figure 2 As shown, the roller brush traction mechanism also includes a support wheel 4. The support wheel 4 is also located at the bottom of the base 1, on the side of the auxiliary wheel assembly 3 away from the roller brush 2, and is rotatably connected to the base 1. The third rotation axis M of the support wheel 4 is parallel to the first rotation axis L of the roller brush 2 and the second rotation axis N of the auxiliary wheel assembly 3, respectively. When the auxiliary wheel assembly 3 is in the first state, the roller brush 2 and the support wheel 4 are in contact with the support surface and provide the main support for the entire roller brush traction mechanism. At this time, the first frictional force between the roller brush 2 and the support surface is greater than or equal to the frictional force threshold, thus achieving a cleaning effect on the support surface. When the auxiliary wheel assembly 3 is in the second state, the auxiliary wheel assembly 3 and the support wheel 4 are in contact with the support surface and provide the main support for the entire roller brush traction mechanism. At this time, the second frictional force between the roller brush 2 and the support surface is less than the frictional force threshold, thereby reducing the influence of friction when dragging the roller brush traction mechanism and reducing the difficulty of dragging the roller brush traction mechanism.

[0076] As an example, the support surface is the ground, and when the cleaning equipment using this roller brush traction mechanism is working, the roller brush 2 typically moves along... Figure 3 The image shows a counter-clockwise rotation. The cleaning equipment moves forward (towards)... Figure 3During the movement to the left (as shown in the diagram), the auxiliary wheel assembly 3 is in the first state, and the roller brush 2 and support wheel 4 are in contact with the ground. At this time, the first frictional force generated between the roller brush 2 and the ground is greater than or equal to the frictional force threshold. Specifically, the contact area between the roller brush 2 and the ground is at its maximum, resulting in a large frictional force between the roller brush 2 and the ground. This ensures that the roller brush 2 (i.e., the cleaning device) has a good cleaning effect on the ground. Moreover, the frictional force can act as a traction force during the forward movement of the cleaning device, which helps to save the user's physical strength. When the user moves backward (towards...) Figure 3 When the cleaning device is dragged (as shown on the right), the auxiliary wheel assembly 3 switches from the first state to the second state. The auxiliary wheel assembly 3 and the support wheel 4 come into contact with the ground, and the roller brush 2 is lifted. At this time, the second friction force generated between the roller brush 2 and the ground is less than the friction force threshold. Specifically, the contact area between the roller brush 2 and the ground is reduced or even zero, so that the friction force between the roller brush 2 and the ground is reduced or even zero. The interference caused by the friction force is weakened or even eliminated, thereby reducing the difficulty for the user to drag the cleaning device backward.

[0077] In some examples, the distance from the second rotation axis N to the third rotation axis M is greater than or equal to the distance between the second rotation axis N and the first rotation axis L, or in other words, the distance from the second rotation axis N to the rim of the support wheel 4 is greater than or equal to the distance from the second rotation axis N to the edge of the roller brush 2. Using this scheme, the auxiliary wheel assembly 3 can switch between the first and second states with less effort.

[0078] Optionally, the distance from the second rotation axis N to the third rotation axis M can also be less than the distance from the second rotation axis N to the first rotation axis L. In this case, when the auxiliary wheel assembly 3 switches from the first state to the second state, the distance between the first rotation axis L and the support surface will be higher, and the contact area between the roller brush 2 and the support surface will be smaller, which is beneficial to further reduce the friction between the roller brush 2 and the support surface.

[0079] Based on the same technical concept, this application also provides a cleaning device, which includes any of the roller brush traction mechanisms provided in this application. The cleaning device provided in this application includes, but is not limited to, household floor scrubbers, mops, and vacuum cleaners. Using this solution, when the user pushes the cleaning device, the auxiliary wheel assembly 3 is in a first state, where the pressure between the auxiliary wheel assembly 3 and the support surface is small or even nonexistent. The first frictional force generated between the roller brush 2 and the support surface is greater than or equal to the frictional force threshold, ensuring that the roller brush 2 can effectively clean the support surface. When the auxiliary wheel assembly 3 is in a second state, the pressure between the auxiliary wheel assembly 3 and the support surface is larger; in other words, the auxiliary wheel assembly 3 plays a major supporting role in the entire roller brush traction mechanism. At this time, the second frictional force generated between the roller brush 2 and the support surface is less than the frictional force threshold, which helps reduce the difficulty for the user to drag the cleaning device backward.

[0080] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A roller brush traction mechanism, characterized in that, The roller brush traction mechanism includes a base (1), a roller brush (2), and an auxiliary wheel assembly (3); The roller brush (2) and the auxiliary wheel assembly (3) are both located at the bottom of the base (1) and are rotatably connected to the base (1) respectively. The first rotation axis (L) of the roller brush (2) and the second rotation axis (N) of the auxiliary wheel assembly (3) are parallel. The auxiliary wheel assembly (3) is configured to switch to a first state and a second state. In the first state, the first frictional force between the roller brush (2) and the support surface is greater than or equal to a frictional force threshold. In the second state, the second frictional force between the roller brush (2) and the support surface is less than the frictional force threshold. The base (1) has a receiving groove (11) at its bottom, the receiving groove (11) being located on one side of the roller brush (2), and the auxiliary wheel assembly (3) includes a swing arm (31) and an auxiliary wheel (32); The swing arm (31) is located in the receiving groove (11), and one end is rotatably connected to the base (1); The auxiliary wheel (32) is rotatably connected to the other end of the swing arm (31) and is at least partially located outside the receiving groove (11); The swing arm (31) is capable of sliding radially along the second rotation axis (N). The end of the swing arm (31) connected to the base (1) has a protrusion (31A). The protrusion (31A) is located on the side of the first reference surface close to the roller brush (2). The first reference surface is the plane where the axis of the auxiliary wheel (32) and the second rotation axis (N) are located. In the second state, the protrusion (31A) abuts against the top wall (11A) of the receiving groove (11). In the first state, the portion of the top of the swing arm (31) located on the side of the first reference surface away from the roller brush (2) is in contact with the top wall (11A) of the receiving groove (11).

2. The roller brush traction mechanism according to claim 1, characterized in that, The protrusion (31A) is an arc-shaped protrusion.

3. The roller brush traction mechanism according to claim 1, characterized in that, The swing arm (31) has a first connecting hole (31B) at one end connected to the base (1). The first connecting hole (31B) is an oblong hole. The length direction of the oblong hole is the same as the length direction of the swing arm. The swing arm (31) is pivotally connected to the base (1) through the oblong hole.

4. The roller brush traction mechanism according to claim 3, characterized in that, The receiving groove (11) has two opposing inner sidewalls with strip grooves (11B) in the extension direction of the second rotation axis (N). The auxiliary wheel assembly (3) also includes a swing arm shaft (312), which is located in the first connecting hole (31B) and both ends of the swing arm shaft (312) are located in the strip grooves (11B).

5. The roller brush traction mechanism according to claim 4, characterized in that, The inner wall of the strip groove (11B) has a limiting protrusion (11C), which is located at the end of the strip groove (11B) away from the top wall (11A).

6. The roller brush traction mechanism according to any one of claims 1-5, characterized in that, The receiving groove (11) has a first limiting surface (11D) near the inner wall of the roller brush (2). The first limiting surface (11D) is located at the opening of the receiving groove (11) and is inclined. In the second state, the side wall of the swing arm (31) is in contact with the first limiting surface (11D).

7. The roller brush traction mechanism according to any one of claims 1-5, characterized in that, The inner sidewall of the receiving groove (11) away from the roller brush (2) has a second limiting surface (11E). The second limiting surface (11E) is located at the opening of the receiving groove (11) and is inclined. In the first state, the sidewall of the swing arm (31) is in contact with the second limiting surface (11E).

8. A cleaning device, characterized in that, The cleaning equipment includes a roller brush traction mechanism as described in any one of claims 1-7.

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