Rolling brush with variable outer diameter and cleaning equipment

Abstract

The utility model provides a rolling brush with variable outer diameter and cleaning equipment, and relates to the technical field of cleaning equipment, the rolling brush is provided with a first end far away from a driving piece and a second end close to the driving piece, and the rolling brush comprises a rolling brush outer shaft assembly, a rolling brush inner shaft assembly and a rotary telescopic assembly; the rolling brush outer shaft assembly is provided with an inner cavity arranged in the axial direction, and the outer diameter of the first end of the rolling brush outer shaft assembly is smaller than that of the second end. The rolling brush inner shaft assembly is fixedly connected with the rotary telescopic assembly, at least part of the rolling brush inner shaft assembly is movably assembled in the inner cavity, and the rolling brush outer shaft assembly can be driven to rotate synchronously. The rotary telescopic assembly is used for driving the rolling brush inner shaft assembly to translate towards the first end or the second end when receiving torque so as to extrude or be away from the inner wall of the first end of the inner cavity, so that the first end of the rolling brush outer shaft assembly expands or contracts in the radial direction, and the rolling brush inner shaft assembly is driven to rotate after the first end reaches a limited position. Therefore, the hair collecting device has the advantages that hair can be easily guided to the end away from the motor to be collected, and the hair is not easily wound on the rolling brush.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning equipment, in particular to a roller brush with a variable outer diameter and a cleaning equipment. Background Art

[0002] With the development of technology, cleaning robots are becoming more and more popular in households. Generally, a cleaning robot includes a cleaning robot body, a dust box or dust cup installed in the cleaning robot body, an air pump that provides negative pressure, a roller brush that rotates in the cleaning robot body, and a motor that drives the roller brush to rotate. Dust or hair is collected into the dust box or dust cup under the action of the air pump and the roller brush.

[0003] In the prior art, the outer diameter of the roller brush is fixed and the same. Thus, during long-term use, hair is easily entangled on the roller brush, which increases the motor load and reduces the cleaning effect. When the hair is entangled on the output end of the motor, the motor is easily burned.

[0004] Therefore, a roller brush and cleaning device with a variable outer diameter, in which hair is easily guided to be collected away from the motor end and is not easily entangled on the roller brush, need to be designed. Utility Model Content

[0005] The purpose of the utility model is to provide a roller brush and cleaning device with a variable outer diameter in view of the defects and shortcomings of the prior art, so as to solve at least one of the above-mentioned technical problems. The utility model has the advantages that hair can be easily guided to a place away from the motor end for collection and is not easily entangled on the roller brush.

[0006] To achieve the above-mentioned purpose, the utility model provides, on one hand, a roller brush with a variable outer diameter, having a first end away from a driving member and a second end close to the driving member, comprising: a roller brush outer shaft assembly, a roller brush inner shaft assembly, and a rotating telescopic assembly; the roller brush outer shaft assembly has an inner cavity arranged along the axial direction, and the outer diameter of the first end thereof is smaller than the outer diameter of the second end; the roller brush inner shaft assembly and the rotating telescopic assembly are fixedly connected, and at least partially movably assembled in the inner cavity, and can drive the roller brush outer shaft assembly to rotate synchronously; wherein,

[0007] The rotating and telescopic assembly is used to drive the roller brush inner shaft assembly to translate toward the first end when receiving a positive torque, so as to squeeze the inner wall of the first end of the inner cavity, and the first end of the roller brush outer shaft assembly radially expands, and after reaching the first extreme position, drives the roller brush inner shaft assembly to rotate forward; and when receiving a reverse torque, drives the roller brush inner shaft assembly to translate toward the second end, so as to make the first end of the roller brush outer shaft assembly radially contract, and after reaching the second extreme position, drives the roller brush inner shaft assembly to reverse.

[0008] Optionally, the rotating telescopic assembly includes: a first telescopic threaded member and a second telescopic threaded member; one of the first telescopic threaded member and the second telescopic threaded member has an internal thread, the other of the first telescopic threaded member and the second telescopic threaded member has an external thread, and the end of the internal thread has a blocking structure for blocking the movement of the external thread; the first telescopic threaded member is transmission-connected to a driving member; the second telescopic threaded member is threadedly connected to the first telescopic threaded member and is fixedly connected to the inner shaft assembly of the roller brush.

[0009] Optionally, the blocking structure includes a blocking wall located at the end of the internal thread of the second telescopic thread member, and an annular telescopic cover covering the second end of the second telescopic thread member.

[0010] Optionally, the inner cavity includes a first section close to the first end and a second section away from the first end, and the inner diameter of the first section is smaller than the inner diameter of the second section; the roller brush inner shaft assembly includes a roller brush inner shaft, and the first end of the roller brush inner shaft at least includes a first extrusion section in the shape of a cone or a truncated cone, and a second extrusion section in the shape of a cylinder connected to the first extrusion section; so that when the first extrusion section and the second extrusion section of the roller brush inner shaft squeeze the first section of the inner cavity, the first end of the roller brush outer shaft assembly expands radially.

[0011] Optionally, the roller brush outer shaft assembly includes a roller brush outer shaft body; the roller brush outer shaft body includes a hard rubber support portion and an expansion connection portion, and a plurality of the hard rubber support portions are distributed at intervals along the circumferential direction, and the expansion connection portion connects two adjacent hard rubber support portions; the inner wall of the hard rubber support portion has a convex strip extending toward the axial direction, and a plurality of the convex strips at one end close to the axial center form a first section of the inner cavity.

[0012] Optionally, the expansion connection portion is a soft rubber connection portion; when the first end of the roller brush outer shaft body radially contracts, the soft rubber connection portion is wrinkled; when the first end of the roller brush outer shaft body radially expands, the soft rubber connection portion is stretched.

[0013] Optionally, the roller brush outer shaft assembly also includes a roller brush end cover covering the first end of the brush outer shaft body, and the roller brush end cover has a plurality of hard rubber end cover parts and a soft rubber expansion part connected between adjacent hard rubber end cover parts.

[0014] Optionally, the outer circumference of the roller brush outer shaft body is spirally equipped with roller brush bristles and roller brush scraping strips.

[0015] Optionally, the roller brush inner shaft also includes a driving sleeve configured on its outer circumference and having a sliding groove that slides with the convex strip and is used to drive the roller brush outer shaft assembly to rotate coaxially; the convex strip has a step surface, and the roller brush inner shaft assembly also includes a gasket and a compression spring that are sequentially sleeved on the outer circumference of the roller brush inner shaft and located between the step surface and the driving sleeve; the second telescopic threaded member has a spline groove, and the second end of the roller brush inner shaft is fixedly connected to the second telescopic threaded member via a spline.

[0016] On the other hand, the utility model provides a cleaning device, including a cleaning device body, a driving member assembled in the cleaning device body, and a roller brush with a variable outer diameter as described above, which is transmission-connected to the driving member, and the roller brush with a variable outer diameter is assembled in the cleaning device body at one end close to the driving member through a roller brush shaft bracket.

[0017] Compared with the prior art, the advantages of this application are:

[0018] Because the roller brush outer shaft assembly of the roller brush with variable outer diameter can expand radially or contract radially at the first end of the roller brush outer shaft assembly under the action of the rotating telescopic assembly and the roller brush inner shaft assembly, the roller brush with variable outer diameter can have a first working state in which the shaft diameters of the first and second ends of the roller brush outer shaft assembly are equal, and a second working state in which the shaft diameter of the first end of the roller brush outer shaft assembly is smaller than the shaft diameter of the second end; and in the second working state, because the roller brush outer shaft assembly has a large opening between the first end and the ground, the air pump can easily generate a large negative pressure here, which can accelerate the guidance of hair to be collected away from the first end of the motor end, and finally collect the hair into the dust box under the action of negative pressure suction to avoid hair entanglement; therefore, it has the advantages that the hair can be easily guided to be collected away from the motor end and is not easy to be entangled on the roller brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

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

[0022] Figure 3 This is a schematic diagram of the exploded structure of the rotating and telescopic assembly of the embodiment of the utility model;

[0023] Figure 4 for Figure 3 Schematic diagram of the cross-section structure along line AA;

[0024] Figure 5 A schematic diagram of the structure of the roller brush outer shaft assembly of the embodiment of the utility model;

[0025] Figure 6 It is a left side view of an embodiment of the utility model;

[0026] Figure 7 for Figure 6 Schematic diagram of the cross-section structure along line BB;

[0027] Figure 8 This is a left side view of the outer shaft assembly of the roller brush according to the embodiment of the utility model;

[0028] Fig. 9 for Figure 8 Schematic diagram of the cross-sectional structure along the CC line;

[0029] Fig.10 This is a schematic diagram of the structure of the inner shaft of the roller brush according to an embodiment of the utility model;

[0030] Fig.11 It is a schematic cross-sectional structure diagram of the first end when the embodiment of the utility model is in the first working state;

[0031] Fig.12 It is a schematic diagram of the cross-sectional structure of the first end when the embodiment of the utility model is in the second working state;

[0032] Fig.13 This is a front view structural diagram of the roller brush end cover of the embodiment of the utility model;

[0033] Fig.14 This is a schematic diagram of the structure of the roller brush shaft bracket of the utility model embodiment;

[0034] Fig.15 It is a structural schematic diagram of the disassembled parts of the outer shaft of the roller brush according to an embodiment of the utility model.

[0035] Description of Reference Numerals

[0036] 100-Roller brush with variable outer diameter;

[0037] 1-roller brush outer shaft assembly; a-inner cavity; b-first section; c-introduction section; d-second section; 11-roller brush outer shaft body; 12-hard rubber support part; 121-convex strip; f-step surface; 13-expansion connection part; 14-roller brush end cover; 141-hard rubber end cover part; 142-soft rubber expansion part; 15-roller brush hair strip; 16-roller brush scraping strip;

[0038] 2-roller brush inner shaft assembly; 21-roller brush inner shaft; o-front section; g-first extrusion section; h-second extrusion section; 211-driving sleeve; i-slideway; 22-gasket; 23-compression spring;

[0039] 3-rotating telescopic assembly; 31-first telescopic threaded member; 311-spiral convex strip; 312-insertion convex portion; 32-second telescopic threaded member; j-thread groove; k-spline groove; 321-blocking wall; 33-annular telescopic cover;

[0040] 4-roller brush shaft bracket; 41-annular convex ring;

[0041] 5-Bearing;

[0042] 6-disassembled parts of roller brush outer shaft; m-middle hole; n-annular groove; 61-annular end cover;

[0043] 7-opening retaining spring;

[0044] 8-Spline. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] It should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "back", "side", "circumferential" and the like in the present invention indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In addition, the words "first", "second" and the like are only used to distinguish multiple components or structures with the same or similar structures, and do not represent any special limitation on the setting order or connection relationship.

[0047] Please refer to Figures 1 to 15The embodiment of the utility model provides a roller brush 100 with a variable outer diameter, which is used to be assembled into a cleaning device body (not shown in the figure) to clean dust, debris and other debris on the floor. It should be noted that the cleaning device can be a cleaning appliance such as a vacuum cleaner and a cleaning robot. The roller brush 100 with a variable outer diameter has a first end away from a driving member (not shown in the figure) and a second end close to the driving member; optionally, the driving member can be a driving motor. The roller brush 100 with a variable outer diameter includes: a roller brush outer shaft assembly 1, a roller brush inner shaft assembly 2, and a rotating telescopic assembly 3; wherein the roller brush outer shaft assembly 1 has an inner cavity a arranged along the axial direction, and the outer diameter of the first end of the roller brush outer shaft assembly 1 is smaller than the outer diameter of the second end; the roller brush inner shaft assembly 2 and the rotating telescopic assembly 3 are fixedly connected, and at least partially movably assembled in the inner cavity a, and can drive the roller brush outer shaft assembly 1 to rotate synchronously; the rotating telescopic assembly and the driving member are transmission-connected to receive the torque of the driving member. The rotating telescopic assembly 3 is used to drive the roller brush inner shaft assembly 2 to translate toward the first end when receiving a positive torque, so as to squeeze the inner wall of the first end of the inner cavity a, so that the first end of the roller brush outer shaft assembly 1 expands radially, and after reaching the first limit position, drives the roller brush inner shaft assembly 2 to rotate forward, and then drives the roller brush outer shaft assembly 1 to rotate forward synchronously; when the rotating telescopic assembly 3 receives a reverse torque, it drives the roller brush inner shaft assembly 2 to translate toward the second end, so as to radially contract the first end of the roller brush outer shaft assembly 1, and after reaching the second limit position, drives the roller brush inner shaft assembly 2 to reverse, and then drives the roller brush outer shaft assembly 1 to reverse synchronously. Specifically, in this embodiment, the positive torque is not limited to a clockwise torque, but can also be a counterclockwise torque, as long as it can make the rotating telescopic assembly 3 push the roller brush inner shaft assembly 2 to translate toward the first end, it is a positive torque.

[0048] Because the roller brush outer shaft assembly 1 of the roller brush 100 with variable outer diameter can expand radially or contract radially at the first end of the roller brush outer shaft assembly 1 under the action of the rotating telescopic assembly 3 and the roller brush inner shaft assembly 2, the roller brush 100 with variable outer diameter can have a first working state in which the shaft diameters of the first and second ends of the roller brush outer shaft assembly 1 are equal, and a second working state in which the shaft diameter of the first end of the roller brush outer shaft assembly 1 is smaller than the shaft diameter of the second end; in the first working state, since the left and right ends of the outer diameter of the roller brush outer shaft assembly 1 are the same, both can clean the ground; and in the second working state, since the roller brush outer shaft assembly 1 has a large opening at the first end and the ground, the air pump (not shown in the figure) can easily generate a large negative pressure here, which can accelerate the guidance of hair to be collected at the first end away from the motor end, and finally collect the hair into the dust box under the action of negative pressure suction to avoid hair entanglement; therefore, it has the advantages that the hair is easily guided to be collected away from the motor end and is not easy to be entangled on the roller brush.

[0049] In order to realize the horizontal movement and rotation of the rotating telescopic component 3 to drive the roller brush inner shaft component 2, please refer to Figures 2 to 4, Optionally, in this embodiment, the rotary telescopic assembly 3 includes: a first telescopic threaded member 31 and a second telescopic threaded member 32; the first telescopic threaded member 31 has an external thread, specifically, the external thread is a plurality of spiral convex strips 311 arranged at intervals along the outer circumference of the first telescopic threaded member 31. The first telescopic threaded member 31 is transmission-connected with the driving member, specifically, the end of the first telescopic threaded member 31 close to the driving member has a plug-in convex portion 312, which is fixedly connected with the plug-in groove (not shown in the figure) at the output end of the driving member. The second telescopic threaded member 32 has an internal thread, specifically, the internal thread is a thread groove j arranged along the inner circumferential wall of the second telescopic threaded member 32 and corresponding to the spiral convex strips 311, and the two ends of the internal thread have a blocking structure for blocking the movement of the external thread; the second telescopic threaded member 32 is threadedly connected with the first telescopic threaded member 31 and fixedly connected with the roller brush inner shaft assembly 2. Specifically, the first end of the second telescopic threaded member 32 has a spline groove k, and the roller brush inner shaft assembly 2 is fixedly connected with the second telescopic threaded member 32 through the spline 8.

[0050] Since the second telescopic threaded member 32 is threadedly connected to the first telescopic threaded member 31, and the second telescopic threaded member 32 is fixedly connected to the roller brush inner shaft assembly 2, and the roller brush inner shaft assembly 2 is assembled with the roller brush outer shaft assembly 1, it is equivalent to assembling a load on the second telescopic threaded member 32. In this way, when the first telescopic threaded member 31 receives a positive torque, the second telescopic threaded member 32 can translate toward the first end to squeeze the inner wall of the first end of the inner cavity a, so that the first end of the roller brush outer shaft assembly 1 radially expands. After reaching the first limit position, the blocking structure limits the relative movement of the outer thread of the first telescopic threaded member 31, so that the first telescopic threaded member 31 drives the second telescopic threaded member 32 to rotate forward synchronously, and then drives the roller brush inner shaft assembly 2 to rotate forward. When the first telescopic threaded member 31 receives a reverse torque, its movement principle is similar, so it is not repeated.

[0051] It is understandable that in other embodiments, the first telescopic thread member 31 may be configured to have an internal thread, and the second telescopic thread member 32 may be configured to have a corresponding external thread. In this way, the same effect can be achieved, and no specific limitation is made herein.

[0052] For details, please refer to Figure 3 to Figure 4 In this embodiment, the blocking structure includes a blocking wall 321 located at the end of the inner thread of the second telescopic thread member 32 , and an annular telescopic cover 33 covering the second end of the second telescopic thread member 32 .

[0053] In order to make the first end of the roller brush outer shaft assembly 1 realize radial expansion or radial contraction, optionally, please refer to Figure 7 , Fig. 9 , Fig.10 , Fig.11 and Fig.12In this embodiment, the inner cavity a of the roller brush outer shaft assembly 1 includes a first section b close to the first end, and a second section d away from the first end, and the inner diameter of the first section b is smaller than the inner diameter of the second section d. The roller brush inner shaft assembly 2 includes a roller brush inner shaft 21, and the first end of the roller brush inner shaft 21 includes at least a first extrusion section g and a second extrusion section h; the first extrusion section g is in the shape of a cone or a truncated cone; the second extrusion section h is in the shape of a cylinder and connected to the first extrusion section g. In this way, when the first extrusion section g and / or the second extrusion section h of the roller brush inner shaft 21 squeeze the first section b of the inner cavity a, the first end of the roller brush outer shaft assembly 1 radially expands. In order to facilitate the squeezing of the first end of the roller brush inner shaft 21, preferably, the inner cavity a of the roller brush outer shaft assembly 1 also includes an introduction section c connecting the first section b and the second section d, and the inner diameter changes from small to large. Optionally, a leading section o with a diameter smaller than the first extrusion section g and the second extrusion section h can be provided in front of the first extrusion section g of the roller brush inner shaft 21, so that when the leading section o of the roller brush inner shaft 21 is located in the first section b of the inner cavity a, the first end of the roller brush outer shaft assembly 1 does not expand, so that the roller brush 100 with a variable outer diameter is in the second working state.

[0054] In order to make the outer diameter of the first end of the inner cavity a of the roller brush outer shaft assembly 1 expand or shrink accordingly when it is squeezed or restored, optionally, please refer to Figure 5 , Figure 7 , Fig. 9 , Fig.11 and Fig.12 In this embodiment, the roller brush outer shaft assembly 1 includes a roller brush outer shaft body 11; the roller brush outer shaft body 11 includes a hard rubber support part 12 and an expansion connection part 13; and a plurality of hard rubber support parts 12 are distributed at intervals along the circumferential direction and extend in the axial direction; the expansion connection part 13 connects two adjacent hard rubber support parts 12; the inner wall of the hard rubber support part 12 has a convex strip 121 extending in the axial direction, and the end of the plurality of convex strips 121 close to the axial center forms the first section b of the inner cavity a. The inner cavity a of the roller brush outer shaft assembly 1 is formed by the inner surface of the hard rubber support part 12 and the expansion connection part 13 of the roller brush outer shaft body 11 and the end surface of the convex strip 121 close to the axial center. In this way, when the first end of the roller brush inner shaft 21 squeezes into the first section b of the inner cavity a, the first section b of the inner cavity a formed by the convex strip 121 expands radially, thereby causing the hard rubber support part 12 to expand radially, and the expansion connection part 13 is correspondingly expanded, thereby increasing the outer diameter of the roller brush outer shaft body 11.

[0055] Preferably, please refer to Fig.11 and Fig.12 In this embodiment, the expansion connection part 13 is a soft rubber connection part; when the first end of the roller brush outer shaft body 11 radially contracts, the soft rubber connection part is wrinkled; when the first end of the roller brush outer shaft body 11 radially expands, the soft rubber connection part is stretched.

[0056] In order to prevent dust from entering the inner cavity a and damaging the roller brush inner shaft assembly 2 or causing blockage of the inner cavity a of the roller brush outer shaft assembly 1, preferably, please refer to Fig.13 In this embodiment, the roller brush outer shaft assembly 1 also includes a roller brush end cover 14 covering the first end of the brush outer shaft body; since the first end of the brush outer shaft body can be radially expanded or contracted, adaptively, the roller brush end cover 14 also has a plurality of hard rubber end cover portions 141, and a soft rubber expansion portion 142 connected between adjacent hard rubber end cover portions 141.

[0057] Optionally, see Figure 5 In this embodiment, the outer circumference of the roller brush outer shaft body 11 is spirally equipped with roller brush bristles 15 and roller brush scraping strips 16 to facilitate the cleaning of dust, paper scraps and other garbage.

[0058] Optionally, see Figure 2 , Fig. 9 and Fig.10 In this embodiment, the convex strip 121 extends axially from the first end of the inner cavity a of the roller brush outer shaft assembly 1 to the second end; the roller brush inner shaft 21 also includes a driving sleeve 211 disposed on its outer periphery and having a slide groove i that slidably cooperates with the convex strip 121 and is used to drive the roller brush outer shaft assembly 1 to rotate coaxially; in this way, when the roller brush inner shaft 21 rotates, it can drive the roller brush outer shaft assembly 1 to rotate through the driving sleeve 211. For further information, please refer to Fig. 9 In this embodiment, the convex strip 121 has a step surface f, and the roller brush inner shaft assembly 2 also includes a gasket 22 and a compression spring 23 which are sequentially sleeved on the outer periphery of the roller brush inner shaft 21 and located between the step surface f and the driving sleeve 211; thus, when the rotating telescopic assembly 3 receives a positive torque, the roller brush inner shaft 21 translates toward the first end, and the driving sleeve 211 compresses the compression spring 23; when the rotating telescopic assembly 3 receives a reverse torque, or does not receive a torque, the compression spring 23 releases elastic potential energy, pushing the roller brush inner shaft 21 to translate toward the second end.

[0059] Please refer to Figure 2 , Fig.14 and Fig.15On the other hand, this embodiment provides a cleaning device (not shown in the figure). It should be noted that the cleaning device can be a cleaning appliance such as a vacuum cleaner or a cleaning robot. It includes a cleaning device body, a driving member (not shown in the figure) assembled in the cleaning device body, and a roller brush 100 with a variable outer diameter as described above, which is transmission-connected to the driving member, and the roller brush 100 with a variable outer diameter is assembled in the cleaning device body through a roller brush shaft bracket 4 at one end close to the driving member. Since the cleaning device has all the structures and connection relationships of the roller brush 100 with a variable outer diameter, it has all the advantages of the roller brush 100 with a variable outer diameter, which will not be elaborated here. In addition, in order to make the rotation of the roller brush outer shaft assembly 1 more stable, an annular convex ring 41 is provided in the direction of the first end from the center of the roller brush shaft bracket 4, and a bearing 5 is sleeved on the outer periphery of the annular convex ring 41, and the roller brush outer shaft body 11 is sleeved on the outer ring of the bearing 5. In addition, in order to facilitate the disassembly of the roller brush 100 with a variable outer diameter, the roller brush 100 with a variable outer diameter also includes a roller brush outer shaft disassembly 6 and an open retaining ring 7; the roller brush outer shaft disassembly 6 is penetrated through the inner ring of the annular convex ring 41, the roller brush outer shaft disassembly 6 has a center hole m, and the roller brush inner shaft 21 is penetrated through the center hole m of the roller brush outer shaft disassembly 6; and the end of the roller brush outer shaft disassembly 6 close to the driving member has an annular groove n, and the end of the roller brush outer shaft disassembly 6 away from the driving member has an annular end cover 61, the annular end cover 61 abuts against one side of the bearing 5, and the open retaining ring 7 is clamped in the annular groove n.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A roller brush with a variable outer diameter, having a first end away from a driving member and a second end close to the driving member, characterized in that: include: A roller brush outer shaft assembly (1), a roller brush inner shaft assembly (2), and a rotating telescopic assembly (3); the roller brush outer shaft assembly (1) has an inner cavity (a) arranged along the axial direction, and the outer diameter of the first end thereof is smaller than the outer diameter of the second end; the roller brush inner shaft assembly (2) and the rotating telescopic assembly (3) are fixedly connected and at least partially movably assembled in the inner cavity (a), and can drive the roller brush outer shaft assembly (1) to rotate synchronously; wherein, The rotating and telescopic component (3) is used to drive the roller brush inner shaft component (2) to translate toward the first end when receiving a positive torque, so as to squeeze the inner wall of the first end of the inner cavity (a), and the first end of the roller brush outer shaft component (1) radially expands, and after reaching the first extreme position, drives the roller brush inner shaft component (2) to rotate forward; and when receiving a reverse torque, drives the roller brush inner shaft component (2) to translate toward the second end, so as to make the first end of the roller brush outer shaft component (1) radially contract, and after reaching the second extreme position, drives the roller brush inner shaft component (2) to reverse.

2. The roller brush with variable outer diameter according to claim 1, characterized in that: The rotary telescopic assembly (3) comprises: a first telescopic threaded member (31) and a second telescopic threaded member (32); one of the first telescopic threaded member (31) and the second telescopic threaded member (32) has an internal thread, and the other of the first telescopic threaded member (31) and the second telescopic threaded member (32) has an external thread, and the end of the internal thread has a blocking structure for blocking the movement of the external thread; the first telescopic threaded member (31) is transmission-connected to a driving member; the second telescopic threaded member (32) is threadedly connected to the first telescopic threaded member (31) and is fixedly connected to the roller brush inner shaft assembly (2).

3. The roller brush with variable outer diameter as claimed in claim 2, characterized in that: The blocking structure comprises a blocking wall (321) located at the end of the inner thread of the second telescopic threaded member (32), and an annular telescopic cover (33) covering the second end of the second telescopic threaded member (32).

4. The roller brush with variable outer diameter as claimed in claim 3, characterized in that: The inner cavity (a) comprises a first section (b) close to the first end, and a second section (d) far from the first end, the inner diameter of the first section (b) being smaller than the inner diameter of the second section (d); the roller brush inner shaft assembly (2) comprises a roller brush inner shaft (21), and the first end of the roller brush inner shaft (21) comprises at least a first extrusion section (g) in the shape of a cone or a truncated cone, and a second extrusion section (h) in the shape of a cylinder connected to the first extrusion section (g); so that when the first extrusion section (g) and the second extrusion section (h) of the roller brush inner shaft (21) extrudes the first section (b) of the inner cavity (a), the first end of the roller brush outer shaft assembly (1) expands radially.

5. The roller brush with variable outer diameter as claimed in claim 4, characterized in that: The roller brush outer shaft assembly (1) comprises a roller brush outer shaft body (11); the roller brush outer shaft body (11) comprises a hard rubber support portion (12) and an expansion connection portion (13), and a plurality of the hard rubber support portions (12) are distributed at intervals along the circumferential direction, and the expansion connection portion (13) connects two adjacent hard rubber support portions (12); the inner wall of the hard rubber support portion (12) has a convex strip (121) extending in the axial direction, and a plurality of the convex strips (121) at one end close to the axial center form a first section (b) of the inner cavity (a).

6. The roller brush with variable outer diameter as claimed in claim 5, characterized in that: The expansion connection part (13) is a soft rubber connection part; when the first end of the roller brush outer shaft body (11) contracts radially, the soft rubber connection part is in a wrinkled shape; when the first end of the roller brush outer shaft body (11) expands radially, the soft rubber connection part is in a stretched shape.

7. The roller brush with variable outer diameter according to claim 6, characterized in that: The roller brush outer shaft assembly (1) also includes a roller brush end cover (14) which is covered on the first end of the brush outer shaft body, and the roller brush end cover (14) has a plurality of hard rubber end cover parts (141) and a soft rubber expansion part (142) connected between adjacent hard rubber end cover parts (141).

8. The roller brush with variable outer diameter according to claim 7, characterized in that: The outer circumference of the roller brush outer shaft body (11) is spirally equipped with roller brush bristle strips (15) and roller brush scraping strips (16).

9. The roller brush with variable outer diameter according to claim 5, characterized in that: The roller brush inner shaft (21) also includes a driving sleeve (211) which is arranged on its outer periphery and has a slide groove (i) which is slidably matched with the convex strip (121) and is used to drive the roller brush outer shaft assembly (1) to rotate coaxially; the convex strip (121) has a step surface (f); the roller brush inner shaft assembly (2) also includes a gasket (22) and a compression spring (23) which are sequentially sleeved on the outer periphery of the roller brush inner shaft (21) and located between the step surface (f) and the driving sleeve (211); the second telescopic threaded member (32) has a spline groove (k); the second end of the roller brush inner shaft (21) is fixedly connected to the second telescopic threaded member (32) via a spline (8).

10. A cleaning device, characterized in that: It comprises a cleaning device body, a driving member assembled in the cleaning device body, and a roller brush with a variable outer diameter as described in any one of claims 1 to 9, which is transmission-connected to the driving member, and the roller brush with a variable outer diameter is assembled in the cleaning device body through a roller brush shaft bracket (4) at one end of the roller brush with a variable outer diameter close to the driving member.

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