Outer barrel cleaning brush and washing machine

Abstract

The utility model discloses an outer cylinder cleaning brush and a washing machine, and the outer cylinder cleaning brush comprises a brush box which can be installed on an inner cylinder of the washing machine, and one side of the brush box is provided with an opening; the mounting rod is rotationally mounted on the brush box; the brush is mounted on the mounting rod, the brush extends out of the brush box through the opening, and the direction of the brush can be adjusted through rotation of the mounting rod, so that the brush can be in contact with an outer barrel of the washing machine or keep a distance from the outer barrel. During cleaning operation, the outer cylinder cleaning brush can rotate along with the inner cylinder so as to brush the inner wall of the outer cylinder, and the purpose of effectively cleaning the outer cylinder is achieved. According to the scheme, the brush structure is adopted for brushing the outer cylinder, a water diversion pipeline does not need to be arranged for traction, and the advantages of being simple in structure and easy to achieve are achieved. Moreover, the brushing of the outer cylinder by the brush is not influenced by accumulated water in the washing cylinder, so that the cleaning effect is better.

Description

Technical Field

[0001] The present application relates to the technical field of washing machines, and particularly to an outer tub cleaning brush and a washing machine. Background Art

[0002] The drum structure of a washing machine includes an outer tub and an inner tub structure. The outer tub is a fixed tub, and the inner tub is installed inside the outer tub. The rotating shaft of the motor passes through the bottom of the outer tub and is connected to the inner tub. The motor is used to drive the inner tub to rotate, so that the inner tub pushes the clothes to operate to achieve the laundry function. There is a certain gap between the inner tub and the outer tub. The inner wall of the outer tub and the outer wall of the inner tub are wall surfaces that the clothes cannot contact. After long-term use, dirt is likely to accumulate on the inner wall of the outer tub and the outer wall of the inner tub, and bacteria will breed. Therefore, an automatic cleaning system is integrated in some washing machines to achieve the automatic cleaning function. For example, the Chinese authorized patent CN219808127U discloses an outer tub cleaning system and a washing machine, which directly set a rib structure with water spraying holes and a water storage cavity on the side wall of the inner tub, and introduce a water inlet pipe into the water storage cavity. During operation, the rib structure can rotate with the inner tub, and the water spraying holes spray water towards the inner wall of the outer tub to achieve the cleaning of the inner wall of the outer tub. However, there are certain defects in the way of washing with pressurized water: since the inner tub is a rotating structure, the water storage structure installed on it needs to rotate, resulting in problems such as high pipe laying difficulty and complex pipe laying structure of the water storage structure; in addition, when a certain amount of water accumulates in the washing tub, the water sprayed out from the water spraying holes will consume the scouring force when it flushes into the accumulated water, resulting in the inability to effectively wash the wall surface of the outer tub, thereby affecting the washing effect. Summary of the Utility Model

[0003] The purpose of the embodiments of the present utility model is to provide an outer tub cleaning brush and a washing machine, which can solve the above problems existing in the prior art.

[0004] To achieve the above object, the present application adopts the following technical solutions:

[0005] On the one hand, an outer tub cleaning brush is provided, including:

[0006] A brush box, which can be installed on the inner tub of the washing machine, and one side of the brush box is provided with an opening;

[0007] A mounting rod, which is rotatably installed in the brush box;

[0008] A brush, which is installed on the mounting rod. The brush extends out of the brush box through the opening. The direction of the brush can be adjusted by rotating the mounting rod, so that the brush can contact the outer tub of the washing machine or keep a distance from the outer tub.

[0009] Optionally, a first positioning block is provided inside the brush box, and a second positioning block is correspondingly provided on the mounting rod. The mounting rod can be locked by engaging the first positioning block with the second positioning block; the mounting rod can move relative to the brush box along its axial direction, and the axial movement of the mounting rod can drive the second positioning block to engage or disengage from the first positioning block.

[0010] Optionally, the first positioning block is provided with a first card slot and a second card slot, and the second positioning block is provided with a card block. When the card block is engaged with the first card slot, the brush is in a direction capable of contacting the outer cylinder; when the card block is engaged with the second card slot, the brush is in a direction maintaining a distance from the outer cylinder.

[0011] Optionally, a spring retainer is fixedly provided on the mounting rod, and a locking spring is sleeved outside the mounting rod. One end of the locking spring abuts against the spring retainer, and the other end abuts against the inner wall of the brush box. The locking spring always provides an elastic force to drive the second positioning block to engage with the first positioning block to the mounting rod.

[0012] Optionally, one end of the mounting rod is connected with a handle extending outside the brush box, and the mounting rod can be pushed and twisted through the handle.

[0013] Optionally, an installation groove extending in the axial direction is provided on the mounting rod. The brush includes a fixed clamping strip and a brush body. The fixed clamping strip is provided with a clamping groove, the fixed clamping strip is installed in the installation groove, and the brush body is clamped in the clamping groove.

[0014] On the other hand, a washing machine is provided, including a washing tub and the above-mentioned outer cylinder cleaning brush. The washing tub includes an outer cylinder and an inner cylinder. The inner cylinder is provided with a cleaning window. The brush box is installed inside the inner cylinder, and the opening on the brush box is aligned with the cleaning window. The brush extends outside the inner cylinder through the cleaning window to contact the outer cylinder.

[0015] Optionally, three cleaning windows are circumferentially and evenly distributed on the inner cylinder, and each cleaning window correspondingly installs one outer cylinder cleaning brush.

[0016] Optionally, a sliding groove is provided on the side of the inner cylinder where the cleaning window is located, and an installation edge that can slide into the sliding groove is provided on the circumference of the brush box. The brush box is detachably installed on the inner cylinder through the clamping connection between the installation edge and the sliding groove.

[0017] Optionally, an elastic buckle is provided on the brush box, and a buckle hole is correspondingly provided on the inner cylinder. The brush box is locked on the inner cylinder by buckling the elastic buckle with the buckle hole.

[0018] The beneficial effects of this application are as follows: The present utility model provides an outer tub cleaning brush and a washing machine. The outer tub cleaning brush can be installed on the inner tub of the washing machine. When performing a cleaning operation, the outer tub cleaning brush can rotate with the inner tub to brush the inner wall of the outer tub, achieving the purpose of effectively cleaning the outer tub. This solution uses a brush structure to brush the outer tub, eliminating the need to consider laying a water supply pipeline for it, and has the advantages of simple structure and easy implementation. Moreover, the brushing of the outer tub by the brush is not affected by the accumulated water in the washing tub, resulting in a better cleaning effect. Importantly, in the structure of the outer tub cleaning brush of this solution, the direction of the brush is set to be adjustable. When an outer tub cleaning operation is required, the brush is adjusted to a direction where it can contact the inner wall of the outer tub, and normal cleaning operations can be carried out after starting the washing machine; in the normal use state, the brush can be adjusted to a position where it is spaced from the outer tub, avoiding the problem of rapid wear of the brush caused by long-term friction between the brush and the outer tub, and extending the service life of the brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further elaborates on this application in detail based on the drawings and embodiments.

[0020] Figure 1 is a schematic structural diagram of the washing machine according to the embodiment of this application;

[0021] Figure 2 is an exploded schematic diagram of the washing machine according to the embodiment of this application;

[0022] Figure 3 is a schematic structural diagram of the outer tub cleaning brush installed on the inner tub according to the embodiment of this application;

[0023] Figure 4 is Figure 3 an exploded schematic diagram of the structure shown;

[0024] Figure 5 is a schematic structural diagram of the outer tub cleaning brush according to the embodiment of this application;

[0025] Figure 6 is an exploded schematic diagram of the outer tub cleaning brush according to the embodiment of this application;

[0026] Figure 7 is Figure 6 an enlarged view of area A in;

[0027] Figure 8 is a cross-sectional view of the outer tub cleaning brush according to the embodiment of this application.

[0028] In the figure:

[0029] 1. Outer cylinder cleaning brush; 11. Brush box; 111. Installation edge; 12. Brush; 121. Brush body; 122. Fixed clamping strip; 13. Installation rod; 131. Second positioning block; 1311. Clamping block; 132. Spring retaining piece; 14. First positioning block; 141. First card slot; 142. Second card slot; 15. Locking spring; 16. Handle; 2. Inner cylinder; 21. Cleaning window; 22. Slide groove; 3. Outer cylinder; 4. Motor. Detailed implementation manners

[0030] To make the technical problems solved by this application, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of this application will be further described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of this application.

[0031] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific situations.

[0032] In this application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0033] The drum structure of the washing machine includes an outer tub and an inner tub structure. The outer tub is a fixed tub, and the inner tub is installed inside the outer tub. The rotating shaft of the motor passes through the bottom of the outer tub and is connected to the inner tub. The motor is used to drive the inner tub to rotate, so that the inner tub pushes the clothes to operate to achieve the washing function. There will be a certain gap between the inner tub and the outer tub. The inner wall of the outer tub and the outer wall of the inner tub are wall surfaces that the clothes cannot touch. After long-term use, dirt is likely to accumulate on the inner wall of the outer tub and the outer wall of the inner tub, and bacteria will breed. Therefore, a self-cleaning system is integrated in some washing machines to achieve the automatic cleaning function. For example, the Chinese authorized patent CN219808127U discloses an outer tub cleaning system and a washing machine, which directly set a rib structure with water spraying holes and a water storage cavity on the side wall of the inner tub, and introduce a water inlet pipe into the water storage cavity. During operation, the rib structure can rotate with the inner tub, and the water spraying holes spray water towards the inner wall of the outer tub to achieve the cleaning of the inner wall of the outer tub. However, there are certain defects in the way of flushing with pressurized water: since the inner tub is a rotating structure, the water storage structure installed on it needs to rotate, resulting in problems such as high pipe laying difficulty and complex pipe laying structure of the water storage structure; in addition, when a certain amount of water accumulates in the washing tub, the water sprayed out from the water spraying holes will consume the flushing force when it flushes into the accumulated water, resulting in ineffective flushing of the wall surface of the outer tub, thereby affecting the flushing effect.

[0034] To overcome the above technical problems for reference Figure 1-8 , an outer tub cleaning brush 1 can be installed on the inner tub 2 of the washing machine, and the brush 12 on it is arranged towards the inner wall of the outer tub 3 of the washing machine. When performing the cleaning operation, water and detergent can be injected into the washing tub, and then the motor 4 is started to drive the inner tub 2 to rotate, so that the outer tub cleaning brush 1 can operate to brush the inner wall of the outer tub 3.

[0035] The outer tub cleaning brush 1 of this embodiment includes a brush box 11, a mounting rod 13 and a brush 12. The brush box 11 can be installed on the inner tub 2 of the washing machine, and one side of the brush box 11 is provided with an opening; the mounting rod 13 is rotatably installed in the brush box 11; the brush 12 is installed on the mounting rod 13, and the brush 12 extends out of the brush box 11 through the opening. The direction of the brush 12 can be adjusted by the rotation of the mounting rod 13, so that the brush 12 can contact the outer tub 3 of the washing machine or keep a distance from the outer tub 3.

[0036] Based on the outer cylinder cleaning brush 1 of this embodiment, during the cleaning operation, the outer cylinder cleaning brush 1 can rotate along with the inner cylinder 2 to brush the inner wall of the outer cylinder 3, achieving the purpose of effectively cleaning the outer cylinder 3. This solution uses the brush 12 structure to brush the outer cylinder 3, without the need to consider laying a water pipe for traction, and has the advantages of simple structure and easy implementation. Moreover, the brushing of the outer cylinder 3 by the brush 12 is not affected by the accumulated water in the washing cylinder, and the cleaning effect is better. Importantly, in the structure of the outer cylinder cleaning brush 1 of this solution, the direction of the brush 12 is set to be adjustable. When the outer cylinder 3 needs to be cleaned, the brush 12 is adjusted to a direction that can contact the inner wall of the outer cylinder 3, and normal cleaning operations can be carried out after starting the washing machine; in the normal use state, the brush 12 can be adjusted to a position that keeps a distance from the outer cylinder 3, avoiding the problem that the brush 12 is quickly worn due to long-term friction with the outer cylinder 3, and extending the service life of the brush 12.

[0037] In one embodiment, a first positioning block 14 is provided in the brush box 11, and a second positioning block 131 is correspondingly provided on the mounting rod 13. The mounting rod 13 can be locked by the engagement of the first positioning block 14 and the second positioning block 131; the mounting rod 13 can move relative to the brush box 11 along its own axial direction, and the engagement or separation of the second positioning block 131 and the first positioning block 14 can be driven by the axial movement of the mounting rod 13.

[0038] The structure of the separable first positioning block 14 and second positioning block 131 not only meets the requirement of rotating the mounting rod 13 to adjust the direction of the brush 12, but also can lock the mounting rod 13 after adjustment, so that the brush 12 maintains a fixed direction and avoids the problem that the brush 12 swings randomly when the inner cylinder 2 rotates. Specifically, when the direction of the brush 12 needs to be adjusted, first axially push the mounting rod 13 to separate the first positioning block 14 on it from the second positioning block 131, and then rotate the mounting rod 13 to a suitable position, and then move the mounting rod 13 in the opposite direction to combine the first positioning block 14 and the second positioning block 131, thereby locking the mounting rod 13.

[0039] In one embodiment, referring to Figure 7 , the first positioning block 14 is provided with a first card slot 141 and a second card slot 142, the second positioning block 131 is provided with a card block 1311, when the card block 1311 is engaged with the first card slot 141, the brush 12 is in a direction that can contact the outer cylinder 3; when the card block 1311 is engaged with the second card slot 142, the brush 12 is in a direction that keeps a distance from the outer cylinder 3.

[0040] Through the cooperation of the card slot and the card block 1311, the precise adjustment of the direction of the brush 12 is achieved. In the locked state, the mounting rod 13 and the brush 12 can remain stable, avoiding random swaying during the operation of the inner cylinder 2. Based on the operation process of this solution structure, it is simple and intuitive, and users can easily adjust the direction of the brush 12 according to their needs.

[0041] In one embodiment, referring to Figure 8 , a spring retaining piece 132 is fixedly provided on the mounting rod 13, a locking spring 15 is sleeved outside the mounting rod 13, one end of the locking spring 15 abuts against the spring retaining piece 132, and the other end abuts against the inner wall of the brush box 11. The locking spring 15 always provides an elastic force to drive the second positioning block 131 to engage with the first positioning block 14 to the mounting rod 13.

[0042] Under normal circumstances, the locking spring 15 provides a continuous thrust to the mounting rod 13 by abutting against the spring retaining piece 132 and the inner wall of the brush box 11. This thrust makes the second positioning block 131 always tend to move towards the first positioning block 14, so as to maintain the locked state of the mounting rod 13. When the user needs to adjust the direction of the brush 12, it is necessary to overcome the elastic force of the locking spring 15 and axially push the mounting rod 13 to separate the second positioning block 131 from the first positioning block 14. Once separated, the user can rotate the mounting rod 13 to the desired position. After rotating in place, the user only needs to release the mounting rod 13, and the elastic force of the locking spring 15 will automatically push the second positioning block 131 towards the first positioning block 14 and make the card block 1311 on it engage with the corresponding card slot, thus completing the re-locking of the mounting rod 13. Through the automatic elastic force of the locking spring 15, the automatic locking of the mounting rod 13 is realized, simplifying the operation process of the user. In the locked state, due to the continuous thrust of the locking spring 15, the mounting rod 13 and the brush 12 can remain stable and are not easy to loosen.

[0043] In one embodiment, one end of the mounting rod 13 is connected with a handle 16 extending outside the brush box 11, and the mounting rod 13 can be pushed and twisted through the handle 16.

[0044] By connecting a handle 16 extending outside the brush box 11 at one end of the mounting rod 13, a convenient operating member is provided for the user, enabling the user to easily push and twist the mounting rod 13 to adjust the direction of the brush 12, making the operation process more intuitive and labor-saving.

[0045] In one embodiment, referring to Figure 6 , an installation groove extending in the axial direction is provided on the mounting rod 13. The brush 12 includes a fixed clamping strip 122 and a brush body 121. The fixed clamping strip 122 is provided with a clamping groove, the fixed clamping strip 122 is installed in the installation groove, and the brush body 121 is clamped in the clamping groove.

[0046] The cooperative design of the installation groove and the fixing clip 122 ensures the stability of the brush 12 during rotation and adjustment, avoiding the problems of loosening or falling off of the brush body 121. In addition, the design of the installation groove and the fixing clip 122 makes the installation and maintenance of the brush 12 simple and fast, facilitating the cleaning and replacement of the brush 12.

[0047] On the other hand, this embodiment also provides a washing machine, including a washing tub and the above-mentioned outer tub cleaning brush 1. The washing tub includes an outer tub 3 and an inner tub 2. The inner tub 2 is provided with a cleaning window 21. The brush box 11 is installed inside the inner tub 2, and the opening on the brush box 11 is aligned with the cleaning window 21. The brush 12 extends outside the inner tub 2 through the cleaning window 21 to contact the outer tub 3.

[0048] By arranging the outer tub cleaning brush 1 in the inner tub 2 in this solution, the inner wall of the outer tub 3 can be automatically brushed, and the brushing structure of this solution has the advantages of simple structure and easy implementation.

[0049] In one embodiment, three cleaning windows 21 are circumferentially and evenly distributed on the inner tub 2, and one outer tub cleaning brush 1 is correspondingly installed for each cleaning window 21.

[0050] Multiple outer tub cleaning brushes 1 working simultaneously can significantly shorten the cleaning time and improve the cleaning efficiency.

[0051] In one embodiment, referring to Figure 3-4 , a sliding groove 22 is provided on the side of the inner tub 2 where the cleaning window 21 is located. An installation edge 111 that can slide into the sliding groove 22 is provided on the circumference of the brush box 11. The brush box 11 is detachably installed on the inner tub 2 through the snap connection between the installation edge 111 and the sliding groove 22.

[0052] The detachable design of the brush box 11 enables users to easily install and disassemble it without complex tools or operations. The detachable design of the brush box 11 allows users to conveniently clean and maintain the brush box 11, extending the service life of the brush box 11 and the washing machine. The snap connection between the installation edge 111 and the sliding groove 22 ensures the stability of the brush box 11 during the cleaning process, preventing the brush box 11 from loosening or falling off.

[0053] In one embodiment, the brush box 11 is provided with an elastic buckle, and a buckle hole is correspondingly provided on the inner tub 2. The brush box 11 is locked on the inner tub 2 through the buckling of the elastic buckle and the buckle hole.

[0054] An elastic buckle is added to the brush box 11, and a buckle hole is correspondingly provided on the inner tub 2. Through the buckling of the elastic buckle and the buckle hole, the brush box 11 is locked on the inner tub 2, further enhancing the stability and reliability of the installation of the brush box 11.

[0055] In the description of this document, it should be understood that the terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", etc. are only for the convenience of description and simplifying operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on this application. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0056] In the description of this specification, the description referring to terms such as "an embodiment", "an example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0057] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0058] The technical principles of this application have been described above in connection with specific embodiments. These descriptions are only for explaining the principles of this application and should not be construed as a limitation on the protection scope of this application in any way. Based on the explanations herein, those skilled in the art can readily conceive of other specific implementation manners of this application without creative efforts, and these manners will fall within the protection scope of this application.

Claims

1. An outer cylinder cleaning brush, characterized in that: include: A brush box (11) can be installed on the inner drum (2) of the washing machine, and one side of the brush box (11) is provided with an opening; A mounting rod (13) rotatably mounted on the brush box (11); A brush (12) is mounted on the mounting rod (13); the brush (12) extends out of the brush box (11) through the opening; the direction of the brush (12) can be adjusted by rotating the mounting rod (13) so that the brush (12) can contact the outer drum (3) of the washing machine or maintain a distance from the outer drum (3).

2. The outer cylinder cleaning brush according to claim 1, characterized in that: A first positioning block (14) is provided in the brush box (11), and a second positioning block (131) is correspondingly provided on the mounting rod (13); the mounting rod (13) can be locked by the engagement of the first positioning block (14) and the second positioning block (131); the mounting rod (13) can move relative to the brush box (11) along its own axial direction, and the axial movement of the mounting rod (13) can drive the second positioning block (131) to engage with or separate from the first positioning block (14).

3. The outer cylinder cleaning brush according to claim 2, characterized in that: The first positioning block (14) is provided with a first clamping groove (141) and a second clamping groove (142); the second positioning block (131) is provided with a clamping block (1311); when the clamping block (1311) is engaged with the first clamping groove (141), the brush (12) is in a direction capable of contacting the outer cylinder (3); when the clamping block (1311) is engaged with the second clamping groove (142), the brush (12) is in a direction maintaining a distance from the outer cylinder (3).

4. The outer cylinder cleaning brush according to claim 2, characterized in that: A spring stopper (132) is fixedly provided on the installation rod (13), and a locking spring (15) is provided on the outer sleeve of the installation rod (13). One end of the locking spring (15) abuts against the spring stopper (132), and the other end abuts against the inner wall of the brush box (11). The locking spring (15) always provides an elastic force to the installation rod (13) to drive the second positioning block (131) to engage with the first positioning block (14).

5. The outer cylinder cleaning brush according to claim 2, characterized in that: One end of the installation rod (13) is connected to a handle (16) extending out of the brush box (11), and the installation rod (13) can be pushed and twisted by the handle (16).

6. The outer cylinder cleaning brush according to claim 1, characterized in that: The mounting rod (13) is provided with a mounting groove extending in the axial direction, the brush (12) comprises a fixing clamp (122) and a brush body (121), the fixing clamp (122) is provided with a clamping groove, the fixing clamp (122) is installed in the mounting groove, and the brush body (121) is clamped in the clamping groove.

7. A washing machine, characterized in that: The invention comprises a washing drum and an outer drum cleaning brush (1) as claimed in any one of claims 1 to 6, wherein the washing drum comprises an outer drum (3) and an inner drum (2), the inner drum (2) being provided with a cleaning window (21), the brush box (11) being installed on the inner side of the inner drum (2), the opening on the brush box (11) being aligned with the cleaning window (21), and the brush (12) extending through the cleaning window (21) to the outside of the inner drum (2) to contact the outer drum (3).

8. The washing machine according to claim 7, characterized in that: The inner cylinder (2) is evenly distributed with three cleaning windows (21) in the circumferential direction, and each cleaning window (21) is correspondingly installed with one outer cylinder cleaning brush (1).

9. The washing machine according to claim 7, characterized in that: A slide groove (22) is provided on the inner cylinder (2) at the side of the cleaning window (21), and a mounting edge (111) that can slide into the slide groove (22) is provided on the periphery of the brush box (11), and the brush box (11) is detachably mounted on the inner cylinder (2) by snapping the mounting edge (111) into the slide groove (22).

10. The washing machine according to claim 9, characterized in that: The brush box (11) is provided with an elastic buckle, and the inner cylinder (2) is correspondingly provided with a buckle hole, and the brush box (11) is locked on the inner cylinder (2) by buckling the elastic buckle with the buckle hole.

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