WO2021026718A1

WO2021026718A1 - Replaceable brush head and toothbrush with replaceable brush head

Info

Publication number: WO2021026718A1
Application number: PCT/CN2019/100174
Authority: WO
Inventors: 黄守仁
Original assignee: 龙昌日用品工业（南宁）有限公司
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2021-02-18

Abstract

A replaceable brush head (10) and a toothbrush with the replaceable brush head (10) , wherein the replaceable brush head (10) comprises a bristle seat (11, 11A, 11B), multiple bristles (12) and at least one brush head fixing member (13, 13A), the bristles (12) are arranged on the front side of the bristle seat (11, 11A, 11B), the brush head fixing members (13, 13A) are arranged on the bristle seat (11, 11A, 11B), and can be detachably combined with a brush handle (20) of the toothbrush, the toothbrush with the replaceable brush head (10) comprises the replaceable brush head (10) and the brush handle (20), the brush handle (20) is detachably connected to the replaceable brush head (10) through a handle connecting portion (22), with the replaceable brush head (10), when the bristles (12) on the replaceable brush head (10) gradually lose their cleaning ability due to long-term use, a user can detach the replaceable brush head (10) from the brush handle (20) and replace a new replaceable brush head (10) to achieve the purpose of continuously using the same brush handle (20), thereby saving the user's purchase cost.

Description

Replaceable brush head and toothbrush with replaceable brush head

Technical field

The invention relates to a toothbrush head for oral cleaning.

Background technique

Toothbrush is a sanitary product that is frequently used by ordinary people in daily life. Because the bristles of the toothbrush are easy to branch, loose or deform after a period of use, which will reduce the cleaning ability of the toothbrush, the toothbrush is a need Daily necessities that are changed frequently.

However, frequent replacement of the entire toothbrush not only costs the user a lot of money, but also a great harm to the entire natural environment. More precisely, the entire toothbrush is likely to be in the handle or other parts. In the usable state, the bristles are discarded by the user due to the wear of the bristles, resulting in rapid accumulation of discarded toothbrushes; therefore, how to reduce the rejection rate of toothbrushes, or how to use a single toothbrush more efficiently for a long time is the prior art A big problem to be overcome in China.

Summary of the invention

In view of the shortcomings and deficiencies of the prior art, the present invention provides a replaceable brush head and a toothbrush with a replaceable brush head. The brush head and bristles are designed to be separable from the brush handle. Therefore, when the bristles need to be replaced, the user can keep the part of the brush handle and continue to use, thereby reducing the generation of garbage and increasing the utilization rate of each toothbrush.

In order to achieve the above-mentioned object of the invention, the technical means adopted by the present invention is to provide a replaceable brush head, which can be used to install on a handle of a toothbrush, the replaceable brush head includes

A bristle holder, the opposite sides of which are respectively a front and a back;

A plurality of bristles, the bristles are arranged on the front surface of the bristle seat;

At least one brush head fixing member is arranged on the bristle seat and used for detachably combining with the handle of the toothbrush.

To achieve the above-mentioned purpose of the invention, the technical means adopted by the present invention is to provide a toothbrush with a replaceable brush head, which includes

A brush handle, which contains

A grip

A handle connecting part, which is formed at one end of the handle part;

A replaceable brush head, which is detachably mounted on the brush handle, and the replaceable brush head includes

At least one brush head fixing part is arranged on the bristle seat, and the handle connecting part is selectively connected with the at least one brush head fixing part.

The advantage of the present invention is that, through the replaceable brush head of the present invention, when the user installs the brush head on the handle of a toothbrush, the present invention can be used like a normal toothbrush; gradually with the time of use In addition, when the user thinks that the bristles have been worn out to the point where it needs to be replaced, the user can remove the replaceable brush head from the handle and replace it with a new set of replaceable brush heads. This eliminates the need to discard the entire toothbrush and reduces the rejection rate of the toothbrush, which not only saves the user the cost of buying a toothbrush, but also reduces the amount of garbage produced by each user.

Further, in the aforementioned replaceable brush head, the at least one brush head fixing member includes a connecting portion and a bump portion, the connecting portion is connected to the bristle seat, and the bump portion protrudes from the connecting portion The convex part is used for detachably combining with the handle of the toothbrush.

Furthermore, in the aforementioned replaceable brush head, the convex portion of the at least one brush head fixing member is formed with an abutting inclined surface formed on a side surface of the convex portion away from the bristles.

Furthermore, in the aforementioned replaceable brush head, the at least one brush head fixing member includes a connecting portion and a recessed portion, the connecting portion is connected to the bristle seat, and the recessed portion is recessed on the connecting portion, The recess is used for detachably combining with the handle of the toothbrush.

Furthermore, in the aforementioned replaceable brush head, in the at least one brush head fixing member, the surface of the connecting portion is flush with the surface of the bristle holder.

Furthermore, in the aforementioned replaceable brush head, the at least one brush head fixing member and the bristle holder are integrally formed.

Furthermore, in the aforementioned replaceable brush head, the at least one brush head fixing member includes a convex portion protruding from the bristle seat, and the convex portion is used to interact with the handle of the toothbrush In a detachable combination, a pushing inclined surface is formed on the protruding part, which is formed on a side of the protruding part away from the bristles.

Furthermore, the aforementioned replaceable brush head further includes a pressing cushion, which is combined with the back surface of the bristle holder.

Furthermore, the aforementioned replaceable brush head further includes a blocking piece provided between the back surface of the bristle holder and the pressing soft pad.

Furthermore, in the aforementioned replaceable brush head, the number of the at least one brush head fixing member is four, and the four brush head fixing members are circumferentially and spaced at the periphery of the side of the bristle holder.

Furthermore, the aforementioned toothbrush with a replaceable brush head, wherein the handle connecting portion includes a ring wall disposed at one end of the grip portion; and an accommodating hole formed in the middle of the ring wall The toothbrush with a replaceable brush head further includes a pressing cushion, which is connected to the inner wall surface of the ring wall, and the replaceable brush head is provided on opposite sides of the ring wall, and the pressing soft The pad can be squeezed and pushed against the replaceable brush head.

Furthermore, in the aforementioned toothbrush with a replaceable brush head, a side surface of the pressing pad facing the ring wall protrudes with an inverted hook portion protruding from the receiving hole of the ring wall, And the periphery of the undercut part is hooked around the periphery of the accommodating hole.

Furthermore, the aforementioned toothbrush with a replaceable brush head further includes a baffle which is arranged between the back surface of the bristle holder and the pressing cushion.

Furthermore, in the aforementioned toothbrush with a replaceable brush head, a plurality of baffle fitting portions are formed on the periphery of the baffle, and a plurality of soft pad fitting parts are formed on the periphery of the pressing cushion. The mat fitting parts are respectively fitted into the stopper fitting parts.

Furthermore, the aforementioned toothbrush with replaceable brush head, wherein the at least one brush head fixing member of the replaceable brush head includes a connecting portion and a bump portion, and the connecting portion is connected to the bristle seat, The convex portion protrudes from the connecting portion; the handle connecting portion includes a ring wall disposed at one end of the handle portion; an accommodating hole formed in the middle of the ring wall; a plurality of ring walls Connecting groove, the ring wall connecting groove is formed on the inner wall surface of the ring wall, and can be fixed with the at least one brush head fixing member of the replaceable brush head, so that the replaceable brush head and the brush The handles are detachably connected.

Furthermore, the aforementioned toothbrush with a replaceable brush head, wherein the at least one brush head fixing member of the replaceable brush head includes a connecting portion and a groove portion, and the connecting portion is connected to the bristle holder, The groove portion is recessed on the connecting portion; the handle connecting portion includes a ring wall disposed at one end of the handle portion; a receiving hole formed in the middle of the ring wall; a plurality of rings The wall connecting protrusion, the ring wall connecting protrusion is protrudingly formed on the inner wall surface of the ring wall, and can be fixed with the at least one brush head fixing part of the replaceable brush head, so that the replaceable brush head The head is detachably connected with the brush handle.

Description of the drawings

Fig. 1 is a perspective view of the toothbrush according to the first embodiment of the present invention.

2 is an enlarged perspective view of the replaceable head and part of the handle of the toothbrush according to the first embodiment of the present invention.

3 is an exploded view of the replaceable brush head and handle of the toothbrush according to the first embodiment of the present invention.

Fig. 4 is a partial enlarged view of Fig. 3.

5 is a cross-sectional rear view of the replaceable brush head of the toothbrush according to the first embodiment of the present invention.

Figure 6 is a cross-sectional side view (1) of the toothbrush of the first embodiment of the present invention.

Fig. 7 is a sectional side view (2) of the toothbrush of the first embodiment of the present invention.

Fig. 8 is an exploded view of the replaceable brush head and handle of the toothbrush according to the second embodiment of the present invention.

9 is an exploded view of the components of the replaceable brush head of the toothbrush according to the second embodiment of the present invention.

Fig. 10 is a side sectional view of the replaceable head of the toothbrush according to the second embodiment of the present invention.

Fig. 11 is an exploded view of the components of the replaceable brush head of the toothbrush according to the third embodiment of the present invention.

Fig. 12 is a side sectional view of the replaceable head of the toothbrush according to the third embodiment of the present invention.

detailed description

The following further describes the technical means adopted by the present invention to achieve the intended purpose of the invention in conjunction with the drawings and preferred embodiments of the present invention.

Please refer to FIG. 1, the first embodiment of the toothbrush with replaceable brush head of the present invention includes a replaceable brush head 10 and a brush handle 20. The replaceable brush head 10 is detachably disposed on the brush handle. 20, and the user can continue to use the same brush handle 20 by replacing the replaceable brush head 10.

More precisely, please refer to Figures 1, 2 and 3, the replaceable brush head 10 includes a bristle holder 11, a plurality of bristles 12, and at least one brush head fixing member 13. The opposite sides of the bristle holder 11 are respectively There is a front surface 111 and a back surface 112, and the bristles 12 are arranged on the front surface 111 of the bristle holder 11.

Please refer to FIG. 3 and FIG. 4, in the main embodiment, the number of the at least one brush head fixing member 13 is four, and the four brush head fixing members 13 are arranged on the bristle holder 11 at equal angles and intervals. To be more precise, each brush head fixing member 13 further includes a connecting portion 131 and a bump portion 132. The connecting portion 131 is connected to the bristle holder 11, and the bump portion 132 protrudes from the connecting portion 131 And the surface of the connecting portion 131 is flush with the surface of the bristle holder 11, however, the number of the brush head fixing portions 13 is not limited to the above, and it can also be other numbers.

In this main embodiment, each of the brush head fixing parts 13 is made of soft rubber, but the material is not limited to this. In other embodiments, the brush head fixing part 13 may also be made of other materials. The connecting portion 131 and the bump portion 132 of each brush head fixing portion 13 do not need to be made of the same material. In other words, although the connecting portion 131 and the bump portion 132 in the main embodiment are all made of soft rubber, in other implementations In an example, the user can make different materials according to his needs. For example, the connecting portion 131 is made of a hard material, and the bump portion 132 is made of a soft material.

Please refer to Figures 3, 4 and 5, in this main embodiment, since the surface of the connecting portion 131 of each brush head fixing portion 13 is aligned with the side of the bristle holder 11, the bristle holder 11 is in this main The embodiment is elliptical, so the four brush head fixing portions 13 all have an arc-shaped appearance (to match the shape of the bristle holder), but in other embodiments, if the shape of the bristle holder 11 changes, each brush head The shape of the fixing portion 13 will also be changed, which is not limited to the arc shape of the main embodiment.

Please refer to FIG. 3 and FIG. 4, in this main embodiment, the bump portion 132 of each brush head fixing portion 13 is further formed with a pushing slope 133, which is formed on a side surface of the bump portion 132 away from the bristles 12 In other words, when the brush head fixing portion 13 is disposed on the bristle holder 11, the pushing inclined surface 133 is inclined outward from the back 112 of the bristle holder 11 toward the front 111.

Please refer to Figures 1, 2 and 3, the handle 20 includes a handle 21 and a handle connecting portion 22. The handle connecting portion 22 is formed at one end of the handle 21 and the handle connecting portion 22 is used to detachably connect the aforementioned replaceable brush head 10.

More precisely, in this main embodiment, the handle connecting portion 22 includes a ring wall 221, a receiving hole 222, a pressing pad 223, and a plurality of ring wall connecting grooves 224. These elements are respectively defined below .

The ring wall 221 is arranged at one end of the handle 21 and is used to accommodate the replaceable brush head 10. Therefore, the ring wall 221 is an elliptical ring wall in this main embodiment, but in other implementations In an example, if the shape of the replaceable brush head 10 is changed, the outer shape of the ring wall 221 will also change, and the shape is not limited to an ellipse.

The receiving hole 222 is formed through the middle of the ring wall 221, and the ring wall connecting groove 224 is formed on the inner wall surface of the ring wall 221. The receiving hole 222 is used for receiving the replaceable brush head 10, which is more accurate In other words, the replaceable brush head 10 can be placed in the accommodating hole 222 and detachably combined with the ring wall connecting grooves 224 through the protrusions 132 of the brush head fixing parts 13. In other words, the main In an embodiment, the shape and number of the ring wall connecting groove 224 correspond to the shape and number of the brush head fixing members 13 of the replaceable brush head 10, so when the replaceable brush head 10 is placed in the container When placed in the hole 222, the brush head fixing members 13 can be fastened with the corresponding ring wall connecting groove 224 by the protrusion 132, so that the replaceable brush head 10 is detachably fixed in the ring wall 221.

Please refer to Figures 3 and 6, the pressing cushion 223 is connected to the inner wall surface of the ring wall 221, and when the replaceable brush head 10 is installed in the ring wall 221, the pressing cushion 223 and the back of the bristle holder 11 112 is facing each other, and the pressing cushion 223 can be squeezed to push against the replaceable brush head 10, thereby separating the replaceable brush head 10 from the handle 20, but pressing the cushion 223 is not necessary for the present invention Therefore, in other embodiments, the pressing soft pad 223 may not be provided.

The following is another embodiment of the present invention. The structure of another embodiment of the present invention is substantially the same as that of the main embodiment. However, in another embodiment of the present invention, the fixing of the brush head fixing portion 13 of the replaceable brush head 10 The features and the fastening features on the ring wall 221 of the brush handle are reversed. In other words, in another embodiment of the present invention, each brush head fixing portion 13 is provided with a connecting portion 131 and a fixing groove (not shown), The fixing groove is concavely formed on the connecting portion 131 and used for detachably combining with the brush handle 20.

On the other hand, in another embodiment of the present invention, the handle connecting portion 22 of the handle 20 is substantially the same as that of the main embodiment, but it does not have the ring wall connecting grooves, but on the ring wall connecting grooves. Correspondingly, a plurality of ring wall connecting protrusions (not shown in the figure) protruding inward are formed at corresponding positions; more precisely, the ring wall connecting protrusions are formed on the inner wall surface of the ring wall 221 and can be combined with the replaceable brush The fixing groove on the brush head fixing portion 13 of the head 10 is detachably fastened to each other, so that the replaceable brush head 10 and the brush handle 20 are detachably connected.

The following are the usage modes and advantages of the present invention, and take the main embodiments of the present invention as an example.

Please refer to Figure 1, Figure 2 and Figure 3, when the present invention is in use, it can provide users with a replaceable brush head 10, with the corresponding brush handle 20, the brush handle 20 can be repeated To replace the replaceable brush head, to be more precise, when a brush handle 20 without the replaceable brush head 10 is to be installed, the user places a replaceable brush head 10 on the back 112 The pressing cushion 223 facing the brush handle 20 is placed in the ring wall 221 of the brush handle 20, and is detachably locked between the brush head fixing portion 13 and the ring wall connecting groove 224, so that the replaceable brush head 10 It is detachably arranged in the ring wall 221, so that the replaceable brush head 10 and the handle 20 are combined into a usable toothbrush.

Please further refer to Figures 3 and 4, where, when the replaceable brush head 10 is installed, the pushing inclined surface 133 on the bump portion 132 can make the bump portion 132 easier to place on the corresponding ring wall The connecting groove 224 facilitates the ease of the entire installation process, but pushing the inclined surface 133 is not an essential feature of the present invention.

Please refer to FIG. 5, FIG. 6 and FIG. 7, and when the user wants to remove the replaceable brush head 10 installed on the brush handle 20, the user can press the cushion 223 by pressing It is indirectly pushed against the back 112 of the bristle holder 11 of the replaceable brush head 10, so that the bump portion 132 is deformed due to being squeezed, and in the process of being gradually pushed against, the bump portion 132 will move from the corresponding ring The wall connecting groove 224 is disengaged, and the replaceable brush head 10 is separated from the brush handle 20 to achieve the purpose of disassembly.

The advantage of the present invention is that by providing a replaceable brush head 10 and a corresponding brush handle 20, when the bristles 12 are used for a period of time, if they reduce or lose their cleaning function, the user can use the replaceable brush head 10 is disassembled from the brush handle 20 and replaced with a new replaceable brush head 10 to achieve the purpose of quickly replacing the bristles on the brush handle 20. In other words, the user does not need to stop every time the bristles are exhausted. Throw away the entire toothbrush, but by replacing the replaceable brush head, the same brush handle 20 can be used continuously to achieve the effect of reusing the brush handle, which can not only reduce the price of cleaning supplies for users, but also reduce the waste toothbrush Increase the degree of environmental protection.

Please refer to Figures 8 to 10, the second embodiment of the toothbrush with replaceable brush head of the present invention is substantially the same as the aforementioned first embodiment, but the brush head fixing member 13A and the bristle holder 11A are changed to be integrally formed, so the brush The head fixing part 13A has no connecting part, and the convex part 132A is formed directly on the bristle holder 11A, and then the pressing cushion 223A is directly connected to the back 112A of the bristle holder 11A. In other words, pressing the cushion 223A and replaceable The brush heads 10A are combined together, so the pressing pad 223A is also a part that is replaced together with the replaceable brush head 10A; in addition, the pressing pad 223A faces the ring wall 221A on one side protruding with an undercut part 2231A, undercut part 2231A protrudes from the accommodating hole 222A of the ring wall 221A, and the periphery of the inverted hook 2231A is hooked around the periphery of the accommodating hole 222A, so that the replaceable brush head 10A is not only coupled to the ring wall by the brush head fixing member 13A 221A, the replaceable brush head 10A is also fixed to the ring wall 221A through the undercut portion 2231A of the combined pressing pad 223A, thereby strengthening its combination and fixation.

Referring to Figures 11 and 12, the third embodiment of the toothbrush with replaceable brush head of the present invention is substantially the same as the aforementioned second embodiment, but there is a further provision between the back 112B of the bristle holder 11B and the pressing cushion 223B The purpose of the baffle 225B and the baffle 225B is that the pressing pad 223B can be directly molded on the replaceable brush head 10B by injection molding. At this time, the baffle 225B can form a barrier to avoid any flow of molten plastic . In addition, preferably, the peripheral edge of the baffle 225B may be formed with a plurality of baffle fitting portions 2251B, and the peripheral edge of the pressing pad 223B is formed with a plurality of cushion fitting portions 2232B, and the cushion fitting portions 2232B are respectively embedded Fitted to the baffle fitting portion 2251B, thereby strengthening the combination of the pressing pad 223B and the baffle 225B; in this embodiment, the baffle fitting portion 2251B is a groove and the cushion fitting portion 2232B is a convex Block, but not limited to this, and can be the opposite.

In the second and third embodiments of the present invention, the

pressing pads

223A and 223B are changed to a part of the replaceable brush heads 10A and 10B that are replaced together, so that the brush handle can also be reused to improve environmental protection The degree of the purpose of the invention.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. It is common in any technical field. The technical personnel, without departing from the scope of the technical solution of the present invention, can make use of the technical content disclosed above to make some changes or modifications as equivalent embodiments of equivalent changes, but any content that does not deviate from the technical solution of the present invention is based on The technical essence of the present invention makes any simple modifications, equivalent changes and modifications to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims

A replaceable brush head, which can be used to install on a handle of a toothbrush, the replaceable brush head includes

A bristle holder, the opposite sides of which are respectively a front and a back;

A plurality of bristles, the bristles are arranged on the front surface of the bristle seat;

At least one brush head fixing member is arranged on the bristle seat and used for detachably combining with the handle of the toothbrush.
3. The replaceable brush head of claim 1, wherein the at least one brush head fixing member comprises a connecting portion and a bump portion, the connecting portion is connected to the bristle seat, and the bump portion protrudes from the connecting portion Above, the convex part is used to detachably combine with the handle of the toothbrush.
3. The replaceable brush head according to claim 2, wherein the convex portion of the at least one brush head fixing member is formed with a pushing inclined surface formed on a side of the convex portion away from the bristles.
The replaceable brush head of claim 1, wherein the at least one brush head fixing member comprises a connecting portion and a recessed portion, the connecting portion is connected to the bristle seat, and the recessed portion is recessed on the connecting portion The recess is used for detachably combining with the handle of the toothbrush.
3. The replaceable brush head of claim 2, wherein in the at least one brush head fixing member, the surface of the connecting portion is flush with the surface of the bristle holder.
3. The replaceable brush head of claim 1, wherein the at least one brush head fixing member and the bristle holder are integrally formed.
7. The replaceable brush head of claim 6, wherein the at least one brush head fixing member comprises a convex portion protruding from the bristle seat, and the convex portion is used to interact with the brush of the toothbrush The handles are detachably combined, and a pushing inclined surface is formed on the convex portion, which is formed on a side surface of the convex portion away from the bristles.
The replaceable brush head of claim 6, further comprising

A pressing cushion is combined with the back of the bristle holder.
The replaceable brush head of claim 8, further comprising

A blocking piece is arranged between the back surface of the bristle seat and the pressing soft pad.
3. The replaceable brush head of claim 1, wherein the number of the at least one brush head fixing member is four, and the four brush head fixing members are circumferentially arranged on the periphery of the side of the bristle holder at intervals.
A toothbrush with replaceable brush head, which comprises

A brush handle, which contains

A grip

A handle connecting part, which is formed at one end of the handle part;

A replaceable brush head, which is detachably mounted on the brush handle, and the replaceable brush head includes

A bristle holder, the opposite sides of which are respectively a front and a back;

A plurality of bristles, the bristles are arranged on the front surface of the bristle seat;

At least one brush head fixing part is arranged on the bristle seat, and the handle connecting part is selectively connected with the at least one brush head fixing part.
The toothbrush with a replaceable brush head according to claim 11, wherein

The handle connecting part contains

A ring wall, which is arranged at one end of the grip portion;

A receiving hole formed in the middle of the ring wall;

The toothbrush with a replaceable brush head further includes a pressing soft pad which is connected to the inner wall surface of the ring wall and is respectively arranged on opposite sides of the ring wall with the replaceable brush head, and the pressing soft pad It can be squeezed and pushed against the replaceable brush head.
The toothbrush with a replaceable brush head according to claim 12, wherein

A side surface of the pressing cushion facing the ring wall protrudes with an undercut part, the undercut part protrudes out of the accommodating hole of the ring wall, and the periphery of the undercut part surrounds the hook in the accommodating hole Perimeter.
The toothbrush with a replaceable brush head according to claim 13, which further comprises

A blocking piece is arranged between the back surface of the bristle seat and the pressing soft pad.
The toothbrush with a replaceable brush head as claimed in claim 14, wherein a plurality of baffle fitting parts are formed on the periphery of the baffle, and a plurality of soft mat fitting parts are formed on the periphery of the pressing cushion. The cushion fitting parts are respectively fitted into the stopper fitting parts.
The toothbrush with a replaceable brush head according to claim 11, wherein

The at least one brush head fixing member of the replaceable brush head includes a connecting portion and a bump portion, the connecting portion is connected to the bristle seat, and the bump portion protrudes from the connecting portion;

The handle connecting part contains

A ring wall, which is arranged at one end of the grip portion;

An accommodating hole formed in the middle of the ring wall;

A plurality of ring wall connecting grooves, the ring wall connecting grooves are formed on the inner wall surface of the ring wall, and can be fixed with the at least one brush head fixing part of the replaceable brush head, so that the replaceable brush head The head is detachably connected with the brush handle.
The toothbrush with a replaceable brush head according to claim 11, wherein

The at least one brush head fixing member of the replaceable brush head includes a connecting portion and a groove portion, the connecting portion is connected to the bristle seat, and the groove portion is recessed on the connecting portion;

The handle connecting part contains

A ring wall, which is arranged at one end of the grip portion;

An accommodating hole formed in the middle of the ring wall;

A plurality of ring wall connecting protrusions, the ring wall connecting protrusions are protrudingly formed on the inner wall surface of the ring wall, and can be fixed with the at least one brush head fixing part of the replaceable brush head, so that the The replaceable brush head is detachably connected with the brush handle.