阅读说明：本技术 用于螺杆的铣丝设备 (Thread milling equipment for screw ) 是由 李帅 赵建国 李乃庆 李鹏 邱兴鲁 陈龙 徐殿翔 于 2019-09-20 设计创作，主要内容包括：本公开提供了一种用于螺杆的铣丝设备,铣丝设备包括机体以及设置在机体上的直线驱动装置、旋转驱动装置、套筒、铣丝装置和固定装置；固定装置用于固定目标螺杆；铣丝装置用于清理目标螺杆,并且铣丝装置设置在套筒的内侧；直线驱动装置用于驱动固定装置和套筒中的一个沿轴向移动,以使固定装置和铣丝装置相对移动；旋转驱动装置用于驱动固定装置和套筒中的至少一个转动,以使固定装置和铣丝装置发生相对转动。本公开的铣丝设备能够自动完成对目标螺杆的清理,同时还能够通过套筒将铣丝装置清理下来的铁屑进行收集,避免了铁屑掉落到地面上。因此,本公开的铣丝设备减少了人工的介入,节约了工人的时间,减少了时间成本。(The disclosure provides a wire milling device for a screw, which comprises a machine body, a linear driving device, a rotary driving device, a sleeve, a wire milling device and a fixing device, wherein the linear driving device, the rotary driving device, the sleeve, the wire milling device and the fixing device are arranged on the machine body; the fixing device is used for fixing the target screw; the wire milling device is used for cleaning the target screw and is arranged on the inner side of the sleeve; the linear driving device is used for driving one of the fixing device and the sleeve to move along the axial direction so as to enable the fixing device and the wire milling device to move relatively; the rotary driving device is used for driving at least one of the fixing device and the sleeve to rotate so as to enable the fixing device and the wire milling device to rotate relatively. The clearance to the target screw rod can be accomplished automatically to this wire milling equipment, can also collect the iron fillings that the wire milling device clearance got off through the sleeve simultaneously, has avoided iron fillings to drop subaerially. Therefore, the silk equipment of milling of this disclosure has reduced artifical intervention, has practiced thrift workman's time, has reduced the time cost.)

1. The wire milling equipment for the screw is characterized by comprising a machine body, a linear driving device, a rotary driving device, a sleeve cover, a wire milling device and a fixing device, wherein the linear driving device, the rotary driving device, the sleeve cover, the wire milling device and the fixing device are arranged on the machine body;

the fixing device is used for fixing the target screw;

the wire milling device is used for cleaning the target screw rod and is arranged on the inner side of the sleeve;

the linear driving device is used for driving one of the fixing device and the sleeve to move along the axial direction so as to enable the fixing device and the wire milling device to move relatively;

the rotary driving device is used for driving at least one of the fixing device and the sleeve to rotate so as to enable the fixing device and the wire milling device to rotate relatively;

the radial section of the inner space of the sleeve becomes gradually larger towards the fixing device;

the sleeve cover is provided with a through hole for allowing the target screw to pass through, and the sleeve cover and one end of the sleeve close to the fixing device are detachably connected together.

2. The wire milling apparatus of claim 1, wherein the interior space of the sleeve is tapered or flared.

3. The wire milling apparatus of claim 1, further comprising a brush disposed inside the sleeve and between the sleeve cover and the wire milling device, the brush for cleaning scrap iron adhering to the screw.

4. The wire milling apparatus of claim 1, further comprising a plurality of fixed links symmetrically distributed about the axis of the sleeve, a first end of each of the fixed links being connected to the sleeve and a second end of each of the fixed links being connected to the wire milling device.

5. The wire milling apparatus of claim 1 wherein the wire milling device is an annular structure having an inner side provided with an internal thread that mates with an external thread on the target screw.

6. The wire milling apparatus of any one of claims 1 to 5, wherein the linear drive is fixedly connected to the body and drivingly connected to the sleeve.

7. The wire milling apparatus of claim 6, wherein the linear drive device is an electric push rod, a housing of the electric push rod is fixedly connected with the body, and a push rod of the electric push rod is connected with the sleeve.

8. The wire milling apparatus of claim 7, wherein the rotary drive device comprises a first motor, a housing of the first motor is fixedly connected with the push rod, and a rotating shaft of the first motor is coaxially and fixedly connected with the sleeve.

9. The wire milling apparatus of claim 8, wherein the rotary drive device further comprises a second motor, a housing of the second motor is fixedly connected with the machine body, and a rotating shaft of the second motor is fixedly connected with the fixing device.

10. The wire milling apparatus of claim 9, further comprising a slide bar, wherein a middle portion of the slide bar is fixedly connected to the housing of the first motor, and two ends of the slide bar are slidably connected to the housing respectively.

Technical Field

The utility model belongs to screw rod treatment facility field specifically provides a mill silk equipment for screw rod.

Background

The screw rod often can receive external force impact at production, transportation and in-process with the use, takes place to collide with, and then leads to the external screw thread on the screw rod to take place to warp. The deformed screw is difficult to assemble with the nut, and in order to ensure the normal use of the screw, the deformed external thread needs to be processed.

The technical means that is often adopted at present is that a thread milling device with internal threads is screwed on a screw rod, so that the internal threads of the thread milling device cut off and clean deformed parts of the external threads. The hardness and the strength of the thread part on the wire milling device are better than those of the thread part on the screw, otherwise the wire milling device is easily damaged by the screw.

It should be noted that "milling" is a machining process, and specifically refers to a process of cutting metal.

At present, the screw rod is cleaned by the wire milling device, which is usually manually operated by a worker, that is, the worker is required to manually screw the wire milling device or the screw rod. And the iron fillings that produce in the milling silk process can directly drop to the ground, need the workman to clear up the iron fillings on the ground.

Disclosure of Invention

In order to solve the above problems in the prior art, that is, to solve the problem that the cleaning work of the existing screw needs manual operation, which results in higher time cost, the present disclosure provides a wire milling apparatus for a screw, which includes a machine body, and a linear driving device, a rotary driving device, a sleeve cover, a wire milling device and a fixing device, which are arranged on the machine body; the fixing device is used for fixing the target screw; the wire milling device is used for cleaning the target screw rod and is arranged on the inner side of the sleeve; the linear driving device is used for driving one of the fixing device and the sleeve to move along the axial direction so as to enable the fixing device and the wire milling device to move relatively; the rotary driving device is used for driving at least one of the fixing device and the sleeve to rotate so as to enable the fixing device and the wire milling device to rotate relatively; the radial section of the inner space of the sleeve becomes gradually larger towards the fixing device; the sleeve cover is provided with a through hole for allowing the target screw to pass through, and the sleeve cover and one end of the sleeve close to the fixing device are detachably connected together.

Optionally, the interior space of the sleeve is conical or flared.

Optionally, the wire milling device further comprises a brush, the brush is arranged on the inner side of the sleeve and located between the sleeve cover and the wire milling device, and the brush is used for cleaning scrap iron attached to the screw rod.

Optionally, the wire milling device further includes a plurality of fixed connecting rods symmetrically distributed around the axis of the sleeve, a first end of each of the fixed connecting rods is connected to the sleeve, and a second end of each of the fixed connecting rods is connected to the wire milling device.

Optionally, the wire milling device is of an annular structure, and an internal thread matched with the external thread on the target screw is arranged on the inner side of the annular structure.

Optionally, the linear driving device is fixedly connected with the machine body and is in driving connection with the sleeve.

Optionally, the linear driving device is an electric push rod, a housing of the electric push rod is fixedly connected with the machine body, and a push rod of the electric push rod is connected with the sleeve.

Optionally, the rotation driving device includes a first motor, a housing of the first motor is fixedly connected to the push rod, and a rotating shaft of the first motor is coaxially and fixedly connected to the sleeve.

Optionally, the rotation driving device further includes a second motor, a housing of the second motor is fixedly connected to the machine body, and a rotating shaft of the second motor is fixedly connected to the fixing device.

Optionally, the wire milling device further includes a sliding rod, a middle portion of the sliding rod is fixedly connected with the housing of the first motor, and two ends of the sliding rod are slidably connected with the machine body respectively.

As can be understood by those skilled in the art, in the above technical solution of the present disclosure, a target screw is fixed by a fixing device, the target screw is cleaned by a wire milling device, and the wire milling device is disposed inside the sleeve, so that the sleeve can receive waste wires cleaned by the wire milling device; through the drive of sharp drive arrangement fixing device with one in the sleeve is along axial displacement, so that fixing device with mill a device relative movement, through the drive of rotary drive device fixing device with at least one in the sleeve rotates, so that fixing device with mill a device and take place relative rotation for this disclosed mills a equipment and can accomplish the clearance to the target screw rod automatically, can also pass through simultaneously the sleeve will mill iron fillings that a device cleared up and get off and collect, avoided iron fillings to drop subaerially. Therefore, the silk equipment of milling of this disclosure has reduced artifical intervention, has practiced thrift workman's time, has reduced the time cost.

Further, in the above technical solution of the present disclosure, by setting the radial cross section of the inner space of the sleeve to be a form gradually becoming larger toward the fixing device, and detachably connecting the sleeve cover and one end of the sleeve close to the fixing device together, the iron pieces inside the sleeve can slide down to the end of the sleeve with a larger diameter under the action of gravity and be blocked by the sleeve cover. When the iron chips need to be cleaned, the iron chips on the sleeve can automatically slide down under the action of gravity only by opening the sleeve cover. Not only is convenient for cleaning the scrap iron, but also prevents the scrap iron from falling off by itself in the working process of the milling equipment.

Drawings

Fig. 1 is a front view of a wire milling apparatus in a first embodiment of the present disclosure;

fig. 2 is a top view of a wire milling apparatus in a first embodiment of the present disclosure;

FIG. 3 is an isometric view of a fixture of the wire milling apparatus in a first embodiment of the present disclosure;

FIG. 4 is an isometric view of a sleeve portion of a first embodiment of the wire milling apparatus of the present disclosure;

FIG. 5 is a side view of a sleeve portion of a first embodiment of a wire milling apparatus according to the present disclosure;

FIG. 6 is an isometric view of a sleeve portion (with a sleeve cover) of a second embodiment of a wire milling apparatus according to the present disclosure;

FIG. 7 is a front view of a sleeve portion (with a sleeve cover) of a second embodiment of a wire milling apparatus according to the present disclosure;

FIG. 8 is a cross-sectional view taken along A-A of FIG. 7;

FIG. 9 is an isometric view of a sleeve portion (without a sleeve cover) of a wire milling apparatus according to a second embodiment of the present disclosure;

FIG. 10 is a side view of a sleeve portion (without a sleeve cover) of a second embodiment of a wire milling apparatus according to the present disclosure;

FIG. 11 is a schematic view of a state of the second embodiment of the disclosure in the process of milling the wire by the wire milling device;

fig. 12 is a front view of a brush of a wire milling apparatus in a third embodiment of the present disclosure;

fig. 13 is a schematic view of a state of the wire milling device in the process of milling the wire in the third embodiment of the disclosure.

List of reference numerals:

1. a body; 2. an electric push rod; 3. a first motor; 4. a sleeve; 5. a wire milling device; 6. a second motor; 7. a fixing device; 71. a fixed base; 711. mounting holes; 72. a bolt; 8. a screw; 9. a slide bar; 10. fixing the connecting rod; 11. a sleeve cover; 111. a through hole; 12. a brush; 121. a brush body; 122. brushing; 13. scrap iron.

Detailed Description

Technical solutions of some embodiments of the present disclosure will be clearly and completely described below with reference to the drawings provided in the present disclosure, and it is obvious that the embodiments described below are only some embodiments of the present disclosure, and not all embodiments. All other embodiments that can be derived by a person of ordinary skill in the art based on the embodiments of the disclosure without inventive faculty should still fall within the scope of the disclosure.

It should be noted that in the description of the present disclosure, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as appropriate.

The first embodiment of the present disclosure is specifically as follows:

as shown in fig. 1 and 2, in the first embodiment of the present disclosure, a wire milling apparatus for a screw mainly includes a body 1, an electric push rod 2 as a linear driving means, a first motor 3 as a rotational driving means, a sleeve 4, a wire milling means 5, a second motor 6 as a rotational driving means, and a fixing means 7. Wherein, the casing (not marked in the figure) of the electric push rod 2 is fixedly connected with the left end of the machine body 1 in fig. 1, the push rod (not marked in the figure) of the electric push rod 2 is fixedly connected with the casing of the first motor 3, the rotating shaft of the first motor 3 is coaxially and fixedly connected with the sleeve 4, and the wire milling device 5 is fixedly installed in the sleeve 4. A housing (not shown) of the second motor 6 is fixedly connected with the right end of the machine body 1 in fig. 1, a rotating shaft of the second motor 6 is fixedly connected with the fixing device 7, and a rotating axis of the fixing device 7 is coaxial with a rotating axis of the wire milling device 5, in other words, the first motor 3, the sleeve 4 and the second motor 6 are coaxial with each other.

Further, the electric push rod 2 is used for driving the first motor 3, the sleeve 4 and the wire milling device 5 to be close to or far away from the fixing device 7, the first motor 3 is used for driving the sleeve 4 and the wire milling device 5 to rotate, the second motor 6 is used for driving the fixing device 7 to rotate, and the fixing device 7 is used for fixing a target screw (such as a screw 8 shown in fig. 1 and 2).

Although not explicitly shown in the drawings, the machine body 1 mainly includes a left side plate, a right side plate, and a connection beam, wherein the connection beam is disposed between the left side plate and the right side plate, and two ends of the connection beam are fixedly connected to the left side plate and the right side plate, respectively. What the left side board was connected is electric push rod 2, what the right side board was connected is second motor 6 to electric push rod 2, first motor 3, sleeve 4, mill a device 5, second motor 6 and fixing device 7 all are located between left side board and the right side board.

It will be understood by those skilled in the art that, in the case of being able to drive the first motor 3, the sleeve 4 and the milling unit 5 in a linear motion, the electric push rod 2 may also be replaced by any other feasible linear drive means, such as a cylinder or an air cylinder. In this regard, those skilled in the art can substitute the electric putter 2 appropriately according to the actual usage, but the technical solution after the modification does not deviate from the technical principle and the inventive concept of the present embodiment, and thus, it still falls within the protection scope of the present disclosure.

As shown in fig. 1 and 2, since the first motor 3 has a large weight, in order to prevent the first motor 3 from being displaced in the vertical direction (up-down direction in fig. 1) by the self-weight, the wire milling apparatus of the present embodiment optionally further includes a slide bar 9. The middle part of the sliding rod 9 is fixedly connected with the shell of the first motor 3, and the two ends of the sliding rod 9 are connected with the machine body 1 in a sliding way. Specifically, two ends of the sliding rod 9 are respectively provided with a pulley (not labeled in the figure), and the pulleys are in rolling contact with the connecting beam of the machine body 1, so that the sliding rod 9 can move along the length direction of the connecting beam under the support of the pulleys.

As shown in fig. 3, the fixing device 7 of the present embodiment mainly includes a fixing base 71 and a bolt 72. Wherein, the fixing base 71 is provided with a mounting hole 711, the mounting hole is used for accommodating a caliper, the caliper is used for fixing the screw 8, and one end of the fixing base 71 far away from the mounting hole 711 is fixedly connected with the rotating shaft of the second motor 6. The fixing base 71 has a flat surface (not shown) formed thereon, and the fixing base 71 has a screw hole (not shown) formed therein and communicating with the mounting hole 711 so that the bolt 72 can be inserted into the mounting hole 711 from the screw hole to abut against the caliper to fasten the caliper to the mounting hole 711. It will be appreciated by those skilled in the art that the caliper may be any feasible caliper, such as a U-shaped section iron block, a C-shaped section iron block, two symmetrical C-shaped iron blocks, etc., where the screw 8 can be secured in the mounting hole 711. Alternatively, according to actual needs, a person skilled in the art may directly insert the screw 8 into the mounting hole 711 without using a caliper, and fix the screw 8 into the mounting hole 711 by the bolt 72, so that the screw 8 and the fixing device 7 are coaxially fixed together.

As shown in fig. 4 and 5, the wire milling apparatus of the present embodiment further includes four fixing links 10, a first end of each fixing link 10 is fixedly connected to the sleeve 4, and a second end of each fixing link 10 is fixedly connected to the wire milling device 5. In addition, the number of the fixed links 10 may be set to any other number, such as two, three, five, six, etc., as needed by those skilled in the art.

Although not shown in the drawings, in an alternative embodiment of the present embodiment, the fixing link 10 is a bolt (or a screw), and the circumferential wall of the sleeve 4 is provided with four threaded holes matching with the bolt. During the fixing of the milling device 5 to the sleeve 4: the bolts are first screwed into said threaded holes, the milling device 5 is then placed into the sleeve 4, and the tightening of the bolts is continued until each bolt abuts against the milling device 5 and is tightened against the sleeve 4, at which point the milling device 5 is bolted into the sleeve 4.

Although not shown in the drawings, in another alternative embodiment of the present embodiment, the fixed link 10 is fixedly connected or integrated with the wire milling device 5, wherein the fixed connection may be welding, fusing, screwing, or the like. The end of the fixing link 10 remote from the milling thread device 5 is provided with an external thread and the inside of the sleeve 4 is provided with an internal thread which engages with the external thread, the milling thread device 5 and the sleeve 4 being fixed together when the fixing link 10 and the milling thread device 5 are screwed together into the sleeve 4 and tightened. Alternatively, the fixing link 10 may be fixedly connected to or integrally formed with the sleeve 4 as required by those skilled in the art, and an internal thread is provided at an end of the fixing link 10 away from the sleeve 4, and an external thread engaged with the internal thread is provided at an outer side of the wire milling device 5.

Although not explicitly shown in the drawings, the inner side of the thread milling device 5 is provided with an internal thread matched with the screw 8, and the strength of the internal thread is greater than that of the external thread on the screw 8, so that the thread milling device can smoothly remove (mill) the deformed part of the thread on the screw 8. The thread milling device 5 can be any feasible and internally threaded component, such as a nut, a die, a thread cutter, etc., for this purpose.

The working principle of the wire milling device of the present embodiment is briefly described below with reference to fig. 1 and 2.

As shown in fig. 1 and 2, the push rod of the electric push rod 2 is in a retracted state before the start of the milling (cleaning of the screw). The operator first mounts the screw 8 to the caliper and then mounts the caliper and the screw 8 together to the fixture 7. Subsequently, the first motor 3 and the second motor 6 rotate in opposite directions (for example, the first motor 3 rotates in the forward direction, and the second motor 6 rotates in the reverse direction), and the electric push rod 2 drives the first motor 3 and the sleeve 4 to move towards the second motor 6, so that the screw 8 is inserted into the wire milling device 5, and the wire milling device 5 cleans the screw 8. After the screw 8 is cleaned, the first motor 3 and the second motor 6 rotate in opposite directions (the first motor 3 rotates reversely, the second motor 6 rotates positively), and the electric push rod 2 starts to retract.

It should be noted that, when the first motor 3 and the second motor 6 rotate relatively for one turn, the length of the electric push rod 21 is the width of one thread on the screw 8, so as to ensure that the screw 8 can be cleaned normally. It should also be noted that, in order to clean the entire screw 8, the axial length of the portion of the sleeve 4 between the milling device 5 and the first motor 3 is greater than or equal to the length of the screw 8. Further optionally, the sleeve 4 is also arranged to allow insertion of the fixture 7, so that the milling device 5 can clean the portion of the screw 8 close to the fixture 7.

Further, it is also possible for those skilled in the art to rotate only one of the first motor 3 and the second motor 6, while the other motor does not rotate, as necessary. Based on this, the skilled person can omit the arrangement of the first motor 3 or the second motor 6 and only reserve one motor according to the actual requirement.

Based on the above description, those skilled in the art can understand that the wire milling device in the first embodiment of the present disclosure can automatically complete the wire milling operation of the screw 8, and meanwhile, the wire milling device is disposed inside the sleeve 4, so that the sleeve 4 can accommodate iron filings milled down, the iron filings are prevented from falling onto the ground, and the time cost for manually milling wires and collecting the iron filings is saved.

The second embodiment of the present disclosure is specifically as follows:

as shown in fig. 6 to 11, the second embodiment differs from the first embodiment only in the structure of the sleeve 4, and the second embodiment is further added with a sleeve cover 11 on the basis of the first embodiment. For convenience of description, only the differences between the second embodiment and the first embodiment will be described in detail below, and the parts of the second embodiment that are the same as the parts of the first embodiment will not be described correspondingly.

As shown in fig. 6 to 8, the sleeve 4 is a tapered sleeve, and the smaller diameter end of the sleeve 4 is fixedly connected to the rotating shaft of the first motor 3, and the larger diameter end of the sleeve 4 is detachably connected to the sleeve cover 5. It will be appreciated by those skilled in the art that the connection between the sleeve 4 and the sleeve cap 5 may be any other feasible connection such as a threaded connection, a snap connection, a screw connection, etc. In order to allow the screw 8 to be smoothly inserted into the sleeve 4, the sleeve cover 11 is provided with a through hole 111. Further optionally, the diameter of the through hole 111 is larger than the diameter of the fixing device 7, so that the thread milling device 5 can clean the portion of the screw 8 close to the fixing device 7.

As shown in fig. 8 to 11, the radial section of the inner space of the sleeve 4 in fig. 8 is sequentially enlarged from top to bottom, so that when the sleeve 4 is horizontally placed, the iron pieces 13 in the sleeve 4 can slide down to the end with the larger diameter of the sleeve 4 under the action of self gravity and are blocked by the sleeve cover 5, and the iron pieces 13 are prevented from sliding out of the sleeve 4. When the iron chips 13 need to be cleaned, the iron chips on the sleeve 4 can automatically slide down under the action of gravity only by opening the sleeve cover 5. If a part of the iron pieces 13 still adheres to the sleeve 4, the iron pieces 13 can be cleaned out by the brush.

Based on the above description, those skilled in the art can understand that the wire milling device in the second embodiment of the present disclosure not only can automatically complete the wire milling operation on the screw 8, but also facilitates the cleaning of the scrap iron 13 by the worker, and further saves the time cost compared with the wire milling device in the first embodiment.

In addition, in the case of ensuring that the radial cross section of the inner space of the sleeve 4 becomes gradually larger, those skilled in the art may set the inner space of the sleeve 4 to be a flare shape, and set the shape of the sleeve 4 (the outer shape of the sleeve 4) to be a flare shape or a cylindrical shape.

The third embodiment of the present disclosure is specifically as follows:

as shown in fig. 12 and 13, the third embodiment is different from the second embodiment only in that a brush 12 is further added to the second embodiment. For convenience of description, only the differences between the third embodiment and the second embodiment will be described in detail below, and the same parts between the third embodiment and the second embodiment will not be described correspondingly.

As shown in fig. 12, the brush 12 mainly includes a brush body 121 and bristles 122. The brush body 121 has a circular ring structure, and the brush bristles 122 are uniformly arranged on the inner circumferential surface of the brush body 121.

As shown in fig. 13, the brush 12 is disposed inside the sleeve 4 and between the milling unit 5 and the sleeve cover 11. It will be appreciated by those skilled in the art that the brush 12 may be secured with the sleeve 4 in any feasible manner. Optionally, the brush 12 is also fixed together with the sleeve 4 by means of the fixed link 10.

With continued reference to fig. 13, the brush 12 is used to clean the scrap iron 13 attached to the screw 8. Specifically, when the screw 8 moves away from the sleeve 4, the brush 12 rotates relative to the screw 8, and the iron pieces 13 attached to the screw 8 are cleaned by the brush hairs.

Based on the above description, it can be understood by those skilled in the art that the third embodiment of the present disclosure can also clean the iron pieces 13 attached to the screw 8 by the brush 12, compared to the second embodiment.

Further, the brush 12 may be provided in any other feasible form as required by those skilled in the art, and illustratively, the brush body 121 is provided in a semi-annular shape, and the bristles 122 are uniformly arranged on the circumferential surface of the inner side of the brush body 121; alternatively, the brush body 121 is formed in a square shape, and the brush staples 122 are uniformly arranged on the inner surface of the brush body 121.

Finally, the term "coaxial" as used in this disclosure means that the plurality of rotational axes are identical or coincide with each other. The rotation axis refers to an axis line which is located at the center of a rotation track of a certain member when the member rotates.

So far, the technical solution of the present disclosure has been described in connection with the embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present disclosure is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features may be made by those skilled in the art without departing from the technical principles of the present disclosure, and any changes, equivalents, improvements and the like made within the technical concept and/or technical principles of the present disclosure will fall within the protective scope of the present disclosure.