CN214478294U - Wire rewinding device - Google Patents

Abstract

The utility model provides a wire-rewinding device, which comprises a shell and a wire-winding mechanism, wherein the wire-winding mechanism comprises a first part and a second part which are superposed, the first part is fixed relative to the shell, and the second part can rotate relative to the first part; the first portion mounts a first conductor for electrical connection to a first cable and electrically connectable to a first external device through the first cable; the second portion is mounted with a second conductor for electrical connection to a second cable and being electrically connectable to a second external device via the second cable, the second cable being windable to the second portion; a cavity is formed between the first part and the second part, a flexible conductive piece is arranged in the cavity, the first conductor is electrically connected with the initial end of the flexible conductive piece, and the second conductor is electrically connected with the terminal end of the flexible conductive piece. The utility model discloses when being applied to and taking in data line or charging wire, certain tip of data line or charging wire can keep fixed, another tip can stretch out and draw back convenient to use.

Description

Wire rewinding device

[ technical field ] A method for producing a semiconductor device

The utility model relates to a spooler is particularly useful for accomodating electrically conductive cable, for example charging wire or data line.

[ background of the invention ]

The conventional data line spooler includes a housing and a spooling mechanism provided in the housing, and the spooling mechanism is rotatable with respect to the housing. The center of the data line is mounted to the winding mechanism, and the remaining two portions are wound around the winding mechanism in the same winding direction. When a user pulls the two ends of the data wire, the wire winding mechanism rotates so as to synchronously pull out the two ends of the data wire; when the user looses his hand, the winding mechanism rotates in the opposite direction under the action of the return spring, so that the two ends of the data wire are synchronously retracted. The two ends of the data wire are synchronously pulled out and synchronously retracted, so that the positions of the wire rewinding device relative to the two ends of the data wire are changed, and inconvenience is brought to use. A wire rewinding device in which one end of a data wire is fixed and the other end is retractable is desired in the market.

[ Utility model ] content

The utility model discloses a main aim at provides a spooler, when being applied to and accomodate data line or charging wire, certain tip of data line or charging wire can keep fixed, another tip can stretch out and draw back convenient to use.

In order to achieve the above object, the present invention provides a wire winding device, including a housing and a wire winding mechanism, wherein the wire winding mechanism includes a first portion and a second portion that are stacked, the first portion is fixed relative to the housing, and the second portion is rotatable relative to the first portion; the first portion mounts a first conductor for electrical connection to a first cable and is electrically connectable to a first external device through the first cable; the second portion mounting a second conductor for electrical connection to a second cable and being electrically connectable to a second external device via the second cable, the second cable windable to the second portion; a cavity is formed between the first part and the second part, a flexible conductive piece is arranged in the cavity, the first conductor is electrically connected with the initial end of the flexible conductive piece, and the second conductor is electrically connected with the terminal end of the flexible conductive piece.

Preferably, the flexible conductive member is a flat FPC or a flat cable.

As a preferable technical solution, the flexible conductive member is wound around a central axis and then received in the cavity.

Preferably, the housing comprises a first half shell and a second half shell which are fastened together, and the first part is integrated with the first half shell.

As a preferable technical solution, the first conductor and the second conductor are both sheet-shaped; the first conductor is fixed to an inner wall of the first half shell; the second conductor is fixed to the second portion; the first conductor and the second conductor are respectively positioned at two axial ends of the cavity.

As a preferred technical solution, the wire rewinding device includes the central shaft disposed in the housing, and the central shaft is fixed to at least one of the first half shell and the second half shell; the second portion includes a drum fitted to an outer periphery of the center shaft, the drum being rotatable about the center shaft, and a coil spring disposed within the drum, the coil spring being disposed about the center shaft, an initial end of the coil spring being fixed to the center shaft, and a final end of the coil spring being fixed to the drum.

Preferably, the central shaft includes a shaft sleeve and a shaft rod, one of the shaft sleeve and the shaft rod is fixed to the first half-shell, the other of the shaft sleeve and the shaft rod is fixed to the second half-shell, and the shaft rod is inserted into the shaft sleeve.

As a preferable technical solution, a first wire hole and a second wire hole are provided on the outer side of the housing, through which a first cable connected to the first conductor and a second cable connected to the second conductor pass, respectively.

As a preferred technical solution, the wire rewinding device further comprises a stopping structure for maintaining the rotation angle of the second portion, wherein the stopping structure comprises a sliding slot provided to the second half shell, a stopping slide slidable in the sliding slot, and a guide slot provided to the second portion; the sliding block body is arranged in the sliding groove and can slide in the sliding groove, so that the distance between the stopping part and the rotating center of the second part is variable; the guide groove comprises an inner guide groove, an outer guide groove surrounding the inner guide groove, a first cutting groove and a second cutting groove, and the first cutting groove and the second cutting groove are respectively communicated with the outer guide groove and the inner guide groove at a first position and a second position so that the stop part can be switched between the outer guide groove and the inner guide groove; the second cutout groove is provided with a positioning recess portion which is restricted from sliding when the stopper portion slides into the positioning recess portion so as to maintain the rotation angle of the second portion

As a preferable technical solution, an end surface of the second portion facing the second half shell is provided with an annular cut-out convex body, a wedge-shaped convex body and an annular boss, the annular boss is arranged at a rotation center position of the second portion, and the annular cut-out convex body and the wedge-shaped convex body are arranged around the annular boss; the outer guide grooves are formed on the outer sides of the circular cutting-shaped convex bodies and the wedge-shaped convex bodies, and the inner guide grooves are formed between the inner sides of the circular cutting-shaped convex bodies and the wedge-shaped convex bodies and the outer sides of the annular bosses; the first cutting groove is formed between the first end of the wedge-shaped convex body and the annular cutting convex body, the second cutting groove is formed between the second end of the wedge-shaped convex body and the annular cutting convex body, and the second end of the wedge-shaped convex body forms the positioning concave part.

The utility model provides a spooler, when the data line is accomodate in the actual use, this first cable is the first part of data line, and this second cable is the second part of data line, and the length of first part is fixed, and the length of second part is adjustable, consequently only needs the length that the one end of keeping away from the first part of tensile data line's second part can adjust the data line, convenient to use. And two parts of the data line are electrically connected through the first conductor, the flexible conductive piece and the second conductor of the wire rewinding device, so that the data transmission requirement is met, meanwhile, in the process of stretching the data line, the flexible conductive piece and the second conductor can be always electrically connected with the second part of the data line, the conditions of oxidation and sparking cannot occur, the equipment cannot be damaged, and the use is safe.

[ description of the drawings ]

To further disclose the specific technical content of the present disclosure, please refer to the attached drawings, wherein:

fig. 1 is a schematic structural view of a wire rewinding device according to an embodiment of the present invention;

FIG. 2 and FIG. 3 are exploded views of the wire rewinding device shown in FIG. 1

FIG. 4 is a schematic structural view of a second portion and a first half of the wire takeup device shown in FIG. 1;

fig. 5 is a schematic structural view of a stopping slide and a second half shell of the wire rewinding device shown in fig. 1.

Description of the symbols:

wire rewinding device 10

First shell half 12a of outer shell 12

Second half shell 12b chute 1202

Limiting block 1204

Cavity 122 through slot 1222

First wire aperture 124 and second wire aperture 126

First portion 132 second portion 134

Flexible conductive member 14 first conductor 16

Bushing 222 for second conductor 18

Shaft 224 drum 24

The annular cut projections 242 have wedge projections 244

Positioning concave part 2442

Outer guide groove 248 of annular boss 246

Inner guide 249 first cut groove 230

Second slot 232 projection 234

Coil spring 26 stop slide 28

Stop 284 for slide body 282

Groove 286

First fastener 29a and second fastener 29b

First part 32 of data line 30

First wire body 322 first connector 324

Second part 34 second wire 342

Second connector 344

[ detailed description ] embodiments

Referring to fig. 1 to 3, the present embodiment provides a wire rewinding device 10, wherein the wire rewinding device 10 is applied to receive a data wire 30. It is understood that the spooler can also be applied to a charging cord, etc. The spooler 10 includes a housing 12 and a spooling mechanism.

The housing 12 includes a first housing half 12a and a second housing half 12b that snap together. The wire winding mechanism includes a first portion 132 and a second portion 134 which are superposed, and the second portion 134 includes a drum 24 fitted to the outer periphery of the central shaft and a coil spring 26 provided inside the drum 24. . The first portion 132 is fixed relative to the first half-shell 12 a. In this embodiment, the first portion 132 is integrally formed with the first housing half 12a, with the first portion 132 serving as a bottom portion within the first housing half 12 a. The second portion 134 is rotatable relative to the first portion 132. The first portion 132 is mounted with a first conductor 16 by a first fastener 29a (see fig. 2), the first conductor 16 being for electrical connection to a first cable and being electrically connectable to a first external device through the first cable. The second portion 134 is mounted with a second conductor 18 by a second fastener 29b (see fig. 3), the second conductor 18 being for electrical connection to a second cable and being electrically connectable to a second external device through the second cable, which may be wound around the second portion 134. The first external device and the second external device may be external electronic devices. When the wire rewinding device 10 of the present invention is applied to the data wire 30, the first cable is the first part 32 of the data wire 30, and the second cable is the second part 34 of the data wire 30. The first member 32 includes a first wire body 322, and a first connector 324 connected to the first wire body 322, and the first conductor 16 may be electrically connected with the first wire body 322. The second member 34 includes a second wire body 342 and a second connector 344 connected to the second wire body 342. The second conductor 18 may be electrically connected with the second wire 342, and the second wire 342 may be wound around the second portion 134.

The first portion 132 and the second portion 134 form a cavity 122 therebetween, and in the present embodiment, the cavity 122 is disposed to the first portion 132. A flexible conductive member 14 is disposed within cavity 122, with first conductor 16 electrically connected to an initial end of flexible conductive member 14 and second conductor 18 electrically connected to a terminal end of flexible conductive member 14. As second portion 134 rotates relative to first portion 132 to effect expansion and contraction of second portion 134 of data line 30, flexible conductive member 14 is crimped or relaxed, securing the electrical connection of first portion 32 and second portion 34 of data line 30. With this configuration, when actually used to house the data line 30, the length of the first member 32 of the data line 30 is fixed, and the connector 324 and the wire rewinding device 100 are fixed; the length of the second part 34 of the data line 30 is adjustable for ease of use. The first part 32 and the second part 34 are electrically connected through the first conductor 16, the flexible conductive member 14 and the second conductor 18, so that the data transmission requirement is met. Meanwhile, in the process of stretching the data line 30, the flexible conductive piece 14 and the second conductor 18 can always keep the electrical connection with the first part 32 and the second part 34 of the data line 30, and the conditions of oxidation and sparking can not occur depending on fixed physical connection, so that the equipment can not be damaged, and the use is safe.

A first conductor 16 is fixed to the inner wall of the first half-shell 12 a. The second conductor 18 is secured to the second portion 134. The first conductor 16 and the second conductor 18 are located at both axial ends of the cavity 122, respectively.

Specifically, in this embodiment, first conductor 16 is welded at one end to the initial end of flexible conductive member 14 and at the other end to the inner wall of first housing half 12a through slot 1222 (see fig. 2) of cavity 122. First wire body 322 of first component 32 may be welded to an end of first conductor 16 distal from flexible conductive member 14. Second conductor 18 has one end welded to the terminal end of flexible conductive member 14 and the other end secured to the end of second portion 134 proximate cavity 122 by second fastener 29 b. Second wire 342 of second component 34 may be soldered to an end of second conductor 18 distal from flexible conductive member 14.

The wire rewinding device 10 further includes a central shaft disposed in the housing 12, and the central shaft is fixed to at least one of the first half-shell 12a and the second half-shell 12 b. Drum 24 of second portion 134 is rotatable about a central axis and is positioned above chamber 122, and second conductor 18 is secured to an end of drum 24 proximate chamber 122. The second cable is wound around the outer periphery of the drum 24, and when the data wire 30 is actually stored, the second wire body 342 of the data wire 30 is wound around the outer periphery of the drum 24. The coil spring 26 of the second portion 134 is disposed about a central axis, with an initial end of the coil spring 26 secured to the central axis and a terminal end of the coil spring 26 secured to the drum 24. Coil spring 26 is used to store kinetic energy to effect repositioning of drum 24.

Flexible conductive member 14 is wound around the central axis and received in cavity 122 such that flexible conductive member 14 has a planar helical shape. According to the spiral characteristic of the flexible conductive element 14, during the process of pulling out the second part 34 of the data line 30 for a certain length, the coil spring 26 is in a compressed state, the inner diameter of each circle of the flexible conductive element 14 is correspondingly reduced under the rotation of the drum 24 and the second conductor 18 when the terminal end of the flexible conductive element 14 is driven by the rotation of the drum 24 and the second conductor 18, when the second part 34 of the data line 30 is loosened, the inner diameter of each circle of the flexible conductive element 14 is correspondingly increased to the initial inner diameter under the rotation of the drum 24 and the second conductor 18 when the second part 34 of the data line 30 is retracted to the initial position under the reset action of the coil spring 26, and thus, the stretching operation of the first part 32 of the data line 30 can be ensured.

In this embodiment, the central shaft includes a hub 222 and a shaft 224. A bushing 222 is fixedly disposed at the bottom inside the cavity 122, a shaft 224 is fixedly disposed at the bottom inside the second half-shell 12b, and the shaft 224 is inserted into the bushing 222. The initial end of the coil spring 26 is secured to the shaft 224. Flexible conductive member 14 is wound about hub 222. Cavity 122 and boss 222 confine flexible conductive member 14.

In other embodiments, shaft sleeve 222 may be fixedly disposed at the bottom of second housing half 12b, shaft 224 may be fixedly disposed at the bottom of cavity 122, and flexible conductive element 14 is wound around shaft 224. The initial end of the coil spring 26 is secured to the boss 222. Alternatively, one of the sleeve 222 and the shaft 224 may be fixedly disposed.

Preferably, the flexible conductive member 14 is a flat FPC or flat ribbon cable, which is convenient for winding. The first conductor 16 and the second conductor 18 are both in sheet shapes, and can ensure stable connection with the flexible conductive member 14, the first cable and the second cable. The planes of the first conductor 16 and the second conductor 18 are parallel, and the disc body formed by winding the flexible conductor 14 is positioned between the two planes of the first conductor 16 and the second conductor 18.

In this embodiment, a first wire hole 124 and a second wire hole 126 are formed on the outer side of the housing 12, through which a first cable connected to the first conductor 16 and a second cable connected to the second conductor 18 pass, respectively. First and second wire holes 124 and 126 are provided at the junction of the first and second half shells 12a and 12b, respectively.

Referring to fig. 2 to 5, the wire rewinding device 10 further has a function of positioning the stretched length of the second cable. When actually used to store the data cable 30, the second member 34 has a function of positioning the extended length thereof, so that the user can pull out the second member 34 to an appropriate length for use.

Specifically, the wire rewinding device 100 further comprises a stopping structure for maintaining the rotation angle of the second portion 134, so as to realize the positioning function. The stop structure includes a slide slot 1202, a stop slide 28 and a guide slot.

The stopper slide 28 includes a slide body 282 having a race track shape, and a stopper 284 formed at a first end of the slide body 282. The stop 284 projects from a face of the slide body 282 adjacent the second portion 134. The stopper 284 has a columnar shape. The bottom of the second half 12b is provided with a sliding slot 1202 matching with the sliding body 282, as shown in fig. 3 and 5, the sliding slot 1202 surrounds the connection between the shaft 224 and the second half 12b, the sliding body 282 is disposed in the sliding slot 1202 and can slide in the sliding slot 1202 along the length direction of the sliding slot 1202, so that the distance between the stopper 284 and the shaft 224 can be changed, even if the distance between the stopper 284 and the rotation center of the second part 134 is changed. The slide body 282 is fitted around the shaft 224 of the center shaft. The bottom of the sliding slot 1202 is provided with a limit block 1204 at one side of the shaft 224 of the central shaft, as shown in fig. 3 and 5, the limit block 1204 is located at the outer side of the first end of the slider body 282 for limiting the sliding distance of the slider body 282 between the limit block 1204 and the shaft 224 of the central shaft. When the first end of the slider body 282 abuts the stopper 1204, the inner side of the second end of the slider body 282 abuts the shaft 224 of the center shaft, as shown in fig. 5.

Preferably, a groove 286 is formed in the center of the outer side of the first end of the slide body 282, the limit block 1204 is matched with the groove 286, and the limit block 1204 can be matched with the groove 286 to limit the slide body 282 conveniently.

As shown in fig. 4, the end face of drum 24 of second portion 134 facing second half-shell 12b is provided with said guide grooves. The stop 284 is inserted into the guide slot, and the rotation of the second portion 134 drives the stop 284 to move in the guide slot, and the stop 284 drives the sliding body 282 to slide in the sliding slot 1202.

The guide grooves include an inner guide groove 249, an outer guide groove 248 surrounding the inner guide groove 249, a first cut groove 230, and a second cut groove 232. The first cutout groove 230 and the second cutout groove 232 communicate with the outer guide groove 248 and the inner guide groove 249 in the first position and the second position, respectively, so that the stopper 284 can be switched between the outer guide groove 248 and the inner guide groove 249 even if the stopper 284 can enter the outer guide groove 248 or the inner guide groove 249 through the first cutout groove 230 or the second cutout groove 232. The second cutout groove 232 is provided with a positioning concave portion 2442.

The end face of drum 24 of second portion 134 facing second half-shell 12b is provided with a more than semi-circular annular cutout boss 242, a wedge-shaped boss 244 and an annular boss 246. An annular boss 246 is provided at a central position of drum 24, and circular cut projections 242, wedge projections 244 are provided around annular boss 246. The outer sides of the circular cut protrusion 242 and the wedge protrusion 244 form the outer guide groove 248, and the inner sides of the circular cut protrusion 242 and the wedge protrusion 244 form the inner guide groove 249, so that the bottoms of the outer guide groove 248 and the inner guide groove 249 are coplanar, so that the stopper 284 moves in the guide groove with little sound, thereby eliminating sound interference. The end of drum 24 distal from first portion 132 in fig. 2 does not show the annular protrusions 242, wedge protrusions 244, annular boss 246, outer guide grooves 248, and inner guide grooves 249. The first undercut 230 is formed between a first end of the wedge-shaped protrusion 244 and the annular-cut protrusion 242, and the second undercut 232 is formed between a second end of the wedge-shaped protrusion 244 and the annular-cut protrusion 242. The second end of the wedge-shaped protrusion 244 is provided with the positioning concave portion 2442 for the locking position of the stopper 284, and the positioning concave portion 2442 is located between the outer guide groove 248 and the inner guide groove 249. The stopper 284 is restricted from sliding when sliding into the positioning recess 2442 to maintain the rotational angle of the second portion 134. The inner wall of the outer guide groove 248 is provided with a protrusion 234 at a position corresponding to the first cut groove 230.

When actually applied to the data wire 30, when the second member 34 is wound around the drum 24 and the stopper 284 is caught at the positioning recess 2442, i.e., the initial state, the stopper 284 is located at the maximum distance from the drum 24, and therefore, the initial state of the stopper 284 is located in the outer guide groove 248. When the second member 34 is stretched, the second portion 134 is rotated, the stop 284 rotates counterclockwise in the outer guide groove 248 shown in fig. 4, when the stop 284 moves counterclockwise from the outer guide groove 248 to the protrusion 234, the stop 284 is moved from the first incision groove 230 to the inner guide groove 249 under the guidance of the protrusion 234, and then the stop 284 moves counterclockwise in the inner guide groove 249, so that the second member 34 is in a stretched state.

In the process of stretching the second component 34, when the second component 34 is pulled and released, at this time, under the action of the elastic force of the coil spring 26, the second component 34 will be reversed, so that the stop part 284 rotates clockwise in the inner guide groove 249, and the stop part 284 will be clamped at the positioning concave part 2442 under the guidance of the circular-cut-shaped convex body 242, thereby positioning the stretched length of the second component 34, so that the user can pull out the second component 34 to a proper length, and the use requirement is met.

After stopping, when the second member 34 is pulled again, if the pulling distance is long, the stopping part 284 is firstly separated from the positioning concave part 2442 and enters the outer guide groove 248, when the stopping part 284 is relatively moved from the outer guide groove 248 to the convex part 234 in the counterclockwise direction, the stopping part 284 is led to enter the inner guide groove 249 from the first incised groove 230 under the guidance of the convex part 234, then the stopping part 284 is always moved in the counterclockwise direction in the inner guide groove 249 until the second member 34 is stopped being pulled and the second member 34 is released, at this time, the stopping part 284 is clamped at the positioning concave part 2442 under the elastic force of the coil spring 26, and thus the stretched length of the second member 34 is repositioned.

After stopping, when the second member 34 is pulled again, if the pulling distance is short, the stopping part 284 is disengaged from the positioning concave part 2442 and moves along the counterclockwise direction in the outer guide groove 248, and does not enter the inner guide groove 249, when the second member 34 is pulled and the second member 34 is released, the stopping part 284 is always moved along the clockwise direction in the outer guide groove 248 under the action of the elastic force of the coil spring 26, namely, the automatic wire-rewinding state is realized, until the coil spring 26 returns to the initial state, the second member 34 is wound on the drum 24, and the stopping part 284 is clamped at the positioning concave part 2442, so that the initial state is realized.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A wire-rewinding device comprises a shell and a wire-winding mechanism, and is characterized in that,

the reeling mechanism comprises a first part and a second part which are overlapped, wherein the first part is fixed relative to the shell, and the second part can rotate relative to the first part; the first portion mounts a first conductor for electrical connection to a first cable and is electrically connectable to a first external device through the first cable; the second portion mounting a second conductor for electrical connection to a second cable and being electrically connectable to a second external device via the second cable, the second cable windable to the second portion;

a cavity is formed between the first part and the second part, a flexible conductive piece is arranged in the cavity, the first conductor is electrically connected with the initial end of the flexible conductive piece, and the second conductor is electrically connected with the terminal end of the flexible conductive piece.

2. The spooler of claim 1, wherein said flexible conductive member is a flat FPC or a flat ribbon cable.

3. The wire rewinding device as claimed in claim 2, wherein said flexible conductive member is housed in said cavity after being wound around a central axis.

4. The spooler of claim 3, wherein said housing comprises a first half shell and a second half shell snapped together, said first portion being integral with said first half shell.

5. The spooler of claim 4, wherein said first conductor and said second conductor are both sheet-like; the first conductor is fixed to an inner wall of the first half shell; the second conductor is fixed to the second portion; the first conductor and the second conductor are respectively positioned at two axial ends of the cavity.

6. The wire spooler of claim 4, wherein the wire spooler comprises the central shaft disposed within the housing, the central shaft being fixed with at least one of the first half shell and the second half shell; the second portion includes a drum fitted to an outer periphery of the center shaft, the drum being rotatable about the center shaft, and a coil spring disposed within the drum, the coil spring being disposed about the center shaft, an initial end of the coil spring being fixed to the center shaft, and a final end of the coil spring being fixed to the drum.

7. A spooler according to claim 6, wherein said central shaft comprises a hub and a shaft, one of said hub and shaft being fixed to said first half-shell and the other of said hub and shaft being fixed to said second half-shell, said shaft being inserted into said hub.

8. The wire rewinding device as claimed in claim 1, wherein a first wire hole and a second wire hole are formed on an outer side of the housing for passing a first cable connected to the first conductor and a second cable connected to the second conductor, respectively.

9. The wire spooler of claim 4, further comprising a stopping structure for maintaining a rotation angle of the second portion, the stopping structure comprising a slide slot provided to the second half shell, a stopping slide slidable within the slide slot, and a guide slot provided at the second portion; the sliding block body is arranged in the sliding groove and can slide in the sliding groove, so that the distance between the stopping part and the rotating center of the second part is variable; the guide groove comprises an inner guide groove, an outer guide groove surrounding the inner guide groove, a first cutting groove and a second cutting groove, and the first cutting groove and the second cutting groove are respectively communicated with the outer guide groove and the inner guide groove at a first position and a second position so that the stop part can be switched between the outer guide groove and the inner guide groove; the second cutout groove is provided with a positioning recess portion which is restricted from sliding when the stopper portion slides into the positioning recess portion so as to maintain the rotation angle of the second portion.

10. The wire rewinding device according to claim 9, wherein an end surface of said second section facing said second half-shell is provided with an annular projection, a wedge-shaped projection and an annular projection, said annular projection being arranged at a central position of rotation of said second section, said annular projection and said wedge-shaped projection being arranged around said annular projection; the outer guide grooves are formed on the outer sides of the circular cutting-shaped convex bodies and the wedge-shaped convex bodies, and the inner guide grooves are formed between the inner sides of the circular cutting-shaped convex bodies and the wedge-shaped convex bodies and the outer sides of the annular bosses; the first cutting groove is formed between the first end of the wedge-shaped convex body and the annular cutting convex body, the second cutting groove is formed between the second end of the wedge-shaped convex body and the annular cutting convex body, and the second end of the wedge-shaped convex body forms the positioning concave part.

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