CN114852008B - Dustproof coiler - Google Patents

Abstract

The application discloses dustproof coiler includes: the device comprises a main body bracket, a mandrel, a dustproof part and a positioning structure; two opposite side walls of the main body support are provided with accommodating through holes, and the end parts of the mandrel are limited in the accommodating through holes; the dustproof parts are arranged on two side walls of the main body bracket, cover the accommodating through holes and are provided with packaging structures matched with the end parts of the mandrel, and the packaging structures are buckled on the end parts of the mandrel; the positioning structure surrounds the accommodating through hole and is arranged between the dustproof part and the main body bracket, and is used for positioning the packaging structure on two side walls of the bracket main body and forming a mandrel rotation gap between the packaging structure and the end part of the mandrel. This application covers the holding through-hole through the dustproof part that sets up, and has played dustproof effect under the pivoted prerequisite that does not influence the dabber. In addition, the dustproof part of the embodiment has a simple structure, and is installed without influencing the original space of the retractor, so that the space utilization rate of the retractor is improved.

Description

Dustproof coiler

Technical Field

The application relates to the technical field of automobile equipment, in particular to a dustproof retractor.

Background

Retractors are important automotive safety devices that function in conjunction with a safety webbing to secure a person to a seat during a crash to reduce the likelihood of injury.

A typical retractor is generally composed of a main body bracket, a mandrel, a locking assembly and a coil spring assembly, but the connection between the components is relatively complex, so that a certain gap exists between the components after the components are connected, and impurities such as dust can enter the retractor through the gap. Particularly in some environments with more dust, such as mountain off-road and beach, the overall environment has more dust, which can easily enter the interior of the retractor, thereby affecting the normal use of the retractor.

Therefore, how to improve the dust-proof effect of the retractor is a problem to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the application provides a dustproof coiler to solve the problem of how to promote the dustproof effect of coiler among the prior art.

The embodiment of the application provides a dustproof coiler, includes: the device comprises a main body bracket and a mandrel, wherein two opposite side walls of the main body bracket are provided with accommodating through holes, and the end parts of the mandrel are limited in the accommodating through holes; characterized by comprising the following steps: a dust-proof member and a positioning structure;

the dustproof parts are arranged on two side walls of the main body bracket, cover the accommodating through holes and are provided with packaging structures matched with the end parts of the mandrels, and the packaging structures are buckled on the end parts of the mandrels;

the positioning structure surrounds the accommodating through hole and is arranged between the dustproof part and the main body support, and the positioning structure is used for positioning the packaging structure on two side walls of the support main body and forming a mandrel rotation gap between the packaging structure and the end part of the mandrel.

Optionally, the end of the mandrel is the end of the mandrel located on the inner surfaces of the two side walls of the main body bracket, and the dust-proof component is arranged on the inner surfaces of the two side walls of the main body bracket;

the main body of the dustproof part is in an offset flat ring shape, the packaging structure is arranged at a position close to the ring center and surrounds the ring center, and is in a protruding shape relative to the main body of the dustproof part in the circumferential direction of the mandrel, and the protruding shape is a structure matched with the end part of the mandrel.

Optionally, the ends of the mandrel on the inner surfaces of the two side walls of the main body support are in a positive step structure, and the bulge matched with the ends of the mandrel is in a reverse step structure.

Optionally, the outer end surface forming the reverse step structure is provided as an inclined surface.

Optionally, the positioning structure comprises a first positioning hole, a second positioning hole and a positioning pin;

the first positioning holes are arranged on two side walls of the main body bracket around the accommodating through holes according to a preset distance, and the preset distance enables the positioning structure to form a mandrel rotation gap between the packaging structure and the end part of the mandrel;

the second positioning hole is opposite to the first positioning hole and is arranged on the main body of the dustproof part;

the positioning pin penetrates through the first positioning hole and the second positioning hole so as to position the dustproof part on two side walls of the bracket main body.

Optionally, the main body of the dustproof part comprises two half-ring bodies with the same structure, and the two half-ring bodies are spliced through the positioning structure to form the main body of the dustproof part.

Optionally, the method further comprises: a dust cover and a fastening structure;

the dustproof cover is provided with a structure matched with the appearance of the main body bracket, and is buckled on the main body bracket;

the fixing structure is arranged between the dust cover and the main body support and is used for fixedly mounting the dust cover on the main body support.

Optionally, the end of the mandrel is the end of the mandrel located on the outer surface of the side wall of the main body support, and the dust-proof component is arranged on the outer surfaces of the two side walls of the main body support;

the main body of the dustproof part is in a flat annular shape, the packaging structure is arranged at a position close to the ring center and surrounds the ring center, the main body of the dustproof part is in a convex shape in the radial direction of the mandrel, and a rotating gap for enabling the mandrel to rotate is formed between the packaging structure and the circumferential end face of the end part of the mandrel.

Optionally, the method further comprises: the coil spring assembly comprises a coil Huang Gai and a coil spring seat, wherein the coil Huang Gai and the coil spring seat are assembled in a reverse buckling mode, and an inclined plane is arranged at the buckling position.

Optionally, the method further comprises: the locking assembly comprises a locking bottom plate and a locking cover;

the middle boss of the locking bottom plate is matched with the outer ring surface of the end part of the mandrel to form a clearance surface;

the locking boss of the locking bottom plate and the groove of the locking cover are assembled in an embedded mode, and the edge of the locking bottom plate and the locking cover are assembled in a sealing mode.

Compared with the prior art, the application has the following advantages:

the embodiment of the application provides a dustproof coiler, includes: the device comprises a main body bracket, a mandrel, a dustproof part and a positioning structure; two opposite side walls of the main body support are provided with accommodating through holes, and the end parts of the mandrels are limited in the accommodating through holes; the dustproof parts are arranged on two side walls of the main body bracket, cover the accommodating through holes and are provided with packaging structures matched with the end parts of the mandrels, and the packaging structures are buckled on the end parts of the mandrels; the positioning structure surrounds the accommodating through hole and is arranged between the dustproof part and the main body support, and the positioning structure is used for positioning the packaging structure on two side walls of the support main body and forming a mandrel rotation gap between the packaging structure and the end part of the mandrel. According to the embodiment of the application, the accommodating through hole is covered by the dustproof part, and the dustproof effect is achieved on the premise that rotation of the mandrel is not affected. In addition, the dustproof part of the embodiment has a simple structure, and is installed without influencing the original space of the retractor, so that the space utilization rate of the retractor is improved.

Drawings

Fig. 1 is a schematic structural diagram of a dust-proof retractor according to an embodiment of the present application.

Fig. 2 is an exploded view of the dust collector provided in the embodiment of the present application.

Fig. 3 is an assembly schematic diagram of a main body bracket and a dust-proof component according to an embodiment of the present application.

Fig. 4 is an assembly schematic diagram of a dust-proof component provided in an embodiment of the present application assembled to a mandrel and a body support.

Fig. 5 is an enlarged view at a in fig. 2.

Fig. 6 is a schematic structural view of a dust-proof member provided in an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a dust cover according to an embodiment of the present application.

Reference numerals: the dust-proof retractor 100, the main body bracket 1, the accommodating through hole 11, the side wall 12, the mandrel 2, the end 21, the dust-proof component 3, the main body 31, the packaging structure 32, the positioning structure 4, the first positioning hole 41, the positioning pin 42, the dust cover 5, the fixing structure 6, the expansion pin 61, the shaft pin 62, the first pin hole 63, the second pin hole 64, the coil spring assembly 7, the coil Huang Gai 71, the coil spring seat 72, the locking assembly 8, the locking bottom plate 81, the locking cover 82, the ratchet assembly 83 and the vehicle sensing assembly 84.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present application. The embodiments of the present application may be embodied in many other forms other than those described herein and similarly generalized by those skilled in the art may be made without departing from the spirit of the embodiments of the present application and the embodiments of the present application are therefore not limited to the specific implementations disclosed below.

An embodiment of the present application provides a dust-proof retractor, and fig. 1 is a schematic structural diagram of the dust-proof retractor provided in the embodiment of the present application. Fig. 2 is an exploded view of the dust collector provided in the embodiment of the present application. Fig. 3 is an assembly schematic diagram of a main body bracket and a dust-proof component according to an embodiment of the present application. Fig. 4 is an assembly schematic diagram of a dust-proof component provided in an embodiment of the present application assembled to a mandrel and a body support. Fig. 5 is an enlarged view at a in fig. 2. Fig. 6 is a schematic structural view of a dust-proof member provided in an embodiment of the present application. Fig. 7 is a schematic structural diagram of a dust cover according to an embodiment of the present application.

The embodiment of the application provides a dustproof retractor 100, which comprises: a main body bracket 1, a mandrel 2, a dust-proof component 3 and a positioning structure 4. Wherein the main body bracket 1 is a supporting body 31 of the entire dust retractor 100, and other parts of the dust retractor 100 are assembled by the main body bracket 1 to form the complete dust retractor 100. For example, the other components include a locking assembly 8 and a coil spring assembly 7, and as shown in fig. 1 and 2, the main body holder 1 is integrally formed in a frame structure in a lateral direction, the main body holder 1 has opposite side walls 12, and receiving through holes 11 for defining end portions 21 of the spindle 2 are provided on the opposite side walls 12, the spindle 2 is located in an inner space of the main body holder 1, and the end portions 21 of the spindle 2 are defined in the receiving through holes 11. The locking assembly 8 is located on the right side wall 12 of the body bracket 1 and the coil spring assembly 7 is located on the left side wall 12 of the body bracket 1. The locking assembly 8 includes a locking bottom plate 81, a ratchet assembly 83, a vehicle sensing assembly 84, and a locking cover 82, and based on that each component in the locking assembly 8 is a conventional component, the specific connection manner of each component will not be described herein. The coil spring assembly 7 includes a coil spring cover, a coil spring, and a coil spring seat 72. Based on the fact that the various components of the coil spring assembly 7 are conventional, the specific manner in which the components are connected will not be described in detail herein.

In this embodiment, after the end 21 of the mandrel 2 is assembled in the accommodating through hole 11, in order to maintain the rotation of the end 21 of the mandrel 2, the end 21 of the mandrel 2 is not in a sealed state with the accommodating through hole 11, that is, a gap is formed between the end 21 of the mandrel 2 and the accommodating through hole 11, so that some fine impurities such as dust and liquid enter into the locking component 8 on the right side wall 12 and the coil spring component 7 on the left side wall 12 through the gap, and further the normal use and the service life of the dust collector 100 are affected. To avoid this, as shown in fig. 1 to 7, the present embodiment is provided with dust-proof members 3, the dust-proof members 3 are disposed on two side walls 12 of the main body bracket 1, the dust-proof members 3 are covered on the accommodating through holes 11, and have a packaging structure 32 matched with the end 21 of the mandrel 2, and the packaging structure 32 is fastened to the end 21 of the mandrel 2. Specifically, the end 21 of the mandrel 2 may be the end 21 of the mandrel 2 located on the inner surfaces of the two side walls 12 of the main body support 1, and the dust-proof component 3 is correspondingly disposed on the inner surfaces of the two side walls 12 of the main body support 1, where the dust-proof component 3 has a packaging structure 32 matched with the end 21 of the mandrel 2 disposed on the inner surfaces of the two side walls 12 of the main body support 1, and the packaging structure 32 is fastened to the end 21 of the mandrel 2 located on the inner surfaces of the two side walls 12 of the main body support 1. Of course, the end 21 of the mandrel 2 may be the end 21 of the mandrel 2 located on the outer surfaces of the two side walls 12 of the main body bracket 1, and the dust-proof component 3 may be disposed on the outer surfaces of the two side walls 12 of the main body bracket 1, and the dust-proof component 3 may have a packaging structure 32 matching the end 21 of the mandrel 2 disposed on the outer surfaces of the two side walls 12 of the main body bracket 1, and the packaging structure 32 may be fastened to the end 21 of the mandrel 2 located on the outer surfaces of the two side walls 12 of the main body bracket 1. The specific structure of the dust-proof member 3 located on the inner and outer surfaces of the both side walls 12 of the main body bracket 1 will be described below, respectively.

Specifically, the end portions 21 of the spindle 2 are the end portions 21 of the spindle 2 located on the inner surfaces of the both side walls 12 of the main body bracket 1, the end portions 21 of the both ends of the spindle 2 have the same structure, the dust-proof members 3 are provided on the inner surfaces of the both side walls 12 of the main body bracket 1, and the dust-proof members 3 located on the end portions 21 of the both ends of the spindle 2 have the same structure. The main body 31 of the dust-proof member 3 is in a flat annular shape, and the package structure 32 is disposed at a position close to and surrounding the ring center, and is convex in the circumferential direction of the mandrel 2 with respect to the main body 31 of the dust-proof member 3. Wherein the body 31 of the dust-proof member 3 is arranged in an offset ring shape in order to reduce the occupation of the inner space of the body holder 1, and in order to have a central opening which can be fitted with the end 21 of the spindle 2, i.e. the dust-proof member 3 is fitted with the end 21 of the spindle 2. The encapsulation structure 32 is located near and around the core and is convex with respect to the main body 31 of the dust-proof member 3, the convex being a structure that matches the end 21 of the spindle 2. And the height of the protrusion is slightly higher than the thickness of the end 21 of the mandrel 2 in order to encapsulate the end 21 of the mandrel 2 while minimizing the space occupied in the interior of the body support 1. Further, the end portions 21 of the spindle 2 located on the inner surfaces of the side walls 12 of the main body bracket 1 are in a positive step structure, and the protrusions matched with the end portions 21 of the spindle 2 are arranged in a reverse step structure. In addition, the outer end face forming the reverse step structure is provided with an inclined surface, and the outer end face of the reverse step structure is provided with the inclined surface, so that impurities such as dust falling on the outer end face of the reverse step structure can be separated from the outer end face of the reverse step structure.

After the dust-proof component 3 is sleeved on the end 21 of the mandrel 2, in order not to affect the normal rotation of the end 21 of the mandrel 2, the dust-proof component 3 needs to be sleeved on the designated position of the end 21 of the mandrel 2, and in this embodiment, the dust-proof component 3 is sleeved on the designated position of the end 21 of the mandrel 2 through the set positioning structure 4. Specifically, the positioning structure 4 is disposed between the dust-proof component 3 and the main body bracket 1 around the accommodating through hole 11, and is used for positioning the packaging structure 32 on both side walls 12 of the bracket main body 31, and forming a spindle 2 rotation gap between the packaging structure 32 and the end 21 of the spindle 2.

Further, in the embodiment of the present application, the positioning structure 4 includes a first positioning hole 41, a second positioning hole and a positioning pin 42. The first positioning holes 41 are provided around the receiving through holes 11 at both side walls 12 of the main body bracket 1 at a predetermined distance such that the positioning structure 4 forms a spindle 2 rotation gap between the package structure 32 and the end 21 of the spindle 2, the predetermined distance being determined after calculation and measurement. The second positioning hole is opposite to the first positioning hole 41 and is provided in the main body 31 of the dust-proof member 3, and the positioning pin 42 penetrates the first positioning hole 41 and the second positioning hole to position the dust-proof member 3 on the inner surfaces of both side walls 12 of the holder main body 31. Wherein, location structure 4 encircles holding through-hole 11 interval setting, and location structure 4 sets up to two at least, and location structure 4 of this embodiment is 90 degrees setting with adjacent interval angle, and the quantity of location structure 4 sets up to four.

In this embodiment, in order to facilitate sleeving the dust-proof component 3 on the end 21 of the mandrel 2, the dust-proof component 3 may be configured as two half-rings with identical structures, that is, the main body 31 of the dust-proof component 3 includes two half-rings with identical structures, and the two half-rings are spliced to form the main body 31 of the dust-proof component 3 through the positioning structure 4. Specifically, when the dust-proof component 3 is configured as two half-rings with the same structure, one half-ring may be first sleeved on a half of the peripheral wall of the end 21 of the mandrel 2, and the half-ring may be positioned between the packaging structure 32 and the end 21 of the mandrel 2 by the positioning structure 4 according to a predetermined distance. Then, another half ring is fitted over the other half peripheral wall of the end 21 of the mandrel 2, and is positioned between the encapsulation 32 and the end 21 of the mandrel 2 by the positioning structure 4 at a predetermined distance. After the two half-rings are combined, a convex packaging structure 32 can be formed.

The above is a specific structure in which the dust-proof member 3 is located on the inner surfaces of the both side walls 12 of the main body holder 1, and a specific structure (not shown) in which the dust-proof member 3 is located on the outer surfaces of the both side walls 12 of the main body holder 1 will be described below. Specifically, the end 21 of the spindle 2 is the end 21 of the spindle 2 located on the outer surface of the side wall 12 of the main body support 1, the end 21 of the two ends of the spindle 2 is of a different structure, the dustproof part 3 is arranged on the outer surfaces of the two side walls 12 of the main body support 1 and covers the accommodating through hole 11, the main body 31 of the dustproof part 3 is in a flat annular shape, the packaging structure 32 is arranged at a position close to the annular center and surrounds the annular center, the main body 31 of the dustproof part 3 is in a convex shape in the radial direction of the spindle 2, a rotating gap for enabling the spindle 2 to rotate is formed between the packaging structure 32 and the circumferential end surface of the end 21 of the spindle 2, the gap is the smallest in size on the premise that the rotation of the spindle 2 is not affected, and therefore dust can be effectively prevented from entering into mechanisms on two sides of the main body support 1 from the gap. Wherein the body 31 of the dust-proof member 3 is arranged in a flat annular shape in order to reduce the occupation of the internal space of the mechanism on both sides of the body holder 1, and in order to have a central opening which can be fitted with the end 21 of the spindle 2, i.e. the dust-proof member 3 is fitted with the end 21 of the spindle 2.

After the dust-proof component 3 is sleeved on the end 21 of the mandrel 2, in order not to affect the normal rotation of the end 21 of the mandrel 2, the dust-proof component 3 needs to be sleeved on the designated position of the end 21 of the mandrel 2, and in this embodiment, the dust-proof component 3 is sleeved on the designated position of the end 21 of the mandrel 2 through the set positioning structure 4. Specifically, the positioning structure 4 is disposed between the dust-proof component 3 and the main body bracket 1 around the accommodating through hole 11, and is used for positioning the packaging structure 32 on both side walls 12 of the bracket main body 31, and forming a spindle 2 rotation gap between the packaging structure 32 and the end 21 of the spindle 2. The specific structure of the positioning structure 4 can be referred to above, and the detailed description will not be repeated here.

In addition, in order to further prevent dust and other impurities from entering the coil spring assembly 7, the coil Huang Gai and the coil spring seat 72 are assembled in an inverted buckle shape, and an inclined plane is arranged at the buckling position, so that dust and other impurities can be effectively prevented from entering the coil spring assembly. Similarly, in order to further prevent impurities such as dust from entering the locking assembly 8, in this embodiment, the middle boss of the locking bottom plate 81 is matched with the outer ring surface of the end 21 of the mandrel 2 to form a clearance surface, and the locking boss of the locking bottom plate 81 and the groove of the locking cover 82 are assembled in an embedded manner, and edges of the locking cover 82 and the locking bottom plate 81 are assembled in a closed manner, so that impurities such as dust can be effectively prevented from entering the locking assembly 8. Particularly in environments where there is a lot of dust, dust is better prevented from entering the dust retractor 100.

In addition, in the embodiment of the present application, in order to further prevent foreign substances such as dust from entering into the inner space of the main body holder 1, a dust cover 5 and a securing structure 6 are also provided. The dust cover 5 has a structure matching with the outer shape of the main body bracket 1, and the dust cover 5 is buckled on the main body bracket 1. The fixing structure 6 is arranged between the dust cover 5 and the main body bracket 1 and is used for fixing and sealing the dust cover 5 on the main body bracket 1. The whole of dust cover 5 is U type structure, and solid dress structure 6 sets up in the border position of U type structure respectively, and as shown in fig. 7, solid dress structure 6 sets up at the front end and the rear end of U type structure. The fixing structure 6 includes a tension pin 61, a shaft pin 62, a first pin hole 63, and a second pin hole 64, the tension pin 61 being provided at the front end of the dust cover 5, the first pin hole 63 being opposite to the tension pin 61 and being provided on the bottom wall of the main body bracket 1. A shaft pin 62 is provided at the rear end of the dust cover 5, and specifically, on the inner surface of the rear end of the dust cover 5, and a second pin hole 64 is provided opposite to the shaft pin 62 and on the main body bracket 1. The expansion pin 61 is inserted into the first pin hole 63 in the vertical direction, and the shaft pin 62 is inserted into the second pin hole 64 in the horizontal direction, thereby fixing the dust cover 5 on the main body bracket 1.

Embodiments of the present application provide a dust collector 100, comprising: a main body bracket 1, a mandrel 2, a dustproof part 3 and a positioning structure 4; two opposite side walls 12 of the main body bracket 1 are provided with accommodating through holes 11, and the end 21 of the mandrel 2 is limited by the accommodating through holes 11; the dustproof parts 3 are arranged on two side walls 12 of the main body bracket 1, the dustproof parts 3 are covered on the accommodating through holes 11 and are provided with packaging structures 32 matched with the end parts 21 of the mandrels 2, and the packaging structures 32 are buckled on the end parts 21 of the mandrels 2; the positioning structure 4 is arranged between the dustproof part 3 and the main body bracket 1 around the accommodating through hole 11, and is used for positioning the packaging structure 32 on the two side walls 12 of the bracket main body 31 and forming a mandrel 2 rotation gap between the packaging structure 32 and the end part 21 of the mandrel 2. The dustproof part 3 that this application embodiment through setting up covers holding through-hole 11, and has played dustproof effect under the prerequisite that does not influence the rotation of dabber 2. In addition, the dustproof part 3 of the embodiment has a simple structure, and is installed without affecting the original space of the retractor, so that the space utilization rate of the retractor is improved.

While the preferred embodiment has been described, it is not intended to limit the invention thereto, and any person skilled in the art may make variations and modifications without departing from the spirit and scope of the present invention, so that the scope of the present invention shall be defined by the claims of the present application.

Claims (8)

1. A dust-proof retractor comprising: the device comprises a main body bracket and a mandrel, wherein two opposite side walls of the main body bracket are provided with accommodating through holes, and the end parts of the mandrel are limited in the accommodating through holes; characterized by comprising the following steps: a dust-proof member and a positioning structure;

the dustproof parts are arranged on two side walls of the main body support, the dustproof parts cover the accommodating through holes and are provided with packaging structures matched with the end parts of the mandrels, the packaging structures are buckled on the end parts of the mandrels, the main bodies of the dustproof parts are in convex shapes in the circumferential direction of the mandrels, the end parts of the mandrels positioned on the inner surfaces of the two side walls of the main body support are in positive step structures, the convex shapes matched with the end parts of the mandrels are in reverse step structures, and the outer end surfaces forming the reverse step structures are inclined slopes;

the positioning structure surrounds the accommodating through hole and is arranged between the dustproof part and the main body support, and the positioning structure is used for positioning the packaging structure on two side walls of the main body support and forming a mandrel rotation gap between the packaging structure and the end part of the mandrel.

2. The dust retractor of claim 1, wherein the end of the spindle is the end of the spindle on the inner surface of the two side walls of the main body bracket, and the dust-proof member is disposed on the inner surface of the two side walls of the main body bracket; the main body of the dustproof part is in a flat annular shape, and the packaging structure is arranged at a position close to the ring center and surrounds the ring center.

3. The dust retractor of claim 1, wherein said locating structure comprises a first locating hole, a second locating hole, and a locating pin;

the first positioning holes are arranged on two side walls of the main body bracket around the accommodating through holes according to a preset distance, and the preset distance enables the positioning structure to form a mandrel rotation gap between the packaging structure and the end part of the mandrel;

the second positioning hole is opposite to the first positioning hole and is arranged on the main body of the dustproof part;

the positioning pin penetrates through the first positioning hole and the second positioning hole so as to position the dustproof part on two side walls of the main body support.

4. A dust collector according to any one of claims 2 to 3 wherein the main body of the dust-proof component comprises two half-rings of identical construction and the two half-rings are spliced by the locating structure to form the main body of the dust-proof component.

5. The dust retractor of claim 1, further comprising: a dust cover and a fastening structure;

the dustproof cover is provided with a structure matched with the appearance of the main body bracket, and is buckled on the main body bracket;

the fixing structure is arranged between the dust cover and the main body support and is used for fixedly mounting the dust cover on the main body support.

6. The dust retractor of claim 1, wherein the end of the spindle is the end of the spindle on the outer surface of the side walls of the main body bracket, and the dust-proof member is disposed on the outer surfaces of the side walls of the main body bracket;

the main body of the dustproof part is in a flat annular shape, the packaging structure is arranged at a position close to the ring center and surrounds the ring center, the main body of the dustproof part is in a convex shape in the radial direction of the mandrel, and a rotating gap for enabling the mandrel to rotate is formed between the packaging structure and the circumferential end face of the end part of the mandrel.

7. The dust retractor of claim 1, further comprising: the coil spring assembly comprises a coil spring cover and a coil spring seat, wherein the coil spring cover and the coil spring seat are assembled in a reverse buckling mode, and an inclined plane is arranged at the buckling position.

8. The dust retractor of claim 1, further comprising: the locking assembly comprises a locking bottom plate and a locking cover;

the middle boss of the locking bottom plate is matched with the outer ring surface of the end part of the mandrel to form a clearance surface;

the locking boss of the locking bottom plate and the groove of the locking cover are assembled in an embedded mode, and the edge of the locking bottom plate and the locking cover are assembled in a sealing mode.

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