A detachable fastener

Abstract

A detachable fastener includes a fastening cylinder and a fastening pin. The fastening cylinder includes a cylindrical portion and a stop head. The stop head is provided with at least two separation grooves. The stop head has a stop ring arranged at the end of the cylindrical portion and extending along the central axis of the cylindrical portion. The fastening pin includes a stop section. The stop section has at least one groove for clamping the stop ring. The groove has a contact surface for contacting the stop surface. The contact surface has a profile line which forms an angle with the central axis of the fastening cylinder smaller than the angle between the profile line of the stop surface and the central axis of the fastening cylinder, so that the stop surface and the contact surface are in line contact. The detachable fastener is used in such a way that the stop surface and the contact surface are in line contact instead of surface contact, so that the detachable fastener is achieved.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a detachable fastener. Background Technology

[0002] In automobile manufacturing, a wide variety of fasteners are used to connect or clamp two or more parts together, such as clamping and fixing curtain airbags or interior trim to the vehicle frame. Different parts or different locations require different fasteners.

[0003] As people's living standards continue to improve, cars have gradually become a daily means of transportation, resulting in a huge annual production volume of automobiles and an even greater quantity of fasteners used. The quality of these fasteners is crucial, as loosening during long-term use can cause abnormal noises in a car. If they fall off, it's even more unacceptable, as this could lead to accidents. Therefore, durability, tightness of connection, and water resistance are essential considerations in fastener design.

[0004] Furthermore, some parts of a car are disassembled frequently, such as bumpers. Therefore, fasteners used in these locations need to have good repeated disassembly and assembly performance without affecting the reliability of the connection. To avoid wear or damage caused by frequent disassembly and assembly, wear-resistant materials or surface treatments are usually used to enhance the service life of fasteners. In addition, to improve assembly efficiency, some fasteners are designed with quick-installation and quick-release structures, reducing assembly time and labor intensity. At the same time, for components with high aesthetic requirements, such as bumpers, fasteners also need to consider aesthetics, avoiding exposure or affecting the overall design. In summary, automotive fasteners not only need to meet basic connection functions, but also need to meet higher requirements in terms of durability, reliability, assembly efficiency, and appearance. Summary of the Invention

[0005] In view of this, the present invention provides a detachable fastener that can solve the above problems.

[0006] A detachable fastener for connecting a first mounted component and a second mounted component, the first mounted component having a mounting hole. The detachable fastener includes a fastening sleeve and a fastening pin inserted into the fastening sleeve. The fastening sleeve includes a cylindrical portion comprising a cylindrical body and a push-off head disposed at one end of the cylindrical body. The push-off head also has at least two dividing grooves. The push-off head has a push-off ring disposed at the end of the cylindrical body and extending along the central axis of the cylindrical body. The push-off ring has a push-off surface. In a cross-section along the central axis of the fastening sleeve, the push-off surface and the central axis of the fastening sleeve form an acute angle. The fastening pin includes a push-off section. The push-off section has at least one groove for engaging the push-off ring. In a cross-section along the central axis of the fastening sleeve, the groove has a contact surface that abuts against the push-off surface. On a cross-section along the central axis of the fastening cylinder, the outline of the abutment surface forms an acute angle with the central axis of the fastening cylinder. The angle between the outline of the abutment surface and the central axis of the fastening cylinder is smaller than the angle between the outline of the top surface and the central axis of the fastening cylinder, such that the top surface and the abutment surface are in line contact.

[0007] Furthermore, the fastening cylinder also includes a sealing portion fitted onto the cylindrical portion, the sealing portion including a covering and fixing portion covering the sealing ring mounting portion, a sealing ring disposed on the side facing the snap-fit ​​portion, and a waterproof ring covering the inner wall of the cylinder.

[0008] Furthermore, the sealing ring is provided with a groove to form an outer protrusion ring and an inner protrusion ring. In the cross section along the central axis of the fastening cylinder, the length of the outer protrusion ring along the central axis is greater than the length of the inner protrusion ring, and the extension direction of the outer protrusion ring extends away from the central axis, while the extension direction of the inner protrusion ring extends closer to the central axis.

[0009] Furthermore, the fastening cylinder also includes a sealing ring mounting portion disposed at the other end of the cylinder body, and at least two snap-fit ​​portions disposed at the waist of the cylinder body.

[0010] Furthermore, the snap-fit ​​portion includes a window formed on the cylinder body, and a snap-fit ​​connector disposed in the window body. The snap-fit ​​connector includes a guide surface facing away from the central axis of the cylinder body, a snap-fit ​​guide surface facing the sealing ring mounting portion, and a snap-fit ​​surface connected to the snap-fit ​​guide surface and facing the sealing ring mounting portion.

[0011] Furthermore, in the free state, the snap-fit ​​connector extends out of the window, meaning that the maximum outer diameter of the snap-fit ​​connector is greater than the outer diameter of the cylinder.

[0012] Furthermore, in a cross-section along the central axis of the fastening cylinder, the outline of the guide surface has an acute angle with the central axis of the fastening cylinder, and the guide surface extends toward the sealing ring mounting portion. The snap-fit ​​guide surface has an acute angle with the central axis of the fastening cylinder, and the snap-fit ​​guide surface extends away from the sealing ring mounting portion. The snap-fit ​​surface is perpendicular to the central axis of the fastening cylinder to facilitate snap-fitting and abutting against the first installed component.

[0013] Furthermore, the fastening pin also includes an inwardly recessed section connected to the abutting section, a positioning section connected to the inwardly recessed section, a positioning plate connected to the positioning section, an anchoring plate spaced apart from and fixedly connected to the positioning plate, and a self-centering portion spaced apart from and fixedly connected to the anchoring plate.

[0014] Furthermore, the recessed section is used to receive the snap-fit ​​connector so that the snap-fit ​​connector passes through the mounting hole when the fastening cylinder is inserted into the mounting hole of the first mounted member.

[0015] Furthermore, the fastening cylinder includes a pressure relief umbrella disposed at one end of the cylinder body, a first sealing ring disposed on one side of the pressure relief umbrella, and a second sealing ring disposed on the other side of the pressure relief umbrella.

[0016] Compared with the prior art, the detachable fastener provided by this utility model is first used by inserting the fastening cylinder with the fastening pin into the mounting hole of the first mounted part. At this time, the first mounted part is clamped between the snap-fit ​​connector and the sealing part. When the first mounted part is installed onto the second mounted part, the first mounted part is brought close to the second mounted part, and then the mounting groove of the second mounted part is inserted between the positioning plate and the anchoring plate of the fastening pin. Finally, the fastening pin is pressed so that the pressing head of the fastening cylinder engages with the corresponding groove of the abutting section of the fastening pin, thus completing the assembly of the first and second mounted parts. When it is necessary to remove the second mounted part from the first mounted part, the fastening pin can be pulled out by force. The reason why it can be pulled out by force is that there is a line contact between the abutting surface and the abutting surface, rather than a surface contact, thereby reducing the abutting force between the abutting head and the groove, and thus the fastening pin can be pulled out from the abutting head, thereby realizing the detachability of the fastener. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a detachable fastener provided in the first embodiment of the present invention.

[0018] Figure 2 for Figure 1 An exploded view of the removable fastener.

[0019] Figure 3 for Figure 2 A magnified view of the removable fastener at point A.

[0020] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of the detachable fastener.

[0021] Figure 5 for Figure 4 A magnified view of the removable fastener at point B.

[0022] Figure 6 for Figure 4 A magnified view of the removable fastener at point C.

[0023] Figure 7 This is a structural schematic diagram of a detachable fastener provided in the second embodiment of the present invention.

[0024] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of the detachable fastener Figure 9 This is a cross-sectional structural diagram of a detachable fastener provided in the third embodiment of the present invention. Detailed Implementation

[0025] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0026] like Figures 1 to 6 The diagram shown is a structural schematic of a detachable fastener provided in the first embodiment of this utility model. The detachable fastener includes a fastening cylinder 10 and a fastening pin 20 inserted into the fastening cylinder 10. It is conceivable that the detachable fastener also includes other functional modules, such as snap-fit ​​grooves, pre-tightening structures, etc., which are technologies known to those skilled in the art and will not be described in detail here.

[0027] It should be noted that the fastener is used to connect two mounted parts, which are referred to as the first mounted part and the second mounted part for distinction. In the automotive field, for example, both the first and second mounted parts can be sheet metal parts, or the first mounted part can be a sheet metal part and the second mounted part a non-metallic part, and each of the first and second mounted parts has at least one mounting hole and one mounting groove. The fastener is inserted into the mounting hole and mounting groove respectively to connect the first and second mounted parts.

[0028] The fastening cylinder 10 includes a cylindrical portion 11 and a sealing portion 12 sleeved on the cylindrical portion 11. The cylindrical portion 11 includes a cylindrical body 13, a pusher head 14 disposed at one end of the cylindrical body 13, a sealing ring mounting portion 15 disposed at the other end of the cylindrical body 13, and at least two snap-fit ​​portions 16 disposed at the waist of the cylindrical body 13. The cylindrical body 13 may be made of a non-metallic material and is cylindrical, so that the cylindrical body 13 can be inserted into the mounting hole. The pusher head 14 is a mushroom head that gradually tapers inward toward the central axis of the cylindrical body 13. In order to make the pusher head 14 elastic, at least two dividing grooves 141 are also provided on the pusher head 14, thereby dividing the pusher head 14 into several segments. Because the abutment head 14 gradually retracts inward toward the central axis of the cylinder 13, it becomes elastic, meaning each segment can open or close to facilitate abutment assembly. This will be described in detail later in conjunction with the corresponding part of the fastening pin 20. The abutment head 14 has an abutment ring 142 disposed at the end of the cylinder 13 and extending toward the central axis of the cylinder 13. The abutment ring 142 is used to cooperate with the corresponding part of the fastening pin 20, which will be described in detail later. The abutment ring 142 also has an abutment surface 143 on the side facing away from the sealing ring mounting part 15. In a cross-section along the central axis of the fastening cylinder 11, the abutment surface 143 and the central axis of the fastening cylinder 11 form an angle, and this angle is acute.

[0029] The sealing ring mounting portion 15 is an annular portion, and the sealing portion 12 covers this annular portion. To fully fix the position of the sealing portion 12, a plurality of snap-fit ​​protrusions 151 are also provided at intervals on the sealing ring mounting portion 15. The sealing ring mounting portion 15 is spaced apart from the end of the cylinder 13 facing away from the abutment head 14, so that when the sealing portion 12 is injection molded, the sealing material can extend to the inner wall of the cylinder 13, and then when the fastening pin 20 is inserted, it can abut against the fastening pin 20 to seal.

[0030] The number of the locking parts 16 is at least two. Depending on the actual situation, such as the diameter of the cylinder 13, the number of locking parts 16 can be three or four. In this embodiment, the fastening cylinder 10 has two locking parts 16 symmetrically arranged along the central axis of the fastening cylinder 10. The two locking parts 16 have the same structure and working principle. Here, we will use one locking part 16 as an example for explanation.

[0031] The snap-fit ​​portion 16 includes a window 161 formed on the cylinder 13 and a snap-fit ​​connector 162 disposed in the window 161. The window 161 may be a square window, and the snap-fit ​​connector 162 is connected to the side wall of the window 161 facing the abutment head 14. The snap-fit ​​connector 162 includes a guide surface 163 facing away from the central axis of the cylinder 13, a snap-fit ​​guide surface 164 facing the sealing ring mounting portion 15, and a snap-fit ​​surface 165 connected to the snap-fit ​​guide surface 164 and facing the sealing ring mounting portion 15. In the free state, the snap-fit ​​connector 162 extends out of the window 161, that is, the maximum outer diameter of the snap-fit ​​connector 162 is greater than the outer diameter of the cylinder 13. Thus, in the free state, the cylinder 13 can pass through the mounting hole, and the snap-fit ​​connector 162 can abut and snap onto the first mounted component. In a cross-section along the central axis of the fastening cylinder 11, the outline of the guide surface 163 forms an acute angle with the central axis of the fastening cylinder 11, and the guide surface 163 extends toward the sealing ring mounting portion 15. When the fastening cylinder 10 is inserted into the mounting hole, it first contacts the guide surface 163, thereby making it easier for the snap-fit ​​connector 162 to retract toward the central axis of the fastening cylinder 11 under the action of the guide surface 163, thus facilitating the snap-fit ​​of the first mounted component between the snap-fit ​​connector 162 and the sealing portion 12. The snap-fit ​​guide surface 164 forms an acute angle with the central axis of the fastening cylinder 11, and the snap-fit ​​guide surface 164 extends away from the sealing ring mounting portion 15. The presence of the snap-fit ​​guide surface 164 facilitates the snap-fit ​​connector 162 sliding out of the mounting hole so that the snap-fit ​​surface 165 abuts against the first mounted component. The snap-fit ​​surface 165 is perpendicular to the central axis of the fastening cylinder 11, or has a small acute angle, to facilitate snap-fitting and abutting against the first mounted component. Because the snap-fit ​​surface 165 is perpendicular to the central axis of the fastening cylinder 11, the fastening cylinder 10 will not fall out or be pulled out of the mounting hole of the first mounted component without additional tools to push the two snap-fit ​​joints 162 back into the retracted section 22 of the fastening pin 20; that is, the fastening cylinder 10 will remain on the first mounted component.

[0032] The sealing part 12 may be made of rubber and includes a covering and fixing part 121 covering the sealing ring mounting part 15, a sealing ring 122 disposed on the side facing the snap-fit ​​part 16, and a waterproof ring 123 covering the inner sidewall of the cylinder 13. The covering and fixing part 121 may be fixed to the fastening cylinder 11 by secondary injection molding, specifically, it covers the sealing ring mounting part 15. The sealing ring 122 is provided with a groove, thereby forming two raised rings, namely an outer raised ring 124 and an inner raised ring 125. In a cross section along the central axis of the fastening cylinder 11, the length of the outer raised ring 124 along the central axis is greater than the length of the inner raised ring 125, and the extension direction of the outer raised ring 124 extends away from the central axis, while the extension direction of the inner raised ring 125 extends towards the central axis. When the sealing ring 122 abuts against the first mounted component, the outer protruding ring 124 and the inner protruding ring 125 are compressed and extend in different directions, thereby giving the outer protruding ring 124 and the inner protruding ring 125 a restoring force, which in turn provides a greater abutting force, making the fastening cylinder 10 more securely installed with the first mounted component and providing a better sealing effect. Furthermore, since the length of the outer protruding ring 124 along the central axis is greater than the length of the inner protruding ring 125, and since the outer protruding ring 124 deforms away from the central axis, there is sufficient space, resulting in a larger contact area between the outer protruding ring 124 and the first mounted component, which can improve the restoring force and sealing effect. The waterproof ring 123 is located inside the cylinder 13, and the inner diameter of the waterproof ring 123 is smaller than the inner diameter of the cylinder 13. Therefore, when the fastening pin 20 is inserted into the waterproof ring 123, it can provide a sealing and waterproofing effect between the fastening pin 20 and the waterproof ring 123. To achieve the above purpose, the inner side of the waterproof ring 123 has a protrusion that is interference-fitted with the corresponding position of the fastening pin 20, namely the positioning section 23 described below.

[0033] The fastening pin 20 includes a push-off section 21, a recessed section 22 connected to the push-off section 21, a positioning section 23 connected to the recessed section 22, a positioning plate 24 connected to the positioning section 23, an anchoring plate 25 spaced apart from and fixedly connected to the positioning plate 24, and a self-centering portion 26 spaced apart from and fixedly connected to the anchoring plate 25. The fastening pin 20 can be integrally formed from rigid plastic. The push-off section 21 has at least one groove 211. In this embodiment, there are three grooves 211 to accommodate the thickness of the first installed part of different thicknesses. The grooves 211 are used to engage the push-off ring 142. In the cross-section along the central axis of the fastening cylinder 11, the groove 211 is a trapezoidal structure and has an abutment surface 212 that abuts against the push-off surface 143. In a cross-section along the central axis of the fastening cylinder 10, the outline of the abutment surface 212 forms an acute angle with the central axis of the fastening cylinder 10. Simultaneously, the angle between the outline of the abutment surface 212 and the central axis of the fastening cylinder 10 is smaller than the angle between the outline of the abutment surface 143 and the central axis of the fastening cylinder 10, thus ensuring a line contact rather than a surface contact between the abutment surface 143 and the abutment surface 212. Of course, in a cross-section along the central axis of the fastening cylinder 10, the abutment surface 143 and the abutment surface 212 form a point contact. This arrangement reduces the contact force between the abutment head 14 and the groove 211, thereby allowing the fastening pin 20 to be pulled out from the abutment head 14.

[0034] The retractable section 22 is used to receive the snap-fit ​​connector 162 when the fastening cylinder 10 is inserted into the mounting hole of the first mounted member, allowing the snap-fit ​​connector 162 to pass through the mounting hole. When the fastening cylinder 10 is inserted into the mounting hole, the fastening cylinder 10 is first inserted into the mounting hole, then the snap-fit ​​connector 162 contacts the mounting hole, and then, under the action of the guide surface 163, the snap-fit ​​connector 162 retracts towards the retractable section 22. When the first mounted member passes the snap-fit ​​connector 162, the snap-fit ​​connector 162 returns to its original position, thereby causing the snap-fit ​​surface 165 of the snap-fit ​​connector 162 to engage with the first mounted member.

[0035] The positioning section 23 is opposite to the sealing part 12. When the fastening pin 20 is inserted into the fastening cylinder 10, the positioning section 23 abuts against the waterproof ring 123. At this time, the first installed part is clamped and locked between the locking surface 165 and the outer protrusion ring 124 and the inner protrusion ring 125 of the sealing ring 122.

[0036] The positioning plate 24 and the anchoring plate 25 are spaced apart and connected by the main body of the fastening lock 20. The mounting groove of the second installed component is engaged between the positioning plate 24 and the anchoring plate 25. Therefore, the mounting groove should be an open groove with one side. The minimum distance between the positioning plate 24 and the anchoring plate 25 should be equivalent to or slightly smaller than the thickness of the second installed component. The positioning plate 24 and the anchoring plate 25 are prior art and will not be described in detail here.

[0037] The self-centering portion 26 is itself a prior art, as disclosed in publication number CN213954111U. The self-centering portion 26 has elasticity in the radial direction. When the second mounted component is also provided with a stop structure, the self-centering portion 26 abuts against the stop structure, and its elasticity allows the entire fastener to be centered without being biased to one side.

[0038] Compared with the prior art, the detachable fastener provided by this utility model is first used by inserting the fastening cylinder 10 with the fastening pin 20 into the mounting hole of the first mounted part. At this time, the first mounted part is clamped between the snap-fit ​​connector 162 and the sealing part 12. When the first mounted part is installed onto the second mounted part, the first mounted part is brought close to the second mounted part, and then the mounting groove of the second mounted part is inserted between the positioning plate 24 and the anchoring plate 25 of the fastening pin 20. Finally, the fastening pin 20 is pressed so that the pressing head 14 of the fastening cylinder 10 is engaged in the corresponding groove 211 of the abutting section 21 of the fastening pin 20, thus completing the assembly of the first and second mounted parts. When the second mounted component needs to be removed from the first mounted component, the fastening pin 20 can be pulled out by force. The reason it can be pulled out by force is that the abutting surface 143 and the abutting surface 212 are in line contact rather than surface contact, thereby reducing the abutting force between the abutting head 14 and the groove 211. Thus, the fastening pin 20 can be pulled out from the abutting head 14. At the same time, since the snap-fit ​​surface 165 is perpendicular to the central axis of the fastening cylinder 11, the fastening cylinder 10 will not fall out or be pulled out of the mounting hole of the first mounted component without the help of additional tools to push the two snap-fit ​​joints 162 back into the inner section 22 of the fastening pin 20. Therefore, when the fastening pin 20 is pulled out, only the abutting head 14 is pushed away from the central axis of the fastening cylinder 10 and then disengages from the groove 211, thus realizing the detachability of the fastener.

[0039] like Figures 7 to 8The diagram shown is a structural schematic of a detachable fastener provided in the second embodiment. The difference between the second embodiment and the first embodiment is that the fastener provided in the second embodiment does not have the self-centering portion 26 described in the first embodiment, and the structure of the sealing portion of the fastener provided in the second embodiment is different from the sealing portion 12 of the first embodiment.

[0040] The detachable fastener includes a fastening cylinder 30 and a fastening pin 40 inserted into the fastening cylinder 30. The fastening cylinder 30 includes a cylinder body 31, a pressure umbrella 32 disposed at one end of the cylinder body 31, a first sealing ring 33 disposed on one side of the pressure umbrella 32, and a second sealing ring 34 disposed on the other side of the pressure umbrella 32. It is understood that the fastening cylinder 30 also includes the abutment head and locking part present in the first embodiment, which will not be described again here.

[0041] One end of the pressure-relief umbrella 32 is connected to the cylinder 31, and the other end extends toward the pressure-relief head. Simultaneously, the angle between the extending direction of the pressure-relief umbrella 32 and the central axis of the fastening cylinder 30 is an acute angle, thus giving the pressure-relief umbrella 32 a pressure-relief force on the side facing the pressure-relief head. The first sealing ring 33 is fixedly disposed on the free side of the pressure-relief umbrella 32. It can be fixed by adhesive bonding. The first and second sealing rings 33 and 34 can be made of rubber, silicone, or foam. When the fastening cylinder 30 is inserted into the mounting hole of the first installed component, the first installed component is clamped between the first sealing ring 33 and the snap-fit ​​portion. Due to the presence of the pressure-relief umbrella 32, it provides a certain pressure-relief force to the first installed component, thereby pressing the first sealing ring 33 tightly between the first installed component and the pressure-relief umbrella 32, thus achieving a waterproof seal. The second sealing ring 34 is disposed on the side of the pressure umbrella 32 opposite to the first sealing ring 33, and it cooperates with the fastening pin to achieve a waterproof seal. The second sealing ring 34 can also be fixed to the back of the pressure umbrella 32 with adhesive.

[0042] The fastening pin 40 includes a positioning plate 41 and an anchoring plate 42 that is spaced apart from and fixedly connected to the positioning plate 41. It is conceivable that, similar to the first embodiment, the fastening pin 40 also includes a top section, a retractable section 22, and a positioning section, etc., which will not be described in detail here.

[0043] The positioning disc 41 is provided with multiple radially arranged pressure strips 411. When the fastening pin 40 is inserted into the fastening cylinder 30, the pressure strips 411 press against the second sealing ring 34. Simultaneously, the presence of the pressure strips 411 can compensate for any gaps that may exist between the positioning disc 41 and the pressure umbrella 32, thereby ensuring a waterproof and sealing effect between the positioning disc 41 and the pressure umbrella 32.

[0044] like Figure 9 The diagram shown is a structural schematic of a detachable fastener provided in the third embodiment. The difference between the third embodiment and the first embodiment is that the fastener provided in the second embodiment does not have the self-centering portion 26 described in the first embodiment. Therefore, it will not be described in detail here. To more clearly illustrate the structure of the fastener in the third embodiment, only its general structure is described here. The detachable fastener includes a fastening cylinder 50 and a fastening pin 60 inserted in the fastening cylinder 50. The fastening pin 60 includes a pushing section 61, a retracting section 62 connected to the pushing section 61, a positioning plate 63 connected to the retracting section 62, and an anchoring plate 64 spaced apart from and fixedly connected to the positioning plate 63.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A detachable fastener for connecting a first mounted member and a second mounted member, the first mounted member having a mounting hole, characterized in that: The detachable fastener includes a fastening cylinder and a fastening pin inserted into the fastening cylinder. The fastening cylinder includes a cylindrical portion, which includes a cylindrical body and a push head disposed at one end of the cylindrical body. The push head also has at least two dividing grooves. The push head has a push ring disposed at the end of the cylindrical body and extending along the central axis of the cylindrical body. The push ring has a push surface. In a cross-section along the central axis of the fastening cylinder, there is an acute angle between the push surface and the central axis of the fastening cylinder. The pin includes a stop section having at least one groove for engaging the stop ring. In a cross-section along the central axis of the fastening cylinder, the groove has a contact surface that abuts against the stop surface. In another cross-section along the central axis of the fastening cylinder, the outline of the contact surface forms an acute angle with the central axis of the fastening cylinder. The angle between the outline of the contact surface and the central axis of the fastening cylinder is smaller than the angle between the outline of the stop surface and the central axis of the fastening cylinder, such that the stop surface and the contact surface are in line contact.

2. The detachable fastener as described in claim 1, characterized in that: The fastening cylinder also includes a sealing ring mounting part disposed at the other end of the cylinder body, and at least two snap-fit ​​parts disposed at the waist of the cylinder body.

3. The detachable fastener as described in claim 2, characterized in that: The fastening cylinder also includes a sealing part sleeved on the cylindrical part. The sealing part includes a covering and fixing part covering the sealing ring mounting part, a sealing ring disposed on the side facing the snap-fit ​​part, and a waterproof ring covering the inner wall of the cylinder.

4. The detachable fastener as described in claim 3, characterized in that: The sealing ring is provided with a groove to form an outer protrusion ring and an inner protrusion ring. In the cross section along the central axis of the fastening cylinder, the length of the outer protrusion ring along the central axis is greater than the length of the inner protrusion ring, and the extension direction of the outer protrusion ring extends away from the central axis, while the extension direction of the inner protrusion ring extends closer to the central axis.

5. The detachable fastener as described in claim 2, characterized in that: The snap-fit ​​portion includes a window formed on the cylinder and a snap-fit ​​connector disposed in the window. The snap-fit ​​connector includes a guide surface facing away from the central axis of the cylinder, a snap-fit ​​guide surface facing the sealing ring mounting portion, and a snap-fit ​​surface connected to the snap-fit ​​guide surface and facing the sealing ring mounting portion.

6. The detachable fastener as described in claim 5, characterized in that: In its free state, the snap-fit ​​connector extends out of the window, meaning that the maximum outer diameter of the snap-fit ​​connector is greater than the outer diameter of the cylinder.

7. The detachable fastener as described in claim 5, characterized in that: On a cross-section along the central axis of the fastening cylinder, the outline of the guide surface has an acute angle with the central axis of the fastening cylinder, and the guide surface extends toward the sealing ring mounting portion. The snap-fit ​​guide surface has an acute angle with the central axis of the fastening cylinder, and the snap-fit ​​guide surface extends away from the sealing ring mounting portion. The snap-fit ​​surface is perpendicular to the central axis of the fastening cylinder to facilitate snap-fit ​​and abut against the first installed component.

8. The detachable fastener as described in claim 5, characterized in that: The fastening pin also includes an inward section connected to the abutment section, a positioning section connected to the inward section, a positioning plate connected to the positioning section, an anchoring plate spaced apart from and fixedly connected to the positioning plate, and a self-centering part spaced apart from and fixedly connected to the anchoring plate.

9. The detachable fastener as described in claim 8, characterized in that: The recessed section is used to receive the snap-fit ​​connector so that the snap-fit ​​connector passes through the mounting hole when the fastening cylinder is inserted into the mounting hole of the first mounted component.

10. The detachable fastener as claimed in claim 1, characterized in that: The fastening cylinder includes a pressure relief umbrella disposed at one end of the cylinder body, a first sealing ring disposed on one side of the pressure relief umbrella, and a second sealing ring disposed on the other side of the pressure relief umbrella.

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