Electronic equipment accessory

Abstract

The embodiment of the utility model provides an electronic equipment accessory. The electronic equipment accessory comprises a main body piece, the base is arranged on the main body piece and is connected with the main body piece; the mounting piece is respectively connected with the base and the main body piece; the supporting piece is rotationally connected with the base; wherein a first mounting groove is formed in the side face of the base, a limiting piece is arranged on the base, the first mounting groove is provided with a first groove end and a second groove end, the limiting piece is partially or completely located in the first mounting groove and is close to the first groove end, the mounting piece is arranged in the first mounting groove, and the limiting piece is located in the second groove end. And one end of the mounting piece abuts against the limiting piece, and the other end of the mounting piece abuts against the second groove end. The electronic equipment accessory can abut against the installation piece, the situation that the installation piece moves in the first installation groove to cause structural damage is avoided, and the user experience feeling is improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic device accessories, and more particularly to an electronic device accessory. Background Technology

[0002] With the development of technology, more and more electronic device accessories, such as mobile phone holders, are being used in our lives, providing convenience for people.

[0003] Existing phone stands are generally attached to the back of phone cases. Since existing phone stands only support the screen vertically, they cannot be adjusted for horizontal screen support. Therefore, the following structure was designed, comprising a connecting part and a support part. The connecting part is a C-shaped ring, and the support part consists of a support and a base. The base has a C-shaped ring groove on its side, and the protective case also has a C-shaped ring groove on its recessed sidewall. During installation, the C-shaped ring is inserted into the C-shaped ring groove of the base, and the C-shaped ring is squeezed to deform and retract into the C-shaped ring groove. Then, the base is installed into the recess on the protective case. After installation, the C-shaped ring returns to its original shape, so that half of it is in the C-shaped ring groove of the base and half is in the C-shaped ring groove of the protective case, thus securing the base and the protective case and preventing them from separating. Simultaneously, the base can rotate 360 ​​degrees on the protective case via the C-shaped ring.

[0004] However, because the C-ring needs to deform during installation, the length of the C-ring groove must be greater than the length of the C-ring. After assembling the structure, there is a certain gap between the two ends of the C-ring and the sidewalls of the C-ring groove. Therefore, when the base rotates, the base will rotate relative to the C-ring first. After rotating a certain distance, the sidewall of the C-ring groove will abut against one end of the C-ring, allowing the C-ring to rotate relative to the protective shell. During the base's rotation, there will be an impact between the sidewall of the C-ring groove and one end of the C-ring. This will result in a poor user experience, as the impact will make the base rotation less smooth and may cause structural damage over time. Utility Model Content

[0005] Therefore, in order to overcome at least some of the defects and deficiencies in the prior art, this utility model provides an electronic device accessory.

[0006] Specifically, on one hand, the electronic device accessory provided in this utility model embodiment includes: a main body; a base disposed on and connected to the main body; a mounting member connected to the base and the main body; and a support member rotatably connected to the base; wherein, a first mounting groove is provided on the side of the base, a limiting member is provided on the base, the first mounting groove has a first groove end and a second groove end, the limiting member is partially or entirely located in the first mounting groove and close to the first groove end, the mounting member is disposed in the first mounting groove, one end of the mounting member contacts the limiting member, and the other end of the mounting member contacts the second groove end.

[0007] In one embodiment of the present invention, the limiting member includes a limiting protrusion, the sidewall of the first mounting groove is recessed in a direction away from the main body to form a limiting groove, the limiting protrusion extends from the bottom of the limiting groove toward the main body and obliquely extends into the first mounting groove; or, the limiting protrusion is disposed at the bottom of the first mounting groove, the limiting protrusion extends from the bottom of the first mounting groove toward the main body.

[0008] In one embodiment of the present invention, one sidewall of the limiting groove is the first groove end, and the limiting protrusion is spaced apart from the other sidewall of the limiting groove to form a gap, the width of the gap being not less than 0.5 mm.

[0009] In one embodiment of this utility model, the width of the limiting protrusion is not less than 0.8 mm.

[0010] In one embodiment of this utility model, the end of the limiting protrusion extending toward the protrusion of the main body does not exceed the side of the base.

[0011] In one embodiment of the present invention, the first mounting groove has a first sidewall and a second sidewall opposite to the first sidewall; wherein, the limiting groove is disposed on the first sidewall and the limiting protrusion is inclined toward the second sidewall.

[0012] In one embodiment of the present invention, the limiting member includes a limiting protrusion, one end of which is connected to the first groove end, and the other end of which protrudes and extends away from the first groove end and into the first mounting groove.

[0013] In one embodiment of the present invention, the limiting member includes a limiting block, which is disposed in the first mounting groove and contacts the end of the first groove.

[0014] In one embodiment of the present invention, the main body is provided with a receiving groove corresponding to the base, the base is disposed in the receiving groove, and the side wall of the receiving groove is provided with a second mounting groove, the second mounting groove is corresponding to the first mounting groove, and the mounting component is respectively engaged in the first mounting groove and the second mounting groove.

[0015] In one embodiment of this utility model, the mounting member is a C-shaped ring, the first mounting groove is a C-shaped ring groove, and the second mounting groove is an annular groove.

[0016] As can be seen from the above, this embodiment of the utility model, by installing the base onto the main body and then placing the limiting member in the first mounting groove and close to the end of the first groove, secures the mounting member by having one end abut against the limiting member and the other end abut against the end of the second groove. This effectively prevents the mounting member from moving within the first mounting groove, thereby reducing damage to electronic device accessories and improving the user experience. Furthermore, since the limiting member is placed later in the first mounting groove, it does not affect the installation process of the mounting member. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an overall structural diagram of an electronic device accessory provided in the first embodiment of this application.

[0019] Figure 2 for Figure 1 The diagram shows a partial exploded view of the electronic device accessory.

[0020] Figure 3 for Figure 2 The exploded view of the base and mounting components is shown.

[0021] Figure 4 for Figure 2 Another perspective view shown.

[0022] Figure 5 for Figure 1 The diagram shows the structure of the base.

[0023] Figure 6 for Figure 5 The enlarged view of point A shown.

[0024] Figure 7 for Figure 6The diagram shows the length of the interval and the width of the limiting protrusion.

[0025] Figure 8 for Figure 1 The diagram shown shows the structure of the base not being installed on the main body.

[0026] Figure 9 This is a structural diagram of a base for an electronic device accessory provided in the second embodiment of this application.

[0027] Figure 10 for Figure 9 The enlarged view of point B shown.

[0028] Figure 11 This is a structural diagram of a base for an electronic device accessory provided in the third embodiment of this application.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1: Electronic device accessory; 10: Main body; 11: Receiving groove; 12: Second mounting groove; 20: Base; 21: First mounting groove; 22: Spacer; 30: Mounting component; 40: Support component; 50: Limiting component; 51: Limiting protrusion; 211: First sidewall; 212: Second sidewall; 213: First groove end; 214: Second groove end; 511: First end; d1: Width of spacer; d2: Width of limiting protrusion. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, top, bottom) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] In this embodiment of the invention, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0034] In this embodiment, the electronic device accessory 1 can be, for example, an electronic device such as a mobile phone, laptop, or power bank, or it can be an electronic device accessory used on an electronic device such as a protective case or card holder. The following embodiments will use a mobile phone protective case as an example for illustration.

[0035] [First Embodiment]

[0036] See Figures 1-6 As shown, this utility model embodiment provides an electronic device accessory 1, which includes, for example, a main body 10, a base 20, a mounting component 30, and a support component 40.

[0037] The base 20 is disposed on the main body 10, for example, it can be disposed on one side of the main body 10, or it can be embedded in the main body 10 and connected to the main body 10. The mounting member 30 is connected to the base 20 and the main body 10 respectively; the support member 40 is rotatably connected to the base 20.

[0038] The base 20 has a first mounting groove 21 on its side and a limiting member 50 on it. The first mounting groove 21 has a first groove end 213 and a second groove end 214. Part or all of the limiting member 50 is located within the first mounting groove 21, close to the first groove end 213, and connected to the main body 10. One end of the mounting member 30 contacts the limiting member 50, and the other end of the mounting member 30 contacts the second groove end 214. By limiting the position through contact at both ends, the limiting member 50 can be effectively prevented from moving within the first mounting groove 21, thus solving various problems caused by the movement of the limiting member 50.

[0039] Specifically, the main body 10 is, for example, a mobile phone case. A base 20 is provided on the back of the mobile phone case. The base 20 can be, for example, the base of a bracket structure, used for the rotatable connection between the bracket structure and the main body 10. The base 20 can be, for example, an annular base. The first mounting groove 21 can be, for example, a recessed groove formed by the inward indentation of the side of the base 20. Since the base 20 is an annular base and the first mounting groove 21 is a C-shaped groove, two groove ends can be formed at both ends of the first mounting groove 21. The first groove end 213 and the second groove end 214 are the two groove ends of the first mounting groove 21. The mounting member 30 can be, for example, a C-shaped ring or a retaining spring. The support member 40 can be, for example, the support part of the bracket structure. The support member 40 can be, for example, an annular bracket. The base 20 can be provided with a storage groove for storing the support member 40. When the support function of the support member 40 is not needed, the support member 40 can be stored in the storage groove. Figure 2As shown, a receiving groove 11 may be provided on the back of the main body 10. The receiving groove 11 can be used to place the base 20. The receiving groove 11 may be, for example, a groove adapted to the base 20. When the support function of the support member 40 is not needed, the support member 40 is stored in the base 20, and the base 20 can be flush with the back of the main body 10, thereby increasing the aesthetics. The limiting member 50 may be, for example, a protrusion, which can be used to limit the movement of the mounting member 30 within the first mounting groove 21.

[0040] This embodiment of the utility model sets a limiting member 50 located in the first mounting groove 21 and close to the first groove end 213. One end of the mounting member 30 abuts against the limiting member 50, and the other end of the mounting member 30 abuts against the second groove end 214. This can prevent the mounting member 30 from moving within the first mounting groove 21. It can effectively solve the problem of the side wall of the C-shaped ring groove colliding with one end of the C-shaped ring during the rotation of the base, thereby reducing damage to the electronic device accessory 1 and improving the user experience.

[0041] Furthermore, such as Figures 2-6 As shown, the limiting protrusion 51 is disposed at the bottom of the first mounting groove 21, and the limiting protrusion 51 extends from the bottom of the first mounting groove 21 toward the main body 10. The limiting protrusion 51 may be, for example, a protrusion. The limiting protrusion 51 protrudes from the bottom of the first mounting groove 21, and the limiting protrusion 51 may or may not be tilted. For example, when the limiting protrusion 51 needs to be tilted, before the base 20 is installed on the main body 10, such as... Figure 8 As shown, the limiting member 50 is not tilted at this time. When the base 20 is installed onto the main body 10, the mounting member 30 is snapped into the first mounting groove 21 of the base 20. The mounting member 30 is pinched to deform and retract into the first mounting groove 21. Then, the base 20 is installed into the receiving groove 11 on the main body. At the same time, the limiting member 50 is bent and tilted by external force. After being installed, the mounting member 30 returns to its original shape. One end of the mounting member 30 abuts against the bent and tilted limiting member 50, so that half of it is in the first mounting groove 21 of the base 20 and half of it is in the second mounting groove 12 of the main body 10, so as to lock the base 20 and the main body 10 and prevent the base 20 and the main body 10 from separating. When the base 20 is not installed on the main body 10, the limiting member 50 is not tilted. At this time, the limiting member 50 does not restrict the movement of the mounting member 30 within the first mounting groove 21. After the base 20 and the main body 10 are connected and installed, the limiting member 50 is bent and tilted by external force, so that it can contact one end of the mounting member 30, preventing the mounting member 30 from moving within the first mounting groove 21. By limiting the protrusion direction of the limiting protrusion 51, the bending of the limiting protrusion 51 will not be interfered with by the side wall of the first mounting groove 21.

[0042] Furthermore, such as Figures 6-7As shown, the sidewall of the first mounting groove 21 is recessed away from the main body 10 to form a limiting groove. The limiting groove has two opposing sidewalls, one of which is the sidewall of the first groove end 213, i.e., the end of the first mounting groove 21, and the other sidewall is the end of the sidewall of the first mounting groove 21. The limiting protrusion 51 is spaced apart from the end of the sidewall of the first mounting groove 21 to form a gap 22, and the width d1 of the gap 22 is not less than 0.5 mm. The gap 22 can be, for example, an opening. By forming the gap 22 between the limiting protrusion 51 and the first mounting groove 21, and limiting the width d1 of the gap to not less than 0.5 mm, space is provided for the bending and tilting of the limiting protrusion 51, and it is ensured that the limiting protrusion 51 and the first mounting groove 21 will not interfere with each other. If the width is less than 0.5mm, the limiting protrusion 51 may interfere with the end of the side wall of the first mounting groove 21 during the bending and tilting process, causing the limiting protrusion 51 to bend and tilt normally, and thus failing to hold the mounting part 30 in place so that the mounting part 30 does not move.

[0043] Furthermore, the width of the limiting protrusion 51 is not less than 0.8 mm. By limiting the width of the limiting protrusion 51 to be greater than or equal to 0.8 mm, strength is ensured. If the width of the limiting protrusion 51 is too large, it will be difficult to bend down. If the width of the limiting protrusion 51 is too small, after the base 20 and the main body 10 rotate many times, the limiting protrusion 51 will deform in the direction of the first groove end 213, resulting in a gap between the limiting protrusion 51 and the end of the mounting part 30. This will cause the mounting part 30 to loosen, thus causing the same problem as in the prior art.

[0044] Furthermore, such as Figure 2 and Figure 6 As shown, the sidewall of the first mounting groove 21 is recessed inward in the direction away from the main body 10 to form a limiting groove. The bottom of the limiting groove of the limiting protrusion 51 protrudes and extends towards the main body 10, and obliquely extends into the first mounting groove 21. The end of the limiting protrusion 51 extending towards the main body 10 does not exceed the side of the base 20. Figure 6As shown, the end of the limiting protrusion 51 that protrudes toward the main body 10 is the first end 511. The first end 511 does not exceed the edge of the base 20 (the limiting protrusion 51 does not exceed the edge before or after tilting). If the first end 511 of the limiting protrusion 51 exceeds the edge of the base 20, the limiting protrusion 51 will interfere with the groove wall of the second mounting groove 12 on the main body 10, causing the base 20 to be unable to be installed into the receiving groove 11 of the main body 10. Even if the base 20 is installed into the receiving groove 11 of the main body 10, the base 20 will not be able to rotate due to the interference between the limiting protrusion 51 and the groove wall of the second mounting groove 12 on the main body 10, thus failing to meet the multi-angle support function of the support member 40.

[0045] Furthermore, such as Figure 5 As shown, the first mounting groove 21 has a first sidewall 211 and a second sidewall 212 opposite to the first sidewall 211; wherein, the limiting protrusion 51 is disposed on the first sidewall 211 and inclined toward the second sidewall 212, or the limiting protrusion 51 is disposed on the second sidewall 212 and inclined toward the first sidewall 211. That is, the limiting protrusion 51 can be disposed on the first sidewall 211 and near the first groove end 213 or disposed on the second sidewall 212 and near the first groove end 213, and can abut against one end of the mounting member 30 through the limiting member 50, thereby preventing the mounting member 30 from moving in the first mounting groove 21, reducing the collision between the base 20 and the mounting member 30, and effectively improving the service life of the mounting member 30.

[0046] Furthermore, such as Figure 2 As shown, the main body 10 is provided with a receiving groove 11 corresponding to the base 20. The base 20 is disposed in the receiving groove 11. The side wall of the receiving groove 11 is provided with a second mounting groove 12, which corresponds to the first mounting groove 21. The mounting member 30 is respectively engaged in the first mounting groove 21 and the second mounting groove 12. The receiving groove 11 is, for example, a recess that can be adapted to the base 20. For example, if the base is an annular base, then the receiving groove 11 is an annular recess, and the size of the annular recess is adapted to the size of the annular base. The annular groove is further provided with a second mounting groove 12. The second mounting groove 12 can be adapted to the mounting component 30. That is, in order to lock the base 20 and the main body 10 and prevent the base 20 and the main body 10 from separating, the base 20 and the main body 10 need to be connected. Therefore, the mounting component 30 is simultaneously locked in the first mounting groove 21 and the second mounting groove 12, thereby locking the base 20 and the main body 10.

[0047] Furthermore, the mounting component 30 is a C-shaped ring. A C-shaped ring refers to the mounting component 30 being bent from a strip into a ring shape, but the two ends of the strip do not close the ring; instead, they are spaced apart, allowing the two ends of the C-shaped ring to be brought closer together by compression, thus changing the size of the ring. The first mounting groove 21 is a C-shaped ring groove, which refers to a groove extending circumferentially along the base 20, but not along the entire circumference. Instead, it extends a suitable distance circumferentially, so that the two ends of the groove do not meet but are spaced apart, thus cooperating with the C-shaped ring. The second mounting groove 12 is an annular groove, allowing the C-shaped ring to rotate 360 ​​degrees within the annular groove, thereby realizing the rotation of the base 20 and the main body 10.

[0048] [Second Embodiment]

[0049] like Figures 9-10 As shown, the structure of the electronic device accessory 1 provided in this embodiment is basically the same as that of the electronic device accessory provided in the first embodiment. The main difference is that one end of the limiting protrusion 51 is connected to the first groove end 213, and the other end of the limiting protrusion 51 protrudes and extends in a direction away from the first groove end 213 and extends into the first groove.

[0050] Specifically, such as Figure 9 and Figure 10 As shown, the limiting member 50 includes a limiting protrusion 51, one end of which is connected to the first groove end 213, and the other end of which protrudes and extends from the first groove end 213 in a direction away from the first groove end 213. Figure 10 As shown, the protrusion direction of the limiting protrusion 51 is different from that of the limiting protrusion in the first embodiment. One end of the limiting protrusion 51 is connected to the first groove end 213, and the other end of the limiting protrusion 51 protrudes and extends in a direction away from the first groove end 213. The limiting protrusion 51 can extend to the end close to the side wall of the first mounting groove 21. When the base 20 is not installed on the main body 10, the limiting protrusion 51 does not bend. When the base 20 is installed on the main body 10, the limiting protrusion 51 bends downward or upward by external force, thereby abutting one end of the mounting member 30.

[0051] This embodiment of the invention provides a limiting protrusion 51 on the base 20. One end of the limiting protrusion 51 is connected to the first groove end 213, and the other end of the limiting protrusion 51 protrudes away from the first groove end 213. The other end of the limiting protrusion 51 abuts against the mounting member 30, preventing the mounting member 30 from moving within the first mounting groove 21. When the base 20 is not installed on the main body 10, the limiting protrusion 51 is not tilted, and at this time, the limiting protrusion 51 does not restrict the movement of the mounting member 30 within the first mounting groove 21. After the base 20 and the main body 10 are connected and installed, external force bends and tilts the limiting protrusion 51, allowing it to abut against one end of the mounting member 30, preventing the mounting member 30 from moving within the first mounting groove 21, reducing collisions between the base 20 and the mounting member 30, and effectively improving the service life of the mounting member 30.

[0052] [Third Embodiment]

[0053] like Figure 11 As shown, the structure of the electronic device accessory 1 provided in this embodiment is basically the same as that of the electronic device accessory provided in the first embodiment, except that the limiting member 50 includes a limiting block 52.

[0054] Specifically, such as Figure 11 As shown, the limiting member 50 includes a limiting block 52, which is disposed within the first mounting groove 21 and contacts the end 213 of the first groove. For example, an opening or gap may be formed between the first mounting groove 21 and the end 213 of the first groove. The limiting block 52 can be filled into this gap, allowing one end of the mounting member 30 to contact the limiting block 52. This prevents the mounting member 30 from rotating within the first mounting groove 21, reduces collisions between the base 20 and the mounting member 30, and effectively extends the service life of the mounting member 30.

[0055] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of this utility model. Provided that the technical features do not conflict, the structure is not contradictory, and the inventive purpose of this utility model is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electronic device accessory (1), characterized in that, include: Main component (10); A base (20) is disposed on the main body (10) and connected to the main body (10); Mounting component (30) is connected to the base (20) and the main body component (10) respectively; The support member (40) is rotatably connected to the base (20); The base (20) has a first mounting groove (21) on its side and a limiting member (50) on its base (20). The first mounting groove (21) has a first groove end (213) and a second groove end (214). The limiting member (50) is partially or entirely located in the first mounting groove (21) and close to the first groove end (213). The mounting member (30) is disposed in the first mounting groove (21). One end of the mounting member (30) is in contact with the limiting member (50), and the other end of the mounting member (30) is in contact with the second groove end (214).

2. The electronic device accessory (1) according to claim 1, characterized in that, The limiting member (50) includes a limiting protrusion (51), the side wall of the first mounting groove (21) is recessed in a direction away from the main body (10) to form a limiting groove, the limiting protrusion (51) extends from the bottom of the limiting groove toward the main body (10) and extends obliquely into the first mounting groove (21). Alternatively, the limiting protrusion (51) is disposed at the bottom of the first mounting groove (21), and the limiting protrusion (51) extends from the bottom of the first mounting groove (21) toward the main body (10).

3. The electronic device accessory (1) according to claim 2, characterized in that, One of the sidewalls of the limiting groove is the first groove end (213), and the limiting protrusion (51) is spaced apart from the other sidewall of the limiting groove to form a gap position (22), the width of the gap position (22) is not less than 0.5 mm.

4. The electronic device accessory (1) according to claim 2, characterized in that, The width of the limiting protrusion (51) is not less than 0.8 mm.

5. The electronic device accessory (1) according to claim 2, characterized in that, The end of the limiting protrusion (51) that protrudes toward the main body (10) does not exceed the side of the base (20).

6. The electronic device accessory (1) according to claim 5, characterized in that, The first mounting groove (21) has a first sidewall (211) and a second sidewall (212) opposite to the first sidewall (211); wherein the limiting groove is disposed on the first sidewall (211) and the limiting protrusion (51) is inclined toward the second sidewall (212).

7. The electronic device accessory (1) according to claim 1, characterized in that, The limiting member (50) includes a limiting protrusion (51), one end of which is connected to the first groove end (213), and the other end of which protrudes and extends in a direction away from the first groove end (213) and into the first mounting groove (21).

8. The electronic device accessory (1) according to claim 1, characterized in that, The limiting member (50) includes a limiting block (52), which is disposed in the first mounting groove (21) and contacts the end (213) of the first groove.

9. The electronic device accessory (1) according to any one of claims 1-8, characterized in that, The main body (10) is provided with a receiving groove (11) corresponding to the base (20). The base (20) is disposed in the receiving groove (11). The side wall of the receiving groove (11) is provided with a second mounting groove (12). The second mounting groove (12) corresponds to the first mounting groove (21), and the mounting component (30) is respectively engaged in the first mounting groove (21) and the second mounting groove (12).

10. The electronic device accessory (1) according to claim 9, characterized in that, The mounting component (30) is a C-shaped ring, the first mounting groove (21) is a C-shaped ring groove, and the second mounting groove (12) is an annular groove.

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