Microphone with mute switching function
By setting a press and a shrapnel in the microphone and controlling its contact state with the rotating part, the mute switching function of the microphone is realized, which solves the inconvenience and noise problems in the prior art, and improves the recording quality.
Patent Information
- Application Number
- CN202421811886.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-29
AI Technical Summary
Existing microphones need to use headphones or wire control when switching silent mode, which is inconvenient to operate and easily generate noise, affecting the recording quality.
A microphone with a silent switching function is designed. By setting a pressing member and a shrapnel in the microphone, and manually rotating the rotating part makes the pressing member come into contact with the shrapnel or not contact, to realize the mute or recording function of the microphone.
It realizes the silent switching function that is convenient and fast, avoids noise during the silent switching process, and effectively ensures the recording quality.
Smart Images
Figure CN222827346U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of microphones, and in particular relates to a microphone with a mute switching function. Background Art
[0002] Microphone, also known as microphone, transmitter, microphone, is a transducer that converts sound into electronic signals. Microphones are composed of permanent magnets, sound membranes, voice coils and output transformers, and there are many types such as dynamic, condenser, electret and silicon micro-microphones. Most microphones are electret condenser microphones, which work on the principle of using a polymer vibration membrane with permanent charge isolation.
[0003] In the prior art, switching the microphone to mute mode requires headphones or a wired control, which has a long operating distance and is inconvenient to operate. In addition, other noises are easily generated during the operation of switching to mute mode using headphones or a wired control, resulting in defects in the recording. Utility Model Content
[0004] In order to solve the deficiencies of the prior art, the present invention provides a microphone with a mute switching function, which is provided with a pressing piece and a spring in the microphone, and the rotating part is manually rotated to make the pressing piece and the spring not in contact, so that the spring is not under downward pressure and tilts upward, so that the spring is not in contact with the contact point, so that the microphone is switched to the mute function; conversely, the rotating part is rotated to make the pressing piece and the spring contact, so that the spring is under downward pressure and contacts the contact point, so that the microphone is switched to the recording function. The operator only needs to rotate the microphone that is close at hand to switch the recording or mute function, which is convenient and quick to operate, avoids the phenomenon of noise generated during the mute switching operation, and effectively ensures the quality of the recording.
[0005] The technical effects to be achieved by the utility model are achieved through the following aspects:
[0006] The utility model provides a microphone with a mute switching function, comprising
[0007] The rotating part is a cylindrical structure formed by the side shell and the top shell; the side shell and the top shell form a receiving cavity, and the top shell is provided with a pressing member toward the receiving cavity;
[0008] A fixing portion is embedded in the accommodating cavity and movably connected to the top shell; the fixing portion is provided with a fixing groove corresponding to the pressing member; and
[0009] A switch part is connected to the fixing groove; the switch part is an electrical functional board formed by a circuit board and a spring sheet; the circuit board is provided with a contact point corresponding to the spring sheet, and the spring sheet is relatively provided with a first end and a second end, the first end is connected to the circuit board, and the second end is provided corresponding to the contact point;
[0010] The pressing member is in contact with the spring sheet, and the spring sheet is in contact with the contact point; or the pressing member is not in contact with the spring sheet, and the spring sheet is not in contact with the contact point.
[0011] In some implementations, the pressing member has a first surface and a second surface disposed opposite to each other, the first surface is fixedly connected to the top shell, and the second surface is disposed toward the switching portion;
[0012] The second surface includes a pressing surface and a guiding surface which are connected in sequence, the pressing surface is arranged in parallel with the first surface, and the guiding surface is arranged in an inclined manner toward the switching portion and relative to the pressing surface.
[0013] In some implementations, the second surface further includes a transition arc surface, and the transition arc surface is disposed between the guide surface and the pressing surface.
[0014] In some implementations, the spring sheet includes a first guide sheet, a pressure sheet, a second guide sheet, and a contact sheet integrally formed from the first end along the direction of the second end, and the contact sheet is arranged corresponding to the contact point.
[0015] In some implementations, the top shell is further provided with a clamping block surrounding the pressing member, and a clamping ring is provided at the upper end of the fixing portion corresponding to the clamping block; the clamping block and the clamping ring are embedded and movably connected.
[0016] In some implementations, the fixing portion includes a first shell and a second shell connected to the lower end of the first shell; the fixing groove is disposed in the first shell, the first shell is provided with a first groove, and the first groove is communicated with the fixing groove.
[0017] In some implementations, the first shell is provided with a baffle in a direction away from the fixing groove; the top shell is further provided with a limiting wall, the limiting wall surrounds a rotating area, and the baffle moves in the rotating area.
[0018] In some implementations, a first positioning block and a first supporting block are disposed in the fixing groove, the first positioning block is disposed on the inner wall of the fixing groove, and the first supporting block is disposed in an annular array on the inner wall of the fixing groove.
[0019] In some implementations, the second shell is symmetrically provided with a second groove and a silicone body, the second groove is provided on an outer wall of the second shell, and the silicone body is embedded in the second groove.
[0020] In some implementations, the microphone also includes a supporting portion, which is sleeved on the fixed portion; the inner wall of the supporting portion is provided with a second positioning block and a second supporting block, and the second supporting block is arranged in a ring array at the lower end of the second positioning block; the second shell is also provided with a positioning groove corresponding to the second positioning block, and the second supporting block contacts the lower end of the second shell and supports the second shell.
[0021] In summary, the utility model has at least the following benefits:
[0022] 1. The microphone with mute switching function provided by the utility model is provided with a pressing piece and a spring in the microphone, and the rotating part is manually rotated to make the pressing piece and the spring not in contact, so that the spring is not under downward pressure and tilts upward, so that the spring is not in contact with the contact point, so that the microphone is switched to the mute function; conversely, the rotating part is rotated to make the pressing piece and the spring contact, so that the spring is under downward pressure and contacts the contact point, so that the microphone is switched to the recording function. The operator only needs to rotate the microphone that is close at hand to switch the recording or mute function. The operation is convenient and quick, and the phenomenon of noise generated during the mute switching operation is avoided, and the quality of the recording is effectively guaranteed.
[0023] 2. The microphone with mute switching function provided by the utility model realizes the function of switching the microphone to mute or record by arranging a pressing piece and a spring in the microphone and manually rotating the rotating part so that the pressing piece and the spring are in contact or not in contact. The structural design is ingenious and simple, and the practicability is strong, and it is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 Schematic diagram of the exploded structure of the microphone in Example 1 (excluding the supporting part).
[0025] Figure 2 Schematic diagram of the structure of the rotating part in Example 1.
[0026] Figure 3 This is a schematic diagram of the structure of the fixing part in Example 1.
[0027] Figure 4 Schematic diagram of the structure of the switching unit in Example 1.
[0028] Figure 5 This is a schematic diagram of the structure of the pressing member in Example 2.
[0029] Figure 6 It is a schematic diagram of the structure of the spring piece in Example 2.
[0030] Figure 7 This is another structural schematic diagram of the rotating part in Example 2.
[0031] Figure 8 This is another structural schematic diagram of the fixing part in Example 2.
[0032] Fig. 9 This is a schematic diagram of the structure of the connection between the clamping block and the clamping ring in Example 2.
[0033] Fig.10 This is another structural schematic diagram of the fixing part in Example 2.
[0034] Fig.11 This is a schematic diagram of the structure of the top shell in Example 2 from a bottom-up perspective.
[0035] Fig.12 This is a schematic diagram of the top view structure of the fixing part in Example 2.
[0036] Fig.13 This is a schematic diagram of the structure of the support part in Example 2.
[0037] Fig.14 Schematic diagram of the structure of the microphone in Example 2.
[0038] Fig.15 Schematic diagram of the exploded structure of the microphone in Example 2.
[0039] Fig.16 Schematic diagram of the cross-sectional structure of the microphone in Example 2.
[0040] Fig.17 This is a schematic diagram of the structure of the second shell in Example 3.
[0041] Markings in the figure:
[0042] 1. Rotating portion, 11. Side shell, 12. Top shell, 121. Pressing member, 1211. First surface, 1212. Second surface, 1213. Pressing surface, 1214. Guide surface, 1215. Transition arc surface, 122. Block, 123. Limiting wall, 1231. Rotating area, 13. Accommodating cavity; 2. Fixed portion, 21. First shell, 211. Fixed groove, 2111. First positioning block, 2112. First support block, 212. Block Ring, 213, first groove, 214, baffle, 22, second shell, 221, second groove, 222, silicone body, 223, positioning groove; 3, switching part, 31, circuit board, 311, contact point, 32, spring piece, 321, first end, 322, second end, 323, first guide piece, 324, pressure piece, 325, second guide piece, 326, contact piece; 4, supporting part, 41, second positioning block, 42, second supporting block. DETAILED DESCRIPTION
[0043] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.
[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.
[0045] Embodiment 1:
[0046] Please see attached Figure 1-4 The microphone with a mute switching function of the present invention comprises a rotating part 1, a fixing part 2 and a switching part 3. The rotating part 1 is a cylindrical structure formed by a side shell 11 and a top shell 12; the side shell 11 and the top shell 12 are formed to form a receiving cavity 13, and the top shell 12 is provided with a pressing piece 121 toward the receiving cavity 13; the fixing part 2 is embedded in the receiving cavity 13 and is movably connected to the top shell 12; the fixing part 2 is provided with a fixing groove 211 corresponding to the pressing piece 121; and the switching part 3 is connected to the fixing groove 211. The switching part 3 is an electrical functional board formed by a circuit board 31 and a spring 32; the circuit board 31 is provided with a contact point 311 corresponding to the spring 32, and the spring 32 is relatively provided with a first end 321 and a second end 322, the first end 321 is connected to the circuit board 31, and the second end 322 is provided corresponding to the contact point 311; wherein the pressing member 121 is in contact with the spring 32, and the spring 32 is in contact with the contact point 311; or the pressing member 121 has no contact with the spring 32, and the spring 32 has no contact with the contact point 311.
[0047] It can be understood that the switch part 3 is an electrical function board for realizing the switching of the recording function or the mute function of the microphone. The rotating part 1 is a part for the operator to rotate the microphone, thereby controlling the switch part 3 to perform the recording function or the mute function. The fixed part 2 is used to fix the switch part 3, and relative to the movement of the rotating part 1, the fixed part 2 is static and the rotating part 1 is dynamic.
[0048] The microphone in this embodiment operates as follows: when the microphone is in the recording function, the pressing member 121 contacts the spring 32, so that the spring 32 is subjected to downward pressure, and then the second end 322 of the spring 32 contacts the contact point 311, thereby realizing the recording function of the microphone. When the microphone needs to be switched to the mute function, it is only necessary to rotate the rotating part 1 so that the pressing member 121 is separated from the spring 32, that is, the pressing member 121 is not in contact with the spring 32, and the spring 32 is not subjected to downward pressure from the pressing member 121. The spring 32 is bounced up by its own upward elastic force, thereby disconnecting the contact between the second end 322 and the contact point 311, and then the microphone realizes the mute function.
[0049] By setting the pressing member 121 and the spring 32 as described above, the rotating part 1 is manually rotated to make the pressing member 121 not in contact with the spring 32, and then the spring 32 is not under downward pressure and tilts upward, so that the spring 32 is not in contact with the contact point 311, and the microphone is switched to the mute function; conversely, the rotating part 1 is rotated to make the pressing member 121 and the spring 32 contact each other, and then the spring 32 is under downward pressure and contacts the contact point 311, and the microphone is switched to the recording function. The operator only needs to rotate the microphone that is close at hand to switch the recording or mute function. The operation is convenient and quick, and the phenomenon of noise generation during the mute switching operation is avoided, effectively ensuring the quality of the recording.
[0050] In addition, by setting the positional relationship between the rotating part 1, the fixed part 2 and the switching part 3, the overall structural design is ingenious and compact, and is convenient for the operator to operate, has strong practicality, and because the overall structure is relatively simple, it is convenient for mass production.
[0051] Embodiment 2:
[0052] The difference between this embodiment and embodiment 1 is that, see Figure 5 In this embodiment, the pressing piece 121 is relatively provided with a first surface 1211 and a second surface 1212, the first surface 1211 is fixedly connected to the top shell 12, and the second surface 1212 is arranged toward the switching part 3; wherein, the second surface 1212 includes a pressing surface 1213 and a guide surface 1214 connected in sequence, the pressing surface 1213 is arranged parallel to the first surface 1211, and the guide surface 1214 is inclined toward the switching part 3 and relative to the pressing surface 1213.
[0053] Specifically, when the microphone is in the recording function, the pressing surface 1213 is the side that abuts against the spring 32, that is, the pressing surface 1213 provides a downward pressure to the spring 32, so that the second end 322 contacts the contact point 311. When the microphone is switched from the mute function to the recording function, that is, the process from the second end 322 not contacting the spring 32 to the second end 322 contacting the spring 32, that is, the spring 32 undergoes a downward pressing process, and the action is that the pressing member 121 moves through the rotating part 1, and the guide surface 1214 contacts the spring 32 first, and the pressing member 121 continues to move until the pressing surface 1213 contacts the spring 32, so that the second end 322 can be contacted and connected with the contact point 311. Through the setting of the guide surface 1214, at the moment when the pressing member 121 contacts the spring 32, the guide surface 1214 can slowly press the spring 32 downward with the rotation, so as to ensure the smoothness and stability of the downward pressing. The pressing surface 1213 can stably press the spring 32 downward to ensure stable contact between the second end 322 and the contact point 311 .
[0054] Preferably, the second surface 1212 further includes a transition arc surface 1215, and the transition arc surface 1215 is disposed between the guide surface 1214 and the pressing surface 1213. Alternatively, the transition arc surface 1215 may be disposed at the other end of the guide surface 1214 and the pressing surface 1213. When the pressing member 121 rotates to press the spring sheet 32, the provision of the transition arc surface 1215 allows the spring sheet 32 to smoothly contact the guide surface 1214 and the pressing surface 1213, thereby avoiding a jamming phenomenon and facilitating the rotation operation.
[0055] See also Figure 6 The spring piece 32 includes a first guide piece 323, a pressure piece 324, a second guide piece 325 and a contact piece 326 which are integrally formed from the first end 321 along the direction of the second end 322, and the contact piece 326 is arranged corresponding to the contact point 311. In order to make the pressing process between the spring piece 32 and the pressing member 121 smoother and more convenient, the structure of the spring piece 32 is arranged to match the structural shape of the pressing member 121, so as to reduce the resistance in the pressing process between the pressing member 121 and the spring piece 32 and improve the ease of rotation. Specifically, when the microphone is performing the recording function, the pressure piece 324 contacts the pressing surface 1213, and the contact piece 326 contacts the contact point 311. The arrangement of the first guide piece 323 and the second guide piece 325 facilitates the pressing member 121 to smoothly approach or move away from the pressure piece 324, thereby effectively ensuring the smoothness and stability of the operation.
[0056] See also Figure 7-9The top shell 12 is also provided with a clamping block 122 surrounding the pressing member 121, and a clamping ring 212 is provided at the upper end of the fixed part 2 corresponding to the clamping block 122; the clamping block 122 and the clamping ring 212 are embedded and movably connected. By the arrangement of the clamping block 122 and the clamping ring 212 being embedded and movably connected, the rotating part 1 and the fixed part 2 can be connected, and the directional and stable rotation of the rotating part 1 can be ensured.
[0057] See also Figure 10-11 The fixing part 2 includes a first shell 21 and a second shell 22 connected to the lower end of the first shell 21; the fixing groove 211 is arranged in the first shell 21, and the first shell 21 is provided with a first groove 213, and the first groove 213 is arranged in communication with the fixing groove 211. The first groove 213 is used to allow the connection line of the circuit board 31 to pass through, so as to ensure that the line arrangement is beautiful and reasonable.
[0058] The first shell 21 is provided with a baffle 214 in a direction away from the fixing groove 211; the top shell 12 is also provided with a limit wall 123, and the limit wall 123 surrounds a rotation area 1231, and the baffle 214 moves in the rotation area 1231. In the process of rotation of the top shell 12, the baffle 214 is limited by the limit wall 123, so that the rotation angle of the top block is limited to the rotation area 1231, ensuring that the operator can switch quickly and improving the switching efficiency.
[0059] See also Fig.12 , a first positioning block 2111 and a first support block 2112 are provided in the fixing groove 211, the first positioning block 2111 is provided on the inner wall of the fixing groove 211, and the first support blocks 2112 are provided in a circular array on the inner wall of the fixing groove 211. Specifically, the circuit board 31 is placed on the first support block 2112 and connected with the first positioning block 2111, so that the circuit board 31 is embedded in the upper part of the fixing groove 211, and the circuit board 31 is further fixed by screws, effectively ensuring the stability of the placement of the circuit board 31. In addition, the first support block 2112 supports the circuit board 31, so the lower part of the fixing groove 211 is empty, which is convenient for placing the cables of the circuit board 31, and can provide heat dissipation space for the circuit board 31, ensuring the durability of the circuit board 31.
[0060] See also Figure 13-16, the microphone also includes a support part 4, which is sleeved on the fixed part 2; the inner wall of the support part 4 is provided with a second positioning block 41 and a second support block 42, and the second support block 42 is arranged in a circular array at the lower end of the second positioning block 41; the second shell 22 is also provided with a positioning groove 223 corresponding to the second positioning block 41, and the second support block 42 contacts the lower end of the second shell 22 and supports the second shell 22. Among them, the support part 4 and the rotating part 1 are arranged correspondingly, and the fixed part 2 is embedded between the support part 4 and the rotating part 1 to ensure the compactness of the overall design of the microphone. Specifically, the positioning groove 223 is inserted into the second positioning block 41, and the lower end of the second shell 22 is supported by the second support block 42, which effectively ensures the stable connection between the support part 4 and the fixed part 2, and further restricts the fixed part 2 on the support part 4 to ensure the smoothness of the microphone switching function.
[0061] Embodiment 3:
[0062] The difference between this embodiment and embodiment 1 is that, see Fig.17 In this embodiment, the second shell 22 is symmetrically provided with a second groove 221 and a silicone body 222. The second groove 221 is provided on the outer wall of the second shell 22, and the silicone body 222 is embedded in the second groove 221. By setting the silicone body 222 embedded in the second groove 221, when the fixed part 2 is embedded in the accommodating cavity 13 of the rotating part 1, there is a certain resistance between the silicone body 222 and the accommodating cavity 13, thereby ensuring that the microphone cover rotates without external force, avoiding misoperation of the microphone, and improving the accuracy of the switching function. The symmetrically arranged silicone ring can ensure the horizontality of the upper end.
[0063] Preferably, the silicone body 222 is a circular silicone body, and the shape of the second groove 221 matches the silicone body 222 to form a circle. With this arrangement, the circular silicone body can increase the friction between the accommodating cavity 13 in all directions, effectively offset the external forces from all directions, and avoid the influence of the external forces from all directions on the rotating part.
[0064] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0065] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0066] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0067] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0068] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.
Claims
1. A microphone with a mute switching function, characterized in that: include The rotating part is a cylindrical structure formed by the side shell and the top shell; the side shell and the top shell form a receiving cavity, and the top shell is provided with a pressing piece toward the receiving cavity; A fixing portion is embedded in the accommodating cavity and movably connected to the top shell; the fixing portion is provided with a fixing groove corresponding to the pressing member; and A switch part is connected to the fixing groove; the switch part is an electrical functional board formed by a circuit board and a spring sheet; the circuit board is provided with a contact point corresponding to the spring sheet, and the spring sheet is relatively provided with a first end and a second end, the first end is connected to the circuit board, and the second end is provided corresponding to the contact point; The pressing member is in contact with the spring sheet, and the spring sheet is in contact with the contact point; or the pressing member is not in contact with the spring sheet, and the spring sheet is not in contact with the contact point.
2. The microphone with mute switching function according to claim 1, characterized in that: The pressing member is provided with a first surface and a second surface opposite to each other, the first surface is fixedly connected to the top shell, and the second surface is arranged toward the switching part; The second surface includes a pressing surface and a guiding surface which are connected in sequence, the pressing surface is arranged in parallel with the first surface, and the guiding surface is arranged in an inclined manner toward the switching portion and relative to the pressing surface.
3. The microphone with mute switching function according to claim 2, characterized in that: The second surface further includes a transition arc surface, and the transition arc surface is arranged between the guide surface and the pressing surface.
4. The microphone with mute switching function according to claim 3, characterized in that: The spring piece includes a first guide piece, a pressure piece, a second guide piece and a contact piece which are integrally formed along the direction of the second end at the first end, and the contact piece is arranged corresponding to the contact point.
5. The microphone with mute switching function according to claim 1, characterized in that: The top shell is further provided with a clamping block surrounding the pressing member, and a clamping ring is provided at the upper end of the fixing portion corresponding to the clamping block; the clamping block and the clamping ring are embedded and movably connected.
6. The microphone with mute switching function according to claim 1, characterized in that: The fixing portion includes a first shell and a second shell connected to the lower end of the first shell; the fixing groove is arranged in the first shell, the first shell is provided with a first groove, and the first groove is communicated with the fixing groove.
7. The microphone with mute switching function according to claim 6, characterized in that: The first shell is provided with a baffle in a direction away from the fixing groove; the top shell is also provided with a limiting wall, the limiting wall surrounds a rotating area, and the baffle moves in the rotating area.
8. The microphone with mute switching function according to claim 6, characterized in that: A first positioning block and a first supporting block are arranged in the fixing groove. The first positioning block is arranged on the inner wall of the fixing groove. The first supporting block is arranged in an annular array on the inner wall of the fixing groove.
9. The microphone with mute switching function according to claim 6, characterized in that: The second shell is symmetrically provided with a second groove and a silicone body, the second groove is provided on the outer wall of the second shell, and the silicone body is embedded in the second groove.
10. The microphone with mute switching function according to any one of claims 6 to 9, characterized in that: The microphone also includes a supporting part, which is sleeved on the fixing part; the inner wall of the supporting part is provided with a second positioning block and a second supporting block, and the second supporting block is arranged in a ring array at the lower end of the second positioning block; the second shell is also provided with a positioning groove corresponding to the second positioning block, and the second supporting block contacts the lower end of the second shell and supports the second shell.