In-ear type ear clamping Bluetooth earphone and charging box thereof

Abstract

The invention discloses an in-ear type ear clamping Bluetooth earphone, which comprises a Bluetooth earphone body, one end of the Bluetooth earphone body is provided with an ear clip used for clamping the auricle of a human body, the end part of the ear clip is connected with a mounting shell, and the outer side of the mounting shell is provided with a sound output part matched with the auricular conchae of the human body. An ear clamping space is formed among the ear clip, the Bluetooth earphone body at the two ends of the ear clip and the mounting shell, the ear clip is a soft clip, the size of a clamping area of the ear clamping space is adjustable, the sound output part comprises a sound output cylinder and a sound output port, a loudspeaker is fixedly mounted in the mounting shell, and the sound output cylinder is arranged on the outer side of the mounting shell. The ear-clamping space is adjustable, so that the earphone can adapt to different ear shapes, the wearing stability is improved, the earphone is prevented from slipping off during movement, and the in-ear rubber sleeve made of silica gel can provide soft touch feeling, adapt to the shape of an ear canal, reduce friction and compression feeling and improve the wearing comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of Bluetooth headsets, and in particular to an in-ear clip-on Bluetooth headset and a charging box thereof. Background Art

[0002] Bluetooth headsets are hands-free headsets that apply Bluetooth technology to them, allowing users to avoid the entanglement of annoying wires and make calls easily in various ways. Since the advent of Bluetooth headsets, they have been a good tool for mobile business people to improve efficiency.

[0003] At present, most Bluetooth headsets on the market are suspended on the top of the auricle, which occupies the space on the top of the auricle, causing inconvenience for those wearing glasses or other wearable devices. In addition, the headset occupies a large space and is not convenient to store. The sound outlet of existing Bluetooth headsets is usually made of plastic. After plugging it into the ear, the ear is stretched outward and causes a swollen and painful feeling when worn for a long time, which results in a poor experience. Therefore, we propose an in-ear clip-on Bluetooth headset and its charging box. Summary of the invention

[0004] The object of the present invention is to provide an in-ear clip-on Bluetooth headset and a charging box thereof to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an in-ear clip-on Bluetooth headset, comprising a Bluetooth headset body, one end of the Bluetooth headset body is provided with an ear clip for clamping a human auricle, the end of the ear clip is connected to a mounting shell, and the outer side of the mounting shell is provided with a sound outlet portion adapted to the human concha cavity, an ear clamping space is formed between the ear clip and the Bluetooth headset body and the mounting shell at both ends of the ear clip, the ear clip is a soft clip, and the clamping area size of the ear clamping space is adjustable.

[0006] Preferably, the sound output part includes a sound output tube and a sound outlet, a speaker is fixedly installed in the mounting shell, a sound output tube is arranged on the outside of the mounting shell, one end of the sound output tube extends into the mounting shell and is connected to the initial sound end of the speaker, the other end of the sound output tube is arranged with a sound outlet, and an in-ear rubber sleeve is provided on the outside of the sound output tube.

[0007] Preferably, the in-ear rubber sleeve is made of silicone material, and the in-ear rubber sleeve has an overall truncated cone structure. The inner wall of the in-ear rubber sleeve is integrally provided with a clamping ring, and the end of the sound outlet is integrally provided with a fixing ring. The clamping ring on the inner wall of the in-ear rubber sleeve is sleeved outside the fixing ring at the end of the sound outlet.

[0008] Preferably, the ear clip includes a protective soft cover and a soft rod, a soft rod is connected between the Bluetooth headset body and the mounting shell, a protective soft cover is arranged outside the soft rod, and two ends of the protective soft cover are respectively fixedly connected to the Bluetooth headset body and the mounting shell.

[0009] Preferably, a PCB board and an earphone battery are fixedly installed in the Bluetooth earphone body, and the earphone battery and the PCB board are electrically connected. The interior of the soft rod is a hollow structure, and a connecting wire is arranged inside the soft rod. The two ends of the connecting wire are respectively connected to the PCB board and the speaker, and the speaker is electrically connected to the PCB board.

[0010] A Bluetooth headset charging box comprises a charging box body, wherein the in-ear clip-on Bluetooth headset described in any one of the above items is symmetrically arranged in the charging box body.

[0011] Preferably, the charging box body includes a bottom shell and a top shell, the top of the bottom shell is connected to the top shell, the top of the bottom shell is symmetrically provided with charging slots, and the two charging slots are internally connected, the Bluetooth headset body is cooperatively connected in the charging slot, the top of the bottom shell is symmetrically provided with card slots outside the two charging slots, and the mounting shell is cooperatively connected in the card slot.

[0012] Preferably, a circuit board and a charging box battery are fixedly installed on the bottom of the inner wall of the bottom shell, and the charging box battery is electrically connected to the circuit board, contact heads are symmetrically arranged at both ends inside the bottom shell, and the contact heads are electrically connected to the charging box battery, contact through holes are symmetrically opened in the charging placement groove, and contact grooves are symmetrically opened on the outer side of the bottom end of the Bluetooth headset body, and the end of the contact head passes through the contact through hole and extends into the contact groove.

[0013] Preferably, a charging interface is provided at the bottom of the circuit board, and an end of the charging interface passes through the bottom shell.

[0014] Preferably, a rectangular groove is opened at one end of the top of the bottom shell, and a rotating shaft is fixedly connected in the rectangular groove, the top shell is integrally provided with a protrusion at one end of the bottom shell, and the protrusion is rotatably connected to the outside of the rotating shaft, a retaining spring is fixedly connected between the bottom end of the top shell and the bottom end of the bottom shell, a magnet is embedded and installed at one end of the top of the top shell away from the rotating shaft, and the top shell and the bottom shell are connected by magnetic attraction.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: an in-ear clip-on Bluetooth headset and a charging box thereof of the present invention adopt a soft ear clip design, so that the headset can be comfortably clamped on the auricle, reducing the discomfort of long-term wearing, and the adjustable ear clip space enables the headset to adapt to different ear shapes, increase the wearing stability, and prevent the headset from slipping during activities; the in-ear rubber sleeve made of silicone material can provide a soft touch, adapt to the shape of the ear canal, reduce friction and pressure, and improve wearing comfort; the truncated cone-shaped in-ear rubber sleeve and fixed ring design can effectively seal the ear canal, reduce external noise interference, and improve audio clarity and low-frequency response; the cooperation between the ear clip and the sound outlet forms an effective seal, which improves the clarity and low-frequency performance of the sound quality, while isolating external noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the Bluetooth headset of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the sound tube of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the Bluetooth headset of the present invention;

[0019] Figure 4 This is a schematic diagram of the charging box structure of the present invention;

[0020] Figure 5 It is a schematic diagram of the bottom shell structure of the present invention;

[0021] Figure 6 It is a schematic diagram of the connection structure between the Bluetooth headset and the bottom shell of the present invention;

[0022] Figure 7 It is a schematic diagram of the internal structure of the bottom shell of the present invention;

[0023] Figure 8 It is a schematic diagram of the top internal magnet structure of the present invention;

[0024] Fig. 9 It is a schematic diagram of the structure of the retaining spring of the present invention.

[0025] In the figure: 1. Bluetooth headset body; 2. Ear clip; 3. Mounting shell; 4. Ear clip space; 5. Sound output part; 6. PCB board; 7. Headphone battery; 8. Protective soft cover; 9. Connecting wire; 10. Charging box body; 11. Sound outlet; 12. Sound outlet; 13. Speaker; 14. Contact slot; 15. Bottom shell; 16. Top shell; 17. Charging interface; 18. Circuit board; 19. Charging box battery; 20. Contact head; 21. In-ear gel sleeve; 22. Charging placement slot; 23. Contact perforation; 24. Card slot; 25. Magnet; 26. Soft rod; 27. Spring retainer; 28. Rotating shaft. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1 and Figure 2The present invention provides a technical solution: an in-ear clip-on Bluetooth headset, comprising a Bluetooth headset body 1, one end of the Bluetooth headset body 1 is provided with an ear clip 2 for clamping a human auricle, the end of the ear clip 2 is connected to a mounting shell 3, and the outer side of the mounting shell 3 is provided with a sound outlet 5 adapted to the human concha cavity, an ear clip space 4 is formed between the ear clip 2 and the Bluetooth headset body 1 and the mounting shell 3 at both ends thereof, the ear clip 2 is a soft clip, and the clamping area size of the ear clip space 4 is adjustable.

[0028] It should be noted that when wearing, the soft ear clip 2 can be bent and adjusted so that the Bluetooth headset body 1 and the mounting shell 3 at both ends of the ear clip 2 are clamped on both sides of the auricle, so that the headset is firmly worn. The adjustability of the ear clip 2 space ensures that the headset adapts to different ear shapes and prevents the headset from slipping during exercise or daily activities. The soft ear clip material increases the wearing comfort, reduces the pressure on the auricle, and is not easy to cause discomfort. It is more comfortable even when worn for a long time. The ear clip 2 and the sound outlet 5 form an effective seal, which improves the clarity and low-frequency performance of the sound quality, while isolating external noise. The adjustment function of the size of the ear clip space 4 allows the user to adjust the clamping force of the headset according to personal needs, providing a more personalized wearing experience.

[0029] See also Figure 2 The sound output part 5 includes a sound output tube 11 and a sound outlet 12. A loudspeaker 13 is fixedly installed in the mounting shell 3. The sound output tube 11 is arranged on the outer side of the mounting shell 3. One end of the sound output tube 11 extends into the mounting shell 3 and is connected to the initial sound end of the loudspeaker 13. The other end of the sound output tube 11 is provided with a sound outlet 12. The outer side of the sound output tube 11 is provided with an in-ear rubber sleeve 21.

[0030] It should be noted that the setting of the sound outlet 11 can effectively transmit the sound from the speaker 13 to the sound outlet 12, reduce sound distortion, and improve the clarity and accuracy of the sound quality. At the same time, the sound outlet 11 increases the distance between the sound outlet 12 and the mounting shell 3, so that the user only needs to insert the in-ear gel sleeve 21 into the ear when wearing it.

[0031] See also Figure 1 The in-ear rubber sleeve 21 is made of silicone material, and the in-ear rubber sleeve 21 has a truncated cone structure as a whole. A clamping ring is integrally provided on the inner wall of the in-ear rubber sleeve 21, and a fixing ring is integrally provided on the end of the sound outlet tube 11. The clamping ring on the inner wall of the in-ear rubber sleeve 21 is sleeved on the outside of the fixing ring at the end of the sound outlet tube 11.

[0032] It should be noted that when wearing the earphones, the user only needs to insert the in-ear rubber sleeve 21 into the ear, and the in-ear rubber sleeve 21 is generally configured as a truncated cone structure. When worn, the end with a smaller diameter is inserted into the ear. After the end with a smaller diameter is inserted into the ear, the diameter of the rear end gradually increases, and it can be supported in the ear, making it more stable to wear. At the same time, the outer wall of the in-ear rubber sleeve 21 can fit the inner wall of the ear, thereby enhancing the sound quality and preventing the influence of external noise.

[0033] See also Figure 3 The ear clip 2 includes a protective soft cover 8 and a soft rod 26. The soft rod 26 is connected between the Bluetooth headset body 1 and the mounting shell 3. The protective soft cover 8 is arranged outside the soft rod 26. The two ends of the protective soft cover 8 are fixedly connected to the Bluetooth headset body 1 and the mounting shell 3 respectively.

[0034] It should be noted that a protective soft cover 8 is provided on the outside of the soft rod 26, which provides a soft contact surface, reduces the pressure of the ear clip 2 on the ear, and improves the wearing comfort. The soft rod 26 connects the ear clip 2 with the Bluetooth headset body 1 and the mounting shell 3, ensuring that the ear clip is firmly maintained on the ear to prevent the headset from moving or slipping. The protective soft cover 8 also reduces the direct friction between the ear clip 2 and the Bluetooth headset body 1 and the mounting shell 3, effectively preventing wear and damage. The cooperation between the soft rod 26 and the protective soft cover 8 enables the ear clip to flexibly adapt to different ear shapes, thereby enhancing the fit and comfort of wearing.

[0035] See also Figure 3 A PCB board 6 and an earphone battery 7 are fixedly installed in the Bluetooth earphone body 1, and the earphone battery 7 and the PCB board 6 are electrically connected. The inside of the soft rod 26 is a hollow structure, and a connecting wire 9 is arranged inside the soft rod 26. The two ends of the connecting wire 9 are respectively connected to the PCB board 6 and the speaker 13, and the speaker 13 and the PCB board 6 are electrically connected.

[0036] It should be noted that the electrical connection between the earphone battery 7 and the PCB board 6 can ensure power supply and support the normal operation of the earphone. The earphone battery 7 can power the PCB board 6 and the speaker 13, and then the PCB board 6 controls the speaker 13 to make sound to achieve the sound effect. The PCB board 6 is also provided with a Bluetooth main control module for Bluetooth control, a status indication module, a microphone module and a noise reduction module. The Bluetooth main control module is electrically connected to the status indication module, the microphone module and the noise reduction module respectively. The Bluetooth main control module includes a Bluetooth chip, a processor, a memory, a radio frequency (RF) module, a power management circuit, an interface circuit and an antenna;

[0037] The Bluetooth chip is responsible for transmitting and receiving Bluetooth signals to realize wireless communication functions; the processor is usually a microcontroller or microprocessor, which is used to process Bluetooth communication protocols and control data flow; the memory includes flash memory and RAM, which is used to store Bluetooth firmware and runtime data; the radio frequency (RF) module is used for modulation and demodulation of Bluetooth signals to ensure stable transmission of wireless signals; the power management circuit is responsible for the power supply and management of the Bluetooth module to ensure stable voltage and current; the interface circuit is used to communicate with other devices or systems, such as UART, SPI, I2C, etc.; antenna: used to receive and transmit Bluetooth signals to improve the effect of wireless communication.

[0038] See also Figure 4 A Bluetooth headset charging box includes a charging box body 10, and any one of the above in-ear clip-on Bluetooth headsets is symmetrically arranged in the charging box body 10.

[0039] See also Figure 4 and Figure 8 The charging box body 10 includes a bottom shell 15 and a top shell 16. The top of the bottom shell 15 is connected to the top shell 16. The top of the bottom shell 15 is symmetrically provided with charging placement slots 22, and the two charging placement slots 22 are internally connected. The Bluetooth headset body 1 is connected in the charging placement slot 22. The top of the bottom shell 15 is symmetrically provided with card slots 24 outside the two charging placement slots 22, and the installation shell 3 is connected in the card slot 24.

[0040] It should be noted that the combined design of the bottom shell 15 and the top shell 16 makes the charging box have a sturdy structure and good protection, ensuring the safety of internal electronic components and Bluetooth headsets. The charging placement slot 22 opened on the top of the bottom shell 15 provides a stable placement position for the Bluetooth headset body 1, ensuring that the headset will not move during charging and maintain good contact with the charging port. The matching connection between the mounting shell 3 and the card slot 24 ensures the stability of the internal components of the charging box and avoids poor contact due to vibration or movement during use.

[0041] See also Figure 6 and Figure 7 A circuit board 18 and a charging box battery 19 are fixedly installed at the bottom of the inner wall of the bottom shell 15, and the charging box battery 19 is electrically connected to the circuit board 18. Contact heads 20 are symmetrically arranged at both ends of the bottom shell 15, and the contact heads 20 are electrically connected to the charging box battery 19. Contact through holes 23 are symmetrically opened in the charging placement groove 22, and contact grooves 14 are symmetrically opened on the outer side of the bottom end of the Bluetooth headset body 1, and the end of the contact head 20 passes through the contact through hole 23 and extends into the contact groove 14.

[0042] It should be noted that the charging box battery 19 provides the electrical energy required for charging the Bluetooth headset body 1, while the circuit board 18 handles charging management, power control and other electrical functions. The contact through-holes 23 symmetrically opened in the charging placement slot 22 provide a path for the contact head 20 to pass through, so that the contact head 20 can directly contact the contact slot 14 at the bottom of the headset when the headset is placed in the charging slot. The contact slot 14 symmetrically opened on the outer side of the bottom of the headset provides a contact point for the contact head 20, ensuring the electrical connection during the charging process. When the Bluetooth headset body 1 is placed in the charging placement slot 22, the contact head 20 will extend into the contact slot 14 through the contact through-hole 23 to achieve a stable electrical connection.

[0043] See also Figure 4 and Figure 7 A charging interface 17 is provided at the bottom of the circuit board 18 , and an end of the charging interface 17 passes through the bottom shell 15 .

[0044] It should be noted that, through the provision of the charging interface 17 , the charging box battery 19 can be charged by a charger.

[0045] See also Figure 8 and Fig. 9 A rectangular groove is provided at one end of the top of the bottom shell 15, and a rotating shaft 28 is fixedly connected in the rectangular groove. A top shell 16 is integrally provided with a protrusion at one end of the bottom shell 15, and the protrusion is rotatably connected to the outside of the rotating shaft 28. A retaining spring 27 is fixedly connected between the bottom end of the top shell 16 and the bottom end of the bottom shell 15. A magnet 25 is embedded in the end of the top of the top shell 16 away from the rotating shaft 28, and the top shell 16 and the bottom shell 15 are connected by magnetic attraction.

[0046] It should be noted that the rotating shaft 28 fixed in the rectangular groove opened on the top of the bottom shell 15 serves as the rotation center, so that the top shell 16 can rotate around the rotating shaft 28, and the integrally arranged protrusion of the top shell 16 is rotatably connected to the outside of the rotating shaft 28, allowing the top shell 16 to rotate around the rotating shaft 28, forming an opening and closing mechanism. When the charging box is closed, the top shell 16 rotates back to the top of the bottom shell 15, and the magnet 25 is attracted to the bottom shell 15, guiding the top shell 16 to automatically align and fix on the bottom shell 15, and the retaining spring 27 ensures that the top shell 16 can be firmly fixed when closed to prevent opening. When the charging box needs to be opened, the user can rotate the top shell 16, which rotates around the rotating shaft 28, so that the top shell 16 leaves the bottom shell 15.

[0047] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation on the present invention.

[0048] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0049] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; 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. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An in-ear clip-on Bluetooth headset, characterized in that: The invention comprises a Bluetooth headset body (1), one end of which is provided with an ear clip (2) for clamping a human auricle, the end of the ear clip (2) is connected to a mounting shell (3), and the outer side of the mounting shell (3) is provided with a sound outlet (5) adapted to the human concha cavity, an ear clamping space (4) is formed between the ear clip (2) and the Bluetooth headset body (1) and the mounting shell (3) at both ends thereof, the ear clip (2) is a soft clip, and the clamping area size of the ear clamping space (4) is adjustable.

2. The in-ear clip-on Bluetooth headset according to claim 1, characterized in that: The sound output portion (5) comprises a sound output tube (11) and a sound output port (12); a loudspeaker (13) is fixedly installed in the mounting shell (3); a sound output tube (11) is arranged on the outer side of the mounting shell (3); one end of the sound output tube (11) extends into the mounting shell (3) and is connected to the initial sound end of the loudspeaker (13); the other end of the sound output tube (11) is arranged with a sound output port (12); and an in-ear rubber sleeve (21) is sleeved on the outer side of the sound output tube (11).

3. The in-ear clip-on Bluetooth headset according to claim 1, characterized in that: The in-ear rubber sleeve (21) is made of a silicone material, and the in-ear rubber sleeve (21) is in a truncated cone-shaped structure. The inner wall of the in-ear rubber sleeve (21) is integrally provided with a clamping ring, and the end of the sound outlet tube (11) is integrally provided with a fixing ring. The clamping ring on the inner wall of the in-ear rubber sleeve (21) is sleeved outside the fixing ring at the end of the sound outlet tube (11).

4. The in-ear clip-on Bluetooth headset according to claim 1, characterized in that: The ear clip (2) comprises a protective soft cover (8) and a soft rod (26); the soft rod (26) is connected between the Bluetooth headset body (1) and the mounting shell (3); the protective soft cover (8) is arranged outside the soft rod (26); and the two ends of the protective soft cover (8) are respectively fixedly connected to the Bluetooth headset body (1) and the mounting shell (3).

5. The in-ear clip-on Bluetooth headset according to claim 3, characterized in that: A PCB board (6) and an earphone battery (7) are fixedly installed in the Bluetooth earphone body (1), and the earphone battery (7) and the PCB board (6) are electrically connected. The interior of the soft rod (26) is a hollow structure, and a connecting wire (9) is arranged inside the soft rod (26). Two ends of the connecting wire (9) are respectively connected to the PCB board (6) and the speaker (13), and the speaker (13) and the PCB board (6) are electrically connected.

6. A Bluetooth headset charging box, comprising a charging box body (10), characterized in that: The charging box body (10) is symmetrically arranged with the in-ear clip-on Bluetooth headset according to any one of claims 1 to 5.

7. A Bluetooth headset charging box according to claim 5, characterized in that: The charging box body (10) includes a bottom shell (15) and a top shell (16), the top of the bottom shell (15) is connected to the top shell (16), the top of the bottom shell (15) is symmetrically provided with charging placement slots (22), and the two charging placement slots (22) are internally connected, the Bluetooth headset body (1) is connected in cooperation with the charging placement slot (22), the top of the bottom shell (15) is symmetrically provided with card slots (24) outside the two charging placement slots (22), and the mounting shell (3) is connected in cooperation with the card slot (24).

8. A Bluetooth headset charging box according to claim 7, characterized in that: A circuit board (18) and a charging box battery (19) are fixedly mounted on the bottom of the inner wall of the bottom shell (15), and the charging box battery (19) is electrically connected to the circuit board (18). Contact heads (20) are symmetrically arranged at both ends of the bottom shell (15), and the contact heads (20) are electrically connected to the charging box battery (19). Contact through holes (23) are symmetrically opened in the charging placement groove (22). A contact groove (14) is symmetrically opened on the outer side of the bottom end of the Bluetooth headset body (1), and the end of the contact head (20) passes through the contact through hole (23) and extends into the contact groove (14).

9. A Bluetooth headset charging box according to claim 8, characterized in that: A charging interface (17) is provided at the bottom of the circuit board (18), and an end of the charging interface (17) passes through the bottom shell (15).

10. A Bluetooth headset charging box according to claim 7, characterized in that: A rectangular groove is provided at one end of the top of the bottom shell (15), and a rotating shaft (28) is fixedly connected in the rectangular groove; a convex block is integrally provided at one end of the top shell (16) located at the bottom shell (15), and the convex block is rotatably connected to the outside of the rotating shaft (28); a retaining spring (27) is fixedly connected between the bottom end of the top shell (16) and the bottom end of the bottom shell (15); a magnet (25) is embedded and installed at one end of the top of the top shell (16) away from the rotating shaft (28); and the top shell (16) and the bottom shell (15) are connected by magnetic attraction.

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