A desktop microphone with a charging dock

Abstract

This utility model discloses a desktop microphone with a charging base, including a stand, a charging base, a microphone, and a reinforcing mechanism. The stand and the charging base are integrally formed, and one side of the stand has an integrally formed elastic clip. This utility model uses the elastic clip to initially fix the microphone, and the arc-shaped baffle of the reinforcing mechanism achieves further fixation through the cooperation of a threaded rod and a nut. The arc-shaped block of the clamping component allows for more precise fixing and adjustment. The multiple fixing structures work together to effectively ensure the installation stability of the microphone, greatly reducing the possibility of the microphone becoming unstable, shaking, or even falling off during use. When the bottom of the microphone is inserted into the charging base, the precise alignment of the positioning rod and the positioning hole ensures accurate connection between the charging port and the charging interface, guaranteeing a smooth charging process without the need for repeated manual adjustments. The operation is simple and convenient, improving charging efficiency.

Description

Technical Field

[0001] This utility model relates to the field of microphone technology, specifically a desktop microphone with a charging base. Background Technology

[0002] Currently, common microphones are usually powered by either a long power cord or a built-in battery. However, this has the following inconveniences: if a long power cord is used, it can easily cause people to trip in crowded places such as KTVs, and the user's movement distance is limited, making it very inconvenient to use.

[0003] To address the issue of microphone wiring, a solution for a microphone charging dock (publication number: CN208539614U) was found. This microphone charging dock has a USB interface for charging at the bottom of the microphone. It includes: a base with a cylindrical groove adapted to the shape of the microphone's bottom; and a USB connector adapted to the shape of the USB interface and positioned at the bottom of the groove. When the microphone is inserted into the groove, the USB connector aligns with the USB interface, and the USB connector is electrically connected to an external power source.

[0004] However, the drawback of this existing technology is that it relies solely on the fit between the groove and the bottom shape of the microphone to maintain basic stability. In actual use, if the desktop is subjected to external forces such as vibration or collision, the microphone is very likely to become unstable, shake, or even fall out of the groove. It is difficult to ensure that the microphone is always in the right working position, thus affecting the user experience and device safety.

[0005] In light of this, we are launching a desktop microphone with a charging dock. Utility Model Content

[0006] The purpose of this invention is to provide a desktop microphone with a charging base to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a desktop microphone with a charging base, comprising: a stand, a charging base, a microphone, and a reinforcement mechanism;

[0008] The stand and the charging base are integrated into one piece, and one side of the stand has an integrated elastic clip.

[0009] The microphone is snapped into the surface of the elastic card, and the bottom of the microphone is inserted into the charging base to charge the microphone when it is out of power.

[0010] The reinforcement mechanism is installed on the surface of the bracket to prevent the microphone from becoming unstable. The threaded rod of the reinforcement mechanism passes through the fixing block and the arc-shaped baffle fixes the microphone, thereby effectively ensuring the installation stability of the microphone.

[0011] Preferably, the reinforcement mechanism includes a nut threaded to a threaded rod, a fixing block fixedly disposed on the surface of the bracket, and the threaded rod passing through the fixing block and connecting to the side of the arc-shaped baffle, thereby the arc-shaped baffle contacting the surface of the microphone to fix the microphone.

[0012] Preferably, the surface of the fixing block is integrally formed with a through hole for the threaded rod to pass through, and a clamping assembly is provided between the arc-shaped baffle and the microphone. The push rod of the clamping assembly drives the arc-shaped block closer to the surface of the microphone to further fix the microphone and prevent the microphone from shaking.

[0013] Preferably, the clamping assembly includes a push rod that passes through one side of the arc-shaped baffle and a push block, the arc-shaped block being located on the inner side of the arc-shaped baffle and the push rod being fixedly connected to the arc-shaped block.

[0014] Preferably, one side of the surface of the arc-shaped baffle has a through hole for the push rod to pass through.

[0015] Preferably, the surface of the arc-shaped baffle is connected to a tensioned elastic rope, one end of which is connected to a pin for fixing the push rod. The surface of the pin is provided with a lifting plate for limiting the position inside the arc-shaped baffle. The interior of the arc-shaped baffle is provided with a limiting groove for sliding the lifting plate. The surface of the pin is fitted with a first spring for resetting the pin, and the bottom of the first spring contacts the lifting plate, while the top of the first spring contacts the bottom wall of the limiting groove. The surface of the push rod is provided with equally spaced insertion holes for inserting the pin to prevent the push rod from moving.

[0016] Preferably, the surface of the charging base is connected to a USB charging port, the interior of the charging base is provided with a positioning rod for inserting into the microphone, and the interior of the microphone is provided with a positioning hole for inserting the positioning rod. The surface of the charging base is provided with a charging port for charging, and the bottom of the microphone is provided with a charging interface for inserting the charging port.

[0017] Preferably, the back side of the bracket is provided with a support frame for support, and a reinforcing rib is provided between the support frame and the bracket for reinforcement. One side of the support frame is provided with a positioning part for connection to the table edge. The bottom of the support frame and the positioning part is provided with a rotation mechanism for driving the bracket, charging base and microphone. The positioning shaft of the rotation mechanism passes through the positioning part to cooperate with the use of the bracket, allowing the bracket, charging base and microphone to rotate to different positions for convenient use.

[0018] Preferably, the microphone has a dust cover on top for blocking dust, and a power switch on the surface of the microphone for turning the microphone on and off.

[0019] Preferably, the rotating mechanism includes a base plate connected to the bottom of the bracket, and the base plate is in contact with the support frame, the charging base, and the bracket. A positioning shaft is connected between two sets of brackets. Both ends of the positioning shaft pass through the bracket and are connected to a disc. A movable disc is slidably attached to the surface of the positioning shaft. Positioning rods for fixing the positioning part are provided at equal intervals on the surface of the movable disc. Positioning grooves for inserting the positioning rods are provided at equal intervals on the surface of the positioning part. A second spring for pushing the movable disc is sleeved on the surface of the positioning shaft and located between the movable disc and the disc.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] (1) The microphone is initially fixed by the elastic clip. The arc baffle of the reinforcement mechanism is further fixed by the cooperation of the threaded rod and nut. The arc block of the clamping component can be more precisely fixed and adjusted. The multiple fixing structures work together to effectively ensure the installation stability of the microphone and greatly reduce the situation of unstable fixing, shaking or even falling off the microphone during use, ensuring that the microphone can always be kept in the appropriate working position.

[0022] (2) When the microphone is inserted into the charging base from the bottom, the precise alignment of the positioning rod and the positioning hole ensures that the charging port and the charging interface are accurately connected, ensuring a smooth charging process. There is no need for repeated manual adjustments to the alignment, making the operation simple and convenient, improving charging efficiency, and allowing users to quickly charge the microphone when it is out of power without affecting its use.

[0023] (3) By pulling the moving plate of the rotating mechanism, the moving plate compresses the second spring, causing the positioning rod to disengage from the positioning slot. Then, the bracket, charging base and microphone can be rotated to a suitable position, so that the microphone can rotate flexibly within the range of 0-180 degrees. After rotating to the designated position, the moving plate is released, and the positioning rod is inserted into the positioning slot again to fix the bracket, charging base and microphone, so that the microphone can also be adjusted in angle while charging, realizing the dual functions of charging and use on the desktop.

[0024] (4) To prevent the push rod from moving, the pin is inserted into the equally spaced holes on the surface of the push rod. Under the elastic force of the first spring, the pin can be stably inserted into the holes, thereby fixing the position of the push rod and preventing it from moving. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a side view of the structure of this utility model;

[0027] Figure 3 This is a three-dimensional exploded view of the arc-shaped baffle, arc-shaped block, fixing block, and nut of this utility model;

[0028] Figure 4 This is a schematic diagram of the three-dimensional connection of the arc-shaped baffle, arc-shaped block, and fixing block of this utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the arc-shaped baffle and arc-shaped block of this utility model.

[0030] Figure 6 This is a three-dimensional structural diagram of the charging base and charging port of this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the microphone of this utility model;

[0032] Figure 8 This is a side sectional view of the arc-shaped baffle of this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the bracket and rotating mechanism of this utility model;

[0034] Figure 10 This is a schematic diagram of the structure of the bracket, support frame, and microphone rotation of this utility model.

[0035] In the diagram: 1. First bracket; 2. Elastic clip; 3. Microphone; 4. Dust cover; 5. Power switch; 6. Charging base; 7. Support frame; 8. Reinforcing rib; 9. Positioning part; 10. Arc-shaped baffle; 11. Fixing block; 12. Threaded rod; 13. Nut; 14. Through hole; 15. Push block; 16. Push rod; 17. Insertion hole; 18. Arc-shaped block; 19. Elastic rope; 20. Pin; 21. Through hole; 22. USB charging port; 23. First positioning rod; 24. Charging port; 25. Positioning hole; 26. Charging interface; 27. First spring; 28. Limiting groove; 29. ​​Lifting plate; 30. Base plate; 31. Second bracket; 32. Disc; 33. Positioning shaft; 34. Second spring; 35. Moving disc; 36. Second positioning rod. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" 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 a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] This desktop microphone with a charging base is designed for ease of use and stable performance. It has a compact structure and complete functions. It mainly consists of a first stand 1, a charging base 6, a microphone 3 and a number of auxiliary mechanisms. All components work together to achieve efficient sound pickup and convenient charging.

[0039] Please see Figure 1-10 This utility model provides a technical solution: a desktop microphone with a charging base, comprising:

[0040] The first bracket 1 and the charging base 6 are made of one piece, which not only improves the stability of the overall structure, but also simplifies the assembly process. The elastic clip 2 on one side of the surface of the first bracket 1 is made of highly elastic material. With its own elasticity, it can quickly achieve the initial fixation of the microphone 3. Its arc-shaped contact surface can adapt to microphones 3 of different diameters. During installation, it fits tightly to the surface of the microphone 3 through elastic deformation, forming the first layer of stable protection.

[0041] Microphone 3, as the core sound-receiving component, is initially positioned during installation using the elastic clip 2. Once the bottom is precisely inserted into the charging base 6, the charging function is triggered. When the microphone's battery is low, the charging base 6 connects to the charging interface 26 at the bottom of the microphone via the built-in charging port 24, quickly initiating the charging process. Combined with the USB charging port 22 on the side, it can flexibly connect to a connector for charging, providing power to the charging base 6. It can also flexibly connect to a power adapter or computer, meeting diverse charging needs. The first positioning rod 23 inside the charging base 6 precisely engages with the positioning hole 25 at the bottom of the microphone, further limiting the microphone's lateral displacement during charging and preventing poor charging contact.

[0042] To address the issue of unstable fixation of the traditional microphone 3, the device features a reinforced mechanism. The fixing block 11 is firmly welded to the surface of the first bracket 1, and its through hole 14 provides a stable through channel for the threaded rod 12. By rotating the threaded rod 12, the user can move the arc-shaped baffle 10 laterally until it comes into close contact with the surface of the microphone 3. The threaded rod 12 is then locked by the nut 13 to form a rigid fixation. The clamping component inside the arc-shaped baffle 10 further enhances the fixing effect. Pressing the push block 15 can drive the push rod 16 to push the arc-shaped block 18, making the arc-shaped block 18 fit against the surface of the microphone 3. After releasing, the pin 20 is inserted into the insertion hole 17 of the push rod 16 under the action of the first spring 27 to achieve position locking. This double fixing structure effectively eliminates the risk of shaking during the use of the microphone 3.

[0043] The support frame 7 on the back of the first bracket 1 is connected to the bracket through the reinforcing rib 8, forming a stable triangular support structure, which greatly improves the anti-tipping ability of the device when placed on the table. The positioning part 9 on the surface of the support frame 7 can be precisely aligned with the edge of the table. It can be adjusted to multiple angles in conjunction with the rotating mechanism at the bottom. The rotating mechanism supports the weight of the first bracket 1, the charging base 6 and the microphone 3 through the base plate 30. The positioning shaft 33 passes through the second bracket 31 and is connected to the disc 32. Under the elastic force of the second spring 34, the second positioning rod 36 on the surface of the moving disc 35 is always embedded in the positioning groove of the positioning part 9. When adjusting the angle, the moving disc 35 is pulled to compress the second spring 34, causing the second positioning rod 36 to disengage from the positioning groove. After rotating to the required angle, it is released. The second positioning rod 36 is pushed by the elastic force of the second spring 34 itself, so that the second positioning rod 36 of the moving disc 35 automatically resets and locks (i.e., the second positioning rod 36 is inserted into the positioning groove), so that the microphone 3 can rotate flexibly within the range of 0-180 degrees to meet the sound pickup angle requirements of different usage scenarios.

[0044] The dust cover 4 on top of the microphone 3 can effectively prevent dust from falling into the microphone hole and extend the service life of the device; the power switch 5 on the surface adopts a touch-sensitive push design, which makes it convenient for users to quickly start and stop the microphone function. The overall device has optimized structure and integrated functions, taking into account ease of use, stability and charging safety, and is suitable for various scenarios such as desktop live streaming, video conferencing, and voice recording.

[0045] Specifically, in use, the first bracket 1 and the charging base 6 are integrally molded, providing a stable basic structure for the entire device. The elastic clip 2 on one side of the surface of the first bracket 1 is also integrally molded. When installing the microphone 3, the microphone 3 is first clipped into the surface of the elastic clip 2. The elastic clip 2 uses its own elastic properties to initially clamp and fix the microphone 3, realizing the initial positioning of the microphone 3. At the same time, the bottom of the microphone 3 is inserted into the interior of the charging base 6. This not only prepares for subsequent charging, but also further restricts the displacement of the microphone 3 and enhances the initial fixing effect.

[0046] The reinforcement mechanism is used to further fix the microphone 3 and prevent it from being unstable. The fixing block 11 is fixed on the surface of the first bracket 1. The surface of the fixing block 11 has an integrally formed through hole 14. The threaded rod 12 can pass through the through hole 14. After passing through the fixing block 11, the threaded rod 12 is connected to the side of the arc-shaped baffle 10. After the microphone 3 is initially fixed, the arc-shaped baffle 10 is moved closer to the microphone 3 until the inner side of the arc-shaped baffle 10 contacts the surface of the microphone 3. At this time, the nut 13 screwed to the threaded rod 12 is tightened. The nut 13 interacts with the fixing block 11 to fix the position of the threaded rod 12, thereby making the arc-shaped baffle 10 stably fix the microphone 3.

[0047] The clamping assembly can further fix the microphone 3 and prevent it from shaking. A through hole 21 is provided on one side of the surface of the arc baffle 10. The push rod 16 passes through the through hole 21. One end of the push rod 16 is connected to the push block 15, and the other end is fixedly connected to the arc block 18 on the inner side of the arc baffle 10. Pushing the push block 15 can drive the push rod 16 to move in the through hole 21, thereby making the arc block 18 approach and contact the surface of the microphone 3, enhancing the fixing effect.

[0048] To prevent the push rod 16 from moving, an elastic rope 19 is connected to the surface of the arc-shaped baffle 10. One end of the elastic rope 19 is connected to a pin 20. A lifting plate 29 is provided inside the arc-shaped baffle 10 on the surface of the pin 20. A limit groove 28 is opened inside the arc-shaped baffle 10, and the lifting plate 29 can slide within the limit groove 28. A first spring 27 is sleeved on the surface of the pin 20. The bottom of the first spring 27 contacts the lifting plate 29, and the top contacts the bottom wall of the limit groove 28. When it is necessary to fix the push rod 16, the pin 20 is inserted into the surface of the push rod 16. Within the equally spaced insertion holes 17, under the elastic force of the first spring 27, the pin 20 can be stably inserted into the insertion hole 17, thereby fixing the position of the push rod 16. When it is necessary to adjust the push rod 16, pull the pin 20 or the elastic rope 19 at the top of the pin 20, thereby causing the lifting plate 29 to compress the first spring 27, and the pin 20 will gradually disengage from the inside of the arc-shaped baffle 10 (the lifting plate 29 on the surface of the pin 20 can restrict the pin 20 from disengaging from the inside of the arc-shaped baffle 10), so that the pin 20 disengages from the insertion hole 17.

[0049] The surface of the charging base 6 is connected to a USB charging port 22 for connecting to an external power source. When the bottom of the microphone 3 is inserted into the charging base 6, the first positioning rod 23 inside the charging base 6 will insert into the positioning hole 25 inside the microphone 3 to achieve precise alignment. At the same time, the charging port 24 in the center of the surface of the charging base 6 will mate with the charging interface 26 at the bottom of the microphone 3, thereby enabling the microphone 3 to be charged when it is out of power. Due to the cooperation between the first positioning rod 23 and the positioning hole 25, the charging port 24 and the charging interface 26 can be accurately aligned, ensuring a smooth charging process.

[0050] The rotating mechanism is used to rotate the first bracket 1, charging base 6, and microphone 3 to different positions for easy use. The rotating mechanism includes a base plate 30, which contacts the support frame 7, charging base 6, and first bracket 1. The bottom of the second bracket 31 is connected to the base plate 30. A positioning shaft 33 is connected between the two sets of second brackets 31, with its two ends passing through the second brackets 31 and connected to a disc 32. A movable disc 35 slides on the surface of the positioning shaft 33. Second positioning rods 36 are evenly spaced on the surface of the movable disc 35. Positioning grooves are evenly spaced on the surface of the positioning part 9. A second spring 34 is sleeved on the surface of the positioning shaft 33, located between the movable disc 35 and the disc 32. Under the elastic force of the second spring 34, the movable disc 35 is pushed towards the positioning part 9, causing the second positioning rods 36 to insert into the positioning grooves. With the current position fixed, when rotation is needed, pull the movable disk 35. The movable disk 35 compresses the second spring 34, causing the second positioning rod 36 to disengage from the positioning groove. Then, the first bracket 1, charging base 6, and microphone 3 can be rotated to the appropriate position. After rotating to the designated position, release the movable disk 35, and the second positioning rod 36 will re-insert into the positioning groove, fixing the first bracket 1, charging base 6, and microphone 3. This allows the microphone 3 to be adjusted in angle while charging, achieving dual functions of charging and use on the desktop. The top of the microphone 3 is equipped with a dust cover 4 to block dust and protect the microphone 3. The surface of the microphone 3 is equipped with a power switch 5 for turning the microphone 3 on and off. The back of the first bracket 1 is equipped with a support frame 7, and a reinforcing rib 8 is provided between the support frame 7 and the first bracket 1 to enhance the stability of the support.

[0051] After charging is complete, microphone 3 needs to be rotated to the usage position (e.g., Figure 10 As shown), by pulling the movable disk 35 to compress the second spring 34, the second positioning rod 36 is disengaged from the positioning groove and rotated to the desired angle (as shown). Figure 10 As shown, when rotating 70°-85°, the second positioning rod 36 is then released and pushed by the elastic force of the second spring 34, allowing the second positioning rod 36 of the moving disk 35 to automatically reset and lock (i.e., the second positioning rod 36 is inserted into the positioning slot), so that the microphone 3 can rotate flexibly, making it convenient to use the fully charged microphone 3. During continuous important meetings, the microphone 3 can also be used while charging.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A table microphone with a charging base, characterized by, include: The first bracket (1) and the charging base (6) are integrally formed, and an integrally formed elastic card (2) is provided on one side of the surface of the first bracket (1). Microphone (3), the microphone (3) is inserted into the surface of the elastic card (2), and the bottom of the microphone (3) is inserted into the inside of the charging base (6) to charge the microphone (3) that is out of power; The reinforcement mechanism is set on the surface of the first bracket (1) to prevent the microphone (3) from being unstable. The threaded rod (12) of the reinforcement mechanism passes through the fixing block (11) to fix the microphone (3) with the arc baffle (10), thereby effectively ensuring the installation stability of the microphone (3).

2. The table microphone with charging base of claim 1, wherein, The reinforcement mechanism includes a nut (13) screwed to a threaded rod (12), a fixing block (11) fixed on the surface of the first bracket (1), and the threaded rod (12) passes through the fixing block (11) and connects to the side of the arc baffle (10), so that the arc baffle (10) contacts the surface of the microphone (3) to fix the microphone (3).

3. The table microphone with charging base of claim 1, wherein, The surface of the fixing block (11) is integrally formed with a through hole (14) for the threaded rod (12) to pass through. A clamping assembly is provided between the arc baffle (10) and the microphone (3). The push rod (16) of the clamping assembly drives the arc block (18) to approach the surface of the microphone (3) to further fix the microphone (3) and prevent the microphone (3) from shaking.

4. The table microphone with charging base of claim 3, wherein, The clamping assembly includes a push rod (16) that passes through a push block (15) on one side of the arc-shaped baffle (10), an arc-shaped block (18) located on the inner side of the arc-shaped baffle (10), and the push rod (16) and the arc-shaped block (18) are fixedly connected.

5. A table microphone with a charging base according to claim 4, wherein, The arc-shaped baffle (10) has a through hole (21) on one side of its surface for passing through the push rod (16).

6. The table microphone with charging base of claim 4, wherein, The surface of the arc-shaped baffle (10) is connected to a tensioned elastic rope (19). One end of the elastic rope (19) is connected to a pin (20) for fixing the push rod (16). The surface of the pin (20) is provided with a lifting plate (29) for limiting the position inside the arc-shaped baffle (10). The interior of the arc-shaped baffle (10) is provided with a limiting groove (28) for sliding the lifting plate (29). The surface of the pin (20) is fitted with a first spring (27) for resetting the pin (20). The bottom of the first spring (27) is in contact with the lifting plate (29), and the top of the first spring (27) is in contact with the bottom wall of the limiting groove (28). The surface of the push rod (16) is provided with equally spaced insertion holes (17) for inserting the pin (20) to prevent the push rod (16) from moving.

7. The tabletop microphone with charging base of claim 1, wherein, The surface of the charging base (6) is connected to a USB charging port (22). The inside of the charging base (6) is provided with a first positioning rod (23) for inserting into the microphone (3), and the inside of the microphone (3) is provided with a positioning hole (25) for inserting the first positioning rod (23). The charging base (6) is provided with a charging port (24) for charging at the center of the surface, and the bottom of the microphone (3) is provided with a charging interface (26) for inserting into the charging port (24).

8. The table microphone with charging base of claim 1, wherein, The first bracket (1) has a support frame (7) for support on the back side of its surface. There is a reinforcing rib (8) for reinforcement between the support frame (7) and the first bracket (1). The support frame (7) has a positioning part (9) for connecting to the table edge on one side of its surface. The support frame (7) and the positioning part (9) have a rotation mechanism at the bottom for driving the first bracket (1), the charging base (6) and the microphone (3). The positioning shaft (33) of the rotation mechanism passes through the positioning part (9) and cooperates with the use of the second bracket (31) to allow the first bracket (1), the charging base (6) and the microphone (3) to rotate to different positions.

9. The tabletop microphone with charging base of claim 1, wherein, The microphone (3) is provided with a dust cover (4) on top for blocking dust, and a switch (5) for turning the microphone (3) on and off is provided on the surface of the microphone (3).

10. The table microphone with charging base of claim 8, wherein, The rotating mechanism includes a base plate (30) connected to the bottom of the second bracket (31), and the base plate (30) is in contact with the support frame (7), the charging base (6), and the first bracket (1). The positioning shaft (33) is connected between the two sets of second brackets (31). The two ends of the positioning shaft (33) pass through the second bracket (31) and are connected to a disc (32). The surface of the positioning shaft (33) is slidably connected to a movable disc (35). The surface of the movable disc (35) is provided with second positioning rods (36) for fixing the positioning part (9) at equal intervals. The surface of the positioning part (9) is provided with positioning grooves for inserting the second positioning rods (36) at equal intervals. The surface of the positioning shaft (33) is sleeved with a second spring (34) for pushing the movable disc (35) between the movable disc (35) and the disc (32).

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