A single-hole buckle for a mobile phone speaker button that is easy to adjust

Abstract

The present invention discloses a single-hole clip for a mobile phone speaker button that is easy to adjust, comprising a speaker body, wherein sound-producing elements are distributed around the speaker body, a control element is connected to one side of the speaker body, and fixing blocks are provided on both sides of the control element, a connecting rod is connected to one side of the fixing block, and an auxiliary block is connected above the connecting rod, and the connecting rod passes through the single-hole clip, and a mounting hole is provided on one side of the single-hole clip. The single-hole clip for a mobile phone speaker button that is easy to adjust has an adjustment mechanism provided inside the single-hole clip, and the snap block can drive the adjustment rubber to slide inside the protective shell, thereby tightly fitting the adjustment rubber to the speaker body, fixing different speaker bodies. After adjustment, the snap block cooperates with the snap groove to complete the fixation of the single-hole clip and the speaker body, which is conducive to adjusting the speaker body that the single-hole clip is suitable for and is convenient for the promotion of the single-hole clip.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile phone speakers, and in particular to a single-hole buckle for a mobile phone speaker button which is easy to adjust. Background Art

[0002] With the advancement of science and technology, mobile phones have become an indispensable part of people's lives. The speaker plays the role of making sounds for mobile phones. The speaker is an electroacoustic component that converts electrical signals into sounds to make sounds for mobile phones. The speaker is composed of sound-generating components, washers, coils and other parts. The control component of the speaker is connected to the external button. By pressing the button, the control component is triggered to adjust the volume of the speaker. There are buckles on both sides of the button to connect the button to the mobile phone. The button buckles are divided into single-hole buckles and double-hole buckles, which are mainly divided into single button hole or two button holes. However, the single-hole buckles on the market still have the following problems:

[0003] 1. The single-hole clips currently on the market need to be intercepted with the speaker during use. The size of the speaker varies depending on the model, and the connecting component of the clip is a fixed size, which cannot adapt to speakers of different sizes. Multiple single-hole clips need to be prepared, which brings inconvenience to the staff and increases the difficulty of promoting the clips.

[0004] 2. Currently, the single-hole clips on the market are mostly connected to the speaker base through various tools such as screws, which makes it very troublesome to disassemble the speaker during maintenance. The entire speaker needs to be disassembled before maintenance can be carried out, and it is also very troublesome for the staff to install the single-hole clip, which is not conducive to the staff's operation.

[0005] In response to the above problems, an innovative design is made based on the original single-hole buckle of the button. Summary of the Invention

[0006] The purpose of the present invention is to provide a single-hole clip for a mobile phone speaker button that is easy to adjust, so as to solve the problem proposed in the above background technology that the single-hole clip on the market currently needs to be intercepted with the speaker during use, and the size of the speaker varies according to different models, and the connecting component of the clip is a fixed size, so it cannot adapt to speakers of different sizes. It is necessary to prepare multiple single-hole clips, which brings inconvenience to the use of staff and increases the difficulty of promoting the clips. The single-hole clip is mostly connected to the speaker base through various tools such as screws, which makes it very troublesome to disassemble the speaker during maintenance. The entire speaker needs to be disassembled for maintenance, and it is also very troublesome for the staff to install the single-hole clip, which is not conducive to the staff's operation.

[0007] To achieve the above object, the present invention provides the following technical solution: a mobile phone speaker button single-hole buckle that is easy to adjust, including a speaker body. Sound-emitting elements are distributed around the speaker body, and a control element is connected to one side of the speaker body. Fixed blocks are provided on both sides of the control element. A connecting rod is connected to one side of the fixed block, and an auxiliary block is connected above the connecting rod. The connecting rod passes through the single-hole buckle. An installation hole is provided on one side of the single-hole buckle, and an adjustment mechanism is provided on one side of the single-hole buckle. Positioning blocks are provided on both sides of the adjustment mechanism. A positioning hole is opened on one side of the positioning block, and a limiting mechanism is provided below the positioning hole. The limiting mechanism is located inside a sliding groove, and the sliding groove is located above the speaker base. An sound outlet is opened at the center of the speaker base.

[0008] Preferably, the adjustment mechanism includes an adjustment rubber, a connecting block, a storage groove, a protective shell, and a clamping block. Connecting blocks are connected to both sides of the adjustment rubber. The connecting blocks are located inside the protective shell. A storage groove is connected above the connecting block. The adjustment rubber is rectangular. Connecting blocks are symmetrically distributed on both sides of the adjustment rubber. The storage groove and the connecting block are connected by hot melting. The connecting block and the protective shell are connected by sliding.

[0009] Preferably, an adjustment groove is opened on one side of the protective shell. A clamping groove is provided on one side of the adjustment groove. A clamping block is provided inside the clamping groove. The clamping grooves are evenly and equidistantly distributed on one side of the protective shell. The sum of the lengths of the clamping grooves is the same as the length of the adjustment groove. The clamping groove and the clamping block are mutually clamped. The clamping block and the storage groove are connected by sliding. The clamping block is in a 冂 shape.

[0010] Preferably, the limiting mechanism includes a limiting block, a limiting rubber, an insertion port, a first spring, and an arc groove. An insertion port is connected inside the limiting block. A limiting rubber is connected to one side of the insertion port. The limiting block is arc-shaped. The width of the limiting block is the same as the width of the insertion port. The insertion port is wider outside and narrower inside. The insertion port and the limiting rubber are integrally installed.

[0011] Preferably, a second spring is connected to one side of the limiting rubber. A penetrating block is provided at the center of the limiting rubber. A first spring is connected to one side of the penetrating block. An arc groove is provided at the center of the limiting rubber. The limiting rubber and the limiting block form a spring reset mechanism through the second spring. The penetrating block and the limiting block form a spring reset mechanism through the first spring. The penetrating block and the limiting rubber are mutually clamped. The radian of the arc groove is the same as the radian of the limiting block.

[0012] Preferably, the center point of the speaker base coincides with the center point of the sound outlet, and sliding grooves are symmetrically distributed above the speaker base, and the sliding grooves are connected to the limit blocks in a sliding manner.

[0013] Preferably, the fixing block is installed in an integrated manner with the protective shell, and connecting rods are symmetrically distributed on both sides of the fixing block, and the connecting rods pass through both sides of the single-hole buckle, and the connection between the connecting rods and the auxiliary block is a sliding connection.

[0014] Preferably, the positioning block is T-shaped and arc-shaped, and the curvature of the positioning block is consistent with the curvature of the limiting block. The width of the positioning block is smaller than the width of the limiting block, and the diameter of the positioning hole at the top of the positioning block is larger than the diameter of the penetrating block inside the limiting block.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the single-hole buckle for the speaker button of a mobile phone that is easy to adjust,

[0016] 1. An adjustment mechanism is provided inside the single-hole buckle. The snap block can drive the adjustment rubber to slide inside the protective shell, so that the adjustment rubber is closely fitted to the speaker body and different speaker bodies are fixed. After the adjustment is completed, the snap block and the snap slot cooperate to complete the fixation of the single-hole buckle and the speaker body, which is conducive to adjusting the speaker body that the single-hole buckle is suitable for and facilitates the promotion of the single-hole buckle.

[0017] 2. Positioning blocks and limit mechanisms are set on both sides of the speaker body. By rotating the speaker body, the positioning blocks are driven to rotate, and the positioning blocks are quickly engaged with the limit grooves. At the same time, the penetration blocks and positioning holes are quickly installed, which is conducive to improving the installation efficiency and facilitating the disassembly of the speaker body and the speaker base by the staff, and facilitating the disassembly and maintenance of the speaker body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall top view of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall front view structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the top view of the limiting mechanism of the present invention;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of a single-hole buckle of the present invention;

[0022] Figure 5 This is a schematic diagram of the top view of the adjustment mechanism of the present invention;

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure of the positioning block of the present invention;

[0024] Figure 7 For the present invention Figure 2 The enlarged structure diagram at A in the middle;

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the connection between the fixing block and the protective shell of the present invention.

[0026] In the figure: 1. Speaker body; 2. Adjustment mechanism; 201. Adjustment rubber; 202. Connecting block; 203. Storage slot; 204. Protective shell; 205. Engaging slot; 206. Adjustment slot; 207. Engaging block; 3. Limiting mechanism; 301. Limiting block; 302. Limiting rubber; 303. Insertion port; 304. First spring; 305. Penetrating block; 306. Second spring; 307. Arc groove; 4. Speaker base; 5. Fixing block; 6. Control element; 7. Mounting hole; 8. Single-hole buckle; 9. Connecting rod; 10. Auxiliary block; 11. Sounding element; 12. Positioning block; 13. Positioning hole; 14. Sound outlet; 15. Sliding slot. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-8, the present invention provides a mobile phone speaker button single-hole buckle that is easy to adjust, including a speaker main body 1. In order to quickly adjust the adaptability of the single-hole buckle 8, sound-emitting elements 11 are distributed around the speaker main body 1, and a control element 6 is connected to one side of the speaker main body 1. Fixed blocks 5 are provided on both sides of the control element 6. A connecting rod 9 is connected to one side of the fixed block 5, and an auxiliary block 10 is connected above the connecting rod 9. The connecting rod 9 passes through the single-hole buckle 8. An installation hole 7 is provided on one side of the single-hole buckle 8, and an adjustment mechanism 2 is provided on one side of the single-hole buckle 8. The adjustment mechanism 2 includes an adjustment rubber 201, a connecting block 202, a storage groove 203, a protective shell 204, and a clamping block 207. Connecting blocks 202 are connected to both sides of the adjustment rubber 201. The connecting blocks 202 are located inside the protective shell 204. A storage groove 203 is connected above the connecting block 202. The adjustment rubber 201 is rectangular. Connecting blocks 202 are symmetrically distributed on both sides of the adjustment rubber 201. The connection method between the storage groove 203 and the connecting block 202 is heat fusion connection. The connection method between the connecting block 202 and the protective shell 204 is sliding connection. An adjustment groove 206 is provided on one side of the protective shell 204. A clamping groove 205 is provided on one side of the adjustment groove 206. A clamping block 207 is provided inside the clamping groove 205. The clamping grooves 205 are evenly and equidistantly distributed on one side of the protective shell 204. The sum of the lengths of the clamping grooves 205 is the same as the length of the adjustment groove 206. The clamping groove 205 and the clamping block 207 are mutually clamped. The connection method between the clamping block 207 and the storage groove 203 is sliding connection. The clamping block 207 is in the shape of a "冂". The fixed block 5 and the protective shell 204 are integrally installed. Connecting rods 9 are symmetrically distributed on both sides of the fixed block 5. The connecting rods 9 pass through both sides of the single-hole buckle 8. The connection method between the connecting rod 9 and the auxiliary block 10 is sliding connection. The single-hole buckle 8 and the protective shell 204 are connected through the fixed block 5. The thickness of the protective shell 204 is adjusted through the adjustment rubber 201 inside the protective shell 204, so as to ensure that the adjustment mechanism 适用于不同大小的喇叭主体1, and the purpose of improving the adaptability of the single-hole buckle 8 is achieved. The adjustment mechanism 2 includes an adjustment rubber 201, a connecting block 202, a storage groove 203, a protective shell 204, and a clamping block 207. Connecting blocks 202 are connected to both sides of the adjustment rubber 201. The connecting blocks 202 are located inside the protective shell 由204. A storage groove 203 is connected above the connecting block 202. The adjustment rubber 201 is rectangular. Connecting blocks 202 are symmetrically distributed on both sides of the adjustment rubber 201. The connection method between the storage groove 203 and the connecting block 202 is heat fusion connection. The connection method between the connecting block 202 and the protective shell 204 is sliding connection. It is beneficial to change the length of the protective shell 204 through the adjustment rubber 201, so as to be suitable for speaker main bodies 1 of different sizes. An adjustment groove 206 is provided on one side of the protective shell 204. A clamping groove 205 is provided on one side of the adjustment groove 206. A clamping block 207 is provided inside the clamping groove 205. It should be noted that there are some inaccuracies or unclear expressions in the original text, such as "适用于不同大小的喇叭主体1" which may need to be more precisely described in the original Chinese. The above translation is based on the existing text as accurately as possible.One side of the protective housing 204 is evenly and equidistantly provided with snap-fit ​​grooves 205. The sum of the lengths of the snap-fit ​​grooves 205 matches the length of the adjustment groove 206. The snap-fit ​​grooves 205 engage with the snap-fit ​​block 207. The snap-fit ​​block 207 is connected to the storage slot 203 by a sliding connection. The snap-fit ​​block 207 is in a U-shaped shape, which facilitates the fixing of the protective housing 204 and the adjustment rubber 201, making it easier for the operator to operate. The fixing block 5 is integrally mounted with the protective housing 204. Connecting rods 9 are symmetrically distributed on both sides of the fixing block 5. The connecting rods 9 pass through both sides of the single-hole buckle 8. The connecting rods 9 are connected to the auxiliary block 10 by a sliding connection, which facilitates the fixing of the single-hole buckle 8 and the protective housing 204, and facilitates the control of the volume of the speaker body 1.

[0029] See also Figure 1-6The present invention provides a single-hole buckle for a mobile phone speaker button that is easy to adjust. In order to quickly fix the speaker body 1 and the speaker base, positioning blocks 12 can be provided on both sides of the adjustment mechanism 2. A positioning hole 13 is provided on one side of the positioning block 12, and a limiting mechanism 3 is provided below the positioning hole 13. The limiting mechanism 3 is located inside the sliding groove 15, and the sliding groove 15 is located above the speaker base 4, and a sound outlet 14 is provided at the center of the speaker base 4. The limiting mechanism 3 includes a limiting block 301, a limiting rubber 302, an insertion port 303, a first spring 304 and an arc groove 307. The interior of the limiting block 301 is connected to the insertion port 303, and one side of the insertion port 303 is connected to the limiting rubber 302. The limiting block 301 is arc-shaped, and the limiting block 301 is The width is consistent with the width of the insertion port 303, the insertion port 303 is wide outside and narrow inside, the insertion port 303 and the limiting rubber 302 are installed in an integrated manner, one side of the limiting rubber 302 is connected to the second spring 306, the center of the limiting rubber 302 is provided with a penetration block 305, one side of the penetration block 305 is connected to the first spring 304, the center of the limiting rubber 302 is provided with an arc groove 307, the limiting rubber 302 forms a spring return mechanism with the limiting block 301 through the second spring 306, the penetration block 305 forms a spring return mechanism with the limiting block 301 through the first spring 304, the penetration block 305 and the limiting rubber 302 are engaged with each other, the curvature of the arc groove 307 is consistent with the curvature of the limiting block 301, the center point of the speaker base 4 is aligned with the sound outlet 14 The center points coincide with each other, and sliding grooves 15 are symmetrically distributed above the speaker base 4, and the connection mode of the sliding groove 15 and the limit block 301 is a sliding connection. The positioning block 12 is T-shaped, and the positioning block 12 is arc-shaped, and the curvature of the positioning block 12 is consistent with the curvature of the limit block 301. The width of the positioning block 12 is smaller than the width of the limit block 301, and the diameter of the positioning hole 13 at the top of the positioning block 12 is larger than the diameter of the penetration block 305 inside the limit block 301. The positioning block 12 is tightly fitted in the interior of the arc groove 307 by cooperating with the limiting rubber 302, and the positioning hole 13 is penetrated by the penetration block 305, thereby performing secondary limiting on the positioning block 12 to complete the limiting of the speaker body 1. The limiting mechanism 3 includes the limiting block 3 01, limiting rubber 302, insertion port 303, first spring 304 and arc groove 307, the interior of the limiting block 301 is connected with the insertion port 303, one side of the insertion port 303 is connected to the limiting rubber 302, the limiting block 301 is arc-shaped, the width of the limiting block 301 is consistent with the width of the insertion port 303, the insertion port 303 is wide outside and narrow inside, the insertion port 303 and the limiting rubber 302 are installed in an integrated manner, which is conducive to the positioning block 12 automatically sliding into the interior of the limiting block 301, so as to improve the fixing efficiency, one side of the limiting rubber 302 is connected to the second spring 306, the center of the limiting rubber 302 is provided with a penetration block 305, one side of the penetration block 305 is connected to the first spring 304, and the center of the limiting rubber 302 is provided with an arc groove 307,The limiting rubber 302 forms a spring return mechanism with the limiting block 301 through the second spring 306, and the penetrating block 305 forms a spring return mechanism with the limiting block 301 through the first spring 304. The penetrating block 305 and the limiting rubber 302 are engaged with each other. The curvature of the arc groove 307 is consistent with the curvature of the limiting block 301, which is convenient for multiple fixation of the positioning block 12 and is conducive to completing the fixation of the speaker body 1. The center point of the speaker base 4 coincides with the center point of the sound outlet 14, and the sliding grooves 15 are symmetrically distributed above the speaker base 4. The connection between the sliding groove 15 and the limit block 301 is a sliding connection, which facilitates the change of the position of the limit block 301 and improves the adaptability of the limit mechanism 3. The positioning block 12 is T-shaped and arc-shaped, and the curvature of the positioning block 12 is consistent with the curvature of the limit block 301. The width of the positioning block 12 is smaller than the width of the limit block 301, and the diameter of the positioning hole 13 at the top of the positioning block 12 is larger than the diameter of the penetrating block 305 inside the limit block 301. This facilitates the cooperation of the limit block 301 and facilitates the above-mentioned work.

[0030] Working principle: According to Figure 1-8 First, change the size of the adjusting rubber 201 according to the size of the speaker body 1, fit the protective shell 204 on the surface of the speaker body 1, and drive the receiving groove 203 to move through the snap block 207, so that the receiving groove 203 drives the adjusting rubber 201 to move through the connecting block 202. When the snap block 207 slides to the appropriate position inside the adjusting groove 206 (the adjusting rubber 201 fits tightly against the speaker body 1), snap the snap groove 205 into the inside of the snap groove 205 on one side to complete the preliminary limit of the speaker body 1. Then, insert the two sides of the single-hole buckle 8 into the two sides of the connecting rod 9, and then complete the installation of the auxiliary block 10 and the connecting rod 9. Limit the single-hole buckle 8 and install the mobile phone button inside the mounting hole 7.

[0031] according to Figure 1-6, place the speaker body 1 at the sound outlet 14 position in the center of the mounting base 4, rotate the speaker body 1, and the speaker body 1 drives the protective shell 204 to rotate during the rotation process, thereby driving the positioning block 12 to rotate. The positioning block 12 contacts the inside of the insertion port 303 during the rotation process, thereby sliding into the inside of the arc groove 307, and driving the limit block 301 to slide inside the sliding groove 15 during the sliding process, so that the limit block 301 is in a suitable position. At the same time, when the positioning block 12 slides into the inside of the arc groove 307, the second spring 306 squeezes the limit rubber 302, so that the limit rubber 302 is tightly attached. The positioning block 12 is closed, and the positioning hole 13 squeezes the penetration block 305 during the sliding process. When the positioning block 12 stops sliding, the positioning hole 13 also stops sliding. The first spring 304 drives the penetration block 305 to reset, so that the penetration block 305 is inserted into the positioning hole 13 for secondary limiting. When disassembly and maintenance are required, the speaker body 1 is reversed. During the reversal of the speaker body 1, the protective shell 204 is driven to disengage the positioning block 12 from the limit block 301. The above is the working process of the entire device, and the contents not described in detail in this manual belong to the existing technology known to professional and technical personnel in this field.

[0032] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A single-hole clip for a mobile phone speaker button that is easy to adjust, comprising a speaker body (1), characterized in that: The sound-emitting elements (11) are distributed around the horn body (1), and a control element (6) is connected to one side of the horn body (1). Fixed blocks (5) are provided on both sides of the control element (6). A connecting rod (9) is connected to one side of the fixed block (5), and an auxiliary block (10) is connected above the connecting rod (9). The connecting rod (9) passes through a single-hole buckle (8). An installation hole (7) is provided on one side of the single-hole buckle (8), and an adjusting mechanism (2) is provided on one side of the single-hole buckle (8). Positioning blocks (12) are provided on both sides of the adjusting mechanism (2). A positioning hole (13) is formed on one side of the positioning block (12), and a limiting mechanism (3) is provided below the positioning hole (13). The limiting mechanism (3) is located inside a sliding groove (15), and the sliding groove (15) is located above the horn base (4). An sound outlet (14) is formed at the center of the horn base (4). The adjusting mechanism (2) includes an adjusting rubber (201), a connecting block (202), a receiving groove (203), a protective housing (204), and a clamping block (207). Connecting blocks (202) are connected to both sides of the adjusting rubber (201). The connecting blocks (202) are located inside the protective housing (204). A receiving groove (203) is connected above the connecting block (202). The adjusting rubber (201) is rectangular. The connecting blocks (202) are symmetrically distributed on both sides of the adjusting rubber (201). The receiving groove (203) and the connecting block (202) are connected by hot melting. The connecting block (202) and the protective housing (204) are connected by sliding connection.

2. The single-hole clip for a mobile phone speaker button that is easily adjustable according to claim 1, characterized in that: An adjusting groove (206) is formed on one side of the protective housing (204). A clamping groove (205) is provided on one side of the adjusting groove (206). A clamping block (207) is provided inside the clamping groove (205). The clamping grooves (205) are evenly and equidistantly distributed on one side of the protective housing (204). The length of the clamping groove (205) is the same as the length of the adjusting groove (206). The clamping groove (205) and the clamping block (207) are mutually clamped. The clamping block (207) and the receiving groove (203) are connected by sliding connection. The clamping block (207) is in a shape of 冂.

3. The single-hole clip for the easily adjustable speaker button of a mobile phone according to claim 1, characterized in that: The limiting mechanism (3) includes a limiting block (301), a limiting rubber (302), an insertion port (303), a first spring (304), and an arc-shaped groove (307). An insertion port (303) is connected inside the limiting block (301). A limiting rubber (302) is connected to one side of the insertion port (303). The limiting block (301) is arc-shaped. The width of the limiting block (301) is the same as the width of the insertion port (303). The insertion port (303) is wider outside and narrower inside. The insertion port (303) and the limiting rubber (302) are integrally installed.

4. The single-hole clip for the easily adjustable speaker button of a mobile phone according to claim 3, characterized in that: One side of the limiting rubber (302) is connected to a second spring (306), a penetration block (305) is provided at the center of the limiting rubber (302), one side of the penetration block (305) is connected to a first spring (304), an arc groove (307) is provided at the center of the limiting rubber (302), the limiting rubber (302) forms a spring return mechanism with the limiting block (301) through the second spring (306), the penetration block (305) forms a spring return mechanism with the limiting block (301) through the first spring (304), the penetration block (305) and the limiting rubber (302) are engaged with each other, and the curvature of the arc groove (307) is consistent with the curvature of the limiting block (301).

5. The single-hole clip for the easily adjustable speaker button of a mobile phone according to claim 3, characterized in that: The center point of the speaker base (4) coincides with the center point of the sound outlet (14), and sliding grooves (15) are symmetrically distributed above the speaker base (4), and the connection mode of the sliding grooves (15) and the limiting block (301) is a sliding connection.

6. The single-hole clip for the easily adjustable speaker button of a mobile phone according to claim 1, characterized in that: The fixing block (5) and the protective shell (204) are installed in an integrated manner, and connecting rods (9) are symmetrically distributed on both sides of the fixing block (5), and the connecting rods (9) pass through both sides of the single-hole buckle (8), and the connection mode of the connecting rods (9) and the auxiliary block (10) is a sliding connection.

7. The single-hole clip for the easily adjustable speaker button of a mobile phone according to claim 3, characterized in that: The positioning block (12) is T-shaped and arc-shaped, and the arc of the positioning block (12) is consistent with the arc of the limiting block (301). The width of the positioning block (12) is smaller than the width of the limiting block (301), and the diameter of the positioning hole (13) at the top of the positioning block (12) is larger than the diameter of the penetrating block (305) inside the limiting block (301).

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