Split type quick connection structure of metal button

Abstract

The invention relates to the technical field of switches, and discloses a split type quick connection structure of a metal button, which comprises a shell and a base, the shell and the base are both in a circular ring shape, the outer diameter of the base is smaller than the inner diameter of the shell, a plurality of limiting blocks are arranged on the outer side wall of the base, the base partially extends into the shell, and the limiting blocks are arranged on the outer side wall of the base. The side wall of the shell is provided with a plurality of limiting grooves used for allowing the limiting blocks to stretch in, the limiting blocks are provided with guide slopes, the inner wall of the shell is provided with a limiting ring, the side wall, facing the base, of the limiting ring is provided with a plurality of limiting pieces, the limiting pieces are provided with hook claws, and the hook claws are connected with the limiting rings. A mounting groove for the base to extend into is formed among the limiting piece, the limiting ring and the shell, and a plurality of hook grooves for the hook claws to extend into are formed in the base. According to the metal button, the hook claw is arranged in the shell, and the hook claw performs secondary locking on the base, so that the connection stability of the base and the shell is improved, and the anti-loosening effect of the metal button is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of switches, and in particular to a split quick-connect structure of a metal button. Background Art

[0002] A metal button is an electronic component that switches a circuit on or off or switches functions through mechanical pressure. Its working principle is to use a button to push a transmission mechanism to connect or disconnect the moving contact and the static contact, thereby switching the circuit.

[0003] In related technologies, such as Figure 1 and Figure 2 The disclosed metal button primarily comprises a housing 1 and a base 2, as well as a button cap 3, a push mechanism 4, contacts 5, and pins 6 disposed within the housing 1 and base 2. The pins 6 are used to connect the internal contacts 5 to an external circuit. The housing 1 and base 2 are both annular, with the outer diameter of the base 2 being smaller than the inner diameter of the housing 1. Several stoppers 213 are provided on the outer wall of the base 2. The base 2 partially extends into the housing 1. The sidewalls of the housing 1 are provided with several stopper slots 12 for the stopper blocks 213 to extend into. The stopper blocks 213 are provided with guide ramps 214 that guide the stopper blocks 213 into the stopper slots 12. When the housing 1 and base 2 are connected, the stopper blocks 213 extend into the stopper slots 12, enabling a quick connection between the housing 1 and base 2.

[0004] However, the shell 1 and base 2 of the above-mentioned metal button are connected by the limit block 213 and the limit groove 12. If the limit block 213 becomes loose or damaged after long-term use and falls out of the limit groove 12, the shell 1 and the base 2 will be separated, and the metal button will not be able to be used normally. Therefore, it needs to be improved. Summary of the Invention

[0005] In order to improve the connection stability between the housing and the base, the present application provides a split quick-connect structure for a metal button.

[0006] The present application provides a split quick-connect structure for a metal button using the following technical solutions: A split quick-connect structure for a metal button comprises a shell and a base, the shell and the base are both annular, and the outer diameter of the base is smaller than the inner diameter of the shell, a plurality of limit blocks are provided on the outer wall of the base, the base partially extends into the shell, a plurality of limit grooves for the limit blocks to extend into are provided on the side wall of the shell, the limit blocks are provided with a guide slope, and the guide slope is inclined along the direction in which the limit blocks extend into the limit grooves, a limit ring is provided on the inner wall of the shell, a plurality of limit plates are provided on the side wall of the limit ring facing the base, a hook claw is provided on the limit plate, an installation groove for the base to extend into is formed between the limit plate, the limit ring and the shell, and a plurality of hook grooves for the hook claws to extend into are provided on the base.

[0007] By adopting the above technical solution, when the base needs to be connected to the shell, it is only necessary to first extend the base into the shell so that the base is located in the installation groove and the limit block is extended into the limit groove. At this time, the hook claw will also be extended into the hook groove simultaneously, thereby performing a secondary locking on the base. Even if the limit block is worn or loose after the metal button has been used for a long time, the hook claw can fix the base, making it difficult for the base to separate from the shell, which is conducive to ensuring the normal operation of the metal button.

[0008] After the base is inserted into the mounting slot, it is secured on both sides by hooks and limit blocks, respectively, preventing the base from rocking left and right or up and down relative to the housing, thus improving the vibration-proofing of the metal button. A limit ring, located on the side of the base closest to the housing, limits the maximum length the base can extend into the housing, preventing the base from extending too deeply into the housing and causing the limit blocks to move out of the limit slot, thus preventing the base from separating from the housing and improving the stability of the connection between the housing and the base.

[0009] Optionally, a plurality of sliding holes are provided on the shell. When the base is extended into the shell, the sliding hole is connected to the hook groove. A first slider is slidingly provided in the hook groove. The length of the first slider along the direction in which the hook claw extends into the hook groove is not less than the length of the hook groove. A second slider is slidingly provided in the sliding hole. The length of the second slider along the direction in which the second slider slides in the sliding hole is not less than the length of the sliding hole.

[0010] By adopting the above technical solution, when the base is connected to the housing, the hook claw will extend into the hook groove, thereby pushing the first slider into the sliding hole, and then the first slider pushes the second slider out of the sliding hole, causing the second slider to slide out of the housing. When the operator observes the second slider extending out of the housing and the limit block extending into the limit groove, it means that the hook claw has entered the hook groove, that is, the base and the housing have been locked for the second time. At this time, the base and the housing are firmly connected, and the first and second sliders can indicate the position of the hook claw. When the hook claw needs to be moved out of the hook groove, it is only necessary to push the second slider in the direction close to the base, so that the second slider pushes the first slider to slide away from the housing, and then the second slider pushes the hook claw out of the hook groove, which is easy to operate.

[0011] Optionally, a first sliding groove is provided on the groove wall of the hook groove, and a second sliding groove is provided on the hole wall of the sliding hole. The first sliding block includes a sliding portion slidably arranged in the first sliding groove and a mounting portion slidably arranged in the hook groove. The width of the sliding portion in the direction in which the base extends into the shell is greater than the width of the hook groove. The second sliding block includes a movable portion slidably arranged in the second sliding groove and a fixed portion slidably arranged in the sliding hole. The width of the movable portion in the direction in which the base extends into the shell is greater than the aperture of the sliding hole.

[0012] By adopting the above technical solution, when the second slider is pushed, the movable part will slide in the second sliding groove, the sliding part will slide in the first sliding groove, and the groove wall of the second sliding groove will hinder the movable part from moving out of the second sliding groove, thereby hindering the second slider from moving out of the sliding hole, and the groove wall of the first sliding groove will hinder the sliding part from moving out of the first sliding groove, thereby hindering the first slider from moving out of the hook groove, thereby reducing the risk of the first slider detaching from the hook groove when the second slider is pushed, improving the connection stability between the first slider and the base, and the second slider and the shell, and having a good anti-detachment effect, thereby ensuring the first slider and the second slider can indicate the position of the hook claw.

[0013] Optionally, an extension block is slidably arranged in the limit groove, and the length of the extension block along the direction in which the limit block extends into the limit groove is not less than the length of the limit groove. The limit plate and the limit block can undergo elastic deformation, and a pressing cover is provided at the end of the fixed part away from the base, and the pressing cover includes a pushing part connected to the fixed part and an extrusion part connected to the extension block.

[0014] By adopting the above technical solution, when the base needs to be separated from the shell, the pressing cover can be pressed toward the base first, so that the pressing cover pushes the second slider to slide in the sliding hole, and the second slider pushes the first slider to slide in the hook groove, and then the first slider pushes the hook claw out of the hook groove. At this time, the hook claw no longer limits the base. As the pressing cover moves toward the base, the extension block moves in the limit groove toward the limit block, so that the limit block is squeezed and deformed and moves out of the limit groove, so that the limit block no longer limits the base. At this time, the base can be removed from the shell. The operation is simple. Only the pressing cover needs to be operated to unlock the limit blocks and the hook claws, making it easy to separate the base from the shell. Furthermore, damaged parts inside the metal button can be repaired or replaced without replacing the entire metal button, which facilitates the inspection of the internal components of the metal button and extends the service life of the metal button.

[0015] Optionally, a plurality of accommodating grooves are provided on the outer side wall of the base, a connecting spring is provided in the accommodating groove, the limiting block is provided at one end of the connecting spring, and the connecting spring has a tendency to drive the limiting block into the limiting groove.

[0016] By adopting this technical solution, when the ambient temperature is too low and the metal button contracts, the connecting spring can compensate for the distance the limit block retracts into the accommodating groove due to this contraction, thereby pushing the limit block toward the limit groove, ensuring that the limit block always remains in place in the limit groove, thereby maintaining the base in place and further improving the stability of the connection between the base and the housing. In addition, when the metal button vibrates, the connecting spring can also absorb the shaking caused by the vibration, preventing the limit block from deflecting, thereby improving the shock absorption effect of the metal button.

[0017] Optionally, a cleaning pad is provided at one end of the base close to the shell, the cleaning pad abuts against the groove wall of the installation groove, and the cleaning pad can undergo elastic deformation.

[0018] By adopting the above technical solution, when the base is removed from the mounting slot, the cleaning pad will simultaneously sweep out the dust accumulated in the mounting slot, making it difficult for impurities to accumulate on the slot walls of the mounting slot. This ensures that each time the base is inserted into the housing, the limit block can accurately extend into the limit slot and the hook claw can also accurately extend into the hook slot, thereby stably connecting the base to the housing. When the base is connected to the housing, the cleaning pad deforms and abuts between the base and the slot wall of the mounting slot, preventing the base from shaking relative to the slot wall, thereby making the connection between the base and the housing more stable.

[0019] Optionally, a plurality of paving grooves for the limiting blocks to extend into are opened on the inner side wall of one end of the shell close to the base, and the paving grooves extend along the side wall of the shell close to the base to the groove wall of the limiting groove.

[0020] By adopting the above technical solution, when the base is extended into the shell, the limit block will first abut against the groove wall of the positioning groove, and then when the base and the shell are connected in place, the limit block extends into the limit groove. Compared with the limit block directly abutting against the vertical inner wall of the shell, it is not easy to cause the limit block to be excessively squeezed and deformed, which facilitates the limit block to enter the limit groove and limit the base.

[0021] Optionally, a fixing groove is opened on the circumferential direction of the outer wall of the base, the limit block is arranged on the groove wall of the fixing groove, a plurality of positioning blocks are provided on the groove wall of the fixing groove, and a plurality of positioning grooves are opened on the side wall of the shell. When the shell is connected to the base, the shell extends into the fixing groove and the positioning block extends into the positioning groove.

[0022] By adopting the above technical solution, when the base is inserted into the shell, the positioning block will extend into the positioning groove, thereby pre-positioning the connection position between the base and the shell. Therefore, after the base and the shell are connected in place, the limiting block can accurately enter the limiting groove and the hook claw can accurately enter the hook groove, thereby connecting the base and the shell. The shell extends into the fixing groove and fits with the groove wall of the fixing groove, increasing the contact area between the shell and the base, thereby further improving the stability of the connection between the base and the shell.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By providing a limiting plate on the limiting ring and a hook on the limiting plate, the hook extends into the hook groove during connection, thereby performing a secondary locking on the base, thereby improving the connection stability between the base and the shell; 2. The limit block can be removed from the housing and the hook can be removed from the base, so that the base can be separated from the housing, making it easier to inspect or replace the internal components of the metal button; 3. The positioning block can be inserted into the positioning groove to pre-position the connection position between the base and the shell, so as to ensure that the limit block is inserted into the limit groove and the hook claw is inserted into the hook groove, thereby connecting the base and the shell together. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a metal button in the prior art.

[0025] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of a metal button in the prior art.

[0026] Figure 3 It is an overall structural diagram of an embodiment of the present application.

[0027] Figure 4 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0028] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0029] Description of reference numerals: 1. Housing; 11. Positioning slot; 12. Limiting slot; 121. Extension block; 13. Giving slot; 14. Limiting ring; 15. Limiting plate; 16. Hook; 17. Mounting slot; 18. Sliding hole; 181. Second slide slot; 19. Second slider; 191. Movable portion; 192. Fixed portion; 2. Base; 21. Fixed slot; 211. Accommodating slot; 212. Connecting spring; 213. Limiting block; 214. Guide slope; 22. Positioning block; 23. Hooking slot; 231. First slide slot; 24. Cleaning pad; 25. First slider; 251. Sliding portion; 252. Mounting portion; 3. Button cap; 4. Pushing mechanism; 5. Contact; 6. Pin; 7. Press cover; 71. Pushing portion; 72. Extrusion portion. DETAILED DESCRIPTION

[0030] The following is combined with Figure 3-5 This application is described in further detail.

[0031] The embodiments of the present application disclose a split quick-connect structure for a metal button.

[0032] Reference Figure 3 and Figure 4 A split-type quick-connect structure for a metal button includes a housing 1 and a base 2, a button cap 3 disposed within the housing 1 and base 2, a push mechanism 4, contacts 5, and pins 6. Pins 6 connect the internal contacts 5 to an external circuit. The contacts 5 include a movable contact and a stationary contact. The push mechanism 4 connects or disconnects the movable and stationary contacts to connect or disconnect the circuit.

[0033] Reference Figure 3 Both the housing 1 and the base 2 are annular, with the outer diameter of the base 2 being smaller than the inner diameter of the housing 1. When the base 2 is connected to the housing 1, the base 2 partially extends into the housing 1. A fixing groove 21 for the housing 1 to extend into is defined on the outer wall of the base 2. The fixing groove 21 has a plurality of positioning blocks 22 disposed on its walls. The sidewall of the housing 1 has a plurality of positioning grooves 11 for the positioning blocks 22 to extend into. When the base 2 is connected to the housing 1, the positioning blocks 22 first extend into the positioning grooves 11, thereby pre-positioning the connection between the base 2 and the housing 1.

[0034] Reference Figure 4The wall of the fixing groove 21 is provided with a plurality of receiving grooves 211. A connecting spring 212 is fixed in the receiving groove 211. One end of the connecting spring 212 is fixed to the wall of the receiving groove 211, and the other end is connected to a limit block 213. The limit block 213 is elastically deformable and has a guide slope 214. The side wall of the housing 1 is provided with a plurality of limit grooves 12 for the limit blocks 213 to extend into. The guide slope 214 is inclined in the direction in which the limit blocks 213 extend into the limit grooves 12. The connecting spring 212 has a tendency to drive the limit blocks 213 into the limit grooves 12. The connecting spring 212 can absorb shaking caused by vibration, making it less likely for the limit blocks 213 to deviate, thereby facilitating the fixation of the limit blocks 213 to the base 2.

[0035] Reference Figure 4 The end of the housing 1 near the base 2 is provided with a plurality of clearance grooves 13 on the inner side wall for the limit block 213 to extend into. The clearance grooves 13 extend along the side wall of the housing 1 near the base 2 to the groove wall of the limit groove 12. The provision of the clearance grooves 13 ensures that the groove wall of the limit groove 12 near the base 2 is shorter than the groove wall away from the base 2. Through the above arrangement, when the base 2 extends into the housing 1, the limit block 213 extends out of the receiving groove 211 and slides in the clearance groove 13, making it difficult for the limit block 213 to be squeezed excessively by the side wall of the housing 1 and deformed. At the same time, the connecting spring 212 will also deform a certain distance first. Then, when the base 2 moves to the position where the receiving groove 211 and the limit groove 12 are opposite, the connecting spring 212 continues to deform and pushes the limit block 213 into the limit groove 12. This makes it difficult for the connecting spring 212 to be suddenly deformed excessively and cause elastic fatigue, which is conducive to protecting the connecting spring 212 from damage.

[0036] Reference Figure 4 A limiting ring 14 is provided on the inner wall of the housing 1. The limiting ring 14 is used to limit the maximum distance that the base 2 can extend into the housing 1. A plurality of limiting plates 15 are provided on the side wall of the limiting ring 14 facing the base 2. The limiting plates 15 can undergo elastic deformation. A hook 16 is provided on the end of the limiting plate 15 close to the base 2. The limiting plates 15, the limiting ring 14, and the housing 1 together form a mounting groove 17 for the base 2 to extend into. The base 2 is provided with a plurality of hook grooves 23 for the hook 16 to extend into. The hook grooves 23 pass through two groove walls perpendicular to the direction in which the base 2 extends into the housing 1. A cleaning pad 24 is provided on the end of the base 2 close to the housing 1. The cleaning pad 24 can undergo elastic deformation and abut against the groove wall of the mounting groove 17. The cleaning pad 24 has a good vibration-proof effect.

[0037] Reference Figure 4 Through the above arrangement, when the base 2 extends into the housing 1, the base 2 is not only fixed by the limit block 213, but also locked for the second time by the hook 16, thereby improving the connection strength between the base 2 and the housing 1.

[0038] Reference Figure 5 A first sliding groove 231 is provided on the groove wall of the hook groove 23, a plurality of sliding holes 18 communicating with the hook groove 23 are provided on the shell 1, a second sliding groove 181 is provided on the hole wall of the sliding hole 18, a first slider 25 is slidably provided in the hook groove 23, the first slider 25 includes a sliding portion 251 slidably provided in the first sliding groove 231, and a mounting portion 252 slidably provided in the hook groove 23, the width of the sliding portion 251 along the direction in which the base 2 extends into the shell 1 is greater than the width of the hook groove 23, and the length of the mounting portion 252 along the direction in which the hook claw 16 extends into the hook groove 23 is not less than the length of the hook groove 23.

[0039] Reference Figure 4 and Figure 5 A second slider 19 is slidably arranged in the sliding hole 18. The second slider 19 includes a movable portion 191 slidably arranged in the second sliding groove 181 and a fixed portion 192 slidably arranged in the sliding hole 18. The width of the movable portion 191 in the direction in which the base 2 extends into the housing 1 is greater than the aperture of the sliding hole 18. The length of the fixed portion 192 along the sliding direction in the sliding hole 18 is not less than the length of the sliding hole 18, and a pressing cover 7 is provided at the end of the fixed portion 192 away from the base 2.

[0040] Reference Figure 4 and Figure 5 With the above arrangement, the second slider 19 can push the first slider 25 to slide, thereby pushing the hook 16 out of the hook groove 23. Furthermore, since the movable portion 191 of the second slider 19 is restrained in the second slide groove 181, the second slider 19 is not easily disengaged from the sliding hole 18. Furthermore, since the sliding portion 251 of the first slider 25 is restrained in the first slide groove 231, the first slider 25 is not easily disengaged from the hook groove 23.

[0041] Reference Figure 5 An extension block 121 is slidably disposed in the limiting groove 12, and the length of the extension block 121 extending into the limiting groove 12 along the direction in which the limiting block 213 extends is not less than the length of the limiting groove 12. The pressing cover 7 includes a pushing portion 71 connected to the fixing portion 192 and a pressing portion 72 connected to the extension block 121. When the base 2 is connected to the housing 1, the limiting block 213 extends into the limiting groove 12 and abuts against the extension block 121.

[0042] In this embodiment, the number of the limiting groove 12, the limiting block 213, the positioning block 22, the positioning groove 11, the accommodating groove 211, the giving groove 13, the limiting plate 15, the hook groove 23, and the sliding hole 18 are preferably 2 and one-to-one corresponding. In other cases, other specific numbers can also be selected according to customer needs.

[0043] The implementation principle of the split quick-connect structure of a metal button in the embodiment of the present application is: when the base 2 and the shell 1 need to be connected, the base 2 only needs to be extended into the shell 1, so that the limit block 213 extends into the limit groove 12 and the hook claw 16 extends into the hook groove 23. When the hook claw 16 extends into the hook groove 23, it will push the first slider 25 in the direction close to the second slider 19, so that the second slider 19 extends out of the shell 1, indicating that the base 2 and the shell 1 are connected in place, so that the connection stability of the base 2 and the shell 1 is high.

[0044] When the base 2 needs to be separated from the shell 1, it is only necessary to press the pressing cover 7 toward the shell 1 so that the extension block 121 pushes the limit block 213 out of the limit groove 12 and the first slider 25 pushes the hook claw 16 out of the hook groove 23. The operation is simple and convenient for inspecting or replacing the internal components of the metal button.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A split quick-connect structure for a metal button, comprising a housing (1) and a base (2), wherein the housing (1) and the base (2) are both annular, and the outer diameter of the base (2) is smaller than the inner diameter of the housing (1), a plurality of limit blocks (213) are provided on the outer wall of the base (2), and the base (2) partially extends into the housing (1), and a plurality of limit grooves (12) for the limit blocks (213) to extend into are provided on the side wall of the housing (1), and a guide slope (214) is provided on the limit block (213), and the guide slope (214) is inclined along the direction in which the limit block (213) extends into the limit groove (12), characterized in that: A limiting ring (14) is provided on the inner wall of the housing (1), a plurality of limiting plates (15) are provided on the side wall of the limiting ring (14) facing the base (2), a hook claw (16) is provided on the limiting plate (15), a mounting groove (17) for the base (2) to extend into is formed between the limiting plate (15), the limiting ring (14) and the housing (1), and a plurality of hook grooves (23) for the hook claws (16) to extend into are formed on the base (2).

2. The split quick-connect structure of a metal button according to claim 1, characterized in that: The housing (1) is provided with a plurality of sliding holes (18). When the base (2) is inserted into the housing (1), the sliding holes (18) are communicated with the hook groove (23). A first slider (25) is slidably arranged in the hook groove (23). The length of the first slider (25) along the direction in which the hook claw (16) extends into the hook groove (23) is not less than the length of the hook groove (23). A second slider (19) is slidably arranged in the sliding hole (18). The length of the second slider (19) along the direction in which the second slider (19) slides in the sliding hole (18) is not less than the length of the sliding hole (18).

3. The split quick-connect structure of a metal button according to claim 2, characterized in that: A first sliding groove (231) is provided on the groove wall of the hook groove (23), and a second sliding groove (181) is provided on the hole wall of the sliding hole (18). The first slider (25) includes a sliding portion (251) slidably arranged in the first sliding groove (231) and a mounting portion (252) slidably arranged in the hook groove (23). The width of the sliding portion (251) in the direction in which the base (2) extends into the shell (1) is greater than the width of the hook groove (23). The second slider (19) includes a movable portion (191) slidably arranged in the second sliding groove (181) and a fixed portion (192) slidably arranged in the sliding hole (18). The width of the movable portion (191) in the direction in which the base (2) extends into the shell (1) is greater than the aperture of the sliding hole (18).

4. The split quick-connect structure of a metal button according to claim 3, characterized in that: An extension block (121) is slidably provided in the limiting groove (12); the length of the extension block (121) in the direction in which the limiting block (213) extends into the limiting groove (12) is not less than the length of the limiting groove (12); the limiting piece (15) and the limiting block (213) are capable of elastic deformation; a pressing cover (7) is provided at one end of the fixing portion (192) away from the base (2); the pressing cover (7) comprises a pushing portion (71) connected to the fixing portion (192) and an extruding portion (72) connected to the extension block (121).

5. The split quick-connect structure of a metal button according to claim 1, characterized in that: A plurality of accommodating grooves (211) are provided on the outer side wall of the base (2), a connecting spring (212) is provided in the accommodating groove (211), the limiting block (213) is provided at one end of the connecting spring (212), and the connecting spring (212) has a tendency to drive the limiting block (213) to extend into the limiting groove (12).

6. The split quick-connect structure of a metal button according to claim 1, characterized in that: A cleaning pad (24) is provided at one end of the base (2) close to the housing (1), the cleaning pad (24) abuts against the groove wall of the installation groove (17), and the cleaning pad (24) can undergo elastic deformation.

7. The split quick-connect structure of a metal button according to claim 1, characterized in that: A plurality of clearance grooves (13) for the limiting blocks (213) to extend into are provided on the inner side wall of one end of the shell (1) close to the base (2), and the clearance grooves (13) extend along the side wall of the shell (1) close to the base (2) to the groove wall of the limiting groove (12).

8. The split quick-connect structure of a metal button according to claim 1, characterized in that: A fixing groove (21) is provided on the circumferential direction of the outer wall of the base (2); the limiting block (213) is arranged on the groove wall of the fixing groove (21); a plurality of positioning blocks (22) are provided on the groove wall of the fixing groove (21); a plurality of positioning grooves (11) are provided on the side wall of the shell (1); when the shell (1) is connected to the base (2), the shell (1) extends into the fixing groove (21) and the positioning blocks (22) extend into the positioning grooves (11).

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