Anti-falling type data transmission quick connection device

Abstract

The invention relates to the technical field of connecting devices, in particular to an anti-falling type data transmission quick connecting device which comprises a data carrier, a fixing ring seat is fixedly mounted on the surface of one side of the data carrier, a transmission socket is fixedly mounted on one side of the fixing ring seat, and a connecting outer cover is movably mounted on the outer side of the transmission socket in an inserted mode. An insulating supporting plate is fixedly installed in the connecting outer cover, a self-locking box is fixedly installed on the upper surface of the external interface, a pressing buckle mechanism is fixedly installed at the upper end of the self-locking box, and a lock catch base is slidably installed in each limiting sliding groove. According to the invention, a dual anti-drop structure of mechanical lock catch and self-locking pressing is adopted, the lock tongue of the lock catch base can be clamped and limited, the positioning block is embedded into the bracket for reinforcement, and the self-locking pressing mechanism realizes automatic locking, so that the interface can be prevented from being loosened due to vibration and pulling, and continuous data transmission is ensured. Meanwhile, a sealing clamping seat and a sealing mechanism of a limiting spring are arranged, dust and water can be isolated, collision can be prevented, and the environmental adaptability and durability of the device are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of connection device technology, specifically to a fast data transmission connection device with anti-disconnection capability. Background Technology

[0002] Anti-disconnection data transmission quick connection device is an important branch of the connection device technology field. It is mainly used in electronic equipment data interaction scenarios. Its core function is to realize the rapid docking of data carriers with external devices. At the same time, through a specific structural design, it prevents the interface from falling off due to external forces such as pulling and vibration during the connection process, so as to ensure the stability and security of data transmission. It is widely compatible with various devices that require high-frequency data transmission, such as computers, industrial control equipment, and communication terminals.

[0003] Most commonly used data transmission connection technologies employ a simple plug-and-play structure, where the connection is achieved through the physical mating of the interface and slot. Some devices add elastic clips or threaded tightening structures on the outside of the interface for added security. Common interfaces such as USB and HDMI focus on improving transmission speed and optimizing compatibility. Through standardized pin layouts and interface forms, they meet the universal connection needs of different devices, but their anti-dislodgement performance and environmental adaptability design are relatively simplified.

[0004] The existing technology has the following shortcomings:

[0005] 1. The anti-detachment structure has low reliability and insufficient ease of operation. Traditional elastic latches are prone to elastic decay due to metal fatigue after long-term use, resulting in loosening of the engagement. Although the threaded tightening structure has a better anti-detachment effect, it requires manual rotation to lock and unlock, which cannot meet the rapid connection requirements of high-frequency plugging and unplugging scenarios, and is difficult to operate in the confined space of the equipment.

[0006] Second, there is a lack of integrated sealing and protection design. Most connection devices do not have special protection against external environmental interference. The metal contacts of the interface are easily exposed to dust and moisture, which can lead to corrosion and oxidation over time, resulting in poor contact. At the same time, there are no physical protective components on the outside of the interface, and accidental bumps can easily cause damage to the interface shell and bending of the internal pins, shortening the service life of the equipment.

[0007] Third, connection stability is greatly affected by external forces. Existing technology does not take into account dynamic interference factors such as equipment vibration and cable pulling. For example, mechanical vibration in industrial workshops can cause slight displacement of the interface and slot, which can lead to data transmission interruption. When used outdoors, if the cable is accidentally pulled, it can easily cause the interface to fall off, posing a risk of data loss and making it difficult to adapt to complex working conditions. Summary of the Invention

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A fast connection device for data transmission with anti-disconnection features a data carrier, a protective shell sleeved on the outer end of the data carrier, a flip-top plate rotatably mounted on the upper end of one side of the protective shell, a fixing ring seat fixedly mounted on one side of the data carrier, a transmission port fixedly mounted on one side of the fixing ring seat, a connecting cover movably inserted into the outer side of the transmission port, an insulating tray fixedly mounted inside the connecting cover, an inner insulating shell fixedly mounted on the upper end of the insulating tray, an insulating plate fixedly mounted between the insulating tray and the inner insulating shell, the transmission port connected to the insulating plate, an external interface movably connected to the other side of the insulating plate inside the insulating tray, a self-locking box fixedly mounted on the upper surface of the external interface, a pressing buckle mechanism fixedly mounted on the upper end of the self-locking box, limit grooves formed on both sides of the insulating tray, a locking base slidably mounted inside each limit groove, and a connection sealing mechanism fixedly mounted between the data carrier and the connecting cover.

[0009] As a preferred technical solution of the present invention, the pressing buckle mechanism includes an upper limit box fixedly installed on the upper end of the self-locking box, and a plurality of springs arranged at equal intervals are fixedly installed on the upper surface of the inner wall of the self-locking box, and two protrusions distributed front and back are fixedly installed on the upper end of the springs.

[0010] As a preferred technical solution of the present invention, the protective shell has slots at both the front and rear ends, positioning rings are fixedly installed at the rear ends of both sides of the data carrier, and front limiting posts are fixedly installed at the front ends of both sides of the data carrier. The protective shell slides between the positioning rings and the front limiting posts on the outer surface of the data carrier.

[0011] As a preferred technical solution of the present invention, the connection sealing mechanism includes a sealing bracket fixedly installed on the surface of the connection cover near the data carrier. The sealing bracket is engaged with the inner side of the fixing ring seat, and the sealing bracket has an L-shaped structure. A set of fixing blocks is fixedly installed on both the upper and lower surfaces of the sealing bracket, with each set consisting of two symmetrical fixing blocks. An inner liner plate is fixedly installed on one side of the sealing bracket.

[0012] As a preferred technical solution of the present invention, a limiting T-shaped rod is fixedly installed on one side surface of each of the fixed blocks, a fixing sealing plate is fixedly installed on the inner side of the fixing ring seat, the limiting T-shaped rod passes through the fixing sealing plate, and a limiting spring is sleeved on the outer side of the limiting T-shaped rod, the limiting spring being located between the inner surface of the fixing sealing plate and the fixed block.

[0013] As a preferred technical solution of the present invention, corresponding through grooves are provided on both sides of the connecting cover, a locking tongue is fixedly installed at the front end of the locking base, the locking tongue is slidably installed inside the through groove, a locking mating part is fixedly installed on one side of the rear end of the locking base, and a positioning block is fixedly installed on the other side of the rear end of the locking base, the positioning block is slidable between the limiting slide groove and the through groove.

[0014] As a preferred technical solution of the present invention, four positioning posts are fixedly installed on the upper surface of the inner wall of the insulating tray, an insulating plate is fixedly installed on the upper end of the positioning posts, and electrical terminals are fixedly installed on both sides of the insulating plate. External interfaces and transmission sockets are respectively snapped into the electrical terminals on both sides of the insulating plate, and symmetrical plugs are fixedly installed on the upper surface of the transmission socket. Corresponding limiting grooves are fixedly installed on the lower surface of the inner wall of the inner insulating shell, and clamping members are fixedly installed on the opposite inner sides of the external interfaces and transmission sockets. An electrical terminal is fixedly installed at the front end of each clamping member.

[0015] As a preferred embodiment of the present invention, the external interface is fixedly installed with slots on both sides, and the positioning block at the rear end of the locking base is slidably installed inside the slot, and the slot limits the positioning block.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention features a dual anti-detachment design, effectively improving connection stability. The device is equipped with a mechanical locking mechanism and a self-locking pressing structure to prevent detachment. The locking base inside the outer casing can slide along a limiting groove, and its locking tongue can engage and limit the mating component through a through groove. Simultaneously, the positioning block is embedded in the external interface's slot for further reinforcement, preventing the interface from loosening. The spring and protrusion inside the self-locking box form a pressing mechanism, which automatically locks the interface, effectively solving the problems of traditional connection devices easily detaching or experiencing poor contact due to vibration or pulling, ensuring the continuity of data transmission.

[0018] 2. This invention integrates sealing protection, adapting to complex working environments. The device is equipped with a connection and sealing mechanism combining an L-shaped sealing seat and a limiting spring. The sealing seat can be engaged inside the fixing ring seat, and the limiting T-shaped rod, in conjunction with the limiting spring, can buffer the impact force during docking. At the same time, the inner liner can fill the gap, forming a good sealing protection. In addition, the protective shell on the outside of the data carrier can slide between the positioning ring and the front limiting post, and the flip-up plate can cover the interface, which can isolate dust and moisture and prevent the interface from being accidentally bumped. Compared with traditional connection devices without protection or with only single protection, its environmental adaptability and durability are significantly enhanced. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a fast data transmission connection device with anti-disconnection capability according to the present invention;

[0020] Figure 2 This is a schematic diagram of another perspective of the anti-disconnection data transmission fast connection device of the present invention;

[0021] Figure 3 This is a partial structural cross-sectional view of a fast data transmission connection device for preventing data loss according to the present invention;

[0022] Figure 4 This is a schematic diagram of the insulating tray structure of a fast connection device for preventing data loss according to the present invention;

[0023] Figure 5 This is a schematic diagram of the insulating plate structure of a fast connection device for preventing data loss according to the present invention;

[0024] Figure 6 This is a schematic diagram of the pressing buckle mechanism of a fast connection device for preventing data loss according to the present invention;

[0025] Figure 7 This is a schematic diagram of the locking base structure of a fast connection device for preventing data loss according to the present invention;

[0026] Figure 8 This is a schematic diagram of the connection sealing mechanism of a fast connection device for preventing data loss according to the present invention;

[0027] Figure 9 This invention relates to a fast connection device for preventing data loss. Figure 8 Enlarged view of point A in the middle.

[0028] The components represented by each number in the attached diagram are listed below: 1. Data carrier; 2. Protective shell; 3. Flip cover; 4. Connecting outer cover; 5. Slot; 6. Positioning ring; 7. Inner insulating shell; 8. External interface; 9. Transmission port; 10. Insulating plate; 11. Locking base; 12. Insulating support plate; 13. Positioning post; 14. Support groove; 15. Limiting slide groove; 16. Insert block; 17. Clamping component; 18. Self-locking box; 19. Protrusion; 20. Upper limit box; 21. Spring; 22. Locking mating part; 23. Positioning block; 24. Lock tongue; 25. Fixing ring seat; 26. Sealing seat; 27. Fixing block; 28. Limiting T-shaped rod; 29. ​​Limiting spring; 30. Fixing sealing plate; 31. Through groove; 32. Limiting groove; 33. Inner liner plate; 34. Electrical terminal; 35. Front limiting post. Detailed Implementation

[0029] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0030] The present invention provides the following preferred embodiments:

[0031] like Figure 1-9 As shown, a fast data transmission connection device with anti-disconnection capability includes a data carrier 1, a protective shell 2 fitted over the outer end of the data carrier 1, a flip cover 3 rotatably mounted on the upper side of one side of the protective shell 2, a fixing ring seat 25 fixedly mounted on one side of the data carrier 1, a transmission port 9 fixedly mounted on one side of the fixing ring seat 25, a connecting cover 4 movably inserted into the outside of the transmission port 9, an insulating tray 12 fixedly mounted inside the connecting cover 4, an inner insulating shell 7 fixedly mounted on the upper end of the insulating tray 12, an insulating plate 10 fixedly mounted between the insulating tray 12 and the inner insulating shell 7, the transmission port 9 being connected to the insulating plate 10, an external interface 8 movably connected to the other side of the insulating plate 10 inside the insulating tray 12, a self-locking box 18 fixedly mounted on the upper surface of the external interface 8, a pressing buckle mechanism fixedly mounted on the upper end of the self-locking box 18, limit grooves 15 formed on both sides of the insulating tray 12, a locking base 11 slidably mounted inside each limit groove 15, and a connecting sealing mechanism fixedly mounted between the data carrier 1 and the connecting cover 4.

[0032] The pressing mechanism includes an upper limit box 20 fixedly installed on the upper end of the self-locking box 18. Several springs 21 arranged at equal intervals are fixedly installed on the upper surface of the inner wall of the self-locking box 18. Two protrusions 19 distributed front and back are fixedly installed on the upper end of the springs 21.

[0033] The protective shell 2 has slots 5 at both the front and rear ends. Positioning rings 6 are fixedly installed at the rear ends of both sides of the data carrier 1. Front limit posts 35 are fixedly installed at the front ends of both sides of the data carrier 1. The protective shell 2 slides between the positioning rings 6 and the front limit posts 35 on the outer surface of the data carrier 1.

[0034] The connecting sealing mechanism includes a sealing seat 26 fixedly installed on the surface of the connecting outer cover 4 near the data carrier 1. The sealing seat 26 is snapped into the inner side of the fixing ring seat 25, and the sealing seat 26 has an L-shaped structure. A set of fixing blocks 27 are fixedly installed on both the upper and lower surfaces of the sealing seat 26. Every two symmetrical fixing blocks 27 form a set. An inner liner plate 33 is fixedly installed on one side of the sealing seat 26.

[0035] Each fixing block 27 has a limiting T-shaped rod 28 fixedly installed on one side surface. A fixing sealing plate 30 is fixedly installed on the inner side of the fixing ring seat 25, and the limiting T-shaped rod 28 passes through the fixing sealing plate 30. A limiting spring 29 is sleeved on the outer side of the limiting T-shaped rod 28, and the limiting spring 29 is located between the inner surface of the fixing sealing plate 30 and the fixing block 27.

[0036] The outer cover 4 has corresponding through grooves 31 on both sides. The front end of the locking base 11 is fixedly installed with a locking tongue 24, which is slidably installed inside the through groove 31. The rear end of the locking base 11 is fixedly installed with a locking engagement part 22, and the rear end of the locking base 11 is fixedly installed with a positioning block 23, which slides between the limiting slide groove 15 and the through groove 31.

[0037] Four positioning posts 13 are fixedly installed on the upper surface of the inner wall of the insulating tray 12. An insulating plate 10 is fixedly installed on the upper end of the positioning posts 13. Electrical terminals 34 are fixedly installed on both sides of the insulating plate 10. External interfaces 8 and transmission sockets 9 are respectively snapped into the electrical terminals 34 on both sides of the insulating plate 10. Symmetrical plug blocks 16 are fixedly installed on the upper surface of the transmission socket 9. Corresponding limiting grooves 32 are fixedly installed on the lower surface of the inner wall of the inner insulating shell 7. Clamping parts 17 are fixedly installed on the opposite inner sides of the external interfaces 8 and the transmission sockets 9. An electrical terminal is fixedly installed at the front end of each clamping part 17.

[0038] The external interface 8 is fixedly installed with slots 14 on both sides. The positioning block 23 at the rear end of the locking base 11 is slidably installed inside the slot 14, and the slot 14 limits the positioning block 23.

[0039] Working principle:

[0040] In the unconnected state, the device ensures the safety of the transmission port 9 through multiple protective components. The protective shell 2 at the outer end of the data carrier 1 can slide along the gap between the positioning ring 6 and the front limit post 35. Under normal conditions, the protective shell 2 covers the transmission port 9, forming a physical barrier with the flip-top plate 3 mounted on one side, preventing the transmission port 9 from being exposed to dust, moisture, or accidental impacts. The slots 5 at the front and rear ends of the protective shell 2 can be adapted to external fixing structures, further improving the overall installation stability of the device. When it is necessary to connect to external equipment, first push the protective shell 2 to the positioning ring 6 to fully expose the transmission port 9, and then flip-top plate 3. At this time, the fixing ring seat 25 serves as the docking reference component, providing precise docking guidance for the connection cover 4, ensuring that the interface position does not shift during subsequent docking.

[0041] During docking, the connecting outer cover 4 is aligned with the fixed ring seat 25 and pushed in, which first triggers the sealing and buffering mechanism: the L-shaped sealing bracket 26 on one side of the connecting outer cover 4 is inserted into the inner side of the fixed ring seat 25. The fixing block 27 on the sealing bracket 26 drives the limiting T-shaped rod 28 to pass through the fixed sealing plate 30. The limiting spring 29 on the outer side of the limiting T-shaped rod 28 undergoes elastic deformation due to the compression between the fixing block 27 and the fixed sealing plate 30, which not only buffers the impact force during docking, but also allows the inner lining plate 33 on one side of the sealing bracket 26 to fit tightly against the inner wall of the fixed ring seat 25, filling the gaps and forming the first dustproof and waterproof sealing layer.

[0042] As the outer casing 4 continues to advance, the transmission port 9 is inserted into the insulating tray 12 and precisely engages with the electrical terminal 34 on one side of the insulating plate 10. Simultaneously, the external interface 8 establishes a connection through the electrical terminal 34 on the other side of the insulating plate 10, and the clamping member 17 on the opposite inner side of the external interface 8 and the transmission port 9 approaches each other, with their front electrical terminals tightly fitted, formally establishing a data transmission path. During this process, the symmetrical inserts 16 on the upper surface of the transmission port 9 are embedded in the limiting grooves 32 on the lower surface of the inner wall of the inner insulating housing 7, which, together with the four positioning posts 13 on the upper surface of the inner wall of the insulating tray 12, fixes the insulating plate 10, achieving initial positioning of the interface and preventing misalignment from affecting transmission efficiency.

[0043] Subsequently, a dual anti-disengagement structure is activated simultaneously: the first is mechanical locking protection. The locking base 11 slides along the limiting grooves 15 on both sides of the inner insulating shell 7 and the insulating support plate 12. Its front locking tongue 24 extends through the through grooves 31 on both sides of the connecting outer cover 4 and engages with the adapter structure on the outside of the fixing ring seat 25 to form a lateral limit. The positioning block 23 at the rear end of the locking base 11 is simultaneously embedded into the support grooves 14 on both sides of the external interface 8. The groove structure of the support groove 14 forms a longitudinal constraint on the positioning block 23. At the same time, the locking mating part 22 fits against the inner wall of the inner insulating shell 7, further enhancing the positional stability of the locking base 11 and preventing it from shifting during vibration. The second is self-locking pressing protection. In the self-locking box 18 on the upper surface of the external interface 8, several equidistantly arranged springs 21 push two front and rear distributed protrusions 19 upward. The protrusions 19 engage with the inner wall of the upper limit box 20 to achieve automatic locking of the interface. Anti-disengagement fixation can be completed without manual tightening, meeting the rapid connection requirements of high-frequency plugging and unplugging scenarios.

[0044] During data transmission, the sealing and anti-disengagement structures continuously function. The sealing mechanism, consisting of the sealing bracket 26 and the limiting spring 29, remains in a closed state, preventing the intrusion of external dust and water, and avoiding poor contact caused by corrosion and oxidation of components such as the insulating plate 10 and the electrical terminal 34. The protective shell 2 remains at the positioning ring 6, providing external protection for the mating part of the connecting outer cover 4 and the fixing ring seat 25, preventing accidental impact damage to the interface shell or internal pins. The dual anti-disengagement structure continuously counteracts external interference. Even when subjected to mechanical vibration in industrial workshops or pulling of outdoor cables, the lateral locking of the locking tongue 24 and the longitudinal constraint of the positioning block 23 can still firmly lock the interface position, ensuring that the transmission socket 9 and the electrical terminal of the external interface 8 are always tightly fitted, guaranteeing continuous and uninterrupted data transmission.

[0045] When disconnection is required, simply press the protrusion 19 on the upper limit box 20. The protrusion 19 compresses the spring 21 and disengages from the upper limit box 20, releasing the self-locking state. Then, pull the connecting cover 4 outward. The locking tongue 24 retracts along the through groove 31, the locking base 11 resets along the limiting slide groove 15, and the positioning block 23 disengages from the bracket 14, releasing the mechanical lock constraint. After the connecting cover 4 is completely pulled out, the limiting spring 29 elastically resets, causing the sealing card seat 26 and the limiting T-shaped rod 28 to return to their original positions. Finally, slide the protective shell 2 to cover the transmission port 9, close the flip cover 3, and the device returns to its initial protective state, ready for the next connection.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fast connection device for preventing data loss, comprising a data carrier (1), characterized in that, The data carrier (1) is fitted with a protective shell (2) at its outer end. A flip cover (3) is rotatably installed on the upper end of one side of the protective shell (2). A fixing ring seat (25) is fixedly installed on one side of the data carrier (1). A transmission port (9) is fixedly installed on one side of the fixing ring seat (25). A connecting cover (4) is movably inserted into the outside of the transmission port (9). An insulating tray (12) is fixedly installed inside the connecting cover (4). An inner insulating shell (7) is fixedly installed on the upper end of the insulating tray (12). An insulating spacer is fixedly installed between the insulating tray (12) and the inner insulating shell (7). The insulating plate (10) is connected to the transmission port (9). The other side of the insulating plate (10) is movably connected to the insulating tray (12). A self-locking box (18) is fixedly installed on the upper surface of the external interface (8). A pressing buckle mechanism is fixedly installed on the upper end of the self-locking box (18). Limiting grooves (15) are opened on both sides of the insulating tray (12). A locking base (11) is slidably installed inside each limiting groove (15). A connecting sealing mechanism is fixedly installed between the data carrier (1) and the connecting cover (4).

2. The anti-disconnection data transmission fast connection device according to claim 1, characterized in that, The pressing buckle mechanism includes an upper limit box (20) fixedly installed on the upper end of the self-locking box (18). Several springs (21) arranged at equal intervals are fixedly installed on the upper surface of the inner wall of the self-locking box (18). Two protrusions (19) distributed front and back are fixedly installed on the upper end of the springs (21).

3. The anti-disconnection data transmission fast connection device according to claim 1, characterized in that, The protective shell (2) has slots (5) at both the front and rear ends. The data carrier (1) has positioning rings (6) fixedly installed at the rear ends of both sides of the data carrier (1). The data carrier (1) has front limit posts (35) fixedly installed at the front ends of both sides of the data carrier (1). The protective shell (2) slides between the positioning rings (6) and the front limit posts (35) on the outer surface of the data carrier (1).

4. The anti-disconnection data transmission fast connection device according to claim 1, characterized in that, The connection sealing mechanism includes a sealing seat (26) fixedly installed on the surface of the connection cover (4) near the data carrier (1). The sealing seat (26) is engaged inside the fixing ring seat (25), and the sealing seat (26) has an L-shaped structure. A set of fixing blocks (27) are fixedly installed on both the upper and lower surfaces of the sealing seat (26). Every two symmetrical fixing blocks (27) form a set. An inner liner plate (33) is fixedly installed on one side of the sealing seat (26).

5. The anti-disconnection data transmission fast connection device according to claim 4, characterized in that, Each of the fixed blocks (27) has a limiting T-shaped rod (28) fixedly installed on one side surface. A fixed sealing plate (30) is fixedly installed on the inner side of the fixed ring seat (25), and the limiting T-shaped rod (28) passes through the fixed sealing plate (30). A limiting spring (29) is sleeved on the outer side of the limiting T-shaped rod (28), and the limiting spring (29) is located between the inner surface of the fixed sealing plate (30) and the fixed block (27).

6. The anti-disconnection data transmission fast connection device according to claim 1, characterized in that, The connecting cover (4) has corresponding through grooves (31) on both sides. The front end of the locking base (11) is fixedly installed with a locking tongue (24). The locking tongue (24) is slidably installed inside the through groove (31). The rear end of the locking base (11) is fixedly installed with a locking engagement part (22). The other rear end of the locking base (11) is fixedly installed with a positioning block (23). The positioning block (23) slides between the limiting slide groove (15) and the through groove (31).

7. The anti-disconnection data transmission fast connection device according to claim 1, characterized in that, Four positioning posts (13) are fixedly installed on the upper surface of the inner wall of the insulating tray (12). An insulating plate (10) is fixedly installed on the upper end of the positioning posts (13). Power terminals (34) are fixedly installed on both sides of the insulating plate (10). External interfaces (8) and transmission sockets (9) are respectively snapped into the power terminals (34) on both sides of the insulating plate (10). Symmetrical plugs (16) are fixedly installed on the upper surface of the transmission socket (9). A corresponding limiting groove (32) is fixedly installed on the lower surface of the inner wall of the inner insulating shell (7). Clamping parts (17) are fixedly installed on the opposite inner sides of the external interfaces (8) and transmission sockets (9). A power terminal is fixedly installed at the front end of each clamping part (17).

8. The anti-disconnection data transmission fast connection device according to claim 6, characterized in that, The external interface (8) is fixedly installed with slots (14) on both sides. The positioning block (23) at the rear end of the locking base (11) is slidably installed inside the slot (14), and the slot (14) limits the positioning block (23).

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