Quick connecting and releasing mechanism of ship mooring device

Abstract

The invention relates to the technical field of ship engineering, and discloses a quick connecting and releasing mechanism of a ship mooring device, which mainly comprises a remote control ship, a connecting mechanism, a mooring rope, a clamping pile assembly and an adjusting assembly. The connecting mechanism connects a ship with the pile clamping assembly through a mooring rope, and the pile clamping assembly is composed of a first clamping plate, a second clamping plate and a driving structure. The first clamping plate and the second clamping plate are clamped with the fixing pile through the arc-shaped clamping grooves and are controlled by the driving structure to be opened and closed, and tight connection with the fixing pile is ensured. When the ship needs to be driven away, the gear motor is electrically controlled to rotate reversely, and the driving block drives the pile clamping assembly and the fixing pile to be unlocked and released. Besides, in order to cope with emergencies such as power failure, a power failure self-unlocking mechanism is designed and comprises a lock seat, a lock sleeve, lock teeth, a lock groove, a telescopic chamber, a spring bolt and a steel wire rope, and it is ensured that manual unlocking can be achieved by pulling the steel wire rope when power is interrupted, so that the ship can be smoothly driven away.

Description

Technical Field

[0001] The invention relates to the technical field of ship engineering, and in particular to a quick connection and release mechanism for a ship mooring device. Background Art

[0002] Existing ship mooring devices mainly rely on manual connection of cables to fixed piles at the dock, and rely on manpower for connection and release operations. This method is cumbersome and inefficient, and requires manual operation on the shore, which poses certain safety hazards. In addition, when encountering wind and waves or urgently needing to leave the dock, manual release takes more time, and cannot guarantee fast and convenient berthing and unberthing of ships.

[0003] In view of the shortcomings of existing technologies, people have tried to develop and use remote control technology to automate the operation of ship mooring. Some solutions use unmanned ships or remote-controlled ships to connect the cables to the fixed piles, but there are still problems with the accuracy and reliability of remote operation and the inability to release in the event of a power outage.

[0004] At present, some ship mooring devices have adopted electric control structures, which can realize remote control of the connection mechanism, such as adjusting the angle and height of the pile clamp assembly, and driving the connection and release of the pile clamp assembly with the fixed pile. However, most of these solutions rely on battery power. When the battery is exhausted or encounters other circuit instability such as power outage, it will affect the release between the cable and the fixed pile, resulting in the ship being unable to leave the dock in time.

[0005] Therefore, we propose a quick connection and release mechanism for a ship mooring device to solve the problems in the above background. Summary of the invention

[0006] The object of the present invention is to provide a quick connection and release mechanism for a ship mooring device, so as to solve the problem that the existing ship mooring device proposed in the above background technology mainly relies on manual connection of cables with fixed piles of the dock, and relies on manpower for connection and release operations, which is cumbersome to operate and inefficient.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A quick connection and release mechanism for a ship mooring device comprises a connection mechanism for quickly connecting, fixing or releasing a ship to a fixed pile of a dock, and a remote-controlled boat driving the connection mechanism to move on the water, wherein the connection mechanism comprises a cable connected and fixed to the hull of the ship, a pile clamping assembly and an adjustment assembly; the end of the cable away from the hull is connected to the pile clamping assembly, and the pile clamping assembly is used to lock and fix with the fixed pile of the dock; the adjustment assembly is installed on the remote-controlled boat and is used to adjust the height and angle of the pile clamping assembly.

[0009] The pile clamping assembly includes a first clamping plate and a second clamping plate for clamping the fixed pile, and a driving structure close to the first clamping plate and the second clamping plate. The first clamping plate and the second clamping plate are symmetrically arranged, and arc-shaped clamping grooves are opened on the inner sides of the first clamping plate and the second clamping plate.

[0010] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0011] The invention discloses a quick connection and release mechanism for a ship mooring device. The technical effect is that it can realize the rapid berthing and departure of ships, and it also solves the drawbacks of the traditional manual untying method, making the operation more convenient and faster. The device is mainly composed of a remote-controlled ship, a cable, a pile assembly and an adjustment assembly. The remote-controlled ship drives the cable, the pile assembly and the adjustment assembly to approach the fixed pile of the dock. The pile assembly is tightly engaged and fixed with the fixed pile through the arc-shaped grooves of the first and second clamping plates, and the quick connection and release of the pile assembly and the fixed pile are realized through the electrically controlled driving structure. The adjustment assembly is responsible for accurately adjusting the height and angle of the pile assembly to ensure quick alignment with the fixed pile. In order to solve the problem of the ship leaving in the case of a power outage, the device is also designed with a power-off self-unlocking mechanism. When a power outage occurs, the steel wire rope is pulled on the ship to drive the lock tongue out of the lock groove, and the spring pushes the first and second clamping plates to separate, thereby realizing the quick release between the cable and the fixed pile and ensuring the safe departure of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall side structure of the present invention;

[0013] Figure 2 It is a schematic diagram of the overall front-end structure of the present invention;

[0014] Figure 3 It is a schematic diagram of the connection mechanism structure of the present invention;

[0015] Figure 4 It is a schematic diagram of the structure of the connection mechanism of the present invention;

[0016] Figure 5 For the present invention Figure 4 Schematic diagram of the local enlarged structure.

[0017] Wherein: 1. remote control boat; 2. connecting mechanism; 3. cable; 4. pile assembly; 5. adjustment assembly; 6. first clamping plate; 7. second clamping plate; 8. arc-shaped clamping groove; 9. driving structure; 10. connecting shell; 11. driving groove; 12. bidirectional threaded rod; 13. driving block; 14. reduction motor; 15. rope seat; 16. ear plate; 17. sliding rod; 18. first electric telescopic rod; 19. lifting seat; 20. second electric telescopic rod; 21. rotating seat; 22. steering motor; 23. first spring; 24. power failure self-unlocking mechanism; 25. lock seat; 26. lock sleeve; 27. lock tooth; 28. lock groove; 29. ​​telescopic chamber; 30. lock tongue; 31. wire rope; 32. guide wheel; 33. chamfered slope; 34. limit groove; 35. second spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1:

[0020] See also Figure 1-5 , the present invention provides a technical solution:

[0021] A quick connection and release mechanism for a ship mooring device comprises a remote-controlled ship 1. A connection mechanism 2 is installed on the remote-controlled ship 1. The remote-controlled ship 1 drives the connection mechanism 2 to approach a fixed pile of a dock. The connection mechanism 2 is used for quickly connecting, fixing or releasing a ship moored at a shore with the fixed pile of the dock, so that the ship can be quickly docked and fixed. The connection mechanism 2 can be quickly released, which is conducive to the rapid departure of the ship. The operation is convenient and fast.

[0022] The connecting mechanism 2 includes a cable 3, a pile assembly 4 and an adjusting assembly 5; one end of the cable 3 is connected and fixed to the hull of the ship, and the other end thereof is connected to the pile assembly 4, and the pile assembly 4 is used to lock and fix with the fixed pile of the dock, so as to connect and fix the hull of the ship, prevent the ship from drifting on the water surface, and keep it stable;

[0023] The adjustment component 5 is installed on the remote control boat 1, and is used to adjust the height and angle of the pile clamping component 4, so that the pile clamping component 4 can be quickly aligned with the fixed pile of the dock;

[0024] The pile assembly 4 includes a first clamping plate 6 and a second clamping plate 7, which are symmetrically arranged. The first clamping plate 6 and the second clamping plate 7 are both provided with arc-shaped clamping grooves 8 on their inner sides. The first clamping plate 6 and the second clamping plate 7 are brought close to the fixed piles of the wharf, and then the arc-shaped clamping grooves 8 on their inner sides are engaged with the outer side of the fixed piles of the wharf, so that the first clamping plate 6 and the second clamping plate 7 are tightly fixed to the fixed piles.

[0025] A driving structure 9 is provided on the same side of the first clamping plate 6 and the second clamping plate 7. The driving structure 9 includes a connecting shell 10. The connecting shell 10 is made of high-strength steel. A driving groove 11 is provided inside the connecting shell 10. A bidirectional threaded rod 12 is rotatably connected inside the driving groove 11. The bidirectional threaded rod 12 is composed of two sections of symmetrically arranged screws fixedly connected. Two driving blocks 13 are symmetrically installed on the bidirectional threaded rod 12. The driving blocks 13 are threadedly connected to the surface of the screw. A reduction motor 14 is fixedly installed on the connecting shell 10. The driving shaft of the reduction motor 14 is fixedly connected to one end of the bidirectional threaded rod 12. The reduction motor 14 drives the bidirectional threaded rod 12 to rotate, and the bidirectional threaded rod 12 drives the two driving blocks 13 to move closer to or away from each other.

[0026] One end of the connecting shell 10 is fixedly connected to a rope seat 15, the cable 3 is fixedly connected to the inside of the rope seat 15, and the two sides of the connecting shell 10 away from the rope seat 15 are respectively fixedly connected to ear plates 16, and a sliding rod 17 is rotatably connected between the two ear plates 16. One end of the first clamping plate 6 and the second clamping plate 7 are respectively slidably sleeved on the outside of the sliding rod 17, and the first clamping plate 6 and the second clamping plate 7 are arranged between the two driving blocks 13;

[0027] The first clamping plate 6 and the second clamping plate 7 are respectively fixedly connected to the driving blocks 13 on their outer sides;

[0028] When the two driving blocks 13 are close to each other, they will push the first clamping plate 6 and the second clamping plate 7 to slide outside the slide rod 17 and approach each other, so as to clamp the fixed pile tightly and fix it with good stability. The clamping pile assembly 4 and the fixed pile can be clamped tightly by electric control;

[0029] When the ship needs to leave the dock, the reduction motor 14 is electrically controlled to rotate in the opposite direction, so that the two drive blocks 13 move away from each other, thereby driving the first clamping plate 6 and the second clamping plate 7 to separate, and the first clamping plate 6 and the second clamping plate 7 are separated from the fixed pile. Compared with the traditional method of manually fixing the cable 3 to the fixed pile, which then needs to be manually unhooked when the ship leaves, the above structure is more convenient and quick to operate, can be electrically controlled from a long distance, and is conducive to the rapid connection and release of the ship's mooring.

[0030] Furthermore, the adjustment component 5 includes a rotating seat 21, which is rotatably connected to the front end of the remote-controlled boat 1. A steering motor 22 is fixedly installed inside the front end of the remote-controlled boat 1. The driving shaft of the steering motor 22 is fixedly connected to the center of the rotating seat 21, and the rotating seat 21 is driven by the steering motor 22 to rotate in a horizontal circle; a first electric telescopic rod 18 is fixedly connected to the rotating seat 21, and the first electric telescopic rod 18 is longitudinally arranged and one end thereof away from the rotating seat 21 is fixedly connected to a lifting seat 19, and a second electric telescopic rod 20 is fixedly installed inside the lifting seat 19, and the second electric telescopic rod 20 is horizontally arranged and its telescopic end is connected to the rotating seat 21. The connecting shell 10 is fixedly connected to one end close to the rope seat 15, thereby providing adjustable support for the connecting shell 10. The horizontal angle of the connecting shell 10 is adjusted by rotating the rotating seat 21, thereby adjusting the angle of the pile assembly 4 installed on the connecting shell 10. Furthermore, the height of the pile assembly 4 is adjusted by telescoping the first electric telescopic rod 18, and the horizontal distance close to the pile assembly 4 is adjusted by telescoping the second electric telescopic rod 20. Through the adjustment of the above-mentioned angle, height and distance, the pile assembly 4 can be quickly approached to the fixed pile of the dock and clamped and fixed thereto, thereby realizing the rapid connection of the ship mooring.

[0031] Due to the large size of the ship, when docked, there is a certain distance from the shore of the pier, which makes it inconvenient to connect the cable 3 with the fixed pile. The remote-controlled ship 1 drives the connecting mechanism 2 to approach the shore of the pier, so that the cable 3 can be connected to the fixed pile over a long distance, making the mooring connection operation more convenient. The internal structure and wireless control of the remote-controlled ship 1 belong to the existing technology.

[0032] Embodiment 2:

[0033] The electrically controlled ship mooring device may run out of power after the ship has been docked for a long time, or encounter power outages or other circuit instability, which may affect the release of the cable 3 from the fixed pile when the ship leaves, affecting the stability of the equipment.

[0034] In order to solve the above problems, the above solution is further improved:

[0035] The difference from the first embodiment is that the first card plate 6 and the second card plate 7 are not fixedly connected to the driving block 13 on the outside thereof, and a first spring 23 is installed between the first card plate 6 and the second card plate 7, and the first spring 23 is sleeved on the slide rod 17;

[0036] A power-off self-unlocking mechanism 24 is installed between the first card plate 6 and the second card plate 7; the power-off self-unlocking mechanism 24 includes a lock seat 25 and a lock sleeve 26, the lock seat 25 is fixedly connected to one end of the first card plate 6 close to the slide bar 17, the lock sleeve 26 is fixedly connected to one end of the second card plate 7 close to the slide bar 17, the lock seat 25 is fixedly connected to one end of the lock sleeve 26 with a lock tooth 27, the lock sleeve 26 is provided with a lock groove 28 that is sleeved and matched with the lock tooth 27, the lock groove 28 is fixedly connected to one end away from the second card plate 7 with a telescopic chamber 29, the telescopic chamber 29 is provided with a lock tongue 30 that is slidably connected, the lock tongue 30 is fixedly connected to one end of the lock tongue 30 that is away from the lock groove 28 with a steel wire rope 31, and the upper end of the telescopic chamber 29 is provided with a guide wheel 32 for rotational sliding support and direction adjustment of the steel wire rope 31;

[0037] A chamfered surface 33 is provided on one end of the lock tongue 30 away from the wire rope 31 and close to the lock tooth 27. The lock tongue 30 passes through the telescopic chamber 29 and enters the lock groove 28. A limiting groove 34 is provided on one side of the lock tooth 27 close to the telescopic chamber 29, which matches the chamfered surface 33 of the lock tongue 30. The limiting groove 34 is provided with multiple and linearly equidistant distributions. When the first card plate 6 approaches the second card plate 7, the lock tooth 27 enters the lock groove 28. The lock tooth 27 first approaches the chamfered surface 33 of the lock tongue 30 and pushes it to slide toward the outside of the limiting groove 34. When the limiting groove 34 of the lock tooth 27 enters the lower end of the lock tongue 30, The lock tongue 30 is engaged with the limiting groove 34. Due to the special structural design of the lock tongue 30 and the limiting groove 34, the lock tooth 27 can only enter the lock groove 28 and cannot automatically exit the locking. Therefore, when the first clamping plate 6 and the second clamping plate 7 clamp and fix the fixed pile, the lock seat 25 and the lock cooperation and its matching parts are used to achieve automatic locking, so that the first clamping plate 6 and the second clamping plate 7 are locked and fixed with the fixed pile. Since a plurality of limiting grooves 34 are provided on the lock tooth 27, it can adapt to the different lengths of the first clamping plate 6 and the second clamping plate 7, so that fixed piles of different diameters can be locked and fixed;

[0038] Furthermore, in order to stably clamp the lock tongue 30 and the limiting groove 34, a second spring 35 is installed between the lock tongue 30 and the telescopic chamber 29. The second spring 35 always pushes the lock tongue 30 to move into the lock groove 28, which is beneficial to the clamping and fixing of the lock tongue 30 and the limiting groove 34.

[0039] In order to solve the problem of unlocking during power outage, after the first clamping plate 6 and the second clamping plate 7 clamp and fix the fixed pile, the two drive blocks 13 are separated to the outside, and the first clamping plate 6 and the second clamping plate 7 are not in contact with the drive block 13. When unlocking and releasing is required, the wire rope 31 is pulled on the ship, and the wire rope 31 drives the locking tongue 30 to withdraw to the outside of the fiber groove. At the same time, the first spring 23 pushes the first clamping plate 6 and the second clamping plate 7 to separate, thereby separating the fixed pile from between the first clamping plate 6 and the second clamping plate 7. The cable 3 and the fixed pile no longer interact with each other, so that the ship can move away.

[0040] Working principle of the quick connection and release mechanism of the ship mooring device:

[0041] First, the remote-controlled boat 1 drives the cable 3, the pile assembly 4 and the adjustment assembly 5 in the connection mechanism 2 to approach the fixed pile of the dock. The pile assembly 4 is fixed to the fixed pile through the arc-shaped groove 8 of the first clamping plate 6 and the second clamping plate 7 to prevent the ship from drifting and maintain stability. The adjustment assembly 5 is used to adjust the height and angle of the pile assembly 4 to ensure rapid alignment with the fixed pile. When the ship needs to leave, the electric control reduction motor 14 rotates in the opposite direction, so that the two drive blocks 13 drive the first clamping plate 6 and the second clamping plate 7 to separate, unlock and release from the fixed pile, and achieve rapid departure.

[0042] The specific connection mechanism 2 is as follows: the remote-controlled boat 1 drives the pile assembly 4 to approach the fixed pile of the dock. The pile assembly 4 includes a first clamping plate 6 and a second clamping plate 7, and the arc-shaped clamping groove 8 on the inner side of the clamping plate 8 is engaged with the outside of the fixed pile to ensure that the pile assembly 4 is tightly fixed to the fixed pile. When the two driving blocks 13 are close to each other, the first clamping plate 6 and the second clamping plate 7 are pushed to slide outside the slide bar 17 and approach each other, thereby holding the fixed pile tightly. By electrically controlling the reduction motor 14, the driving block 13 can be controlled to approach or move away, thereby realizing the rapid connection and release of the pile assembly 4 and the fixed pile.

[0043] In case of power failure, the release process is as follows: after the pile assembly 4 is clamped and fixed to the fixed pile, the two drive blocks 13 are first separated outward, and the first clamping plate 6 and the second clamping plate 7 are no longer in contact with the drive block 13. Next, the steel wire rope 31 is pulled on the ship, and the steel wire rope 31 drives the lock tongue 30 to withdraw from the outside of the lock groove 28. At the same time, the first spring 23 pushes the first clamping plate 6 and the second clamping plate 7 to separate, so that the fixed pile is released from the pile assembly 4, thereby realizing the separation between the cable 3 and the fixed pile, so that the ship can move away. This design ensures that the ship can still safely and quickly leave the dock in the case of power failure.

[0044] Although specific embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the specific embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick connection and release mechanism for a ship mooring device, characterized in that: The invention comprises a connection mechanism (2) for quickly connecting, fixing or releasing a ship and a fixed pile of a dock, and a remote-controlled ship (1) for driving the connection mechanism (2) to move on water, wherein the connection mechanism (2) comprises a cable (3) connected and fixed to the hull of the ship, a pile clamping assembly (4) and an adjustment assembly (5); the end of the cable (3) away from the hull is connected to the pile clamping assembly (4), and the pile clamping assembly (4) is used to lock and fix with the fixed pile of the dock; the adjustment assembly (5) is installed on the remote-controlled ship (1) and is used to adjust the height and angle of the pile clamping assembly (4).

2. A quick connection and release mechanism for a ship mooring device according to claim 1, characterized in that: The pile clamping assembly (4) comprises a first clamping plate (6) and a second clamping plate (7) for clamping the fixed pile, and a driving structure (9) close to the first clamping plate (6) and the second clamping plate (7). The first clamping plate (6) and the second clamping plate (7) are symmetrically arranged, and arc-shaped clamping grooves (8) are provided on the inner sides of the first clamping plate (6) and the second clamping plate (7).

3. A quick connection and release mechanism for a ship mooring device according to claim 2, characterized in that: The driving structure (9) is arranged on the same side of the first clamping plate (6) and the second clamping plate (7), and the driving structure (9) comprises a connecting shell (10), a driving groove (11) is provided inside the connecting shell (10), a bidirectional threaded rod (12) is rotatably connected inside the driving groove (11), the bidirectional threaded rod (12) is composed of two sections of symmetrically arranged screw rods fixedly connected, two driving blocks (13) are symmetrically installed on the bidirectional threaded rod (12), the driving blocks (13) are threadedly connected to the surface of the screw rod, a reduction motor (14) is fixedly installed on the connecting shell (10), the driving shaft of the reduction motor (14) is fixedly connected to one end of the bidirectional threaded rod (12), the reduction motor (14) drives the bidirectional threaded rod (12) to rotate, and the bidirectional threaded rod (12) drives the two driving blocks (13) to move closer to or away from each other.

4. A quick connection and release mechanism for a ship mooring device according to claim 3, characterized in that: One end of the connecting shell (10) is fixedly connected to a rope seat (15), the cable (3) is fixedly connected to the inside of the rope seat (15), and both sides of the connecting shell (10) away from the rope seat (15) are fixedly connected to ear plates (16), a sliding rod (17) is rotatably connected between the two ear plates (16), one end of the first clamping plate (6) and the second clamping plate (7) are respectively slidably sleeved on the outside of the sliding rod (17), and the first clamping plate (6) and the second clamping plate (7) are arranged between the two driving blocks (13).

5. A quick connection and release mechanism for a ship mooring device according to claim 4, characterized in that: The first clamping plate (6) and the second clamping plate (7) are respectively fixedly connected to the driving blocks (13) on their outer sides.

6. A quick connection and release mechanism for a ship mooring device according to claim 1, characterized in that: The adjustment assembly (5) comprises a rotating seat (21), the rotating seat (21) is rotatably connected to the front end of the remote-controlled boat (1), a steering motor (22) is fixedly installed inside the front end of the remote-controlled boat (1), and a driving shaft of the steering motor (22) is fixedly connected to the center of the rotating seat (21).

7. A quick connection and release mechanism for a ship mooring device according to claim 6, characterized in that: A first electric telescopic rod (18) is fixedly connected to the rotating seat (21); the first electric telescopic rod (18) is longitudinally arranged and one end thereof away from the rotating seat (21) is fixedly connected to a lifting seat (19); a second electric telescopic rod (20) is fixedly installed inside the lifting seat (19); the second electric telescopic rod (20) is horizontally arranged and the telescopic end thereof is fixedly connected to one end of the connecting shell (10) close to the rope seat (15).

8. A quick connection and release mechanism for a ship mooring device according to claim 4, characterized in that: The first card plate (6) and the second card plate (7) are not fixedly connected to the driving block (13) outside thereof, and a first spring (23) is installed between the first card plate (6) and the second card plate (7), and the first spring (23) is sleeved on the slide bar (17); a power failure self-unlocking mechanism (24) is installed between the first card plate (6) and the second card plate (7).

9. A quick connection and release mechanism for a ship mooring device according to claim 8, characterized in that: The power failure self-unlocking mechanism (24) comprises a lock seat (25) and a lock sleeve (26), wherein the lock seat (25) is fixedly connected to one end of the first card plate (6) close to the slide bar (17), and the lock sleeve (26) is fixedly connected to one end of the second card plate (7) close to the slide bar (17). The end of the lock seat (25) close to the lock sleeve (26) is fixedly connected with a lock tooth (27), and a lock groove (28) is provided inside the lock sleeve (26) and is sleeved with the lock tooth (27). The end of the lock groove (28) away from the second card plate (7) is fixedly connected with a telescopic chamber (29), and a lock tongue (30) is provided inside the telescopic chamber (29) and is slidably connected thereto. The end of the lock tongue (30) away from the lock groove (28) is fixedly connected with a steel wire rope (31), and a guide wheel (32) is installed at the upper end of the telescopic chamber (29), and the guide wheel (32) is used for rotating and sliding support of the steel wire rope (31) and adjusting its direction.

10. A quick connection and release mechanism for a ship mooring device according to claim 9, characterized in that: The locking tongue (30) is provided with a chamfered inclined surface (33) at one end away from the steel wire rope (31) and at a side close to the locking tooth (27); the locking tongue (30) passes through the telescopic chamber (29) and enters the interior of the locking groove (28); a limiting groove (34) matching with the chamfered inclined surface (33) of the locking tongue (30) is provided on one side of the locking tooth (27) close to the telescopic chamber (29); a plurality of limiting grooves (34) are provided and linearly equidistantly distributed; when the first clamping plate (6) approaches the second clamping plate (7), the locking tooth (27) enters the interior of the locking groove (28); the locking tooth (27) first approaches the chamfered inclined surface (33) of the locking tongue (30) and pushes it to slide toward the outer side of the limiting groove (34); when the limiting groove (34) of the locking tooth (27) enters the lower end of the locking tongue (30), the locking tongue (30) engages with the limiting groove (34).

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