Air charging device for coupler of motor train unit

Abstract

The invention discloses an air charging device for a coupler of a motor train unit, which belongs to the technical field of motor train assembly and comprises an air charging pipe, an air outlet end and an air outlet end, the inflation tube is connected to the main body part; and the locking mechanism is connected with the main body part, and when the inflation pipe is connected with an air inlet of a car coupler, the locking mechanism can lock the relative positions of the main body part and the car coupler. The locking mode between the air charging device and the car coupler is changed, so that the air charging device is convenient and flexible to disassemble and assemble, the labor intensity is reduced, the number of operators is reduced, and the working efficiency and the operation safety coefficient are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of motor vehicle assembly, and in particular relates to an air charging device for a coupler of a motor vehicle. Background Art

[0002] When the existing air charging device inflates the coupler, the sealing between the air charging device and the air inlet of the coupler is achieved by pressing the rubber sealing rings face to face. This connection method requires thick materials that do not deform when a large pressure is applied to the air charging device to ensure the sealing effect, resulting in the overall bulkiness of the air charging device.

[0003] In actual operation, the current air charging device for the coupler requires one person to forcefully pull open the tongue spring handle of the coupler, and another person to lift the air charging tool and insert it into the tongue spring of the coupler, and then release the tongue spring handle to make the tongue spring tightly buckle the air charging tool to tightly connect the rubber sealing ring of the air charging port on the tool and the rubber sealing ring of the air inlet of the coupler. This air charging tool is cumbersome to operate, there is a risk of falling and being injured, the labor intensity is high and the work efficiency is low.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve at least some of the above-mentioned problems, the present invention provides an air charging device for the coupler of an EMU, which changes the locking method between the air charging device and the coupler, making the disassembly and assembly of the air charging device easy and flexible, reducing labor intensity, reducing the number of operators, and improving work efficiency and operation safety factor.

[0006] The basic concept of the technical solution adopted in the present invention is:

[0007] An air charging device for a coupler of an EMU, comprising:

[0008] The air outlet end of the air charging pipe can be extended into the air inlet of the coupler;

[0009] a main body, the inflation tube being connected to the main body;

[0010] The locking mechanism is connected to the main body, and when the inflation tube is connected to the air inlet of the coupler, the locking mechanism can lock the relative position of the main body and the coupler.

[0011] Furthermore, the inflation tube includes a main body section and a docking section, and the docking section can extend into the air inlet of the coupler;

[0012] An elastic annular sealing member is arranged on the outer side of the docking section, and the sealing member is sleeved on the docking section;

[0013] Preferably, there are multiple sealing members and they are arranged at intervals along the extension direction of the butt joint section.

[0014] Furthermore, the main body includes an upper half and a lower half;

[0015] When the inflation tube is connected to the air inlet of the coupler, the head end of the upper part abuts against the front end surface of the coupler; the head end of the lower part extends to the back side of the coupler.

[0016] Furthermore, the locking mechanism includes:

[0017] a stopper pivotally connected to the head end of the lower half;

[0018] A control assembly is connected to the stopper and is used to control the rotation of the stopper so that the stopper switches between a locked state and a released state.

[0019] Furthermore, the control component includes:

[0020] A sliding block is slidably connected to the lower half, and the moving direction of the sliding block is set from the head end to the tail end of the lower half;

[0021] A connecting rod, one end of which is hinged to the stopper, and the other end of which is hinged to the sliding block;

[0022] When the sliding block moves from the tail end to the head end of the lower half, the stopper turns to a locked state, and when the sliding block moves from the head end to the tail end of the lower half, the stopper turns to a released state;

[0023] Preferably, a handle is provided on the sliding block.

[0024] Further, the sliding block is slidably connected to the bottom end surface of the lower half;

[0025] An extension portion extending downward is fixedly disposed on the pivot;

[0026] One end of the connecting rod connected to the stopper is hinged on the extension part.

[0027] Furthermore, a guide rail is arranged on the bottom surface of the lower half, and the extension direction of the guide rail is arranged from the tail end to the head end of the lower half; when the sliding block moves, it moves along the extension direction of the guide rail;

[0028] Preferably, there are two guide rails, and the sliding block is located between the two guide rails.

[0029] Furthermore, a positioning pin is provided on the bottom end surface of the lower half, and when the sliding block moves toward the tail end of the lower half and abuts against the positioning pin, the stopper is in a released state.

[0030] Furthermore, a locking pin is provided on the lower half, and when the stopper is in a locked state, the locking pin can be connected to the sliding block and limit the sliding block from moving toward the tail end direction of the lower half.

[0031] Furthermore, the lower half is provided with a vertically arranged through hole;

[0032] The locking pin is movably disposed in the through hole;

[0033] When the sliding block moves toward the head end of the lower half and causes the stopper to turn to a locked state, the locking pin automatically falls down and abuts against a side wall of the sliding block on one side facing the tail end of the lower half.

[0034] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0035] 1. When the air inlet of the coupler is inflated with air by the practical air charging device, the outlet end of the air charging pipe of the air charging device is inserted into the interior of the air inlet of the coupler, and the existing face-to-face compression sealing method is replaced by the sealing between the outer wall of the air charging pipe and the hole wall of the air inlet of the coupler. The sealing between the outer wall of the air charging pipe and the hole wall of the air inlet of the coupler does not need to rely on the weight of the air charging device, thereby realizing the lightweight design of the air charging device.

[0036] 2. When locking the air charging device and the coupler, it can be operated by one person. Just push the sliding block to move toward the head end of the lower half to connect the air charging device and the coupler together, which reduces labor intensity, reduces the number of operators, and improves work efficiency and operation safety factor.

[0037] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0039] Figure 1 It is a structural schematic diagram of the stopper of the EMU coupler air charging device of the present invention being in a locked state;

[0040] Figure 2 It is a cross-sectional view of the inflation pipe of the EMU coupler inflation device of the present invention;

[0041] Figure 3 yes Figure 2A partial enlarged view of the middle A area;

[0042] Figure 4 It is a structural schematic diagram of the stopper of the EMU coupler air charging device of the present invention being in a released state;

[0043] Figure 5 It is a schematic diagram of the bottom structure of the main body of the EMU coupler air charging device of the present invention when the stopper is in a released state;

[0044] Figure 6 It is a cross-sectional view of the connection structure between the locking pin and the lower half of the EMU coupler air charging device of the present invention when the stopper is in a released state;

[0045] Figure 7 It is a cross-sectional view of the connection structure between the locking pin and the lower half of the EMU coupler air charging device of the present invention when the stopper is in a locked state.

[0046] In the figure: 1. main body; 11. upper part; 12. lower part; 121. guide rail; 1211. vertical part; 1212. horizontal part; 122. through hole; 2. inflation tube; 21. main body section; 22. docking section; 221. annular groove; 23. quick connector; 24. O-ring; 3. locking mechanism; 31. stopper; 311. pivot; 312. extension; 32. control assembly; 321. sliding block; 3211. handle; 322. connecting rod; 4. positioning pin; 5. locking pin; 51. locking rod; 52. locking cap.

[0047] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0049] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] like Figures 1 to 7 As shown, the present invention discloses an air charging device for a coupler of an EMU.

[0052] The air charging device for the coupler of a multiple-unit train comprises a main body 1, and an air charging pipe 2 is fixed on the top of the main body 1, and the air charging pipe 2 is used to be connected with the air inlet of the coupler. When the air charging pipe 2 is connected with the air inlet of the coupler, the air outlet end of the air charging pipe 2 can extend into the inside of the air inlet of the coupler. The outer wall of the area where the air charging pipe 2 extends into the inside of the air inlet of the coupler is sealed and abutted against the inner wall of the air inlet of the coupler. A locking mechanism 3 is provided at the bottom of the main body 1, and when the air charging pipe 2 is connected with the air inlet of the coupler, the locking mechanism 3 locks the relative position of the main body 1 and the coupler, so that the air charging device for the multiple-unit train coupler is fixed to the coupler.

[0053] In this embodiment, the main body 1 includes an upper half 11 and a lower half 12 arranged in an up-and-down arrangement, and the upper half 11 and the lower half 12 are welded and fixed. The length of the upper half 11 is shorter than that of the lower half 12. The projections of both ends of the upper half 11 in the direction where the lower half 12 is located are all located on the surface of the lower half 12 facing the upper half 11.

[0054] In this embodiment, the two ends of the main body 1, one end is the head end of the main body 1, and the other end is the tail end of the main body 1. When the EMU coupler air charging device is connected to the coupler, the head end of the main body 1 faces the direction of the coupler, and the tail end of the main body 1 faces away from the direction of the coupler.

[0055] Specifically, a step is formed between the upper half 11 and the lower half 12. When the EMU coupler air charging device is connected to the coupler, the end face of the head end of the upper half 11 abuts against the front end face of the coupler, and the head end of the lower half 12 extends from the bottom of the coupler to the back of the coupler. The locking mechanism 3 is connected to the lower half 12, and the locking mechanism 3 on the main body 1 can abut against the back of the coupler, so that the upper half 11 and the locking mechanism 3 clamp the coupler, so that the relative position of the EMU coupler air charging device and the coupler is locked.

[0056] In this embodiment, the inflation tube 2 includes a main body section 21 and a docking section 22. The main body section 21 and the docking section 22 are internally connected, and the main body section 21 and the docking section 22 are integrally formed. The outer diameter of the docking section 22 is adapted to the aperture of the air inlet of the hook. The docking section 22 is fixed to the top of the upper half 11 by welding. The docking section 22 extends to the front side of the head end of the upper half 11. On the side of the main body section 21 facing away from the docking section 22, a quick connector 23 is connected to the main body section 21, and the quick connector 23 and the main body section 21 can be fixed together by threaded connection or by welding. Through the quick connector 23, the air source can be quickly connected to the inflation tube 2.

[0057] In this embodiment, a plurality of annular grooves 221 are arranged at intervals along the extending square of the docking section 22 on the outer surface of the docking section 22, and an elastic O-ring 24 is installed inside each annular groove 221. The outer diameter of the O-ring 24 is larger than the outer diameter of the docking section 22, so that the outer surface of the O-ring 24 protrudes from the outer surface of the docking section 22.

[0058] When the docking section 22 is inserted into the air inlet of the coupler, the outer surface of the O-ring 24 abuts against the hole wall of the air inlet of the coupler, and the O-ring is in a squeezed state. The elasticity of the O-ring 24 is used to achieve a seal between the docking section 22 and the hole wall of the air inlet of the coupler, while not affecting the movement of the docking section 22 in the air inlet of the coupler, thereby avoiding air leakage at the air inlet of the coupler when the docking section 22 and the air inlet of the coupler are docked and inflated.

[0059] In this embodiment, the locking mechanism 3 includes a stopper 31 rotatably connected to the head end of the lower half 12, one end of the stopper 31 is rotatably connected to the lower half 12 as the rotation end of the stopper 31, and the other end of the stopper 31 is freely set as the free end of the stopper 31. The locking mechanism 3 also includes a control component 32 connected to the bottom end surface of the lower half 12, and the control component 32 is connected to the stopper 31 for controlling the stopper 31 to flip.

[0060] Specifically, the stopper 31 has two positions, one of which is a locked state and the other is a released state. When the stopper 31 is in the locked state, the stopper 31 is vertical, that is, the free end of the stopper 31 is located above the rotating end of the stopper 31. The free end of the stopper 31 is located above the lower half 12 and is horizontally opposite to the upper half 11. When the stopper 31 is in the released state, the stopper 31 is horizontal, that is, the free end of the stopper 31 and the rotating end of the stopper 31 are located at the same horizontal height.

[0061] In this embodiment, two parallel and opposite guide rails 121 are arranged on the bottom surface of the lower half 12, and the guide rails 121 are welded and fixed to the lower half 12. The extension direction of the two guide rails 121 is arranged along the extension direction of the lower half 12. A distance is left between the two guide rails 121.

[0062] The rotating end of the stopper 31 is rotatably connected between the two guide rails 121 via a pivot 311. The stopper 31 and the pivot 311 are welded and fixed.

[0063] Preferably, there are two stoppers 31, and both stoppers 31 are connected to the pivot 311. The two stoppers 31 clamp the head end of the lower half 12 between the two stoppers 31.

[0064] Specifically, the guide rail 121 includes a vertical portion 1211 connected to the lower half 12, the top of the vertical portion 1211 is fixedly connected to the lower half 12 by welding, and the bottom of the vertical portion 1211 is provided with a horizontal portion 1212 extending horizontally in the direction of the other guide rail 121, and the horizontal portion 1212 and the vertical portion 1211 are integrally formed or fixed together by welding. A slide groove is formed between the horizontal portion 1212 and the bottom end surface of the lower half 12.

[0065] In this embodiment, the control assembly 32 includes a sliding block 321 slidably connected between the two guide rails 121, and the moving direction of the sliding block 321 is set along the extension direction of the guide rail 121. The sliding block 321 extends toward one side of the guide rail 121 into a sliding groove formed between the horizontal portion 1212 and the bottom end surface of the lower half 12.

[0066] A connecting rod 322 is provided on the sliding block 321 , one end of the connecting rod 322 is hinged to the sliding block 321 , and the other end of the connecting rod 322 is hinged to the stopper 31 .

[0067] Specifically, an extension portion 312 extending toward the lower half 12 is provided on the pivot 311 of the stopper 31, and the extension portion 312 is welded and fixed to the pivot 311. The connecting rod 322 is hinged to one end of the extension portion 312 away from the pivot 311.

[0068] In this embodiment, in order to facilitate the control of the movement of the sliding block 321 , a handle 3211 is fixed to the sliding block 321 , and the handle 3211 is used to apply force to the sliding block 321 to push the sliding block 321 to reciprocate between the two guide rails 121 .

[0069] When the sliding block 321 is pushed to move toward the head end of the lower half 12, the connecting rod 322 located between the stopper 31 and the sliding block 321 pushes the stopper 31 to flip, so that the free end of the stopper 31 flips toward the top of the lower half 12, and the stopper 31 rotates to a locked state.

[0070] When the sliding block 321 is pushed to move toward the tail end of the lower half 12, the connecting rod 322 located between the stopper 31 and the sliding block 321 pulls the stopper 31 to flip, so that the free end of the stopper 31 flips toward the bottom of the lower half 12, and the stopper 31 rotates to a loose state.

[0071] In this embodiment, a positioning pin 4 is provided between the two guide rails 121, and the positioning pin 4 is fixed on the bottom surface of the lower half 12. When the sliding block 321 moves toward the rear end of the lower half 12, the sliding block 321 can abut against the positioning pin 4, and the positioning pin 4 can block the sliding block 321, limiting the sliding block 321 from continuing to move toward the rear end of the lower half 12. When the sliding block 321 abuts against the positioning pin 4, the stopper 31 is in a released state.

[0072] In this embodiment, a through hole 122 is provided on the lower half 12, which vertically penetrates the lower half 12. The through hole 122 is located on the side of the positioning pin 4 facing the head end of the lower half 12. A locking pin 5 is inserted into the through hole 122. When the control component 32 controls the stopper 31 to flip to the locked state, the locking pin 5 can automatically fall down, thereby locking the control component 32 and keeping the stopper 31 in the locked state.

[0073] Specifically, the locking pin 5 includes a locking rod 51 and a locking cap 52 located at one end of the locking rod 51, and the locking rod 51 and the locking cap 52 are integrally formed. The locking rod 51 is clearance-matched with the through hole 122, and the locking rod 51 can pass through the through hole 122 and can move vertically in the through hole 122. When the locking pin 5 is inserted into the through hole 122, the locking cap 52 is located above the lower half 12. The diameter of the locking cap 52 is larger than the aperture of the through hole 122. The length dimension of the locking rod 51 is larger than the height dimension of the lower half 12, so that when the locking cap 52 abuts against the upper surface of the lower half 12, the bottom of the locking rod 51 can move to the bottom of the lower half 12.

[0074] When the locking rod 51 of the locking pin 5 is inserted into the through hole 122 and the bottom of the locking rod 51 moves to the bottom of the lower half 12, the bottom of the locking rod 51 is located between the two guide rails 121. The locking pin 5 is located on the side of the positioning pin 4 facing the head end of the lower half 12.

[0075] When the sliding block 321 moves toward the head end of the lower half 12 and the stopper 31 is in a locked state, the sliding block 321 is misaligned with the locking pin 5 in the horizontal direction, and the sliding block 321 is located on the side of the locking pin 5 facing the head end of the lower half 12. When the sliding block 321 is misaligned with the locking pin 5 in the horizontal direction, the locking pin 5 falls under the action of gravity, and the locking rod 51 moves downward and the bottom of the locking rod 51 is located between the two guide rails 121. When the locking rod 51 falls and the bottom is located between the two guide rails 121, the sliding block 321 can be restricted so that the sliding block 321 cannot move toward the tail end of the lower half 12, so that the stopper 31 remains in a locked state.

[0076] When the sliding block 321 abuts against the positioning pin 4, the sliding block 321 is located below the through hole 122. The sliding block 321 can support the locking pin 5 so that the bottom of the locking rod 51 of the locking pin 5 is located inside the through hole 122, and the bottom end face of the locking rod 51 abuts against the sliding block 321.

[0077] When inflating the EMU coupler, first, the stopper 31 of the control mechanism is in a loose state, and then the docking section 22 of the inflation tube 2 is inserted into the air inlet of the coupler, and the head end of the upper half 11 of the main body 1 is abutted against the front end surface of the coupler. The handle 3211 is held to apply force to the sliding block 321, pushing the sliding block 321 to move toward the head end of the lower half 12. As the sliding block 321 continues to move toward the head end of the lower half 12, the connecting rod 322 pushes the stopper 31 to flip until the stopper 31 flips to a locked state, at which time the stopper 31 is stuck on the back of the coupler. The locking pin 5 falls under the influence of gravity and abuts against a side wall of the sliding block 321 toward the tail end of the lower half 12, limiting the sliding block 321 from moving toward the tail end of the lower half 12, so that the stopper 31 remains locked.

[0078] In some other embodiments, the through hole 122 may be a threaded hole, the locking pin 5 may be a bolt, and the locking pin 5 is threadedly connected to the through hole 122 .

[0079] When the sliding block 321 moves toward the head end of the lower half 12 and the stopper 31 flips to the locked state, the locking pin 5 is rotated to move the locking pin 5 toward the bottom end of the lower half 12, so that the locking rod 51 of the locking pin 5 abuts against the side wall of the sliding block 321 facing the tail end of the lower half 12. When the coupler air charging device needs to be separated from the coupler, the locking pin 5 is rotated in the opposite direction, so that the bottom of the locking pin 5 moves toward the top of the lower half 12 and is retracted into the through hole 122, and the sliding block 321 can be moved toward the tail end of the lower half 12.

[0080] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. An air charging device for a coupler of an EMU, characterized in that: Included are: The air outlet end of the air charging pipe (2) can extend into the air inlet of the coupler; A main body (1), the inflation tube (2) being connected to the main body (1); The locking mechanism (3) is connected to the main body (1), and when the inflation tube (2) is connected to the air inlet of the coupler, the locking mechanism (3) can lock the relative position of the main body (1) and the coupler.

2. The air-filling device for the coupler of a train set according to claim 1, characterized in that: The inflation tube (2) comprises a main body section (21) and a docking section (22), and the docking section (22) can extend into the air inlet of the coupler; An elastic annular sealing member is arranged on the outer side of the docking section (22), and the sealing member is sleeved on the docking section (22); Preferably, the sealing elements are multiple in number and are arranged at intervals along the extension direction of the butt joint section (22).

3. The air-charging device for the coupler of a train set according to claim 1, characterized in that: The main body (1) comprises an upper half (11) and a lower half (12); When the inflation tube (2) is connected to the air inlet of the coupler, the head end of the upper half (11) abuts against the front end surface of the coupler; the head end of the lower half (12) extends to the back side of the coupler.

4. The air-charging device for the coupler of a train set according to claim 3, characterized in that: The locking mechanism (3) comprises: A stopper (31) rotatably connected to the head end of the lower half (12) via a pivot (311); A control assembly (32) is connected to the stopper (31) and is used to control the rotation of the stopper (31) so that the stopper (31) switches between a locked state and a released state.

5. The air-charging device for the coupler of a train set according to claim 4, characterized in that: The control component (32) comprises: A sliding block (321) is slidably connected to the lower half (12), and the moving direction of the sliding block (321) is set from the head end to the tail end of the lower half (12); A connecting rod (322), one end of which is hinged to the stopper (31), and the other end of which is hinged to the sliding block (321); When the sliding block (321) moves from the tail end to the head end of the lower half (12), the stopper (31) turns to a locked state; when the sliding block (321) moves from the head end to the tail end of the lower half (12), the stopper (31) turns to a released state; Preferably, a handle (3211) is provided on the sliding block (321).

6. The air-charging device for the coupler of a train set according to claim 5, characterized in that: The sliding block (321) is slidably connected to the bottom surface of the lower half (12); An extension portion (312) extending downward is fixedly provided on the pivot (311); One end of the connecting rod (322) connected to the stopper (31) is hinged on the extension portion (312).

7. The air-charging device for the coupler of a train set according to claim 5, characterized in that: A guide rail (121) is arranged on the bottom surface of the lower half (12), and the extension direction of the guide rail (121) is arranged from the rear end to the front end of the lower half (12); when the sliding block (321) moves, it moves along the extension direction of the guide rail (121); Preferably, the number of the guide rails (121) is two, and the sliding block (321) is located between the two guide rails (121).

8. The air-charging device for the coupler of a train set according to claim 5, characterized in that: A positioning pin (4) is provided on the bottom surface of the lower half (12), and when the sliding block (321) moves toward the rear end of the lower half (12) and abuts against the positioning pin (4), the stopper (31) is in a released state.

9. The air-charging device for the coupler of a train set according to claim 5, characterized in that: The lower half (12) is provided with a locking pin (5). When the stopper (31) is in a locked state, the locking pin (5) can be connected to the sliding block (321) and restrict the sliding block (321) from moving toward the rear end of the lower half (12).

10. The air-charging device for the coupler of a train set according to claim 9, characterized in that: The lower half (12) is provided with a vertically arranged through hole (122); The locking pin (5) is movably disposed in the through hole (122); When the sliding block (321) moves toward the head end of the lower half (12) and turns the stopper (31) to a locked state, the locking pin (5) automatically falls down and abuts against a side wall of the sliding block (321) facing the tail end of the lower half (12).

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