A pipe connector structure for farmland irrigation

Abstract

The present invention provides a pipe connector structure for farmland irrigation, which relates to the technical field of pipe connectors, including: a plug connector A and a plug connector B; the plug connector A is connected to a pipeline, the plug connector A is internally connected with a plug connector B, and the plug connector B is connected to the pipeline; a sealing ring is installed inside the plug connector A, and the sealing ring contacts the end of the plug connector B; and two movable positioning blocks are internally connected to the plug connector A. The present invention slides between a special-shaped hole and a guide block. When the guide block is at both ends of the special-shaped hole, the force sleeve plays a limiting effect on the locking ring. The nut drives the connecting rod to move through the rotating ring, so that the end of the connecting rod is connected to the connecting hook, which plays a double limiting and fixing effect on the locking ring, making the connection between the plug connector A and the plug connector B more stable and reliable. The present invention solves the problem that the existing pipe connectors for farmland irrigation generally adopt a clamping structure design for the convenience of quick disassembly and assembly, and the clamping structure of the connector is not stable and reliable in actual use.

Description

Technical Field

[0001] The invention relates to the technical field of pipe joints, and in particular to a pipe connector structure for farmland irrigation. Background Art

[0002] Farmland often needs to be irrigated when planting crops. For farmland irrigation operations, pipes need to be laid. Due to the limited length of a single pipe, connectors are needed to connect the pipes in series.

[0003] For example, the Chinese patent "CN110107756A Connector and Pipe Connection Structure" discloses two joint pipe connectors, the two joint pipe connectors are fixedly connected, a first thermal insulation member is arranged between the two joint pipe connectors, and both of the joint pipe connectors are provided with a through hole for the inner tube of the joint pipe to extend into and connect with the corresponding joint pipe connector; a pipeline connection structure is also provided, including two joint pipes and the above-mentioned connector, the two joint pipes are connected through the connector, the outer sides of the two joint pipe connectors are provided with an insulating sleeve for sealing the two joint pipe connectors, the insulating sleeve is provided with an opening for the two joint pipes to extend into and connect with the corresponding joint pipe connector, the two ends of the insulating sleeve are respectively connected to one of the joint pipes, and a vacuum channel is arranged between one end of the insulating sleeve and the corresponding joint pipe.

[0004] In the application process of existing farmland irrigation pipe connectors, in order to facilitate quick disassembly and assembly, a clamping structure design is generally adopted. In actual use, the clamping structure of the connector is not stable and reliable, and it is very easy to loosen due to accidental touch or external force, resulting in separation of the pipe connection part, affecting the application effect of farmland irrigation. Summary of the invention

[0005] The present invention relates to a pipe connector structure for farmland irrigation, which solves the problem that in the application process of existing pipe connectors for farmland irrigation, a clamping structure design is generally adopted for the convenience of quick disassembly and assembly. In actual use, the clamping structure of the connector is not stable and reliable, and it is very easy to loosen due to accidental touch or external force, resulting in separation of the pipe connection part, which affects the application effect of farmland irrigation.

[0006] In a first aspect of the present disclosure, a pipe connector structure for farmland irrigation is provided, which specifically includes: a plug connector A, a plug connector B, a sealing ring, a movable positioning block, a locking ring, a force-bearing sleeve, a nut, a rotating ring and a connecting rod; the plug connector A is connected to the pipeline, the plug connector A is internally connected to the plug connector B, and the plug connector B is connected to the pipeline; a sealing ring is installed inside the plug connector A, and the sealing ring is in contact with the end of the plug connector B; two movable positioning blocks are connected inside the plug connector A, and the movable positioning block is connected to the plug connector B; a locking ring and a force-bearing sleeve are externally sleeved on the plug connector A, the force-bearing sleeve is connected to the locking ring, and the locking ring is connected to the two movable positioning blocks; the plug connector B is externally connected to a nut, the nut is externally connected to a rotating ring, the rotating ring is externally connected to two connecting rods, and the locking ring is connected to the two connecting rods.

[0007] Furthermore, the plug connector B is plugged into the plug connector A, the sealing ring is located in the middle of the plug connector A and the plug connector B, a docking notch is provided on the outside of the plug connector A, and a docking protrusion is provided on the outside of the plug connector B, and the docking protrusion is plugged into the docking notch. By accurately plugging the docking protrusion into the docking notch, accurate alignment and connection between the external connection hole and the internal connection groove can be ensured.

[0008] Furthermore, the plug connector A is provided with an external connection hole on the outside, the plug connector B is provided with an internal connection groove on the outside, the external connection hole is communicated with the internal connection groove, the movable positioning block is slidably connected in the external connection hole, and the end of the movable positioning block is plugged into the internal connection groove.

[0009] Furthermore, the locking ring is slidably connected to the plug connector A, an oblique connecting hole is provided on the outside of the locking ring, a linkage block is provided on the outside of the movable positioning block, the linkage block is slidably connected in the oblique connecting hole, and a precise sliding fit design is adopted between the linkage block and the oblique connecting hole, allowing the locking ring to smoothly drive the two movable positioning blocks to move inward or outward synchronously when subjected to external force.

[0010] Furthermore, the force-bearing sleeve is movably connected to the plug connector A, and the force-bearing sleeve is rotatably connected to the locking ring. A spring is mounted on the outside of the plug connector A, one end of the spring is in contact with the plug connector A, and the other end of the spring is in contact with the force-bearing sleeve. When the external connecting hole and the internal connecting groove are just in an aligned and connected state, the locking ring and the force-bearing sleeve will be displaced by the thrust provided by the spring, and the locking ring drives the movable positioning block to move inward, so that the end of the movable positioning block can be accurately inserted into the internal connecting groove.

[0011] Furthermore, a guide block is provided on the outside of the plug connector A, and a special-shaped hole is provided on the outside of the force-bearing sleeve. The special-shaped hole is bidirectionally bent, and the guide block is slidably connected to the special-shaped hole. The special-shaped hole and the guide block are slidably matched. When the guide blocks are at both ends of the special-shaped hole, the force-bearing sleeve has a limiting effect on the locking ring.

[0012] Furthermore, the plug connector B is provided with an external thread on the outside, the nut is threadedly connected to the outside of the plug connector B, an annular groove is provided on the outside of the nut, and the rotating ring is rotatably connected in the annular groove.

[0013] Furthermore, one end of the connecting rod is rotatably connected to the rotating ring, a connecting hook is provided on the outside of the locking ring, and the other end of the connecting rod is connected to the connecting hook. When the locking ring drives the movable positioning block to be inserted into the inner connecting groove, the nut is rotated, and the nut drives the connecting rod to move through the rotating ring, so that the end of the connecting rod is connected to the connecting hook, which has a double limiting and fixing effect on the locking ring.

[0014] The present invention provides a pipe connector structure for farmland irrigation, which has the following beneficial effects:

[0015] When the present invention is in use, by accurately plugging and fitting the docking protrusion with the docking notch, it can ensure accurate alignment and connection between the external connection hole and the internal connection groove, effectively avoiding the rotational misalignment problem caused by improper plugging; a precise sliding fit design is adopted between the linkage block and the oblique connection hole, allowing the locking ring to smoothly drive the two movable positioning blocks to move inward or outward synchronously when subjected to external force; when the external connection hole and the internal connection groove are just in an aligned and connected state, the locking ring and the force sleeve will be displaced by the thrust provided by the spring, and the locking ring drives the movable positioning block to move inward, so that the end of the movable positioning block can be accurately inserted into the internal connection groove, and the movable positioning block plays a role in fixing the plug-in position of the plug connector A and the plug connector B.

[0016] In addition, when the end of the movable positioning block is inserted into the inner connecting groove, the locking ring is rotated to move the guide block to one end of the special-shaped hole, and the locking ring is prevented from moving in the opposite direction by the force sleeve, thereby ensuring the stability of the state of the movable positioning block, thereby making the connection between the plug connector A and the plug connector B more stable and reliable; when the plug connector A and the plug connector B need to be separated, the locking ring is rotated in the opposite direction to move the guide block to the turning part of the special-shaped hole, and the locking ring can be moved in the opposite direction to move the guide block to another turning part of the special-shaped hole, and the locking ring drives the locking ring to move in the opposite direction synchronously, the spring is gradually contracted under force, and the locking ring brings The movable positioning block is moved outward to separate the end of the movable positioning block from the inner connecting groove, so that the plug connector A and the plug connector B can be separated; after the plug connector A and the plug connector B are separated, the locking ring is continued to be rotated in the reverse direction to move the guide block to the other end of the special-shaped hole, and the lock ring is prevented from moving forward by the force sleeve, and the end of the movable positioning block is completely located in the outer connecting hole, so as to avoid the movable positioning block from hindering the subsequent plugging of the plug connector A and the plug connector B; through the sliding cooperation between the special-shaped hole and the guide block, when the guide block is at both ends of the special-shaped hole, the locking ring is limited by the force sleeve.

[0017] In addition, when the locking ring drives the movable positioning block to be inserted into the inner connecting groove, the nut is rotated, and the nut drives the connecting rod to move through the rotating ring, so that the end of the connecting rod is connected to the connecting hook, which has a double limiting and fixing effect on the locking ring, effectively ensuring the stability of the connection between the plug connector A and the plug connector B, avoiding the occurrence of accidental separation, greatly improving the safety and reliability of the entire structure, and making disassembly and assembly easier.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0020] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0021] In the attached picture:

[0022] Figure 1 A schematic diagram of the connection structure of the plug connector A and the plug connector B of the present application is shown;

[0023] Figure 2 A schematic diagram of the split structure of the plug connector A and the plug connector B of the present application is shown;

[0024] Figure 3 A schematic diagram of the structure of the plug connector A-axis side of the present application is shown;

[0025] Figure 4 A schematic diagram of the structure of the plug connector B axis side of the present application is shown;

[0026] Figure 5 A schematic diagram of the connection structure of the movable positioning block, the locking ring and the force-bearing sleeve of the present application is shown;

[0027] Figure 6 A schematic diagram of the split structure of the movable positioning block, the locking ring and the force-bearing sleeve of the present application is shown;

[0028] Figure 7 A schematic diagram of the connection structure of the nut, rotating ring and connecting rod of the present application is shown;

[0029] Figure 8 A schematic diagram of the disassembled structure of the nut, rotating ring and connecting rod of the present application is shown.

[0030] Reference numerals list

[0031] 1. Plug connector A; 101. Docking notch; 102. External connecting hole; 103. Guide block; 2. Plug connector B; 201. Docking protrusion; 202. Internal connecting groove; 3. Sealing ring; 4. Movable positioning block; 401. Linkage block; 5. Locking ring; 501. Oblique connecting hole; 502. Connecting hook; 6. Force sleeve; 601. Special-shaped hole; 7. Spring; 8. Nut; 801. Ring groove; 9. Rotating circle; 10. Connecting rod. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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.

[0033] Example 1: Please refer to Figures 1 to 8 :

[0034] The present invention proposes a pipe connector structure for farmland irrigation, comprising: a plug connector A1, a plug connector B2, a sealing ring 3, a movable positioning block 4, a locking ring 5, a force-bearing sleeve 6, a nut 8, a rotating ring 9 and a connecting rod 10; the plug connector A1 is connected to the pipeline, the plug connector A1 is internally connected with the plug connector B2, and the plug connector B2 is connected to the pipeline; a sealing ring 3 is installed inside the plug connector A1, and the sealing ring 3 contacts the end of the plug connector B2; two movable positioning blocks 4 are connected inside the plug connector A1, and the movable positioning block 4 is connected to the plug connector B2; a locking ring 5 and a force-bearing sleeve 6 are sleeved on the outside of the plug connector A1, and the force-bearing sleeve 6 is connected to the locking ring 5, and the locking ring 5 is connected to the two movable positioning blocks 4; a nut 8 is connected to the outside of the plug connector B2, and a rotating ring 9 is connected to the outside of the nut 8, and two connecting rods 10 are connected to the outside of the rotating ring 9, and the locking ring 5 is connected to the two connecting rods 10; the plug connector B2 is plugged into the plug connector A1, and the sealing ring 3 is located at the plug connector A 1 and the middle part of the plug connector B2, the plug connector A1 is provided with a docking notch 101 on the outside, and the plug connector B2 is provided with a docking protrusion 201 on the outside, and the docking protrusion 201 is plugged into the docking notch 101. By accurately plugging the docking protrusion 201 with the docking notch 101, it can be ensured that the external connection hole 102 and the internal connection groove 202 are accurately aligned and connected, and the rotation misalignment problem caused by improper plugging is effectively avoided; the plug connector A1 is provided with an external connection hole 102 on the outside, and the plug connector B2 is provided with an internal connection groove 202 on the outside, and the external connection hole 102 is connected to the internal connection groove 202, and the movable positioning block 4 is slidably connected in the external connection hole 102, and the end of the movable positioning block 4 is plugged into the internal connection groove 202; the locking ring 5 is slidably connected to the plug connector A1, the locking ring 5 is provided with an oblique connection hole 501 on the outside, and the movable positioning block 4 is provided with a linkage block 401 on the outside, and the linkage block 401 is slidably connected in the oblique connection hole 501.

[0035] In the embodiment of the present disclosure, the force-bearing sleeve 6 is movably connected to the plug connector A1, the force-bearing sleeve 6 is rotatably connected to the locking ring 5, a spring 7 is sleeved on the outside of the plug connector A1, one end of the spring 7 is in contact with the plug connector A1, and the other end of the spring 7 is in contact with the force-bearing sleeve 6;

[0036] By adopting the above technical solution, a precise sliding fit design is adopted between the linkage block 401 and the oblique connection hole 501, allowing the locking ring 5 to smoothly drive the two movable positioning blocks 4 to move inward or outward synchronously when subjected to external force; when the external connection hole 102 and the internal connection groove 202 are just in an aligned and connected state, the locking ring 5 and the force sleeve 6 will be displaced by the thrust provided by the spring 7, and the locking ring 5 drives the movable positioning block 4 to move inward, so that the end of the movable positioning block 4 can be accurately inserted into the internal connection groove 202, and the movable positioning block 4 has the effect of fixing the plug-in parts of the plug connector A1 and the plug connector B2.

[0037] In the embodiment of the present disclosure, a guide block 103 is disposed outside the plug connector A1, and a special-shaped hole 601 is disposed outside the force-bearing sleeve 6. The special-shaped hole 601 is in a bidirectional bending shape, and the guide block 103 is slidably connected in the special-shaped hole 601;

[0038] By adopting the above technical solution, when the end of the movable positioning block 4 is inserted into the inner connecting groove 202, the locking ring 5 is rotated to move the guide block 103 to one end of the special-shaped hole 601, and the locking ring 5 is prevented from moving in the opposite direction by the force-bearing sleeve 6, thereby ensuring the stability of the state of the movable positioning block 4, thereby making the connection between the plug connector A1 and the plug connector B2 more stable and reliable; when the plug connector A1 needs to be separated from the plug connector B2, the locking ring 5 is rotated in the opposite direction to move the guide block 103 to the turning part of the special-shaped hole 601, and the locking ring 5 can be moved in the opposite direction to move the guide block 103 to another turning part of the special-shaped hole 601, and the locking ring 5 drives the locking ring 5 to move in the opposite direction synchronously, and the spring 7 is gradually contracted under the force, and the locking ring 5 drives the movable positioning block 4 to move outward, so that the end of the movable positioning block 4 is separated from the inner connecting groove 202, and the plug connector A1 and the plug connector B2 can be separated; when the plug connector A1 and the plug connector B2 are separated, the locking ring 5 is continued to be rotated in the reverse direction to move the guide block 103 to the other end of the special-shaped hole 601, and the locking ring 5 is prevented from moving forward by the force sleeve 6, and the end of the movable positioning block 4 is completely located in the outer connecting hole 102, so as to avoid the movable positioning block 4 from hindering the subsequent plugging of the plug connector A1 and the plug connector B2; through the sliding cooperation between the special-shaped hole 601 and the guide block 103, when the guide block 103 is at both ends of the special-shaped hole 601, the locking ring 5 is limited by the force sleeve 6.

[0039] Embodiment 2, on the basis of embodiment 1, the plug connector B2 is provided with an external thread on the outside, the nut 8 is threadedly connected to the outside of the plug connector B2, the nut 8 is provided with an annular groove 801 on the outside, the rotating ring 9 is rotatably connected in the annular groove 801, one end of the connecting rod 10 is rotatably connected to the rotating ring 9, the locking ring 5 is provided with a connecting hook 502 on the outside, and the other end of the connecting rod 10 is connected in the connecting hook 502;

[0040] By adopting the above technical solution, when the locking ring 5 drives the movable positioning block 4 to be inserted into the inner connecting groove 202, the nut 8 is rotated, and the nut 8 drives the connecting rod 10 to move through the rotating ring 9, so that the end of the connecting rod 10 is connected to the connecting hook 502, which has a double limiting and fixing effect on the locking ring 5, effectively ensuring the stability of the connection between the plug connector A1 and the plug connector B2, avoiding the occurrence of accidental separation, greatly improving the safety and reliability of the entire structure, and making disassembly and assembly easier.

[0041] The working principle of this embodiment is as follows: first, the plug connector A1 and the plug connector B2 are plugged together, and the sealing ring 3 is in contact with the plug connector A1 and the plug connector B2, so as to seal the plug-in portion of the plug connector A1 and the plug connector B2; the docking protrusion 201 and the docking notch 101 are precisely plugged in and matched, which can ensure that the external connection hole 102 and the internal connection groove 202 are accurately aligned and connected; then the force-bearing sleeve 6 is rotated to move the guide block 103 to the turning portion of the special-shaped hole 601, and the locking ring 5 and the force-bearing sleeve 6 are displaced by the thrust provided by the spring 7, and the guide block 103 moves to another turning portion of the special-shaped hole 601, and the locking ring 5 drives the movable positioning The block 4 moves inward, so that the end of the movable positioning block 4 can be accurately inserted into the inner connecting groove 202, and the movable positioning block 4 plays a role in fixing the plug-in position of the plug connector A1 and the plug connector B2; then the force sleeve 6 is further rotated, and the guide block 103 moves to the end of the special-shaped hole 601, and the force sleeve 6 plays a role in limiting the locking ring 5, preventing the locking ring 5 from moving in the opposite direction, thereby ensuring the stability of the state of the movable positioning block 4; finally, the nut 8 is rotated, and the nut 8 drives the connecting rod 10 to move through the rotating ring 9, so that the end of the connecting rod 10 is connected to the connecting hook 502, which plays a role in double limiting and fixing the locking ring 5, effectively ensuring the stability of the connection between the plug connector A1 and the plug connector B2;

[0042] When it is necessary to separate the plug connector A1 from the plug connector B2, the nut 8 is rotated in the opposite direction, and the nut 8 drives the connecting rod 10 to move in the opposite direction through the rotating ring 9, and the connecting rod 10 is rotated to separate the end of the connecting rod 10 from the connecting hook 502; then the locking ring 5 is rotated in the opposite direction to move the guide block 103 to the turning part of the special-shaped hole 601, and the locking ring 5 can be moved in the opposite direction to move the guide block 103 to another turning part of the special-shaped hole 601, and the locking ring 5 drives the locking ring 5 to move in the opposite direction synchronously, and the spring 7 is gradually contracted under the force, and the locking ring 5 is locked. 5 drives the movable positioning block 4 to move outward, so that the end of the movable positioning block 4 is separated from the inner connecting groove 202, and the plug connector A1 and the plug connector B2 can be separated; after the plug connector A1 and the plug connector B2 are separated, the locking ring 5 is continued to be rotated in the reverse direction to move the guide block 103 to the other end of the special-shaped hole 601, and the locking ring 5 is prevented from moving forward by the force sleeve 6. The end of the movable positioning block 4 is completely located in the outer connecting hole 102, so as to avoid the movable positioning block 4 causing obstacles to the later plugging of the plug connector A1 and the plug connector B2.

[0043] In this article, there are a few points to note:

[0044] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0045] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0046] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A pipe connector structure for farmland irrigation, comprising: A plug connector A (1), a plug connector B (2), a sealing ring (3), a movable positioning block (4), a locking ring (5), a force-bearing sleeve (6), a nut (8), a rotating ring (9) and a connecting rod (10); characterized in that the plug connector A (1) is connected to a pipeline, the plug connector A (1) is internally connected to the plug connector B (2), and the plug connector B (2) is connected to the pipeline; a sealing ring (3) is installed inside the plug connector A (1), and the sealing ring (3) is in contact with the end of the plug connector B (2); the plug connector A (1) is internally connected to the plug connector B (2) and the sealing ring (3) is in contact with the end of the plug connector B (2); The plug connector A (1) is provided with two movable positioning blocks (4), the movable positioning blocks (4) being connected to the plug connector B (2); the plug connector A (1) is provided with a locking ring (5) and a force-bearing sleeve (6) on the outside, the force-bearing sleeve (6) being connected to the locking ring (5), and the locking ring (5) being connected to the two movable positioning blocks (4); the plug connector B (2) is provided with a nut (8) on the outside, the nut (8) is provided with a rotating ring (9) on the outside, the rotating ring (9) is provided with two connecting rods (10) on the outside, and the locking ring (5) is provided with the two connecting rods (10) on the outside.

2. A pipe connector structure for farmland irrigation according to claim 1, characterized in that: The plug connector B (2) is plugged into the plug connector A (1), the sealing ring (3) is located in the middle of the plug connector A (1) and the plug connector B (2), the plug connector A (1) is provided with a docking notch (101) on the outside, the plug connector B (2) is provided with a docking protrusion (201) on the outside, and the docking protrusion (201) is plugged into the docking notch (101).

3. A pipe connector structure for farmland irrigation according to claim 2, characterized in that: The plug connector A (1) is provided with an external connection hole (102) on the outside, and the plug connector B (2) is provided with an internal connection groove (202) on the outside. The external connection hole (102) is connected to the internal connection groove (202). The movable positioning block (4) is slidably connected in the external connection hole (102), and the end of the movable positioning block (4) is plugged into the internal connection groove (202).

4. A pipe connector structure for farmland irrigation according to claim 3, characterized in that: The locking ring (5) is slidably connected to the plug connector A (1); an oblique connection hole (501) is provided on the outside of the locking ring (5); a linkage block (401) is provided on the outside of the movable positioning block (4); and the linkage block (401) is slidably connected to the oblique connection hole (501).

5. The pipe connector structure for farmland irrigation according to claim 1, characterized in that: The force-bearing sleeve (6) is movably connected to the plug connector A (1), and the force-bearing sleeve (6) is rotatably connected to the locking ring (5). A spring (7) is sleeved on the outside of the plug connector A (1), one end of the spring (7) is in contact with the plug connector A (1), and the other end of the spring (7) is in contact with the force-bearing sleeve (6).

6. A pipe connector structure for farmland irrigation according to claim 5, characterized in that: The plug connector A (1) is provided with a guide block (103) on the outside, and the force-bearing sleeve (6) is provided with a special-shaped hole (601) on the outside. The special-shaped hole (601) is in a bidirectional bending shape, and the guide block (103) is slidably connected in the special-shaped hole (601).

7. The pipe connector structure for farmland irrigation according to claim 1, characterized in that: The plug connector B (2) is provided with an external thread on its exterior, the nut (8) is threadedly connected to the exterior of the plug connector B (2), an annular groove (801) is provided on the exterior of the nut (8), and the rotating ring (9) is rotatably connected to the annular groove (801).

8. A pipe connector structure for farmland irrigation according to claim 7, characterized in that: One end of the connecting rod (10) is rotatably connected to the rotating ring (9); a connecting hook (502) is provided outside the locking ring (5); and the other end of the connecting rod (10) is connected inside the connecting hook (502).

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