A choke manifold for oil and preventing leakage

Abstract

The application discloses a throttling manifold for petroleum and preventing leakage, which comprises a first pipe joint and a second pipe joint, the first pipe joint and the second pipe joint are connected through a butt joint assembly, a protection assembly is arranged on the periphery of the butt joint assembly, the protection assembly is connected with the first pipe joint and the second pipe joint, and the connecting position of the first pipe joint and the second pipe joint with the butt joint assembly is located in the protection assembly. The protection assembly is arranged at the connecting position of the first pipe joint, the second pipe joint and the butt joint assembly, the connecting position of the first pipe joint, the second pipe joint and the butt joint assembly is detected through the protection assembly, timely alarm can be given when leakage occurs, the safety risk is reduced, the leakage point can be rapidly located through the alarm, the loss can be greatly reduced, and the uncertainty of safe conveying of petroleum is reduced.

Description

Technical Field

[0001] This invention relates to the field of throttling manifold technology, specifically a throttling manifold for oil and to prevent leakage. Background Technology

[0002] The choke manifold in an oil well is a crucial piece of equipment in oil drilling and oil and gas extraction. Its main functions include using the choke valve's choking function for well control operations, removing contaminated drilling fluid from the well, and restoring pressure balance to suppress overflows. Additionally, the choke valve's pressure relief function reduces wellhead pressure, achieving "soft shut-in." Simultaneously, the large-flow discharge from the blowout valve reduces wellhead casing pressure, protecting the blowout preventer assembly.

[0003] Oil is typically transported under high pressure, a characteristic that imposes stringent standards on the sealing performance of pipeline systems, especially at pipe joints. Current technologies often employ direct butt connections using internal or external threads, flange connections, and clamp fastening. However, a significant problem is the general lack of leakage detection mechanisms at these connection points. This inability to monitor leakage at the joints in real time increases the uncertainty of safe oil transportation and poses potential safety risks. Summary of the Invention

[0004] This invention provides a throttling manifold for oil and to prevent leakage, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A throttling manifold for oil and preventing leakage includes a first pipe section and a second pipe section, which are connected by a docking assembly. A protective component is provided on the outer periphery of the docking assembly, and the protective component is connected to the first pipe section and the second pipe section.

[0007] The connection points between the first pipe section, the second pipe section, and the docking assembly are located inside the protective assembly.

[0008] Preferably, the docking assembly includes a first docking component and a second docking component, the first docking component and the second docking component are fixedly connected to the first pipe section and the second pipe section, the outer periphery of the first docking component and the second docking component are provided with fasteners, and the first docking component and the second docking component are connected by fasteners.

[0009] Preferably, a first sleeve is slidably inserted into the first docking member, and a sleeve groove for accommodating the first sleeve is provided on the second docking member;

[0010] The second docking member is provided with a second sleeve, which can be inserted into the first docking member, and the second sleeve is located inside the first sleeve;

[0011] A first elastic element is provided between the end of the first sleeve located inside the first docking member and the inner side of the first docking member.

[0012] Preferably, a first pressing block is slidably connected inside the first mating member, and the first pressing block can press against the outside of the first sleeve;

[0013] A first pressure rod is fixedly connected to the first pressure block, the first pressure rod passes through the first mating member, and the first pressure rod is slidably connected to the first mating member;

[0014] A spring is provided between the first pressure block and the outer wall of the first docking member;

[0015] The fastener has an arc-shaped trigger groove on its end face near the first mating part, and the first pressure rod is slidably connected in the arc-shaped trigger groove;

[0016] The distance between the outer edge of the arc-shaped trigger groove and the outer wall of the first docking component gradually changes along the direction of rotation.

[0017] Preferably, a linkage rod is slidably connected inside the fastener, one end of the linkage rod is located in the arc-shaped trigger groove, and the side of the linkage rod facing the first pressure rod is provided with an inclined surface;

[0018] A limit plate is provided on the linkage rod, and a second elastic element is provided between the limit plate and the inner cavity of the fastener.

[0019] The fastener is slidably connected to a second pressure rod, one end of which is located on the sliding trajectory of the linkage rod, and the side of the second pressure rod facing the linkage rod is provided with an inclined surface;

[0020] The second pressure rod is fixedly connected to the second triggering block, and the second triggering block is slidably connected to the second pressure rod;

[0021] A spring is provided between the second trigger block and the fastener.

[0022] Preferably, a first triggering block is slidably connected to the side wall of the second docking member, and a second pressing block is fixedly connected to the first triggering block. One end of the second pressing block is located in the sleeve groove, and one end of the first triggering block is located on the surface of the side wall of the second docking member.

[0023] A third elastic element is provided between the first triggering block and the inner cavity of the second docking member;

[0024] A locking block is provided on one side of the first triggering block. The locking block can lock the first triggering block. The locking block is slidably connected to the inner cavity of the second docking member. A spring is provided between the locking block and the inner cavity of the second docking member.

[0025] The first trigger block can abut against the second trigger block.

[0026] Preferably, the protective component includes a fixing ring, and two sets of fixing rings are provided, with the two sets of fixing rings respectively fixedly connected to the first pipe section and the second pipe section;

[0027] A fixed block is fixedly connected to the fixed ring, a rotating shaft is rotatably connected to the fixed block, a trigger gear is fixedly connected to the rotating shaft, the trigger gear meshes with an external gear ring, the external gear ring is slidably connected to a fixed slider, the fixed slider is fixedly connected to a fixed side plate, and the fixed side plate is fixedly connected to a first pipe section and / or a second pipe section.

[0028] A sealing plate is fixedly connected to the rotating shaft, and adjacent sealing plates are sealed together. The sealing plate is slidably sealed to the external toothed ring. A sealing plate is fixedly connected to the fixed ring, and the sealing plate is slidably sealed to the external toothed ring.

[0029] Preferably, the outer toothed ring has teeth on its outer side, the teeth on the outer side of the outer toothed ring mesh with the rack, the rack is slidably connected to the base plate, and the base plate is fixedly connected to the first pipe section and / or the second pipe section;

[0030] A trigger rod is slidably connected to the base plate, and the trigger rod is fixedly connected to the rack;

[0031] A fixed side plate is fixedly connected to the side of the base plate, and a button is provided on the fixed side plate. The position of the button corresponds to the trigger rod.

[0032] Preferably, a fixing frame is fixedly connected to the fixing side plate, a drive motor is fixedly connected to the fixing frame, a drive shaft is fixedly connected to the output end of the drive motor, and a cam and a limiting rotating plate are fixedly connected to the drive shaft;

[0033] A drive slider is fixedly connected to the limiting rotating plate;

[0034] A drive disc is rotatably connected to the fixed side plate, and an alarm light is fixedly connected to the drive disc;

[0035] The drive disk is provided with a sliding groove, and the drive slider can be slidably connected in the sliding groove;

[0036] The cam is eccentrically rotatably connected to one end of a first connecting rod, the other end of the first connecting rod is rotatably connected to a slider, the slider is slidably connected to a fixed side plate, one end of a second connecting rod is rotatably connected to the slider, the other end of the second connecting rod is rotatably connected to a cover plate, and the cover plate is slidably connected to the fixed side plate.

[0037] The fixed side plate has holes.

[0038] Preferably, the button on the fixed side plate is electrically connected to the drive motor.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects:

[0040] This application provides a protective component at the connection between the first pipe section, the second pipe section, and the docking assembly. The protective component detects leakage at the connection between the first pipe section, the second pipe section, and the docking assembly. In the event of leakage, an alarm can be set in time to reduce safety risks. Furthermore, the alarm can quickly locate the leakage point, which can significantly reduce losses and reduce the uncertainty of safe oil transportation. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0042] Figure 2 This is a schematic diagram of the docking component structure of the present invention;

[0043] Figure 3 This is a partial structural diagram of the fastener of the present invention;

[0044] Figure 4 This is a partial structural diagram of the second docking member of the present invention;

[0045] Figure 5 This is a schematic diagram of the protective component structure of the present invention;

[0046] Figure 6 This is a schematic diagram of the sealing plate structure of the present invention;

[0047] Figure 7 This is a schematic diagram of the fixed side plate connection structure of the present invention;

[0048] Figure 8 This is a schematic diagram of the limiting rotating plate connection structure of the present invention;

[0049] Figure 9 This is a schematic diagram of the drive disk drive structure of the present invention;

[0050] Figure 10 This is a schematic diagram of the cover plate driving structure of the present invention.

[0051] In the diagram: 1. First pipe section; 2. Second pipe section; 3. Connecting assembly; 4. Protective assembly; 301. First connecting piece; 302. Second connecting piece; 5. First elastic element; 6. First pressure block; 7. First pressure rod; 8. Fastener; 9. Arc-shaped trigger groove; 10. Linkage rod; 11. Second elastic element; 12. First sleeve; 13. Second sleeve; 14. First trigger pressure block; 15. Sleeve groove; 16. Limiting plate; 17. Second trigger pressure block; 18. Second pressure rod; 19. Locking block; 20. Third elastic element; 21. 22. Second pressure block; 23. Fixed ring; 24. Rotating shaft; 25. Trigger gear; 26. External gear ring; 27. Sealing plate; 28. Base plate; 29. ​​Fixed side plate; 30. Trigger rod; 31. Rack; 32. Fixed block; 33. Cam; 34. First connecting rod; 35. Second connecting rod; 36. Cover plate; 37. Hole; 38. Fixed slider; 39. Drive motor; 40. Limiting rotating plate; 41. Drive slider; 42. Drive shaft; 43. Drive disc; 44. Alarm light; 45. Slide groove; 46. Fixed frame; 47. Slider. Detailed Implementation

[0052] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and do not specifically refer to any order or sequence, nor are they intended to limit the invention. They are merely used to distinguish protective components or operations described using the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0053] Example 1:

[0054] Please refer to Figure 1 A throttling manifold for oil and preventing leakage includes a first pipe section 1 and a second pipe section 2, which are connected by a docking assembly 3. A protective assembly 4 is provided on the outer periphery of the docking assembly 3, and the protective assembly 4 is connected to the first pipe section 1 and the second pipe section 2.

[0055] The connection points of the first pipe section 1, the second pipe section 2 and the docking assembly 3 are located inside the protective assembly 4.

[0056] The working principle and beneficial effects of the above scheme are as follows:

[0057] This application provides a protective component 4 at the connection between the first pipe section 1, the second pipe section 2 and the docking assembly 3. The protective component 4 detects leakage at the connection between the first pipe section 1, the second pipe section 2 and the docking assembly 3. When leakage occurs, it can promptly sound an alarm, reduce safety risks, and quickly locate the leakage point through the alarm, which can significantly reduce losses and reduce the uncertainty of safe oil transportation.

[0058] Example 2:

[0059] Please refer to Figures 2-4 Based on embodiment 1, the docking assembly 3 includes a first docking member 301 and a second docking member 302. The first docking member 301 and the second docking member 302 are fixedly connected to the first pipe section 1 and the second pipe section 2. Fasteners 8 are provided on the outer periphery of the first docking member 301 and the second docking member 302, and the first docking member 301 and the second docking member 302 are connected by the fasteners 8.

[0060] The first connecting member 301 has a first sleeve 12 slidably inserted into it, and the second connecting member 302 has a sleeve groove 15 for accommodating the first sleeve 12.

[0061] The second docking member 302 is provided with a second sleeve 13, which can be inserted into the first docking member 301, and the second sleeve 13 is located inside the first sleeve 12.

[0062] A first elastic element 5 is provided between one end of the first sleeve 12 located inside the first docking member 301 and the inner side of the first docking member 301.

[0063] The first mating member 301 is slidably connected to a first pressing block 6, which can press against the outside of the first sleeve 12.

[0064] A first pressure rod 7 is fixedly connected to the first pressure block 6. The first pressure rod 7 passes through the first docking member 301 and is slidably connected to the first docking member 301.

[0065] A spring is provided between the first pressure block 6 and the outer wall of the first docking member 301;

[0066] An arc-shaped trigger groove 9 is provided on the end face of the fastener 8 near the first mating part 301, and the first pressure rod 7 is slidably connected in the arc-shaped trigger groove 9;

[0067] The distance between the outer edge of the arc-shaped trigger groove 9 and the outer wall of the first docking member 301 gradually changes along the rotation direction.

[0068] A linkage rod 10 is slidably connected inside the fastener 8. One end of the linkage rod 10 is located in the arc-shaped trigger groove 9, and the linkage rod 10 has an inclined surface on the side facing the first pressure rod 7.

[0069] A limiting plate 16 is provided on the linkage rod 10, and a second elastic element 11 is provided between the limiting plate 16 and the inner cavity of the fastener 8.

[0070] A second pressure rod 18 is slidably connected inside the fastener 8. One end of the second pressure rod 18 is located on the sliding trajectory of the linkage rod 10, and the second pressure rod 18 is provided with an inclined surface on the side facing the linkage rod 10.

[0071] The second pressure rod 18 is fixedly connected to the second trigger pressure block 17, and the second trigger pressure block 17 is slidably connected to the second pressure rod 18;

[0072] A spring is provided between the second trigger block 17 and the fastener 8.

[0073] The second docking member 302 has a first triggering block 14 slidably connected to its side wall. A second pressing block 21 is fixedly connected to the first triggering block 14. One end of the second pressing block 21 is located inside the sleeve groove 15, and one end of the first triggering block 14 is located on the side wall surface of the second docking member 302.

[0074] A third elastic element 20 is provided between the first triggering block 14 and the inner cavity of the second docking member 302;

[0075] A locking block 19 is provided on one side of the first triggering block 14. The locking block 19 can lock the first contact triggering block 14. The locking block 19 is slidably connected to the inner cavity of the second docking member 302. A spring is provided between the locking block 19 and the inner cavity of the second docking member 302.

[0076] The first trigger block 14 can abut against the second trigger block 17.

[0077] The working principle and beneficial effects of the above scheme are as follows:

[0078] The connection between the first pipe section 1 and the second pipe section 2 is made through the docking assembly 3, which reduces the number of operation steps, increases the connection efficiency, and ensures the sealing of the manifold, effectively preventing leakage.

[0079] By connecting the first pipe section 1 and the second pipe section 2, the second sleeve 13 is inserted into the first sleeve 12, and the first sleeve 12 is inserted into the sleeve groove 15. The first elastic element 5 presses the first sleeve 12, causing the first sleeve 12 to move towards the first elastic element 5, so that the first sleeve 12 is tightly fitted with the inner wall of the sleeve groove 15. The design of the two sets of sleeves being stacked and inserted ensures the sealing effect. After the first pipe section 1 and the second pipe section 2 are connected, the fastener 8 is rotated, and the arc-shaped trigger groove 9 rotates accordingly, pressing the first pressure rod 7, which drives the first pressure block 6 to overcome the tension of the spring and press against the first sleeve 12, further enhancing the sealing effect between the first sleeve 12 and the first connecting part 301. To prevent leakage, the continuous rotation of fastener 8 causes the first pressure rod 7 to press against the linkage rod 10, overcoming the resistance of the second elastic element 11. This causes the linkage rod 10 to press against the second pressure rod 18, which in turn moves the second triggering block 17. The second triggering block 17 then presses against the first triggering block 14, causing the second pressing block 21 to overcome the resistance of the third elastic element 20 and press against one end of the first sleeve 12 located at the second docking part 302. This further enhances the sealing effect between the first sleeve 12 and the second docking part 302, preventing leakage. Finally, by locking the relative positions of the first docking part 301, the second docking part 302, and the fastener 8, the connection between the first pipe section 1 and the second pipe section 2 can be completed.

[0080] Example 3:

[0081] Please refer to Figures 5-10 Based on embodiment 1, the protective component 4 includes a fixing ring 22, and two sets of fixing rings 22 are provided. The two sets of fixing rings 22 are respectively fixedly connected to the first pipe section 1 and the second pipe section 2.

[0082] A fixing block 31 is fixedly connected to the fixing ring 22, and a rotating shaft 23 is rotatably connected to the fixing block 31. A trigger gear 24 is fixedly connected to the rotating shaft 23. The trigger gear 24 meshes with an external gear ring 25. The external gear ring 25 is slidably connected to a fixed slider 37. The fixed slider 37 is fixedly connected to a fixed side plate 28. The fixed side plate 28 is fixedly connected to the first pipe section 1 and / or the second pipe section 2.

[0083] A sealing plate 26 is fixedly connected to the rotating shaft 23, and adjacent sealing plates 26 are sealed together. The sealing plate 26 is slidably sealed to the external toothed ring 25. A sealing plate is fixedly connected to the fixed ring 22, and the sealing plate is slidably sealed to the external toothed ring 25.

[0084] The outer toothed ring 25 is provided with teeth on its outer side, and the teeth on the outer side of the outer toothed ring 25 mesh with the rack 30. The rack 30 is slidably connected to the base plate 27, and the base plate 27 is fixedly connected to the first pipe section 1 and / or the second pipe section 2.

[0085] A trigger rod 29 is slidably connected to the base plate 27, and the trigger rod 29 is fixedly connected to the rack 30;

[0086] A fixed side plate 28 is fixedly connected to the side of the base plate 27. A button is provided on the fixed side plate 28, and the position of the button corresponds to the trigger rod 29.

[0087] A fixing frame 45 is fixedly connected to the fixing side plate 28, a drive motor 38 is fixedly connected to the fixing frame 45, a drive shaft 41 is fixedly connected to the output end of the drive motor 38, and a cam 32 and a limiting rotating plate 39 are fixedly connected to the drive shaft 41.

[0088] A drive slider 40 is fixedly connected to the limiting rotating plate 39;

[0089] A drive plate 42 is rotatably connected to the fixed side plate 28, and an alarm light 43 is fixedly connected to the drive plate 42. The alarm light 43 preferentially selects visible light with a longer wavelength, such as red, orange, or yellow.

[0090] The drive disk 42 is provided with a slide groove 44, and the drive slider 40 can be slidably connected in the slide groove 44;

[0091] The cam 32 is eccentrically rotatably connected to one end of the first connecting rod 33, the other end of the first connecting rod 33 is rotatably connected to the slider 46, the slider 46 is slidably connected to the fixed side plate 28, one end of the second connecting rod 34 is rotatably connected to the slider 46, the other end of the second connecting rod 34 is rotatably connected to the cover plate 35, and the cover plate 35 is slidably connected to the fixed side plate 28.

[0092] The fixed side plate 28 is provided with holes 36.

[0093] The button on the fixed side plate 28 is electrically connected to the drive motor 38.

[0094] The working principle and beneficial effects of the above scheme are as follows:

[0095] When leakage occurs at the connection between the first pipe section 1, the second pipe section 2, and the docking assembly 3, the pressure inside the sealed sealing plate 26 will increase, squeezing the sealing plate 26 and causing the sealing plate 26 to drive the rotating shaft 23 to rotate, which in turn drives the trigger gear 24 to rotate. Since the trigger gear 24 meshes with the external gear ring 25, the trigger gear 24 moves through the rack 30 of the external gear ring 25, driving the trigger rod 29 to press the button, thereby starting the drive motor 38, driving the limit rotating plate 39 to rotate, and driving the drive disk 42 to rotate through the drive slider 40. The alarm light 43 on the drive disk 42 passes through the hole 36 in sequence and releases light outward to remind that leakage has occurred. The rotation of the drive motor 38 will drive the second connecting rod 34 and the cover plate 35 to move through the eccentrically connected first connecting rod 33. The cover plate 35 periodically covers the hole 36, so that the light emitted from the hole 36 is in dynamic change, further enhancing the warning effect.

[0096] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A choke manifold for oil and preventing flow leakage, characterized in that, It comprises a first pipe joint (1) and a second pipe joint (2), the first pipe joint (1) and the second pipe joint (2) are connected through a butt joint assembly (3), the butt joint assembly (3) is provided with a protection assembly (4) on the outer periphery, the protection assembly (4) is connected with the first pipe joint (1) and the second pipe joint (2); The connection between the first pipe joint (1), the second pipe joint (2) and the butt joint assembly (3) is located in the protection assembly (4); The protection assembly (4) comprises a fixed ring (22), the fixed ring (22) is provided with two groups, and the two groups of fixed rings (22) are fixedly connected to the first pipe joint (1) and the second pipe joint (2) respectively; A fixed block (31) is fixedly connected to the fixed ring (22), a rotating shaft (23) is rotatably connected to the fixed block (31), a trigger gear (24) is fixedly connected to the rotating shaft (23), the trigger gear (24) is engaged with an external gear ring (25), the external gear ring (25) is slidably connected to a fixed sliding block (37), the fixed sliding block (37) is fixedly connected to a fixed side plate (28), and the fixed side plate (28) is fixedly connected with the first pipe joint (1) and / or the second pipe joint (2); A blocking plate (26) is fixedly connected to the rotating shaft (23), adjacent blocking plates (26) are sealingly connected, the blocking plate (26) is slidingly and sealingly connected with the external gear ring (25), a sealing plate is fixedly connected to the fixed ring (22), and the sealing plate is slidingly and sealingly connected with the external gear ring (25); A gear is arranged on the outer side of the external gear ring (25), the gear on the outer side of the external gear ring (25) is engaged with a rack (30), the rack (30) is slidably connected to a bottom plate (27), and the bottom plate (27) is fixedly connected with the first pipe joint (1) and / or the second pipe joint (2); A trigger lever (29) is slidably connected to the bottom plate (27), and the trigger lever (29) is fixedly connected with the rack (30); A fixed side plate (28) is fixedly connected to the side of the bottom plate (27), a button is arranged on the fixed side plate (28), and the position of the button corresponds to the trigger lever (29); A fixed frame (45) is fixedly connected to the fixed side plate (28), a drive motor (38) is fixedly connected to the fixed frame (45), a drive shaft (41) is fixedly connected to the output end of the drive motor (38), and a cam (32) and a limiting rotating plate (39) are fixedly connected to the drive shaft (41); A drive sliding block (40) is fixedly connected to the limiting rotating plate (39); A drive disc (42) is rotatably connected to the fixed side plate (28), and an alarm lamp (43) is fixedly connected to the drive disc (42); A sliding groove (44) is arranged on the drive disc (42), and the drive sliding block (40) is slidably connected in the sliding groove (44); One end of a first connecting rod (33) is eccentrically connected to the cam (32), the other end of the first connecting rod (33) is rotatably connected to a sliding block (46), the sliding block (46) is slidably connected to the fixed side plate (28), one end of a second connecting rod (34) is rotatably connected to the sliding block (46), and the other end of the second connecting rod (34) is rotatably connected to a cover plate (35) slidably connected to the fixed side plate (28); A hole (36) is arranged on the fixed side plate (28). The button on the fixed side plate (28) is electrically connected with the driving motor (38).

2. The choke manifold for petroleum and preventing leakage according to claim 1, characterized in that, The docking assembly (3) comprises a first docking piece (301) and a second docking piece (302), the first docking piece (301) and the second docking piece (302) are fixedly connected to the first pipe joint (1) and the second pipe joint (2), fasteners (8) are arranged on the outer periphery of the first docking piece (301) and the second docking piece (302), and the first docking piece (301) and the second docking piece (302) are connected through the fasteners (8).

3. The choke manifold for petroleum and preventing leakage according to claim 2, characterized in that, The first docking piece (301) is slidably inserted with a first sleeve (12), and the second docking piece (302) is provided with a sleeve groove (15) for accommodating the first sleeve (12); The second docking piece (302) is provided with a second sleeve (13), the second sleeve (13) can be inserted into the first docking piece (301), and the second sleeve (13) is located inside the first sleeve (12); A first elastic piece (5) is arranged between the end of the first sleeve (12) located in the first docking piece (301) and the inner side of the first docking piece (301); The first docking piece (301) is slidably connected with a first pressing block (6), and the first pressing block (6) can be pressed to the outside of the first sleeve (12); The first pressing block (6) is fixedly connected with a first pressing rod (7), the first pressing rod (7) penetrates through the first docking piece (301), and the first pressing rod (7) is slidably connected to the first docking piece (301); A spring is arranged between the first pressing block (6) and the outer side wall of the first docking piece (301); An arc-shaped trigger groove (9) is arranged on the end face of the fastener (8) close to the first docking piece (301), and the first pressing rod (7) is slidably connected in the arc-shaped trigger groove (9); The distance between the outer edge of the arc-shaped trigger groove (9) and the outer side wall of the first docking piece (301) gradually changes along the rotation direction; A linkage rod (10) is slidably connected in the fastener (8), one end of the linkage rod (10) is located in the arc-shaped trigger groove (9), and an inclined surface is arranged on the side of the linkage rod (10) facing the first pressing rod (7); A limiting plate (16) is arranged on the linkage rod (10), and a second elastic piece (11) is arranged between the limiting plate (16) and the inner cavity of the fastener (8); A second pressing rod (18) is slidably connected in the fastener (8), one end of the second pressing rod (18) is located on the sliding track of the linkage rod (10), and an inclined surface is arranged on the side of the second pressing rod (18) facing the linkage rod (10); The second pressing rod (18) is fixedly connected with a second trigger pressing block (17), and the second trigger pressing block (17) is slidably connected to the second pressing rod (18); A spring is arranged between the second trigger pressing block (17) and the fastener (8). The first trigger pressing block (14) is slidably connected to the side wall of the second connecting piece (302), and a second pressing block (21) is fixedly connected to the first trigger pressing block (14), one end of the second pressing block (21) is located in the sleeve groove (15), and one end of the first trigger pressing block (14) is located on the surface of the side wall of the second connecting piece (302); A third elastic member (20) is arranged between the first trigger pressing block (14) and the inner cavity of the second connecting piece (302); A clamping block (19) is arranged on one side of the first trigger pressing block (14), the clamping block (19) can clamp the first trigger pressing block (14), the clamping block (19) is slidably connected to the inner cavity of the second connecting piece (302), and a spring is arranged between the clamping block (19) and the inner cavity of the second connecting piece (302); The first trigger pressing block (14) can abut against the second trigger pressing block (17).

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