Blowout preventer half-closed gate plate liquid path and control console gas path linkage device

Abstract

The application discloses a blowout preventer half-seal gate plate liquid path and console gas path linkage device, which comprises a main roller clutch and a pipeline, one end of the main roller clutch is connected with a hydraulic control gas valve mechanism, the gas outlet end of the hydraulic control gas valve mechanism is connected with a gas path tee joint and a foot-operated gas path emergency switch, a quick connection mechanism is installed on the pipeline, the hydraulic control gas valve mechanism comprises a hydraulic sealing shell, the end of the hydraulic sealing shell is fixedly installed with a gas valve shell, the gas valve shell is provided with an air inlet A port, an air outlet P port and an air outlet R port, and a piston rod is slidably connected in the hydraulic sealing shell, and belongs to the technical field of oilfield downhole operation. The blowout preventer half-seal gate plate liquid path and console gas path linkage device can change the gas path direction under the action of the pressure in the hydraulic pipeline through the hydraulic control gas valve mechanism, and the air cut-off and combination of the console main roller clutch are realized by cooperating with the foot-operated gas path emergency switch, so that the misoperation problem is solved from the nature safety of the equipment, and the safety of operation is improved.

Description

Technical Field

[0001] This invention relates to the field of oilfield downhole operation technology, specifically to a linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the gas circuit of the operator's console. Background Technology

[0002] Currently, during downhole operations in oilfields, if the blowout preventer (BOP) is not activated, operators may mistakenly raise or lower the tubing string. This could cause the tubing string to pull on the BOP gate, resulting in minor damage to well control equipment. In more serious cases, if a large-diameter tool is present in the tubing string, raising it could cause a surge in pressure within the wellbore, exceeding the pressure limit of the wellhead control equipment. This could potentially puncture weak points in the well control equipment or even cause injury or death.

[0003] Currently, two measures have been taken at the construction site to prevent accidental operation of the brake lever when lifting the tubing string. One is to hang a sign, and after personnel switch the blowout preventer on and off, flip the sign to indicate the switch status. The other is to conduct on-site safety confirmation. After the assistant driller operates the remote control console to switch the blowout preventer on and off, the site worker goes to the wellhead to observe the movement of the blowout preventer screw. Both of these methods can avoid some accidental operation situations, but they cannot fundamentally eliminate the occurrence of accidental operation. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a linkage device between the hydraulic circuit of the blowout preventer's semi-sealing gate and the air circuit of the driver's console, thus solving the aforementioned problems.

[0005] (II) Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solution: a linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the driver's console, including a main drum clutch and a pipeline, one end of the main drum clutch is connected to a hydraulically controlled air valve mechanism, the air outlet end of the hydraulically controlled air valve mechanism is connected to an air circuit tee and a foot-operated air circuit emergency switch, and a quick-connect mechanism is installed on the pipeline; The hydraulic control valve mechanism includes a hydraulic sealing shell, a valve shell is fixedly installed at the end of the hydraulic sealing shell, the valve shell is provided with an air inlet A port, an air outlet P port and an air outlet R port, a piston rod is slidably connected inside the hydraulic sealing shell, a first spring is provided on one side of the piston rod, a switching piston is slidably connected inside the valve shell, a second spring is fixedly connected to one end of the switching piston, and air passage grooves are provided at the top and bottom of the switching piston, and a through hole is provided between the two air passage grooves; The foot-operated gas emergency switch includes an emergency valve body with gas ports at the top and bottom. An emergency valve core is slidably connected inside the emergency valve body. A pull rod and a third spring are fixedly connected to the end of the emergency valve core. A limit pin is fixedly connected to the end of the pull rod. A rotating rod is provided on one side of the pull rod. A strip-shaped hole is opened at the top of the rotating rod. A support shaft is fixedly connected to the rotating rod. A support frame is rotatably connected to the support shaft. A base frame is provided at the bottom of the support shaft. A foot pedal is rotatably connected to one end of the base frame. A U-shaped push frame is fixedly connected to the top side of the foot pedal. A fourth spring is installed on the base frame.

[0006] Preferably, the air inlet of the hydraulic control air valve mechanism is connected to the main drum clutch, and the two air outlets of the hydraulic control air valve mechanism are respectively connected to the foot-operated air circuit emergency switch and the air circuit tee. The two air inlets of the air circuit tee are respectively connected to the hydraulic control air valve mechanism and the foot-operated air circuit emergency switch, and the air outlet of the air circuit tee is connected to the main drum clutch. This allows the hydraulic control air valve mechanism to change the air circuit direction under the pressure in the hydraulic pipeline, thereby realizing the air cut-off and engagement of the main drum clutch on the operator's console, and solving the problem of misoperation from the perspective of equipment inherent safety.

[0007] Preferably, both the hydraulic sealing shell and the valve shell are fixedly connected to flanges at their ends, and two adjacent flanges are detachably connected by bolts and nuts, which makes it convenient to disassemble and repair the hydraulic sealing shell and the valve shell.

[0008] Preferably, one end of the switching piston passes through the valve housing and extends to the outside of the valve housing, and one end of the piston rod passes through the hydraulic sealing housing and extends to the outside of the hydraulic sealing housing. The switching piston and the piston rod are matched so that the piston rod can drive the switching piston to move, thereby enabling the switching of the air circuit.

[0009] Preferably, the piston rod has three sealing grooves, and each of the three sealing grooves is fixedly connected with a sealing ring, which can meet the pressure requirements of 10.5-21MPa in the hydraulic pipeline and improve the sealing effect.

[0010] Preferably, the end of the pull rod passes through the emergency valve body and extends to the outside of the emergency valve body. The end of the pull rod is connected to the top of the rotating rod through a limiting pin and a strip hole, so that the pull rod can move horizontally when the rotating rod rotates.

[0011] Preferably, one end of the fourth spring is fixedly connected to the bottom end of the rotating rod, and the other end of the fourth spring is fixedly connected to the base frame, so that the rotating rod can be reset by using the fourth spring.

[0012] Preferably, the quick-connect mechanism includes a snap-fit ​​seat and a connector. An annular groove is formed on the inner wall of the snap-fit ​​seat. A plug is fixedly connected to the bottom end of the connector. A movable groove is formed inside the plug and the connector. Multiple steel balls are movably installed inside the movable groove. The steel balls partially penetrate the movable groove and extend to the outside of the groove, and the steel balls match the annular groove. A pressure plate is provided on the top of the multiple steel balls. A connecting rod is fixedly connected to the top of the pressure plate. The top of the connecting rod penetrates the connector and is fixedly connected to a fixing frame. Connecting seats are fixedly connected to both sides of the fixing frame. Locking seats are fixedly connected to both sides of the connector. A locking slot is formed on the locking seat. A slider is slidably connected inside the locking seat. A triangular locking block is fixedly connected to the bottom end of the slider. A fifth spring and a push block are fixedly connected to both sides of the slider, respectively, facilitating the assembly and disassembly of various devices.

[0013] This invention provides a linkage device between the hydraulic circuit of the blowout preventer's semi-sealing gate and the pneumatic circuit of the driver's console. Compared with the prior art, it has the following advantages: (1) The hydraulic circuit of the semi-sealed gate of the blowout preventer and the air circuit of the driver's console are linked. The hydraulic control air valve mechanism can change the direction of the air circuit under the pressure in the hydraulic pipeline. In conjunction with the foot-operated air circuit emergency switch, the air circuit can be cut off and engaged in the clutch of the main drum of the driver's console. This solves the problem of misoperation from the perspective of the inherent safety of the equipment and improves the safety of operation.

[0014] (2) The hydraulic circuit of the semi-sealed gate of the blowout preventer and the air circuit of the control panel are linked by inserting the plug into the snap-fit ​​seat, and then pressing down the fixing frame. The moving fixing frame drives the connecting rod to move, and the moving connecting rod drives the pressure plate to move, pushing the steel ball into the annular groove and fixing the fixing frame. The steel ball and the annular groove form a snap-fit, which makes it easy to disassemble and assemble each piece of equipment.

[0015] (3) The hydraulic circuit of the semi-sealed gate of the blowout preventer and the air circuit of the driver's console are linked by sealing rings fixedly connected inside the three sealing grooves, which can meet the pressure requirements of 10.5-21MPa in the hydraulic pipeline and improve the sealing effect. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a schematic diagram of the hydraulic control valve mechanism and quick-connect mechanism of the present invention; Figure 3 This is a schematic cross-sectional view of the hydraulic control valve mechanism of the present invention; Figure 4 This is a schematic diagram of the foot-operated pneumatic emergency switch structure of the present invention; Figure 5 This is a schematic diagram of the connection structure between the rotating rod and the emergency valve core of the present invention; Figure 6This is a schematic diagram of the quick-connect mechanism of the present invention; Figure 7 This is a schematic diagram of the connection structure between the fixing frame and the pressure plate of the present invention.

[0017] In the diagram: 1. Main drum clutch; 2. Hydraulic control pneumatic valve mechanism; 201. Hydraulic sealing housing; 202. Pneumatic valve housing; 203. Air inlet A port; 204. Air outlet P port; 205. Air outlet R port; 206. Piston rod; 207. First spring; 208. Switching piston; 209. Second spring; 210. Air passage groove; 211. Through hole; 212. Sealing ring; 3. Foot-operated pneumatic emergency switch; 301. Emergency valve body; 302. Connecting air port; 303. Emergency valve core; 304. Third spring; 305. Pull rod; 306. Limit pin; 307. 308. Rotating rod; 309. Strip hole; 310. Support shaft; 311. Support frame; 312. Base frame; 313. Foot pedal; 314. U-shaped push frame; 315. Fourth spring; 4. Air tee; 5. Quick-connect mechanism; 501. Snap-fit ​​seat; 502. Annular groove; 503. Connector; 504. Insert block; 505. Steel ball; 506. Locking seat; 507. Fixing frame; 508. Connecting rod; 509. Pressure plate; 510. Locking slot; 511. Connecting seat; 512. Slider; 513. Triangular snap block; 514. Push block; 515. Fifth spring. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-5This invention provides a technical solution: a linkage device between the hydraulic circuit of the blowout preventer's semi-sealing gate and the air circuit of the driver's console, including a main drum clutch 1 and pipelines. One end of the main drum clutch 1 is connected to a hydraulically controlled air valve mechanism 2. The outlet end of the hydraulically controlled air valve mechanism 2 is connected to an air circuit tee 4 and a foot-operated air circuit emergency switch 3. A quick-connect mechanism 5 is installed on the pipeline. The inlet end of the hydraulically controlled air valve mechanism 2 is connected to the main drum clutch 1. The two outlet ends of the hydraulically controlled air valve mechanism 2 are respectively connected to the foot-operated air circuit emergency switch 3 and the air circuit tee 4. The two air inlets are connected to the hydraulic control air valve mechanism 2 and the foot-operated air circuit emergency switch 3, respectively. The air outlet of the air circuit tee 4 is connected to the main drum clutch 1, so that the hydraulic control air valve mechanism 2 can change the air circuit direction under the action of pressure in the hydraulic pipeline, realize the air cut-off and engagement of the main drum clutch 1 on the operator's console, solve the problem of misoperation from the perspective of equipment inherent safety, and improve the safety of operation. In addition, the hydraulic control air valve mechanism 2 is connected to the hydraulic pipeline, and can use the hydraulic pressure in the hydraulic pipeline as power to drive the hydraulic control air valve mechanism 2 to work.

[0020] The hydraulic control valve mechanism 2 includes a hydraulic sealing housing 201, which is connected to a hydraulic pipeline. A valve housing 202 is fixedly installed at the end of the hydraulic sealing housing 201. Flanges are fixedly connected to the ends of both the hydraulic sealing housing 201 and the valve housing 202. Adjacent flanges are detachably connected by bolts and nuts, allowing for easy disassembly and maintenance of the hydraulic sealing housing 201 and the valve housing 202. The valve housing 202 has an inlet A port 203, an outlet P port 204, and an outlet R port 205. A piston rod 206 is slidably connected inside the hydraulic sealing housing 201. The piston rod 206 has three sealing grooves, each with a sealing ring 212 fixedly connected inside. This meets the pressure requirements of 10.5-21 MPa in the hydraulic pipeline, improving the sealing effect. A first spring 207 is provided on one side of the piston rod 206, allowing the blowout preventer to open. After the hydraulic pipeline is hydraulically disconnected, the piston rod 206 can be reset, changing the air path and valve. A switching piston 208 is slidably connected inside the housing 202. One end of the switching piston 208 passes through the valve housing 202 and extends to the outside of the valve housing 202. One end of the piston rod 206 passes through the hydraulic sealing housing 201 and extends to the outside of the hydraulic sealing housing 201. The switching piston 208 and the piston rod 206 are matched so that the piston rod 206 can drive the switching piston 208 to move, thereby switching the air path. A second spring 209 is fixedly connected to one end of the switching piston 208. Air passage grooves 210 are opened at the top and bottom of the switching piston 208. A through hole 211 is provided between the two air passage grooves 210. The air passage groove 210 at the top is always connected to the air inlet A port 203, and the air passage groove 210 at the bottom is always connected to the air outlet P port 204 or the air outlet R port 205. This allows the movement of the switching piston 208 to change the connection state between the air inlet A port 203 and the air outlet P port 204 or the air outlet R port 205, thereby changing the air path.

[0021] The foot-operated gas emergency switch 3 includes an emergency valve body 301. The emergency valve body 301 has connecting air ports 302 at both its top and bottom. An emergency valve core 303 is slidably connected inside the emergency valve body 301, positioned between the two connecting air ports 302, allowing the emergency valve body 301 to be in a normally closed state. A pull rod 305 and a third spring 304 are fixedly connected to the end of the emergency valve core 303. The third spring 304 can reset the emergency valve core 303. A limit pin 306 is fixedly connected to the end of the pull rod 305. A rotating rod 307 is provided on one side of the pull rod 305. A slotted hole 308 is opened at the top of the rotating rod 307. The end of the pull rod 305 passes through the emergency valve body 301 and extends to the outside of the emergency valve body 301. The end of the pull rod 305 is connected to the top of the rotating rod 307 through the limit pin 306 and the slotted hole 308, so that when the rotating rod 307 rotates, it can drive the pull rod 305 to move horizontally. The rotating rod 307 is fixedly connected to a support shaft 309, and a support frame 310 is rotatably connected to the support shaft 309. A base frame 311 is provided at the bottom end of the support shaft 309. A foot pedal 312 is rotatably connected to one end of the base frame 311. The angle between the foot pedal 312 and the base frame 311 is 10 degrees to 70 degrees, which can limit the foot pedal 312 so that it can easily push the rotating rod 307 to rotate. A U-shaped push frame 313 is fixedly connected to one side of the top of the foot pedal 312. The U-shaped push frame 313 is sleeved on the rotating rod 307, which can easily push the bottom end of the rotating rod 307 to rotate. A fourth spring 314 is installed on the base frame 311. One end of the fourth spring 314 is fixedly connected to the bottom end of the rotating rod 307, and the other end of the fourth spring 314 is fixedly connected to the base frame 311, which can be used to reset the rotating rod 307.

[0022] Please see Figure 2 , Figure 6 and Figure 7The quick-connect mechanism 5 includes a snap-fit ​​seat 501 and a connector 503. The snap-fit ​​seat 501 is fixedly installed on each air port, thus facilitating the connection of pipelines to various devices. An annular groove 502 is formed on the inner wall of the snap-fit ​​seat 501. A plug block 504 is fixedly connected to the bottom end of the connector 503. A movable groove is formed inside the plug block 504 and the connector 503. Multiple steel balls 505 are movably installed inside the movable groove. The multiple steel balls 505 partially penetrate the movable groove and extend to the outside of the movable groove, and the steel balls 505 match the annular groove 502. A pressure plate 509 is provided on the top of the multiple steel balls 505. A connecting rod 508 is fixedly connected to the top of the pressure plate 509. The top of the connecting rod 508 penetrates the connector 503 and is fixedly connected to a fixing bracket 507. Connecting seats 511 are fixedly connected to both sides of the fixing bracket 507. Locking seats 506 are fixedly connected to both sides of the connector 503. A locking slot 510 is formed on the locking seat 506. A slider 512 is slidably connected inside the locking seat 506. A triangular locking block 513 is fixedly connected to the bottom of the slider 512. A fifth spring 515 and a push block 514 are fixedly connected to both sides of the slider 512. By inserting the insert block 504 into the locking seat 501 and then pressing down the fixing frame 507, the moving fixing frame 507 drives the moving connecting rod 508, which in turn drives the moving pressure plate 509, pushing the steel ball 505 into the annular groove 502. During this process, the triangular locking block 513 uses the inclined surface force to drive the slider 512 to move. The movement of the slider 512 compresses the fifth spring 515. After the triangular locking block 513 is fully inserted into the locking slot 510, the fifth spring 515 resets the triangular locking block 513 and fixes the fixing frame 507. The steel ball 505 and the annular groove 502 form a locking connection, which facilitates the assembly and disassembly of various devices.

[0023] When in use, the blowout preventer is closed, the hydraulic pressure in the hydraulic line increases, and the hydraulic pressure pushes the piston rod 206 to move. The piston rod 206 moves and pushes the switching piston 208 to move, switching the air route from the air inlet A port 203 to the air outlet R port 205 to the air outlet P port 204, and flowing to the emergency valve body 301. By stepping on the foot pedal 312, the foot pedal 312 rotates and drives the U-shaped pusher 313 to move. The movement of the U-shaped pusher 313 pushes the rotating rod 307 to rotate. The rotation of the rotating rod 307 drives the pull rod 305 to move. The movement of the pull rod 305 drives the emergency valve core 303 to move, sending the gas into the main drum clutch 1. When the blowout preventer opens, the hydraulic lines are hydraulically disconnected. The first spring 207 and the second spring 209 reset the piston rod 206 and the switching piston 208 respectively, switching the air route from the inlet A port 203 to the outlet P port 204 to the outlet R port 205, and directly flowing to the main drum clutch 1. This achieves the disconnection and engagement of the main drum clutch 1 on the operator's console, solving the problem of misoperation from the perspective of equipment inherent safety and improving operational safety.

[0024] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A linkage device between the hydraulic circuit of the semi-sealed gate of the blowout preventer and the pneumatic circuit of the driver's console, comprising a main drum clutch (1) and pipelines, characterized in that: One end of the main drum clutch (1) is connected to a hydraulic control air valve mechanism (2), and the outlet end of the hydraulic control air valve mechanism (2) is connected to an air passage tee (4) and a foot-operated air passage emergency switch (3). A quick-connect mechanism (5) is installed on the pipeline. The hydraulic control valve mechanism (2) includes a hydraulic sealing shell (201), and a valve shell (202) is fixedly installed at the end of the hydraulic sealing shell (201). The valve shell (202) is provided with an air inlet A port (203), an air outlet P port (204), and an air outlet R port (205). A piston rod (206) is slidably connected inside the hydraulic sealing shell (201). A first spring (207) is provided on one side of the piston rod (206). A switching piston (208) is slidably connected inside the valve shell (202). A second spring (209) is fixedly connected to one end of the switching piston (208). An air passage groove (210) is provided at the top and bottom of the switching piston (208). A through hole (211) is provided between the two air passage grooves (210). The foot-operated gas emergency switch (3) includes an emergency valve body (301), with connecting air ports (302) at both the top and bottom of the emergency valve body (301). An emergency valve core (303) is slidably connected inside the emergency valve body (301). A pull rod (305) and a third spring (304) are fixedly connected to the end of the emergency valve core (303). A limit pin (306) is fixedly connected to the end of the pull rod (305). A rotating rod (307) is provided on one side of the pull rod (305). A strip-shaped hole (308) is provided at the top of the rod (307). A support shaft (309) is fixedly connected to the rotating rod (307). A support frame (310) is rotatably connected to the support shaft (309). A base frame (311) is provided at the bottom of the support shaft (309). A foot pedal (312) is rotatably connected to one end of the base frame (311). A U-shaped push frame (313) is fixedly connected to one side of the top of the foot pedal (312). A fourth spring (314) is installed on the base frame (311).

2. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the control panel according to claim 1, characterized in that: The air inlet of the hydraulic control air valve mechanism (2) is connected to the main drum clutch (1). The two air outlets of the hydraulic control air valve mechanism (2) are connected to the foot-operated air circuit emergency switch (3) and the air circuit tee (4) respectively. The two air inlets of the air circuit tee (4) are connected to the hydraulic control air valve mechanism (2) and the foot-operated air circuit emergency switch (3) respectively. The air outlet of the air circuit tee (4) is connected to the main drum clutch (1).

3. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the control panel according to claim 1, characterized in that: The ends of the hydraulic sealing shell (201) and the valve shell (202) are both fixedly connected with flanges, and two adjacent flanges are detachably connected by bolts and nuts.

4. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the control panel according to claim 1, characterized in that: One end of the switching piston (208) passes through the valve housing (202) and extends to the outside of the valve housing (202), and one end of the piston rod (206) passes through the hydraulic sealing housing (201) and extends to the outside of the hydraulic sealing housing (201). The switching piston (208) is matched with the piston rod (206).

5. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the driver's console according to claim 1, characterized in that: The piston rod (206) has three sealing grooves, and a sealing ring (212) is fixedly connected inside each of the three sealing grooves.

6. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the driver's console according to claim 1, characterized in that: The end of the pull rod (305) passes through the emergency valve body (301) and extends to the outside of the emergency valve body (301). The end of the pull rod (305) is connected to the top of the rotating rod (307) through a limiting pin (306) and a strip hole (308).

7. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the driver's console according to claim 1, characterized in that: One end of the fourth spring (314) is fixedly connected to the bottom end of the rotating rod (307), and the other end of the fourth spring (314) is fixedly connected to the base frame (311).

8. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the control panel according to claim 1, characterized in that: The quick-connect mechanism (5) includes a snap-fit ​​seat (501) and a connector (503). The snap-fit ​​seat (501) has an annular groove (502) on its inner wall. The connector (503) has a plug (504) fixedly connected to its bottom end. The plug (504) and the connector (503) have movable grooves inside. Multiple steel balls (505) are movably installed inside the movable grooves.

9. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the control panel according to claim 8, characterized in that: Multiple steel balls (505) partially penetrate the movable groove and extend to the outside of the movable groove, and the steel balls (505) are matched with the annular groove (502).

10. The linkage device between the hydraulic circuit of the blowout preventer semi-sealing gate and the air circuit of the control panel according to claim 8, characterized in that: A pressure plate (509) is provided on the top of the multiple steel balls (505). A connecting rod (508) is fixedly connected to the top of the pressure plate (509). The top of the connecting rod (508) passes through the connector (503) and is fixedly connected to the fixing frame (507). A connecting seat (511) is fixedly connected to both sides of the fixing frame (507). A locking seat (506) is fixedly connected to both sides of the connector (503). A locking slot (510) is provided on the locking seat (506). A slider (512) is slidably connected inside the locking seat (506). A triangular locking block (513) is fixedly connected to the bottom of the slider (512). A fifth spring (515) and a push block (514) are fixedly connected to both sides of the slider (512).

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