Slurry-overflowing-preventing hybrid self-locking wellhead device

Abstract

The invention relates to the technical field of well mouth self-locking devices, in particular to a slurry overflowing prevention hybrid power well mouth self-locking device. According to the technical scheme, the valve comprises a valve body fixedly installed on a sleeve through a flange and further comprises a plugging component fixedly installed on the valve body and used for sealing the valve body, the plugging component comprises a plugging piece, and the plugging piece comprises two semicircular valve plates installed in the valve body; the plugging component further comprises installation boxes fixedly installed on the two sides of the valve body, inclined guide plates are fixedly installed in the installation boxes, and the valve plate is connected with the guide plates in a sliding mode. According to the device, in the drilling construction process, under the condition that equipment such as a drilling tool exists in a drill hole, grouting liquid is prevented from overflowing from a wellhead, the ecological environment risk is reduced, and the economic cost and the time cost of environment recovery after grouting liquid overflowing are saved; meanwhile, whether construction can be continued or not can be judged according to the pressure and flow of the slurry under pressure, and therefore the engineering purpose is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of self-locking wellhead devices, and in particular to an anti-slurry hybrid self-locking wellhead device. Background Art

[0002] As my country's primary energy source, coal plays a vital role in the national economy. Coal mines with complex geological conditions and uneven coal seam thicknesses produce large quantities of gangue. Technically, economically, and ecologically, the comprehensive utilization of gangue is limited. Failure to effectively process gangue can hinder coal washing progress and, in turn, coal production. Therefore, a new and widely adopted method for gangue disposal is to mix crushed gangue with water and fill the separated space formed after coal mining.

[0003] Due to the high slurry pressure in the abscission zone, when constructing new grouting holes or inspection holes, slurry may emerge from the holes, making it impossible to construct the holes and causing a significant impact on the ecological environment. Summary of the Invention

[0004] The purpose of the present invention is to address the problems existing in the background technology and to propose a slurry-proof hybrid self-locking wellhead device that can automatically and quickly seal the borehole when slurry is sprayed out.

[0005] The technical solution of the present invention is a hybrid self-locking wellhead device for preventing slurry from leaking, comprising a valve body fixedly mounted on a casing via a flange, and further comprising:

[0006] A blocking component fixedly mounted on the valve body to seal the valve body, the blocking component including a blocking member, the blocking member including two semicircular valve plates mounted inside the valve body, the valve plates moving in both horizontal and vertical directions, the blocking component also including a mounting box fixedly mounted on both sides of the valve body, an inclined guide plate fixedly mounted in the mounting box, the valve plates being slidably connected to the guide plates;

[0007] The sealing component also includes a mechanical locking module, which includes a push rod motor that drives the valve plate to move. The push rod motor has two sets of circuits in parallel, one set of which is connected when the valve plate moves to the set position, and the other set of circuits is controlled by a controller.

[0008] Optionally, a connecting arm is slidably mounted on the mounting box, and the connecting arm is fixedly connected to the valve plate via bolts. A sealing sheet is fixedly mounted on the valve plate, and a through hole is provided on the valve plate.

[0009] Optionally, the mechanical locking module also includes a connecting sleeve fixedly mounted on the connecting arm, a transmission rod slidably mounted in the connecting sleeve, a connecting shaft slidably connected to the mounting box is fixedly mounted on the transmission rod, and the push rod motor is fixedly connected to the connecting shaft.

[0010] Optionally, the mechanical locking module also includes a guide block fixedly mounted on the connecting shaft, one end of the guide block is provided with a bevel, a connecting strip is slidably mounted in the mounting box, a first spring is fixedly mounted between the connecting strip and the mounting box, a mounting seat is rotatably mounted on one end of the connecting strip, a guide wheel is rotatably mounted on the mounting seat, a first contact is fixedly mounted on the other end of the connecting strip, a second contact is slidably mounted in the mounting box, a second spring is fixedly mounted between the second contact and the mounting box, and when the first contact and the second contact are in contact, a closed circuit is formed between the first contact and the second contact and the push rod motor and the power supply.

[0011] Optionally, a clamping rod is slidably installed in the installation box, a clamping groove is provided on the connecting strip, a third spring is fixedly installed between the clamping rod and the installation box, a push rod is fixedly installed on the clamping rod, a push plate is installed on one side of the guide block, and a limiting plate is fixedly installed on the bottom end of the connecting strip.

[0012] Optionally, a synchronization component is installed in the installation box, and the synchronization component controls the connecting shafts on both sides to move synchronously in opposite directions.

[0013] Optionally, the synchronization assembly includes a synchronization rod fixedly connected to the connecting shaft, a sealing plate fixedly mounted on the synchronization rod, a synchronization cylinder fixedly mounted on the mounting box, the sealing plate is sealed and slidably connected to the synchronization cylinder, and both ends of the synchronization cylinder are connected through an oil pipe.

[0014] Optionally, the synchronization cylinder and the oil pipe are both filled with a hydraulic medium, and the hydraulic medium is a liquid that cannot be compressed under a working environment.

[0015] Optionally, a reinforced anti-loosening component is installed in the installation box to prevent a gap from appearing between the two valve plates. The reinforced anti-loosening component includes a force-bearing plate fixedly installed on the connecting shaft, and the bottom end of the force-bearing plate is provided with a conical surface. A fourth spring is fixedly installed in the installation box, and a base slidingly connected to the installation box is fixedly installed on the fourth spring, and a pressure wheel is rotatably installed on the base.

[0016] Optionally, a first elastically deformable sealing plate is fixedly installed in the installation box, the first sealing plate is fixedly connected to the connecting arm, a movable groove is provided on the valve body, the height of the movable groove is greater than the height of the valve plate, and a second elastically deformable sealing plate is fixedly installed between the valve plate and the end face of the movable groove.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] The present invention can prevent grouting fluid from escaping from the wellhead during the drilling construction process when there are drilling tools and other equipment in the borehole, thereby reducing ecological and environmental risks and saving the economic and time costs of environmental restoration after grouting. At the same time, it can determine whether to continue construction based on the pressure and flow of the grouting fluid, thereby achieving the engineering purpose.

[0019] The high-pressure slurry's own energy is further utilized as a signal source, eliminating manual judgment or sensor transmission delay, achieving millisecond-level startup, and applying mechanical force to the valve plate 411 through mechanical locking, which can completely eliminate gap jets and improve the sealing level. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the self-locking wellhead device Figure 1 ;

[0021] Figure 2 Schematic diagram of the structure of the self-locking wellhead device Figure 2 ;

[0022] Figure 3 Schematic diagram of the structure of the self-locking wellhead device Figure 3 ;

[0023] Figure 4 Schematic diagram of the structure of the self-locking wellhead device Figure 4 ;

[0024] Figure 5 Schematic diagram of the structure of the blocking piece;

[0025] Figure 6 It is a structural diagram of the synchronization component;

[0026] Figure 7 for Figure 2 A partial enlarged view of point A in the middle;

[0027] Figure 8 for Figure 2 A partial enlarged view of point B in the middle;

[0028] Figure 9 for Figure 3 A partial enlarged view of point C in the middle;

[0029] Figure 10 for Figure 3 A partial enlarged view of point D in the middle;

[0030] Figure 11 for Figure 4 A partial enlarged view of point E in the middle;

[0031] Figure 12 Schematic diagram of the structure inside the borehole;

[0032] Figure 13 Schematic diagram of the valve plate structure.

[0033] Figure numerals: 1, sleeve; 2, flange; 3, valve body; 31, guide tube; 32, conical cover plate; 33, movable groove; 34, second sealing plate; 4, sealing component; 41, sealing member; 411, valve plate; 412, sealing plate; 413, through hole; 414, connecting arm; 415, bolt; 42, mounting box; 43, guide plate; 44, mechanical locking module; 441, connecting sleeve; 442, transmission rod; 443, connecting shaft; 444, push rod motor; 445, guide block; 446, inclined plane; 447, connecting strip; 448, first spring; 449, mounting seat; 4410, guide wheel; 4411, card Connecting groove; 4412, first contact; 4413, second contact; 4414, second spring; 4415, connecting rod; 4416, third spring; 4417, push rod; 4418, push plate; 4419, limit plate; 45, synchronization assembly; 451, synchronization rod; 452, sealing plate; 453, synchronization cylinder; 454, oil pipe; 46, reinforced anti-loosening assembly; 461, force plate; 462, conical surface; 463, fourth spring; 464, base; 465, pressure wheel; 47, first sealing plate; 5, drill pipe; 6, ground; 61, drilling hole; 62, mud pool; 63, mud pump; 64, slurry storage device. DETAILED DESCRIPTION

[0034] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0036] like Figures 1 to 5 and Figure 12As shown, the present invention proposes a hybrid self-locking wellhead device for preventing slurry from escaping, including a valve body 3 fixedly mounted on a casing 1 through a flange 2, the casing 1 is located inside a borehole 61, and a conical cover plate 32 and a guide pipe 31 are fixedly mounted on the valve body 3. When the valve body 3 is not blocked, the slurry can be discharged through the guide pipe 31, and the drill pipe 5 will enter the interior of the casing 1 through the valve body 3, and a mud pool 62 is provided on the ground 6 and a slurry storage device 64 is installed, and the slurry inside the slurry storage device 64 is input into the mud pool 62 through a mud pump 63.

[0037] As an embodiment, the anti-slurry hybrid self-locking wellhead device of this embodiment further includes a sealing component 4 fixedly mounted on the valve body 3 to seal the valve body 3, the sealing component 4 includes a sealing component 41, the sealing component 41 includes two semicircular valve plates 411 mounted inside the valve body 3, the valve plates 411 move in both horizontal and vertical directions, the sealing component 4 further includes an installation box 42 fixedly mounted on both sides of the valve body 3, an inclined guide plate 43 is fixedly mounted in the installation box 42, the valve plate 411 is slidably connected to the guide plate 43, When the two valve plates 411 are in contact with each other and closed, the valve body 3 can be blocked to prevent mud from flowing out through the valve body 3. When the hydraulic pressure inside the borehole 61 suddenly increases, the rising mud will push the valve plate 411 to rise, and under the action of the guide plate 43, the valve plates 411 on both sides will be close to each other. At this time, the valve plate 411 will be initially closed under the action of the mud impact force. However, the valve plate 411 cannot be completely closed under the action of mud alone. At this time, the valve plate 411 needs to be closed by an active drive component.

[0038] like Figures 1 to 5 and Figure 7 As shown, in this embodiment, a first elastically deformable sealing plate 47 is fixedly installed in the installation box 42. The first sealing plate 47 can prevent mud from entering the interior of the installation box 42 and prevent the components inside the installation box 42 from being contaminated. The first sealing plate 47 is fixedly connected to the connecting arm 414. A movable groove 33 is provided on the valve body 3. The height of the movable groove 33 is greater than the height of the valve plate 411, so that the valve plate 411 can move up and down on the valve body 3 to a certain extent. An elastically deformable second sealing plate 34 is fixedly installed between the valve plate 411 and the end face of the movable groove 33. The second sealing plate 34 can always ensure the sealing state between the valve plate 411 and the valve body 3, prevent the seal from failing when the valve plate 411 is raised or lowered, and prevent mud from entering the interior of the installation box 42.

[0039] like Figure 8 、 Figure 9 、 Figure 11 and Figure 13As shown, in this embodiment, the sealing component 4 also includes a mechanical locking module 44, which includes a push rod motor 444 that drives the valve plate 411 to move. The push rod motor 444 is connected to two sets of circuits in parallel, one of which is connected when the valve plate 411 moves to the set position, and the other is controlled by a controller. The controller can autonomously control the closing state of the valve plate 411. Under the setting of the other set of circuits, the valve plate 411 can be initially driven by mud, and after the valve plate 411 is initially moved, the circuit of the push rod motor 444 is automatically connected, which can realize a hybrid drive valve plate 411 to close. The energy of the high-pressure slurry itself is used as a "signal source", eliminating manual judgment or sensor transmission delay, achieving millisecond-level startup, and applying mechanical force to the valve plate 411 through mechanical locking, which can completely eliminate gap jets and improve the sealing level.

[0040] Among them, a connecting arm 414 is slidably installed on the installation box 42, and the connecting arm 414 is fixedly connected to the valve plate 411 by a bolt 415. A sealing plate 412 is fixedly installed on the valve plate 411, and a through hole 413 is provided on the valve plate 411. In this embodiment, the through hole 413 in the valve plate 411 has a variety of different inner diameters, which can be selected according to drill rods with different outer diameters, and the selected valve plate 411 is fixedly connected to the connecting arm 414.

[0041] Furthermore, the mechanical locking module 44 also includes a connecting sleeve 441 fixedly mounted on the connecting arm 414, a transmission rod 442 is slidably mounted in the connecting sleeve 441, a connecting shaft 443 slidably connected to the mounting box 42 is fixedly mounted on the transmission rod 442, and a push rod motor 444 is fixedly connected to the connecting shaft 443. When the valve plate 411 is raised and lowered under the action of mud, it will move along the guide plate 43 and will drive the connecting shaft 443 to move through the transmission rod 442. The connecting shaft 443 can be pushed or pulled by the push rod motor 444 to move, and the valve plate 411 can be actively closed or opened.

[0042] It should be noted that the push rod motor 444 is essentially a motor + transmission mechanism, usually a combination of a screw and nut mechanism. Since the core transmission mechanism of the push rod was originally designed to transmit motion with high efficiency and low friction, the friction angle between its threaded contact surfaces is very small. When the power is off, if the push rod body is subjected to a sufficiently large external axial force, this external force will overcome the static friction remaining in the screw and nut pair, causing the nut to rotate relative to the screw, thereby allowing the rod body to move freely. Therefore, when the power is off, the push rod motor 444 can freely extend and retract, and after the valve plate 411 is sealed, a device for applying pressure and locking the valve plate 411 needs to be set.

[0043] Furthermore, the mechanical locking module 44 also includes a guide block 445 fixedly mounted on the connecting shaft 443, one end of the guide block 445 is provided with a slope 446, a connecting strip 447 is slidably installed in the installation box 42, a first spring 448 is fixedly installed between the connecting strip 447 and the installation box 42, one end of the connecting strip 447 is rotatably mounted with a mounting seat 449, and a guide wheel 4410 is rotatably mounted on the mounting seat 449. When the connecting shaft 443 moves, it will drive the guide block 445 to move, and make the slope 446 contact with the guide wheel 4410, and push the guide wheel 4410 to rise, which can drive the connecting strip 447 to rise. When the guide block 445 does not support the guide wheel 4410, it will drive the connecting strip 447 to move downward under the action of the first spring 448.

[0044] Among them, the other end of the connecting strip 447 is fixedly installed with a first contact 4412, and the second contact 4413 is slidably installed in the installation box 42. When the connecting strip 447 rises under the action of the guide block 445, it will drive the first contact 4412 to rise, so that the first contact 4412 and the second contact 4413 are in contact. A second spring 4414 is fixedly installed between the second contact 4413 and the installation box 42, which can ensure the stability of the connection between the first contact 4412 and the second contact 4413. When the first contact 4412 and the second contact 4413 are in contact, a closed circuit is formed between the first contact 4412 and the second contact 4413 and the push rod motor 444 and the power supply. At this time, the push rod motor 444 will be started, and the valve plate 411 will be pushed to close under the action of the push rod motor 444.

[0045] It is worth noting that after the guide block 445 is separated from the bottom of the guide wheel 4410, the connecting bar 447 will drop, causing the first contact 4412 and the second contact 4413 to be disconnected. Therefore, it is necessary to limit the connecting bar 447 at this time. A clamping rod 4415 is slidably installed in the installation box 42, and a clamping groove 4411 is provided on the connecting bar 447. The clamping rod 4415 can be inserted into the clamping groove 4411 to limit the connecting bar 447. A third spring 4416 is fixedly installed between the clamping rod 4415 and the installation box 42. Under the action of the third spring 4416, the clamping rod 4415 enters the clamping groove 4411 when it is not affected by external force. A push rod 4417 is fixedly installed on the clamping rod 4415, and a push plate 4418 is installed on one side of the guide block 445. When the push rod motor 444 drives the connecting shaft 443 to move to the limit When the valve plate 411 is in the closed position, the push plate 4418 will push the push rod 4417, thereby driving the clamping rod 4415 to disengage from the clamping groove 4411, and under the action of the first spring 448, the first contact 4412 and the second contact 4413 will be disconnected. At this time, the push rod motor 444 does not move, and the valve plate 411 is in a fully closed state. The bottom end of the connecting strip 447 is fixedly installed with a limit plate 4419. When the valve plate 411 is opened by the controller, the push rod motor 444 will drive the connecting shaft 443 to move in the opposite direction. At this time, the guide block 445 contacts the mounting seat 449 and pushes the mounting seat 449 to rotate, and will not drive the first contact 4412 to rise. When the guide block 445 moves forward, the mounting seat 449 cannot rotate due to the action of the limit plate 4419. At this time, the first contact 4412 can be pushed to rise.

[0046] like Figure 6 As shown, as an embodiment, a synchronization component 45 is installed in the installation box 42, and the synchronization component 45 controls the synchronous reverse movement of the connecting shafts 443 on both sides. Since the impact force of the mud on the valve plates 411 on both sides may be different, the synchronization component 45 is required to keep the valve plates 411 on both sides in a synchronous state during the initial movement. The synchronization component 45 includes a synchronization rod 451 fixedly connected to the connecting shaft 443, a sealing plate 452 fixedly installed on the synchronization rod 451, and a synchronization cylinder 453 fixedly installed on the installation box 42. The sealing plate 452 and the synchronization cylinder 453 is sealed and slidably connected. Both ends of the synchronization cylinder 453 are connected through the oil pipe 454. The synchronization cylinder 453 and the oil pipe 454 are filled with hydraulic medium. The hydraulic medium is a liquid that cannot be compressed under the working environment. When one of the connecting shafts 443 moves, it will drive the synchronization rod 451 to move. The moving synchronization rod 451 will drive the sealing plate 452 to move. The moving sealing plate 452 will push the hydraulic medium, and through the transmission of the oil pipe 454, the synchronization rods 451 on both sides can move synchronously in opposite directions.

[0047] Further, such as Figure 10 As shown, a reinforcement anti-loosening assembly 46 is installed in the installation box 42 to prevent a gap from appearing between the two valve plates 411. The reinforcement anti-loosening assembly 46 includes a force-bearing plate 461 fixedly installed on the connecting shaft 443. The bottom end of the force-bearing plate 461 is provided with a conical surface 462. A fourth spring 463 is fixedly installed in the installation box 42. A base 464 that is slidably connected to the installation box 42 is fixedly installed on the fourth spring 463. A pressure wheel 465 is rotatably installed on the base 464. When the connection When the connecting shaft 443 moves forward to close the valve plate 411, it will drive the force-bearing plate 461 to move. The moving force-bearing plate 461 will gradually approach the pressure wheel 465 and squeeze the pressure wheel 465 downward. When the valve plate 411 is completely closed, the pressure wheel 465 will move to the other side of the conical surface 462 and apply pressure to the force-bearing plate 461 under the action of the fourth spring 463, thereby applying pressure to the connecting shaft 443, thereby preventing the valve plate 411 from loosening.

[0048] In this embodiment, when the hydraulic pressure inside the borehole 61 suddenly increases, the rising mud will push the valve plate 411 upward, and under the action of the guide plate 43, the valve plates 411 on both sides will move closer to each other. At this time, the valve plates 411 will be initially closed under the action of the mud impact force.

[0049] When the valve plate 411 is raised and lowered under the action of the mud, it will move along the guide plate 43 and drive the connecting shaft 443 to move through the transmission rod 442. When the connecting shaft 443 moves, it will drive the guide block 445 to move, and make the inclined surface 446 contact with the guide wheel 4410, and push the guide wheel 4410 to rise, which can drive the connecting bar 447 to rise. When the connecting bar 447 rises under the action of the guide block 445, it will drive the first contact 4412 to rise, so that the first contact 4412 and the second contact 4413 are in contact. When the first contact 4412 and the second contact 4413 are in contact, a closed circuit is formed between the first contact 4412 and the second contact 4413 and the push rod motor 444 and the power supply. At this time, the push rod motor 444 will be started, and the valve plate 411 will be pushed to close under the action of the push rod motor 444.

[0050] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art may make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A slurry prevention hybrid self-locking wellhead device, comprising a valve body (3) fixedly mounted on a casing (1) via a flange (2), characterized in that: Also includes: a blocking component (4) fixedly mounted on the valve body (3) for sealing the valve body (3), the blocking component (4) comprising a blocking component (41), the blocking component (41) comprising two semicircular valve plates (411) mounted inside the valve body (3), the valve plates (411) moving in both horizontal and vertical directions, the blocking component (4) further comprising a mounting box (42) fixedly mounted on both sides of the valve body (3), an inclined guide plate (43) fixedly mounted in the mounting box (42), the valve plates (411) being slidably connected to the guide plates (43); The blocking component (4) further includes a mechanical locking module (44), the mechanical locking module (44) including a push rod motor (444) for driving the valve plate (411) to move, the push rod motor (444) being connected in parallel with two sets of circuits, one of which is connected when the valve plate (411) moves to a set position, and the other is controlled by a controller.

2. The anti-slurry hybrid self-locking wellhead device according to claim 1 is characterized in that: A connecting arm (414) is slidably mounted on the mounting box (42), and the connecting arm (414) is fixedly connected to the valve plate (411) via a bolt (415). A sealing sheet (412) is fixedly mounted on the valve plate (411), and a through hole (413) is provided on the valve plate (411).

3. The anti-slurry hybrid self-locking wellhead device according to claim 2 is characterized in that: The mechanical locking module (44) further comprises a connecting sleeve (441) fixedly mounted on the connecting arm (414), a transmission rod (442) being slidably mounted in the connecting sleeve (441), a connecting shaft (443) being slidably connected to the installation box (42) being fixedly mounted on the transmission rod (442), and the push rod motor (444) being fixedly connected to the connecting shaft (443).

4. The anti-slurry hybrid self-locking wellhead device according to claim 3 is characterized in that: The mechanical locking module (44) further comprises a guide block (445) fixedly mounted on the connecting shaft (443), one end of the guide block (445) being provided with an inclined surface (446), a connecting strip (447) being slidably mounted in the mounting box (42), a first spring (448) being fixedly mounted between the connecting strip (447) and the mounting box (42), one end of the connecting strip (447) being rotatably mounted with a mounting seat (449), a guide wheel (448) being rotatably mounted on the mounting seat (449), 410), a first contact (4412) is fixedly installed at the other end of the connecting strip (447), a second contact (4413) is slidably installed in the installation box (42), a second spring (4414) is fixedly installed between the second contact (4413) and the installation box (42), and when the first contact (4412) and the second contact (4413) are in contact, a closed circuit is formed between the first contact (4412) and the second contact (4413) as well as the push rod motor (444) and the power supply.

5. The anti-slurry hybrid self-locking wellhead device according to claim 4 is characterized in that: A clamping rod (4415) is slidably installed in the installation box (42), a clamping groove (4411) is provided on the connecting strip (447), a third spring (4416) is fixedly installed between the clamping rod (4415) and the installation box (42), a push rod (4417) is fixedly installed on the clamping rod (4415), a push plate (4418) is installed on one side of the guide block (445), and a limiting plate (4419) is fixedly installed on the bottom end of the connecting strip (447).

6. The anti-slurry hybrid self-locking wellhead device according to claim 5, characterized in that: A synchronization component (45) is installed in the installation box (42), and the synchronization component (45) controls the connection shafts (443) on both sides to move synchronously in opposite directions.

7. The anti-slurry hybrid self-locking wellhead device according to claim 6, characterized in that: The synchronization assembly (45) includes a synchronization rod (451) fixedly connected to the connecting shaft (443), a sealing plate (452) fixedly mounted on the synchronization rod (451), a synchronization cylinder (453) fixedly mounted on the mounting box (42), the sealing plate (452) and the synchronization cylinder (453) are sealed and slidably connected, and both ends of the synchronization cylinder (453) are connected through an oil pipe (454).

8. The anti-slurry hybrid self-locking wellhead device according to claim 7, characterized in that: The synchronous cylinder (453) and the oil pipe (454) are both filled with a hydraulic medium, which is a liquid that cannot be compressed under a working environment.

9. The anti-slurry hybrid self-locking wellhead device according to claim 8, characterized in that: A reinforced anti-loosening assembly (46) is installed in the installation box (42) to prevent a gap from appearing between the two valve plates (411). The reinforced anti-loosening assembly (46) includes a force-bearing plate (461) fixedly installed on the connecting shaft (443). The bottom end of the force-bearing plate (461) is provided with a conical surface (462). A fourth spring (463) is fixedly installed in the installation box (42). A base (464) slidably connected to the installation box (42) is fixedly installed on the fourth spring (463), and a pressure wheel (465) is rotatably installed on the base (464).

10. The anti-slurry hybrid self-locking wellhead device according to claim 9, characterized in that: A first elastically deformable sealing plate (47) is fixedly installed in the installation box (42), and the first sealing plate (47) is fixedly connected to the connecting arm (414). A movable groove (33) is provided on the valve body (3), and the height of the movable groove (33) is greater than the height of the valve plate (411). A second elastically deformable sealing plate (34) is fixedly installed between the valve plate (411) and the end surface of the movable groove (33).

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