A pressure self-locking casing head with a quick connection structure

Abstract

The present application relates to the technical field of casing head, specifically to a pressure self-locking casing head with quick connecting structure, comprising a body, the inside of the body is uniformly distributed with a plurality of guides, the side close to the central axis of the body of the guide is slidingly installed with wedge-shaped pieces symmetrically distributed above and below, when the wedge-shaped pieces above and below move away from each other, the guide guides the wedge-shaped pieces to move towards the direction close to the central axis of the body, the body is installed with a moving unit for pulling the wedge-shaped pieces to move up and down, the present application sets the wedge-shaped pieces symmetrically distributed above and below in the guide, when the casing moves downward, the wedge-shaped piece on the lower side clamps the casing, when the casing moves upward, the wedge-shaped piece on the upper side clamps the casing, no matter the casing moves upward or downward, it can be automatically locked under the action of pressure, in addition, the inclined groove on the wedge-shaped piece can prevent the casing from rotating, improve the stability and firmness of the casing connection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casing head, in particular to a pressure self-locking casing head with quick connection structure. BACKGROUND

[0002] The casing head is one of the core components of the wellhead device, which is mainly used for fixing the wellhead structure and bearing multiple functions. According to the connection mode with the surface casing, the casing head can be divided into three types of slips, threads and welding. For the slip type casing head, the slip at the lower part of the casing head suspends the surface casing, and the bracket at the bottom and the adjusting screw transmit the wellhead load to the ground. According to the characteristics of the slip itself, when the surface casing falls, the slip will be clamped tighter to avoid the falling of the surface casing.

[0003] After the oil well casing is lowered into the wellbore, it is not completely fixed, but is "anchored" through the cement sheath (the cement sealing layer between the casing and the well wall), and at the same time, it bears multiple pressures inside the wellbore (in the casing) and outside the formation (outside the casing). Under normal circumstances, the gravity of the casing, the gripping force of the cement sheath and the internal and external pressures form a balance, and no displacement occurs; when the pressure changes break this balance, and the upward driving force exceeds the downward restraining force, upward movement may occur, and when the "casing up" or "casing floating" occurs, the slip will move upward and loosen the casing under the push of the casing, affecting the stability and firmness of the casing connection of the casing head. SUMMARY

[0004] In order to solve the above problems, the present application provides a pressure self-locking casing head with quick connection structure, which comprises a body, a plurality of guide members are uniformly distributed in the inside of the body, the guide members are slidingly installed with wedge-shaped members symmetrically distributed above and below on the side close to the central axis of the body, when the wedge-shaped members on the upper and lower sides move away from each other, the guide members guide the wedge-shaped members to move towards the central axis of the body, and a moving unit for pulling the wedge-shaped members to move up and down is installed on the body.

[0005] The moving unit comprises a toothed plate slidingly installed on the guide member in the radial direction of the body, the end of the toothed plate close to the central axis of the body is hingedly connected with connection plates symmetrically distributed above and below, the end of the connection plate away from the toothed plate is hingedly connected with the side of the wedge-shaped member close to the toothed plate, and a hydraulic telescopic rod for pulling the toothed plate to move away from the central axis of the body is fixedly installed on the body.

[0006] A limiting unit for limiting the movement of the toothed plate away from the center of the body is also installed on the body.

[0007] In a possible implementation, the guide is provided with wedge-shaped grooves symmetrically distributed above and below on one side close to the central axis of the body, and the end of the wedge-shaped groove away from the tooth plate is inclined towards the direction close to the central axis of the body, and the wedge-shaped piece is slidingly installed in the corresponding wedge-shaped groove.

[0008] In a possible implementation, the wedge-shaped piece is provided with a plurality of clamping teeth symmetrically distributed above and below on one side close to the central axis of the body and a plurality of inclined grooves uniformly distributed in the circumferential direction, and the included angle between the inclined groove and the clamping tooth is an acute angle.

[0009] In a possible implementation, a C-shaped ring is slidingly installed on the wedge-shaped piece, one end of the C-shaped ring is fixedly connected with an arc-shaped rod, the other end of the C-shaped ring is provided with a slot, and the arc-shaped rod and the slot are inserted and matched.

[0010] In a possible implementation, the tooth plate is fixedly connected with a pull rod at the end away from the central axis of the body, the end of the pull rod away from the central axis of the body is slidingly inserted into the inside of the telescopic section of the hydraulic telescopic rod, and a baffle is fixedly connected to the inside of the telescopic section of the hydraulic telescopic rod after being slidingly inserted into the inside of the telescopic section of the hydraulic telescopic rod, the telescopic section of the hydraulic telescopic rod is provided with a movable groove two, the baffle is slidingly installed in the movable groove two along the radial direction of the body, and the guide is provided with a through hole for the telescopic section of the hydraulic telescopic rod to slidingly penetrate.

[0011] In a possible implementation, the tooth plate is provided with wedge-shaped tooth grooves equidistantly distributed on the left and right sides above and below, the limiting unit comprises clamping blocks slidingly installed in the inside of the guide and symmetrically distributed above and below with respect to the tooth plate, one end of the clamping block close to the tooth plate is wedge-shaped and is inserted and matched with the corresponding tooth groove, the other end of the clamping block away from the tooth plate is fixedly connected with a fixed plate, a return spring is fixedly connected between the other end of the fixed plate away from the tooth plate and the inner wall of the guide, and the body is further provided with an unlocking assembly for driving the clamping block to move away from the tooth plate.

[0012] In a possible implementation, the unlocking assembly comprises a wedge-shaped push block slidingly installed in the inside of the guide along the radial direction of the body, the wedge-shaped push block is located on one side of the fixed plate close to the central axis of the body, the clamping block is provided with a groove for the wedge-shaped push block to pass through, and the other end of the wedge-shaped push block away from the central axis of the body is fixedly connected with a movable rod after extending to one side of the fixed plate away from the central axis of the body, a plurality of outer ring walls of the guide are commonly rotatably installed with a rotating ring, the rotating ring is provided with a plurality of arc-shaped grooves uniformly distributed in the circumferential direction on the upper and lower sides, and the movable rod and the corresponding arc-shaped groove are slidingly matched.

[0013] In a possible implementation mode, the top of the rotating ring is fixedly connected with a large bevel gear, a hand wheel is rotatably installed on the body, a small bevel gear is fixedly connected to the central shaft of the hand wheel and rotatably penetrates the interior of the body, the small bevel gear is engaged with the large bevel gear, and a window is formed in the rotating ring for the telescopic section of the hydraulic telescopic rod to move.

[0014] In a possible implementation mode, a sealing unit for sealing the guide is further installed on the body, the sealing unit comprises a compression ring which is detachably installed in the interior of the body and located above the guide, a sealing gasket one is jointly installed between the bottom of the compression ring and the top of the guide, a sealing gasket two is jointly installed on the bottom of the guide, and a compression cover for compressing the sealing gasket two is installed on the bottom of the body through bolts.

[0015] The present application has the following advantages: 1. By arranging the wedge-shaped pieces symmetrically distributed on the guide, when the body is connected with the top end of the sleeve, the sleeve can drive the lower wedge-shaped piece to move downward when the sleeve moves downward, so that the lower wedge-shaped piece clamps the sleeve, and when the sleeve moves upward, the upper wedge-shaped piece can move upward under the driving of the sleeve, so that the upper wedge-shaped piece clamps the sleeve. Since the upper and lower wedge-shaped pieces are connected through the connecting plate, when the wedge-shaped piece on one side moves away from the tooth plate, the wedge-shaped piece on the other side can move in the opposite direction synchronously. No matter whether the sleeve moves upward or downward, it can be automatically locked under the pressure. In addition, the inclined groove on the wedge-shaped piece can prevent the sleeve from rotating, thereby improving the stability and firmness of the sleeve connection.

[0016] 2. The movement direction of the tooth plate is limited by the limiting unit, so that the tooth plate cannot move away from the central axis of the body. When the tooth plate moves towards the central axis of the body, the limiting unit does not limit the movement of the tooth plate, so that the wedge-shaped piece cannot be loosened, and the wedge-shaped piece can be clamped more tightly, thereby further improving the firmness of the sleeve locking by the wedge-shaped piece. When the sleeve is installed, the tooth plate only needs to be pushed towards the center of the body by the hydraulic telescopic rod, so that the wedge-shaped piece can be quickly clamped to the sleeve, thereby facilitating quick connection and disassembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the present application.

[0018] Figure 2 is a front view of the present application.

[0019] Figure 3 is a perspective view of the wedge-shaped piece of the present application.

[0020] Figure 4 is a perspective view of the C-shaped ring of the present application.

[0021] Figure 5 is a schematic view of the three-dimensional structure of the mobile unit of the present application.

[0022] Figure 6 is a schematic view of the three-dimensional structure of the locking unit of the present application. Figure 5 is an enlarged view of A in the present application.

[0023] Figure 7 is a partial sectional view of the locking unit of the present application.

[0024] Figure 8 is a schematic view of the three-dimensional structure of the clamping block of the present application.

[0025] Figure 9 is a schematic view of the three-dimensional structure of the rotating ring of the present application.

[0026] In the figure: 1, body; 2, guide; 3, wedge; 31, clamping tooth; 32, inclined slot; 33, C-shaped ring; 331, arc-shaped rod; 332, insertion slot; 4, mobile unit; 41, toothed plate; 411, pull rod; 412, blocking piece; 42, connecting plate; 43, hydraulic telescopic rod; 431, movable slot two; 5, limiting unit; 51, clamping block; 52, fixed plate; 53, return spring; 54, unlocking assembly; 541, wedge-shaped push block; 542, movable rod; 543, rotating ring; 544, arc-shaped slot; 545, large bevel gear; 546, hand wheel; 547, small bevel gear; 548, window; 6, sealing unit; 61, compression ring; 62, sealing gasket one; 63, sealing gasket two; 64, gland. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0028] Please refer to Figure 1 - Figure 9 A pressure self-locking casing head with a quick connection structure, comprising a body 1, a plurality of guides 2 are uniformly distributed on the inner periphery of the body 1, wedge-shaped pieces 3 symmetrically distributed on the upper and lower sides are slidingly installed on one side of the guides 2 close to the central axis of the body 1, when the wedge-shaped pieces 3 on the upper and lower sides move away from each other, the guides 2 guide the wedge-shaped pieces 3 to move towards the central axis of the body 1, and a mobile unit 4 for pulling the wedge-shaped pieces 3 to move up and down is installed on the body 1.

[0029] The mobile unit 4 comprises a toothed plate 41 slidingly mounted on the guide 2 along the radial direction of the body 1, the toothed plate 41 is hingedly connected with the upper and lower symmetrically distributed connecting plates 42 near one end of the axis of the body 1, the connecting plates 42 are hingedly connected with the wedge-shaped pieces 3 near the side of the toothed plate 41 away from the toothed plate 41, and the hydraulic telescopic rod 43 is fixedly mounted on the body 1 for pulling the toothed plate 41 to move away from the axis of the body 1.

[0030] The body 1 is further provided with the limiting unit 5 for limiting the movement of the toothed plate 41 away from the center of the body 1.

[0031] In specific use, after the sleeve is inserted between the wedge-shaped pieces 3, the toothed plate 41 is pushed by the hydraulic telescopic rod 43 to move towards the axis of the body 1, the toothed plate 41 pushes the upper and lower connecting plates 42 to open away from each other, the connecting plates 42 push the wedge-shaped pieces 3 to move away from the toothed plate 41, so that the wedge-shaped pieces 3 are clamped on the outside of the sleeve, and the sleeve can be quickly connected and fixed.

[0032] When the toothed plate 41 moves towards the axis of the body 1, the limiting unit 5 does not limit the movement of the toothed plate 41, and when the toothed plate 41 moves away from the axis of the body 1, the movement direction of the toothed plate 41 is limited by the limiting unit 5, so as to avoid the toothed plate 41 moving away from the axis of the body 1, thereby avoiding the wedge-shaped pieces 3 from loosening.

[0033] After the wedge-shaped pieces 3 clamp the sleeve, the sleeve tends to move downward under the action of its own weight, the friction between the sleeve and the lower wedge-shaped pieces 3 drives the lower wedge-shaped pieces 3 to move downward, and the guide 2 guides the lower wedge-shaped pieces 3 to further clamp the sleeve, and in the same way, when the sleeve moves upward, the upper wedge-shaped pieces 3 further clamp the sleeve, so that the wedge-shaped pieces 3 can be clamped more tightly, and since the upper and lower wedge-shaped pieces 3 are connected by the connecting plates 42, when the upper or lower wedge-shaped pieces 3 move away from the toothed plate 41, the wedge-shaped pieces 3 on the other side can move in the opposite direction synchronously, and the sleeve can be automatically locked under pressure no matter whether it moves upward or downward, thereby further improving the firmness of the sleeve connection.

[0034] Please refer to Figure 2 , the side of the guide 2 near the axis of the body 1 is provided with the upper and lower symmetrically distributed wedge-shaped grooves, the end of the wedge-shaped grooves away from the toothed plate 41 is inclined towards the axis of the body 1, and the wedge-shaped pieces 3 are slidingly mounted in the corresponding wedge-shaped grooves.

[0035] In specific use, the wedge-shaped slot is arranged on the guide 2, when the wedge-shaped piece 3 moves away from the tooth plate 41, the wedge-shaped piece 3 is guided to move towards the direction of the central axis of the body 1 by the wedge-shaped slot, so that the wedge-shaped piece 3 gradually clamps the sleeve, and the sleeve is quickly connected and fixed. When the sleeve moves upward or downward, the wedge-shaped slot further guides the wedge-shaped piece 3 to clamp the sleeve, so that the wedge-shaped piece 3 is further self-locked under the action of the pressure, and the fixing effect is improved.

[0036] Please refer to Figure 2 - Figure 4 The side of the wedge-shaped piece 3 close to the central axis of the body 1 is provided with a plurality of clamping teeth 31 distributed equidistantly upward and downward and a plurality of inclined grooves 32 distributed uniformly in the circumferential direction, and the included angle between the inclined groove 32 and the clamping tooth 31 is an acute angle.

[0037] In specific use, the clamping tooth 31 and the inclined groove 32 can improve the friction between the wedge-shaped piece 3 and the sleeve, the outer ring wall of the sleeve is clamped by the clamping tooth 31, so that the sleeve cannot move upward or downward, when the sleeve rotates, the inclined groove 32 can generate resistance to the rotation of the sleeve, so that the sleeve is less likely to rotate, and the inclined groove 32 can guide the sleeve to move upward or downward, so that the wedge-shaped piece 3 can further clamp the sleeve, improve the friction between the wedge-shaped piece 3 and the sleeve, and prevent the sleeve from rotating.

[0038] Please refer to Figure 2 - Figure 4 A C-shaped ring 33 is slidably arranged on the wedge-shaped piece 3, one end of the C-shaped ring 33 is fixedly connected with an arc-shaped rod 331, the other end is provided with a slot 332, and the arc-shaped rod 331 and the slot 332 are inserted and matched.

[0039] In specific use, the C-shaped ring 33 is inserted into the corresponding wedge-shaped piece 3, and then the arc-shaped rod 331 and the slot 332 at the end of the adjacent two C-shaped rings 33 are inserted together, so that a plurality of C-shaped rings 33 form a ring, and the connection between the arc-shaped rod 331 and the slot 332 is arranged in the inside of the wedge-shaped piece 3. The C-shaped ring 33 is used to connect a plurality of wedge-shaped pieces 3, so that a plurality of wedge-shaped pieces 3 move upward or downward synchronously, a plurality of wedge-shaped pieces 3 clamp and fix the sleeve synchronously, and the clamping effect is improved. When the wedge-shaped piece 3 clamps the sleeve, the adjacent wedge-shaped pieces 3 approach each other, at this time, the arc-shaped rod 331 can be further inserted into the slot 332, and the arc-shaped rod 331 is self-adapted to deform, so as to meet the needs of the movement of the wedge-shaped piece 3.

[0040] Please refer to Figure 2 , Figure 5 and Figure 6The one end of the toothed plate 41 away from the axis of the body 1 is fixedly connected with a pull rod 411, the one end of the pull rod 411 away from the axis of the body 1 is slidingly inserted into the inside of the telescopic section of the hydraulic telescopic rod 43 and is fixedly connected with a baffle 412, the telescopic section of the hydraulic telescopic rod 43 is provided with a movable groove two 431, the baffle 412 is slidingly installed in the movable groove two 431 along the radial direction of the body 1, and the guide 2 is provided with a through hole for slidingly penetrating the telescopic section of the hydraulic telescopic rod 43.

[0041] In specific use, the telescopic section of the hydraulic telescopic rod 43 is connected with the toothed plate 41 through the pull rod 411, the toothed plate 41 is driven by the hydraulic telescopic rod 43 to move towards the axis of the body 1 after the sleeve is clamped by the wedge-shaped part 3, and the toothed plate 41 can be further driven by the wedge-shaped part 3 to move towards the axis of the body 1 when the sleeve moves up and down to drive the wedge-shaped part 3 to move, at this time, the baffle 412 moves in the movable groove two 431 towards the axis of the body 1, so that a certain movement amount is reserved between the toothed plate 41 and the telescopic section of the hydraulic telescopic rod 43, and the need of further clamping of the wedge-shaped part 3 is met.

[0042] When the clamping of the sleeve by the wedge-shaped part 3 is to be released, the restriction of the moving unit 4 by the limiting unit 5 is released first, and then the toothed plate 41 is driven by the hydraulic telescopic rod 43 to move away from the axis of the body 1, the wedge-shaped part 3 is pulled by the toothed plate 41 through the connecting plate 42 to slide towards the toothed plate 41, so that the wedge-shaped part 3 releases the clamping of the sleeve, and the body 1 is separated from the sleeve quickly.

[0043] Please refer to Figure 2 , Figure 7 and Figure 8 , the upper and lower sides of the toothed plate 41 are provided with tooth grooves which are equidistantly distributed and wedge-shaped, the depth of the one end of the tooth groove near the axis of the body 1 gradually increases, the limiting unit 5 comprises a clamping block 51 which is slidingly installed in the inside of the guide 2 and is symmetrically distributed about the toothed plate 41, the one end of the clamping block 51 near the toothed plate 41 is wedge-shaped and is in clamping and matching with the corresponding tooth groove, the one end of the clamping block 51 away from the toothed plate 41 is fixedly connected with a fixed plate 52, the one end of the fixed plate 52 away from the toothed plate 41 is fixedly connected with a reset spring 53 between the inner wall of the guide 2, and the body 1 is further provided with an unlocking assembly 54 for driving the clamping block 51 to move away from the toothed plate 41.

[0044] In specific use, the reset spring 53 is in a compressed state, the fixed plate 52 and the clamping block 51 are pushed to move towards the gear plate 41 by the elastic force of the reset spring 53, the clamping block 51 is clamped into the corresponding gear slot, when the gear plate 41 moves towards the central axis of the body 1, the end of the clamping block 51 slides to the end of the gear slot with gradually decreasing depth, the clamping block 51 moves away from the gear plate 41 under the guidance of the gear slot, until the end of the clamping block 51 is separated from the gear slot, and then the end of the clamping block 51 falls into the adjacent gear slot, so that the movement of the gear plate 41 towards the central axis of the body 1 is not limited.

[0045] When the gear plate 41 moves away from the central axis of the body 1, the end of the clamping block 51 slides to the end of the gear slot with smaller depth, the clamping block 51 is blocked at the end of the gear slot with larger depth, so that the gear plate 41 is prevented from moving away from the central axis of the body 1, and the wedge-shaped part 3 is prevented from loosening.

[0046] Please refer to Figure 2 , Figure 7 , Figure 8 , the unlocking assembly 54 comprises a wedge-shaped push block 541 slidingly installed in the guide 2 along the radial direction of the body 1, the wedge-shaped push block 541 is located on the side of the fixed plate 52 close to the central axis of the body 1, the clamping block 51 is provided with a groove for the wedge-shaped push block 541 to pass through, and the end of the wedge-shaped push block 541 away from the central axis of the body 1 is fixedly connected with a movable rod 542 after extending to the side of the fixed plate 52 away from the central axis of the body 1, a rotating ring 543 is jointly and rotatably installed on the outer ring wall of the guide 2, a plurality of arc-shaped grooves 544 are uniformly distributed on the upper and lower sides of the rotating ring 543, and the movable rod 542 is in sliding fit with the corresponding arc-shaped groove 544.

[0047] Please refer to Figure 2 , Figure 7 , Figure 8 and Figure 9 , the top of the rotating ring 543 is fixedly connected with a large bevel gear 545, a hand wheel 546 is rotatably installed on the body 1, the central shaft of the hand wheel 546 is rotatably connected with a small bevel gear 547 after extending through the inside of the body 1, the small bevel gear 547 is in mesh with the large bevel gear 545, and the rotating ring 543 is provided with a window 548 for the movable section of the hydraulic telescopic rod 43 to move.

[0048] Specific use, when the card block 51 to the limit of the tooth plate 41, by rotating hand wheel 546 drive small bevel gear 547 rotation, small bevel gear 547 drive big bevel gear 545 and swivel ring 543 rotation, swivel ring 543 through the arc slot 544 guide movable rod 542 to the axis of the body 1 direction away from the movement, the movable rod 542 pull wedge-shaped push block 541 to the axis of the body 1 direction away from the movement, using wedge-shaped push block 541 to push the fixed plate 52 to the tooth plate 41 direction away from the movement, so that the end of the card block 51 away from the tooth groove, thereby removing the limit of the tooth plate 41, the tooth plate 41 can move away from the axis of the body 1 direction, thereby removing the wedge-shaped piece 3 to the sleeve clamping.

[0049] Please refer to Figure 2 The body 1 is further provided with a sealing unit 6 for sealing the guide 2, the sealing unit 6 comprising a compression ring 61 detachably mounted inside the body 1 and above the guide 2, a plurality of sealing gaskets one 62 being mounted between the bottom of the compression ring 61 and the top of the guide 2, a plurality of sealing gaskets two 63 being mounted on the bottom of the guide 2, and a compression cover 64 being bolted to the bottom of the body 1 for compressing the sealing gaskets two 63.

[0050] In particular, during installation, the compression ring 61 and the sealing gaskets one 62 are sequentially mounted into the body 1, and then the guide 2, the wedge-shaped piece 3, the moving unit 4 and the limiting unit 5 and other components are installed, after which the sealing gaskets two 63 are mounted to the bottom of the guide 2 to seal the lower side of the guide 2, and finally the compression cover 64 is bolted to the bottom of the body 1, and the top and bottom of the guide 2 are respectively sealed by the sealing gaskets one 62 and the sealing gaskets two 63, achieving a double sealing effect, improving the sealing performance during the connection of the sleeve, and avoiding leakage.

[0051] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "provided", "connected", "mounted", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected, or slidingly connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The embodiments of the present application are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A pressure self-locking casing head with a quick connection structure, characterized by: The utility model provides a kind of movable wedge-shaped piece, including body (1), the inside circumference of the body (1) is evenly distributed with several guides (2), the guide (2) is slidably installed with the wedge-shaped piece (3) of symmetric distribution up and down near the side of the axis of body (1), when the wedge-shaped piece (3) of up and down two sides is away from each other, guide (2) guides wedge-shaped piece (3) and moves to the direction close to the axis of body (1), and moving unit (4) for pulling the wedge-shaped piece (3) is installed on the body (1) and moves up and down; The moving unit (4) includes a tooth plate (41) slidably mounted on the guide (2) in the radial direction of the body (1), the tooth plate (41) is hingedly connected with a connecting plate (42) symmetrically distributed up and down at one end near the axis of the body (1), the connecting plate (42) is hingedly connected with the wedge-shaped piece (3) at one end away from the tooth plate (41) on the side close to the tooth plate (41), and a hydraulic telescopic rod (43) for pulling the tooth plate (41) to move away from the axis of the body (1) is fixedly installed on the body (1); The body (1) is further provided with a limiting unit (5) for limiting the movement of the tooth plate (41) away from the center of the body (1); Wherein, the tooth plate (41) is provided with wedge-shaped tooth grooves equidistantly distributed left and right on both sides, the limiting unit (5) includes a clamping block (51) slidably mounted inside the guide (2) and symmetrically distributed up and down with respect to the tooth plate (41), the clamping block (51) is wedge-shaped at one end close to the tooth plate (41) and is clamped with the corresponding tooth groove, the clamping block (51) is fixedly connected with a fixed plate (52) at one end away from the tooth plate (41), a return spring (53) is fixedly connected between the fixed plate (52) and the inner wall of the guide (2) at one end away from the tooth plate (41), and an unlocking assembly (54) is further installed on the body (1) for driving the clamping block (51) to move away from the tooth plate (41); The unlocking assembly (54) includes a wedge-shaped push block (541) slidably mounted inside the guide (2) in the radial direction of the body (1), the wedge-shaped push block (541) is located at one side of the fixed plate (52) close to the axis of the body (1), the clamping block (51) is provided with a groove for the wedge-shaped push block (541) to pass through, and the wedge-shaped push block (541) is fixedly connected with a movable rod (542) at one end away from the axis of the body (1) after extending to one side of the fixed plate (52) away from the axis of the body (1), a rotating ring (543) is rotatably installed on the outer ring wall of the guide (2), a plurality of arc-shaped grooves (544) are evenly distributed on both sides of the rotating ring (543), and the movable rod (542) is slidably connected with the corresponding arc-shaped groove (544). The top of the swivel ring (543) is fixedly connected with a large bevel gear (545), a hand wheel (546) is rotatably installed on the body (1), the central shaft of the hand wheel (546) rotatably penetrates the inside of the body (1) and is fixedly connected with a small bevel gear (547), the small bevel gear (547) is engaged with the large bevel gear (545), and the swivel ring (543) is provided with a window (548) for the hydraulic telescopic rod (43) to move.

2. A pressure self-locking casing head with quick connection structure according to claim 1, characterized in that: The guide (2) is provided with symmetrically distributed wedge-shaped grooves on the side close to the central axis of the body (1), and the end of the wedge-shaped groove away from the toothed plate (41) is inclined towards the central axis of the body (1).

3. A pressure self-locking casing head with quick connection structure according to claim 1, characterized in that: The side of the wedge-shaped part (3) close to the central axis of the body (1) is provided with a plurality of clamping teeth (31) equidistantly distributed upwards and downwards and a plurality of inclined grooves (32) uniformly distributed in the circumferential direction, and the included angle between the inclined groove (32) and the clamping tooth (31) is an acute angle.

4. A pressure self-locking casing head with quick connection structure according to claim 1, characterized in that: The C-shaped ring (33) is slidably installed on the wedge-shaped part (3), one end of the C-shaped ring (33) is fixedly connected with an arc-shaped rod (331), the other end is provided with a slot (332), and the arc-shaped rod (331) is inserted and matched with the slot (332).

5. A pressure self-locking casing head with quick connection structure according to claim 1, characterized in that: The end of the toothed plate (41) away from the central axis of the body (1) is fixedly connected with a pull rod (411), the end of the pull rod (411) away from the central axis of the body (1) is slidably inserted into the inside of the telescopic section of the hydraulic telescopic rod (43) and is fixedly connected with a baffle (412), the telescopic section of the hydraulic telescopic rod (43) is provided with a movable groove two (431), the baffle (412) is slidably installed in the movable groove two (431) along the radial direction of the body (1), and the guide (2) is provided with a through hole for the telescopic section of the hydraulic telescopic rod (43) to slide through.

6. A pressure self-locking casing head with quick connection structure according to claim 1, characterized in that: The body (1) is further provided with a sealing unit (6) for sealing the guide (2), the sealing unit (6) comprises a pressing ring (61) which is detachably installed in the inside of the body (1) and located above the guide (2), a sealing gasket one (62) is jointly installed between the bottom of the pressing ring (61) and the top of the guide (2), a sealing gasket two (63) is jointly installed on the bottom of the guide (2), and the bottom of the body (1) is provided with a pressing cover (64) for pressing the sealing gasket two (63) through bolts.

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