Chuck clamping assembly for oil casing

Abstract

The chuck clamping assembly comprises a chuck ring seat and a chuck core, the inner side wall of the chuck ring seat is provided with an inclined face which gradually inclines inwards from top to bottom, and the outer side wall of the chuck core is provided with a matching face which gradually inclines inwards from top to bottom. The matching surface slides on the inclined surface, so that the chuck core loosens an oil pipe when moving upwards relative to the chuck ring seat and grasps the oil pipe when moving downwards relative to the chuck ring seat, and the limiting ring is located above the chuck ring seat and provided with a through hole extending in the radial direction; the chuck core is movably connected with the limiting ring through a movable rod arranged in the through hole in a penetrating mode. The device is small in occupied space, free of extra power, convenient for subsequent manual operation rotation, long in service life and simple and reasonable in structure.

Description

Technical Field

[0001] This application relates to a chuck clamping assembly for oil casing pipes. Background Art

[0002] In the fields of oil and drilling, chucks are often used to grasp and suspend the tubing being pulled out or lowered. Generally, the inner circumferential surface of the chuck ring seat in the chuck and the outer circumferential surface of the chuck core are both inverted conical surfaces and fit together. After the tubing is inserted into the ring sleeve of the chuck, under the action of gravity, the tubing naturally falls. At this time, the inner circumferential surface of the chuck ring seat presses the chuck core tightly against the tubing, causing multiple tile cores to lock the tubing, thereby preventing the tubing from continuing to fall.

[0003] However, the chuck products on the market currently have problems such as overly complex structures, large space occupation, inconvenience for workers to perform subsequent operations of rotating the tubing, and short service lives. For example, the Chinese utility model patent with the authorization announcement number CN215949418U and the title of Oil Production Tree Tubing Hanging Structure and Wellhead Device discloses: an oil production tree tubing hanging structure, including: an oil production tree main pipe, with an inner ring groove provided on the inner wall; a fixed ring seat, arranged in the inner ring groove, and the inner circumferential surface is an inverted conical surface; a chuck, arranged in the fixed ring seat and used to hold the tubing tightly, and the outer circumferential surface is an inverted conical surface and is matched with the inner circumferential surface of the fixed ring seat; a locking ring, abutted against one end of the chuck away from the fixed ring seat; and an elastic pulling unit, arranged between the locking ring and the oil production tree main pipe, and adapted to pull the locking ring to push the chuck into the fixed ring seat. In the solution of this utility model, the locking ring still needs to cooperate with the oil production tree main pipe through the elastic pulling unit, and the elastic pulling unit is arranged outside the fixed ring seat, resulting in large space occupation of the product and inability to realize the operation of workers rotating the tubing, which is very inconvenient in actual use scenarios.

[0004] For another example, the Chinese utility model patent with the authorization announcement number CN210483576U and entitled a chuck device discloses: comprising: a chuck shell, a channel is arranged inside the chuck shell, the channel extends along the axial direction of the chuck shell, the inner diameter of the channel gradually decreases from the upper end to the lower end of the chuck shell, the side end of the upper part of the chuck shell extends in the direction away from the axis of the chuck shell and forms a chuck arm; a chuck core, the chuck core comprises a first claw, a second claw and a third claw, the second claw and the third claw are respectively hinged at the two side ends of the first claw, the first claw, The inner walls of the second and third claws are matched with the outer walls of the oil pipe, and the outer walls of the first, second and third claws are matched with the inner walls of the channel; a connecting rod, the first end of the connecting rod is hinged with the upper end of the first claw, the second end of the connecting rod is hinged with the end of the chuck crank arm away from the axis of the chuck housing, the middle part of the connecting rod is hinged with the free end of the piston rod of the driving device through a pin, and one end of the pin extends out of the connecting rod; a hook, the first end of the hook is hinged with the chuck crank arm, and the second end of the hook forms a hook body, and the hook body is used to connect with the end of the connecting rod extending out of the pin. The technical solution described in this utility model has a complex structure and a short service life. It is necessary to frequently maintain the connecting rod components to ensure that the driving device can normally drop the claws. In addition, this solution cannot provide convenient conditions for rotating the oil pipe. Utility Model Content

[0005] The present application provides a chuck clamping assembly for oil casing, which has the technical advantages of small space occupation, no need to provide additional power, easy subsequent manual operation and rotation, long service life, and simple and reasonable structure.

[0006] This application mainly adopts the following technical solutions:

[0007] A chuck clamping assembly for an oil casing comprises a chuck ring seat and a chuck core, wherein the inner side wall of the chuck ring seat is provided with an inclined surface which is gradually inclined inward from top to bottom, and the outer side wall of the chuck core is provided with a mating surface which is gradually inclined inward from top to bottom, and the mating surface slides on the inclined surface so that the chuck core releases the oil pipe when it moves upward relative to the chuck ring seat and grasps the oil pipe when it moves downward, and also comprises a limit ring, wherein the limit ring is located above the chuck ring seat, the limit ring is provided with a through hole extending in a radial direction, and the chuck core is movably connected to the limit ring via a movable rod penetrated through the through hole.

[0008] Wherein, a radial limiting structure is provided between the inclined surface and the matching surface to prevent the matching surface from being radially separated from the inclined surface without axially moving up and down.

[0009] Wherein, the chuck ring seat adopts at least two arc-shaped structures connected by a pin shaft.

[0010] Among them, the limiting ring adopts at least two fan-shaped structures and is engaged with each other through a mutually matching clamping groove and a clamping projection.

[0011] Among them, the limiting ring is also provided with a limiting hole. The chuck ring seat is movably connected with the limiting ring through a limiting rod passing through the limiting hole. A reset member is arranged on the limiting rod. One end of the reset member abuts against the upper end surface of the chuck ring seat, and the other end of the reset member abuts against the lower end surface of the limiting ring. When the movable rod moves downward and inward relative to the chuck ring seat driven by the chuck core, the reset member provides a restoring force away from the chuck ring seat for the limiting ring driven by the movable rod to move downward.

[0012] Among them, it further includes a chuck base. The chuck base is movably connected with the chuck ring seat, and the chuck ring seat rotates circumferentially relative to the chuck base.

[0013] Among them, the chuck ring seat rotates circumferentially relative to the chuck base through rolling members arranged on the chuck base.

[0014] Among them, an installation groove is arranged on the chuck base. The rolling members are arranged in the installation groove through installation beams passing through the installation groove. A rolling limiting wall is arranged on the lower end surface of the chuck ring seat. The rolling members roll inside the rolling limiting wall so that the chuck ring seat rotates circumferentially relative to the chuck base.

[0015] Among them, the outer diameter of the chuck base is larger than the outer diameter of the chuck ring seat. A rolling bearing is further arranged on the upper end surface of the outer peripheral edge of the chuck base, and the rolling bearing rolls along the outer peripheral surface of the chuck ring seat.

[0016] A chuck clamping assembly for an oil casing according to the present application has the following technical effects:

[0017] (1) The chuck clamping assembly of the present application can be opened and clamped only through the mechanical structure design of the chuck ring seat and the chuck core, without the need to provide additional power. The structure is simple and compact, and the product occupies a small space.

[0018] (2) The chuck ring seat adopts at least two arc-shaped structures and is joined through a pin shaft. The limiting ring adopts at least two fan-shaped structures and is engaged with each other through a mutually matching clamping groove and a clamping projection, so that the opening action can be conveniently carried out.

[0019] (3) In this application, the chuck base is movably connected to the chuck ring base, and the chuck ring base rotates circumferentially relative to the chuck base. This structural design is beneficial for rotating the lifted oil pipe, improving the on-site operation efficiency. Moreover, the abrasive blocks can be easily replaced, and the structure is simpler, more stable, more durable, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic diagram of the chuck structure.

[0021] Figure 2 is Figure 1 a schematic diagram of the bottom structure of the chuck shown in FIG..

[0022] Figure 3 FIG. is a schematic diagram of the chuck structure after disassembling part of the structure.

[0023] Figure 4 is Figure 3 a schematic diagram of the bottom structure in FIG..

[0024] 1 chuck, 10 lifting ring, 11 chuck ring base, 110 annular rolling groove, 111 arc-shaped structure, 12 chuck core, 121 tile core, A inclined surface, B mating surface, C radial limiting structure, 2 pin shaft, 13 limiting ring, 130 through hole, 1300 limiting hole, 131 fan-shaped structure, 3 movable rod, 4 limiting rod, 5 resetting member, 14 chuck base, 140 mounting groove, 6 rolling member, 7 mounting beam, 8 rolling bearing, S core seat, 9 connecting shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further elaborates on the technical solutions of this application in conjunction with the accompanying drawings:

[0026] See Figures 1 to 4As shown in the figure, a chuck clamping component for oil casing according to the present application includes a chuck ring base 11 and a chuck core 12. The inner side wall of the chuck ring base 11 is provided with an inclined surface A that gradually inclines inward from top to bottom. The outer side wall of the chuck core 12 is provided with a mating surface B that gradually inclines inward from top to bottom. The mating surface B slides on the inclined surface A so that the chuck core 12 releases the oil pipe when moving upward relative to the chuck ring base 11 and grips the oil pipe when moving downward. It further includes a limit ring 13. The limit ring 13 is located above the chuck ring base 11. The limit ring 13 is provided with a through hole 130. The chuck core 12 is movably connected to the limit ring 13 through a movable rod 3 passing through the through hole 130. Preferably, the inner side wall of the chuck ring base 11 is provided with a core seat S. The inclined surface A is formed on the core seat S. The core seat S is fixedly connected to the chuck ring base 11 through a connecting shaft 9 inserted into the chuck ring base 11. Preferably, the chuck core 12 includes a plurality of tile cores 121 evenly distributed circumferentially along the inner side wall of the chuck ring base 11. To increase the friction between the tile cores 121 and the outer wall of the oil pipe, abrasive blocks are provided in the middle of the tile cores 121. In the process of long-term use, if the abrasive blocks are severely worn, the abrasive blocks can be replaced. The abrasive blocks are provided with trapezoidal clamping parts, and the trapezoidal clamping parts are clamped into the trapezoidal grooves of the tile cores 121. More preferably, the trapezoidal clamping parts and the trapezoidal grooves are mutually matched by means of horizontal insertion and are perpendicular to the axial direction of the oil pipe, so as to prevent the abrasive blocks from falling off with the movement of the oil pipe. Preferably, the top end of the movable rod 3 is provided with a convex block to prevent the movable rod 3 from disengaging from the through hole 130.

[0027] See Figures 1 to 4 As shown in the figure, a radial limit structure C is provided between the inclined surface A and the mating surface B to prevent the mating surface B from radially separating from the inclined surface A without axial up and down movement. In the present application, the radial limit structure C prevents the situation where the inclined surface A and the mating surface B directly radially separate without axial movement. Preferably, the radial limit structure C is a trapezoidal groove and a trapezoidal protrusion formed between the inclined surface A and the mating surface B, so as to prevent the chuck core 12 from radially disengaging from the chuck ring base 11.

[0028] See Figure 3 、 4 As shown in the figure, the chuck ring base 11 is formed by joining at least two arc-shaped structures 111 through a pin shaft 2. With this structural design, after pulling out the pin shaft 2, at least two arc-shaped structures 111 can be opened, and the oil pipe can be loaded into the center of the chuck ring base 11, which is more convenient for manual operation, and the structure is reasonable and convenient.

[0029] See Figure 3 、 4As shown, the limiting ring 13 adopts at least two fan-shaped structures 131 which are engaged with each other through a matching clamping groove and clamping projection. In this application, by adopting at least two fan-shaped structures to be engaged with each other, the opening action can be synchronized with the arc-shaped structure of the chuck ring seat, so as to install the oil pipe into the center of the limiting ring.

[0030] See Figure 3 As shown, the limiting ring 13 is also provided with a limiting hole 1300, and the chuck ring seat 11 is movably connected to the limiting ring 13 through a limiting rod 4 passing through the limiting hole 1300. A reset member 5 is arranged on the limiting rod 4. One end of the reset member 5 abuts against the upper end surface of the chuck ring seat 11, and the other end of the reset member 5 abuts against the lower end surface of the limiting ring 13. When the movable rod 3 moves downward and inward relative to the chuck ring seat 11 driven by the chuck core 12, the reset member 5 provides a reset force for the limiting ring 13 driven by the movable rod 3 to move downward and away from the chuck ring seat 11. Preferably, a convex block is provided at the top end of the limiting rod 4 to prevent the limiting rod 4 from disengaging from the limiting hole 1300. More preferably, the limiting rod 4 is a screw fixed to the upper end surface of the chuck ring seat 11. Preferably, the reset member 5 is sleeved on the limiting rod 4, and the reset member 5 is a spring. Preferably, the length of the movable rod 3 is greater than the length of the limiting rod 4.

[0031] See Figures 1 to 4 As shown, it further includes a chuck base 14. The chuck base 14 is movably connected to the chuck ring seat 11, and the chuck ring seat 11 rotates circumferentially relative to the chuck base 14. This structural design is beneficial to the rotation operation of the lifted oil pipe, improves the on-site operation efficiency, and has a simpler, more stable and durable structure. Preferably, in this application, the chuck base 14 and the chuck ring seat 11 are inseparable in the axial direction, so as to ensure the stability of the whole chuck structure. Preferably, the chuck base 14 is also formed as a whole by joining at least two components, so as to facilitate the installation of the oil pipe into its center.

[0032] See Figure 3 、 4 As shown, the chuck ring seat 11 rotates circumferentially relative to the chuck base 14 through a rolling member 6 arranged on the chuck base 14. Preferably, the rolling member is a roller.

[0033] See Figure 3 、 4As shown, an installation groove 140 is provided on the chuck base 14, and the rolling member 6 is disposed in the installation groove 140 through an installation beam 7 inserted in the installation groove 140. A rolling limit wall 110 is provided on the lower end surface of the chuck ring base 11, and the rolling member 6 rolls inside the rolling limit wall 110 to enable the chuck ring base 11 to rotate circumferentially relative to the chuck base 14. Preferably, a limit channel extending to the installation beam 7 is further formed on the chuck base 14, and a limit pin is inserted into the limit channel and connected to the installation beam 7, so as to ensure that the rolling member 6 rotating around the installation beam 7 can have a stable support.

[0034] See Figures 1 to 4 As shown, the outer diameter of the chuck base 14 is larger than the outer diameter of the chuck ring base 11, and a rolling bearing 8 is further provided on the upper end surface of the outer peripheral edge of the chuck base 14, and the rolling bearing 8 rolls along the outer peripheral surface of the chuck ring base 11. With this structural design, it can be further ensured that the circumferential rotation between the chuck ring base 11 and the chuck base 14 is smoother. Preferably, the lifting ring 10 is provided on the outer peripheral surface of the chuck base 14.

[0035] Although the specific embodiments of the present application have been described above, those of ordinary skill in the art can make changes thereto without departing from the spirit and principle of the present application. The protection scope of the present application is defined by its claims and their equivalents.

Claims

1. A chuck clamping assembly for oil casing pipes, comprising a chuck ring seat and a chuck core. An inclined surface is provided on the inner side wall of the chuck ring seat, and a mating surface is provided on the outer side wall of the chuck core. The mating surface can slide on the inclined surface. When the chuck core moves upward relative to the chuck ring seat, the oil pipe is released, and when the chuck core moves downward relative to the chuck ring seat, the oil pipe is clamped. It is characterized in that: It further includes a limit ring which is located above the chuck ring seat. The limit ring is provided with a through hole, and the chuck core is movably connected to the limit ring through a movable rod passing through the through hole.

2. The chuck clamping assembly for oil casing according to claim 1, wherein: A radial limit structure is provided between the inclined surface and the mating surface, and the radial limit structure can prevent the mating surface from radially separating from the inclined surface without axially moving up and down.

3. The chuck clamping assembly for oil casing according to claim 1, characterized in that: The chuck ring seat includes at least two arc-shaped structures joined together by a pin shaft.

4. The chuck clamping assembly for oil casing according to claim 1, wherein: The limit ring includes at least two fan-shaped structures that are opposed by a mutually cooperating clamping groove and a clamping projection.

5. The chuck clamping assembly for oil casing according to any one of claims 1 to 4, characterized in that: The limit ring is further provided with a limit hole. The chuck ring seat is movably connected to the limit ring through a limit rod passing through the limit hole. A reset member is provided on the limit rod, one end of the reset member abuts against the upper end surface of the chuck ring seat, and the other end of the reset member abuts against the lower end surface of the limit ring.

6. The chuck clamping assembly for oil casing according to claim 5, wherein: It further includes a chuck base, the chuck base is movably connected to the chuck ring seat, and the chuck ring seat rotates circumferentially relative to the chuck base.

7. The chuck clamping assembly for oil casing according to claim 6, characterized in that: The chuck ring seat rotates circumferentially relative to the chuck base through rolling members provided on the chuck base.

8. The chuck clamping assembly for oil casing according to claim 7, wherein: An installation groove is provided on the chuck base. The rolling members are arranged in the installation groove through installation beams passing through the installation groove. A rolling limit wall is provided on the lower end surface of the chuck ring seat, and the rolling members roll inside the rolling limit wall to enable the chuck ring seat to rotate circumferentially relative to the chuck base.

9. The chuck clamping assembly for oil casing according to any one of claims 6 to 8, characterized in that: The outer diameter of the chuck base is larger than the outer diameter of the chuck ring seat. A rolling bearing is further provided on the upper end surface of the outer peripheral edge of the chuck base, and the rolling bearing rolls along the outer peripheral surface of the chuck ring seat.

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