Elastic clamping structure of drill rod

Abstract

The invention provides a drill rod elastic clamping structure, and relates to the technical field of drill rod locking, the drill rod elastic clamping structure comprises a positioning main ring, the outer part of the positioning main ring is integrally provided with six groups of sliding convex blocks which are distributed at equal intervals, and the outer parts of the sliding convex blocks are fixedly provided with positioning seats for installation; six groups of supporting convex blocks which are distributed at equal intervals are integrally arranged outside the bottom supporting ring, and the supporting convex blocks are vertically aligned with the sliding convex blocks; supporting guide rods are fixedly arranged at the tops of the supporting convex blocks, the supporting guide rods are slidably connected with the sliding convex blocks, and top rings are fixedly arranged at the top ends of the supporting guide rods; the main clamping seat is provided with the transverse protruding anti-skid lines to bear the weight of a drill rod and prevent the drill rod from sliding down, the side clamping seats are provided with the vertical protruding anti-skid lines to achieve circumferential anti-rotation braking, the two lines are independently arranged and do not occupy any area, the supporting strength in the vertical direction is guaranteed, circumferential anti-rotation is achieved, bidirectional anti-skid is achieved, and stable clamping is achieved.

Description

Technical Field

[0001] This invention relates to the field of drill pipe locking technology, and in particular to a drill pipe elastic clamping structure. Background Technology

[0002] Drill pipes are heavy and suspended in the well. If the power is released, they are prone to falling and causing accidents. They must be stopped and held in place by a device. When connecting or disconnecting drill pipes, they must also be fixed to prevent them from rotating or sliding down and damaging the threads, and to ensure safety. Elastic clamping is achieved by springs or elastic bodies. It does not damage the drill pipe, can automatically center and reduce shock, and clamps evenly. Essentially, it is a powerful brake with buffer.

[0003] The clamping structure currently in use has the following drawbacks: To ensure a good gripping effect, anti-slip textures are designed. However, one-way textures cannot provide two-way anti-slip effects, and two-way textures reduce the area of ​​one-way textures, which is not conducive to stable gripping. Currently, the main gripping devices used are to position the clamping blocks that are directly driven together by hydraulic pressure and set around the inner side of a ring or cylinder. These devices have poor resistance to deformation. Summary of the Invention

[0004] In view of this, the present invention addresses the shortcomings of the prior art by providing a drill pipe elastic clamping structure.

[0005] This invention provides a drill pipe elastic clamping structure, specifically comprising: a positioning main ring, wherein six sets of equidistantly distributed sliding protrusions are integrally arranged on the outside of the positioning main ring, and positioning seats for installation are fixedly arranged on the outside of each sliding protrusion; a bottom support ring, wherein six sets of equidistantly distributed support protrusions are integrally arranged on the outside of the bottom support ring, the support protrusions being perpendicularly aligned with the sliding protrusions; a support guide rod is fixedly arranged on the top of each support protrusion, the support guide rod being slidably connected to the sliding protrusion, and a top ring is fixedly arranged on the top of the support guide rod; a movable support ring is also slidably arranged above the outside of the support guide rod, and six sets of guide platforms are integrally arranged in the movable support ring; and a main clamping seat, wherein there are six sets of main clamping seats, the main clamping seats are located inside the movable support ring and aligned with the guide platforms, and hinged cranks are integrally arranged at both ends on the side of the main clamping seat near the guide platforms, and U-shaped slides are fixedly arranged on the outside of each hinged crank, the U-shaped slides being slidably connected to the movable support ring.

[0006] Optionally, the top of the positioning main ring is integrally provided with six sets of lower hinge seats, which are distributed in a equidistant ring. Each lower hinge seat is aligned with a set of sliding protrusions, and lower connecting rods are hinged to both sides of the lower hinge seats.

[0007] Optionally, the lower connecting rods are all aligned below a set of main clamping seats, and the other end of each lower connecting rod is hinged to the middle of the hinged cranks on both sides of the main clamping seats.

[0008] Optionally, the bottom support ring has an internal oil passage, and a solenoid valve is fixedly connected to one side of the bottom support ring; six sets of hydraulic cylinders are fixedly installed on the top of the bottom support ring, the positions of the hydraulic cylinders are staggered with the support protrusions, and the bottom of the hydraulic cylinders passes through the internal oil passage of the bottom support ring and communicates with the solenoid valve; the top of the hydraulic cylinders is fixedly installed at the bottom of the positioning main ring; a hydraulic pump is externally connected to the solenoid valve, and hydraulic oil can be input or output after the solenoid valve is opened to control the lifting and lowering of the hydraulic cylinders.

[0009] Optionally, the inner side of the top ring is integrally provided with six sets of inner hinge seats, which are distributed in a equidistant ring. Each set of inner hinge seats is hinged with an upper connecting rod, and the other end of the upper connecting rod is coaxially hinged to the upper end of the lower connecting rod.

[0010] Optionally, the main clamping seat has an integrally formed transverse raised anti-slip texture on the side near the center of the movable support ring. The transverse raised anti-slip texture provides vertical friction, increases vertical support, and prevents the drill rod from slipping. The specific texture of the raised anti-slip texture can be adjusted as needed, and the raised anti-slip texture itself can even be made separately from a high-strength material. Side clamping seats are hinged on both sides of the main clamping seat. The side clamping seats have an integrally formed vertical raised anti-slip texture on the side near the center of the movable support ring. The vertical raised anti-slip texture provides circumferential anti-slip effect and prevents the drill rod from rotating again. Since it does not need to bear the weight of the drill rod, it can be used as a movable elastic clamping structure.

[0011] Optionally, the side clamping seat is integrally provided with a limiting structure on the side near the main clamping seat, and the limiting structure limits the maximum angle between the side clamping seat and the main clamping seat to 30 degrees.

[0012] Optionally, multiple sets of springs are hinged between the farthest edges of the hinged crank and the side clamping seat. Each spring set consists of a central spring and hinge seats on both sides, and is fixed by welding.

[0013] The beneficial effects are as follows: This invention features a main clamping seat with transversely protruding anti-slip grooves to support the weight of the drill rod and prevent slippage, and a side clamping seat with vertically protruding anti-slip grooves to achieve circumferential anti-rotation braking. The two types of grooves are arranged independently and do not occupy each other's area, which ensures both vertical support strength and circumferential anti-rotation. This solves the problems of poor unidirectional anti-slip effect and mutual weakening of clamping stability by traditional unidirectional grooves, and achieves bidirectional anti-slip and stable clamping.

[0014] The rigid outer frame is composed of a positioning main ring, a bottom support ring, a top ring, and six sets of support guide rods. In conjunction with the hydraulic cylinder driving the upper and lower linkage mechanism, the six sets of main clamping seats synchronously retract and open radially. The force is uniform and the automatic centering is achieved. The overall deformation resistance is far superior to the traditional direct hydraulic drive clamping block structure. It is not easily deformed under heavy drill pipe clamping conditions and has higher reliability.

[0015] The side clamping seat provides elastic support through a spring assembly and is limited by a limiting structure to a maximum opening angle of 30°. It can adaptively conform to the outer wall of the drill pipe to achieve elastic buffering and shock absorption, avoiding damage to the drill pipe surface by rigid clamping. At the same time, the side clamping seat makes priority contact with the drill pipe, which can brake in advance when the drill pipe is rotating inertia, and then the main clamping seat completes the final clamping, which greatly improves the stability and safety of the clamping process. Attached Figure Description

[0016] Figure 1 A schematic diagram of the clamping state structure in an embodiment of the present invention is shown; Figure 2 An embodiment of the present invention is shown. Figure 1 A schematic diagram of the structure viewed from the side; Figure 3 An embodiment of the present invention is shown. Figure 1 A schematic diagram of the side view structure; Figure 4 A schematic diagram of the released state structure of an embodiment of the present invention is shown; Figure 5 An embodiment of the present invention is shown. Figure 4 A schematic diagram of the side view structure; Figure 6 A schematic diagram of the peripheral structure of an embodiment of the present invention is shown; Figure 7 A three-dimensional structural schematic diagram of the main clamping seat in an embodiment of the present invention is shown; Figure 8 A three-dimensional cross-sectional view of the side clamping seat in an embodiment of the present invention is shown.

[0017] List of reference numerals in the attached diagram: 1. Main ring; 101. Sliding protrusion; 102. Positioning seat; 103. Lower hinge seat; 104. Lower connecting rod; 2. Bottom support ring; 201. Support protrusion; 202. Solenoid valve; 203. Hydraulic cylinder; 3. Support guide rod; 4. Top ring; 401. Inner hinge seat; 402. Upper connecting rod; 5. Movable support ring; 501. Guide platform; 6. Main clamping seat; 601. Hinge crank; 602. Side clamping seat; 603. Spring assembly; 7. U-shaped slide. Detailed Implementation

[0018] To make the objectives, solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention.

[0019] Example 1: Please refer to the accompanying drawings in the instruction manual. Figures 1 to 8 As shown: This invention proposes an elastic clamping structure for drill pipes, comprising: a positioning main ring 1, on the outside of which six sets of equidistantly distributed sliding protrusions 101 are integrally arranged, and each sliding protrusion 101 is fixedly provided with a positioning seat 102 for installation; a bottom support ring 2, on the outside of which six sets of equidistantly distributed support protrusions 201 are integrally arranged, and the support protrusions 201 are perpendicularly aligned with the sliding protrusions 101; and a support guide rod 3 is fixedly provided on the top of each support protrusion 201, and the support guide rod 3 is slidably connected to the sliding protrusion 101. Next, a top ring 4 is fixedly installed at the top of the support guide rod 3; a movable support ring 5 is also slidably installed at the upper outer position of the support guide rod 3, and six sets of guide platforms 501 are integrally installed in the movable support ring 5; there are six sets of main clamping seats 6, which are located inside the movable support ring 5 and aligned with the guide platforms 501. The two ends of the main clamping seats 6 near the guide platforms 501 are integrally installed with hinged cranks 601, and U-shaped slides 7 are fixedly installed outside the hinged cranks 601. The U-shaped slides 7 are slidably connected to the movable support ring 5.

[0020] The top of the positioning main ring 1 is integrally provided with six sets of lower hinge seats 103. The six sets of lower hinge seats 103 are distributed in a equidistant ring. Each lower hinge seat 103 is aligned with a set of sliding protrusions 101. Lower connecting rods 104 are hinged on both sides of the lower hinge seat 103.

[0021] The lower connecting rods 104 are all aligned below a set of main clamping seats 6, and the other end of the lower connecting rods 104 is hinged to the middle of the hinged cranks 601 on both sides of the main clamping seats 6.

[0022] The bottom support ring 2 has an internal oil passage, and a solenoid valve 202 is fixedly connected to one side of the bottom support ring 2. Six sets of hydraulic cylinders 203 are fixedly installed on the top of the bottom support ring 2. The positions of the hydraulic cylinders 203 are staggered with the support protrusions 201. The bottom of the hydraulic cylinders 203 passes through the internal oil passage of the bottom support ring 2 and communicates with the solenoid valve 202. The top of the hydraulic cylinders 203 is fixedly installed at the bottom of the positioning main ring 1. The solenoid valve 202 is externally connected to a hydraulic pump. After the solenoid valve 202 is opened, hydraulic oil can be input or output to control the lifting and lowering of the hydraulic cylinders 203.

[0023] The top ring 4 has six sets of inner hinge seats 401 integrally arranged on its inner side. The six sets of inner hinge seats 401 are distributed in a equidistant ring. Each inner hinge seat 401 is hinged with an upper connecting rod 402. The other end of the upper connecting rod 402 is coaxially hinged with the upper end of the lower connecting rod 104.

[0024] The main clamping seat 6 has an integrally formed transverse raised anti-slip texture on the side near the center of the movable support ring 5. The transverse raised anti-slip texture provides vertical friction, increases vertical support, and prevents the drill rod from slipping. The specific texture of the raised anti-slip texture can be adjusted as needed, and the raised anti-slip texture itself can even be made separately from a high-strength material. The main clamping seat 6 has a hinged side clamping seat 602 on both sides. The side clamping seat 602 has an integrally formed vertical raised anti-slip texture on the side near the center of the movable support ring 5. The vertical raised anti-slip texture provides circumferential anti-slip effect and prevents the drill rod from rotating again. Since it does not need to bear the weight of the drill rod, it can be used as a movable elastic clamping structure.

[0025] Among them, the side clamping seat 602 is integrally provided with a limiting structure on the side closest to the main clamping seat 6, and the limiting structure limits the maximum angle between the side clamping seat 602 and the main clamping seat 6 to 30 degrees.

[0026] Among them, a spring group 603 arranged in multiple groups is hinged between the farthest edge of the hinged crank 601 and the side clamping seat 602. The spring group 603 consists of a middle spring and hinge seats on both sides, and is fixed by welding.

[0027] The solenoid valve 202 is connected to an external hydraulic oil pump or hydraulic control system. After it is opened, the hydraulic oil enters the bottom support ring 2 through the solenoid valve 202 and is delivered to each set of hydraulic cylinders 203, causing the hydraulic cylinders 203 to extend and push the positioning main ring 1 upward, thereby increasing the distance between the positioning main ring 1 and the bottom support ring 2.

[0028] The lower connecting rod 104 and the upper connecting rod 402 form a slider mechanism, which drives the six main clamping seats 6 to retract towards the center and fit against the drill rod to achieve clamping and fixation.

[0029] When the side clamp 602 contacts the drill pipe, it opens outward, and the spring assembly 603 provides adaptive elasticity, so that it fits tightly against the outer wall of the drill pipe and plays a circumferential anti-slip role.

[0030] Typically, the side clamping seat 602 contacts the drill pipe first, which can brake it in advance while the drill pipe is still rotating due to inertia, and then the main clamping seat 6 completes the final clamping and support.

[0031] Example 2: Based on Example 1, the positioning seat 102 serves as a support structure and is fixed inside the drilling wellhead frame. Its shape can be customized according to special requirements. It only serves a fixing function and can be fixed to the outside of the sliding protrusion 101 by bolt connection or direct welding.

[0032] If the wellhead is low, the bottom support ring 2 can be used as the lowest support position, and the positioning seat 102 can be installed on the outside of the support protrusion 201. The support protrusion 201 and the sliding protrusion 101 are the same size, which makes it easy to switch between them.

[0033] Example 3: Based on Example 1, the texture direction of the side clamping seat 602 can also be changed, or the texture can be eliminated, and a rubber block can be used to directly achieve the clamping effect through friction.

[0034] The specific usage and function of this embodiment: In this invention, when in use, the positioning seat 102 is used as a support structure to be fixed in the frame at the wellhead of the well. If there is a special need, the shape of the positioning seat 102 can be customized into other shapes. The function of the positioning seat 102 is only to fix. The positioning seat 102 can be fixed to the outside of the sliding protrusion 101 by bolt connection or direct welding. If the wellhead is low, the bottom support ring 2 can be used as the lowest position. The positioning seat 102 can be installed on the outside of the support protrusion 201. The support protrusion 201 and the sliding protrusion 101 are made to the same size for easy switching. The external connection of the solenoid valve 202 is a hydraulic oil pump or a pressure system that can control hydraulic pressure. After the solenoid valve 202 is opened, the hydraulic oil passes through the solenoid valve 202 and is input into the interior of the bottom support ring 2, and into each set of hydraulic cylinders 203. The hydraulic cylinders 203 are opened, and the hydraulic cylinders 203 are used to push the positioning main ring 1 upward, so that the distance between the positioning main ring 1 and the bottom support ring 2 increases. The lower connecting rod 104 and the upper connecting rod 402 constitute a slider mechanism. During this process, the main clamping seats 6 are brought together towards the center, and the drill rod is clamped and fixed by the six sets of main clamping seats 6 against it. (See process reference...) Figures 4 to 1 Changes; When the side clamp 602 contacts the drill pipe, it opens outward. The spring assembly 603 provides adaptive elasticity to make the side clamp 602 fit against the outer wall of the drill pipe. The side clamp 602 provides a circumferential anti-slip effect. Generally, the side clamp 602 contacts the drill pipe first, and then the main clamp 6 contacts the drill pipe. Before the drill pipe is clamped, it is still in an inertial rotation state. The side clamp 602 can stop the drill pipe in advance, and then the main clamp 6 can fix and support it. By reversing the aforementioned steps, the clamping restriction can be removed.

Claims

1. A drill pipe elastic clamping structure, characterized in that, include: The positioning main ring (1) is integrally provided with six sets of equidistant sliding protrusions (101) on its exterior. Each sliding protrusion (101) is fixedly provided with a positioning seat (102) for installation. The bottom support ring (2) is integrally provided with six sets of equidistant support protrusions (201) on its exterior. The support protrusions (201) are vertically aligned with the sliding protrusions (101). Each support protrusion (201) is fixedly provided with a support guide rod (3) on its top. The support guide rod (3) is slidably connected to the sliding protrusion (101). The top of the support guide rod (3) is fixedly provided with a support guide rod (3). A top ring (4) is fixedly provided; a movable support ring (5) is also slidably provided above the outer side of the support guide rod (3), and six sets of guide platforms (501) are integrally provided in the movable support ring (5); a main clamping seat (6) is provided, the number of the main clamping seats (6) is six sets, the main clamping seat (6) is located inside the movable support ring (5) and aligned with the guide platform (501), and a hinged crank (601) is integrally provided at both ends of the side of the main clamping seat (6) near the guide platform (501), and a U-shaped slide (7) is fixedly provided outside the hinged crank (601), and the U-shaped slide (7) is slidably connected to the movable support ring (5).

2. The drill pipe elastic clamping structure as described in claim 1, characterized in that, The top of the positioning main ring (1) is integrally provided with six sets of lower hinge seats (103). The six sets of lower hinge seats (103) are distributed in a equidistant ring. Each lower hinge seat (103) is aligned with a set of sliding protrusions (101). Lower connecting rods (104) are hinged on both sides of the lower hinge seat (103).

3. The drill pipe elastic clamping structure as described in claim 2, characterized in that, The lower connecting rods (104) are all aligned below a set of main clamping seats (6), and the other end of the lower connecting rods (104) is hinged to the middle of the hinged cranks (601) on both sides of the main clamping seats (6).

4. The drill pipe elastic clamping structure as described in claim 1, characterized in that, The bottom support ring (2) has an oil passage inside, and a solenoid valve (202) is fixedly connected to one side of the bottom support ring (2); six sets of hydraulic cylinders (203) are fixedly installed on the top of the bottom support ring (2), the position of the hydraulic cylinders (203) is staggered with the support protrusion (201), and the bottom of the hydraulic cylinders (203) passes through the internal oil passage of the bottom support ring (2) and communicates with the solenoid valve (202); the top of the hydraulic cylinders (203) is fixedly installed at the bottom of the positioning main ring (1).

5. The drill pipe elastic clamping structure as described in claim 3, characterized in that, The top ring (4) is integrally provided with six sets of inner hinge seats (401). The six sets of inner hinge seats (401) are distributed in a equidistant ring. Each inner hinge seat (401) is hinged with an upper connecting rod (402). The other end of the upper connecting rod (402) is coaxially hinged with the upper end of the lower connecting rod (104).

6. The drill pipe elastic clamping structure as described in claim 1, characterized in that, The main clamping seat (6) has a horizontally protruding anti-slip texture integrally provided on the side near the center of the movable support ring (5); the main clamping seat (6) has a side clamping seat (602) hinged on both sides, and the side clamping seat (602) has a vertically protruding anti-slip texture integrally provided on the side near the center of the movable support ring (5).

7. The drill pipe elastic clamping structure as described in claim 6, characterized in that, The side clamping seat (602) is integrally provided with a limiting structure on the side near the main clamping seat (6), and the limiting structure limits the maximum angle between the side clamping seat (602) and the main clamping seat (6) to 30 degrees.

8. The drill pipe elastic clamping structure as described in claim 7, characterized in that, The articulated crank (601) and the side clamping seat (602) are hinged together by a spring group (603) arranged in multiple groups. The spring group (603) consists of a middle spring and hinge seats on both sides, and is fixed by welding.

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