Automatic drill rod centering and clamping device for large-torque drilling machine
By setting piston pressure gaps of different sizes in the automatic centering clamping device of the drill rod of the high-torque drilling rig, the centering problem during drill rod docking is solved, ensuring synchronous clamping of the drill rod, preventing tilting, and improving clamping accuracy and reliability.
Patent Information
- Application Number
- CN202422563585.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-23
AI Technical Summary
In the prior art, the drill rods are poorly aligned when docked, resulting in the slips being unable to move synchronously, causing the drill rods to tilt and damaging threads and components.
An automatic drill pipe centering clamping device for high-torque drilling rigs is designed. By setting piston pressure clearances of different sizes in the cylinder, the slips on one side reach the centering position first and then stop, while the slips on the other side provide clamping force to ensure the drill pipe is centered.
The drill rod can be synchronously moved during centering and clamping, thus avoiding the drill rod from tilting, protecting the drill rod and components, and improving the clamping accuracy and reliability.
Smart Images
Figure CN223343982U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drill rod centering, in particular to an automatic drill rod centering clamping device for a high-torque drilling rig. Background Art
[0002] Because the thread of the cable drill pipe is a flat thread, if the alignment of the drill pipes is not good, it will cause damage to the thread and the components therein.
[0003] At present, conventional split clamps use oil from both ends to push the pistons at both ends, which in turn push the slips to clamp the drill pipe. In order to prevent direct impact on the pistons during the process of oil pushing the pistons at both ends to move, a piston pressure gap is also set between the piston and the cylinder body.
[0004] After the piston and piston rod push the slips until the slip center coincides with the drill pipe's centering position, the slips can still be pushed forward a distance to achieve greater clamping force on the drill pipe. When the two pistons move synchronously and the two slips finally clamp the drill pipe and stop, the centers of the two slips coincide with the centering position. However, in practice, due to uncontrollable oil flow, the two pistons cannot move synchronously, and the slips at both ends cannot simultaneously clamp the drill pipe. When the slips clamp the drill pipe, the slip center and the centering position do not coincide, causing the drill pipe to tilt. Summary of the Invention
[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides an automatic centering clamping device for a drill rod for a high-torque drilling rig, so as to solve the problem in the prior art that the split clamp cannot center the drill rod when clamping the drill rod, causing the drill rod to tilt.
[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an automatic centering and clamping device for a drill rod of a high-torque drilling rig, comprising a centering and clamping body, oil cylinders symmetrically arranged on both sides of the centering and clamping body, the drill rod being arranged in the centering and clamping body, the oil cylinder comprising a cylinder body, a piston arranged in the cylinder body, and a piston rod sleeved in the piston, one end of the piston rod extending out of the cylinder body, and a slip fixed to the end of the piston rod, the two slips being used to jointly clamp the drill rod;
[0007] A piston pressure-bearing gap is provided between the piston and one side of the oil cylinder close to the slips, and the sizes of the two piston pressure-bearing gaps of the oil cylinders on both sides are different.
[0008] Furthermore, the oil cylinders on both sides of the centering clamping body are respectively the first oil cylinder and the second oil cylinder, the first oil cylinder includes a first cylinder body, a first piston, a first piston rod, a first cava, and a first piston pressure-bearing gap, and the second oil cylinder includes a second cylinder body, a second piston, a second piston rod, a second cava, and a second piston pressure-bearing gap.
[0009] Furthermore, the first piston pressure-bearing clearance is larger than the second piston pressure-bearing clearance.
[0010] Furthermore, when the second piston rod extends out of the cylinder to its maximum length, the distance from the end of the second piston rod to the center of the second slip - the distance from the end of the second piston rod to the center position of the drill pipe = the first piston pressure clearance - the second piston pressure clearance.
[0011] Furthermore, when the first piston rod extends out of the cylinder body to its maximum length, the center of the first slip coincides with the centering position of the drill rod.
[0012] Furthermore, the outer end of the cylinder body is provided with an end cover, and the side wall of the cylinder body is also provided with an oil inlet hole
[0013] Furthermore, the two oil cylinders are fixedly connected.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] The utility model changes the piston pressure-bearing gap so that the slips on one side stop moving when the slip center coincides with the centering position, and the slips on the other side provide a clamping force for the drill rod, thereby ensuring that the drill rod is located in the centering position. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic side sectional view of an embodiment of the present utility model;
[0017] In the picture:
[0018] Centering clamping body 1, first oil cylinder 21, first cylinder body 31, first piston 41, first piston rod 51, first slip 61, first piston pressure gap 71; second oil cylinder 22, second cylinder body 32, second piston 42, second piston rod 52, second slip 62, second piston pressure gap 72, end cover 8, oil inlet hole 9. DETAILED DESCRIPTION
[0019] 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 described embodiments are only part of the embodiments of the present invention, rather than all 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.
[0020] Example 1:
[0021] Depend on Figure 1As shown, an automatic centering and clamping device for a drill rod for a high-torque drilling rig includes a centering clamping body 1, a first oil cylinder 21 and a second oil cylinder 22 symmetrically arranged on either side of the centering clamping body 1, and a fixed connection between the two oil cylinders. The drill rod is arranged in the centering clamping body 1.
[0022] The first oil cylinder 21 includes a first cylinder body 31, a first piston 41 disposed in the first cylinder body 31, and a first piston rod 51 sleeved in the first piston 41. One end of the first piston rod 51 extends out of the first cylinder body 31, and a first slip 61 is fixed to the end of the first piston rod 51. A first piston pressure-bearing gap 71 is defined between the first piston 41 and a side of the first cylinder body 31 near the first slip 61.
[0023] The second oil cylinder 22 includes a second cylinder body 32, a second piston 42 disposed in the second cylinder body 32, and a second piston rod 52 sleeved in the second piston 42. One end of the second piston rod 52 extends out of the second cylinder body 32, and a second slip 62 is fixed to the end of the second piston rod 52. A second piston pressure-bearing gap 72 is defined between the second piston 42 and a side of the second cylinder body 32 close to the second slip 62.
[0024] The first slips 61 and the second slips 62 are used to jointly clamp the drill rod. The first piston pressure-bearing gap 71 and the second piston pressure-bearing gap 72 are of different sizes. The first piston pressure-bearing gap 71 is larger than the second piston pressure-bearing gap 72. The outer end of the cylinder body is provided with an end cap 8, and the side wall of the cylinder body is also provided with an oil inlet hole 9.
[0025] When the first piston rod 51 is extended from the cylinder to its maximum length, the center of the first slip 61 coincides with the drill rod centering position. When the second piston rod 52 is extended from the cylinder to its maximum length, the distance from the end of the second piston rod 52 to the center of the second slip 62 minus the distance from the end of the second piston rod 52 to the drill rod centering position equals the first piston pressure-bearing gap 71 minus the second piston pressure-bearing gap 72.
[0026] When the drill pipe is clamped, the stroke of the first piston 41 is limited due to the increase in the pressure-bearing gap 71 of the first piston. When the first piston 41 pushes the first piston rod 51, and then pushes the first cava 61 to the point where the center of the cava circle coincides with the centering position, it stops. Since the pressure-bearing gap 72 of the second piston is smaller, the stroke of the second piston 42 is longer, and the center of the second cava 62 can be pushed beyond the centering position.
[0027] If the drill rod is placed toward the first piston 41, the first oil cylinder 21 is filled with oil first, and the first piston 41 drives the first slip 61 to automatically push the drill rod to the center position and keep it stationary. Then the second oil cylinder 22 is filled with oil, and the second piston 42 drives the second slip 62 to clamp it.
[0028] If the drill rod is positioned toward the second piston 42 , the first oil cylinder 21 is filled with oil first, and the first piston 41 drives the first slip 61 to reach the center position and remain stationary. Then the second oil cylinder 22 is filled with oil, and the second piston 42 drives the second slip 62 to push the drill rod until it is clamped with the first slip 62 .
[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An automatic centering and clamping device for a drill rod of a high-torque drilling rig, characterized by: It includes a centering clamping body, oil cylinders symmetrically arranged on both sides of the centering clamping body, and a drill rod arranged in the centering clamping body. The oil cylinder includes a cylinder body, a piston arranged in the cylinder body, and a piston rod sleeved in the piston. One end of the piston rod extends out of the cylinder body, and a slip is fixed to the end of the piston rod. The two slips are used to clamp the drill rod together. A piston pressure-bearing gap is provided between the piston and one side of the cylinder body close to the slips, and the sizes of the two piston pressure-bearing gaps of the oil cylinders on both sides are different.
2. The automatic centering and clamping device for a drill rod of a high-torque drilling rig according to claim 1, characterized in that: The oil cylinders on both sides of the centering clamping body are respectively the first oil cylinder and the second oil cylinder. The first oil cylinder includes a first cylinder body, a first piston, a first piston rod, a first slip, and a first piston pressure-bearing gap. The second oil cylinder includes a second cylinder body, a second piston, a second piston rod, a second slip, and a second piston pressure-bearing gap.
3. The automatic centering and clamping device for a drill rod of a high-torque drilling rig according to claim 2, characterized in that: The first piston pressure-bearing gap is larger than the second piston pressure-bearing gap.
4. The automatic centering and clamping device for a drill rod of a high-torque drilling rig according to claim 2, characterized in that: When the second piston rod extends out of the cylinder to its maximum length, the distance from the end of the second piston rod to the center of the second slip - the distance from the end of the second piston rod to the center position of the drill pipe = the first piston pressure clearance - the second piston pressure clearance.
5. The automatic centering and clamping device for a drill rod of a high-torque drilling rig according to claim 2, characterized in that: When the first piston rod extends out of the cylinder body to its maximum length, the center of the first slip coincides with the centering position of the drill rod.
6. The automatic centering and clamping device for a drill rod of a high-torque drilling rig according to claim 1, characterized in that: An end cover is provided at the outer end of the cylinder body, and an oil inlet hole is also provided on the side wall of the cylinder body.
7. The automatic centering and clamping device for a drill rod of a high-torque drilling rig according to claim 1, characterized in that: The two cylinders are fixedly connected.