Self-clamping holder

Abstract

The self-clamping holder comprises a holder body and a centralizer, the holder body comprises a movable clamping seat, a clamping oil cylinder and a fixed clamping ring, a slip groove is formed in the movable clamping seat, a slip is arranged in the slip groove, a driving sleeve is arranged in the fixed clamping ring, and the self-clamping holder further comprises a fixing frame; the centralizer comprises a centralizer body, a bearing, a mandrel and a centralizing sleeve, a shaft clamp spring is arranged on the outer circumferential surface of one side, close to the clamping oil cylinder, of the mandrel, a hole clamp spring is arranged on the inner circumferential surface of one side, far away from the clamping oil cylinder, of the mandrel, and the centralizing sleeve is mounted on the inner circumferential surface of the mandrel through the hole clamp spring; according to the clamp holder, the previous five-point clamping mode is changed into the three-point clamping mode of simultaneously clamping the three slips, and compared with the previous five-point clamping mode, the clamping stability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a self-clamping clamp. Background Art

[0002] The clamp is responsible for clamping, twisting and unloading the drill pipe. During the clamping process, especially when clamping deep holes, the drill tool is too heavy, and the clamp has the phenomenon of slipping drill due to insufficient clamping capacity. At the same time, the self-leakage of the hydraulic oil in the clamping cylinder may also cause accidents during the construction process. The reliability is very poor, the clamping quality is unstable, and the drill pipe is subjected to twisting stress and large centrifugal shaking when drilling at high speed. The drill pipe and the slips in the clamp will be pitted, reducing the service life of the slips and the drill pipe. At the same time, when the clamp is clamping the drill pipe, the five-point encircling clamping has a situation where a single slip cannot clamp the drill pipe. High processing precision must be required, which wastes costs. In addition, the pressure per unit area of ​​the drill pipe is uneven, and the contact quality between the slip and the drill pipe is unstable, which can easily lead to deformation of the drill pipe, insufficient clamping force, and even drilling accidents such as drill drop. This not only affects work efficiency and causes waste of resources, but also increases economic costs invisibly.

[0003] For example, a drill rod hydraulic clamp with national patent publication number CN216974761U includes a drill rod clamp and a stabilizer, the drill rod clamp includes a cava seat and a cava for clamping the outer peripheral surface of the drill rod, the inner surface of the cava is a clamping surface, and the outer surface is an inclined surface, the cava seat is sheathed with a driving sleeve for driving the cava, and the driving sleeve is provided with a driving surface that cooperates with the inclined surface on the cava, and is characterized in that: the drill rod clamp is provided with a hydraulic cylinder for driving the driving sleeve to move up and down, the hydraulic cylinder includes a cylinder body, a piston and a piston rod connected to the piston, the piston rod is connected to the driving sleeve, a rod cavity and a rodless cavity are formed on both sides of the piston in the cylinder body, a nitrogen spring is installed in the rodless cavity, and an oil filling hole is opened on the cylinder body at the rod cavity.

[0004] It was found through use that the hydraulic cylinder had insufficient stability, and the traditional five-point clamping form had the problem that a single slip could not clamp the drill rod. Therefore, the existing equipment was improved to meet the use requirements. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a self-clamping clamp with reasonable structural design and more stable drill rod clamping state in view of the deficiencies in the prior art.

[0006] The technical problem to be solved by the utility model is achieved through the following technical solutions: a self-clamping clamp, including a clamp and a straightener, the clamp including a movable clamping seat, a clamping oil cylinder and a fixed clamping ring, a slip groove is provided on the movable clamping seat, a slip for clamping the outer peripheral surface of the drill pipe is arranged in the slip groove, a driving sleeve used in conjunction with the slip is arranged in the fixed clamping ring, the cylinder barrel of the clamping oil cylinder is connected to the movable clamping seat, the cylinder rod is connected to the fixed clamping ring, and also includes a fixing frame penetrated by the cylinder rod of the clamping oil cylinder, and the fixing frame is fixed on a side surface of the fixed clamping ring facing the cylinder barrel of the clamping oil cylinder;

[0007] The centralizer comprises a centralizer body, a bearing, a core shaft and a centralizer sleeve which are arranged in sequence from the outside to the inside. The centralizer body is fixedly connected to the side of the fixed clamping ring away from the clamping cylinder. The bearing is located between the core shaft and the centralizer body. A shaft retaining spring is arranged on the outer circumference of the core shaft on the side close to the clamping cylinder, and a hole retaining spring is arranged on the inner circumference of the core shaft on the side away from the clamping cylinder. The centralizer sleeve is installed on the inner circumference of the core shaft through the hole retaining spring.

[0008] Preferably, three slips are equidistantly arranged with respect to the axis of the movable seat.

[0009] Preferably, a pressure cover is provided on a side surface of the movable clamping seat away from the clamping cylinder.

[0010] Preferably, a round nut is provided on the cylinder rod of the clamping cylinder to fasten the fixing collar and the fixing frame into one.

[0011] Preferably, an oil groove is provided on the outer peripheral surface of the centralizer body, the outlet end of the oil groove is arranged opposite to the bearing, and an oil cup is arranged at the inlet end of the oil groove.

[0012] Compared with the prior art, the beneficial technical effect of the utility model is that the clamp changes the previous five-point clamping into a three-point clamping form in which three cavas clamp simultaneously, which has higher clamping stability than the previous five-point clamping, and a fixing frame is also provided on the end of the cylinder rod of the clamping cylinder, so that the multiple clamping cylinders on the clamp are more stable when extending / retracting the cylinder rod; the round nut fixes the cylinder rod of the clamping cylinder to the fixed clamping ring by means of a threaded fastening connection, eliminates the original pin shaft fixation, further simplifies the structure of the movable clamping ring, has strong stability, is easy to disassemble and assemble, and is reliable and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a partial cross-sectional structural schematic diagram of the socket of the utility model;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the centralizer of the utility model.

[0015] In the figure, 1. movable seat; 2. clamping cylinder; 3. fixed clamping ring; 4. slip groove; 5. slip; 6. driving sleeve; 7. fixing frame; 8. stabilizer body; 9. bearing; 10. spindle; 11. straightening sleeve; 12. retaining ring for shaft; 13. retaining ring for hole; 14. pressure cover; 15. round nut; 16. oil tank; 17. oil cup. DETAILED DESCRIPTION

[0016] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0017] Example 1, reference Figure 1-2 A self-clamping clamp comprises a clamp and a straightener, the clamp comprises a movable clamping seat 1, a clamping oil cylinder 2 and a fixed clamping ring 3, a slip groove 4 is provided on the movable clamping seat 1, a slip 5 for clamping the outer peripheral surface of the drill pipe is arranged in the slip groove 4, a driving sleeve 6 used in conjunction with the slip 5 is arranged in the fixed clamping ring 3, the cylinder barrel of the clamping oil cylinder 2 is connected to the movable clamping seat 1, the cylinder rod is connected to the fixed clamping ring 3, and also comprises a fixing frame 7 penetrated by the cylinder rod of the clamping oil cylinder 2, the fixing frame 7 is formed into a roughly plate-shaped structure, and the fixing frame 7 is fixed on one side of the fixed clamping ring 3 facing the cylinder barrel of the clamping oil cylinder 2;

[0018] The centralizer comprises a centralizer body 8, a bearing 9, a core shaft 10 and a centralizer sleeve 11 which are arranged in sequence from the outside to the inside. The centralizer body 8 is fixedly connected to the side of the fixed clamping ring 3 away from the clamping cylinder 2. The bearing 9 is located between the core shaft 10 and the centralizer body 8. A shaft retaining spring 12 is arranged on the outer peripheral surface of the core shaft 10 close to the clamping cylinder 2, and a hole retaining spring 13 is arranged on the inner peripheral surface of the core shaft 10 away from the clamping cylinder 2. The centralizer sleeve 11 is installed on the inner peripheral surface of the core shaft 10 through the hole retaining spring 13. The centralizer cancels the original threaded fastening connection and adopts the hole retaining spring 13 and the shaft retaining spring 12 for installation, which simplifies the installation and disassembly method and saves a lot of time cost.

[0019] The slips 5 are arranged in three equal intervals based on the axis of the movable clamping seat 1. By adopting a three-point circular embracing clamping design, the previous five-point clamping is cancelled, so that when clamping the drill rod, the pressure per unit area is more evenly distributed while the clamping capacity remains unchanged, and the contact quality between the slips 5 and the drill rod is more stable, avoiding deformation or even damage of the drill rod due to uneven clamping force.

[0020] A pressure cover 14 is provided on a side surface of the movable clamping seat 1 away from the clamping cylinder 2 .

[0021] A round nut 15 is provided on the cylinder rod of the clamping cylinder 2 to fasten the fixing clamp ring 3 and the fixing frame 7 together. The round nut 15 is connected by threaded fastening to fix the cylinder rod of the clamping cylinder 2 on the fixing clamp ring 3, further simplifying the structure of the fixing clamp ring 3, having strong stability, convenient disassembly and assembly, and being reliable and durable.

[0022] An oil groove 16 is provided on the outer peripheral surface of the centralizer body 8, the outlet end of the oil groove 16 is directly opposite to the bearing 9, and an oil cup 17 is provided at the inlet end of the oil groove 16. The oil groove 16 and the oil cup 17 facilitate lubrication of the bearing 9, solve the problem that the bearing 9 cannot be lubricated when rotating at high speed for a long time, and increase the service life of the bearing 9.

[0023] The self-tightening clamp adopts a three-point circular embracing clamping design to eliminate the previous five-point clamping, so that the pressure per unit area of ​​the drill rod is more evenly distributed, the contact quality of the slip 5 and the drill rod is more stable, and the drill rod is prevented from being deformed or even damaged due to uneven clamping force. The setting of the fixed clamp ring 3 can maintain the concentricity of the stabilizer to prevent the stabilizer from being hit by the rotation of the drill rod and cutting off the bolt. In addition, the round nut 15 fixes the cylinder rod of the clamping cylinder 2 to the fixed clamp ring 3 by adopting a threaded fastening connection, eliminating the original pin shaft fixation, further simplifying the structure of the movable clamp ring, and having strong stability, convenient disassembly and assembly, reliability and durability; and the straightening sleeve 11 can be made of flexible wear-resistant material, that is, while limiting the shaking amplitude of the drill rod during high-speed rotation, it can also avoid pitting of the drill rod, extend the service life of the drill rod, avoid the occurrence of construction accidents, meet the needs of users, improve work efficiency, and enhance labor quality and efficiency. Straightening sleeves 11 of different sizes can be selected according to the drill rod.

Claims

1. A self-tightening clamp, comprising a clamp and a centralizer, wherein the clamp comprises a movable clamping seat, a clamping oil cylinder and a fixed clamping ring, wherein a slip groove is provided on the movable clamping seat, wherein slips for clamping the outer peripheral surface of a drill pipe are provided in the slip groove, wherein a driving sleeve for use in conjunction with the slips is provided in the fixed clamping ring, wherein the cylinder barrel of the clamping oil cylinder is connected to the movable clamping seat, and the cylinder rod is connected to the fixed clamping ring, wherein the driving sleeve is provided in the fixed clamping ring, wherein the driving sleeve is provided in conjunction with the slips, wherein the driving sleeve is provided in conjunction with the movable clamping seat, and the cylinder rod is connected to the fixed clamping ring, wherein the driving sleeve is provided in conjunction with the slips, and wherein the driving sleeve is provided in conjunction with the slips, wherein the driving sleeve is provided in conjunction with the movable clamping seat, and the driving sleeve is provided in conjunction with the fixed clamping ring, and wherein the driving sleeve is provided in conjunction with the slips, and the It also includes a fixing frame which is penetrated by the cylinder rod of the clamping oil cylinder, and the fixing frame is fixed on a side surface of the fixing collar facing the cylinder barrel of the clamping oil cylinder; The centralizer comprises a centralizer body, a bearing, a core shaft and a centralizer sleeve which are arranged in sequence from the outside to the inside. The centralizer body is fixedly connected to the side of the fixed clamping ring away from the clamping cylinder. The bearing is located between the core shaft and the centralizer body. A shaft retaining spring is arranged on the outer circumference of the core shaft on the side close to the clamping cylinder, and a hole retaining spring is arranged on the inner circumference of the core shaft on the side away from the clamping cylinder. The centralizer sleeve is installed on the inner circumference of the core shaft through the hole retaining spring.

2. A self-tightening clamp according to claim 1, characterized in that: The slips are arranged three at equal distances based on the axis of the movable clamping seat.

3. A self-tightening clamp according to claim 1, characterized in that: A pressure cover is arranged on a side surface of the movable clamping seat away from the clamping oil cylinder.

4. A self-tightening clamp according to claim 1, characterized in that: A round nut for fastening the fixing collar and the fixing frame as a whole is arranged on the cylinder rod of the clamping oil cylinder.

5. A self-tightening clamp according to claim 1, characterized in that: An oil groove is provided on the outer peripheral surface of the centralizer body, the outlet end of the oil groove is arranged opposite to the bearing, and an oil cup is arranged at the inlet end of the oil groove.

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