Drilling machine slip assembly

Abstract

The utility model relates to a drilling machine slip assembly which comprises a slip bowl. The device further comprises a tile clamping strip and a positioning block. A side groove is formed in the slip bowl, an embedding groove and a positioning groove are formed in the side groove, and the embedding groove is communicated with the positioning groove; the tile clamping strips are detachably arranged in the embedding grooves, and the positioning blocks are detachably arranged in the positioning grooves. The positioning block abuts against one side of the tile clamping strip, and the positioning block and the side wall of the caulking groove form positioning of the tile clamping strip. Slip patterns and positioning bulges are arranged on a strip body of the slip strip; a positioning groove is formed in the positioning block, and the positioning protrusion is located in the positioning groove. According to the drilling machine slip assembly, the structure of the slip assembly is redesigned, each slip batten is independently positioned, and the whole slip batten does not need to be disassembled when the slip battens need to be replaced; and the middle part of the slip batten is clamped and positioned through the concave-convex structure, so that the failure risk is reduced when the slip batten is subjected to axial stress.

Description

Technical Field

[0001] The utility model relates to the field of trenchless drilling rigs, and particularly to a chuck assembly of a drilling rig. Background Art

[0002] A trenchless drilling rig is used to perform operations such as drilling, boring, pipeline laying, and reaming without excavating the ground. On the drill rig of the trenchless drilling rig, a chuck is used to clamp the drill pipe to achieve the spiral assembly and disassembly of the drill pipe.

[0003] In the existing chuck assembly, as Figure 1 shown, the chuck block 8 is located on the chuck seat 1 ， and both ends of the chuck block 8 are limited in a head - end manner through an integral baffle 9 to prevent the axial movement of the chuck block 8.

[0004] Although this structure can prevent the axial movement of the chuck block 8 to a certain extent, when the chuck block 8 is worn and needs to be replaced, the entire baffle 9 at both ends must be removed, which is inconvenient.

[0005] Moreover, during the operation of the chuck block 8, when clamping the drill pipe, an axial force is generated, and this axial force directly acts on the baffle 9, specifically in the axial direction of the screw for fixing the baffle 9. After long - term operation, the screw for fixing the baffle 9 will fail, resulting in the failure of the chuck assembly. Summary of the Utility Model

[0006] The purpose of the utility model is:

[0007] To design a chuck assembly of a drilling rig, re - design the structure of the chuck assembly, position each chuck strip separately, so that when the chuck strip needs to be replaced, it is not necessary to disassemble the whole; and through the concave - convex structure, the middle part of the chuck strip is clamped and positioned, reducing the risk of failure when the chuck strip is subjected to axial stress.

[0008] To achieve the above purpose, the utility model provides the following technical solutions:

[0009] A chuck assembly of a drilling rig includes a chuck seat; it also includes chuck strips and positioning blocks; side grooves are provided on the chuck seat, and an embedding groove and a positioning groove are provided in the side grooves, and the embedding groove communicates with the positioning groove; the chuck strips are detachably arranged in the embedding groove, and the positioning blocks are detachably arranged in the positioning groove; the positioning blocks abut against one side of the chuck strips and together with the side walls of the embedding groove form the positioning of the chuck strips; chuck threads and positioning protrusions are provided on the strip bodies of the chuck strips; positioning grooves are provided on the positioning blocks, and the positioning protrusions are located in the positioning grooves.

[0010] Further, both the side grooves and the embedding grooves run through both ends of the chuck seat transversely, and the chuck strips extend along the length direction of the embedding grooves.

[0011] Further, the positioning block is movably connected to the positioning groove by screws, and the positioning block is located on the side of the slip strip away from the insertion groove.

[0012] Further, an inclined top surface is provided on the positioning block. Both the inclined top surface and the positioning groove protrude from the positioning groove, and the inclined top surface is located on both sides of the positioning groove.

[0013] Further, the included angle between the inclined top surface and the side wall of the insertion groove is an acute angle, and the inclined top surface, the bottom wall and the side wall of the insertion groove together form a dovetail groove structure.

[0014] Further, the positioning protrusion is located in the middle of the side surface of the strip, and the positioning protrusion is integrally formed with the strip.

[0015] Further, the slip strip and the positioning block are arranged symmetrically up and down with respect to the central axis of the slip seat.

[0016] The beneficial effects of the present utility model are as follows:

[0017] A drill chuck assembly is applied to the drill rig of a trenchless drill rig. The structure of the chuck assembly is redesigned. Each slip strip is individually positioned by a positioning block. When the slip strip needs to be replaced, only the corresponding positioning block needs to be removed, without the need for overall disassembly. And the positioning block is located in the positioning groove, and the positioning block uses the concave-convex structure to clamp and position the middle part of the slip strip, enhancing the positioning stability of the slip strip. When the slip strip is subjected to axial stress, the failure risk can be greatly reduced, and the reliability of the structure is improved. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a chuck assembly of the prior art.

[0019] Figure 2 It is an overall three-dimensional structural diagram of a drill chuck assembly of the present utility model.

[0020] Figure 3 It is a partial structural schematic diagram of a drill chuck assembly of the present utility model.

[0021] Figure 4 It is a schematic structural diagram of a slip strip of a drill chuck assembly of the present utility model.

[0022] The reference signs are:

[0023] 1, slip seat; 2, side groove; 3, insertion groove; 4, positioning groove; 5, slip strip; 51, strip; 52, chuck pattern; 53, positioning protrusion; 6, positioning block; 61, inclined top surface; 62, positioning groove; Detailed Embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the following further describes the present utility model in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] Reference Figures 2 to 4 , a drill chuck assembly, including a chuck seat 1; the chuck seat 1 is fixed on the drill rig of the trenchless drill rig. The chuck assembly is used to clamp the drill pipe.

[0026] The drill chuck assembly further includes a chuck bar 5 and a positioning block 6; the chuck bar 5 is used to clamp the drill pipe, and the positioning block 6 is used to clamp and position the chuck bar 5 to prevent it from axially moving.

[0027] A side groove 2 is provided on the chuck seat 1, an embedding groove 3 and a positioning groove 4 are provided in the side groove 2, and the embedding groove 3 communicates with the positioning groove 4; the side groove 2 is located on the side of the chuck seat 1, the embedding groove 3 is located at the upper and lower parts in the side groove 2; the positioning groove 4 is located at a position close to the middle of the side groove 2.

[0028] The chuck bar 5 is detachably arranged in the embedding groove 3 and can be replaced after wear, and the positioning block 6 is detachably arranged in the positioning groove 4 for realizing the disassembly and replacement of the chuck bar 5.

[0029] The positioning block 6 presses against one side of the chuck bar 5 and together with the side wall of the embedding groove 3 forms the positioning of the chuck bar 5; it is used to stably position the whole chuck bar 5 to prevent the chuck bar 5 from displacing relative to the chuck seat 1.

[0030] A chuck pattern 52 and a positioning protrusion 53 are provided on the bar body 51 of the chuck bar 5; the chuck pattern 52 is used to increase the friction between the chuck bar 5 and the drill pipe to prevent the drill pipe from slipping. The positioning protrusion 53 is used to realize the positioning of the chuck bar 5.

[0031] A positioning groove 62 is provided on the positioning block 6, the positioning protrusion 53 is located in the positioning groove 62, and the positioning protrusion 53 is embedded in the positioning groove 62 to form a stable positioning structure.

[0032] Both the side groove 2 and the embedding groove 3 horizontally penetrate through both ends of the chuck seat 1, and the chuck bar 5 extends along the length direction of the embedding groove 3, which can make the chuck bar 5 along the axial direction of the drill pipe, thereby increasing the contact area between the chuck bar 5 and the drill pipe.

[0033] The positioning block 6 is movably connected to the positioning groove 4 by screws, and the positioning block 6 is located on the side of the chuck bar 5 away from the embedding groove 3; at least part of the positioning block 6 is embedded in the positioning groove 4. The contour of the positioning groove 4 is adapted to the positioning block 6.

[0034] The positioning block 6 is provided with an inclined top surface 61. Both the inclined top surface 61 and the positioning groove 62 protrude from the positioning slot 4, and the inclined top surface 61 is located on both sides of the positioning groove 62. The inclined top surface 61 is used to press against the side surface of the slip strip 5 to form a pressing type positioning.

[0035] The included angle between the inclined top surface 61 and the side wall of the embedded groove 3 is an acute angle. The inclined top surface 61, the bottom wall and the side wall of the embedded groove 3 together form a dovetail groove structure, so as to form a stable positioning and clamping for the strip body 51 of the slip strip 5.

[0036] The positioning protrusion 53 is located in the middle of the side surface of the strip body 51, and the positioning protrusion 53 is integrally formed with the strip body 51. The slip strip 5 is made of wear-resistant metal material as a whole, with a hard texture and strong wear resistance, and is not easy to fail.

[0037] The slip strip 5 and the positioning block 6 are arranged symmetrically up and down with respect to the central axis of the slip seat 1, and can clamp the drill pipe at multiple places to avoid the bad phenomenon of the drill pipe slipping.

[0038] The working principle of a drill pipe slip assembly of the present utility model is as follows:

[0039] The positioning block 6 is located in the positioning slot 4 and is detachably connected to the bottom of the positioning slot 4 by screws. When the slip strip 5 clamps the drill pipe and is subjected to axial stress, the force is transmitted to the positioning block 6 through the positioning protrusion 53 on the strip body 51 of the slip strip 5 and the positioning groove 62.

[0040] Since the positioning block 6 is embedded in the positioning slot 4, the stress received by the positioning block 6 will be borne by the positioning slot 4 and the screws, and the direction of the force is the radial direction of the screws, rather than the axial direction. Therefore, the cooperation of the positioning slot 4 and the screws can bear greater stress without undergoing destructive deformation.

[0041] The engagement of the positioning protrusion 53 and the positioning groove 62 can position the middle part of the slip strip 5. Moreover, the side wall of the embedded groove 3 and the inclined top surface 61 form a dovetail structure, which also performs an integral positioning on the strip body 51 of the slip strip 5, and can prevent the slip strip 5 from axially moving.

[0042] When the slip pattern 52 of the slip strip 5 is significantly worn and needs to be replaced, unscrew the screws fixing the positioning block 6, take out the positioning block 6 from the positioning slot 4, and then the slip strip 5 can be taken out from the embedded groove 3, which is convenient for the disassembly and replacement operation of the slip strip 5.

[0043] The above embodiments are used to further illustrate the present utility model, but do not limit the present utility model to these specific embodiments. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be understood to be within the protection scope of the present utility model.

Claims

1. A drill pipe slip assembly, comprising a slip seat (1); characterized in that: It further includes a slip strip (5) and a positioning block (6); a side groove (2) is provided on the slip seat (1), an embedding groove (3) and a positioning groove (4) are provided in the side groove (2), and the embedding groove (3) communicates with the positioning groove (4); the slip strip (5) is detachably arranged in the embedding groove (3), and the positioning block (6) is detachably arranged in the positioning groove (4); the positioning block (6) abuts against one side of the slip strip (5) and together with the side wall of the embedding groove (3) forms the positioning of the slip strip (5); a slip pattern (52) and a positioning protrusion (53) are provided on the strip body (51) of the slip strip (5); a positioning groove (62) is provided on the positioning block (6), and the positioning protrusion (53) is located in the positioning groove (62).

2. The kelly bushing assembly of a drill rig according to claim 1, wherein: Both the side groove (2) and the embedding groove (3) run through both ends of the slip seat (1) transversely, and the slip strip (5) extends along the length direction of the embedding groove (3).

3. The kelly bushing assembly of a drilling rig according to claim 2, wherein: The positioning block (6) is movably connected to the positioning groove (4) by screws, and the positioning block (6) is located on the side of the slip strip (5) away from the embedding groove (3).

4. The kelly bushing assembly according to claim 3, characterized in that: An inclined top surface (61) is provided on the positioning block (6), both the inclined top surface (61) and the positioning groove (62) protrude from the positioning groove (4), and the inclined top surface (61) is located on both sides of the positioning groove (62).

5. The kelly bushing assembly of a drill rig according to claim 4, characterized in that: The included angle between the inclined top surface (61) and the side wall of the embedding groove (3) is an acute angle, and the inclined top surface (61), together with the bottom wall and the side wall of the embedding groove (3), forms a dovetail groove structure.

6. A drill slip assembly according to any one of claims 1-5, characterized in that: The positioning protrusion (53) is located in the middle of the side surface of the strip body (51), and the positioning protrusion (53) is integrally formed with the strip body (51).

7. The kelly bushing assembly of a drill rig according to claim 6, characterized in that: The slip strip (5) and the positioning block (6) are arranged symmetrically up and down with respect to the central axis of the slip seat (1).

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