Internal expansion and external shrinkage type anti-deformation uniform load sleeve device for thin-wall drill rod thread turning

Abstract

The utility model relates to the technical field of machining, and discloses an internal expansion and external shrinkage type anti-deformation uniform-load sleeve device for thin-wall drill rod thread turning, which comprises an external constraint sleeve assembly, an external constraint sleeve assembly, an external constraint sleeve assembly and an internal constraint sleeve assembly, the external constraint sleeve assembly comprises a split sleeve body, an outer sleeve and an end cover, a plurality of through grooves are uniformly formed in the circumferential direction of the split sleeve body, and first external conical surfaces are symmetrically arranged at the two ends of the split sleeve body; the split sleeve body is sleeved with the outer sleeve and the end cover, the outer sleeve and the end cover are in threaded connection, and the end of the outer sleeve and the end of the end cover are each provided with a first inner conical surface. The inner supporting expansion sleeve assembly comprises a split type inner supporting body, second inner conical surfaces are symmetrically arranged on the inner wall of the split type inner supporting body, a left inner core and a right inner core which are connected through a connecting bolt are arranged in the split type inner supporting body, and second outer conical surfaces matched with the second inner conical surfaces are arranged on the outer side faces of the left inner core and the right inner core. The device can effectively solve the problem of deformation in the thread turning process of the thin-wall drill rod, the machining quality and efficiency are improved, and the service life of the device is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to an internally expanding and externally contracting anti-deformation load-equalizing sleeve device for thread turning of thin-walled drill pipes. Background Technology

[0002] The increasing demand for coalbed methane has driven a trend towards lightweight drill pipes, with wall thicknesses reduced from the traditional 8-12mm to 4-6mm. However, thin-walled structures are prone to deformation during processing, especially when threading, due to clamping and cutting forces. Traditional three-jaw chuck clamping methods lead to localized stress concentrations, which, combined with the anisotropy of cold-rolled tubing, further exacerbates the deformation problem. This not only affects product quality but also increases rework costs and hinders large-scale production efficiency. Existing solutions suffer from low clamping efficiency and high modification costs, making them unsuitable for meeting actual production needs. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide an internal expansion and external contraction anti-deformation load-sharing sleeve device for thread turning of thin-walled drill pipes, so as to solve the problems pointed out in the background art.

[0004] To achieve the aforementioned objectives of this utility model, the technical solution adopted is as follows:

[0005] A type of deformation-preventing and load-sharing sleeve device for thread turning of thin-walled drill pipes with internal expansion and external contraction, comprising:

[0006] An external constraint sleeve assembly includes a segmented sleeve body, an outer sleeve, and an end cap. The segmented sleeve body has multiple through slots evenly opened in the circumference along its length direction, and the two ends of the segmented sleeve body are symmetrically provided with first outer conical surfaces. The outer sleeve and the end cap are sleeved on the segmented sleeve body, and the outer sleeve and the end cap are threaded together. The ends of the outer sleeve and the end cap are respectively provided with first inner conical surfaces that match the first outer conical surfaces.

[0007] The internal support expansion sleeve assembly includes a segmented internal support body. The inner wall of the segmented internal support body is symmetrically provided with a second inner conical surface, and the two second inner conical surfaces are arranged in an inverted "V" shape. The segmented internal support body is provided with a left inner core and a right inner core, which are connected by connecting bolts. The outer surfaces of the left inner core and the right inner core are provided with a second outer conical surface that matches the second inner conical surface. The outer constraint sleeve assembly is used to provide a uniform radial constraint force on the outer wall of the thin-walled drill pipe; the internal support expansion sleeve assembly is used to provide a radial support force on the inner wall of the thin-walled drill pipe; the outer constraint sleeve assembly and the internal support expansion sleeve assembly work together to form a force balance system of "outer constraint-inner support".

[0008] As a further improvement of this utility model, there are eight through slots, and the width of the through slots is 4mm. The length of the through slots is 98% of the length of the sleeve, and 2% of the integrated structure is retained to ensure the overall rigidity.

[0009] As a further improvement of this utility model, the taper of the first outer conical surface is 30°.

[0010] As a further improvement of this utility model, the second inner conical surface is a 1:3 conical surface, and the surface of the second inner conical surface is coated with a molybdenum disulfide solid lubricant layer.

[0011] As a further improvement of this utility model, the connecting bolt is an M16×1.5 internal hexagonal flower-shaped cylindrical head bolt.

[0012] The beneficial effects of this utility model are:

[0013] 1. This utility model, through its unique internal expansion and external contraction structure design, can effectively solve the deformation problem caused by clamping force and cutting force during the thread turning process of thin-walled drill rods, thereby significantly improving processing quality, reducing scrap rate, increasing product yield, and thus improving production efficiency and reducing production costs.

[0014] 2. This utility model adopts a synergistic force balancing system of "external constraint-internal support". The external constraint sleeve assembly provides uniform radial constraint force, and the internal support expansion sleeve assembly provides radial support force, which effectively balances the cutting force and controls the roundness error of the thin-walled drill rod within 0.03mm, ensuring high-precision thread processing quality.

[0015] 3. The external constraint sleeve assembly of this utility model adopts an eight-lobed design, which makes the radial force distribution more uniform and effectively avoids the local stress concentration problem caused by the traditional three-jaw chuck clamping method, thereby reducing the deformation risk of thin-walled drill pipe.

[0016] 3. The second inner conical surface of this utility model adopts a 1:3 conical surface design and is coated with a molybdenum disulfide solid lubricating layer, which reduces the coefficient of friction, improves wear resistance, extends the service life of the device, and reduces the cost of use.

[0017] 4. This invention effectively solves the problem of clamping deformation during the thread turning process of thin-walled drill pipes, providing a reliable clamping solution for the efficient and precise machining of thin-walled drill pipes. Furthermore, the design of this device provides important technical support for the optimization of subsequent processes and intelligent production, promoting the progress and development of related technologies.

[0018] 5. This utility model features eight through-slots, each 4mm wide and 98% the length of the sleeve, retaining 2% of the integrated structure to ensure overall rigidity. The first outer conical surface has a taper of 30°, the second inner conical surface has a 1:3 conical surface, and the connecting bolts are M16×1.5 hexagonal socket head cap screws. These specific design parameters make the device structurally reasonable, facilitating manufacturing, installation, and use.

[0019] In summary, the internal expansion and external contraction anti-deformation load-sharing sleeve device for thread turning of thin-walled drill rods provided by this utility model can effectively solve the deformation problem in the thread turning process of thin-walled drill rods, improve processing quality and efficiency, extend the service life of the device, and provide support for process optimization and intelligent production. It has significant economic benefits and technological advancements, and has broad application prospects in the field of machining, especially in the processing of thin-walled drill rods. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the external constraint sleeve assembly structure;

[0023] Figure 3 Schematic diagram of the three-dimensional structure of the external constraint sleeve assembly

[0024] Figure 4 A schematic diagram of the three-dimensional structure of the segmented sleeve body.

[0025] Figure 5 This is a schematic diagram of the internal support expansion sleeve assembly structure;

[0026] Figure 6 This is a three-dimensional structural diagram of the internal support expansion sleeve assembly;

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the segmented internal support body.

[0028] In the figure: 1. Outer constraint sleeve assembly, 11. Split sleeve body, 12. Outer sleeve, 13. End cap, 14. Through groove, 15. First outer conical surface, 16. First inner conical surface, 2. Inner support expansion sleeve assembly, 21. Split inner support body, 22. Second inner conical surface, 23. Left inner core, 24. Right inner core, 25. Connecting bolt, 26. Second outer conical surface. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] like Figure 1-7 As shown, a type of anti-deformation load-sharing sleeve device with internal expansion and external contraction for thread turning of thin-walled drill pipes includes:

[0032] The external constraint sleeve assembly 1 includes a segmented sleeve body 11, an outer sleeve 12, and an end cap 13. The segmented sleeve body 11 has a plurality of through grooves 14 evenly opened in the circumferential direction and arranged along its length direction. The two ends of the segmented sleeve body 11 are symmetrically provided with first outer conical surfaces 15. The outer sleeve 12 and the end cap 13 are sleeved on the segmented sleeve body 11. The outer sleeve 12 and the end cap 13 are threaded together. The ends of the outer sleeve 12 and the end cap 13 are respectively provided with first inner conical surfaces 16 that match the first outer conical surfaces 15.

[0033] The inner support expansion sleeve assembly 2 includes a segmented inner support body 21. The inner wall of the segmented inner support body 21 is symmetrically provided with second inner conical surfaces 22, and the two second inner conical surfaces 22 are arranged in an inverted "V" shape. The segmented inner support body 21 is provided with a left inner core 23 and a right inner core 24. The left inner core 23 and the right inner core 24 are connected by connecting bolts 25. The outer surfaces of the left inner core 23 and the right inner core 24 are provided with second outer conical surfaces 26 that match the second inner conical surfaces 22. The outer constraint sleeve assembly 1 is used to provide a uniform radial constraint force on the outer wall of the thin-walled drill pipe; the inner support expansion sleeve assembly 2 is used to provide radial support force on the inner wall of the thin-walled drill pipe. The outer constraint sleeve assembly 1 and the inner support expansion sleeve assembly 2 work together to form a force balance system of "outer constraint-inner support".

[0034] The through groove 14 is provided in eight parts, and the width of the through groove 14 is 4mm. The length of the through groove 14 is 98% of the length of the sleeve, and 2% of the integral structure is retained to ensure the overall rigidity.

[0035] The first outer conical surface 15 has a taper of 30°.

[0036] The second inner conical surface 22 is a 1:3 conical surface, and the surface of the second inner conical surface 22 is coated with a molybdenum disulfide solid lubricant layer.

[0037] The connecting bolt 25 is an M16×1.5 internal hexagonal flower-shaped cylindrical head bolt.

[0038] When machining a Φ90.5×5.85mm drill pipe, first place the workpiece inside the split sleeve body 11, tighten the end cap 13 to move the outer sleeve 12 axially, and generate a uniform radial clamping force through the 30° conical surface fit; then install the inner support expansion sleeve assembly 2, tighten the connecting bolt 25 to move the left inner core 23 and the right inner core 24 relative to each other, and the double conical surface mechanism generates a radial support force. Actual measurements show that this invention can achieve a turning roundness error of ≤0.03mm for thin-walled drill pipes, a thread pitch diameter qualification rate of over 98.5%, and a single clamping time of no more than 3 minutes.

[0039] This invention is not only applicable to the processing of coalbed methane drill pipes, but can also be extended to the precision processing of thin-walled parts such as oil casing and aerospace fittings, and has significant economic benefits and application value.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, component disassembly or combination, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A type of internally expanding and externally contracting anti-deformation load-sharing sleeve device for thread turning of thin-walled drill pipes, characterized in that, include: An external constraint sleeve assembly includes a segmented sleeve body, an outer sleeve, and an end cap. The segmented sleeve body has multiple through slots evenly opened in the circumference along its length direction, and the two ends of the segmented sleeve body are symmetrically provided with first outer conical surfaces. The outer sleeve and the end cap are sleeved on the segmented sleeve body, and the outer sleeve and the end cap are threaded together. The ends of the outer sleeve and the end cap are respectively provided with first inner conical surfaces that match the first outer conical surfaces. The inner support expansion sleeve assembly includes a segmented inner support body. The inner wall of the segmented inner support body is symmetrically provided with a second inner conical surface, and the two second inner conical surfaces are arranged in an inverted "V" shape. The segmented inner support body is provided with a left inner core and a right inner core. The left inner core and the right inner core are connected by connecting bolts. The outer surfaces of the left inner core and the right inner core are provided with a second outer conical surface that matches the second inner conical surface.

2. The internal expansion and external contraction type anti-deformation load-sharing sleeve device for thread turning of thin-walled drill pipes according to claim 1, characterized in that: The through slots are provided in eight parts, and the width of the through slots is 4mm, and the length of the through slots is 98% of the length of the sleeve.

3. The internal expansion and external contraction type anti-deformation load-sharing sleeve device for thread turning of thin-walled drill pipes according to claim 1, characterized in that: The taper of the first outer cone surface is 30°.

4. The internal expansion and external contraction type anti-deformation load-sharing sleeve device for thread turning of thin-walled drill pipes according to claim 1, characterized in that: The second inner conical surface is a 1:3 conical surface, and the surface of the second inner conical surface is coated with a molybdenum disulfide solid lubricant layer.

5. The internal expansion and external contraction type anti-deformation load-sharing sleeve device for thread turning of thin-walled drill pipes according to claim 1, characterized in that: The connecting bolt is an M16×1.5 internal hexagonal flower-shaped cylindrical head bolt.

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