drill pipe swivel

Abstract

The application relates to the technical field of connectors, and discloses a drill rod variable head, which comprises a cylinder, a sleeve one, a sleeve two and two limiting assemblies, the sleeve one and the sleeve two are detachably sleeved at two ends inside the cylinder, a drill rod is pluggably sleeved in the sleeve one, the sleeve one is fixed inside one end of the cylinder through insertion of the drill rod, a drill bit is pluggably sleeved in the sleeve two, the sleeve two is fixed inside the other end of the cylinder through insertion of the drill bit, one limiting assembly fixes the drill rod and one end of the cylinder, and the other limiting assembly fixes the drill bit and the other end of the cylinder. The drill rod and the sleeve one and the drill bit and the sleeve two are connected first, then the cylinder is connected and fastened with the drill rod and the drill bit through a screw rod, a connecting ring is formed, the rings are buckled one by one, the connection is firm and reliable, the overall structure is simple, and the drill rod and the drill bit can be connected efficiently and conveniently.

Description

Technical Field

[0001] This invention relates to the field of joint technology, and more particularly to a drill pipe variable head. Background Technology

[0002] A drill pipe reducer, also known as a drill pipe diameter reducer, is used to connect drill bits with a diameter different from that of the drill pipe. During operation, the drill pipe must withstand enormous internal and external pressure, torsion, bending, and vibration, all of which are transmitted to the reducer. To withstand the varying resistance from different terrains, different drill bits are typically used. This is where the reducer comes in, connecting drill bits of different diameters to the drill pipe. Currently, drill pipe reducers can only connect to drill bits of a specific size and cannot accommodate different sizes as needed. This necessitates replacing the reducer each time a different drill bit is required, which is inconvenient and reduces work efficiency. However, some technologies have made improvements in this area.

[0003] Chinese invention patent application number 202010281778.X discloses a drill rod changer. It features a transition tube, a fixed tube, a guide plate, and a guide hole, with a threaded tube at the tail end connected to the drill rod. A lead screw, a slot, a threaded sleeve, a clamping plate, and a pad are included. An external handle passes through the through hole and slot to rotate the lead screw. Both sets of lead screws rotate simultaneously in the same direction under the action of a rotating shaft, thus pushing the threaded sleeve inward. The threaded sleeve drives the moving plate inward, adjusting the distance between the two clamping plates to fix drill bits of different specifications. A slide rail, a slider, and a moving plate are used to restrict the clamping plates, preventing them from shaking. This provides a preliminary solution to the problem of fixing drill bits of different specifications.

[0004] However, the following problems will occur during the use of this application: As can be seen from the description and the attached drawings, although the structure is relatively complex, it actually uses a lead screw to drive two opposing clamping plates to clamp and fix the drill bit. At the same time, the opening and closing degree of the two clamping plates can be adjusted to clamp drill bits of different specifications. Obviously, this clamping force is relatively limited. Once a large rotational resistance is encountered during drilling, the clamping is not reliable. In addition, this technical solution is only for a single specification of drill rod. Once the drill rod specification changes, it cannot be applied. In order to improve the above situation, we propose a drill rod variable head with reliable clamping. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art and provide a drill pipe variable head.

[0006] The technical solution of the present invention is as follows: A drill rod variable head includes a cylinder, a first sleeve, a second sleeve, and two limiting components. The first sleeve and the second sleeve are detachably fitted inside the two ends of the cylinder. The drill rod is insertably fitted into the first sleeve. The first sleeve is fixed inside one end of the cylinder by the insertion of the drill rod. The drill bit is insertably fitted into the second sleeve. The second sleeve is fixed inside the other end of the cylinder by the insertion of the drill bit. One limiting component fixes the drill rod and one end of the cylinder, and the other limiting component fixes the drill bit and the other end of the cylinder.

[0007] Preferably, the cylinder is a cylindrical structure with open ends, a limiting ring is provided on the inner wall of the middle section of the cylinder, through holes are provided at both ends of the cylinder near the middle section, and multiple limiting grooves are provided at intervals on the inner wall of both ends of the cylinder.

[0008] The open ends facilitate the insertion of drill rods and drill bits, and also make it easy to install sleeve one and sleeve two. The limiting ring can easily position the inserted drill bit and drill rod.

[0009] Preferably, sleeve one and sleeve two have the same structure. Sleeve one includes a positioning disk, an upper part and a lower part arranged in sequence. The positioning disk is annular. The upper part is a cylindrical structure with open ends. One end of the upper part is integrally connected with the positioning disk. The other end of the upper part is integrally set with one end of the lower part. The other end of the lower part is provided with multiple U-shaped notches along the axis. The lower part is bent inward and elastic and can be stretched into a cylindrical shape. Multiple limiting blocks corresponding to the limiting grooves are raised on the outer surface of the lower part.

[0010] Both sleeve one and sleeve two are only a portion of the drill rod or drill bit inserted into the cylinder. The positioning plate is locked at the port of the cylinder for easy positioning. The upper part serves as a transition, and the lower part serves as the positioning of the drill rod or drill bit, as well as the connection and fixation between the drill rod and drill bit and sleeve one and sleeve two.

[0011] Preferably, the limiting component includes multiple double-ended screws and multiple nuts, and multiple threaded blind holes corresponding to the double-ended screws are provided at intervals along the outer circular surface on both the drill rod and the drill bit;

[0012] Threaded engagement can achieve both tightening and torque transmission.

[0013] Preferably, the inner walls of both the upper and lower parts are provided with dense pits;

[0014] The recess is filled with lubricating oil or grease to prevent wear on the outer surface of the drill rod or drill bit, and also to ensure smooth insertion and removal.

[0015] Preferably, the number of limiting grooves and limiting blocks are corresponding, both ranging from 2 to 6;

[0016] An appropriate quantity ensures reliable connections.

[0017] Preferably, markings are engraved on the front side of the positioning plate for easy assembly.

[0018] The present invention, employing the above-described structure, has the following advantages:

[0019] 1. The system consists of a cylinder, sleeve one, sleeve two, and two limiting components. First, the drill rod and sleeve one, as well as the drill bit and sleeve two, are connected. Then, the cylinder is connected to the drill rod and drill bit via screws to form a connecting ring. The rings are interlocked to ensure a firm and reliable connection. The overall structure is simple, efficient, and convenient.

[0020] 2. Different specifications of drill bits can be clamped by adjusting the sleeve with different wall thicknesses. The sleeve wall thickness can be switched arbitrarily, which can adapt to a variety of specifications of drill rods and drill bits, including coarse, fine and medium diameters. It can realize the connection of drill rods and drill bits of the same diameter as well as the connection of drill rods and drill bits of different diameters, and has a wide range of applications.

[0021] 3. The specially designed sleeve has an inwardly recessed lower part that is elastic and can be opened. The sleeve is opened by the outline of the drill rod or drill bit itself, and the limiting block is inserted into the limiting groove, so that the connection and positioning of the drill rod or drill bit and the sleeve are completed in one step.

[0022] 4. By inserting and screwing in the double-ended screw, a reliable connection is formed between the drill rod or drill bit and the cylinder. The operation is simple and easy to implement. Attached Figure Description

[0023] Figure 1 This is a front view full sectional structural diagram of Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the AA cross-section structure of the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the sleeve of the present invention;

[0026] Figure 4 This is a schematic diagram of the main half-section structure of the cylindrical body of the present invention;

[0027] Figure 5 This is a schematic diagram of the front view of the full cross-section structure of Embodiment 2 of the present invention;

[0028] Figure 6 This is a front view full sectional structural diagram of Embodiment 3 of the present invention;

[0029] Figure 7 This is a front view full sectional structural diagram of Embodiment 4 of the present invention.

[0030] In the diagram, 1. Drill rod; 2. Sleeve 1; 21. Positioning plate; 22. Upper part; 23. Limiting block; 24. Lower part; 25. Mark; 26. Recess; 3. Cylinder; 31. Limiting groove; 32. Through hole; 33. Limiting ring; 4. Double-ended screw; 5. Sleeve 2; 6. Drill bit; 7. Nut. Detailed Implementation

[0031] To make the technical means, technical features, inventive purpose and technical effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0032] Example 1: This example can clamp the drill rod 1 and drill bit 6, which have the same diameter but a larger dimension. In other words, it clamps a thicker drill rod 1 and drill bit 6. With the cylinder 3 dimension unchanged, both sleeve 1 (2) and sleeve 2 (5) are thin-walled structures. The drill rod 1 and sleeve 1 (2) have a transition fit, and the drill bit 6 and sleeve 2 (5) have a transition fit. Figure 1 As shown, in this embodiment, the inner diameter of the limiting ring 33 is smaller than the inner diameter of the drill rod 1 and the drill bit 6.

[0033] A drill pipe adapter includes a cylinder 3, a first sleeve 2, a second sleeve 5, and two limiting components. The first sleeve 2 and the second sleeve 5 are detachably fitted inside both ends of the cylinder 3. The length of each sleeve is only a portion of the drill pipe 1 or drill bit 6 inserted into the cylinder 3. The drill pipe 1 is insertably fitted into the first sleeve 2, with the inserted end of the drill pipe 1 abutting against one side of a limiting ring 33. The first sleeve 2 is fixed inside one end of the cylinder 3 by the insertion of the drill pipe 1. The drill bit 6 is insertably fitted into the second sleeve 5, with the second sleeve 5 fixed inside the other end of the cylinder 3 by the insertion of the drill bit 6. Figure 2 As shown, four double-ended screws 4 and four nuts 7 work together to fix the drill rod 1 to one end of the cylinder 3, and four double-ended screws 4 and four nuts 7 work together to fix the drill bit 6 to the other end of the cylinder 3;

[0034] like Figure 4 As shown, the cylinder 3 is a cylindrical structure with open ends. A limiting ring 33 is integrally provided on the inner wall of the middle section of the cylinder 3. Through holes 32 are machined at both ends of the cylinder 3 near the middle section. Four limiting grooves 31 are machined at intervals on the inner wall of both ends of the cylinder 3.

[0035] like Figure 3As shown, sleeve 1 2 and sleeve 2 5 have the same structure. Sleeve 1 2 includes a positioning disk 21, an upper part 22 and a lower part 24 connected in sequence. The positioning disk 21 is annular. The upper part 22 is a cylindrical structure with open ends. One end of the upper part 22 is integrally connected to the positioning disk 21. The other end of the upper part 22 is integrally connected to one end of the lower part 24. The other end of the lower part 24 has four U-shaped notches processed along the axis. The lower part 24 is bent inward and elastic and can be stretched into a cylindrical shape. Four limiting blocks 23 corresponding to the limiting groove 31 are protruded and welded on the outer surface of the lower part 24. The shape, size and number of the limiting groove 31 and the limiting block 23 are all corresponding.

[0036] Working principle:

[0037] First, connect the drill rod 1 end: Fill the recess 26 of sleeve 2 with lubricating oil or grease, insert sleeve 2 into one end of cylinder 3, and make sure that mark 25 is aligned with the top of cylinder 3 when inserting. This will ensure that the limiting block 23 is quickly aligned with the limiting groove 31. When the positioning plate 21 and the end of cylinder 3 are in contact, it means that the insertion is in place. At this time, the lower part 24 of sleeve 2 is naturally bent inward inside cylinder 3, and the limiting block 23 is not inserted into the limiting groove 31. Then, insert the insertion end of drill rod 1 into sleeve 2. As drill rod 1 is inserted, the lower part 24 of sleeve 2 is gradually opened. When drill rod 1 is fully inserted into the lower part 24 of sleeve 2, it is opened into a cylindrical shape. At this time, the limiting block 23 is inserted into the limiting groove 31 to complete the connection and fixation of drill rod 1 and sleeve. Insert one end of double-ended screw 4 into through hole 32 and then screw it into the threaded blind hole on drill rod 1. Tighten the other end of double-ended screw 4 with nut 7.

[0038] Next, connect the drill bit 6 end: Fill the recess 26 of the sleeve 2 5 with lubricating oil or grease, insert the sleeve 2 5 into the other end of the cylinder 3, and make sure that the mark 25 is aligned with the top of the cylinder 3 when inserting it. This will ensure that the limiting block 23 is quickly aligned with the limiting groove 31. When the positioning plate 21 and the other end of the cylinder 3 come into contact, it means that the insertion is in place. At this time, the lower part 24 of the sleeve 2 5 is naturally bent inward inside the cylinder 3, and the limiting block 23 is not inserted into the limiting groove 31. Then insert the insertion end of the drill bit 6 into the sleeve 2 5. As the drill bit 6 is inserted, the lower part 24 of the sleeve 2 5 is gradually opened. When the drill bit 6 is fully inserted into the lower part 24 of the sleeve 2 5, it is opened into a cylindrical shape. At this time, the limiting block 23 is inserted into the limiting groove 31 to complete the connection and fixation of the drill bit 6 and the sleeve. Insert one end of the double-ended screw 4 into the through hole 32 and then screw it into the threaded blind hole on the drill bit 6. Tighten the other end of the double-ended screw 4 with the nut 7.

[0039] At this point, drill bit 6 and drill rod 1 are connected.

[0040] Example 2: This example can clamp drill rod 1 and drill bit 6 with the same diameter but medium dimensions at the insertion end. In other words, it clamps drill rod 1 and drill bit 6 of medium thickness. With the dimensions of the cylinder 3 unchanged, sleeve 1 (2) and sleeve 2 (5) both have medium wall thickness. Drill rod 1 and sleeve 1 (2) have a transition fit, and drill bit 6 and sleeve 2 (5) have a transition fit. Figure 5 As shown, in this embodiment, the inner diameter of the limiting ring 33 is equal to the inner diameter of the drill rod 1 and the drill bit 6.

[0041] The other structures and working principles of this embodiment are the same as those of Embodiment 1.

[0042] Example 3: This example can clamp the drill rod 1 and drill bit 6 with the same diameter but smaller dimensions at the insertion end. In other words, it clamps a thinner drill rod 1 and drill bit 6. With the cylinder 3 dimensions unchanged, both sleeve 2 and sleeve 5 have thicker walls. Figure 6 As shown, in this embodiment, the inner diameter of the limiting ring 33 is larger than the inner diameter of the drill rod 1 and the drill bit 6.

[0043] The other structures and working principles of this embodiment are the same as those of Embodiment 1.

[0044] Example 4: This example can clamp drill rod 1 and drill bit 6 with different diameters. In this example, "coarse" and "thin" are relative, that is, to ensure that drill rod 1 and drill bit 6 can be used in normal cooperation. Drill rod 1 and sleeve 1 2 are transitional fits, and drill bit 6 and sleeve 2 5 are transitional fits.

[0045] This embodiment may have many possible scenarios, such as: Figure 7 As shown, the drill rod 1 has a larger diameter and the drill bit 6 has a smaller diameter, meaning that the drill rod 1 is thicker and the drill bit 6 is thinner. With the size of the cylinder 3 remaining unchanged, the sleeve 1 2 has a thin-walled structure and the sleeve 2 5 has a thicker wall.

[0046] For example: the diameter of drill rod 1 is smaller and the diameter of drill bit 6 is larger, that is, the thinner drill rod 1 and the thicker drill bit 6 are clamped. Under the condition that the size of cylinder 3 remains unchanged, the wall thickness of sleeve 1 2 is thicker and sleeve 2 5 is a thin-walled structure.

[0047] For example: Drill rod 1 has a medium diameter, and drill bit 6 has a small diameter, which means that it holds a medium-thickness drill rod 1 and a thinner drill bit 6. With the size of cylinder 3 unchanged, sleeve 1 2 has a medium wall thickness, and sleeve 2 5 has a thicker wall.

[0048] For example: the drill rod 1 has a smaller diameter and the drill bit 6 has a medium diameter, which means that the drill rod 1 is thinner and the drill bit 6 is of medium thickness. With the size of the cylinder 3 unchanged, the sleeve 1 2 has a thicker wall and the sleeve 2 5 has a medium wall thickness.

[0049] For example: the drill rod 1 has a larger diameter and the drill bit 6 has a medium diameter, which means that the drill rod 1 is thicker and the drill bit 6 is of medium thickness. With the size of the cylinder 3 unchanged, the sleeve 1 2 has a thin wall structure and the sleeve 2 5 has a medium wall thickness.

[0050] For example: the drill rod 1 has a medium diameter and the drill bit 6 has a large diameter, which means that the drill rod 1 with a medium thickness and the drill bit 6 with a large thickness are clamped. Under the condition that the size of the cylinder 3 remains unchanged, the sleeve 1 2 has a medium wall thickness and the sleeve 2 5 has a thin wall structure.

[0051] The other structures and working principles of this embodiment are the same as those of Embodiment 1.

[0052] It should be noted that the aforementioned double-ended screw 4, nut 7, lubricating oil, and lubricating grease are all applications of existing technology.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the claims of this invention should fall within the technical scope of this invention.

Claims

1. A drill pipe variable head, characterized in that: Includes a cylinder (3), a first sleeve (2), a second sleeve (5), and two limiting components. The first sleeve (2) and the second sleeve (5) are detachably fitted inside both ends of the cylinder (3). The drill rod (1) is inserted and detachably fitted in the first sleeve (2). The first sleeve (2) is fixed inside one end of the cylinder (3) by the insertion of the drill rod (1). The drill bit (6) is inserted and detachably fitted in the second sleeve (5). The second sleeve (5) is fixed inside the other end of the cylinder (3) by the insertion of the drill bit (6). One of the limiting components fixes the drill rod (1) and one end of the cylinder (3), and the other limiting component fixes the drill bit (6) and the other end of the cylinder (3). The cylinder (3) is a cylindrical structure with open ends. A limiting ring (33) is provided on the inner wall of the middle section of the cylinder (3). Through holes (32) are provided at both ends of the cylinder (3) near the middle section. Multiple limiting grooves (31) are provided at intervals on the inner walls of both ends of the cylinder (3). The first sleeve (2) and the second sleeve (5) have the same structure. The first sleeve (2) includes a positioning disk (21), an upper part (22) and a lower part (24) arranged in sequence. The positioning disk (21) is annular. The upper part (22) is a cylindrical structure with open ends. One end of the upper part (22) is integrally connected with the positioning disk (21). The other end of the upper part (22) is integrally set with one end of the lower part (24). The other end of the lower part (24) is provided with multiple U-shaped notches along the axis. The lower part (24) is bent inward and elastic and can be stretched into a cylindrical shape. Multiple limiting blocks (23) corresponding to the limiting groove (31) are protruding on the outer surface of the lower part (24).

2. A drill pipe variable head according to claim 1, characterized in that: The limiting assembly includes multiple double-ended screws (4) and multiple nuts (7). Multiple threaded blind holes corresponding to the double-ended screws (4) are provided at intervals along the outer surface of both the drill rod (1) and the drill bit (6).

3. A drill pipe variable head according to claim 1, characterized in that: The inner walls of the upper part (22) and the lower part (24) are provided with dense pits (26).

4. A drill pipe variable head according to claim 3, characterized in that: The number of the limiting grooves (31) and the limiting blocks (23) are corresponding, both being 2 to 6.

5. A drill pipe variable head according to claim 4, characterized in that: The positioning disk (21) has a mark (25) engraved on its front side.

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