Drill pipe joint welding end face machining mechanism

Abstract

This utility model relates to the field of machining equipment technology and discloses a machining mechanism for the welded end face of a drill pipe joint. It includes a base, a three-jaw chuck, a clamping mechanism, and a cutting mechanism. The clamping mechanism includes a bidirectional threaded rod driven by a clamping knob and a clamping block threaded onto the bidirectional threaded rod. The clamping mechanism is threadedly engaged with an adjusting screw through a connecting block. The cutting mechanism includes a mounting block and a cutting tool fixed to the mounting block by bolts. The mounting block is threadedly engaged with an adjusting screw. The cutting mechanism is also threadedly engaged with another adjusting screw through a connecting block. This utility model, by setting a clamping mechanism that engages with the three-jaw chuck and can move along the workpiece axially, supports the middle part of the drill pipe joint, achieving double stable fixation of the workpiece, effectively suppressing runout during machining, and improving machining accuracy.

Description

Technical Field

[0001] This utility model relates to the field of machining equipment technology, and in particular to a machining mechanism for the welding end face of drill pipe joints. Background Technology

[0002] Drill pipe joints are key connecting components in fields such as oil drilling. The machining quality of the drill pipe joint end face directly affects the overall connection strength and sealing performance of the drill string. Especially during welding repair or manufacturing, the welded end face of the drill pipe joint needs to be precisely machined to ensure flatness and dimensional accuracy.

[0003] In existing machining practices, general-purpose lathes are usually used to machine drill pipe joints. However, drill pipe joints usually have a large length-to-diameter ratio and are typical slender shaft workpieces. Due to their insufficient rigidity, when the end face is turned using a cantilever clamping method with one end held by a chuck, the suspended part of the workpiece will bend and vibrate under the combined action of cutting force and its own weight, resulting in obvious machining runout.

[0004] This kind of unstable fluctuation during the processing will directly lead to quality defects such as large flatness error, high surface roughness value and difficulty in guaranteeing dimensional accuracy on the processed end face. Not only will it fail to meet the requirements of high-quality connection, but it will also affect the subsequent welding quality and reduce production efficiency and product qualification rate.

[0005] Therefore, this utility model proposes a machining mechanism for the welding end face of drill pipe joints to address the shortcomings of existing technologies. Utility Model Content

[0006] In view of the problems of poor processing stability and low precision caused by the existing drilling pipe joint welding end face machining mechanism, which only clamps the end of the workpiece, and is difficult to adapt to the processing requirements of workpieces of different specifications, this utility model aims to provide a drilling pipe joint welding end face machining mechanism with improved structure that can effectively solve the above problems.

[0007] This utility model provides a machining mechanism for the welding end face of a drill pipe joint, including: a base, a three-jaw chuck, a clamping mechanism, and a cutting mechanism; The clamping mechanism includes a bidirectional threaded rod driven by a clamping knob, a clamping block, a connecting block one, an adjusting screw one, and an adjusting knob one; the cutting mechanism includes a mounting block, a bolt, a cutting tool, an adjusting knob two, an adjusting screw two, and a connecting block two; the machining mechanism for the welded end face of the drill pipe joint also includes a guide rod and a fixing block. Furthermore, the clamping mechanism is threadedly engaged with the adjusting screw through a connecting block one, the cutting mechanism is threadedly engaged with another adjusting screw through a connecting block two, the clamping block is threadedly connected to the bidirectional threaded rod, the cutting tool is fixed to the mounting block by bolts, the mounting block is threadedly engaged with the adjusting screw two, the connecting block one and the connecting block two are both slidably sleeved on the guide rod, and the adjusting screw one and the guide rod are both supported by a fixing block installed on the base.

[0008] Preferably, rollers are provided on the inner wall of the clamping block facing the workpiece.

[0009] Preferably, the cutting mechanism further includes a limiting box, and the second adjusting knob and the second adjusting lead screw are both mounted on the limiting box.

[0010] Preferably, the machining mechanism for the welded end face of the drill pipe joint includes two adjusting screws and an adjusting knob, which are used to independently drive the clamping mechanism and the cutting mechanism to move axially along the guide rod.

[0011] Preferably, the bidirectional threaded rod has two sections of thread with opposite directions of rotation, and the two sections of thread respectively engage with the two clamping blocks to enable the two clamping blocks to move synchronously towards or away from each other.

[0012] Preferably, the cutting tool is detachably fixed to the mounting block by the bolt. Preferably, the fixing blocks are located at both ends of the base, and are used to rotatably support the adjusting screw and fix the guide rod, respectively.

[0013] Preferably, the first adjusting knob is coaxially and fixedly connected to the end of the first adjusting screw, and the clamping knob is coaxially and fixedly connected to the end of the bidirectional threaded rod.

[0014] This utility model has the following beneficial effects: 1. This utility model, by setting a clamping mechanism that cooperates with a three-jaw chuck, can move along the axial direction of the drill pipe joint and use two clamping blocks driven by a bidirectional threaded rod to support the middle part of the drill pipe joint. This solves the problem in the prior art that the workpiece is not rigid enough and will run and vibrate during processing because it is only clamped at the end. The drill pipe joint is doubly stabilized and fixed, effectively suppressing the running phenomenon during processing, thereby significantly improving the processing accuracy and end face quality.

[0015] 2. This utility model solves the technical problems of existing processing devices, such as fixed structure, inconvenient adjustment, difficulty in adapting to drill rod joints of different lengths and specifications, and low tool positioning accuracy, by setting an adjusting screw that can be independently driven to move axially for the clamping mechanism and the cutting mechanism, and setting another adjusting screw that can drive the cutting tool in the cutting mechanism to move radially. Attached Figure Description

[0016] Figure 1 This is a perspective view of the machining mechanism for the welding end face of the drill pipe joint proposed in this utility model. Figure 2 This is a front view of the machining mechanism for the welding end face of the drill pipe joint proposed in this utility model; Figure 3 This is a side view of the machining mechanism for the welding end face of the drill pipe joint proposed in this utility model; Figure 4 This is a partial structural exploded view of the clamping mechanism of the drilling pipe joint welding end face machining mechanism proposed in this utility model.

[0017] Legend: 1. Base; 2. Clamping mechanism; 21. Adjusting screw one; 22. Fixing block; 23. Adjusting knob one; 24. Connecting block one; 25. Bidirectional threaded rod; 26. Clamping knob; 27. Clamping block; 28. Roller; 29. ​​Guide rod; 3. Cutting mechanism; 31. Connecting block two; 32. Limit box; 33. Adjusting screw two; 34. Adjusting knob two; 35. Mounting block; 36. Bolt; 37. Cutting tool; 4. Three-jaw chuck. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] Example: Please refer to Figures 1 to 4This utility model provides a machining mechanism for the welded end face of a drill pipe joint, including a base 1, a three-jaw chuck 4 mounted on one end of the base 1, and a clamping mechanism 2 and a cutting mechanism 3 movably mounted on the base 1. The base 1 serves as the mounting platform for the entire device, supporting and connecting various components. The clamping mechanism 2 and the three-jaw chuck 4 cooperate to provide double stable clamping for the drill pipe joint. The cutting mechanism 3 is used to perform end face machining on the rotating drill pipe joint. To achieve precise movement and positioning of the clamping mechanism 2 and the cutting mechanism 3, fixed blocks 22 are respectively mounted at both ends of the base 1. A guide rod 29 and two adjusting screws 21 are parallelly mounted between the two fixed blocks 22. The fixed blocks 22 provide fixed support for the guide rod 29 and also provide support for the two adjusting screws 21. The clamping mechanism 2 is provided with a rotating support. Each adjusting screw 21 has a coaxially fixed adjusting knob 23 at its end for easy operation. The clamping mechanism 2 is slidably sleeved on the guide rod 29 via a connecting block 24. The connecting block 24 is threadedly engaged with one of the adjusting screws 21. Rotating the corresponding adjusting knob 23 can drive the connecting block 24 to move smoothly along the axial direction of the guide rod 29, thereby adjusting the overall position of the clamping mechanism 2. Similarly, the cutting mechanism 3 is slidably sleeved on the guide rod 29 via a connecting block 31. The connecting block 31 is threadedly engaged with another adjusting screw 21. Rotating the other adjusting knob 23 can drive the connecting block 31 to move along the axial direction of the guide rod 29, thereby adjusting the overall axial position of the cutting mechanism 3.

[0020] Please refer to Figure 1 , Figure 2 and Figure 4 The clamping mechanism 2 includes a main body that is threadedly connected to the adjusting screw 21 via a connecting block 24. The main body includes a bidirectional threaded rod 25 driven by a clamping knob 26, and two clamping blocks 27 threaded onto the bidirectional threaded rod 25. The end of the clamping knob 26 is coaxially and fixedly connected to the end of the bidirectional threaded rod 25. The bidirectional threaded rod 25 has two threads with opposite directions of rotation, and the two clamping blocks 27 are respectively engaged with the two threads. When the operator rotates the clamping knob 26, the bidirectional threaded rod 25 rotates accordingly, driving the two clamping blocks 27 bidirectionally. The axes of the threaded rods 25 move synchronously towards or away from each other, thereby enabling rapid clamping or loosening of the middle part of drill rod joints of different diameters. To ensure that the clamped drill rod joints are not jammed or worn by the clamping blocks 27 during rotation, each clamping block 27 is rotatably connected to the inner wall facing the workpiece with rollers 28. When the workpiece rotates, the rollers 28 can roll freely with the workpiece surface, providing stable radial support without affecting the rotational movement of the workpiece. This clamping method, combined with the fixation of the end of the workpiece by the three-jaw chuck 4, forms a double fixation, which improves the rigidity and stability of slender workpieces during processing.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, the cutting mechanism 3 includes a limiting box 32, and an adjusting knob 2 34 and an adjusting screw 2 33, both mounted on the limiting box 32. The end of the adjusting knob 2 34 is coaxially and fixedly connected to the end of the adjusting screw 2 33. The cutting mechanism 3 also includes a mounting block 35 for mounting the cutting tool 37. The mounting block 35 is threadedly engaged with the adjusting screw 2 33 and is slidably connected inside the limiting box 32. When the adjusting knob 2 34 is rotated, the adjusting screw 2 33 rotates and drives the mounting block 35 to move smoothly in a straight line within the limiting box 32 in a direction perpendicular to the axis of the guide rod 29 through thread transmission, thereby accurately adjusting the cutting depth of the cutting tool 37. The cutting tool 37 is detachably fixed to the front end of the mounting block 35 by bolts 36, which facilitates replacement or re-grinding according to processing requirements. Through the coordinated operation of the two adjusting knobs 1 23 and 2 34, the cutting tool 37 can be accurately positioned in both axial and radial dimensions.

[0022] As a preferred embodiment, in order to clamp and support the drill pipe joint while avoiding obstructing its rotational movement, please refer to... Figure 4 Rollers 28 are rotatably mounted on the inner wall of the clamping block 27 facing the workpiece. When the drill pipe joint is clamped by the clamping block 27 and driven to rotate by the three-jaw chuck 4, the surface of the rollers 28 forms rolling contact with the surface of the drill pipe joint, thereby providing stable radial support for the drill pipe joint with minimal frictional resistance.

[0023] As another preferred embodiment, in order to clearly define the radial adjustment range of the cutting mechanism 3 and provide structural support for the adjustment assembly, please refer to... Figure 1 and Figure 2 The cutting mechanism 3 also includes a limit box 32, an adjusting screw 33 and an adjusting knob 34 coaxially fixedly connected thereto, all mounted on the limit box 32. The mounting block 35 is slidably housed in the internal cavity of the limit box 32. The structure of the limit box 32 limits the movement trajectory and travel range of the mounting block 35.

[0024] As a more specific implementation, in order to achieve independent control of the axial positions of the clamping mechanism 2 and the cutting mechanism 3, please refer to... Figure 1 and Figure 2 The device is equipped with two adjusting screws 21 and adjusting knobs 23 with the same structure and function. One adjusting screw 21 is threadedly engaged with the connecting block 24 and is used to drive the clamping mechanism 2 to move axially along the guide rod 29. The other adjusting screw 21 is threadedly engaged with the connecting block 31 and is used to drive the cutting mechanism 3 to move axially along the guide rod 29. The two can be operated independently and do not interfere with each other.

[0025] As a preferred embodiment, to achieve synchronous centering and clamping of the clamping blocks 27, please refer to... Figure 4 The bidirectional threaded rod 25 has two threads with opposite directions on its body. The internal threaded holes on the two clamping blocks 27 are respectively threaded with the two threads of the bidirectional threaded rod 25. When the bidirectional threaded rod 25 rotates, the two clamping blocks 27 can move towards each other at the same speed to clamp the workpiece, or move away from each other to release the workpiece.

[0026] For ease of maintenance and replacement, please refer to [the relevant documentation / reference]. Figure 2 The cutting tool 37 is detachably fixed to the mounting block 35 by bolts 36. When the cutting tool 37 is worn or needs to be replaced with a different type of tool, the disassembly and assembly can be completed quickly by simply loosening the bolts 36.

[0027] As one method to enhance structural stability, please refer to... Figure 2 and Figure 3 The fixing block 22 is specifically located at both ends of the base 1. It is used to rotatably support the ends of the two adjusting screws 21 and fix the ends of the guide rod 29, providing a stable and reliable guide rail reference for the moving parts.

[0028] Working principle: Before machining the drill pipe joint, first loosen the clamping mechanism 2 and the three-jaw chuck 4, place the drill pipe joint on the device, and activate the three-jaw chuck 4 to clamp the end of the drill pipe joint. Then, according to the total length of the drill pipe joint, rotate the adjusting knob 23 located on the left side of the base 1. The adjusting knob 23 drives the adjusting screw 21, which is coaxially fixedly connected to it, to rotate. Since the adjusting screw 21 and the connecting block 24 are threadedly engaged, and the connecting block 24 is slidably sleeved on the guide rod 29, the rotation of the adjusting screw 21... The rotation will drive the entire clamping mechanism 2 to move smoothly along the axial direction of the guide rod 29 to the middle position of the drill pipe joint. Then, the clamping knob 26 is rotated, which drives the bidirectional threaded rod 25 to rotate, thereby driving the two clamping blocks 27 to move synchronously towards each other until the rollers 28 on the inner wall of the clamping blocks 27 press against and support the middle of the drill pipe joint. Thus, through the synergistic action of the three-jaw chuck 4 and the clamping mechanism 2, the double-stable fixation of the drill pipe joint is completed, effectively suppressing the jumping and vibration of the workpiece during subsequent rotational processing. During the tool adjustment stage, rotate the adjustment knob 23 located on the right side of the base 1. Through the threaded transmission between the adjustment screw 21 and the connecting block 31, the entire cutting mechanism 3 moves axially along the guide rod 29, roughly aligning the cutting tool 37 with the welding end face of the drill pipe joint. Then, rotate the adjustment knob 34 on the outside of the limit box 32. Through the threaded transmission between the adjustment screw 33 and the mounting block 35, drive the mounting block 35 and the cutting tool 37 to make precise feed or retraction in the radial direction to set the required cutting depth. After all positions are adjusted, start the three-jaw chuck 4 to drive the drill pipe joint to rotate at high speed. The rotating drill pipe joint end face contacts the statically fixed cutting tool 37, thus achieving smooth and precise end face turning.

Claims

1. A machining mechanism for the welding end face of a drill pipe joint, comprising a base (1), a three-jaw chuck (4) mounted on one end of the base (1), and a clamping mechanism (2) and a cutting mechanism (3) disposed on the base (1); Its features are, The clamping mechanism (2) includes a bidirectional threaded rod (25) driven by a clamping knob (26). The bidirectional threaded rod (25) is threadedly connected to two clamping blocks (27). The clamping mechanism (2) is threadedly engaged with an adjusting screw (21) via a connecting block (24). The adjusting screw (21) is driven by an adjusting knob (23) to adjust the axial position of the clamping mechanism (2). The cutting mechanism (3) includes a mounting block (35). A cutting tool (37) is fixed on the mounting block (35) by bolts (36). The mounting block (35) is threadedly engaged with an adjusting screw (33) driven by an adjusting knob (34) to adjust the radial position of the cutting tool (37). The cutting mechanism (3) is threadedly engaged with another adjusting screw (21) via a connecting block (31).

2. The drilling pipe joint welding end face machining mechanism according to claim 1, characterized in that, The base (1) is also provided with a guide rod (29), and the first connecting block (24) and the second connecting block (31) are slidably sleeved on the guide rod (29). The first adjusting screw (21) and the guide rod (29) are both supported by a fixing block (22) installed on the base (1).

3. The drilling pipe joint welding end face machining mechanism according to claim 1, characterized in that, The clamping block (27) has rollers (28) on its inner wall facing the workpiece.

4. The drilling pipe joint welding end face machining mechanism according to claim 1, characterized in that, The cutting mechanism (3) also includes a limiting box (32), and the second adjusting knob (34) and the second adjusting screw (33) are both installed on the limiting box (32).

5. The drilling pipe joint welding end face machining mechanism according to claim 2, characterized in that, There are two adjusting screws (21) and one adjusting knob (23), which are used to independently drive the clamping mechanism (2) and the cutting mechanism (3) to move along the axial direction of the guide rod (29).

6. The drilling pipe joint welding end face machining mechanism according to claim 1, characterized in that, The bidirectional threaded rod (25) has two threads with opposite directions of rotation. The two threads are respectively threaded into the two clamping blocks (27) so that the two clamping blocks (27) move synchronously towards or away from each other.

7. The drilling pipe joint welding end face machining mechanism according to claim 1, characterized in that, The cutting tool (37) is detachably fixed to the mounting block (35) by the bolt (36).

8. The drilling pipe joint welding end face machining mechanism according to claim 2, characterized in that, The fixing blocks (22) are located at both ends of the base (1) and are used to rotatably support the adjusting screw (21) and fix the guide rod (29), respectively.

9. The drilling pipe joint welding end face machining mechanism according to claim 1, characterized in that, The adjusting knob (23) is coaxially fixedly connected to the end of the adjusting screw (21), and the clamping knob (26) is coaxially fixedly connected to the end of the bidirectional threaded rod (25).

Images