Automatic tightening device for drilling rod joint milling

Abstract

This application relates to an automatic tightening device for milling the outer diameter of a drill pipe joint, belonging to the technical field of drill pipe joint processing. It includes a worktable with a turntable rotatably mounted on it. The turntable is horizontally positioned and rotates relative to the worktable. Multiple inner support plates are slidably mounted on the top surface of the turntable, with adjacent inner support plates distributed at equal central angle intervals along the center of the turntable. All inner support plates slide simultaneously near or away from the center of the turntable. The turntable is equipped with a fastening assembly for driving all inner support plates to move simultaneously. This application achieves the effect of ensuring that the clamping of the drill pipe joint by the fixture and the milling of the outer diameter of the drill pipe joint do not interfere with each other.

Description

Technical Field

[0001] This application relates to the technical field of drill pipe joint processing, and in particular to an automatic tightening device for milling the outer diameter of a drill pipe joint. Background Technology

[0002] Milling the outer diameter of a drill pipe joint is a machining process primarily used to machine the outer circular surface of the drill pipe joint to achieve specific dimensional, precision, and surface quality requirements. The drill pipe joint is a crucial component connecting the drill pipe and is typically made of high-strength alloy steel. During drilling, the drill pipe joint needs to withstand enormous torque, tension, and pressure; therefore, its quality and performance directly affect the safety and efficiency of drilling operations.

[0003] Milling the outer diameter is typically done using a milling machine. The operator secures the drill pipe connector to the milling machine's worktable using fixtures. By adjusting the milling machine's cutting tools and parameters, such as cutting speed, feed rate, and depth of cut, the tool is guided to cut along the outer diameter of the drill pipe connector. The distance between the fixtures is shortened to clamp the drill pipe connector located between them.

[0004] Drill pipe joints come in various sizes, ranging from long to short. When the clamp is held on the outer wall of the drill pipe joint, there is a defect where the clamp covers the outer wall of the drill pipe joint, thus affecting the milling of the outer diameter. Utility Model Content

[0005] In order to prevent the clamping of the drill pipe joint by the fixture from affecting the two actions of milling the outer diameter of the drill pipe joint, this application provides an automatic tightening device for milling the outer diameter of the drill pipe joint.

[0006] The automatic tightening device for milling the outer diameter of a drill pipe joint provided in this application adopts the following technical solution:

[0007] An automatic tightening device for milling the outer diameter of a drill pipe joint includes a worktable, on which a turntable is rotatably mounted. The turntable is horizontally positioned and rotates relative to the worktable. Multiple inner support plates are slidably mounted on the top surface of the turntable. Adjacent inner support plates are distributed at equal central angle intervals along the center of the turntable. All inner support plates slide simultaneously along a point close to or away from the center of the turntable. The turntable is equipped with a fastening assembly for driving all inner support plates to move simultaneously.

[0008] By adopting the above technical solution, when the drill pipe joint needs to be clamped, the fastening assembly drives all the inner support plates to move simultaneously away from the center of the turntable. The inner support plates are pushed outward from the inside of the drill pipe joint, thereby achieving the internal support and fixation of the drill pipe joint. This internal support clamping method avoids the problem of the fixture covering the outer wall of the drill pipe joint, so that the milling of the outer circle can be carried out smoothly. It effectively solves the defect of the fixture affecting the milling of the outer circle and ensures the machining accuracy and efficiency of the drill pipe joint milling of the outer circle.

[0009] Optionally, the fastening assembly includes a screw, a positioning tube, a movable cylinder, and a connecting rod. The vertical center lines of the screw, positioning tube, movable cylinder, and turntable are collinear. The bottom end of the positioning tube is fixed at the center of the top surface of the turntable. The movable cylinder is upside down on the top of the positioning tube and slides vertically relative to the positioning tube. One end of the connecting rod is hinged to the outer wall of the movable cylinder, and the other end is hinged to the inner support plate. The hinge shafts at both ends of the connecting rod are horizontally positioned. The top end of the screw passes through the center of the turntable and the positioning tube and is rotatably connected to the inner wall of the top of the movable cylinder. The screw rotates relative to the movable cylinder and is threadedly connected to the inner wall of the positioning tube. A sliding hole is provided on the turntable, which is opened along the radius of the turntable. The inner support plate slides along the length of the sliding hole.

[0010] By adopting the above technical solution, when it is necessary to clamp the drill pipe joint, rotating the screw will cause it to move vertically due to the threaded connection between the screw and the inner wall of the positioning tube. The screw drives the movable cylinder to slide up and down along the positioning tube, and the movable cylinder, through a connecting rod, drives the inner support plate to slide along the sliding hole towards or away from the center of the turntable. The inner support plate expands outward from the inside of the drill pipe joint, thereby achieving internal support and fixation of the drill pipe joint.

[0011] Optionally, the bottom surface of the workbench is provided with a limit rod and a first motor. The limit rod is vertically arranged and one end is fixedly connected to the housing of the first motor. The other end passes through the turntable and is inserted into the wall thickness of the positioning tube. The limit rod is slidably arranged in the vertical direction. The output end of the first motor is fixedly connected to the bottom end of the screw.

[0012] By adopting the above technical solution, after the first motor starts, it drives the screw to rotate. The limiting rod restricts the radial movement of the screw, allowing it to move only vertically up and down. In this way, the screw, through its threaded engagement with the positioning tube, converts the rotational motion into the vertical linear motion of the movable cylinder, which in turn drives the connecting rod to move the inner support plate synchronously, achieving automatic tightening and loosening of the drill pipe joint. The design of the first motor and the limiting rod ensures the stability and reliability of the fastening assembly, ensuring that the inner support plate can accurately position and apply force when clamping the drill pipe joint, thus improving the working efficiency and clamping effect of the automatic tightening device.

[0013] Optionally, a second motor is fixed on the worktable, a gear is fixed at the output end of the second motor, and a gear ring is fixed on the circumferential outer wall of the turntable, with the gear meshing with the gear ring.

[0014] By adopting the above technical solution, when the second motor is working, the gear at its output end rotates and meshes with the gear ring, causing the turntable to rotate relative to the worktable. This allows the drill pipe joint, after being fixed by the inner support plate, to rotate together with the turntable, facilitating milling of the drill pipe joint's outer diameter by the milling machine cutter in all directions.

[0015] Optionally, the inner support plate is L-shaped to support the end face of one end of the drill pipe joint.

[0016] By adopting the above technical solution, the L-shaped inner support plate can effectively support the end face of one end of the drill pipe joint. When the drill pipe joint is opened from the inside, it not only provides stable support force but also effectively prevents axial movement of the drill pipe joint during processing. This structural design allows the drill pipe joint to maintain a stable posture after being clamped, ensuring the accuracy and quality of milling the outer diameter. It is especially suitable for drill pipe joints of different sizes and shapes, enhancing the versatility and practicality of the automatic tightening device.

[0017] Optionally, the inner support plate has anti-slip textured surfaces on its sidewall facing away from the vertical center line of the turntable.

[0018] By adopting the above technical solution, the anti-slip texture increases the friction between the inner support plate and the inner wall of the drill pipe joint, enabling the inner support plate to clamp the drill pipe joint more firmly. When the drill pipe joint is milled on its outer diameter as the turntable rotates, even under significant cutting forces and torques, slippage on the inner support plate is effectively prevented, ensuring the safety and stability of the machining process and further improving the machining quality and efficiency of the drill pipe joint's outer diameter milling.

[0019] Optionally, ribs are fixed on the outer wall of the movable cylinder, the ribs are arranged along the length of the movable cylinder, and the number of ribs corresponds to the number of inner support plates; the hinge point between one end of the connecting rod and the outer wall of the movable cylinder is located on the rib.

[0020] By adopting the above technical solution, the ribs enhance the structural strength of the movable cylinder and provide a more stable hinge point for the connecting rod. During the movement of the inner support plate driven by the connecting rod through the movable cylinder, the ribs can better transmit force, preventing deformation of the movable cylinder due to uneven force distribution and ensuring that the inner support plate moves synchronously and stably, thereby achieving uniform and reliable clamping of the drill pipe joint. The design of corresponding numbers of ribs and inner support plates ensures the balance of force on the entire fastening assembly, improving the service life and performance of the automatic tightening device.

[0021] Optionally, a slider is fixed on the inner support plate. The slider is inserted into the sliding hole and slides along the sliding length direction. The slider has a dovetail-shaped cross section, and the cross section inside the sliding hole is adapted to the slider.

[0022] By adopting the above technical solution, the dovetail-shaped slider is adapted to the sliding hole. This structural design effectively restricts the radial movement of the inner support plate during the sliding process, allowing it to slide only along the length of the sliding hole, thus ensuring the linearity and stability of the inner support plate's movement. Simultaneously, the dovetail structure can withstand significant lateral forces. When clamping the drill pipe joint, even under substantial external force, the inner support plate will not detach from the sliding hole, enhancing the structural strength and reliability of the automatic tightening device and ensuring the smooth milling of the drill pipe joint's outer diameter.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The internal support clamping prevents the clamp from covering the outer wall of the drill pipe joint, thus preventing interference with the milling of the outer diameter.

[0025] 2. The first motor drives the screw to automatically tighten and loosen the inner support plate, and the second motor, through the cooperation of gears and gear rings, makes the drill rod joint rotate automatically with the turntable. There is no need for manual adjustment of the drill rod joint position, which greatly improves the automation level of milling the outer circle and reduces the labor intensity of operators.

[0026] 3. The L-shaped inner support plate supports the end face of the drill pipe joint and prevents axial movement. The dovetail-shaped slider ensures stable movement of the inner support plate. These designs together ensure that the drill pipe joint maintains a stable posture during machining, thereby improving the machining accuracy of the outer circle. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0028] Figure 2 This is a front view of an embodiment of this application;

[0029] Figure 3 This is a vertical sectional view of an embodiment of this application.

[0030] In the diagram, 1. Workbench; 11. First motor; 12. Limiting rod; 13. Second motor; 14. Gear; 15. Gear ring; 2. Turntable; 21. Sliding hole; 3. Inner support plate; 31. Anti-slip texture; 32. Slider; 4. Fastening assembly; 41. Screw; 42. Positioning tube; 43. Movable cylinder; 44. Connecting rod; 5. Rib. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0032] This application discloses an automatic tightening device for milling the outer diameter of a drill pipe joint.

[0033] refer to Figure 1 An automatic tightening device for milling the outer diameter of a drill pipe joint includes a worktable 1. The worktable 1 serves as the basic load-bearing component of the entire device, providing a platform for the installation and operation of other components. At the center of the top surface of the worktable 1, a turntable 2 is rotatably mounted via a bearing or other rotating connection structure. The turntable 2 is horizontal and can rotate relative to the worktable 1.

[0034] refer to Figure 2 and Figure 3The top surface of the turntable 2 has multiple sliding holes 21 extending radially. Multiple inner support plates 3 are slidably disposed within the sliding holes 21. Adjacent inner support plates 3 are distributed at equal central angles along the center of the turntable 2. This layout ensures a uniform distribution of clamping force on the drill pipe joint. In this embodiment, four inner support plates 3 are provided. All inner support plates 3 can slide simultaneously near or away from the center of the turntable 2, and the turntable 2 is provided with fastening components 4 for driving all inner support plates 3 to move simultaneously.

[0035] refer to Figure 3 The fastening assembly 4 includes a screw 41, a positioning tube 42, a movable cylinder 43, and a connecting rod 44. The screw 41, positioning tube 42, movable cylinder 43, and turntable 2 are all collinear. The bottom end of the positioning tube 42 is fixed to the center of the top surface of the turntable 2 by welding or other fixing methods. The movable cylinder 43 is inverted on top of the positioning tube 42, and a guide structure, such as a guide groove and guide block, can be provided between the movable cylinder 43 and the positioning tube 42 to allow the movable cylinder 43 to slide stably relative to the positioning tube 42 in the vertical direction. One end of the connecting rod 44 is hinged to the outer wall of the movable cylinder 43, and the other end is hinged to the inner support plate 3. The hinge shafts at both ends of the connecting rod 44 are horizontally positioned. The top end of the screw 41 passes through the center of the turntable 2 and the positioning tube 42, and is rotatably connected to the inner wall of the top of the movable cylinder 43 through a bearing or other structure. The screw 41 can rotate relative to the movable cylinder 43, and is also connected to the inner wall of the positioning tube 42 by a threaded connection.

[0036] refer to Figure 2 and 3 On the bottom surface of the workbench 1, a limit rod 12 and a first motor 11 are fixedly installed. The limit rod 12 is vertically arranged, with one end fixedly connected to the housing of the first motor 11 by welding or other means, and the other end penetrating the turntable 2 and inserting into the wall thickness of the positioning tube 42. A sliding fit structure is provided between the limit rod 12, the turntable 2, and the positioning tube 42, so that the limit rod 12 can only slide in the vertical direction. This sliding fit structure refers to the insertion hole in the positioning tube 42 and the through hole in the turntable 2. The output end of the first motor 11 is fixedly connected to the bottom end of the screw 41 through a coupling or other transmission components.

[0037] refer to Figure 2 and 3 A second motor 13 is also fixedly installed on the workbench 1. A gear 14 is fixed to the output end of the second motor 13. A gear ring 15 is fixed to the circumferential outer wall of the turntable 2. The gear 14 and the gear ring 15 mesh with each other.

[0038] refer to Figure 1The inner support plate 3 has an L-shaped structure, and its horizontal part is used to support the end face of one end of the drill pipe joint. This design can provide stable support force and prevent the drill pipe joint from axially moving during processing. In addition, anti-slip texture 31 is provided on the side wall of the inner support plate 3 away from the vertical center line of the turntable 2 to increase the friction between it and the inner wall of the drill pipe joint and ensure the firmness of the clamping.

[0039] refer to Figure 2 and 3 Ribs 5 are fixed to the outer wall of the movable cylinder 43 by welding or other means. The ribs 5 are arranged along the length of the movable cylinder 43. The number of ribs 5 corresponds to the number of inner support plates 3. The hinge point of one end of the connecting rod 44 to the outer wall of the movable cylinder 43 is located on the rib 5, thereby enhancing the structural strength and force transmission stability of the movable cylinder 43.

[0040] refer to Figure 1 and 3 A slider 32 is fixed on the inner support plate 3. The cross-section of the slider 32 is dovetail-shaped (not shown in the dovetail shape diagram). The inner cross-section of the sliding hole 21 is adapted to the slider 32. The slider 32 is inserted into the sliding hole 21 and can slide along the sliding length direction of the sliding hole 21. This dovetail-shaped fitting structure can effectively limit the radial movement of the inner support plate 3 during the sliding process, ensure the linearity and stability of the movement of the inner support plate 3, and improve the structural strength of the device.

[0041] The implementation principle of the automatic tightening device for milling the outer diameter of a drill pipe joint according to an embodiment of this application is as follows: When the drill pipe joint needs to be processed, the drill pipe joint is first placed on the turntable 2, so that one end of the drill pipe joint is fitted onto the outside of the inner support plate 3. The first motor 11 is started, and the first motor 11 drives the screw 41 to rotate. Since the limit rod 12 restricts the radial movement of the screw 41, the screw 41 moves upward in the vertical direction under the threaded engagement with the positioning tube 42, thereby driving the movable cylinder 43 to slide upward along the positioning tube 42. The movable cylinder 43 drives the inner support plate 3 to slide along the sliding hole 21 away from the center of the turntable 2 through the connecting rod 44. The inner support plate 3 is opened from the inside of the drill pipe joint outward, realizing the internal support and fixation of the drill pipe joint.

[0042] Subsequently, the second motor 13 is started, and the gear 14 at the output end of the second motor 13 rotates. Through meshing with the gear ring 15, it drives the turntable 2 to rotate relative to the worktable 1, causing the drill pipe joint fixed on the turntable 2 to rotate accordingly. At this time, the milling machine cutter can perform all-round milling of the outer diameter of the drill pipe joint. After the machining is completed, the first motor 11 is started in reverse, causing the inner support plate 3 to retract inward, releasing the clamping of the drill pipe joint, making it easy to remove the machined drill pipe joint.

[0043] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic tightening device for drilling rod joint milling, comprising a workbench (1), characterized in that: A turntable (2) is rotatably mounted on the workbench (1). The turntable (2) is horizontally mounted and rotates relative to the workbench (1). Multiple inner support plates (3) are slidably mounted on the top surface of the turntable (2). Adjacent inner support plates (3) are distributed at equal central angles along the center of the turntable (2). All inner support plates (3) slide simultaneously along the circle near or away from the center of the turntable (2). A fastening assembly (4) is mounted on the turntable (2) to drive all inner support plates (3) to move simultaneously. The fastening assembly (4) includes a screw (41), a positioning tube (42), a movable cylinder (43), and a connecting rod (44). The vertical center lines of the screw (41), positioning tube (42), movable cylinder (43), and turntable (2) are collinear. The bottom end of the positioning tube (42) Fixed at the center of the top surface of the turntable (2), the movable cylinder (43) is upside down on the top of the positioning tube (42) and slides vertically relative to the positioning tube (42). One end of the connecting rod (44) is hinged to the outer wall of the movable cylinder (43), and the other end is hinged to the inner support plate (3). The hinge shafts at both ends of the connecting rod (44) are horizontally set. The top end of the screw (41) passes through the center of the turntable (2) and the positioning tube (42) and is rotatably connected to the inner wall of the top of the movable cylinder (43). The screw (41) rotates relative to the movable cylinder (43) and is threadedly connected to the inner wall of the positioning tube (42). A sliding hole (21) is opened on the turntable (2). The sliding hole (21) is opened along the radius of the turntable (2), and the inner support plate (3) slides along the length of the sliding hole (21).

2. The automatic tightening device for milling the outer diameter of a drill pipe joint according to claim 1, characterized in that: The bottom surface of the workbench (1) is provided with a limit rod (12) and a first motor (11). The limit rod (12) is vertically set and one end is fixedly connected to the outer shell of the first motor (11). The other end passes through the turntable (2) and is inserted into the wall thickness of the positioning tube (42). The limit rod (12) is slidably set in the vertical direction. The output end of the first motor (11) is fixedly connected to the bottom end of the screw (41).

3. The automatic tightening device for milling the outer diameter of a drill pipe joint according to claim 1, characterized in that: A second motor (13) is fixed on the workbench (1), and a gear (14) is fixed at the output end of the second motor (13). A gear ring (15) is fixed on the circumferential outer wall of the turntable (2), and the gear (14) meshes with the gear ring (15).

4. The automatic tightening device for milling the outer diameter of a drill pipe joint according to claim 1, characterized in that: The inner support plate (3) is L-shaped and is used to support the end face of one end of the drill pipe joint.

5. The automatic tightening device for milling the outer diameter of a drill pipe joint according to claim 4, characterized in that: The inner support plate (3) has anti-slip texture (31) on its side wall away from the vertical center line of the turntable (2).

6. The automatic tightening device for milling the outer diameter of a drill pipe joint according to claim 1, characterized in that: Ribs (5) are fixed on the outer wall of the movable cylinder (43). The ribs (5) are arranged along the length of the movable cylinder (43), and the number of ribs (5) corresponds to the number of inner support plates (3). The hinge point between one end of the connecting rod (44) and the outer wall of the movable cylinder (43) is located on the rib (5).

7. The automatic tightening device for milling the outer diameter of a drill pipe joint according to claim 1, characterized in that: A slider (32) is fixed on the inner support plate (3). The slider (32) is inserted into the sliding hole (21) and slides along the sliding length direction. The cross section of the slider (32) is dovetail-shaped, and the cross section inside the sliding hole (21) is adapted to the slider (32).

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