A drill pipe end grinding mechanism

Abstract

This utility model discloses a drill rod end grinding mechanism, relating to the field of drill rod grinding technology. It aims to solve the technical problem that existing drill rod end grinding mechanisms easily cause thread wear and damage to the sealing surface accuracy when grinding drill rods with special structures, affecting the connection performance of the drill rod. The mechanism includes a frame, which comprises a base frame and side frames; and a reciprocating drive assembly, obliquely mounted on the outer wall of the side frame, including a disc. This utility model uses the reciprocating drive assembly to drive the disc to reciprocate along an inclined path. First, the drill rod to be ground is pushed to one end so that its end aligns with the end clamps. After adjusting the drill rod position, it is retracted to prevent obstruction of the grinding end. Simultaneously, through a transmission assembly, several protective arc plates are driven to synchronously approach the clamp axis, forming a circular protective sleeve that clamps the drill rod end, protecting it and reducing its shaking during grinding. Position adjustment and clamping protection are performed simultaneously, facilitating processing.

Description

Technical Field

[0001] This utility model relates to the field of drill rod grinding technology, and more specifically, to a drill rod end grinding mechanism. Background Technology

[0002] A drill pipe end grinding mechanism is a device used to grind the ends of drill pipes (such as connecting ends, cutting ends, etc.). Its core function is to remove burrs and oxide layers from the ends, or to correct the flatness and smoothness of the ends, through the high-speed movement of grinding heads (such as grinding wheels, wire wheels, grinding discs, etc.), to meet the subsequent use requirements of drill pipe connection, sealing, etc. This type of mechanism is widely used in the production or maintenance of drill pipes in fields such as geological drilling, oil and gas extraction, and mining machinery.

[0003] When grinding the ends of drill rods with special end structures (such as threaded connection ends or conical sealing ends), conventional grinding mechanisms often encounter difficulties. The grinding heads of ordinary grinding mechanisms are mostly flat or fixed in shape, making it difficult to precisely avoid critical areas such as thread profiles and sealing surfaces. This can easily lead to thread wear and damage to the sealing surface accuracy, ultimately affecting the connection performance of the drill rod. Furthermore, drill rods are often long, strip-shaped components (ranging from several meters to over ten meters in length). During end grinding, the "long rod + end" structure needs to be fixed, but the deflection and deformation due to the weight of the long rod can easily cause positioning errors. In addition, the reaction force of the grinding head during grinding may further exacerbate drill rod wobbling, leading to further thread wear and damage to the sealing surface accuracy, thus affecting the connection performance of the drill rod. Therefore, we propose a drill rod end grinding mechanism. Utility Model Content

[0004] The purpose of this invention is to provide a drill rod end grinding mechanism to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: it includes a frame, which includes a base frame and side frames;

[0006] A reciprocating drive assembly is obliquely mounted on the outer side wall of the frame side frame, including a disk that can reciprocate along the oblique path of the reciprocating drive assembly;

[0007] The transmission assembly includes a gear A disposed at the power output end of the reciprocating drive assembly, wherein a gear B with a larger diameter than gear A is meshed on the outer wall of gear A;

[0008] The end gripper includes a sheathed arc plate, which has several pieces and is equidistantly distributed around the circumference. The sheathed arc plates can be driven by a transmission component or a reciprocating drive component to synchronously move closer to / away from the axis of the end gripper.

[0009] As a further description of the above technical solution: the reciprocating drive assembly also includes a mounting frame, on which a rod is rotatably mounted. The rod can be driven by a motor. The outer wall of the rod is provided with a clockwise spiral groove and a counterclockwise spiral groove, which are connected end to end.

[0010] As a further description of the above technical solution: a sliding point is slidably connected inside the clockwise / counterclockwise spiral groove on the outer side wall of the rod, and a sliding arc plate is fixed on the outer side wall of the sliding point, and the sliding arc plate is sleeved on the outer side wall of the rod.

[0011] As a further description of the above technical solution: a sliding rod is also installed on the inner side wall of the mounting bracket, a sliding sleeve is slidably connected to the outer side wall of the sliding rod, the sliding sleeve is fixed to the outer side wall of the sliding arc plate, an electric telescopic rod is installed on the outer side wall of the sliding sleeve, and a disc is installed at the end of the electric telescopic rod.

[0012] As a further description of the above technical solution: a pulley A is coaxially fixed to the outer wall of the gear B, and a belt body is connected to the outer wall of the pulley A and the pulley B is connected through the belt body.

[0013] As a further description of the above technical solution: the end gripper also includes a housing disposed on the top of the frame base. A large bevel gear is rotatably connected to the inner side wall of the housing. A small bevel gear is meshed with one side of the outer side wall of the large bevel gear. The small bevel gear is coaxially connected to the outer side wall of the pulley B. Several movable grippers are meshed in a circular equidistant array on the other side of the outer side wall of the large bevel gear. The movable grippers are slidably connected in a groove on the surface of the housing. Protective arc plates are installed on opposite ends of the outer side walls of the movable grippers. There are several protective arc plates that can cooperate with each other.

[0014] As a further description of the above technical solution: a displacement drive assembly is also installed on the top of the frame base, and a grinder is installed on the power output end of the displacement drive assembly.

[0015] The drill rod end grinding mechanism provided by this utility model, as described above, has the following beneficial effects:

[0016] This invention uses a reciprocating drive assembly to move a disc back and forth along an inclined path. First, the drill rod to be ground is pushed to one end so that its end is aligned with the end gripper. After adjusting the position of the drill rod, it is retracted to prevent obstruction of the grinding end. At the same time, through the transmission assembly, several protective arc plates are driven to move synchronously towards the axis of the gripper, forming a circular protective sleeve that clamps the end of the drill rod, protecting the drill rod and reducing its shaking during grinding. Position adjustment and clamping protection are performed simultaneously, which facilitates processing and solves the problem that existing drill rod end grinding mechanisms are prone to thread wear and damage to the sealing surface precision when grinding drill rods with special structures, thus affecting the connection performance of the drill rod. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A structural schematic diagram provided for an embodiment of this utility model;

[0019] Figure 2 A structural schematic diagram provided for an embodiment of this utility model;

[0020] Figure 3 A structural schematic diagram provided for an embodiment of this utility model;

[0021] Figure 4 This is a structural schematic diagram provided for an embodiment of the present utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Frame; 2. Reciprocating drive assembly; 3. Transmission assembly; 4. End gripper; 5. Grinding machine; 6. Displacement drive assembly;

[0024] 201. Mounting bracket; 202. Motor; 203. Rod body; 204. Clockwise spiral groove; 205. Counterclockwise spiral groove; 206. Sliding rod; 207. Sliding point; 208. Sliding arc plate; 209. Sliding sleeve; 2010. Electric telescopic rod; 2011. Disc;

[0025] 301. Gear A; 302. Gear B; 303. Pulley A; 304. Belt body; 305. Pulley B;

[0026] 401. Outer shell; 402. Movable chuck; 403. Sheath arc plate; 404. Large bevel gear; 405. Small bevel gear. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0028] Please see Figures 1-4 This utility model embodiment provides a technical solution: including a frame 1, the frame 1 including a base frame and side frames;

[0029] In another embodiment of the present invention, preferably, a displacement drive assembly 6 is also installed on the top of the base frame of the frame 1, and a grinder 5 is installed on the power output end of the displacement drive assembly 6.

[0030] The frame 1 consists of a base frame and a side frame. The base frame is a horizontal load-bearing structure, and the side frame is vertically fixed to one side of the base frame to form an "L"-shaped support frame. The top of the base frame is equipped with a displacement drive assembly 6 (such as an existing linear guide slider plus an existing electric motor driven ball screw mechanism). Its power output end is connected to the grinder 5, which can drive the grinder 5 to move along the drill rod axis to grind the end.

[0031] The reciprocating drive assembly 2 is obliquely installed on the outer side wall of the side frame of the frame 1, and includes a disk 2011. The disk 2011 can reciprocate along the oblique path of the reciprocating drive assembly 2.

[0032] In another embodiment of the present invention, preferably, the reciprocating drive assembly 2 further includes a mounting bracket 201. A rod 203 is rotatably mounted on the inner side wall of the mounting bracket 201. The rod 203 can be driven by a motor 202. A clockwise spiral groove 204 and a counterclockwise spiral groove 205 are provided on the outer side wall of the rod 203. The clockwise spiral groove 204 and the counterclockwise spiral groove 205 are connected end to end. A sliding point 207 is slidably connected inside the clockwise spiral groove 204 / counterclockwise spiral groove 205 on the outer side wall of the rod 203. A sliding arc plate 208 is fixed on the outer side wall of the sliding point 207. The sliding arc plate 208 is sleeved on the outer side wall of the rod 203.

[0033] In another embodiment of the present invention, preferably, a sliding rod 206 is also installed on the inner side wall of the mounting bracket 201, and a sliding sleeve 209 is slidably connected to the outer side wall of the sliding rod 206. The sliding sleeve 209 is fixed to the outer side wall of the sliding arc plate 208, and an electric telescopic rod 2010 is installed on the outer side wall of the sliding sleeve 209. A disc 2011 is installed at the end of the electric telescopic rod 2010.

[0034] The reciprocating drive assembly 2 is used to push the drill rod end so that its end is aligned with the sheath arc plate 403 of the end gripper. It includes a mounting bracket 201 fixed to the side frame, and the inner wall of the rod 203 is rotatably supported by bearings. The rod 203 is driven by a motor 202 (such as a servo motor). The outer wall of the rod 203 has a clockwise spiral groove 204 and a counterclockwise spiral groove 205, which are connected end-to-end to form a closed trajectory. A sliding point 207 (such as a cylindrical pin) is embedded inside the spiral groove. A side-fixed sliding arc plate 208 (arc-shaped plate structure) is fitted on the outside of the rod body 203 and moves synchronously with the sliding point 207. A sliding rod 206 is set on the inner side wall of the mounting frame 201 parallel to the rod body 203. A sliding sleeve 209 is fitted on the outside of the sliding rod 206. The sliding sleeve 209 is fixedly connected to the sliding arc plate 208 and guides the sliding arc plate 208. An electric telescopic rod 2010 is installed on the outside of the sliding sleeve 209, and a disc 2011 is fixed at its end (for pushing the end of the drill rod).

[0035] When the motor 202 drives the rod body 203 to rotate, the sliding point 207 slides along the spiral groove trajectory: if the spiral groove 204 moves the sliding point 207 to one end in a clockwise direction, and the spiral groove 205 moves the sliding point 207 back to the other end in a counterclockwise direction, with the guidance of the sliding rod 206 and the sliding sleeve 209, the sliding arc plate 208 drives the electric telescopic rod 2010 and the disc 2011 to move back and forth along the axial direction of the rod body 203. At the same time, because the mounting bracket 201 is tilted and fixed, the movement path of the disc 2011 is tilted. While pushing the drill rod to adjust its end position, it returns to its original position and leaves the movement path of the grinder 5, so that the grinder 5 can grind smoothly.

[0036] Transmission assembly 3 includes a gear A301 disposed at the power output end of reciprocating drive assembly 2, and a gear B302 with a larger diameter than gear A301 meshing with the outer wall of gear A301.

[0037] In another embodiment of the present invention, preferably, a pulley A303 is coaxially fixed to the outer wall of gear B302, and a belt body 304 is connected to the outer wall of pulley A303 and pulley B305 is connected through the belt body 304.

[0038] The transmission assembly 3 converts the reciprocating drive power into the clamping action of the gripper, realizing the direction of force and speed reduction and torque increase. It includes a gear reduction unit (gear A301 and gear B302). Gear A301 is installed at the power output end (end of rod 203) of the reciprocating drive assembly 2. It meshes with gear B302 with a larger diameter. The gear ratio is used to reduce speed (the speed of gear B302 is lower than that of gear A301) and increase the output torque. Gear B302 is coaxially fixed with pulley A303 and connected to pulley B305 through belt body 304 to transmit power to end gripper 4.

[0039] The end gripper 4 includes a sheath arc plate 403. The sheath arc plate 403 has several pieces and is equidistantly distributed around the circumference. The several sheath arc plates 403 can be driven by the transmission component 3 and the reciprocating drive component 2 to synchronously move closer to / away from the axis of the end gripper 4.

[0040] In another embodiment of the present invention, preferably, the end gripper 4 further includes a housing 401 disposed on the top of the base frame of the frame 1. A large bevel gear 404 is rotatably connected to the inner side wall of the housing 401. A small bevel gear 405 is meshed with one side of the outer side wall of the large bevel gear 404. The small bevel gear 405 is coaxially connected to the outer side wall of the pulley B305. A plurality of movable grippers 402 are meshed in a circular equidistant array on the other side of the outer side wall of the large bevel gear 404. The movable grippers 402 are slidably connected in the sliding groove on the surface of the housing 401. A protective arc plate 403 is installed on the opposite ends of the outer side wall of the movable grippers 402. There are a plurality of protective arc plates 403 and they can cooperate with each other.

[0041] The end gripper 4 is used to stably clamp and protect the end of the drill rod. It can be a 1 / n special protective sleeve, such as a special threaded protective sleeve. The outer shell 401 is fixed to the top of the frame 1 base frame to provide protection and support for the internal transmission components. The surface is provided with radially distributed sliding grooves. The inner side wall of the outer shell 401 is rotatably mounted with a large bevel gear 404 through a bearing. One side of the large bevel gear 404 meshes with a small bevel gear 405 (coaxially fixed to the outer side wall of the pulley B305). The other side is equidistantly meshed with several movable grippers 402 (the ends of the movable grippers 402 are provided with teeth that match the large bevel gear 404).

[0042] The movable claw 402 slides in the groove of the outer shell 401, and the opposite end (near the center side) of the fixed sleeve arc plate 403 is fixed. Multiple sleeve arc plates 403 can be assembled into a circular clamping cavity. After the multiple sleeve arc plates 403 are assembled into a circular clamping cavity, there is still a gap between the multiple sleeve arc plates 403 to ensure that the clamping state is not loosened.

[0043] The pulley B305 drives the small bevel gear 405 to rotate, which in turn drives the large bevel gear 404 to rotate. Through tooth meshing, the movable pawl 402 is driven to slide radially (while moving closer to or away from the center). When they move closer, the sheath arc plate 403 closes to form a ring clamp.

[0044] Working principle: This embodiment provides a drill rod end grinding mechanism. In use, the drill rod to be ground is placed on the top of the machine frame base and inserted into the round hole at the center of the end jaw 4 (the diameter of the round hole should be larger than the diameter of the drill rod to be ground. Several three-jaw chucks or other clamps coaxial with the end jaw 4 can be set at intervals on the top of the machine frame base). The end of the drill rod to be ground that is close to the grinding machine 5 extends out from the end jaw 4.

[0045] When the external power supply is turned on by the external switch, the motor 202 is driven to rotate the rod 203. The sliding point 207 drives the sliding arc plate 208, the sliding sleeve 209 and the electric telescopic rod 2010 to move along the spiral groove (such as the clockwise spiral groove 204), so that the disc 2011 moves along the inclined path towards the end of the drill rod to be ground.

[0046] After the disc 2011 contacts the drill rod, it pushes the drill rod axially through the inclined thrust until the end of the drill rod to be ground is roughly aligned with the sleeve arc plate 403. Then, the sliding point 207 slides from the spiral groove connection into the next channel (such as the counterclockwise spiral groove 205), which drives the sliding arc plate 208, the sliding sleeve 209 and the electric telescopic rod 2010 to move horizontally, so that the disc 2011 moves away from the end of the drill rod to be ground along the inclined path. At the same time, due to the inclined movement path, the reset disc 2011 has moved away from the grinding machine 5 and the end of the drill rod to be ground. The external power supply drives the electric telescopic rod 2010 to shorten through the external switch, so that the reset disc 2011 moves away from the horizontal movement path of the grinding machine 5.

[0047] Meanwhile, the reciprocating drive assembly 2 transmits power through the transmission assembly 3: gear A301 drives gear B302 to decelerate and rotate, and drives the small bevel gear 405 through pulley A303, belt body 304, and pulley B305; the small bevel gear 405 meshes with the large bevel gear 404, which drives the movable chuck 402 to retract synchronously towards the center, and the sheath arc plate 403 closes and clamps the end of the drill rod, completing the clamping and protection, and also reducing the shaking of the drill rod during the grinding process and improving the grinding accuracy;

[0048] It should be noted that in actual use, the transmission ratio of the transmission component 3 needs to be adjusted so that after the disc 2011 is reset, the movable chuck 402 can reach the position to clamp the drill rod.

[0049] The displacement drive component 6 (such as a lead screw driven by a servo motor) drives the grinder 5 to move to the end of the drill rod and grinds it according to a preset trajectory (such as end face plane, bevel, etc.).

[0050] After grinding is completed, the grinder 5 retracts, the chuck 4 releases, and the drill rod is removed, ready for the next work cycle.

[0051] The reciprocating drive assembly 2 drives the disc 2011 to reciprocate along an inclined path. First, it pushes the drill rod to be ground to one end so that its end is aligned with the end clamp 4. After adjusting the position of the drill rod, it retracts to prevent it from blocking the grinding machine 5 from grinding the end. At the same time, through the transmission assembly 3, several protective arc plates 403 are driven to move synchronously close to the center of the clamp, forming a circular protective sleeve that clamps the end of the drill rod, protecting the drill rod and reducing the shaking of the drill rod during grinding. The position adjustment and clamping protection are carried out simultaneously, which is convenient for processing (the grinding machine 5, the displacement drive assembly 6 and the motor 202 are all existing products on the market and are all connected to an external power supply and an external switch).

[0052] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A drill rod end polishing mechanism characterized by, Includes a frame (1), which includes a base frame and side frames; A reciprocating drive assembly (2) is obliquely mounted on the outer side wall of the side frame of the frame (1), including a disk (2011), which can reciprocate along the oblique path of the reciprocating drive assembly (2); The transmission assembly (3) includes a gear A (301) disposed at the power output end of the reciprocating drive assembly (2), and a gear B (302) with a larger diameter than gear A (301) is meshed on the outer wall of the gear A (301); The end gripper (4) includes a sheath arc plate (403), which has several pieces and is equidistantly distributed around the circumference. The several pieces of the sheath arc plate (403) can be driven by the transmission component (3) and the reciprocating drive component (2) to synchronously move closer to / away from the axis of the end gripper (4).

2. A drill pipe end conditioning mechanism as defined in claim 1, wherein, The reciprocating drive assembly (2) further includes a mounting bracket (201). A rod (203) is rotatably mounted on the inner side wall of the mounting bracket (201). The rod (203) can be driven by a motor (202). A clockwise spiral groove (204) and a counterclockwise spiral groove (205) are provided on the outer side wall of the rod (203). The clockwise spiral groove (204) and the counterclockwise spiral groove (205) are connected end to end.

3. A drill pipe end conditioning mechanism as defined in claim 2 wherein, The clockwise spiral groove (204) / counterclockwise spiral groove (205) on the outer side wall of the rod (203) is slidably connected to a sliding point (207). A sliding arc plate (208) is fixed on the outer side wall of the sliding point (207), and the sliding arc plate (208) is sleeved on the outer side wall of the rod (203).

4. A drill pipe end conditioning mechanism as defined in claim 3, wherein, The inner wall of the mounting bracket (201) is also equipped with a sliding rod (206), and a sliding sleeve (209) is slidably connected to the outer wall of the sliding rod (206). The sliding sleeve (209) is fixed to the outer wall of the sliding arc plate (208). An electric telescopic rod (2010) is installed on the outer wall of the sliding sleeve (209), and a disc (2011) is installed at the end of the electric telescopic rod (2010).

5. A drill pipe end conditioning mechanism as defined in claim 4, wherein, The outer wall of gear B (302) is coaxially fixed with pulley A (303), and the outer wall of pulley A (303) is connected to belt body (304) and pulley B (305) is connected through belt body (304).

6. A drill pipe end conditioning mechanism as defined in claim 5, wherein, The end gripper (4) also includes a housing (401) disposed on the top of the frame (1). A large bevel gear (404) is rotatably connected to the inner wall of the housing (401). A small bevel gear (405) is meshed with one side of the outer wall of the large bevel gear (404). The small bevel gear (405) is coaxially connected to the outer wall of the pulley B (305). A number of movable grippers (402) are meshed in a circular equidistant array on the other side of the outer wall of the large bevel gear (404). The movable grippers (402) are slidably connected in a groove on the surface of the housing (401). A protective arc plate (403) is installed on the opposite end of the outer wall of the movable grippers (402). There are several protective arc plates (403) that can cooperate with each other.

7. A drill pipe end conditioning mechanism as defined in claim 6 wherein, The rack (1) chassis top is further provided with a displacement driving assembly (6), and a grinder (5) is installed at the power output end of the displacement driving assembly (6).

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