A rotary clamping device for adjusting clamping force and a steel drill.

Abstract

This invention discloses a rotary clamping device and a metal drill for adjusting clamping force, comprising a roller clamping mechanism. The roller clamping mechanism is slidably mounted on a bracket via a clamping cylinder. The key feature is that a spring cylinder is movably mounted at the bottom center of the bracket via a trunnion seat. A floating roller for actively applying clamping force is fixedly connected to the top of the spring cylinder. A pressure regulating valve for adjusting the extension and retraction range of the spring cylinder is hydraulically connected to the spring cylinder. The pressure regulating valve is synchronously powered by a synchronous motor for driving the rotation of the roller clamping mechanism and the floating roller. The synchronous motor and the pressure regulating valve are connected to a multi-way valve. This invention utilizes the pressure regulating valve to adjust the extension and retraction range of the spring cylinder, making the clamping force adjustable and avoiding problems such as the synchronous motor failing to operate or the rotary clamping mechanism slipping due to the roller clamping mechanism stopping due to the sleeve or pipe string or insufficient clamping force.

Description

Technical Field

[0001] This invention belongs to the technical field of oil drilling, specifically relating to a rotary clamping device for adjusting clamping force and an iron drill. Background Technology

[0002] Oil drilling mostly uses casing or tubing for exploration and extraction. Casing or tubing is typically threaded using a steel drill bit to complete the exploration and extraction process. Currently, the clamping mechanism of steel drill bit pliers is mostly a fixed clamping structure, often driven by an even number of fixed motors. This makes the clamping force unadjustable after the clamping arms are engaged, leading to slippage during threading or the motors failing to rotate after the clamping arms have gripped the casing or tubing. This results in the inability to reach the set threading torque, requiring repeated tightening of the pliers during threading, thus affecting threading efficiency.

[0003] At present, the purpose of using guide rod assembly to realize the synchronous clamping of drill pipe by rotating support and rotating roller is to improve the reliability of clamping force. However, the clamping force is still not adjustable and cannot solve the problems of rotating slippage or motor not running after clamping casing or pipe string. For example, Chinese Patent Publication No. CN106812481A, published on June 9, 2017, discloses a rotary screw mechanism for iron drills. The document states that "the guide rod assembly is sleeved with the guide groove on the crossbeam seat via a guide pin. The guide pin moves back and forth along the guide groove, thereby ensuring the synchronous movement of the guide rod assemblies on both sides, and thus enabling the rotary screw rollers on both sides to clamp synchronously." This prior art achieves synchronous clamping of the drill rod by having two guide rod assemblies move synchronously along the guide groove, thus enabling the rotary screw supports on both sides to drive the rotary screw rollers to clamp the drill rod synchronously. While this ensures the synchronicity of the rotary screw mechanism's movement and the reliability of the clamping force, the two guide rod assemblies in this prior art cannot adjust the clamping force. Therefore, it cannot solve the problems of screw slippage or the motor not rotating after the clamping arm clamps the casing or pipe string. Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary pliers clamping device and a steel drill for adjusting the clamping force, so as to solve the problems mentioned in the background art where the clamping force of the current rotary pliers clamping device is not adjustable, and the problem of the rotary pliers slipping or the motor not running after the clamping arm clamps the sleeve or pipe column cannot be solved.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotary clamping device for adjusting clamping force, comprising a roller clamping mechanism, wherein the roller clamping mechanism is slidably mounted on a bracket via a clamping cylinder, characterized in that a spring cylinder is movably mounted at the bottom center of the bracket via a trunnion seat, a floating roller for actively applying clamping force is fixedly connected to the top of the spring cylinder, a pressure regulating valve for adjusting the extension and retraction amplitude of the spring cylinder is hydraulically connected to the spring cylinder, and a synchronous motor for driving the roller clamping mechanism and the floating roller to rotate is synchronously powered by the pressure regulating valve, wherein the synchronous motor and the pressure regulating valve are connected to a multi-way valve.

[0006] Furthermore, the synchronous motor is configured as three groups, namely motor A, motor B and motor C, which are connected in parallel on the multi-way valve.

[0007] Furthermore, the motor A is dynamically rotatably connected to the floating roller, the bottom of the floating roller is fixedly connected to the top of the spring cylinder via a connecting shaft, and the middle part of the spring cylinder is movably fixedly connected to the roller clamping mechanism via a sliding pin.

[0008] Furthermore, the roller clamping mechanism includes a left roller, a right roller, a left clamping arm for supporting the left roller, and a right clamping arm for supporting the right roller. The tops of the right clamping arm and the left clamping arm are respectively fixedly connected to the right roller and the left roller by bearing seats in a rolling manner. The left roller and the right roller are respectively powered and rotatably connected to motor B and motor C. The upper middle parts of the left clamping arm and the right clamping arm are respectively fixedly connected to two clamping cylinders. The two clamping cylinders are connected in series on a multi-way valve through oil valves. The two clamping cylinders are respectively movably mounted at both ends of the bottom of the bracket through piston rods. The bottoms of the left clamping arm and the bottoms of the right clamping arm are arranged in an overlapping manner through sliding pins. The sliding pins are fixedly mounted on the spring cylinder.

[0009] Furthermore, the left clamping arm is slidably connected to the left side of the bracket via a clamping cylinder and a left arc-shaped guide bar, and the right clamping arm is slidably connected to the right side of the bracket via a clamping cylinder and a right arc-shaped guide bar.

[0010] Furthermore, a left arc-shaped guide bar is provided on the left side of the left clamping arm to limit the range of motion of the left clamping arm. A left guide roller is rolled and closely attached to the left side of the left arc-shaped guide bar to guide the direction of movement of the left clamping arm. A left support roller is rolled and closely attached to the right side of the left arc-shaped guide bar to cooperate with the left guide roller to support the left arc-shaped guide bar.

[0011] Furthermore, a right arc-shaped guide bar is provided on the right side of the right clamping arm to limit the range of motion of the right clamping arm. A right guide roller is rolled and closely attached to the right side of the right arc-shaped guide bar to guide the direction of movement of the right clamping arm. A right support roller is rolled and closely attached to the left side of the right arc-shaped guide bar to cooperate with the right guide roller to support the right arc-shaped guide bar.

[0012] Furthermore, the right guide roller and the left guide roller are respectively fixedly installed at the top two ends of the bracket, and the left support roller and the right support roller are respectively fixedly installed at the middle left side of the left clamping arm and the middle right side of the right clamping arm.

[0013] In addition to the above technical solutions, there are also iron drillers equipped with the rotary clamping device.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention employs a fixed configuration of a spring cylinder and a floating roller, enabling the rotary clamping device to actively apply clamping force. This allows the device to automatically adapt to the diameter of the sleeve or pipe, effectively improving clamping efficiency and effectiveness. Utilizing a pressure regulating valve, the spring cylinder's extension and retraction are controlled, allowing the clamping force applied by the floating roller to adjust accordingly. This makes the clamping force adjustable, resolving the issue of the tangent ratio between the rotary torque and clamping torque. This ensures the required tangent ratio for different sleeves or pipes. A multi-way valve synchronizes the pressure regulating valve and the synchronous motor, effectively preventing the synchronous motor from failing to operate or the rotary clamping mechanism from slipping due to insufficient clamping force or the sleeve or pipe stopping. This significantly improves the reliability and synchronization of the synchronous motor, guaranteeing the clamping force of the rotary clamping device.

[0016] 2. This invention employs motors A, B, and C connected in parallel, enabling the floating roller, left roller, and right roller to simultaneously clamp the sleeve or pipe, effectively improving the synchronicity of the rotary clamping device. By dynamically rotating motors A, B, and C with the floating roller, left roller, and right roller respectively, the rotary clamping device can automatically adapt to the diameter of the sleeve or pipe, effectively improving clamping efficiency and effectiveness. It also effectively avoids problems such as the synchronous motor failing to operate or the rotary clamping mechanism slipping due to the sleeve or pipe stopping or insufficient clamping force, thus effectively improving the reliability and synchronicity of the synchronous motor and ensuring the clamping force of the rotary clamping device.

[0017] 3. This invention employs left and right arc-shaped guide bars that are respectively coordinated with the left guide roller, left support roller, right guide roller, and right support roller. This ensures that the sliding direction of the left and right clamping arms is within a controllable range, effectively improving the clamping effect of the left and right rollers. The bottoms of the left and right clamping arms are overlapped on the spring cylinder via a sliding pin, enabling the left and right rollers to clamp synchronously with the floating roller. This solves the problem of the tangential ratio between the turning torque and the clamping torque, ensuring the tangential ratio required for turning different sleeves or pipe columns. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall front structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall rear structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the hydraulic power principle structure of the present invention.

[0021] The components include: 1. Roller clamping mechanism; 101. Left roller; 1011. Left clamping arm; 102. Right roller; 1021. Right clamping arm; 2. Clamping cylinder; 3. Bracket; 4. Trunnion seat; 5. Spring cylinder; 6. Floating roller; 7. Pressure regulating valve; 8. Synchronous motor; 801. Motor A; 802. Motor B; 803. Motor C; 9. Multi-way valve; 10. Connecting shaft; 11. Sliding pin; 12. Bearing seat; 13. Oil valve; 14. Piston rod; 15. Left arc-shaped guide bar; 16. Right arc-shaped guide bar; 17. Left guide roller; 18. Left support roller; 19. Right guide roller; 20. Right support roller. Detailed Implementation

[0022] The following examples are used to further illustrate the content of the present invention and do not limit the application of the present invention.

[0023] Example 1:

[0024] Please see Figures 1-3 A rotary clamping device for adjusting clamping force includes a roller clamping mechanism 1, which is slidably mounted on a bracket 3 via a clamping cylinder 2. A spring cylinder 5 for controlling the clamping force of a floating roller 6 is movably mounted at the bottom center of the bracket 3 via a trunnion seat 4. A floating roller 6 for actively applying clamping force is fixedly connected to the top of the spring cylinder 5. A pressure regulating valve 7 for adjusting the extension and retraction range of the spring cylinder 5 is hydraulically connected to the spring cylinder 5. A synchronous motor 8 for driving the rotation of the roller clamping mechanism 1 and the floating roller 6 is synchronously powered to the pressure regulating valve 7. The synchronous motor 8 and the pressure regulating valve 7 are connected to a multi-way valve 9.

[0025] Please see Figure 3 The synchronous motor 8 is configured as three sets, namely motor A801, motor B802 and motor C803. Motors A801, motor B802 and motor C803 are connected in parallel on the multi-way valve 9.

[0026] Please see Figures 1-3 The motor A801 ​​is dynamically rotatably connected to the floating roller 6. The bottom of the floating roller 6 is fixedly connected to the top of the spring cylinder 5 through the connecting shaft 10. The middle part of the spring cylinder 5 is movably fixedly connected to the roller clamping mechanism 1 through the sliding pin 11, so that the roller clamping mechanism 1 and the floating roller 6 can be clamped synchronously. This solves the problem of the tangential ratio between the turning torque and the clamping torque (the ratio between the turning torque and the clamping torque), and ensures the tangential ratio required for turning different sleeves or pipe columns.

[0027] Please see Figures 1-3 The roller clamping mechanism 1 includes a left roller 101, a right roller 102, a left clamping arm 1011 for supporting the left roller 101, and a right clamping arm 1021 for supporting the right roller 102. The tops of the right clamping arm 1021 and the left clamping arm 1011 are respectively fixedly connected to the right roller 102 and the left roller 101 by rolling through bearing seats 12. The left roller 101 and the right roller 102 are respectively rotatedly connected to motors B802 and C803. The bottoms of the left clamping arm 1011 and the right clamping arm 1021 are arranged in an overlapping manner through sliding pins 11. The sliding pins 11 are fixedly mounted on the spring cylinder 5.

[0028] The upper middle parts of the left clamping arm 1011 and the right clamping arm 1021 are fixedly connected to two clamping cylinders 2 respectively. The two clamping cylinders 2 are connected in series on the multi-way valve 9 through the oil valve 13. The two clamping cylinders 2 are movably set at both ends of the bottom of the bracket 3 through the piston rod 14 respectively.

[0029] A left arc-shaped guide bar 15 is provided on the left side of the left clamping arm 1011 to limit the range of motion of the left clamping arm 1011. The left clamping arm 1011 is slidably connected to the left side of the bracket 3 through the clamping cylinder 2 and the left arc-shaped guide bar 15. A right arc-shaped guide bar 16 is provided on the right side of the right clamping arm 1021 to limit the range of motion of the right clamping arm 1021. The right clamping arm 1021 is slidably connected to the right side of the bracket 3 through the clamping cylinder 2 and the right arc-shaped guide bar 16.

[0030] A left guide roller 17 is rolled and closely attached to the left side of the left arc-shaped guide bar 15 to guide the movement direction of the left clamping arm 1011. The left guide roller 17 is fixedly attached to the top end of the bracket 3. A left support roller 18 is rolled and closely attached to the right side of the left arc-shaped guide bar 15 to cooperate with the left guide roller 17 to support the left arc-shaped guide bar 15. The left support roller 18 is fixedly attached to the middle of the left side of the left clamping arm 1011.

[0031] A right guide roller 19 is rolled and closely attached to the right side of the right arc-shaped guide bar 16 to guide the movement direction of the right clamping arm 1021. The right guide roller 19 is fixedly attached to the top of the bracket 3. A right support roller 20 is rolled and closely attached to the left side of the right arc-shaped guide bar 16 to cooperate with the right guide roller 19 to support the right arc-shaped guide bar 16. The right support roller 20 is fixedly attached to the middle of the right side of the right clamping arm 1021.

[0032] During the assembly of the twist-lock clamping device, such as Figures 1-3The diagram illustrates that the entire clamping device of the rotary pliers is installed inside the rotary pliers, giving the rotary pliers the characteristic of adjustable clamping force, thereby achieving the purpose of preventing slippage during rotary pliers operation or ensuring the normal operation of the synchronous motor 8. Specifically: First, the structure of the bracket 3 is designed according to the rotary pliers. Then, left guide roller 17 and right guide roller 19 are fixed to the top two ends of the bracket 3, respectively. Next, a trunnion seat 4 is fixed to the middle position of the bottom of the bracket 3. Then, a spring cylinder 5 is movably connected inside the trunnion seat 4. The spring cylinder 5 is hydraulically connected to a pressure regulating valve 7 (the basic structure of existing pressure regulating valves, such as pressure adjustment, is not specifically described here, but this should not limit its functionality). The pressure regulating valve 7 is connected to a multi-way valve 9 (the functions and structures of multi-way valves and other conventional equipment are well known in the art, and the connection settings are also common knowledge, so they will not be described in detail here). Finally, the spring cylinder 5 is located at the top... The floating roller 6 is fixed by the connecting shaft 10, so that the floating roller 6 is locked in the middle position of the top of the bracket 3. Then, the motor A801 ​​is dynamically connected to the floating roller 6 (the basic structure of existing synchronous motors, such as drive rotation, is not specifically described here, but should not limit its function). The motor A801 ​​is synchronously connected to the pressure regulating valve 7 and set on the multi-way valve 9. Thus, the floating roller 6 can not only actively apply clamping force to the sleeve or pipe under the drive rotation of the motor A801, but also adjust the clamping force by adjusting the extension and retraction range of the spring cylinder 5 under the pressure regulating valve 7. That is, the installation of the floating roller 6 and the spring cylinder 5 and the setting of the hydraulic system are completed.Then, the left clamping arm 1011 and the right clamping arm 1021 are fixed to the outer side of the spring cylinder 5 by overlapping sliding pins 11. Next, a left arc-shaped guide strip 15 is fixed to the left side of the left clamping arm 1011, and a right arc-shaped guide strip 16 is fixed to the right side of the right clamping arm 1021, so that the left arc-shaped guide strip 15 rolls tightly against the left guide roller 17, and the right arc-shaped guide strip 16 rolls tightly against the right guide roller 19. Then, a left support roller 18 is rolled tightly against the right side of the left arc-shaped guide strip 15, and a right support roller 20 is rolled tightly against the left side of the right arc-shaped guide strip 16, so that the left arc-shaped guide strip 15 slides between the left guide roller 17 and the left support roller 18, and the right arc-shaped guide strip 16 slides between the right guide roller 19 and the right support roller 20, thereby allowing the left clamping arm 1011 and the right clamping arm 1021 to slide at both ends of the bracket 3 respectively. Then, the left clamping arm 1011... Two clamping cylinders 2 are fixed to the upper middle parts of the left clamping arm 1011 and the right clamping arm 1021, respectively. A piston rod 14 is movably connected to the bottom of each clamping cylinder 2. Each piston rod 14 is fixed to both ends of the bottom of the bracket 3 (i.e., both sides of the trunnion seat 4). Simultaneously, a left roller 101 and a right roller 102 are fixed to the top ends of the left clamping arm 101 and the right clamping arm 1021 respectively via bearing seats 12. Motors B802 and C803 are rotatably connected to the left roller 101 and the right roller 102, respectively. Motors B802 and C803 are then connected in parallel with motor A801 ​​to the multi-way valve 9. This allows the left roller 101, the right roller 102, and the floating roller 6 to clamp the sleeve or pipe under the drive of motors B802, C803, and A801, respectively, thus completing the installation of the rotary clamping pliers clamping device.

[0033] The working principle and usage process of this invention are as follows: Figures 1-3 The diagram illustrates that when the casing or tubing needs to be clamped by the swivel clamps, the operator uses the multi-way valve 9 to operate the oil valve 13, controlling the two clamping cylinders 2 to retract their piston rods 14. At this time, the left clamping arm 1011 and the right clamping arm 1021, under the retraction of the piston rods 14 and guided by the left arc-shaped guide bar 15 and the right arc-shaped guide bar 16 respectively, will drive the left roller 101 and the right roller 102 to move inward, thereby achieving the purpose of clamping the casing or tubing. Simultaneously, the pressure regulating valve 7 is operated via the multi-way valve 9 to control... The spring cylinder 5 is stretched, causing the floating roller 6 to extend under the stretch of the spring cylinder 5, thereby actively applying clamping force to the sleeve or pipe. Then, the multi-way valve 9 is operated to control the motors A801, B802 and C803 to rotate synchronously, so that the sleeve or pipe rotates under the clamping of the left roller 101, right roller 102 and floating roller 6. This effectively avoids the problem of the synchronous motor 8 not running or the screw slipping due to the roller clamping mechanism 1 stopping due to the sleeve or pipe or the clamping force being too small.

[0034] When it is necessary to clamp casings or tubing of different diameters, the operator only needs to operate the pressure regulating valve 7 through the multi-way valve 9 to control the extension amplitude of the spring cylinder 5. This allows the floating roller 6 to actively apply the corresponding clamping force according to the diameter of the casing or tubing, so that the rotary clamping device can automatically adapt to the diameter of the casing or tubing. This solves the problem of the tangential ratio between the rotary torque and the clamping torque, ensuring the tangential ratio required for the rotary clamping of different casings or tubing.

[0035] Example 2:

[0036] Please see Figures 1-3 As another objective of the present invention, a steel drill is provided, wherein the steel drill is provided with any of the above-described rotary clamping devices, so that the steel drill can obtain any of the beneficial effects of the rotary clamping devices described above, which will not be repeated here.

Claims

1. A rotary clamping device for adjusting clamping force, comprising a roller clamping mechanism, wherein the roller clamping mechanism is slidably mounted on a bracket via a clamping cylinder, characterized in that, A spring cylinder is movably mounted at the bottom center of the bracket via a trunnion seat. A floating roller for actively applying clamping force is fixedly connected to the top of the spring cylinder. A pressure regulating valve for adjusting the extension and retraction range of the spring cylinder is hydraulically connected to the spring cylinder. The pressure regulating valve is synchronously powered to a synchronous motor for driving the roller clamping mechanism and the floating roller to rotate. The synchronous motor and the pressure regulating valve are connected to a multi-way valve. The synchronous motor is configured as three sets, namely motor A, motor B and motor C. Motors A, motor B and motor C are connected in parallel on the multi-way valve. Motor A is dynamically rotatably connected to the floating roller. The bottom of the floating roller is fixedly connected to the top of the spring cylinder through a connecting shaft. The middle part of the spring cylinder is movably fixedly connected to the roller clamping mechanism through a sliding pin. The roller clamping mechanism includes a left roller, a right roller, a left clamping arm for supporting the left roller, and a right clamping arm for supporting the right roller. The tops of the right clamping arm and the left clamping arm are respectively fixedly connected to the right roller and the left roller by bearing seats in a rolling manner. The left roller and the right roller are respectively rotatably connected to motor B and motor C. The upper middle parts of the left clamping arm and the right clamping arm are respectively fixedly connected to two clamping cylinders. The two clamping cylinders are connected in series on a multi-way valve through oil valves. The two clamping cylinders are respectively movably mounted at both ends of the bottom of the bracket through piston rods. The bottoms of the left clamping arm and the bottoms of the right clamping arm are overlapped by sliding pins, and the sliding pins are fixedly mounted on spring cylinders. The left clamping arm is slidably connected to the left side of the bracket via a clamping cylinder and a left arc-shaped guide bar, and the right clamping arm is slidably connected to the right side of the bracket via a clamping cylinder and a right arc-shaped guide bar.

2. The rotary clamping device for adjusting clamping force according to claim 1, characterized in that, The left side of the left clamping arm is provided with a left arc-shaped guide bar for limiting the range of motion of the left clamping arm, and the right side of the right clamping arm is provided with a right arc-shaped guide bar for limiting the range of motion of the right clamping arm.

3. The rotary clamping device for adjusting clamping force according to claim 2, characterized in that, The left arc-shaped guide bar has a left guide roller that is rolled and closely attached to the left side to guide the movement direction of the left clamping arm, and the right arc-shaped guide bar has a right guide roller that is rolled and closely attached to the right side to guide the movement direction of the right clamping arm. The right guide roller and the left guide roller are respectively fixedly mounted at the top two ends of the bracket.

4. The rotary clamping device for adjusting clamping force according to claim 3, characterized in that, The left arc-shaped guide strip has a left support roller that is rolled and closely attached to its right side to cooperate with the left guide roller to support the left arc-shaped guide strip. The right arc-shaped guide strip has a right support roller that is rolled and closely attached to its left side to cooperate with the right guide roller to support the right arc-shaped guide strip. The left support roller and the right support roller are respectively fixedly installed in the middle of the left side of the left clamping arm and the middle of the right side of the right clamping arm.

5. A type of iron drill, characterized in that, Includes the rotary clamping device as described in any one of claims 1-4.

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