Rotary clamping equipment for medium-caliber seamless steel pipe for fluid transportation and use method

Abstract

The invention discloses rotary clamping equipment for a medium-caliber seamless steel pipe for fluid conveying and a using method, and relates to the technical field of steel pipe machining. The rotary clamping equipment for the seamless steel pipe for conveying the medium-caliber fluid comprises a rack, a steel pipe, a machine box and a supporting frame, and further comprises a chuck assembly which is coaxially and rotatably installed on the machine box and the supporting frame and used for fixing the two ends of the steel pipe. The double-row cylindrical self-aligning bearing is used for supporting the main shaft sleeve, passive self-adaptive self-aligning of the main shaft sleeve is achieved, a chuck assembly at the driving end can follow the instantaneous rotation axis of actual bending change of a steel pipe in real time, and a workpiece is not forced to conform to the theoretical axis of equipment; the problems of spiral line contact between the clamping jaw and the surface of the steel pipe, local stress concentration and periodic pulsation attenuation of clamping force caused by forced centering under traditional rigid clamping are solved, it is guaranteed from the source that the clamping jaw and the outer edge of the steel pipe always keep stable and uniform surface contact in the initial clamping stage and the rotating process, and axial movement is eliminated.

Description

Technical Field

[0001] This invention relates to the field of steel pipe processing technology, specifically to a rotating clamping device and method for using seamless steel pipes for medium-diameter fluid transportation. Background Technology

[0002] Currently, seamless steel pipes are generally processed using a chuck to clamp one end and a middle roller to support them during rotary clamping. The straightness of seamless steel pipes used for fluid transportation is currently 1.5-2.0 mm / meter. This straightness makes it difficult for the steel pipe's own axis to be coaxial with the roller's axis. When the steel pipe rotates, a tangential force is generated, causing the chuck and steel pipe to be out of sync. This further results in a spiral line contact between the chuck jaws and the steel pipe during clamping, rather than a surface-to-surface engagement. Moreover, the position of this contact point changes continuously as the steel pipe rotates. At the moment of change, the clamping force decreases rapidly. Medium-diameter steel pipes have a large weight, resulting in greater surface friction between them and the roller during rotation. When the clamping force is less than the axial tangential force and friction, the steel pipe will move axially, commonly known as "not being clamped tightly".

[0003] Chinese invention patent application CN103692234A discloses a method for machining a slender, thin-walled flexible shaft intermediate sleeve. This structure solves problems such as poor rigidity of the machining system, cutting deflection, and rotational chatter by using a contour alignment and a two-stage clamping method, and by using a dial indicator to track and check the runout state near the machining area, ensuring consistency between the two clamping states.

[0004] However, the essence of the above structure is to compensate for the initial bending of the workpiece through precise adjustment under static conditions, and then perform locking machining. This method is effective for small batches of high-precision shaft parts, and is a static compensation. Once clamping is completed, the system becomes a rigid connection, which cannot cope with the dynamic deformation and new misalignment trends caused by centrifugal force, cutting force or residual stress release during the rotation of the steel pipe. Therefore, the special equipment and method that can adapt to the changes in the workpiece axis in real time and automatically, actively suppress vibration and movement, and thus achieve reliable clamping and high-precision machining has become a key technical bottleneck restricting the technological progress and industrial upgrading in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rotating clamping device and method for using seamless steel pipes for medium-diameter fluid transportation, thus solving the problems raised in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a seamless steel pipe rotary clamping device for medium-diameter fluid transport, comprising a frame, a steel pipe, a housing, and a support frame, further comprising: a chuck assembly, coaxially rotatably mounted on the housing and the support frame, used for fixing both ends of the steel pipe; double-row cylindrical self-aligning bearings, mounted on both sides of the housing, with a main shaft sleeve installed between the inner rings of the two double-row cylindrical self-aligning bearings, one end of the main shaft sleeve being fixed to the chuck assembly near the housing, and the other end of the main shaft sleeve extending outside the housing and provided with a damping structure, the damping structure being used to reduce the swing of the main shaft sleeve; and a first buffer assembly, located inside the housing, used to assist in reducing the swing of the main shaft sleeve.

[0007] Furthermore, the damping structure includes: an annular fixed frame, fixed to the other end of the main shaft sleeve, on which first guide rods are installed at equal intervals, a counterweight is slidably installed on the first guide rod, and a first spring is installed on the outer side of the first guide rod between the counterweight and the end of the first guide rod, the first spring being used to drive the counterweight to slide toward the annular fixed frame; a movable ring, installed on one side of the annular fixed frame, having an annular groove, a rotating ring being provided in the annular groove, the rotating ring being hinged to the counterweight with a connecting rod; and a second buffer assembly, located on one side of the movable ring, for reducing the swaying of the steel pipe.

[0008] Furthermore, the first buffer assembly includes: a sleeve, which is sleeved on the outside of the main shaft sleeve and slidably connected along the axial direction of the main shaft sleeve; a first movable column, which is circumferentially arranged on the outside of the main shaft sleeve and slidably connected to the main shaft sleeve; a third spring is installed inside the first movable column, which is used to drive the first movable column to move toward the steel pipe; and both ends of the first movable column are provided with first balls that are slidably connected to the steel pipe and the sleeve wall.

[0009] Furthermore, flanges are provided at both ends of the sleeve, and second guide rods that are slidably connected to the flanges are fixed at equal intervals inside the casing. A second spring is installed on the outer side of the second guide rods between the inner wall of the casing and the flanges.

[0010] Furthermore, the second buffer assembly includes a retainer fixed to one side of the movable ring, and the retainer is slidably connected to a second movable column at equal intervals in the circumference. A fourth spring is installed inside the second movable column to move the second movable column toward the steel pipe, and a second ball bearing is provided at the connection between the second movable column and the steel pipe.

[0011] Furthermore, a through groove is provided on the frame, and a support slider is fixed on the movable ring, with the support slider slidably connected to the through groove.

[0012] Furthermore, a motor is fixed to the upper end of the chassis, a drive wheel is installed at the output end of the motor, a driven wheel is fixedly sleeved on the outside of the main shaft sleeve, and a transmission belt is installed between the driven wheel and the drive wheel.

[0013] Furthermore, the chuck assembly includes: a rear cover; a disc body, disposed on one side of the rear cover and connected to the rear cover by bolts, having radially arranged grooves on the disc body, the disc body having chuck claws, and connecting sliders slidably connected to the grooves mounted on the chuck claws.

[0014] Furthermore, a small bevel gear is rotatably mounted on the inner wall of the rear cover, and a large bevel gear that meshes with the small bevel gear is rotatably mounted inside the disc body. A spiral groove is provided on the back side of the large bevel gear, and a locking tooth that matches the spiral groove is mounted on the connecting slider.

[0015] In addition, the present invention also provides a method of using a rotating clamping device for medium-diameter fluid transportation seamless steel pipes, the device comprising the following steps: Step 1: Install the steel pipe between the two chuck assemblies; Step 2: Start the motor to make the drive wheel rotate through the transmission belt, so that the main shaft sleeve and one of the chuck assemblies rotate synchronously, further rotating the steel pipe.

[0016] The present invention has the following beneficial effects: (1) The rotating clamping device and method for medium-diameter fluid transport seamless steel pipes uses double-row cylindrical self-aligning bearings as the support of the main shaft sleeve, realizing the passive self-alignment of the main shaft sleeve. This allows the chuck assembly at the drive end to follow the instantaneous rotation axis of the actual bending change of the steel pipe in real time, rather than forcing the workpiece to conform to the theoretical axis of the equipment. This solves the problems of helical contact between the chuck and the surface of the steel pipe, local stress concentration, and periodic pulsation attenuation of clamping force caused by forced alignment under traditional rigid clamping. It ensures from the source that the chuck and the outer edge of the steel pipe always maintain stable and uniform surface contact during the initial clamping and rotation process, thereby locking the initial clamping force and eliminating axial movement.

[0017] (2) The seamless steel pipe rotary clamping device for medium-diameter fluid transportation and its usage method. The structure can sensitively detect unnecessary swaying of the spindle sleeve caused by external interference or workpiece imbalance. Through the interaction between the displacement of the counterweight and the restoring force of the spring, a damping torque opposite to the swaying direction is automatically generated. Without the need for external sensors or controllers, the swaying energy can be consumed in real time and the vibration amplitude can be suppressed. This not only enhances the dynamic stability of the spindle sleeve in the self-adjusting process, but also transmits the spindle status information to the second buffer component through the linkage of the connecting rod and the movable ring, providing a synergistic effect for the overall stable control of the equipment.

[0018] (3) The rotating clamping device for medium-diameter fluid transport seamless steel pipe and its usage method, the first buffer component surrounds the outer periphery of the main shaft sleeve, and through multiple first movable columns with spring damping and the first balls on them, it forms a radial elastic wrapping and vibration energy dissipation on the main shaft sleeve. The second buffer component is located in the middle of the steel pipe, forming a flexible "clamp" that can move axially, effectively absorbing and isolating the composite vibration caused by the bending and rotation of the steel pipe, cutting force impact, etc., and significantly improving the dynamic stiffness and stability of the steel pipe in the entire processing process.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the chuck assembly and the support frame in this invention; Figure 3 This is a schematic diagram of the connection structure between the chuck assembly and the chassis in this invention; Figure 4 This is a schematic diagram of the internal structure of the chassis in this invention; Figure 5 In this invention Figure 4 The main view; Figure 6 This is a schematic diagram of the mounting structure of the spindle sleeve in this invention; Figure 7 This is a schematic diagram of the damping structure in this invention; Figure 8 In this invention Figure 7 The main view; Figure 9 This is a schematic diagram of the installation structure of the sleeve in this invention; Figure 10 In this invention Figure 9 Side view; Figure 11 This is a schematic diagram of the structure of the second buffer component in this invention; Figure 12 This is an exploded view of the chuck assembly in this invention; Figure 13 In this invention Figure 12 Another perspective view; Figure 14 This is a schematic diagram of the structure of the first movable column in this invention.

[0021] In the diagram, 1. Frame; 2. Steel pipe; 3. Chassis; 4. Support frame; 5. Chuck assembly; 51. Rear cover; 52. Disc body; 53. Slide groove; 54. Claw; 55. Connecting slider; 56. Claw tooth; 57. Large bevel gear; 58. Small bevel gear; 59. Spiral groove; 6. Motor; 7. Driving wheel; 8. Driven wheel; 9. Transmission belt; 10. Annular fixed frame; 11. Movable ring; 12. Support slider; 13. Through groove; 14. Cage; 15. Annular groove; 16. Rotary ring; 17. Connecting rod; 18. First guide rod; 19. Counterweight; 20. First spring; 21. Main shaft sleeve; 22. Sleeve; 23. Double row cylindrical self-aligning bearing; 24. Second guide rod; 25. Second spring; 26. First movable column; 27. Third spring; 28. Second movable column. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] The following is based on Figure 1 - Figure 14 This invention describes the rotating clamping device for medium-diameter fluid transport of seamless steel pipes and its usage method provided in the embodiments of the present invention.

[0025] Please refer to Figure 1 - Figure 14 This invention provides a technical solution: a rotating clamping device for seamless steel pipes used in medium-diameter fluid transportation, comprising a frame 1, a steel pipe 2, a housing 3, and a support frame 4. The support frame 4 and the housing 3 are respectively installed at both ends of the frame 1, and a chuck assembly 5 is coaxially rotatably connected to the housing 3 and the support frame 4. The chuck assembly 5 is used to fix both ends of the steel pipe 2. The frame 1 provides a stable installation foundation for the entire system, ensuring that the installation reference planes of the two chuck assemblies 5 are at the same level and the axes are aligned. This is the primary condition for achieving high-speed and stable rotation of the steel pipe 2. The support frame 4 mainly undertakes the functions of static support and axial positioning.

[0026] Due to the large weight and tangential force of the steel pipe 2, the tangential force generated during rotation will cause a decrease in the coaxiality between the steel pipe 2 and the chuck assembly 5. Therefore, the seamless steel pipe rotary clamping device for medium-diameter fluid transport provided in this solution also includes double-row cylindrical self-aligning bearings 23. The double-row cylindrical self-aligning bearings 23 are installed on both sides of the housing 3. A main shaft sleeve 21 is installed between the inner rings of the two double-row cylindrical self-aligning bearings 23. One end of the main shaft sleeve 21 is fixed to the chuck assembly 5 near the housing 3. The double-row cylindrical self-aligning bearings 23 consist of two symmetrical rows... The bushing consists of drum-shaped rollers, a shared spherical raceway on the outer ring, double-tilted raceways on the inner ring, and a retainer. The outer ring raceway is spherical, while the inner ring raceway has a tilted design. The drum-shaped rollers optimize load distribution. When the main bushing 21 deflects due to load, the centerlines of the inner and outer rings tilt relative to each other. The spherical raceway of the outer ring contacts the spherical surface of the drum-shaped rollers, allowing the drum-shaped rollers to automatically adjust their position within the raceway to compensate for angular errors. The two rows of symmetrical drum-shaped rollers can withstand heavy radial loads and bidirectional axial loads, making them more suitable for impact and vibration environments. In practical use, the bending caused by the tangential force on the steel pipe 2 will cause the reaction force acting on the chuck assembly 5 to change along the axis, forming different axial torques. This torque will be transmitted to the double-row cylindrical self-aligning bearing 23 through the chuck assembly 5 and the main shaft sleeve 21. The structure of the double-row cylindrical self-aligning bearing 23 will, under the condition of ensuring the strength of the equipment, cause the inner ring of the double-row cylindrical self-aligning bearing 23 to automatically yield along the direction of the torque, thereby driving the axis of the main shaft sleeve 21 and the chuck assembly 5 to automatically adjust until they are coaxial with the steel pipe 2. This ensures surface contact between the chuck assembly 5 and the clamping surface of the steel pipe 2, guaranteeing the initial clamping force. Since there are two sets of double-row cylindrical self-aligning bearings 23, respectively located at both ends of the main sleeve 21, their load-bearing capacity and self-aligning ability are improved. In addition, the other end of the main sleeve 21 extends to the outside of the machine housing 3 and is equipped with a damping structure. The damping structure is used to reduce the swing of the main sleeve 21, so that the tilting swing amplitude generated by the main sleeve 21 under the action of the double-row cylindrical self-aligning bearings 23 is further reduced, thereby further improving the stability of the steel pipe 2 and the processing effect.

[0027] It should be noted that the double-row cylindrical self-aligning bearing 23 provides an "adaptive following" effect. When the long steel pipe 2 undergoes elastic bending due to its own weight or cutting force, its actual rotation axis will deviate from the theoretical geometric axis, resulting in dynamic misalignment. At this time, the force transmitted to the main sleeve 21 through the chuck assembly 5 is not a pure radial force, but a torque that causes the main sleeve 21 to follow the deviation. Under the action of this torque, the inner ring of the double-row cylindrical self-aligning bearing 23 can make a small angular displacement around the center of the sphere, thereby driving the entire main sleeve 21 and chuck assembly 5 to produce "passive self-alignment", so that the axis of its clamping port follows the instantaneous rotation axis of the steel pipe 2 after actual bending in real time. This adaptive capability fundamentally solves the problems of local stress concentration, uneven clamping force, and even slippage caused by forced alignment under rigid support, ensuring the reliability and accuracy of clamping under complex working conditions.

[0028] In addition, the seamless steel pipe rotary clamping device for medium-diameter fluid transportation provided in this embodiment also includes a first buffer assembly. The first buffer assembly is located inside the housing 3 and is used to help reduce the swing of the spindle sleeve 21, thereby improving the stability of the steel pipe 2 and improving its processing accuracy. The first buffer assembly is a supplement and optimization to the self-aligning function of the double-row cylindrical self-aligning bearing 23. It mainly suppresses the low-frequency swing or vibration that may occur in the spindle sleeve 21 during the self-aligning process. It does not interfere with the normal self-aligning angle compensation of the double-row cylindrical self-aligning bearing 23. Instead, it absorbs and dissipates the extra swing energy caused by sudden load changes or external interference through the internal elastic damping element, making the dynamic response of the spindle system smoother and further improving the stability under precision machining conditions.

[0029] like Figure 4 , Figure 5 , Figure 6 , Figure 7 Figure 8 and Figure 11As shown, the damping structure provided in this embodiment includes an annular fixed frame 10, a movable ring 11, and a second buffer assembly. The annular fixed frame 10 is fixed to the other end of the main shaft sleeve 21, and first guide rods 18 are installed on it at equal intervals. The first guide rods 18 are arranged circumferentially on the annular fixed frame 10, and the first guide rods 18 are perpendicular to the axial direction of the main shaft sleeve 21. A counterweight 19 is slidably installed on the first guide rod 18, and a limiting plate is provided at the end of the first guide rod 18 away from the main shaft sleeve 21. A first spring 20 is installed on the outer side of the first guide rod 18 between the counterweight 19 and the end of the first guide rod 18. The first spring 20 is used to drive the counterweight 19 to slide towards the annular fixed frame 10. Specifically, when the main shaft sleeve 21 rotates, the counterweight 19 is subjected to centrifugal force and moves away from the main shaft sleeve 21. When the main shaft sleeve 21 wobbles under the action of the double-row cylindrical self-aligning bearing 23, the main shaft sleeve 21 is equivalent to centrifugal motion, causing the counterweight 19 to produce The instantaneous centrifugal force increases, causing the counterweight 19 to move further away from the main shaft sleeve 21. The first spring 20 resists the counterweight 19 moving away from the main shaft sleeve 21, thereby resisting the swaying of the main shaft sleeve 21 and improving the stability of the main shaft sleeve 21. To further resist the counterweight 19 moving away from the main shaft sleeve 21, the movable ring 11 in this solution is installed on one side of the annular fixed frame 10, and an annular groove 15 is provided on it. A rotating ring 16 is provided in the annular groove 15. The rotating ring 16 can swing and rotate inside the annular groove 15. A connecting rod 17 is hinged between the rotating ring 16 and the counterweight 19. The second buffer assembly is provided on one side of the movable ring 11 to reduce the shaking of the steel pipe 2. When the counterweight 19 moves away from the main shaft sleeve 21, the connecting rod 17 can pull the rotating ring 16 and the movable ring 11 to slide towards the annular fixed frame 10, thereby moving the second buffer assembly towards the annular fixed frame 10. The second buffer assembly forms a lever structure on the steel pipe 2 to reduce the shaking of the steel pipe 2.

[0030] When the main sleeve 21 rotates at a constant speed, each counterweight 19 reaches equilibrium under the centrifugal force and the preload of the first spring 20, and is in a reference position. When the main sleeve 21 wobbles due to external interference (such as the unbalance of the steel pipe 2 or the fluctuation of the cutting force), its rotation axis will momentarily shift, causing a slight change in the rotation radius and tangential velocity of the counterweight 19, thereby disrupting the original centrifugal force balance. The counterweight 19 will therefore generate additional displacement. This displacement is converted into an axial tension on the movable ring 11 through the connecting rod 17 and the rotating ring 16. The inertial force feedback generated by the displacement of the counterweight 19 is always opposite to the direction of the wobbling of the main sleeve 21, thereby forming a damping torque to suppress the wobbling.

[0031] like Figure 4 - Figure 10 and Figure 14As shown, the first buffer assembly provided in this embodiment includes a sleeve 22 and a first movable column 26. The sleeve 22 is fitted onto the outside of the main bushing 21 and is slidably connected along the axial direction of the main bushing 21. The first movable column 26 is circumferentially arranged on the outside of the main bushing 21 and is slidably connected to the main bushing 21. A third spring 27 is installed inside the first movable column 26. It should be noted that a first damping pad is installed at the connection between the first movable column 26 and the main bushing 21 to convert the elastic potential energy inside the third spring 27 into heat energy for heat dissipation. The third spring 27 is used to drive the first movable column 26 to move toward the steel pipe 2, and both ends of the first movable column 26 are provided with rolling connections to the steel pipe 2 and the wall of the sleeve 22. When the first ball bearing is connected to the main shaft sleeve 21 swings, the third spring 27 will deform, thereby converting the elastic potential energy into the heat energy of the damping pad, thus reducing the swing of the steel pipe 2. In addition, in order to facilitate the clamping of steel pipes 2 with synchronous diameter, the first movable column 26 provided in this embodiment is a telescopic structure, which mainly consists of a telescopic sleeve and a telescopic tube. An adjusting spring is installed in the telescopic sleeve at one end to adjust the actual length of the entire first movable column 26. In order to facilitate the insertion and installation of the steel pipe 2, a conical cover can be installed at one end of the steel pipe 2. The maximum outer diameter of the conical cover is the same as the outer diameter of the steel pipe 2. The structural characteristics of the conical cover are used to break the gap formed by the first movable column 26.

[0032] It should be further explained that the first buffer assembly forms a floating elastic support ring structure surrounding the main shaft sleeve 21, providing a flexible and energy-dissipating support effect in the radial direction. When the main shaft sleeve 21 swings radially, it will squeeze or relax the first movable column 26 in the corresponding direction. The third spring 27 is compressed or stretched, and its stored elastic potential energy is then dissipated by the first damping pad through friction into heat energy, thereby rapidly attenuating the swing energy. The first ball converts sliding friction into rolling friction, which greatly reduces the motion resistance between the main shaft sleeve 21 and the buffer assembly, avoiding interference with the self-aligning motion of the main shaft sleeve 21 or generating additional vibration due to friction. The cooperation between the retractable first movable column 26 and the conical cover allows the buffer assembly to adapt to steel pipes 2 of different diameters within a certain range. When the steel pipe 2 is inserted, it can be automatically opened and then reset and tightened, realizing quick changeover and automatic centering assistance, enhancing the versatility and ease of operation of the equipment.

[0033] like Figure 4 , Figure 5 and Figure 9As shown, to ensure the stability of the sleeve 22, flanges are provided at both ends of the sleeve 22 provided in this embodiment. Second guide rods 24, which are slidably connected to the flanges, are fixed at equal intervals inside the housing 3. A second spring 25 is installed on the outer side of the second guide rod 24 between the inner wall of the housing 3 and the flange. A second damping pad is installed at the connection between the flange and the second guide rod 24. When the main sleeve 21 rotates, since double-row cylindrical self-aligning bearings 23 are provided at both ends, the main sleeve 21 will first tilt and then become horizontal during the self-aligning process. During this process, when the first ball rotates with the sleeve 22, the sleeve 22 will have a lateral displacement. The second spring 25 and the second damping pad maintain the stability of the sleeve 22 during the lateral displacement, thereby resisting the sway amplitude of the main sleeve 21 and improving the stability and accuracy of the steel pipe 2 processing.

[0034] The sleeve 22 is connected to the second guide rod 24 via a flange, allowing it to move radially along the main sleeve 21. The second spring 25 provides it with a restoring elastic force. When the first movable column 26 is squeezed by the main sleeve 21 and transmits the force to the sleeve 22, the sleeve 22 undergoes radial displacement and compresses the second spring 25. At the same time, the second damping pad begins to consume energy, not only directly absorbing part of the vibration energy transmitted from the main sleeve 21, but also, due to its own inertial mass and elasticity, producing an anti-phase cancellation effect on vibrations of a specific frequency. This significantly reduces the vibration transmitted to the chassis 3 and frame 1, improving the overall stability of the equipment.

[0035] like Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 10 As shown, to reduce the vibration of the steel pipe 2, the second buffer assembly provided in this embodiment includes a retainer 14 fixed to one side of the movable ring 11. The retainer 14 is slidably connected with a second movable column 28 at equal intervals around its circumference. A fourth spring is installed inside the second movable column 28 to allow the second movable column 28 to move toward the steel pipe 2. A second ball bearing is provided at the connection between the second movable column 28 and the steel pipe 2. It should be noted that a third damping pad is installed at the connection between the second movable column 28 and the retainer 14. When the steel pipe 2 vibrates, the second movable column 28 will be pushed by the steel pipe 2 and displaced, causing the fourth spring to deform. The third damping pad is used to eliminate the elastic potential energy of the fourth spring, thereby maintaining the stability of the steel pipe 2.

[0036] The second buffer assembly operates on a similar principle to the first buffer assembly, but at a different point of application. It is located in the area between the support points of the two chuck assemblies 5, which is the location where the steel pipe 2 experiences maximum amplitude due to bending vibration. Through multiple circumferentially arranged second movable columns 28, a flexible and damped "clamp" structure is formed on the surface of the steel pipe 2. When the steel pipe 2 rotates and undergoes flexural vibration, the vibration displacement will push the second movable columns 28, and the fourth spring and third damping pad inside them will immediately work to absorb the vibration energy.

[0037] like Figure 3 and Figure 4 As shown, in order to maintain the stability of the movable ring 11 and enable the movable ring 11 to move horizontally along the axial direction of the steel pipe 2, the seamless steel pipe rotary clamping device for medium-diameter fluid transportation provided in this embodiment has a through groove 13 on the frame 1, and a support slider 12 is fixed on the movable ring 11. The support slider 12 is slidably connected to the through groove 13, so that the movable ring 11 can only move along the axial direction of the frame 1, thus ensuring the stability of the damping structure.

[0038] like Figure 1 and Figure 3 As shown, in order to drive the main shaft sleeve 21, this solution has a motor 6 fixed on the upper end of the housing 3, a drive wheel 7 installed at the output end of the motor 6, a driven wheel 8 fixedly sleeved on the outside of the main shaft sleeve 21, and a transmission belt 9 installed between the driven wheel 8 and the drive wheel 7. The motor 6 drives the drive wheel 7 to rotate, and the transmission belt 9 drives the driven wheel 8 to rotate synchronously with the drive wheel 7, thereby driving the main shaft sleeve 21 to rotate, and further driving the chuck assembly 5 to drive the steel pipe 2 to rotate.

[0039] like Figure 12 and Figure 13 As shown, the chuck assembly 5 provided in this embodiment includes a rear cover 51 and a disc body 52. ​​The disc body 52 is located on one side of the rear cover 51, and the disc body 52 is connected to the rear cover 51 by bolts. It has three sets of radially arranged sliding grooves 53. The disc body 52 has chucks 54, and connecting sliders 55 that slidably connect with the sliding grooves 53 are mounted on the chucks 54. Additionally, a small bevel gear 58 is rotatably mounted on the inner wall of the rear cover 51, and a large bevel gear 57 that meshes with the small bevel gear 58 is rotatably mounted inside the disc body 52. ​​The large bevel gear 57 has a back... The side is provided with a spiral groove 59, and the connecting slider 55 is equipped with a locking tooth 56 that is adapted to the spiral groove 59. Specifically, in operation, by driving one of the small bevel gears 58 to rotate, the meshing between the small bevel gear 58 and the large bevel gear 57 causes the large bevel gear 57 to rotate, which in turn causes the spiral groove 59 to rotate synchronously. Through the cooperation between the spiral groove 59 and the locking tooth 56, the locking tooth 56 pushes the connecting slider 55 to slide inside the slide groove 53, which in turn drives the pawl 54 to move so that the pawl 54 can clamp the steel pipe 2.

[0040] In use (operation), first install a conical cover on one end of the steel pipe 2, and then pass the conical cover on the steel pipe 2 through the two chuck assemblies 5 in sequence, driving one of the small bevel gears 58 to rotate. The meshing between the small bevel gear 58 and the large bevel gear 57 causes the large bevel gear 57 to rotate, which in turn causes the spiral groove 59 to rotate synchronously. Through the cooperation between the spiral groove 59 and the chuck tooth 56, the chuck tooth 56 pushes the connecting slider 55 to slide inside the slide groove 53, which in turn drives the chuck 54 to move so that the chuck 54 clamps the steel pipe 2. Start the motor 6, which drives the drive wheel 7 to rotate. The drive wheel 8 rotates synchronously with the drive wheel 7 via the transmission belt 9, thereby driving the main shaft sleeve 21 to rotate, which in turn drives the chuck assembly 5 to rotate the steel pipe 2.

[0041] When the steel pipe 2 undergoes elastic bending due to its own weight or cutting force, its actual axis of rotation will deviate from the theoretical geometric axis, resulting in dynamic misalignment. At this time, the force transmitted to the main sleeve 21 through the chuck assembly 5 is not a pure radial force, but a torque that causes the main sleeve 21 to follow the deviation. Under the action of this torque, the inner ring of the double-row cylindrical self-aligning bearing 23 can make a small angular displacement around the center of the sphere, thereby driving the entire main sleeve 21 and chuck assembly 5 to produce "passive self-alignment", so that the axis of its clamping port follows the instantaneous rotation axis of the steel pipe 2 after actual bending in real time.

[0042] When the main shaft sleeve 21 rotates at a constant speed, each counterweight 19 reaches equilibrium under the centrifugal force and the preload of the first spring 20, and is in a reference position. When the main shaft sleeve 21 wobbles due to external interference, its rotation axis will momentarily shift, causing slight changes in the rotation radius and tangential velocity of the counterweight 19, thereby disrupting the original centrifugal force balance. The counterweight 19 will therefore generate additional displacement. This displacement is converted into axial tension on the movable ring 11 through the connecting rod 17 and the rotating ring 16. The inertial force feedback generated by the displacement of the counterweight 19 is always opposite to the direction of the wobbling of the main shaft sleeve 21, thereby forming a damping torque to suppress the wobbling. At the same time, the second buffer assembly generates axial displacement synchronously with the movable ring 11 to adjust the position of the second buffer assembly. When the steel pipe 2 rotates and flexes, the vibration displacement will push the second movable column 28, and the fourth spring and the third damping pad inside it will immediately work to absorb the vibration energy.

[0043] The present invention also provides a method of using a rotating clamping device for medium-diameter fluid transport seamless steel pipes, which includes the following steps: Step 1: Install steel pipe 2 between the two chuck assemblies 5; Step 2: Start the motor 6 to make the drive wheel 7 drive the driven wheel 8 to rotate through the transmission belt 9, so that the main shaft sleeve 21 rotates synchronously with one of the chuck assemblies 5, and further rotates the steel pipe 2.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rotary clamp apparatus for seamless steel pipes for medium-caliber fluid transport, comprising a frame (1), a steel pipe (2), a machine case (3), and a support frame (4), characterized in that, Also include: Chuck assembly (5) is coaxial rotation mounted on the cabinet (3) and support frame (4), for fixing the two ends of the steel pipe (2); Double row cylindrical aligning bearing (23) is installed on both sides of the cabinet (3), and the inner ring of the two double row cylindrical aligning bearings (23) is provided with a main shaft sleeve (21), one end of the main shaft sleeve (21) is fixed with the chuck assembly (5) close to the cabinet (3), and the other end of the main shaft sleeve (21) extends to the outside of the cabinet (3) and is provided with a damping structure, and the damping structure is used for slowing down the swing of the main shaft sleeve (21); The first buffer assembly is arranged in the cabinet (3), which assists in slowing down the swing of the main shaft sleeve (21).

2. A rotary clamp apparatus for seamless steel pipe for medium-bore fluid transport according to claim 1, characterized in that, The damping structure comprises: Annular fixing frame (10) is fixed to the other end of the main shaft sleeve (21), and first guide rod (18) is installed on the annular fixing frame (10) at equal intervals, counterweight (19) is slidably installed on the first guide rod (18), and first spring (20) is installed between the outer side of the first guide rod (18) and the port of the counterweight (19), and the first spring (20) is used for driving the counterweight (19) to slide towards the direction of the annular fixing frame (10); The movable ring (11) is installed on one side of the annular fixing frame (10), and the movable ring (11) is provided with an annular groove (15), and the annular groove (15) is provided with a rotating ring (16), and the rotating ring (16) and the counterweight (19) are hinged with a connecting rod (17); The second buffer assembly is arranged on one side of the movable ring (11), which is used for slowing down the swing of the steel pipe (2).

3. A rotary clamp apparatus for seamless steel pipe for medium-bore fluid transport according to claim 2, characterized in that, The first buffer assembly comprises: Sleeve (22) is sleeved on the outer side of the main shaft sleeve (21), and is axially slidably connected along the main shaft sleeve (21); The first movable column (26) is circumferentially arranged on the outer side of the main shaft sleeve (21), and the first movable column (26) is slidably connected with the main shaft sleeve (21), the third spring (27) is installed in the first movable column (26), the third spring (27) is used for driving the first movable column (26) to move towards the steel pipe (2), and the first movable column (26) is provided with first ball which is rolling connected with the pipe wall of the steel pipe (2) and the sleeve (22) at both ends.

4. A rotary clamp apparatus for seamless steel pipe for medium-bore fluid transport according to claim 3, characterized in that, The sleeve (22) is provided with a flange plate at both ends, and the cabinet (3) is fixed with a second guide rod (24) which is slidably connected with the flange plate at equal intervals, and the second spring (25) is installed between the outer side of the second guide rod (24) and the inner wall of the cabinet (3).

5. A rotary clamp apparatus for seamless steel pipe for medium-bore fluid transport according to claim 4, characterized in that, The second buffer assembly comprises a retainer (14) fixed to one side of the movable ring (11), and the retainer (14) is circumferentially and equally spaced slidably connected with a second movable column (28), and the fourth spring is installed in the second movable column (28) to make the second movable column (28) move towards the steel pipe (2), and the second movable column (28) is provided with a second ball at the connection with the steel pipe (2).

6. A rotating clamp apparatus for seamless steel pipe for medium-bore fluid transport according to claim 5, characterized in that, The rack (1) is provided with a through slot (13), and the movable ring (11) is fixed with a supporting sliding block (12), and the supporting sliding block (12) is slidably connected with the through slot (13).

7. A rotating clamp apparatus for seamless steel pipes for medium caliber fluid transport according to any one of claims 1 to 6, characterized in that, The machine case (3) upper end is fixed with motor (6), the motor (6) output end is installed with driving wheel (7), the main shaft sleeve (21) outside is fixedly sleeved with driven wheel (8), and the driven wheel (8) is installed with transmission belt (9) between driving wheel (7).

8. A rotary clamp apparatus for seamless steel pipe for medium-bore fluid transport according to claim 7, characterized by The chuck assembly (5) comprises: A rear cover (51); A disc body (52) is arranged on one side of the rear cover (51) and connected to the rear cover (51) by bolts, and a sliding groove (53) is arranged on the disc body (52) in the radial direction. The disc body (52) is provided with a jaw (54), and the jaw (54) is provided with a connecting sliding block (55) which is in sliding connection with the sliding groove (53).

9. A rotating clamp apparatus for seamless steel pipe for medium-bore fluid transport according to claim 8, characterized in that, The rear cover (51) is rotatably installed with a small bevel gear (58) on the inner wall, and the disc body (52) is rotatably installed with a large bevel gear (57) which is in meshing connection with the small bevel gear (58). The large bevel gear (57) is provided with a spiral groove (59) on the back side, and the connecting sliding block (55) is provided with a pawl (56) which is matched with the spiral groove (59).

10. A method of using a rotary clamp apparatus for seamless steel pipes for medium-caliber fluid transport, characterized in that, The rotating clamping device for the seamless steel pipe for medium-caliber fluid conveying according to any one of claims 1-9 comprises the following steps: Step one: install the steel pipe (2) between the two chuck assemblies (5); Step two: start the motor (6) to make the driving wheel (7) rotate through the transmission belt (9) to drive the driven wheel (8) to rotate, so that the main shaft sleeve (21) rotates synchronously with one of the chuck assemblies (5), and further makes the steel pipe (2) rotate.

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