A precision straightening device for seamless steel pipes

Abstract

This utility model discloses a precision straightening device for seamless steel pipes, including two sets of clamping seats located at the ends of the seamless steel pipes. The clamping seats are rotatably mounted on clamping plates via connecting shafts. The two sets of clamping plates are movably arranged within a base frame. The base frame is equipped with a position adjustment component for moving the two sets of clamping plates in opposite directions and a synchronous drive component for rotating the clamping seats. This utility model installs the clamping seats using two sets of clamping plates, using the clamping seats to fix the steel pipe from the inside of both ends, determining the center pull direction of the steel pipe. Then, the clamping components inside the fixed frame are used to synchronously adjust the two sets of movable seats in opposite directions, always maintaining the same vertical distance between the straightening wheels at the upper and lower positions and the line connecting the two sets of clamping seats. When the straightening wheels clamp and limit the steel pipe, the center pull of the position to be straightened can be made coaxial with the center of the clamping seat. After the fixed frame moves left and right, the steel pipe can be quickly straightened.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe straightening technology, specifically to a precision straightening device for seamless steel pipes. Background Technology

[0002] Steel pipe straightening is a key process that uses external force to eliminate bending and internal stress, thereby achieving a specified straightness. It is widely used in fields such as petroleum and machinery manufacturing. Insufficient straightness of steel pipes can easily lead to twisting and deformation of the pipeline, threatening safe use.

[0003] In the prior art, Chinese invention publication CN119566107A discloses a precision straightening device and method for thin-walled seamless steel pipes, specifically relating to the field of steel pipe straightening technology. The device includes a straightening worktable with a concave groove on one side of its outer end. A bottom support plate is provided at the lower end of the straightening worktable, and a support crossbar is provided in the middle of the upper part of the bottom support plate. A fixed support block and a bottom straightening support block are provided on one side of the upper part of the straightening worktable. In practical use, by correspondingly arranging the support slider, small motor, bidirectional lead screw, pipe support block, and support groove, the spacing of the pipe support block can be adjusted by the small motor, thus facilitating the support of thin-walled steel pipes of different diameters and increasing the stability of the pipe support block movement. Furthermore, by correspondingly arranging the second electric telescopic rod, adjusting support plate, adjusting roller, and concave adjusting groove, the adjusting support plate can be raised and lowered by the second electric telescopic rod.

[0004] In the above technical solution, before straightening pipes of different sizes, the positions of the pipe support blocks need to be adjusted to fit the steel pipes of different sizes to be straightened, ensuring that the bottom of the steel pipe fits the groove on the top of the straightening support pad. However, the steel pipe is in a bent state before processing, and it cannot be guaranteed that the steel pipe is in contact with the straightening support pad. This will cause the center of both ends of the steel pipe in the clamped state to be out of sync with the center of the groove on the top of the straightening support pad, thus affecting the supporting effect of the straightening support pad. When the straightening pressing block presses down on the steel pipe, the bottom of the steel pipe may be unsupported and swing to the other side, thus affecting the straightening efficiency of the steel pipe. Utility Model Content

[0005] The purpose of this invention is to provide a precision straightening device for seamless steel pipes.

[0006] The technical problem solved by this utility model is the low efficiency of traditional steel pipe straightening.

[0007] This utility model can be achieved through the following technical solutions:

[0008] A precision straightening device for seamless steel pipes includes two sets of clamping seats located at the ends of the seamless steel pipes. The clamping seats are rotatably mounted on clamping plates via connecting shafts. The two sets of clamping plates are movably arranged within a base frame. The base frame is provided with a position adjustment component for moving the two sets of clamping plates toward each other and a synchronous drive component for rotating the clamping seats.

[0009] Preferably, the base frame has through slots on its front and rear sides, and a movable frame is slidably arranged in the through slots. The front and rear ends of the movable frame extend to the outside of the base frame and are fixed with a fixing frame. The inner cavity of the movable frame is provided with a moving component that drives the movable frame to move left and right in the through slots. The inner cavity of the fixing frame is movably arranged with two sets of movable seats located on the upper and lower sides of the seamless steel pipe. A straightening wheel is rotatably installed in the movable seat. The fixing frame is provided with a clamping component for adjusting the distance between the two sets of movable seats.

[0010] Preferably, the position adjustment assembly includes a first bidirectional screw rotatably connected to the inner cavity of the base frame, two sets of clamping plates respectively threaded to the two ends of the first bidirectional screw, a first servo motor fixed to one end of the base frame, and the output shaft of the first servo motor fixedly connected to one end of the first bidirectional screw.

[0011] Preferably, the synchronous drive assembly includes a drive shaft rotatably connected to the inner cavity of the base frame via bearings. Two sets of limiting strips are fixed on the drive shaft. A drive synchronous wheel is slidably arranged on the outer side of the drive shaft and the limiting strips. The drive synchronous wheel is rotatably connected to one side of the clamping plate via bearings. A driven synchronous wheel is fixed at the end of the connecting shaft away from the clamping seat. A synchronous belt is drivingly connected to the outer side of the drive synchronous wheel and the driven synchronous wheel. A second servo motor is fixed at one end of the base frame. The output shaft of the second servo motor is fixedly connected to one end of the drive shaft. A through hole is provided on the clamping plate for the drive shaft to pass through.

[0012] Preferably, the moving component includes two sets of rotating shafts rotatably connected to the inner cavity of the movable frame via bearings. Two sets of drive gears are fixed to the outer side of the rotating shafts. A rack plate that meshes with the drive gears is fixed to the bottom of the inner cavity of the through slot. A third servo motor is fixed to the outer side of the fixed frame. The output shaft of the third servo motor passes through the inner cavity of the movable frame and is fixedly connected to one end of one set of rotating shafts.

[0013] Preferably, the clamping assembly includes movable slots formed on the front and rear sides of the inner cavity of the fixed frame. Fixed blocks that are slidably disposed in the movable slots are fixed at both ends of the movable seat. A second bidirectional screw is threadedly connected to the center of the fixed block. The two ends of the second bidirectional screw are rotatably connected to the fixed frame through bearings. A fourth servo motor is fixed to the top of the fixed frame through a mounting bracket. A drive pulley is fixed to the output shaft of the fourth servo motor. The top of the second bidirectional screw extends through to the top of the fixed frame and is fixed to a driven pulley. The drive pulley and the driven pulley are connected by a transmission belt.

[0014] Preferably, a protrusion is fixed on the outer side of the clamping plate, and a guide groove is provided in the inner cavity of the base frame, with the protrusion slidably disposed in the guide groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model uses two sets of clamping plates to install the clamping seats. The clamping seats fix the steel pipe from the inside of both ends of the steel pipe, determine the center pull direction of the steel pipe, and then use the clamping components inside the fixed frame to adjust the two sets of movable seats synchronously in opposite directions. Always keep the vertical distance between the straightening wheel in the upper and lower positions and the line connecting the two sets of clamping seats the same. When the straightening wheel clamps and limits the steel pipe, it can make the center pull of the position to be straightened coaxial with the center of the clamping seat. After the fixed frame moves left and right, the bent parts of the steel pipe can be quickly straightened.

[0017] 2. This utility model clamps and fixes the steel pipe from the inside of both ends of the steel pipe through the clamping seat. This not only maintains the stability of the steel pipe shape, but also ensures that the steel pipe can rotate around the central axis, which is convenient for straightening processing. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0020] Figure 2 This is a cross-sectional three-dimensional structural connection diagram of the base frame of this utility model;

[0021] Figure 3 This is a side view cross-sectional three-dimensional structural connection diagram of the base frame and the movable frame of this utility model;

[0022] Figure 4 This is a three-dimensional structural connection diagram of the clamping plate of this utility model.

[0023] In the diagram: 1. Clamping seat; 2. Clamping plate; 3. Base frame; 4. Position adjustment assembly; 41. First bidirectional screw; 42. First servo motor; 5. Synchronous drive assembly; 51. Drive shaft; 52. Limiting bar; 53. Drive synchronous pulley; 54. Driven synchronous pulley; 55. Synchronous belt; 56. Second servo motor; 6. Movable frame; 7. Fixed frame; 8. Moving assembly; 81. Rotating shaft; 82. Drive gear; 83. Rack plate; 84. Third servo motor; 9. Movable seat; 10. Straightening wheel; 11. Clamping assembly; 111. Moving groove; 112. Fixed block; 113. Second bidirectional screw; 114. Fourth servo motor; 115. Drive pulley; 116. Driven pulley; 12. Protrusion; 13. Guide groove. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0025] Please see Figure 1-4 As shown, a precision straightening device for seamless steel pipe includes two sets of clamping seats 1 located at the ends of the seamless steel pipe. The clamping seats 1 are arranged in a stepped shape. The clamping seats 1 are rotatably mounted on the clamping plates 2 via connecting shafts. The two sets of clamping plates 2 are movably arranged in the base frame 3. The base frame 3 is provided with a position adjustment component 4 for moving the two sets of clamping plates 2 in opposite directions and a synchronous drive component 5 for rotating the clamping seats 1.

[0026] The base frame 3 has through slots on its front and rear sides, and a movable frame 6 is slidably installed in the through slots. The front and rear ends of the movable frame 6 extend to the outside of the base frame 3 and are fixed with a fixing frame 7. The inner cavity of the movable frame 6 is provided with a moving component 8 that drives the movable frame 6 to move left and right in the through slots. The inner cavity of the fixing frame 7 is provided with two sets of movable seats 9 located on the upper and lower sides of the seamless steel pipe. A straightening wheel 10 is rotatably installed in the movable seat 9. The outer contour of the straightening wheel 10 protrudes outward to avoid scratching the surface of the steel pipe during left and right movement. The fixing frame 7 is provided with a clamping component 11 for adjusting the distance between the two sets of movable seats 9. Pressure sensors are installed on both the straightening wheel 10 and the clamping seat 1 to detect pressure changes. A PLC controller is installed on the outside of the base frame 3. The PLC controller is electrically connected to the servo motor and the pressure sensor respectively.

[0027] The clamping seat 1 is installed by two sets of clamping plates 2. The clamping seat 1 fixes the steel pipe from the inside of both ends of the steel pipe to determine the center direction of the steel pipe. Then, the clamping component 11 inside the fixing frame 7 is used to adjust the two sets of movable seats 9 synchronously towards each other. The vertical distance between the straightening wheel 10 in the upper and lower positions and the line connecting the two sets of clamping seats 1 is always the same. When the straightening wheel 10 clamps and limits the steel pipe, the center of the position to be corrected can be made coaxial with the center of the clamping seat 1. After the fixing frame 7 moves left and right, the bent parts of the steel pipe can be quickly corrected.

[0028] Please see Figure 2 As shown, the position adjustment component 4 includes a first bidirectional screw 41 rotatably connected to the inner cavity of the base frame 3, two sets of clamping plates 2 respectively threaded to the two ends of the first bidirectional screw 41, a first servo motor 42 fixed to one end of the base frame 3, and the output shaft of the first servo motor 42 fixedly connected to one end of the first bidirectional screw 41. The first servo motor 42 drives the first bidirectional screw 41 to rotate, causing the two sets of clamping plates 2 to move towards each other, which can clamp and fix steel pipes of different lengths and maintain the stability of the steel pipe during straightening.

[0029] Please see Figure 2 and Figure 4 As shown, the synchronous drive assembly 5 includes a drive shaft 51 rotatably connected to the inner cavity of the base frame 3 via bearings. Two sets of limiting strips 52 are fixed on the drive shaft 51. A drive synchronous wheel 53 is slidably arranged on the outer side of the drive shaft 51 and the limiting strips 52. The drive synchronous wheel 53 is rotatably connected to one side of the clamping plate 2 via bearings. A driven synchronous wheel 54 is fixed at the end of the connecting shaft away from the clamping seat 1. A synchronous belt 55 is drivingly connected to the outer side of the drive synchronous wheel 53 and the driven synchronous wheel 54. A second servo motor 56 is fixed at one end of the base frame 3. The output shaft of the second servo motor 56 is fixedly connected to one end of the drive shaft 51. A through hole is provided on the clamping plate 2 for the drive shaft 51 to pass through.

[0030] This utility model uses a second servo motor 56 to drive the drive shaft 51 to rotate. Then, the drive shaft 51 drives the drive synchronous wheel 53 through the limit bar 52. At the same time, the limit bar 52 can be adjusted by moving left and right on the clamping plate 2, so that the drive shaft 51 always drives the drive synchronous wheel 53. The drive synchronous wheel 53 drives the driven synchronous wheel 54 and the connecting shaft to rotate through the synchronous belt 55. The connecting shaft drives the clamping seat 1, and works with the clamping plate 2 to clamp and drive the steel pipe, so that the steel pipe rotates around the central axis of the clamping seat 1.

[0031] Please see Figure 3As shown, the moving component 8 includes two sets of rotating shafts 81 rotatably connected to the inner cavity of the movable frame 6 via bearings. Two sets of drive gears 82 are fixed to the outer side of the rotating shafts 81. A rack plate 83 that meshes with the drive gears 82 is fixed to the bottom of the inner cavity of the through slot. A third servo motor 84 is fixed to the outer side of the fixed frame 7. The output shaft of the third servo motor 84 passes through the inner cavity of the movable frame 6 and is fixedly connected to one end of one set of rotating shafts 81. The third servo motor 84 drives one set of rotating shafts 81 to rotate. Then, the drive gears 82 on the rotating shafts 81 rotate and drive the movable frame 6 to move left and right in the through slot. Under the constraint of the other set of rotating shafts 81 and drive gears 82, the stability of the fixed frame 7 is maintained, and the fixed frame 7 is prevented from shaking due to uneven force.

[0032] Please see Figure 3 As shown, the clamping assembly 11 includes movable slots 111 formed on the front and rear sides of the inner cavity of the fixed frame 7. Fixed blocks 112, slidably disposed within the movable slots 111, are fixed at both ends of the movable seat 9. A second bidirectional screw 113 is threadedly connected to the center of the fixed block 112. The two ends of the second bidirectional screw 113 are rotatably connected to the fixed frame 7 via bearings. A fourth servo motor 114 is fixed to the top of the fixed frame 7 via a mounting bracket. A drive pulley 115 is fixed to the output shaft of the fourth servo motor 114. The second bidirectional screw 11... The top of 3 extends through to the top of the fixed frame 7 and is fixed with a driven pulley 116. The drive pulley 115 is connected to the driven pulley 116 via a transmission belt. The fourth servo motor 114 drives the drive pulley 115 to rotate. The drive pulley 115 drives the driven pulley 116 and the second bidirectional screw 113 to rotate via the transmission belt. The second bidirectional screw 113 moves the movable seat 9 towards each other via the drive fixed block 112, so that the straightening wheel 10 on the movable seat 9 clamps and straightens the steel pipe to maintain the straightness of the steel pipe.

[0033] Please see Figure 3-4 As shown, a protrusion 12 is fixed on the outer side of the clamping plate 2, and a guide groove 13 is provided in the inner cavity of the base frame 3. The protrusion 12 is slidably disposed in the guide groove 13. By utilizing the cooperation between the protrusion 12 and the guide groove 13, it is convenient to maintain the stability of the clamping plate 2 in the base frame 3, and prevent the clamping plate 2 from tilting when squeezed by the steel pipe, which would prevent the steel pipe from being effectively clamped and fixed.

[0034] In use, this invention first rough-processes the steel pipe with a large bending angle using other mechanical equipment to reduce the bending angle. Then, the steel pipe with a smaller bending angle is placed between two sets of clamping plates 2. The first servo motor 42 is started, driving the first bidirectional screw 41 to rotate. The first bidirectional screw 41 drives the two sets of clamping plates 2 to move towards the center within the base frame 3. The clamping plates 2 drive the clamping seats 1 to insert into both ends of the steel pipe, using the clamping seats 1 to fix the steel pipe. Then, the second servo motor 56 is started, driving the drive shaft 51 to rotate. The drive shaft 51 drives the drive synchronous wheel 53 to rotate using the limit bar 52. The drive synchronous wheel 53 drives the driven synchronous wheel 54 and the connecting shaft to rotate via the synchronous belt 55, thus driving the clamping seat 1 to rotate. Then, the clamping seat 1 drives the steel pipe to rotate, and then the fourth servo motor 114 is started. The fourth servo motor 114 drives the drive pulley 115 to rotate. The drive pulley 115 drives the driven pulley 116 and the second bidirectional screw 113 to rotate through the transmission belt. The second bidirectional screw 113 drives the movable seat 9 to clamp the steel pipe from the upper and lower sides through the fixed block 112, so that the straightening wheel 10 is in contact with the steel pipe. The compression of the straightening wheel 10 combined with the rotation of the steel pipe is used to straighten the steel pipe locally. Then, the third servo motor 84 drives the rotating shaft 81 to rotate. The rotating shaft 81 drives the drive gear 82 to rotate on the rack plate 83, so that the movable frame 6 and the fixed frame 7 can move left and right on the base frame 3, so as to facilitate the straightening of the steel pipe at different positions according to the bending position of the steel pipe.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A precision straightening device for seamless steel pipes, characterized in that: It includes two sets of clamping seats (1) located at the ends of seamless steel pipes. The clamping seats (1) are rotatably mounted on clamping plates (2) via connecting shafts. The two sets of clamping plates (2) are movably arranged in the base frame (3). The base frame (3) is provided with a position adjustment component (4) for moving the two sets of clamping plates (2) in opposite directions and a synchronous drive component (5) for rotating the clamping seats (1). The base frame (3) has through slots on its front and rear sides, and a movable frame (6) is slidably arranged in the through slots. The front and rear ends of the movable frame (6) extend to the outside of the base frame (3) and are fixed with a fixing frame (7). The inner cavity of the movable frame (6) is provided with a moving component (8) that drives the movable frame (6) to move left and right in the through slot. The inner cavity of the fixing frame (7) is movably provided with two sets of movable seats (9) located on the upper and lower sides of the seamless steel pipe. A straightening wheel (10) is rotatably installed in the movable seat (9). The fixing frame (7) is provided with a clamping component (11) for adjusting the distance between the two sets of movable seats (9).

2. The precision straightening device for seamless steel pipes according to claim 1, characterized in that, The position adjustment assembly (4) includes a first bidirectional screw (41) rotatably connected to the inner cavity of the base frame (3), two sets of clamping plates (2) are respectively threaded to the two ends of the first bidirectional screw (41), and a first servo motor (42) is fixed to one end of the base frame (3), and the output shaft of the first servo motor (42) is fixedly connected to one end of the first bidirectional screw (41).

3. The precision straightening device for seamless steel pipes according to claim 1, characterized in that, The synchronous drive assembly (5) includes a drive shaft (51) rotatably connected to the inner cavity of the base frame (3) via bearings. Two sets of limiting strips (52) are fixed on the drive shaft (51). A drive synchronous wheel (53) is slidably arranged on the outer side of the drive shaft (51) and the limiting strips (52). The drive synchronous wheel (53) is rotatably connected to one side of the clamping plate (2) via bearings. A driven synchronous wheel (54) is fixed at the end of the connecting shaft away from the clamping seat (1). A synchronous belt (55) is drivingly connected to the outer side of the drive synchronous wheel (53) and the driven synchronous wheel (54). A second servo motor (56) is fixed at one end of the base frame (3). The output shaft of the second servo motor (56) is fixedly connected to one end of the drive shaft (51). A through hole is provided on the clamping plate (2) for the drive shaft (51) to pass through.

4. The precision straightening device for seamless steel pipes according to claim 1, characterized in that, The moving component (8) includes two sets of rotating shafts (81) rotatably connected to the inner cavity of the movable frame (6) via bearings. Two sets of drive gears (82) are fixed to the outer side of the rotating shafts (81). A rack plate (83) meshing with the drive gears (82) is fixed to the bottom of the through slot inner cavity. A third servo motor (84) is fixed to the outer side of the fixed frame (7). The output shaft of the third servo motor (84) passes through the inner cavity of the movable frame (6) and is fixedly connected to one end of a set of rotating shafts (81).

5. The precision straightening device for seamless steel pipes according to claim 1, characterized in that, The clamping assembly (11) includes a movable groove (111) on the front and rear sides of the inner cavity of the fixed frame (7). The front and rear ends of the movable seat (9) are fixed blocks (112) that are slidably disposed in the movable groove (111). A second bidirectional screw (113) is threadedly connected to the center of the fixed block (112). The two ends of the second bidirectional screw (113) are rotatably connected to the fixed frame (7) through bearings. A fourth servo motor (114) is fixed to the top of the fixed frame (7) through a mounting bracket. A drive pulley (115) is fixed to the output shaft of the fourth servo motor (114). The top of the second bidirectional screw (113) extends through to the top of the fixed frame (7) and is fixed to a driven pulley (116). The drive pulley (115) and the driven pulley (116) are connected by a transmission belt.

6. The precision straightening device for seamless steel pipes according to claim 1, characterized in that, The clamping plate (2) has a protrusion (12) fixed on its outer side, and the base frame (3) has a guide groove (13) in its inner cavity. The protrusion (12) is slidably disposed in the guide groove (13).

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