A device for straightening welded steel pipes

Abstract

The utility model relates to the technical field of steel pipe straightening, in particular to a welded steel pipe straightening device, which can prevent the pipe wall of the welded steel pipe from deforming during straightening, and further improves the straightening precision of the welded steel pipe, and comprises an inner support straightening mechanism and an external pressure traction straightening mechanism, the inner support straightening mechanism comprises a first rack, a rotating shaft rotatably installed on the first rack, an inner support straightening assembly installed on the end of the rotating shaft, and a first motor for providing power for the rotation of the rotating shaft, and the outer diameter of the inner support straightening assembly is matched with the inner diameter of the welded steel pipe to be straightened; the external pressure traction straightening mechanism comprises a second rack and two upper and lower symmetrical clamping and limiting traction assemblies installed on the second rack; the clamping and limiting traction assembly comprises a cross frame, two sprockets rotatably installed on the cross frame, a chain sleeved on the two sprockets, multiple clamping blocks uniformly distributed on the chain, and a second motor for providing power for the rotation of the sprocket, and a semicircular die groove matched with the outer diameter of the welded steel pipe to be straightened is arranged on the clamping block.

Description

Technical Field

[0001] This utility model relates to the technical field of steel pipe straightening, and in particular to a welded steel pipe straightening device. Background Technology

[0002] After welding, welded steel pipes will bend to some extent. In order to eliminate the residual stress of the welded steel pipes and adjust their straightness, the welded steel pipes need to be straightened.

[0003] For example, Chinese utility model patent CN217726713U discloses a stainless steel pipe straightening device, including: a workbench, a guide plate bolted to the upper right side of the workbench, a drive frame mounted to the left side of the guide plate, a first straightening device mounted on the surface of the workbench, a second straightening device fixedly mounted to the left side of the first straightening device, and a third straightening device mounted to the left side of the second straightening device. This device uses four sets of straightening devices to straighten bent stainless steel pipes, replacing manual straightening and making it simple and convenient to use.

[0004] However, the above-mentioned device still has the following defects: the roller straightening method will cause slight inward deformation of the welded steel pipe wall, affecting the outer diameter of the welded steel pipe; the straightening accuracy of the welded steel pipe needs to be further improved. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a welded steel pipe straightening device that prevents pipe wall deformation during the straightening process and further improves the straightening accuracy of welded steel pipes.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a welded steel pipe straightening device, comprising an internal support straightening mechanism and an external pressure traction straightening mechanism. The internal support straightening mechanism includes a first frame, a rotating shaft rotatably mounted on the first frame, an internal support straightening component mounted on the end of the rotating shaft, and a first motor providing power for the rotation of the rotating shaft. The outer diameter of the internal support straightening component matches the inner diameter of the welded steel pipe to be straightened. The external pressure traction straightening mechanism includes a second frame and two clamping and limiting traction components symmetrically arranged vertically on the second frame. The clamping and limiting traction component includes a crossbeam, two sprockets rotatably mounted on the crossbeam, a chain sleeved on the two sprockets, multiple clamping blocks evenly distributed on the chain, and a second motor providing power for the rotation of the sprockets. The clamping blocks are provided with semi-circular mold grooves that match the outer diameter of the welded steel pipe to be straightened. The semi-circular mold grooves at the multiple clamping blocks on the two clamping and limiting traction components form an annular mold cavity, and the internal support straightening component is located within the annular mold cavity. Furthermore, the rotating shaft is a solid rigid shaft; the output shaft of the first motor is connected to the rotating shaft via a chain or the like; the external pressure traction straightening mechanism is used for clamping, limiting, and traction conveying of the outer wall of the welded steel pipe to be straightened; the central axis of the annular mold cavity coincides with the central axis of the rotating shaft and the internal support straightening assembly.

[0007] Preferably, the first frame is equipped with multiple sets of evenly distributed straightening supports. Each straightening support includes a bracket that slides vertically on the first frame, a V-shaped support plate that is fixedly installed on the bracket, and a telescopic cylinder that provides power for the vertical sliding of the bracket. Further, the telescopic cylinder can be an electric cylinder or a pneumatic cylinder, etc.

[0008] Preferably, rollers are rotatably mounted on the inner walls of both sides of the V-shaped support plate, and the central axis of the rollers coincides with the central axis of the rotating shaft.

[0009] Preferably, it also includes a material guiding mechanism, which includes a third frame and multiple sets of rollers rotatably mounted on the third frame; the rollers are provided with V-shaped annular grooves.

[0010] Preferably, the system further includes multiple sets of lifting frames corresponding to the rollers, with the rollers rotatably mounted on the lifting frames. A lifting drive unit is mounted on the third frame to provide power for the synchronous lifting of the multiple lifting frames. The lifting drive unit includes multiple lead screws rotatably mounted on the third frame, multiple transmission horizontal shafts, and a drive shaft rotatably mounted on the third frame. The lead screws are threadedly connected to the corresponding lifting frames. One end of the transmission horizontal shaft is connected to the lead screw, and the other end is connected to the drive shaft. Further, one end of the transmission horizontal shaft is connected to the corresponding lead screw via two bevel gear sets, and the other end is connected to the drive shaft via two bevel gear sets. A hand crank is fixedly mounted on the end of the drive shaft.

[0011] Preferably, the rotating shaft is detachably connected to the inner support straightening assembly, and the clamping block is detachably connected to the chain; further, the inner support straightening assembly is detachably connected to the rotating shaft via a flange and bolts, and the clamping block is detachably connected to the chain via bolts.

[0012] Preferably, the internal support straightening assembly includes a rod and a plurality of internal support rollers rotatably mounted on the rod, the plurality of internal support rollers being evenly distributed around the circumference of the rod; further, the central axis of the internal support rollers coincides with the central axis of the rod, and the outer diameter of the annulus formed by the plurality of internal support rollers matches the inner diameter of the welded steel pipe to be straightened.

[0013] Preferably, the internal support straightening assembly includes a rod and a plurality of internal support molds evenly distributed along the axis of the rod. A plurality of circumferentially distributed internal support wheels are rotatably mounted on the edge of the internal support molds, and the central axis of the internal support wheels is arranged perpendicular to the central axis of the internal support molds.

[0014] Preferably, a grinding tool is fixedly installed at the end of the internal support straightening component; further, the outer diameter of the grinding tool matches the inner diameter of the welded steel pipe to be straightened.

[0015] Compared with the prior art, this utility model provides a welded steel pipe straightening device with the following beneficial effects: The welded steel pipe straightening device feeds the welded steel pipe between two clamping and limiting traction components. The clamping blocks tightly clamp the outer wall of the welded steel pipe. A second motor drives the sprocket to rotate. After transmission through the chain and each clamping block, the welded steel pipe moves towards one side of the rotating shaft. The inner support straightening component is inserted into the welded steel pipe. At the same time, the first motor drives the rotating shaft to rotate, and the inner support straightening component rotates inside the welded steel pipe. The welded steel pipe passes through the standard annular cavity formed between the outer wall of the inner support straightening component and the inner wall of the annular mold cavity. This straightens the welded steel pipe. Because the inner support straightening component supports the inner wall of the welded steel pipe, it prevents the pipe wall from deforming under stress during the straightening process, ensuring the accuracy of the outer diameter of the welded steel pipe and improving the straightening accuracy of the welded steel pipe. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 This is a top view schematic diagram of the structure of this utility model;

[0018] Figure 3 This is the utility model Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0019] Figure 4 This is the utility model Figure 2 Schematic diagram of the cross-sectional structure at point BB;

[0020] Figure 5 This is the utility model Figure 1 A magnified schematic diagram of the structure at point C in the middle;

[0021] Figure 6 This is the utility model Figure 1 A magnified schematic diagram of the structure at point D in the middle;

[0022] Figure 7 This is the utility model Figure 3 A magnified schematic diagram of the structure at point E in the middle;

[0023] Figure 8 This is a three-dimensional structural diagram of the internal support straightening component of this utility model when it adopts an internal support mold and an internal support wheel;

[0024] The following components are labeled in the attached diagram: 1. External pressure traction straightening mechanism; 2. First frame; 3. Rotating shaft; 4. Internal support straightening assembly; 5. First motor; 6. Second frame; 7. Horizontal frame; 8. Sprocket; 9. Chain; 10. Clamping block; 11. Second motor; 12. Semi-circular mold groove; 13. Bracket; 14. V-shaped support plate; 15. Telescopic cylinder; 16. Support roller; 17. Third frame; 18. Roller; 19. V-shaped annular groove; 20. Lifting frame; 21. Lead screw; 22. Transmission horizontal shaft; 23. Drive shaft; 24. Rod body; 25. Internal support roller; 26. Internal support mold plate; 27. Internal support wheel; 28. Grinding tool. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] Example 1

[0029] Please refer to Figures 1-7A welded steel pipe straightening device includes an internal support straightening mechanism and an external pressure traction straightening mechanism 1. The internal support straightening mechanism includes a first frame 2, a rotating shaft 3 rotatably mounted on the first frame 2, an internal support straightening assembly 4 mounted on the end of the rotating shaft 3, and a first motor 5 providing power for the rotation of the rotating shaft 3. The outer diameter of the internal support straightening assembly 4 matches the inner diameter of the welded steel pipe to be straightened. The external pressure traction straightening mechanism 1 includes a second frame 6 and two clamping and limiting traction devices symmetrically arranged vertically on the second frame 6. The clamping and limiting traction assembly includes a crossbeam 7, two sprockets 8 rotatably mounted on the crossbeam 7, a chain 9 sleeved on the two sprockets 8, multiple clamping blocks 10 evenly distributed on the chain 9, and a second motor 11 providing power for the rotation of the sprockets 8. Each clamping block 10 has a semi-circular mold groove 12 that matches the outer diameter of the welded steel pipe to be straightened. The semi-circular mold grooves 12 at the multiple clamping blocks 10 on the two clamping and limiting traction assemblies form an annular mold cavity, and the inner support straightening assembly 4 is located within the annular mold cavity. Furthermore, the rotating shaft 3 is a solid rigid shaft; the output shaft of the first motor 5 is connected to the rotating shaft 3 via the chain 9, etc.; the external pressure traction straightening mechanism 1 is used for clamping, limiting, and traction conveying of the outer wall of the welded steel pipe to be straightened. The central axis of the annular mold cavity coincides with the central axis of the rotating shaft 3 and the inner support straightening assembly 4. It should be noted that the length of the inner support straightening assembly 4 is at least 10 times the outer diameter of the welded steel pipe to be straightened.

[0030] For details, please refer to Figure 7 The internal support straightening assembly 4 includes a rod 24 and a plurality of internal support rollers 25 rotatably mounted on the rod 24. The plurality of internal support rollers 25 are evenly distributed around the rod 24. Furthermore, the central axis of the internal support rollers 25 coincides with the central axis of the rod 24, and the outer diameter of the annular ring formed by the plurality of internal support rollers 25 matches the inner diameter of the welded steel pipe to be straightened.

[0031] For details, please refer to Figure 8 The internal support straightening assembly 4 includes a rod 24 and multiple internal support molds 26 evenly distributed along the axis of the rod 24. Multiple circumferentially distributed internal support wheels 27 are rotatably installed at the edge of the internal support molds 26, and the central axis of the internal support wheels 27 is arranged perpendicular to the central axis of the internal support molds 26.

[0032] For details, please refer to Figure 7 or Figure 8 The end of the inner support straightening component 4 is fixedly equipped with a grinding tool 28; furthermore, the outer diameter of the grinding tool 28 matches the inner diameter of the welded steel pipe to be straightened.

[0033] The welded steel pipe straightening device provided in this embodiment allows for multiple straightening processes on the welded steel pipe after it reaches the limit position of the first frame 2. The second motor 11 drives the corresponding sprocket 8 to rotate in the opposite direction, and the welded steel pipe is then transported in the reverse direction for secondary straightening. This allows for further improvement in the straightening accuracy of the welded steel pipe through multiple straightening processes. The inner support straightening component 4 can take the form of a rod 24 and an inner support roller 25. The rod 24 rotates along with the rotating shaft 3, driving the inner support roller 25 to rotate. The inner support roller 25 contacts the inner wall of the welded steel pipe, significantly reducing the contact area between the welded steel pipe and the inner support straightening component 4. This reduces the rotational resistance of the inner support straightening component 4, making the friction between the inner support straightening component 4 and the welded steel pipe much smaller than that of the clamping and limiting traction. The friction between the component and the welded steel pipe effectively prevents the welded steel pipe from rotating on its own and also reduces the energy consumption of the first motor 5. In another embodiment, the inner support straightening component 4 can also take the form of a rod 24, an inner support mold 26, and an inner support wheel 27, which can also reduce the frictional resistance between the welded steel pipe and the inner support straightening component 4. Under the action of the inner support wheel 27, the frictional resistance when the welded steel pipe is fed along the axis of the rotating shaft 3 can be reduced, thus reducing the energy consumption of the second motor 11. During the rotation of the inner support straightening component 4, the grinding tool 28 can be driven to rotate. The grinding tool 28 can remove the welding protrusion at the weld seam on the inner wall of the welded steel pipe, avoiding interference of the welding protrusion with the straightening accuracy of the welded steel pipe and further ensuring the straightening accuracy of the welded steel pipe.

[0034] Example 2

[0035] The welded steel pipe straightening device provided in Example 1 has been further optimized. For details, please refer to [link / reference needed]. Figure 5 The first frame 2 is equipped with multiple sets of evenly distributed straightening supports. The straightening supports include a bracket 13 that is slidably mounted on the first frame 2, a V-shaped support plate 14 that is fixedly mounted on the bracket 13, and a telescopic cylinder 15 that provides power for the bracket 13 to slide up and down. Furthermore, the telescopic cylinder 15 can be an electric cylinder or a pneumatic cylinder, etc.

[0036] For details, please refer to Figure 5 Rollers 16 are rotatably mounted on the inner walls of both sides of the V-shaped pallet 14, and the central axis of the rollers 16 coincides with the central axis of the rotating shaft 3.

[0037] In the initial state, the bottom of the rotating shaft 3 is placed inside the V-shaped support plate 14 on each straightening support, which effectively supports the rotating shaft 3 and prevents it from bending due to its own weight, thus ensuring the straightness of the rotating shaft 3. When the steel pipe to be welded moves along the axial direction of the rotating shaft 3, the output end of the telescopic cylinder 15 on the corresponding straightening support gradually shortens, the bracket 13 moves down, and the V-shaped support plate 14 supports the welded steel pipe. The straightening support always supports and straightens the rotating shaft 3 and the welded steel pipe to ensure the straightening accuracy of the welded steel pipe. The roller 16 can rotate with the rotating shaft 3, thereby reducing the frictional resistance of the V-shaped support plate 14 on the rotating shaft 3.

[0038] Example 3

[0039] The welded steel pipe straightening device provided in Example 2 has been further optimized. For details, please refer to [link / reference needed]. Figures 1-3 as well as Figures 6-7 It also includes a material guiding mechanism, which includes a third frame 17 and multiple sets of rollers 18 rotatably mounted on the third frame 17; the rollers 18 are provided with V-shaped annular grooves 19.

[0040] For details, please refer to Figures 1-3 as well as Figures 6-7 It also includes multiple sets of lifting frames 20 corresponding to the rollers 18. The rollers 18 are rotatably mounted on the lifting frames 20. A lifting drive is installed on the third frame 17 to provide power for the synchronous lifting of multiple lifting frames 20. The lifting drive includes multiple lead screws 21 rotatably mounted on the third frame 17, multiple transmission horizontal shafts 22, and a drive shaft 23 rotatably mounted on the third frame 17. The lead screws 21 are threadedly connected to the corresponding lifting frames 20. One end of the transmission horizontal shaft 22 is connected to the lead screw 21, and the other end of the transmission horizontal shaft 22 is connected to the drive shaft 23. Furthermore, one end of the transmission horizontal shaft 22 is connected to the corresponding lead screw 21 through two bevel gear sets, and the other end of the transmission horizontal shaft 22 is connected to the drive shaft 23 through two bevel gear sets. A hand crank is fixedly installed at the end of the drive shaft 23.

[0041] For details, please refer to Figure 7 The rotating shaft 3 is detachably connected to the inner support straightening assembly 4, and the clamping block 10 is detachably connected to the chain 9; furthermore, the inner support straightening assembly 4 is detachably connected to the rotating shaft 3 via flanges and bolts, and the clamping block 10 is detachably connected to the chain 9 via bolts.

[0042] The welded steel pipe straightening device provided in this embodiment can place the welded steel pipe in the V-shaped annular groove 19 on each roller 18 to assist in the loading and unloading of the welded steel pipe, so that the welded steel pipe is loaded and unloaded in a horizontal state, avoiding the welded steel pipe from bending itself during the loading and unloading process, thus ensuring the straightness of the welded steel pipe; by rotating the drive shaft 23, after being driven by the transmission horizontal shaft 22 and each bevel gear set, the lead screw 21 rotates, and after being driven by the thread, the lifting frame 20 drives the corresponding roller 18 to move up and down, so that the central axis of the welded steel pipe coincides with the central axis of the rotating shaft 3 and the central axis of the inner support straightening component 4; by replacing the inner support straightening component 4 and clamping block 10 of different sizes, the straightening requirements of welded steel pipes of different sizes can be met, thereby improving the applicability of the device.

[0043] The process of using the welded steel pipe straightening device provided by this utility model is as follows: The welded steel pipe is placed in the V-shaped annular groove 19 on the roller 18, and the end of the welded steel pipe enters between the two clamping and limiting traction components. The second motor 11 is started, and the clamping block 10 tightly clamps the outer wall of the welded steel pipe. The second motor 11 drives the sprocket 8 to rotate. After being driven by the chain 9 and each clamping block 10, the welded steel pipe moves to one side of the rotating shaft 3. The inner support straightening component 4 is inserted into the welded steel pipe. At the same time, the first motor 5 drives the rotating shaft 3 to rotate. The inner support straightening component 4 and the grinding tool 28 rotate inside the welded steel pipe. The grinding tool 28 removes the weld protrusions on the inner wall of the welded steel pipe. The welded steel pipe passes through the standard annular cavity formed between the outer wall of the inner support straightening component 4 and the inner wall of the annular mold cavity. Then, the second motor 11 drives the sprocket 8 to rotate and transport the welded steel pipe in the reverse direction to achieve secondary straightening of the welded steel pipe.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A welded steel pipe straightening device, characterized in that, The system includes an internal support straightening mechanism and an external pressure traction straightening mechanism (1). The internal support straightening mechanism includes a first frame (2), a rotating shaft (3) rotatably mounted on the first frame (2), an internal support straightening assembly (4) mounted on the end of the rotating shaft (3), and a first motor (5) that provides power for the rotation of the rotating shaft (3). The outer diameter of the internal support straightening assembly (4) matches the inner diameter of the welded steel pipe to be straightened. The external pressure traction straightening mechanism (1) includes a second frame (6) and two clamping and limiting traction assemblies symmetrically arranged vertically on the second frame (6). The traction assembly includes a crossbeam (7), two sprockets (8) rotatably mounted on the crossbeam (7), a chain (9) sleeved on the two sprockets (8), multiple clamping blocks (10) evenly distributed on the chain (9), and a second motor (11) that provides power for the rotation of the sprockets (8). The clamping blocks (10) are provided with semi-circular mold grooves (12) that fit the outer diameter of the welded steel pipe to be straightened. The semi-circular mold grooves (12) at the multiple clamping blocks (10) on the two clamping and limiting traction assemblies form an annular mold cavity, and the inner support straightening assembly (4) is located inside the annular mold cavity.

2. The welded steel pipe straightening device according to claim 1, characterized in that, The first frame (2) is equipped with multiple sets of evenly distributed straightening supports. The straightening supports include a bracket (13) that is slidably mounted on the first frame (2), a V-shaped support plate (14) that is fixedly mounted on the bracket (13), and a telescopic cylinder (15) that provides power for the bracket (13) to slide up and down.

3. The welded steel pipe straightening device according to claim 2, characterized in that, The V-shaped pallet (14) has rollers (16) rotatably mounted on the inner walls of both sides, and the central axis of the rollers (16) coincides with the central axis of the rotating shaft (3).

4. The welded steel pipe straightening device according to claim 1 or 3, characterized in that, It also includes a material guiding mechanism, which includes a third frame (17) and multiple sets of rollers (18) rotatably mounted on the third frame (17); the rollers (18) are provided with V-shaped annular grooves (19).

5. The welded steel pipe straightening device according to claim 4, characterized in that, It also includes multiple sets of lifting frames (20) corresponding to the rollers (18). The rollers (18) are rotatably mounted on the lifting frames (20). The third frame (17) is equipped with a lifting drive that provides power for the synchronous lifting of multiple lifting frames (20). The lifting drive includes multiple lead screws (21) rotatably mounted on the third frame (17), multiple transmission horizontal shafts (22) and a drive shaft (23) rotatably mounted on the third frame (17). The lead screws (21) are threadedly connected to the corresponding lifting frames (20). One end of the transmission horizontal shaft (22) is connected to the lead screw (21), and the other end of the transmission horizontal shaft (22) is connected to the drive shaft (23).

6. The welded steel pipe straightening device according to claim 5, characterized in that, The rotating shaft (3) is detachably connected to the inner support straightening assembly (4), and the clamping block (10) is detachably connected to the chain (9).

7. The welded steel pipe straightening device according to claim 1, characterized in that, The inner support straightening assembly (4) includes a rod (24) and multiple inner support rollers (25) rotatably mounted on the rod (24). The multiple inner support rollers (25) are evenly distributed around the rod (24) in the circumference.

8. The welded steel pipe straightening device according to claim 1, characterized in that, The internal support straightening assembly (4) includes a rod (24) and multiple internal support molds (26) evenly distributed along the axial direction of the rod (24). Multiple circumferentially distributed internal support wheels (27) are rotatably installed at the edge of the internal support molds (26), and the central axis of the internal support wheels (27) is arranged perpendicular to the central axis of the internal support molds (26).

9. The welded steel pipe straightening device according to claim 1, characterized in that, A grinding tool (28) is fixedly installed at the end of the internal support straightening component (4).

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