Steel pipe forming production line

Abstract

The utility model provides a steel pipe forming production line. The problem that an existing high-frequency straight seam welded steel pipe is low in finished product rate when welded to an ultra-thin-wall steel pipe is solved. The device comprises a forming device, a welding device and a shaping device which are sequentially arranged along the machining procedure, the moving path of the steel comprises an ascending section, a welding section and a descending section, the ascending section is the moving path of the steel at the forming device, the welding section is the moving path of the steel at the welding device, and the descending section is the moving path of the steel at the descending section. The descending section is a moving path of the steel between the welding device and the shaping device, the ascending section gradually inclines upwards in the moving direction of the steel, the descending section gradually inclines downwards in the moving direction of the steel, in the whole machining process, the steel pipe is always in a tensioned state, and the welding quality is good.

Description

Technical Field

[0001] The present invention relates to the technical field of processing equipment, in particular to a steel pipe forming production line. Background Art

[0002] The existing manufacturing process of high-frequency straight seam welded steel pipes mainly includes the following steps: 1. Raw material preparation: Select suitable cold-rolled or hot-rolled steel plates as raw materials; 2. Steel plate forming: Bend the steel plates through a mold to form a steel pipe of a certain shape; 3. Welding: The steel plates at both ends of the steel pipe are heated by high-frequency current to make them melt quickly and tightly join to form a continuous weld. This step is a key link in the manufacturing process of high-frequency welded steel pipes. Parameters such as welding speed, welding pressure and input heat need to be strictly controlled to ensure welding quality; 4. Cooling treatment: After welding is completed, the steel pipe is cooled to achieve the ideal strength and hardness.

[0003] High-frequency welding is a process that uses the resistive heating effect of high-frequency current to weld metal materials together. The working principle is to place the metal material in a high-frequency current magnetic field. Under the influence of the magnetic field, eddy currents are generated within the metal material, generating a large amount of resistive heat, which melts the metal material and achieves the welding purpose. This welding method is particularly suitable for welding thin-walled metal materials. However, when welding ultra-thin-wall steel pipes, such as those with a wall thickness of 0.3-0.43mm, existing high-frequency straight seam welding equipment is very prone to welding defects such as wrinkling, pinholes, and air holes due to the thinness of the steel pipe wall. This results in a high scrap rate during the ultra-thin-wall steel pipe forming process. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the forming process of existing high-frequency straight seam welded steel pipe forming equipment and to provide a steel pipe forming production line suitable for welding ultra-thin-wall steel pipes with good welding quality and high yield.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A steel pipe forming production line includes a forming device, a welding device and a shaping device arranged in sequence along the moving direction of the steel. The forming device is used to bend the strip steel into a tube, the welding device is used to weld the joints of the bent and formed tubular steel, and the shaping device is used to shape the welded steel. It is characterized in that the moving path of the steel includes an upward section, a welding section and a downward section. The upward section is the moving path of the steel at the forming device, the welding section is the moving path of the steel at the welding device, and the downward section is the moving path of the steel between the welding device and the shaping device. The upward section gradually tilts upward along the moving direction of the steel, and the downward section gradually tilts downward along the moving direction of the steel. The highest point of the steel moving path is located on the welding section.

[0007] Preferably, the forming device includes multiple groups of forming wheel groups arranged in sequence along the conveying direction of the steel, the forming wheel groups include upper forming wheels and lower forming wheels, the centers of the multiple upper forming wheels are located on the same plane, the centers of the multiple lower forming wheels are located on the same plane, and the two planes are parallel and arranged to be inclined upward along the conveying direction of the steel.

[0008] Preferably, the shaping device includes multiple groups of shaping wheel groups arranged in sequence along the conveying direction of the steel, the shaping wheel groups include upper shaping wheels and lower shaping wheels, the centers of multiple upper shaping wheels are located on the same horizontal plane, the centers of multiple lower shaping wheels are located on the same horizontal plane, and the center of the first lower shaping wheel arranged along the conveying direction in the shaping device is located on the plane where the center of the lower shaping wheel is located.

[0009] Preferably, the angle between the plane where the centers of the multiple upper forming wheels are located and the horizontal plane is in the range of 0.32-0.33 degrees.

[0010] Preferably, the inclination angle of the descending section relative to the horizontal plane ranges from 0.32 to 0.33 degrees.

[0011] Preferably, the forming device includes a plurality of vertical adjustment devices and lateral adjustment devices arranged in sequence, and the plurality of vertical adjustment devices and lateral adjustment devices are staggered in sequence, and the vertical adjustment devices and lateral adjustment devices are both height-adjusted by an adjustment mechanism.

[0012] Preferably, the adjustment mechanism is a gasket.

[0013] Preferably, the vertical adjustment device includes two relatively arranged mounting seats, and a first roller and a second roller are arranged between the two mounting seats in sequence from top to bottom. An adjustment rod for adjusting the height of the first roller is provided at the upper end of the mounting seat, and the centers of the first rollers and the second rollers on multiple vertical adjustment devices are located on the same straight line. The above-mentioned upper forming wheel is rotatably set on the first roller, and the above-mentioned lower forming wheel is rotatably set on the second roller.

[0014] Preferably, the production line also includes a conveying device, a straightening device, a cutting device, and a cooling device. The processing steps are in order: a conveying device, a straightening device, a forming device, a welding device, a cutting device, a cooling device, and a shaping device. The welding device uses high-frequency welding for welding.

[0015] Preferably, the cutting device comprises a first cutter and a second cutter which are arranged in sequence, the second cutter has a deeper depth than the first cutter, and a roller for recycling waste is provided above the second cutter.

[0016] Preferably, two relatively arranged mounting frames are provided at the rear of the shaping device, and the processed steel passes through the mounting frames. A rotating wheel is movably provided on the mounting frame, and the axial direction of the rotating wheel coincides with the steel. A correction frame for correcting the steel is provided on the rotating wheel, and the correction frame is fixedly provided on the above-mentioned rotating wheel. The correction frame can rotate around the axial direction of the steel along with the rotating wheel, and the rotating wheel and the correction frame are respectively located on both sides of the above-mentioned mounting frame.

[0017] Preferably, the rotating wheel is a worm gear, and the mounting frame is provided with a rotating rod for driving the rotating wheel to rotate to achieve the angle adjustment of the correction frame. The rotating rod is a worm gear that is always engaged with the rotating wheel.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] 1. The present invention divides the moving path of the steel into an ascending section, a welding section and a descending section, so that the moving path of the steel in the ascending section, the welding section and the descending section is gradually ascending and then gradually descending. The welding section is located at the highest position, and a downward pressure trend is formed at both ends of the welding, thereby producing a tensioning and flattening effect on the steel pipe in the welding section. After the steel pipe in the welding section is tensioned and flattened, it is beneficial to ensure the welding quality and greatly reduce the scrap rate. It is particularly suitable for ultra-thin-wall steel pipe forming processing.

[0020] 2. Control the slope of the upward section and the downward section within a reasonable range. The limitation of the reasonable range value can realize the tensioning and leveling of the steel pipe, and can also effectively prevent the connection corners between the upward section and the welding section, and the welding section and the downward section from creases due to excessive angle changes, thereby ensuring the straightness of the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the present invention;

[0022] Figure 2 It is a front view of the vertical adjustment device;

[0023] Figure 3 is a side view of the vertical adjustment device;

[0024] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 5 It is a structural diagram of the shaping device;

[0026] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0027] Figure 7 It is a finished product welded by existing high-frequency straight seam welded steel pipe forming equipment;

[0028] Figure 8 The product is welded and formed by the present invention.

[0029] Markings in the figure: 1. Conveying device; 2. Straightening device; 3. Forming device; 4. Welding device; 5. Cutting device; 6. Shaping device; 7. Vertical adjustment device; 8. Horizontal adjustment device; 9. Adjustment mechanism; 10. Mounting seat; 11. First roller; 12. Second roller; 13. Adjustment rod; 14. First cutter; 15. Second cutter; 16. Roller; 17. Mounting frame; 18. Rotating wheel; 19. Correction frame; 20. Rotating rod; 21. Cooling device. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0031] like Figure 1-6As shown, a steel pipe forming production line includes a forming device 3, a welding device 4 and a shaping device 6 arranged in sequence along the moving direction of the steel. The forming device 3 is used to bend the strip steel into a tube, the welding device 4 is used for welding the joints of the bent and formed tubular steel, and the shaping device 6 is used to shape the welded steel. The moving path of the steel includes an upward section, a welding section and a downward section. The upward section is the moving path of the steel at the forming device 3, the welding section is the moving path of the steel at the welding device 4, and the downward section is the moving path of the steel between the welding device 4 and the shaping device 6. The upward section gradually tilts upward along the moving direction of the steel, and the downward section gradually tilts downward along the moving direction of the steel. The highest point of the steel moving path is located on the welding section. The forming device 3 includes multiple forming wheel groups arranged in sequence along the steel conveying direction. The forming wheel groups include upper and lower forming wheels. The centers of multiple upper forming wheels are located on the same plane. The centers of multiple lower forming wheels are located on the same plane. The two planes are parallel and inclined upward along the steel conveying direction. The shaping device 6 includes multiple shaping wheel groups arranged in sequence along the steel conveying direction. The shaping wheel groups include upper and lower shaping wheels. The centers of multiple upper shaping wheels are located on the same horizontal plane. The center of the first lower shaping wheel arranged in the conveying direction of the forming device is located on the plane where the center of the lower shaping wheel is located. The angle between the plane where the centers of the multiple upper shaping wheels are located and the horizontal plane ranges from 0.32 to 0.33 degrees. The forming device 3 includes a plurality of vertical adjustment devices 7 and lateral adjustment devices 8 arranged in sequence. The plurality of vertical adjustment devices 7 and lateral adjustment devices 8 are arranged in an alternating manner. The vertical adjustment devices 7 and lateral adjustment devices 8 are both height-adjustable via an adjustment mechanism 9. The vertical adjustment device 7 includes two oppositely arranged mounting seats 10. A first roller 11 and a second roller 12 are arranged between the two mounting seats 10 from top to bottom. An adjustment rod 13 for adjusting the height of the first roller 11 is provided at the upper end of the mounting seat 10. The centers of the first roller 11 and the second roller 12 on the plurality of vertical adjustment devices 7 are located on the same straight line. The upper forming wheel is rotatably mounted on the first roller, and the lower forming wheel is rotatably mounted on the second roller. The adjustment mechanism 9 is a gasket, which facilitates height adjustment. By dividing the moving path of the steel into an ascending section, a welding section and a descending section, the moving path of the steel in the ascending section, the welding section and the descending section is gradually ascending and then gradually descending. During the overall processing process, the steel is always in a tensioned state. The thin-walled tube is not prone to displacement and deformation during the processing and transportation process, and the forming and welding effects are better.

[0032] The production line also includes a conveying device 1, a straightening device 2, a cutting device 5, and a cooling device 21. The processing steps are as follows: conveying device 1, straightening device 2, forming device 3, welding device 4, cutting device 5, cooling device 21, and shaping device 6. The welding device 4 uses high-frequency welding. The cutting device 5 includes a first cutter 14 and a second cutter 15 arranged in sequence. The second cutter 15 has a deeper depth than the first cutter 14, and a roller 16 for recycling waste is provided above the second cutter 15. After cutting, the waste cut by the second cutter 15 with a larger depth is recycled by the roller 16, further improving the utilization rate of materials and reducing production costs.

[0033] Two opposing mounting brackets 17 are located behind the shaping device 6. The processed steel material passes through these brackets 17. A rotating wheel 18 is movably mounted on each bracket 17, its axis aligning with the steel material. A straightening bracket 19 is mounted on each of these wheels to straighten the steel material. This straightening bracket 19 is fixed to the rotating wheel 18 and can rotate along with the rotating wheel 18 around the steel material's axis. The two brackets are located on either side of the mounting bracket 17. The rotating wheel 18 is a worm gear, and a rotating rod 20 is mounted on the mounting bracket 17 to drive the rotating wheel 18 and adjust the angle of the straightening bracket 19. This rotating rod 20 is a worm gear that is constantly engaged with the rotating wheel 18. The straightening bracket 19 is held against the sidewall of the steel material, providing the final straightening and straightening effect. The angle of the straightening bracket 19 can be easily adjusted to accommodate different types of steel material using the rotating rod 20.

[0034] Figure 7 The finished product is welded by the existing high-frequency straight seam welded steel pipe forming equipment, and wrinkles can be clearly seen. Figure 8 The welding effect of the finished product formed by the present invention is relatively Figure 7 Significantly better.

[0035] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising from these variations or modifications to the description remain within the scope of protection of the present invention.

Claims

1. A steel pipe forming production line, characterized in that: The invention comprises a forming device (3), a welding device (4) and a shaping device (6) which are sequentially arranged along the moving direction of the steel material. The forming device (3) is used to bend the strip steel material into a tube shape. The welding device (4) is used to weld the joints of the bent and formed tube steel material. The shaping device (6) is used to shape the welded steel material. The moving path of the steel material comprises an upward section, a welding section and a downward section. The upward section is the moving path of the steel material at the forming device (3). The welding section is the moving path of the steel material at the welding device (4). The downward section is the moving path of the steel material between the welding device (4) and the shaping device (6). The upward section gradually tilts upward along the moving direction of the steel material. The downward section gradually tilts downward along the moving direction of the steel material. The highest point of the moving path of the steel material is located on the welding section.

2. A steel pipe forming production line according to claim 1, characterized in that: The forming device (3) comprises a plurality of forming wheel groups sequentially arranged along the conveying direction of the steel material, the forming wheel groups comprising an upper forming wheel and a lower forming wheel, the centers of the plurality of upper forming wheels being located on the same plane, the centers of the plurality of lower forming wheels being located on the same plane, the two planes being parallel and arranged to be tilted upward along the conveying direction of the steel material.

3. The steel pipe forming production line according to claim 1, characterized in that: The shaping device (6) comprises a plurality of shaping wheel groups arranged in sequence along the conveying direction of the steel material, the shaping wheel groups comprising upper shaping wheels and lower shaping wheels, the centers of the plurality of upper shaping wheels being located on the same horizontal plane, the centers of the plurality of lower shaping wheels being located on the same horizontal plane, and the center of the first lower shaping wheel arranged along the conveying direction in the shaping device being located on the plane where the centers of the lower shaping wheels are located.

4. A steel pipe forming production line according to claim 2, characterized in that: The angle between the plane where the centers of the upper forming wheels are located and the horizontal plane is in the range of 0.32-0.33 degrees.

5. The steel pipe forming production line according to claim 2, characterized in that: The forming device (3) comprises a plurality of vertical adjustment devices (7) and horizontal adjustment devices (8) arranged in sequence, wherein the plurality of vertical adjustment devices (7) and horizontal adjustment devices (8) are arranged alternately in sequence, and the vertical adjustment devices (7) and horizontal adjustment devices (8) are both height-adjusted by an adjustment mechanism (9).

6. The steel pipe forming production line according to claim 5, characterized in that: The adjusting mechanism (9) is a gasket.

7. The steel pipe forming production line according to claim 6, characterized in that: The vertical adjustment device (7) comprises two mounting seats (10) arranged opposite to each other, a first roller (11) and a second roller (12) are arranged between the two mounting seats (10) in order from top to bottom, an adjustment rod (13) for adjusting the height of the first roller (11) is arranged at the upper end of the mounting seat (10), the centers of the first rollers (11) and the second rollers (12) on the plurality of vertical adjustment devices (7) are located on the same straight line, the upper forming wheel is rotatably arranged on the first roller, and the lower forming wheel is rotatably arranged on the second roller.

8. The steel pipe forming production line according to claim 1, characterized in that: The production line further comprises a conveying device (1), a straightening device (2), a cutting device (5), and a cooling device (21). The processing steps are sequentially the conveying device (1), the straightening device (2), the forming device (3), the welding device (4), the cutting device (5), the cooling device (21), and the shaping device (6). The welding device (4) performs welding by high-frequency welding.

9. The steel pipe forming production line according to claim 8, characterized in that: The cutting device (5) comprises a first cutter (14) and a second cutter (15) which are arranged in sequence. The second cutter (15) has a greater depth than the first cutter (14), and a roller (16) for recycling waste is provided above the second cutter (15).

10. The steel pipe forming production line according to claim 8, characterized in that: Two mounting frames (17) are arranged opposite to each other at the rear of the shaping device (6). The processed steel pipe passes through the mounting frame (17). A rotating wheel (18) is movably arranged on the mounting frame (17). The axial direction of the rotating wheel (18) coincides with the steel pipe. A correction frame (19) for correcting the steel pipe is arranged on the rotating wheel (18). The correction frame (19) is fixedly arranged on the rotating wheel (18). The correction frame (19) can rotate around the axial direction of the steel pipe along with the rotating wheel (18). The rotating wheel (18) and the correction frame (19) are respectively located on both sides of the mounting frame (17). The rotating wheel (18) is a worm gear. The mounting frame (17) is provided with a rotating rod (20) for driving the rotating wheel (18) to rotate to achieve angle adjustment of the correction frame (19). The rotating rod (20) is a worm gear that is always engaged with the rotating wheel (18).

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