Straightening device and method for welded pipe production

Abstract

The invention discloses a straightening device and method for welded pipe production, and relates to the field of straightening device.The straightening device comprises a frame, an upper end block and a lower end block are slidably installed in an upper movable cavity and a lower movable cavity formed in the upper end and the lower end of the interior of the frame correspondingly, a first motor is embedded in the lower end block, and an output shaft of the first motor is in transmission connection with a driving shaft; the driving shaft is fixedly inserted into the transmission rod, a disc is fixedly installed at the upper end of the transmission rod, the disc and the transmission rod are rotationally connected with a rotating groove formed in the upper end block, the outer ring of the transmission rod is fixedly sleeved with a hyperbolic roller, and the upper end block is driven through a moving assembly. The unique oiling assembly in the device can be automatically triggered in the process of adjusting the distance between the straightening rollers, and due to the design, lubricating oil can be accurately instilled to the contact face of a threaded rod and a threaded groove, abrasion caused by long-term friction of moving parts is effectively relieved, the manual maintenance frequency and the shutdown time are reduced, and long-term stable operation of the device is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of straightening devices, in particular to a straightening device and method for welded pipe production. BACKGROUND

[0002] Welded pipes are steel pipes formed by curling steel plates or steel strips and then welding the joints. They are widely used in construction, machinery, energy transportation and other fields. During the production of welded pipes, residual stress is generated due to forming, welding and cooling, which leads to shape defects such as bending, twisting or excessive ovality. Therefore, straightening must be performed. The straightening process applies precise radial pressure to the welded pipe through mechanical devices to eliminate its straightness deviation and ensure that its geometric size and shape accuracy meet the standards. This is a key step to ensure the quality of subsequent processing, connection performance and reliable use of welded pipes.

[0003] The existing Chinese patent with the publication number CN222359038U discloses a welded pipe straightening machine, which includes a fixed table, support legs, a fixed plate, an adjustable straightening mechanism, a through hole, and a moving mechanism. The support legs are fixedly connected to the lower end of the fixed table, and the fixed plate is fixedly connected to the upper end of the fixed table. The adjustable straightening mechanism is arranged outside the fixed plate, the through hole is formed in the outer wall of the fixed plate, and the moving mechanism is arranged at the upper end of the fixed table. The adjustable straightening mechanism includes a sliding groove, a sliding block, a connecting rod, a straightening roller, a connecting rod, a ring plate, a fixed rod, and a hydraulic rod. The sliding groove is formed in the outer wall of the fixed plate, and the sliding block is slidingly connected to the inside of the sliding groove. This welded pipe straightening machine can adjust the distance between the four straightening pipes, thereby achieving straightening of welded pipes of different specifications and sizes, increasing the application range of welded pipe straightening, and improving the practicality of the straightening device.

[0004] The above-mentioned welded pipe straightening device still has some problems in use. The device mentioned above can adjust the distance to adapt to welded pipes of different specifications, but the adjustment process usually relies on manual operation or requires step-by-step adjustment, making it difficult to quickly, continuously, and automatically adjust to the preset accurate position. This is a gap between the device and the demand for efficient, intelligent, and flexible production of modern welded pipe production lines.

[0005] Therefore, it is necessary to invent a welded pipe straightening device and method to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a welded pipe straightening device and method to solve the problem that the device mentioned above can adjust the distance to adapt to welded pipes of different specifications, but the adjustment process usually relies on manual operation or requires step-by-step adjustment, making it difficult to quickly, continuously, and automatically adjust to the preset accurate position, which is a gap between the device and the demand for efficient, intelligent, and flexible production of modern welded pipe production lines.

[0007] In order to achieve the above object, the present application provides the following technical scheme: Straightening device for welded pipe production, including frame, the upper and lower ends of the frame are provided with upper movable cavity and lower movable cavity, respectively, and the upper end block and the lower end block are slidably installed in the upper movable cavity and the lower movable cavity, respectively, the lower end block is embedded with a motor one, the output shaft of the motor one is drivingly connected with a drive shaft, the drive shaft is fixedly inserted into a transmission rod, the upper end of the transmission rod is fixedly installed with a disc, the disc and the transmission rod are rotatably connected with the rotating groove in the upper end block, the outer ring of the transmission rod is fixedly sleeved with a double-curved roller, the upper end block is driven by a moving assembly, and an oiling assembly is arranged in the frame.

[0008] Preferably, the double-curved rollers are arranged in two groups, and the two groups of double-curved rollers are symmetrically arranged with respect to the center axis of the frame as the symmetric axis.

[0009] Preferably, the moving assembly comprises a motor two embedded in the frame, the output shaft of the motor two is drivingly installed with a threaded rod, the threaded rod is threadedly connected with the threaded groove in the upper end block, the outer ring of the threaded rod is provided with two sections of threads with different screw directions, and the two sections of threads with different screw directions are respectively threadedly connected with the two symmetrically arranged upper end blocks, the rotation of the threaded rod is driven by starting the motor two, so that the two upper end blocks move towards each other or away from each other.

[0010] Preferably, the oiling assembly comprises a conical cavity arranged on the upper end block, a jacking block is fixedly installed in the conical cavity through a connecting block, and the jacking block is in contact with an oil inlet structure, the top of the jacking block is cut into a circular truncated cone shape, the top wall of the jacking block is in contact with and slidably connected with the top wall of the upper movable cavity, and there is a gap between the lower end of the jacking block and the inner ring wall of the conical cavity.

[0011] Preferably, the oil inlet structure further comprises movable grooves arranged on both sides of the top of the frame, and a vertical rod is slidably installed in the movable grooves through elastic limiting structures, the lower sharp end of the vertical rod is slidably connected with the outer wall of the jacking block, the sharp end is arranged in the upper movable cavity, the top of the vertical rod is fixedly installed with a top disc, and the oil inlet structure further comprises a refueling channel arranged in the vertical rod, and the lower end outlet of the refueling channel is cross-shaped.

[0012] Preferably, the elastic limiting structure includes side blocks fixedly installed on both sides of the vertical rod. The side blocks are attached to the inner wall of the square groove inside the movable groove to achieve a sliding connection between the upper and lower parts. The side blocks and the square groove are elastically connected by a spring. After the lifting block moves and contacts the lower tip of the vertical rod, it lifts the vertical rod, causing the oil filling port above the oil filling channel to leak into the frame. The lubricating oil is injected into the oil filling port on the oil filling channel using a syringe injection oil filling assembly. The lubricating oil flows out from the outlet below the oil filling channel and drips down the outer wall of the lifting block into the conical cavity to contact the threaded rod inside the threaded groove, thereby achieving lubrication processing of the threaded groove and the threaded rod.

[0013] This invention also provides a straightening method for welded pipe production, which uses the above-mentioned straightening device for welded pipe production for processing. The specific operation steps are as follows: Step 1: Equipment preparation and pipe positioning. According to the specifications and dimensions of the pipe to be straightened, start motor 2 on the device. Motor 2 drives the threaded rod to rotate, which in turn drives the two upper end blocks to move towards or away from each other in the upper movable cavity of the frame, thereby adjusting the distance between the two sets of hyperbolic rollers to a suitable position. Then, introduce the pipe to be straightened from the feed end of the device and place it between the two hyperbolic rollers. Step 2: Straightening and conveying of welded pipe. Start motor 1 located inside the lower end block. Motor 1 drives the transmission rod and two sets of hyperbolic rollers fixed on it to rotate through the drive shaft. At the same time, since the welded pipe is clamped between the two hyperbolic rollers, the welded pipe will start to move forward in a straight line under the action of friction. During this process, the symmetrically arranged hyperbolic rollers apply radial pressure to the welded pipe, continuously correcting its straightness deviation and completing the straightening process. Step 3: Automatic Lubrication and Maintenance. During the adjustment of the straightening roller spacing in Step 1, the lifting block fixed on the upper end block will move synchronously with the movement of the upper end block. When it moves to a specific position (usually the position that needs lubrication), the inclined surface of the lifting block will contact the tip below the vertical rod and lift the vertical rod upward. At this time, the oiling channel inlet is exposed. The operator can use an oiling tool (such as a syringe) to inject lubricating oil through the oiling channel. The lubricating oil flows out through the cross-shaped outlet at the bottom of the channel, flows down the outer wall of the lifting block, and finally drips into the conical cavity and wets the meshing part of the thread groove and the threaded rod, realizing automatic lubrication of key moving parts, effectively reducing wear, and ensuring smooth long-term operation of the device.

[0014] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. This invention uses a motor to drive the threaded rod to rotate, enabling the two sets of upper blocks and their hyperbolic rollers to move towards or away from each other, thereby precisely and conveniently adjusting the distance between the two sets of straightening rollers to accommodate welded pipes of different diameters, significantly improving the versatility and applicability of the device. 2. The unique oiling component inside the device can be automatically triggered during the adjustment of the straightening roller spacing. This design allows the lubricating oil to be accurately dripped onto the contact surface between the threaded rod and the thread groove, effectively reducing the wear of moving parts caused by long-term friction, reducing the frequency of manual maintenance and downtime, and ensuring the long-term stable operation of the equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a perspective view of the overall structure of the present invention; Figure 2 This is a perspective view of the internal structure of the frame (in a partially cross-sectional view) of the present invention. Figure 3 For the present invention Figure 2 Enlarged plan view of the structure at point A in the middle; Figure 4 This is a perspective view of the internal structure of the frame (in a longitudinal partial section state) of the present invention; Figure 5 For the present invention Figure 4 Enlarged plan view of the structure at point B; Figure 6 This is an exploded view of the internal structure of the oiling assembly of the present invention; Figure 7 For the present invention Figure 6 A magnified plan view of the structure at point C.

[0017] Explanation of reference numerals in the attached figures: 1. Frame; 2. Upper block; 3. Lower block; 4. Motor 1; 5. Drive shaft; 6. Transmission rod; 7. Hyperbolic roller; 8. Disc; 9. Rotating groove; 10. Upper movable cavity; 11. Lower movable cavity; 12. Moving assembly; 121. Motor 2; 122. Threaded rod; 123. Threaded groove; 13. Oiling assembly; 131. Conical cavity; 132. Connecting block; 133. Lifting block; 134. Vertical rod; 135. Top plate; 136. Oiling channel; 137. Side block; 138. Movable groove; 139. Spring. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This invention provides, for example Figures 1-7The straightening device for welded pipe production shown includes a frame 1. An upper movable cavity 10 and a lower movable cavity 11 are opened at the upper and lower ends of the frame 1, respectively, in which an upper end block 2 and a lower end block 3 are slidably installed. A motor 4 is fitted inside the lower end block 3, and the output shaft of the motor 4 is driven by a drive shaft 5. The drive shaft 5 is fixedly inserted into a transmission rod 6. A disc 8 is fixedly installed at the upper end of the transmission rod 6, and the disc 8 and the transmission rod 6 are rotatably connected to a rotating groove 9 inside the upper end block 2. A hyperbolic roller 7 is fixedly fitted on the outer ring of the transmission rod 6. Two sets of hyperbolic rollers 7 are provided, and the two sets of hyperbolic rollers 7 are symmetrically arranged with reference to the central axis of the frame 1. The upper end block 2 is driven by a moving component 12. An oiling component 13 is provided inside the frame 1.

[0020] The moving component 12 includes a second motor 121 fitted inside the frame 1, and the output shaft of the second motor 121 is driven to install a threaded rod 122. The threaded rod 122 is threadedly connected to the threaded groove 123 provided inside the upper end block 2. The outer ring of the threaded rod 122 is provided with two sections of threads with different directions, and the two sections of threads with different directions are threadedly connected to two symmetrically arranged upper end blocks 2 respectively.

[0021] In this way, when in use, the motor 121 drives the threaded rod 122 to rotate, causing the two upper blocks 2 to move towards each other or away from each other, thereby allowing the spacing between the two sets of hyperbolic rollers 7 to be adjusted, which is convenient for straightening welded pipes of different diameters.

[0022] The oiling assembly 13 includes a conical cavity 131 disposed on the upper end block 2, and a lifting block 133 is fixedly installed inside the conical cavity 131 through a connecting block 132. The lifting block 133 is in contact with the oil inlet structure. The top of the lifting block 133 is cut into a frustum shape, and the top wall of the lifting block 133 is attached to the top wall of the upper movable cavity 10 to achieve a sliding connection. There is a gap between the lower end of the lifting block 133 and the inner ring wall of the conical cavity 131.

[0023] The oil inlet structure also includes movable grooves 138 on both sides of the top of the frame 1, and vertical rods 134 are slidably installed inside the movable grooves 138 through an elastic limiting structure. The lower tip of the vertical rod 134 is slidably connected to the outer wall of the lifting block 133, and the tip is located in the upper movable cavity 10. A top plate 135 is fixedly installed on the top of the vertical rod 134. The oil inlet structure also includes a refueling channel 136 inside the vertical rod 134, and the lower outlet of the refueling channel 136 is arranged in a cross shape.

[0024] The elastic limiting structure includes side blocks 137 fixedly installed on both sides of the vertical rod 134. The side blocks 137 are attached to the inner wall of the square groove inside the movable groove 138 to achieve a sliding connection between the upper and lower parts. The side blocks 137 and the square groove are elastically connected by a spring 139 so that the vertical rod 134 can be reset later, so that the oil inlet at the upper end of the refueling channel 136 is hidden inside the frame 1, preventing impurities from entering the refueling channel 136.

[0025] After the lifting block 133 moves and contacts the lower tip of the vertical rod 134, it lifts the vertical rod 134, causing the oiling port above the oiling channel 136 to leak into the frame 1. The lubricating oil is injected into the oiling port on the oiling channel 136 using the syringe injection oiling assembly. The lubricating oil flows out from the outlet below the oiling channel 136 and drips down the outer wall of the lifting block 133 into the conical cavity 131, where it contacts the threaded rod 122 inside the threaded groove 123, thus achieving the lubrication of the threaded groove 123 and the threaded rod 122.

[0026] This invention also provides a straightening method for welded pipe production, which uses the above-mentioned straightening device for welded pipe production for processing. The specific operation steps are as follows: Step 1: Equipment preparation and pipe positioning. According to the specifications and dimensions of the pipe to be straightened, start the motor 121 on the device. The motor 121 drives the threaded rod 122 to rotate, which in turn drives the two upper end blocks 2 to move towards or away from each other in the upper movable cavity 10 of the frame 1, thereby adjusting the distance between the two sets of hyperbolic rollers 7 to a suitable position. Then, the pipe to be straightened is introduced from the feed end of the device and placed between the two hyperbolic rollers 7. Step 2: Straightening and conveying of welded pipe. Start the motor 4 located inside the lower end block 3. The motor 4 drives the transmission rod 6 and the two sets of hyperbolic rollers 7 fixed on it to rotate through the drive shaft 5. At the same time, since the welded pipe is clamped between the two hyperbolic rollers 7, the welded pipe will start to move forward in a straight line under the action of friction. During this process, the symmetrically arranged hyperbolic rollers 7 apply radial pressure to the welded pipe, continuously correcting its straightness deviation and completing the straightening process. Step 3: Automatic Lubrication and Maintenance. During the process of adjusting the straightening roller spacing in Step 1, the lifting block 133 fixed on the upper end block 2 will move synchronously with the movement of the upper end block 2. When it moves to a specific position (usually the position that needs lubrication), the inclined surface of the lifting block 133 will contact the tip below the vertical rod 134 and lift the vertical rod 134 upward. At this time, the inlet of the oiling channel 136 is exposed. The operator can use an oiling tool (such as a syringe) to inject lubricating oil through the oiling channel 136. The lubricating oil flows out through the cross-shaped outlet at the bottom of the channel, flows down along the outer wall of the lifting block 133, and finally drips into the conical cavity 131 and wets the meshing part of the threaded groove 123 and the threaded rod 122, realizing automatic lubrication of key moving parts, effectively reducing wear, and ensuring smooth long-term operation of the device.

[0027] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A straightening device for welded pipe production, comprising a frame (1), characterized in that, The upper movable cavity (10) and lower movable cavity (11) at the upper and lower ends of the frame (1) are respectively slidably installed with an upper end block (2) and a lower end block (3). A motor (4) is fitted inside the lower end block (3), and the output shaft of the motor (4) is connected to a drive shaft (5). The drive shaft (5) is fixedly inserted into a transmission rod (6). A disc (8) is fixedly installed at the upper end of the transmission rod (6), and the disc (8) and the transmission rod (6) are rotatably connected to the rotating groove (9) provided inside the upper end block (2). A hyperbolic roller (7) is fixedly fitted on the outer ring of the transmission rod (6). The upper end block (2) is driven by a moving component (12). An oiling component (13) is provided inside the frame (1).

2. The straightening device for welded pipe production according to claim 1, characterized in that, The hyperbolic rollers (7) are arranged in two sets, and the two sets of hyperbolic rollers (7) are symmetrically arranged with reference to the central axis of the frame (1) as the axis of symmetry.

3. The straightening device for welded pipe production according to claim 2, characterized in that, The moving component (12) includes a second motor (121) fitted inside the frame (1), and the output shaft of the second motor (121) is driven by a threaded rod (122), and the threaded rod (122) is threadedly connected to the threaded groove (123) provided inside the upper block (2).

4. The straightening device for welded pipe production according to claim 3, characterized in that, The outer ring of the threaded rod (122) is provided with two sections of threads with different directions, and the two sections of threads with different directions are respectively threaded to two symmetrically arranged upper blocks (2).

5. The straightening device for welded pipe production according to claim 4, characterized in that, The oiling assembly (13) includes a conical cavity (131) disposed on the upper end block (2), and a lifting block (133) is fixedly installed inside the conical cavity (131) through a connecting block (132), and the lifting block (133) is in contact with the oil inlet structure.

6. The straightening device for welded pipe production according to claim 5, characterized in that, The top of the lifting block (133) is cut into a frustum shape, and the top wall of the lifting block (133) is attached to the top wall of the upper movable cavity (10) to achieve a sliding connection. There is a gap between the lower end of the lifting block (133) and the inner ring wall of the conical cavity (131).

7. The straightening device for welded pipe production according to claim 6, characterized in that, The oil inlet structure also includes movable grooves (138) on both sides of the top of the frame (1), and vertical rods (134) are installed inside the movable grooves (138) by elastic limiting structure. The lower tip of the vertical rod (134) is slidably connected to the outer wall of the lifting block (133), and the tip is located in the upper movable cavity (10). A top plate (135) is fixedly installed on the top of the vertical rod (134). The oil inlet structure also includes a refueling channel (136) inside the vertical rod (134), and the lower outlet of the refueling channel (136) is arranged in a cross shape.

8. The straightening device for welded pipe production according to claim 7, characterized in that, The elastic limiting structure includes side blocks (137) fixedly installed on both sides of the vertical rod (134), wherein the side blocks (137) are attached to the inner wall of the square groove inside the movable groove (138) to achieve a sliding connection between the upper and lower parts, and the side blocks (137) and the square groove are elastically connected by springs (139).

9. A straightening method for welded pipe production, employing the straightening device for welded pipe production as described in any one of claims 1-8, characterized in that, The specific operating steps are as follows; Step 1: Equipment preparation and pipe positioning. According to the specifications and dimensions of the pipe to be straightened, start the second motor (121) on the device. The second motor (121) drives the threaded rod (122) to rotate, thereby driving the two upper end blocks (2) to move towards or away from each other in the upper movable cavity (10) of the frame (1), thereby adjusting the distance between the two sets of hyperbolic rollers (7) to a suitable position. Then, the pipe to be straightened is introduced from the feed end of the device and placed between the two hyperbolic rollers (7). Step 2: Straightening and conveying of welded pipe. Start the motor 1 (4) located inside the lower end block (3). The motor 1 (4) drives the transmission rod (6) and the two sets of hyperbolic rollers (7) fixed on it to rotate through the drive shaft (5). At the same time, since the welded pipe is clamped between the two hyperbolic rollers (7), the welded pipe will start to move forward in a straight line under the action of friction. During this process, the symmetrically arranged hyperbolic rollers (7) apply radial pressure to the welded pipe, continuously correcting its straightness deviation and completing the straightening process. Step 3: Automatic Lubrication and Maintenance. During the process of adjusting the straightening roller spacing in Step 1, the lifting block (133) fixed on the upper end block (2) will move synchronously with the movement of the upper end block (2). When it moves to a specific position (usually the position that needs lubrication), the inclined surface of the lifting block (133) will contact the tip of the vertical rod (134) and lift the vertical rod (134) upward. At this time, the inlet of the oiling channel (136) is exposed. The operator can use an oiling tool (such as a syringe) to inject lubricating oil through the oiling channel (136). The lubricating oil flows out through the cross-shaped outlet at the bottom of the channel, flows down along the outer wall of the lifting block (133), and finally drips into the conical cavity (131) and wets the meshing part of the thread groove (123) and the thread rod (122), realizing automatic lubrication of key moving pairs, effectively reducing wear, and ensuring smooth long-term operation of the device.

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