Special plate rolling machine for welded pipe and its use method

Abstract

This invention discloses a special plate rolling machine for welded pipes and its usage method. The plate rolling machine includes: a frame, comprising a lower crossbeam and an upper crossbeam; two opposing lower rollers, each mounted on the lower crossbeam, with their ends connected to lower roller drives; an upper roller, positioned above and between the two lower rollers, with its end connected to an upper roller drive; a drive-end reverse bending cylinder and a passive-end reverse bending cylinder, located at both ends of the lower crossbeam and opposite to the ends of the upper roller, for lifting the ends of the upper roller; two pressing devices, each located on the upper crossbeam, for applying pressure to the upper roller during downward movement; and a support crossbeam, detachably connected at both ends to the two pressing devices, for applying pressure to the upper roller during downward movement of the pressing devices. For larger pipe diameters, the reverse bending cylinders apply a reverse bending force to the ends of the upper roller, eliminating its deflection. For smaller pipe diameters, the rigidity of the support crossbeam ensures the rigidity of the upper roller, guaranteeing the rolling quality.

Description

Technical Field

[0001] This invention relates to the field of welded pipe forming technology, and in particular to a special plate rolling machine for welded pipes and its usage method. Background Technology

[0002] Plate rolling machines belong to the bending and straightening machine category among the eight major categories of forging and pressing machinery. They are metal forming equipment that uses the principle of three points forming a circle and the relative position change and rotational motion of the working rollers to make the plate continuously elasto-plastic bend to obtain a predetermined shape and precision.

[0003] The existing three-roll plate bending machine for rolling cylindrical shapes includes a left frame, an upper roll, a lower roll mechanism, a right frame, a base, a main hydraulic cylinder, a main drive mechanism, and a tilting mechanism. The upper roll is a passive roll, consisting of one unit, providing the pressing force for bending the plate. The lower roll mechanism includes two lower rolls and a support roll; the lower roll is the active roll, providing the torsional power for rolling the plate. The left and right frames are welded frame structures, fixed to the base, serving as the final load-bearing carriers for the rolling force. Two main hydraulic cylinders drive the upper roll downwards to provide the necessary pressure for rolling the plate. The main drive mechanism, consisting of a motor, a reducer, and a universal coupling, drives the two lower rolls and provides torque for the rotational motion of the plate bending. The tilting mechanism is driven by a tilting cylinder, allowing the left frame to tilt and reset for easy workpiece unloading. With this type of three-roll plate bending machine, when rolling long cylinders, the upper roll experiences significant deflection, thus compromising the straightness of the cylinder. Summary of the Invention

[0004] To address some or all of the technical problems existing in the prior art, this invention provides a special plate rolling machine for welded pipes and its usage method. The technical solution is as follows:

[0005] In a first aspect, a special plate rolling machine for welded pipes is provided, comprising: a frame including a lower crossbeam and an upper crossbeam; two parallel lower rollers, each mounted on the lower crossbeam, with their ends connected to a lower roller drive; an upper roller, mounted above and between the two lower rollers, with its end connected to an upper roller drive; a drive-end reverse bending cylinder and a passive-end reverse bending cylinder, mounted at both ends of the lower crossbeam and opposite to the ends of the upper roller, for lifting the ends of the upper roller; two pressing devices, spaced apart and opposite to each other on the upper crossbeam, for applying pressure to the upper roller during downward movement; and a support crossbeam, detachably connected at both ends to the two pressing devices, for applying pressure to the upper roller during downward movement of the pressing devices.

[0006] In some alternative implementations, the upper roller is detachable and can be replaced with an upper roller of a different diameter.

[0007] In some alternative implementations, the frame further includes two columns located on the front and rear sides of the lower crossbeam, respectively, and each pressing device is slidably connected to the two columns.

[0008] In some alternative implementations, the support beam is suspended on the upper beam in a standby state.

[0009] In some alternative implementations, a plurality of support rollers are provided at the lower part of the support beam, and the plurality of support rollers are spaced apart along the length direction of the support beam.

[0010] In some alternative implementations, a discharge roller conveyor is also included, which is disposed on the lower crossbeam for feeding the tube after the winding is completed.

[0011] Secondly, a method for using a special plate rolling machine for welded pipes as described in any of the preceding claims is provided, including:

[0012] When rolling a tube with a diameter greater than or equal to a preset value, the deflection of the upper roller is controlled by a reverse bending method, including the following steps:

[0013] Align the centerline of the steel plate to be rolled along its length with the centerline of the welded pipe rolling machine, and then feed the steel plate to be rolled laterally between the upper and lower rollers.

[0014] Disassemble the support beam, and the pressing device descends to transfer pressure to the upper roller. The upper roller descends in conjunction with the lower roller to bend the steel plate into a certain curvature. At this time, the upper roller is in an upward deflection state.

[0015] The driving end anti-bending cylinder and the passive end anti-bending cylinder rise, lifting both ends of the upper roller to eliminate the deflection of the upper roller.

[0016] The upper roller drive and the two lower roller drives are activated, driving the three rollers to rotate and roll the steel plate into a tube with a predetermined curvature.

[0017] When rolling a tube with a diameter smaller than a preset value, the deflection of the upper roller is controlled by a support beam, including the following steps:

[0018] Align the centerline of the steel plate to be rolled along its length with the centerline of the welded pipe rolling machine, and then feed the steel plate to be rolled laterally between the upper and lower rollers.

[0019] Install the support beam, lower the pressing device to transmit pressure to the support beam, the support beam drives the upper roller to descend, and the descending upper roller cooperates with the lower roller to bend the steel plate into a certain curvature. The rigidity of the upper roller is ensured by the rigidity of the support beam.

[0020] The upper roller drive and the two lower roller drives are activated, driving the three rollers to rotate and roll the steel plate into a tube with a predetermined curvature.

[0021] In some alternative implementations, after the steel plate is rolled into a tube with a predetermined curvature, the upper roller is lifted to move away from the inner wall of the tube, and the discharge roller conveyor supports the tube and outputs the tube from the plate rolling machine.

[0022] The main advantages of the technical solution of this invention are as follows:

[0023] The welded pipe-specific plate rolling machine and its method of use of the present invention, when rolling pipes with larger diameters, use a drive-end reverse bending cylinder and a passive-end reverse bending cylinder to support the upper roller at both ends, eliminating the deflection of the upper roller. When rolling pipes with smaller diameters, the rigidity of the upper roller is ensured by the rigidity of the support beam, so that the head, middle and tail of the steel plate bend with the same curvature during the rolling process, ensuring the rolling quality. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0025] Figure 1 This is a front view of a special plate rolling machine for welded pipes provided in an embodiment of the present invention;

[0026] Figure 2 A side view of the rolling state of a special plate rolling machine for welded pipes provided in an embodiment of the present invention;

[0027] Figure 3 This is a side view of a welded pipe-specific plate rolling machine in a non-working state according to an embodiment of the present invention;

[0028] Figure 4 This is a top sectional view of a special plate rolling machine for welded pipes provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Lower crossbeam, 2-Upper crossbeam, 3-Lower roller, 4-Lower roller drive, 5-Upper roller, 6-Upper roller drive, 7-Drive end reverse bending cylinder, 8-Passive end reverse bending cylinder, 9-Pressing device, 10-Support crossbeam, 11-Column, 12-Discharge roller conveyor. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] In a first aspect, embodiments of the present invention provide a special plate rolling machine for welded pipes, as shown in the attached figure. Figures 1 to 4 As shown, the machine includes: a frame, comprising a lower crossbeam 1 and an upper crossbeam 2; two opposing lower rollers 3, each mounted on the lower crossbeam 1, with lower roller drives 4 connected to the ends of the two lower rollers 3; an upper roller 5, mounted above and between the two lower rollers 3, with an upper roller drive 6 connected to the end of the upper roller 5; a drive-end reverse bending cylinder 7 and a passive-end reverse bending cylinder 8, mounted at both ends of the lower crossbeam 1 and opposite to the ends of the upper roller 5, for lifting the ends of the upper roller 5; two pressing devices 9, spaced apart and opposite to each other on the upper crossbeam 2, for applying pressure to the upper roller 5 during downward movement; and a support crossbeam 10, detachably connected at both ends to the two pressing devices 9, for applying pressure to the upper roller 5 during downward movement of the pressing devices 9.

[0034] The working principle of the welded pipe special plate rolling machine provided in the embodiments of the present invention is explained below:

[0035] The welded pipe special plate rolling machine provided in this embodiment can generally roll products with the following specifications: Φ508-Φ1422mm, wall thickness: 6-40mm, length: 8-12.5m, steel grade: A25-X100.

[0036] When rolling a tube with a diameter greater than or equal to a preset value (which can be determined by those skilled in the art, for example, ≥711mm), the deflection of the upper roller 5 is controlled by the reverse bending method, including the following steps:

[0037] Align the centerline of the steel plate to be rolled along its length with the centerline of the welded pipe rolling machine, and then feed the steel plate laterally between the upper roller 5 and the lower roller 3. A schematic diagram of the states of the upper roller 5 and the lower roller 3 at this point can be found in the appendix. Figure 2 After disassembling the support beam 10, the pressing device 9 moves down to transfer pressure to the upper roller 5. The upper roller 5 descends in conjunction with the lower roller 3 to bend the steel plate into a certain curvature. At this time, the upper roller 5 is in an upward deflection state. A schematic diagram of the states of the upper roller 5 and the lower roller 3 at this time can be found in the attached diagram. Figure 3 The drive-end reverse bending cylinder 7 and the passive-end reverse bending cylinder 8 rise, lifting both ends of the upper roller 5 and eliminating the deflection of the upper roller 5. The upper roller drive 6 and the two lower roller drives 4 are activated, driving the three rollers to rotate and roll the steel plate into a tube with a predetermined curvature.

[0038] When rolling tubes with a diameter smaller than a preset value (e.g., <711mm), the deflection of the upper roller 5 is controlled by the support beam 10, including the following steps: aligning the centerline of the steel plate to be rolled along its length with the centerline of the welded pipe rolling machine, and then laterally feeding the steel plate between the upper roller 5 and the lower roller 3. Installing the support beam 10, the pressing device 9 descends, transmitting pressure to the support beam 10. The support beam 10 drives the upper roller 5 to descend, and the descent of the upper roller 5, in conjunction with the lower roller 3, bends the steel plate into a certain curvature. The rigidity of the upper roller 5 is ensured by the rigidity of the support beam 10. The upper roller drive 6 and the two lower roller drives 4 are activated, driving the three rollers to rotate and rolling the steel plate into a tube with the predetermined curvature.

[0039] As can be seen, the welded pipe rolling machine provided in this embodiment of the invention, when rolling pipes with larger diameters, uses the drive-end reverse bending cylinder 7 and the passive-end reverse bending cylinder 8 to support the upper roller 5 at both ends, eliminating the deflection of the upper roller 5. When rolling pipes with smaller diameters, the rigidity of the supporting beam 10 ensures the rigidity of the upper roller 5, so that the head, middle and tail of the steel plate bend to the same curvature during the rolling process, ensuring the rolling quality.

[0040] In some optional implementations of this embodiment, the upper roller 5 is detachable and replaceable with upper rollers 5 of different diameters. Optionally, when rolling tubes with a larger diameter (e.g., ≥711mm), a larger diameter upper roller 5 can be selected, for example, the diameter of the upper roller can be 640mm, 650mm, 660mm, etc. When rolling tubes with a smaller diameter (<711mm), a smaller diameter upper roller 5 can be selected. For example, the diameter of the upper roller can be 190mm, 200mm, 210mm. By selecting upper rollers 5 of different diameters for tubes with different diameters, and by using different deflection control methods for upper rollers 5 of different diameters, the forming quality of the rolled tubes can be improved.

[0041] The aforementioned drive-end reverse bending cylinder 7 is located on the side of the upper roller 5 closest to the upper roller drive 6, while the passive-end reverse bending cylinder 8 is located on the other side of the upper roller 5. Both reverse bending cylinders are hydraulic cylinders, with their cylinder bodies mounted on the lower crossbeam 1. When the piston rod extends, it lifts both sides of the upper roller 5.

[0042] In some optional implementations of this embodiment, as shown in the appendix... Figure 2 and 3 As shown, the frame also includes two columns 11, which are respectively located on the front and rear sides of the lower crossbeam 1. Each pressing device 9 is slidably connected to the two columns 11. In this arrangement, the columns 11 guide the pressing device 9 and prevent it from shifting.

[0043] Among them, with attachment Figure 1Based on the direction shown, during use, the lower crossbeam 1 and the two columns 11 are fixed on the installation foundation. The two columns 11 are respectively set on the front and rear sides of the lower crossbeam 1. The two ends of the pressing device 9 are limited to the slide rails on the columns 11 through the slide rails or sliders to achieve sliding connection.

[0044] The pressing device 9 is installed on the upper crossbeam 2. Optionally, there are two upper crossbeams 2, which are symmetrically arranged at the same height, so as to provide good support for the pressing device 9 and improve balance and stability.

[0045] In this embodiment, the support beam 10 is detachable and has two states: a standby state and a usage state. In the standby state, it does not contact the upper roller 5 and is only installed between the two pressing devices 9 when needed. Optionally, in the standby state, the support beam 10 is suspended on the upper beam 2. This arrangement ensures that the support beam 10 does not interfere with the winding process in the standby state.

[0046] The aforementioned support beam 10 can be detachably connected to the pressing device 9 by means of bolt connection, snap-fit ​​or plug-in connection. In this embodiment, there is no specific limitation on this, as long as it can move with the pressing device 9 and will not be displaced or deformed when subjected to force.

[0047] In this embodiment, the upper crossbeam 2 is connected to the pressing device 9. The height of the support crossbeam 10 when it is suspended on the upper crossbeam 2 is higher than the height of the support crossbeam 10 when it is connected between the two pressing devices 9, so that the support crossbeam 10 in the standby state will not contact the upper roller 5 and interfere with the winding process.

[0048] In this embodiment, the support beam 10 applies pressure to the upper roller 5 during use, and the rigidity of the upper roller 5 is ensured by the rigidity of the support beam 10. Optionally, a plurality of support rollers are provided at the lower part of the support beam 10, and the plurality of support rollers are distributed at intervals along the length direction of the support beam 10. By providing a plurality of support rollers on the support beam 10, the support rollers support the upper roller 5, thereby ensuring the rigidity of the upper roller 5.

[0049] Multiple support rollers are distributed along the length of the support beam 10 (which is also the length of the upper roller 5) to apply pressure evenly to the upper roller 5 and control the deflection of the upper roller 5.

[0050] Optionally, as shown in the appendix Figure 1 and attached Figure 4 As shown, the welded pipe special plate rolling machine provided in this embodiment also includes a discharge roller conveyor 12, which is set on the lower crossbeam 1 and is used to send the pipe out after rolling is completed. By setting the discharge roller conveyor 12, it is convenient to send the rolled pipe out of the plate rolling machine, which facilitates operation and avoids deformation of the pipe due to external force interference during the discharge process.

[0051] Secondly, embodiments of the present invention provide a method of using the welded pipe-specific plate rolling machine as described in any of the above claims, including:

[0052] When rolling a tube with a diameter greater than or equal to a preset value, the deflection of the upper roller 5 is controlled by a reverse bending method, including the following steps:

[0053] Align the centerline of the steel plate along its length with the centerline of the welded pipe rolling machine, and then feed the steel plate laterally between the upper roller 5 and the lower roller 3. The alignment of the centerline of the steel plate along its length with the centerline of the welded pipe rolling machine means that the centerline of the steel plate along its length is parallel and aligned with the centerlines of the upper roller 5 and the lower roller 3, with the edge of the steel plate located between the upper roller 5 and the lower roller 3. At this point, moving the steel plate laterally will feed it between the upper roller 5 and the lower roller 3.

[0054] The support beam 10 is disassembled, and the pressing device 9 descends to transmit pressure to the upper roller 5. The upper roller 5 descends and cooperates with the lower roller 3 to bend the steel plate into a certain curvature. At this time, the upper roller 5 is in an upward bending state.

[0055] The driving end reverse bending cylinder 7 and the passive end reverse bending cylinder 8 rise, lifting both ends of the upper roller 5 and eliminating the deflection of the upper roller 5.

[0056] The upper roller drive 6 and the two lower roller drives 4 are activated, driving the three rollers to rotate and roll the steel plate into a tube with a predetermined curvature.

[0057] When rolling a tube with a diameter smaller than a preset value, the deflection of the upper roller 5 is controlled by the support beam 10, including the following steps:

[0058] Align the centerline of the steel plate to be rolled along its length with the centerline of the welded pipe rolling machine, and then feed the steel plate laterally between the upper roller 5 and the lower roller 3.

[0059] The support beam 10 is installed, and the pressing device 9 descends, transmitting pressure to the support beam 10. The support beam 10 drives the upper roller 5 to descend. The descent of the upper roller 5, in conjunction with the lower roller 3, bends the steel plate into a certain curvature. The rigidity of the upper roller 5 is ensured by the rigidity of the support beam 10.

[0060] The upper roller drive 6 and the two lower roller drives 4 are activated, driving the three rollers to rotate and roll the steel plate into a tube with a predetermined curvature.

[0061] The method of using the welded pipe rolling machine provided in this embodiment of the invention eliminates the deflection of the upper roller 5 by supporting the upper roller 5 at both ends through the drive-end reverse bending cylinder 7 and the passive-end reverse bending cylinder 8 when rolling pipes with larger diameters. When rolling pipes with smaller diameters, the rigidity of the upper roller 5 is ensured by the rigidity of the support beam 10, so that the head, middle and tail of the steel plate bend with the same curvature during the rolling process, thus ensuring the rolling quality.

[0062] Optionally, after the steel plate is rolled into a tube with a predetermined curvature, the upper roller 5 is lifted to move away from the inner wall of the tube, and the discharge roller conveyor 12 supports the tube and outputs the tube from the plate rolling machine.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A special plate rolling machine for welded pipes, characterized in that, include: The frame includes a lower crossbeam and an upper crossbeam; Two parallel lower rollers are respectively mounted on the lower crossbeam, and the ends of the two lower rollers are respectively connected to a lower roller drive. An upper roller is disposed above and between the two lower rollers, and an upper roller drive is connected to the end of the upper roller; The upper roller is detachable and can be replaced with an upper roller of different diameter; The drive-end reverse bending cylinder and the passive-end reverse bending cylinder are located at both ends of the lower crossbeam and are respectively opposite to the two ends of the upper roller, and are used to lift the two ends of the upper roller. Two pressing devices are respectively installed on the upper crossbeam to apply pressure to the upper roller during downward movement; The frame also includes two columns, which are located on the front and rear sides of the lower crossbeam respectively, and each pressing device is slidably connected to the two columns. A support beam is detachably connected at both ends to the two pressing devices for applying pressure to the upper roller when the pressing devices move downward; The supporting crossbeam is suspended on the upper crossbeam in the standby state; The lower part of the support beam is provided with a plurality of support rollers, which are spaced apart along the length of the support beam. It also includes a discharge roller conveyor, which is set on the lower crossbeam and is used to send the tube out after the rolling is completed.

2. A method of using the welded pipe special plate rolling machine as described in claim 1, characterized in that, include: When rolling a tube with a diameter greater than or equal to a preset value, the deflection of the upper roller is controlled by a reverse bending method, including the following steps: Align the centerline of the steel plate to be rolled along its length with the centerline of the welded pipe rolling machine, and then feed the steel plate to be rolled laterally between the upper and lower rollers. The pressing device descends and transmits pressure to the upper roller. The upper roller descends in conjunction with the lower roller to bend the steel plate into a certain curvature. At this time, the upper roller is in an upward deflection state. The driving end anti-bending cylinder and the passive end anti-bending cylinder rise, lifting both ends of the upper roller to eliminate the deflection of the upper roller. The upper roller drive and the two lower roller drives are activated, driving the three rollers to rotate and roll the steel plate into a tube with a predetermined curvature. When rolling a tube with a diameter smaller than a preset value, the deflection of the upper roller is controlled by a support beam, including the following steps: Align the centerline of the steel plate to be rolled along its length with the centerline of the welded pipe rolling machine, and then feed the steel plate to be rolled laterally between the upper and lower rollers. Install the support beam, lower the pressing device to transmit pressure to the support beam, the support beam drives the upper roller to descend, and the descending upper roller cooperates with the lower roller to bend the steel plate into a certain curvature. The rigidity of the upper roller is ensured by the rigidity of the support beam. The upper roller drive and the two lower roller drives are activated, driving the three rollers to rotate and roll the steel plate into a tube with a predetermined curvature.

3. The method of using the welded pipe special plate rolling machine according to claim 2, characterized in that, After the steel plate is rolled into a tube with a predetermined curvature, Lift the upper roller to move it away from the inner wall of the tube. The discharge roller conveyor supports the tube and outputs the tube to the plate rolling machine.

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