Plate rolling machine for producing thick-wall long longitudinal welded pipe

Abstract

The utility model provides a plate rolling machine for producing thick-wall long longitudinal welded pipes, which comprises a base, a plate rolling machine, a plate rolling machine, a plate rolling machine, a plate rolling machine and a plate rolling machine, the two lower roller moving seats are arranged on the base; the two lower rollers are respectively arranged on the two lower roller moving seats; the upper roller is arranged above the two lower rollers, the middle portion of the upper roller is thickened, the two ends of the upper roller are further supported by a first reverse supporting device and a second reverse supporting device respectively, and the first reverse supporting device and the second reverse supporting device respectively comprise a pair of reverse supporting rollers to conduct reverse bending supporting on the upper roller. The utility model aims to solve the problem that a plate bending machine is used for producing a thick-wall long longitudinal welded pipe under the condition of large size, realizes one-time roll bending forming of the longitudinal welded pipe, is high in production efficiency, improves the problem that an upper roller is easy to bend during production under the condition of large size, and relieves the problem possibly caused by bending of the upper roller.

Description

Technical Field

[0001] The utility model relates to the technical field of straight seam welded pipe production, in particular to a plate rolling machine used for the production of thick-walled long straight seam welded pipes. Background Art

[0002] At present, most of the production processes of thick-walled and long straight seam welded pipes on the market adopt JCOE or UOE production lines.

[0003] The JCOE production process uses a hydraulic press with upper and lower molds to first press one end of the steel plate into an arc close to a semicircle, and then press the other end of the steel plate into an arc close to a semicircle, and then push the open arc tube out of the hydraulic press, and then join the arc tube offline, and then perform precision welding on the joints. After precision welding, the steel tube is expanded to a full circle.

[0004] The UOE production process uses a hydraulic press with upper and lower U-shaped dies to first press the steel plate into a U shape, then send the U-shaped steel plate to a production unit with upper and lower circular dies to press it into a circle, and then push the open arc tube out of the press, close the seams offline, and then fine weld the seams. After fine welding, the steel tube is expanded to a full circle. Whether it is the JCOE process or the UOE process, there are many production steps, low production efficiency, and large equipment investment. For thick-walled, long straight seam welded pipes, it is best to form them in one step through a plate rolling machine, which has the highest production efficiency.

[0005] The current preparation machinery for rolled steel pipes is mainly a three-roll plate rolling machine. The three-roll plate rolling machine generally includes an upper roller and two lower rollers, and the steel plate is squeezed by the upper and lower rollers to form a tube shape. However, for the current plate rolling machine, the current specifications cannot meet the production requirements for thick-walled and long straight seam welded pipes, so the JCOE production process or UOE production process has to be adopted. For example, in the aforementioned JCOE process, "first press one end of the steel plate into sections" and "then press the other end of the steel plate into sections" because the current specifications do not meet the requirements.

[0006] The utility model attempts to provide a plate rolling machine for producing thick-walled long straight seam welded pipes, which attempts to solve the problem of using a plate rolling machine to produce thick-walled long straight seam welded pipes under large-size conditions. Utility Model Content

[0007] The utility model provides a plate rolling machine for producing thick-walled long straight seam welded pipes, which attempts to solve the problem of using a plate rolling machine to produce thick-walled long straight seam welded pipes under large-size conditions, and has one-time rolling and forming, and high production efficiency.

[0008] The utility model provides a plate rolling machine for the production of thick-walled long straight seam welded pipes, comprising: a base, a frame extending vertically upward from the side of the base, the frame being located at both ends of the base; a lower roller moving seat, two lower roller moving seats being arranged on the base, the two lower roller moving seats extending along the length direction of the base, and the two lower roller moving seats being able to move toward each other to adjust the distance between each other; a lower roller, two lower rollers being respectively arranged on two lower roller moving seats, a plurality of supporting roller pairs being arranged on the lower roller moving seats, each supporting roller pair comprising two supporting rollers, the plurality of supporting roller pairs being used to support the lower roller; and an upper roller, the upper roller being arranged above the two lower rollers, the middle part of the upper roller being thickened, the two ends of the upper roller being respectively supported by a first anti-support device and a second anti-support device, the first anti-support device and the second anti-support device each comprising a pair of anti-support rollers to support the upper roller.

[0009] Furthermore, a plurality of roller pairs are arranged on the lower roller moving seat, each roller pair includes two rollers in a pair, and the roller pair is lower than the supporting roller pair. When the lower roller contacts the roller pair, the roller pair provides certain support to the lower roller.

[0010] Furthermore, a positioning block is provided on the lower roller moving seat, and the positioning block is used to limit the distance between the two lower roller moving seats in stages.

[0011] Furthermore, the upper roller is driven by an upper roller transmission motor, and the lower rollers are driven by respective lower roller transmission motors.

[0012] Furthermore, a pair of pressure rollers are arranged above the upper roller, and the pressure rollers apply downward pressure to the upper roller. The pressure rollers are driven by a prestressed oil cylinder, and the prestressed oil cylinder is arranged on the frame.

[0013] Furthermore, a pair of alignment blocks are provided on the base to limit the moving range of the lower roller moving seat.

[0014] Furthermore, a plurality of rollers are arranged between the two lower rollers on the base, and the rollers are liftable motor-driven rollers for conveying the rolled steel pipes out of the plate rolling machine.

[0015] The utility model provides a plate rolling machine for the production of thick-walled long straight seam welded pipes, which attempts to solve the problem of using a plate rolling machine to produce thick-walled long straight seam welded pipes under large-size conditions, realizes one-time rolling and bending of straight seam welded pipes, has high production efficiency, and improves the problem that the upper roller is easy to bend during production under large-size conditions, thereby alleviating the problems that may be caused by the deflection of the upper roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Shown is a schematic diagram of the main structure of a plate rolling machine for producing thick-walled long straight seam welded pipes provided by an embodiment of the utility model.

[0017] Figure 2 The figure shows a side structural schematic diagram of a plate rolling machine for producing thick-walled long straight seam welded pipes provided by an embodiment of the utility model.

[0018] Reference numerals:

[0019] 1: first counter-support device; 2: upper roller; 3: frame; 4: lower roller; 5: supporting roller pair; 6: idler roller; 7: base; 8: positioning block; 9: lower roller moving seat; 10: transmission shaft; 11: upper roller transmission motor; 12: lower roller transmission motor; 13: prestressed cylinder; 14: second counter-support device; 15: pressure roller; 16: alignment block. DETAILED DESCRIPTION

[0020] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0021] Figure 1 Shown is a schematic diagram of the main structure of a plate rolling machine for producing thick-walled long straight seam welded pipes provided by an embodiment of the utility model. Figure 2 The figure shows a side structural schematic diagram of a plate rolling machine for producing thick-walled long straight seam welded pipes provided by an embodiment of the utility model.

[0022] like Figure 1 As shown, the embodiment of the utility model provides a plate rolling machine for the production of thick-walled long straight seam welded pipes, including: a base 7, a frame 3 extending vertically upward from the side of the base 7, and the frame 3 is located at both ends of the base 7; a lower roller moving seat 9, two lower roller moving seats 9 are arranged on the base 7, and the two lower roller moving seats 9 extend along the length direction of the base 7, and the two lower roller moving seats 9 can move toward each other to adjust the distance between each other; a lower roller 4, two lower rollers 4 are respectively arranged on two lower roller moving seats 9, and a plurality of supporting roller pairs 5 are arranged on the lower roller moving seats 9, each supporting roller pair 5 includes two supporting rollers, and the plurality of supporting roller pairs 5 are used to support the lower roller 4; and an upper roller 2, the upper roller 2 is arranged above the two lower rollers 4, the middle part of the upper roller 2 is thickened, and the two ends of the upper roller 2 are also supported by a first anti-support device 1 and a second anti-support device 14, respectively, and the first anti-support device 1 and the second anti-support device 14 each include a pair of anti-support rollers to support the upper roller 2. A plurality of roller pairs 6 are arranged on the lower roller moving seat 9, and the roller pairs 6 are driven by a lifting motor to transport the rolled steel pipe out of the plate rolling machine. A positioning block 8 is arranged on the lower roller moving seat 9, and the positioning block 8 is used to limit the distance between the two lower roller moving seats 9 in stages. The upper roller 2 is driven by an upper roller drive motor 11, and the lower rollers 4 are driven by their respective lower roller drive motors 12.

[0023] like Figure 2 As shown, a pair of pressure rollers 15 are arranged above the upper roller 2, and the pressure rollers 15 exert downward pressure on the upper roller 2. The pressure rollers 15 are driven by a prestressed oil cylinder 13, and the prestressed oil cylinder 13 is arranged on the frame 3. A pair of alignment blocks 16 are also arranged on the base 7 to limit the movement range of the lower roller moving seat 9.

[0024] The plate rolling machine for producing thick-walled long straight seam welded pipes in the embodiment of the utility model is also a three-roller plate rolling machine, and therefore, it also has a structure similar to that of the three-roller plate rolling machine, such as an upper roller 2 located at the upper part and two lower rollers 4 located at the lower part, and the steel plate is deformed by the extrusion of the upper roller 2 and the two lower rollers 4. However, since the embodiment of the utility model attempts to solve the problem of using a plate rolling machine to produce thick-walled long straight seam welded pipes under large-size conditions, and to achieve one-time rolling and forming of straight seam welded pipes, corresponding improvements must be made in structure.

[0025] The existing three-roller plate rolling machine is of insufficient specifications and has limited processing capacity, so as described in the background technology, the steel plates must be bent "piece by piece". In the embodiment of the utility model, in order to realize the production of thick-walled long straight seam welded pipes, the size of the upper roller and the two lower rollers must also be increased, so the length of the upper roller and the lower roller becomes longer. Regardless of whether it is an upper roller or a lower roller, once the length increases, deformation problems are prone to occur under the action of gravity. For example, in the prior art, the lower roller is mainly supported at both ends, while the support in the middle part is relatively less. In order to support the lower roller, a plurality of support roller pairs 5 are arranged on the lower roller moving seat 9. For example, 12 support roller pairs 5 are arranged on the lower roller moving seat 9 to provide support for the lower roller 4. An additional pair of rollers 6 is also arranged on the lower roller moving seat 9 to transport the rolled steel pipe out of the plate rolling machine.

[0026] As the length increases, the upper roller 2 also faces deformation problems under the action of gravity. Since the middle part of the upper roller 2 has no support, under the action of gravity, the middle part of the upper roller 2 is prone to sinking relatively. In addition, the upper roller 2 will rotate, so the upper roller 2 is prone to bend. This situation not only affects the product quality, but also affects the service life of the upper roller 2, and also poses a hidden danger to the safety of on-site personnel. In order to alleviate the deflection of the upper roller 2, the applicant thickened the middle part of the upper roller 2. Since the middle part of the upper roller 2 is thickened, the middle part of the upper roller 2 is more difficult to deform and can better withstand deflection. Moreover, on the one hand, if Figure 2 As shown, the upper roller 2 is subjected to pressure from a pair of pressure rollers 15 above it. Figure 1As shown, the upper roller 2 is supported by the first anti-support device 1 and the second anti-support device 14 at both ends, so that the upper roller 2 has an anti-deformation force, reduces the risk of deformation, and ensures that the upper roller is straight during operation. At the same time, the upper roller 2 rotates under the drive of the upper roller drive motor 11, and the steel plate is rolled by the rotation of the motors of the upper roller 2 and the lower roller 4, and the steel plate is rolled into a tube.

[0027] Compared with the multi-step forming methods of JCOE or UOE in the prior art, the present invention adopts one-time rolling and bending, and the production efficiency is significantly higher than the prior art. Since the long tube is rolled and bent once, the upper roller is too long. In order to ensure that the steel tube forming is not affected by the deflection deformation of the upper roller during the rolling process, the upper roller is partially thickened according to calculations during the production of the upper roller to resist deflection deformation; during curling, the prestressed oil cylinder generates a downward deformation force on the upper roller through the pressure roller. Since the upper roller is too long, production will produce upward deflection. According to different wall thicknesses, pipe diameters, and materials, the counter-support roller generates a downward deformation force on the upper roller to offset the upward deflection deformation of the upper roller caused by the load to meet production needs. The invention adapts to different pipe diameters, wall thicknesses, and pipe lengths by adjusting the different prestress and counter-support forces of the upper roller; it has high production efficiency, high product qualification rate, standard steel pipe appearance, low internal stress of the steel pipe, and equipment investment is only 50% of JCOE.

[0028] The embodiment of the utility model belongs to steel pipe production equipment, which is mainly used to produce thick-walled and long straight seam submerged arc welded pipes. It fills the gap in the relevant domestic fields in terms of technology, can produce thick-walled straight seam steel pipes, and can be rolled and formed in one time with high production efficiency. The equipment can roll and form thick-walled straight seam steel pipes with a length of not less than 12 meters in one time, without the need for pipe body docking. The equipment production process is simple and the equipment performance is reliable; the equipment has a complete production adjustment database, and the equipment adjustment can realize automatic control with a high degree of automation; the production line adopts an automatic welding device and a matching laser tracking device to ensure real-time tracking of the weld, which can meet various welding requirements, such as submerged arc, gas shielding, laser and other welding requirements, and the weld quality is reliable. The overall equipment design is reasonable, and the product quality can meet the relevant standards for pipes.

[0029] The utility model provides a plate rolling machine for the production of thick-walled long straight seam welded pipes, which attempts to solve the problem of using a plate rolling machine to produce thick-walled long straight seam welded pipes under large-size conditions, realizes one-time rolling and bending of straight seam welded pipes, has high production efficiency, and improves the problem that the upper roller is easy to bend during production under large-size conditions, thereby alleviating the problems that may be caused by the deflection of the upper roller.

[0030] In the description of the present invention, it is necessary to understand that the terms “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, any changes and modifications made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A plate rolling machine for producing thick-walled long straight seam welded pipes, comprising: A base, with a frame extending vertically upward from a side of the base, and the frame is located at two ends of the base; Characterized in that the plate rolling machine for the production of thick-walled long straight seam welded pipes also includes: A lower roller moving seat, wherein two lower roller moving seats are arranged on the base, the two lower roller moving seats extend along the length direction of the base, and the two lower roller moving seats can move toward each other to adjust the distance between them; Lower rollers, wherein the two lower rollers are respectively arranged on two lower roller moving seats, and a plurality of supporting roller pairs are arranged on the lower roller moving seats, each supporting roller pair includes two supporting rollers, and the plurality of supporting roller pairs are used to support the lower rollers; and An upper roller, wherein the upper roller is arranged above the two lower rollers, the middle part of the upper roller is thickened, and both ends of the upper roller are also supported by a first anti-support device and a second anti-support device respectively, and the first anti-support device and the second anti-support device each include a pair of anti-support rollers to support the upper roller.

2. The plate rolling machine for producing thick-walled long straight seam welded pipes according to claim 1 is characterized in that: A plurality of roller pairs are arranged on the lower roller moving seat, each roller pair comprises two rollers in a pair, and the rollers are liftable motor-driven rollers used to transport the rolled steel pipes out of the plate rolling machine.

3. The plate rolling machine for producing thick-walled long straight seam welded pipes according to claim 2 is characterized in that: A positioning block is arranged on the lower roller moving seat, and the positioning block is used to limit the distance between the two lower roller moving seats in stages.

4. The plate rolling machine for producing thick-walled long straight seam welded pipes according to claim 3 is characterized in that: The upper roller is driven by an upper roller drive motor, and the lower rollers are driven by respective lower roller drive motors.

5. The plate rolling machine for producing thick-walled long straight seam welded pipes according to claim 4 is characterized in that: A pair of pressure rollers are arranged above the upper roller, and the pressure rollers apply downward pressure to the upper roller. The pressure rollers are driven by a prestressed oil cylinder, and the prestressed oil cylinder is arranged on the frame.

6. The plate rolling machine for producing thick-walled long straight seam welded pipes according to claim 5 is characterized in that: A pair of alignment blocks are also arranged on the base to limit the moving range of the lower roller moving seat.

7. The plate rolling machine for producing thick-walled long straight seam welded pipes according to claim 6 is characterized in that: A plurality of lifting motor-driven rollers are also arranged on the base between the two lower rollers to transport the rolled steel pipes out of the plate rolling machine.

Images