JP6022030B1 - Steel pipe manufacturing equipment - Google Patents

Abstract

In a manufacturing facility for manufacturing a large-diameter steel pipe, a steel pipe manufacturing facility capable of preventing twisting of a steel sheet caused by a difference in peripheral speed between forming rolls of a breakdown device without increasing the size of the entire apparatus is provided. A steel pipe manufacturing facility 10 that continuously moves a steel plate 12 to form a circular large-diameter steel pipe 11 and includes a breakdown device 30 that forms the steel plate 12 in an arc shape. The breakdown device 30 includes: It has a pair of forming rolls 31 that sandwich the steel plate 12 from above and below to form an arc, and a rotating shaft that pivotally supports the forming roll 31, and the rotating shaft 35 is configured to be drivable from both ends. Is. [Selection] Figure 2

Description

  The present invention relates to a steel pipe manufacturing facility, and more particularly to an apparatus for breakdown forming of a large diameter steel pipe.

  Conventionally, in this type of steel pipe manufacturing equipment, as in Patent Document 1, for example, a steel plate as a raw material is continuously discharged by an uncoiler, and both ends of the discharged steel plate are formed into an arc shape by a breakdown device. Then, a circular hollow steel pipe is manufactured by forming the steel plate into a circular cross section by a fin pass device.

  As shown in FIG. 4 (a), in the breakdown device 100 used in this type of steel pipe manufacturing equipment, a pair of forming rolls 102 is arranged in a vertical direction at a position sandwiching the steel plate 101, and a pair of forming rolls 102 is provided. The steel plate 101 is formed into an arc shape by sandwiching the steel plate 101 therebetween. The pair of forming rolls 102 are attached to a rotating shaft 103, and the rotating shaft 103 rotates by a driving source 104 such as a motor, thereby rotating while pressing the steel plate 101.

JP 2013-132671 A

  However, in the conventional steel pipe manufacturing equipment, as shown in FIG. 4 (a), one end of the rotating shaft 103 is driven as the driving end 103A, so that a long shaft forming roll 102 (the rotating shaft 103) is used. When manufacturing a steel pipe having a diameter, the peripheral speed on one end side (the driving end 103A side of the rotating shaft 103) of the forming roll 102 is the other end side of the forming roll (the side opposite to the driving end 103A side of the rotating shaft 103). Thus, the entire forming roll 102 could not be rotated at a uniform peripheral speed. Therefore, when the steel plate 101 is sandwiched and formed between such forming rolls 102, as shown in FIG. 4B, the steel plate 101 is moved to the other end side of the forming roll 102 having a low peripheral speed (the driving end 103A of the rotating shaft 103). There is a problem that it is impossible to manufacture a large-diameter steel pipe that is formed in an arc shape in a state twisted in the direction opposite to the side and excellent in shape and dimensional characteristics.

  Further, in order to make the peripheral speed of the entire forming roll 102 uniform, a method using a large-diameter forming roll 102 is conceivable. However, when a large-diameter forming roll 102 is used, the large-diameter forming roll 102 is supported. Large bearings are required. Further, in order to arrange the large-diameter forming roll 102 in the vertical direction, it is necessary to provide a sufficient space between the upper and lower rotary shafts 103 and 103. Therefore, there is a problem that the forming roll stand that supports the forming roll 102 becomes large, resulting in an increase in the size of the entire breakdown device.

  Therefore, the present invention provides a steel pipe manufacturing facility capable of preventing the twisting of the steel sheet caused by the difference in the peripheral speed of the forming roll of the breakdown device without increasing the size of the entire apparatus in a manufacturing facility for manufacturing a large diameter steel pipe. The purpose is to provide.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, the steel pipe manufacturing equipment of the present invention is a steel pipe manufacturing equipment for continuously moving a steel plate to form a circular large-diameter steel pipe, and includes a breakdown device for forming the steel plate into an arc shape, and the breakdown device Has a pair of forming rolls that sandwich the steel plate from above and below to form an arc, and a rotating shaft that pivotally supports the forming roll, and the rotating shaft is configured to be drivable from both ends. Is.

  In the above configuration, the forming roll rotates by driving the rotating shaft that pivotally supports the forming roll from both ends thereof.

  The steel pipe manufacturing facility of the present invention comprises a first drive source that drives the rotary shaft from one end of the rotary shaft, and a second drive source that drives the rotary shaft from the other end of the rotary shaft, The first drive source and the second drive source are controlled in synchronization with each other.

  In the above configuration, the rotation shaft is driven from both ends thereof by the first drive source and the second drive source that are controlled in synchronization with each other.

  According to the steel pipe manufacturing facility of the present invention, the entire pair of upper and lower forming rolls can be rotated at a uniform peripheral speed by driving the rotation shafts of the upper and lower pair of forming rolls in the breakdown device from both ends. The torsion of the steel sheet caused by the difference in peripheral speed between the pair of upper and lower forming rolls is prevented. Therefore, it is possible to manufacture a circular large-diameter steel pipe that is formed into an arc shape without being twisted and has excellent shape and dimensional characteristics. In addition, using a pair of upper and lower forming rolls with a large diameter, it is not necessary to suppress the deviation of the peripheral speed at both ends of the rotating shaft, so there is no need to use a large bearing for supporting the rotating shaft with a large diameter, The interval between the upper and lower rotating shafts can be reduced. Therefore, the entire breakdown device can be reduced in size.

It is a side view which shows the steel pipe manufacturing equipment which concerns on embodiment of this invention. It is a front view which shows the breakdown apparatus in the steel pipe manufacturing equipment which concerns on embodiment of this invention. It is a top view which shows the breakdown apparatus in the steel pipe manufacturing equipment which concerns on embodiment of this invention. (A) is a front view which shows the breakdown apparatus in the conventional steel pipe manufacturing equipment, (b) is a top view which shows the breakdown apparatus in the conventional steel pipe manufacturing equipment.

  Hereinafter, steel pipe manufacturing equipment 10 concerning an embodiment of the invention is explained based on a drawing.

  As shown in FIG. 1, in manufacturing a circular tubular large-diameter steel pipe 11 in a steel pipe manufacturing facility 10, a steel plate 12 having a predetermined thickness and length suitable for the large-diameter steel pipe 11 is coiled (rolled). ). The steel plate 12 is rewound by a rewinding device 13 composed of a pinch roller or the like, and then flattened by a leveling device 14. Then, only the unwinding tip portion of the steel plate 12 is cut and removed by the cutting device 15.

  Both sides of the steel plate 12 that has been rewound and continuously moved are cut and removed by the trimming device 16. Next, the steel plate 12 is formed into a gentle R shape by the preform device 17 and then gradually formed into an arc shape by the breakdown device 30.

  In the cluster device 18, the pair of vertical plate portions on the upper portion of the steel plate 12 formed in an arc shape is bent inward. Then, the cylindrical large-diameter steel pipe 11 is gradually formed into a tubular shape by the fin pass device 19 and the pair of side edges are in contact with each other. The tubular large-diameter steel pipe 11 enters the high-frequency resistance welder 20, and after the melting method welding is performed by heating, the outer surface beat is cut by the cutting device 21 and the tubular large-diameter steel pipe 11 having a seam welded portion. Is manufactured.

  Next, the breakdown device 30 provided in the steel pipe manufacturing facility 10 will be described.

  As shown in FIG.2 and FIG.3, the breakdown apparatus 30 is an apparatus which shape | molds the steel plate 12 which is a raw material in circular arc shape. The breakdown device 30 supplies the steel plate 12 from one end thereof, and sandwiches the steel plate 12 between the pair of upper and lower forming rolls 31 provided on each of the plurality of forming roll stands 32 in order from the vertical direction through the steel plate 12. Thus, the steel plate 12 is formed into an arc shape.

  The breakdown device 30 includes a four-stage forming roll stand 32. The forming roll stands 32 are arranged at predetermined intervals along the conveying direction of the steel plate 12. In the present embodiment, the number of stages of the forming roll stand 32 is four. However, the present invention is not limited to this, and the forming roll is formed according to the shape, dimensions, etc. of the cylindrical large-diameter steel pipe 11 to be formed. The number of stages of the stand 32 may be increased or decreased.

  As shown in FIG. 2, the forming roll stand 32 is mainly composed of stand frames 34, 34 provided on a base 33 and provided perpendicular to the base 33. The stand frames 34, 34 support a pair of upper and lower forming rolls 31 so as to be rotatable.

  The pair of upper and lower forming rolls 31 are arranged in the same plane in which the rotation shaft 35 of the pair of upper and lower forming rolls 31 is orthogonal to the longitudinal direction of the steel plate 12. As shown in FIG. 3, the pair of upper and lower forming rolls 31 are configured by forming rolls having different shapes (different roll diameters) according to the position of the forming roll stand 32 arranged. In addition, the pair of upper and lower forming rolls 31 are constituted by forming rolls having different shapes (different roll diameters) even in the same forming roll stand 32.

  As shown in FIGS. 2 and 3, the pair of upper and lower forming rolls 31 are mounted (supported) on the rotation shaft 35. The rotating shaft 35 is rotatably supported by a bearing 36 provided on the stand frames 34, 34.

  One end of the rotary shaft 35 is connected to the output shaft of the speed reducer 38A via the universal joint 37A, and the other end is connected to the output shaft of the speed reducer 38B via the universal joint 37B. A drive motor 39A, which is a first drive source, is connected to the speed reducer 38A, and a drive motor 39B, which is a second drive source, is connected to the speed reducer 38B. That is, the rotation shaft 35 is configured to be driven from both ends by drive motors 39A and 39B arranged on both sides of each forming roll stand 32 (on both sides of the rotation shaft 35). The driving force of the drive motors 39A and 39B is divided and transmitted to the rotating shaft 35 of the upper forming roll 31 and the rotating shaft 35 of the lower forming roll 31 in the speed reducers 38A and 38B.

  The speed reducers 38A and 38B and the drive motors 39A and 39B are connected to a control controller (not shown), and their operations are controlled by the control controller. The said control controller is a main part which controls the steel pipe manufacturing equipment 10, for example, is comprised by memory | storage devices, such as CPU, a memory, a hard disk, etc., and performs control processing according to the control program (or data table) memorize | stored in memory. I do. The controller controls the drive motor 39A and the drive motor 39B in synchronization with each other according to the axial length, shaft diameter, etc. of the rotating shaft 35 of the pair of upper and lower forming rolls 31 to be driven.

  Here, in the steel pipe manufacturing facility 10, the wide steel plate 12 is processed in order to manufacture a large-diameter steel pipe. Therefore, the axial length of the rotary shaft 35 of the pair of upper and lower forming rolls 31 is adjusted to the width of the steel plate 12. Need to be long. When such a long shaft 35 is driven only from one side, a difference in peripheral speed is significantly generated at both ends of the shaft 35. Therefore, in the steel pipe manufacturing facility 10, the control controller controls the drive motor 39A and the drive motor 39B in synchronization with each other so that the peripheral speeds at both ends of the rotary shaft 35 are the same, thereby rotating the rotary shaft. The deviation of the circumferential speed at both ends of 35 is suppressed, and the entire pair of upper and lower forming rolls 31 are rotated at a uniform circumferential speed.

  As described above, according to the above configuration, the pair of upper and lower pairs of upper and lower forming rolls 31 in the breakdown device 30 are driven by the drive motors 39A and 39B controlled from both ends in synchronization with each other. Since the entire forming roll 31 can be rotated at a uniform peripheral speed, the twist of the steel sheet 12 caused by the peripheral speed difference between the pair of upper and lower forming rolls 31 is prevented. Therefore, the steel plate 12 is formed into an arc shape without being twisted, and a circular large-diameter steel pipe 11 having excellent shape and dimensional characteristics can be manufactured.

  Furthermore, since it is not necessary to suppress the deviation of the peripheral speed at both ends of the rotating shaft 35 using the pair of large diameter upper and lower forming rolls 31 (the rotating shaft 35), a large size for supporting the large diameter rotating shaft 35 is used. It is not necessary to use the bearing 36, and the interval between the upper and lower rotary shafts 35 can be reduced. Further, compared to the case where only one end of the rotating shaft 35 is driven, the drive motors 39A and 39B, which are drive sources, can be configured by small drive motors having a small drive force. Therefore, the breakdown device 30 as a whole can be reduced in size.

  In this embodiment, two drive motors 39A and 39B are provided on both sides of the rotary shaft 35, and the rotary shaft 35 is driven by the two drive motors 39A and 39B. However, the present invention is not limited to this. However, as long as the rotary shaft 35 can be driven from both ends, the rotary shaft 35 may be driven by a single drive motor. In the present embodiment, the upper and lower rotary shafts 35 are connected to the two drive motors 39A and 39B via the universal joints 37A and 37B, and the upper and lower rotary shafts 35 are connected by the two drive motors 39A and 39B. However, the present invention is not limited to this, and a single drive motor is provided on both sides of the upper and lower rotary shafts 35 without using the universal joints 37A and 37B. The shaft 35 may be driven.

DESCRIPTION OF SYMBOLS 10 Steel pipe manufacturing equipment 11 Large diameter steel pipe 12 Steel plate 30 Breakdown device 31 Forming roll 35 Rotating shaft 39A Drive motor (1st drive source)
39B Drive motor (second drive source)

Claims (2)

A steel pipe manufacturing facility that continuously moves a steel plate to form a circular large-diameter steel pipe,
A breakdown device for forming the steel sheet into an arc shape;
The breakdown device is:
A pair of forming rolls for pressing the steel plate from above and below to form an arc shape;
A rotating shaft that pivotally supports the forming roll;
Have
The rotating shaft is configured to be drivable from both ends thereof. A first drive source for driving the rotary shaft from one end of the rotary shaft;
A second drive source for driving the rotary shaft from the other end of the rotary shaft;
With
The steel pipe manufacturing facility according to claim 1, wherein the first drive source and the second drive source are controlled in synchronization with each other.

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