JP3709517B2 - Automatic straightening device for welded pipe tabs - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic straightening device for a tab plate used in a manufacturing process of a welded pipe.
[0002]
[Prior art]
When manufacturing a UOE steel pipe, tab plates are attached to both ends of the steel pipe weld line to start and end welding at the locations. Since these tab plates are attached exclusively by manual welding or semi-automatic welding, deformation such as upward warping, downward warping, lateral opening, etc. has occurred. The deformation was corrected.
[0003]
[Problems to be solved by the invention]
However, the correction of the tab plate not only takes a lot of time and man-hours because of manual work, but also the shape after correction varies. Furthermore, since the route gap and the offset amount differ depending on the size of the steel pipe, the work becomes very complicated and accurate correction is difficult.
[0004]
The present invention has been made to solve such problems, and provides an automatic tab plate correction device for a welded pipe that can automatically correct deformations such as upper warping, lower warping, and lateral opening of the tab plate. The purpose is to provide.
[0005]
[Means for Solving the Problems]
An automatic tab plate straightening device for a welded pipe according to the present invention corrects an upper warp correction means for correcting an upper warp of a tab plate, a lower warp correction means for correcting a lower warp of the tab plate, and a lateral opening of the tab plate. A straightening device having a pair of left and right laterally straightening means, the straightening device is mounted on the gantry so as to be movable and moved up and down in the tube axis direction, and further, the tab plate is displaced in the circumferential direction of the original tube. On the other hand, there are provided tilting means for following the entire correction device, and angle adjustment means for changing the correction angle of the lateral opening correction means according to the outer diameter data of the original tube.
[0006]
In the present invention, the upper warp correction means corrects the upper warp by pushing down the tip of the tab plate. The downward warp correction means corrects the downward warp by pushing up the tip of the tab plate. The lateral opening correction means corrects lateral opening by pressing the tab plate from both sides. The angle adjusting means changes the correction angle of the lateral opening correction means (angle in the tangential direction of the outer diameter of the original pipe) in a plurality of stages according to the outer diameter of the original pipe. Since the tab plate is not always in the position directly above the original tube, the tilting means tilts the entire straightening device following the direction in which the tab plate is displaced when it is slightly displaced in the circumferential direction. It is something to be made. As described in claim 3, the tilting means has scissors that can be opened and closed to sandwich the tab plate from both sides.
Since the present correction device is configured as described above, it is possible to automatically correct deformation such as upper warping, lower warping, and lateral opening of the tab plate, and labor saving is possible. In addition, the tab plate can be automatically corrected regardless of the size of the welded pipe.
[0007]
The automatic tab plate straightening device for welded pipes according to the present invention has a tilting frame pivotally attached to an elevating body provided on the gantry, and the upward warping correction means, the downward warping correction means, the lateral opening correction means, and the tilting means. And an angle adjusting means.
[0008]
In this way, by tilting the tilting frame on the lifting body on the gantry by the rotating shaft, by providing the tilting frame with the upward warping correction means, the downward warping correction means, the lateral opening correction means, the tilting means and the angle adjustment means, The correction device can be tilted following the deviation in the circumferential direction of the tab plate. In particular, by providing the tilting means with an openable scissor member that sandwiches the tab plate from both sides, the tilting frame can be rotated around the rotation axis by the reaction force acting on the scissor member from the tab plate. Therefore, the rotational power of the tilting frame becomes unnecessary.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a tab plate automatic straightening device according to the present invention, and FIG. 2 is a schematic diagram showing an arrangement relationship of a tab warp straightening device, a bottom warp straightening device, and a lateral opening straightening device. Details of each of these devices are shown in FIGS.
The correction device main body 10 is attached to a gantry 11 movable in the tube axis direction so as to be movable up and down. A tab plate 2 is attached to the tube end of the original tube 1 so that the groove 3 of the original tube 1 and the groove 4 of the tab plate 2 substantially coincide. The straightening device main body 10 includes an upward warping correction device 12 that corrects the upward warping of the tab plate 2 by a pressing force, a downward warping correction device 13 that corrects the downward warping of the tab plate 2 by an upward force, and the tab plate 2. The correction device main body 10 has a lateral opening correction device 14 that corrects the horizontal opening of the tab plate 2 from both sides and the deviation of the tab plate 2 in the circumferential direction of the original tube 1 with the base of the tab plate 2 interposed therebetween. A tilting device 15 that rotates and follows an axis and an angle adjusting device 16 that changes the correction angle of the lateral opening correction device 14 according to the outer diameter of the original tube 1 are provided. Reference numeral 17 denotes a proximity switch composed of a photoelectric switch or the like, and the gantry 11 stops at a set position from the tube end. Reference numeral 18 denotes a hydraulic device.
[0010]
3 is a front view of the correction device body, FIG. 4 is a side view thereof, FIG. 5 is a front view in which the tilting device is omitted, and FIG. 6 is a side view of FIG. FIG. 7 is an explanatory view showing the tab plate following action of the tilting device.
[0011]
A lifting / lowering body 21 is provided on the column 20 of the gantry 11, and a lifting / lowering body 21 is connected to the guide 25 of the column 20 by rotating a screw shaft 23 connected to the lifting / lowering body 21 via a nut portion 22 by a lifting / lowering motor 24. Go up and down along. In the illustrated example, the entire gantry 11 is movable in the tube axis direction, but the lower portion of the gantry 11 may be fixed, and only the column 20 may be configured to be movable in the tube axis direction.
[0012]
A tilting frame 30 in which the correction device main body 10 is attached to the lifting body 21 is rotatably supported by a rotating shaft 31. Further, an arcuate guide mechanism 32 centering on the rotation shaft 31 is provided between the tilting frame 30 and the elevating body 21.
[0013]
The above-described warpage correction device 12 is composed of a hydraulic cylinder, and is attached to the upper part of the tilting frame 30 so as to push down the tip portions of the tab plates 2 on both sides by a pressing body 33 attached to the tip portion of the cylinder rod. Yes. Reference numerals 34 denote guide mechanisms disposed on both sides of the hydraulic cylinder of the warp correction device 12.
[0014]
Similarly, the downward warp correction device 13 made of a hydraulic cylinder is attached to the tilting frame 30 so as to face the upward warp correction device 12, and the front ends of the tab plates 2 on both sides are pressed by the pressing bodies 35 attached to the front ends of the cylinder rods. I try to push it up. Further, the pressing body 35 extends long so that the upper surface thereof is in contact with the inner surface of the original tube 1. Reference numerals 36 denote guide mechanisms arranged on both sides of the hydraulic cylinder of the downward warp correction device 13. Although not shown in the drawings, the upper warp correction device 12 and its mounting portion of the guide mechanism 34 with the pressing body 33 and the lower warping correction device 13 and its mounting portion of the guide mechanism 36 with the pressing body 35 are electrically insulated. There is something in between.
[0015]
The scissor-shaped tilting device 15 is erected on the front surface portion of the tilting frame 30, and includes a scissor member 37, a fixed shaft 38, a link mechanism 39 coupled to the scissor member 37, and a hydraulic cylinder 40 that opens and closes the scissor member 37. It is configured. The scissor member 37 is pivotally attached to the tilting frame 30 by a fixed shaft 38. The scissor members 37 sandwich the side surfaces of the left and right tab plates 2 from both sides. As a result, the correction device main body 10 as a whole follows the circumferential displacement of the tab plate 2 as will be described later.
[0016]
The lateral opening correction device 14 composed of a pair of left and right hydraulic cylinders is arranged in a “C” shape on both sides of the tilt frame 30 and is further connected to an angle adjustment device 16 composed of an electric cylinder. Further, the lateral opening correction device 14 is pivotally attached to the tilting frame 30 by a pin 41, and the correction angle is adjusted in a plurality of stages by the angle adjustment device 16 so as to be directed in a tangential direction of the outer diameter according to the outer diameter of the original tube 1. Be changed. The side surface of the tip of the tab plate 2 is pressed by the pressing body 42 of each lateral opening correction device 14. The pressing body 42 is attached to the tip of the cylinder rod via an electric insulator (not shown).
[0017]
Next, the operation of the tab plate automatic straightening device configured as described above will be described.
First, the gantry 11 of the tab plate automatic straightening apparatus moves to a set position from the pipe end of the original pipe 1 set by the proximity switch 17 and stops.
Next, based on the outer diameter data of the original pipe 1 read in the automatic tack welding process, which is a previous process, the correction device main body 10 is raised and stopped to a set position by a control panel (not shown). The raising / lowering body 21 is moved up and down by the lifting / lowering body 21, and the lifting / lowering body 21 is lifted / lowered by rotating the screw shaft 23 forward or backward by the lifting / lowering motor 24. Hereinafter, correction such as upper warping, lower warping, and lateral opening of the tab plate 2 is performed as follows.
[0018]
(1) When the upper warp correction tab plate 2 is warped as shown in FIG. 8A, the upper warp correction device 12 is used and the pressing body 33 is used to push the tip of the tab plate 2. Correct by pressing down. The pressing body 33 descends to a position that substantially matches the outer diameter of the original tube 1. 8A is a front view, and FIG. 8A is a sectional side view.
[0019]
(2) When the downward warping correction tab plate 2 is downwardly warped as shown in FIG. 8B, the tip portion of the tab plate 2 is used by the pressing body 35 using the downward warping correction device 13. Correct by pushing up. At this time, the pressing body 35 rises until it contacts the inner surface of the original tube 1.
8B is a front view, and FIG. 8B is a sectional side view.
[0020]
(3) When the laterally opening correction tab plate 2 is in the laterally open state as shown in FIG. 8C, a pair of left and right laterally opening correction devices 14 are used, and the pressing bodies 42 are used on both sides. This is corrected by pressing the side surface of the tip of the tab plate 2. At this time, the correction is performed after adjusting the correction angle of the lateral opening correction device 14 in advance so as to be in the tangential direction of the outer diameter of the original tube 1 by the angle adjustment device 16. The lateral opening can be corrected by adjusting the correction force of the left and right pressing bodies 42 to a set value. Further, the angle adjusting device 16 changes the correction angle in about four steps according to the outer diameter size of the original tube 1. In addition, the (C-1) figure of FIG.8 (C) is a front view, (C-2) figure is a top view.
[0021]
(4) When the offset correction tab plate 2 is offset as shown in FIG. 8D, using both the above-described warp correction device 12 and the lower warp correction device 13, the upper warp and the lower warp are used. Can be corrected at the same time.
[0022]
(5) Follow-up action with respect to circumferential displacement of tab plate Referring to FIG. 7, (A) shows the case where there is no circumferential displacement of tab plate 2, and (B) shows the circumferential direction displacement. This is when there is a gap.
When the tab plate 2 is directly above the original pipe 1 as shown in FIG. (A), as described above, it is possible to correct the upward warping, the downward warping, the lateral opening, and the offset as they are. However, since the original tube 1 is paid out by a walking beam or the like, the tab plate 2 is not necessarily located directly above the original tube 1 and may be slightly displaced in the circumferential direction. . For example, when the tab plate 2 is shifted to the left side as shown in FIG. 5B, when the base portion of the tab plate 2 is sandwiched by the scissors member 37 of the tilting device 15, the left scissor member 37 is moved to the tab plate 2 first. Abuts the side. At this time, a reaction force P acts on the left scissors member 37 from the left tab plate 2, and the tilting frame 30 rotates counterclockwise around the rotation shaft 31 by this reaction force P, thereby the correction device main body 10. Tilt the whole in the same direction. Accordingly, when the left and right tab plates 2 are finally sandwiched from both sides by the left and right scissors members 37, the correction device 10 is inclined at the angle of the center line 45 at the displacement position of the tab plate 2 as shown by the broken line in FIG. Thus, as described above, it is possible to correct the upper warping, lower warping, lateral opening, and offset of the tab plate 2. In this way, by sandwiching the tab plate 2 from both sides with the scissors member 37, the entire correction apparatus main body 10 can follow the circumferential displacement of the tab plate 2.
[0023]
With the above-described configuration and operation, it is possible to automatically correct the upper warping, lower warping, lateral opening, and offset of the tab plate according to the outer diameter of the original tube. Therefore, the variation in shape after correction is extremely small, and the groove shape accuracy is good.
[0024]
In the Example of this invention, it implemented on the following conditions.
(conditions)
(1) Pipe outer diameter φ711.2mm
(2) Tube thickness 16.4mm
(3) Upper warping amount 0mm
▲ 4 ▼ Down warp amount 40mm
▲ 5 ▼ Side opening 4mm
▲ 6 ▼ Circumferential misalignment 20mm
(Correction force setting value)
(1) Upper warp correction power 9.8kN
(2) Lower warp correction power 11.8kN
(3) Side opening correction force 11.8kN
[0025]
The results after correction were as follows.
▲ 1 ▼ Route gap amount 0mm
(2) Offset amount 0mm
(3) Tact time 21.5s
This is the time from the start of running of the correction device to the completion of the lateral opening correction. In the conventional manual operation, even an expert can take several minutes, and in the present invention, correction can be made in a much shorter time.
[0026]
【The invention's effect】
As described above, according to the present invention, it is possible to automatically correct the upper warping, lower warping, lateral opening, and offset of the tab plate of the welded pipe in a short time, and the effect of saving labor can be achieved. is there.
[Brief description of the drawings]
FIG. 1 is a schematic view of a tab plate automatic straightening device of the present invention.
FIG. 2 is a schematic diagram showing an arrangement relationship between an upper warp correction device, a lower warp correction device, a lateral opening correction device, and an angle adjustment device thereof.
FIG. 3 is a front view of the correction apparatus main body.
4 is a side view of FIG. 3. FIG.
5 is a front view showing the tilting device in FIG. 3 with the tilting device omitted.
6 is a side view of FIG. 5. FIG.
FIG. 7 is an explanatory view showing a tab plate following action of the tilting device.
FIG. 8 is an explanatory diagram showing the state of the tab plate warping, warping, lateral opening, and offset.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Original pipe 2 Tab board 3 Original pipe groove 4 Tab board groove 10 Straightening device main body 11 Base 12 Upper warpage correction device 13 Lower warpage correction device 14 Side opening correction device 15 Tilt device 16 Angle adjustment device 17 Proximity switch 21 Lifting body 30 tilting frame 37 scissors member

Claims (3)

A warp correction means for correcting the warpage of the tab plate,
A downward warping correction means for correcting the downward warping of the tab plate,
A straightening device comprising a pair of right and left lateral straightening means for straightening the lateral spread of the tab plate, the straightening device being mounted on the gantry so as to be movable and liftable in the direction of the tube axis, Tilting means for causing the entire correction device to follow the deviation of the tab plate in the circumferential direction;
Angle adjustment means for changing the correction angle of the lateral opening correction means according to the outer diameter data of the original pipe,
An apparatus for automatically correcting the tab plate of a welded pipe. A tilting frame is pivotally attached to an elevating body provided on the gantry, and the upward warping correction means, downward warping correction means, lateral opening correction means, tilting means and angle adjustment means are provided on the tilting frame. 2. The automatic tab plate straightening device for welded pipes according to claim 1. 3. The tab corrector for a welded pipe tab according to claim 1, wherein the tilting means has a scissors member that can be opened and closed to sandwich the tab plate from both sides.

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