JP2005066639A - Welding device for steel segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding device, in which welding is conducted along the edge of a steel segment while holding a welding machine in an optimum posture, even when the width or the radius curvature of the steel segment is varied or the segment is deformed due to thermal stress at welding. <P>SOLUTION: An arm is fixed to a shaft turned by a servomotor equipped with reduction gears, and a segment 30 is detachably attached to the circular-arc shaped attaching face of an attaching member fixed to an arm end. A welding torch 26 is arranged on the top part of a circular-arc track drawn by the both side edges of the segment revolving on the shaft as a center of curvature, and a copying roller 24 moving along the edge is integrally provided. When welding is conducted, the welding torch 26 is led by the copying roller 24 and moved along the edge by following the movement of the roller 24 along the edge. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a welding apparatus for a scale segment (hereinafter sometimes referred to as a workpiece W) for shield construction used in a water and sewage pipe buried underground, a underground buried pipe through which a communication cable and a power cable are passed, or a common groove. In particular, the present invention relates to a welding apparatus used for welding a main girder and a skin plate constituting a steel segment along an edge.

FIG. 1 shows an example of a steel segment. Both ends are connected by a joint plate 1 in an arch shape, and a pair of main girders 2 constituting a frame together with the joint plate 1 are separated from each other by an appropriate interval. It consists of vertical ribs 3 to be connected and a skin plate 4 having an arched cross section covering the outer peripheral surface of the frame. Each member is connected by welding, and among these, the main girder 2 and skin plate 4 are welded. The two welding machines are arranged on both sides of the skin plate 4 shown in FIG. 2, and each welding machine 6 is moved along the edge of the workpiece W in the direction illustrated by the arrow in the figure, so that the main girder upper end surface and the skin It was done by welding the plate side end face in a circular arc shape,
(1) Since the workpiece W has some variation in the width (interval direction between the welders 6) and the radius of curvature, and the workpiece W is bent and deformed by the thermal stress during welding, the product quality is unstable. That it was apt to be,
(2) Even if it is possible to cope with variations in the width and curvature radius of the workpiece W by measuring the width and curvature radius of the workpiece W and changing the control data of the welding robot according to the measured value, Measuring the width and radius of curvature is cumbersome, and every time the workpiece W changes, such measurements are taken, and changing the control data is cumbersome and time-consuming, and also supports the above-mentioned thermal stress during welding. Can not do,
(3) When welding along the arc is continuously performed from one end of the arc to the other end, climb welding is performed in one half of the arc and descend welding is performed in the other half, and climb welding is inevitable. If welding is to be performed only by descending welding, welding is started from the top of the arc and descending welding is performed, and when the end of the arc is reached, the welding torch is returned to the top of the arc and then welding is started again in the opposite direction. And it is necessary to weld to the other arc end, and the work efficiency is reduced over two steps,
There were problems such as.

  A first object of the present invention is to provide a welding apparatus capable of performing welding along the edge of the skin plate in an optimum posture at all times by fixing the welding machine and turning the workpiece W around the center of curvature. The second purpose is that even if there is some variation in the width and curvature radius of the workpiece W, and even if the workpiece W is deformed due to thermal stress during welding, the workpiece W It is an object of the present invention to provide a welding apparatus in which welding along the edge of the steel sheet is reliably performed and the quality of the product is not impaired.

  The invention according to claim 1 relates to a welding apparatus that achieves the first object, wherein a pair of main girders that form an arch shape and both ends are connected by a joint plate and constitute a frame together with the joint plate, and an outer periphery of the frame A turning device for turning a steel segment comprising a skin plate covering the surface and forming a part of the circumference by forming a cross-sectional arch around the center of curvature of the circumference, and an edge of the steel segment turned by the turning device And a welding machine having a welding torch arranged at the apex of the drawn arc locus.

  According to the present invention, fillet welding along the edges of the main girder upper end surface and the skin plate side end surface can always be performed at the apex of the arc locus.

  The swivel device used in the present invention includes, for example, a shaft that is rotationally driven using a motor or the like as a drive source, an arm that is fixed to the shaft and protrudes in the radial direction, and that rotates together with the shaft, and is fixed to the arm end. A mounting member having an arcuate mounting surface at the center and a steel segment detachably attached to the mounting surface; rollers arranged at regular intervals on the circumference; one of them And a steel roller on which the steel segment on the roller is moved on the circumference by the drive roller.

The invention according to claim 2 relates to the former swivel device. In the welding device according to claim 1, the swivel device is rotationally driven with a motor or the like as a drive source, and is fixed to the shaft in the radial direction. An arm that protrudes and pivots together with the shaft, and an attachment member that is fixed to the arm end and has an arc-shaped attachment surface with the shaft as the center of curvature, and the steel segment is detachably attached to the attachment surface. As a feature,
The invention according to claim 3 relates to the latter swiveling device. In the welding device according to claim 1, the swiveling device includes rollers arranged at appropriate intervals on the circumference, and the roller includes at least one of the rollers. One is a drive roller.
According to the invention, the steel segment moves by rolling the roller.

  The invention according to claim 4 relates to a welding apparatus that achieves the fourth object, wherein both ends are connected by a joint plate, a pair of main girders constituting a frame together with the joint plate, and a skin plate that covers the outer peripheral surface of the frame It consists of a pair of welding machines with welding torches arranged at intervals corresponding to the arc-shaped edges of the steel segments that form part of the circumference with a cross-sectional arm shape, In the welding apparatus in which either or both are moved in opposite directions on the circumference to fillet the edge of the main girder upper end surface of the edge and the edge of the skin plate side end surface, each welding machine is in a direction perpendicular to the edge. And a first roller that presses the scanning roller against the skin plate side end surface along the skin plate side end surface and rolls along the upper end surface of the main girder. And having means, the second spring means for pressing the copying roller main girder upper surface.

  According to the present invention, when the copying roller rolls along the edge, the welding machine can move up and down together with it or move laterally, and the welding torch can always be relatively moved along the edge.

  The invention according to claim 5 is the invention according to claims 1 to 3, wherein a pair of welding machines is arranged, and an interval between welding torches is arranged at an interval corresponding to an arc-shaped edge of the steam segment, and each welding machine is A scanning roller that can move up and down in the direction perpendicular to the edge and move laterally, rolls along the upper end surface of the main girder along the skin plate side end surface, and first presses the scanning roller against the skin plate side end surface And a second spring means for pressing the copying roller against the upper end surface of the main beam.

  According to the first aspect of the present invention, fillet welding along the edge of the skin plate can be continuously performed from end to end of the edge with the welding torch fixed at the optimum posture at the top of the arc locus. .

  In the invention according to claim 2, by turning the arm, the steel segment can be turned while drawing an arc locus. In the invention according to claim 3, the steel segment is a large-diameter steel segment having a long curvature radius. However, the swivel motion can be reliably performed, and the entire apparatus can be made compact.

  In the invention according to claim 4, even if there is a variation in the width of the skin plate or a variation in the radius of curvature of the main girder, the main girder and the skin plate are bent and deformed by the thermal stress during welding. Even if there is nothing, the welding torch always performs fillet welding along the edge by rolling along with the copying roller being pressed against the skin plate side end surface and the main girder upper end surface and moving along the edge. Can be done, the product quality is stable.

  In the invention which concerns on Claim 5, the effect of the invention which concerns on Claims 1-3 and the invention which concerns on Claim 4 can be show | played together.

  FIG. 3 shows a front view of the welding apparatus according to the present invention, and FIG. 4 shows a side view. A frame 12 standing on the base 11 is horizontally mounted with a shaft 13 at the bottom. The servomotor 14 with a speed reducer, which is a drive source such as a motor connected to one end of the shaft, is rotatably supported.

  A pair of arms 16 connected to the shaft 13 by a hollow rod 15 with a constant interval are fixed to the shaft 13. Each arm 16 has a balance weight 17 at the lower end and an attachment member 18 at the upper end. The upper surface of the attachment member 18 is an arcuate attachment surface with the shaft 13 as the center of curvature. The mounting member 18 is also provided with a mounting plate 19 projecting through the pin 21 through the bolt hole 5 formed in the main beam 2 of the steel segment placed on the mounting member 18 through the mounting plate 19. Can be attached detachably. A welding machine 23 is also attached to the frame 12 at a certain interval in the upper part.

  As shown in FIG. 5, each welding machine 23 includes a copying roller 24, a support device 25 that supports the copying roller 24 so as to urge downward and to the left in FIG. 5, and a welding torch 26. Hereinafter, these will be described in order.

  The copying roller 24 has a large-diameter portion 24a that rolls on the skin plate 4 and can roll on the upper end surface of the main girder 2 in contact with the end surface on the skin plate side at one end. A pair of brackets 28 projecting downward from the slide plate 27 are rotatably supported by pins 29.

  The support device 25 is connected to the air cylinder 31 attached to the frame 12, is connected to the piston rod 32 of the air cylinder 31, and is moved up and down by the pair of guide rods 49 and the upper plate 33. The head 34a is penetrated to the upper end, and when the piston rod 32 is raised, the upper plate 33 comes into contact with the head 34a and pulls the lower plate 35 together with the slide plate 27 and the copying roller 24 through the guide rod 34. A pair of guide rods 34 provided with a pair of guide rods 34 projecting upward, a bearing plate 30 into which guide rods 34 are fitted and fixed to upper plate 33, and lower plate 35. The second bar which is wound around the guide rod 34 between the two and acts to push down the lower plate 35. A coil spring 36 as means, a slide plate 27 that is slidably supported by the lower plate 35, and whose sliding direction is the axial direction of the copying roller 24, and an air cylinder that is attached to the lower plate 35 via a mounting plate 40. 37, a pin 29 that pivotally supports the copying roller 24 and protrudes from the bracket 28 is fitted into the end of the piston rod 38 of the air cylinder 37 so as to be slidable and rotatable, and is fixed to the piston rod 38. A coil spring 41 serving as a first spring means is wound around the pin 29 and the piston rod 38 between the bracket 28 and the bracket 28, and the periphery of the pin 29 and the piston rod 38 is covered with a cylinder 42 fixed to the bracket 28. A stopper 43 that engages with the flange 39 when the piston rod 38 is retracted is attached to the open end.

  The slide plate 27 has a sensor for detecting the end of the steel segment. When the sensor detects the end of the steel segment, a detection signal is sent to a controller (not shown), and the controller thereby drives the servo motor 14. While stopping, it outputs to the switching valve of the air cylinder 31, and the piston rod 32 of the air cylinder 31 protrudes to the stroke limit. The air cylinders 31 and 37 described above are both air cylinders with a positioner. When the piston rod 32 of the air cylinder 31 reaches the stroke limit, the controller switches the switching valve of the air cylinder 37 to project the piston rod 38 to the stroke limit. When the piston rod 38 reaches the stroke limit, the controller activates the servo motor 14 to restart the turning of the arm 16 and outputs to the power source of the welding torch 26 to start welding. The servo motor 14 is controlled so as to be performed at a speed suitable for fillet welding.

  When the sensor detects the end of the steel segment again, the controller outputs to the switching valves of the air cylinders 31 and 37 to retract the piston rods 32 and 38 and raises the copying roller 24 and retracts to the side. Then, after a certain time has elapsed, the power supply of the welding torch 26 is turned off.

  The welding torch 26 has a pin 45 projecting sideways, and is gripped by a clamp 47 that is mounted on a support column 46 projecting upward from the slide plate 27 so that its mounting position can be adjusted in the vertical direction. By rotating the pin 45 as a fulcrum, the orientation of the welding torch 26 can be adjusted.

  This apparatus is configured as described above, and when welding the edge forming the arch shape of the steel segment, the steel segment is placed on the mounting surface of the mounting member 18 at the position shown by the solid line in FIG. The steel segment is connected to the mounting member 18 by passing through the bolt hole 5 of the main beam 2 and fixed.

  Next, the drive of the servo motor 14 is temporarily stopped. At the same time, the switching valve of the air cylinder 31 is switched, and the piston rod 32 protrudes. While the piston rod 32 protrudes to the limit, the copying roller 24 reaches the skin plate of the steel segment. However, when the piston rod 32 is lowered, the upper plate 33 is in a stopped state while compressing the coil spring 36. To approach. After the piston rod 32 is lowered to the lower limit, the copying roller 24 presses the skin plate 4 by the action of the coil spring 36, and subsequent changes in the level of the skin plate 4 are absorbed by the expansion and contraction of the coil spring 36. That is, the guide rod 34 moves up and down while sliding the upper plate 33 according to the level of the skin plate 4.

  When the piston rod 32 reaches the lower limit, the controller switches the switching valve of the air cylinder 37, whereby the piston rod 38 protrudes and moves the copying roller 24 on the skin plate to the left in FIG. When the large diameter portion 24a of the copying roller 24 hits the skin plate side end surface and the piston rod 38 still protrudes, the flange 39 of the piston rod 38 compresses the coil spring 41. After the piston rod 38 reaches the left limit, the large diameter portion 24a of the copying roller 24 presses the skin blade side end surface by the action of the coil spring 41, and the subsequent change in the width of the skin plate 4 is absorbed by the expansion and contraction of the coil spring 41. Is done. As described above, the copying roller 24 is positioned at the edge of the steel segment, and this positioning is performed at the left and right edges of the steel segment.

  When the piston rod 38 reaches the left limit, the controller restarts the servo motor 14 and turns on the welding torch 26. As a result, the arm 16 starts turning at an optimum speed for fillet welding, and welding by the welding torch is started along the edge. Thereafter, fillet welding to the edge of the steel segment is performed along the edge, and at the time of welding, the copying roller 24 leads while rolling the edge of the steel segment, and according to the lateral and vertical displacement of the edge. When displaced, the welding torch 26 integrated with the copying roller 24 is similarly displaced laterally and vertically, and fillet welding is performed along the edges.

  When welding is performed to near the end of the edge of the steel segment and the sensor detects the end of the steel segment, the controller outputs to the switching valves of the air cylinders 31 and 37 to retract the piston rods 32 and 38, and the copying roller 24 Is raised and retracted sideways. Then, after a certain time has elapsed, the power supply of the welding torch is turned off. Until the power is turned off, fillet welding is continued on the remaining edges up to the end of the steel segment without leading by the copying roller 24.

  In the above embodiment, the copying roller 24 is arranged in front of the welding torch 26 to lead welding, but it may be arranged behind the welding torch and attached after welding. .

The perspective view of the back side of a steel segment. The perspective view of the front side of a steel segment. The front view of the welding apparatus which concerns on this invention. The same side view. The side view of a welding machine.

Explanation of symbols

1 .. Joint plate 2. Main girder 3 Vertical rib 4 Skin plate 5 Bolt hole 12 Frame 13 Shaft 14 Servo motor 16 with reduction gear Arm 17 Balance weight 18 .. Mounting member 19 .. Mounting plates 21, 29, 45... Pin 23... Welding machine 24... Copying roller 25.. Support device 26. 37 ·· Air cylinder 32, 38 · · Piston rod 33 · · Upper plate 34, 49 · · Guide rod 35 · · Lower plate 36, 41 · · Coil spring 39 · · · 42 · · cylinder 43 · · stopper 46 ·・ Support 47 ・ ・ Clamp

Claims (5)

  It consists of a pair of main girders that form a frame together with the joint plate, and a skin plate that covers the outer peripheral surface of the frame, and forms a part of the circumference by forming a cross-sectional arch. A turning device for turning the steel segment around the center of curvature of the circumference, and a welding machine having a welding torch arranged at the apex of an arc locus drawn by the edge of the steel segment turned by the turning device. Features steel segment welding equipment.   A shaft that is rotationally driven using the motor or the like as a drive source, an arm that is fixed to the shaft and protrudes in the radial direction, and that rotates together with the shaft, and an arc-like shape that is fixed to the arm end and has the shaft as the center of curvature. 2. The steel segment welding apparatus according to claim 1, further comprising a mounting member having a mounting surface to which the steel segment is detachably attached.   2. The steel segment welding apparatus according to claim 1, wherein the swivel device comprises rollers arranged on the circumference at appropriate intervals, at least one of which is a drive roller.   A steel segment circle, which is composed of a pair of main girders that form a frame together with the joint plate, and a skin plate that covers the outer peripheral surface of the frame and forms a part of the circumference with a cross-sectional arm shape. It consists of a pair of welding machines with welding torches arranged at intervals corresponding to the arc-shaped edges, and either or both of the steel segments and the welding machines are moved in opposite directions on the circumference so that the main girder of the edges In the welding equipment that fillet welds the edges of the upper end surface and the skin plate side end surface, each of the above welding machines can be moved up and down in the direction perpendicular to the edge and moved laterally, along the skin plate side end surface, on the main girder A scanning roller that rolls on the end surface; first spring means that presses the scanning roller against the end surface on the skin plate side; and second spring means that presses the scanning roller against the upper end surface of the main girder. Welding device steel segments characterized by.   A pair of the above-mentioned welding machines, and the interval between the welding torches is arranged at an interval corresponding to the arc-shaped edge of the steam segment, and each welding machine can move up and down in the direction orthogonal to the edge and move laterally. , A copying roller that rolls along the upper surface of the main girder along the skin plate side end surface, first spring means that presses the copying roller against the skin plate side end surface, and a second that presses the copying roller against the upper surface of the main girder 4. The steel segment welding apparatus according to claim 1, further comprising a spring means.

Images