JP2005329445A - Automatic welding machine and automatic welding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic welding machine and an automatic welding method capable of efficiently performing welding even at a narrow part, easily coping with a change or a deviation of the welding position, and realizing the consistent welding quality. <P>SOLUTION: The automatic welding machine 3 is inserted in a narrow space surrounded by steel sheet piles 1, 1', and the supporting body 4 of the automatic welding machine 3 is vertically moved with a channel steel 2 being a work to be welded as a guide. A welding head 5, a spacer 7 or the like are provided to the supporting body 4, reaction force is taken by the steel sheet pile 1' on the opposite side by the spacer 7, and the supporting body 4 engaged with the channel 2 is pressed so that the flange tip of the channel steel 2 reaches the welding position 9 to perform the automatic upward welding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automatic welding machine and an automatic welding method for welding a steel material to a welding object such as a steel structure, and is particularly suitable for automatic welding in a narrow space.

  Conventionally, welding of a narrow portion such as in a steel pipe has been performed by attaching a welding torch to the tip of a long cantilevered arm and moving the arm. The welding target position was corrected by an operator observing the welding torch position with a CCD camera or the like. With such a method, only downward welding is possible.

  There is also a method in which a guide rail is inserted into a narrow part and fixed with a magnet, etc., and a welding head runs on the guide rail and welds, but it is very difficult to set the welding line and the guide rail in parallel. Met. In addition, when the weld line is long or when the welding posture is other than downward, it has been considered difficult to put to practical use.

In addition, in Patent Document 1, as a vertical automatic welding device that can be welded without attaching a rail for a welding carriage to a material to be welded, a steel material to be welded that is vertically coupled like a cruciform joint portion. A guide wheel that rolls on one surface of the steel, a traveling wheel that rolls on the surface of the other steel welded material, and a magnet that is attracted to the other steel welded material side. An apparatus is described in which welding is performed while ascending along the workpiece.
Japanese Patent Laid-Open No. 08-174221 Japanese Patent Laid-Open No. 06-142929 JP 08-267240 A JP 09-010931 A

  In the case of the invention described in Patent Document 1 described above, the conditions that can be used are limited to the case where the members to be welded are vertically arranged, and a narrow portion is left as a weld and the operator welds it. In addition, when the welding profile is off, welding must be stopped, and there is a problem that the welding line cannot be used unless it is almost completely straight.

  The present invention is intended to solve these problems in the prior art, can perform welding efficiently even in narrow spaces, can easily cope with changes and deviations in the welding position, and stabilizes welding quality. It is an object to provide an automatic welding machine and an automatic welding method capable of performing the above.

  An automatic welding machine according to claim 1 of the present application includes a support body having a welding mechanism, a moving means for moving the support body along a weld line using a material to be welded as a guide, and directing the support body to a welding position. And pressing means for pressing.

  The welding mechanism here corresponds to a so-called welding head equipped with a welding torch, a wire feeding device, etc., and the welding target position with respect to the welding line is stabilized by using the material to be welded as a guide. , Can stabilize the welding quality.

  Regarding the relationship between the support and the material to be welded, depending on the cross-sectional shape of the material to be welded, the form in which the material to be welded is sandwiched from both sides, the form in which a part of the support and the material to be welded fit, etc. Although there may be various modes, if necessary, a roller is provided at a contact position between the support and the material to be welded so that the support can move smoothly.

  As a method of moving the support, for example, a method of hanging the support with a hoist or the like, sending and lifting the wire, and raising and lowering by winding, etc. can be used. . Further, as long as the support can be moved stably, the moving direction of the support, that is, the direction of the weld line, does not necessarily have to be the vertical direction.

  The important thing in automatic welding is to keep the welding target position accurately under the correct welding conditions. However, in the present invention, the support body moves with the workpiece to be welded as a guide, so the relationship between the support body and the welding target position is It is always stable, and an accurate welding target position can be ensured by performing welding by pressing the workpiece to be welded to a predetermined position of the welding object together with the support by the pressing means.

  For example, if a steel sheet pile is placed in the soil and then the joint itself is welded or if a steel material for water stop is welded to the joint, the number of man-hours can be reduced if stable automatic welding is possible. However, depending on the steel sheet pile placement, the steel sheet pile joint after placement is not always linear like a normal weld. According to the present invention, even when the error is larger than that in the normal welding environment, the error can be absorbed and stable automatic welding can be performed.

  The welding position can be confirmed by a CCD camera or the like attached to the support as necessary.

  A second aspect of the invention relates to the automatic welding machine according to the first aspect, wherein when the support is pressed toward the welding position, one of the workpieces is pressed against the other workpiece. It is a thing.

  That is, the support member and one of the workpieces are pressed simultaneously, and it is not necessary to temporarily fix the workpiece to be welded separately.

  Claim 3 limited to the automatic welding machine according to claim 1 or 2, wherein the pressing means is a spacer for taking a reaction force on the side opposite to the welding position in the moving space of the support. Is.

  The present invention is particularly suitable for moving an automatic welding machine so as to travel through a narrow space, for example, when performing welding in a narrow space such as in a closed space sandwiched between two rows of steel sheet piles, A reaction force can be applied by pressing the tip of the spacer against a wall surface or the like opposite to the welding position in the moving space of the support, and the support and the workpiece can be pressed to a predetermined welding position.

  Although the form of the spacer is not particularly limited, for example, a spacer provided with an expansion / contraction mechanism such as a spring or a hydraulic cylinder is preferable, and a spacer provided with a roller so that the support can move smoothly at the tip can also be used.

  Moreover, when the movement space of a support body has bending parts, such as a corner part, a support body can be pressed and supported more stably by making the front-end | tip part of a spacer enter into a bending part.

In addition, the movement space of the support in claim 3 is not necessarily a closed space, and may be a space where a part is opened as long as there is a portion where reaction force can be taken.

  According to a fourth aspect of the present invention, in the automatic welding machine according to the first, second, or third aspect, the case where the support and the pressing means are rotatably connected via a hinge.

  As described above, when the to-be-welded object placed in the soil is twisted, when the support space is twisted, the support and the spacer are pivotally connected. Therefore, it is possible to easily cope with the welding object and torsion of the moving space.

  In particular, when a spacer having an expansion / contraction function is used, errors in all directions due to placement can be absorbed by the expansion / contraction function and rotation at the hinge portion.

  According to a fifth aspect of the present invention, there is provided the automatic welding machine according to any one of the first to fourth aspects, wherein the pressing means pressurizing mechanism for pressing the pressing means in a direction different from the welding position is limited.

  Examples of the pressing unit pressurizing mechanism include a hydraulic mechanism and the like, and a mechanism that ejects fluid in a direction different from the welding position.

  More specifically, for example, an air compressor or the like that jets air is provided in a direction almost opposite to the side to be welded, and the spacer pushes the spacer in the direction opposite to the welding position, and the reaction force causes the support and the workpiece to be welded. Examples include pressing the material to the welding position, and it is effective for adjustment when a non-functioning portion of the spacer occurs in the moving space of the support.

  A sixth aspect limits the automatic welding machine according to any one of the first to fifth aspects, wherein a magnet is provided on the workpiece side of the support.

  When stability is not sufficient, such as when the support is simply sandwiched from both sides of the workpiece to be guided, it is brought into close contact with the magnet by using an attractive force to stabilize the positional relationship. Furthermore, it is possible to secure a stable welding target position.

  The automatic welding method of the present invention uses at least one of welded materials to be welded to each other as a guide while pressing the support of the automatic welder according to any one of claims 1 to 6 toward a welding position by a pressing means. It moves along a welding line and welds materials to be welded by a welding mechanism provided on the support.

  In the present invention, since the welded material is pressed together with the support using the welded material as a guide, it is possible to save troubles such as installation of a guide rail, and the target position of the welding head with respect to the weld line is stabilized, thereby ensuring stable welding quality. be able to.

  According to the automatic welding machine and the automatic welding method of the present invention, the aiming position of the welding head with respect to the welding line is stabilized by using the welded material as a guide and further providing means for pressing the welded material together with the support. As a result, stable welding quality can be ensured.

  Also, conventionally, when welding by inserting a guide rail for traveling the welding head, it is necessary to set the welding line and the guide rail in parallel, and it has been difficult to apply in a narrow part, In the present invention, such a problem is solved, and the effect is particularly great in welding in a narrow portion.

  FIG. 1 shows a joint portion 1a between steel sheet piles 1 by means of an automatic welding machine 3 of the present invention in a narrow space sandwiched between two rows of steel sheet pile walls formed by connecting steel sheet piles 1 through a joint 1a. One embodiment in the case of welding the grooved steel 2 for water stop is shown.

  In the present embodiment, the automatic welding machine 3 includes a welding head 5 having a welding torch 5a as a welding mechanism on a support 4 that can slide in the vertical direction using a grooved steel 2 as a welding material as a guide. The spacer 7 which can be expanded and contracted in the horizontal direction according to the movement space of the automatic welding machine 3 is provided. By applying a reaction force to the steel sheet pile 1 ′ opposite to the side to be welded by the spacer 7, the flange 4 of the grooved steel 2 is placed at the welding position 9 on the support 4 abutted on the grooved steel 2. Can be pressed against.

  In this example, the support 4 is installed so as to sandwich the grooved steel 2 with respect to the grooved steel 2 serving as a guide, and a roller is provided so that sliding is smooth at the contact position with the grooved steel 2. 6 is attached.

  A suspension part 10 is provided on the upper part of the support 4. A wire (not shown) of a traction device such as a hoist is attached to the suspension part 10, and ascending and descending with the grooved steel 2 as a guide by feeding and winding the wire. It has a structure to do.

  By adopting a configuration in which the automatic welding device 3 including the welding head 5 inserted into the narrow portion is moved by a traction device placed outside the narrow portion, the device can be reduced in size and adapted to various welding postures. it can. In particular, in vertical upward welding, a traction device is disposed above the narrow portion, whereby the traction speed becomes the welding speed, and stable vertical welding is possible. Moreover, if an oscillator is attached to the welding head 5 as needed, more stable welding can be performed.

  Moreover, in this embodiment, the magnet 11 is attached to the support body 4, and it adsorbs | sucks to the channel steel 2 with the attractive force of the grade which does not inhibit the sliding with respect to the channel steel 2, and the support body 4 is channel steel. 2 so that it is not easily removed from 2.

  The spacer 7 holds the automatic welder 3 and the grooved steel 2 that is the material to be welded in a correct position in the narrow space when the automatic welder 3 of the present invention moves up and down, and also supports the support 4 as described above. It has the function of pressing the grooved steel 2 to the welding position 9 via In this example, a hydraulic cylinder 8 is incorporated between the support 4 and the spacer 7 so that it can expand and contract in the horizontal direction.

Further, in this example, the spacer 7 portion is connected to the support 4 so as to be rotatable in a horizontal plane via a hinge 7a, so that the narrow space due to twisting of the steel sheet piles 1 and 1 'placed therein is provided. This makes it easy to deal with distortions.

  If necessary, a roller 7b is attached to the tip of the spacer 7 and applied to a bent portion such as a corner in a narrow space, so that the automatic welding machine 3 can be moved and positioned smoothly.

  With respect to the welding target position in the automatic welding of the narrow portion, the situation during welding can be confirmed by mounting the CCD camera 12 or the like on the welding head 5.

  When the ground is soft and the steel sheet pile can be easily penetrated, the grooved steel 2 may be welded to one steel sheet pile 1. In addition, when the grooved steel 2 is attached after the two steel sheet piles 1 are connected, temporary welding is performed at an appropriate interval while moving the automatic welding machine 3 of the present invention from the top to the bottom, and the entire length is covered. After confirming that the environment can be welded, it is preferable to perform full length welding while pulling up the automatic welder 3 from below.

  FIG. 2 shows a joint portion 1a between steel sheet piles 1 by an automatic welding machine 3 of the present invention in a narrow space sandwiched between two rows of steel sheet pile walls formed by connecting steel sheet piles 1 through a joint 1a. One embodiment in the case of welding is shown. The basic configuration of the automatic welding machine 3 is the same as that of the embodiment of FIG. 1, and the description of common parts is omitted.

  In this example, a spacer 13 having a roller 13a at the tip is also provided on the joint portion 1a side to be welded, and the roller 13a is pressed so that the roller 13a is positioned at the bent portion of the steel sheet pile 1, and this bent portion is used as a guide. The automatic welding machine 3 can be smoothly moved and positioned.

  If this spacer 13 can be removed, a variety of spacers can be prepared, so that a suitable response can be made according to the shape of the space.

  Moreover, in this example, although the magnet 11 attached to the support body 4 is adsorb | sucking to the joint part 1a, the magnet 11 is replaced | exchanged according to the dimension etc. of the to-be-welded material which is a welding object, or the support body 4 is attached. On the other hand, the structure can be adjusted.

  FIG. 3 conceptually shows a basic configuration in the case of welding a reinforcing rib-shaped strip steel plate 22 in a narrow space formed by the welding object 21 as another embodiment of the present invention.

  The support 24 provided with the roller 26a is engaged so that the steel strip 22 is sandwiched from both sides, and the welding head 25 is pressed with one end of the steel strip 22 pressed against the welding position 29 by the spacer 27 provided with the hydraulic cylinder 27a. Welding is performed by a welding mechanism (not shown) such as a welding torch attached to the.

  A magnet 28 is incorporated in the support 24, and the other end of the strip steel plate 22 that is the material to be welded is attracted to maintain the engagement relationship, and the belt 24 is used as a guide to move in the longitudinal direction of the strip steel plate Automatic welding can be performed.

In a narrow space sandwiched between two rows of steel sheet pile walls, the automatic welding machine of the present invention shows an embodiment in the case of welding grooved steel for water stop to a joint portion between steel sheet piles. (A) is a side view of the automatic welding machine, (b) is a rear view, and (c) is a cross-sectional view taken along line AA of (a). In a narrow space sandwiched between two rows of steel sheet pile walls, an embodiment in the case of welding joints between steel sheet piles by the automatic welding machine of the present invention is shown, (a) is an automatic welding machine (B) is a rear view, (c) is a sectional view taken along the line BB of (a). It is the horizontal sectional view which showed notionally one embodiment in the case of welding a reinforcing rib-shaped strip steel plate in the narrow space formed with a welding object.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steel sheet pile (object to be welded), 2 ... Channel steel (material to be welded), 3 ... Automatic welding machine, 4 ... Support, 5 ... Welding head, 5a ... Welding torch, 6 ... Roller, 7 ... Spacer, 7a ... hinge, 7b ... roller, 8 ... hydraulic cylinder, 9 ... welding position, 10 ... suspension, 11 ... magnet, 12 ... CCD camera, 13 ... spacer, 13a ... roller, 14 ... welding position,
DESCRIPTION OF SYMBOLS 21 ... welding object, 22 ... strip steel plate, 23 ... automatic welding machine, 24 ... support body, 25 ... welding head, 26 ... engagement part, 26a ... roller, 27 ... spacer, 27a ... hydraulic cylinder, 28 ... magnet, 29 ... Welding position

Claims (7)

  A support body provided with a welding mechanism, a moving means for moving the support body along a welding line with a material to be welded as a guide, and a pressing means for pressing the support body toward a welding position. Automatic welding machine to do.   The automatic welding machine according to claim 1, wherein when the support is pressed toward the welding position, one of the welded materials is pressed against the other welded material.   The automatic welding machine according to claim 1 or 2, wherein the pressing means is a spacer for taking a reaction force on the side opposite to the welding position in the movement space of the support.   The automatic welding machine according to claim 1, 2, or 3, wherein the support body and the pressing means are rotatably connected via a hinge.   The automatic welding machine according to any one of claims 1 to 4, further comprising: a pressing unit pressing mechanism that presses the pressing unit in a direction different from the welding position.   The automatic welder according to any one of claims 1 to 5, wherein a magnet is provided on a side of the workpiece to be welded.   While pressing the support body of the automatic welding machine according to any one of claims 1 to 6 toward a welding position by a pressing means, the support member is moved along a weld line using at least one of the welded materials to be welded to each other as a guide, An automatic welding method comprising welding materials to be welded by a welding mechanism provided on the support.

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