JP2008302367A - 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, by which machine and method even a narrow portion can be efficiently welded, and the change and shift of a welding position can be properly treated, and the welding quality can be stabilized, and further a joint fitting portion can be directly welded without using channel steel, etc for stopping water, and also can stabilize the welding quality by stabilizing the movement along a welding line by means of a relatively simple and compact device. <P>SOLUTION: A welding carriage 11 serving as a supporting body capable of moving in the vertical direction is inserted into a narrow space formed between steel sheet piles 1, 1' to be welded. The welding carriage 11 is configured so as to provide a welding head 13 having a welding torch 12 serving as welding mechanisms, wheels 14 serving as moving means on a welding position side, wheels 15 serving as moving means on the opposed side to the welding position side, and a hydraulic cylinder 16 serving as a pushing means. A welding torch 12 is brought to the welding position by pushing the welding carriage 11 against the steel sheet pile 1 to be welded by applying a reaction force to the steel sheet pile 1' arranged to be opposed to the welding side by means of the hydraulic cylinder 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

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. In such a method, only downward welding is possible.

  In addition, there is a method of inserting a guide rail into a narrow part and fixing it with a magnet, etc., and welding on the guide rail by running a welding head, but it is very difficult to set the welding line and the guide rail in parallel. Met. Further, 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 attracts the other steel welded material, and is made of steel. An apparatus is described in which welding is performed while ascending along the workpiece.

  In the invention described in Patent Document 1, the conditions that can be used are limited to the case where the arrangement of the members to be welded is vertical, and a narrow portion is left to be welded and the operator welds it. Further, 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.

  In view of such a problem, the present applicant can perform welding efficiently even in a narrow part, can easily cope with a change or deviation of the welding position, and can stabilize the welding quality and An automatic welding method has been filed (Patent Document 2).

JP-A-8-174221 JP 2005-329445 A

  The automatic welding machine described in Patent Document 2 is used for moving means of a welding machine as a material to be welded when the automatic welding machine is inserted into a closed region formed by a steel material having a joint and the gap of the joint fitting portion is closed. We use grooved steel for water stop that also has the role of a guide rail, and weld this grooved steel etc. to the joint steel using this grooved steel as a guide. It is desired to weld the joint fitting portion directly without using it.

  Further, in the automatic welding machine described in Patent Document 2, when the joint fitting portion is directly welded, on the roller side using a grooved steel for water stop as a guide, a spacer with a roller or the like at the tip, There is a problem that a magnet to be attracted to the joint fitting portion is provided and the apparatus becomes complicated.

  Furthermore, since the spacer with a roller or the like disposed on the opposite side of the welding position and its pressing means are rotatably connected via a hinge, they follow the deformation of the material to be welded. Since only one pressing means / spacer was provided in the weld line direction, it was difficult to stabilize the weld line.

  The present invention is intended to solve the above-described problems, and can perform welding efficiently even in a narrow part, can cope with a change or deviation of the welding position, and can perform welding quality in automatic welding. , Joint fittings can be welded directly without using water-resistant channel steel, etc., and relatively simple and compact equipment stabilizes the movement along the weld line and stabilizes the welding quality. It is an object of the present invention to provide an automatic welding machine and an automatic welding method capable of achieving the above.

  An automatic welding machine according to claim 1 of the present invention includes a support provided with a welding mechanism, moving means for moving the support along a weld line using a material to be welded as a guide, and the support at a welding position. In the automatic welding machine having a pressing means for pressing toward the welding body, a pair of moving means is arranged on the welding position side of the support body with a gap in the welding line direction with the welding line interposed therebetween, and the support body is located on the side opposite to the welding position. Further, the pressing means are arranged at intervals in the welding line direction, and a moving means is provided at the tip of each pressing means.

  The welding mechanism corresponds to a so-called welding head provided with a welding torch, a wire feeding device, and the like. Wheels, sliders, and the like can be used as the moving means. A pair of wheels and the like are arranged up and down across the welding line, and the inner surface of the workpiece is rolled by two sets in total, for example, four wheels. Is preferred. A hydraulic cylinder, a spring, a solenoid or the like can be used as a plurality of (two) pressing means arranged at intervals in the vertical direction. When a hydraulic cylinder is used, the wheel at the tip can be moved in and out of the inner surface of the workpiece by remote control, and the welding position can be controlled by controlling the pressure on the upper and lower (two) hydraulic cylinders. Can be adjusted.

  As a method for moving the support, for example, a method in which the support is suspended with a hoist or the like, a wire is sent out, and it is moved up and down by winding is used. In addition, what is raised / lowered by the drive mechanism provided in the support body may 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.

  What is important in automatic welding is to maintain a correct welding position and a precise welding target position. In the present invention, moving means such as wheels are arranged at intervals on the welding position side of the support body, and pressing means having moving means such as wheels on the tip are arranged at intervals on the opposite side on the opposite side. By pressing the wheel or the like against the inner surface of the material to be welded by the pressing means, reaction forces can be taken at a plurality of upper and lower locations, the movement of the support of the welding machine is stabilized, and the welding quality can be stabilized.

  An automatic welding machine according to a second aspect of the present invention is the automatic welding machine according to the first aspect, characterized in that the moving means is a wheel using a deformable elastic material.

  By using rubber wheels, etc. for the moving means on both sides of the support, it easily follows deformations such as unevenness and torsion of the material to be welded, coupled with the pressing by the pressing means, and more stable movement of the support, welding quality Can be more stabilized.

  The automatic welding machine according to claim 3 of the present invention is the automatic welding machine according to claim 1 or 2, wherein the support is provided with a welding torch of the welding mechanism so as to be movable forward and backward with respect to the welding position. It is characterized by that.

  By enabling the welding torch to move in the direction approaching the welding line and the direction moving away from the welding line, stable welding can be performed, and the welding quality can be further stabilized.

  According to a fourth aspect of the present invention, there is provided an automatic welding method in which the support body of the automatic welding machine according to any one of the first to third aspects is pressed toward a welding position by a pressing means, and the support body is welded. The moving means on the position side and the anti-welding position side are respectively pressed against the inner surface of the welded material on the welding position side and the inner surface on the anti-welding position side, and moved along the welding line. It is characterized by welding the welding materials.

  According to the automatic welding method of the present invention, the moving means such as wheels are arranged at intervals in the vertical direction on the welding position side of the support, and the pressing means having the moving means such as wheels on the opposite side is vertically moved on the opposite side. By disposing them at intervals and pressing the wheel or the like against the inner surface of the welded material by pressing means, reaction force can be taken at multiple locations above and below, the movement of the support of the welding machine is stable, and the welding quality is stable Can be realized.

(1) In the present invention, moving means such as wheels are arranged at intervals in the vertical direction on the welding position side of the support, and the pressing means with the moving means such as wheels on the opposite side are arranged at intervals on the opposite side. The joint fitting part can be used without using water-stopping channel steel or the like because the reaction force can be taken at a plurality of locations above and below by pressing the wheel or the like against the inner surface of the material to be welded by the pressing means. Can be welded directly, improving the workability of welding.

(2) A relatively simple and compact device stabilizes the movement along the weld line and stabilizes the welding quality.

(3) By using rubber wheels, etc. for the moving means on both sides of the support, it easily follows deformations such as irregularities and torsion of the material to be welded, and coupled with the pressing by the pressing means, the movement of the support is further stabilized. This makes it possible to further stabilize the welding quality.

(4) By enabling the welding torch to move toward and away from the welding line, stable welding is possible, and welding quality can be further stabilized.

  Hereinafter, the present invention will be described based on the illustrated embodiments. 1, 2, and 3 are a vertical cross-sectional view as viewed from the side, a vertical cross-sectional view as viewed from the front, and a horizontal cross-sectional view showing an embodiment of the automatic welding machine of the present invention. FIG. 4 is a horizontal sectional view showing an example of a workpiece to which the automatic welding of the present invention is applied.

  As shown in FIGS. 1 to 4, the automatic welding machine 10 of the present invention is inserted into a narrow space sandwiched between two rows of steel sheet pile walls to which steel sheet piles 1 are connected via a joint 1 a, Welding 2 is directly applied to the gap between the fitting portions.

  As shown in FIGS. 1 to 3, the automatic welding machine 10 of the present invention is a vertically movable movable support inserted into a narrow space sandwiched between steel sheet piles 1, 1 ′ as materials to be welded. A welding head 13 having a welding torch 12 as a welding mechanism, a wheel 14 as a moving means on the welding position side, a wheel 15 as a moving means on the anti-welding position side, and a pressing means as A hydraulic cylinder 16 is provided. By applying a reaction force to the steel sheet pile 1 ′ opposite to the side to be welded by the hydraulic cylinder 16, the welding cart 11 is pressed against the steel sheet pile 1 on the side to be welded so that the welding torch 12 comes to the welding position.

  On the welding position side of the welding carriage 11, a roller 17 is provided that rolls with a grooved steel for water stop (not shown) covering the joint fitting portion as a guide. The wheels 14 are arranged in a pair of left and right so as to sandwich the welding line, and are attached to the welding carriage so as to be positioned at the corners of the steel sheet piles. A total of four wheels 14 in two pairs at intervals in the weld line direction roll on the inner surface of the steel sheet pile 1 to guide the vertical movement of the welding carriage 11.

  The hydraulic cylinder 16 is arranged on the opposite side of the welding carriage 11 from the wheel 14 at a predetermined interval in the welding line direction, and a mounting jig 18 is connected to the tip of the piston rod. 15 is attached. The mounting jig 18 is movably supported by the guide rod 19, and the wheel 15 can be pressed against the inner surface of the steel sheet pile 1 ′ by operating the hydraulic cylinder 16. Like the wheels 14, the wheels 15 are arranged as a pair on the left and right sides, and a total of four wheels 15 in two sets with intervals in the welding line direction roll on the inner surface of the steel sheet pile 1 'to move the upper and lower sides of the welding cart 11 up and down. Guide the movement.

  By forming these wheels 14 and 15 from a deformable elastic material such as a rubber wheel, it is advantageous for positioning of the welding machine with respect to unevenness and twist of the steel sheet pile.

  The welding head 13 is provided at the lower end of the rod 20 depending from the lower part of the welding carriage 11. By providing the torch horizontal movement device 21 between the welding carriage 11 and the rod 20, the welding torch 12 is moved relative to the welding position. It is possible to adjust the welding position by horizontally moving in the forward and backward direction.

  The horizontal movement device 21 includes a drive motor 22, a screw rod 23 that is rotationally driven by the drive motor, and a nut member 24 that is screwed into the screw rod. The screw rod 23 is disposed along a direction that advances and retreats with respect to the welding position, and the nut member 24 that is guided and supported so as to be horizontally movable is horizontally moved by the rotation of the screw rod 23. The upper end of the rod 20 is attached to the nut member 23.

  A suspension part 30 is provided on the upper part of the welding carriage 11, and a wire (not shown) of a traction device such as a hoist is attached to the suspension part 30, and the steel sheet piles 1, 1 are fed by feeding and winding the wire. The automatic welding machine 10 moves up and down using the inner surface of 'as a guide.

It is the vertical sectional view seen from the side which shows one embodiment of the automatic welding machine of the present invention. It is the vertical sectional view seen from the front which shows one embodiment of the automatic welding machine of the present invention. It is a horizontal sectional view showing one embodiment of an automatic welding machine of the present invention. It is a horizontal sectional view which shows an example of the to-be-welded material to which the automatic welding of this invention is applied.

Explanation of symbols

1 ... Steel sheet pile (material to be welded)
2 ... Welding 10 ... Automatic welding machine 11 ... Welding cart (support)
12 ... Welding torch 13 ... Welding head 14 ... Wheel (moving means)
15 ... wheel (moving means)
16 ... Hydraulic cylinder (pressing means)
17 ... Roller 18 ... Mounting jig 19 ... Guide rod 20 ... Rod 21 ... Torch horizontal movement device 22 ... Drive motor 23 ... Screw rod 24 ... Nut member 30 ... Suspension member

Claims (4)

In an automatic welding machine comprising: 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. ,
A pair of moving means is arranged on the welding position side of the support body with the welding line interposed therebetween, and the pressing means is arranged on the anti-welding position side of the support structure with an interval in the welding line direction. An automatic welding machine characterized in that a moving means is provided at the tip of each pressing means.   2. The automatic welding machine according to claim 1, wherein the moving means is a wheel using a deformable elastic material.   3. The automatic welding machine according to claim 1, wherein a welding torch of a welding mechanism is provided on the support body so as to be movable forward and backward with respect to the welding position.   The support of the automatic welding machine according to any one of claims 1 to 3 is pressed toward a welding position by a pressing means, and the moving means on the welding position side and the anti-welding position side of the support are respectively covered. The welding material is pressed against the inner surface on the welding position side and the inner surface on the anti-welding position side, moved along the welding line, and welding is performed between the materials to be welded by a welding mechanism provided on the support. Welding method.

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