JPS595499Y2 - Multi-electrode automatic welding equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multi-electrode automatic edge welding device for simultaneously welding a plurality of edge joints.

A rectangular sheet with a side of 1 m (several mm thick) as shown in Figure 1.
) When welding 22.23.24 to build a large thin structure such as an LNG underground tank, the periphery of the rectangular sheet is bent almost at right angles to reinforce the structure, and the height of the rectangular sheet is IQmm edge joints are formed on all four sides.

At both ends of this edge joint, when rectangular sheets are lined up vertically and horizontally, a gentle arc-shaped m-shaped disappearing part and a V-shaped n-type disappearing part appear alternately at each intersection part of the edge joint. It has been dropped into different shapes.

For this reason, even if the edge joints are parallel, their welded sections are different.

Furthermore, in the case of this structure, the rectangular sheets lie on the same horizontal plane when viewed from the direction of arrow B as shown in Figure 1, but when viewed from the direction of arrow A as shown in Figure 1C. In this case, the weld lines are not on the same horizontal plane, but are bent in the same vertical plane.

Conventionally, there has been no automatic welding equipment that can simultaneously weld such a structure, that is, a plurality of parallel edge joints in which the weld line is bent in the same vertical plane and the welding sections are different, and welding has been done manually.

However, manual processing results in decreased work efficiency and unstable quality, so automation has been desired.

The present invention has been developed in response to the above-mentioned demands, and is a parallel welding line in which the welding line is bent within the same vertical plane, the sections to be welded are discontinuous, and the lengths of the sections to be welded are different and different between adjacent welding lines. The purpose of the present invention is to provide a multi-electrode automatic edge welding device that can simultaneously weld multiple edge joints, thereby stabilizing welding quality and significantly reducing welding man-hours.

The structure of the multi-electrode automatic edge welding device of the present invention that achieves this purpose includes a moving guide rail on which a welding head moving carriage that moves in the welding direction is mounted on a moving carriage that can move horizontally in a direction perpendicular to the welding line. A plurality of welding heads are attached with a template bent parallel to the welding line, and the welding torch is positioned directly above the welding line using the edge joint itself as a guide, and the welding heads travel so as to move up and down following the template. is installed on the trolley, and the moving guide rail is provided with a dock indicating the start and end of each welding section of different length, while in contact with the dock,
The present invention is characterized in that the welding head traveling carriage is equipped with an arc control device that instructs adjacent welding torches when to ignite and extinguish different welding arcs.

The configuration of the present invention will be described in detail below based on an embodiment shown in the drawings.

Incidentally, this embodiment contemplates simultaneous welding of three seams.

As shown in FIG. 2, the traveling truck 1 for moving the entire welding device to the position of the helical joint to be welded has a pedestal 17
It is composed of four wheel parts 2 that run on rails 18, connecting rods 5 and 6 that interconnect them, and moving guide rails 3 and 4, and has a rod-like shape.

The moving guide rails 3 and 4 of this traveling carriage 1 are provided with a welding head traveling carriage 9 that supports the welding heads 11, 12, and 13.
a, 9b are mounted, and these are connected by a long arm 7 and a pipe 8.

In addition, in order to run both carts 9 a and 9 b stably with one motor, the pipe 8 is equipped with a chair 10 and a central control board so that a worker can ride on one of the welded carts. A transmission shaft for extracting other driving force from the drive motor of the head traveling carriage 9a is passed through.

Further, the long arm 7 is connected to the circumferential welding head traveling carriage 9.
Even though we connect the welding heads a and 9b, they are fixed to a contact 26 that is supported by the circumferential welding head carriages 9a and 9b so that they can move up and down via a slide 27, and the welding head is connected parallel to the welding line. A contact 26 pressed against the bending template 25 by a compression spring 28 follows the bending template 25 so as to maintain a constant distance from the weld line at all times.

Therefore, the welding torches 34 of the three welding heads 11, 12, 13 attached to the long arm 7 are
It is possible to follow a weld line as shown in Figure a, that is, a weld line that bends in the same vertical plane.

Each of the welding heads 11, 12.13 has a lip joint 23.
A copying roller 32 is provided which positions the welding torch 34 directly above the welding line using a and 23b as a guide.

Moreover, bullet-shaped guide plates 35 are attached to the mounting plates 33 of the copying rollers 32, respectively, for guiding the next edge joints 22 a and 22 b so that the copying rollers 32 can sandwich them smoothly.

In addition, in order to obtain a proper arc, slides 29, 30, 31 with servo motors for adjusting the height position and lateral position and a lens for monitoring the welding arc (not shown) are incorporated.
It is designed to detect voltage changes and limit welding arcs.

Each welding head 11, 12, 13 is connected to a cable 16 movably suspended by a guide rail 15 installed between fixed frames 19 at both ends and a guide rail 14 installed on the traveling truck 1. Shielding gas, welding current, cooling water, etc. are supplied.

In addition, the code|symbol 21 is a power supply.

The pedestal 17 on which a large number of rectangular sheets 22, 23, 24, which are materials to be welded, are arranged in a predetermined structure shape and placed thereon is movable.

As shown in FIG. 1, the rectangular sheets 22, 23, 24 are placed on rails 37 so that they can be moved in the welding direction.

Further, a fixed pedestal 19 is provided adjacent to this pedestal 17.

This gantry 19 is a reception in which a newly dissolved structure is placed when the welded structure is placed in the welding direction to the next step or the removal process with the structure welded after the welding is placed. This is for retracting the traveling carriage 1 when reaching the platform 17, and has a rail 20 that matches the rail 18 of the pedestal 17.

Further, a dock 36 is attached to the moving guide rail 3 or 4 to indicate the start and end points of the welding section, that is, the existence of the disappearing part of the edge joint.

As shown in FIG. 5, in the dock 36, the narrower spacing on the left side represents an n-type annihilation part, and the wider spacing on the right side represents an m-type annihilation part.

On the other hand, an arc control device that contacts the dock 36 to ignite and extinguish the welding arc is incorporated in the welding head traveling carriage.

This arc control device is electrically switched when a series of welding is completed.

In other words, as shown in Figure 6, in the area of ■, ■ and ■ are m
If the type vanishing part, ■, is the n-type vanishing part, in the region II, ■
and ■ are n-type annihilation parts, and ■ are m-type annihilation parts.

Therefore, by switching the correspondence between the dock and the arc control device, the same dock 36 can be used.

However, in some cases, such as when welding two or four edge joints at the same time, it is not necessary to switch the correspondence relationship.

In this manner, according to the multi-electrode automatic edge welding device of the present invention, the welding head is positioned directly above the welding line using the edge joint itself as a guide, and the welding head is moved up and down along the welding line bent within the same vertical plane using the template. At the same time, the welding arc is extinguished separately for different edge joints at the docks that indicate the start and end points of the welding section, so welding lines are bent in the same vertical plane and welding sections are different from each other. Multiple edge joints can be automatically welded simultaneously.

Therefore, we can expect a significant reduction in man-hours due to simultaneous welding of multiple seams, stable quality and increase in welding speed due to automation, and shortening of construction time.

[Brief explanation of the drawing]

Figure 1 shows an example of a thin plate structure constructed by connecting rectangular sheets with edge joints, where a is a perspective view and b is a perspective view of the structure.
A view in the direction of arrow A. C is a view in the direction of arrow A. Fig. 2 is a perspective view schematically showing the multi-electrode automatic edge welding device of the present invention, Fig. 3 shows the height adjustment mechanism of the welding torch, where a is a front view, b is a right side view, and Fig. The figure shows welding 1
5 and 6 are explanatory diagrams showing the positional relationship of the docks for welding arc generation and extinguishment. In the drawing, 1 is a running trolley, 3 and 4 are moving guide rails,
7 is a long arm, 9a, 9b are welding head traveling carts, 11, 12.13 are welding heads, 17 is a pedestal, 18
is the rail, 19 is the frame, 20 is the rail, 22.23, 2
4 is a square sheet, 25 is a template, 26 is a contact,
32 is a copying roller, 34 is a welding torch, 35 is a guide plate, and 36 is a dock.

Claims (1)

[Scope of utility model registration request] In an apparatus for simultaneously welding a plurality of parallel edge joints in which the welding line is bent in the same vertical plane, the sections to be welded are discontinuous, and the lengths of the sections to be welded are different from each other between adjacent welding lines. , Attach a moving guide rail carrying a welding-rad traveling truck that moves in the welding direction to a traveling truck that can move horizontally in a direction orthogonal to the welding line, and a template that bends parallel to the welding line, and A plurality of welding heads, in which the welding torch is positioned directly above the welding line using the joint itself as a guide, are installed on the welding head traveling carriage so as to move up and down following the template, and furthermore, a plurality of welding heads of a length are installed on the moving guide rail. A dock is provided to indicate the start and end ends of different welding sections, and the welding head traveling trolley is provided with an arc control device that instructs adjacent welding torches to ignite and extinguish different welding arcs in contact with the docks. A multi-electrode automatic edge welding device characterized by: