JPH0227984Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a trackless automatic welding device which is an improved linear automatic welding device and which enables tracing welding and compound curvature bend welding.

In general, fillet welding of a curved plate, such as the blade ring of a turpin compartment, is performed by assembling a welding device body 1, a four-wheel vehicle for traveling 2, a welding torch 3, and a curved plate, as shown in Figure 1. An automatic welding device consisting of a pair of guiding rollers 4 at the front and rear is used. However, in such a conventional automatic welding device, as shown in FIG.
The front wheel is moved by the bending radius R of the bending plate.
Moreover, the copying roller 4 is magnetized so that it rolls in close contact with the wall surface. Therefore, in one welding process, since the traveling angle θ of the front wheel is fixed, it is possible to trace only a constant curvature, and bend welding with a compound curvature is impossible. In addition, this automatic welding device is a ready-made product,
It had drawbacks such as being quite expensive and impractical.

The present invention was proposed in order to improve these conventional drawbacks, and it improves the existing automatic welding equipment to create a tricycle structure in which the front wheel of the welding equipment itself uses one free wheel such as a free caster. By that,
It is an object of the present invention to provide an automatic welding device that can perform copy welding without using a magnet for a copy roller, and also enables bend welding with complex curvature.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An automatic welding apparatus according to the present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 3 is a plan view showing an embodiment of an automatic welding device according to the present invention, in which a driven front wheel 12 that can change direction and rotate freely is installed in front of the welding machine main body 11, and on the left and right rear wheels. It has a tricycle structure with driving wheels 13 installed. Furthermore, a copying roller 15 is installed on the side of the welding device main body 11 with a stay 14 interposed therebetween, with a predetermined distance maintained in the front and rear. Further, a welding torch 16 is installed in the welding device main body 11, and the welding position is adjusted according to the curvature of the wall surface 17 of the curved plate.

In this automatic welding device, the two rear wheels 13 are driving wheels, and the single front wheel 12 is a free wheel, so that the front wheel 12 basically follows the direction of the rear wheel 13 while the device is running.

Now, if at time t=0, both the front wheels 12 and the rear wheels 13 are facing in the tangential direction of point A as shown in FIG. As shown in FIG. 5b, a drag force P is generated on the margin copying roller 15 due to interference with the wall surface 17.

Therefore, a moment acts around the center of gravity G of the welding machine main body 11, and the front copying roller 15 of the main body 11 comes into contact with the wall surface 17 as shown in FIG. 5c.
It rotates by an angle Δθ until the drag force P of the copying roller 15 at the rear disappears. In this state, the directions of the rear wheels 13 and the front wheels 12 differ by an angle △θ, but since the direction of the front wheels 12 follows the direction of the rear wheels 13 as described above, the front wheels 12 are Angle △θ
It turns to align the direction with the rear wheel 13.

By repeating the above actions, the device can move along the curve.

FIG. 4 is an explanatory diagram showing a welding state when the curved plate has a curved wall surface not only on the outside but also on the inside, and also fillet welding when the wall surface 17 of the curved plate is meandering. This device makes this possible. In addition, when the wall surface 17 is inwardly curved, the action of the front and rear copying rows 15 is simply reversed, and the same as described above is performed.

As described above in detail based on the embodiment shown in the drawings, the automatic welding device according to the present invention has the following features:
Since the main body of the welding device has a tricycle structure and the front wheel which can freely change direction moves while being displaced in the tangential direction of the wall surface of the curved plate, bending welding of compound curvature of the curved plate can be easily performed. In other words, the present invention has a simple structure in which the front wheel of the welding machine body is a single wheel that can change direction freely, and without using a magnet for the copying roller, the drag force received by the copying roller and the driving force of the welding machine body act. This allows the front wheels to face in the tangential direction of the curve, making it possible to freely weld complex curvatures.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a top view showing a conventional fillet welding machine for curved plates, FIG. 3 is a top view showing a trackless automatic welding device according to the present invention, and FIG.
The figure is a top view showing the state of welding a compound curvature section using the automatic welding device according to the present invention, and FIG. 5 is an explanatory diagram of the operation. In the drawing, 10 is the welding machine body, 11 is the front wheel, 12
14 is a running wheel, 14 is a copying roller, and 15 is a welding torch.

Claims (1)

[Scope of utility model registration request] One driven front wheel that can change direction is provided at the front of the device body, and running wheels for driving are provided on both left and right sides of the rear of the device body to create a tricycle structure. A trackless automatic tracing welding device characterized in that a tracing roller is provided, and the drag force exerted by the tracing roller and the driving force of the device main body act to direct the driven front wheel in the tangential direction of the curve.