JPS5831273B2 - Automatic pipe welding equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic welding device for pipe bodies.

Conventional automatic pipe welding equipment has a guide rail that is fitted onto the outer surface of the pipe near the joint, and an automatic welding machine that runs along this guide rail. It was something to do.

However, with such conventional equipment, when large-diameter pipes (for example, 2,500 mm in diameter) are sequentially assembled and joined upward to form a column, the guide rail becomes large and heavy, making installation difficult and requiring construction materials. In addition, in the case of the deep foundation construction method, in which such columns are assembled in foundation holes dug deep into the soil, welding from the outside becomes a big problem in terms of cost because the diameter of the hole to be dug becomes large. was.

The present invention provides an automatic tube welding device that can solve this problem, and one embodiment thereof will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a large-diameter pipe to be welded onto the column 2 that has been sequentially joined and erected from below, and a backing plate welded to the outer peripheral surface of the upper end joint 3 of the column 2. The lower end joint 5 is fitted into the lower end joint 5, and the stopper 6 welded to the outer peripheral surface of the lower end joint 5 comes into contact with the backing plate 4, so that the root gap of the joint groove 7 is closed. It is secured.

The upper end surface 8 of this large diameter pipe 1 is finished into a flat surface, and this upper end surface is used as a travel guide surface for the automatic welding device 90.

That is, the rollers 11a and 11b move on the traveling guide surface 8.
A support frame 12 is suspended inside the pipe 1 from a traveling trolley 10 that travels by a vehicle, and an automatic welding machine 13 is attached to the tip of the support frame 12 so that the tip of the welding head faces the joining groove 7. There is.

i4a and 14b are a pair of guide rollers extending from the traveling carriage 10 so as to sandwich the wall of the pipe 1 from the inside and outside to prevent the traveling carriage 10 from falling; This is a posture-maintaining guide roller disposed so as to come into contact with the inner peripheral surface on the opposite side in the diametrical direction, and is connected to the traveling carriage 10 by a connecting rod 16 that can be expanded and contracted according to the pipe diameter.

The posture holding guide roller 15 prevents the automatic welding machine 13 from wobbling and accurately regulates the position of the welding head.

Incidentally, a plurality of posture-maintaining guide rollers 15 may be attached to the tip of the connecting rod 16.

Reference numeral 17 denotes a traveling drive motor on the traveling truck 10, and the traveling truck 10 is caused to travel by rotating either 11a or 11b by an appropriate transmission means 18.

By simultaneously controlling the traveling cart 10 and the automatic welding machine 13 using such an automatic welding device 9, it is possible to automatically weld the inner surface of the joint groove portion 7 using the upper end surface 8 of the large diameter pipe 1 as a traveling guide surface. It can be done.

As explained above, according to the automatic pipe welding device according to the present invention, pipes can be welded and joined from the inner side, so it is effective when there is a problem in welding from the outer side. For example, in the case of the deep foundation construction method, the excavation hole can be made smaller, which greatly contributes to reducing construction costs.

Moreover, since the upper end surface of the tube is used as the running guide surface, there is no need for a special guide rail and the installation work is also eliminated, making it extremely efficient.Furthermore, the upper end surface that becomes the running guide surface is originally beveled. Since the tube is made of a material, no special machining is required, and since the tube circumferential end surface is accurately machined to form a groove, a reliable joint can be obtained.

Furthermore, since the posture-maintaining guide roller is provided which contacts the inner circumferential surface of the tubular body on the opposite side in the diametrical direction to the guide roller, it is possible to prevent the automatic welding machine from wobbling and to accurately regulate the position of the welding head.

Furthermore, since this attitude-maintaining guide roller is attached to the traveling carriage via an extendable connecting rod, it can be used with pipe bodies of various pipe diameters.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal side view;
FIG. 2 is a view taken along the line A--A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Pipe (large diameter pipe), 2... Column body, 3... Upper end joint of column 2, 5... Lower end joint of pipe 1, 7...
Joint groove portion, 8... Upper end surface (traveling guide surface), 9...
Automatic welding device, 10... Traveling trolley, 11a, Ilb.
...Roller, 12...Support rod, 13...Automatic welding machine, 14a. 14b...Guide roller, 15...Posture maintaining guide roller, 16...Connection rod, 17...Travel drive motor.

Claims (1)

[Claims] 1. A plurality of rollers that abut the upper end surface of a tube whose lower end joint is welded to the upper end joint of the counterpart tube, a travel drive motor that drives the rollers, and a tube wall of the tube. A traveling truck is provided with a pair of guide rollers that sandwich the tube from both sides, and the traveling truck has a welding head inside the tube so that the tip of the welding head faces the joint between the tube and the other tube. The automatic welding machine located at the position is attached via a support rod, and a posture-maintaining guide roller that comes into contact with the inner circumferential surface of the pipe body diametrically opposite to the guide roller is attached via an extendable connecting rod. An automatic pipe welding device characterized by: