JPH0457433B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for efficiently circumferentially welding abutted portions of pipe materials whose joint end surfaces are abutted against each other.

<Prior Art> When a plurality of pipes are joined together to make them longer, the joined end surfaces of the pipes to be connected are abutted against each other, and the abutted portions are joined circumferentially.

As an automatic welding device for such pipe circumference welding, one having an appearance as shown in FIG. 4 is known. That is, a set screw member 15 having a presser block 14 at the tip is screwed into one of a pair of support rings 13 which are connected in an annular manner so as to surround the pipe member 12 via a connecting fitting 11. By screwing in the support rings 15, the pair of connected support rings 13 can be fixed at any position on the tube 12. A pair of rotating tubes 16 each having a semi-cylindrical shape are rotatably engaged with the upper ends of these support rings 13 so as to be concentric with the tube material 12,
The rotary cylinders 16 are designed to function as one cylinder, and a drive motor 1 attached to the other support ring 13 is attached to the outer periphery of the rotating cylinders 16 located inside the support ring 13.
A worm wheel 18 that meshes with a worm 7 (not shown) is carved. An arc length control device (hereinafter referred to as AVC) 21 that supports the TIG welding torch 19 via a control arm 20 is fixed at the upper end of one of the pair of rotating tubes 16.
The attitude of the TIG welding torch 19 can be finely adjusted by operating an adjustment handle 23 of a torch fine adjustment device 22 attached to the tip of a control arm 20. A filler wire tip 2 is connected to this TIG welding torch 19 via a bracket 24.
5 is held, and the filler wire 29 is fed from the filler wire reel 28 via the conduit cable hose 27 to this filler wire chip 25 by the operation of the filler wire feeding device 26 installed on the other support ring 13. will be sent. Note that a cab tire hose 30 for power supply and a gas hose 31 for shielding gas supply are connected to the TIG welding torch 19, and a control cable hose 32 for power and signals is connected to the AVC 21. The hose 32 also serves as power and signal to the drive motor 17. or,
These hoses 27, 30-32 are connected to the other support ring 1
The cable pinch rollers 33 are held between a pair of cable pinch rollers 33 that are rotatably supported by the cable pinch rollers 33, and are extended or retracted in an aligned state as the rotating tube 16 rotates.

<Problems to be Solved by the Invention> The conventional tube circumference welding device shown in Figure 5 is heavy and may damage the TIG welding torch, etc. if special care is not taken when attaching or detaching it to the tube material. There was a lot of danger that I would do this. Moreover, the butt part of the pipe material
Because it is necessary to accurately oppose the TIG welding torch, the entire device is slid along the pipe material after operating the connecting fittings, positioned, and the set screw member is screwed in to fix the support ring to the pipe material. Combined with the large overall weight, it takes a lot of time to set up the equipment, and especially in areas where there are many pipes, it takes time to position the equipment relative to the pipes, which significantly reduces work efficiency. bring about.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional pipe circumference welding apparatus, it is an object of the present invention to provide a welding apparatus capable of efficiently circumferentially welding butt portions of pipe materials.

<Means for Solving the Problems> The present invention provides a pipe circumference welding device which is connected in an annular manner so as to surround one of a pair of pipe materials whose joining end surfaces are abutted against each other, and which is connected in a ring so as to surround one of the pipe materials. a pair of positioning rings each having a semicircular arc shape that can be attached to and detached from the pair of positioning rings; and the pair of positioning rings that are attached to at least one of the pair of positioning rings and connected to each other are fixed to the one pipe member. a pair of support rings connected in an annular manner adjacent to the pair of positioning rings so as to surround the one pipe member; A tapered locking portion is formed and interlocked with each other, and the pair of positioning rings and the pair of support rings are interposed between the pair of positioning rings and the pair of support rings to expand the distance between them. a pair of pivot tubes each having a semicircular arc shape and capable of rotatably engaging the pair of tubes concentrically with the pair of support rings; and the pair of support rings. a swiveling tube driving means that is attached to one of the two swivel tubes and drives and rotates the pair of swivel tubes; and a welding torch that is attached to one of the two swivel tubes and faces the abutting portion of the pair of tubes. It is equipped with the following.

<Operation> First, a pair of positioning rings are opposed to each other with one of the pipe materials of a pair of pipe materials whose joint end surfaces are abutted against each other, and these positioning rings are connected to each other and fitted onto the pipe material by a fixing means. After the positioning ring is in place, the pair of support rings are opposed to each other with the tube located directly above the positioning ring interposed therebetween, and they are connected to each other. Then, the connection fixing means is operated to widen the gap between the positioning ring and the support ring, and the locking parts are pressed against each other to connect them together. At this time, the welding torch touches the protrusion of the pipe material. It is necessary to accurately set the vertical position of the positioning ring relative to the abutting part so that it accurately faces the abutting part.

Thereafter, the rotating tube is rotated around the tube by the rotating tube driving means, and the butt portions of the tube are butt-welded by a welding torch attached to the rotating tube. In addition, if there is a butt part of another pipe material to be welded separately, prepare one or more pairs of positioning rings, and fit the positioning rings to the other pipe material during this welding work. Immediately after this welding work is completed, the support ring is attached to the new pipe material, and circumferential welding of the pipe materials is performed one after another.

<Example> Fig. 1 shows the external appearance of an embodiment of the pipe circumference welding device according to the present invention, and Figs. 2 and 3 show its cross-sectional structure.
As shown in the figure, the device of this embodiment is a partially improved version of the conventional pipe circumference welding device shown in FIG. 5, and has almost the same structure, so only the different parts will be explained. The other parts are given the same reference numerals as those of the prior art, and the explanation thereof will be omitted.

One of the pair of positioning rings 35 connected annularly to surround the pipe 12 via the connecting fitting 34 is provided with a set screw member 36 that can fix the connected positioning rings 35 at the position of the pipe 12. By screwing in this set screw member 36 and pressing a presser block 37 attached to the tip against the outer peripheral surface of the tube 12, the positioning ring 35 is fixed to the tube 12 by the reaction force.
In this embodiment, the positioning ring 35 is fixed to the tube 12 using the set screw member 36 and the holding block 37, but it is also possible to tighten the pair of positioning rings 35 to the tube 12 using only the connecting fitting 34. It is also possible to perform the movement and fix the position.

A pair of support rings 13 connected in an annular manner surrounding the tube member 12 via the connecting fittings 11 are connected while being fitted into the upper end portion of the positioning ring 35.
A tapered locking portion 38 is formed on the inner circumferential surface of these support rings 13 and the diameter becomes smaller toward the positioning ring 35 side. A locking portion 39 having the shape of a shape is formed on the outer circumferential surface of the positioning ring 35 . Note that the relationship between these locking portions 38 and 39 may be reversed, and it is also possible to form them only on a part of the circumference. The positioning ring 35 is threaded with semi-cylindrical threaded cylinders 40 that perform one function when combined with each other, and the outer peripheral surface of one of the threaded cylinders 40 is provided with these screws. An operating lever 40 for rotating the cylinder 40 is provided in a protruding manner. By operating this operating lever 41, the screwing amount of the threaded cylinder 40 changes,
The distance between the positioning ring 35 and the support ring 13 can be adjusted.

Therefore, first, the pair of positioning rings 35 are fitted and fixed onto one of the tubes 12, but as a matter of course, when the support ring 13 is integrally connected to these positioning rings 35, the TIG welding torch 19 will touch the butt portion of the tubes 12. It is desirable to set the position of the positioning ring 35 with respect to the tube material 12 using a jig such as a gauge so that it accurately faces the positioning ring 42. Next, the support ring 13
The locking portion 38 of the positioning ring 35 and the locking portion 39 of the positioning ring 35 are connected so that they are engaged with each other (see FIG. 2),
Operate the operation lever 41 to let out the threaded cylinder 40 from the positioning ring 35, and the positioning ring 35 and the support ring 1
3, and are fixed integrally by the wedge action of the locking portions 38 and 39 (see FIG. 3). Thereafter, the drive motor 17 is rotated in the normal direction to drive the rotating tube 16 to rotate one or more rotations, and the hoses 27, 30 to 32 are retracted to the rotating tube 16 side by a pair of cable pinch rollers 33 that rotate in synchronization with the rotating tube 16. , these are wound around the tube material 12 one or more times. And drive motor 1
7 is reversed to drive the rotating tube 16 and cable pinch roller 33 in the opposite direction, and at the same time, the filler wire 29 is fed from the filler wire reel 28 via the conduit cable hose 27 by the filler wire feeding device 26. With the electric power sent through the cab tire hose 30,
Butt part 37 between TIG welding torch 19 and pipe material 12
An arc is generated between the gas hose 31 and
A shielding gas is ejected from the TIG welding torch 19 through the butt welding of the butt portion 42. In this case, the positional deviation of the arc with respect to the butt portion 42 is adjusted by operating the adjustment handle 23 via the torch fine adjustment device 22, and the arc length is automatically adjusted by the AVC 21, so that Automatic circumferential welding is performed.

When there are a large number of pipe materials 12 to be welded, positioning rings 35 are attached to the remaining pipe materials 12 prior to welding or during this welding operation. Then, the support ring 13 is removed from the pipe material 12 that has been welded by rotating the rotating cylinder 16 once in the opposite direction, and this support ring 13 is attached to the next pipe material 1 to be welded.
2 and repeat the above-mentioned procedure to sequentially weld the abutting portions 37.

In this embodiment, the pair of positioning rings 35 are rotatably connected to each other by a hinge 43, but they can also be separated by a pair of connecting members 34, and similarly the support ring 13 itself can be separated. The structure can also be the same. Further, in this embodiment, the case where the tube material 12 is vertical has been described, but welding can be performed without any problem even if the tube material 12 is positioned horizontally.

<Effects of the Invention> According to the pipe circumference welding device of the present invention, the positioning ring is attached to the pipe material in advance, and the support ring to which the welding device is assembled is integrally connected to the positioning ring. It has become possible to efficiently perform circumferential welding of butt portions of pipe materials.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the external appearance of one embodiment of the pipe circumference welding device according to the present invention, FIGS. 2 and 3 are sectional views showing the working process, and FIG. 4 is a conventional pipe circumference welding device. It is a perspective view showing the appearance of an example. In addition, the symbols 11 and 34 in the figure are connecting members, and 12
13 is a support ring, 16 is a rotating cylinder, 17 is a drive motor, 19 is a TIG welding torch, 35 is a positioning ring, 36 is a set screw member, 38 and 39 are locking parts,
40 is a threaded cylinder, 42 is a butt portion, and 43 is a hinge.

Claims (1)

[Claims] 1. A pair of semicircular positioning rings connected in an annular manner so as to surround one of the pair of tube materials whose joint end surfaces are abutted against each other, and each having a semicircular arc shape that is attachable to and detachable from the one tube material; a fixing means capable of fixing the pair of positioning rings attached to at least one of the pair of positioning rings in a connected state to the one pipe material; and a fixing means capable of fixing the pair of positioning rings in a connected state to the one pipe material; a pair of support rings connected annularly adjacent to the rings; tapered locking portions formed on the respective peripheral surfaces of the pair of support rings and the pair of positioning rings and locking each other; a connecting and fixing means that is interposed between the pair of positioning rings and the pair of support rings and expands the distance between them to integrate them via the locking portion; a pair of pivot tubes each having a semicircular arc shape that can be rotatably engaged concentrically with the pair of tube members; and a pair of pivot tubes that are assembled to one of the pair of support rings to drive and rotate the pair of pivot tubes. A tube circumferential welding device comprising a rotating tube driving means and a welding torch attached to one of the pair of rotating tubes and facing the abutting portion of the pair of tube materials.