JPS5915746B2 - Branch pipe welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for welding a branch pipe to a main pipe.

As shown in Fig. 1, when welding the branch pipe 2 to the main pipe 1, it is necessary to drive the welding torch along the saddle-shaped interpenetrating joint line 3 between the main pipe 1 and the branch pipe 2. There is.

FIG. 2 is a diagram showing a conventional branch pipe welding device. In the figure, 4 is a side beam, 5 is a saddle-shaped welding device fixed to the side beam 4, and 6 is a welding torch attached to a saddle-shaped welding device 10. 3. In order to weld the branch pipe 2 to the main pipe 1 using this device, first, the branch pipe 2 is tack-welded to the main pipe 1, and then the welding torch 6 is welded using the saddle type welding device 5.
15, that is, the welding torch 6 is rotationally moved while gripping the center line of the branch pipe 2, and the welding torch 6 is moved up and down to perform welding. Note that this welding is normally performed by MIG welding, carbon dioxide arc welding, submerged arc welding, or the like. However, this device has the following problem when the diameter of the branch pipe 2 exceeds approximately 1/3 of the diameter of the main pipe 1. As shown in FIG. 3, which shows a state in which the welding torch 6 has been moved 900 rotations from the state shown in FIG. Because the slope of the part is steep, the molten metal □ drips down due to the action of gravity during welding, making it easy to cause welding defects and making automatic welding impossible. A branch pipe welding device as shown in the figure has been proposed.

In this device, a main pipe 1 with branch pipes 2 tack-welded is attached to a rotating device 8, a welding torch 6 is attached to a torch moving device 9,
The main pipe 1 is rotated by the rotating device 8 with the center line of the branch pipe 2 as the rotation axis.
Welding is performed automatically by rotating the welding torch 9 and laterally moving the welding torch 9 according to the rotation angle of the main pipe 1 using a 35 torch moving device 9. This ensures that the weld is always on top and that no molten metal drips down. However, since the main pipe 1 is rotated with the center line of the branch pipe 2 as the rotation axis, the main pipe 1. There is a problem in that this device cannot be used if the length or weight of the device is large. This invention was made to solve the above-mentioned problems, and even if the ratio of the diameters of the branch pipe and the main pipe is 1/3 or more, the molten metal will not drip down, and the main pipe To provide a splicing device for branch pipes capable of automatically splicing even if the pipes are long and heavy.

In order to achieve this object, the present invention provides a device for bringing a branch pipe into close contact with a main pipe, including a main pipe rotation device that reciprocates the main pipe while keeping the main pipe substantially parallel to the center line of the main pipe; A saddle-shaped welding device having a welding torch that rotates and moves up and down approximately about the center line of the branch pipe, and that rotates back and forth in the same phase in conjunction with the rotation of the main pipe; A torch rotation angle detection device detects the rotation angle, and based on the torch rotation angle detected by the torch rotation angle detection device, the tip of the welding torch is located on a vertical line passing approximately through the center line of the main pipe. and a main pipe rotation angle control device for controlling the rotation angle of the main pipe rotated by the main pipe rotating device so that the main pipe is positioned at .

FIG. 5 is a diagram showing a branch pipe welding device according to the present invention.

In the figure, 10 is a main pipe rotation device that reciprocates the main pipe 1 with the center line of the main pipe 1 substantially horizontal, 10a is a rotating part of the main pipe rotating device 10, and 11 is provided in the rotating part 10a. The chuck grips one end of the main pipe 1 to which the branch pipe 2 is temporarily attached by the chuck 11. 13 is a roller, and the main tube 1 is placed on the roller 13.

12 is a holder fixed to the rotating part 10a, and the holder 12
A saddle-shaped connecting device 5 is attached to the saddle type 1? The contact device 5 is interlocked with the rotation of the main tube 1 and rotates back and forth in the same phase.

The saddle-shaped welding device 5 includes a fermentation welding torch 6 that rotates about the center line of the branch pipe 2 and moves up and down.
is provided. 15 is a torch rotation angle measuring device for detecting the rotation angle of the receptive torch 6;
5 is provided within the saddle-shaped contact device 5.

16 is a main tube rotation angle control device provided in the main tube rotation device 10, and the main tube rotation angle control device 16 controls the rear torch 6 based on the torch rotation angle detected by the torch rotation angle detection device 15. The angle of the rotating part 10a, that is, the rotation angle of the main tube 1 rotated by the main tube rotating device 10) is controlled so that the tip of the main tube 1 is located on a vertical line passing approximately through the center line of the main tube 1.

In this branch pipe expansion device, when the connection torch 6 is rotated and moved up and down, the torch rotation angle detection device 15 detects the rotation angle of the connection torch 6, and the main pipe rotation angle control device 16 detects the rotation angle of the connection torch 6. Based on the rotation angle detected by the torch rotation angle detection device 15, the rotation angle of the main pipe 1 is controlled so that the tip of the welding torch 6 is located on a vertical line passing approximately through the center line of the main pipe 1. Therefore, the main pipe 1 is reciprocated by the main pipe rotating device 10, and the saddle-shaped welding device 5 is rotated reciprocatingly in conjunction with the rotation of the main pipe 1 in the same phase. That is, when the welding torch 6 rotates in the direction of arrow B and moves downward from the state shown in FIG. When rotated 90 times from the state shown in FIG. 5, the state shown in FIG. 6 is reached. From this state, when the welding torch 6 further rotates in the direction of arrow B and moves up and down, the main pipe 1 and the saddle-shaped welding device 5 now rotate in the direction of arrow D. Then, when the welding torch 6 rotates 180 degrees in the direction of arrow B from the state shown in FIG. The contact device 5 rotates again in the direction of arrow C. In this way, when the welding torch 6 makes one rotation in the direction of arrow B, the main pipe 1 makes one reciprocating rotation in the directions of arrows C and D, but each saddle-shaped contact rotates in conjunction with the rotation of the generatrix 1 and in the same phase. Since the device 5 rotates back and forth, is it a saddle shape with the main pipe 1? Since it does not move relative to the contact device 5, ?
Since the contact torch 6 rotates about the center line of the branch pipe 2 and also moves up and down, the arc generating part 14 moves along the mutual tangent line, and the main pipe 1 and the branch pipe 2 are brought into contact with each other. Ru. Then, the rotation angle of the main pipe 1 is controlled by the main pipe rotation angle control device 16 so that the tip of the connection torch 6 is located on the vertical line passing through the center line τ of the main pipe 1, so that the arc The generating part 14 is always located at the top of the main pipe 1. In the embodiment shown in FIGS. 5 and 6, the rotating part 10a
Although the saddle type welding device 5 is attached to the main pipe 1 via the holder 12, it is also possible to attach a removable fixing jig to the main pipe 1 itself and hold the saddle type welding device 5 with that fixing jig. It is possible to reciprocate the saddle-shaped displacement device 5 in conjunction with the rotation of the main tube 1 in the same phase, and this is particularly effective when the length of the main tube 1 is large. As explained above, the branch pipe according to this invention? For contacting equipment, the arc generating part 14
is always located at the top of the main pipe, so the connecting part can be kept almost horizontal, so the diameter of branch pipe 2 is equal to that of main pipe 1.
Even if the diameter is 1/3 or more, the molten metal will not drip down, and therefore no bonding defects will occur due to the molten metal dripping.

Furthermore, since the main pipe 1 is rotated around the center line of the main pipe 1 rather than the center line of the branch pipes 2, and the center line of the main pipe 1 is almost horizontal, the main pipe 1 is extremely long. Even if the main pipe 1 is heavy and heavy, the branch pipes 2 can be easily and automatically connected. As described above, the effects of this invention are remarkable.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the branch pipe attached to the main pipe, Figure 2
The figure shows a conventional branch pipe connection device, and Figure 3 is A of Figure 2.
-A sectional view showing the state in which the wide contact torch has been rotated by 90A from the state shown in FIG. 1, FIG. 4 is a diagram showing another conventional branch pipe connection device, and FIG. FIG. 6 is a front view showing an embodiment of the pipe welding device, and FIG. 6 is a side view showing the operating state of the branch pipe welding device shown in FIG. 1... Main pipe, 2... Branch pipe, 3...
...interpenetrating joint line, 4...side beam, 5...
・・・・・・Saddle-shaped welding device, 6... Connection torch, 7
...? Molten metal, 8...Rotating device, 9.
...Torch moving device, 10...Main tube rotating device, 10a...Rotating part, 11...Chuck, 12...Holder, 13.i... Laura.

Claims (1)

[Claims] 1. In a device for welding a branch pipe to a main pipe, the main pipe is
A main pipe rotation device that rotates reciprocatingly with the center line of the main pipe substantially horizontal, and a welding torch that rotates and moves up and down approximately about the center line of the branch pipe, and is interlocked with the rotation of the main pipe. a saddle-shaped welding device that reciprocates in the same phase; a torch rotation angle detection device that detects the rotation angle of the welding torch;
Based on the torch rotation angle detected by the torch rotation angle detection device, the welding torch is rotated by the main tube rotation device so that the tip of the welding torch is positioned on a vertical line passing approximately through the center line of the main tube. A branch pipe welding device comprising: a main pipe rotation angle control device for controlling a rotation angle of a main pipe.