JPS5914310B2 - Manufacturing equipment for long metal pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a metal pipe containing a long body, which manufactures a metal pipe by forming a metal strip and welding the joints while accommodating the long body inside. .

Conventionally, when welding a seam while forming a metal band while accommodating an optical fiber inside, the opening side of a forming pipe 2 that has been formed while accommodating a long body 1 as shown in FIG. Then, insert the shield gas injection pipe 3 into the forming pipe 2, inject the shield gas into the forming pipe 2, and perform TIG welding on the seam 2A of the ohming pipe 2 from the outside with the welding torch 4. Metal pipe with long body 2
' was manufactured.

However, such a device has a drawback that the heat during welding directly hits the elongated body 1, and the elongated body 1 is likely to be thermally damaged.

In addition, in such a device, the shield gas injection pipe 3
If the surface of the elongated body 1 is rubbed and damaged by the tip of the shield gas injection pipe 3, or if the elongated body 1 has a thin curl, the elongated body 1 may wrap around the shield gas injection pipe 3 and cause damage. There was a missing strawberry that was easy to accept. SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for manufacturing a metal pipe containing a long body, which can perform welding work while protecting the long body.

Hereinafter, specific examples of the present invention will be described in detail with reference to FIGS. 2 to 4.

The apparatus for manufacturing a metal pipe with a long body in this embodiment comprises a forming section 5 and a welding section 6, as shown in FIG.
The forming section 5 includes a group of forming rolls and the like that forms the metal band τ vertically attached to the elongated body 1 that is continuously supplied so that the elongated body 1 is incorporated therein. As shown in FIGS. 3 and 4, the welding section 6 is a welding machine including a welding torch 4 for welding the seam 2A of the forming pipe G-wer 2 that has been formed, and a location where the forming pipe 2 is being welded. and a shield gas supply tool 7 that shields the inner surface of the tank with an inert gas.

The shield gas supply tool 7 includes a first cylinder 8 and a second cylinder 9 that are concentrically combined, and the first cylinder 8 and the second cylinder 9 are connected at the proximal end side and The state is now maintained. An elongate body passage 10 is formed penetrating inside the first cylinder 8 so that the elongate body 1 can pass therethrough. A gas passage 11 is formed inside the second cylinder 9 outside the first cylinder 8, and this gas passage 11 is closed at its proximal end, and shielding gas is supplied from a gas inlet 12 on this side.
It is designed to be ejected from the end 9A of the second cylinder 9. The first tube 8 projects further rearward than the end 9A of the second tube 9 and serves as a heat shield portion 8A always facing the welding torch 4. A long body 1 is provided at the entrance and exit of the long body passage 10.
Guides 14 and 15 made of a lubricant such as tetrafluoroethylene are attached to protect the parts. This type of manufacturing apparatus for a metal pipe containing a long body includes a metal band 7 attached vertically to a long body 1, such as an optical fiber, in a forming section 5.
Roll it into a pipe.

At this time, the shielding gas supply tool 7 is inserted in advance from the opening side of the forming pipe 2 so that the elongated body 1 passes through the elongated body passage 10. Further, the positional relationship between the two is determined so that the heat shielding portion 8A of the first cylinder 8 faces the welding torch 4. Therefore, forming pipe 2
At the welding point of the seam 2A, the elongated body 1 is always protected by the heat shield part 8A of the first cylinder 8, as shown in FIG.
This forming pipe 2 can be advanced by sequentially applying solutions while preventing thermal damage. Furthermore, since the elongated body 1 passes through the shield gas supply tool 7, it can be prevented from being mechanically damaged by the shield gas supply tool 7. Further, since the inner surface of the forming pipe 2 at the location where welding is being performed is shielded with shielding gas, welding can be performed while preventing oxidation. Note that the first cylinder 8
and the second cylinder 9 may be simply arranged side by side and connected to each other without being concentric.

As explained above, in the manufacturing apparatus for a metal pipe containing a long body according to the present invention, the long body is passed through the first cylinder of the shielding gas supply tool, and the heat shielding part of the first cylinder is connected to the welding torch. Since they are arranged to face each other, the welding work can be performed while thermally protecting the elongated body, and thermal damage to the elongated body due to heat during welding, spatter, etc. can be prevented.

Further, in the present invention, since the elongated body is passed through the shielding gas supply tool, it is possible to prevent the elongated body from being mechanically damaged by the shielding gas supply tool. Therefore, according to the apparatus of the present invention, it is easy to weld a long metal pipe while preventing the long body from being thermally and mechanically damaged and preventing the welding tube from being oxidized. can be manufactured.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the conventional manufacturing process of a metal pipe containing a long body, Fig. 2 is a block diagram of a manufacturing apparatus for a metal pipe containing a long body according to the present invention, and Fig. 3 is a shield used in the present invention. FIG. 4 is a vertical cross-sectional view showing one embodiment of the gas supply tool, and FIG. 4 is a vertical cross-sectional view showing an example of the manufacturing process of a metal pipe containing a long body using the apparatus of the present invention. 1... one elongated body, 2... forming pipe, 2'... metal pipe with elongated body, 7...
...Metal band, 2A... Seam, 4...
...Welding torch, 5... Forming part, 6.
...Welding part, 7 ... Shield gas supply tool, 8 ... First cylinder, 8A ... Heat shield part,
9...Second cylinder, 10...Elongate body passage, 11...Gas passage, 12...Gas inlet.

Claims (1)

[Claims] 1. A forming part that forms a forming pipe by forming a metal band vertically attached to a long body so that the long body is built in, and a shielding gas supply tool that is inserted into the inside from the opening side of the forming pipe. and a welding section for sequentially welding the joints of the forming pipe from the outside with a welding torch of a welding machine while supplying shielding gas into the pipe. In the manufacturing apparatus, the shielding gas supply tool includes a first cylinder through which the elongated body passes, and a second cylinder through which the shielding gas is supplied and ejected, and the first cylinder is connected to the first cylinder. A manufacturing apparatus for a metal pipe containing a long body, characterized in that a heat shield portion is formed to protrude rearward from an end of the second tube and face the welding torch.