JPH0734935B2 - Cooling roll equipment for manufacturing welded metal pipes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a roll device used for producing a metal pipe by forming a metal tape into a cylindrical shape and welding both side edge abutting portions thereof. In particular, the present invention relates to a cooling roll device for welding while cooling a cylindrical molded body of a metal tape.

[Conventional technology and its problems]

When manufacturing a welded metal pipe containing a plastic coated wire such as an optical fiber core wire or insulated wire inside, in order to prevent the internal plastic coated wire from being damaged by the heat during welding, At the welding position, the roll holding the cylindrical formed body of the metal tape is cooled, thereby indirectly cooling the cylindrical formed body so that the plastic-coated linear body is not overheated. 35344 publication).

The conventional cooling roll device used for this kind of purpose has a structure in which cooling water is passed through the inside of the roll body that holds the cylindrical molded body of the metal tape, and the roll body is made of copper to improve thermal conductivity. It is made of metal such as. However, the roll body is placed near the electrode for arc welding (TIG welding, etc.), so if it is made of metal, arc discharge may occur between the electrode and the roll body, causing damage to the roll body due to arcing. There is a drawback that is likely to occur.

Cooling water is supplied to the roll main body through the center of a stationary shaft that rotatably supports the roll main body, and cooling water discharged from the roll main body is received by a container arranged around the stationary shaft and connected to the container. The stationary shaft adjusts the vertical position of the roll body, so it is necessary to enable vertical adjustment.
When the hose is drawn out from the container arranged around the stationary shaft as described above, there is a drawback that the hose becomes an obstacle and it is difficult to perform vertical adjustment.

In addition, the chill roll device including the welding electrode is covered with a cover to eliminate the influence of foreign matter and wind pressure from the outside and to ensure stable welding. If the structure is provided, there is a drawback in that the piping becomes an obstacle, and the work of setting and removing the cover becomes complicated at the time of roll adjustment and opening of the metal tube.

[Means for solving the problem and its action]

The present invention provides a cooling roll device for manufacturing a welded metal pipe, which solves the problems of the prior art as described above, and its configuration is a roll body having a groove for holding a cylindrical formed body of a metal tape on the outer periphery thereof. , A stationary shaft that rotatably supports the roll main body at the upper end, a roll base that is disposed below the stationary shaft and that supports the static shaft vertically adjustable, and the roll main body is a cylindrical molded body. The roll main body is made of ceramics at least in the vicinity of the upper edge of the groove, and a cooling water passage is provided inside the roll main body. Is provided with a feed passage for feeding the cooling water to the cooling water passage, and a return passage for collecting the cooling water discharged from the roll main body. Communication Wherein a cooling water inlet passage which communicates, in that a cooling water outlet passage communicating with the cooling water return passage of the stationary shaft.

That is, the present invention eliminates arc discharge between the welding electrode and the roll body and prevents damage to the roll body by making at least the vicinity of the upper edge of the groove of the roll body (the portion approaching the welding electrode) made of ceramics. There is.

In addition, a cooling water feed passage and a return passage are provided on a stationary shaft that rotatably supports the roll body, and a cooling water inlet passage is also provided on a roll table that is disposed below the stationary shaft and supports the stationary shaft so that it can be adjusted up and down. By providing the outlet passage and the outlet passage, the vertical position of the roll body can be easily adjusted without being hindered by the cooling water pipe.

Furthermore, since a roll base that supports the static shaft so that it can be adjusted up and down is provided below the stationary shaft, the weight of the roll body and the stationary shaft is received by the lower roll base, and the center of gravity of the roll body and the stationary shaft is received. And the center of gravity of the roll base become closer, the bending moment applied to the roll base becomes smaller due to the weight of the roll body and the stationary shaft, and the structure of the roll device becomes compact and robust, enabling installation in a narrow space. ing. Further, since the roll main body is firmly supported by the roll base, the rotation of the roll main body does not run out, the welding is performed stably, and it is possible to manufacture the welded metal pipe having excellent quality with high yield.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 show an embodiment of the present invention. In the figure, 11 is a cylindrical molded body of metal tape, 12 is an electrode for arc welding the joint, and 13 is a plastic-coated linear body housed in the cylindrical molded body. The cooling roll device of the present invention is arranged on both sides of the cylindrical molded body 11 of metal tape, but since the left and right structures are symmetrical, one side thereof will be described.

21 is a ceramic ring body having a semicircular groove 22 formed on the outer periphery,
23 is a metal ring body with a ceramic ring body 21 fitted on the outer periphery, and 24
Is a lid that covers the ceramic ring body 21, and these constitute a roll body 25 that holds the cylindrical molded body 11 of the metal tape. The lid body 24 is fixed to the metal ring body 23 with screws 26. A large number of cooling water passages 27 penetrating in the vertical direction are provided in the metal ring body 23 at predetermined intervals in the circumferential direction.

The roll body 25 has a bearing 30 at the upper end of an upright stationary shaft 29.
It is rotatably supported via. A threaded portion 31 is formed on the outer periphery of the lower end of the stationary shaft 29.
It is supported by being screwed into a roll base 33 arranged at the lower part of the shaft. When the stationary shaft 29 is rotated, the stationary shaft 29 moves up and down, and the heights of the stationary shaft 29 and the roll body 25 can be adjusted up and down. It is like this. Reference numeral 34 is a lock nut that fixes the stationary shaft 29 so as not to rotate after adjusting the height of the roll body 25.

A cooling water feed passage 35 is provided at the center of the stationary shaft 29. A gap 36 is provided between the upper end of the stationary shaft 29 and the lid 24, and the gap 36 serves as a communication passage between the feed passage 35 and the cooling water passage 27 in the metal ring body 23. Also stationary axis
A container 37 for receiving the cooling water discharged from the roll body 25 is fixed to the outer periphery of the middle portion of 29. Further, a portion of the stationary shaft 29 below the container 37 has a thick outer diameter, and a cooling water return passage 38 is formed in that portion.

Inside the roll base 33, a cooling water inlet passage 42 and a cooling water inlet passage 43 are formed, which communicate the lower surface side with the bottom of the screw hole 41 of the stationary shaft 29. The upper end of the inlet passage 42 is located at the center of the screw hole 41, and the base of the nipple 44 is inserted and fixed therein. The upper half of the nipple 44 is inserted into the feed passage 35 of the stationary shaft 29, and the stationary shaft 29 is slidable with respect to the nipple 44 both in the axial direction and in the circumferential direction. Between nipple 44 and stationary shaft 29 and nipple 44
The O-rings 45 and 46 form a watertight structure between the roll stand 33 and the roll stand 33. The nipple 44 is for preventing the cooling water sent to the feed passage 35 in the stationary shaft 29 and the cooling water discharged from the return passage 38 from being mixed. Also roll stand
On the lower surface side of 33, the cooling water supply hose 47 is provided in the inlet passage 42.
Cooling water discharge hoses 48 are connected to the outlet passages 43, respectively.

An adjusting screw 51 is screwed into the roll base 33 in a direction orthogonal to a vertical plane passing through the axis of the metal tape cylindrical molded body 11, and guides 52 are provided in the front and rear of the roll base 33 in the same direction as the adjusting screw 51. is set up. Therefore, when the adjusting screw 51 is rotated, the roll base 33 moves along the guide 52, and the position of the roll main body 25 in the direction of approaching and separating from the metal tape cylindrical molded body 11 can be adjusted.

As is clear from the above description, in this device,
The cooling water is fed into the roll main body 25 through the supply hose 47, the inlet passage 42, the nipple 44, the feed passage 35, and the gap 36, and cools the metal tape cylindrical molded body 11 via the roll main body 25. . Then, the cooling water discharged from the roll body 25 is discharged through the container 37, the return passage 38, the outlet passage 43, and the discharge hose 48.

〔The invention's effect〕

As described above, according to the present invention, since at least the upper edge vicinity of the groove of the roll body is made of ceramics, arc discharge between the welding electrode and the roll body is eliminated,
Since the roll body can be prevented from being damaged by the arc, the life of the roll body can be extended and the operating rate of the apparatus can be improved.

In addition, the cooling water that cools the roll body can be supplied and discharged from the lower side of the roll base that is disposed below the stationary shaft that supports the roll body and that supports the stationary shaft so that it can be adjusted up and down. The position adjustment in the direction can be easily performed without being hindered by the cooling water pipe, and there is an advantage that the workability is significantly improved.

Furthermore, since a roll base that supports the static shaft so that it can be adjusted up and down is provided below the stationary shaft, the weight of the roll body and the stationary shaft is received by the lower roll base, and the center of gravity of the roll body and the stationary shaft is received. And the center of gravity of the roll base become closer, the bending moment applied to the roll base due to the weight of the roll body and the stationary shaft becomes smaller, and the structure of the roll device becomes compact and robust, enabling installation in a narrow space. Become. Further, since the roll main body is firmly supported by the roll base, the rotation of the roll main body does not run out, the welding is performed stably, and it becomes possible to manufacture a welded metal tube of excellent quality with high yield.

[Brief description of drawings]

FIG. 1 is a front view of a cooling roll device according to an embodiment of the present invention and a sectional view in the same direction, and FIG. 2 is a partially cutaway side view of the device. 11: Cylindrical molded body of metal tape, 12: Welding electrode, 21: Ceramic ring body, 22: Groove, 23: Metal ring body, 24: Lid body, 25: Roll body, 27: Cooling water passage, 29: Stationary shaft , 30: bearing, 31: screw part, 33: roll base, 34: lock nut, 35: cooling water feed passage, 36: gap, 37: container, 38: cooling water return passage, 42: cooling water inlet passage, 43 : Cooling water outlet passage, 44: Nipple, 51: Adjustment screw, 52: Guide.

Claims (1)

[Claims] 1. A roll main body having a groove for holding a cylindrical molded body of a metal tape on the outer circumference, a stationary shaft rotatably supporting the roll main body at an upper end, and a stationary shaft disposed below the stationary shaft. A roll base that supports vertically adjustable, and an adjustment mechanism that adjusts the roll base in a direction in which the roll main body approaches and separates from the cylindrical molded body, and the roll main body is made of ceramic at least near the upper edge of the groove. In addition, a cooling water passage is provided therein, and the stationary shaft has a feed passage for feeding cooling water to the cooling water passage of the roll body and a return passage for collecting cooling water discharged from the roll body. Is provided, and further on the roll base, from the lower surface side thereof,
A cooling roll apparatus for manufacturing a welded metal pipe, comprising: a cooling water inlet passage communicating with a cooling water feed passage of the stationary shaft; and a cooling water outlet passage communicating with a cooling water return passage of the stationary shaft.