JPS59156524A - Pipe expanding device - Google Patents

Abstract

PURPOSE:To expand a pipe to a uniform shape with improved workability and to smooth the succeeding connecting operation of the pipes by providing an expanding die and a member for expanding the die so that the pipe can be partially expanded. CONSTITUTION:A titled device consists of an expanding die 16, a tapered expanding member 18, and a driving source 22 which drives the member 18 in an axial line direction. The die 16 consists of plural segments engaging with the inside circumferential surface in the end part of the pipe 1 to be expanded, and is held freely slidably in the diametral direction in a holder. The member 18 is so held as to move axially in a horizontal direction by engaging with the inside surface of the die 16.

Description

[Detailed Description of the Invention] The invention relates to a device for expanding large-diameter pipes such as large-capacity aerial power transmission lines, outer pipes of gas-sealed busbars, and pipes of various pipelines in order to interconnect them. be.

Conventionally, in order to connect large diameter pipes of this type, a connecting pipe was welded across the pipes to be connected. Unfortunately, this method requires a lot of welding time, is inefficient, and is expensive. It also allows dust to get inside, and the connections are unstable, requiring special tools and jigs for the work. There was a certain drawback.

On the other hand, as shown in Figs. If the pipe is expanded so that the expanded ends of one of the pipes meet at the retracted position 2b, the number of welding steps will be reduced to one location, improving work efficiency, making it difficult for dust to enter, and making the connection stable. preferable.

However, the work of expanding the pipe was troublesome, and it was difficult to expand the pipe to a uniform diameter.

The object of the invention is to provide a tube expansion device that can partially expand a tube in this way.

Embodiments of the present invention will be described in detail with reference to the drawings.
The figure shows a tube expansion device 10 according to the present invention, and this tube expansion device 1
0 is a machine frame 12 that is approximately U-shaped when viewed from the side, and this machine frame 12.
a tube expansion die 16 consisting of a plurality of segments 14, which is arranged horizontally in front of the pipe and into which the end portion 1a (or 2a) of the pipe 1 (or 2) to be expanded is fitted and engaged with the inner portion thereof; A tapered diameter expanding member 18 that engages with the inner surface of the tube expanding die 16 is provided.

As shown in FIG. 4, the tube expanding die 16 is held such that the collar 14a of each segment 14 thereof is inserted into an annular holder provided at the front of the machine frame 12 so as to be slidable in the radial direction.
On the other hand, the diameter expanding member 18 is held so as to be axially movable in the horizontal direction. Note that various types of tube expansion dies 16 can be prepared depending on the tube expansion shape.

The driving source consists of an air cylinder 24 supported by the machine frame work 2, and the piston rods 2, 1a of this air cylinder
is connected to the diameter expanding member 18. As shown in FIG. 5, the expanding diameter member 18 is arranged so that the Taber diameter decreases from the front toward the inside, and the piston rod 24a is connected to its small diameter end, so that the air cylinder The diameter expanding member 18 is expanded in the retraction direction.

Next, let us describe the state of use of the non-invented device.
As shown in Figure (4), using a pipe expanding die 6A with a circular outer periphery, one pipe
The end portion 1a of the air cylinder 18 is fitted, and the air cylinder head is driven in the retraction direction to retract the diameter expanding member 18 in the direction of arrow a'. In this way, each segment of the tube expansion die 16A is connected to the diameter expansion member 1.
Displaced radially outward along the Taber surface of pipe 1
The end portion 1a of the tube is expanded into a cylindrical shape. Next, as shown in FIG. 5(B), using a tube expanding die 16B having an annular protrusion 16b on the outer periphery, the end 2a of the other pipe 2 is fitted to the tube expanding die 16B, and the air cylinder is driven in the retracting direction. do. With this comb, when each segment of the tube expansion die 16B is displaced radially outward, the end portion 2a is expanded;
Particularly, a part of the tube is formed with an annular protrusion 2b at the expanded tube end by an annular protrusion 16b. The outer diameter of the expanded end 2a of the pipe 2 is set to be slightly smaller than the inner diameter of the expanded end 1a of the pipe 1. In this way, the ends la, 2a
After the pipes 1 and 2 are expanded, the pipes 1 and 2 are fitted and welded together as shown in FIGS. 1 and 2. Although the pipes 1 and 2 may be expanded using separate expansion devices, it is preferable that the tube expansion dies 16A and 16B, together with their holders, are exchangeable and that they are processed using a common device.

According to the present invention, as mentioned above, it is possible to partially expand a pipe using an hour wheel device, which improves work efficiency.In particular, the expansion work can be performed with the pipe held horizontally, so long pipes can be expanded. Pipe expansion work can be easily carried out, and since the shape of the pipe can be uniformly expanded using a pipe expansion die, there is a practical benefit in that the subsequent pipe connection work can be smoothly performed.

[Brief explanation of the drawing]

1 and 2 are a partially cutaway perspective view and an enlarged sectional view showing a state in which two pipes are connected, FIGS. 3 and 4 are a perspective view and an enlarged internal sectional view of the pipe expansion device of the present invention, and FIG. figure(
A) and (B) are diagrams illustrating the operation of the inventive device. 1.2------Pipe, 1 FLs 2 a---111 end, 10---1 tube expansion device, 14------Segment, 16.16A, 16B---1 tube expansion Dice, 18--Tapered diameter expanding member, η--Drive source.

Claims (1)

[Claims] A tube expansion die which is comprised of a plurality of segments arranged horizontally and engaged with the inner periphery of the end of the pipe to be expanded and is held slidably in the radial direction in a holder; A tube expanding device comprising: a tapered diameter expanding member held so as to move axially; and a drive source for driving the diameter expanding member in the axial direction.