JPS63130216A - Continuous welding equipment for short-sized pipe - Google Patents

Abstract

PURPOSE:To stably transfer even a short-sized material and to conform to weld the different diameter pipes by tightening and welding a cylindrical material fed by the rolls more than two pairs whose feeding speed is fast on the upstream side inserting a rotating guide plate of a mandrel seaming guide. CONSTITUTION:The cylindrical work 1 fed by a preceding aligning part and positioning part in a state of facing the seaming part 1a upward is transferred by two pairs of feed rolls 26a-26d in the state of inserting the seaming part 1a by a seam guide 24 of a mandrel 23 supported horizontally by supports 21, 22. At that time, the rotary guide plate 27b supported on the mandrel 23 by a shaft 27a is provided to the seam guide part 24 inserted by the feed rolls 26a-26d to smoothen the transfer to increase the feed speed of the upstream feed rolls faster than the downstream feed speed to feed the work 1 continually. Then, the outer diameter is tightened by the squeeze rolls 31a-31d at the welding toach 30 part to weld successively. Therefore, the work 1 is stably fed successively even it is short one and even though at the time of changing the diameter of the work, it is possible to conform.

Description

Detailed Description of the Invention "Field of Industrial Application" This invention involves forming a metal plate cut into a predetermined size into a cylindrical shape, and welding the seam of this cylindrical workpiece to continuously form a short pipe. This invention relates to continuous welding equipment for short pipes.

"Prior art" Generally, when manufacturing a vibrator (short tube), long lengths (4 to 6
m) The method of cutting the pipe material to the required length is adopted, but with this method, manufacturing costs are high due to material loss due to cutting, labor for finishing the end face, and wear and tear on tools. Moreover, since a certain amount of pipe materials must be kept in stock at all times, it is necessary to secure a large inventory space, and as a result, an increase in costs is unavoidable.

Therefore, in recent years, a method has been developed in which a hoop material is cut into a predetermined size in advance, the hoop material is formed into a cylindrical shape, and the seam portion of this cylindrical workpiece is welded to continuously form a pipe of a desired length. A continuous welding device for short pipes has been developed.

FIGS. 3(a) and 3(b) are a plan view and a front view showing a schematic configuration of this type of short pipe continuous welding device. In these figures, 1.1. ... are cylindrical-shaped workpieces, which are sequentially supplied onto the alignment section 2 from the right side of the drawing. The alignment section 2 includes a guide plate 3 and a plurality of drive rolls 4, 4 . . . , and these drive rolls 4, 4 . As the workpieces 11, . The positioning section 5 is
A positioning temporary 6 and a plurality of drive rolls 7.7 provided in a direction orthogonal to the feeding direction of the work l. . . . By inserting the positioning temporary 6 into the open seam portion 1a of each work l, the position of the seam portion 1a is regulated upward, whereby the work 1. ■,...
is fed into the next welding section 8 with the seam portion 1a facing upward. The welding part 8 is connected to the workpiece 1.1. Four pairs of squeeze rolls sandwiching ... from both sides 9.9. ...
and a welding torch 10 for welding the seam IE Ia of the workpiece 1, and squeeze rolls 9, 9 .
By tightening the work l by ..., the seam portion 1a is butted together, and at the same time, the welding torch 10
Then, the seam portion 1a is welded. The welded workpieces 1 sent out from the welding section 8 are urged upward one by one by a discharge cylinder 12 provided in a discharge section 11, and the welding bead lb is cut off before being discharged. In the manner described above, pipes of a predetermined length are continuously manufactured.

"Problems to be Solved by the Invention" By the way, in the conventional short pipe continuous welding apparatus described above, for example, if the diameter of the pipe is 50 mm, it is impossible to manufacture a short pipe with a length dimension of 200 mm or less. It was possible. That is, the cylindrical work l that has reached the welding part 8 is moved by four pairs of squeeze rolls 9, 9 . . . . At least two pairs of squeeze rolls 9, 9 . . . ...
If they are not in constant contact, stable transfer will not occur. Here, squeeze roll 9.9. If the radius of ... is set to be approximately the same as the diameter of workpiece I, the length of workpiece I must be at least four times the diameter of workpiece I in order to ensure stable transfer. Therefore, it is impossible to manufacture a pipe with a length dimension that is four times or less the diameter of the pipe. Furthermore, when changing the diameter of the pipe to be manufactured, the squeeze roll 9
,9. There was a problem in that the diameter of the squeeze rolls 9°9, .

This invention was made in view of the above-mentioned circumstances, and it is possible to stably transfer the workpiece regardless of the length of the cylindrical workpiece. It can be manufactured continuously and furthermore,
It is an object of the present invention to provide a short pipe continuous welding device that can immediately respond to changes in the diameter of a workpiece.

"Means for Solving the Problem" This invention involves forming a metal plate cut into a predetermined size into a cylindrical shape, and welding the seam of this cylindrical workpiece with a welding torch to continuously form short pipes. In the short pipe continuous welding apparatus to be manufactured, the cylindrical workpieces that are sequentially sent are sent out with a mandrel that supports the cylindrical workpieces movably in the feeding direction, and a plurality of workpieces supported by the mandrel are held in between, At least two or more pairs of feed rolls each having a rotational speed set such that the upstream feed speed is higher than the downstream feed speed, and the seam portion of the workpiece supported by the mandrel, It consists of a seam guide that guides the workpiece to the welding position to be welded by a welding torch, and a squeeze roll that tightens the workpiece that has reached the welding position from the outer circumferential direction to butt the seam part, and of the seam guide, at least: A portion corresponding to the portion where the workpiece is held between the feed rolls is configured by a rotatably provided disc-shaped guide plate.

"Operation" A plurality of cylindrical workpieces are supported by a mandrel, and are further fed out one after another while being held between at least two pairs of feed rolls, and the seam portions of the workpieces are welded by a seam guide. When the workpiece is guided to the welding position, it is squeezed from the outer circumferential direction by a squeeze roll, the seam portions are matched, and the seam portions are welded in this state. In this case, among the two or more pairs of feed rolls, the rotation speed of each feed roll on the upstream side is set so that the feed speed of the feed roll on the downstream side is higher than the feed speed of the feed roll on the downstream side. The rear end of the workpiece located on the side always contacts and biases the rear end of the workpiece located on the downstream side, so stable transfer is always performed regardless of the length of the workpiece, and as a result, It is now possible to continuously manufacture pipes that are shorter in length than conventionally.

In addition, at least the portion of the seam guide corresponding to the portion where the workpiece is held between the feed rollers is configured with a rotatably provided disk-shaped guide plate, so that the workpiece is not held between the feed rollers. ,
Even when the seam portion is narrowed, the guide plate rotates while contacting the seam portion, so that stable transfer of the workpiece is not hindered.

Embodiment J An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1A, 1B, and 1C are a plan view, a front view, and a side view showing the structure of an embodiment of the present invention.

In these figures, 20 is a base, and this base 20
Supports 21 and 22 are vertically provided on the upper surface, and these supports 21 and 22 support a rod-shaped mandrel 23.
is supported horizontally.

That is, on the upper surface of the mandrel 23, there is a plate-shaped guide portion 24a divided into three along the axial direction.

24b and 24c are formed, and this guide portion 24a
, 24b, 24c are fixed to a plate material 25, and the plate material 25 is attached to the upper ends of the columns 21 and 22. In this case, the plate material 25 is formed so that its thickness gradually becomes thinner at its starting end 25a (the left end in FIGS. 1(A) and 1(B)) and at its terminal end 25b. In addition, the mandrel 23 used has a diameter slightly smaller than the diameter of the pipe to be manufactured, and the starting end 23g of the mandrel 23 is used.
As shown by arrow A in Figure 1 (a) and (b),
Cylindrical workpieces are sent sequentially from the left 1. l,・
The corners of the receiver are rounded off to make it easier to insert the receiver, making it roughly hemispherical. On the other hand, the workpiece 1 is placed between the starting end side guide part 24a and the central guide part 24c formed on the mandrel 23, and between the central guide part 24c and the terminal end side guide part 24b, that is, between the feed rollers 26a and 2, which will be described later.
6b and the feed roller 26
As shown in FIG. 2, a disc-shaped guide plate 27 is provided at the position P2 held by the guide plates 26c and 26d. This guide plate 27 is housed in a recess 23c formed in the mandrel 23, and is rotatably supported within the four parts 23c via a sleeve 27a provided in a direction perpendicular to the transport direction of the work l. There is.

As a result, the guide plate 27 has its peripheral edge 27b fitted into the seam portion 1a of the work l, so that it can rotate as the work l moves.

A seam guide G is constituted by the guide portions 24a, 24b, and 24c described above and the guide plates 27 and 27.

Next, between the columns 21 and 22 on the upper surface of the base 20,
Two pairs of feed rolls 26 a, 26 b, 26 c, 26
d are provided so as to be able to rotate in a horizontal plane approximately at the same height as the axis of the mandrel 23, and the mandrel 2
They are arranged along both sides of the central part of 3.

The rotational force of the drive motor 29 is transmitted to these feed rolls 26a to 26d via a transmission mechanism comprised of a plurality of reduction gears, a torque limiter, etc. housed in a case 28. As a result, the feed rolls 26a to 26d are rotated in the directions indicated by arrows in the figure. In this case, rotational force is transmitted to the pair of feed rolls 26a and 26b located upstream in the transport direction of the work l via a reduction gear and a torque limiter, and
The rotational force is transmitted to the pair of feed rolls 26c and 26d located on the downstream side in the transport direction of the workpiece 1 through only a reduction gear, and furthermore, the rotational speed of the upstream feed rolls 26a and 26b is the same as that of the downstream side. The reduction ratio of the reduction gear is appropriately set so as to be slightly higher than the rotational speed of the feed rolls 26c and 26d. Further, the feed rolls 26a to 26d are...
It is made of, for example, synthetic resin, rubber, or the like having appropriate flexibility so as to be in close contact with the outer circumferential surface of the workpiece I and to exert a sufficient frictional force between it and the workpiece I.

Next, an n-th support plate 32 for supporting the welding torch 30 and squeeze rolls 31a to 31d is arranged near the support column 22 on the upper surface of the base 20 so that its plate surface is perpendicular to the axis of the mandrel 23. It is installed vertically in a vertical position. A circular hole 32a having a diameter larger than the diameter of the work l is formed in the center of the support plate 32, and the terminal end 23b of the mandrel 23 is inserted into the circular hole 32a. It protrudes from the plate surface of the support plate 32.

The welding torch 30 has its tip 30a connected to the mandrel 2.
3 toward the axial direction of the terminal end 23b and the tip 30a
is supported by the welding torch support mechanism 33 in a state where it is positioned on the extension line of the guide portion 24b. In this case, the welding torch support mechanism 33 has a function of adjusting the inclination angle of the welding torch 30 to any color. On the other hand, the squeeze rolls 31a to 31d are connected to the terminal end 23 of the mandrel 23 protruding from the circular hole 32a.
They are arranged radially around the axis b, and are rotatably supported by squeeze roll support mechanisms 34a to 34d, respectively. In this case, the squeeze roll support mechanism 34.
a to 34d have adjustment mechanisms that widen or narrow the positions of the squeeze rolls 31a to 31d in the radial direction of the mandrel 23.
By adjusting the positions of a to 31d, the mandrel 2
Appropriate tightening force is applied from the outer circumferential direction to the work l that has been transferred along the
The seam portions 1a of the welding torch 30 are butted against each other with an appropriate force at a welding position Y (see FIG. 1(c)) facing the tip 30a of the welding torch 30.

Next, the operation of the above-mentioned embodiment will be explained.

As shown by arrow A in Figure 1 (a) and (b), ;(
When a number of cylindrical workpieces I are sequentially fed from the left side of the drawing, these workpieces I are placed at the starting end 23 of the mandrel 23.
They are inserted sequentially starting from a, and as shown in FIG. 3, are supported by the mandrel 23 in a state where the gap between the seam portion 1a, which has not yet been welded, is fitted into the guide portion 24a.

Next, the plurality of works l supported by the mandrel 2 are sequentially sent out as the feed rolls 26a to 26d rotate, but in this case, the downstream feed roll 26C22
The feed roll 26a on the upstream side is higher than the feed speed of 6d.
, 26b are set so that the delivery speed is higher than the rotational speed, so the front end of the workpiece 1 located on the upstream side always comes into contact with the rear end of the workpiece l located on the downstream side.
This is urged in the transfer direction (arrow A direction). For this reason,
The work l is always stably transferred regardless of its length. Also, the work l is connected to the feed roll 26a and the 2
6b, and the feed roll 26
Regarding the position P held between c and 26d, the guide plate 27, which is rotatably provided in place of the guide parts 24a, 24b, and 24c, guides the seam part 1a of the work l, so that the work 1 is moved between the feed rolls 26a and 26d. 26d and the seam portion 1a is narrowed, the guide plate 27 rotates while abutting the seam portion 1a,
As a result, stable transfer of the workpiece 1 is not hindered.

Thereafter, the workpiece I has a seam portion 1a that is connected to the seam guide 2.
4b to the welding position Y, and when it reaches this welding position Y and at the point f, it is squeezed from the outer circumferential direction by squeeze rolls 3Ia to 31d, and the seam IE Ia is butted, and in this state, the welding torch 30 Welding of the seam portion 1a is performed in this manner. The work l whose seam portion 1a has been welded in this way is further urged in the transfer direction by the work 1 on the upstream side, and the mandrel 2
3 from the terminal end 23b. Through the above operations, pipes with short length dimensions are continuously manufactured.

"Effects of the Invention" As explained above, according to the present invention, a plurality of workpieces supported by a mandrel are fed out in a sandwiched state, and the feeding speed on the upstream side is higher than the feeding speed on the downstream side. At least two pairs of feed rolls are provided, each with a rotating speed set such that Therefore, regardless of the length of the work, the work can be transferred stably.This makes it possible to continuously manufacture pipes with shorter length than before. Be able to respond immediately even if changes occur. Further, among the seam guides that guide the seam portion of the workpiece supported by the mandrel to the welding position where the workpiece is welded by the welding torch, at least a portion corresponding to a portion where the workpiece is held by the feed rolls is rotatable. Since it is constructed with a disc-shaped guide plate provided, even when the workpiece is held between the feed rollers and the seam part is narrowed, the guide plate rotates while contacting the seam part, thereby stabilizing the workpiece. The effect is that the transfer of the data is not hindered.

[Brief explanation of the drawing]

Figures 1 (a), (b), and (c) are a plan view, front view, and side view showing the configuration of an embodiment of the present invention, and Figure 2 (
A) and (B) are a plan view and a front view showing the configuration of the main parts of the same embodiment, FIG. ) and (b) are a plan view and a front view showing the configuration of a conventional short pipe continuous welding device. 1... Work, la... Seam part, 23
・・・・・・Mandrel, 24 a, 24 b, 24
c...Guide part, 26a-26d...Feed roll, 27...Guide plate, 27a...
・Axis, G...Seam guide, 300. ...Welding torch, 31a-31d...Squeeze roll.

Claims (1)

[Claims] The short pipe continuous welding equipment continuously manufactures short pipes by forming metal plates cut to predetermined dimensions into cylindrical shapes and welding the seams of this cylindrical workpiece with a welding torch. A mandrel that supports the cylindrical workpiece so as to be movable in the feeding direction, and a plurality of works supported by the mandrel are fed out in a sandwiched state, and the feeding speed on the upstream side is higher than the feeding speed on the downstream side. at least two or more pairs of feed rolls each having a rotational speed set such that the rotational speed is high; a seam guide that guides the seam portion of the workpiece supported by the mandrel to a welding position where it will be welded by the welding torch;
a squeeze roll that tightens the workpiece that has reached the welding position from the outer circumferential direction to butt the seam portions, and at least a portion of the seam guide that corresponds to a portion where the workpiece is held between the feed rolls. 1. A short pipe continuous welding device characterized by comprising a disc-shaped guide plate that is rotatably provided.