JPS61123476A - Periphery welding device - Google Patents

Abstract

PURPOSE:To execute a periphery welding even in case of a curved pipe, and also, to cope easily and correctly with a change of a pipe diameter and an arc length by constituting a titled device so that an eccentric quantity of a torch installed parallel shaft eccentric ring supported by a rotary ring for using the center of a body to be welded, as a revolving shaft can be controlled. CONSTITUTION:A rotary ring 31 which has been aligned centering around a body to be welded 22 by a centering pin 26 is rotated by a motor 29. An eccentric ring 32 rotated centering around a tip electrode 28 of a torch 27 is supported by a guide 41 and its eccentricity can be controlled as to its movement by a handle 44. Even in case of a curved pipe 22, its peripheral welding can be executed by executing the peripheral welding by a rotation of the rotary ring 31, and changing a direction of the torch 27 by a rotation of the eccentric ring 32, but on the other hand, a change of the pipe diameter 22 and a control of an arc length are executed simply and easily by controlling the eccentricity, and an application range of a device is expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a circumferential welding device for welding along the outer periphery of a welded object.

(Prior Art) The present invention has previously been disclosed in Japanese Patent Application No. 168188/1988. In this invention, the torch 27 is supported by a torch holder 34 on a II core ring 32, and this eccentric ring 32
It is rotatably supported inside by a bearing B2. By rotating the rotary ring 31 with the motor 29, the outer periphery of the joint pipe 22 can be welded with the torch 27.

Here, a structure in which an eccentric ring 32 is rotatably provided inside a rotating ring 31 and a torch 27 is attached to this eccentric ring 32 via a torch holder 34 will be explained.
First, the eccentric ring 32 can rotate around C2. A torch 27 is attached to this eccentric ring 32, and the tip of the torch 27 is directed toward C2. Therefore, even if the eccentric ring 32 rotates, the tip of the torch 27 is always located at the center C2.

Next, the rotating ring 31 can rotate with C1 as the center of rotation. On the other hand, in the center ring 32, when the C1 rotation ring 31 supported inside the rotation ring 31 rotates, the eccentric ring 32 also rotates accordingly. During this rotation, since the center C2 is at a distance of d/2+G from the center C1, the rotating ring 3
If 1 is a rotational dimension, the center C2 can move in a circular arc shape with a radius of d/2+G. (In other words, it moves on the trajectory shown in FIG. Even in a certain rotational position, the electrode joint vibrator 22 can be welded by the electrode 28 by rotating the rotary ring 31 once.

By the way, to explain why the above invention has such a structure, the torch 27 shown in FIG. ing. However, since the joint pipe 22 is L-shaped,
Even if the pipe 27 attempts to rotate once, the horizontal portion of the joint pipe 22 may get in the way, causing a problem that welding may not be possible.

However, since the torch 27 is provided to be rotatable around C2, even if the torch 27 and joint pipe 22 come into contact, the torch 27 can escape within the range of rotation around C2. For this reason, torch 2
7 can continue welding while rotating in a direction that is not hindered by the joint pipe 22. (Even if the torch 27 rotates around 02, the Since the tip is always located above the trajectory, the rotation of the torch 27 has no effect on welding.) The above is the configuration and operation of the previous invention.

(Problems to be Solved by the Invention) By the way, in FIG. 3, the rotating boss 24 and the eccentric ring 3
The eccentricity with respect to 2 is the joint pipe 2 which is the material to be welded.
The radius d/2 of 2 and the distance from the tip of the electrode 28 to the joint pipe 22 which is the material to be welded! Determined by IG. Therefore, if the diameter of the joint pipe 22 is different, in order to obtain an appropriate amount of eccentricity, the rotary ring 31 must be
There is also a problem in that it is necessary to manufacture the eccentric ring 32. Furthermore, the arc length G, which is one of the welding conditions, must be determined experimentally, but even during this experiment, the arc 1% G cannot be freely varied.
It was very inconvenient.

(Means for Solving the Problems) Therefore, in the present invention, in order to solve the above problems, the eccentric ring is configured to be movable and adjustable inside the rotary ring, so that the rotary boss 24 and the eccentric ring 30 can be moved and adjusted. It is characterized by having a configuration in which the amount of eccentricity between the two and the center can be freely adjusted.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

First, reference numeral 23 denotes a moving device that can move the rotary boss 24 in the X, Y, and Z directions shown in the figure.

The rotation boss 24 has an insertion hole formed with a predetermined radius around C1. A bush 25 for holding the centering bin 26 is provided on the inner peripheral surface of this insertion hole. In this example, the bushing 25 is composed of a metal bushing, a linear ball bushing, or the like so that the centering pin 26 can be moved up and down relative to the rotary boss 24 smoothly and without play.

Next, a circular support portion 24a is integrally formed at the lower part of the rotary boss 24. A rotating ring 31 formed in a substantially ring shape is rotatably attached to the outer periphery of the support portion 24a via a bearing B1.

A gear A731a is formed on the side circumferential surface of the rotating ring 31, and this gear 31a meshes with a gear 30 of the motor 29 so as to be rotated by the motor 29.

Next, a bearing holder 4 is placed at the bottom of the rotating ring 31.
5 is provided. Here, to explain in detail the relationship between this bearing holder 45 and the rotating ring 31, there is a lower part of the rotating ring 31 as shown in FIG. A substantially C-shaped guide 41 is integrally formed. Slide support portions 41a each having an oval-shaped cross section are formed inside the guide 41 (upper and lower portions in FIG. 2).

On the other hand, a bearing holder 45 is set in the slide support portion 11a so as to be movable forward and backward (in FIG. 2, movable in the horizontal direction in the figure). This bearing holder 45
rotatably supports an eccentric ring 32 therein via a bearing B2, and a torch holder 34 is attached to the eccentric ring 32.

On the other hand, a screw hole 4 is provided on the left side of the bearing holder 45 in the figure.
5a are provided in the radial direction. In addition, the guide 4
A square support protrusion 41b is formed to protrude from the left end of 1 in the drawing. An adjustment screw 44 is rotatably supported by this support protrusion 41b. (However, this adjustment screw 44 is rotatably provided with limited movement in the horizontal direction in the drawing.) A screw 44a is attached to the tip of the adjustment screw 44 (on the right side in FIG. 2). The screw 44a is screwed into the screw hole 45a. Therefore, by rotationally adjusting the adjustment screw 44, the bearing holder 45 can be adjusted to the slide support portion 4.
While being supported along line 1a, it is possible to adjust the movement in the left and right directions in the drawing.

In addition, 33 is a bearing holder 45 and an eccentric ring 32.
This spring is provided between the eccentric ring 32 and the eccentric ring 32 to prevent the eccentric ring 32 from rotating inadvertently.

Next, the action and effect will be explained. First, the centering pin 26 is inserted into the bush 25 during welding. This centering pin 26 has the same diameter as the joint pipe 22 that serves as a counterweight for welding, and 1) γ setting of the tip position of the electrode 28 is performed using this centering pin 26 as a reference. ing.

That is, once the centering pin 26 is inserted, the distance G between the electrode 28 and the centering pin 26 is measured. If this distance 11G is not appropriate, perform the following operation.

First, the adjustment screw 44 is rotated while looking at the tip of the electrode 28. Then, since the bearing holder 45 can be moved to either the left or right direction in the figure, the distance G between the electrode 28 and the centering pin 26 is adjusted by adjusting the rotation of the adjustment screw 44.

When this distance reaches the required length, the centering pin 26 is pulled upward and welding is started. Then, the rotary boss 24 is first moved downward in the figure to a predetermined height by the moving device 23, and then the motor 2
Welding is performed at the same time as rotation of the rotary ring 31 is started by 9. ” If the distance G between the electrode 28 and the centering pin 26 is still inappropriate, repeat the above operation again to adjust the distance between the electrode 28 and the centering pin 26. .

In this way, in this example, the distance G between the electrode 28 and the joint pipe 22, which is the material to be welded, can be freely adjusted. Therefore, the joint to be welded material! Even if it is desired to change the diameter of 22 or the arc length G, this can be easily done by simply adjusting the rotation of the adjustment screw 44 without having to manufacture a new welding device.

(Effects of the Invention) As explained above, in the present invention, with the structure described in the claims, even when the diameter of the pipe of the material to be welded or the arc length needs to be changed, It has an extremely favorable feature that it can be handled very simply by simply adjusting the movement of the eccentric ring.

[Brief explanation of the drawing]

Figures 1 and 2 show one embodiment of the present invention.
The figure is a partially cutaway side view showing the overall configuration of this embodiment.
The figure is a bottom view showing the guide, bearing holder, eccentric ring, and adjustment screw as seen from below;
The figure is a partially cutaway side view showing a conventional example, and FIG. 4 is an explanatory diagram mainly showing the relationship between the rotary ring, the eccentric ring, and the torch. 21... Container body 22... Joint pipe 23... Moving device 24... Rotating boss 25... Bush 26... Renting bin 27... Torch 28... Two electrodes ... Motor 30 ... Gear 31 ... Rotating ring 3ia ... Gear 32 ... Eccentric ring 33 ... Spring 34 ... Torch holder 41 ... Guide 41a ... Slide support part 41b ... Support protrusion 44 ... Adjustment screw 44a ... Screw 45 ... Bearing holder 45a ... Screw hole

Claims (1)

[Claims] A rotary ring that rotates around the center of the object to be welded, and an eccentric ring that has a center at a position different from the center of the rotary ring and is rotatably supported within a radius of the rotary ring, Furthermore, a circumferential welding device for welding the outer periphery of a workpiece of a type in which a torch is fixed to the eccentric ring, wherein the eccentric ring moves in a radial direction inside the rotating ring. A circumferential welding device characterized in that it is configured to be adjustable.