JPS5849190Y2 - Workpiece support device in seam welding machine - Google Patents

Description

[Detailed explanation of the invention] This invention consists of fitting flanged out airtight lid plates to both opening edges of the body, which is rolled from a flat plate into a cylindrical shape, and continuously seam-welding the overlapping flanges. This invention relates to a machine for manufacturing airtight cylindrical containers, and in particular to a workpiece support device useful for automatic seam welding of lid plates that have caps or other protrusions that protrude outward from the container. .

Conventionally, when a cover plate having a base or other protrusions is airtightly welded to both opening edges of the body, if the cover plate has the above-mentioned protrusions, the welding electrode may be subjected to force. 1 for putting in and taking out
Not only does this occur, but during welding, the protrusions come into contact with the electrode, often resulting in accidents such as the workpiece tilting significantly and the flange coming off the electrode.

In this case, normally, one flange is held between the upper and lower roller electrodes and pressure is applied, and the flange on the other side is welded by the operator supporting the flange with his/her hand while tilting the workpiece toward the electrode. Although it was a common task, it was also a task that required long experience and great skill.

In addition, it is extremely difficult to weld the rising edge of the 7-lunge of this type of cover plate, that is, the 7-lunge at a deep location, by always correctly and automatically guiding the welding between the electrodes.

This invention solves the above-mentioned drawbacks, and actually makes automation possible, allowing anyone to weld easily, safely and accurately, and also makes it possible to weld the seam at the edge of the flange of the cover plate. A workpiece support device for a seam welding machine is provided.

This invention will be explained below based on the embodiments shown in the drawings.

In Figures 1, 2, and 3, 1 is a large-diameter upper roller electrode that moves up and down with a pressure cylinder of a seam welding machine (not shown), and 2 is a small-diameter upper roller electrode that is coaxial with the upper roller electrode. The lower roller electrode, 3, is a workpiece that constitutes an airtight container;
A cylindrical body 4, and a mating lid plate 5 that is assembled by seam welding to both side opening edges 4a and 4b of this body, respectively.
It consists of 5.

This cover plate has a flange 6 on its periphery, and an outwardly projecting base 7 is welded to the plate surface.

Reference numeral 8 denotes a support stand for supporting the workpiece 3 on the rollers 22 and 23; A rotation holding device 9 is provided to support and stabilize the rotation axis of the workpiece, and this holding device has a cylinder 11 fixed to a bearing bracket 10 fixed to the rear of the support base.
(7) The piston rod 12 of the 7 cylinder is slidably supported by the bearing 13 of the bracket, and the rotatable holding plate 14, which is swingably attached to the tip of the rod, controls the operation of the cylinder 11. The structure allows the workpiece to be pressed toward the electrode with an appropriate force.

On the other hand, the front part of the support base is rotatably supported around a fixed shaft 17 of a support member 16 fixed on the base 15, and the rear part of the support base is supported by an elevator fixed on the base. It is rotatably connected to the piston rod 19 of the cylinder 18 via a connecting shaft 20.

Therefore, the support stand with such a configuration can be tilted within an angle of 10° to 25° so that the rear part is high and the front part is low with respect to the horizontal plane, and the object 3 on the support stand is always Natural gravity is used to hold the weld on the electrode side, so that the welding trajectory at the rising edge of the flange does not deviate from the electrode pressurization point.

Reference numeral 21 denotes a stopper fixed to the tip of the support base, which abuts against the open end of the workpiece and supports part of the weight of the workpiece.

Next, the operation of this invention will be explained.

After fitting the mating lid plates 5, 5 to the opening edges 4a, 4b of the body 4, the workpiece 3 is placed on the support base 8 by the rollers 22,
23, one flange is inserted between the open upper and lower electrodes and brought into contact with the stopper 21 of the support base 8, and the rear part of the body is placed on the rotary holding plate 14 of the holding device 9 to operate the cylinder 11. The cover plate 5 is pressed against the electrode direction to set it in a weldable state.

After setting the workpiece on the support stand, the workpiece is held between the upper and lower roller electrodes 1 and 2, and at the same time, a current necessary for resistance heating is passed between these electrodes to rotate the roller electrodes 1 and 2. The workpiece 3 is driven to roll over on the support table by the driving force, and the flange is guided and passed between the upper and lower electrodes to be seam welded.

After the welding is completed, the upper and lower roller electrodes 1 and 2 and the rotation holding device 9 are opened, and the tilted support table 8 is returned to the position 1 shown by the imaginary line by the operation of the lifting cylinder 18 to a horizontal position.

During the period when the support table is lowered, the welded workpiece can be taken out using an ejector or the like and sent to the next process.

Note that the electrode surfaces of the upper and lower roller electrodes have slopes that are approximately parallel to the inclination angle of the workpiece, so that an average pressing force is applied to the flanges inserted from the direction of inclination with respect to the electrode axis. be.

In addition, during welding, the holding plate 14 of the rotation holding device 9 can follow the rotation and movement of the workpiece, so even if there are various variations in the rotational movement, the rotation axis of the workpiece can be maintained in a well-balanced manner. The welding motion of the flange passing between the upper and lower roller electrodes can be accurately guided.

As explained above, according to this invention, when manufacturing airtight cylindrical containers, it is possible to weld the seam at the edge of the flange, especially when there are caps or protrusions on the other lid plate. Welding can be performed automatically and accurately without bothering the operator, significantly improving workability and safety, and drastically reducing the number of defective products.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the workpiece support device according to this invention. FIG. 2 is a side view of this device. FIG. 3 is a view taken along the line A--A in FIG. 1.2...Pair of upper and lower roller electrodes, 8...
...Support stand, 9...Rotation holding device.

Claims (1)

[Claims for Utility Model Registration] 1. A device for seam welding by rotationally driving a workpiece while pressing the workpiece between a pair of upper and lower roller electrodes and applying electricity to the workpiece, which supports almost the entire weight of the workpiece. It has a support stand and a rotation holding device that supports a rotating shaft of the workpiece driven by the driving force of the electrode, and the support stand is configured to be tiltable so as to be lower in the direction of the electrode with respect to the horizontal plane. A workpiece support device for a seam welding machine, characterized in that: 2. In the device set forth in claim 1 of the utility model registration claim, the holding device is constituted by a rotatable holding plate attached to the piston rond of the cylinder fixed to the rear of the support base so as to be able to swing freely. A workpiece support device 3 in a seam welding machine, characterized in that the device according to claim 1 or 2, wherein the electrode surfaces of the pair of roller electrodes are aligned with the inclined axis of the workpiece. A workpiece support device for a seam welding machine, characterized in that it is formed with a slope that is substantially parallel to the surface of the workpiece.