JPS58176073A - Rotary arc welding device - Google Patents

Abstract

PURPOSE:To obtain a rotary arc welding device which executes electrification exactly and is capable of welding a groove smoothly, by providing a power receiving plate and a power feeding plate on the upper part of a rotary nozzle, and pressing a carbon brush of the power feeding plate against the power receiving plate by an elastic body fit-inserted to a guide rod or the like. CONSTITUTION:A power receiving plate 11 having a wire insert-through hole, and a power feeding plate 13 stuck to the upper face of a carbon brush 12 are fixed to the upper part of a rotary nozzle 3 rotated by a motor 2. The carbon brush 12 of the power feeding plate 13 is pressed against the power receiving plate 11 by installing a wire inlet 4 to a supporting arm 19 extended out from the device body and fit-inserting an elastic body 16 of a spring, etc. to a guide rod 15 vertically provided on the supporting arm 19. A welding wire 8 is fed to the rotary nozzle 3 through the wire inlet 4 by a wire feeding device 7. A shielding gas nozzle 6 is provided on both sides of the rotary nozzle 3, and is opened toward the tip of the nozzle 3. According to this mechanism, even in case when the groove is narrow, the nozzle tip can be contained in the groove.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating arc welding device that performs welding by horizontally rotating an arc at high speed.

Previously, the present applicant proposed a welding method that can weld objects to be welded at high speed and with a large current, has a low welding heat input to the welded part, and has uniform penetration of the molten metal and does not cause welding defects. Developed a high-speed rotating arc welding method and filed a patent application (Japanese Patent Application No. 79618/1983).

According to this method, there are no material defects in the weld heat-affected zone around the welded part, and the molten metal in the welded part is evenly penetrated, resulting in partial deep penetration. Highly efficient welding can be performed without causing cracks or the like. However, in actual welding work, the nozzle rotates horizontally at high speed at a rotation frequency of 2 to 100 Hz, so there was a problem with the mechanism for supplying electricity to the nozzle from the welding power source. In other words, considering the loss of current flowing to the nozzle, it is desirable to carry out the welding near the tip, but in the case of narrow gap welding, if a current supply mechanism is provided near the tip, the nozzle may be housed within the groove. Moreover, even if it can be accommodated within the groove, the current supply mechanism is easily damaged by welding spatter and arc heat.

From the above-mentioned viewpoints, the present invention has been developed to provide a rotating system that allows the nozzle tip to be accommodated within the groove even in the case of a narrow gap, and that allows the nozzle to be reliably energized and performs smooth welding in high-speed rotating arc welding. An arc welding device comprising: a vertically oriented rotary nozzle having a tip having a wire feed port eccentrically outwardly from the axis; A power receiving plate having a wire insertion hole in the center, a carbon brush whose lower surface is in sliding contact with the upper surface of the power receiving plate, a power feeding plate fixed to the upper surface of the carbon plan, and a lower portion thereof passing through the power feeding plate and the carbon brush. A wire inlet having a wire insertion hole in the center is attached to a support arm extending from the main body of the device, facing the upper surface of the wire insertion hole of the power receiving plate, and a lower part of the wire inlet, which is vertically disposed on the support arm, is connected to the power supply. a guide rod that fits into a guide hole provided in the plate and the carbon brush; an elastic body that is fitted around the outer periphery of the guide rod and that presses the carbon brush to which the power supply plate is attached to the power receiving plate; a wire feeding device for feeding the welding wire to the rotating nozzle via the wire inlet; and a pair of shield gases provided on both sides of the rotating nozzle with their opening surfaces facing the tip of the rotating nozzle. It is characterized by consisting of a nozzle and a hole.

Next, the present invention will be explained with reference to examples and drawings.

FIG. 1 is a schematic front view of a rotating arc welding device of the present invention;
FIG. 2 is an enlarged vertical cross-sectional view of the main part of the current-carrying part.

In the drawings, 1 is a gear box attached to a frame of a welding device (not shown), 2 is a motor provided on the gear pidges 1, and 3 is a gear connected to the motor 2 via a gear (not shown) in the gear box 1. a vertically oriented rotary nozzle that rotates horizontally, 4 a wire inlet provided in the soil surface of a support 19 on which a gear is attached to the upper surface of the Tux 1;
5 is a shield gas nozzle base attached to the lower surface of the gear box 1; 6, 6 is a pair of shield gas nozzles provided on both sides of the lower surface of the base 5 so as to sandwich the rotary nozzle 3; is directed towards the tip of the The rotating nozzle 3 penetrates the gearbox 1 and the shield gas nozzle base 5 via an insulator (not shown). Reference numeral 7 denotes a wire feeding device for feeding the welding wire 8 into the rotating nozzle 3 by means of rollers 9, 9' and a motor 10.

As shown in FIG. 1 and FIG. 3 (A), (B), and (C), the rotating nozzle 3 has a small diameter part 3' at its lower part, and a tip 3'' at the tip of the small diameter part 3'. It is removably attached, and there is a wire insertion hole 3a 7 at the axis of the rotation/slew 3.
5E, and the wire insertion hole 3b of the chip 3' is eccentric outward from the axis.

A wire 8 is fed into the wire insertion holes 3a, 3b by a wire feeding device 7, and a tip of the wire 8 protruding from the tip 3# is fed by a rotary nozzle 3 whose motor 2 and gears are rotated by a gear 1. The portion 8' rotates horizontally in an arc. Note that the diameter of the arc can be arbitrarily changed by preparing various steps 3'' having wire feeding holes with different degrees of eccentricity.

11 is a power receiving plate fixed to the upper part of the rotary nozzle 3 for supplying power to the rotary nozzle 3, and a wire feeding hole 1 is provided in the center of the power receiving plate.
1a is provided and rotates integrally with the rotating nozzle 3.

12 is a carbon plastic that slides into contact with the upper surface of the power receiving plate 11;
A power supply plate 13 is placed on the soil surface of the carbon brush 12.
It is fixed by 4.

A support arm 19 extends upward from the gear box 1 on the apparatus main body side, and the support arm 19 is provided with a wire inlet 4 having a wire insertion hole 4' in the center.

The lower part of the wire inlet 4 passes through the power supply plate 13 and the carbon brush 12 and faces the upper end of the wire feed hole 11a of the power receiving plate 11.

Reference numeral 15 indicates a plurality of guide rods (9, only one of which is shown in an enlarged view in FIG. , is fitted into the car brush 120 guide hole 12a.

On the outer periphery of the guide rod 15, there is a spring f for pressing the carbon brush 12 to which the power supply plate 13 is attached to the power receiving plate 11.
An elastic body 16 such as an IJ ring is fitted. This guide rod 15 connects the carbon brush 12 to the power receiving plate 1 as described above.
1, the carbon brush 12 presses the power receiving plate 11.
It also has a detent effect to prevent it from rotating.

Reference numeral 18 denotes a power supply cable terminal attachment hole for attaching the power supply cable 17 to the power supply plate 13.

Reference numeral 20 denotes a detector for detecting the position of the tip of the wire 8, and is used for arc sensor control when positioning the axis of the rotary nozzle 3 to the center line of the bevel.

Since this invention is constructed as described above, even when performing narrow gap welding using a rotating nozzle, there will be no problem because the power supply part is located at the top, and the power supply part will not be affected by welding spouts, ivy, or arc heat. Since the power feeding part has a sliding structure between the carbon brush and the power receiving part, it provides excellent industrial effects such as accurate energization of the rotating nozzle that rotates at high speed. It will be done.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of the device of the present invention, Fig. 2 is an enlarged vertical sectional view of the main part of the current-carrying part, and Fig. 3 (a), (b), and C are enlarged sectional views showing the tip of the rotating nozzle. . In the drawing, ■... Gear is Tsukusu, 2... Motor, 3... Rotating nozzle, 4... Wire inlet, 5... Shield gas nozzle base, 6, 6... Shield gas nozzle,
7... Wire feeding device, 8... Welding wire, 9,9
'... Roller, 10... Motor, 11... Power receiving plate, 12... Carbon brush, 13... Power feeding plate, 14
... Bolt, 15... Guide rod, 16... Spring, 17... Power supply cable, 18... Cable terminal mounting hole, 19... Support arm, 20... Detector. Applicant Nippon Kokan Co., Ltd. Agent Keita Tsutsumi 1 other horse 3 illustrations

Claims (1)

[Claims] a vertically oriented rotating nozzle having a tip attached to its tip having a wire feed port eccentrically outward from the axis; and a power receiving plate fixed to the top of the rotating nozzle and having a wire insertion hole at its center. a carbon brush whose lower surface is in sliding contact with the upper surface of the power receiving plate; a power feeding plate fixed to the upper surface of the carbon brush; and a lower part of the carbon brush passing through the power feeding plate and the carbon brush. A wire inlet having a wire insertion hole in the center is attached to a support arm extending from the device main body facing the soil surface of the hole, and a lower part of the wire inlet, which is vertically disposed on the support arm, is provided on the power supply plate and the carbine brush. a guide rod that fits into the guide hole;
an elastic body fitted around the outer periphery of the guide rod for pressing the carbine brush to which the power supply plate is attached to the power receiving plate; and a wire for feeding the welding wire to the rotating nozzle via the wire inlet. A rotary arc welding device comprising: a feeding device; and a pair of shield gas nozzles provided on both sides of the rotary nozzle with their opening surfaces directed toward the tips of the rotary nozzles.