JPS5913945B2 - welding torch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding torch for TIG welding.

Generally, in TIG welding, when an electrode wears out, it is removed from the torch body, its tip is ground, and then set again, or a new electrode is set in the torch body.

Therefore, TIG welding operations using short-lived electrodes have been extremely inefficient, as the electrodes must often be ground or replaced manually with new electrodes. In particular, when performing TIG welding with a high operating rate using dedicated welding equipment in which materials to be welded are continuously fed, it is necessary to operate the equipment to perform the above-mentioned electrode grinding or electrode replacement work. It is necessary to temporarily stop operation. This kind of thing seriously impedes the flow of work,
Undesirable. In addition, conventional automatic electrode replacement torches only feed the electrodes into the torch and do not have a function to recover the exhausted electrodes, so when 10 electrodes are ejected, an extra device is required to receive the electrodes, and the material to be welded or the special It was not satisfactory for use in dedicated welding equipment because it interfered with welding equipment and the like. In view of these points, the present invention has been developed to replace an electrode that has been consumed by welding with a new electrode during a temporary arc stoppage, so that normal welding can always be performed.
The present invention provides an IG welding torch.

Hereinafter, a welding torch according to the present invention will be explained using the drawings of FIGS. 1 to 5. 20 FIG. 1 shows an electrode block used in the welding torch of the present invention. This electrode block 1 holds an electrode 2, and when a collet chuck Ib is pushed into a collet body 1a with a screw Ic, a collet chuck is formed. The tapered tip 25 surface of Ib is pressed against the tapered inner surface of the collet body 1a, and the inner diameter hole of the collet chuck Ib contracts, whereby the electrode 2 is held.

Id is an O-ring inserted into the collet body 1a. 2 to 5 show a welding torch 30 according to an embodiment of the present invention, and in the figures, 3 is a rotating drum, and this rotating drum 3 has a loading hole into which the electrode block 1 is loaded. A plurality of insulating tubes 4 having 4a are arranged concentrically and fitted together, and an insulating nozzle 535 is screwed into the tip of the insulating tube 4, and the nozzle 5 and the electrode block 1 A wire mesh block 6, in which a wire mesh 6a is fixed by caulking, is screwed and disposed between the wire mesh block 6 and the wire mesh block 6. Further, the tip of the electrode 2 of the 1A=-electrode block 1 protrudes from the nozzle 5.

Reference numeral 7 designates a rotating shaft to which the rotating drum 3 is fixed by a bolt 8. Therefore, the thrust direction is fixed.

13 is a gear fixed to this rotating shaft 7 with a screw 14. This gear 13 meshes with a gear 16 fixed to the rotating shaft of a motor 15, and the rotational force of the motor 15 is transferred to the gear 1.
6. It is transmitted to the rotating shaft 7 via the gear 13.

Here, a plurality of limit switch dogs 17 are fixed to the upper surface of the rotating drum 3 for rotationally transferring a plurality of electrode blocks 1 by one pitch. Therefore, the main body 18
Then, a limit switch 20 attached via the arm 19 is operated, whereby a stop signal is sent from a control device (not shown) to the motor 15, and the rotation of the rotating drum 3 is stopped at a predetermined rotation angle. Further, the motor 15 is fixed to the main body 18 with bolts 21. Reference numeral 22 denotes a reciprocating power supply block disposed on the same axis as one of the plurality of electrode book blocks 1 loaded on the rotating drum 3 and slidably on this axis. The end surface of the power supply block 22 into which the electrode block 1 is fitted has a tapered shape, so that the indexing stop position of the rotating drum 3 can be accurately positioned, and the power supply to the electrode block 1 can be performed satisfactorily. It will be done.

Further, an arm 26 is attached to the rear end of the power supply block 22 by tightening it with a nut 25, which is sandwiched between an insulating tube 23 fixed to the power supply block 22 and an insulating washer 24.
is attached, and the other end of this arm 26 is connected to a rod 28 of an electromagnet 27 by a pin 29. Furthermore, this power supply block 22 has an insulating spring holder 30.
A spring 31 is disposed between the spring receiver 30 and the outer periphery of the power supply block 22 and has both ends in contact with the spring receiver 30 and the insulating cylinder 23. Therefore, the power supply block 22 is biased in a direction away from the electrode block 1. That is, when the electromagnet 27 is not energized during rotation of the rotating drum 3, the power supply block 22 is separated by the spring 31 to a position where it does not interfere with the electrode block 1, and by energizing the electromagnet 27, the power supply block 22 is removed. slides against the repulsive force of the spring 31 and comes into contact with the electrode block 1 under pressure. Reference numeral 32 denotes a terminal to which power is supplied from a welding machine (not shown), and this terminal 32 is attached to the rear end of the power supply block 22 with a nut 33.

34 is a shielding gas supply pipe fixed to the flange 9 while being inserted into the rotating shaft 7 in the axial direction;
The shielding gas supplied to this supply pipe 34 is supplied to the blind hole 35, the through holes 36, 37, 38, the annular groove 39, the through hole 4
0, the gas is supplied to the nozzle 5 through the gas chamber 41, the through hole 42, and the wire mesh 6a, and is sprayed onto the welding part.

43, 44, and 45 are O-rings that prevent shielding gas from leaking.

46 is a hexagonal bolt for attaching to a special welding device, and an insulating plate 47 and an insulating tube (
(not shown) and is insulated by an insulating washer 48.

Next, the operation of the welding torch of the present invention having the above configuration will be explained.

First, in the torch of the present invention, a plurality of electrode blocks 1 shown in FIG. 1 are loaded into the loading hole 4a of the rotating drum 3.

If you wish to perform welding work in this state, as shown in FIG. 4, energize the electromagnet 27, lower the power supply block 22, and bring the tip into pressure contact with the rear end of the electrode block 1. Often, welding work can be performed by supplying the contact output from a welding machine to the electrode block 1 via the power supply block 22.

Further, at this time, shielding gas is being sent from the supply pipe 34, and the shielding gas is injected to the welding part only from the nozzle 6 in the part where the electrode block 1 that is in contact with the power supply block 22 is loaded. Next, when you want to replace the worn out electrode 2, as shown in FIG.
The power supply to the motor 15 is stopped, the power supply block 22 is separated from the electrode block 1 by the spring 31, and the motor 15
All you have to do is apply electricity to rotate the rotating drum 3 by an amount corresponding to one pitch of the electrode block 1, and then apply electricity to the electromagnet 27 again to lower the power feeding block 22. This will remove the worn out electrode and the new one. Electrodes can be replaced.

As described above, in the heavy welding torch of the present invention, a worn out electrode can be replaced with a new electrode automatically and without human intervention, and moreover, it is possible to reliably replace a worn out electrode with a new electrode during operation of a fully automatic welding machine.

Note that in the present invention, the means for rotating the rotating drum 3 is not limited to the motor 15;
Other driving sources such as an air cylinder may also be used.

Also, as a means for reciprocating the power supply block 22,
The present invention is not limited to the above embodiments, and other driving sources such as an air cylinder or a motor may be used. As described above, the welding torch of the present invention can automatically replace a worn-out electrode with a new one without human intervention, and moreover, can reliably replace a fully automatic welding machine with a new one, thereby preventing welding defects caused by defective electrodes. This is an extremely excellent method in that it eliminates the occurrence of welding and allows welding to be performed at a high operating rate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an electrode block used in a welding torch of the present invention, FIG. 2 is a front view showing the appearance of a welding torch according to an embodiment of the present invention, FIG. 3 is a top view, and FIG.
5 and 5 are cross-sectional views showing the internal structure of the torch, respectively. 1... Electrode block, 2... Electrode, 3
...... Rotating drum, 4... Insulating tube, 7.
... Rotating shaft, 13, 16 ... Gear, 15
...Motor, 17...Dog for limit switch, 20...Limit switch, 22.
...Power supply block, 27...Electromagnet, 3
1... Spring.

Claims (1)

[Claims] 1. A rotating drum in which a plurality of electrode blocks with electrodes sandwiched therein are loaded so as to be electrically insulated from each other, and which rotates so as to feed the electrode blocks by one pitch, and a plurality of electrode blocks loaded on this rotating drum. The power supply block is located on the same axis as one of the electrode blocks and reciprocates on the same axis to contact the electrode block as necessary, and automatically replaces a worn-out electrode with a new one. A welding torch characterized in that it is configured to be replaced.