JPH0442063Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a welding wire feeding device that pulls out welding wire from a wire reel and feeds it to a torch, and in particular removes foreign matter such as dust attached to the welding wire. The present invention relates to a welding wire feeding device equipped with a filter.

(Prior Art) A carbon dioxide gas arc welding machine is normally used as a welding device for parts of a car body where point welding is impossible due to the structure. Carbon dioxide gas arc welding machineAs is well known, the welding wire wound around a wire reel is pulled out by the feed roll of the welding wire feeder, and the pulled out welding wire is passed through the conduit tube together with carbon dioxide gas at a constant speed. Welding is carried out in carbon dioxide gas while flowing carbon dioxide gas from a nozzle to the parts of the base material to be welded.

(Problems to be Solved by the Invention) By the way, the welding wire used in the carbon dioxide gas welding machine is a bare wire, and the welding wire is wound around a wire reel as it is. For this reason, dust and spatters from the factory tend to adhere to the surface of the welding wire, and when these adhering chips and spatters are drawn into the conduit tube together with the welding wire, the conduit tube becomes clogged and the welding wire There is a problem in that it becomes difficult to feed the welding wire, and in some cases, it becomes impossible to feed the welding wire to the torch.

The present invention has been developed in view of the above-mentioned points, and is a welding wire feeding device that removes foreign matter such as dust and spatters attached to the welding wire and facilitates the insertion of the welding wire into the conduit tube. The purpose is to provide

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a welding wire feeder in which a welding wire wound around a wire reel is drawn out and passed through a conduit tube to be fed to a torch. The housing of the feeding device is provided with a filter for removing foreign matter attached to the welding wire when the welding wire is inserted into the conduit tube at a position in front of the welding wire introduction port of the conduit tube. .

(Function) The welding wire wound around the wire reel is pulled out from the feed roll of the welding wire feeder,
The drawn-out welding wire is passed through a filter to remove foreign matter such as dust attached to the surface. The welding wire, from which foreign matter has been removed by the filter, is introduced into the conduit tube, transported within the conduit tube, and fed to the torch.

(Example) An example of the present invention will be described below in detail based on the accompanying drawings.

Fig. 1 shows a carbon dioxide arc welding device equipped with a welding wire feeding device to which the present invention is applied. A regulator 4 that adjusts the amount of gas outflow, a welding wire feeding device 5, and a conduit whose one end is connected to the welding wire feeding device 5 and the other end is connected to the torch 6 to feed the carbon dioxide gas and the welding wire to the torch 6. The welding machine 2 and the welding wire feeding device 5 are composed of a tube 7 and the like, and the welding machine 2 and the welding wire feeding device 5 include a hose 8 that supplies carbon dioxide gas,
It is connected with a control cable 9, a welding power supply cable 10, etc., and the negative terminal of the welding machine 2 is connected to the power supply cable 11.
It is connected to the base material 12 via.

The welding wire feeding device 5 is configured as shown in FIG. 2, and a wire reel 22 around which a welding wire 21 is wound is rotatably supported on a support portion 20a provided on one side of the housing 20. . The support part 2
A straightening roll 23 for straightening the twist of the welding wire 21 pulled out from the wire reel 22 is provided at the lower part of the wire 0a. The interior 20d of the housing 20 forms a sealed space, and the welding wire 21
A filter 25 for removing dust and spatter (hereinafter referred to as foreign matter) attached to the welding wire 21 and a feed roll 26 for feeding the welding wire 21 to the torch 6 are housed.

The filter 25 is attached to the holder 3 as shown in FIG.
0 and a case 31, one end 3 of the holder 30
0a is fitted into a hole 20e drilled at a predetermined location in a side wall 20b of the housing 20, and is screwed onto the side wall 20b with a nut 32. This holder 3
A hole 30c through which the welding wire 21 is inserted with a slight gap is bored in the axial center of the hole 30c.

The case 31 has a cylindrical shape with a bottom, and a bottom 31a.
A screw hole 31b is bored in the hole 31b, and a hole 31c is bored in the axis of the hole 31b through which the welding wire 21 can be inserted with a slight gap. Two slits 31f and 31g are provided at predetermined positions along the axial direction of the peripheral wall 31e surrounding the hollow part 31d, and these two slits 31f and 31g are arranged so that the inner diameter of the hollow part 31d is larger than the inner diameter of the hollow part 31d, as shown in FIG. It also opens in the circumferential direction with a slightly smaller width. Inside the case 31 are two disc-shaped filter elements 35 and 36,
A partition member 37 interposed between these filter elements 35 and 36 is fitted. Each filter element 35, 36 and partition member 37
Holes 35a, 36a, and 37a having a diameter slightly larger than the wire diameter of the welding wire 21 are bored in each axis of the welding wire 21.

As shown in FIGS. 3 and 4, the filter element 35 has a tightening ring 4 inserted through the slit 31f of the case 31 approximately at the center of its outer peripheral surface.
The central hole 35a is tightened by the body 40a of 0.
The welding wire 21, which has been reduced in diameter and inserted into the outer hole 35a, is tightened with an appropriate force, and both ends 40 of the tightening ring 40 located in the slit 31f are tightened.
b and 40c, making it impossible to move in the axial direction. The filter element 36 is similarly tightened by a tightening ring 41 inserted through the slit 31g, and is made immovable in the axial direction. These filter elements 35, 36 are made of oil-impregnated gland packing, for example. Furthermore, the partition wall member 37 is made of, for example, a rubber member.

A rubber cover 38 is removably press-fitted to the open end of the case 31, and a hole 38a with a diameter slightly larger than the wire diameter of the welding wire 21 is provided at the axis of the outer cover 38.
is drilled. Then, the welding wire 21 is introduced into the filter 25 through the hole 30c of the holder 30 of the filter 25, and the welding wire 21 is introduced into the filter element 3.
After being tightened and inserted into each of the holes 35a and 36a of 5 and 36, it is led out of the filter 25 through the hole 38a of the lid 38.

Returning to FIG. 2 again, a feed roll 26 is disposed on the welding wire lead-out side of the filter 25, and the feed roll 26 includes a pair of rolls 26a and 26b, and the roll 26 is driven by a motor (not shown). The welding wire 21 is driven and cooperates with the roll 26b.
and put the welding wire 21 on the wire reel 22.
It is adapted to be drawn out from the tank and fed to the torch 6 (FIG. 1). The motor is connected to a control device built into the welding machine 2 via a cable 9, and is driven at a predetermined speed to feed the welding wire 21 at a constant speed.

Side wall 2 facing side wall 20b of housing 20
A metal fitting 27 for introducing the welding wire is screwed into a hole 20f bored at 0c opposite the welding wire delivery position of the feed roll 26, and one end of the conduit tube 7 is fixed to the metal fitting 27. has been done. Carbon dioxide gas is introduced into the sealed space 20d of the housing 20 through the pipe 8 and is guided through the conduit tube 7 to the nozzle of the torch 6.

The action will be explained below.

The welding machine 2 guides the carbon dioxide gas discharged from the cylinder 3 through the regulator 4 through the tube 8 into the housing 20 of the welding wire feeder 5, and drives the motor of the feed roll 26 via the cable 9. The roll 26a of the feed roll 26 is rotated, and a welding current is further supplied to the welding wire 21 via the cable 10. The feed roll 26 pulls out the welding wire 21 from the wire cable 22 as it rotates. This drawn-out welding wire is introduced into a filter 25 after its twist is corrected by a correction roll 23. The filter 25 uses filter elements 35 and 36 to remove foreign substances such as dust from the introduced welding wire 21 through holes 35a and 36a.
Removed during interpolation. The welding wire 21 from which dust has been removed is introduced into the conduit tube 7 from the metal fitting 27 via the feed roll 26, transported within the conduit tube 7 at a constant speed, and fed to the torch 6. The carbon dioxide gas introduced into the housing 20 is transferred through the conduit tube 7, reaches the nozzle of the torch 6, and is blown out from the nozzle.

In addition, each filter element 3 of the filter 25
By supplying oil to the conduit tubes 5 and 36 from the slits 31f and 31g, it is possible to improve the efficiency of wiping off dirt and to make the transfer within the conduit tube 7 smoother.

In this embodiment, the case where the filter 25 is housed in the housing 20 has been described.
The arrangement is not limited to this, and may be arranged outside the housing.

(Effects of the invention) As explained above, according to the invention, at least A filter is provided at a position in front of the welding wire introduction port of the conduit tube to remove foreign matter attached to the welding wire through which the welding wire is inserted, thereby preventing foreign matter from entering the conduit tube. This makes it possible to prevent clogging of the conduit tube, and as a result, it becomes possible to reliably feed the welding wire to the torch. Further, the filter has the advantage that it can be easily attached to a conventional welding work supply device.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a carbon dioxide arc welding device to which a welding wire feeding device according to the present invention is applied, Fig. 2 is a sectional view of the welding wire feeding device, and Fig. 3 is an embodiment of a filter according to the present invention. FIG. 4 is a sectional view taken along the arrow line in FIG. 2... Welding machine, 5... Welding wire feeding device, 6
...Torch, 7...Conduit tube, 20...
...housing, 21 ... welding wire, 22 wire reel, 25 ... filter, 30 ... holder,
31... Case, 35, 36... Filter element, 37... Partition member, 38... Lid, 40,
41...Tightening ring.

Claims (1)

[Scope of utility model registration request] A housing of a welding wire feeding device that pulls out the welding wire wound around a wire reel, passes it through the conduit tube, and feeds it to the torch, at least at a position in front of the inlet of the welding wire of the conduit tube. A welding wire feeding device characterized in that a filter is provided for removing foreign matter attached to the welding wire through which the welding wire is inserted.