JPH0137833Y2 - - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology belongs to the technical field of making it possible to completely remove spatter in a welding torch used for CO ₂ MIG and MAG welding.

This invention relates to a welding torch in which a bush for removing spatters slides on the outer periphery of the chip, and spatters can be removed by the action of the bushing. This invention relates to a welding torch that can perform complete welding over the entire stroke.

<Prior art> Conventionally, welding torches have been equipped with a spatter removal mechanism, but the operation of the spatter removal mechanism is such that the spatter removal bush slides over the inner wall of the nozzle and the vicinity of the outer wall of the contact tip for a predetermined stroke. This sliding action removed the adhering spatter.

<Problem to be solved by the invention> However, in the welding torch according to the above-mentioned conventional technology, if the bush cannot slide the entire stroke for some reason, the bush stops midway and reverses motion. As a result, spatter removal by the bushing is not sufficient, and spatter adhering to the inner wall of the nozzle and the outer wall of the contact tip accumulates, causing a turbulent flow of shielding gas. Therefore, there were various inconveniences such as deterioration of shielding properties.

<Purpose of the invention> The purpose of this invention is to solve the problem of spatter removal in welding torches based on the above-mentioned conventional technology, and to completely remove spatter while ensuring the bush operates over the entire stroke. It is an object of the present invention to provide an excellent welding torch that can benefit the field of application of joining technology in the mechanical equipment industry.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem. In a welding torch which is slidable on the outer circumference of a tip mounting bracket having a welding wire supply hole and a contact tip, the tip of the piston has a longitudinal axis attached to the outer surface of the contact tip and the inner surface of the shield nozzle. The welding torch is characterized in that it is provided with a bush that is movable in a direction, and is further provided with a piston detection mechanism at the sliding top dead center and bottom dead center positions of the piston.

<Operation> Therefore, a piston detection mechanism is provided at the forward and backward ends of the sliding stroke of the piston that operates the spatter removal bushing, and the detection mechanism confirms that the piston moves the entire stroke. Therefore, the bush at the tip of the piston moves along the longitudinal direction on the outer surface of the contact tip and the inner surface of the shield nozzle, and spatter on the inner wall surface of the shield nozzle and the outer wall surface of the contact tip can be reliably removed. The measures were taken.

<Example> Next, an example of this invention will be described below based on the drawings.

The drawing shows a longitudinal cross-sectional view of a welding torch, which is the gist of this invention. Reference numeral 1 denotes a torch body, and a shield nozzle 2 is provided at the lower end of the torch body. This is for making the shielding gas G supplied from the shielding gas inlet 3 provided on the side of the welding work area eject in a laminar flow state into the welding work area.

A tip mounting bracket 4 having a T-shaped cross section is attached from the top to the inside of the torch body 1, and its upper end is fixed to the torch body 1 with a screw 5. A contact tip 6 is attached to the lower end of the tip mounting bracket 4, and a welding wire W supplied from the contact tip 6 through a wire supply hole 7 formed in the axial center of the tip mounting bracket 4 is welded. A current is supplied.

A piston 8 having a T-shaped cross section is slidably attached to the outer circumference of the shank of the chip mounting bracket 4, and a flange 8a is attached to the upper end of the piston 8.
is formed and is movable up and down in a cylinder 9 formed inside the torch body 1,
The sliding stroke L of the piston 8 is determined by the vertical dimensions of the cylinder 9.

A bush 8b for removing spatter is fixed to the lower end of the piston 8 by a screw 9'.

On the other hand, a lower air passage 10 is provided on the side of the torch body 1 and communicates with the lower end of the cylinder 9, and an upper air passage 11 is provided on the upper part of the tip mounting bracket 4 to communicate with the lower end of the cylinder 9. It is connected to the top.

An air supply section 13 equipped with a solenoid valve 12 in the lower air passage 10 and the upper air passage 11;
and 14 are in communication with each other, and air E is supplied to the solenoid valve 12 from a pump (not shown).

Further, O-rings 15a and 15b are attached to the inner and outer peripheral surfaces of the flange 8a of the piston 8, respectively, and an O-ring 15c is attached to the lower end of the piston 8 to prevent leakage of the shield gas G and air E. has been done.

An upper piston retraction end detection passage 16 is connected to the upper end of the cylinder 9, and a sensing unit 1 for converting an air signal into an electrical signal is connected to the upper end of the cylinder 9.
It is connected to 7.

Further, a lower piston retraction end detection passage 18 is communicated with the lower end of the cylinder 9 and connected to a sensing unit 19.

In the above-described configuration, when performing a spatter removal operation using a welding torch, air E is first supplied from the air supply path 11 into the cylinder 9 by predetermined switching of the solenoid valve 12, and the piston 8 is lowered by the air pressure. As a result, the bush 8b attached to the lower end of the piston 8 is connected to the shield nozzle 2.
The spatter adhering to the inner wall surface of the contact chip 6 and the outer wall of the contact chip 6 is mechanically removed.

After the setting unit 19 detects in a predetermined manner that the piston 8 has moved the stroke L to the lowest end and the bush 8b has protruded from the tip of the shield nozzle 2 by a distance S, the solenoid valve 12 is activated. is switched, air E is supplied to the lower air supply path 10, and the piston 8 moves upward.

The sensing unit 17 then confirms that the piston 8 has returned to its original position at the uppermost end.

It goes without saying that the embodiment of this invention is not limited to the above-described embodiment; for example, it is also possible to use electric contacts as a means for detecting the top dead center and bottom dead center of the stroke of the piston. Various aspects can be adopted.

<Effects of the invention> As mentioned above, according to the welding torch of this invention,
Since the top dead center and bottom dead center of the piston stroke are detected by the detection mechanism, the bush at the tip of the piston is reliably aligned with the outer wall surface of the contact tip and the inner surface of the shield nozzle in the spatter removal operation. Since the contact tip and the spatter adhering to the shield nozzle are completely removed, shielding defects caused by shielding gas are prevented, and the best welding results are obtained. Excellent effects are achieved.

Further, even if the piston stops in the middle of its stroke, the detection mechanism detects the stoppage, so that it is possible to quickly take measures against malfunctions.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing one embodiment of the welding torch according to this invention. 8b... Spatter removal bush, 8... Piston, 7... Welding wire supply hole, W... Welding wire, 6
...Contact chip, 4...Chip mounting bracket, 1
7, 19... Piston detection mechanism.

Claims (1)

[Scope of utility model registration request] In a welding torch, a piston having a bush for spatter removal at the tip is slidable against the outer circumference of a tip mounting bracket having a welding wire supply hole and a contact tip, and the contact tip is attached to the tip of the piston. A welding method characterized in that a bush is provided that is movable in the longitudinal direction on the outer surface and the inner surface of the shield nozzle, and a piston detection mechanism is provided at the sliding top dead center and bottom dead center positions of the piston. torch.