JPH0539766U - Welding torch - Google Patents

Abstract

(57) [Abstract] [Purpose] To increase the contact area between the torch body and the power supply nozzle tip without increasing the outer diameter of the welding torch. [Structure] At the tip of the wire insertion hole 9 of the torch body 2,
A taper hole 5 is provided whose diameter gradually increases toward the tip side. A tapered boss portion 12 having a shape complementary to the tapered hole 5 is formed at a base end portion of the power supply nozzle tip 6, and an outward flange portion 11 is formed at an intermediate portion. The tapered boss portion 12 is fitted into the tapered hole 5, the cap nut 7 is engaged with the outward flange portion 11 of the inward flange portion 14 of the tip end thereof, and the cap nut 7 is fastened to the torch body 2 to fix the power supply nozzle tip 6. It is fixed integrally to the torch body 2. [Effect] Since the power supply nozzle tip and the torch body are in contact with each other at their tapered surfaces, the contact area can be widened without increasing the outer diameter of the tapered surfaces, so that high-efficiency welding is performed by passing a high current. be able to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding torch, and more particularly to a welding torch for performing arc welding with high efficiency while simultaneously feeding a plurality of thin electrode wires to a power supply nozzle tip.

[0002]

[Prior Art]

 Conventionally, there is a welding torch in which arc welding is performed while feeding an electrode wire, and in order to improve the wire welding efficiency, a plurality of thin wires are simultaneously fed and welded. In such a welding torch, a power supply nozzle tip having a plurality of wire insertion holes is fixed to the tip of a cylindrical torch body through which a wire can be passed by fastening a cap nut to the torch body. There is.

In the above welding torch, for example, the base end portion of the power supply nozzle tip is formed in a taper shape that expands toward the base end side, and a complementary shape is formed so that the taper portion can be received and fitted. There is a type in which the power supply nozzle tip is fixed by screwing a cap nut forming the torch body into close contact with the taper. However, in this structure, when the power supply nozzle tip is replaced, if both tapers are in close contact with each other with a large frictional force, the power supply nozzle tip will not rotate together when the cap nut is turned off. However, since a plurality of wires are entangled with each other, there has been a problem that replacement work is complicated, such as cutting the wire on the wire feeding roll side in advance and separating the cap nut and the power supply nozzle tip.

Further, as disclosed in, for example, Japanese Utility Model Laid-Open No. 62-67680, an outward flange portion is formed at a base end portion of a power supply nozzle tip and an inward flange portion is formed at a tip end portion of a cap nut. There is something I did. According to this structure, the power supply nozzle tip is fixed by the engagement between the flange portions when the cap nut is tightened. Since the axial end faces are thus engaged with each other, the cap nut can be easily separated from the power supply nozzle tip by loosening the cap nut when detaching.

[0005]

[Problems to be solved by the device]

 By the way, when a plurality of welding torches are arranged in parallel and high-efficiency arc welding is performed, the distance between the welding torches may be set to about 15 to 30 mm depending on the welding conditions. The outer diameter of the torch body is restricted. The maximum value of the current that flows between the torch body and the power supply nozzle tip is determined by the size of the contact area between them.

In the above-mentioned Japanese Utility Model Laid-Open No. 62-67680, since the axial end faces of the both facing each other are in contact with each other, as described above, when the outer diameter of the welding torch cannot be increased, Has a small contact area between the torch body and the power supply nozzle tip. Therefore, when welding current is applied with a relatively high current, heat is generated at the contact surface, the outward flange of the power supply nozzle tip thermally expands, and the tightening force of the screw between the cap nut and torch body is increased. It may become too large and difficult to remove. Further, as described above, since the power supply nozzle tip is attached to the torch body so that the end faces in the axial direction are in contact with each other, when the contact area is small, it is easy to attach the tip by tilting. Since the arc is not generated sufficiently due to the unstable contact condition, there is a problem that the mounting work must be performed with high accuracy, and the mounting work becomes complicated.

In view of the problems of the prior art, the main object of the present invention is to increase the contact area between the torch body and the power supply nozzle tip without increasing the outer diameter of the welding torch. It is an object of the present invention to provide a welding torch capable of easily mounting the power supply nozzle tip.

[0008]

[Means for Solving the Problems]

 For this purpose, according to the present invention, a cylindrical torch body having an axial hole for inserting an electrode wire, a power supply nozzle tip having an axial hole for passing the wire, and the power supply are provided. A welding torch having a cap nut for coaxially fixing a nozzle tip to the tip portion of the torch body, wherein a tapered hole that expands in diameter toward the tip side is coaxial with the axial hole of the torch body. And a tapered boss portion that complementarily fits with the tapered hole is formed at the base end portion of the power supply nozzle tip. In particular, it is preferable that an intermediate flange of the power feeding nozzle tip is provided with an outward flange portion that engages with an inward flange portion of the distal end portion of the cap nut with an axial end surface when the cap nut is fastened to the torch body.

[0009]

[Action]

 With this configuration, since the torch body and the power supply nozzle tip are in contact with each other at the tapered surface, the contact area can be easily widened without increasing the outer diameter. Further, since the power supply nozzle tip engages with the inward flange portion of the distal end portion of the cap nut with the axial end face, both engaging end faces can be easily separated by loosening the cap nut.

[0010]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing a welding torch 1 to which the present invention is applied. This welding torch 1 is used in arc welding. The torch body 2 has a cylindrical shape, and a plurality of small-diameter electrode wires 4 fed from a feeding reel (not shown) are inserted into the axial hole 3 of the torch body 2. On the tip end side of the torch body 2 of the axial hole 3, there is coaxially formed a tapered hole 5 whose diameter gradually increases from the inside near the tip to the tip. Further, a screw portion 8 for screwing a cap nut 7 for fixing the power feeding nozzle tip 6 to the tip portion of the torch body 2 is provided on the outer peripheral surface of the tip portion of the torch body 2.

The power supply nozzle tip 6 is provided with the same number of wire insertion holes 9 as axial holes to allow the plurality of wires 3 inserted through the torch body 2 to pass along the axial direction. The power supply nozzle tip 6 is formed in a columnar shape from the tip to the middle portion. An outward flange portion 11 having a diameter slightly larger than the outer diameter of the cylindrical portion is formed in the middle of the power supply nozzle tip 6, and a portion extending from the outward flange portion 11 to the base end is formed. A tapered boss portion 12 which can be complementarily fitted in the tapered hole 5 is coaxially formed.

The cap nut 7 is provided with an inner threaded portion 13 that can be screwed into the threaded portion of the torch body 2 at the base end portion thereof, and at the tip end thereof, outside the cylindrical portion of the power supply nozzle tip 6. It has an inward flange portion 14 that is slightly expanded in diameter rather than the diameter and can engage with the outward flange portion 11.

To attach the power supply nozzle tip 6 to the torch body 2, first, the tapered boss portion 12 is inserted into the tapered hole 5 of the torch body 2. Next, the cap nut 7 is screwed onto the screw portion 8 of the torch body 2 with the inward flange portion 14 loosely fitted to the outer peripheral surface of the cylindrical portion of the power supply nozzle tip 6. Then, the cap nut 7 is rotated and tightened by a tool such as a spanner, and the tapered surfaces of the tapered boss portion 12 and the tapered hole 5 are fitted to each other. The mind can be properly aligned, and the runout at the time of assembly can be easily prevented, and the power supply nozzle tip 6 is fixed to the torch body 2.

In this way, the power feeding nozzle tip 6 is attached to the tip of the torch body 2. As described above, the outward flange portion 11 of the power feeding nozzle tip 6 and the inward flange portion 14 of the cap nut 7 are mutually attached. The engagement of the opposing end faces in the axial direction prevents the power supply nozzle tip 6 from coming off. Therefore, when the power supply nozzle tip 6 is replaced for some reason, the flange nuts 11 and 14 are easily separated from each other by loosening the cap nut 7, so that the power supply nozzle tip 6 can be easily replaced. .

In the main welding torch 1, since the contact portion between the taper boss 12 and the taper hole 5 through which the energizing current flows during arc welding forms a tapered surface, the torch body 2 and the power feeding unit The energization area can be increased without increasing the outer diameter of the nozzle tip 6. Therefore, in an apparatus in which a plurality of welding torches 1 are arranged to perform arc welding, the pitch between the welding torches 1 can be reduced and a high current can be flowed, and highly efficient arc welding can be performed. Further, due to the taper contact structure, the thermal expansion in the axial direction of the power supply nozzle tip 6 when a high current is applied can be suitably escaped, and the screwing of the screw portion due to the thermal expansion can be prevented.

[0016]

[Effect of the device]

 As described above, according to the present invention, since the torch body and the power supply nozzle tip are in tapered contact with each other, it is possible to easily widen the mutual contact area without increasing the outer diameter of the torch body. Can be suppressed and the alignment of the shaft center at the time of assembly can be easily performed. Further, since the power supply nozzle tip engages with the inward flange portion of the tip portion of the cap nut with the axial end surface, the cap nut can be easily separated by loosening the cap nut, so replacement work can be performed easily. The effect is extremely large.

[Brief description of drawings]

FIG. 1 is a view showing a welding torch according to the present invention broken along an axial direction.

[Explanation of symbols]

 1 Welding torch 2 Torch body 3 Axial hole 4 Electrode wire 5 Taper hole 6 Power supply nozzle tip 7 Cap nut 8 Screw part 9 Wire insertion hole 11 Outer flange part 12 Tapered boss part 13 Inner screw part 14 Inward flange part

Claims (2)

[Scope of utility model registration request] 1. A cylindrical torch body having an axial hole for inserting an electrode wire, a power supply nozzle tip having an axial hole for passing the wire, and the power supply nozzle tip at the tip of the torch body. A welding torch having a cap nut for coaxially fixing to the portion, wherein a taper hole that expands in diameter toward the tip side is coaxially formed in the axial hole of the torch body, and the power feeding nozzle tip A welding torch, wherein a tapered boss portion that complementarily fits the tapered hole is formed at a base end portion of the welding torch. 2. An outward flange portion is provided at an intermediate portion of the power supply nozzle tip so as to engage with an inward flange portion of a tip portion of the cap nut with an axial end face when the cap nut is fastened to the torch body. Claim 1 characterized by the above.
Welding torch described in.