JP3001949U - Gas shield arc welding torch - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the screw for screwing with the insulating cylinder is crushed, the nozzle is held accurately and concentrically with respect to the hollow tip. A male screw portion 30 is engraved on the outer peripheral surface of the rear end portion of the nozzle 3, a holder 6 is externally fitted over the nozzle and the insulating cylinder 2, and the nozzle is formed by pressing or screwing the holder and the male screw portion of the nozzle. Are held concentrically with the hollow tip 4. The male screw portion may be spiral or linear in the longitudinal direction, but can be more accurately and concentrically held by bulging outwardly in the radial direction. A synthetic resin tube having heat resistance and insulation can be used for the holder.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas shielded arc welding torch, and more particularly to a structure capable of removing spatter adhering to the nozzle of the welding torch without removing the nozzle from the torch.

[0002]

[Prior art]

 In the gas shielded arc welding method, welding work is generally performed using the welding torch shown in FIG. That is, in FIG. 4, the cylindrical torch body 1 has a substantially V shape, and the hollow tip 4 is screwed into the tip portion of the torch body 1, and the welding electrode welding wire is attached to the torch body 1 from the rear end. 5 is inserted, and the welding wire 5 is inserted and held in the hollow tip 4. An insulating cylinder 2 is screwed to the tip of the torch body 1, an orifice 4a is provided in front of the insulating cylinder 2, and a gas nozzle 3 is screwed to the insulating cylinder 4 to connect the nozzle body 1 to the nozzle body 1. The shield gas is fed from the rear end side, and the shield gas is jetted from the gas nozzle 3 through the orifice 4a.

By the way, in the gas shielded arc welding method, a phenomenon in which spatter adheres to the torch tip portion, particularly the inner surface of the tip portion of the gas nozzle or the outer surface of the hollow tip, is likely to occur. Although this deposited spatter can be removed relatively easily in the initial stage, it is troublesome to perform the removal work during welding work, and there is a tendency to continue to use it with spatter deposited for a long time. Short circuit occurs between the gas nozzle and the gas nozzle, the stability of the arc is impaired, smooth welding work is hindered, and the spatter is remelted and firmly fixed to the inner peripheral surface of the gas nozzle. There were many things.

Therefore, conventionally, a dedicated shaver and a hammer have been used to remove the gas nozzle from the torch and then hit the spatter strongly to remove it.

[0005]

[Problems to be Solved by the Invention] However, in the removal method by striking the shaver, it is necessary to remove the gas nozzle from the torch each time, and not only the work is very complicated but also the gas nozzle is deformed. There was a problem.

On the other hand, the inventor of the present invention has developed a spatter removal device for a gas-shielded arc welding torch that can easily remove spatter without removing the nozzle from the torch and without causing deformation of the nozzle. Then, the application was filed (see Japanese Utility Model Application No. 5-14303).

However, due to the structure of the torch, the hollow tip and the welding wire are extended from the torch side in the nozzle, and the removal tool interferes with the hollow tip and the welding wire to smoothly remove the spatter. It may not be possible. In particular, copper-based alloy is used as the material of the nozzle, which is soft, the nozzle screw is easily crushed, the nozzle rattles and is biased against the hollow tip, and there is a particular concern about interference with the removal tool. Required to do so.

In view of the above point, the present invention provides a gas shield arc welding torch capable of holding the nozzle accurately and concentrically with respect to the hollow tip even if the screwing screw is slightly crushed. And

[0009]

[Means for Solving the Problems]

 Therefore, the gas shielded arc welding torch according to the present invention is a gas shielded arc welding torch in which a nozzle is attached to the tip of the torch body via an insulating cylinder and a hollow tip is inserted inside the nozzle. An external thread is engraved on the outer peripheral surface of the nozzle, a holder is fitted over the nozzle and the insulating tube, and the nozzle is held concentrically with the hollow tip by pressure contact or screw engagement between the holder and the male external thread. It is characterized by doing so.

When performing smooth sputter removal, it is essential that the nozzle be concentric with the hollow chip so that the removal tool does not interfere with the hollow chip. Usually, it is considered that the holder is fitted on the nozzle and the insulating cylinder to hold the nozzle concentrically. However, if the screw of the nozzle is crushed and there is rattling in the screw with the insulating cylinder, the nozzle will loosen. It is difficult to maintain the correct concentricity because it turns in the direction. Therefore, by engraving a male screw part on the outer peripheral surface of the rear end of the nozzle, and by externally fitting the holder to this and the insulating cylinder, and strongly pressing or screwing the male screw part and the holder, the nozzle is made stronger by the male screw part. As a result of being pressed or screwed and prevented from turning in the loosening direction, the nozzle can be accurately held concentrically even if the screw for screwing with the insulating tube is crushed. A similar male portion may be provided on the insulating cylinder side.

The external thread portion of the outer peripheral surface of the nozzle may be in a spiral shape or a linear shape extending in the longitudinal direction, as long as it has a shape to be pressed against or screwed into the holder. The holder may be formed by forming a female screw portion that can be screwed into the male nozzle portion of the nozzle, or may be a cylindrical member that can be externally fitted. In this case, a heat-resistant and insulating synthetic resin tube such as a heat-resistant silicone rubber tube or a heat-resistant fluorine-based rubber tube can be used.

When the holder and the male thread of the nozzle are pressure-welded, the outer peripheral surface of the nozzle rear end is bulged outward in the radial direction and the male thread is engraved on the outer circumferential surface of the nozzle, so that the male thread is more strongly pressure-contacted, and therefore the screw engagement can be made more reliable. , And more preferable.

In the case of the welding torch according to the present invention, it is possible to smoothly and easily remove spatter by using the removal device according to the prior application (see Japanese Patent Application No. 5-14303), but of course, other devices, for example, Spatter can also be removed using a rotary cutting tool. As an example, a cutting tool having a cutting edge formed on a cylindrical tip edge can be used. For this cutting tool, for example, a hole saw with the centering rod removed can be used, but it is preferable to use one having an outer diameter slightly smaller than the inner diameter of the nozzle.

[0014]

[Operation and effect of device] When removing spatter adhered and fixed to the nozzle, after holding the mutual position of the insulating cylinder and the nozzle by the holder with the nozzle attached to the tip of the torch, install the removal tool in the nozzle. It can be inserted and the spatter adhering to the nozzle can be removed.

At that time, the holder and the male screw portion of the outer peripheral surface of the nozzle are strongly pressed or screwed together to prevent the nozzle from turning in the loosening direction, and the nozzle is accurately held concentrically with respect to the hollow tip. Therefore, even if the screw thread between the nozzle and the insulating tube is crushed, the removal tool does not interfere with the hollow tip, and only spatter can be removed smoothly and reliably.

[0016]

【Example】

 Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. FIG. 1 schematically shows a gas shielded arc welding torch according to an embodiment of the present invention. In the figure, a holder 6 is externally fitted to the tip gas nozzle 3 of the torch body 1 and the insulating cylinder 2, and the holder 6 is made of heat-resistant silicone rubber and has, for example, a wall thickness of 1 to 6 mm and a length of 20 to 30 mm. It is manufactured in the shape of a tube.

A plurality of ridges are formed on the outer peripheral surface of the rear end portion of the gas nozzle 3 so as to extend in the longitudinal direction, and a male screw portion 30 is bulged and engraved, and the male screw portion 30 is formed on the inner surface of the holder 6. Correspondingly, a concave groove portion (female screw portion) 60 is formed. It should be noted that the tip end side of the holder 6 is preferably formed thin so that the gas nozzle 3 can be easily mounted.

FIG. 2 shows a peeling device 7 used for removing the spatter of the welding torch. In the peeling device 7, a nozzle insertion cylinder 71 is provided on the upper surface of the case 70 so as to extend inside, and a peeling pipe (removal tool) 72 is provided concentrically and downward at the nozzle insertion cylinder 71. The lower end is fixed to the mounting base 77. At the upper end of the peeling pipe 72, three or four blades 73 are provided so as to be folded back outward, and an operation pipe 74 is slidably mounted on the outer periphery of the pipe 72. The operating lever 75 is connected, and the operating lever 75 is biased upward by a coil spring 76.

Next, a method for removing spatter will be described. If spatter adheres to the nozzle 3 of the welding torch during welding work, rest the welding work, swing the operating lever 75 of the peeling device 7 downward, and slide the operating pipe 74 downward. Then, the gas nozzle 3 is inserted into the nozzle insertion cylinder 71 of the peeling device 7. Then, since the tip blade 73 of the pipe 72 contracts inward, the gas nozzle 3 can be inserted into the nozzle insertion tube 71 without the sputtering of the hollow tip 4 and the inner surface of the gas nozzle 3 interfering with the blade 73 and the pipe 72. .

Next, when the hand is released from the operation lever 75, the operation pipe 74 slides upward by the spring force of the coil spring 76 to expand the tip blade 73 outward, and in that state, the gas nozzle 3 When the blade is pulled straight out from the nozzle insertion cylinder 71, the blade 73 comes into sliding contact with the inner peripheral surface at the back of the gas nozzle 3. Here, spatter adheres strongly to the tip of the nozzle 3, but since the blade 73 is easily caught by the spatter adhering to the back of the nozzle 3, the spatter inside the gas nozzle 3 gradually increases from the back to the tip side. It is lightly peeled off.

Therefore, the welding torch can be set in the peeling device 7 and the spatter can be removed simply by pulling it out, there is no need to remove the gas nozzle 3, and the operation is very simple, and it is not bothersome as in the past, and it can be repeatedly used. But you can easily remove the spatter, for example, while resting the welding process. Normally, in the case of high-voltage continuous welding, the tip of the nozzle 3 is at a high temperature of 220 ° C or higher, and if you try to remove spatter with a dedicated shaver, you will not be able to hold the nozzle 3 by hand and the nozzle 3 will cool to some extent Although it is necessary to wait and a waiting time is required, the waiting time required for the welding torch of this example is unnecessary, and waste of time can be eliminated.

As a result, the spatter can be surely removed before the spatter is remelted, and it is not necessary to perform a complicated work using a dedicated shaver and a hammer as in the conventional case, and the gas nozzle 3 is deformed. Nothing.

FIG. 3 shows a cutting device 8 used for removing the spatter of the welding torch. In the cutting device 8, a nozzle insertion tube 81 is provided on the upper surface of the case 80 so as to extend inward, and below the nozzle insertion tube 81, a rotary shaft 83 extends vertically and is rotatably supported by a mounting base 84. A cutting tool (removal tool) 82 is attached to the rotary shaft 83.

The cutting tool 82 is formed by forming a large number of cutting edges on the tip edge of a cylindrical body having an outer diameter slightly smaller than the inner diameter of the gas nozzle 3, and a pulley 85 is fixed to the lower end of the rotary shaft 83. The pulley 85 is connected to a drive pulley 87 by a belt 86, and the drive pulley 87 is attached to the rotating shaft of a motor 88.

When removing spatter, the nozzle 3 and the insulating cylinder 2 are covered with the holder 6 in the same manner as described above, and the elastic force of the holder 6 holds the holder 3 concentrically with respect to the hollow chip 4, and then the cutting is performed. When the motor 88 of the device 8 is operated and the gas nozzle 3 is inserted into the nozzle insertion cylinder 81, the cutting tool 82 rotates without interfering with the hollow tip 5 and cuts the spatter on the inner surface of the gas nozzle 3, so that the necessary portion is cut. By inserting the gas nozzle 3 up to, the spatter can be removed by cutting.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a gas shielded arc welding torch according to an embodiment of the present invention.

FIG. 2 is a cross-sectional configuration diagram of essential parts showing a peeling device used for removing spatter of the welding torch.

FIG. 3 is a diagram showing a cutting device used for removing spatters of the welding torch, an overall configuration, and a cutting tool.

FIG. 4 is a diagram for explaining a gas shield arc welding torch.

[Explanation of symbols]

1 Torch body 2 Insulation cylinder 3 Gas nozzle 30 Male screw part 4 Hollow tip 5 Welding wire 6 Holder 60 Female screw part

Claims (5)

[Scope of utility model registration request] 1. A torch for gas shield arc welding, comprising a nozzle 3 attached to the tip of a torch body 1 via an insulating cylinder 2, and a hollow tip 4 inserted in the nozzle 3, wherein the rear end of the nozzle 3 is provided. A male screw portion 30 is engraved on the outer peripheral surface, a holder 6 is externally fitted over the nozzle 3 and the insulating cylinder 2, and the nozzle 3 is pressed or screwed to the holder 6 and the male screw portion 30 of the nozzle 3. Is held concentrically with the hollow tip 4 for gas shielded arc welding. 2. The torch for gas shield arc welding according to claim 1, wherein the male screw portion 30 is engraved in a spiral shape or a linear shape extending in a longitudinal direction. 3. The torch for gas shield arc welding according to claim 2, wherein the outer peripheral surface of the rear end portion of the nozzle 3 is bulged outward in the radial direction, and the male screw portion 30 is engraved on the bulged portion. . 4. The torch for gas shield arc welding according to claim 1, wherein the holder is a tube made of synthetic resin having heat resistance and insulation. 5. A removal tool is inserted in the nozzle 3 so as not to interfere with the hollow tip 4, and the spatter can be removed or cut by pulling out or rotating the removal tool. A torch for gas shielded arc welding according to any one of 1.