JP2011000608A - Tig welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding torch in which a front collet does not press a front collet body with excessive pressure.SOLUTION: In the TIG welding torch 20, a fore end of a front collet 27 is pressed against an inner surface of a front collet body 28 to hold a non-consumable electrode 3, a fore end of a rear collet body 22 is abutted on a base end of the front collet 27, and a rear collet holder 30 provided on a base end side of a torch body 21 is screwed to allow a rear collet 26 to hold the non-consumable electrode 3. By screwing a front collet holder 24, the rear collet body 22 presses the front collet 27 to hold the non-consumable electrode 3. A spring 23 for the front collet is pallowed to abut on the rear collet 26 through the front collet holder 24 and the spring 23 for the front collet.

Description

  The present invention relates to an improved TIG welding torch for performing TIG welding.

  In general TIG welding torches, when replacing non-consumable electrodes, loosen the collet retainer provided on the base end side of the TIG welding torch, and then pull out the non-consumable electrodes from the tip side of the TIG welding torch. It was. Therefore, for example, when a TIG welding torch is attached to the tip of a manipulator of a welding robot, when an object to be welded exists in front of the TIG welding torch, the non-consumable electrode is pulled out from the tip of the TIG welding torch. I can't. Therefore, after moving the TIG welding torch to the base end side, it is necessary to draw out and replace the non-consumable electrode from the front end side, so that the working efficiency is lowered. Therefore, conventionally, a TIG welding torch that can easily replace a non-consumable electrode without moving the TIG welding torch rearward has been proposed. Hereinafter, a conventional TIG welding torch will be described with reference to FIG.

  FIG. 2 is a cross-sectional view of a conventional TIG welding torch 1. In the figure, a front collet body insertion hole into which a later-described front collet body 4 is screwed is formed at the front end portion of the torch body 6, and a rear collet body into which a later-described rear collet body 8 is inserted at the base end portion. An insertion hole is formed. The rear collet body insertion hole is formed up to the vicinity of the base end of the front collet body insertion hole, and a front collet body insertion hole and a rear collet body insertion hole, which will be described later. A front collet insertion hole through which the collet 2 is inserted is formed.

  The front collet 2 is provided with an electrode insertion hole through which the non-consumable electrode 3 (tungsten electrode) is inserted in the shaft core portion, a tapered portion is formed at the tip portion, and extends from the tip portion along the electrode insertion hole. A vertical slot that omits is formed. The front collet body 4 is provided with a front collet insertion hole in the shaft core portion and a plurality of shield gas holes 5 formed in the tip portion. Further, the front collet body 4 is formed with a taper taper portion in contact with the taper taper portion of the front collet 2 on the inner surface of the front end portion and screwed into the front end portion of the torch body 6. The base end portion of the front collet 2 is inserted into the rear collet body insertion hole through the front collet insertion hole.

  The rear collet 7 is provided with an electrode insertion hole through which the non-consumable electrode 3 is inserted in the shaft core portion, a tapered portion is formed at the tip portion, and a vertical axis (not shown) extending from the tip portion along the electrode insertion hole is omitted. A slot is formed. The rear collet body 8 is provided with a rear collet insertion hole in the shaft core portion. Further, the rear collet body 8 has a taper taper portion that is in contact with the taper taper portion of the rear collet 7 formed on the inner surface of the front end portion and is inserted into the rear collet body insertion hole of the torch body 6. The distal end is in contact with the proximal end of the front collet 2.

  The rear collet retainer 9 is screwed into the proximal end portion of the rear collet body 8, and the distal end portion of the rear collet retainer 9 is in contact with the proximal end portion of the rear collet 7 via the spring 10. By screwing the rear collet presser 9 into the base end portion of the rear collet body 8, the tapered portion of the rear collet 7 is pressed in contact with the tapered portion of the rear collet body 8 so that the rear collet 7 is vertically slit. Is tightened. As a result, the non-consumable electrode 3 is held at a predetermined position.

  The front collet presser 11 has an insertion hole for the rear collet presser 9 formed in the shaft core portion. The base end portion of the rear collet body 8 is screwed and held inside the front collet presser 11, and the front collet presser 11 is screwed to the outer periphery of the base end portion of the torch body 6 in this state. That is, the front collet presser 11 is formed in a cap nut shape in which the screw portion does not protrude. As a result, when the front collet presser 11 is screwed in the X2 direction with respect to the base end portion of the torch body 6, the rear collet body 8 presses the front collet 2, and the tapered portion of the front collet 2 is the tapered taper of the front collet body 4. The vertical collet of the front collet 2 is tightened by being pressed in contact with the part. As a result, the non-consumable electrode 3 is held at a predetermined position.

  The nozzle 12 surrounds the front collet body 4 and is attached to the tip of the torch body 6. A plurality of shield gases supplied from a gas cylinder (not shown) pass through the torch body 6, pass between the front collet 2 and the front collet body 4, and are formed at the front end of the front collet body 4. From the shield gas hole 5 to the inner surface of the nozzle 12. Then, a shielding gas is ejected from the nozzle 12 to shield the arc and molten pool generated at the tip of the non-consumable electrode 3 from the air.

  At the time of welding, electric power supplied from a welding power supply device (not shown) flows through the torch body 6, the front collet body 4, and the front collet 2 and is supplied to the non-consumable electrode 3. Usually, the front collet 2 and the front collet body 4 are in contact with each other only at the tip portions and are supplied with power. (For example, refer to Patent Document 1).

  The operation will be described below. In FIG. 2, the front collet 2 is inserted into a front collet insertion hole of the front collet body 4, and the front collet body 4 is screwed into the tip of the torch body 6. The rear collet 7 is inserted into the rear collet insertion hole of the rear collet body 8, and the rear collet body 8 is inserted into the rear collet body insertion hole of the torch body 6, and the tip of the rear collet body 8 is inserted. The portion is in contact with the base end portion of the front collet 2.

  Then, by screwing the rear collet presser 9 into the base end portion of the rear collet body 8, the tapered portion of the rear collet 7 is pressed in contact with the tapered portion of the rear collet body 8. The slot is tightened, and the non-consumable electrode 3 is held in a predetermined position. Further, by screwing the front collet presser 11 into the base end portion of the torch body 6, the rear collet body 8 presses the front collet 2, and the tapered portion of the front collet 2 is brought into the tapered portion of the front collet body 4. The contact is pressed and the front slit of the front collet 2 is tightened, and the non-consumable electrode 3 is held at a predetermined position.

  The shield gas is supplied to the torch body 6 from a gas cylinder (not shown), and electric power is supplied from a welding power supply device (not shown) to perform TIG welding. When the non-consumable electrode 3 is consumed and replaced, the front collet retainer 11 is loosened and removed from the torch body 6 without loosening the rear collet retainer 9, so that the front collet retainer 11, rear collet body 8, rear The collet 7, the non-consumable electrode 3, and the rear collet retainer 9 can be taken out from the base end side of the torch body 6 as a unit. Therefore, for example, when the TIG welding torch 1 is attached to the tip of the manipulator of the welding robot, the TIG welding torch 1 is moved rearward when an object to be welded exists in front of the TIG welding torch 1. Without replacement, the non-consumable electrode 3 can be easily replaced.

Japanese Patent Publication No. 61-16556

  The above-described conventional TIG welding torch 1 has a structure in which the front collet 2 is pressed against the front collet body 4 via the rear collet body 8 by screwing the front collet presser 11. For this purpose, the front collet holder 11 is screwed so that the front collet holder 11 can continue to be screwed after the front collet 2 reaches a pressure at which the non-consumable electrode 3 can be appropriately held. If the front collet presser 11 is screwed in to a pressure that can properly hold the front collet body 4, the front collet body 4 is pressed by the front collet 2 with an excessive pressure. On the other hand, a shield gas hole 5 is formed at the front end of the front collet body 4, and this portion is easily softened because of the large influence of arc heat. Therefore, there is a problem that the stress is concentrated in the shield gas hole 5 and the front collet body 4 is broken at this portion.

  An object of the present invention is to provide a welding torch in which a front collet body is not pressed by an excessive pressure by a front collet.

The first invention is
Torch body,
Front collet body screwed into the tip of this torch body,
A front collet for holding a non-consumable electrode with a tip portion pressed against the inner surface of the front collet body;
A rear collet body that is inserted from the base end side of the torch body, and a tip part abuts on the base end part of the front collet;
A rear collet that holds the non-consumable electrode by screwing a rear collet press provided on the base end side of the torch body, so that the tip is pressed against the inner surface of the rear collet body;
A front collet press screwed into the base end of the torch body;
In the TIG welding torch in which the rear collet body holds the non-consumable electrode by pressing the front collet by screwing the front collet press,
A spring for a front collet provided between the front collet presser and the rear collet body and inserted into the torch body;
A proximal end is attached to the rear collet retainer, and a distal end is inserted through the front collet retainer and the front collet spring and screwed into the proximal end of the rear collet body, and then the proximal end of the rear collet A sleeve that is in contact with the portion and has an insertion hole for the non-consumable electrode;
A protrusion formed around the front collet retainer and abutting against the base end of the torch body;
The front collet presser is screwed in so that the protrusion comes into contact with the base end of the torch body, the front collet spring presses the rear collet body, and the rear collet body presses the front collet. The TIG welding torch is characterized in that the spring force of the front collet spring is set in advance so that the front end portion of the front collet holds the non-consumable electrode.

  In the TIG welding torch of the present invention, when the front collet presser is screwed, the front collet does not excessively press the front end of the front collet body. Therefore, even if the front end portion of the front collet body is softened due to the influence of arc heat, the stress is not concentrated in the shield gas hole, so that the front collet body is not broken at this portion.

It is sectional drawing of the TIG welding torch of this invention. It is sectional drawing of the conventional TIG welding torch.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 1 is a cross-sectional view of a TIG welding torch 20 of the present invention. In the figure, the same functions as those of the conventional TIG welding torch 1 shown in FIG. 2 are denoted by the same reference numerals, description of those functions and operations is omitted, and different from the conventional TIG welding torch 1 hereinafter. Explain the function.

  The front end of the torch body 21 is formed with a front collet body insertion hole into which a later-described front collet body 28 is screwed, and the rear end is formed with a rear collet body insertion hole into which a later-described rear collet body 22 is inserted. Is formed. The rear collet body insertion hole is formed up to the vicinity of the base end of the front collet body insertion hole, and a front collet body insertion hole and a rear collet body insertion hole, which will be described later. A front collet insertion hole through which the collet 27 is inserted is formed.

  The front collet body 28 is provided with a front collet insertion hole in the shaft core portion, and a plurality of shield gas holes 32 are formed in the tip portion. Further, the front collet body 28 has a taper taper portion which is in contact with the taper taper portion of the front collet 27 on the inner surface of the front end portion, and is attached to the front end portion of the torch body 21. The base end portion of the front collet 27 is inserted into the rear collet body insertion hole through the front collet insertion hole.

  The rear collet 26 is provided with an electrode insertion hole through which the non-consumable electrode 3 is inserted in the shaft core portion, a tapered portion is formed at the distal end portion, and a vertical axis (not shown) extending from the distal end along the electrode insertion hole is omitted. A slot is formed. The rear collet body 22 is provided with a rear collet insertion hole in the shaft core portion. Further, the rear collet body 22 is formed with a tapered portion that is in contact with the tapered portion of the rear collet 26 on the inner surface of the distal end portion, and is inserted into the rear collet body insertion hole formed in the shaft core portion of the torch body 21. Thus, the distal end portion of the rear collet body 22 is in contact with the proximal end portion of the front collet 27.

  A rear collet body 22 is inserted into a rear collet body insertion hole of the torch body 21, and a front collet spring 23 is inserted through a spring receiver 25 at a base end portion thereof. The front collet retainer 24 is screwed into the proximal end portion of the torch body 21, the distal end portion of the front collet retainer 24 abuts on the proximal end portion of the front collet spring 23, and the distal end portion of the front collet spring 23 is a spring receiver. 25 abuts against the base end of the rear collet body 22. The front end of the rear collet body 22 abuts on the base end of the front collet 27, and the front end of the front collet 27 is pressed against the inner surface of the front end of the front collet body 28 to hold the non-consumable electrode 3. ing. The tip of the rear collet 26 is pressed against the inner surface of the tip of the rear collet body 22 to hold the non-consumable electrode 3.

  The sleeve 29 has a non-consumable electrode insertion hole formed in the shaft core portion, and a base end portion of the sleeve 29 is attached to the rear collet presser 30. The front end of the sleeve 29 is inserted through the front collet retainer 24 and the front collet spring 23 and screwed into the base end of the rear collet body 22. Further, the distal end portion of the sleeve 29 is in contact with the proximal end portion of the rear collet 26. In addition, a protrusion 31 is provided around the front collet retainer 24 so as to contact the base end of the torch body 21. The rear collet retainer 30 is not screwed into the front collet retainer 24.

  The spring force of the front collet spring 23 is set in advance corresponding to the diameter of the non-consumable electrode 3, and the front collet retainer 24 is screwed so that the protrusion 31 of the front collet retainer 24 is the base end of the torch body 21. , The rear collet body 22 presses the front collet 27 by the spring force of the front collet spring 23, and the front collet 27 holds the non-consumable electrode 3 at an appropriate pressure. Shield gas is supplied from the shield gas supply port 33, and power is supplied from the power supply port 34.

  Hereinafter, the operation of functions different from the conventional technology will be described. First, the front collet 27 is inserted into the front collet body 28, and the front collet body 28 is screwed to the tip of the torch body 21. Next, the non-consumable electrode 3 is inserted into the rear collet 26, the rear collet 26 is inserted into the rear collet body 22, and the front end of the sleeve 29 is connected to the front collet press 24, the front collet spring 23, and the spring receiver 25. And is screwed into the rear collet body 22. Then, the length of the non-consumable electrode 3 protruding from the tip of the rear collet body 22 is set, and the rear collet press 30 is screwed in so that the sleeve 29 attached to the rear collet press 30 presses the rear collet 26. Thus, the diameter of the tip is reduced, and the tip of the rear collet 26 holds the non-consumable electrode 3.

  The front collet retainer 24, the front collet spring 23, the sleeve 29, the rear collet retainer 30, the rear collet body 22, the rear collet 26, and the non-consumable electrode 3 are integrated (hereinafter referred to as the rear collet body 22 or the like). .) Is inserted from the base end of the torch body 21, and the front end of the non-consumable electrode 3 is inserted through the front collet 27. Then, the front collet retainer 24 is screwed, the front collet retainer 24 presses the rear collet body 22 via the front collet spring 23 and the spring receiver 25, and the rear collet body 22 presses the front collet 27, The front collet 27 is pressed by the front collet body 28, and the tip of the front collet 27 is reduced in diameter. Subsequently, the front collet retainer 24 is screwed in until the protrusion 31 of the front collet retainer 24 abuts and engages with the proximal end portion of the torch body 21. In this state, the front collet 27 holds the non-consumable electrode 3 with an appropriate pressure.

  As a result, in the TIG welding torch 20 of the present invention, when the spring force of the front collet spring 23 is preset corresponding to the diameter of the non-consumable electrode 3 and the front collet presser 24 is screwed in, the front collet Since the protrusion 31 of the presser 24 is locked to the base end of the torch body 21 and the front collet 27 does not screw in the front collet presser 24 beyond the pressure that can properly hold the non-consumable electrode 3, the front collet 27, the front end of the front collet body 28 is not excessively pressed. For this reason, even if the front end portion of the front collet body 28 is softened due to the influence of arc heat, the stress is not concentrated in the shield gas hole 32, so that the front collet body 28 is not broken at this portion.

  Furthermore, the rear collet body 22 and the like can be pulled out from the base end side of the torch body 21 by inserting the sleeve 29 through the front collet retainer 24, the front collet spring 23 and the spring receiver 25 and screwing into the rear collet body 22. For example, when the TIG welding torch 20 is attached to the tip of the manipulator of the welding robot, the TIG welding torch 20 is moved to the base end side when an object to be welded exists in front of the TIG welding torch 20. Since the rear collet body 22 and the like can be taken out from the base end side of the TIG welding torch 20 without replacement, the non-consumable electrode 3 can be easily replaced.

1 TIG welding torch 2 Front collet 3 Non-consumable electrode 4 Front collet body 5 Shield gas hole 6 Torch body 7 Rear collet 8 Rear collet body 9 Rear collet presser 10 Spring 11 Rear collet body 12 Nozzle 20 Tig welding torch 21 Torch body 22 Rear Collet body 23 Front collet spring 24 Front collet retainer 25 Spring receiver 26 Rear collet 27 Front collet 28 Front collet body 29 Sleeve 30 Rear collet retainer 31 Projection 32 Shield gas hole 33 Shield gas supply port 34 Power supply port

Claims (1)

Torch body,
Front collet body screwed into the tip of this torch body,
A front collet for holding a non-consumable electrode with a tip portion pressed against the inner surface of the front collet body;
A rear collet body that is inserted from the base end side of the torch body, and a tip part abuts on the base end part of the front collet;
A rear collet that holds the non-consumable electrode by screwing a rear collet press provided on the base end side of the torch body, so that the tip is pressed against the inner surface of the rear collet body;
A front collet press screwed into the base end of the torch body;
In the TIG welding torch in which the rear collet body holds the non-consumable electrode by pressing the front collet by screwing the front collet press,
A spring for a front collet provided between the front collet presser and the rear collet body and inserted into the torch body;
A proximal end is attached to the rear collet retainer, and a distal end is inserted through the front collet retainer and the front collet spring and screwed into the proximal end of the rear collet body, and then the proximal end of the rear collet A sleeve that is in contact with the portion and has an insertion hole for the non-consumable electrode;
A protrusion formed around the front collet retainer and abutting against the base end of the torch body;
The front collet presser is screwed in so that the protrusion comes into contact with the base end of the torch body, the front collet spring presses the rear collet body, and the rear collet body presses the front collet. The TIG welding torch is characterized in that the spring force of the front collet spring is set in advance so that the tip of the front collet holds the non-consumable electrode.

Images