JP5429786B2 - Consumable electrode gas shield arc welding torch - Google Patents

Description

  The present invention relates to an improved consumable electrode gas shielded arc welding torch.

  Today, in order to improve the work efficiency of welding, it is widely performed to automate welding using a welding robot. In this case, a consumable electrode gas shielded arc welding torch (hereinafter referred to as a welding torch) is attached to the wrist of the manipulator of the articulated robot, and a welding wire wound around a wire reel is fed to the welding torch for electric power and shielding. Gas is supplied to the welding torch for welding.

  Since the welding wire fed to the welding torch is usually wound around a wire reel, the welding wire is bent. Since the bending curve of the welding wire is not constant, it is difficult to match the tip position of the welding wire sent from the power feed tip attached to the tip of the welding torch to the desired welding target position.

  In addition, power is supplied to the welding wire when the welding wire comes into internal contact with the power supply tip attached to the tip of the welding torch. If the bending of the welding wire is not constant, the contact point between the welding wire and the power supply tip Is not constant. As a result, the protruding length of the welding wire that is the length from the contact point between the welding wire and the power feed tip to the tip of the welding wire varies. Due to this variation, the resistance heat generation of the protruding length portion of the welding wire varies, and the amount of melting of the welding wire varies. As a result, the arc length varies and a uniform weld bead cannot be formed.

  Therefore, in order to solve the above-described problems, the following forced pressurizing power supply torch has been proposed. FIG. 5 is a cross-sectional view of a prior art welding torch. In the figure, a tip body 3 composed of a first tip body 3a and a second tip body 3b is attached to the tip of the torch body 2 of the welding torch 1 in the wire feeding direction. The chip holder 4 is attached to the part. A heat resistant member 5 is provided at the tip of the chip holder 4. These torch body 2, tip body 3, tip holder 4, and heat-resistant member 5 have wire insertion holes formed in the shaft core portion. In addition, the heat-resistant member 5 described above prevents power supply to the welding wire when the welding wire comes into contact with the wire insertion hole of the chip holder 4.

  A spring 6 is provided inside the torch body 2. The pressure shaft 7 is provided inside the tip body 3, and the proximal end portion of the pressure shaft 7 is in contact with the distal end portion of the spring 6. The spring 6 and the pressure shaft 7 have a wire insertion hole formed in the shaft core portion. A distal end portion of a wire guide liner 14 that guides a welding wire fed from a wire feeding device (not shown) is inserted through the spring 6 and inserted into a proximal end portion of the pressure shaft 7.

  The power feed tip 8 has a wire insertion hole formed in the shaft core portion, and the base end portion of the power feed tip 8 is inserted into the tip end portion of the second tip body 3 b and comes into contact with the tip end portion of the pressure shaft 7. In addition, the tip of the power feed tip 8 is inserted into the tip holder 4. That is, the power feed tip 8 is pressed by the pressure shaft 7 and the tip holder 4. Further, the power supply chip 8 is formed with a vertical slit 9 extending from the tip portion along the wire insertion hole.

  Further, a taper shape 10 is formed on the side surface of the power supply chip 8 so as to contact an inclined surface formed at the base end portion of the chip holder 4. For this reason, since the vertical slit 9 is formed as described above, when the tip of the power feed tip 8 is inserted into the chip holder 4 and the power feed tip 8 is pressed by the pressure shaft 7 and the chip holder 4. The tip of the wire insertion hole 9 of the power feed tip 8 is reduced in diameter, and the inner surface of the wire insertion hole can press the welding wire.

  An orifice 11 is provided below the first tip body 3 a, and a nozzle 12 surrounds the tip holder 4 and the orifice 11. Shielding gas is ejected through the ejection hole of the orifice 11, and this shielding gas shields the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere. An insulating bush 13 is provided around the first chip body 3a. (For example, refer to Patent Document 1).

  The operation will be described below. A tip body 3 is attached to the tip of the torch body 2, and a tip holder 4 is attached to the tip of the tip body 3. Further, the spring 6 is provided inside the torch body 2, the pressure shaft 7 is provided inside the tip body 3, and the base end portion of the pressure shaft 7 is in contact with the distal end portion of the spring 6.

  The base end portion of the power supply chip 8 is provided in the front end portion of the chip body 3, and the front end portion of the power supply chip 8 is inserted into the chip holder 4. At this time, the tapered shape 10 formed on the side surface of the power supply chip 8 is in contact with the inclined surface formed on the base end portion of the chip holder 4. A space 15 is formed between the inner surface of the chip holder 4 and the tip of the power feed chip 8.

  The spring 6 presses the pressure shaft 7, and the power supply chip 8 is pressed by the pressure shaft 7 and the chip holder 4. At this time, since the vertical slit 9 is formed in the power supply tip 8, the inner surface of the wire insertion hole of the power supply tip 8 presses the welding wire. Further, the power supplied to the torch body 2 flows through the chip body 3, flows into the chip holder 4, and power is supplied to the power supply chip 8. Shielding gas is ejected through the ejection hole of the orifice 11, and this shielding gas shields the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere.

International Publication No. WO2008 / 018594A1 Pamphlet

  For example, when the material of the welding wire is changed from iron to aluminum, it is necessary to weaken the applied pressure of the spring 6 in the above-described forced pressurizing power supply torch of the prior art, but since this applied pressure is constant, The pressurizing force is strong with respect to the material of the welding wire, which may reduce the feeding performance. In addition, when the welding posture changes extremely and the feeding resistance in the conduit cable connected to the welding torch increases, it is necessary to weaken the pressure of the spring 6, but the pressure of the spring is constant. In addition, the welding wire could not be stably fed, and an appropriate welding bead could not be formed.

  An object of the present invention is to provide a welding torch capable of stably feeding a welding wire when the material of the welding wire changes or the welding posture changes extremely in a forced pressurizing power supply torch. It is said.

In order to solve the above-described problems, the invention of claim 1
Torch body,
A tip body attached to the tip of the torch body;
A chip holder attached to the tip of the chip body;
Provided between the tip portion of the tip body and the tip holder, a power supply tip having a longitudinal slit extending from the tip portion along the wire insertion hole and having a tapered shape on the side surface;
A spring provided inside the torch body and extending and contracting in the longitudinal axis direction of the torch body;
In the consumable electrode gas shield arc welding torch in which the taper shape of the power feed tip is pressed against the tip holder by the spring force of the spring, and the wire insertion hole of the power feed tip is reduced in diameter to feed the welding wire.
A spring force adjusting means for adjusting the spring force of the spring by changing the length of the spring in the longitudinal axis direction ;
The spring force adjusting means has a wire insertion hole formed in the shaft core portion, a first inclined surface formed in the proximal end portion, and a distal end portion in contact with the proximal end portion of the spring, and the torch body A first pressure member that slides through the wire insertion hole;
It has a U-shape in which an open portion through which a welding wire is inserted is formed at the tip, a second inclined surface is formed on a side surface that is in sliding contact with the first inclined surface, and is formed in the radial direction of the torch body. A second pressure member sliding in the second pressure member movement hole;
Second pressure member moving means for moving the second pressure member in the radial direction of the torch body;
With
Moving the second pressure member in the radial direction of the torch body, the second inclined surface slidingly contacts the first inclined surface, and moving the first pressure member in the longitudinal axis direction; A consumable electrode gas shield arc welding torch, wherein the spring is pressed or loosened to change the length of the spring in the longitudinal axis direction .

The invention of claim 2
The second pressure member moving means according to claim 1, wherein an adjustment screw including a screw portion having a distal end portion attached to a proximal end portion of the second pressure member, and a knob portion;
A screw insertion hole formed in the torch body and corresponding to the screw portion;
The consumable electrode gas shield arc welding torch is characterized in that the second pressure member is moved in the radial direction of the tip body by rotating the knob portion .

  The invention of claim 3
The second pressing member moving means according to claim 1, wherein a cylinder provided in the torch body, a piston moving in the cylinder, a base end portion is attached to the piston, and a tip end portion is the second portion. A cylinder assembly comprising a rod attached to the proximal end of the pressure member;
A rod insertion hole formed in the torch body and through which the rod is inserted;
In the consumable electrode gas shield arc welding torch, the second pressure member is moved in a radial direction of the tip body by moving the rod.

  The welding torch of the present invention rotates the knob part of the adjusting screw when the material of the welding wire changes or when the welding posture changes drastically and the feeding resistance in the conduit cable connected to the welding torch increases or decreases. Since the spring force of the spring can be adjusted to an appropriate pressure by increasing / decreasing the pressure applied to the spring, the welding wire can be stably fed and an appropriate weld bead can be formed. .

It is sectional drawing of the welding torch of Embodiment 1 of this invention. It is a figure explaining operation | movement of the welding torch of Embodiment 1 of this invention. It is sectional drawing of the welding torch of Embodiment 2 of this invention. It is a figure explaining operation | movement of the welding torch of Embodiment 2 of this invention. It is sectional drawing of the welding torch of a prior art.

[Embodiment 1]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the invention will be described based on examples with reference to the drawings. 1 is a cross-sectional view of a welding torch according to a first embodiment of the present invention. In the drawing, the distal end portion of the first pressure member 21 is in contact with the proximal end portion (X2 direction) of the spring 6 of the welding torch 20. The first pressurizing member 21 has a cylindrical shape, a first inclined surface 21a is formed at a base end portion (X2 direction), and a liner insertion hole through which the wire guide liner 14 is inserted into the shaft core portion. Is formed. The first pressing member 21 slides in the wire insertion hole of the torch body 2 in the longitudinal axis direction.

  A second pressure member 22 is provided at a base end portion (X2 direction) of the first pressure member 21, and a side surface of the second pressure member 22 on the first pressure member 21 side (X1 direction). The part is formed with a second inclined surface 22a that is in a shape corresponding to the first inclined surface 21a of the first pressure member 21 and is in sliding contact with the first inclined surface 21a. Moreover, the 2nd pressurization member 22 is formed in the U-shape by which the open part by which the wire guide liner 14 was penetrated was formed in the front-end | tip part (Y1 direction). The second pressure member 22 slides in a second pressure member moving hole 23 formed in the radial direction (Y2 direction) of the torch body 2.

  An adjustment screw 24 including a screw portion 24a and a knob portion 24b is provided in the torch body 2, and a screw portion insertion hole 25 corresponding to the screw portion 24a is formed in the torch body 2. And the front-end | tip part of the thread part 24a is attached to the base end part of the 2nd pressurization member 22, and the 2nd pressurization member 22 is the radial direction (Y1-Y2) of the torch body 2 by rotating the knob part 24b. Direction). For other functions, the same reference numerals are given to the same functions of the welding torch of the prior art shown in FIG.

  The operation will be described below with reference to FIG. FIG. 2 is a diagram for explaining the operation of the welding torch according to the first embodiment of the present invention. As shown in FIG. 2A, the distal end portion (X1 direction) of the first pressure member 21 is in contact with the proximal end portion (X2 direction) of the spring 6, and the proximal end portion of the first pressure member 21 A first inclined surface 21a is formed in the portion (X2 direction), and a liner insertion hole is formed in the shaft core portion. The first pressure member 21 slides in the wire insertion hole of the torch body 2.

  A second pressure member 22 is provided at a base end portion (X2 direction) of the first pressure member 21, and a side surface of the second pressure member 22 on the first pressure member 21 side (X1 direction). The part is formed with a second inclined surface 22a slidably contacting the first inclined surface 21a. The second pressure member 22 slides in a second pressure member moving hole 23 formed in the radial direction (Y2 direction) of the torch body 2. An adjustment screw 24 is provided on the torch body 2, and a distal end portion (Y1 direction) of the screw portion 24 a is attached to a proximal end portion (Y2 direction) of the second pressure member 22.

  As shown in FIG. 2 (B), by screwing the knob portion 24b of the adjusting screw 24, the second pressure member 22 is slid in the second pressure member movement hole 23 so that the Y1 in the radial direction of the torch body 2 is shown. The second inclined surface 22a of the second pressure member 22 is slidably brought into contact with and pressed against the first inclined surface 21a of the first pressure member 21. As a result, the first pressure member 21 is moved in the X1 direction of the longitudinal axis direction of the torch body 2, and the first pressure member 21 presses the spring 6 so that the longitudinal axis direction of the spring 6 (X1-X2). (Direction) is shortened, and the applied pressure of the spring 6 can be increased.

  On the contrary, as shown in FIG. 2C from the state shown in FIG. 2A, the second pressurizing member 22 is subjected to the second pressurization by loosening the knob portion 24b of the adjusting screw 24. The member moving hole 23 is slid and moved in the Y2 direction in the radial direction of the torch body 2. As a result, the pressing force of the first inclined surface 21 a of the first pressure member 21 by the second inclined surface 22 a of the second pressure member 22 decreases, and the first pressure member 21 is torched by the spring force of the spring 6. Returning to the X2 direction of the longitudinal axis of the body 2, the pressing force of the spring 6 by the first pressure member 21 decreases. For this reason, the length in the longitudinal axis direction (X1-X2 direction) of the spring 6 is extended, and the pressing force of the spring 6 can be reduced. The operation of the other functions is the same as the operation of the same function of the conventional welding torch shown in FIG.

  As a result, for example, when the material of the welding wire changes, or when the welding posture changes extremely and the feeding resistance in the conduit cable connected to the welding torch increases or decreases, the knob portion 24b of the adjusting screw 24 is rotated. Since the spring force of the spring 6 can be adjusted to an appropriate pressure by increasing / decreasing the pressure applied to the spring 6, the welding wire can be stably fed and an appropriate weld bead can be formed. Can do.

  Further, the wire insertion hole of the power feed tip 8 may be worn by the welding wire, and the diameter of the wire insertion hole may increase. In this case, the adjustment screw 24 is screwed in to increase the pressure applied to the spring 6 and the spring force of the spring 6 can be adjusted to an appropriate pressure, so that the welding wire can be stably fed and A weld bead can be formed.

  Further, at the time of feeding the welding wire, the welding wire is fed to the power feed tip 8 by being guided by the wire guide liner 14 from a wire feeding device (not shown). At this time, friction is generated in the welding wire. Due to this friction, the surface of the welding wire is damaged and, in some cases, is scraped, and at this time, shavings are generated. The shavings are fed to the tip of the power feed tip 8 through the wire guide liner 14. Usually, the gap between the wire insertion hole of the power feed tip 8 and the welding wire is, for example, about 0.1 mm, and there is almost no gap. Therefore, when this cutting powder enters the wire insertion hole of the power feed tip 8, the feeding resistance increases.

  In this case, the adjusting screw 24 can be loosened to reduce the pressure applied to the spring 6 and the spring force of the spring 6 can be adjusted to an appropriate pressure, so that the welding wire can be fed stably, A weld bead can be formed.

  Note that a motor and a speed reducer may be provided on the adjustment screw 24 described above, and the adjustment screw 24 may be rotated electrically.

[Embodiment 2]
FIG. 3 is a cross-sectional view of the welding torch according to the second embodiment of the present invention. In the figure, instead of the adjusting screw 24 shown in FIG. 1, a cylinder assembly 31 is provided in the torch body 2 of the welding torch 30, and the cylinder assembly 31 moves within the cylinder 32 and the cylinder 32. It consists of a piston and a rod 33 having a base end (Y2 direction) attached to the piston. The cylinder 32 is attached to the torch body 2, and the distal end portion (Y1 direction) of the rod 33 is attached to the proximal end portion (Y2 direction) of the second pressure member 22. A rod insertion hole 34 through which the rod 33 is inserted is formed in the torch body 2. For the other functions, the same reference numerals are given to the same functions of the welding torch according to the first embodiment of the present invention shown in FIG.

  The operation will be described below with reference to FIG. FIG. 4 is a diagram for explaining the operation of the welding torch according to the second embodiment of the present invention. As shown in FIG. 2A, the cylinder 32 of the cylinder assembly 31 is attached to the torch body 2, and the distal end portion (Y1 direction) of the rod 33 is attached to the proximal end portion (Y2 direction) of the second pressure member 22. It has been. A rod insertion hole 34 through which the rod 33 is inserted is formed in the torch body 2. Compressed air supplied from an air compressor (not shown) is supplied to the cylinder 32, and the rod 33 slides in the rod insertion hole 34 in the Y1 direction in the radial direction of the torch body 2 as shown in FIG. The second pressure member 22 is slid in the second pressure member moving hole 23 and moved in the radial direction Y1 of the torch body 2. As a result, the first pressure member 21 presses the spring 6 and the length of the spring 6 in the longitudinal axis direction (X1-X2 direction) of the torch body 2 is shortened to increase the pressure applied to the spring 6. Can do.

  On the contrary, as shown in FIG. 3C, the rod 33 is slid in the rod insertion hole 34 and moved in the Y2 direction in the radial direction of the torch body 2, and the second pressure member 22 is moved to the second direction. The pressure member moving hole 23 is slid to move in the radial direction Y2 of the torch body 2. As a result, the pressing force of the first inclined surface 21 a of the first pressure member 21 by the second inclined surface 22 a of the second pressure member 22 is reduced, and the first pressure member 21 is elongated by the spring force of the spring 6. Returning to the X2 direction of the axial direction, the pressing force of the spring 6 by the first pressure member 21 decreases. For this reason, the length in the longitudinal axis direction (X1-X2 direction) of the spring 6 is extended, and the pressing force of the spring 6 can be reduced. Other operations and effects are the same as those of the welding torch according to the first embodiment of the present invention shown in FIG.

DESCRIPTION OF SYMBOLS 1 Welding torch 2 Torch body 3 Tip body 3a 1st tip body 3b 2nd tip body 4 Tip holder 5 Heat-resistant member 6 Spring 7 Pressure shaft 8 Feeding tip 9 Wire insertion hole 10 Taper shape 11 Orifice 12 Nozzle 13 Insulation bush 14 Wire guide liner 15 Space 20 Welding torch 21 First pressure member 21a First inclined surface 22 Second pressure member 22a Second inclined surface 23 Pressure member moving hole 24 Adjustment screw 24a Screw portion 24b Knob portion 25 Screw portion insertion Hole 30 Welding torch 31 Cylinder assembly 32 Cylinder 33 Rod 34 Rod insertion hole

Claims (3)

Torch body,
A tip body attached to the tip of the torch body;
A chip holder attached to the tip of the chip body;
Provided between the tip portion of the tip body and the tip holder, a power supply tip having a longitudinal slit extending from the tip portion along the wire insertion hole and having a tapered shape on the side surface;
A spring provided inside the torch body and extending and contracting in the longitudinal axis direction of the torch body;
In the consumable electrode gas shield arc welding torch in which the taper shape of the power feed tip is pressed against the tip holder by the spring force of the spring, and the wire insertion hole of the power feed tip is reduced in diameter to feed the welding wire.
A spring force adjusting means for adjusting the spring force of the spring by changing the length of the spring in the longitudinal axis direction ;
The spring force adjusting means has a wire insertion hole formed in the shaft core portion, a first inclined surface formed in the proximal end portion, and a distal end portion in contact with the proximal end portion of the spring, and the torch body A first pressure member that slides through the wire insertion hole;
It has a U-shape in which an open portion through which a welding wire is inserted is formed at the tip, a second inclined surface is formed on a side surface that is in sliding contact with the first inclined surface, and is formed in the radial direction of the torch body. A second pressure member sliding in the second pressure member movement hole;
Second pressure member moving means for moving the second pressure member in the radial direction of the torch body;
With
Moving the second pressure member in the radial direction of the torch body, the second inclined surface slidingly contacts the first inclined surface, and moving the first pressure member in the longitudinal axis direction; A consumable electrode gas shield arc welding torch characterized in that the spring is pressed or loosened to change the length of the spring in the longitudinal axis direction . The second pressure member moving means according to claim 1, wherein an adjustment screw including a screw portion having a distal end portion attached to a proximal end portion of the second pressure member, and a knob portion;
A screw insertion hole formed in the torch body and corresponding to the screw portion;
A consumable electrode gas shield arc welding torch characterized in that the second pressure member is moved in the radial direction of the tip body by rotating the knob portion. The second pressing member moving means according to claim 1, wherein a cylinder provided in the torch body, a piston moving in the cylinder, a base end portion is attached to the piston, and a tip end portion is the second portion. A cylinder assembly comprising a rod attached to the proximal end of the pressure member;
A rod insertion hole formed in the torch body and through which the rod is inserted;
A consumable electrode gas shield arc welding torch, wherein the second pressure member is moved in the radial direction of the tip body by moving the rod.

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