JP2021176644A - Electric power supply chip and welding torch - Google Patents

Abstract

To provide an electric power supply tip for a welding torch, which is suitable for supplying electric power to a welding wire more stably and reliably.SOLUTION: An electric power supply chip 6 includes: a base chip 61 having: a cylindrical part 612 having a wire insertion hole along an axis Ox; and a first extension piece 613 extending from a leading end of the cylindrical part 612 and located below a separation surface S1 including the axis Ox; a pressure chip 62 located above the separation surface S1, having a second extension piece 621 disposed opposite the first extension piece 613 with the separation surface S1 between them, and separable from the base chip 61; and a separation preventing ring 63 that prevents separation of the pressure chip 62. The pressure chip 62 is rotatable around a rotation axis Oy relative to the base chip 61 and includes a lever part 622 located below the separation surface S1, on a basal-end side of the base chip 61 from the rotation axis Oy. The separation preventing ring 63 applies an upward urging force to the lever part 622 from below the separation surface S1.SELECTED DRAWING: Figure 4

Description

The present invention relates to a feeding tip used by attaching to a welding torch, and a welding torch.

For example, a welding torch used in consumable electrode arc welding is configured so that a welding wire is sent out by receiving a power supply from a power feeding tip. The welded wire is passed through a wire insertion hole of the power feeding tip and receives power by contacting the inner surface of the wire insertion hole. As a welding torch configured to more reliably supply power from the power feeding tip to the welding wire in order to perform stable welding, for example, a forced pressure feeding type welding torch as described in Patent Document 1 is used. be.

The welding torch shown in Patent Document 1 is configured so that the feeding tip can be elastically pressed toward the tip of the torch via the pressure shaft. A welding wire supplied through a wire guide liner in a conduit cable is inserted through the pressure shaft, and the welding wire is led out from the tip of the welding torch via a feeding tip. Further, the pressure shaft is housed inside a cylindrical member called a tip body so as to be movable in the axial direction, and is elastically pressed toward the tip of the torch by a coil spring arranged on the proximal end side. A chip holder is attached to the tip of the chip body. A vertical slit is formed at the tip of the feeding tip, and the tip of the feeding tip is inserted into the tip holder. By elastically pressing the feeding tip toward the tip of the torch via the pressure shaft, the wire insertion hole of the feeding tip is forcibly elastically reduced in diameter, and the wire insertion hole comes into contact with the welding wire with a pressing force. As a result, the power supply to the welding wire by the power supply tip can be stabilized.

However, in the welding torch disclosed in Patent Document 1, when dust such as spatter enters between the inner surface of the chip body and the outer surface of the pressure shaft, resistance occurs between the inner surface of the chip body and the outer surface of the pressure shaft. Or scratches. Then, the elastic pressure on the feeding tip via the pressure shaft by the compression coil spring becomes unstable. This impairs the stability of the weld.

Further, in the welding torch having the above configuration, these members cooperate with each other when assembling the tip body, the pressure shaft, the tip holder, and the feeding tip. For this reason, the welding torch itself including these members is a dedicated product, and the structure in the assembled state is also complicated.

Japanese Unexamined Patent Publication No. 2010-214412

The present invention has been conceived under such circumstances, and a main object of the present invention is to provide a power feeding tip for a welding torch, which is suitable for more stable and reliable power feeding to a welding wire. And.

In order to solve the above problems, the following technical means are adopted in the present invention.

The feeding tip provided by the first aspect of the present invention is for a tubular portion having a wire insertion hole formed along an axis and a separation surface extending from the tip of the tubular portion and including the axis. The base chip having the first extension piece located on one side and the first extension piece located on the other side opposite to the one side with respect to the separation surface and sandwiching the separation surface. A pressurizing tip having a second extending piece arranged to face each other and separable from the base tip, and a separation preventing means for preventing the pressurizing tip from separating from the base tip are provided. The compression tip is rotatably combined with the base tip on the base end side of the second extension piece around a rotation axis along the in-plane direction of the separation surface at right angles to the axis. The pressurizing tip includes a lever portion that is closer to the base end side of the base tip than the rotation shaft and is located on one side of the separation surface, and the separation prevention means is provided on the lever portion. On the other hand, it is characterized in that an urging force is applied from the one side to the other side of the separation surface.

In a preferred embodiment, one of the base tip and the pressure tip is formed with a recess extending along the rotation axis, and the other is formed with a protrusion that fits into the recess. ..

In a preferred embodiment, the first distance from the rotation shaft to the position where the lever portion is urged by the separation preventing means in the direction in which the axis extends is the second extension from the rotation shaft. It is greater than the second distance to the tip of one piece.

In a preferred embodiment, the second extension piece and the lever portion are integrally formed of a metal material.

The welding torch provided by the second aspect of the present invention has a tubular torch body, a tubular tip body attached to the tip of the torch body, and a tip of the tip body of the present invention. It is characterized in that it includes a power feeding chip according to the side surface of 1.

According to the feeding tip according to the present invention, the welding wire fed at the time of welding passes between the first extension piece and the second extension piece after passing through the wire insertion hole in the feeding tip. Here, when the lever portion moves to the other side by the urging force from the separation preventing means, the pressure tip rotates around the rotation axis, and the second extension piece moves so as to approach the first extension piece. Then, the welding wire is sandwiched between the first extension piece and the second extension piece, and a pressing force is applied to the welding wire. Therefore, according to the power feeding tip of the present invention, pressure feeding can be performed on the welded wire without using a conventional dedicated part such as a pressure shaft or a tip holder. As a result, the feeding tip can be incorporated into a standard welding torch, and a forced pressure feeding type welding torch can be easily provided at low cost.

Further, the second extension piece of the pressure tip and the lever portion are located on opposite sides of the separating surface including the axis. In addition, the second extension piece and the lever portion are located on opposite sides of the rotation shaft in the extending direction of the axis. The rotating shaft is perpendicular to the axis and runs along the in-plane direction of the separation surface, and the pressure insert can rotate around the rotating shaft. According to the positional relationship between the second extension piece, the lever portion, the separating surface, and the rotating shaft, the force applied to the lever portion by the separation preventing means in the direction approaching the separating surface causes the rotating shaft. As a support shaft, the second extension piece is converted in the direction closer to the first extension piece side of the base chip. Therefore, a pressing force can be appropriately applied to the welding wire passing between the first extension piece and the second extension piece.

Other features and advantages of the present invention will become more apparent with the detailed description given below with reference to the accompanying drawings.

It is a main part vertical sectional view which shows an example of the welding torch which concerns on this invention. It is a perspective view which shows an example of the power feeding chip which concerns on this invention. It is an exploded perspective view of the power feeding chip shown in FIG. It is a front view of the power feeding chip shown in FIG. It is a top view of the power feeding chip shown in FIG. It is sectional drawing which follows the VI-VI line of FIG. FIG. 5 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 5 is a cross-sectional view taken along the line VIII-VIII of FIG. FIG. 5 is a cross-sectional view taken along the line IX-IX of FIG. It is an exploded perspective view which shows the modification of the feeding chip which concerns on this invention. It is a cross-sectional view similar to FIG. 9 of the power feeding chip shown in FIG.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows a welding torch according to an embodiment of the present invention. The welding torch A1 of the present embodiment includes a torch body 1, a tip body 2, an insulating bush 3, an orifice member 4, a nozzle 5, and a feeding tip 6.

The torch body 1 has a cylindrical shape, and a chip body 2 is connected to the tip of the torch body 1. The chip body 2 has a central hole 21 penetrating in the axial direction. The tip body 2 is connected to the tip of the torch body 1 by a screw means 22. The chip body 2 is also made of a conductive metal and receives a welding current from the torch body 1.

The insulating bush 3 is fitted onto the outer surface of the intermediate portion in the longitudinal direction of the chip body 2. The insulating bush 3 is formed of, for example, an insulating member such as a heat-resistant hard resin, and is connected to the chip body 2 by a screw means 31.

The orifice member 4 is fitted onto the outer surface of the tip end portion in the longitudinal direction of the chip body 2. The orifice member 4 is arranged so as to be adjacent to the insulating bush 3 in the longitudinal direction of the chip body 2. The orifice member 4 will be described later.

The power feeding chip 6 is attached to the tip of the chip body 2. As shown in FIGS. 2 to 7, in the present embodiment, the power feeding chip 6 includes a base chip 61, a pressure chip 62, and a separation prevention ring 63.

The base tip 61 has a connecting portion 611, a cylindrical portion 612, and a first extension piece 613. The connecting portion 611 is a portion connected to the tip of the chip body 2 by screwing means. As shown in FIG. 5, the connecting portion 611 is formed with a central hole 611a for passing the welding wire. The center hole 611a has a tapered shape, and the welding wire (not shown) fed to the welding torch A1 is fed to the cylindrical portion 612 side while being centered and guided in the center hole 611a.

The tubular portion 612 is connected to the tip of the connecting portion 611. The tubular portion 612 has a wire insertion hole 612a formed along the axis Ox. The dimension of the tubular portion 612 in the direction along the axis Ox is larger than the dimension of the first extending piece 613 in the direction along the axis Ox, which will be described later. Occupy the majority. As shown in FIG. 3, a mounting groove 612d is formed on the outer peripheral portion of the tubular portion 612 near the base end. The mounting groove 612d is a groove for mounting the separation prevention ring 63, and is formed along the circumferential direction on the outer peripheral portion of the tubular portion 612. The outer peripheral portion of the tubular portion 612 near the tip end has a tapered shape, and is inclined so as to approach the axis Ox toward the tip end side.

As shown in FIGS. 3 and 6, the tip end portion of the tubular portion 612 is inclined so as to intersect the axis line Ox, and a recess 612b is formed in the inclined portion. The recess 612b extends in a direction perpendicular to the axis Ox and has a substantially semicircular cross section.

As shown in FIGS. 3, 7, and 8, a notch portion 612c is formed in the cylindrical portion 612. The notch portion 612c has a shape obtained by cutting a part of the lower part in the drawing from a substantially cylindrical shape. The notch portion 612c is formed over a wide range in the direction along the axis Ox of the tubular portion 612.

The first extending piece 613 extends in the direction in which the axis Ox extends from the tip of the cylindrical portion 612. The first extending piece 613 extends from a region of about half in the circumferential direction of the tubular portion 612. Although the details will be described later, the second extension piece 621 of the pressurizing tip 62 is arranged to face the first extension piece 613. The first extension piece 613 has a substantially semicircular cross section, and has an inner portion 613a facing the second extension piece 621 and an outer circumference facing the inner portion 613a on the side opposite to the second extension piece 621. It has a part 613b and. The inner portion 613a is flat. The outer peripheral portion 613b has a tapered shape and is inclined so as to approach the axis Ox toward the tip.

A first concave groove 613c is formed in the inner portion 613a of the first extension piece 613. The first concave groove 613c extends along the axis Ox and is connected to and extends from the wire insertion hole 612a of the cylindrical portion 612. In the present embodiment, the first concave groove 613c is formed over the entire length of the first extension piece 613 in the longitudinal direction (direction in which the axis Ox extends). In the present embodiment, the cross-sectional shape of the first concave groove 613c is semicircular.

As shown in FIG. 2, the pressurizing tip 62 has a second extension piece 621, a lever portion 622, and a connecting portion 623. The second extension piece 621 is located on the tip end side of the power feeding tip 6, and extends in the direction in which the axis Ox extends. The second extension piece 621 is arranged so as to face the first extension piece 613 of the base chip 61 with the separation surface S1 interposed therebetween. The separation surface S1 is a virtual plane including the axis Ox. As shown in FIGS. 2 and 6, the first extension piece 613 of the base chip 61 is located at the lower side (one side) in the drawing with respect to the separation surface S1, and the second extension piece 621 is the separation surface S1. It is located above in the figure (on the other side opposite to one side). The pressurizing tip 62 is separable from the base tip 61, as shown in FIG.

The second extension piece 621 has a substantially semicircular cross section, and has an inner portion 621a facing the first extension piece 613 and an outer circumference facing the inner portion 621a on the side opposite to the first extension piece 613. It has a part 621b and. The inner portion 621a is flat and faces the inner portion 613a of the first extension piece 613 at a predetermined distance. The outer peripheral portion 621b has a tapered shape and is inclined so as to approach the axis Ox toward the tip end.

A second concave groove 621c is formed in the inner portion 621a of the second extension piece 621. The second concave groove 621c extends in the longitudinal direction of the second extension piece 621. In the present embodiment, the second concave groove 621c is formed over the entire length of the second extension piece 621 in the longitudinal direction (direction in which the axis Ox extends). In the present embodiment, the cross-sectional shape of the second concave groove 621c is semicircular.

In the present embodiment, the base end portion of the second extension piece 621 is inclined so as to face the tip inclined portion of the tubular portion 612 at a distance, and a protrusion 621d is formed on the inclined portion. The protrusion 621d protrudes from the base end inclined portion of the second extension piece 621. The protrusion 621d extends in a direction perpendicular to the axis Ox, and has a substantially semicircular cross section. The protrusion 621d fits into the recess 612b of the tubular portion 612.

The lever portion 622 is connected to the base end portion of the second extension piece 621 via a connecting portion 623. In the present embodiment, the lever portion 622 is elongated in the direction in which the axis Ox extends. As can be seen from FIGS. 3 and 8, the lever portion 622 is housed in the notch portion 612c of the cylindrical portion 612. The lever portion 622 is located on the lower side (one side) in the drawing with respect to the separation surface S1. As shown in FIG. 8, the inner side surface 622a of the lever portion 622 facing to the right in the drawing is in contact with the cylindrical portion 612. On the other hand, the inner side surface 622b of the lever portion 622 facing upward in the drawing is separated from the cylindrical portion 612 by a predetermined distance.

In the present embodiment, a mounting groove 622c is formed on the outer peripheral portion of the lever portion 622 near the base end. The mounting groove 622c is a groove for mounting the separation prevention ring 63, and is formed along the circumferential direction on the outer peripheral portion of the lever portion 622.

As shown in FIGS. 2 and 3, in the present embodiment, the connecting portion 623 connects the second extension piece 621 and the lever portion 622. As shown in FIG. 7, the connecting portion 623 is housed in the notch portion 612c of the cylindrical portion 612. Further, as can be understood from FIGS. 2 and 7, the communication unit 623 intersects the separation surface S1.

In the present embodiment, the second extension piece 621, the lever portion 622, and the connecting portion 623 of the pressure tip 62 are integrally formed of a conductive metal material. The method for integrally forming the pressure tip 62 (second extension piece 621, lever portion 622, and connecting portion 623) is not particularly limited, and examples thereof include cutting, laminating molding with a 3D printer, forging, and casting. Be done.

In the present embodiment, the base tip 61 and the pressure tip 62 are made of the same conductive metal material. The material of the base chip 61 and the pressure chip 62 is not particularly limited, and examples thereof include an alloy containing copper and chromium (chromium copper). The base tip 61 and the pressure tip 62 are more conductive than the welding wire.

The separation prevention ring 63 prevents the pressurizing tip 62 from separating from the base tip 61, and maintains a state in which the pressurizing tip 62 is combined with the base tip 61. In the present embodiment, the separation prevention ring 63 is a substantially annular metal elastic ring. The separation prevention ring 63 is notched at one point in the circumferential direction, and when the separation prevention ring 63 is attached, the first extension piece 613 and the second extension piece 621 are cut out from the tip end side toward the base end. It is fitted onto these outer peripheral portions 613b and 621b and pushed in. As a result, the separation prevention ring 63 passes through the outer peripheral portions of the cylindrical portion 612 and the lever portion 622 while expanding its diameter, and is mounted in the mounting grooves 612d and 622c formed in these outer peripheral portions.

In the present embodiment, the recess 612b and the protrusion 621d fitted therein extend in a direction perpendicular to the axis Ox, and have a substantially semicircular cross section. As a result, the pressurizing tip 62 can rotate around the rotation axis Oy (perpendicular to the axis Ox) if not constrained by the separation prevention ring 63 (see FIGS. 5 to 7). The rotation axis Oy is parallel to the separation surface S1 and extends along the in-plane direction of the separation surface S1. Here, the term "right angle" with respect to the axis Ox with respect to the rotation axis Oy is not limited to the case where it is exactly at a right angle, but also includes the case where there is an error to the extent that it is acceptable in manufacturing. Further, the fact that the rotation axis Oy is "parallel to the separation surface S1" and "along the in-plane direction of the separation surface S1" also include cases where there is an error to the extent acceptable in manufacturing.

When the separation prevention ring 63 is attached, the separation prevention ring 63 is attached to the lever portion 622 from the lower part (one side) in the drawing to the upper part (the other side) in the separation surface S1 shown in FIGS. 4 and 8. Give a boost towards. The lever portion 622 is located on the base end side of the base tip 61 with respect to the rotation shaft Oy and is located on the lower side (one side) in the drawing with respect to the separation surface S1. The second extension piece 621 is located above (the other side) in the drawing with respect to the separation surface S1. As a result, when the pressurizing tip 62 rotates around the rotation shaft Oy and the lever portion 622 moves upward in the drawing (indicated by the arrow N1 in FIG. 4), the lever portion 622 is referred to as the rotation shaft Oy. The second extension piece 621 on the opposite side moves toward the lower part of the figure (indicated by the arrow N2 in FIG. 4) so as to approach the first extension piece 613. The separation prevention ring 63 corresponds to an example of the separation prevention means referred to in the present invention.

In the present embodiment, the distance (first distance L1) from the rotation shaft Oy to the position where the urging force is applied to the lever portion 622 by the separation prevention ring 63 in the direction in which the axis Ox extends is the second extension from the rotation shaft Oy. It is larger than the distance to the tip of the piece 621 (second distance L2) (see FIG. 6). In the example shown in FIG. 6, the first distance L1 may be 1.5 times or more the second distance L2, and the first distance L1 may be twice or more the second distance L2.

As will be understood with reference to FIGS. 6 to 9, the welding wire 9 fed to the welding torch A1 joins the first recessed groove 613c of the first extending piece 613 after passing through the wire insertion hole 612a. It passes between the second recessed grooves 621c of the compression tip 62 (second extension piece 621). At this time, the welding wire 9 is sandwiched in a state of being pressurized by the first extension piece 613 and the second extension piece 621 (first concave groove 613c and second concave groove 621c). As a result, a predetermined sliding resistance acts on the welding wire 9.

As shown in FIG. 1, the nozzle 5 is a cylindrical member that forms an annular space that opens forward on the outside of the chip body 2 or the power feeding chip 6. The base end of the nozzle 5 is connected to the insulating bush 3 by a screwing means 51.

For example, a wire guide liner (not shown) is housed inside the torch body 1 and the chip body 2. The welding wire (not shown) is fed to the welding torch A1 through the wire guide liner. The fed welding wire passes between the inside of the torch body 1, the inside of the tip body 2, the center hole 611a of the power feeding tip 6, the wire insertion hole 612a, the first concave groove 613c and the second concave groove 621c. , Derived from the tip of the feeding tip 6 (first extension piece 613 and second extension piece 621).

The welding torch A1 is also configured so that a shield gas made of an inert gas or the like is ejected from the nozzle 5 at the tip. Specifically, an annular groove 41 is formed on the inner circumference of the orifice member 4 to form an annular space 42 between the annular groove 41 and the outer surface of the chip body 2, and the annular space 42 and the inner space of the nozzle 5 are provided by the orifice hole 43. Communicate. Further, the chip body 2 is formed with a ventilation hole 23 for communicating the central hole 21 and the annular space 42. As a result, the shield gas sent to the welding torch A1 is introduced into the central hole 21 of the chip body 2, and enters the ventilation hole 23, the annular space 42 of the orifice member 4, or the internal space of the nozzle 5 from the orifice hole 43. It is fed and finally ejected from the tip of the nozzle 5.

Next, the operation of this embodiment will be described.

In the present embodiment, as shown in FIGS. 2 to 9, the power feeding chip 6 includes a base chip 61, a pressure chip 62, and a separation prevention ring 63 (separation prevention means). The base tip 61 has a cylindrical portion 612 in which a wire insertion hole 612a is formed, and a first extending piece 613 extending from the tip of the tubular portion 612, and the first extending piece 613 includes an axis Ox. It is located on the lower side (one side) in the figure with respect to the separation surface S1. The pressure tip 62 has a second extension piece 621 located above (the other side) in the drawing with respect to the separation surface S1, and the second extension piece 621 has a first extension piece 621 sandwiching the separation surface S1. It is arranged to face the piece 613. Further, the pressurizing tip 62 is separable from the base tip 61, and the rotation axis Oy (the surface of the separating surface S1 perpendicular to the axis line Ox) is located on the base end side of the second extension piece 621 with respect to the base tip 61. It is rotatably combined around (along the inward direction). Further, the pressurizing tip 62 includes a lever portion 622, and the lever portion 622 is located on the base end side of the base tip 61 with respect to the rotation shaft Oy and below (one side) with respect to the separation surface S1. .. Then, the separation prevention ring 63 is mounted so as to straddle the outer peripheral portion of the tubular portion 612 and the outer peripheral portion of the lever portion 622, and the separation prevention ring 63 is mounted on the separation surface S1 from the lower side (one side) in the drawing to the upper side in the drawing (the other side). Give a boost to the side).

When the feeding tip 6 having such a configuration is used by assembling it to the welding torch A1, the welding wire fed to the welding torch A1 passes through the wire insertion hole 612a in the feeding tip 6 and then is the first extension piece. It passes between 613 and the second extension piece 621. Here, when the lever portion 622 moves upward in the drawing due to the urging force from the separation prevention ring 63, the pressure tip 62 rotates around the rotation axis Oy, and the second extension piece 621 is the first extension piece. It moves closer to 613. Then, the welding wire 9 is sandwiched between the first extension piece 613 and the second extension piece 621, and a pressing force is applied to the welding wire 9. Therefore, according to the power feeding tip 6 of the present embodiment, pressure feeding can be performed on the welding wire without using special parts such as a conventional pressure shaft and a tip holder. As a result, the feeding tip 6 can be incorporated into the standard welding torch A1, and the forced pressure feeding type welding torch A1 can be easily provided at low cost.

Further, the second extension piece 621 of the pressure tip 62 and the lever portion 622 are located on opposite sides of the separation surface S1 including the axis Ox. In addition, the second extension piece 621 and the lever portion 622 are located on opposite sides of the rotation shaft Oy in the extending direction of the axis Ox. The rotation shaft Oy is perpendicular to the axis Ox and is along the in-plane direction of the separation surface S1, and the pressurizing tip 62 can rotate around the rotation shaft Oy. According to the positional relationship between the second extension piece 621, the lever portion 622, the separation surface S1, and the rotation shaft Oy, the direction of approaching the separation surface S1 provided to the lever portion 622 by the separation prevention ring 63. The force is converted in the direction in which the second extension piece 621 approaches the first extension piece 613 side of the base tip 61 with the rotation shaft Oy as a support axis. Therefore, a pressing force can be appropriately applied to the welding wire 9 passing between the first extension piece 613 and the second extension piece 621.

Further, the pressure chip 62 is separable from the base chip 61, and the second extension piece 621 of the pressure chip 62 is arranged to face the first extension piece 613 of the base chip 61. According to such a configuration, it is possible to secure an appropriate gap between the first extension piece 613 and the second extension piece 621 (inner portions 613a, 621a of each other) facing each other. Therefore, even if dust such as spatter generated during welding enters the inside of the power feeding chip 6, the dust is promoted to be discharged from the gap between the first extension piece 613 and the second extension piece 621. As a result, the life of the power feeding chip 6 can be extended.

The tubular portion 612 (base tip 61) is formed with a recess 612b extending along the rotation shaft Oy, and the second extension piece 621 (pressurized tip 62) has a protrusion 621d that fits into the recess 612b. Is formed. According to such a configuration, the pressurizing tip 62 can be appropriately rotated in the circumferential direction around the rotation shaft Oy.

In the present embodiment, the first distance L1 from the rotation shaft Oy to the position where the lever portion 622 is urged by the separation prevention ring 63 in the direction in which the axis Ox extends is the second extension piece 621 from the rotation shaft Oy. It is larger than the second distance L2 to the tip of. According to such a configuration, the force applied to the lever portion 622 is converted into a larger force by the principle of the lever, and the increased force causes the first extension piece 613 and the second extension piece 621 to move between the first extension piece 613 and the second extension piece 621. It is possible to pressurize the passing welding wire 9.

The second extension piece 621 and the lever portion 622 are integrally formed of a metal material. According to such a configuration, the movement of the lever portion 622 is accurately transmitted to the second extension piece 621 with respect to the welding wire 9 passing between the first extension piece 613 and the second extension piece 621. The desired pressurization can be applied.

The first extension piece 613 is formed with a first concave groove 613c extending along the axis Ox, and is formed at a portion (second extension piece 621) of the pressurizing tip 62 facing the first extension piece 613. Is formed with a second concave groove 621c facing the first concave groove 613c. According to such a configuration, the welded wire that has passed through the wire insertion hole 612a of the tubular portion 612 is sent out while being appropriately guided toward the tip of the feeding tip 6. This contributes to the improvement of welding quality.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments, and any modification within the scope of the matters described in each claim is the scope of the present invention. Is included in.

In the above embodiment, the mounting grooves 612d and 622c for mounting the separation prevention ring 63 are formed near the base end of the base tip 61 (cylindrical portion 612). By changing the forming positions of the mounting grooves 612d and 622c, the distance from the fitting portion (rotating shaft Oy) between the recess 612b serving as the support shaft and the protrusion 621d changes, and the feeding tip 6 is added to the welding wire. The pressure can be adjusted. Further, by changing the elastic strength of the separation prevention ring 63, it is possible to easily adjust the pressing force on the welding wire.

In the above embodiment, the separation prevention ring 63 is composed of a metal ring member having a notch at one position, but the present invention is not limited to this. For example, the separation prevention member may be made of an elastic body having endless annular heat resistance.

In the above embodiment, the cross-sectional shape of the first concave groove 613c formed in the first extension piece 613 of the base tip 61 is semicircular, and the cross-sectional shape is formed in the second extension piece 621 of the pressure tip 62. The cross-sectional shape of the second concave groove 621c is semicircular, but the cross-sectional shape is not limited to this. For example, as shown in FIGS. 10 and 11, the cross-sectional shapes of the first concave groove 613c of the base tip 61 and the second concave groove 621c of the pressure tip 62 may be formed in a V shape. Further, the cross-sectional shapes of the first concave groove 613c and the second concave groove 621c may be formed into other shapes different from the semicircular shape and the V shape.

The shape and material of the lever portion 622 and other specific configurations are not limited to the above-described embodiment, and various changes can be made. For example, the lever portion may be formed of a bifurcated spring steel that is separate from the second extension piece 621, and the spring steel may be fixed to the second extension piece 621. The end on the side opposite to the side of the piece 621 may be looped to have a function as a separation preventing means.

A1: Welding torch, 1: Torch body, 2: Tip body, 6: Feed tip, 61: Base tip, 612: Cylindrical part, 612a: Wire insertion hole, 612b: Recess, 613: First extension piece, 62 : Pressurized insert, 621: Second extension piece, 621d: Projection, 622: Lever part, 63: Separation prevention ring (separation prevention means), Ox: Axis line, Oy: Rotating shaft, L1: First distance, L2 : 2nd distance, S1: Separation surface

Claims (5)

A base tip having a tubular portion having a wire insertion hole formed along the axis and a first extending piece extending from the tip of the tubular portion and located on one side of the separation surface including the axis. When,
It has a second extension piece that is located on the other side opposite to the one side with respect to the separation surface and is arranged to face the first extension piece with the separation surface in between, and is from the base chip. With a separable pressure tip,
A separation preventing means for preventing the pressure chip from separating from the base chip is provided.
The pressure tip is rotatably combined with the base tip around a rotation axis along the in-plane direction of the separation surface at right angles to the axis on the base end side of the second extension piece. Ori,
The pressure tip includes a lever portion that is closer to the base end side of the base tip than the rotation shaft and is located on one side of the separation surface.
The separation preventing means is a power feeding tip that gives an urging force from one side to the other side of the separation surface to the lever portion. The first aspect of the present invention, wherein a recess extending along the rotation axis is formed on one of the base tip and the pressure tip, and a protrusion that fits in the recess is formed on the other. Power supply chip. In the direction in which the axis extends, the first distance from the rotating shaft to the position where the urging force is applied to the lever portion by the separation preventing means is the second distance from the rotating shaft to the tip of the second extending piece. The power feeding chip according to claim 1 or 2, which is greater than the distance. The power feeding tip according to any one of claims 1 to 3, wherein the second extension piece and the lever portion are integrally formed of a metal material. Welding comprising a tubular torch body, a tubular tip body attached to the tip of the torch body, and a feeding tip attached to the tip of the tip body according to any one of claims 1 to 4. torch.

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