JP2019025530A - Power feeding chip and welding torch - Google Patents

Abstract

To provide a power feeding chip for a welding torch suitable for more stable and certain power feeding for welding wire.SOLUTION: A power feeding chip 6 comprises: a base chip 61 having a cylindrical part 612 formed a wire insertion hole 612a along an axis Ox and an extension piece 613 extending from the tip of the cylindrical part 612 to the direction of the axis Ox; a compression chip 62 arranged to face to the extension piece 613 across an axis 61 and being separable from the base chip 61; and a separation prevention component 63 mounted on outer periphery 613b of the extension piece 613 and outer periphery 62b of the compression chip 62 to prevent separation of the extension piece 62 from the extension piece 613.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power feed tip used by being attached to a welding torch, and a welding torch.

  For example, a welding torch used in consumable electrode arc welding is configured to receive a power supply from a power supply tip and send out a welding wire. The welding wire is passed through a wire insertion hole of the power supply tip, and receives power supply by contacting the inner surface of the wire insertion hole. As a welding torch configured to perform power supply from the power supply tip to the welding wire more reliably in order to perform stable welding, for example, a forced pressurization power supply type welding torch described in Patent Document 1 is provided. is there.

  The welding torch shown in Patent Document 1 is configured to be able to elastically press the power feed tip toward the tip of the torch via a pressure shaft. A welding wire supplied through a wire guide liner in the conduit cable is inserted through the pressurizing shaft, and the welding wire is led out from the tip of the welding torch through a power feed tip. The pressurizing shaft is housed in a cylindrical member called a tip body so as to be movable in the axial direction, and is elastically pressed toward the tip side of the torch by a coil spring disposed on the base end side. A tip holder is attached to the tip of the tip body. A vertical slit is formed at the tip of the power feed tip, and the tip of the power feed tip is inserted into the chip holder. By pressing the power supply tip elastically toward the tip of the torch via the pressure shaft, the wire insertion hole of the power supply tip is forcibly elastically reduced in diameter, and the wire insertion hole comes into contact with the welding wire with pressure. This stabilizes the power supply to the welding wire by the power supply tip.

  However, in the welding torch disclosed in Patent Document 1, when dust such as spatter enters between the inner surface of the tip body and the outer surface of the pressure shaft, the resistance between the inner surface of the tip body and the outer surface of the pressure shaft is increased. May occur or be scratched. If it does so, the elastic press with respect to the electric power feeding chip | tip via the pressurization shaft by a compression coil spring will become unstable. This hinders welding stability.

  In the welding torch configured as described above, these members cooperate with each other when the tip body, the pressure shaft, the tip holder, and the power feed tip are assembled. For this reason, the welding torch itself including these members is a dedicated product, and the structure of the assembly state is complicated.

JP 2010-214414 A

  The present invention has been conceived under such circumstances, and it is a main object to provide a power supply tip for a welding torch, which is suitable for performing power supply to a welding wire more stably and reliably. And

  In order to solve the above problems, the present invention employs the following technical means.

  The power supply chip provided by the first aspect of the present invention includes a cylindrical portion in which a wire insertion hole is formed along the axis, and an extending piece extending in a direction in which the axis extends from the tip of the cylindrical portion. A base tip, a pressure tip that is disposed opposite to the extension piece across the axis, and can be separated from the base tip, and an outer peripheral portion of the extension piece and an outer peripheral portion of the pressure tip. And a separation preventing member that prevents the pressure tip from separating from the extending piece.

  In a preferred embodiment, one of the base end portion of the extension piece and the base end portion of the pressure tip is formed with a pair of first recesses across the axis, and the other has the above-mentioned A pair of first protrusions that fit into the pair of first recesses are formed.

  In a preferred embodiment, a pair of second recesses are formed on one of the tip of the extension piece and the tip of the pressure tip with the axis interposed therebetween, and the pair of the second pair is formed on the other. A pair of second protrusions that fit into the second recess are formed.

  In a preferred embodiment, the pair of second recesses and the pair of second protrusions are long in the direction in which the axis extends.

  In a preferred embodiment, a first concave groove extending along the axis is formed in a portion of the extension piece that faces the pressure tip, and the pressure tip faces the extension piece. A second groove is formed in the portion to be opposed to the first groove.

  In a preferred embodiment, the separation preventing member is an annular or substantially annular elastic ring, and the extension piece and the pressure tip approach each other when attached to the extension piece and the pressure tip. Energize the direction.

  A welding torch provided by the second aspect of the present invention includes a cylindrical torch body, a cylindrical tip body attached to the tip of the torch body, and a power feed tip attached to the tip of the tip body. The power supply tip includes a cylindrical portion in which a wire insertion hole is formed along an axis, and an extending piece extending in a direction in which the axis extends from the tip of the cylindrical portion. A base chip whose end is attached to the chip body, a pressure chip disposed opposite to the extension piece across the axis, and an outer peripheral portion of the extension piece and an outer peripheral portion of the pressure chip are straddled. And a separation preventing member that prevents the pressure tip from separating from the extending piece.

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

It is a principal part longitudinal cross-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 electric power feeding chip | tip which concerns on this invention. It is a disassembled perspective view of the electric power feeding chip | tip shown in FIG. It is a front view of the electric power feeding chip | tip shown in FIG. It is sectional drawing which follows the VV line of FIG. It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing which follows the VII-VII line of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail 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 power feed tip 6.

  The torch body 1 has a cylindrical shape, and a tip body 2 is connected to the tip of the torch body 1. The chip body 2 has a center hole 21 penetrating in the axial direction. The tip body 2 is connected to the tip of the torch body 1 by screw means 22. The tip 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 on the outer surface of the middle part of the tip body 2 in the longitudinal direction. The insulating bush 3 is formed of an insulating member such as a heat-resistant hard resin, and is connected to the chip body 2 by screw means 31.

  The orifice member 4 is fitted on the outer surface of the tip body 2 in the longitudinal direction. The orifice member 4 is disposed adjacent to the insulating bush 3 in the longitudinal direction of the tip body 2. The orifice member 4 will be further 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 supply chip 6 includes a base chip 61, a pressure chip 62, and a separation preventing member 63.

  The base chip 61 has a connection part 611, a cylindrical part 612, and an extension piece 613. The connection part 611 is a part connected to the tip by the screw means. As shown in FIG. 5, the connection portion 611 is formed with a center hole 611 a for passing a welding wire. The center hole 611a is tapered, and a welding wire (not shown) fed to the welding torch A1 is sent to the cylindrical portion 612 side while being centered and guided in the center hole 611a.

  The cylindrical part 612 is connected to the tip of the connection part 611. The cylindrical portion 612 has a wire insertion hole 612a formed along the axis Ox. The extension piece 613 extends in the direction in which the axis Ox extends from the tip of the connection portion 611. The extending piece 613 extends from an approximately half region in the circumferential direction of the cylindrical portion 612. Although the details will be described later, the pressure chip 62 is disposed to face the extended piece 613. The extending piece 613 has a substantially semicircular cross section, and has an inner portion 613a facing the pressure tip 62, and an outer peripheral portion 613b facing the inner portion 613a opposite to the pressure tip 62. . The inner portion 613a is planar, and the outer peripheral portion 613b is tapered 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 extending piece 613. The first concave groove 613c extends along the axis Ox and extends from the wire insertion hole 612a of the cylindrical portion 612. In the present embodiment, the first concave groove 613c is formed in the extending piece 613 over the entire length in the longitudinal direction (the direction in which the axis Ox extends). In the present embodiment, the cross-sectional shape of the first concave groove 613 c is a semicircular shape near the proximal end of the extending piece 613 and a triangular shape near the distal end of the extending piece 613.

  As shown in FIGS. 3 and 6, a pair of first recesses 613 d and 613 d are formed at the proximal end portion of the extending piece 613 with the axis Ox interposed therebetween. Each first recess 613d is recessed from the inner portion 613a and has a substantially semi-cylindrical shape.

  A pair of second recesses 613e and 613e are formed at the tip of the extension piece 613 with the axis Ox interposed therebetween. Each second recess 613e is recessed from the inner portion 613a. In the present embodiment, each second recess 613e is long in the direction in which the axis Ox extends.

  In the present embodiment, a mounting groove 613f is formed in the outer peripheral portion 613b of the extending piece 613. The mounting groove 613f is a groove for mounting the separation preventing member 63, and is formed along the circumferential direction in the outer peripheral portion 613b.

  The pressure chip 62 is disposed to face the extended piece 613 of the base chip 61. The pressure tip 62 can be separated from the base tip 61 as shown in FIG. The pressure tip 62 has a substantially semicircular cross section, and has an inner part 62a facing the extension piece 613 and an outer peripheral part 62b facing the opposite side of the extension piece 613 with respect to the inner part 62a. . The inner part 62a is planar, and the outer peripheral part 62b is tapered and tapered so as to approach the axis Ox toward the tip.

  A second concave groove 62 c is formed in the inner portion 62 a of the pressure tip 62. The second concave groove 62 c extends in the longitudinal direction of the pressure tip 62. In the present embodiment, the second concave groove 62 c is formed over the entire length of the pressure tip 62 in the longitudinal direction. In the present embodiment, the cross-sectional shape of the second concave groove 62c is a triangular shape.

  As shown in FIGS. 3 and 6, a pair of first protrusions 62 d and 62 d are formed on the proximal end portion of the pressure tip 62 with the axis Ox interposed therebetween. Each first protrusion 62d protrudes from the inner portion 62a and has a substantially semicylindrical shape. As clearly shown in FIG. 6, the pair of first protrusions 62 d and 62 d are fitted into the pair of first recesses 613 d and 613 d in the extending piece 613.

  A pair of second protrusions 62e and 62e are formed at the tip of the pressure tip 62 with the axis Ox interposed therebetween. Each second protrusion 62e protrudes from the inner part 62a. The pair of second protrusions 62e and 62e are fitted into the pair of first recesses 613d and 613d in the extending piece 613. In the present embodiment, each second protrusion 62e has a long shape.

  In the present embodiment, a mounting groove 62 f is formed on the outer peripheral portion 62 b of the pressure tip 62. The mounting groove 62f is a groove for mounting the separation preventing member 63, and is formed along the circumferential direction in the outer peripheral portion 62b.

  The base chip 61 and the pressure chip 62 are made of a conductive metal.

  The separation preventing member 63 prevents the pressure tip 62 from being separated from the extending piece 613. In the present embodiment, the separation preventing member 63 is a substantially annular metal elastic ring. The separation preventing member 63 is notched at one place in the circumferential direction, and is pushed out by being fitted into the outer peripheral portions 613b and 62b from the distal end side to the proximal end of the extending piece 613 and the pressure tip 62. While being expanded in diameter, it is mounted in mounting grooves 613f and 62f formed in the outer peripheral portions 613b and 62b. When the separation preventing member 63 is mounted, an urging force is applied in a direction in which the extending piece 613 and the pressing tip 62 approach each other.

  As understood with reference to FIGS. 5 to 7, the welding wire 9 fed to the welding torch A <b> 1 passes through the wire insertion hole 612 a, and then the first concave groove 613 c of the extending piece 613 and the pressure tip. 62 passes between the second concave grooves 62c. At this time, the welding wire 9 is sandwiched in a state of being pressed by the extending piece 613 and the pressure tip 62 (first concave groove 613c and second concave groove 62c). Thereby, a predetermined sliding resistance acts on the welding wire 9.

  In the present embodiment, the pair of first recesses 613d and 613d and the pair of first protrusions 62d and 62d fitted to the first recesses 613d and 613d have a substantially semi-cylindrical shape. Thereby, if there is no restriction | limiting by the separation prevention member 63, the pressurization chip | tip 62 can be rotated around the rotating shaft Oy (perpendicular to the axis line Ox) which connects a pair of 1st protrusion 62d, 62d (FIG. 4, FIG. (See FIG. 6).

  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 feed chip 6. The nozzle 5 has a base end portion connected to the insulating bush 3 by screw means 51.

  For example, a wire guide liner (not shown) is accommodated inside the torch body 1 and the chip body 2. A welding wire (not shown) passes through the wire guide liner and is fed to the welding torch A1. The fed welding wire passes through 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 62c. The lead tip 6 (the extended piece 613 and the pressure tip 62) is led out from the tip.

  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 periphery of the orifice member 4 to form an annular space 42 between the outer surface of the chip body 2, and the annular space 42 and the inner space of the nozzle 5 are separated by an orifice hole 43. Communicate. In addition, a vent hole 23 is formed in the chip body 2 to allow the center hole 21 and the annular space 42 to communicate with each other. As a result, the shield gas sent to the welding torch A1 is introduced into the center hole 21 of the tip body 2, and enters the inner space of the nozzle 5 from the vent hole 23, the annular space 42 of the orifice member 4, or the orifice hole 43. It is sent and finally ejected from the tip of the nozzle 5.

  Next, the operation of this embodiment will be described.

  In the present embodiment, the power feeding chip 6 includes a base chip 61, a pressure chip 62, and a separation preventing member 63. The base tip 61 has a cylindrical portion 612 in which a wire insertion hole 612a is formed, and an extending piece 613 extending from the tip of the cylindrical portion 612. The pressure tip 62 has an axis Ox of the wire insertion hole 612a. The extending piece 613 is disposed so as to be sandwiched therebetween. The pressure chip 62 can be separated from the base chip 61, and the separation preventing member 63 is mounted across the outer peripheral part 613b of the extending piece 613 and the outer peripheral part 62b of the pressure chip 62. When the power feeding tip 6 is assembled to the welding torch A1 and used, the welding wire fed to the welding torch A1 passes through the wire insertion hole 612a in the power feeding tip 6 and then the extension piece 613 and the pressure tip 62. Pass between. Here, the welding wire 9 is sandwiched between the extension piece 613 and the pressure tip, and a pressure is applied to the welding wire 9. Therefore, according to the power supply tip 6 of the present embodiment, it is possible to apply pressure to the welding wire without using a dedicated component such as a conventional pressure shaft or tip holder. As a result, the power feed tip 6 can be incorporated into the standard welding torch A1, and the forced pressure power feeding type welding torch A1 can be easily provided at low cost.

  Further, the pressure chip 62 is separable from the base chip 61 and is disposed to face the extended piece 613. According to such a configuration, it is possible to ensure an appropriate gap between the extending piece 613 and the pressure tip 62 (the inner portions 613a and 62a) facing each other. Therefore, even if dust such as spatter generated during welding enters the inside of the power supply tip 6, dust is expelled from the gap between the extension piece 613 and the pressure tip 62. Thereby, the lifetime of the electric power feeding chip | tip 6 is achieved.

  The extension piece 613 is formed with a first concave groove 613c extending along the axis Ox, and a portion of the pressure chip 62 that faces the extension piece 613 is a second part that opposes the first concave groove 613c. A concave groove 62c is formed. According to such a configuration, the welding wire that has passed through the wire insertion hole 612 a of the cylindrical portion 612 is sent out while being guided toward the tip of the power feed tip 6. This contributes to improvement in welding quality.

  A pair of first recesses 613d and 613d are formed at the base end portion of the extending piece 613 with the axis Ox interposed therebetween, and the pair of first recesses 613d and 613d are formed at the base end portion of the pressure tip 62. A pair of first protrusions 62d, 62d to be fitted is formed. According to such a configuration, it is possible to position the pressure tip 62 that is disposed to face the extended piece 613. Further, when the separation preventing member 63 is mounted, a predetermined amount is applied to the pressure chip 62 at the mounting position of the separation preventing member 63 with the fitting portion between the pair of first recesses 613d and 613d and the pair of first protrusions 62d and 62d as a fulcrum. A pressing force can be applied.

  In the present embodiment, a pair of second recesses 613e and 613e are formed at the tip of the extension piece 613 with the axis Ox interposed therebetween, and a pair of second recesses are formed at the tip of the pressure tip 62. A pair of second protrusions 62e and 62e are formed to fit with 613e and 613e. According to such a configuration, the pressure chip 62 can be positioned with higher accuracy.

  In the present embodiment, the pair of second recesses 613e and 613e and the pair of second protrusions 62e and 62e provided at the tip of the extension piece 613 and the pressure tip 62 are long in the direction in which the axis Ox extends. is there. According to such a configuration, it is possible to efficiently suppress the lateral vibration of the tip portion of the pressure tip 62. This contributes to improvement in 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 all modifications within the scope of the matters described in the claims are all within the scope of the present invention. Is included.

  In the embodiment described above, the mounting grooves 613 f and 62 f for mounting the separation preventing member 63 are formed near the base ends of the extending piece 613 and the pressure tip 62. By changing the positions where the mounting grooves 613f and 62f are formed, the distance from the fitting portion between the pair of first recesses 613d and 613d and the pair of first protrusions 62d and 62d is changed, and welding in the power feed tip 6 is performed. The pressure applied to the wire can be adjusted. Further, the pressure applied to the welding wire can be easily adjusted by changing the elastic strength of the separation preventing member 63.

  In the said embodiment, although the separation prevention member 63 was comprised by the metal ring members which have a notch in one place, it is not limited to this. For example, the separation preventing member may be composed of an endless annular heat-resistant elastic body.

A1 Welding torch 1 Torch body 2 Tip body 21 Center hole 22 Screw means 23 Ventilation hole 3 Insulating bush 31 Screw means 4 Orifice member 41 Annular groove 42 Annular space 43 Orifice hole 5 Nozzle 51 Screw means 6 Power feed tip 61 Base tip 611 Connection portion 611a Center hole 612 Tubular part 612a Wire insertion hole 613 Extension piece 613a Inner part 613b Outer part 613c First recessed groove 613d First recessed part 613e Second recessed part 613f Mounting groove 62 Pressure tip 62a Inner part 62b Outer part 62c First 2 groove 62d first protrusion 62e second protrusion 62f mounting groove 63 separation preventing member 9 welding wire Ox axis Oy rotation axis

Claims (7)

A base chip having a cylindrical portion in which a wire insertion hole is formed along the axis, and an extending piece extending in a direction in which the axis extends from the tip of the cylindrical portion;
A pressure tip that is disposed opposite the extension piece across the axis and separable from the base tip;
A power supply chip comprising: a separation preventing member that is mounted across the outer periphery of the extension piece and the outer periphery of the pressure chip and prevents the pressure chip from being separated from the extension piece.   One of the base end of the extension piece and the base end of the pressure tip has a pair of first recesses with the axis interposed therebetween, and the other fits into the pair of first recesses. The power supply chip according to claim 1, wherein a pair of first protrusions to be joined is formed.   A pair of second recesses are formed on one of the tip of the extension piece and the tip of the pressure tip with the axis interposed therebetween, and the other fits with the pair of second recesses. The power supply chip according to claim 2, wherein a pair of second protrusions are formed.   The power supply chip according to claim 3, wherein the pair of second recesses and the pair of second protrusions are long in a direction in which the axis extends. A first concave groove extending along the axis is formed in a portion of the extending piece that faces the pressure chip,
5. The power feeding chip according to claim 1, wherein a second concave groove facing the first concave groove is formed in a portion of the pressure chip facing the extending piece. 6.   The separation preventing member is an annular or substantially annular elastic ring, and applies an urging force in a direction in which the extension piece and the pressure tip approach each other when attached to the extension piece and the pressure tip. The power supply chip according to claim 1. A welding torch comprising a cylindrical torch body, a cylindrical tip body attached to the tip of the torch body, and a power feed tip attached to the tip of the tip body,
The power supply chip has a cylindrical portion in which a wire insertion hole is formed along an axis, and an extending piece extending in a direction in which the axis extends from a distal end of the cylindrical portion, and a base end is attached to the chip body. A base chip,
A pressure tip disposed opposite the extension piece across the axis;
A welding torch comprising: an anti-separation member that is mounted across the outer periphery of the extension piece and the outer periphery of the pressure tip and prevents the pressure tip from separating from the extension piece.

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