JP2011073023A - Conduit cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conduit cable that prevents an insulation jacket from being pulled and drawn by tensile force worked on the conduit cable. <P>SOLUTION: The end of a conduit cable 21 is inserted in a case holder 13, and a conductor 11 caulked around a metal fitting 14 for supplying electric power and fixed. A projected part 22 is provided to the inner periphery on the inserting port side of the conduit cable 21 inside the case holder 13, and a split clamp 23 is provided between the metal fitting 14 for supplying the electric power and the projected part 22 and fixed to the outer periphery of the insulation jacket 12, and a tapered part 24 is formed on the outer periphery of the split clamp 23. The tapered part 24 of the split clamp 23 and the projected part 22 are shaped so that, when the insulation jacket 12 is moved by tensile force in a direction pulled out from the case holder 13, the split clamp 23 is moved, and the tapered part 24 of the split clamp 23 is caught on the projected part 22 and stopped. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a conduit cable for connecting a welding torch and a wire feeder in semi-automatic arc welding in which a welding operator performs welding by manually operating a welding torch.

  FIG. 6 is a diagram showing a configuration of the semi-automatic arc welding apparatus. In the figure, a welding wire wound around a wire reel 1 is fed from a wire feeder 2, guided by a conduit cable 8, and fed to a welding torch 3. Shield gas is supplied from the gas cylinder 4 to the welding torch 3 via the wire feeder 2, and electric power is supplied from the welding power source 5 to the welding torch 3 and the workpiece 6 via the wire feeder 2. The The remote control box 7 sets the welding current and the welding voltage.

  Conventionally, the conduit cable 8 for supplying electric power to the welding torch 3 has been proposed as shown in FIG. (For example, refer to Patent Document 1). FIG. 7 is a cross-sectional view of a prior art conduit cable used for a welding torch. FIG. 7A is a cross-sectional view in the long axis direction, and FIG. 7B is a cross-sectional view in the direction perpendicular to the long axis. It is sectional drawing.

  In FIG. 7, a coil liner 9 in a conduit cable 8 is formed by forming a metal wire into a coil shape so that a welding wire is passed through the inside. The coil liner 9 is inserted through the center tube 10, and the shield gas flows through a donut-shaped space between the outer wall of the coil liner 9 and the inner wall of the center tube 10. In addition, a conductor 11 formed of a large number of copper strands is provided around the central tube 10, and electric power is supplied to the conductor 11. This conductor 11 is covered and protected by an insulating jacket 12 made of resin.

  FIG. 8 is a cross-sectional view showing the structure inside the case holder on the wire feeder side where one end of the conduit cable is inserted. In the figure, the direction in which the conduit cable 8 is inserted into the case holder 13 is X2, and the direction in which the conduit cable 8 is pulled out from the case holder 13 is X1. The end portion of the conduit cable 8 is in a state where the conductor 11 is exposed from the insulating sheath 12 in order to fix the conductor 11 to the power supply fitting 14. A reinforcement pipe 15 made of a deformation-preventing metal is inserted in the X1 direction inside the end of the central tube 10 to supply power around the base end (X2 direction) of the reinforcement pipe 15. The front end portion (X1 direction) of the power supply metal fitting 14 is covered. The end portion of the conductor 11 in an exposed state is covered so as to be in close contact with the periphery of the front end portion of the power supply metal fitting 14.

  A cylindrical caulking member 16 formed of a copper alloy is applied to the periphery of the end portion of the conductor 11, and the end portion of the conductor 11 is caulked around the end portion of the power supply metal fitting 14. Is fixed. Further, the end portion of the insulating skin 12 is also caulked by a caulking member 16 and fixed around the conductor 11. At this time, since the insulating skin 12 is made of resin, if the insulating skin 12 and the conductor 11 are integrally stacked and caulked around the power supply metal fitting 14, the insulating skin 12 is damaged. The insulating outer skin 12 and the conductor 11 cannot be overlapped together and caulked around the power supply metal fitting 14 for fixing. Therefore, usually, the conductor 11 is exposed from the insulating sheath 12 at the end of the conduit cable 8, and only the conductor 11 is firmly caulked around the power supply fitting 14 to fix the end of the insulating sheath 12. The caulking member 16 is fixed around the conductor 11 by caulking with a light pressure that does not damage the insulating skin 12.

Japanese Patent Application Laid-Open No. 2007-167872.

  When the operator pulls the welding torch 3 or moves the wire feeder 2 during the welding operation, the conduit cable 8 is often pulled or twisted. A load is applied to the location where is connected. In this case, since the insulating skin 12 is not firmly fixed to the conductor 11 as described above, only the insulating skin 12 is pulled in the X1 direction and pulled out from the caulking portion with the caulking member 16. In this case, since the conductor 11 is firmly caulked and fixed around the power supply metal fitting 14, there is a problem that the conductor 11 is further exposed.

  In the present invention, when the conduit cable 8 is pulled from the case holder 13, the insulating outer skin 12 is pulled and pulled out from the caulked portion with the caulking member 16, and the conductor 11 is further exposed. The object is to provide a conduit cable 8 to prevent.

The first invention is
A conduit cable having a conductor for supplying electric power and an insulating sheath for protecting the conductor and inserting a welding wire;
A case holder into which one end of the conduit cable for connecting to either the wire feeder or the welding torch is inserted;
The conductor at the end of the conduit cable inserted into the case holder is exposed from the insulating sheath, and the exposed conductor is caulked around and fixed in the case holder. In a conduit cable with a power supply bracket provided,
A protrusion provided on the inner periphery of the conduit cable on the insertion port side in the case holder;
An insertion hole through which the insulating outer skin is inserted is formed in the shaft core portion, a vertical slit is formed from the tip portion, and is fixed to the outer periphery of the insulating outer shell, and a tapered portion is formed on the outer periphery. Comprising a conductor caulking portion in which a conductor is caulked around the metal fitting and a split clamp provided between the protrusions;
When a pulling force or a twisting force is applied to the conduit cable, and the insulating sheath moves in the direction of being pulled out from the case holder, the split clamp moves in the direction of the protrusion, and the taper of the split clamp The conduit cable is characterized in that the shape of the tapered portion and the protruding portion of the split clamp is formed so that the portion is caught by the protruding portion and stopped.

The second invention is
A pressure spring provided between the conductor caulking portion and the split clamp in the case holder and having the insulating sheath inserted;
One end of the pressurizing spring on the conductor caulking portion side is fixed to the outer periphery of the insulating sheath, and the other end of the pressurizing spring abuts on the base end portion of the split clamp so that the split clamp is on the protrusion side. The conduit cable according to the first aspect of the present invention, wherein the conduit cable is pressurized.

  Even if the conduit cable is pulled from the case holder and a pulling force or a twisting force is applied to the conduit cable, the insulating sheath is pulled and pulled out from the caulking portion with the caulking member. Is further suppressed from being exposed.

It is a fragmentary sectional view of the conduit cable of Embodiment 1 of the present invention. It is a figure which shows the split clamp used for the conduit cable of this invention. It is a fragmentary sectional view of the conduit cable of Embodiment 2 of the present invention. It is a fragmentary sectional view when the edge part of the conduit cable of this invention is connected to the welding torch. It is a fragmentary sectional view when the edge part of the conduit cable of this invention is connected to the welding torch. It is a figure which shows the structure of a semi-automatic arc welding apparatus. It is sectional drawing of the prior art conduit cable used for a welding torch. It is sectional drawing which shows the structure in the case holder by the side of the wire feeder in which the end of the conduit cable was inserted.

[Embodiment 1]
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 partial cross-sectional view of a conduit cable according to Embodiment 1 of the present invention. In the figure, the structure of the coil liner 9, the central tube 10, the conductor 11, and the insulation jacket 12 of the conduit cable 21 is the same as that of the conduit cable 8 shown in FIG. The end of the conduit cable 21 is inserted into the case holder 13, and the conductor 11 at the end of the conduit cable 21 is covered with the power supply fitting 14 in the case holder 13 so as to be in close contact with the caulking. Being fixed. Hereinafter, this caulked portion is referred to as a conductor caulking portion. The method for fixing the conductor 11 and the insulating sheath 12 at the end of the conduit cable 21 is the same as the method for fixing the conduit cable 8 shown in FIG. In the case holder 13, two protrusions 22 are provided on the inner periphery of the conduit cable 21 on the insertion port side. The protrusions 22 and 22 are also used as screwing portions of the case holder 13.

  A split clamp 23 is provided between the conductor caulking portion and the protrusions 22, 22, and the conduit cable 21 is inserted into the split clamp 23, and the split clamp 23 is fixed to the outer periphery of the insulating outer skin 12. ing. A taper portion 24 is formed on the outer periphery of the split clamp 23 so as to taper in the insertion port direction (X1 direction) of the conduit cable 21. In order to fix the split clamp 23, the split clamp 23 is adhered to the insulating skin 12, or, for example, the hose band 25 is wound around the insulating skin 12 on the X1 direction side of the power supply fitting 14 and fixed. The split clamp 23 may be fixed by abutting the split clamp 23 on the surface of the hose band 25 in the X1 direction.

  The split clamp 23 has a shape shown in FIG. 2, and an insertion hole 27 through which the insulating outer skin 12 is inserted is formed in the shaft core part, and a vertical slit 28 is formed from the tip part. FIG. 4A shows a split clamp formed with one vertical slit, FIG. 4B shows a split clamp formed with two vertical slits, and FIG. 4C shows four vertical slits. The formed split clamp is shown. Also, three vertical slits may be formed. The periphery of the insulating skin 12 can be fixed evenly by forming a plurality of vertical slits rather than forming one.

  The shape of the taper portion 24 and the projections 22 and 22 of the split clamp 23 is such that when the insulating sheath 12 moves in the direction (X1 direction) pulled out from the case holder 13 due to the pulling force or twisting force acting on the conduit cable 21. Furthermore, the split clamp 23 moves in the direction of the projections 22 and 22 (X1 direction), and the taper portion 24 of the split clamp 23 is fitted between the two upper and lower projections 22 and 22, so that the split clamp 23 The distal end portion (in the X1 direction) is reduced in diameter and is caught by the protrusions 22 and 22 to stop, thereby holding the insulating outer skin 12. When a twisting force is applied to the conduit cable 21, the conductor 11 returns and the insulating sheath 12 extends.

  A protective spring 26 made of metal for protecting the insulating skin 12 is provided around the insulating skin 12, and the protective spring 26 protects the insulating skin 12 outside the case holder 13, and the case holder 13 also protects the insulating outer skin 12. Since the protective spring 26 is provided only for protecting the insulating skin 12, it may not be provided. By forming the split clamp 23 with resin, it is possible to prevent the split clamp 23 from being electrically connected to the metal portion.

  The operation will be described below. The end portion of the conduit cable 21 is inserted into the case holder 13, and the conductor 11 exposed at the end portion of the conduit cable 21 is covered with the periphery of the power supply fitting 14 in the case holder 13. It is fixed by being caulked. A split clamp 23 is provided between the conductor caulking portion and the protrusions 22, 22, and the conduit cable 21 is inserted into the split clamp 23, and the split clamp 23 is fixed to the outer periphery of the insulating outer skin 12. ing.

  The operator pulls the welding torch 3 or moves the wire feeder 2, and the pulling force or twisting force in the X1 direction acts on the conduit cable 21, and the insulating sheath 12 is pulled out from the case holder 13. When moved in the (X1 direction), the split clamp 23 fixed to the insulating skin 12 moves in the direction of the projections 22 and 22 formed in the case holder 13 (X1 direction), and the taper of the split clamp 23 The tip 24 (X1 direction) of the split clamp 23 is reduced in diameter so that the portion 24 fits into the protrusions 22 and 22 and stops and holds the insulating outer skin 12.

  As a result, the conduit cable according to the first embodiment of the present invention is pulled from the caulking portion with the caulking member 16 by the insulation sheath 12 being pulled even if the conduit cable 21 is subjected to a pulling force or twisting force in the X1 direction. It is suppressed that the conductor 11 is further exposed and is exposed.

[Embodiment 2]
FIG. 3 is a partial cross-sectional view of the conduit cable 31 according to the second embodiment of the present invention. In the figure, a pressure spring 32 is provided in the case holder 13 between the conductor caulking portion and the split clamp 23, and the insulating skin 12 is inserted into the pressure spring 32. One end (X2 direction) of the pressure spring 32 is fixed to the outer periphery of the insulating skin 12, and the other end (X1 direction) of the pressure spring 32 is in contact with the proximal end portion (X2 direction) of the split clamp 23. 23 is pressed to the protrusions 22 and 22 side (X1 direction). For other functions, the same reference numerals are given to the same functions of the conduit cable 21 according to the first embodiment of the present invention shown in FIG.

  The operation will be described below. In the operation of the conduit cable 31 according to the first embodiment of the present invention, in addition to the above-described operation of the conduit cable 21 according to the first embodiment of the present invention, the other end (X1 direction) of the pressure spring 32 is the split clamp 23. The split clamp 23 is always pressed against the projections 22 and 22 side (X1 direction) in contact with the base end portion (X2 direction).

  As a result, the conduit cable 31 according to the second embodiment of the present invention is pulled out of the caulking portion with the caulking member 16 by the insulation sheath 12 being pulled, similarly to the conduit cable 21 according to the first embodiment of the present invention. Further, since the conductor 11 is further prevented from being exposed, and there is no tolerance in the movement of the split clamp 23, the pulling force or twisting force in the X1 direction acts on the conduit cable 31, and the insulating sheath 12 is When moving in the direction of pulling out from the case holder 13 (X1 direction), the split clamp 23 fixed to the insulating outer skin 12 moves in the direction of the protrusions 22 and 22 formed in the case holder 13 and immediately The tip of the split clamp 23 is reduced in diameter so that the tapered portion 24 of the split clamp 23 fits into the protrusions 22 and 22. Stop hanging Tsu, it can hold the insulating outer cover 12.

  Although the above-described conduit cable according to the first and second embodiments of the present invention has been described with respect to the case where the end portion of the conduit cable is connected to the case holder 13 for connecting to the wire feeder 2, 4 and 5 show a case where the end portion is connected to the case holder 33 for connecting to the welding torch 3. 4 and 5 are partial cross-sectional views when the end of the conduit cable of the present invention is connected to a welding torch. FIG. 4 is a drawing corresponding to the partial cross-sectional view of the conduit cable 21 according to the first embodiment of the present invention shown in FIG. 1, and the configuration, operation and effect thereof are the same as those of the conduit cable 21 according to the first embodiment of the present invention. Since it is the same, explanation is omitted. FIG. 5 is a drawing corresponding to the partial cross-sectional view of the conduit cable 31 according to the second embodiment of the present invention shown in FIG. 3, and the configuration, operation, and effect are the conduit cable according to the second embodiment of the present invention. The description is omitted because it is the same as 21.

DESCRIPTION OF SYMBOLS 1 Wire reel 2 Wire feeder 3 Welding torch 4 Gas cylinder 5 Welding power supply 6 Welded object 7 Remote control box 8 Conduit cable 9 Coil liner 10 Center pipe 11 Conductor 12 Insulation jacket 13 Case holder 14 Power supply metal fitting 15 Reinforcement Pipe 16 Caulking member 21 Conduit cable 22 Projection portion 23 Split clamp 24 Tapered portion 25 Hose band 26 Protection spring 27 Insertion hole 28 Vertical slit 31 Conduit cable 32 Pressure spring 33 Case holder

Claims (2)

A conduit cable having a conductor for supplying electric power and an insulating sheath for protecting the conductor and inserting a welding wire;
A case holder into which one end of the conduit cable for connecting to either the wire feeder or the welding torch is inserted;
The conductor at the end of the conduit cable inserted into the case holder is exposed from the insulating sheath, and the exposed conductor is caulked around and fixed in the case holder. In a conduit cable with a power supply bracket provided,
A protrusion provided on the inner periphery of the conduit cable on the insertion port side in the case holder;
An insertion hole through which the insulating outer skin is inserted is formed in the shaft core portion, a vertical slit is formed from the distal end portion, the outer peripheral surface of the insulating outer skin is fixed, and a tapered portion is formed on the outer periphery. Comprising a conductor caulking portion in which a conductor is caulked around the metal fitting and a split clamp provided between the projections;
When a pulling force or a twisting force is applied to the conduit cable, and the insulating sheath moves in the direction of being pulled out from the case holder, the split clamp moves in the direction of the protrusion, and the taper of the split clamp The conduit cable is characterized in that the shape of the tapered portion and the protruding portion of the split clamp is formed so that the portion is caught by the protruding portion and stopped. A pressure spring provided between the conductor caulking portion and the split clamp in the case holder and having the insulating sheath inserted;
One end of the pressurizing spring on the conductor caulking portion side is fixed to the outer periphery of the insulating sheath, and the other end of the pressurizing spring abuts on the base end portion of the split clamp so that the split clamp is on the protrusion side. The conduit cable according to claim 1, wherein the conduit cable is pressurized.

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