JPH0120070Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a welding torch cable connector for connecting a conduit cable having a welding torch body attached to the tip to a welding machine body.

[Prior Art] As shown in FIG. 6, a conventional connector of this type includes a cylindrical connecting fitting 2 that electrically connects a power supply conductor 1 to a welding machine main body (not shown). A spring liner 3 is disposed within the hole 2a of the connecting fitting 2. Hole 2a of connection fitting 2
A cap 4 is attached to the tip of the cap 4 , and an O-ring 5 maintains airtightness between the cap 4 and the connecting fitting 2 . The tip of a spring liner 3 is fixed to the base 4, and the welding wire 6 is guided by the spring liner 3. A shielding gas passage 7 is formed between the hole 2a of the connection fitting 2 and the spring liner 3, and a seal coating layer 8 made of heat-shrinkable resin is coated on the outside of the spring liner 3 to keep the shielding gas passage 7 airtight. Retained. Therefore, leakage of the shielding gas through the outer periphery of the spring liner 3 is prevented. However, the seal coating layer 8 is formed over the entire length of the spring liner 3.
It was impractical to cover it due to the high cost. Further, in the spring liner 3 near the tip of the welding torch body, there is a risk that the seal coating layer 8 may be damaged due to heat or the like, which is impractical.

Therefore, conventionally, the seal coating layer 8 was applied only to the vicinity of the base 4 of the spring liner 3.

[Problems to be Solved by the Invention] In the connector having the seal coating layer 8 only near the end portions as described above, the shielding gas flows from the portion of the spring liner 3 not covered with the seal coating layer 8 to the spring. There was a problem in that the welding wire leaked through the axial core of the liner 3 to the outside from the gap between the welding wire through hole 4a of the base 4 and the welding wire 6. In this case, the gap between the welding wire through hole 4a of the base 4 and the welding wire 4 is approximately
Even with a thickness of 0.2 mm, the amount of shielding gas leaking to the outside reached approximately 5% of the supplied amount, which was uneconomical.

An object of the present invention is to provide a welding torch cable connector that can suppress leakage of shielding gas from the connector end.

[Means for Solving the Problems] The present invention will be explained with reference to the embodiments shown in FIGS. A metal fitting 2, a spring liner 3 disposed in the hole of the connecting metal fitting 2 to guide the welding wire 6, and a welding wire through hole 4a formed in the shaft center of the spring liner 3 that is airtightly attached to the tip of the connecting metal fitting 2. A connector for a welding torch cable, which is equipped with a welding torch cable base 4 and a shielding gas passage 7 provided outside the spring liner 3 in the connecting fitting 2. A sealing material 1 that airtightly seals the welding wire through hole 4a by passing through the welding wire through hole 4a airtightly.
2 is provided.

[Function] As described above, when the sealing material 12 that airtightly seals the welding wire through hole 4a by allowing the welding wire 6 to pass through the mouthpiece 4 airtightly, the welding wire through hole 4a of the mouthpiece 4 and the welding Leakage of the shielding gas from the gap between the wire 6 and the wire 6 can be suppressed.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 3 are views showing a first embodiment of the present invention, and the connector in these figures has a cylindrical connecting fitting 2 made of a conductive material. The end of the power supply conductor 1 is electrically and mechanically connected to the connection fitting 2 by a joint 10. The joint 10 is configured such that the end of the connecting fitting 2 and the end of the power supply conductor 1 are sandwiched and caulked by an inner cylinder member 10a and an outer cylinder member 10b. Further, a flexible central tube 1a is disposed inside the power supply conductor 1, and an insulating coating layer 1b is disposed outside the power supply conductor 1. The connecting fitting 2 has a spring liner insertion hole 2a at its axial center and a base insertion hole 2b at its tip.
is formed. A cap 4 is inserted into the cap insertion hole 2b, and the cap 4 is connected to the connecting fitting 2 by a screw 11.
is fixed to. Base insertion hole 2b of connection fitting 2
A sealing material 5 made of an O-ring is disposed between the step portion 2c at the boundary between the spring liner insertion hole 2a, which has a smaller diameter than the cap insertion hole 2b, and the cap 4. Airtightness between the cap and the base 4 is maintained. A welding wire through hole 4a having a tapered tip is formed in the axial center of the cap 4, and a spring liner mounting hole 4b is formed in communication with the welding wire through hole 4a. A bottom portion 4c perpendicular to the axis of the base 4 is formed on the side of the welding wire through hole 4a of the spring liner mounting hole 4b,
A plate-shaped sealing material 12 such as a rubber gasket is disposed within the spring liner mounting hole 4b so as to abut against the bottom portion 4c. The tip of the spring liner 3 is tightly fitted into the spring liner attachment hole 4b so as to press the sealing material 12 against the bottom 4c, and the spring liner 3 and the base 4 are integrated. The spring liner 3 is inserted into the spring liner insertion hole 2a of the connection fitting 2, and the space between the spring liner insertion hole 2a and the spring liner 3 is configured as a shielding gas passage 7. The welding wire 6 passing through the welding wire through hole 4a of the base 4 is inserted into the spring liner 3 by passing through the sealing hole 12a of the sealing material 12 in an airtight manner. An insertion portion 2d that is inserted into a cable attachment portion of a welding machine main body (not shown) is formed at the tip of the connection fitting 2.
A recess 2e is formed in a part of the outer periphery of d to engage with an engaging portion of a cable attachment portion (not shown).
An insulating cover 13 is disposed on the outside of the connecting fitting 2, and the insulating cover 13 is designed to prevent the connecting fitting 2 from rotating by a rotation preventing portion 13a.
A shielding gas supply pipe 14 and a control cable 15 pass through the insulating cover 13, the shielding gas supply pipe 14 is connected to the shielding gas passage 7, and the control cable 15 is disposed outside the power supply conductor 1. There is.

Therefore, in the above embodiment, the shielding gas supplied to the shielding gas passage 7 also enters the axial portion of the spring liner 3; Therefore, it is blocked and the leakage to the outside from the gap between the welding wire through hole 4a of the base 4 and the welding wire 6 is suppressed as in the conventional case. Also,
The sealing material 5 can maintain airtightness between the cap 4 and the connecting fitting 2, and the shielding gas can be supplied to the welded part without being wastefully discharged to the outside.

FIG. 4 is a diagram showing a second embodiment of the present invention, and the connector shown in this figure has a sealing material 12 on the base 4 for maintaining airtightness between the welding wire through hole 4a and the welding wire 6. It is formed into a cap shape that covers 4 from the outside.

FIG. 5 is a diagram showing a third embodiment of the present invention, in which a sealing material 12 is interposed between the bottom 4c of the spring liner mounting hole 4b of the base 4 and the end 3a of the spring liner 3. This maintains airtightness between the welding wire through hole 4a of the base 4 and the welding wire 6, and sealing material 5 made of an O-ring
is accommodated in a recess 4d formed on the outer periphery of the cap 4, so that airtightness between the cap 4 and the connecting fitting 2 is maintained. Further, the vicinity of the end portion 6a of the spring liner 6 is coated with a seal coating layer 8 made of a heat-shrinkable resin.

In each of the above embodiments, the seal hole 12a of the sealing material 12 that maintains airtightness between the welding wire through hole 4a of the cap 4 and the welding wire 6 has a diameter slightly smaller than that of the welding wire 6. It may be formed with a hole in it, or it may be formed in such a way that a thin guide hole is made in advance with a needle or the like so that it is opened by the welding wire 6 when the welding wire 4 is fed.

[Effects of the invention] As described above, according to the invention, since a sealing material is provided that airtightly seals the welding wire through hole by allowing the welding wire to pass through the mouthpiece, the welding wire does not penetrate through the mouthpiece. There is an advantage that leakage of shielding gas from the gap between the hole and the welding wire can be suppressed.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the first embodiment of the present invention, and the second
The figure is an enlarged sectional view of the main parts of Fig. 1, Figs. 3a and 3b are longitudinal sectional views and front views of the main parts of the first embodiment of the present invention, respectively, and Figs. 4 and 5 are the main parts of the present invention. FIG. 6 is a longitudinal sectional view of a conventional connector. 1... Power supply conductor, 2... Connection fittings, 3... Spring liner, 4... Base, 5... Sealing material,
6... Welding wire, 7... Shield gas passage, 1
2...Sealing material.

Claims (1)

[Claims for Utility Model Registration] A cylindrical connecting fitting for electrically connecting a power supply conductor to a welding machine main body, a spring liner disposed in a hole of the connecting fitting for guiding a welding wire, A welding torch comprising: a cap airtightly attached to the tip of the connecting fitting and having a welding wire through hole formed in the shaft core; and a shielding gas passage provided outside the spring liner within the connecting fitting. A connector for a cable for a welding torch, characterized in that the base is provided with a sealing material that allows a welding wire to pass through the welding wire penetration hole and hermetically seals the welding wire through hole. .