| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic welding apparatus not causing twists to occur in a power cable and a gas hose connected to a welding torch even when the welding torch performs welding operation while revolving and being capable of continuously performing the welding operation.SOLUTION: A conductive plate 3, a gas groove 4 and a cooling medium groove 5 are annularly formed on an annular-shaped fixed rail 2 and are individually connected with a first power cable 15a, a first gas hose 16a and a first cooling medium hose 17a. Annular seal members 25 individually inserted into an electric contactor 7 brought into slide contact with the conductive plate 3, the gas groove 4 and the cooling medium groove 5 and sealing between a drive rail 6 and the fixed rail 2 are provided to the drive rail 6 revolving in a circumferential direction on the fixed rail 2. End portion openings of a second gas hose 16b and a second cooling medium hose 17b are individually opened at gas groove 4 and cooling medium groove 5 sides. On this account, a second power cable 15b joined to the electric contactor 7, the second gas hose 16b and the second cooling medium hose 17b are free of twists even when a welding torch 11 provided on the drive rail 6 performs welding operation while revolving.SELECTED DRAWING: Figure 2 |
