| 摘要 |
A machine for electrical resistance welding of chain links has upsetting bars (10) which are engaged against the arcuate ends of a chain link (1). On either side of the welding zone the legs of a link are gripped by pairs of electrodes (12) attached to the ends of a two-armed clamp (14). The arms (13) of the clamp are mounted for pivoting in a plane at right angles to the chain link, and also about an axis in this plane extending at right angles to the upsetting direction and passing through journalling head (20) attached to the end of a piston rod (21) of a counteraction cylinder (20). The ends remote from the electrode jaws (12) of the clamp arms (13) are acted on by an operation cylinder (30) which, via a link system (16, 16), gives the clamp a gripping movement about the link leg. The cylinder (20) with cylinder (30) and the clamp (14) commonly form a welding head which is pivotable about an axis (z- z) at right angles to the upsetting direction. By balancing operation pressure from the operation cylinder (30) and the counteraction cylinder (20) during swinging of the welding head about the axis (z-z), the clamp (14) is caused to follow the positional alteration, during the upsetting movement, of the portion of the chain link surrounded by the electrodes, this portion being simultaneously guided by the electrodes (12). The apparatus allows undisturbed current supply from the electrode jaws to the link without any slip, as well as improved guidance of the link portions during the upsetting sequence. |
