| 摘要 |
A gripping and rotating tong device for handling drill rods, drill bits and other corresponding, at least partially rod-like pieces. The tong device comprises a housing (11) fastened to a movable transfer device, the housing having an axial hole and a radial aperture (18) for taking the piece to be handled from outside the housing to inside it, and in the housing it has gripping means which grip the workpiece introduced into the housing, and parts for rotating the gripping means. The gripping means include at least two locking ring gears (1, 2) which rest in bearings rotatably in relation to the housing, at least one of them having cogging on the outer periphery and each having a notch (17, 16) extending to the center, along which notch the workpiece can pass to the center of the ring gears and away from there. The rotating of the ring gears is effected by at least one gear (3), the workpiece (20) centered with the ring gears (1, 2) rotating together with them. The centering and/or releasing of the workpiece is effected by a limited turning (k) of one ring gear in relation to the other ring gear, produced by the starting, ending or changing of direction of the rotation. |
