| 摘要 |
A pipe-rolling head comprises a body (3) rotating around a respective rolling axis (X); at least three roll-holders (5) mounted on the rotating body (3), each adapted to receive a respective roll (6); the rolls (6) are freely rotatable around respective rotation axes (Y) that are substantially parallel to the rolling axis (X). The three roll-holders (5) are movable in translation relative to the rotating body (3) between an open position at which the rolls (6) lie spaced apart from each other and from the rolling axis (X), and a closed position at which the rolls (6) lie close to each other in the vicinity of the rolling axis (X), to encompass a pipe (2) to be rolled which is coaxial with the rolling axis (X). The head further comprises means (4) for setting the rotating body (3) in rotation and means (9) for actuating the roll-holders (5) between the open position and the closed position. The means (9) for actuating the roll-holders (5) comprises at least one ball-bearing actuator (10) kinematically connected with the roll-holders (5) to cause translation of the latter between the open and closed positions. |
