DRIVE DEVICE FOR A BENDING PRESS

摘要

The invention relates to a drive device (1) for a bending press (3), in particular a press brake (2), comprising a press frame (10) having a stationary press beam (2) and having a press beam (4) that can be moved relative to the press beam (2) by means of a beam adjusting device (6) formed by a closed hydraulic system (5), comprising a hydraulic pump (46) having a controllable drive motor (47), at least one control valve (48), and at least one hydraulic linear actuator (7). The linear actuator (7) comprises a first piston arrangement (25) having a first piston (27) that divides a cylinder chamber (34) into a first pressure chamber (35) and a second pressure chamber (37) and, in a further cylinder chamber (39), a second piston arrangement (26) having a further piston (28) and at least one further pressure chamber (40). The first piston arrangement (25) and the second piston arrangement (26) are coupled to each other.