摘要:
The device is applied to a crane having a tower (1) to which a main boom (1a, 1b) is connected, and one or more hydraulic extendable sections (2, 3, 4, 5) moved by hydraulic actuators (2a, 3a, 4a, 5a), and a winch (10) on which a cable (11) is wound, the cable (11) having a hook (12) connected to an end. The winch (10) is solidly constrained to a frame (13) which can make small movements with respect to the crane structure. The movements are opposed by means for detecting, of known type, which generate a signal that is proportional to stresses generated on the cable (11) and which commands activation of actuators operating movements of the boom and sections of the crane.