A sheave device retracting and unfolding step includes winding and unwinding a rope by a winch, with a lifting side sheave device lifted by an assist crane. A tension information detecting step includes detecting rope state information on the rope when the sheave device retracting and unfolding step is performed. A tension information using step includes performing at least one of notification to a worker and drive control of the winch based on the rope state information detected in the tension information detecting step
SHEAVE DEVICE RETRACTING AND UNFOLDING METHOD
2025-05-22
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |