Counterweight spacing altering device for rotating tower crane is implemented by variants in assembly without altering length or geometry of counter-boom

摘要

The counterweight spacing altering device is in the central part (3) of the crane, which has a T-shaped bending-beam boom. The spacing (11) between the counterweight (7) and the tower (8) can be altered by one or more variants of assembly of the central part, without altering the length or the geometry of the counter-boom (2).