| 摘要 |
A reeving apparatus for a crane having an overhead frame, a lifting beam subject to swaying forces, and a winding drum mounted on the frame for raising and lowering the lifting beam. First, second, third and fourth spaced apart rotatable sheaves are mounted on the lifting beam for supporting the lifting beam. The first and second sheaves are spaced apart in directions horizontally transverse to a longitudinal axis of the drum. The third and fourth sheaves are positioned generally below opposite ends of the drum. Alternate ones of the sheaves comprise single sheaves having first and second grooves and the other ones of the sheaves each comprise a pair of sheaves each having single grooves. A plurality of ropes are affixed to the drum and to the overhead frame, and each one of the plurality of ropes is wrapped around one of the sheaves for supporting the lifting beam together with the sheaves. The plurality of ropes includes first and second ropes extending to and wrapping around the same alternate one of the sheaves in one of the first and second grooves for generating friction forces with the alternate one of the sheaves in response to swaying movement to thereby dissipate swaying energy. The first and second ropes also each wrap around a single groove of a pair of sheaves of a different other one of the sheaves for supplying rope to the alternate ones of the sheaves to allow limited swaying movement of the alternate ones of the sheaves.
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