Marine crane lifting control

Details Marine crane lifting control Marine crane lifting control

B - Operations, Transporting

66

D

212/23.1

B66D 1/50 (2006.01) B66C 13/06 (2006.01) B66D 1/52 (2006.01)

Patent

CA 1164415

Abstract of the Disclosure A marine crane includes a high speed winch having a hydraulic heave compensating system that automatically controls the crane winch to compensate for the vertical movement of a load during offloading operations. The heave compensating system includes a reversing valve for overriding manual con- trol and for directing control pressure to stroke the pump of a hydrostatic winch drive into its raise mode of operation, and a compensating valve that regulates the displacement of the pump permitting it to develop and maintain only a prede- termined pressure in the high pressure main fluid line. The heave compensating system preferably includes a lift control system for automatically hoisting a heaving load only at or near the crest or trough of a wave.

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