公开(公告)号：EP0041345A3

公开(公告)日：1985-01-23

申请号：EP81302264

申请日：1981-05-21

申请人： RUSTON-BUCYRUS LIMITED

发明人： Dummer, Robert E.

IPC分类号： B66D01/52

CPC分类号： B66D1/52

摘要： 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 (59) for overriding manual. control valve (20) and for directing control pressure to stroke the pump (13) of a hydrostatic winch drive into its raise mode of operation, and a compensating valve (75) that regulates the displacement of the pump permitting it to develop and maintain only a predetermined pressure in the high pressure main fluid line (14). The heave compensating system includes a lift control system, comprising a lift selection valve (52), for automatically hoisting a heaving load only at or near the crest or trough of a wave.