An active heave control system (Fig 9, 100) used in marine, subsea lifts may be located between a crane or winch (Fig 9, 720) and the load to be lifted (Fig 9, 600). The device comprises a chassis (Fig1, 105) having a motor 200 and gears 210 that may drive a pair of leadscrews 160.Travelling beams 150 having ballscrews or ball nuts 165 may move towards each other or apart as the lead screws rotate. Movement of the beams in one plane is converted to movement of a scissor means 130 comprising a plurality of pivoting linkages 140 forming a parallelogram or pantograph arrangement in a plane perpendicular to the beams. The device moves in response to a signal from accelerometers in an MRU or motion response unit that, in conjunction with a control means (Fig 6) may be located in a container 300. The device may be connected to a lifting cable via a connector 120. Umbilical leads may also be connected to the device.
Active heave compensation apparatus
2022-06-15
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |