Double-motor, four-rope grab winch for a floating grab plant for sand and gravel extraction with mechanical or hydraulic energy storage device

摘要

In the mechanical embodiment, a counterweight is lifted during the lowering of the grab via a rope tackle system. The counterweight stores the released energy and feeds it back to the winch mechanism during the lifting of the grab. In the hydraulic embodiment, the energy produced is converted into hydraulic energy during the lowering of the grab. The conversion is effected via a hydraulic pump which is coupled to the lifting motor via a freewheel clutch and feeds the energy back to the lifting motor via a hydraulic motor. After the rated speed of the lifting motor is reached, the hydraulic motor, which is connected to the gearing via a multiple-disc clutch, is disengaged and made pressureless.