DESIGN amp; DEVELOPMENT OF DOUBLE COMPARTMENT WINCH WITH ROPE SYSTEM FOR LAUNCH amp; RETRIEVAL OF TELESCOPIC STRUCTURAL FRAMES

摘要

The Launch & Recovery System will launch an object at a required depth in the sea from the deck of ship & will retrieve it when required. The Launch & Recovery System comprises Sliding platform, Telescopic Launch frame, Tilting platform, Launch pad & Hydraulic systems. During launching & retrieval operation, the winch is required to ensure the controlled movement of the Telescopic structural frames sequentially. The connected structures are required to be operated without having slackness in the ropes. This operation would require two winches, i.e., one for launching and another for retrieval. On account of this, actual purpose of sequential operation during launch & retrieval will not be achieved. For ensuring this operation, there should be an external control system which would be able to synchronize both winches. External control system requires electronic controls to regulate the oil flow to maintain the uniform velocity between the two winch drums. This proposal requires more space & also adds to the system cost. Hence, it is necessary to design & develop a double compartment winch with rope system to meet the requirement of launch & retrieval for the telescopic structural frames sequential controlled movement. A double compartment winch is designed to operate Telescopic structural frames during launching and retrieval operations. A partition in the winch drum is created to accommodate the launch and retrieval ropes. The design is such that rope in the launch compartment unwinds & simultaneously winding of rope will take place at retrieval compartment and vice-versa. The rope routing in double compartment winch is carried out with adequate tension in the wire ropes by using tension pulleys and idler pulleys at various places. Because of this, it was possible to meet the objective of synchronized sequential operation during Launching & retrieval. The usage of modified single winch in turn, resulted in considerable saving of space by almost 50% and also brought about cost savings to the tune of about 38% as against the proposal for using of dual winches of same capacity & external control system.