Patent ID: 7866630
Filing Date: 2011-01-11
Classification: A01K,B63B,B66D

Abstract:
1. A trawling method of towing a trawl net by winding off or winding up a right or left wire comprising: rotating a drum with a reversibly rotatable liquid-pressure motor, the drum having the right or left wire of the trawl net wound therearound; supplying hydraulic oil with a liquid pressure pump to the liquid-pressure motor; driving the liquid-pressure pump with an electric motor; and controlling a torque of the electric motor based on a variation in tension of the wire and winding off or winding up the right or left wire to keep right or left tension of the trawl net at a set value, and then keeping a length of the wire at a set value while the right or left tension of the trawl net stays at the set value.