Реферат: 1375682 Controlling winches HYDRAULIK BRATTVAAG AS 12 April 1973 [18 April 1972] 17632/73 Heading B8B [Also in Division G3] An hydraulic system for two co-operating trawling winches 10A, 10B for automatically exerting like tensile forces in the wires thereof, comprises for each winch, an hydraulic pump 13A, 13B, a control valve 15A, 15B and an hydraulic motor 12A, 12B for driving the associated winch drum, the system further comprising a control means monitoring the wires so that any externally influenced difference in wire tension controls the winches to balance the tensions in the wires. The control means comprises a manually set pressure limiting valve 40 which through a two way valve 38 exhausts pressure from one side of either of two further pressure limiting valves 23A, 23B associated with each motor 12A, 12B permitting the valve 23A or 23B to directly couple the motor driving pressure line 16A, 16B to the motor return line 17A, 17B to by-pass the appropriate motor. This removal of power to the motor will occur to either, or both motors if an overload is applied to one or both winch wires, the drive being restored when the wire tension drops below a level corresponding to the pressure setting of the valve 40, the motors freewheeling to release the wire tension during this period. When setting the trawling wires 100A, 100B control valves 15A and 15B are at stop, a check valve 50 is opened to connect the input lines 16A, 16B to both motors 12A, 12B, whereby the motors are hydraulically balanced and pay out equal quantities of wire automatically. The valve 40 is set at a low enough value permitting the valves 23A and 23B to open to allow the motors to pay out due to water resistance on the trawl. During the trawl, the valve 40 is set to a value permitting pay out from a winch only upon excessive tension occurring in the wire, the open check valve 50 permitting minor variations in the wire tensions to be equalized. By closing the valve 50 the winches are independently operable. In the embodiment of Fig. 3 (not shown), tension variation between the trawl wires is sensed by pulleys over which the wires run, the pulleys being mounted on hydraulic piston and cylinder units whereby fluid is displaced proportionally to pulley movement to control the pressure limiting valves associated with the winch motors. In the embodiment of Figs. 4 and 5 (not shown), tension signals from the trawl wires are fed to a converter for comparison, and whereupon appropriate signals are sent to the motor control valves to equalize the wire tensions.