Hydraulic transmission–multiplier drive with dosing modules

Simple pump drives with constant-supply pipes are widely used in manufacturing and metallurgy today. Better performance may be obtained by means of transmission–multiplier drives. Such drives are characterized by more uniform load distribution between the pumps, lower working pressure, and hence lower motor power. When two-cylinder drives are employed, the two cylinders must be synchronized. This may be accomplished by employing transmission–multiplier modules in the drive’s control system; the modules operate in transmission mode during the idling pass and in multiplier mode during the working pass. The development of two-speed and three-speed transmission–multiplier pump drives is considered, with modular hydraulic dosing units that operate in transmission mode during the idling pass and in multiplier mode during the working pass.