Hydraulic Power Unit (HPU) For APR Screw Press Hydraulic System

APR (Automatic Proportional Cone Control) Screw Press system is suit all makes of new or existing screw presses fitted with conventional electric motor – gearbox main drives. The hydraulic system runs continuously, exerting a continous pressure on the reaction cone through the hydraulic cylinder. Pressure level is governed by the loading conditions of the main drive electric motor. An electronic controller continously monitors the running amperes of the main drive electric motor and regulate the cone pressure accordingly through an electro-proportional pressure relief valve. The change in cone pressure is inversely proportional to the change in press loading so that pressing can be maintained constant as much as possible.

Advantages:-

The absence of nitrogen-filled bladder accumulator and pressure switch (commonly found in most conventional systems) makes this newly developed system compact, easy to operate and maintain. The hydraulic system is designed to last, as all the main hydraulic components selected are reliable and pressure rated above 200 bar whereas system working pressure is confined to below 100 bar. Response of the reaction cone is instantaneous to rapidly counter act on the change in press loading so as to help maintain constant pressing & minimise overloading. Adjustment of system pressure to suit a particular fruit condition is extremely easy via the control knob, The desire pressure is continously and accurately indicated on the glycerine type pressure gauge. Actual loading of the press is directly indicated by the main electric motor ammeter. In time of failure, the automatic system can be overrided manually to allow normal operation of the screw press under constant pressure mode. When overloading occurs, unloading of the press can be done by operating the directional valve manually to retract cones.