METHOD FOR AUTOMATIC CONTROL OF EXTRUDING PROCESS IN SCREW EXTRUDER Russian patent published in 1998 - IPC

FIELD: automation of production processes; may be used in automation of material extruding on screw extruders. SUBSTANCE: method includes measurement of oil content in initial product and oil cake, temperature of initial product, consumption of initial product and oil yield. Additionally includes are supply of coolant for cooling of extruder working chamber; measurement of average integral temperature of extrusion zone, flow rate of coolant, power consumption by regulated drive of extruder. By measured values of oil content of initial product and oil cake, current value of their ratio is determined, and it is used for setting the screw rotation speed by acting on power of regulated drive with correction of oil content ratio by the current pressure value in the last stage of extrusion zone. Temperature of initial product is used for setting the flow rate of coolant with correction by value of average-integral temperature in vertical section of the last stage of extrusion zone. When current value of pressure reaches the maximum value, the speed of rotation of extruder screw is reduced, and temperature of heating of product in zone of extrusion is stabilized by regulation of coolant flow rate for cooling of working chamber with correction by current value of temperature of initial product. EFFECT: reduced energy losses per unit of weight of produced oil and higher quality of extrusion process. 2 cl, 2 dwg