Kneading/extruding equipment with feedforward control of latter stage pump

摘要

The present invention provides kneading/extruding equipment capable of stable operation by keeping the pressure of kneaded material before a first-stage gear pump in steady operation (molding) and preventing fluctuation of the pressure of kneaded material before the first-stage gear pump constant from largely affecting the pressure of kneaded material before a latter-stage gear pump at start-up or upon change of production rate, and thus capable of responding to an increase in production rate while securing a high-quality molded product, and an operation control method thereof. The kneading/extruding equipment comprises: a rotational speed feedback control unit for a first gear pump, which feedback-controls the rotational speed of the first gear pump, and a rotational speed feedforward control unit for a second gear pump, which feedforward-controls the rotational speed of the second gear pump.

主权项

1. Kneading/extruding equipment, comprising:
a raw material feeder; an extruding machine which kneads and extrudes raw material supplied from the raw material feeder; a first-stage gear pump for pressure-raising the kneaded material, which is provided on the downstream side of the extruding machine; a pressure loss generation device through which the kneaded material discharged from the first-stage gear pump is passed and which causes a pressure loss in the kneaded material during the passing; a latter-stage gear pump for pressure-raising the kneaded material discharged from the pressure loss generation device; a first-stage variable-speed motor for driving the first-stage gear pump; a latter-stage variable-speed motor for driving the latter-stage gear pump; a first-stage pressure sensor for detecting a pressure of kneaded material on the inlet side of the first-stage gear pump; and a control device which controls the rotational speed of the first-stage gear pump through the first-stage variable-speed motor and controls the rotational speed of the latter-stage gear pump through the latter-stage variable-speed motor, wherein the control device comprises: a rotational speed feedback control unit for the first-stage gear pump, which feedback control unit controls the rotational speed of the first-stage gear pump so that a pressure value output from the first-stage pressure sensor is conformed to a predetermined first-stage pressure set value; and a rotational speed feedforward control unit for the latter-stage gear pump, which feedforward control unit controls the rotational speed of the latter-stage gear pump based on a signal from the rotational speed feedback control unit for the first-stage gear pump.