초록 ▼

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 fr

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.

대표청구항 ▼

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

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; anda 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, whereinthe 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; anda 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. 2. The kneading/extruding equipment according to claim 1, wherein the equipment further comprises a latter-stage pressure sensor for detecting a pressure of kneaded material on the inlet side of the latter-stage gear pump, the control device further comprises a rotational speed feedback control unit for the latter-stage gear pump, which feedback-controls the rotational speed of the latter-stage gear pump so that a pressure value output from the latter-stage pressure sensor is conformed to a predetermined latter-stage pressure set value, andthe rotational speed of the latter-stage gear pump is controlled by combining an output of the rotational speed feedforward control unit for the latter-stage gear pump with an output of the rotational speed feedback control unit for the latter-stage gear pump. 3. The kneading/extruding equipment according to claim 1 or 2, wherein the rotational speed feedforward control unit for the latter-stage gear pump performs the control by use of a manipulation amount signal generated by the rotational speed feedback control unit for the first-stage gear pump. 4. The kneading/extruding equipment according to claim 1 or 2, wherein the rotational speed feedforward control unit for the latter-stage gear pump performs the control by use of a pressure value output from the first-stage pressure sensor. 5. The kneading/extruding equipment according to claim 1, wherein a PID control based on a deviation between the pressure value output from the first-stage pressure sensor and the predetermined first-stage pressure set value is performed in the rotational speed feedback control unit for the first-stage gear pump. 6. The kneading/extruding equipment according to claim 2, wherein a PID control based on a deviation between a pressure value output from the latter-stage pressure sensor and the predetermined latter-stage set value is performed in the rotational speed feedback control unit for the latter-stage gear pump. 7. The kneading/extruding equipment according to claim 2, wherein the equipment further comprises a third-stage gear pump provided on the downstream side of the latter stage across from a further pressure loss generation device, and the control device further comprises a rotational speed feedforward control unit for the third-stage gear pump, which controls the rotational speed of the third-stage gear pump based on a signal from the rotational speed feedback control unit for the latter-stage gear pump. 8. An operation control method of kneading/extruding equipment comprising: providing 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 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 passes 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;a step in which the control device feedback-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; anda step in which the control device feedforward-controls the rotational speed of the latter-stage gear pump based on a signal related to the step of feedback controlling the rotational speed of the first-stage gear pump. 9. The operation control method of kneading/extruding equipment according to claim 8, wherein the kneading/extruding equipment further comprises a latter-stage pressure sensor for detecting a pressure of kneaded material on the inlet side of the latter-stage gear pump, and the operation method further comprises steps of:feedback-controlling the rotational speed of the latter-stage gear pump so that a pressure value output from the latter-stage pressure sensor is conformed to a predetermined latter-stage pressure set value; andcontrolling the rotational speed of the latter-stage gear pump by combining an output in the rotational speed feedforward control step for the latter-stage gear pump and an output of the rotational speed feedback control step for the latter-stage gear pump. 10. The operation control method of kneading/extruding equipment according to claim 8 or 9, wherein in the step of feedforward-controlling the rotational speed of the latter-stage gear pump, the control is performed by use of a manipulation amount signal generated in the rotational speed feedback control step for the first-stage gear pump. 11. The operation control method of kneading/extruding equipment according to claim 8 or 9, wherein in the step of feedforward-controlling the rotational speed of the latter-stage gear pump, the control is performed by use of a pressure value output from the first-stage pressure sensor. 12. The operation control method of kneading/extruding equipment according to claim 8, wherein in the step of feedback-controlling the rotational speed of the first-stage gear pump, a PID control based on a deviation between a pressure value output from the first-stage pressure sensor and the predetermined pressure set value is performed. 13. The operation control method of kneading/extruding equipment according to claim 9, wherein in the step of feedback-controlling the rotational speed of the latter-stage gear pump, a PID control based on a deviation between a pressure value output from the latter-stage pressure sensor and the predetermined latter-stage pressure set value is performed. 14. The operation control method of kneading/extruding equipment according to claim 9, wherein the kneading/extruding equipment further comprises a third-stage gear pump provided on the downstream side of the latter stage across from a further pressure loss generation device, andthe operation method further comprises a step in which the control device feedforward-controls the rotational speed of the third-stage gear pump based on a signal related to the step of feedback-controlling the rotational speed of the latter-stage gear pump.