| 摘要 |
PURPOSE:To enable the titled method to obtain dwell to a target value always, by a method wherein a minor feedback loop performing feedback control of a number of revolutions is provided to a dwell feedback control device, to which a value obtained by operating a pressure deviation between the target value and a detected value is applied as a number of revolution instruction value. CONSTITUTION:Injection pressure to be applied to a screw 4 is detected by a load meter 22 and amplified by an amplifier 33 for the load meter into a dwell detection value (b). As for a target value (a) and the detection value (b), deviation is operated by an addition and subtraction operation device 27, a dwell deviation value (c) of which becomes a number of revolution instruction value (d) through PD operation by a dwell control meter 28 and the same which is applied to a minor feedback loop 34. The number of revolutions of a servomotor 2 is amplified by an amplifier 32 for detecting the number of revolutions and becomes a number of revolution detection value (e), a deviation (f) with the number of revolution instruction value (d) is operated by an addition and subtraction operating device 29, PID operation is applied to the same by a speed control meter 30 and the same becomes a torque instruction value (g), in a minor feedback loop 34. In addition to the above, an armature current corresponding to the instruction value (g) is applied to the servomotor 2 and advance thrust control of the screw 4, that is, dwell control of the screw 4 is performed. |
