| Nowadays, plastic processing machinery, such as the extruder and injection molding machine, is heating by many parts with various heating temperature setting. The common way of preheating is to open the heaters at the same time. Then each part keeps temperature after its temperature upto the setting value. Due to the defferent temperature setting and different heating conditions, the times of each part upto each temperature setting values are different. It makes the earlier arrival parts keeping temperature to wait for another parts upto the setting temperature. This behavior wast lots energy.After research, this paper designed a preheating control method by opening different parts' heater at different time. Through control the different heating period of each part, to arrive different setting temperature values at the same time. Thus reduceing temperature keeping time and saving energy.This paper mainly does the following researchs:The hardware circuit is consisted a temperature acquisition circuit, serial transmission circuit, relay control circuit and single-chip microcomputer control circuit. These circuits passed separate debug and joint commissioning. So far, the hardware of control system operation is good.The software design is divided into intelligent control platform and PC temperature control software. Intelligent control platform is consisted of A/D converter program, watch dog program and serial communication program. PC control software mainly includes temperature control algorithm, serial communication and temperature data storage programs.In the paper, two synchronous temperature rise control methods are designed to control the preheating. One is based on modeling, another is based one fuzzy control.The experiments prove that after several times of equipments' operating, synchronous temperature rise control method based on fuzzy control show the nicer control results than synchronous temperature rise control method based on modeling. |
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