基于PLC技术的轧花自动控制系统的设计与研究

Design and Research of the Ginning Automatic Control System Based on PLC Technology

结合国内外的主要控制方法,针对新疆当地轧花自动控制方式较简单、轧花效果较差等缺点,利用西门子小型PLC控制技术,设计了一种可根据籽棉回潮率范围、籽棉卷密度变化进行控制轧花机转速的自动化控制模型,并进行了整个PLC系统的设计;结合设计思路,利用研制的控制系统对小型轧花样机进行了轧花试验。结果表明:轧花机转速的变化根据回潮率范围的设定从650r/min至1140r/min匀速稳定变化,实现了多段转速的控制。与变频器频率对照,系统运行稳定、可靠;籽棉卷密度的变化能通过电机电流进行反馈,实现了对转速的进一步修正。

According to the Xinjiang local ginning automatic control mode is simple and ginning effect is poor , a kind of automatic control model of according seed cotton moisture regain and winding density to control the speed of cotton gin -ning machine is designed by utilizing miniature Siemens PLC control technology and the main control method at home and abroad .The design of the whole PLC system is accomplished .A small cotton ginning prototype is manufactured by combi-ning design ideas .The results of ginning test shows that the change speed of the cotton gin is uniform in that set of mois -ture regain from 650r/min to 1140r/min.Multi speed control is realized.Compared with the frequency of transducer , the operation of the system is stable and reliable; The feedback of variation of seed cotton winding density can be get through the motor current , the further modification to speed is realized .