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介绍了某选煤厂重介质比重自控系统的改造，讨论了可编程控制器ＳＵ—６在系统中的应用，简述了ＰＩＤ调节器和模糊控制在重介质比重（密度）调节中新的应用模式
This paper introduces the reformation of automatic control system of heavy medium gravity in a coal preparation plant, discusses the application of programmable logic controller SU-6 in the system, and briefly introduces the new application of PID regulator and fuzzy control in heavy medium density (density) regulation mode