湿式ボールミル粉砕閉回路制御系の制御特性について
湿式ボールミル粉砕回路の制御に関する研究 (第3報)
1969 年 85 巻 977 号 p. 791-794
詳細
1969 年 85 巻 977 号 p. 791-794
Some investigations were carried out on the characteristics of a control system applied to a closed grinding circuit consisting of a wet ball mill and a hydrocyclone. Principally the phase margin was introduced as a criterion in evaluating control quality of the system. In this case it was determined on the Bode diagram of the open loop transfer function of the system optimized by Ziegler-Nichols' method.
Conclusions thus obtained can be summarized as follows.
1) It was found that misplaced fine particles in the cyclone underflow reduced the quality of the control system.
2) The two different controlled variables-the circulating load and the cyclone feed-were compared from the viewpoint of control. Under the conditions considered here the former variable seemed to be preferable.
3) Even in the case, however, when the latter should be adopted as the controlled variable, the system can be improved by applying the so-called ‘cascade controlling method’.
