The Study And Design Of Feedback Control System Of The Ash Of Clean Coal Of A New Discharging Machine On-line

The discharging system is so major that it directly affects the quality and productivity of product. Moreover, the discharging method plays a very important role in jigging separation. At present, the discharging of heavier production was the study emphasis, and the discharging lighter production has been neglected. Based on the discharging of the lighter one, my tutor develops a new type discharging machine whose discharging equipment can move with the separation density . On the basis of many experiments, the new machine has been tested to work as well as we expected before. But, without independent and assorted control device, by manually operation, the ability of self - control is very poor.According to the hypothesis of the principle of jig, there is no exactly mathematic model between the effect quality of the separation and thickness of the material bed, as well as the system of wind and water etc. It is a typically multivariate, time _varying and nonlinear complex system .The traditional control theory and method cannot control this discharge device effectively. In this paper, we designed ash feedback control system by way of fuzzy control technology, including automatic discharge control circuit according to floating mark and trimming circuit which sets the thickness of bed randomly according to the deviation of the ash of the clean coal .We use fuzzy control and PLC (programmable logic controller) and DK- YZ type operator. Practical use proved that by ash feedback of control way of clean coal, new-type discharging equipment increased the quality and productivity of clean coal in jig separation.