| The drum type of grinder system is the important link of industry such as refractory material, cement and thermal power; it has many advantages such as wide and applicable range, stable performance, high grinding fineness, but it is one of the main power consumption link. Currently, the control of grinder system most use the method of artificial control, there is no guarantee that the grinder always run under ideal conditions, lead to the result of the low efficiency of production, large electricity consumption and poor economic benefits. The significance of this topic is to reform the automation of the drum type of grinder system, make it always been able to keep running under ideal conditions, increase production capacity, in order to achieve the purpose of reducing energy consumption. Another meaning of automation transformation of drum type of grinder system is to make the system run more safely and reduce the labor intensity of operators.This paper firstly carries on the theoretical study of the drum type of grinder system, secondly analyses the rotating speed of grinder, induced draft fan speed, charging mode, the moisture and particle size of raw material, and the influence of grinding medium on the production efficiency. Obtained that the relevant specification parameters such as tube diameter, length and speed is established when the drum type of grinder is once established in actual operation, in determining the material characteristics and shape, size, ratio of filling amount, level, transshipment of grinding media materials, we can think of the grinder feeding way and the classifier’s opening impact on production efficiency is constant. So the main factor influencing the drum type of grinder production efficiency is material level.There are many measurement method of drum type of grinder level, but due to the delay characteristics of system and strong coupling among various factors, and all kinds of methods of measuring the material level has certain shortcomings, in addition to the reasons of the interference are also more, therefore, this subject respectively collected grinder barrel vibration signal, noise signal, and export materials temperature, working current, import and export pressure and temperature and output data in the case of different feed motor speed, and carried on the comprehensive analysis to the actual data collected, and finally decided to adopt a combination of multiple signal detection method to realize the measurement of material level.Drum type of grinder system is a multi-input, multi-variable, strong coupling, large inertia big delay of time-varying system, in the process of operation adjustment, the various parameters influenced each other, it is difficult to find a key to the balance of achieving automatic adjustment, it is difficult to establish mathematical model, this paper selected to base on fuzzy control theory, design the fuzzy controller of drum type of grinder system, and won lookup control table through the center of gravity method, provided the basis for the realization of the fuzzy control on the software.This paper adopts ARM (type of STM32F103ZET6) as the central processor, designed the control system based on ARM and the fuzzy control technology, completed the hardware design includes the selection of sampling sensor, AD sampling circuit design, the selection of the LCD displayer, and formed a speed feedback with measurement of feeding motor speed; Meanwhile, completed the writing of the software program, mainly including system initialization program, sampling procedures, fuzzy control, LCD display and touch screen button handler. At last, verified the feasibility of control system through online experiments. |
PDF Full Text Request