Research On Intelligent Control System Of Grinding Grade

In mineral processing, the process mechanism of grinding and classification is complex, and the influence factors are many, and the ore properties are changed frequently,Manual operation is difficult to obtain the optimal effect. The goal of the grinding operation control is to ensure that the mill product is qualified, and to maximize the processing capacity of the ball mill and reduce the labor intensity of the workers, and to stabilize the follow-up selection index,in order to reduce consumption and increase labor productivity. The key to the control of grinding operation is the measurement and control of the load of the mill, Existing detection methods can not accurately obtain the relevant data of mill load,this can not make full use of the control efficiency of grinding operation.In the actual production process, workers often through the operation experience to get better production effect,Combine rich experience with advanced control technology,Research and development of advanced grinding classification intelligent control system,It has an important role in improving the automation, information management level and improving the operating efficiency of the grinding and classification. The level of automatic control of grinding and classification in China has a certain gap with the advanced level of the world,The control of grinding classification in China is a single loop control, and the world leader in automation system has been integrated control and management of the whole plant. The future development of grinding classification control will be intelligent control.That paper by nalysis and comparison of the existing measurement method of the load capacity of the mill,the technology and method of the existing wet ball milling classification industrial control are summarized.Through the research on the operating characteristics of the ball mill, Raise that the main factor affecting the grinding efficiency is to give the amount of ore, water quantity, medium filling rate, medium ratio. Using the least square method to establish the mathematics model of current value and mill load.Use Yunnan Lvchun Xintai Mining Co. Ltd. mill grinding and classification as research object.Judging the state of the mill load by detecting the noise of the ball mill,the interval value of the mill load is judged by the electric current value of the ball mill. At the same time, the change of the load capacity of the mill is predicted by using the spiral classifier electric current. Using the least square method to establish the mathematical model of current value and mill load, in order to judge the running state of the ball mill.Control system according to the complexity of the control loop using different control algorithms, simple control loop (such as to mine, water) using PID control, complex control loop using intelligent control.By means of mathematical model, the water flow rate and the amount of water in the mine are adjusted to control the grinding concentration. The PID cascade control method is used to control the graded overflow concentration and fineness. The complex grinding and classification process is controlled by step by step, and the whole process is decomposed into separate feeding loop, feed circuit, load control loop.This article main think of advanced, practical, economical. Designed distributed control system for centralized management of decentralized control, Lower machine in charge of control,upper computer in charge of management. In order to achieve high performance ratio, Control system key equipment using the famous brand of imported products,oher domestic products,Constructed a distributed control system with high reliability, good stability and strong adaptability. The lower computer uses SIEMENS S7-300PLC, the upper computer uses the industrial computer, the configuration software uses Kingview6.55.Control system has excellent control function and monitoring function, the monitoring interface is rich, the display is intuitive and easy to operate, and remote monitoring is carried out through web. The intelligent control of the grinding classification process is realized, and the information management level of the grinding and classification is improved.