Research And Application Of Automatic Control In Mine Filling

With the demand of mineral products is increasing rapidly, the exploration of the mineral resources leads to environmental deterioration and disaster, it has become to a nasty problem of environment and society. Therefore environmentalists have mine filling as one necessary step of mining in an ecology idea and make full use of waste materials in mine filling, people should make best use of the mineral resources and protect our prospective resource, decrease the waste products from the mine to an utmost degree, solve the problem of mining environment and ecological damage basically.The quality of the filling much depends on the concentration of slurry and the cement sand ratio. In the traditional filling system of the concentration of slurry and cement sand ratio, people always control the system with the conventional instruments, it leads to the instability in composition and affects the result of filling. In this paper, people design the automatic control system of the concentration of slurry and cement sand ratio according to the advanced technique of the automatic control:First and foremost, the paper analyzes the field feature of the concentration of slurry,the cement sand ratio and the level of water storehouse according to the process and the characteristic of the large time delay and nonlinearity in this mixing system; It also designs the control strategy of the expert- control of PID,double close-loop control and the dead-zone control of PID of meeting requirements according to the different requirements of the parameters of the concentration of slurry,the cement sand ratio and the level of water storehouse and ensures the quality of filling meets the need in industrial field; In the second place, it have research of expert-control algorithm in view of the concentration of slurry and simulate and compare the conventional control of PID with the expert-control of PID in the software of Matlab, the simulation results show the algorithm of expert-control of PID in dynamic characteristics and static error is better than the algorithm of conventional control of PID; In conclusion, the paper illustrates the implement of the expert-control algorithm in S7-300 PLC of Siemens by using the software of STEP7, at the same time, it adopts the method of structured programming to program the expert control rules of the concentration of slurry in ladder diagram language, it also gives the history curve of the concentration of slurry and the curve tells people the result of control is satisfactory.