Automatic Adjusting And Control System Of Air-valve Parameters Based On Loose Detection

Jigging separation is an important way of coal processing . As the key device of jigger, the reliability of electromagnetic air-valve affects the function of the whole machine, and the automatic control of air-valve is the important part of the automatic control of the jigger. Jigging process is very complex, and all the factors affect each other, jigger driver must adjust the air-valve parameters based on material, volume, wind pressure, bed thickness and his own experience. People are concerned with the control process, which is difficult for the normal control method. So the automatic control of air-valve need intelligent control method, and need import human knowledge and intelligence into control system.This article gives expert system control of jigging air-valve. Expert system is an intelligent reasoning system based on knowledge, which combines artificial intelligence with domain knowledge, and is related to KA, database, reasoning system and interface between human and computer. Expert system is widely used , and can improve the working efficiency and quality. The knowledge comes from expert experience, field data and experiments. Expert system deduces intelligently based on feedback bed-layer density and buoyages signals and expert knowledge, and then modifies the air-valve parameters accordingly, so we can get the right air-valve parameters.Windows 2000 is the development platform of this expert system, and Visual Basic 6.0 is the development tool, so we get the whole expert system. We make use of object-oriented programming technique based on DAO model and set up the repository of expert system using Microsoft Access database. At the same time this article gives the operating method of the expert system. This system has some characters, such as friendly interface, easy operation, good intercommunion between human and computer, topping automatism, good reasoning ability. So the system has beautiful future.