The paper is to introduces FUZZY-PID controller in electronic conveyor scale for quantitative feeding purpose, and elaborate Fuzzy-PID control algorithin, and the designing of hardwares and softwares of coneroller design.

The article have introduced the applicationed of POLDOS pneumatic elevator in industrial process, explained the theory of ration feeding, and given the solution, according to the problem of throughput rate which the BaoSteel met during the course of increased output at suspend kiln.

In China,the traditional feeding process of zinc powder in purification procedure was manual hydrometallurgy field,and a small size fixed quantity feeder to carry out the zinc powder feeding continuously and measurement automatically was used in the Qujing Zinc plant successfully.