This disquisition is about the general situation of the stuff load and distribution equipment on the blast furnace bell-less top, and expatiate on the design characteristics and the problems of the vital equipment such as sealed valve, flow control valve and stuff distribution facility in the two advanced type bell-less top equipment (parallel hopper type and series hopper type) in the world.

As a method widely used in separation coal, jigging technology has direct and important influence on the quality and output of coal product Emphasising on discharging of light product, we develop a new type discharging device which act on the discharging part of jigger and can follow the pulse of the separation line of density.