The screening process has been done by screening machine. There are lots of screening machines. According to their structures and movements characteristics in the mining industries, the screening machine can be category into below types:
(1) Fixed screening machine: including fixed screening machine, fixed- grizzly bar, hanging grizzly bar and arc grizzly bar.
(2) Cylinder screen: including cylinder screen, cone screen and angle screen.
(3) Horizontal vibrating screen.
(4) Vibrating Screen: it has two types, one is mechanical driving, another one is electrical driving. The former driving mode contains screens like eccentric screen, inertia vibrating screen, self-fixed vibrating screen, linear vibrating screen and resonance screen. The latter one contains electrical screen.
Among above screening machines, the fixed screen and bar screen has simple structure without any movable structure that ensures their stable performance, which is widely used in the screen process of large block material. The cylinder screen usually applied in sand washing and construction industries. Horizontal vibrating screen is mainly used in coal and non- mineral screening and dehydrating process. Since the low production and efficiency of the horizontal screen, they have been replaced by vibrating screen. Self centering vibrating Screen and resonance screen has large production rate and efficiency with low energy consumption, which is widely used in mining industries. The NS series high-efficiency circular vibrating screen, linear dehydration screen and eccentric vibrating screen produced by Luoyang Dahua Heavy Type Machinery Co.,Ltd has been widely used by domestic and international customers and being spoken highly of.