| 摘要 |
A grinder is disclosed which has a housing ( 12 ) in which a rotatable disc ( 60 ) is mounted. The disc ( 60 ) is rotated by a motor ( 40 )and the disc ( 60 ) has a periphery which is adjacent an inner stationary wall ( 102 ) of the housing ( 12 ). An air inlet ( 108 ) is arranged below the disc and the disc carries vanes ( 100 ) so that when the disc rotates, an annular air stream is created at the periphery of the disc in which a grinding zone is established between the periphery of the disc and the stationary wall ( 102 ) for grinding material into small particles. The grinding zone includes an annular flow of heavy gas R<SUB>1</SUB>. A material inlet ( 20 ) is provided for allowing material to enter the housing ( 12 ). Large material is grounded by energy intensification after it hits the disc ( 60 ) and collides with the inner wall ( 40 ) of the housing so as to break down the material into smaller particle size, which can then move to the grinding zone at the periphery of the disc ( 60 ) to be further ground into small particles. The small particles are collected through an outlet ( 16 ) and may be supplied to separators for separating the small particles from exhaust air from the housing ( 12 ).
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