| 摘要 |
An apparatus for reducing and crushing coarse material comprises at least two rollers (3,4) in side-by-side substantially parallel relation which can be driven such that material supplied from above is discharged downwards between the rollers. Provided on the rollers are ribs which effect a reduction and crushing of the material supplied. The ribs of a first one of these rollers (3) are formed by two screw threads (8,9) having opposite leads for conveying material that is fed substantially centrally above the rollers laterally outwards in either direction, while the ribs of the second one (4) of these rollers are formed by oval disks (10) which are obliquely provided around the roller and which, when the roller is driven, perform a reciprocating movement, viewed in axial direction, causing a shearing and clearing movement between the oval disks (10) and the screw threads (8,9). <IMAGE> |
