| 摘要 |
A method and apparatus for improving the distribution of a stream of incoming feed material onto the screen of a screening machine. The distributor apparatus includes a rotating, dished or cupped thrower surrounded by a fixed shroud. The shroud is of a cross-sectional area substantially larger than that of the thrower but substantially less than the surface area of the screening machine's top screen. The incoming material is discharged into the cup of the thrower, the rotation of which slings the material outwardly over the rim of the cup and against the shroud, in a more symmetrical angular distribution. A roof having directional vanes on it is interposed above the screening machine's top screen, and below the thrower and shroud. The infed material drops from the shroud onto the vaned roof, and the vanes direct it outwardly in a predetermined pattern toward the peripheral edges of the screening machine's top screen. Distribution asymmetries that would otherwise result from surges in the feed rate and/or off-center discharge of the infed material are minimized, and a higher throughput of infed material is achieved.
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