| 摘要 |
<p>A sandmill includes rotary shaft (20), grinding media (15) and an outlet screen which is formed by a stack of rings (46) having projections and corresponding recesses stamped into them. The projections provide openings (62) between rings whereby flow passages between the rings are created. These passages permit the liquid being processed by the sandmill to flow out of the sandmill, but keep grinding media (15) in the mill. With the projections of one ring nested in the recesses of an adjacent ring, a small gap is provided. With the rings oriented to prevent nesting, a larger gap is provided. With the rings arranged so that the projections of adjacent rings abut each other, a still larger gap is obtained. This variable flow passage capability is further enhanced by varying the height of the projections.</p> |
