| 摘要 |
<p>A stationary screen (14) of cylindrical or frusto-conical form is mounted inside the downstream end sifting section (10B) of a machine housing (10) which also has an upstream end feed section (10A). An auger screw (24) is provided in the upstream end section (10A) on a shaft (20) which is rotatable so as to feed material to be sifted into an end of the screen (14). The shaft (20) is mounted in cantilever manner from the upstream end of the housing (10) and drive means are mounted at or near the upstream end of the housing to rotate the shaft (20). A paddle assembly (26) is provided in the downstream end section (10B), inside the screen (14), and is mounted to the same shaft (20) as the auger screw (24). This shaft (20) is a hollow shaft. A second rotatable shaft (30) extends through the first hollow shaft (20) and projects beyond the first hollow shaft into the screen (14). A separate inner sieve (40), also of cylindrical or frusto-conical form, is mounted to the second shaft (30).</p> |
