| 摘要 |
1,260,187. Vibrating screen separator; sifting apparatus. SWECO Inc. 26 March, 1969 [3 April, 1968], No. 15744/69. Headings B1D and B2H. A screen assembly, for separating liquids and solids or grading dry solids, comprises a stack of flat screens 30, 40, 41, 42 mounted on a common plate 4, which is vibrated by motor 7 with out-of-balance weights 8, 9, at least some screens operating in parallel and having incoming material supplied thereto from pipe 79. In Fig. 1, all screens operate in parallel and material passes on to a pair of dishes 66, 67, with apertures whose effective area is adjusted by rotating one dish upon the other to determine the fraction of material which falls therethrough. This fraction is divided by baffles 57, 56, which project inwards and divert successive fractions of material through apertures 65, 64 on to screens 41, 40. Material which overflows from dishes 66, 67 falls on to screen 42, and material passing baffle 56 falls on to screen 30. The fraction passing through the screens falls on to convex pans and passes to outlets 27, 28. Similar outlets are arranged at right angles to the plane of Fig. 1a to gather material which fails to pass through the screens. Fig. 2a (not shown) illustrates such an arrangement in a two-screen separator. The lower screens are commonly more efficient, since their vibrations are of greater amplitude, so dishes 66, 67 may be adjusted so that screen 42 receives less than one quarter of the incoming material. Figs. 3, 4 (not shown) illustrate alternative means for distributing material to different screens. Fig. 5 (not shown) illustrates a four-screen separator wherein two coarse screens operate in parallel and material passing therethrough is further classified by respective fine screens below, producing three fractions in all. |
