| 摘要 |
<p>903,831. Pneumatic separation. BELL INTERCONTINENTAL CORPORATION. April 5, 1960 [Aug. 4, 1959], No. 11968/60. Class 117. Dust is removed from abrasive granules &c. in a machine having a hopper 14, fed by a spout 15 with the mixed material, and a feed control disc 18 located below the hopper outlet. The hopper and disc are suspended by a rod 20 connected to a rocker arm 22 fulcrumed at 24 and held by tension springs 26, 28 ; in the non- operative position the hopper and disc are urged upwardly and the material is prevented from spilling over the edge of the disc by a vertically adjustable collar 17 around an opening in the machine casing. When a sufficient quantity of material accumulates in the hopper, the assembly moves downwardly against the action of the springs and material flows over the edge of the disc and then over the edge of a plate 32 having a vertical sleeve portion 30. Material thus flows across a gap between the plate and the rim 40 of a cylindrical housing 34 provided with a hopper 36 and spout 38. An air intake pot 45, open at its top, is connected by a duct 46 to the inlet of a fan 50, and the fan outlet is connected to the machine casing. With the fan in operation air is directed around the casing above a canopy 42 and then passes inwardly and down into the said gap whereby dust is carried away from the main stream which falls to a hopper 68. The air and dust stream flows first downwardly through an annular passageway between the housing 34 and a baffle 39 and then upwardly to the top of the pot 45 ; the heavier particles in the stream fall to the hopper 36 and spout 38. A dust control valve 48 may be mechanically connected to the rod 20 so that the rate of air flow through the system automatically varies in proportion to the flow of material through the machine. Instead of a closed circuit system the duct 46 may lead to a dust collector, and an air inlet may be provided in the machine casing.</p> |
