Patent GB-223279-A (GB)
Title: Process and apparatus for separating intermixed divided materials of different specific gravities
IPC: B03B4/02
Filed: 1923-06-21
Abstract: 223,279. Peale, R., Peale, R., and Peale, R. June 21, 1923. Separating by shaking-apparatus; pneumatic separating.- Apparatus for separating granular material of the kind in which the material is stratified by shading it and simultaneously subjecting it to upward air pressure, the various strata being thereafter discharged at different points, comprises a number of long, narrow troughs 10, provided with bottoms 12 of air-pervious material which form the tops of air-pressure chambers 19, and with floating plates 56 the function of which is to deflect the air laterally and discharge, the top layer of the stratified material. The sides of the trough may be parallel or divergent to front or rear, and adjustable in height, and the plate 56 may be entirely free, hinged to the front of the hopper 1 or be in hinged sections. At the front end of the plate 56, and integral therewith or not, is a baffle plate 57 which prevents longitudinal movement of the upper strata and assists in their lateral discharge. A second baffle plate 76 forms with the plate 57 a collecting chamber for any of the material of the upper strata which has passed the plate 57 and a loose floating plate 70 causes the lateral discharge of this material. Forward of the plate 76 is a downwardly and rearwardly inclined plate 84 the function of which is to deflect the air current passing through the forward end of t'he trough bottom in a rearward direction and prevent the passage of the lighter strata beyond the plate 76. The heavy material in the lower stratum is discharged by the shoot 88. The plates and baffles may be duplicated along the. length of the troughs, weights may be applied thereto, and the material discharged may be sized by arranging a series of shoots at suitable points. The material is fed from a hopper 1 with pervious sides and back so that' the air passing into the hopper exerts a cleaning action on the material, the dust being removed by suction apparatus 5. The feed of the material is regulated by a shutter 43 and the air current at the rear and front of the trough by slides 40, 90. The troughs are carried by a frame 110 which is supported by springs 116 on an adjustable bed 120 and is oscillated vertically and horizontally by electromagnets 134, 152. In a modification, Fig. 14, the rear portion of the trough is covered by a perforated arch 191 open towards the front. The sides 194 of the trough are increased in height at the forward ends and are provided with a second arched cover 199. An adjustable baffle and air deflecting plate 202, 203 is provided at the forward end which is closed by a hinged and weighted gate 207. The bottom of the trough is provided with a portion 201 of more open mesh. The air deflecting plates may be dispensed with in this construction. In a further modification, Fig. 27, the end of the trough is closed by divergent plates 234 forming one side of two passages 235 leading to discharge shoots 239. The heavy material passes through openings 229 at the. bottom of the lateral walls 194 and accumulates under a floating plate 236 until the latter rises sufficiently to open a discharge aperture at the top of the end of the passage 235. The bottom of the passages 235 is of perforated material and is open to the pressure of air in the chamber 19.