GB990641A - Improvements in or relating to separators - Google Patents

Abstract

990,641. Mechanical separators. ZAKLADY KOKSOWNICZE VICTORIA. Feb. 7, 1962 [Feb. 7, 1961], No. 4731/62. Heading B2H. A separator for granular material comprises a feed hopper 1, with a vertical shaft 9 passing through the centre of the hopper, driven from a belt pulley 14, a rotor 4 on the shaft 9 having blades 5 arranged perpendicularly to its upper horizontal surface, and inclined to the radius of the rotor 4 and a stationary comb member arranged concentrically around the rotor 4. Material to be separated, e.g. moist coal of different size particles, is fed down the hopper 1 on to the rotor 4. The blades 5 are disposed round the edge of the rotor 4, so that the coal particles are thrown off the edge of the rotor 4. The coal particles then impinge on the comb member which may be either constructed of tensioned steel wires or synthetic fibres 7<SP>1</SP> stretched between rings 6<SP>1</SP> or may be constructed of vertically disposed plates 7, Fig. 4A, fixed to a ring 6. The plates 7 are disopsed at the angle at which the coal particles leave the edge of the rotor 4 and are spaced such that small particles pass between adjacent plates to fall into a chamber 16, whilst larger particles strike the inside edges of the plates 7, which are inclined at about 45 degrees to the horizontal and are deflected upwards into a chamber 17. Where wires 7<SP>1</SP> are used in place of the plates 7, these are also inclined to the horizontal. In an alternative embodiment, the plates or wires may be inclined downwardly away from the rotor 4 so that the smaller particles pass to the chamber 17 whilst the larger particles are deflected downwardly into the chamber 16. This is shown in Fig. 1 where in fact two sets of wires 7<SP>1</SP> are provided one above the other. If the coal is moist then the smaller particles may stick together in which case they may only be broken up by impinging on the upper set of wires 7<SP>1</SP> but need not necessarily pass through. In this case they will be deflected down on to the lower set of wires 7<SP>1</SP> and the broken-up smaller particles can then fall into the chamber 17. Where two sets of plates 7 are used, the surfaces of the lower set are arranged radially with respect to the rotor. Furthermore, after passing through the single combs or vertically spaced sets of combs described above, the particles may be made to impinge on a similar comb or set of combs disposed radially outwards from the first mentioned or inner combs. The spacings in these outer combs are smaller than those in the inner combs so that the coal particles may be divided into three fractions. The height of the bottom edge of the hopper 1 may be adjusted relative to the rotor 4 in order to control the rate of passage of material through the apparatus.