Classifying – separating – and assorting solids – Electrostatic
Patent
1974-02-20
1976-02-03
Knowles, Allen N.
Classifying, separating, and assorting solids
Electrostatic
209223A, 198198, B07C 5344
Patent
active
039359476
ABSTRACT:
A magnetic separator includes a continuous belt revolving in a closed path in association with a supply conveyor carrying magnetic and non-magnetic refuse. A magnetic assembly at the belt includes, in the direction of belt travel, a pick-up magnet, a transfer magnet, and a discharge magnet. A curve is provided in the path of belt travel, other than at its head or end pulley, and the magnetic field is generated upstream and downstream of the belt curve and at the curve. The field from the pick-up magnet extends along the belt to the belt curve, the field from the transfer magnet is at the curve, and the discharge magnet is on the opposite side of the curve spaced from the transfer magnet to provide a gap in the magnetic field between the transfer and discharge magnet. Magnetic material from the burden on the supply conveyor is attracted to the belt and non-magnetic material falls away. The magnetic material so attracted travels with the belt into the gap in the magnetic field at which point it is released and falls away from the belt. The released magnetic material follows a trajectory which carries it into the field of the discharge magnet where it is again attracted to the belt. This release and re-attraction movement tends to dislodge any non-magnetic material initially drawn to the belt with the magnetics. In the area of the discharge magnet the magnetic material is moved completely out of the magnetic field whereupon it falls away from the belt for collection. The discharge magnet is adjustable relative to the transfer magnet in the direction of belt travel to vary the length of the gap.
The conveyor belt includes a plurality of cleats projecting from the belt surface and spaced along the belt length. Replaceable wear pads are attached to the belt surface and to the cleat surfaces facing in the direction of belt travel.
REFERENCES:
patent: 905815 (1908-12-01), Grondal
patent: 972109 (1910-10-01), Holmberg
patent: 1146141 (1915-07-01), Dutton
patent: 1590884 (1926-06-01), Bryant
patent: 2303587 (1942-12-01), Snyder
patent: 3809239 (1974-05-01), Barrett et al.
Knowles Allen N.
Wehr Corporation
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