Classifying – separating – and assorting solids – Plural – diverse separating operations – Including sorting of special items or sorting by methods or...
Patent
1986-04-11
1988-05-10
Cherry, Johnny D.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Including sorting of special items or sorting by methods or...
2091392, 209145, 209148, 209631, 209642, B07B 1311, B07B 702
Patent
active
047429194
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a separator, and is more particularly concerned with a rotating separator for separating fines from pin chips in pulp mills.
It is important in pulp mills to separate the fines from the pin chips, the fines usually being incinerated in that they do not have the required long fibers for papermaking.
Fine rotary screens, electrical dynamic separators, vibrating screens and the like, conventional today, are expensive or have a low efficiency.
The object of the present invention, therefore, is to provide a rotary separator which is cost-effective, efficient and controllable with respect to its separating capability.
The above object is achieved, according to the present invention, through the utilization of centrifugal force, together with an air stream, to separate the fines from the pin chips, to maintain the separation and to convey the fines for disposal. A mixture of fines and pin chips is fed by way of an inlet chute onto the center of a horizontal rotating disk which spreads and hurls the material beyond the periphery of the disk. Inasmuch as it has been shown that fine powder does not travel along a ballistic curve in air as well as a heavier particle, the pin chips travel outwardly along more defined ballistic curves while the fines travel lesser paths. Two concentric chambers are therefore formed below and beyond the periphery of the rotating disk, the outer chamber receiving the pin chips and the inner chamber receiving the fines. The outer chamber includes a discharge opening at the bottom thereof for discharging the pin chips onto a conveyor and for providing an air inlet for providing an air stream to communicate with the aforementioned air stream. The inner chamber, however, is a low pressure zone in communication with the air streams so that the fines received therein are entrained in the first-mentioned air stream and conveyed away for disposal.
In a first embodiment of the invention, the rotor comprises a rotating disk having a smooth upper surface for imparting centrifugal forces to the material. In a second embodiment, a plurality of arcuate vanes are provided on the upper surface for directing the material toward the periphery of the disk. In a third embodiment, the rotating disk comprises a plurality of grooves extending toward and opening at the periphery of the disk. In a fourth embodiment, the rotating disk comprises a plurality of spokes or vanes on its underside and a plurality of slots extending through the disk providing classification of the pin chips and fines, the fines falling through the slots into the inner chamber.
The rotating separator of the present invention is provided with a plurality of controls for modulating the centrifugal force, for modulating the dropping point of the material and for modulating the air stream which entrains the fines. The centrifugal force is modulated by controlling the speed of rotation which may be accomplished, for example, through the use of a variable speed drive. The dropping point may be modulated by adjusting the vertical height of the rotor. The air stream may be modulated, very simply, by the use of a variable damper.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic representation of a separating system comprising a separator, shown in section, a fan and a cyclone;
FIG. 2 is a fragmentary top plan view of a rotor which may be used in the apparatus of FIG. 1;
FIG. 3 is a fragmentary sectional view of a separator illustrating a third embodiment of a rotor constructed in accordance with the invention;
FIG. 4 is a fragmentary top plan view of the rotor of FIG. 3;
FIG. 5 is a fragmentary end view of the rotor of FIGS. 3 and 4;
FIG. 6 is a fragmentary sectional view of a separator employing another embodiment of the rotor constructed in accordance with the present invention;
FIG. 7 is a fragmentary top plan view of the rotor illustrated in FIG. 6; and
FIG. 8 is a sectional view taken substantially along the line VIII--VIII of FIG. 7.
Referring to FIGS. 1 and 2, the separating system is
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Beloit Corporation
Campbell Raymond W.
Cherry Johnny D.
Veneman Dirk J.
Wacyra Edward M.
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