Classifying – separating – and assorting solids – Sifting – Elements
Patent
1997-06-06
1999-10-19
Nguyen, Tuan N.
Classifying, separating, and assorting solids
Sifting
Elements
209300, 209385, B07B 152
Patent
active
059673354
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for separating off undesired particles from a suspension stream in accordance with the precharacterizing clause of Patent claim 1.
STATE OF THE ART
It is already known to clean undesired particles, such as knots, stone and tramp material, from pulp suspensions, for example in advance of a pulp press. Many arrangements are provided with rotating screening drums of varying configuration and with fixed cleaning members, such as, for example, the arrangement which is described in SE-B-426 180. This arrangement has a rotating screening drum provided with circular slits and a fixed, comb-like cleaning member, in which arrangement the teeth of the cleaning member fit in the slits. The arrangement is intended primarily for obtaining a sub-stream of finer pulp fibres having passed through the slits of the screening drum, for so-called liner production without undesired particles. The remainder of the suspension stream is conveyed past the screening arrangement. The arrangement functions well for relatively low concentrations (<5% pulp fibres). In the arrangement according to SE-B-426 180, there is a tendency, at higher concentrations, for the slits in the screening drum to clog up relatively quickly after the cleaning member has passed them, and there are difficulties in conveying the undesired particles off in an appropriate manner.
BRIEF DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a screening arrangement which can clean undesired particles from a pulp suspension and in so doing can satisfy stringent requirements both as regards capacity and the possibility of treating the suspension flow at high concentration, and where the undesired particles can be led off from, and collected in a suitable way at, the screening arrangement. This object is achieved by means of an arrangement for separating off undesired particles from a suspension stream in accordance with the characterizing clause of Patent claim 1.
DESCRIPTION OF THE FIGURES IN THE DRAWINGS
The arrangement according to the invention will be described in detail below in connection with a preferred embodiment and with reference to the attached drawings, in which
FIG. 1 shows a side view, in partial cross-section, of the arrangement according to the invention,
FIG. 2 shows a cross-sectional end view taken along the line II--II in FIG. 1,
FIGS. 3 and 4 show detailed views of the screening drum according to a preferred embodiment, and
FIG. 5-7 show detailed views of one of the cleaning combs according to a preferred embodiment.
PREFERRED EMBODIMENT
The arrangement according to a preferred embodiment of the invention which is shown in FIGS. 1 and 2 consists of an essentially cylindrical housing 10 with a centre line C. The housing is provided with an inlet 11 for the suspension which is to be treated, which inlet 11 is placed approximately in the middle of the housing 10, and, along the periphery of the housing at a distance from the inlet, an outlet 12 for the particles which have been removed. The outlet 12 is arranged facing vertically downwards. The inlet and outlet are preferably offset by 90.degree. along the periphery of the housing, but other configurations are also possible.
The housing 10 is provided at each end with flanges 13, 14 which are mounted fixed in a suitable manner. One end 15 of the housing is open and functions as an outlet for the treated suspension. The end 15 is connected with the aid of the flange 13 to a conduit system (not shown) for onward transport of the suspension. The other end of the housing 10 is provided with an end wall plate 16 which is fastened releasably on the flange 14 of the housing, with the aid of screws 17 for example. A bearing member 18 is mounted on the end wall plate 16, and this bearing member 18 is also releasable. A drive shaft 20, which is rotatably mounted in the bearing member 18, extends through the centre of the end wall plate 16 and some distance into the interior of the housing, its axis of ro
REFERENCES:
patent: 4303508 (1981-12-01), Skretting
patent: 5051167 (1991-09-01), Hoglund
patent: 5622267 (1997-04-01), Hautala
Clarstrom Bo
Hoglund Ronny
Fasth Rolf
Kvaerner Pulping AB
Nguyen Tuan N.
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