US 4,395,331 AGranted

Apparatus for pressing liquid out of material containing liquid

AssigneeAB Saffle Gjuteri and Mekaniska Verkstad

InventorHarald Andersson

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Abstract

An apparatus for pressing liquid out of suspensions containing liquid, comprising a screw feeder (5) adapted to feed the suspensions towards a dewatering zone (2) in which there are disposed two converging endless filter members (20, 21) adapted to be driven round a pair of back and front breaking rollers (18a, 18b). The pressing angle (.alpha.) between the filter members can be varied as can the speed of the filter members in relation to the material which is fed forwards in order to achieve an optimum flow resistance for each suspension. In certain cases, this can be very high. A worm wheel (13) is provided to prevent material from retreating in the screw thread (11). According to one form of embodiment, two or more dewatering zones are disposed in series one after the other, thus further increasing the possibilities for achieving optimum dewatering conditions.

Claims12

Dependent claims

Apparatus for pressing liquid out of liquid-containing material, said apparatus comprising

(a) dewatering means for dewatering said material, said dewatering means including at least one pair of converging, endless, vertically disposed filter members each including
(i) a back and a front braking roller each roller having a vertical axis,
(ii) a perforated support base,
(iii) a filter supported on said support base,
(iv) drive means for driving said filter at a variable speed around said braking rollers, and
(v) adjustment means for rendering at least one of said filter members variably adjustable to vary the pressing angle between that filter member and the other filter member of the pair,
(b) a horizontally disposed screw feeder means for feeding said material in an axial, horizontal direction towards said dewatering means, and
(c) toothed worm wheel means for preventing material from retreating into the thread of said screw feeder means as a result of high flow resistance in the dewatering means by maintaining at least one tooth of said toothed worm wheel means in sealing engagement with said screw feeder means in the thread thereof.

5 more elements

Dependencies are inferred from the claim text.