GB1375497A - - Google Patents

Abstract

1375497 Screw extrusion presses FRENCH OIL MACHINERY CO 6 July 1972 [9 July 1971] 31611/72 Heading BID In a screw press, suitable for expressing moisture from sugar cane bagasse, comprising a cylindrical cage 10 through which extends a shaft on which are mounted a series of worms, only the last two worms 29, 30 at the discharge end of the press being shown in Fig. 1, the worms are separated by annular collars 36 and at least the last worm 30 has two or more helical flights uniformly disposed around the circumference of the body of the worm and passing through a common radial reference plane, each of the flights extending circumferentially for not more than 200‹. In the embodiment shown the last worm 30, which tapers outwardly towards the end of the press, has two flights 44 passing through a plane 45 (Fig. 3) perpendicular to the axis and extending over 170‹ of the circumference of the body 42 of the worm so that there is a 10‹ gap 46 between adjacent ends of the flights (Fig. 4). The cage comprises two semicylindrical sections 12 each having ribs on which are mounted bars 16 spaced to define longitudinally-extending slots through which liquid is expressed. Breaker bars 38 project inwardly into the cage between the worms. The residual pulp is forced out of the press through an orifice 75 between frusto-conical rings 60 and 70, and liquid is expressed through holes 76 in the latter, which is carried by a guide member 78 mounted on the non-rotatable piston rod 84 of a hydraulic cylinder 82 by which the size of the orifice 75 can be adjusted. The ring 70 may be withdrawn by the hydraulic cylinder and removed, and the cylinder may then be used, together with pullrods passed through holes in the member 78, to withdraw, in turn, collars 54 and the worms 30, 29 &c. and intermediate collars 36. The cylinder may also be used in the re-assembly of these parts.