Patent GB-710379-A (GB)
Title: A press for the continuous expression of liquids from solids
Inventor: CHAPMAN ANTHONY CHARTERS
IPC: B30B9/12
Filed: 1951-12-20
Abstract: 710,379. Presses for separating liquids from solids. JACKSON & CHURCH CO. Dec. 20, 1951, No. 29895/51. Class 46 The press comprises in combination inner and outer press members defining an extrusion chamber between them, an annular member having an inwardly and upwardly directed wall forming a discharge opening of the press, a ring slidably mounted on the annular member, a choke member supported by the ring and movable toward and away from the discharge end of the press, and pressure-extendable means secured to the annular member and connected with the movable ring, so that movement of the extendable means is effective to move the choke member toward and away from the discharge end of the press. As shown the press comprises a frusto-conical hollow perforated screw member 40 having spaced spiral flights 63 rotating within a perforated cylindrical member 22, Fig. 1, the lower end 25 of which is outwardly flared and covers openings 20 in the upwardly and inwardly inclined wall 19 of an annular casting 18, Fig. 4. The casting 18 is secured by brackets 17 to frame bars 16 depending from a plate 13 supported on beams (not shown). A receptacle 32 divided by an annular wall 33<SP>1</SP> into an outer solid-receiving chamber and an inner liquid-receiving chamber is secured to the annular casting 18 by rods 28 passing through lugs projecting from the casting 18, Fig. 4, and receptacle 32 respectively. A choke member 72 comprising three parts namely a sleeve portion 73 slidable on a cylindrical bearing portion 43 of the screw member 40, and two conical portions 75 and 78, is mounted to slide up and down by three arms 82 having bearings 84 sliding on the rods 28. The position of the choke member 72 is controlled by that of a ring 65 sliding on the outside of the casting 18 and connected to the ends of the arms 82 by plates 69, Fig: 4 and Fig. 5. The position of the ring 65 is controlled in turn by hydraulic means including cylinders 90 and piston rods 91, Fig. 5, the cylinders being fed with pressure fluid from a ring conduit 116 by a pump 95, Figs. 1 and 3, through a conduit 115. The choke 72 is raised to a predetermined position against the action of gravity by opening an outlet 105 of a manually-operated valve 103, Fig. 3, whereupon pressure fluid pumped from a reservoir 98 along conduit 102 passes along conduit 111 through three-way valve 113 and along conduit 115. The valve 113 is then adjusted so that all its ports are closed and the valve 103 adjusted so that pressure fluid circulates through outlet 106 and conduit 107 back to the pump 95. To lower the choke 72 the valve 113 is adjusted to permit pressure fluid to flow from conduit 115 through an outlet 118 and along conduits 117 and 108, through pump 95, and along conduit 110 to the reservoir 98. Solid material issuing from the press between the screen 25 on the casting 18 and the screen 76 of the choke 72 falls into the outer annular chamber of the receptacle 32 whence it is scraped, by blades 122 on arms 121 attached to a part 41 of the screw member 40, to an outlet (not shown) controlled by a sliding gate 123, Fig. 4. Liquid from the interior of the screw member 40 passes down hollow portions 41, 42, Fig. 4, of the member and through a central opening 44 in the bottom of the receptacle 42 to a discharge pipe 126. Liquid passing through the screens 76, each covering one of a series of circumferentially-spaced openings in the conical portion 75 of the choke 72, is deflected by the wall 78 and deflectors 125, 128 so as to fall into the inner annular chamber of the receptacle 32 whence it passes to the pipe 126. Liquid passing through the perforated outer member 22 is deflected by a radial flange 130 into the trough formed in the casting 18, which also receives liquid passing through the lower end 25 of the member 22 and openings 20 in the wall 19. Liquid from this trough flows through conduits 37, 36, 35, Fig. 1, to the pipe 126. The upper end of the outer member 22 is imperforate and shaped to form a feed hopper 24. The screw member 40 is rotated by pulleys 59 acting through shaft 58, pinions 60, 61, shaft 51 mounted in bearings 50 and bevel gears 54, 53. Resistors 64 anchored on one or more of the frame bars 16 may be provided.