GB942400A - - Google Patents

Abstract

942,400. Mixing appliances. TIEFUND OBERBAU G.m.b.H. May 4. 1960 [May 4, 1959], No. 15769/60. Heading B1C. A mixer for making colloidal suspensions of water, lime &c. with sand comprises a container having an upper cylindrical part 1a and a lower frusto-conical part 1b, and a stirrer comprising substantially a whirling disc 3 rotated by a vertical shaft 4 at a speed of 1400 to 1500 r.p.m. and mounted at an inclination to the horizontal as shown. The container also has rectangular vertical baffles 6 mounted tangentially to the disc in the direction of rotation. Both the baffles and the disc may have cut-out openings 7, 8 respectively. The diameter of the stirrer disc is at least half the diameter of the cylindrical part 1a of the container, and it is mounted in the middle or upper half of the frusto-conical portion 1b so that the distance between the disc and the container bottom is one-third to one-half the diameter of the disc. The height of the baffle 6 is about three times the distance of the stirrer disc from the container bottom. The machine may have discharge valves or may be emptied by tilting. In a modification, Figs. 3 and 4 (not shown), the disc has a plurality of semicircular scooplike deformations facing the direction of flow and bent alternately upwards and downwards. In another modification, Figs. 5 and 6 (not shown), the disc is both inclined and is upwardly concave and has egg-shaped bodies and holes alternately disposed around its axis. Alternative forms of the stirrer disc are a disc with four parabolic portions symmetrically removed round its periphery, the edges of the cutaway portions optionally being bent alternately upwards and downwards (see Fig. 7, not shown); and a disc with radial ribs on one or both sides formed integrally or by fabrication (see Figs. 8 and 9, not shown). The angle of inclination and of the stirrer disc may be from 5 degrees to 10 degrees in the various constructions and the angle of the baffle # from 30 degrees to 40 degrees.