MX172500B - IMPROVEMENTS IN ROTOR FOR GRAIN SHREDDING AND POLISHING MACHINE - Google Patents

Abstract

The present invention refers to improvements to the rotor for a grain shearing and polishing machine, of the type of machine comprising a vertical cylindrical housing; a cylindrical screen unit mounted within said housing, which comprises intermittent screen and abrasive material sections arranged along its entire circumference; a rotatably mounted abrasive rotor concentrically within said screen unit; and an air driver assembly for driving a cold air stream in a radial direction from the center of the rotor through holes in it and to the outside of the screen unit; said rotor comprising a hollow shaft that provides the central air duct and which is sealed at the end opposite to the supply of said air, also having a plurality of radial holes for the passage of air outward, an endless worm mounted on said shaft for driving the grain upward, and an abrasive rotor section mounted on said axis adjacent to the worm, said improvements being characterized in that the abrasive rotor section is constituted by a plurality of impellent discs mounted integrally to said axis and spaced by a plurality alternating of spacer rings of smaller diameter and provided with holes that coincide with the radial holes of the hollow shaft to allow the passage of air out of the rotor, said impeller discs having peripheries that take the form of cams that form one or more radial shoulders abruptly directed in a direction perpendicular to the periphery, so that the p Attack position of said shoulders can be arranged for each individual impeller disc in either of two directions, either to obtain a strong grain drag effect or positive action, or a grain spin effect or negative action, depending on whether the shoulder is located forward or backward, respectively, with respect to the direction of rotation.