JPS6456154A - Friction-cutting rice sweeper of longitudinal axis type - Google Patents

Abstract

PURPOSE: To obtain an adequate pressure distribution in a grain milling chamber and to prevent the occurrence of uneven polishing and broken kernels by setting the distances from the peripheral surface of a drum and the center of rotation with respect to the rotating direction of plural agitating flights smaller toward a front side and disposing plural rows of air jet ports in the circumferential direction of the peripheral surface of the drum. CONSTITUTION: The rice grains supplied from a rice grain supply section to a spiral rotor are fed upward by this spiral rotor and is polished in the grain milling chamber 6 having its main section at the spacing between the perforated wall bran removing and grain milling cylinder 2 and a grain milling rotor 5. The polished grains are discharged from a rice grain discharge section. At this time, the distances from the respective front and rear peripheral surfaces of the drum and the center of rotation with respect to the rotating direction of the respective agitating flights 34 are formed smaller on the front side of the rotating direction than on the rear side thereof, by which the pressure distribution state of the rice grain in the grain milling chamber 6 is made uniform and the rice grains are perfectly polished. The adhered bran is well removed without increasing the quantity of the jet air by the bran removing air from plural rows of the air jet ports 31 disposed in the circumferential direction of the peripheral surface of the drum.