A Kinematographic Study on the Feeding-out Function of Paddy with Feed-Rolls of Rice Huller

Abstract

Author studied on the functions of six feed rolls (A)-(F) of the rice holler in fig. 1, by means of high-speed kinematography taking about 1600 photographs per second in max. H and L in the table and figures mean high and low revolution of rolls respectively.
Fig. 1 shows the relation between peripheral velocities of rolls and flowing-down velocities of paddy. In fig. 3 are expressed the distribution-per centages of paddy-mass flowing at 4 sections of 2I/2″ width and in fig. 4 the fluctuations of their discharge. From the percentages in the table it can be seen to flow down any directions of paddy.
Generally speaking, the functions of rag rolls (A), (B), (C) are on the whole satisfactory, but the roll with non-many rag supported at two sides is assumed to be better. (D) roll is not adapted for a feed roll paddy in rice-huller, because it is difficult to give the equality of feeding out mass and the direction of longitudinal axis of paddy. Roll with deep flute is fitted to the external force feed of seeds.