Husking of the rice was carried out using the impeller
husker shown in Fig. 3 with a hard urethane liner, a soft
polystyrene liner and without a liner. The husker had
eight blades of surface length 0)13m, radial length of
of 118m, and a rated impeller speed of 2362 min~1. The
initial radial position r0
is 0.037m and the maximum
radial displacement r1
is 0.155m. Clearance between the
liner and the blades is about 0.015m. The soft liner was
covered with a soft plastic tape for easy identification of
impact marks. Impeller speed was varied between 1400
and 3300 min~1 by an electrical inverter and calibrated
using a digital contact tachometer. The grain properties
determined were moisture content, radius of curvature,
length, width, thickness, and weight. About 50 g of uni-
formly selected rough rice at 15% w.b moisture content
was husked at the rate of 0)027 kg s~1 and the weight of
the husked, unhusked, broken and cracked grain deter-
mined. Cracks in the rice were detected using a grain
scope and a digital power meter was used to measure
husking power. A high-speed camera was used to observe
time and radial displacement of the grain (Delta) on the
lade. Grain motion was simulated by Eqn (13) using a coefficient of friction of 0.5. The equation was solved
using Runge Kutta method (Thomas & Finney, 1988).
Husking of the rice was carried out using the impellerhusker shown in Fig. 3 with a hard urethane liner, a softpolystyrene liner and without a liner. The husker hadeight blades of surface length 0)13m, radial length ofof 118m, and a rated impeller speed of 2362 min~1. Theinitial radial position r0is 0.037m and the maximumradial displacement r1is 0.155m. Clearance between theliner and the blades is about 0.015m. The soft liner wascovered with a soft plastic tape for easy identification ofimpact marks. Impeller speed was varied between 1400and 3300 min~1 by an electrical inverter and calibratedusing a digital contact tachometer. The grain propertiesdetermined were moisture content, radius of curvature,length, width, thickness, and weight. About 50 g of uni-formly selected rough rice at 15% w.b moisture contentwas husked at the rate of 0)027 kg s~1 and the weight ofthe husked, unhusked, broken and cracked grain deter-mined. Cracks in the rice were detected using a grainscope and a digital power meter was used to measurehusking power. A high-speed camera was used to observetime and radial displacement of the grain (Delta) on thelade. Grain motion was simulated by Eqn (13) using a coefficient of friction of 0.5. The equation was solvedusing Runge Kutta method (Thomas & Finney, 1988).
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