THE EFFECT OF SCREWANGEL AND COMMODITIES TO PERFORMANCE OF SCREWCONVEYOR ON TWO VARIATIONS ANGULAR SPEED

Abstract

The aims of this research were to make and test the material transportation device of grains dan legumes
(corn, soybean, and green beans) screw type (screw conveyor), to find the effect of screw angle (±) and
commodities to performance of screw conveyor, and to find out the best screw angle (±) and commodity to
performance of screw conveyor for each angular speed those are 40 and 54 rpm. This research has been
conducted on December 2014 until February 2015. This research was conducted in two phases, those are
creating device which conducted in CV WIDODO, Kuripan village, West Teluk Betung sub-distric, Bandar
Lampung and testing was conducted at the Laboratory of Power and Agricultural Machinery, Agricultural
Engineering Department, Faculty of Agriculture, University of Lampung. This research was conducted in
three different screw angles, those are 30°, 45°, dan 60°. Later, these three different screw angles is subjected
to three repetitions and in two different angular speed (rpm), those are 40 rpmand 54 rpm. The results show
that the best working capacity of screw conveyor on the variation of screw angle and commodities for each
angular speed for 40 rpm on soybean and 30° screw angle is about 178,6 g/s, while for 54 rpm on green
beans and 30° screw angle is about 238 g/s. It can be indicate that speed rotation (rpm) and screw angel
affect significantly on screw conveyor;s working capacity.
Keywords : Screw conveyor, screw angel, grains and legumes