Abstract
We have studied on the elevating efficiency by the thrower for the unhulled rice, and obtained the following results.
(1) According to the form of the wing used in the present experiment, the elevating efficiency increase according to the increase of the recede angle in the range of (0°-50°), and it reaches at the limit efficiency under the conditions of (5.5-7.0m/s) of its circular velocity.
(2) Number of wings is satisfied by only 2 sheets, in the case that its width is (30-40mm), and obtained the better results according to the increase of the volume of supply in the range of (333-1, 410kg/hr).
(3) Elevating efficiency is much influenced by the gap between the margin of wing and the casing; and it is proper that the breadth of the gap shows about 3mm.
(4) There is no distinct influenc in the case of the gap between the side margin of the wing comparing with the gap between the ending margin and the casing, but it seems proper that the gap is about (3-5mm).
(5) Larger the diameter of rotation of the wing better the elevating efficiency to the expected height even in the condition of the same circular velocity.
