Development a prototype for improving the performance of the cleaning unit in combine harvesting machine [electronic resource].

Includes bibliographic reference

Seed cleaning is an important operation in a number of processes connected with the handling of seed after harvest.
The goals of the current research were developing of a laboratory unit for cleaning the wheat crops in combine harvesting
machine. The laboratory model was manufactured to simulate and study the aerodynamic characteristics of air and test the
performance of the developed cleaning unit at four aerodynamic suction velocities 5.9, 8.5, 11.6 and 14.9 m/s., three
feed rates 3, 5, and 7 kg/min, two rotational speed 245 and 350 r.p.m to operate the screens, two shapes for suction part
rectangular and circle and three slope angles for screens 5°, 10° and 15° with three replicates. The results indicated that
the average of minimum specific energy was 8.46 kw.h.ton-1 at 5.9 m/s aerodynamic suction velocity, 5? screen slope,
0.42 ton/h feed-rate, 245 rpm rotational speed and circle shape of suction tube. Also, the maximum cleanliness was 99.41 %
for aerodynamic suction velocity of 14.9 m.s-1, slope of the screen was 15?, at feed-rate of 3 kg.min-1, rotational speed of
245 rpm and rectangular shape of suction tube. On the other hand, the minimum grain losses percent was 0.53% at aerodynamic
suction velocity of 5.9 m.s-1, 5? slope of the screen, 3 kg.min-1feed-rate, 245 rpm rotational speed and circle shape.

Summary in Arabic.