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The lotus seeds sizing machine was designed and fabricated to study and test factors affecting the grading of lotus seeds. The machine consists of a main frame, a hopper, a seeds sizing unit, a power transmission unit, and a 1 hp electric motor which was used as a prime mover. In the operation, the lotus seeds were fed manually into feeding chute on the top of the machine, then the seeds fell through the seed sizing unit which composed of 3 cylindrical sieves that served for grading into 3 sizes. After that, seeds were released through outlet chute at the front of the machine. The prototype was tested for 3 different sizes of feeding, and at the seeds sizing unit speed of 20, 25 and 30 rpm, respectively. It indicated that the optimal performance was achieved when the machine was operated at seeds sizing unit rotational speed of 25 rpm (Linear speed of the screen for grading is 0.67 m/s), using large size of feeding (15×10 cm2) with feeding rate of 330 kg/hour. The working capacity was 128.2 kg/hour and the percentage of grading was found to be 92.1% with no percentage of damaged seeds. It consumed 0.33 kW-hour of energy.
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