Mathematical Model for Design and Development of Double Drum Rotary Screen Cleaner-cum-grader for Cumin Seed

摘要

The cleaner-cum-grader designed and developed was found suitable for cleaning the cumin seed from fine impurities and other foreign matter. For getting higher cleaning efficiency and therefore, more pure grades, the machine should be operated at slow speed and at low inclination while maintaining a controlled feed rate. At about 11 rpm rotational speed of the screen and with 5 % inclination and 30 kg/ h feed rate, the machine has given higher cleaning efficiency above 82 %. The efficiency above 80 % level could be obtained if the machine was operated at 11 rpm screen speed and 5-7 % slope and 30-50 kg/h feed rate. By adjusting the speed, slope and feed rate appropriately as indicated above, the desired level of cleaning and grading of the cumin seed can be achieved.