Design, Fabrication and Performance Evaluation of a Hammer Cum Burr Mill

Obolo A.A.¹ , Ale M.O.² , Kareem K.M.³

1. Department of Agricultural & Bio-Environmental Engineering Technology, Nigeria.
2. Department of Agricultural & Bio-Environmental Engineering Technology, Nigeria.
3. Department of Agricultural & Bio-Environmental Engineering Technology, Nigeria.

Section:Research Paper, Product Type: Journal-Paper
Vol.9 , Issue.8 , pp.1-5, Aug-2023

Online published on Aug 31, 2023

Copyright © Obolo A.A., Ale M.O., Kareem K.M. . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
A hammer cum burr mill developed, and its performance was evaluated using yam and cassava flakes. The machine consists of a hopper, hammer mill unit, a conveyor, attrition mill unit, the frame and 2 horsepower prime mover. To evaluate the performance of the machine, two experiments were conducted. In the first experiment, varying speeds of 750, 1270 and 1800 rpm at a constant machine load of 0.5 kg were used. In the second experiment, varying machine loads of 0.5, 1.0, 1.5 and 2.0 kg at a constant speed of 1270 rpm. The moisture content of yam and cassava flakes were kept constant at 12.5% dry basis. The results of the research showed a polynomial relationship between speed and milling efficiency in the cassava experiment as well as the capacity in both the yam and cassava experiments. While a linear relationship was observed between speed and milling efficiency in the yam experiment and same observation was made between the machine load and milling efficiency as well as machine capacity in both the yam and cassava experiments. The optimum milling efficiencies of 93 and 85% were recorded at respective speeds of 1270 and 750 rpm for cassava and yam. The optimum efficiencies were achieved at a machine load of 0.5 kg. The hammer cum burr mill was tested and found suitable for milling of cassava and yam flakes into flour (“elubo”). It can also be used for plantain flour and other related food materials. Therefore, it is recommended for the use of farmers and agricultural processors.

Key-Words / Index Term :
Cassava, design, fabrication, flour, performance indices, size reduction

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