Design, Fabrication and Performance Evaluation of Groundnut Dehulling and Separating Machine

Year 2021, Volume: 2 Issue: 1, 104 - 123, 30.06.2021

Ademola Adenıgba , Adewale Sedara

Abstract

The process of oil extraction can be enhanced by dehulling, oil produced from groundnut seeds serve as a good source of protein, vitamin, fat, oil, and crude fibers. A groundnut dehulling machine was developed, having two dehulling rollers, rubber beaters, screen, blower unit, seed and chaff outlet. The separator unit has a centrifugal blower, screen and collecting tray. It’s powered by 3 hp electric motor, which transmits constant speed of 3636 rpm to the blower and 1000 rpm to rubber beaters. Groundnut used was at 7.32% moisture content (w.b). Dehulling was achieved through the compression and shearing action of the rotating dehulling roller against the stationary dehulling roller. The effect of dehulling roller clearance (6.5 mm,7.0 mm, 7.35 mm and 7.5 mm) and speed (700 rpm and 750 rpm) was evaluated on dehulling efficiency, machine capacity, mechanical damage and separation efficiency. The result obtained after testing the machine shows that 7.35 mm clearance and 700 rpm of the dehulling roller gave optimum average dehulling efficiency 95.80%, separation efficiency 81.40% and the least mechanical damage 11.01%. Machine capacity of 97.98 kg h-1. was obtained at 750 rpm and 7 mm dehulling roller clearance. The results obtained during evaluation was statistically analyzed, multiple linear model equations which are capable of predicting the effect of dehulling roller clearance and speed on dehulling efficiency, machine capacity, mechanical damage and separation efficiency was developed.

Keywords

groundnut seed, dehulling machine, separator, Design, Electric motor, Impact force, Compression and shearing action

References

• Abubakar M and Abdulkadir BH (2012). Design and evaluation of motorized and manually operated groundnut shelling machine, International Journal of Emerging Trend in Engineering and Development, 2(4): 673-682.
• Food and Agriculture Organization of the United Nations (2013). About the world growth of groundnut. Retrieved from http://www.fao.org/faostat/en//, 4 July 2018.
• Gupta, R. K. and Das, S. K. (1999). Performance of Centrifugal Dehulling System for Sunflower Seeds. Journal of Food Engineering, 42(4): 191-198.
• Hall SA and Holowenko RA (1982). Machine design, Schemes Outline Series, p:112
• Huber JA, O Dogherty, MJ, Dyson J and Marshal CJ (1992). A study of physical and mechanical properties of wheat straw, International Conference on Agricultural Engineering, Upp Sala.
• Joshua HC (1981). Design and selection of threshers parameter and components, Agricultural Mechanization in Asia, Africa, and Latin America, 11(2):61-63.
• Karaj S and Muller J (2010). Determination of physical, mechanical and chemical properties of seeds and kernels of Jatropha curcas L. Industrial Crops and Production, 32(2), 129-138.
• Khurmi RS and Gupta JK (2005). A textbook of machine design. 14th revised Russnogle, J., (2009). World's Largest Planter: John Deere's DB120. Corn and Soybean Digest.
• Khurmi RS and Gupta JK (2007). Machine design, 14th Edition, Eurasian Ltd, RanNagar, New Delhi, p: 1230.
• Maduako JN and Hannan M (2004). Determination of some physical properties of three groundnut varieties, Nigerian Journal of Technology, 24(2): 12-18.
• Maduako JN, Saidu M, Matthias P and Vanke I (2006) Testing of an engine-powered groundnut shelling machine. Journal of Agricultural Engineering and Technology (JAET), 14: 29-37.
• Mazhar K, Bahadır S, Erdal E, Ozturk I and Ozmen TB (2013). Seed size and shape analysis of registered common bean cultivars in Turkey using digital photography, Journal of Agricultural Sciences, 19: 219-234.
• Mohammed K, Afutu E, Odong T, Okello D, Nuwamanya E, Grigon O, Rubaihayo P and Okori P (2018). Assessment of groundnut (Arachis hypogaea L.) genotypes for yield and resistance to late leaf spot and rosette diseases. Journal of Experimental Agriculture International, 21: 1-13.
• Munck L, Back Knudsen KE and Axtell JD (1982). Industrial milling for the 1980s. Proceedings of the International Symposium on Sorghum. International Crops Research Institute for the Semi-Arid Tropics. Patancheru, India.
• Pradhan RC, Said PP and Singh S (2013). Physical properties of bottle gourd seeds, Agric Engineering International: CIGR Journal, 15(1): 106－113.
• Rao VR (1980). Groundnut genetic resources at the International Crops Research Institute for the Semi-Arid Tropics. In: Proceedings of the International workshop on Groundnuts, pp. 65- 71, ICRISAT, India.
• Sanjay K (2010). A numerical approach in agricultural engineering with objective, NET, GATE, and ARS Digest, Kalyani Publishers, New Delhi, 110002, p: 247-256.
• Sedara, AM, Lanwo R and Sedara OS (2020). Development of a Low Cost Two-Row Groundnut Planter. Turkish Journal of Agricultural Engineering Research (TURKAGER), 1(2): 324-338. https://doi.org/10.46592/turkager.2020.v01i02.009 Sharma CS and Kamlesh P (2006). Theory of mechanisms and machines, Prentice hall of India private limited, p: 184-241.
• Thakur VK, Thakur MK and Gupta RK (2013). Rapid synthesis of graft copolymers from natural cellulose fibers. Carbohydrate Polymers, 98: 820-828.