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Production Of Clean Grain From Multi Crop Thresher For Small Scale Farmers
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2.5.2.4 NCAM multi crop thresher
The National Center for Agricultural mechanization producesthis machine which consists of an upper, the threshing unit, blower and frame. The threshing speed is from 850-1300rpm depending on the crop and concave clearance. The overall dimension is 90×70×14cm3. The power source is either petrol or electricity. (Adewuyi, 2009).
2.6 Reviews on Existing Work on Threshing Machines
Many researchers have worked on threshing machine some of which are:
Ahanoku and Ogunjiri(2004) reported on the design and construction of multi-crop thresher the result of the thresher with multi-crop potential of relatively low labor requirement portable and lost effective was designed and fabricated. The application of auto CAD 200 software of the design resulted in design accuracy, the reduction in design and construction as well as prevent material wastage the thresher has an overall dimension of 900x700x1302mm.Perforamce evaluation test were carried out using maize and sorghum in one pass. No mechanical damage of the threshed crops was observed during the testing.
Abdulsalam and Muhammed (2011) reported on the performance evaluation of a shaker mechanism of an axial flow maize thresher. A case study of before and after modification the performance of two shaker were significantly different at 5% level of significant difference, event at1% the mean performance obtained based on variable feed rate at a constant speed for the shaker before modification were 78.59% mean clearing efficiency and 9.25% mean scatter loss, while of the modification shaker were 91.48% mean clearing efficiency and 3.68% scatter loss.
Oseni(2010) designed constructed and evaluate the performance of a manually operated cowpea thresher for small scale farmers in Nigeria. In northern Nigeria results obtained gave a threshing effectiveness of 85.9, 84.6 and 84.15% for kanannado, Borno brown, and Aloka local respectively. Seed damage was 1.8, 2.3 and 1.9% for kanannado,Borno Brown and Aloka local respectively.
Salakhe (2008) fabricated a threshing unit to study the effect of machine crop variables on the performance of an axial flow thresher for threshing soyabeans.Test result indicated that the threshing efficiency varied from 98 to100%.The grain loss were less than 1 and 1.5% respectively at drum speeds of 600 to 700.PM and 540 to 720kg (plant) feed rates and 14.34 to 22,77%(w/b) seed moisture contents.
Adewumi (2011) designed and fabricated a medium scale, thresher cleaner with conveyer, thresher, fan and cleaning units for grains and legumes. The machine which was subjected to preliminary test using cowpea(Ife Bimpe variety) with a pod moisture content of 14.0 to 22.0% gave threshing efficiency in range of 67.5-97.7% for the same moisture content values.
ullenyawa (2012) reported and investors by Mr. M.T Ismahoon, a star product called Mahawhi Agro multi-thresher a highly versatile machine which thresh, winnow and cleans grain in one operation. The machine can be used for variety of crops and such as green-grain, black-grain, cowpea and soya beans. It can also thresh corn by changing the drum. Despite these effect rural and poor farmer in Nigeria continue to face challenges in accessing thresher, because of production lost of the machine or because the machine are not locally available. Adewumi et.al; (2012).
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ABSRACT - [ Total Page(s): 1 ]ABSTRACTThe traditional methods of threshing of crops are inefficient, laborious, and time consuming and low out put. The existing fabricated machine was observed during preliminary testing to have low performance. In the light of the above mentioned problems, there is need to modify and testing multi-crop thresher to threshed grain at optimum speed. The threshing machine consist of the following component: Hopper, frame, beater, sieve, pulley, grain outlet and chaff outlet. The factors consider ... Continue reading---
TABLE OF CONTENTS - [ Total Page(s): 1 ]TABLE OF CONTENTS Title page Certification Dedication Acknowledgement Abstract Table of contents List of figures List of plates List of tables’ CHAPTER ONE: INTRODUCTION 1.1 Background of the study 1.2 Problem statement 1.3 Aims and objectives 1.4 Justification 1.5 Scope of the project CHAPTER TWO: LITERATURE REVIEW 2.1 Threshing Process ... Continue reading---
CHAPTER ONE - [ Total Page(s): 2 ]CHAPTER ONE INTRODUCTION1.1 Background of the StudyCowpea is a grain legumes appears to have originated from west-African, very widely in Nigeria were there are many wild weedy species in both savanna and forest zone (Steel, 1992).Cowpeas are now widely distributed throughout the tropics and sub-tropics. They are grown in India, south eastern Asia, and Australia the Caribbean, southern united state and throughout the low land tropical Africa. Nigeria alone ... Continue reading---
CHAPTER THREE - [ Total Page(s): 7 ]Torgue = F × rWhere, F = Centrifugal force =2666N R = radius of machine pulley 0.155 Torgue = F × r = 2666 × 0.155 = 413NmPower = Where,N = speed of the electric motor = 1430rpm = 3.142T = 413NmP = 2 × 3.142 × P = 61854.5KW3.4.3 Design for Shaft of the machine A shaft is a rotation machine element which is used to transmit power from one place to another. The power is delivered to the shaft by force and the resultant torgue ( ... Continue reading---
CHAPTER FOUR - [ Total Page(s): 1 ]CHAPTER FOURRESULT AND DISCUSSION4.1 ResultThe experimental result obtained from the experiment is as shown in table 5.1 and 5.2 the raw data is as shown in appendix.4.2 DiscussionsA multi-crop threshing machine was modified and evaluated for performance. The threshing efficiency, unthreshed efficiency, breakage efficiency and throughput capacity were 90.1%, 9.5%, 20.1%, 143.4kg|hr for feed rate of 2kg and 90.9%, 9.1%, 14.11% and 251kg|hr for feed rate of 3kg respectively at a consta ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVECONCLUSION AND RECOMMENDATION5.1 Conclusion The following conclusion was drawn from the performance carried out on the multi-crop thresher.I. The speed of the blower was obtained which reduces the blown out of grains from the outletII. The feed rate of 3kg favors the constant speed of 300rpmIII. The higher the feed rates at the threshing drum the higher the throughput capacity.5.2 RecommendationBased on the result and conclusion, the foll ... Continue reading---
REFRENCES - [ Total Page(s): 1 ]REFERENCESAbdulkadir.B.H. and Olufemi A.O (2009).The design and construction of threshing machine.Assumption university journal of technology 12(3) pp199-206.Adaokoma (2001) Design and fabrication of multi-purpose grain dehauler.Eng Thesis, Department of mechanical engineering federal university technology (FUT) minna Nigeria.Adewumi (2006).Design, fabrication and preliminary testing of a thresher cleaner for grain legume, food science technology.Bates.W.N. (1999).Mechanization of tropical crops ... Continue reading---
