ABSTRACT
Groundnut shelling machine was designed and fabricated at the department of Mechanical Engineering, institute of Technology, Kwara State Polytechnic Ilorin aimed at increasing shelling/decorticating efficiency and eliminating drudgery associated with the traditional method of -shelling groundnut and other developed method such as pedal operated methods. The machine is powered by a 1.5 horse power motor at a speed of 1440 revolution per minute. Performance investigation carried out show a good performance of the machine with decorticating efficiency, undecorticating efficiency, machine damage efficiency, cleaning efficiency and output capacity of 92%, 7.5°k, 3%, 85% and 120kg/hour respectively.
TABLE OF CONTENT
Title page i
Approval Page ii
Dedication iii
Acknowledgement iv
Abstract v
Table of content vi
List of Figures vii
Nomenclature viii
CHAPTER ONE
1.1 Introduction 1
1.2 Aim and Objectives of the Project 3
1.3 Justification of the Project 3
1.4 Working Principle 5 CHAPTER TWO
2.0 Literature Review 6
2.1 Methodology 7
CHAPTER THREE
3.1 Selection of materials Used 8
3.2 Beater Assembly 13
3.3 The Sieve 14
CHAPTER FOUR
4.0 Design Analysis 15
4.1 First Stage Design Consideration in New Machine 15
4.2 What is design 15
4.3 Why do we Design 18
CHAPTER FIVE
5.0 Design Calculator 20
5.1 Decorticating Unit Housing 20
5.2 Fan Blades 20
5.3 Pulleys 20
5.4 Design Calculations 20
5.5 Speed Ratio Analysis 21
5.6 Moment of inertia 21
5.7 Calculation of torque 22
5.8 Calculation of machine Drive power 2 3
5.9 Tension in the Belt 23
CHAPTER SIX
6.0 Advantage 28
6.1 Disadvantage 28
6.2 Application 28
6.3 Maintenance 28
6.4 Autonomous Maintenance Activity 29
6.5 Cleaning 29
6.6 Cleaning is Inspection 30
6.7 Cleaning Process 30
6.8 Visual AIDS to Maintain Correct Equipment Condition 30
6.9 Adjust and Minor Repair 31
6.9.1 Adjust and Minor Sequences 31
6.9.2 The Path to perfect Safety 32
6.9.3 Chronic Defects 32
6.9.4 Equipment Improvement 32
6.9.5 Equipment Responsibilities of Operator 33
6.9.6 Precautions and safety measures 33
6.9.7 Precaution 34
6.9.8 Safety Measures 34
6.9.9 Recommendation for school 34
6.9.10 Conclusion 34
Reference 36
LIST OF FIGURE
Fig . 1 Isometric view of Groundnut shelling machine
Fig 2 Side view of Groundnut shelling machine
Fig 3 Orthographic of Groundnut shelling machine
Fig 4 Front view of Groundnut shelling machine
Fig 5 Groundnut shelling machine
NOMENCLATURES
Quantity Symbol Unit
Power of Electric Motor P watts
Rotational speed of driver shaft Nr rpm
Rotational speed of driver shaft Nn rpm
Torsional moment Mt Nm
Bending moment on shaft Mb Nm
Combined shock and fatigue
Factor applied to bending moment Kb –
Combined shock and fatigue factor
Applied to torsional moment Ki
Diameter of shaft Ds mm
Allowable stress Ss N/mm2
Speed of driven pulley Sn rad/sec
Speed of driver pulley Sr rad/sec
Length of shaft Ls mm
Weight of beater assembly Wb N
CHAPTER ONE
1.1 INTRODUCTION
Groundnut is grown mainly in the Northern parts and middle belt of Nigeria. Today we see photographs of pyramids of groundnut taken during the colonial era which has since then disappeared. Some schools of thought attributed this to quite a number of local industries now utilizing them which before were stored as pyramid waiting for export. The Government of Nigeria through its Agricultural programme has seen the need to explore to grow crops including groundnut for many reasons including:
i. Meeting local consumption needs
ii. Stop importation and conserve fund for other uses:
iii. Meeting local industrial uses
iv. Earn foreign exchange through export
v. Create huge employment of the citizen
Groundnut of botanical name Arachis hypogea belongs to the family leguminous. It is a herbaceous plant of which there are two major varieties, bunch and runner. Bunch varieties, common in the United States, grow 30-46cm high and do not spread. Runner varieties, the most common in West African, are shorter and spreads along the ground for 30-60cm. it is grown as an annual crop on about 19 million hectares in tropical regions and warmer areas of temperature regions of the world, principally for its edible oil and protein rich kernel or seeds, borne in pods, which develops and mature below the soil surface. (Asiodu, 1989)
Large cultivation of any agricultural product will also be faced with post harvest challenges. Generally, post harvest handling involves some transforming of the harvested products into materials stored and preserved for further processing. In the case of groundnut that is harvested as pods, it is dried and then processed by shelling/decorticating it to kernels for all users.
Traditional methods of shelling groundnut are done using hand with finger tips or using mortar and pestle. Whichever method is used, it is associated with drudgery, pains at the joints and blistering of fingers. The quality of kernels is mainly determined by the percentage of whole undamaged kernel.
The factor among others has mad the decortications of groundnut an important process that must be developed to enhance value addition and also remove human efforts and also remove human efforts and associated difficulties when using traditional method of shelling such as losses labour intensity, time consuming and low output capacity.
1.2 AIM AND OBJECTIVES OF THE PROJECT
In our country due to heavy cultivation of groundnut there is a need of shelling the ground nuts and obtaining the peanuts in safe, fast and economic form. The agricultural industries in our country heavy machines to do the same but the farmers in rural areas and in small industries its necessary to have a economical and high efficiency machine which can easy bark the groundnut shell, to get this done many machines are use some are universal nutsheler, rubbertyersheller etc.
Hence we, the group of our class found the need of designing and manufacturing such a system will make the peanuts easily come out from its shell and the peanuts too not get broken while the shelling is taking place.
