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coconut machine
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ABSTRACTCoconut dehusker is a machine that uses electric power for coconut dehusking. The main components of this machine are 1HP motor, belt, pulley, gears, shaft with blades, bearings etc. The expected number of coconuts to be dehusked by this machine is about 900 per hour. This machine can result in a great revolution in agro based industries .
PERSONAL VISITSVillage officer: Mr. Suresh Babu
Purpose : To have a discussion on the problems related to automatic coconut dehusking and currently available technologies in it.
Agricultural engineer : Mr. Jayakrishnan
Purpose: • To get a technical guidance related to
coconut dehusker. • The power requirement, speed ratio etc
were discussed in detail.
VISITKelappaji college of agricultural engineering, Thavannur.PURPOSE: To have a knowledge about the already existing machineries used for coconut dehusking.
PERSONS MET: Dr Shivsubramaniam (Dean)
Dr Jayan (Assistant dean)
BENEFITS:Understood that dehusking of coconuts is one of the major problems faced in agro based industries.Understood the basic working principles of dehusking machines .Problems identified.
BEARING DESIGN:
F=10Kgf
S=1.2(service factor)
Equivalent Load(P)=F×S
= 10×1.2= 12Kgf
Dynamic capacity(C)=(L) ×P^(1/K),
(K=3 for ball bearings.)
Life of bearing(L)= (200×60×8×365×5)/10^6
= 175.2 million revolutions
C= 175.20×(12)^(1/3)= 401.1 Kgf
Bearing selection: Self aligning ball bearing
SPECIFICATIONS:SKF NO:2206,d=30mm, D=62mm, static capacity()=560Kgf, dynamic capacity(C)=1200kgf, maximum permissible speed=13000 rpm.
PULLEY AND V-BELT DESIGN:
d=75mm,N=200rpm
D=i*d= 3.6*75= 270mm
equivalent pitch diameter (De)=85.5mm
Belt cross-section symbol is A
Belt speed (s)=( ЛDN)/60= 2.356 m/s
Rated power for belt cross-section A=1.559 KW
Design power=
=(1.559×1.1×1.02)/(.97)
=1.803 KW
No of belts= design power/ rated power
=1.15
1
Centre distance(C)=700mm
Length of belt=2C+л/2(D+d)+((D-d)^2)/4C
=1872mm
Top Width of belt= 13mm
Thickness= 8mm
DIMENSION OF V-GROOVED PULLEY:
Groove cross-section=A
Pitch width=11mm
Minimum depth below pitch line=8.7mm
Slope design
Coefficent of friction for coconut= 0.522
For coconut to slide=
Selected value of slope=28.072
MANUFACTURING DETAILS
Items purchased: Blade:30mm×10mm flat, length 4000mm. Pipe:3 inch diameter-bush pipe, length 1000mm. Shafts:35mm diameter, length 850mm and 650mm. Dummy piece:2 inch diameter, thickness 50 mm. Angle:1/4 inch×5/4 inch-length 4000mm. Bearing: UCP 206.
COST ESTIMATION
MATERIAL COST:RS 2000/- BEARING COST:RS 1250/- MOTOR COST:RS 2000/- BELT AND PULLEY:RS 2500/- GEARS:RS 1500/- MANUFACTURING COSTS:RS 7500/- OTHER COSTS:RS 1250/- TOTAL COST ESTIMATE:RS 18000/-