interim project presentation on coconut dehusker

17
INTERIM PROJECT PRESENTATION ON COCONUT DEHUSKER .

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coconut machine

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INTERIM PROJECT PRESENTATION

ON COCONUT DEHUSKER

.

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.

DESIGNForce calculation:

Force calculated using UTM

Result: dehusking force = 8 Kgf ( tender coconut)

= 10 Kgf(dry coconut)

CALCULATION

Power requirement

=

=205.46 W

=0.27 hp

Hence , 1 hp slow speed motor is selected

Shaft design

=

The diameter of shaft selected is 7 cm

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/-

WORK COMPLETED

THANK YOU