PENGGILING GABAH
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Data Gabah dan Beras
Gabah : Massa jenis : 600 kg/m3
Tebal : 2mm Volume : 16.22 mm3
Beras : Massa jenis : 700 kg/m3
Tebal : 1,5 mm Volume : 12-13 mm3
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Perhitungan Debit Beras
c8 in
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1. Diagram GayaPerhitungan Daya
N N
W
f f
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R
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2. Menghitung Gaya Normal yang dialami Gabah
NewtonMPam
N
mmmMPa
llAEF
llAF
E
16
1002.0
105.0103220 26
326
0
0
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3. Gaya Gesek yang Terjadi untuk Satu Butir Gabah
4. Gaya Gesek yang Terjadi untuk 101 Butir Gabah
Nf
f
Nf
g
g
g
88,10
1668,0
Nf
Nf
g
g
1099
88,10101
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NmTmNT
rFT
70,161052.11099 2
5. Torsi pada Penggiling
6. Daya yang diperlukan
HPPKiloWattP
NmrpmP
TnP
46.034.0
70,16600001922
600002
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Hopper
10 inch
4 inch
6 inch 8 inch
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Perhitungan Output Beras dan Kulit Gabah
Perhitungan Debit Kulit Gabah ρgabah = 600kg/m3
ρ beras = 700kg/m3
Vgabah = 16,2 mm3 Vberas = 12,5 mm3
smQ
Q
VV
beras
beras
beras
gabah
beras
gabah
329.1
5.1222.1667.1
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jamkgm
m
mQQ
mmm
kulit
kulit
kulitberasberasgabahgabah
kulitberasgabah
395
67.170029.1600
jammQ
mQ
jamkg
kulit
kulit
kulit
395.3
100
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Spesifikasi Blower
GF-750Power: 750 wattPressure: 0.190 MpaOutput: 63000 liter/ jamWeight: 18.0 kgDimension: 230x295x260 mm
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Perhitungan Gaya Hisap Blower
Luas Penghisap Panjang = 8 inch = 203.2 mm Lebaar = 2 inch = 50.8mm
Laju Aliran Massa Udara
Kecepatan Aliran
242
24 1012910532,20 mcm
mcmcmlpA
sec21.0
secmin
501
10001
min10502.13
3
kgliter
mliterm
kg
xQudaram
sm
AQV 35.1
101290175.0
4
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Gaya hisap blower pada Kulit Gabah
Gaya hisap blower pada beras
Nsm
skgvmF udara 0284.035.1021.0
Fh
W
53° N
WFF hy
003.08.9002.08.00284.0
53sin
N
WFF hy
075.08.901.08.00284.0
53sin
Karena resultan gaya negatif pada beras, maka beras tidak terhisap
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Menghitung Kecepatan Putaran Blower Mencari Gaya Tangensial P=FxV Ft=P/V =750/1.35=555N
Mencari Torsi yang terjadi T= FxR= 555x0.15 = 83.25Nm W=P/T= 3700/83.25 = 44rad/s
= 424rpm
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Ptotal = Proller + Pblower = 0.46 HP + 1.005 HP = 1.465 HP
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Spesifikasi Motor
Sehingga, saya memilih untuk menggunakan motor dengan spesifikasi :
Kecepatan Putar = 1000 rpm Daya = 2 HP