Crane Kolom Putar`d2

aH1

h

qGo. lH1

H1 =Go . a + q . Lo =Tekanan bidang yang diizinkan

hGo =Berat crane kolom putar

v =Gaya vertikal (Kg)q =Beban (Kg)

v =q + GoM =Go . a + q . L

v =x d12 . oa =Jarak titik berat crane ke sumbu putar (m)

4l =Jarak beban ke sumbu putar (m)

d1 =h =Jarak tengah-tengah bantalan

H1 =Lo . d2 . o

Lo=

d2

d2

L0

Mg =H1 . . (d2/2) + H1 . . (d1/2) + v . (d1/4) .

F. L . =H1 . . (d2/2) + H1 . . (d1/2) + v . (d1/4) .

Gaya dorong = F =H1 . . (d2/2) + H1 . . (d1/2) + v . (d1/4) .

L .

Dengan Motor Penggerak71620 . N/n . i . =H1 . . (d2/2) + H1 . . (d1/2) + v . (d1/4) .

N =(H1 . . (d2/2) + H1 . . (d1/2) + v . (d1/4) . ) x n

71620 . i .

1. Contoh soal:Dik :q = 5 Ton (5000 Kg), Go = 800 Kg, a = 0,75 m, L = 2 m, h = 3 m, o = 60 Kg/cm2, b = 600 Kg/cm2, = 0,7, = 0,1, n = 300 rpm, i = 8.

Dit :N ?

Jawab :H1 =Go . a + q . L=800 . 0,75 + 5000 . 2=3533,33 Kg

h3

d1 =

d1 ===11,097 11,11 cm

v =x d12 . o

4

v =0,785 x (11,1)2 x 60=5803,2 Kg

=

=== 1,414

Lo =1,414 . d2

H1 =Lo . d2 . o

3533,33 =1,414 . d2 . d2 . 60

d2 = = 6,45 cm

Maka:

N =(H1 . . (d2/2) + H1 . . (d1/2) + v . (d1/4) . ) x n

71620 . i .

N =(3533,33 . 0,1 . (6,45/2) + 3533,33 . 0,1 . (11,1/2) + 5803,2 . (11,1/4) . 0,1) x 300

71620 . 8 . 0,7

N =4710,7 x 300

401072

=3,524 Hp

2. Sebuah crane, digunakan untuk memindahkan sebuah beban seberat 6 Ton. Berat crane 500 Kg. Jarak titik berat crane ke sumbu putar 1 m. Jarak beban ke sumbu putar 2 m. Jarak tengah-tengah bantalan 4 m. Bila o = 60 Kg/cm2, b = 600 Kg/cm2, = 0,7, = 0,1, n = 300 rpm, i = 8. Tentukan daya putaran motor penggerak yang dibutuhkan?Penyelesaian !Dik :q = 6 Ton (6000 Kg), Go = 500 Kg, a = 1 m, L = 2 m, h = 4 m, o = 60 Kg/cm2, b = 600 Kg/cm2, = 0,7, = 0,1, n = 300 rpm, i = 8.

Dit :N ?

Jawab:H1 =Go . a + q . L=500 . 1 + 6000 . 2=3125 Kg

h4

d1 =

d1 ===11,75 cm

v =x d12 . o

4

v =0,785 x (11,75)2 x 60=6502,74 Kg

=

=== 1,414

Lo =1,414 . d2

H1 =Lo . d2 . o

3125 =1,414 . d2 . d2 . 60

d2 = = 6,069 cm

Maka:

N =(H1 . . (d2/2) + H1 . . (d1/2) + v . (d1/4) . ) x n

71620 . i .

N =(3125 . 0,1 . (6,069/2) + 3125 . 0,1 . (11,75/2) + 6502,74 . (11,75/4) . 0,1) x 300

71620 . 8 . 0,7

N =4694,4 x 300

401072

=3,511 Hp