KY THUAT

1. Chapter 7 1
KYÕ THUAÄT NAÂNG–VAÄN CHUYEÅN
CHÖÔNG 7
CÔ CAÁU THAY ÑOÅI TAÀM VÔÙI
(Luffing mechanisms)

2. Chapter 7 2
1. KHAÙI NIEÄM
-Luffing or derricking is pivoting of crane jib in a vertical plane so as to
change the reach
-The reach can be also changed:- on certain jib and revolving crane by mean
of a trolley traveling over horizontal; -or inclined flanges of the jib

3. Chapter 7 3
2. PHAÂN LOAÏI: 2 loaïi
Côcaáu thay ñoåi taàm vôùi
kieåu xelaên

4. Chapter 7 4
2. PHAÂN LOAÏI(tt)
Côcaáu thay ñoåi taàm
vôùi baèng caùchnaâng
haï caàn
a,b,d,e,f:lieân keátcöùng
c:thuûylöïc

5. Chapter 7 5
2. PHAÂN LOAÏI (tt)
Côcaáu naângcaàn
coù lieân keát
meàm vôùi caàn
Söûduïng caùp( tôøi)

6. Chapter 7 6
3. TÍNH TOAÙN LÖÏC NAÂNG CAÀN
h
HWcWeSbGQL
TM vcc
cO
....
0



7. Chapter 7 7
3. TÍNH TOAÙN LÖÏC NAÂNG CAÀN
 Löïccaêng caùp taïitang:
 Coâng suaát:

 Vaän toác trungbình:
=> Coângsuaát trungbình:
t
p
c
a
T
S
...
max


.102
.max
max
vS
N 
t
lla
V
t
aLL
Vtb
)().( 21
21
minmax 


 


 n
i
nn
tb
t
tNtNtN
N
......... 2
2
2
21
2
1

8. Chapter 7 8
 ANY QUESTIONS ?
 ………..
 THANK YOU