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- Bài giảng Kỹ thuật nâng & vận chuyển - Chương 8: Cơ cấu quay (Slewing mechanisms)
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- KYÕ THUAÄT NAÂNG – VAÄN CHUYEÅN
CHÖÔNG 8
CÔ CAÁU QUAY
(slewing mechanisms)
Chapter 8 1
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- 1. KHAÙI NIEÄM
The slewing mechanism serve the purpose of
imparting rotary motion to metal structure of
crane integrally with the hook load.
It differs materially from the rest of crane
mechanisms consider above in that involved
in the motion are gyrating masses alone, non
of the rectilinearly displacing ones
Chapter 8 2
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- 2. PHAÂN LOAÏI
a. Coät quay b. Coät coá ñònh c. Voøng töïa quay
Chapter 8 3
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- PHAÂN LOAÏI (tt)
Chapter 8 4
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- 3. SÔ ÑOÀ CÔ CAÁU QUAY
TRAÏM DAÃN ÑOÄNG ÑAËT TREÂN
PHAÀN COÁ ÑÒNH
Ñoäng cô.
Phanh
Khôùp noái
Hoäp giaûm toác
Baùnh raêng nhoû.
6 5 4 3 2 1
Baùnh raêng lôùn.
Chapter 8 5
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- SÔ ÑOÀ CÔ CAÁU QUAY
TRAÏM DAÃN ÑOÄNG ÑAËT
TREÂN PHAÀN QUAY
4 3 2 1 Phanh
5 Khôùp noái
Hoäp giaûm toác
Caëp baùnh raêng coân
Baùnh raêng nhoû.
Baùnh raêng lôùn.
6 7
Chapter 8 6
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- SÔ ÑOÀ CÔ CAÁU QUAY
Nguyeân lyù laøm vieäc:
1. Ñoäng cô.
2. Truïc vít.
3. Baùnh vít
4. Baùnh raêng nhoû.
5. Baùnh raêng lôùn.
Chapter 8 7
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- SÔ ÑOÀ CÔ CAÁU QUAY (tt):
Tæ soá truyeàn: i = 1000 -> itv = 30 40 vaø
ibr = 10 25
Baùnh raêng lôùn baèng theùp uoán laïi thaønh
hình troøn vaø ñaët choát ôû nhöõng khoûang caùch
baèng nhau.
Chapter 8 8
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- 4. MOÂMEN CAÛN QUAY
M q
M 1
M 2
M 3
M1: Moâmen do ma saùt.
M2: Moâmen do gioù.
M3: Moâmen do ñoä nghieâng.
Chapter 8 9
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- MOÂMEN CAÛN QUAY (tt) :
a. Momen caûn do ma saùt ôû
goái töïa
loaïi caàn truïc coät quay
Chapter 8 10
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- MOÂMEN CAÛN QUAY (tt):
Loaïi caàn truïc coät quay.
Q: troïng löôïng vaät naâng.
G: troïng löôïng keát caáu kim loaïi
daøn caàn.
Caùc phaûn löïc goái töïa:
G .a Q .L
V Q G H
h
Chapter 8 11
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- MOÂMEN CAÛN QUAY (tt):
Ma saùt oå: M ms
Ai . i
.r i
tr d d
M 1
M H
M H
M V
tr d1
M H
H . .
2
Moâmen caûn do phaûn löïc theo phöông ngang.
d d2
M H
H . .
2
Tuøy thuoäc oå coù Mv:
M V
d
.V .
d0
(oå laên, d0 : ñöôøng kính ngoõng truïc).
2
M V
d
.V .
d
(oå tröôït.)
3
(goùt vaønh khaên : d )
d tb d ng
d tr
M V
d
.V . tb
2 2
Chapter 8 12
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- MOÂMEN CAÛN QUAY (tt) :
Loaïi coät coá ñònh
Phaûn löïc goái töïa:
V Q G Gd
Q .L G .a G d .b
H
h
Chapter 8 13
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- MOÂMEN CAÛN QUAY (tt) :
Momen ma saùt ôû oå. M M M 1
d
H
tr
H
M
tr
v
M
d
.H .
H
d
(OÅ laên thöôøng)
1
2
tr d 2
M H
.H .
2
OÅ döôùi duøng con laên.
H
N .d 1 2. f
W 2 .N .
2 . cos d
2 H D
d
M H
( .d 1 2 . f ).
2
d . cos
2
-> Chính xaùc: M
d
H
W .
D
2 . f .N
2
d H .d 1 . D D
M H
[ 2 f( 1 )]
d d
2 . cos
2
( ) : coät coá ñònh (-) : coät quay. Chapter 8 14
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- MOÂMEN CAÛN QUAY (tt) :
b. Momen caûn quay
do ñoä nghieâng: M2
M 2
Q .L G c .a G q .b sin
Gqsin
b
c. Momen caûn quay
do gioù: M3 a
L
M q F v .L F c .a F q .b Gcsin
3
Qsin
Chapter 8 15
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- MOÂMEN CAÛN QUAY (tt) :
d. Moâmen caûn do quaùn tính
M cq
M M M M t
m t d
i.
Mñ1 : cuûa chi tieát quay phaàn daãn ñoäng.
2
G . D . n dc
M d1
(1 ,1 1 , 2 ).
375 .t m
Mñ2: cuûa vaät quay quanh truïc (ôû khoûang caùch L)
2
Q . L .n dc
M d 2 2
375 .t m .i m
Mñ3 : cuûa caùc phaàn quay.
2 60 .
( G c . D c ). n dc tm
M d 3 2 .n c
375 .t m .i 0
Chapter 8 16
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- MOÂMEN CAÛN QUAY (tt) :
Coâng suaát ñoäng cô
M t
1,3 .M d
N dc
.n
975 .
hoaëc
M t .n
N dc
975 . .
Chapter 8 17
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- ANY QUESTIONS ?
………..
THANK YOU
Chapter 8 18
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