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- Bài giảng Kỹ thuật nâng & vận chuyển - Chương 6: Cơ cấu di chuyển (traveling mechanisme)
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- KYÕ THUAÄT NAÂNG VAÄN CHUYEÅN
CHÖÔNG 6. CÔ CAÁU DI CHUYEÅN
(TRAVELING MECHANISME)
Chapter 6 1
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- 1. PHAÂN LOAÏI
Cô caáu di chuyeån
Cô caáu di chuyeån treân ray Cô caáu di chuyeån khoâng ray
Cô caáu ñaët trong
Di chuyeån baèng
phaàn di chuyeån
baùnh xích
Cô caáu ñaët ngoøai Di chuyeån baèng
phaàn di chuyeån baùnh hôi
Chapter 6 2
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- 1. PHAÂN LOAÏI (tt)
Cô caáu di chuyeån treân ray
Cô caáu ñaët trong phaàn di chuyeån
Chapter 6 3
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- 1. PHAÂN LOAÏI (tt)
Cô caáu di chuyeån treân ray
Cô caáu ñaët ngoaøi phaàn di chuyeån
Chapter 6 4
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- 1. PHAÂN LOAÏI (tt)
Cô caáu di chuyeån khoâng ray Cô caáu di chuyeån khoâng ray
Di chuyeån baèng baùnh hôi Di chuyeån baèng baùnh xích
Chapter 6 5
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- 2. CAÁU TAÏO
Sô ñoà cô caáu di chuyeån daïng caàu
a. Daãn ñoäng taäp trung truïc truyeàn toác ñoä thaáp (trong sô
ñoà cô caáu di chuyeån xe con):
Öu ñieåm : truyeàn ñoäng kín.
Nhöôïc ñieåm : ntr => Mx ↑ -> naëng.
Traveling motion is effected by a low- speed cross-shaft driven by a
motor and reduction gear at the centre of the bridge.
Chapter 6 6
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- 2. CAÁU TAÏO
Sô ñoà cô caáu di chuyeån daïng caàu(tt)
b. Daãn ñoäng taäp trung coù truïc truyeàn toác ñoä cao:
Öu ñieåm : ntr ↑ => Mx -> nheï.
Nhöôïc : yeâu caàu laép raùp chính xaùc.
Traveling motion is effected by a high-speed cross- shaft
Chapter 6 7
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- 2. CAÁU TAÏO
Sô ñoà cô caáu di chuyeån daïng caàu(tt)
Daãn ñoäng taäp trung
Chapter 6 8
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- 2. CAÁU TAÏO
Sô ñoà cô caáu di chuyeån daïng caàu(tt)
Daãn ñoäng taäp trung
Chapter 6 9
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- 2. CAÁU TAÏO
Sô ñoà cô caáu di chuyeån daïng caàu(tt)
c. Daãn ñoäng rieâng:
Öu:
Deã laép raùp, baûo döôõng
Nheï.
Söû duïng khi taàm roäng lôùn: 16m↑ ; L/B < 6.
Nhöôïc: caàn löu yù khaû naêng ñ/c ñoàng toác.
Traveling motion effected by individual drive
Chapter 6 10
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- 2. CAÁU TAÏO
Sô ñoà cô caáu di chuyeån daïng caàu(tt)
Daãn ñoäng rieâng
Chapter 6 11
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- 2. CAÁU TAÏO
Sô ñoà cô caáu di chuyeån daïng caàu(tt)
Daãn ñoäng rieâng
Chapter 6 12
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- 3. BAÙNH XE (wheel)
Chapter 6 13
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- 3. BAÙNH XE (wheel)
Kieåm tra öùng suaát daäp theo Kovalxki
Tieáp xuùc ñöôøng:
P .E
d
0 ,167 . k f . [ d
]
.b . R
Tieáp xuùc ñieåm:
2
P .E
d
k .k f
3
2
[ d
]
R1
R1 4
2 .E 1 .E 2 P k g .k n . D c
k 0 , 09 . 9 ( ) (R1 R2) k f
CD % E
R2 E1 E2
Chapter 6 14
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- 4. XAÙC ÑÒNH LÖÏC CAÛN VAØ
COÂNG SUAÁT ÑOÄNG CÔ
Caùc löïc caûn (The resistance to
motion)
Ma saùt, gioù, ñoä nghieâng.
Quaùn tính (khi laøm vieäc khoâng oån ñònh).
The resistance the motor of a bridge or
trolley drive has to overcome in
producing motion along the track is that
due to friction, inertia, wind effect and,
in some instances, the resistance due to
track gradient Chapter 6 15
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- 4. XAÙC ÑÒNH LÖÏC CAÛN VAØ
COÂNG SUAÁT ÑOÄNG CÔ (tt)
a. Löïc caûn ma saùt: Ma saùt laên giöõa baùnh xe vaø ray.
Ma saùt coå truïc baùnh xe.
Ma saùt gôø baùnh xe.
Löïc caûn ma saùt laên:
d
Momen ma saùt: M ms
M 1
M 2
F.
2
N .
d
Q G f . Q G
2
d
M ms
Q G f
2
Momen caûn laên: M cl
W1
D
2
f .d 2.
M ms
M cl W1 k( Q G ) vôùi k - heä soá caûn gôø
D
Chapter 6 16
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- 4. XAÙC ÑÒNH LÖÏC CAÛN VAØ
COÂNG SUAÁT ÑOÄNG CÔ (tt)
b. Löïc caûn ñoä nghieâng.
W 2
Q G sin
W 2
Q G
c. Löïc caûn gioù:
W3 q F0 Fv
Löïc caûn toång coäng:
W W1 W2 W3
Coâng suaát ñoäng cô: N
W .v
( kW )
60 . 102 .
vôùi : W (kG) ; v (m/phuùt)
Chapter 6 17
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- 5.MÔÛ MAÙY VAØ PHANH CÔ CAÁU DI CHUYEÅN
(starting and stopping the traveling motion)
Starting
-The equation of moments at starting is given by M m
M t
M 1
M 2
-Mt : is the moment of resistance to crane or M k( Q G )
fd 2
trolley with load
t
2i
-M1 : the resistance moment due to inertia (Q G ) D n dc
2
consists of the moment due to inertia of M t 2
375 .i t m
gyrating masses of the mechanism.
-M2 :the moment due to the inertia of the
2
( G i D i )I n dc
M k
rectilinearly displacing masses of load and crane t
375 .t m
trolley
Chapter 6 18
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- 5.MÔÛ MAÙY VAØ PHANH CÔ CAÁU DI CHUYEÅN
(starting and stopping the traveling motion
The adhesion margin at starting is given then by
Gd
K b
1 ,25
0 m d j
W Gd f G
n D g
Ñoái vôùi maùy truïc daãn ñoäng rieâng bieät: Kb ñöôïc tính khi chæ moät
ñoäng cô laøm vieäc, vaät treo phía khoâng laøm vieäc. Khi ñoù khoâng tính
löïc quaùn tính khi môû maùy:Kb ≥ 1,1.
Ñeå taêng löïc baùm:
Khôûi ñoäng baèng 4 baùnh xe daân ñoäng khi ñaït ñöôïc vaän toác oån
ñònh thì taét bôùt 2 ñoäng cô.
Kieåm tra Mm ñeå choïn ñoäng cô coù Mm nhoû hôn.
Taêng heä soá baùm (raéc caùt). Chapter 6 19
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- 5.MÔÛ MAÙY VAØ PHANH CÔ CAÁU DI CHUYEÅN
(starting and stopping the traveling motion
At stopping K b
Gd.
1, 2
Ji
G. Wt
g
Chapter 6 20
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