Bài giảng Kỹ thuật nâng & vận chuyển - Chương 8: Cơ cấu quay (Slewing mechanisms)

KYÕ THUAÄT NAÂNG – VAÄN CHUYEÅN

CHÖÔNG 8 CÔ CAÁU QUAY (slewing mechanisms)

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Chapter 8 1

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

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Chapter 8 2

2. PHAÂN LOAÏI

a. Coät quay

b. Coät coá ñònh

c. Voøng töïa quay

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Chapter 8 3

PHAÂN LOAÏI (tt)

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Chapter 8 4

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.  Baùnh raêng lôùn.

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Chapter 8 5

SÔ ÑOÀ CÔ CAÁU QUAY

TRAÏM DAÃN ÑOÄNG ÑAËT TREÂN PHAÀN QUAY

 Phanh  Khôùp noái  Hoäp giaûm toác  Caëp baùnh raêng coân  Baùnh raêng nhoû.  Baùnh raêng lôùn.

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Chapter 8 6

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.

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Chapter 8 7

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.

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Chapter 8 8

4. MOÂMEN CAÛN QUAY

 M1: Moâmen do ma saùt.  M2: Moâmen do gioù.  M3: Moâmen do ñoä nghieâng.

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Chapter 8 9

MOÂMEN CAÛN QUAY (tt) :

a. Momen caûn do ma saùt ôû

goái töïa

 loaïi caàn truïc coät quay

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Chapter 8 10

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:

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Chapter 8 11

MOÂMEN CAÛN QUAY (tt):

 Ma saùt oå:

 Tuøy thuoäc oå coù Mv:





(oå laên, d0 : ñöôøng kính ngoõng truïc). (oå tröôït.)



(goùt vaønh khaên : )

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Chapter 8 12

MOÂMEN CAÛN QUAY (tt) :

 Loaïi coät coá ñònh  Phaûn löïc goái töïa:

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Chapter 8 13

MOÂMEN CAÛN QUAY (tt) :

 Momen ma saùt ôû oå.

(OÅ laên thöôøng)

 OÅ döôùi duøng con laên.

-> Chính xaùc:

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Chapter 8 14

MOÂMEN CAÛN QUAY (tt) :

b. Momen caûn quay do ñoä nghieâng: M2

c. Momen caûn quay

do gioù: M3

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Chapter 8 15

MOÂMEN CAÛN QUAY (tt) :

d. Moâmen caûn do quaùn tính

 Mñ1 : cuûa chi tieát quay phaàn daãn ñoäng.

 Mñ2: cuûa vaät quay quanh truïc (ôû khoûang caùch L)

 Mñ3 : cuûa caùc phaàn quay.

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Chapter 8 16

MOÂMEN CAÛN QUAY (tt) :

 Coâng suaát ñoäng cô

 hoaëc

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Chapter 8 17

 ANY QUESTIONS ?

 ………..

 THANK YOU

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Chapter 8 18