Bài giảng Kỹ thuật nâng & vận chuyển - Chương 7: Cơ cấu thay đổi tầm với (Luffing mechanisms)

KYÕ THUAÄT NAÂNG–VAÄN CHUYEÅN

CHÖÔNG 7 CÔ CAÁU THAY ÑOÅI TAÀM VÔÙI (Luffing mechanisms)

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Chapter 7 1

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

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Chapter 7 2

2. PHAÂN LOAÏI: 2 loaïi

Cô caáu thay ñoåi taàm vôùi kieåu xe laên

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Chapter 7 3

2. PHAÂN LOAÏI(tt)

Cô caáu thay ñoåi taàm vôùi baèng caùch naâng haï caàn

a,b,d,e,f : lieân keát cöùng

c: thuûy löïc

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Chapter 7 4

2. PHAÂN LOAÏI (tt)

Cô caáu naâng caàn coù lieân keát meàm vôùi caàn

Söû duïng caùp ( tôøi )

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Chapter 7 5

3. TÍNH TOAÙN LÖÏC NAÂNG CAÀN

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Chapter 7 6

3. TÍNH TOAÙN LÖÏC NAÂNG CAÀN

 Löïc caêng caùp taïi tang:

 Coâng suaát:



 Vaän toác trung bình:

=> Coâng suaát trung bình:

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Chapter 7 7

 ANY QUESTIONS ?

 ………..

 THANK YOU

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Chapter 7 8