Bài giảng Kỹ thuật nâng & vận chuyển - Chương 6: Cơ cấu di chuyển (traveling mechanisme)

KYÕ THUAÄT NAÂNG VAÄN CHUYEÅN

CHÖÔNG 6. CÔ CAÁU DI CHUYEÅN (TRAVELING MECHANISME)

Chapter 6

1

CuuDuongThanCong.com https://fb.com/tailieudientucntt

1. PHAÂN LOAÏI

Cô caáu di chuyeån

Cô caáu di chuyeån khoâng ray

Cô caáu di chuyeån treân ray

Cô caáu ñaët trong phaàn di chuyeån

Di chuyeån baèng baùnh xích

Cô caáu ñaët ngoøai phaàn di chuyeån

Di chuyeån baèng baùnh hôi

Chapter 6

2

CuuDuongThanCong.com https://fb.com/tailieudientucntt

1. PHAÂN LOAÏI (tt)

Cô caáu di chuyeån treân ray

Cô caáu ñaët trong phaàn di chuyeån Chapter 6

3

CuuDuongThanCong.com https://fb.com/tailieudientucntt

1. PHAÂN LOAÏI (tt)

Cô caáu di chuyeån treân ray

Cô caáu ñaët ngoaøi phaàn di chuyeån Chapter 6

4

CuuDuongThanCong.com https://fb.com/tailieudientucntt

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

CuuDuongThanCong.com https://fb.com/tailieudientucntt

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

CuuDuongThanCong.com https://fb.com/tailieudientucntt

2. CAÁU TAÏO

Sô ñoà cô caáu di chuyeån daïng caàu(tt)

b. Daãn ñoäng taäp trung coù truïc truyeàn toác ñoä cao:

-> nheï.

 Öu ñieåm  Nhöôïc

: ntr ↑ => Mx : yeâu caàu laép raùp chính xaùc.

Traveling motion is effected by a high-speed cross- shaft

Chapter 6

7

CuuDuongThanCong.com https://fb.com/tailieudientucntt

2. CAÁU TAÏO

Sô ñoà cô caáu di chuyeån daïng caàu(tt)

Daãn ñoäng taäp trung

Chapter 6

8

CuuDuongThanCong.com https://fb.com/tailieudientucntt

2. CAÁU TAÏO

Sô ñoà cô caáu di chuyeån daïng caàu(tt)

Daãn ñoäng taäp trung

Chapter 6

9

CuuDuongThanCong.com https://fb.com/tailieudientucntt

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

CuuDuongThanCong.com https://fb.com/tailieudientucntt

2. CAÁU TAÏO

Sô ñoà cô caáu di chuyeån daïng caàu(tt)

Daãn ñoäng rieâng

Chapter 6

11

CuuDuongThanCong.com https://fb.com/tailieudientucntt

2. CAÁU TAÏO

Sô ñoà cô caáu di chuyeån daïng caàu(tt)

Daãn ñoäng rieâng

12

Chapter 6

CuuDuongThanCong.com https://fb.com/tailieudientucntt

3. BAÙNH XE (wheel)

Chapter 6

13

CuuDuongThanCong.com https://fb.com/tailieudientucntt

3. BAÙNH XE (wheel)

 Kieåm tra öùng suaát daäp theo Kovalxki

 Tieáp xuùc ñöôøng:

 Tieáp xuùc ñieåm:

Chapter 6

14

CuuDuongThanCong.com https://fb.com/tailieudientucntt

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

CuuDuongThanCong.com https://fb.com/tailieudientucntt

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:  Momen ma saùt:

 Momen caûn laên:

Chapter 6

16

CuuDuongThanCong.com https://fb.com/tailieudientucntt

4. XAÙC ÑÒNH LÖÏC CAÛN VAØ COÂNG SUAÁT ÑOÄNG CÔ (tt)

b. Löïc caûn ñoä nghieâng.

c. Löïc caûn gioù:



Löïc caûn toång coäng:

 Coâng suaát ñoäng cô:

Chapter 6

17

CuuDuongThanCong.com https://fb.com/tailieudientucntt

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

-Mt : is the moment of resistance to crane or trolley with load

-M1 : the resistance moment due to inertia consists of the moment due to inertia of gyrating masses of the mechanism.

-M2 :the moment due to the inertia of the rectilinearly displacing masses of load and crane trolley

Chapter 6

18

CuuDuongThanCong.com https://fb.com/tailieudientucntt

5.MÔÛ MAÙY VAØ PHANH CÔ CAÁU DI CHUYEÅN

(starting and stopping the traveling motion

 The adhesion margin at starting is given then by

 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.

Chapter 6

19

 Kieåm tra Mm ñeå choïn ñoäng cô coù Mm nhoû hôn.  Taêng heä soá baùm

(raéc caùt).

CuuDuongThanCong.com https://fb.com/tailieudientucntt

5.MÔÛ MAÙY VAØ PHANH CÔ CAÁU DI CHUYEÅN

(starting and stopping the traveling motion

 At stopping

Chapter 6

20

CuuDuongThanCong.com https://fb.com/tailieudientucntt

5.MÔÛ MAÙY VAØ PHANH CÔ CAÁU DI CHUYEÅN

(starting and stopping the traveling motion

 Stopping - The process of stopping is essentially identical with of starting. - What is different is that at starting the resistance to motion retards acceleration and must be counteracted by increasing motor power whereas at stopping it assist in bringing the motion at rest, adding to the retardation and lessening the amount of work to be done by the brake

Chapter 6

21

CuuDuongThanCong.com https://fb.com/tailieudientucntt

6. TRÌNH TÖÏ TÍNH TOAÙN CÔ

CAÁU DI CHUYEÅN

a. Daãn ñoäng baèng ñieän:

 Cho:

 Sô ñoà hình hoïc xe: caùc kích thöôùc khoaûng caùch truïc, khoaûng

caùch veát baùnh xe, sô ñoà caáu taïo.

 Q,G,v,F,CD%.

 Trình töï:

1. Xaùc ñònh kích thöôùc baùnh xe vaø ray. 2. W? => nñc. 3. i ? 4. Kieåm tra Mm ñaûm baûo Kb ≥ 1,2. 5. Phanh ? 6. Hoäp giaûm toác ? 7. Tính caùc chi tieát khaùc.

Chapter 6

22

CuuDuongThanCong.com https://fb.com/tailieudientucntt

5. TRÌNH TÖÏ TÍNH TOAÙN CÔ CAÁU DI CHUYEÅN (tt)

b. Cô caáu daãn ñoäng baèng tay.

 Caùc soá lieäu: Sô ñoà hình hoïc, sô ñoà caáu taïo, Q,G,F,



i ?

m. Trình töï: 1. Xaùc ñònh kích thöôùc baùnh xe vaø ray. 2. Xaùc ñònh Wt . 3. 4. Thieát keá vaø choïn boä truyeàn. 5. Tính toaùn caùc chi tieát coøn laïi (loaïi naøy khoâng duøng

phanh).

Chapter 6

23

CuuDuongThanCong.com https://fb.com/tailieudientucntt

6. CÔ CAÁU DI CHUYEÅN BAÈNG DAÂY KEÙO

(Rope- and chain- operated cross-traverse

mechanisms)

W1 W2 S H

- Löïc caûn ma saùt laên - Löïc caûn gioù - Löïc caêng dö caùp naâng: - Löïc truøng caùp

Chapter 6

24

CuuDuongThanCong.com https://fb.com/tailieudientucntt

6. CÔ CAÁU DI CHUYEÅN BAÈNG DAÂY KEÙO

(Rope- and chain- operated cross-traverse mechanisms)

- Löïc caûn ma saùt laên - Löïc caûn gioù

 W1  W2 

S - Löïc caêng dö caùp naâng:

 Theo sô ñoà

 Toång quaùt

 H

- Löïc truøng caùp

Chapter 6

25

CuuDuongThanCong.com https://fb.com/tailieudientucntt

6. CÔ CAÁU DI CHUYEÅN BAÈNG DAÂY KEÙO

(Rope- and chain- operated cross-traverse mechanisms)

 Coâng suaát ñoäng cô:

 Momen truïc tang daãn ñoäng:

 Coâng suaát:

Chapter 6

26

CuuDuongThanCong.com https://fb.com/tailieudientucntt

 ANY QUESTIONS ?

 ………..

 THANK YOU

Chapter 6

27

CuuDuongThanCong.com https://fb.com/tailieudientucntt