KYÕ THUAÄT NAÂNG - VAÄN CHUYEÅN

CHÖÔNG 3

DAÂY & CAÙC CHI TIEÁT QUAÁN, HÖÔÙNG DAÂY (WIRE ROBES AND CHAINS FOR HOISTING AND HAULAGE. LIFTING TACKLE, DRUM, SHEAVES, SPROCKETS)

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Chapter III 1

1. DAÂY CAÙP THEÙP

(wire rope)

Caáu taïo:

-Cheá taïo töø nhöõng sôïi theùp saùng hay traùng keõm ñöôøng kính töø 0,2-3mm ñaõ ñöôïc hoùa cöùng

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Chapter III 2

1. DAÂY CAÙP THEÙP (tt)

(wire rope)

 Keát caáu  Tuøy theo caùch beän:

 Tuøy theo tình traïng tíeâp xuùc :

-Tieáp xuùc ñöôøng -Tieáp xuùc ñieåm

-Beän ñôn -Beän keùp -Beän ba lôùp

 Tuøy theo chieàu cuoán : -Beän xuoâi - beän cheùo - Beän toång hôïp

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Chapter III 3

1. DAÂY CAÙP THEÙP (tt)

(wire rope)

•Beän keùp

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Chapter III 4

1. DAÂY CAÙP THEÙP (tt)

(wire rope)

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Chapter III 5

1. DAÂY CAÙP THEÙP (tt) (wire rope)

Caáu taïo theo chieàu cuoán

LLL %20rope

LRL %20rope

RLL %20rope

RRL %20rope

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Chapter III 6

1. DAÂY CAÙP THEÙP (tt) (wire rope)

 Tính vaø choïn daây 1. Individual wires, the ropes – an object of intricate construction-

is composed of, are subject to various stresses in service (contact, tension, bending, and twisting)

2. A mathematical treatment of all the factors controlling the

wires of rope is practical impossible

3. Codes used in rope design are based on factors of maximum

rope tension, and safety

4. Ropes are selected from applicable standards, using the

relationship

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Chapter III 7

1. DAÂY CAÙP THEÙP (tt) (wire rope)

 Söû duïng caùp -Caùp thöôøng khoâng ñöùt töùc thôøi. -Chæ loïai boû caùp khi soá sôïi ñöùt caùp treân moät böôùc daøi vöôït

soá sôïi cho pheùp

Keát caáu caùp

6 x 19 = 114 sôïi

6 x 37 = 222 sôïi

Heä soá an toaøn

Beän xuoâi

Beän cheùo

Beän xuoâi

Beän cheùo

6

12

11

22

6

6

7

14

13

26

7

8

16

15

30

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Chapter III 8

1. DAÂY CAÙP THEÙP (tt) (wire rope)

 Noái ñaàu daây vôùi chi tieát khaùc (Attachment of ropes to machinery parts)

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Chapter III 9

1. DAÂY CAÙP THEÙP (tt) (wire rope)

•Söû duïng ñuùng caùp

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Chapter III 10

1. DAÂY CAÙP THEÙP (tt) (wire rope)

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Chapter III 11

1. DAÂY CAÙP THEÙP (tt) (wire rope)

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Chapter III 12

1. DAÂY CAÙP THEÙP (tt) (wire rope)

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Chapter III 13

1. DAÂY CAÙP THEÙP (tt) (wire rope)

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Chapter III 14

1. DAÂY CAÙP THEÙP (tt) (wire rope)

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Chapter III 15

1. DAÂY CAÙP THEÙP (tt) (wire rope)

Phöông phaùp coá ñònh ñaàu caùp treân tang

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Chapter III 16

2. XÍCH (chains)

 Xích haøn (welded) -These are widely used in hoisting installation as pliable members -Welded chains fall in to ordinary type and calibrated one differing by the accuracy of fabrication

Xích baûn leà ( roller chains) -Roller chains consist of steel plates hinge- joined by pins -Normally the chains are tested by the manufacturer with a load equal to half the breaking one -Roller chains are ore reliable than welded - Roller chains are heavier and more costly then welded ones

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Chapter III 17

3. TANG CUOÁN CAÙP (drums)

 Muïc ñích:  Phaân loaïi:

Tang truï. Tang coân. Tang ma saùt.

 Caáu taïo, cheá taïo:

Moät lôùp, nhieàu lôùp. Coù raõnh, khoâng coù raõnh. Ñuùc haøn.

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Chapter III 18

3. TANG CUOÁN CAÙP( tt) :

1. Tang truï. -Distinction is made between drums spooling the rope in one layer and those on which the rope is wound is more than one layer - The winding face of drum is made smooth or provided machined helical grooves

Caùc thoâng soá cô baûn : L,t, D

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Chapter III 19

3. TANG CUOÁN CAÙP( tt) :

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Chapter III 20

3.TANG CUOÁN CAÙP (drums) tt

D (e-1)dc L=L0+L1+2L2 L0=Z.t ={l/ (D+dc)}t +(1,5-2)t L0=Z.t ={a.H/ (D+dc)}t +(1,5-2)t t=dc+(2-3)mm

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Chapter III 21

3.TANG CUOÁN CAÙP (drums) tt

 Chieàu daày tang

-Tang baèng gang: -Tang baèng theùp:

=0,02D+(6-10) mm =1,2dc

 Tính beàn tang

n=k.Smax/ .t [ n]

-L/D<3: kieåm tra neùn: - L/D 3:kieåm tra uoán, xoaén:

u=Mu/Wu x=Mx/Wx

-Toång öùng suaát:

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Chapter III 22

3.TANG CUOÁN CAÙP (drums) tt

 Tang coân

 Muïc ñích:

 Phaïm vi söû duïng.

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Chapter III 23

3. TANG CUOÁN CAÙP( tt) :

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Chapter III 24

3. TANG CUOÁN CAÙP( tt) :

3. Tang vaø puly ma saùt. Capstan drums (traction –type drum)

Muïc ñích. Phaïm vi söû duïng.

The rope connected to the

Hence according to Euler, the tension in the entering side of rope connected to the load is given:

load is not fastened to the drum but is held fast to it owing to traction between the drum surface and a few turn of rope coiled around the drum

Se=Slef

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Chapter III 25

4. PULY (sheaves)

 Puly caùp. (Sheave grooves)

 Puly xích (sprockets) - Chain

sheave

for

welded chain

- Sprocket for roller

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Chapter III 26

4. PULY (tt):

Ñoái vôùi xích: D0 ≥ 20d Ñoái vôùi caùp: D ≥ (e-1)dc Baùn kính cuûa raõnh: r = (0,6 – 0,7)dc

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Chapter III 27

4. PULY (tt) :

-Hieäu suaát puly

 töø ñaây ta tìm ñöôïc Wc

vôùi  Löïc caûn oå truïc:

vôùi  Hieäu suaát puly:

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Chapter III 28

5. PALAÊNG (Lifting tackles)

DEFINITION

 A lifting tackles is a system of stationary and movable

sheaves interlinked by a pliable member in form of a wire rope to obtain a gain in either force ( power lifting tackle) or speed ( speed lifting tackle)

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Chapter III 29

5. PALAÊNG (Lifting tackles)

Ñònh nghóa. Ñaëc tính cô baûn: boäi suaát a YÙ nghóa vaät lyù:

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Chapter III 30

5. PALAÊNG (Lifting tackles) tt

 Hieäu suaát palaêng vaø löïc caêng daây lôùn nhaát: Khi naâng:

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Chapter III 31

5. PALAÊNG (Lifting tackles) tt

Löïc caùp leân tang:

t: soá puly ñoåi höôùng

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Chapter III 32

5. PALAÊNG (tt):

 Hieäu suaát palaêng

Coâng coù ích

Coâng toaøn phaàn

 Löïc caêng caùp lôùn

nhaát

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Chapter III 33

5. PALAÊNG (Lifting tackles) tt

 Palaêng keùp

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Chapter III 34

5. PALAÊNG (Lifting tackles) tt

 Caùc sô ñoà pa laêng lôïi löïc

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Chapter III 35

5. PALAÊNG (Lifting tackles) tt

 Caùc sô ñoà pa laêng lôïi löïc

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Chapter III 36

5. PALAÊNG (Lifting tackles) tt

 Caùc sô ñoà pa laêng lôïi löïc

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Chapter III 37

5. PALAÊNG (Lifting tackles)

 Caùc sô ñoà pa laêng lôïi löïc

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Chapter III 38

5. PALAÊNG (Lifting tackles) tt

-Pa laêng lôïi toác-

 A velocity lifting tackle -The principles of velocity lifting tackle design are basically the same as those employed for its power counterpart.

-When the lifting tackle frame (point A) displaces through a distance h, the load moves through the distance H=ah, Where a is number of rope part reeved through the velocity lifting tackle.

-Hence, the velocity of hoisting the

load is - Vload =a.V A

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Chapter III 39

5. PALAÊNG (Lifting tackles) tt

-Pa laêng lôïi toác-

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Chapter III 40

5. PALAÊNG (Lifting tackles) tt

-Pa laêng lôïi toác-

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Chapter III 41

5. PALAÊNG (Lifting tackles) tt

-Pa laêng lôïi toác-

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Chapter III 42

DAÂY & CAÙC CHI TIEÁT QUAÁN,

HÖÔÙNG DAÂY

 ANY QUESTIONS ?

 ………..

 THANK YOU

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Chapter III 43