Chapter III1 KYÕ THUAÄT NAÂNG - VAÄN CHUYEÅN CHÖÔNG 3 DAÂY & CAÙC CHI TIEÁT QUAÁN, HÖÔÙNG DAÂY (WIRE ROBES AND CHAINS FOR HOISTING AND HAULAGE. LIFTING

Chapter III 1

KYÕ THUAÄT NAÂNG - VAÄN CHUYEÅN

CHÖÔNG 3DAÂY & CAÙC CHI TIEÁT QUAÁN, HÖÔÙNG DAÂY(WIRE ROBES AND CHAINS FOR HOISTING AND HAULAGE. LIFTING TACKLE, DRUM, SHEAVES, SPROCKETS)

Chapter III 2

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

Chapter III 3

Keát caáu Tuøy theo caùch beän:

-Beän ñôn -Beän keùp-Beän ba lôùp

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

hôïp

1. DAÂY CAÙP THEÙP (tt)

(wire rope)

Tuøy theo tình traïng tíeâp xuùc :-Tieáp xuùc ñöôøng -Tieáp xuùc ñieåm

Chapter III 4


(wire rope)

•Beän keùp

Chapter III 5


(wire rope)

Chapter III 6


(wire rope)

LLL %20rope LRL %20rope

RLL %20rope RRL %20rope

Caáu taïo theo chieàu cuoán

Chapter III 7

dSSn

dS max.

Tính vaø choïn daây1. 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


(wire rope)

Chapter III 8

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

Heä soáan

toaøn

Keát caáu caùp

6 x 19 = 114 sôïi

6 x 37 = 222 sôïi

Beänxuoâi

Beän cheùo

Beän xuoâi

Beäncheùo

6 6 12 11 22

6 7 14 13 26

7 8 16 15 30


(wire rope)

Chapter III 9

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


(wire rope)

Chapter III 10


(wire rope)

•Söû duïng ñuùng caùp

Chapter III 11


(wire rope)

Chapter III 12


(wire rope)

Chapter III 13


(wire rope)

Chapter III 14


(wire rope)

Chapter III 15


(wire rope)

Chapter III 16

Phöông phaùp coá ñònh ñaàu caùp treân tang


(wire rope)

Chapter III 17

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

Chapter III 18

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.

Chapter III 19

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

Chapter III 20


Chapter III 21

3.TANG CUOÁN CAÙP (drums) tt

D (e-1)dc

L=L0+L1+2L2

L0=Z.t ={l/(D+dc)}t +(1,5-2)tL0=Z.t ={a.H/(D+dc)}t +(1,5-2)tt=dc+(2-3)mm

Chapter III 22

Chieàu daày tang-Tang baèng gang: =0,02D+(6-10) mm-Tang baèng theùp: =1,2dc

Tính beàn tang-L/D<3: kieåm tra neùn: n=k.Smax/.t[n]

- L/D3:kieåm tra uoán, xoaén: u=Mu/Wu

x=Mx/Wx

-Toång öùng suaát:2x

2un 3)(


Chapter III 23


Tang coân Muïc ñích: Phaïm vi söû

duïng. maxminminmax SDSD

Chapter III 24


Chapter III 25


3. Tang vaø puly ma saùt.

Muïc ñích.Phaïm vi söû duïng.

Capstan drums (traction –type drum)

The rope connected to the 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

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

Se=Slef

Chapter III 26

4. PULY (sheaves)

Puly caùp.(Sheave grooves)

Puly xích (sprockets)

- Chain sheave for welded chain

- Sprocket for roller

Chapter III 27

4. PULY (tt):

Ñoái vôùi xích: D0 ≥ 20dÑoái vôùi caùp: D ≥ (e-1)dc

Baùn kính cuûa raõnh: r = (0,6 – 0,7)dc

Chapter III 28

4. PULY (tt) :-Hieäu suaát puly

töø ñaây ta tìm ñöôïc Wc

vôùi Löïc caûn oå truïc:

vôùi Hieäu suaát puly:

)2

)(()2( 11 b

DWSa

DS c

111 .

2

. Sb

Dba

SWc

bDba

2

1

121 ...2..2

2S

D

df

aS

D

MW msms

04,001,02

sin22

D

df

11

1

211

1

2

1

2

msc WWS

S

S

S

hS

Qh

Chapter III 29

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)

5. PALAÊNG (Lifting tackles)

Chapter III 30


a

QS0

Ñònh nghóa.Ñaëc tính cô baûn: boäi

suaát aYÙ nghóa vaät lyù:

tangvaøo daây Soávaättreo daây Soá

a

Chapter III 31

Hieäu suaát palaêng vaø löïc caêng daây lôùn nhaát:

Khi naâng:

1aa21

1a1a

2123

12

1

...1SS....SSQ

S....S...

SSSSS

S

a1 1

1QS

5. PALAÊNG (Lifting tackles) tt

Chapter III 32

tat

1maxtg 1

1QSSS

Löïc caùp leân tang:

t: soá puly ñoåi höôùng


Chapter III 33

5. PALAÊNG (tt): Hieäu suaát

palaêng

Löïc caêng caùp lôùn nhaát

h.a.S

h.Q

tgpl

a1

1n

ta

pl

plmax .a

QS

Coâng coù ích

Coâng toaøn phaàn

Chapter III 34

Palaêng keùp


Chapter III 35

Caùc sô ñoà pa laêng lôïi löïc


Chapter III 36



Chapter III 37



Chapter III 38



Chapter III 39

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


-Pa laêng lôïi toác-

Chapter III 40



Chapter III 41



Chapter III 42



Chapter III 43

DAÂY & CAÙC CHI TIEÁT QUAÁN, HÖÔÙNG DAÂY

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Chapter III1 KYÕ THUAÄT NAÂNG - VAÄN CHUYEÅN CHÖÔNG 3 DAÂY & CAÙC CHI TIEÁT QUAÁN, HÖÔÙNG DAÂY (WIRE ROBES AND CHAINS FOR HOISTING AND HAULAGE. LIFTING