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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
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
•Beän keùp
Chapter III 5
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 6
1. DAÂY CAÙP THEÙP (tt)
(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
1. DAÂY CAÙP THEÙP (tt)
(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
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 9
Noái ñaàu daây vôùi chi tieát khaùc(Attachment of ropes to machinery parts)
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 10
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
•Söû duïng ñuùng caùp
Chapter III 11
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 12
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 13
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 14
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 15
1. DAÂY CAÙP THEÙP (tt)
(wire rope)
Chapter III 16
Phöông phaùp coá ñònh ñaàu caùp treân tang
1. DAÂY CAÙP THEÙP (tt)
(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
3. TANG CUOÁN CAÙP( tt) :
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)(
3.TANG CUOÁN CAÙP (drums) tt
Chapter III 23
3.TANG CUOÁN CAÙP (drums) tt
Tang coân Muïc ñích: Phaïm vi söû
duïng. maxminminmax SDSD
Chapter III 24
3. TANG CUOÁN CAÙP( tt) :
Chapter III 25
3. TANG CUOÁN CAÙP( tt) :
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
5. PALAÊNG (Lifting tackles)
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
5. PALAÊNG (Lifting tackles) tt
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
5. PALAÊNG (Lifting tackles) tt
Chapter III 35
Caùc sô ñoà pa laêng lôïi löïc
5. PALAÊNG (Lifting tackles) tt
Chapter III 36
5. PALAÊNG (Lifting tackles) tt
Caùc sô ñoà pa laêng lôïi löïc
Chapter III 37
5. PALAÊNG (Lifting tackles) tt
Caùc sô ñoà pa laêng lôïi löïc
Chapter III 38
5. PALAÊNG (Lifting tackles)
Caùc sô ñoà pa laêng lôïi löïc
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
5. PALAÊNG (Lifting tackles) tt
-Pa laêng lôïi toác-
Chapter III 40
5. PALAÊNG (Lifting tackles) tt
-Pa laêng lôïi toác-
Chapter III 41
5. PALAÊNG (Lifting tackles) tt
-Pa laêng lôïi toác-
Chapter III 42
5. PALAÊNG (Lifting tackles) tt
-Pa laêng lôïi toác-
Chapter III 43
DAÂY & CAÙC CHI TIEÁT QUAÁN, HÖÔÙNG DAÂY
ANY QUESTIONS ?
………..
THANK YOU
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