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Modied design

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Scope of design

Selection of gear motor

Design of shaft

Design of wire rope Design of Pulley

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Selection of Geared motor

Design considerations

Total loads to be lifted, W = Weight of the moable waterspraying arrangement ! weight of the wire braided

"e#ible hose with water

= $%% &g

'actor of safety(')S* = +

elocity of the moing

arrangement, = %-. m/s

0cceleration of the

moing arrangement, a = %-. m/s+

Total load consider , ' = ')S # W # (g ! a*

= +%1+ 2

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Selection of Geared motor

rpm+3-+4

%-5.671%6%-.

D67

1%62pulley,ofSpeed

2m5.%-5.+

%-5.6+%1+

D/+#'re8uiredTor8ue

mm5.%Dpulley,theofDiameter

=

=

=

=

=

=

=

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Selection of Geared motor

&W$-$motorSelected

W$%%$1%

5.%-56+3-+4676+

1%

T62676+Pre8uired,Power

=

=

=

=

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'inding the Tensions

T$9 Tension in tight side of pulley

T+ 9 Tension in slac& side of pulley

0ngle of wrap, : = $4% ;

= %-+Semi grooe angle of pulley, ? = ++-. ;

We &now that ,

T$/ T+= e: > cosec ?

(T$ @ T+* # = P)n soling we get,

Tension in tight side of pulley, T$= +4A+-3 2

Tension in slac& side of pulley, T+= A4%-3 2

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Design of shaft

2m5.%-5.shaftbydtransmitteTor8ure

2m$5+-B1

A

-$1655+A

A/l#'Mshaft,theinmomentbendingMa#imum

mm$1%lsupports,shaftbetweenDistance

255+A

TT',shafttheonactingtensiontodueCoad

t

+$t

=

=

=

=

=

=

+=

Dmomentbendingand

mometurningfordesignedisshaftThe

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Design of shaft

mm

m-

66753A-356$1

E67

T6$1shafttheofDiameter

MPa$3%Estress,shear0llowableA.9

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Design of wire rope

We are using wire rope haing 1 strands and $B wire per eachstrand ( 1 # $B * with tensile strength of $1%% MPa formoing the spray water assembly-

'actor of safety considered for designing wire rope is 4-

So, total factor of safety is $1 ( 46+*

Weight of the moing system ,W = $%%% 2

Coad acting on the rope = W 6 ')S

= $1%%% 2

Tensile strength of the rope = .A% d+

Where d is the nominal diameter of the rope

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Design of wire rope

F8uating tensile strength of the rope to load to nd thediameter of rope

2ominal diameter of the rope is 4 mm

mm.-A.A%

$1%%d

d.A% +

=

=

=16000

mm%-.%A

46%-%15

d6%-%15dwire,theofDiamter w

=

=

=

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Design of wire rope

+

+

+

mm+A-5+

46%-%15

d6%-540rope,theof0rea

=

=

=

253-$3646%-%515

6d6%-%515wrope,theofWeight+

+

=

=

=

16

16

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Design of wire rope

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Design of wire rope

Coad due to acceleration, Wa

Hmpact load during Starting, Wst

2$%5-45

B-4$

%-.653-$3*(+%%%

g

a6w*(W

=

+=

+=

2A%3A-5A53-$3(+%%%6+

w*(W6

=

+=

+= 2

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Design of wire rope

FIectie load on the rope

during normal condition

')S (2ormal start up*

2AB4%

+BA53-$3+%%%

WwW b

=

++=

++=

systeof+(')S5-+

AB4%

$1%%%

load0ctual

loadDesign

>=

=

=

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Design of wire rope

FIectie load on the rope

during startup condition

')S (start up*

23%$1-5A

+BA-

WW bst

=

+=

+=

344074

systeof+(')S+-+4

3%$1-5A

$1%%%

load0ctual

loadDesign

>=

=

=

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Design of wire rope

FIectie load on the rope

during acceleration

')S ( During acceleration*

2.%45-$3

53-$+%%%+BA+

wWWW ba

=

+++=

+++=

104

systeof+(')S-

.%45-$3

$1%%%

load0ctual

loadDesign

>=

=

=

153

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Design of Pulley

Min recommended diameter of the pulley =5% 6d

= 5% 64

=+A% mm(where d is the nominal diameter of the rope*

Selected diameter of the pulley =5.% mm

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Design of Pulley

Dimensions of thesheae rim a = +-3 6 d = +$-1 mm

b = +-$ 6 d = $1-4 mm

c = %-A 6 d = 5-+ mmh = $-1 6 d = $+-4 mm

l = %-3. 6 d = 1 mm

r = %-.5 6 d = A-+A mm

r$= $-$ 6 d = 4-4 mm