water sprayer
TRANSCRIPT
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8/9/2019 Water sprayer
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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
= $%% &g
'actor of safety(')S* = +
elocity of the moing
arrangement, = %-. m/s
0cceleration of the
moing arrangement, a = %-. m/s+
Total load consider , ' = ')S # W # (g ! a*
= +%1+ 2
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8/9/2019 Water sprayer
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Selection of Geared motor
rpm+3-+4
%-5.671%6%-.
D67
1%62pulley,ofSpeed
2m5.%-5.+
%-5.6+%1+
D/+#'re8uiredTor8ue
mm5.%Dpulley,theofDiameter
=
=
=
=
=
=
=
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Selection of Geared motor
&W$-$motorSelected
W$%%$1%
5.%-56+3-+4676+
1%
T62676+Pre8uired,Power
=
=
=
=
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8/9/2019 Water sprayer
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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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8/9/2019 Water sprayer
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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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8/9/2019 Water sprayer
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Design of shaft
mm
m-
66753A-356$1
E67
T6$1shafttheofDiameter
MPa$3%Estress,shear0llowableA.9
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8/9/2019 Water sprayer
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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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8/9/2019 Water sprayer
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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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8/9/2019 Water sprayer
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Design of wire rope
+
+
+
mm+A-5+
46%-%15
d6%-540rope,theof0rea
=
=
=
253-$3646%-%515
6d6%-%515wrope,theofWeight+
+
=
=
=
16
16
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8/9/2019 Water sprayer
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Design of wire rope
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8/9/2019 Water sprayer
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Design of wire rope
Coad due to acceleration, Wa
Hmpact load during Starting, Wst
2$%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