design data_bucket elevators
DESCRIPTION
Bucket elevatorsTRANSCRIPT
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9.22 DESIGN DATA-PSGT
DENSITY & ANGLE OF REPOSE OF COMMONLY CONVEYED MATER1AI5
Recommendedmax. angle of belt Density
Material to horiz, deg. tonne/m'6
anthracite, fine, dry 0.8 - 0.95 45
gypsum, small lump 1.2 - 1.4 40
Clay, dry , lump 1.0 - 1.5 SO
gravel 12 1.5 - 1.9 45
earth, dry 1.2 45
foundrysand (shake out) 24-26 1.25 - 1.3 45
ash, dry 23 0.4 - 0.6 SO
lime stone, lump 20 1.2- 1.5 45
Coke 17 0.36 - 0.53 SO
Wheat flour 23 0.45 - 0.66 55
Oat 18 0.4 - 0.5 35
saw dust 27 0.16 - 0.32 39
dry sand 18 1.4 - 1.65 4\
Wheat 18 0.65 - 0.83 3\
iron ore 18-25 2.1 - 2.5 SO
peat, dry lump 18 0.33 - 0.41 45
Coal (from mine) 18 0.65 - 0.78 SO
dry cement 20 1.0 - 1.3 SO
slag, anthracite 22 0.6 - 0.9 4S
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DESIGN OF BUCKET ELEVATORS./
Equation Nomenclature
i. Qa = -3.6 vp~-
A""a",.." m
Sm.." = 1.15 H (q+K1q.)
Qq = 3.6 v
Power on the drive shaft:
QHN = 367 (l.lS+K.Kav)
DESIGN DATA-PSG TECH
io Capacity of each bucket, litre
a, pitch of bucket, m== (2.5 to 3) h
h, height of bucket at the belt or chain end, m
v, belt or chain velocity, m/s
p, bulk density of conveyed material, tonne/cll.rn
..y, bucket loading efficiency, table. I, p. 9.24
0, capacity of elevator, tonne/hr
i; , values from table 2. p. 9.24
A, projection of bucket from belt face, mm
a",,,,, dimension of the largest lump of material conveyed, mm
m, = 2 to 2.5 if 20% of material is of size ilm""
=4.25 to 4.75 if 50 to 100% of the material is of size am""
SIIIU, max. static tension in the belt, kgf.
H, ht to which the load is elevated, m
q, wI. of load/ metre of elevator, kgf/m
Klo factor of resistance, see table 3, p. 9.25
qQ' wI. per meter of belt or chain with buckets, kgf/m
== K2 Q (For K2 see table 3)
N, power, kw
Ka, factor, see table 3, p. 9.2)
9.23
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PARAMETERS OF BUCKET ELEVATORSv
Table I.
Range of Speed, v, mls
belt chain
D, d'C'ep; V, Vec; Sh, Sh:lIlow.
~.24 DESIGN DATA-PSG TECH
Typical loads Type of Type of Loadingelevator bucket efficiency,
'¥
Coal dust slow speed gravity D 0.85d is.:harge
Cement, chalk, high speed centrifugal D 0.75fert ilizer dis.:harge
Saw dust, dry clay D 0.7-0.8in lumps, coal
Gravel, ore, slag. .Iow speed directed gr." ity V 0.7-0.85discharge
Sand, ash, earth, high speed centrifugal D 0.7-0.8rock discharge
Moist chemicals, high speed centrifugal Sh 0.4-0.6wet sand &c., dis.:harge
- .. '- slow speed gravity discharge Sh -..-
0.6-0.8
I}5-1.8-
1.25-2 1.25-1.6
0.8-1 0.8-1
1.6-1.8 -
1.25-1.8 1.25-1.6
0.6-0.8
SELECTlO OF BUCKETS: based on ioa
Table 2.
Deep buckets Shallow buckets V bucketsbucket
. io io 10 .1 io width, Ba a .. mmI/m litre -
2.5 0.75 - - - - 135
3.67 J.I 2.17 0.65 9.4 1.5 160
6.67 2.0 3.67 1 1 - - 200
8 3.2 6.5 2.6 18.0 3.6 250
15.6 7.8 14.0 7.0 31.2 7.8 350
24.2 R5 25.0 15.0 50.0 16.0 450
85.0 34 600
134 67 750
206 130 900
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j
D,sh v
T~bJi':3;FACTORS...
Conveyingcapacity
Qtonne/hr
~Belt Do"bl" .cb;\iQ
D,sh
~
DESIGN DATA-PSG TECH 9.25
Kit Kit Ka-Elevator type
Single Chain
Type of buckets.
D,sh .y-K.
upto 10 0.6 - 1.1
10to 25 '0.5 - 0.8 1.1 1.2.'
l5 to 50 0.45 ' 0.6 0.6 0.85 .1
50to 100 0.4 0.55 . 0.5 0.7 (). 1.1
Over100 0.35 0.5 - - 0.6 1),9
KI 2.5 2 1.5 1.25 1.5 I.2S
Ka 1.6 1.1 1.3 0.8 1.3 O.X
fi DIMENSIONS & CAPACITY OF BUCKETS Tolble 4..f
j
BUCKET
Type width height capacitySlandard pih:h. a. 111111-
of B h iobucItct , mtn mm litre bucket o:hain
I,
deep 135-400 100-240 0.75-14.5300, 400. l 100, 115,
shaDow 160-450 100-285 (1.65-15 500, 600 J 160, 100.
Vee 160-%0 155-620 1.5-130 160, 200, 250. 250, .\1S..,315, 400, 500, 400, 500,630: 630