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

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

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

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