World Grain - July 2005 - 39
grainoperations
Slower belt speeds (under 500 fpm
or 2.5 m/s) tend to be used with fragile
product. When choosing belt speeds,
the following formula, used to calculate free fall velocities, may be useful:
Final velocity squared = Initial Velocity
squared + 2 * acceleration * (final position - initial position).
Using this formula, we find that a
particle dropped from rest is traveling at 8 ft/s (480 fpm) after falling
one foot.
This formula is true when acceleration is constant (as is the case with
gravity: 32.2 ft/s^2 or 9.81 m/s^2) and
neglects any drag from air resistance,
which is a reasonable approximation
at relatively low speeds and short fall
distances.
Fragile product bucket elevators
usually have a different head design
and run much slower than conventional centrifugal discharge bucket
elevators. Three different styles of
bucket elevators may be used for fragile product, depending on the severity
B
U
L
K
H
of the application.
At higher capacities, regular
centrifugal discharge legs can be
used with rpms at the low end of centrifugal discharge in conjunction with
lining the head discharge area with
cushioning material. At lower capacities, slow moving "easy-dump" legs
can be used. These legs essentially
pour the product out of the bucket and
into a conventional discharge without
throwing it at high speed.
Lastly, special chain-style legs,
which fasten the buckets to chains
rather than belts and utilize a special
head design, can be used. The head
consists of several chain sprockets, arranged to dump the bucket into a spout
exiting the side of the leg. These legs
are very gentle but rather expensive.
Drag conveyors are seldom used
on fragile products. Despite the traditional avoidance of drag conveyors,
A
N
D
L
I
N
Tramco Inc.'s
Jetbelt air supported belt conveyer.
Photo courtesy of Tramco.
it is hard to see how a seed sliding
along a smooth drag box at relatively
low speed would be worse off than the
same seed sliding down a spout, probably at higher speed.
When using drag conveyors, feed
the product far enough from the tail
that it cannot be carried back to the
tail and become crushed. Similarly,
metered flow inlets are recommended
to prevent overfeeding the drag. At
the drag discharge, install a wiper to
knock product off the chain before
it reaches the drive sprocket and becomes crushed.
The details of the spouting and tran-
G
Integral Sweep
Augers
_ ot
Permit yourself
high performance.
for flat bottomed silos
Gravity discharge up to 600 MTPH
Residual discharge from 15 to 300 MTPH
www.denis.fr
QUALITY
WITHOUT LIMIT
Circle No. 82 on the Reader Service Card or see page 82.
www.World-Grain.com / World Grain / July 2005
41
http://www.denis.fr
http://www.World-Grain.com
World Grain - July 2005
Table of Contents for the Digital Edition of World Grain - July 2005
Contents
World Grain - July 2005 - 1
World Grain - July 2005 - 2
World Grain - July 2005 - 3
World Grain - July 2005 - Contents
World Grain - July 2005 - 5
World Grain - July 2005 - 6
World Grain - July 2005 - 7
World Grain - July 2005 - 8
World Grain - July 2005 - 9
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World Grain - July 2005 - 40
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