This is best speed to move objects
from one place to another.
A person can walk about 4 miles per hour. If
they were carrying a box they would walk much slower. Conveyors move
boxes at about the same speed as a person carrying them. This is about
65 feet per minute (or about 3/4 of a mile per hour).
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A.
The drive pulley is larger
in the center than the ends. This helps keep the belt in the
center. This is called a "Crown".
B. The drive pulley is
completely covered with vulcanized rubber. It is called "lagging".
This keeps the pulley from slipping under the
belt. |
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SO A DRIVE PULLEY "PULLS" THE
BELT.
NOTE: If the belt movement
were reversed, the pulley would be pushing the belt. When the conveyor
was fully loaded or when the belt stretched, the pulley could turn and
not move the belt.
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The Snub Idler is closer to the
drive pulley.
It makes the belt hug more of the drive pulley
surface.
The Snub Idler is ADJUSTABLE.
It is ADJUSTABLE
ON BOTH SIDES of the conveyor. (Each side of snub idler can be
adjusted independently).
Reason - The Snub Idler is used to steer the
belt.
-
When belt runs forward and if it moves
toward side "A" - move return idler nearest tail pulley on side "Y"
toward "B". If belt moves toward side "B" - move return idler on side
"X" toward "A".
-
When belt runs in reverse and if it moves
toward side "A" - move snub idler on side "X" toward "A". If belt moves
toward side "B" - move snub idler on side "Y" toward "B".
IMPORTANT: Move snub idler
or return idler only 1/16 in. at a time. Then wait a few minutes to see
if belt moves back to center. Only small adjustments are usually
necessary.
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POWER FEEDER (Used with incline Belt
Conveyors)
A.
When boxes move from
gravity conveyor to inclined belt conveyor, the box usually stops or
"hangs up". The box will not transfer.
B.
With a Power Feeder, transfer of
the box is positive.
The Power Feeder is driven from main conveyor
by a short chain connection.
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CENTER DRIVE (Used with Horizontal Belt
Conveyors)
A.
When belt movement is
REVERSIBLE (on conveyors 40 ft. long or more)
B.
When overall length of conveyor
cannot change (belt take up by tail pulley increases conveyor
length)
A center drive should be used because:
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When heavy total loads must be
moved, it is best to use a conveyor bed with rollers (instead of regular
conveyor bed).
This is a Roller Bed belt
conveyor
Heavy total loads can be moved without using
large motors when a ROLLER BED belt conveyor is used.
Belt conveyors are often used with
Gravity conveyors.
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