Grain Systems Bucket Elevtors, Conveyors, Series II Sweeps PNEG-1204 - Manual (Page 34)

29 PNEG-1204 Enclosed Belt Conveyors
Belting Assembly
13. The basic and primary rule which must be
kept in mind when tracking a conveyor belt is
simple, “THE BELT MOVES TOWARD
THAT END OF THE ROLL/IDLER IT CON-
TACTS FIRST.”
14. The reader can demonstrate this for himself
very simply by laying a small dowel rod or
round pencil on a flat surface in a skewed
orientation. If a book is now laid across the
dowel rod and gently pushed by one’s finger
in a line directly away from the experimenter,
the book will tend to shift to the left or right
depending upon which end of that dowel rod
the moving book contacts first.
6. Tracking the belt is a process of adjusting
idlers, pulleys, and loading conditions in a
manner that will correct any tendencies of the
belt to run other than true.
7. A normal sequence of training is to start with
the top pulleys in the direction of belt travel.
Start with the belt empty. After tracking is
completed, run the belt with a full load and
recheck tracking.
8. Tracking adjustment is done while the belt is
running and should be spread over some
length of the conveyor preceding the region
of trouble. The adjustment may not be imme-
diately apparent, so permit the belt to run for
several minutes and at least three full belt
revolutions after each idler adjustment to
determine if additional “tracking” is required.
9. After adjustment, if the belt has overcor-
rected, it should be restored by moving back
the same idler, and not by shifting additional
idlers or rollers.
10. If the belt runs to one side at a particular point
or points on the conveyor structure, the cause
will probably be due to the alignment, or
leveling of the structure, or to the idlers and
pulleys immediately preceding that particular
area, or a combination of these factors.
11. If a section or sections of the belt run off at all
points along the conveyor, the cause is
possibly in the belt itself, in the belt not being
joined squarely, or in the loading of the belt.
With regard to the belt, this will be due to
camber. Its condition should improve after it
is operated under full load tension. It is a rare
occasion when a cambered belt (less than
1/2%) needs to be replaced.
12. When replacing a used belt, go through the
system and square and level all rollers, idlers,
pulleys and bed before training a new belt.
General Tracking/Training Procedures