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Spill
Edge Wear
Fig. 6
Training the Belt
Training the belt is a process of adjusting idlers, pulleys, and loading conditions in a manner
that will correct any tendency of the belt to run other than centrally. The following causes
of common belt performance are considered axiomatic.
When all portions of a belt run off
through a part of the conveyor length,
the cause is probably in the alignment or
leveling of the conveyor structures, idlers
or pulleys in that region. If one or more
portions of the belt run off at all points
along the conveyor, the cause is more
likely in the belt itself, in the joints of the
belt, or in the loading of the belt.
When
the belt is loaded off-center, the center
of gravity of the load tends to find the
center of the troughing idlers, thus
leading the belt off on its lightly loaded
edge (Fig. 6).
These basic rules can be used to
diagnose belt running ills. Combinations
of these rules sometimes produce cases
that do not appear clear-cut as to cause,
but if there are a sufficient number of
belt revolutions, the running pattern will
become clear and the cause disclosed.
The usual cases when a running pattern
does not emerge are those of erratic
running, which may be found with an
unloaded belt that does not trough well,
or a loaded belt that is not receiving its
load uniformly centered.
Effects of Off-Center Loading
7
Installation, Maintenance & Troubleshooting Guide
Installation
Table 1-2 Recommended Initial Take-Up Position*
Carcass material [WARP]
Percent available for
length increase
Percent available for
length decrease
Steel
25%
75%
Nylon, Polyester, Aramid, Fiberglass
90%
10%
*Take-up conditions and travel amounts shown in Table 1-1.