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To
meet the need of larger screens requiring greater bearing capacities,
heavy-duty Symons Shaft Assemblies are utilized. Larger units incorporate
several important design improvements to provide heavy-duty long
life service.
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A
heavy center section of the shaft with integral counterbalance virtually
eliminates shaft deflection and assures perfect alignment between
the drive bearing housings. This allows the use of a straight roller
bearing on one end, eliminating any possible end thrust on the drive
bearings. The outer boxes are also held in positive alignment and
use spherical bearings at both ends.
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All
of the heavy duty Shaft Assemblies have greater clearances on the
escape side of the bearing housings to allow for easy discharge
of any excess amount of grease. This eliminates any heat buildup
from an oversupply of grease.
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Bolted
solidly to the balance deck and is flexibly connected to the screening
deck by four drive springs, which translate the rotary eccentric
action to the shaft to a positive reciprocating action to the screening
deck, without the use of reciprocating bearings. Since the motion
of the screening deck is opposed to that of the balance deck, very
little vibration is transmitted to the base.
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There
is easy access to the main box bolts. The outer (main) boxes, as
well as the inner (drive) boxes, are held in positive alignment.
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