Slack
Belt Design for more stable accuracy
Low belt tension means better more stable accuracy. The
Thayer weigh belt is driven from the head pulley located
at the outlet end of the feeder, rather than the tail pulley
located at the inlet end, as in competing designs. This
permits lower belt tension during operation for better sensitivity
and more stable accuracy. The head pulley is crowned to
prevent belt tracking problems and in sheathed in rubber
lagging to prevent belt slippage.
Speed Sensor mounted at idling tail
pulley
Measures the true speed of the belt via rotation of the
idling pulley, not an inferred belt speed based on motor
speed. Belt slippage or breakage is immediately detected
because the idling pulley stops rotating.
Scale
outside material handling area
An idler supporting the belt (the "weigh" idler)
transmits the load to the scale, which is located outside
the weigh belt enclosure. This design has several benefits.
The scale is not prone to damage, is out of the way for
cleaning, and is not subject to tare build-up since material
cannot fall onto the scale.
High
Accuracy, rugged measurement system
100% of the scale's capacity is used to weigh material.
Dead weight of the weigh idler and belt is mass-counterbalanced,
thus providing excellent resolution and a high signal to
noise ratio. Thayer Scale's rugged load cell design assures
reliable and accurate performance for the life of the weigh
feeder.
Automatic Test Weight Calibration
Thayer Scale's optional automatic test weight mechanism
provides the means for applying a precision test weight
to allow completely automatic calibration. The calibration
sequence can be initiated via the weigh belt instrument
keypad or via a contact closure. The need for test chains
is eliminated.
Full length adjustable skirt
boards
Tapered and flared from the inlet to the discharge to prevent
pinching of material between the skirt and the belt. The
skirt boards are located inside the belt flanges to provide
two barriers to contain material and prevent spillage.
Inlet dimensions custom tailored
and computer selected
Ensures uniform withdraw of material from storage. Very
careful consideration is given to density, particle size
and handling characteristics of your material.
Screw adjustable idler alignment
The idlers adjacent to the weigh idler are mounted on jacks
for easy alignment in the field. All idlers are mounted
on individual CEMA brackets, permitting removal to either
side without major framework disassembly or belt removal.
