Model Low Density MXL Weigh Belt

Open Construction

Closed Construction

Sanitary, Open Construction

Designed exclusively for accurate and reliable feeding of materials with very low bulk densities such as wood flakes and fibers, snack foods, textiles and tobacco products. The MXL "Low Density" Weighbelt Feeder incorporates the following unique design features that result in high accuracy, reliable performance and stable calibration:

Unique scale design
Thayer Scale's flexure scale measures only vertical loading. Horizontal forces created by belt tension, thermal movement, etc., do not affect the weight measurement. Mass-counterbalancing negates the dead weight of the weigh idler and the belt resulting in the best possible weight signal to noise ratio. This is especially important with low density materials, where the material weight might be only a fraction of the dead weight. Thayer Scale's force sensor system can take high load-directed overloads (>1000%) without calibration shift.

Slack belt design
The weigh belt is driven from the head pulley located at the discharge end of the feeder. Rubber lagging on the pulley prevents belt slippage and the pulley is crowned to prevent belt tracking problems. The tail pulley, located at the inlet end, is an idling pulley. This configuration permits the conveyor to run at lower belt tension during operation than any other design. Low belt tension means better, more stable accuracy. Thayer Scale's "slack belt" design eliminates the need for belt tensioning devices and belt tracking switches, thus doing away with the maintenance headaches that accompany them.

Self-cleaning tail pulley
Caged design allows material to fall into a crowned core that sends material out both ends of the pulley. This type of pulley eliminates the need for an inside belt scraper.

Speed sensor mounted at idling 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 (theweigh 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 prone to tare build-up becasue material cannot fall onto the scale.

Automatic calibration
Thayer Scale's optional automatic test weight mechanism provides a means for applying a known test weight to allow completely automatic calibration. The calibration sequence can be initiated via the weigh belt instrument keypad or via a contact closure. Test weight calibration eliminates the need for test chains

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