Models MD & MDL Weigh Belt Feeder

Model "MD" Weigh Belt

Model "MDL" Weigh Belt

Thayer Scale's Models MD and MDL Weigh Belts are widely recognized mainline industrial continuous weigh belt feeders. They can be used with an open loop belt drive to gravimetrically totalize and measure the flow of material, or with closed control as a feeder and regulate the flow to a constant or varying set point.

The Model MDL bridges the gap between standard low capacity and high capacity weigh feeders. Some materials are too abrasive for standard low capacity feeders, lump sizes can be too large or flow rates slightly exceed specified limits, resulting in low accuracy and constant maintenance problems. These applications often can't be reliably handled by larger, high capacity weigh feeders because the relatively low flow rates fall below specified limits. (for example: feeding 1.5 lumps of coal @ 2 STPH). The Model MDL is as ruggedly built as our capacity weigh feeders, to withstand abrasive materials, but is designed to operate at flow rates just beyond the limits of our low capacity feeders.

The Model MD is an extremely rugged weigh feeder that was originally designed for the harsh environment of the cement industry but can be used in a wide variety of applications. The Model MD is the ideal weigh feeder when medium to high feed rates are required, handling high bulk density and small through large particle size materials. The Model MD can be subjected to extreme environmental conditions such as abrasive dusts, corrosive fumes, wide temperature fluctuations and vibrations-without any detrimental effects on performance or ac-

Unlike conventional weight sensing systems wherein the weigh idler is directly coupled to a series of load cells, the Model MD and MDL weigh belts incorporate a unique Force Measurement Suspension System (FMSS) interposed between the weigh idler and a single load transducer. The FMSS is a NET weighing system that counter-balances dead load so that the entire range of the load transducer is available for weighing the material. The FMSS also prevents erroneous horizontal force vectors from being interpreted as changes in weight for unsurpassed resolution and weight measurement repeatability.

When connected to the THAYER family of instrumentation, the MD and MDL Weigh Belts can be consistently and accurately calibrated and the measurements can be presented to operators and supervisory controls in a variety of data handling methods.

The instrumentation can control the flow of material as a master feeder or as a slave proportioning its feed rate to some other master signal.

ADVANTAGES

• Long term accuracy and repeatability wi th low cost of ownership.
• Load transducer located external to the material flow channel.
• Weigh bridge is insensitive to the accumulation of weight that accompanies tare build-up.
• Heavy duty, welded boxed frame construction easily accommodates legs and dust removal/scavenger systems as well as length and incline variation without significant changes in configuration.
• Can be easily and economically adapted to support future capacity needs.

Feed Rate: 2-400 tons/hr Particle Sizes: Fines up to 4 Densities: 40-200 lbs/ft3

See Literature Section for Brochure