process innovations, inc.
equipment for the process industries
     
Phone (315) 252-7037 Fax (315) 252-8196 Email: sales@piiny.com
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Thayer's belt scales are built smart and built to survive. They are an excellent value, easy to install, provide accurate measurements and they are easy to calibrate.

Outdoor conveyor weighing of dusty fines and “stone like” aggregate materials where rugged construction and spill-proof/jam-proof suspension design are the most essential attributes. Teaming with Thayer Scale’s proven “Rocking Flexure” fulcrums is a completely new “pipestem” single idler suspension system incorporating built-in storage means for its calibration weight (no test chains required). This combination of unique elements provides important advantages for neglected-maintenance operations where on-going dust build-up and spilled aggregates are known to foul conventional suspension designs. Applications include trough belt conveyors of 14-48” widths (Series 1RF-3A for 14”, 18”, 24”, 30”; Series 1RF-4A for 36”, 42”, 48”) operating at speeds up to 600 fpm and inclines up to 18 degrees. The “Quarry King” suspension system is fabricated from slim flat metal elements (carbon steel standard, stainless steel optional) which are precision laser cut from sheet stock and welded to, and branch outwardly from, a centrally positioned tubular “spine” shaft running axially to the conveyor run, directly under the centerline of the belting.

These elements, two of which support the weigh idler, lie in a vertical plane so as to eliminate tare build up areas. There are no structural elements running parallel to and in close proximity with the conveyor side stringers as in conventional designs to trap and hold aggregate material spilling from the edge of the belting. The suspension system is longitudinally restrained and pivoted at the in-feed (approach) end on Thayer Scale’s proprietary RF Fulcrum arrangement, while the downstream end is supported from a single NTEP certified strain gage load cell loaded in pure tension, protected from effects of all extraneous lateral forces. A key advantage is that the load cell can be quickly and easily removed and replaced without disturbing the weigh idler itself, thereby eliminating the tedious task is re-setting and aligning the idler, and conducting another material test upon re-commissioning. The non-weighed Bridge Element that supports the load cell also includes the supporting brackets for storing the Test Weight which can be easily moved to its “calibration” position on the suspension system whenever desired. Accurate belt speed measurement requires the use of a precision wheel in contact with the tension side of the belt in the area where the scale is located. The Thayer belt travel pulser assembly includes a precision cast/machined wheel with a “pre-calibrated” circumferential tolerance of ± 0.05%, has provisions to maintain constant pressure against the belt under all operating conditions, and is self-steering to avoid slip errors The “Quarry King” belt scale is available with all models of THAYER Belt Scale Integrators.

 

Superior performance in an economical package, the 2RF-4A Belt Scale is designed for inventory control and totalization. The weighbridge of this 2 idler belt scale features exclusive rocking flexure suspension in the approach configuration. Weight sensing is sensitive, deflection is low and the scale is isolated from error-inducing effects of uneven belt tracking, overloading, belt lifting, and other common conditions. Tare load is mass counterbalanced to create superior signal to noise ratio in weight sensing, orders of magnitude better than belt scale designs supporting full tare load on the load sensors.

Accurate to +/- 1/4% of design capacity or +/- 1/2% over a 3:1 range

     

Superior performance in an economical packagem, the 4RF-6A Belt Scale is designed for inventory control and totalization. The weighbridge of this 4 idler belt scale features exclusive rocking flexure suspension in the approach-retreat configuration. Weight sensing is sensitive, deflection is low and the scale is isolated from error-inducing effects of uneven belt tracking, overloading, belt lifting, and other common conditions. Tare load is mass counterbalanced to create superior signal to noise ratio in weight sensing, orders of magnitude better than belt scale designs supporting full tare load on the load sensors.

Accurate to +/- 1/8% of design capacity or +/- 1/4% over a 3:1 range

 
     

Superior performance in an economical package. The 6RF-6A Belt Scale is designed for inventory control and totalization. The weighbridge of this 6 idler belt scale features exclusive rocking flexure suspension in the approach-retreat configuration. Weight sensing is sensitive, deflection is low and the scale is isolated from error-inducing effects of uneven belt tracking, overloading, belt lifting, and other common conditions. Tare load is mass counterbalanced to create superior signal to noise ratio in weight sensing, orders of magnitude better than belt scale designs supporting full tare load on the load sensors.

Accurate to +/- 1/10% of design capacity or +/- 1/8% over a 3:1 range

     
The Thayer "FP" Belt Scales is a unique and patented weighing scale specifically designed to accurately weigh "low density" materials. It can be used in new installations or can be seamlessly integrated into an existing flat or trough idler conveyor belt conveyor.Its design has some very unique advantages: Can be either scale "over" or scale "under" design depending on available space on the conveyor belt. Flat horizontal belt or flat incline belt. Measures only vertical forces-therefore is not affected by changes in idler friction Weight sensing system is totally enclosed and requires no maintenance. Flexure Plate lever system eliminates all wearing parts (such as bearings, pivots, or bushings) and is not susceptible to vibration. Weight transducer is located out of the material handling area and is not affected by, dust, corrosion or heat produced by the material. Cantilevered suspension system permits easy removal of belt. Force aligned to totally eliminate the effects or changes in belt tension caused by head loading or belt tracking. Weight sensing lever system is a summing lever so the load (weight) is measured accurately, regardless of belt tracking or load position. Weight signal represents only the material load; the dead load (belt and idlers) is completely mass counter balanced.