4 Idler Approach-Retreat Belt Scales

THAYER 4 Idler Belt Scale Features

Depth of suspension stringer is 6 inches to meet deflection criterion.
Mass counterbalance weights are used to counterbalance the dead load of the main frame weigh idlers and conveyor belt. The use of the mass counterbalance permits maximum utilization of the load cell.
Special pentagonal (5-sided) tubular stringers employed to meet combination needs of tensional/bending rigidity and low material build-up area.
Patented rocking-flexure primary pivot is wear-less and uniquely accommodates a distorting foundation (as is characteristic of typical conveyor structures).
Isolation lever suspended by stainless steel pre-stressed aircraft cable protects load cell from extraneous forces that arise from distorting foundation and serves to provide means to optimize load cell utilization factor.
Patented calibration method utilizing a controlled belt travel interval
makes one-shot adjustment possible.
Unique test weight system eliminates need for test chains.
Accurate belt speed measurement uses precision wheel and high resolution
pulser

Model 4RF-6AR
No. Idlers: 4
Stringer Depth: 6
Min./Max.: Belt Width: 24” to 60”
Idler Spacing: 30” to 60”
Max. Belt Loading: 525 lb/ft.
Min./Max.: Belt Speed: 10 to 1000 ft/min.
Accuracy: ± 1/8 to ± 1/4 %
Load Cell: Strain Gauge or LVDT

The THAYER 4RF-6AR Belt Scale is designed for high accuracy (1/8% typical) inventory control and totalization. The weighbridge features exclusive rocking flexure suspension in the approach-retreat configuration. Measurement sensitivity is high, deflection is low, and the load cell is isolated from the error-inducing effects of extraneous lateral forces, off-center loading, foundation distortion, inclination hold-back forces, and high sporadic shocks and overloads. 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 sensor.