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WEIGHFEEDER, WEIGH FEEDER, WEIGH BELT, WEIGH BELT FEEDER
A weighfeeder weigh's bulk material while it is conveyed. An accurate rate of flow and
totalized weight measurement is received without interrupting the flow of material in a
process. A weighfeeder can also control the rate of flow of the conveyed product.
In-motion weighing requires accurate transmission of the product load to
load cell(s) or an LVDT. The resulting voltage signal corresponding to weight is transmitted to the
integrator and becomes one of the two inputs required for integration.
Unlike static weighing, in-motion weighing integration requires a second input: a pulse
signal proportional to the speed of the conveyor belt. Each belt speed sensor pulse
represents a fixed distance of belt travel.
Since the force measured by the load cell is represented as weight per unit length, it can
be multiplied by the distance of belt travel (one speed sensor pulse) to provide product
weight for that segment of the belt (lbs/ft x ft = lbs, or kg/m x m = kg).
Adding the samples provides total throughput weight of product across the scale.
Open style weighfeeder (horseshoe infeed)
Enclosed style weighfeeder
Weighfeeder's include the following components:
Belt-Meeting the specific application needs based on temperature, abrasiveness, and flow characteristics.
Speed sensor-Optical encoder style pulley shaft mounted to measure the speed of the belt.
Weigh scale-Load cell or LVDT technology that is mechanically connected to a belt support idler or pan.
Drive motor-Designed to meet the specific application needs based on belt speed and power required to convey the product.
Belt support-Idlers, pans, sliders or bars that support the belt.
Infeed-Transition hopper from feed device to weighfeeder belt.
Shear gate-Material profiling gate that sets a specific depth of material on the belt. NOTE: Horseshoe style infeeds to not require shear gates as the material is considered "wild flow".
Conveyor components-Pulleys, belt take-ups, frame, shafts etc.
Weighfeeder components
Numerous automated production processes require continuous weighing and batching. The task of weighfeeders is to measure and control the throughput quantity of the material. Weighfeeders are used in virtually every industry; Mining, aggregate, cement, food & beverage, chemical, plastics, recycling, tobacco, pharmaceutical, power generation, steel etc.
References
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