Dynamic weighing conveyors measure the weight of the product as they pass a point on a conveyor – they can be used to show total product weight and instantaneous weight passing that point.
They consist of a set of load cells which are connected at one end to a static point and the other to some mechanical device which carries the load of the product. This could be a plate of a fixed size that then has the conveyor belt running across the top of it, or on a larger conveyor with heavier product a set of support rollers that again have the conveyor running across the top
Dynamic weighing conveyors can be used in any industry or application where weight needs to be controlled or monitored. They can be used to monitor total produced product or to control raw product feed to a production process, based on what the product recipe requires.
When considering how to design a conveyor system of this type, it’s important to consider the static load of the weighing platform and what the instantaneous load on it at maximum throughput may be to enable the correct specification of the load cell ranges.
For example, a lightweight cooked product may only need a load cell of a 2kg but a large conveyor taking coal may need something that requires a 100kg range once the weighing platform and the product have both been accounted for. This is because platform may be a 50kg load on the loadcell before product is applied but the load passing over could account for 50kg of extra weight. When setting up the system the 50kg static platform load is removed from the calculation (tare weight).
The speed of the conveyor also needs to be taken into account in the calculation. Is the conveyor fixed or variable speed? If it’s variable then this will need to be fed back in as it changes otherwise the weight values will be wrong.
The below project for 2 Sisters Food Group is a great example of how to design a conveyor system of this type.
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