Continuous Weighing by Multi-stage Conveyor Belt Scale

概要

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The automatic weighing of packages in motion is coming to assume greater importance. In the weighing of packages, the sequence of products is generally completely random. Long, short, heavy and light products are passed over the conveyor belt scale in any kind of random sequence. In this paper, an interesting possibility of raising throughput of the conveyor line without increasing the conveyor belt speed is offered by the use of two or three conveyor belt scales (called a multi-stage conveyor belt scale) that are arranged in the line in direct sequence to each other. Through the new measuring technique, a weighing scale can be created which will adjust the conveyor belt length to the product length. The conveyor belt scale usually has maximum capacities of less than 80kg and 140cm, and achieves weighing rates of 150 packages per minute and more. This weighing system consists of the multi-stage conveyor belt scale with load cells and the photo-electric switches which detect the product lengths and the distance between products in sequence, and the control unit with a weight indicator and a mounting frame. The experimental results on the multi-stage conveyor belt scale suggest that the algorithms proposed in this paper are effective enough to practical applications.
公益社団法人計測自動制御学会の論文