Continuous Mass Measurement in Checkweighers and Conveyor Belt Scales

摘要

This work is concerned with the development of a signal processing algorithm for Checkweighers to realize much higher speed of operation and highly accurate measurement of mass of object during crossing a conveyor belt. Continuous measurement means that masses of discrete objects on a conveyor belt are determined in sequence. Checkweighers usually have maximum capacities of less than 75 kg and achieve measuring rates of 150 packages per minute and more. The output signals from the Checkweighers are always contaminated with noises due to vibrations of the conveyor belt and the object in motion. In this paper an employed digital filter is of Finite-duration Impulse Response (FIR) type that can be designed under the consideration on the dynamics of Checkweighers. The experimental results on Checkweighers suggest that the filtering algorithm proposed in this paper is effective enough to practical applications.