Analysis of the dynamic forces acting on a vibrating screen and its support structure using a scale model

Abstract

Vibrating screens are equipment used in various industries, such as mining, steel and food. Although it is simple to install vibratory equipment on a support structure, it is necessary to consider the static and dynamic forces caused by vibration. The present work aims to perform a dynamic analysis of a vibrating screen and measure the dynamic forces transmitted to its metallic support structure, by means of the acceleration g collected. For this, a model of a prototype vibrating screen was created to perform vibration tests, the data were collected on the equipment using accelerometers positioned at strategic points through magnetic devices. In this way, the values obtained by the instrumentation were compared with the theoretical data obtained through a proposed analytical calculation. Analysing the vibrating screen, graphs were made to compare the displacements, resulting in minimal differences between the experimental and analytical data. Specially for this model, the results show that between 1100 rpm and 1400 rpm is the best frequency to obtain results in terms of efficiency and sieving, with less impact on the equipment and its structure. Analysing the forces transmitted from the vibrating screen to its structure, the analytical and experimental values were quite different, mainly at higher frequencies.