Investigation of the Effectiveness of the Screening Process on a Vibrating Screen With a Composite Construction of a Trellis Sieve

Screens based on the principle of the vibrating effect of the sifting surface on the processed material provide the re-quired separation efficiency and high productivity, which makes them indispensable in various industries, including mining, building materials and many others. The main directions of improvement of vibrating screens are considered. The advantages of trellis sieves of various designs and their disadvantages are shown, indicating the need to find solutions to improve the quality of the screening product produced on them. The description of the developed compo-site structure of the trellis sieve and the predominant features of the implemented two-stage process of separation of material particles by size due to its design are given. The expediency of conducting experimental studies aimed at in-vestigating the screening process of dry bulk materials in a vibrating screen with a trellis screen of the developed de-sign, which allows effectively separating "obstructing" particles, is substantiated. In the Altair EDEM software prod-uct, simulation modeling of the screening process using the method of mathematical planning of the experiment was carried out on models of the composite structure of a trellis sieve and its prototype. For the composite structure of a trellis sieve, a regression dependence of the efficiency of the screening process on the amplitude of the sieve vibra-tions, the width of the slots of the first screening surface and the mass of the supplied material was obtained, and its study was performed. The influence of the considered factors on the values of the function is established, their ration-al values are determined. A comparison of the screening efficiency indicators of the developed design of a trellis sieve with its prototype is carried out.