Influence of parameters of a screw dispenser on its dosing accuracy

Abstract

BACKGROUND: Strict observance of the number of individual components in the total mass of the feed mixture is necessary in the production of compound feeds. In this aspect, the process of components dosing, performing automatically in modern conditions, has a special role. The paper considers the process of feed components dosing with a screw dispenser, which has a number of advantages over other types of dispensers when supplying bulk feed components. However, its main disadvantage is low accuracy due to the presence of a certain amount of free-falling material. The paper describes theoretical studies that help to adjust the operation of screw dispensers in further. AIMS: Defining the influence of the design features and operating mode of the dispenser, as well as the physical and mechanical properties of the feed components on the mass of the attachment. METHODS: The mathematical methods based on physical laws are used in the study. The Mathcad Prime 6.0 computer mathematics system was used for conducting the computational experiment. RESULTS: As a result of the conducted research, the dependence of the amount of the free-falling material on the height of the fall, the material supply and the velocity of the material particles hovering has been studied. At the same time, it was found that with an increase in the height of the fall, the amount of material in the fall increases exponentially. When dosing components with different physical and mechanical properties at fixed values of the material supply and the fall height, a greater number of free-falling components with a lower soaring speed are observed. CONCLUSIONS: The study is reasonable to use when weighing small appendages up to 500 g for various kinds of additives. The obtained results of the study will help to adjust the dispenser control program.