DETERMINATION OF THE QUANTITY OF MOVEABLE MATERIAL BY THE SCREW DISPENSER IN BRAKING MODE

Abstract

Screw conveyors have found application in the food, processing and chemical industries. Depending on the characteristics of the transported raw materials, conveyors of various designs are used. Due to a number of advantages in the production of dry bulk feed mixtures for farm animals, it is rational to use horizontal screw dispensers of a closed type driven by asynchronous electric motors. To increase the life of asynchronous motors, their operating mode provides for smooth braking, which affects the accuracy of dosing feed components. In this regard, the purpose of the research was formulated – to determine the influence of the structural and technological parameters of screw dispensers on the amount of material to be moved during the braking of the screw. Calculations were performed for a standard DSh-60 auger using well-known laws of mechanics. When considering the calculation scheme, it was revealed that in the screw braking mode, the mass of the dosed materials is influenced by the material supply and the screw rotation frequency. The permissible ranges of the screw rotation frequency have been experimentally established when it changes in the braking mode, which are in the range from 94.8 min-1 to 18.7 min-1. As a result of the calculations carried out, it was revealed that as the screw rotation frequency increases in the specified range, the amount of material moved by it increases by 3.7 times. The lowest feed value for the screw in question is set, which is 0.8 kg/min (at = 18.7 min-1), and the minimum mass moved by the DSh-60 screw in braking mode is 19 g. Calculated values of the mass of the dosed component can be entered into the screw control program to adjust the dosing accuracy.