Calculation of constructive and technological parameters of the centrifugal-screw mixer for dry bakery mixtures of functional purpose obtaining

Innovative and scientific activity on the creation of highly efficient equipment for the production of high-quality mixtures of functional purpose is an urgent task. One of the most labour-intensive operations in this technology is the uniform distribution of particles throughout the whole volume of mixture and homogeneous mass obtaining. To achieve this goal the algorithm for calculating of structural and technological parameters of the screw and centrifugal-screw mixer was presented in the article. In this algorithm, the authors calculated the productivity Q, the screw diameter D, and its critical rotating speed ncr, depending on the materials selected and on their physico-mechanical parameters, as well as the materials velocity along the surface of the cone, the cone diameter, the diameter and the height of the shell, and in conclusion the inhomogeneity coefficient characterizing the quality of the mixture obtained. Based on this algorithm, the computer program was developed. According to the data obtained, the program builds a dependence graph of the screw diameter on its capacity and its critical rotation speed, where the point of rational parameters of the screw work during the production of the combined mixture is displayed. The results of calculation of technological and design parameters (screw diameter 0.02 m, capacity 47.89 kg / h and critical rotational speed of the screw rotor 456.5 rpm) were presented and compared with experimental values in the computer program. As a result, we obtained an average relative error, which does not exceed 10%. So the above algorithm for calculating of the centrifugal-screw mixer can be used to predict the values of rational design and technological parameters of the mixer operation, as well as to predict the quality of the mixture obtained with it