Theoretical justification of the parameters of a dispenser with a cylindrical working body

The work is devoted to the theoretical substantiation of the parameters of a continuous volumetric dispenser with a cylindrical working body and the identification of significant factors that affect its design and technological parameters. The study of the problem is based on the method of "viscous flows", in which, in the first approximation, the movement of the material is taken as the flow of a viscoplastic medium. So there has been employed an approach to solving a hydrodynamic problem with similar limiting conditions. There has been revealed that the velocity of particles in a rolling layer determines the axial velocity of material movement in a rotating cylinder. Analytical equations are obtained that describe the motion of the material in the plane of rotation of the cylinder. It is the angle of inclination of the cylindrical working body that plays an important role in the formation of the longitudinal section of the material in the cylinder, increasing the productivity and accuracy of the dispenser. The optimal angle of inclination of the cylindrical working body for transporting bulk material should be from 15 to 30°. It is found that the main factors that affect the performance of a continuous dispenser with a cylindrical working body are: the physical and mechanical properties of the material being dispensed, as well as the design parameters of the dispenser (cylinder length, diameter and angle of inclination) and operating modes (cylinder rotation frequency and kinematic mode coefficient). It is determined that with an increase in the kinematic mode coefficient of more than 0,5, the productivity of the dispenser increases slightly. The operating mode of the dispenser is theoretically justified (especially for microdosing at a capacity of up to 400 kg/h): the kinematic mode coefficient should be in the range from 0 to 0,4; the rotation speed of the working cylinder up to 100 rpm; the cylinder diameter up to 0,08 m; the angle of inclination of the working cylinder 10-20°; the thickness of the rolling layer should be 0,021-0,022 m.