Транспортування частинки горизонтальним шнеком, обмеженим співвісним нерухомим циліндром

Abstract

The article deals with the transportation of process material with a horizontal auger on the example of a single particle. The auger is the surface of a screw conoid or straight closed helicoid. The auger rotates about its axis inside a fixed coaxial cylindrical casing. The particle simultaneously contacts the movable and fixed surfaces. The common line of these surfaces, along which the particle is forced to move during the rotation of the auger, is a screw line - the outer edge of the auger. The article assumes that the particle is on this line all the time. The screw line rotates with the auger, and the particle slides simultaneously on it and on the cylindrical casing, i.e. makes a complex movement. The sum of the relative motion of the particle (sliding along the screw line) and the rotational motion of the screw line give an absolute trajectory. The parametric equations of the absolute trajectory in the function of time in which the law of slip of a particle along a screw line is unknown are provides. Sequential differentiation found the speed and acceleration of absolute motion. The direction of the applied forces, to which the weight of the particle, the reaction of the surfaces of the auger and the cylindrical casing, the forces of friction of the particle when sliding on these surfaces, are found. A system of differential equations is developed, which is solved by numerous methods. It is shown that the absolute trajectory of movement of a particle after stabilization of motion is a rectilinear creature of the cylinder, which is located higher than its lowest one. The influence of friction coefficients and design parameters of the limiting cylinder and auger on the absolute trajectory of particle displacement is investigated. Absolute trajectories of particle motion in function of time are constructed. After the transition period, the motion of the particle with constant kinematic parameters comes to stabilize. In this case, analytical expressions were found to determine these parameters. It is shown that in the case of a perfectly smooth surface of the cylindrical casing, the particle will move along its lowest rectilinear creature. Absolute trajectories of the particle for different coefficients of friction along the surface of the cylindrical casing the casing are constructed. It is shown that as the coefficient of friction increases, the height of this trajectory also increases.