ОПРЕДЕЛЕНИЕ РАБОЧИХ ПАРАМЕТРОВ ЛЕНТОЧНОГО ДРАЖИРАТОРА

Abstract

Conventional methods of seed pelleting involve using pelletizers with a drum-type working unit. In these devices, pelleting is carried out in a cyclic mode, which makes operational restrictions and complicates the use of pelletizers in the technological line of complex pre-sowing seed treatment. The authors evaluate the effectiveness of belt-type pelleting machines ensuring the continuity of pelleting and significantly increasing the performance. The paper provides some basic requirements to continuous seed pelletizing. The conditions are determined to describe the pellets rolling down the inclined surface of the moving conveyor belt. Consequently, the analytical relationship is established between the inclination angle of the pelletizer belt and the friction coefficient, the pellet diameter and speed of their forward movement along the conveyor belt. The main operating parameters of the belt pelletizer are determined – length, speed, and the inclination angle of the conveyor belt. The obtained mathematical expressions are universal, since they allow analyzing the working parameters of the pelletizers when processing crop seeds with different initial size, weight, and tribotechnical properties. When studying the movement of the coated seeds along the moving belt of the inclined conveyor, the friction force acting on them, the reaction force of the support, the authors took into account the rolling force and the gravity force. Based on the analogy of the translational movement of seeds along an inclined plane to their movement along the inner surface of the drum of an infinitely large radius, the authors established the numerical values of the parameters of continuous pelleting. The paper finishes with a conclusion about possible reducing the dimensions of the belt-type pelletizer. The estimated length of the working area of the conveyor belt is suggested to be the sum of the lengths of several belts inclined to the ground in different planes.