MODELING OF MOVEMENT OF DESIGN ELEMENTS OF SCISSOR-TYPE GRAIN SEPARATOR

Cleaning of grain from non-grain and grain impurities with simultaneous sorting is a mandatory technological operation, which is carried out after grain harvesting, as well as during storage and processing. Separators of various designs are used for cleaning of grain mass, but separators with flat and cylindrical sieves are the most common. Separators with flat sieves have the advantage that the entire surface of such sieves is used during separation. However, one of the disadvantages of flat sieves is the large size. Therefore, the search for design solution for the compact arrangement of flat sieves in the separator is an urgent task. Separator of scissor type is a separator with a compact arrangement of sieves, in which sieves are located on the separating sections connected crosswise. For segregation of the grain mass on the separator sieves it is necessary to oscillate the separator sieves along the vertical line. This process intensifies the grain cleaning and sorting and effectively cleaning of the sieve holes from clogging by rubber balls. Modeling of the oscillating movement of the design elements of the scissor-type grain separator using the basic provisions of theoretical mechanics allowed us to establish the motion law of the separator movable frame. The obtained equations allow us to calculate and choose rational parameters and operating regimes of the scissor-type grain separator, especially parameters of drive mechanism. Substantiating the parameters of the separator according to the simulation results, in particular the value of the stiffness of the spring supports and the angular velocity of the eccentric, it is necessary to ensure at least one complete oscillation of the movable frame of separator between its contacts with the slider, which will create favorable conditions.