CALCULATION OF DESIGN AND FORCE PARAMETERS OF GRAVITY-CASCADE SEPARATOR

Different types of separators are used to separate seed mass in agriculture. Seed separation is mainly carried out according to the physic and mechanical and aerodynamic properties of seed mass. Separators of gravity type are promising designs of seed separators. Energy is not used for the seed separation process in this type of separators, but energy is used for dosing and loading of seed mass. The design of the gravity-cascade separator of scissor type is proposed in the article. For seed separation, separation sections of gravity separator must be installed at a given tilt angle. The tilt angle of separation section depends on the physical and mechanical properties of the seed mass. The transmission screw-nut is proposed to install the separation sections of gravity-cascade separator in a given position. The scissor-type separator is a new type of separators, so the theoretical studies have been conducted to obtain its design and force parameters. The design of the proposed gravity-cascade separator belongs to scissor-type frame structure. To eliminate the possibility of unauthorized movement of the separator rollers, it is necessary to calculate the holding force. As a result of theoretical studies, the dependence between the screw-nut transmission parameters and the gravity-cascade separator parameters was obtained in the article. In addition, the dependence which allows us to determine the holding force of the separator sections in a given position was obtained by using the principle of virtual displacements. The weights of the separator, and seeds in the hopper and on the working surfaces of the gravity-cascade separator, and the sieve tilt angle were taken into account in the obtained dependence to determine holding force.