Constant angle line of distributing seeds and fertilisers by a horizontal centrifugal machine

Abstract

The article presents the results of research on the distribution of mineral fertilisers and seeds by centrifugal spreaders on the field surface. A uniform distribution of seeds and mineral fertilisers by centrifugal spreaders depends on a variation of such parameters as mathematical expectation of a throwing angle and its standard deviation. The purpose of the research presented in the article is to check the reliability of the results of calculating the throwing angle of a centrifugal spreader by different methods in the Mathcad programme. The article considers the equation of particle motion on the blade of a centrifugal disc in order to determine the throwing angle of particles after coming off the blade. On the basis of this equation in the Mathcad programme, calculations of the throwing angle of the centrifugal distributor are made in three ways. The first two methods of calculation involve the use of the simplified formula of M.G. Doganovsky and V.V. Ryadnykh, obtained by solving the differential equation of particle motion along the blades of the centrifugal disc by discarding the exponent with a negative exponent. The third method of calculation is performed without simplifications and is taken by us as a reference. The results of comparative analysis of the used methods of calculation are given and the assumption about the violation of symmetry of the sieving sector with the increase in the seeding rate is put forward.