ANALYSIS AND PROSPECTS OF TECHNOLOGICAL AND DESIGN FEATURES OF SOWING MACHINES

To date, sowing is one of the most urgent tasks, therefore, universal sowing equipment is widely in demand, which should ensure a uniform distribution of the number of plants per unit area to create the same conditions for development. It is the sowing machines of this type that will largely solve the problems of timely high-quality sowing with a combination of other technological operations - soil preparation, fertilization, embedding, rolling, etc. At the same time, a significant amount of technical and human resources will be released, sowing dates will be strictly observed. Accordingly, the purpose of the study was to conduct a comparative analysis and prospects for the technological and design features of sowing machines to improve the operational reliability of the mechanism for copying the relief of sowing machines using advanced structural materials. The research was carried out by the method of technological and structural analysis of technologies and machines for sowing machines. In the process of research, methods of comparison and mathematical modeling of technological processes were used. The information base of the research was the works of Ukrainian and foreign scientists on technologies and machines for sowing. On the basis of the comparative analysis and the prospect of technological and design features of sowing machines, it was found that friendly stairs (at least 90%), and, as a result, a high yield depend on the quality of the work of the parallelogram mechanism for copying sowing complexes. The reason for the violation of agricultural requirements for sowing, in particular the depth and uniformity of seed placement, is the low durability of the mechanisms for copying the soil surface. It has been established that the main reason for the low reliability of these mechanisms is the use of "steel-to-steel" tribo-couplers in their mobile joints, which ensure operability with frequent (every 40...50 hours of operation) maintenance (lubrication). It has been revealed that it is promising to introduce polymer-composite materials for structural purposes in the movable mates of the parallelogram copying mechanism, which will change the working conditions and increase the durability of this mechanism as a whole. To solve the problems associated with the development and study of the properties of new or modified PCM in the movable joints of sowing machines, it is necessary to conduct a theoretical justification and experimental feasibility of using polymer parts and their effectiveness. It is necessary to develop a model that describes the dynamics of loads under different operating conditions of the disc coulter. It is also necessary to carry out theoretical calculations that take into account the change in the load on individual nodes of the parallelogram copying mechanism.