Given that the technique of mechanization of grain harvesting has advanced a lot in time globally, the most important aspect to be addressed relates to the choice of optimal operating regimes that allow productivity and quality increases and cost reduction of mechanized harvesting. For this reason, a major aspect studied refers to the current state of agricultural grain harvesters. The analysis of specialized bibliographic sources reveals concerns in scientific research to improve self-propelled grain harvesters in order to bring them to the level of ever-increasing requirements on the qualitative and quantitative aspects of their working process. From the point of view of threshing, two variants of self-propelled combines for grain harvesting are distinguished: combines with tangential thresher (conventional combines) and combines with axial thresher (axial flow combines). For the proper functioning of self-propelled combines during work and for the reduction of grain losses, a series of technological adjustments is required. These adjustments are done before starting working and during the work, both in header and thresher. In order to highlight the importance of the study and to make it effective in the paper, a detailed documentation of the last types of threshers and cleaning systems is made below, taking into account that the productivity of the combines depends largely on the threshing flow and the separation capacity of the cleaning system. The study focuses on current upgrades in the construction of grain harvesters, which are fundamentally different from those previously manufactured.

grain harvesters, productivity, quality, mechanized

field crops and pastures

Presentation: None