Theoretical background for the development of stationary process of grain mass threshing with a combine harvester

Abstract

The article considers the issue that further improvement of the grain combine design with the classical threshing-separating device is possible due to the development of its technological scheme based on the principle of modular construction and stationary process of threshing grain mass. To achieve this goal, the problems were solved, by which laws were revealed and a mathematical description of the technological process of the combine harvester was given, as well as patterns characterizing the effect of straw on the process of grain mass threshing were revealed. In the course of research and evaluation of the effectiveness of the combine harvester’s usage the basic laws characterizing the technological process of combine harvester with the classical threshing-separating device are established. The change of the working speed of the combine depends on the technological properties of grain crops. It is revealed that the coefficient of solomitol grain mass δс is possible to reduce during combining grain crops through the application of high-cut stems. It was found that with the increase in the height of the cut of the stems (wheat) from 0.10 to 0.20 m, the coefficient of straw content of the grain mass decreases from 0.726 to 0.578. The additional material of experimental studies to determine the coefficient of straw content of the grain mass δc depending on the diameter and length of the pinned part of the stem is presented. When harvesting grain crops by the method of combing, a grain-bearing mass is formed, which is characterized by a random ratio of the fractions of the straw of the stalk of the annular part. The chaotic structure of plant parts temosolomida mass poses new challenges to supply it in the threshing-machine combine harvester with a classic threshingseparating device.