Theoretical Study of Sifting Heap on Finger Chaffer Sieve

摘要

The basic way of harvesting grain crops is combining where the main role belongs to the combine harvester. One of the most important combine harvester cleaning systems is air and screen cleaning. Despite carried out researches, the world practice has not made essential changes in the classical scheme of air-sieve cleaning. Considering the design of traditional and non-traditional cleanings, it is necessary to note that improving the quality of grain separation, in modern manufacturers, is achieved mainly by increasing the area of cleanings, which leads to an increase in metal consumption. It is possible to raise the efficiency of the separation process technology in air-sieve cleaning, due to its better organization on the finger chaffer on the sieve. The significant disadvantages of the currently used finger chaffer are the low quality of the separation process technology, owing to its low organization, as well as the complexity of the design. This leads to the need for carrying out research and the creating of a finger chaffer, which increases the efficiency of the separation process technology. The article shows a theoretical justification of the design parameters of the finger chaffer, providing a better organization of the heap separation. The design of the original finger chaffer is justified. The results of a theoretical study of the dynamics process of moving components of a heap during sieving on the original finger chaffer are presented. The numerical values of the design parameters of the original chaffer are determined.