Some suggestions to improve the threshing drum of harvesting machine in the direction of the grain threshing - separating and straw chopping to facilitate the exploitation of straw after harvest in Vietnam

Abstract

The amount of rice straw after harvesting in Vietnam is estimated to be about 46 million tons annually. Most of the straw is considered as waste product. They are burnt openly or dumped on the field and rivers. This causes the environmental  pollution and waste of the potential resource. Especially, burning rice straw after harvesting has become a serious problem at some provinces and cities. Research on improving the paddy harvesting machine in the direction of the grain threshing-separating and straw chopping was carried out in order to facilitate the exploitation of straw after harvesting. This projecthas been implemented at the faculty of Engineering, Hanoi University of Agriculture. This paper presents some main results of research on the improvement of the axial thresher for harvesting machine by adding straw chopping functions besides of the threshing function. Based on the qualitative analysis of the structure, working principle of the thresher’s parts combined the straw chopping for the common rice harvester machine in Vietnam, the authors has chosen the working principle and structural diagram of thresher – straw chopper to make the orientation for the next step of research.