Behaviour of Grain Separation in Thai Transverse Axial Threshing Units for Chainat 1 Rice Variety
A transverse axial threshing unit is widely used in self-propelled combine harvesters in Thailand and the ASEAN region. The grain separating behaviour of this threshing unit affects the performance of the threshing unit and cleaning unit. This study aims to find out the behaviour of grain separation in a Thai transverse axial flow threshing unit. The concave rod clearance was chosen as the test medium, as this significantly affects the behaviour of grain separation and Chainat 1 rice variety was chosen for test. The results show that 70 - 80% of grain were separated from the straw, and then fell through the lower concave of the feeding zone into the cleaning unit; whilst the rest were threshed in the separation zone. The purity of grain input into the cleaning unit was quite steady in the feeding zone, although the grain purity in the separation zone decreased as the length of the separation zone increased. The cumulative straws increased linearly during the feeding zone, as they increased exponentially in the separation zone. In contrast, the cumulative undeveloped kernels and other contaminants increased linearly when the length of the separation zone also increased.
Authors who publish with Engineering Journal agree to transfer all copyright rights in and to the above work to the Engineering Journal (EJ)'s Editorial Board so that EJ's Editorial Board shall have the right to publish the work for nonprofit use in any media or form. In return, authors retain: (1) all proprietary rights other than copyright; (2) re-use of all or part of the above paper in their other work; (3) right to reproduce or authorize others to reproduce the above paper for authors' personal use or for company use if the source and EJ's copyright notice is indicated, and if the reproduction is not made for the purpose of sale.