Testing separation chamber of pneumatic system in fractional grain pre-treatment machine
2020
Glushkov, A., Federal Agricultural Research Centre of the North-East named after N.V. Rudnitsky, Kirov (Russian Federation) | Burkov, A., Federal Agricultural Research Centre of the North-East named after N.V. Rudnitsky, Kirov (Russian Federation)
The paper analyses the separation of heaps in the separation chamber of the pneumatic system in a fractional grain pre-treatment machine. The finding is that the components of feed grain may reach the sedimentation chamber. A reflective partition must be in place to fully capture them in the separation chamber. The paper analyses the estimated trajectories of grain particles of various grains to optimally position the front edge of this partition. The ʻSelmaʼ feed oats are found to be moving the closest to the outer wall, which is why their trajectories define where the front edge of the reflective partition must be. When placing the front edge of the reflective partition at 0.25 m off the outer wall of the pneumatic system, the vertical set point is 0.515 m. To confirm the theoretical findings, the research team conducted experiments to find out the exact vertical and depth wise distribution of grain components in the separation chamber. The experiments used a laboratory bench version of the pneumatic system like those used in grain pre-treatment machines. For experiments, the team prepared a grain mix that comprised ʻAbavaʼ barley grains (50 % large-particle grains, 45 % small-particle grain) + 5 % of light impurities. The experiments showed that to prevent the grain from infiltrating in the dust exhaust located between the reflective partition and the outer wall, the front edge of the partition must be set at 0.47 to 0.55 m vertically, 0.25...0.30 m off the outer wall, which confirms the estimates.
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