Abstract
Corn ear feed rate variations in the threshing-separation unit of a combine harvester have a significant impact on the dynamic indicators of the threshing process. In this study, we conducted experiments using a stationary tangential threshing device and measured the forces acting on the rear part of the concave as well as the torque of the rotating cylinder during a threshing process. The ThreshLab software was developed for this purpose. We found that increasing the corn ear feed rate made the threshing process more even, due to decreasing the fluctuation of forces acting on the rear part of the concave and torque of the rotating cylinder. The corn ear threshing process may be more stable if the threshing cylinder is fitted with filler plates (FP-II). A comparison of the results obtained for variations in the forces acting on the rear part of the concave with those obtained for variations in the total torque of resistance and the speed of the threshing cylinder revealed a linear correlation between these parameters at varied feed rates.
 DOI: http://dx.doi.org/10.5755/j01.mech.24.4.20721
Highlights
Combine harvesters thresh grains by passing the crops between a rotating cylinder and a stationary concave of a threshing unit [1]
It is obvious that at a corn ear feed rate of 6 kg s−1, there is no significant difference between the individual repetitions
This is true for corn ear flow threshing at a feed rate of 12 kg s−1 (Fig. 3)
Summary
Combine harvesters thresh grains by passing the crops between a rotating cylinder and a stationary concave of a threshing unit [1]. The feed rate of the crop material being inserted into the threshing unit of a combine harvester is highly variable [14], which is influenced by operator selections (such as ground speed) and feed variations due to changes in the crop density and the presence of weeds [7]. This variable feed rate presents a problem for the harvesting machine settings [15] as well as for the component life of concaves and other threshing devices [2]
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