Abstract
This paper takes a local drum-type corn thresher as an example. In order to make the threshing principle transform to the plate-tooth type, the width of the spike-tooth threshing component is increased gradually, and three threshing components of different shape and size are selected as the research objects. Based on the preliminary experimental research, the corn threshing process is simulation analyzed using the self-developed corn threshing process analysis software. The effects of the width of the threshing component on the corn ears threshing rate and kernel damage rate under different rates of drum rotation were studied from a macroscopic perspective. The results show that with the increase of drum rotation rate, both the corn ear threshing rate and kernel damage rate increase; with the increase of threshing component width, the threshing rate increases and the damage rate decreases; and when the component width is too large, the stacking between adjacent components has an impact on the threshing performance. The effects of threshing component width on the amount of kernel threshing and the total compressive force during the simulation time were investigated from microscopic perspective at different rates of drum rotation, and the results show that the microscopic analysis is consistent with the macroscopic analysis. Therefore, the optimization of the structural parameters and operating parameters of the threshing component was achieved. When the width of the threshing component was 25 mm and the roller speed was 187.50 rpm, the threshing performance was optimal, with a 98.04% corn ears threshing rate and a 2.56% kernel damage rate. This paper verifies the practical applicability of the corn threshing process analysis software and provides a reference for the optimal design of threshing devices.
Highlights
By revealing the law of influence of the core parameters of corn threshing elements on the kernel threshing and damage rates [1,2], it becomes a prerequisite and key to improve the quality of corn threshing operations [3,4]
The analysis shows that the kernel damage rate gradually increases with the increase of drum rotation rate, which was consistent with the research in literature such as [1,4,8,10]
We used a self-developed discrete element analysis software to simulate the force on the kernels during the kernel threshing process in order to improve the quality of corn kernels
Summary
By revealing the law of influence of the core parameters of corn threshing elements on the kernel threshing and damage rates [1,2], it becomes a prerequisite and key to improve the quality of corn threshing operations [3,4]. The core parameters of the threshing element are the contact width and the rotational speed [8,9], respectively, both of which determine the kinetic state of the corn kernels during threshing [10,11]. How to achieve accurate observation and analysis of the kinetic state of the corn kernel population during the threshing process is the central difficulty in the optimal design of corn threshing element parameters [12]. Researchers commonly use empirical, experimental and analytical methods to study the kinetic state of corn kernels [13,14]
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