Abstract
Grain damage research has been a focus of many experts in the agriculture machinery industry. A threshing test-bed was developed to investigate the movement and influence of different threshing and separating units on maize grains. The damage to maize grains was analyzed with a high-speed camera to observe the movement and damage received by the maize grains. The results showed that the threshing and separating effects of the perforated concave plate were obviously lower than that of the round steel concave plate, the threshing effects of the rigid rasp bar and polyurethane rasp bar were similar, and the damage ratio of the polyurethane rasp bar was relatively low. It also indicated that moisture content has a significant effect on the damage ratio and damage type of maize grains. The different threshing component types used in this study had an obvious effect on the degree of damage to high moisture content maize grains and the damage to high-moisture kernels during threshing could be further identified. The results can provide a reference for the design of threshing and separating devices in the maize combine harvesting machinery. Keywords: maize grain, damage, threshing process, high-speed camera DOI: 10.25165/j.ijabe.20201306.5395 Citation: Ma Z, Han M, Li Y M, Yu S C, Chandio F A. Comparing kernel damage of different threshing components using high-speed cameras. Int J Agric & Biol Eng, 2020; 13(6): 215–219.
Highlights
The yield and planting area of maize is the largest among the three main grain crops in China
4.1 Results and analysis of threshing process The threshing process of different threshing components was recorded with the high-speed camera system, and it was compared with observations to analyze the effects of different threshing components in the maize threshing process
The number of each threshing component varied with 15 rigid nail tooth components, 12 rigid tooth plate components, 6 rigid rasps bar components, and 6 polyurethane rasp bar components
Summary
The yield and planting area of maize is the largest among the three main grain crops (maize, rice, and wheat) in China. The mechanization ratio of maize is the lowest among them (maize-69%, rice-87%, wheat-95%[1]). Maize combine harvesters enjoy higher market popularity because of their advantages in reducing operation procedures and saving labor and time[2]. In China, the maize grain of harvested maize has high moisture content in regions adopting the wheat-maize rotation cropping system. Relevant studies show that levels of moisture content have a significant effect on the characteristics of maize[5]. Maize grain with higher moisture content is prone to breaking during threshing. The high rate of kernel damage has become an important restricting factor in popularizing and applying maize grain combine harvest technology in China[7]-
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