Abstract
Poor shelling quality degrades the performance and profit of the peanut industry. The Hertz theory and the wear resistance experimental method were applied to identify a highly wear-resistant material guaranteeing a low mechanical damage rate (MDR) of peanut kernels. The Box–Behnken design method was applied in the experiment to illustrate the influence of the material’s elastic modulus (X1), radius of curvature of the key parts (X2), rotating speed of the shelling drum (X3), and clearance between the shelling drum and concave screen (X4) on MDR and shelling efficiency (SE). Depending on the analysis of variance, the weights of the influential factors were observed as X1 > X3 > X4 > X2. The mathematical models of MDR and SE were derived from the least squares’ method, and four-dimensional slice diagrams of the three most significant factors were used to illustrate the trends of MDR and SE. A multi-objective analysis provided the optimal combination of parameters as: X1 = 10 MPa, X2 = 12.77 mm, X3 = 277.48 r/min, and X4 = 24.24 mm, yielding MDR = 4.89% and SE = 97.91%. The results were further verified by a production trial test, proving that the proposed solution with the selected material, machine design, and working parameters were effective in improving peanut shelling quality.
Highlights
Peanut (Arachis hypogaea Linn), known as groundnut, from the family of legumes, is an important oil crop and an excellent protein resource [1]
Peanut shelling machinery has been widely used in the shelling process, but the high mechanical damage rate (MDR) caused by shelling has been a problem in
The mechanical interactions between the shelling parts of the machine and the peanut were analyzed with Hertz theory, providing a theoretical basis for material and parameter optimization of key components
Summary
Peanut (Arachis hypogaea Linn), known as groundnut, from the family of legumes, is an important oil crop and an excellent protein resource [1]. It is rich in functional proteins, amino acids, monounsaturated fatty acids, resveratrol, phytosterols, folic acid, and vitamin E, which play an important role in improving body functions and preventing heart diseases [2,3]. A statistical report from the Food and Agricultural Organization of the United Nations in 2019 indicated that the cultivated peanut acreage in China alone was 4,508,393 ha, yielding 17,519,600 tons of peanut pods annually and contributing to 40% of the global production [10]. Peanut shelling machinery has been widely used in the shelling process, but the high mechanical damage rate (MDR) caused by shelling has been a problem in
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