Performance evaluation of a peanut grading machine based on adjustable hopper outlets

Abstract

Standardization of agricultural products, including peanuts, is crucial for meeting quality standards and maximizing economic returns. Manual sorting and grading are often subject to human error and inconsistencies. This study aimed to optimize peanut grading efficiency and evaluate the performance of a peanut grading machine under varying hopper outlets. An adjustable grading machine was utilized to assess the impact of different hopper outlets on grading accuracy. Statistical analysis, including an independent sample t-test, was employed to examine potential differences in peanut dimensions (length, width, thickness) and mass based on hopper outlet adjustments. Results revealed average dimensions of 17.39 mm (length), 8.77 mm (width), 9.66 mm (thickness), and an average mass of 0.80 g for peanuts with 7.5 % moisture content (wet basis). While no statistically significant differences were observed between 25 mm and 50 mm hopper outlet openings (P > 0.05), the grading machine demonstrated a high output capacity of 178.11 kg/h and 161.17 kg/h for 25 mm and 50 mm hopper outlet openings, respectively. In addition, the grading efficiency for 25 mm and 50 mm hopper outlet openings was 99.65 % and 99.61 %. These findings highlight the potential of automated grading systems to enhance the efficiency and accuracy of peanut grading, leading to improved standardization, quality control, and overall value in the peanut production chain.