Parameter optimization and mechanism analysis of pepper spring-tooth drum picking device based on DEM

Le résumé fourni par la source

To address the issues of unclear mechanisms and poor harvesting quality in mechanized pepper harvesting, a simulation model based on the discrete element method (DEM) is developed to analyze the harvesting process and optimize key parameters. Through theoretical analysis, kinematic models of the spring-tooth drum and plant system were established, along with mechanical models of spring-tooth and pepper interactions, to elucidate the relationship between motion characteristics and key parameters. A complete pepper plant DEM model was developed to investigate the separation characteristics of peppers and the positional variation patterns of plants. Single-factor tests were performed to determine the optimal ranges of key parameters including rotation speed (150–190 r/min), forward speed (0.5–0.7 m/s) and spring-tooth angle (15–20°). A quadratic regression orthogonal rotary combination test was then employed to optimize these parameters. The optimization results showed that the loss rate ( η 1 ) and picking rate ( η 2 ) achieved optimal values of 5.66 % and 85.90 %, respectively, at a rotation speed of 170 r/min, a forward speed of 0.61 m/s and a spring-tooth angle of 17° Bench tests revealed a loss rate of 6.07 % and a picking rate of 90.23 %, with relative errors of 7.24 % and 5.04 % respectively compared to the simulation outcomes. This study establishes a theoretical foundation for understanding pepper harvesting mechanisms and provides technical insights for optimizing harvesting devices and developing machinery for similar crops.

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