Authors

Abstract

To address the limitations of conventional tillage machinery in compacted, high–viscosity saline–alkali lands, this study designed a vertical rotary tiller tool structure suitable for deep fragmentation operations in saline-alkali lands, aiming to improve soil fragmentation efficiency and reduce operational resistance. Employing orthogonal experiments and response surface methodology (RSM), this study established a quadratic regression model correlating soil fragmentation rate and blade force, utilizing the tool camber angle, blade inclination angle, and internal bending angle as key variables. On this basis, a kinematic model of the cutting tool was constructed, and the correlation between the speed ratio and operating conditions was elucidated. Based on the EDEM simulation platform, the dynamic characteristics of cutting force, torque, particle flow velocity, and particle force during one complete rotation of the cutting tool in saline–alkali land were simulated and analyzed. Results indicated that the tool camber angle and internal bending angle exerted the most significant influence on operational effectiveness, with a notable interaction effect observed between them. An optimal parameter combination was ultimately derived through optimization: camber angle of 8.06°, blade–inclination angle of 7.48°, internal bending angle of 7.46°, resulting in a force of 2295.27 N and a soil fragmentation rate of 91.59%. The results established a theoretical foundation for optimizing vertical tiller blade design, while practical guidance for saline-alkali land tillage was developed through studies on soil fragmentation and energy use.

Abstract in English

针对盐碱地土壤板结严重、黏重性高等特点导致传统耕整机械适应性差的问题，本文设计了一种适用于盐碱地深层破碎作业的立式旋耕机刀具结构，旨在提高碎土率和降低作业阻力。研究选取刀具外倾角、刀刃倾角和内折弯角作为主要影响因素，结合正交试验与响应面分析方法，建立了碎土率和刀具受力的二次回归模型。在此基础上，构建刀具运动学模型，明确了速度比与作业工况之间的匹配关系。基于EDEM仿真平台，模拟分析刀具在盐碱地中旋转一周内的受力、扭矩、颗粒流速与颗粒力的动态变化特性。结果表明，刀具外倾角和内折弯角对作业性能影响显著，且二者间存在交互作用。优化结果显示，当外倾角为8.06°、刀刃倾角7.48°、内折弯角为7.46°时，刀具受力为2295.27 N，碎土率为91.59%。研究为立式旋耕刀具的结构优化提供了理论依据，并通过碎土率和能耗特性的研究，为改善盐碱地机械化整地作业质量提供了实践指导。