Authors

Abstract

Aiming at the complexity and insufficient adaptability of current weeding devices for ridge tillage, this paper presents the design of a clamping-shear weeding device that mimics the hand-grabbing motion. Through the force analysis of the weed root system, the optimal shovel surface inclination angle is determined to be 10°~40°. To ensure the sliding cutting condition, the shovel blade angle is calculated and determined as 30°. Based on the Mohr-Coulomb shear theory, the weed resistance model is developed, and the shovel width is set at 50 mm based on the principle of minimum resistance. A single-factor test was conducted with the soil penetration depth of 40 mm and the clamping-shear speed of 4 cm/s, the results showed that the weed removal rate was over 85% and the crop injury rate was less than 6%, meeting the operational requirements of intra-row weeding. The optimal performance was observed with the shovel inclination angle of 30°.

Abstract in Chinese

针对现有垄作田间株间除草装置结构复杂、适应性差等问题，本文设计了一种模仿人手抓取操作的夹持剪切式除草装置。通过对杂草根系的受力分析，确定最佳铲面倾角为10°~40°。以满足滑切条件为原则，对铲刃倾角进行分析计算，确定铲刃角为30°。基于摩尔-库仑剪切理论，建立除草阻力模型，以最小阻力为原则，确定除草铲宽度为50mm。设定入土深度40mm、夹持剪切速度4cm/s，进行了铲面倾角单因素试验，结果表明：除草率在85%以上，伤苗率在6%以下，满足垄作田间株间除草作业要求，当铲面倾角为30°时，除草性能为最优值。