Abstract: In order to explore the influence of structural parameters of vertical rotary tillage blade on its own stress and operation effect during operation, a discrete element model of vertical rotary tillage blade operation process was established by using single factor test method. The effects of blade bending angle, blade edge angle and neckedin blade edge on soil entry resistance, tillage resistance, torque and soil breaking rate of vertical rotary tillage blade, and the effects of blade tip fillet radii on soil entry resistance of vertical rotary tillage blade were studied. Through the orthogonal experiment,  the prediction model of the influence of the blade bending angle, blade edge angle, neckedin blade edge on the resistance, torque and soil breakage rate of vertical rotary blade was studied and established. The response surface analysis and the constructed prediction model were used to optimize and analyze the above three angle parameters with the aim of reducing drag and lifting efficiency. The obtained results showed that when the blade bending angle was 6.140°, the blade edge angle was 5°, and the neckedin blade edge angle was 10.752°. At this time, the tillage resistance of the rotary tillage cutter was 1131.164N, the torque was 307.758 N·m, and the soil crushing rate was 89.321%.

Key words: vertical rotary tillage blade； structural parameter, discrete element method； response surface； prediction model

摘要： 为探究立式旋耕刀的结构参数对其作业过程中自身受力及作业效果的影响，建立立式旋耕刀作业过程离散元模型，利用单因素试验方法，研究立式旋耕刀刀具外倾角、刀刃倾角、内折弯角对旋耕刀入土阻力、耕作阻力、扭矩、碎土率的影响，以及刀尖圆角半径对刀具入土阻力的影响。通过正交试验，研究并建立立式旋耕刀刀具外倾角、刀刃倾角和内折弯角对其所受阻力、扭矩及碎土率影响的预测模型。以减阻提效为目标，通过响应面分析和所构建的预测模型对上述3个角度参数进行优选和分析。结果表明，当刀具的外倾角为6.140°、刀刃倾角为5°、内折弯角为10.752°时，旋耕刀的耕作阻力为1 131.164 N、扭矩为307.758 N·m、碎土率为89.321%。

关键词: 立式旋耕刀, 结构参数, 离散元法, 响应面, 预测模型