Authors

Abstract

The cross-slot opener is a new type of seeding opener. The sweep angle, which is a key structural parameter of the cross knife, has an important influence on soil disturbance. In this paper, discrete element method and tracer method are used to study the conditions of working speed of 0.83m/s and ditching depth of 130mm, the sweep angles of the transverse knife are 0°, 10°, 20°, 30°, 40°, respectively. The influence of time opener on soil disturbance and working resistance. The simulation analysis of the operation process of the cross groove opener shows that the trenching process under different sweep angles of the transverse knife is basically the same, and the standing knife is the main cause of soil disturbance; both the tracer method and the simulation results show the surface and shallow soil particle disturbance. The proportional and horizontal working resistance first decrease and then increase with the increase of the sweep angle of the cross-slot opener. When the sweep angle of the cross-slot opener is 20°, the micro-disturbance of soil particles and the horizontal work resistance are the least; The relative error of the soil disturbance ratio obtained by the tracer method and the discrete element method are both within 15%, and the relative error of the horizontal working resistance is 6.5%. The established discrete element simulation model can more accurately simulate the soil disturbance process of the cross-slot opener.

Abstract in Chinese

十字槽开沟器是一种新型播种开沟器，作为横刀关键结构参数的后掠角对土壤扰动具有重要影响。本文应用离散元法和示踪法，研究了工作速度为0.83m/s，开沟深度为130mm的条件下，横刀后掠角分别为0°、10°、20°、30°、40°时开沟器对土壤扰动和工作阻力的影响。十字槽开沟器作业过程仿真分析显示，不同横刀后掠角下的开沟过程基本一致，立刀是造成土壤扰动的主要原因；示踪法与仿真结果皆显示表层和浅层土壤颗粒扰动比例和水平工作阻力随着横刀后掠角的增加先减小后增大，当十字槽开沟器横刀后掠角为20°时，对土壤颗粒微观扰动和水平工作阻力均最小；对土壤颗粒速度的仿真结果表明，当横刀后掠角为20°时，在玉米播种深度40mm处土壤颗粒平均运动速度最小，为0.02m/s；通过示踪法与离散元法获取的土壤扰动比例相对误差均在15%以内，水平工作阻力的相对误差为6.5%，建立的离散元仿真模型能够较准确模拟十字槽开沟器对土壤的扰动过程。