Authors

Abstract

To overcome inadequate functional integration, irregular pits, and insufficient agricultural machinery and agronomy in tobacco seedling transplanting equipment under film, a digging transplanting integrated machine was built. The machine uses parallel four-bar mechanism. The excavation equipment uses conical spiral blades. Using the trajectory approach, the four bar mechanism's fundamental parameters can be reversed. This method meets the requirements for coordinated excavation and transplantation. Mechanical study of soil units determines upward movement characteristics. Additionally, spiral angle, spiral blade outer diameter, and spiral blade speed are quantified to affect soil movement. The range of factors is derived. Based on three factors binary regression orthogonal combination simulated optimization experiment, a discrete element analysis was performed to enhance parameters. Experimental factors optimized include a spiral angle of 19°, a spiral blade diameter of 378 mm, and a rotational speed of 258 rpm. The two optimized test indicators are: a 193 mm hole depth and 350 mm hole diameter. The improved results were verified by field validation studies using a 191 mm hole depth and 347 mm hole diameter. The simulation optimization results and field validation experiment results are very similar. This study provides a technical basis for tobacco farming concurrent drilling and transplanting research.

Abstract in Chinese

针对目前烟苗膜下移栽装备功能集成度差、打塘不规整、农机农艺融合度较差等问题，设计了一种基于平行四杆机构的打塘-移栽一体式移栽机，其中打塘装置采用锥形绞龙结构。通过轨迹法反求出四杆机构的基本参数，满足打塘和移栽的同步同穴作业。通过力学分析，确定出土壤运动过程中的临界条件，计算出影响土壤运动的主要因素包括螺旋升角、钻头外径和钻头转速，并推导出因素的范围。为优化参数，进行了基于离散元的三因素二元回归正交组合仿真优化试验。优化后的试验因素为：螺旋升角为19°、钻头外径为378mm、钻头转速为258rpm。优化后的两项试验指标的结果为：穴孔的深度为193mm，穴孔的直径为350mm。为验证优化后的结果进行了田间验证试验，穴孔深度为191mm，穴孔直径为347mm。田间验证试验结果与仿真优化后的结果十分接近。本研究为烟苗打塘-移栽一体机的研发提供技术参考。