Authors

Abstract

To explore the change law of contact stress distribution in the process of planting seedlings, the greenhouse transplanting equipment was developed to reduce labor intensity and improve the mechanization level of facility horticulture. This paper takes the direct insertion seedling planter as the research object, adopts the pressure distribution measurement system to study the soil stress distribution rule of different cross-section, digging depth and types of seedling planter. Both horizontal and longitudinal sections were obtained to show an increasing and then decreasing trend. The stress distribution is basically consistent at different digging depths, and the peak contact stress is roughly located at the center position. With the increasing of digging depths, the soil disturbance increases by the seedling planter and the hole tray seedlings, and the peak contact stress also shows a gradually increasing trend, leading to a gradual increase in the peak resistance of the seedling planter. The peak contact stress of the four opening seedling plant was higher than that of the three opening seedling plant. The main reason was that the soil disturbance of the four opening seedling plant increased, the peak contact stress distribution increased, and the peak resistance also increased. This study provides a basis for designing the greenhouse transplanters.

Abstract in Chinese

为探明栽苗过程中接触应力分布变化规律，研制温室移栽机具，降低劳动强度，提高设施园艺机械化水平。本文以直插式栽苗器为研究对象，采用压力分布测量系统研究了不同截面、不同入土深度和不同类型栽苗器的接触界面土壤应力分布变化规律。通过分析不同截面土壤应力的变化规律，得出横向截面和纵向截面均是呈现先增加后减小的趋势。不同入土深度下接触应力分布基本一致，接触应力峰值大致位于中心位置。随着入土深度的逐渐增加，栽苗器、穴盘苗对接触界面土壤的扰动增加，高应力区域占比逐渐增大，接触应力峰值也呈现逐渐增加的趋势，导致栽苗器的峰值阻力也呈现逐渐增大的趋势。四开口栽苗器的峰值接触应力大于三开口的栽苗器，主要原因是由于栽苗过程中四开口栽苗器的土壤扰动量增加，峰值接触应力分布增大，导致峰值阻力也增大。该研究为温室移栽机具的设计提供参考。