农业机械学报2018，Vol.49Issue(5)：136-142,7.DOI:10.6041/j.issn.1000-1298.2018.05.015
卵形-全正圆齿轮行星系变速扎穴机构设计与试验
Design and Experiment of Variable Speed Picking Hole Mechanism for Oval and Circular Gear Planetary System
摘要
Abstract
Aiming to the problem that picking hole mechanism of deep-fertilization liquid fertilizer applicator can not meet fertilizer-spraying needle inserted and pulled out of soil vertically all the time,according to the meshing characteristic of combining gears for oval non-circular with round gears.A new kind of picking hole mechanism was designed to achieve variable speed and vertical posture at picking hole.The meshing principle of oval gears were used,which controlled every moment change of angular velocity to achieve variable speed picking hole in the working period,the characteristic met specific requirement,which had horizontal velocity of fertilizer-spraying needle trend to zero inserted and pulled out of soil,small hole mouth was achieved.To achieve small hole mouth and picking hole for vertical posture,the mathematics model of mechanism was established,with the rotational speed of picking hole mechanism of 120 r/min,forward speed of 1.2 m/s and depth of picking hole of 80 mm as constraint conditions,structure parameters of mechanism were obtained,including half shaft distance of oval gear shaft of 39.9 mm,eccentricity of O.15,diameter of circular gear pitch curve of 68 mm and length of fertilizer-spraying needle of 140 mm,and virtual experiment was verified by using the ADAMS software.The experiments of high-speed camera and picking hole were carried out,the trajectory shape of fertilizer-spraying needle,curve of level absolute velocity and hole width were obtained when the forward speed was 1.2 m/s,rotational speed of picking hole mechanism was 120 r/min and depth of picking hole was 80 mm,the reasons for the formation of such results were analyzed.Experiments results showed that fertilizer-spraying needle still guaranteed the target that had small hole mouth and picking hole for vertical posture.关键词
液态施肥机/扎穴机构/卵形齿轮/变速扎穴/性能试验Key words
liquid fertilizer applicator/pricking hole mechanism/oval gear/variable speed picking hole/performance experiment分类
农业科技引用本文复制引用
王金武,周文琪,李鑫,冯金龙,江东璇,王金峰..卵形-全正圆齿轮行星系变速扎穴机构设计与试验[J].农业机械学报,2018,49(5):136-142,7.基金项目
国家自然科学基金项目(51675093) （51675093）
