齿轮连杆凸轮组合式栽植机构仿真与试验

Simulation Analysis and Experiment for Gear-linkage-cam Combination Planting Mechanism

针对旱地移栽机打穴栽植需要,设计了一种齿轮连杆凸轮组合式栽植机构,该机构由齿轮机构、连杆机构、槽型凸轮和鸭嘴式打穴栽植器等几部分组成。通过建模软件Pro/E建立了该栽植机构的虚拟样机模型,并将虚拟样机模型导入刚体运动仿真软件ADAMS中。仿真分析了运动参数λ在小于1、等于1和大于1情况下栽植机构前后鸭嘴的运动轨迹,结果表明只有在λ等于1时栽植机构的运动才能满足零速投苗运动条件要求,栽植时可以得到较好的植苗状态,验证了参数选择和机构设计的正确性和合理性。以自制全自动蔬菜移栽机为试验样机,新型鸭嘴式栽植机构为研究对象,分别从栽植均匀度、钵苗直立度两个方面进行了试验。试验结果表明:株距误差率仅为2.22%,钵苗直立度全为优良,表明所设计的鸭嘴式栽植机构能够满足栽植要求。

To meet the dry land punch planting needs, a gear-linkage-cam combination planting mechanism which is composed of planetary gear,planetary carrier,connecting rod,groove cam and plant apparatus was designed. Through the modeling software Pro / E,the virtual prototype model of the plant mechanism was established and it was imported into the rigid kinematics simulation software ADAMS.Simulating the trajectories of the two duck-billed when the motion parameter λ in different conditions asλ < 1,λ = 1 and λ > 1,the results showed that only when λ = 1 the motion of plant mechanism could meet the zero velocity for seedling motion requirements and get better seeding status, testing the correctness and rationality of the parameter selection and mechanism design. Taking the self-made automatic vegetable transplanter as experimental prototype and planting mechanism as the research object,the experiment has carried out in two aspects: the planting uniformity and the upright degree of pot seedling. Experiments showed that seedling distance error rate was only 2. 22% and seedling perpendicularity was good, proved that the designed planting mechanism could meet the planting requirements.