液压式核桃采摘样机的设计与试验研究机械工程专业论文.docxVIP

关键词：核桃采摘，动力学模型，液压系统设计，试验研究 关键词：核桃采摘，动力学模型，液压系统设计，试验研究 万方数据 Design Design and Test of Hydraufic Walnut Picking Prototype Machine ABSTRACT Nowadays．for the walnut harvest，the country is still predominantly picked by hands．This way of picking not only affect the trees growing in the coming year, but also labour-intensive，low efficiency,and there is even potential safety hazard． With the increasing of walnut planting area of shaanxi province and the the shortage of rural labor,the problem of walnut picking has become increasingly prominent．To solve the above problem，through the support of Education Department of Shaanxi Provincial Government(project number 1 4JF003)，and combined with the theory of the walnut picking mechanism，designing and manufacturing a kind of hydraulic walnut picking prototype machine，and improves the design of the prototype．The research of this thesis is shown in the following aspects： Firstly establish the dynamics model of the tree and the picking system the dynamic characteristics of the tree when its in the picking process are analyzed and solved．The main factors for walnut trees picking are researched． Analysis shows that：walnut trees exhibit a steady—state response in the process of the picking vibration．It shows that the response of the displacement，velocity and acceleration changes in a certain cycle．The key facters for the response are summarized，they include the quality of system，elastic modulus of the tree， damping coefficient and frequency． Secondly,according to the conclusions，and combine the agricultural machinery,mechanical design and relevant knowledge，the whole machine is initiallv identified．Each part of the machine is designed，calculated and modeled． The prototype iS manufactured after assemble the parts and draw the engineering drawings． Thirdly,by using the prototype to do the field picking test，the work performancean，effect and the important indicators of the prototype are evaluated· Experiments show that：for the harves