农业机械学报2017，Vol.48Issue(6)：50-58,9.DOI:10.6041/j.issn.1000-1298.2017.06.006
土壤耕作部件极窄刀齿与土壤作用关系研究
Interaction Relationship between Soil and Very Narrow Tine during Penetration Process
摘要
Abstract
With the development of the conservation tillage technology and low disturbance soil treatment,new tillage tools like narrow or very narrow tines are applied more often.In order to provide theoretical supports for the design and optimization of tillage tools and key components,and enrich the theory system of soil-tool interaction,the very narrow tine-soil interaction was investigated,especially during the penetration process.Two tines with different cutting edge shapes were designed and a special test bed was set up based on the soil bin test bench as well.Soil failure mechanism was analyzed.The resistances of the two tines were recorded,analyzed and compared in the penetration stage.And the resistance prediction mechanical models were proposed.The mean resistance sources of the tines were found by analyzing the tines resistance mechanical models.The contact areas of the very narrow tines in different depths were measured and calculated by using the CATIA three-dimensional design software,and the relationships between the resistances and contact areas were analyzed as well.Results indicated that soil failure was mainly caused by the stress field and velocity field in the soil-tine interaction.Mechanical components of soil cohesive,pressure,friction and adhesion were the main resistance sources of the tines.The forces between the tines and soil can be predicted by the soil mechanical components.The prediction models can well reflect the tendency between the resistances and the depth in the tines working processes.Furthermore,the results indicated that there was a nonlinear relationship between the resistance and soil-tine contact area with certain soil property parameters.The tine geometry parameter became an important influence factor of the resistance.关键词
土壤耕作部件/极窄刀齿/土壤失效机理/预测模型/相互作用关系Key words
soil tillage tool/very narrow tine/soil failure mechanism/prediction model/interaction relationship分类
农业科技引用本文复制引用
尤泳,贺长彬,王德成,王光辉..土壤耕作部件极窄刀齿与土壤作用关系研究[J].农业机械学报,2017,48(6):50-58,9.基金项目
国家自然科学基金青年科学基金项目(51405493)和现代农业产业技术体系专项资金项目(CARS-35) （51405493）
