Precision planting is one key point of precision agriculture.A doorframe type swing seedling pick-up device for the automatic precise field transplanter was designed and tested in a laboratory.The seedling device coul...Precision planting is one key point of precision agriculture.A doorframe type swing seedling pick-up device for the automatic precise field transplanter was designed and tested in a laboratory.The seedling device could automatically extract seedlings from growing trays,transfer them,and release them into the planting unit where they were to be precisely transplanted into the ground.It consisted of a path manipulator and two grippers.The path manipulator for seedling extraction was constructed with creative design ofⅡ-type mechanism combination in series.It consisted of an oscillating guide linkage mechanism and a grooved globoidal cam mechanism.According to the planned seedling pick-up trajectory,the design of the path manipulator for seedling extraction was finished with a set of the closed loop vector equation.The gripper was a pincette-type mechanism using the pick-up pins to penetrate into the root mass for seedling extraction.It consisted of multiple pick-up pins,U-type pull rod,shaft,stop block,compression spring and frame.The mechanical dimensions of the gripper were determined by the tray size and plant characteristic with a set of rectangular equations and the boundary constraint conditions.The final gripper was developed on the basis of cultural practice for vegetable seedling in China.A prototype of the seedling pick-up device was constructed to examine whether its working efficacy was satisfactory or not.According to the analysis on the work process,the seedling pick-up device could precisely complete a work cycle of approaching,penetrating,extracting,transferring,erecting and discharging a seedling.Taking pepper seedlings,tomato seedlings and cucumber seedlings as the transplanting objects,the performance tests were conducted to evaluate the practicality and adaptability of the pick-up device.The laboratory evaluation showed that the pick-up device equipped with two grippers could extract 70 seedlings per minute with an average success ratio of 90.49%.The quality of extracting seedlings was satisfa展开更多
以日光温室西瓜对温光条件的生理反应为基础,针对淮安地区日光温室西瓜栽培的实际生产条件,采用生理发育时间(Physiological Development Time,PDT)作为西瓜定量发育进程的尺度,构建了日光温室西瓜生育期的模拟模型,并利用不同播期和不...以日光温室西瓜对温光条件的生理反应为基础,针对淮安地区日光温室西瓜栽培的实际生产条件,采用生理发育时间(Physiological Development Time,PDT)作为西瓜定量发育进程的尺度,构建了日光温室西瓜生育期的模拟模型,并利用不同播期和不同试验地点的西瓜试验数据对模型进行了检验。结果表明,该模型对西瓜从播种到达发芽期、幼苗期、伸蔓期、开花坐瓜期、果实膨大期、果实成熟期所需生理发育时间的模拟值与实际观测值间的模拟误差均小于3 d,各生育阶段模拟值与观测值的根均方差RMSE分别为1.00、1.58、1.00、1.58、2.24、1.58 d。展开更多
基金National Natural Science Foundation of China(51475216)National Science&Technology Pillar Program during the Twelfth Five-year Plan Period(2013BAD08B03)+3 种基金Jiangsu Province Science and Technology Support Program of China(BE2012381&BE2014373)Priority Academic Program Development of Jiangsu Higher Education Institutions(SFE(2014)37)Jiangsu Province Synergistic Innovation Center Program of Modern Agricultural Equipment and Technology(NZXT02201402)Fund for Independent Innovation of the Jiangsu Province Agricultural Science and Technology(CX(15)1033-5)
文摘Precision planting is one key point of precision agriculture.A doorframe type swing seedling pick-up device for the automatic precise field transplanter was designed and tested in a laboratory.The seedling device could automatically extract seedlings from growing trays,transfer them,and release them into the planting unit where they were to be precisely transplanted into the ground.It consisted of a path manipulator and two grippers.The path manipulator for seedling extraction was constructed with creative design ofⅡ-type mechanism combination in series.It consisted of an oscillating guide linkage mechanism and a grooved globoidal cam mechanism.According to the planned seedling pick-up trajectory,the design of the path manipulator for seedling extraction was finished with a set of the closed loop vector equation.The gripper was a pincette-type mechanism using the pick-up pins to penetrate into the root mass for seedling extraction.It consisted of multiple pick-up pins,U-type pull rod,shaft,stop block,compression spring and frame.The mechanical dimensions of the gripper were determined by the tray size and plant characteristic with a set of rectangular equations and the boundary constraint conditions.The final gripper was developed on the basis of cultural practice for vegetable seedling in China.A prototype of the seedling pick-up device was constructed to examine whether its working efficacy was satisfactory or not.According to the analysis on the work process,the seedling pick-up device could precisely complete a work cycle of approaching,penetrating,extracting,transferring,erecting and discharging a seedling.Taking pepper seedlings,tomato seedlings and cucumber seedlings as the transplanting objects,the performance tests were conducted to evaluate the practicality and adaptability of the pick-up device.The laboratory evaluation showed that the pick-up device equipped with two grippers could extract 70 seedlings per minute with an average success ratio of 90.49%.The quality of extracting seedlings was satisfa
文摘以日光温室西瓜对温光条件的生理反应为基础,针对淮安地区日光温室西瓜栽培的实际生产条件,采用生理发育时间(Physiological Development Time,PDT)作为西瓜定量发育进程的尺度,构建了日光温室西瓜生育期的模拟模型,并利用不同播期和不同试验地点的西瓜试验数据对模型进行了检验。结果表明,该模型对西瓜从播种到达发芽期、幼苗期、伸蔓期、开花坐瓜期、果实膨大期、果实成熟期所需生理发育时间的模拟值与实际观测值间的模拟误差均小于3 d,各生育阶段模拟值与观测值的根均方差RMSE分别为1.00、1.58、1.00、1.58、2.24、1.58 d。
