precision drill 精密条播机
precision grain drill 精密播种机
twelve-row precision drill 十二行精密播种机
twelve row precision drill 十二行精密播种机
precision seed drill 精密播种机
The device is posterior cutter grinding to drill in cone surface grinding method that it can vouch for drill with reasonable back Angle, and symmetry precision is high.
本装置采用圆锥表面磨法对钻头进行后面刃磨，可保证磨出的钻头具有合理的后角，对称精度高。
In order to improve the drilling quality and the automation of the precision drill, an automatic monitoring alarm and digital seed rate display system was developed.
为了提高精密播种机的工作质量和自动化水平，研制了工况自动监控报警系统及播量数显系统。
The mathematical model of the precision drill unit with parallelogram linkage was brought up and its dynamic behaviors were analyzed with this mathematical model.
本文提出了具有平行四连杆仿形机构的精密播种单体的数学模型，并使用该数学模型对精密播种单体作了动力学分析。
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