为了进一步改进气吸式排种器的性能,找出影响排种性能的关键因素,根据GB6973-2005《单粒(精密)播种机试验方法》中排种性能指标的计算方法,利用排种器性能检测试验台,分别以输送带速度、气吸室真空度为试验参数,以玉米种子为试验对象进...为了进一步改进气吸式排种器的性能,找出影响排种性能的关键因素,根据GB6973-2005《单粒(精密)播种机试验方法》中排种性能指标的计算方法,利用排种器性能检测试验台,分别以输送带速度、气吸室真空度为试验参数,以玉米种子为试验对象进行了试验。分析实验结果表明:输送带转度、气吸室真空度对排种器的排种性能影响明显。当输送带速度为4 km/h时排种效果较好,合格率达到了92.41%。当气吸室真空度为-4 k Pa时排种效果较好,合格率达到93.65%。展开更多
In this paper, we build an air conveyor with newly developed vortex bearing elements, and study the flotation precision of the front-end of the substrate in quasi-static flotation transport. We experimentally discuss ...In this paper, we build an air conveyor with newly developed vortex bearing elements, and study the flotation precision of the front-end of the substrate in quasi-static flotation transport. We experimentally discuss the three influential factors: air supply pressure, thickness of the substrates and installing direction of the vortex bearing element. We find that during the process of transport the movement of the substrate leads to the variation of flotation height. The amplitude of variation (e.g. flotation precision) is dependent upon the bearing stiffness and the suction force of the vortex bearing elements. Increasing air supply pressure properly can improve the flotation precision, but an excess pressure can cause over-suction due to high negative pressure and result in a poor flotation precision. We also know that the flotation precision of thin and light substrates are easily affected by the suction force of vortex flow because they float with a high flotation height and are more susceptible to deformation. Finally, we investigate four installing directions of the vortex bearing element. Different installing direction can lead to different variation of flotation height.展开更多
文摘为了进一步改进气吸式排种器的性能,找出影响排种性能的关键因素,根据GB6973-2005《单粒(精密)播种机试验方法》中排种性能指标的计算方法,利用排种器性能检测试验台,分别以输送带速度、气吸室真空度为试验参数,以玉米种子为试验对象进行了试验。分析实验结果表明:输送带转度、气吸室真空度对排种器的排种性能影响明显。当输送带速度为4 km/h时排种效果较好,合格率达到了92.41%。当气吸室真空度为-4 k Pa时排种效果较好,合格率达到93.65%。
文摘In this paper, we build an air conveyor with newly developed vortex bearing elements, and study the flotation precision of the front-end of the substrate in quasi-static flotation transport. We experimentally discuss the three influential factors: air supply pressure, thickness of the substrates and installing direction of the vortex bearing element. We find that during the process of transport the movement of the substrate leads to the variation of flotation height. The amplitude of variation (e.g. flotation precision) is dependent upon the bearing stiffness and the suction force of the vortex bearing elements. Increasing air supply pressure properly can improve the flotation precision, but an excess pressure can cause over-suction due to high negative pressure and result in a poor flotation precision. We also know that the flotation precision of thin and light substrates are easily affected by the suction force of vortex flow because they float with a high flotation height and are more susceptible to deformation. Finally, we investigate four installing directions of the vortex bearing element. Different installing direction can lead to different variation of flotation height.
