玉米水平圆盘精密排种器型孔的研究

针对长期以来对水平圆盘精密排种器型孔参数的确定建立在经验基础上，难以保证设计的合理性及对具体种子尺寸如何选择合理型孔的现状，从水平圆盘精密排种器结构和工作原理出发，依据种子几何尺寸分布的特点，统计分析了具有代表特征的大圆、小圆、大扁和小扁4种不同玉米种子囊入型孔的状态特征，从理论上建立了型孔参数设计的数学模型；通过对型孔工作特性的台架试验，应用Lab Windows CVI软件编制的排种性能指标统计程序求出了4品种播种均匀性指标值，以唐抗5号种子为例，实证了型孔参数数学模型设计的合理性，此模型可作为水平圆盘精密排种器型孔参数的设计及根据不同种子类型选择型孔型式的依据。

Experimental study on the cell of the horizontal plate precision meter for corn seed

Based on the status that the cell parameters of the horizontal plate precision metering device were developed according to designer experiences for a long time, it was difficult to design the reasonable cell parameter, and to select reasonable cell type by seed dimensions. Based on the theory and structure of the horizontal plate precision metering device in this paper, along with distribution characteristic of seed dimensions, static characteristic filling into the cell of the different seed types by analyzing the big circle, the small circle, the big flat and the small flat, a mathematic model of the cell parameters was established, and working characteristic of the cell was attained through experiment in the meter test-bed, and the statistic program developed by the Lab Windows CVI software was applied to calculate different performance indexes. The results confirmed that this is a reasonable model used for the design of cell parameters, and this model should be used to design bases of the cell parameters of the horizontal plate precision metering device and select the cell type according to different seed type.