【摘要】 为解决当前小青菜机械化播种效率不高的现状,通过理论计算与分析相结合的方法设计了一种一器双行气力圆盘式精量排种器。首先,对一器双行排种器的工作区域进行划分,阐述其工作原理;随后,进行理论计算,明确双排孔排种盘的结构形式和尺寸参数;接着,对排种器其它关键部件进行理论分析,确定了内外侧型孔清种装置的布置,以及分流导种、卸种装置的结构。以种盘转速2.5rad/s、负压1.5kPa、传送带前进速度2.39m/s作为试验条件,进行台架验证试验,对一器双行排种器进行排种性能验证。台架试验结果表明:内圈合格率、漏播率、重播率的平均值分别为92.04%、3.71%、4.26%,外圈合格率、漏播率、重播率的平均值分别为93.70%、3.46%、2.84%,各行排量变异系数为8.48%,总排量变异系数为4.59%,一器双行排种器排种性能良好。更多还原

【Abstract】 In order to solve the current problem that the efficiency of mechanized seeding of Brassica chinensis is not high, and this paper designed a double-row pneumatic disc seed metering device through the combination of theoretical calculation and analysis.This paper divides the working area of the seed metering device at the beginning, and explains its working principle. Then the theoretical calculation is carried out to clarify the structure and size of the seed plate of double-row holes.In addition, the other key components of the seed metering device are theoretically analyzed to determine the arrangement of the seed cleaning device of double-row holes, as well as the structure of diversion guide device and split discharge device.Under the test conditions of rotation speed of the seed plate is 2.5 rad/s, negative pressure is 1.5 kPa, and forward speed of conveyor belt is 2.39 m/s, the bench verification test is conducted to verify the seeding performance of a double-row seed metering device. The results of bench test shows that the qualified rate, miss seeding rate, and reseeding rate of inner circle are 92.04%, 3.71%, and 4.26%, respectively; the qualified rate, miss seeding rate, and reseeding rate of outer ring are 93.70%, 3.46%, 2.84%, respectively.The coefficient of variation of the seed discharge of double-row is 8.48%, and the coefficient of variation of the total seed discharge is 4.59%, indicating that the double-row seed metering device has good seeding performance.更多还原