There is a series of problems between the existing bunch-planting machines as the bad seed quality, the high injury-rate of seeds and the complex seed sector etc. The working principle of a speed-control mechanism is analyzed and a test is conducted in the laboratory. The results show that the mechanism can transform strip-cropping into bunch-planting,the sowing rate can be regulated and the planting quality is highly reliable.%现有的穴播机存在播种质量不佳、排种器伤种严重或排种机构复杂的问题.分析了一种调速机构的工作原理并对该机构进行实验室试验.结果表明:该调速机构能够将条播转变为穴播,并且播种量可调,播种质量可靠.
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