目前,我国用于育秧的播种机,大多采用外槽轮、筛型孔条或窝眼轮和机械式排种装置。这种播种机由于采用外槽轮排种器,往往产生播种均匀性差,空穴率高,不能满足每穴2～3粒种子的精度要求,且这种结构易形成摩擦和挤压,造成伤种或死种。 At present, most of the sowing machines used for raising seedlings in our country use outer sheaves, sieve-type holes or sockets and mechanical sowing devices. Due to the use of an outer tank seed metering device, this kind of planter often has poor sowing uniformity and high void ratio, which can not meet the precision requirements of 2-3 seed seeds per hole, and the structure is easy to form friction and squeeze and cause injury Species or dead species.