关键词: 玉米, 播种, 漏播, 机械检测, 补种装置

Abstract: Aiming at the problems of missed seeding in the process of corn sowing, a mechanical missing seeding detection and reseeding device was studied by using the redundancy design method. The seed filling of the main seed metering device was continuously detected through the spanning seed probe rod, and the locking rod was driven to lock and unlock the reseeding device, so as to realize reseeding. A new type of seed probe rod structure was designed, adopting the doubledeck structure of the seed probe rod, to improve the precision of missed seeding detection. Optimizing the structural parameters of the detection device to realize the quick locking and unlocking of the reseeding device. Through the motion analysis of the reseeding device, the structural parameters of the reseeding device and the conditions for synchronous reseeding were determined to improve the seeding quality. Combined with the theoretical analysis, the single factor test and orthogonal test were carried out with speed of advance, seed exploration angle, and the maximum force of the reseeding return spring as the test factors, and the missed seeding index and qualified index as the performance indicators. The optimal parameter combination was determined as follows: the speed of advance was 0.9 m/s, the seed exploration angle was 45°, and the maximum force of the reseeding return spring was 12 N. Under this condition, the missed seeding index was 3.4%, and the qualified index was 94.5%, which could conform to the relevant national standards.

Key words: corn, sow, missing seed, mechanical detection, reseeding device