旱地全膜双垄沟玉米精量播种机的设计与试验

为满足旱地全膜双垄沟农艺技术要求，设计了一种玉米精量播种机。为实现播种机平稳工作、保证膜下播种深度，采用双向平行四杆仿形机构，根据初始工作角和最大上下仿形量，确定了仿形机构的各项尺寸参数，上下仿形量可达到98.35 mm，左右仿形角达到15.2°，满足仿形播种要求；为减少漏播，降低空穴率，采用凸轮-平面连杆开启式穴播轮；借助ADAMS软件对穴播器成穴过程进行仿真分析，探讨了穴播轮滑移率对穴孔形状的影响，并以此对播种机的前进速度进行优化，降低了空穴错位率。田间试验结果表明：全膜双垄沟播玉米精量播种机作业后空穴率为0.9%，穴粒数合格率为93.6%，膜下播种深度合格率为91.8%，穴位错孔率为2.5%，作业质量符合行业技术标准要求。

Design and test of corn precision seeder for dry-land whole film double furrow sowing

In order to meet the agronomic technical requirements of dry-land whole film double furrow sowing, a corn precision seeder was designed. To realize the smooth working of the seeder, and to ensure the sowing depth under film, the profiling mechanism of bidirectional parallelogram linkage was adopted. According to the initial work angle and the maximum amount of profiling, all size parameters of the profiling mechanism were determined. The profiling volume in vertical direction reached to 98.35 mm, and the profiling angle in horizontal direction reached to 15.2°, which met the requirements of profiling sowing. To reduce missed sowing, and to reduce the rate of no-seed holes, the open-type dibbling wheel with cam-plane connecting rod was adopted, With ADAMS software, the hole-making process of the seeder was simulated and analyzed, and the influence of slipping rate of dibbling wheel to shape of holes was explored, so as to optimize the forward speed of the seeder and to reduce the hole dislocation rate. The field test results showed that, by using the corn precision seeder for dry-land whole film double furrow sowing, the rate of no-seed holes was 0.9%, the pass rate of seed number per hole was 93.6%, the pass rate of sowing depth under film was 91.8%, and the hole dislocation rate was 2.5%, so its working quality could meet the requirement of technical standards.