The Research Of Orderly Arrangement In Embryo Of Super-rice Seeds Based On Single Axisymmetric Characteristic

The technology of mechanized seedling tends to be increasingly urgent owing to the expansion of area cultivating the super-rice. The super-rice is quite different from the ordinary rice in planting patterns because of its ultra strong tillering ability.3～5ordinary rice seeds are needed per seedlings-taking area, while only2±1super-rice seeds required. The requirement of seeding precision in quantity and position is more important. The seedlings arranged as the seeds and the roots wind into blanket, which meet transplanted requirements. The geometry model of super-rice has been built according to its single axisymmetric characteristics, and a new method that sowing evenly and orderly by controlling the movement stability of super-rice has been proposed. A type of vibration seed-metering device has been designed which was actuated by a slider-crank mechanism. The purpose of orientation achieved by imposing appropriate constrains on seeds during sowing to make the seeds move to the same direction steadily. The contents and results of the research were listed as follows.1) Described the domestic and foreign research status of rice seeding device, and pointed out the existing precision seeding mechanism cannot satisfy the request of super-rice precise sowing seeds, a new seeding method was invented which aims to make the super-rice seeds orienting ordered arrangement in embryo.2) According to the surface feature of the seeds, we could observe that the surface awns of the rice seeds point to the glumes tip from the rice glumes. A type of vibration seed-metering device has been designed which own a guide plate. The orienting ordered arrangement was achieved by utilizing the characteristic of the friction coefficient between seeds and the guide plate are different when it moves along the different directions of the major axis.3) The Culer dynamics equation has been built after the force was analysed of the rice seed. A system model was built in the Simulink module of Matlab software, which was used to analysis the stability of the attitude angle (α, β,γ) which in Euler dynamics equation. The seeds orienting ordered arrangement in embryo achieved by controlling the movement stability around the/-axis through adjusting the structure parameters.4) Virtual seed-metering device prototype has been set up by parametric modeling in the software of ADAMS after the model was simplified. The scheme of directional sowing was demonstrated feasible by compare the movement of two seeds with different initial posture. The effect of the structure parameters on the attitude angle(y) and the seed translational speed relative to the seed-metering device have been analysed.5) The range of structure parameters value was confirmed by simulation. In the orthogonal experiment, the success rate of the embryo ordered was the test index, and the range analysis was used to get the importance sequence of the structure parameters to the movement stability of super-rice seed. Also, it can obtain the best combination of parameters:0=10°,φ=20°, R=2mm, ω=21π,μ2=1.36,μ’2=1.07. Taking the verification test under the best parameters combination, the success rate of the embryo ordered was achieved87%, and the orienting process of a group seeds was recorded by a video.6) Make a conclusion of the paper and put forward an outlook of the further research.