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Rice is an important food crop in the world. The world's rice acreage accounts for about 23% of the total cereal area, paddy output accounts for about 29% of the aggregate cereal production; rice but also of one of the most important food crops, according to the National Grain and Oils Information Center: China 2004 rice planting area of ??approximately 28.23 million hectares, paddy output is about 177 billion kg, with an average yield of 6300 kg / ha (420 kg / mu), far higher than the current level of 193 kg of the average yield of rice in the world. Further improve rice yields and total production in China will be the continued development of the global rice production and world food security issues, has a very important significance. An important measure to increase rice yield is to raise the level of mechanization of rice cultivation, that is, the use of advanced planting techniques. The rice cultivation mechanization contains rice seedling planting the mechanization and live mechanization in two ways. Improve labor productivity, land productivity, cost savings, water conservation, improve rice production mechanization to consider direct seeded rice is better planting techniques. Live production of rice, the rapid development of the Rice Sprout broadcast technology, it has many advantages: ① germination, and improve the ability to withstand cold, the bud broadcast a higher survival rate than non-buds broadcast, and reduced in the soil the water absorption process, early emergence; ② After germination process can pick out the bad seed, high germination rate; (3) bud broadcast can shorten the growing season to reduce before planting seedlings, the after planting Huanmiao, reducing costs. This shows that the direct seeded rice is a simple way of planting, less investment, high efficiency, easy to operate, greatly reduce labor intensity, it is a major reform of the traditional mode of production, its development and has broad prospects. Precision seeding crop seed line spacing the agronomic requirements under the seed spacing, planting depth, accurate single grain sown in the soil. Precision seeding is a modern comprehensive technical measures to improve the yield of grain. Precision seed metering devices is a key component of the precision planter, whose role is the seed of the kinds of indoor design requires timing, single grain discharge, and measure its performance level is an important indicator of sowing uniformity. Precision Metering Device Seeding principle divided into mechanical and pneumatic two categories, pneumatic metering device has strict requirements on the geometry of the seed, no selection of grading, easy single grain-demand, and can be quickly replaced seeding components in order to adapt to different crops to adapt to the higher operating speed and small seed damage rates, high-speed development direction Metering Device. Suction metering device is an advanced seed metering device, with its unique advantages, widely used at home and abroad. Mainly used for planting row crops for rice bud the sowing rare reported. In this paper, the vertical disc air suction Seed charging process of species and throwing a lot of research. First, create a test device performance testing of the metering device, primarily including the PSJ-type seed metering device performance testing machine, rice bud broadcast Precision Metering Device, pneumatic systems, pressure monitoring board, etc.. Secondly, the introduction of a test vertical disc air suction Metering Device structure and composition and its working principle; accordance with the work, will be ranked the species divided into the charge species District, carrying the seed zone and throwing areas in various regions in force adsorption seed kinetic analysis put forward the conditions of the suction holes adsorption seed, and deduced from the seeds can be adsorbed and transported along
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