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The nursery is a very important link in the flue-cured tobacco production , tobacco seedlings quality directly affects the quality of flue-cured tobacco production . Traditional nursery methods of work, time-consuming, the amount of seed , the high cost of this many domestic tobacco companies to introduce a the advanced floating system in the United States , but because of the high technical requirements , and scale production and large investment characteristics and our dispersed planted the flue - cured tobacco production and operation mode are incompatible , tobacco floating system in line with the development of China's national conditions , China 's tobacco seedlings cultivate links imperative . Of tobacco float seedling technology started late, small scale production , supporting simple equipment, low level of mechanization , the status quo is not only China 's tobacco seedlings inefficient , and more human labor input , so that the floating system automation and intelligence is the ultimate goal of China 's tobacco float seedling development . Characteristics of domestic floating nursery do the work of the following three aspects : 1 . The design principle of suction - coated seeds sown , according to the principle of suck species seeder nozzle flow field near the theoretical analysis, get the seeds sucked up the critical air velocity , and ANSYS software to simulate 5KPa 10 KPa, 20KPa 30KPa nozzle flow field when the degree of vacuum , when the bottom of the nozzle being located in the seed sowing these vacuum degree corresponding nozzle attached distance 3mm , 4mm, 5.5mm, 7mm. Ultimately determine nozzle adsorption distance increases along with the increase of the degree of vacuum . 2. From the theoretical analysis of the characteristics of the gas jet , the gas jet theory diverging diameter and divergence of the correctness of the diameter of the jets through a large number of experimental verification , analysis of the test results obtained in the standoff distance is less than 70mm , the theoretical values ??and the actual test values good agreement . 3. Analysis of high-speed airflow added water , and DG-10 model gun in the water flow under different pressure conditions determined by experiment .
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