Experimental Study On Stripping Apparatus With Air Suction For Fresh Super Rice

The super rice has many differents with common rice in physical property, such as high yield, hard threshing, high moisture content, high density,1000grain weight,etc. The new demand on the combine harvester has been put forward. Stripper combine harvester is featured with earlier harvesting, simple structure, less power threshing, eliminating separation losses. There were a few studies about stripper harvester on supper rice. A new stripping apparatus based on rice (wheat) combine stripper harvester "4ZTL-2000" was designed. In the upright and lodging status, single and multiple factors experiment about fresh super-high-yielding rice has been carried out. In order to maintain the moisture content of super rice, each test were completed within three hours, since it leaving rice field. By virtue of high speed photography technology, the material movement rules in positive inertia separation chamber was revealed for the first time. The chief contents are as follows:1) A new stripping apparatus with air suction, which adjust to main parameters and characteristics of structure which influence the working performance of stripping header were designed. The modulation includes liner velocity of triangle plate teeth, speeding velocity, inlet opening size and air flow speed, vertical height of the stripping rotor center, horizontal opening of the header inlet. Through the Plexiglas plate of the apparatus, the high speed photography study about the process of grain stripped in stripper header and separated in chamber2)According to the single factors and multiple factors experiment which the orthogonal test of four factors at three different levels were finshed, the sequence of the effect of single factor on total grain loss was that the velocity of triangle plate teeth>feeding speed>air-flow velocity>inlet opening size. The optimization process parameters of stripping apparatus:velocity of triangle plate is23m/s, feeding speed is1.1m/s, inlet air-flow velocity was14m/s and inlet opening size was120mm.As inlet air-flow velocity is14m/s leads to more fuel consumption. So set inlet air-flow velocity is14m/s, quadratic orthogonal rotating experiment was carried out, which selected velocity of triangle plate, feeding speed, inlet opening size and vertical height of the lowest point of hood as experiment factors. The regress equations were founded about the effect of four parameters on unthreshed losses、entrainment losses、splashing losses and total losses separately. The results of analysis of variance showed that the velocity of triangle plate teeth, speeding speed, inlet opening size and interaction effect of inlet opening size and feeding velocity are the most import to total grain losses, the vertical height of the lowest point of hood are less important. Combined with actual situation, a group of optimal parameters were developed at different speeding speed.3)With the super rice in lodging status, the single factors experiment which selected velocity of triangle plate, feeding speed, inlet opening size,vertical height of the lowest point of hood, inlet opening size and air-flow velocity as experiment factors was carried on. The results indicate the relationship betweenn-grain losses and six factors. The orthogonal test put forward the best scheme are:velocity of triangle plate teeth is24m/s, speeding speed is1.1m/s, inlet opening size is90mm, vertical height of the lowest point of hood is120mm,taotal loss is1.6%.4) Observation and image analyses were done about the process of grain separation and chaff moving in positive inertia separation chamber by high speed video. The writer try to explain the theory why positive inertia chamber can solve the block in harvesting super rice in long time after frost.