Experimental Research On The Stripping Unit Without Air Suction

A stripping uint with the cross-flow fan was developed, aimed to reduce the grain losses at the rear of the stripping drum reduce the blocking to the air outlet sifter and diffuse dust.. This dissertation gives overall scheme of the rig and had mad experimental study .In this paper, two kinds of cross-flow fan were used during experimental Research :the one with bent vane and the one with vertical vane, first of all, The air flow field in the unit was demonstrated by fire sparks and silk thread, also the air flow field in the unit were measured and it's state and distribution were got when working with the two kinds of cross-flow fan. The grain losses were measured and compared when adopting the two different cross-flow fan, and the reason of the grain loss was analysied on the unit with two kinds of cross-flow fan, it's found that the cross-flow fan with bent vane is superior to the vertical vane .The pneumatic performance of the model cross-flow fan used in this dissertation was pre-searched at 1500 rpm by professor wang in this dissertation. The pneumatic performance of the fan was got when working at several different rotation speeds based on the similar theory, which is useful to estimate the pneumatic performance of the fan when the air flow of the fan changes, and further the grain loss of the unit can be estimated.Through the experimental analysis of the single factor, The influence of the rotation speed of the two kinds cross-flow fan and the forward speed was find on grain losses of the unit ,finally the optimum combination of the forward speed and the rotation speed was got.The air-flow field in the stripping unit can be adjusted easy by changing the rotation speed of fan which is benefit to reduce the grain losses, it was found during experiment that thecross-flow fan can diffuse some of MOG(material other of grain )and diffuse it in a certain direction which is useful to satisfy the working condition for driver and lighten working load of the threshing unit of the combine harvesterCandidate and Speciality: Peng Shengmin; Machinary Design and TheorySupervisor: Prof. Zhang Huiyou...