Design and experiment of diversion type double-cylinder cyclone separation system for rapeseed combine harvester
To solve the problems of high loss rate and cleaning rate of cyclone separation cleaning device for rapeseed combine harvester.A double-cylinder type of cyclone separation cleaning device with functions of diversion and secondary settlement was developed.The structural parameters of the cyclone separator were analyzed and calculated.Based on statics and kinematics,the migration of rapeseed in the airflow field of the cyclone separator was analyzed,and the differential motion equations of rapeseed were established.The range of structural parameters of the flaring shaftless spiral blade and the secondary settling cylinder were determined.The main factors that affected the cleaning performance of the cyclone separator were clarified,and the structural rationality and the performance of the cyclone separator was verified based on a coupled model of computational fluid dynamics(CFD)and discrete element method(DEM),and the internal airflow velocity of the guided twin tube cyclone separation and cleaning device was verified.The single factor experiment and quadratic rotation orthogonal combination experiment were conducted to study the effects of the feeding rate,the speed of the blower and the speed of the fan on the cleaning performance of the cyclone separation cleaning device.The regression equations between the cleaning rate,loss ratio and those factors was built.The results of the single factor experiments indicated that the performance of the cleaning device was better when the feeding rate was 0.6～1.0 kg/s,the speed of the blower was 550～750 r/min,and the speed of the fan was 1 400～1 800 r/min.The optimization results showed that the optimal parameters combination was the feeding rate 0.71 kg/s,the speed of the blower 616 r/min,and the speed of the fan 1 667 r/min.The results of the field experiment under the optimal parameters combination showed that the cleaning rate and loss ratio was 92.39%and 4.80%,respectively.
万方数据
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