Design And Experimental Research Of Buckwheat Cyclone Separation Cleaning Test Bench

As an internationally recognized coarse cereal cash crop,buckwheat has high nutritional value and prominent health care function.Due to the limitation of terrain and economic factors,buckwheat is mainly planted in the hilly and gentle slope areas of China,there are poor soil,harsh climate conditions,poor natural conditions,narrow and irregular plots,and large drop between plots.As for the cleaning of buckwheat,the traditional cleaning method is unable to adapted the terrain,and can’t get the ideal cleaning result,so it is not suitable for the cleaning of buckwheat in China.Therefore,in order to improve the capability and operational quality of harvest cleaning,according to the material characteristics and cleaning operation requirements of buckwheat,the influence of various factors on cleaning performance was researched on the self-developed buckwheat cyclone separation cleaning test bench,and the optimal combination of cleaning parameters was determined by the corresponding surface method.The specific conclusions are as follows:(1)By measuring the material characteristics of the main components of buckwheat,including the gravity flow angle of buckwheat seeds and stalks,the suspension speed of seeds and stalks,the basic size and quality of stalks and seeds,etc.,it provides a theoretical fundament for the design of each component of the subsequent test bench,the establishment of simulation model and the determination of simulation conditions.(2)Based on the research results of buckwheat material properties,the main components of the test bench were designed.According to properties of buckwheat material,the cleaning scheme of pneumatic conveying feeding was determined.According to the requirements of cleaning,the cleaning device and key components were researched,designed and selected.(3)The optimal inlet position of the cyclone separation bowl was determined by modeling and simulation analysis of the cyclone separation bowl and the feeding material.The solid modeling was implemented by SolidWorks,and the simulation and analysis were implemented by coupling method of EDEM and FLUENT.(4)According to the simulation results,the cleaning rate and loss rate were comprehensively analyzed and the middle feeding inlet was chosen as the cleaning inlet feeding scheme,and the cyclone cleaning test platform of buckwheat was built and the performance test of the bench was carried out.The main cleaning parts were made and assembled.According to the material characteristics of buckwheat and the requirements of cleaning,the value range of the main test factors was determined.The paper analyzed the main factors affecting of cyclone separation cleaning,feeding fan speed,suction fan speed,suction pipe length on cleaning rate and loss rate.The fitting equations of cleaning rate and loss rate of buckwheat cyclone separation were obtained.(5)The analysis of variance and significance test showed that the error of this experiment was not large,and the fitting of quadratic regression equation with the experimental results was good.Response surface method was used to explore the influence of various factors on the cleaning results.The results showed that:the speed of suction fan had the largest influence on the cleaning rate,followed by the speed of feeding fan,and the length of suction pipe had the least influence on the cleaning rate.The speed of suction fan has the greatest influence on the loss rate of cleaning,followed by the speed of feeding fan,and the length of suction pipe has the least influence on the loss rate.The cleaning rate increases with the increase of the speed of the suction fan,the increase of the length of the suction pipe,and the decrease of the speed of the feeding fan.The loss rate of cleaning decreases at first and then increases with the increase of the speed of the feeding fan,and increases with the increase of the speed of the suction fan and the length of the suction pipe.Considering the cleaning rate and loss rate of buckwheat cleaning,the optimal combination of cleaning parameters should be:feeding fan speed at 750r/min,suction fan at speed 1300r/min,suction pipe extension length at 200mm.