Experimental Research On The Falling Soil Conveying Parts Of The Cyperus Esculentus Harvester

Cyperus esculentus is an economic crop with high comprehensive utilization value,but due to the difficulty of its mechanized harvesting,my country has not planted it on a large scale after its introduction.The fundamental reason is the soil removal rate of the Cyperus esculentus harvester during the harvesting process.The soil content of the final harvest is too high,and the secondary treatment has to be carried out,which affects the quality of the Cyperus esculentus.Aiming at the above problems,this paper designs a falling soil conveying component suitable for the Cyperus esculentus harvester.The theoretical analysis,structural design,simulation analysis and bench test of its main working components are carried out.The main research contents of this paper are as follows:(1)Combined with the overall structure and working principle of the conveying parts of the Cyperus esculentus harvester at home and abroad at the present stage,combined with their advantages and disadvantages,the design concept of the falling soil conveying parts of the oil bean harvester is proposed.(2)Investigate the field conditions of the Cyperus esculentus experimental field in Qianguo County,and carry out experimental analysis on the material characteristics of the Cyperus esculentus and its soil in combination with the field environment at the time of harvesting the Cyperus esculentus.Triaxial dimensions,thousand-grain weight,moisture content,density,angle of repose,and their dynamic and static friction coefficients,and the soil bulk density and moisture content were measured to provide a basis for the parameter design of falling soil conveying components.(3)Design the falling soil conveying components,and select the type of inclined mesh chain conveying and separation.The width of the net chain is determined to be 1.3m by the distance between the planting ridges,and the sieve holes of the net chain of 6.8mm are formed by the regular arrangement of two torsion springs,and the soil falling capacity is analyzed by the method of comparison.A 12-tooth special-shaped vibration sprocket is designed to realize the vibration of the net chain.Through calculation,the minimum net chain linear speed to achieve vibration is 0.78m/s,and the height of the thrown material is 20.73 mm.Leak-proof and chain-proof treatment are carried out on the chain,and finally the frame and transmission mechanism are designed.(4)Use EDEM software to perform discrete element simulation on the main working parts(lifting network chain),establish grids and analyze the screening rate through the EDEM post-processing module,and obtain the optimal length of the working surface of the network chain through the analysis results.The size is 2.8m,and the separation effect of the falling soil conveying components designed in this paper is also verified.(5)Through the test bench,the soil drop rate and the leakage rate are used as indicators,and the linear speed of the net chain,the angle of the net chain,and the vibration height are used as the test factors.On this basis,the Box-Behnken response surface of the Design-expert software is selected.method to design the experimental program.The optimal working parameters determined by the test are the linear speed of the net chain of 0.9m/s,the angle of the net chain of 46°,and the vibration height of 20 mm.