Design And Experimental Study Of Corn Straw Rind-pith Separation Device

Corn stalks as an important biomass energy,are not effectively used and abandoned or incinerated,not only polluting the environment,but also wasting resources.How to efficiently utilize these legacy crop resources is a problem that needs to be addressed.Corn stalk,which contains more lignin and cellulose,can be used as a raw material for making paper.Its flesh is rich in crude protein and coarse fat,which can be used as the raw material for good animal feed and wine.In order to make the use of the corn straw resource utilization maximization,the reasonable and effective separation must be made.In this paper,through analyzing the material properties of maize straw and on the basis of previous studies,we design a corn straw rind-pith separation device,and experimental study on the feasibility of the device,its main research contents and conclusions are as follows:(1)Corn straw rind-pith device the overall design and working principle device.The device consists mainly of two parts:the feeding device and the shear device.Feeding device is mainly on the straw compression and cross cutting action,in the process of the compression of the difference of material properties for corn stalk skin crumb making straw skin produce plastic deformation between flesh,cause skin crumb junction partly separation phenomenon;Cross cutting process,the type of blade tooth blade when entering and leaving the straw,not only destroyed the tooth edge of corn stalk skin pulp state,more driving around the skin of the straw,straw skin around the damaged tooth blade crumb combining with the state,further expanded the degree of separation of the stalk.The main function of the shearing device is to separate the partial separation of the stalks from the cutting and cutting of the cutter.(2)Structure design and finite element analysis of key parts of feeding device and shearing device.The structural design of the feeding device includes adjusting mechanism,a feeding roller,design and tooth type blade parts,the mechanism design of shearing device mainly includes blade,knife,knife shaft and other parts of the design.using the actual modeling 3D modeling software,the parts,and with the help of the software ANSYS for finite element analysis of key components of the feeding device and shearing device,the analysis and calculation of the mathematical system,the static analysis of key parts the feeding device and shearing device,the typical working conditions of the stress distribution,deformation characteristics,check the key parts of the strength and deformation,the results show that the strength and deformation of the key parts in the typical working conditions are within a reasonable 0range,provides a theoretical basis for the manufacture of the feeding device and the shearing device.(3)Experimental study on corn straw rind-pith separation device.The use of corn straw pulp device test-bed is designed in this paper,through the analysis of preexperiment and theory,selected factors have great influence on the separation effect of corn straw pulp:feed roller speed、upper and lower feed roll tooth spacing,cutter speed.With the above three factors as the experimental factors,the separation rate and uniformity were evaluated.The test results show that the feed roller speed,and cutting speed are backlash has significant effect on the two evaluation indexes,the backlash and interaction of cutting speed has a significant influence on the separation rate,the interaction of the feeding roller speed and cutting speed have significant influence on the uniformity.The optimal combination of parameters of corn straw pulp separation device designed in this study is:when the feeding roller speed 393r/min,tooth clearance is 5.86mm,cutting speed is 925r/min,the separation rate is 85.71%,evenness index is 85.31%.