Bionic Design And Experimental Analysis Of Cutting Blade For Branch Shiver

With rich forest resources in China, produce a large number of forestry residuesand garden waste every year. However, the traditional processing method is still tobury and burning, simple and crude. It is neither safe, nor environmental protection,and also violates the principles of sustainable development strategy. Therefore, how todeal with these residues is a very important problem at present. Nowadays, the mainutilization ways are biomass energy, organic mulch or compost, production of rawmaterials etc. The realization of these must go through a core link, crushing offorestry residues or garden waste. Cutting blade as shiver is one of the corecomponents, its performance directly affects the performance of shiver. In this study,the geometry of cutting blade was changed to reduce existing cutting resistance orimprove the wear resistance, and finally improve the performance of shiver.In recent years, with the rapid development of bionics, many scholars have thenature clever structure applied to the production and living, to solve many previoustechnical difficulties and promote the rapid development of science and technology.Many scientific research institutions and colleges have conducted the thoroughresearch to the animal claw cutting behavior (Most of the soil cave animals, such asant, Geotrupidae, mice etc). Studies have shown that animal claw toe’s inner andoutter contour curve has the characteristics of curvature fluctuations, and they thinkthis contact surface of soil has lower cutting resistance in the process of cutting soil.In the study, according to the characteristics of the incisors outline of thebeaver, design three kinds of bionic blade. Bionic blade A: flank is the surfacebased on outer contour curve fitting equation of beaver lower incisors expanded2times curve as conducting wire. Bionic blade B: flank is the surface based on aparabola as conducting wire; Bionic blade C: flank is the surface based on circular arcof R75mm as conducting wire.Establish mechanical model of cutting branches, and calculate the cutting forcein theory. Then, perform static analysis for ordinary blade and bionic blade by the finite element software ANSYS. Analysis shows that stiffness and strength of theordinary blade and bionic blade meet the requirements.In the study, the performance of ordinary blade and bionic blade is mainlyexplored from the following aspects.(1) Cutting along the grain at low speed. In the correlation verification test, weinclude that Cutting speed and cutting resistance is not significant, but branchdiameter, branch length and cutting resistance is significant. In the contrastive test,Experimental analysis show that the performance of the bionic blade are higher thanthe ordinary blade with greatest cutting resistance, average cutting resistance, powerconsumption index. By comprehensive consideration, the performance of the bionicblade A is optimal, the second is the bionic blade B, and the most of time is bionicblade C.(2) Branch crushing test. Select blade type, branch diameter and water content astest factors, and the maximum strain, the average peak strain as test index. The testresults show that cutting strain has increasing trend with the increase of diameter, andcutting strain reduced by10.21%~34.70%compared the moisture content of38.34%wt branches with the moisture content of14.22%wt branches. Bycomprehensive consideration, performance of Ordinary blade is lower than bionicblade, bionic blade A is slightly better than bionic blade B, and performance of bionicblade C is the worst. Analysis of variance by SPSS statistical software finds that bladetype, branch diameter and branch water content have a significant effect on cuttingresistance.Above (1) and (2) of the two tests are consistent with the results, application ofbionic technology in the cutting blade, indeed reduces cutting resistance, so as toimprove production efficiency of the shiver and service life of the blade.