Optimization Design And Experiment Of Flexible Compound Rubber Seed Sheller

The potential value of rubber seed shell,kernel and meal is huge,but there is a lot of waste of rubber seed in Hainan,and there is a lack of effective industrial processing methods,especially the lack of efficient mechanical shelling equipment.This topic takes the rubber seed in Danzhou area of Hainan Province as the research object.By studying the geometric parameters and shelling process of rubber seed,the working principle of flexible composite rubber seed shelling is established.The key components of flexible composite rubber seed shelling machine are designed and analyzed,and the structure size is determined.The physical prototype of shelling is trial produced,and the performance test of shelling effect is carried out to verify the feasibility of its shelling structure reliability.The main research content includes:(1)The distribution and mean value of the basic physical characteristics of rubber seed shell thickness,three-dimensional size,ball degree and moisture content of wet base were analyzed.The rubber seed shell of the edge is thick,the top is the second,and the transverse part is thin.The three-dimensional dimension of rubber seed is the largest in longitudinal dimension,followed by transverse dimension,smallest in edge dimension and0.845 in average spherical size,which is ellipsoid.The average moisture content of rubber seeds was 31.89%.The elastic modulus of rubber seeds was 193.25 Mpa by mechanical test of rubber seeds.It was found that there were differences in shell compression stiffness at different positions of rubber seeds.The average breaking force of rubber seeds in flexible double roll structure was 456.68 N.The results show that the size of rubber seed has the greatest influence on the crushing force.In the study of the separation mechanism of rubber seed shell,it is concluded that the rubber seed shell is more easily shelled by the effect of multiple concentrated forces,and the crack propagation force of rubber seed shell is 63.31 N.The results provide the geometric basis and theoretical basis for setting the parameters of the shell structure of the rubber seed sheller.(2)The working mode and space layout of the frame,shelling device and screening device of the flexible compound rubber seed sheller were determined.At the same time,in order to improve the working stability of the flexible compound rubber seed sheller,the frame structure of the machine is improved by using the finite element modal analysis method.(3)According to the physical and mechanical characteristics of rubber seeds,the flexible double roll structure and the flexible belt rubbing extrusion shelling structure are designed.The stress of rubber seeds in the shelling structure is analyzed,and the structural parameters to ensure the rubber seeds can enter the shelling structure are obtained.The structure is checked by Adams dynamic simulation analysis,and the reliability of the flexible composite shelling structure is verified.(4)In order to verify the performance of the flexible compound rubber seed sheller,the working parameters of the prototype are optimized.The best working parameters of the rubber seed sheller were obtained by Box-Benhken prototype test.The flexible double roll gap was 15 mm,the working area gap of the upper and lower flexible belt was 17 mm,the speed difference between the upper and lower flexible belt was 0.14m/s,and the shelling rate of rubber seeds reached 82.5% and the seed kernel breaking rate was 11.5%.It can meet the basic requirements of mechanical shelling of rubber seeds,and provide theoretical basis and technical support for the research of rubber seed shelling mechanization.