Abstract

In order to solve the problem of low shelling efficiency and high damage probability of rubber nut, a compound rubber nut sheller was designed and tested. The sheller was consisted of extrusion device, screening device, collecting device and transmission device. Applying the principle of extrusion and impact, the sheller was researched with single factor experiments and enhanced its versatility by being capable of changing the spacing of the rubber nut extrusion area. It was found that the shelling rate and kernel damage rate increased with the increase of motor speed and material hardness of extrusion roller, and decreased with the increase of extrusion clearance. The regression orthogonal design method was applied to carry out the rubber nut shelling test. The mathematical model of the rubber nut shelling rate, the kernel damage rate, the motor speed, the material of the extrusion roller and the extrusion clearance was established with MATLAB. The optimal working parameters were solved by response surface analysis and Linear Solver algorithm. The test results show that when the motor speed is 700r/min, the extrusion clearance is 30mm and the extrusion roller material is Q235, the shelling rate is 89.2% and the kernel damage rate is 6.63%. This rubber nut sheller has the advantages of simple structure and convenient operation, which can promote the development of rubber nut comprehensive utilization industry.

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