Authors

Abstract

Castor is one of the important oil crop, the shelling process of which directly affects the quality of castor seeds. In the process of shelling, the shelling force of castor is an important index to study its damage. The castor capsule model was established and the shelling test machine was established based on the discrete element method. Then the extrusion law of castor capsule during shelling was analyzed. The shelling process is divided into three stages, which are the Initial stage, stable shelling stage and the final stage. The force law of shelling process is analyzed. The results show that with the increase of rotating speed, the maximum force decreases from 68.78 to 68.10 N, the maximum speed increases from 8.92 to 12.99 m/s, the force of inner drum increases from 509.34 to 533.14 N, and then decreases to 456.15 N. The shelling increases from 91.23% to 91.28%, and then decreases to 88.89%. With the increase of filling amount, the maximum force increases from 55.86 to 76.93 N, the maximum speed decreases from 12.99 to 10.86 m/s, the force of inner drum increases from 338.58 to 603.364 N, and the shelling rate changes from 91% to 90.05%. This study can provide theoretical support for the design of castor shelling machine.

Abstract in Chinese

蓖麻是重要的油料作物，其脱壳过程直接影响蓖麻种子的质量。在脱壳过程中，蓖麻的应力规律是影响损伤的重要指标。基于离散元方法，建立了蓖麻胶囊和脱壳试验台的仿真模型，研究了蓖麻胶囊的挤压规律和脱壳过程。该过程分为三个阶段，即开始阶段、稳定阶段和结束阶段。分析了三个阶段的脱壳过程和应力规律。结果表明，随着转速的增加，最大压力从68.78 N降至68.10 N，最大转速从8.92 m/s升至12.99 m/s，内筒应力从509.34 N升至533.14 N，然后降至456.15 N，脱壳率从91.23%升至91.28%，然后降至88.89%。随着装填量的增加，最大压力从55.86 N增加到76.93 N，最大速度从12.99 m/s降低到10.86 m/s，内筒应力从338.58 N增加到603.364 N，脱壳率从91%变为90.05%。本研究可为蓖麻脱壳机的设计提供理论支持。