Abstract: Research work on maize is always limited by the short harvesting period and the high labor intensity of harvesting. The pressure feed wheels in the maize peeling device are made of rubber and can deform greatly in practice, making it difficult for ANSYS and EDEM software to build a flexible working simulation model for them. In order to address the above problems, a flexible simulation model of the maize peeling device is established in this paper by coupling EDEM and RecurDyn. The simulation is based on three operating conditions with peeling roll and press wheel speed as test factors. The results show that when the speed of peeling roller is 480 r/min, the speed of pressure feed wheel is 96 r/min, and the feeding speed is 500 kg/h, the average force of corn cob is 15.65 N, the variance of the force is 7.80, and the rotation speed of cob around its own axis is 58.86 r/min, which is the most stable force and fast rotation speed of corn under the working condition. With the cob peeling rate, seed drop rate and kernel breakage rate as the test index for bench test to verify the simulation, when the peeling roller speed of 480 r/min, the pressure feed wheel speed of 96 r/min, feeding speed of 500 kg/h, the cob peeling rate of 90.22%, the seed drop rate and kernel breakage rate of 0.97% and 1.07%, peeling rate at the same time, the drop rate and kernel breakage rate of lowest. Breakage rate were the lowest, and the experimental and simulation results coincided with each other. This study shows that the use of EDEMRecurDyn coupling to establish a discrete simulation model of the corn peeling device can provide preliminary guidance for the subsequent test work of the corn peeling device, with compressing the test time and reducing the labor burden.

Key words: maize peeling device, discrete element method, EDEMRecurDyn coupling simulation, flexible models, bench tests

摘要： 玉米适收期短，收获劳动强度大，有关玉米的研究工作总是受这两点限制。玉米剥皮装置中压送轮为橡胶材质，在实际工作中会发生很大的变形，ANSYS与EDEM等软件很难对其建立柔性化的仿真模型。针对以上问题，采用EDEMRecurDyn耦合的方式，建立玉米剥皮装置柔性化仿真模型，以剥皮辊及压送轮转速为试验因素进行试验，结果显示，当剥皮辊转速为480r/min、压送轮转速为96r/min，喂入速度为500kg/h时，玉米果穗平均受力为15.65N，受力的方差为7.80，果穗绕自身轴线的转动速度为58.86r/min，此工况下玉米受力平稳且有较快转速。以果穗剥净率、落籽率及籽粒破损率为试验指标进行台架试验对仿真结果展开验证，当剥皮辊转速为480r/min、压送轮转速为96r/min，喂入速度为500kg/h时，果穗剥净率为90.22%，落籽率和籽粒破损率分别为0.97%和1.07%，试验结果和仿真结果相吻合。此研究表明利用EDEMRecurDyn耦合建立玉米剥皮装置离散仿真模型，可为此后玉米剥皮装置试验工作提供前期指导，节省试验成本，减轻劳动负担。

关键词: 玉米剥皮装置, 离散元, EDEMRecurDyn耦合, 柔性化模型, 台架试验