全封闭带式输送机返料装置返料性能仿真试验研究

为揭示小麦颗粒在全封闭带式输送机返料装置中的运动规律和返料性能,为返料装置的结构优化提供理论指导,开展了全封闭带式输送机返料装置返料性能仿真试验。采用离散元软件EDEM和Hertz-Mindlin颗粒接触模型建立了多球元叠加小麦颗粒模型和返料装置离散元仿真模型,对小麦颗粒群在返料板作用下的运动规律进行研究;以颗粒返回率为评价指标,返料板倾斜角、带速为考察指标进行二因素四水平仿真正交试验。结果表明:颗粒群在返料板的推动作用下呈现4种运动方式;返料板倾斜角是影响评价指标的主要因素,带速是次要因素;返料板倾斜角0°和带速3.5 m/s为最优组合参数,此条件下颗粒返回率为43.76%;较小返料板倾斜角有利于返料板携带走更多的颗粒和减缓改向滚筒底部颗粒堆积;颗粒返回率与带速呈正相关关系,较高带速可以提高颗粒返回率。研究结果揭示了返料装置返料机理以及返料性能的影响规律,可为返料装置的结构优化提供理论指导。

Simulation test of returning performance of returning device forfully enclosed belt conveyor

In order to reveal the motion law and the returning performance of wheat granules in the returning device for fully enclosed belt conveyor, and to provide theoretical guidance for structural optimization of the returning device, the simulation test of returning performance of returning device for fully enclosed belt conveyor was carried out. A multi-sphere superimposed wheat particle model and a discrete element simulation model of the returning device for the belt conveyor were established by using the discrete element software EDEM and Hertz-Mindlin particle contact model. The motion law of wheat granules under the action of returning plate was studied. Two factors-four levels orthogonal experiment was performed with the particle return rate as an evaluation index and the inclination angle of returning plate and belt speed as factors. The results showed that the granules presented four kinds of motion modes under the push of the returning plate. The inclination angle of the returning plate was a main factor affecting the evaluation index, and the belt speed was a secondary factor. The inclination angle of returning plate 0°and the belt speed 3.5 m/s were the optimal combination parameters and the particle return rate was 43.76% under these conditions. Small inclination angle of the returning plate was beneficial to the returning plate to carry more particles and reduced the accumulation of particles at the bottom of the roller. The particle return rate was positively correlated with the belt speed, and high belt speed could increase the particle return rate. The results revealed the return mechanism of the returning device and the influence law of the returning performance, which provided theoretical guidance for the structural optimization of the returning device.