Simulation Of Loading Process Based On EDEM

The loading resistance is a reaction force of the material shovel bucket in the loading process, it includes two portions of a inserting resistance at the bucket level insert stage and the scooping resistance at the upgrade level. The presence of loading resistance, the first is to affect the loading efficiency, the second is to affect the energy consumption and bucketing costs, so it has important practical significance to load the research about the resistance of the formation mechanism. The development of the discrete element theory for the study of the mechanism of action of machinery-scattered particle system provided a theoretical basis and achieved some results. This paper is based on the discrete element theory, use the discrete element software EDEM to establish stockpiles of materials, import bucket model according to the material properties, thereby establish the simulation model of the loading process, and utilize the orthogonal experiment method to design simulation program and achieve the bucketing operations simulation. Through simulation, first to do the intuitive analysis for the materials motion characteristics on the bucketing job, clarify the impediment on bucket of the material deformation; Secondly, to study the influence on the loading resistance formation of some factors, such as material particle size, the material heap high and the bucket wide loading resistance, etc. Then to analyze the changing characteristics of the loading resistance under the influence of different factors, and obtained the following conclusions:(1) The simulation model established is reasonable and practicable. Put the bucket model into windrow model which established by using EDEM software to achieve the whole process of bucketing materials simulation. Simulation results are close to the empirical formula, soil mechanics derivation formula and the test results of the related scholars. The consistent trending verify the correctness of the simulation model;(2) It can observed visually to the presence of dense-core and shear slip plane. Analysis by the characteristics of the movement of materials, and combined with software screenshots, found that the dense-core is in the status of continuous generation also continue to disrupt; for shear slip planes, the larger the particle, the more obvious it reflects;(3) By dealing with the data of the simulation results further, we found that it can use exponential formula to express the relationship between the insertion resistance which produced in the processing of the bucket horizontal insertion and the insertion depth;(4) Through the simulation of three single factor analysis, we found that the loading resistance is not a linear relationship with the changes of the materials particle size, the material stack height and the width bucket, but behave in a non-linear characteristics; (5) By doing four factors and three levels orthogonal experiment, the effect of the insertion depth and particle size on the insertion resistance is bigger than the material stack height and bucket width.(6) By using several group of simulation data, do the regression fit in matlab, to get the relation formula between the insertion resistance and particle size, piled height, bucket width and insertion depth.