基于EDEM的颚式破碎机内物料破碎行为研究

Study on Material's Breakage Behavior in a Jaw Crusher Based on EDEM

在目前颚式破碎机的设计工作中,电机功率的选择主要以经验计算为主,常有计算功率较之需用功率偏大或偏小的现象发生。为分析破碎机在破碎物料过程中功率的变化规律,使用离散元软件EDEM(Engineering Discrete Element Method)建立物料及破碎机的离散元模型。对岩石试件进行点载荷试验,得到其抗拉强度,并在EDEM中模拟物料的压缩试验,对物料BPM(Bonded Particle model)模型参数进行标定,使物料的破碎行为与真实岩石保持一致。在实验室用颚式破碎机内进行岩石的破碎工作,并记录破碎机的功率变化规律,与模拟物料破碎得到的功率变化曲线进行对比,发现两者基本吻合,得到的功耗数据可为电机的合理选择提供一定的参考。

At present, the option for the dynamo when designing a jaw crusher is done by empirical calculation and it can be often found that the calculated power is not consistent with the required power. In order to analyze the crushing power of the crusher, the discrete element models of the material and the jaw crusher were set up respectively using a kind of software named EDEM （Engineering Discrete Element Method）. In order to make the breakage behavior of the material model remain similar to the real rock, the tensile strength of rock samples was determined by point load testing and compression tests of the material model were carried out in EDEM to calibrate the bond parameters. A jaw crusher used in a laboratory was used to fracture the rocks and the varying power of the crusher was recorded, which was compared with the power variation curve obtained by simulating the breakage behavior of the material and it was found that the two curves agreed with each other basically. The obtained data on the power condition of the crusher could serve as the basis for the rational selection for the dynamo.