非规则外形内聚颗粒模型的构建及其破碎能分析

摘要

Considering the mineral irregular shape,mineral inside different components and mechanical properties among different components,a multi-scale irregular shape cohesive particle model was built with discrete element numerical analysis method,the discrete element software EDEM and its secondary-development.Using the particle model,the energy consumption characteristics of shear extrusion crushing process in crusher were analyzed.The results show that the crushing energy is closely related to the loading mode of shearing extrusion crusher.When the inner cone's vibration frequency is constant,the crushing energy is larger with the outer cone's rotational speed becoming faster.When the outer cone's rotational speed is constant,the crushing energy is larger with the inner cone's vibration frequency becoming higher.The more minerals are broken,the greater the crushing energy is,and the greater the mineral crushing rate is,the faster the crushing energy grows.While the mineral crushing rate is reduced,the crushing energy decreases.%考虑矿石的非规则外形、内部不同组分及其之间的力学特性,基于离散元数值分析方法、离散元软件EDEM及其二次开发,构建一种多尺度非规则外形内聚颗粒模型;利用颗粒模型在剪切挤压破碎机中对矿石破碎过程的破碎能耗特性进行分析.结果表明,破碎能与剪切挤压破碎机的加载方式有密切关系,在内锥振动频率一定时,外锥的转速越快,破碎能越大;外锥转速一定时,内锥振动频率越高,破碎能越大;矿石破碎越多,破碎能越大;矿石破碎速度越大,破碎能增长越快;矿石破碎速度减少,破碎能随之减小.