青砂岩破碎过程中冲击高度与时间关系的数值模拟分析

Numerical Simulation of the Relationship between Impact Height and Impact Time of Green Sandstone Crushing Process

冲击速度及时间是破碎机设计过程中的重要参数。为优化破碎机的工作参数,降低能耗及提高效率,以青砂岩为研究对象,运用工程仿真软件ANSYS-Workbench对青砂岩的冲击过程进行瞬态分析,研究不同下落高度下的岩石冲击时间。结果表明,青砂岩冲击过程的加速度变化可分接触前不变、迅速增大、缓慢减小及接触后不变共4个阶段;青砂岩的冲击时间较短,一般为毫秒等级,且随下落高度的增大而增长。该结果对破碎机设计优化具有理论指导意义。

Impact velocity and time are important parameters for the crusher.In order to optimize the working parameters of the crusher,reduce energy consumption and improve efficiency,this paper took the green sandstone as the research object,simplified the simulation of the impact model,and used the engineering simulation software ANSYS-Workbench based on finite element analysis to carry out the transient analysis of the impact process of the green sandstone,and studied the rock impact time under different falling heights.The results show that the change of acceleration during the impact process of green sandstone can be divided into four stages of the unchanged stage before contact,the rapid increase stage,the slow decrease stage,and the unchanged stage after contact;the impact time of green sandstone is short,generally millisecond,and increases with the increase of falling height.The results have certain theoretical guiding significance for the design optimization of crusher and other machinery.