箕斗定量装载系统缓冲仓的强度和稳定性分析

Strength and stability analysis of surge bunker in skip loading system

缓冲仓是箕斗定量装载系统中的关键部件,物料的不同载荷作用将导致缓冲仓发生破坏。文章根据承载能力极限状态和壳体薄膜理论研究缓冲仓的强度和稳定性条件,通过ANSYS Workbench研究缓冲仓的应力分布状态,利用Linear Bucking模块对缓冲仓进行线性屈曲分析。结果表明:缓冲仓的最大等效应力并不是位于筒仓最底部与环梁相接处,而是距离环梁约1.8 m处,此处引起仓壁应力的急剧变化,产生"象腿"破坏现象;缓冲仓发生结构屈曲破坏主要由径向大变形引起,随着储料载荷的增大,结构在发生屈曲破坏前已出现强度破坏,缓冲仓的主要破坏形式为强度破坏。

In traditional skip weight-fixed loading system,in order to improve the coal-stagnating and the coal＇s impact effect on skip,a surge bunker is designed on top of hopper. Surge bunker is a key component in skip loading system,and different loads from materials will lead to structural damage.Therefore,according to limit status of bearing capability and membrane theory of shells,strength calculation and stability analysis of surge bunker is studied. Thereafter,bunker ＇s stress distributing state is conducted with ANSYS Workbench,and based on the results,the linear buckling analysis is carried out by employing the linear bucking module. The results show that the maximum stress of bunker has certain distance from ring beam which is not located in the joint of bottom and ring beam,and the rapidly change of stress leads to the ＂elephant foot＂damage. The yield bending damage is caused by radial deformation,and with the increase of load,the strength destroy has produced before yield bending damage,which identify the major failure of surge bunker is strength failure.