Structural Analysis And Optimization Of Working Device For Large Mining Crusher

Excavator is a common engineering machinery in many construction projects,such as highway construction,mine mining,road construction and so on.The universality and versatile application of the excavator is obvious to all.The standard working device of the excavator is a bucket for digging.But it is not to excavate all the forms of work,such as breaking rock,crushing,punching,shovel can't complete the work,the work device used as a broken hammer.Most of the existing crusher is reformed by the excavator.Because of the working nature of the broken hammer,the working device of the whole excavator is in the action of vibration and great impact force,and the crack and even fracture appear,and the fatigue failure occurs.In view of this,according to the problem of short fatigue life of the working device of a heavy mining crusher produced by a excavator plant,the performance of the working device of this type of crusher is studied.(1)According to the working direction of the drill rod of the crusher,three modes of attitude are selected,and the force of the hinge points of the boom and the bucket arm in each working condition is calculated,and the force of the joints of each hinge is obtained.The finite element software ANSYS is used to analyze the statics of the boom and the bucket arm of each working condition,and the static characteristics of the boom and the bucket arm are studied from the stiffness and the strength,so as to verify whether the deformation and stress of the boom and the bucket arm the three operating conditions meet the requirements.(2)Due to the impact vibration of the hammer,the whole working device is under high frequency vibration,so it is very necessary to carry out dynamic analysis.Through modal analysis,the first six natural frequencies and corresponding vibration modes of the boom and bucket arm are obtained,providing reference for the frequency matching of the crusher engine and the hammer.Multiple positions are selected on the boom and the bucket arm,and the harmonic response of the boom and the bucket arm of the three working conditions is analyzed,and the corresponding response curve of the displacement frequency is obtained,and the amplitude characteristic is analyzed to provide the basis for avoiding the resonance phenomenon.(3)The fatigue life of the boom and bucket arm under three working conditions is estimated by using the finite element method,and the shortest life and the shortest fatigue life are obtained.In order to prolong the fatigue life of the working device of the crusher,the structure is optimized and optimized,so as to achieve the desired effect.In this paper,the finite element method is applied to the static and dynamic analysis of the key parts of the crusher working device,the fatigue life of the boom and the bucket arm is estimated,and the fatigue life of the whole working device is improved by the structure improvement.