Static And Dynamic Characteristics Analysis And Lightweight Research Of Key Structure Of Spreader

With the promulgation of national policies such as "energy-saving and emission reduction" and "mine reclamation",as well as the development of open-pit mining transportation equipment to the direction of mega-scale,green and intelligent,spreader has become a piece of indispensable in continuous or semi-continuous high-efficiency mining technology.However,the domestic theoretical design of the spreader is not perfect,and the lightweight research on the key structure of the whole machine needs to be carried out urgently.This paper analyzes the load conditions of the spreader,adopts the topology optimization method to carry out the lightweight design of the key structures such as the receiving boom,the discharge boom and the tower,and establishes an optimized virtual prototype of the whole machine to verify the rationality of the lightweight of the spreader.Firstly,taking a mine spreader as the research object,the load analysis of its working condition is carried out.The main load of the spreader is divided into three categories: deadweight load,additional load and seismic load.Typical working conditions can be divided into three types: no-load condition,rated load and wind load combination condition and rated load,wind load and seismic load combination condition.Secondly,the established solid model of the spreader machine was imported into ANSYS Workbench to analyze the strength,stiffness and modal performance of the key structural parts of the rock dumping machine,such as the receiving boom,the discharging boom and the tower.The analysis results show that although the maximum stress and deflection deformation values of the receiving boom,the discharging boom and the tower are within the safe range,the abundance is relatively large and there is a large room for optimization.Based on the topology optimization theory of the variable density method,the topological lightweight design of the spreader’s receiving boom,discharge boom and tower was carried out.Based on the topology optimization results,the optimized entity model was established,and the optimized structure was checked by the finite element method.The analysis results show that compared with the key structural parts of the rock discharge machine before optimization,its weight is reduced by about 4.5%;although the maximum stress value and deflection deformation value are slightly increased,they still meet the safety allowable value.Besides,the low order modes of the receiving boom and the discharge boom avoid the inherent excitation frequency of the internal dynamic mechanism,which effectively inhibits the occurrence of resonance risk.Finally,the optimized model of the whole machine was established,and the finite element check was carried out based on the worst working conditions.It is concluded that the maximum stress and deflection deformation meet the requirements of use,which verifies the rationality of the lightweight design of the receiving arm,the discharging arm and the tower.The weight of the final receiving boom was reduced by 1792 kg with a weight reduction ratio of 5.0%;Discharging boom weight reduction 1081 kg,weight reduction ratio is 4.1%;The weight of the tower was reduced by 1777 kg,with a weight reduction ratio of 4.5%,and a good lightweight effect was achieved.Through the lightweight research of the key components,the weight of the spreader is reduced,which not only reduces the loading power of the power mechanism,reduces the production cost of the equipment,but also reduces the ground specific pressure of the spreader to a certain extent,and improves the safety of the spreader.It provides an efficient and reliable method for the structural optimization design of a large self-moving spreader.