| Stationary belt loaders are widely used in handling bulk materials.However,the fixed belt loader occupies a large area and can not be flexibly transferred,which leads to the slow improvement of the handling efficiency of bulk materials in the process of railway transportation.Most railway yards still use the combination of pocket loader and manual handling when carrying out bulk material handling up to now.Not only is handling inefficient,but the cost of human resources is high.Traditional handling mechanism has been unable to meet the increasing needs of bulk material handling.There is an urgent need to design a high efficiency,scalable,rotatable,mobile bulk material handling machine to meet the needs of today’s society.Taking ZXCZYD-720 simple handling machine as the prototype,according to the work needs and site restrictions,the overall scheme of handling device is designed and each key parameter is determined,so that the designed handling equipment has the characteristics of telescopic,rotatable,movable and high efficiency,then the overall layout of the charging crane is analyzed and compared to choose the optimal plan.After that,the main working parts of the structure of the detailed design.Using Rankine earth pressure theory and relevant knowledge of material mechanics,the mechanical analysis of the working load of each main working parts is carried out.Modal analysis was carried out on the handling telescopic boom,and the rationality of low-frequency resonance and structure was verified by simulation results.Transient dynamic simulation was carried out on the feeding telescopic boom to verify its dynamic structure strength.After the completion of the finite element correlation analysis of the main working parts,the parameters of the upper/lower telescopic boom were optimized by response surface method.After optimization,the transverse strength of the loading telescopic boom is optimized,the maximum stress is reduced by 7.26%,and the total mass is reduced by 22.79%.The stiffness and strength of the telescopic arm are enhanced,the maximum deformation is reduced by 15.72%,the maximum stress is reduced by 18.8%,and the maximum mass is reduced by 5.45%.The structure and mass of the rotating support frame were optimized by topology optimization,and the maximum mass was reduced by 41% while the strength and stiffness were basically unchanged.Finally,the discrete element analysis software is used to verify whether the machine can meet the actual requirements of bulk material handling.In the process of simulation,a large number of materials fall in the middle conveying arm.Through theoretical analysis,the structure of the middle conveying arm is innovated and optimized,which can fully meet the requirements of material transport after simulation verification.Verification of loading and unloading efficiency can meet the technical requirements and achieve higher efficiency.After the completion of the innovative design and simulation of the loading and unloading device,the results can meet the actual needs,and then start the prototype manufacturing. |
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