Research On Lightweight Of Key Parts Of 1000T Wheel-Type Girder Hoister

The proportion of bridges and beams in the existing high-speed railway lines of our country is relatively large.With the development of "eight vertical and eight horizontal" railway network,there are more and more high-speed railway sections that need to pass through mountains,rivers and valleys,and there are more and more situations that need to set up bridge viaducts.The development of 40 m simply supported beam can reduce the number of piers,accelerate the construction speed,improve the stability,and reduce the cost of capital construction.Therefore,the development and research of 40 m span 1000 T wheel-type girder hoister has great significance.In engineering,the design of the major girder hoisters has the situations of redundant structure and waste of materials.The steel structure of the main frame of the girder hoister accounts for more than 60% of the total weight of the whole machine.It is of great significance to study its structural design and lightweight for reducing the load of the whole vehicle,reducing energy consumption,improving efficiency and reducing pollution to the environment.In this paper,according to the complexity of the structure,three algorithms are used to study the lightweight of the key structural components of HLT 1000 T wheel-type girder hoister.The specific work and optimization results are as follows:(1)The finite element modeling and modal analysis are carried out for the main beam of 1000 T wheel-type girder hoister.The strength and rigidity of the main beam mechanical structure meet the requirements,but the redundancy is large,so the optimization design is needed;therefore the multi-objective optimization strategy is proposed which is based on the genetic algorithm,for the optimization design of the main beam structure;the comparison analysis before and after the optimization shows that the dead weight is reduced by 9.4%.(2)The finite element modeling,static analysis and harmonic response analysis are carried out for the cross beam of 1000 T wheel-type girder hoister.In order to meet the requirements of structural strength and rigidity,the optimization technology based on fish swarm algorithm is proposed to optimize the cross beam structure.After optimization,the dead weight is reduced by 15%.(3)The finite element modeling,statics analysis and fatigue performance analysis are carried out for the outrigger of 1000 T wheel-type girder hoister,an optimization method based on simulated annealing algorithm is proposed to optimize the mechanical structure of the outrigger;after optimization,the weight of the outrigger is reduced by 10%,which meets the requirements of structural strength and rigidity.The key structure of HLT1000 T wheel-type girder hoister is analyzed by finite element method and objective optimization,and the better optimization result is obtained.The reliability of the key structure is proved by the field debugging and testing monitoring the operation state of each structure of the girder hoister.It provides a reference for the improvement and optimization of the structure of the subsequent girder hoister and other construction machinery.