Research On The Optimal Design Of The Main Beam Of Overhead Crane And Its Scale-Down Model

As a kind of heavy lifting machinery,overhead crane plays an important role in modern manufacturing,logistics industry and engineering construction.With the development of large-scale and professional construction cranes in the future,huge metal structures will inevitably face many technical problems caused by "limit" design in the design process.The emergence of model test methods has solved the problems of high test cost and long test cycle in the design process,and has been widely used.However,in previous studies,the effect of small-size distortion on similarity in complex structures has rarely been discussed by designing scale-up models for full-size models.In this regard,this paper takes the main beam structure of the overhead crane as the research topic,takes the similarity theory as the means,studies the scale-down model,and designs a scale-down model with a high degree of similarity,so that the scale-down model replaces the prototype for relevant experimental research.Firstly,the structural analysis of the box-type main beam of the overhead crane is carried out,and the optimization program is used to optimize the design of the main beam,and the optimized main beam size that meets the requirements is obtained with the highest economic type as the main purpose under the premise of meeting the strength and rigidity;Secondly,based on the similarity theory,the main beam parameters of the overhead crane are selected according to the optimized main beam structure size,and the similar scale of the box beam of the overhead crane is derived.Aiming at the problems of stiffness degradation and partial structural distortion of the scaled model,multiple scaled models are designed by the compensation model method to improve the similarity and determine the most suitable scaled model.Finally,the mechanical similarity of the scaled model is verified by static analysis of the scale model by finite element calculation,and the life similarity of the scaled model is verified by fatigue life analysis.The main purpose of this study is to establish a method system for efficient crane scale model design to achieve more accurate and reliable model experiments.It is of great significance to improve the design and development level of heavy-duty cranes,and also provides reference for model experiments in other fields.