Digital Design Of Mechanical System For Efficent Gantry Crane Apply To Rail-road Combined Transportation

At present,gantry cranes are indispensable equipment in logistics transportation in China.The reloading of goods mainly depends on large and medium-sized cranes to upgrade and transfer goods.With the rapid development of economy,Gantry cranes are playing an increasingly important role in the rail-road combined transportation and rail transport hubs along the“Belt and Road”countries.China’s crane industry has developed rapidly and has become the world’s largest exporter of small-tonnage cranes.However,our large tonnage cranes are not competitive.In response to the strategy of "Belt and Road",we will speed up the interconnection of inter-regional infrastructure,and design gantry cranes with large tonnages,large spans,and high lifting heights so as to improve the efficiency of rail transit.This paper aims to deal with the current problem of low efficiency of cargo marshalling yards and theprominent safety hazards,and the current technical difficulties(e.g.,high-efficiency connection between cargo transportation methods).To the crane with the weight of 40 t and the span of 30 m as the object,uses the developed CAD/CAE technology,makes digital design and manufacture,effectively reduces the weight of the loading and unloading machine and sling on the premise of satisfying the lifting function,which greatly save energy.This paper mainly focuses on the following aspects:(1)Make structural design of gantry cranes based on non-ferrous metal materials,analyze the composition and characteristics of metal structures,select suitable materials,and make reasonable structural layout,to ensure the stability of gantry crane mechanical system.By optimizing the design of the crane trolley rotation device,its total quality is reduced,and its operability and work efficiency are improved.(2)Based on the structure and work characteristics of gantry cranes,it discusses the establishment of elastic mechanical models for gantry cranes and the simplification of model processing in the finite element solution process.A simple three-dimensional model of gantry cranes was established through CATIA.Combined with the practical experience of gantry crane in the past,the actual experience of the crane in the dangerous working conditions is analyzed.The load of the crane isanalyzed and calculated in consideration of actual conditions of project to effectively restrain the model.(3)The finite element method is used to solve the model,and a 20-node spatial unit is proposed as the basic unit of the mesh division.The working condition of the gantry crane under full load is analyzed.ANSYSworkbench software is used to statically analyze the model,to obtain the strength,stiffness and other data of the model under different working conditions.According to the ANSYS analysis result,,the maximum stress and displacement deformation of the gantry crane meet the requirements of the design code.In response to the deficiency of designing large-tonnage and large-span gantry crane,this paper makes some tentative exploration on the crane design by using modern design concept.The content and outcomes of this research have certain application implications to enhance the design efficiency and working reliability of large gantry crane.