Universal Gantry Crane Structure Theory Modeling And Cad System Integration

As an important type of hoisting and conveying machinery, gantry crane is widely used in factory, construction field, railway station and storehouse. Parametric computer aided design software now has not been developed for domestic series gantry crane, the convenience and advantage of CAD/CAM hence could not be displayed. To increase designers' efficiency and shorten design time, it is necessary to develop a professional parametric CAD system.The gantry crane CAD system is divided in the following modules on principle of module design: input module, dimension computation module, structure analysis and modeling module, optimized design module, definite element analysis module. In this thesis, structure analysis and modeling and two dimensional parametric drawing are researched. In structure analysis and modeling module, a series of calculating and checking function is programmed, which can result aim function and constrains for optimized design module. In two dimensional parametric drawing modules, SCR script file is resulted in programs, which can drive AutoCAD to draw. The gantry crane CAD system based on Windows operating system, taken Script file as data interface, is developed in Visual C++. Limit design is used in the software design in consideration of load importance and anti-force by dividing load factor and bearing factor. Using parameterized modeling of CAD soft, metal structure of a double-beam gantry crane is designed. As a result, design efficiency is increased, design cycle shortened and material used adequately. The limit design is superior to the permissible stress method by comparing the result of two different methods in same parameter. The method taken in this thesis can be regarded as an important reference in gantry crane design and is worth spreading.