Parametric Design Of Gantry Crane's Portal-framed Structure

Along with the development of our country's transport sector, hoisting and conveying machinery demand have become growing, and the use of performance requirements have become more sophisticated. So design and calculation methods of loading and unloading machines need to be renewed, substantiated and consummated constantly to make the hoisting and conveying machinery more economic, feasible, reliable and safe. To hoisting and conveying machinery, because of its specialties, and its high price, mostly the hoisting and conveying machinery is to carry on designing and madding alone under the customer request. And during the period of designing usually need many times iterative modification to the shape and the size to optimize and assort with the whole, particularly for the tiny change to structure and the product with stable process, we need according to the actual circumstance to chooses project or modifies size automatically, that is parametric design, what we need. Meantime, during the process of port machine design, the parameter involved is numerous, the calculation formula is tedious, and the calculation's efficiency is low and easily makes mistakes for the designer. Obviously this method have already can't adapted currently demand of the port machine's develops. It's a trend to make use of the strong function of calculator and combining various designing means and advanced theories in hoisting and conveying machinery's design.So this paper using JMQ3545 gantry crane as an example to make desing study of the portal-framed structrue.On the basis of further study of object-oriented technology, parametric technology and FEM technology, this paper develop a parametric design system of gantry crane's portal-framed structure, which use the object-oriented programming language VB6.0 as a platform, and the parametric design language APDL. This system can be easy and intuitive to set up a parametric model of the portal-framed structrue.Analysis various working conditions of gantry cranes, and calculate the strength, stiffness, and stability of the portal-framed structrue in the ANSYS environment. And analysis the calculation results. To aviod the card rail phenomenon duing to vertical temperature deformation when gantry crane running, this paper does flexible outrigger design of the portal-framed structrue.The optimal model of the portal-framed structrue is based on optimal theory. The main beams and cross-sectional outrigger is the variable of optimal design. The minimum weight of the portal-framed structrue is the target function. On the basis of satisfied at the strength, rigidity and other performance requirements, this paper does optimal design to the portal-framed structrue. And tests the result of the optimal design to prove the feasibility of the optimal design.