Mechanical Analysis And The New Structure Of Gantry Crane Beam

Abstract:Gantry crane is a deformation of the bridge crane. The main girder is its main bearing mechanism, with complex structure and poor working environment, and the weight is accounted for more than30%of the complete machine weight. So the design and mechanics performance of main beam have important influence on crane girder, and the lightweight research also has great economic benefit. This article takes the hoist crane finite element analysis as a foundation, combines static and dynamic analysis of main girder, optimizes the structure of crane girder cross section size before and after improvement respectively, and does the stress test to the original crane. Compared with simulation re-sults, the experimental results verify the accuracy of the simulation model, and also reflect the rationality of optimized result to a certain extent. This paper’s main contents are as follows:(1)With ANSYS software, the finite element model of gantry crane is built to make static analysis on the six typical conditions of gantry crane. On this basis, the size of the girder section is optimized and its weight was reduced by5.9%, which proves the obvious effect of the optimization.(2) The mechanical model has been dynamically analyzed after the optimization. With the top ten modal presented, the maximum natu-ral frequency meets the requirements of the gantry crane dynamic stiff-ness. Moreover, both the stiffness and strength of main girder meet the requirements after the transient kinetic analysis.(3) The new structure of the gantry crane is tentatively designed to optimize the stress of the main beam with the added construction above the main beam. On this basis, by using the multi-objective and mul-ti-operating mode optimization function of Hyperworks’module Opti-struct, the main beam section has been further optimized, and the weight of hoist crane’s main beam has been reduced by10.92%. The stiffness and strength meet the requirements, with different degrees of increase of the first to eight-order models, which indicates that the new hoist crane structural style is more reasonable and meet the design requirements. Compared with the pure size optimization, the economic efficiency is more obvious.(4) The static stress test research is conducted. By testing the stress of a specific section, the main beam position and size of the stress distribution are attained and compared with the simulation analysis re-sult. The measurement result and the simulation result are approximate-ly same, which shows the rationality and accuracy of the simulation.