Design Evaluation of the 375T Electric Overhead Traveling Crane

In heavy-duty material handling equipment, major concern is optimum utilization of material for equipment construction without sacrificing the design parameters. To understand this aspect and also to validate the design, as this kind of equipment are a vital part of any manufacturing industry, finite element analysis is one of the best method that can be used extensively. The major advantage is that the equipment need not be manufactured and tested physically to find out the drawbacks. Instead one can simulate the conditions through finite element analysis to obtain an optimum design. In this paper, authors carried out the stress analysis of 3 major load bearing components: Crane Girder, Lifting Beam with Crosshead and Crab Frame Assembly of a newly designed 375 T Electric Overhead Travelling (E.O.T.) Crane. Two such cranes will work in tandem to lift 700 tons. The finite element analysis was carried out for the rated load condition with some impact factor and also for the overload condition. Maximum stress and displacement locations were obtained for each of the components to check the validity of design values. All these values obtained through detailed finite element analysis were found to be within the design limit. The design and analysis results were validated through strain gauge measurement. The crane was further tested at site for over load condition as this forms a part of the acceptance criteria for installation. This test also passed without any failure or deformation on the major components. The complete analysis work gave a very good insight on various component design of crane and also a high degree of confidence, with cost saving.

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