Structure Design And Analysis Of Gantry Crane For Electric Power Construction

Gantry crane is one of the most widely used lifting equipments for the construction of thermal power plant and nuclear power plant. With the remarkable development of the national economy and improvement of people’s life, the electricity is increased in demand, and our nation will invest for more thermal power plant and nuclear power plant. However, the construction of thermal, nuclear and other types of plants requires higher requirement for performance, reliability, safety and economy for gantry crane and other lifting equipments. The gantry crane for power construction on the market has the disadvantages of unsound structure, high cost of maintenance or often run off of the rail track. Therefore, a new-type structure of gantry crane need to be developed to meet actual needs of power construction.In this essay, the analysis of several common gantry crane structures is carried out. A new-type gantry crane is designed combined with a variety of design features of different structures and practical requirements of power construction. The main characteristics of such structure are listed as follows:(1) The gantry crane applies tube truss structure, formed by welding together of seamless steel pipes;(2) The connections between standard sections of main beam are selected as pins;(3) The connections between the flexible legs and main beam are adopted as pins which is paralleled with cart track;(4) The connection form between beam and trolley is cross axle type.The structural characteristics and pins connection types between standard sections of main beam of the new-designed gantry crane were analyzed in detail respectively, and contrast to formal gantry crane on economy and reliability. The strength, stiffness and dynamic behavior of this structure were analysed statically and dynamically, taking advantage of finite element analysis techniques. During static analysis process, the finite element model for the new-type gantry crane is established. Finite Element Analysis for the most eight dangerous work condition was provided and the stress distribution state and displacement deformation were obtained.Gantry crane is subjected to dynamic loads frequently during the work process, so it is of benefit that the transient response analysis and modal analysis of the new-type gantry crane structure are carried out. The function of the transient analysis is to ascertain the dynamic behavior under random loads. Within the frame of ANS YS, the dynamic behavior of the structure under lifting impact load was investigated. Results show that this new-type structure can be manipulated steadily and the structural strength and stiffness are satisfied. The natural frequencies and vibrations are determined in modal analysis, from which the main vibration modes of the structure and the resonant load which can lead to destruction were deduced. It is significant to avoid such load during work procedure.The new-type structure presented in this essay combines the advantages of several common gantry crane structures. It has tremendous practical value with other characteristics such as light self-weight, low maintenance cost, easy removal and good corrosion resistance.