Research On Load Distribution Of Slewing Ring And Bogie Of3000-ton Crawler Crane

With the development of water conservancy, wind power, petrochemical and the third generation of nuclear power constructions, the design of over-sized crawler crane has been paid more and more attention, and the design of the slewing bearing device is the focus of its design.At present, the rotary bearing device of the double truss boom crawler crane consist of two main bogie system, one support bogie system and slewing ring. Partial load is supported by the main bogie system and the load bearing by the slewing ring are reduced, so the slewing ring could be designed to meet transport requirement. The loads of slewing ring and main bogie system of this rotary bearing device can not be obtained with the conventional analytical calculation, and the variation of the turntable stiffness and crawler chassis stiffness will affect the distribution of the loads.This paper firstly introduce the rotary form of crawler crane and their slewing ring analytical calculation methods. Then,it rely on the3600t crawler crane projects wich dalian university of technology and XCMG construction machinery in cooperation carry out, take a the crawler crane’s host structure as the research object, and use the finite element software ANSYS and parametric design language APDL as the main research tools. The finite element model of the superstructure and host structure is established based on the finite element software ANSYS. The load distribution of slewing ring and bogie system is analyzed by finite element calculation of the superstructure and host model which have different link points between former turntable and middle structure, is analyzed by changing former turntable side board thickness which is simulated its the stiffness,is analyzed by the changing the vertical constraint displacement of the slewing ring board which is simulated the car body stiffness, is analyzed by different main bogie wheels vertical constraint displacement which is simulated two main bogie system installation clearance. Studies have shown that with the connecting link points of the former turntable and middle structure moves to the middle, the bogie system load increase and the slewing ring load decrease; and with the increase of the stiffness of the former turntable and the frame, the clearance of the U-shaped ear plate of the bogie system, the bogie system load decrease and slewing ring load increase.In this paper, slewing ring load and bogie system load are achieved by analysis, and analyze the major factors which affect the load distribution. This method will provide some guidance on the future design, especially for the rotary bearing device which composed of the slewing ring and the bogie system. Moreover, this method has actual application value in engineering field.