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Tower crane is one kind of the important engineering machine, it’s the essential work tool in engineering construction. Slewing frames is a very important structure of tower crane, At present the tower crane’s slewing frames uses slewing bearing installment. It consist of top rotating platform slewing bearing and low rotating platform. It connection tower body, and other parts such as erector beam, balance arm, and it can revolve 360 degree about the center of the tower body to lift the load. But in the Past, it design always based on the experiences. Finally, some structures are very unwieldy; Some structures are frail, cannot satisfy the work requirement. Therefore, this article utilizes the finite element method to design, which guarantees its structure the rationality.This article takes 150 tons flat head towers machine as the object of study, take the finite element method and the mechanical strength as the rationales, chooses the slewing bearing, design top and low rotating platform, then makes the structure finite element analysis. Finally makes the optimization design for the platform. The present paper has done the following work:1. According to the design provides load and geometric parameter, defers to the capacity of slewing bearing and the principle of choice model, chooses an appropriate slewing bearing for tower crane.2. According to slewing bearing and tower body’s structure size, design rotating platform structure, Uses the ANSYS software to establishes rotating platform model, then makes the structure finite element analysis. Aimed to find the Principle of the area with high stress and big deformation, and estimated the effect on the tower crane.3. Adopting the rotating platform most dangerous operating mode to take the basis, makes its optimization design, reduces the rotating platform the quality reasonably.
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