Design Of FHTT2800 Tower Crane Rotary System

Now the design and dynamic analysis of tower crane slewing system's structure mainly are completed through the CAD and CAE.It can not only quickly analyze the mechanics of structure,but also save time and money.This article through a variety of software integration make full use of the characteristics of the software to complete analysis of the tower crane slewing system mechanical properties.In addition,it provides theoretical data for the design,manufacture and safe operation of tower cranes,and lays the foundation for smart manufacturing and lightweighting of tower cranes.There are the main works:Firstly introducing the current research status of the tower crane slewing system,and then introducing some of the basic structure of the FHTT2800 large flat jib tower crane study in this paper.Combining with the relevant manual standards,different loads and the limit values of the working conditions at different loads that tower cranes slewing system carried were calculated and studied in four working conditions.Then the parameters of the support system,the motor reducer and the slewing mechanism were calculated and checked,to ensure the structural design reliability.Using the general 3-D slid modeling software Solidworks build the CAD model of the FHTT2800 tower crane slewing system,which include the upper support,the slewing mechanism,the lower support,the support legs and other components.According to the related installation requirements and size requirements,crane slewing system model assembly work,and the interference of the model was inspected to ensure the reliability of follow-up analysis.Combining with the theory of finite element analysis,using the ABAQUS software to take static characteristics and dynamic characteristics analysis about the main components of the FHTT2800 tower crane slewing system under different wind loads.The deformation of the relevant components and the whole machine was obtained.The modal analysis of the FHTT2800 tower crane slewing system is carried out to get the natural frequency and vibration mode of the slewing system.Comparing the results with the design parameters,this not only is the test of experience design but also utilize the finite element analysis to promote the development of tower crane slewing system.Aiming at the partial structure of the FHTT2800 tower crane slewing system tooptimize.With not increasing the weight of the structure,increasing the stiffness of the structure and increasing the natural frequency of the structure.The upper support seat of the tower crane slewing system was optimized by applying the relevant optimization theory optimization.After optimization,the weight of the upper support is reduced by 1%,the deformation is reduced by about 11% and the first mode is increased by 9.6%,the optimization effect is clear.As an important slewing structure in the FHTT2800 tower crane slewing system-the gear slewing structure.This article analyzes the contact stress of the gear according to the characteristics of slewing structure.Firstly a high-precision gear model is built by 3-D software basing on the traditional calculation method of contact stress of involute gear.And the calculation and analysis is based on Hertz contact theory.Then the contact stress of the gear is simulated by finite element analysis and compared with the theoretical calculation results.Finally,analyzing the factors that effected the gear contact stress,which provides the theoretical support for maintenance of the tower crane slewing system.