| The large clamped sling is the basic manufacturing equipment for the production of large cast and forgings.With the development of mechanical equipment to large scale,higher requirements have been put forward for the function,bearing capacity,life and reliability of the sling.The improvement of the hanger's mechanism can make the function of the hanger more perfect,and the fatigue life and reliability of the sling can ensure the safe use of the sling.In order to improve the function of spreader and ensure the convenience and safety of spreader,this paper focuses on the key problems such as structural design of spreader and fatigue life analysis of spreader.The main tasks completed are as follows:(1)The structure design of the clamp type hoist and the optimization of the length of the rod.Comprehensive analysis and improvement of the different mechanism,design of semi V block structure,implementation of integrated transport,lifting,holding stand material function;consider sling self-locking,arm bending moment,spreader size performance and parameter,multi-objective genetic algorithm optimization based on length of the sling,and through the dynamic simulation,the rationality of the lifting device design verification.(2)The fatigue life analysis of the clamp type hanger.Through the finite element analysis,the contact force is extracted and the contact force of the single component is deduced.Through the comparison,the analysis of the single component is more accurate.The structural mechanics and thermal structure coupling analysis of the crane arm are carried out respectively.The results show that the thermal radiation has a great influence on the force of the crane arm,and a new crane is put forward.The structural form of the arm,the theory and method of life reliability and life,the theory and calculation method of thermal structure coupling fatigue life are introduced.The fatigue life of each component is 99%,and the results are beyond the design life of the hanger,and the larger optimization space for the hanger parts is explained.(3)Structural optimization of the hanger parts.The mechanical parameters corresponding to the reliability of 99% life of 105 times are derived,and the lifting arm is topologically optimized,and the components are reconstructed according to the topology optimization results.The size optimization of the lifting arm is optimized according to the improved number model with the minimum mass as the goal to satisfy the fatigue life as a constraint,and the results are better than the domestic sling. |
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