Structure Design And Finite Element Analysis Of Key Part Of Small Dynamic Rammer

There is obvious collapsibility in the Loess Plateau of Northern Shaanxi in china,The foundation needs to be reinforced when building highways,airport and high-rise buildings.In order to eliminate the collapsibility of the foundation and improve the bearing capacity.The collapsibility of loess can not be eliminated by traditional tamping methods,based on the research of the mobility and stability of the walking mechanism of the dynamic compactor,the walking system,packing system and the lifting system of a 60t.m small dynamic compactor were designed,and the finite element analysis of the frame,the boom and the hydraulic winch was carried out,the stress and strain of the frame,the boom and the hydraulic winch were analyzed,and the natural frequency of the frame and the boom was analyzed,The fatigue life of the boom was analyzed.The main design and research contents include the following aspects:(1)The dynamic compaction method and the dynamic compaction machine were analyzed,and the development status of dynamic compactor at home and abroad were introduced.(2)Study on the main performance of walking mechanism of dynamic rammer.Under the working conditions,the bearing capacity of environmental soil was analyzed according to the pressure-subsidence model proposed by bell.The straight line,turning and off-road performance of dynamic rammer were analyzed and calculated.It provides the theoretical basis for the following structure design.Finally,according to the above calculation requirements for the following structure design foundation.(3)The key components was designed.A 60t.m dynamic rammer was designed to carry out the design of walking structure,including the design and calculation of crawler,driving wheel,supporting wheel,supporting wheel,tensioning wheel and frame,etc.,so as to verify the rationality of structure design in theory.(4)Hydraulic system of crawler type dynamic rammer was designed.According to the functional requirements,the power system was designed,the mainly hydraulic power in this paper was designed,including the design of motor selection,hydraulic motor and main pump power calculation and selection and hydraulic schematic design;And calculate the energy loss in the process of work,put forward the improvement plan,reduce the energy loss,improve the work efficiency.(5)The finite element model of frame,boom and hydraulic winch were established and modal analysis was performed.The fatigue life analysis of boom was analyzed by ANSYS Workbench.Then the model of boom and frame were designed by SolidWorks,The results show that the frame,boom and hydraulic winch have sufficient rigidity and strength,and the dynamic compactor will not cause frame and boom resonance and boom fatigue when it works normally labor destroyed.The dynamic rammer designed in this paper has been put into production,and in northern Shaanxi Xi'an area was used.The collapsibility of loess was reinforced,and easy to control.