Parametric Design Of Working Device Of Heavy-duty Excavator And Rigid-flexible Coupling Dynamic Analysis Of Walking Device

China has a large number of coal mines,mining technology and equipment related to the level of mine production and production safety.Heavy-duty large-scale machinery has been gradually expanded into coal mining equipment can not be missing.The working device of a heavy-duty excavator includes a bucket and a supporting rod and boom for excavating ore.In the operation of the heavy excavator,the mine is taken and transported by the excavator operating equipment,it receives most of the force.Bucket often bear a variety of loads,boom and boom often bear torque and bending moment,once the heavy excavator problems,it will directly cause damage to the heavy machinery.The practice shows that the wear and tear of bucket bar and bucket teeth often occur in the working equipment of heavy excavator,which seriously affects its working effect.Therefore,it is very significant to carry on the structure stress calculation and the parametric design to the heavy-duty excavator’s working equipment.However,because of the complex structure and working conditions of the working device,it would be very tedious to build,load and analyze the finite element model again after every structural improvement.Therefore,it is very necessary to write the practical analysis code for the working device of heavy-duty excavator under different working conditions.Based on IronPython parametric design language supported by ANSYS,the modeling program of excavator working device in Ansys Space Claim and the finite element calculation and analysis script of Mechanical under certain working condition are firstly written.Encapsulating the tedious Iron Python parameterized language,using the ANSYS Act plug-in to develop a friendly interactive interface,invoking the encapsulated modeling and finite element analysis script files,an integrated system of parametric design of working device is established,which includes model building,finite element analysis and parametric input interface.In a sense,the quality of work can be improved by reducing manual work.With the help of the company and the results of the experiment to verify the rationality of the code analysis,the final analysis is very reliable.The parametric design system verifies the reliability and security of the integrated analysis.This analysis platform not only provides a useful way for the structure analysis and design of other heavy excavators,but also lays a solid foundation for the structure design and analysis of the whole project.Therefore,the working efficiency and level of the heavy excavator can be greatly improved.In view of the heavy weight of large-scale heavy-duty excavators,the crawler frame,as the main supporting mechanism,bears a complex force in the working process,and in view of the working state of different working equipment,the conventional dynamic simulation can not deal with the stress-strain problem well,so a rigid-flexible coupling technique is adopted to simulate and analyze it.For the crawler frame,the flexible method is adopted,and the other rigid systems are established.The rigidflexible-coupled dynamic system of the walking device is established.Then the different speed is applied to the driving wheel to get the power output when driving in a straight line,climbing up the hill and turning in place.The stress and strain of the crawler frame in different states are obtained by using the finite element calculation of the Crawler crane under three working conditions.In addition,through the rigidflexible coupling dynamic simulation of the traveling mechanism of the excavator,the problem of the support wheel force which is difficult to be solved by theoretical calculation is analyzed.The results show that the deformation and stress of the bottom plate of the excavator can be accurately reflected by the rigid-flexible coupling dynamic simulation,which can be used for reference in the optimization design of the lower frame of the heavy excavator.