Dynamic Analysis And Optimal Design Of Mining Chain Of QS＿650 Ballast Cleaning Machine

With the development of China’s railway industry,the number of railway lines and mileage is constantly increasing,and the performance requirements for ballast cleaning machines for large-scale railway maintenance equipment are constantly increasing.As the main operating device of the cleaning machine,the digging chain of the cleaning machine is the primary improvement object.However,at this stage,there is still a lack of systematic research on the cleaning chain of the cleaning machine.The test cost of large equipment is relatively high,and it is difficult to test in most working conditions,and the improvement effect is not ideal.With the development of computer-aided design technology(CAE)and the improvement of computer computing power,the CAE method has gradually become an important method in mechanical design.Based on this,the CAE method is used to simulate the verification of the cleaning machine’s mining chain and improve the design.It is an effective means to overcome the design difficulties.It can overcome the problems of high design costs,complex working conditions,and extreme working conditions.The active QS-650 ballast cleaning machine has problems such as poor track bed adaptability,severe wear of some components,and overweight of the chain.In order to overcome the above problems,based on the QS-650 ballast cleaning machine excavating chain,this paper uses the CAE design method to carry out simulation analysis and improve the design,and has done the following related work:(1)Establish a multi-body dynamics simulation model for the mining operation process of QS-650 ballast cleaning machine.Then,obtain and analyze the dynamic response of the chain during the mining operation.(2)Based on the analysis of the digging efficiency and the digging resistance,the improved design of the part of the chain is constructed,which mainly includes: a screed plate with a reasonable size to meet the digging requirements;a digging angle adjustment structure that can adjust the digging angle;Thread-sealed pins for dust and grease channels.Effectively solve the problems of poor adaptability of the digging chain bed and easy wear of the pin.(3)Based on the idea of discrete element,in the commercial software EDEM,through the user-defined particle platform and particle factory,a ballasted bed model containing different specifications and different numbers of broken stone ballasts is established,and the analysis is carried out during the mining of the ballasted bed by analyzing the picket teeth.The influence of the angle on the digging efficiency and digging resistance further verified the reliability of the design and analysis.(4)Optimize the design platform through Workbench,and carry out lightweight design for pick teeth with light weight as the goal,so as to realize the weight reduction of the mining chain about 5.6%,a total of 46 kg,and and the problem of excessive weight of the mining chain is effectively relieved.