Study On Structure Optimization Of Sliding Car Gear Main Frame

The stopper is a line safety device installed at the end of the track to prevent the vehicle from losing control and rushing out of the line due to slipping,mechanical failure or improper operation.With the continuous increase of railway operation speed and the increase in the number of vehicles in the marshalling caused by the demand for transportation volume,new tests are put forward to the line safety equipment.The DC-H-Y sliding blocker has the characteristics of high structural strength and convenient disassembly.However,it was found in the test that the main frame structure of the stopper was broken,and then an accident occurred in which the car body separated from the bogie and climbed onto the main frame.It is necessary to find out the cause of the damage,and improve the existing main frame structure,so as to provide suggestions for improving the use of this type of car stop.First,the main frame model was established in Solid Works,and the simulation calculation was carried out using ANSYS Workbench.Analyzing the cause of the excessive stress and determine the location of the maximum stress.Taking reducing the stress of the main frame structure as the optimization goal,the weak positions of the main frame structure under different working conditions are optimized and improved.Then the lightweight calculation of the improved main frame structure is carried out again,and the lightweight model of the main frame is determined according to the calculation results and combined with the process,transportation and installation issues.Finally,the lightweight model of the main frame is checked and calculated.Research has found that the front and bottom of the main frame structure are relatively weak when subjected to large impact loads,and it is necessary to change the structure and further optimize the design.Through preliminary principle analysis,the weakness of the main frame structure is linearly related to its span and the length of the main frame.When the impact force of the coupler is 700 k N,considering the extreme conditions where the coupler has no deflection and the maximum angle of lateral deflection is 13° and the maximum angle of vertical deflection is 9°,the three working conditions are changed and optimized by changing and optimizing the main frame structure.The maximum stress of the main frame structure is controlled below the calculated limit of 200 MPa.After the lightweight design,the mass of the main frame was reduced by 12.8%.Finally,the lightweight model was checked and it was found that the removal of the structure did not affect the strength of the main frame.Finally,a new type of main frame structure is obtained,which improves the safe working range of the DC-H-Y car stopper.