Finite Element Analysis And Experimental Study On Safety Protection Structure Of Excavator Cab

The excavator is a general-purpose device that uses earth and stone as the main purpose of excavation and shovel loading and unloading,and is an essential engineering vehicle for the development of modern society.Due to the extremely poor working conditions of the excavator,it is difficult to avoid safety accidents such as rollovers and falling objects.These accidents caused great pain to the driver and his family,but also caused major economic losses to the country and society.Therefore,the excavator cab rollover and falling object protection structure as a safety structure to protect the driver's personal safety and reduce the economic losses caused by the accident is an essential part of modern excavator design.Under this background,this thesis summarizes the performance requirements and test methods of rollover and falling object protection structures by investigating and referring to a large amount of domestic and foreign data on the overturning and falling object protection structures of the cabs of related engineering vehicles.The difficulty in the study of the current structure is how to solve the problem of the balance between the stiffness,strength,and energy absorption of the structure.This thesis first uses Abaqus finite element analysis software to carry out the ROPS structure of the excavator rollover and falling object protection structure of the lateral minimum bearing capacity,lateral minimum absorption energy,longitudinal minimum absorption energy and vertical bearing capacity and FOPS structure top protection calculate the working condition simulation analysis,the result obtained accords with the international standard to the structural safety performance requirement.In accordance with the test methods required by international standards,the rollover and falling object protection structures were tested.The comparison simulation results indicate that the details of the bolt connection between the top protection structure and the ROPS structure are not taken into consideration in the FOPS simulation analysis,and the reasons for failure of the ROPS structure test are summarized.The analysis shows that the rigidity of ROPS structure is too large.Therefore,a series of specific schemes are proposed for the reduction of ROPS structural rigidity.Finally,according to the scheme,the original model is improved and simulated.Through the analysis of the results,it is judged that the improved model has better ability of absorbing energy than meeting the requirements of the international standard.