The Damage Analysis And Research On Crank Pin Of Beam Pumping Unit

At present,oil extraction equipment used in the oil field is mainly based on conventional beam pumping units that are independently developed.In recent years,with the deteriorating working environment of oil fields and the problems of aging of pumping unit components,beam pumping units often suffer from problems in the long-term working process that result in failure of normal operation due to damage to key components.In the case of accidents.The damage caused by damage of the crank pin was accounted for a large part of the failure of the beam pumping unit.Therefore,it is necessary to analyze and study the ruin of the crank pin of the beam pumping unit.(1)The C-456D-305-144 pumping unit was used as the object,and the kinematics of the pumping unit was analyze d,and the crank pin and the connecting rod were submitted to force analysis and multi-body dynamics analysis.(2)Structural static analysis and modal analysis are performed on the crank pin.The dynamics analysis software ADAMS is utilized to simulat e the rigid-flexible coupling dynamics of the crank pin,and the load spectrum file is obtained.According to the static analysis results of the crank pin and the load spectrum,the crank pin fatigue analysis model was established in the nCode fatigue anal ysis software.The crank pin was analyzed for fatigue damage.(3)Based on the elastic contact theory,the finite element simulation analysis of the crank pin fretting characteristics under different connecting rod tension,friction coefficient and pre-tightening force was carried out,and the influence of the three on contact pressure,frictional stress and slip distance was obtained.Laws,and discussed some of the methods and measures to slow down the micro-movements for the analysis results.(4)Based on the Design Exploration optimization module,parametric modeling,parameter correlation analysis and response surface analysis are performed on the crank pin.Optimization of structural parameters of crank pin based on multi-objective genetic algorithm.Under the optimal parameters,the mass of the crank pin is decreased by14.9%,and the maximum deformation is decreased by 23.27%.(5)T he optimized crank pin structure was put back into the whole pumping unit,and the multi-body dynamics simulation analysis was conducted on the beam pumping unit before and after crank pin optimization.T hrough comparison and analysis,it is found that the stress of the relevant components of the complete machine has been improved after the structure of the crank pin has been optimized.At the same time,the rationality of the crank pin optimization and the necessity of damage analysis and research are also verified.Through the research of this topic,it provides support for improving the reliability of the crank pin and even the whole pumping unit,which has important practical significance.