Contact Research And Program Realization Of Single Row Four-point Contact Ball Slewing Bearing For Building Maintenance Unitx

With the support of high-performance materials and high-tech equipment,modern buildings have different structural forms and rising heights,so the building maintenance unit,which plays the role of curtain wall maintenance and high-altitude transportation,has been widely used.The new GB/T 19154-2017 "Building maintenance unit" on the requirements of the working load of the building maintenance unit is also constantly improving,the structure of the building maintenance unit put forward higher requirements.The performance of the building maintenance unit in the process of operation is closely related to the slewing mechanism.The slewing bearing is the most important part of the slewing mechanism.In the process of operation,the load of the building maintenance unit is too large or the load is biased,and the contact state of the slewing bearing will become very bad.Once the failure of slewing bearing will lead to the whole machine rotating constantly shaking,noise or even stuck,so it is necessary to study the contact of slewing bearing of building maintenance unit.(1)In this paper,the model of the whole machine of the window cleaning machine is simplified,and the loads borne by the slewing bearing under different working conditions are calculated theoretically.The three-dimensional model of the whole machine is established in Solid Works,and the virtual prototype model is established in ADAMS.The numerical variation curve of the load borne by the slewing bearing under normal working conditions is obtained by dynamic simulation.The maximum load is determined to provide load data for the subsequent finite element contact analysis.(2)In the Workbench of slewing bearing integral finite element contact analysis,obtain the raceway stress distribution,foreshadowing for the later verify the validity of the program,respectively by using Hertz contact theory and the method of finite element analysis of a single rolling element and raceway of the maximum contact stress and contact area,and to consider the hardening layer raceway elastic-plastic contact analysis,It is found from the data that there is no plastic deformation of the slewing bearing.(3)To parametric modeling of local slewing bearing,the radius of curvature and the contact Angle as the input variables,the maximum contact stress,the maximum Von Mises stress and maximum deformation quantity as the output variable,establish contact selected sample points,using the response surface method draw curve,found the radius of curvature and carrying capacity of inversely proportional,contact Angle and carrying capacity become direct ratio.The circular raceway of the same type of slewing support is changed into an elliptical raceway,and the same load is loaded on the elliptical raceway slewing support,and the carrying capacity of the elliptical raceway is found to be superior.(4)The relationship between the load and displacement of the sleuthing bearing was established,and the expression of the potential energy function of the sleuthing bearing system was established.The contact problem was transformed into a global optimization problem with the minimum potential energy as the objective function.The program realized the output of the displacement of the inner ring and the maximum contact stress between each rolling body and the inner raceway.The results are compared with the stress nephogram of the whole circle finite element analysis to verify the effectiveness of the program.