Finite Element Analysis And Application Research Of Internal Expansion Self-locking Cylinder

The internal self-locking cylinder has the advantages of bearing heavy load and reliable locking,and now it becomes the best choice for vehicle leveling platform with heavy vehicles.At present,there are some shortcomings in the research on the research methods and mechanical properties of the self-locking cylinder with internal expansion.Based on this situation,the finite element method is used to analyze the mechanics of self-locking cylinder based on the characteristics of its work in this study.An integrated self-expanding self-locking cylinder with two external ports is proposed and the flow of oil in the working process is analyzed in detail.The design formula of interference is proposed based on the theory of thick-walled cylinder.Secondly,the finite element model is established by ANSYS and the static analysis is carried out to obtain the stress-strain through the establishment of the finite element model with different friction coefficient,ambient temperature and contact area.The mechanical influence of the above factors on the interference interface was discussed.In addition,locking and unlocking pressure is got by testing the internal expansion self-locking cylinder,and then putting forward an integrated internal up-lock type self-locking cylinder with only two external ports(inlet / return oil).In order to probe the feasibility of locking the oil cylinder by establishing the AMESIM model of the integrated hydraulic system.integrating the main control elements of the integrated hydraulic system are assembly in the self-locking piston,completing the structural design of the control element and realizing the structural design of the integrated self-locking oil cylinder further,and finally establishing the structure of the integrated hydraulic system during the working process Flow field model,getting the flow channel pressure and velocity field distribution through the simulation calculation.The results show that the radial deformation of the inner wall of cylinder bore tends to be consistent with the theoretical design value,which fully demonstrates the correctness of the modeling.What the stress distribution are complicated at the contact surface is in line with the mechanical characteristics of the actual model,which provides the basis for the superiority of the finite element method and strength check.At the same time,the self-locking capability of the cylinder is obtained to meet the design requirements through the performance test of the self-locking cylinder with internal expansion.The unlocking pressure meets the need of practical work and provides reference for the further optimization and improvement of the structure.Through the establishment of steady-state mathematical model and AMESIM model during the working process of the integrated self-expanding self-locking cylinder,the performance parameters of the integrated self-locking cylinder can be obtained and meet the requirements of practical work.The feasibility of the integrated hydraulic system is fully proved Structural design of the main hydraulic components(sequence valve,counterbalance valve assembly),and achieves the integrated design of the integrated internal expansion self-locking cylinder further.It is fully proved that it meets the requirements of self-locking force and strength by the finite element analysis of the integrated self-locking cylinder in the self-locking state.The flow characteristics of the integrated self-locking cylinder in the four work processes of no-load expansion,load extension,no-load retraction and belt retraction are analyzed to the improvement of runner for reference through the Fluent simulation calculation.