Optimization Design And Research On Anti-vibration Of JQX-125M Electromagnetic Relay

Electromagnetic relay is widely used in aviation,aerospace and military electronic equipment switching circuit,especially for some national defense electronic systems,which requires sufficient endurance learning environment capability.Therefore,the electromagnetic relay must have good anti-vibration performance so as to ensure the reliable action of the electromagnetic relay under the condition of vibrating environment.The study of the anti-vibration performance of electromagnetic relay has a certain reference and practical value for improving the endurance and reliability of the electromagnetic relay.First of all,the vibration problems of the electromagnetic relay JQX-128 M are presented by vibration test.According to the structural characteristics of hermetically sealed electromagnetic relays,the finite element modeling criterion are proposed.Combined with the assembly process of the relay,the effective treatment methods of the riveting and welding of the key links and the applied load and constraints are determined.Based on the founding flow of finite element model and MSC.Patran/Nastran Co.element software,the finite element models of the contact system of relay and the complete relay are established,which is the foundation for the anti-vibration performance analysis of relay.Secondly,according to the theory of material mechanics,vibration mechanics theory,finite element method and the finite element model of the contact system,the modal analysis of the contact system is finished and the resonant region of contact system is obtained.On the basis of the finite element model of the relay,the modal analysis and response analysis of sinusoidal vibration frequency about the relay are carried out and the interval for resonant vibration of relay and vibration generator system.The anti-vibration simulation analysis results of the contact system and relay show that the natural frequency of contact system can meet the requirements of the frequency range of vibration test,and the relay machine can not meet the requirements.Thus,the object and target of relay's anti-vibration optimization are definited.In addition,combined with the vibration failure mode appeared in the process of actual production of JQX-128 M electromagnetic relay,the failure mechanism is analyzed.The main factors affecting relay sinusoidal vibration failure are screened out.Through the vibration test,the key factors influencing the electromagnetic relay vibration failure are determined,which are the bracket height,shell height,thickness of damping spring.Finally,according to the main factors affecting the relay vibration failure,the optimization goals and optimization scheme of relay concrete structure are put forward.The relationships between the anti-vibration performance and the stent height,shell height and damping leaf thickness are researched by simulation.Based on those relaitonships the best value of optimization scheme can be achieved.The relay model based on the optimization scheme is founded.Then the modal analysis and frequency response analysis are finished in order to verify the rationality of optimization scheme.new samples are producd.The vibration test of new samples verifies the feasibility and accuracy of optimization scheme.The research results presented in this paper have a reference value for the study of the anti-vibration performance for electromagnetic relay,and the research conclusions can be applied to the design process of the same type of balanced rotary electromagnetic relay.