Design And Application Of Electric Actuator And Opening Control System For Swing Valve

With the continuous development of automation,electric actuators have been widely used in various fields,playing an important role in the control and adjustment process of valves.At present,there is a certain gap in the development of electric actuators in China compared to foreign countries.Especially in the field of gas valves,the automation level of actuators is limited by high safety and reliability requirements.At present,the control of gas valves is still mostly at the level of manual control,resulting in safety issues such as users forgetting to turn off the fire for a long time,mis-operation of the valve without closing,and gas leakage.Therefore,starting from the design direction of the valve actuator and control system,this article develops a rotary valve electric actuator and opening control system,which achieves valve manual/electrical adjustment,timed automatic closing,fault alarm and other functions.It improves the automation level of gas valves and the stability and safety of valve adjustment during gas use,reducing users’ risks during gas use.The specific research content is as follows:Firstly,understand the basic composition of the valve electric actuator and develop an overall design plan for the electric actuator.Analyze the working conditions of the valve and determine the design requirements for the electric actuator;Based on the torque characteristics of the valve,the motor model is determined,and the motion parameters of the electric actuator are analyzed and calculated.A two-stage reduction structure composed of a reduction motor and reduction gear is adopted,which is compact in structure,reduces transmission losses,and improves transmission efficiency.Secondly,analyze and design the components of the valve electric actuator,and make structural improvements based on the valve characteristics.Design a reduction gear mechanism based on speed distribution,and combine it with the clutch structure to design a manual/electric switching device on the basis of gear transmission;Analyze the impact of the "hammer effect" on the valve based on the motion characteristics of the sliding pin clutch.Improve the structure of the sliding pin clutch and design a bidirectional clutch structure,which can switch control modes and perform bidirectional adjustment,achieving complex valve opening and automatic adjustment and closing functions.Analyze and simplify the mechanical torque protection device,and design an overload protection spring.The stroke detection structure adopts a position sensor combined with a clutch structure to achieve valve position detection,with a compact structure that reduces costs and improves transmission efficiency.Then,use the ANSYS Workbench finite element analysis software to conduct a detailed analysis of the statics characteristics of the gear mechanism and clutch mechanism.This software can obtain important data such as stress,strain,and deformation,thereby improving design accuracy and reliability.On this basis,transient dynamic analysis was conducted on the clutch components to verify the opening effect of the "hammer effect" on the valve.Perform 1st to 6th order modal analysis on the overall transmission structure and packaging shell to verify the stability of the structure and avoid resonance.Finally,the control system circuit was designed through Altium Designer.The stepper motor was used as the executive motor,the main control chip BYD BF7615BM44 was used as the touch chip,and the valve controller circuit was designed in combination with the L6219 drive chip,touch buttons,and LED Nixie tube.The valve travel was detected using the UKS58 K position sensor to achieve the control of the valve.Design a software control system for valves in the Keil compilation environment to achieve functions such as valve adjustment and automatic closing.Build an experimental platform for opening control and closing performance of electric valves,and verify the accuracy of opening control and closing performance of electric valves.The results showed that the opening errors during valve adjustment and closing were 0.7% and 0.3%,respectively.The maximum error in closing performance resulted in a leakage rate of 0.011 m L/min.Both the opening and closing performance met the control requirements of the electronic valve,improving the safety performance of the valve.