Analysis Of Non-uniform Wear Mechanism Of Follow-up Valve And Research On No-load Resistance Measurement Technology

As the core component of many important technical equipment,the stability and reliability of the hydraulic system often directly determine whether the relevant equipment can operate reliably.The follow-up valve studied in this paper is the main component of the key component combination cylinder in the steering hydraulic system of a certain model of vehicle.The rubber O-sealing ring near the valve spool of its spool valve will have serious eccentric wear problems after a period of operation.This problem directly affects the follow-up control performance of the follow-up valve and the overall control effect of the servo system,thereby affecting the driving safety of the vehicle.Therefore,this article takes the follow-up valve as the research object,and conducts an in-depth study on the eccentric wear of the sealing ring of its spool valve.The research results have important guiding significance for the design and production process improvement of the follow-up valve.The main contents include:(1)The radial force of the valve spool is analyzed.First,the spool valve was used as the research object,and a three-dimensional model of its flow channel was established using SOLIDWORKS software.Then the FLUENT software is used to numerically solve the flow field,so as to obtain the radial flow force on the rotary surface of the spool.The reasons and influencing factors of the radial flow force of the spool are analyzed.Aiming at the radial component force generated when the rotating plate drives the spool,this paper has carried out a theoretical derivation in consideration of the actual size and working conditions of the spool valve.And combined with the previous flow force analysis,a mathematical model of the total radial force of the spool is established.(2)A simulation study on the contact stress between the friction pair composed of the sealing ring and the valve sleeve is carried out.Combined with the related knowledge of elastohydrodynamic lubrication,the lubrication state between them is analyzed.Then,the Archard friction and wear model was used to establish the relationship between the concentricity of the seal ring groove and the wear rate.(3)Based on the requirements of the no-load resistance measurement experiment,an overall plan for no-load resistance measurement is proposed and the no-load resistance mathematical model under this plan is established.Then the mechanical structure of the no-load resistance experiment platform and the hardware and software parts of the data acquisition and control system are designed.(4)In order to obtain a mathematical model of the relationship between the output voltage of the force sensor and the input force,and simultaneously detect the load characteristic index of the sensor,and evaluate the uncertainty of the measurement result,the forward channel of the data acquisition control system needs to be calibrated.Then the no-load resistance measurement experiment was carried out on the experimental platform to verify the correctness of the previous theoretical research.