液压支架换向阀用O形圈密封性能分析OA

O-ring reciprocating seal structures are adopted for the sealing rings of hydraulic support valves.The sealing performance of O-rings determines the reliability of the valve-controlled cylinder system of hydraulic supports.O-ring seal failure can cause fluid intermixing and leakage inside hydraulic valves,and lead to failures in the normal opening and closing of hydraulic valve working ports and poor attitude control of hydraulic supports.Water-based emulsion serves as the medium for hydraulic supports,and its concentration affects the sealing effect.To explore the optimal concentration for different working conditions,a simulation analysis of the reciprocating friction force under various working conditions is conducted by combining finite element analysis and numerical calculation.To validate the simulation results,an experimental device is designed and built to measure the friction force of sealing rings in reciprocating seal structures of hydraulic systems.Based on this novel experimental device,the variation law of valve core reciprocating friction force affected by working condition factors under different medium concentrations is investigated,and thus the optimal medium concentration and friction control compensation strategy under fluid pressure fluctuation are determined.