Research On Sealing Technology Of Large Bore Double Expansion Column

In the process of modern coal mining,the hydraulic support as an important support equipment plays an increasingly important role.As an important bearing part of the hydraulic support,the column is always under high pressure when it is in working state.Its sealing performance directly affects whether the column can reach the rated working pressure.When the seal ring is damaged and oil leakage occurs,it will not only pollute Coal mining face,harm to human health,and lead to the hydraulic support can not achieve the expected support effect,increase the face safety risks.In order to solve the problem of poor sealing and wear resistance of the pillar,this paper combines the complex environmental conditions of Bayan Gaole coal mine working face,designs and applies the sealing technology suitable for the large bore double expansion pillar,studies the dynamic sealing of the pillar,and ensures the safe and effective operation of the supporting equipment of the coal mine working face.In view of the situation that the environment of coal face is more and more complex,and the sealing technology of double expansion column with large bore is relatively lagging behind,this paper analyzes the sealing device of double expansion column and makes the overall plan based on the mining depth,working condition of coal face and the characteristics of column stress,with reference to the common sealing device,it is optimized to be suitable for the sealing device of double expansion column with large bore,and the dynamic sealing device is optimized The structure of the seal ring is designed,and the dynamic seal on the column is changed from the original single seal to the combined seal;the cylinder in the column is determined as the analysis object through the strength check,and the mechanical analysis of the combined seal of the piston rod is carried out by combining the simulation software,and the sealing failure of the combined seal ring of the piston rod is obtained when the load is 60MPa,and the oil guide angle is designed and optimized according to the combined seal of the piston The damage model of sealing ring is set up,and the fluid structure coupling method is used to simulate the damage of sealing ring.A set of orthogonal experiments is designed,through range analysis and variance analysis,the order of influencing factors of seal ring damage is obtained;AMESim simulation model is established to compare the performance of piston combined seal ring and drum seal ring in low-speed stability and dynamic response,which proves the superiority of piston combined seal;finally,based on the characteristics of current piston combined seal working conditions The experimental results,theoretical analysis results and fluid structure coupling simulation analysis results are compared.The three analysis results are consistent,which proves the validity of the analysis.Through the structural design,mechanical simulation research,hydraulic control system analysis and experimental analysis of the sealing device of the double expansion column with large bore,the paper optimizes the combined seal of the piston rod,verifies the biggest influencing factor of the damage and failure of the combined seal of the piston,and proves the superiority of the combined seal of the piston through the comparison with the drum seal,so as to effectively solve the sealing problem of the double expansion column with large bore Poor sealing and wear resistance.The research results have important reference value for the improvement of column sealing technology and play an active role in promoting the support level of working face under complex conditions in China.