Experimental Research On The Sealing Performance Of Floating-ring In All Hydraulic Drilling Rig

All hydraulic tunnel rig is the key equipment in directional drilling for gas drainage and geological prospecting. Floating-ring is an important sealing part, through which to provide the high-speed rotary chuck with high pressure oil, making the chunk with the ability of transferring torque and axial force to drilling rod. Nowadays, the floating-ring design is was mainly relied on experience, lack of sufficient theoretical foundation. In this paper, the sealing principle analysis and test research were combined to come up with the optimal design method for the floating-ring, which has great meaning and practical value.The sealing principle of floating-ring was analyzed, interstitial fluid drag effect principle in seal process of floating-ring was based, some parameters with significant effect for seal ability of floating-ring were studied, such as floating-ring clearance, throttle length, drift force, rotating axis friction power, material choice and radial deformation.A test equipment for seal ability of floating-ring was designed. A principal order for leakage rate caused by all factors in test was analyzed using orthogonal test method; though orthogonal test datum and variance analysis method, leakage effects caused by main shaft and floating-ring length-width ratio were analyzed. Linear equations for leakage rate and related parameters were established upon multiple linear regression analysis, providing a math model for optimum design of floating-ring.Through the test study on sealing ability of floating-ring for all hydraulic tunnel rigs, the design thought and method for floating-ring in optimum design was summarized, necessary amend and makeup for existing design method were made, the goal of math model establishment and floating-ring optimum design were gained.