Outside the shield main drive seal failure disposal

Outside the shield main drive seal failure disposal - 2019 11 - 15 juck, Qiu Tian Outlines a subway project of shield machine in the process of hard rock drivage whole section, the maintenance engineer daily patrol found outside the main drive seal test chamber with mud leakage and gear oil cavity also has a mud, speculation of an outer seal failure, and immediately report to headquarters, and stop the comprehensive system on the main drive seal check, at the same time contact shield factory technical service department for technical guidance, the consistent conclusion, seal failure, need to change two outer seal. Outside the main drive outside the sealing principle of main drive seal is the main function of the soil bin in the sandstone, mud from the main bearing, gear box, prevent sand wear into the main drive system. With oil cavity between sealing and cutting wheel flange, each cavity uniform layout have grease injection hole, each oil cavity supply lines are supplied by an independent oil distributing valve constant supply, make the oil cavity always maintain a constant amount of grease and oil pressure. Compaction shall be filled with the grease is not only the clearance between the ring and sealing lip, keep continuous overflow capacity, appropriate to continue the mud within the soil bin, sandstone and the main drive internal seal chamber isolation, to achieve sealing effect. Outside the main drive seal replacement 1 clear outer gland removed cover plate, then cover the top with a silk top out ( Even out, otherwise difficult to remove) 。 Flat out after use crochet hook out of the first line of the sealing, clean up the oil on the runway. Demolition of spacer ring, continue to use crochet hook out of the second seal. Flushing pipeline hydraulic oil in seal after the demolition, scrub the runway. Need special attention is that the entire outer seal in the process of dismantling and installation, you should always keep the soil bin level below the outer seal. 2 seal installation of the replacement of external sealing models for 3200 * 3136 * 30 ( Merkel） Germany imported parts. Seal installation check the sealing lip towards correctly, prevent seal reverse, each sealed by installing person carefully check it again. After checked, in a sealed joints with mould and mount hoop, easy to make the joint close to, and then use special glue to stick seam. Then with hot blow to heating of seams, keep the temperature in the 60 - 80 ℃ for 120 min. Joint connection, in turn, put the seal into the runway, spacer ring, cover plate, the screw fastening on glue before all bolts. Seal replacement. Into the sealed cavity injection EP2 continuously, the access cover (s) in the EP2 overflow, to cover a circle are EP2 overflow, and then continue to inject HBW, observe HBW overflow, stay EP2 HBW and uniform overflow, before turning the knife dish.