Blast furnace air inlet pipeline mounting method and hydraulic system

Abstract

The invention discloses a blast furnace air inlet pipeline mounting method and a hydraulic system. The blast furnace air inlet pipeline mounting method comprises the following steps: carrying out buttjoint on an air hose flange and a descending pipe flange; enabling a piston rod in a stretching state of a hydraulic cylinder to penetrate through the air hose flange and the descending pipe flange,and connecting a locking piece on the piston rod to prevent the piston rod from be removed out of a threaded hole; controlling the piston rod to shrink to enable the air hose flange and the descendingflange to be in tight coupling and keep the tight coupling state under extrusion of the locking piece and a cylinder block; except the threaded hole allowing the piston rod to penetrate through, enabling bolts to penetrate through other threaded holes of the air hose flange and the descending pipe flange, and enabling the bolts to pre-tighten the air hose flange and the descending pipe flange; controlling the piston rod to stretch out to remove extrusion of the hydraulic cylinder to the air hose flange and the descending pipe flange and enabling the air hose flange and the descending pipe flange to keep the tight coupling state under the connection of the bolts. According to the blast furnace air inlet pipeline mounting method, the hydraulic cylinder compresses two butt joint flanges, sothat both labor and time are saved during the mounting process, and the overhauling efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a method for installing an air inlet pipeline of a blast furnace, and also relates to a hydraulic system suitable for the installation method of the air inlet pipeline of a blast furnace. Background technique [0002] The air inlet pipeline of the blast furnace generally adopts an air duct to connect the downcomer below the annular surrounding pipe of the blast furnace body to send hot blast into the furnace for blast furnace smelting. Due to the high smelting intensity and temperature of the blast furnace, it is easy to cause the three sets of tuyeres at the air inlet of the blast furnace to burn out. At the same time, the air duct is a fragile part. The superposition of these factors leads to the frequent shutdown of the blast furnace to replace the three sets of tuyeres. and air ducts. For some blast furnaces, due to the limited operating space, the disassemb...

AI Technical Summary

Problems solved by technology

During this process, when tightening eight M42 bolts with an M42 extension wrench, at least four people need to apply force to the extension wrench at the same time to tighten the bolts on the flange one by one, that is, The air pipe flange and the downcomer flange are gradually tightly connected by manually screwing the bolts to compress the metal gasket. This operation method is not only labor-intensive but also takes a long time to tighten, and the maintenance efficiency is relatively low, which seriously affects the economy of the blast furnace. benefit and social benefit

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