Method for prolonging service life of air door of secondary cooling draught fan

Abstract

The invention discloses a method for prolonging the service life of an air door of a secondary cooling draught fan, and belongs to the technical field of steelmaking and continuous casting. The method comprises the specific steps of adding fan blade reinforcing ribs (8) on a draught fan blade, and changing a rotating main shaft into a long shaft, wherein the rotating main shaft (4) is changed into the long shaft, a fan blade shaft (2) is connected with the rotating main shaft (4), and the fan blade shaft and the rotating mains haft (4) can be limited and fixed by using a fastening bolt; firstly filling a gap between a main shaft sleeve (3) and the rotating main shaft (4) with glycerin, then filling a gap between a packing groove of the main shaft sleeve and the rotating main shaft (4) with a packing seal (6) according to a field actual situation, then connecting the packing seal (6) with the rotating main shaft (4) through a pressing bolt of a gland flange (7) after the last circle of packing is completely filled, and tightly pressing the gland flange (7) by adjusting the pressing bolt, wherein the gap is completely prevented from being blocked by steel slag and dust, and the opening of the air door of the secondary cooling draught fan is enabled to range from 0-100%. The method for prolonging the service life of the air door of the secondary cooling draught fan, disclosed by the invention, has the advantages that the welding strength of a blade and a blade shaft of the air door is increased, and the phenomenon of an existing design that a rotor of a draught fan is damaged caused by the falling off of the blade of the air door due to insufficient welding strength is avoided.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, and in particular provides a method for prolonging the service life of a damper of a secondary cooling fan. Background technique [0002] The secondary cooling fan is one of the important auxiliary equipment of the continuous casting machine. In the production process of the continuous casting machine, in order to prevent the high-temperature steam generated when the billet is sprayed with water from spreading to the surroundings, it is installed on both sides of the secondary cooling room of the fan section. A secondary cooling fan and corresponding pipelines. When the slab undergoes secondary cooling, a large amount of steam generated in the sealed chamber is pumped out by the fan and discharged outside the factory building through the pipeline, so as to prevent the high-temperature steam from corroding the sector body equipment, hydraulic pipelines, sector electric a...

AI Technical Summary

Problems solved by technology

Solved the original design of the damper of the secondary cooling fan, such as the low connection strength between the damper blade and the damper rotating shaft, insufficient welding strength of the damper blade, and insufficient closure of the damper when the fan is started.

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