Method for automatically changing slag line of tundish submersed nozzle for ultra-thick plate blank casting machine

Abstract

A method for automatically changing a slag line of a tundish submersed nozzle for an ultra-thick plate blank casting machine belongs to the technical field of plate blank continuous casting. The process steps are: installing a position sensor on a hydraulic cylinder of a tundish trolley and obtaining average values of actual level of the tundish trolley in a steel pouring process through numerical values reflected by the position sensor; installing an automatic liquid lever measuring meter on a crystallizer, and obtaining actual crystallizer level in the steel pouring process through a crystallizer liquid level automatic measuring system; installing the submersed nozzle on the tundish trolley, and measuring the distance between the bottom of the tundish trolley and the top of the submersed nozzle; lowering the tundish trolley to a lowest position, and measuring the distance between the bottom of the tundish trolley and the top of a crystallizer copper plate; inputting a formula for calculating actual immersion depth of the submersed nozzle in the steel pouring process into a software program of the casting machine, setting time intervals and changing amount of each time of height changing of the tundish trolley in an automatic system of the casting machine and achieving the operation of automatic slag line changing of the submersed nozzle. The method has the advantages of prolonging service life of the tundish submersed nozzle of the casting machine.

Description

technical field [0001] The invention belongs to the technical field of slab continuous casting, and provides a method for an extra-thick slab caster using a tundish-immersed nozzle to automatically change the slag line. Nozzle life. Background technique [0002] The submerged nozzle of the tundish plays multiple roles in the continuous casting production, such as diverting flow, preventing secondary oxidation, stabilizing the molten steel flow field in the crystallizer, improving the quality of the billet, and preventing slag rolling and steel breakout. For the 400mm extra-thick slab caster, the surface and internal quality requirements of the slab are very high, and the use of the submerged nozzle of the tundish should be protected and poured. However, several factors should be considered in the process of use: (1) The short service life of the submerged nozzle of the tundish affects the small number of continuous casting furnaces of the continuous casting machine, so that...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for using a tundish submerged nozzle to automatically change the slag line of an extra-thick slab caster, which solves the problem of accuracy deviation caused by manual operation, which affects the melting and consumption of mold slag, and thus also affects the casting process. billet quality problem

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