Flame cutting machine nitrogen accompanying purging system and method

Abstract

The invention relates to a flame cutting machine nitrogen accompanying purging system and method. The system comprises a metal hose, a high-pressure nitrogen hard pipe, spray nozzles and a fixing device; the high-pressure nitrogen hard pipe is fixed to the front / back position of a flame cutting machine cutting torch in the casting direction of a cast blank through connection of the metal hose; andthe spray nozzles at the tail end of the high-pressure nitrogen hard pipe act on the position of oxides, in a molten state, on the cast blank at the specified heights, intervals and included angles.The method includes the steps that the flame cutting machine nitrogen accompanying purging system is assembled; and an nitrogen source is opened, the spray nozzles of the flame cutting machine nitrogen accompanying purging system rapidly cool oxidative products which are in a molten state and are generated through flame cutting through a continuous high-pressure high-speed nitrogen stream, and thetwo ends of slits are stripped under impact and purging of the nitrogen stream. By means of the flame cutting machine nitrogen accompanying purging system and method, the cut end faces are more smooth and flatter, information is fed back simultaneously according to continuous rolling, and the amount of repair caused by hot rolling roll head and tail scab defects is decreased substantially.

Description

technical field [0001] The invention relates to a purging system, in particular to a nitrogen accompanying purging system and method for a flame cutting machine. Background technique [0002] There are many high-pressure gas impurities in the high-pressure gas pipe network and flame cutting machines in the slab continuous casting machine cutting area of ​​iron and steel enterprises, and the purity and pressure cannot meet the requirements; the cutting machine equipment is outdated and the stability of the body is poor. , when a large amount of oxidized slag is attached to the cutting end face, and the existing deburring machine and hot rolling descaling equipment cannot effectively remove the oxidized slag on the end face of the slab, and it is easy to produce hot-rolled coil head and tail knots during the rolling process. Scar defects, and adversely affect the life of the roll. For example, a large amount of "returning slag" formed on the end face of the slab (inner arc di...

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Problems solved by technology

[0003] Aiming at the disadvantages of the existing technology, which is easy to produce scarring at the head and tail of the hot-rolled coil, and adversely affects the life of the roll, the technical problem to be solved by the present invention is to provide a flame cutting machine that can make the cutting end surface smooth and level with nitrogen blowing. scan system

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