Nitrogen purging device behind plate strip finishing mill

Abstract

The invention relates to a rear nitrogen purging device behind a plate strip finishing mill. The device is arranged behind the finishing end mill and comprises a gas supply main pipe and a plurality of headers connected with the gas supply main pipe, wherein the headers are uniformly arranged above a roller table along a rolling direction. Pipe clamps are arranged on the headers in a buckled mode,the pipe clamps are connected with a pipe clamp cushion plate below the headers through hexagonal bolts, the headers are fixed, and multiple complete-cone nozzles are evenly arranged at the bottoms of the headers. A nitrogen pipeline is connected through a nearby nitrogen point valve box, the headers and the nozzles are installed, power sources such as hydraulic pressure and electric power are not needed, nitrogen purging is easily and efficiently carried out on the surface of the strip steel without dismounting the existing pipeline and the like, construction is simple, operation is convenient, labor is saved, time is saved, safety and efficiency are realized, isolation between the strip steel and air is realized, the problem that the secondary scale on the surface of the strip steel istoo thick is effectively solved, the production of the secondary scale is controlled, the surface smoothness of the strip steel is improved, and the surface quality of the strip steel is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary devices, and in particular relates to a nitrogen purging device after a strip finishing mill. Background technique [0002] The oxide scale produced after the strip steel is heated by the heating furnace is the primary scale or the furnace-grown scale. After the strip is removed from the furnace, the primary scale is removed after high-pressure descaling, and the scale produced again is the secondary scale or the secondary scale. The problem of secondary oxide scale in the hot-rolled strip production line has always been an important factor restricting the improvement of the surface quality of the strip. That is, the temperature of the finished strip is usually between 800-950°C. After the size and shape of the strip are detected by a multi-function instrument , the strip steel enters the layer cooling area, and after being sprayed by the upper and lower headers of the layer coolin...

AI Technical Summary

Problems solved by technology

However, with fan blowing, the secondary oxidation speed of the strip is fast, and the secondary oxide scale is thicker. At the same time, the power consumption of the blower is large, and the blowing noise is large, which affects the site environment.

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