An annular air blowing device for removing residual water and scale in steel pipes

Abstract

The invention provides a new annular air blowing device for removing residual water and iron oxide scale in steel pipes. It includes a plurality of air blowing nozzle ring assemblies arranged in a row along the transportation direction of the steel pipe, so that the steel pipe passes through each air blowing nozzle in turn. The annular air blowing body on the ring assembly is provided with a plurality of air blowing nozzles arranged in an orderly manner toward the forward direction of the pipeline. When the tail end of the steel pipe passes through the annular air blowing body, multiple air blowing nozzles The air blowing nozzle blows high-pressure gas into the steel pipe at the same time, which can ensure a more comprehensive purging coverage. At the same time, the tail end of the steel pipe can accept the sweeping by the air blowing nozzle every time it passes through an air blowing spray ring assembly. This kind of air blowing nozzle opens one by one in a relay manner to effectively completely remove the residual water and iron oxide scale in the pipe.

Description

Technical field: [0001] The invention relates to the technical field of production of hot-rolled seamless steel pipes, in particular to an air blowing device for removing residual water and iron oxide scales in the pipes for hot-rolled seamless steel pipes treated by a controlled cooling process. Background technique: [0002] In the production process of hot-rolled seamless steel pipes, iron oxide scales are likely to remain on the inner surface of the steel pipes, resulting in insufficient precision of the inner surface, and the peeling of the iron oxide scales will also cause the problem of clogging the pipeline. Although the subsequent use of controlled cooling technology can significantly improve the appearance of the pipe The microstructure improves the comprehensive mechanical properties. However, during the cooling process, due to the special annular interface characteristics of the pipe, the cooling water is also easy to enter the inside of the steel pipe and stay in...

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Problems solved by technology

[0002] In the production process of hot-rolled seamless steel pipes, iron oxide scales are likely to remain on the inner surface of the steel pipes, resulting in insufficient precision of the inner surface, and the peeling of the iron oxide scales will also cause the problem of clogging the pipeline. Although the subsequent use of controlled cooling technology can significantly improve the appearance of the pipe The microstructure improves the comprehensive mechanical properties. However, during the cooling process, due to the special annular interface characteristics of the pipe, the cooling water is also easy to enter the inside of the steel pipe and stay in it, resulting in uneven cooling. In order to avoid the remaining cooling water inside the steel pipe and oxidation The adverse effect caused by the iron sheet, the existing air blowing device includes a nozzle, the center line of the outlet of the nozzle is parallel to the axis of the steel pipe and set close to the bottom wall of the inner surface of the steel pipe, blowing high-pressure gas into the pipe, but Due to the positional relationship between the nozzle and the pipeline, the air blowing device can not fully cover the inner surface of the steel pipe when blowing high-pressure gas into the pipe, and can only perform one blowing action on the steel pipe passing through the air blowing device. Insufficient strength can also easily lead to incomplete cleaning of the residual water and iron oxide scale in the steel pipe, thus affecting the performance of the final product

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