A jet descaling device and method for removing scales on the inner wall of metal pipes

Abstract

The invention discloses a jet descaling device and a jet descaling method for removing scales on the inner wall of a metal tube. The jet descaling device comprises a support rod and at least two jet nozzle units. The support rod is arranged along the internal center axis of the metal tube. The jet nozzle units are in front-back arrangement along the length direction of the support rod. Each jet nozzle unit is provided with at least two mixing jet nozzles which are arranged evenly along the circumference of the support rod in a mode of spreading to all directions with the axis of the support rod as the circle center. The mixing jet nozzles of the nozzle units in the front-back arrangement are in front-back staggered arrangement in all directions to form a mixing jet nozzle matrix, and an enclosed and round effective descaling area capable of covering the circumferential surface of the inner wall of the metal tube is formed. The jet descaling device descales the surfaces of the inner walls of metal tubes continuously, efficiently, stably and greenly.

Description

technical field [0001] The invention belongs to jet descaling technology, in particular to a jet descaling device and method for removing scales on the inner wall of metal pipes. Background technique [0002] During the hot rolling or heat treatment process of metal materials, a dense covering composed of metal oxides will be formed on the surface, commonly known as "scale". The existence of this scale will affect further processing: on the one hand, the material The surface cracks on the surface are not easy to be found in advance, so that there are quality problems in the finished product; on the other hand, it is easy to press the scales into the metal surface, causing surface quality problems; in addition, the existence of hard oxides will accelerate the rolling or drawing. At the same time, it brings difficulties to the anti-corrosion treatment of the bar before actual use; in addition, for special steel bars, in order to expose the surface quality defects of the steel ...

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Problems solved by technology

[0008] By consulting relevant patents, it is also found that foreign countries, especially Japan, Germany and other developed countries with metallurgical technology, although they have proposed numerous continuous jet, grinding and brushing descaling technologies such as Japanese patent JP06108277A discloses the use of acid spraying and brushing on the continuous cold rolling line. The descaling process used in combination of rollers, Japanese patent JP55034688A discloses a combined PV rolling descaling-mixed abrasive high-pressure jet descaling method, Japanese patents JP57142710A, JP57068217A, JP59097711A, and the Canadian TMW company since 2001. A series of cleaning technologies for steel plate surface scales, such as U.S. Patents US20080108281 (A1), US20080182486 (A1) and US20090227184 (A1), etc. In addition, U.S. Patent No. Technology for removing scale from the surface of rods and wires

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