Electrolytic cleaning device for cold-rolled strip steel high-speed cleaning line

Abstract

The invention discloses an electrolytic cleaning device of a cold-strip steel high-speed cleaning line. The electrolytic cleaning device comprises electrolytic cells. The electrolytic cleaning device is characterized in that more than two sets of electrolytic cells, and more than two sets of plate electrodes, high-pressure shower pipes and sinking rollers arranged in the electrolytic cells are arranged in parallel; an overall transition groove is formed in the upper part of each of the more than two sets of electrolytic cells arranged in parallel; a turning roller is arranged inside each transition groove; a strip steel inlet and a strip steel outlet are arranged at the front end and the rear end of each transition groove; a steam exhaust port is formed in the top part of each transition groove; the plate electrodes inside the more than two sets of electrolytic cells arranged in parallel are respectively arranged according to the plate electrodes with positive and negative polarities; and the electrolytic cell with a negative plate electrode is arranged at the last position of all electrolytic cells which are arranged in parallel. The electrolytic cleaning device disclosed by the invention is good in cleaning effect; hydrogen of permeating into the strip steel in the cleaning process can be effectively removed; the hydrogen embrittlement phenomenon is avoided; and the quality of the strip steel after electrolytic cleaning is prevented from being affected.

Description

technical field [0001] The invention relates to a strip steel cleaning device, in particular to an electrolytic cleaning device for a cold-rolled strip steel high-speed cleaning line. Background technique [0002] The electrolytic cleaning device is an important component equipment in the strip steel cleaning equipment (often called the wet section in steel mills), and a strip steel cleaning line is composed of multiple single equipment. It generally consists of equipment such as alkali spraying, alkali rinsing, electrolytic cleaning, high-pressure water cleaning, high-pressure water spraying, water scrubbing, and drying. , tin plating, chrome plating, and color coating are ready. [0003] The oil stains and impurities of cold-rolled strip steel are generally caused by the rolling oil deposition of the strip steel during the rolling process, the iron powder produced by the surface friction during rolling, the dust accumulated on the strip steel, the smoke and dust produced ...

AI Technical Summary

Problems solved by technology

[0006] The speed of the early strip cleaning production line was low, but with the advancement of technology, the speed of the strip cleaning production line is getting higher and higher, from the original 200 m / min to 600 m / min (400 m / min is high speed), Such high-speed cleaning has three problems that need to be studied and solved: (1) The influence of current density and the relative residence time of the strip in the electrode on the removal of oil stains; the current density is large and the degreasing speed is fast, but the current density and degreasing speed are not the same. Not directly proportional, when the current density increases to a certain level, the increase in degreasing speed will not be obvious, but excessively increasing the current density will increase the power consumption, so the current density is generally kept within a certain range, and the strip is in the electrode The internal residence time is proportional to the speed of removing oil stains, but as the strip speed increases, the residence time of the strip steel in the electrode becomes shorter, which affects the effect of removing oil stains

(2) When the strip steel is positive (anode) pole, it is called negative (cathode) pole degreasing; when the strip steel is negative (cathode) pole, it is called positive (positive) pole degreasing; Oil will generate a large amount of hydrogen on the surface of the strip. Compared with the positive (anode) degreasing, the steam drum produced by the negative (cathode) degreasing is small and the number is large, so its degreasing effect is good, but the hydrogen produced It will penetrate into the strip steel, increasing the possibility of hydrogen embrittlement of the strip steel, and the hydrogen permeates into the strip steel, which is easy to precipitate and cause small bubbles in the subsequent coating process, which affects the quality of the coating.

(3) The increase of the speed of the strip will increase the atomization of the electrolyte and generate a large amount of steam, which will make it difficult to seal the electrolytic cell

This electrolytic cleaning tank is suitable for the cleaning production line with low strip speed. When the strip speed is higher than 200 m / min, the cleaning effect will be greatly reduced and cannot meet the cleaning quality requirements.

Now the cleaning line speed required by the customer must reach 600 m / min, so the existing strip cleaning line is far from meeting the production requirements

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