JP2007246936A - Method and apparatus for continuously cleaning steel sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for continuously and effectively cleaning a steel sheet without using an alkaline solution. <P>SOLUTION: The steel sheet S is continuously cleaned by spraying superheated steam to both surfaces of the continuously traveling steel sheet S by a superheated steam spray gun 1, then brushing both surfaces of the steel sheet S by brush rolls 2a, and further, atomizing water to both surfaces of the steel sheet S by a water sprayer 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention, for example, in a continuous annealing line or continuous molten metal plating line of a steel sheet, cleans and removes foreign matter such as rolling oil or iron powder attached to the steel sheet before annealing or plating. And an apparatus.

  Cold-rolled steel sheets and hot-rolled steel sheets are usually passed through the continuous annealing line and the continuous molten metal plating line. In the cold-rolled steel sheet and hot-rolled steel sheet, rolling oil injected for cooling and lubrication of the roll and steel sheet during rolling, and foreign matters such as machine oil, iron powder, and dust adhere to both surfaces. If these oils and foreign substances remain attached to the steel sheet, the processing line in the subsequent process is damaged, and if it remains in the product, the surface becomes dirty and the commercial value of the steel sheet is impaired. Therefore, it is necessary to continuously wash the steel plate and remove the adhered oils and foreign matters before the subsequent process.

  Conventionally, as described in Patent Document 1, as a continuous cleaning method for a steel plate, the steel plate is immersed in an alkaline solution such as NaOH as a cleaning solution, and an electric solution of the alkaline solution is formed by electrodes disposed in close proximity to both surfaces of the steel plate. Decompose and generate hydrogen and oxygen bubbles from both sides of the steel sheet, and perform electrolytic cleaning to lift and remove dirt by these bubbles, or spray an alkaline solution as a cleaning solution on both sides of the steel sheet, and at the same time with a brush roll A method of brushing both surfaces of a steel plate is generally employed.

However, as described above, the conventional cleaning method uses an alkaline solution as a cleaning liquid, and thus has a problem that its waste liquid treatment is necessary. In addition, since the cleaning liquid circulates and is used for a certain period of time, there is also a problem that the cleaning ability is reduced due to the progress of dirt. Furthermore, since an alkaline solution is used as the cleaning liquid, the generation of bubbles is unavoidable, and there is also a problem that bubbles overflow in the cleaning tank and the cleaning liquid circulation tank and the working environment is deteriorated. In addition, in the case of the electrolytic cleaning method, there is a problem that equipment cost and running cost are increased.
JP-A-9-59789

  The problem to be solved by the present invention is to provide a method and an apparatus for continuously cleaning a steel sheet effectively without using an alkaline solution.

  In order to solve the above problems, in the present invention, the steel sheet is cleaned by spraying superheated steam on both surfaces of the steel sheet without using an alkaline solution as the cleaning liquid.

  That is, the steel sheet continuous cleaning method of the present invention is characterized in that superheated steam is sprayed on both surfaces of a continuously traveling steel sheet to continuously clean the steel sheet.

  Further, the continuous cleaning apparatus for a steel sheet of the present invention is a continuous cleaning apparatus for a steel sheet that continuously cleans both surfaces of a continuously traveling steel sheet, and is provided with a superheated steam sprayer that sprays superheated steam on both surfaces of a continuously traveling steel sheet. It is what.

  The superheated steam used in the present invention is high-temperature steam at 100 ° C. or higher, which is heated by further adding heat to saturated steam. In this invention, this superheated steam is sprayed on both surfaces of a steel plate, and oils, such as rolling oil and machine oil adhering to both surfaces of a steel plate, are heated and vaporized and removed. At the same time, foreign matters such as iron powder adhering to both surfaces of the steel plate are also washed away with superheated steam and removed.

  In the present invention, in order to more reliably remove foreign substances such as iron powder adhering to both sides of the steel plate, spraying superheated steam on both sides of the continuously running steel plate, then brushing both sides of the steel plate with a brush roll, Furthermore, it is preferable to continuously wash the steel sheet by spraying water on both sides of the steel sheet. As an apparatus configuration for this purpose, a brush scrubber having a plurality of brush rolls arranged on both surfaces of the steel plate is provided on the downstream side of the superheated steam sprayer, and water is sprayed on both surfaces of the steel plate on the downstream side of the brush scrubber. Provide a sprayer. By adopting such a configuration, foreign matters such as iron powder remaining after washing by spraying superheated steam are scraped off by a brush roll and washed away by spraying water.

  The superheated steam used in the present invention has a boiling point of about 200 to 300 ° C. of oils such as rolling oil and machine oil adhering to the steel sheet. Preferably, the temperature is about 500 ° C.

  According to the present invention, the following effects can be obtained by cleaning the steel sheet by spraying superheated steam on both surfaces of the steel sheet without using an alkaline solution as the cleaning liquid.

1. Since an alkaline solution as a cleaning liquid is not required and the waste liquid treatment is not required, the running cost can be reduced.

2. The problem of a decrease in cleaning ability due to deterioration of the alkaline solution as the cleaning liquid is eliminated, and the cleaning ability is stabilized.

3. The cleaning process does not require electrolysis, and the equipment configuration is simplified, thereby reducing the equipment cost.

4). Conventionally, there is no generation of bubbles seen when an alkaline solution is used as the cleaning liquid, and the working environment can be prevented from deteriorating.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is an apparatus configuration diagram showing an embodiment of a continuous cleaning apparatus for steel sheets according to the present invention.

  In FIG. 1, the superheated steam sprayer 1, the brush scrubber 2, the water sprayer 3, and the dryer 4 are arrange | positioned in order along the plate | board passing direction of the steel plate S. FIG.

  The superheated steam sprayer 1 is supplied with superheated steam obtained by heating the steam with the superheater 5. This superheated steam is introduced into the header pipe 1a disposed on both sides of the steel sheet S, and is sprayed onto both sides of the steel sheet S from a plurality of nozzles 1b connected to the header pipe 1a.

  The brush scrubber 2 has a plurality of brush rolls 2a disposed on both sides of the steel plate, and the brush roll 2a brushes both sides of the steel plate S to scrape off foreign matters such as iron powder attached to the steel plate S. At the outlet of the brush scrubber 2, a drainer ringer roll 2b is provided. Moreover, you may provide the some nozzle which sprays water on both surfaces of the steel plate S in the brush scrubber 2 as needed.

  Hot water is supplied to the water sprayer 3, and this hot water is introduced into the header pipe 3 a disposed on both sides of the steel plate S, and sprayed on both sides of the steel plate S from a plurality of nozzles 3 b connected to the header pipe 3 a. . At the outlet of the water sprayer 3, a ringer roll 3c for draining water is provided.

  Hot air is supplied to the dryer 4, and this hot air is introduced into the header pipe 4 a disposed on both sides of the steel plate S, and blown onto both sides of the steel plate S from a plurality of nozzles 4 b connected to the header pipe 4 a. .

  In the above configuration, first, the steel sheet S is passed through the superheated steam sprayer 1, and superheated steam is sprayed on both surfaces of the steel sheet S. Thereby, oils, such as rolling oil and machine oil adhering to both surfaces of a steel plate, are removed by heating and vaporization. At the same time, foreign matters such as iron powder adhering to both surfaces of the steel plate are also washed away with superheated steam and removed.

  Thereafter, the steel plate S is passed through the brush scrubber 2. In the brush scrubber 2, both surfaces of the steel plate are brushed by the brush rolls 2a disposed on both surfaces of the steel plate S. Thereby, foreign matters such as iron powder remaining on both surfaces of the steel sheet S are scraped off. Next, the steel plate S is passed through the water sprayer 4, and foreign matters such as iron powder on the steel plate S are washed away by the hot water. Finally, the steel plate S is passed through the dryer 4, and the moisture on the steel plate S is completely dried and removed.

  Thus, according to the present invention, it is possible to effectively continuously clean the steel sheet S without using an alkaline solution as a cleaning liquid.

  FIG. 2 conceptually shows a comparison of the change over time of the cleaning effect of the electrolytic cleaning + brush cleaning using the alkaline solution of the prior art with the embodiment of the present invention shown in FIG.

  In the present invention, since the fresh superheated steam is always poured, the cleaning effect is constant. On the other hand, in the prior art, the cleaning liquid deteriorates, and the cleaning liquid needs to be replaced about once a month.

  Further, in the present invention, superheated steam is used, and oils such as machine oil can be efficiently removed by vaporization. Therefore, the cleaning effect is higher than that in the prior art when the cleaning liquid is a new liquid.

  INDUSTRIAL APPLICABILITY The present invention can be used for a cleaning process as a pre-process for various steel sheet processes such as a continuous annealing line for steel sheets and a continuous molten metal plating line.

It is an apparatus block diagram which shows one Example of the continuous washing apparatus of the steel plate which concerns on this invention. FIG. 1 conceptually shows a comparison between the embodiment of the present invention shown in FIG. 1 and the change over time in the cleaning effect of electrolytic cleaning and brush cleaning using an alkaline solution of the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Superheated steam sprayer 1a Header pipe 1b Nozzle 2 Brush scrubber 2a Brush roll 2b Ringer roll 3 Water sprayer 3a Header pipe 3b Nozzle 4 Dryer 4a Header pipe 4b Nozzle 5 Superheater S Steel plate

Claims (4)

  A continuous steel plate cleaning method in which superheated steam is sprayed on both sides of a continuously running steel plate to continuously wash the steel plate.   A continuous steel plate cleaning method in which superheated steam is sprayed on both surfaces of a continuously traveling steel plate, and then both surfaces of the steel plate are brushed with a brush roll, and further, water is sprayed on both surfaces of the steel plate to continuously clean the steel plate.   A steel plate continuous cleaning apparatus for continuously cleaning both surfaces of a continuously traveling steel plate, wherein the steel plate is continuously cleaned with a superheated steam sprayer for spraying superheated steam on both surfaces of the continuously traveling steel plate.   The brush scrubber which has the some brush roll arrange | positioned on both surfaces of a steel plate is provided in the downstream of the superheated steam sprayer, The water sprayer which sprays water on both surfaces of a steel plate is provided in the downstream of the brush scrubber. A continuous cleaning apparatus for steel sheets according to 1.

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