JPS61257499A - Electrolytic cleaning device - Google Patents

Abstract

PURPOSE:To make up the deficiency of the electrolysis in the edge parts to a steel sheet and to remove satisfactorily fats and oils from the entire surface of the steel sheet by dividing the ends of anode and cathode electrodes to a plurality in the moving direction of the steel sheet and changing the quantity of the electric current flowing between the divided electrodes. CONSTITUTION:The respective ends of the anode electrode 2 and cathode electrode 3 are divided to plural pieces along the moving direction of the steel sheet 1 to form divided anodes 2a and divided cathodes 3a. The electric current is transmitted from the anode 2 through the electrolyte to the sheet 1 and flows again through the inside of the electrolyte to the cathode 3 when the steel sheet 1 to which a rolling mill lubricant sticks passes between both electrodes 2 and 3. The fats and oils sticking to the surfaces of the sheet 1 are removed in this stage. The current flowing from the divided anode electrodes 2a passes the edge parts of the sheet 1 and flows toward the divided cathode electrodes 3a. The current density in the edge parts of the sheet 1 is thereby increased and the rate of electrolysis is increased. The fats and oils are thus effectively removed in said parts.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves passing a rolled steel plate in an alkaline liquid between anodes and cathodes, and electrolyzing the alkaline liquid on the surface of the steel plate to remove fats and oils on the surface of the steel plate. The present invention relates to an electrolytic cleaning device for cleaning.

[Prior Art] An example of a conventional electrolytic cleaning apparatus of this type will be described with reference to FIGS. 3 and 4. In the figure, 11 is a steel plate, 12 is an anode tube (book), 13 is a cathode electrode, 1/I is a zinc roll, 1
5 is an edge mask.

In such a structure, the steel plate 11 whose surface is coated with rolling oil used during rolling is supported by a zinc roll 14 installed in an alkaline liquid tank (not shown) and passes between the anode and cathode. Between the anode and cathode, current passes from the anode electrode 12 through the steel plate 11 and flows to the cathode electrode 13. At this time, the alkaline liquid is electrolyzed (hereinafter referred to as electrolysis) on the surface of the steel plate 11, and bubbles of hydrogen and oxygen are generated. The air bubbles remove fats and oils adhering to the surface of the steel plate 11.

[Problems to be solved by the invention] As described above, in the conventional electrolytic cleaning device, the electric current flows in the thickness direction of the steel plate 11, so the electrical resistance in the steel plate 11 is small.
It has the advantage that less electric power is required for electrolysis. However, as shown in Figure 4, the current flows around the outside of the steel plate 11 at the edge portion, so the amount of electrolysis on the surface of the steel plate decreases in this area, making it impossible to remove oil and fat sufficiently. There are drawbacks. In order to solve this drawback, an edge mask 15 is installed between the anode and cathode electrodes in FIG. 4 to prevent current from flowing in this area. It is difficult to get close enough and there is no satisfactory solution.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electrolytic cleaning device that can compensate for the lack of electrolysis at the edge portions of a steel plate and can effectively remove oil and fat from the entire surface of the steel plate.

Means for Solving Problem L] The present invention is characterized by taking the following measures in order to solve the above problems and achieve the object. That is,
In an electrolytic cleaning device that passes a rolled steel plate between anode and cathode electrodes facing each other in an alkaline solution, and cleans fats and oils from the steel plate by electrolysis of the alkaline solution on the surface of the steel plate, the anode and cathode It is characterized in that the end of the electrode is divided into a plurality of parts along the moving direction of the steel plate, and the amount of current flowing between the divided electrodes is changed.

[Function] By modifying such means, it becomes possible to increase the current density in the edge portion of the steel plate where the electrolysis decreases.

[Example] Fig. 1 is a schematic configuration diagram showing an embodiment of an electrolytic cleaning apparatus according to the present invention, and Fig. 2 is a diagram for explaining the operation of the embodiment. In the figure, 1 is a steel plate, 2 is an anode electrode, 2a is a divided anode electrode in which the end of this anode and cathode electrode 2 is divided into a plurality of pieces along the moving direction of the steel plate 1, 3 is a cathode electrode, and 3a is this cathode. A split cathode type (Φ) in which the end of the electrode 3 is divided into a plurality of parts along the direction of movement of the steel plate 1, 4 is a zinc roll installed in an alkaline tank (not shown), and 5 is an edge mask.

In the structure as described above, the steel plate 1 coated with rolling oil passes between the anode and cathode electrodes 2.3. At this time, between the anode electrode 2 and the cathode electrode 3, a current flows from the anode electrode 2 through the alkaline solution to the steel plate 1, passes through the alkaline solution again, and flows to the cathode electrode 3. At this time, the alkaline liquid is electrolyzed on the surface of the steel plate 1, generating hydrogen and oxygen bubbles. The air bubbles remove fats and oils adhering to the surface of the steel plate 1. On the other hand, the current flowing from the divided anode electrode 2a passes through the edge portion (end) of the steel plate 1 and flows to the divided cathode electrode 3a.

This increases the current density at the edge of the steel plate 1,
Since the amount of electrolysis increases, fats and oils are effectively removed in this area. In contrast, in the conventional continuous anode and cathode electrodes 12.13, the electrolysis flows around the steel plate at the edges.
However, there was a drawback that the current density in this part decreased. For this reason, it becomes possible to remove oil and fat from the entire surface of the steel plate 1, which has not been possible with conventional electrolytic cleaning equipment.

[Effects of the Invention] As described above, the present invention allows a rolled steel plate to pass between positive and negative electrodes facing each other in an alkaline liquid, and electrolyzes the alkaline liquid on the surface of the steel plate to achieve the above-mentioned effect. In an electrolytic cleaning device for cleaning oil and fat from a steel plate, the ends of the anode and cathode electrodes are divided into a plurality of parts in the direction of movement of the steel plate, and the amount of current flowing between the divided electrodes is changed. This is a characteristic feature.

Therefore, according to the present invention, the current from the anode electrode is concentrated at the edge portion of the steel plate and then flows through the steel plate to the cathode electrode, so that the current density at the edge portion of the steel plate increases and the amount of electrolysis increases. , it is possible to provide an electrolytic cleaning device that can effectively remove fats and oils from this area.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an electrolytic cleaning device according to the present invention, FIG. 2 is a diagram for explaining the operation of the embodiment,
FIG. 3 is a schematic configuration diagram showing an example of a conventional electrolytic cleaning device;
FIG. 4 is a diagram for explaining the operation of FIG. 3. DESCRIPTION OF SYMBOLS 1... Steel plate, 2... Anode electrode, 2a... Split anode electrode, 3... Cathode electrode, 3a... Split cathode electrode, 4
...Zinchlor, 5...Etsujimask. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 11 Kaisho 6l-257499 (3) Figure 3 Figure 4

Claims (1)

[Claims] In an electrolytic cleaning device that passes a rolled steel plate between anode and cathode electrodes facing each other in an alkaline solution, and cleans fats and oils from the steel plate by electrolysis of the alkali solution on the surface of the steel plate, the anode and cathode electrodes An electrolytic cleaning device characterized in that an end portion of the steel plate is divided into a plurality of electrodes along the moving direction of the steel plate, and the amount of current flowing between the divided electrodes is changed.