KR101461474B1 - Apparatus for cleaning strip and electrolytic cleaning line - Google Patents

Abstract

According to one embodiment of the present invention, the steel sheet cleaning apparatus includes a scrubber installed on upper and lower portions of a steel sheet to be unidirectionally conveyed and scrubbing the steel sheet; A spray nozzle connected to the scrubber to supply a cleaning fluid to the steel plate; A cleaning fluid supply line connected to the injection nozzle for supplying a cleaning fluid to the injection nozzle; An alkaline solution supply line connected to an alkaline storage tank for containing an alkaline solution therein and supplying the alkaline solution to the cleaning fluid supply line; A rinsing tank for rinsing foreign matter remaining on the surface of the steel sheet passed through the scrubber using pure water; A pure water circulation line connected to the rinsing tank for supplying the pure water to the cleaning fluid supply line; An alkaline liquid flow rate regulator provided on the alkaline liquid supply line for regulating the flow rate of the alkaline liquid supplied to the cleaning fluid supply line; A pure water flow rate regulator installed on the pure water circulation line for regulating a flow rate of the pure water supplied to the cleaning fluid supply line; And a controller connected to the alkaline liquid flow controller and the pure water flow controller to control the alkaline liquid and the pure water at a predetermined ratio.

Description

[0001] APPARATUS FOR CLEANING STRIP AND ELECTROLYTIC CLEANING LINE [0002]

The present invention relates to a steel sheet cleaning apparatus and an electrolytic cleaning apparatus, and more particularly, to a steel sheet cleaning apparatus and an electrolytic cleaning apparatus which adjust the amount of an alkaline solution sprayed on a scrubber for mechanical cleaning of a steel sheet in a clean electrolytic apparatus, To a steel sheet cleaning apparatus and an electrolytic cleaning apparatus which ensure cleanliness of a steel sheet.

Generally, according to a rolling strip manufacturing process of a steel mill, a steel strip is manufactured by hot rolling a slab manufactured in a casting process to produce a steel plate, removing scale of the steel plate, and performing cold rolling, A plurality of passes of cold rolling are performed in order to make the strip have a predetermined thickness so that annealing is performed after cold rolling so that the stress applied to the strip is relieved by the rolling so that the next cold rolling continues And the workability in the rolling process is enhanced.

However, in the cold rolling process, since the strip adheres to the surface of the steel sheet with a rolling oil, a machine-operating oil, iron powder, dust, or other persistent contaminants, the strip is immediately put into the annealing process without removing it. The contaminants remain on the surface of the strip in the form of a carbide, causing corrosion on the surface of the strip, lowering the strength, damaging the aesthetics of the strip, and causing fatal defects such as discoloration of the surface. Therefore, the cold-rolled strips remove various contaminants adhering to the surface through the electrolytic clean line before being input to the annealing process.

On the other hand, when performing a mechanical cleaning operation through the brushing of the alkaline scrubber of such a cleaning line, the alkaline solution is sprayed between the steel plate and the brush roll through the nozzle. However, this injection amount of alkali is always constantly sprayed irrespective of the surrounding conditions, and the use of more alkaline liquid than necessary causes waste. In the rinse tank of the electrolytic clean line, the pure water is used to remove the residual rolling oil and the alkaline solution to ensure the cleanliness of the surface of the steel sheet. Therefore, there is a need to prevent environmental pollution by reducing the excessive use of the alkaline solution and by reducing the generation of bubbles.

Korean Patent Registration No. 10-0752316. 2007. 08. 29.

An object of the present invention is to secure the cleanliness of a steel sheet by connecting a scrubber of an electrolytic cleaner to spray a cleaning fluid toward a steel sheet.

Another object of the present invention is to prevent the abuse of the alkaline solution by spraying the pure water and the alkaline solution of the rinsing tank by controlling the flow rate of the alkaline solution.

Other objects of the present invention will become more apparent from the following detailed description and drawings.

According to one embodiment of the present invention, the steel sheet cleaning apparatus includes a scrubber installed on upper and lower portions of a steel sheet to be unidirectionally conveyed and scrubbing the steel sheet; A spray nozzle connected to the scrubber to supply a cleaning fluid to the steel plate; A cleaning fluid supply line connected to the injection nozzle for supplying a cleaning fluid to the injection nozzle; An alkaline solution supply line connected to an alkaline storage tank for containing an alkaline solution therein and supplying the alkaline solution to the cleaning fluid supply line; A rinsing tank for rinsing foreign matter remaining on the surface of the steel sheet passed through the scrubber using pure water; A pure water circulation line connected to the rinsing tank for supplying the pure water to the cleaning fluid supply line; An alkaline solution flow rate regulator provided on the alkaline solution supply line for regulating the flow rate of the alkaline solution supplied to the cleaning fluid supply line; A pure water flow rate regulator installed on the pure water circulation line for regulating a flow rate of the pure water supplied to the cleaning fluid supply line; And a controller connected to the alkaline liquid flow controller and the pure water flow controller to control the alkaline liquid and the pure water at a predetermined ratio.
The cleaner further comprises a cleanliness tester disposed in front of the scrubber with respect to the conveyance direction of the steel sheet and capable of detecting foreign substances on the surface of the steel sheet, wherein the controller controls the surface of the steel sheet The amount of the alkaline solution supplied to the cleaning fluid supply line may be increased by opening the alkaline liquid flow rate regulator.
According to an embodiment of the present invention, an electrolytic cleaning apparatus includes an alkaline cleaning tank for cleaning foreign matter adhered to a surface of a steel sheet conveyed in one direction by immersing the same in an alkaline solution; An electrolytic cleaning tank in which an electrode is embedded and an electric current is applied to the electrode to remove foreign substances on the surface of the steel plate passed through the alkaline cleaning tank; A rinsing tank for rinsing the foreign matter remaining on the steel plate passed through the electrolytic cleaning tank with pure water; A scrubber disposed in the alkaline cleaning tank and the electrolytic cleaning tank for scrubbing the upper and lower portions of the steel sheet, respectively; A spray nozzle connected to the scrubber to supply a cleaning fluid to the steel plate; A cleaning fluid supply line connected to the spray nozzle and supplying a cleaning fluid to the spray nozzle; An alkaline solution supply line connected to an alkaline storage tank for containing an alkaline solution therein and supplying the alkaline solution to the cleaning fluid supply line; A pure water circulation line connected to the rinsing tank for supplying the pure water to the cleaning fluid supply line; An alkaline solution flow rate regulator provided on the alkaline solution supply line for regulating the flow rate of the alkaline solution supplied to the cleaning fluid supply line; A pure water flow rate regulator installed on the pure water circulation line for regulating a flow rate of the pure water supplied to the cleaning fluid supply line; And a controller connected to the alkaline liquid flow controller and the pure water flow controller to control the alkaline liquid and the pure water at a predetermined ratio.
The electrolytic cleaning equipment further includes a cleanliness checker disposed in front of the scrubber in a direction of conveyance of the steel sheet to detect foreign matter on the surface of the steel sheet, If an abnormality of predetermined pollution degree is detected, the supply amount of the alkaline solution can be increased to the cleaning fluid supply line by opening the alkaline liquid flow rate regulator.

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According to one embodiment of the present invention, the cleaning fluid is sprayed toward the steel plate by being connected to the scrubber of the electrolytic cleaner to ensure the cleanliness of the steel plate. In addition, by regulating the recycling pure water and the alkaline liquid flow rate of the rinse tank, it is sprayed on the steel sheet, thereby preventing the abuse of the alkaline liquid, and it is possible to reduce the amount of alkaline liquid used. Reducing the amount of alkaline liquid and using recycled pure water, You can contribute.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic representation of a typical continuous galvanizing line
Fig. 2 is a view schematically showing the electrolytic cleaning equipment shown in Fig. 1. Fig.
3 is a schematic view of an electrolytic cleaning facility according to an embodiment of the present invention.
FIG. 4 is a view showing a connection state between the cleanliness tester shown in FIG. 3, the alkali flow rate controller, the pure water flow controller, and the controller.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4 attached hereto. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments are provided to explain the present invention to a person having ordinary skill in the art to which the present invention belongs. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer description.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic representation of a typical continuous galvanizing line; Generally, the continuous galvanizing process is carried out in an electrolytic cleaning facility (pre-treatment operation) 100 for cleaning a coiled steel sheet by winding a steel sheet S unwound from a pay rope reel. The steel sheet S that has passed through the electrolytic cleaner 100 is subjected to an annealing heat treatment in the annealing furnace 110 and is subjected to a post-treatment 120 for improving the function of the coated steel sheet S. The surface of the steel sheet S must be well cleaned in the electrolytic clean line 100 to prevent contamination of the high temperature annealing furnace 110 and the surface of the steel sheet S should be cleaned, And the life of the product can be prolonged. Especially, in the case of steel sheet S for automobile, it is an important factor for determining the quality of the plating product depending on the cleaning condition of the electrolytic cleaner 100.

Fig. 2 is a view schematically showing the electrolytic cleaning equipment shown in Fig. 1. Fig.

Generally, the steel sheet S is manufactured by rolling the steel sheet S to a predetermined thickness using a rolling mill. The manufactured steel sheet S is adhered with rolling oil or iron powder sprayed for the purpose of lubricating the rolls and the steel sheet S during rolling, The steel sheet (S) is rinsed after rolling to prevent the contamination of the equipment and damage the product value due to surface contamination present in the product.

For example, in a cold rolled product production line of a cold rolling mill of a steel mill, steel sheet (S) is subjected to pickling rolling and then subjected to a continuous hot-dip galvanizing line and a continuous annealing line in which continuous galvanizing is performed and an electric galvanizing line . In these processes, 100 to 200 mg / m < ² > of foreign matter such as rolling oil, hydraulic operating oil and iron powder adhered on the surface of the steel sheet in the course of pickling and cold rolling are adhered, Which adversely affects the adhesion of the plating and the resistance to corrosion in the process of plating and the like. Further, in order to increase the porosity, the steel sheet is cleaned using a high-temperature alkali solution (NaOH 1 to 5 wt%) before annealing. Such a cleaning process performs a combination of an alkaline cleaning and electrolytic cleaning process and a brush cleaning process in order to maximize the cleaning efficiency.

2, the electrolytic cleaning equipment 100 is slightly different depending on the characteristics of the cold-rolled line, but in the case of the alkaline cleaning in the primary cleaning step, it is immersed in the alkaline cleaning tank 10, Is sprayed on the surface of the steel sheet S to be cleaned. In the case of the electrolytic cleaning 30 as the secondary cleaning step, the steel sheet S is allowed to pass between the electrode apparatuses provided in the electrolytic cleaning tank containing the alkaline cleaning liquid having a high electrical conductivity, and the steel sheet S to be electrolytically cleaned, And a metal having a good durability in an alkali solution is used as another electrode. By applying a voltage, rolling oil and fine iron powder strongly adhered on the surface of the steel sheet S by electrolysis of water are electrically Method.

The steel sheet passed through the electrolytic cleaning tank 30 is passed through a rinsing tank 50 containing pure water to remove foreign matter remaining on the surface of the steel sheet S and then dried in a drying chamber 60 While the upper and lower surfaces of the steel sheet are scrubbed with a plurality of brushes between the alkaline cleaning tank 10 and the electrolytic cleaning tank 30 and between the electrolytic cleaning tank 30 and the rinsing tank 50 1 and the second scrubber 20, 40, respectively. The first scrubber 20 disposed between the alkaline cleaning tank 10 and the electrolytic cleaning tank 30 will be described as an example for convenience of explanation but it is arranged between the electrolytic cleaning tank 30 and the rinsing tank 50 The second scrubber 40 may have the same structure.

As described above, the alkaline cleaning tank 10, in which the alkali solution is filled so as to remove the foreign substances by the rolling flow adhering to the surface of the steel sheet S, is provided with a direction changing roll for guiding the conveying direction of the steel sheet S And a plurality of brush rolls 25 for mounting foreign matter on the inside of the first scrubber 20 are mounted on the surface of the steel plate S that has passed through the alkaline cleaning tank 10.

The first scrubber 20 rubs the steel sheet S while rotating the brush roll 25 in order to remove contaminants on the surface of the steel sheet S after passing through the alkali washing tank 10. In this case, an alkaline solution is sprayed to the upper or lower portion of the steel sheet S through the spray nozzle 23 to remove foreign substances such as rolling oil, which is called from the alkaline cleaning tank 10, by rotating the brush roll 25.

FIG. 3 is a view schematically showing an electrolytic cleaning apparatus according to an embodiment of the present invention. FIG. 4 is a view showing a connection state between the cleanliness checker, the alkaline flow controller, the pure water flow controller, and the controller shown in FIG. Hereinafter, the difference from the electrolytic cleaning equipment described above will be mainly described, but the omitted parts can be replaced with the contents described above. The rinsing tank 50 provided at the rear end of the electrolytic cleaner 100 has a function of rinsing components such as alkali and iron remaining on the surface of the steel sheet S, In the steel mill facilities, pure water is once again disposed of by disposing all of the used pure water. This is because not only the alkaline liquid is sprayed toward the existing first and second scrubbers 20 and 40 to abuse the alkaline liquid more than necessary and generate a lot of bubbles but also cause the environmental pollution do.

3 and 4, the electrolytic cleaning apparatus 100 of the present invention includes an alkaline solution supply line 70 for supplying an alkaline solution to the spray nozzle 23. As shown in Fig. The alkaline solution supply line 70 supplies the alkaline solution from the alkaline storage tank 78 toward the cleaning fluid supply line 72. An injection nozzle 23 is connected to one end of the cleaning fluid supply line 72 to supply a cleaning fluid mixed with an alkaline liquid and pure water to the injection nozzle 23. An alkaline liquid flow rate regulator 75 is provided on the alkaline liquid supply line 70 and the flow rate of the alkaline liquid supplied to the cleaning fluid supply line 72 through the alkaline liquid flow rate regulator 75 can be adjusted.

The electrolytic cleaning facility 100 also includes a pure water line 80 connected to the rinsing tank 50. The pure circulation line 80 supplies pure water received in the rinsing tank 50 toward the cleaning fluid supply line 72. A branch point 88 is formed at the point where the cleaning fluid supply line 72, the alkaline liquid supply line 70 and the pure water circulation line 80 meet. The alkaline liquid flow rate regulator 75 may be disposed under the branch point 88 and a pure flow rate regulator 85 may be provided on the pure water circulation line 80 in the same manner as the alkaline liquid supply line 70, The flow rate of the pure water to be supplied to the regenerator 72 can be adjusted.

The present invention prevents the abuse of the alkaline solution more than necessary by supplying the alkaline solution to the spray nozzle 25 provided in the first scrubber 20 from the existing alkaline storage tank 78 to degas the steel sheet, The water of the rinsing tank 50 provided at the rear end of the water tank 50 can be selectively used. Further, the ratio of the alkaline solution and the pure water can be adjusted through the alkaline solution and the pure flow controllers 75 and 85 according to the measurement result detected through the cleanliness tester 90 described later and supplied to the injection nozzle 23.

A cleanliness tester (90) is installed at the front end of the steel sheet (S) leading to the alkaline cleaning tank (10). The cleanliness tester 90 can detect foreign matters on the surface of the steel sheet, and can be, for example, an oil content sensor. When the steel sheet S having a degree of contamination equal to or less than predetermined is entered through the cleanliness tester 90, the recycled pure water supplied through the pure water circulation line 80 connected to the rinsing tank 50 is supplied to the spray nozzle 23 The use of the alkaline solution can be reduced by jetting toward the steel sheet S.

The cleanliness tester 90 can detect the degree of cleanliness of the steel sheet S after being passed through the rinsing tank 50 provided at the rear end of the rinsing tank 50. The cleanliness tester 90 passes through the cleanliness tester 90 installed at the rear end The ratio of the washing liquid supplied to the spray nozzle 23 can be changed by controlling the alkali flow rate regulator 75 and the pure water flow rate regulator 85 according to the degree of cleanliness of the steel plate S. Therefore, When the cleanliness of the steel sheet S is maintained after passing through the tank 10, pure water is supplied to the spray nozzle 23 through the pure water circulation line 80 connected to the rinsing tank 50, thereby reducing the use of the alkaline solution can do.

4, the cleanliness tester 90, the alkaline liquid flow regulator 75, and the pure water flow regulator 85 are connected to the controller 95, respectively. The controller 95 controls the alkaline liquid flow rate regulator 75 to increase the supply of the alkaline liquid to the spray nozzle 23 when the degree of pollution is exceeded through the cleanliness tester 90. On the other hand, when the degree of contamination measured through the cleanliness tester 90 is equal to or less than a preset level of contamination, the pure water flow controller 85 is adjusted to increase the supply amount of pure water.

Accordingly, the electrolytic cleaning apparatus 100 of the present invention can reduce the amount of alkali solution supplied to the spray nozzle 23 by a predetermined amount, reuse the pure water once used through the pure water circulation line 80, ) Is communicated with the alkaline liquid supply line (70), thereby reducing the amount of alkaline solution supplied to the spray nozzle (23) by a certain amount, thereby reducing environmental pollution. In addition, since the alkali solution can be selectively used, the use of a relatively expensive alkaline solution can be reduced, thereby contributing to productivity.

Although the present invention has been described in detail by way of examples, other forms of embodiments are possible. Therefore, the technical idea and scope of the claims set forth below are not limited to the embodiments.

10: alkali cleaning tank 20: first scrubber
23: injection nozzle 25: brush roll
30: electrolytic cleaning tank 40: second scrubber
50: Rinsing tank 60: Dryer
70: Alkaline liquid supply line 72: Oil supply line
75: alkaline liquid flow regulator 80: pure circulation line
85: pure flow regulator 88: branch point
90: cleanliness checker 95: controller
100: Electrolysis cleaning facility

Claims (6)

A scrubber installed on upper and lower portions of a steel plate to be unidirectionally conveyed to scrub the steel plate;
A spray nozzle connected to the scrubber to supply a cleaning fluid to the steel plate;
A cleaning fluid supply line connected to the injection nozzle for supplying a cleaning fluid to the injection nozzle;
An alkaline solution supply line connected to an alkaline storage tank for containing an alkaline solution therein and supplying the alkaline solution to the cleaning fluid supply line;
A rinsing tank for rinsing foreign matter remaining on the surface of the steel sheet passed through the scrubber using pure water;
A pure water circulation line connected to the rinsing tank for supplying the pure water to the cleaning fluid supply line;
An alkaline solution flow rate regulator provided on the alkaline solution supply line for regulating the flow rate of the alkaline solution supplied to the cleaning fluid supply line;
A pure water flow rate regulator installed on the pure water circulation line for regulating a flow rate of the pure water supplied to the cleaning fluid supply line;
A controller connected to the alkaline liquid flow rate controller and the pure water flow controller to control the alkaline liquid and the pure water of the purifying fluid at a predetermined ratio; And
And a cleanliness checker disposed in front of the scrubber to detect foreign matter on the surface of the steel sheet with reference to the conveying direction of the steel sheet,
The controller comprising:
When a predetermined degree of contamination is detected on the surface of the steel sheet through the cleanliness tester,
And the alkaline liquid flow rate regulator is opened to increase the supply amount of the alkaline liquid to the cleaning fluid supply line. delete delete delete An alkaline cleaning tank for immersing foreign matter adhering to the surface of a steel sheet conveyed in one direction in an alkali solution for cleaning;
An electrolytic cleaning tank in which an electrode is embedded and an electric current is applied to the electrode to remove foreign substances on the surface of the steel plate passed through the alkaline cleaning tank;
A rinsing tank for rinsing the foreign matter remaining on the steel plate passed through the electrolytic cleaning tank with pure water;
A scrubber disposed in the alkaline cleaning tank and the electrolytic cleaning tank for scrubbing the upper and lower portions of the steel sheet, respectively;
A spray nozzle connected to the scrubber to supply a cleaning fluid to the steel plate;
A cleaning fluid supply line connected to the spray nozzle and supplying a cleaning fluid to the spray nozzle;
An alkaline solution supply line connected to an alkaline storage tank for containing an alkaline solution therein and supplying the alkaline solution to the cleaning fluid supply line;
A pure water circulation line connected to the rinsing tank for supplying the pure water to the cleaning fluid supply line;
An alkaline solution flow rate regulator provided on the alkaline solution supply line for regulating the flow rate of the alkaline solution supplied to the cleaning fluid supply line;
A pure water flow rate regulator installed on the pure water circulation line for regulating a flow rate of the pure water supplied to the cleaning fluid supply line; And
A controller connected to the alkaline liquid flow rate controller and the pure water flow controller to control the alkaline liquid and the pure water of the purifying fluid at a predetermined ratio; And
And a cleanliness checker disposed in front of the scrubber to detect foreign matter on the surface of the steel sheet with reference to the conveying direction of the steel sheet,
The controller comprising:
When a predetermined degree of contamination is detected on the surface of the steel sheet through the cleanliness tester,
And the alkaline liquid flow rate controller is opened to increase the supply amount of the alkaline liquid to the cleaning fluid supply line.



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