KR20120073521A - Apparatus for cooling a strip and method using thereof - Google Patents

Abstract

PURPOSE: A slab cooling apparatus and a cooling method using the same are provided to increase cooling effect by removing retaining water remaining on the surface of slabs because cooling water is spread on entire surface of the slabs by pinch rolls. CONSTITUTION: A slab cooling apparatus(10) comprises first spraying units(20,30), second spraying units(40,50), and pinch rolls(60). The first and second spraying units are installed on a transferring path of a slab(S), and respectively spray cooling water(Wc) at the top and bottom surfaces of the heated slab. The pinch rolls, installed in the transferring path of the slab, uniformly spread the cooling water sprayed from the first or second spraying unit to the slab and correct the shape of the slab.

Description

Plate cooling device and plate cooling method using same {APPARATUS FOR COOLING A STRIP AND METHOD USING THEREOF}

The present invention relates to a sheet cooling apparatus and a sheet cooling method using the same, and more particularly, to a sheet cooling apparatus capable of adjusting the injection degree of the cooling water according to the state of the sheet and a sheet cooling method using the same.

The high temperature material (slab) manufactured by the continuous casting process and subjected to the heating furnace produces thick plates having a predetermined thickness through rolling steps such as rough rolling mill and finishing mill. do.

For example, as shown in Figure 1, for example, slabs (Slab) produced by the continuous casting process is heated to the target temperature according to the steel grade in the heating furnace (110). After passing through the furnace, the rolling material is subjected to a rolling step 120 such as a roughing mill (RM) and a finishing mill (FM), and then rolls the material to a predetermined thickness, for example, to the thickness of the final product. Produces plate (S).

Next, as illustrated in FIG. 1, the thick plate material S primarily rolled to a predetermined plate thickness through a roughness rolling mill passes through an accelerated cooler 130 for grain refinement or control of transformation structure.

Then, in order to increase the quality of the rolled product (thick plate product) through a leveling step through the leveler, and finally to the cooling table 150 is finished as a final product.

However, in the case where the thick plate product is not normally produced (rolled), as the demand level of the current consumer is stricter day by day, although not shown in a separate drawing, heat treatment or leveling work (plate calibration work) is performed again through a plate deformation measuring system. Finally, the product for which the plate deformation is compensated for, for example, a heavy plate product is shipped.

Therefore, when the cooling is completed, the material, that is, the non-corrective sheet material should be produced without the need for the post-treatment process after the rolling is completed, which affects the product productivity or the unit cost.

In other words, if the produced plate is deformed, it must undergo a separate calibration work, in which case the production cost is increased, as well as the customer delivery rate decreases due to the weight of the logistics load.

Thus, conventionally, in order to cool the thick plate, a laminar jet method, a multi jet method, and a slit slit jet method have been used. However, in the case of the melt-jet cooling method or the slant slit jet cooling method, there is a small variable range of cooling capacity according to the flow rate, and thus there is a problem in that it is difficult to obtain a desired cooling effect when a material or weak cooling is required.

Accordingly, an object of the present invention is to provide a plate cooling apparatus and a plate cooling method using the same, which can be adjusted to solve the problems as described above, which can adjust the injection degree of the cooling water according to the state of the plate.

Plate cooling apparatus according to an embodiment of the present invention includes a first spraying portion provided on the conveying path of the sheet so that the cooling water is sprayed to the upper and lower surfaces of the heated sheet; A second spraying part provided on a conveying path of the sheet material so that the cooling water is sprayed onto the upper and lower surfaces of the heated sheet material; And a pinch roll provided in the conveyance path of the sheet material so that the coolant injected from the first or second jetting portion is uniformly distributed in the sheet material and provided to correct the shape of the sheet material.

In one embodiment of the present invention, it is preferred that the first and second spraying portions are operated to spray cooling water to the heated sheet, separately or simultaneously, depending on the state of the heated sheet.

In one embodiment of the present invention, it is preferable that the first injection unit is composed of a plurality of unit headers provided to jet a large amount of cooling water in a jet injection method.

In one embodiment of the present invention, it is preferable that the second injection portion has a spray type injection structure such that a small amount of cooling water is injected in the form of mist.

Plate cooling method according to an embodiment of the present invention, when the strong cooling needs to be applied to the plate passing through the transfer path, the first injection unit is operated to spray the coolant to the plate (S1); When it is necessary to apply a weak cooling to the plate passing through the transfer path, the second injection unit is operated to spray the coolant to the plate (S2); When it is necessary to apply super cooling to the plate passing through the conveyance path, the step of operating the first and second injection unit at the same time (S3); And in at least one of the steps S1 to S3, it is preferable to include a step (S4) in which the pinch roll is operated to uniformly distribute the cooling water along the width direction of the plate.

In addition, the plate cooling method according to an embodiment of the present invention further includes a step (S5) of operating the second injection unit to remove the residual water formed by cooling the plate after the step S4 and the remaining coolant stays on the plate. It is preferable.

The present invention can adjust the degree of injection of the cooling water in accordance with the state of the plate material, it is possible to effectively cool the plate material.

In addition, the present invention can improve the cooling effect by using the pinch roll to remove the remaining water remaining on the surface of the plate while allowing the cooling water to be distributed throughout the plate surface.

1 is a schematic process chart showing a production (rolling) process of a thick plate product.
Figure 2 schematically shows the configuration of the plate cooling apparatus according to an embodiment of the present invention.
Figure 3 schematically shows a flow chart for a plate cooling method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the plate cooling apparatus and the plate cooling method using the same according to an embodiment of the present invention.

As shown in FIG. 2, the plate cooling apparatus 10 according to the exemplary embodiment of the present invention includes a first spray unit 20 and 30, a second spray unit 40 and 50, and a pinch roll 60. do.

Here, the pinch rolls 60 are positioned between the transfer rolls 11, and finely pressurizes the plate S so that the cooling water W _C sprayed from the first and / or second injection units is the plate S. In addition to being uniformly distributed in the width direction of), the cooling water W _C (hereinafter referred to as the remaining water W _R ) retained on the plate S is removed from the plate S.

In one embodiment of the present invention, the first spraying portion 20, 30 and the second spraying portion 40, 50 are members provided for spraying the cooling water (W _C ) to the plate (S).

However, in one embodiment of the present invention, for convenience of description, the first injection unit for injecting the cooling water (W _C ) to the upper surface of the plate (S) is referred to as the first upper injection portion 20, the plate (S) The first injection portion for injecting the cooling water (W _C ) to the lower surface of the) will be referred to as a first lower portion 30.

In one embodiment of the present invention, the first upper injection portion 20 is spaced apart from the upper surface of the upper plate S to the upper portion is installed on the transport path of the plate (S). The first upper injection unit 20 supplies the coolant W _C to the unit header 21 and the unit header 21 provided with a plurality of nozzles (not shown) capable of spraying the coolant W _C. It consists of a first cooling water supply pipe (22).

Here, approximately 1000 or more nozzles provided in the unit header 21 will be used, in which case the plurality of nozzles are arranged to be aligned in rows spaced apart from each other at predetermined intervals. The plurality of unit headers 21 constituting the first upper injection part 20 are arranged in a row spaced apart from each other at predetermined intervals along the transport path direction of the plate S.

When the first upper injection part 20 is operated, a large amount of cooling water W _C is injected from the plurality of unit headers 21 to the upper surface of the plate material S in a jet injection method.

On the other hand, in one embodiment of the present invention, the first lower portion 30 is spaced downward from the lower surface of the plate (S), is installed on the transport path of the plate (S). Here, since the first lower part injection part 30 has the same components and operation methods as the first upper part injection part 20, in an embodiment of the present invention, a detailed description of the first lower part injection part 30 will be given. It will be omitted.

Next, in one embodiment of the present invention, the second jetting part is installed on the transport path at a position adjacent to the first jetting part, and together with or separately from the first jetting part, the cooling water W _C is used as the sheet S. It is a member provided to cool the board | plate material S by spraying.

However, in one embodiment of the present invention, for convenience of description, the second injection portion for injecting the cooling water (W _C ) to the upper surface of the plate (S) is referred to as a second upper injection portion 40, the plate (S) The second injection portion for injecting the cooling water (W _C ) to the lower surface of the) will be referred to as a second lower portion 50.

In one embodiment of the present invention, the second upper injection portion 40 has a spray-type spray structure, it is possible to spray the cooling water (W _C ) to the upper surface of the plate (S) in the form of a mist. In addition, similar to the second upper injection part 40, the second lower part injection part 50 also has a spray-type spraying structure, and the cooling water W _C may be sprayed to the lower surface of the plate S in the form of a mist. .

Hereinafter, with reference to FIG. 3, a plate cooling method according to an embodiment of the present invention will be described.

First, the plate (S) rolled out of the heating furnace through the rolling roll is moved along the feed roll (11), and cooled while passing through the plate cooling apparatus (10).

At this time, according to the temperature of the plate S passing through the plate cooling apparatus 10, the first injection unit and / or the second injection unit is selectively operated.

For example, when it is determined that strong cooling needs to be applied to the plate S passing through the transport path, as in step S1, the first upper injection part 20 and the first lower part injection part 30 are operated to provide a large amount of the cooling. The cooling water W _C may be injected onto the surface of the plate S in a jet spraying manner to cool the plate S.

Simultaneously with the above process, the plate S passing through the plate cooling apparatus 10 is pressurized to a micro pressure by the pinch rolls 60, in which the pinch rolls 60 are the coolant sprayed onto the surface of the plate S. (W _C ) to be evenly distributed in the width direction of the plate (S).

For this reason, the plate cooling apparatus 10 according to the embodiment of the present invention allows the cooling water W _C to be uniformly distributed throughout the plate S, thereby reducing the shape of the plate S ( S) can be cooled.

On the other hand, as in step S2, when it is determined that weak cooling needs to be applied to the plate S passing through the transfer path, the first upper injection part 20 and the first lower part injection part 30 are not operated. The second upper injection part 40 and the second lower part injection part 50 for spraying the cooling water W _{C in the} spray type may be operated to cool the plate S.

At this time, the second upper injection unit 40 sprays a small amount of cooling water (W _C ) to the upper surface of the plate (S) rather than the flow rate of the cooling water sprayed by the first upper injection unit 20 in the spray type. Then, the second lower part sand 50 will spray a small amount of cooling water W _C to the lower surface of the plate S rather than the flow rate of the cooling water sprayed by the first lower part sand 30.

In addition, the pinch roll 60 is also operated while the second upper injection part 40 and the second lower part injection part 50 are operated, so that the cooling water W _C is uniformly distributed throughout the plate S. To help.

And, as in step S3, when it is determined that the plate S passing through the conveying path needs to be supercooled very strongly, the first upper injection part 20, the first lower part injection part 30, the second The upper injection section 40 and the second lower injection section 50 are operated simultaneously.

Even when the first upper injection part 20, the first lower injection part 30, the second upper injection part 40, and the second lower injection part 50 are all operated, the pinch roll 60 is operated. Thus, the cooling water W _C can be uniformly distributed throughout the sheet material S.

And finally, in order to remove the residual water W _R remaining on the plate S, the second upper injection part 40 and the second lower part injection part 50 are operated. In this case, the second upper injection part 40 and the second lower part injection part 50 may be operated together with the pinch roll 60 to remove the residual water W _R remaining on the surface of the plate S. On the other hand, through the above process, the residual water (W _R ) removed from the plate (S) is introduced into the second injection portion (45, 50) can be reused as the cooling water (W _C ).

In the sheet cooling method according to an embodiment of the present invention, according to the state of the plate (S), the degree of injection of the cooling water (W _C ) is determined (for example, cold, weak, or super cold), the cooling water to the plate (S) By injecting (W _C ), the board member S can be cooled efficiently. In addition, it does not waste the cooling water (W _C ) required for cooling, it is possible to reduce the production cost of the plate (S).

The illustrative embodiments described above are intended to be illustrative within all aspects of the invention rather than limiting. Accordingly, the present invention is capable of many modifications and detailed implementations which may be obtained from those contained within the specification by those skilled in the art. All such modifications and variations are considered to be within the scope and spirit of the invention as defined by the following claims.

10: plate cooling device 20: first upper injection part
30: first lower part injection part 40: second upper part injection part
50: second lower part sand 60: pinch roll

Claims (6)

A first spraying part provided on a conveying path of the sheet material such that the cooling water is sprayed onto upper and lower surfaces of the heated sheet material;
A second spraying portion provided on a conveying path of the sheet so that cooling water is sprayed onto upper and lower surfaces of the heated sheet; And
A pinch roll provided in the conveying path of the plate to provide the cooling water sprayed from the first or second spray unit to be uniformly distributed on the plate, and to correct the shape of the plate;
Plate cooling apparatus comprising a.
The method of claim 1,
And said first spraying portion and said second spraying portion are operated to spray coolant separately or simultaneously to said heated sheet in the state of said heated sheet.
The method of claim 1,
And said first injection unit comprises a plurality of unit headers provided for jetting a large amount of cooling water in a jet injection method.
The method of claim 1,
And said second spraying unit has a spray type spraying structure such that a small amount of cooling water is sprayed into a mist form.
In the sheet cooling method of cooling a sheet using the sheet cooling device of claim 1,
When it is necessary to apply strong cooling to the plate passing through the transfer path, the first injection unit is operated to spray coolant to the plate (S1);
When it is necessary to apply weak cooling to the plate passing through the transfer path, the second injection unit is operated to spray coolant to the plate (S2);
When it is necessary to apply super cooling to the plate passing through the transfer path, the step of operating the first and second injection unit at the same time (S3); And
In at least one of the steps S1 to S3, the pinch roll is operated to distribute the cooling water uniformly along the width direction of the plate (S4);
Plate cooling method comprising a.
The method of claim 5, wherein
After the step S4, the plate cooling method further comprises the step (S5) of operating the second injection unit to remove the remaining water formed by remaining the cooling water remaining on the plate after cooling the plate.

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