Apparatus for cooling steel sheet

1. An apparatus for cooling a steel sheet, the apparatus comprising:

an apparatus body provided to be spaced apart from the steel sheet in a conveying path of the steel sheet; and

a cooling unit provided in the apparatus body to supply a cooling fluid,

wherein the apparatus body comprises:

a first edge body facing a first edge portion extending a predetermined distance from one side end in a width direction of the steel sheet to a center in the width direction of the steel sheet; and

a second edge body facing a second edge portion extending a predetermined distance from the other side end in the width direction of the steel sheet to the center in the width direction of the steel sheet,

wherein the apparatus body has a first inclination angle formed between an extension line of a symmetry point at which the first edge body and the second edge body intersect each other and the first and second edge bodies, and

wherein each of the first and second edge bodies comprises:

a first inclined section forming the first inclination angle together with the extension line and being a region inclined in a direction away from the steel sheet;

a non-inclined section, connected to the first inclined section, from which a shortest distance to the steel sheet in a thickness direction of the steel sheet is provided to be constant; and

a second inclined section connected to the non-inclined section and being a region inclined in a direction toward the steel sheet.

2. The apparatus of claim 1 , wherein in the apparatus body, an absolute value of the first inclination angle is 1° or more to 10° or less.

3. The apparatus of claim 2 , wherein the apparatus body further comprises:

a center body facing a center in a width direction of the steel sheet and present between the first edge body and the second edge body, and

wherein the center body is provided such that a shortest distance to the steel sheet in the thickness direction of the steel sheet is provided to be constant in the width direction the steel sheet.

4. An apparatus for cooling a steel sheet, the apparatus comprising:

an apparatus body provided to be spaced apart from the steel sheet in a conveying path of the steel sheet; and

a cooling unit provided in the apparatus body to supply a cooling fluid,

wherein the apparatus body comprises:

a first edge body facing a first edge portion extending a predetermined distance from one side end in a width direction of the steel sheet to a center in the width direction of the steel sheet; and

a second edge body facing a second edge portion extending a predetermined distance from the other side end in the width direction of the steel sheet to the center in the width direction of the steel sheet,

wherein each of the first and second edge bodies is provided such that a cross-section in a direction, perpendicular to a conveying direction of the steel sheet, is linearly inclined, and end portions of the first and second edge bodies are inclined in a direction away from the steel sheet to be present farthest from the steel sheet,

wherein the apparatus body has a first inclination angle formed between an extension line of a symmetry point at which the first edge body and the second edge body intersect each other and the first and second edge bodies, and

wherein each of the first and second edge bodies comprises:

a first inclined section forming the first inclination angle together with the extension line and being a region inclined in a direction away from the steel sheet;

a non-inclined section, connected to the first inclined section, from which a shortest distance to the steel sheet in a thickness direction of the steel sheet is provided to be constant; and

a second inclined section connected to the non-inclined section and being a region inclined in a direction toward the steel sheet.

5. The apparatus of claim 4 , wherein the first and second edge bodies are provided to form a second inclination angle in the second inclined section together with the extension line of the non-inclined section in the width direction of the steel sheet, and

wherein an absolute value of the second inclination angle is at least 3°.

6. The apparatus of claim 5 , wherein a length of the first inclined section in the width direction of the steel sheet is at least 900 mm,

a length of the non-inclined section in the width direction of the steel sheet is at least 50 mm, and

a length of the second inclined section in the width direction of the steel sheet is at least 50 mm.

7. The apparatus of claim 4 , wherein the apparatus body comprises:

at least one dimple region formed to be concave on a surface, facing the steel sheet, in a direction opposing the steel sheet.

8. The apparatus of claim 7 , wherein the first edge body and the second edge body extend outwardly of an external surface of the steel sheet in the width direction of the steel sheet.

9. The apparatus of claim 8 , wherein the first and second edge bodies are symmetrical with each other in the width direction of the steel sheet with respect to the symmetry point at which the first edge body and the second edge body intersect each other.

10. The apparatus of claim 9 , wherein a diameter of the dimple region is a value greater than 0 mm to 15 mm or less,

a depth of the dimple region is a value greater than 0 mm to 0.5 mm or less, and

a maximum pitch of the dimple region is 25 mm.

11. The apparatus of claim 10 , wherein the cooling unit comprises:

a plurality of cooling means spaced apart from each other in the conveying direction of the steel sheet in the apparatus body, and

wherein the cooling means comprises:

a plurality of cooling nozzles facing the steel sheet to supply a cooling fluid;

a slot accommodating the cooling nozzles therein; and

a supply means connected to the cooling nozzles to supply the cooling fluid at constant pressure.

12. The apparatus of claim 11 , wherein the cooling unit comprises a plurality of cooling means spaced apart from each other in the conveying direction of the steel sheet in the apparatus body,

wherein the cooling means comprises:

a plurality of cooling nozzles facing the steel sheet to supply a cooling fluid;

a slot accommodating the cooling nozzles therein; and

a supply means connected to the cooling nozzles to supply the cooling fluid at constant pressure, and

wherein the plurality of cooling nozzles are provided with a plurality of cooling nozzles in the width direction of the steel sheet in the apparatus body, and are provided in the apparatus body to supply the cooling fluid in a position closer to the steel sheet than an external surface of the apparatus body, and

wherein the plurality of cooling nozzles are spaced apart from the steel sheet at regular intervals in the thickness direction of the steel sheet.

13. An apparatus for cooling a steel sheet, the apparatus comprising:

an apparatus body provided to be spaced apart from the steel sheet in a conveying path of the steel sheet; and

a cooling unit provided in the apparatus body to supply a cooling fluid,

wherein the apparatus body comprises:

a first edge body facing a first edge portion extending a predetermined distance from one side end in a width direction of the steel sheet to a center in the width direction of the steel sheet; and

a second edge body facing a second edge portion extending a predetermined distance from the other side end in the width direction of the steel sheet to the center in the width direction of the steel sheet; and

a center body facing a center in a width direction of the steel sheet and present between the first edge body and the second edge body,

wherein the center body is provided such that a shortest distance to the steel sheet in a thickness direction of the steel sheet is provided to be constant in the width direction the steel sheet,

wherein each of the first edge body and the second edge body comprises:

a first inclined section facing the edge portion of the steel sheet and formed by providing an external surface of the first inclined section so as to be inclined in a direction away from a surface of the steel sheet;

a non-inclined section connected to the first inclined section and formed by providing an external surface of the non-inclined section so as not to be inclined; and

a second inclined section connected to the non-inclined section and formed by providing an external surface of the second inclined section so as to be inclined in a direction toward the surface of the steel sheet,

wherein a length of the non-inclined section in the width direction of the steel sheet is greater than 0 and is a value less than or equal to ⅕ of a total length of the center body in the width direction of the steel sheet, and

wherein the first and second inclined sections are provided to be linearly inclined.

14. The apparatus of claim 13 , wherein the apparatus body comprises:

a plurality of partition walls disposed to be spaced apart from each other in the width direction of the steel sheet inside the apparatus body, and

wherein a spacing distance between the plurality of partition walls is at least equal to a length of the center body in the width direction of the steel sheet.

15. The apparatus of claim 13 , wherein an absolute value of a third inclination angle, formed between an extension line of the center body and the first inclined section, is a value between 1° or more to 5° or less.

16. The apparatus of claim 13 , wherein a length of the second inclined section in the width direction of the steel sheet is greater than 0, and is a certain value within a range less than or equal to a length of the non-inclined section in the width direction of the steel sheet.

17. The apparatus of claim 16 , wherein an absolute value of a second inclination angle, formed between an extension line of the non-inclined section in the width direction of the steel sheet and the second inclined section, is greater than 0° and is a value less than or equal to an absolute value of an inclination angle of the first inclined section.

18. The apparatus of claim 17 , wherein the apparatus body comprises a plurality of dimple regions formed to be concave on a surface, facing the steel sheet, in a direction opposing the steel sheet, and

wherein the plurality of dimple regions are disposed in the width direction of the steel sheet.