JPH0641905U - Slit laminar cooling device - Google Patents

Abstract

(57) [Summary] [Purpose] Achieve easy disassembly and cleaning and a short time. [Structure] A cooling water header 12 having a suction valve 15 attached to the top thereof is arranged in an outer box 11 having a water supply port 14, and a lower end of a slit nozzle 13 having a rectangular cross section is projected downward. In this state, the upper end is inserted from the bottom of the outer box 11 in parallel with the header 12, and the slit nozzle 13
A slit laminar cooling device for a hot steel sheet, which is fixed to the bottom portion such that the sum of the cross-sectional area of the upper end and the gap area between the upper end of the side wall of the slit nozzle 13 and the inner wall of the header 12 becomes equal, 11 main body 11a and canopy 11b
It is divided into two parts. The header 12 is integrally fixed to the canopy 11b. The header 12 and the slit nozzle 13 are not joined to each other, and gaps with substantially equal intervals are formed in the insertion portion of the slit nozzle 13 into the header 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a slit laminar cooling device used for cooling after rolling a hot-rolled steel sheet.

[0002]

[Prior art]

 Currently, as a cooling device for hot-rolled steel sheets, the application ratio of slit laminar cooling devices, which are superior in terms of uniform cooling in the width direction and overall cooling performance, is increasing year by year. However, since this slit laminar cooling device has a problem of poor water tightness, the applicant of the present application has proposed Japanese Patent Application No. 3-42602 as a slit laminar cooling device for solving this problem.

In the slit laminar cooling device previously proposed by the applicant, as shown in FIG. 7, the upper end of the slit nozzle 1 having a rectangular cross section is inserted in parallel with the header 2 from the bottom, and the “slit nozzle 1 upper end And the “total area of the gap between the upper end of the side wall of the slit nozzle 1 and the inner wall of the header 2” are equal to each other, and the slit nozzle 1 insertion position at the bottom of the header 2 is A plurality of cooling water inlets 3 are formed on both sides, and a cooling water header 2 having a suction valve 4 attached to the top of the slit nozzle 1 is attached to an outer box 6 having a water supply port 5 to remove the lower end of the slit nozzle 1 from the outside. It is enclosed in the state of being put out.

In such a slit laminar cooling device, “the cross-sectional area of the slit at the upper end of the inserted slit nozzle” and “the gap surface area between the upper end of the side wall of the slit nozzle and the inner wall of the header (the distance between the upper end of the slit nozzle and the inner wall of the header is The water tightness of the slit nozzle is very good, and since the suction valve is attached to the top of the header, the water tightness is In addition to being perfect, the responsiveness during ON / OFF can be dramatically improved, and the problems with the conventional slit laminar cooling device can be solved.

By the way, in the cooling device as described above, as a practical problem, there is an internal contamination due to a suspended substance in the cooling water. Normally, the cooling water used in the cooling device in the hot-run runout table is collected again after cooling the hot-rolled steel sheet and filtered by a filter, or the supernatant is taken out in a sedimentation tank. After suspending suspended matter in water to 10 to several tens of ppm or less, it is supplied again to the cooling device.

Therefore, as a result of long-term use (several months or more), the suspended suspended substance 7 is gradually adhered and deposited on each part of the inner wall of the slit laminar as shown by the diagonal lines in FIG. The inside or the like of the part is wholly or partially closed. In such a case, especially in the slit laminar cooling device, if the water film is cut off by the adhered deposits on each part of the inner wall, the steel plate will become unevenly cooled and the quality will be abnormal. It is necessary to clean the inside and the nozzle part every time.

[0007]

[Problems to be solved by the device]

 However, not only the conventional slit laminar cooling device, but also the slit laminar cooling device proposed by the applicant of the present invention, it is impossible to disassemble and open the inside or the nozzle part, and it takes a long time to clean it. What was needed was the reality.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a slit laminar cooling device in which the interior and nozzle portions can be easily disassembled and cleaned in a short time. There is.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the slit laminar cooling device of the present invention has a cooling water header having a suction valve attached to the top of an outer box having a water supply port and a rectangular cross section. With the lower end of the slit nozzle protruding downward, insert the upper end of the slit nozzle parallel to the header from the bottom of the outer box to determine the cross-sectional area of the slit nozzle upper end and the gap between the slit nozzle side wall upper end and the header inner wall. It is a slit laminar cooling device for hot steel plates that is fixed to the bottom so that the total area becomes equal, and the outer box is divided into a main body and a canopy, and the header is attached to the header. The header and the slit nozzle are not joined together, and the slit nozzle is inserted into the header at substantially equal intervals.

[0010]

[Action]

 In the slit laminar cooling device of the present invention, the header is integrally fixed to the canopy, and the slit nozzle fixed to the header and the main body are not joined, so when cleaning the inside or the nozzle part, If the canopy is removed from the main body, it will be separated into the canopy / header part and the main body / slit nozzle part, so that the inside of the main body / header / slit nozzle can be easily and easily cleaned.

Hereinafter, the slit laminar cooling device of the present invention will be described based on the embodiments shown in FIGS. 1 to 6. FIG. 1 is an explanatory view showing a cross section of one embodiment of a slit laminar cooling device of the present invention, FIG. 2 is a detailed view of a mounting portion of a main body and a canopy of the slit laminar cooling device of the present invention, and FIGS. It is an Example figure of the AA arrow view of Drawing 1.

In FIG. 1, reference numeral 11 denotes an outer box composed of a main body 11a and a canopy 11b, of which a header 12 for cooling water having a cylindrical shape, for example, is integrally fixed to the canopy 11b. A slit nozzle 13 having a rectangular cross section is integrally fixed to the bottom of the main body 11a with the lower end protruding downward and the upper end protruding upward. Further, cooling water supply ports 14 are provided on, for example, both side walls of the main body 11a.

By the way, below the header 12, a cooling water inflow hole 12a having a required shape is formed in the longitudinal direction, and when the canopy 11b is integrally fastened to the main body 11a, for example, by bolting, the upper end of the slit nozzle 13 is The portion is adapted to be inserted into the header 12 through the cooling water inflow hole 12a. The total area of the gap defined by the upper end of the side wall of the slit nozzle 13 inserted into the header 12 and the upper inner wall of the header 12 is substantially equal to the cross-sectional area of the upper end of the slit nozzle 13. Has been adjusted.

In addition, the insertion portion of the slit nozzle 13 into the header 12 is not joined, and the clearance between the cooling water inflow hole 12a and the outer peripheral surface of the slit nozzle 13 is substantially equal in the longitudinal direction of the header 12. Has been made. The shape of the gap may be a rectangular shape as shown in FIG. 3, a triangular shape as shown in FIG. 4, or a wide slit-like shape as shown in FIG. Alternatively, a narrow hole as shown in FIG. 6 may be provided with a perforation on the side.

Reference numeral 15 in FIG. 1 is a suction valve attached to the top of the header 12. When the valve is ON, the internal pressure of the header is usually negative, but when it is OFF, the suction valve 15 is opened at the same time when the header is turned OFF so that the internal pressure of the header 12 becomes atmospheric pressure. Further, 16 is a packing interposed between the main body 11a and the canopy 11b, and is a packing for ensuring the airtightness of the outer box 11 when tightening the bolt, and 17 is an air vent valve.

The slit laminar cooling device of the present invention is configured as described above. First, when the ON operation is performed, the suction valve 15 is closed and then the cooling water is supplied from the water supply port 14 into the outer box 11. It At this time, the air in the outer box 11 is discharged to the outside by operating the air vent valve 17 as needed.

When the volume of the cooling water supplied to the outer box 11 increases, the cooling water is uniformly and smoothly discharged from the gap between the cooling water inflow hole 12 a of the header 12 and the outer peripheral surface of the slit nozzle 13. It flows in and is rectified, and fills the inside of the header 12 evenly over its entire width. Then, the filled cooling water flows into the slit nozzle 13 through the upper end opening.

At this time, since the upper end of the slit nozzle 13 having a rectangular cross section is inserted in parallel with the upper inner wall of the header 12 in parallel with the header 12, the cooling water increases as the water surface rises in the header 12. Since it overflows into the slit nozzle 13 from both sides over the entire width of the slit nozzle 13, the slit nozzle 13 has a uniform flow, and the water film flowing down from the lower end is a very good film. Becomes

Next, at the time of OFF, when the 0FF operation is performed and the supply of the cooling water from the water supply port 14 is stopped and the suction valve 15 is opened, the internal pressure of the header 12, which was a negative pressure at the time of ON, becomes atmospheric pressure. Since the siphon effect is cut off, the cooling water located in the slit nozzle 13 is instantly sucked and removed. Therefore, the drop does not drop from the lower end of the slit nozzle 13 and the water tightness is perfect.

When disassembling and cleaning the slit laminar cooling device of the present invention, loosen the bolt and disassemble the outer box 11 into the canopy 11b / header 12 part and the main body 11a / slit nozzle 13 part online. The inside of 11a, the slit nozzle 13, and the header 12 can be cleaned easily and in a short time.

[0021]

[Effect of device]

 As described above, the slit laminar cooling device of the present invention can be easily disassembled and cleaned in a short time in addition to the effect of the slit laminar cooling device proposed by the present applicant in Japanese Patent Application No. 3-42602. Further, due to such an effect, it is possible to perform online cleaning instead of the offline cleaning of the conventional device, so that a spare part of the device becomes unnecessary.

[Brief description of drawings]

FIG. 1 shows a slit laminar cooling device 1 according to the present invention.
It is explanatory drawing which shows an Example cross section.

FIG. 2 is a detailed view of a mounting portion between the main body and the canopy of the slit laminar cooling device of the present invention.

3 is a diagram of a first embodiment of a view taken along the line AA of FIG.

FIG. 4 is a diagram of a second embodiment of a view taken along the line AA of FIG.

FIG. 5 is a diagram of a third embodiment taken along the line AA of FIG.

FIG. 6 is a diagram of a fourth embodiment taken along the line AA of FIG.

FIG. 7 is an explanatory diagram of a slit laminar cooling device proposed by the present applicant in Japanese Patent Application No. 3-42602.

[Explanation of symbols]

 11 Outer box 11a Main body 11b Canopy 12 Header 12a Cooling water inflow hole 13 Slit nozzle 14 Water supply port 15 Suction valve

Claims (1)

[Scope of utility model registration request] 1. A state in which a cooling water header having a suction valve attached to the top thereof is disposed in an outer box having a water supply port, and a lower end of a slit nozzle having a rectangular cross section is projected downward. , The upper end is inserted parallel to the header from the bottom of the outer box, and fixed to the bottom so that the cross-sectional area of the slit nozzle upper end and the total clearance area between the slit nozzle side wall upper end and the header inner wall are equal. A slit laminar cooling device for a hot steel sheet, which is formed by dividing the outer box into a main body and a canopy, integrally fixing the header to the canopy, and the header and the slit nozzle are not A slit laminar cooling device characterized in that gaps are formed at substantially equal intervals by joining and at the insertion portion of the slit nozzle into the header.