JP2003183740A - Replacement structure of header pipe for cooling water supply of spray cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a replacement structure of a header pipe for cooling water supply of a spray cooling device in which a header pipe for cooling water supply can be easily removed and attached. SOLUTION: In a replacement structure of a header pipe for cooling water supply of a spray cooling device for cooling a steel strip, a mounting flange for holding the header pipe in a casing is provided at one end of the header pipe, and the other end of the header pipe is provided. Is provided with a header fixing member protruding from the header pipe diameter, while the casing is provided with an opening for taking the header pipe in and out of the casing, a flange for mounting the header pipe, and a guide bar for guiding the header pipe in the casing. Further, a box-shaped body for receiving the other end of the header pipe is installed in the casing, and the header pipe is rotated around the axis of the box in the box-shaped body, thereby locking the header pipe to the inner surface of the box-shaped body. Then, the header pipe was fixed in the casing.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip cooling device, a continuous plating facility, or a continuous coating facility in a continuous heat treatment facility for continuously heat treating a steel strip. The present invention relates to a replacement structure of a header pipe for supplying cooling water of a spray cooling device for cooling a steel strip in the above-mentioned manner. 2. Description of the Related Art Conventionally, in a cooling apparatus for a steel strip after plating in, for example, a galvanizing facility, a gas-liquid mixed type spray cooling apparatus for mixing and spraying cooling water with a cooling gas has been used. . The gas-liquid mixed type spray cooling device has a higher cooling capacity than the case where only gas is injected to cool the steel strip after plating. Therefore, the top roll at the top of the cooling tower that cools the steel strip after plating is used. When cooling the strip at a temperature sufficient to prevent product failure caused by the deposition of the plated zinc on the top roll surface (typically 350 ° C. or less), a cooling device is used. It has the advantage of being compact and therefore has the advantage that the height of the cooling tower can be reduced. In such a steel strip spray cooling device, a large number of cooling nozzles for spraying cooling water are arranged facing the steel strip, and the cooling nozzles are provided on a spray header connected to a cooling water supply pipe. . The spray headers are arranged in multiple stages with a steel strip interposed. FIG. 3 is a diagram showing the overall configuration of a conventional cooling device. In a casing 9 of the cooling device A, a plurality of gas cooling nozzles 10 and a plurality of liquid cooling nozzles 11 are arranged opposite to each other with a steel strip 20 interposed therebetween. Gas cooling nozzle 10
Are arranged in a large number in the gas cooling box 22, and a cooling gas is supplied from outside through a gas supply duct (not shown). In addition, the liquid cooling nozzle 1
1 is supplied with a cooling liquid via a cooling water pipe 12. Further, in the middle of the cooling water pipe 12, a flow control valve 1 is provided.
3 is provided, the flow rate of the cooling water can be adjusted, the cooling water can be stopped for each block and used as gas cooling, and the cooling capacity can be widely adjusted. ing. The exhaust air from the cooling device A is supplied to the lower exhaust hole 18.
And it is discharged | emitted out of a system from an upper exhaust hole 19 by a duct. Also, the falling water after spraying is collected and drained in the lower drain hole 14 and the middle drain hole 15 provided at the lower part of each stage. A lower draining nozzle 17 is provided at the lowermost part of the cooling device A, and has a structure capable of preventing the sprayed cooling water from falling along the steel strip 20. Reference numeral 16 denotes a masking shutter that masks the spraying of the refrigerant onto the steel strip 20. FIG. 4 is a diagram showing details of a gas cooling nozzle and a liquid cooling nozzle in the conventional cooling device A. FIG. 5 is a diagram showing a cross-sectional structure of the gas cooling nozzle, the gas cooling box, and the liquid cooling nozzle in FIG. The gas cooling nozzles 10 are installed in a plurality of stages in the gas cooling box 22, and the cooling water supply header pipes 1 are arranged between the gas cooling nozzles 10 installed in the plurality of stages. The header pipe 1 is provided with a plurality of liquid cooling nozzles 11 pointing upward. Water is sprayed from the liquid cooling nozzle 11 to the gas ejected from the gas cooling nozzle 10 toward the steel strip 20 to mix the gas and water with the steel strip 20.
It is configured to cool down. FIG. 6 is a structural view showing a method of fixing a cooling water supply header pipe according to a conventional method. This figure 6
As shown in the figure, the cooling water supply header pipe 1 is supported on supports 8 attached to a plurality of locations of the gas cooling box 22, and is fixedly fastened at two or more locations in the width direction of the steel strip by U-shaped bolts 21. ing. [0007] As described above, the cooling water injected from the cooling water nozzle collides with the steel strip to cool the steel strip, and then the lower drain hole and the middle part in the cooling device. The water is discharged from the drain holes, passed through a separately provided cooling tower, etc., adjusted for water temperature, and then reused to form a closed loop of a cooling water circulation system. At this time, minute zinc powder from the zinc layer on the steel strip surface may be mixed into the cooling water drainage after the collision with the steel strip. In addition, the temperature of the cooling water used in the closed loop is determined in consideration of the efficiency of the entire cooling system.
Usually, the temperature is set in the range of 30 to 50 ° C., so that the calcium content in the cooling water tends to be easily deposited on the nozzle portion and the like. [0008] The above zinc powder and calcium often adhere to the inside of the nozzle and block the nozzle. The nozzle clogging not only impedes the cooling water jetting and lowers the cooling capacity, but also causes a variation in cooling capacity due to the difference in the degree of nozzle clogging in each of the plurality of nozzles arranged in the width direction of the steel strip. Occurs, and the uniform cooling of the steel strip is impaired, and in the worst case, a shape defect may occur due to uneven cooling of the steel strip. Therefore, the cooling nozzle is cleaned and maintained, and it is essential to maintain the cooling effect by periodically removing the blocked portion of the nozzle due to zinc powder and calcium to ensure a stable supply of cooling water. Was. [0009] However, if the maintenance work of the nozzle is performed in a state where the nozzle is mounted inside the cooling device, it is extremely difficult due to the problem of the work space and the work environment. That is, in order to remove the blockage of the nozzle portion, the worker enters the cooling device and performs a maintenance work.Therefore, it is necessary to provide a sufficient space in the cooling device and a required number of manholes that allow the user to freely enter and exit the cooling device. There is a problem that the apparatus becomes large. Also,
The working environment of the nozzle maintenance work is poor, such as being performed in a high-temperature and high-humidity cooling device, and the cooling device of the vertical path such as the cooling device after plating is long in the height direction.
Each time, it is necessary to set up a temporary scaffold in the cooling device so that the worker can safely approach the large number of nozzle groups in each stage, and the structure of the cooling device becomes more complicated and larger. Is inevitable,
There has been a problem that assembling a temporary scaffold requires a great deal of time and effort. Also, when the nozzle cooling water header pipe is removed and once carried out of the cooling device and the nozzle is to be cleaned, the cooling water header pipe in the conventional structure has a U-shape as described above. Since it is fixed at several places by bolts, it is necessary for an operator to enter the casing in order to remove this fixing bolt, which has caused problems in the working space and working environment. If the height of the device is large, it is still necessary to assemble a necessary temporary scaffold, and the problem that a great deal of time and labor is required has not been solved. Therefore, according to the present invention, the header pipe for cooling water supply can be easily removed and attached so that the header pipe can be replaced in a short time, and the cooling water supply header pipe can be removed from the casing. By removing the header pipe and cleaning the nozzle, the work inside the cooling device as in the past is not required, and the header pipe of the spray cooling device that can make the cooling device compact can be replaced. Provides structure. SUMMARY OF THE INVENTION The gist of the present invention is to inject cooling water into a steel strip or mix cooling water and gas with a cooling water supply header pipe installed in a casing. In the replacement structure of the cooling water supply header pipe of the spray cooling device for spraying and cooling the steel strip, the cooling water supply header pipe is held at one end of the cooling water supply header pipe by the casing. And a header fixing member projecting beyond the header pipe diameter is provided at the other end of the cooling water supply header pipe, while the cooling water supply header pipe is provided inside and outside the casing on the casing. A guide bar for guiding the cooling water supply header pipe in an opening for taking in and out, a mounting flange thereof, and a casing. And a box for receiving the other end of the cooling water supply header pipe is provided in the casing, and the cooling water supply header pipe is rotated about the axis in the box. Thereby, the fixing member of the cooling water supply header pipe is locked to the inner surface of the box-shaped body, and the cooling water supply header pipe of the spray cooling device in which the cooling water supply header pipe is fixed in the casing. It is a replacement structure. FIG. 1 and FIG. 2 are views showing an embodiment of replacement of a header pipe for supplying cooling water according to the present invention.
As shown in FIG. 1, a header pipe 1 for supplying cooling water is provided.
1 (a) is an overall schematic view, and FIG. 1 (b) is a cross-sectional view taken along the line aa of FIG. 1 (a). 1 (c) is FIG. 1 (a)
FIG. 2 shows a state in which the cooling water supply header pipe 1 has been mounted in the casing 9 of the cooling device A. FIG. 2 (a) is an overall schematic diagram, and FIG. 2 (b) is a diagram. 2A is a sectional view taken along line aa of FIG.
(C) is a diagram showing an arrow c in FIG. 2 (a). The cooling devices A are installed opposite to each other with the steel strip interposed therebetween. On both sides of the steel strip, header pipes 1 for supplying cooling water as shown in FIG. Here, a one-stage cooling water supply header pipe will be described as an example. The cooling water supply header pipe 1 is provided with a number of liquid cooling nozzles 11 at regular intervals in the axial direction thereof. And header pipe 1 for cooling water supply
A header pipe side mounting flange 3 for holding the cooling water supply header pipe 1 in the casing 9 is installed at one end of the cooling water supply header pipe 1. Header pipe for water supply 1
Is provided with a header fixing member 6 which partially protrudes outside the diameter of the header. In FIG. 1, a casing-side mounting flange 2 is provided on one outer side of a casing 9 of the cooling device A installed across the width direction of the steel strip. The casing-side mounting flange 2 is provided with an opening 23 that is at least necessary for the cooling water supply header pipe 1 and the liquid cooling nozzle 11 to pass therethrough. In the casing 9 on the other side in the width direction, a box-shaped body 5 for receiving the cooling water supply header pipe 1 is fixedly installed. Further, in the casing 9, a guide bar 7 for guiding the cooling water supply header pipe 1 is provided between the casing side mounting flange 2 and the box-shaped body 5.
The guide bar 7 is supported via a support 8 fixed to a gas cooling box 22 (not shown). The connection of the cooling water pipe to the cooling water supply header pipe 1 is not shown, but a flexible hose is provided on the pipe side so that the connection with the cooling water connection flange 4 is easily performed. Next, a method of mounting the cooling water supply header pipe 1 will be described as an example. The cooling water supply header pipe 1 is inserted into the casing 9 through the opening 23 of the casing side mounting flange 2 installed on the casing side, and is inserted into the casing 9 along the guide bar 7 in the casing 9. It is inserted toward the provided box-shaped body 5. At this time, the casing side mounting flange 2
Cooling water supply header pipe 1 and liquid cooling nozzle 1
The cooling water supply header pipe 1 is provided with a nozzle 23 in a normal state during the insertion / removal process as shown in FIG. 1 (b). Insertion / removal is performed in a state where an angle is provided as compared with FIG. This is due to the fact that the gas-liquid mixed spray system operates during operation, as shown in FIG.
As shown in the figure, the liquid cooling nozzle 11 is
It is oriented vertically to mix with gas from zero. However, since the gas cooling nozzle 10 has a nozzle height variation of about 1 to 3 mm due to its manufacturing accuracy, the cooling water is set at an angle of the liquid cooling nozzle 11 as shown in FIG. If the supply header pipe 1 is inserted into or removed from the casing 9, the liquid cooling nozzle 11 and the gas cooling nozzle 10 may interfere with each other during the insertion and removal of the cooling water supply header pipe 1. Therefore, the liquid cooling nozzle 11 is angled as shown in FIG. 1 (b) so that the liquid cooling nozzles 11 are separated from each other so as not to interfere with each other, so that the cooling water supply header pipe 1 can be smoothly inserted into and removed from the casing 9. Consideration is given to make it possible. As shown in FIG. 2, the fixing member 6 is
After the cooling water supply header pipe 1 is rotated about the axis as shown in FIG. 2C, the fixing member 6 is locked to the inner surface of the box-shaped body 5, that is, as shown in FIG.
When the fixing member 6 and the box-shaped body 5 are fitted together and the liquid cooling nozzle 11 is returned to a normal angle during operation, the swing of the cooling water supply header pipe 1 in the direction perpendicular to the axis is restrained, and the cooling water supply header is formed. The pipe 1 can be fixed in the casing 9. Therefore, the fixing member 6 must be made to protrude beyond the diameter of the cooling water supply header pipe 1 so that the fixing member 6 can be locked on the inner surface of the box 5. Thereafter, the casing-side mounting flange 2 and the header pipe-side mounting flange 3 are fastened to completely fix the cooling water supply header pipe 1. As described above, when the cooling water supply header pipe 1 is inserted into the casing 9 and fixed in the manner shown in FIGS. 1 and 2, the operator performs all the series of operations outside the cooling device A. It is configured to be able to perform from. Here, the case where the cooling water supply header pipe 1 is inserted and attached to the casing 9 has been described.
When removing from the casing 9, the above procedure may be reversed. Further, the present invention can be similarly applied to a spray cooling device which only injects cooling water. As described above, according to the present invention, the operator does not need to enter the inside of the cooling device when performing the maintenance work of the liquid cooling nozzle group. Is advantageous in that it is not necessary to provide a work space for the above in advance, and the apparatus can be downsized. Also,
The nozzle maintenance work itself can be performed after the cooling water supply header pipe is once easily drawn out of the cooling device, so that it is possible to eliminate conventional problems such as a poor working environment. The advantage that the maintenance work can be performed while saving wasted time and labor of assembling a temporary scaffold each time can be enjoyed.
The cooling water supply header pipe has an excellent effect that the header pipe can be taken in and out along the guide bar in the casing, and the header pipe can be fixed securely and easily by the fixing member provided at the tip of the header pipe. Things.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing one embodiment of replacement of a cooling water supply header pipe according to the present invention. FIG. 2 is another embodiment of replacement of a cooling water supply header pipe according to the present invention. FIG. 3 is a diagram showing the overall configuration of a conventional cooling device. FIG. 4 is a diagram showing details of a gas cooling nozzle and a liquid cooling nozzle in the conventional cooling device. FIG. 5 is a gas cooling diagram in FIG. FIG. 6 is a view showing a cross-sectional structure of a nozzle, a gas cooling box, and a liquid cooling nozzle. [Description of Signs] 1 Header pipe for cooling water supply 2 Flange for mounting on casing side 3 Flange for mounting on header pipe side 4 Cooling water connection flange 5 Box-shaped body 6 Header fixing member 7 Guide bar 8 Support 9 Casing 10 Gas cooling nozzle 11 Liquid cooling nozzle 12 Cooling water pipe 13 Flow control valve 14 Lower drainage hole 15 Middle drainage hole 16 Masking shutter 17 Lower drainage nozzle 18 Lower exhaust hole 19 Upper exhaust hole 20 Steel strip 21 U-shaped bolt 22 Gas cooling box 23 Opening A Cooling device

Claims (1)

Claims 1. A cooling water supply header pipe installed in a casing injects cooling water to a steel strip or mixes and sprays cooling water and gas to cool the steel strip. In the replacement structure of the cooling water supply header pipe of the spray cooling device, a mounting flange for holding the cooling water supply header pipe to the casing is provided at one end of the cooling water supply header pipe, and the cooling water supply header pipe is provided. The other end of the water supply header pipe is provided with a header fixing member protruding from the header pipe diameter, while the casing has
An opening for taking the cooling water supply header pipe into and out of the casing, a flange for attaching the opening and a guide bar for guiding the cooling water supply header pipe in the casing are provided, and the cooling water supply header is further provided in the casing. A box for receiving the other end of the pipe is provided, and the cooling water supply header pipe is rotated about the axis of the box in the box, so that the cooling water supply header is provided on the inner surface of the box. Lock the fixing member of the pipe,
The cooling water supply header pipe replacement structure of a spray cooling device, wherein the cooling water supply header pipe is fixed in a casing.