JPS633703Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is a steel plate cooling method that enables uniform cooling of hot rolled steel plates by changing the water injection width according to the width of the hot rolled steel plates. Regarding equipment.

<Prior art> A high-temperature hot rolled steel plate (strip) passed through a finishing mill in a hot rolling facility is cooled to a predetermined temperature by cooling water while running on a runout table, and then transferred to a down coiler. It is designed to be rolled up. What is important when cooling this hot-rolled steel plate is how to control the temperature throughout the hot-rolled steel plate to the desired temperature, and this greatly affects the quality of the product. Ru.

As shown in FIG. 3, which shows the concept of a conventional steel plate cooling device, there are rollers arranged in a straight line along the width direction of the hot rolled steel plate 1 above and below the runout table roller 2 that guides the running of the hot rolled steel plate 1. A water injection header 4 is provided with a number of arranged water injection nozzles 3 protruding from the water injection header 4, and cooling water 5 is poured from these water injection nozzles 3 toward the hot rolled steel plate 1 in a rod-shaped laminar flow. As a result, the hot rolled steel plate 1 is cooled to a preset temperature. The injection width of the cooling water 5 is designed to match the maximum width of the hot-rolled steel plate 1 passing over the run-out table roller 2. In this case, the cooling water 5 from the water injection nozzles 3 located on both sides of the hot rolled steel plate 1 in the width direction does not participate in cooling the hot rolled steel plate 1.

<Problems to be solved by the invention> In general, when a hot-rolled steel plate passes through a finishing mill, both ends in the width direction are already cooled to a greater degree than the center. If the width of the hot-rolled steel plate is narrower than the water injection width in the steel plate cooling device, the cooling of both widthwise ends of the hot-rolled steel plate will be more accelerated than the center. As a result, the temperature distribution along the width direction of the hot-rolled steel plate becomes non-uniform, and distortion occurs in the hot-rolled steel plate, resulting in loss of flatness or non-uniform material quality.

In recent years, in addition to making the temperature distribution uniform in both the front and rear end directions of hot rolled steel sheets, attention has also been paid to the temperature distribution in the width direction. It is an object of the present invention to provide a steel plate cooling device that can uniformize the temperature distribution along the width direction of a rolled steel plate and obtain a homogeneous product without distortion.

<Means for Solving the Problems> The structure of the steel sheet cooling device according to the present invention is such that a number of laminar flow nozzles inject cooling water into each hot rolled steel sheet in a laminar flow in the width direction of the hot rolled steel sheet. In the linearly arranged steel plate cooling device, there is a fluid pressure cylinder attached to the laminar flow nozzle located on both sides in the width direction, a link mechanism provided at the lower tip of the fluid pressure cylinder, and opening/closing of the link mechanism. The present invention is characterized in that a lever is provided with a lid for opening and closing the tip of the laminar flow nozzle.

<Function> By controlling the outflow of cooling water from the laminar flow nozzles located at both widthwise ends of the hot-rolled steel plate by operating the fluid pressure cylinder as necessary, the water injection width is adjusted to the width of the hot-rolled steel plate. The following is true.

<Example> As shown in FIG. 1, which shows the appearance of an example of the steel plate cooling device according to the present invention, a pair of left and right frames 1
A header 15 into which cooling water 14 is fed from a water supply source (not shown) is arranged along the width direction of the hot-rolled steel plate 12 above the run-out table roller 13 that straddles the run-out table roller 13 and guides the running of the hot-rolled steel plate 12. A laminar flow nozzle (hereinafter referred to as a water injection nozzle) 16 that opens toward the runout table roller 13 side is provided on the header 15 and protrudes in a straight line along the width direction of the hot rolled steel plate 12. .

As shown in FIG. 2a showing the structure of the main part of this embodiment, and FIGS. The cooled water 14 is transferred to the hot rolled steel plate 12.
Among the U-shaped water injection nozzles 16 that pour water into the water, in this embodiment, eight water injection nozzles 16 on the left and right sides are located at both ends in the width direction of the hot rolled steel plate 12.
Two water injection nozzles 1 have adjacent fluid pressure cylinders 18 each having a piston rod 17 that reciprocates up and down.
1 cylinder bracket for each 6 units
It is attached via 9. Below these cylinder brackets 19 are two adjacent water injection lever brackets 22 that swingably support a bell crank-shaped opening/closing lever 21 via pins 20 parallel to the width direction of the hot rolled steel plate 12. Nozzle 16
One end of the opening/closing lever 21 engages with the tip of the piston rod 17 of the fluid pressure cylinder 18, and as the piston rod 17 moves up and down, the other end of the opening/closing lever 21 engages with the tip of the piston rod 17.
It is designed to rotate up and down around the center. The other end of the opening/closing lever 21 is integrally provided with a holder 24 that holds a rubber lid 23 that can simultaneously close the openings of two adjacent water injection nozzles 16.
By operating a switching valve 25 connected to the fluid pressure cylinder 18, the vertical position of the piston rod 17 of the fluid pressure cylinder 18 is controlled.

In this embodiment, the cooling water 14 flowing out from two adjacent water injection nozzles 16 is controlled by one nozzle opening/closing means (consisting of a fluid pressure cylinder 18, a link mechanism, a lid 23, etc.). If temperature control is required, one water injection nozzle 1
It is desirable to provide one nozzle opening/closing means for each water injection nozzle 16, and from the opposite point of view, it is also possible to simultaneously control the opening and closing of three or more water injection nozzles 16 with one nozzle opening/closing means. Note that, as a matter of course, the water injection nozzle 16 whose opening and closing should be controlled is preferably set to correspond to the minimum width of the hot rolled steel plate 12 that passes over the runout table roller 13. In addition, in this embodiment, the water injection nozzle 1 is installed only above the hot rolled steel plate 12.
6 is disposed below the hot rolled steel plate 12, however, a water injection nozzle may also be disposed below the hot rolled steel plate 12 to simultaneously pour cooling water from below.

Therefore, the switching valve 2 is adjusted in accordance with the width of the hot rolled steel plate 12 passing over the runout table roller 13.
5, the hot rolled steel plate 1 is removed from the water injection nozzle 16.
By changing the width of the cooling water 14 poured into the hot rolled steel plate 12, it is possible to prevent excessive cooling of both widthwise ends of the hot rolled steel plate 12 and to control the temperature distribution to be uniform.

<Effects of the invention> Since the width of cooling water injection is changed according to the width of the hot-rolled steel plate, it is possible to maintain a uniform temperature distribution along the width direction of the hot-rolled steel plate, and the width of the hot-rolled steel plate is There is no possibility that distortion will occur due to non-uniform temperature distribution in the direction and the flatness will be impaired, and a homogeneous product can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the external appearance of one embodiment of the steel plate cooling device according to the present invention, Fig. 2 a is a mechanical conceptual diagram showing an enlarged structure of its main parts, and Fig. 2 b is its B-B
2c is a sectional view taken along the line C-C in FIG. 2a, and FIG. 3 is a front view showing the appearance of an example of a conventional steel plate cooling device. 14 is a hot rolled steel plate, 14 is a cooling water, 16 is a laminar flow nozzle, 18 is a fluid pressure cylinder, 2
0 is a pin, 21 is an opening/closing lever, and 23 is a lid.

Claims (1)

[Scope of utility model registration request] In a steel plate cooling device in which a number of laminar flow nozzles each pouring cooling water onto a hot rolled steel plate in a laminar flow are arranged linearly in the width direction of the hot rolled steel plate, the laminar flow nozzles located on both sides in the width direction A fluid pressure cylinder attached to the flow nozzle, a link mechanism provided at the lower end of the fluid pressure cylinder, and a lid provided on the opening/closing lever of the link mechanism so as to open and close the end of the laminar flow nozzle. Steel plate cooling device.