JPS617015A - Strip cooling device - Google Patents

Abstract

PURPOSE:To provide the titled device making the adjustment in the cooling temp. of a strip easy as well as cooling efficiently by providing vertically movably the cooling water chamber that a slit shaped spouting water extends along the surface of a travelling strip to eliminate an obstacle for passing a strip. CONSTITUTION:The water spouting from a flat water pouring nozzle 14a is brought into contact with a travelling strip 2 and also flowed before and behind by a guide part 16a and the strip 2 is efficiently cooled. When the top and rear end of the strip 2 are run on a table, tha part composed of guide rolls 12, 13 and the guide part 16a is ascended and the water is poured in a slit lamina 19, which makes no obstacle for plate passing. The height in ascent makes the adjustment of the strip cooling possible as well. The cooling from the lower face of the strip is performed by plural fixed slit shaped nozzles 14b.

Description

[Detailed description of the invention] The present invention relates to a cooling device for strips 7''.

The hot-rolled strip is cooled to a certain temperature and then wound into a hot-rolled coil. The cooling and winding process is shown in Figure 1. 1 is a hot finishing mill located at the rear of the hot rolling equipment, and the high-temperature steel finish-rolled here) The IJ tube 2 is water-cooled to a constant temperature by a cooling device 3 installed on the runner out table. Koira 4
is taken care of.

As the cooling device 3, a water cooling method is adopted,
Conventionally, as shown in FIG. 2, a so-called hairpin lamina cooling method has been widely used in which a rod-shaped laminar flow of cooling water 6 is injected into the IJ tube 2 from a water injection header 5. but,
Since this method has poor cooling efficiency, recently, as shown in FIG. Lamina cooling methods are being adopted.

Improving cooling efficiency not only leads to energy savings, but also increases in the cooling rate of the strip lead to improvements in material quality, which may require further improvement in cooling capacity. Therefore, as shown in Fig. 4, a water jet cooling method is currently being developed that has a better cooling effect than the slit lamina cooling method described above, in which a forced cooling water stream 8 is blown over the two surfaces of the IJ tube. A method of calling is being considered. This water jet cooling system has about four times the cooling capacity of the conventional abin-raze cooling system, so it has many benefits such as water savings, smoke reduction in runner out table length, and a significant improvement in strip cooling speed. It has the following advantages.

However, this water jet cooling system has the following drawbacks in terms of equipment and cooling capacity.

Because it is necessary to generate a high-speed water flow that can even carry away the generated steam on the 2nd surface of the strip, the cooling water injection nozzles 9a and 9b are moved closer to the 2nd surface of the strip 7'', and the IJ tube is further removed. In order to form a cooling water chamber serving as a cooling waterway on 2, guides 10a and 1 are connected to nozzles 9a and 9b.
Therefore, when the tip of the strip 2 runs on the table roller, the cooling nozzles 9a, 9b and the guide portion Oa.

10b etc. may become an obstruction and make it impossible to thread the sheet.

In addition, since the cooling capacity per water injection nozzle is large, when cooling the IJ tag to the target winding temperature, sufficient temperature control cannot be achieved by only turning the water injection ON and OFF using the water injection nozzles 9a and 9b, and the strip The temperature accuracy of 7″2 becomes rough.

It is an object of the present invention to solve the above-mentioned problems and to provide a strip cooling device that does not impede IJ tag threading and can relatively easily adjust the cooling temperature of the strip.

The structure of the present invention that achieves the above object is based on the following:
The present invention is characterized in that a water injection nozzle having a guide extending along the IJ tube surface and forming a cooling water chamber with the strip surface is provided so as to be movable up and down with respect to the IJ tube surface.

Next, the implementation and implementation of the IJ lug disposal device according to the present invention will be explained in detail based on the drawings.

FIGS. 5(a) and 5(b) show schematic cross-sections of a strip cooling device according to an embodiment in different states. In the figure, reference numeral 11 denotes a table roller of the runner out table, on which the high temperature IJff2 is run and transferred. On the upper side of the table roller 11, rollers 12 and 13 which sandwich the strip 2 between the table roller 11 and the table roller 11 are provided in front and rear.
A water injection nozzle 14a is installed so as to be located approximately in the center between the nozzles 13 and 13. This water injection nozzle 14a is flat, and has a slit-shaped spout 21 at its lower part, and is connected to a ladder 15'a for supplying cooling water at its upper part. The lower part of the water injection nozzle 14a has a guide part 16a extending back and forth, and a cooling water chamber J7 is formed between the guide part 16a and the strip 2.
This is how it is configured. The cooling water supplied from the header 15a forms a high-speed water flow in the cooling water chamber 17, and is discharged by the roller 13 section.

These header 15a, nozzle/I/14a, guide part 1
The assembly 18a of the 6a10-ra 12, 13 etc. can be easily moved up and down and positioned relative to the surface of the strip 7'l'2 by a lifting device such as a hydraulic jack or a screw jack (not shown). On the other hand, below the running line of the strip 2, there is a water injection nozzle 14b facing directly below the strip running line from between the table reels 1.
is provided. The lower part of the water injection nozzle 14b is connected to a header 15b for supplying cooling water, and the water injection nozzle 1
A guide portion 16b is formed in the upper part of 4b to guide the cooling water along the strip 2. B) A plurality of water injection nozzles 14b are provided on the lower side of the IJ lug because the ejected cooling water falls due to gravity and cannot be cooled over a wide area. In addition, the lower assembly 1 of the strip 2
8b does not need to be vertically movable, but is provided in a fixed manner.

Next, the cooling action of the IJ tube 2 of the cooling device having the above configuration will be explained.

During strafing when the tip of the IJ 2 runs on the table roller 11, the IJ tube 2 may jump up and damage the passage through the upper water injection nozzle 14b, so the upper nozzle Assembly 1 such as 14b
As shown in FIG. 5(b), 8a is brought to a raised/lowered position in advance by a lifting device. At this time, a plate-shaped water film, so-called slit lamina 9, is sprayed from the water injection nozzle 14b and is injected into the slip lip 2, thereby performing cooling.

When the tip of the strip 2 is wound around the coiler and the strip f2 begins to run at increased speed while being under tension between the rolling mill and the coiler, the nozzle assembly 18a is rapidly lowered by the lifting device, as shown in FIG. 5(a). 2) It is positioned near the surface of the IJ f2, and the high-speed water flow (jet water flow) 20 provides highly effective cooling.

Further, when the rear end of the strip 2 passes through the rolling mill, the nozzle assembly 18a also rises to avoid collision with the rear end of the strip 2 that bounces up.

The temperature of the strip 2 can be adjusted by changing the height of the nozzle assembly 18a.

In the above embodiment, the water injection nozzle 14a is described as being integrated in the width direction of the strip f2, but the water injection nozzle 14a is divided in the width direction of the IJ tube 2, so that each divided water injection nozzle 14a can be raised and lowered. You can also do this.

As described above in detail with reference to one embodiment, according to the strip cooling device according to the present invention, (1) the strip cooling device can be moved up and down in such a way that it does not impede the threading performance of the tip and rear end of the IJ tube, and its position can be adjusted; Therefore, cooling is always achieved with high cooling efficiency using both high-speed water flow cooling and cooling using slit lamina 70. Therefore, the temperature of the strip f can be adjusted easily and with high precision.

[Brief explanation of the drawing]

Figure 1 shows an outline of the IJ lug cooling and winding process. Schematic diagram; Figure 2 is a perspective view of the cooling state using the hairpin lamina cooling method; Figure 3 is a perspective view of the slit lamina cooling method; Figure 4 is a perspective view of the cooling state using the hairpin lamina cooling method;
The figures are perspective views of the water jet cooling system, Figures 5(a) and 5(b).
) are sectional views showing different states of a strip cooling device according to an embodiment of the present invention. In the drawing, 2 is a strip, 11 is a table roller, 14a, 1.4b are water injection nozzles, 15a, 15b are headers, 16a, 16b are guides, 17 is a cooling water chamber, 18a, 18b is an assembly, 19 is a slit lamina , 20 is a high-speed water flow.

Claims (1)

[Claims] A water injection nozzle extending along the strip surface from a slit-shaped spout facing the surface of the strip being transported and having a guide that forms a cooling water chamber with the strip surface is provided so as to be movable up and down with respect to the strip surface. Strip cooling device.