JPS585730B2 - Cooling equipment for hot rolled materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for hot-rolled material, and more particularly, to a cooling device for hot-rolled material (strip), which cools the hot-rolled material (strip) on a hot run table between the time it comes out of the rolling mill and the time it is wound up. However, it concerns a cooling device that controls the temperature of the strip at that time.

For example, in continuous hot rolling equipment, a strip that has undergone finish rolling is water cooled while running on a hot run table, and is wound up when the temperature has dropped to a predetermined temperature.

The temperature at this time is determined by the quality of the product, and in addition to optimizing the temperature during rolling for metallurgical purposes, controlling the temperature of the strip on the hot run table at the appropriate winding temperature is also important for product quality. have a significant impact.

FIG. 1 shows a schematic layout of equipment generally referred to as continuous hot rolling equipment.

In the so-called cooling zone b on the hot run table a of this equipment, a laminar flow cooling type cooling device with good cooling effect is generally employed.

As shown in FIGS. 2 and 3, this device injects a column of cooling water e into a hot strip S from each of a number of siphon nozzles d attached to a water tank c.

In addition, f is a finish rolling mill, g is a coiler, and h is a roller.

Although the above-mentioned type of cooling device is an effective method of penetrating the water bath or vapor layer above the hot strip and bringing fresh cooling water into direct contact with the strip, recently,
As shown in Fig. 4, cooling water i in a plate shape (curtain shape) is flowed from the discharge nozzle of water tank c, which improves the cooling capacity even more and allows uniform cooling in the width direction of the strip. It has been confirmed that it has significant advantages.

However, in practice, the falling height of the water stream needs to be about 1.5m to 2m, so it is not easy to generate a stable falling water stream from the discharge nozzle to the top surface of the strip as a transparent water stream like a plate glass. There are problems such as the water flow breaking, or the flow speed becoming too fast, resulting in an opaque turbulent flow, which actually worsens the cooling effect.

The present invention solves the above-mentioned problems and provides a cooling device that can generate a plate-like falling water flow in a stable state, and further provides a cooling device that has the function of turning on and off the injection of cooling water. It is intended for this purpose.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 shows an embodiment of the cooling device of the present invention.

A is the direction in which the strip travels, and 1 is a water tank, which may be in the shape of a rectangular tank, but in this embodiment, it is a closed water tank in the shape of a circular pipe, with a drain port (2 ) and is installed at a predetermined height position above the strip in the width direction of the strip.

As shown in FIG. 6, a large number of air holes 3 are bored in the top surface of the aquarium 1, and an arc-shaped connecting pipe 4 that communicates with the inside of the aquarium 1 through the air holes 3 is attached to the aquarium 1. Furthermore, the water tank 1 is provided with a running water tank 5 which communicates with the inside of the water tank 1 via the connecting pipe 4 mentioned above.

The running water tank 5 is provided with an air vent valve 6 and a water supply pipe 7 for supplying cooling water into the tank 5.

Further, inside the water tank 1, a header 9 is inserted and installed which has a large number of water outflow holes 8 and supplies cooling water into the water tank 1, and a perforated plate with a large number of holes 10 for adjusting water flow. (Punched metal etc.) 11 is provided horizontally at a required height above the drain port 2.

A cock device (nozzle device) 12 is provided on the bottom surface of the water tank 1 in the strip width direction for blocking and blocking cooling water from falling from the drain port 2.

The cock device 12 has an upper drain hole 1 communicating with the drain port 2.
3 and a slit-shaped water outlet 14 at the bottom.
5, and a horizontal rotating column 17 having a nozzle-shaped hole 16 that can communicate with the drain hole 13 and water drop port 14 is inserted and arranged in the main body 15. As shown in FIG.
A driving device 19 is provided to rotate the cooling water around the rotating column 17, and a plate-shaped falling water flow 20 of cooling water is generated from the rotary column 17 from inside the water drop port 14, and the falling water flow 20 The generation is turned on and off by rotating the rotating column 17.

Further, below the cock device 12, a plate-shaped falling water stream 20 is provided.
A width adjusting body 21 for adjusting the width of the vehicle is provided so as to be horizontally movable in the front-rear direction via a link mechanism 22 (this drive source is not shown).

As for the planar shape of the width adjustment body 21, as shown in FIG. The plate-like falling water flow 2 is caused by the dogleg-shaped surface 23 which is displaced in the front and back direction as shown by the arrow as the width adjustment body 21 moves horizontally.
The width of 0 is adjusted.

Next, the operating procedure of the cooling device having the above configuration will be explained.

(1) When the rotating column 17 of the cock device 12 is rotated in the direction of arrow P, the nozzle-shaped hole 16 of the rotating column 17 is displaced to the chain line position, and the drain port 2 of the water tank 1 is closed.

(i1) Cooling water is supplied from the header 9 into the water tank 1 so that the water tank 1 is integrated and the running water tank 5 is at a certain height.

In this process, the air that existed in the water tank 1 before water supply is discharged from the air vent valve 6 through the air hole 3, the connecting pipe 4, and the water tank 5.

(iii) When the rotating column 17 of the cock device 12 is rotated in the opposite direction to the above and the nozzle-shaped hole 16 is displaced to the solid line position, the drain port 2 of the water tank 1 is opened and the cooling water is drained. Water drain port 14 via port 2, drain hole 13, nozzle hole 16
fall from

As a result of (iii) above, a plate-shaped falling water flow 20 of cooling water is generated, and the strip is cooled uniformly in the width direction by the falling water flow 20.

Note that cooling water is replenished from the water supply pipe 7 in order to prevent the water levels in the water tank 1 and running water tank 5 from decreasing due to (iii) above.

Here, in the case of the present invention, since the cross section of the water tank 1 is circular and the perforated plate 11 is provided in the central part of the circle with a large area, the water flow is adjusted by the perforated plate 11 and flows to the drain port 2. The narrow flow path and the presence of the perforated plate 11 rectify the water flow and guide it to the drain port 2.

In addition, by adjusting the amount of water supplied so as to generate negative pressure in the nozzle hole 16 and slowing down the flow velocity (initial velocity of falling water) of the falling water stream 20, there is less splashing on the strip surface and a transparent A plate-like falling water flow can be stably generated.

Also, since a cock device 12 is provided, the plate-like falling water flow 2
0 generation can be turned on and off automatically and easily.

Further, since the width adjusting body 21 having the dogleg-shaped surface 23 is provided, the width of the plate-shaped falling water stream 20 can be freely adjusted according to changes in the strip width, etc.

Next, FIG. 8 shows the main parts of another embodiment of the cooling device of the present invention.

In this embodiment, instead of the rotary nozzle type cock device 12 shown in FIG. 5, the nozzle body is formed of an elastic body, such as a rubber plate 24, and a stopper 25 and an eccentric cam are arranged to sandwich the lower end of the nozzle body from both the front and back sides. 26 is provided, and the rotation of the eccentric cam 26 presses the rubber plate 24 on one side in a direction perpendicular to the strip width direction to open the water drain port 1 at the tip of the nozzle body.
4 can be opened and closed, and the interval between them can be adjusted.

Therefore, by rotating the eccentric cam 26, generation of the plate-shaped falling water stream 20 can be automatically and easily turned on and off, and the thickness l of the falling water stream 20 can also be freely adjusted.

Further, FIGS. 9 and 10 show still another embodiment of the cooling device of the present invention.

In this embodiment, a fixed nozzle 27 is attached to the water tank 1 in place of the cock device 12 in FIG. A lower guide plate 29 with a water drain opening 14 is provided at a distance from each other, and as shown in FIG. A slide plate 31 having a planar shape formed in a circular arc shape is connected to the upper and lower guide plates 28,
The plate-like falling water flow 20 from the water drop opening 14 is turned on and off by the sliding of the slide plate 31, and the water flow 2
It is configured to adjust the width of 0.

Of course, the desired effect of the present invention can be achieved in this case as well.

In addition, in FIGS. 9 and 10, 32 is a link mechanism, and 33 is a cylinder iron.

As described above, the hot-rolled material cooling device of the present invention can (a) easily and stably generate a transparent plate-like falling water flow;

(b) Since the initial falling flow velocity is lower than in the conventional case, the falling cooling water does not bounce off the strip surface.

(c) Cooling efficiency is good due to (a) and (0) above.

(d) The plate-like falling water flow generation can be turned on and off at will, and the width of the water flow can be easily adjusted.

(e) Since the initial falling flow velocity is slow, the length of the plate-like falling water stream can be increased, so the space between the strip and the device can be widened.

Demonstrates excellent effects such as

[Brief explanation of drawings]

Figure 1 is a schematic layout of continuous hot rolling equipment, Figure 2 is the
FIG. 3 is an enlarged view of the main parts, FIG. 4 is a conceptual diagram showing another cooling method,
FIG. 5 is a cutaway side view of the cooling device of the present invention, and FIG.
7 is a schematic plan view of the main parts of the width adjustment device, FIG. 8 is a cutaway side view showing the main parts of another embodiment of the cooling device of the present invention, and FIG. 9 10 is a cutaway side view showing still another embodiment of the cooling device of the present invention, and FIG. 10 is a partially schematic plan view of the slide plate in FIG. 9. 1...Aquarium, 3...Air hole, 9...
... Header, 11 ... Perforated plate, 12 ...
...cock device (nozzle and device), 14...
Water outlet, 20...Plate-shaped falling water flow.

Claims (1)

[Claims] 1. In a hot-rolled material cooling device equipped with a slit nozzle for dropping a continuous plate-shaped water stream in the sheet width direction from a water tank placed above the hot-rolled material passing through, the water tank is of a closed structure. Features include an air vent at the top of the tank, a water drop slit nozzle that can drop and cut off the cooling water in the tank, and a water supply device that supplies cooling water into the tank. Cooling equipment for hot rolled materials.