JPS6246248B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In continuous hot rolling equipment, the strip is cooled on a hot run table before it leaves the finishing rolling mill group and is wound up. This invention relates to a cooling device to be controlled.

Strip after finish rolling (hot rolled plate)
is water-cooled while running on a hot run table, and is wound up when the temperature drops to a predetermined temperature. The temperature at this time is determined by the quality of the product, and just as adjusting the temperature during rolling for metallurgical purposes, controlling the temperature of the strip on the hot run table mentioned above is important for product quality. This is extremely important as it has a huge impact on people.

The schematic layout of the equipment generally called continuous hot rolling equipment is shown in Fig. 1, in which the strip b coming out of the heating furnace a is connected to the vertical edger c,
After passing through a rough rolling mill d, a finishing rolling mill e, a hot run table f and a cooling zone g, it is wound up by a coiler h, and the cooling zone g on the hot run table f has a good cooling effect. A cooling device using the laminar flow cooling method is adopted. As shown in FIG. 2, this cooling device injects a column of cooling water k into a high-temperature strip b from a number of siphon nozzles j attached to a header i. This type of cooling device is effective because it can penetrate the water layer or vapor layer on the high-temperature strip b and bring fresh cooling water into direct contact with the strip. The cooling efficiency is further improved by flowing the cooling water m in the shape of a water plate from the slit nozzle l, and there are excellent advantages such as uniform cooling in the width direction of the strip b. After the water is temporarily stored in a water storage tank o, cooling water m in the shape of a water plate is dropped from a slit nozzle l with an open top for cooling. However, in practice, it is 1.5 m to 2 m to create a water plate-shaped cooling water m.
It is very difficult to stably generate a falling water flow from the slit nozzle L to the top surface of the strip B as a transparent water flow like a plate glass, and the water flow may break or the flow speed increases. This may cause problems such as opaque turbulent flow, which may worsen the cooling effect, or it may be difficult to stably adjust the width of the falling cooling water m without causing turbulence in the water flow. I had this problem.

The present invention was made in an attempt to stably adjust the water flow width of such a plate-shaped cooling water flow. A shielding mechanism is provided on both width ends of the inter-rolled plate to shield the cooling water falling to a required width.

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

5 and 6 are general views showing an example of the present invention, in which a water supply pipe 2 of an appropriate length branched from a main pipe 1 is fixedly supported on a fixed frame 3 via a fixed bracket 4, and Its distal end is sealed with a closure device 5. A rotating cylindrical body 8 is provided on the outer periphery of the water supply pipe 2 and is equipped with bearings 6 and sealing devices 7 at both ends and can rotate while keeping the outer periphery of the water supply pipe 2 airtight. A slit-like opening 9 of an appropriate length is provided at the top of the rotary cylinder 8, and the upper part of the rotary cylinder 8 has one end connected to the slit-like opening 9 and the other side extending vertically downward. A slit nozzle 10 having a substantially semicircular arc shape with an opening
is provided. Furthermore, a cooling water recovery plate 11 is installed at the bottom of the rotary cylinder 8 for blocking the plate-shaped cooling water 22 discharged from the slit nozzle 10 and adjusting its width. It is placed so as to wrap around the sides. The cooling water recovery plate 1
The opening discharge side of the slit nozzle 10 in 1 has a recovery gap 12 between it and the rotating cylinder 8, and as will be described later with reference to FIG.
a parallel portion 23a parallel to the plate-shaped falling cooling water 22;
It is provided with an inclined part 23b for shielding and collecting the outer side in the width direction of the cooling water 22 to adjust the cooling width, and furthermore, on one side of the bottom thereof, there is an end of a drain pipe 14 that guides water to the drain groove 13. The parts are connected. Further, a large number of water holes 15 are provided at equal intervals on the lower half of the outer circumference of the water supply pipe 2 at a position substantially equivalent to the position where the slit nozzle 10 is provided. Further, a cylinder 17 is connected with a pin 18 to a bracket 16 provided on the fixed frame 3, and the tip of the cylinder rod 19 is connected with a pin 21 to a bracket 20 provided on the outer periphery of the rotating cylinder 8, so that the operation of the cylinder 17 causes the The rotary cylinder body 8 is configured to be rotatably driven.

According to the above configuration, the cooling water flowing through the water supply pipe 2 first enters the rotary cylinder body 8 through the water passage hole 15 provided in the lower half of the outer circumference of the water supply pipe 2, and then enters the rotary cylinder body 8. 8, the water flows through the slit nozzle 10 provided at the top and is discharged from its vertical opening as a plate-shaped cooling water 22, forming a stable water flow that cools a strip (not shown). conduct. Also, from the illustrated state, the cylinder 17 is contracted to rotate the rotary cylinder 8, and the cooling water recovery plate 1 is rotated.
1 is extended to the right side in FIG. The width of the plate-shaped cooling water 22 can be adjusted by returning the plate-shaped cooling water 22 to a tank (not shown) or the like through the filter to arbitrarily block the drop of the plate-shaped cooling water 22.
Alternatively, the cooling operation of the strip can be stopped.

FIGS. 7 and 8 show other detailed examples of the cooling water recovery plate (shielding mechanism), in which the rotary cylinder 8 in the above embodiment is replaced with a fixed cylinder 8', and the fixed cylinder 8' A cooling water recovery plate 24 equipped with a width adjusting plate 23 is rotatably attached to the lower part of the plate 24 about a fulcrum pin 25. It has a parallel part 23a provided parallel to 22, and inclined parts 23b provided so as to be inclined at a predetermined angle with respect to the plate-shaped cooling water 22 on both sides. In this embodiment, by rotating the cooling water recovery plate 23, the falling width of the plate-shaped cooling water 22 is moved from both ends toward the center between the discharge width of the slit nozzle 10 and the width of the parallel portion 23a. The cooling water can be used effectively by adjusting the width of the strip. 7th
Figures A, B, and C perform the above action,
A is a state in which strip cooling is being performed across the entire width of the plate-shaped cooling water 22 as shown in Fig. 8 A', B is a state in which the width of the plate-shaped cooling water 22 is being adjusted as shown in B', and C is a state in which strip cooling is being performed across the entire width of the plate-shaped cooling water 22 as shown in Fig. 8A'.
As shown in C', all of the plate-shaped cooling water 22 is collected by the cooling water recovery plate 24 and cooling of the strip is stopped.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and that the shape of the cooling water recovery plate can be changed in various ways, and that various devices can be adopted as rotational drive devices for the rotating cylinder and the cooling water recovery plate. It goes without saying that other modifications may be made without departing from the gist of the present invention.

According to the cooling device for a hot rolled plate of the present invention described above, by providing the cooling water shielding mechanism, the width of the plate-shaped cooling water can be adjusted, and the cooling water can be recovered to stop the cooling operation at will. The cooling water can be used effectively, and the width of the plate-shaped cooling water can be adjusted by blocking part of the plate-shaped cooling water in the width direction after the shielding mechanism has discharged it from the slit nozzle. This provides excellent effects such as making it possible to stably adjust the width without causing any turbulence in the falling flow of cooling water.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an outline of a general continuous hot rolling equipment, Fig. 2 is a perspective view showing an example of a conventional cooling device, Fig. 3 is a cut side view showing yet another conventional example, and Fig. 4 is a view taken along the - arrow in FIG. 3, FIGS. 5 and 6 are an overall cutaway side view and front view showing one embodiment of the present invention, and FIG. 7 is a cutaway view showing another detailed example of the shielding mechanism. It is a side view, and A, B, and C each show an operating state, and FIG. 8 is a - arrow direction view of FIG. 2 is a water supply pipe, 8 is a rotating cylinder, 8' is a fixed cylinder,
10 is a slit nozzle, 11 is a cooling water recovery plate, 1
7 is a cylinder, 22 is a cooling water plate, 23 is a width adjusting plate, 24 is a cooling water recovery plate, and 25 is a fulcrum pin.

Claims (1)

[Claims] 1. A shielding mechanism is installed at the bottom of the slit nozzle to block the cooling water that protrudes from the slit nozzle into the falling part of the cooling water that falls in a plate shape and falls to both width ends of the hot rolled plate by a required width, thereby reducing the water flow width. 1. A cooling device for hot rolled plates, characterized in that it allows adjustment of the temperature.