JPS633702Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a strip cooling device installed in continuous hot rolling equipment.

<Prior Art> A high-temperature strip that has been rolled in a continuous hot rolling facility and exits a finishing mill is cooled down to a predetermined temperature while running on a roller table, and is wound up as a hot-rolled coil in a winding machine. In this case, how to control the temperature so as to maintain the desired winding temperature over the entire length of the strip is a serious problem in terms of the quality of the steel product.

It is well known that in recent years, a laminar flow type cooling device, which has a large cooling effect, or a slit-lamina type cooling device, which has an even greater cooling effect, has been used to cool the strip. In these cooling devices, the amount of cooling water for temperature control has been controlled by opening and closing various valves. However, when controlling by opening and closing a valve, it takes a certain amount of time (2 to 5 seconds) to open and close the valve, and water drips or leaks before the flow of cooling water is completely stopped, making it difficult to control the cooling accurately. The reality was that unfavorable phenomena were occurring when carrying out such procedures. In recent years, computer control has been introduced with the intention of improving strip temperature control accuracy, and
How to open and close this cooling water at high speed and how to control the amount of cooling water accurately have become important issues.

For this reason, instead of controlling the opening and closing of cooling water using conventional valves, the amount of cooling water that flows out from the nozzle in the form of a laminar flow is kept constant, and this cooling water flow is blocked and opened using a shield to control the flow to the strip. Methods for controlling water injection have been developed and put into practical use.

FIG. 4 is a longitudinal cross-sectional view showing a typical example of a conventional strip cooling device that controls cooling water using a shield as described above. This device is normally installed above the roller table (runout table) on which the strip runs between the finishing mill and the winder of hot continuous rolling equipment (hot strip mill). Although the strip and roller table are not shown, the strip runs left and right parallel to the plane of the drawing.

Cooling water is ejected from a nozzle at the bottom of the cooling water nozzle header 01 provided above, and flows down onto the strip as a cooling water stream 02. A flapper 0 for blocking the cooling water flow 02 is provided below the nozzle header 01.
3 is provided. The flapper 03 has its lower end pivotally supported and its upper end connected to driving means such as an air cylinder 04.
It is configured so that it can be oscillated at high speed (for example, 0.5 seconds) between the position where the cooling water flow 02 is blocked (the position shown by the solid line in the figure) and the position where the cooling water flow 02 is released and allowed to flow down (the position shown by the chain line in the figure). has been done. Cooling water that is blocked by the flapper 03 and does not flow down onto the strip falls into a gutter 05 provided at the bottom of the device, and is discharged and collected outside the line.

In such a strip cooling device,
The flapper 03 is swung at high speed by the operation of the air cylinder 04, etc., and the cooling water flow 02 can be instantly switched between being shut off and opened, thereby eliminating the drawbacks of the method using the valve operation as described above. .

<Problems to be solved by the invention> However, in this device, when the flapper 03 is switched or when the flapper 03 is stopped in the middle to throttle the cooling water flow 02, the cooling water collides with the upper end of the flapper 03. The disadvantage is that large amounts of water may fall on the strip at once or in parts, creating disturbances that are undesirable for temperature control.
Moreover, this scattered water jumps out of the line and wets the floor surface, etc., contributing to environmental deterioration.

FIG. 5 is a diagram illustrating the operating process of the flapper 03 in this device, in which a shows a state in which the cooling water flow 02 is steadily flowing down, b shows a state in the middle of being blocked, and c shows a state in which the cooling water flow 02 is completely blocked and flows into the gutter 05. It shows.
As shown in FIG. b, during the process of shutting off, the cooling water flow 02 collides with the upper part of the flapper 03, becoming scattered water 002 and scattering back and forth. Especially fratsupa 0
As shown in the figure, a bent weir is provided at the upper end of the cooling water flow 02 to avoid overflow of water when normally c is shut off, so the cooling water flow 02 hits this weir and is violently scattered.

In view of the conventional problems mentioned above, this invention improves the structure of the flapper to eliminate the scattering of cooling water.
It is intended to provide a cooling device for a strip which makes it possible to control the temperature without disturbances caused by splashing water.

<Means for Solving the Problems> The present invention is a strip cooling device that cools the strip by causing cooling water to flow down from a nozzle onto the running strip, and the structure of the flapper that cuts off and opens the cooling water flow is improved to avoid splashing. It has a structure that does not generate water. That is, the strip cooling device of the present invention is provided with a flapper that blocks the flow of cooling water as necessary, a lever connected to the flapper, and a gutter that receives and discharges the cooling water blocked by the flapper. When the cooling water is made to flow down onto the strip, the lower end of the flapper, which is inclined downwardly toward the side edge of the gutter, is spaced apart from the side edge of the gutter, allowing the cooling water to flow down through the gap. The flapper is configured to be swingable by the lever so that when the flapper is shut off, the lower end of the flapper moves above the side edge of the gutter to allow cooling water to flow into the gutter.

<Function> In the strip cooling device of the present invention configured as described above, the cooling water that collides with the flapper falls into the gutter even when the flapper is switching between shutting off and opening the cooling water, and the cooling water falls onto the strip, etc. Do not generate splashing water.

<Embodiments> Hereinafter, the structure and operation of the present invention will be explained in more detail based on drawings showing embodiments of the strip cooling device according to the present invention.

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the strip cooling device of the present invention, and FIG. 2 is a cross-sectional view of a line provided with the above-mentioned device as viewed from the direction in which the strip travels.

As seen in the figure, as in the conventional example described above, the cooling water stream 2 flows down from the cooling water nozzle header 1 toward the strip 7 running on the table roller 6, and below the nozzle header 1 there is a cooling water stream 2.
A flapper 3 is provided to interrupt the operation as necessary. The gutter 5 for draining the blocked cooling water is provided at the bottom of the device, as in the conventional example described above, and the water that falls into the gutter 5 is discharged to the outside of the line through the drain pipe 8. be done.

In the present invention, the flapper 3 is arranged so that water flows down to the gutter 5 when the cooling water flow 2 is interrupted.
It has a shape that slopes downward toward the side edge of the gutter 5, and its both side ends are connected to the end of the lever 9. The other end of the lever 9 is pivotally supported by a bracket 10 installed on the upper part of the nozzle header 1, and is pivoted about the pivot shaft by the operation of the air cylinder 4 via the pivot shaft of the bracket 10. It will be done. Thus, the flapper 3 connected to the end of the lever 9 has two positions: a position where it blocks the cooling water flow 2 (the position indicated by the solid line in FIG. 1) and an open position which allows the cooling water flow 2 to flow down to the strip 7 (the position indicated by the chain line in FIG. 1). position) according to the operation of the air cylinder 4. Since the air cylinder 4 is operated very quickly, the switching operation between opening and closing by swinging the flapper 3 is performed at high speed (for example, within 0.5 seconds). In the open position, the lower end of the flapper 3 is separated from the side edge of the gutter 5 to provide a gap through which the cooling water flow 2 flows freely, and in the cutoff position, the lower end of the flapper 3 moves above the side edge of the gutter 5, and the flapper 3 The cooling water flow 2 cut off by the cooling water flow 2 is allowed to flow into the gutter 5.

Since the flapper 3 in the present invention has the above-described shape and structure, even when the flapper 3 cuts off the cooling water flow 2 in the middle of switching between shutoff and opening, the flapper 3 collides with the inner slope of the flapper 3 and is scattered. Water falls into the gutter 5 and does not scatter onto the strip 7 or the like. FIG. 3 is a diagram illustrating the operating process of the flapper in the device of the present invention, in which a shows a steady flow of the cooling water flow 2, b shows a state in the middle of being shut off, and c shows a completely shut off state. As seen in FIG. b, the splashed water 11 generated when the cooling water stream 2 collides with the flapper 3 during the shutoff process jumps toward the inside of the gutter 5 and falls into the gutter 5. It is preferable that the lever 9 be configured so that the movement of the flapper 3 when moving from opening to closing is such that it swings diagonally downward from above as shown by the arrows in Figures a and b.

<Effects of the invention> As is clear from the above explanation, the strip cooling device of the invention can supply and shut off the cooling water for cooling the strip running on the rolling line at high speed by operating the shield (flapper). In addition to being able to switch, it is possible to completely prevent water from scattering during the switching process, and it is possible to reliably and effectively control the winding temperature of the strip.

In addition, in the present invention, it is also possible to stop the flapper in the middle of opening and closing as required, and to adjust (throttle) the amount of cooling water without causing water scattering.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the strip cooling device of the present invention, Fig. 2 is a sectional view of a line equipped with the device of Fig. 1, seen from the strip traveling direction, and Figs. 3 a and b. , c are explanatory diagrams of the operating process of the flapper in the above device, FIG. 4 is a longitudinal sectional view showing an example of a conventional strip cooling device, and FIGS.
b and c are explanatory diagrams of the operating process of the flapper in the device of FIG. 4; In the drawing, 1 is a cooling water nozzle header, 2 is a cooling water flow, 3 is a flapper, 4 is an air cylinder, 5 is a gutter, 6 is a table roller, 7 is a strip, 8 is a drain pipe, 9 is a lever, 10 is a bracket, 11 is splashed water.

Claims (1)

[Scope of utility model registration request] A strip cooling device that cools the strip by causing cooling water to flow down from a nozzle onto the running strip includes a flapper that blocks the flow of cooling water as necessary, a lever connected to the flapper, and a lever that blocks the flow of cooling water by the flapper. and a gutter for receiving and discharging coolant water, and when the cooling water is allowed to flow down onto the strip, the lower end of the flapper, which is inclined downward toward the side edge of the gutter, is spaced apart from the side edge of the gutter, and a gap is formed between the gutter and the gutter. The flapper is configured to be swingable by the lever so that the lower end of the flapper moves above the side edge of the gutter and allows the cooling water to flow into the gutter when the cooling water is shut off. Cooling device for strips.