JPS6232643Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling device for high-temperature steel that can maintain a predetermined pressure inside a header without complicated operations.

Cooling high-temperature steel materials to a predetermined temperature is important for improving product quality, and various cooling devices have been used heretofore.

An example of a conventional cooling device that allows a curtain film-like water flow to flow down is explained with reference to Fig. 1.
A nozzle 2 having a rectangular cross section is fixed to the lower part of a cylindrical header 1, a water supply pipe 3 is connected to the side of the header 1, and a water supply pipe 5 having an on/off valve 4 is connected to the water supply pipe 3. A substantially U-shaped drain pipe 6 is fixed to the upper part of the header 1, a receiving pipe 7 is arranged at the lower part of the drain pipe 6, and a shutter 9, which is opened and closed by a hydraulic cylinder 8, is attached to the lower part of the nozzle 2 and is rotated up and down. The pipes 10 and 11 which are movably attached and which send oil to the hydraulic cylinder 8 are provided with a switching valve 12.

In the above cooling system, when high-temperature steel is to be cooled, the on/off valve 4 is opened, the shutter 9 is opened by the hydraulic cylinder 8, and cooling water is supplied to the header 1 from the water pipe 5 through the water supply pipe 3. The cooling water supplied to the header 1 flows down from the nozzle 2 as a curtain-like water stream onto the high-temperature steel material, thereby cooling the steel material.

In addition, when cooling is not performed, the shutter 9 is closed and the on/off valve 4 is cut off to stop the supply of cooling water, but the water column H in the drain pipe 6 must be kept at a predetermined level. Then, when the shutter 9 is opened, the curtain film-like water flow flowing out from the nozzle 2 is disturbed, which adversely affects the cooling of the high-temperature steel material.
For this reason, conventionally, when stopping cooling, the hydraulic cylinder 8 is first activated to close the shutter 9, and then, when the water column H of the cooling water that has entered the drain pipe 6 from the header 1 reaches a predetermined level, On/off valve 4 was closed. However, this method was complicated and difficult to operate.

In view of this, the present invention has been developed so that even if the supply of cooling water is stopped and the shutter is closed at the same time, the drain pipe 6
An object of the present invention is to provide a cooling device for hot-rolled steel material that can easily maintain the water column H at a predetermined level.

Hereinafter, embodiments of the present invention will be described based on the drawings.

A flow control valve 13 is provided in the middle of the water pipe 5, and a water supply on/off valve 14 is provided upstream of the flow control valve 13.
At the same time, a water supply on/off valve 1 is installed in the water pipe 5.
Bypass pipe 1 connects the upstream and downstream sides of 4.
A regulating valve 16, a pressure reducing valve 17, and a check valve 1 are connected to the bypass pipe 15 from the upstream side to the downstream side.
8 are provided in sequence.

When cooling high-temperature steel materials, the water supply on/off valve 14
is open, the shutter 9 is also open, and the cooling water flows down from the nozzle 2 to the high-temperature steel material as a curtain film-like water stream.

When cooling is stopped, the water supply on/off valve 14 and shutter 9 are closed almost simultaneously. In this case, even if the water column H in the drain pipe 6 is lower than the required level, the water passing through the pressure reducing valve 17 from the bypass pipe 15 will flow through the water pipe 5,
The water is supplied to the drain pipe 6 through the water supply pipe 3 and the header 1, and the level of the water column H is adjusted to a predetermined height. Therefore, even when the water supply on/off valve 14 and the shutter 9 are opened again, a good curtain film-like water flow can be obtained.

FIG. 3 shows another embodiment of the present invention, in which a bypass pipe 15 is provided with a flow rate regulating valve 19. When the flow rate regulating valve 19 is adjusted to a predetermined state, water temporarily flows slightly, and then the water column H in the drain pipe 6 reaches a predetermined level due to the valve and internal resistance of the pipe.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

According to the hot-rolled steel cooling device of the present invention, even if the shutter and the water supply on/off valve are closed almost simultaneously, the water column in the drain pipe can be maintained at a predetermined level.
Therefore, various excellent effects such as easier operation can be achieved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional cooling device for high-temperature steel materials.
FIG. 2 is an explanatory diagram of one embodiment of the high-temperature steel cooling device of the present invention, and FIG. 3 is an explanatory diagram of another embodiment of the high-temperature steel cooling device of the present invention. In the figure, 1 is a header, 2 is a nozzle, 5 is a water pipe,
6 is the drain pipe, 9 is the shutter, and 14 is the water supply on/off.
Off valve, 15 bypass valve, 17 pressure reducing valve, 19
indicates a flow rate adjustment valve.

Claims (1)

[Scope of utility model registration request] In a cooling device equipped with a shutter that opens and closes the nozzle, a drain pipe that is approximately U-shaped and whose lower end is approximately at the same height as the vicinity of the lower end of the nozzle is connected to the upper part of the header that has a nozzle with a rectangular cross section. The water supply system is provided with an on/off valve for water supply, and a bypass pipe whose ends are connected above and downstream of the on/off valve, respectively, is provided with a valve that maintains the water column in the drain pipe at a predetermined level. A cooling device for hot-rolled steel material.