JPH0570709U - Hot steel plate cooling system - Google Patents

Abstract

(57) [Summary] [Purpose] With a simple structure, it is easy to maintain and it is possible to quickly switch between strong cooling and slow cooling. [Structure] The refrigerant header 1 includes an inner cylinder 2, an intermediate cylinder 3, and an outer cylinder 4.
And a triple cylinder. Water supply ports 2a and 3a are provided at one end of the inner cylinder 2 and the intermediate cylinder 3. A large number of pipe-shaped nozzles 8 are installed on the top of the outer cylinder 4 at predetermined intervals in the longitudinal direction of the refrigerant header 1. The inner cylinder 2 and the outer cylinder 4 are connected to each other by a number of rectifying tubes 7 arranged at predetermined intervals in the longitudinal direction of the refrigerant header 1. The bottom of the intermediate cylinder 3 has a large number of pores 9a at the discharge port.
The slit-shaped nozzle 9 which is opened is installed so as to project from the bottom of the outer cylinder 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for cooling a hot steel plate, and more particularly to a cooling apparatus capable of switching between normal strong cooling and mild cooling in accordance with a cooling pattern depending on a steel type or the like.

[0002]

[Prior Art]

 At present, most of the cooling devices applied to the cooling of hot steel sheets are pipe laminar type cooling devices in which a large number of laminar nozzles are provided in the longitudinal direction of the header and the refrigerant forms a laminar flow. This pipe laminar type cooling device is suitable for strong cooling, but even if the flow rate is reduced, the cooling capacity does not decrease so much.

By the way, the steel grades of steel sheets have been diversified from ordinary steels to special steels in accordance with the recent high grade, and some steel grades require slow cooling. Cooling conditions have come to be demanded, but an arbitrary cooling pattern is required to cope with this.

Therefore, as a pipe laminar type cooling device for obtaining an arbitrary cooling pattern as described above, Japanese Patent Laid-Open No. 63-50086 discloses a transmission type water dispersion plate just below a laminar nozzle of a pipe laminar type cooling device. It has been proposed that they are placed in a superposed state so that they can move in and out freely.

[0005]

[Problems to be solved by the device]

 However, the cooling device described in Japanese Patent Laid-Open No. 63-50086 has a large amount of equipment, resulting in high cost and a problem in maintainability.

The present invention has been made in view of the above-mentioned problems, and does not require large-scale equipment and is excellent in maintainability, and quick switching between strong cooling and slow cooling is possible. The purpose is to provide a simple cooling device.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a cooling device for a hot steel sheet according to the present invention comprises a refrigerant header having a triple cylinder including an inner cylinder, an intermediate cylinder, and an outer cylinder, and one end portion of the inner cylinder and the intermediate cylinder. In addition to providing a water supply port, a number of pipe nozzles are installed on the top of the outer cylinder in the longitudinal direction of the refrigerant header at predetermined intervals, and the inner cylinder and the outer cylinder are oriented in the longitudinal direction of the refrigerant header. They are connected by the rectifying cylinders arranged, and further, a slit-shaped nozzle having a large number of pores at the discharge port is installed at the bottom of the intermediate cylinder so as to project from the bottom of the outer cylinder.

[0008]

[Action]

 In the device of the present invention having the above-described structure, during normal strong cooling, when the refrigerant is supplied to the inner cylinder from the water supply port provided in the inner cylinder, the supplied refrigerant is rectified by the rectifying pipe and then is discharged to the outside. It is introduced into an annular space formed by a cylinder and an intermediate cylinder, and then flows out as a laminar flow from a pipe-shaped nozzle (Fig. 2 (a)). During slow cooling, when the refrigerant is supplied from the water supply port provided in the intermediate cylinder to the annular space formed by the intermediate cylinder and the inner cylinder, the supplied refrigerant flows out like a shower from the slit nozzle (Fig. 2). (B)).

[0009]

【Example】

 Hereinafter, the present invention will be described based on an embodiment shown in the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of a hot steel plate cooling device according to the present invention, FIG. 2 is a view similar to FIG. 1, (a) is a view showing flowing water state during strong cooling, (b) Is a diagram showing a flowing water state at the time of gentle cooling, and FIG. 3 is a schematic overall configuration diagram similar to FIG.

In the drawings, reference numeral 1 denotes a refrigerant header which constitutes a cooling device according to the present invention, and is constituted by a triple cylinder including an inner cylinder 2, an intermediate cylinder 3 and an outer cylinder 4, and an outer peripheral surface of the inner cylinder 2 and an intermediate cylinder 3 Ring-shaped spaces 5 and 6 are formed between the inner peripheral surfaces of the intermediate cylinder 3 and the outer peripheral surface of the intermediate cylinder 3 and the inner peripheral surface of the outer cylinder 4, respectively.

Reference numeral 7 denotes a rectifying tube which is arranged in the longitudinal direction of the refrigerant header 1 at a predetermined interval so as to connect the inner cylinder 2 and the outer cylinder 4, and one end of the inner cylinder 2 is provided. The coolant such as cooling water supplied from the water supply port 2a provided in the above is rectified and introduced into the space 6.

Reference numeral 8 denotes a pipe-shaped nozzle that is arranged on the top of the outer cylinder 4 at a predetermined interval and is arranged on both sides in the longitudinal direction of the refrigerant header 1 so as to be alternately distributed. The refrigerant, which has been rectified through the rectifying tube 7 and introduced into the space 6, is discharged as a laminar flow as shown in FIG.

Reference numeral 9 is a slit-shaped nozzle installed at the bottom of the intermediate cylinder 3 so as to project from the bottom of the outer cylinder 4, and a large number of fine holes 9 a are formed in the discharge port of the intermediate cylinder 3. The coolant supplied into the space 5 from the water supply port 3a provided at the end is made to flow out in the form of a shower as shown in FIG. 2 (b).

Reference numeral 10 denotes a three-way solenoid valve provided in the middle of the water supply pipe, which can be switched to send the refrigerant to the water supply port 2a or to the water supply port 3a depending on the type of steel material to be cooled. is there.

The hot steel plate cooling device according to the present invention is configured as described above, and when the steel plate is strongly cooled, the three-way solenoid valve 10 is switched to direct the refrigerant to one end of the inner cylinder 2. It is supplied to the provided water supply port 2a. The refrigerant supplied from the water supply port 2a to the inner cylinder 2 is guided to the space 6 in a state of being rectified through the rectification pipe 7, from which the refrigerant flows out through the pipe-shaped nozzle 8 as a laminar flow and the steel plate. Strongly cool.

On the other hand, when slowly cooling the steel sheet, the three-way solenoid valve 10 is switched to supply the refrigerant to the water supply port 3 a provided at one end of the intermediate cylinder 3. The refrigerant supplied from the water supply port 3a into the space 5 flows out like a shower from the large number of pores 9a of the slit-shaped nozzle 9 and gently cools the steel plate.

[0017]

[Effect of the device]

 As described above, the hot-rolled steel sheet cooling device according to the present invention is integrally configured with a triple cylinder, so that it is possible to quickly switch between strong cooling and slow cooling with a simple structure, and also maintainability is good. In this embodiment, the refrigerant header has a round shape, but it is needless to say that the refrigerant header may have a rectangular shape, and instead of the rectifying tube, a large number of holes are provided on the ceiling surface thereof. It may be slit-shaped.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a hot steel plate cooling device according to the present invention.

FIG. 2 is a view similar to FIG. 1, in which (a) is a diagram showing a flowing water state during strong cooling, and (b) is a diagram showing a flowing water state during gentle cooling.

FIG. 3 is a schematic overall configuration diagram similar to FIG.

[Explanation of symbols]

 1 Refrigerant Header 2 Inner Cylinder 2a Water Supply Port 3 Intermediate Cylinder 3a Water Supply Port 4 Outer Cylinder 7 Rectifier Tube 8 Pipe Nozzle 9 Slit Nozzle 9a Pore

Claims (1)

[Scope of utility model registration request] 1. A refrigerant header is constituted by a triple cylinder consisting of an inner cylinder, an intermediate cylinder and an outer cylinder, a water supply port is provided at one end of the inner cylinder and the intermediate cylinder, and a pipe-shaped nozzle is provided on the top of the outer cylinder. A large number of are installed in the longitudinal direction of the refrigerant header at a predetermined interval, and the inner cylinder and the outer cylinder are connected by a rectifying cylinder arranged in the longitudinal direction of the refrigerant header, and further, at the bottom of the intermediate cylinder, A cooling device for a hot steel sheet, characterized in that a slit-shaped nozzle having a large number of pores formed in a discharge port is provided so as to project from a bottom portion of an outer cylinder.