JPH09279255A - Device for cooling metallic strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device for a metallic strip which improves a cooling treatment capacity without increasing the sets of pumps and spray- header tubes. SOLUTION: The spray-header tubes 4 providing spray-nozzles 6 faced to both sides while interposing the strip 3 shifted from the upper part toward the lower part in a cooling chamber 1, are arranged so as to become one group with plural pairs. At the lower part of the spray-header tube group, a trough 9 for receiving atomizing water at both sides interposing the strip 3 and an air nozzle header tube 12 having air nozzles for spraying the cooling water flowed out from the trough 9 to the strip 3, are arranged. By this constitution, the strip can efficiently be cooled without increasing a cooling water supplying equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal strip cooling device, and more particularly to a metal strip suitable for spraying cooling water with a spray nozzle onto a continuously moving metal strip to cool it to a desired temperature. The present invention relates to a cooling device.

[0002]

2. Description of the Related Art Conventionally, a metal strip (hereinafter,
A cooling device for a strip is known in which cooling water is sprayed onto a strip (referred to simply as a strip) with a spray nozzle to cool the strip to a desired temperature. This conventional cooling device is shown in FIG.
As shown in FIG. 2, two deflector rolls 2a and 2b are provided at the bottom of the cooling chamber 1 that is shaped like a side view, and the advancing direction of the strip 3 is changed by being guided by these deflector rolls 2a and 2b. On the inlet side of the cooling chamber 1, the spray header tubes 4 are vertically arranged on both sides of the strip 3 sandwiched between the strips. Two to three pairs of the spray header tubes 4 form one group, and each group is connected to an individual pump 5 by a pipeline. Spray header tube 4
Is provided with a plurality of spray nozzles 6 at intervals in the plate width direction of the strip 3, and the cooling water jetted from these nozzles 6 can be sprayed on the strip 3 in a uniform manner over the entire width. There is. Spray nozzle 6
The sprayed cooling water (spray water) is stored in the bottom portion of the cooling chamber 1, cooled through the heat exchanger 7 connected to the cooling chamber 1 by piping, and then injected into the tank 8 and re-cooled. It is supposed to be used. When the water level of the stored water in the cooling chamber 1 and the tank 8 falls below a predetermined level due to evaporation, it is automatically replenished from the water source.

[0003]

When the strip 3 is cooled by the strip cooling device shown in FIG. 5, the temperature of the strip at the outlet of the cooling chamber 1 does not hinder winding or other subsequent processing ( The number of spray header tubes 4 and the strip transport speed are set so that the temperature becomes 100 ° C. or less). By the way, the only way to improve the cooling efficiency is to increase the amount of cooling water sprayed from the spray nozzle 6, and therefore, it is conceivable to add a pump and a spray header pipe, but there is a drawback that the equipment cost rises. . SUMMARY OF THE INVENTION An object of the present invention is to provide a strip cooling device capable of improving cooling processing efficiency without adding a pump and a spray header pipe.

[0004]

In a cooling chamber, a plurality of pairs of spray header tubes having spray nozzles facing each other with a strip moving downward from above are provided. In a cooling device for a metal strip, an air nozzle header pipe having a gutter which receives spray water on both sides of the strip below the spray header pipe group and an air nozzle which scatters cooling water discharged from the gutter to the strip. And are provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a cooling device for a metal strip according to the present invention will be described with reference to FIGS. FIG.
The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. Below the lowest group of the three groups of spray header tubes 4 provided on the strip entrance side in the cooling chamber 1, flat plate-shaped gutters 9 are provided on both sides of the strip 3 with the strip 3 interposed therebetween.
The strip side end is obliquely provided so as to be lower than the counter strip side end. The gutter 9 has three sides, excluding the strip side, which are connected to the inner wall of the cooling chamber 1. Gutter 9
The strip side edge is bent upward to a rising edge 10 with a desired width. Notch portions 11 are formed on the rising side 10 at predetermined intervals in the width direction of the strip 3. An air spray header tube 12 connected to an air source (not shown) is disposed below the gutter 9. The air spray header tube 12 is provided with an air nozzle 13 whose ejection direction is directed to the strip 3 corresponding to the cutout portion 11 of the rising side 10. Reference numeral 14 is a heating furnace, and 15 is a straightening roll.

After the strip 3 exiting the heating furnace 14 passes through the straightening roll group 15 to remove the curl, it is passed through the cooling chamber 1 from the top to the bottom, and a cooling zone having a spray header tube group is provided. After passing through, deflector roll 2a
And then deflected horizontally, then deflector roll 2
At b, the coolant is turned upward, and the attached cooling water is wiped by the ringer roll 16 and sent to the rear equipment such as a winder. In the cooling zone, the cooling water ejected from each spray nozzle 6 is poured from top to bottom onto the strip 3 which is being transferred, and a part of the water adheres to the surface of the strip 3 and descends together with the strip 3, during which heat exchange is performed. Then, the strip 3 is cooled. Most of the cooling water adhering to the strip 3 drops from the strip 3 and reaches the bottom of the cooling chamber 1 before reaching the downstream deflector roll 2b. The sprayed water that is reflected from the strip 3 or floats without hitting the strip 3 drops as a water drop, and also adheres to the inner wall of the cooling chamber 1 and descends along the inner wall, and then is received by the gutter 9. After being gathered at the rising side 10 on the strip side, they flow down from the notch 11. Notch 1
When compressed air is ejected from the air nozzle 13 provided below 1, the cooling water discharged through the notch 11 is scattered by the compressed air and collides with the strip 3. For this reason, the cooling action is added to the strip 3 in the same manner as the addition of a pair of spray header pipes and pumps. The cooling water received in the gutter 9 has a temperature higher than that of the cooling water stored in the tank 8 before being ejected, but can be utilized as cooling water for the strip 3 having a temperature of 100 ° C. or higher. . The cooling water collected at the bottom of the cooling chamber 1 is cooled by the heat exchanger 7 on the way to the tank 8 and used again for cooling the strip 3. It is also possible to provide a gutter and an air nozzle header tube below each spray header tube group for all three groups of spray header tubes 4 provided on the strip entrance side in the cooling chamber 1.

[0007]

According to the invention of claim 1, the spray water ejected from the spray nozzle is received under the spray header pipe group and is scattered by the compressed air to the strip. It is possible to improve the cooling treatment efficiency of the strip without adding more.

[Brief description of drawings]

FIG. 1A is an explanatory diagram of a metal strip cooling device according to the present invention. (B) is an explanatory view of a main part.

FIG. 2 is a partially enlarged view of a portion A in FIG.

FIG. 3 is a front view taken along the arrow B of FIG.

FIG. 4 is a perspective view showing an arrangement of a gutter and an air nozzle.

FIG. 5A is an explanatory diagram of a conventional metal strip cooling device. (B) is an explanatory view of a main part.

[Explanation of symbols]

 1 Cooling Chamber 3 Strip 4 Spray Header Pipe 6 Spray Nozzle 9 Gutter 12 Air Nozzle Header Pipe 13 Air Nozzle

Claims (2)

[Claims] 1. A metal strip provided in a cooling chamber in such a manner that a plurality of pairs of spray header tubes having spray nozzles are provided so as to face each other with a strip to be transferred from the top to the bottom sandwiched therebetween. In the cooling device, below the spray header tube group, there are provided a gutter that receives spray water on both sides of the strip, and an air nozzle header tube having an air nozzle that scatters the cooling water discharged from the gutter to the strip. A cooling device for a metal strip. 2. A plurality of groups of spray header tubes are provided, and a gutter for receiving spray water is provided below each spray header tube group on both sides with a strip in between. Cooling device for the described metal strip.