JPH0437889Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is applicable to silicon steel sheet heat treatment furnaces, galvanizing equipment,
This invention relates to a device for continuously cooling metal strips in stainless steel heat treatment furnaces, etc.

[Conventional technology and its problems]

As devices for cooling the metal strip extracted from the heating/soaking zone, there have conventionally been the water cooling jacket type shown in FIGS. 5 and 6, and the cooling tube type shown in FIGS. 7 and 8. In the water-cooled jacket type, the peripheral furnace wall surrounding the metal strip a supported by the hearth roll g has a jacket structure, and the cooling water supplied from the inlet b at one end is passed through the jacket j.
It circulates inside and flows out to the outlet c.
In addition, in the cleaning tube type, a plurality of tubes d are installed horizontally at the upper and lower parts of the strip A, inner tubes e are provided concentrically in each tube, and cooling air is supplied from one end f of the inner tube e. This is to cool the tube d. In these conventional cooling methods, the radiant heat from both sides of the strip a is absorbed into the jacket or tube to perform so-called radiant cooling, but in cooling devices with this structure, the temperature distribution in the width direction of the strip is poor, and both side edges are Since the central part tends to cool down faster than the central part, this has the disadvantage that the metal strip tends to have wavy or defective shapes, resulting in poor yield.

On the other hand, there is a convection cooling type (jet cooling type) in which plenum chambers are provided at the upper and lower parts of the metal strip, respectively, and the furnace gas is circulated through a cooler, and the cooled furnace gas is sprayed from the plenum chambers onto both sides of the strip. It is also well known that with this type, it is easy to adjust the amount of gas sprayed in the furnace at each point in the width direction of the furnace, so if you adjust it, there will be no drawbacks like the above-mentioned radiation cooling type.
This in-furnace gas convection cooling type has the disadvantage that equipment such as circulation fans and plenum chambers is expensive, and the metal strips are defective in shape due to overcooling, which is not necessarily a good idea.

[The purpose of the invention and the means to achieve it]

The present invention aims to provide a metal strip cooling device which compensates for the drawbacks of the radiation cooling type and convection cooling type, allows temperature distribution adjustment, and is excellent in terms of cooling performance and equipment cost.
To achieve this purpose, the cooling device of the present invention is provided with a cooling jacket or a cooling tube in which a cooling medium flows, facing one side of the metal strip being transported, and a furnace in which the cooling medium is circulated through the cooler. The metal strip is characterized in that a gas blowing passage for blowing out internal gas so as to face the other surface of the metal strip is divided into a plurality of sections in the width direction of the strip so that the blowing amount can be adjusted independently. It is something.

[Embodiment 1] In the embodiment shown in FIGS. 1 and 2, a cooling jacket 3 is formed below a metal strip 1 supported by a hearth roll 2 and conveyed horizontally, and a cooling jacket 3 is formed in the cooling jacket 3. Cooling water is supplied from an inlet 4, flows through the jacket, and is discharged from an outlet 5. Further, a gas blowing passage 6 is provided so as to face the upper surface of the metal strip 1.
a to 6e are divided into a plurality of sections in the strip width direction, and dampers 7a to 7e are provided in each of the gas blowing passages, respectively.
will be established. The dampers 7a to 7e are connected to the gas outlet passages 6a to 7e.
The opening amount of 6e can be adjusted individually. Reference numeral 8 denotes a circulation fan that absorbs furnace gas from the intake port 9 and pressure-feeds the furnace gas to gas blow-off passages 6a to 6e, and 10 represents a cooler that cools the absorbed furnace gas. Note that 11a to 11e are gas blowing passages 6a to 11e.
A damper is provided on the shaft 12 to adjust the gas movement in the furnace length direction at the outlet 6e, and the damper is tilted by operating a lever 13 provided at one end of the shaft 12.

In the cooling device constructed in this way, the lower surface of the metal strip 1 is cooled mainly by radiation by the cooling jacket 3, and the upper surface is mainly cooled by the furnace gases blown out from the gas blowing passages 6a to 6e. Cooled by convection. Cooling by convection is achieved by dampers 7a in the outlet passages 6a to 6e.
By adjusting .about.7e, the blowout amount of the furnace gas can be adjusted individually. For this reason, by reducing the amount of gas blowing out from the gas blowing passages 6a and 6e, which are located at both side edges of the strip 1, and increasing the blowing amount from the gas blowing passage 6c, which is located at the center of the strip 1, the cooling rate of both side edges is adjusted to the center. It can be equal to the middle part or slower than the middle part if necessary. Each of the gas blowing passages 6a to 6e has a constant length in the furnace length direction, and by adjusting the dampers 11a to 11e provided approximately in the middle thereof, the blowing position can be adjusted for gradual cooling in the furnace length direction. Adjustment is also possible.

[Example 2] The example shown in FIGS. 3 and 4 is as shown in FIG.
Although the cooling jacket 3 for radiation cooling in the embodiment shown in FIG. 2 is replaced by a cooling tube 14, the other configurations are the same as in the previous embodiment. An inner tube 15 is disposed in the cooling tube 14 and cooling air is supplied from one end 16 of the inner tube 15 to cool the tube and absorb the heat radiated from the lower surface of the metal strip 1.

[Effect of idea]

As explained above with respect to the embodiments, the metal strip cooling device according to the present invention cools the metal strip by radiation on one side, and on the other side by blowing in-furnace gas from the gas blowing passage divided into multiple sections in the width direction of the strip. Since the blowout amount can be adjusted as desired for cooling, the temperature distribution in the width direction of the strip can be adjusted as necessary, thereby preventing shape defects and improving yield. In addition, since only one side is convection cooling type, equipment costs are reduced, and the other side is radiant cooling, which has various advantages such as high cooling performance at high temperatures.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being a longitudinal cross-sectional view, Figure 2 being a cross-sectional view, and Figure 2 being a cross-sectional view.
FIG. 3 is a longitudinal cross-sectional view showing another embodiment, and FIG. 4 is a cross-sectional view thereof. 5 to 8 show conventional examples, FIG. 5 is a longitudinal cross-sectional view, FIG. 6 is a cross-sectional view thereof, and FIG. 7 is a vertical cross-sectional view showing another conventional example.
FIG. 8 is a cross-sectional view thereof. 1...Metal strip, 3...Cooling jacket, 6a-6e...Gas outlet passage, 7a-7e...
Damper, 14... Cooling tube.

Claims (1)

[Scope of utility model registration request] A cooling jacket or a cooling tube through which a cooling medium flows is provided so as to face one side of the metal strip being transported, and a cooling jacket or a cooling tube through which a cooling medium flows is provided so as to face the other side of the metal strip while the furnace gas is circulated through the cooler. 1. A metal strip cooling device characterized in that a plurality of gas blowing passages are divided in the width direction of the strip so that the blowing amount can be adjusted independently.