JPH04118110A - Device for cooling continuous strip like sheet - Google Patents

Abstract

PURPOSE:To quicken the cooling of the continuous strip like sheet of high temperature and to reduce the number of nozzles by increasing greatly cooling capacity by giving the low frequency acoustic wave to the gas for cooling. CONSTITUTION:The continuous strip like sheet of hot temperature can be cooled in a short time without changing the speed of the conventional jet air for cooling to collide to the continuous strip like sheet, by giving the low frequency acoustic wave, making the local vibrating speed of the gas molecule faster as the acoustic wave vibration speed of high speed than the wind speed, increasing the coefficient of heat transmission. Therefore, the miniaturizing for the cooling device can be realized and also the capacity of the blower can be made small. And because the distance between the deflect rollers can be shortened, the height of the cooling tower becomes low. And the pressure of jetting air can be made low or the jetting volume can be reduced, so the collidising force of the little. Therefore, there is an effect for making the oscillating volume of the continuous strip like sheet little, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cooling device for a band-shaped metal plate that is continuously fed out in a high-temperature device.

<Prior art> Conventionally, when cooling a continuous band-shaped plate such as a high-temperature strip (a thin steel plate in the form of a band that is continuously fed out), a method of cooling both sides of the high-temperature strip with air jetted from an air nozzle has generally been carried out. It is being said.

<Problems to be Solved by the Invention> According to this method, in order to increase the cooling capacity of the cooling device, the air injection pressure p (kg/cm'') is increased to increase the impingement velocity V + of the air against the strip. (1+/5ec
), and the heat transfer coefficient KCkc between the air and the strip
aQ/z''h℃), increase the area of the nozzle opening to increase the air flow 1iQ (Nx'/■in), or increase the number of nozzles to increase the airflow Q (Hz3 /
5 inches) to increase the cooling capacity, but all of these methods have the drawback of increasing the size of the cooling device and increasing its cost.

In addition, increasing the air injection pressure p (kg/cm") or increasing the air volume Q (Nip'/win) increases the impact force F (&9) of the air on the strip, and Totally symmetrical air flow to.

Since it is practically impossible to make it uniform, the greater the above-mentioned impact force F (&9) of the air on the strip, the greater the absolute value of the unbalanced force ΔF (kg), so the amount of deflection of the strip. There is a drawback that δ(II) becomes large.

Therefore, if the deflection of the strip increases, there is a risk that the strip will come into contact with the tip of the nozzle orifice or other guides, causing scratches on the strip surface. When the gap C (Ill) between the tip and the strip is increased,
The velocity at which the blast air impinges on the strip V + (x/
There is a drawback that the air pressure (see ) decreases, and therefore the cooling effect decreases.
N13/i+in) needed to be increased, which necessitated an even larger cooling device.

As a result, in practice, there is an upper limit to the strip cooling effect of air injection, and in order to increase the strip cooling capacity, it is necessary to increase the number of nozzles and increase the length of the cooling zone. I had no choice but to use it as a device.

<Means for Solving the Problems> The present invention improves these various drawbacks, and in the continuous strip plate cooling device described above, the cooling gas is improved by applying low frequency sound waves with a maximum frequency of 50 Hz to the cooling gas. The cooling capacity is improved by promoting heat transfer between the gas and the object to be cooled, such as a continuous strip.

Generally, the heat transfer coefficient K (kca(1/
x”h℃) is the relative velocity between gas and solid V(i+/5e
It is well known that the larger e) is, the larger it is.

The present invention applies low frequency sound waves to the air injected from a conventional cooling nozzle group to promote and improve heat transfer between the air and the continuous strip plate.

That is, according to the present invention, the wind speed V can be increased by applying low frequency sound waves without changing the speed V, (1/5ee) at which the conventional cooling jet air collides with the continuous strip plate.
The acoustic vibration velocity V, (z
/5ee) to increase the local vibration speed of gas molecules,
By increasing the heat transfer coefficient K (kcal/x″h°C), it is possible to cool a high-temperature continuous strip plate in a short time.

Therefore, when cooling the same high-temperature continuous strip plate, if low-frequency sound waves are applied to the jet air as in the present invention, the same effect can be obtained even if the number of nozzles is reduced, and the cooling device can be made smaller. In addition, there is an advantage that the capacity of the blower can be reduced, resulting in an energy saving effect.

Moreover, if the cooling zone is shortened, the distance between the deflector rollers can be shortened, as can be seen from FIGS. Since the height of the cooling tower can be lowered, there are also ripple effects such as lower construction costs for factory buildings.

Further, as a further advantage of the present invention, the heat transfer coefficient K (kca(l/ x"h'c
) increases, the injection air pressure p (kg/
C1t) Low and low injection amount Q (Nx3/ lll
1n) can be reduced, and the impact force F' (kg) of the above-mentioned injected air against the continuous strip plate can be reduced. Therefore, since the unbalanced force ΔF(&y) becomes smaller, the amount of deflection δ(i+z) of the continuous strip plate also becomes smaller, which helps to prevent scratches on the surface of the continuous strip plate and prevents the conventional method such as continuous galvanizing. There is also the advantage that continuous strip processing equipment, such as the apparatus, can be operated at higher line speeds, increasing the capacity of continuous strip processing equipment.

Although the cooling gas has been explained above using air, it goes without saying that the gas is not limited to air and can be applied to any gas (including steam).

Further, in the above example, cooling of a continuous strip plate was explained, but if heated gas (including steam) is used as the gas, it can also be applied to drying a continuous strip plate.

Although the explanation has been given using a strip as an example of a continuous band-like plate, continuous band-like plates can also be strips, paper, or cloth.

It can be used for continuous strips of any kind of thin plate, such as films and vinyl sheets.

<Example> The present invention will be described in more detail below with reference to the accompanying drawings.

FIG. 1 shows the configuration of a conventional cooling device for continuous strip plates. The continuous strip plate l has two deflection rollers 2,
While moving between 2' in the direction of the arrow, it is cooled from both sides by the jetted air from the nozzle 3.

This air passes through a pipe 6 from a blower 5, passes through a distribution box 7, and is injected from a nozzle 3 or a nozzle group 4 onto the continuous strip plate l.

This nozzle group 4 operates as if the line speed of the continuous strip plate l is faster and the temperature of the continuous strip plate l to be cooled is higher.
A large number of nozzles 3 are required, and therefore the distance between the deflecting rollers 2, 2' becomes long.

Depending on the type of continuous strip processing equipment, this results in the equipment being higher than the roof of the factory building, resulting in a situation where a tower must be added to the building only in this area.

For example, in continuous galvanizing equipment, the height of the roof in FIG. 1 is generally higher than the height of the roof of the building, and therefore a tower is often installed in this area.

FIG. 2 is a detailed view of the nozzle 3, namely the nozzle header 8.
and shows the relationship between the air injected from the nozzle orifice 9 and the continuous strip plate 1, and the injected air spreads widely as it moves away from the nozzle, and the injected air velocity V + (1
/5ec) is generally known to become slower as the distance from the nozzle opening increases.

Therefore, if we consider only the cooling effect, the smaller the distance g (aria) between the nozzle orifice 9 and the continuous strip plate 1, the better; however, the continuous strip plate l swings in the direction between the nozzles and Since it moves in the direction of the arrow, there is a minimum required gap Q (WX) depending on the type of plant (continuous strip processing equipment) to prevent scratches from occurring on the surface of the continuous strip. What you need to do is as described above.

FIG. 3 shows an apparatus in which a low frequency sound generator 10 of the present invention is attached to a conventional cooling apparatus for continuous strip plates.

That is, the nozzle 3 or the nozzle group 4 is covered with a casing,
Low-frequency sound waves are applied to this area.

According to the method of the present invention, the cooling effect is higher than that of the conventional method, so the number of nozzle groups 4 is smaller than that of the conventional method shown in FIG. Since h + (zz) can be shortened to (xm), it is possible to lower the height of the tower mentioned above, and in some cases, it is also possible to store and install the deflector roller 2' in the ceiling of the building. There are some advantages.

Note that the low frequency sound waves can be applied by a low frequency sound wave generator such as that disclosed in Japanese Patent Publication No. 58-55834, for example.

Of course, the method is not limited to this method, and the type of low-frequency sound wave generator is not particularly limited, such as generating low-frequency sound waves by reciprocating a piston using rotational movement by a motor or magnetic force.

FIG. 4 is a cross-sectional view taken along the line A-A in FIG.
This figure shows the relationship between the injected air velocity Vr (x/5ec) and the movement of the low frequency sound vibration velocity V, (x/5ee) caused by the low frequency sound wave.

That is, it shows a low frequency sound wave generation source 11, a resonance tube 12 for making the effect of the low frequency sound waves more effective, and a cooling box 13 that covers the nozzle 3 and nozzle group 4.

As shown in FIG. 1, low-frequency sound waves generated by a low-frequency sound generation source 11 are applied to the air injected from the nozzle 3 or nozzle group 4 via the distribution box 7 through the pipe 6 from the blower 5. By providing a resonance tube 12 with a length of 174 times the wavelength of the sound wave, the resonance phenomenon is utilized to increase the low-frequency sound vibration velocity vt (it/5ee) of the air, and to improve the heat transfer between the continuous strip l and the air. This will further enhance the

FIG. 5 shows a case where the low frequency sound wave generator 10' is installed in the distribution box 7.

FIG. 6 shows a case where the low frequency sound wave generator 10' is installed in the pipe 6.

As shown in FIG. 4.5.6, the mounting method for the low frequency sound wave generator 10 can be selected depending on the equipment structure. This is especially true for existing equipment with low frequency sound generators 10.10.
This indicates that it is easy to install when modifying by adding .

<Effects of the Invention> As described above, the present invention dramatically increases the cooling capacity of a high-temperature continuous strip plate cooling device by applying low-frequency sound waves to the cooling gas injected from each nozzle. Since the cooling of the high-temperature continuous strip is promoted, the effect is that the number of nozzles can be reduced.

Furthermore, the cooling device can be downsized and the capacity of the blower can be reduced. Furthermore, the cooling zone can be shortened and the height of the cooling tower can be lowered, which has the ripple effect of reducing the construction cost of the factory building.

Also, the heat transfer coefficient K (k
Since ca (1/x'h'c) increases, the injection air pressure p Ckg/C1! ) or by reducing the injection amount Q(Nx''/5in), the collision force of the injected air against the continuous strip plate FCkg) can be reduced, so the deflection amount δ(II) of the continuous strip plate can be reduced. This has the effect of reducing surface scratches and preventing scratches on the surface.

It also has the effect of increasing the line speed of the continuous strip plate to improve operational efficiency.

[Brief explanation of the drawing]

Figure 1 is a front view and side view showing the configuration of a conventional cooling device for continuous strip plates; Figure 2 is an enlarged view of the nozzle portion;
Fig. 3 is a front view and a side view showing an embodiment of the present invention, Fig. 4 is a sectional view taken along line A-A of Fig. 3, and Fig. 5 is a low-frequency sonic generator installed in a distribution pipe. Figure 6 is a front view and side view showing an example in which a low-frequency sonic generator is installed in a piping section, l is a continuous strip plate, 2.2' is a Deflect roller 3 is a nozzle, 4 is a nozzle group, 5 is a blower, 6 is piping, 7 is a distribution box, 8 is a nozzle header, 9 is a nozzle orifice, and 10° 10' is a low frequency sonic generator. 3rd g Ring 4th 50th 6!21 December 10, 1990

Claims (3)

[Claims] (1) In a device that cools both the front and back sides of a continuous strip plate that is fed out at high temperature with gas injected from a plurality of nozzles provided across a feeding path, the cooling injected gas is generated by a low-frequency sonic generator. A cooling device for a continuous strip plate characterized by applying low frequency sound waves. (2) Claim (1) characterized in that a low-frequency sonic generator is attached to the blast pipe or distribution pipe of the gas for injection, and the gas to which the low-frequency sonic waves have been applied is injected from the nozzle.
Cooling device for continuous strips as described. (3) The continuous strip plate drying device according to claim 1, wherein the continuous strip plate is dried by injecting high-temperature gas from a nozzle.