JPH07242952A - Device for floating up and supporting strip - Google Patents

Abstract

PURPOSE:To stably support a strip and to automatically center the strip even if the strip runs off during running, in a strip floating-up and supporting device for making the strip of a metallic strip run, etc., while supporting the strip under non-contacting and float-up state in a continuous heat treatment furnace, etc. CONSTITUTION:A horizontal flat plate part 3 mutually faced to the lower surface of the strip 2 is formed at the center part of the upper surface of a plenum chamber 1, and many gas jetting holes 4, 4, 4... are opened in this flat plate part 3. Side plate parts 5, 5 stood almost in the vertical direction are extended to both sides of the flat plate part 3 and gas jetting holes 6, 6, 6... are opened at the side plate parts 5, 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip levitation supporting device for non-contact supporting and conveying a strip such as a metal strip in a continuous heat treatment furnace in a levitation state.

[0002]

2. Description of the Related Art In order to prevent the occurrence of scratches when a strip such as a metal strip conveyed in a continuous annealing furnace comes into contact with a roll in the furnace, a strip is formed from a plenum chamber provided in the furnace. It has been conventionally known as a method of transporting a strip that the gas is blown toward the lower surface of the strip to float and support the strip by the gas pressure to support the strip in a non-contact manner.

In order to prevent the strips from shifting in the width direction and colliding with the furnace wall during traveling, for example, JP-A-63-176 is used.
In the levitation device disclosed in Japanese Patent No. 435, a pair of side plates b, b standing upright on the plenum chamber a are provided, and the side plates b, b are set to the width of the band plate c, as shown in the cross section of FIG. It can be adjusted accordingly. In the figure, d, d, d,
Shows a large number of gas outlets formed on the upper surface of the plenum chamber a.

Further, in the levitation device disclosed in Japanese Patent Laid-Open No. 61-261439, as shown in FIG. 8, the upper surface of the plenum chamber a facing the lower surface of the strip c is formed into a V shape having a low central portion. Slit-shaped outlets e, e formed at both ends of the plenum chamber a, which are formed in the front and rear of the running direction of the strip c along the width direction, are provided so that gas blows obliquely upward inward, respectively. A static pressure region is formed between the bottom surface of the strip c by the pair of outlets e, and the strip C is blown by the V-shaped slanting gas in the width direction.
It has a function of automatically correcting the deviation in the width direction of, i.e., a self-centering function.

[0005]

However, in the levitation device provided with the pair of upright side plates b, b as described above, the band c is largely displaced so that the band c is considerably close to the inner surface of one side plate b. There is a problem that the automatic correction force does not act unless the vehicle is in the normal state, which makes it difficult to obtain a stable running state.

Further, in the case of the levitation device having the V-shaped upper surface, the gas is constantly blown inward in the width direction on the lower surface of the strip c, so that the strip c is automatically displaced from the center of the conveying line. There is also a problem that the correction force acts and the running tends to be unstable.

[0007]

SUMMARY OF THE INVENTION The strip levitation support device of the present invention is intended to solve the above-mentioned problems, in which a horizontal flat plate portion facing the bottom surface of the strip is formed at the center of the upper surface of the plenum chamber. A large number of gas outlets are provided in the flat plate portion, side plate portions that stand upright substantially vertically are provided on both sides of the flat plate portion, and gas outlets are opened in the side plate portions. .

Further, in the strip levitation support device of the present invention, a horizontal flat plate portion facing the bottom surface of the strip plate is formed in the central portion of the upper surface of the plenum chamber, and the strip plate is provided at the front and rear edges of the flat plate portion in the running direction of the strip plate. A pair of slit-like fumaroles that open along the width direction of the plate are opened so that the gas blows obliquely upward inward toward the flat plate portion, and further stands substantially vertically on both sides of the flat plate portion. It is characterized in that a side plate portion is extended and a gas outlet is opened in the side plate portion.

It is desirable that the side plate portions be vertically erected on both sides of the flat plate portion or be slightly inwardly inclined (the inclination angle is limited to about 15 degrees).

[0010]

The strip plate can be stably supported by the gas blown from the gas blowout port or the slit-like blowout port formed in the flat plate portion. Further, when the strip plate is displaced in the width direction, the gas blown from the side plate portion suppresses the outflow of the gas upward, so that the correction force can be appropriately actuated in accordance with the displacement.

[0011]

Embodiments of the present invention will now be described with reference to the drawings.
In the embodiment shown in FIGS. 1 and 2, a flat plate portion 3 wider than the strip plate 2 is horizontally formed in the central portion of the upper surface of the plenum chamber 1,
Gas outlets 4, 4, each of which has a large number of small holes in the flat plate portion 3.
4, ... have been opened. Further, side plate portions 5 and 5 which stand vertically on both sides of the flat plate portion 3 are extended and are provided.
Similarly, gas outlets 6, 6, 6, which consist of many small holes
Open ... And blower 7 from blower (not shown)
The hot air such as non-oxidizing gas, reducing gas, etc., which has been pressure-fed into the plenum chamber 1 through the gas outlets 4, 4, 4, ...
And blow out from the gas outlets 6, 6, 6, ....

As described above, the gas blown directly above from the gas outlets 4, 4, 4, ... Is surrounded by the flat plate portion 3, the lower surface of the strip plate 2 and the both side plate portions 5, 5, so that the strip is stripped. The plate 2 can be stably supported. And the gas outlets 6, 6, 6,
The gas blown out of ... Limits the gas enclosed under the strip plate 2 as described above from passing upward through the gap between the strip plate 2 and the inner surfaces of the side plate portions 5, 5. For this reason, when the strip plate 2 is displaced in the width direction, the gap is further narrowed, and it becomes more difficult for gas to blow through. Therefore, the strip plate 2 becomes higher on the displaced side as shown in FIG. 3, and the self weight of the strip plate 2 is displaced. It works so that it will be corrected naturally.

In the embodiment shown in FIG. 4, the both side plate portions 5,
5 is inclined inward by about 10 degrees so that the gas blows out slightly downward from the gas outlets 6, 6, 6, ... Opened in the side plate portions 5, 5. In this way, by blowing the gas toward the both side edges of the strip 2 slightly downward from the gas outlets 6, 6, 6, ..., It is more effective that the gas under the strip 2 blows through the gap. Because it will be able to suppress
The centering function is further improved.

The above-mentioned correction force can be adjusted appropriately by adjusting the flow velocity of the gas blown out from the gas outlets 6, 6, 6, ... Can also be prevented.

On the other hand, in the embodiment shown in FIG. 5, the flat plate portion 3 is formed in the central portion of the upper surface of the plenum chamber 1, and the strip plate 2 is formed at both front and rear edges of the flat plate portion 3 which are in the front and rear directions of the strip plate.
A pair of slit-shaped fumaroles 8 opening along the width direction of the
8 is formed so that gas blows obliquely upward and inward toward the flat plate portion 3, and side plate portions 5 and 5 which stand upright on both sides of the flat plate portion 3 are extended. The gas outlets 6, 6, 6, ... Are opened in the side plate portions 5, 5.

As described above, the pair of slit-shaped fumes 8 and 8
Due to the opening, the static pressure region surrounded by the gas blown out from the fumes 8 is formed between the lower surface of the strip 2 and the upper surface of the flat plate portion 3, and the gas is formed on the lower surface of the strip 2. By applying the static pressure of, the strip 2 can be supported more stably. By forming the side plate portions 5 and 5 in this way, when the strip plate 2 is displaced, the distance between the inner surface of the side plate portions 5 and 5 and the side edge of the strip plate 2 is gradually narrowed, so the gas outlet 6 , 6, 6, ... Bringing out the effect of suppressing the blow-out of the gas by the gas blown out from the gas becomes more remarkable, so that a more stable centering function can be exhibited.

The flat plate portion 3 of the strip supporting device shown in FIG. 5 also has the gas outlets 4, 4, 4, as shown in FIG.
.. may be opened and the strip 2 may be floated and supported in cooperation with the gas blown from these.

Further, by blowing out the gas from the side plate portions 5 and 5 in this way, it is possible to flexibly cope with the width of the strip 2 and to levitate it regardless of whether the width is slightly wide or narrow. Allows you to support.

[0019]

As described above, the strip levitation support device of the present invention can stably support the strip, and when the strip is displaced in the width direction, a proper correction force is exerted to prevent the strip from wobbling in the width direction. There is a beneficial effect that a stable running state can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a strip levitation support device of the present invention.

2 is a cross-sectional view of FIG.

FIG. 3 is an operation state diagram of FIG.

FIG. 4 is a vertical cross-sectional view of a strip levitation support device showing another embodiment of the present invention.

FIG. 5 is a perspective view of a strip levitation support device showing another embodiment of the present invention.

6 is a sectional view taken along line AA of FIG.

FIG. 7 is a cross-sectional view of a conventional strip levitation support device.

FIG. 8 is a perspective view of a conventional strip levitation support device.

[Explanation of symbols]

 1 Plenum chamber 2 Strip plate 3 Flat plate part 4 Gas blowout port 5 Side plate part 6 Gas blowout port 8 Slit-shaped fumes

Claims (3)

[Claims] 1. A plenum chamber is provided with a horizontal flat plate portion facing the lower surface of a strip plate in the central portion of the upper surface thereof, a large number of gas outlets are formed in the flat plate portion, and substantially flat sides are formed on both sides of the flat plate portion. A strip plate levitation support device comprising a vertically extending side plate portion and a gas blowout opening provided in the side plate portion. 2. A pair of flat plate portions that are opposed to the lower surface of the strip plate are formed in the central portion of the upper surface of the plenum chamber, and a pair of the flat plate portions are opened at the front and rear edges of the strip plate in the running direction of the strip plate along the width direction of the strip plate. The slit-shaped fumaroles are opened so that the gas blows obliquely upward inward toward the flat plate portion, and side plate portions standing substantially vertically are extended on both sides of the flat plate portion. A strip levitation support device characterized in that a gas outlet is opened in the. 3. The strip plate levitation support device according to claim 1, wherein both side plate portions are inclined slightly inward.