JPH0576528B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a strip support floater that is attached to a continuous annealing furnace for metal strips such as steel strips and supports the strip in a non-contact manner during threading. Regarding.

<Prior art> In a continuous annealing line for metal strips, a continuous electroplating line, a continuous electrolytic degreasing line, a continuous pickling line, and a paper coater drying line, etc., a guide device is required to guide the movement of the strip. , and a guide roll is usually used. However, in continuous annealing lines, for example, the tensile strength of the strip decreases as the temperature rises above 800°C.
When the strip is supported and guided by guide rolls, the strip may be deformed due to uneven contact with the guide rolls. In order to prevent such deformation of the strip, there is a floater for supporting the strip that supports and guides the strip from below in a non-contact manner by applying gas pressure such as air by applying the principle of a hydrostatic bearing.

As shown in FIG. 6 showing its appearance and FIG. 7 showing its cross-sectional structure, this floater 1 includes a box-shaped main body 3 with a fluid chamber 2 inside.
An upper plate 5 having a smooth, flat pressure receiving surface 4 facing the band plate S is attached to the main body 3. This top plate 5
A slit-shaped fluid ejection port 7 is formed between the front and rear ends of the strip plate in the passing direction and the main body 3 to eject the pressurized fluid in the chamber 2 obliquely upward toward the center of the pressure receiving surface 4. , the strip plate S is moved to the floater 1 by the static pressure of the pressurized fluid generated between the pressure receiving surface 4 and the strip plate S.
Support it upward in a non-contact manner. Note that 6 is a pipe for supplying pressurized fluid into the chamber 2 from a fluid supply source (not shown).

<Problems to be Solved by the Invention> The strip S has a curved shape along the threading direction and is supported floating above the pressure receiving surface 4.
Since it was a smooth plane, the fluid ejected from the fluid jetting port 7 and flowing in the width direction of the strip S while being pushed between the pressure receiving surface 4 and the strip S was between the pressure receiving surface 4 and the strip S. A large amount of water had leaked out to the side through a gap with a roughly semi-cylindrical cross section. For this reason, it is not possible to secure a high static pressure between the strip S and the pressure receiving surface 4, and for example, as shown in FIG. In addition, this pressure decreases significantly toward the outside in the width direction of the strip S, making it impossible to stably support the strip S, or requiring a large-capacity fluid supply source. There was a problem.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a floater for supporting a strip plate with improved pressure efficiency between the strip plate and the pressure-receiving surface.

<Means for Solving the Problems> The floater for supporting a strip of the present invention includes a main body in which a pressure-receiving surface facing the strip is formed directly below the strip, and a pressure-receiving surface facing the strip along the threading direction of the strip. A band plate provided with a pair of fluid ejection ports each opening along the width direction of the band plate at both front and rear ends of the pressure receiving surface and ejecting fluid obliquely upward toward the center of the pressure receiving surface. The supporting floater is characterized in that the pressure receiving surface is formed into a convex shape that is raised and curved along the direction in which the strip passes.

<Function> Since the pressure-receiving surface is also curved and convex with respect to the strip curved in the threading direction in the floating supported state, the gap formed between the strip and the pressure-receiving surface is smaller than before. becomes smaller. Therefore, the amount of fluid flowing out to the side through this gap is reduced,
A high static pressure can be efficiently obtained between the pressure receiving surface and the strip plate. In addition, since the curved convex pressure receiving surface can be placed along the catenary curve determined by the weight and tension conditions of the strips between the floaters arranged in parallel, the contact between the pressure receiving surface and the strips can be improved. This can prevent scratches on the surface of the strip.

<Examples> Examples of the present invention will be described below with reference to the drawings. It should be noted that the same parts as those in the prior art are given the same reference numerals and redundant explanations will be omitted.

1 and 2 relate to one embodiment of the present invention, and FIG. 1 is a perspective view showing the appearance of a floater for supporting a strip plate;
FIG. 2 is a sectional view thereof.

The upper plate 15 provided in the strip support floater 10 of this embodiment has a cross-sectional shape along the threading direction of the strip S (arrow direction in the figure), and has a substantially semicylindrical shape with the center portion of the upper surface raised upward. As a result, the pressure receiving surface 14 has a curved convex shape corresponding to the shape of the curved strip S which is supported in a floating manner. For this reason,
The gap formed between the strip plate S supported above the pressure receiving surface 14 and this pressure receiving surface 14 has a substantially uniform width from the fluid jet port 7 at the front to the fluid jet port 7 at the rear. The gap has a thin circular arc shape, and its cross-sectional area is smaller than that of the conventional gap, which has a substantially semicylindrical shape.

Therefore, when fluid is ejected from the fluid jet port 7 to float and support the strip S by static pressure, the cross-sectional area of the gap formed between the strip S and the pressure receiving surface 14 is small, and the flow path resistance is small. Due to the large size, the fluid within this gap is difficult to flow out to the side (in the width direction of the strip S). Therefore, as shown in FIG. 3, the gap between the strip S and the pressure receiving surface 14 is approximately 15% compared to the conventional
Also, high static pressure can be obtained, and the strip S can be efficiently and stably supported.

In addition, a plurality of floaters 10 for supporting the strip plate are arranged along the threading direction of the strip plate S, and the strip plate S is continuously floated and supported by the plurality of floaters 10, so that the strip plate S is continuously buoyed and supported. The plate S draws a wavy catenary curve determined by the weight and tension conditions of the strip S between the floaters 10 arranged in parallel.
In this case, since the floater 10 has a curved convex pressure-receiving surface, the pressure-receiving surface can be aligned with the catenary curve of the strip S, thereby preventing contact between the pressure-receiving surface and the strip S. This contributes to the prevention of scratches on the surface of the strip S.

FIG. 4 is a perspective view showing the appearance of a floater for supporting a strip according to another embodiment of the present invention.

In the floater 20 of this embodiment, the pressure receiving surface 2
4 has its central part (section B in the figure) formed into a smooth plane as in the conventional case, and its both sides (section A in the figure) are buoyed and supported in a convex shape corresponding to the shape of the curved strip S. It is formed.

By making only both sides of the pressure receiving surface 24 convex in this manner, high static pressure can be obtained as in the above embodiment. That is, as shown in the figure, the fluid ejected from the fluid ejection port 7 flows between the flow flowing on the lower surface of the strip S in the direction of threading and the pressure receiving surface 24 of the strip S, and the width of the strip S is increased. However, since the flow in the width direction of the strip S mainly occurs on both sides (section A in the figure), it is the receiving pressure that causes this fluid to flow out to the sides. This is because the convex portion of the surface 24 prevents this.

The floaters 10 and 20 shown in each of the above embodiments both have a slit-shaped fluid jet port 7, but as shown in FIG. 5, a large number of circular holes are arranged in the width direction of the strip S. A fluid jet port 37 may also be formed.

<Effects of the Invention> According to the floater for supporting a strip of the present invention, the pressure receiving surface facing the strip is formed into a convex shape that is raised and curved along the threading direction of the strip. It is possible to increase the static pressure between the pressure-receiving surface and the strip by reducing the amount of leakage to the floater, and also to reduce the catenary curve determined by the weight and tension conditions of the strip between the floaters installed in parallel. By aligning the curved convex pressure-receiving surface with the strip, it is possible to avoid contact between the pressure-receiving surface and the strip, thereby preventing scratches on the strip surface, and as a result, the strip can be efficiently and stably supported. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a floater for supporting a strip according to an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a graph showing the static pressure distribution, and FIG. 4 is a diagram showing another embodiment of the present invention. A perspective view of a floater for supporting a strip plate according to an embodiment,
FIG. 5 is a perspective view of a floater for supporting a strip plate showing another aspect of the fluid jet port, FIG. 6 is a perspective view of a conventional floater for supporting a strip plate, FIG. 7 is a sectional view thereof, and FIG. 8 is a perspective view of the floater for supporting a strip plate. It is a graph showing static pressure distribution. In the drawing, 3 is the main body, 7 and 37 are fluid jet ports, and 1
4 and 24 are pressure receiving surfaces, and S is a strip plate.

Claims (1)

[Claims] 1 A main body in which a pressure receiving surface facing the strip plate is formed directly below the strip plate, and openings along the width direction of the strip plate at both front and rear ends of the pressure receiving surface along the threading direction of the strip plate. and a pair of fluid jet ports each spouting fluid obliquely upward toward the center side of the pressure receiving surface, wherein the pressure receiving surface is arranged along the threading direction of the strip. A floater for supporting a band plate, characterized in that it is formed in a raised and curved convex shape.