JPH0461052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a support floater that supports a traveling band plate in a non-contact manner using the static pressure of a fluid.

<Prior art> In continuous annealing lines and continuous plating lines for strips such as steel plates, or continuous electrolytic degreasing lines and continuous pickling lines that precede these lines, a guide device is required to guide the running of the strips. A guide roll is usually used. However, when performing surface treatment on the strip, a non-contact support floater is used that applies the principle of hydrostatic bearings, as shown in Figure 4, which shows its appearance, and Figure 5, which shows its cross-sectional structure. A top plate 5 having a smooth pressure-receiving surface 4 facing the strip plate 3 is attached to a box-shaped main body 2 whose interior is a chamber 1 for fluid such as air. Between the front and back ends of the upper plate 5 in the strip plate 3 passing direction and the main body 2, pressurized fluid is supplied from the chamber 1 communicating with a fluid supply source (not shown) via piping 6 to the center side of the pressure receiving surface 4. A slit-shaped fluid spout 7 that spouts obliquely toward
are formed respectively, and the strip plate 3 is supported on the supporting floater in a non-contact state by the static pressure of the pressurized fluid generated between the pressure receiving surface 4 and the strip plate 3.

<Problems to be Solved by the Invention> In the conventional support floater, the pressurized fluid ejected from the fluid jet port 7 flows from the gap between the pressure receiving surface 4 and the strip plate 3 in the width direction of the strip plate 3 (in FIG. , perpendicular to the plane of the paper), but because the gap between the center of the pressure-receiving surface 4 and the strip plate 3 is large, the leakage flow rate is extremely large and sufficient static pressure cannot be secured. There is. For example, as shown in FIG. 6, which shows the distribution of static pressure along the width direction of the strip 3, the strip 3
Since even the central part of the fluid reaches only about 30% to 40% of the theoretical value, the flow rate of the pressurized fluid from the fluid jet port 7 must be increased considerably, and a large-capacity fluid supply source is required. . Moreover, the supporting force at both widthwise ends of the strip plate 3 was extremely small, making stable support impossible.

In view of the above-mentioned problems with the conventional strip support floater, the present invention has been developed to reduce the leakage flow rate of pressurized fluid from the gap between the pressure receiving surface and the strip, and to support the entire strip with a large and stable force. The purpose is to provide a floater that can be obtained.

<Means for Solving the Problems> The support floater for a strip of the present invention includes a main body in which a smooth pressure-receiving surface facing the strip is formed directly below the strip, and a support floater for supporting the strip in the threading direction of the strip. Openings are made along the width direction of the strip at both front and rear ends of the pressure-receiving surface, and fluid is ejected diagonally upward toward the center of the pressure-receiving surface, so that the strip and the pressure-receiving surface are connected to each other. In a support floater for a strip plate, which is provided with a pair of fluid jet ports for generating static pressure of the fluid between them, buff-full plates extending in the threading direction of the strip plate are arranged along the width direction of the strip plate. The invention is characterized in that a plurality of protrusions are provided on the pressure receiving surface so as to.

<Function> Static pressure is generated between the strip plate and the pressure-receiving surface by the fluid ejected from the fluid jet port, and the strip plate is supported in a floating state from the pressure-receiving surface due to this static pressure. The fluid interposed between the strip and the pressure-receiving surface is prevented from flowing in the width direction of the strip by the baffle plate, and as a result, the amount of leakage is reduced and the state of threading of the strip is stabilized.

<Example> As shown in FIG. 1 showing the external appearance of an embodiment of the support floater for a strip according to the present invention and FIG. 2 showing its cross-sectional structure, the chamber 1 has a chamber 1 with a fluid such as air inside.
A top plate 15 having a flat pressure-receiving surface 14 facing the band plate 13 is integrally attached to the box-shaped main body 12 . Both front and rear ends of the upper plate 15 in the strip plate 13 threading direction (left and right direction in FIG. 2) and the main body 1
A slit-shaped fluid ejection port 16 is formed between the chamber 11 of the main body 12 and the main body 12 for ejecting the fluid sent into the chamber 11 obliquely toward the center of the pressure receiving surface 14. A fluid supply source (not shown) is connected via a pipe 17 connected to. In this embodiment, the fluid jet ports 16 are formed in the shape of a slit, but they can also be formed in the form of a large number of small holes arranged along the width direction of the strip plate 13. On the other hand, on the pressure receiving surface 14, a plurality of (four in this embodiment) buttful plates 18 extending in the threading direction of the strip plate 13 are protruded so as to be arranged along the width direction of the strip plate 13. The upper surface of the full plate 18 is formed in an arc shape so that the gap between it and the strip plate 13 is small. Distance L between the full plates 18 located on both sides of the band plate 13 in the width direction
are set to be equal to or smaller than the width of the strip plate 13, and these buff-full plates 18 do not necessarily have to be parallel.

Therefore, the fluid sent into the chamber 11 from the fluid supply source via the piping 17 flows through the fluid jet port 1.
6 to the gap between the pressure receiving surface 14 and the strip plate 13, where static pressure is generated. Band plate 13 and pressure receiving surface 1
The presence of the buffer plate 18 makes it difficult for fluid located in the gap between the strip plate 13 and the strip plate 13 to flow out to both sides in the width direction of the strip plate 13.
It becomes a state where it is suspended and supported.

For example, as shown in FIG. 3, which shows the distribution of static pressure along the width direction of the strip plate 13 according to this embodiment,
The supporting force is uniform throughout the width direction of the strip plate 13, and reaches approximately 50% to 60% of the theoretical value.

<Effects of the Invention> According to the support floater for a strip of the present invention, it is possible to reduce the leakage flow rate of fluid and increase the static pressure between the pressure receiving surface and the strip, and the entire region of the strip can be uniformly supported. This makes it possible to downsize the fluid supply source and provide stable support for the strip.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of one embodiment of the present invention, Fig. 2 is a sectional view showing its internal structure, Fig. 3 is a graph showing its static pressure distribution state, and Fig. 4 is a conventional belt FIG. 5 is a perspective view showing an example of a plate support floater, FIG. 5 is a cross-sectional view showing its internal structure, and FIG. 6 is a graph showing its static pressure distribution state. Also, in the figures, 12 is the main body, 13 is the band plate, 1
4 is a pressure receiving surface, 16 is a fluid ejection port, and 18 is a baffle plate.

Claims (1)

[Claims] 1. A main body in which a smooth pressure-receiving surface facing the strip plate is formed directly below the strip plate, and a main body having a smooth pressure-receiving surface facing the strip plate formed thereon, and a flat surface 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. a set of fluid ejection ports each opening and ejecting fluid diagonally upward toward the center of the pressure receiving surface to generate static pressure of the fluid between the strip plate and the pressure receiving surface; A supporting floater for a strip plate, characterized in that a plurality of buttful plates extending in the threading direction of the strip plate are protruded from the pressure receiving surface so as to be arranged along the width direction of the strip plate. Support floater.