JPH0463131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a support floater that can support a traveling strip plate by rollers as necessary and can also support it 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, as well as 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 used. However, in a continuous annealing line, for example, the tensile strength of the strip decreases as the temperature rises above 800°C, so if the strip is supported and guided by guide rolls, the strip will be deformed due to uneven contact with the guide rolls. There are cases. In order to prevent such deformation of the strip, a support floater is developed that applies the principle of static pressure bearings to support and guide the strip from below in a non-contact manner using the pressure of _H2 - _N2 mixed gas, etc. It is used.

The support floater 1 has an internal structure as shown in FIG. 3 showing its appearance and FIG. 4 showing its cross-sectional structure.
It has a box-shaped main body 3 which serves as a chamber 2 for a fluid such as H ₂ -N ₂ gas, and an upper plate 5 having a smooth pressure-receiving surface 4 facing the strip S is attached to the main body 3. Between the front and back ends of the upper plate 5 in the strip plate S passing direction and the main body 3, pressurized fluid is supplied from the chamber 2 communicating with a fluid supply source (not shown) via piping 6 to the center side of the pressure receiving surface 4. Slit-shaped fluid ejection ports 7 are formed to eject the fluid obliquely toward the supporting floater 1, and the static pressure of the pressurized fluid generated between the pressure receiving surface 4 and the strip S causes the strip S to be pushed onto the support floater 1. It is designed to be supported in a non-contact manner.

<Problems to be Solved by the Invention> In the support floater 1 as described above, since the pressure receiving surface 4 was smooth, the fluid ejected from the fluid jetting port 7 was forced between the pressure receiving surface 4 and the strip plate S. It flows in the width direction of the strip S, resulting in a very large leakage flow rate, which has the disadvantage that sufficient static pressure cannot be ensured. For example, as shown in Fig. 5, even at the center of the strip S, the pressure reaches only about 30% to 40% of the theoretical value, and this pressure decreases greatly toward the outside in the width direction. Stable support for the fluid was not possible, or a large capacity fluid supply source was required.

As a support floater that eliminates the above-mentioned drawbacks, there are the following support floaters. As shown in FIG. 6, which shows the appearance of this support floater,
A plurality of buttress plates 8 that follow the deformation of the strip S due to its own weight are provided protrudingly on the pressure receiving surface 4 so as to extend in the threading direction of the strip S and are arranged along the width direction of the strip S. It is. According to this support floater,
The fluid pushed between the pressure receiving surface 4 and the strip plate S becomes difficult to flow in the width direction of the strip plate S by the baffle plate 8, the leakage flow rate decreases, and the supporting force due to the fluid becomes as shown in Fig. 7. As shown, it is made uniform in the width direction of the strip S and reaches about 50% to 60% of the theoretical value.

Although the support floater equipped with the buff-full plate 8 has greatly improved performance, the following requirements may arise depending on the actual usage. That is, for example, when first passing the strip S through the line (referred to as threading), it is more dynamically advantageous to support it using guide rolls than to support it with a support floater.
There was a demand for using either non-contact support using support floaters or contact support using guide rolls as needed.

The present invention has been made in view of the above-mentioned conventional circumstances, and provides a support floater that can support a strip plate with a large and stable force in a non-contact state, and can also support a strip in a contact state with rolls if necessary. The purpose is to

<Means for Solving the Problems> The support floater for a strip of the present invention includes a main body in which a first pressure receiving surface and a second pressure receiving surface facing the strip are formed directly below the strip; openings along the width direction of the strip at both front and rear ends of each of the first and second pressure-receiving surfaces along the threading direction of the strip, and diagonally toward the center of each pressure-receiving surface. a fluid spout that spouts fluid upward to generate static pressure of the fluid between the strip plate and the pressure-receiving surface; a plurality of buttress plates protruding from each of the first and second pressure-receiving surfaces so as to be arranged in the width direction of the strip plate at the boundary between the first pressure-receiving surface and the second pressure-receiving surface; and a roll that extends along the buff-full plate and is movable up and down so as to protrude upward from the buff-full plate.

<Function> When supporting the strip in a non-contact manner, the roll is positioned below the upper end of the baffle plate, and the strip is supported by the fluid ejected from the fluid jetting ports. On the other hand, in special cases such as threading, a roll is made to protrude upward from the buttful plate, and the strip is supported by this roll in contact with it.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 relate to an embodiment of the present invention, and FIGS. 1a and 1b are side views of the strip support floater in a contact support state and a non-contact support state, respectively, and FIGS.
The figure is a plan view of the support floater for the strip.

As shown in the figure, a box-shaped main body 12 whose interior is a chamber 11 for a fluid such as H ₂ -N ₂ mixed gas has a first pressure receiving surface 14a and a second pressure receiving surface 14b facing the strip S, respectively. Upper plates 15a and 15b are integrally attached. A recess 16 extending in the width direction of the strip S is formed at the boundary between the upper plates 15a and 15b arranged in the threading direction of the strip S.
In this recess 16, a roll 17 extending in the width direction of the strip S is provided with a double plate 20a, 2 which will be described later.
It is provided so as to be movable up and down in the vertical direction in FIG. 1 so as to protrude upward from the upper end of 0b. Further, at both front and rear ends of each pressure-receiving surface 14a, 14b in the strip passing direction, slit-shaped fluid ejection ports 18a are provided for squirting the fluid fed into the chamber 11 obliquely toward the center of each pressure-receiving surface 14a, 14b. ,1
8b are formed in two rows each, and the chamber 11
A fluid supply source (not shown) is connected therein via a pipe 19 connected to the main body 12. In this embodiment, the fluid ejection ports 18a and 18b are shaped like slits, but they can also be shaped like a large number of small holes arranged along the width direction of the strip plate S. Each pressure receiving surface 14a, 1
It may be of a two-part type corresponding to 4b.

A strip plate S is provided on each pressure receiving surface 14a, 14b.
A plurality of (four each in this embodiment) buttful plates 20a, 20b extending in the sheet passing direction are arranged in a protruding manner so as to be arranged along the width direction of the strip S,
The upper edge of the continuous baffle plates 20a and 20b has an arc shape that follows the deformation of the strip S due to its own weight.

Therefore, when the roll 17 is lowered by a known elevating mechanism (not shown) and positioned below the upper ends of the buttful plates 20a and 20b as shown in FIG. 1b, the fluid supply source is The fluid sent into the chamber 11 from the pipe 19 through the respective fluid jet ports 18a, 1
When the fluid is blown from 8b into the gaps between the respective pressure receiving surfaces 14a and 14b and the strip S, this fluid is difficult to flow out in the width direction of the strip S due to the presence of the full plates 20a and 20b, so the strip S is placed under high pressure. It can be floated and supported in a non-contact state using the static pressure of the fluid.

On the other hand, the roll 17 is raised by the lifting mechanism to a position where it protrudes above the upper ends of the buttful plates 20a and 20b as shown in FIG. When rotated at the same speed as the threading speed of the strip S, the strip S can be supported in contact with the roll 17 during threading or the like. In addition, when supporting the strip S with the roll 17 in this way, the fluid may or may not be ejected from the fluid ejection ports 18a and 18b, and there are various options as to whether or not to use static pressure due to the fluid. It is selected as appropriate depending on the conditions.

<Effects of the Invention> According to the support floater for a strip according to the present invention, the leakage flow rate of fluid is reduced, the static pressure between the pressure receiving surface and the strip is increased, and this static pressure is spread in the width direction of the strip. Since the fluid can be applied uniformly, the fluid supply source can be relatively miniaturized and the strip can be supported stably. And in cases such as threading, etc.
It is possible to switch to support by rolls depending on the actual usage condition, which is advantageous in terms of power and expands the versatility of the strip support floater.

[Brief explanation of the drawing]

Figures 1a, b and 2 relate to an embodiment of the present invention, Figures 1a and b are side views of the strip support floater, Figure 2 is a plan view thereof, and Figure 3 is a conventional FIG. 4 is a cross-sectional view showing its internal structure, FIG. 5 is a graph showing its static pressure distribution, and FIG. 6 is a perspective view showing an example of a conventional band support floater. FIG. 7 is a perspective view showing an example of this, and FIG. 7 is a graph showing the static pressure distribution. In the drawings, 12 is a main body, 14a and 14b are pressure receiving surfaces, 17 is a roll, 18a and 18b are fluid jet ports, 20a and 20b are buff-full plates, and S is a band plate.

Claims (1)

[Claims] 1. A main body in which a first pressure-receiving surface and a second pressure-receiving surface facing the strip plate are formed directly below the strip plate, and the first and second pressure-receiving surfaces along the threading direction of the strip plate. are opened along the width direction of the strip at both front and rear ends of the strip, and fluid is ejected obliquely upward toward the center of each pressure-receiving surface, thereby creating a gap between the strip and the pressure-receiving surface. a fluid spout that generates a static pressure;
a plurality of buttful plates protruding from each of the first and second pressure-receiving surfaces so as to extend in the threading direction of the strip plate and to be arranged along the width direction of the strip plate; and a roll extending along the width direction of the strip plate at the boundary between the pressure receiving surface and the second pressure receiving surface and protruding upward from the buttful plate so as to be movable up and down. Features a support floater for strip plates.