JPH0463130B2 - - 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 by rollers as necessary and can also support the float in a non-contact manner using the static pressure of a fluid.

<Prior art> In a continuous annealing line or a continuous plating line for strips such as steel plates, or a continuous electrolytic degreasing line or a continuous pickling line that precedes these lines, a guide device is required to guide the running of the strip. A guide roll is used. However, for example, in a continuous annealing line, 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 used that supports and guides the strip from below in a non-contact manner using the pressure of a _H2 - _N2 mixed gas, for example, by applying the principle of a hydrostatic bearing. It is used.

The support floater 1 has an internal structure as shown in FIG. 5 showing its appearance and FIG. 6 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> Since the pressure-receiving surface 4 of the support floater 1 as described above is smooth, the fluid ejected from the fluid jet port 7 is forced between the pressure-receiving surface 4 and the strip 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. 7, 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. 8, 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 S becomes difficult to flow in the width direction of the strip S by the baffle plate 8, the leakage flow rate decreases, and the supporting force of the fluid becomes as shown in FIG. 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 pressure-receiving surface facing the strip is formed directly below the strip;
Openings are made along the width direction of the strip at both front and rear ends of the pressure-receiving surface along the threading direction of the strip, and fluid is ejected obliquely upward toward the center of the pressure-receiving surface. a set of fluid jet ports that generate static pressure of the fluid between the strip plate and the pressure receiving surface; and a roll provided along the width direction of the strip plate so as to be able to protrude upwardly from the buttful plates on the pressure receiving surface. Features.

<Operation> 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 spout. On the other hand, in special cases such as threading, a roll is made to protrude above the baffle plate, and the strip is supported by this roll in contact with it.

<Example> Hereinafter, an example of the present invention will be described 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, an upper plate 15 having a pressure receiving surface 14 facing the strip S is integrally attached to a box-shaped main body 12 whose interior is a chamber 11 for a fluid such as H ₂ - _{N 2} mixed gas. It is being A recess 16 extending in the width direction of the strip S is formed in the center of the upper plate 15, and a roll 17 extending in the width direction of the strip S is placed in the recess 16 to form a buttful, which will be described later. It is provided so as to be movable in the vertical direction in FIG. 1 so as to protrude upward from the upper end of the plate 20. Further, between the front and rear ends of the upper plate 15 in the strip S passing direction (left and right direction in FIG. 2) and the main body 12, the fluid sent into the chamber 11 is directed toward the center of the pressure receiving surface 14. Slit-shaped fluid ejection ports 18 are formed to eject the fluid obliquely, and the inside of the chamber 11 is connected to a fluid supply source (not shown) via a pipe 19 that is continuous with the main body 12 . In this embodiment, the fluid jet ports 18 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 S.

On the pressure-receiving surface 14, a plurality of buttful plates 20 (in this embodiment, a total of 4 sets including the front and rear plates separated by the recess 16) extending in the direction of strip S are attached to the strip S. They are arranged in a protruding manner along the width direction, and the upper edge of the buttful plate 20 is connected to the band plate S.
It is formed into an arc shape along the deformation due to its own weight.

Therefore, when the roll 17 is lowered by a known elevating mechanism (not shown) and positioned below the upper end of the baffle plate 20 as shown in FIG. 1b, the fluid supply source is When the fluid sent into the chamber 11 through the piping 19 is blown out from the fluid jet port 18 into the gap between the pressure receiving surface 14 and the strip S, this fluid flows in the width direction of the strip S due to the presence of the full plate 20. Therefore, the strip S is supported floating in a non-contact state by the static pressure of the high-pressure fluid. On the other hand, the roll 17 is raised by the elevating mechanism, and as shown in FIG.
When the roll 17 is placed in a position protruding upward from the upper end of the strip S and rotated at the same speed as the threading speed of the strip S by a motor (not shown), the roll 17 can be used for threading, etc. The strip S can be supported in contact.
In addition, when supporting the strip S with the rolls 17 in this way, it is not necessary to eject fluid from the fluid ejection ports 18 or not, and whether or not to use static pressure support using fluid at the same time depends on various conditions. To be determined accordingly.

3 and 4 relate to another embodiment of the present invention, FIGS. 3a and 3b are side views of the strip support floater in a contact support state and a non-contact support state, respectively, and FIG. It is a top view of a support floater for plates. It should be noted that the same reference numerals are given to parts that are substantially the same as those in the above-described embodiment, and redundant explanation will be omitted.

As shown in the figure, in this embodiment, the roll 17
A disk 21 is provided at each end of the main body 12, and these disks 21 are positioned with a small gap from both left and right end walls of the main body 12.

Therefore, when the band plate S is floated and supported by the fluid ejected from the fluid ejection port 18, the outflow of the fluid flowing along the roll 17 at the center of the pressure receiving surface 14 where the buff-full plate 20 is divided is caused by the disc. 2
1, and the supporting force of the fluid can be effectively applied.

<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 uniform action can be applied, 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, which is advantageous in terms of power and expands the versatility of the strip support floater.

[Brief explanation of drawings]

Figures 1a, b and 2 relate to an embodiment of the present invention, in which Figures 1a and b are side views of the strip supporting floater, Figure 2 is a plan view thereof, and Figures 3a, b,
FIG. 4 relates to another embodiment of the present invention, and FIGS. 3a and 3b are side views of a strip support floater, respectively;
FIG. 4 is a plan view thereof, FIG. 5 is a perspective view showing an example of a conventional strip supporting floater, FIG. 6 is a sectional view showing its internal structure, and FIG. 7 is a graph showing its static pressure distribution. FIG. 8 is a perspective view showing another example of a conventional support floater for a strip, and FIG. 9 is a graph showing its static pressure distribution. In the drawings, 12 is a main body, 14 is a pressure receiving surface, 17 is a roll, 18 is a fluid ejection port, 20 is a baffle plate, 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. a set of fluid ejection ports each spouting fluid obliquely upward toward the center side of the pressure receiving surface to generate static pressure of the fluid between the strip plate and the pressure receiving surface; and the strip plate. a plurality of buttful plates protruding from the pressure-receiving surface so as to extend in the strip-threading direction and being arranged along the width direction of the strip; A support floater for a strip plate, comprising a roll provided along the width direction of the strip plate so as to obtain the width of the strip plate.