JPH0520342B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a support floater for a strip that supports a running strip in a non-contact manner using fluid pressure in a continuous annealing line, a continuous plating line, etc. for steel plates. It is related to.

<Prior art> Conventionally, 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 usually used. However, when performing surface treatment on strips, a non-contact type strip support floater is used that applies the principle of a hovercraft, and its cross-sectional side view is shown in Figure 3, and the plan view in Figure 3 is shown. Fourth
As shown in the figure. As shown in FIGS. 3 and 4, the main body 2 of the box-shaped strip support floater, whose interior is a plenum chamber 3 for fluid such as air, has a smooth pressure-receiving surface 4 facing the strip 1. Nozzles 5, which are two fluid ejection ports extending in the width direction of the plate and facing each other, are installed at both ends of the pressure receiving surface 4. Gas such as air is supplied from the gas inlet duct 10 and ejected from the nozzle 5, forming a reverse flow between the strip 1 and the pressure receiving surface 4 as shown by the arrow in Fig. 3, and applying pressure according to the hovercraft principle. This is to support the strip 1 in a non-contact manner. The actual installation situation is shown in the fifth section.
As shown in the figure.

<Problems to be Solved by the Invention> As shown in FIG. 5, when the installation pitch L of the strip support floater is constant, once the thickness of the strip 1 is determined, the distance l( 3) is as wide as possible, the pressure to be generated on the pressure receiving surface 4 is low, and therefore the amount of air supplied to the floater can be small, and the pressure in the plenum chamber 3 can also be low. However, when floating a strip 1 with a narrow plate width using the same floater, as shown by the dotted line in Fig. 4, from the opening formed by the edge of the plate width and the pressure receiving surface 4, which has less resistance than the reverse flow. Gas escapes easily, and as a result, the direction in which gas escapes in the width direction of the floater alternately changes to the direction perpendicular to the running direction, and the strip plate on the floater vibrates in the width direction, so-called rolling, and comes into contact with the pressure receiving surface 4. In some cases, an unstable floating situation occurred in which the strip plate partially stuck to a part of the floater body 2. Therefore, there was a problem in that it was not possible to process from the wide strip 1 to the narrow strip 1 with the same floater.

<Means for solving the problems> In order to solve the above problems, the configuration of the present invention is as follows.
A main body having a smooth pressure-receiving surface facing the strip plate formed directly below the strip plate, the front and rear ends of the pressure-receiving surface along the threading direction of the strip plate, respectively along the width direction of the strip plate. A strip plate having a set of fluid ejection ports that are open and eject fluid obliquely upward toward the center of the pressure receiving surface to generate pressure of the fluid between the strip plate and the pressure receiving surface. In the supporting floater, a plurality of fluid jet ports are provided between the pressure receiving surface, facing the fluid jet port and opening diagonally upward and along the plate width direction, and a band is provided on the pressure receiving surface. It is characterized by protruding ribs that extend parallel to the running direction of the board and are lined up in multiple rows in the width direction of the board.

<Function> With the above configuration, pressure is generated from each fluid jet port, and the ribs prevent gas from escaping in the board width direction.
The strip will float stably on the floater even under a wide range of plate conditions from wide to narrow.

<Examples> Examples of the present invention will be described below based on the accompanying drawings.

In Figures 1 and 2, 1 is a strip;
2 is the main body of the strip support floater, 3 is a plenum chamber, 4 is a pressure receiving surface, 5 is a nozzle which is a fluid ejection port, and 10 is a gas inlet duct. In the figure, the two nozzles 5 provided inwardly face each other with the nozzle 5 at the end of the pressure receiving surface. Although the number of nozzles 5 is four, it is not necessary to limit the number to four, and there may be a large number of nozzles. Moreover, these nozzles 5 share the plenum chamber 3,
When the nozzles 5 are viewed in groups, such as groups A and B in FIG. 1, the plenum chambers 3 may be independent for each group.

In this embodiment, a plurality of ribs 7 extending in the traveling direction of the plate are provided on the pressure receiving surfaces of the opposing nozzle sets A and B. By providing this rib 7, flow resistance in the plate width direction is increased, and gas leakage from between the width direction edge of the plate and the pressure receiving surface can be reduced. Therefore, of the jet flow from the nozzle 5, the flow rate that becomes a reverse flow under the plate increases, so that the levitation force increases. Moreover, any rolling on the floater can be prevented since the amount of leakage in the plate width direction can be reduced.

<Effects of the Invention> As described above, according to the present invention, the strip can be stably floated, the air volume can be reduced, and the strip width processing range can be widened. .

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view of one embodiment, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a cross-sectional side view of a conventional example, Fig. 4 is a plan view of Fig. 3, and Fig. 5 FIG. 2 is a conceptual diagram of a mechanism showing a general arrangement of a support floater for a strip. Further, in the figures, 1 is a strip, 2 is a main body, 3 is a plenum chamber, 4 is a pressure receiving surface, 5 is a nozzle, 7 is a rib, and 10 is a gas inlet duct.

Claims (1)

[Claims] 1. A main body having a smooth pressure-receiving surface facing the strip plate formed directly below the strip plate, 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 band provided with a set of fluid ejection ports each of which is open and ejects fluid diagonally upward toward the center of the pressure receiving surface to generate pressure of the fluid between the band plate and the pressure receiving surface. In the support floater for a plate, a plurality of fluid jet ports are provided between the pressure receiving surface, facing the fluid jet port and opening diagonally upward and along the board width direction, and on the pressure receiving surface, A support floater for a strip that has protruding ribs extending parallel to the running direction of the strip and arranged in multiple rows in the width direction of the strip.