JPH072396A - Steel belt floating conveying device - Google Patents

Abstract

PURPOSE:To prevent the dropping of a steel belt edge between stream fairing plates by providing a pressure receiving face having stream fairing plates directly below a steel belt, two nozzles provided over the whole width of the steel belt at the positions across the pressure receiving face longitudinally, and the stream fairing plates installed at an angle to the advance direction of the steel belt. CONSTITUTION:Stream fairing plates 1 are arranged in an inverted V-shape relative to the advance direction of a steel belt on a pressure receiving face 4 in the width direction of the steel belt conveyed in the direction of an arrow. Nozzles 2 for spraying gas or a liquid to the steel belt over the whole width of the steel belt to float it are arranged at both end sections of the stream fairing plates 1. The angle theta of the stream fairing plate 1 relative to the advance direction of the steel belt is set within a range of about 10-45 deg., thereby the suppression of the outflow of a fluid to the side and the prevention of the dropping of the steel belt between the stream fairing plates 1 are both satisfied. The stream fairing plates 1 are preferably installed to satisfy the expression Ltantheta>=d, where (d) is the distance between the fairing plates 1, and L is the length of the installation face for the fairing plates 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to floating and transporting a steel strip by spraying a gas or a liquid from a nozzle onto the steel strip, and a floating transport of a steel strip provided with a straightening plate for stably floating the steel strip. Regarding the device.

[0002]

2. Description of the Related Art In recent years, the demand for high-quality steel strips has increased the demand for manufacturing defect-free products. Prevention of indentation has been an urgent issue for quality improvement. Therefore, from the first half of the 1980s, a steel strip levitation transport device (hereinafter referred to as a floater), which transports steel strip while supporting it in a non-contact manner, was developed as a transport device to replace rolls, and many actual machines are in operation.

A floater is one in which gas or liquid is sprayed from a nozzle onto a steel strip to float the steel strip by the static pressure generated between the steel strip and the floater.

[0004]

However, since the frictional resistance between the steel strip and the fluid is small and the fluid flows out a lot from the side surface of the steel strip in the transportation by the floater described above, the steel strip is caused by a small disturbance. Was caused to tilt in the width direction and skewed, and the floating of the steel strip was extremely unstable. Therefore, as a measure for stabilizing the floating of the steel strip, in Japanese Examined Patent Publication No. 5-20342, the straightening plate 1 is arranged on the pressure receiving surface 4 in parallel with the traveling direction of the steel strip indicated by the arrow as shown in FIG. 4 (a). A method for preventing the fluid from flowing out to the side surface by the straightening plate and making the flow uniform is disclosed and put to practical use, which realizes a stable floating of the steel strip.

Nozzles 2 for blowing gas and liquid onto the steel strip 3 to float the steel strip 3 are provided at both ends of the current plate 1. As shown in FIG. The arrow cross section is shown. However, in this method, when the steel strip to be conveyed is curved as shown in the sectional view of the steel strip levitation conveying device cut at a right angle to the traveling direction of the steel strip in FIG. There is a problem that the steel strip edge is damaged, and in the worst case, the plate breaks, resulting in a very large downtime.

It is an object of the present invention to provide a steel strip levitation transportation device which solves the above problems.

[0007]

According to the present invention, there is provided a pressure-receiving surface immediately below a steel strip facing the steel strip, and two nozzles at right angles to the traveling direction of the steel strip and over the entire width of the steel strip. An apparatus for levitating and transporting a steel strip composed of a straightening vane provided on a pressure receiving surface between two nozzles, wherein the straightening vane is installed at an angle with respect to the traveling direction of the steel strip. It is a belt levitation transport device.

[0008]

[Operation] According to the present invention, a pressure receiving surface immediately below the steel strip and facing the steel strip, two nozzles perpendicular to the traveling direction of the steel strip and extending over the entire width of the steel strip, and two nozzles In a device for levitating and transporting a steel strip consisting of a straightening plate provided on the pressure receiving surface between the nozzles, the straightening plate is installed at an angle with respect to the traveling direction of the steel strip. The liquid from is efficiently sprayed, the edges of the curved steel strip do not fall between the straightening plates, and troubles such as steel strip breakage are eliminated.

The angle is preferably in the range of about 10 to 45 degrees so as to satisfy both the suppression of the outflow of the fluid to the side surface and the prevention of the fall of the steel strip edge between the straightening vanes. Also,
The angle θ between the straightening vane and the traveling direction of the steel strip and the distance d between the straightening vanes
The relationship with and is as shown in equation (1) below. Ltan θ ≧ d (1) L: Length of straightening plate installation surface d: Distance between straightening plates θ: Angle between straightening plate and traveling direction of steel strip

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment in which the current plate 1 is arranged in an inverted V shape with respect to the traveling direction of the steel strip.
(b) is a sectional view taken along the line AA of (a). Note that FIG.
In the embodiment of FIGS. 2 and 3, the angle θ = 15 with the traveling direction of the steel strip.
The length L of the rectifying plate 1 was 500 mm and the distance between the rectifying plates 1 was d = 20 mm.

In the embodiment according to the present invention, it is possible to obtain the same floating stability as that of a conventional floater having a current plate parallel to the steel strip, and also to obtain the floating stability of a steel strip having a bad shape. The steel strip edge no longer falls between the straightening vanes 1. FIG. 2 is a plan view showing another embodiment in which the straightening vanes 1 are arranged in a V shape in the traveling direction of the steel strip, and this embodiment also obtained the same results as the other embodiments.

FIG. 3 is a plan view showing an embodiment in which the front half of the straightening vane 1 is arranged in a V shape and the rear half is arranged in an inverted V shape with respect to the traveling direction of the steel strip. Results similar to those of the other examples were obtained.

[0013]

According to the apparatus of the present invention, the trouble that the edge of the steel strip falls into the gap between the straightening vanes can be eliminated without impairing the stable floating property of the steel strip. It is possible to stably float and convey.

[Brief description of drawings]

FIG. 1A is a plan view showing an embodiment in which a current plate is arranged in an inverted V shape. (b) It is an AA arrow sectional drawing of (a).

FIG. 2 is a plan view showing an embodiment in which a current plate is arranged in a V shape.

FIG. 3 is a plan view showing an embodiment in which the front half of the current plate is arranged in a V shape and the rear half is arranged in an inverted V shape.

FIG. 4 (a) is a plan view showing a floater having a conventional current plate. (b) It is an AA arrow sectional drawing of (a).

FIG. 5 is a cross-sectional view showing a steel strip levitation transport device cut at a right angle to the traveling direction of the steel strip.

[Explanation of symbols]

 1 Straightening plate 2 Floater nozzle 3 Steel strip 4 Pressure receiving surface

Claims (1)

[Claims] 1. A pressure receiving surface immediately below the steel strip, which faces the steel strip, two nozzles at right angles to the traveling direction of the steel strip and over the entire width of the steel strip, and a pressure receiving between the two nozzles. A device for floating and transporting a steel strip comprising a straightening plate provided on a surface, wherein the straightening plate is installed at an angle with respect to the traveling direction of the steel strip.