JP2770528B2 - Strip floating support method and apparatus - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip levitation support method and apparatus for stabilizing the position of a levitated strip and effectively applying fluid to strips having different widths. .

[Prior Art] As shown in FIGS. 8 and 9, a fluid jet nozzle d is extended linearly in the width direction of the strip b and wider than the width of the strip b on the lower surface of the strip b passed through the traveling line a. The floating of the strip b by ejecting a fluid from the fluid ejection nozzle d toward the lower surface of the entire width of the strip b is conventionally performed as disclosed in Japanese Patent Application Laid-Open No. Sho 60-138019.

However, when the strip b is shifted left and right from the center of the traveling line a, the position of the strip b is unstable with respect to the center of the traveling line a because the strip b does not return to the center of the traveling line a from that state. When the narrow strip b is passed through, the fluid ejected from the outer portion of the fluid ejection nozzle d in the width direction of the strip b does not collide with the lower surface of the strip b and diffuses into the air. The support force is reduced. In order to compensate for the decrease in the supporting force, there is a problem that the ejection pressure of the fluid ejected from the fluid ejection nozzle d must be increased.

Therefore, in recent years, Japanese Patent Application Laid-Open No. 62-483 shown in FIGS.
No. 7, the fluid jet nozzles d and d 'for impinging fluid toward both ends in the width direction of the strip b are connected to the traveling line a.
A method is adopted in which the strips b are provided symmetrically with respect to the center and levitated and supported while automatically centering the strip b.

In the above method, when the strip b having a small width is passed through, the fluid ejection nozzle d, d 'is narrowed in the strip c width direction interval c so that the fluid ejection nozzle is positioned at an appropriate position with respect to the strip b width. It is conceivable to make it correspond so as to keep it.

[Problems to be Solved by the Invention] However, in the method of FIGS. 10 and 11 described above, when the interval between the fluid ejection nozzles in the strip width direction is reduced, it is necessary that the inner sides of the fluid ejection nozzles in the strip width direction contact each other. There is a limit. Therefore, there is a great restriction on the movement range of the fluid ejection nozzle corresponding to the increase or decrease of the strip width. When a strip having a width smaller than a certain width is passed, the state in which the fluid ejected from the fluid ejection nozzle hits the lower surface of the strip is shown in FIG. -As in the case of Fig. 9, there is a problem that the strip cannot be automatically centered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a strip floating support method and apparatus which stabilize the position of a levitated strip and effectively apply fluid to strips having different widths. It is.

[Means for Solving the Problems] In the strip levitation support method of the present invention, a pair of fluid ejection nozzles extending in the width direction of the strip are arranged in two directions symmetrical with respect to the center of the traveling line in the width direction of the lower surface of the strip.
By rotating horizontally around the point by the required angle according to the width of the strip, the range of the fluid ejected from the fluid ejection nozzle is set to be almost inside the both width ends of the lower surface of the strip. In this state, the strip is levitated and supported on the fluid ejection nozzle through the strip.In the strip levitating and supporting apparatus of the present invention, a pair of strips extending in the strip width direction at symmetric positions with respect to the center of the running line on the lower surface of the strip. Fluid ejection nozzles are provided, and each fluid ejection nozzle is horizontally positioned at a required angle according to the width of the strip, centering on a pair of spindles provided at right angles to the strip at positions symmetrical with respect to the center of the running line on the lower surface of the strip. By rotating, the area that the fluid ejected from the fluid ejection nozzle hits against both width ends of the lower surface of the strip. URN is a settable provided were configured to be inside.

[Operation] Therefore, in the present invention, since the strip is always supported at at least two points symmetrically about the traveling line, the strip is automatically centered, and the left and right fluid ejection nozzles are individually rotated by different amounts of rotation. Is applied to correct the meandering of the strip, and by appropriately rotating the fluid ejection nozzle, the ejection width of the fluid can be regulated according to the width of the strip.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 to 5 show an embodiment of the present invention.
Rotation driving devices 3a and 3b are arranged at a predetermined distance C and symmetrically with respect to the center 2 of the traveling line, and the rotation driving devices 3a and 3b are connected to worm gears 4a and 4b which rotate horizontally. ,
Worms 5a, 5b meshing with the worm gears 4a, 4b, and drive shafts 6a, 6b connected via a clutch 13 so that the worms 5a, 5b can be individually or integrally rotated. The worms 4a and 4b rotate in opposite directions when the worms 5a and 5b rotate in the same direction.

At the center of the worm gears 4a, 4b, support shafts 7a, 7b vertically extending upward are erected, and further, fluid ejection nozzles 9a, 9b for ejecting fluid in the direction of arrow 8 toward the lower surface of the strip 1.
Extends in the width direction of the strip 1 at the top of the support shafts 7a and 7b. As shown in FIG. 3, each of the fluid ejection nozzles 9a and 9b has an outer end 10 corresponding to the maximum width of the strip 1 to be passed.
Dimension A between a and 10b and inner end 11a and 1
It has a length L with a required interval B between 1b.

When the two portions near the both ends of the strip 1 are levitated and supported, the strip 1 forms a catenary angle α as shown in FIG. 4, and component forces Fa and Fb are generated in the strip 1 toward the center of the strip 1 in the width direction. The component forces Fa and Fb are balanced to give the strip 1 a centering action. Further, for example, when the strip 1 is biased toward the fluid ejection nozzle 9a, the amount of ejected fluid received by the portion of the strip 1 remaining on the fluid ejection nozzle 9b decreases, so that the floating support force decreases, and the strip 1 remains on the ejection nozzle 9b. Since the portion of the strip 1 becomes lower in position, the balance between the component forces Fa and Fb is broken, and the component force Fa on the fluid ejection nozzle 9a side becomes larger, and the strip 1 is pushed back to the fluid ejection nozzle 9b side. Also narrow strip 1
When passing through the plate, the rotary driving devices 3a and 3b are operated to rotate the respective fluid ejection nozzles 9a and 9b in the strip traveling direction (the direction of the arrow D in FIG. 2) about the support shafts 7a and 7b. As a result, the dimension A is appropriately reduced and changed to a required width as a dimension A 'shown in FIG.

In addition, it is preferable that the fluid jetting direction is appropriately inclined to the strip running direction because the centering action of the strip is enhanced when the fluid jetting nozzle is rotated.

It should be noted that the present invention is not limited to only the above-described embodiment, and that the fluid ejection nozzles 9a and 9b have an ejection port 12 for ejecting a fluid in a loop as shown in FIGS. 6 and 7. That the fluid ejection nozzles may be arranged at two or more points in the strip width direction,
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[Effects of the Invention] As described above, according to the strip floating support method and apparatus of the present invention, various excellent effects as described below can be obtained.

Since the fluid ejection width can be easily changed in accordance with different strip plate widths, (I) the centering action can be reliably applied to strips of any width to stabilize the running state of the strips.

(II) Fluid can be effectively used for strips of any width, which is advantageous for transporting strips having different widths and thicknesses.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a method and apparatus for supporting and floating a strip according to the present invention, FIG. 2 is a plan view of the embodiment of FIG. 1, and FIG. 3 is a view taken along the line III-III of FIG. 4 and 5 are action diagrams relating to the embodiment of FIG. 1, FIG. 6 is a plan view showing another example of the fluid ejection nozzle, and FIG. 7 is VI of FIG.
I-VII view, FIG. 8 is an example of a conventional strip levitation support method, FIG. 9 is a plan view of FIG. 8, FIG. 10 is another example of a conventional strip levitation support method, FIG. The figure is a plan view of FIG. In the figure, 1 is a strip, 2 is a running line center, 3a and 3b are rotary drive devices, 7a and 7b are support shafts, 9a and 9b are fluid ejection nozzles,
10a and 10b denote outer ends, 11a and 11b denote inner ends, and A denotes a width dimension.

Continued on the front page (72) Inventor Tomotoshi Mochizuki 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside Ishikawajima-Harima Heavy Industries Co., Ltd. No. 1 Ishikawajima-Harima Heavy Industries Co., Ltd. Yokohama No. 2 Factory (56) References JP-A-62-235429 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C21D 9/63 B65H 20 / 10,20 / 14

Claims (2)

(57) [Claims] In a strip floating support method for ejecting a fluid from a fluid ejection nozzle to a lower surface of a traveling strip to float the strip, a pair of fluid ejection nozzles extending in a width direction of the strip are provided in a width direction of the lower surface of the strip and in a traveling line. By rotating horizontally about the two points symmetrical with respect to the center by the required angle according to the width of the strip, the range of the fluid ejected from the fluid ejection nozzle is adjusted to both width ends of the lower surface of the strip. A strip floating support method, wherein the strip floating support is set so as to be substantially inside, and in this state, the strip is floated and supported on the fluid ejection nozzle through the strip. 2. A strip levitation support device for ejecting a fluid toward a running lower surface of a strip to levitate a strip, comprising a pair of fluid jetting nozzles extending in a strip width direction at positions symmetrical with respect to a center of a running line on the lower surface of the strip. Then, the fluid jet nozzles are horizontally rotated by a required angle according to the width of the strip around a pair of support shafts provided at right angles to the strip at positions symmetrical with respect to the center of the traveling line on the lower surface of the strip, thereby obtaining fluid. A strip levitation support device characterized in that the range of the fluid ejected from the ejection nozzle is set so as to be substantially inward with respect to both width ends of the lower surface of the strip.