JPH0718751Y2 - Shutter with side fence for floater nozzle - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter with a side fence, which is located on both sides of a transport strip and which controls the air ejection width of a floater nozzle in a floater for continuous heat treatment of metal strips.

[0002]

2. Description of the Related Art Conventionally, as a floater, as shown in FIG. 7, a floater nozzle 11 that blows air to the bottom surface of a continuously conveyed strip S to levitate it and a strip S are sandwiched between them. There is known one provided with a shutter 13 with a side fence 14 that moves forward and backward on the floater nozzle 11. In the floater 10,
Strip S from the air ejection hole 12 of the floater nozzle 11.
Air is blown to the lower surface of the strip S to keep the strip S floating. Further, the shutter 13 closes the air ejection hole 12 according to the width of the strip S to adjust the air ejection width of the floater nozzle 11, and at the same time, the side fence 14 discharges the air ejected from the gaps G, G ′ at the end of the strip S. Blocking enhances the levitation effect of the strip S.

[0003]

However, if the strip S is deformed such as C warp, reverse warp, ear extension, middle extension, etc., the strip support pressure on the nozzle face (strip levitation support surface) becomes unbalanced on the left and right. Then, as shown by the solid line and the alternate long and short dash line, the rolling of the strip S occurs. In addition, when the gaps G and G ′ are different due to the rolling, the pressure imbalance is further increased, which promotes the rolling and the strip S collides with the side fence 14 and is damaged. Was.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned problems, and in a floater for continuous heat treatment of metal strips, the metal strips are arranged on both sides of a transport strip so as to be movable back and forth toward the strip. A side fence is rotatably held by a shaft that is parallel to the strip transport direction in a shutter that adjusts the air ejection width of a floater nozzle that blows air onto the lower surface of the strip.

[0005]

According to the above shutter with side fence, when the strip rolls, the side fence having a narrow gap with the strip swings in the direction opposite to the strip to reduce the pressure increase, and Decrease the rolling force.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a part of the floater 1,
The floater nozzle 2 has a strip S transport direction (arrow X
Direction) (the direction of arrow Y) and the air ejection holes 3,
3'is formed, and the air supplied from the blower device (not shown) to the floater nozzle 2 is blown to the lower surface of the strip S via the air ejection holes 3 and 3 '. On both sides of the strip S, there are two sets of shutters 4 and 4'which move along the air ejection holes 3 and 3'while closing them.
Are provided facing each other. Further, side fences 5 arranged in the arrow Y direction are swingably held by shafts 6 and 6 at front and rear ends of front and rear shutters 4 and 4 ′ (upper and lower in FIG. 1). Further, the side fence 5 has a mechanism that does not swing toward the strip due to the stopper 51.

In the floater 1, the shutters 4 and 4'are moved back and forth in the direction of the arrow Y by a driving device (not shown), and the side fences 5 are set at positions facing both ends of the strip S with a predetermined gap G therebetween. At the same time, the widths of the air ejection holes 3 and 3'are adjusted by the shutters 4 and 4 '.

Air is supplied to the floater nozzle 2 from an air blower (not shown). The supplied air is ejected from the air ejection holes 3 and 3'and is blown to the lower surface of the strip S, so that the strip S is kept in a floating state. Also,
The air blown to the strip S moves laterally on the lower surface of the strip S, is blocked by the side fences 5 and 5, and is then discharged from the gaps G and G.

When the strip S is deformed such as C-warp, the levitation force of the strip S is different between the left and right, and the strip S rolls. As a result, the width of the left and right gaps G, G changes. That is, as shown in FIG.
One of the gaps G (G ') becomes narrower and the other gap G (G'') becomes wider. Further, when the gap G becomes narrower and the strip levitation pressure tends to increase, the side fence 5 swings outward in accordance with the pressure increase amount, and the narrowed gap G (G ′) is expanded. As a result, the increase in levitation pressure is reduced, and the rolling force of the strip S is reduced. Therefore, the rolling of the strip S is eliminated at a small number of stages without expanding.

4 and 5 show a second embodiment of the shutter and the side fence. The shutters 4a, 4a 'before and after holding the side fence 5a are connected by a gate-shaped connecting portion 44a, and these shutters 4a, 4a' are shown. A water cooling pipe 7a is built in the connecting portion 44a. In addition, the connecting portion 4
4a has a J-shaped hook 8a attached to the bottom,
A side fence 5a made of a composite material of heat-resistant steel or ceramics is swingably locked to the hook 8a via a shaft 6a. In this embodiment, the shutters 4a,
4a 'and the connection part 44a are cooled by the cooling water supplied to the water cooling pipe 7a. In addition, as in the above-described embodiment, the side fence 5 responds to the rolling of the strip S.
a operates and the rolling of the strip S is eliminated.

FIG. 6 shows a third embodiment of a shutter and a side fence. Bearing grooves 9b and 9b are formed in the upper surface of the tip of the shutter 4b, and side fences 5b and 5b are formed therein.
The shafts 6b and 6b of b are locked. Therefore, the side fences 5b and 5b can be easily removed, and maintenance and inspection is easy. Further, in this embodiment, since the side fences 5b and 5b are provided in double, the strip S
The amount of air that escapes from under the side fences 5b, 5b can be finely adjusted according to the levitation pressure.

[0012]

As is apparent from the above description, in the shutter with a side fence of the floater nozzle according to the present invention, the side fence is rotatably held by an axis parallel to the strip, so that the strip sways. Due to this, the side fence whose gap is narrowed swings outward due to an increase in strip levitation pressure, and expands the gap with the strip to reduce the levitation pressure. Therefore, rolling of the strip is reduced, and rolling is eliminated at a small stage. Therefore, the strip does not collide with the side fence and is not damaged, and it is possible to obtain a good quality product with no flaws.

[Brief description of drawings]

FIG. 1 is a plan view of a floater nozzle and a shutter with a side fence.

FIG. 2 is a side view of a floater nozzle and a shutter with a side fence.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view of a shutter with a side fence according to a second embodiment.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a partial perspective view of a shutter with a side fence according to a third embodiment.

FIG. 7 is a side view of a conventional shutter with a side fence.

[Explanation of symbols]

1 ... Floater, 2 ... Floater nozzle, 3 ... Air ejection hole,
4 ... Shutter, 5 ... Side fence, 6 ... Axis.

Claims (1)

[Scope of utility model registration request] 1. In a floater for continuous heat treatment of a metal strip, a shutter is provided on both sides of a transport strip so as to be able to move forward and backward toward the strip, and a shutter for adjusting the air ejection width of a floater nozzle for blowing air to the lower surface of the strip, the strip. A shutter with a side fence for a floater nozzle, characterized in that the side fence is rotatably held by an axis parallel to the transport direction.