JPH0432449A - Band plate travel direction changing gas supporting device - Google Patents

Abstract

PURPOSE:To allow a band plate to travel without meandering by providing the protruding top part of a gas pad face with a pair of V-slits formed in such a way that the V-bottom thereof disposed outside both width end parts of the band plate faces outward, and also with a pair of seal plates disposed outside the V-slits in such a way as to be parallel to the travel direction of the band plate and approximately right-angled to the arcuate face. CONSTITUTION:When a band plate 1 is shifted in the direction of an arrow mark 11, the whole V-nozzle 3 including its bottom 3-1 is covered with the band plate 1, whereas a V-nozzle 3' comes off the band plate 1, and only the V-end part 3'-2 of a V-groove is covered with the band plate 1. The band plate 1 on the V-nozzle 3 side is thereby lifted largely upward by the gas flow blown off upward from the V-groove 3-1, whereas the band plate 1 on the V-nozzle 3' side is slightly swollen in the lateral direction by the gas flow blown off from the V-end part 3'-2 but its upward lifting does not take place. As a result, the band plate 1 is inclined on a gas pad face 2, but is moved in the direction of an arrow mark 12 by the partial force P' of gravity P acting upon the band plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] For example, in a vertical steel strip heat treatment furnace, the steel strip is raised and then lowered, or lowered and then raised and run.

The present invention relates to a gas support device for changing the running direction of a strip, which is used when supporting this steel strip using a gas cushion, for example.

[Prior Art] In a typical vertical annealing furnace for steel strips, the steel strip is supported by passing between rolls disposed at the top and bottom of the furnace, and the steel strip is caused to travel by changing its direction. However, this method has problems in that the steel strip tends to be scratched because the rolls rub against it, and the running path of the steel strip tends to meander.

JP-A No. 63-176435 discloses a strip flotation device for conveying the strip in a non-contact manner, although it is not for changing the running direction, and is characterized in that a substantially upright side plate is installed on the side of the strip movement line. . Although details are not described in this publication, Figures 5 (A) and (B) are examples in which this side plate is used as a gas support device for direction change.
(CB) is a side view, and (CB) is a front view. In this method, the side plate 40
(40') is provided to prevent the strip from meandering, but as will be described later, if the side plate 40 (40') is provided without any special measures, the strip 1
contact with the side plate, making it difficult for the strip to run or causing surface flaws on the strip.

JP-A-60-138019 is not a device for changing direction, but relates to a floater nozzle for conveying strips in a non-contact manner. In this method, a 7-shaped slit is provided in the width direction in order to float the width end of the strip l. However, as shown in Figure 5(C), this V-shaped slit is a slit formed with the V-bottom facing toward the center of the width of the strip, so it is used for changing the running direction of the strip as described later. However, it is not possible to prevent the strip from meandering.

Also, although it is not mentioned in the prior art, for example, in a vertical heat treatment furnace for steel strips, the rolled steel strips are passed through the steel strips without shape correction, but the steel strips that have not been shape-corrected have an ear wave. Conventional gas support devices for changing direction have a problem in that the gas support device comes into contact with the ear waves and mid-stretches, causing flaws.

[Problems to be Solved by the Invention] The present invention is a gas support device for changing the running direction of a strip that travels by going up and then going down, or going up and down after going down. The object of the present invention is to provide a gas support device that does not run with a ridge and is capable of supporting a band plate having an ear wave or an elongation in a non-contact manner.

[Means for Solving the Problems] FIG. 1 shows an example of the gas support device of the present invention, in which (A) is a perspective explanatory view and (B) is a developed view of the gas pad surface. The present invention is a gas support device for changing the traveling direction of a strip 1 that travels in the direction of arrow 6, for example, by ascending and then descending. The gas support device 7 is a semicylindrical gas box having a convex arcuate gas pad surface 2.

The high-pressure gas is introduced into the gas support device 7 from, for example, a gas introduction hole 8 provided at the lower part, and is blown onto the strip plate 1 from a floating gas ejection slit 9 provided on the gas pad surface 2. The strip plate 1 is caused by the gas ejected from the floating gas ejection slit 9.
It is supported on the gas pad surface 2 via the gas pad.

The gas pad surface 2 of the present invention is provided with V-shaped slits 3, 3' at the top of the convex arc surface. The V-shaped slits 3 and 3' are V-shaped slits 3 and 3'.
The bottom 3-1.3'-1 is arranged outside both ends of the width of the strip 1, and the bottom 3-1.3'-1 is formed to face the outside of the width of the strip 1. . ■The distance from the bottom 3-1 (3'-1) to the edge of the width of the strip plate 1 is not particularly limited, but the strip should be approximately 1/3 to 1/2 of the length of each side of the V-shape. It is preferable to provide it so as to deviate from the width direction of the plate 1.

In FIG. 1, the floating gas jetting slit 9 is shown as an example of a rectangular shaped slit, but the shape and arrangement of the floating gas jetting slit 9 may be other known shapes.

A pair of seal plates 4, 4' are further provided on the top of the gas pad surface 2 of the present invention. The seal plates 4, 4' are provided parallel to the running direction 6 of the strip plate 1 and substantially perpendicular to the arc surface, and on the outside of the V bottom 3-1.3'-1 of the V-shaped slit. Seal plate 4, 4
' is provided at the top of the arc surface at an elevation angle of 30 to 70 degrees. When the seal plates 4, 4' are provided over the entire length of the arc surface, as will be described later, the wide ends of the strip plate 1 come into contact with the seal plates 4, 4', and the smooth running of the strip plate 1 is prevented. This also causes scratches on the strip 1. The height of the seal plate 4.degree. 4' is not particularly limited, but can be set to 30 to 50 cm.

Further, it is desirable that the interval between the seal plates 4 and 41 be 20 to 60 cm wider than the width of the strip plate 1.

The gas pad surface 2 of the present invention is further provided with horizontal slit-shaped guide nozzles 5, 5' at the inlet and outlet ends of the strip plate 1 (near the lower end of the convex arc surface of the gas pad surface). Guide nozzle 5,5
Although the length of ' is not particularly limited, a length that is approximately the same as the width of the strip plate 1 can be used.

In FIG. 1(C), in the present invention, the amount of gas ejected from the guide nozzles 5, 5' is adjusted in accordance with the degree of wave and middle elongation of the strip, as will be described later. Therefore, in the present invention, the V-shaped slits 3, 3
' and the gas ejected from the levitation gas ejection slit 9,
Although a common gas introduction hole 8-1 can be used, the gas ejected from the guide nozzles 5 and 5' can be introduced from a separately provided gas introduction hole 8-2, and a partition wall 10 is provided in the gas support device. The structure is such that the amount of gas ejected from the guide nozzles 5° and 5' can be independently controlled.

[Function] In the present invention, the V-shaped slit prevents the strip plate 1 from meandering. Figure 2 is an explanatory diagram of its action, (A) is a plan explanatory diagram;
(B-1) is a side explanatory view of the V-shaped slit 3 side, (B-2
) is an explanatory side view of the V-shaped slit 3' side, and (C) is an explanatory front view. An example will be explained in which the band plate 1 is shifted in the direction of the arrow 11 in FIG. 2(A) due to, for example, non-uniform plate thickness or curling. When the strip plate 1 shifts in the direction of the arrow 11, the entire V-shaped nozzle 3 including the V bottom 3-1 is covered by the strip plate 1.

On the other hand, the V-shaped nozzle 3' is removed from the strip plate 1 and the V-shaped nozzle 3' is removed from the V-shaped end 3 of the V-groove.
'-2 is covered by the strip 1. Therefore, the strip plate 1 on the V-shaped nozzle 3 side has ■grooves 3-1 as shown in FIG. 2 (B-1).
The gas flow blown upward from the wall lifts the object upwards.

On the other hand, as shown in Figure 2 (B-2), the strip plate on the V-shaped nozzle 3' side swells slightly laterally due to the gas flow blown out from 3'-2, but is not lifted upward. The plate 1 is tilted on the gas pad surface 2 as shown in FIG. 2(C), but the strip plate 1 moves in the direction of arrow 12 due to the component force P' of the gravity P acting on the strip plate 1. .

As described above, even if the strip 1 shifts in the direction of the arrow 11 due to, for example, non-uniform thickness or curling, the strip 1 will naturally return to the direction of the arrow 12. Therefore V$3 and 3'
This naturally prevents the strip plate 1 from meandering.

In the present invention, the seal plate prevents the strip from meandering. For example, due to uneven thickness or curling of the strip 1, the third
An example of deviation in the direction of arrow 11 in FIG. Band plate 1
deviates in the direction of arrow 11, gap 1 between seal plate 4 and band plate 1
3 becomes smaller, and the gap 13' between the seal plate 4' and the strip plate 1 becomes larger. Gas is ejected from the floating gas ejection slit 9, and pressure is created between the strip plate 1 and the gas pad surface 2. However, since the gas is difficult to flow out from the small gap 13, the gas is ejected from the sealing plate 4 side. The pressure of the gas pad increases and lifts the strip 1 upwards. On the other hand, since gas easily flows out from the seal plate 4' side, the pressure of the gas pad is small and the strip plate 1 is not lifted upward. For this reason, the strip plate 1 is
), the strip plate 1 is inclined on the gas pad surface 2, but due to the component force P' of the gravity P acting on the strip plate 1, the strip plate 1 moves in the direction of the arrow 12. Even if the plate 1 shifts in the direction of the arrow 11 due to, for example, uneven thickness or curling, the strip l will naturally return to the direction of the arrow 12. Therefore, the seal plates 4 and 4' naturally prevent the strip 1 from meandering.

FIG. 3 (C-1) is a comparative example in which seal plates 4, 4' are provided over the entire length of the arc surface. At this time, since the gap 13 is small and the strip plate 1 is inclined, the width end of the strip plate 1 comes into contact with the seal plate 4 at a point Q. This contact hinders the smooth running of the strip 1, and also causes scratches on the width edges of the strip 1. In the present invention, the seal plates 4, 4' are arranged only on the top of the gas pad surface 2, as shown in FIG. 3 (C-2). According to the knowledge of the present inventors, the elevation angle θ is 30
~70° is preferred. If it is less than 30', the force for inclining the strip plate 1 is weak.

Further, even if the angle exceeds 70°, the strip plate 1 only bulges laterally, and the increase in the force for tilting it is small, and as already mentioned, since the end of the strip plate 1 contacts the seal plate 4, the strip plate 1 Smooth running is obstructed, and scratches occur on the strips.

In the present invention, the V-shaped slit and the seal plate can prevent the strip plate 1 from meandering even when used alone, but according to the findings of the present inventors, by using the V-shaped slit and the seal plate together, the strip plate 1 can be prevented from meandering. The effect of preventing meandering running in No. 1 increases synergistically.

The guide nozzle of the present invention prevents the ear waves and elongation of the strip 1 from coming into contact with the gas support device. Figure 4 shows the guide nozzle 5.
, 5'. FIG. 4(A) shows a conventional comparative example in which no guide nozzle is provided, and the dotted line 6-1 is the running path of the strip plate 1 without ear waves or middle elongation (hereinafter abbreviated as ear waves, etc.). According to the observations of the present inventors, when the strip plate 1 is bent along the gas pad surface 2 above 14-14' below the floating gas jet slit 9, the height of the ear waves, etc. However, when it hangs below 14-14', the height of the ear wave etc. is large at d□. Also, since the strip 1 is not restrained below the arrow 14-14',
It runs while swinging in the direction of arrow 15. Therefore, the ear wave portion and the middle extension portion of the band plate 1 are likely to come into contact with the lower ends R and R' of the gas pad surface 2.

Fig. 4(B) shows an example in which guide nozzles 5, 5'' are provided, and gas is further injected from the guide nozzles 5, 5' onto the band plate 1 having ear waves.The gas from the guide nozzles 5, 5' is By the injection, the track at 14-14' of the strip 1 is pushed further outwards, preventing the ear waves etc. of the strip 1 from coming into contact with the lower end of the gas support device.As already mentioned, the guide nozzle 5 ,5'
Since the amount of gas injected from the guide nozzles 5, 5' is adjusted by the size of ear waves etc. and the swinging path of the strip plate 1, the gas to be ejected from the guide nozzles 5, 5' is introduced from a separately provided gas introduction hole 8-2. do.

The effect of the present invention has been described with respect to a gas support device for changing the running direction of a strip that moves downward after rising. It is clear from the above description that the same effect can be achieved as a gas support device for use.

[Example] The present inventors carried out vertical annealing of the gas support device of the present invention shown in FIG. 1 as shown in FIG. 6.

FIG. 6(A) shows a strip annealing equipment consisting of a heating zone 20 and a cooling zone 21, FIG. 6(B) is a detailed explanatory view of the top, and FIG. 6(C) is a front view.

The implementation conditions are that the strip size is 0.15 to 0.6 m thick.
m), width (700-100100O, tension 0.05-
0.2kg/■”, traveling speed of the strip 5m/++in~
The speed was 60 m/win, and the strip was transported while being floated at d0 = 5 to 10 cm. There was little meandering of the strip and there was no contact between the strip and the gas pad, making stable operation possible.

[Effects of the Invention] By carrying out the present invention, in a gas support device for changing the running direction of a strip that moves downward after rising or moves upward after descending, the strip runs in a meandering manner. Moreover, it is possible to support and run strip plates with ear waves and medium elongation without contact.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the gas support device of the present invention, Fig. 2 is an explanatory diagram of the action of the V-shaped slit of the invention, Fig. 3 is an explanatory diagram of the action of the seal plate of the invention, and Fig. 4 is an explanatory diagram of the action of the seal plate of the invention. FIG. 5 is a diagram illustrating the operation of the guide nozzle of the invention, FIG. 5 is a diagram showing an example of a conventional gas support device for changing the running direction of a strip, and FIG. 6 is a diagram showing a device according to an embodiment. ■=Strip, 2: Gas pad surface, 3.3
': V-shaped slit, 3-1 (3'-1): V
Bottom, 4.4': Seal plate, 5.5': Guide nozzle, 6: Running direction of the strip plate, 7: Gas support charge, 8 (
8-i. 8-2): Gas introduction hole, 9: Gas bath slit for floating soil, 10: Partition wall, 20: Heating zone, 21: Cooling zone,
40 (40'): Conventional side plate. 1f11 [Patent applicant: Nippon Steel Corporation

Claims (1)

[Claims] A gas support device for changing the traveling direction of a strip 1 that travels by going down after going up or going up after going down, the gas support device having a gas pad surface 2 having a convex arc surface. ,
The gas pad surface 2 has a pair of V-shaped slits 3, 3' formed at the top of the convex portion, and the V-shaped slits 3, 3', which are arranged outside both ends of the width of the strip plate 1 and have V-shaped bottoms facing outward. Strip 1 on the outside of 3'
a pair of sealing plates 4 parallel to the traveling direction of and substantially perpendicular to the arc surface;
4', and further characterized in that the gas pad surface 2 has horizontal slit-shaped guide nozzles 5, 5' on the inlet and outlet sides of the strip 1, for changing the running direction of the strip. Support device.