JPH0791592B2 - Bend nozzle strip stable traveling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip stable traveling device for a bend nozzle that conveys strips in an arch shape in a floater furnace that floats and conveys the strips.

[0002]

2. Description of the Related Art Conventionally, as a bend nozzle for the above floater furnace, one shown in FIGS. The bend nozzle 52 of the floater furnace 51 diverts the strip S conveyed in the floater furnace 51 in a horizontal state obliquely downward, and is formed in an arch shape along the strip conveying direction (arrow X direction). Has been done.

The chamber 53, which is the internal space of the bend nozzle 52, is positioned symmetrically with respect to the central chamber 54 by a plurality of partition plates 55 arranged along the strip transport direction. Side chambers 54c, 54b, 54a, 54a, 5
It is divided into 4b and 54c. The central chamber 54
Blower 5 through duct 57 having air volume control valve 56
8, side chambers 54a, 54a, 54
b, 54b, 54c and 54c are air flow control valves 56, respectively.
ducts 57a, 57b, 5 having a, 56b, 56c
It is connected to the blower 59 via 7c, and the air ejection width can be adjusted symmetrically by opening and closing the air volume control valves 56, 56a, 56b, 56c.

On the upper portion of the bend nozzle 52, that is, on the surface facing the strip, air ejection holes (not shown) for communicating the inside and the outside are formed in accordance with a predetermined pattern, and the air supplied to each chamber 54, 54a to 54c is formed. It is designed to be ejected upward.

The side fences 60, 60 are strips S
The air ejection width of the bend nozzle 52 is adjusted according to the width of the bend nozzle 52, which is arranged movably in the strip width direction along the upper surface of the bend nozzle 52, and the distance between the side fences 60, 60 is adjusted by the drive device 61. It is possible.

In the floater furnace 51, the gap G'between the side fences 60, 60 and the strip S to be processed is adjusted by the drive unit 61. Also, the blower 5
The chambers 54, 54a to 54 based on the driving of
Air is supplied to c and is ejected upward from the air ejection hole. If the strip S to be processed is a wide W _L strip as shown by the alternate long and short dash line, the air flow control valves 56, 5
6a to 56c are all opened and all chambers 5
Air is ejected from 4, 54a to 54c. Further, when the strip S to be processed is a narrow width W _S that is slightly wider than the width of the central chamber 54, only the air volume control valves 56 and 56a are opened, and the other air volume control valves 56.
b and 56c are closed, and air is ejected from only the central chamber 54 and the chambers 54a and 54a on both sides thereof.

On the other hand, the strip S is conveyed from the direction of the arrow X to the area surrounded by the side fences 60, 60, and is pushed up by the air ejected from the bend nozzle 52 to be kept in a floating state. Further, the air blown on the lower surface of the strip S moves left and right along the lower surface of the strip S, and both ends of the strip S and the side fences 6 are moved.
It is jetted upward from the gap G'with 0 and 60.

[0008]

However, in the bend nozzle 52, by setting the gaps G'and G'between the strip S and the side fences 60 and 60 to be equal to each other, lateral runout or meandering is less likely to occur. Although it was possible to set it to the state, it was virtually impossible to correct it when lateral shake etc. actually occurred.
For that purpose, the strip S and the side fences 60, 60
In order to prevent contact with the above, the gaps G ′ and G ′ have to be set wide in advance and the amount of air blown by the blowers 58 and 59 must be increased more than necessary.

Further, there are several kinds of width standards of the strip S, and in order to obtain a stable traveling state of the strip S corresponding to each standard, the chamber 53 is divided into a large number of small chambers, and each small chamber is divided. Ducts and air flow control valves must be provided. For example, if there are four kinds of strips to be processed, as shown in the figure, the chamber is divided into seven chambers, and ducts and four air flow control valves for these seven chambers are required. Therefore, there is a problem that the space occupied by the duct becomes large and the control of the air volume control valve becomes complicated.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in a strip nozzle stable traveling device for a bend nozzle used in a portion where a strip is conveyed in an arch shape in a floater furnace, the bend nozzle is used. The chamber is divided into a center chamber and side chambers located on both sides of the center chamber, and its ceiling portion is provided with an inclined portion whose both ends extend obliquely downward toward the inside of the side chamber, and has a large number of air ejection portions. Cover with the strip levitation transfer section, and connect the center chamber and side chambers to the blower via the air volume control valves,
At both ends of the bend nozzle, a pair of side covers, which move in the width direction of the strip with a predetermined gap from the upper surface of the strip levitation conveying section of the bend nozzle and face the strip with a predetermined gap, are provided. The pressure between the bend nozzle and the strip is detected in the areas corresponding to the center chamber and the side chamber, respectively, and based on the detection result, at least one of the air volume control valve and the blower is operated to float on both sides of the strip. The pressure is adjusted equally.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the floater furnace 1 shown in FIG. 1, a chamber 3 which is an internal space of a bend nozzle 2 (hereinafter, referred to as “nozzle 2” in the description of the embodiments) includes partition plates 4a and 4a.
It is divided into a central chamber 5 and side chambers 6a and 6b symmetrically located on both sides thereof by b, and the central chamber 5 is connected to a blower 9 capable of adjusting the air volume via an air supply duct 7 having an air volume control valve 8. , Side chamber 6
a and 6b are connected to a common blower 12 capable of adjusting the air volume through air supply ducts 10a and 10b having air volume control valves 11a and 11b, respectively.

The ceiling portion of the nozzle 2 has a strip levitation conveying section 13 and cover supporting sections 14a, 1 located on both outer sides thereof.
4b, and the strip levitation transport unit 13 covers approximately half of the central chamber 5 and both side chambers 6a and 6b, and has an inclined portion 15a extending diagonally downward toward the inside of the side chambers 6a and 6b on the end side. , 15b, the cover support portions 14a, 14b are set at a position slightly higher than the strip levitation transport portion 13, and the inner end portions are located above the inclined portions 15a, 15b.

Further, an air ejection hole 17 (see FIGS. 4 and 5) or an air ejection slit is formed in a portion 16 (hereinafter referred to as "central transportation portion 16") of the strip levitation transportation portion 13 which covers the central chamber 5 in accordance with a predetermined pattern. Are formed. On the other hand, as shown in FIG. 3, air is blown to the portions 18a and 18b (hereinafter, referred to as “side transport portions 18a and 18b”) that cover the side chambers 6a and 6b of the strip levitation transport portion 13 along the strip width direction. Grooves 19a, 19
b and the guide grooves 20a and 20b (one air ejection groove 19
b and the guide groove 20b are formed at predetermined intervals.

Further, a pressure detector 21 for detecting the strip levitation pressure is provided in the central conveying section 16, and the opening of the control valve 8 is adjusted based on the detection result of the pressure detector 21. Has become. Similarly, pressure detectors 22a and 22b for detecting the strip levitation pressure are also provided on the side transfer portions 18a and 18b, respectively, and the air flow rate control valves 11a and 11b are operated based on the detection results of the pressure detectors 22a and 22b. The opening is adjusted respectively.

Side covers 23a and 23b also serving as side fences are arranged on the cover supporting portions 14a and 14b, respectively. This side cover 23a, 23
b is provided with guide metal pieces 24a and 24b (one guide metal piece 24b is not shown) at the bottom thereof.
4a and 24b are engaged with the guide grooves 20a and 20b of the side transfer portions 18a and 18b, respectively, and driven by drive devices 25a and 25b (only one drive device 25a is shown in part). Side transfer section 18
Above the a and 18b, the side transfer parts 18a and 18b are provided.
And a predetermined gap δ (see FIGS. 4 and 5) are separated from each other so as to be movable back and forth. The lower portions of the guide metal pieces 24a, 24b are projected laterally to prevent the side covers 23a, 23b from rising. In addition, the side covers 23a,
As shown in FIG. 3, 23b may be divided into a plurality of cover elements 23a 'and 23b' (one cover element 23b 'is not shown), in consideration of thermal expansion and thermal strain.

In the above structure, the air supply ducts 7, 10a, 10b are provided in the chambers 5, 6a, 6b of the nozzle 2, respectively.
Air is supplied from the blowers 9 and 12 through
The air supplied to the central chamber 5 is ejected through the air ejection holes 17 of the central transfer section 16, and the side chambers 6a,
The air supplied to 6b is the air ejection groove 19 of the side transfer parts 18a, 18b and the gaps 26a, 2b between the side transfer parts 18a, 18b and the cover support parts 14a, 14b.
It is jetted from each of 6b. The rotation speeds of the blowers 9 and 12 and the opening degrees of the air volume control valves 8, 11a and 11b are
It is determined from the air jet volume and the levitation pressure obtained from the plate thickness, the plate width, the levitation height, the tension applied in the conveying direction, etc. of the strip S.

The side covers 23a and 23b are the drive unit 2
The cover supporting portions 14a, 1 based on the driving of the 5a, 25b.
4b is moved in the strip width direction, and is set at a position facing both ends of the strip S conveyed in the floater furnace 1 with a predetermined nozzle gap G therebetween. For example,
The side covers 23a and 23b are arranged at the solid line position when the wide W _L strip shown in FIG. 1 is conveyed, and above the side conveyance units 18a and 18b when the narrow W _S strip is conveyed. Set to the position shown by the dotted line after advancing to.

Therefore, the strip S conveyed in the direction of the arrow X has the air ejection hole 17 and the air ejection groove 1 described above.
The air jetted from 9 is blown and pushed up by the wind pressure to be kept in a levitating state. Further, the air blown onto the strip S moves along the lower surface of the strip S, flows out from the front and rear ends of the nozzle, and is jetted onto the strip S from the nozzle gap G.

When the wide strip W _L shown in FIG. 1 is conveyed onto the nozzle 2, as shown in FIG. 4, the side covers 23a and 23b are entirely retracted onto the cover supporting portions 14a and 14b. is doing. Therefore, the air ejected from the air ejection hole 17 and the air ejection groove 19 moves outward along the strip S and moves inward through the gaps 26a and 26b on the inclined portions 15a and 15b and the nozzle gap G. , G and collide with each other, and are ejected to the outside through the nozzle gaps G, G. Further, since the air moving from the opposite direction collides with the nozzle gap G, the energy loss of the air is large and the strip S
Levitation pressure increases.

When the strip S to be processed is changed from a wide strip to a narrow strip, the drive devices 25a, 2
Based on the driving of 5b, the side covers 23a, 23b are advanced above the side transfer parts 18a, 18b to cover them, as shown in FIG. 5, and the nozzle gap G is set to a predetermined value. In addition, the air volume control valves 8 and 1 are
The opening degree of 1a, 11b and the rotation speed of the blowers 9, 12 are switched. Then, the air ejection hole 1 of the central chamber 5
The air ejected from 7 moves outward along the strip S, and the air ejected from the guide groove 20 and the gaps 26a and 26b moves to the side transfer portions 18a and 18b and the side cover 2.
3a and 23b, the gap δ is moved inward, these collide with each other at the nozzle gaps G and G, and are ejected to the outside through the nozzle gaps G and G.

The amount of air supplied to each chamber 5, 6a, 6b is adjusted based on the detection results of the pressure detectors 21, 22a, 22b. Specifically, the pressure detectors 21 and 2
The pressures on the central transfer section 16 and the side transfer sections 18a, 18b are detected by 2a and 22b, respectively.
Then, based on the pressure detection value, the air volume control valves 8, 11
The opening degree of a and 11b is adjusted, the floating amount of the strip S is kept constant, and lateral shake and meandering are corrected. Further, based on the results of the left and right pressure detectors 21a and 21b, the air supply amount to the side chambers 6a and 6b is adjusted so as to correct the pressure difference between them. Therefore, the levitation pressure and the levitation amount on both sides of the strip S are evenly balanced, and the strip S moves laterally, swinging, and meandering is reduced, and moves stably. Further, since the nozzle gap G is stabilized by reducing the lateral shake, even if the nozzle gap G is narrowed, the contact between the strip S and the side covers 23a and 23b also serving as side fences is reduced. Further, by reducing the nozzle gap G, the amount of ineffective air is reduced.

In the above description, the lateral runout of the strip S is corrected by adjusting the air volume control valves 8, 11a, 11b, but it may be corrected by adjusting the number of revolutions of the blowers 9, 12. Good. Also, the side chamber 6
Although air is supplied to the a and 6b from the common blower 12, separate blowers may be provided in the respective side chambers 6a and 6b. Furthermore, the pressure detectors 21 and 2
The mounting positions of 2a and 22b are the air supply ducts 7 and 10a,
It may be 10b.

[0023]

As is clear from the above description, according to the strip nozzle stable traveling device of the present invention, since the levitation pressures on both sides of the strip conveyed on the bend nozzle are controlled to be equal, the strip is controlled. Rolling, up and down of both ends, and meandering are reduced. Therefore, since the gap between the strip and the nozzle cover can be stably maintained at a narrow value, damage to the strip due to contact with the nozzle cover is eliminated, and the capacity of the blower can be reduced by reducing the amount of ineffective air. . Further, since air ejected from between the side cover and the strip flotation and conveyance section and between the strip and the strip flotation and conveyance section collides with each other in the nozzle gap portion, the internal pressure of the chamber, that is, the strip flotation pressure rises, and the strip flotation efficiency is increased. Will get better. Furthermore, since one side chamber may be provided on each side of the central chamber, the number of ducts and air volume control valves is small, and control can be performed easily.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a stable traveling device for a strip.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a partial sectional view of a strip stable traveling device.

FIG. 5 is a partial cross-sectional view of the strip stable traveling device.

FIG. 6 is a cross-sectional view of a conventional bend nozzle.

7 is a central vertical cross-sectional view of the bend nozzle shown in FIG.

[Explanation of symbols]

1 ... Floater furnace, 2 ... Bend nozzle, 3 ... Chamber, 5
... central chamber, 6a, 6b ... side chamber, 8, 1
1a, 11b ... Control valve, 9, 12 ... Blower, 13 ... Strip levitation transfer section, 14a, 14b ... Cover support section, 1
7 ... Air ejection holes, 19 ... Air ejection grooves, 21, 22a, 2
2b ... Pressure detector, 23a, 23b ... Cover member, 25
a, 25b ... Drive device, S ... Strip, δ ... Gap, G ... Gap.

Claims (1)

[Claims] 1. In a strip nozzle stable traveling device for a bend nozzle used in a portion where a strip is conveyed in an arch in a floater furnace, the bend nozzle is divided into a center chamber and side chambers located on both sides of the center chamber, and the ceiling thereof. Both end sides are covered with a strip levitation transport section having a plurality of air jetting sections, each of which has an inclined section that extends obliquely downward toward the inside of the side chamber, and the center chamber and the side chambers are respectively provided with air volume control valves. A pair of side covers that are connected to the blower via both ends of the bend nozzle and move in the width direction of the strip with a predetermined gap from the upper surface of the strip levitation transport section of the bend nozzle and face the strip with a predetermined gap. Is provided, and the bend detector and strip are The pressure between the two is detected in the areas corresponding to the center chamber and the side chamber, and based on the detection result, at least one of the air volume control valve and the blower is operated to adjust the levitation pressure on both sides of the strip equally. A strip nozzle stable traveling device for a bend nozzle characterized by the above.