JPH04323155A - Floating transfer device for strip - Google Patents

Abstract

PURPOSE:To make passing-through of the tip of a strip easily by providing a meandering detector for strip and a linear motor and also providing a controller for suppressing the phase and output of the linear motor by the output from the meandering detector to support the strip at no-contact and prevent the strip from meandering. CONSTITUTION:A fluid chamber 56 is positioned on a fluid supporting roll and a fluid blowing holes 52 are provided in a roll main body 50, on which a strip 3 is wound and supporting the strip 3 while transferring it, separately from each other in longitudinal direction of the roll to float the strip. The fluid blowing holes 52 are provided through the entire length of the roll by over two rows symmetrically on right and left sides relative to the center of the roll. Also the roll main body 50 is made hollow to serve it as a kind of reservoir of the fluid. At the edge of the strip 3 on its upstream side, a meandering sensor 53 and a linear motor 55 are provided, and a detecting signal from the meandering sensor 53 is sent to the linear motor 55 through a controller 57 to correct the meandering.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating conveying device for strip, and more particularly to a device for fluidly supporting a traveling steel strip in a continuous annealing furnace, a continuous plating furnace, a continuous coating furnace, etc. for steel plates. The present invention is generally applicable to other metal strip conveyance and processing lines, and hereinafter such processing objects will be collectively referred to as strips.

0002

[Prior Art] Journal o
f the Iron and Steel Inst
itute (May, 1963, pp. 401 ~
408), the following two are shown as representative examples. ■Includes a large number of air bearings As shown in a schematic perspective view in FIG. 1, a large number of nozzle holes 2 having a cross-sectional shape as shown in FIG. and strip 3 on top of it
In this method, the strip 3 is suspended and supported in a non-contact manner to be conveyed. Note that in FIG. 1, reference numeral 4 indicates an inlet pipe for high-pressure fluid such as air.

However, it is stated that such a method is not practical because if the tension of the strip is increased, a very large air pressure is required to float the strip, and the strip swings a lot. Even with this type of method, for example, as described in JP-A-62-167162, improvements can be made to prevent the strip from swinging, so that it can be used for photographic film, photographic paper, magnetic tape, etc. It is applied to lightweight objects with low ejection pressure of fluids such as air. However, there are too many nozzle holes,
This method requires a very large fluid ejection pressure and is uneconomical, so it cannot be applied to floating conveyance of metal strips. This is because the idea of floating the strip using energy ejected from multiple air bearings is unreasonable.

■Applying the principle of hovercraft As shown in a schematic cross-sectional view in FIG. This method applies the principle of a hovercraft, in which the jet of fluid collides with the strip 3 to change the direction of the flow, and utilizes the cushion pressure generated in an area surrounded by a curtain of fluid. This method also basically supports the strip by converting the kinetic energy of the fluid into static or dynamic pressure.

A flotation device shown in FIG. 4 has been proposed as one type based on this method. In the figure, fluid from fluid supply pipe 4 is ejected from inwardly facing nozzles 2, 2' toward strip 3, causing it to float. However, this device has a problem in that the floating height differs in the longitudinal direction of the strip, and measures to improve this problem have been proposed in JP-A-62-139832 and JP-A-62-1.
This is disclosed in Japanese Patent Application No. 42728, etc., in which the apparatus shown in FIG. 4 is of a multi-divided type, and the fluid supply balance to each section is changed to achieve uniformity. Basically, it is constructed as a strip support device using a fixed drum.

[0006]

[Problems to be Solved by the Invention] When a strip is supported in a floating manner, the tension and the buoyancy force are balanced, so that the strip is stabilized in the longitudinal direction. However, since the restraining force in the width direction hardly acts, when the strip meanderes, it is not corrected naturally. JP-A-62-167163 discloses a floating conveyance device that uses a linear motor to suppress meandering of the strip. However, in such an apparatus, since the apparatus itself uses a fixed drum as shown in FIG. 4, it is very difficult to thread the tip of the strip.

[0007] Even if there is no need to use such a floating conveyance device, if such a fixed type is used, it is necessary to use it in a constantly floating state for all threaded materials, which is costly and uneconomical. . Although a line configuration having separate floating conveyance devices and rolls is also possible, the running path of the strip cannot be easily changed, resulting in poor operational efficiency. In addition, in the linear motor control method shown in the above publication, when the amount of meandering becomes zero, the output of the linear motor becomes equal on the left and right sides, or the output becomes zero, so the strip meanders again. This causes the problem that the strip is unstable.

The object of the present invention is to solve the problems of the prior art as described above, and (1) to provide a highly economical, compact and stable strip, and (2) to prevent the meandering of the strip and provide stability. (3) It solves the difficulty of threading at the tip of the strip, and (4) It is a practical floating conveying device that can levitate strips under high tension, allowing the use of floating conveying devices and rolls to be selected as appropriate. The goal is to provide the following.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention have conducted various studies and have confirmed the following matters, and have completed the present invention based thereon. (1) In a device that transports a strip by wrapping it around a roll, a normal transport roll is arranged on the surface facing the strip, and a fluid is supplied between the strip and the roll on the entrance and exit sides of the roll. This allows a fluid reservoir to be formed between the roll circumferential surface and the strip surface, thereby making it possible to float and support the strip in a non-contact manner.

(2) at least a portion of the roll surface other than the strip winding surface of the roll;
Usually, when fluid chambers are installed facing each other along the roll circumference on the opposite side of the strip winding surface and extend in the longitudinal direction of the roll, a boundary area is formed between the roll circumferential surface and the fluid chamber. The fluid ejected along the roll surface as a fluid jet can effectively support the strip.

(3) A practical strip levitation conveyance device can only be obtained by further providing a mechanism that can suppress strip meandering by detecting the meandering of the strip with a detector and controlling a linear motor based on the output thereof. .

Here, the gist of the present invention is to provide a roll for winding a strip and supporting the strip while conveying the strip, and a roll for supporting the strip in the longitudinal direction of the roll while facing at least a part of the roll surface other than the strip winding surface. A strip flotation conveyance device comprising a fluid chamber extending from the roll surface and ejecting fluid along the roll surface, and a fluid supply pipe connected to the fluid chamber, the device comprising: a strip meandering detector; and a linear motor. and a controller for suppressing the phase and output of the linear motor based on the output of the meandering detector.

[0013]

[Operation] Next, the present invention will be explained in more detail with reference to the accompanying drawings. FIG. 5 shows an example of a simple device configuration according to the present invention. In the device shown in FIG. 5, a fluid chamber is arranged in a fluid support roll according to the invention. In the present invention, the roll main body 50 that wraps around the strip and supports the strip while conveying the strip may be a normal roll, but it is preferable to provide fluid blow-off ports 52 spaced apart in the longitudinal direction of the roll. , the strip will float more easily. Typically, these fluid outlets 52
Two or more stripes are provided symmetrically with respect to the roll center over the entire circumference of the roll. Fluid is supplied to the fluid outlet 52 through a fluid supply pipe 54. The roll body 50 is usually hollow and functions as a kind of fluid reservoir.

[0014] At least two fluid blowing nozzles are disposed on the surface of the roll symmetrically in the longitudinal direction, extending over the entire circumference, and preferably the blowing angle of the fluid blowing opening is set to 3.
By setting 0゜≦θ≦90゜, the fluid can be ejected isotropically, and this also forms a fluid stagnation at the interface between the strip and the roll, making the strip levitated, that is, the fluid is ejected isotropically. Support without contact becomes easy.

Roll body 50 constituting the fluid support roll
A fluid chamber 56 is provided on the side opposite to the strip winding surface of the roll, which faces the roll surface. Note that the fluid chamber may be provided facing at least a part of the roll surface opposite to the strip winding surface, and does not necessarily have to be provided on the entire surface.
You may also provide one. A slit portion formed at the boundary between the fluid chamber 56 and the roll body 50 constitutes a fluid jet port 58 that supplies fluid to the interface between the roll body and the strip. In the illustrated example, two fluid jet ports 58 are provided on both sides of the roll main body, one on the front side and the other side as viewed in the drawing. code 59
indicates a fluid supply pipe to this fluid chamber 56.

[0016] Furthermore, by combining the above-mentioned fluid outlet and a fluid blowing nozzle, that is, by providing the fluid outlet and installing a fluid chamber along the circumference of the roll in an area adjacent to the strip winding surface of the roll. , the floating height of the strip on the roll winding surface can be made more uniform. Furthermore, according to the invention, a meandering sensor 53 and a linear motor 55 are provided at the edge of the upstream strip 3. A detection signal from the meandering sensor 53 is sent to the linear motor 55 via the controller 57, and the meandering is corrected. FIG. 6 shows an example of a preferable cross-sectional shape of the support roll body 50. FIG. 7 schematically shows the shape of a part of the inner roll 60 of the fluid support roll shown in FIG.

In the illustrated structure, the roll body 50 has an inner roll 60 and an outer roll 62 assembled therein. The inner roll 60 and the outer roll 62 may be attached and detached using an appropriate fitting mechanism. The fluid outlet 52 is formed by inner and outer rolls 60, 62,
The blowout angle (θ) of this fluid blowout port 52 is preferably 30°≦θ≦ with respect to the roll center axis as shown in the figure.
It is adjusted to 90°. In the illustrated example, the fluid outlet 52
The angles of the inner walls are different, but in such a case, the maximum angle is defined as the blowout angle in the present invention. In the figure, reference numeral 63 indicates a hollow portion of the roll body 50, which acts as a fluid reservoir.

As can be clearly seen from FIG. 6, the fluid supply pipe 5
The fluid from 4 is sent to the roll body 50, once enters the hollow part 63 as a fluid reservoir, and then passes through a plurality of holes 70 provided in the tapered end surface of the inner roll 60 to the fluid outlet 5.
Sent to 2. FIG. 8 is a schematic perspective view showing an example of the fluid chamber 56, showing the length W1 of the slit portion 80 constituting the fluid jet port 58 of FIG. 5, the width W2, the length W3 of the fluid chamber, and the slit portion 80. There is no particular restriction on the height d, that is, the height d of the nozzle opening. For example, if the strip width is fixed, it is desirable that the length W1 of the slit portion 80 coincides with the strip width, but in a normal manufacturing line, it is rarely the case that the length W1 is the same as the strip width. Therefore, since the nozzle width becomes unstable if it is less than 70% of the strip width, it is preferable to set the nozzle width to be 70% or more of the maximum strip width.

FIG. 9 is a schematic cross-sectional view showing one example of a linear motor 55 used in the present invention. It consists of a coil element 90. Note that the meandering sensor 53 used in the present invention is not limited to a specific structure, and any commonly used optical type or electromagnetic type is sufficient.

Next, the operation of the floating conveyance device according to the present invention will be explained.

(1) When the fluid supply is stopped As is clear from the above explanation, the roll body 50
Since it also functions as a normal transport roll, it is very easy to handle when passing the tip of the strip through the sheet. In addition, for thick materials and low-grade materials with few problems such as defects and shape defects, it is possible to easily shift from fluid levitation conveyance to roll conveyance, or vice versa, without any particular labor such as switching lines.

(2) During levitation conveyance using fluid When starting levitation conveyance of a strip using fluid, fluid is first introduced into the levitation conveyance device from the outside via the fluid supply pipes 54 and 59. , as shown in FIG. 5, are supplied to the roll body 50 and the fluid chamber 56, respectively. The fluid sent to the roll body 50 here is stored in the hollow part 63 at the center of the roll as shown in FIG. 6, and then the fluid flows in the direction of the arrow shown in FIG.
Hole 70 provided in the end tapered surface (see Figure 7)
The fluid is ejected radially from the fluid outlet 52 provided on the roll surface.

At this time, the fluid is blown out from the fluid outlet 52 on the lower surface of the roll body 50, as can be seen from FIG.
(see). On the other hand, the fluid supplied to the fluid chamber 56 installed on the lower surface of the roll is supplied to a fluid spout 5 formed by a slit portion formed on the boundary line with the roll surface.
It erupts from 8.

FIGS. 10 and 11 show cross-sectional views of the floating state of the strip 3 at this time. First, in the roll axis direction, as shown in FIG. After that, it collides with the fluid stored between the strip and the roll, turns around, and flows out from the edge of the strip. On the other hand, in the circumferential direction of the roll, as shown in FIG. 11, the fluid exiting the fluid jet port 58 is once sent toward the top of the roll, but then similarly reversed and flows out from the bottom of the fluid chamber 56. .

By ejecting the fluid from both the fluid outlet 52 and the fluid outlet 58 in this manner, the strip is suspended and supported via the fluid while being wound around the roll body 50. Furthermore, if the roll is a normal roll, the effect shown in FIG. 10 is not present, and although the uniformity of the levitation height on the roll is somewhat reduced, levitation is possible. However, in this case, the required supply amount from the fluid chamber increases.

(3) Structure for making the fluid ejected from the roll body more isotropic As shown in FIG. Preferably, a partition plate 140 is provided. At this time, preferably the inner roll 60 is provided with partition plates 140 and at the same time the outer roll 62 is provided with grooves 140 corresponding to each partition plate 140.
are made, and by fitting these partition plates and grooves together when fitting the inner and outer rolls, the flow of fluid in the circumferential direction is suppressed. In other words, even if the lower surface of the roll is supported by the fluid chamber 56, the fluid is ejected isotropically from the roll body 50 in the roll circumferential direction, so more uniform flotation is possible. Moreover, in this way, the partition plate 140
7, holes 70 shown in FIG. 7 are provided between each partition plate.

(4) Structure for suppressing meandering When the strip is conveyed by rolls, the strip does not meander significantly because of the restraint by the rolls. Furthermore, even when meandering is likely to occur due to an extremely long entry span, stable running is possible by providing a crown similar to that of a normal conveyance roll.

However, when conveying the strip in a floating manner, the strip is very unstable in the width direction, so meandering easily occurs, and even if an attempt is made to correct the meandering, it will be overcorrected and stable conveyance cannot be achieved. This is often seen. FIG. 5 shows an example of a meandering prevention device for a strip when it is levitating. The device shown in FIG.
, a linear motor 55 , and a controller 57 that controls the moving direction and output of the magnetic field of the linear motor 55 according to the amount detected by the meandering sensor 53 . In the present invention, the linear motor 55 is controlled by feeding back the amount detected by the meandering sensor 53, thereby eliminating instability in the feeding of the strip. The basic operation for preventing strip meandering in the present invention will be shown using FIG.

In FIG. 13, for example, when meandering occurs on the upstream side of the strip 3, the meandering sensor 53 detects an off-center amount δ. Then the controller 57 (
(see FIG. 5) so that the magnetic field of the linear motor 55 is directed in the direction F1, and the voltage applied to the linear motor 55 is increased. The amount of meandering of the strip 3 is reduced by the thrust F1 of the linear motor 55, and the thrust F1 at this time is fed back to the meandering sensor 53, which increases the output of the linear motor 55, that is, the thrust F1, until the amount of meandering finally becomes zero. The output of the linear motor 55 is maintained at the stage when the meandering disappears. If the amount of meandering from the upstream side of the device is constant,
Stable in this state. If there is further meandering to the same side, the output is further increased to correct the meandering. If meandering occurs on the opposite side (this includes a state where the thrust of the linear motor necessary for correction is reduced due to the meandering on the upstream side being reduced, resulting in oversteer), the thrust of the linear motor 55 is changed to the amount of meandering. The thrust F1 is reduced so as to be balanced with this, and the thrust F1 at that time is fed back to the meandering sensor 53, and when the meandering amount becomes zero, the output is maintained.

When the meandering on the upstream side changes significantly to the negative (-) side, it is necessary to further reduce the thrust, and the voltage is lowered, but when the voltage reaches 0, the linear motor 55 After reversing the phase to the F2 direction, increase the voltage until the meandering becomes 0. In this way, the output of the meandering sensor 53 is fed back to the linear motor 55.
However, as is clear from this method, voltage is applied to the linear motor 55 so as to generate a thrust corresponding to the meandering on the upstream side even when the meandering is 0 at the meandering sensor position. There may be cases where

[0031] The installation position of the linear motor 55 may be on the upstream side of the roll body or at a position opposite to the roll body, and is not particularly limited. Further, it goes without saying that the output of the linear motor 55 should have a capacity sufficient to cope with the possible amount of meandering. As already mentioned, the strip floating conveyance device is relatively stable because it is under a certain tension in the longitudinal direction, but it is quite unstable in the width direction, and meandering is inevitable. In particular, it is not possible to construct a practical conveying device with a speed of 2 to 300 m/min or more. Therefore, by combining the meandering prevention device as described above, the amount of meandering can be suppressed to several mm or less, and a practical device can be obtained.

[0032]

[Example 1] In this example, using gas (air) as the fluid, the levitation conveyance device according to the present invention was incorporated into the strip 3 conveyance model line shown in Fig. 14, and a test of levitation conveyance of the strip 3 was conducted. . That is, A in FIG.
In place of the roll in position , a floating conveyance device shown in FIG. 15 was installed. Here, the roll main body 50 and fluid chamber 56 constituting the fluid support roll were as shown in FIG. The roll diameter of the roll body 50 was 150 mm, and the body length was 320 mm. In FIG. 15, the blower 100
From valve 102, flow meter 104 and pressure gauge 1
06 is ejected from the roll body 50 and the fluid chamber 56, and supports the strip 3 while floating. On the other hand, a linear motor 55 is installed on the input side of the strip 3.
A meandering sensor 53 is provided to control the linear motor 55 according to the amount of meandering. As the meandering sensor 53, an optical type was used.

[0033]Furthermore, the amount of fluid ejected from the roll 50 and the fluid chamber 56 was adjusted based on the measurement data of the flotation amount measurement sensor 110 provided on the roll to ensure a constant flotation amount.

[0034] The roll 50 is driven by a motor (not shown), and its rotation speed and direction can be freely selected, and it can also be set to non-rotation. When the strip 3 to be threaded is not floated, it is natural that the line speed and roll rotation speed match, but even when it is floated, it is difficult to match the line speed data measured elsewhere. By rotating the rolls, it is possible to select between floating and non-floating without causing scratches or the like while the vehicle is running. Using such a device, the sample material is 0.
．． An Al strip with a thickness of 1 mm and a width of 280 mm was used and was run at a speed of 0 to 320 m/min. Tension is 1-40
It was variable in kg. Floating conveyance was carried out by intentionally changing the meandering amount in various ways on the upstream side, but due to the effect of meandering correction by the device of the present invention, it ran stably with an off-center amount within a range of ±0.5 mm on the levitating conveyance device. did it.

[0035]

[Example 2] In this example as well, gas (air) was used as the fluid, but as shown in Fig. 16, a 90° direction-changing floating conveyance device was introduced to the top roll on the plating outlet side of the hot-dip plating line. We tested its transport conditions. In this example, the fluid chamber 56 is divided into sections, each of which is provided adjacent to the strip winding surface of the roll, and is connected by a shielding plate 112. Further, in order to prevent meandering, a linear motor 55 is disposed opposite the roll body 50 as shown in FIG. The structure of the linear motor 55 at this time is partially enlarged and shown in FIG. It is substantially the same as that shown in FIG. 9 except that it is formed in a shape along the outer periphery of the roll body 50.

[0036] In the floating conveyance device, the roll main body 50 is a flat roll with a roll diameter of 1500 mm and a body length of 2200 mm, and the nozzle width WO is 1600, 1200, 900 mm.
It has 3 pairs of fluid outlet ports symmetrically. In this way, 0.35 to 1
．． When levitating a 2 mm thick strip, an air supply rate of 250 to 1000 m3/min was required. In this way, by providing a floating conveyance device on the plating outlet side, it was possible to change the direction of the strip in an unsolidified state, and the speed of the line was increased. In addition, since it was prevented from being picked up by the roll and was floated, it was possible to suppress the occurrence of flaws. The amount of meandering was within the range of ±3 mm even at a threading speed of 100 to 250 m/min, and stable operation was achieved. In addition, since it also functions as a normal roll, inconvenience during maintenance such as board threading is eliminated.

[0037]

Example 3 In this example, an electrolytic solution was used as the fluid, and the fluid support device according to the present invention shown in FIG. 5 was used as a roll in a tank of an electroplating line. The roll diameter of the roll main body 50 used in this example is 800 mm, and the body length is 2.
150 mm, and the nozzle width W0 was 1700 mm. A strip of 1850 mm width x 1.4 mm thickness was floated and conveyed at a threading speed of 250 m/min under a tension of 4 tons. As a result, it was confirmed that even when the floating conveyance device according to the present invention is used in a liquid, the strip can be conveyed by floating. In this example, the linear motor 55 was completely sealed liquid-tight and was also equipped with a meandering sensor 53.

Furthermore, according to the device of the present invention, the meandering amount is ±1 m.
m and very stable. Since the submerged roll does not require a crown, the warping of the plate is reduced, and the electrodes can be brought closer together, making the amount of plating coating much more uniform.

[0039]

[Effects of the Invention] As explained above, according to the present invention,
It has the great effect of being able to prevent the strip from meandering, making it easy to thread the tip of the strip, and being able to support the strip in a compact and stable manner without contact, which solves all of the conventional problems. , the practical significance of the present invention is great.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of an example of a conventional flotation device.

FIG. 2 is an explanatory diagram of a cross-sectional shape of a nozzle used in the flotation device of FIG. 1;

FIG. 3 is a schematic explanatory diagram of the principle of a hovercraft.

FIG. 4 is a schematic perspective view of another example of a conventional flotation device.

FIG. 5 is a schematic perspective view of an example of a levitation conveyance device comprising a roll, a fluid chamber and a linear motor according to the present invention.

FIG. 6 is a schematic cross-sectional view of a fluid support roll according to the invention.

FIG. 7 is a partially schematic perspective view of an inner roll constituting the fluid support roll of the present invention.

FIG. 8 is a schematic explanatory diagram showing an example of a fluid chamber of the present invention.

FIG. 9 is an explanatory diagram of the structure of a linear motor used in the present invention.

FIG. 10 is an explanatory diagram of the floating state of the strip in the width direction according to the present invention.

FIG. 11 is an illustration of the longitudinally floating state of the strip according to the invention;

FIG. 12 is a schematic perspective view showing the installation of partition plates in a roll according to the invention.

FIG. 13 is an explanatory diagram of meandering correction using a linear motor.

FIG. 14 is a schematic explanatory diagram of the installation location and line configuration of the floating conveyance device in the embodiment of the present invention.

FIG. 15 is an explanatory diagram of a control system of a floating conveyance device used in an embodiment of the present invention.

FIG. 16 is a schematic explanatory diagram of the installation location and line configuration of a floating conveyance device in another embodiment of the present invention.

FIG. 17 is an explanatory diagram showing the installation positions of a linear motor and a fluid support roll.

[Explanation of symbols]

3: Strip 50: Roll body 52: Fluid outlet 53: Meandering sensor 54: Between fluid supply 55: Linear motor 56: Fluid chamber 57: Controller 58: Fluid spout 140: Partition plate

Claims (1)

[Claims] Claim 1: A roll that wraps around a strip and supports the strip while conveying the strip, and a roll that extends in the longitudinal direction of the roll while facing at least a part of the roll surface other than the strip winding surface, and that extends along the roll surface. A strip flotation conveyance device comprising a fluid chamber for ejecting fluid and a fluid supply pipe connected to the fluid chamber, the device comprising a strip meandering detector, a linear motor, and an output of the meandering detector. A floating conveyance device for strips, further comprising a controller for suppressing the phase and output of the linear motor.