JP3261925B2 - Fluid support roll and fluid support device for strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a levitation and conveying apparatus in a strip processing line, and particularly to a levitation and support of a running strip in a continuous annealing line, a continuous plating line, a continuous coating line, etc. of a steel sheet by a fluid force. The present invention relates to a roll and an apparatus using the same.

[0002] The present invention is also applicable to the transport of metal strips other than steel plates in a processing line.
In the following description, the term "strip" is used to include a steel plate and other metal strips.

[0003]

2. Description of the Related Art As a method of floatingly supporting a strip in a non-contact manner using a fluid, a method of arranging a large number of fluid bearings and a method of applying the principle of hovercraft are generally known.

In the method using a fluid bearing, a large number of nozzle holes are arranged on a drum-shaped outer peripheral surface, and high-pressure fluid is jetted from these nozzles to a strip wound around the outer peripheral surface to form a strip. It floats, supports and transports by contact.

[0005] When the strip is levitated by this method, if the tension of the strip is increased, a very large fluid pressure is required, so that the motion of the strip becomes large. For this reason, for example, Japanese Patent Application Laid-Open No. Sho 62-167162 discloses a method for improving the prevention of rocking of a strip. This method uses a light-weight fluid such as air such as a photographic film, photographic paper, or magnetic tape. Use is limited to those that do not increase the injection power. That is, if this method is applied to the floating support transport of the metal strip, the number of nozzle holes becomes too large, and a large ejection pressure of the fluid is required, which is uneconomical.

In the method applying the hovercraft principle, fluid ejected toward the inner peripheral surface of a strip conveyed by levitation collides with the strip, and the strip is levitated and supported by the cushion pressure of the fluid formed thereby. Things. In other words, it is a method of converting the kinetic energy of the fluid into static pressure or dynamic pressure to support the strip. However, when this method is applied to a fluid supporting roll, the problem that the floating height of the strip differs in the longitudinal direction of the strip. There is a point.

[0007] As a countermeasure, a strip floating supporting device for dividing a device using a fixed drum into multiple parts and adjusting the fluid supply balance of each to make the floating height in the longitudinal direction of the strip uniform is disclosed in Japanese Unexamined Patent Publication (Kokai) No. Sho. It is disclosed in JP-A-62-139832. However, in the case of transporting the strip by the device using the fixed drum, the running cost increases because the fluid must be continuously supplied. Therefore, in order to reduce the cost, it is desirable to transport the strip that does not require the floating transport by a roll. In addition, even in the work of threading the leading end of the strip, a problem may occur only with the floating conveyance device.

The present inventors have proposed, in Japanese Patent Application Laid-Open No. 4-157121, a floating transfer device compatible with roll transfer as a device that can easily switch between floating transfer and roll transfer while avoiding the complexity of switching. . However, in the case of levitation conveyance by this apparatus, there are problems that flaws occur on the roll surface, hindrance to stable running of the strip, and poor flatness of the strip.

In this apparatus, the ejection range of the fluid is uneconomical over the entire circumference of the roll. Therefore, in order to limit the ejection range, it is necessary to provide a sealing mechanism on the roll surface other than the surface on which the strip is wound. Flaws. Also, if there is a difference between the temperature of the strip and the ambient temperature, heat transfer occurs between the roll and the strip.
At this time, the heat deviation in the roll circumferential direction can be relatively reduced,
Uneven heating in the roll width direction is inevitable, and a thermal crown is formed on the roll. The change in the crown shape of the roll surface may induce meandering of the strip being conveyed on the roll, hinder stable running, or cause the strip to be flat.

A method of rotating a roll in order to prevent the supporting device from being deformed due to the uneven heat during the levitation conveyance is described below.
It is disclosed in JP-A-63-258354. However, this also cannot suppress the thermal crown formation described above. Japanese Patent Laid-Open No. 2-16 / 2005 discloses a method of suppressing the thermal crown by increasing the heat conduction of the roll to reduce the temperature difference in the axial direction.
Although disclosed in Japanese Patent No. 3326, the roll outer cylinder used in this method is divided at the nozzle portion, so that heat transfer in the axial direction cannot be secured in the roll structure, and the suppression of the thermal crown is suppressed. not enough.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to make it easy to switch between floating and roll transport of a strip.
Floating transport that can reduce the amount of fluid used by ejecting fluid only to the roll winding surface of the strip, and roll transport that can achieve stable running of the strip and prevent flat defects by suppressing the thermal crown A fluid supporting roll and a fluid supporting device.

[0012]

SUMMARY OF THE INVENTION The present invention, as shown in FIGS. 1, 2 and 10, comprises the following (1) strip fluid supporting roll and (2) strip fluid supporting apparatus. I have.

(1) A fluid supporting roll 1 for winding and carrying a strip and supporting the same, wherein a pair of air supply openings 10 for supplying fluid ejected to a roll winding area of the strip are separated in the roll axis direction. Fixed roll shaft 9 having
And a roll inner cylinder 7 having a plurality of air supply holes 8 around the entire circumference of a position rotatably circumscribing the roll shaft and facing the air supply opening, and circumscribing the roll inner cylinder integrally rotatable with the roll inner cylinder. It is composed of a slit nozzle 5 that can be opened and closed over the entire circumference of the position where the air supply opening faces, and a roll outer cylinder 2 having an air supply chamber 6, and has high heat conduction inside or on the surface of the roll outer cylinder. A fluid support roll for a strip, comprising a heating means 4 inside a metal sleeve 3 and a roll outer cylinder (see FIGS. 1 and 2).

It is desirable to provide a high heat conductive metal partition plate for partitioning in the roll radial direction in the air supply chamber of the roll outer cylinder.

(2) Auxiliary slit nozzle for ejecting fluid near the start line and end line of the strip roll winding
A fluid supporting device for a strip, wherein a fluid supporting auxiliary device 31 having 32 is disposed in proximity to the fluid supporting roll 1 of (1) (see FIG. 10).

The roll material used in the fluid support roll and the fluid support device of the present invention is required to have a strength as a structure that supports the tension of the strip when the roll is transported. Some heat-resistant steel or stainless steel may be used.

In the configuration (1), as the material of the high thermal conductive metal sleeve, copper, aluminum, silver, an alloy thereof, or the like can be used. As the heating means, it is preferable to use an electric heater or an induction heating device, but the heating device is not limited to these.

[0018]

The structure of the fluid supporting roll according to the present invention and the mode of using the same for floating conveyance and roll conveyance will be described separately.

A. Configuration of Fluid Support Roll FIG. 1 is a longitudinal sectional view showing an example of the fluid support roll of the present invention. As shown in the figure, a fluid supporting roll 1 around which a strip is wound and conveyed is provided with a fixedly mounted roll shaft 9.
And a roll inner cylinder 7 rotatably circumscribing the roll shaft 9 via a rolling bearing 12, and a roll outer cylinder 2 circumscribing the roll inner cylinder 7 so as to be able to rotate integrally with the roll inner cylinder 7. The roll shaft 9 is hollow, is connected to a fluid supply pipe 11 at a shaft end, and is provided with four air supply openings 10 spaced apart in the axial direction. The air supply opening 10 has a structure for supplying a fluid only to an area of the roll surface around which the strip is wound as described later, and a sealing mechanism is provided on the roll surface in order to limit a fluid ejection range as in the related art. Need not be provided, and there is no risk of generating a flaw on the roll surface.

The roll inner cylinder 7 has a plurality of air supply holes 8 in the entire circumferential direction at a position facing the air supply opening 10. Also,
The roll outer cylinder 2 has a slit nozzle that can be opened and closed over the entire circumference at a position facing the air supply opening 10. Therefore, the roll outer cylinder 2 is composed of an outer cylinder end member 2a, an outer cylinder intermediate member 2b, and an outer cylinder center member 2c divided in the roll axis direction, and each outer cylinder member is slidable in the roll axis direction. Provided. A slit nozzle 5 and an air supply chamber 6 are formed over the entire circumference of the roll surface by a combination of these outer cylinder members 2a, 2b, 2c.

The inclination angle θ ₁ of the slit nozzle 5 with respect to the roll axis is preferably set to 30 ° ≦ θ ₁ ≦ 60 °. By such a tilt angle theta _1, because it is possible for ejecting isotropically fluid from the slit nozzle, thereby facilitating levitation support strip to form a fluid cushion between the strip and the roll surface . The opening width of the slit nozzle 5 can be adjusted by sliding each outer cylinder member of the roll outer cylinder in the roll axis direction, and an appropriate floating support force can be obtained according to the dimensions and tension of the strip.

The roll outer sleeve 2 has a roll outer sleeve 2d
A high heat conductive metal sleeve 3 and a heating means 4 are arranged inscribed in the inside. Since the slit nozzle is closed at the time of roll transport, the high heat conductive metal sleeve is in close contact with the sleeve, so that heat conduction in the axial direction can be improved. Furthermore, by using the heating means, the temperature difference between the outer cylinder members of the roll outer cylinder that has been divided can be quickly eliminated, and the roll surface temperature can be made uniform to suppress the occurrence of thermal crown. By providing the high heat conductive metal sleeve and the heating means inside the roll outer cylinder in this manner, the uneven heating on the roll surface can be extremely reduced, and the trouble caused by the thermal crown can be prevented. Can be secured. Each of the fluid passages is hermetically sealed by an O-ring 13.

FIG. 2 is a longitudinal sectional view showing another example of the fluid supporting roll of the present invention. In the fluid supporting roll shown in FIG. 2, a high heat conductive metal sleeve 3 is provided on a roll outer shell of a roll outer cylinder 2. Thereby, the heat conduction in the axial direction can be further improved. 1 and 2
The heating means indicated by (1) has a heating device incorporated in the inside of the roll outer cylinder, and can adjust the temperature of the roll surface during roll transport to suppress the occurrence of thermal crown. The electrical connection of the heating equipment is performed, for example, by connecting a conductive brush made of copper alloy embedded in the roll inner cylinder 7 with electrical insulation and the heating equipment, and electrically insulated and embedded in the outer periphery of the roll shaft 9. What is necessary is just to make it contact a ring-shaped terminal and a conductive brush.

FIGS. 3A and 3B are views showing the roll shaft 9 of the fluid supporting roll 1 shown in FIG. 1, wherein FIG. 3A is a perspective view and FIG. 3B is a sectional view. A fluid supply port is provided in at least one of both ends of the fixedly installed roll shaft 9 to supply a fluid. Four air supply openings spaced apart in the roll axis direction are provided in a circumferential portion of the roll shaft 9 facing the strip winding surface.
10 are provided. In the figure, two pairs of air supply openings 10 are provided symmetrically in the roll axis direction, and fluid is injected from the air supply openings 10 toward the air supply holes 8 of the inner roll cylinder 7.

The shape of the air supply opening 10 is preferably a slit-like groove as shown, but a number of circular, oval or square holes may be provided. The injection range of the air supply opening 10 may be a range corresponding to the area of the roll winding surface of the strip to be passed.

The size of the opening may be the maximum allowable size in consideration of the strength of the roll shaft.

As described above, even when the roll inner cylinder 7 and the roll outer cylinder 2 rotate integrally, the air supply opening 10 provided on the roll shaft 9 is always directed to the region of the strip winding surface. Therefore, unnecessary fluid ejection to portions other than the strip winding surface is suppressed, and the amount of fluid used can be reduced. Further, there is no need to provide a seal mechanism on the roll surface other than the strip winding surface, and the occurrence of scratches on the roll surface can be prevented.

FIGS. 4A and 4B are views showing the roll inner cylinder 7 of the fluid supporting roll 1 shown in FIG. 1, wherein FIG. 4A is a perspective view and FIG. 4B is a sectional view. In the roll axis direction of the roll inner cylinder 7,
At least four, and preferably twenty or more air supply holes 8 are provided over the entire circumference of the position facing the air supply opening 10. The size of the air supply hole 8 is preferably equal to the size of the air supply opening 10 and may be circular, elliptical or square.

By providing the roll inner cylinder 7 concentrically in contact with the roll shaft 9, the fluid sent from the air supply opening 10 passes through the air supply hole 8 and is supplied to the supply cylinder provided in the roll outer cylinder 2. It is sent to the air chamber 6. Bearing grooves 12a are provided on the inner surfaces of both ends of the roll inner cylinder 7, and the roll inner cylinder 7 can rotate. An O-ring groove 13a is provided on the inner surface of the roll inner cylinder 7 in parallel with the air supply hole 8.
The structure is such that fluid does not leak from between the roll shaft 9 and the shaft.

FIGS. 5, 6 and 7 are views showing the structure of an outer cylinder member constituting the roll outer cylinder 2 of the fluid supporting roll 1 shown in FIG. FIG. 5 is a view showing an outer cylinder end member 2a, FIG. 6 is a view showing an outer cylinder intermediate member 2b, and FIG. 7 is a view showing an outer cylinder center member 2c. FIG. 1B shows a cross-sectional view. As shown in the figure, the outer cylinder members 2a, 2b, and 2c are fitted to the inner roll member 7 so as to be in contact with the outer cylinder member 7, thereby forming a slit nozzle 5 and an air supply chamber 6 in the outer roll member 2. Each outer cylinder member 2a, 2b, 2c is attached so as to be able to rotate integrally with the roll inner cylinder 7 and to be slidable in the roll axis direction. An O-ring groove 13a is provided on the surface circumscribed with the roll inner cylinder 7 and sealed to prevent the fluid from leaking in the axial direction.

It is desirable to provide a high heat conductive metal partition plate for partitioning in the roll radial direction in the air supply chamber 6 of the roll outer cylinder. That is, a high heat conductive metal partition plate and a corresponding partition plate groove can be provided in the outer cylinder end member 2a, the outer cylinder intermediate member 2b, and the outer cylinder center member 2c that form the air supply chamber 6.

FIG. 8 is a view in which a high heat conductive metal partition plate 20 is provided on the outer cylinder intermediate member 2b of the roll outer cylinder 2, and FIG. 9 is a view in which a partition plate groove 20a corresponding to the high heat conductive metal partition plate 20 is removed. It is a diagram provided on the cylinder end member 2a, (a) is a perspective view,
(b) shows a sectional view. By providing the high heat conductive metal partition plate 20, the air supply chamber 6 is partitioned in the radial direction, and the fluid flow in the circumferential direction in the air supply chamber 6 can be suppressed,
The fluid can be ejected isotropically from the slit nozzle 5. Further, as described later, it is also effective in suppressing the thermal crown. The number of the partition plates is two or more, more preferably twenty or more, and most preferably the same number as that of the air supply holes 8 provided in the roll inner cylinder 7.

FIG. 8 shows a case where the outer periphery of the high heat conductive metal partition plate 20 is inscribed in the inner periphery of the high heat conductive metal sleeve 3 and the heating means 4. The outer periphery or the outer periphery of the air supply hole 8 may be circumscribed. In FIG. 9, a partition plate groove 20a is provided facing the position where the partition plate 20 is provided. Accordingly, even when each member of the outer cylinder is slid in the roll axis direction, the partition plate 20 does not cause any trouble.

B. When used for levitation conveyance The levitation conveyance of a strip is possible by the above-mentioned fluid support roll, but by further arranging a fluid support auxiliary device close to it, it is easier to ensure stable running of the strip.

FIGS. 10A and 10B are views showing an example of a fluid supporting device in which a fluid supporting auxiliary device is arranged near the fluid supporting roll of the present invention, wherein FIG. 10A is a perspective view of the device, and FIG. FIG. 2 shows a longitudinal sectional view of a support assisting device. As shown in the drawing, the fluid support device 30 is provided with a fluid support auxiliary device 31 having an auxiliary slit nozzle 32 for ejecting a fluid in the vicinity of a roll winding start line and an end line of a strip near the fluid support roll 1. ing. If you want to levitate the strip,
The fluid is supplied from the fluid supply pipe 11 provided on the fluid support roll 1 and ejected from the slit nozzle 5, and the fluid is supplied from the auxiliary fluid supply pipe 33 provided on the fluid support auxiliary device 31. After that, it is ejected from the auxiliary slit nozzle 33. Here, the fluid jetting angle theta ₂ with respect to the circumferential direction of the roll of the auxiliary slit nozzle 32 is desirably a _{30 ° ≦ θ 2 ≦ 45 °} . As a result, the floating support of the strip in the vicinity of the roll winding start line and the end line of the strip is promoted, the strip can be prevented from contacting the roll, and more stable running can be achieved.

A feature of the fluid supporting roll of the present invention is that a slit nozzle can be selected in accordance with the strip width in the case of levitation conveyance. The nozzle for ejecting the fluid must be inside the strip width of the strip. If the strip width of the strip to be conveyed is constant, the slit nozzle to be used can be fixed, but it is rare that the strip width of the strip conveyed on the production line is single. Therefore, it is necessary to have a function of appropriately selecting a slit nozzle according to a change in the strip width of the strip.

FIG. 11 is a longitudinal sectional view showing an example of selecting a slit nozzle of the fluid supporting roll in response to a change in the strip width of the strip. In the illustrated example, the slit nozzle 5 formed by the outer cylinder end member 2a and the outer cylinder intermediate member 2b is closed, and only the slit nozzle 5 formed by the outer cylinder intermediate member 2b and the outer cylinder central member 2c is closed. You have selected. By having such a function, when the plate width of the strip is reduced, the interval between the slit nozzles in the roll axis direction is also reduced,
The number of slit nozzles can be reduced. Therefore, the floating conveyance of the strip can be performed without using an extra fluid for the change of the strip width.

C. When used for roll transport The fluid support roll of the present invention can suppress the thermal crown generated on the roll surface when applied to roll transport, and can achieve stable running of the strip and prevention of flatness failure.

FIG. 12 is a longitudinal sectional view showing a state in which the fluid supporting roll shown in FIG. 1 is used for transporting a strip. As shown in the figure, when the fluid supporting roll is applied to roll transport, the slit nozzle 5 does not need to be used, so the outer cylinder end member 2a of the roll outer cylinder 2, the outer cylinder intermediate member 2b, and the outer cylinder center member are used. 2c is slid in the roll axis direction to close all the slit nozzles 5. When all slit nozzles 5 are closed, roll outer sleeve
The high thermal conductive metal sleeves 3 in the respective outer cylindrical members 2a, 2b, 2c fitted and fitted in 2d are also in close contact with each other. Further, since the heating means 4 is provided below the high heat conductive metal sleeve 3, the action of the high heat conductive metal sleeve and the heating means may cause a temperature difference on the roll surface along with the roll conveyance, so that the heat in the axial direction of the roll. Heat transfer is promoted, and the roll surface temperature is made uniform. Therefore, the occurrence of the thermal crown of the roll is suppressed, the stable running of the strip is ensured, and the occurrence of poor flatness due to the transport of the roll can be prevented.

A specific embodiment will be described by taking as an example a case where a high heat conductive metal sleeve is provided inside the roll outer cylinder as shown in FIG. 1 described above. Copper, aluminum, silver, or the like can be used as the high heat conductive metal. In particular, when austenitic stainless steel is used for the roll body, there is an advantage that the difference in linear expansion coefficient is small when copper is used as the high thermal conductive metal sleeve.

FIG. 13 is a diagram showing the relationship between the thickness of the high thermal conductive metal sleeve and the difference in roll surface temperature. The roll material was austenitic stainless steel (SUS 304) and the high thermal conductive metal sleeve was a copper material. When a strip with a temperature of 250 ° C (sheet width 500 mm) is roll-conveyed, the higher the heat conductive metal sleeve thickness, the smaller the roll surface temperature difference (difference between the sheet width center position and the sheet width end position), resulting in high heat conduction. The effect of making the surface temperature uniform by the metal sleeve is recognized. That is, the difference in roll surface temperature to be removed by the heating means can be reduced. However, this effect tends to be saturated when the thickness of the sleeve exceeds a certain value, and it can be seen that when copper is used as the sleeve, a sufficient effect can be obtained by setting the thickness to about 15 to 20 mm.

In order to promote the heat transfer effect of the high heat conductive metal sleeve provided inside each of the outer cylinder members of the roll outer cylinder, it is necessary to bring the respective sleeves into effective close contact. To do this,
It is preferable that the outer cylinder members are brought into close contact with each other so that the contact pressure of the contact surfaces is 0.1 kg / cm ² or more. Also, the roughness of the contact interface
It is preferable to reduce the Ra to 1 μm or less.

FIG. 14 is a diagram showing an example of the arrangement of the high thermal conductive metal sleeve in the circumferential direction. In order to improve the heat transfer efficiency in the roll axis direction and minimize crown fluctuation in the circumferential direction, it is desirable to arrange them in a ring shape as shown in (a), but even if they are not ring shapes, they are shown in (b) As described above, a sufficient effect can be obtained even if the parts are divided and arranged close to each other in the circumferential direction.

FIGS. 15A and 15B are views showing the state of occurrence of a thermal crown at the time of transporting a roll by comparing a roll of the present invention with a comparative roll. FIG. 15A shows a high thermal conductive metal sleeve inside a roll outer cylinder of the roll of the present invention. (B) shows a case where a high heat conductive metal sleeve and a heating means are similarly provided inside the roll outer cylinder. Here, a copper sleeve is arranged in a ring shape as a high heat conductive metal sleeve, and an electric heater built-in sleeve is arranged in a ring shape as a heating means.

In a comparative roll without a heat transfer member or the like, when a high-temperature strip is wound around the roll, the temperature at the strip passing position rises, and a thermal crown is formed as shown by a dotted line in the figure. Then, the flat crown of the strip is likely to be generated due to the formation of the convex crown during the roll conveyance. On the other hand, the roll of the present invention provided with a copper sleeve
In (a), as shown by the solid line in the figure, the thermal crown is reduced, and the occurrence of flat defects due to roll conveyance is prevented. In addition, in the present invention roll provided with a copper sleeve and an electric heater built-in sleeve (FIG. (B)), by adjusting the calorific value of the electric heater provided on each of the outer cylinder members of the roll outer cylinder, it is possible to adjust the heat generation of each member. By making the roll temperature match the measured temperature of the central member, a temperature gradient in the roll axis direction can be eliminated.

Even if a high thermal conductive metal sleeve or a heating means is provided alone in the roll outer cylinder, the thermal crown can be reduced effectively. However, by using these together, the roll temperature at each position in the roll axial direction is made uniform, As shown by the solid line in FIG. 15 (b), the occurrence of the thermal crown can be completely eliminated.

FIG. 15 described the case where the strip has a high temperature. However, when a low-temperature strip is roll-conveyed by a roll installed in a high-temperature atmosphere, the crown shape of the roll becomes a concave crown, and the strip becomes a concave crown. It becomes easier to meander while running. Even in this case, if the fluid supporting roll of the present invention is used, the temperature distribution in the roll axis direction becomes uniform, the occurrence of the concave crown is suppressed, and the strip running stability can be obtained.

FIG. 8 shows an example in which a high heat conductive metal partition plate is provided in the air supply chamber of the roll outer cylinder. This partition plate has an effect of increasing the heat transfer surface in addition to the flow rectifying effect of the fluid. Of the thermal crown can be reduced. Also in this case, it is desirable to reduce the surface roughness of each partition plate and increase the fitting accuracy of each other. From the viewpoint of heat transfer, it is preferable that the number of the partition plates is large, but it is necessary to select the partition plate in accordance with the floating condition because of the flow path resistance of the fluid. According to the findings of the inventors, it is effective to arrange them at a pitch of 20 ° as a guide.

[0049]

EXAMPLES The effects of the present invention will be described based on examples.

Example 1 The following (1) levitation transport test and (2) roll transport test were performed using a strip transport line.

FIG. 16 is a view showing a schematic configuration of a strip transport line used in the first embodiment. The transport line incorporates a fluid support device 30 including a fluid support roll and a fluid support auxiliary device of the present invention. Gas (air) was used as the fluid. The specifications of the strip, the fluid supporting roll and the fluid supporting auxiliary device used in the test are as follows.

1. Strip: SPCC steel, 500mm wide, 0.15mm thick 200m / min running speed Fluid support roll: Roll diameter 500mm, roll body length 600mm ・ Slit nozzle: Two pairs (4 pieces) symmetrically in the roll axis direction Nozzle length 300mm and 400mm, nozzle opening width 2mm Nozzle inclination angle (θ ₁ ) 45 ° ・ Air supply 2. High thermal conductive metal divider in the room: 18 copper dividers Fluid support auxiliary device ・ Auxiliary slit nozzle: nozzle length 400mm, nozzle opening width 2.5mm nozzle inclination angle (θ ₂ °) 45 ° ・ Auxiliary air supply chamber: roll axial length 600mm Further, in the first embodiment, fluid support When austenitic stainless steel (SUS 304) is used as the roll, the outer diameter of the roll is 490mm, the inner diameter is 450mm, and the length is 500mm.
The copper sleeve is placed 5 mm below the surface of the roll, and an electric heater is inserted into the lower layer.
A thermocouple was embedded in mm.

(1) Floating transport test The levitation transport test of the strip was performed by supplying compressed air from the fluid supply pipe and the auxiliary fluid supply pipe, but the test was performed with respect to the tension of 1960 N (200 kg) measured by the tension measuring roll 43. Total flow 30
Nm ³ / min air was supplied. The flow rate of each slit nozzle was adjusted so that the floating of the strip became uniform. The flying height of the strip is measured by an eddy current type flying height measurement sensor.
The measurement was performed at four points shown in FIG.

FIG. 17 is a diagram showing the measurement results of the floating height in the strip plate width direction in the floating transfer test of the first embodiment. As is clear from FIG. 17, according to the fluid supporting device using the fluid supporting roll and the fluid supporting auxiliary device of the present invention, the floating height at any position is constant at 4 to 6 mm, and the stable uniform floating is achieved. Transport is possible.

(2) Roll transport test The roll transport test of the strip was performed using a roll in which the slit nozzle of the fluid supporting roll was closed and a hollow roll made of austenitic stainless steel (SUS 304) as a comparative example. went. The test strip is heated in a heating furnace 45.
The temperature rises to 300 ° C, and the temperature of the strip
After running at 270 ° C. and a running speed of 200 m / min for about 10 minutes, the roll profile was measured after the roll was sufficiently heated.

The measurement result of the thermal crown amount of the roll at the position corresponding to the center and the end of the strip width of the strip is 0.23 mm for the roll of the comparative example, and 0.02 mm for the fluid supporting roll of the present invention. there were. Based on these results, the thermal crown was reduced to about 1/10 or less by installing a copper sleeve to improve the heat conduction and installing an electric heater to heat the end of the roll outer cylinder in accordance with the output value of the temperature sensor. We can see that we can do it. Further, in the comparative example, the contact state between the strip and the roll due to the generation of the crown was not uniform, and the flatness of the strip occurred due to the influence of uneven tension caused by the thermal crown. On the other hand, in the fluid supporting rolls of the present invention, the thermal crown was suppressed in all cases, and no problems such as poor flatness of the strip occurred.

(Embodiment 2) In this embodiment, gas (air) is used as the fluid, and the fluid supporting device of the present invention is incorporated as a substitute for the top roll of the hot-dip plating line, and the floating transport test and the roll transport test of the strip are performed. Was done.

FIG. 18 is a partial side view of the hot-dip plating line used in the second embodiment. Hot dipping line plating bath 48
Incorporating the fluid support device 30 consisting of the fluid support roll and the fluid support auxiliary device of the present invention into the top roll on the output side,
The transfer status was confirmed. The specifications of the strip, the fluid supporting roll and the fluid supporting auxiliary device used here are as follows.

[0059] 1. Strip: SPCC steel, 0.6mm thick, 1800mm wide, 150m / min running speed Fluid support roll: Roll diameter 1800mm, roll body length 2200mm ・ Slit nozzle: Two pairs (4 pieces) symmetrically in the roll axis direction Nozzle length 900mm and 1500mm, nozzle opening width 5mm Nozzle inclination angle (θ ₁ ) 45 ° ・ Air supply 2. High thermal conductive metal divider in the room: 12 copper dividers. Fluid support auxiliary device ・ Auxiliary slit nozzle: Nozzle length 1800mm, nozzle opening width 10mm Nozzle inclination angle (θ ₂ °) 45 ° ・ Auxiliary air supply chamber: Roll axial direction length 2000mm In addition, the material of the fluid support roll and outside the roll The structure of the cylinder was the same as that in the first embodiment.

After the strip was hot-dip plated and transported by levitation, it was confirmed that the strip had a stable levitation height of about 15 mm. On the other hand, even in the roll conveyance, there was no flaw in the slit nozzle portion of the roll, and stable running of the strip was confirmed. Further, switching between the levitation conveyance and the roll conveyance was repeatedly performed, but the change could be performed instantaneously, and both conveyances could secure stable traveling.

[0061]

According to the present invention, the floating conveyance and the roll conveyance of the strip can be easily switched. In addition, since the fluid is ejected only to the surface where the strip is wound during the floating transfer, the cost can be reduced and the roll surface can be prevented from being scratched. A practical fluid support roll and fluid support device can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a fluid supporting roll of the present invention.

FIG. 2 is a longitudinal sectional view showing another example of the fluid supporting roll of the present invention.

3A and 3B are views showing a roll shaft 9 of the fluid supporting roll 1 shown in FIG. 1, wherein FIG. 3A is a perspective view and FIG. 3B is a cross-sectional view.

FIG. 4 is a view showing a roll inner cylinder of the fluid supporting roll of FIG. 1 ((a) and (b) are the same as FIG. 3).

5 is a view showing an outer cylinder end member 2a of a roll outer cylinder of the fluid support roll shown in FIG. 1 ((a) and (b) are the same as FIG. 3).

FIG. 6 is a view showing an outer cylinder intermediate member ((a) and (b)).
Is the same as FIG. 3).

FIG. 7 is a view showing the center member of the outer cylinder ((a) and (b)).
Is the same as FIG. 3).

FIG. 8 is a diagram in which a high heat conductive metal partition plate is provided on an intermediate member of the outer cylinder of the roll outer cylinder ((a) and (b) are the same as in FIG. 3).

FIG. 9 is a view in which a partition plate groove corresponding to a high heat conductive metal partition plate is provided in an outer cylinder end member ((a) and (b) are the same as in FIG. 3).

FIG. 10 is a view showing an example of a fluid supporting device in which a fluid supporting auxiliary device is arranged close to a fluid supporting roll of the present invention ((a) and (b) are the same as FIG. 3).

FIG. 11 is a longitudinal sectional view showing an example of selecting a slit nozzle of a fluid supporting roll in response to a change in a plate width of a strip.

12 is a vertical cross-sectional view showing a state in which the fluid supporting roll shown in FIG. 1 is used for strip roll conveyance.

FIG. 13 is a diagram showing the relationship between the thickness of the high thermal conductive metal sleeve and the difference in roll surface temperature.

14A and 14B are diagrams illustrating an example of a circumferential arrangement of the high thermal conductive metal sleeve, wherein FIG. 14A illustrates a ring-shaped arrangement, and FIG. 14B illustrates a divided arrangement.

FIG. 15 is a diagram showing a thermal crown generation state during roll conveyance by comparing the present invention roll with a comparative roll,
(a) shows the case where the high heat conductive metal sleeve is provided, and (b) shows the case where the high heat conductive metal sleeve and the heating means are provided.

FIG. 16 is a diagram illustrating a schematic configuration of a strip transport line used in the first embodiment.

FIG. 17 is a diagram showing a measurement result of a floating height in a strip plate width direction in a floating transfer test of Example 1.

FIG. 18 is a diagram illustrating a partial side view of a hot-dip plating line used in Example 2.

[Explanation of symbols]

1. 1. Fluid support roll Roll outer cylinder
2a. End member of outer cylinder 2b. Middle member of outer cylinder 2c. Center member of outer cylinder
2d. Roll outer sleeve 3. 3. High thermal conductive metal sleeve Heating means 5. Slit nozzle 6. Air supply room
7. Roll inner cylinder 8. Air supply hole 9. Roll axis
10. Air supply opening 11. Fluid supply pipe 12. Bearing
12a. Bearing groove 13. O-ring 13a. O-ring groove
20. Divider 20a. Divider groove 30. Fluid support device
31. Auxiliary fluid support device 32. Auxiliary slit nozzle 33. Auxiliary fluid supply pipe
34. Auxiliary air supply chamber 40. Coil rewind roll 41. Guide roll
42. Bridle roll 43. Tension measuring roll 44. Tension reel
45. Heating furnace 46. Strip 47. Flying height measurement sensor
48. Plating tank

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Mitsutomo Asugai 4-5-33 Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries, Ltd. (56) References JP-A-4-157121 (JP, A JP-A-63-277163 (JP, A) JP-A-2-163326 (JP, A) JP-A 55-113337 (JP, U) JP-A 60-1222739 (JP, U) JP-A 39- 26949 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 20/14

Claims (4)

(57) [Claims] A fluid support roll for winding and carrying a strip around a strip, the fixed roll having at least one pair of air supply openings for supplying fluid ejected to a roll winding area of the strip separated in the roll axis direction. A roll shaft, a roll inner cylinder having a plurality of air supply holes over the entire circumference of a position rotatably circumscribing the roll shaft and facing the air supply opening,
The roll inner cylinder is constituted of a roll outer cylinder having a slit nozzle and an air supply chamber that can be opened and closed over the entire circumference of a position where the air supply opening is circumscribed and rotatable integrally with the roll inner cylinder,
A fluid supporting roll for a strip, comprising a highly heat conductive metal sleeve and a heating means inside the roll outer cylinder. 2. A fluid supporting roll for winding and carrying a strip around a strip, the fixed roll having at least one pair of air supply openings for supplying a fluid ejected to a roll winding area of the strip separated in the roll axis direction. A roll shaft, a roll inner cylinder having a plurality of air supply holes over the entire circumference of a position rotatably circumscribing the roll shaft and facing the air supply opening,
The roll inner cylinder is constituted of a roll outer cylinder having a slit nozzle and an air supply chamber that can be opened and closed over the entire circumference of a position where the air supply opening is circumscribed and rotatable integrally with the roll inner cylinder,
A fluid support roll for a strip, comprising: a high heat conductive metal sleeve on the surface of the roll outer cylinder; and heating means inside the roll outer cylinder. 3. A fluid supporting roll for a strip according to claim 1, wherein a high heat conductive metal partition plate for partitioning in a roll radial direction is provided in an air supply chamber of the roll outer cylinder. 4. A fluid supporting auxiliary device having an auxiliary slit nozzle for ejecting a fluid near a roll winding start line and an end line of a strip in the vicinity of the fluid supporting roll according to claim 1, 2 or 3. A fluid support device for a strip, wherein the device is arranged.