JP6959582B2 - Meander control method for strip-shaped base material in non-contact transfer device - Google Patents

Description

The present invention relates to a method for controlling meandering of a strip-shaped base material in a non-contact transporting device in which a continuously traveling strip-shaped base material is floated by one or more floater groups and transported in a non-contact state with a transport roll.

In the manufacturing process of steel products, there are steps of performing various treatments such as heat treatment, plating treatment, and painting treatment while continuously running a strip-shaped base material such as a cold-rolled steel strip. In such a step, as a means for transporting the strip-shaped base material, "roll transport" is generally used in which the strip-shaped base material is transported while being in contact with the roll and supported.

However, for example, a step of applying various coating films to the surface of a strip-shaped base material such as a cold-rolled steel strip and then drying and baking the strip-shaped base material, or heat treatment at a high temperature while continuously running the strip-shaped base material is performed. In the process, the conventional roll transport method has a problem that defects such as scratches and peeling are likely to occur on the surface of the base material and the coating film coated on the surface of the base material due to the contact between the strip-shaped base material and the transport roll. .. Therefore, as one of the methods for solving this problem, a "floater" that injects gas or the like onto the lower surface of the base material and floats the band-shaped base material by the pressure is arranged, and the band-shaped base material is not a transport roll. A non-contact transfer device for transporting in a contact state has been developed.

However, in the non-contact transfer device using this floater, the strip-shaped base material is levitated and the frictional force due to the contact with the support does not work, so that the strip-shaped base material slides sideways to cause meandering or the strip-shaped base. It has been pointed out that there is a problem with the stability of the plate, such as the strip-shaped base material fluttering due to the airflow jetted to float the material. Therefore, many studies have been made to prevent meandering and fluttering of the floating strip-shaped base material and to stably transport the strip-shaped base material.

For example, as a meandering correction method, Patent Document 1 describes, in a method of transporting a strip-shaped base material using a floater that catenary-supports the strip-shaped base material in a non-contact manner by ejecting a gas, usually outside both width ends of the floater. By installing a side plate whose height is higher than the transport level of the strip-shaped base material, it is possible to transport the strip-shaped base material without contacting both width ends of the meandering strip-shaped base material with the side plate. A method has been proposed. However, in the floater of Patent Document 1, since the height of only the outermost side plate in the width direction of the base material is increased, the base material is returned to the center unless the strip-shaped base material causes a large meander. The driving force does not work. Therefore, when the meandering amount of the base material is small, there is a drawback that it is difficult to transport the strip-shaped base material in the center in the width direction.

On the other hand, in Patent Document 2, as a method of forcibly exerting a straightening force when the strip-shaped base material deviates from the center position, a gas jet nozzle is arranged above the floater and above the edge portion of the strip-shaped base material or A method of correcting meandering by blowing a high-pressure gas in the direction opposite to the displacement direction of the strip-shaped base material from below is disclosed. Further, Patent Document 3 discloses a method of correcting meandering by dividing the inside of the floater chamber and adjusting the gas pressure in the width direction.

Japanese Unexamined Patent Publication No. 06-107360 Japanese Unexamined Patent Publication No. 63-216928 Japanese Unexamined Patent Publication No. 04-007249

However, in the technique disclosed in Patent Document 2, since the gas is injected directly above the floater, there is a problem that the stable floating of the strip-shaped base material on the floater is adversely affected. Further, in the technique disclosed in Patent Document 3, the structure of the floater becomes complicated and the equipment cost increases. Further, since the pressure of the injected gas in the width direction is changed in order to correct the meandering, there is also a problem that the stable floating of the strip-shaped base material on the floater is adversely affected as in Patent Document 2.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a strip-shaped base material on the floater exit side in a non-contact transport device in which a strip-shaped base material is floated and transported by a floater. The purpose of the present invention is to propose a meandering control method for a strip-shaped base material that can stably suppress meandering.

The inventors have repeatedly studied the causes of meandering in order to solve the above problems. As a result, one of the causes of the meandering of the strip-shaped base material is the poor shape of the strip-shaped base material, and therefore, the shape of the strip-shaped base material before passing through the floater is measured, and based on the result, We have found that the meandering of the strip-shaped base material on the exit side (downstream side) of the floater can be reduced by moving the position in the width direction of the strip-shaped base material immediately before passing through the floater in the direction of preventing meandering in advance. Came to develop.

That is, in the present invention, gas is injected from one or more floater groups arranged below the continuously traveling strip-shaped base material onto the lower surface of the strip-shaped base material to float the band-shaped base material, and the strip-shaped base material is not in contact with the transport roll. In the method of controlling the meandering of the band-shaped base material in the non-contact type transporting device that conveys the strip-shaped base material in a state, the shape measuring device for measuring the shape of the strip-shaped base material and the meandering of the strip-shaped base material are on the upstream side of the floater group. An entry-side meandering meter for measuring the amount and a meandering control device for controlling the position of the strip-shaped base material in the width direction are arranged, and based on the shape measurement result of the strip-shaped base material obtained by the above-mentioned shape measuring device. The feature is that the meandering control device is operated and the through plate position of the strip-shaped base material on the upstream side of the floater group is moved in advance so that the meandering amount of the strip-shaped base material measured by the entry-side meandering meter becomes a predetermined value. We propose a meandering control method.

In the meandering control method of the present invention, the height distribution of the strip-shaped base material in the width direction is measured by the shape measuring device, and the direction and amount of the strip-shaped base material to be moved in advance are determined by the meandering control device based on the measured values. It is characterized by doing.

Further, in the meandering control method of the present invention, the elongation difference ratio distribution in the width direction of the strip-shaped base material is measured by the shape measuring device, and the strip-shaped base material is moved in advance by the meandering control device based on the measured value. It is characterized by determining the amount.

Further, in the meandering control method of the present invention, the meandering direction and amount of the strip-shaped base material downstream of the floater group are measured by the output side meandering meter installed on the downstream side of the floater group, and the measurement result is used to control the meandering on the upstream side of the floater group. It is characterized in that the direction and amount of moving the strip-shaped base material upstream of the floater group in advance by feeding back to the apparatus are corrected to the side of eliminating the meandering on the floater group grouping side.

Further, the meandering control method of the present invention is characterized in that the direction and amount of movement of the strip-shaped base material in advance by the meandering control device are determined by machine learning.

Further, in the meandering control method of the present invention, the data analyzed by the machine learning is at least one or more of the height distribution in the width direction of the strip-shaped base material and the elongation difference ratio distribution in the width direction of the strip-shaped base material. It is characterized by including one or more of the meandering direction and amount on the floater entry side and the meandering direction and amount on the floater exit side.

According to the present invention, the meandering direction and the meandering amount of the strip-shaped base material on the floater exit side caused by the shape are predicted based on the shape measurement result of the strip-shaped base material measured on the floater inlet side of the non-contact transfer device. However, since the position of the strip-shaped base material on the upstream side of the floater is moved in advance so as to cancel the meandering, the meandering of the strip-shaped base material on the downstream side of the floater can be reduced.
Further, according to the present invention, in the above method, the measurement result of the meandering meter installed on the downstream side of the floater is reflected in the determination of the moving direction and the amount of the through plate position of the strip-shaped base material on the upstream side of the floater. The amount of meandering on the downstream side of the floater can be further reduced.
Further, according to the present invention, in the above method, the direction and amount of the strip-shaped base material to be moved on the upstream side of the floater are determined by machine learning, so that the meandering amount on the downstream side of the floater is further reduced. can do.

This is an example of a side view of the floater used in the present invention. FIG. 5 is a cross-sectional view taken along the line AA of the floater shown in FIG. It is a figure explaining the meandering correction principle in the floater shown in FIGS. 1 and 2. It is a figure explaining the meandering generation mechanism caused by the height distribution (warp) in the width direction of a strip-shaped base material. It is a figure explaining the meandering generation mechanism caused by the elongation difference ratio distribution in the width direction of a strip-shaped base material. It is a figure explaining an example of the equipment row of the non-contact transfer apparatus used in this invention. It is a figure explaining the equipment row of the non-contact transfer apparatus used in the Example of this invention.

Hereinafter, embodiments of the present invention will be described.
In the present invention, gas is injected from one or more floater groups arranged below the continuously traveling strip-shaped base material onto the lower surface of the strip-shaped base material to levitate the strip-shaped base material so that it is in a non-contact state with the transport roll. When transporting the band-shaped base material, a shape measuring device for measuring the shape of the band-shaped base material, an inlet meander meter for measuring the meandering amount of the band-shaped base material, and a width of the band-shaped base material are on the upstream side of the floater group. A meandering control device that controls the position of the plate in the direction is provided, and the direction and amount of meandering that occurs while traveling on the floater is determined based on the shape measurement result of the strip-shaped base material obtained by the shape measuring device. A meandering control method characterized in that the through plate position of the strip-shaped base material on the upstream side of the floater group is moved in advance via the meandering control device installed on the upstream side of the floater group so as to predict and cancel the predicted meandering. Is.

As an example, FIG. 1 shows an example of a side view of a floater that floats and conveys a continuously traveling strip-shaped base material that can be suitably used in the present invention. This floater attempts to float and transport the band-shaped base material by injecting gas from below the band-shaped base material toward the lower surface of the band-shaped base material. Specifically, a floater 2 is arranged below the traveling strip-shaped base material 1, and the inside of the floater 2 is supplied with gas from a fan, a blower, or the like (not shown) to generate gas from atmospheric pressure. It is held at high pressure. The high-pressure gas inside the floater 2 is directed toward the lower surface of the strip-shaped base material from the slit-shaped gas outlet (slit nozzle) 5 provided on the top plate 6 above the floater and parallel to the width direction of the strip-shaped base material. Is ejected. The slit nozzles 5 are installed at two locations in the traveling direction of the strip-shaped base material, and the gas ejection directions are opposite to each other. Therefore, the gas ejected from the slit nozzle 5 is confined between the strip-shaped base material 1 and the top plate 6 on the floater to generate static pressure, and the static pressure causes the strip-shaped base material 1 to be supported in a floating state. NS.

FIG. 2 shows the AA cross section of the floater shown in FIG. A plurality of rib plates 4 are erected on the top plate 6 above the floater at intervals in the width direction of the strip-shaped base material, and the width of the gas injected from the slit nozzle 5 is widened by the rib plates 4. Since the outflow in the direction is suppressed and static pressure is generated between the strip-shaped base material 1 and the top plate 6, the strip-shaped base material 1 can be stably levitated. From the viewpoint of suppressing the outflow of the gas injected from the slit nozzle 5 in the length direction, the length of the strip-shaped base material is added to the rib plate 4 erected at intervals in the width direction. A plurality of rib plates may be erected at intervals in the longitudinal direction. Further, on both outer sides of the rib plate 4 erected at intervals in the width direction, that is, on both width ends of the top plate 6, the strip-shaped base material is higher than the rib plate 4 in order to prevent meandering. A high side plate 3 is erected.

Here, with reference to FIG. 3, the meandering correcting ability of the strip-shaped base material possessed by the floats shown in FIGS. 1 and 2 will be described. When the strip-shaped base material 1 meanders to one side (left side in FIG. 3), it occurs on the lower surface of the strip-shaped base material 1 because the gas flow path between the side plate 3 on the meandering side and the strip-shaped base material 1 becomes narrow. The static pressure becomes high. Therefore, the amount of levitation of the strip-shaped base material 1 on the meandering side becomes large, and the strip-shaped base material 1 is in an inclined state as shown in FIG. The static pressure acting on the lower surface of the strip-shaped base material 1 acts as a force in the direction perpendicular to the base material surface. This force can be divided into a vertical force vector and a horizontal force vector. The vertical force becomes a levitation force that supports the own weight of the band-shaped base material 1, and the horizontal force corrects the meandering of the band-shaped base material 1. It works as a correction force. That is, when the strip-shaped base material 1 on the floater is tilted, a component force of static pressure applied to the lower surface in the horizontal direction is generated, which is a force for correcting meandering. Therefore, on the floater, the strip-shaped base material 1 can be conveyed without continuing to meander.

However, in order for the meandering correction force as described above to work, the width end portion of the strip-shaped base material 1 needs to be sufficiently close to the side plate 3, and for that purpose, a certain amount of meandering needs to be generated. In other words, the above-mentioned conventional floater is effective for large meandering, but can hardly expect meandering correcting power for small meandering.

Therefore, as a result of repeated studies on the cause of the occurrence, including small meandering, the inventors have found that the shape defect of the strip-shaped base material is closely related.
The following two cases can be considered as the poor shape of the strip-shaped base material that causes meandering.
The first is a case where the strip-shaped base material is warped in the width direction and there is a height difference in the width direction of the strip-shaped base material, as shown in FIG. FIG. 4 shows a state in which the base material on the right side is largely drooped due to the downward warp generated in the strip-shaped base material. This state is the same as the meandering principle in the floater described above in FIG. 3, and the meandering force acts on the right side, and the strip-shaped base material meanders on the right side.

The second is the case where there is a difference in the elongation difference ratio in the width direction of the strip-shaped base material as shown in FIG. Normally, the strip-shaped base material is passed through while applying tension, but when there is a difference in the elongation difference ratio in the width direction of the strip-shaped base material, the tension applied to the side where the elongation difference ratio is small is large and the elongation difference ratio is large. Since the tension applied to the side with a large force is small, the side with a small stretch difference ratio hangs down and passes over the floater. FIG. 5 shows a hanging state because the elongation difference ratio on the right side is large. In this case as well, the right side of the strip-shaped base material passes over the floater in a state of hanging from the left side, so that the meandering force acts on the right side and the strip-shaped base material meanders to the right side.

However, the meandering caused by the poor shape of the strip-shaped base material is caused by, for example, measuring the shape of the strip-shaped base material with the shape measuring device 9 installed on the upstream side of the floater group 2 as shown in FIG. , The direction and amount of meandering of the strip-shaped base material on the floater 2 grouping side (downstream side) can be predicted. Therefore, the meandering control device 7 installed on the upstream side of the floater 2 group moves the through plate position of the strip-shaped base material on the upstream side of the floater 2 group in advance in the width direction so as to cancel the predicted meandering. It is considered that meandering on the swarm side can be suppressed.

Here, the shape measuring device 9 installed on the upstream side of the floater may be any as long as it can measure the height distribution in the width direction of the strip-shaped base material and / or the elongation difference ratio distribution in the width direction of the strip-shaped base material. Regardless of whether it is a contact type or a non-contact type, the detection accuracy is preferably 5 mm or less when measuring the height distribution and 0.05% or less when measuring the elongation difference ratio. Here, the elongation difference ratio is a difference in length (unit is%) of a strip-shaped base material such as a coil, and is synonymous with an ^{elongation difference (unit is I-unit (1 × 10-5)).}

For example, as a shape measuring device for measuring the height distribution in the width direction of the band-shaped base material, the surface of the band-shaped base material is irradiated with laser light or the like from above the band-shaped base material in a free state between the two transport rolls. Then, the reflected light is received and the distance from the light source is measured to measure the height distribution in the width direction in a non-contact manner, or the height in the width direction is measured from the distribution of the magnetic force of the electromagnetic coils arranged in the width direction. There is a method to measure the distribution.

Further, as a shape measuring device for measuring the distribution of the elongation difference ratio in the width direction of the strip-shaped base material, the difference in the length of the strip-shaped base material becomes a tension difference, and the contact pressure (vertical load) distribution generated on the contact roll surface is determined. A method of measuring the vertical load distribution of the contact roller with multiple sensors installed along the width direction on the roller surface, or a laser variation meter arranged at short intervals in the longitudinal direction of the base material with a line speedometer. It is possible to use a method of calculating by grasping the actual base material length and the mileage from the inclination of the long base material obtained from the above.

Further, as long as the meandering control device 7 installed on the upstream side of the floater can change the through-plate position in the width direction of the strip-shaped base material, the means thereof is not limited, but the responsiveness is fast. Preferably, for example, a steering type CPC (Center Position Control) device that changes the through plate position in the width direction by inclining (canting or skewing) a roll around which a strip-shaped base material is wound is suitable.

Here, the amount of shifting the through plate position of the band-shaped base material by the meandering control device in the width direction is W when the width of the band-shaped base material is W and the allowable range of the meandering amount of the band-shaped base material is W'. It is preferable to set it in the range of / 100 to W'. If the amount of shift exceeds W', meandering exceeding the permissible amount will be generated by itself, which is not preferable. On the other hand, if it is less than W / 100, it is within the range of the normal meandering amount, and there is no point in adjusting the through plate position in advance. More preferably, it is in the range of W / 80 to W ′ / 1.2.

Further, in the present invention, the meandering amount of the strip-shaped base material by the meandering control device is measured by the meandering meter 8a (entering side meandering meter) installed on the upstream side of the floater shown in FIG. Then, it is preferable to confirm whether or not the planned meandering amount is actually applied, and to feed the result back to the meandering control device. The method of the meandering meter is not particularly limited as long as the measurement accuracy of the meandering amount of the strip-shaped base material is 5 mm or less, and any method such as an optical type, an electromagnetic type, or an ultrasonic type may be used. good.

Further, as shown in FIG. 6, a meandering meter 8b (outside meandering meter) for measuring the meandering amount of the strip-shaped base material on the exit side of the floater is generally installed on the downstream side of the floater. However, in the present invention, it is preferable to further enhance the effect of suppressing meandering by feeding back the measurement result to the above-mentioned meandering control device 7 and reflecting it in the amount of fluctuation of the through plate position given on the floater entry side. For example, when the strip-shaped base material meanders to the right on the downstream side of the floater, meandering on the floater exit side when determining the direction and amount of moving the plate-passing position of the strip-shaped base material in the upstream side of the floater in the width direction. The amount of meandering on the exit side of the floater can be made smaller by shifting it in the direction of canceling (left side).

In addition, the strip-shaped base material may have a complicated shape. For example, when both the height distribution and the elongation difference ratio distribution exist in the width direction of the strip-shaped base material, and the meandering direction and the amount predicted from them conflict with each other, or in the width direction of the strip-shaped base material. , The case where the height and the elongation difference rate fluctuate in a complicated manner. In the case of such a complicated shape, it is preferable to compare the meandering predicted from the height distribution and the elongation difference ratio distribution and move to the side where the influence on the meandering is large, but it is often not possible to simply judge. ..

Therefore, it is preferable to utilize Machine Learning as a coping method in such a case. This machine learning is a kind of artificial intelligence (AI), and is a solution method for making a machine learn past data to discover and predict the rules, patterns, characteristics, etc. hidden in the data. Furthermore, when deep learning that enhances data analysis and learning is utilized by superimposing multiple layers of neural networks that refer to human nerves on the above machine learning, it is on the floater side. It is possible to further minimize the amount of meandering.

Here, the input data to be learned by the machine in the present invention includes the height distribution in the width direction and the elongation difference ratio distribution in the width direction of the strip-shaped base material, the meandering direction and the meandering amount on the floater entry side and exit side. , At least one or more of the height distribution in the strip-shaped base material width direction and the elongation difference ratio distribution in the strip-shaped base material width direction, and the meandering direction and the meandering amount of the strip-shaped base material on the floater entry side are preferably included. More preferably includes the meandering direction and the meandering amount of the strip-shaped base material on the exit side of the floater. Other input data may include the thickness and width of the strip-shaped base material, the material, the plate-passing conditions of the strip-shaped base material (plate-passing speed, applied tension, floater pressure, etc.) and the like.

As shown in FIG. 7, the floaters of FIGS. 1 and 2 are placed in series on a coating drying line equipped with a non-contact transfer device composed of five floaters arranged in series with a center-to-center distance of 10 m. A cold-rolled steel sheet of 0.3 mm x 1200 mm in width is passed through 100 tons (about 35.4 km) under various conditions shown in Table 1, and the absolute value of the amount of meandering is measured over the entire length with a meandering meter installed on the outlet side of the floater. Then, an experiment was conducted to evaluate the meandering correction ability under each sheeting condition from the average value.
At this time, the sheet passing speed of the steel sheet was set to 100 m / min, and the tension applied to the steel sheet ^{was set to 5.9 N / mm 2.} When passing a steel plate, the basic internal pressure of the floater is set to 0.6 kPa to eject gas from the slit nozzle, and the floating height of the steel plate (distance from the top of the rib plate to the average height in the width direction of the steel plate) is increased. The floater internal pressure was adjusted so as to be 25 mm.
In the non-contact transfer device used in the above experiment, the transfer roll 10 is arranged 10 m downstream from the center of the # 5 floater on the most downstream side of the floater group, and the meandering total 8b is arranged 1 m downstream thereof. The meandering control device 7 is 50 m upstream from the center of the most upstream # 1 floater of the floater group, the inlet meandering meter 8a is 5 m downstream from the meandering control device, and the meandering meter 8a is 3 m downstream from the meandering meter. A measuring device 9 is arranged.
Here, the meandering control device 7 is a steering type that skews a roll of φ800 mm wound with a cold-rolled steel sheet at 90 °, and the shape measuring device 9 measures the shape of 10 points in the width direction of the steel sheet with a laser. Then, from the results, a laser method that calculates the distribution of the elongation rate in the running direction of the steel sheet and the amount of warpage in the width direction of the steel sheet is used, and the meandering totals 8a and 8b are images of the edge of the steel sheet taken. We used a camera type that measures the amount of meandering by image processing.
The floater has a width of 1500 mm and a length of 1500 mm, and the top plate of the floater has two slit nozzles having a width of 20 mm and a length of 1500 mm along the width direction and 1100 mm in the length direction. It is provided with an interval of. Further, side plates having a height of 50 mm are erected at both width ends on the top plate of the floater, and further, a rib plate having a height of 25 mm is 100 mm in the width direction between the side plates. 14 sheets are erected with an interval, and 2 sheets are erected with an interval of 500 mm in the length direction.

Here, the various plate passing conditions shown in Table 1 will be described as No. Reference numeral 1 denotes a conventional technique (comparative example) in which the present invention is not applied and the meandering value measured by the meandering meter 8b on the floater exit side is not taken into consideration.
On the other hand, No. In 2 to 10, the amount of steel sheet movement upstream of the floater group is changed to three levels of ± 20 mm, ± 40 mm, and ± 80 mm, and at each level, the direction of steel sheet movement upstream of the floater group is set to the following three conditions. This is an example of the invention determined in.
-Determine based only on the elongation difference ratio distribution in the steel plate width direction measured by the shape measuring device installed upstream of the floater group (No. 2, 5 and 8).
-Determine based only on the height distribution in the steel plate width direction measured by the shape measuring device installed upstream of the floater group (No. 3, 6 and 9).
-Determine from both the elongation difference ratio distribution in the steel plate width direction and the height distribution measured by the shape measuring device installed upstream of the floater group (Nos. 4 and 10).
In addition, No. 11 to 13 are examples of inventions in which the amount of steel sheet moved upstream of the floater group is set to ± 40 mm, and the amount of steel sheet moved upstream of the floater group is changed under the following three conditions.
-Determining is made by adding the average meandering amount S on the exit side of the floater to the elongation difference ratio distribution in the steel plate width direction measured by the shape measuring device installed upstream of the floater group (No. 11).
-The height distribution in the width direction of the steel plate measured by the shape measuring device installed upstream of the floater group is determined by adding the average meandering amount S on the exit side of the floater (No. 12).
-Determining is made by further adding the average meandering amount S on the exit side of the floater to both the elongation difference ratio distribution and the height distribution of the steel sheet measured by the shape measuring device installed upstream of the floater group (No. 13).
In addition, No. In No. 14, the amount of movement of the steel plate in the upstream of the floater group was not set, and the elongation difference ratio distribution and the height distribution in the width direction of the steel plate measured by the shape measuring device installed in the upstream of the floater group were further added to the average meandering amount S on the exit side of the floater. This is an example of an invention in which the amount of moving steel plate in the upstream of the floater group is determined by deep learning of machine learning.

From Table 1, by applying the method of the present invention to move the through position of the steel sheet in the upstream of the floater group based on the elongation difference ratio distribution and the height distribution in the steel plate width direction to the prior art, the floater exit side The average meandering amount can be significantly reduced, especially when the meandering amount S on the floater outlet side is added to the elongation difference ratio distribution and height distribution in the steel sheet width direction to move the sheet passing position of the steel sheet upstream of the floater group. , It can be seen that the average meandering amount on the exit side of the floater can be further reduced. Further, when the sheet passing position of the steel sheet in the upstream of the floater group is moved by machine learning based on the elongation difference ratio distribution in the steel plate width direction, the height distribution, and the meandering amount S on the floater exit side, the average on the floater outlet side. It can be seen that the meandering amount can be reduced to less than 10 mm, which is 1/5 or less of that of the comparative example.

In the above embodiment, the case where the strip-shaped base material is a cold-rolled steel sheet has been described, but the technique of the present invention is not limited to the above-mentioned cold-rolled steel sheet, and is, for example, aluminum, copper or other metal. It can also be suitably applied to a strip-shaped base material such as paper and plastic film.

1: Band-shaped base material 2: Floater 3: Side plate 4: Rib plate 5: Slit nozzle opening 6: Floater top plate 7: Meander control device 8a, 8b: Meander meter 9: Shape measuring device 10: Conveyance roll

Claims (6)

Gas is injected from one or more floaters arranged below the continuously traveling strip-shaped base material onto the lower surface of the strip-shaped base material to levitate the strip-shaped base material so that it is in non-contact with the transport roll. In the meandering control method of the strip-shaped base material in the non-contact type transporting device for transporting
On the upstream side of the floater group, a shape measuring device for measuring the height distribution in the width direction of the strip-shaped base material and / or the elongation difference ratio distribution in the width direction of the strip-shaped base material, and an input for measuring the meandering amount of the strip-shaped base material. A side serpentine meter and a serpentine control device for controlling the position of the through plate in the width direction of the strip-shaped base material are arranged.
Based on the shape measurement result of the band-shaped base material obtained by the shape measuring device, the meandering control device is operated, and the meandering amount of the band-shaped base material measured by the entrance side meandering meter is the meandering amount of the band-shaped base material on the floater exit side. A meandering control method characterized in that the through-plate position of the strip-shaped base material on the upstream side of the floater group is moved in advance so that the meandering can be stably suppressed. The claim is characterized in that the height distribution in the width direction of the strip-shaped base material is measured by the shape measuring device, and the direction and amount of the strip-shaped base material to be moved in advance are determined by the meandering control device based on the measured value. The meandering control method according to 1. The claim is characterized in that the elongation difference ratio distribution in the width direction of the strip-shaped base material is measured by the shape measuring device, and the direction and amount of moving the strip-shaped base material in advance are determined by the meandering control device based on the measured value. Item 2. The meandering control method according to Items 1 and 2. The meandering direction and amount of the strip-shaped base material downstream of the floater group are measured by a meandering meter installed on the downstream side of the floater group, and the measurement result is fed back to the meandering control device on the upstream side of the floater group to upstream of the floater group. The meandering control method according to any one of claims 1 to 3, wherein the direction and amount of the strip-shaped base material to be moved in advance are corrected to the side that eliminates the meandering on the floater grouping side. The meandering control method according to any one of claims 1 to 4, wherein the direction and amount of the strip-shaped base material to be moved in advance by the meandering control device are determined by machine learning. The data analyzed by the above machine learning includes at least one or more of the height distribution in the width direction of the strip-shaped base material and the elongation difference ratio distribution in the width direction of the strip-shaped base material, and the meandering direction and amount on the floater entry side and the floater. The meandering control method according to claim 5, wherein one or more of the meandering direction and the amount on the exit side are included.

Images