JP7512946B2 - Metal strip flapping suppression device - Google Patents

Description

The present invention relates to a metal strip flutter suppression device that suppresses fluttering of a metal strip that occurs when the metal strip travels on a line.

Thin steel sheets used in automobiles, home appliances, etc. are generally manufactured from hot-rolled steel sheets through various processes to become cold-rolled steel sheets or surface-treated steel sheets. The manufacturing processes for these thin steel sheets include cold pickling, cold rolling, continuous or batch annealing, temper rolling, hot-dip galvanizing or electrolytic galvanizing. In the pass lines of the steel sheet manufacturing lines in these processes, there is a problem of flapping of the steel sheet, i.e. flapping of the metal strip, caused by fluctuations due to operating conditions such as tension fluctuations at high tension and shape fluctuations, which are unavoidable when the steel sheet passes through the line. For this reason, devices that suppress flapping of the metal strip are required in the pass lines.

Conventional techniques for solving the above problems are disclosed in, for example, Patent Documents 1 and 2. Patent Document 1 discloses a technique in which continuous or discontinuous grooves are provided in the rolls that come into contact with the steel sheet when the steel sheet is threaded along the circumferential direction of the roll barrel, with a pitch of 0.1 to 50 mm, a groove depth of 0.05 to 10 mm, and a groove width of 0.05 to 10 mm, thereby eliminating the air film or liquid film between the steel sheet and the roll, and further, by imparting a roughness of Ra: 0.3 to 10 μm to the roll surface, the gripping force between the steel sheet and the roll is improved, thereby suppressing fluttering of the steel sheet being transported.

Patent Document 2 proposes a technology to prevent flapping of slit material in a slitter line for obtaining slit material coils by winding slit material around a metal coil wound with a metal strip, by arranging a pair of flapping prevention rolls in front of (upstream of) the separator disk of the slitter line.

Japanese Patent Application Laid-Open No. 7-16636 Utility Model Registration No. 3174653

However, even if the technology of Patent Document 1 is applied to the metal strip running line (pass line) in the manufacturing process of thin steel sheets, as mentioned above, it is necessary to provide a groove of a specific shape on the roll that comes into contact with the steel sheet. In other words, groove processing or thermal spraying is required on the existing roll, and there is also the issue that the roll roughness decreases due to wear as the roll is used.

In addition, the technology in Patent Document 2 only places a pair of anti-flap rolls in front of the separator disk, so although flapping near the rolls is suppressed, the range of effect is small.

In addition, in the manufacturing process of thin steel sheets, adjacent objects such as devices for measuring the thickness and width of the metal strip and sensors for measuring the distance and material of the metal strip are installed adjacent to the metal strip. The metal strip runs through the gaps between these adjacent objects. As a result, there is a problem that the metal strip may flutter while running, causing it to sway in the width direction or up and down direction and come into contact with adjacent objects, resulting in a decrease in the quality of the metal strip or damage to the adjacent objects. For this reason, there is a demand for the running metal strip to pass through the gaps without coming into contact with the adjacent objects.

The present invention aims to solve the problems caused by the fluttering of the metal strip on the metal strip traveling line described above, specifically, problems such as contact with adjacent objects due to the fluttering of the metal strip when the metal strip passes through gaps between adjacent objects around the metal strip traveling line, and deterioration of the metal strip quality and damage to equipment due to such contact. The present invention aims to provide a metal strip flutter suppression device that can guarantee the quality of the traveling metal strip.

The inventors conducted extensive research to solve the above problems and came to the following conclusions.

To prevent contact between a traveling metal strip and adjacent objects around the metal strip traveling line, it is effective to install support rolls at least in three locations upstream and downstream of the equipment to be prevented from contacting. In particular, at least one of the support rolls is a split roll (described below as a "back support roll") that is split in the width direction of the metal strip and is placed on both sides of an adjacent object (e.g., a non-contact sensor that measures the distance to the metal strip) and the other support rolls are non-split rolls (described below as a "front support roll") that are placed at least one each before and after (upstream and downstream) the traveling direction of the metal strip relative to the adjacent object. The support rolls, consisting of split rolls and non-split rolls arranged in this way, can suppress the flapping of the metal strip while it is traveling by pressing it from two directions, the front side and the back side.

In addition, the roll push-in amount of these support rolls can be varied, making it possible to adjust the push-in amount appropriately depending on the operating conditions. Furthermore, by arranging two non-divided rolls within a specified range from the adjacent objects, the effect of suppressing flapping of the metal strip due to tension fluctuations and shape fluctuations can be increased. As a result, the effect of suppressing flapping of the metal strip can be obtained more effectively.

The present invention has been made based on the above findings, and the gist of the present invention is as follows.
[1] A metal strip flutter suppression device that is provided in a metal strip traveling line along which a metal strip is threaded, and suppresses fluttering of the metal strip passing through a gap between adjacent objects arranged around the metal strip traveling line, comprising:
A support roll is provided for pressing the metal strip at at least three points,
The support rolls are divided in the width direction of the metal strip on the back side of the metal strip, and at least one pair of back support rolls are arranged on both ends of the adjacent objects;
and at least one surface support roll disposed on the surface side of the metal strip and in front of and behind the adjacent object in the running direction of the metal strip,
A metal strip flutter suppression device, in which the back support roll and the front support roll are arranged with their respective roll central axes offset in the line direction.
[2] The metal strip flutter suppression device according to [1], wherein the pressing amount of the support roll is variable.
[3] The metal strip flutter suppression device according to [1] or [2], wherein the front surface support roll is disposed within 1000 mm upstream of the back surface support roll and within 1000 mm downstream of the adjacent object.

The present invention uses three or more support rolls consisting of a combination of split rolls and non-split rolls to suppress flapping of the metal strip passing through gaps between adjacent objects (equipment) arranged around the metal strip running line. This prevents the metal strip from coming into contact with other equipment around the metal strip running line, preventing damage to other equipment and impairing the appearance quality of the metal strip.

FIG. 1 is a schematic diagram illustrating an example of a general equipment configuration in a continuous annealing line for producing cold-rolled steel sheets. FIG. 2 is a schematic diagram for explaining an example of the equipment configuration of a continuous annealing line having a metal strip fluttering suppression device according to the present invention. FIG. 3 is a schematic view of the metal strip fluttering suppression device in the continuous annealing line shown in FIG. 2 as viewed from the longitudinal direction of the steel sheet. FIG. 4 is a diagram showing the amount of displacement of the steel sheet in the width direction of the steel sheet when the support rolls of the metal strip flutter suppression device of the present invention are used and when they are not used. FIG. 5 is a diagram showing the amount of displacement of a steel plate in the longitudinal direction of the steel plate when no support rolls are used in the metal strip flutter suppression device of the present invention. FIG. 6 is a diagram showing the amount of displacement of a steel sheet in the longitudinal direction of the steel sheet when the support rolls of the metal strip flutter suppression device of the present invention are used. FIG. 7 is a table showing the results of the presence or absence of contact between the non-contact sensor and the metal strip when the support roll of the metal strip flutter suppression device of the present invention is used and when it is not used.

One embodiment of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to this embodiment.

First, the metal strip flutter suppression device of the present invention will be described with reference to Figures 1 to 3. Figure 1 shows an example of the equipment configuration of a typical continuous annealing line for cold-rolled steel sheets, and Figures 2 and 3 show an example of the equipment configuration of a continuous annealing line for cold-rolled steel sheets having the metal strip flutter suppression device of the present invention. Figures 1 and 2 are side views of the above equipment configuration, and Figure 3 is a front view of the metal strip flutter suppression device as viewed from the longitudinal direction of the steel sheet.

Here, the equipment configuration shown in Fig. 1 and Fig. 2 is installed in a continuous annealing line for producing cold-rolled steel sheets. The outline of the equipment configuration shown in Fig. 1 and Fig. 2 is, for example, that a deflector roll 4 is arranged at the exit side of an annealing furnace (not shown), and a steering roll 5 is arranged behind (downstream) this deflector roll 4. Between the deflector roll 4 and the steering roll 5, non-contact sensors 6 are arranged on the front side and back side of the metal strip 1, respectively, and the metal strip 1 passes between these non-contact sensors 6. The distance between the two non-contact sensors 6 (i.e., in the example shown in Fig. 1, the distance between the outer surface of the non-contact sensor 6a on the front side of the metal strip and the outer surface of the non-contact sensor 6b on the back side of the metal strip opposite to this surface) is 44 mm. The non-contact sensor 6 measures the distance to the traveling metal strip 1 on the front and back sides of the metal strip 1, and measures the material of the metal strip. As shown in Figures 1 and 2, the continuously annealed metal strip 1 (steel sheet) is deflected horizontally by a deflector roll 4, and the steel sheet is sent between non-contact sensors 6 to a steering roll 5. Note that the "front side" and "back side" in the above "front side and back side of metal strip 1" can be determined arbitrarily. In this embodiment, the upper surface of metal strip 1 shown in Figure 1 etc. is the "front side", and the lower surface of metal strip 1 is the "back side".

In addition to the above configuration, in the equipment configuration shown in FIG. 2, the metal strip flutter suppression device 10 of the present invention is arranged to support the metal strip upstream and downstream of the equipment (here, the non-contact sensor 6) that prevents contact with the metal strip.

In the case of the general equipment configuration shown in Figure 1, the non-contact sensors 6 arranged above and below the metal strip 1 may come into contact with the metal strip 1 due to flapping of the steel strip (metal strip flapping) that occurs due to fluctuations in operating conditions such as fluctuations in steel strip tension and shape that are unavoidable when the strip is threaded on the line. The distance between the two non-contact sensors 6 is narrow, at 44 mm. When threading the strip through this narrow range, the example shown in Figure 1 was not able to adequately deal with the fluctuations in the metal strip 1 caused by flapping of the steel strip.

Therefore, in the present invention, it is important to provide a metal strip flutter suppression device 10 as shown in Figures 2 and 3 in order to suppress the fluttering of the steel sheet during the above-mentioned sheet threading.

As shown in Figures 2 and 3, the metal strip flutter suppression device 10 of the present invention is installed between the deflector roll 4 and the steering roll 5, and around the two non-contact sensors 6 (hereinafter sometimes referred to as the first non-contact sensor 6a and the second non-contact sensor 6b).

The metal strip flutter suppression device 10 has at least three support rolls. Specifically, it is composed of two surface support rolls 2 (hereinafter sometimes referred to as the first surface support roll 2a and the second surface support roll 2b) arranged on the surface side of the metal strip 1 and on the upstream and downstream sides of the first non-contact sensor 6a, and one back support roll 3 arranged on the back side of the metal strip 1 and sandwiching the second non-contact sensor 6b. The surface support roll 2 is a non-divided roll. The back support roll is a divided roll. Specifically, the back support roll 3 is a roll (hereinafter referred to as a "centrally divided back support roll") that is divided in the center so as to sandwich the second non-contact sensor 6b on both ends of the second non-contact sensor 6b when viewed from the longitudinal direction of the steel sheet as shown in FIG. 3. The centrally divided back support roll 3 is divided because the second non-contact sensor 6b is arranged in the center part of the sheet width direction of the metal strip 1. As shown in FIG. 3, the centrally divided back surface support roll 3 has a roll lifting function that allows the roll to be raised and lowered by an air cylinder 7 provided below the roll. By raising and lowering the centrally divided back surface support roll 3 with the air cylinder 7, the centrally divided back surface support roll 3 rises and the back surface of the metal strip 1 is pressed by the roll. This controls the amount of pressing (intermesh amount) of the metal strip 1 by each of the support rolls 2, 3 on the front and back sides of the metal strip 1.

As shown in Figure 7 below, when the support roll is used alone without using the front surface support roll 2 and the centrally divided back surface support roll 3 (conditions 1 and 2 in Figure 7), fluttering is not suppressed on the one side of the metal strip 1 where the support roll is not used, because there is no restraint by the support roll.

On the other hand, even if a front support roll 2 and a centrally divided back support roll 3 are used, if the central axes of the front and back support rolls are positioned in the same line direction when viewed from the side, that is, if they are treated like pinch rolls, the metal band will vibrate between the pinch rolls (i.e., between the support rolls on the front and back sides) when flapping due to tension fluctuations, and the range of vibration suppression for the metal band will be narrow.

Therefore, in the present invention, as shown in FIG. 2, it is important to install the support rolls 2 and 3 at offset positions in the line direction on the front and back sides of the metal strip 1, respectively, and to maintain the restraint by the support rolls 2 and 3. When the support rolls 2 and 3 are installed with offset positions in this way (condition 3 in FIG. 7), the vibration of the metal strip is suppressed, and the number of contacts with the non-contact sensor 6 was zero. That is, since two front support rolls 2 that press the metal strip 1 from the front side of the metal strip 1 and one centrally divided back support roll 3 that presses the metal strip 1 from the back side of the metal strip 1 are installed, when the pressing positions of the support rolls 2 and 3 are within a range narrower than the gap of the non-contact sensor 6, the metal strip 1 passes along the support rolls 2 and 3, so that contact can be prevented. As a result, the flapping of the steel sheet during passing can be suppressed in a wide range between the support rolls 2 and 3.

In the present invention, in order to obtain such an effect, for example, the front surface support roll 2 and the centrally divided back surface support roll 3 are preferably rolls having a diameter of 150 mm and lined with polyurethane. In addition, the length of the front surface support roll 2 is preferably equal to or greater than the width of the metal strip passing through the line. The length of the centrally divided back surface support roll 3 is preferably equal to or greater than 500 mm for each divided roll.

The above-described configuration provides the effect of suppressing flapping of the metal strip. In the present invention, the following configuration may be further provided to obtain this effect even more advantageously.

The metal strip flutter suppression device 10 of the present invention can vary the amount of pressure applied to the support rolls (front surface support roll 2 and centrally divided back surface support roll 3) to allow the traveling metal strip 1 to pass through the gaps between adjacent objects (e.g., non-contact sensor 6) around the metal strip travel line without contacting the adjacent objects. By varying the amount of pressure applied, the difference in the degree of fluttering of the metal strip that occurs under various conditions can be appropriately controlled.

For example, when the shape of the metal strip 1 varies greatly, if the pushing amount of the front support roll 2 and the centrally divided back support roll 3 is fixed and excessively large, there is a concern that the metal strip 1 will exceed the gap between the adjacent objects (e.g., the non-contact sensor 6) and come into contact between the support rolls 2 and 3. In this case, by reducing the pushing amount of the support rolls 2 and 3, it is possible to control the metal strip 1 so that it does not exceed the gap between the adjacent objects. The pushing amount is appropriately controlled by the roll lifting function of the air cylinder 7. When the air cylinder 7 is raised, the roll pushing into the metal strip 1 increases, suppressing contact between the back surface of the metal strip 1 and the non-contact sensor 6. On the other hand, when the air cylinder 7 is lowered, the roll pushing into the metal strip 1 decreases, suppressing contact between the surface of the metal strip 1 and the non-contact sensor 6.

As described above, the metal strip flutter suppression device 10 of the present invention maintains the restraint of the metal strip 1 by offsetting the front support roll 2 and the centrally divided back support roll 3. Furthermore, in order for the metal strip 1 to pass through the gaps between the equipment (adjacent objects) adjacent to the metal strip 1 without coming into contact with them, it is preferable to install the front support rolls 2 (first front support roll 2a, second front support roll 2b) within a range of 1000 mm on the upstream and downstream sides (front and rear sides in the direction of travel of the metal strip) of the adjacent objects. In other words, the front support rolls 2 are each positioned within 1000 mm upstream of the back support roll and within 1000 mm downstream of the adjacent object.

When the metal strip 1 passes through the gap between adjacent objects (e.g., non-contact sensor 6), the closer the distance between the support rolls 2 and 3 on the front and back sides of the metal strip and the adjacent objects, the greater the effect of suppressing fluttering of the metal strip 1 due to shape and tension fluctuations. Furthermore, if the distance between the support rolls 2 on the front side of the metal strip is wide, the frequency of fluttering of the metal strip 1 between the support rolls 2 and 3 on the front and back sides of the metal strip decreases due to the metal strip being restrained by the roll pressing. However, the amplitude of the fluttering increases, and there is a concern that the metal strip 1 may come into contact with the adjacent objects in the gap between the adjacent objects. If the first and second surface support rolls 2a and 2b on the front side of the metal strip and the adjacent objects whose contact should be suppressed are installed within a range of 1000 mm or less, the fluttering amplitude of the metal strip 1 becomes sufficiently small. For this reason, it is preferable to arrange the first and second surface support rolls 2a and 2b within the above range. More preferably, it is within 500 mm.

Next, the operation and effects of the present invention will be specifically explained with reference to Figures 4 to 6.

First, an explanation will be given using Figure 4. Figure 4 shows the amount of steel plate displacement of the metal strip 1 when the support rolls 2, 3 of the metal strip flutter suppression device 10 of the present invention are in use and when they are not in use in the annealing line shown in Figure 2. In Figure 4, the vertical axis shows the amount of steel plate displacement (mm), and the horizontal axis shows the amount of steel plate displacement in the width direction of the steel plate.

As shown in FIG. 4, the conditions for using each support roll of the metal strip flutter suppression device 10 are that the front support roll 2 and the centrally divided back support roll 3 have the roll position as the pass line position. As described above, the distance between the two non-contact sensors 6 on the top and bottom sides of the metal strip 1 is 44 mm, so the distance between the pass line and each contact sensor 6 is 22 mm. The dotted line in FIG. 4 indicates the position of the bottom surface of the second non-contact sensor 6b.

Here, the three support rolls 2, 3 of the metal strip flutter suppression device 10 are arranged with a staggered arrangement. Specifically, the first front surface pass roll 2a is installed within a range of 500 mm in the upstream direction from the upstream end of the first non-contact sensor 6a, and the second front surface pass roll 2b is installed within a range of 500 mm in the downstream direction from the downstream end of the first non-contact sensor 6a. In addition, the divided back surface pass roll 3 is arranged at the center position of the non-contact sensor 6.

As shown in Figure 4, when the metal strip 1 was passed through without using the support rolls 2 and 3, the flutter amplitude of the metal strip 1 exceeded 22 mm in the entire width direction. It can be seen that the metal strip 1 was in contact with the second non-contact sensor 6b over its entire range, including both ends and the center, while it was running. In addition, the metal strip 1 was displaced within a range of 4 to 24 mm, with large fluttering. This is thought to be due to the fact that the support rolls 2 and 3 were not able to suppress the metal strip flutter caused by tension fluctuations and line deceleration.

In contrast, when the metal strip 1 was passed through the support rolls 2 and 3, the flutter amplitude of the metal strip 1 was within 20 mm in the entire width direction. It can be seen that the metal strip 1 was not in contact with the second non-contact sensor 6b while traveling. The metal strip 1 was displaced within a range of 12 to 20 mm, with little flutter. It is believed that the roll pressing of the support rolls 2 and 3 suppressed the flutter of the metal strip and reduced the amount of displacement of the steel sheet.

In other words, when the support rolls are used, the fluttering of the steel sheet caused by the fluctuations in tension and shape of the steel sheet, which are unavoidable when the sheet is threaded through the line, is suppressed compared to when the support rolls are not used, and the amount of displacement of the steel sheet is reduced. This shows that the above action has significantly reduced contact between the non-contact sensor 6 and the metal strip 1.

Next, explanation will be given using Figures 5 and 6. Figures 5 and 6 show the amount of steel sheet displacement of the metal strip 1 when the support rolls 2, 3 of the metal strip flutter suppression device 10 of the present invention are in use and when they are not in use in the annealing line shown in Figure 2. Figures 5 and 6 show the amount of steel sheet displacement (mm) in the longitudinal direction of the steel sheet of the metal strip 1. As in Figure 4, the roll positions of the front surface support roll 2 and the centrally divided back surface support roll 3 are set as the pass line positions as the conditions when each support roll is in use. The dotted lines in each figure indicate the position of the underside of the second non-contact sensor 6b.

Here, the three support rolls 2 and 3 of the metal strip flutter suppression device 10 are staggered, and the specific conditions are the same as those in Figure 4.

As shown in Figure 5, when the metal strip 1 was passed through without the support rolls 2 and 3 in use, the metal strip 1 fluttered significantly overall due to line deceleration and tension fluctuations. The metal strip 1 was displaced within a range of 0 to 28 mm, and the flutter amplitude was large. There were also locations where the displacement from the pass line exceeded 22 mm, indicating that the metal strip 1 had come into contact with the second non-contact sensor 6b. This is thought to be due to the fact that the support rolls 2 and 3 were not able to suppress the metal strip flutter.

In contrast, as shown in Figure 6, when the metal strip 1 was passed through the support rolls 2 and 3, fluttering was suppressed. The displacement of the metal strip 1 was within the range of 12 to 18 mm, and the fluttering amplitude was suppressed to a nearly constant level. It can be seen that the metal strip 1 was not in contact with the second non-contact sensor 6b while traveling. This is thought to be because the roll pressing of the support rolls 2 and 3 suppressed the fluttering of the metal strip, reducing the displacement of the steel sheet.

In other words, similar to the evaluation of the steel plate width direction described above, the use of support rolls suppresses the fluttering of the steel plate, making the steel plate displacement smaller than when support rolls are not used, while also reducing the variation in the displacement. When support rolls are not used, the steel plate displacement fluctuates by a maximum of 28 mm, but by using support rolls, the variation in the steel plate displacement is suppressed to 6 mm.

As mentioned above, the flapping of the metal strip is caused by the inevitable fluctuations in the tension and shape of the steel sheet when it is threaded through the line. Therefore, it is particularly preferable to apply the metal strip flapping suppression device of the present invention to a manufacturing line for high-strength cold-rolled steel sheet (hi-tensile). Specifically, it can be applied to a manufacturing line for steel sheet with a tensile strength of 270 MPa or more. There is no particular upper limit to the tensile strength, but it may be, for example, 1470 MPa or less.

As described above, according to the present invention, the fluttering of the metal strip, which occurs due to fluctuations in operating conditions such as tension fluctuations and shape fluctuations that are unavoidable when the metal strip is threaded through a line, is suppressed by the front support roll 2 and the centrally divided back support roll 3. By bringing these support rolls 2 and 3 into contact with the metal strip 1 and applying a pressing force thereto, the shape of the metal strip 1 is corrected and the metal strip 1 is restrained between the respective support rolls 2 and 3. This makes it possible to suppress the fluttering of the metal strip.

In addition, by installing the device of the present invention, which has a relatively inexpensive structure, it is possible to reduce the variation in steel plate displacement amount in response to the unavoidable fluctuations in metal strip tension and shape as described above. Therefore, by using the device of the present invention, it is possible to reduce installation costs and construction time compared to applying conventional devices.

The action and effect of the present invention will be explained using examples. Note that the present invention is not limited to the following examples.

In this example, cold-rolled steel sheets were manufactured in a continuous annealing line that produces cold-rolled steel sheets. The continuous annealing line was equipped with an equipment configuration including a metal strip flutter suppression device 10 of the present invention as shown in Figure 2. Each roll position was set to a pass line position. The distance between the non-contact sensors 6 (adjacent objects) was set to 44 mm.

In this continuous annealing line, the support rolls 2 and 3 were controlled under the conditions shown in Figure 7 to pass the metal strip 1 (steel sheet) through, and the number of times the metal strip 1 came into contact with an adjacent object (non-contact sensor 6) was measured. Here, the tensile strength of the metal strip was set to 270 to 1470 MPa. The first and second surface support rolls 2a and 2b were installed within 500 mm of the non-contact sensor 6 on the upstream and downstream sides, respectively.

Figure 7 shows the results of sorting out whether or not there is contact between the non-contact sensor 6 and the metal strip 1 depending on the combination of the front support roll 2 and the centrally divided back support roll 3.

Condition 1 is the result when only the centrally divided back support roll 3 of the metal strip flutter suppression device 10 of the present invention is used. Condition 2 is the result when only the two front support rolls 2a, 2b of the device 10 are used. Condition 3 is the result when the three support rolls consisting of the centrally divided back support roll 3 and the two front support rolls 2a, 2b of the device 10 are arranged in a staggered manner. In condition 3, the three support rolls were arranged under the same conditions as those in Figure 4 above.

In the case of condition 1, the first non-contact sensor 6a came into contact with the surface of the steel sheet, and in the case of condition 2, the second non-contact sensor 6b came into contact with the back surface of the steel sheet. This contact occurred because the steel sheet was not held by the respective support rolls when the tension of the steel sheet on the line fluctuated. This shows that support rolls must be used to sandwich the steel sheet on both the front and back surfaces.

On the other hand, in the case of condition 3, the support rolls 2 and 3 on both sides of the steel plate were offset, so that the fluttering caused by fluctuations in the tension of the steel plate on the line and the deformation in the gap of the non-contact sensor 6 were restrained by the support rolls 2 and 3, and the number of contacts between the non-contact sensor 6 and the metal strip 1 was zero.

REFERENCE SIGNS LIST 1 Metal strip 2 Surface support roll 3 Center-divided back support roll 4 Deflector roll 5 Steering roll 6 Non-contact sensor 7 Air cylinder 10 Metal strip flutter suppression device

Claims (3)

A metal strip flutter suppression device that is provided on a metal strip traveling line along which a metal strip is passed, and that suppresses fluttering of the metal strip passing through a gap between adjacent objects arranged on each of the front side and back side of the metal strip traveling line,
The metal strip is supported by four support rolls.
The support rolls are divided on the back side of the metal strip in the width direction of the metal strip, and at least one pair of back support rolls are arranged on both ends of the adjacent back side in the width direction of the metal strip ;
and at least one surface support roll disposed on the surface side of the metal strip and in front of and behind the adjacent object on the surface side in the running direction of the metal strip,
A metal strip flutter suppression device, in which the back support roll and the front support roll are arranged with their respective roll central axes offset in the line direction. The metal strip flutter suppression device according to claim 1, in which the pressing amount of the support roll is variable. The metal strip flutter suppression device according to claim 1 or 2, wherein the front surface support roll is positioned within 1000 mm upstream from the back surface support roll and within 1000 mm downstream from the adjacent object.

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