JP2017094379A - Loop car, looper facility, and steel plate storage method using looper facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loop car capable of preventing a steel plate from meandering within looper facilities, the looper facilities comprising the loop car, and a steel plate storage method using the looper facilities.SOLUTION: A loop car for use in looper facilities for making a steel plate pass between rolls to store it, can move along a longitudinal direction of the steel plate. The loop car includes a drum roll that changes a conveyance direction of the steel plate by winding the steel plate around it, and a support roll that is provided on the entrance side of the drum roll to support an undersurface of the steel plate.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a loop car capable of preventing meandering of a steel plate in a looper facility, a looper facility provided with the loop car, and a steel plate storage method using the looper facility.

  When performing processing such as pickling, plating, rolling, cleaning, and heating of a steel plate in a continuous processing line, the steel plate is passed through the processing portion after the steel plate is welded at the welding portion. Usually, a looper facility is installed between the welded portion and the processing portion. The looper facility is a facility for storing a steel plate therein so that a desired amount of the steel plate can always be supplied to the processing portion regardless of fluctuations in the plate passing speed in the welded portion or the like. In the looper facility, the steel plate is passed in a reciprocating manner.

  A horizontal looper facility 1 in which a steel plate is passed in a horizontal direction (horizontal direction) will be briefly described with reference to FIG. In the continuous processing line, the steel plate 12 unwound from the steel plate coil 2 by the uncoiler 9 is welded by the welder 5 and then enters the looper equipment 1 while changing the plate passing direction by the loop car 7 and the fixed roll 8. It passes through the processing section on the exit side. Adjustment of the storage amount of the steel plate 12 in the looper facility 1 is performed by moving the loop car 7 in the horizontal direction along the longitudinal direction of the steel plate 12.

  The continuous processing line reaches several hundred meters or more in terms of the length in the longitudinal direction of the steel plate 12 from the uncoiler 9 to the processing section. As the length of the steel plate 12 to be passed increases, the tension applied to the steel plate 12 is locally insufficient, and problems such as bending and meandering of the steel plate are more likely to occur. Moreover, the same problem is likely to occur as the width of the steel plate increases.

  If the meandering of the steel plate 12 is significant, the edge portion of the steel plate 12 comes into contact with other equipment or the like, causing a problem that the edge portion is damaged. Conventionally, various methods have been tried to prevent meandering in the looper facility 1.

  For example, a technique for giving a steering function to a fixed roll is known. Specifically, a technique for controlling the inclination angle of a fixed roll in a looper facility using a sensor and a hydraulic device is known. By adjusting the inclination angle of the fixed roll, centering of the steel sheet can be promoted and meandering can be prevented.

  A technique for providing a meandering prevention roll between a fixed roll and a loop car is also known. As an example of a meandering prevention roll, a split-type roll formed by a plurality of rolls arranged in the width direction of a steel plate is known. By adjusting the inclination angle of these rolls, the steel sheet can be moved from both ends in the width direction to the center. Patent document 1 is mentioned as a literature which disclosed the above techniques.

Japanese Unexamined Patent Publication No. 03-198907

  However, it is impossible to completely prevent meandering of the steel plate in the looper facility by providing a steering function to the fixed roll as described above or providing a meandering prevention roll between the fixed roll and the loop car. There's a problem.

  According to the study by the present inventors, the meandering of the steel plate in the looper equipment is likely to occur at a position away from a bridle roll that gives tension to the steel plate, a fixed roll having a steering function, etc. It has been found that it is sometimes prone to occur.

  Further, when a steel plate having a large plate width (for example, a steel plate having a plate width of about 1650 mm or more and about 1900 mm or less) is passed, the problem of meandering becomes particularly noticeable. Conventionally, when passing a steel plate with a large plate width, the loop car is moved closer to the fixed roll, and the length of the steel plate stored in the looper facility is shortened (reducing the amount of steel plate stored). Occurrence is prevented. However, if the storage amount of the steel plate in the looper facility is reduced, the productivity of the entire continuous processing line is reduced accordingly. That is, conventionally, when a steel plate having a large plate width is continuously processed, there has been a problem that the processing amount is restricted in order to prevent the meandering of the steel plate.

  The present invention has been completed in view of the above problems, and in particular, a loop car capable of preventing the meandering of the steel sheet in the looper equipment by supporting the steel sheet on the entrance side of the loop car, including the loop car. It is an object of the present invention to provide a looper facility and a method for storing a steel plate using the looper facility.

Means of the present invention are as follows.
[1] A loop car used in a looper facility for passing and storing a steel plate between rolls and movable along the longitudinal direction of the steel plate, the drum roll winding the steel plate and changing the transport direction of the steel plate, A loop car comprising: a support roll provided on an entry side of the drum roll and supporting a lower surface of the steel plate.
[2] The loop car according to [1], wherein the support roll supports a lower surface of the steel sheet so that an angle of entry of the steel sheet into the drum roll is 15 ° or less.
[3] The loop car according to [1] or [2], wherein the support roll is provided with a rubber lining.
[4] Looper equipment for passing and storing a steel plate between rolls, provided at one end in the longitudinal direction, and a fixed roll in which the longitudinal position of the steel plate is fixed in the passing plate, and the other end in the longitudinal direction A loop car that is movable in the longitudinal direction of the steel sheet, and the loop car is the loop car according to any one of [1] to [3] Looper equipment to do.
[5] The looper facility according to [4], wherein the looper facility is a horizontal looper facility through which a steel plate is passed in a horizontal direction.
[6] A method for storing a steel sheet, comprising storing the steel sheet by passing it through the looper facility according to [4] or [5].
[7] The steel plate storage method according to [6], wherein a steel plate having a plate width of 1650 mm or more and 1900 mm or less is stored.

  According to the present invention, meandering of a steel plate can be prevented by supporting the steel plate from the lower surface at the loop car entrance side in the looper facility. Thereby, also when passing a steel plate with a large board width, the restriction | limiting of the storage amount reduction | decrease in a looper installation can be eased, and the productivity of a continuous processing line can be improved.

FIG. 1 is an explanatory diagram showing an outline of the present invention. FIG. 2 is an explanatory diagram of the loop car.

  First, the continuous processing line of the steel plate 12 provided with the looper equipment 1 which concerns on this invention is demonstrated using FIG.

  First, the steel plate coil 2 is rewound by the uncoiler 9 and the steel plate 12 is fed into the line. While the steel plate 12 is fed out by the leveler 3, the longitudinal end thereof is cut by the subsequent shear 4. The welder 5 is provided at the rear stage of the shear 4 and enables continuous threading by welding the rear end of the preceding plate and the front end of the succeeding plate. The welded steel plate 12 passes through the looper equipment 1 while being tensioned by a bridle roll 6a provided on the entrance side of the looper equipment 1 and a bridle roll 6b provided on the exit side of the looper equipment 1. Boarded.

  The steel plate 12 passed through the looper facility 1 is wound around a drum roll (not shown in FIG. 1) in the loop car 7a to change the conveying direction. Next, the steel plate 12 is wound around the fixed roll 8a and the conveyance direction is changed again. Similarly, the steel plate 12 is wound around the loop car 7b and the fixed roll 8b in order and passed through the outside of the looper facility 1 while changing the conveying direction. In the example of FIG. 1, the fixed roll 8 b includes two rolls. One roll is provided inside the looper equipment 1 and the other roll is provided outside the looper equipment 1. Thus, the steel plate 12 reciprocates between the loop cars 7a, 7b and the fixed rolls 8a, 8b arranged at both ends in the longitudinal direction in the looper facility 1 (left and right in the case of a horizontal looper facility). Is stored in the looper facility 1.

  On the exit side of the looper facility 1, the steel sheet 12 is subjected to shape correction by the tension leveler 10 under the adjustment of the tension by the bridle roll 6b and the bridle roll 6c, and then passed through the processing section to perform various processes. Is called. For example, pickling, plating, rolling, cleaning, heating, and the like are performed in the processing unit.

  When the steel plate 12 is welded by the welder 5, the stop of the plate passing or the decrease of the plate passing speed may occur on the entry side of the looper facility 1. As described above, the storage amount of the steel plate 12 can be adjusted by the looper facility 1 so that a desired amount of the steel plate 12 can be supplied to the processing section even when the fluctuation of the sheet passing speed occurs on the entry side of the looper facility 1. Done.

  The storage amount of the steel plate in the looper facility 1 is adjusted by reciprocating the loop cars 7 a and 7 b along the plate passing direction of the steel plate 12. The loop cars 7 a and 7 b have wheels at the lower part, and the reciprocating motion of the loop cars 7 a and 7 b is performed by the driving device 13 connected to the wire 11. For example, in FIG. 1, when reducing the storage amount of the steel plate 12 in the looper facility 1, the loop car 7 is moved closer to the fixed roll 8 (moved to the left in the drawing), and when increasing the storage amount of the steel plate 12, The loop car 7 is moved away from the fixed roll 8 (moved to the right in the drawing).

  In the example shown in FIG. 1, two loop cars 7 are provided in the looper facility 1, but the number of loop cars 7 may be one or three or more. Further, the number of fixed rolls can be appropriately changed according to the number of loop cars 7. When a plurality of loop cars 7 are provided, these loop cars 7 may reciprocate synchronously or may reciprocate separately.

  The fixed roll 8 winds the steel plate 12 at a fixed position without moving along the longitudinal direction of the steel plate 12. Further, the fixed roll 8 may have a steering function that allows the steel sheet to be centered so that the center part in the width direction of the steel sheet is aligned with the center part of the continuous processing line by making the inclination angle adjustable. Good.

  On the other hand, the drum roll around which the steel plate 12 is wound in the loop car 7 does not have a function of preventing the meandering of the steel plate by changing the inclination angle. The drum roll in the loop car 7 has only a function of winding the steel plate 12 that has been passed through, and does not have a function of preventing meandering of the steel plate or preventing tension on the steel plate.

  As shown in FIG. 1, although tension is applied to the steel plate 12 by the bridle rolls 6 a and 6 b on the entry side and the exit side of the looper facility 1, the looper facility 1 is provided with equipment for applying tension to the steel plate 12. Absent. Therefore, in the looper facility 1, the steel plate 12 is likely to fall short of tension, and thus the problem of meandering of the steel plate 12 is likely to occur. In order to prevent the meandering of the steel plate 12 in the looper facility 1, it is effective to reduce the storage amount of the steel plate 12 in the looper facility 1 by bringing the loop car 7 closer to the fixed roll 8 side. Productivity of the entire continuous processing line is reduced.

  Next, the loop car 7 will be described in detail with reference to FIG. FIG. 2A is an explanatory diagram relating to a loop car of a conventional example, and FIG. 2B is an explanatory diagram relating to a loop car 7 according to the present invention.

  First, a general configuration of the loop car will be described with reference to the upper side of FIG. The loop car is usually located on the drum roll 21 around which the steel plate 12 is wound, the carriage 22 on which the drum roll 21 is mounted and provided with a wheel 24 at the lower portion, and the exit side of the drum roll 21, and the steel plate 12 is conveyed in the conveying direction A support member 23 for guiding to the exit side is provided.

  In the loop car used in the horizontal looper facility, the steel plate 12 enters from below the drum roll 21 and is carried out from above the drum roll 21. The support member 23 rises upward from the carriage 22 and supports the lower surface of the steel plate 12 carried out from the drum roll 21.

  2A, when the steel plate 12 is wound around the drum roll 21, the steel plate 12 is passed through while slightly bending downward. An angle formed by the steel plate 12 with respect to the horizontal plane at this time is defined as an approach angle θ. When the tension of the steel plate 12 is high (for example, when passing through a narrow steel plate 12), the approach angle θ is small, that is, the steel plate 12 is wound around the drum roll 21 in a state closer to the horizontal. On the other hand, when the tension of the steel plate is low (for example, when the wide steel plate 12 is passed through), the approach angle θ is large, and the steel plate 12 is wound around the drum roll 21 while being largely bent. When the approach angle θ increases, the winding angle of the steel plate 12 on the drum roll 21 (the central angle of the arc formed by the steel plate 12 wound around the drum roll 21) decreases, and the drum roll 21 grips the steel plate 12. Since the force becomes small, the steel plate 12 becomes easy to meander. Thereby, the problem of the damage of the edge part of the steel plate 12 may generate | occur | produce.

  Next, the loop car 7 according to the present invention will be described with reference to FIG.

  The loop car 7 according to the present invention shown on the upper side of FIG. 2B is also provided with a drum roll 21, a carriage 22, and a support member 23, similarly to the conventional loop car of FIG. The loop car 7 according to the present invention further includes a support roll 25 on the entry side with respect to the drum roll 21.

  The support roll 25 is disposed on the entry side with respect to the drum roll 21 and supports the lower surface of the steel plate 12 that has been passed through. Thereby, the bending of the steel plate 12 on the entry side of the loop car 7 can be prevented.

  As shown in the lower side of FIG. 2B, even the steel plate 12 that is easily bent due to insufficient tension or the like at the front stage of the support roll 25 is supported by the support roll 25, so that it faces the drum roll 21. And approach at an acute angle with respect to the horizontal plane. In the case of the loop car 7 according to the present invention, the angle formed by the steel plate 12 positioned between the support roll 25 and the drum roll 21 with respect to the horizontal plane is defined as an approach angle θ. The approach angle θ is preferably as small as possible, but a preferable range is 15 ° or less. When θ is larger than 15 °, the bending of the steel plate 12 cannot be effectively suppressed, and the meandering of the steel plate 12 when it is wound around the drum roll 21 cannot be effectively prevented. The lower limit of the approach angle θ is not particularly limited, but is preferably 0 ° or more. When θ is smaller than 0 °, the uppermost part of the support roll 25 is positioned above the lowermost part of the drum roll 21, and a downward force acts on the support roll 25, resulting in an excessive load. There may be a problem in strength. If θ is smaller than 0 °, the steel plate 12 and the platform (not shown) of the carriage 22 come into contact with each other, and there may be a problem that the steel plate 12 is scratched.

  In the present invention, the support roll 25 is provided on the entrance side of the drum roll 21, and the winding angle of the steel sheet 12 on the drum roll 21 is increased by reducing the entry angle θ of the steel sheet 12, so Since the gripping force increases, the steel plate 12 becomes difficult to meander.

  The size of the support roll 25, the distance between the drum roll 21 and the support roll 25, and the like may be appropriately set according to the steel type of the steel plate 12, the plate passing speed, and the like so that the θ is an appropriate size. it can.

  A preferable example of the diameter of the support roll 25 is 165 mm or less. If the diameter of the support roll 25 becomes too large, in addition to the above-described problem that the approach angle θ becomes too small, the support roll 25 and a table roll that is provided in the looper equipment 1 and supports the lower surface of the steel plate 12 (see FIG. (Not shown) may come into contact, which may hinder the movement of the loop car 7 and cause a safety problem. On the other hand, if the diameter of the support roll 25 becomes too small, the support roll 25 cannot support the lower surface of the steel plate 12 with a sufficient force. For example, the diameter of the support roll may be 100 mm or more.

  The distance in the horizontal direction between the drum roll 21 and the support roll 25 may be, for example, 2500 mm or more and 3000 mm or less. If the distance in the horizontal direction is too large, the steel plate 12 is bent between the drum roll 21 and the support roll 25, and the meandering of the steel plate 12 cannot be sufficiently prevented. On the other hand, even if the distance in the horizontal direction is too small, the meandering of the steel plate 12 cannot be sufficiently prevented. The distance in the horizontal direction between the drum roll 21 and the support roll 25 is the horizontal direction of the straight line connecting the axis of the drum roll 21 and the axis of the support roll 25 shown on the upper side of FIG. Length.

  The distance in the height direction between the drum roll 21 and the support roll 25 can be appropriately designed according to the distance in the horizontal direction. The distance in the height direction is a difference in the height direction between the lowermost part of the drum roll 21 and the uppermost part of the support roll 25. As described above, the uppermost part of the support roll 25 is positioned below the lowermost part of the drum roll 21 in view of setting the approach angle θ of the steel sheet 12 to 0 ° or more, and not deteriorating the sheet passing property. It is preferable to do so.

  The support roll 25 includes a shaft portion and a roll portion (both not shown). The material of the shaft portion of the support roll 25 and the body portion (core portion) of the roll portion preferably has a strength capable of withstanding the pressure applied when the steel plate 12 is passed. Suitable examples of such materials include carbon steel, stainless steel, heat resistant steel and the like. Moreover, it is preferable that the surface of the roll part of the support roll 25 is covered with a material having acid resistance, heat resistance, friction resistance, and the like. As a suitable example, an example in which a rubber lining is applied to the surface of the support roll 25 can be given. By applying rubber lining to the support roll 25, the steel plate 12 can be guided to the drum roll 21 while being bitten with a sufficient frictional force without damaging the surface of the steel plate 12 during passing.

  In addition, the support roll 25 may be a split roll type that is divided into a plurality of rolls in the axial direction, or may be a single roll type that includes one roll in the axial direction. From the viewpoint of suppressing the installation cost and maintenance cost of the support roll 25, a single roll type is preferable.

  When the support roll 25 is a single roll type, the axial length of the support roll 25 supports the entire lower surface of the steel plate 12 even when the steel plate 12 having the largest plate width meanders among the steel plates 12 to be passed. It may be long enough to be able to. For example, when a steel plate having a plate width of 1900 mm is the steel plate having the largest plate width, the axial length of the support roll may be about 2000 to 2300 mm.

  The loop car and the looper equipment according to the present invention are preferably used when passing a steel plate (wide material) having a large plate width. In wide materials, problems due to meandering in the looper facility are likely to occur, and conventionally, passing plates are made while reducing (restricting) the storage amount. By applying the loop car and looper equipment of the present invention, it is possible to alleviate restrictions on the storage amount, improve the plate passing speed of the continuous processing line, and improve the processing efficiency. In addition, as a suitable example with a wide material, the steel plate which has a board width of 1650 mm or more and 1900 mm or less is mentioned.

  The loop car 7 according to the present invention is provided with a support roll mounting member such as a roll chock at the entry side end of the cart 22 of the conventional loop car shown in FIG. can get. As described above, in the present invention, since the conventional loop car can be used to prevent the meandering of the steel sheet, the initial cost can be suppressed.

  Further, in the loop car 7 of the present invention, the support roll 25 moves as the loop car 7 moves. Therefore, the bending of the steel plate 12 when it is wound around the drum roll 21 can be suppressed regardless of the storage amount of the steel plate 12 (the position of the loop car 7 in the looper facility 1).

  As shown in FIG. 1, in the looper facility 1 having a plurality of loop cars 7, both the loop car 7 according to the present invention (with the support roll 25) and the conventional loop car (without the support roll 25) are provided. It may be used, or only the loop car 7 according to the present invention may be used. In order to more reliably prevent the meandering of the steel sheet in the looper facility 1, it is preferable to apply the loop car 7 according to the present invention to all the plurality of loop cars.

  The equipment described in FIG. 1 was used to continuously pickle steel plate coils after hot rolling. The steel plates were divided into two types, those having a plate width of 760 or more and less than 1650 mm (narrow material), and those having a plate width of 1650 mm or more and 1900 mm or less (wide material), and each plate was passed by changing the angle of entry into the loop car. In the example of the present invention, a loop car with a support roll shown in FIG. 2B was used. When the narrow material was passed, the steel sheet entered an angle of 10 ° or less, and when the wide material was passed, the steel sheet entered an angle of 15 ° or less. Further, as a conventional example, when a similar experiment was performed using a looper facility provided with a loop car shown in FIG. 2A, the approach angle of the steel sheet was 10 ° or less when passing a narrow material. However, the approach angle of the steel sheet was 30 ° or less when the wide material was passed.

  When passing, the position of the loop car was adjusted as appropriate so that no meandering of the steel plate occurred in the looper facility. The storage amount (length in the longitudinal direction) of the steel plate in the looper equipment during the passage was examined, and the ratio (storage rate) to the upper limit value of the storage amount was obtained. In addition, the upper limit of the storage amount of the steel plate in the looper facility was 416 m.

  The results are shown in Table 1 below. In both the conventional example and the inventive example, the steel plate having a plate width of 760 mm or more and less than 1650 mm was able to store the steel plate up to the upper limit of the steel plate storage amount (416 m), and the storage rate was 100%. On the other hand, with regard to a wide steel plate having a plate width of 1650 mm or more and 1900 mm or less, the storage rate of the steel plate is limited to 50% in order to prevent meandering in the conventional example. On the other hand, in the present invention example, the meandering of the steel plate can be effectively prevented by the loop car provided with the support roll, and the steel plate can be stored up to a value (333 m) closer to the upper limit value of the steel plate storage amount. Was able to be improved to 80%. As a result, the production amount per unit time in the subsequent processing section (pickling processing section) was improved by about 2% compared to the conventional example.

DESCRIPTION OF SYMBOLS 1 Looper equipment 2 Steel plate coil 3 Leveler 4 Shear 5 Welder 6a, 6b, 6c Bridle roll 7, 7a, 7b Loop car 8, 8a, 8b Fixed roll 9 Uncoiler 10 Tension leveler 11 Wire 12 Steel plate 13 Drive device 21 Drum roll 22 Cart 23 Support member 24 Wheel 25 Support roll

Claims (7)

A loop car that is used in a looper facility that passes and stores steel sheets between rolls, and is movable along the longitudinal direction of the steel sheet,
A drum roll that wraps a steel plate and changes the conveying direction of the steel plate;
A loop car comprising: a support roll provided on an entry side of the drum roll and supporting a lower surface of the steel plate.   2. The loop car according to claim 1, wherein the support roll supports a lower surface of the steel plate so that an entrance angle of the steel plate to the drum roll is 15 ° or less.   The loop car according to claim 1 or 2, wherein the support roll is provided with a rubber lining. A looper facility for storing steel sheets between rolls,
A fixing roll provided at one end in the longitudinal direction, and a longitudinal position of the steel plate is fixed in the through plate,
A loop car provided at the other end in the longitudinal direction and movable along the longitudinal direction of the steel sheet;
The looper is a looper according to any one of claims 1 to 3, wherein the looper is a looper facility.   The looper facility according to claim 4, wherein the looper facility is a horizontal looper facility in which a steel plate is passed through in a horizontal direction.   A steel plate storage method, wherein the steel plate is passed through and stored in the looper facility according to claim 4 or 5.   The steel plate storage method according to claim 6, wherein a steel plate having a plate width of 1650 mm or more and 1900 mm or less is stored.

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