JP2663837B2 - Steel strip meandering control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meandering control device for a steel strip in a tension section of a continuous conveying line of steel sheets or a pickling line of a steel strip.

[0002]

2. Description of the Related Art In a steel strip processing line, for example, a continuous feeding line of thin steel sheets or a steel strip pickling line, when a meandering of a steel strip (hereinafter referred to as a strip) occurs in the line, the strip is installed in the line. Meandering control is performed by the steering roll. The meandering control by the steering roll is generally performed by tilting the roll. There are basically two types of roll tilt. As shown in FIG. 8A, a line center LC and a strip center SC are used.
When the meandering D occurs in FIG. 8, as shown in FIG.
The roll 71 is tilted in the vertical direction with respect to the line center LC by the angle θ, or as shown in FIG.
Is tilted by the angle θ. In the meandering control by the steering roll, a difference in tension is generated on both sides of the strip by tilting the roll. The difference in tension has the disadvantage of causing poor flatness of the strip.

Conventionally, as a meandering control device for a strip, for example, as a centering method before a side trimmer in a strip pickling line, side guides are opened and closed symmetrically with respect to a center. A method of controlling the distance between the left and right side guides according to a change in the width of the steel sheet by using a pair of photo heads that detect both side edges of the steel sheet passing through the side guide in conjunction (Japanese Patent Laid-Open No. 54-6275). In a washing line, a method of performing tension trimming by introducing a steel strip after pickling treatment to a trimmer under the action of a backup tension, wherein the steel strip meandering straightening device installed in front of the trimmer entrance side is used to remove the steel strip. While correcting the meandering, the steel strip is guided by the steel strip side guide device provided at the entrance of the trimmer, and the (Japanese Unexamined Patent Publication No. 61-226213), a method of controlling the position of the trimmer so that the center of the trimmer coincides with the center of the steel strip introduced into the steel strip. Apparatus that supports a rotatable roll about the pass line axis and that rotates the downstream roll about the pass line axis between the two rolls (Japanese Patent Application Laid-Open No. 2-38252).
And the like have been proposed.

[0004]

Problems to be Solved by the Invention
The method disclosed in Japanese Patent Publication No. 75 is premised on that the running position of the strip is substantially near the center of the line center, and is therefore difficult to realize when the meandering is large. Further, the method disclosed in Japanese Patent Application Laid-Open No. 61-226213 discloses a method in which the meandering of a strip is corrected by a strip meandering correction device in front of a trimmer entry side, the centering is performed by a side guide device, and the center of a steel strip introduced into the trimmer is further improved. The trimmer position is controlled so that the center of the trimmer coincides with that of the trimmer.If forcible centering is performed by the side guide device, not only the edge of the steel strip will break, but it is necessary to install a trimmer position control device. Requires significant remodeling. The apparatus disclosed in Japanese Patent Application Laid-Open No. 2-38252 eliminates the tension difference generated on both sides of the strip by separately controlling the turning angles of the two steering rolls. However, since it performs meandering control for strip continuous surface treatment and the like, it cannot be applied to equipment that requires high precision such as centering of a side trimmer.

An object of the present invention is to provide a meandering control device capable of preventing meandering without deteriorating the flat shape of the strip.

[0006]

Means for Solving the Problems The present inventors have intensively studied and studied to achieve the above object. As a result, the tilting roll frame holding the entry-side fixed roll and the two rolls is arranged on the roll unit tilting frame that tilts around the center point of the entry-side fixed roll, and the tilting roll frame is tilted by the roll unit. If the frame is tiltably held in the vertical and horizontal directions, and the roll unit tilting frame is tilted in accordance with the meandering direction and the meandering amount detected by the meandering amount detector to perform meandering correction,
Due to the tension difference between the two sides of the strip caused by the tilting of the roll unit tilting frame, the tilting roll frame tilts so that the tension on both sides of the strip maintains the balance, and the direction of the strip on the roll exit side does not meander without deteriorating the flatness, We have determined that we can correct it and arrived at this invention.

That is, the present invention relates to a meandering control device for controlling the meandering of a steel strip by a steering roll. In the meandering control device, a tilting roll frame holding two rolls and an inlet fixed roll are supported by the center point of the inlet fixed roll. The tilting roll frame is disposed on the tilting roll unit tilting frame, and the tilting roll frame is held on the roll unit tilting frame so as to be tiltable in the vertical direction and the horizontal direction, and according to the meandering direction and the meandering amount detected by the meandering amount detector. A meandering control device for a steel strip, comprising a tilt control unit that controls a drive mechanism that tilts a roll unit tilt frame.

[0008]

In the method of the present invention, a tilting roll frame for holding an incoming fixed roll and two rolls is arranged on a roll unit tilting frame that tilts around a center point of the incoming fixed roll as a fulcrum. Tilt for holding the frame on the roll unit tilting frame so that it can tilt in the vertical and horizontal directions, and controlling a drive mechanism that tilts the roll unit tilting frame according to the meandering direction and the meandering amount detected by the meandering amount detector. Since the control unit is provided, the meandering of the strip is corrected by tilting the roll unit tilting frame according to the meandering direction and the meandering amount detected by the meandering amount detector, and the tilting roll frame is provided at both ends of the strip. Vertical and / or horizontal tension baluns at both ends of the strip depending on the tension difference Naturally tilted to take the tension balance of the strip ends is maintained. As a result, it is possible to prevent the strip from being flattened due to the meandering correction.

For example, as shown in FIG. 3, the roll unit tilting frame is slid to move the fixed roll 51 on the entrance side.
And the tilting roll 52 composed of two rolls is tilted by an angle θ to correct the deviation S ₁ of the meandering detector position L ₁ away from the center of the fixed roll 51 with the center point of the fixed roll 51 on the input side as a fulcrum. When the problem becomes deviation S ₂ arises from the stationary roll 51 centered with respect to the correction of the deviation S ₁ by L ₂ away point a. That is, the roll must be held so as to maintain the strip dispensing state in which the strip deviation after tilting by the angle θ is S ₁ = S ₂ . Since the tilting roll frame that holds the tilting roll 52 is held by the roll unit tilting frame so as to be tiltable in the vertical direction and the horizontal direction, the vertical and horizontal directions are caused by the tension difference between both sides of the strip caused by the tilting of the angle θ. naturally tilted in, as shown in FIG. 4, is corrected to the deviation S ₁ is smaller than the deviation S ₃ with tilting roll 52 around the tilting roll 52
At point A, which is L ₃ away from, the path center and the strip center coincide. The difference in tension on both sides of the strip due to the roll tilt is higher on the correction side and lower on the opposite side as compared to the correction side. The magnitude is a difference of 2σ. σ = E × (1 / cos θ−1) E: tension Due to the difference in tension, the tilting roll 52 naturally comes into a state shown in FIG. Next, the tilting of the tilting roll 52 by the angle θ causes a tension loosening side and a tensioning side between the fixed roll 51 and the tilting roll 52, and as shown in FIG.
In No. 2, the high tension side rotates upward, and the loose side rotates naturally until the tension balances downward. As a result, the tensions at both ends of the strip are balanced, and centering control without any problem becomes possible. In this case, it is important that the distance L between the center of the fixed roll 51 and the center of the lower tilting roll 52 be sufficiently large so that the distortion rate of the strip due to tilting is 0.1% or less.

[0010]

【Example】

Embodiment 1 The details of the present invention will be described below with reference to FIGS. 1 and 2 showing an embodiment. FIG. 1 is an overall plan view of the meandering control device of the present invention, and FIG. 2 is a view taken along line AA of FIG. 1 and 2, reference numeral 1 denotes a roll unit tilting frame;
Reference numeral 2 denotes a fixed roll on the entry side fixed to one upper side of the roll unit tilting frame 1, and 3 denotes No. No. 1 steering roll 4 and No. 1 2 A tilting roll frame for holding the steering roll 5, and a horizontal tilt 6 held by a tilting shaft 8 on a frame 7 protruding from the lower part of the roll unit tilting frame 1 on the opposite side of the fixed roll 2 so as to be tiltable in the horizontal direction. The tilting roll frame 3 is held by the turning frame so as to be tiltable in the vertical direction on a tilting shaft 9 projecting horizontally from the horizontal tilting frame 6, and the tilting roll frame 3 tilts in the horizontal and vertical directions. Have been.

The roll unit tilting frame 1 is pivotally supported on a fulcrum pin 11 which is the same as the center axis of the fixed roll 2 fixed on the base frame 10 so as to be tiltable around the exit-side pass line. . The roll unit tilting frame 1 is provided with slide liners 12 at four lower surfaces, and the slide liners 12 at four lower surfaces are located on a slide liner 13 fixed to the base frame 10,
When the hydraulic cylinder 14 is operated, the hydraulic cylinder 14 is tilted around the output pass line with the fulcrum pin 11 as a fulcrum.

Reference numeral 15 denotes a sensor frame protruding from the base frame 10, and 16 denotes a light source 17 and the photosensor 1.
A meandering detector 20 for the strip 19 composed of 8 and a meandering control unit 20 for controlling the hydraulic cylinder 14 via the hydraulic control unit 21 according to the meandering direction and the meandering amount of the strip 19 with respect to the path center input from the meandering detector 16. By operating, the roll unit tilting frame 1 is tilted at a predetermined angle with the fulcrum pin 11 as a fulcrum, and the meandering of the strip 19 is corrected.

With the above configuration, the meandering control unit 20 controls the hydraulic cylinder 14 via the hydraulic control unit 21 in accordance with the meandering direction and the meandering amount of the strip 19 with respect to the path center input from the meandering detector 16. Operate the roll unit tilting frame 1 to support the fulcrum pin 11
Is tilted by a predetermined angle with the fulcrum as a fulcrum, and a difference in tension is generated on both sides in the width direction of the strip 19 to correct the meandering of the strip 19. The difference in tension generated on both sides in the width direction of the strip 19 due to the tilting of the roll unit tilting frame 1 is as follows.
Since the tilting roll frame 3 is provided so as to be tiltable in the horizontal direction and the vertical direction, the tilting roll frame 3, that is, No. 1 is naturally released so as to eliminate the tension difference on both sides of the strip 19 corresponding to the tension difference on both sides of the strip 19. No. 1 steering roll 4 and No. 1 Since the two steering rolls 5 are tilted in the horizontal and vertical directions, the difference in tension generated on both sides in the width direction of the strip 19 due to the tilting of the roll unit tilting frame 1 is balanced, and the meandering of the strip 19 is corrected.

Second Embodiment As shown in FIG. 7, the steering roll unit 31 of the first embodiment is installed between a steering roll 33 and a side guide 34 of a side trimming device of a strip 32 of a soft material pickled. In the case of the method and the case of the conventional method not using the steering roll unit 31, side trimming of the steel strip of the pickled soft material having a thickness of 2.0 to 6.0 mm and a width of 1200 mm was performed.
The percentage of trim removal and the percentage of flat defects in each of 100 or more test materials were measured. Table 1 shows the results. The trim detachment ratio was determined as a percentage when one of the side trimmers in the test material was detached from the steel strip edge portion, as the trim detachment. In addition, the flat defect rate was determined from the percentage of the entire test material having flat portions.

[0015]

[Table 1]

As shown in Table 1, according to the method of the present invention, the trim detachment ratio could be reduced to 1/10 or less without deteriorating the flat shape as compared with the conventional method.

[0017]

As described above, according to the present invention,
The meandering control can be performed with high precision without affecting the existing steering roll and without causing the strip to be flat.

[Brief description of the drawings]

FIG. 1 is an overall plan view of a meandering control device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view of a state in which the steering roll unit is tilted with the entire steering roll unit fixed.

FIG. 4 is an explanatory view when a difference in tension of a strip due to tilting of a steering roll unit is corrected by a tilting roll unit.

FIG. 5 is a diagram illustrating a state in which a difference in tension of a strip due to tilting of a steering roll unit is corrected by a tilting roll.

FIG. 6 is a diagram illustrating a state in which a difference in tension between a fixed roll and a tilting roll of a steering roll unit is corrected by a tilting roll.

FIG. 7 is an overall side view of a side trimming device provided with a steering roll unit of the present invention used in Embodiment 2.

FIGS. 8A and 8B are explanatory diagrams of meandering control by tilting the steering roll in the vertical direction. FIG. 8A is a diagram illustrating a state before the meandering correction, and FIG.

9A and 9B are explanatory diagrams of meandering control by tilting the steering roll in the horizontal direction. FIG. 9A is a diagram illustrating a state before the meandering correction, and FIG. 9B is a diagram illustrating a state after the meandering correction.

[Explanation of symbols]

 1 Roll unit tilt frame 2, 51 Fixed roll 3 Tilt roll frame 4 No. 1 steering roll 5 No. 2 Steering roll 6 Horizontal tilt frame 7 Frame 8, 9 Tilt axis 10 Base frame 11 Support pin 12, 13 Slide liner 14 Hydraulic cylinder 15 Sensor frame 16 Meander detector 17 Light source 18 Photosensor 19, 32 Strip 20 Meander controller 21 hydraulic control unit 31 steering roll unit 33 steering roll 34 side guide 52 tilting roll unit 71 roll LC line center SC strip center

Claims (1)

(57) [Claims] 1. A meandering control device for controlling meandering of a steel strip by a steering roll.
The tilting roll frame that holds the rolls is arranged on the roll unit tilting frame that tilts around the center point of the fixed roll on the entry side, and the tilting roll frame can be tilted vertically and horizontally on the roll unit tilting frame. A meandering control device for controlling a drive mechanism for tilting a roll unit tilting frame according to a meandering direction and a meandering amount detected by a meandering amount detector. .