Method for detecting the amount of bending travel of a metal strip and method for controlling the bending travel

Abstract

The present invention relates to a method for detecting the amount of curved travel of a metal strip that travels while overlapping multiple layers at a spaced interval, the method including the steps of: using a plurality of distance meters arranged in a width direction of the metal strip on at least one side in the width direction of the metal strip overlapping multiple layers, measuring a distance from the installation position of the distance meter with respect to a direction intersecting the width direction of the metal strip, and detecting the layer of the metal strip that has curved traveled and the amount of curved travel using the installation position of the distance meter and the measured value.

Description

Technical Field

[0001] This invention relates to a method for detecting the bending travel of a metal strip and a method for controlling the bending travel. Background Technology

[0002] Typically, a processing line for metal strips such as steel sheets consists of an input section for feeding and welding the metal strip, a central section for annealing, rolling, and pickling the metal strip, and an output section for winding and cutting the metal strip. Each section also has multiple rollers for supporting and controlling tension during the strip pass-through process, on which the metal strip passes through a series of processes from the input to the output side. This series of processes is called the strip pass-through.

[0003] To maintain consistent strip quality by keeping the speed of the conveyor belt constant in the central section, a strip storage / feeding device called a looper is installed between the input, central, and output sections. The looper has a fixed roller and a looper carriage; the further the looper carriage is from the fixed roller, the more strip is stored. Typically, to increase the strip storage capacity, the looper consists of multiple layers of strip overlapped at intervals in the longitudinal or transverse direction.

[0004] However, due to roller wear or the shape of the strip, the metal strip may sometimes shift from the center of the roller in the width direction towards the end of the strip within the conveyor belt. This phenomenon is called flexural travel. If the amount of flexural travel of the metal strip becomes large, it may lead to equipment damage due to contact between the metal strip and surrounding equipment, or breakage of the metal strip due to rapid tension changes, raising concerns about significant production losses. In light of this background, a technique for controlling the amount of flexural travel of the metal strip has been proposed.

[0005] Specifically, a known bending travel control device is the CPC (Center Position Control) device, which includes a bending travel detector and a bending travel correction mechanism (hereinafter referred to as a guide roller). Examples of bending travel detectors include a light-emitting diode pair and an AWC (Automatic Width Control) device, while examples of the bending travel correction mechanism include a roller tilting mechanism. The bending travel detector detects the width direction position of the metal strip. The CPC device then calculates the deviation between the detected value of the bending travel detector and the target position, and controls the bending travel correction mechanism to reduce this deviation.

[0006] Furthermore, Patent Document 1 describes a method for improving bending correction capability by reducing the tension of the steel plate within the looper, thereby detecting the bending movement of the steel plate using a light projector and correcting it by tilting a steering roller. Patent Document 2 describes an apparatus and method for calculating the bending movement of the steel plate by installing a dividing roller in the width direction of the steel plate and detecting the reaction force from the steel plate acting on both ends of the dividing roller. Patent Document 3 describes a method for detecting the position of the sheet end using multiple light projectors and receivers.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2014-231432

[0010] Patent Document 2: Japanese Patent Application Publication No. 2006-346715

[0011] Patent Document 3: Japanese Patent Application Publication No. 2013-40038 Summary of the Invention

[0012] The problem that the invention aims to solve

[0013] However, within the looper, the looper carriage moves, and equipment such as light projectors and AWC (Autoclave Controller) cannot be installed along its path. Therefore, it is difficult to use a CPC (Current Control Point) device to control the bending movement of the metal strip within the looper. On the other hand, the method described in Patent Document 1, due to the use of a light projector, has the limitation of only detecting the bending movement of the metal strip on the fixed roller side. Furthermore, the method described in Patent Document 2 requires multiple devices such as a dividing roller, support shaft, and pressure detector, increasing installation space and cost. Additionally, the method described in Patent Document 3, in locations where there are multiple layers of metal strip within the looper, makes it impossible to detect which metal strip is bending and to determine which steering roller should be tilted.

[0014] The present invention was made in view of the above-mentioned problems, and its object is to provide a method for detecting the bending travel of a metal strip, which can detect the bending travel of the metal strip in the looper in a space-saving and cost-effective manner in any layer. Another object of the present invention is to provide a method for controlling the bending travel of a metal strip, which can detect the bending travel of the metal strip in the looper in a space-saving and cost-effective manner in any layer, thereby correcting the bending travel of the metal strip.

[0015] Solution for solving the problem

[0016] The present invention provides a method for detecting the bending travel of a metal strip. The method detects the bending travel of a metal strip that is multiple layers overlapping at intervals. The method includes the following steps: using a plurality of rangefinders arranged along the width direction of the metal strip on at least one side of the overlapping metal strip, measuring the distance from the mounting position of the rangefinders relative to a direction intersecting the width direction of the metal strip, and using the mounting position of the rangefinders and the measured value to detect the layers of the metal strip that cause bending travel and the bending travel amount.

[0017] The bending travel control method for metal strip of the present invention includes the following steps: controlling the bending travel of metal strip based on the bending travel amount of metal strip detected by the bending travel amount detection method of the present invention.

[0018] It may include the following steps: if, after correcting the bending of the metal strip in the detected bending layer, bending of the metal strip in other layers is detected, the bending of the metal strip in other layers is corrected.

[0019] Invention Effects

[0020] The metal strip bending travel detection method of the present invention can detect the bending travel of the metal strip in the looper in any layer in a space-saving and cost-effective manner. Furthermore, the metal strip bending travel control method of the present invention can detect the bending travel of the metal strip in the looper in any layer in a space-saving and cost-effective manner, thereby correcting the bending travel of the metal strip. Attached Figure Description

[0021] Figure 1 This is a side view showing the structure of the looper device of the metal strip bending travel control device according to an embodiment of the present invention.

[0022] Figure 2 This is a block diagram illustrating the structure of a metal strip bending and traveling control device according to an embodiment of the present invention.

[0023] Figure 3 It is used to explain by Figure 2 The graph shows the parameters detected by the rangefinder.

[0024] Figure 4 This is a diagram illustrating a method for controlling the bending and traveling of a metal strip according to an embodiment of the present invention.

[0025] Figure 5 This is a diagram illustrating a method for controlling the bending and traveling of a metal strip according to an embodiment of the present invention.

[0026] Figure 6This is a diagram illustrating a method for controlling the bending and traveling of a metal strip according to an embodiment of the present invention.

[0027] Figure 7 This is a diagram illustrating a method for controlling the bending and traveling of a metal strip according to an embodiment of the present invention.

[0028] Figure 8 This is a diagram illustrating a method for controlling the bending and traveling of a metal strip according to an embodiment of the present invention.

[0029] Figure 9 This is a diagram illustrating a method for controlling the bending and traveling of a metal strip according to an embodiment of the present invention.

[0030] Figure 10 This is a diagram illustrating a method for controlling the bending and traveling of a metal strip according to an embodiment of the present invention. Detailed Implementation

[0031] Hereinafter, the structure of a metal strip bending and traveling control device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0032] [Structure of the Looping Device]

[0033] First, refer to Figure 1 The structure of the looper device of the bending travel control device for metal strip according to an embodiment of the present invention will be described.

[0034] Figure 1 This is a side view showing the structure of the looper device of the metal strip bending travel control device according to an embodiment of the present invention. Figure 1 As shown, in the looper device 1 of the metal strip bending travel control device according to an embodiment of the present invention, the metal strip 2 passes back and forth between the guide roller 3 and the looper 4. Therefore, multiple layers of metal strips 2 (2a, 2b, 2c, 2d) are spaced apart within the looper device 1. In this embodiment, the metal strip bending travel control device detects the bending travel amount of the metal strip 2 within the looper device 1 in each layer in a space-saving and cost-effective manner to correct the bending travel of the metal strip 2.

[0035] [Structure of the bending and travel control device for the metal strip]

[0036] Next, refer to Figure 2 as well as Figure 3 The structure of a bending travel control device for a metal strip according to an embodiment of the present invention will be described.

[0037] Figure 2 This is a block diagram illustrating the structure of a metal strip bending and traveling control device according to an embodiment of the present invention. Figure 2As shown, the bending travel control device 10 of the metal strip according to one embodiment of the present invention includes n (n≥2) rangefinders 11, bending travel detectors 12 and control devices 13.

[0038] like Figure 3 As shown, the rangefinder 11 is composed of one-dimensional rangefinders arranged along the width direction of the metal strip 2 on at least one side of the overlapping multi-layered metal strip 2. The rangefinder 11 detects the values ​​of parameters h and l, and outputs an electrical signal representing the detected value to the bending travel detector 12. Here, parameter h represents the height F of the rangefinder 11 (11_j (j = 1 to n)) above the ground, and parameter l represents the measured value of the rangefinder 11 (11_j (j = 1 to n)). It should be noted that in the figure, C j (j=1~n) indicates the installation position of the rangefinder 11 in the width direction. The installation position of the rangefinder 11 varies depending on the amount of bending travel of the metal strip 2 that the user can tolerate. In addition, the precision of the control can be determined by the number of rangefinders 11. Furthermore, by setting the rangefinder 11 on both the load side and the opposite side of the load in the width direction of the metal strip 2, the bending travel of the metal strip 2 in either direction can be detected.

[0039] The bending travel detector 12 detects the bending travel amount s of the i-th layer (Ii = 1 to 4 in this example) of the metal strip 2 based on the electrical signal output from the rangefinder 11. i , will represent the detected bending travel amount s i The electrical signal is output to the control device 13.

[0040] Control device 13 controls the bending travel amount s of the metal strip 2 of the i-th layer detected by bending travel detector 12. i Within the specified range. Specifically, the control device 13 corrects the bending travel of the metal strip 2 of the i-th layer by tilting the steering roller that is directly connected to the metal strip 2 of the i-th layer.

[0041] The following is for reference Figures 4 to 10 The bending travel amount detection method and bending travel control method of the metal strip 2 by the bending travel detector 12 and the control device 13 are described in detail.

[0042] First, such as Figure 4As shown, consider the case where only the metal strip 2c bends and travels. In this case, the measured values ​​l of rangefinders 11_1 and 11_2 are h3, and the measured value l of rangefinder 11_3 is h. Therefore, the bending travel detector 12 determines that no bending travel occurs in the metal strip 2d, but a bending travel amount c2 occurs in the metal strip 2c, corresponding to the width direction mounting position of the rangefinder 11_2. Therefore, the control device 13 corrects the bending travel of the metal strip 2c by tilting the guide roller directly connected to the metal strip 2c, thereby correcting the bending travel amount c2 of the metal strip 2c. As a result, as... Figure 5 As shown, the measured values ​​l of all rangefinders 11 become h, and the metal strips 2a to 2d were found to have not bent or moved.

[0043] Next, as Figure 6 As shown, imagine a scenario where multiple metal strips (e.g., metal strip 2c and metal strip 2d) are traveling in a curved path, and their respective curved paths can be detected. In this case, the measured value l of rangefinder 11_1 is h4, the measured value l of rangefinder 11_2 is h3, and the measured value l of rangefinder 11_3 is h. Therefore, the curved path detector 12 determines that a curved path amount c1 has occurred in metal strip 2d, corresponding to the width direction mounting position of rangefinder 11_1, and a curved path amount c2 has occurred in metal strip 2c, corresponding to the width direction mounting position of rangefinder 11_2. Therefore, the control device 13 tilts the guide roller directly connected to metal strip 2d to correct the curved path of metal strip 2d, and tilts the guide roller directly connected to metal strip 2c to correct the curved path of metal strip 2c, thereby correcting the respective curved path amounts of metal strip 2d and metal strip 2c. The result is as follows: Figure 7 As shown, the measured values ​​l of all rangefinders became h, and the metal strips 2a to 2d were found to have not bent or moved.

[0044] Finally, as Figure 8 As shown, imagine a situation where multiple metal strips (e.g., metal strip 2b and metal strip 2d) are traveling in a curved path, but only a portion of the curved path is detected. In this case, the measured values ​​l of rangefinders 11_1 and 11_2 are h4, and the measured value l of rangefinder 11_3 is h. Therefore, the curved path detector 12 determines that a curved path amount c2 has occurred in metal strip 2d, corresponding to the width direction mounting position of rangefinder 11_2. Therefore, the control device 13 tilts the guide roller directly connected to metal strip 2d to correct the curved path of metal strip 2d, thereby correcting the amount of curved path of metal strip 2d. The result is as follows: Figure 9As shown, the measured value l of rangefinder 11_1 becomes h2, and the measured values ​​l of rangefinders 11_2 and 11_3 become h. Therefore, the bending travel detector 12 determines that no bending travel occurred in metal strips 2c and 2d, but a bending travel amount c1 corresponding to the installation position of rangefinder 11_1 occurred in metal strip 2b. Therefore, the control device 13 tilts the steering roller directly connected to metal strip 2b to correct the bending travel of metal strip 2d, thereby correcting the bending travel amount of metal strip 2b. The result is as follows: Figure 10 As shown, the measured values ​​l of all rangefinders became h, and the metal strips 2a to 2d were found to have not bent or moved.

[0045] The embodiments of the invention made by the inventors have been described above, but the present invention is not limited to the descriptions and drawings disclosed in this embodiment, which constitute a part of the present invention. For example, the present invention is characterized by its use in places where multiple layers of metal strips overlap, and therefore, it can also be applied to places other than loopers (e.g., near the confluence of metal strips in cases where multiple metal strip feeding devices are provided). Thus, all other embodiments, examples, and techniques applied based on this embodiment by those skilled in the art are included within the scope of the present invention.

[0046] Industrial applicability

[0047] According to the present invention, a method for detecting the bending travel of a metal strip can be provided, which can detect the bending travel of the metal strip in the looper in a space-saving and cost-effective manner in any layer. Furthermore, according to the present invention, a method for controlling the bending travel of a metal strip can be provided, which can detect the bending travel of the metal strip in the looper in a space-saving and cost-effective manner in any layer, thereby correcting the bending travel of the metal strip.

[0048] Explanation of reference numerals in the attached figures

[0049] 1 Looping device

[0050] 2, 2a, 2b, 2c, 2d metal strips

[0051] 3 steering rollers

[0052] 4-horse harness

[0053] 10. Bending and traveling control device for metal strips

[0054] 11, 11_1, 11_2, 11_3, 11_n rangefinder

[0055] 12-bend travel detector

[0056] 13 Control devices

Claims

1. A method for controlling the bending and movement of a metal strip, wherein, Includes the following steps: The step of detecting the bending travel of a metal strip that travels in multiple overlapping layers at intervals involves using a plurality of one-dimensional rangefinders arranged along the width direction of the metal strip on at least one side of the overlapping metal strip, measuring the distance from the mounting position of the one-dimensional rangefinders relative to a direction intersecting the width direction of the metal strip, and using the mounting position of the one-dimensional rangefinders and the measured value to detect the layers of the metal strip that cause the bending travel and the bending travel amount. The bending movement of the metal strip is controlled based on the detected bending travel amount.

2. The bending travel control method for a metal strip as described in claim 1, wherein, The process includes the following steps: after correcting the bending of the metal strip in the detected bending layer, if bending of the metal strip in other layers is detected, the bending of the metal strip in other layers is corrected.

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