Method for detecting a run-out of a metal strip and method for controlling a run-out

Abstract

The present application relates to a method for detecting a deviation of a metal strip, which is a method for detecting a deviation of a metal strip that travels in a plurality of layers with a space therebetween, including: a first step of calculating a width-direction end portion position of each layer of the metal strip using an angle formed by a reference direction arbitrarily decided from a reference point and a direction connecting the reference point and the width-direction end portion position of each layer of the metal strip, a distance between the reference point and the width-direction end portion position of each layer of the metal strip, and a distance between a straight line including the width direction of the metal strip and the reference point; and a second step of calculating a deviation of each layer of the metal strip based on the width-direction end portion position calculated in the first step.

Description

Technical Field

[0001] This invention relates to a method for detecting and controlling the deviation of metal strips. Background Technology

[0002] Generally, a processing line for metal strips such as steel plates consists of the following sections: an inlet section for transferring and welding the metal strip; a central section for annealing, rolling, and pickling the metal strip; and an outlet section for coiling and shearing the metal strip. Each section is equipped with multiple rollers for supporting the strip and controlling tension, through which the metal strip passes through a series of processes from the inlet to the outlet. This series of processes is called strip feeding.

[0003] To maintain a constant strip speed and thus consistent strip quality in the central section, storage / transfer devices called loopers are installed between the inlet, central, and outlet sections. Each looper has a fixed roller and a looper car; the further the looper car is from the fixed roller, the more strip it stores. Typically, to increase strip storage capacity, loopers are designed to have multiple layers of strip overlapped longitudinally or laterally with gaps.

[0004] However, due to roller wear, strip shape, and other factors, metal strip sometimes shifts from the center of the rollers in the width direction towards its ends during the conveyor belt movement. This phenomenon is called strip misalignment. If the strip misalignment becomes significant, it could lead to equipment damage due to contact with surrounding equipment, or strip breakage due to rapid tension changes, potentially resulting in substantial production losses. Based on this background, techniques for controlling strip misalignment have been proposed.

[0005] Specifically, as a general belt misalignment control device, a CPC (Center Position Control) device is known. The CPC device includes a belt misalignment detection mechanism and a belt misalignment correction mechanism (hereinafter referred to as a steering roller). Here, the belt misalignment detector can be a light-emitting receiver assembly, an AWC (Automatic Width Control) mechanism, etc., and the belt misalignment correction mechanism can be a roller tilting mechanism, etc. The belt misalignment detector detects the position of the metal strip in the width direction. Then, the CPC device calculates the deviation between the detection value of the belt misalignment detector and the target position, and controls the belt misalignment correction mechanism to reduce the deviation.

[0006] Furthermore, Patent Document 1 describes a method that uses a projector to detect the deviation of the steel plate, thereby improving the deviation correction capability by reducing the tension of the steel plate within the looper and enabling the correction of the deviation through the tilting of the steering roller. Additionally, Patent Document 2 describes an apparatus and method that installs a dividing roller in the width direction of the steel plate, detects the reaction force from the steel plate acting on both ends of the dividing roller, and calculates the deviation amount of the steel plate.

[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 Summary of the Invention

[0011] The technical problem that the invention aims to solve

[0012] However, in a looper, the looper carriage moves, making it impossible to install devices such as light projectors or AWC (Automatic Shaft Control) devices in the carriage's travel path. Therefore, it is difficult to use a CPC (Cost Per Control) device within the looper to control strip misalignment. On the other hand, the method described in Patent Document 1, due to the use of a light projector, suffers from the limitation of only detecting strip misalignment 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, resulting in significant space requirements and costs.

[0013] This invention addresses the aforementioned technical problems and aims to provide a method for detecting the deviation of metal strip, which can detect the deviation of metal strip within a loop in any layer with space and cost savings. Furthermore, another objective of this invention is to provide a method for controlling the deviation of metal strip, which can detect the deviation of metal strip within a loop in any layer with space and cost savings, thereby correcting the deviation of the metal strip.

[0014] Technical solutions for solving technical problems

[0015] The method for detecting the deviation of metal strips involved in this invention is a method for detecting the deviation of metal strips traveling in multiple overlapping layers with gaps. The method includes: a first step, calculating the width-direction end position of each layer of metal strip using the angle between a direction arbitrarily determined from a reference point (i.e., the reference direction) and the direction connecting the reference point and the width-direction end position of each layer of metal strip, the distance between the reference point and the width-direction end position of each layer of metal strip, and the distance between a straight line including the width direction of the metal strip and the reference point; and a second step, calculating the deviation of each layer of metal strip based on the width-direction end position calculated in the first step.

[0016] The first step may include the following steps: making the rangefinder scan around the reference point, and according to the relationship between the scanning angle and the detection value of the rangefinder, setting the scanning angle where the detection value changes drastically as the angle between the reference direction and the direction connecting the reference point and the width direction end position of the metal strip of each layer.

[0017] The method for controlling the deviation of metal strip involved in this invention includes the following steps: controlling the deviation of metal strip based on the deviation amount detected by the metal strip deviation detection method involved in this invention.

[0018] Beneficial effects

[0019] The metal strip misalignment detection method of this invention can detect the misalignment of the metal strip within the looper in any layer with space-saving and cost-effectiveness. Furthermore, the metal strip misalignment control method of this invention can detect the misalignment of the metal strip within the looper in any layer with space-saving and cost-effectiveness, thereby correcting the misalignment of the metal strip. Attached Figure Description

[0020] Figure 1 This is a side view showing the configuration of the looper used in the metal strip misalignment control device according to one embodiment of the present invention.

[0021] Figure 2 This is a block diagram illustrating the configuration of a metal strip misalignment control device as one embodiment of the present invention.

[0022] Figure 3 It is used for Figure 2 The diagram illustrates the parameters detected by the rangefinder.

[0023] Figure 4 This is a graph showing the relationship between the scanning angle of the rangefinder and the detected value. Detailed Implementation

[0024] Hereinafter, the configuration of a metal strip misalignment control device according to one embodiment of the present invention will be described with reference to the accompanying drawings.

[0025] [The structure of a loop]

[0026] First, refer to Figure 1 The configuration of the looper applicable to the metal strip misalignment control device, which is one embodiment of the present invention, will be described.

[0027] Figure 1 This is a side view showing the configuration of the looper used in a metal strip misalignment control device according to one embodiment of the present invention. Figure 1 As shown, within the looper 1 to which the metal strip misalignment control device of one embodiment of the present invention is applied, the metal strip 2 moves back and forth between the guide roller 3 and the looper carriage 4. Therefore, multiple layers of metal strip 2 (2a, 2b, 2c, 2d) exist within the looper 1 with gaps. In this embodiment, the metal strip misalignment control device can detect the amount of misalignment of the metal strip 2 within the looper 1 in any layer, saving space and cost, and thus correct the misalignment of the metal strip 2.

[0028] [Composition of the metal strip misalignment control device]

[0029] Next, refer to Figure 2 and Figure 3 The configuration of a metal strip misalignment control device, which is one embodiment of the present invention, will be described.

[0030] Figure 2 This is a block diagram illustrating the configuration of a metal strip misalignment control device as one embodiment of the present invention. Figure 2 As shown, the metal strip misalignment control device 10, as an embodiment of the present invention, includes a rangefinder 11, a misalignment detector 12, and a control device 13.

[0031] like Figure 3 As shown, the rangefinder 11 consists of a two-dimensional scanner (two-dimensional distance sensor) mounted on one side above the uppermost metal strip 2 and at one end of the metal strip 2 in the width direction. The rangefinder 11 detects parameters θ and θ' by scanning within a specified angle range. i l θ The value is calculated, and an electrical signal representing the detected value is output to the deviation detector 12. Here, the position of the rangefinder 11 is set as the reference point, and the vertical direction below the rangefinder 11 is set as the reference direction. Furthermore, parameter θ represents the angle (>0) from the scanning start direction (reference direction) of the rangefinder 11. iThe parameter h represents the angle (the angle between the reference direction and the direction connecting the reference point and the width direction end position of the metal strip 2 of the i-th layer (i = 1 to 4 in this example) when the end face (points A to D) of the metal strip 2 is detected. The parameter h represents the height F of the distance measuring instrument 11 from the ground. i The parameter l represents the height F of the metal strip 2 in the i-th layer above the ground. θ This represents the measured value of the rangefinder 11 at angle θ (the distance between the reference point and the end position of the metal strip in the width direction of each layer). It should be noted that, according to the above, h-h i The distance between a straight line including the width direction of the metal strip and a reference point (the length of the perpendicular line from the reference point to the straight line).

[0032] It should be noted that the rangefinder 11 can also be constructed using a 3D scanner or a combination of multiple 1D rangefinders. Furthermore, the rangefinder 11 does not necessarily need to be positioned above the uppermost metal strip 2. Moreover, the rangefinder 11 can be positioned not only on one side of the width direction of the metal strip 2 but also on the other end, thereby improving detection accuracy and providing backup functionality in case of failure.

[0033] The deviation detector 12 detects the deviation amount s of the i-th layer of metal strip 2 based on the electrical signal output from the rangefinder 11. i And will represent the detected deviation amount s i The electrical signal is output to the control device 13. Specifically, if the rangefinder 11 is made to scan towards the side where the angle θ increases from 0, then as Figure 4 As shown, the measured value l of the rangefinder 11 θ The reduction is significant at the end face (points A to D) of metal strip 2. This measured value can be expressed mathematically as l. θ The changes in l are shown in equations (1) and (2) below. Here, l θi The measured value l of the rangefinder 11 corresponding to the end face of the metal strip 2 of the i-th layer. θ .

[0034] [Formula 1]

[0035] Before end face inspection

[0036]

[0037] [Equation 2]

[0038] After end face inspection

[0039]

[0040] Therefore, the deviation detector 12 is based on the measurement value l of the rangefinder 11. θThe angle θ at a rapidly changing moment i The deviation of the i-th layer of metal strip 2 is detected. That is, the angle θ when the deviation of the i-th layer of metal strip 2 is 0 is detected. i Let it be θ a0 Then, the deviation detector 12 calculates the deviation amount s of the i-th layer of metal strip 2 using the following equation (3). i Here, l θa0 The value l measured by the rangefinder 11 when the deviation of the metal strip 2 in the i-th layer is 0. θ .

[0041] [Formula 3]

[0042]

[0043] Control device 13 controls the deviation of the metal strip 2 in the i-th layer, as detected by deviation detector 12, to a certain extent. i Within the specified range. Specifically, the control device 13 corrects the deviation of the metal strip 2 in the i-th layer by tilting the steering roller that is directly connected to the metal strip 2 in the i-th layer.

[0044] As can be seen from the above description, in the metal strip misalignment control device 10, which is one embodiment of the present invention, the misalignment detector 12 uses heights h and h i Angle θ i and the measured value l of the rangefinder 11 θ The width-direction end position of each layer of metal strip 2 is calculated, and the deviation amount s of each layer of metal strip 2 is calculated based on the calculated width-direction end position. i Therefore, the deviation of the metal strip 2 in the loop 1 can be detected in any layer in a space-saving and cost-effective manner.

[0045] The embodiments of the invention made by the inventors have been described above, but the invention is not intended to be limited by the description and drawings based on these embodiments, which are part of the disclosure of this invention. For example, a feature of this invention is that the metal strip is used in places where multiple layers are overlapped, and therefore it can also be applied to places other than loopers (e.g., near the junction of metal strips in cases where multiple metal strip transfer devices are provided). Thus, other embodiments, examples, and operating techniques made by those skilled in the art based on these embodiments are all included within the scope of this invention.

[0046] Industrial applicability

[0047] According to the present invention, a method for detecting the deviation of metal strip can be provided, which can save space and cost in any layer to detect the deviation of metal strip within the loop. Furthermore, according to the present invention, a method for controlling the deviation of metal strip can be provided, which can save space and cost in any layer to detect the deviation of metal strip within the loop and thus correct the deviation of the metal strip.

[0048] Explanation of reference numerals in the attached figures

[0049] 1. Loop;

[0050] 2. Metal strips, 2a, 2b, 2c, and 2d;

[0051] 3. Steering rollers;

[0052] 4. Loose-hitched carts;

[0053] 10. Misalignment control device for metal strip;

[0054] 11. Distance measuring instrument (reference point);

[0055] 12 deviation detectors;

[0056] 13. Control device.

Claims

1. A method for detecting the deviation of metal strip, wherein the deviation of metal strip traveling in multiple overlapping layers with gaps is detected, characterized in that, Include: The first step is to calculate the width direction end position of the metal strip in each layer using the angle between the reference direction (arbitrarily determined from the reference point) and the direction connecting the reference point and the width direction end position of the metal strip in each layer, the distance between the reference point and the width direction end position of the metal strip in each layer, and the distance between the reference point and the straight line extending along the width direction of the metal strip. The second step is to calculate the deviation of the metal strip in each layer based on the end position in the width direction calculated in the first step.

2. The method for detecting the deviation of metal strip according to claim 1, The first step includes the following steps: making the rangefinder scan around the reference point as the center, and according to the relationship between the scanning angle and the detection value of the rangefinder, setting the scanning angle where the detection value changes drastically as the angle between the reference direction and the direction connecting the reference point and the width direction end position of the metal strip of each layer.

3. A method for controlling the misalignment of metal strip, characterized in that, The method includes the following steps: controlling the deviation of the metal strip based on the deviation amount detected by the metal strip deviation detection method according to claim 1 or 2.

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