Metal strip winding device and metal strip winding method

Abstract

The present invention provides a metal strip winding device that can suppress winding misalignment when winding a metal strip using a tension reel. [Solution] The metal strip winding device includes a deflector roll section that changes the conveying direction of the metal strip from one conveying direction to another conveying direction, and a winding section provided on the other conveying direction as seen from the deflector roll section and winding the metal strip. The metal strip winding device also includes a first pinch roll section provided on the one conveying direction as seen from the deflector roll section and in contact with the upper surface of the metal strip, and a second pinch roll section provided between the deflector roll section and the winding section in the other conveying direction and in contact with the upper surface of the metal strip.

Description

Technical Field

[0001] The present invention relates to a metal strip winding device and a metal strip winding method, comprising: a deflector roll unit that changes the conveying direction of a metal strip from one conveying direction to another conveying direction; and a winding unit that winds the metal strip.

Background Art

[0002] Winding devices for winding a metal strip such as a steel strip into a coil shape are provided in annealing equipment, plating equipment, rolling equipment, metal strip surface inspection equipment, and the like. A metal strip winding device includes a tension reel for winding a metal strip, a deflector roll provided upstream of the tension reel, and a pinch roll disposed opposite the deflector roll.

[0003] Here, when winding a metal strip with a tension reel, so-called winding misalignment may occur, in which the metal strip is wound in a state displaced in the width direction of the metal strip. As a method for preventing winding misalignment of a metal strip, an edge position control method (hereinafter also referred to as EPC method) is performed, in which the position of the end portion in the width direction of the metal strip is detected on the upstream side of the deflector roll, and the mandrel of the tension reel is moved in accordance with the position of the end portion.

[0004] However, after the metal strip is cut on the upstream side of the sensor, or after the tail end of the metal strip passes the sensor, it is difficult to suppress winding misalignment by the EPC method. Therefore, winding misalignment of the metal strip is prevented by applying a pressing force in the width direction during winding of the metal strip.

[0005] For example, Patent Document 1 discloses that a press roll biased inward from the axial outside of a tension reel is used to hold down the outer peripheral surface of the coil of the metal strip being wound.

[0006] Furthermore, measures are taken to suppress the lifting of the steel strip upstream of the pinch roll when the leading edge of the steel strip passes through the pinch roll. For example, Patent Document 2 discloses a winding device equipped with a pressing roll provided upstream of the pinch roll and above the steel strip.

[0007] Furthermore, the reduction pressure of the pinch rolls is also controlled according to the thickness of the metal strip. For example, Patent Document 3 discloses a method for controlling the reduction pressure of pinch rolls that are tapered, with the diameter of the axial end gradually decreasing, and are installed opposite a deflector roll. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 7-178449 [Patent Document 2] Japanese Patent Publication No. 2016-22485 [Patent Document 3] Japanese Patent Publication No. 2016-74023 [Overview of the project] [Problems that the invention aims to solve]

[0009] Here, the metal strip may lift up and meander as it passes through the deflector roll. In this case, even if the outer surface of the coil is held down with a tension reel as in Patent Document 1, there is a problem of misalignment of the metal strip during winding.

[0010] Furthermore, in Patent Document 2, since the pressing roll is located upstream of the pinch roll, it is not possible to prevent the metal strip from lifting up after passing the position of the pressing roll, which leads to the problem of misalignment of the metal strip during winding.

[0011] Patent Document 3 describes a problem where, if the metal strip has shape defects such as ear waves, the pressing force on the ends of the metal strip in the width direction decreases, causing the metal strip to become misaligned during winding.

[0012] This invention has been made in view of the above-mentioned problems, and aims to provide a metal strip winding device and a metal strip winding method that can suppress winding misalignment when winding a metal strip with a tension reel. [Means for solving the problem]

[0013] To solve the above problems, the present invention has the following features.

[0014] [1] A metal strip winding device comprising: a deflector roll section for changing the conveying direction of a metal strip from one conveying direction to another conveying direction; and a winding section provided on the other conveying direction as seen from the deflector roll section and for winding the metal strip, A metal strip winding device comprising: a deflector roll section for changing the conveying direction of a metal strip from one conveying direction to another conveying direction; and a winding section provided on the other conveying direction as seen from the deflector roll section and for winding the metal strip, A first pinch roll portion is provided in the first conveying direction as viewed from the deflector roll portion and is in contact with the upper surface of the metal strip, A metal strip winding device having a second pinch roll portion provided between the deflector roll portion and the winding portion in the other conveying direction and in contact with the upper surface of the metal strip. [2] The metal strip winding device according to [1], wherein the first pinch roll portion has a first contact point in the first conveying direction where the metal strip contacts the deflector roll portion, and the first contact point is located downstream in the first conveying direction from the line connecting the rotation axis of the first pinch roll portion and the rotation axis of the deflector roll portion. [3] The metal strip winding device according to [1] or [2], wherein the second pinch roll portion is located upstream of the line connecting the rotation axis of the second pinch roll portion and the rotation axis of the deflector roll portion in the other conveying direction, at the second contact point where the metal strip contacts the deflector roll portion in the other conveying direction. [4] A metal strip winding device according to any one of [1] to [3], wherein the metal strip contacts the deflector roll portion from a first contact point that contacts the deflector roll portion in one conveying direction to a second contact point that contacts the deflector roll portion in the other conveying direction. [5] A first distance adjustment unit for adjusting the first distance between the first pinch roll portion and the metal strip, A second distance adjustment unit for adjusting the second distance between the second pinch roll portion and the metal strip, It has a tip position acquisition unit that acquires the position of the tip of the metal strip, A metal strip winding device according to any one of [1] to [4], wherein the first distance adjustment unit and the second distance adjustment unit adjust the first distance and the second distance to be longer according to the position of the leading edge of the metal strip. [6] A first distance adjustment unit for adjusting the first distance between the first pinch roll portion and the metal strip, A second distance adjustment unit for adjusting the second distance between the second pinch roll portion and the metal strip, It includes a tail end position acquisition unit that acquires the position of the tail end of the metal strip, A metal strip winding device according to any one of [1] to [5], wherein the first distance adjustment unit and the second distance adjustment unit adjust the first distance and the second distance to be longer according to the position of the tail end of the metal strip. [7] A method for winding a metal strip using a deflector roll section that changes the conveying direction of the metal strip from one conveying direction to another conveying direction, A first pressing step in which the upper surface of the metal strip is pressed with the first pinch roll portion from the side in the conveying direction, A method for winding a metal strip, comprising a second pressing step of pressing the upper surface of the metal strip with a second pinch roll from the other conveying direction side. [8] A first distance adjustment step for adjusting the first distance between the first pinch roll portion and the metal strip, a second distance adjusting step of adjusting a second distance between said second pinch roll portion and said metal strip; a leading end position acquiring step of acquiring a position of a leading end of said metal strip, the method for winding a metal strip according to [7], wherein the first distance adjusting step and the second distance adjusting step perform adjustment to increase the first distance and the second distance in accordance with said position of the leading end of said metal strip. [9] a first distance adjusting step of adjusting a first distance between said first pinch roll portion and said metal strip; a second distance adjusting step of adjusting a second distance between said second pinch roll portion and said metal strip; a trailing end position acquiring step of acquiring a position of a trailing end of said metal strip, the method for winding a metal strip according to [7] or [8], wherein the first distance adjusting step and the second distance adjusting step perform adjustment to increase the first distance and the second distance in accordance with said position of the trailing end of said metal strip. Effects of the Invention

[0015] According to the metal strip winding device and the like pertaining to the present invention, the device comprises: a first pinch roll portion provided on one conveyance direction side and contacting the metal strip; and a second pinch roll portion provided on the other conveyance direction side and contacting the metal strip. This makes it possible to press the metal strip along the curved surface of the deflector roll portion. As a result, lifting of the metal strip from the deflector roll portion can be suppressed, the contact area of the metal strip with the deflector roll portion increases, and winding displacement can be suppressed. Brief Description of the Drawings

[0016] [Figure 1] It is an explanatory diagram showing an outline of a metal strip winding device. [Figure 2] It is an explanatory diagram showing operating modes of a first pinch roll portion and a second pinch roll portion. [Figure 3]This is an explanatory diagram showing how force is applied to the metal strip by the deflector roll section, the first pinch roll section, and the second pinch roll section. [Figure 4] This is a functional block diagram of a metal strip winding device. [Figure 5] This is a flowchart illustrating the winding method for metal strips. [Figure 6] This is an explanatory diagram showing the manner of the tip position acquisition process in step S01 of step 5. [Figure 7] This is an explanatory diagram showing the configuration of the first pressing step in step S02 and the second pressing step in step S03 in Figure 5. [Figure 8] Figure 5 is an explanatory diagram showing the configuration of the first distance adjustment step in step S04 and the second distance adjustment step in step S05. [Figure 9] Figure 5 is an explanatory diagram showing the configuration of the tail end position acquisition process in step S06. [Figure 10] This is an explanatory diagram showing the configuration of the first pressing step in step S07 and the second pressing step in step S08 in Figure 5. [Figure 11] This is an explanatory diagram showing the configuration of the first distance adjustment step in step S09 and the second distance adjustment step in step S10 in Figure 5. [Figure 12] This is a schematic diagram illustrating the cross-section of a coil. [Modes for carrying out the invention]

[0017] The inventors have found that in conventional metal strip winding devices, a phenomenon occurs where the metal strip lifts locally away from the deflector roll as it passes through the deflector roll. They have also found that this lifting causes the metal strip to meander, which can lead to miswinding of the metal strip coil on the tension reel. The present invention is based on these findings and suppresses miswinding of the metal strip coil by preventing the lifting of the metal strip as it passes through the deflector roll.

[0018] The present invention will be described below through embodiments of the invention. Figure 1 shows an overview of a metal strip winding device. The metal strip winding device 100 is a device for winding a metal strip MS, which is installed, for example, in an annealing facility, a plating facility, a rolling facility, a metal strip surface inspection facility, etc.

[0019] The metal strip winding device 100 has a deflector roll section 10 that changes the conveying direction of the metal strip MS from one conveying direction TD1 to another conveying direction TD2. The metal strip winding device 100 also has a tension reel 20 which is provided on the other conveying direction TD2 as viewed from the deflector roll section 10 and serves as a winding section for winding the metal strip MS.

[0020] The deflector roll section 10 is formed in a cylindrical shape. The metal strip MS comes into contact with the outer surface of the deflector roll section 10, thereby changing the conveying direction of the metal strip MS. In the example shown in Figure 1, the deflector roll section 10 changes the conveying direction of the metal strip MS from one conveying direction TD1 to another conveying direction TD2.

[0021] The deflector roll section 10 may be driven by an electric motor or it may be undriven and follow the transport of the metal strip MS. When the deflector roll section 10 is driven by an electric motor, it is controlled to rotate in sync with the transport speed of the metal strip MS.

[0022] Hereinafter, the upper surface of the metal strip MS as viewed from one transport direction TD1 and the other transport direction TD2 will also be referred to as the front surface. The lower surface of the metal strip MS as viewed from one transport direction TD1 and the other transport direction TD2 will also be referred to as the back surface.

[0023] The metal strip winding device 100 has a first pinch roll section 31 provided on one conveying direction TD1 side and in contact with the surface of the metal strip MS, and a second pinch roll section 32 provided on the other conveying direction TD2 side and in contact with the surface of the metal strip MS. Specifically, the first pinch roll section 31 is provided on one conveying direction TD1 as viewed from the deflector roll section 10. The second pinch roll section 32 is provided between the deflector roll section 10 and the tension reel 20 in the other conveying direction TD2.

[0024] The first pinch roll portion 31 and the second pinch roll portion 32 are formed in a cylindrical shape. In the example shown in Figure 1, the first pinch roll portion 31 and the second pinch roll portion 32 are arranged to face the surface side of the metal strip MS and the deflector roll portion 10.

[0025] The first pinch roll section 31 and the second pinch roll section 32 press against the surface of the metal strip MS before and after the contact area between the metal strip MS and the deflector roll section 10. As a result, the metal strip MS adheres closely to the deflector roll section 10 as it passes through it.

[0026] The first pinch roll section 31 and the second pinch roll section 32 may be driven by electric motors, or they may be undriven and follow the transport of the metal strip MS. When the first pinch roll section 31 and the second pinch roll section 32 are driven by electric motors, control is performed to synchronize their rotation with the transport speed of the metal strip MS.

[0027] The tension reel 20 is a device for winding a metal strip MS into a coil. The tension reel 20 winds the metal strip MS into a coil by winding it around a mandrel, which serves as the core during winding. Alternatively, a cylindrical component called a sleeve may be attached to the mandrel, and the metal strip MS may be wound around the sleeve.

[0028] The diameter of the mandrel or sleeve is determined by specifications such as the inner diameter of the product after the metal strip MS has been wound into a coil. The diameter of the mandrel or sleeve can be, for example, 600 to 780 mm.

[0029] The tension reel 20 may be equipped with a belt wrapper 21 as an ancillary device, which guides the metal strip MS with a belt so that the metal strip MS is smoothly wrapped around the tension reel 20.

[0030] The tension reel 20 is driven, for example, by an electric motor, and vector control is performed so that the tension applied to the metal strip MS is a predetermined value through torque control. The tension applied to the metal strip MS is the tension between the bridle roll 40 (described later) and the tension reel 20, and is, for example, 10 to 30 MPa.

[0031] The rotation center of the tension reel 20 and the rotation center of the deflector roll section 10 are, for example, 3000 mm apart horizontally. Furthermore, the rotation center of the tension reel 20 is 2000 mm apart vertically from the rotation center of the deflector roll section 10.

[0032] In this case, the diameters of the first pinch roll section 31 and the second pinch roll section 32 are preferably 200 to 300 mm. Furthermore, it is preferable that the diameters of the first pinch roll section 31 and the second pinch roll section 32 are approximately the same. By making the diameters of the first pinch roll section 31 and the second pinch roll section 32 approximately the same, the peripheral speeds of both can be easily matched.

[0033] If the diameters of the first pinch roll section 31 and the second pinch roll section 32 are less than 200 mm, the pressing force on the surface of the metal strip MS may become insufficient due to the axial deflection of the first pinch roll section 31 and the second pinch roll section 32.

[0034] Furthermore, if the diameters of the first pinch roll section 31 and the second pinch roll section 32 exceed 300 mm, the distance between the rotation center of the first pinch roll section 31 and the rotation center of the second pinch roll section 32 needs to be increased. As a result, the effect of imparting sufficient bending to the metal strip MS may be reduced.

[0035] The metal strip winding device 100 may be provided with a bridle roll 40 and a shear 50 upstream of the deflector roll section 10 in one conveying direction TD1. The bridle roll 40 and the shear 50 may be provided as needed depending on the embodiment.

[0036] The bridle roll 40 is constructed by arranging multiple drive rolls at an angle to, for example, one conveying direction TD1. In the example shown in Figure 1, the bridle roll 40 has a pair of drive rolls 41, 42 provided on the upstream side of one conveying direction D1, and a pair of drive rolls 43, 44 provided on the downstream side.

[0037] The bridle roll 40 generates tension through frictional force between the drive rolls 41-44 and the metal strip MS by guiding the metal strip MS along an S-shape using a pair of drive rolls 41-42 and a pair of drive rolls 43-44. The bridle roll 40 controls the tension of the metal strip MS upstream and downstream to predetermined values.

[0038] The shear 50 cuts the metal strip MS by shearing with a pair of parallel blades. The shear 50 cuts the metal strip MS when, for example, the winding length of the metal strip MS on the tension reel 20 reaches the product length.

[0039] Furthermore, when the metal strip MS is cut by the shear 50, the tail end of the metal strip MS is wound up by the tension reel 20. Subsequently, the tension reel 20 being wound up is switched, and the tip of the subsequent metal strip MS is wound onto the new tension reel 20.

[0040] The control unit 60 controls the operation of the metal strip winding device 100. The control unit 60 also tracks the metal strip MS. The tracking is not particularly limited, but is calculated using, for example, the rotational speed of the rolls that transport the metal strip MS, the diameter of the rolls, etc.

[0041] Therefore, the control unit 60 can detect the timing at which at least one of the leading end and trailing end of the metal strip MS passes through predetermined equipment such as the deflector roll section 10 and the tension reel 20.

[0042] Figure 2 shows the operation of the first pinch roll section 31 and the second pinch roll section 32. As shown in Figure 2, the first pinch roll section 31 and the second pinch roll section 32 are housed in a casing 33.

[0043] The casing 33 is box-shaped and houses the first pinch roll section 31 and the second pinch roll section 32, each of which is pivotally supported so as to be rotatable around the axis of the rotating shaft.

[0044] The first pinch roll portion 31 and the second pinch roll portion 32 are provided such that a portion of them protrudes from the casing 33. In other words, the casing 33 houses the first pinch roll portion 31 and the second pinch roll portion 32 so as not to interfere with the metal strip MS when they come into contact with the metal strip MS.

[0045] The casing 33 is connected to the actuator 34. The actuator 34 moves the casing 33, thereby moving the first pinch roll section 31 and the second pinch roll section 32 closer to or further away from the metal strip MS. In this embodiment, the actuator 34 moves the first pinch roll section 31 and the second pinch roll section 32 closer to or further away from the metal strip MS and the deflector roll section 10.

[0046] In the example shown in Figure 2, the first pinch roll section 31 and the second pinch roll section 32 are housed in one casing 33. However, the first pinch roll section 31 and the second pinch roll section 32 may be housed individually in two casings 33. In that case, actuators 34 may be provided in each casing 33, and these actuators 34 may be operated individually.

[0047] Figure 3 shows how force is applied to the metal strip MS by the deflector roll section 10, the first pinch roll section 31, and the second pinch roll section 32. When the metal strip MS is conveyed from one conveying direction TD1, it comes into contact with the deflector roll section 10 at the first contact point C1. When the metal strip MS is conveyed from the deflector roll section 10 toward the other conveying direction TD2, it separates from the deflector roll section 10 at the second contact point C2.

[0048] The first pinch roll section 31 is positioned upstream of the first contact point C1 in the first transport direction TD1. The first contact point C1 is located downstream of the line L1 connecting the rotation axis CP1 of the first pinch roll section 31 and the rotation axis CD of the deflector roll section 10 in the first transport direction TD1. The first contact point C1 can be measured, for example, by irradiating it with laser light from the first transport direction TD1.

[0049] Furthermore, the second pinch roll section 32 is positioned downstream of the second contact point C2 in the other transport direction TD2. The second contact point C2 is located upstream of the line L2 connecting the rotation axis CP2 of the second pinch roll section 32 and the rotation axis CD of the deflector roll section 10 in the other transport direction TD2. The second contact point C2 can be measured, for example, by irradiating it with laser light from the other transport direction TD2.

[0050] The first pinch roll portion 31 is in contact with the metal strip MS at point P1. As a result, the metal strip MS receives a force F1 from the first pinch roll portion 31. The second pinch roll portion 32 is in contact with the metal strip MS at point P2. As a result, the metal strip MS receives a force F2 from the second pinch roll portion 32.

[0051] As described above, the first pinch roll section 31 and the second pinch roll section 32 are positioned facing the surface side of the metal strip MS and the deflector roll section 10. Furthermore, the first pinch roll section 31 and the second pinch roll section 32 move toward the deflector roll section 10. Therefore, forces F1 and F2 become forces directed toward the rotation axis CD of the deflector roll section 10.

[0052] In this way, the forces F1 and F2 act on the metal strip MS, causing it to adhere closely to the deflector roll section 10. As a result, the metal strip MS adheres closely to the deflector roll section 10 from the first contact point C1 to the second contact point C2. Force F3 is the force that the metal strip MS receives from the deflector roll section 10. In this way, the forces F1 to F3 act on the metal strip MS, making it possible to bring it into close contact with the first contact point C1 to the second contact point C2.

[0053] Furthermore, forces F1 and F2 should be such that the metal strip MS can be tightly attached between the first contact point C1 and the second contact point C2 without causing deformation of the metal strip MS. Forces F1 and F2 are not particularly limited, but for example, they can be 30kN. Forces F1 and F2 should be appropriately changed for metal strip MS of steel types and sizes (plate thickness, plate width, length) that are prone to winding misalignment.

[0054] The thicker the metal strip MS, the greater the moment required to keep the metal strip MS in close contact with the deflector roll section 10. Similarly, the moment on the metal strip S increases when the width of the metal strip MS is large or when the strength of the metal strip MS is high. Therefore, it is preferable to set forces F1 and F2 using at least one of the thickness, width, and strength of the metal strip MS.

[0055] Here, let L3 be the line connecting the first contact point C1 and the rotation axis CD of the deflector roll section 10. Also, let L4 be the line connecting the second contact point C2 and the rotation axis CD of the deflector roll section 10. The metal strip MS contacts the deflector roll section 10 at a contact angle α, which is the angle that line L3 makes with line L4.

[0056] In this case, if the diameter of the deflector roll portion 10 is large, the contact length between the metal strip MS and the deflector roll portion 10, that is, the distance from the first contact point C1 to the second contact point C2, becomes longer, and the effect of suppressing the lifting of the metal strip MS also increases. On the other hand, if the diameter of the deflector roll portion 10 is small, the warping of the metal strip MS wound as a coil may increase. From this viewpoint, it is preferable that the diameter of the deflector roll portion 10 be 600 to 1000 mm.

[0057] Let angle θ1 be the angle formed by lines L1 and L3. Preferably, angle θ1 is between 0 and 10°. Furthermore, it is preferable that angle θ1 is greater than 0°. If angle θ1 is less than 0°, point P1 is located downstream of the first contact point C1 in one conveying direction TD1. In such a case, since the force F1 from the first pinch roll 31 is applied at a position where the metal strip MS is already in contact with the deflector roll 10, it is difficult to effectively bring the metal strip MS into close contact with the deflector roll 10. In other words, by setting angle θ1 to 0° or greater, the metal strip MS can be effectively brought into close contact with the deflector roll 10.

[0058] Furthermore, when the angle θ1 exceeds 10°, the force F1 required to push down the metal strip MS by the first pinch roll section 31 increases. As a result, the power consumption of the bridle roll 40 increases. In other words, by keeping the angle θ1 at 10° or less, the metal strip MS can be efficiently and effectively brought into close contact with the deflector roll section 10.

[0059] Let angle θ2 be the angle formed by lines L2 and L4. Angles θ2 are preferably between 0 and 10°. Furthermore, angles θ2 are preferably greater than 0°. If angle θ2 is less than 0°, point P2 is located upstream of the second contact C2 in the other transport direction TD2.

[0060] In such a case, since the force F2 from the second pinch roll 32 is applied at a position where the metal strip MS is already in contact with the deflector roll 10, it is difficult to effectively bring the metal strip MS into close contact with the deflector roll 10. In other words, by setting the angle θ2 to 0° or greater, the metal strip MS can be effectively brought into close contact with the deflector roll 10.

[0061] Furthermore, when the angle θ2 exceeds 10°, the force F2 required to push down the metal strip MS by the second pinch roll section 32 increases. As a result, the power consumption of the tension reel 20 increases. In other words, by keeping the angle θ2 at 10° or less, the metal strip MS can be efficiently and effectively brought into close contact with the deflector roll section 10.

[0062] Figure 4 shows the functional blocks of the metal strip winding device 100. The metal strip winding device 100 includes an input / output unit 71, a storage unit 72, and a control unit 60. The input / output unit 71, the storage unit 72, and the control unit 60 are connected to each other via a bus 73 so that they can communicate with one another.

[0063] The input / output unit 71 is an interface for connecting to external devices. The input / output unit 71 is connected to the actuator 34 and the drive roller 80 that transports the metal strip MS.

[0064] The memory unit 72 is a writable non-volatile memory such as an EPROM. The memory unit 72 is not particularly limited, but for example, a storage device such as an HDD or SSD can be used. Various data, such as data transmitted from the drive roller 80, is stored in the memory unit 72.

[0065] The control unit 60 is a computer including a CPU. The control unit 60 includes a first distance adjustment unit 61 that adjusts the first distance between the first pinch roll section 31 and the metal strip MS, and a second distance adjustment unit 62 that adjusts the second distance between the second pinch roll section 32 and the metal strip MS.

[0066] The control unit 60 has a tracking processing unit 63 that tracks the positions of the leading and trailing ends of the metal strip MS. The control unit 60 also has a leading end position acquisition unit 64 that acquires the position of the leading end of the metal strip MS, and a trailing end position acquisition unit 65 that acquires the position of the trailing end of the metal strip MS.

[0067] The first distance adjustment unit 61, the second distance adjustment unit 62, the tracking processing unit 63, the tip position acquisition unit 64, and the tail end position acquisition unit 65 all function by executing a program stored in the memory unit 72.

[0068] The first distance adjustment unit 61 and the second distance adjustment unit 62 adjust the first distance between the first pinch roll unit 31 and the metal strip MS, and the second distance between the second pinch roll unit 32 and the metal strip MS, by controlling the operation of the actuator 34.

[0069] The tracking processing unit 63 calculates the positions of the leading and trailing ends of the metal strip MS based on the rotational speed of the drive roller 80, the diameter of the drive roller 80, and the like. The calculated positions of the leading and trailing ends of the metal strip MS are stored in the sequential storage unit 72.

[0070] The tip position acquisition unit 64 and the tail end position acquisition unit 65 acquire the positions of the tip and tail end of the metal strip MS, which have been calculated by the tracking processing unit 63, by reading them from the storage unit 72.

[0071] Figure 5 shows the flow of the metal strip winding method. As shown in Figure 5, when the metal strip winding device 100 is in operation, tracking of the leading and trailing ends of the metal strip MS is initiated.

[0072] The tip position acquisition unit 64 acquires the position of the tip of the metal strip MS by referring to the memory unit 72 and executes the tip position acquisition process (step S01).

[0073] When the leading edge of the metal strip MS reaches a predetermined position, the first distance adjustment unit 61 adjusts the first distance and performs a first pressing step in which the surface of the metal strip MS is pressed with the first pinch roll unit 31 from the conveying direction TD1 side (step S02).

[0074] When the leading edge of the metal strip MS reaches a predetermined position, the second distance adjustment unit 62 adjusts the second distance and performs a second pressing step in which the second pinch roll unit 32 presses the surface of the metal strip MS from the other conveying direction TD2 side (step S03).

[0075] When the position of the tip reaches a predetermined position, the first distance adjustment unit 61 adjusts the first distance to increase so as to release the pressure on the metal strip MS by the first pinch roll unit 31, and performs the first distance adjustment process (step S04).

[0076] When the tip of the second distance adjustment unit 62 passes a predetermined position, it adjusts the second distance to lengthen so as to release the pressure on the metal strip MS by the second pinch roll unit 32, and performs the second distance adjustment process (step S05).

[0077] The tail end position acquisition unit 65 acquires the position of the tail end of the metal strip MS by referring to the memory unit 72 and executes the tail end position acquisition process (step S06).

[0078] When the position of the tail end of the metal strip MS reaches a predetermined position, the first distance adjustment unit 61 adjusts the first distance and performs a first pressing step in which the metal strip MS is pressed with the first pinch roll unit 31 from the conveying direction TD1 side (step S07).

[0079] When the position of the tail end of the metal strip MS reaches a predetermined position, the second distance adjustment unit 62 adjusts the second distance and performs a second pressing step in which the metal strip MS is pressed with the second pinch roll unit 32 from the other conveying direction TD2 side (step S08).

[0080] When the position of the tail end passes a predetermined position, the first distance adjustment unit 61 adjusts the first distance to lengthen so as to release the pressure on the metal strip MS by the first pinch roll unit 31, and performs the first distance adjustment process (step S09).

[0081] When the position of the tail end passes a predetermined position, the second distance adjustment unit 62 adjusts the second distance to lengthen so as to release the pressure on the metal strip MS by the second pinch roll unit 32, and performs the second distance adjustment process (step S10).

[0082] Figure 6 shows an embodiment of the tip position acquisition process in step S01 of Figure 5. As shown in Figure 6, the detection position of the tip MS1 of the metal strip MS is set to a position where pressing of the tip MS1 by the first pinch roll section 31 can begin before the tip MS1 of the metal strip MS reaches the position where the deflector roll section 10 is provided. This position is determined, for example, according to the transport speed of the metal strip MS and the moving speeds of the first pinch roll section 31 and the second pinch roll section 32.

[0083] Figure 7 shows the first pressing step in step S02 and the second pressing step in step S03 of Figure 5. As shown in Figure 7, when the leading edge MS1 of the metal strip MS reaches the position where the deflector roll portion 10 is provided, the surface of the metal strip MS is pressed by the first pinch roll portion 31 and the second pinch roll portion 32.

[0084] Figure 8 shows the configuration of the first distance adjustment step S04 and the second distance adjustment step S05 in Figure 5. When the leading end MS1 of the metal strip MS is wound onto the tension reel 20, for example, the first and second distances are adjusted to be longer so that the pressure on the surface of the metal strip MS by the first pinch roll portion 31 and the second pinch roll portion 32 is released. The first distance adjustment step S04 and the second distance adjustment step S05 are preferably performed when the winding of the metal strip MS by the tension reel 20 has stabilized. The first distance adjustment step S04 and the second distance adjustment step S05 are preferably performed when the winding of the metal strip MS has reached 3 to 10 turns (circumferences), specifically when the length from the leading end of the metal strip MS is 8 to 20 m.

[0085] By performing the first distance adjustment step in step S04 and the second distance adjustment step in step S05 in this manner, the resistance to conveying the metal strip MS can be reduced, and the conveying speed of the metal strip MS can be increased.

[0086] Figure 9 shows an embodiment of the tail end position acquisition process in step S06 of Figure 5. As shown in Figure 9, the detection position of the tail end MS2 of the metal strip MS is set to a position where pressing of the tail end MS2 by the first pinch roll 31 can begin before the tail end MS2 of the metal strip MS reaches the position where the deflector roll 10 is provided. This position can be set in the same way as the setting position of the leading edge MS1 of the metal strip MS.

[0087] Figure 10 shows the configuration of the first pressing step S07 and the second pressing step S08 in Figure 5. As shown in Figure 10, when the tail end MS2 of the metal strip MS reaches the position where the deflector roll portion 10 is provided, the surface of the metal strip MS is pressed by the first pinch roll portion 31 and the second pinch roll portion 32.

[0088] When the tail end MS2 of the metal strip MS passes through the deflector roll section 10, no tension is applied to the tail end MS2, making it prone to meandering due to the metal strip MS lifting up. By performing the first pressing step in step S07 and the second pressing step in step S08 when the tail end MS2 of the metal strip MS passes through the deflector roll section 10, meandering of the tail end MS2 can be suppressed, and winding misalignment of the metal strip MS can be suppressed.

[0089] Furthermore, after the tail end MS2 of the metal strip MS passes the bridle roll 40, no tension is applied to the metal strip MS, making it prone to meandering. For this reason, the timing of the first pressing step in step S07 and the second pressing step in step S08 should be such that at least a portion of the metal strip S, 10 to 50 m from the tail end MS2, has passed the first pinch roll section 31.

[0090] Figure 11 shows the configuration of the first distance adjustment step S09 and the second distance adjustment step S10 in Figure 5. When the tail end MS2 of the metal strip MS passes, for example, the deflector roll section 10, the first distance and the second distance are adjusted to be longer so that the pressure on the surface of the metal strip MS by the first pinch roll section 31 and the second pinch roll section 32 is released.

[0091] Conventionally, when the leading edge of the metal strip MS passes through the deflector roll section, no tension is applied to the metal strip MS. As a result, contact between the metal strip MS and the deflector roll section 10 becomes insufficient, causing the metal strip MS to lift and meander. Similarly, when the trailing end of the metal strip MS passes through the deflector roll section 10, no tension is applied to the metal strip MS, making it more susceptible to meandering due to the metal strip S lifting up. Furthermore, even if the metal strip MS is pressed by a single pinch roll section, it is difficult to suppress the lifting of the metal strip MS.

[0092] The metal strip winding device 100 according to the present invention has a first pinch roll section 31 and a second pinch roll section 32. This makes it possible to press the metal strip MS along the curved surface of the deflector roll section 10. As a result, the contact area between the metal strip MS and the deflector roll section 10 can be increased, and winding misalignment can be suppressed.

[0093] In other words, as the metal strip MS passes through the deflector roll section 10, the metal strip MS is subjected to so-called three-point bending by forces F1, F2, and F3. This effectively suppresses the lifting of the metal strip MS away from the deflector roll section 10.

[0094] Specifically, the occurrence of so-called C-curvature in the metal strip MS is suppressed, and even when it has an ear wave shape, the width end of the metal strip MS is prevented from lifting away from the deflector roll section 10. Furthermore, even when no tension is applied to the metal strip MS as the leading or trailing end passes through the deflector roll section 10, the metal strip MS is strongly constrained by the three-point bending applied to the metal strip S, thus preventing the metal strip MS from lifting up. By suppressing the upward movement of the leading and trailing ends of the metal strip MS, meandering at the leading and trailing ends of the metal strip MS can be reduced, effectively suppressing winding misalignment when winding the metal strip MS into a coil shape on the tension reel 20.

[0095] Furthermore, the tip position acquisition step S01 and the tail end position acquisition step S06 in Figure 5 are steps that can be performed arbitrarily depending on the implementation. Also, the first distance adjustment step S04, the second distance adjustment step S05, the first distance adjustment step S09, and the second distance adjustment step S10 are steps that can be performed arbitrarily depending on the implementation. [Examples]

[0096] The aforementioned metal strip winding device was placed downstream of a continuous pickling line to form metal strip coils, and tests were conducted to check for winding misalignment during this process. The metal strips used in the tests were steel strips with a thickness of 1.8 to 8.3 mm, a width of 600 to 1900 mm, and a tensile strength of 290 to 1470 MPa.

[0097] The continuous pickling line had a maximum line speed of 500 m / min. Furthermore, when winding the leading and trailing ends of the steel strip onto the tension reel, the line speed was reduced to 80 m / min to mitigate impact forces. A tension of 10-30 MPa was applied to the steel strip between the bridle roll and the tension reel.

[0098] Here, an example in which a coil was formed by pressing a steel strip with a single pinch roll was presented as a comparative example. Furthermore, an example in which a coil was formed by pressing a steel strip with a first pinch roll section and a second pinch roll section was presented as an embodiment.

[0099] In the embodiment, the forces F1 and F2 exerted by the first pinch roll section and the second pinch roll section were kept the same. Both forces F1 and F2 were set to 30 kN.

[0100] The winding misalignment was evaluated as follows. Figure 12 schematically shows a cross-section of the coil. In the cross-section of the coil shown in Figure 12, the maximum protrusion amount D from the side is defined as the maximum protrusion amount D. The protrusion amount D is the distance from the position P1 of the nearest coil end to the position P2- of the farthest coil end in the radially outward direction from the coil axis AX. If the protrusion amount D exceeds 10 mm, it is considered "poor," and if it is 10 mm or less, it is considered "good," and the winding shape was evaluated accordingly.

[0101] As a result, the defect rate in the example was 3%, while the defect rate in the comparative example was 11%. As described above, by pressing and winding the steel strip using the first and second pinch roll sections, the occurrence of winding misalignment was significantly suppressed. [Explanation of Symbols]

[0102] 100 Metal strip winding device 10 Deflector Roll Section 20 Tension Reels 31. First pinch roll section 32 Second pinch roll section 61 1st distance adjustment section 62 2nd distance adjustment section 64 Tip position acquisition unit 65 Tail end position acquisition unit MS Metal Strip TD1 Conveying direction TD2 Other conveying directions

Claims

1. A metal strip winding device comprising: a deflector roll section for changing the conveying direction of a metal strip from one conveying direction to another conveying direction; and a winding section provided on the other conveying direction as seen from the deflector roll section and for winding the metal strip, A first pinch roll portion is provided on the first conveying direction as viewed from the deflector roll portion and is in contact with the upper surface of the metal strip, A metal strip winding device having a second pinch roll portion provided between the deflector roll portion and the winding portion in the other conveying direction and in contact with the upper surface of the metal strip.

2. The metal strip winding device according to claim 1, wherein the first contact point of the first pinch roll portion, in which the metal strip contacts the deflector roll portion in the first conveying direction, is located downstream in the first conveying direction from the line connecting the rotation axis of the first pinch roll portion and the rotation axis of the deflector roll portion.

3. The metal strip winding device according to claim 1, wherein the second pinch roll portion has a second contact point where the metal strip contacts the deflector roll portion in the other conveying direction, and this second contact point is located upstream of the line connecting the rotation axis of the second pinch roll portion and the rotation axis of the deflector roll portion in the other conveying direction.

4. The metal strip winding device according to claim 2, wherein the second pinch roll portion has a second contact point where the metal strip contacts the deflector roll portion in the other conveying direction, and this second contact point is located upstream of the line connecting the rotation axis of the second pinch roll portion and the rotation axis of the deflector roll portion in the other conveying direction.

5. The metal strip winding device according to claim 1, wherein the metal strip contacts the deflector roll portion from a first contact point that contacts the deflector roll portion in one conveying direction to a second contact point that contacts the deflector roll portion in the other conveying direction.

6. The metal strip winding device according to claim 2, wherein the metal strip contacts the deflector roll portion from a first contact point that contacts the deflector roll portion in one conveying direction to a second contact point that contacts the deflector roll portion in the other conveying direction.

7. The metal strip winding device according to claim 3, wherein the metal strip contacts the deflector roll portion from a first contact point that contacts the deflector roll portion in one conveying direction to a second contact point that contacts the deflector roll portion in the other conveying direction.

8. The metal strip winding device according to claim 4, wherein the metal strip contacts the deflector roll portion from a first contact point that contacts the deflector roll portion in one conveying direction to a second contact point that contacts the deflector roll portion in the other conveying direction.

9. A first distance adjustment unit for adjusting the first distance between the first pinch roll portion and the metal strip, A second distance adjustment unit for adjusting the second distance between the second pinch roll portion and the metal strip, It has a tip position acquisition unit that acquires the position of the tip of the metal strip, The metal strip winding device according to any one of claims 1 to 8, wherein the first distance adjustment unit and the second distance adjustment unit adjust the first distance and the second distance to be longer according to the position of the leading edge of the metal strip.

10. A first distance adjustment unit for adjusting the first distance between the first pinch roll portion and the metal strip, A second distance adjustment unit for adjusting the second distance between the second pinch roll portion and the metal strip, It includes a tail end position acquisition unit that acquires the position of the tail end of the metal strip, The metal strip winding device according to any one of claims 1 to 8, wherein the first distance adjustment unit and the second distance adjustment unit adjust the first distance and the second distance to be longer according to the position of the tail end of the metal strip.

11. A first distance adjustment unit for adjusting the first distance between the first pinch roll portion and the metal strip, A second distance adjustment unit for adjusting the second distance between the second pinch roll portion and the metal strip, It includes a tail end position acquisition unit that acquires the position of the tail end of the metal strip, The metal strip winding device according to claim 9, wherein the first distance adjustment unit and the second distance adjustment unit adjust the first distance and the second distance to be longer according to the position of the tail end of the metal strip.

12. A method for winding a metal strip using a deflector roll section that changes the conveying direction of the metal strip from one conveying direction to another conveying direction, A first pressing step in which the upper surface of the metal strip is pressed with the first pinch roll portion from the side in the conveying direction, A method for winding a metal strip, comprising a second pressing step of pressing the upper surface of the metal strip with a second pinch roll from the other conveying direction side.

13. A first distance adjustment step for adjusting the first distance between the first pinch roll portion and the metal strip, A second distance adjustment step for adjusting the second distance between the second pinch roll portion and the metal strip, The process includes a tip position acquisition step for acquiring the position of the tip of the metal strip, The method for winding a metal strip according to claim 12, wherein the first distance adjustment step and the second distance adjustment step are adjusted to lengthen the first distance and the second distance according to the position of the leading edge of the metal strip.

14. A first distance adjustment step for adjusting the first distance between the first pinch roll portion and the metal strip, A second distance adjustment step for adjusting the second distance between the second pinch roll portion and the metal strip, The process includes a tail end position acquisition step for acquiring the position of the tail end of the metal strip, The method for winding a metal strip according to claim 12 or 13, wherein the first distance adjustment step and the second distance adjustment step are adjusted to lengthen the first distance and the second distance according to the position of the tail end of the metal strip.

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