Flatness measuring device, hot rolling plant and method for operating a flatness measuring device
By using flatness measuring devices on the feed side, discharge side, and intermediate deflection rollers in hot rolling equipment, the strip position deviation is detected and the deflection roller angle is adjusted, thus solving the problem of lateral deviation of hot-rolled strip and achieving stable operation and accurate measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SMS GROUP GMBH
- Filing Date
- 2021-08-12
- Publication Date
- 2026-06-05
AI Technical Summary
When measuring the flatness of hot-rolled strip in hot rolling equipment, the strip is prone to lateral deviation, which leads to increased equipment wear, decreased winding quality, and interference with flatness measurement. Existing methods cannot effectively control the operation of the strip.
A flatness measuring device with feed side, discharge side and intermediate deflection roller is adopted. By detecting the deviation between the actual position of the strip and the target position, the angle and position of the deflection roller are adjusted to ensure stable operation of the strip.
It effectively prevents lateral deviation of the strip, ensures the accuracy of flatness measurement, reduces equipment wear, and improves winding quality and measurement accuracy.
Smart Images
Figure CN115989095B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a flatness measuring device for measuring the flatness of hot-rolled strip within a hot rolling mill. The device includes at least one feed-side deflector roller for contacting a first large side of the hot-rolled strip; at least one discharge-side deflector roller for contacting the first large side of the hot-rolled strip; and an intermediate deflector roller, arranged between the feed-side and discharge-side deflector rollers with respect to the strip's running direction, adjustable relative to a second large side of the hot-rolled strip opposite to the first large side, serving as a flatness measuring roller. Furthermore, this invention relates to a hot rolling mill having at least one flatness measuring device.
[0002] The present invention also relates to a method for a flatness measuring device for measuring the flatness of hot-rolled strip operating in a hot rolling mill, wherein the flatness measuring device has at least one feed-side deflector roller for contacting a first large side of the hot-rolled strip, at least one discharge-side deflector roller for contacting the first large side of the hot-rolled strip, and an intermediate deflector roller, which is adjustable relative to a second large side opposite to the first large side of the hot-rolled strip and serves as a flatness measuring roller, arranged between the feed-side and discharge-side deflector rollers with respect to the strip running direction of the hot-rolled strip. Background Technology
[0003] If the metal strip is guided over a long distance within the facility, it is particularly important that there are methods and / or devices that allow control over the strip's movement. These methods and / or devices influence the strip's movement in a way that prevents lateral deviation. If lateral deviation is not prevented, the metal strip may collide with the facility's lateral boundaries and be damaged. In the worst-case scenario, this can lead to process interruption or even strip breakage, which, in such often continuous processes, is considered a serious accident with significant costs.
[0004] When measuring flatness in a hot rolling mill for steel, one possible location for the measuring device is between the cooling section and the drive rolls of the hot rolling mill. Since measuring flatness requires winding a flatness measuring roll—which deflects the metal strip and is therefore also referred to as a deflection roll in the context of this invention—the measuring roll must be submerged in the metal strip. Once the measuring roll is submerged, a configuration consisting of three deflection rolls is formed: a feed-side roller table roll as a deflection roll, a measuring roll as a deflection roll, and a discharge-side roller table roll as a deflection roll.
[0005] This configuration significantly increases the risk of strip misalignment. In particular, thin metal strips are prone to unstable lateral misalignment. In these cases, it becomes practically impossible to measure flatness using measuring rollers. Wear on the facility's lateral guides will increase significantly, the winding quality of the strip coil will deteriorate considerably, and the risk of warping or strip breakage will increase. Lateral misalignment of the metal strip also causes stress distortion, which interferes with flatness measurements. This interference makes it impossible to measure linear flatness errors.
[0006] In continuous processes handling metal strip, such as in continuous annealing furnaces and galvanizing lines, arched deflector rollers and deflector rollers mounted on oscillating frames are known. The arched deflector rollers produce a centering effect due to the redistribution of tensile stress caused by the arching. The oscillating frame is controlled by an adjuster based on the measured center position of the strip. A problem arises when cold-rolling slitting hot-rolled strip, as the hot-rolled strip also exhibits a strong tendency to lateral deviation due to its tapered strip structure. This disturbance in the rolling process is addressed by oscillating deflector rollers positioned directly before the coiler. This measure allows the strip to return to a centered running position.
[0007] Using these known methods assumes that the strip is continuously under strip tension. Hot rolling presents entirely different clamping conditions with long sections where the strip is guided with little or no strip tension. Compared to the deflection rolls commonly found in cold rolling, this clamping condition requires devices and methods capable of controlling the strip in a triple deflection configuration. Furthermore, conventional adjustment methods fail due to the significantly longer clamping length between the final rolling stand and the flatness measuring rolls, and the associated long downtime.
[0008] The link https: / / www.emg-automation.com / automation / bandlaufregelen / provides information on regulating strip movement during the winding and unwinding of metal strip, as well as in continuous equipment based on optical strip center measurement. However, devices designed for this purpose cannot be used in the roller conveyors of hot rolling mills. Furthermore, such devices cannot compensate for interference in flatness measurements.
[0009] Patent document JP 2012 206 132A discloses a rolling mill comprising rolls for rolling material, a winding roll arranged downstream of the rolls and wound with the material to be rolled, and a deflector roll that changes the feed direction of the rolled material already rolled by the rolls, so as to guide the rolled material to the winding roll. When rolling is performed using the rolling mill, the state of surface defects generated in the rolled material wound on the winding roll is detected. Based on the detected state of surface defects, one end of the deflector roll is moved in a direction perpendicular to the central axis of the deflector roll, thereby suppressing the generation of surface defects.
[0010] Patent document EP 3 097 990 A1 discloses a cold rolling mill that uses a heating device to heat sequentially conveyed steel sheets and then sequentially cold rolls the steel sheets using a cold rolling mill. The cold rolling mill includes a zigzag motion correction device arranged and configured upstream of the heating device along the steel sheet conveying direction to correct zigzag motion of the steel sheet conveyed to the heating device. Furthermore, the cold rolling mill includes a zigzag motion suppression device arranged between the heating device and the cold rolling mill and configured to suppress zigzag motion of the steel sheet associated with cold rolling using the cold rolling mill. Additionally, the cold rolling mill includes a controller configured to control the zigzag motion correction device to perform a zigzag motion correction operation to correct zigzag motion of the steel sheet conveyed to the heating device. Furthermore, the controller controls the zigzag motion suppression device to perform a zigzag motion suppression operation to suppress zigzag motion of the steel sheet associated with cold rolling. When the controller controls the zigzag motion correction device to perform zigzag motion correction operation, the controller controls the zigzag motion suppression device to perform zigzag motion suppression operation according to a time period.
[0011] Patent document DE 195 24 729A1 discloses an apparatus for rolling strip having a non-uniform thickness distribution and / or length distribution along its width. The apparatus includes at least one control roll arranged on the feed and / or discharge side of a rolling mill and capable of oscillating relative to the strip, a device for detecting the tensile stress distribution along the strip width, and an adjustment device that derives an adjustment signal from the detected tensile stress distribution to an adjustment device to cause the control roll to oscillate. Summary of the Invention
[0012] One object of the present invention is to prevent the hot-rolled strip from lateral deviation in the hot rolling equipment during the flatness measurement of the hot-rolled strip.
[0013] This objective is achieved by the independent claims. Advantageous designs are presented in the following description, dependent claims, and drawings, wherein each design individually or in combination of at least two designs may demonstrate an improved, particularly preferred, or advantageous aspect of the invention. The design of the flatness measuring device may correspond herein to the design of the method, and vice versa, even if not explicitly mentioned in certain instances below.
[0014] The flatness measuring device according to the invention for measuring the flatness of hot-rolled strip in a hot rolling mill comprises at least one feed-side deflector roller for contacting a first large side of the hot-rolled strip, at least one discharge-side deflector roller for contacting the first large side of the hot-rolled strip, at least one intermediate deflector roller arranged between the feed-side and discharge-side deflector rollers with respect to the strip running direction of the hot-rolled strip, adjustable relative to a second large side of the hot-rolled strip opposite to the first large side of the hot-rolled strip, serving as a flatness measuring roller, at least one detection device for detecting the actual position of the hot-rolled strip, and at least one adjustment device connected to at least one of the detection device and the deflector roller, the adjustment device being configured to change the angle between the longitudinal centerline of the deflector roller connected accordingly to the adjustment device and the transverse longitudinal axis of the flatness measuring device extending from the deflector roller based on the deviation of the actual position of the hot-rolled strip from a predetermined target position of the hot-rolled strip.
[0015] The detection device for detecting the actual position of the hot-rolled strip can be arranged close to the intermediate deflection roll. Specifically, the detection device can be arranged before or after the intermediate deflection roll. Preferably, the detection device is arranged directly on the intermediate deflection roll. More preferably, the detection device is arranged at a distance of no more than 1 m from the intermediate deflection roll. The detection device can be configured to determine the position of the hot-rolled strip by flatness measurements and / or by tensile measurement signals from a force gauge located below the bearing of one of the deflection rolls.
[0016] Because the length of the hot-rolled strip clamped between the flatness measuring device and the finishing mill of the hot rolling mill is very large, the strip running becomes very unstable when the intermediate deflection roll, used as the flatness measuring roll, sinks in, making the hot-rolled strip prone to lateral deviation. This can be reliably prevented by the flatness measuring device according to the invention, which influences or corrects the strip running by changing the angle between the longitudinal centerline of the deflection roll, which is connected to the adjusting device, and the longitudinal axis of the flatness measuring device, based on the instantaneous deviation between the actual position of the hot-rolled strip and a predetermined target position of the hot-rolled strip. Using this invention, the central position of the strip can be controlled, particularly when measuring flatness in the discharge roller table of the hot rolling mill. Without this invention, the hot-rolled strip would strongly laterally deviate during flatness measurement, necessitating interruption of the process. This problem occurs particularly in the case of hot-rolled strips with thin strip thickness. However, it is especially necessary to measure the flatness of these hot-rolled strips.
[0017] When measuring flatness, one can measure, for example, the distribution of tensile stress in hot-rolled strip.
[0018] The feed-side deflector roller used to contact the first large side of the hot-rolled strip, such as the lower side, i.e., the lower wide side, can in particular be a roller in a roller table through which the rolled hot-rolled strip can be conveyed to a flatness measuring device. Conversely, the term "upper wide side" therefore refers to the opposite large side of the hot-rolled strip, i.e., the upper wide side.
[0019] The first large side of the hot-rolled strip that comes into contact with it, such as the lower discharge side deflector roller, can be a roller table roll. The hot-rolled strip, measured by a flatness measuring device, can be conveyed to the drive roller unit of the hot-rolling equipment before the coiler of the hot-rolling equipment.
[0020] The intermediate deflection roll is used as a flatness measuring roll. Specifically, in a top view looking at one of the large sides of the hot-rolled strip, the intermediate deflection roll is arranged between the feed-side deflection roll and the discharge-side deflection roll with respect to the strip's running direction. To measure flatness, the intermediate deflection roll can be adjusted relative to a second large side, such as the upper side, of the hot-rolled strip opposite the first large side. For this purpose, the intermediate deflection roll is connected to an actuator for adjusting the intermediate deflection roll and evaluation electronics for assessing the mechanical load on the intermediate deflection roll.
[0021] The detection device for detecting the actual position of hot-rolled strip may, for example, have at least one optical sensor, such as a camera. Furthermore, the detection device may have evaluation electronics for processing the signals from the optical sensor. The detection device may, for example, be configured to detect the actual position of the middle portion of the hot-rolled strip as the feed-side actual position of the hot-rolled strip.
[0022] The adjustment device can be connected, for example, only to the feed-side deflection roller to change its position according to the invention, thereby enabling open-loop and / or closed-loop control (adjustment) of the actual position of the hot-rolled strip, more precisely, the center position of the strip, according to the invention. With the aid of the adjustment device, the feed-side deflection roller can, for example, oscillate in the horizontal plane to change the angle between the longitudinal centerline of the feed-side deflection roller and the longitudinal axis of the flatness measuring device according to the invention. The change in the angle between the longitudinal centerline of the feed-side deflection roller and the longitudinal axis of the flatness measuring device can correspond to a change in the angle between the longitudinal centerline of the deflection roller and the longitudinal axis of the hot rolling mill, wherein the longitudinal axis of the hot rolling mill is defined by two points: the roll gap center of the last mill stand of the finishing mill and the clamping gap center of the drive roll assembly before the coiler. The angle between the longitudinal centerline of the feed-side deflection roller and the longitudinal axis of the flatness measuring device can be, for example, in the range of + / -10 mm / m, preferably in the range of + / -15 mm / m, and particularly preferably in the range of + / -50 mm / m.
[0023] Alternatively, the adjusting device may be connected only to the discharge-side deflection roller or the intermediate deflection roller to enable movement of the respective deflection roller according to the invention for open-loop and / or closed-loop control (adjustment) of the strip operation. Alternatively, the adjusting device may be connected to two or all of the deflection rollers to enable movement of the deflection rollers according to the invention for open-loop and / or closed-loop control (adjustment) of the strip operation. To perform the movement of two or more deflection rollers, these deflection rollers may be moved individually by a common actuator of the adjusting device or by individual or their own actuators.
[0024] The angle that can be changed according to the invention for the corresponding movable or oscillating deflector roller is derived between the longitudinal centerline of the corresponding deflector roller pointing transversely to the strip running direction and the longitudinal axis of the flatness measuring device extending transversely to the deflector roller, wherein the longitudinal axis of the flatness measuring device may be the same as the longitudinal axis of the hot rolling mill. In particular, the angle may be located in the horizontal plane.
[0025] The adjustment device may have at least one regulator, by means of which the angle between the longitudinal centerline of the corresponding deflection roller and the longitudinal axis of the flatness measuring device can be changed according to the deviation between the actual position of the hot-rolled strip and a predetermined target position of the hot-rolled strip. The regulator may have a center regulator, which is used to determine a target value for the oscillation position of the corresponding deflection roller based on the deviation between the actual position of the hot-rolled strip and the predetermined target position, i.e., the corresponding difference between the actual position and the predetermined target position of the hot-rolled strip. The strip running of the hot-rolled strip can be corrected by using this target value. The center regulator may be configured as a PI regulator.
[0026] According to an advantageous design, the adjustment device is configured to determine the actual position of the deflection roller connected to the adjustment device, determine the target position of the deflection roller by the deviation between the actual position of the hot-rolled strip and a predetermined target position of the hot-rolled strip, and determine a target adjustment speed value for adjusting the angle between the longitudinal centerline of the deflection roller and the longitudinal axis of the flatness measuring device based on the deviation between the actual position and the target position of the deflection roller. Thus, the adjustment speed of the corresponding deflection roller oscillation can be quickly and individually adapted to the instantaneous conditions of the strip's movement. For this purpose, the adjustment device can have an oscillation adjuster configured to determine the adjustment speed value by the deviation between the actual position and the target position of the deflection roller connected to the adjustment device, i.e., by the corresponding difference between the actual position and the target position of the deflection roller. This adjustment device can correct strip misalignment in the hot-rolled strip. The oscillation adjuster can be constructed as a pure P-adjuster.
[0027] According to another advantageous design, the adjusting device is configured to determine the speed of the lateral movement of the hot-rolled strip and to determine a target adjusting speed value based on the speed of the lateral movement of the hot-rolled strip. For this purpose, the adjusting device may have a differential regulator configured to determine an additional value for the oscillation speed of the deflection roller connected to the adjusting device based on the speed of the lateral movement of the hot-rolled strip on the feed side. This additional value, along with the adjusting speed determined by the oscillation regulator, can be added to generate the target adjusting speed value for controlling the actuator of the adjusting device.
[0028] According to another advantageous design, the adjustment device is configured to oscillate deflection rollers and / or at least one additional deflection roller connected to the adjustment device in a plane arranged perpendicular to the longitudinal axis of the flatness measuring device, and to oscillate the corresponding deflection rollers in the plane according to an angle value, so that the angle between the longitudinal center axis of the corresponding deflection roller and the longitudinal axis of the flatness measuring device can be changed by the adjustment device. For example, if the angle between the longitudinal center axis of the feed-side deflection roller used for strip motion control and the longitudinal axis of the flatness measuring device changes, the relatively small distance between the deflection roller and the intermediate deflection roller will negatively affect the flatness measurement due to the change in the geometry of the clamping of the hot-rolled strip in the flatness measuring device. To compensate for this interference, the deflection rollers and / or at least one additional deflection roller oscillate or move in a plane arranged perpendicular to the longitudinal axis of the flatness measuring device, for example, a vertical plane, thereby balancing the change in the geometry of the clamping of the hot-rolled strip in the flatness measuring device.
[0029] Therefore, the length difference Δl between the edges of the hot-rolled strip can be determined by means of an adjustment device based on the oscillation amount SB of the deflection roller, whose longitudinal centerline changes angle between its longitudinal centerline and the longitudinal axis of the flatness measuring device. Here, the expression Δl = f(SB, geometry) can be applied to the length difference Δl, where the length difference Δl is a function of the oscillation amount SB and the clamping geometry. Based on this length difference, the vertical oscillation amount SM of the deflection roller, used to compensate for changes in the clamping geometry, can be determined by means of the adjustment device. This oscillation amount minimizes the disturbance caused by the horizontal oscillation motion of the deflection roller, whose longitudinal centerline changes angle between its longitudinal centerline and the longitudinal axis of the flatness measuring device. Here, the expression SM = f(Δl = 0, geometry) can be held for the oscillation amount SM, where the oscillation amount SM is a function of the length difference Δl and the clamping geometry. This oscillation amount SM can be directly or via a ramp and set to the actuator of the adjustment device. Here, the oscillation amount SM can also be calculated directly, where SM = f(SB, geometry), meaning the oscillation amount SM can be a function of the oscillation amount SB and the clamping geometry. The relationship between the oscillation amount SM and the oscillation amount SB can be established such that the clamping length of the hot-rolled strip on the operating side of the flatness measuring device is the same as the clamping length on the driving side. To improve online capability, or more precisely to simplify the use of compensation in an online system, the relationship between the oscillation amount SM and the oscillation amount SB can be calculated offline, and this relationship can be stored in the adjustment device in tabular form. The oscillation motion used to compensate for changes in the clamping geometry of the hot-rolled strip in the flatness measuring device can be performed solely by the feed-side deflection roller, the discharge-side deflection roller, or the intermediate deflection roller. Alternatively, this compensation can be performed by using two or all of these deflection rollers. To perform the movement of two or more deflection rollers, these rollers can be moved individually by means of a common actuator of the adjustment device or by using separate or their own actuators of the adjustment device.
[0030] According to another advantageous design, the deflection rollers, each connected to an adjustment device, are movable about a rotation axis extending perpendicular to the feed section of the hot-rolled strip. This rotation axis passes through the center of the deflection rollers connected to the adjustment device, or is offset relative to the center of the deflection rollers about their longitudinal axis. Specifically, this rotation axis can be arranged at the center of the respective deflection roller or offset relative to the operating or driving side.
[0031] According to another advantageous design, the adjusting device has at least one electromechanical drive connected to deflection rollers respectively connected to the adjusting device. The electromechanical drive is, for example, a lead screw drive, or the adjusting device has at least one hydraulic adjusting cylinder connected to the deflection rollers.
[0032] According to another advantageous design, the flatness measuring device has at least one retaining frame on which the feed-side deflector roller, the discharge-side deflector roller, and / or an intermediate deflector roller are rotatably supported. The adjusting device is connected to the retaining frame via the respective deflector rollers, and the retaining frame can move together with the deflector rollers respectively connected thereto. Two or all of the deflector rollers can also be supported on the retaining frame to allow for their coordinated movement to optimize the flatness measurement.
[0033] According to another advantageous design, at least one deflection roller has a roller body surface with improved roughness. This can improve the control effect of the corresponding deflection roller on the strip movement.
[0034] According to another advantageous design, at least one deflection roller has an abrasion-resistant roller body coating. This roller body coating can be, for example, a ceramic coating, such as a tungsten carbide coating.
[0035] According to another advantageous design, the detection equipment is arranged and configured to detect the actual position of the hot-rolled strip on the feed side or the actual position of the hot-rolled strip on the discharge side. The actual position of the hot-rolled strip on the feed side should be understood as the actual position of the hot-rolled strip before it contacts the feed-side deflector rollers upon entering the flatness measuring device. The actual position of the hot-rolled strip on the discharge side should be understood as the actual position of the hot-rolled strip after it has been deflected by the discharge-side deflector rollers upon exiting the flatness measuring device.
[0036] The hot rolling mill according to the invention has at least one flatness measuring device according to one of the above-described designs or a combination of at least two of these designs. The advantages mentioned above regarding the flatness measuring device are correspondingly associated with this hot rolling mill.
[0037] According to the method of the flatness measuring device for operating a flatness measuring device to measure the flatness of hot-rolled strip in a hot rolling mill, the flatness measuring device includes at least one feed-side deflector roller for contacting a first large side of the hot-rolled strip, at least one discharge-side deflector roller for contacting the first large side of the hot-rolled strip, and an intermediate deflector roller, which is arranged between the feed-side and discharge-side deflector rollers with respect to the strip running direction of the hot-rolled strip and is adjustable relative to a second large side of the hot-rolled strip opposite to the first large side of the hot-rolled strip, and serves as a flatness measuring roller. The method detects the actual position of the hot-rolled strip and changes the angle between the longitudinal centerline of the at least one deflector roller and the transverse longitudinal axis of the flatness measuring device extending from the deflector roller according to the deviation of the actual position of the hot-rolled strip from a predetermined target position of the hot-rolled strip.
[0038] The advantages mentioned above regarding the flatness measuring device are correspondingly related to the method described above. In particular, the method can be performed using a flatness measuring device according to one of the above designs or a combination of at least two of these designs.
[0039] According to the advantageous design scheme, the actual position of the deflection roller, whose position can be changed accordingly, is determined; the target position of the deflection roller is determined by the deviation of the actual position of the hot-rolled strip from a predetermined target position of the hot-rolled strip; and the target adjustment speed value for adjusting the angle between the longitudinal centerline of the deflection roller and the longitudinal axis of the flatness measuring device is determined based on the deviation of the actual position of the deflection roller from the target position of the deflection roller. The advantages mentioned above regarding the corresponding design scheme of the flatness measuring device are correspondingly associated with this design scheme.
[0040] According to another advantageous design scheme, the speed of the lateral movement of the hot-rolled strip is determined, and the target adjustment speed value is determined based on the speed of the lateral movement of the hot-rolled strip. The advantages mentioned above regarding the corresponding design scheme of the flatness measuring device are correspondingly associated with this design scheme.
[0041] According to another advantageous design, the deflection rollers, whose positions can be adjusted accordingly, or at least one additional deflection roller, oscillate in a plane perpendicular to the longitudinal axis of the flatness measuring device. The oscillation of each deflection roller in this plane is performed according to an angle value, so that the angle between the longitudinal centerline of the respective deflection roller and the longitudinal axis of the flatness measuring device can be changed. The advantages mentioned above regarding the corresponding design of the flatness measuring device are correspondingly associated with this design. Attached Figure Description
[0042] The invention will now be explained by way of example with reference to the accompanying drawings and preferred embodiments, wherein the features explained below may individually or in combination of at least two of these features demonstrate advantageous or improved aspects of the invention. Wherein:
[0043] Figure 1A A schematic top view of one embodiment of the flatness measuring device according to the present invention is shown;
[0044] Figure 1B It shows Figure 1A A schematic side view of the flatness measuring device shown; and
[0045] Figure 2 A flowchart of an embodiment of the method according to the present invention is shown. Detailed Implementation
[0046] Identical or functionally identical components are given the same reference numerals in the drawings. Repeated descriptions of these components may be omitted.
[0047] Figure 1A A schematic top view of an embodiment of a flatness measuring device 1 according to the invention for measuring the flatness of hot-rolled strip 2 in a hot rolling mill (not shown) is shown.
[0048] The flatness measuring device 1 has a feed-side deflector roller 3 for contacting the lower large side of the hot-rolled strip 2. The feed-side deflector roller 3 is part of the feed-side roller table, which also includes two other guide rollers 4. The feed-side deflector roller 3 may have a roller body surface with improved roughness. Furthermore, the feed-side deflector roller 3 may have an anti-wear roller body coating (not shown).
[0049] Furthermore, the flatness measuring device 1 has a discharge-side deflection roller 5 for contacting the lower large side of the hot-rolled strip 2. The discharge-side deflection roller 5 is part of the discharge-side roller table, and another guide roller 4 of the roller table is also shown. The discharge-side deflection roller 5 may have a roller body surface with improved roughness. In addition, the discharge-side deflection roller 5 may have an anti-wear roller body coating (not shown).
[0050] Furthermore, the flatness measuring device 1 includes an intermediate deflection roller 7, arranged between the feed-side deflection roller 3 and the discharge-side deflection roller 5 with respect to the strip running direction 6 of the hot-rolled strip 2. This intermediate deflection roller 7 is adjustable relative to the second largest side of the hot-rolled strip 2, which is located above the first largest side of the hot-rolled strip 2. This intermediate deflection roller 7 serves as a flatness measuring roller and may have a roller body surface with improved roughness. Additionally, the intermediate deflection roller 7 may have an anti-wear roller body coating (not shown).
[0051] Furthermore, the flatness measuring device 1 has a detection device 8 for detecting the actual position of the hot-rolled strip 2. This detection device 8 may have at least one optical sensor (not shown), such as a camera.
[0052] The flatness measuring device 1 further includes an adjustment device 9 connected to the detection device 8, the feed-side deflector roller 3, and the intermediate deflector roller 7. This adjustment device 9 is configured to change the angle α between the longitudinal centerline 10 of the feed-side deflector roller 3 and the longitudinal axis 11 of the flatness measuring device 1 extending transversely to the deflector rollers 3, 5, and 7, based on the deviation of the actual position of the hot-rolled strip 2 from a predetermined target position of the hot-rolled strip 2. For illustration, the feed-side deflector roller 3 is shown in two swing positions, one as a solid line and the other as a dashed line, where the horizontal swingability of the feed-side deflector roller 3 is indicated by double arrows 12. For this purpose, the feed-side deflector roller 3 can move about a rotation axis (not shown) perpendicular to the section of the hot-rolled strip 2 fed to the feed-side deflector roller 3 and extending perpendicularly to the plane shown, wherein this rotation axis is offset relative to the center of the feed-side deflector roller 3 about the longitudinal axis 10 of the feed-side deflector roller 3. The adjustment device 9 has an electromechanical drive device (not shown) connected to the feed-side deflection roller 3 or a hydraulic adjustment cylinder connected to the feed-side deflection roller 3.
[0053] The adjustment device 9 is used to determine the actual position of the feed-side deflection roller 3; to determine the target position of the feed-side deflection roller 3 based on the deviation of the actual position of the hot-rolled strip 2 from a predetermined target position of the hot-rolled strip 2; and to determine the target adjustment speed value for adjusting the angle α between the longitudinal centerline 10 of the feed-side deflection roller 3 and the longitudinal axis 11 of the flatness measuring device 1 based on the deviation of the actual position of the feed-side deflection roller 3 from the target position of the feed-side deflection roller 3. Furthermore, the adjustment device 9 is used to determine the lateral movement speed of the hot-rolled strip 2, and to determine the target adjustment speed value based on the lateral movement speed of the hot-rolled strip 2.
[0054] Furthermore, the adjustment device 9 is also used to make the intermediate deflection roller 7 swing in a plane perpendicular to the longitudinal axis 11 of the flatness measuring device 1 and perpendicular to the plane shown in the figure. In addition, the adjustment device 9 is used to make the intermediate deflection roller 7 swing in the plane according to the angle value, so that the angle α between the longitudinal center axis 10 of the feed-side deflection roller 3 and the longitudinal axis 11 of the flatness measuring device 1 can be changed by the adjustment device 9.
[0055] The flatness measuring device 1 may include a retaining frame (not shown), on which the feed-side deflection roller 3, the discharge-side deflection roller 5 and / or the intermediate deflection roller 7 are rotatably supported. The adjusting device 9 is connected to the corresponding deflection roller 3, 5 or 7 via the retaining frame, and the retaining frame can move together with the deflection roller 3, 5 or 7 connected thereto.
[0056] Figure 1B It shows Figure 1A The diagram shows a schematic side view of the flatness measuring device 1. The vertical swing capability of the intermediate deflection roller 7 is shown, with one line solid and the other dashed, where the vertical swing capability of the intermediate deflection roller 7 is indicated by double arrows 13.
[0057] Figure 2 A flowchart illustrating an embodiment of a method for a flatness measuring apparatus according to the present invention for measuring the flatness of hot-rolled strip operating within a hot rolling mill is shown. The flatness measuring apparatus can be based on... Figure 1A and Figure 1B The embodiments shown are constructed accordingly.
[0058] First, detect the actual position L of the hot-rolled strip. Ist The actual position L of the hot-rolled strip Ist and the pre-given target position L Soll The difference is generated by the subtractor D1 of the adjustment device, and this difference is fed to the center adjuster M of the flatness measuring device. The center adjuster M generates the target position P of the deflection roller connected to the adjustment device based on this difference. Soll This target position optimizes the strip operation of hot-rolled strip. Furthermore, the actual position P of the deflection roller connected to the detection and adjustment equipment is monitored. Ist The actual position P of the deflection roller Ist and the target position P of the deflection roller Soll An additional difference is generated by a subtractor D2 in the adjustment device, which is then fed to the oscillation adjuster S of the flatness measuring device. The oscillation adjuster S generates an adjustment speed value based on the difference D2, used to adjust the angle between the longitudinal centerline of the deflection roller connected to the adjustment device and the longitudinal axis of the flatness measuring device. The difference generated by the subtractor D1 is further fed to the differential adjuster D of the adjustment device, which determines the speed of the lateral movement of the hot-rolled strip and, based on this speed, determines an additional value for adjusting the speed. The adjustment speed value generated by the oscillation adjuster S and the additional value generated by the differential adjuster D are added by the adder A of the adjustment device to produce the target adjustment speed value V. Soll The target adjustment speed value can be used to control the actuator of the adjustment device.
[0059] Therefore, according to the method, based on the actual position L of the hot-rolled strip Ist Relative to a predetermined target position L of the hot-rolled strip Soll The deviation is used to change the angle between the longitudinal centerline of the deflection roller connected to the adjustment device and the transverse longitudinal axis of the deflection roller. Here, according to the method described, the actual position P of the deflection roller, whose position connected to the adjustment device can be changed accordingly, is determined. Ist The actual position L of the hot-rolled strip Ist Relative to a predetermined target position L of the hot-rolled strip Soll The deviation is determined by adjusting the target position P of the deflection roller connected to the equipment. Soll And according to the actual position P of the deflection roller Ist Relative to the target position P of the deflection roller Soll The deviation is used to determine the target adjustment speed increment for adjusting the angle between the longitudinal centerline of the deflection roller connected to the adjustment device and the longitudinal axis of the flatness measuring device. Furthermore, according to the method, the speed of the lateral movement of the hot-rolled strip is determined, and the target adjustment speed increment is determined based on the speed of the lateral movement of the hot-rolled strip.
[0060] To compensate for changes in the geometry of the hot-rolled strip clamped in the flatness measuring device, this change is caused by adjustments to the deflection rollers connected to the adjustment device. This allows the deflection rollers, whose positions can be changed accordingly, or another deflection roller of the flatness measuring device, to oscillate in a plane perpendicular to the longitudinal axis of the flatness measuring device. The oscillation of these deflection rollers in this plane can be adjusted according to an angle value, thereby changing the angle between the longitudinal centerline of the deflection roller, whose oscillation has caused a geometric change, and the longitudinal axis of the flatness measuring device.
[0061] List of reference numerals
[0062] 1. Flatness measuring device
[0063] 2 Hot-rolled strip
[0064] 3. Feed-side deflection roller
[0065] 4 guide rollers
[0066] 5. Discharge side deflection roller
[0067] 6. Strip running direction
[0068] 7. Intermediate deflection roller
[0069] 8. Testing equipment
[0070] 9. Adjust the equipment
[0071] 10 3 longitudinal centerline
[0072] 11 1 longitudinal axis
[0073] 12. Double arrow (3-way oscillation)
[0074] 13 Double arrow (7's swayability)
[0075] A Adder
[0076] D Differential Regulator
[0077] D1 Subtractor
[0078] D2 Subtractor
[0079] The actual location of List 2
[0080] Lsoll 2 target position
[0081] M-center regulator
[0082] The actual positions of Pist 3, 5, and 7
[0083] Target positions of Psoll 3, 5, and 7
[0084] S-Swing Adjuster
[0085] Vsoll target adjustment speed value
[0086] The angle between α10 and α11.
Claims
1. A flatness measuring device (1) for measuring the flatness of hot-rolled strip (2) in a hot rolling mill, the flatness measuring device having at least one feed-side deflection roller (3) for contacting a first large side of the hot-rolled strip (2), at least one discharge-side deflection roller (5) for contacting the first large side of the hot-rolled strip (2), and at least one intermediate deflection roller (7) arranged between the feed-side deflection roller (3) and the discharge-side deflection roller (5) with respect to the strip running direction (6) of the hot-rolled strip (2), the intermediate deflection roller being adjustable relative to a second large side of the hot-rolled strip (2) opposite to the first large side of the hot-rolled strip (2) and used as a flatness measuring roller, characterized in that, The flatness measuring device has a function for detecting the actual position (L) of the hot-rolled strip (2). Ist At least one detection device (8) and at least one adjustment device (9) connected to the detection device (8) and at least one of the deflection rollers (3, 5, 7), the adjustment device being used to adjust the position (L) of the hot-rolled strip (2) according to the actual position (L) of the hot-rolled strip (2). Ist ) relative to the pre-given target position (L) of the hot-rolled strip (2) Soll The deviation of the flatness measuring device (1) is used to change the angle between the longitudinal centerline (10) of the deflection rollers (3, 5, 7) connected to the adjustment device (9) and the longitudinal axis (11) of the flatness measuring device (1) extending transversely to the deflection rollers (3, 5, 7). α ).
2. The flatness measuring device (1) according to claim 1, characterized in that, The adjustment device (9) is used to determine the actual position (P) of the deflection rollers (3, 5, 7) connected to the adjustment device (9). Ist ), used for the actual position (L) of the hot-rolled strip (2) Ist ) relative to the pre-given target position (L) of the hot-rolled strip (2) Soll The target position (P) of the deflection rollers (3, 5, 7) is determined by the deviation of the rollers. Soll ), and for determining the actual position (P) of the deflection rollers (3, 5, 7). Ist The target position (P) relative to the deflection rollers (3, 5, 7) Soll The deviation is used to determine the angle between the longitudinal centerline (10) of the deflection rollers (3, 5, 7) and the longitudinal axis (11) of the flatness measuring device (1). α ) target adjustment speed value (V) Soll ).
3. The flatness measuring device (1) according to claim 2, characterized in that, The adjustment device (9) is used to determine the speed of the lateral movement of the hot-rolled strip (2) and to determine the target adjustment speed value (V) based on the speed of the lateral movement of the hot-rolled strip (2). Soll ).
4. The flatness measuring device (1) according to any one of claims 1 to 3, characterized in that, The adjusting device (9) is used to swing one deflection roller (3, 5, 7) and / or at least one other deflection roller (3, 5, 7) connected to the adjusting device (9) in a plane arranged perpendicular to the longitudinal axis (11) of the flatness measuring device (1), and to swing the corresponding deflection roller (3, 5, 7) in the plane according to an angle value, so that the angle between the longitudinal center axis (10) of the corresponding deflection roller (3, 5, 7) and the longitudinal axis (11) of the flatness measuring device (1) can be changed by the adjusting device (9). α ).
5. The flatness measuring device (1) according to any one of claims 1 to 3, characterized in that, The deflection rollers (3, 5, 7) connected to the adjustment device (9) are capable of moving around a rotation axis that extends perpendicularly to the strip section of the hot-rolled strip (2) that can be conveyed to the deflection rollers (3, 5, 7), wherein the rotation axis passes through the center of the deflection rollers (3, 5, 7) or is offset relative to the center of the deflection rollers (3, 5, 7) about the longitudinal central axis (10) of the deflection rollers (3, 5, 7).
6. The flatness measuring device (1) according to any one of claims 1 to 3, characterized in that, The adjustment device (9) has at least one electromechanical drive connected to the deflection rollers (3, 5, 7) respectively connected to the adjustment device (9), or has at least one hydraulic adjustment cylinder connected to the deflection rollers (3, 5, 7).
7. The flatness measuring device (1) according to any one of claims 1 to 3, characterized in that, The flatness measuring device has at least one retaining frame, and the feed-side deflection roller (3), the discharge-side deflection roller (5) and / or the intermediate deflection roller (7) are rotatably supported on the retaining frame, wherein the adjusting device (9) is connected to the corresponding deflection rollers (3, 5, 7) through the retaining frame and the retaining frame is movable together with the corresponding deflection rollers (3, 5, 7) connected to the retaining frame.
8. The flatness measuring device (1) according to any one of claims 1 to 3, characterized in that, At least one deflection roller (3, 5, 7) has a roller body surface with improved roughness.
9. The flatness measuring device (1) according to any one of claims 1 to 3, characterized in that, At least one deflection roller (3, 5, 7) has an abrasion-resistant roller body coating.
10. The flatness measuring device (1) according to any one of claims 1 to 3, characterized in that, The detection device (8) is used to detect the actual position (L) of the feed side of the hot-rolled strip (2). Ist ) or the actual position (L) of the hot-rolled strip (2) on the discharge side. Ist ).
11. A hot rolling mill having at least one flatness measuring device (1), characterized in that, The flatness measuring device (1) is constructed according to any one of claims 1 to 10.
12. A method for a flatness measuring device (1) used to measure the flatness of hot-rolled strip (2) operating within a hot rolling mill, wherein, The flatness measuring device (1) has at least one feed-side deflector roller (3) for contacting the first large side of the hot-rolled strip (2), at least one discharge-side deflector roller (5) for contacting the first large side of the hot-rolled strip (2), and at least one intermediate deflector roller (7) arranged between the feed-side deflector roller (3) and the discharge-side deflector roller (5) with respect to the strip running direction (6) of the hot-rolled strip (2). The intermediate deflector roller is adjustable relative to the second large side of the hot-rolled strip (2) opposite to the first large side of the hot-rolled strip (2) and can be used as a flatness measuring roller. The method is characterized by detecting the actual position (L) of the hot-rolled strip (2). Ist ), and according to the actual position (L) of the hot-rolled strip (2) Ist ) relative to the pre-given target position (L) of the hot-rolled strip (2) Soll The deviation of the flatness measuring device (1) is used to change the angle between the longitudinal centerline (10) of at least one deflection roller (3, 5, 7) and the longitudinal axis (11) extending transversely to the deflection roller (3, 5, 7). α ).
13. The method according to claim 12, characterized in that, The method includes determining the actual position (P) of the deflection rollers (3, 5, 7) whose positions can be changed accordingly. Ist ), determined by the actual position (L) of the hot-rolled strip (2) Ist ) relative to the pre-given target position (L) of the hot-rolled strip (2) Soll The deviation of the deflection rollers (3, 5, 7) determines the target position (P). Soll ), and according to the actual position (P) of the deflection rollers (3, 5, 7) Ist The target position (P) relative to the deflection rollers (3, 5, 7) Soll The deviation is determined to adjust the angle between the longitudinal centerline (10) of the deflection rollers (3, 5, 7) and the longitudinal axis (11) of the flatness measuring device (1). α ) target adjustment speed value (V) Soll ).
14. The method according to claim 13, characterized in that, The method includes determining the speed of the lateral movement of the hot-rolled strip (2), and determining the target adjustment speed value (V) based on the speed of the lateral movement of the hot-rolled strip (2). Soll ).
15. The method according to any one of claims 12 to 14, characterized in that, One deflector roller (3, 5, 7) and / or at least one other deflector roller (3, 5, 7) whose position can be changed accordingly oscillate in a plane perpendicular to the longitudinal axis (11) of the flatness measuring device (1), and the oscillation of the corresponding deflector roller (3, 5, 7) in the plane is based on the angle between the longitudinal centerline (10) of the corresponding deflector roller (3, 5, 7) and the longitudinal axis (11) of the flatness measuring device (1). α It can be done by changing the angle value.