Abstract: A control device 20 obtains second pressing forces acting on work-side and drive-side roll chocks 112A and 112B on the basis of entry side and exit side first pressing forces, and controls at least one of work roll position control devices 140B and 141B and at least one of work roll pressing devices 130B and 131B changing a position of at least one of the roll chocks 112A and 112B in such a manner that a difference between the work-side second pressing force and the drive-side second pressing force is equal to or smaller than a predetermined value.

Abstract: A state quantity prediction device includes: a first differential predictive value calculation unit configured to deal with a nonlinear component of a function whose variables are dynamic characteristics of the state quantity with respect to the input parameter and a difference value between a past predictive value of the state quantity and a predictive value of the physical model, input the input parameter and the past predictive value of the state quantity, and include a learned neutral network for outputting a first differential predictive value; a second differential predictive value calculation unit configured to deal with a linear component of the function, input the input parameter and the past predictive value, and output a second differential predictive value; and a state quantity predictive value calculation unit configured to calculate a predictive value of the state quantity.

Abstract: Angles of an upper-side pair of an upper work roll 110A and an upper backup roll 120A, and a lower-side pair of a lower work roll 110B and a lower backup roll 120B are adjusted in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. Thereafter, work-roll pressing apparatuses 130A and 130B, work-roll position control apparatuses 140A and 140B, backup-roll pressing apparatuses 150A and 150B, and backup-roll position control apparatuses 160A and 160B are controlled such that the angles of the upper work roll 110A and the lower work roll 110B are adjusted in a state where the angles of the upper backup roll 120A and the lower backup roll 120B are maintained.

Abstract: A hot rolling mill 1 includes a control apparatus 20 that adjusts an angle formed between an upper-side pair of an upper backup roll 120A and an upper work roll 110A and a lower-side pair of a lower backup roll 120B and a lower work roll 110B in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. The hot rolling mill 1 is configured such that the work rolls 110A and 110B satisfy the condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rolls 110A and 110B, and Lb is the maximum strip width of a rolled material, and the hot rolling mill 1 performs rolling in a state where a bending force is applied to the work rolls.

Abstract: There are provided a work-side position measurement device and a drive-side position measurement device for directly measuring positions of roll chocks in a rolling direction, and positions of upper and lower working rolls and upper and lower backup rolls in the rolling direction are adjusted to zero point or predetermined positions. Alternatively, a change caused in the strip wedge due to a minute crossing of the axes of working rolls and backup rolls is calculated, and the quantities of leveling of a work-side rolling reduction cylinder device and a drive-side rolling reduction cylinder device are adjusted to make the strip edge equal to or smaller than a predetermined value. Accordingly, the bilateral asymmetry (strip wedge) of the thickness distribution of a rolled material is easily adjusted even in the event that the positions of the roll chocks in the rolling direction are changed due to wear on various components.

Abstract: When a portion for measuring the plating adhesion amount reaches an upstream side position, plating adhesion amount estimation values are calculated by using a plating adhesion amount estimation expression at positions away from a position that faces the distance sensors, that is, the upstream side position, by strip-width direction distances, of the surfaces of the steel strip. When the portion for measuring the plating adhesion amount reaches a downstream side position, the strip-width direction distances of the plating adhesion amount meters are matched to the strip-width direction distances, and the plating adhesion amount actual measurement values are obtained. The plating adhesion amount estimation expression is corrected on the basis of the differences between the plating adhesion amount estimation values and the plating adhesion amount actual measurement values. Accordingly, the control accuracy of the plating adhesion amount is improved.

Abstract: There are provided a work-side position measurement device and a drive-side position measurement device for directly measuring positions of roll chocks in a rolling direction, and positions of upper and lower working rolls and upper and lower backup rolls in the rolling direction are adjusted to zero point or predetermined positions. Alternatively, a change caused in the strip wedge due to a minute crossing of the axes of working rolls and backup rolls is calculated, and the quantities of leveling of a work-side rolling reduction cylinder device and a drive-side rolling reduction cylinder device are adjusted to make the strip edge equal to or smaller than a predetermined value. Accordingly, the bilateral asymmetry (strip wedge) of the thickness distribution of a rolled material is easily adjusted even in the event that the positions of the roll chocks in the rolling direction are changed due to wear on various components.

Abstract: A method for controlling a wet flue gas desulfurization device includes a step of constructing a first learning model by machine learning of a relationship between a future sulfur dioxide concentration at an outlet of the absorption tower, and operation data of the combustion device and operation data of the wet flue gas desulfurization device including a circulation flow rate of the absorption liquid, a step of creating, by using the first learning model, a first relationship table between a circulation flow rate of the absorption liquid at first time and a sulfur dioxide concentration in an effluent gas flowing out of the absorption tower at second time which is time in the future relative to the first time, a step of deciding, based on the first relationship table, the circulation flow rate of the absorption liquid at the first time, at which the sulfur dioxide concentration in the effluent gas at the second time is not more than a preset set value, and a step of adjusting an operation condition of the at

Abstract: In a decision control device of a control system, a predetermined pass schedule is decided by adjusting the rolling force per unit width at a last stand of a hot finishing tandem rolling mill to cause the edge profile on the outlet side of the last stand to fall within an allowable range based on the relationship between a strip crown and the edge profile on the outlet side of the last stand with respect to the rolling force per unit width and a strip shape control parameter, obtained regarding the last stand, and adjusting the strip shape control parameter of the last stand to cause the strip shape on the outlet side of the last stand to fall within an allowable range and cause the strip crown to become a predetermined value or smaller.

Abstract: When a portion for measuring the plating adhesion amount reaches an upstream side position, plating adhesion amount estimation values are calculated by using a plating adhesion amount estimation expression at positions away from a position that faces the distance sensors, that is, the upstream side position, by strip-width direction distances, of the surfaces of the steel strip. When the portion for measuring the plating adhesion amount reaches a downstream side position, the strip-width direction distances of the plating adhesion amount meters are matched to the strip-width direction distances, and the plating adhesion amount actual measurement values are obtained. The plating adhesion amount estimation expression is corrected on the basis of the differences between the plating adhesion amount estimation values and the plating adhesion amount actual measurement values. Accordingly, the control accuracy of the plating adhesion amount is improved.

Abstract: A sampling unit samples an actual measurement value related to a driving result during a period of a driving under a known driving condition in order to process a material having different properties for each time zone. A driving result estimation unit obtains an estimated value related to the driving result from a value of the known driving condition and a value of an unknown driving condition. A condition estimation unit estimates the value of the unknown driving condition so that a difference between the actual measurement value related to the driving result and the estimated value related to the driving result is reduced.

Abstract: There are provided a work-side position measurement device and a drive-side position measurement device for directly measuring positions of roll chocks in a rolling direction, and positions of upper and lower working rolls and upper and lower backup rolls in the rolling direction are adjusted to zero point or predetermined positions. Alternatively, a change caused in the strip wedge due to a minute crossing of the axes of working rolls and backup rolls is calculated, and the quantities of leveling of a work-side rolling reduction cylinder device and a drive-side rolling reduction cylinder device are adjusted to make the strip edge equal to or smaller than a predetermined value. Accordingly, the bilateral asymmetry (strip wedge) of the thickness distribution of a rolled material is easily adjusted even in the event that the positions of the roll chocks in the rolling direction are changed due to wear on various components.

Abstract: In a decision control device of a control system, a predetermined pass schedule is decided by adjusting the rolling force per unit width at a last stand of a hot finishing tandem rolling mill to cause the edge profile on the outlet side of the last stand to fall within an allowable range based on the relationship between a strip crown and the edge profile on the outlet side of the last stand with respect to the rolling force per unit width and a strip shape control parameter, obtained regarding the last stand, and adjusting the strip shape control parameter of the last stand to cause the strip shape on the outlet side of the last stand to fall within an allowable range and cause the strip crown to become a predetermined value or smaller.

Abstract: Provided are hot rolling equipment and a hot rolling method for precisely controlling the meandering and plate shape of a steel strip, thereby making it possible to prevent tail end squeezing of the steel strip. Hot rolling equipment (10) for this purpose, for sequentially passing a steel strip (1) through rolling machines (11, 12) and thereby rolling the steel strip (1), wherein a plurality of split rolls (63) capable of contacting the steel strip (1) is provided between the rolling machines (11, 12), and, when the split rolls (63) contact the steel strip (1), detection torques (Td, Tw) acting on the left and right ends of the split rolls (63) are detected by torque detectors (67a, 67b), the reduction leveling of the rolling machines (11, 12) being adjusted on the basis of the detected detection torques (Td, Tw) to control the meandering and plate shape of the steel strip (1).

Abstract: Provided are hot rolling equipment and a hot rolling method for precisely controlling the meandering and plate shape of a steel strip, thereby making it possible to prevent tail end squeezing of the steel strip. Hot rolling equipment (10) for this purpose, for sequentially passing a steel strip (1) through rolling machines (11, 12) and thereby rolling the steel strip (1), wherein a plurality of split rolls (63) capable of contacting the steel strip (1) is provided between the rolling machines (11, 12), and, when the split rolls (63) contact the steel strip (1), detection torques (Td, Tw) acting on the left and right ends of the split rolls (63) are detected by torque detectors (67a, 67b), the reduction leveling of the rolling machines (11, 12) being adjusted on the basis of the detected detection torques (Td, Tw) to control the meandering and plate shape of the steel strip (1).