A method and system for detecting and controlling the deviation of roll gap shape control for a reversible rolling mill

Abstract

The present invention provides a method for detecting and controlling the deviation of the roll gap shape for a reversible rolling mill, including: before the rolling production of a strip mill, by setting relevant data, obtaining the data on the entrance side and the data on the exit side, and at the same time obtaining the strip shape regulation and control efficacy function corresponding to each pass of each strip shape control means; performing discretization processing on the strip shape regulation and control efficacy function, where the number of discretization segments is the same as the number of strip segments, both taking 2n segments, which is the interval of [-n, +n]; starting from the interval segment of [-n, -(n - 1)] and within the interval of [-n, +n], successively calculating the deviation amount between the corresponding pass of each strip shape regulation and control efficacy function in each interval segment and the pass without deviation, obtaining the mean deviation amount of each strip shape control means in each interval segment, and the length of each interval segment is 1; combining the control safety factor A of the strip shape regulation and control efficacy, comparing the mean deviation amount of each strip shape control means in each interval segment with h max and h min to obtain a comparison result, and adjusting the strip mill according to the comparison result.

Description

Technical Field

[0001] The present invention relates to the field of strip rolling mills, and particularly to a method and system for detecting and controlling the deviation of roll gap shape for a reversible rolling mill. Background Art

[0002] In strip rolling, the control of roll gap shape is particularly important. Rolling mills such as HC series rolling mills, UCM series rolling mills, and PC series rolling mills respectively adjust the roll gap shape of strip rolling mills through the roll system control forms of hydraulic roll bending, axial roll shifting, and roll crossing. The above technologies have been widely applied in modern rolling mills and achieved good roll gap shape control effects, which can provide guarantee for the production of flat strips. At present, the core of the roll gap shape control of strip rolling mills lies in the symmetric adjustment or proportional adjustment of the control amounts on both the operating side and the drive side. However, in actual production, key components such as mill liners, mill rolls, and roll system bearings will inevitably wear, and this wear is not uniform planar wear. Therefore, the wear of mill components further induces control deviation of roll gap shape, making the original roll gap shape control strategy no longer applicable.

[0003] At present, most of these problems are solved by manual observation and empirical judgment, and the measurement of the spatial accuracy of the roll system also needs to refer to the shutdown detection data. It can be seen that the current methods have the following problems:

[0004] 1. Manual observation overly relies on the naked-eye recognition ability of operators, and it can only be observed after relatively serious asymmetric shape problems occur, with low accuracy;

[0005] 2. Empirical judgment needs to rely on the production experience of operators to accurately identify the control deviation problem of the roll gap shape of strip rolling mills, and the credibility fluctuates severely;

[0006] 3. Shutdown detection is mostly applied when serious wear occurs to the components of strip rolling mills and difficult-to-adjust shape defects have appeared, and it cannot meet the immediate detection requirements. Summary of the Invention

[0007] To solve the above problems, the present invention provides a method and system for detecting and controlling the deviation of roll gap shape for a reversible rolling mill, which detect and calibrate the deviation of roll gap shape control for single-stand and multi-stand reversible rolling mills, trace the deviation according to the deviation amount, and then propose a deviation control method, specifically including:

[0008] A method for detecting and controlling the deviation of roll gap shape for a reversible rolling mill, including the following steps:

[0009] S1. Before the strip rolling mill starts production, set the detection period of roll gap shape control deviation and set the upper deviation limit value h of roll gap shape control maxand the lower deviation limit value h for setting the roll gap shape control min ;

[0010] Select k types of flatness control means for building a reversing mill, and set the total safety factor A for the regulating effect of the roll gap shape;

[0011] S2. Perform roll gap shape control deviation detection according to the detection cycle length, obtain the inlet side data and the outlet side data of the target pass, and obtain the roll gap shape control deviation function and the roll gap shape adjustment amount of the target pass;

[0012] S3. Obtain the flatness regulation effect function of the target pass according to the roll gap shape adjustment amount of the target pass;

[0013] S4. Discretize the flatness regulation effect function and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval segments;

[0014] Calculate the average value of the roll gap shape control deviation for each of the 2n interval segments;

[0015] S5. Combine the control safety factor A of the flatness regulation effect, and compare the average value of the roll gap shape control deviation for each of the 2n interval segments with the h max value and the h min value respectively to obtain a comparison result, and judge whether there is a roll gap shape control deviation in the mill to be detected according to the comparison result.

[0016] Preferably, the detection cycle length for setting the roll gap shape control deviation in S1 includes:

[0017] Set to perform a roll gap shape control deviation detection once after every s flatness regulations;

[0018] Wherein, the detection cycle length of a roll gap shape control deviation is equal to s flatness regulations.

[0019] Preferably, the performing roll gap shape control deviation detection according to the detection cycle length in S2, obtaining the inlet side data and the outlet side data of the target pass, and obtaining the roll gap shape control deviation function and the roll gap shape adjustment amount of the target pass includes:

[0020] Perform s flatness regulations;

[0021] After the s times of plate shape control are completed, the inlet side plate thickness transverse distribution function of the target pass is obtained by the inlet side thickness gauge, and the outlet side plate thickness transverse distribution function of the target pass is obtained by the outlet side thickness gauge, wherein the target pass is the selected pass to be calculated, the inlet side plate thickness transverse distribution function of the target pass is the inlet side data of the target pass, and the outlet side plate thickness transverse distribution function of the target pass is the outlet side data of the target pass;

[0022] The roll gap shape control deviation function of the target pass is obtained according to the lateral distribution function of the plate thickness at the outlet side of the target pass. The roll gap shape control deviation function g of the target pass is ex The formula for (x) is formula (1):

[0023] g ex (x) = h ex (x)-h ex-input (x) (1)

[0024] Among them, h ex (x) is the lateral distribution function of the plate thickness at the exit of the target pass, h ex-input (x) is the deviation value of the roll gap shape;

[0025] The roll gap shape adjustment amount of the target pass is obtained according to the inlet side plate thickness transverse distribution function of the target pass and the outlet side plate thickness transverse distribution function of the target pass. The roll gap shape adjustment amount g of the target pass is rgs The formula for (x) is formula (2):

[0026] g rgs (x) = h ex (x)-h en (x) (2)

[0027] Among them, h en (x) is the lateral distribution function of the plate thickness on the inlet side of the target pass.

[0028] Preferably, the step S3 of obtaining the plate shape control efficiency function of the target pass according to the roll gap shape adjustment amount of the target pass includes:

[0029] When the target pass drives only one flatness control method, the flatness control efficiency function of the target pass is formula (3):

[0030] f j (x) = g rgs (x) / (b cj +b dj ) (3)

[0031] Among them, j is the current plate shape control method, f j(x) is the flatness control efficacy function of the target pass, b cj is the operation regulation amount of the current flatness control means, b dj is the drive side regulation amount of the current flatness control means;

[0032] When two or more flatness control means are driven in the target pass, the flatness control efficacy function of each flatness control means in the target pass is calculated respectively. The calculation formula of the flatness control efficacy function of each flatness control means in the target pass is formula (4):

[0033] f j* (x) = g rgs (x) / (b cj* + b dj* ) × F (4)

[0034] Among them, f j* (x) is the flatness control efficacy function of the current flatness control means in the target pass, b cj* is the operation regulation amount of the current flatness control means in the target pass, b dj* is the drive side regulation amount of the current flatness control means in the target pass, and F is the proportion of the regulation efficacy of the current flatness control means in all the flatness control means driven in the target pass.

[0035] Preferably, in S4, the flatness control efficacy function of the target pass and the roll gap shape control deviation function of the target pass are discretized respectively, and the corresponding roll gap shape control deviation mean value is obtained according to the discretized result, including:

[0036] Take 2n discretization segments and 2n strip segments, and name the 2n discretization segments and 2n strip segments as the [-n, +n] interval;

[0037] In the [-n, +n] interval, from the [-n, -(n - 1)] interval segment to the [n - 1, n] interval segment, it is divided into 2n interval segments with a unit length of 1, and the flatness control efficacy functions of different flatness control means in the 2n interval segments are calculated, and the regulation efficacy mean values of the flatness control means in each of the 2n interval segments are obtained respectively;

[0038] According to the regulation efficacy mean values of the flatness control means in each of the 2n interval segments, the roll gap shape control deviation mean values in each of the 2n interval segments are obtained.

[0039] Preferably, in S5, combining the control safety factor A of the flatness regulation efficacy, the roll gap shape control deviation mean values in each of the 2n interval segments are respectively compared with h max value and h minCompare the numerical values to obtain a comparison result, and determine whether there is a roll gap shape control deviation in the rolling mill to be detected, including:

[0040] Set the absolute value |R| of the mean value of the strip shape control means deviation calculated currently;

[0041] When |R| ≤ h max , and, -|R| ≤ h min , there is a roll shape control deviation in the current corresponding pass, and there is no need to activate the control mechanism to support continuous production;

[0042] When |R| > h max , and, -|R| > h min , analyze the situation of the roll gap shape control deviation in the strip rolling mill, and trace the control deviation of the strip rolling mill according to the analysis result;

[0043] When |R| = A×h max +M, or, -|R| = A×h max -M, there is a roll gap shape control deviation in the current corresponding pass, and it is necessary to stop for maintenance, where M ≥ 0.

[0044] Preferably, when |R| > h max , and, -|R| > h min , analyzing the situation of the roll gap shape control deviation in the strip rolling mill, and tracing the control deviation of the strip rolling mill according to the analysis result includes:

[0045] S501. For the k strip shape control means built for the reversing mill, obtain the maximum roll gap shape control deviation section, and record the maximum roll gap shape control deviation section as the [i, i+q] interval section, and calculate the maximum regulation effect in the [i, i+q] interval section and record it as f p,[i,i+q] ;

[0046] S502. When f p,[i,i+q] < (|h max | + |h min |) / 2, increase the strip shape regulation amount of the pth item to (1 + g ex,[i,i+q)] / f p,[i,i+q] ) times the original;

[0047] f p,[i,i+q] > (h max + h min ) / 2, change the strip shape control amount difference between the [-i, -(i+q)] interval section and the [i, (i+q)] interval section, so that the strip shape control amount difference E = (g ex,[i,i+q)] / f p,[i,i+q] ) · non-deviation strip shape control amount;

[0048] S503, recollecting inlet-side data, outlet-side data, and the flatness control efficiency function of each flatness control means corresponding to the pass, and recalculating the absolute value of the mean deviation of the currently calculated flatness control means as |R|;

[0049] If |R|>h max , and -|R|>h min When S501 is repeated, it is adjusted to |R|<h max , and -|R|<h min , stopping the control mechanism.

[0050] A roll gap shape control deviation detection system for a reversing rolling mill, comprising:

[0051] The setting module is used to set the roll gap shape control deviation detection cycle and the upper deviation limit value h of the roll gap shape control before the plate and strip rolling mill is rolled. max And set the lower deviation limit value h of the roll gap shape control min ; Select k types of plate shape control methods for the reversing rolling mill and set the total safety factor A of the roll gap shape control effect;

[0052] a data acquisition module, configured to perform roll gap shape control deviation detection according to the detection cycle length, acquire inlet-side data of a target pass and outlet-side data of the target pass, and obtain a roll gap shape control deviation function of the target pass and a roll gap shape adjustment amount of the target pass;

[0053] A discrete processing module, configured to obtain a plate shape control efficiency function of the target pass according to the roll gap shape adjustment amount of the target pass;

[0054] a calculation module, configured to discretize the plate shape control efficacy function of the target pass and the roll gap shape control deviation function of the target pass to obtain 2n interval segments;

[0055] Calculate the mean value of the roll gap shape control deviation of each of the 2n intervals;

[0056] The strip mill adjustment module is used to combine the control safety factor A of the plate shape control effect, and to compare the mean value of the roll gap shape control deviation of each interval in the 2n intervals with h max Value and h min The numerical values are compared to obtain a comparison result, and it is determined based on the comparison result whether the roll gap shape control deviation occurs in the rolling mill to be inspected.

[0057] Preferably, the setting of the cycle length for the roll gap shape control deviation detection includes:

[0058] Set the roll gap shape control deviation detection to be performed every s after the plate shape is adjusted;

[0059] Among them, the cycle length of detecting a roll gap shape control deviation is equal to s times of flatness regulation and control.

[0060] Preferably, detecting the roll gap shape control deviation according to the detection cycle length, obtaining the data on the entrance side of the target pass and the data on the exit side of the target pass, and obtaining the roll gap shape control deviation function of the target pass and the roll gap shape adjustment amount of the target pass includes:

[0061] Performing s times of flatness regulation and control;

[0062] After the s times of flatness regulation and control are completed, the transverse thickness distribution function of the entrance side plate of the target pass is obtained by the thickness gauge on the entrance side, and the transverse thickness distribution function of the exit side plate of the target pass is obtained by the thickness gauge on the exit side, where the target pass is the selected pass to be calculated, the transverse thickness distribution function of the entrance side plate of the target pass is the data on the entrance side of the target pass, and the transverse thickness distribution function of the exit side plate of the target pass is the data on the exit side of the target pass;

[0063] Obtaining the roll gap shape control deviation function of the target pass according to the transverse thickness distribution function of the exit side plate of the target pass, and the roll gap shape control deviation function g ex (x) has the formula of formula (1):

[0064] g ex (x) = h ex (x) - h ex-input (x) (1)

[0065] Among them, h ex (x) is the transverse thickness distribution function of the exit side plate of the target pass, and h ex-input (x) is the deviation value of the roll gap shape;

[0066] Obtaining the roll gap shape adjustment amount of the target pass according to the transverse thickness distribution function of the entrance side plate of the target pass and the transverse thickness distribution function of the exit side plate of the target pass, and the roll gap shape adjustment amount g rgs (x) has the formula of formula (2):

[0067] g [[ID=NO=40]] rgs (x) = h ex (x) - h en (x) (2)

[0068] Among them, h en (x) is the transverse thickness distribution function of the entrance side plate of the target pass.

[0069] The above technical solution has at least the following beneficial effects compared with the prior art:

[0070] The above scheme and method can realize online detection and online control of roll gap shape control deviation in single rolling production and reciprocating rolling production of reversible rolling mills, and can intuitively reflect the influence law of roll gap shape control effect caused by the spatial position of the operating side and transmission side of the rolling mill on various plate shape control measures, and quickly and instantly give roll gap shape deviation control strategy, realize online detection and adjustment of plate and strip rolling mill faults, and provide guarantee for continuous and stable production scheduling of plate and strip rolling mills. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0072] Figure 1 A flow chart of a roll gap shape control deviation detection method for a reversing rolling mill provided in an embodiment of the present application;

[0073] Figure 2 A layout diagram of a reversible rolling mill device provided in an embodiment of the present application;

[0074] Figure 3 Schematic diagram of the roller system and strip segments provided in the embodiment of the present application;

[0075] Figure 4 A schematic structural diagram of a roll gap shape control deviation detection system for a reversing rolling mill provided in an embodiment of the present application;

[0076] Figure 5 It is a structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0077] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0078] Regardless of the type of rolling mill, the shape of the roll gap of the rolling mill is the fundamental factor affecting the cross-sectional shape of the strip at the rolling exit. Existing flatness control means can evaluate the changes in cross-sectional parameter indicators such as plate crown and edge drop values through the changes in flatness and plate thickness of the side plates at the exit, and then drive devices such as work roll bending, roll shifting, and roll crossing to adjust the shape of the roll gap. However, traditional detection and control means are difficult to identify the control deviations caused by the wear or misalignment of the rolling mill itself, and it is even more difficult to adjust and control with the original roll gap shape control strategy. To address such problems, the present invention proposes a method and system for detecting and controlling the control deviation of the roll gap shape for a reversible rolling mill, which can detect and calibrate the control deviation of the roll gap shape of single-stand and multi-stand reversible rolling mills, trace the deviation source according to the deviation amount, and then propose a deviation control method, effectively improving the roll gap control ability of the rolling mill.

[0079] As Figure 2 and Figure 3 shown, the regulation components of the present application include: left thickness gauge 1, left flatness gauge 2, left coiling roll 3, lower work roll 4, lower backup roll 5, upper backup roll 6, upper work roll 7, right thickness gauge 8, right flatness gauge 9, and right coiling roll 10.

[0080] The layout of the reversible rolling mill device adopts a left-right symmetric structure. Figure 2 As shown in the figure, it is a single-stand reversible rolling mill, and a left thickness gauge 1, a left flatness gauge 2, a left coiling roll 3, a right thickness gauge 8, a right flatness gauge 9, and a right coiling roll 10 are respectively arranged on both the left and right sides. The rolling mill main body is jointly composed of a lower work roll 4, a lower backup roll 5, an upper backup roll 6, and an upper work roll 7. The reversible rolling mill detection device is jointly composed of a left thickness gauge 1, a left flatness gauge 2, a right thickness gauge 8, and a right flatness gauge 9. The uncoiling and coiling of the reversible rolling mill are jointly executed by the left coiling roll 3 and the right coiling roll 10 according to the rolling direction. The said detection devices can all feedback the production line information to the roll gap shape control deviation calculation system in real time during the rolling production process of the reversible rolling mill. Among them, the left thickness gauge 1 is arranged between the left flatness gauge 2 and the rolling mill main body, and the right thickness gauge 8 is arranged between the right flatness gauge 9 and the rolling mill main body. The thickness gauges and flatness gauges on both sides need to transmit signals in sequence according to the spatial position order.

[0081] If the rolling direction is from left to right, the roll gap shape control deviation calculation system sequentially collects the initial flatness of the strip at the left entrance, the initial thickness of the strip at the left entrance, the exit thickness of the strip at the right entrance, and the exit flatness of the strip at the right entrance to reduce the interference of the coiling on the thickness values of each segment of the strip required for system calculation. If the rolling direction is from right to left, the roll gap shape control deviation calculation system sequentially collects the initial flatness of the strip at the right entrance, the initial thickness of the strip at the right entrance, the exit thickness of the strip at the left entrance, and the exit flatness of the strip at the left entrance.

[0082] The left thickness gauge 1, left shape meter 2, right thickness gauge 8, and right shape meter 9 all adopt a segmented detection form. The strip is axially equally spaced into 2n segments, and the segment interval from the operator side to the drive side is [-n, +n]. The 0th segment is located at the center of the strip; the detection areas of the left thickness gauge 1, left shape meter 2, right thickness gauge 8, and right shape meter 9 are also divided into 2m segments, and the segment interval from the operator side to the drive side is [-m, +m]. The 0th segment is located at the center of each detection device. Among them, the segment length of the 2n segments of the strip is equal to the segment length of the 2m segments of the detection area, and the value of the number of segments 2m is greater than the value of the number of segments 2n to ensure that strip information with different strip widths can be accurately collected. For the i-th segment detection area of the strip (-n ≤ i ≤ +n) and the j-th segment detection area of the detection device (-m ≤ j ≤ +m), if the value of i is equal to the value of j, then at this time, the strip detection area and the detection area of each detection device are in the same control interval.

[0083] The lower work roll 4, lower backup roll 5, upper backup roll 6, and upper work roll 7 included in the mill body can be equipped with shape control devices such as roll bending, roll shifting, and roll crossing, and the shape control amount can be adjusted in the external secondary control system, thereby adjusting the roll gap shape. The external secondary control system can regard the interface between the operator side and the drive side as a symmetry plane, symmetrically adjust the shape control amounts on the operator side and the drive side, and then change the roll gap to a flat shape.

[0084] The shape control amounts such as roll bending, roll shifting, and roll crossing can be transmitted by the secondary control system to the roll gap shape control deviation calculation system for solving the roll gap shape control deviation amount. The roll gap shape control deviation calculation system can be started since the strip rolling begins, and the time interval for its sampling, calculation, and other operations can be selected to be calculated once after each shape regulation per s times.

[0085] As Figure 1 shown, based on the above-mentioned regulation components, the present application provides a method for detecting and controlling the roll gap shape control deviation for a reversing mill, including the following steps:

[0086] S1. Before the strip mill rolls and produces, set the roll gap shape control deviation detection period, set the upper deviation limit value h max of the roll gap shape control, and set the lower

[0087] deviation limit value h min ;

[0088] Select k types of shape control means for the reversing mill to build, and set the total safety factor A of the roll gap shape regulation efficacy.

[0089] Among them, preferably, the cycle length of setting the roll gap shape control deviation detection in S1 includes:

[0090] Set to perform a roll gap shape control deviation detection once every s times of flatness control; the cycle length of a roll gap shape control deviation detection is equal to s times of flatness control.

[0091] Specifically, in one implementation, S1. Before performing rolling, set the roll gap shape control deviation detection cycle (perform a roll gap shape control deviation detection once every s times of flatness control), and set the upper and lower deviation limits h of the roll gap shape control. max And h min ; Select that the reversible rolling mill is equipped with k flatness control means in total, and set the total safety factor A of the roll gap shape control efficacy.

[0092] Among them, the roll gap shape control deviation detection is to detect the deviation value between the actual roll gap shape and the ideal roll gap shape. Specifically, after s times of flatness control, use the thickness gauge on the exit side of the rolling mill to obtain the transverse (width direction) distribution function h ex (x) of the strip thickness at the exit, and subtract the measured data h ex (x) from the ideal data h ex-input (x) one by one, and then obtain the roll gap shape control deviation value function g ex (x).

[0093] Among them, the k flatness control means carried by the reversible rolling mill in S1 include:

[0094] Set the non-deviation flatness control efficacy function f 1,板形控制量 (x) of the first flatness control means;

[0095] Set the non-deviation flatness control efficacy function f 2,板形控制量 (x) of the second flatness control means;

[0096] Until the non-deviation flatness control efficacy function f k,板形控制量 (x) of the kth flatness control means is set;

[0097] Among them, k takes a positive integer.

[0098] S2. Perform roll gap shape control deviation detection according to the detection cycle length, obtain the inlet side data of the target pass and the outlet side data of the target pass, and obtain the roll gap shape control deviation function of the target pass and the roll gap shape adjustment amount of the target pass.

[0099] Specifically include:

[0100] Perform s times of flatness control;

[0101] After the s - time flatness regulation ends, the transverse distribution function of the entrance side plate thickness of the target pass is obtained by the thickness gauge on the entrance side, and the transverse distribution function of the exit side plate thickness of the target pass is obtained by the thickness gauge on the exit side. Among them, the target pass is the selected pass to be calculated. The transverse distribution function of the entrance side plate thickness of the target pass is the entrance - side data of the target pass, and the transverse distribution function of the exit side plate thickness of the target pass is the exit - side data of the target pass;

[0102] According to the transverse distribution function of the exit side plate thickness of the target pass, the roll gap shape control deviation function of the target pass is obtained. The formula of the roll gap shape control deviation function g ex (x) is formula (1):

[0103] g ex (x)=h ex (x)-h ex-input (x)(1)

[0104] Among them, h ex (x) is the transverse distribution function of the exit side plate thickness of the target pass, and h ex-input (x) is the deviation value of the roll gap shape;

[0105] According to the transverse distribution function of the entrance side plate thickness of the target pass and the transverse distribution function of the exit side plate thickness of the target pass, the roll gap shape adjustment amount of the target pass is obtained. The formula of the roll gap shape adjustment amount g rgs (x) is formula (2):

[0106] g rgs (x)=h ex (x)-h en (x)(2)

[0107] Among them, h en (x) is the transverse distribution function of the entrance side plate thickness of the target pass.

[0108] Specifically, one implementation manner is that step S2 includes:

[0109] After experiencing s - time flatness regulation, the transverse distribution functions of the entrance side plate thickness h en (x) and h ex (x) are respectively obtained by the thickness gauge on the entrance side and the thickness gauge on the exit side, and the roll gap shape control deviation function g ex (x)=h ex (x)-h ex-input (x) of this pass and the roll gap shape adjustment amount g rgs (x)=h ex (x)-h en(x); Meanwhile, obtain the operation regulation amounts [b c1 , b c2 , …, b ck of the k flatness control means in this pass and the regulation amounts [b d1 , b d2 , …, b dk on the drive side.

[0110] S3. According to the roll gap shape adjustment amount of the target pass, obtain the flatness regulation efficacy function of the target pass, specifically including:

[0111] When only one flatness control means is driven in the target pass, the flatness regulation efficacy function of the target pass is formula (3):

[0112] f j (x) = g rgs (x) / (b cj + b dj ) (3)

[0113] Where j is the current flatness control means, f j (x) is the flatness regulation efficacy function of the target pass, b cj is the operation regulation amount of the current flatness control means, and b dj is the regulation amount on the drive side of the current flatness control means;

[0114] When two or more flatness control means are driven in the target pass, calculate the flatness regulation efficacy functions of each flatness control means of the target pass respectively. The calculation formula of the flatness regulation efficacy function of each flatness control means of the target pass is formula (4):

[0115] f j* (x) = g rgs (x) / (b cj* + b dj* ) × F (4)

[0116] Where f j* (x) is the flatness regulation efficacy function of the current flatness control means of the target pass, b cj* is the operation regulation amount of the current flatness control means of the target pass, b dj* is the regulation amount on the drive side of the current flatness control means of the target pass, and F is the regulation efficacy proportion of the current flatness control means in all the flatness control means driven in the target pass.

[0117] Specifically, one implementation manner, step S3 specifically includes:

[0118] According to the roll gap shape adjustment amount g rgs(x), obtain the flatness regulation function of the flatness control means for this pass;

[0119] If only one flatness control means j is actuated in this pass, its regulation function can be expressed as f j (x) = g rgs (x) / (b cj + b dj );

[0120] If two flatness control means are actuated in this pass, for example, flatness control means j and flatness control means h, then its regulation function is expressed as f j (x) = s · g rgs (x) / (b cj + b dj ), f h (x) = (1 - s) · g rgs (x) / (b ch + b dh ), where s is the proportion of the regulation effect of flatness control means j in this pass.

[0121] S4. Discretize the flatness regulation function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval segments; calculate the mean value of the roll gap shape control deviation for each interval segment among the 2n interval segments, specifically including:

[0122] The step S4 of discretizing the flatness regulation function of the target pass and the roll gap shape control deviation function of the target pass respectively, and obtaining the corresponding mean value of the roll gap shape control deviation according to the discretized result includes:

[0123] Take 2n discretized segmentation numbers and 2n strip segmentation numbers, and name the 2n discretized segmentation numbers and 2n strip segmentation numbers as the [-n, +n] interval;

[0124] In the [-n, +n] interval, from the [-n, -(n - 1)] interval segment to the [n - 1, n] interval segment, divide it into 2n interval segments with a unit length of 1, calculate the flatness regulation function of different flatness control means in the 2n interval segments, and respectively obtain the mean value of the regulation effect of the flatness control means for each interval segment among the 2n interval segments;

[0125] Obtain the mean value of the roll gap shape control deviation for each interval segment among the 2n interval segments according to the mean value of the regulation effect of the flatness control means for each interval segment among the 2n interval segments.

[0126] A specific implementation manner, step S4 includes:

[0127] For the roll gap shape control deviation function g ex(x) and the regulation efficacy function f of each flatness control means in this pass j Perform discretization processing on (x). Among them, the number of discretization segments is the same as the number of strip segments, both taking 2n segments, and naming them as the [-n, +n] interval;

[0128] Starting from the [-n, -(n - 1)] interval segment and within the [-n, +n] interval, successively calculate the regulation efficacy functions f1(x), f2(x), …, f k (x) of different flatness control means within 2n interval segments, and obtain the average regulation efficacy f of each flatness control means within 2n interval segments 1,[-n,-(n-1)] 、…、f 1,[n-1,n] 、f 2,[-n,-(n-1)] 、…、f 2,[n-1,n] 、…、f k,[-n,-(n-1)] 、…、f k,[n-1,n] ;

[0129] Starting from the [-n, -(n - 1)] interval segment and within the [-n, +n] interval, successively calculate the average roll gap shape control deviation g of 2n sections ex,[-n,-(n-1)] 、…、g ex,[n-1,n] .

[0130] S5. Combine the control safety factor A of the flatness regulation efficacy, and compare the average roll gap shape control deviation of each of the 2n interval segments with the h max value and the h min value to obtain a comparison result, and judge whether there is a roll gap shape control deviation in the mill to be detected according to the comparison result.

[0131] A specific implementation manner. The S5 step specifically includes:

[0132] Combine the total safety factor A of the roll gap shape regulation efficacy, and compare the average roll gap shape control deviation g of the 2n sections ex,[-n,-(n-1)] 、…、g ex,[n-1,n] with the set h max and h min for comparison, and judge whether there is a roll gap shape control deviation in the mill to be detected according to the comparison result. Among them, set the absolute value |R| of the average deviation amount of the current flatness control means as formula (5);

[0133]

[0134] When |R| ≤ h max , and, -|R| ≤ h min , there is a roll shape control deviation in the current corresponding pass, and there is no need to turn on the control mechanism, and continuous production is supported;

[0135] When |R| > h max , and, -|R| > hmin When there is a deviation in the roll gap shape control of the strip mill, trace the source of the control deviation of the strip mill according to the analysis result.

[0136] When |R| = A×h max +M, or, -|R| = A×h max -M, there is a deviation in the roll gap shape control in the current corresponding pass, and it is necessary to stop the machine for maintenance, where M≥0.

[0137] Among them, when |R| > h max , and, -|R| > h min When, analyze the situation of the deviation in the roll gap shape control of the strip mill, and tracing the source of the control deviation of the strip mill according to the analysis result includes:

[0138] S501. For the k types of flatness control means built for the reversing mill, obtain the section with the largest roll gap shape control deviation, and record the section with the largest roll gap shape control deviation as the [i, i+q] interval section, and calculate the maximum regulation effect within the [i, i+q] interval section as f p,[i,i+q] ;

[0139] S502. When f p,[i,i+q] < (|h max | + |h min |) / 2, increase the p-th flatness regulation amount to (1 + g ex,[i,i+q)] / f p,[i,i+q] ) times the original;

[0140] f p,[i,i+q] > (h max + h min ) / 2, change the difference in flatness control amount between the [-i, -(i+q)] interval section and the [i, (i+q)] interval section, so that the flatness control amount difference E = (g ex,[i,i+q)] / f p,[i,i+q] ) · flatness control amount without deviation;

[0141] S503. Re-collect the data on the inlet side, the data on the outlet side, and the flatness regulation effect function corresponding to each pass of each flatness control means, and re-calculate the absolute value of the mean of the flatness control means deviation amount currently calculated as |R|;

[0142] If |R| > h max , and, -|R| > h min When, repeat S501 until it is adjusted to |R| < h max , and, -|R| < h min , stop the control mechanism.

[0143] A specific implementation method of this method in production is as follows:

[0144] Before rolling production, set the detection cycle length for the roll gap shape control deviation calculation system, and set to calculate the roll gap shape control deviation once after each s times of shape control adjustment; set 3 shape control means carried by the reversing mill, and include the deviation-free shape control adjustment efficacy function f 1,板形控制量 (x) of the first shape control means, the deviation-free shape control adjustment efficacy function f 2,板形控制量 (x) of the second shape control means, and the deviation-free shape control adjustment efficacy function f 3,板形控制量 (x) of the third shape control means; set the upper limit value h max = +10μm and the lower limit value h min = -10μm of the shape control adjustment efficacy, and set the control safety factor A = 3 of the shape control adjustment efficacy.

[0145] The strip mill produces and undergoes 10 times of shape control adjustments, and obtain the data on the entrance side and the exit side; obtain the shape control adjustment efficacy functions of each pass of each shape control means.

[0146] Discretize the shape control adjustment efficacy function. The number of discretization segments is the same as the number of strip segments, both taking 20 segments, and name them with the interval [-10, +10].

[0147] Starting from the [-10, -9] section, calculate the deviation amounts h 1,板形控制量 (x), h 2,板形控制量 (x), h 3,板形控制量 (x) of the shape control adjustment efficacy function of this pass and the deviation-free pass in turn. The calculation method is h k,板形控制量 (x) = g k,板形控制量 (x) - f k,板形控制量 (x); calculate the average deviation amount h 1,板形控制量,[-10,-9] = 11μm, h 2,板形控制量,[-10,-9] = 3μm, h k,板形控制量,[-10,-9] = 7μm of each shape control means in this section.

[0148] If the average deviation amount of the shape control means 1 is greater than h max = +10μm, then at this time, the rolling mill has an obvious roll gap shape control deviation, and it is necessary to activate the control mechanism and perform a callback.

[0149] Compare the average deviation amounts of each shape control means in each section, and extract the shape control means 1 with the maximum control deviation of the shape control adjustment efficacy and the occurrence position [6, 7].

[0150] Let f 1,板形控制量 (x) = h 1,板形控制量,[6,7] - h 1,板形控制量,[-7,-6] = 11.5μm, f p,板形控制量If (x)>10μm, the roll gap shape control deviation of this flatness control means is caused by the spatial position difference between the operator side and the drive side of the roll equipped with this flatness control means. For the callback of this flatness control means, it is necessary to change the difference in flatness control amount between the [6,7] section side and the [-7,-6] section side. Since the flatness control means is hydraulic roll bending, after calculation, the value of the difference is 36kN.

[0151] After adjusting the flatness control amount, collect the data on the entry side, the data on the exit side, and the flatness control efficacy function of each flatness control means after adjustment for the pass again, and execute Steps 4 and 5. If no maximum deviation value appears, stop the control mechanism.

[0152] This method can realize the on-line detection and on-line control of the roll gap shape control deviation in the single-pass rolling production and the reciprocating rolling production of a reversible rolling mill, can intuitively reflect the influence law of the roll gap shape control effect of each flatness control means caused by the spatial position of the operator side and the drive side of the rolling mill, and can quickly and immediately give the roll gap shape deviation regulation strategy to realize the on-line detection and adjustment of the faults of the strip rolling mill, providing guarantee for the continuous and stable production scheduling of the strip rolling mill.

[0153] As Figure 4 shown, a roll gap shape control deviation detection and control system for a reversible rolling mill includes:

[0154] A setting module 100, configured to set a roll gap shape control deviation detection period, set an upper deviation limit value h max for roll gap shape control and set a lower deviation limit value h min for roll gap shape control before the rolling production of the strip rolling mill; select k flatness control means built in the reversible rolling mill and set the total safety factor A of the roll gap shape regulation efficacy;

[0155] A data acquisition module 200, configured to detect the roll gap shape control deviation according to the length of the detection period, acquire the data on the entry side of the target pass and the data on the exit side of the target pass, and obtain the roll gap shape control deviation function of the target pass and the roll gap shape adjustment amount of the target pass;

[0156] A discrete processing module 300, configured to obtain the flatness control efficacy function of the target pass according to the roll gap shape adjustment amount of the target pass;

[0157] A calculation module 400, configured to perform discrete processing on the flatness control efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval segments;

[0158] Calculate the mean value of the roll gap shape control deviation of each interval segment in the 2n interval segments;

[0159] The strip mill adjustment module 500 is used to combine the control safety factor A of the plate shape control effect, and respectively compare the mean value of the roll gap shape control deviation in each of the 2n intervals with the h max value and the h min value to obtain a comparison result, and determine whether there is a roll gap shape control deviation in the mill to be detected according to the comparison result.

[0160] Preferably, the set cycle length for detecting the roll gap shape control deviation includes:

[0161] Set to perform a roll gap shape control deviation detection once after every s times of plate shape regulation;

[0162] Among them, the cycle length of a roll gap shape control deviation detection is equal to s times of plate shape regulation.

[0163] Preferably, the roll gap shape control deviation is detected according to the detection cycle length, the inlet side data of the target pass and the outlet side data of the target pass are obtained, and the roll gap shape control deviation function of the target pass and the roll gap shape adjustment amount of the target pass include:

[0164] Perform s times of plate shape regulation;

[0165] After the s times of plate shape regulation are completed, the transverse distribution function of the inlet side plate thickness of the target pass is obtained through the inlet side thickness gauge, and the transverse distribution function of the outlet side plate thickness of the target pass is obtained through the outlet side thickness gauge. Among them, the target pass is the selected pass to be calculated, the transverse distribution function of the inlet side plate thickness of the target pass is the inlet side data of the target pass, and the transverse distribution function of the outlet side plate thickness of the target pass is the outlet side data of the target pass;

[0166] According to the transverse distribution function of the outlet side plate thickness of the target pass, the roll gap shape control deviation function of the target pass is obtained. The formula of the roll gap shape control deviation function g ex of (x) is formula (1):

[0167] g ex (x) = h ex (x) - h ex-input (x) (1)

[0168] Among them, h ex (x) is the transverse distribution function of the outlet side plate thickness of the target pass, and h ex-input (x) is the deviation value of the roll gap shape;

[0169] According to the transverse distribution function of the inlet side plate thickness of the target pass and the transverse distribution function of the outlet side plate thickness of the target pass, the roll gap shape adjustment amount of the target pass is obtained. The roll gap shape adjustment amount g of the target passrgs The formula for (x) is Formula (2):

[0170] g rgs (x) = h ex (x) - h en (x) (2)

[0171] where h en (x) is the lateral distribution function of the entrance side plate thickness of the target pass.

[0172] This system can realize on-line detection and on-line control of the roll gap shape control deviation in the single-direction rolling production and reciprocating rolling production of a reversible rolling mill, can intuitively reflect the influence law of the roll gap shape control effect caused by the spatial positions of the operating side and the driving side of the rolling mill on various flatness control means, and can quickly and immediately give the regulation strategy for the roll gap shape deviation, realizing on-line detection, reporting and adjustment of the faults of the strip rolling mill, and providing guarantee for the continuous and stable production scheduling of the strip rolling mill.

[0173] Figure 5 is a schematic structural diagram of an electronic device 700 provided by an embodiment of the present invention. The electronic device 600 may vary greatly due to different configurations or performances, and may include one or more processors (central processing units, CPUs) 710 and one or more memories 720. Among them, at least one instruction is stored in the memory 720, and at least one instruction is loaded and executed by the processor 710 to implement the steps of the above-mentioned method for detecting and controlling the roll gap shape control deviation of a reversible rolling mill.

[0174] In an exemplary embodiment, a computer-readable storage medium is further provided, such as a memory including instructions, and the above instructions can be executed by a processor in a terminal to complete the above-mentioned method for detecting and controlling the roll gap shape control deviation of a reversible rolling mill. For example, the computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0175] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the technical solutions of the present invention.

Claims

1. A method for detecting and controlling the deviation of roll gap shape for a reversible rolling mill, characterized in that, It includes the following steps: S1. Before the rolling production of the strip mill, set the detection period of the roll gap shape control deviation, set the upper deviation limit value of the roll gap shape control h max and set the lower deviation limit value of the roll gap shape control h min ; Select k types of shape control methods for the reversible rolling mill and set the total safety factor of the roll gap shape control effect A ; S2. Perform roll gap shape control deviation detection according to the detection cycle length, obtain the inlet side data of the target pass and the outlet side data of the target pass, and obtain the roll gap shape control deviation function and the roll gap shape adjustment amount of the target pass, including: Perform s times of shape control regulation; After the s times of shape control regulation are completed, obtain the transverse thickness distribution function of the inlet side plate of the target pass through the inlet side thickness gauge, and obtain the transverse thickness distribution function of the outlet side plate of the target pass through the outlet side thickness gauge, where the target pass is the selected pass to be calculated, the transverse thickness distribution function of the inlet side plate of the target pass is the inlet side data of the target pass, and the transverse thickness distribution function of the outlet side plate of the target pass is the outlet side data of the target pass; Obtain the roll gap shape control deviation function of the target pass according to the lateral distribution function of the exit side plate thickness of the target pass, and the roll gap shape control deviation function of the target pass g ex (x) is given by formula (1): g ex (x)= h ex (x)- h ex-input (x)(1) h ex (x) is the transverse distribution function of the exit side plate thickness of the target pass, h ex-input (x) is the deviation value of the roll gap shape; Obtain the roll gap shape adjustment amount of the target pass according to the entrance side plate thickness transverse distribution function of the target pass and the exit side plate thickness transverse distribution function of the target pass. The roll gap shape adjustment amount of the target pass g rgs (x) is given by formula (2): g rgs (x)= h ex (x)- h en (x) (2) h en (x) is the transverse distribution function of the entrance side plate thickness of the target pass; S3. Obtain the shape control efficacy function of the target pass according to the roll gap shape adjustment amount of the target pass; S4. Discretize the shape control efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval segments; Calculate the average value of the roll gap shape control deviation of each interval segment in the 2n interval segments; S5. Control safety factor combined with plate shape control efficacy A , respectively compare the mean value of the roll gap shape control deviation in each of the 2n interval segments with h max the numerical value and h min the numerical value to obtain a comparison result, and judge whether there is a roll gap shape control deviation in the mill to be detected according to the comparison result.

2. The method for detecting and controlling the deviation of the roll gap shape for a reversible rolling mill according to claim 1, characterized in that, The set detection cycle length of the roll gap shape control deviation in S1 includes: Set to perform roll gap shape control deviation detection once after every s times of shape control regulation; Wherein, the detection cycle length of a roll gap shape control deviation is equal to s times of shape control regulation.

3. A method for detecting and controlling the deviation of the roll gap shape for a reversible rolling mill according to claim 1, characterized in that, The obtaining the shape control efficacy function of the target pass according to the roll gap shape adjustment amount of the target pass in S3 includes: [[ID=ll]]When only one shape control means is driven for the target pass, the shape control efficacy function of the target pass is formula (3): f j (x) = g rgs (x) / ( b cj + b dj ) (3) where j is the current shape control means, f j (x) is the shape regulation and control efficacy function of the target pass, b cj is the operation regulation amount of the current shape control means, b dj is the drive side regulation amount of the current shape control means; When two or more shape control means are driven for the target pass, calculate the shape control efficacy function of each shape control means of the target pass respectively, and the calculation formula of the shape control efficacy function of each shape control means of the target pass is formula (4): f j (x)=g rgs (x) / ( b cj + b dj )×F(4) Among them, f j (x) is the flatness regulation and control efficacy function of the current flatness control means for the target pass, b cj is the operation regulation and control amount of the current flatness control means for the target pass, b dj is the drive side regulation and control amount of the current flatness control means for the target pass, and F is the proportion of the regulation and control efficacy of all the flatness control means driven by the current flatness control means in the target pass.

4. A method for detecting and controlling the deviation of roll gap shape for a reversible rolling mill according to claim 1, characterized in that, The discretizing the shape control efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively in S4, and obtaining the corresponding average value of the roll gap shape control deviation according to the discretized result includes: Take 2n discretized segmentation numbers and 2n strip segmentation numbers, and name the 2n discretized segmentation numbers and 2n strip segmentation numbers as the [-n, +n] interval; In the [-n, +n] interval, from the [-n, -(n - 1)] interval segment to the [n - 1, n] interval segment, divide it into 2n interval segments with a unit length of 1, calculate the shape control efficacy function of different shape control means in the 2n interval segments, and respectively obtain the average value of the shape control means regulation efficacy of each interval segment in the 2n interval segments; Obtain the average value of the roll gap shape control deviation of each interval segment in the 2n interval segments according to the average value of the shape control means regulation efficacy of each interval segment in the 2n interval segments.

5. A method for detecting and controlling the deviation of the roll gap shape for a reversible rolling mill according to claim 1, characterized in that, The control safety factor for the combined plate shape control effect of S5 A , the mean value of the roll gap shape control deviation in each of the 2n intervals is respectively compared with h max the numerical value and h min the numerical value to obtain a comparison result, and judging whether there is a roll gap shape control deviation in the mill to be detected according to the comparison result includes: Set the absolute value |R| of the average value of the shape control means deviation amount currently calculated; When |R| ≤ h max , and -|R| ≤ h min , a roll shape control deviation occurs in the current corresponding secondary path, and there is no need to activate the control mechanism, supporting continuous production; When |R| > h max , and -|R| > h min , analyze the situation of the roll gap shape control deviation occurring in the strip rolling mill, and trace the control deviation of the strip rolling mill according to the analysis result; When |R| = A × h max + M, or, -|R| = A × h max - M, there is a roll gap shape control deviation in the current corresponding secondary pass, and shutdown maintenance is required. Among them, M ≥ 0.

6. The method for detecting and controlling the deviation of the roll gap shape for a reversible rolling mill according to claim 3, characterized in that, When |R| > h max , and -|R| > h min , analyze the situation of the control deviation of the roll gap shape of the strip rolling mill, and trace the control deviation of the strip rolling mill according to the analysis results, including: S501. For the k types of flatness control means established for the reversible rolling mill, obtain the section with the maximum roll gap shape control deviation, and denote the section with the maximum roll gap shape control deviation as i , i + q interval section, and calculate i , i + q The maximum regulation effect within the interval section is denoted as f p,[i,i+q] ; S502. When f p,[i,i+q] <(| h max | + | h min |) / 2, increase the top plate shape control amount to (1 p times the original; + g ex,[i, i+q)] / f p,[i,i+q] ) times; f p,[i,i+q] >( h max + h min ) / 2, change the difference in flatness control amount in the interval [- i , -( i + q )] and i , ([[]] i + q )] interval, so that the flatness control amount difference E = ( g ex,[i, i+q)] / f p,[i,i+q] ) · flatness control amount without deviation; S503. Re - collect the data on the entrance side, the data on the exit side, and the shape control efficacy function of each shape control means corresponding to the passes, and recalculate the absolute value of the mean of the current calculated shape control means deviation amount as |R|; If |R| > h max , and, -|R| > h min , repeat the execution of S501 until it is adjusted to |R| < h max , and, -|R| < h min , stop the control mechanism.

7. A roll gap shape control deviation detection and control system for a reversible rolling mill, characterized in that, Including: A setting module, which is used to set the detection period of the roll gap shape control deviation and set the upper deviation limit value h of the roll gap shape control before the rolling production of the strip mill max and set the lower deviation limit value h of the roll gap shape control min ; select k types of shape control means built by the reversing mill and set the total safety factor A of the roll gap shape regulation effect; A data acquisition module, configured to perform roll gap shape control deviation detection according to the detection cycle length, acquire the data on the entrance side of the target pass and the data on the exit side of the target pass, and obtain the roll gap shape control deviation function of the target pass and the roll gap shape adjustment amount of the target pass. Including: Among them, perform s times of shape control; After the s times of shape control are completed, obtain the transverse thickness distribution function of the entrance side plate of the target pass through the entrance - side thickness gauge, and obtain the transverse thickness distribution function of the exit side plate of the target pass through the exit - side thickness gauge. Among them, the target pass is the selected pass to be calculated, the transverse thickness distribution function of the entrance side plate of the target pass is the data on the entrance side of the target pass, and the transverse thickness distribution function of the exit side plate of the target pass is the data on the exit side of the target pass; Obtain the roll gap shape control deviation function of the target pass according to the lateral distribution function of the exit side plate thickness of the target pass, and the roll gap shape control deviation function of the target pass g ex (x) is given by formula (1): g ex (x)= h ex (x)- h ex-input (x)(1) Among them, h ex (x) is the lateral distribution function of the exit side plate thickness of the target pass, h ex-input (x) is the deviation value of the roll gap shape; The roll gap shape adjustment amount of the target pass is obtained based on the entrance side plate thickness transverse distribution function of the target pass and the exit side plate thickness transverse distribution function of the target pass. The roll gap shape adjustment amount of the target pass g rgs (x) is expressed by Formula (2): g rgs (x)= h ex (x)- h en (x)(2) Among them, h en (x) is the transverse distribution function of the entrance side plate thickness of the target pass. A discrete processing module, configured to obtain the shape control efficacy function of the target pass according to the roll gap shape adjustment amount of the target pass; A calculation module, configured to perform discretization processing on the shape control efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively, to obtain 2n interval segments; Calculate the mean of the roll gap shape control deviation of each of the 2n interval segments; The strip mill adjustment module is used to combine the control safety factor A of the plate shape control effect, and respectively compare the mean value of the roll gap shape control deviation of each of the 2n interval segments with the h max value and the h min value to obtain a comparison result, and determine whether there is a roll gap shape control deviation in the mill to be detected according to the comparison result.

8. The roll gap shape control deviation detection and control system for a reversible rolling mill according to claim 7, characterized in that, The set cycle length of the roll gap shape control deviation detection includes: Set to perform roll gap shape control deviation detection once after every s times of shape control; Among them, the cycle length of one roll gap shape control deviation detection is equal to s times of shape control.

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