CN116550769A - Roll gap shape control deviation detection and control method and system for reversible rolling mill - Google Patents
Roll gap shape control deviation detection and control method and system for reversible rolling mill Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 126
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- 230000002441 reversible effect Effects 0.000 title claims abstract description 45
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- 238000007689 inspection Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 7
- 238000002788 crimping Methods 0.000 description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention provides a roll gap shape control deviation detection and control method for a reversible rolling mill, which comprises the following steps: before rolling production of a plate and strip mill, acquiring inlet side data and outlet side data by setting related data, and simultaneously acquiring plate shape regulation and control efficacy functions of corresponding passes of each plate shape control means; discretizing the plate shape regulating function to obtain 2n segments with the number equal to that of the plate band segments, and the number of the discretized segments is [ -n, +n]A section; from [ -n, - (n-1)]The interval is from [ -n, +n]In the interval, sequentially calculating the deviation value of the corresponding pass and the non-deviation pass of each plate shape regulation efficacy function of each interval section to obtain the deviation value average value of each plate shape control means of each interval section, wherein the length of each interval section is 1; combining the control safety coefficient A of the plate shape regulating and controlling effect, and setting the deviation value average value of each plate shape control means of each interval section to h max H min Comparing to obtain a comparisonAs a result, the strip mill is adjusted according to the comparison result.
Description
Technical Field
The invention relates to the field of strip rolling mills, in particular to a roll gap shape control deviation detection and control method and system for a reversible rolling mill.
Background
In the case of strip rolling, the control of the roll gap shape is particularly important. The roll gap shapes of the plate and strip rolling mill are respectively adjusted by the rolling mill roll system control modes of hydraulic roll bending, axial roll shifting and roll crossing of the HC series rolling mill, the UCM series rolling mill, the PC series rolling mill and the like. The technology is widely applied to modern rolling mills, achieves good roll gap shape control effect, and can provide guarantee for production of flat plate strips. At present, the core of the roll gap shape control of the plate and strip rolling mill is the symmetrical adjustment or the proportional adjustment of the adjustment and control quantity at the two sides of the operation side and the transmission side. However, in actual production, the critical components such as the lining plate of the rolling mill, the rolling mill roller, the roller bearing and the like inevitably wear, and the wear is not planar uniform. Thereby, wear of the rolling mill components further induces a control deviation of the roll gap shape, such that the original roll gap shape control strategy is no longer applicable.
At present, a method of manual observation and experience judgment is mostly adopted for the problems, and the measurement of the space precision of the roller system also needs to refer to shutdown detection data. It can be seen that the existing method has the following problems:
1. The manual observation is excessively dependent on the visual recognition capability of operators, and the rear part of the asymmetric plate shape problem which is serious needs to be observed, so that the accuracy is low;
2. the experience judgment is required to depend on the production experience of operators, and the problem of control deviation of the roll gap shape of the strip mill can be accurately identified, so that the reliability fluctuation is serious;
3. the shutdown detection is often applied to the moment when the strip mill element is severely worn and the strip defect which is difficult to adjust is generated, and the instant detection requirement cannot be met.
Disclosure of Invention
In order to solve the problems, the invention provides a roll gap shape control deviation detection and control method and a system for a reversible rolling mill, which are used for detecting and calibrating roll gap shape control deviation of a single-frame and multi-frame reversible rolling mill, tracing the deviation according to the deviation amount, and further providing a deviation control method, which specifically comprises the following steps:
a roll gap shape control deviation detection and control method for a reversible rolling mill comprises the following steps:
s1, before rolling production of a plate and strip rolling mill, setting a roll gap shape control deviation detection period and setting an upper deviation limit value h of roll gap shape control max And setting a lower deviation limit value h for roll gap shape control min ；
Selecting k plate-shaped control means built by a reversible rolling mill, and setting a total safety coefficient A of the roll gap shape regulation efficacy;
s2, performing roll gap shape control deviation detection according to the detection period length, and acquiring inlet side data of a target pass and outlet side data of the target pass to obtain a roll gap shape control deviation function of the target pass and a roll gap shape adjustment quantity of the target pass;
s3, obtaining a plate shape regulation efficacy function of the target pass according to the roll gap shape regulation quantity of the target pass;
s4, discretizing the plate shape regulation function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval sections;
calculating a roll gap shape control deviation average value of each interval section in 2n interval sections;
s5, combining a control safety coefficient A of plate shape regulation and control efficacy, and respectively combining the average value of the roll gap shape control deviation of each of 2n interval sections with h max Numerical value and h min And comparing the numerical values to obtain a comparison result, and judging whether the rolling mill to be detected has roll gap shape control deviation or not according to the comparison result.
Preferably, the period length of the detecting the deviation of the set roll gap shape control in S1 includes:
Setting and carrying out once roll gap shape control deviation detection after every s times of plate shape regulation;
wherein, the cycle length of a roll gap shape control deviation detection is equal to s times of plate shape regulation.
Preferably, the step S2 of performing roll gap shape control deviation detection according to the detection cycle length, and obtaining the data of the inlet side of the target pass and the data of the outlet side of the target pass, where obtaining the roll gap shape control deviation function of the target pass and the roll gap shape adjustment amount of the target pass includes:
performing plate shape regulation and control for s times;
after the s-time plate shape regulation is finished, an inlet side plate thickness transverse distribution function of a target pass is obtained through an inlet side thickness meter, and an outlet side plate thickness transverse distribution function of the target pass is obtained through an outlet side thickness meter, wherein the target pass is a selected to-be-calculated pass, the inlet side plate thickness transverse distribution function of the target pass is inlet side data of the target pass, and the outlet side plate thickness transverse distribution function of the target pass is outlet side data of the target pass;
obtaining a roll gap shape control deviation function of the target pass according to the outlet side plate thickness transverse distribution function of the target pass, wherein the roll gap shape control deviation function g of the target pass ex (x) The formula of (a) is formula (1):
g ex (x)＝h ex (x)-h ex-input (x) (1)
wherein ,hex (x) And h is the outlet side plate thickness transverse distribution function of the target pass ex-input (x) Is the deviation value of the roll gap shape;
obtaining a roll gap shape adjustment quantity of the target pass 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, wherein the roll gap shape adjustment quantity g of the target pass is obtained rgs (x) The formula of (a) is formula (2):
g rgs (x)＝h ex (x)-h en (x) (2)
wherein ,hen (x) And (5) the transverse distribution function of the thickness of the inlet side plate of the target pass.
Preferably, the step S3 of obtaining the plate shape regulation function of the target pass according to the roll gap shape regulation amount of the target pass includes:
when the target pass drives only one plate shape control means, the plate shape control efficacy function of the target pass is formula (3):
f j (x)＝g rgs (x)/(b cj +b dj ) (3)
wherein j is the current plate shape control means, f j (x) B) regulating the efficacy function for the plate shape of the target pass cj B is the operation regulation quantity of the current plate shape control means dj The transmission side regulation and control quantity of the current plate shape control means;
when the target pass drives more than two plate shape control means, respectively calculating the plate shape regulation and control efficacy function of each plate shape control means of the target pass, wherein the calculation formula of the plate shape regulation and control efficacy function of each plate shape control means of the target pass is formula (4):
f j* (x)＝g rgs (x)/(b cj* +b dj* )×F (4)
wherein ,fj* (x) B) a strip shape control function of the current strip shape control means of the target pass cj* B, controlling the operation of the current plate shape control means of the target pass dj* And F is the regulation and control efficiency ratio of the current plate shape control means to the plate shape control means driven by the target pass.
Preferably, the discretizing the plate shape control efficacy function of the target pass and the roll gap shape control deviation function of the target pass in S4 respectively, and obtaining the corresponding roll gap shape control deviation mean value according to the discretized result includes:
taking 2n sections of discretization segmentation number and 2n sections of plate band segmentation number, and naming the 2n sections of discretization segmentation number and the 2n sections of plate band segmentation number as [ -n, +n ] interval;
in the [ -n, +n ] interval, from [ -n, - (n-1) ] interval to [ n-1, n ] interval, dividing into 2n interval sections with unit length of 1, calculating plate shape regulating and controlling efficacy functions of different plate shape control means in 2n interval sections, and respectively obtaining regulating and controlling efficacy average values of the plate shape control means of each interval section in 2n interval sections;
and regulating and controlling the efficacy mean value according to the plate shape control means of each of the 2n interval sections to obtain a roll gap shape control deviation mean value of each of the 2n interval sections.
Preferably, the control safety factor A of S5 combined with the plate shape regulation effect is obtained by respectively comparing the average value of the roll gap shape control deviation of each of the 2n sections with h max Numerical value and h min The numerical values are compared to obtain a comparison result, and whether the roll gap shape control deviation of the rolling mill to be detected occurs or not is judged according to the comparison result, wherein the step of judging comprises the following steps of:
setting an absolute value |R| of a deviation amount mean value of the plate shape control means calculated currently;
when |R| is less than or equal to h max And- |R|is less than or equal to h min When the roller shape control deviation occurs in the current corresponding secondary channel, a control mechanism is not required to be started, and continuous production is supported;
when |R| > h max And, - |R| > h min When the roll gap shape control deviation of the strip rolling mill is analyzed, the strip rolling mill is subjected to control deviation tracing according to the analysis result;
when |r|=a×h max +m, or, - |r|=a×h max When M, the control deviation of the roll gap shape occurs in the current corresponding secondary channel, and the machine is required to be stopped for maintenance, wherein M is more than or equal to 0.
Preferably, the time |R| > h max And, - |R| > h min When the control deviation of the roll gap shape of the strip rolling mill is analyzed, the control deviation tracing of the strip rolling mill according to the analysis result comprises the following steps:
s501, aiming at k plate-shaped control means built by the reversible rolling mill, obtaining a maximum roll gap shape control deviation section, wherein the maximum roll gap shape control deviation section is recorded as [ i, i+q ] ]Section, calculate [ i, i+q ]]The maximum regulation efficacy in the interval section is marked as f p,[i,i+q] ；
S502, when f p,[i,i+q] <(|h max |+|h min I)/2, the p-th plate shape regulating quantity is increased to the original value (1+g) ex,[i,i+q)] /f p,[i,i+q] ) Doubling;
f p,[i,i+q] ＞(h max +h min ) 2, changing [ -i, - (i+q)]Interval segment sum [ i, (i+q)]Difference in the plate shape control amount of the section such that difference e= (g) ex,[i,i+q)] /f p,[i,i+q] ) No offset plate shape control amount;
s503, recapturing the entrance side data, the exit side data and the plate shape regulation and control efficacy function of the corresponding pass of each plate shape control means, and recalculating the absolute value of the deviation value mean value of the currently calculated plate shape control means to be |R|;
if |R| > h max And, - |R| > h min At this time, S501 is repeatedly performed until it is adjusted to |R| < h max And- |R| < h min The control mechanism is stopped.
A roll gap shape control deviation monitoring system for a reversible rolling mill, comprising:
a setting module for setting a roll gap shape control deviation detection period and setting an upper deviation limit value h of roll gap shape control before rolling production of a plate and strip rolling mill max And setting a lower deviation limit value h for roll gap shape control min The method comprises the steps of carrying out a first treatment on the surface of the Selecting k plate-shaped control means built by a reversible rolling mill, and setting a total safety coefficient A of the roll gap shape regulation efficacy;
the data acquisition module is used for carrying out roll gap shape control deviation detection according to the detection period length, acquiring the inlet side data of a target pass and the outlet side data of the target pass, and obtaining a roll gap shape control deviation function of the target pass and a roll gap shape adjustment quantity of the target pass;
The discrete processing module is used for acquiring a plate shape regulation and control efficacy function of the target pass according to the roll gap shape regulation quantity of the target pass;
the calculation module is used for performing discretization processing on the plate shape regulation efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval sections;
calculating a roll gap shape control deviation average value of each interval section in 2n interval sections;
the plate and strip rolling mill adjusting module is used for combining a control safety coefficient A of plate shape adjusting and controlling efficacy to respectively and uniformly match the roll gap shape control deviation mean value of each of 2n interval sections with h max Numerical value and h min And comparing the numerical values to obtain a comparison result, and judging whether the rolling mill to be detected has roll gap shape control deviation or not according to the comparison result.
Preferably, the cycle length of the set roll gap shape control deviation detection includes:
setting and carrying out once roll gap shape control deviation detection after every s times of plate shape regulation;
wherein, the cycle length of a roll gap shape control deviation detection is equal to s times of plate shape regulation.
Preferably, the detecting the roll gap shape control deviation according to the detection cycle length, obtaining the data of the inlet side of the target pass and the data of the outlet side of the target pass, and obtaining the roll gap shape control deviation function of the target pass and the roll gap shape adjustment quantity of the target pass includes:
Performing plate shape regulation and control for s times;
after the s-time plate shape regulation is finished, an inlet side plate thickness transverse distribution function of a target pass is obtained through an inlet side thickness meter, and an outlet side plate thickness transverse distribution function of the target pass is obtained through an outlet side thickness meter, wherein the target pass is a selected to-be-calculated pass, the inlet side plate thickness transverse distribution function of the target pass is inlet side data of the target pass, and the outlet side plate thickness transverse distribution function of the target pass is outlet side data of the target pass;
obtaining a roll gap shape control deviation function of the target pass according to the outlet side plate thickness transverse distribution function of the target pass, wherein the roll gap shape control deviation function g of the target pass ex (x) The formula of (a) is formula (1):
g ex (x)＝h ex (x)-h ex-input (x) (1)
wherein ,hex (x) And h is the outlet side plate thickness transverse distribution function of the target pass ex-input (x) Deviation value for roll gap shape；
Obtaining a roll gap shape adjustment quantity of the target pass 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, wherein the roll gap shape adjustment quantity g of the target pass is obtained rgs (x) The formula of (a) is formula (2):
g rgs (x)＝h ex (x)-h en (x) (2)
wherein ,hen (x) And (5) the transverse distribution function of the thickness of the inlet side plate of the target pass.
Compared with the prior art, the technical scheme has at least the following beneficial effects:
according to the scheme, the method can realize online detection and online control of roll gap shape control deviation in single rolling production and reciprocating rolling production of the reversible rolling mill, intuitively reflect the roll gap shape control effect influence rule generated by the spatial positions of the operation side and the transmission side of each plate shape control means, rapidly and timely provide a roll gap shape deviation regulation strategy, realize online detection and report regulation of faults of the plate and strip rolling mill, and provide guarantee for continuous and stable production of the plate and strip rolling mill.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling roll gap shape deviation for a reversing mill according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a reversible rolling mill apparatus according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a roll system and a sheet belt segment according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of a roll gap shape control deviation detecting and controlling system for a reversible rolling mill according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, 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 with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Regardless of the rolling mill type, the shape of the rolling mill gap is the fundamental factor affecting the shape of the cross section of the rolled outlet strip. The existing plate shape control means can evaluate the change condition of section parameter indexes such as plate convexity, edge drop value and the like through the thickness change of the outlet side plate, and further drive the devices such as bending rolls, channeling rolls, roll crossing and the like to adjust the roll gap shape. However, the traditional detection and control means are difficult to identify the control deviation caused by the abrasion or dislocation of the rolling mill, and are more difficult to regulate and control by using the original roll gap shape control strategy. Aiming at the problems, the invention provides a roll gap shape control deviation detection and control method and a system for a reversible rolling mill, which can detect and calibrate the roll gap shape control deviation of a single-frame and multi-frame reversible rolling mill, trace the deviation according to the deviation, further provide a deviation control method, effectively improve the roll gap control capability of the rolling mill,
As shown in fig. 2 and 3, the regulatory assembly of the present application includes: left thickness gauge 1, left plate shape gauge 2, left crimping roller 3, lower work roller 4, lower backup roller 5, upper backup roller 6, upper work roller 7, right thickness gauge 8, right plate shape gauge 9, right crimping roller 10.
The layout of the reversible rolling mill adopts a bilateral symmetry structure, and fig. 2 shows a single-frame reversible rolling mill, wherein the left side and the right side of the reversible rolling mill are respectively provided with a left thickness gauge 1, a left plate shape gauge 2, a left crimping roller 3, a right thickness gauge 8, a right plate shape gauge 9 and a right crimping roller 10. The main body of the rolling mill is composed of a lower working roll 4, a lower supporting roll 5, an upper supporting roll 6 and an upper working roll 7, the detecting device of the reversible rolling mill is composed of a left thickness gauge 1, a left plate shape gauge 2, a right thickness gauge 8 and a right plate shape gauge 9, and the opening and the rolling of the reversible rolling mill are performed by the left crimping roll 3 and the right crimping roll 10 in a linkage way according to the rolling direction. The detection device can feed back production line information to the roll gap shape control deviation calculation system in real time in the rolling production process of the reversible rolling mill. The left thickness gauge 1 is arranged between the left plate gauge 2 and the rolling mill main body, the right thickness gauge 8 is arranged between the right plate gauge 9 and the rolling mill main body, and the two thickness gauges and the plate gauges need to sequentially transmit signals according to the spatial position sequence.
If the rolling direction is from left to right, the roll gap shape control deviation calculation system sequentially collects the initial plate shape of the plate strip at the left inlet, the initial plate thickness of the plate strip at the left inlet, the plate thickness of the plate strip at the right inlet and the plate shape of the plate strip at the right inlet so as to reduce the interference of curling on the plate thickness values of all the sections of the plate strip required by the system calculation. If the rolling direction is from right to left, the roll gap shape control deviation calculation system sequentially collects the initial plate shape of the plate strip at the right inlet, the initial plate thickness of the plate strip at the right inlet, the plate thickness of the plate strip at the left inlet and the plate shape of the plate strip outlet at the left inlet.
The left thickness gauge 1, the left plate shape gauge 2, the right thickness gauge 8 and the right plate shape gauge 9 all adopt sectional detection modes. The plate belt is divided into 2n sections at equal intervals in the axial direction, the section interval from the operation side to the transmission side is [ -n, +n ], and the 0 th section is positioned at the center of the plate belt; the detection areas of the left side thickness gauge 1, the left side plate shape gauge 2, the right side thickness gauge 8 and the right side plate shape gauge 9 are also divided into 2m sections, the section interval from the operation side to the transmission side is [ -m, +m ], and the 0 th section is positioned at the center of each detection device. The length of the section of the plate and strip dividing section 2n is equal to that of the section of the detecting area 2m, and the value of the section number 2m is larger than that of the section number 2n, so that plate and strip information of different plate widths can be accurately acquired. For the ith section detection area (-n is less than or equal to i is less than or equal to +n) of the plate and the jth section detection area (-m is less than or equal to j is less than or equal to +m) of the detection device, if the value of i is equal to the value of j, the detection area of the plate and the detection areas of the detection devices are positioned in the same control interval.
The lower working roll 4, the lower supporting roll 5, the upper supporting roll 6 and the upper working roll 7 which are included in the rolling mill main body can be provided with plate-shaped control devices such as bending rolls, channeling rolls, roll crossings and the like, and the plate-shaped control quantity can be adjusted in an external secondary control system so as to adjust the shape of a roll gap. The external secondary control system can take the interface of the operation side and the transmission side as a symmetrical plane, symmetrically adjust the plate shape control quantity of the operation side and the transmission side, and further change the roll gap to a flat shape.
The plate shape control quantity of the bending roll, the channeling roll, the roller crossing and the like can be transmitted to a roll gap shape control deviation calculation system by a secondary control system and used for solving the roll gap shape control deviation quantity. The roll gap shape control deviation calculating system can be started from the beginning of plate and strip rolling, and the time interval of sampling, calculating and other operations can be selected to be calculated once after plate shape regulation is performed every s times.
Based on the above-mentioned control components, as shown in fig. 1, the present application provides a roll gap shape control deviation detection and control method for a reversible rolling mill, comprising the following steps:
s1, before rolling production of a plate and strip rolling mill, setting a roll gap shape control deviation detection period and setting an upper deviation limit value h of roll gap shape control max And setting the shape control of the roll gap
Deviation limit value h min ；
And selecting k plate-shaped control means built by the reversible rolling mill, and setting the total safety coefficient A of the roll gap shape regulation and control effect.
Preferably, the period length of the detecting the deviation of the set roll gap shape control in S1 includes:
setting and carrying out once roll gap shape control deviation detection after every s times of plate shape regulation; the cycle length of the detection of the control deviation of the shape of the roll gap is equal to s times of plate shape regulation.
In a specific embodiment, S1, a roll gap shape control deviation detection period (a roll gap shape control deviation detection is performed once after every S plate shape adjustments) is set before rolling is performed, and upper and lower deviation limit values h of the roll gap shape control are set max And h min The method comprises the steps of carrying out a first treatment on the surface of the Selecting a reversible rolling mill to carry k plate-shaped control means together, and setting a total safety coefficient A of the roll gap shape regulation efficacy;
the roll gap shape control deviation detection is used for detecting a deviation value of an actual roll gap shape and an ideal roll gap shape, and specifically comprises the following steps: after undergoing s times of plate shape regulation, a transverse (width direction) distribution function h of the plate thickness at the outlet side is obtained by using a rolling mill outlet side thickness gauge ex (x) And the measured data h ex (x) And ideal data h ex-input (x) Making differences one by one to obtain a roll gap shape control deviation value function g ex (x)。
Wherein, the strip shape control means k carried by the reversible rolling mill of S1 comprises:
setting a deviation-free strip shape regulation efficacy function f of the strip shape control means of the 1 st item 1, plate shape control amount (x)；
Setting a deviation-free plate shape regulation efficacy function f of the plate shape control means of the 2 nd item 2, plate shape control amount (x)；
Non-deviation plate shape regulating efficacy function f of plate shape control means up to the k-th item k, plate shape control amount (x)；
Wherein k is a positive integer.
S2, performing roll gap shape control deviation detection according to the detection period length, and obtaining inlet side data of a target pass and outlet side data of the target pass to obtain a roll gap shape control deviation function of the target pass and a roll gap shape adjustment quantity of the target pass.
The method specifically comprises the following steps:
performing plate shape regulation and control for s times;
after the s-time plate shape regulation is finished, an inlet side plate thickness transverse distribution function of a target pass is obtained through an inlet side thickness meter, and an outlet side plate thickness transverse distribution function of the target pass is obtained through an outlet side thickness meter, wherein the target pass is a selected to-be-calculated pass, the inlet side plate thickness transverse distribution function of the target pass is inlet side data of the target pass, and the outlet side plate thickness transverse distribution function of the target pass is outlet side data of the target pass;
Obtaining a roll gap shape control deviation function of the target pass according to the outlet side plate thickness transverse distribution function of the target pass, wherein the roll gap shape control deviation function g of the target pass ex (x) The formula of (a) is formula (1):
g ex (x)＝h ex (x)-h ex-input (x) (1)
wherein ,hex (x) And h is the outlet side plate thickness transverse distribution function of the target pass ex-input (x) Is the deviation value of the roll gap shape;
obtaining a roll gap shape adjustment quantity of the target pass 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, wherein the roll gap shape adjustment quantity g of the target pass is obtained rgs (x) The formula of (a) is formula (2):
g rgs (x)＝h ex (x)-h en (x) (2)
wherein ,hen (x) And (5) the transverse distribution function of the thickness of the inlet side plate of the target pass.
In a specific embodiment, the step S2 includes:
after s times of plate shape regulation, the inlet side plate thickness transverse distribution function h is respectively obtained through an inlet side thickness gauge and an outlet side thickness gauge en(x) and hex (x) Calculating the roll gap shape control deviation function g of the pass ex (x)＝h ex (x)-h ex-input (x) And the roll gap shape adjustment quantity g of the pass rgs (x)＝h ex (x)-h en (x) The method comprises the steps of carrying out a first treatment on the surface of the At the same time, the operation control quantity [ b ] of k plate-shaped control means in the present pass is obtained c1 ,b c2 ,…,b ck ]And transmission side control quantity [ b ] d1 ,b d2 ,…,b dk ]。
S3, acquiring a plate shape regulation efficacy function of the target pass according to the roll gap shape regulation quantity of the target pass, wherein the plate shape regulation efficacy function specifically comprises the following steps:
When the target pass drives only one plate shape control means, the plate shape control efficacy function of the target pass is formula (3):
f j (x)＝g rgs (x)/(b cj +b dj ) (3)
wherein j is the current plate shape control means, f j (x) B) regulating the efficacy function for the plate shape of the target pass cj B is the operation regulation quantity of the current plate shape control means dj The transmission side regulation and control quantity of the current plate shape control means;
when the target pass drives more than two plate shape control means, respectively calculating the plate shape regulation and control efficacy function of each plate shape control means of the target pass, wherein the calculation formula of the plate shape regulation and control efficacy function of each plate shape control means of the target pass is formula (4):
f j* (x)＝g rgs (x)/(b cj* +b dj* )×F (4)
wherein ,fj* (x) B) a strip shape control function of the current strip shape control means of the target pass cj* B, controlling the operation of the current plate shape control means of the target pass dj* And F is the regulation and control efficiency ratio of the current plate shape control means to the plate shape control means driven by the target pass.
In a specific embodiment, step S3 specifically includes:
according to the roll gap shape adjustment quantity g of the pass rgs (x) Obtaining a plate shape regulation and control efficacy function of the plate shape control means of the pass;
if only one plate-shaped control means j is driven in this pass, the control efficacy function can be expressed as f j (x)＝g rgs (x)/(b cj +b dj )；
If the two types of the driving pass are the plate shape control means j and the plate shape control means h, the regulating and controlling 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 ) Wherein s is the current-pass regulation efficacy ratio of the plate-shaped control means j.
S4, discretizing the plate shape regulation function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval sections; calculating a roll gap shape control deviation average value of each interval section in 2n interval sections, wherein the roll gap shape control deviation average value specifically comprises the following steps:
and S4, discretizing the plate shape regulation efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively, and obtaining a corresponding roll gap shape control deviation mean value according to the discretized result comprises the following steps:
taking 2n sections of discretization segmentation number and 2n sections of plate band segmentation number, and naming the 2n sections of discretization segmentation number and the 2n sections of plate band segmentation number as [ -n, +n ] interval;
in the [ -n, +n ] interval, from [ -n, - (n-1) ] interval to [ n-1, n ] interval, dividing into 2n interval sections with unit length of 1, calculating plate shape regulating and controlling efficacy functions of different plate shape control means in 2n interval sections, and respectively obtaining regulating and controlling efficacy average values of the plate shape control means of each interval section in 2n interval sections;
And regulating and controlling the efficacy mean value according to the plate shape control means of each of the 2n interval sections to obtain a roll gap shape control deviation mean value of each of the 2n interval sections.
In a specific embodiment, step S4 includes:
controlling a deviation function g for the roll gap shape of the pass ex (x) And the plate shape control means of the pass regulate and control the efficacy function f j (x) Discretizing, wherein the number of discretized segments is the same as that of the plate belt segments, 2n segments are taken and named [ -n, +n]A section;
from [ -n, - (n-1)]The interval is from [ -n, +n]In the interval, the regulation and control efficacy functions f of different plate shape control means in 2n interval sections are calculated in sequence 1 (x)、f 2 (x)、…、f k (x) And obtaining the average value f of the regulation and control efficacy of each plate shape control means in 2n interval sections 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] ；
From [ -n, - (n-1)]The interval is from [ -n, +n]In the interval, the average value g of the roll gap shape control deviation of 2n sections is sequentially calculated ex,[-n,-(n-1)] 、…、g ex,[n-1,n] 。
S5, combining a control safety coefficient A of plate shape regulation and control efficacy, and respectively combining the average value of the roll gap shape control deviation of each of 2n interval sections with h max Numerical value and h min And comparing the numerical values to obtain a comparison result, and judging whether the rolling mill to be detected has roll gap shape control deviation or not according to the comparison result.
In a specific embodiment, the step S5 specifically includes:
combining the total safety coefficient A of the roll gap shape regulating and controlling effects, and controlling the roll gap shape control deviation average value g of the 2n sections ex,[-n,-(n-1)] 、…、g ex,[n-1,n] And set h max H min Comparing, judging whether the rolling mill to be detected has roll gap shape control deviation according to a comparison result, wherein the absolute value |R| of the deviation value mean value of the plate shape control means calculated at present is set as a formula (5);
when |R| is less than or equal to h max And- |R|is less than or equal to h min When the roller shape control deviation occurs in the current corresponding secondary channel, a control mechanism is not required to be started, and continuous production is supported;
when |R| > h max And, - |R| > h min When the roll gap shape control deviation of the strip rolling mill is analyzed, the strip rolling mill is subjected to control deviation tracing according to the analysis result;
when |r|=a×h max +m, or, - |r|=a×h max When M, the control deviation of the roll gap shape occurs in the current corresponding secondary channel, and the machine is required to be stopped for maintenance, wherein M is more than or equal to 0.
Wherein, when |R| > h max And, - |R| > h min When the strip rolling mill is used, analyzing the condition that the strip rolling mill has roll gap shape control deviation, and rolling the strip according to the analysis resultThe machine control deviation tracing comprises:
s501, aiming at k plate-shaped control means built by the reversible rolling mill, obtaining a maximum roll gap shape control deviation section, wherein the maximum roll gap shape control deviation section is recorded as [ i, i+q ] ]Section, calculate [ i, i+q ]]The maximum regulation efficacy in the interval section is marked as f p,[i,i+q] ；
S502, when f p,[i,i+q] <(|h max |+|h min I)/2, the p-th plate shape regulating quantity is increased to the original value (1+g) ex,[i,i+q)] /f p,[i,i+q] ) Doubling;
f p,[i,i+q] ＞(h max +h min ) 2, changing [ -i, - (i+q)]Interval segment sum [ i, (i+q)]Difference in the plate shape control amount of the section such that difference e= (g) ex,[i,i+q)] /f p,[i,i+q] ) No offset plate shape control amount;
s503, recapturing the entrance side data, the exit side data and the plate shape regulation and control efficacy function of the corresponding pass of each plate shape control means, and recalculating the absolute value of the deviation value mean value of the currently calculated plate shape control means to be |R|;
if |R| > h max And, - |R| > h min At this time, S501 is repeatedly performed until it is adjusted to |R| < h max And- |R| < h min The control mechanism is stopped.
A specific implementation mode of the method in production is as follows:
before rolling production, setting a detection period length for a roll gap shape control deviation calculation system, and calculating a roll gap shape control deviation after setting each s plate shape regulation; setting 3 items of strip shape control means carried by the reversible rolling mill, and accounting for a non-deviation strip shape regulation and control efficacy function f of the strip shape control means of the 1 st item 1, plate shape control amount (x) Non-deviation strip shape regulating efficacy function f of strip shape control means of item 2 2, plate shape control amount (x) Non-deviation strip shape regulating efficacy function f of strip shape control means of item 3 3 plate shape control amount (x) The method comprises the steps of carrying out a first treatment on the surface of the Setting the upper limit value h of the control deviation of the plate shape regulating and controlling efficacy max = +10 μm and lower limit h min = -10 μm, and control safety factor a=3 of plate shape regulation efficacy is set。
Producing a plate strip rolling mill and performing plate shape regulation and control for 10 times to obtain inlet side data and outlet side data; and obtaining each pass of plate shape regulation and control efficacy function of each plate shape control means.
Discretizing the plate shape regulating function, wherein the number of discretized segments is the same as that of plate and belt segments, 20 segments are taken, and the intervals of [ -10, +10] are named.
From [ -10, -9]From the section, sequentially calculating the deviation value h of the pass and the unbiased pass of each plate shape regulation efficacy function 1, plate shape control amount (x)、h 2, plate shape control amount (x)、h 3 plate shape control amount (x) The calculation method is h k, plate shape control amount (x)＝g k, plate shape control amount (x)-f k, plate shape control amount (x) The method comprises the steps of carrying out a first treatment on the surface of the Calculating the deviation value average value h of each plate shape regulating means of the section 1, plate shape control amount, [ -10, -9] ＝11μm、h 2, plate shape control amount, [ -10, -9] ＝3μm、h k, plate shape control amount, [ -10, -9] ＝7μm。
The average value of the deviation of the plate shape regulating means 1 is larger than h max The number of the components is = +10 μm, the rolling mill now has significant roll gap shape control deviations, and opening a control mechanism and performing callback.
And comparing the deviation value average value of each plate shape control means of each section, and extracting the plate shape control means 1 with the maximum control deviation of the plate shape regulation and control effect and the appearance positions [6,7].
Gauge f 1, plate shape control amount (x)＝h 1, plate shape control amount [6,7] -h 1, plate shape control amount, [ -7, -6] ＝11.5μm，f p, plate shape control amount (x)>The deviation of the roll gap shape control of the plate shape control means is caused by the spatial position difference between the roll operation side and the transmission side on which the plate shape control means is mounted, 10 μm. For callback of the board control means, change [6,7] is needed]Segment side and [ -7, -6]The difference value of the plate shape control quantity at the section side is calculated by the hydraulic bending roller as the plate shape control means, and the difference value=36 kN.
After the plate shape control quantity is adjusted, acquiring the data of the inlet side, the data of the outlet side and the plate shape regulation function of the adjusted pass of each plate shape control means again, executing the fourth step and the fifth step, and stopping the control mechanism without the occurrence of the maximum deviation value.
The method can realize the online detection and online control of the roll gap shape control deviation in the single rolling production and the reciprocating rolling production of the reversible rolling mill, can intuitively reflect the roll gap shape control effect influence rule generated by the spatial positions of the operation side and the transmission side of each plate shape control means of the rolling mill, rapidly and timely provides a roll gap shape deviation regulation strategy, realizes the online detection and report regulation of the faults of the plate and strip rolling mill, and provides a guarantee for continuous and stable production of the plate and strip rolling mill.
As shown in fig. 4, a roll gap shape control deviation detecting and controlling system for a reversible rolling mill, comprising:
a setting module 100 for setting a roll gap shape control deviation detection period and an upper deviation limit value h of roll gap shape control before rolling production of a strip mill max And setting a lower deviation limit value h for roll gap shape control min The method comprises the steps of carrying out a first treatment on the surface of the Selecting k plate-shaped control means built by a reversible rolling mill, and setting a total safety coefficient A of the roll gap shape regulation efficacy;
the data acquisition module 200 is 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;
the discrete processing module 300 is configured to obtain a plate shape regulation function of the target pass according to the roll gap shape adjustment amount of the target pass;
the calculation module 400 is configured to perform discretization processing on the plate shape regulation efficacy function of the target pass and the roll gap shape control deviation function of the target pass, so as to obtain 2n interval sections;
calculating a roll gap shape control deviation average value of each interval section in 2n interval sections;
The strip mill adjusting module 500 is configured to combine the control safety factor a of the strip shape adjusting and controlling effect to respectively average the roll gap shape control deviation of each of the 2n sections with h max Numerical value and h min And comparing the numerical values to obtain a comparison result, and judging whether the rolling mill to be detected has roll gap shape control deviation or not according to the comparison result.
Preferably, the cycle length of the set roll gap shape control deviation detection includes:
setting and carrying out once roll gap shape control deviation detection after every s times of plate shape regulation;
wherein, the cycle length of a roll gap shape control deviation detection is equal to s times of plate shape regulation.
Preferably, the detecting the roll gap shape control deviation according to the detection cycle length, obtaining the data of the inlet side of the target pass and the data of the outlet side of the target pass, and obtaining the roll gap shape control deviation function of the target pass and the roll gap shape adjustment quantity of the target pass includes:
performing plate shape regulation and control for s times;
after the s-time plate shape regulation is finished, an inlet side plate thickness transverse distribution function of a target pass is obtained through an inlet side thickness meter, and an outlet side plate thickness transverse distribution function of the target pass is obtained through an outlet side thickness meter, wherein the target pass is a selected to-be-calculated pass, the inlet side plate thickness transverse distribution function of the target pass is inlet side data of the target pass, and the outlet side plate thickness transverse distribution function of the target pass is outlet side data of the target pass;
Obtaining a roll gap shape control deviation function of the target pass according to the outlet side plate thickness transverse distribution function of the target pass, wherein the roll gap shape control deviation function g of the target pass ex (x) The formula of (a) is formula (1):
g ex (x)＝h ex (x)-h ex-input (x) (1)
wherein ,hex (x) And h is the outlet side plate thickness transverse distribution function of the target pass ex-input (x) Is the deviation value of the roll gap shape;
obtaining the roll gap shape adjustment quantity of the target pass 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 quantity g of the target pass rgs (x) The formula of (a) is formula (2):
g rgs (x)＝h ex (x)-h en (x) (2)
wherein ,hen (x) And (5) the transverse distribution function of the thickness of the inlet side plate of the target pass.
The system can realize the online detection and online control of the roll gap shape control deviation in the single rolling production and the reciprocating rolling production of the reversible rolling mill, can intuitively reflect the roll gap shape control effect influence rule generated by the spatial positions of the operation side and the transmission side of each plate shape control means of the rolling mill, rapidly and timely provides a roll gap shape deviation regulation strategy, realizes the online detection and report regulation of the faults of the plate and strip rolling mill, and provides a guarantee for continuous and stable production of the plate and strip rolling mill.
Fig. 5 is a schematic structural diagram of an electronic device 700 according to an embodiment of the present invention, where the electronic device 600 may have a relatively large difference due to different configurations or performances, and may include one or more processors (central processing units, CPU) 710 and one or more memories 720, where at least one instruction is stored in the memories 720, and the at least one instruction is loaded and executed by the processors 710 to implement the steps of a roll gap shape control deviation checking method for a reversible rolling mill.
In an exemplary embodiment, a computer readable storage medium, such as a memory including instructions executable by a processor in a terminal to perform a roll gap shape control deviation checking method for a reversible rolling mill as described above, is also provided. For example, the computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
The above embodiments are not limited to the technical solution of the embodiments, and the embodiments may be combined with each other to form a new embodiment. The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and any modifications or equivalent substitutions without departing from the spirit and scope of the present invention should be covered in the scope of the technical solution of the present invention.
Claims (10)
1. A roll gap shape control deviation detection and control method for a reversible rolling mill, comprising the steps of:
s1, before rolling production of a plate and strip rolling mill, setting a roll gap shape control deviation detection period and setting an upper deviation limit value h of roll gap shape control max And setting a lower deviation limit value h for roll gap shape control min ；
Selecting k plate-shaped control means built by a reversible rolling mill, and setting a total safety coefficient A of the roll gap shape regulation efficacy;
s2, performing roll gap shape control deviation detection according to the detection period length, and acquiring inlet side data of a target pass and outlet side data of the target pass to obtain a roll gap shape control deviation function of the target pass and a roll gap shape adjustment quantity of the target pass;
s3, obtaining a plate shape regulation efficacy function of the target pass according to the roll gap shape regulation quantity of the target pass;
s4, discretizing the plate shape regulation function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval sections;
calculating a roll gap shape control deviation average value of each interval section in 2n interval sections;
s5, combining a control safety coefficient A of plate shape regulation and control efficacy, and respectively combining the average value of the roll gap shape control deviation of each of 2n interval sections with h max Numerical value and h min And comparing the numerical values to obtain a comparison result, and judging whether the rolling mill to be detected has roll gap shape control deviation or not according to the comparison result.
2. The roll gap shape control deviation detecting and controlling method for a reversible rolling mill according to claim 1, wherein the period length of the set roll gap shape control deviation detection of S1 includes:
setting and carrying out once roll gap shape control deviation detection after every s times of plate shape regulation;
wherein, the cycle length of a roll gap shape control deviation detection is equal to s times of plate shape regulation.
3. The method for detecting and controlling the roll gap shape control deviation of a reversible rolling mill according to claim 1, wherein the step S2 of detecting the roll gap shape control deviation according to the detection cycle length, obtaining the entry side data of the target pass and the exit side data 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 comprises:
performing plate shape regulation and control for s times;
after the s-time plate shape regulation is finished, an inlet side plate thickness transverse distribution function of a target pass is obtained through an inlet side thickness meter, and an outlet side plate thickness transverse distribution function of the target pass is obtained through an outlet side thickness meter, wherein the target pass is a selected to-be-calculated pass, the inlet side plate thickness transverse distribution function of the target pass is inlet side data of the target pass, and the outlet side plate thickness transverse distribution function of the target pass is outlet side data of the target pass;
Obtaining a roll gap shape control deviation function of the target pass according to the outlet side plate thickness transverse distribution function of the target pass, wherein the roll gap shape control deviation function g of the target pass rgs (x) The formula of (a) is formula (1):
g ex (x)＝h ex (x)-h ex-input (x) (1)
wherein ,hex (x) And h is the outlet side plate thickness transverse distribution function of the target pass ex-input (x) Is the deviation value of the roll gap shape;
obtaining a roll gap shape adjustment quantity of the target pass 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, wherein the roll gap shape adjustment quantity g of the target pass is obtained rgs (x) The formula of (a) is formula (2):
g rgs (x)＝h ex (x)-h en (x) (2)
wherein ,hen (x) For the target passInlet side plate thickness transverse distribution function.
4. The method according to claim 1, wherein the step of S3 of obtaining the plate shape control function of the target pass according to the roll gap shape adjustment amount of the target pass comprises:
when the target pass drives only one plate shape control means, the plate shape control efficacy function of the target pass is formula (3):
f j (x)＝g rgs (x)/(b cj +b dj ) (3)
wherein j is the current plate shape control means, f j (x) B) regulating the efficacy function for the plate shape of the target pass cj B is the operation regulation quantity of the current plate shape control means dj The transmission side regulation and control quantity of the current plate shape control means;
when the target pass drives more than two plate shape control means, respectively calculating the plate shape regulation and control efficacy function of each plate shape control means of the target pass, wherein the calculation formula of the plate shape regulation and control efficacy function of each plate shape control means of the target pass is formula (4):
wherein ,a strip shape control function of the current strip shape control means for the target pass, < >>For the control of the current plate-shaped control means of the target pass,/control of the control means>For the target trackAnd F is the regulation and control efficiency ratio of the plate shape control means which is driven by the current plate shape control means in the target pass.
5. The method for detecting and controlling the roll gap shape control deviation of a reversible rolling mill according to claim 1, wherein the step S4 of discretizing the plate shape control efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively, and obtaining the corresponding roll gap shape control deviation average value according to the discretized result comprises:
Taking 2n sections of discretization segmentation number and 2n sections of plate band segmentation number, and naming the 2n sections of discretization segmentation number and the 2n sections of plate band segmentation number as [ -n, +n ] interval;
in the [ -n, +n ] interval, from [ -n, - (n-1) ] interval to [ n-1, n ] interval, dividing into 2n interval sections with unit length of 1, calculating plate shape regulating and controlling efficacy functions of different plate shape control means in 2n interval sections, and respectively obtaining regulating and controlling efficacy average values of the plate shape control means of each interval section in 2n interval sections;
and regulating and controlling the efficacy mean value according to the plate shape control means of each of the 2n interval sections to obtain a roll gap shape control deviation mean value of each of the 2n interval sections.
6. The method for controlling deviation of roll gap shape in reversible rolling mill according to claim 1, wherein the control safety factor A of S5 combined with plate shape control efficacy is to combine the average value of roll gap shape control deviation of each of 2n sections with h max Numerical value and h min The numerical values are compared to obtain a comparison result, and whether the roll gap shape control deviation of the rolling mill to be detected occurs or not is judged according to the comparison result, wherein the step of judging comprises the following steps of:
setting an absolute value |R| of a deviation amount mean value of the plate shape control means calculated currently;
When |R| is less than or equal to h max And- |R|is less than or equal to h min When the roller shape control deviation occurs to the current corresponding secondary channel, a control mechanism is not required to be startedSupport continuous production;
when |R| > h max And, - |R| > h min When the roll gap shape control deviation of the strip rolling mill is analyzed, the strip rolling mill is subjected to control deviation tracing according to the analysis result;
when |r|=a×h max +m, or, - |r|=a×h max When M, the control deviation of the roll gap shape occurs in the current corresponding secondary channel, and the machine is required to be stopped for maintenance, wherein M is more than or equal to 0.
7. The method for controlling deviation of roll gap shape in reversing mill according to claim 4, wherein when |R| > h max And, - |R| > h min When the control deviation of the roll gap shape of the strip rolling mill is analyzed, the control deviation tracing of the strip rolling mill according to the analysis result comprises the following steps:
s501, aiming at k plate-shaped control means built by the reversible rolling mill, obtaining a maximum roll gap shape control deviation section, wherein the maximum roll gap shape control deviation section is recorded as [ i, i+q ]]Section, calculate [ i, i+q ]]The maximum regulation efficacy in the interval section is marked as f p,[i,i+q] ；
S502, when f p,[i,i+q] <(|h max |+|h min I)/2, the p-th plate shape regulating quantity is increased to the original value (1+g) ex,[i,i+q)] /f p,[i,i+q] ) Doubling;
f p,[i,i+q] ＞(h max +h min ) 2, changing [ -i, - (i+q) ]Interval segment sum [ i, (i+q)]Difference in the plate shape control amount of the section such that difference e= (g) ex,[i,i+q)] /f p,[i,i+q] ) No offset plate shape control amount;
s503, recapturing the entrance side data, the exit side data and the plate shape regulation and control efficacy function of the corresponding pass of each plate shape control means, and recalculating the absolute value of the deviation value mean value of the currently calculated plate shape control means to be |R|;
if |R| > h max And, - |R| > h min At this time, S501 is repeatedly performed until it is adjusted to |R| < h max And- |R| < h min The control mechanism is stopped.
8. A roll gap shape control deviation inspection and control system for a reversible rolling mill, comprising:
a setting module for setting a roll gap shape control deviation detection period and setting an upper deviation limit value h of roll gap shape control before rolling production of a plate and strip rolling mill max And setting a lower deviation limit value h for roll gap shape control min The method comprises the steps of carrying out a first treatment on the surface of the Selecting k plate-shaped control means built by a reversible rolling mill, and setting a total safety coefficient A of the roll gap shape regulation efficacy;
the data acquisition module is used for carrying out roll gap shape control deviation detection according to the detection period length, acquiring the inlet side data of a target pass and the outlet side data of the target pass, and obtaining a roll gap shape control deviation function of the target pass and a roll gap shape adjustment quantity of the target pass;
The discrete processing module is used for acquiring a plate shape regulation and control efficacy function of the target pass according to the roll gap shape regulation quantity of the target pass;
the calculation module is used for performing discretization processing on the plate shape regulation efficacy function of the target pass and the roll gap shape control deviation function of the target pass respectively to obtain 2n interval sections;
calculating a roll gap shape control deviation average value of each interval section in 2n interval sections;
the plate and strip rolling mill adjusting module is used for combining a control safety coefficient A of plate shape adjusting and controlling efficacy to respectively and uniformly match the roll gap shape control deviation mean value of each of 2n interval sections with h max Numerical value and h min And comparing the numerical values to obtain a comparison result, and judging whether the rolling mill to be detected has roll gap shape control deviation or not according to the comparison result.
9. The roll gap shape control deviation detecting and controlling system for a reversible rolling mill according to claim 8, wherein the cycle length of the set roll gap shape control deviation detecting comprises:
setting and carrying out once roll gap shape control deviation detection after every s times of plate shape regulation;
wherein, the cycle length of a roll gap shape control deviation detection is equal to s times of plate shape regulation.
10. The roll gap shape control deviation detecting system for a reversible rolling mill according to claim 8, wherein the performing roll gap shape control deviation detection according to the detection cycle length, obtaining the entry side data of the target pass and the exit side data of the target pass, obtaining the roll gap shape control deviation function of the target pass and the roll gap shape adjustment amount of the target pass includes:
Performing plate shape regulation and control for s times;
after the s-time plate shape regulation is finished, an inlet side plate thickness transverse distribution function of a target pass is obtained through an inlet side thickness meter, and an outlet side plate thickness transverse distribution function of the target pass is obtained through an outlet side thickness meter, wherein the target pass is a selected to-be-calculated pass, the inlet side plate thickness transverse distribution function of the target pass is inlet side data of the target pass, and the outlet side plate thickness transverse distribution function of the target pass is outlet side data of the target pass;
obtaining a roll gap shape control deviation function of the target pass according to the outlet side plate thickness transverse distribution function of the target pass, wherein the roll gap shape control deviation function g of the target pass ex (x) The formula of (a) is formula (1):
g ex (x)＝h ex (x)-h ex-input (x)(1)
wherein ,hex (x) And h is the outlet side plate thickness transverse distribution function of the target pass ex-input (x) Is the deviation value of the roll gap shape;
obtaining a roll gap shape adjustment quantity of the target pass 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, wherein the roll gap shape adjustment quantity g of the target pass is obtained rgs (x) The formula of (a) is formula (2):
g rgs (x)＝h ex (x)-h en (x)(2)
wherein ,hen (x) And (5) the transverse distribution function of the thickness of the inlet side plate of the target pass.
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