Strip Mill Roll Cross and Offset Prediction Method and Related Equipment

Abstract

The present invention provides a method and related equipment for predicting the cross and offset of rolls of a strip rolling mill. The method includes: obtaining the original ultimate regulation efficacy functions of the respective rolls of the strip rolling mill; obtaining the actual ultimate regulation efficacy functions of the respective rolls; determining the offset information of the respective rolls according to the original ultimate regulation efficacy functions and the actual ultimate regulation efficacy functions; determining the cross information of the respective rolls according to the original ultimate regulation efficacy functions and the actual ultimate regulation efficacy functions; and generating a roll offset warning message and a roll cross warning message respectively according to the offset information and the cross information. The method for predicting the cross and offset of rolls of the strip rolling mill provided by the present invention can timely detect the roll offset phenomenon and the roll cross phenomenon generated by the respective rolls during the production process, and generate a roll offset warning message and a roll cross warning message to give a prompt, thereby reducing the wear of the strip rolling mill, extending the service life of the strip rolling mill, improving the yield rate and reducing the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of strip rolling mills, and particularly to a method for predicting the cross and offset of rolls of a strip rolling mill and related equipment. Background Art

[0002] After the roll system is assembled and installed on the machine, there will inevitably be a certain degree of cross and offset between the rolls. After long-distance rolling, the wear between the roll bearing liners and the machine base liners will further occur, exacerbating the cross and offset of the rolls. When the degree of cross and offset accumulates to a certain level, the corresponding regulation capabilities of the shape control devices arranged on both sides of the rolling mill will be weakened to varying degrees, and even the original shape control capabilities cannot be achieved.

[0003] In the related art, in order to detect and correct the cross and offset phenomena of the rolls, usually, the operator analyzes the shape of the strip after rolling. When there are shape problems that cannot be adjusted, the initial shape and the shape of the strip after rolling are compared to determine whether there is roll cross or roll offset. However, such a detection method is difficult to achieve early prediction, and thus it is impossible to detect the offset and cross phenomena of the rolls in time, resulting in serious wear of the liners and failure of shape control, seriously affecting the service life and rolling accuracy of the strip rolling mill and increasing production costs. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] For this reason, a first aspect of the present invention provides a method for predicting the cross and offset of rolls of a strip rolling mill.

[0006] A second aspect of the present invention provides a device for predicting the cross and offset of rolls of a strip rolling mill.

[0007] A third aspect of the present invention provides a storage medium.

[0008] A fourth aspect of the present invention provides an electronic device.

[0009] In view of this, according to the first aspect of the embodiments of the present application, a method for predicting the cross and offset of rolls of a strip rolling mill is proposed, including:

[0010] Obtaining the original limit regulation efficacy function of each roll of the strip rolling mill;

[0011] Obtaining the actual limit regulation efficacy function of each roll;

[0012] Determining the offset information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function;

[0013] Determining the cross information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function;

[0014] Generate a roll offset warning message and a roll crossing warning message respectively according to the offset information and the crossing information.

[0015] In a feasible implementation manner, the original limit regulation efficacy function is the lateral distribution function of the load bearing roll gap deformation amount generated when each roll is rolled under a single limit shape regulation amount in the case where the strip mill is in an initial state;

[0016] The actual limit regulation efficacy function is the lateral distribution function of the load bearing roll gap deformation amount generated when each roll is rolled under a single limit shape regulation amount in the case where the strip mill reaches a preset detection period.

[0017] In a feasible implementation manner, the steps of obtaining the original limit regulation efficacy function of each roll of the strip mill include:

[0018] In the case where the strip mill is in an initial state, sequentially take each roll as the first current observed roll;

[0019] Adjust the bending roll force of the first current observed roll to the limit bending roll force, adjust the shifting amount of the first current observed roll to 0, and adjust the bending roll forces and shifting amounts of the remaining rolls to 0;

[0020] Control the strip mill to perform rolling, and obtain the first deformation amount of the load bearing roll gap;

[0021] According to the first deformation amount, determine the original positive bending limit bending roll force regulation efficacy function and the original negative bending limit bending roll force regulation efficacy function of the first current observed roll;

[0022] Adjust the shifting amount of the first current observed roll to the limit shifting amount, adjust the bending roll force of the first current observed roll to 0, and adjust the bending roll forces and shifting amounts of the remaining rolls to 0;

[0023] Control the strip mill to perform rolling, and obtain the second deformation amount of the load bearing roll gap;

[0024] According to the second deformation amount, determine the original positive shifting limit shifting amount regulation efficacy function and the original negative shifting limit shifting amount regulation efficacy function of the first current observed roll;

[0025] The steps of obtaining the actual limit regulation efficacy function of each roll include:

[0026] In the case where the strip mill reaches a preset detection period, sequentially take each roll as the second current observed roll;

[0027] Adjust the bending roll force of the second current observed roll to the limit bending roll force, adjust the shifting amount of the second current observed roll to 0, and adjust the bending roll forces and shifting amounts of the remaining rolls to 0;

[0028] Control the strip rolling mill to perform rolling and obtain the third deformation amount of the bearing roll gap;

[0029] Determine the actual positive bending limit roll force regulation efficacy function and the actual negative bending limit roll force regulation efficacy function of the second current observation roll according to the third deformation amount;

[0030] Adjust the shift amount of the second current observation roll to the limit shift amount, adjust the roll force of the second current observation roll to 0, and adjust the roll forces and shift amounts of the remaining rolls to 0;

[0031] Control the strip rolling mill to perform rolling and obtain the fourth deformation amount of the bearing roll gap;

[0032] Determine the actual positive shift limit shift amount regulation efficacy function and the actual negative shift limit shift amount regulation efficacy function of the second current observation roll according to the fourth deformation amount.

[0033] In a feasible implementation manner, the steps of determining the offset information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function include:

[0034] Successively take each roll as the first current analysis roll;

[0035] Compare the actual positive shift limit shift amount regulation efficacy function of the first current analysis roll with the original positive shift limit shift amount regulation efficacy function, and compare the actual negative shift limit shift amount regulation efficacy function of the first current analysis roll with the original negative shift limit shift amount regulation efficacy function;

[0036] If, in the width direction of the strip, the actual positive shift limit shift amount regulation efficacy function of the first current analysis roll is less than the original positive shift limit shift amount regulation efficacy function, and the actual negative shift limit shift amount regulation efficacy function of the first current analysis roll is greater than the original negative shift limit shift amount regulation efficacy function, it is determined that the first current analysis roll has a roll offset phenomenon;

[0037] Determine the first difference between the actual positive shift limit shift amount regulation efficacy function and the original positive shift limit shift amount regulation efficacy function of the first current analysis roll, and determine the second difference between the actual negative shift limit shift amount regulation efficacy function and the original negative shift limit shift amount regulation efficacy function of the first current analysis roll;

[0038] Determine the average value of the first difference and the second difference;

[0039] Determine the offset amount of the first current analysis roll according to the average value and the first preset relationship.

[0040] In a feasible implementation manner, the steps of determining the offset information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function further include:

[0041] If, in the width direction of the strip, there is a situation where the actual positive limit roll shifting amount regulation efficacy function of the first current analysis roll is greater than or equal to the original positive limit roll shifting amount regulation efficacy function, and / or there is a situation where the actual negative limit roll shifting amount regulation efficacy function of the first current analysis roll is less than or equal to the original negative limit roll shifting amount regulation efficacy function, it is determined that there is no roll offset phenomenon for the first current analysis roll.

[0042] In a feasible implementation manner, the steps of determining the crossing information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function include:

[0043] Successively take each roll as the second current analysis roll;

[0044] Determine the third difference between the actual positive bending limit roll force regulation efficacy function and the original positive bending limit roll force regulation efficacy function of the second current analysis roll, and determine the fourth difference between the actual negative bending limit roll force regulation efficacy function and the original negative bending limit roll force regulation efficacy function of the second current analysis roll;

[0045] If there is a change in the third difference or the fourth difference in the width direction of the strip, it is determined that there is a roll crossing phenomenon for the second current analysis roll;

[0046] Determine the maximum difference position corresponding to the maximum value of the third difference or the fourth difference;

[0047] Determine the first difference of the third difference at the operating side boundary position of the second current analysis roll, and determine the second difference of the third difference at the drive side boundary position of the second current analysis roll;

[0048] Determine the third difference of the fourth difference at the operating side boundary position of the second current analysis roll, and determine the fourth difference of the fourth difference at the drive side boundary position of the second current analysis roll;

[0049] Determine the crossing angle of the second current analysis roll according to the maximum difference position, the first difference, the second difference, the third difference, the fourth difference, and the second preset relationship.

[0050] In a feasible implementation manner, the steps of determining the crossing information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function further include:

[0051] If the third difference and the fourth difference remain constant in the width direction of the strip, it is determined that there is no roll crossing phenomenon for the second current analysis roll.

[0052] According to the second aspect of the embodiments of the present application, a roll crossing and offset prediction device for a strip mill is proposed, including:

[0053] A first acquisition module, configured to acquire the original limit regulation efficacy functions of the respective rollers of the strip mill;

[0054] A second acquisition module, configured to acquire the actual limit regulation efficacy functions of the respective rollers;

[0055] A first determination module, configured to determine the offset information of the respective rollers according to the original limit regulation efficacy functions and the actual limit regulation efficacy functions;

[0056] A second determination module, configured to determine the crossing information of the respective rollers according to the original limit regulation efficacy functions and the actual limit regulation efficacy functions;

[0057] A generation module, configured to generate a roller offset warning message and a roller crossing warning message respectively according to the offset information and the crossing information.

[0058] According to a third aspect of the embodiments of the present application, a storage medium is proposed. The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the method proposed in any one of the first aspects above.

[0059] According to a fourth aspect of the embodiments of the present application, an electronic device is proposed. The electronic device includes at least one processor and at least one memory connected to the processor. Wherein, the processor is configured to call the program instructions in the memory to execute the method proposed in any one of the first aspects above.

[0060] Compared with the prior art, the present invention has at least the following beneficial effects: The roll crossing and offset prediction method for a strip rolling mill provided by the embodiments of the present application can understand the lateral distribution of the load-bearing roll gap deformation amount generated during rolling under the limit strip shape control amount and the strip shape control ability of each roll when the strip rolling mill is in the initial state by obtaining the original limit regulation efficacy function of each roll of the strip rolling mill, and the original limit regulation efficacy function of each roll can be used as a basic reference for subsequent analysis of whether there is roll crossing or roll offset for each roll; by obtaining the actual limit regulation efficacy function of each roll, it can be understood that when the strip rolling mill has performed a certain amount of strip rolling operations and reaches the preset detection period, the lateral distribution of the load-bearing roll gap deformation amount generated during rolling under the limit strip shape control amount and the strip shape control ability of each roll. Further combining the original limit regulation efficacy function of each roll for analysis, the offset information of each roll can be determined according to the original limit regulation efficacy function and the actual regulation efficacy function, and it can be judged whether there is a roll offset phenomenon for each roll after a certain amount of strip rolling operations. At the same time, the crossing information of each roll can be determined according to the original limit regulation efficacy function and the actual regulation efficacy function, and it can be judged whether there is a roll crossing phenomenon for each roll after a certain amount of strip rolling operations. Then, according to the offset information and the crossing information, a roll offset warning message and a roll crossing warning message are respectively generated to give corresponding prompts in a timely manner. The operators of the strip rolling mill can make targeted adjustments and maintenance to the strip rolling mill based on the offset situation and crossing situation of each roll, reduce the wear amount of the lining plate in the strip rolling mill, extend the service life of the strip rolling mill, improve the yield rate and reduce the production cost of the strip rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] By reading the following detailed description of the exemplary embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the exemplary embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0062] Figure 1 It is a schematic flow chart of a roll crossing and offset prediction method for a strip rolling mill according to an embodiment provided by the present application;

[0063] Figure 2 It is a schematic structural block diagram of a roll crossing and offset prediction device for a strip rolling mill according to an embodiment provided by the present application;

[0064] Figure 3 It is a schematic structural block diagram of an electronic device according to an embodiment provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0066] According to the first aspect of the embodiments of the present application, a method for predicting the roll crossing and offset of a strip mill is proposed. As Figure 1 shown, it includes:

[0067] Step S101: Obtain the original limit regulation efficacy functions of each roll of the strip mill;

[0068] Specifically, the original limit regulation efficacy functions of each roll are used to reflect the transverse distribution of the load-bearing roll gap deformation generated during rolling under the limit strip shape regulation amount when the strip mill is in the initial state.

[0069] Among them, the initial state refers to the state where the strip mill has undergone maintenance and has not yet performed rolling operations. It can be understood that after the strip mill has undergone maintenance, each roll in the mill will be in a relatively good working state, and there will usually be no obvious roll offset or roll crossing phenomenon. Therefore, the original limit regulation efficacy functions of each roll can be used as a basic reference for subsequent analysis of whether there is roll crossing or roll offset in each roll.

[0070] The strip shape regulation means usually include roll shifting and roll bending. The corresponding strip shape regulation amounts include the roll shifting amount and the roll bending force. The limit strip shape regulation amount refers to the maximum roll shifting amount and roll bending force that the strip mill can achieve.

[0071] The transverse distribution refers to the distribution in the width direction of the strip. There is a close relationship between the deformation of the load-bearing roll gap and the strip shape distribution. Therefore, when the strip mill is in the initial state, according to the limit strip shape regulation amount, each roll can be regulated accordingly and the strip can be rolled, and the transverse distribution of the strip shape of the rolled strip can be detected to obtain the transverse distribution of the load-bearing roll gap deformation amount. Furthermore, when the limit strip shape regulation amount is known, the original limit regulation efficacy functions of each roll can be obtained, and the strip shape regulation capabilities of each roll under the limit strip shape regulation amount when the strip mill is in the initial state can be understood by using the original limit regulation efficacy functions of each roll.

[0072] Step S102: Obtain the actual limit regulation efficacy functions of each roll;

[0073] Specifically, the actual limit regulation efficacy function of each roll is used to reflect the lateral distribution of the shape change amount of the load-bearing roll gap generated during rolling under the limit shape regulation amount of each roll when the strip mill has performed a certain amount of rolling operations and reached the preset detection period. After the strip mill has performed a certain amount of rolling operations, the shape regulation ability of each roll will change compared with the initial state, and correspondingly, it will be reflected as a change in the lateral distribution of the shape change amount of the load-bearing roll gap. Therefore, by obtaining the actual limit regulation efficacy function of each roll, it is possible to understand the lateral distribution of the shape change amount of the load-bearing roll gap generated during rolling under the limit shape regulation amount of each roll and the shape regulation ability of the strip mill after performing a certain amount of strip rolling operations.

[0074] It can be understood that the preset detection period can be set according to the production time interval, production shift interval, or production mileage interval of the strip mill. Specifically, it can be set in combination with the requirements for shape regulation accuracy and production needs, and there is no excessive limitation here.

[0075] Step S103: Determine the offset information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function;

[0076] Specifically, by combining and analyzing the actual limit regulation efficacy function of each roll with the original limit regulation efficacy function, the offset information of each roll can be determined based on the original limit regulation efficacy function and the actual regulation efficacy function, and it can be judged whether there is a roll offset phenomenon for each roll after performing a certain amount of strip rolling operations.

[0077] The offset information is used to reflect whether there is a roll offset phenomenon for each roll and the magnitude of the offset amount when there is a roll offset phenomenon.

[0078] Step S104: Determine the cross information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function;

[0079] Specifically, by combining and analyzing the actual limit regulation efficacy function of each roll with the original limit regulation efficacy function, the cross information of each roll can be determined based on the original limit regulation efficacy function and the actual regulation efficacy function, and it can be judged whether there is a roll cross phenomenon for each roll after performing a certain amount of strip rolling operations.

[0080] It should be noted that the cross information is used to reflect whether there is a roll cross phenomenon for each roll and the magnitude of the crossing angle when there is a roll cross phenomenon.

[0081] Step S105: Generate a roll offset warning message and a roll cross warning message respectively according to the offset information and the cross information.

[0082] Specifically, according to the offset information and the crossing information, the roll offset warning information and the roll crossing warning information are respectively generated to give corresponding prompts in a timely manner, facilitating the operators of the strip mill to timely understand the offset situation and the crossing situation of each roll.

[0083] In summary, the roll crossing and offset prediction method for a strip mill proposed in the first aspect of the embodiments of the present application can determine the offset information and the crossing information of each roll based on the original limit regulation efficacy function of each roll of the strip mill and in combination with the actual limit regulation efficacy function. Furthermore, it can timely detect the roll offset phenomenon and the roll crossing phenomenon generated by each roll during the production process, and further generate the roll offset warning information and the roll crossing warning information respectively according to the offset information and the crossing information to give corresponding prompts in a timely manner. The operators of the strip mill can make targeted adjustments and maintenance to the strip mill based on the offset situation and the crossing situation of each roll, reduce the wear amount of the lining plate in the strip mill, extend the service life of the strip mill, improve the qualified product rate and reduce the production cost of the strip mill.

[0084] In some examples, the original limit regulation efficacy function is the lateral distribution function of the load-bearing roll gap deformation amount generated when each roll is rolled under a single limit plate shape regulation amount when the strip mill is in the initial state;

[0085] The actual limit regulation efficacy function is the lateral distribution function of the load-bearing roll gap deformation amount generated when each roll is rolled under a single limit plate shape regulation amount when the strip mill reaches the preset detection period.

[0086] Specifically, the original limit regulation efficacy function f 0i (x) is the lateral distribution function of the load-bearing roll gap deformation amount generated when each roll is rolled under a single limit plate shape regulation amount when the strip mill is in the initial state. Among them, the limit plate shape regulation amount includes the limit bending roll force and the limit roll shifting amount. The state of the roll under a single limit plate shape regulation amount also means that the roll is only regulated by one of the limit regulation amounts.

[0087] The actual limit regulation efficacy function f 1i (x) is the lateral distribution function of the load-bearing roll gap deformation amount generated when each roll is rolled under a single limit plate shape regulation amount when the strip mill reaches the preset detection period.

[0088] Thus, the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x) of each roll can specifically reflect the lateral distribution situation of the load-bearing roll gap deformation amount of each roll under the corresponding limit plate shape regulation amount and exclude the interference of the other limit plate shape regulation amount, further facilitating the subsequent processing of the original limit regulation efficacy function f0i (x) and the specific analysis of the actual limit regulation efficacy function f 1i (x).

[0089] It should be noted that the function value of the original limit regulation efficacy function f 0i (x) is the bearing roll gap deformation generated by each roll during rolling under a single limit shape regulation amount when the strip mill is in the initial state, with the unit of mm; x is the position coordinate in the width direction of the strip, with the unit of mm. It can be understood that if the strip width is A and the midpoint in the width direction of the strip is taken as the coordinate origin, then the value range of x is [-A / 2, A / 2]; i is used to represent the type of shape regulation means. For example, if the shape regulation means is roll bending, then i is replaced by B, and if the shape regulation means is roll shifting, then i is replaced by S. The function value of the actual limit regulation efficacy function f 1i (x) is the bearing roll gap deformation generated by each roll during rolling under a single limit shape regulation amount when the strip mill reaches the preset detection period, with the unit of mm.

[0090] For example, for each roll, the original limit regulation efficacy function f 0i (x) includes the original limit roll bending force regulation efficacy function f 0B (x) and the original limit roll shifting amount regulation efficacy function f 0S (x). Considering that roll bending includes positive bending and negative bending, and roll shifting includes positive shifting and negative shifting, the original limit roll bending force regulation efficacy function f 0B (x) further includes the original positive bending limit roll bending force regulation efficacy function f +m0B (x) and the original negative bending limit roll bending force regulation efficacy function f -m0B (x). The original limit roll shifting amount regulation efficacy function f 0S (x) further includes the original positive shifting limit roll shifting amount regulation efficacy function f +m0S (x) and the original negative shifting limit roll shifting amount regulation efficacy function f -m0S (x).

[0091] Correspondingly, the actual limit regulation efficacy function includes the actual positive bending limit roll bending force regulation efficacy function f +m1B (x), the actual negative bending limit roll bending force regulation efficacy function f -m1B (x), the actual positive shifting limit roll shifting amount regulation efficacy function f +m1S (x) and the actual negative shifting limit roll shifting amount regulation efficacy function f -m1S (x).

[0092] It can be understood that the magnitudes of the limit roll bending forces for positive bending and negative bending are the same and their directions are opposite. Similarly, the magnitudes of the limit roll shifting amounts for positive shifting and negative shifting are the same and their directions are opposite.

[0093] Each roll of a strip mill generally includes a work roll, an intermediate roll, and a backup roll. Correspondingly, for each roll, the original limit regulation efficacy function f 0i (x) specifically includes: the original positive bending limit bending force regulation efficacy function f W+m0B (x) of the work roll, the original negative bending limit bending force regulation efficacy function f W-m0B (x) of the work roll, the original positive shifting limit shifting amount regulation efficacy function f W+m0S (x) of the work roll, the original negative shifting limit shifting amount regulation efficacy function f W-m0S (x) of the work roll, the original positive bending limit bending force regulation efficacy function f M+m0B (x) of the intermediate roll, the original negative bending limit bending force regulation efficacy function f M-m0B (x) of the intermediate roll, the original positive shifting limit shifting amount regulation efficacy function f M+m0S (x) of the intermediate roll, the original negative shifting limit shifting amount regulation efficacy function f M-m0S (x) of the intermediate roll, the original positive bending limit bending force regulation efficacy function f B+m0B (x) of the backup roll, the original negative bending limit bending force regulation efficacy function f B-m0B (x) of the backup roll, the original positive shifting limit shifting amount regulation efficacy function f B+m0S (x) of the backup roll, and the original negative shifting limit shifting amount regulation efficacy function f B-m0S (x) of the backup roll.

[0094] Correspondingly, the actual limit regulation efficacy function f 1i (x) specifically includes: the actual positive bending limit bending force regulation efficacy function f W+m1B (x) of the work roll, the actual negative bending limit bending force regulation efficacy function f W-m1B (x) of the work roll, the actual positive shifting limit shifting amount regulation efficacy function f W+m1S (x) of the work roll, the actual negative shifting limit shifting amount regulation efficacy function f W-m1S (x) of the work roll, the actual positive bending limit bending force regulation efficacy function f M+m1B (x) of the intermediate roll, the actual negative bending limit bending force regulation efficacy function f M-m1B (x) of the intermediate roll, the actual positive shifting limit shifting amount regulation efficacy function f M+m1S (x) of the intermediate roll, the actual negative shifting limit shifting amount regulation efficacy function f M-m1S (x) of the intermediate roll, the actual positive bending limit bending force regulation efficacy function f B+m1B (x) of the backup roll, the actual negative bending limit bending force regulation efficacy function f B-m1B (x) of the backup roll, the actual positive shifting limit shifting amount regulation efficacy function f B+m1S (x) of the backup roll, and the actual negative shifting limit shifting amount regulation efficacy function f B-m1S(x).

[0095] In some examples, the steps of obtaining the original limit regulation efficacy function f 0i (x) of each roll of the strip mill include:

[0096] When the strip mill is in the initial state, each roll is sequentially taken as the first current observed roll;

[0097] Adjust the bending force of the first current observed roll to the limit bending force, adjust the roll shifting amount of the first current observed roll to 0, and adjust the bending forces and roll shifting amounts of the remaining rolls to 0;

[0098] Control the strip mill to perform rolling, and obtain the first deformation amount of the bearing roll gap;

[0099] According to the first deformation amount, determine the original positive-bending limit bending force regulation efficacy function and the original negative-bending limit bending force regulation efficacy function of the first current observed roll;

[0100] Adjust the roll shifting amount of the first current observed roll to the limit roll shifting amount, adjust the bending force of the first current observed roll to 0, and adjust the bending forces and roll shifting amounts of the remaining rolls to 0;

[0101] Control the strip mill to perform rolling, and obtain the second deformation amount of the bearing roll gap;

[0102] According to the second deformation amount, determine the original positive-roll-shifting limit roll shifting amount regulation efficacy function and the original negative-roll-shifting limit roll shifting amount regulation efficacy function of the first current observed roll;

[0103] The steps of obtaining the actual limit regulation efficacy function f 1i (x) of each roll include:

[0104] When the strip mill reaches the preset detection period, each roll is sequentially taken as the second current observed roll;

[0105] Adjust the bending force of the second current observed roll to the limit bending force, adjust the roll shifting amount of the second current observed roll to 0, and adjust the bending forces and roll shifting amounts of the remaining rolls to 0;

[0106] Control the strip mill to perform rolling, and obtain the third deformation amount of the bearing roll gap;

[0107] According to the third deformation amount, determine the actual positive-bending limit bending force regulation efficacy function and the actual negative-bending limit bending force regulation efficacy function of the second current observed roll;

[0108] Adjust the roll shifting amount of the second current observed roll to the limit roll shifting amount, adjust the bending force of the second current observed roll to 0, and adjust the bending forces and roll shifting amounts of the remaining rolls to 0;

[0109] Control the strip mill to roll and obtain the fourth deformation of the bearing roll gap;

[0110] According to the fourth deformation, determine the actual positive limit roll shifting amount regulation efficacy function and the actual negative limit roll shifting amount regulation efficacy function of the second current observation roll.

[0111] Specifically, for the step of obtaining the original limit regulation efficacy function f 0i (x) of each roll of the strip mill, in order to obtain the lateral distribution of the bearing roll gap deformation generated during rolling under a single limit shape regulation amount when the strip mill is in the initial state, each observation roll can be successively used as the first current observation roll for relatively independent testing, so as to exclude the possible interference brought by the remaining rolls.

[0112] Further adjust the bending roll force of the first current observation roll to the limit bending roll force, and adjust the roll shifting amount of the first current observation roll to 0, so as to facilitate the testing of the bending roll regulation ability of the first current observation roll, exclude the interference of roll shifting regulation, and adjust the bending roll force and roll shifting amount of the remaining rolls to 0, that is, do not perform shape regulation on the remaining rolls to exclude the interference of the shape regulation of the remaining rolls during the testing of the first current observation roll.

[0113] It can be understood that the bending roll force application method of the first current observation roll is symmetric application, that is, the same bending roll force is applied to the drive side and the operating side of the first current observation roll.

[0114] Furthermore, control the strip mill to roll and obtain the first deformation of the bearing roll gap. The first deformation can be obtained based on the lateral distribution of the shape of the rolled strip, so that the original positive bending limit bending roll force regulation efficacy function and the original negative bending limit bending roll force regulation efficacy function of the first current observation roll can be obtained by combining the first deformation with the limit bending roll force.

[0115] It can be understood that when controlling the strip mill to roll, the direction of the limit bending roll force received by the first current observation roll can be further adjusted. Let the first current observation roll roll a certain amount of strip in the positive bending state to obtain the first deformation corresponding to the positive bending limit bending roll force, and then let the first current observation roll roll a certain amount of strip in the negative bending state to obtain the first deformation corresponding to the negative bending limit bending roll force. Then, based on the first deformation corresponding to the positive bending limit bending roll force and the first deformation corresponding to the negative bending limit bending roll force, respectively determine the original positive bending limit bending roll force regulation efficacy function and the original negative bending limit bending roll force regulation efficacy function of the first current observation roll.

[0116] Accordingly, adjust the shift amount of the first current observation roll to the limit shift amount, and adjust the roll bending force of the first current observation roll to 0, so as to facilitate the test of the shift control ability of the first current observation roll, exclude the interference of roll bending control, and adjust the roll bending force and shift amount of the remaining rolls to 0, that is, do not perform shape control on the remaining rolls, so as to exclude the interference of the shape control of the remaining rolls during the test of the first current observation roll.

[0117] It can be understood that the way of applying the shift amount of the first current observation roll is symmetric application, that is, the same shift amount is applied to the drive side and the operation side of the first current observation roll.

[0118] Furthermore, control the strip mill to carry out rolling, and obtain the second deformation amount of the load-bearing roll gap. The second deformation amount can be obtained based on the transverse distribution of the shape of the strip after rolling. Thus, based on the second deformation amount and the limit shift amount, the original positive shift limit shift amount control efficiency function and the original negative shift limit shift amount control efficiency function of the first current observation roll can be obtained.

[0119] It can be understood that when controlling the strip mill to carry out rolling, the direction of the limit shift amount received by the first current observation roll can be further adjusted. Let the first current observation roll roll a certain amount of strip in the positive shift state to obtain the second deformation amount corresponding to the positive shift limit shift amount. Then, let the first current observation roll roll a certain amount of strip in the negative shift state to obtain the second deformation amount corresponding to the negative shift limit shift amount. Furthermore, based on the second deformation amount corresponding to the positive shift limit shift amount and the second deformation amount corresponding to the negative shift limit shift amount, the original positive shift limit shift amount control efficiency function and the original negative shift limit shift amount control efficiency function of the first current observation roll are respectively determined.

[0120] Since each roll is successively used as the first current observation roll, after the original positive bending limit roll bending force control efficiency function, the original negative bending limit roll bending force control efficiency function, the original positive shift limit shift amount control efficiency function, and the original negative shift limit shift amount control efficiency function of a roll are determined, the remaining rolls can be successively used as the first current observation roll, and the foregoing process is repeated to realize the determination of the original limit control efficiency function f 0i (x).

[0121] For example, when the strip mill is in the initial state, the work roll of the strip mill can be first used as the first current observation roll, adjust the roll bending force of the work roll to the limit roll bending force, adjust the shift amount of the work roll to 0, and adjust the roll bending force and shift amount of the intermediate roll and the backup roll to 0; control the strip mill to carry out rolling, and obtain the first deformation amount of the load-bearing roll gap; according to the first deformation amount, determine the original positive bending limit roll bending force control efficiency function f W+m0B (x) and the original negative bending limit roll bending force control efficiency function fW-m0B (x); Adjust the shift amount of the work roll to the extreme shift amount, adjust the bending force of the work roll to 0, and adjust the bending force and shift amount of the intermediate roll and backup roll to 0; Control the strip mill to perform rolling, and obtain the second deformation amount of the bearing roll gap; According to the second deformation amount, determine the regulation efficacy function f of the original positive shift extreme shift amount of the work roll W+m0S (x) and the regulation efficacy function f of the original negative shift extreme shift amount of the work roll W-m0S (x).

[0122] Immediately, take the intermediate roll and backup roll as the first current observed roll one by one, and correspondingly execute the foregoing process to determine the regulation efficacy function f of the original positive bending extreme bending force of the intermediate roll M+m0B (x), the regulation efficacy function f of the original negative bending extreme bending force of the intermediate roll M-m0B (x) and the regulation efficacy function f of the original positive shift extreme shift amount of the intermediate roll M+m0S (x), the regulation efficacy function f of the original negative shift extreme shift amount of the intermediate roll M-m0S (x), the regulation efficacy function f of the original positive bending extreme bending force of the backup roll B+m0B (x), the regulation efficacy function f of the original negative bending extreme bending force of the backup roll B-m0B (x), the regulation efficacy function f of the original positive shift extreme shift amount of the backup roll B+m0S (x) and the regulation efficacy function f of the original negative shift extreme shift amount of the backup roll B-m0S (x), and realize the determination of the original limit regulation efficacy function f of each roll 0i (x).

[0123] It can be understood that the original regulation efficacy function of the intermediate roll or backup roll can also be determined first, and the specific determination order can be adjusted arbitrarily, and there is no excessive restriction here.

[0124] After the strip mill has performed a certain amount of rolling operations, the shape control ability of each roll will change compared with the initial state. In order to combine the original limit regulation efficacy function f of each roll 0i (x), analyze the cross and offset conditions of each roll, and give roll offset warnings and roll cross warnings in a timely manner, it is necessary to combine the preset detection period to obtain the actual limit regulation efficacy function f of each roll 1i (x).

[0125] Specifically, for obtaining the actual limit regulation efficacy function f of each roll 1i(x), in order to obtain the lateral distribution of the bearing roll gap deformation generated when each roll is rolled under a single limit flatness control amount when the preset detection period of the strip mill is reached, each observation roll can be sequentially used as the second current observation roll for relatively independent testing, so as to exclude the possible interference from the remaining rolls.

[0126] Further adjust the bending roll force of the second current observation roll to the limit bending roll force, and adjust the roll shifting amount of the second current observation roll to 0, so as to facilitate the testing of the bending roll control ability of the second current observation roll, exclude the interference of roll shifting control, and adjust the bending roll force and roll shifting amount of the remaining rolls to 0, that is, do not perform flatness control on the remaining rolls, so as to exclude the interference of the flatness control of the remaining rolls during the testing of the second current observation roll.

[0127] It can be understood that the bending roll force application method of the second current observation roll is symmetric application, that is, the same bending roll force is applied to the drive side and the operating side of the second current observation roll.

[0128] Furthermore, control the strip mill to perform rolling, and obtain the third deformation amount of the bearing roll gap. The third deformation amount can be obtained based on the lateral distribution of the flatness of the rolled strip, so that the actual positive bending limit bending roll force control efficiency function and the actual negative bending limit bending roll force control efficiency function of the second current observation roll can be obtained by combining the third deformation amount with the limit bending roll force.

[0129] It can be understood that when controlling the strip mill to perform rolling, the direction of the limit bending roll force applied to the second current observation roll can be further adjusted. Let the second current observation roll roll a certain amount of strip in the positive bending state to obtain the third deformation amount corresponding to the positive bending limit bending roll force, and then let the second current observation roll roll a certain amount of strip in the negative bending state to obtain the third deformation amount corresponding to the negative bending limit bending roll force. Then, based on the third deformation amount corresponding to the positive bending limit bending roll force and the third deformation amount corresponding to the negative bending limit bending roll force, the actual positive bending limit bending roll force control efficiency function and the actual negative bending limit bending roll force control efficiency function of the second current observation roll are respectively determined.

[0130] Correspondingly, adjust the roll shifting amount of the second current observation roll to the limit roll shifting amount, and adjust the bending roll force of the second current observation roll to 0, so as to facilitate the testing of the roll shifting control ability of the second current observation roll, exclude the interference of bending roll control, and adjust the bending roll force and roll shifting amount of the remaining rolls to 0, that is, do not perform flatness control on the remaining rolls, so as to exclude the interference of the flatness control of the remaining rolls during the testing of the second current observation roll.

[0131] It can be understood that the roll shifting amount application method of the second current observation roll is symmetric application, that is, the same roll shifting amount is applied to the drive side and the operating side of the second current observation roll.

[0132] Furthermore, control the strip mill to perform rolling and obtain the fourth deformation amount of the bearing roll gap. The fourth deformation amount can be obtained based on the transverse distribution of the strip shape after rolling. Thus, based on the fourth deformation amount and combined with the limit roll shifting amount, the actual positive roll shifting limit roll shifting amount regulation efficacy function and the actual negative roll shifting limit roll shifting amount regulation efficacy function of the second current observation roll can be obtained.

[0133] It can be understood that when controlling the plate mill to perform rolling, the direction of the limit roll shifting amount applied to the second current observation roll can be further adjusted. Let the second current observation roll roll a certain amount of strip in the positive roll shifting state to obtain the fourth deformation amount corresponding to the positive roll shifting limit roll shifting amount. Then, let the second current observation roll roll a certain amount of strip in the negative roll shifting state to obtain the fourth deformation amount corresponding to the negative roll shifting limit roll shifting amount. Furthermore, based on the fourth deformation amount corresponding to the positive roll shifting limit roll shifting amount and the fourth deformation amount corresponding to the negative roll shifting limit roll shifting amount, respectively determine the actual positive roll shifting limit roll shifting amount regulation efficacy function and the actual negative roll shifting limit roll shifting amount regulation efficacy function of the second current observation roll.

[0134] Since each roll serves as the second current observation roll in turn, after the actual positive bending limit bending force regulation efficacy function, the actual negative bending limit bending force regulation efficacy function, the actual positive roll shifting limit roll shifting amount regulation efficacy function, and the actual negative roll shifting limit roll shifting amount regulation efficacy function of a roll are determined, the remaining rolls can be successively made as the second current observation roll, repeating the foregoing process to realize the determination of the actual limit regulation efficacy function f 1i (x).

[0135] For example, when the strip mill reaches the preset detection period, the work roll of the strip mill can be first used as the second current observation roll. Adjust the bending force of the work roll to the limit bending force, adjust the roll shifting amount of the work roll to 0, and adjust the bending forces and roll shifting amounts of the intermediate roll and the backup roll to 0; control the strip mill to perform rolling and obtain the third deformation amount of the bearing roll gap; according to the third deformation amount, determine the actual positive bending limit bending force regulation efficacy function f W+m1B (x) and the actual negative bending limit bending force regulation efficacy function f W-m1B (x) of the work roll; adjust the roll shifting amount of the work roll to the limit roll shifting amount, adjust the bending force of the work roll to 0, and adjust the bending forces and roll shifting amounts of the intermediate roll and the backup roll to 0; control the strip mill to perform rolling and obtain the fourth deformation amount of the bearing roll gap; according to the fourth deformation amount, determine the actual positive roll shifting limit roll shifting amount regulation efficacy function f W+m1S (x) and the actual negative roll shifting limit roll shifting amount regulation efficacy function f W-m1S (x) of the work roll.

[0136] Subsequently, each intermediate roll and backup roll is taken as the second current observed roll, and the aforementioned process is correspondingly executed to determine the regulation efficacy function f of the actual positive bending limit roll force of the intermediate roll M+m1B (x), the regulation efficacy function f of the actual negative bending limit roll force of the intermediate roll M-m1B (x), the regulation efficacy function f of the actual positive shifting limit shifting amount of the intermediate roll M+m1S (x), the regulation efficacy function f of the actual negative shifting limit shifting amount of the intermediate roll M-m1S (x), the regulation efficacy function f of the actual positive bending limit roll force of the backup roll B+m1B (x), the regulation efficacy function f of the actual negative bending limit roll force of the backup roll B-m1B (x), the regulation efficacy function f of the actual positive shifting limit shifting amount of the backup roll B+m1S (x) and the regulation efficacy function f of the actual negative shifting limit shifting amount of the backup roll B-m1S (x).

[0137] It can be understood that the actual regulation efficacy function of the intermediate roll or backup roll can also be determined first, and the specific determination order can be adjusted arbitrarily, and no excessive restrictions are imposed here.

[0138] Generally speaking, the process of obtaining the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x) mainly involves taking the single limit shape regulation amount and the current observed roll as control variables, obtaining the deformation amount of the load-bearing roll gap generated during rolling under each limit shape regulation amount for each roll, and combining the corresponding limit shape regulation amount to obtain the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x) of each roll. Moreover, the strip rolled by the strip mill usually has high structural continuity. Therefore, after determining the original limit regulation efficacy function f 0i (x) of each roll, the shape regulation amount of each roll can be directly adjusted according to production requirements to carry out the rolling production of the strip. After the strip mill reaches the preset detection period, the shape regulation amount of each roll can be directly adjusted according to the aforementioned process to determine the actual limit regulation efficacy function f 1i (x) without stopping the strip mill, which greatly ensures the operation continuity of the strip mill and realizes the online acquisition of the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x).

[0139] In some examples, according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i(x), the steps of determining the offset information of each roll include:

[0140] Successively take each roll as the first current analysis roll;

[0141] Compare the actual forward limit roll shifting amount regulation efficacy function and the original forward limit roll shifting amount regulation efficacy function of the first current analysis roll, and compare the actual backward limit roll shifting amount regulation efficacy function and the original backward limit roll shifting amount regulation efficacy function of the first current analysis roll;

[0142] If, in the width direction of the strip, the actual forward limit roll shifting amount regulation efficacy function of the first current analysis roll is less than the original forward limit roll shifting amount regulation efficacy function, and the actual backward limit roll shifting amount regulation efficacy function of the first current analysis roll is greater than the original backward limit roll shifting amount regulation efficacy function, it is determined that there is a roll offset phenomenon for the first current analysis roll;

[0143] Determine the first difference between the actual forward limit roll shifting amount regulation efficacy function and the original forward limit roll shifting amount regulation efficacy function of the first current analysis roll, and determine the second difference between the actual backward limit roll shifting amount regulation efficacy function and the original backward limit roll shifting amount regulation efficacy function of the first current analysis roll;

[0144] Determine the average value of the first difference and the second difference;

[0145] Determine the offset amount of the first current analysis roll according to the average value and the first preset relationship.

[0146] Specifically, after obtaining the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x) of each roll, the offset information of each roll can be determined according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x).

[0147] In order to analyze the offset situation of each roll relatively independently, each roll can be successively taken as the first current analysis roll.

[0148] Furthermore, by comparing the actual forward limit roll shifting amount regulation efficacy function and the original forward limit roll shifting amount regulation efficacy function of the first current analysis roll, and comparing the actual backward limit roll shifting amount regulation efficacy function and its original backward limit roll shifting amount regulation efficacy function of the first current analysis roll, the magnitude relationship between the actual forward limit roll shifting amount regulation efficacy function and its original forward limit roll shifting amount regulation efficacy function of the first current analysis roll can be determined, and the magnitude relationship between the actual backward limit roll shifting amount regulation efficacy function and its original backward limit roll shifting amount regulation efficacy function of the first current analysis roll can be determined.

[0149] If, in the width direction of the strip, i.e., the x-direction, the actual forward limit roll shifting amount regulation efficacy function of the first current analysis roll is less than its original forward limit roll shifting amount regulation efficacy function, and the actual backward limit roll shifting amount regulation efficacy function of the first current analysis roll is greater than its original backward limit roll shifting amount regulation efficacy function, then it can be determined that there is a roll offset phenomenon for the roll.

[0150] Thus, in the case of determining that there is a roll offset phenomenon for the first current analysis roll, further determine the first difference between the actual forward limit roll shifting amount regulation efficacy function of the first current analysis roll and its original forward limit roll shifting amount regulation efficacy function, and determine the second difference between the actual backward limit roll shifting amount regulation efficacy function of the first current analysis roll and its original backward limit roll shifting amount regulation efficacy function. Then, calculate the average value of the first difference and the second difference. Further, in combination with the first preset relationship, determine the offset amount of each roll. Moreover, the comparison process of the functions, the determination process of the first difference, the second difference and the average value, as well as the determination process of the offset amount, can all be realized based on a computer device. Thus, when determining the offset amount, the operation of the strip mill will not be interrupted, further ensuring the operation continuity of the strip mill. And after determining the offset conditions of each roll, it can also provide a reliable reference for formulating the maintenance strategy of the strip mill.

[0151] It should be noted that the specific expression form of the first preset relationship is related to the type of the roll. The following will specifically illustrate with an example:

[0152] As mentioned above, each roll is usually divided into a work roll, an intermediate roll and a backup roll. In the step of determining the offset information of each roll according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x), the work roll, the intermediate roll and the backup roll can be successively used as the first current analysis roll.

[0153] In the case where the work roll is used as the first current analysis roll, compare the actual forward limit roll shifting amount regulation efficacy function f W+m1S (x) of the work roll with the original forward limit roll shifting amount regulation efficacy function f W+m0S (x) of the work roll, and compare the actual backward limit roll shifting amount regulation efficacy function f W-m1S (x) of the work roll with the original backward limit roll shifting amount regulation efficacy function f W-m0S (x);

[0154] If, in the width direction of the strip, the actual forward limit roll shifting amount regulation efficacy function f W+m1S (x) of the work roll is less than the original forward limit roll shifting amount regulation efficacy function f W+m0S(x), that is, within the strip width range [-A / 2, A / 2], at any x position, f W+m1S (x) < f W+m0S (x), and the regulating efficacy function f W-m1S (x) of the actual negative maximum shift amount of the work roll is greater than the regulating efficacy function f W-m0S (x) of the original negative maximum shift amount of the work roll, that is, within the strip width range [-A / 2, A / 2], at any x position, f W-m1S (x) > f W-m0S (x), then it is determined that there is a roll offset phenomenon in the work roll;

[0155] Determine the first difference between the regulating efficacy function f W+m1S (x) of the actual positive maximum shift amount of the work roll and the regulating efficacy function f W+m0S (x) of the original positive maximum shift amount of the work roll, and determine the second difference between the regulating efficacy function f W-m1S (x) of the actual negative maximum shift amount of the work roll and the regulating efficacy function f W-m0S (x) of the original negative maximum shift amount of the work roll;

[0156] Determine the mean value Δf of the first difference and the second difference of the work roll W ;

[0157] According to the mean value Δf W of the first difference and the second difference of the work roll and the first preset relationship, determine the offset amount s W of the work roll;

[0158] Among them, when the first current analysis roll is the work roll, the expression of the first preset relationship is as follows:

[0159]

[0160] In formula (1), the offset amount s W of the work roll has the unit of mm; R W is the radius of the work roll, with the unit of mm; the mean value Δf W of the first difference and the second difference of the work roll has the unit of mm.

[0161] Subsequently, take the intermediate roll and the backup roll as the first current analysis roll one by one, and correspondingly execute the foregoing process. When there is a roll offset phenomenon in the intermediate roll, the offset amount s M of the intermediate roll can be determined, and when there is a roll offset phenomenon in the backup roll, the offset amount s B of the backup roll can be determined.

[0162] Among them, when the first current analysis roll is the intermediate roll, the expression of the first preset relationship is as follows:

[0163]

[0164] In formula (2), the offset amount s of the intermediate roll M is in mm; R M is the radius of the intermediate roll, in mm; the average value Δf of the first difference and the second difference of the intermediate roll M is in mm.

[0165] When the first current analysis roll is a backup roll, the first preset relationship expression is as follows:

[0166]

[0167] In formula (3), the offset amount s of the backup roll B is in mm; R B is the radius of the backup roll, in mm; the average value Δf of the first difference and the second difference of the backup roll B is in mm.

[0168] In some examples, according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x), the steps of determining the offset information of each roll further include:

[0169] If, in the width direction of the strip, there is a situation where the actual positive skew limit roll shift regulation efficacy function of the first current analysis roll is greater than or equal to the original positive skew limit roll shift regulation efficacy function, and / or there is a situation where the actual negative skew limit roll shift regulation efficacy function of the first current analysis roll is less than or equal to the original negative skew limit roll shift regulation efficacy function, it is determined that there is no roll offset phenomenon for the first current analysis roll.

[0170] Specifically, if, in the width direction of the strip, there is a situation where the actual positive skew limit roll shift regulation efficacy function of the first current analysis roll is greater than its original positive skew limit roll shift regulation efficacy function, and / or there is a situation where the actual negative skew limit roll shift regulation efficacy function of the first current analysis roll is less than or equal to its original negative skew limit roll shift regulation efficacy function, it can be determined that there is no roll offset phenomenon for the first current analysis roll. Furthermore, it can be determined that the offset amount of the first current analysis roll is 0, and thus there is no need to correct the offset of the first current analysis roll.

[0171] In some examples, according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x), the steps of determining the crossing information of each roll include:

[0172] Successively take each roll as the second current analysis roll;

[0173] Determine the third difference between the actual positive bending limit roll force regulation efficacy function and the original positive bending limit roll force regulation efficacy function of the second current analysis roll, and determine the fourth difference between the actual negative bending limit roll force regulation efficacy function and the original negative bending limit roll force regulation efficacy function of the second current analysis roll;

[0174] If there is a change in the third difference or the fourth difference in the width direction of the strip, it is determined that there is a roll crossing phenomenon in the second current analysis roll;

[0175] Determine the maximum difference position corresponding to the maximum value of the third difference or the fourth difference;

[0176] Determine the first difference of the third difference at the operating side boundary position of the second current analysis roll, and determine the second difference of the third difference at the drive side boundary position of the second current analysis roll;

[0177] Determine the third difference of the fourth difference at the operating side boundary position of the second current analysis roll, and determine the fourth difference of the fourth difference at the drive side boundary position of the second current analysis roll;

[0178] Determine the crossing angle of the second current analysis roll according to the maximum difference position, the first difference, the second difference, the third difference, the fourth difference and the second preset relationship.

[0179] Specifically, after obtaining the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x) of each roll, the crossing information of each roll can be determined according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x).

[0180] In order to analyze the crossing situation of each roll relatively independently, each roll can be used as the second current analysis roll in turn.

[0181] Furthermore, determine the third difference between the actual positive bending limit roll force regulation efficacy function and the original positive bending limit roll force regulation efficacy function of the second current analysis roll, and determine the fourth difference between the actual negative bending limit roll force regulation efficacy function and the original negative bending limit roll force regulation efficacy function of the second current analysis roll, so as to obtain the lateral distribution of the third difference and the fourth difference.

[0182] If there is a change in the third difference or the fourth difference in the width direction of the strip, that is, the numerical value of the third difference or the fourth difference fluctuates, it can be determined that there is a roll crossing phenomenon in the second current analysis roll.

[0183] When it is determined that there is a roll crossing phenomenon in the second current analysis roll, the maximum difference position corresponding to the maximum value of the third difference or the maximum value of the fourth difference is further determined. The maximum difference position is also the position coordinate in the strip width direction corresponding to the maximum value of the third difference or the maximum value of the fourth difference.

[0184] Meanwhile, the first difference of the third difference at the operating side boundary position of the second current analysis roll is determined, and the second difference of the third difference at the drive side boundary position of the second current analysis roll is determined.

[0185] Among them, the operating side boundary position of the second current analysis roll refers to the width boundary position of the strip close to the operating side of the second current analysis roll. The first difference is also the value corresponding to the third difference at the operating side boundary position of the second current analysis roll. The drive side boundary position of the second current analysis roll refers to the width boundary position of the strip close to the drive side of the second current analysis roll. The second difference is also the value corresponding to the third difference at the drive side boundary position of the second current analysis roll.

[0186] And, the third difference of the fourth difference at the operating side boundary position of the second current analysis roll is determined, and the fourth difference of the fourth difference at the drive side boundary position of the second current analysis roll is determined.

[0187] Among them, the third difference is the value corresponding to the fourth difference at the operating side boundary position of the second current analysis roll. The fourth difference is also the value corresponding to the fourth difference at the drive side boundary position of the second current analysis roll.

[0188] Furthermore, based on the maximum difference position, the first difference, the second difference, the third difference, the fourth difference and the second preset relationship, the crossing angle of the second current analysis roll can be determined. At the same time, it can be determined that the maximum difference position is the crossing point of the second current analysis roll. And the determination processes of the third difference and the fourth difference, the determination processes of the first difference to the fourth difference, and the determination process of the crossing angle can all be realized based on a computer device, so that the operation of the strip mill will not be interrupted when determining the crossing angle, further ensuring the operation continuity of the strip mill. And after determining the crossing conditions of each roll, it can also provide a reliable reference for formulating the maintenance strategy of the strip mill.

[0189] It should be noted that the specific expression form of the second preset relationship is related to the type of the roll. The following is a specific example for illustration:

[0190] In the step of determining the crossing information of each roll according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x), the work roll, the intermediate roll and the backup roll can be sequentially used as the second current analysis roll.

[0191] When the work roll is used as the second current analysis roll, determine the actual positive bending limit roll force regulation efficacy function f W+m1B (x) of the work roll and the third difference between the actual positive bending limit roll force regulation efficacy function f W+m0B (x) of the work roll and the original positive bending limit roll force regulation efficacy function f W-m1B (x), and determine the actual negative bending limit roll force regulation efficacy function f W-m0B (x) of the second current analysis roll and the fourth difference between the original negative bending limit roll force regulation efficacy function f

[0192] If there is a change in the third difference or the fourth difference in the width direction of the strip, it is determined that there is a roll crossing phenomenon in the work roll;

[0193] Determine the maximum difference position x corresponding to the third difference or the fourth difference of the work roll maxW ;

[0194] Determine the first difference Δf of the third difference of the work roll at the operation side boundary position of the work roll W+EC , and determine the second difference Δf of the third difference of the work roll at the drive side boundary position of the work roll W+ED ;

[0195] Determine the third difference Δf of the fourth difference of the work roll at the operation side boundary position of the work roll W-EC , and determine the fourth difference Δf of the fourth difference of the work roll at the drive side boundary position of the work roll W-ED ;

[0196] According to the maximum difference position x corresponding to the third difference or the fourth difference of the work roll maxW , the first difference Δf of the third difference of the work roll at the operation side boundary position of the work roll W+EC , the second difference Δf of the third difference of the work roll at the drive side boundary position of the work roll W+ED , the third difference Δf of the fourth difference of the work roll at the operation side boundary position of the work roll W-EC , the fourth difference Δf of the fourth difference of the work roll at the drive side boundary position of the work roll W-ED and the second preset relationship, determine the crossing angle θ of the work roll W .

[0197] Among them, when the second current analysis roll is the work roll, the expression of the second preset relationship is as follows:

[0198]

[0199] In formula (4), the crossing angle θ of the work roll W The unit is °; the first difference Δf of the third difference of the work roll at the operation side boundary position of the work rollW+EC The second difference Δf of the third difference value of the work roll at the boundary position on the drive side of the work roll W+ED The third difference Δf of the fourth difference value of the work roll at the boundary position on the operating side of the work roll W-EC and the fourth difference Δf of the fourth difference value of the work roll at the boundary position on the drive side of the work roll W-ED The unit is mm; L W is the length of the work roll, and the unit is mm.

[0200] Subsequently, each intermediate roll and backup roll is taken as the second current analysis roll, and the aforementioned process is correspondingly executed. When there is a roll crossing phenomenon in the intermediate roll, the crossing angle θ of the intermediate roll is determined M , and when there is a roll crossing phenomenon in the backup roll, the crossing angle θ of the backup roll is determined B .

[0201] Among them, when the second current analysis roll is the intermediate roll, the expression of the second preset relationship is as follows:

[0202]

[0203] In Equation (5), the crossing angle θ of the intermediate roll M The unit is °; the first difference Δf of the third difference value of the intermediate roll at the boundary position on the operating side of the intermediate roll M+EC the second difference Δf of the third difference value of the intermediate roll at the boundary position on the drive side of the intermediate roll M+ED the third difference Δf of the fourth difference value of the intermediate roll at the boundary position on the operating side of the intermediate roll M-EC and the fourth difference Δf of the fourth difference value of the intermediate roll at the boundary position on the drive side of the intermediate roll M-ED The unit is all mm; x maxM is the maximum difference position corresponding to the third difference value or the fourth difference value of the intermediate roll; L M is the length of the intermediate roll, and the unit is mm.

[0204] When the second current analysis roll is the backup roll, the expression of the second preset relationship is as follows:

[0205]

[0206] In Equation (6), the crossing angle θ of the backup roll B The unit is °; the first difference Δf of the third difference value of the backup roll at the boundary position on the operating side of the backup roll B+EC the second difference Δf of the third difference value of the backup roll at the boundary position on the drive side of the backup roll B+ED the third difference Δf of the fourth difference value of the backup roll at the boundary position on the operating side of the backup roll B-EC and the fourth difference Δf of the fourth difference value of the backup roll at the boundary position on the drive side of the backup rollB-ED The unit is mm; x maxB is the maximum difference position corresponding to the third difference or the fourth difference of the backup roll; L B is the length of the backup roll, with the unit of mm.

[0207] In some examples, according to the original limit regulation efficacy function f 0i (x) and the actual limit regulation efficacy function f 1i (x), the steps of determining the crossing information of each roll further include:

[0208] If the third difference and the fourth difference remain constant in the width direction of the strip, it is determined that there is no roll crossing phenomenon in the second current analysis roll.

[0209] Specifically, if the third difference and the fourth difference remain constant in the width direction of the strip, that is, the values of the third difference and the fourth difference do not fluctuate, it can be determined that there is no roll crossing phenomenon in the first current analysis roll. Furthermore, it can be determined that the crossing angle of the second current analysis roll is 0, and thus there is no need to correct the crossing of the second current analysis roll.

[0210] As a specific example of the roll crossing offset prediction method for a strip mill proposed in the first aspect above, the actual process of the roll crossing offset prediction method for a strip mill can be as follows, including:

[0211] Step S1: Extract the original limit regulation efficacy function f 0i (x) of each shape control means.

[0212] Specifically, for comparing the regulation efficacy before and after roll crossing and offset detection, it is necessary to extract in advance the shape control efficacy corresponding to the bending roll and shifting roll control means of the work roll, intermediate roll, and backup roll.

[0213] The original limit regulation efficacy function f 0i (x) is the transverse distribution function of the bearing roll gap opening generated during the rolling of a flat strip under the limit bending roll force or limit shifting roll amount of each roll, that is, the work roll original positive bending limit bending roll force regulation efficacy function f W+m0B (x), the work roll original negative bending limit bending roll force regulation efficacy function f W-m0B (x), the work roll original positive shifting limit shifting roll amount regulation efficacy function f W+m0S (x), the work roll original negative shifting limit shifting roll amount regulation efficacy function f W-m0S (x), the intermediate roll original positive bending limit bending roll force regulation efficacy function f M+m0B (x), the intermediate roll original negative bending limit bending roll force regulation efficacy function f M-m0B (x), the intermediate roll original positive shifting limit shifting roll amount regulation efficacy function f M+m0S(x), the regulating efficacy function f of the original negative shifting limit shifting amount of the intermediate roll M-m0S (x), the regulating efficacy function f of the original positive bending limit bending force of the backup roll B+m0B (x), the regulating efficacy function f of the original negative bending limit bending force of the backup roll B-m0B (x), the regulating efficacy function f of the original positive shifting limit shifting amount of the backup roll B+m0S (x) and the regulating efficacy function f of the original negative shifting limit shifting amount of the backup roll B-m0S (x).

[0214] Step S2: Preset the symmetric regulating amounts of the shape control devices on the operator side and the drive side, and extract the corresponding loaded roll gap deformation amounts.

[0215] Specifically, when performing the on-line detection of roll crossing and offset, the same shape control amounts need to be applied to the shape control devices arranged on both the operator side and the drive side, such as the bending force and shifting amount with the same direction and value, and extract the numerical values of the bending force and shifting amount.

[0216] Meanwhile, after the shape control amounts are preset, extract the shape change amount from the position of the shape meter on the exit side of the strip mill, and further obtain the corresponding loaded roll gap deformation amounts of this group of shape control amounts.

[0217] Step S3: Extract the actual limit regulating efficacy function f of each shape control means i (x).

[0218] Specifically, preset the change of a single shape control amount respectively, and keep the other shape control amounts unchanged, and extract the actual shape control efficacy function corresponding to each shape control amount. That is, change the bending forces on the operator side and the drive side of the work roll, and keep the shifting amount of the work roll, the bending forces and shifting amounts of other rolls all zero, extract the actual shape control efficacy function of the work roll, and further extract the corresponding regulating efficacy function f of the actual positive bending limit bending force of the work roll W+m1B (x). Further, the regulating efficacy function f of the actual negative bending limit bending force of the work roll can be obtained W-m1B (x), the regulating efficacy function f of the actual positive shifting limit shifting amount of the work roll W+m1S (x), the regulating efficacy function f of the actual negative shifting limit shifting amount of the work roll W-m1S (x), the regulating efficacy function f of the actual positive bending limit bending force of the intermediate roll M+m1B (x), the regulating efficacy function f of the actual negative bending limit bending force of the intermediate roll M-m1B (x), the regulating efficacy function f of the actual positive shifting limit shifting amount of the intermediate roll M+m1S (x), the regulating efficacy function f of the actual negative shifting limit shifting amount of the intermediate roll M-m1S (x), the regulating efficacy function f of the actual positive bending limit bending force of the backup roll B+m1B(x), the regulating efficacy function f of the actual negative bending limit roll force of the backup roll B-m1B (x), the regulating efficacy function f of the actual positive shifting limit shifting amount of the backup roll B+m1S (x) and the regulating efficacy function f of the actual negative shifting limit shifting amount of the backup roll B-m1S (x).

[0219] Step S4: Compare the current strip shape regulating efficacy function with the original limit regulating efficacy function, and distinguish the patterns of roll crossing and roll offset.

[0220] Specifically, step S4 includes:

[0221] Step S41: Analyze the range position and overall attenuation degree of the regulating efficacy function of roll shifting.

[0222] Specifically, if for any x value, f W+m1S (x) is less than f W+m0S (x), and f W-m1S (x) is greater than f W-m0S (x), then at this time, the work roll has roll offset, and its offset amount s W can be calculated by formula (1).

[0223] If for any x value, f M+m1S (x) is less than f M+m0S (x), while f M-m1S (x) is greater than f M-m0S (x), then at this time, the intermediate roll has roll offset, and its offset amount s M can be calculated by formula (2).

[0224] If for any x value, f B+m1S (x) is less than f B+m0S (x), while f B-m1S (x) is greater than f B-m0S (x), then at this time, the backup roll has roll offset, and its offset amount s B can be calculated by formula (3).

[0225] Step S42: Analyze the range position and overall attenuation degree of the regulating efficacy function of roll bending.

[0226] Specifically, calculate the difference between the limit roll bending regulating efficacy function and the corresponding actual roll bending regulating efficacy function of each roll during the process of x changing from the operator side to the drive side. If this difference is axially equal for each roll, there is no roll crossing problem, and at this time, the difference in the roll bending regulating efficacy is caused by roll offset. If this difference changes axially for each roll, calculate the position x max .

[0227] If x maxIf it appears on the work roll, calculate the regulation efficacy function \(f\) of the actual positive-bending limit roll force of the work roll in the positive-bending state W+m1B (x) and the regulation efficacy difference \(\Delta f\) of the regulation efficacy function \(f\) of the original positive-bending limit roll force of the work roll W+m0B (x) at the operation side boundary position W+EC , and the regulation efficacy difference \(\Delta f\) at the drive side boundary position W+ED ; calculate the regulation efficacy function \(f\) of the actual negative-bending limit roll force of the work roll in the negative-bending state W-m1B (x) and the regulation efficacy difference \(\Delta f\) of the regulation efficacy function \(f\) of the original negative-bending limit roll force of the work roll W-m0B (x) at the operation side boundary position W-EC , and the regulation efficacy difference \(\Delta f\) at the drive side boundary position W-ED , denote \(x\) max as \(x\) maxW , the intersection point is \(x\) maxW , and its intersection angle \(\theta\) W can be calculated by Equation (4).

[0228] If \(x\) max appears on the intermediate roll, calculate the regulation efficacy function \(f\) of the actual positive-bending limit roll force of the intermediate roll in the positive-bending state M+m1B (x) and the regulation efficacy difference \(\Delta f\) of the regulation efficacy function \(f\) of the original positive-bending limit roll force of the intermediate roll M+m0B (x) at the operation side boundary position M+EC , and the regulation efficacy difference \(\Delta f\) at the drive side boundary position M+ED ; calculate the regulation efficacy function \(f\) of the actual negative-bending limit roll force of the intermediate roll in the negative-bending state M-m1B (x) and the regulation efficacy difference \(\Delta f\) of the regulation efficacy function \(f\) of the original negative-bending limit roll force of the intermediate roll M-m0B (x) at the operation side boundary position M-EC , and the regulation efficacy difference \(\Delta f\) at the drive side boundary position M-ED , denote \(x\) max as \(x\) maxM , the intersection point is \(x\) maxM , and its intersection angle \(\theta\) M can be calculated by Equation (5).

[0229] If \(x\) max appears on the backup roll, calculate the regulation efficacy function \(f\) of the actual positive-bending limit roll force of the backup roll in the positive-bending state B+m1B (x) and the regulation efficacy difference \(\Delta f\) of the regulation efficacy function \(f\) of the original positive-bending limit roll force of the backup roll B+m0B (x) at the backup side boundary position B+EC , and the regulation efficacy difference \(\Delta f\) at the backup side boundary position B+ED; Calculate the regulation efficacy function \(f\) of the actual negative bending limit roll force of the backup roll in the negative bending state B-m1B (x) and the regulation efficacy function \(f\) of the original negative bending limit roll force of the backup roll B-m0B (x), and calculate the difference \(\Delta f\) in regulation efficacy at the operating side boundary position B-EC , as well as the difference \(\Delta f\) in regulation efficacy at the drive side boundary position B-ED . Denote \(x\) max as \(x\) maxB , and the intersection point is \(x\) maxB , and its intersection angle \(\theta\) B can be calculated by Equation (6).

[0230] According to the second aspect of the embodiments of the present application, a roll crossing and offset prediction device for a strip rolling mill is proposed. As Figure 2 shown, it includes:

[0231] The first acquisition module 201 is configured to acquire the original limit regulation efficacy function of each roll of the strip rolling mill;

[0232] The second acquisition module 202 is configured to acquire the actual limit regulation efficacy function of each roll;

[0233] The first determination module 203 is configured to determine the offset information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function;

[0234] The second determination module 204 is configured to determine the crossing information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function;

[0235] The generation module 205 is configured to generate a roll offset warning message and a roll crossing warning message respectively according to the offset information and the crossing information.

[0236] The roll crossing and offset prediction device for a strip rolling mill proposed in the second aspect of the embodiments of the present application can determine the offset information and crossing information of each roll based on the original limit regulation efficacy function of each roll of the strip rolling mill and in combination with the actual limit regulation efficacy function, and thus can timely detect the roll offset phenomenon and roll crossing phenomenon generated by each roll during the production process. Further, according to the offset information and the crossing information, a roll offset warning message and a roll crossing warning message are generated respectively to give corresponding prompts in a timely manner. The operators of the strip rolling mill can perform targeted adjustment and maintenance on the strip rolling mill based on the offset situation and crossing situation of each roll, reduce the wear amount of the lining plate in the strip rolling mill, extend the service life of the strip rolling mill, improve the yield rate and reduce the production cost of the strip rolling mill.

[0237] In some feasible examples, the original limit regulation efficacy function is the lateral distribution function of the bearing roll gap deformation amount generated when each roll is rolled under a single limit shape regulation amount in the case where the strip rolling mill is in the initial state;

[0238] The actual limit regulation efficacy function is the lateral distribution function of the bearing roll gap deformation amount generated when each roll is rolled under a single limit shape regulation amount in the case where the strip rolling mill reaches the preset detection period.

[0239] In some feasible examples, the first acquisition module 201 includes:

[0240] The first processing unit is used to sequentially take each roll as the first current observation roll in the case where the strip rolling mill is in the initial state;

[0241] The first adjustment unit is used to adjust the bending roll force of the first current observation roll to the limit bending roll force, adjust the shifting amount of the first current observation roll to 0, and adjust the bending roll forces and shifting amounts of the remaining rolls to 0;

[0242] The first acquisition unit is used to control the strip rolling mill to perform rolling and acquire the first deformation amount of the bearing roll gap;

[0243] The first determination unit is used to determine the original positive-bending limit bending roll force regulation efficacy function and the original negative-bending limit bending roll force regulation efficacy function of the first current observation roll according to the first deformation amount;

[0244] The second adjustment unit is used to adjust the shifting amount of the first current observation roll to the limit shifting amount, adjust the bending roll force of the first current observation roll to 0, and adjust the bending roll forces and shifting amounts of the remaining rolls to 0;

[0245] The second acquisition unit is used to control the strip rolling mill to perform rolling and acquire the second deformation amount of the bearing roll gap;

[0246] The second determination unit is used to determine the original positive-shifting limit shifting amount regulation efficacy function and the original negative-shifting limit shifting amount regulation efficacy function of the first current observation roll according to the second deformation amount;

[0247] The second acquisition module 202 includes:

[0248] The second processing unit is used to sequentially take each as the second current observation roll in the case where the strip rolling mill reaches the preset detection period;

[0249] The third adjustment unit is used to adjust the bending roll force of the second current observation roll to the limit bending roll force, adjust the shifting amount of the second current observation roll to 0, and adjust the bending roll forces and shifting amounts of the remaining rolls to 0;

[0250] A third acquisition unit, configured to control a plate and strip rolling mill to perform rolling, and acquire a third deformation amount of a bearing roll gap;

[0251] A third determination unit, configured to determine an actual positive bending limit roll force regulation efficacy function and an actual negative bending limit roll force regulation efficacy function of a second currently observed roll according to the third deformation amount;

[0252] A fourth adjustment unit, configured to adjust the shift amount of the second currently observed roll to a limit shift amount, adjust the roll force of the second currently observed roll to 0, and adjust the roll forces and shift amounts of the remaining rolls to 0;

[0253] A fourth acquisition unit, configured to control a plate and strip rolling mill to perform rolling, and acquire a fourth deformation amount of a bearing roll gap;

[0254] A fourth determination unit, configured to determine an actual positive shift limit shift amount regulation efficacy function and an actual negative shift limit shift amount regulation efficacy function of a second currently observed roll according to the fourth deformation amount.

[0255] In some feasible examples, the first determination module 203 includes:

[0256] A third processing unit, configured to sequentially use each roll as a first currently analyzed roll;

[0257] A first comparison unit, configured to compare an actual positive shift limit shift amount regulation efficacy function and an original positive shift limit shift amount regulation efficacy function of the first currently analyzed roll, and compare an actual negative shift limit shift amount regulation efficacy function and an original negative shift limit shift amount regulation efficacy function of the first currently analyzed roll;

[0258] A fifth determination unit, configured to determine that there is a roll offset phenomenon of the first currently analyzed roll if, in the width direction of the plate and strip, the actual positive shift limit shift amount regulation efficacy function of the first currently analyzed roll is less than the original positive shift limit shift amount regulation efficacy function, and the actual negative shift limit shift amount regulation efficacy function of the first currently analyzed roll is greater than the original negative shift limit shift amount regulation efficacy function;

[0259] A sixth determination unit, configured to determine a first difference between the actual positive shift limit shift amount regulation efficacy function and the original positive shift limit shift amount regulation efficacy function of the first currently analyzed roll, and determine a second difference between the actual negative shift limit shift amount regulation efficacy function and the original negative shift limit shift amount regulation efficacy function of the first currently analyzed roll;

[0260] A seventh determination unit, configured to determine an average value of the first difference and the second difference;

[0261] An eighth determination unit, configured to determine an offset amount of the first currently analyzed roll according to the average value and a first preset relationship.

[0262] In some feasible examples, the first determination module 203 further includes:

[0263] A ninth determination unit, configured to determine that there is no roll offset phenomenon of the first current analysis roll if, in the width direction of the strip, there is a situation where the actual positive limit roll shifting amount regulation efficacy function of the first current analysis roll is greater than or equal to the original positive limit roll shifting amount regulation efficacy function, and / or there is a situation where the actual negative limit roll shifting amount regulation efficacy function of the first current analysis roll is less than or equal to the original negative limit roll shifting amount regulation efficacy function.

[0264] In some feasible examples, the second determination module 204 includes:

[0265] A fourth processing unit, configured to sequentially use each roll as the second current analysis roll;

[0266] A tenth determination unit, configured to determine a third difference between the actual positive bending limit roll force regulation efficacy function and the original positive bending limit roll force regulation efficacy function of the second current analysis roll, and determine a fourth difference between the actual negative bending limit roll force regulation efficacy function and the original negative bending limit roll force regulation efficacy function of the second current analysis roll;

[0267] An eleventh determination unit, configured to determine that there is a roll crossing phenomenon of the second current analysis roll if, in the width direction of the strip, the third difference or the fourth difference changes;

[0268] A twelfth determination unit, configured to determine the maximum difference position corresponding to the maximum value of the third difference or the fourth difference;

[0269] A thirteenth determination unit, configured to determine a first difference amount of the third difference at the operating side boundary position of the second current analysis roll, and determine a second difference amount of the third difference at the drive side boundary position of the second current analysis roll;

[0270] A fourteenth determination unit, configured to determine a third difference amount of the fourth difference at the operating side boundary position of the second current analysis roll, and determine a fourth difference amount of the fourth difference at the drive side boundary position of the second current analysis roll;

[0271] A fifteenth determination unit, configured to determine the crossing angle of the second current analysis roll according to the maximum difference position, the first difference amount, the second difference amount, the third difference amount, the fourth difference amount, and the second preset relationship.

[0272] In some feasible examples, the second determination module 204 further includes:

[0273] A sixteenth determination unit, configured to determine that there is no roll crossing phenomenon of the second current analysis roll if, in the width direction of the strip, the third difference and the fourth difference remain constant.

[0274] According to a third aspect of the embodiments of the present application, a storage medium is provided. The storage medium includes a stored program, and when the program runs, it controls the device where the storage medium is located to execute the method provided in any one of the above first aspects.

[0275] According to a fourth aspect of the embodiments of the present application, an electronic device 300 is provided. As Figure 3 shown, the electronic device 300 includes at least one processor 301 and at least one memory 302 connected to the processor 301. The processor 301 is configured to call program instructions in the memory 302 to execute the method provided in any one of the above first aspects.

[0276] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses, and electronic devices according to the embodiments of the present application. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable process management devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable process management devices generate means for implementing the functions specified in one Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0277] In the above embodiments, the descriptions of the various embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0278] In the several embodiments provided by the present application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the above division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces. The indirect coupling or communication connection of the apparatus or unit can be in an electrical or other form.

[0279] In a typical configuration, an electronic device may include one or more processors (CPUs), a memory, and a bus; the electronic device may also include an input / output interface, a network interface, etc.

[0280] The memory may include non - permanent memory in the form of computer - readable media, such as random access memory (RAM) and / or non - volatile memory, such as read - only memory (ROM) or flash RAM. The memory includes at least one memory chip; the memory is an example of a storage medium.

[0281] Storage media include permanent and non - permanent, removable and non - removable media, and information storage can be implemented by any method or technology; the information can be computer - readable instructions, data structures, program modules, or other data; examples of computer storage media include, but are not limited to, phase - change memory (PRAM), static random - access memory (SRAM), dynamic random - access memory (DRAM), other types of random - access memory (RAM), read - only memory (ROM), electrically erasable programmable read - only memory (EEPROM), flash memory or other memory technologies, compact disc read - only memory (CD - ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non - transitory medium that can be used to store information accessible by a computing device; as defined herein, storage media do not include transitory computer - readable media, such as modulated data signals and carrier waves.

[0282] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims, and drawings of this application are used to distinguish similar objects and do not necessarily describe a particular order or sequence; it should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0283] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps may be able to be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0284] It should also be noted that the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device; without further limitation, an element defined by the statement "comprising one..." does not preclude the existence of additional identical elements in the process, method, commodity or device comprising the element.

[0285] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, apparatus or electronic device; therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects; moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0286] The computer program code for performing the operations of the embodiments of the present application can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Common Lisp, Python, C++, Objective-C, Smalltalk, Delphi, Java, Swift, C#, Perl, Ruby, JavaScript and PHP, etc., and also include conventional procedural programming languages such as Fortran, ALGOL, COBOL, PL / I, BASIC, Pascal and C, etc., and further include any other programming language such as Lisp, Tcl, Prolog, VisualBasic.NET, SQL and R, etc.; the program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server; in the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., by using an Internet service provider to connect through the Internet).

[0287] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the scope of the claims of the present application.

Claims

1. A prediction method for roll crossing and offset of a strip rolling mill, characterized in that Including: Obtaining the original limit regulation efficacy functions of each roll of the strip mill; Obtaining the actual limit regulation efficacy functions of each of the rolls; Determining the offset information of each of the rolls according to the original limit regulation efficacy function and the actual limit regulation efficacy function; Determining the crossover information of each of the rolls according to the original limit regulation efficacy function and the actual limit regulation efficacy function; Generating a roll offset warning message and a roll crossover warning message respectively according to the offset information and the crossover information; The original limit regulation efficacy function is the lateral distribution function of the load roll gap deformation generated by each roll during rolling under a single limit shape regulation amount when the strip mill is in an initial state; The actual limit regulation efficacy function is the lateral distribution function of the load roll gap deformation generated by each roll during rolling under a single limit shape regulation amount when the strip mill reaches a preset detection period; The step of obtaining the original limit regulation efficacy functions of each roll of the strip mill includes: When the strip mill is in the initial state, successively taking each of the rolls as the first current observation roll; Adjusting the bending roll force of the first current observation roll to the limit bending roll force, adjusting the roll shifting amount of the first current observation roll to 0, and adjusting the bending roll forces and roll shifting amounts of the remaining rolls to 0; Controlling the strip mill to perform rolling and obtaining the first deformation amount of the load roll gap; Determining the original positive bending limit bending roll force regulation efficacy function and the original negative bending limit bending roll force regulation efficacy function of the first current observation roll according to the first deformation amount; Adjusting the roll shifting amount of the first current observation roll to the limit roll shifting amount, adjusting the bending roll force of the first current observation roll to 0, and adjusting the bending roll forces and roll shifting amounts of the remaining rolls to 0; Controlling the strip mill to perform rolling and obtaining the second deformation amount of the load roll gap; Determining the original positive roll shifting limit roll shifting amount regulation efficacy function and the original negative roll shifting limit roll shifting amount regulation efficacy function of the first current observation roll according to the second deformation amount; The step of obtaining the actual limit regulation efficacy functions of each of the rolls includes: When the strip mill reaches the preset detection period, successively taking each of the rolls as the second current observation roll; Adjusting the bending roll force of the second current observation roll to the limit bending roll force, adjusting the roll shifting amount of the second current observation roll to 0, and adjusting the bending roll forces and roll shifting amounts of the remaining rolls to 0; Controlling the strip mill to perform rolling and obtaining the third deformation amount of the load roll gap; Determining the actual positive bending limit bending roll force regulation efficacy function and the actual negative bending limit bending roll force regulation efficacy function of the second current observation roll according to the third deformation amount; Adjusting the roll shifting amount of the second current observation roll to the limit roll shifting amount, adjusting the bending roll force of the second current observation roll to 0, and adjusting the bending roll forces and roll shifting amounts of the remaining rolls to 0; Controlling the strip mill to perform rolling and obtaining the fourth deformation amount of the load roll gap; Based on the fourth deformation amount, determine the actual forward limit roll shifting amount regulation efficacy function and the actual backward limit roll shifting amount regulation efficacy function of the second current observation roll.

2. The roll crossing and offset prediction method for a strip mill according to claim 1, characterized in that, The step of determining the offset information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function includes: Successively take each roll as the first current analysis roll; Compare the actual forward limit roll shifting amount regulation efficacy function of the first current analysis roll with the original forward limit roll shifting amount regulation efficacy function, and compare the actual backward limit roll shifting amount regulation efficacy function of the first current analysis roll with the original backward limit roll shifting amount regulation efficacy function; If, in the width direction of the strip, the actual forward limit roll shifting amount regulation efficacy function of the first current analysis roll is less than the original forward limit roll shifting amount regulation efficacy function, and the actual backward limit roll shifting amount regulation efficacy function of the first current analysis roll is greater than the original backward limit roll shifting amount regulation efficacy function, determine that there is a roll offset phenomenon for the first current analysis roll; Determine the first difference between the actual forward limit roll shifting amount regulation efficacy function and the original forward limit roll shifting amount regulation efficacy function of the first current analysis roll, and determine the second difference between the actual backward limit roll shifting amount regulation efficacy function and the original backward limit roll shifting amount regulation efficacy function of the first current analysis roll; Determine the average value of the first difference and the second difference; Based on the average value and the first preset relationship, determine the offset amount of the first current analysis roll; Wherein, when the first current analysis roll is a work roll, the expression of the first preset relationship is as follows: In the first preset relational expression, the offset amount s of the work roll W is in millimeters (mm); R W is the radius of the work roll, in millimeters (mm); the average value Δf of the first difference and the second difference of the work roll W is in millimeters (mm).

3. The roll crossing and offset prediction method for a strip rolling mill according to claim 2, characterized in that The step of determining the offset information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function further includes: If, in the width direction of the strip, there is a situation where the actual forward limit roll shifting amount regulation efficacy function of the first current analysis roll is greater than or equal to the original forward limit roll shifting amount regulation efficacy function, and / or there is a situation where the actual backward limit roll shifting amount regulation efficacy function of the first current analysis roll is less than or equal to the original backward limit roll shifting amount regulation efficacy function, determine that there is no roll offset phenomenon for the first current analysis roll.

4. The roll crossing and offset prediction method for a strip rolling mill according to claim 1, characterized in that The step of determining the crossing information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function includes: Successively take each roll as the second current analysis roll; Determine the third difference between the actual forward limit bending force regulation efficacy function and the original forward limit bending force regulation efficacy function of the second current analysis roll, and determine the fourth difference between the actual backward limit bending force regulation efficacy function and the original backward limit bending force regulation efficacy function of the second current analysis roll; If, in the width direction of the strip, there is a change in the third difference or the fourth difference, determine that there is a roll crossing phenomenon for the second current analysis roll; Determine the maximum difference position corresponding to the maximum value of the third difference or the fourth difference; Determine a first difference of the third difference at the operating side boundary position of the second current analysis roll, and determine a second difference of the third difference at the drive side boundary position of the second current analysis roll; Determine a third difference of the fourth difference at the operating side boundary position of the second current analysis roll, and determine a fourth difference of the fourth difference at the drive side boundary position of the second current analysis roll; Determine the crossing angle of the second current analysis roll according to the maximum difference position, the first difference, the second difference, the third difference, the fourth difference and a second preset relationship; Wherein, when the second current analysis roll is a work roll, the expression of the second preset relationship is as follows: In the expression of the second preset relationship, the crossing angle θ of the work roll W is in °; the first difference Δf of the third difference value of the work roll at the boundary position of the operating side of the work roll W+EC , the second difference Δf of the third difference value of the work roll at the boundary position of the drive side of the work roll W+ED , the third difference Δf of the fourth difference value of the work roll at the boundary position of the operating side of the work roll W-EC and the fourth difference Δf of the fourth difference value of the work roll at the boundary position of the drive side of the work roll W-ED are all in mm; L W is the length of the work roll, in mm.

5. The roll crossing and offset prediction method for a strip mill according to claim 4, characterized in that The step of determining the crossing information of each roll according to the original limit regulation efficacy function and the actual limit regulation efficacy function further includes: If the third difference and the fourth difference remain constant in the width direction of the strip, it is determined that there is no roll crossing phenomenon in the second current analysis roll.

6. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program runs, it controls the device where the storage medium is located to execute the strip mill roll crossing offset prediction method according to any one of claims 1 to 5.

7. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory connected to the processor, wherein the processor is used to call program instructions in the memory to execute the strip mill roll crossing offset prediction method according to any one of claims 1 to 5.

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