Roller thermal expansion analysis method, device and storage medium

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Through the roll attribute information and thermal expansion prediction model, the roll period is automatically identified and the roll thermal expansion amount is analyzed, which solves the problem that the roll thermal expansion amount cannot be measured and controlled in real time, and achieves the stability and diagnostic optimization of product quality.

CN112364460BActive Publication Date: 2025-01-14SHOUGANG GROUP CO LTD

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Patent Information

Application Number: CN202011324780.7
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2020-11-23
Publication Date: 2025-01-14
Estimated Expiration: 2040-11-23

AI Technical Summary

Technical Problem

In the hot continuous rolling production line, the thermal expansion of the roll cannot be measured and controlled in real time, resulting in hidden dangers in product quality and it is difficult for the prior art to accurately diagnose and optimize quality problems during the rolling process.

Method used

The thermal expansion amount of the roll is determined based on the roll attribute information and the preset thermal expansion amount prediction model when rolling each strip, and the roll period identification and diagnosis module is used to automatically identify the roll period and analyze the roll thermal expansion amount to achieve the thermal expansion amount of the roll period to achieve the thermal expansion amount of the roll period through the roll period identification and diagnosis module. detection and control.

Benefits of technology

Accurate detection and control of the thermal expansion amount of rolls is achieved, the stability of product quality is ensured, the prerequisites for quality diagnosis and optimization are provided, and the consumption of human data statistics and analysis is reduced.

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Abstract

The present invention provides a roller thermal expansion analysis method, device and storage medium. The method is applied to a hot rolling production line. The method includes: based on the attribute information of each stand roller when rolling each strip steel and a preset thermal expansion prediction model, determining the thermal expansion of each stand roller when rolling each strip steel; based on the thermal expansion of each stand roller when rolling each strip steel, determining the N rolling roll periods included in the hot rolling process, where N is a positive integer; for each roll period in the N rolling roll periods, based on the thermal expansion of each stand roller when rolling each strip steel in the roll period, determining whether the thermal expansion of each stand roller converges. The above scheme can automatically identify each roll period in the hot rolling production line, and analyze and diagnose the thermal expansion of each stand roller in each roll period, providing a prerequisite guarantee for the quality control of subsequent products.

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Description

Technical Field

[0001] The invention relates to the field of rolling technology, and in particular to a roller thermal expansion analysis method, device and storage medium. Background Art

[0002] At present, the quality problems left over from various processes in the steel industry usually belong to multivariable coupling problems. The existing system lacks efficient quality diagnosis, analysis and optimization technology. It is difficult to find the root cause of the problem through simple threshold analysis and comparative analysis, which makes quality defects occur frequently and repeatedly. The information-physical system is a technology that focuses on networking physical equipment, that is, interconnecting equipment so that physical equipment has functions such as computing, communication, precise control, remote coordination and autonomy. When the interconnected system is used in steel enterprises, its purpose and foothold are still to control the quality of the product. This patented technology is based on the development of an intelligent data control platform, and is embedded in the information-physical system as an independent module to achieve a technology for accurate diagnosis of quality problems in the rolling automation process.

[0003] In the prior art, during the production of strip steel in a hot rolling production line, the rollers of each stand will experience thermal expansion. If the thermal expansion of the rollers is in an unreasonable or unstable state, it will cause quality problems in the rolled strip steel. However, since the thermal expansion of the rollers cannot be measured in real time during the rolling process, it is impossible to detect and control the thermal expansion of the rollers, which in turn leads to hidden dangers in the quality of subsequent products. Summary of the invention

[0004] The embodiments of this specification provide a roller thermal expansion analysis method, device and storage medium.

[0005] In a first aspect, the present invention provides a roller thermal expansion analysis method, which is applied to a hot rolling production line, and is characterized in that the method comprises:

[0006] Determine the thermal expansion of the rolls of each stand when rolling each piece of steel strip based on the property information of the rolls of each stand when rolling each piece of steel strip and a preset thermal expansion prediction model;

[0007] Based on the thermal expansion of the rolls of each stand when rolling each strip steel, determining N rolling roll periods included in the hot rolling process, where N is a positive integer;

[0008] For each of the N rolling roll periods, it is determined whether the thermal expansion of the rolls of each stand converges based on the thermal expansion of the rolls of each stand when rolling each steel strip in the rolling period.

[0009] Optionally, determining N rolling roll periods included in the hot rolling process based on the thermal expansion of each stand roll when rolling each strip of steel comprises:

[0010] When it is detected that the thermal expansion amount of each stand roll when rolling the target steel strip meets a first preset range, determining that the target steel strip is the first steel strip of the target roll period;

[0011] For each stand roll, when the difference between the thermal expansion amount of the stand roll when rolling the upper strip steel and the thermal expansion amount of the stand roll when rolling the lower strip steel meets the second preset range, the upper strip steel is determined to be the last strip steel of the target roll period;

[0012] The target rolling period is determined based on the first steel strip and the last steel strip.

[0013] Optionally, for each rolling period in the N rolling rolling periods, determining whether the thermal expansion amount of each stand roll converges based on the thermal expansion amount of each stand roll when rolling each strip steel in the rolling period includes:

[0014] For each rolling period, determining the difference in thermal expansion of the target stand roll when rolling two adjacent strips in the rolling period;

[0015] Based on the difference in thermal expansion between two adjacent rolled steel strips, determining whether the thermal expansion of the target stand roll is in a stable state during the roll period;

[0016] When the thermal expansion amount of the target stand roll is in a stable state during the roll period, a target thermal expansion amount of the target stand roll in the stable state is determined, and based on the target thermal expansion amount, it is determined whether the thermal expansion amount of the target stand roll in the roll period converges.

[0017] Optionally, determining whether the thermal expansion amount of the target stand roll is in a stable state during the rolling period based on the difference in thermal expansion amounts of two adjacent rolled steel strips comprises:

[0018] Number each strip steel in the roll period;

[0019] When it is first detected that the target stand roll continuously rolls M strips of steel within the roll period, the difference in thermal expansion between any two adjacent strips of steel in the M strips of steel meets the third preset range, and the target number of the previous strip of steel of the M strips of steel is determined, where M is an integer greater than 1;

[0020] Determine whether the target number meets a fourth preset range. If the target number does not meet the fourth preset range, determine that the thermal expansion amount of the target stand roll is in a stable state during the roll period.

[0021] Optionally, when the thermal expansion amount of the target stand roller is in a stable state during the rolling period, determining a target thermal expansion amount of the target stand roller in the stable state, and determining whether the thermal expansion amount of the target stand roller in the rolling period converges based on the target thermal expansion amount, comprises:

[0022] taking the average value of the thermal expansion amount when the target stand rolls roll each strip in the stable state as the target thermal expansion amount;

[0023] When the target thermal expansion amount satisfies a fifth preset range, it is determined that the thermal expansion amount of the target stand roll is converged.

[0024] Optionally, after determining whether the thermal expansion amounts of the rollers of each stand have converged, the method further comprises:

[0025] If the thermal expansion amounts of the rolls of the respective stands do not converge, the target parameters of the rolls of the stands whose thermal expansion amounts do not converge are adjusted.

[0026] Optionally, after determining the N rolling roll periods included in the hot rolling process, the method further includes:

[0027] Determining the type of strip steel rolled in each rolling period;

[0028] Based on the type of steel strip rolled in each rolling period, configuring parameters in each rolling period for judging whether the thermal expansion of the rolls of each stand is convergent;

[0029] The step of determining, for each of the N rolling roll periods, whether the thermal expansion amounts of the rolls of each stand converge based on the thermal expansion amounts of the rolls of each stand when rolling each steel strip in the rolling roll period, comprises:

[0030] For each rolling period, it is determined whether the thermal expansion of each stand roller converges based on the thermal expansion of each stand roller when rolling each strip steel in the rolling period and the parameters used to judge whether the thermal expansion of each stand roller converges in the rolling period.

[0031] In a second aspect, an embodiment of the present specification provides a roller thermal expansion analysis device, which is applied to a hot rolling production line, and is characterized in that the device comprises:

[0032] A prediction module, used to determine the thermal expansion amount of the rolls of each stand when rolling each piece of steel strip based on the property information of the rolls of each stand when rolling each piece of steel strip and a preset thermal expansion amount prediction model;

[0033] A roll period determination module, used to determine N rolling roll periods included in the hot rolling process based on the thermal expansion of the rolls of each stand when rolling each strip steel, where N is a positive integer;

[0034] The convergence determination module is used to determine whether the thermal expansion amount of each stand roll converges for each roll period in the N rolling roll periods based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period.

[0035] Optionally, the rolling period determination module is used to:

[0036] When it is detected that the thermal expansion amount of each stand roll when rolling the target steel strip meets a first preset range, determining that the target steel strip is the first steel strip of the target roll period;

[0037] For each stand roll, when the difference between the thermal expansion amount of the stand roll when rolling the upper strip steel and the thermal expansion amount of the stand roll when rolling the lower strip steel meets the second preset range, the upper strip steel is determined to be the last strip steel of the target roll period;

[0038] The target rolling period is determined based on the first steel strip and the last steel strip.

[0039] Optionally, the convergence determination module is used to:

[0040] For each rolling period, determining the difference in thermal expansion of the target stand roll when rolling two adjacent strips in the rolling period;

[0041] Determining whether the thermal expansion of the target stand roll is in a stable state during the rolling period based on the difference in thermal expansion when rolling two adjacent strips;

[0042] When the thermal expansion amount of the target stand roll is in a stable state during the roll period, a target thermal expansion amount of the target stand roll in the stable state is determined, and based on the target thermal expansion amount, it is determined whether the thermal expansion amount of the target stand roll in the roll period converges.

[0043] Optionally, the convergence determination module is used to:

[0044] Number each strip steel in the roll period;

[0045] When it is first detected that the target stand roll continuously rolls M strips of steel within the roll period, the difference in thermal expansion between any two adjacent strips of steel in the M strips of steel meets the third preset range, and the target number of the previous strip of steel of the M strips of steel is determined, where M is an integer greater than 1;

[0046] Determine whether the target number meets a fourth preset range. If the target number does not meet the fourth preset range, determine that the thermal expansion amount of the target stand roll is in a stable state during the roll period.

[0047] Optionally, the convergence determination module is used to:

[0048] taking the average value of the thermal expansion amount when the target stand rolls roll each strip in the stable state as the target thermal expansion amount;

[0049] When the target thermal expansion amount satisfies a fifth preset range, it is determined that the thermal expansion amount of the target stand roll is converged.

[0050] Optionally, the device further comprises:

[0051] The adjustment module is used to adjust the target parameters of the rolls of the racks whose thermal expansion amounts do not converge if the thermal expansion amounts of the rolls of the racks do not converge.

[0052] Optionally, the device further comprises:

[0053] A strip steel type determination module, used to determine the type of strip steel rolled in each rolling period;

[0054] A parameter configuration module, configured to configure parameters for determining whether the thermal expansion of the rolls of each stand converges in each rolling period based on the type of the strip rolled in each rolling period;

[0055] The convergence determination module is used to determine whether the thermal expansion of each stand roller converges for each rolling period based on the thermal expansion of each stand roller when rolling each strip steel in the rolling period and the parameters in the rolling period used to judge whether the thermal expansion of each stand roller converges.

[0056] In a third aspect, an embodiment of the present specification provides a roller thermal expansion analysis device, characterized in that it includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of any of the above methods when executing the program.

[0057] In a fourth aspect, an embodiment of the present specification provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0058] The beneficial effects of the embodiments of this specification are as follows:

[0059] In the technical solution of the embodiment of the present invention, in the hot rolling production line, based on the attribute information of each stand roll when rolling each strip of steel and the preset thermal expansion prediction model, the thermal expansion of each stand roll when rolling each strip of steel is determined, based on the thermal expansion of each stand roll when rolling each strip of steel, the N rolling roll periods included in the hot rolling process are determined, and for each roll period, based on the thermal expansion of each stand roll when rolling each strip of steel in the roll period, it is determined whether the thermal expansion of each stand roll converges. Through the above method, each roll period in the hot rolling production line can be accurately and automatically identified, and the thermal expansion of each stand roll in each roll period can be analyzed and diagnosed, so as to realize the detection and control of the thermal expansion of the roll, and provide a prerequisite for the quality control of subsequent products. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0061] Figure 1 A flow chart of a roller thermal expansion analysis method provided in the first aspect of the present application;

[0062] Figure 2 A schematic diagram showing the variation of the thermal expansion of each stand roll with the amount of rolled steel strip within a rolling period provided by the present application;

[0063] Figure 3 A flow chart of another roller thermal expansion analysis method provided in this application;

[0064] Figure 4 A schematic diagram of a roller thermal expansion analysis interface provided in this application;

[0065] Figure 5 This is a schematic diagram of a roller thermal expansion analysis device provided in the second aspect of the present application. DETAILED DESCRIPTION

[0066] The embodiment of the present invention provides a roller thermal expansion analysis method, device and storage medium, which are used to automatically identify each roller period in a hot rolling production line, and analyze and diagnose the thermal expansion of each stand roller in each roller period, providing a prerequisite for quality control of subsequent products. The method is applied to a hot rolling production line, based on the attribute information of each stand roller when rolling each strip steel, and a preset thermal expansion prediction model, to determine the thermal expansion of each stand roller when rolling each strip steel; based on the thermal expansion of each stand roller when rolling each strip steel, determine the N rolling roller periods included in the hot rolling process, where N is a positive integer; for each of the N rolling roller periods, based on the thermal expansion of each stand roller when rolling each strip steel in the roller period, determine whether the thermal expansion of each stand roller converges.

[0067] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0068] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0069] In a first aspect, the present invention provides a method for analyzing thermal expansion of a roll, which is applied to a hot rolling production line, where the hot rolling production line can roll a strip steel through a multi-stand continuous rolling mill, such as a seven-stand continuous rolling mill. Figure 1 As shown, the method comprises the following steps:

[0070] Step S11: determining the thermal expansion of the rolls of each stand when rolling each piece of steel strip based on the property information of the rolls of each stand when rolling each piece of steel strip and a preset thermal expansion prediction model;

[0071] Step S12: determining N rolling roll periods included in the hot rolling process based on the thermal expansion of each stand roll when rolling each strip steel, where N is a positive integer;

[0072] Step S13: for each of the N rolling roll periods, based on the thermal expansion of the rolls of each stand when rolling each steel strip in the rolling period, determining whether the thermal expansion of the rolls of each stand converges.

[0073] In step S11, since the thermal expansion of the rolls is related to various factors, the attribute information of the rolls of each stand may include the material information, density information, specific heat information, etc. of the rolls. In addition, since the strip steel contacts and transfers heat with the rolls during the rolling process, the rolls will have a certain amount of thermal expansion accordingly. Therefore, the heat flow information transmitted by heat conduction information, heat convection information, heat radiation, etc. between the strip steel and the rolls can also be used as the attribute information of the rolls of each stand when rolling the strip steel.

[0074] The preset thermal expansion prediction model may be a pre-trained model, which is used to predict the thermal expansion of each stand roller when rolling the strip during the hot rolling process. When predicting the thermal expansion, the attribute information of the above-mentioned rolls of each stand may be used as the input of the preset thermal expansion prediction model, and the thermal expansion of each roll of the stand is output.

[0075] In the specific implementation process, taking the rolling of a piece of steel strip as an example, the attribute information of each stand roller when rolling the piece of steel strip is obtained. Taking the seven-stand continuous rolling mill as an example, the attribute information of the F1 stand roller when rolling the piece of steel strip, the attribute information of the F2 stand roller when rolling the piece of steel strip, ..., the attribute information of the F7 stand roller when rolling the piece of steel strip is obtained in sequence, and a total of 7 sets of attribute information are obtained. Each set of attribute information is input into the preset thermal expansion prediction model to obtain the thermal expansion of the F1 stand roller when rolling the piece of steel strip, the thermal expansion of the F2 stand roller when rolling the piece of steel strip, ..., the thermal expansion of the F7 stand roller when rolling the piece of steel strip.

[0076] Since the property information of each stand roll may change when rolling each strip, for example, the heat transfer related information between the strip and the roll changes when rolling each strip, when rolling multiple strips, it is necessary to obtain the property information of each stand roll in real time when rolling each strip, and obtain the thermal expansion of each stand roll when rolling each strip based on the preset thermal expansion prediction model. Figure 2 , is a schematic diagram showing how the thermal expansion of each stand roll varies with the amount of rolled strip in one rolling cycle in the embodiments of this specification. Figure 2 In the figure, taking the seven-stand continuous rolling mill as an example, as shown in the figure, at the end of the rolling period, the thermal expansion of each stand is F2, F1, F4, F7, F3, F6, and F5 from large to small.

[0077] In the embodiments of this specification, the thermal expansion amounts of the steel strip and the rollers of each frame can be matched, such as how much the thermal expansion amounts of the rollers of each frame are when rolling steel strip 1, and how much the thermal expansion amounts of the rollers of each frame are when rolling steel strip 2, and the corresponding relationship can be recorded to form a mapping relationship.

[0078] In addition, the input data of the preset thermal expansion prediction model can be set according to actual needs. For example, the attribute information of the roll is used as the input data of the model as mentioned above, and other information and the attribute information of the roll can also be used as the input data of the model together, for example, the environmental information of the rolls of each stand in the hot rolling process is obtained, and the attribute information and the environmental information are used as the input data of the model. Of course, other data can also be used as the input of the model, which is not limited here.

[0079] In the embodiment of this specification, after obtaining the thermal expansion amount of each stand roll when rolling each strip steel, the thermal expansion amount of each stand roll is analyzed. In the specific implementation process, the analysis of the thermal expansion amount includes two parts: roll period identification part and roll period diagnosis part. Among them, the roll period identification part is implemented by step S12, and the roll period diagnosis part is implemented by step S13.

[0080] In step S12, when a certain number of steel strips are rolled, multiple rolling roll periods may be included, and N roll periods in the rolling process are determined by step S12. Specifically, this can be achieved by the following steps: when it is detected that the thermal expansion of each stand roll when rolling the target steel strip meets the first preset range, the target steel strip is determined to be the first steel strip of the target roll period; for each stand roll, when the difference between the thermal expansion of the stand roll when rolling the upper steel strip and the thermal expansion of the stand roll when rolling the lower steel strip meets the second preset range, the upper steel strip is determined to be the last steel strip of the target roll period; based on the first steel strip and the last steel strip, the target roll period is determined.

[0081] Specifically, the target steel strip can be any steel strip in the hot rolling process, and the target roll period is any roll period in the N rolling roll periods. Since the thermal expansion of the rollers is different when rolling each steel strip, when it is detected that the thermal expansion of the target steel strip rolling by the rollers meets the first preset range, the target steel strip is used as the first steel strip in the new roll period, i.e., the target roll period. Among them, the first preset range can be set according to actual needs. In the embodiment of this specification, the first preset range is 0-0.06mm. It should be noted that when determining the first steel strip, it can be determined that the target steel strip is the first steel strip when it is detected that the thermal expansion of the rollers of any frame meets the first preset range when rolling the target steel strip, or it can be determined that the target steel strip is the first steel strip when it is detected that the thermal expansion of the rollers of each frame meets the first preset range. There is no limitation here.

[0082] Further, after determining the first strip of the target rolling period, continue to detect the thermal expansion of the rolls corresponding to each strip piece by piece. When detecting that two adjacent strips are rolled, for the same frame, such as the F1 frame, respectively determine the thermal expansion of the rolls of the frame when rolling two adjacent strips, and calculate the difference between the thermal expansion of the upper strip and the thermal expansion of the lower strip in the two adjacent strips. If the difference meets the second preset range, determine that the upper strip is the last strip of the target rolling period. The second preset range can be set according to actual needs. In the embodiment of this specification, the second preset range is greater than 0.1mm, that is, the thermal expansion of the upper strip is greater than the thermal expansion of the lower strip, and exceeds 0.1mm. It should be noted that when determining the last piece of steel strip, it can be detected that any frame meets the above-mentioned second preset range when rolling two adjacent steel strips, that is, the last piece of steel strip is determined. It can also be detected that each frame meets the above-mentioned second preset range when rolling two adjacent steel strips, and the last piece of steel strip is determined. There is no limitation here.

[0083] Furthermore, through the above method, N roll periods in the hot rolling process are determined to complete roll period identification. In the embodiment of this specification, after the N roll periods are determined, each roll period can also be numbered.

[0084] Next, the roll period diagnosis part is executed. When the roll period diagnosis is performed, it is determined one by one whether the thermal expansion amount of each stand roll determined by the thermal expansion prediction model in each roll period of the N roll periods is reasonable. In the specific process, the roll period diagnosis can be realized by step S13, that is, for each roll period of the N rolling roll periods, based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period, it is determined whether the thermal expansion amount of each stand roll converges. In the embodiment of this specification, determining whether the thermal expansion amount of each stand roll converges may include two steps: firstly judging whether the thermal expansion amount of each stand roll reaches a stable state, and continuing to judge whether the thermal expansion amount of each stand roll is reasonable when reaching a stable state, and when both of the above two steps are satisfied, it is determined that the thermal expansion amount of each stand roll converges.

[0085] In a specific implementation process, step S13 can be achieved in the following manner: for each rolling period, determining the difference in thermal expansion of the target stand roller when rolling two adjacent strips; based on the difference in thermal expansion when rolling two adjacent strips, determining whether the target stand roller is in a stable state within the rolling period; when the target stand roller is in a stable state within the rolling period, determining the target thermal expansion of the target stand roller in the stable state, and determining whether the thermal expansion of the target stand roller within the rolling period converges based on the target thermal expansion.

[0086] Specifically, the target frame is any frame in the hot rolling production line. In the embodiment of this specification, for each frame roll, the thermal expansion amount of the frame roll when rolling the strip in each roll period is used to determine whether the thermal expansion amount of each frame roll converges in each roll.

[0087] Taking a stand roller, such as the F1 stand roller, as an example, when the F1 stand roller rolls a strip steel of a certain rolling period, the thermal expansion amount of the F1 stand roller when rolling each strip steel is predicted by the thermal expansion amount prediction model, and the thermal expansion amount difference of two adjacent strip steels is calculated in turn. Based on the calculated thermal expansion amount difference, it is determined whether the thermal expansion amount of the F1 stand roller is in a stable state during the rolling period.

[0088] In the embodiments of the present specification, whether the thermal expansion of the rack roller is in a stable state can be determined in the following manner: numbering each strip steel in the rolling period; when it is first detected that the target rack roller continuously rolls M strip steels in the rolling period, the difference in the thermal expansion of any two adjacent strip steels in the M strip steels satisfies the third preset range, and the target number of the previous strip steel of the M strip steels is determined, where M is an integer greater than 1; determining whether the target number satisfies the fourth preset range, and if the target number does not satisfy the fourth preset range, determining that the thermal expansion of the target rack roller is in a stable state in the rolling period.

[0089] For each rolling period, multiple strips need to be rolled. In the embodiment of this specification, the strips in each rolling period can be numbered. In the specific implementation process, when the difference in the amount of thermal expansion of two adjacent strips rolled in the target frame for the first time in a rolling period meets the third preset range, wherein the third preset range can be set as needed and is not limited here. In the embodiment of this specification, the third preset range can be selected as the absolute value of the difference in the amount of thermal expansion is less than or equal to 0.0025mm, that is, the absolute value of the difference in the amount of thermal expansion of two adjacent strips in the target frame for the first time is less than or equal to 0.0025mm, and when the number of strips whose amount of thermal expansion of the adjacent strips continuously meets the third preset range is greater than or equal to M, it is determined that the thermal expansion of the rollers of the target frame is in a stable state in the rolling period. Among them, M can be set according to actual conditions, such as M is 6, 7, 8, etc., which is not limited here.

[0090] In the embodiment of this specification, taking M as 6 as an example, each stand in the multi-stand continuous rolling mill group can be used as a target stand once to detect whether the thermal expansion of the rolls of each stand is stable. When the absolute value of the difference in thermal expansion between two adjacent strips of the target stand is less than or equal to 0.0025 mm for the first time, and the absolute value of the difference in thermal expansion between any two adjacent strips of the 6 consecutive adjacent strips is less than or equal to 0.0025 mm, the previous strip of the 6 strips is used as the first strip to reach a stable thermal expansion state, and its target number in the roll period is recorded.

[0091] Further, it is determined whether the target number meets the fourth preset range. The fourth preset range can be set according to actual needs. In the embodiment of this specification, the fourth preset range is a number greater than or equal to 40, and a number less than or equal to the total number of rolling blocks in the roll period; or, the fourth preset range is a number greater than the total number of rolling blocks in the roll period. Of course, the fourth preset range can also be set according to actual needs. For example, under normal circumstances, it is normal for a roll period (rolling 50-60 pieces of strip steel) to reach a stable state after rolling more than 20 pieces. For a relatively long roll period, such as a roll period rolling more than 100 pieces, it is also normal to reach a stable state after rolling 30-40 pieces. Therefore, for the fourth preset range, a specific range can be selected according to actual conditions, and it is not limited here.

[0092] Further, if the target number satisfies the fourth preset range, the thermal expansion of the target stand roll is unstable in the roll period, and therefore, the predicted value of the thermal expansion of the target stand roll does not converge. If the target number does not satisfy the fourth preset range, the thermal expansion of the target stand roll reaches a stable state in the roll period, and it is necessary to further determine whether the target thermal expansion of the target stand roll in the stable state converges.

[0093] When determining the target thermal expansion, the average value of the thermal expansion when the target stand roll rolls roll each strip in the stable state can be used as the target thermal expansion. Specifically, in a certain roll period, after determining the first strip whose thermal expansion reaches a stable state in the roll period, all strips behind the strip are strips in a stable state. For example, if a total of 60 strips are rolled in the roll period, when the 21st strip is rolled, it is determined that the thermal expansion reaches a stable state according to the third and fourth preset ranges, then the 21st to 60th strips are strips rolled in a stable state, and the average value of the thermal expansion of these 40 strips is calculated, and the obtained average value is used as the target thermal expansion.

[0094] Next, determine whether the target thermal expansion meets the fifth preset range. The fifth preset range can be set according to actual needs. In the embodiment of this specification, the fifth preset range can be less than or equal to 0.6 mm and greater than or equal to 0.08 mm, that is, if the target thermal expansion meets the fifth preset range, the thermal expansion of the target stand roller converges, that is, the thermal expansion obtained by the prediction of the target stand roller by the thermal expansion model is reasonable. If the target thermal expansion does not meet the fifth preset range, the thermal expansion of the target stand roller does not converge, that is, the thermal expansion obtained by the prediction of the target stand roller by the thermal expansion model is unreasonable.

[0095] In the embodiment of this specification, the above method is used to determine whether the thermal expansion of each stand roller converges. If the thermal expansion of each stand roller does not converge, the target parameters of the stand roller whose thermal expansion does not converge are adjusted. Specifically, if the thermal expansion of a certain stand roller does not converge, for example, if the target thermal expansion of a certain stand roller is greater than 0.6 mm, it is determined that when the stand roller rolls the strip steel in this roll period, the thermal expansion predicted by the thermal expansion prediction model is too large. At this time, the target parameters of the stand roller can be adjusted, and the target parameters can be parameters such as thermal expansion factor and heat flow coefficient. At the same time, it can be prompted that the predicted thermal expansion of the stand roller may not match the actual thermal expansion, and an early warning can be issued.

[0096] Further, in an embodiment of the present specification, after determining the N rolling roll periods included in the hot rolling process, the method also includes: determining the type of strip rolled in each rolling period; configuring parameters in each rolling period for judging whether the thermal expansion of the rolls of each stand converges based on the type of strip rolled in each rolling period; determining, for each of the N rolling roll periods, whether the thermal expansion of the rolls of each stand converges based on the thermal expansion of the rolls of each stand when rolling each piece of strip in the rolling period, including: determining, for each rolling period, whether the thermal expansion of the rolls of each stand converges based on the thermal expansion of the rolls of each stand when rolling each piece of strip in the rolling period and the parameters in the rolling period for judging whether the thermal expansion of the rolls of each stand converges.

[0097] Specifically, in the embodiment of this specification, after each roll period is determined, the type of strip steel rolled in the roll period is identified, and the strip steel types may include SDC03, SDC01, HS1, JD1, SHG2, SPHC, etc. Different roll periods may roll different types of strip steel. Since the properties of different types of strip steel are greatly different, in the roll period diagnosis process, whether the thermal expansion amount is in a stable state and whether the thermal expansion amount in a stable state is reasonable can have a certain degree of flexibility.

[0098] In the specific implementation process, the parameters used to determine whether the thermal expansion of each stand roller is converged may include the number of strip steel blocks in a stable state, the fifth preset range satisfied by the target thermal expansion, etc. The configuration of these parameters may correspond to the corresponding strip steel type, such as the expert refinement and summary based on long-term rolling experience and the cognition of the model. Different parameters can be configured for different strip steel types. For example, when the strip steel type is type A, the configured parameters are: the number of convergent blocks of the strip steel is 60, and the fifth preset range satisfied by the target thermal expansion is 0.08-0.55mm; when the strip steel type is type B, the configured parameters are: the number of convergent blocks of the strip steel in the roll period is 40, and the fifth preset range satisfied by the target thermal expansion is 0.08-0.6mm. Of course, in addition to the above parameters, other parameters can also be configured, which are not limited here. Whether the thermal expansion of each stand roller is converged is determined based on the configured parameters.

[0099] To better understand the roller thermal expansion analysis method provided in the embodiments of this specification, please refer to Figure 3 , is a flow chart of a roller thermal expansion analysis method provided in an embodiment of this specification. Figure 3 In this paper, the roller thermal expansion analysis method is divided into two parts: roller identification and roller diagnosis.

[0100] In the roll period identification part, the attribute information of each stand when rolling each strip is read; the thermal expansion of the rolls for rolling each strip is predicted; it is determined whether the thermal expansion of the rolled strip is detected to be between 0-0.06mm for the first time; if so, the strip is used as the first strip of the roll period; it is determined whether the difference between the thermal expansion of the previous strip and the thermal expansion of the current strip is greater than 0.1mm; if so, the previous strip is used as the last strip of the roll period, and the number of roll periods identified and the number of strips rolled in each roll period are recorded.

[0101] In the roll period diagnosis part, the thermal expansion of each stand roll is diagnosed in each roll period; each strip is searched piece by piece to determine whether the absolute value of the thermal expansion when rolling two adjacent strips is less than or equal to 0.0025mm for the first time and the cumulative number of strips is greater than 6; if so, the coil number, steel type and sequence number of the first strip that reaches a stable state in the roll period are recorded; continue to determine whether the number of the first strip that reaches a stable state is greater than or equal to 40 and the number of the first strip that reaches a stable state is less than or equal to the total number of strips in the roll period, or the number of the first strip that reaches a stable state is greater than the total number of strips in the roll period; if so, the stand whose thermal expansion value does not converge in the roll period is determined and an early warning is issued, and the non-convergent stand is diagnosed. The converged stand number, the corresponding roll period and the time period of the roll period; if not, calculate the average thermal expansion value of all rolls that can reach a stable state; determine whether the average thermal expansion value of the rolls of the racks retrieved in the same roll period after reaching a stable state is greater than 0.6mm and less than 0.08mm; if so, diagnose whether the predicted value of the thermal expansion value of the rolls of the rack corresponding to the roll period is too large or too small; compare the average thermal expansion value of each rack after reaching a stable state, diagnose the stand number with the largest / smallest thermal expansion value, and sort them; summarize whether there are abnormal problems in the predicted thermal expansion values of all racks in the diagnosed roll period, and indicate the causes and provide solutions for the diagnosed abnormal problems; if not, diagnose that the predicted value of the thermal expansion value is normal.

[0102] In order to further illustrate the roller thermal expansion analysis method provided in the present application, taking a hot rolling production line with seven stands of continuous rolling unit rolling one roll of strip steel as an example, the thermal expansion analysis is performed using the method provided in the present application for illustration.

[0103] There are many types of steel rolled in this rolling period, mainly including SDC03, SDC01, HS1, JD1, SHG2, SPHC, etc. The thickness specifications are between 2.3mm and 6mm, and the width specifications are between 950mm and 1305mm. The index numbers corresponding to the thickness and width ranges are shown in Table 1.

[0104] Table 1 Thickness and width index number

[0105] Thickness index grt Thickness range mm Width index wrt Width range mm 1 (0,0.8) 1 Spare 2 [0.8,0.9) 2 (0,1000) 3 [0.9,1.0) 3 [1000,1100) 4 [1.0,1.15) 4 [1100,1200) 5 [1.15,1.3) 5 [1200,1300) 6 [1.3,1.5) 6 [1300,1400) 7 [1.5,1.7) 7 [1400,1500) 8 [1.7,1.9) 8 [1500,--) 9 [1.9,2.2) 10 [2.2,2.5) 11 [2.5,2.9) 12 [2.9,3.4) 13 [3.4,4.0) 14 [4.0,5.0) 15 [5.0,6.5) 16 [6.5,8.0) 17 [8.0,9.5)

[0106] In order to facilitate the operation of roller thermal expansion analysis, such as Figure 4As shown, it is a schematic diagram of a roller thermal expansion analysis interface provided in an embodiment of the present specification, through which the thermal expansion of the roller can be analyzed and diagnosed. When operating the roller thermal expansion analysis interface, select the production line and production time period through the interface, click "cal", and the complete roller period contained in the time period will be accurately identified and the number will be marked, and then the roller period number will be selected, and the thermal expansion diagnosis of the selected roller period will appear. After selecting a "roll number" in the interface, the corresponding steel type name, thickness (GRT), width (WRT) layer and roller period can be automatically displayed, and the sorting position, roll number and thermal expansion value of the steel type in the roll period can be automatically displayed in the roll period thermal expansion trend diagram; the "roll number" can also be left unselected, and the overall trend diagnosis of all steel types in the roll period can be performed in batches.

[0107] like Figure 4 As shown, the roll period diagnosed in this embodiment rolled 85 strips in total, the number of convergence blocks set in the background configuration file is 60, and the diagnosis result is the 58th block converges, indicating that the convergence speed of this roll period is slow and the relevant parameters need to be adjusted. In the converged roll period of each rack, the value of thermal expansion after stable convergence is still diagnosed. The thermal expansion of the F2 rack exceeds 0.55mm. According to expert experience, this value is too large and may be different from the actual thermal expansion of the rack. The diagnosis prompts "adjust the thermal expansion factor or heat flow coefficient" and further verification is recommended.

[0108] In summary, the roller thermal expansion analysis method provided in the embodiment of this specification can accurately and automatically identify each roller period in the hot rolling production line, and analyze and diagnose the thermal expansion of each frame roller in each roller period, thereby realizing the detection and control of the thermal expansion of the roller, and providing a prerequisite for quality control of subsequent products.

[0109] In addition, the roller thermal expansion analysis method provided in the embodiment of this specification can not only greatly reduce the consumption of manpower for data statistics and analysis, but also timely diagnose and warn the difficult quality problems in production that are discovered only after analysis by combining expert experience, and provide corresponding optimization strategy suggestions, so as to more accurately control and handle quality problems, significantly improve the level of product quality process control, and effectively avoid and control the occurrence of similar quality problems. At the same time, in the future, the domestic steel industry will still have a long-term oversupply, and users will have higher and higher requirements for product quality. At the same time, personalized and diversified demands are also increasing. The implementation of this solution can also be carried out according to different product requirements and fine diagnosis of similar quality problems. The configuration of the personalized diagnostic parameters provided is set based on the refinement and summary of expert experience to achieve customized accurate warning and diagnostic analysis of various products.

[0110] In a second aspect, the embodiments of this specification provide a roller thermal expansion analysis device, which is applied to a hot rolling production line, such as Figure 5 As shown, the device comprises:

[0111] A prediction module 31, for determining the thermal expansion of the rolls of each stand when rolling each strip of steel based on the property information of the rolls of each stand when rolling each strip of steel and a preset thermal expansion prediction model;

[0112] A roll period determination module 32, for determining N rolling roll periods included in the hot rolling process based on the thermal expansion of the rolls of each stand when rolling each strip of steel, where N is a positive integer;

[0113] The convergence determination module 33 is used to determine whether the thermal expansion amount of each stand roll converges for each roll period in the N rolling roll periods based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period.

[0114] Optionally, the rolling period determination module 32 is used to:

[0115] When it is detected that the thermal expansion amount of each stand roll when rolling the target steel strip meets a first preset range, determining that the target steel strip is the first steel strip of the target roll period;

[0116] For each stand roll, when the difference between the thermal expansion amount of the stand roll when rolling the upper strip steel and the thermal expansion amount of the stand roll when rolling the lower strip steel meets the second preset range, the upper strip steel is determined to be the last strip steel of the target roll period;

[0117] The target rolling period is determined based on the first steel strip and the last steel strip.

[0118] Optionally, the convergence determination module 33 is used to:

[0119] For each rolling period, determining the difference in thermal expansion of the target stand roll when rolling two adjacent strips in the rolling period;

[0120] Determining whether the thermal expansion of the target stand roll is in a stable state during the rolling period based on the difference in thermal expansion when rolling two adjacent strips;

[0121] When the thermal expansion amount of the target stand roll is in a stable state during the roll period, a target thermal expansion amount of the target stand roll in the stable state is determined, and based on the target thermal expansion amount, it is determined whether the thermal expansion amount of the target stand roll in the roll period converges.

[0122] Optionally, the convergence determination module 33 is used to:

[0123] Number each strip steel in the roll period;

[0124] When it is first detected that the target stand roll continuously rolls M strips of steel within the roll period, the difference in thermal expansion between any two adjacent strips of steel in the M strips of steel meets the third preset range, and the target number of the previous strip of steel of the M strips of steel is determined, where M is an integer greater than 1;

[0125] Determine whether the target number meets a fourth preset range. If the target number does not meet the fourth preset range, determine that the thermal expansion amount of the target stand roll is in a stable state during the roll period.

[0126] Optionally, the convergence determination module 33 is used to:

[0127] taking the average value of the thermal expansion amount when the target stand rolls roll each strip in the stable state as the target thermal expansion amount;

[0128] When the target thermal expansion amount satisfies a fifth preset range, it is determined that the thermal expansion amount of the target stand roll is converged.

[0129] Optionally, the device further comprises:

[0130] The adjustment module is used to adjust the target parameters of the rolls of the racks whose thermal expansion amounts do not converge if the thermal expansion amounts of the rolls of the racks do not converge.

[0131] Optionally, the device further comprises:

[0132] A strip steel type determination module, used to determine the type of strip steel rolled in each rolling period;

[0133] A parameter configuration module, configured to configure parameters for determining whether the thermal expansion of the rolls of each stand converges in each rolling period based on the type of the strip rolled in each rolling period;

[0134] The convergence determination module is used to determine whether the thermal expansion of each stand roller converges for each rolling period based on the thermal expansion of each stand roller when rolling each strip steel in the rolling period and the parameters in the rolling period used to judge whether the thermal expansion of each stand roller converges.

[0135] Regarding the above-mentioned device, the specific functions of each module therein have been described in detail in the embodiment of the roller thermal expansion analysis method provided in the embodiment of this specification, and will not be elaborated here.

[0136] On the third aspect, based on the same inventive concept of the roller thermal expansion analysis method in the aforementioned embodiment, the present specification also provides a roller thermal expansion analysis device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any implementation of the roller thermal expansion analysis method described above are implemented.

[0137] Among them, the bus architecture (represented by the bus), the bus can include any number of interconnected buses and bridges, and the bus links various circuits including one or more processors represented by the processor and memory represented by the memory. The bus can also link various other circuits such as peripherals, voltage regulators, and power management circuits together, which are all well known in the art and are therefore not further described herein. The bus interface provides an interface between the bus and the receiver and transmitter. The receiver and transmitter can be the same element, namely a transceiver, which provides a unit for communicating with various other devices on a transmission medium. The processor is responsible for managing the bus and general processing, while the memory can be used to store data used by the processor when performing operations.

[0138] In a fourth aspect, based on the same inventive concept as the roller thermal expansion analysis method in the aforementioned embodiment, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods in the roller thermal expansion analysis method described above.

[0139] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0140] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0141] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0142] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0143] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0144] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A roller thermal expansion analysis method, applied to hot rolling production line, characterized in that: The method comprises: Determine the thermal expansion of the rolls of each stand when rolling each piece of steel strip based on the property information of the rolls of each stand when rolling each piece of steel strip and a preset thermal expansion prediction model; Based on the thermal expansion amount of each stand roll when rolling each strip steel, determining N rolling roll periods included in the hot rolling process, including: when it is detected that the thermal expansion amount of each stand roll when rolling the target strip steel meets the first preset range, determining the target strip steel as the first strip steel of the target rolling period; for each stand roll, when the difference between the thermal expansion amount of the stand roll when rolling the upper strip steel and the thermal expansion amount of the stand roll when rolling the lower strip steel meets the second preset range, determining the upper strip steel as the last strip steel of the target rolling period; determining the target rolling period based on the first strip steel and the last strip steel, N is a positive integer; For each of the N rolling roll periods, based on the thermal expansion of each stand roll when rolling each strip steel in the rolling period, determining whether the thermal expansion of each stand roll converges, including: for each rolling period, determining the thermal expansion difference of the target stand roll when rolling two adjacent strip steels in the rolling period; based on the thermal expansion difference of rolling two adjacent strip steels, determining whether the thermal expansion of the target stand roll is in a stable state in the rolling period; when the thermal expansion of the target stand roll is in a stable state in the rolling period, determining the target thermal expansion of the target stand roll in the stable state, and determining whether the thermal expansion of the target stand roll in the rolling period converges based on the target thermal expansion; The step of determining whether the thermal expansion of the target stand roll is in a stable state within the roll period based on the difference in thermal expansion of the two adjacent rolled steel strips comprises: numbering each steel strip within the roll period; when it is first detected that the target stand roll continuously rolls M steel strips within the roll period, the difference in thermal expansion of any two adjacent steel strips among the M steel strips satisfies a third preset range, and determining the target number of the previous steel strip of the M steel strips, where M is an integer greater than 1; determining whether the target number satisfies a fourth preset range, and if the target number does not satisfy the fourth preset range, determining that the thermal expansion of the target stand roll is in a stable state within the roll period; The method also includes: determining the type of strip rolled in each rolling period; configuring parameters in each rolling period for judging whether the thermal expansion of each stand roller has converged based on the type of strip rolled in each rolling period; determining, for each of the N rolling rolling periods, whether the thermal expansion of each stand roller has converged based on the thermal expansion of each stand roller when rolling each piece of strip in the rolling period, including: determining, for each rolling period, whether the thermal expansion of each stand roller has converged based on the thermal expansion of each stand roller when rolling each piece of strip in the rolling period and the parameters in the rolling period for judging whether the thermal expansion of each stand roller has converged.

2. The method according to claim 1, characterized in that When the thermal expansion amount of the target stand roller is in a stable state during the rolling period, determining the target thermal expansion amount of the target stand roller in the stable state, and determining whether the thermal expansion amount of the target stand roller in the rolling period converges based on the target thermal expansion amount, including: taking the average value of the thermal expansion amount when the target stand rolls roll each strip in the stable state as the target thermal expansion amount; When the target thermal expansion amount satisfies a fifth preset range, it is determined that the thermal expansion amount of the target stand roll is converged.

3. The method according to claim 1, characterized in that After determining whether the thermal expansion amounts of the rollers of each stand have converged, the method further comprises: If the thermal expansion amounts of the rolls of the respective stands do not converge, the target parameters of the rolls of the stands whose thermal expansion amounts do not converge are adjusted.

4. A roller thermal expansion analysis device, used in a hot rolling production line, characterized in that: The device comprises: A prediction module, used to determine the thermal expansion amount of the rolls of each stand when rolling each piece of steel strip based on the property information of the rolls of each stand when rolling each piece of steel strip and a preset thermal expansion amount prediction model; A roll period determination module is used to determine N rolling roll periods included in the hot rolling process based on the thermal expansion amount of each stand roll when rolling each strip of steel, including: when it is detected that the thermal expansion amount of each stand roll when rolling the target strip meets the first preset range, determine the target strip as the first strip of steel in the target roll period; for each stand roll, when the difference between the thermal expansion amount of the stand roll when rolling the upper strip and the thermal expansion amount of the stand roll when rolling the lower strip meets the second preset range, determine the upper strip as the last strip of steel in the target roll period; determine the target roll period based on the first strip and the last strip, where N is a positive integer; A convergence determination module is used to determine, for each of the N rolling roll periods, whether the thermal expansion of each stand roll converges based on the thermal expansion of each stand roll when rolling each strip steel in the rolling period, including: for each rolling period, determining the difference in thermal expansion of the target stand roll when rolling two adjacent strip steels in the rolling period; based on the difference in thermal expansion of rolling two adjacent strip steels, determining whether the thermal expansion of the target stand roll is in a stable state in the rolling period; when the thermal expansion of the target stand roll is in a stable state in the rolling period, determining a target thermal expansion of the target stand roll in the stable state, and determining whether the thermal expansion of the target stand roll in the rolling period converges based on the target thermal expansion; The convergence determination module is further used to number each strip steel in the rolling period; when it is first detected that the target stand roll continuously rolls M strip steels in the rolling period, the difference in the thermal expansion of any two adjacent strip steels in the rolling of the M strip steels satisfies the third preset range, and the target number of the previous strip steel of the M strip steels is determined, where M is an integer greater than 1; determine whether the target number satisfies the fourth preset range, and if the target number does not satisfy the fourth preset range, determine that the thermal expansion of the target stand roll is in a stable state in the rolling period; A strip steel type determination module, used to determine the type of strip steel rolled in each rolling period; A parameter configuration module, configured to configure parameters for determining whether the thermal expansion of the rolls of each stand converges in each rolling period based on the type of the strip rolled in each rolling period; The convergence determination module is used to determine whether the thermal expansion of each stand roller converges for each rolling period based on the thermal expansion of each stand roller when rolling each strip steel in the rolling period and the parameters in the rolling period used to judge whether the thermal expansion of each stand roller converges.

5. A roller thermal expansion analysis device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the steps of the method according to any one of claims 1 to 3 are implemented when the processor executes the program.

6. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.