Control method and device for improving finish rolling threading stability, storage medium and product

Abstract

The invention provides a control method and device for improving finish rolling threading stability, a storage medium and a product, relates to the field of hot rolling production, and solves the technical problems that in the prior art, when a high-strength thin specification is changed, a head is easily broken by rolling and the thickness of the head end is abnormal in a finish rolling threading link. The method specifically comprises the following steps: acquiring parameters, and judging whether to trigger AGC (Automatic Gain Control) switching according to the difference of the parameters; after AGC switching is triggered, an AGC compensation value is determined based on the parameters of the to-be-rolled strip steel, and the roll gap of the rolling mill is adjusted; determining an impact compensation coefficient by combining the second-stage control system with the current parameter, and issuing the impact compensation coefficient to the first-stage control system; tEGO parameters are determined through the secondary control system in combination with parameter classification of the current to-be-rolled strip steel, and the TEGO parameters are issued to the primary control system; and switching back to the absolute AGC control strategy after the number of the strip steel rolled by the relative AGC control reaches a preset stable block number. The method is used for improving the finish rolling threading stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot rolling production, and particularly relates to a control method and device for improving stability of precision rolling threading, a storage medium and a product. BACKGROUND

[0002] Improving the stability of precision rolling threading is crucial to product quality and production efficiency. The existing hot rolling precision rolling stage usually adopts absolute AGC control to ensure the thickness of the strip to ensure the precision of the finished product. When producing high-strength thin specifications and changing specifications, experienced technicians manually switch to relative AGC to maintain production. At the same time, the tail opening gap function (TEGO) is used to reduce the thickening of the tail of the strip, and the conventional head thickness control means is used to deal with the thickness deviation of the head. However, in actual production, the absolute AGC is prone to cause the head of the strip to be rolled when changing the high-strength thin specifications due to the instability of the secondary model setting, the too large temperature difference between the head and the FET sampling point, and the too fast adjustment, and the manual switching of AGC lacks long-term stability. The existing control combination cannot effectively avoid the head rolling and thickness abnormalities during the threading process. Therefore, the existing technology has the technical problem that the head rolling and the thickness abnormalities of the head are prone to occur during the precision rolling threading process when changing the high-strength thin specifications. SUMMARY

[0003] The present application provides a control method and device for improving the stability of precision rolling threading, a storage medium and a product, which solves the technical problem that the head rolling and the thickness abnormalities of the head are prone to occur during the precision rolling threading process when changing the high-strength thin specifications.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: In a first aspect, a control method for improving finishing strip running stability is provided, including: obtaining parameters of a current to-be-rolled strip and a previous rolled strip, and determining whether to trigger AGC switching through differences in the parameters; the parameters include SGC, strip thickness, and strip width; the AGC switching is sending a first instruction from a secondary control system to a primary control system to switch the thickness control strategy from absolute AGC to relative AGC; after triggering the AGC switching, determining a cut AGC compensation value based on the parameters of the current to-be-rolled strip, adjusting the roll gap of the rolling mill through the head-end thickness target shifting function based on the cut AGC compensation value; determining an impact compensation coefficient through the secondary control system in combination with the parameters of the current to-be-rolled strip, and sending the impact compensation coefficient to the primary control system; the impact compensation coefficient is used to adjust the rolling mill parameters based on the impact compensation coefficient through the primary control system at the moment of strip biting or strip throwing; determining TEGO parameters through the secondary control system in combination with the parameters of the current to-be-rolled strip, and sending the TEGO parameters to the primary control system; the TEGO parameters are used to execute the roll gap opening action based on the TEGO parameters through the primary control system when the tail of the strip is about to leave the rolling mill; after the number of strips rolled in the relative AGC control reaches a preset stable block number corresponding to the current to-be-rolled strip, sending a second instruction from the secondary control system to the primary control system to switch back to the absolute AGC control strategy.

[0005] In combination with the first aspect, in a possible implementation manner, whether to trigger the AGC switching is determined through differences in the parameters of the current to-be-rolled strip and the previous rolled strip, including: matching the strip thicknesses of the current to-be-rolled strip and the previous rolled strip to a preset thickness interval to obtain a current thickness interval identifier and a previous thickness interval identifier; matching the strip widths of the current to-be-rolled strip and the previous rolled strip to a preset width interval to obtain a current width interval identifier and a previous width interval identifier; the preset thickness interval is divided according to the line capacity and the common rolling thickness range; the preset width interval is divided according to the line capacity and the common rolling width range; the condition for triggering the AGC switching is that the first block of steel meets condition A1, and the Nth block of steel after the first block of steel does not meet condition A1; condition A1 is that the current strip SGC is different from the previous strip SGC, or the current thickness interval identifier is different from the previous thickness interval identifier, or the current width interval identifier is different from the previous width interval identifier; the value adjustment rule of N is that the greater the strip width and the thinner the strip thickness, the greater the value of N.

[0006] In a possible implementation manner of the first aspect, after triggering the AGC switching, the AGC compensation value is determined based on the parameters of the front strip to be rolled, and the roll gap of the rolling mill is adjusted based on the AGC compensation value through the head thickness target shifting function, including: based on the parameters of the current strip to be rolled, the AGC compensation value obtained by previously switching the same parameter specification strip to the relative AGC and then statistically analyzing the head thickness data is retrieved; the AGC compensation value is the abnormal statistical value of the head thickness after the parameter specification strip is switched to the relative AGC; the head thickness state of the current strip to be rolled is obtained through the head thickness target shifting function, and the head thickness deviation of the strip is determined according to the head thickness state; the target shifting value is determined based on the head thickness deviation through the secondary control system, if the AGC switching has been triggered, the basic thickness target value corresponding to the target shifting value is reduced by the AGC compensation value as the secondary target thickness; if the AGC switching has not been triggered, the basic thickness target value corresponding to the target shifting value is taken as the secondary target thickness; the secondary target thickness is sent to the primary control system through the secondary control system, and the roll gap of the rolling mill is adjusted according to the secondary target thickness by the primary control system.

[0007] In a possible implementation manner of the first aspect, the impact compensation coefficient is determined by the secondary control system in combination with the parameters of the current strip to be rolled, including: the pre-stored impact compensation coefficient parameter table is retrieved in the secondary control system; the parameter table takes the parameters of the strip as the classification dimension, and stores the impact compensation coefficients corresponding to different parameter specification strips; the corresponding impact compensation coefficient is matched from the impact compensation coefficient parameter table based on the parameters of the current strip to be rolled; if the AGC switching has been triggered, the final impact compensation coefficient is determined as the original impact compensation coefficient x (1+impact compensation coefficient); if the AGC switching has not been triggered, the final impact compensation coefficient is determined as the original impact compensation coefficient.

[0008] In a possible implementation manner of the first aspect, the TEGO parameter is determined by the secondary control system in combination with the parameter classification of the current strip to be rolled, including: the pre-stored TEGO parameter table is retrieved in the secondary control system; the TEGO parameter table takes the parameters of the strip as the classification dimension, and stores the TEGO parameters corresponding to different parameter specification strips; the TEGO parameter includes a TEGO use mark, a TEGO quick opening roll gap opening, and a TEGO quick opening roll gap distance; the TEGO parameter consistent with the specification of the current strip to be rolled is matched from the TEGO parameter table based on the parameters of the current strip to be rolled, and the TEGO parameter of the current strip to be rolled is determined.

[0009] In combination with the first aspect, in a possible implementation manner, at the moment of strip steel biting or throwing, the rolling mill parameters are adjusted by the primary control system based on the impact compensation coefficient, including: at the moment of the head of the current to-be-rolled strip steel entering the rolling mill or the tail of the current to-be-rolled strip steel leaving the rolling mill, the impact compensation coefficient issued by the secondary control system is received and called by the primary control system in real time; based on the impact compensation coefficient, the rolling mill parameters are dynamically adjusted by the primary control system; the rolling mill parameters include the rolling mill roll gap, the rolling speed, and the hydraulic reduction amount.

[0010] In combination with the first aspect, in a possible implementation manner, at the moment when the tail of the strip steel is about to leave the rolling mill, the roll gap opening operation is performed by the primary control system based on the TEGO parameter, including: the TEGO parameter issued by the secondary control system is analyzed by the primary control system, and the TEGO use flag, the TEGO fast-opening roll gap opening degree, and the TEGO fast-opening roll gap distance are extracted; if the TEGO use flag is enabled, the tail position information of the current to-be-rolled strip steel is acquired by the primary control system in real time, and it is judged whether the tail of the strip steel reaches the preset position about to leave the rolling mill; when the tail of the strip steel reaches the preset position, the rolling mill opening roll gap is controlled by the primary control system according to the TEGO fast-opening roll gap opening degree, the opening degree is maintained until the tail of the strip steel completely leaves, and then the roll gap is reset to the normal rolling opening degree.

[0011] The second aspect provides a control device for improving the stability of the finishing rolling strip, including: a communication unit and a processing unit; the communication unit is used to acquire the parameters of the current to-be-rolled strip steel and the previous rolled strip steel; the processing unit is used to judge whether to trigger AGC switching through the difference between the parameters; the AGC switching is that the first instruction is sent from the secondary control system to the primary control system, and the thickness control strategy is switched from the absolute AGC to the relative AGC; after the AGC switching is triggered, the AGC compensation value is determined based on the parameters of the current to-be-rolled strip steel, the rolling mill roll gap is adjusted based on the head-end thickness target moving function and the AGC compensation value; the impact compensation coefficient is determined by the secondary control system based on the parameters of the current to-be-rolled strip steel, and the impact compensation coefficient is issued to the primary control system; the TEGO parameter is determined by the secondary control system based on the parameters of the current to-be-rolled strip steel, and the TEGO parameter is issued to the primary control system; after the number of the strip steels controlled by the relative AGC reaches the preset stable block number corresponding to the current to-be-rolled strip steel, the second instruction is sent from the secondary control system to the primary control system, and the absolute AGC control strategy is switched back.

[0012] The third aspect provides a computer readable storage medium, and the computer readable storage medium stores instructions, when the instructions run on the control device for improving the stability of the finishing rolling strip, the control device for improving the stability of the finishing rolling strip executes the method described in the first aspect and any possible implementation manner of the first aspect.

[0013] In a fourth aspect, a computer program product including instructions, which, when the computer program product runs on the control device for improving the finishing rolling threading stability, causes the control device for improving the finishing rolling threading stability to perform the method described in the first aspect and any possible implementation manner of the first aspect.

[0014] In a fifth aspect, the application provides a control device for improving the finishing rolling threading stability, comprising: a processor and a storage medium; the storage medium includes instructions, and the processor is configured to run the instructions to implement the method described in the first aspect and any possible implementation manner of the first aspect. The control device for improving the finishing rolling threading stability can be an electronic device or a chip in an electronic device.

[0015] In a sixth aspect, the application provides a control system for improving finishing rolling strip entering stability, comprising: a primary control system, a secondary control system and a control device for improving finishing rolling strip entering stability; wherein the primary control system is configured to receive a first instruction issued by the secondary control system, switch the thickness control strategy from absolute AGC to relative AGC, receive a thickness target value issued by the secondary control system, adjust the roll gap of the rolling mill according to the thickness target value, receive an impact compensation coefficient issued by the secondary control system, adjust the rolling mill parameters based on the impact compensation coefficient at the moment of strip biting or strip casting, receive TEGO parameters issued by the secondary control system, analyze the TEGO parameters and extract the TEGO use flag, TEGO rapid roll gap opening degree and TEGO rapid roll gap distance, and perform roll gap opening operation based on the TEGO parameters when the tail of the strip is about to leave the rolling mill, and receive a second instruction issued by the secondary control system to switch the thickness control strategy from relative AGC back to absolute AGC; the secondary control system is configured to obtain the parameters of the current to-be-rolled strip and the previous rolled strip, determine whether to trigger AGC switching based on the difference between the parameters, send the first instruction to the primary control system to switch the thickness control strategy from absolute AGC to relative AGC if AGC switching is triggered, determine the AGC compensation value based on the parameters of the current to-be-rolled strip, obtain the head thickness state of the current to-be-rolled strip through the head thickness target shifting function and determine the head thickness deviation, determine the target shifting value based on the head thickness deviation, calculate the secondary target thickness and issue it to the primary control system, determine the impact compensation coefficient based on the parameters of the current to-be-rolled strip, issue the impact compensation coefficient to the primary control system, determine the TEGO parameters based on the parameter classification of the current to-be-rolled strip, and issue the TEGO parameters to the primary control system; the secondary control system is also configured to count the number of strips rolled with the relative AGC control strategy, and send the second instruction to the primary control system to switch the thickness control strategy from relative AGC back to absolute AGC when the number reaches the preset stable block number corresponding to the current to-be-rolled strip; and the control device for improving finishing rolling strip entering stability is configured to obtain the parameters of the current to-be-rolled strip and the previous rolled strip, and determine whether to trigger AGC switching based on the difference between the parameters; the parameters include SGC, strip thickness and strip width; AGC switching is achieved by the secondary control system sending the first instruction to the primary control system to switch the thickness control strategy from absolute AGC to relative AGC; after AGC switching is triggered, the AGC compensation value is determined based on the parameters of the current to-be-rolled strip, the roll gap of the rolling mill is adjusted based on the AGC compensation value through the head thickness target shifting function; the impact compensation coefficient is determined by the secondary control system based on the parameters of the current to-be-rolled strip, and the impact compensation coefficient is issued to the primary control system; the impact compensation coefficient is used to adjust the rolling mill parameters based on the impact compensation coefficient through the primary control system at the moment of strip biting or strip casting; the TEGO parameters are determined by the secondary control system based on the parameter classification of the current to-be-rolled strip, and the TEGO parameters are issued to the primary control system.The TEGO parameter is used to perform a roll gap opening operation based on the TEGO parameter by a primary control system when the tail of the strip is about to be separated from the rolling mill; after the number of strips controlled by the relative AGC reaches the preset stable block number corresponding to the current strip to be rolled, a second instruction is sent to the primary control system by a secondary control system to switch back to the absolute AGC control strategy.

[0016] The application provides a control method and device for improving finishing rolling strip threading stability, a storage medium and a product, which can solve the problem of head rolling breakage and abnormal head thickness of high-strength thin gauge during finishing rolling strip threading in the prior art; AGC switching is automatically judged to replace manual operation, the roll gap of the rolling mill is adjusted by combining AGC compensation value, the impact compensation coefficient is used to offset the impact load of steel biting / throwing, the tail roll gap is controlled by classifying TEGO parameters, and the absolute AGC is switched back after the number of strips rolled by the relative AGC reaches the preset stable block number, so that the finishing rolling strip threading stability is improved, the finished product thickness precision is ensured, production failures are effectively reduced, and production efficiency and product quality are improved.

[0017] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in the present application does not imply that all features and advantages can be achieved in any single embodiment. On the contrary, it can be understood that the description of a feature or a beneficial effect means that the specific technical feature, technical solution or beneficial effect is included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in the specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the embodiments can be combined in any appropriate manner. Those skilled in the art will understand that the embodiments can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A system architecture diagram of a control system for improving finishing rolling strip threading stability is provided for the embodiments of the present application; Figure 2 A flowchart of a control method for improving finishing rolling strip threading stability is provided for the embodiments of the present application; Figure 3 A flowchart of another control method for improving finishing rolling strip threading stability is provided for the embodiments of the present application; Figure 4 A flowchart of another control method for improving finishing rolling strip threading stability is provided for the embodiments of the present application; Figure 5 A structural diagram of a control device for improving finishing rolling strip threading stability is provided for the embodiments of the present application; Figure 6 This is a schematic diagram of the hardware structure of a control device for improving the stability of precision rolling strip threading, provided in an embodiment of this application. Detailed Implementation

[0019] In the description of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one" means one or more, and "multiple" means two or more. The terms "first," "second," etc., do not limit the quantity or order of execution, and "first," "second," etc., do not necessarily imply differences.

[0020] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0021] The control method for improving the stability of precision rolling and threading provided in this application embodiment can be applied to, for example... Figure 1 The control system shown for improving the stability of precision rolling strip threading includes: a primary control system 101, a secondary control system 102, and a control device 103 for improving the stability of precision rolling strip threading.

[0022] The first-level control system 101 is configured to receive a first instruction issued by the second-level control system, switch the thickness control strategy from absolute AGC to relative AGC, receive a thickness target value issued by the second-level control system, adjust the roll gap of the rolling mill according to the thickness target value, receive an impact compensation coefficient issued by the second-level control system, adjust the parameters of the rolling mill based on the impact compensation coefficient at the moment of strip biting or strip casting, receive TEGO parameters issued by the second-level control system, analyze the TEGO parameters and extract the TEGO use flag, TEGO rapid opening roll gap opening degree and TEGO rapid opening roll gap distance, and perform a roll gap opening operation based on the TEGO parameters when the tail of the strip is about to be separated from the rolling mill, receive a second instruction issued by the second-level control system, and switch the thickness control strategy from relative AGC back to absolute AGC. The second-level control system 102 is configured to obtain the parameters of the current strip to be rolled and the previous rolled strip, determine whether to trigger AGC switching based on the difference between the parameters, send a first instruction to the first-level control system to switch the thickness control strategy from absolute AGC to relative AGC if AGC switching is triggered, determine a AGC compensation value based on the parameters of the current strip to be rolled, obtain the head thickness state of the current strip to be rolled through the head thickness target shifting function and determine the head thickness deviation, determine a target shifting value based on the head thickness deviation, calculate a second-level target thickness and issue it to the first-level control system, determine an impact compensation coefficient based on the parameters of the current strip to be rolled, and issue the impact compensation coefficient to the first-level control system, determine TEGO parameters based on the classification of the parameters of the current strip to be rolled, and issue the TEGO parameters to the first-level control system, count the number of strips rolled with the relative AGC control strategy, and send a second instruction to the first-level control system to switch the thickness control strategy from relative AGC back to absolute AGC when the number reaches a preset stable block number corresponding to the current strip to be rolled. The control device 103 for improving the control of the precision rolling strip passing stability is configured to obtain the parameters of the current strip to be rolled and the previous rolled strip, and determine whether to trigger AGC switching based on the difference between the parameters. After AGC switching is triggered, a AGC compensation value is determined based on the parameters of the current strip to be rolled, the roll gap of the rolling mill is adjusted based on the AGC compensation value through the head thickness target shifting function, an impact compensation coefficient is determined by the second-level control system based on the parameters of the current strip to be rolled, and the impact compensation coefficient is issued to the first-level control system. The impact compensation coefficient is used to adjust the parameters of the rolling mill based on the impact compensation coefficient through the first-level control system at the moment of strip biting or strip casting. TEGO parameters are determined by the second-level control system based on the classification of the parameters of the current strip to be rolled, and the TEGO parameters are issued to the first-level control system. The TEGO parameters are used to perform a roll gap opening operation based on the TEGO parameters through the first-level control system when the tail of the strip is about to be separated from the rolling mill. After the number of strips rolled with the relative AGC control reaches a preset stable block number corresponding to the current strip to be rolled, a second instruction is sent to the first-level control system through the second-level control system to switch back to the absolute AGC control strategy.

[0023] To solve the technical problem of existing technology that head rolling breakage and abnormal head thickness easily occur in the process of finishing rolling and threading when high-strength thin specifications are changed, the embodiment of the present application provides a control method for improving the stability of finishing rolling and threading, which comprises: replacing manual operation by automatically judging AGC switching, adjusting the rolling mill roll gap in combination with AGC switching compensation value, offsetting the biting steel / throwing steel impact load by impact compensation coefficient, controlling the tail roll gap by classifying TEGO parameters, and switching back to absolute AGC when the relative AGC rolling quantity reaches a preset stable block number, which not only improves the stability of finishing rolling and threading, but also guarantees the finished product thickness precision, effectively reduces production failures, improves production efficiency and product quality, and solves the technical problem of existing technology that head rolling breakage and abnormal head thickness easily occur in the process of finishing rolling and threading when high-strength thin specifications are changed.

[0024] Figure 2 The flowchart of the control method for improving the stability of finishing rolling and threading provided by the embodiment of the present application is shown in Figure 2 , which comprises: Step 201, obtaining the parameters of the current to-be-rolled strip steel and the previous rolled strip steel, and judging whether to trigger AGC switching by the difference of the parameters.

[0025] Among them, the parameters include SGC (steel grade code), strip steel thickness, and strip steel width, AGC switching refers to sending a first instruction from the secondary control system to the primary control system to switch the thickness control strategy from absolute AGC to relative AGC; the situation of triggering AGC switching is the first steel meeting condition A1, and the Nth steel after the first steel not meeting condition A1, the value range of N is 0-2, and the value of N is dynamically adjusted according to the specifications and interval difference of the strip steel, the greater the width of the strip steel and the thinner the thickness, the greater the value of N; the greater the absolute value of the difference between the current thickness interval identifier and the previous thickness interval identifier, or the greater the absolute value of the difference between the current width interval identifier and the previous width interval identifier, the greater the value of N; condition A1 is that the SGC of the current strip steel is different from the SGC of the previous strip steel, or the current thickness interval identifier is different from the previous thickness interval identifier, or the current width interval identifier is different from the previous width interval identifier.

[0026] In the embodiment of the present application, the control device for improving the finishing strip threading stability first acquires the parameters of the current to-be-rolled strip and the previous rolled strip, then matches the thickness of the current to-be-rolled strip and the previous rolled strip to the preset thickness interval respectively to obtain the current thickness interval identifier and the previous thickness interval identifier; matches the width of the current to-be-rolled strip and the previous rolled strip to the preset width interval to obtain the current width interval identifier and the previous width interval identifier; then judges whether the current strip is the first steel satisfying condition A1 or the Nth steel after the first steel satisfying condition A1: if the current strip satisfies condition A1 and is the first steel satisfying condition A1, or the current strip is the Nth steel after the first steel satisfying condition A1 (N is in the range of 0-2, and N is adjusted according to the strip width, thickness and interval difference), it is determined that the AGC switching is triggered; if none of the above conditions is met, it is determined that the AGC switching is not triggered.

[0027] As an example, the current strip SGC is 2, the thickness is matched to (1.15, 1.3] (identifier 2), and the width is matched to (1100, 1200] (identifier 3); the previous strip SGC is 1, the thickness is matched to (0, 1.15] (identifier 1), and the width is matched to (1000, 1100] (identifier 2); the current strip satisfies condition A1 and is the first steel satisfying condition A1, and it is determined that the AGC switching is triggered; the subsequent one strip (second) SGC is 2, the thickness is matched to (1.15, 1.3] (identifier 2), and the width is matched to (1100, 1200] (identifier 3); compared with the previous one (the first steel satisfying condition A1), it does not satisfy condition A1, but because the strip width is large, the thickness is thin, and the width interval identifier difference is 1 (the previous identifier 2, the current identifier 3, the absolute value of the difference is 1), N=1 is taken, and it is determined that the AGC switching is triggered.

[0028] It should be noted that identifiers 1, 2 and 3 are classification marks for the preset thickness interval or the preset width interval, which are used to quickly distinguish the range category to which the strip thickness / width belongs.

[0029] Based on the above steps, the AGC switching requirements of multiple strips in the specification transition stage can be flexibly covered, the switching of the first different steel is accurately triggered, the threading stability of the subsequent steel is ensured through the N value, and frequent switching or missed switching is avoided.

[0030] In step 202, after the AGC switching is triggered, the cut AGC compensation value is determined based on the parameters of the previous to-be-rolled strip, and the roll gap of the rolling mill is adjusted based on the cut AGC compensation value through the head-end thickness target shifting function.

[0031] The cut AGC compensation value is a statistical value of the head-end thickness anomaly of the same parameter specification strip after switching to the relative AGC, and the head-end thickness target shifting function is used to optimize the head-end thickness by adjusting the thickness target value.

[0032] In the embodiment of the present application, after the control device for improving the stability of the finishing rolling strip triggering AGC switching, the AGC compensation value derived from big data statistics is retrieved based on the current strip parameters, and then the current strip head thickness state is obtained through the head thickness shift target function, the thickness deviation is determined, the shift target value is calculated based on the thickness deviation, if AGC switching has been triggered, the basic thickness target value corresponding to the shift target value is reduced by the AGC compensation value as the secondary target thickness; if AGC switching has not been triggered, the basic thickness target value corresponding to the shift target value is taken as the secondary target thickness, and finally the secondary target thickness is issued to the primary control system to adjust the roll gap of the rolling mill.

[0033] As an example, if the AGC compensation value corresponding to the current strip parameters is 0.1 mm, and the basic thickness target value corresponding to the shift target value is 2.0 mm, after triggering AGC switching, the secondary target thickness is 1.9 mm, and the roll gap is adjusted after issuing.

[0034] Based on the above steps, the abnormal head thickness caused by AGC switching can be effectively eliminated, and the head thickness precision can be improved.

[0035] Step 203, determine the impact compensation coefficient through the secondary control system combined with the parameters of the current strip to be rolled, and issue the impact compensation coefficient to the primary control system.

[0036] In the embodiment of the present application, the control device for improving the stability of the finishing rolling strip retrieves the pre-stored impact compensation coefficient parameter table through the secondary control system, matches the corresponding coefficient based on the current strip parameters, if AGC switching has been triggered, calculates the final coefficient according to "original impact compensation coefficient x (1+ matching coefficient)", otherwise directly uses the original coefficient, and then issues the final coefficient to the primary control system.

[0037] It should be noted that the impact compensation coefficient value range is 0-10%, and the impact roll mark after adjustment should be avoided.

[0038] As an example, if the impact compensation coefficient matched by the current strip parameters is 5%, and the original coefficient is 0.8, then the final coefficient is 0.8x1.05=0.84 after triggering AGC switching, and is issued to the primary system.

[0039] Based on the above steps, the rolling mill parameter adjustment at the instant of biting steel / throwing steel can be provided, and the thickness fluctuation caused by impact can be reduced.

[0040] Step 204, determine the TEGO parameter through the secondary control system combined with the parameters of the current strip to be rolled, and issue the TEGO parameter to the primary control system.

[0041] The TEGO parameter includes TEGO use mark, TEGO fast opening roll gap opening, and TEGO fast opening roll gap distance, which is used for controlling the opening of the roll gap when the strip tail is separated.

[0042] In the embodiment of the present application, the control device for improving the stability of the finishing strip threading calls the pre-stored TEGO parameter table through the secondary control system, the table takes the strip parameters as the classification dimension, matches the consistent TEGO parameters based on the current strip parameters, confirms the parameters including the use mark, the opening and the distance, and then issues them to the primary control system.

[0043] It should be noted that the TEGO parameters need to be set according to the strip specifications to avoid the poor adaptability of the general parameters.

[0044] As an example, if the current strip SGC is 3, the thickness is (1.3, 1.5], and the width is (1050, 1180], the corresponding TEGO parameters are matched: the use mark is "enabled", the opening is 2mm, and the distance is 500mm, which are issued to the primary system.

[0045] Based on the above steps, the tail roll gap opening parameters can be set specifically to reduce the thickening of the strip tail.

[0046] Step 205, after the number of strips controlled by the relative AGC reaches the preset stable block number corresponding to the current strip to be rolled, a second instruction is sent to the primary control system through the secondary control system to switch back to the absolute AGC control strategy.

[0047] The preset stable block number refers to the number of blocks that need to be rolled after the strip is switched to the relative AGC, and the absolute AGC can be switched back when the number reaches this value.

[0048] In the embodiment of the present application, the control device for improving the stability of the finishing strip threading counts the number of the current specification strips rolled by the relative AGC through the secondary control system, generates a second instruction to switch back to the absolute AGC when the number reaches the preset stable block number corresponding to the current strip, and issues it to the primary control system, and the primary system switches the control strategy after receiving it.

[0049] It should be noted that the preset stable block number needs to be set based on the strip specifications, and different specifications correspond to different block numbers.

[0050] As an example, if the preset stable block number of the current strip is 3, the secondary system sends a second instruction to switch back to the absolute AGC when 3 blocks of the specification strip are rolled by the relative AGC.

[0051] Based on the above steps, high-precision control can be restored after ensuring production stability, taking into account stability and finished product precision.

[0052] Based on the above technical solution, a complete precision rolling threading control process is formed by automatically judging AGC switching, specifically compensating for head thickness, adapting impact compensation coefficient, classifying and setting TEGO parameters, and switching back to absolute AGC as needed. This effectively solves the problems of head breakage and abnormal thickness when changing specifications for high-strength thin specifications, improves threading stability and product accuracy, and reduces production failures.

[0053] In one possible implementation, combining the above... Figure 2 ,like Figure 3 As shown, the specific process of adjusting the mill parameters based on the impact compensation coefficient by the primary control system in step 203 above at the moment of strip biting or throwing can be achieved through the following steps 301-302: Step 301: At the moment when the head of the strip to be rolled enters the rolling mill or the tail leaves the rolling mill, the impact compensation coefficient issued by the secondary control system is received and called in real time through the primary control system.

[0054] Among them, "steel biting" refers to the head of the strip entering the rolling mill, "steel throwing" refers to the tail of the strip leaving the rolling mill, and the impact compensation coefficient is a coefficient determined by the secondary control system based on the strip parameters to offset the impact load.

[0055] In this embodiment, the control device for improving the stability of strip threading in precision rolling works in conjunction with the primary control system to monitor the current position of the strip to be rolled in real time. When the moment when the head of the strip enters the mill or the tail leaves the mill is detected, the primary control system immediately receives and calls the impact compensation coefficient previously issued by the secondary control system that matches the current strip parameters.

[0056] It should be noted that the primary control system must ensure the timely receipt and retrieval of the impact compensation coefficient to avoid missing the opportunity to respond to the impact load due to delays.

[0057] Based on the above steps, the impact compensation coefficient can be quickly activated at critical moments, providing a basis for subsequent mill parameter adjustments.

[0058] Step 302: Based on the impact compensation coefficient, the mill parameters are dynamically adjusted through the primary control system.

[0059] Among them, the mill parameters include at least one of the mill roll gap, rolling speed, and hydraulic reduction, and dynamic adjustment refers to optimizing the parameter values ​​in real time according to the impact compensation coefficient.

[0060] In the embodiments of this application, the control device for improving the stability of the finishing strip threading causes the primary control system to dynamically adjust the mill roll gap, rolling speed or hydraulic reduction based on the impact compensation coefficient, such as increasing or decreasing the roll gap opening or adjusting the rolling speed according to the coefficient to adapt to changes in impact load.

[0061] It should be noted that the parameter adjustment needs to be controlled within a reasonable range to avoid impact roller printing or strip thickness deviation due to excessive adjustment.

[0062] As an example, if the impact compensation coefficient is 5%, the primary control system adjusts the original roll gap of the rolling mill from 1.2 mm to 1.3 mm to offset the rolling force impact during the biting instant by increasing the roll gap.

[0063] Based on the above steps, the impact load can be targetedly offset, and the strip thickness fluctuation and rolling mill equipment vibration can be reduced.

[0064] Based on the above technical solution, by timely calling the impact compensation coefficient during the biting / throwing instant and dynamically adjusting the rolling mill parameters, the impact load caused by the sudden change of rolling force can be effectively dealt with, the risk of strip thickness fluctuation and equipment vibration can be significantly reduced, and the stability of the finishing rolling process can be further ensured.

[0065] In a possible implementation manner, the above Figure 2 As shown in Figure 4 The specific process of the roll gap opening operation performed by the primary control system based on the TEGO parameters when the strip tail is about to leave the rolling mill can be implemented through the following steps 401-403: Step 401: Analyzing the TEGO parameters issued by the secondary control system through the primary control system, and extracting the TEGO use flag, TEGO fast opening roll gap size and TEGO fast opening roll gap distance.

[0066] Among them, the TEGO use flag is used to determine whether to enable the TEGO function, the TEGO fast opening roll gap size refers to the target size of the roll gap to be opened, and the TEGO fast opening roll gap distance refers to the preset triggering distance of the strip tail to the rolling mill outlet.

[0067] In the embodiments of the present application, the control device for improving the stability of the finishing rolling process cooperates with the primary control system to receive the TEGO parameters issued by the secondary control system, and the primary control system analyzes the parameters to accurately extract the TEGO use flag, TEGO fast opening roll gap size and TEGO fast opening roll gap distance from the parameters.

[0068] As an example, if the TEGO parameters issued by the secondary system are “use flag: enabled, fast opening roll gap size: 2.0 mm, fast opening roll gap distance: 500 mm”, the corresponding three information can be extracted after the primary system analyzes.

[0069] Based on the above steps, the key parameters for performing the roll gap opening operation can be obtained, laying a foundation for subsequent accurate control.

[0070] Step 402, if the TEGO use flag is enabled, the tail position information of the current strip to be rolled is acquired in real time by the primary control system, and it is judged whether the strip tail reaches the preset position about to be separated from the rolling mill.

[0071] The preset position refers to the position of the strip tail matched with the TEGO quick opening roll gap distance, that is, the position when the distance between the strip tail and the outlet of the rolling mill is equal to the TEGO quick opening roll gap distance.

[0072] In the embodiment of the present application, the control device for improving the stability of the finishing rolling strip passing improves the stability of the finishing rolling strip passing. First, the TEGO use flag state is confirmed by the primary control system. If the flag is "enabled", the primary control system is controlled to collect the tail position data of the current strip to be rolled in real time, and then the collected position information is compared with the preset position to determine whether the strip tail reaches the preset position.

[0073] As an example, if the TEGO quick opening roll gap distance is 500 mm and the preset position is 500 mm away from the outlet of the rolling mill, the primary system monitors that the tail is 500 mm away from the outlet, and determines that the preset position is reached.

[0074] Based on the above steps, the trigger timing of the roll gap opening can be accurately determined to avoid premature or late opening.

[0075] Step 403, when the strip tail reaches the preset position, the primary control system is used to control the rolling mill to open the roll gap according to the TEGO quick opening roll gap opening degree, maintain the opening degree until the strip tail completely separates, and then reset the roll gap to the normal rolling opening degree.

[0076] The normal rolling opening degree refers to the roll gap size of the rolling mill in the normal rolling process of the strip, which is distinguished from the TEGO quick opening roll gap opening degree.

[0077] In the embodiment of the present application, the control device for improving the stability of the finishing rolling strip passing controls the primary control system to drive the rolling mill to perform the roll gap opening operation according to the extracted TEGO quick opening roll gap opening degree when the primary control system determines that the strip tail reaches the preset position, so that the roll gap is adjusted to the opening degree and maintained until it is monitored that the strip tail completely separates from the rolling mill, and then the primary control system is controlled to reset the roll gap to the normal rolling opening degree.

[0078] It should be noted that the roll gap maintenance needs to be continued until the tail completely separates, and the reset operation needs to be timely to not affect the subsequent strip rolling.

[0079] As an example, if the TEGO quick opening roll gap opening degree is 2.0 mm and the normal rolling opening degree is 1.2 mm, the primary system controls the rolling mill to open the roll gap to 2.0 mm, and then adjusts the roll gap back to 1.2 mm after the tail separates.

[0080] Based on the above steps, the tail thickening phenomenon of the strip steel can be effectively inhibited, and the subsequent rolling can be normally performed.

[0081] Based on the above technical scheme, by analyzing the TEGO parameter, accurately judging the triggering opportunity, and standardizing the execution of the roll gap opening and resetting actions, accurate roll gap control in the strip steel tail separation stage is realized, the tail thickening problem is effectively reduced, and the stability of the finishing rolling threading process and the quality of the strip steel finished product are further improved.

[0082] The above mainly introduces the scheme of the embodiments of the present application from the perspective of device implementation. It can be understood that each device, for example, the control device for improving the stability of the finishing rolling threading, contains at least one of the corresponding hardware structure and software module for executing each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driven hardware depends on the specific application and design constraints of the technical scheme. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0083] The embodiments of the present application can divide the functional units of the control device for improving the stability of the finishing rolling threading according to the above method examples, for example, each functional unit can be divided according to each function, or two or more functions can be integrated in one processing unit. The integrated unit can be realized in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical functional division. When actually implemented, there can be another division method.

[0084] In the case of using integrated units, Figure 5 A possible structure schematic diagram of the control device for improving the stability of the finishing rolling threading (denoted as a control device for improving the stability of the finishing rolling threading 50) involved in the above embodiments is shown, which includes a processing unit 501 and a communication unit 502, and can also include a storage unit 503. Figure 5 The structure schematic diagram shown can be used to illustrate the structure of the control device for improving the stability of the finishing rolling threading involved in the above embodiments.

[0085] When Figure 5The illustrated structural schematic is used to illustrate the structure of the control device for improving the finishing strip threading stability involved in the above embodiments, the processing unit 501 is used to control and manage the action of the control device for improving the finishing strip threading stability, the communication unit 502 is used for the control device for improving the finishing strip threading stability and other equipment communication, the storage unit 503 is used to store the program code and data of the control device for improving the finishing strip threading stability.

[0086] For example, the communication unit 502 is used to obtain the parameters of the current to-be-rolled strip and the previous rolled strip; The processing unit 501 is used to determine whether to trigger AGC switching by the difference of the parameters; the AGC switching is to send a first instruction from the secondary control system to the primary control system, and switch the thickness control strategy from absolute AGC to relative AGC; after triggering the AGC switching, the AGC compensation value is determined based on the parameters of the current to-be-rolled strip, the head-end thickness target shifting function is used to adjust the roll gap of the rolling mill based on the AGC compensation value; the impact compensation coefficient is determined by the secondary control system combined with the parameters of the current to-be-rolled strip, and the impact compensation coefficient is sent to the primary control system; the TEGO parameters are determined by the secondary control system combined with the parameter classification of the current to-be-rolled strip, and the TEGO parameters are sent to the primary control system; after the number of strips controlled by the relative AGC reaches the preset stable block number corresponding to the current to-be-rolled strip, a second instruction is sent from the secondary control system to the primary control system to switch back to the absolute AGC control strategy.

[0087] In a possible implementation, the processing unit 501 is further used to determine whether to trigger AGC switching by the difference between the parameters of the current to-be-rolled strip and the previous rolled strip, including: respectively matching the strip thicknesses of the current to-be-rolled strip and the previous rolled strip to a preset thickness interval to obtain a current thickness interval identifier and a previous thickness interval identifier; matching the strip widths of the current to-be-rolled strip and the previous rolled strip to a preset width interval to obtain a current width interval identifier and a previous width interval identifier; the preset thickness interval is divided according to the line capacity and the common rolling thickness range; the preset width interval is divided according to the line capacity and the common rolling width range; the condition for triggering AGC switching is that the first block of steel satisfies condition A1, and the Nth block of steel after the first block of steel does not satisfy condition A1; the condition A1 is that the current strip SGC is different from the previous strip SGC, or the current thickness interval identifier is different from the previous thickness interval identifier, or the current width interval identifier is different from the previous width interval identifier; the value adjustment rule of N is that the greater the strip width and the thinner the thickness, the greater the value of N.

[0088] In a possible implementation, the processing unit 501 is further configured to, after triggering the AGC switching, determine a cut AGC compensation value based on parameters of the front strip to be rolled, and adjust the rolling mill roll gap based on the cut AGC compensation value by using a head thickness target shifting function, including: based on the parameters of the current strip to be rolled, retrieving a cut AGC compensation value obtained by statistically analyzing the head thickness data of the strip after switching to the relative AGC by using the same parameter specification strip; the cut AGC compensation value is an abnormal statistical value of the head thickness after the parameter specification strip switches to the relative AGC; obtaining the head thickness state of the current strip to be rolled by using the head thickness target shifting function, and determining the head thickness deviation of the strip according to the head thickness state; determining a target shifting value based on the head thickness deviation by using the secondary control system, if the AGC switching has been triggered, subtracting the cut AGC compensation value from the basic thickness target value corresponding to the target shifting value to obtain the secondary target thickness; if the AGC switching has not been triggered, taking the basic thickness target value corresponding to the target shifting value as the secondary target thickness; and sending the secondary target thickness to the primary control system by using the secondary control system, and adjusting the rolling mill roll gap according to the secondary target thickness by using the primary control system.

[0089] In a possible implementation, the processing unit 501 is further configured to determine an impact compensation coefficient by using the secondary control system in combination with the parameters of the current strip to be rolled, including: retrieving a pre-stored impact compensation coefficient parameter table in the secondary control system; the parameter table stores impact compensation coefficients corresponding to different parameter specification strips in a classification dimension of parameters of the strip; based on the parameters of the current strip to be rolled, matching the corresponding impact compensation coefficient from the impact compensation coefficient parameter table; if the AGC switching has been triggered, determining the final impact compensation coefficient as the original impact compensation coefficient*(1+the impact compensation coefficient); if the AGC switching has not been triggered, determining the final impact compensation coefficient as the original impact compensation coefficient.

[0090] In a possible implementation, the processing unit 501 is further configured to determine the TEGO parameter by using the secondary control system in combination with the parameter classification of the current strip to be rolled, including: retrieving a pre-stored TEGO parameter table in the secondary control system; the TEGO parameter table stores TEGO parameters corresponding to different parameter specification strips in a classification dimension of parameters of the strip; the TEGO parameter includes a TEGO use flag, a TEGO fast opening roll gap opening, and a TEGO fast opening roll gap distance; based on the parameters of the current strip to be rolled, matching the TEGO parameter consistent with the specification of the current strip to be rolled from the TEGO parameter table to determine the TEGO parameter of the current strip to be rolled.

[0091] In a possible implementation, the processing unit 501 is further configured to, at the moment of strip biting or strip casting, adjust the rolling mill parameters based on the impact compensation coefficient by the primary control system, including: at the moment of the head of the current strip to be rolled entering the rolling mill or the tail of the strip leaving the rolling mill, the primary control system receives and calls the impact compensation coefficient issued by the secondary control system in real time; based on the impact compensation coefficient, the primary control system dynamically adjusts the rolling mill parameters; the rolling mill parameters include the rolling mill gap, the rolling speed, and the hydraulic reduction amount.

[0092] In a possible implementation, the processing unit 501 is further configured to, at the moment when the tail of the strip is about to leave the rolling mill, perform the gap opening operation based on the TEGO parameter by the primary control system, including: the primary control system analyzes the TEGO parameter issued by the secondary control system, and extracts the TEGO use flag, the TEGO fast opening gap opening degree, and the TEGO fast opening gap distance; if the TEGO use flag is enabled, the primary control system obtains the position information of the tail of the current strip to be rolled in real time, and judges whether the tail of the strip reaches the preset position of leaving the rolling mill; when the tail of the strip reaches the preset position, the primary control system controls the rolling mill to open the gap according to the TEGO fast opening gap opening degree, maintains the opening degree until the tail of the strip completely leaves, and then resets the gap to the normal rolling opening degree.

[0093] The processing unit 501 can be a processor or a controller, and the communication unit 502 can be a communication interface, a transceiver, a transceiver, a transceiver circuit, a transceiver device, or the like. The communication interface is a general term and can include one or more interfaces. The storage unit 503 can be a memory. When the control device 50 for improving the finishing rolling strip stability is a chip, the processing unit 501 can be a processor or a controller, the communication unit 502 can be an input interface and / or an output interface, a pin or a circuit, and the like. The storage unit 503 can be a storage unit (for example, a register, a cache, or the like) in the chip, or can be a storage unit (for example, a read-only memory (ROM), a random access memory (RAM), or the like) located outside the chip.

[0094] The communication unit can also be referred to as a transceiver unit. The antenna and the control circuit with the transceiver function in the control device 50 for improving the finishing rolling threading stability can be regarded as a communication unit 502 of the control device 50 for improving the finishing rolling threading stability, and the processor with the processing function can be regarded as a processing unit 501 of the control device 50 for improving the finishing rolling threading stability. Alternatively, the device for realizing the receiving function in the communication unit 502 can be regarded as a communication unit, the communication unit is used for executing the receiving steps in the embodiments of the present application, and the communication unit can be a receiver, a receiver, a receiving circuit, etc. The device for realizing the sending function in the communication unit 502 can be regarded as a sending unit, the sending unit is used for executing the sending steps in the embodiments of the present application, and the sending unit can be a transmitter, a transmitter, a sending circuit, etc.

[0095] Figure 5 The integrated units in the above embodiments can be stored in a computer readable storage medium if they are realized in the form of software function modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present application or the part of the prior art that essentially contributes or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the method described in the embodiments of the present application. The storage medium for storing the computer software product includes a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various media that can store program codes.

[0096] Figure 5 The units in the above embodiments can also be referred to as modules, for example, the processing unit can be referred to as a processing module.

[0097] The embodiments of the present application also provide a hardware structure diagram of a control device for improving the finishing rolling threading stability (denoted as a control device 60 for improving the finishing rolling threading stability), which is shown in Figure 6 The control device 60 for improving the finishing rolling threading stability includes a processor 601, and optionally, a memory 602 connected with the processor 601.

[0098] In the first possible implementation, referring to Figure 6The control device 60 for improving finishing threading stability further comprises a transceiver 603. The processor 601, the memory 602 and the transceiver 603 are connected through a bus. The transceiver 603 is configured to communicate with other devices or communication networks. Optionally, the transceiver 603 can comprise a transmitter and a receiver. The device in the transceiver 603 for realizing the receiving function can be regarded as a receiver, and the receiver is configured to perform the receiving steps in the embodiments of the present application. The device in the transceiver 603 for realizing the sending function can be regarded as a transmitter, and the transmitter is configured to perform the sending steps in the embodiments of the present application.

[0099] Based on the first possible implementation, Figure 6 The structural schematic diagram shown can be used to show the structure of the control device for improving finishing threading stability involved in the above embodiments.

[0100] In the above embodiments, the control device for improving finishing threading stability can be implemented by a system chip. In this case, the actions performed by the control device for improving finishing threading stability can be realized by the system chip, and the specific actions can be referred to the above and will not be described here. Figure 6 The system chip in the control device for improving finishing threading stability can also be shown. In this case, the actions performed by the control device for improving finishing threading stability can be realized by the system chip, and the specific actions can be referred to the above and will not be described here.

[0101] In the implementation process, each step in the method provided by the embodiments can be completed by the integrated logic circuit of hardware in the processor or the instructions in the form of software. The steps of the method disclosed in the embodiments of the present application can be directly embodied as hardware processor execution completion, or executed by the combination of hardware and software modules in the processor.

[0102] The processor in the present application can include, but is not limited to, at least one of the following: a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a microcontroller unit (MCU), or an artificial intelligence processor, and the like, each of which is a computing device running software, and each of which can include one or more cores for executing software instructions to perform operations or processing. The processor can be a separate semiconductor chip, or can be integrated with other circuits as a semiconductor chip, for example, can be integrated with other circuits (such as coding and decoding circuits, hardware acceleration circuits, or various bus and interface circuits) to form a SoC (system on chip), or can be integrated as a built-in processor in an ASIC. The ASIC integrated with the processor can be packaged separately or packaged together with other circuits. In addition to including cores for executing software instructions to perform operations or processing, the processor can further include necessary hardware accelerators, such as field programmable gate arrays (FPGAs), PLDs (programmable logic devices), or logic circuits implementing special logic operations.

[0103] The memory in the embodiments of the present application can include at least one of the following types: a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM). In some scenarios, the memory can also be a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

[0104] The embodiments of the present application also provide a computer readable storage medium including instructions, which, when executed on a computer, cause the computer to perform any of the above methods.

[0105] The embodiments of the present application also provide a computer program product including instructions, which, when executed on a computer, cause the computer to perform any of the above methods.

[0106] The embodiment of the present application further provides a chip, comprising a processor and an interface circuit, the interface circuit being coupled with the processor, the processor being used to run computer programs or instructions to realize the method described above, and the interface circuit being used to communicate with other modules outside the chip.

[0107] In the above embodiments, the implementation can be achieved by software, hardware, firmware or any combination thereof, entirely or partially. When implemented by software, the implementation can be achieved in the form of a computer program product, entirely or partially. The computer program product comprises one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the flow or function described in the embodiments of the present application is generated, entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (for example, coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (for example, infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be any available medium that can be accessed by a computer or data storage device including one or more servers, data centers, etc. integrated with the medium. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, solid state disk (solid state disk, SSD)) and the like.

[0108] Although the present application is described herein in conjunction with various embodiments, other variations of the disclosed embodiments can be understood and implemented by those skilled in the art with reference to the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. Some measures described in mutually different dependent claims can be combined and produce a good result.

[0109] Although the present application has been described in connection with certain specific features and embodiments thereof, it is to be understood that it is provided as an exemplification of the application and is not intended to limit the scope of the application, which is defined in the claims. Various modifications and changes can be made thereto without departing from the spirit and scope of the application. Accordingly, it is intended that all such modifications and changes be included within the scope of the application as claimed. Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A control method for improving finishing threading stability, characterized by, The method comprises: obtaining parameters of a current to-be-rolled strip and a previous rolled strip, and determining whether to trigger AGC switching based on the difference between the parameters; the parameters include SGC, strip thickness and strip width; the AGC switching is sending a first instruction from a secondary control system to a primary control system to switch the thickness control strategy from absolute AGC to relative AGC; after triggering AGC switching, determining a cut AGC compensation value based on the parameters of the current to-be-rolled strip, and adjusting the roll gap of the rolling mill based on the cut AGC compensation value through the head-end thickness target shifting function; determining an impact compensation coefficient based on the parameters of the current to-be-rolled strip through the secondary control system, and sending the impact compensation coefficient to the primary control system; the impact compensation coefficient is used to adjust the rolling mill parameters based on the impact compensation coefficient through the primary control system at the moment of strip biting or throwing; determining TEGO parameters based on the parameters of the current to-be-rolled strip through the secondary control system, and sending the TEGO parameters to the primary control system; the TEGO parameters are used to perform roll gap opening operation based on the TEGO parameters through the primary control system when the tail of the strip is about to leave the rolling mill; after the number of strips rolled under relative AGC control reaches the preset stable block number corresponding to the current to-be-rolled strip, sending a second instruction from the secondary control system to the primary control system to switch back to the absolute AGC control strategy.

2. The method of claim 1, wherein, The determination of whether to trigger AGC switching based on the difference between the parameters of the current to-be-rolled strip and the previous rolled strip comprises: matching the strip thicknesses of the current to-be-rolled strip and the previous rolled strip to preset thickness intervals to obtain current thickness interval identifiers and previous thickness interval identifiers; matching the strip widths of the current to-be-rolled strip and the previous rolled strip to preset width intervals to obtain current width interval identifiers and previous width interval identifiers; the preset thickness intervals are divided according to the production line capacity and the range of common rolling thickness; the preset width intervals are divided according to the production line capacity and the range of common rolling width; the condition for triggering AGC switching is that the first block of steel meets condition A1, and the Nth block of steel after the first block of steel does not meet condition A1; condition A1 is that the SGC of the current strip is different from the SGC of the previous strip, or the current thickness interval identifier is different from the previous thickness interval identifier, or the current width interval identifier is different from the previous width interval identifier; the value of N is adjusted according to the rule that the wider the strip width and the thinner the strip thickness, the larger the value of N.

3. The method of claim 1, wherein, After triggering AGC switching, determining a cut AGC compensation value based on the parameters of the previous to-be-rolled strip, and adjusting the roll gap of the rolling mill based on the cut AGC compensation value through the head-end thickness target shifting function, comprises: based on the parameters of the current to-be-rolled strip, retrieving the cut AGC compensation value obtained by statistically analyzing the head-end thickness data of the same parameter specification strip switched to relative AGC; the cut AGC compensation value is the statistical value of the head-end thickness after the parameter specification strip is switched to relative AGC. The head thickness state of the current strip to be rolled is obtained by a head thickness shift function, and the head thickness deviation of the strip is determined according to the head thickness state; The shift target value is determined based on the head thickness deviation by a secondary control system, and if the AGC switching has been triggered, the basic thickness target value corresponding to the shift target value is reduced by the AGC compensation value as the secondary target thickness; if the AGC switching has not been triggered, the basic thickness target value corresponding to the shift target value is taken as the secondary target thickness; The secondary target thickness is sent to a primary control system by the secondary control system, and the roll gap of the rolling mill is adjusted by the primary control system according to the secondary target thickness.

4. The method of claim 1, wherein, The impact compensation coefficient is determined by the secondary control system in combination with the parameters of the current strip to be rolled, including: The pre-stored impact compensation coefficient parameter table is called in the secondary control system; the parameter table takes the parameters of the strip as the classification dimension, and stores the impact compensation coefficients corresponding to different parameter specifications of the strip; The corresponding impact compensation coefficient is matched from the impact compensation coefficient parameter table based on the parameters of the current strip to be rolled; If the AGC switching has been triggered, the final impact compensation coefficient is determined as the original impact compensation coefficient × (1 + impact compensation coefficient); if the AGC switching has not been triggered, the final impact compensation coefficient is determined as the original impact compensation coefficient.

5. The method of claim 1, wherein, The TEGO parameter is determined by the secondary control system in combination with the parameter classification of the current strip to be rolled, including: The pre-stored TEGO parameter table is called in the secondary control system; the TEGO parameter table takes the parameters of the strip as the classification dimension, and stores the TEGO parameters corresponding to different parameter specifications of the strip; the TEGO parameters include TEGO use flag, TEGO quick opening roll gap opening, and TEGO quick opening roll gap distance; The TEGO parameter consistent with the specification of the current strip to be rolled is matched from the TEGO parameter table based on the parameters of the current strip to be rolled, and the TEGO parameter of the current strip to be rolled is determined.

6. The method of claim 4, wherein, The rolling mill parameters are adjusted by the primary control system based on the impact compensation coefficient at the moment when the strip is bitten or thrown, including: At the moment when the head of the current strip to be rolled enters the rolling mill or the tail of the strip is separated from the rolling mill, the impact compensation coefficient sent by the secondary control system is received and called by the primary control system in real time; The rolling mill parameters are dynamically adjusted by the primary control system based on the impact compensation coefficient; the rolling mill parameters include the roll gap of the rolling mill, the rolling speed, and the hydraulic reduction amount.

7. The method of claim 5, wherein, The roll gap opening action is performed by the primary control system based on the TEGO parameter at the moment when the tail of the strip is about to be separated from the rolling mill, including: The TEGO parameter sent by the secondary control system is analyzed by the primary control system, and the TEGO use flag, TEGO quick opening roll gap opening, and TEGO quick opening roll gap distance are extracted; If the TEGO use flag is enabled, the tail position information of the current strip to be rolled is obtained by the primary control system in real time, and it is judged whether the tail of the strip reaches the preset position about to be separated from the rolling mill; When the tail of the strip reaches the preset position, the opening of the roll gap of the rolling mill is controlled by the first control system according to the TEGO speed, the opening is maintained until the tail of the strip is completely separated, and then the roll gap is reset to the normal rolling opening.

8. A control device for improving the stability of precision rolling strip threading, characterized in that, The device comprises a communication unit and a processing unit; The communication unit is configured to acquire parameters of a current strip to be rolled and a previous rolled strip; The processing unit is configured to determine whether to trigger AGC switching based on differences between the parameters, wherein the parameters include SGC, strip thickness, and strip width; the AGC switching is switching the thickness control strategy from absolute AGC to relative AGC by sending a first instruction from the second control system to the first control system; after triggering the AGC switching, determining a cut AGC compensation value based on the parameters of the current strip to be rolled, adjusting the roll gap of the rolling mill based on the cut AGC compensation value by using the head-end thickness target shifting function; determining an impact compensation coefficient based on the parameters of the current strip to be rolled by using the second control system, and sending the impact compensation coefficient to the first control system; the impact compensation coefficient is used to adjust the parameters of the rolling mill based on the impact compensation coefficient by using the first control system at the moment of strip biting or strip casting; determining TEGO parameters based on the parameters of the current strip to be rolled by using the second control system, and sending the TEGO parameters to the first control system; the TEGO parameters are used to perform roll gap opening operation based on the TEGO parameters by using the first control system when the tail of the strip is about to be separated from the rolling mill; after the number of strips rolled by using the relative AGC reaches a preset stable block number corresponding to the current strip to be rolled, sending a second instruction from the second control system to the first control system to switch back to the absolute AGC control strategy.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores instructions, and when the instructions run on the control device for improving finishing rolling strip stability, the control device for improving finishing rolling strip stability executes the method of any one of claims 1-7.

10. A computer program product comprising instructions, characterized in that, The computer program product runs on the control device for improving finishing rolling strip stability, and the control device for improving finishing rolling strip stability executes the method of any one of claims 1-7.

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