A tail-dropping correction control system based on inter-frame deviation detection and its use method

Abstract

The present invention discloses a tail-throwing correction control system based on inter-stand deviation detection and a method for use, and relates to the technical field of hot-rolled strip. The tail-throwing correction control system based on inter-stand deviation detection includes a communication processing module, the communication processing module is electrically connected to a data processing module, and the data processing module is electrically connected to an alarm module and a tail dynamic tracking module. The tail-throwing correction control system based on inter-stand deviation detection and a method for use is based on the principle of calculating the dynamic adjustment value of the roll gap of the next stand through the position information of the strip tail measured between the stands, achieving rapid correction of the strip tail offset, reducing the probability of tail-throwing, and using the strip width measuring equipment installed on the post-finishing stand and the finishing mill outlet to measure the actual rolling position in the strip stand and the rolling force changes measured during the rolling process, developing a corresponding algorithm model, and dynamically adjusting and controlling the mill roll gap, so that the strip is always rolled on the center line of the finishing stand.

Description

Technical Field

[0001] The present invention relates to the technical field of hot-rolled strips, and in particular to a tail-dropping and deviation-correcting control system based on inter-stand deviation detection and a use method thereof. Background Art

[0002] When the tail of the strip passes through the finishing mill, excessive camber at the tail of the intermediate billet and a sudden loss of tension after the front stand throw can lead to a sudden increase in rolling force. This can cause deviation, buckling, and tail swinging, resulting in minor quality defects and, in more serious cases, scrap. Currently, inter-stand deviation detection and correction control relies solely on industrial television images, which has very low accuracy. When the strip reaches the rear stand at high speed, the deviation is large, often preventing timely intervention, resulting in severe tail swinging and damage to the rolls. Therefore, the detection and control of strip tail deviation is an urgent problem that needs to be solved.

[0003] Currently, the main technologies in this field are tension roller leveling technology developed by SMS Siemag and differential pressure looper technology, which uses strip tension detection and leveling on a looper. However, these technologies require significant investment and rely on indirect measurement and control, resulting in suboptimal control results. To address this, the rolling force must be passively varied during strip tailing, with the center deviation of the strip at the finishing stand exit also changing accordingly. By utilizing the actual rolling position within the strip stand and the rolling force variations measured during rolling, as measured by strip width measuring equipment installed at the post-finishing stand and at the finishing mill exit, a corresponding algorithm model has been developed to dynamically adjust the mill roll gap, ensuring that the strip is consistently rolled along the centerline of the finishing stand. This prevents strip tailing and improves rolling stability at the tail end of the strip. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a tail-dropping correction control system based on inter-frame deviation detection and a method of use, which solves the problems existing in the prior art.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a tail-dropping and correction control system based on inter-frame deviation detection, including a communication processing module, the communication processing module is electrically connected to a data processing module, the data processing module is electrically connected to an alarm module and a tail dynamic tracking module, the alarm module is electrically connected to a manual operation table, the tail dynamic tracking module is electrically connected to a tail dynamic control module, when in use, the frame is leveled according to the deviation of the rough rolling incoming material and the strip steel at the rolling mill entrance, the tail-dropping and correction control module performs time-space conversion on the time series data of the deviation of the center line of the R2 rough rolling outlet, and the tail dynamic tracking module is used to adjust the level of the frame according to the deviation of the rough rolling incoming material and the strip steel at the rolling mill entrance. The control judgment conditions determine the tail throwing control length, and the determined tail control position point enters the F1 frame to trigger the steel throwing dynamic control module. The steel throwing dynamic control module has different dynamic steel throwing correction control strategies for the upstream and downstream frames. For the upstream frame, the roll gap is adjusted according to the frame entrance deviation and the current frame influencing factors. The control strategy is: based on the deviation of each frame entrance and the influencing factors, and considering the tension change after the previous frame throws steel, adjust the roll gap difference of a single frame. For the downstream frame, based on the F3 exit deviation, the influencing factors of each downstream frame, and the distribution coefficient of each frame, adjust the roll gap. The control strategy is: based on the deviation of the F3 frame exit and the influencing factors of each frame, and considering the temperature drop of the strip tail and the tension change after the previous frame throws steel, according to the distribution coefficient of F4~F7 frames, jointly adjust the frame roll gap.

[0008] A method for using a tail-drop correction control system based on inter-rack deviation detection includes the above-mentioned tail-drop correction control system based on inter-rack deviation detection, and the specific operations are as follows:

[0009] Step 1: Tail dynamic tracking calculation:

[0010] The time series data of the centerline deviation at the R2 rough rolling outlet is converted into time and space, and the tail throwing control length is determined according to the tail control judgment conditions. The specific control is as follows:

[0011] The entire intermediate billet is divided into three parts according to its length: the head control stage, the body steady-state stage, and the tail control stage. The intermediate billet length range of 30%-60% is selected as the body steady-state stage, and the centerline deviation average value of the body steady-state stage is selected as the strip deviation value in the steady-state stage. The centerline data of the tail control stage is compared with the deviation data of the steady-state stage. When the value of a certain point in the tail control stage exceeds the set threshold and changes continuously and drastically, the length L at this time is set. tail As the trigger point for tail-throwing control.

[0012] When the F1 frame steel bite signal rises, the tail tracking calculation module is triggered. The data communicated from the L2 server include: F1 frame roll linear speed V0, F1 frame forward slip f.

[0013] Calculate the strip inlet velocity:

[0014]

[0015] Calculate the length of the strip passing through the F1 stand:

[0016]

[0017] When the following conditions are met, the tail dynamic control module is triggered and the F1 frame leveling value is output at the same time;

[0018] L=L tail

[0019] Step 2: Tail dynamic control data processing:

[0020] From the PLC communication Fi rack steel biting signal, when the steel biting signal falls, different steel throwing dynamic control modules are triggered according to the rack number

[0021] When i<4, the dynamic upstream control module of steel throwing is triggered. At the same time, the rack entrance deviation detection data D is obtained from the PLC communication Fi. in_i .

[0022] When i≥4, the dynamic downstream control module of steel throwing is triggered, and at the same time, the communication F3 rack outlet deviation detection data D out_3 .

[0023] When the deviation data is non-zero, judge the real-time deviation data of the Fi rack

[0024] If the deviation value is less than 40mm, the sum of the Fi rack head centerline offset is output; if the offset value is between 40mm and 60mm, the offset value is output as 40mm; otherwise, the alarm module is entered and the operator enters manual operation mode.

[0025] Calculate the number of deviation data points. When the number of data points is greater than 10, output the deviation detection data of the corresponding rack; otherwise, re-collect the deviation value data.

[0026] Step 3, the tail dynamic control module calculates:

[0027] When i=1 and the Fi steel biting signal rises, the upstream rack throwing control module is triggered, and the roughing sickle bend data DR2 is extracted from the roughing sickle bend database, and the real-time tension T1 of the F1 rack outlet looper, the real-time rolling force difference ΔP1 of the Fi rack, and the pressure difference P on both sides of the vertical roll are obtained from the PLC communication. F1E ; Communication from the empirical values ​​and weight coefficient data table of each rack: roughing sickle bending influence coefficient K DR2 , vertical roller pressure difference influence coefficient K F1E , F1 stand rolling force influence coefficient KΔP1 , F1 frame loop tension influence coefficient K T1

[0028] ΔS 3_1 =ΔS DR2 +ΔS F1E +ΔS P1 +ΔS TL1

[0029] =K DR2 *DR2+K F1E *P F1E +K Δp1 *ΔP1+K T1 *T1

[0030] When i=2, 3, and the Fi steel biting signal rises, the upstream rack steel throwing control module is triggered, and the deviation detection data D of the Fi rack entrance is received from the PLC communication. in_i And the real-time tension of the Fi rack outlet looper T i and Fi stand real-time rolling force difference ΔP i ;Communicate from the experience value and weight coefficient data table of each rack: Fi rack entrance deviation influence coefficient K in_i , Fi stand rolling force influence coefficient K ΔPi , Fi frame loop tension influence coefficient K Ti

[0031] Calculate the roller gap adjustment amount of F2 and F3 frames

[0032] ΔS 3_i =ΔS Din_i +ΔS Pi +ΔS TL_i

[0033] =K in_i *D in_i +K Δpi *ΔP i +K Ti *T i

[0034] When i≥4 and the Fi steel biting signal rises, the downstream rack steel throwing control module is triggered, and the deviation detection data D of the F3 rack outlet is transmitted from the PLC communication. out_3 And the real-time tension of the Fi rack outlet looper T i and Fi stand real-time rolling force difference ΔP i ; Communication from each rack's experience value and weight coefficient data table: each rack's allocation coefficient n 3_i , F3 frame outlet deviation influence coefficient K out_3 , Fi stand rolling force influence coefficient K ΔPi , Fi frame loop tension influence coefficient KTi

[0035] Calculate the downstream stand roll gap adjustment

[0036] ΔS 3_i =n 3_i *(ΔS Dout_3 +ΔS Pi +ΔS TLi )

[0037] =n 3_i *(K out_3 *D out_3 +K Δpi *ΔP i +K Ti *T i )

[0038] The pre-swing value of the roll gap of each frame is obtained according to different distribution coefficients, and it is judged whether the calculated value of the roll gap setting is within the normal range.

[0039] If the calculated roll gap setting value is within the normal range, the frame steel throwing dynamic control roll gap setting value instruction is issued and the tail dynamic control module ends.

[0040] Note: Among them:

[0041] DR2 is the rough rolling sickle camber data, ΔS DR2 is the roll gap adjustment caused by roughing sickle bending

[0042] P F1E is the vertical roller pressure difference, ΔS F1E The roller gap adjustment caused by the pressure difference of the vertical roller

[0043] ΔP1 is the rolling force difference of F1 stand, ΔS P1 is the roll gap adjustment caused by the rolling force difference

[0044] T1 is the tension of the F1 frame loop, ΔS TL1 The roller gap adjustment caused by the looper tension

[0045] K DR2 K is the roughing camber influence coefficient DR2 , K F1E K is the vertical roller pressure difference influence coefficient, ΔP1 is the rolling force influence coefficient of F1 stand, K T1 is the influence coefficient of the F1 frame loop tension;

[0046] D in_i is the deviation of each rack entrance, ΔS Din_i The roller gap adjustment amount caused by the deviation of the frame entrance

[0047] ΔPi is the rolling force difference of each stand, ΔS Pi is the roll gap adjustment caused by the rolling force difference of each stand

[0048] T i is the tension of each frame loop, ΔS TL_i The roller gap adjustment caused by the looper tension

[0049] K in_i is the influence coefficient of the rack entrance deviation of Fi, K ΔPi is the rolling force influence coefficient of Fi stand, K Ti K is the influence coefficient of the Fi frame loop tension Ti ;

[0050] n 3_i Assign coefficients to each rack

[0051] D out_3 is the deviation of the strip at the F3 exit, ΔS Dout_3 The roller gap adjustment caused by the deviation of F3 outlet

[0052] K out_3 K is the influence coefficient of the F3 frame outlet deviation out_3 , K ΔPi is the rolling force influence coefficient of Fi stand, K Ti Fi is the influence coefficient of the frame loop tension.

[0053] (3) Beneficial effects

[0054] The present invention provides a tail-dropping and correction control system based on inter-frame deviation detection and its use method. It has the following beneficial effects:

[0055] The tail-swinging correction control system and its use method based on inter-stand deviation detection is based on the principle of calculating the dynamic adjustment value of the roll gap of the next stand through the position information of the strip tail measured between the stands, realizing rapid correction of the strip tail offset and reducing the probability of tail-swinging. The actual rolling position in the strip stand and the rolling force change measured during the rolling process are measured by the strip width measuring equipment installed on the post-finishing stand and the finishing mill outlet, and the corresponding algorithm model is developed to dynamically adjust and control the mill roll gap, so that the strip is always rolled on the center line of the finishing stand, thereby solving the problem of tail-swinging during the rolling process of the strip tail and improving the rolling stability of the strip tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a flow chart of the tail-drop correction control system provided by an embodiment of the present invention.

[0057] Figure 2 This is the schematic diagram of the steel throwing dynamic control module;

[0058] Figure 3 Schematic diagram of the frame roll gap pre-swing value of the corresponding frame calculated by the distribution coefficient obtained through communication in the embodiment. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] See also Figure 1-3 The present invention provides a technical solution: a tail-dropping and correction control system based on inter-frame deviation detection, comprising a communication processing module, the communication processing module is electrically connected to a data processing module, the data processing module is electrically connected to an alarm module and a tail dynamic tracking module, the alarm module is electrically connected to a manual operation table, the tail dynamic tracking module is electrically connected to a tail dynamic control module, when in use, the frame is leveled according to the deviation of the rough rolling incoming material and the strip at the rolling mill entrance, the tail-dropping and correction control module performs time-space conversion on the time series data of the deviation of the center line of the R2 rough rolling outlet, and determines the deviation according to the tail control judgment conditions. The tail throwing control length is determined, and the steel throwing dynamic control module is triggered when the determined tail control position point enters the F1 frame. The steel throwing dynamic control module has different dynamic steel throwing correction control strategies for the upstream and downstream frames. For the upstream frame, the roll gap is adjusted according to the frame entrance deviation and the current frame influencing factors. The control strategy is: based on the deviation of each frame entrance and the influencing factors, and considering the tension change after the previous frame throws steel, adjust the roll gap difference of a single frame. For the downstream frame, according to the F3 exit deviation, the influencing factors of each downstream frame, and the distribution coefficient of each frame, adjust the roll gap. The control strategy is: based on the F3 exit deviation and the influencing factors of each frame, and considering the temperature drop of the strip tail and the tension change after the previous frame throws steel, according to the F4~F7 frame distribution coefficient, jointly adjust the frame roll gap.

[0061] A method for using a tail-drop correction control system based on inter-rack deviation detection, characterized in that it includes the tail-drop correction control system based on inter-rack deviation detection according to claim 1, and specifically operates as follows:

[0062] Step 1: Tail dynamic tracking calculation:

[0063] The time series data of the centerline deviation at the R2 rough rolling outlet is converted into time and space, and the tail throwing control length is determined according to the tail control judgment conditions. The specific control is as follows:

[0064] The entire intermediate billet is divided into three parts according to its length: the head control stage, the body steady-state stage, and the tail control stage. The intermediate billet length range of 30%-60% is selected as the body steady-state stage, and the centerline deviation average value of the body steady-state stage is selected as the strip deviation value in the steady-state stage. The centerline data of the tail control stage is compared with the deviation data of the steady-state stage. When the value of a certain point in the tail control stage exceeds the set threshold and changes continuously and drastically, the length L at this time is set. tail As the trigger point for tail-throwing control.

[0065] When the F1 frame steel bite signal rises, the tail tracking calculation module is triggered. The data communicated from the L2 server include: F1 frame roll linear speed V0, F1 frame forward slip f.

[0066] Calculate the strip inlet velocity:

[0067]

[0068] Calculate the length of the strip passing through the F1 stand:

[0069]

[0070] When the following conditions are met, the tail dynamic control module is triggered and the F1 frame leveling value is output at the same time;

[0071] L=L tail

[0072] Step 2: Tail dynamic control data processing:

[0073] From the PLC communication Fi rack steel biting signal, when the steel biting signal falls, different steel throwing dynamic control modules are triggered according to the rack number

[0074] When i<4, the dynamic upstream control module of steel throwing is triggered. At the same time, the rack entrance deviation detection data D is obtained from the PLC communication Fi. in_i .

[0075] When i≥4, the dynamic downstream control module of steel throwing is triggered, and at the same time, the communication F3 rack outlet deviation detection data D out_3 .

[0076] When the deviation data is non-zero, judge the real-time deviation data of the Fi rack

[0077] If the deviation value is less than 40mm, the sum of the Fi rack head centerline offset is output; if the offset value is between 40mm and 60mm, the offset value is output as 40mm; otherwise, the alarm module is entered and the operator enters manual operation mode.

[0078] Calculate the number of deviation data points. When the number of data points is greater than 10, output the deviation detection data of the corresponding rack; otherwise, re-collect the deviation value data.

[0079] Step 3, the tail dynamic control module calculates:

[0080] When i=1 and the Fi steel biting signal rises, the upstream rack throwing control module is triggered, and the roughing sickle bend data DR2 is extracted from the roughing sickle bend database, and the real-time tension T1 of the F1 rack outlet looper, the real-time rolling force difference ΔP1 of the Fi rack, and the pressure difference P on both sides of the vertical roll are obtained from the PLC communication. F1E ; Communication from the empirical values ​​and weight coefficient data table of each rack: roughing sickle bending influence coefficient K DR2 , vertical roller pressure difference influence coefficient K F1E , F1 stand rolling force influence coefficient K ΔP1 , F1 frame loop tension influence coefficient K T1

[0081] ΔS 3_1 =ΔS DR2 +ΔS F1E +ΔS P1 +ΔS TL1

[0082] =K DR2 *DR2+K F1E *P F1E +K Δp1 *ΔP1+K T1 *T1

[0083] When i=2, 3, and the Fi steel biting signal rises, the upstream rack steel throwing control module is triggered, and the deviation detection data D of the Fi rack entrance is received from the PLC communication. in_i And the real-time tension of the Fi rack outlet looper T i and Fi stand real-time rolling force difference ΔP i ;Communicate from the experience value and weight coefficient data table of each rack: Fi rack entrance deviation influence coefficient K in_i , Fi stand rolling force influence coefficient K ΔPi , Fi frame loop tension influence coefficient K Ti

[0084] Calculate the roller gap adjustment amount of F2 and F3 frames

[0085] ΔS 3_i =ΔS Din_i +ΔS Pi +ΔS TL_i

[0086] =K in_i *D in_i +KΔpi *ΔP i +K Ti *T i

[0087] When i≥4 and the Fi steel biting signal rises, the downstream rack steel throwing control module is triggered, and the deviation detection data D of the F3 rack outlet is transmitted from the PLC communication. out_3 And the real-time tension of the Fi rack outlet looper T i and Fi stand real-time rolling force difference ΔP i ; Communication from each rack's experience value and weight coefficient data table: each rack's allocation coefficient n 3_i , F3 frame outlet deviation influence coefficient K out_3 , Fi stand rolling force influence coefficient K ΔPi , Fi frame loop tension influence coefficient K Ti

[0088] Calculate the downstream stand roll gap adjustment

[0089] ΔS 3_i =n 3_i *(ΔS Dout_3 +ΔS Pi +ΔS TLi )

[0090] =n 3_i *(K out_3 *D out_3 +K Δpi *ΔP i +K Ti *T i )

[0091] The pre-swing value of the roll gap of each frame is obtained according to different distribution coefficients, and it is judged whether the calculated value of the roll gap setting is within the normal range.

[0092] If the calculated roll gap setting value is within the normal range, the frame steel throwing dynamic control roll gap setting value instruction is issued and the tail dynamic control module ends.

[0093] Note: Among them:

[0094] DR2 is the rough rolling sickle camber data, ΔS DR2 is the roll gap adjustment caused by roughing sickle bending

[0095] P F1E is the vertical roller pressure difference, ΔS F1E The roller gap adjustment caused by the pressure difference of the vertical roller

[0096] ΔP1 is the rolling force difference of F1 stand, ΔS P1 is the roll gap adjustment caused by the rolling force difference

[0097] T1 is the tension of the F1 frame loop, ΔS TL1 The roller gap adjustment caused by the looper tension

[0098] K DR2 K is the roughing camber influence coefficient DR2 , K F1E K is the vertical roller pressure difference influence coefficient, ΔP1 is the rolling force influence coefficient of F1 stand, K T1 is the influence coefficient of the F1 frame loop tension;

[0099] D in_i is the deviation of each rack entrance, ΔS Din_i The roller gap adjustment amount caused by the deviation of the frame entrance

[0100] ΔP i is the rolling force difference of each stand, ΔS Pi is the roll gap adjustment caused by the rolling force difference of each stand

[0101] T i is the tension of each frame loop, ΔS TL_i The roller gap adjustment caused by the looper tension

[0102] K in_i is the influence coefficient of the rack entrance deviation of Fi, K ΔPi is the rolling force influence coefficient of Fi stand, K Ti K is the influence coefficient of the Fi frame loop tension Ti ;

[0103] n 3_i Assign coefficients to each rack

[0104] D out_3 is the deviation of the strip at the F3 exit, ΔS Dout_3 The roller gap adjustment caused by the deviation of F3 outlet

[0105] K out_3 K is the influence coefficient of the F3 frame outlet deviation out_3 , K ΔPi is the rolling force influence coefficient of Fi stand, K Ti Fi is the influence coefficient of the frame loop tension.

[0106] Example:

[0107] The present invention provides a tail deviation correction control system based on inter-frame deviation detection, which includes a communication module, a data processing module, an alarm module, a tail dynamic tracking module and a tail dynamic control module.

[0108] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0109] Step 1: Tail dynamic tracking calculation:

[0110] When the F1 rack biting steel signal rises, the tail tracking calculation module is triggered.

[0111] Calculate the strip inlet velocity:

[0112]

[0113] Where: V0 is the linear speed of the F1 stand roller, f is the forward slide of the F1 stand, H is the set thickness at the R2 outlet, and h is the set thickness at the F1 outlet.

[0114] Use the F1 steel biting signal as the tracking signal of the entire strip length to calculate the length of the strip passing through the F1 stand:

[0115]

[0116] Where, t0 is the moment when F1 bites the steel, t1 is the current moment of F1 frame, V m is the strip inlet velocity, calculated by (13);

[0117] When L=Ltail, the tail-drop control module is triggered

[0118] Step 2: Dynamic tracking data processing of the tail, triggering the corresponding steel throwing dynamic control module according to the falling edge of the steel biting signal of different racks

[0119] When i<4, the dynamic upstream control module of steel throwing is triggered. At the same time, the rack entrance deviation detection data D is obtained from the PLC communication Fi. in_i .

[0120] When i≥4, the dynamic downstream control module of steel throwing is triggered, and at the same time, the communication F3 rack outlet deviation detection data D out_3 .

[0121] Judge the real-time deviation data of the Fi rack

[0122] Deviation value judgment: If the deviation value is less than 40mm, the sum of the Fi rack head centerline offset is output; if the offset value is between 40mm and 60mm, the offset value is output as 40mm; otherwise, the alarm module is entered and the operator enters manual operation mode.

[0123] Determination of the amount of deviation data: When the number of data points is greater than 10, the deviation detection data of the corresponding rack is output, otherwise the deviation value data is collected again.

[0124] Step 3, the tail dynamic control module calculates:

[0125] When i=1 and the Fi steel biting signal rises, the upstream rack throwing control module is triggered, and the roughing sickle bend data DR2 is extracted from the roughing sickle bend database, and the real-time tension T1 of the F1 rack outlet looper, the real-time rolling force difference ΔP1 of the Fi rack, and the pressure difference P on both sides of the vertical roll are obtained from the PLC communication. F1E ; Communication from the empirical values ​​and weight coefficient data table of each rack: roughing sickle bending influence coefficient K DR2 , vertical roller pressure difference influence coefficient K F1E , F1 stand rolling force influence coefficient K ΔP1 , F1 frame loop tension influence coefficient K T1

[0126] ΔS 3_1 =ΔS DR2 +ΔS F1E +ΔS P1 +ΔS TL1

[0127] =K DR2 *DR2+K F1E *P F1E +K Δp1 *ΔP1+K T1 *T1

[0128] When i=2, 3, and the Fi steel biting signal rises, the upstream rack steel throwing control module is triggered, and the deviation detection data D of the Fi rack entrance is received from the PLC communication. in_i And the real-time tension of the Fi rack outlet looper T i and Fi stand real-time rolling force difference ΔP i ;Communicate from the experience value and weight coefficient data table of each rack: Fi rack entrance deviation influence coefficient K in_i , Fi stand rolling force influence coefficient K ΔPi , Fi frame loop tension influence coefficient K Ti

[0129] Calculate the roller gap adjustment amount of F2 and F3 frames

[0130] ΔS 3_i =ΔS Din_i +ΔS Pi +ΔS TL_i

[0131] =K in_i *D in_i +K Δpi *ΔP i +K Ti *T i

[0132] When i≥4 and the Fi steel biting signal rises, the downstream rack steel throwing control module is triggered, and the deviation detection data D of the F3 rack outlet is transmitted from the PLC communication. out_3 And the real-time tension of the Fi rack outlet looper T i and Fi stand real-time rolling force difference ΔP i ; Communication from each rack's experience value and weight coefficient data table: each rack's allocation coefficient n 3_i , F3 frame outlet deviation influence coefficient K out_3 , Fi stand rolling force influence coefficient K ΔPi , Fi frame loop tension influence coefficient K Ti

[0133] Calculate the downstream stand roll gap adjustment

[0134] ΔS 3_i =n 3_i *(ΔS Dout_3 +ΔS Pi +ΔS TLi )

[0135] =n 3_i *(K out_3 *D out_3 +K Δpi *ΔP i +K Ti *T i )

[0136] According to different distribution coefficients, the pre-swing values ​​of the roll gaps of the F4, F5, F6 and F7 frames are obtained, and it is determined whether the calculated roll gap setting values ​​are within the normal range.

[0137] If the calculated roll gap setting value is within the normal range, the frame steel throwing dynamic control roll gap setting value instruction is issued and the tail dynamic control module ends.

[0138] At this point, the design of a tail-drop correction control system based on inter-frame deviation detection has been completed.

[0139] After applying this hot strip mill tail deviation correction control system to the finishing rolling measurement and control automatic deviation correction system of a 2250mm hot strip mill unit for large-scale industrial application, it achieved very significant results in controlling strip tail deviation. By referring to on-site production reports and calculating the number of tail strips per month, the tail deviation rate was reduced by more than 40%.

[0140] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0141] To summarize, the tail-swinging correction control system and its use method based on inter-stand deviation detection is based on the principle of calculating the dynamic adjustment value of the roll gap of the next stand through the position information of the strip tail measured between stands, realizing rapid correction of the strip tail offset and reducing the probability of tail-swinging. The actual rolling position in the strip stand and the rolling force change measured during the rolling process are measured by the strip width measuring equipment installed on the post-finishing stand and the finishing mill outlet, and the corresponding algorithm model is developed to dynamically adjust and control the mill roll gap, so that the strip is always rolled on the center line of the finishing stand, thereby solving the problem of tail-swinging during the rolling process of the strip tail and improving the rolling stability of the strip tail.

[0142] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0143] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for using a tail-drop correction control system based on inter-rack deviation detection, characterized by: It includes a tail-dropping correction control system based on inter-frame deviation detection. The tail-dropping correction control system based on inter-frame deviation detection includes a communication processing module. The communication processing module is electrically connected to a data processing module. The data processing module is electrically connected to an alarm module and a tail dynamic tracking module. The alarm module is electrically connected to a manual operation table. The tail dynamic tracking module is electrically connected to a tail dynamic control module. When in use, the frame is leveled according to the rough rolling incoming material and the deviation of the strip steel at the rolling mill entrance. The tail-dropping dynamic tracking module performs time-space conversion on the time series data of the deviation of the center line of the R2 rough rolling outlet, determines the tail-dropping control length according to the tail control judgment condition, and triggers the steel-dropping dynamic control when the determined tail control position point enters the F1 frame. Module, the steel throwing dynamic control module has different control strategies for the dynamic steel throwing correction of the upstream and downstream frames. For the upstream frame, the roll gap is adjusted according to the frame entrance deviation and the influencing factors of the current frame. The control strategy is: based on the inlet deviation of each frame and the influencing factors, and considering the tension change after the previous frame throws steel, the roll gap difference of a single frame is adjusted. For the downstream frame, based on the F3 exit deviation, the influencing factors of each downstream frame, and the distribution coefficient of each frame, the roll gap is adjusted. The control strategy is: based on the F3 exit deviation and the influencing factors of each frame, and considering the temperature drop of the strip tail and the tension change after the previous frame throws steel, the frame roll gap is adjusted according to the distribution coefficient of F4~F7 frames. The specific operation of the tail-drop correction control system based on inter-frame deviation detection is as follows: Step 1: Tail dynamic tracking calculation: The time series data of the centerline deviation at the R2 rough rolling outlet are transformed into time and space, and the tail throwing control length is determined according to the tail control judgment conditions. The specific control is as follows: The entire intermediate billet is divided into three parts according to its length: the head control stage, the body steady-state stage, and the tail control stage. The intermediate billet length range of 30%-60% is selected as the body steady-state stage. The centerline deviation mean value of the body steady-state stage is selected as the strip deviation value in the steady-state stage. The centerline data of the tail control stage is compared with the deviation data of the steady-state stage. When the value of a certain point in the tail control stage exceeds the set threshold and changes continuously and drastically, the length L at this time is set to 0. tail As a trigger point for tail casting control; When the F1 frame steel biting signal rises, the tail tracking calculation module is triggered and the data from the L2 server communication: F1 frame roller linear speed , F1 rack slides forward; Calculate the strip inlet velocity: ; Calculate the length of the strip passing through the F1 stand: ; When the following conditions are met, the tail dynamic control module is triggered and the F1 frame leveling value is output at the same time; ； in: is the strip inlet velocity; is the linear speed of the F1 stand roll; It is the F1 rack slide back; It is the F1 rack forward slide; is the F1 frame entrance thickness; is the thickness of the F1 frame outlet; It is the length of the strip passing through the F1 stand; Steel biting signal rising edge time; Falling edge time of steel biting signal; Steel bite signal time; Time variation; dt is the unit time in calculus; Step 2: Tail dynamic control data processing: From the PLC communication Fi rack steel biting signal, when the steel biting signal falls, different steel throwing dynamic control modules are triggered according to the rack number; When i<4, the steel throwing dynamic upstream control module is triggered, and at the same time, the rack entrance deviation detection data is received from the PLC communication Fi D in_i When i≥4, the dynamic downstream control module of steel throwing is triggered, and at the same time, the F3 rack outlet deviation detection data is communicated. D out_3 When the deviation data is non-zero, judge the real-time deviation data of the Fi rack If the deviation value is less than 40mm, the sum of the centerline offset of the Fi rack head is output; if the offset value is between 40mm and 60mm, the offset value is output as 40mm; otherwise, the alarm module is entered and the operator enters the manual operation mode; Calculate the number of deviation data points. If the number of data points is greater than 10, output the deviation detection data of the corresponding rack. Otherwise, re-collect the deviation value data. Step 3, the tail dynamic control module calculates: When i=1 and the Fi steel biting signal rises, the upstream rack steel throwing control module is triggered, and the roughing sickle bend data DR2 is extracted from the roughing sickle bend database, and the real-time tension of the F1 rack outlet looper is obtained from the PLC communication. ,Fi stand real-time rolling force difference , Pressure difference on both sides of vertical roller ;Communicate from the experience value and weight coefficient data table of each rack: rough rolling sickle bending influence coefficient , vertical roller pressure difference influence coefficient , F1 stand rolling force influence coefficient , F1 frame loop tension influence coefficient ; When i=2, 3, and the Fi steel biting signal rises, the upstream rack steel throwing control module is triggered, and the deviation detection data of the Fi rack entrance is received from the PLC communication. D in_i And the real-time tension of the Fi rack outlet loop Real-time rolling force difference with Fi stand ;Communicate from the experience value and weight coefficient data table of each rack:Fi rack entrance deviation influence coefficient ,Fi stand rolling force influence coefficient , Fi is the influence coefficient of the frame loop tension; Calculate the roller gap adjustment amount of F2 and F3 frames: ； When i≥4 and the Fi steel biting signal rises, the downstream rack steel throwing control module is triggered and the deviation detection data of the F3 rack outlet is obtained from the PLC communication. D out_3 And the real-time tension of the Fi rack outlet loop Real-time rolling force difference with Fi stand ; Communication from each rack's experience value and weight coefficient data table: each rack's allocation coefficient , F3 frame outlet deviation influence coefficient ,Fi stand rolling force influence coefficient ,Fi frame loop tension influence coefficient ; Calculate the downstream stand roll gap adjustment: ； Obtain the pre-swing value of the roll gap of each stand according to different distribution coefficients, and judge whether the calculated roll gap setting value is within the normal range; If the calculated roll gap setting value is within the normal range, the roll gap setting value instruction of the frame steel throwing dynamic control is issued, and the tail dynamic control module ends; Note: Among them: DR2 is the rough rolling sickle camber data, is the roll gap adjustment caused by roughing sickle bending; P F1E is the vertical roller pressure difference, The roller gap adjustment caused by the pressure difference of the vertical rollers; ∆P1 is the rolling force difference of F1 stand, is the roll gap adjustment amount caused by the rolling force difference; T1 is the tension of the F1 frame loop, is the roller gap adjustment caused by the looper tension; is the rough rolling sickle camber influence coefficient , is the vertical roller pressure difference influence coefficient, is the rolling force influence coefficient of F1 stand, is the influence coefficient of the F1 frame loop tension; D in_i is the deviation amount of each rack entrance, The roller gap adjustment amount caused by the deviation of the frame entrance; ∆P i is the rolling force difference of each stand, is the roll gap adjustment amount caused by the rolling force difference of each stand; T i is the tension of each frame loop, is the roller gap adjustment caused by the looper tension; is the influence coefficient of rack entrance deviation at Fi, is the rolling force influence coefficient of the Fi stand, Fi is the influence coefficient of the frame loop tension ; n 3_i Assign coefficients to each rack; D out_3 is the deviation of the strip at the F3 exit, The roller gap adjustment amount caused by the deviation of F3 exit; The influence coefficient of F3 frame outlet deviation , is the rolling force influence coefficient of the Fi stand, Fi is the influence coefficient of the frame loop tension.

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