Method and device for setting furnace zone speed of continuous annealing production line

Abstract

The present application relates to the field of steel rolling technology, and discloses a method and device for setting the furnace speed of a continuous annealing production line. The method includes: constructing a first outlet section automatic step model and a second outlet section automatic step model based on the outlet withdrawal speed limited by the strip length balance at the skin-pass mill and the outlet withdrawal speed limited by the strip length balance from the skin-pass mill to the trimming shear; constructing an outlet looper relative displacement model based on the outlet automatic step duration, the outlet automatic step speed, and the furnace speed; constructing an outlet evacuation looper minimum strip length model based on the furnace speed and the looper increase during the outlet filling period; constructing an outlet looper remaining looper model based on the looper increase during the outlet filling period; determining a furnace speed limiting model based on the above multiple models, and determining the furnace speed of the continuous annealing production line based on the furnace speed limiting model. The technical solution proposed in the present application can obtain the furnace speed limit of the strip under complex and changeable production conditions.

Description

Technical Field

[0001] The present application relates to the technical field of steel rolling, and discloses a method and device for setting the speed of a furnace zone of a continuous annealing production line. Background Art

[0002] For cold rolling, continuous annealing, and galvanizing lines, an outlet looper is installed between the annealing furnace and the exit to ensure stable furnace speed. During normal production, the outlet looper is at an empty capacity. If the outlet looper capacity becomes too high, the furnace speed must be reduced to ensure continuous and stable operation.

[0003] The interference factors that affect the increase in furnace speed at the exit section include: exit automatic step cycle, exit sleeve withdrawal speed, exit follow-up furnace time, exit looper safety factor, exit looper length, incoming material length, number of coils, and whether trimming or sleeve replacement is performed. These interference factors all limit the furnace speed to a certain extent. However, there is currently no mature model that can be used to calculate the furnace speed limit of strip steel of different specifications, steel grades, and coil weights under complex and changing production conditions. Once an abnormal accident occurs in the exit section when the furnace is running at high speed, such as curling and wrinkling, tie heads, etc., it is very easy for the exit looper quantity to be in a "sub-healthy" state due to the mismatch between the exit and furnace speeds. In severe cases, the unit may be shut down unplanned due to the full exit looper quantity. Based on this, the present application proposes a method for setting the furnace zone speed of a continuous annealing production line, which can quantitatively calculate the furnace zone limit speed of strip steel of different specifications, steel grades, and coil weights under complex and changeable production conditions at the export, and can also obtain key process parameters such as the minimum strip length required for the export looper to maintain the empty loop amount, the export fault processing time, etc., and guide the speed setting of the export section and the furnace section in abnormal conditions based on the key process parameters, so as to avoid unplanned shutdown accidents caused by excessive looper volume at the export. Summary of the Invention

[0004] This application relates to the field of steel rolling technology and discloses a method and device for setting the furnace speed of a continuous annealing production line. This method can quantitatively calculate the furnace speed limit of strip steel of different specifications, steel grades, and coil weights under complex and variable production conditions at the export site.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a method for setting the furnace zone speed of a continuous annealing production line is provided, the method comprising: constructing a first outlet section automatic step model and a second outlet section automatic step model based on the outlet withdrawal speed limited by the strip length balance at the leveler and the outlet withdrawal speed limited by the strip length balance from the leveler to the trimming shear; constructing an outlet looper relative displacement model based on the outlet automatic step duration, the outlet automatic step speed and the furnace zone speed; constructing an outlet evacuation looper minimum strip length model based on the furnace zone speed and the looper increase during outlet filling; constructing an outlet looper remaining looping quantity model based on the looper increase during outlet filling; determining a furnace zone speed limiting model based on the first outlet section automatic step model, the second outlet section automatic step model, the outlet looper relative displacement model, the outlet evacuation looper shortest strip length model and the outlet looper remaining looping quantity model, and determining the furnace zone speed of the continuous annealing production line based on the furnace zone speed limiting model.

[0007] In one embodiment of the present application, based on the above solution, the first exit section automatic step model includes:

[0008]

[0009]

[0010] v EX2 =min(v op-SPM ,v op-WN ,v EXmax ),

[0011]

[0012]

[0013] Among them, v EX1 is the SPM&DCR speed across the weld, in m / min; t EX1 For SPM&DCR through weld with v EX1 Hold time, in seconds; v F(i,1) is the furnace speed, in m / min; a EX is the acceleration of the exit section, in m / s 2 ;v op-SPM v is the exit withdrawal speed from the skin pass mill to the trimming shear strip steel balance limit, in m / min; EX2 The speed after the leveling machine is controlled in m / min; t EX2 After the leveling machine, v EX2 Hold time, in seconds; v EX3 The speed of the trimming shear is m / min; t EX3 Before cutting, use vEX1 Hold time, in seconds; v op-WN The maximum withdrawal speed at the outlet during the automatic step of the side trimming shear is in m / min; L SPM-WN v is the distance from the leveling machine to the trimming shear, in m; EXmax v is the maximum extraction speed at the outlet, in m / min; SPM-WN The maximum withdrawal speed of the outlet during the automatic step from the leveling machine to the trimming shear, in m / min; v EX4 is the shearing speed in m / min; t EX4 To cut the edge with v EX4 Hold time, in seconds; v EX5 The maximum withdrawal speed at the outlet before the flying shear enters the automatic step, in m / min; L WN-FS v is the distance from the trimming shear to the flying shear, in m; EX6 It is the flying shear preparation speed, in m / min.

[0014] In one embodiment of the present application, based on the above solution, the second exit section automatic step model includes:

[0015]

[0016] v EX5 =min(v op-SPM ,v op-FS ,v EXmax ),

[0017]

[0018] Among them, v op-FS The exit withdrawal speed from the skin-pass mill to the flying shear strip is limited by the balance, in m / min; t EX5 Before entering the flying shear, EX5 Hold time, in seconds; t EX6 Before entering the flying shear, EX6 Hold time, in seconds; L SPM-FS The distance from the leveling machine to the flying shear, in m.

[0019] In one embodiment of the present application, based on the above solution, the outlet looper relative displacement model includes:

[0020]

[0021]

[0022] ΔL EX(i,1) =L EX-in(i,1) -L EX-out(i,1)

[0023] Among them, L EX-out(i,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; t EXk v is the duration of the kth automatic step at the exit, in seconds; EXk The exit speed corresponding to the kth automatic step of the exit is in m / min; L mEX-out(i,1) The displacement of the mth sub-roll at the outlet of the outlet loop during the outlet filling period, in m; EX1 The sum of the absolute values ​​of the square differences between adjacent automatic steps of strategy 1, in units of m 2 / min 2 ;Λ EX2 The sum of the absolute values ​​of the squared differences between adjacent automatic steps of strategy 2, in units of m 2 / min 2 ; m is the export sub-volume number; L EX-in(i,1) AtuoM is the displacement of the strip at the entrance of the outlet loop during the outlet filling period, in m; k The automatic step status of the outlet sleeve change, crescent cutting, and trimming shear knife adjustment, 1 means activated, 0 means closed; Λ EX3 The sum of the absolute values ​​of the speed differences between adjacent automatic steps, in m / min; EX4 The sum of the absolute values ​​of the speed differences between adjacent automatic steps, m / min; L mEX-out(i,1) The displacement of the mth sub-roll at the entrance of the outlet loop during the outlet filling period, in m; ΔL EX(i,1) It is the relative displacement of the strip in the outlet loop when the outlet loop is filled, that is, the increase in the length of the outlet loop, the unit is m.

[0024] In one embodiment of the present application, based on the above solution, the outlet evacuation loop shortest strip length model includes:

[0025]

[0026] Among them, v EX(i,1) is the outlet sleeve speed, in m / min; t EXf The length of time the outlet follows the furnace speed, in seconds; L EX-stp(i,1) ΔL is the shortest strip length required by the outlet evacuation sleeve at different furnace speeds, in meters; EX(i,1) The relative displacement of the strip in the outlet loop when filling the loop, that is, the increase in the length of the outlet loop, in meters; L EX-out(I,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; N c The number of export volumes.

[0027] In one embodiment of the present application, based on the above solution, the export loop remaining quantity model includes:

[0028] EXL EX-LP(i,1) =(ab·ΔL EX(i,1) ) / 100

[0029] Among them, EXL EX-LP(i,1) The amount of sleeves available for filling before the outlet starts filling, in %; ΔL EX(i,1) It is the increase of loop amount during the export filling period, the unit is m; a is the maximum loop amount, the value range is 90~99, b is the rate of change of loop amount with strip length, the value range is 0.02~0.2, the unit is % / m.

[0030] In one embodiment of the present application, based on the above solution, the furnace zone speed limiting model includes:

[0031] v EXmax(i,j) =F1(L EX-STP(i,j) ),

[0032]

[0033] v EXLPmax =F2(L EXLPmax ),

[0034] v F-EXmax(i,j) =min(v EXmax(i,j) ,v EXLPmax )

[0035] Among them, v F-EXmax(i,j) v is the limit value of the annealing furnace's maximum speed at the outlet, in m / min; EXmax(i,j) v is the speed limit of the furnace area for the export production rhythm, the unit is m / min; EXLPmax The maximum speed of the furnace zone corresponding to the maximum set of the exit looper limited by production, in m / min; v EXmax(i,j) It is the limitation of the furnace speed under the outlet production rhythm under different incoming material lengths, in m / min; L stp-max(i,j) L is the length of the incoming material, in m; EXLPmax The maximum number of export loops limited by production, in %; v EXLPmax The maximum speed of the furnace zone corresponding to the maximum amount of exit loops limited by production, in m / min.

[0036] In one embodiment of the present application, based on the aforementioned scheme, the method further includes: constructing a maximum processing time model for export faults based on the first export section automatic step model, the second export section automatic step model, the export looper relative displacement model, the export evacuation looper shortest strip length model and the export looper remaining loop model.

[0037] In one embodiment of the present application, based on the above solution, the longest processing time model for an egress fault includes:

[0038] L EXLP(i,1) =k EXLP ·L MAX-EXLP EXL EX-LP(i,1) ,

[0039]

[0040]

[0041] Among them, L EXLP(i,1) The length of strip steel that can be filled in the exit loop at different furnace speeds, in meters; EXt EX1(i,1) The maximum processing time of the furnace zone non-speed reduction outlet fault, in seconds; EXL EX-LP(i,1) The amount of the outlet loop that can be used to fill the loop before the outlet starts to withdraw the loop, in %; k EXLP L is the safety factor of the outlet loop, dimensionless; MAX-EXLP The maximum design volume of the export looper, in m; v Fsd is the target value of the furnace speed when the furnace speed drops sharply, in m / min; a F is the furnace zone acceleration, in m / s 2 ;EXt EX2(i,1) The maximum processing time for the furnace zone speed reduction outlet fault, in seconds.

[0042] According to a second aspect of an embodiment of the present application, a device for setting the furnace zone speed of a continuous annealing production line is provided, the device comprising: a first construction unit, used to construct a first outlet section automatic step model and a second outlet section automatic step model based on the outlet withdrawal speed limited by the strip length balance at the level pass mill and the outlet withdrawal speed limited by the strip length balance from the level pass mill to the trimming shear; a second construction unit, used to construct an outlet looper relative displacement model based on the outlet automatic step duration, the outlet automatic step speed and the furnace zone speed; a third construction unit, used to construct an outlet evacuation looper shortest strip length model based on the furnace zone speed and the looper increase during outlet filling; a fourth construction unit, used to construct an outlet looper remaining looping quantity model based on the looper increase during outlet filling; a determination unit, used to determine a furnace zone speed limitation model based on the first outlet section automatic step model, the second outlet section automatic step model, the outlet looper relative displacement model, the outlet evacuation looper shortest strip length model and the outlet looper remaining looping quantity model, and determine the furnace zone speed of the continuous annealing production line based on the outlet to furnace zone speed limitation model.

[0043] In the technical solution proposed in the present application, based on the outlet withdrawal speed limited by the strip length balance at the level-pass mill and the outlet withdrawal speed limited by the strip length balance from the level-pass mill to the trimming shear, a first outlet section automatic step model and a second outlet section automatic step model are constructed; based on the outlet automatic step duration, the outlet automatic step speed and the furnace zone speed, an outlet looper relative displacement model is constructed; based on the furnace zone speed and the looper increase during outlet filling, an outlet evacuation looper minimum strip length model is constructed; based on the looper increase during outlet filling, an outlet looper remaining quantity model is constructed; based on the first outlet section automatic step model, the second outlet section automatic step model, the outlet looper relative displacement model, the outlet evacuation looper shortest strip length model and the outlet looper remaining quantity model, a furnace zone speed limitation model is determined, and based on the furnace zone speed limitation model, the furnace zone speed of the continuous annealing production line is determined. Therefore, the technical solution proposed in this application can quantitatively calculate the furnace zone limit speed of strip steel of different specifications, steel grades, and coil weights under complex and changeable production conditions at the export, and can also obtain key process parameters such as the minimum strip length required for the export looper to maintain the empty loop amount, the export fault processing time, etc., and based on the key process parameters, guide the speed setting of the export section and the furnace section during abnormal conditions, so as to avoid unplanned shutdown accidents caused by excessive looper volume at the export.

[0044] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, explaining the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0046] Figure 1 A flow chart showing a method for setting the furnace zone speed of a continuous annealing production line in an embodiment of the present application is shown;

[0047] Figure 2 The figure shows the automatic step sequence diagram of the exit section corresponding to Strategy 1 in the embodiment of the present application;

[0048] Figure 3 The figure shows the automatic step sequence diagram of the exit section corresponding to Strategy 2 in the embodiment of the present application;

[0049] Figure 4 It shows a time series diagram of the automatic step speed and duration of the continuous exit area in a specific embodiment of the present application;

[0050] Figure 5A line graph showing the effect of furnace zone speed reduction on the furnace zone limit speed before and after automatic step optimization of the exit section and after a fault in a specific embodiment of the present application when the steel coil is not divided;

[0051] Figure 6 A line graph showing the effect of furnace zone speed reduction on the furnace zone limit speed before and after automatic step optimization of the exit section and after a fault when a steel coil is divided into two in a specific embodiment of the present application is shown;

[0052] Figure 7 A line graph showing the effect of furnace zone speed reduction on the furnace zone limit speed before and after automatic step optimization of the exit section and after a fault when a steel coil is divided into three parts in a specific embodiment of the present application is shown;

[0053] Figure 8 An analysis diagram showing the impact of process parameters in the exit area on the furnace zone limit speed before and after optimization when the steel coil is not divided into coils in a specific embodiment of the present application is shown;

[0054] Figure 9 An analysis diagram showing the impact of process parameters in the exit area on the furnace zone limit speed before and after optimization when a steel coil is divided into two in a specific embodiment of the present application is shown;

[0055] Figure 10 It shows an analysis diagram of the impact of the process parameters of the exit area on the furnace zone limit speed before and after optimization when the steel coil is divided into three parts in a specific embodiment of the present application;

[0056] Figure 11 A block diagram of a device for setting the furnace zone speed of a continuous annealing production line in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0057] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0058] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0059] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0060] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0061] It should be noted that the term "plurality" used in this document refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0062] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described.

[0063] The following is a detailed description of the implementation details of the technical solution of the embodiment of the present application:

[0064] Figure 1 A flow chart of a method for setting the furnace zone speed of a continuous annealing production line in an embodiment of the present application is shown.

[0065] like Figure 1 As shown, the method for setting the furnace zone speed of the continuous annealing production line includes at least steps 110 to 190.

[0066] The following will Figure 1 Steps 110 to 190 are described in detail:

[0067] In step 110, based on the exit withdrawal speed limited by the strip length balance at the skin-pass mill and the exit withdrawal speed limited by the strip length balance from the skin-pass mill to the trimming shear, a first exit section automatic step model and a second exit section automatic step model are constructed.

[0068] Continue to refer Figure 1 In step 130, based on the outlet automatic step duration, outlet automatic step speed and furnace zone speed, the outlet loop relative displacement model is constructed.

[0069] Continue to refer Figure 1 In step 150, based on the furnace zone speed and the amount of looper increase during the outlet filling period, a model of the shortest strip length of the outlet evacuation looper is constructed.

[0070] Continue to refer Figure 1 In step 170, based on the increase in the loop amount during the outlet filling period, a model for the remaining amount of the outlet loop is constructed.

[0071] Continue to refer Figure 1 In step 190, based on the first exit section automatic step model, the second exit section automatic step model, the exit looper relative displacement model, the exit evacuation looper shortest strip length model and the exit looper remaining loop model, a furnace zone speed limiting model is determined, and the furnace zone speed of the continuous annealing production line is determined based on the furnace zone speed limiting model.

[0072] Figure 2 The figure shows the automatic step sequence diagram of the exit section corresponding to Strategy 1 in the embodiment of the present application.

[0073] Figure 3 The figure shows the automatic step sequence diagram of the exit section corresponding to Strategy 2 in the embodiment of the present application.

[0074] like Figure 2 and Figure 3 As shown in the figure, there are two common automatic step strategies for the exit section. Strategy 1 is that the strip passes through the side trimmer first and then enters the flying shear after passing the skin pass mill. Strategy 2 is that the strip directly enters the flying shear after passing the skin pass mill. According to the different automatic step strategies for the exit section, based on the exit withdrawal speed limited by the strip length balance at the skin pass mill and the exit withdrawal speed limited by the strip length balance from the skin pass mill to the side trimmer, the first exit section automatic step model and the second exit section automatic step model are obtained respectively.

[0075] In one embodiment of the present application, the first exit section automatic step model includes:

[0076]

[0077]

[0078] v EX2 =min(v op-SPM ,v op-WN ,v EXmax ),

[0079]

[0080]

[0081] Among them, vEX1 is the SPM&DCR speed across the weld, in m / min; t EX1 For SPM&DCR through weld with v EX1 Hold time, in seconds; v F(i,1) is the furnace speed, in m / min; a EX is the acceleration of the exit section, in m / s 2 ;v op-SPM v is the exit withdrawal speed from the skin pass mill to the trimming shear strip steel balance limit, in m / min; EX2 The speed after the leveling machine is controlled in m / min; t EX2 After the leveling machine, v EX2 Hold time, in seconds; v EX3 The speed of the trimming shear is m / min; t EX3 Before cutting, use v EX1 Hold time, in seconds; v op-WN The maximum withdrawal speed at the outlet during the automatic step of the side trimming shear is in m / min; L SPM-WN v is the distance from the leveling machine to the trimming shear, in m; EXmax v is the maximum extraction speed at the outlet, in m / min; SPM-WN The maximum withdrawal speed of the outlet during the automatic step from the leveling machine to the trimming shear, in m / min; v EX4 is the shearing speed in m / min; t EX4 To cut the edge with v EX4 Hold time, in seconds; v EX5 The maximum withdrawal speed at the outlet before the flying shear enters the automatic step, in m / min; L WN-FS v is the distance from the trimming shear to the flying shear, in m; EX6 It is the flying shear preparation speed, in m / min.

[0082] In this application, when v op-WN ≥v op-SPM , the leveling machine needs to be v SPM-WN Run for a certain time t EX2 On the contrary, it is not necessary to run at a low speed of vSPM-WN for a certain period of time, i.e., t EX2 =0,t EX5 =0.

[0083] In one embodiment of the present application, the second exit section automatic step model includes:

[0084]

[0085] v EX5 =min(v op-SPM ,vop-FS ,v EXmax ),

[0086]

[0087] Among them, v op-FS The exit withdrawal speed from the skin-pass mill to the flying shear strip is limited by the balance, in m / min; t EX5 Before entering the flying shear, EX5 Hold time, in seconds; t EX6 Before entering the flying shear, EX6 Hold time, in seconds; L SPM-FS The distance from the leveling machine to the flying shear, in m.

[0088] In one embodiment of the present application, the outlet looper relative displacement model includes:

[0089]

[0090]

[0091] ΔL EX(i,1) =L EX-in(i,1) -L EX-out(i,1)

[0092] Among them, L EX-out(i,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; t EXk v is the duration of the kth automatic step at the exit, in seconds; EXk The exit speed corresponding to the kth automatic step of the exit is in m / min; L mEX-out(i,1) The displacement of the mth sub-roll at the outlet of the outlet loop during the outlet filling period, in m; EX1 The sum of the absolute values ​​of the square differences between adjacent automatic steps of strategy 1, in units of m 2 / min 2 ;Λ EX2 The sum of the absolute values ​​of the squared differences between adjacent automatic steps of strategy 2, in units of m 2 / min 2 ; m is the export sub-volume number; L EX-in(i,1) AtuoM is the displacement of the strip at the entrance of the outlet loop during the outlet filling period, in m; k The automatic step status of the outlet sleeve change, crescent cutting, and trimming shear knife adjustment, 1 means activated, 0 means closed; Λ EX3 The sum of the absolute values ​​of the speed differences between adjacent automatic steps, in m / min; EX4 The sum of the absolute values ​​of the speed differences between adjacent automatic steps, m / min; L mEX-out(i,1)The displacement of the mth sub-roll at the entrance of the outlet loop during the outlet filling period, in m; ΔL EX(i,1) It is the relative displacement of the strip in the outlet loop when the outlet loop is filled, that is, the increase in the length of the outlet loop, the unit is m.

[0093] In this application, according to the export automatic step speed v EXk , furnace zone speed v F(i,1) , get the sum of the absolute values ​​of the square differences between adjacent automatic steps Λ EX1 , according to the different common automatic step strategies of the exit section, the calculation formulas are:

[0094]

[0095]

[0096] In this application, according to the automatic step speed v after the outlet roll EXk , furnace zone speed v F(i,1) , get the sum of the absolute values ​​of the square differences between adjacent automatic steps Λ EX2 , the calculation formula is as follows:

[0097]

[0098] Among them, v EXk The exit speed corresponding to the kth automatic step at the exit, m / min.

[0099] In this application, according to the export automatic step speed v EXk , furnace zone speed v F(i,1) , Maximum sleeve withdrawal speed v at the exit during the automatic step from the flat mill to the trimming shear SPM-WN And the maximum extraction speed v of the outlet during the period from edge cutting to flying shearing WN-FS (Maximum sleeve withdrawal speed v during automatic step from leveling machine to flying shear SPM-FS ), and the absolute value of the speed difference between adjacent automatic steps is obtained EX3 , according to the different common automatic step strategies of the exit section, the calculation formulas are:

[0100]

[0101]

[0102] In this application, according to the automatic step speed v of the outlet after the roll is divided EXk , furnace zone speed v F(i,1) , get the sum of the absolute values ​​of the speed differences between adjacent automatic steps Λ EX4 , the calculation formula is as follows:

[0103]

[0104] In one embodiment of the present application, the outlet evacuation loop shortest strip length model includes:

[0105]

[0106] Among them, v EX(i,1) is the outlet sleeve speed, in m / min; t EXf The length of time the outlet follows the furnace speed, in seconds; L EX-stp(i,1) ΔL is the shortest strip length required by the outlet evacuation sleeve at different furnace speeds, in meters; EX(i,1) The relative displacement of the strip in the outlet loop when filling the loop, that is, the increase in the length of the outlet loop, in meters; L EX-out(I,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; N c The number of export volumes.

[0107] In this application, N c =0 means the steel coil is not divided into rolls, N c =1 means the steel coil is divided into 2, N c =2 means 1 steel coil is divided into 3, N c =3 means 1 steel coil is divided into 4.

[0108] In one embodiment of the present application, the export loop remaining quantity model includes:

[0109] EXL EX-LP(i,1) =(ab·ΔL EX(i,1) ) / 100

[0110] Among them, EXL EX-LP(i,1) The amount of sleeves available for filling before the outlet starts filling, in %; ΔL EX(i,1) It is the increase of loop amount during the export filling period, the unit is m; a is the maximum loop amount, the value range is 90~99, b is the rate of change of loop amount with strip length, the value range is 0.02~0.2, the unit is % / m.

[0111] In one embodiment of the present application, the furnace zone speed limiting model includes:

[0112] v EXmax(i,j) =F1(L EX-STP(i,j) ),

[0113]

[0114] v EXLPmax =F2(L EXLPmax ),

[0115] v F-EXmax(i,j) =min(v EXmax(i,j) ,vEXLPmax )

[0116] Among them, v F-EXmax(i,j) v is the limit value of the annealing furnace's maximum speed at the outlet, in m / min; EXmax(i,j) v is the speed limit of the furnace area for the export production rhythm, the unit is m / min; EXLPmax The maximum speed of the furnace zone corresponding to the maximum set of the exit looper limited by production, in m / min; v EXmax(i,j) It is the limitation of the furnace speed under the outlet production rhythm under different incoming material lengths, in m / min; L stp-max(i,j) L is the length of the incoming material, in m; EXLPmax The maximum number of export loops limited by production, in %; v EXLPmax The maximum speed of the furnace zone corresponding to the maximum amount of exit loops limited by production, in m / min.

[0117] In one embodiment of the present application, the method further includes: constructing a maximum processing time model for export faults based on the first export section automatic step model, the second export section automatic step model, the export looper relative displacement model, the export evacuation looper shortest strip length model and the export looper remaining loop model.

[0118] In one embodiment of the present application, the maximum processing time model for an egress fault includes:

[0119] L EXLP(i,1) =k EXLP ·L MAX-EXLP EXL EX-LP(i,1) ,

[0120]

[0121]

[0122] Among them, L EXLP(i,1) The length of strip steel that can be filled in the exit loop at different furnace speeds, in meters; EXt EX1(i,1) The maximum processing time of the furnace zone non-speed reduction outlet fault, in seconds; EXL EX-LP(i,1) The amount of the outlet loop that can be used to fill the loop before the outlet starts to withdraw the loop, in %; k EXLP L is the safety factor of the outlet loop, dimensionless; MAX-EXLP The maximum design volume of the export looper, in m; v Fsd is the target value of the furnace speed when the furnace speed drops sharply, in m / min; a F is the furnace zone acceleration, in m / s2; EXt EX2(i,1) The maximum processing time for the furnace zone speed reduction outlet fault, in seconds.

[0123] In this application, the longest processing time of the outlet fault is divided into two cases: the furnace speed is reduced and the furnace speed is not reduced. According to the different speeds of the furnace zone, the length of the strip steel that can be filled in the outlet looper is L. EXLP(i,1) And the furnace zone speed v F(i,1) , get the longest processing time EXt of the furnace area non-speed reduction outlet fault EX1(i,1) , the calculation formula is as follows:

[0124]

[0125] In this application, according to the export loop safety factor k EXLP , Before starting to fill the sleeve, the amount of sleeve that can be used for filling the sleeve at the outlet loop EXL EX-LP(i,1) 、Export loop design maximum set quantity L MAX-EXLP , furnace zone speed target value v when the furnace zone speed drops rapidly Fsd , furnace zone acceleration a F And the furnace zone speed v F(i,1) , get the longest processing time EXt of the furnace area speed reduction outlet fault EX2(i,1) , the calculation formula is as follows:

[0126]

[0127] In order to make it easier for those skilled in the art to understand this application, the following reference will be made to Figures 4-10 The present application is described with a specific embodiment.

[0128] Figure 4 A time series diagram of the automatic step speed and duration of the continuous exit area in a specific embodiment of the present application is shown.

[0129] Figure 5 A line graph shows the impact of furnace zone speed reduction on the furnace zone limit speed before and after automatic step optimization of the exit section and after a fault when the steel coil is not divided in a specific embodiment of the present application.

[0130] Figure 6 A line graph showing the effect of furnace zone speed reduction on the furnace zone limit speed before and after automatic step optimization of the exit section and after a fault when a steel coil is divided into two in a specific embodiment of the present application is shown.

[0131] Figure 7 A line graph shows the effect of furnace zone speed reduction on the furnace zone limit speed before and after automatic step optimization of the exit section and after a fault when a steel coil is divided into three parts in a specific embodiment of the present application.

[0132] Figure 8 The figure shows the influence of the process parameters of the exit area on the limiting speed of the furnace area before and after optimization when the steel coil is not divided into coils in a specific embodiment of the present application.

[0133] Figure 9 The figure shows an analysis diagram of the impact of the process parameters of the exit area on the furnace zone limit speed before and after optimization when the steel coil is divided into two in a specific embodiment of the present application.

[0134] Figure 10 The figure shows the influence of the process parameters of the exit area on the furnace zone limit speed before and after optimization when the steel coil is divided into three parts in a specific embodiment of the present application.

[0135] Taking the 1700 annealing unit of Shougang Jingtang Cold Rolling Operation Department as an example, the automatic step of the exit section of Shougang Jingtang 1700 annealing unit is strategy 1. The details of the automatic step of the exit section are shown in Table 1. The basic parameters of the 1700 annealing unit are shown in Table 2. Combined with the production data, Figure 4 The time series diagram of the speed and duration of the 1700 consecutive retreat automatic steps is shown.

[0136] In order to increase the amount of sleeves that can be filled in the outlet sleeve before the outlet sleeve is withdrawn and improve the fault tolerance of the unit, the 1700 continuous exit automatic step is optimized. The process parameters before and after optimization are shown in Table 3. The main improvements are as follows: 1) Increase the outlet sleeve withdrawal speed and reduce the outlet sleeve withdrawal speed v EX1 From 600m / min to 700m / min; 2) Optimize the speed control to the crescent shear and the speed control to the crescent flying shear; 3) Increase the speed of the edge trimming shear and the edge trimming shear, and increase the speed from 30m / min to 45m / min. According to the number of exit rolls, it can be divided into the following three situations:

[0137] 1. Export without volume separation

[0138] When the exit is not divided into rolls, the influence of the exit section automatic step optimization on the furnace zone limit speed before and after is as follows: Figure 4 As shown. Figure 5 Figures (a) and (b) analyze the production rhythm of the 1700 continuous annealing furnace when the furnace speed is reduced to 120m / min and 80m / min, respectively. As shown in the figure, when the 1700 continuous annealing furnace speed is 320m / min, the minimum strip length is reduced from 1288m to 1502m before and after the automatic step optimization at the exit; the remaining looper volume increases from 37.70% to 43.67%; the fault handling time increases from 183s to 217s when the furnace speed target is 120m / min, and from 251s to 303s when the furnace speed target is 80m / min.

[0139] 2. Exports are divided into two

[0140] When the outlet is divided into two parts, the influence of the automatic step optimization of the outlet section on the furnace zone limit speed before and after is as follows: Figure 5 As shown. Figure 6Figures (a) and (b) analyze the production rhythm of the 1700 continuous annealing furnace when the furnace speed is reduced to 120m / min and 80m / min, respectively. As shown in the figure, when the 1700 continuous annealing furnace speed is 320m / min, the minimum strip length is reduced from 2214m to 1865m before and after the automatic step optimization at the exit; the remaining looper volume increases from 37.70% to 43.67%; the fault handling time for the furnace speed reduction target of 120m / min increases from 183s to 217s; and the fault handling time for the furnace speed reduction target of 80m / min increases from 251s to 303s.

[0141] 3. Exports: 1 / 3

[0142] When the outlet is one minute and three seconds, the influence of the automatic step optimization of the outlet section on the furnace zone limit speed before and after is as follows: Figure 6 As shown. Figure 7 Figures (a) and (b) analyze the production rhythm of the 1700 continuous annealing furnace when the furnace speed is reduced to 120m / min and 80m / min, respectively. As shown in the figure, when the 1700 continuous annealing furnace speed is 320m / min, the minimum strip length decreases from 3140m to 2678m before and after the automatic step optimization at the exit; the remaining looper volume increases from 37.70% to 43.67%; the fault handling time increases from 183s to 217s when the furnace speed target is 120m / min, and from 251s to 303s when the furnace speed target is 80m / min.

[0143] In summary, coil splitting does not affect the remaining coil quantity or the processing time after speed reduction, but it does affect the minimum strip length. At a furnace speed of 320m / min, the minimum strip length required for the 1700 continuous annealing process is reduced from 1288m, 2214m, and 3140m to 1502m, 1865m, and 2678m, respectively, for no coil splitting at the exit, one-two splitting, and one-three splitting.

[0144] By reducing the time tEXf of the exit section following the furnace zone from 120s to 40s, increasing the sleeve extraction speed vEXi from 600m / min to 700m / min, and increasing the speed of the 1700 continuous evacuation and 2230 continuous evacuation entering the trimming shear vEX3 and passing the trimming shear vEX4 from 30m / min and 45m / min to 45m / min and 60m / min respectively, the relationship between the average value of the limit speed of the furnace zone of different specifications of 1700 continuous evacuation and the coil weight and the maximum sleeve quantity of the exit sleeve control before and after the optimization of the exit section process parameters is obtained, as shown in the figure below: Figure 8 、 Figure 9 、 Figure 10 shown.

[0145] Depend on Figure 8It can be seen that when the coils are not separated at the export, when the coil weights are 23.2t and 27t respectively, and the maximum loop volume of the production-limited export loop is 70%, the average value of the limit speed of furnace zones of different specifications increases from 302m / min and 280m / min to 353m / min and 338m / min respectively.

[0146] Depend on Figure 9 It can be seen that when the exit is divided into two, when the coil weights are 23.2t and 27t respectively, and the maximum loop volume of the production-limited exit loop is 70%, the average value of the limit speed of furnace zones of different specifications increases from 232m / min and 214m / min to 299m / min and 283m / min respectively.

[0147] Depend on Figure 10 It can be seen that when the export is divided into three parts, when the coil weights are 23.2t and 27t respectively, and the maximum loop volume of the production-limited export loop is 70%, the average value of the limit speed of furnace zones of different specifications increases from 191m / min and 195m / min to 253m / min and 262m / min.

[0148]

[0149]

[0150] Table 1

[0151]

[0152]

[0153] Table 2

[0154]

[0155] Table 3

[0156] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0157] The method for setting the furnace zone speed of a continuous annealing production line proposed in this application can quantitatively calculate the furnace zone limit speed of strip steel of different specifications, steel grades, and coil weights under complex and changeable production conditions at the export site.

[0158] Through the method for setting the furnace zone speed of a continuous annealing production line proposed in this application, key process parameters such as the minimum strip length required to maintain the empty sleeve quantity at the outlet and the outlet fault processing time can also be obtained, and based on the key process parameters, the speed setting of the outlet section and the furnace section during abnormal conditions can be guided to avoid unplanned shutdown accidents caused by excessive outlet live sleeve quantity.

[0159] The method for setting the furnace zone speed of a continuous annealing production line proposed in this application can quantitatively analyze the impact of outlet process parameters on the furnace zone speed limit, and clarify the problems and research goals that need to be tackled before the unit speed is increased.

[0160] The following describes an apparatus embodiment of the present application, which can be used to implement the method for setting the furnace zone speed of a continuous annealing line according to the first aspect of the above-mentioned embodiments of the present application. For details not disclosed in the apparatus embodiment of the present application, please refer to the embodiment of the method for setting the furnace zone speed of a continuous annealing line according to the first aspect of the above-mentioned embodiments of the present application.

[0161] Figure 11 A block diagram of a device for setting the furnace zone speed of a continuous annealing production line in an embodiment of the present application is shown.

[0162] like Figure 11 As shown, the setting device 1100 for the furnace zone speed of the continuous annealing production line in an embodiment of the present application includes: a first construction unit 1101, a second construction unit 1102, a third construction unit 1103, a fourth construction unit 1104 and a determination unit 1105.

[0163] Among them, the first construction unit 1101 is used to construct the first exit section automatic step model and the second exit section automatic step model based on the exit withdrawal speed limited by the strip length balance at the skin-pass mill and the exit withdrawal speed limited by the strip length balance from the skin-pass mill to the trimming shear; the second construction unit 1102 is used to construct the exit looper relative displacement model based on the exit automatic step duration, the exit automatic step speed and the furnace zone speed; the third construction unit 1103 is used to construct the exit evacuation looper shortest strip length model based on the furnace zone speed and the looper increase during exit filling; the fourth construction unit 1104 is used to construct the exit looper remaining loop model based on the looper increase during exit filling; the determination unit 1105 is used to determine the furnace zone speed limitation model based on the first exit section automatic step model, the second exit section automatic step model, the exit looper relative displacement model, the exit evacuation looper shortest strip length model and the exit looper remaining loop model, and determine the furnace zone speed limitation model of the continuous annealing production line based on the furnace zone speed limitation model.

[0164] In some embodiments of the present application, based on the aforementioned solution, the first construction unit 1101 is configured as follows:

[0165]

[0166]

[0167] v EX2 =min(v op-SPM ,v op-WN ,v EXmax),

[0168]

[0169]

[0170] Among them, v EX1 is the SPM&DCR speed across the weld, in m / min; t EX1 For SPM&DCR through weld with v EX1 Hold time, in seconds; v F(i,1) is the furnace speed, in m / min; a EX is the acceleration of the exit section, in m / s 2 ;v op-SPM v is the exit withdrawal speed from the skin pass mill to the trimming shear strip steel balance limit, in m / min; EX2 The speed after the leveling machine is controlled in m / min; t EX2 After the leveling machine, v EX2 Hold time, in seconds; v EX3 The speed of the trimming shear is m / min; t EX3 Before cutting, use v EX1 Hold time, in seconds; v op-WN The maximum withdrawal speed at the outlet during the automatic step of the side trimming shear is in m / min; L SPM-WN v is the distance from the leveling machine to the trimming shear, in m; EXmax v is the maximum extraction speed at the outlet, in m / min; SPM-WN The maximum withdrawal speed of the outlet during the automatic step from the leveling machine to the trimming shear, in m / min; v EX4 is the shearing speed in m / min; t EX4 To cut the edge with v EX4 Hold time, in seconds; v EX5 The maximum withdrawal speed at the outlet before the flying shear enters the automatic step, in m / min; L WN-FS v is the distance from the trimming shear to the flying shear, in m; EX6 It is the flying shear preparation speed, in m / min.

[0171] In some embodiments of the present application, based on the aforementioned solution, the first construction unit 1101 is further configured to:

[0172]

[0173] v EX5 =min(v op-SPM ,v op-FS ,v EXmax ),

[0174]

[0175] Among them, v op-FS The exit withdrawal speed from the skin-pass mill to the flying shear strip is limited by the balance, in m / min; t EX5 Before entering the flying shear, EX5 Hold time, in seconds; t EX6 Before entering the flying shear, EX6 Hold time, in seconds; L SPM-FS The distance from the leveling machine to the flying shear, in m.

[0176] In some embodiments of the present application, based on the above solution, the second construction unit 1102 is configured as follows:

[0177]

[0178]

[0179] ΔL EX(i,1) =L EX-in(i,1) -L EX-out(i,1)

[0180] Among them, L EX-out(i,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; t EXk v is the duration of the kth automatic step at the exit, in seconds; EXk The exit speed corresponding to the kth automatic step of the exit is in m / min; L mEX-out(i,1) The displacement of the mth sub-roll at the outlet of the outlet loop during the outlet filling period, in m; EX1 The sum of the absolute values ​​of the square differences between adjacent automatic steps of strategy 1, in units of m 2 / min 2 ;Λ EX2 The sum of the absolute values ​​of the squared differences between adjacent automatic steps of strategy 2, in units of m 2 / min 2 ; m is the export sub-volume number; L EX-in(i,1) AtuoM is the displacement of the strip at the entrance of the outlet loop during the outlet filling period, in m; k The automatic step status of the outlet sleeve change, crescent cutting, and trimming shear knife adjustment, 1 means activated, 0 means closed; Λ EX3 The sum of the absolute values ​​of the speed differences between adjacent automatic steps, in m / min; EX4 The sum of the absolute values ​​of the speed differences between adjacent automatic steps, m / min; L mEX-out(i,1) The displacement of the mth sub-roll at the entrance of the outlet loop during the outlet filling period, in m; ΔL EX(i,1)It is the relative displacement of the strip in the outlet loop when the outlet loop is filled, that is, the increase in the length of the outlet loop, the unit is m.

[0181] In some embodiments of the present application, based on the above solution, the third construction unit 1103 is configured as follows:

[0182]

[0183] Among them, v EX(i,1) is the outlet sleeve speed, in m / min; t EXf The length of time the outlet follows the furnace speed, in seconds; L EX-stp(i,1) ΔL is the shortest strip length required by the outlet evacuation sleeve at different furnace speeds, in meters; EX(i,1) The relative displacement of the strip in the outlet loop when filling the loop, that is, the increase in the length of the outlet loop, in meters; L EX-out(I,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; N c The number of export volumes.

[0184] In some embodiments of the present application, based on the above solution, the fourth building unit 1104 is:

[0185] EXL EX-LP(i,1) =(ab·ΔL EX(i,1) ) / 100

[0186] Among them, EXL EX-LP(i,1) The amount of sleeves available for filling before the outlet starts filling, in %; ΔL EX(i,1) It is the increase of loop amount during the export filling period, the unit is m; a is the maximum loop amount, the value range is 90~99, b is the rate of change of loop amount with strip length, the value range is 0.02~0.2, the unit is % / m.

[0187] In some embodiments of the present application, based on the above solution, the determining unit 1105 is configured to:

[0188] v EXmax(i,j) =F1(L EX-STP(i,j) ),

[0189]

[0190] v EXLPmax =F2(L EXLPmax ),

[0191] v F-EXmax(i,j) =min(v EXmax(i,j) ,v EXLPmax )

[0192] Among them, v F-EXmax(i,j)v is the limit value of the annealing furnace's maximum speed at the outlet, in m / min; EXmax(i,j) v is the speed limit of the furnace area for the export production rhythm, the unit is m / min; EXLPmax The maximum speed of the furnace zone corresponding to the maximum set of the exit looper limited by production, in m / min; v EXmax(i,j) It is the limitation of the furnace speed under the outlet production rhythm under different incoming material lengths, in m / min; L stp-max(i,j) L is the length of the incoming material, in m; EXLPmax The maximum number of export loops limited by production, in %; v EXLPmax The maximum speed of the furnace zone corresponding to the maximum amount of exit loops limited by production, in m / min.

[0193] In some embodiments of the present application, based on the aforementioned scheme, the device also includes a fifth construction unit, which is used to construct a maximum processing time model for export faults based on the first export section automatic step model, the second export section automatic step model, the export looper relative displacement model, the export evacuation looper shortest strip length model and the export looper remaining loop model.

[0194] In some embodiments of the present application, based on the aforementioned solution, the fifth building unit is configured as follows:

[0195] L EXLP(i,1) =k EXLP ·L MAX-EXLP EXL EX-LP(i,1) ,

[0196]

[0197]

[0198] Among them, L EXLP(i,1) The length of strip steel that can be filled in the exit loop at different furnace speeds, in meters; EXt EX1(i,1) The maximum processing time of the furnace zone non-speed reduction outlet fault, in seconds; EXL EX-LP(i,1) The amount of the outlet loop that can be used to fill the loop before the outlet starts to withdraw the loop, in %; k EXLP L is the safety factor of the outlet loop, dimensionless; MAX-EXLP The maximum design volume of the export looper, in m; v Fsd is the target value of the furnace speed when the furnace speed drops sharply, in m / min; a F is the furnace zone acceleration, in m / s2; EXt EX2(i,1) The maximum processing time for the furnace zone speed reduction outlet fault, in seconds.

[0199] The present application also provides a computer program product, which includes computer instructions, which are stored in a computer-readable storage medium and are suitable for being read and executed by a processor, so that a computer device having the processor executes the method for setting the furnace zone speed of the continuous annealing production line as described in the above embodiment.

[0200] This application also provides a computer-readable medium, which may be included in an electronic device or exist independently without being incorporated into the electronic device. The computer-readable storage medium stores at least one program code, which is loaded and executed by a processor to implement the method for setting the furnace zone speed of a continuous annealing line described in the above embodiment.

[0201] The present application also provides an electronic device, which includes one or more processors and one or more memories, wherein the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the method for setting the furnace zone speed of the continuous annealing production line described in any of the above embodiments.

[0202] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0203] Furthermore, the above-mentioned figures are merely illustrative of the processes included in the methods according to exemplary embodiments of the present application and are not intended to be limiting. It is readily understood that the processes illustrated in the above-mentioned figures do not indicate or limit the temporal order of these processes. Furthermore, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0204] It should be understood that the present application is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for setting the furnace zone speed of a continuous annealing production line, characterized in that: The method comprises: Based on the strip length balance limit of the skin-pass mill and the strip length balance limit of the skin-pass mill to the trimming shear, the automatic step model of the first and second exit sections is constructed. Based on the exit automatic step duration, exit automatic step speed and furnace zone speed, the exit loop relative displacement model is constructed; Based on the furnace zone speed and the amount of looper increase during the outlet filling period, a minimum strip length model for the outlet evacuation looper is constructed; Based on the increase in the looper during the outlet filling period, a model for the remaining looper quantity at the outlet is constructed; Determine a furnace zone speed limiting model based on the first exit section automatic step model, the second exit section automatic step model, the exit looper relative displacement model, the exit evacuation looper shortest strip length model, and the exit looper remaining looping quantity model, and determine the furnace zone speed of the continuous annealing production line based on the furnace zone speed limiting model; The first exit section automatic step model includes: v EX2 =min(v op-SPM ,v op-WN ,v EXmax ), Among them, v EX1 is the SPM&DCR speed across the weld, in m / min; t EX1 For SPM&DCR through weld with v EX1 Hold time, in seconds; v F(i,1) is the furnace speed, in m / min; a EX is the acceleration of the exit section, in m / s 2 ;v op-SPM v is the exit withdrawal speed from the skin pass mill to the trimming shear strip steel balance limit, in m / min; EX2 The speed after the leveling machine is controlled in m / min; t EX2 After the leveling machine, v EX2 Hold time, in seconds; v EX3 The speed of the trimming shear is m / min; t EX3 Before cutting, use v EX1 Hold time, in seconds; v op-WN The maximum withdrawal speed at the outlet during the automatic step of the side trimming shear is in m / min; L SPM-WN v is the distance from the leveling machine to the trimming shear, in m; EXmax v is the maximum extraction speed at the outlet, in m / min; SPM-WN The maximum withdrawal speed of the outlet during the automatic step from the leveling machine to the trimming shear, in m / min; v EX4 is the shearing speed in m / min; t EX4 To cut the edge with v EX4 Hold time, in seconds; v EX5 The maximum withdrawal speed at the outlet before the flying shear enters the automatic step, in m / min; L WN-FS v is the distance from the trimming shear to the flying shear, in m; EX6 The flying shear preparation speed is in m / min; The second exit section automatic step model includes: v EX5 =min(v op-SPM ,v op-FS ,v EXmax ), Among them, v op-FS The exit withdrawal speed from the skin-pass mill to the flying shear strip is limited by the balance, in m / min; t EX5 Before entering the flying shear, EX5 Hold time, in seconds; t EX6 Before entering the flying shear, EX6 Hold time, in seconds; L SPM-FS The distance from the leveling machine to the flying shear, in m; The relative displacement model of the outlet looper includes: ΔL EX(i,1) =L EX-in(i,1) -L EX-out(i,1) Among them, L EX-out(i,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; t EXk v is the duration of the kth automatic step at the exit, in seconds; EXk The exit speed corresponding to the kth automatic step of the exit is in m / min; L mEX-out(i,1) The displacement of the mth sub-roll at the outlet of the outlet loop during the outlet filling period, in m; EX1 The sum of the absolute values ​​of the square differences between adjacent automatic steps of strategy 1, in units of m 2 / min 2 , Strategy 1 is that after the strip passes through the leveler, it first passes through the trimming shear and then enters the flying shear; Λ EX2 The sum of the absolute values ​​of the squared differences between adjacent automatic steps of strategy 2, in units of m 2 / min 2 Strategy 2 is that the strip enters the flying shear directly after passing through the skin-pass mill; m is the exit sub-roll number; L EX-in(i,1) AtuoM is the displacement of the strip at the entrance of the outlet loop during the outlet filling period, in m; k The automatic step status of the outlet sleeve change, crescent cutting, and trimming shear knife adjustment, 1 means activated, 0 means closed; Λ EX3 is the sum of the absolute values ​​of the speed differences between adjacent automatic steps of strategy 1, in m / min; EX4 is the sum of the absolute values ​​of the speed differences between adjacent automatic steps of strategy 2, m / min; L mEX-in(i,1) The displacement of the mth sub-roll at the entrance of the outlet loop during the outlet filling period, in m; △L EX(i,1) The relative displacement of the strip in the outlet loop when filling the loop, that is, the increase in the length of the outlet loop, in meters; The outlet evacuation looper shortest strip length model includes: Among them, v EX(i,1) is the outlet sleeve speed, in m / min; t EXf The length of time the outlet follows the furnace speed, in seconds; L EX-stp(i,1) The shortest strip length required by the outlet evacuation sleeve at different furnace speeds, in meters; △L EX(i,1) The relative displacement of the strip in the outlet loop when filling the loop, that is, the increase in the length of the outlet loop, in meters; L EX-out(I,1) The displacement of the strip at the exit of the exit looper during the exit filling period, in m; N c The number of export volumes; The export loop remaining quantity model includes: EXL EX-LP(i,1) =(a-b·ΔL EX(i,1) ) / 100 Among them, EXL EX-LP(i,1) The amount of sleeves available for filling before the outlet starts filling, in %; △L EX(i,1) The increment of looper during the export filling period, unit is m; a is the maximum looper amount, ranging from 90 to 99; b is the rate of change of looper amount with strip length, ranging from 0.02 to 0.2, unit is % / m; The furnace zone speed limiting model includes: v EXmax(i,j) =F1(L EX-STP(i,j) ), and EXLPmax =F2(L EXLPmax ), v F-EXmax(i,j) =min(v EXmax(i,j) ,v EXLPmax ) Among them, v F-EXmax(i,j) v is the limit value of the annealing furnace's maximum speed at the outlet, in m / min; EXmax(i,j) v is the speed limit of the furnace zone under the outlet production rhythm under different incoming material lengths, the unit is m / min; EXLPmax The maximum speed of the furnace zone corresponding to the maximum amount of exit loops limited by production, in m / min; L EX-STP(i,j) L is the length of the incoming material, in m; EXLPmax The maximum number of export loops limited by production, in %; v EXLPmax The maximum speed of the furnace zone corresponding to the maximum amount of exit loops limited by production, in m / min.

2. The method according to claim 1, characterized in that The method further comprises: Based on the first outlet section automatic step model, the second outlet section automatic step model, the outlet looper relative displacement model, the outlet evacuation looper shortest strip length model and the outlet looper remaining loop quantity model, a longest outlet fault processing time model is constructed.

3. The method according to claim 2, characterized in that The maximum processing time model for an egress fault includes: L EXLP(i,1) =k EXLP ·L MAX-EXLP ·EXL EX-LP(i,1) , Among them, L EXLP(i,1) The length of strip steel that can be filled in the exit loop at different furnace speeds, in meters; EXt EX1(i,1) The maximum processing time of the furnace zone non-speed reduction outlet fault, in seconds; EXL EX-LP(i,1) The amount of the outlet loop that can be used to fill the loop before the outlet starts to withdraw the loop, in %; k EXLP L is the safety factor of the outlet loop, dimensionless; MAX-EXLP The maximum design volume of the export looper, in m; v Fsd is the target value of the furnace speed when the furnace speed drops sharply, in m / min; a F is the furnace zone acceleration, in m / s 2 ;EXt EX2(i,1) The maximum processing time for the furnace zone speed reduction outlet fault, in seconds.

4. A device for setting the speed of a furnace zone of a continuous annealing production line, the device being used to implement the method according to any one of claims 1 to 3, characterized in that: The device comprises: The first construction unit is used to construct the first outlet section automatic step model and the second outlet section automatic step model based on the outlet withdrawal speed limited by the strip length balance at the skin-pass mill and the outlet withdrawal speed limited by the strip length balance from the skin-pass mill to the trimming shear; The second construction unit is used to construct the relative displacement model of the outlet looper based on the outlet automatic step duration, outlet automatic step speed and furnace zone speed; The third construction unit is used to construct a minimum strip length model for the outlet evacuation looper based on the furnace zone speed and the looper increase during the outlet filling period; The fourth construction unit is used to construct a model of the remaining amount of the outlet looper based on the amount of the looper increase during the outlet looper filling period; The determination unit is used to determine the furnace zone speed limiting model based on the first exit section automatic step model, the second exit section automatic step model, the exit looper relative displacement model, the exit evacuation looper shortest strip length model and the exit looper remaining loop model, and determine the furnace zone speed of the continuous annealing production line based on the furnace zone speed limiting model.

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