A control method and apparatus for a finish rolling device

Abstract

The application relates to the technical field of finish rolling, in particular to a control method and device of a finish rolling equipment. The finish rolling equipment comprises at least two finish rolling racks, a dummy block is arranged between the finish rolling racks, the method comprises the following steps: obtaining strip steel production data of a previous rolling period in one rolling period; determining a speed compensation coefficient in the current rolling period according to the strip steel production data; and controlling the finish rolling rack speed of the finish rolling rack in the current rolling period based on the speed compensation coefficient. The technical scheme provided by the application can accurately obtain the speed compensation coefficient to some extent, thereby accurately adjusting the rolling speed, ensuring the stability of the inter-rack second flow, making the strip steel head more stable, and reducing the products that are unqualified in terms of plate shape or size.

Description

Technical Field

[0001] The present application relates to the technical field of finishing rolling, and in particular to a control method and device for finishing rolling equipment. Background Art

[0002] Currently, controlling the second flow rate at the head of strip steel primarily relies on the set accuracy of computer process control models. However, during the strip rolling process, many uncontrollable factors interfere with the computer process control model, such as the wave shape of the strip between stands, equipment accuracy deviations, and the operator's manual intervention speed, all of which affect the model's set accuracy. Currently, most methods use a method to control the second flow rate by determining the height of the current piece of steel looper and generating a speed compensation coefficient to apply to the speed calculation of the next piece of steel. However, this method ignores many unstable factors, and the resulting set value is inaccurate.

[0003] Based on this, technicians in this field have developed a control method for finishing rolling equipment, which can accurately obtain the speed compensation coefficient, thereby accurately adjusting the rolling speed, ensuring the stability of the second flow rate between frames, making the strip head threading more stable, and at the same time reducing products with unqualified plate shape or size. Summary of the Invention

[0004] The embodiments of the present application provide a control method and device for finishing rolling equipment, thereby accurately obtaining at least the speed compensation coefficient, thereby accurately adjusting the rolling speed, ensuring the stability of the second flow rate between frames, making the strip head threading more stable, and reducing products with unqualified plate shape or size.

[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 one aspect of an embodiment of the present application, a control method for finishing rolling equipment is provided, wherein the finishing rolling equipment includes at least two finishing rolling stands, and a loop is arranged between the finishing rolling stands. The method includes: within a rolling cycle, obtaining strip production data of a previous rolling cycle; determining a speed compensation coefficient within a current rolling cycle based on the strip production data; and controlling the finishing rolling stand speed of the finishing rolling stand within the current rolling cycle based on the speed compensation coefficient.

[0007] In some embodiments of the present application, determining the speed compensation coefficient within the current rolling cycle based on the strip production data includes: calculating the angle characteristic value of the loop based on the strip production data; and determining the speed compensation coefficient within the current rolling cycle based on the angle characteristic value and the strip production data.

[0008] In some embodiments of the present application, based on the aforementioned scheme, the angle characteristic values ​​include the maximum value of the loop angle, the relative maximum value of the loop angle, the absolute maximum value of the loop angle, the average value of the loop angle, the relative average value of the loop angle, and the absolute average value of the loop angle.

[0009] In some embodiments of the present application, based on the aforementioned scheme, the speed compensation coefficient in the current rolling cycle is determined based on the angle characteristic value and the strip production data, including: obtaining a preset angle characteristic value; determining a target calculation method for the speed compensation coefficient in the current cycle based on the size relationship between the angle characteristic value and the preset angle characteristic value; calculating the speed compensation coefficient in the current cycle according to the target calculation method based on the strip production data and the angle characteristic value.

[0010] In some embodiments of the present application, controlling the finishing mill speed of the finishing mill in the current rolling cycle based on the speed compensation coefficient includes: calculating a cumulative speed compensation coefficient based on the speed compensation coefficient; and controlling the finishing mill speed of the finishing mill in the current rolling cycle according to the cumulative speed compensation coefficient.

[0011] In some embodiments of the present application, based on the aforementioned scheme, the cumulative speed compensation coefficient is calculated based on the speed compensation coefficient, including: correcting the speed compensation coefficient according to the size relationship between the speed compensation coefficient and the first preset coefficient limit; and calculating the cumulative speed compensation coefficient based on the corrected speed compensation coefficient.

[0012] In some embodiments of the present application, based on the aforementioned scheme, the calculation of the cumulative speed compensation coefficient based on the corrected speed compensation coefficient includes: obtaining the cumulative speed compensation coefficient of the previous rolling cycle from the strip production data; and calculating the cumulative speed compensation coefficient based on the cumulative speed compensation coefficient of the previous rolling cycle and the corrected speed compensation coefficient.

[0013] In some embodiments of the present application, based on the aforementioned scheme, controlling the finishing mill speed of the finishing mill in the current rolling cycle according to the cumulative speed compensation coefficient includes: correcting the cumulative speed compensation coefficient according to the size relationship between the cumulative speed compensation coefficient and a second preset coefficient limit; and controlling the finishing mill speed of the finishing mill in the current rolling cycle according to the corrected cumulative speed compensation coefficient.

[0014] In some embodiments of the present application, based on the aforementioned scheme, the finishing mill speed of the finishing mill in the current rolling cycle is controlled according to the corrected cumulative speed compensation coefficient, including: determining the speed compensation multiple according to the corrected cumulative speed compensation coefficient; and controlling the finishing mill speed of the finishing mill in the current rolling cycle according to the speed compensation multiple.

[0015] According to one aspect of an embodiment of the present application, a finishing rolling equipment control device is provided, wherein the finishing rolling equipment includes at least two finishing rolling stands, and a loop is arranged between the finishing rolling stands. The finishing rolling equipment control device includes: an acquisition unit, which is used to acquire the strip production data of the previous rolling cycle within a rolling cycle; a determination unit, which is used to determine the speed compensation coefficient within the current rolling cycle based on the strip production data; and a control unit, which is used to control the finishing rolling stand speed of the finishing rolling stand within the current rolling cycle based on the speed compensation coefficient.

[0016] In the technical solutions provided in some embodiments of the present application, the speed compensation coefficient in the current rolling cycle is determined by acquiring the strip production data of the previous rolling cycle, and the finishing stand speed of the finishing stand in the current rolling cycle is controlled. Since the various types of strip production data of the previous rolling cycle are comprehensively considered in the process of calculating the speed compensation coefficient, the speed compensation coefficient can be accurately obtained, thereby accurately adjusting the rolling speed, ensuring the stability of the second flow rate between stands, making the strip head threading more stable, and reducing products with unqualified plate shape or size.

[0017] 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

[0018] 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, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and a person skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0019] Figure 1 A flow chart showing a method for controlling a finishing rolling mill according to an embodiment of the present application is shown;

[0020] Figure 2 A flow chart showing a method for controlling a finishing rolling mill according to an embodiment of the present application is shown;

[0021] Figure 3 A flow chart showing a method for controlling a finishing rolling mill according to an embodiment of the present application is shown;

[0022] Figure 4 A flow chart showing a method for controlling a finishing rolling mill according to an embodiment of the present application is shown;

[0023] Figure 5 A flow chart showing a method for controlling a finishing rolling mill according to an embodiment of the present application is shown;

[0024] Figure 6 A simplified diagram of a finishing mill control device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] See also Figure 1 .

[0030] Figure 1 A flow chart of a control method for a finishing rolling mill according to an embodiment of the present application is shown, wherein the finishing rolling mill comprises at least two finishing rolling mill stands, and a looper is provided between the finishing rolling mill stands, such as Figure 1 As shown, the method may include steps S101-S103:

[0031] Step S101: within a rolling cycle, obtaining strip steel production data of the previous rolling cycle.

[0032] Step S102: determining a speed compensation coefficient in a current rolling cycle according to the strip production data.

[0033] Step S103: controlling the speed of the finishing stand in the current rolling cycle based on the speed compensation coefficient.

[0034] In the present application, the speed compensation coefficient in the current rolling cycle can be determined by obtaining the strip production data of the previous rolling cycle, and the finishing stand speed of the finishing stand in the current rolling cycle can be controlled. Since the various types of strip production data of the previous rolling cycle are comprehensively considered in the process of calculating the speed compensation coefficient, the speed compensation coefficient can be accurately obtained, thereby accurately adjusting the rolling speed, ensuring the stability of the second flow rate between stands, making the strip head threading more stable, and reducing products with unqualified plate shape or size.

[0035] In the present application, the adjustment control parameters can be set or defined first, and the adjustment control parameters can provide preset values ​​or calculated values ​​for subsequent calculations, all of which are parameters related to the strip finishing process: speed compensation adjustment coefficient: Speedtrim gain, speed and looper angle conversion coefficient Speed ​​agl gain, roll gap and looper angle conversion coefficient Gap aglgain, looper high adjustment coefficient High agl gain, looper low adjustment coefficient Low agl gain, single speed adjustment upper limit Speed ​​change limit (that is, the first preset coefficient limit described later), cumulative speed adjustment upper limit Speedtrim limit (that is, the second preset coefficient limit described later), looper angle maximum value benchmark upper limit Agl max upper, looper angle maximum value benchmark lower limit Agl max lower, looper angle average benchmark upper limit Agl ave upper, looper angle average benchmark lower limit Agl ave lower, looper angle maximum value sampling starting point max start, looper angle maximum value sampling ending point max end, looper angle average sampling starting point ave start, looper angle average sampling ending point aveend.

[0036] For example, on a hot finishing rolling production line, the settings of the adjustment control parameters can be shown in Table 1.

[0037] Using parameter names parameter Parameter value Speed ​​compensation adjustment coefficient (%) Speed ​​trim gain 03 Speed ​​and loop angle conversion coefficient (%) Speed ​​agl gai 0.2 Conversion coefficient of roll gap and loop angle (%) Gap agl gain 025 Looper high position adjustment coefficient (%) High agl gain 035 Looper low position adjustment coefficient (%) Low agl gain 03 Single speed adjustment upper limit (%) Speed ​​change limit 15 Accumulated speed adjustment upper limit (%) Speed ​​trim limit 25 Maximum reference limit of loop angle (deg) Agl max uppe 8 Loop angle maximum reference lower limit (deg) Agl max lower 0 Looper angle mean upper limit (deg) Agl ave upper 4 Loop angle mean reference lower limit (deg) Agl ave lower -3 Loop angle maximum sampling starting point max start 1 End point of maximum loop angle sampling max end 20 Set angle mean sampling starting point ave start 10 Loop angle mean sampling end point ave end 40

[0038] Table 1

[0039] See also Figure 2 .

[0040] Figure 2 A flow chart of a control method for a finishing rolling mill according to an embodiment of the present application is shown. Figure 2 As shown, the method for determining the speed compensation coefficient in the current rolling cycle according to the strip production data may include steps S201-S202:

[0041] Step S201: Calculate the angle characteristic value of the loop according to the strip production data.

[0042] Step S202: determining a speed compensation coefficient in a current rolling cycle based on the angle characteristic value and the strip production data.

[0043] In this application, the strip production data is the previous rolling cycle, or can be understood as the strip production data of the previous rolled strip, and therefore may include: single speed compensation coefficient old speed trim, cumulative speed compensation coefficient acc speed trim, stand roll gap horizontal adjustment amount g, stand speed adjustment amount v, loop angle real-time sampling value Agl(i), where i is a positive integer, loop angle setting value Agl ref, finishing stand speed V and finishing stand set roll gap G.

[0044] In the present application, the angle characteristic values ​​may include a maximum value of a loop angle, a relative maximum value of a loop angle, an absolute maximum value of a loop angle, an average value of a loop angle, a relative average value of a loop angle, and an absolute average value of a loop angle.

[0045] In this application, each angle characteristic value can be calculated according to the following formula.

[0046] In this application, the maximum loop angle can be calculated according to the following formula:

[0047]

[0048] Among them, Agl max is the maximum value of the loop angle, max start is the starting point of the maximum value sampling of the loop angle, maxend is the end point of the maximum value sampling of the loop angle, and Agl(i) is the real-time sampling value of the loop angle.

[0049] In this application, the average loop angle can be calculated according to the following formula:

[0050]

[0051] Among them, Agl ave is the average value of the loop angle, ave start is the starting point of the maximum loop angle sampling, aveend is the end point of the maximum loop angle sampling, and Agl(i) is the real-time sampling value of the loop angle.

[0052] In this application, the relative maximum value of the looper angle can be calculated according to the following formula:

[0053] rel Agl max =Agl max―Agl ref―V P / Speed ​​agl gain―G P / Gap agl gain

[0054] Among them, rel Agl max is the relative maximum value of the loop angle, Agl max is the maximum value of the loop angle, Agl ref is the set value of the loop angle, V P is the rack speed compensation coefficient, Speed ​​agl gain is the speed and looper angle conversion coefficient, G P is the roll gap compensation speed coefficient, and Gap agl gain is the roll gap and looper angle conversion coefficient.

[0055] In this application, the rack speed compensation coefficient can be calculated according to the following formula:

[0056] V P =v / V

[0057] Among them, V P is the rack speed compensation coefficient, v is the rack speed adjustment amount, and V is the finishing mill speed.

[0058] In this application, the roll gap compensation speed coefficient can be calculated according to the following formula:

[0059] G P =G / g

[0060] Among them, G P is the roll gap compensation speed coefficient, G is the set roll gap of the finishing mill stand, and g is the horizontal adjustment amount of the roll gap of the stand.

[0061] In this application, the relative average value of the looper angle can be calculated according to the following formula:

[0062] rel Agl ave =Agl ave ―Agl ref―V P / Speed ​​agl gain―G P / Gap agl gain

[0063] Among them, rel Agl ave is the relative average value of the loop angle, Agl ave is the average value of the loop angle, Agl ref is the set value of the loop angle, V P is the rack speed compensation coefficient, Speed ​​agl gain is the speed and looper angle conversion coefficient, G P is the roll gap compensation speed coefficient, and Gap agl gain is the roll gap and looper angle conversion coefficient.

[0064] In this application, the absolute maximum value of the looper angle can be calculated according to the following formula:

[0065] abs Agl max =Agl max ―V P / Speed ​​agl gain―G P / Gap agl gain

[0066] Among them, abs Agl max is the absolute maximum value of the loop angle, Agl max is the maximum value of the loop angle, V P is the rack speed compensation coefficient, Speed ​​agl gain is the speed and looper angle conversion coefficient, G P is the roll gap compensation speed coefficient, and Gap aglgain is the roll gap and looper angle conversion coefficient.

[0067] In this application, the absolute average value of the loop angle can be calculated according to the following formula:

[0068] abs Agl ave =Agl ave ―V P / Speed ​​agl gain―G P / Gap agl gain

[0069] Among them, abs Agl ave is the relative average value of the loop angle, Agl ave is the average value of the loop angle, V P is the rack speed compensation coefficient, Speed ​​agl gain is the speed and looper angle conversion coefficient, G P is the roll gap compensation speed coefficient, and Gap aglgain is the roll gap and looper angle conversion coefficient.

[0070] See also Figure 3 .

[0071] Figure 3 A flow chart of a control method for a finishing rolling mill according to an embodiment of the present application is shown. Figure 3 As shown, the method for determining the speed compensation coefficient in the current rolling cycle based on the angle characteristic value and the strip production data may include steps S301-S303:

[0072] Step S301: Obtain a preset angle characteristic value.

[0073] Step S302, determining a target calculation method for a speed compensation coefficient in a current cycle based on a magnitude relationship between the angle characteristic value and the preset angle characteristic value;

[0074] Step S303: Calculate the speed compensation coefficient in the current cycle based on the strip production data and the angle characteristic value according to the target calculation method.

[0075] In the present application, the preset angle characteristic values ​​may be a loop angle maximum reference upper limit Agl maxupper, a loop angle maximum reference lower limit Agl max lower, a loop angle average reference upper limit Agl ave upper, and a loop angle average reference lower limit Agl ave lower.

[0076] In this application, the relative maximum value of the loop angle and the relative average value of the loop angle can be used for calculation, or the absolute maximum value of the loop angle and the absolute average value of the loop angle can be used for calculation, that is, rel Agl max and abs Agl max One of the values ​​used as the maximum loop angle value Agl max use, you can use abs Agl ave and relAgl ave One of them is used as the loop mean value Agl ave use.

[0077] In this application, you can first ave Use and the upper limit of the loop angle mean benchmark Agl ave upper, as well as the lower limit of the loop angle mean benchmark Agl ave lower to make a preliminary judgment, and then according to Agl max Use the relationship between the maximum reference limit of the loop angle Agl max upper and the maximum reference limit of the loop angle Agl max lower to make an accurate judgment.

[0078] For example, see Figure 4 , Figure 4 A flow chart of a control method for a finishing rolling mill according to an embodiment of the present application is shown. Figure 4 As shown, first you need to choose whether to use absolute value control mode or relative value control mode, that is, select relAgl max and abs Agl max One of the values ​​used as the maximum loop angle value Agl max use, select abs Agl ave and relAgl aveOne of them is used as the loop mean value Agl ave use.

[0079] exist Figure 4 In the case of Agl ave If use>Agl ave upper, the looper is at a high position. At this time, the speed compensation coefficient can be calculated according to Formula 1.

[0080] Formula 1:

[0081] speed trim

[0082] =max((Agl ave use―Agl ave upper),(Agl max use―Agl max upper))

[0083] ×High agl gain

[0084] Among them, speed trim is the speed compensation coefficient, Agl ave Use is the average value of the loop, Agl ave upper is the upper limit of the average angle of the loop, Agl max Use is the maximum usage value of the looper angle, Agl max upper is the maximum benchmark upper limit of the looper angle, and High agl gain is the looper high adjustment coefficient.

[0085] exist Figure 4 In the case of Agl ave use<loop angle average reference lower limit Agl ave lower, and Agl max If use is less than the lower limit of the maximum value of the looper angle Agl max lower, it means that the looper is in a low position. At this time, the speed compensation coefficient can be calculated according to Formula 2.

[0086] Formula 2:

[0087] speed trim=(Agl ave use―Agl ave lower)×Low agl gain

[0088] Among them, speed trim is the speed compensation coefficient, Agl ave Use is the mean usage value of the looper, Agl ave lower is the lower limit of the mean benchmark of the looper angle, and Low agl gain is the low-position adjustment coefficient of the looper.

[0089] exist Figure 4 In the case of Agl aveuse < Agl ave lower, and the loop is in a high position, the speed trim factor can be calculated according to formula 3. max use > Agl max upper, it indicates that the loop is in a normal position, and the speed trim factor is 0.

[0090] In the case of Figure 4 , if Agl ave use < Agl ave lower, and the loop Agl max use > Agl max upper, it indicates that the loop is in a high position, the speed trim factor can be calculated according to formula 3.

[0091] Formula 3:

[0092] speed trim = (Agl max use - Agl max upper) x High agl gain

[0093] Wherein, speed trim is the speed trim factor, Agl max use is the maximum loop angle used value, Agl max upper is the maximum loop angle upper limit, and High agl gain is the high position adjustment coefficient of the loop.

[0094] In the case of Figure 4 , if Agl ave lower ≤ Agl ave use ≤ Agl ave upper, and Agl max use < Agl max lower, it indicates that the loop is in a low position, the speed trim factor can be calculated according to formula 4.

[0095] Formula 4:

[0096] speed trim = (Agl max use - Agl max lower) x Low agl gain

[0097] Wherein, speed trim is the speed trim factor, Agl max use is the maximum loop angle used value, Agl max lower is the maximum loop angle lower limit, and Low agl gain is the low position adjustment coefficient of the loop.

[0098] In the case of Figure 4If the loop angle average reference lower limit Agl ave lower≤Agl ave use≤Agl ave upper, and Agl max use>Agl max upper, it indicates that the loop is in the high position, and the speed compensation coefficient can be calculated according to formula 5.

[0099] In the Figure 4 If the loop angle average reference lower limit Agl ave lower≤Agl ave use≤Agl ave upper, and Agl max use>Agl max upper, it indicates that the loop is in the high position, and the speed compensation coefficient can be calculated according to formula 5.

[0100] Formula 5:

[0101] speed trim=(Agl max use―Agl max upper)×High agl gain

[0102] Wherein, speed trim is the speed compensation coefficient, Agl max use is the maximum loop angle value, Agl max upper is the maximum loop angle reference upper limit, and High agl gain is the high position adjustment coefficient of the loop.

[0103] Please refer to Figure 5 , Figure 5 The flow chart of the control method of the finishing equipment according to one embodiment of the application is shown in FIG. 1. Figure 5 As shown in FIG. 1, after the speed compensation coefficient is calculated, the speed compensation coefficient needs to be checked to determine whether it is out of limit.

[0104] In Figure 5 ,

[0105] Step S501: Determine the size relationship between the speed compensation coefficient and the first preset coefficient limit value. If the opposite number (-Speed change limit) of the first preset coefficient limit value≤speed trim≤the first preset coefficient limit value Speed change limit, execute step S502, otherwise execute step S503.

[0106] Step S502: No correction is performed, and step S504 is executed.

[0107] Step S503: When speed change limit>speed trim, then speed trim=Speed ​​change limit; when speed trim<-Speed ​​change limit, then speed trim=-Speed ​​change limit. Execute step S504.

[0108] Step S504: Calculate the cumulative speed compensation coefficient, and then execute step S505. In this application, the cumulative speed compensation coefficient acc speed trim can be calculated according to the following formula:

[0109] (acc speed trim) n =(acc speed trim) n―1 +(speed trim) n

[0110] Among them, (acc speed trim) n is the cumulative speed compensation coefficient of the nth rolling cycle, (acc speedtrim) n―1 is the cumulative speed compensation coefficient of the n-1th rolling cycle, (speed trim) n The speed compensation coefficient of the nth rolling cycle, n is an integer greater than 1.

[0111] Step S505, determine the size relationship between the accumulated speed compensation coefficient and the second preset coefficient limit. If the opposite of the second preset coefficient limit (-acc Speed ​​change limit) ≤ acc speed trim ≤ the second preset coefficient limit acc Speed ​​change limit, execute step S506; otherwise, execute step S507.

[0112] Step S506: No correction is performed, and step S508 is executed.

[0113] Step S507: When acc speed change limit < acc speed trim, then acc speed trim = acc Speed ​​change limit; when acc speed trim < -acc Speed ​​change limit, then accspeedtrim = -acc Speed ​​change limit. Execute step S508.

[0114] Step S508: Calculate the speed compensation multiple, and control the speed of the finishing stand in the current rolling cycle according to the speed compensation multiple.

[0115] In the present application, the speed compensation multiple may be (1+acc speed trim). Therefore, the finishing stand speed may be: stand speed = (stand speed) 0 × (1+acc speed trim).

[0116] Among them, stand speed is the compensated finishing stand speed, (stand speed)0 is the current finishing stand speed, and acc speed trim is the cumulative speed compensation coefficient.

[0117] In this application, the cumulative speed compensation coefficient and the speed compensation coefficient of the current rolling cycle can be recorded to provide data support for the calculation of the next rolling cycle.

[0118] Furthermore, in actual applications, after applying the control method provided by this application, the rolling stability of a certain hot-rolled steel strip was significantly improved. At the same time, the plate quality was improved, the dimensional anomaly rate was significantly reduced, and the risk of scrap steel was reduced. The results of comparing 15,000 pieces of steel before and after applying the method of the present invention can be shown in Table 2:

[0119] Plate blocking rate Size blocking rate scrap steel Before application 8.20％ 0.40％ 3 After application 5.80％ 0.25％ 1

[0120] Table 2

[0121] See also Figure 6 .

[0122] Figure 6 A simplified diagram of a control device for a finishing mill according to an embodiment of the present application is shown, wherein the finishing mill comprises at least two finishing mill stands, and a looper is provided between the finishing mill stands, such as Figure 6 As shown, the finishing equipment control device 600 may include: an acquisition unit 601 , a determination unit 602 , and a control unit 603 .

[0123] The specific configuration of the finishing rolling equipment control device 600 can be: an acquisition unit 601, which is used to acquire the strip production data of the previous rolling cycle within a rolling cycle; a determination unit 602, which is used to determine the speed compensation coefficient within the current rolling cycle based on the strip production data; and a control unit 603, which is used to control the finishing rolling stand speed of the finishing rolling stand within the current rolling cycle based on the speed compensation coefficient.

[0124] The present application can perform process control on the second flow rate of hot-rolled strip steel between the stands of the finishing mill, extract characteristic values ​​in the process of looper action control, and use these characteristic values ​​as reference values ​​in the control process to determine the high and low positions of the looper, thereby performing compensation calculation on the speed value in the process control for correcting the speed of the next piece of steel, making the second flow rate control between stands more accurate and stable, fully ensuring the stability of rolling, improving the quality of plate shape, reducing the dimensional abnormality rate, and reducing the risk value of scrap steel.

[0125] 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.

[0126] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A control method for finishing rolling equipment, characterized in that: The finishing rolling equipment includes at least two finishing rolling stands, a looper is provided between the finishing rolling stands, and the method includes: In one rolling cycle, the strip production data of the previous rolling cycle is obtained; determining a speed compensation coefficient within a current rolling cycle based on the strip production data; controlling the finishing stand speed of the finishing stand in a current rolling cycle based on the speed compensation coefficient; Determining the speed compensation coefficient in the current rolling cycle according to the strip production data includes: Calculating an angle characteristic value of the looper according to the strip steel production data; Determining a speed compensation coefficient in a current rolling cycle based on the angle characteristic value and the strip production data, including: obtaining a preset angle characteristic value; determining a target calculation method for the speed compensation coefficient in the current cycle based on a magnitude relationship between the angle characteristic value and the preset angle characteristic value; and calculating the speed compensation coefficient in the current cycle according to the target calculation method based on the strip production data and the angle characteristic value; The calculating of the speed compensation coefficient in the current cycle based on the strip production data and the angle characteristic value according to the target calculation method includes: Select relAgl max and abs Agl max One of the values ​​used as the maximum loop angle value Agl max use, select abs Agl ave and relAgl ave One of them is used as the loop mean value Agl ave use; among them, relAgl max is the relative maximum value of the loop angle, abs Agl max is the absolute maximum value of the loop angle, abs Agl ave is the absolute average value of the loop angle, abs Agl ave is the relative average value of the loop angle; If Agl ave If use>Agl ave upper, the looper is in a high position. In this case, the speed compensation coefficient is calculated according to Formula 1. Formula 1: speed trim=max((Agl ave use-Agl ave upper),(Agl max use -Agl max upper))×High agl gain Among them, speed trim is the speed compensation coefficient, Agl ave Use is the average value of the loop, Agl ave upper is the upper limit of the average reference of the loop angle, Agl max Use is the maximum value of the looper angle, Aglmax upper is the upper limit of the maximum looper angle, and High aglgain is the high-position adjustment coefficient of the looper. If Agl ave use<loop angle average reference lower limit Agl ave lower, and Agl max If use is less than the lower limit of the maximum value of the looper angle Agl max lower, it means that the looper is in the low position. At this time, the speed compensation coefficient is calculated according to Formula 2; Formula 2: speed trim=(Agl ave use-Agl ave lower)×Low agl gain Among them, speed trim is the speed compensation coefficient, Agl ave Use is the average value used for the looper, Agl ave lower is the lower limit of the average benchmark for the looper angle, and Low agl gain is the low-position adjustment coefficient for the looper; If Agl ave use<Agl ave lower, and Agl max lower≤Agl max If use≤Agl max upper, the looper is in the normal position and the speed compensation coefficient is 0. If Agl ave use<loop angle average benchmark lower limit Agl ave lower, and loop Agl max Use>Agl max upper, indicating that the looper is in a high position. In this case, the speed compensation coefficient is calculated according to Formula 3. Formula 3: speed trim=(Agl max use-Agl max upper)×High agl gain Among them, speed trim is the speed compensation coefficient, Agl max Use is the maximum value of the looper angle, Agl maxupper is the upper limit of the maximum value of the looper angle, and High agl gain is the high-position adjustment coefficient of the looper; If the loop angle mean reference lower limit Agl ave lower ≤ Agl ave use≤Aglave upper, the upper limit of the mean angle of the loop, and Aglave max If use is less than the lower limit of the maximum reference value of the looper angle Agl max lower, it means that the looper is in the low position. At this time, the speed compensation coefficient is calculated according to Formula 4; Formula 4: speed trim=(Agl max use-Agl maxlower)×Low agl gain Among them, speed trim is the speed compensation coefficient, Agl max Use is the maximum value of the looper angle, Aglmaxlower is the lower limit of the maximum value of the looper angle, and Low agl gain is the low-position adjustment coefficient of the looper; If the loop angle mean reference lower limit Agl ave lower ≤ Agl ave use≤Aglave upper, the upper limit of the mean angle of the loop, and Agl max lower, the lower limit of the maximum angle of the loop, ≤Agl max If use≤Agl max upper, the looper is in the normal position and the speed compensation coefficient is 0. If the loop angle mean reference lower limit Agl ave lower ≤ Agl ave use≤Aglave upper, the upper limit of the mean angle of the loop, and Aglave max If use>Agl max upper, the looper is in the high position. In this case, the speed compensation coefficient is calculated according to Formula 5. Formula 5: speed trim=(Agl max use-Aglmax upper)×High aglgain Among them, speed trim is the speed compensation coefficient, Agl max Use is the maximum usage value of the loop angle, Aglmaxupper is the upper limit of the maximum benchmark of the loop angle, and High aglgain is the high-position adjustment coefficient of the loop.

2. The method according to claim 1, characterized in that The angle characteristic values ​​include the maximum value of the loop angle, the relative maximum value of the loop angle, the absolute maximum value of the loop angle, the average value of the loop angle, the relative average value of the loop angle, and the absolute average value of the loop angle.

3. The method according to claim 1, characterized in that The controlling the finishing stand speed of the finishing stand in the current rolling cycle based on the speed compensation coefficient includes: Calculating a cumulative speed compensation coefficient based on the speed compensation coefficient; According to the accumulated speed compensation coefficient, the finishing stand speed of the finishing stand in the current rolling cycle is controlled.

4. The method according to claim 3, characterized in that The calculating of the cumulative speed compensation coefficient based on the speed compensation coefficient includes: Modifying the speed compensation coefficient according to a magnitude relationship between the speed compensation coefficient and a first preset coefficient limit; The cumulative speed compensation coefficient is calculated based on the corrected speed compensation coefficient.

5. The method according to claim 4, characterized in that The calculating of the cumulative speed compensation coefficient based on the corrected speed compensation coefficient includes: Obtaining a cumulative speed compensation coefficient of a previous rolling cycle from the strip production data; The cumulative speed compensation coefficient is calculated based on the cumulative speed compensation coefficient of the previous rolling cycle and the corrected speed compensation coefficient.

6. The method according to claim 3, characterized in that The controlling of the finishing stand speed of the finishing stand in the current rolling cycle according to the accumulated speed compensation coefficient includes: Modifying the cumulative speed compensation coefficient according to the magnitude relationship between the cumulative speed compensation coefficient and a second preset coefficient limit; According to the corrected cumulative speed compensation coefficient, the finishing stand speed of the finishing stand in the current rolling cycle is controlled.

7. The method according to claim 6, characterized in that Controlling the finishing stand speed of the finishing stand in the current rolling cycle according to the corrected cumulative speed compensation coefficient includes: According to the corrected cumulative speed compensation coefficient, determine the speed compensation multiple; According to the speed compensation multiple, the speed of the finishing mill stand in the current rolling cycle is controlled.

8. A finishing mill control device, applying the finishing mill control method according to any one of claims 1 to 7, characterized in that: The finishing rolling equipment includes at least two finishing rolling stands, a looper is provided between the finishing rolling stands, and the finishing rolling equipment control device includes: The acquisition unit is used to acquire the strip production data of the previous rolling cycle within a rolling cycle; a determination unit, configured to determine a speed compensation coefficient in a current rolling cycle based on the strip production data; The control unit is used to control the finishing stand speed of the finishing stand in a current rolling cycle based on the speed compensation coefficient.

Images