CN113102517B - Hot galvanizing four-roller temper mill elongation rate control method - Google Patents
Hot galvanizing four-roller temper mill elongation rate control method Download PDFInfo
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- CN113102517B CN113102517B CN202110527689.3A CN202110527689A CN113102517B CN 113102517 B CN113102517 B CN 113102517B CN 202110527689 A CN202110527689 A CN 202110527689A CN 113102517 B CN113102517 B CN 113102517B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/56—Elongation control
Abstract
The invention discloses an elongation control method of a hot galvanizing four-roller temper mill, and belongs to a production control method in the field of cold-rolled strip steel. The method firstly establishes a PID model parameter data storage variable, and calls PID parameter data and randomly fluctuates within a range of 5% when the head of a new coil of strip steel is close to a temper mill. And when the head of the strip steel passes through a temper mill and the deviation between the elongation and the target value is more than 0.2, executing a deviation statistical program, recording the maximum value of the elongation deviation and the PID (proportion integration differentiation) adjustment index within 30 seconds, judging whether the maximum value of the elongation deviation is more than the original stored data or not and whether the adjustment index is less than the original stored data or not, and if the two conditions are met simultaneously, storing the randomly fluctuated process parameters into a data storage variable in a covering manner. And the automatic updating process of the PID parameters is realized, and a better elongation rate control effect is realized.
Description
Technical Field
The invention relates to the field of cold-rolled strip steel production process automation, in particular to a control method for the elongation of strip steel of a cold-rolled temper mill.
Background
The elongation of a temper mill in a cold-rolling hot-galvanizing unit is a key process parameter of hot-galvanizing strip steel, and determines the final performance of the strip steel product. Fig. 1 shows a simple diagram of arrangement of a hot-dip galvanizing leveler in the prior art, a tension roller 2, a crease-resist roller 3 and a shake-proof roller 4 are arranged in front of and behind the leveler 1, and a strip steel 5 is leveled at the position of the leveler 1. The main control parameters of the leveling process are the leveling rolling force and the tension before and after leveling, the main control targets of the leveling process are the elongation of the steel coil and the surface quality of the steel coil, and the quality of the elongation control performance is directly related to the high and low quality of products. In the production process, the elongation rate has the characteristics of hysteresis, time variation, nonlinearity, difficulty in accurately establishing a mathematical model and the like, and particularly, the problem of the fluctuation of the elongation rate is more prominent in the processes of passing a welding seam and increasing and decreasing the speed of the temper mill.
At present, the most widely used in practical application is the conventional PID (proportion, integral and differential) control strategy, the principle is simple, the stability is good, but the conventional PID control usually sets fixed basic parameters in advance, and many patents are researched aiming at the off-line setting of the PID parameters, for example, Chinese patent CN104107837 provides a method for accurately controlling the elongation of the strip steel when a welding seam passes through a temper mill. The patent is a relatively basic control method. The Chinese patent CN105251780B subdivides PID control parameters corresponding to different strip steel speeds, and improves the control precision. Chinese patent CN102968055A controls the controlled object by using a fuzzy control algorithm, and generates three parameters of a PID controller according to a fuzzy principle;
the control method can better meet the working condition of the initial equipment state, but due to the limitation of the setting method, the control method is uncertain and can adapt to the frequent fluctuation state of the site. In addition, when the state of the field equipment changes, such as the conditions of abrasion of the leveling roller, change of a roller shape curve and the like, the ideal control effect is more difficult to realize by the prior offline-set PID parameters, so the elongation control of the leveling process can be more effectively realized by the control method with the online self-setting PID control parameters. The above contents indicate that a control method for the elongation of strip steel capable of being automatically optimized on line is needed to improve the yield of strip steel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a hot galvanizing four-roller temper mill elongation control method which improves the control speed and the control precision of the elongation and reduces the length of strip steel which is not consistent with the elongation. In order to achieve the purpose, the invention adopts the technical scheme that:
a hot galvanizing four-roller temper mill elongation control method comprises the following steps:
s1, storing the information in the PLC data structure block as PID model parameter factor Kp、Ki、KdAnd maximum value of elongation deviation e (t)maxAn adjustment amount index J;
the formula for calculating the adjustment index J is:
the formula for p (t) is:
wherein the integration time t is after the elongation rate begins to fluctuate for 30 s; p (t) is the output value of the rolling force adjustment amount, e (t) is the elongation deviation signal,
is a first order differential of the elongation deviation signal with respect to time; kpIs a proportionality coefficient, KiIs the integral coefficient, KdIs a differential coefficient; t isiTo integrate the time constant, TDIs a differential time constant;
s2, reading K from the PLC data structure block when the head of the strip steel does not reach the temper millp、Ki、KdInformation;
s3, a model parameter factor Kp、Ki、KdRandomly changing the parameters within the range of +/-5% of the original parameters; and the model parameter factor K 'after random variation'p、K'i、K'dAs the final control variable; the elongation fluctuation range is within a controllable range due to the small fluctuation range, so that the online optimization can be directly realized. K'p＝0.95Kp～1.05Kp；K'i＝0.95Ki～1.05Ki；K′d＝0.95Kd～1.05Kd。
S4, when e (t) is greater than 0.2 in the next production process, recording the maximum value e (t) of elongation deviation in the strip steel leveling process'maxStarting to record the adjustment amount index J'; wherein J' is a specific adjustment index of the current adjustment parameter within 30 seconds, and is calculated by formula (1) of step S1；
S5, if e (t)'maxCorresponding data e (t) stored in the data structure block or moremaxAnd J ' is less than data J stored in the data structure block, then K ' will be present 'p、K'i、K'd、e(t)'maxAnd J' covers the corresponding data in the PLC data structure block; if the above condition is not satisfied, no operation is performed. Therefore, the online automatic setting of the PID control parameters can be realized, the optimal PID parameter conditions of various steel grades are gradually approached, the control model which is more in line with the field equipment conditions is further realized, and the elongation control speed and precision are improved.
Further, in step S2, K is read from the PLC data structure block when the strip head is 50 meters away from the levelerp、Ki、KdAnd (4) information.
The invention has the beneficial effects that: the method of the invention records the current optimal parameters of the PID and the corresponding deviation thereof by adding the storage variable in the PLC system, evaluates the deviation under different input fluctuation conditions through the small-range random fluctuation of the parameters in the production process, updates the stored optimal parameters of the PID according to the evaluation result, realizes the online optimization of the PID parameters, improves the control speed and the precision of the elongation rate and reduces the length of strip steel which is not consistent with the elongation.
Drawings
FIG. 1 is a schematic structural diagram of a hot dip galvanizing four-roll temper mill;
FIG. 2 is a diagram of the execution logic of the present invention;
number designation in the figures: 1-a main body of a leveling machine, 2-a tensioning roller, 3-a crease-resistant roller, 4-an anti-vibration roller and 5-strip steel.
Detailed Description
The elongation control method of a hot dip galvanizing four-roll temper mill according to the present invention will be further described with reference to the following detailed description and the accompanying drawings, but the detailed description and the related descriptions are not intended to unduly limit the technical solution of the present invention. The hot galvanizing four-roller temper mill related by the invention is shown in figure 1; the execution logic diagram of the hot galvanizing four-roller temper mill elongation control method is shown in FIG. 2, and the method comprises the following steps.
(1) Starting;
(2) the control system hardware selects Logix5000 series PLC of AB company, five variables of pid.kp, pid.ki, pid.kd, pid.emax and pid.j are added in the global variable, and the storage information of the five variables is PID model parameter factor Kp、Ki、KdMaximum value of elongation deviation e (t)maxAnd the initial values of the adjustment amount index J are 0.5,0.2,0.0009 and 0.1,10000, respectively.
The adjustment index J is specifically:
the calculation formula of the rolling force adjustment output value p (t) is as follows:
wherein: p (t) is the output value of the rolling force adjustment amount, e (t) is the elongation deviation signal, KpIs a proportionality coefficient, KiIs the integral coefficient, KdIs a differential coefficient. T isiTo integrate the time constant, TDIs the differential time constant.
(3) Accurately tracking the head position of the strip steel by a tracking system of the PLC, reading pid.kp, pid.ki and pid.kd information from a PLC data structure block when the head of the strip steel is 50 meters away from the temper mill, and assigning the information to a temporary variable PID model parameter factor Kp、Ki、Kd。
(4) Parameter factor K for strip steel modelp、Ki、KdRandomly varied, and the varied control variable is K'p、K'i、K'd；K'p＝0.95Kp；K'i＝1.05Ki；K'd＝0.99Kd。
(5) When the elongation deviation signal e (y) is more than 0.2 in the following production process, the maximum value of the elongation deviation begins to be recorded in the strip steel leveling processe(t)'maxAnd starting to record the PID model adjustment quantity index J ', as shown in formula 1, wherein the specific recording time t is 30 seconds, and the specific recording time J' is 500 when the elongation rate deviation signal e (t) is 0.4 in the example.
(6) After the value of J 'is calculated, a judgment logic is executed, as shown in FIG. 2, if the elongation percentage deviation signal e (t)'maxCorresponding data e (t) stored in the data structure block or moremaxAnd J 'is less than the data J stored in the data structure block, in this example e (t)'max>pid.emax，J'<J, satisfies the above condition, thus executing K'p、K'i、K'd、e(t)'maxJ ', J' covers the operation of the corresponding data (pid.kp, pid.ki, pid.kd, pid.emax, pid.j) in the PLC data structure block. If the above condition is not satisfied, no operation is performed.
(7) End up
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes or modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit of the present invention.
Claims (2)
1. A hot galvanizing four-roller temper mill elongation control method is characterized in that: comprises the following steps:
s1, storing the information in the PLC data structure block as PID model parameter factor Kp、Ki、KdAnd maximum value of elongation deviation e (t)maxAn adjustment amount index J;
the formula for calculating the adjustment index J is:
the formula for p (t) is:
wherein the integration time t is after the elongation rate begins to fluctuate for 30 s; p (t) is the output value of the rolling force adjustment amount, e (t) is the elongation deviation signal,
is a first order differential of the elongation deviation signal with respect to time; kpIs a proportionality coefficient, KiIs the integral coefficient, KdIs a differential coefficient; t isiTo integrate the time constant, TdIs a differential time constant;
s2, reading K from the PLC data structure block when the head of the strip steel does not reach the temper millp、Ki、KdInformation;
s3, a model parameter factor Kp、Ki、KdRandomly changing the parameters within the range of +/-5% of the original parameters; and the model parameter factor K 'after random variation'p、K′i、K′dAs the final control variable;
s4, when e (t) is greater than 0.2 in the next production process, recording the maximum value e (t) of elongation deviation in the strip steel leveling process'maxStarting to record the adjustment amount index J'; wherein J' is a specific adjustment quantity index of the current adjustment parameter within 30 seconds, and is calculated by formula (1) of step S1;
s5, if e (t)'maxCorresponding data e (t) stored in the data structure block or moremaxAnd J ' is less than data J stored in the data structure block, then K ' will be present 'p、K′i、K′d、e(t)′maxAnd J' covers the corresponding data in the PLC data structure block; if the above condition is not satisfied, no operation is performed.
2. The elongation control method for a hot dip galvanizing four-roll temper mill according to claim 1, characterized by comprising the following steps: the step S2 is to read K from the PLC data structure block when the strip head is 50 m away from the levelerp、Ki、KdAnd (4) information.
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Citations (5)
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|---|---|---|---|---|
| US4481799A (en) * | 1981-03-13 | 1984-11-13 | Escher Wyss Aktiengesellschaft | Arrangement for regulating a rolling mill for metal rolling |
| JP2013066934A (en) * | 2011-09-06 | 2013-04-18 | Nippon Steel & Sumitomo Metal Corp | Metal plate rolling device and metal plate rolling method |
| CN104107837A (en) * | 2013-04-19 | 2014-10-22 | 宝山钢铁股份有限公司 | Method for accurately controlling band-steel ductility when welding joints pass leveling machine |
| CN105251780A (en) * | 2015-11-11 | 2016-01-20 | 首钢总公司 | Control method for ductility fluctuation of temper mill |
| CN110227723A (en) * | 2019-06-09 | 2019-09-13 | 宝钢湛江钢铁有限公司 | A kind of parameter control method of six roller Cold-Rolled Strip Temper Mill initial segment of continuous annealing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4481799A (en) * | 1981-03-13 | 1984-11-13 | Escher Wyss Aktiengesellschaft | Arrangement for regulating a rolling mill for metal rolling |
| JP2013066934A (en) * | 2011-09-06 | 2013-04-18 | Nippon Steel & Sumitomo Metal Corp | Metal plate rolling device and metal plate rolling method |
| CN104107837A (en) * | 2013-04-19 | 2014-10-22 | 宝山钢铁股份有限公司 | Method for accurately controlling band-steel ductility when welding joints pass leveling machine |
| CN105251780A (en) * | 2015-11-11 | 2016-01-20 | 首钢总公司 | Control method for ductility fluctuation of temper mill |
| CN110227723A (en) * | 2019-06-09 | 2019-09-13 | 宝钢湛江钢铁有限公司 | A kind of parameter control method of six roller Cold-Rolled Strip Temper Mill initial segment of continuous annealing |
Non-Patent Citations (1)
| Title |
|---|
| PLC在平整拉矫机控制系统上的应用;魏向新;《天津科技》;20200131;第47卷(第1期);第52-54页 * |
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