CN114054708A - Roll gap control method and device - Google Patents
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Abstract
The invention discloses a roll gap control method and a roll gap control device, which are applied to roll gap control of a continuous casting machine, and the method comprises the following steps: acquiring a measured roll gap value and an on-line roll gap value of a pair roll of a continuous casting machine, wherein the measured roll gap value is obtained by measuring a sensor of the continuous casting machine, and the on-line roll gap value is obtained by measuring equipment outside the sensor of the continuous casting machine; obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value; obtaining a first roll gap difference value according to the comprehensive roll gap value and a target roll gap value required by the process; and adjusting the roll gap of the continuous casting machine to the roll according to the first roll gap difference value. The control method can accurately adjust the roll gap of the pair roller of the continuous casting machine, can improve the accuracy and stability of control, reduces the defects of slab center segregation, looseness, angle cracks and the like, and further improves the slab rolling quality.
Description
Technical Field
The invention relates to the technical field of control of continuous casting machines, in particular to a roll gap control method and device.
Background
With the continuous upgrading of the manufacturing industry, the work of detecting, correcting, maintaining and the like of high-end equipment also becomes a significant issue to be solved in the industry. The excellent and high-level casting machine roll gap measuring device not only can improve the detection precision of the roll system position of the continuous casting machine, but also indirectly represents the level of manufacturing measuring equipment, so that the research and application of the casting machine roll gap measuring device are taken as important scientific research subjects by the current research institutions and enterprises and institutions. In the current steel market, the national steel enterprises should impact the high-end products of the steel enterprises by utilizing the advantages of talents, resources and equipment. The high-end product puts higher requirements on the quality of steel, and the equipment precision is the basic guarantee for producing the high-end product.
The use of hydraulic sectors is becoming more and more common with the application of techniques such as soft and large reduction in continuous casting machines. The roll gap control process is an important process in slab production, and the roll gap precision control is the basis and guarantee of the roll gap control process. Improper control of the continuous casting roll gap can lead to problems such as: the state of the casting machine is deteriorated, the maintenance rate of the continuous casting fan-shaped section is increased, the deformation resistance of a casting blank is large, the loads of a casting roller and a bearing seat are large, and the service lives of the casting roller and the bearing are reduced; meanwhile, the quality of the plate blank is reduced, and quality problems such as center segregation, center cracks, corner transverse cracks and the like are easily caused. At present, roll gap control of a continuous casting machine to a roll is based on sensor feedback signals of the continuous casting machine to the roll. Due to the influence of production environment, the stability of roll gap data fed back by the sensor in the control process is poor, so that the roll gap is unreasonably controlled, and the rolling quality of the plate blank is influenced.
In summary, how to improve the roll gap control accuracy of the continuous casting machine is a technical problem to be solved urgently at the present stage.
Disclosure of Invention
The roll gap control method and the roll gap control device are used for improving the roll gap control precision of a continuous casting machine.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a roll gap control method, which is applied to roll gap control of a continuous casting machine, and the method includes:
acquiring a measured roll gap value and an on-line roll gap value of a pair roll of a continuous casting machine, wherein the measured roll gap value is obtained by measuring a sensor of the continuous casting machine, and the on-line roll gap value is obtained by measuring equipment outside the sensor of the continuous casting machine;
obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value;
obtaining a first roll gap difference value according to the comprehensive roll gap value and a target roll gap value required by the process;
and adjusting the roll gap of the continuous casting machine to the roll according to the first roll gap difference value.
In an alternative embodiment, the obtaining of the measured roll gap value and the on-line roll gap value of the continuous casting machine to the roll comprises:
acquiring the measured roll gap value of the continuous casting machine at the end part position of the pair of rolls fed back by a sensor;
and acquiring the online roll gap value measured by the roll gap instrument on the middle position of the pair roller of the continuous casting machine.
In an alternative embodiment, the middle position is a position interval which is less than 69mm away from the midpoint of the pair of rollers of the continuous casting machine.
In an optional embodiment, the obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value includes:
according to the formula
Obtaining a comprehensive roll gap value;
wherein ,
is the integrated roll gap value, and alphan is the measured roll gap value
Beta n is the online roll gap value
α n + β n is 1.
In an optional embodiment, before obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value, the method further includes:
acquiring the online weight coefficient and the measurement weight coefficient of the current rolling period according to the historical measurement roll gap value and the historical online roll gap value of the historical rolling period; the historical rolling period is the previous period of the current rolling period.
In an optional embodiment, the value range of the online weight coefficient is 0.5-0.7; the value range of the measurement weight coefficient is 0.3-0.5.
In an optional embodiment, the obtaining the online weighting coefficient and the measurement weighting coefficient for the current rolling cycle according to the historical measured roll gap value and the historical online roll gap value of the historical rolling cycle includes:
dividing the value range of the online weight coefficient to obtain a plurality of first weight coefficient blocks; dividing the value range of the measurement weight coefficient to obtain a plurality of second weight coefficient blocks;
determining a target online weight coefficient in each first weight coefficient block; determining a target measurement weight coefficient in each second weight coefficient block;
inputting the measured roll gap value, the online roll gap value, the target online weight coefficient and the target measured weight coefficient into a mixing test model to obtain a plurality of second roll gap difference values;
determining a first target weight coefficient group and a second target weight coefficient group according to the deviation of each second roll gap difference value and the target roll gap value;
and obtaining the online weight coefficient and the measurement weight coefficient of the current rolling period according to the first target weight coefficient group and the second target weight coefficient group.
In an alternative embodiment, the determining a first target weight coefficient group and a second target weight coefficient group according to the deviation of each of the second roll gap difference values from the target roll gap value includes:
judging whether the deviation between the second roll gap difference value and the target roll gap value is located in a coefficient optimization interval or not according to each second roll gap difference value;
if so, determining a first weight coefficient zone group and a second weight coefficient zone group corresponding to the current second roll gap difference value as a first target weight coefficient zone group and a second target weight coefficient zone group;
and if not, discarding the first weight coefficient block and the second weight coefficient block corresponding to the current second roll gap difference value.
In an alternative embodiment, the first target weight coefficient zone is 0.52-0.58; the second target weight coefficient zone set is 0.42-0.48.
In a second aspect, an embodiment of the present invention further provides a roll gap control apparatus, which is applied to roll gap control of a continuous casting machine, and the apparatus includes:
the acquisition module is used for acquiring a measured roll gap value and an online roll gap value of a pair roll of the continuous casting machine, wherein the measured roll gap value is obtained by measuring a sensor of the continuous casting machine, and the online roll gap value is obtained by measuring equipment outside the sensor of the continuous casting machine;
the first obtaining module is used for obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value;
the second obtaining module is used for obtaining a first roll gap difference value according to the comprehensive roll gap value and a target roll gap value of the process requirement;
and the adjusting module is used for adjusting the roll gap of the continuous casting machine to the roll according to the first roll gap difference value.
Compared with the prior art, the roll gap control method and the roll gap control device provided by the embodiment of the invention have the following advantages:
according to the roll gap control method provided by the embodiment of the invention, the comprehensive roll gap value is obtained by obtaining the measured roll gap value and the online roll gap value of the pair roll of the continuous casting machine and according to the measured roll gap value and the online roll gap value, so that the roll gap of the pair roll of the continuous casting machine is accurately adjusted, the accuracy and the stability of control can be improved, the generation of defects such as slab center segregation, looseness, angle cracks and the like is reduced, and the slab rolling quality is further improved. Meanwhile, the improvement of the roll gap control precision reduces the maintenance rate of continuous casting machine equipment, particularly the maintenance rate of a sector section, and brings remarkable economic and social benefits.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a continuous casting machine according to an embodiment of the present invention;
FIG. 2 is a flow chart of a roll gap control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a transverse arrangement position of a roll gap gauge provided by an embodiment of the invention;
FIG. 4 is a graph of online weighting factors and measured weighting factors provided by an embodiment of the present invention;
FIG. 5 is a comparison graph of accuracy before and after optimization of the on-line weighting coefficients and the measurement weighting coefficients provided by the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a roll gap control device according to an embodiment of the present invention.
Description of reference numerals:
1-sensor, 2-hydraulic cylinder, 3-servo valve, 4-upper frame, 5-lower frame, 6-roll gap instrument, 7-dummy bar, 8-upper continuous casting roll, 9-lower continuous casting roll and 10-continuous casting machine pair roll.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an exemplary continuous casting machine according to an embodiment of the present invention. The pair roller 10 of the continuous casting machine comprises an upper continuous casting roller 8 and a lower continuous casting roller 9, the sensor 1 is arranged at the end position of the upper continuous casting roller 8 along the length direction, the position change of the upper continuous casting roller 8 in the vertical direction is measured in real time, and the value of the position change is converted into a measured roll gap value. Among them, the number of the sensors 1 may be one or two. In order to ensure the measurement accuracy, two sensors 1 can be arranged at the two end parts of the pair roller 10 of the continuous casting machine, and the measured roll gap value is obtained by converting the average value of the measured values of the two sensors 1. Of course, the set positions of the sensors 1 can also be set according to the segment positions of the continuous casting machine, two sensors 1 are set for each segment position, and the continuous casting machine is generally set with a plurality of segment positions according to the continuous casting process, such as: a vertical section, a sector section and a horizontal section. Each section comprises a plurality of continuous casting machine roll pairs 10, an upper frame 4 and a lower frame 5 are respectively arranged above and below the plurality of continuous casting machine roll pairs 10, two hydraulic cylinders 2 are mounted at the tops of the upper frames 4, and the size of a roll gap between an upper continuous casting roll 8 and a lower continuous casting roll 9 is controlled through the telescopic action of the two hydraulic cylinders 2. The hydraulic cylinder 2 is connected to a servo valve 3, and the telescopic operation of the hydraulic cylinder 2 is controlled by the servo valve 3. The following embodiment of the present invention will specifically explain how to control the roll gap of the roll 10 of the continuous casting machine.
Referring to fig. 2, fig. 2 is a flowchart of a roll gap control method applied to roll gap control of a continuous casting machine according to an embodiment of the present invention, where the method includes:
and 11, acquiring a measured roll gap value and an online roll gap value of a pair roll of the continuous casting machine, wherein the measured roll gap value is obtained by measuring a sensor of the continuous casting machine, and the online roll gap value is obtained by measuring equipment outside the sensor of the continuous casting machine.
It will be appreciated by those skilled in the art that a measuring device other than the sensor 1 measures the on-line roll gap value and that the roll gap gauge 6 may be mounted on the dummy bar 7. Specifically, the dummy bar 7 comprises two parallel dummy bar chains, a connecting piece is arranged between the two dummy bar chains, and the roll gap instrument 6 is fixedly arranged on the connecting piece. When a continuous casting blank works, the process that the dummy bar chain drives the roll gap instrument 6 to move measures the roll gap of the continuous casting machine in real time, and the roll gap of the continuous casting machine to the roll 10 can be detected in time so as to obtain an online roll gap value.
In an alternative embodiment, obtaining measured and in-line roll gap values for a continuous caster roll 10 comprises:
acquiring a measured roll gap value of the continuous casting machine at the end position of the pair of rolls 10 fed back by the sensor 1;
and acquiring an online roll gap value measured by the roll gap meter 6 on the middle position of the pair roller 10 of the continuous casting machine.
Because the installation mode of conticaster pair roller 10 is that both ends are installed on corresponding axle bed, in the in-process of carrying out the continuous casting blank, all can cause the measurement roll gap value data that sensor 1 obtained unusual or inaccurate for following reason:
1. sensor anomalies or cumulative errors.
2. The bearings in the shaft seats are damaged.
3. Abrasion of the roller surface by the continuous casting machine; because of adopting the soft reduction technology, the withdrawal force is relatively increased, and the roller abrasion of the continuous casting machine of the sector section is increased.
4. A variant of the frame structure, the frame structure comprising an upper frame and a lower frame; when the slab stagnation accident occurs, if a casting slab is pulled out of the sector section in a redraw mode, the sector section frame may deform, and the gap between each hinge point becomes large.
5. In the off-line maintenance process of the fan-shaped section, the processing concentricity precision of the roller sleeve of the pair roller of the continuous casting machine is insufficient, the pair roller of the continuous casting machine is not installed in place, and the gap between the rollers is increased.
6. The fan-shaped section has the characteristics of high temperature and high humidity in an online working environment, after the fan-shaped section is used for a period of time, the roll surface of the fan-shaped section can be subjected to slag and scale deposition, the connecting plate and the rack can also deform, and the adverse effect on the roll gap can be generated.
7. And the installation error between the shaft seat and the bearing.
8. Slag deposits are arranged between the shaft seats and the distance blocks, and the distance blocks are arranged between the adjacent shaft seats.
9. The caster breaks at the rolls.
Therefore, the accuracy of the measured roll gap value of the continuous casting machine at the end position of the pair roller is not enough only by adopting the sensor, and the roll gap value of the continuous casting machine at the middle position of the pair roller has great significance for the overall control of the roll gap. The middle position of the pair roller of the continuous casting machine is measured through the roller gap instrument, so that the accuracy of roller gap measurement is improved, and errors caused by the reasons in the roller gap control process are avoided.
In an alternative embodiment, the intermediate position is a position interval less than 69mm from the midpoint of the continuous caster counter roll 10.
Because the axial of the continuous casting machine paired roller 10 is divided into three rollers, the three rollers are connected through a sectional bearing, and the sectional lengths of the continuous casting machine paired roller 10 are arranged in a vertically, horizontally and longitudinally staggered manner. Referring to fig. 3, fig. 3 is a schematic diagram of a transverse arrangement position of a roll gap gauge 6 according to an embodiment of the present invention, a pair roll 10 of a continuous casting machine is mainly composed of three types of rolls 1-9 in fig. 3, a measurement width direction coincidence distance L1 is 178mm, and it is generally within 20mm to ensure that a measurement ball head of the online roll gap gauge 6 is within a range of L1 in consideration of a deviation situation of a dummy bar 7 in actual operation. Therefore, the transverse installation position of the roll gap gauge 6 ensures that the measuring ball head is within the range of L2.
L2＝L1-20×2＝138mm
Therefore, the middle position is set to be a position interval from the middle point of the pair roller 10 of the continuous casting machine to the axial direction of the two ends, the position interval is a distance range from the middle point to the two ends, the distance range is smaller than 69mm, the middle position of a measuring ball head of the roll gap instrument 6 can be measured in the range, and the accuracy of roll gap measurement can be further improved. After the measured roll gap value and the on-line roll gap value are accurately obtained by the method, the step 12 is carried out.
And step 12, obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value.
The continuous casting machine pair roller 10 can generate radial deformation due to load in the using process, so that errors exist in the measurement of the roll gap value obtained by measuring the middle position of the continuous casting machine pair roller 10, and the measurement of the measured roll gap value and the on-line roll gap value is limited. Therefore, the accuracy of the roll gap control is better when the comprehensive roll gap value is obtained by measuring the roll gap value and the online roll gap value.
In an alternative embodiment, obtaining a composite roll gap value based on the measured roll gap value and the on-line roll gap value comprises:
according to the formula
Obtaining a comprehensive roll gap value;
wherein ,
for comprehensive roll gap values, alphan for measured roll gap values
On-line weight coefficient of betanIs an on-line roll gap value
Measured weight coefficient of (a)n+βn＝1。
It can be understood that the measured roll gap value and the on-line roll gap value are subjected to refined weighting analysis to obtain a comprehensive roll gap value, and the weight between the measured roll gap value and the on-line roll gap value can be balanced. The higher the measurement precision is, the larger the corresponding value of the weight coefficient is, so as to improve the reliability of the comprehensive roll gap value.
In an alternative embodiment, before obtaining the integrated roll gap value according to the measured roll gap value and the on-line roll gap value, the method further includes:
acquiring an online weight coefficient and a measurement weight coefficient of a current rolling period according to a historical measurement roll gap value and a historical online roll gap value of a historical rolling period; the historical rolling period is the previous period of the current rolling period.
Wherein, the historical measured roll gap value and the historical online roll gap value are the measured values of the sensor 1 and the roll gap instrument 6 in the previous period; the on-line weight coefficient and the measurement weight coefficient of the current rolling cycle are the current measurement values of the sensor 1 and the roll gap meter 6.
Because the deformation degree of the continuous casting machine to the roller 10 changes along with the rolling period in the continuous production process of the continuous casting machine, and the stress states of the rolling periods are different, the deformation degree is difficult to predict. If the fixed online weight coefficient and the measurement weight coefficient are adopted to obtain the comprehensive roll gap value, the obtained result is inaccurate. Therefore, the on-line weight coefficient and the measurement weight coefficient are updated and corrected along with the change of the rolling period, the updating and correction reflect the instant state of the roll gap of the continuous casting machine to the roller 10, and the value precision of the on-line weight coefficient and the measurement weight coefficient can be improved.
In an optional embodiment, the value range of the online weight coefficient is 0.5-0.7; the value range of the measurement weight coefficient is 0.3-0.5.
It should be noted that the value range is determined through a large number of tests based on the method of the embodiment of the present invention, and the reliability of the comprehensive roll gap value obtained through calculation in the value range is good. The determination values of the on-line weight coefficient and the measurement weight coefficient in the value range can be determined according to the difference between the obtained comprehensive roll gap value and the target roll gap value, and if the obtained comprehensive roll gap value is close to the target roll gap value, the values of the on-line weight coefficient and the measurement weight coefficient can be determined to meet the requirements.
In order to further improve the reliability of the comprehensive roll gap value, the value ranges of the online weight coefficient and the measurement weight coefficient are further optimized.
In an alternative embodiment, the obtaining the online weighting coefficient and the measurement weighting coefficient of the current rolling cycle according to the historical measured roll gap value and the historical online roll gap value of the historical rolling cycle comprises:
dividing the value range of the online weight coefficient to obtain a plurality of first weight coefficient zone groups; dividing the value range of the measurement weight coefficient to obtain a plurality of second weight coefficient blocks;
determining a target online weight coefficient in each first weight coefficient block; determining a target measurement weight coefficient in each second weight coefficient block;
inputting the measured roll gap value, the online roll gap value, the target online weight coefficient and the target measured weight coefficient into a mixing test model to obtain a plurality of second roll gap difference values;
determining a first target weight coefficient group and a second target weight coefficient group according to the deviation of each second roll gap difference value and the target roll gap value;
and obtaining the on-line weight coefficient and the measurement weight coefficient of the current rolling period according to the first target weight coefficient group and the second target weight coefficient group.
The value ranges of the online weight coefficients and the measurement weight coefficients are divided, and the division can be carried out according to the upper limit interval value, the middle interval value and the lower limit interval value of the value ranges. Certainly, the division can be further refined, the smaller the interval value of the divided area group is, the smaller the range of the correspondingly determined first target weight coefficient zone group and second target weight coefficient zone group is, and the more accurate the finally obtained on-line weight coefficient and measurement weight coefficient of the current rolling cycle are; conversely, the larger the size.
It can be understood that the value ranges of the online weight coefficient and the measurement weight coefficient are divided, then the target online weight coefficient and the target measurement weight coefficient are determined, and the second roll gap difference value corresponding to the divided groups can be obtained so as to analyze and judge the optimal first weight coefficient group and the optimal second weight coefficient group. The optimization mode has small calculation amount, and the first target weight coefficient block and the second target weight coefficient block which are optimized are accurately determined.
In an alternative embodiment, determining the first target weight coefficient group and the second target weight coefficient group according to the deviation of each second roll gap difference value from the target roll gap value includes:
judging whether the deviation between the second roll gap difference value and the target roll gap value is located in the coefficient optimization interval or not according to each second roll gap difference value;
if so, determining a first weight coefficient zone group and a second weight coefficient zone group corresponding to the current second roll gap difference value as a first target weight coefficient zone group and a second target weight coefficient zone group;
and if not, discarding the first weight coefficient block and the second weight coefficient block corresponding to the current second roll gap difference value.
The coefficient optimization interval can be flexibly selected based on experience or actual conditions of technicians, and certainly, the calibration test can be performed on the second roll gap difference value, so that an accurate coefficient optimization interval is obtained.
The embodiment of the invention further explains the optimization process of the on-line weight coefficient and the measurement weight coefficient through a material mixing test model. Determining a standard sequence and an operation sequence of the mixing test model based on the mixing test model; the number of packets is defined as one group, but it may be multiple groups, and the number of packets in a group is marked as 1. The value ranges of the online weight coefficient and the measurement weight coefficient are divided into three groups which are respectively marked as three point types 1, 0 and-1, wherein the point type 1 is the extreme value of the value ranges of the online weight coefficient and the measurement weight coefficient, the point type 0 is the middle value of the value ranges, and the point type-1 is the value between the extreme value and the middle value of the value ranges. And correspondingly taking values of the value ranges of the on-line weight coefficient and the measurement weight coefficient, inputting the values into a mixing test model, and obtaining a second roll gap difference value by using a response optimizer, as shown in table 1.
Table 1:
and determining a first target weight coefficient group and a second target weight coefficient group according to the deviation of each second roll gap difference value and the target roll gap value. As shown in fig. 4, fig. 4 is a graph of online weight coefficients and measured weight coefficients provided by the embodiment of the present invention, in which when a first target weight coefficient block is 0.52-0.58, a second roll gap difference value is close to 0.1 mm; when the second target weight coefficient zone set is 0.42-0.48, the difference value of the second roll gap is close to 0.1 mm.
To further verify whether the first target weight coefficient group and the second target weight coefficient group meet the requirements. And determining an online weight coefficient and a measurement weight coefficient according to the first target weight coefficient block and the second target weight coefficient block, and further obtaining a comprehensive roll gap value.
And step 13, obtaining a first roll gap difference value according to the comprehensive roll gap value and a target roll gap value required by the process.
In particular, according to the formula
Obtaining a first roll gap difference value;
wherein ,
the target roll gap value is set as the target roll gap value,
is the first roll gap difference.
Referring to fig. 5, fig. 5 is a graph illustrating the accuracy comparison before and after the optimization of the on-line weight coefficient and the measurement weight coefficient according to the embodiment of the present invention. According to the value range of the on-line weight coefficient and the measurement weight coefficient before optimization, the obtained first roll gap difference value is 0.2-0.5 mm; and determining an online weight coefficient and a measurement weight coefficient by adopting the first target weight coefficient block and the second target weight coefficient block, wherein the obtained first roll gap difference value is 0.1-0.2 mm, and the average value and the distribution interval of the first roll gap difference value are both obviously reduced. Therefore, the accuracy of the value ranges of the optimized on-line weight coefficient and the optimized measurement weight coefficient is higher, and the accuracy of the obtained first roll gap difference value is better.
And step 14, adjusting the roll gap of the continuous casting machine to the roll 10 according to the first roll gap difference value.
The roll gap can be controlled and adjusted by driving the hydraulic cylinder 2 based on the servo valve 3, each section of the continuous casting machine is provided with two groups of servo valves 3 and hydraulic cylinders 2, and the two groups of servo valves 3 and hydraulic cylinders 2 control the upper frame 4 to ascend or descend in a balanced manner, so that the roll gap of the continuous casting machine to the roll 10 is adjusted.
The technical scheme provided by the embodiment of the invention at least has the following advantages:
1. the method comprises the steps of obtaining a measured roll gap value and an online roll gap value of a pair roll of the continuous casting machine, obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value, accurately adjusting the roll gap of the pair roll of the continuous casting machine, improving the accuracy and stability of control, reducing the defects of slab center segregation, looseness, angle cracks and the like, and further improving the slab rolling quality.
2. Utilize sensor and roll gap appearance, real-time supervision continuous casting roll gap state promotes the roll gap and detects the accuracy, and accurate quantization roll gap value and feedback control carry out the weighting analysis that becomes more meticulous, with the pneumatic cylinder and the servo valve dynamic control of sectorial section in coordination, and the weighting coefficient is constantly optimized according to the measured result, has further promoted roll gap control accuracy.
3. The invention provides guarantee for the stability and accuracy of roll gap control, the roll gap management is more convenient and practical, the maintenance rate of the sector section is reduced, the continuous casting production efficiency is improved, the quality of the continuous casting slab is improved, and the high-quality development of enterprises is promoted.
Based on the same inventive concept as the roll gap control method, another embodiment of the present invention further provides a roll gap control apparatus, which is applied to roll gap control of a continuous casting machine, please refer to fig. 6, where fig. 6 is a schematic structural diagram of the roll gap control apparatus provided by the embodiment of the present invention, and the apparatus includes:
the acquisition module is used for acquiring a measured roll gap value and an online roll gap value of a pair roll of the continuous casting machine, wherein the measured roll gap value is obtained by measuring a sensor of the continuous casting machine, and the online roll gap value is obtained by measuring equipment outside the sensor of the continuous casting machine;
the first obtaining module is used for obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value;
the second obtaining module is used for obtaining a first roll gap difference value according to the comprehensive roll gap value and a target roll gap value of the process requirement;
and the adjusting module is used for adjusting the roll gap of the continuous casting machine to the roll 10 according to the first roll gap difference value.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A roll gap control method applied to roll gap control of a continuous casting machine, the method comprising:
acquiring a measured roll gap value and an on-line roll gap value of a pair roll of a continuous casting machine, wherein the measured roll gap value is obtained by measuring a sensor of the continuous casting machine, and the on-line roll gap value is obtained by measuring equipment outside the sensor of the continuous casting machine;
obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value;
obtaining a first roll gap difference value according to the comprehensive roll gap value and a target roll gap value required by the process;
and adjusting the roll gap of the continuous casting machine to the roll according to the first roll gap difference value.
2. The roll gap control method according to claim 1, wherein the obtaining of the measured roll gap value and the on-line roll gap value of the continuous casting machine to the roll comprises:
acquiring the measured roll gap value of the continuous casting machine at the end part position of the pair of rolls fed back by a sensor;
and acquiring the online roll gap value measured by the roll gap instrument on the middle position of the pair roller of the continuous casting machine.
3. The roll gap control method according to claim 2, wherein the middle position is a position interval having a distance of less than 69mm from a middle point of the pair of rolls of the continuous casting machine.
4. A roll gap control method according to claim 1 or 2, wherein said obtaining a composite roll gap value from said measured roll gap value and said on-line roll gap value comprises:
according to the formula
Obtaining a comprehensive roll gap value;
wherein ,
is the integrated roll gap value, and alphan is the measured roll gap value
On-line weight coefficient of betanFor said on-line roll gap value
Measured weight coefficient of (a)n+βn＝1。
5. The roll gap control method according to claim 4, wherein before obtaining a composite roll gap value from the measured roll gap value and the on-line roll gap value, further comprising:
acquiring the online weight coefficient and the measurement weight coefficient of the current rolling period according to the historical measurement roll gap value and the historical online roll gap value of the historical rolling period; the historical rolling period is the previous period of the current rolling period.
6. The roll gap control method according to claim 4, wherein the value range of the online weight coefficient is 0.5-0.7; the value range of the measurement weight coefficient is 0.3-0.5.
7. The roll gap control method according to claim 5, wherein the obtaining the online weight coefficient and the measurement weight coefficient of the current rolling cycle according to the historical measurement roll gap value and the historical online roll gap value of the historical rolling cycle comprises:
dividing the value range of the online weight coefficient to obtain a plurality of first weight coefficient blocks; dividing the value range of the measurement weight coefficient to obtain a plurality of second weight coefficient blocks;
determining a target online weight coefficient in each first weight coefficient block; determining a target measurement weight coefficient in each second weight coefficient block;
inputting the measured roll gap value, the online roll gap value, the target online weight coefficient and the target measured weight coefficient into a mixing test model to obtain a plurality of second roll gap difference values;
determining a first target weight coefficient group and a second target weight coefficient group according to the deviation of each second roll gap difference value and the target roll gap value;
and obtaining the online weight coefficient and the measurement weight coefficient of the current rolling period according to the first target weight coefficient group and the second target weight coefficient group.
8. The roll gap control method of claim 7, wherein determining a first target weighting factor group and a second target weighting factor group based on a deviation of each of the second roll gap differences from the target roll gap value comprises:
judging whether the deviation between the second roll gap difference value and the target roll gap value is located in a coefficient optimization interval or not according to each second roll gap difference value;
if so, determining a first weight coefficient zone group and a second weight coefficient zone group corresponding to the current second roll gap difference value as a first target weight coefficient zone group and a second target weight coefficient zone group;
and if not, discarding the first weight coefficient block and the second weight coefficient block corresponding to the current second roll gap difference value.
9. A roll gap control method according to claim 8,
the first target weight coefficient zone set is 0.52-0.58;
the second target weight coefficient zone set is 0.42-0.48.
10. A roll gap control apparatus applied to roll gap control of a continuous casting machine, the apparatus comprising:
the acquisition module is used for acquiring a measured roll gap value and an online roll gap value of a pair roll of the continuous casting machine, wherein the measured roll gap value is obtained by measuring a sensor of the continuous casting machine, and the online roll gap value is obtained by measuring equipment outside the sensor of the continuous casting machine;
the first obtaining module is used for obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value;
the second obtaining module is used for obtaining a first roll gap difference value according to the comprehensive roll gap value and a target roll gap value of the process requirement;
and the adjusting module is used for adjusting the roll gap of the continuous casting machine to the roll according to the first roll gap difference value.
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