CN114054708B - 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, wherein the method comprises the following steps: obtaining a measured roll gap value of a pair of rolls of a continuous casting machine and an online roll gap value, 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; 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 the target roll gap value required by the process; and adjusting the roll gap of the continuous casting machine pair roll according to the first roll gap difference value. The control method can accurately adjust the roll gap of the counter roll of the continuous casting machine, can improve the control accuracy and stability, 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 continuous casting machine control, in particular to a roll gap control method and device.
Background
With the continuous upgrading and upgrading of the manufacturing industry, the detection, correction, maintenance and other tasks of high-end equipment also become important issues in the industry. The excellent high-level casting machine roll gap measuring device not only can improve the detection precision of the continuous casting machine roll system position, but also indirectly represents the level of manufacturing measuring equipment, so that the research and application of the casting machine roll gap measuring device is used as a major scientific research subject by the current research institutions and enterprises and institutions. In the current steel market, domestic steel enterprises should utilize the advantages of personal talents, resources and equipment to impact the high-end products of the steel enterprises. The high-end product has 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 segments is becoming more common with the application of technologies such as light and heavy depressions of continuous casting machines. The roll gap control process is an important process in slab production, and roll gap precision control is a 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 poor, the maintenance rate of the continuous casting sector section is increased, the deformation resistance of casting blanks is large, the loads of the casting rolls and the bearing seats are large, and the service lives of the casting rolls and the bearings are shortened; meanwhile, the quality of the slab is reduced, and the quality problems of center segregation, center crack, angle transverse crack and the like are easily caused. At present, the roll gap control of the twin rolls of the continuous casting machine is based on the feedback signals of the sensors of the twin rolls of the continuous casting machine. Due to the influence of production environment, the stability of the roll gap data fed back by the sensor in the control process is poor, so that the roll gap control is unreasonable, and the rolling quality of the slab is affected.
In summary, how to improve the roll gap control accuracy of the continuous casting machine is a technical problem to be solved in 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 the 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:
obtaining a measured roll gap value of a pair of rolls of a continuous casting machine and an online roll gap value, 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;
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 the target roll gap value required by the process;
and adjusting the roll gap of the continuous casting machine pair roll according to the first roll gap difference value.
In an alternative embodiment, the obtaining the measured roll gap value and the online roll gap value of the continuous caster pair roll includes:
acquiring the measured roll gap value of the end position of the twin roll of the continuous casting machine fed back by a sensor;
and acquiring the online roll gap value measured by a roll gap instrument on the middle position of the twin roll of the continuous casting machine.
In an alternative embodiment, the mid-position is a position interval that is less than 69mm from the caster roll-to-roll midpoint.
In an alternative embodiment, the obtaining the integrated 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 ,
in order to integrate the roll gap value,alpha n is the measuring roll gap value +.>
Is the online weight coefficient of the online roll gap value +.>
αn+βn=1.
In an alternative embodiment, before the obtaining the integrated roll gap value according to the measured roll gap value and the online roll gap value, the method further includes:
according to the historical measurement roll gap value and the historical online roll gap value of the historical rolling period, acquiring the online weight coefficient and the measurement weight coefficient of the current rolling period; the historical rolling period is the period which is the last period of the current rolling period.
In an alternative 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 alternative embodiment, the obtaining the online weight coefficient and the measured weight 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 includes:
dividing the value range of the online weight coefficient to obtain a plurality of first weight coefficient groups; dividing the value range of the measurement weight coefficient to obtain a plurality of second weight coefficient groups;
determining a target online weight coefficient in each first weight coefficient group; determining a target measurement weight coefficient in each second weight coefficient group;
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 differences;
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 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 in a coefficient optimization interval or not according to each second roll gap difference value;
if yes, determining a first weight coefficient group and a second weight coefficient group corresponding to the current second roll gap difference value as a first target weight coefficient group and a second target weight coefficient group;
if not, discarding the first weight coefficient group and the second weight coefficient group corresponding to the current second roll gap difference value.
In an alternative embodiment, the first target weight coefficient group is 0.52-0.58; the second target weight coefficient group is 0.42-0.48.
In a second aspect, an embodiment of the present invention further provides a roll gap control device, which is applied to roll gap control of a continuous casting machine, and the device includes:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a measured roll gap value of a pair of rollers of a continuous casting machine and an online roll gap value, 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 the target roll gap value required by the process;
and the adjusting module is used for adjusting the roll gap of the twin rolls of the continuous casting machine 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 counter roll of the continuous casting machine, so that the roll gap of the counter roll of the continuous casting machine is accurately adjusted, the control accuracy and stability can be improved, the defects of slab center segregation, looseness, angle cracks and the like are reduced, and the rolling quality of the slab is further improved. Meanwhile, the improvement of the roll gap control precision reduces the maintenance rate of continuous casting equipment, particularly the maintenance rate of sector sections, and brings remarkable economic and social benefits.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
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 view of a transverse setting position of a roll gap gauge according to an embodiment of the present invention;
FIG. 4 is a graph of on-line weight coefficients and measured weight coefficients provided by an embodiment of the present invention;
FIG. 5 is a graph showing the comparison of the accuracy of the on-line weight coefficient and the measured weight coefficient before and after optimization according to 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.
Reference numerals illustrate:
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, 10-continuous casting machine twin roll.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within 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 twin rolls 10 of the continuous casting machine comprise an upper casting roll 8 and a lower casting roll 9, the sensor 1 is arranged at the end position of the upper casting roll 8 along the length direction, the position change of the upper casting roll 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. Wherein the number of sensors 1 may be one or two. To ensure the measurement accuracy, two sensors 1 may be disposed at two end positions of the twin roll 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 setting positions of the sensors 1 may also be set according to the segments of the continuous casting machine, two sensors 1 are set for each segment, and the continuous casting machine typically sets a plurality of segments according to the continuous casting process, for example: vertical, fan-shaped, and horizontal segments. Each segment comprises a plurality of continuous casting machine twin rolls 10, an upper frame 4 and a lower frame 5 are respectively arranged above and below the plurality of continuous casting machine twin rolls 10, two hydraulic cylinders 2 are arranged at the top of the upper frame 4, and the size of a roll gap between the upper continuous casting roll 8 and the 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 expansion and contraction operation of the hydraulic cylinder 2 is controlled by the servo valve 3. The following examples of the present invention will specifically illustrate how the gap between the pair of rolls 10 of the continuous casting machine can be controlled.
Referring to fig. 2, fig. 2 is a flowchart of a roll gap control method for a continuous casting machine according to an embodiment of the invention, where the method includes:
and 11, acquiring a measured roll gap value of the twin rolls of the continuous casting machine and an online roll gap value, 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 may be used to obtain an on-line roll gap value by measuring, and the roll gap gauge 6 may be mounted on the dummy bar 7. Specifically, the dummy bar 7 includes two parallel dummy bar chains, a connecting piece is installed between the two dummy bar chains, and the roll gap gauge 6 is fixedly installed on the connecting piece. When the continuous casting blank works, the roll gap of the continuous casting machine can be measured in real time in the process that the dummy bar chain belt drives the roll gap meter 6 to move, and the roll gap of the counter roll 10 of the continuous casting machine can be detected in time to obtain an online roll gap value.
In an alternative embodiment, obtaining the measured roll gap value and the online roll gap value of the caster pair roll 10 comprises:
acquiring a measuring roll gap value of the end position of the twin roll 10 of the continuous casting machine fed back by the sensor 1;
an online roll gap value measured by the roll gap gauge 6 for the middle position of the twin roll 10 of the continuous casting machine is obtained.
Because the installation mode of the continuous casting machine pair roller 10 is that both ends are installed on corresponding axle seats, in the process of continuously casting a casting blank, the following reasons all can cause the abnormality or inaccuracy of the measured roll gap value data obtained by the sensor 1:
1. sensor anomalies or accumulated errors.
2. The bearings in the shaft seat are damaged.
3. Wear of the surface of the roller by the continuous casting machine; as the soft reduction technology is adopted, the blank pulling force is relatively increased, and the abrasion of the roller by the continuous casting machine of the sector section is increased.
4. The deformation of the frame structure, the frame structure includes upper frame and lower frame; when the blank stagnation accident occurs, if the casting blank is pulled out of the sector section by adopting a re-pulling mode, the frame of the sector section is possibly deformed, and the gap of each hinge point is enlarged.
5. In the offline maintenance process of the sector section, the machining concentricity precision of the roller sleeve of the roller pair of the continuous casting machine is insufficient, the roller pair of the continuous casting machine is not installed in place, and the gap between the rollers is increased.
6. The online working environment of the sector section has the characteristics of high temperature and high humidity, after the online working environment is used for a period of time, the roller surface of the sector section can be subjected to slag bonding and scale deposition, and the connecting plate and the frame can be deformed, so that adverse effects can be generated on the gap between the rollers.
7. And (3) mounting errors between the shaft seat and the bearing.
8. Slag is accumulated between the shaft seat and the distance block, and the distance block is arranged between the adjacent shaft seats.
9. The continuous casting machine breaks the roll.
Therefore, the accuracy of measuring the roll gap value of the end position of the twin roll of the continuous casting machine is not enough by using the sensor, and the roll gap value of the middle position of the twin roll of the continuous casting machine is significant for the integral control of the roll gap. The central position of the 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 formed in the roller gap control process due to the reasons are avoided.
In an alternative embodiment, the central position is a position interval that is less than 69mm from the midpoint of the caster pair roll 10.
Because the axial direction of the twin roll 10 of the continuous casting machine is a three-divided roll, the three-divided rolls are connected through a sectional bearing, and the sectional lengths of the twin roll 10 of the continuous casting machine are staggered vertically, transversely and longitudinally. Referring to fig. 3, fig. 3 is a schematic view of a transverse arrangement position of a roll gap gauge 6 according to an embodiment of the present invention, where a pair of rolls 10 of a continuous casting machine mainly comprises three rolls of types 1-9 in fig. 3 below, and a measurement width direction overlapping distance L1 is 178mm, so as to ensure that a measurement ball of the roll gap gauge 6 is within a range L1, and considering that a deviation condition exists in actual operation of a dummy bar 7, the deviation condition is generally within 20 mm. The transverse installation position of the roller gap meter 6 ensures that the measuring ball head is within the range L2.
L2＝L1-20×2＝138mm
Therefore, the middle position is set to be a position interval which is axially from the middle point to the two ends of the twin roll 10 of the continuous casting machine, the position interval is a distance range from the middle point to the two ends, which is smaller than 69mm, the measuring ball head of the roll gap meter 6 can be ensured to measure at the middle position in the range, and the accuracy of roll gap measurement can be further improved. After accurately obtaining the measured roll gap value and the online roll gap value by the method, the method proceeds to step 12.
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 use process, so that errors exist in the measurement of the roll gap value obtained at the middle position of the continuous casting machine pair roller 10, and the measurement of the measured roll gap value and the online roll gap value are limited. Therefore, the accuracy of the comprehensive roll gap value on roll gap control is better by measuring the roll gap value and the online roll gap value.
In an alternative embodiment, obtaining the integrated roll gap value from the measured roll gap value and the online roll gap value comprises:
according to the formula
Obtaining a comprehensive roll gap value;
wherein ,
for the combined roll gap value, αn is the measurement roll gap value +.>
On-line weight coefficient, beta n For the online roll gap value->
And (a) the measured weight coefficient, alpha n +β n ＝1。
It can be appreciated that the fine weighted analysis of the measured and online gap values to obtain a composite gap value balances the weights between the measured and online gap values. The higher the measurement accuracy is, the larger the corresponding value of the weight coefficient is, so that the reliability of the comprehensive roll gap value is improved.
In an alternative embodiment, before obtaining the integrated roll gap value according to the measured roll gap value and the online roll gap value, the method further comprises:
according to the historical measurement roll gap value and the historical online roll gap value of the historical rolling period, acquiring an online weight coefficient and a measurement weight coefficient of the current rolling period; the historical rolling period is the period above the current rolling period.
The historical measured roll gap value and the historical online roll gap value are measured values of the sensor 1 and the roll gap instrument 6 in the previous period; the on-line weight coefficient and the measured weight coefficient of the current rolling period are the current measured values of the sensor 1 and the roll gap gauge 6.
Because the deformation degree of the continuous casting machine pair roller 10 can change 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 fixed measured weight coefficient are adopted to obtain the comprehensive roll gap value, the obtained result is inaccurate. Therefore, with the change of the rolling period, the online weight coefficient and the measured weight coefficient are updated and corrected, the update and correction reflect the instant state of the roll gap of the roller 10 of the continuous casting machine, and the value accuracy of the online weight coefficient and the measured weight coefficient can be improved.
In an alternative embodiment, the online weight coefficient has a value ranging from 0.5 to 0.7; the value range of the measurement weight coefficient is 0.3-0.5.
It should be noted that, the above value range is determined through a large number of experiments based on the method according to the embodiment of the present invention, and the reliability of the comprehensive roll gap value obtained by calculation in the above value range is good. The value of the online weight coefficient and the value of the measured 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 value of the online weight coefficient and the value of the measured weight coefficient can be determined to meet the requirement.
In order to further improve the reliability of the comprehensive roll gap value, the embodiment of the invention further optimizes the value ranges of the online weight coefficient and the measured weight coefficient.
In an alternative embodiment, obtaining the online weight coefficient and the measured weight 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 includes:
dividing the value range of the online weight coefficient to obtain a plurality of first weight coefficient groups; dividing the value range of the measurement weight coefficient to obtain a plurality of second weight coefficient groups;
determining a target online weight coefficient in each first weight coefficient group; determining a target measurement weight coefficient in each second weight coefficient group;
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 differences;
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 measured weight coefficient of the current rolling period according to the first target weight coefficient group and the second target weight coefficient group.
The online weight coefficient and the measurement weight coefficient are divided into a value range, and the value range can be divided according to an upper limit interval value, a middle interval value and a lower limit interval value of the value range. Of course, the division can be further refined, the smaller the interval value of the division group is, the smaller the range of the first target weight coefficient group and the second target weight coefficient group which are correspondingly determined is, and the more accurate the online weight coefficient and the measured weight coefficient of the current rolling period are finally obtained; conversely, the larger.
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 of the corresponding divided block group can be obtained, so that the optimal first weight coefficient block group and the optimal second weight coefficient block group are analyzed and judged. The optimization mode has small calculated amount, and the first target weight coefficient group and the second target weight coefficient group which are optimized are determined accurately.
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 in a coefficient optimization interval or not according to each second roll gap difference value;
if yes, determining a first weight coefficient group and a second weight coefficient group corresponding to the current second roll gap difference value as a first target weight coefficient group and a second target weight coefficient group;
if not, discarding the first weight coefficient group and the second weight coefficient group 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 the second roll gap difference value can be calibrated and tested, so that an accurate coefficient optimization interval is obtained.
The embodiment of the invention further describes the optimization process of the online weight coefficient and the measured weight coefficient through a 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 of course, a plurality of groups may be used, and the number of packets marking one group is 1. Dividing the value ranges of the on-line weight coefficient and the measurement weight coefficient into three groups, respectively marking the three types of points as 1, 0 and-1, wherein the point type 1 is the extreme value of the value ranges of the on-line weight coefficient and the measurement weight coefficient, the point type 0 is the intermediate value of the value ranges, and the point type-1 is the value between the extreme value and the intermediate value in the value ranges. And correspondingly taking values of the on-line weight coefficient and the value range of the measured weight coefficient, inputting the values into a mixing test model, and obtaining a second roll gap difference value by using a response optimizer, wherein the second roll gap difference value is 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 an online weight coefficient and a measured weight coefficient provided by an embodiment of the present invention, where when the first target weight coefficient group is 0.52-0.58, the second roll gap difference is approximately 0.1mm; when the second target weight coefficient area is 0.42-0.48, the second roll gap difference is close to 0.1mm.
To further verify whether the first target weight coefficient granule and the second target weight coefficient granule meet the requirements. And determining an online weight coefficient and a measured weight coefficient according to the first target weight coefficient group and the second target weight coefficient group, and further obtaining the comprehensive roll gap value.
And step 13, obtaining a first roll gap difference value according to the comprehensive roll gap value and the target roll gap value required by the process.
Specifically, according to the formula
Obtaining a first roll gap difference value;
wherein ,
for the target roll gap value,/>
Is the first roll gap difference.
Referring to fig. 5, fig. 5 is a comparison chart of accuracy of the on-line weight coefficient and the measured weight coefficient before and after optimization according to an embodiment of the present invention. According to the value ranges of the online weight coefficient and the measured 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 measured weight coefficient by adopting a first target weight coefficient group and a second target weight coefficient group, 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 obviously reduced. Therefore, the accuracy of the value ranges of the online weight coefficient and the measured weight coefficient after optimization is higher, and the accuracy of the obtained first roll gap difference value is better.
And step 14, adjusting the roll gap of the twin roll 10 of the continuous casting machine according to the first roll gap difference value.
The roll gap can be controlled and adjusted based on the servo valve 3 driving the hydraulic cylinder 2, each segment position 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 the hydraulic cylinders 2 control the upper frame 4 to ascend or descend in a balanced manner, so that the roll gap between the continuous casting machine and the roll 10 is adjusted.
The technical scheme provided by the embodiment of the invention has at least the following advantages:
1. the method comprises the steps of obtaining a measured roll gap value and an online roll gap value of the twin rolls of the continuous casting machine, obtaining a comprehensive roll gap value according to the measured roll gap value and the online roll gap value, so that the roll gap of the twin rolls of the continuous casting machine is accurately adjusted, the control accuracy and stability can be improved, the defects of slab center segregation, looseness, angle cracks and the like are reduced, and the rolling quality of slabs is further improved.
2. The sensor and the roll gap instrument are utilized to monitor the continuous casting roll gap state in real time, the roll gap detection accuracy is improved, the roll gap value is precisely quantized and fed back for control, the refined weighting analysis is carried out, the sensor and the roll gap instrument are in coordination with the hydraulic cylinder and the servo valve of the sector section for dynamic control, the weighting coefficient is continuously optimized according to the actual measurement result, and the roll gap control accuracy is further improved.
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 continuous casting slabs is improved, and the high-quality development of enterprises is promoted.
Based on the same inventive concept as the roll gap control method, a roll gap control device is further provided in another embodiment of the present invention, and referring to fig. 6, fig. 6 is a schematic structural diagram of a roll gap control device provided in an embodiment of the present invention, where the roll gap control device includes:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a measured roll gap value of a pair of rollers of a continuous casting machine and an online roll gap value, 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 the target roll gap value required by the process;
and the adjusting module is used for adjusting the roll gap of the counter roll 10 of the continuous casting machine according to the first roll gap difference value.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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. It is therefore intended that the following claims be interpreted as including the 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. A roll gap control method, characterized by being applied to roll gap control of a continuous casting machine, comprising:
obtaining a measured roll gap value of a pair of rolls of a continuous casting machine and an online roll gap value, 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;
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 the target roll gap value required by the process;
adjusting the roll gap of the twin rolls of the continuous casting machine according to the first roll gap difference value;
the method for obtaining the measured roll gap value and the online roll gap value of the twin roll of the continuous casting machine comprises the following steps:
acquiring the measured roll gap value of the end position of the twin roll of the continuous casting machine fed back by a sensor;
acquiring the online roll gap value measured by a roll gap instrument on the middle position of the twin roll of the continuous casting machine;
the step of obtaining the comprehensive roll gap value according to the measured roll gap value and the online roll gap value comprises the following steps:
according to the formula
Obtaining a comprehensive roll gap value;
wherein ,
for the integrated roll gap value, < > is>
For the measuring roll gap value +.>
On-line weight coefficient,/->
For the online roll gap value +.>
Weight coefficient of measurement of->
；
Before the comprehensive roll gap value is obtained according to the measured roll gap value and the online roll gap value, the method further comprises the following steps:
according to the historical measurement roll gap value and the historical online roll gap value of the historical rolling period, acquiring the online weight coefficient and the measurement weight coefficient of the current rolling period; the historical rolling period is the period which is the last period of the current rolling period;
the step of obtaining the online weight coefficient and the measured weight coefficient of the current rolling period according to the historical measured roll gap value and the historical online roll gap value of the historical rolling period comprises the following steps:
dividing the value range of the online weight coefficient to obtain a plurality of first weight coefficient groups; dividing the value range of the measurement weight coefficient to obtain a plurality of second weight coefficient groups;
determining a target online weight coefficient in each first weight coefficient group; determining a target measurement weight coefficient in each second weight coefficient group;
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 differences;
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.
2. The roll gap control method of claim 1, wherein the intermediate position is a position interval having a distance of less than 69mm from a mid-point of the twin roll of the continuous casting machine.
3. The roll gap control method according to claim 1, 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.
4. The roll gap control method of claim 1, wherein the determining a first target weight coefficient group and a second target weight coefficient group from the 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 in a coefficient optimization interval or not according to each second roll gap difference value;
if yes, determining a first weight coefficient group and a second weight coefficient group corresponding to the current second roll gap difference value as a first target weight coefficient group and a second target weight coefficient group;
if not, discarding the first weight coefficient group and the second weight coefficient group corresponding to the current second roll gap difference value.
5. The roll gap control method of claim 4, wherein,
the first target weight coefficient group is 0.52-0.58;
the second target weight coefficient group is 0.42-0.48.
6. A roll gap control device used in the roll gap control method according to any one of claims 1 to 5, characterized in that the device is applied to roll gap control of a continuous casting machine, the device comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a measured roll gap value of a pair of rollers of a continuous casting machine and an online roll gap value, 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 the target roll gap value required by the process;
and the adjusting module is used for adjusting the roll gap of the twin rolls of the continuous casting machine according to the first roll gap difference value.
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