CN115990615A - Control method and device of roller press and roller press - Google Patents
Control method and device of roller press and roller press Download PDFInfo
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
- B21B37/20—Automatic gauge control in tandem mills
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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
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application discloses a control method and device of a roller press and the roller press. The method comprises the following steps: acquiring a first roll gap correction quantity of the roll squeezer under feedback delay through a smith predictor; obtaining a second roll gap correction quantity related to a feedback thickness, wherein the feedback thickness is the thickness of a battery pole piece after rolling by a roll squeezer; determining a total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction; and adjusting the pressing roll gap of the roll squeezer through the total roll gap correction. According to the control method of the roller press, the roller gap correction quantity of the roller press under feedback delay can be obtained through the smith predictor, the roller gap correction quantity fed back by the thickness gauge is corrected, thickness fluctuation caused by feedback delay is reduced, the rolling thickness deviation of the roller press is reduced, and the yield in battery production is improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a control method and device of a roller press and the roller press.
Background
With the rapid development of battery technology, the use of batteries (e.g., lithium batteries, etc.) is becoming more and more popular. The battery pole piece is used as one of basic components of the battery, and the manufacturing quality of the battery pole piece has a great influence on the performance of the battery, for example, the energy density, the capacity, the service life and the like of the battery. Among them, rolling is one of the important links in the manufacture of battery pole pieces, and the purpose of the rolling is to combine the active materials of the battery with the foil to make the product more solid and dense, and further to obtain the battery pole pieces with uniform thickness.
However, in the rolling process of the battery pole piece at present, the rolling thickness of the roller press may deviate, so that the rolled battery pole piece has abnormal thickness, and therefore, the defects of dislocation of the pole lug and the like occur, and the yield in the battery production is reduced.
Disclosure of Invention
The embodiment of the application aims to provide a control method and device of a roller press and the roller press, which can solve the problem that the yield in battery production is low due to deviation of rolling thickness at present.
In a first aspect, an embodiment of the present application provides a method for controlling a roller press, including:
acquiring a first roll gap correction quantity of the roll squeezer under feedback delay through a smith predictor;
obtaining a second roll gap correction quantity related to a feedback thickness, wherein the feedback thickness is the thickness of a battery pole piece after rolling by a roll squeezer;
determining a total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction;
and adjusting the pressing roll gap of the roll squeezer through the total roll gap correction.
In the embodiment of the application, a first roll gap correction quantity of the roll squeezer under feedback delay and a second roll gap correction quantity fed back by a thickness gauge at an outlet of the roll squeezer are obtained through a smith predictor; then, determining a total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction; finally, the reduction gap of the roll squeezer is adjusted by the total gap correction. Therefore, the roll gap correction quantity of the roll squeezer under feedback delay can be obtained through the smith predictor, the roll gap correction quantity fed back by the thickness gauge is corrected, thickness fluctuation caused by feedback hysteresis is reduced, the rolling thickness deviation of the roll squeezer is reduced, and the yield in battery production is improved.
In some embodiments, the obtaining, by the smith predictor, the first roll gap correction of the roll squeezer under the feedback delay includes:
acquiring a first thickness deviation based on the total roll gap correction in the previous control period;
calculating a third thickness deviation based on the first thickness deviation, a second thickness deviation and a time delay part, wherein the second thickness deviation is a deviation value obtained by comparing the feedback thickness with a preset thickness;
and inputting the third thickness deviation into an integral feedback closed loop to obtain a first roll gap correction quantity of the roll squeezer under feedback delay.
In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control period, the third thickness deviation is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge and the time-consuming portion, and the third thickness deviation is input into the integral feedback closed loop to obtain the first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the roll squeezer is further improved.
In some embodiments, the obtaining the first thickness deviation based on the total roll gap correction in the previous control period includes:
Acquiring a first pressure deviation and a rigidity coefficient of the roller press, and acquiring a total roll gap correction in a previous control period;
and calculating the ratio of the first pressure deviation to the rigidity coefficient, and determining the sum of the ratio and the total roll gap correction in the previous control period as a first thickness deviation.
In this embodiment, the ratio of the first pressure deviation and the stiffness coefficient of the roll squeezer and the sum of the total roll gap correction amount in the previous control period are determined as the first thickness deviation, so that the thickness deviation caused by the deformation of the roll squeezer is considered when the first thickness deviation is calculated, the calculated first thickness deviation is more reasonable, and the control accuracy of the roll squeezer is further improved.
In some embodiments, before the obtaining the pressure deviation and the stiffness coefficient of the roller press, the method further comprises:
acquiring at least one set of sampling data of the roller press in an offline test state, wherein each set of sampling data comprises a preset roller gap correction amount and a second pressure deviation when the roller press is pressed down by the preset roller gap correction amount;
And updating the rigidity coefficient of the roller press based on the at least one set of sampling data.
In this embodiment, according to the update of the rigidity coefficient of the roller press according to at least one set of acquired sampling data of the roller press, thereby realizing the timely update of the rigidity coefficient of the roller press, avoiding the influence on the first thickness deviation caused by the change of the rigidity coefficient of the roller press after the roller of the roller press is replaced or maintained, and further improving the accuracy of the first thickness deviation.
In some embodiments, the inputting the third thickness deviation into an integral feedback closed loop comprises:
inputting the product of the third thickness deviation and the first weight to an integral feedback closed loop;
the obtaining a second roll gap correction associated with the feedback thickness includes:
inputting the product of the second thickness deviation related to the feedback thickness and the second weight into an integral feedback closed loop to obtain a second roll gap correction;
the total roll gap correction is the sum of the first roll gap correction and the second roll gap correction.
In this embodiment, the first and second roll gap corrections are obtained by inputting the products of the third and second thickness deviations and the weights corresponding to the third and second thickness deviations into a feedback loop, respectively, and the sum of the first and second roll gap corrections is used as the total roll gap correction, so that the calculated total roll gap correction is more accurate, and the control accuracy of the roll press is further improved.
In some embodiments, the inputting the product of the third thickness deviation and the first weight into the integral feedback closed loop comprises:
acquiring a rigidity coefficient and a plasticity coefficient of the roller press, and calculating an elasticity index value of the roller press based on the rigidity coefficient and the plasticity coefficient;
and inputting the product of the elastic index value, the first weight and the third thickness deviation into an integral feedback closed loop.
In this embodiment, in calculating the first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the roll squeezer are also used as the input amount for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount is more accurate.
In a second aspect, an embodiment of the present application further provides a control device for a roller press, including:
the first correction acquiring module is used for acquiring a first roll gap correction of the roll squeezer under feedback delay through the smith predictor;
the second correction amount acquisition module is used for acquiring a second roll gap correction amount related to a feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after rolling by the roll squeezer;
the total correction acquiring module is used for determining the total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction;
And the adjusting module is used for adjusting the pressing roll gap of the roll squeezer through the total roll gap correction.
In the embodiment of the application, a first roll gap correction quantity of the roll squeezer under feedback delay and a second roll gap correction quantity fed back by a thickness gauge at an outlet of the roll squeezer are obtained through a smith predictor; then, determining a total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction; finally, the reduction gap of the roll squeezer is adjusted by the total gap correction. Therefore, the roll gap correction quantity of the roll squeezer under feedback delay can be obtained through the smith predictor, the roll gap correction quantity fed back by the thickness gauge is corrected, thickness fluctuation caused by feedback hysteresis is reduced, the rolling thickness deviation of the roll squeezer is reduced, and the yield in battery production is improved.
In some embodiments, the first correction amount acquisition module includes:
a first thickness deviation obtaining unit for obtaining a first thickness deviation based on a total roll gap correction amount in a previous control period;
a third thickness deviation obtaining unit, configured to calculate a third thickness deviation based on the first thickness deviation, the second thickness deviation, and the time interval, where the second thickness deviation is a deviation value obtained by comparing the feedback thickness with a preset thickness;
And the first correction acquiring unit is used for inputting the third thickness deviation into an integral feedback closed loop to obtain a first roll gap correction of the roll squeezer under feedback delay.
In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control period, the third thickness deviation is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge and the time-consuming portion, and the third thickness deviation is input into the integral feedback closed loop to obtain the first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the roll squeezer is further improved.
In some embodiments, the first thickness deviation acquisition unit includes:
an input quantity obtaining subunit, configured to obtain a first pressure deviation and a stiffness coefficient of the roller press, and obtain a total roll gap correction quantity in a previous control period;
and the first thickness deviation calculating subunit is used for calculating the ratio of the first pressure deviation to the rigidity coefficient and determining the sum of the ratio and the total roll gap correction in the previous control period as the first thickness deviation.
In this embodiment, the ratio of the first pressure deviation and the stiffness coefficient of the roll squeezer and the sum of the total roll gap correction amount in the previous control period are determined as the first thickness deviation, so that the thickness deviation caused by the deformation of the roll squeezer is considered when the first thickness deviation is calculated, the calculated first thickness deviation is more reasonable, and the control accuracy of the roll squeezer is further improved.
In some embodiments, the apparatus further comprises:
the sampling data acquisition module is used for acquiring at least one group of sampling data of the roller press when the roller press is in an offline test state, wherein each group of sampling data comprises a preset roller gap correction amount and a second pressure deviation when the roller press is pressed down by the roller press is adjusted through the preset roller gap correction amount;
and the rigidity coefficient updating module is used for updating the rigidity coefficient of the roller press based on the at least one group of sampling data.
In this embodiment, according to the update of the rigidity coefficient of the roller press according to at least one set of acquired sampling data of the roller press, thereby realizing the timely update of the rigidity coefficient of the roller press, avoiding the influence on the first thickness deviation caused by the change of the rigidity coefficient of the roller press after the roller of the roller press is replaced or maintained, and further improving the accuracy of the first thickness deviation.
In some embodiments, the first correction amount acquisition unit is specifically configured to:
inputting the product of the third thickness deviation and the first weight to an integral feedback closed loop;
the second correction amount acquisition module is specifically configured to:
inputting the product of the second thickness deviation related to the feedback thickness and the second weight into an integral feedback closed loop to obtain a second roll gap correction;
The total roll gap correction is the sum of the first roll gap correction and the second roll gap correction.
In this embodiment, the first and second roll gap corrections are obtained by inputting the products of the third and second thickness deviations and the weights corresponding to the third and second thickness deviations into a feedback loop, respectively, and the sum of the first and second roll gap corrections is used as the total roll gap correction, so that the calculated total roll gap correction is more accurate, and the control accuracy of the roll press is further improved.
In some embodiments, the first correction amount acquisition unit includes:
the elastic index value calculation subunit is used for acquiring the rigidity coefficient and the plasticity coefficient of the roller press and calculating the elastic index value of the roller press based on the rigidity coefficient and the plasticity coefficient;
and the first correction amount acquisition subunit is used for inputting the product of the elastic index value, the first weight and the third thickness deviation into an integral feedback closed loop.
In this embodiment, in calculating the first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the roll squeezer are also used as the input amount for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount is more accurate.
In a third aspect, embodiments of the present application provide a roller press, including a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method according to the first aspect.
In a fourth aspect, embodiments of the present application provide a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps of the method according to the first aspect.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:
FIG. 1 is one of the schematic diagrams of the control process of a roller press according to some embodiments of the present application;
FIG. 2 is a flow chart of a method of controlling a roller press according to some embodiments of the present application;
FIG. 3 is a second schematic diagram of a control process of a roller press according to some embodiments of the present disclosure;
FIG. 4 is a schematic diagram of a sampling data acquisition process according to some embodiments of the present application;
FIG. 5 is a schematic view of a control device of a roller press according to some embodiments of the present application;
fig. 6 is a schematic hardware structure of a roller press according to some embodiments of the present application.
Detailed Description
Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Currently, in the rolling process of battery pole pieces, a control system of a roll squeezer generally adopts feedback automatic gain control (Automatic Gain Control, AGC) (also referred to as "monitoring AGC") to eliminate outlet thickness deviation caused by factors such as material hardness change, pressing condition change, thermal expansion of a press roll and the like. As shown in fig. 1, in the control system of the roll squeezer, a thickness gauge (such as a laser thickness gauge) is arranged at the outlet of the output electrode pole piece of the roll squeezer, the thickness deviation Δh of the thickness of the battery pole piece at the outlet from a target value is measured by the thickness gauge, the reduction position correction quantity Δsfb is calculated according to the thickness deviation Δh and the formula (1), and the reduction gap of the roll squeezer is adjusted by the Δsfb. Wherein the feedback AGC control is an integral control.
In the formula (1), KFB represents a gain factor related to the relative thickness differential value measured by the thickness gauge after the roll squeezer;
m represents the material constant of the roller press;
k represents the rigidity coefficient of the roller press.
However, short-term deviations are not corrected by feedback control, since the deviations are measured after the roll gap. While the actual value measured is determined by the thickness measurement time and the additional speed lag time. The shorter the distance between the roll gap and the thickness measurement, the better the quality of the feedback measurement control loop. Thus, feedback hysteresis in the adjustment process can cause thickness fluctuation, so that deviation occurs in the rolling thickness of the roller press, and the yield in battery production is reduced.
In order to reduce thickness fluctuation caused by feedback hysteresis in the adjustment process, so as to reduce deviation of rolling thickness of the roller press, and further improve yield in battery production, the application provides a control method of the roller press.
The control method of the roller press provided by the embodiment of the application is described in detail below through specific embodiments and application scenes thereof with reference to the accompanying drawings.
Referring to fig. 2, an embodiment of the present application provides a control method of a roller press, which is applied to the roller press, as shown in fig. 2, and the method may include the following steps 201 to 204.
Step 201, obtaining a first roll gap correction amount of the roll squeezer under feedback delay through a smith predictor.
And 202, acquiring a second roll gap correction quantity related to the feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after rolling by the roll squeezer.
Step 203, determining the total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction.
And 204, adjusting the pressing roll gap of the roll squeezer through the total roll gap correction.
In the step 201, during the process of rolling the battery pole piece by the roller press, the control system of the roller press may obtain the first roll gap correction amount of the roller press under the feedback delay through the smith predictor.
The obtaining, by the smith predictor, the first roll gap correction amount of the roll squeezer under the feedback delay may be that a thickness model in a controlled process is estimated in advance, and the smith predictor is connected in parallel to the controlled process, so that the smith predictor compensates the thickness deviation fed back by the thickness gauge under the feedback delay time, and obtains the thickness deviation compensation amount under the feedback delay time, and the first roll gap correction amount is obtained according to the thickness deviation compensation amount.
Specifically, the thickness deviation may be obtained by the above thickness model, and may be calculated based on the roll gap correction amounts determined in N history control periods, where N may be an integer greater than 1, for example, the average value of the total roll gap correction amounts determined in the first 10 control periods may be determined as the above thickness deviation, or the like; and tracking the calculated thickness deviation to a thickness gauge, calculating to obtain a thickness deviation compensation amount under the feedback delay time according to the calculated thickness deviation and the thickness deviation fed back by the thickness gauge and a time delay part, and finally introducing the thickness deviation compensation amount under the feedback delay time into an integral feedback closed loop to obtain the first roll gap correction amount.
In the step 202, during the rolling of the battery pole piece by the roller press, the thickness gauge disposed at the outlet of the roller press may measure the thickness of the rolled battery pole piece, and the measured thickness may be used as a feedback thickness feedback value of the control system of the roller press, and the control system of the roller press may determine the second roll gap correction amount associated with the feedback thickness according to the feedback thickness.
The determining, according to the feedback thickness, the second roll gap correction associated with the feedback thickness may be that the roll press control system compares the feedback thickness with a preset thickness to obtain a thickness deviation of the feedback thickness, and introduces the thickness deviation of the feedback thickness into an integral feedback closed loop to obtain the second roll gap correction.
It should be noted that the execution sequence of the step 201 and the step 202 may be performed in no order, that is, the step 201 may be performed before the step 202, or the step 201 may be performed after the step 202, or the step 201 may be performed simultaneously with the step 202, but fig. 2 in the embodiment of the present application only shows the case where the step 201 is performed before the step 202, which is not limited herein.
In the step 203, after the first and second roll gap corrections are obtained by the roll squeezer, the roll squeezer may determine a total roll gap correction of the roll squeezer based on the first and second roll gap corrections.
The total roll gap correction amount of the roll squeezer may be determined based on the first roll gap correction amount and the second roll gap correction amount, and a sum of the first roll gap correction amount and the second roll gap correction amount may be used as the total roll gap correction amount.
Alternatively, the weight of the first gap correction amount and the weight of the second gap correction amount may be pre-arranged in the roll squeezer, the total gap correction amount of the roll squeezer may be determined based on the first gap correction amount and the second gap correction amount, a product of the first gap correction amount and the weight thereof and a product of the second gap correction amount and the weight thereof may be calculated, and a sum of the two products may be determined as the total gap correction amount.
In the step 204, after the total roll gap correction is determined by the roll squeezer, the control system of the roll squeezer may input the total roll gap correction into a pressure system of the roll squeezer to adjust the pressure of the pressure system to achieve adjustment of the reduction roll gap of the roll squeezer by the total roll gap correction.
In the embodiment of the application, a first roll gap correction quantity of the roll squeezer under feedback delay and a second roll gap correction quantity fed back by a thickness gauge at an outlet of the roll squeezer are obtained through a smith predictor; then, determining a total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction; finally, the reduction gap of the roll squeezer is adjusted by the total gap correction. Therefore, the roll gap correction quantity of the roll squeezer under feedback delay can be obtained through the smith predictor, the roll gap correction quantity fed back by the thickness gauge is corrected, thickness fluctuation caused by feedback hysteresis is reduced, the rolling thickness deviation of the roll squeezer is reduced, and the yield in battery production is improved.
In some embodiments, the step 201 may include: acquiring a first thickness deviation based on the total roll gap correction in the previous control period; calculating to obtain a third thickness deviation based on the first thickness deviation, the second thickness deviation and the time delay part, wherein the second thickness deviation is a deviation value obtained by comparing the feedback thickness with a preset thickness; and inputting the third thickness deviation into an integral feedback closed loop to obtain a first roll gap correction quantity of the roll squeezer under feedback delay.
The first thickness deviation may be obtained based on the total roll gap correction in the previous control period, by directly using the total roll gap correction as the first thickness deviation, or by determining the product of the total roll gap correction and a preset coefficient as the first thickness deviation, or the like.
The third thickness deviation is calculated based on the first thickness deviation, the second thickness deviation, and the time delay section, and may be calculated by the following formula (2).
h ε ＝Δh+Δh 1 -e -TS ·Δh 1 (2)
In the formula (2), Δh represents the second thickness deviation;
Δh described above 1 Representing a first thickness deviation;
e above -TS Representing a time delay portion;
Δh described above ε Representing a third thickness deviation.
The third thickness deviation is input to the integral feedback closed loop, so as to obtain the first roll gap correction amount of the roll squeezer under the feedback delay, and the third thickness deviation may be directly input to the integral feedback closed loop.
In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control period, the third thickness deviation is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge and the time-consuming portion, and the third thickness deviation is input into the integral feedback closed loop to obtain the first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the roll squeezer is further improved.
In some embodiments, the obtaining the first thickness deviation based on the total roll gap correction in the previous control period may include: acquiring a first pressure deviation and a rigidity coefficient of the roller press, and acquiring a total roll gap correction in a previous control period; and calculating the ratio of the first pressure deviation to the stiffness coefficient, and determining the sum of the ratio and the total roll gap correction in the previous control period as the first thickness deviation.
The calculating of the first thickness deviation may be implemented by the following formula (3):
Δp represents a first pressure deviation of the roller press in the current control cycle;
k represents the rigidity coefficient of a roller of the roller press;
ΔS t-1 a total roll gap correction representing a previous control period;
Δh 1 the first thickness deviation is indicated.
The first pressure deviation is a pressure variation of the pressure system of the roller press when the control roller is pressed down.
It should be noted that, the stiffness coefficient may be a preset value in the roll squeezer, and the preset value is fixed.
In this embodiment, the ratio of the first pressure deviation and the stiffness coefficient of the roll squeezer and the sum of the total roll gap correction amount in the previous control period are determined as the first thickness deviation, so that the thickness deviation caused by the deformation of the roll squeezer is considered when the first thickness deviation is calculated, the calculated first thickness deviation is more reasonable, and the control accuracy of the roll squeezer is further improved.
In some embodiments, before the obtaining the pressure deviation and the stiffness coefficient of the roller press, the method may further include: acquiring at least one set of sampling data of the roller press in an offline test state, wherein each set of sampling data comprises a preset roller gap correction amount and a second pressure deviation when the roller press is pressed down by the preset roller gap correction amount; based on at least one set of sampled data, the stiffness coefficient of the roller press is updated.
Each set of sampling data in the at least one set of sampling data is measured in an offline test state of the roller press, and can be obtained by acquiring a second pressure deviation of the roller press under the preset roller gap correction when the change amount of the reduction roller gap of the roller press is the preset roller gap correction under the condition that the roller press is started, so that sampling data comprising the preset roller gap correction and the second pressure deviation are obtained.
It should be noted that, in order to ensure the accuracy of the sampled data, at least one of the following may be satisfied in the process of acquiring the sampled data:
the roller press has no bending force;
the testing speed of the main motor of the roller press is fixed;
and taking the average value of the pressure deviations of a plurality of positions in the rotating process as the second pressure deviation for each rotation of the roller wheel so as to eliminate the influence of the eccentric center of the roller wheel on the measured data, and the like.
In addition, the updating of the rigidity coefficient of the roller press based on at least one set of sampling data may be performed by calculating a rigidity coefficient according to each set of sampling data, so as to obtain at least one rigidity coefficient, and taking an average value of the at least one rigidity coefficient as the rigidity coefficient of the roller press. The stiffness coefficient calculated according to the sampled data can be realized by the following formula (4).
The delta S is 0 Representing a preset roll gap correction in the sampled data;
the Δp represents a second pressure deviation in the sampled data;
and K represents the rigidity coefficient of the roller press obtained through calculation of sampling data.
In this embodiment, according to the update of the rigidity coefficient of the roller press according to at least one set of acquired sampling data of the roller press, thereby realizing the timely update of the rigidity coefficient of the roller press, avoiding the influence on the first thickness deviation caused by the change of the rigidity coefficient of the roller press after the roller of the roller press is replaced or maintained, and further improving the accuracy of the first thickness deviation.
In some embodiments, the inputting the third thickness deviation into the integral feedback loop may include: the product of the third thickness deviation and the first weight is input to an integral feedback closed loop. Acquiring a second roll gap correction associated with the feedback thickness may include: and inputting the product of the second thickness deviation related to the feedback thickness and the second weight into an integral feedback closed loop to obtain a second roll gap correction. The total roll gap correction is the sum of the first roll gap correction and the second roll gap correction.
The first weight and the second weight may be values preset in the roller press, and a sum of the first weight and the second weight is 1.
In addition, the above-mentioned product of the third thickness deviation and the first weight may be directly input to the integral feedback closed loop, that is, by the following formula (5).
In the above-mentioned formula (5),
representing a first weight; h ε Indicating a first roll gap modifier.
Similarly, the second roll gap correction amount obtained by inputting the product of the second thickness deviation associated with the feedback thickness and the second weight to the integral feedback closed loop may be achieved by the following formula (6).
In the above-mentioned formula (6),
representing a second weight; and Δh represents the first roll gap correction amount.
The total roll gap correction amount is the sum of the first roll gap correction amount and the second roll gap correction amount, and can be calculated by the following formula (7).
ΔS t ＝ΔS1+ΔS2 (7)
In this embodiment, the first and second roll gap corrections are obtained by inputting the products of the third and second thickness deviations and the weights corresponding to the third and second thickness deviations into a feedback loop, respectively, and the sum of the first and second roll gap corrections is used as the total roll gap correction, so that the calculated total roll gap correction is more accurate, and the control accuracy of the roll press is further improved.
In some embodiments, inputting the product of the third thickness deviation and the first weight to the integral feedback closed loop comprises:
acquiring a rigidity coefficient and a plasticity coefficient of the roller press, and calculating an elasticity index value of the roller press based on the rigidity coefficient and the plasticity coefficient;
and inputting the product of the elastic index value, the first weight and the third thickness deviation into an integral feedback closed loop.
The elastic index value of the roll squeezer is calculated based on the rigidity coefficient and the plasticity coefficient, and may be calculated by the following formula (8).
E＝K+M(1-α)/K (8)
In the above formula (8), E represents an elastic index value, K represents a stiffness coefficient, M represents a plasticity coefficient, and α is a preset value of 0 to 1.
In this way, the product of the elastic index value, the first weight, and the third thickness deviation is input to the integral feedback loop, and may be calculated by the following formula (9).
In this embodiment, in calculating the first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the roll squeezer are also used as the input amount for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount is more accurate.
It should be noted that, the roll squeezer in the embodiment of the present application may be, but is not limited to, a roll squeezer for rolling battery electrode sheets.
In order to better understand the control method of the roller press provided in the embodiment of the present application, the embodiment of the control method of the roller press in practical application is provided herein for explanation, which is specifically as follows:
as shown in fig. 3, the calculated thickness and the actual thickness deviate due to load disturbance or inaccuracy of the equation of bounce, and in order to compensate for the deviation, the first thickness deviation may be calculated by a thickness calculation model, see the above formula (3). Tracking the first thickness deviation to a thickness tracking table by using a rotary position encoder (SE) on the motor, and comparing the second thickness deviation obtained according to the thickness detected by the thickness gauge to obtain a third thickness deviation, see formula (3). And introducing the third thickness deviation into an integral feedback closed loop through a Smith estimation strategy to obtain a first roll gap correction quantity delta S1, which is shown in a formula (9). To eliminate systematic deviations generated by the gauge sensor and the Smith algorithm itself to improve thickness accuracy, a second thickness deviation is introduced into the integral feedback loop to generate a second roll gap correction Δs2, see equation (6). And obtaining the sum of the first roll gap correction quantity delta S1 and the second roll gap correction quantity delta S2 to obtain delta S, referring to a formula (7), and adjusting the reduction roll gap of the roll squeezer through the delta S.
In addition, M pieces of sampling data (i.e., the at least one piece of sampling data) may be collected when the roll squeezer is in an offline test state, so as to calculate and obtain a stiffness coefficient of the roll squeezer, where M is a positive integer. As shown in fig. 4, the process of acquiring M pieces of sample data may include steps 401 to 413 as follows.
Step 402, the roller press is used for initializing the rigidity measurement of the roller press in response to the received operation.
And 403, opening the roll gap to an unloading position by the roll squeezer.
Step 404, activating the combining roller by a position control mode of the roller press.
And 405, activating a rolling force control mode of the roller press, and closing the roller gap to reach the minimum pressure.
Step 406, the roller press controls the roller motor to start.
And 407, controlling the position of the roller press to be activated in an empty mode under the condition that the roller press detects that the roller speed is greater than zero, and closing the roller gap to reach the initial position of rigidity measurement.
In step 408, the roll squeezer measures the pressure deviation several times at the initial position of rigidity measurement, and calculates the average value.
Step 409, the roller press determines whether M different average values have been obtained, and if not, step 410 is executed; if yes, go to step 411.
Step 410, the roller press increases the preset roller gap correction, and step 407 is re-executed.
Step 411, the roll squeezer opens the roll gap to a minimum pressure.
And 412, controlling the roller to stop rotating by the roller press.
And 413, controlling the roll gap to be opened to a fixed value by the roll squeezer.
Wherein each of the M different average values and the preset roll gap correction amount form one sampling data to obtain M sampling data
A control device of a roll squeezer according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.
Fig. 5 is a schematic structural diagram of a control device of a roller press according to an embodiment of the present application. As shown in fig. 5, the control device 500 of the roll squeezer includes a first correction amount acquisition module 501, a second correction amount acquisition module 502, a total correction amount acquisition module 503, and an adjustment module 504.
The first correction obtaining module 501 is configured to obtain, by using a smith predictor, a first roll gap correction of the roll squeezer under a feedback delay.
The second correction amount obtaining module 502 is configured to obtain a second roll gap correction amount associated with a feedback thickness, where the feedback thickness is a thickness of the battery pole piece after rolling by the roll squeezer.
The total correction amount acquisition module 503 is configured to determine a total roll gap correction amount of the roll squeezer based on the first roll gap correction amount and the second roll gap correction amount.
The adjustment module 504 is used to adjust the reduction gap of the calender by the total gap correction.
In the embodiment of the application, a first roll gap correction quantity of the roll squeezer under feedback delay and a second roll gap correction quantity fed back by a thickness gauge at an outlet of the roll squeezer are obtained through a smith predictor; then, determining a total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction; finally, the reduction gap of the roll squeezer is adjusted by the total gap correction. Therefore, the roll gap correction quantity of the roll squeezer under feedback delay can be obtained through the smith predictor, the roll gap correction quantity fed back by the thickness gauge is corrected, thickness fluctuation caused by feedback hysteresis is reduced, the rolling thickness deviation of the roll squeezer is reduced, and the yield in battery production is improved.
In some embodiments, the first correction amount acquisition module 501 may include a first thickness deviation acquisition unit, a third thickness deviation acquisition unit, and a first correction amount acquisition unit.
The first thickness deviation acquisition unit is used for acquiring a first thickness deviation based on the total roll gap correction amount in the previous control period.
The third thickness deviation obtaining unit is used for calculating and obtaining a third thickness deviation based on the first thickness deviation, the second thickness deviation and the time delay part, wherein the second thickness deviation is a deviation value obtained by comparing the feedback thickness with the preset thickness.
The first correction acquiring unit is used for inputting the third thickness deviation into the integral feedback closed loop to obtain a first roll gap correction of the roll squeezer under feedback delay.
In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control period, the third thickness deviation is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge and the time-consuming portion, and the third thickness deviation is input into the integral feedback closed loop to obtain the first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the roll squeezer is further improved.
In some embodiments, the first thickness deviation obtaining unit may include a first correction amount obtaining unit and a first thickness deviation calculating subunit.
The input quantity acquisition subunit is used for acquiring a first pressure deviation and a rigidity coefficient of the roller press and acquiring a total roller gap correction quantity in the previous control period;
the first thickness deviation calculating subunit is used for calculating the ratio of the first pressure deviation to the stiffness coefficient, and determining the sum of the ratio and the total roll gap correction in the previous control period as the first thickness deviation.
In this embodiment, the ratio of the first pressure deviation and the stiffness coefficient of the roll squeezer and the sum of the total roll gap correction amount in the previous control period are determined as the first thickness deviation, so that the thickness deviation caused by the deformation of the roll squeezer is considered when the first thickness deviation is calculated, the calculated first thickness deviation is more reasonable, and the control accuracy of the roll squeezer is further improved.
In some embodiments, the apparatus 500 may further include a sample data acquisition module and a stiffness coefficient update module.
The sampling data acquisition module is used for acquiring at least one group of sampling data of the roller press when the roller press is in an offline test state, wherein each group of sampling data comprises a preset roller gap correction amount and a second pressure deviation when the roller press is pressed down by the preset roller gap correction amount.
The rigidity coefficient updating module is used for updating the rigidity coefficient of the roller press based on at least one group of sampling data.
In this embodiment, according to the update of the rigidity coefficient of the roller press according to at least one set of acquired sampling data of the roller press, thereby realizing the timely update of the rigidity coefficient of the roller press, avoiding the influence on the first thickness deviation caused by the change of the rigidity coefficient of the roller press after the roller of the roller press is replaced or maintained, and further improving the accuracy of the first thickness deviation.
In some embodiments, the first correction amount acquisition unit may specifically be configured to: the product of the third thickness deviation and the first weight is input to an integral feedback closed loop.
The second correction amount acquisition module may specifically be configured to: and inputting the product of the second thickness deviation related to the feedback thickness and the second weight into an integral feedback closed loop to obtain a second roll gap correction.
The total roll gap correction may be a sum of the first roll gap correction and the second roll gap correction.
In this embodiment, the first and second roll gap corrections are obtained by inputting the products of the third and second thickness deviations and the weights corresponding to the third and second thickness deviations into a feedback loop, respectively, and the sum of the first and second roll gap corrections is used as the total roll gap correction, so that the calculated total roll gap correction is more accurate, and the control accuracy of the roll press is further improved.
In some embodiments, the first correction amount acquisition unit may include an elasticity index value calculation subunit and an elasticity index value calculation subunit.
The elasticity index value calculation subunit is used for obtaining the rigidity coefficient and the plasticity coefficient of the roller press and calculating the elasticity index value of the roller press based on the rigidity coefficient and the plasticity coefficient.
The first correction amount acquisition subunit is used for inputting the product of the elasticity index value, the first weight and the third thickness deviation into the integral feedback closed loop.
In this embodiment, in calculating the first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the roll squeezer are also used as the input amount for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount is more accurate.
Other details of the control device of the roller press according to the embodiment of the present application are similar to the control method of the roller press described above in connection with the examples shown in fig. 2 to 4, and can achieve the corresponding technical effects thereof, and for brevity, the description is omitted here.
Fig. 6 shows a schematic hardware structure of a roller press provided in an embodiment of the present application.
The calender may include a processor 601 and a memory 602 in which computer program instructions are stored.
In particular, the processor 601 may include a central processing unit (Central Processing Unit, CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured to implement one or more integrated circuits of embodiments of the present application.
In some examples, memory 602 may be Read Only Memory (ROM). In one example, the ROM may be mask-programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.
The memory 602 may include Read Only Memory (ROM), random Access Memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical/tangible memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions and when the software is executed (e.g., by one or more processors) it is operable to perform the operations described with reference to methods in accordance with aspects of the present disclosure.
The processor 601 reads and executes the computer program instructions stored in the memory 602 to implement the method in the embodiment shown in fig. 2 to 4, and achieves the corresponding technical effects achieved by executing the method/steps in the embodiment shown in fig. 2 to 4, which are not described herein for brevity.
In one example, the roller press may also include a communication interface 603 and a bus 604. As shown in fig. 6, the processor 601, the memory 602, and the communication interface 603 are connected to each other through the bus 604 and perform communication with each other.
The communication interface 603 is mainly configured to implement communication between each module, apparatus, unit and/or device in the embodiments of the present application.
The roller press can execute the control method of the roller press in the embodiment of the application, thereby realizing the control method of the roller press and the device thereof described in connection with fig. 2 to 5.
In addition, in combination with the method and the device for controlling the roller press in the above embodiments, the embodiments of the present application may provide a computer storage medium for implementation. The computer storage medium has stored thereon computer program instructions; the computer program instructions, when executed by the processor, implement any of the batteries of the above embodiments and a control method thereof.
It should be clear that the present application is not limited to the particular arrangements and processes described above and illustrated in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps, after appreciating the spirit of the present application.
The functional blocks shown in the above block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be different from the order in the embodiments, or several steps may be performed simultaneously.
Aspects of the present disclosure are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus, devices, and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of 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, 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, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to being, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware which performs the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (14)
1. A control method of a roll squeezer, comprising:
acquiring a first roll gap correction quantity of the roll squeezer under feedback delay through a smith predictor;
obtaining a second roll gap correction quantity related to a feedback thickness, wherein the feedback thickness is the thickness of a battery pole piece after rolling by a roll squeezer;
Determining a total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction;
and adjusting the pressing roll gap of the roll squeezer through the total roll gap correction.
2. The method of claim 1, wherein the obtaining, by the smith predictor, the first roll gap correction of the roll squeezer at the feedback delay comprises:
acquiring a first thickness deviation based on the total roll gap correction in the previous control period;
calculating a third thickness deviation based on the first thickness deviation, a second thickness deviation and a time delay part, wherein the second thickness deviation is a deviation value obtained by comparing the feedback thickness with a preset thickness;
and inputting the third thickness deviation into an integral feedback closed loop to obtain a first roll gap correction quantity of the roll squeezer under feedback delay.
3. The method of claim 2, wherein the obtaining a first thickness deviation based on the total roll gap correction in the previous control period comprises:
acquiring a first pressure deviation and a rigidity coefficient of the roller press, and acquiring a total roll gap correction in a previous control period;
And calculating the ratio of the first pressure deviation to the rigidity coefficient, and determining the sum of the ratio and the total roll gap correction in the previous control period as a first thickness deviation.
4. The method of claim 3, wherein prior to said obtaining the pressure bias and stiffness coefficient of the roller press, the method further comprises:
acquiring at least one set of sampling data of the roller press in an offline test state, wherein each set of sampling data comprises a preset roller gap correction amount and a second pressure deviation when the roller press is pressed down by the preset roller gap correction amount;
and updating the rigidity coefficient of the roller press based on the at least one set of sampling data.
5. The method according to any one of claims 2 to 4, wherein said inputting the third thickness deviation into an integral feedback closed loop comprises:
inputting the product of the third thickness deviation and the first weight to an integral feedback closed loop;
the obtaining a second roll gap correction associated with the feedback thickness includes:
inputting the product of the second thickness deviation related to the feedback thickness and the second weight into an integral feedback closed loop to obtain a second roll gap correction;
The total roll gap correction is the sum of the first roll gap correction and the second roll gap correction.
6. The method of claim 5, wherein said inputting the product of the third thickness deviation and the first weight to the integral feedback closed loop comprises:
acquiring a rigidity coefficient and a plasticity coefficient of the roller press, and calculating an elasticity index value of the roller press based on the rigidity coefficient and the plasticity coefficient;
and inputting the product of the elastic index value, the first weight and the third thickness deviation into an integral feedback closed loop.
7. A control device of a roll squeezer, comprising:
the first correction acquiring module is used for acquiring a first roll gap correction of the roll squeezer under feedback delay through the smith predictor;
the second correction amount acquisition module is used for acquiring a second roll gap correction amount related to a feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after rolling by the roll squeezer;
the total correction acquiring module is used for determining the total roll gap correction of the roll squeezer based on the first roll gap correction and the second roll gap correction;
and the adjusting module is used for adjusting the pressing roll gap of the roll squeezer through the total roll gap correction.
8. The apparatus of claim 7, wherein the first modifier-acquisition module comprises:
a first thickness deviation obtaining unit for obtaining a first thickness deviation based on a total roll gap correction amount in a previous control period;
a third thickness deviation obtaining unit, configured to calculate a third thickness deviation based on the first thickness deviation, the second thickness deviation, and the time interval, where the second thickness deviation is a deviation value obtained by comparing the feedback thickness with a preset thickness;
and the first correction acquiring unit is used for inputting the third thickness deviation into an integral feedback closed loop to obtain a first roll gap correction of the roll squeezer under feedback delay.
9. The apparatus according to claim 8, wherein the first thickness deviation acquisition unit includes:
an input quantity obtaining subunit, configured to obtain a first pressure deviation and a stiffness coefficient of the roller press, and obtain a total roll gap correction quantity in a previous control period;
and the first thickness deviation calculating subunit is used for calculating the ratio of the first pressure deviation to the rigidity coefficient and determining the sum of the ratio and the total roll gap correction in the previous control period as the first thickness deviation.
10. The apparatus of claim 9, wherein the apparatus further comprises:
the sampling data acquisition module is used for acquiring at least one group of sampling data of the roller press when the roller press is in an offline test state, wherein each group of sampling data comprises a preset roller gap correction amount and a second pressure deviation when the roller press is pressed down by the roller press is adjusted through the preset roller gap correction amount;
and the rigidity coefficient updating module is used for updating the rigidity coefficient of the roller press based on the at least one group of sampling data.
11. The apparatus according to any one of claims 8 to 10, wherein the first correction amount acquisition unit is specifically configured to:
inputting the product of the third thickness deviation and the first weight to an integral feedback closed loop;
the second correction amount acquisition module is specifically configured to:
inputting the product of the second thickness deviation related to the feedback thickness and the second weight into an integral feedback closed loop to obtain a second roll gap correction;
the total roll gap correction is the sum of the first roll gap correction and the second roll gap correction.
12. The apparatus according to claim 11, wherein the first correction amount acquisition unit includes:
The elastic index value calculation subunit is used for acquiring the rigidity coefficient and the plasticity coefficient of the roller press and calculating the elastic index value of the roller press based on the rigidity coefficient and the plasticity coefficient;
and the first correction amount acquisition subunit is used for inputting the product of the elastic index value, the first weight and the third thickness deviation into an integral feedback closed loop.
13. A roller press comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, which program or instruction when executed by the processor implements the steps of the method of controlling a roller press according to any one of claims 1 to 6.
14. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the control method of a roller press according to any one of claims 1-6.
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| CN202111222058.7A CN115990615B (en) | 2021-10-20 | 2021-10-20 | Control method and device of roller press and roller press |
| PCT/CN2022/124722 WO2023066093A1 (en) | 2021-10-20 | 2022-10-11 | Control method and apparatus for roller press, and roller press |
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| CN107363105A (en) * | 2017-07-20 | 2017-11-21 | 首钢集团有限公司 | A kind of control method and device of hot rolled coil head thickness |
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| WO2023066093A1 (en) | 2023-04-27 |
| CN115990615B (en) | 2024-04-05 |
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