CN114481232B - On-line control system and control method for surface density uniformity of electrolytic copper foil - Google Patents
On-line control system and control method for surface density uniformity of electrolytic copper foil Download PDFInfo
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 239000011889 copper foil Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000005259 measurement Methods 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000011888 foil Substances 0.000 claims abstract description 37
- 238000004364 calculation method Methods 0.000 claims abstract description 22
- 238000009826 distribution Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 29
- 238000001739 density measurement Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 229910000365 copper sulfate Inorganic materials 0.000 description 3
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/04—Wires; Strips; Foils
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Automation & Control Theory (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention relates to an online control system and a control method for the surface density uniformity of electrolytic copper foil, wherein the online control system comprises a plurality of electromagnetic flow valves which are respectively connected with a plurality of liquid distribution pipelines which are arranged on an anode groove of a foil forming machine side by side along the width direction of a cathode roller of the foil forming machine; a controller electrically connected to the plurality of electromagnetic flow valves, respectively; an on-line thickness gauge; the system host machine is in signal connection with the online thickness gauge and the controller, and the control method for the online control system comprises the following steps: an areal density acquisition step, a data characteristic calculation step, an engineering capacity calculation step and a PID control step. According to the online control system and the online control method, the electromagnetic flow control valve arranged on the liquid distribution pipeline at the corresponding position is adjusted through the feedback of the measurement data of the online thickness gauge, so that the real-time monitoring and closed-loop control of the surface density of the copper foil are realized, the adjustment efficiency and the stable control precision are improved, and the requirement of producing high-standard copper foil can be met.
Description
Technical Field
The invention relates to the field of electrolytic copper foil production processes, in particular to an electrolytic copper foil surface density uniformity online control system and a control method based on the online control system.
Background
Along with the development of new energy industry, the market is vigorous in demand for lithium batteries, an electrolytic copper foil is one of important production materials as a current collector and a negative electrode carrier in the lithium batteries, and along with the improvement of performance requirements such as capacity and light weight of the lithium batteries, thinner electrolytic copper foil is required, the thickness consistency requirement is higher, and the surface density measurement is commonly used in the thickness production of the copper foil.
At present, the production control of the surface density of the copper foil is to test production after the production process parameters are set, take test production samples along the running direction of the cathode roller to measure the surface density of the copper foil, adjust the flow of each liquid distribution pipeline according to the measurement result, take samples again to measure until the surface density of the copper foil reaches the standard, and start formal production. The whole production process is in open loop control, the thickness of the copper foil cannot be monitored and adjusted in real time in the production process, and under the condition that the engineering capacity of equipment is insufficient or equipment abnormality occurs, the problem of batch quality is very easy to occur, and especially when the requirements on the copper foil are higher and higher, the requirements on producing high-standard electrolytic copper foil cannot be met.
Disclosure of Invention
In view of the problems in the prior art, the invention provides an electrolytic copper foil surface density uniformity online control system and a control method based on the online control system.
The technical scheme of the invention is as follows:
an electrolytic copper foil surface density uniformity on-line control system integrated with an electrolytic copper foil producing machine, comprising:
each electromagnetic flow valve in the plurality of electromagnetic flow valves is connected with a plurality of liquid distribution pipelines which are arranged on an anode groove of the foil forming machine side by side along the width direction of a cathode roller of the foil forming machine;
the online thickness gauge is arranged on the advancing route of the copper foil between the cathode roller and the material receiving roller of the foil producing machine and spans the width direction of the copper foil;
a controller electrically connected to the plurality of electromagnetic flow valves, respectively, for controlling the flow rate of each of the plurality of electromagnetic flow valves, respectively;
the system host is in signal connection with the online thickness gauge and the controller, and can send a control instruction to the controller according to the surface density data fed back by the online thickness gauge.
Specifically, the electromagnetic flow valves are all PVC electromagnetic ball valves, and the online thickness gauge uses a laser thickness gauge.
And a control method based on the online control system of the surface density uniformity of the electrolytic copper foil is characterized by comprising the following steps of:
a control limit determining step of taking the specification range [ ρ ] of the copper foil dn ,ρ up ]A subset of the inner as a control limit
And an area density acquisition step, namely controlling the online thickness gauge to perform one-time measurement along the width direction of the copper foil, acquiring the thickness d of the copper foil at the position of the liquid distribution pipeline corresponding to the width direction, and calculating the current value of the area density at the position of the liquid distribution pipeline:
here, n represents the nth measurement process in which the current measurement is the production process, ρ is the density of copper;
a data characteristic calculation step of sequentially calculating the average value of the surface density measurement values of the liquid separation pipeline corresponding to the width direction position to the current measurement processAnd standard deviation s n ；
Engineering capability calculating step, namely calculating the engineering capability of the foil producing machine on the liquid separating pipeline according to the surface density data acquired by the online film thickness meter, and dividing the engineering capability into intervalsWherein->Is the lower limit of ability, < >>Is the upper limit of the capability;
PID control step, the engineering capability of the foil producing machine on the liquid separating pipelineControl limit of copper foil production>Comparison of->For controlling lower limit, ++>In order to control the upper limit of the number of times,
if it is
The PID control is not involved in the process,
if it is
Or->
Then PID control is intervened;
specifically, the data characteristic calculation step is that
For this liquid separation line, the average value of the areal density measurements to the current measurement process is calculated as:
calculating standard deviation s of the areal density measurement of the current measurement process j·n The method comprises the following steps:
wherein T is n To calculate the intermediate quantity, i.e. the variance of the areal density measurement of the current measurement process, the subscript (n-1) indicates the calculation of the corresponding data feature in the last measurement step.
Specifically, the engineering capability calculating step includes:
an initial calculation step of determining the surface density average value of the copper foil with specified thickness produced by the foil producing machine according to the previous production data or trial operation production data or the production data after the last adjustmentAnd standard deviation s cp The lower limit of the capacitySaid upper capacity limit->Interval-> I.e. the engineering capability of the foil producing machine.
Preferably, the engineering capability calculating step further includes:
in-process capability calculation step, calculating the continuous m groups of data after the PID control process starts by a calculation system, wherein each group of data has no requirement on whether the m groups of data are continuous, and calculating the average value of the l data in the groupAnd standard deviation s in-p Calculating the inter-group mean->And standard deviation s cr-pl Said lower capacity limit +.> The upper limit of the capability
Preferably, in the PID control step, the proportional adjustment coefficient K of PID adjustment p According to standard deviation s of production process n Determining that the relation isWherein a, b, K' p According to a predetermined coefficient.
Preferably, the predetermined coefficients a, b satisfyAnd->Wherein (1)>Is s n Maximum value of history>Is s n The minimum value is recorded in the history.
The online control system for the surface density uniformity of the electrolytic copper foil has the following advantages:
1. the thickness of the copper foil is measured through the online thickness gauge, and the electromagnetic flow control valve arranged on the liquid distribution pipeline at the corresponding position is adjusted in a feedback mode according to the measured data of the online thickness gauge, so that closed-loop control is realized, and the control precision can meet the requirement of producing high-standard copper foil.
2. The real-time monitoring and recording of the surface density of the copper foil can be realized through the processing of the system host computer on the measurement data of the online thickness gauge, and references are provided for process monitoring, data analysis and quality improvement.
3. The method has the advantages that the working capacity of the foil forming machine can be mastered in real time, the thickness of the copper foil is controlled in a refined mode through the PID control principle, the control precision is guaranteed, the standard deviation index of the surface density for determining the working capacity is bound with the proportional adjustment coefficient in the PID control, the control parameters can be adjusted according to the stability condition of the foil forming machine before control, the adjustment efficiency is improved, and the driving direction of the adjustment process is accelerated to be stable.
Drawings
FIG. 1 is a schematic view of the installation of the present invention on a foil producing machine;
FIG. 2 is a schematic diagram of an on-line control system according to the present invention;
fig. 3 is a graph of the control process of the present invention.
In the figure:
an anode cell 21; 22 cathode roller; 23 copper foil post-treatment system; 24 a winding system; 25 cathode roll treatment device;
1 an on-line thickness gauge; 2, a system host; 3, a controller; 4, an electromagnetic flow valve;
a P liquid separation pipeline; w copper foil.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments, and in the present specification, the dimensional proportion of the drawings does not represent the actual dimensional proportion, but only represents the relative positional relationship and connection relationship between the components, and the components with the same names or the same reference numerals represent similar or identical structures, and are limited to the schematic purposes.
The online control system for the surface density uniformity of the electrolytic copper foil (hereinafter referred to as online control system) is arranged on an existing electrolytic copper foil production machine and comprises an online thickness gauge 1, a system host 2, a controller 3 and a plurality of electromagnetic flow valves 4 which are respectively arranged on each liquid distribution pipeline P.
Fig. 1 is a schematic system diagram of an on-line control system according to the present invention, and fig. 2 is an installation schematic diagram of the on-line control system according to the present invention. The core device of the electrolytic copper foil producing machine consists of an anode tank 21, a cathode roller 22 and a plurality of groups of liquid separating pipelines P for supplying copper sulfate solution, wherein direct current is applied between the anode plate and the cathode roller to promote copper to be separated out from the copper sulfate solution between the anode plate and the cathode roller and attached to the surface of the cathode roller, the copper foil with separated surface is output through rotation of the cathode roller, in addition, the producing machine is also required to be provided with a copper foil post-processing system 23, a winding system 24 and a cathode roller processing device 25, after the copper foil W is output from the cathode roller, the winding roller can be wound after the copper foil is sequentially subjected to acid washing, drying and passivation of the copper foil post-processing system, and the surface of the cathode roller with the copper foil peeled can enter an electrolytic reaction area again after the surface is polished by the cathode roller processing device 25.
The online thickness gauge is arranged on the advancing path of the copper foil between the cathode roller and the winding roller of the foil producing machine and spans the width direction of the copper foil, and in order to improve the thickness detection precision of the copper foil, the foil producing machine is preferably arranged between the passivation treatment groove and the winding roller in the advancing direction of the copper foil, because the solvent and water stains attached to the surface of the copper foil are removed after the copper foil is subjected to passivation treatment, the oxidation risk does not exist after the surface is passivated, the surface roughness is improved, the evenness is improved, and the measurement precision of laser thickness measurement is improved. According to the invention, 13 liquid inlets are arranged on an anode groove at equal intervals along the width direction of a cathode roller, each liquid inlet is connected with an independent liquid distribution pipeline, each liquid distribution pipeline is provided with an electromagnetic flow valve for controlling the liquid distribution pipeline, each electromagnetic flow valve is uniformly controlled by a controller, a system host is connected with the controller and a thickness gauge through signals, a control signal is sent to the controller by combining with set control parameters through receiving thickness information fed back by the thickness gauge, and the controller adjusts the opening size of each electromagnetic flow valve according to the received control signals, so that the real-time independent control of the flow of the copper sulfate solution entering each liquid inlet pipeline is realized. In some cases, it may be acceptable to integrate the controller and the system host as a single device, subject to field environments or other special requirements.
The on-line thickness gauge of the on-line control system uses a laser thickness gauge, wherein measuring components integrating a laser emitter and a laser receiver are respectively arranged on two sides of the upper surface and the lower surface of a copper foil to be tested, and distances L1 and L2 between the upper surface and the lower surface of the copper foil and the corresponding measuring components are obtained through a laser triangulation method, so that the actual thickness value of the copper foil at the point is as follows:
d＝L-(L1+L2)
here, L is the distance between the upper and lower measuring assemblies.
In the electrolytic copper foil market, electrolytic copper foil is classified into different specifications according to nominal thickness, such as 6 μm copper foil, 8 μm copper foil, copper foil surface density ρ s And the change condition of the surface density are important parameters for measuring the thickness deviation of the electrolytic copper foil with different specifications. Since copper has a density ρ=8.96 g/cm 3 The areal density can be calculated as follows:
ρ s ＝ρ·d
in continuous production, the average value of the surface density of the copper foil under the current measurement process can be used for the integral measurement of the surface density state of the rolled copper foilCharacterization:
for the change of the surface density of the rolled copper foil, the surface density ρ of the whole rolled copper foil under the current measurement process can be used s Is the extremely poor R n Or standard deviation s n Characterization. The calculation formulas are respectively as follows:
wherein:
the maximum value of the surface density of the current measurement process;
the current measurement process surface density minimum value;
the current measurement process surface density average value;
n: a measurement count of a current measurement process;
the surface density value of the i-th measurement;
T n : variance of the current measurement process.
However, the above definition cannot be adopted in the present real-time control system because the above formulas (1) and (2) are both identical to each measurement of the current measurement processIn relation, this means that each time measurement data is added, the above equations (1) and (2) need to be recalculated, and the data required for calculation includes all measurement data from the first measurement to the current nth measurement. In the continuous measurement, the data amount increases as the measurement progresses, and the calculation load using the above equations (1) and (2) is not acceptable.
It is desirable that the device can use the result of the last calculation at each measurement data update to significantly reduce the amount of calculation, and for this purpose, the recursive formulas of the formulas (1) and (2) are needed to be derived and used:
according to the recursive formulas of (4) and (5), the average value of the calculation results from the n-1 st measurement processVariance T n-1 Calculating the mean +.>Variance T n And further according to the variance T n Calculate standard deviation S n 。
In the online control system, the data of the online thickness gauge are calculated according to the formulas (4) and (5), and the mean value is calculatedVariance s n The current value of the foil machine and the change curve of continuous repeated measurement are displayed on a display screen of a system host computer, so that operators can confirm the working state of the foil machine at any time, and the surface density quality of the rolled copper foil is monitored. Meanwhile, the calculation result is also used for confirming the production state of the system, and confirming the engineering capability of the system under normal operation, namely the capability of producing the electrolytic copper foil meeting the specification requirements, and the method is concretely described later.
The on-line control system obtains the surface density data measured by the on-line thickness gauge at the position of each liquid distribution pipeline in the width direction of the copper foil, and after the data are processed, the electromagnetic flow valve arranged on the corresponding liquid distribution pipeline is controlled in a feedback manner, so that the stability of the surface density data in production is ensured, and the on-line control of the surface density of the copper foil is realized. The online control system provides a traditional PID control scheme based on single measurement data and a PID control scheme based on statistical information.
In a conventional PID control scheme based on single measurement data, areal density continuous measurement data of the corresponding same liquid separation tube measured by a laser thickness gaugeThe subscript j represents the ordinal number of the liquid separating pipeline, the subscript i represents the ordinal number of the measuring times, the subscript i is used as an input parameter of the PID controller after being filtered, the opening increment of the output valve is output, and the control algorithm can be represented as the following formula.
Here, k-1, k are the number of measurement times, j is the corresponding number of liquid separation pipelines;
φ k to be according to output deviationCalculated control increment, where K p ，K i ，K d The PID adjustment coefficients are calibrated in advance, and T is the time step;
Φ k+1 for the opening degree of the electromagnetic flow valve corresponding to the next time of instruction output, phi k The opening degree of the corresponding electromagnetic flow valve is the current opening degree;
surface Density measurement value +.A.of the corresponding position of the jth liquid separation pipeline is shown at the kth time>And control the limit bitThe control limit is set as a subset of the product specification range, wherein the lower control limit is +.>The upper control limit is +.>For the strict control of the inside of factories, in particular, if the specified copper foil has a quality standard requiring a specification range of [ ρ ] dn ,ρ up ]Wherein the specification lower limit is ρ dn The upper limit of the specification is ρ up Then the following should be satisfied:
in practice, in order to produce an electrolytic copper foil of 8 μm specification, the copper foil specification limit is [70,74]g/cm 2 When internal control is performed, the method is carried out by [70.5,73.5 ]]g/cm 2 As a control limit, a control limit bit
In the PID control scheme based on the statistical information, the following control method is simultaneously provided corresponding to the online control system:
firstly, determining engineering capability of a foil producing machine, specifically determining the surface density average value of the foil producing machine for producing specified copper foil according to the previous production data or test operation production data or production data after the last adjustmentAnd standard deviation s cp On the premise of 99.7% confidence, it is considered that the copper foil produced by the foil producing machine will be stabilized at +.>Within the interval of (2), wherein the lower capacity limit +.>Upper capacity limit-> Interval->I.e. the engineering capability of the foil producing machine.
Then in order to ensure that the produced copper foil meets the internal quality control requirements, the engineering capability of the foil producing machine is required to be within the control limit range, namely
At the moment, the foil producing machine is stable in the control limit, copper foils meeting the internal quality control requirements can be produced in batches, and PID feedback control is not involved; while
Or->
At the moment, the control limit and the engineering capability are described to have deviation, and the foil producing machine has certain probability to produce the copper foil which does not meet the internal quality control requirement, and PID regulation control is needed to be intervened, so that the foil producing engineering capability is returned to the control limit.
Importantly, at this time, in order to improve the efficiency of PID regulation control, the regulation process is quickly brought to a stable state, and the proportion regulation coefficient K in the PID regulation algorithm is regulated p The method is characterized in that the method is properly adjusted according to the actual condition of engineering capacity, namely, the set adjustment coefficient is modified by the real-time statistical information of an application system, and in the control system, the proportional adjustment coefficient is set to be linearly changed according to the standard deviation of the actual engineering capacity, namely
Wherein a, b, K' p Based on a priori analysis of historical data of the foil machine, an alternative analysis process is to take a, b s respectively n Within a value interval formed by the minimum value and the maximum value of the history record, namely The scaling factor is adjusted within the system variation range according to the magnitude of the system deviation from steady state, i.e. s n Characterization, adjustment of the scaling factor K' p Is realized.
Fig. 3 shows control curves plotted according to the foil production process for several examples below and for a conventional PID control example based on single measurement data. Wherein:
example 1 is, K' p ＝-0.72，a＝0.0，b＝2.0，
In the case of the embodiment 2 of the present invention,K′ p ＝-0.72，a＝0.5，b＝1.5，
example 3 is, K' p ＝-0.72，a＝1.0，b＝2.0。
In the PID feedback control process, the system calculates m groups of data after the control process is started, and calculates the average value of the data in each groupAnd standard deviation s in-pl Calculating the inter-group mean->And standard deviation s cr-p It is possible to estimate the engineering capacity after control as +.>Wherein-> The engineering capability is used as the engineering capability for controlling the foil producing machine, and the judgment process is continued to confirm whether the next round of control process is performed. In order to make the sample representative, it can represent the surface density distribution of the copper foil produced by the foil producing machine, and it is required that l is not less than 5 and m is not less than 5. Specifically, in order to give consideration to sampling efficiency, the control system obtains a control conclusion as soon as possible, and takes l=5 and m=7.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and various modifications and improvements made by those skilled in the art to which the invention pertains will fall within the scope of the invention as defined by the appended claims without departing from the spirit of the invention.
Claims (7)
1. An electrolytic copper foil surface density uniformity on-line control system integrated with an electrolytic copper foil producing machine, comprising:
each electromagnetic flow valve in the plurality of electromagnetic flow valves is connected with a plurality of liquid distribution pipelines which are arranged on an anode groove of the foil forming machine side by side along the width direction of a cathode roller of the foil forming machine;
the online thickness gauge is arranged on the advancing route of the copper foil between the cathode roller and the material receiving roller of the foil producing machine and spans the width direction of the copper foil;
a controller electrically connected to the plurality of electromagnetic flow valves, respectively, for controlling the flow rate of each of the plurality of electromagnetic flow valves, respectively;
the system host is in signal connection with the online thickness gauge and the controller and can send a control instruction to the controller according to the surface density data fed back by the online thickness gauge; the electromagnetic flow valves are all PVC electromagnetic ball valves, and the online thickness gauge uses a laser thickness gauge;
the method for sending a control instruction to the controller according to the surface density data fed back by the online thickness gauge comprises the following steps of:
a control limit determining step of taking the specification range [ ρ ] of the copper foil dn ,ρ up ]A subset of the inner as a control limitWherein the method comprises the steps ofFor controlling lower limit, ++>Is the upper control limit;
and an area density acquisition step, namely controlling the online thickness gauge to perform one-time measurement along the width direction of the copper foil, acquiring the thickness d of the copper foil at the position of the liquid distribution pipeline corresponding to the width direction, and calculating the current value of the area density at the position of the liquid distribution pipeline:
wherein n represents the nth measurement process of the production process, and ρ is the density of copper;
a data characteristic calculation step of sequentially calculating the average value of the surface density measurement values of the liquid separation pipeline corresponding to the width direction position to the current measurement processAnd standard deviation s n ；
Engineering capability calculating step, namely calculating the engineering capability of the foil producing machine on the liquid separating pipeline according to the surface density data acquired by the online film thickness meter, and dividing the engineering capability into intervalsRepresentation of->Is the lower limit of ability, < >>Is the upper limit of the capability;
PID control step, the engineering capability of the foil producing machine on the liquid separating pipelineControl limit for copper foil productionComparing, if
Not intervening PID control, if
Or->
PID control is interposed.
2. A control method based on the electrolytic copper foil surface density uniformity on-line control system according to claim 1, characterized by comprising, for each liquid-dividing pipe:
a control limit determining step of taking the specification range [ ρ ] of the copper foil dn ,ρ up ]A subset of the inner as a control limitWherein the method comprises the steps ofFor controlling lower limit, ++>Is the upper control limit;
and an area density acquisition step, namely controlling the online thickness gauge to perform one-time measurement along the width direction of the copper foil, acquiring the thickness d of the copper foil at the position of the liquid distribution pipeline corresponding to the width direction, and calculating the current value of the area density at the position of the liquid distribution pipeline:
wherein n represents the nth measurement process of the production process, and ρ is the density of copper;
a data characteristic calculation step of sequentially calculating the average value of the surface density measurement values of the liquid separation pipeline corresponding to the width direction position to the current measurement processAnd standard deviation s n ；
Engineering capability calculating step, namely calculating the engineering capability of the foil producing machine on the liquid separating pipeline according to the surface density data acquired by the online film thickness meter, and dividing the engineering capability into intervalsRepresentation of->Is the lower limit of ability, < >>Is the upper limit of the capability;
PID control step, the engineering capability of the foil producing machine on the liquid separating pipelineControl limit for copper foil productionComparing, if
Not intervening PID control, if
Or->
PID control is interposed.
3. The control method of the electrolytic copper foil surface density uniformity on-line control system according to claim 2, wherein the data characteristic calculation step is:
for this liquid separation line, the average value of the areal density measurements to the current measurement process is calculated as:
calculating standard deviation s of the areal density measurement of the current measurement process j·n The method comprises the following steps:
wherein T is n To calculate the intermediate quantity, i.e. the variance of the areal density measurement of the current measurement process, the subscript (n-1) indicates the calculation of the corresponding data feature in the last measurement step.
4. The method for controlling the on-line control system for the surface density uniformity of an electrolytic copper foil according to claim 2, wherein said engineering capability calculating step comprises:
an initial calculation step of determining the surface density average value of the copper foil with specified thickness produced by the foil producing machine according to the previous production data or trial operation production data or the production data after the last adjustmentAnd standard deviation s cp The lower limit of the capacitySaid upper capacity limit->Interval->I.e. the engineering capability of the foil producing machine.
5. The method for controlling an electrolytic copper foil surface density uniformity on-line control system according to claim 2, wherein said engineering capability calculating step further comprises:
in the capacity calculation step in the process, the calculation system calculates continuous m groups of I data after the PID control process is started, wherein I is more than or equal to 5, m is more than or equal to 5, and the average value of the I data in the groups is calculatedAnd standard deviation s in-pl Calculating the inter-group mean->And standard deviation s cr-pl Said lower capacity limit +.>Said upper capacity limit->
6. The method for controlling an on-line control system for the surface density uniformity of an electrolytic copper foil according to claim 2, wherein in said PID control step, a proportional control coefficient K is PID-adjusted p According to the standard deviation s of the production process of the liquid separation pipeline n Determining that the relation isWherein a, b, K p ′ Is a preset coefficient.
7. The method for controlling an on-line control system for the surface density uniformity of an electrodeposited copper foil according to claim 6, wherein said coefficients a, b satisfyAnd->Wherein (1)>Is s n Maximum value of history>Is s n The minimum value is recorded in the history.
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| JPH04221093A (en) * | 1990-12-19 | 1992-08-11 | Nikko Guurudo Foil Kk | Method and device for producing electrolytic copper foil |
| CN109652826A (en) * | 2019-02-22 | 2019-04-19 | 圣达电气有限公司 | The electrolytic copper foil the thickness uniformity control method of cathode roll |
| CN112903009A (en) * | 2021-01-15 | 2021-06-04 | 广东嘉元科技股份有限公司 | Online monitoring system of crude foil machine |
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|---|---|---|---|---|
| JPH04221093A (en) * | 1990-12-19 | 1992-08-11 | Nikko Guurudo Foil Kk | Method and device for producing electrolytic copper foil |
| CN109652826A (en) * | 2019-02-22 | 2019-04-19 | 圣达电气有限公司 | The electrolytic copper foil the thickness uniformity control method of cathode roll |
| CN112903009A (en) * | 2021-01-15 | 2021-06-04 | 广东嘉元科技股份有限公司 | Online monitoring system of crude foil machine |
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