CN111580473A - Method for automatically controlling glass extraction amount of liquid crystal substrate - Google Patents

Method for automatically controlling glass extraction amount of liquid crystal substrate Download PDF

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CN111580473A
CN111580473A CN202010281304.5A CN202010281304A CN111580473A CN 111580473 A CN111580473 A CN 111580473A CN 202010281304 A CN202010281304 A CN 202010281304A CN 111580473 A CN111580473 A CN 111580473A
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lead
value
opeu
counter
amount
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CN111580473B (en
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李新
吴嘉宜
张纪魁
王小军
邢波
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Caihong Group Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/41875—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by quality surveillance of production
    • 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)
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  • Feedback Control In General (AREA)

Abstract

The invention relates to a method for automatically controlling the glass output of a liquid crystal substrate, which comprises the steps of establishing a scientific and reasonable mathematical model through directly-acquired information such as plate weight, traction rolling line speed, plate length and the like, then carrying out program configuration by using a DCS (distributed control system) lower design configuration tool according to the established mathematical model, linking corresponding data items through an upper design flow chart picture, and realizing online real-time adjustment of control parameters at an upper computer operating station to achieve the purpose of real-time automatic control; the weight, the extraction amount, the average value of the extraction amount, the traction rolling line speed, the extraction amount PID controller feedback value PV, the output value OPEU and the temperature control loop SP can be monitored on line in real time at an upper computer operating stationiAnd the like, displaying the information in a more understandable mode such as imaging, performing necessary analysis processing and storage on the information, and sending a control command. The risk of an automatic control system can be reduced, and the production operation efficiency is improved.

Description

Method for automatically controlling glass extraction amount of liquid crystal substrate
Technical Field
The invention relates to the technical field of automatic control, in particular to a method for automatically controlling the glass extraction amount of a liquid crystal substrate.
Background
A distributed control system, DCS for short, is a new generation of instrument control system based on a microprocessor and adopting a design principle of decentralized control function, centralized display operation and consideration of both autonomous and comprehensive coordination. The real-time lead-out quantity control function generally comprises the steps of sending a 4-20 milliampere board weight signal generated by measurement of an intelligent instrument and a traction rolling line speed into a DCS, establishing a corresponding model in the DCS at the DCS functional configuration stage, automatically controlling the set values of a PID (proportion integration differentiation) controller according to the discontinuous feedback value of the average value of effective data groups of lead-out quantity at an unfixed time interval and the temperature of each heating loop of a channel cold section and a feeding tank influencing the change of the lead-out quantity through the PID controller, and further automatically controlling the current of each heating loop through the PID controller according to the continuous temperature feedback value of each heating loop, so that the real-time automatic control of the lead-out quantity is realized.
In the conventional production line of liquid crystal substrate glass, in the melting → channel → molding → BOD process, firstly, the BOD process plate weight information lags behind the heating circuits of the channel cooling stage and the feed tank which directly affect the variation of the drawing amount for more than ten minutes; secondly, although the BOD process measures the weight of each board, the measurement period is far longer than the execution period of the DCS CM; meanwhile, in order to eliminate weighing errors and weighing distortion caused by quality fluctuation of a BOD process, the extraction quantity information obtained by calculating discontinuous board weight information of the DCS needs to be passivated, effectively filtered and averaged, so that an effective data average value with an unfixed time interval is formed. The extraction amount control is the most important control parameter in the overflow glass manufacturing process, and the stability of the extraction amount directly determines the stability of the glass plate weight of the liquid crystal substrate. The automatic control of the extraction amount can eliminate quality fluctuation caused by artificial subjective factors, and the fluctuation range of the extraction amount is reduced and the consistency of the product quality is improved by searching and standardizing corresponding parameters through the process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for automatically controlling the lead-out quantity of liquid crystal substrate glass.
The invention is realized by the following technical scheme:
a method for automatically controlling the glass lead-out quantity of a liquid crystal substrate is based on a DCS system and comprises the following steps,
step 1, setting an execution period t of a control module CM in a DCS system0The lead-out amount data group is an effective data number target value N taken by the effective data group, the lead-out amount data group is an invalid data number target value M of the invalid data group, the lead-out amount automatic control continuous invalid data group number target value is L and a lead-out amount effective value judgment upper and lower limits; the initial value of each counter in the system is 0;
increasing the plate weight bz, the traction rolling linear speed xsd, the lead-out quantity ycl and the lead-out quantity data group effective data average value ycla into standard historical data acquisition items;
step 2, collecting the plate weight bz, the traction rolling line speed xsd and the plate length information bc of the current production specification;
step 3, calculating the drawn-out quantity ycl and a target value T of measuring time interval counting of two continuous glass plates according to the following formula;
measurement interval count target value T ═ board length bc ÷ traction roll line speed xsd ÷ T0；
The draw-off amount ycl ═ 3600 (sec) ÷ (board length bc ÷ traction rolling line speed xsd) × (board weight);
step 4, collecting numerical information of a time interval counter T, and executing step 5 if the time interval counter T is equal to a time counting target value T;
if the time interval counter T is not equal to the time counting target value T, the time counter T is made to be T +1, and the step 4 is executed;
step 5, taking the extraction amount as a latest extraction amount signal ycl, and recovering the initial value 0 by the time counter t;
step 6, making the forced manual signal qz be OFF;
step 7, judging the latest lead-out quantity in the step 5 according to the upper limit and the lower limit of the effective value, and executing step 8, wherein the lead-out quantity falling in the range is the effective value; if the range is not an invalid value, executing step 10;
step 8, if the valid data counter yc is equal to 0, the process value yclg of the mean value of the valid data of the lead-out amount data set is ycl/N, and yclg is stored; if the valid data counter yc ≠ 0, executing step 9;
step 9, if the valid data counter yc is not equal to N-1, making yc equal to yc +1, and storing the lead-out amount data set valid data average value yclg equal to yclg + ycl/N; the extraction amount PID arithmetic unit receives the external OPEU instruction wb to be ON, and executes the step 6;
if the valid data counter yc is N-1, the extraction amount data set average value yca is yclg + ycl/N, the extraction amount PID operator receives the external OPEU command wb is OFF, and sets the valid data counter yc to 0, the invalid data counter wc to 0, and the invalid data set counter wsc to 0, and executes step 13;
step 10, the derived quantity PID operator receives an external OPEU command wb ═ ON;
step 11, if the invalid data counter wc ≠ M-1, making wc ═ wc +1, executing step 6;
if the invalid data counter wc is equal to M-1, making the valid data counter yc equal to 0 and the invalid data counter wc equal to 0, and executing step 12;
step 12, if the invalid dataset counter wsc ≠ L-1, making wsc ≠ wsc +1, executing step 6;
if the invalid data set counter wsc is equal to L-1, making wsc equal to 0, forcing a manual signal qz to be ON, sending the signal to a lead-out quantity PID controller to force to be in a manual mode, and simultaneously sending the signal to a voice alarm system to prompt that the manual mode is forced to be changed;
step 13, adding set values SP, feedback values PV and output values OPEU of the led-out PID controllers and the temperature PID controllers as standard historical data acquisition items; setting a set value SP of a lead-out quantity PID controller; the extraction amount PID controller calculates an output value OPEU according to the average value ycla of the latest extraction amount data set as a feedback value of an extraction amount PID actuator PV;
before the average value yca of the lead-out quantity data set is output for the first time, the lead-out quantity PID controller is in a manual mode; let wb be ON, the extraction amount PID controller receives external OPEU, and the undisturbed switching from temperature control to extraction amount control is realized; the drawn-out external OPEU is calculated by the following formula:
external OPEU ═ AVG | (sp)i)；
After the average value yca of the lead-out quantity data set is output for the first time, the lead-out quantity PID controller is in an automatic mode; when a new extraction amount data set average value ycla is generated, namely when continuous M + N-1 extraction amounts can acquire enough N effective data, wb is OFF, the extraction amount PID controller calculates according to the latest extraction amount data set average value ycla as an extraction amount PID actuator PV feedback value, and outputs a value OPEU; during the period when the new yca is not generated, wb is ON, and the pulled amount PID controller receives the external OPEU, i.e., the output value OPEU of the pulled amount PID controller remains unchanged;
step 14, calculating the output value OPEU of the extraction PID controller according to the following formula, and then transmitting the signal to each heating loop temperature control PID controller temperature set value SP which directly influences the extraction change of the channeli；
SPi＝ki× derived quantity PID controller OPEU + deltai
Wherein k isiControlling the activity of each temperature control loop according to the geometric parameters; deltaiControlling the activity equal difference parameters of the loops for each temperature;
each temperature control loop feeds back the temperature PV according to the continuous correspondenceiOutputting continuous instruction OPEU through PID controller operation corresponding to temperatureiAnd the temperature control signals are transmitted to an electrical control cabinet to realize the temperature control of the areas controlled by the heating loops of the channels and the real-time automatic control of the output quantity.
Preferably, the traction rolling speed xsd is according to the execution period t of CM0And (6) displaying.
Preferably, the panel weight bz, the amount of extraction ycl are in accordance with the time interval t0× T.
Preferably, the time count target value T is set in accordance with the following principle: time interval t0× T is an integer multiple of a standard historical data acquisition time interval.
Preferably, the average value yca of the effective data of the lead-out amount data group is displayed according to the lead-out amount data group at an unfixed time interval at which N effective data can be acquired at continuous M + N-1 lead-out amounts.
Preferably, the degree of passivation of the derived quantity PID controller is adjusted by adjusting the values of M and N.
Preferably, in step 14, the SP is set or calculatedi、ki、ΔiAnd adjusting the activity of each heating loop of the cooling section of the channel and the feeding groove in the adjustment of the lead-out amount.
Preferably, k is determined according to the following principleiAnd ΔiSetting or calculating;
when the geometric relation is adopted, the ratio of the two components is determined,
setting of deltai＝0，ki＝SPiExtracted quantity PID controller OPEU;
when the relation of equal difference is adopted,
setting ki＝1，Δi＝SPi-a derived quantity PID controller OPEU.
Compared with the prior art, the invention has the following beneficial technical effects:
the method for automatically controlling the glass lead-out amount of the liquid crystal substrate establishes a scientific and reasonable mathematical model through directly-acquired information such as plate weight, traction rolling line speed, plate length and the like, then utilizes a DCS (distributed control System) lower design configuration tool to carry out program configuration according to the established mathematical model, links corresponding data items through an upper design flow chart picture, and realizes that an upper computer operation station can online adjust a control parameter invalid data quantity target value M, an effective data quantity target value N, a continuous invalid data group quantity target value L and activity parameters k of various temperature control loops in real timeiOr ΔiThe parameters of the led-out quantity PID controller are compared with the integration time, the differential time and the like, so that the aim of real-time automatic control of the process requirement is fulfilled; in addition, the upper computer operating station can monitor the plate weight, the drawing amount, the average drawing amount, the drawing rolling speed, the feedback value PV of the drawing amount PID controller, the output value OPEU and the temperature control loop SP on line in real timeiWaiting for important quality parameters, and imaging the informationAnd the like are displayed in a more easily understood manner, important information is transmitted to relevant personnel through various means, necessary analysis processing and storage are carried out on the information, and a control command is sent out. The invention can reduce the risk of the automatic control system and improve the production operation efficiency.
Drawings
FIG. 1 is a flow chart of the DCS system for obtaining the lead-out quantity;
FIG. 2 is a flow chart of the DCS system lead-out quantity automatic control of the invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Referring to fig. 1 and 2, which are flowcharts of the DCS system of the present invention, a method for automatically controlling the drawn-out amount of liquid crystal substrate glass, based on the DCS system, includes the following steps,
step 1, setting an execution period t of a control module CM in a DCS system0The lead-out amount data group is an effective data number target value N taken by the effective data group, the lead-out amount data group is an invalid data number target value M of the invalid data group, the lead-out amount automatic control continuous invalid data group number target value is L and a lead-out amount effective value judgment upper and lower limits; the initial value of each counter in the system is 0;
increasing the plate weight bz, the traction rolling linear speed xsd, the lead-out quantity ycl and the lead-out quantity data group effective data average value ycla into standard historical data acquisition items;
step 2, collecting the plate weight bz, the traction rolling line speed xsd and the plate length information bc of the current production specification;
step 3, calculating the extraction amount ycl and a measurement time interval counting target value T according to the following formula;
measurement interval count target value T ═ board length bc ÷ traction roll line speed xsd ÷ T0；
The draw-off amount ycl ═ 3600 (sec) ÷ (board length bc ÷ traction rolling line speed xsd) × (board weight);
step 4, collecting numerical information of a time interval counter T, and executing step 5 if the time interval counter T is equal to a time counting target value T;
if the time interval counter T is not equal to the time counting target value T, the time counter T is made to be T +1, and the step 4 is executed;
step 5, taking the extraction amount as a latest extraction amount signal ycl, and recovering the initial value 0 by the time counter t;
step 6, making the forced manual signal qz be OFF;
step 7, judging the latest lead-out quantity in the step 5 according to the upper limit and the lower limit of the effective value, and executing step 8, wherein the lead-out quantity falling in the range is the effective value; if the range is not an invalid value, executing step 10;
step 8, if the valid data counter yc is equal to 0, the process value yclg of the mean value of the valid data of the lead-out amount data set is ycl/N, and yclg is stored; if the valid data counter yc ≠ 0, executing step 9;
step 9, if the valid data counter yc is not equal to N-1, making yc equal to yc +1, and storing the lead-out amount data set valid data average value yclg equal to yclg + ycl/N; the extraction amount PID arithmetic unit receives the external OPEU instruction wb to be ON, and executes the step 6;
if the valid data counter yc is N-1, the extraction amount data set average value yca is yclg + ycl/N, the extraction amount PID operator receives the external OPEU command wb is OFF, and sets the valid data counter yc to 0, the invalid data counter wc to 0, and the invalid data set counter wsc to 0, and executes step 13;
step 10, the derived quantity PID operator receives an external OPEU command wb ═ ON;
step 11, if the invalid data counter wc ≠ M-1, making wc ═ wc +1, executing step 6;
if the invalid data counter wc is equal to M-1, making the valid data counter yc equal to 0 and the invalid data counter wc equal to 0, and executing step 12;
step 12, if the invalid dataset counter wsc ≠ L-1, making wsc ≠ wsc +1, executing step 6;
if the invalid data set counter wsc is equal to L-1, making wsc equal to 0, forcing a manual signal qz to be ON, sending the signal to a lead-out quantity PID controller to force to be in a manual mode, and simultaneously sending the signal to a voice alarm system to prompt that the manual mode is forced to be changed;
step 13, adding set values SP, feedback values PV and output values OPEU of the led-out PID controllers and the temperature PID controllers as standard historical data acquisition items; setting a set value SP of a lead-out quantity PID controller;
the extraction amount PID controller calculates an output value OPEU according to the average value ycla of the latest extraction amount data set as a feedback value of an extraction amount PID actuator PV;
before the average value yca of the lead-out quantity data set is output for the first time, the lead-out quantity PID controller is in a manual mode; let wb be ON, the extraction amount PID controller receives external OPEU, and the undisturbed switching from temperature control to extraction amount control is realized;
the drawn-out external OPEU is calculated by the following formula:
external OPEU ═ AVG | (sp)i)；
After the average value ycla of the lead-out quantity data set is output for the first time, the lead-out quantity PID controller is in an automatic mode, when a new average value ycla of the lead-out quantity data set is generated, namely when continuous M + N-1 lead-out quantities can collect enough N effective data, wb is OFF, the lead-out quantity PID controller calculates according to the average value ycla of the latest lead-out quantity data set as a feedback value of a lead-out quantity PID actuator PV, and a value OPEU is output; during the period when the new yca is not generated, wb is ON, and the pulled amount PID controller receives the external OPEU, i.e., the output value OPEU of the pulled amount PID controller remains unchanged;
step 14, calculating the output value OPEU of the extraction PID controller according to the following formula, and then transmitting the signal to each heating loop temperature control PID controller temperature set value SP which directly influences the extraction change of the channeli；
SPi＝ki× derived quantity PID controller OPEU + deltai
Wherein k isiControlling the activity of each temperature control loop according to the geometric parameters; deltaiControlling the activity equal difference parameters of the loops for each temperature;
each temperature control loop feeds back the temperature PV according to the continuous correspondenceiOutputting continuous instruction OPEU through PID controller operation corresponding to temperatureiIs delivered to an electrical control cabinet to realize the addition of the channelsTemperature control of the zone controlled by the thermal loop, and real-time automatic control of the eduction.
Example 1
Step 1, setting an execution period t of a control module CM in a DCS according to actual production experience0And the target value of the number of valid data taken by the lead-out amount data group as a valid data group is N, the target value of the number of invalid data taking the lead-out amount data group as an invalid data group is M, and the target value of the number of lead-out amount automatic control continuous invalid data groups is L;
defining the target value of the counting of the measuring time interval of two continuous glass plates in the subsequent procedure as T; the measurement time interval counter is t, the effective data counter is yc, the invalid data counter is wc, the invalid data group counter is wsc, the plate weight bz, the traction rolling linear speed xsd, the lead-out quantity ycl and the lead-out quantity data group effective data average value ycla are increased to be standard historical data acquisition items, and data recording is carried out; upper and lower judgment limits for effective lead-out value are set, and the initial value of each counter is 0 (i.e., t is 0, yc is 0, wc is 0, and wsc is 0).
Step 2, collecting the plate weight bz through a weighing system, collecting the traction rolling linear speed xsd through the rotating speed of a servo motor, and inputting the plate length information bc of the current production specification;
step 3, calculating a drawing amount ycl and a measurement time interval counting target value T according to the formulas (1) to (2);
measurement interval count target value T ═ board length bc ÷ traction roll line speed xsd ÷ T0(1)
The draw-off amount ycl ═ 3600 (sec) ÷ (board length bc ÷ traction rolling line speed xsd) × (2) board weight
Step 4, collecting numerical information of a time interval counter T, and executing step 5 if the time interval counter T is equal to a time counting target value T; if the time interval counter T is not equal to the time counting target value T, the time counter T is made to be T +1, and the step 4 is executed;
in this step, to prevent data distortion, the time count target value T is set in accordance with the following principle:
time interval t0× T is an integer multiple of a standard historical data acquisition time interval.
Step 5, taking the extraction amount as a latest extraction amount signal ycl, and recovering the initial value 0 by the time counter t;
step 6, making the forced manual signal qz be OFF;
step 7, judging the latest lead-out quantity in the step 5 according to the upper limit and the lower limit of the effective value, and executing step 8, wherein the lead-out quantity falling in the range is the effective value; if the range is not an invalid value, executing step 10;
step 8, if the effective data counter yc is equal to 0, calculating an average process value yclg of effective data of the derived quantity data set, wherein the average process value yclg is ycl/N, and storing yclg; if the valid data counter yc ≠ 0, executing step 9;
step 9, if the valid data counter yc is not equal to N-1, making yc equal to yc +1, making the average value yclg equal to yclg + ycl/N of valid data of the drawn amount data group, receiving an external OPEU instruction wb equal to ON by the drawn amount PID arithmetic unit, and executing step 6;
if the valid data counter yc is N-1, the average value ycla of the derived amount data set is yclg + ycl/N (as the feedback value of the derived amount PID actuator PV), the derived amount PID operator receives the external OPEU command wb is OFF, and makes the valid data counter yc 0, the invalid data counter wc 0 and the invalid data set counter wsc 0, and executes step 13;
step 10, the derived quantity PID operator receives an external OPEU command wb ═ ON;
step 11, if the invalid data counter wc ≠ M-1, making wc ═ wc +1, executing step 6;
if the invalid data counter wc is equal to M-1, making the valid data counter yc equal to 0 and the invalid data counter wc equal to 0, and executing step 12;
step 12, if the invalid dataset counter wsc ≠ L-1, making wsc ≠ wsc +1, executing step 6;
if invalid data set counter wsc is L-1, wsc is 0, force manual signal qz is ON, and send the signal to export PID controller to force manual mode, and at the same time send voice alarm system to prompt forced manual mode.
Step 13, adding set values SP, feedback values PV and output values OPEU of the led-out PID controllers and the temperature PID controllers as standard historical data acquisition items; setting a set value SP of a lead-out quantity PID controller; the derived quantity PID controller can select automatic and manual modes; the drawn-out external OPEU is calculated by the following formula:
external OPEU ═ AVG | (sp)i)
The extraction amount PID controller calculates according to the average value yca of the latest extraction amount data set as a feedback PV value and outputs a value OPEU;
in an automatic mode, the extraction amount PID controller calculates a value OPEU according to the average value yca of the latest extraction amount data set as a feedback PV value only when a new extraction amount data set average value yca is generated, namely when N effective data can be collected by continuous M + N-1 extraction amounts, wherein wb is OFF; during the period when the new yca is not generated, wb is ON, and the pulled amount PID controller receives the external OPEU, i.e., the output value OPEU of the pulled amount PID controller remains unchanged;
the extraction amount PID controller turns wb to ON in a manual mode, receives external OPEU and realizes undisturbed switching from temperature control to extraction amount control;
step 14, outputting an instruction OPEU by the extraction quantity PID controller, calculating a signal according to the following formula, and then transmitting the signal to each heating loop temperature control PID controller temperature set value SP which directly influences the extraction quantity change of the channeli：
SPi＝ki× derived quantity PID controller OPEU + deltai
Wherein k isiControlling the activity of each temperature control loop according to the geometric parameters; deltaiControlling the activity equal difference parameters of the loops for each temperature;
each temperature control loop feeds back the temperature PV according to the continuous correspondenceiOutputting continuous instruction OPEU through PID controller operation corresponding to temperatureiThe primary current is transmitted to an electrical control cabinet to realize the temperature of the area controlled by each heating loop of the channel; and automatically controlling the extraction amount in real time according to the process requirements.
K when each heating circuit of the channel is switched from the temperature control mode to the extraction amount automatic control modei，ΔiThe process is controlled according to various temperaturesThe loop making activity is set or calculated according to the following principle:
when the geometric relation is adopted, the ratio of the two components is determined,
setting of deltai＝0，ki＝SPiExtracted quantity PID controller OPEU;
when the relation of equal difference is adopted,
setting ki＝1，Δi＝SPi-a derived quantity PID controller OPEU;
setting the traction rolling linear speed xsd according to the execution period t of the CM for convenient real-time monitoring0Display, board weight bz and draw-off amount in time interval t0× T shows that the lead amount data group valid data average value yca is displayed at an unfixed time interval at which N valid data can be collected at consecutive M + N-1 lead amounts according to the lead amount data group.
The derived quantity PID controller output command OPEU principle follows: new OPEU instructions can be generated when continuous M + N-1 lead-out amounts can be collected for N valid data time intervals according to the PV (i.e. lead-out amount data set valid data average value yca) fed back discontinuously, otherwise, the OPEU remains unchanged.
And adjusting the passivation degree of the derived quantity PID controller by adjusting M and N so as to meet the requirement of adjusting the passivation degree by the process requirement.
In step 14, the activity of the SPi, ki and Δ i adjusting channel cooling section and each heating loop of the feed tank in the extraction amount adjustment is set or calculated to meet the process requirements.
The method has the advantages that information such as standard historical data acquisition items and the like is displayed in a graphical mode and the like, important information is transmitted to related personnel in various ways, important quality parameters such as the weight, the extraction amount, the average value of the extraction amount, the traction rolling line speed, the extraction amount PID controller feedback value PV, the output value OPEU, the temperature control loop SPi and the like can be monitored on line in real time at an upper computer operation station, necessary analysis processing and storage are carried out on the information, a control instruction is sent out, the risk of an automatic control system is reduced, and the production running efficiency is improved.

Claims (8)

1. A method for automatically controlling the glass lead-out quantity of a liquid crystal substrate is characterized by comprising the following steps based on a DCS system,
step 1, setting an execution period t of a control module CM in a DCS system0The lead-out amount data group is an effective data number target value N taken by the effective data group, the lead-out amount data group is an invalid data number target value M of the invalid data group, the lead-out amount automatic control continuous invalid data group number target value is L and a lead-out amount effective value judgment upper and lower limits; the initial value of each counter in the system is 0;
increasing the plate weight bz, the traction rolling linear speed xsd, the lead-out quantity ycl and the lead-out quantity data group effective data average value ycla into standard historical data acquisition items;
step 2, collecting the plate weight bz, the traction rolling line speed xsd and the plate length information bc of the current production specification;
step 3, calculating the drawn-out quantity ycl and a target value T of measuring time interval counting of two continuous glass plates according to the following formula;
measurement interval count target value T ═ board length bc ÷ traction roll line speed xsd ÷ T0；
The draw-off amount ycl ═ 3600 (sec) ÷ (board length bc ÷ traction rolling line speed xsd) × (board weight);
step 4, collecting numerical information of a time interval counter T, and executing step 5 if the time interval counter T is equal to a time counting target value T;
if the time interval counter T is not equal to the time counting target value T, the time counter T is made to be T +1, and the step 4 is executed;
step 5, taking the extraction amount as a latest extraction amount signal ycl, and recovering the initial value 0 by the time counter t;
step 6, making the forced manual signal qz be OFF;
step 7, judging the latest lead-out quantity in the step 5 according to the upper limit and the lower limit of the effective value, and executing step 8, wherein the lead-out quantity falling in the range is the effective value; if the range is not an invalid value, executing step 10;
step 8, if the valid data counter yc is equal to 0, the process value yclg of the mean value of the valid data of the lead-out amount data set is ycl/N, and yclg is stored; if the valid data counter yc ≠ 0, executing step 9;
step 9, if the valid data counter yc is not equal to N-1, making yc equal to yc +1, and storing the lead-out amount data set valid data average value yclg equal to yclg + ycl/N; the extraction amount PID arithmetic unit receives the external OPEU instruction wb to be ON, and executes the step 6;
if the valid data counter yc is N-1, the extraction amount data set average value yca is yclg + ycl/N, the extraction amount PID operator receives the external OPEU command wb is OFF, and sets the valid data counter yc to 0, the invalid data counter wc to 0, and the invalid data set counter wsc to 0, and executes step 13;
step 10, the derived quantity PID operator receives an external OPEU command wb ═ ON;
step 11, if the invalid data counter wc ≠ M-1, making wc ═ wc +1, executing step 6;
if the invalid data counter wc is equal to M-1, making the valid data counter yc equal to 0 and the invalid data counter wc equal to 0, and executing step 12;
step 12, if the invalid dataset counter wsc ≠ L-1, making wsc ≠ wsc +1, executing step 6;
if the invalid data set counter wsc is equal to L-1, making wsc equal to 0, forcing a manual signal qz to be ON, sending the signal to a lead-out quantity PID controller to force to be in a manual mode, and simultaneously sending the signal to a voice alarm system to prompt that the manual mode is forced to be changed;
step 13, adding set values SP, feedback values PV and output values OPEU of the led-out PID controllers and the temperature PID controllers as standard historical data acquisition items; setting a set value SP of a lead-out quantity PID controller; the extraction amount PID controller calculates an output value OPEU according to the average value ycla of the latest extraction amount data set as a feedback value of an extraction amount PID actuator PV;
before the average value yca of the lead-out quantity data set is output for the first time, the lead-out quantity PID controller is in a manual mode; let wb be ON, the extraction amount PID controller receives external OPEU, and the undisturbed switching from temperature control to extraction amount control is realized; the drawn-out external OPEU is calculated by the following formula:
external OPEU ═ AVG | (sp)i)；
After the average value yca of the lead-out quantity data set is output for the first time, the lead-out quantity PID controller is in an automatic mode; when a new extraction amount data set average value ycla is generated, namely when continuous M + N-1 extraction amounts can acquire enough N effective data, wb is OFF, the extraction amount PID controller calculates according to the latest extraction amount data set average value ycla as an extraction amount PID actuator PV feedback value, and outputs a value OPEU; during the period when the new yca is not generated, wb is ON, and the pulled amount PID controller receives the external OPEU, i.e., the output value OPEU of the pulled amount PID controller remains unchanged;
step 14, calculating the output value OPEU of the extraction PID controller according to the following formula, and then transmitting the signal to each heating loop temperature control PID controller temperature set value SP which directly influences the extraction change of the channeli；
SPi＝ki× derived quantity PID controller OPEU + deltai
Wherein k isiControlling the activity of each temperature control loop according to the geometric parameters; deltaiControlling the activity equal difference parameters of the loops for each temperature;
each temperature control loop feeds back the temperature PV according to the continuous correspondenceiOutputting continuous instruction OPEU through PID controller operation corresponding to temperatureiAnd the temperature control signals are transmitted to an electrical control cabinet to realize the temperature control of the areas controlled by the heating loops of the channels and the real-time automatic control of the output quantity.
2. The method of claim 1, wherein the pull-in linear speed xsd is in accordance with the execution period t of CM0And (6) displaying.
3. The method of claim 1, wherein the plate weight bz and the draw-out amount ycl are controlled at a time interval t0× T.
4. The method of claim 1, wherein the time count target value T is set in accordance with the following rule: time interval t0× T is standard history numberAccording to an integer multiple of the acquisition time interval.
5. The method of claim 1, wherein the average value yca of the effective data of the lead-out amount data set is displayed at an unfixed time interval at which a number of N effective data can be collected for M + N-1 continuous lead-out amounts according to the lead-out amount data set.
6. The method for automatically controlling the glass extraction amount of the liquid crystal substrate as claimed in claim 1, wherein the degree of passivation of the PID controller of the extraction amount is adjusted by adjusting the values of M and N.
7. The method according to claim 1, wherein in step 14, SP is set or calculatedi、ki、ΔiAnd adjusting the activity of each heating loop of the cooling section of the channel and the feeding groove in the adjustment of the lead-out amount.
8. The method of claim 1, wherein k is controlled according to the following ruleiAnd ΔiSetting or calculating;
when the geometric relation is adopted, the ratio of the two components is determined,
setting of deltai＝0，ki＝SPiExtracted quantity PID controller OPEU;
when the relation of equal difference is adopted,
setting ki＝1，Δi＝SPi-a derived quantity PID controller OPEU.
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Application publication date: 20200825

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