CN107807514B - Cover plate glass lead-out amount control method - Google Patents
Cover plate glass lead-out amount control method Download PDFInfo
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- CN107807514B CN107807514B CN201710947878.XA CN201710947878A CN107807514B CN 107807514 B CN107807514 B CN 107807514B CN 201710947878 A CN201710947878 A CN 201710947878A CN 107807514 B CN107807514 B CN 107807514B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000005357 flat glass Substances 0.000 title claims description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000006059 cover glass Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 43
- 238000010309 melting process Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000006060 molten glass Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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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
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Control Of Temperature (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention discloses a cover glass lead-out amount control method, which comprises the steps of optimizing and adjusting PID parameters of automatic heating equipment, effectively controlling a DCS control system, manually pre-judging and pre-adjusting various temperatures and parameters of a tank furnace, effectively judging the change of various temperature parameters of the tank furnace in time, changing the change of the heating amount of a channel in time, increasing the heating amount of the channel when the temperature of the tank furnace is low, reducing the heating amount of the channel when the temperature of the tank furnace is high, effectively correcting and controlling the PID parameters of the equipment, decomposing the change of the lead-out amount into the change of the weight of each plate, introducing the weight data parameters of each plate into the control parameters, introducing the weight data signals of each plate into the control parameters, and controlling the weight of each plate.
Description
Technical Field
The invention belongs to the technical field of cover plate glass manufacturing, and particularly relates to a cover plate glass lead-out amount control method.
Background
In the manufacture of cover plate glass, the extraction amount is the weight of molten glass flowing out of a discharge channel in the cover plate glass per hour and the weight of molten glass flowing out of a forming overflow brick, namely the weight of the molten glass flowing out per hour, the unit is kg/hr, the extraction amount is determined at the initial design stage, the stability of the extraction amount is critical to the melting process and quality, and is one of three major parameters of melting and also is a determining factor of the main grade (warpage, stress and thickness) of forming. Referring to fig. 1, the main determining factors of the stable lead-out quantity at present are the unstable change of the temperature of the tank furnace, the change of the heating quantity of a channel (a flowing pipeline of molten glass), and the influence factors of the environment temperature and humidity, the unstable change of the temperature of the tank furnace is caused due to the unstable melting of batch materials of the tank furnace, the instability of the lead-out quantity of the channel is indirectly caused, the control capability of the whole industry on the lead-out quantity is poor, and the problem that the production quality of the cover plate glass is improved due to how to effectively control the lead-out quantity of the cover plate glass is to be solved by the cover plate glass production control system.
Disclosure of Invention
In order to solve the problems, the invention provides a method for controlling the extraction amount of cover glass, which controls the extraction amount by effectively preparing and optimizing PID (proportion, integral and differential control) parameters of equipment and combining manual effective timely intervention and adjustment, so that the fluctuation of the extraction amount of the cover glass is controlled within an effective range.
In order to achieve the aim, the method for controlling the lead-out quantity of the cover plate glass comprises the following steps:
step 1, setting a proportional coefficient Kp: device for placingTi＝0，TdIncreasing Kp from 5 to 25, TiAnd TdKeeping the temperature constant until the steady-state error of the temperature control system is less than or equal to +/-5 percent;
step 2, setting integral coefficient Ti: when the steady state error of the temperature control system is less than +/-5%, adding integral control, firstly reducing Kp by 10-30% to ensure that T isdWhen the integral coefficient T is equal to 0, the integral coefficient T is further determinediRegulating from small to large, TiThe value range of (1) is 0-5, and at the moment, Kp and TdKeeping the temperature constant until the steady-state error of the temperature control system is less than or equal to +/-1%;
step 3, setting the differential coefficient Td: when the steady state error is less than or equal to +/-1%, if the dynamic response of the temperature control system can not meet the requirement, the Kp and the T are calculatediAll reduce by 15% -25% and keep the T unchangeddRegulating from small to large, TdThe value range of (1) is 0-1 until the steady state error of the temperature control system is less than or equal to +/-0.2%;
step 4, after the steps 1 to 3, if the difference between the actual temperature and the set temperature of the cooling section and the feeding tank is greater than 0.5 ℃, manually controlling and adjusting the heating quantity of the channel; when the difference between the actual temperature and the set temperature of the cooling section and the feeding tank is less than 0.5 ℃, the DCS equipment automatically adjusts the temperature; after the steps 1 to 3, if the temperature fluctuation is more than 1 ℃, an emergency procedure is carried out.
In step 4, the manual control comprises: the temperature of a cooling section and a feeding tank of the loop is manually reduced, when the current temperature is reduced and the current is stably reduced, the temperature set values of the cooling section and the feeding tank are modified according to the weight change of the cover glass single plate, when the current temperature of the loop and the weight of the single plate are lower, the temperature is automatically adjusted by a DCS according to the temperature difference to be raised, when the current temperature is raised and the current is stably raised, the set values are modified according to the weight change of the single plate, and the set values are gradually adjusted to the initial set values.
In step 1, the increment of each adjustment is 1 in the process of increasing Kp gradually, and in step 2, T isiAdjusting the increment to be 0.5 from small to large, and the stepIn 3, TdThe increment is 0.2 when the adjustment is carried out from small to large.
In step 4, the emergency procedure comprises:
1) according to the change condition of the temperature, when the current temperature of the feeding pipe and the cooling section is 1 ℃ higher than the set value, and the temperature is still in an uncontrolled state, the heating power of the heating rod is reduced in the forming procedure, and the muffle furnace is ready for emergency exit; when the temperature of the melting process is not controlled, namely the temperature is continuously increased, the muffle furnace is exited.
2) The opening degree of the cooling section is continuously reduced, and when the power of the cooling section is lower than 12kw, a passage skylight and a passage are opened to increase a convection fan;
3) the opening degree of the cooling section is continuously reduced, when the power of the cooling section is lower than 8kw, emergency air of the cooling section is started, the feeding pipe is removed for heat preservation, and cooling air of the feeding pipe is started;
4) and the opening degree of the cooling section is continuously reduced, and when the power of the cooling section is lower than 5kw and the temperature is not controlled, the muffle furnace is withdrawn.
The PID control formula is:
finally set PID parameter KpThe value range of (1) is 10-20; t isiThe value range of (1) to (3) minutes; t isdThe value range of (a) is 0 to 1 minute.
Compared with the prior art, the invention has at least the following beneficial technical effects that the PID parameters of the equipment of the automatic heating equipment are optimized and adjusted, the effective control is carried out through a DCS (distributed control system) (PID sends parameter instructions to the DCS and is executed by the DCS), the pre-judgment and pre-adjustment of the temperature and the parameters of the tank furnace are carried out manually, the change of the temperature parameters of the tank furnace is effectively judged in time, the change of the channel heating amount is changed in time, the channel heating amount is increased when the temperature of the tank furnace is low, the channel heating amount is reduced when the temperature of the tank furnace is high, the PID parameters of the heating equipment are effectively corrected and controlled, and the weight of each glass plate is controlled by controlling the temperature (namely the channel temperature) of a flow pipeline of glass liquid.
Further, the manual control comprises: the temperature of a cooling section and a feeding tank of the loop is manually reduced, when the current temperature is reduced and the current is stably reduced, the temperature set values of the cooling section and the feeding tank are modified according to the weight change of the cover glass single plate, when the current temperature of the loop and the weight of the single plate are lower, the temperature is automatically adjusted by a DCS according to the temperature difference to be raised, when the current temperature is raised and the current is stably raised, the set values are modified according to the weight change of the single plate, and the set values are gradually adjusted to the initial set values. The extraction amount can be further stably controlled within an effective range through manual control.
Further, in step 1, the increment of each adjustment is 1 during the process of increasing Kp, and in step 2, T isiThe increment is 0.5 when the adjustment is carried out from small to large, and in step 3, T isdThe increment is 0.2 when the adjustment is carried out from small to large, and the increment set by different coefficients is different according to the influence of the coefficients on a temperature control system, so that the stable change of a PID control system is ensured, and the large fluctuation is avoided to prolong the adjustment time.
Furthermore, in step 4, the emergency program comprises 4 progressive steps, different measures are taken at different stages, the emergent condition is timely solved, the abnormal change of the temperature is timely controlled, the follow-up greater risk is reduced, and the influence on the process and the quality is reduced.
Drawings
FIG. 1 is a graph of the relationship of an elicited quantity to factors that affect the elicited quantity;
FIG. 2 is a block diagram of the process of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
A method for controlling the leading-out quantity of cover glass comprises two steps of PID control and manual control,
step 1, PID control, wherein the PID control comprises the following steps:
step 1.1, setting a proportional coefficient Kp: put Ti＝0，TdSetting Kp as 0, starting from 5, increasing by 1 each time, and gradually increasingIncreasing the value range of Kp to 5-25, TiAnd TdKeeping the temperature constant until the steady-state error of the temperature control system is less than or equal to +/-5%.
Step 1.2, setting integral coefficient Ti: on the basis of proportional control, when the steady-state error of the temperature control system is less than +/-5%, integral control is required to be added, firstly, the adjusted Kp is reduced by 10-30%, and T is reduceddThe integral coefficient T is then adjusted to 0iRegulating from small to large, TiThe value range of (1) is 0-5, each time the value is increased by 0.5, at the moment, Kp and T aredThe values remain unchanged until the steady state error is equal to or less than ± 1%.
Step 1.3, setting the differential coefficient Td: when the steady state error is less than or equal to +/-1%, if the dynamic response of the temperature control system can not meet the requirement, adjusting Kp and TiDifferential control is added when the post-temperature control system is still unstable. Let Kp and TiAll reduce by 15% -25% to make TdFrom small to large, TdThe value range of (1) is 0-1, and each time the value is increased by 0.2TdIncreased Kp and TiUntil the steady-state error of temperature control is less than or equal to +/-0.2%.
The PID control formula is:
in the above formula: kp、Ti、TdRespectively referred to as the proportionality coefficient (gain), integral and differential time constants; e (t) r (t) -y (t) is a deviation signal; u (t) is a control signal.
The finally set PID parameter values are: kp:10～20；Ti1-3 minutes; t isd0 to 1 minute.
Step 2, manual control, wherein the manual control comprises the following steps:
step 2.1, when the temperatures of the loop cooling section and the feed tank or the weight of the veneer are continuously higher and cannot be controlled:
the temperature of a cooling section and a feeding tank of a loop is manually reduced, when the current temperature is reduced and the current is stably reduced, the set values of the cooling section and the feeding tank are moderately modified according to the weight change of a single plate, when the current temperature of the loop and the weight of the single plate are low, the temperature is automatically adjusted by a DCS according to the temperature difference to be raised, when the current temperature is raised and the current is stably raised, the set values are modified according to the weight change of the single plate, and the set values are gradually adjusted to the initial set values. The lead-out amount can be controlled within an effective range.
Step 2.2, when the temperature of the incoming materials of the tank furnace changes rapidly, the temperature of the cooling section and the feeding groove is kept for more than 0.5 hour and is higher by 0.5 ℃ and more:
because the PID adjustment of the automatic control loop is not timely, the opening degree of the cooling section, the cooling section and the feeding tank control loop is adjusted in time, and the size of the adjusted opening degree is determined according to the temperature variation, and the method specifically comprises the following steps:
2.2.1, according to the change condition of the temperature, when the current temperature of the feeding pipe and the cooling section is 1 ℃ higher than a set value and the temperature is still in an uncontrolled state, reducing the heating power of a heating rod in a forming procedure, preparing for emergency exit of the muffle furnace, and preventing the muffle furnace from being blocked by overlarge glass liquid flow; when the temperature of the melting process is not controlled, namely the temperature is continuously increased, the muffle furnace is exited.
Step 2.2.2, opening the cooling section continuously, and opening a passage skylight and a passage increase convection fan when the power of the cooling section is lower than 12 kw;
2.2.3, continuously reducing the opening of the cooling section, when the power of the cooling section is lower than 8kw, starting emergency air of the cooling section, removing a feeding pipe for heat preservation, and starting cooling air of the feeding pipe;
and 2.2.4, continuously reducing the opening of the cooling section, and when the power of the cooling section is lower than 5kw and the temperature is not controlled, withdrawing the muffle furnace.
Claims (4)
1. A cover plate glass lead-out amount control method is characterized by comprising the following steps:
step 1, setting a proportional coefficient Kp: put Ti＝0，TdSetting Kp as 0 and gradually increasingUntil increasing to 25, TiAnd TdKeeping the temperature constant until the steady-state error of the temperature control system is less than or equal to +/-5 percent;
step 2, setting integral coefficient Ti: when the steady state error of the temperature control system is less than +/-5%, adding integral control, firstly reducing Kp by 10-30% to ensure that T isdWhen the integral coefficient T is equal to 0, the integral coefficient T is further determinediRegulating from small to large, TiThe value range of (1) is 0-5, and at the moment, Kp and TdKeeping the temperature constant until the steady-state error of the temperature control system is less than or equal to +/-1%;
step 3, setting the differential coefficient Td: when the steady state error is less than or equal to +/-1%, if the dynamic response of the temperature control system can not meet the requirement, the Kp and the T are calculatediAll reduce by 15% -25% and keep the T unchangeddRegulating from small to large, TdThe value range of (1) is 0-1 until the steady state error of the temperature control system is less than or equal to +/-0.2%;
step 4, after the steps 1 to 3, if the difference between the actual temperature and the set temperature of the cooling section and the feeding tank is greater than 0.5 ℃, manually controlling and adjusting the heating quantity of the channel; when the difference between the actual temperature and the set temperature of the cooling section and the feeding tank is less than 0.5 ℃, the DCS equipment automatically adjusts the temperature; after the steps 1 to 3, performing an emergency program when the temperature fluctuation is more than 1 ℃;
the manual control in the step 4 comprises the following steps: manually reducing the temperature of a cooling section and a feeding tank of the loop, modifying the set values of the temperature of the cooling section and the feeding tank according to the weight change of a cover glass single plate when the current temperature is reduced and the current is stably reduced, automatically adjusting the temperature by a DCS according to the temperature difference to increase the temperature when the current temperature of the loop and the weight of the single plate are low, and gradually adjusting the set values to the initial set values according to the weight change of the single plate when the current temperature is increased and the current is stably increased;
in step 4, the emergency procedure comprises:
1) according to the change condition of the temperature, when the current temperature of the feeding pipe and the cooling section is 1 ℃ higher than the set value, and the temperature is still in an uncontrolled state, the heating power of the heating rod is reduced in the forming procedure, and the muffle furnace is ready for emergency exit; when the temperature of the melting process is continuously increased, the muffle furnace is withdrawn;
2) the opening degree of the cooling section is continuously reduced, and when the power of the cooling section is lower than 12kw, a passage skylight and a passage are opened to increase a convection fan;
3) the opening degree of the cooling section is continuously reduced, when the power of the cooling section is lower than 8kw, emergency air of the cooling section is started, the feeding pipe is removed for heat preservation, and cooling air of the feeding pipe is started;
4) and the opening degree of the cooling section is continuously reduced, and when the power of the cooling section is lower than 5kw and the temperature is not controlled, the muffle furnace is withdrawn.
2. The method for controlling the lead-out amount of a cover glass according to claim 1, wherein in step 1, the increment of each adjustment in the process of increasing Kp is 1, and in step 2, T isiThe increment is 0.5 when the adjustment is carried out from small to large, and in step 3, T isdThe increment is 0.2 when the adjustment is carried out from small to large.
3. The method for controlling the drawn amount of cover glass according to claim 1, wherein the PID control formula is:
4. the method for controlling the lead-out amount of a cover glass according to claim 1, wherein the finally set PID parameter KpThe value range of (1) is 10-20; t isiThe value range of (1) to (3) minutes; t isdThe value range of (a) is 0 to 1 minute.
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| CN110526554A (en) * | 2019-07-25 | 2019-12-03 | 彩虹集团（邵阳）特种玻璃有限公司 | A kind of method of cover-plate glass stirring rod cleaning |
| CN110687941B (en) * | 2019-08-15 | 2021-07-30 | 广东华中科技大学工业技术研究院 | System and method for synchronously controlling temperatures of upper die and lower die of 3D cover plate glass |
| CN111580473B (en) * | 2020-04-10 | 2021-05-28 | 彩虹集团有限公司 | Method for automatically controlling glass extraction amount of liquid crystal substrate |
| CN112947338B (en) * | 2021-02-10 | 2022-09-30 | 芜湖东旭光电科技有限公司 | Molten glass channel process control method and system |
| CN114920444B (en) * | 2022-05-30 | 2024-04-09 | 彩虹显示器件股份有限公司 | Auxiliary heating system for substrate glass channel and extraction quantity control method |
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Application publication date: 20180316 Assignee: Hunan Shaohong special glass Co.,Ltd. Assignor: XIANYANG BRANCH OF CAIHONG GROUP (SHAOYANG) SPECIAL GLASS CO.,LTD. Contract record no.: X2023980041903 Denomination of invention: A Method for Controlling the Extraction Amount of Cover Glass Granted publication date: 20210720 License type: Common License Record date: 20230920 |