CN102759939B - Control system and control method of annealing furnace - Google Patents
Control system and control method of annealing furnace Download PDFInfo
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- CN102759939B CN102759939B CN201210221918.XA CN201210221918A CN102759939B CN 102759939 B CN102759939 B CN 102759939B CN 201210221918 A CN201210221918 A CN 201210221918A CN 102759939 B CN102759939 B CN 102759939B
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Abstract
The invention relates to the field of optical glass annealing, and particularly discloses a control system and a control method of an annealing furnace. The control system comprises a temperature measuring module and a control module, wherein the temperature measuring module is arranged inside the annealing furnace and is used for measuring a middle part temperature value and a side part temperature value inside the annealing furnace, and transmitting the measured temperature values to a temperature adjusting module; the temperature adjusting module is connected with the temperature measuring module and is used for feeding back the middle part temperature value and the side part temperature value to the control module and controlling a heating device according to a temperature control instruction from the control module; the control module is used for generating the temperature control instruction including control parameters based on a preset temperature control curve and transmitting the temperature control instruction to the temperature adjusting module, and is further used for modifying the control parameters set based on the temperature control curve according to the middle part temperature value and the side part temperature value, and generating the temperature control instruction including modified control parameters. With the adoption of the system and the method provided by the invention, the annealing temperature of optical glass inside the annealing furnace can be precisely controlled automatically; and the annealing yield and the production efficiency of the glass can be improved.
Description
Technical field
The present invention relates to During Annealing of Optical Glass field, relate in particular to a kind of control system and control method of annealing furnace.
Background technology
Fine annealing is a key link in optical glass production run.General fine annealing is that glass is placed in to annealing furnace, by annealing furnace, glass is carried out to homogeneous heating to the transition temperature Tg that approaches glass, and after being incubated a period of time more successively through two stages of slow cooling and rapid cooling at the uniform velocity, thereby the requirement that makes the unrelieved stress of inside glass reach processing and use.
The annealing furnace thermal capacitance of filling glass is larger, and in stove, diverse location temperature contrast is also larger, and as independent employing humidostat carries out temperature control, annealing yields is often not high, has a strong impact on production efficiency and energy consumption index.
The Chinese patent that publication number is CN2839274 provides a kind of optical glass fast annealing resistor furnace automatic control system, and this system only detects burner hearth middle part temperature, and usings that this controls as output of controlling temperature and carrying out power regulator.Yet owing to there being glass thermal capacitance, middle part temperature feedback can relatively lag behind in limit portion temperature, may cause thus middle part temperature normal, and limit portion temperature exceeding standard, impact annealing quality.
The Chinese patent that publication number is CN201828840U provides a kind of automatic temperature control system of annealing furnace, and this control system adopts average weighted method, according to the temperature value of a plurality of check points in stove, calculates actual furnace temperature.But in actual applications, due to the difference of glass charging capacity, the weight coefficient of the temperature of each check point is more difficult to be determined, the unevenness that is therefore still difficult to temperature in elimination or alleviation stove is controlled the adverse effect of bringing to temperature.
In addition, in prior art, to the adjusting of glass temperature in annealing furnace, be all by manually intervening, not only can not realize according to the actual conditions of temperature in stove and automatically adjusting, also waste a large amount of manpowers.
Summary of the invention
The technical problem to be solved in the present invention is how automatically accurately to control the annealing temperature of optical glass in annealing furnace, thereby improves the annealing yields of glass, promotes glass quality.
The embodiment of the present invention provides a kind of control system of annealing furnace, comprising:
Temperature measurement module, is arranged in described annealing furnace, for the temperature of measuring in described annealing furnace middle part as the temperature of middle part temperature value and described annealing furnace inner edge portion as limit portion temperature value, and the described middle part temperature value recording and described limit portion temperature value are sent;
Temperature adjustment module, be connected with described temperature measurement module, for the described middle part temperature value receiving and described limit portion temperature value are fed back to control module, also according to the temperature control instruction from described control module, control the heating arrangement for described annealing furnace is heated; And
Described control module, generates to comprise for the temperature control curve based on predetermined and controls the temperature control instruction of parameter and described temperature control instruction is sent to described temperature adjustment module; The control parameter for setting based on described temperature control curve according to described middle part temperature value and the temperature value correction of described limit portion also, and generate the temperature control instruction that comprises revised control parameter.
The embodiment of the present invention also provides a kind of control method of annealing furnace, comprises the following steps:
Temperature control curve based on predetermined generates and comprises the temperature control instruction of controlling parameter;
According to described temperature control instruction, control the heating arrangement for described annealing furnace is heated;
The temperature of obtaining middle part in described annealing furnace as the temperature of middle part temperature value and described annealing furnace inner edge portion as limit portion temperature value;
Control parameter correction step, according to described middle part temperature value, described limit portion temperature value, the control parameter of setting based on described temperature control curve is revised;
The temperature control instruction that generation comprises revised control parameter; And
According to the temperature control instruction that comprises described revised control parameter, control the heating arrangement for described annealing furnace is heated.
The control system of annealing furnace provided by the invention and control method, by predefined control parameter being revised automatically according to the middle part temperature value in annealing furnace, can realize the accurate control to glass temperature in stove, the temperature difference that elimination causes due to glass thermal capacitance, improve the annealing yields of product, thereby improved production efficiency, saved manpower.
Accompanying drawing explanation
The module map of the control system of the annealing furnace that Fig. 1 provides for one embodiment of the invention;
The structural representation of the control system of the annealing furnace that Fig. 2 provides for another embodiment of the present invention;
The process flow diagram of the control method of the annealing furnace that Fig. 3 provides for another embodiment of the present invention.
description of reference numerals
11: resistance wire; 2: power module; 21: pressure regulator; 3: temperature measurement module; 31: middle heat galvanic couple; 32: limit portion thermopair; 4: control module; 41: man-machine interface; 42: programmable logic controller (PLC) (Programmable Logic Controller, PLC); 5: temperature adjustment module; 51: temperature instrument; 52: temperature control instrument; 6: annealing furnace.
Embodiment
The module map of the control system of the annealing furnace that Fig. 1 provides for one embodiment of the invention, the structural representation of the control system of the annealing furnace that Fig. 2 provides for another embodiment of the present invention.This control system comprises: temperature measurement module 3, control module 4 and temperature adjustment module 5.
Wherein, the annealing furnace in the present embodiment 6 is specially box-annealing furnace.In annealing furnace 6, be provided with heating module, in the present embodiment, it is preferably resistance wire 11, is evenly arranged on the inwall of annealing furnace 6, for annealing furnace 6 is heated, thereby the glass in annealing furnace 6 is heated.Resistance wire 11 is connected with the pressure regulator 21 as power module 2, and this pressure regulator 21 is preferably thyristor alternating-current pressure regulator, is used to resistance wire 11 to provide heating electric to press, and this voltage can regulate.Wherein power module 2 and resistance wire 11 are configured for the heating arrangement that annealing furnace 6 is heated, and can press to implement the control to heating arrangement by the heating electric that regulates power module 2 to provide.
Temperature measurement module 3 is arranged in annealing furnace 6, for the temperature value of measuring in annealing furnace middle part as the temperature value of middle part temperature value and annealing furnace inner edge portion as limit portion temperature value, and the temperature value recording is sent to temperature adjustment module 5.Further, temperature measurement module 3 comprises middle part temperature measuring unit and limit portion temperature measuring unit, is respectively used to measure above-mentioned middle part temperature value and limit portion temperature value.
Preferably, the temperature measurement module in the present embodiment 3 comprises middle heat galvanic couple 31 and limit portion thermopair 32.Middle heat galvanic couple 31 is arranged on burner hearth centre position, for measuring above-mentioned middle part temperature value, and the middle part temperature value recording is sent to temperature adjustment module 5; Limit portion thermopair 32 is arranged on burner hearth limit portion, preferably near being positioned at the resistance wire 11 of burner hearth limit portion, for measuring above-mentioned limit portion temperature value, and the limit portion temperature value recording is sent to temperature adjustment module 5.
Control module 4 generates and comprises the temperature control instruction of controlling parameter for the temperature control curve based on predetermined, and this temperature control instruction is sent to temperature adjustment module 5; Also, for according to the middle part temperature value Correction and Control parameter of temperature adjustment module 5 feedbacks, generate the temperature control instruction that comprises this revised control parameter, and this temperature control instruction is sent to temperature adjustment module 5.
Temperature adjustment module 5 is connected with temperature measurement module 3, control module 4 and power module 2, for the middle part temperature value obtaining and limit portion temperature value are fed back to control module 4; Also, according to the control parameter in the temperature control instruction receiving, regulate the output of power module 2.
Particularly, control module 4 comprises: instruction generation unit and computing unit.
Wherein, instruction generation unit is for generate the control parameter comprise setting or the temperature control instruction of revised control parameter based on temperature control curve, and temperature control instruction is sent to temperature adjustment module 5.Middle part temperature value when computing unit reaches steady state (SS) for calculating annealing furnace 6 and the difference between limit portion temperature value, and the control parameter being associated with subsequent control section in temperature control curve according to this difference pair calculates, obtain revised control parameter.Further, while breaking down due to some parts of control system, also can make to occur difference between middle part temperature value and limit portion temperature value, and this difference can be larger, therefore (for example 15 degrees Celsius of threshold values have rule of thumb been preset, in fact the value within the scope of 15 ~ 20 degrees Celsius can), so control module 4 also comprises judging unit and alarm unit.Judging unit is for judging whether the difference that computing unit calculates is greater than threshold value; When being less than or equal to this threshold value, computing unit calculates and Correction and Control parameter; Alarm unit is judged as and when this difference is greater than threshold value, sends warning at judging unit.
Wherein, annealing furnace 6 reaches the situation that steady state (SS) refers to that limit portion temperature value equals the control parameter that is associated with current control section in temperature control curve and has at least continued predetermined time section.
Preferably, the control module 4 of the present embodiment comprises man-machine interface 41 and PLC 42.
Further, temperature adjustment module 5 comprises: detecting unit and regulon.Preferably, be respectively temperature instrument 51 and temperature control instrument 52.
Wherein, detecting unit is connected with PLC 42 and middle part temperature measuring unit, and temperature instrument 51 is connected with PLC 42 and middle heat galvanic couple 31, for obtaining the middle part temperature value that middle heat galvanic couple 31 records and this middle part temperature value being sent to PLC 42; Regulon is connected with PLC 42, limit portion temperature measuring unit (being limit portion thermopair 32) and power module 2, for obtaining the limit portion temperature value that limit portion thermopair 32 records and this limit portion temperature value being sent to PLC 42, also for regulate the output voltage of power module 2 according to the temperature control instruction receiving.
For above-mentioned all parts, preferably, man-machine interface 41 is connected by telecommunication cable with the RS232 communication port of programmable logic controller (PLC) PLC 42 via its proposed standard (RS232) communication port, and man-machine interface 41 is for including to PLC 42 inputs the operating instruction of controlling parameter.The parameters such as lifting/lowering temperature time, temperature value and temperature retention time that this control parameter is each control section in the temperature control curve pre-establishing.According to actual process needs, a temperature control curve can be provided with a plurality of control sections, for example, comprise at least one section that heats up, temperature descending section and fast cooling section at a slow speed, and wherein each section that heats up also can comprise soaking zone.
The operating instruction that PLC 42 sends for receiving man-machine interface 41, and to temperature control instrument 52 inputs, include the temperature control instruction of controlling parameter according to control parameter wherein; PLC 42 also receives the progress that middle part temperature value and limit portion temperature value in stove are monitored annealing process in real time, and calculate middle part temperature value while reaching steady state (SS) in annealing furnace and the difference of limit portion temperature value, and judge whether this difference is greater than default threshold value, if be less than or equal to threshold value, to controlling parameter, revise, and the temperature control instruction that includes revised control parameter is sent to temperature control instrument 52; If be greater than threshold value, report to the police.
Makeover process comprises particularly: the control parameter in this difference and subsequent control section is calculated, obtained revised control parameter.For example: PLC 42 recalls the control parameter of subsequent control section from its storer, as the intensification desired temperature in annealing temperature and the desired temperature of lowering the temperature at a slow speed, and on the basis of this desired temperature, increase above-mentioned difference, obtain revised control parameter,
This steady state (SS) refers to: when limit portion temperature value arrives a certain temperature value lower than annealing temperature of setting, such as 200 degrees Celsius, 250 degrees Celsius etc., for example, with this temperature insulation a period of time (30-60 minute) afterwards, can think in stove and reach steady state (SS).
Preferably, the RS485 communication port of temperature control instrument 52 and the RS485 communication port of PLC 42 pass through twisted pair line connection, its signal input part is connected with limit portion thermopair 32 by compensating wire, and the signal input part of its signal output part and pressure regulator 21 passes through twisted pair line connection.Temperature control instrument 52 is for control the output voltage of pressure regulator 21 according to the temperature control instruction of PLC 42, thus the heating temp of controlling resistance silk 11; Temperature control instrument 52 also receives the limit portion temperature value that limit portion thermopair 32 records, and limit portion temperature value is sent to PLC 42.
Temperature control instrument 52 can utilize its inner proportion integration differentiation (Proportion Integration Differentiation, PID) calculation function to regulate the output voltage of pressure regulator 21, so that the temperature of burner hearth is by the temperature control curve operation of expection.For example, owing to there being glass thermal capacitance, in stove, middle part temperature value is lower than limit portion temperature value, that is to say: glass temperature is lower than the temperature in the predetermined control parameter of annealing process, at this moment just need to revise the limit portion temperature value on temperature control curve, the setting value of each temperature set-point on corresponding raising temperature control curve, now pressure regulator 21 increases output voltage, so that temperature rises in stove, guarantee that middle part temperature value raises, guarantee that glass temperature raises, can with the correction that requires in annealing process before temperature control curve in limit portion temperature value be consistent.
Preferably, the signal input part of temperature instrument 51 is also connected through compensating wire with middle heat galvanic couple 31, and the RS485 communication port of its RS485 communication port and PLC 42 is through twisted pair line connection.Temperature instrument 51 is for the middle part temperature value in the stove that obtains middle heat galvanic couple 31 and record, and middle part temperature value is sent to PLC 42.
In addition, for annealing process, occur abnormal, such as power module 2, there is annealing case when abnormal such as power-off, thus eliminated abnormal recover normal after, the computing unit in control module 3 carrys out Correction and Control parameter according to occurring to be positioned at which control section when abnormal.The present embodiment be take power module 2 generations extremely as example describes.
Particularly, if while extremely occurring in the intensification section in temperature control curve, the limit portion temperature value when recovering normal was revised the heating-up time of this intensifications section, so that the heating rate of this intensification section remains unchanged, annealing furnace can heat up according to this heating rate;
If while extremely occurring in the fast cooling section in temperature control curve, the limit portion temperature value when recovering normal is revised the temperature fall time of this fast cooling section, so that the rate of temperature fall of this fast cooling section remains unchanged, annealing furnace can be lowered the temperature according to this rate of temperature fall; And
If while extremely occurring in the temperature descending section at a slow speed in temperature control curve, determine in temperature control curve adjacent in this intensification section before temperature descending section at a slow speed, and middle part temperature value, limit portion temperature value when recovering normal revise the control parameter of this intensifications section, so that can again enter this temperature descending section at a slow speed via this intensification section.
For example, if the initial temperature of the section that heats up is 100 °, end temp is 500 °, and heating rate is v1, and the limit portion temperature value that power module 2 occurs when abnormal is 400 °, extremely occurs in the section that heats up.When power module 2 recovers normal, no matter limit portion temperature value is now positioned at this intensifications section or is positioned at other control section, and limit portion temperature value and v1 when computing unit is all normal according to recovery revised the heating-up time.Then instruction generation unit generates temperature control instruction based on this revised control parameter, and this temperature control instruction is sent to temperature adjustment module 5, temperature adjustment module 5 is controlled heating arrangement according to this temperature control instruction, makes annealing furnace the speed with v1 to be heated up and to enter next control section by this intensification section.
If the initial temperature of temperature descending section is 500 ° at a slow speed, end temp is 300 °, and control section the last period of temperature descending section is the section that heats up at a slow speed, and heating rate is v2, and the limit portion temperature value that power module 2 occurs when abnormal is 350 °, extremely occurs in temperature descending section at a slow speed.When power module 2 recovers normal, no matter which control section limit portion temperature value has at this moment dropped to, and computing unit all middle part temperature value and the limit portion temperature value when recovering normal was revised the heating-up time.Then instruction generation unit generates temperature control instruction based on this revised control parameter, and this temperature control instruction is sent to heating arrangement, annealing furnace can the speed with v2 be heated up by this intensification section, when temperature is elevated to 500 ° again, and through predetermined temperature retention time, then enter temperature descending section at a slow speed.
Above control procedure completes automatically, thereby reduced annealing process, manpower and materials when abnormal occurs, and can guarantee the yields of annealing, and enhances productivity.
The present embodiment based on principle be: glass actual temperature approaches in middle part temperature value and stove, can represent glass temperature with middle part temperature value; The temperature of limit portion temperature value and the resistance wire heating of limit portion approaches, and can control the temperature in parameter with the temperature value representative of limit portion; But because glass exists thermal capacitance, therefore middle part temperature value can lag behind limit portion temperature value (for example, when limit portion temperature value is 220 degrees Celsius, representing that the middle part temperature value of Annealing Temperature of Glass may only reach 200 degrees Celsius).Therefore need to measure in real time middle part temperature value, and utilize middle part temperature value to go Correction and Control parameter, thereby realize the accurate control to temperature in stove, improve the annealing quality of optical glass.
Details are as follows for the principle of work of the control system of the annealing furnace that the present embodiment provides:
User contains to PLC 42 inputs the operating instruction of controlling parameter by man-machine interface 41, PLC 42 generates to comprise according to this operating instruction and controls the temperature control instruction of parameter and be sent to temperature control instrument 52, temperature control instrument 52 is controlled the output of pressure regulator 21 according to temperature control instruction, make the output voltage of pressure regulator 21 can guarantee that resistance wire 11 produces suitable heat glass in stove is heated.Temperature instrument 51 reads in real time the middle part temperature value that middle heat galvanic couple 31 records and is sent to PLC 42, temperature control instrument 52 reads in real time the limit portion temperature value that limit portion thermopair 32 records and is sent to PLC 42, makes PLC 42 can monitor the progress of annealing process.When in stove, glass reaches steady state (SS), middle part temperature value under PLC 42 these steady state (SS)s of calculating and the difference of limit portion temperature value, then judge according to the threshold value of storage, if this time difference value exceeds threshold value, illustrate that in this annealing furnace, some parts may break down, report to the police; Wherein this threshold value can be for once the value of testing, for example 15-20 degree; If do not exceed threshold value, PLC 42 recalls the control parameter of subsequent control section from its storer, utilize middle part temperature value to proofread and correct this control parameter, obtain revised control parameter, and the temperature control instruction that includes revised control parameter is sent to temperature control instrument 52, temperature control instrument 52 regulates the output of pressure regulator 21 according to this revised control parameter, thus the degree of heat of regulating resistance silk 11, the temperature of glass in regulating stove.
The process flow diagram of the control method of the annealing furnace that Fig. 3 provides for another embodiment of the present invention, this control method comprises the following steps:
Step S11, control module generate and comprise the temperature control instruction of controlling parameter according to predetermined temperature control curve, and this temperature control instruction is sent to temperature adjustment module;
Step S12, temperature adjustment module control the voltage of power module output for annealing furnace is heated according to the temperature control instruction receiving, and temperature adjustment module is also obtained in the stove that temperature measurement module records middle part temperature value and limit portion temperature value and is sent to control module; Temperature adjustment module regulates the output voltage of power module according to revised control parameter;
Step S13, control module judge whether all control sections of this temperature control technique complete, are to finish, otherwise execution step S14;
Step S14, control module judge whether to occur abnormal; To perform step S15, otherwise execution step S16;
It is normal that step S15, control module judge whether to recover; Be to perform step S18, otherwise continue to detect whether recovered normal;
Step S16, control module judge whether annealing process reaches steady state (SS) in current control section, is to perform step S17, otherwise execution step S12;
Middle part temperature value when step S17, control module reach steady state (SS) according to annealing furnace and limit portion temperature value are revised controlling parameter, then generate and include the temperature control instruction of revised control parameter and be sent to temperature adjustment module;
Middle part temperature value and limit portion temperature value after the control section that step S18, control module are positioned at when abnormal according to generation and recovery are normal carry out Correction and Control parameter, and generate the temperature control instruction that comprises revised control parameter; Then perform step S12.
The control system of annealing furnace provided by the invention and control method, by the middle part temperature value in annealing furnace, predefined control parameter is revised automatically, can realize the accurate control to glass temperature in stove, the temperature difference that elimination causes due to glass thermal capacitance, improve the annealing yields of product, thereby improved production efficiency, saved manpower.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, to come the hardware that instruction is relevant to complete by computer program, described program can be stored in a computer read/write memory medium, this program, when carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Claims (10)
1. a control system for annealing furnace, is characterized in that, comprising:
Temperature measurement module, is arranged in described annealing furnace, for the temperature of measuring in described annealing furnace middle part as the temperature of middle part temperature value and described annealing furnace inner edge portion as limit portion temperature value, and the described middle part temperature value recording and described limit portion temperature value are sent;
Temperature adjustment module, be connected with described temperature measurement module, for the described middle part temperature value receiving and described limit portion temperature value are fed back to control module, also according to the temperature control instruction from described control module, control the heating arrangement for described annealing furnace is heated; And
Described control module, generates to comprise for the temperature control curve based on predetermined and controls the temperature control instruction of parameter and described temperature control instruction is sent to described temperature adjustment module; The control parameter for setting based on described temperature control curve according to described middle part temperature value, the temperature value correction of described limit portion also, and generate the temperature control instruction that comprises revised control parameter, described control module comprises:
Instruction generation unit, be connected with described temperature adjustment module, for generate the control parameter that comprises described setting or the temperature control instruction of described revised control parameter based on described temperature control curve, and described temperature control instruction is sent to described temperature adjustment module; And
Computing unit, be connected with described temperature adjustment module, difference described in when calculating described annealing furnace and reach steady state (SS) between middle part temperature value and described limit portion temperature value, and the control parameter being associated with subsequent control section in described temperature control curve according to described difference pair revises, to obtain described revised control parameter.
2. the control system of annealing furnace according to claim 1, it is characterized in that, described annealing furnace reaches the situation that steady state (SS) refers to that described limit portion temperature value equals the control parameter that is associated with current control section in described temperature control curve and has at least continued predetermined time section.
3. the control system of annealing furnace according to claim 1 and 2, is characterized in that, described control module also comprises:
Judging unit, is connected with described computing unit, for judging whether described difference is greater than predetermined threshold value; And
Alarm unit, is connected with described judging unit, for when being judged as described difference and being greater than described threshold value, sends and represents to have occurred abnormal warning.
4. the control system of annealing furnace according to claim 3, is characterized in that, described computing unit also for, thereby describedly extremely recover in normal situation having eliminated,
If described, extremely occur in the control section of conduct intensification section in described temperature control curve, the described limit portion temperature value when recovering is revised the control parameter as the heating-up time of this intensifications section, so that the heating rate of this intensification section remains unchanged;
If described, extremely occur in described temperature control curve the control section as fast cooling section, the described limit portion temperature value when recovering is revised the control parameter as temperature fall time of this fast cooling section, so that the rate of temperature fall of this fast cooling section remains unchanged; And
If described, extremely occur in described temperature control curve as the control section of temperature descending section at a slow speed, determine in described temperature control curve as adjacent in this control section of the intensification section before temperature descending section at a slow speed, and the described middle part temperature value when recovering, described limit portion temperature value revise the control parameter of this intensifications section, so that can again enter this temperature descending section at a slow speed via this intensification section.
5. the control system of annealing furnace according to claim 1, is characterized in that, described temperature measurement module comprises:
Middle part temperature measuring unit, is arranged on the middle part in described annealing furnace, for measuring described middle part temperature value; And
Limit portion temperature measuring unit, is arranged on the limit portion in described annealing furnace, for measuring described limit portion temperature value.
6. the control system of annealing furnace according to claim 5, is characterized in that, described temperature adjustment module comprises:
Detecting unit, is connected with described control module and described middle part temperature measuring unit, for the middle part temperature value from described middle part temperature measuring unit is sent to described control module; And
Regulon, be connected with described control module and described limit portion temperature measuring unit, for the limit portion temperature value from described limit portion temperature measuring unit is sent to described control module, also for controlling the described heating arrangement for described annealing furnace is heated according to the temperature control instruction from described control module.
7. a control method for annealing furnace, is characterized in that, comprises the following steps:
Temperature control curve based on predetermined generates and comprises the temperature control instruction of controlling parameter;
According to described temperature control instruction, control the heating arrangement for described annealing furnace is heated;
The temperature of obtaining middle part in described annealing furnace as the temperature of middle part temperature value and described annealing furnace inner edge portion as limit portion temperature value;
Control parameter correction step, according to described middle part temperature value, described limit portion temperature value, the control parameter of setting based on described temperature control curve is revised;
The temperature control instruction that generation comprises revised control parameter; And
According to the temperature control instruction that comprises described revised control parameter, control the heating arrangement for described annealing furnace is heated,
Wherein, described control parameter correction step specifically comprises:
Difference described in when calculating described annealing furnace and reaching steady state (SS) between middle part temperature value and described limit portion temperature value;
When described difference is not more than predetermined threshold value, the control parameter being associated with subsequent control section in described temperature control curve according to described difference pair is revised, to obtain described revised control parameter, or
When described difference is greater than described threshold value, sends and represent to have occurred abnormal warning.
8. the control method of annealing furnace according to claim 7, is characterized in that, described threshold value is 15 degrees Celsius.
9. according to the control method of the annealing furnace described in claim 7 or 8, it is characterized in that,
Described annealing furnace reaches the situation that steady state (SS) refers to that described limit portion temperature value equals the control parameter that is associated with current control section in described temperature control curve and has at least continued predetermined time section.
10. the control method of annealing furnace according to claim 7, is characterized in that, described control parameter correction step also comprises, thereby describedly extremely recovers in normal situation having eliminated:
If described, extremely occur in the control section of conduct intensification section in described temperature control curve, the described limit portion temperature value when recovering is revised the control parameter as the heating-up time of this intensifications section, so that the heating rate of this intensification section remains unchanged;
If described, extremely occur in described temperature control curve the control section as fast cooling section, the described limit portion temperature value when recovering is revised the control parameter as temperature fall time of this fast cooling section, so that the rate of temperature fall of this fast cooling section remains unchanged; And
If described, extremely occur in described temperature control curve as the control section of temperature descending section at a slow speed, determine in described temperature control curve as adjacent in this control section of the intensification section before temperature descending section at a slow speed, and the described middle part temperature value when recovering, described limit portion temperature value revise the control parameter of this intensifications section, so that can again enter this temperature descending section at a slow speed via this intensification section.
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| DE102013204680A1 (en) * | 2013-03-18 | 2014-09-18 | Krones Ag | DEVICE FOR CONTROLLING A TEMPERATURE DEVICE OF A BLOW-MOLDING MACHINE AND METHOD FOR CONTROLLING A TEMPERING UNIT OF A BLOW-FORMING MACHINE |
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| CN105182768A (en) * | 2015-08-17 | 2015-12-23 | 惠州莫思特科技有限公司 | Intelligent control system |
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| CN202694181U (en) * | 2012-06-29 | 2013-01-23 | 湖北新华光信息材料有限公司 | Control system of annealing furnace |
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