CN105441665B - Heat-treatment furnace zero-time holding control method and its system - Google Patents
Heat-treatment furnace zero-time holding control method and its system Download PDFInfo
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- CN105441665B CN105441665B CN201610028901.0A CN201610028901A CN105441665B CN 105441665 B CN105441665 B CN 105441665B CN 201610028901 A CN201610028901 A CN 201610028901A CN 105441665 B CN105441665 B CN 105441665B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
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Abstract
The present invention uses heat-treatment furnace zero-time holding control method, Current Temperatures detecting element real time temperature T to determine that heated workpiece reaches zero-time holding condition exactly, in real time71Reach setting processing temperature T0, real time temperature T that rear detector unit detects72Close to or up setting processing temperature T0, the power output of heater is progressively close and reaches steady state power P0；When meeting above-mentioned fluctuation temperature difference △ T and heater input power condition, workpiece reaches zero-time holding state.Simultaneously invention additionally discloses the heat-treatment furnace zero-time holding control device for realizing this method, it is included in heating furnace and detector unit is installed, temperature detecting module is realized by detector unit and the temperature in electric furnace is detected；Detector unit comprises at least the preceding detector unit close to heater and the rear detector unit close to workpiece.The present invention can shorten soaking time, save the energy, reduce processing cost, improve product quality.
Description
Technical field
The present invention relates to a kind of Heat Treatment Control method and its system, more particularly to one kind to be heat-treated the high-precision of " zero-time holding "
Spend control method and its system.
Background technology
In field of machining, heat treatment is conventional and necessary process, is typically necessary the homogeneous heating for ensureing workpiece
Property, and in currently used industrial stove heat, technique person often rule of thumb writes the heating technique of heat treatment, including heating
Device rapid heating condition, close to after process goal temperature heater wattage output decline gradually be warming up to process goal temperature
Slow temperature-rise period, reach the insulating process that process goal temperature post-heater uses thermal balance power.But actual heated
Whether Cheng Zhong, inside workpiece temperature reach the target temperature of technological requirement, it is impossible to detected by accurate way, therefore in order to ensure
Technological requirement, the selection of its soaking time heated is all more conservative, typically all partially long, causes energy waste, or even " mistake occur
Burn " or " burning impermeable ", cause workpiece to scrap, bring unnecessary economic loss.
Recent decades, for workpiece heat technique, occur not only saving but also timesaving " zero-time holding " is theoretical, but it is due to work
Skill detection means can not meet actual requirement, many shortcomings in practice still be present, substantially also in theory stage, in reality
It is less in the application of border.
Chinese Patent Application No. 881059188, title " heat treatment of workpieces ' zero-time holding ' point microcomputer control device ", due to it
It is controlled according to the mathematical modeling that " zero-time holding " is theoretical and is derived by heat transfer theory, control parameter is easily by external condition
The influence of change, thus it is inevitable error be present with actual workpiece control temperature, cause workpiece uneven heating and " burning impermeable " or
" burning " etc., technique particularly high to heat treatment requirements, it can not meet to require.
Chinese Patent Application No. 951060007, title " controlling instrument for electric-heating technical parameter ", it is setting control parameter
" the engineering technology basis for estimation K of samming process0" when be also to set in advance based on experience value, record and " ensure equal such as its specification
Temperature difference △ T=T1-T310 DEG C of ＜ ", so it controls temperature difference precision relatively low, and fire box temperature T1Reach desired value, the object heart
Portion temperature T3Although differing 10 DEG C of ＜ therewith, object center portion temperature is still slowly rising, and illustrates material also in endothermic process
In, the temperature conditionss of material zero-time holding can not be judged with this.And in actual heating process, to workpiece surface and internal temperature
Detection it is very difficult can not even implement, for the high technique of technological requirement, its requirement can not be met.
Simultaneously above two technology be all judged using furnace temperature, inside workpiece temperature judges and power is judged using constantly becoming
Near mode, to whether reaching the power condition of zero-time holding and being derived from, therefore often exist in actual computer heating control
Temperature deviation, power deviation, it is impossible to reach the requirement being heat-treated in high precision, this is also the theoretical temperature of existing utilization " zero-time holding "
The reason for detecting and controlling system is not promoted effectively.It is mainly that Control System for Heat Treatment control temperature accuracy is not high, controlled
Parameter adaptation processed is not wide, detection electrical parameter is not complete, detection electrical parameter precision is not high, and existence and stability is poor, the original such as misjudgement erroneous judgement
Cause.
The content of the invention
The technical problems to be solved by the invention, which are to provide one kind, can determine that being heated workpiece reaches zero exactly, in real time
The high-precision Heat Treatment Control method of heat-retaining condition.
The present invention solves its technical problem and uses heat-treatment furnace zero-time holding control method, including heater to be rapidly heated
Journey, slow temperature-rise period and insulating process；Its insulating process is as follows,
The real time temperature T that Current Temperatures detecting element detects71Reach setting processing temperature T0, rear detector unit inspection
The real time temperature T measured72Close to or up setting processing temperature T0, the power output of heater is progressively close and reaches stable state work(
Rate P0；
Control real time temperature T71And T72In fluctuation temperature difference △ T ranges, the power output of heater is detected and controlled
System, in n Temperature Measure Control cycle TkInside meet the power output condition of following heater：
ΔPTKi=P0-PTKi
Heater is detected simultaneously by each Temperature Measure Control cycle TkInterior average output power PTkiAround stable state work(
Rate P0Upper and lower fluctuating error is less than X%；P0It is the average power content of multiple Temperature Measure Control cycle average output powers；
When meeting above-mentioned fluctuation temperature difference △ T and heater wattage output condition, workpiece reaches zero-time holding state.
Further, fluctuate temperature difference △ T control at ± 0.5~5 DEG C, the output power error X% of heater 6 controls≤
0.5~10%；Preferably, temperature difference △ T controls are fluctuated at ± 0.5~2 DEG C, the output power error X% of heater 6 is controlled 0.5
~2%.
The real time temperature T that Current Temperatures detecting element detects71, real time temperature T that rear detector unit detects72
Close to or up setting processing temperature T0Afterwards, the real time temperature T that preceding detector unit detects71Examined with rear detector unit
The real time temperature T measured72Deviation be present.
Described heating furnace is electric furnace, and electric furnace output power includes following several ways：
(1) controlled using contactor break-make mode, and passage time ratio-dependent power output；
(2) controlled using silicon control zero-cross, PWM mode uniformly exchanges break-make ratio determination power output or to electronic current
The directly filtering of transformer current signal obtains current signal, is multiplied by corresponding phase voltage, obtains three phase power respectively, then sum to obtain
General power；
(3) electric current is obtained using phase shift system control controllable silicon, the directly filtering of collection electronic current transducer current signal
Signal, corresponding phase voltage is multiplied by, obtains three phase power respectively, then sum to obtain general power；
(4) using linear accurate phase shift system control controllable silicon, power P is AC current-voltage product, is linearized
Processing, obtains θ=F (P) linearization equations, and the directly filtering of collection electronic current transducer current signal obtains current signal, multiplied
Upper corresponding phase voltage, obtains three phase power, then sum to obtain general power respectively.
It is also possible that the heating furnace is gas furnace, gas horsepower control uses following two modes：
(1) break-make burning gases mode of heating：Typically leave ever-burning flame to ignite, pass through make-and-break time ratio and control heating
Power, acquisition control time scale, power output is obtained, when accurate, also to ensure bleed pressure factor；
(2) combustion gas flow mode is adjusted：Detection calculates gas flow quality, obtains power output.
It is additionally provided with surface temperature and other furnace inner spaces point temperature that the detection of inspection temperature sensor is heated workpiece.
The present invention additionally provides a kind of heat-treatment furnace zero-time holding control for realizing heat-treatment furnace zero-time holding control method simultaneously
System, including temperature detecting module, power control unit, heater power detection module；The heater installed in heating furnace,
Heated workpiece, detector unit, temperature detecting module are realized to the temperature in electric furnace by detector unit
Detected；Described detector unit comprises at least the preceding detector unit close to heater and the rear temperature close to workpiece
Spend detecting element.
Further, described preceding detector unit and rear detector unit are arranged on the same of heat flow direction
On straight line, rear detector unit can be one or more, preferred amount is 2~4.
Heater, preceding detector unit, rear detector unit and the center of workpiece or heating furnace lumen centers are same
On one straight line.
Different heat flow directions sets multigroup preceding detector unit, rear temperature detection member respectively in heating furnace
Part.
Using the heat-treatment furnace zero-time holding control method and its device of the present invention, the inside temperature of workpiece can be detected in time
Degree, the error of observed temperature and " zero-time holding " target temperature can≤1 DEG C, prevent from burning impermeable and " burning ", shorten soaking time,
The energy is saved, reduces processing cost, improves product quality.
Brief description of the drawings
Fig. 1 is the detecting element arrangement schematic diagram of the present invention；
Fig. 2 is the temperature and heating power curve schematic diagram of each test point；
Fig. 3 is the control figure of this electric furnace；
Shown in figure：Host computer 1, slave computer 2, temperature detecting module 21, power control unit 22, detecting voltage by three phase mould
Block 23, three-phase current detection module 24, inspection thermal module 25, heater power detection module 26, heating furnace 3, workpiece 4, work(
Rate executive component 5, heater 6, preceding detector unit 71, rear detector unit 72, inspection temperature sensor 73.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
The heat-treatment furnace zero-time holding control system of the present invention, including temperature detecting module 21, power control unit 22, heating
Device power detection module 26.Temperature detecting module 21 is realized by detector unit and the temperature in electric furnace 3 is examined
Survey, heater power detection module 26 detects to the power output of heater 6, and power control unit 22 is to heater 6
Power output is controlled.
As shown in figure 1, installing having heaters 3 in heating furnace 6, heated workpiece 4 is placed in heating furnace 3.It is described
Temperature detecting module 21 is realized to the temperature in electric furnace 3 by least two detector units in heating furnace 3
Degree is detected.Detector unit comprises at least the preceding detector unit 71 close to heater 6 and the rear temperature close to workpiece 4
Spend detecting element 72.Because heat conduction direction is from heater 6 to heated workpiece 4, therefore preceding detector unit 71 is detected
The temperature T arrived71In the temperature-rise period of workpiece 4, the temperature T that rear detector unit 72 detects will be above72, its heating curve
As shown in Figure 2.
As shown in Fig. 2 passing through heat time t0Afterwards, the temperature T at preceding detector unit 7171Setting is reached
It is heat-treated heating-up temperature T0, and because the internal temperature of workpiece 4 is also not up to T0, therefore workpiece 4 still in heat absorption the temperature rise period,
Heat in heating furnace 3 flows to workpiece 4, after the temperature T that detects of detector unit 7272Also just also it is not reaching to
T0。
Passing through heat time t1Afterwards, the temperature T that rear detector unit 72 detects72Close to or up T0, illustrate to add
Temperature substantially constant in hot stove 3, heat no longer flow, i.e., workpiece 4 no longer absorbs heat, and its internal temperature should reach design temperature
T0.But because workpiece 4 there may be hysteresis and error affected by environment, the internal temperature of workpiece 4 in actual temperature-rise period
Whether the design temperature T of heat treatment is truly reached0, it is also necessary to it is further to examine and examine, therefore present invention also offers heat
Treatment furnace zero-time holding control method.
Because preceding detector unit 71 and rear detector unit 72 need to detect heat flow condition, therefore should set
Put on the same straight line of heat flow direction, as shown in figure 1, by preceding detector unit 71, the structure of rear detector unit 72
Into one group of detecting element and heater 6, the center of workpiece 4 on the same line, it is more or center is not easy really in the quantity of workpiece 4
Regularly, preceding detector unit 71, rear detector unit 72, heater 6 and heating furnace lumen centers are on the same line.Before
Detector unit 71 and rear detector unit 72 can use " a kind of thermocouple " such as the patent No. 201420618854.1,
This spline structure is more compact and effect is more preferable.
Also for improving more accurately testing result, rear detector unit can be with multiple segmentations in one group of detecting element
Arrangement, as shown in left side in Fig. 1, temperature after also setting up one between preceding detector unit 71, rear detector unit 72
Detecting element 72a.The preferred amount of detector unit 72 is 2~4 afterwards.Heating furnace 3 is larger or heat treatment of workpieces temperature will
When asking high, in order to improve detection and control accuracy, different heat flow directions sets multigroup preceding temperature respectively in heating furnace 3
Detecting element 71, rear detector unit 72, as shown in figure 1, temperature is examined before one group is respectively provided with left and right sides of workpiece
Survey element 71, rear detector unit 72.
The heat-treatment furnace zero-time holding control method of the present invention is as follows：
A, heater heating with full power is rapidly heated：Workpiece 4 is placed in heating furnace 3, heater 6 and with output work
Rate Pg exports thermal source；By preceding detector unit 71, rear detector unit 72 detects real time temperature T respectively71And T72.Institute
It is the defeated of heater 6 needed for the conventional heating with full power or controlled slope according to the formulation of workpiece heat technological requirement heats to state Pg
Go out power.
B, heater wattage output decline curve heats up：When by warm-up time tp, the temperature of workpiece 4 is close to T0When, heater
6 according to heater 6 power output decline curve P1Quantity of heat given up heated partses.
When by warm-up time t0, preceding detector unit 71, the real time temperature T detected71Reach T0；When by heating
Time t1The real time temperature T that detector unit 72 detects respectively afterwards72Also T is reached0, the power output of heater 6 progressively connects
Closely and reach steady state power P0。
C, real time temperature T is controlled71And T72In fluctuation temperature difference △ T ranges, the power output of heater 6 is detected
And control, in n Temperature Measure Control cycle TkInside meet the following power output condition of heater 6：
ΔPTKi=P0-PTKi
The temperature difference △ T and output power error X% of heater 6 are fluctuated to be set according to heat treatment of workpieces technological requirement.
It is detected simultaneously by the average output power P in each Temperature Measure Control cycle of heater 6TkiAround steady state power
P0Fluctuation up and down, in n Temperature Measure Control cycle TkInterior appearance+△ P and-△ P change, i.e., existing △ P ＞ 0, there is △ P again
＜ 0.
When meeting above-mentioned 6 power output condition of fluctuation temperature difference △ T and heater, illustrate that workpiece does not reabsorb heat, add
The hot power output P of device 60With the lost energy balance of body of heater, workpiece reaches zero-time holding state.
When fluctuation temperature difference △ T controls are at ± 0.5~5 DEG C, the power output of heater 6 misses X% controls at≤0.5~10%
Typically with regard to heat treatment requirements can be met.For the high workpiece of heat treatment requirements, fluctuation temperature difference △ T controls add at ± 0.5~2 DEG C
The hot output power error X% of device 6 controls are 0.5~2%.
Due to preceding detector unit 71, rear detector unit 72 be arranged on it is different from heater 6 and workpiece 4 away from
From, therefore, Current Temperatures detecting element real time temperature T different by the influence degree of control heater 671, rear temperature detection member
Part real time temperature T72Close to or up setting processing temperature T0, exist according to the deviation that heating furnace characteristic and technological requirement allow
Difference, but the fluctuation temperature difference △ T of preceding detector unit 7171With the fluctuation temperature difference △ T of rear detector unit 7272It all should control
System is at ± 0.5~5 DEG C.For example, because heating furnace shape, construction are different, heater performance change or workpiece shapes, putting position
Deng influence, the setting processing temperature T of preceding detector unit 7101With the setting processing temperature T of rear detector unit 7202
Deviation be present, but the requirement of temperature homogeneity and heat treatment temperature in body of heater can be met, that is to say rear detector unit
Setting of the 72 detection real time temperature close to the detection real time temperature, for example preceding detector unit 71 of preceding detector unit 71
Treatment temperature T01For 800 DEG C, the setting processing temperature T of rear detector unit 7202For 798 DEG C, but real time temperature T71And T72's
The temperature difference is fluctuated in control range, also just illustrates the heat absorption basis equalization of workpiece.
Temperature Measure Control cycle TkPreferred value：N=3~15, Tk=8~60 seconds.
Embodiment one
Heating furnace is electric furnace, as shown in figure 3, including host computer 1 and slave computer 2, the slave computer 2 is examined including temperature
Survey module 21, power control unit 22, detecting voltage by three phase module 23 and three-phase current detection module 24 and form heater power
Detection module 26；Data exchange between the host computer 1 and slave computer 2, host computer 1 can also carry out remote control.
The power control unit 22 sends signal control electricity to power executive component 5 within each temperature control cycle and added
Each heat phase device 6 of hot stove works.Each heat phase device 6 is formed in parallel by multiple heating element heaters, such as：Using multiple heater strips or
It is in parallel to heat carbon-point, the power executive component 5 can select A.C. contactor, zero passage silicon controlled module, phase shift controllable silicon to touch
Module or IGBT DC Modules are sent out, the power control unit 22 is equipped with the corresponding work of drive pattern control power executive component 5
Make.The detecting voltage by three phase module 23 detects the input voltage of each heat phase device 6；It is described according to the precision to be reached
Detecting voltage by three phase module 23 can select 10-24 A/D conversion chips, common voltage table or accurate voltage table.Described three
Phase current sensing module 24 detects the operating current of each heat phase device 6.According to the precision to be reached, the three-phase current inspection
Survey module 24, which is selected, uses 10-24 A/D conversion chips, common current table or precision ammeter.
For electric furnace, gathering three-phase voltage and electric current, determination power output, power output includes following several controls
Mode：
1st, controlled using contactor break-make mode, further passage time ratio-dependent power output.
2nd, controlled using silicon control zero-cross, PWM mode uniformly exchanges break-make ratio can be with determination power output, another kind side
Method is exactly to obtain current signal to the directly filtering of electronic current transducer current signal, is multiplied by corresponding phase voltage, obtains three respectively
Phase power, then sum to obtain general power；
3rd, controllable silicon is controlled using phase shift system, the directly filtering of collection electronic current transducer current signal obtains electric current letter
Number, corresponding phase voltage is multiplied by, obtains three phase power respectively, then sum to obtain general power；
4th, controllable silicon is controlled using linear accurate phase shift system, horse-power formula P=VI, power P is that AC current-voltage multiplies
Product, is nonlinear, after its linearization process, obtains θ=F (P) linearization equations, control furnace temperature is than simple phase shift system more
Add accurate.The directly filtering of collection electronic current transducer current signal obtains current signal, is multiplied by corresponding phase voltage, obtains respectively
Three phase power, then sum to obtain general power.
Embodiment two
When heating furnace is gas furnace, including host computer and slave computer, the slave computer include temperature detecting module, power
Control unit, gas horsepower detection module；Data exchange is carried out between the host computer and slave computer, host computer can also be carried out
Remote control.
Gas horsepower control can use following two modes：
1st, break-make burning gases mode of heating：Typically leave ever-burning flame to ignite, pass through make-and-break time ratio and control heating
Power, acquisition control time scale, power output is obtained, when accurate, also to detect bleed pressure, ensure bleed pressure factor.
2nd, combustion gas flow mode is adjusted：Detection calculates gas flow quality, obtains power output.
In above two embodiment, when heated workpiece 4 is large-scale workpiece, detected only with temperature detecting module 21
Between the furnace wall 3 of electric furnace and heated workpiece 4 along heat conduction direction 1 points of temperature, stove can't be ensured completely
Interior temperature reaches thermal balance, is heated workpiece 4 and reaches zero-time holding state, as preferred embodiment, the slave computer 2 also wraps
Inspection thermal module 25 is included, the inspection thermal module includes multi channel testing temperature sensor, each road inspection temperature sensor inspection
Survey the surface temperature and other furnace inner spaces point temperature for being heated each point on workpiece 4.No. 32 temperature sensors can at most be used
Detect the surface temperature and other furnace inner spaces point temperature of large-scale heated workpiece 4.
The host computer of the system, using PC computers, PLC, or the special single-chip microcomputer conduct of exploitation can also be used
Host computer.
Host computer and the next module 21,22,23,24,25 are selected combination to make list by the system according to user's request
One controller, realize the extraordinary controller of the principle of the invention.
Claims (14)
1. heat-treatment furnace zero-time holding control method, including heater rapid heating condition, slow temperature-rise period and insulating process；Its
It is characterised by：Its insulating process is as follows,
The real time temperature T that Current Temperatures detecting element (71) detects71Reach setting processing temperature T0, rear detector unit
(72) the real time temperature T detected72Close to or up setting processing temperature T0Afterwards, the power output of heater (6) progressively approaches
With reach steady state power P0；Wherein, described preceding detector unit (71) and rear detector unit (72) are arranged on heat
On the same straight line of flow direction；
Control real time temperature T71And T72In fluctuation temperature difference △ T ranges, the power output of heater (6) is detected and controlled
System, in n Temperature Measure Control cycle TkInside meet the power output condition of following heater (6)：
<mrow>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>P</mi>
<mrow>
<mi>T</mi>
<mi>K</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>P</mi>
<mrow>
<mi>T</mi>
<mi>K</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>+</mo>
<mo>...</mo>
<mo>+</mo>
<msub>
<mi>P</mi>
<mrow>
<mi>T</mi>
<mi>K</mi>
<mi>n</mi>
</mrow>
</msub>
</mrow>
<mi>n</mi>
</mfrac>
</mrow>
ΔPTKi=P0-PTKi
<mrow>
<mfrac>
<mrow>
<mo>|</mo>
<msub>
<mi>&Delta;P</mi>
<mrow>
<mi>T</mi>
<mi>K</mi>
<mi>i</mi>
</mrow>
</msub>
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<mi>P</mi>
<mn>0</mn>
</msub>
</mfrac>
<mo>&le;</mo>
<mi>X</mi>
<mi>%</mi>
</mrow>
It is detected simultaneously by the average output power P in each Temperature Measure Control cycle of heater (6)TkiAround steady state power P0On
Lower fluctuation；
When meeting above-mentioned fluctuation temperature difference △ T and heater (6) power output condition, workpiece reaches zero-time holding state.
2. heat-treatment furnace zero-time holding control method as claimed in claim 1, it is characterised in that fluctuation temperature difference △ T controls are ± 5
DEG C, heater (6) output power error X% is controlled≤10%.
3. heat-treatment furnace zero-time holding control method as claimed in claim 1, it is characterised in that fluctuation temperature difference △ T controls ±
0.5 DEG C, heater (6) output power error X% is controlled≤0.5%.
4. heat-treatment furnace zero-time holding control method as claimed in claim 2, it is characterised in that fluctuation temperature difference △ T controls are ± 2
DEG C, heater (6) output power error X% is controlled 0.5~2%.
5. heat-treatment furnace zero-time holding control method as claimed in claim 2, it is characterised in that fluctuation temperature difference △ T controls ±
0.5 DEG C, heater (6) output power error X% is controlled 0.5~2%.
6. the heat-treatment furnace zero-time holding control method as any one of claim 1 to 5, it is characterised in that Current Temperatures
The real time temperature T that detecting element detects71, real time temperature T that rear detector unit detects72At setting
Manage temperature T0Afterwards, the real time temperature T that preceding detector unit detects71The real time temperature T detected with rear detector unit72
Deviation be present.
7. the heat-treatment furnace zero-time holding control method as any one of claim 1 to 5, it is characterised in that heating furnace is
Electric furnace, electric furnace output power include following several ways：
(1) controlled using contactor break-make mode, and passage time ratio-dependent power output；
(2) controlled using silicon control zero-cross, PWM mode uniformly exchanges break-make ratio determination power output or to electronic current mutual inductance
The directly filtering of device current signal obtains current signal, is multiplied by corresponding phase voltage, obtains three phase power respectively, then sum to obtain total work
Rate；
(3) current signal is obtained using phase shift system control controllable silicon, the directly filtering of collection electronic current transducer current signal,
Corresponding phase voltage is multiplied by, obtains three phase power respectively, then sum to obtain general power；
(4) using linear accurate phase shift system control controllable silicon, power P is AC current-voltage product, by its linearization process,
θ=F (P) linearization equations are obtained, the directly filtering of collection electronic current transducer current signal obtains current signal, is multiplied by correspondingly
Phase voltage, three phase power is obtained respectively, then sum to obtain general power.
8. the heat-treatment furnace zero-time holding control method as any one of claim 1 to 5, it is characterised in that heating furnace is
Gas furnace, gas horsepower control use following two modes：
(1) break-make burning gases mode of heating：Typically leave ever-burning flame to ignite, pass through make-and-break time ratio and control heating work(
Rate, acquisition control time scale, power output is obtained, when accurate, also to ensure bleed pressure factor；
(2) combustion gas flow mode is adjusted：Detection calculates gas flow quality, obtains power output.
9. heat-treatment furnace zero-time holding control method as claimed in claim 1, it is characterised in that be additionally provided with inspection TEMP
Device (73) detection is heated the surface temperature and other furnace inner spaces point temperature of workpiece (4).
10. the heat-treatment furnace zero-time holding control system of heat-treatment furnace zero-time holding control method as claimed in claim 1 is realized, including
Temperature detecting module (21), power control unit (22), heater power detection module (26)；The installation in heating furnace (3)
Heater (6), heated workpiece (4), detector unit, temperature detecting module (21) pass through detector unit realization pair
Temperature in electric furnace (3) is detected；Characterized in that, described detector unit is comprised at least close to heater
(6) preceding detector unit (71) and the rear detector unit (72) close to workpiece (4)；Described preceding detector unit
(71) it is arranged on rear detector unit (72) on the same straight line of heat flow direction.
11. heat-treatment furnace zero-time holding control system as claimed in claim 10, it is characterised in that rear detector unit is 1
It is or multiple.
12. heat-treatment furnace zero-time holding control system as claimed in claim 11, it is characterised in that detector unit quantity is afterwards
2~4.
13. the heat-treatment furnace zero-time holding control system as any one of claim 10 to 12, it is characterised in that heater
(6), preceding detector unit (71), rear detector unit (72) and the center of workpiece (4) or heating furnace lumen centers are same
On one straight line.
14. heat-treatment furnace zero-time holding control system as claimed in claim 13, it is characterised in that different in heating furnace (3)
Heat flow direction sets multigroup preceding detector unit (71), rear detector unit (72) respectively.
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| KR102031815B1 (en) * | 2018-08-10 | 2019-11-11 | 브이앤씨테크 주식회사 | Temperature control apparatus and method for the industrial heater having auto-correction of soak time and self-diagnosis of abnormal heating function |
| CN110849933A (en) * | 2019-11-25 | 2020-02-28 | 王晓民 | Intelligent heating and thorough-burning detection system for heat-treated parts |
| CN113481361B (en) * | 2021-06-25 | 2023-04-07 | 中航工程集成设备有限公司 | Proportional cooling control method for heat treatment furnace of differential heating process |
| CN113625801B (en) * | 2021-09-03 | 2022-12-27 | 罗定职业技术学院 | Temperature control method of heating furnace |
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| CN1030149A (en) * | 1988-07-13 | 1989-01-04 | 铁道部成都机车车辆工厂 | Heat treatment of workpieces " zero insulation " some microcomputer control device |
| CN1160083A (en) * | 1996-03-15 | 1997-09-24 | 张龙 | Method for automatic determination and control of heating time during heat treatment |
| US6246831B1 (en) * | 1999-06-16 | 2001-06-12 | David Seitz | Fluid heating control system |
| CN102876881B (en) * | 2012-10-12 | 2014-07-09 | 首钢京唐钢铁联合有限责任公司 | Method for shortening soaking time of plain carbon steel in heating furnace |
| CN104328273A (en) * | 2014-11-24 | 2015-02-04 | 湖北江山重工有限责任公司 | Control method for temperature of thermal treatment heating furnace |
| CN205275657U (en) * | 2016-01-15 | 2016-06-01 | 成都工业学院 | Heat treating zero heat preservation control system in stove |
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