CN1827833A - Heating control method for electric carburizing furnace - Google Patents
Heating control method for electric carburizing furnace Download PDFInfo
- Publication number
- CN1827833A CN1827833A CN 200610046323 CN200610046323A CN1827833A CN 1827833 A CN1827833 A CN 1827833A CN 200610046323 CN200610046323 CN 200610046323 CN 200610046323 A CN200610046323 A CN 200610046323A CN 1827833 A CN1827833 A CN 1827833A
- Authority
- CN
- China
- Prior art keywords
- electric
- furnace
- power
- thyristor
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Control Of Resistance Heating (AREA)
- Furnace Details (AREA)
Abstract
The invention relates the carbonizing electric stove heating controlling mean. The method adopts the zero-cross triggering gate circuit transistor technology and carbonizing electric stove heating controlling mean, and the relay switch signal is replaced by the gate circuit transistor impulse signal. The gate circuit transistor receives the 0-10V or 4-20mA signal from temperature controller, then the output and input signal from zero-cross impulsion triggers gate circuit transistor to change the gate circuit transistor conducting and cut-off time to control the furnace temperature. The invention has the advantages of good economy, simple structure and easy maintenance. The invention suits to the carburizing furnace heating controlling field.
Description
Technical field
The invention belongs to electric carburizing furnace heating control technology field.
Background technology
Be used for the railway bearing surface is carried out large-scale the Equipment for Heating Processing---electric carburizing furnace of carburizing, it adds thermal actuator is to adopt thyristor unsteady flow technology, exchanges switch by thyristor and constitutes, and connects AC power and load.The electric furnace temperature signal that humidostat receives input during work sends a relay1 switch voltage signal to gate circuit transistor gate and directly triggers the thyristor conducting after amplifying, to electric furnace power supply heating.This electric furnace method for heating and controlling is actually the leakage current that utilizes the thyristor negative electrode and triggers the thyristor conducting, belongs to strong firing control.
Though this temperature control method is simple in structure, and is easy to use, cheap, temperature-controlled precision is not high, can't change the power of thermal source, does not realize the continuous adjusting to the electric furnace power input.Electric carburizing furnace heating power 560KW, when electric furnace has reached 930 ℃ of working temperatures and has been in keeping warm mode, the cold conditions part enters electric furnace and causes that furnace temperature slightly descends when only needing the small power heating, because triggering the thyristor Continuity signal is a relay1 switch voltage signal, so thyristor is 100% combined floodgate conducting, electric furnace is still exported with full power.This has not only wasted a large amount of electric energy, and high-voltage large current is frequently imported the electric furnace well heater for a long time---and electric radiant tube forms thermal shocking, has increased the weight of thermal load, thereby has reduced its work-ing life.Burn more than 20 electric radiant tube because of thermal shocking every year, because it costs an arm and a leg, change and once will cost more than 40 ten thousand yuan, and servicing time is longer, influences the quality and the output of institute's converted products.
Analyzing the major cause that produces above-mentioned phenomenon is that the electric carburizing furnace heating control technology falls behind, and adopts leakage current to trigger the thyristor conducting by force and can only carry out simple switching control to furnace temperature, can not regulate furnace temperature continuously.Can only when temperature-controlled precision, processing requirement are high, not adopt.And produce railway speed increase bearing, quasi high-speed bearing to temperature-controlled precision, production technique, what require again is very harsh.
Summary of the invention
Purpose of the present invention just provides a kind ofly has better economy, and simple in structure, very easily Wei Xiu heating control method for electric carburizing furnace.
Technical solution of the present invention is, adopts the zero passage formula to trigger the thyristor technology electric carburizing furnace is heated control mode, and the pulse signal that application can be regulated the thyristor power regulating eqiupment output of power continuously substitutes the relay1 switch signal.The effect of thyristor power regulating eqiupment is to accept 0～10V or the 4～20mA signal that the temperature controller of PID adjusting is sent here, remove to trigger thyristor from zero-crossing pulse output with the corresponding a series of zero-crossing pulses of input signal then, change thyristor conducting and dead line, it is the ratio of make-and-break time, thereby regulate the power input size of electric furnace continuously, realize the automatic control of furnace temperature.
Trigger the make-and-break time ratio that control is controlled thyristor according to the continuous voltage or the current signal of receiving instrument, outward current can change from zero to rated current continuously according to the actual needs of furnace temperature, reach continuous adjusting power output, temperature-controlled precision is not more than 1000 ℃ ± 5 ℃.But further heating control method for electric carburizing furnace has been taked the control mode of time base variable zero cross fired, but time base variable is that the cycle with alternating-current is that fundamental unit is connected several cycles with load and AC power, and then disconnect several cycles, by changing the ratio of thyristor make-and-break time in setting cycle, realize AC voltage adjusting or adjusting power.The cycle of thyristor conducting is many more in setting cycle, and the virtual value of output voltage or electric current is just big more, otherwise then more little.
Installation is through making up integrated and thyristor one base power regulating eqiupment when variable.Main power circuit adopts three-phase control biphase mode, and each control is formed AC contact-less switch by two common unidirectional thyristor inverse parallels, is connected between AC power and the electric furnace load.
Control loop is made up of power supply, synchrotrans, signal treatment circuit, triggering circuit etc., and replaces pulse transformer with optocoupler components, and matching is good, and buffer action is strong.The connection of instrument input signal and performer does not have positive and negative requirement, adopts inserting mode not have the wiring requirement between controller and the main power circuit thyristor switch.Have element overtemperature prote function and fuse disconnectedly soon, thyristor punctures and the warning function of phase shortage.Compact construction, easy for installation.
Working process is:
1. electric furnace rises to working temperature from room temperature: press the heating starting button; 4～20mA current signal that temp controlled meter is carried is transmitted in the intermediate relay adhesive; Instrument signal inserts power regulating eqiupment, and according to the power input that furnace temperature is regulated electric furnace automatically, should be full power output this moment; Thyristor triggering and conducting incoming transport power supply; The electric furnace load gets electrically heated and heats up, and this moment, the reometer indicator value should be the rated current that is heated the zone, and when heating electric carburizing furnace one district, its current value is 300A;
2. rise to 930 ℃ of working temperatures, under keeping warm mode, power regulating eqiupment only exchanges switch output 10% following regulating impulse to thyristor, and the reometer displayed value is 30A; When the cold conditions part is imported in electric furnace, furnace temperature descends 8 ℃～10 ℃, power regulating eqiupment begins continuous adjusting power output, output 50～60%, observing the reometer indicator value is 180A, meets Theoretical Calculation, illustrates that power regulating eqiupment can regulate the electric furnace power input continuously, automatically the furnace temperature modulation is risen to the working temperature of setting in short period of time, illustrate that changing heating control method for electric carburizing furnace succeeds.
The beneficial effect that the present invention reached is: but at five heating regions of electric carburizing furnace time base variable thyristor power regulating eqiupment is installed all, heating system has been simplified the one-piece construction of electrically heated performer, owing to be continuous Power Regulation, so homogeneous heating has been guaranteed the quality product of railway bearing.Stable because of the power regulating eqiupment parameters, failure rate is almost nil, also can get rid of soon even break down.Thereby guarantee the railway bearing carburizing cycle by the operation of technology beat, the while has also been saved a large amount of electric energy.
Because of but this method for heating and controlling is to adopt time base variable zero-crossing pulse triggering mode, its base with fixedly the time is compared, it is higher to control finer and smoother precision, can reduce the thermal load of heating unit, avoid thermal shocking, can prolong the work-ing life of electric radiant tube, reduce and burn number of times 60%, annual more than 40 ten thousand yuan of the buying electric radiant tube funds of just can saving of only this item.Therefore have better economy, and simple in structure, very easily maintenance.
Description of drawings
The present invention is further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is an electric carburizing furnace heating main power circuit schematic diagram of the present invention.
Fig. 2 is an electric carburizing furnace heating control circuit skeleton diagram of the present invention.
Fig. 3 is that electric carburizing furnace of the present invention adds thermal control working process skeleton diagram.
Among the figure, U, V, W are three-phase alternating-current supply; QS is an air switch, and power switch can be realized high breaking short circuit overload protection; FU is a quick-acting fuse, the protection thyristor switch; VT1, VT2, VT3, VT4 are common unidirectional thyristor, connect AC power and load; R, C are respectively resistance and electric capacity, are that capacitance-resistance absorbs holding circuit; R is the electric carburizing furnace well heater, electric radiant tube; Intermediate relay receives 4～20mA current signal of humidostat output and to the power regulating eqiupment transmission after the adhesive; But time base variable thyristor power regulating eqiupment is realized the continuous temperature adjustment of electric furnace by the control cycle; Thyristor exchanges switch, adds thermal actuator, connects AC power and load; The electric furnace load, electric radiant tube; Reometer, Power Regulation electric current output indication.
Embodiment
Installation is through making up integrated and thyristor one base power regulating eqiupment when variable.Main power circuit adopts three-phase control biphase mode, and each control is formed AC contact-less switch by two common unidirectional thyristor inverse parallels, is connected between AC power and the electric furnace load.
Control loop is made up of power supply, synchrotrans, signal treatment circuit, triggering circuit etc., and replaces pulse transformer with optocoupler components, and matching is good, and buffer action is strong.The connection of instrument input signal and performer does not have positive and negative requirement, adopts inserting mode not have the wiring requirement between controller and the main power circuit thyristor switch.Have element overtemperature prote function and fuse disconnectedly soon, thyristor punctures and the warning function of phase shortage.Compact construction, easy for installation.
Working process is:
1. electric furnace rises to working temperature from room temperature: press the heating starting button; 4～20mA current signal that temp controlled meter is carried is transmitted in the intermediate relay adhesive; Instrument signal inserts power regulating eqiupment, and according to the power input that furnace temperature is regulated electric furnace automatically, should be full power output this moment; Thyristor triggering and conducting incoming transport power supply; The electric furnace load gets electrically heated and heats up, and this moment, the reometer indicator value should be the rated current that is heated the zone, and when heating electric carburizing furnace one district, its current value is 300A;
2. rise to 930 ℃ of working temperatures, under keeping warm mode, power regulating eqiupment only exchanges switch output 10% following regulating impulse to thyristor, and the reometer displayed value is 30A; When the cold conditions part is imported in electric furnace, furnace temperature descends 8 ℃, power regulating eqiupment begins continuous adjusting power output, output 50～60%, observing the reometer indicator value is 180A, power regulating eqiupment can be regulated the electric furnace power input continuously, automatically the furnace temperature modulation is risen to the working temperature of setting in the short period of time, illustrates that changing heating control method for electric carburizing furnace succeeds.
Claims (2)
1. heating control method for electric carburizing furnace is characterized in that working process is:
A. electric furnace rises to working temperature from room temperature: press the heating starting button; 4～20mA current signal that temp controlled meter is carried is transmitted in the intermediate relay adhesive; Instrument signal inserts power regulating eqiupment, and according to the power input that furnace temperature is regulated electric furnace automatically, should be full power output this moment; Thyristor triggering and conducting incoming transport power supply; The electric furnace load gets electrically heated and heats up, and this moment, the reometer indicator value should be the rated current that is heated the zone, and when heating electric carburizing furnace one district, its current value is 300A;
B. rise to 930 ℃ of working temperatures, under keeping warm mode, power regulating eqiupment only exchanges switch output 10% following regulating impulse to thyristor, and the reometer displayed value is 30A; When the cold conditions part was imported in electric furnace, furnace temperature descended 8 ℃～10 ℃, and power regulating eqiupment begins continuous adjusting power output, output 50～60%, and observing the reometer indicator value is 180A.
2. a kind of heating control method for electric carburizing furnace according to claim 1, it is characterized in that, main power circuit adopts three-phase control biphase mode, and each control is formed AC contact-less switch by two common unidirectional thyristor inverse parallels, is connected between AC power and the electric furnace load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610046323XA CN100409133C (en) | 2006-04-13 | 2006-04-13 | Heating control method for electric carburizing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610046323XA CN100409133C (en) | 2006-04-13 | 2006-04-13 | Heating control method for electric carburizing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1827833A true CN1827833A (en) | 2006-09-06 |
| CN100409133C CN100409133C (en) | 2008-08-06 |
Family
ID=36946384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610046323XA Expired - Fee Related CN100409133C (en) | 2006-04-13 | 2006-04-13 | Heating control method for electric carburizing furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100409133C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693945B (en) * | 2009-09-29 | 2012-05-30 | 中冶南方（武汉）自动化有限公司 | Pulse combustion temperature control method of heat treating furnace |
| CN109324647A (en) * | 2018-10-17 | 2019-02-12 | 四川金星清洁能源装备股份有限公司 | A kind of heter temperature control system of natual gas dehydrate unit |
| CN115198085A (en) * | 2022-07-13 | 2022-10-18 | 北京京诚凤凰工业炉工程技术有限公司 | Electric radiant tube heating three-phase pulse control device and heat treatment furnace |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4900900A (en) * | 1987-12-24 | 1990-02-13 | Hakko Electric Co., Ltd. | Method and apparatus for controlling a-c power by means of thyristors for a resistance-type electric furnace |
| CN2112227U (en) * | 1991-12-18 | 1992-08-05 | 湖南省湘潭市整流设备厂 | Single chip computer controlled silicon controlled power regulator for controlling temp |
-
2006
- 2006-04-13 CN CNB200610046323XA patent/CN100409133C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693945B (en) * | 2009-09-29 | 2012-05-30 | 中冶南方（武汉）自动化有限公司 | Pulse combustion temperature control method of heat treating furnace |
| CN109324647A (en) * | 2018-10-17 | 2019-02-12 | 四川金星清洁能源装备股份有限公司 | A kind of heter temperature control system of natual gas dehydrate unit |
| CN115198085A (en) * | 2022-07-13 | 2022-10-18 | 北京京诚凤凰工业炉工程技术有限公司 | Electric radiant tube heating three-phase pulse control device and heat treatment furnace |
| CN115198085B (en) * | 2022-07-13 | 2024-01-30 | 北京京诚凤凰工业炉工程技术有限公司 | Three-phase pulse control device for heating electric radiant tube and heat treatment furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100409133C (en) | 2008-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206195360U (en) | A electric power storage primary control system for thermal power factory | |
| CN103743111A (en) | Liquid heating device with adjustable power | |
| CN201292954Y (en) | Water pump and/or blower fan highly effective energy-conserving control system | |
| CN1827833A (en) | Heating control method for electric carburizing furnace | |
| CN107370156A (en) | A kind of power grid frequency modulation system based on electrode boiler | |
| CN210088824U (en) | Self-adaptive adjusting device for end difference of heater of thermal power generating unit | |
| CN202419899U (en) | Electric air heater | |
| CN207907347U (en) | The setting structure of thermal substation primary side electric control valve | |
| CN207117975U (en) | A kind of electric boiler power regulating system | |
| CN109812800A (en) | The Switching Logic Control of Reheat Steam Temperature method that coal unit high-pressure heater steam extraction throttling participates in | |
| CN209512542U (en) | A kind of efficient high temperature furnace temperature-controlling system | |
| CN101570843B (en) | Method for continuously regulating wire galvanization temperature | |
| CN107529234A (en) | A kind of electric boiler power regulating system and method | |
| CN210319986U (en) | Automatic control system for high-temperature section of flue gas waste heat utilization system | |
| CN204696930U (en) | A kind of crystal heating furnace power supply | |
| CN102539191A (en) | Air-cooling cold (hot) water unit experiment device with surface-cooling coil pipe regulation function | |
| CN205893354U (en) | Orientation silicon steel heating furnace control circuit | |
| CN201121026Y (en) | Full-automatic heater | |
| CN2899034Y (en) | Automatic frequency-variable controller with energy-saving and heat-supplying functions for microcomputer | |
| Xiangqing et al. | Three-phase four-leg inverter based on current positive feedback control | |
| CN2584338Y (en) | Low-pressure sleeve welding machine | |
| CN109297079A (en) | A kind of timing voltage-regulation temperature controller for electric heating | |
| CN2387110Y (en) | Temp automatic controller of gas producer and heating furnace | |
| CN202595213U (en) | Furnace door adjusting mechanism of car-bottom type heat treatment furnace | |
| CN207663311U (en) | A kind of temperature controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20150413 |
|
| EXPY | Termination of patent right or utility model |