CN102680536B - Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply - Google Patents
Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply Download PDFInfo
- Publication number
- CN102680536B CN102680536B CN2012101906936A CN201210190693A CN102680536B CN 102680536 B CN102680536 B CN 102680536B CN 2012101906936 A CN2012101906936 A CN 2012101906936A CN 201210190693 A CN201210190693 A CN 201210190693A CN 102680536 B CN102680536 B CN 102680536B
- Authority
- CN
- China
- Prior art keywords
- molten drop
- data
- short circuit
- circuit pulse
- arc furnace
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply. The method is characterized by utilizing a silicon-controlled power supply as a power supplying power supply of a vacuum self-electricity-consumption arc furnace, and comprising the following test steps: performing voltage variation treatment on a furnace voltage signal of the vacuum self-electricity-consumption arc furnace, and then sampling at a frequency no less than 50KHz by virtue of a DSP (digital signal processor), thus obtaining sampling data; performing multi-level trapped wave treatment on sampling conversion data, and comparing the trapped wave treatment data with the set threshold one by one, thus obtaining the time of duration of a molten drop short-circuit pulse which is included in the molten drop short-circuit pulse, is continuously less than the threshold and is obtained by dividing the sampling rate by the number of sampling variation value; and outputting the sampling conversion data to a control device PLC (programmable logic controller) through a serial port. The vacuum self-electricity-consumption arc furnace molten drop test method based on the silicon-controlled power supply has the beneficial effects that the variation of the arc length is detected timely and keenly, accurate test data is provided for the subsequent molten drop control, and the compactness of high-temperature alloy smelting is ensured.
Description
Technical field
The present invention relates to a kind of vacuum consumable electrode arc furnace molten drop method of testing based on thyristor supply, be particularly useful in the very not significant remelting processing of voltage and arc length linear gradient.
Background technology
In order to guarantee the quality of Metal Melting, vacuum consumable electrode arc furnace must have highly stable reliable automatic control system.Wherein, the arc length fluctuation is to cause segregation and check underproof main cause, so the control of arc length is particularly important.At present domestic mostly is to adopt arc voltage to control the melting engineering in conjunction with the molten speed of perseverance, and this control mode is fairly simple, realize easily, but a lot of special steels or high temperature alloy, rare metal alloy be to arc voltage and insensitive, and relatively more responsive to the molten drop number.But at present ripe molten drop observation and control technology is all grasped abroad in major company such as the German ALD hand, and domestic related personnel also did Primary Study, but did not also have ripe observation and control technology to be applied to actual specialty metal melting.
Studies show that the molten drop short circuit pulse is all very responsive to subtle change and the vacuum arc disturbance of arc length, can regulate electrode speed of feed and then control arc length according to test result by the molten drop short circuit pulse is tested.This control method is more accurate than arc voltage control, can obtain excellent control effect stablizing under the melting state, obtains high-quality high temperature alloy metal material.Yet also monopolized by external major company based on the molten drop test of saturable reactor stabilized current supply and the gordian technique of control system, import price is very expensive, and does not sell independent molten drop testing apparatus substantially.And based on the molten drop observing and controlling of thyristor supply, through verification, also do not find similar techniques abroad, and generally adopt the saturable reactor power supply to implement molten drop observing and controlling.
Summary of the invention
The technical matters that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of vacuum consumable electrode arc furnace molten drop method of testing based on thyristor supply.
Technical scheme
A kind of vacuum consumable electrode arc furnace molten drop method of testing based on thyristor supply is characterized in that: adopt thyristor supply as the power supply of vacuum consumable electrode arc furnace, testing procedure is as follows:
Step 1: the furnace pressure signal of vacuum consumable electrode arc furnace is carried out transformation handles, fade to the operating voltage range of dsp processor AD module after, carry out the sampling that frequency is not less than 50KHz by dsp processor then, obtain sampled data;
Step 2: in sampling, the sample conversion data are carried out multistage trap handle;
Step 3: the data after the trap processing are compared with preset threshold one by one, data after trap is handled are given up during greater than threshold value, data after trap is handled are the start signal of molten drop short circuit pulse when occurring less than threshold value, and the data after trap is handled are the end signal of molten drop short circuit pulse when occurring greater than threshold value again; Obtain duration of this molten drop short circuit pulse with the continuous sampling transformed value number less than threshold value that comprised in the molten drop short circuit pulse divided by sampling rate, the data of handling 1 second obtain the number of molten drop short circuit pulse in 1 second and the time that each molten drop short circuit pulse is continued;
Described threshold value is half after the furnace pressure signal criterion magnitude of voltage transformation;
Step 4: with step 2 circulation 60 times, obtain the time that molten drop short circuit pulse number in one minute and each molten drop short circuit pulse are continued, and output on the opertaing device PLC by serial ports;
Step 5: repeat n time step 2, and refresh the test data that lags behind most of last one minute of equal time span with the result who repeats, the minute data after will refreshing again outputs on the opertaing device PLC by serial ports; In the melting of vacuum consumable electrode arc furnace, repeat this step and finish until the vacuum consumable electrode arc furnace melting; Described n is 5～60 times.
Beneficial effect
A kind of vacuum consumable electrode arc furnace molten drop method of testing based on thyristor supply that the present invention proposes; the method of the molten drop short circuit pulse number of test different frequency scope; correct test different frequency scope molten drop short circuit pulse is the control arc length; guarantee stablizing between arc length and the molten drop short circuit pulse rate, guarantee the important prerequisite of smelting metal quality.The molten drop method of testing is particularly useful in voltage and the very not significant remelting processing of arc length linear gradient.
The present invention has broken through the gordian technique based on the molten drop test of thyristor supply, be applied to the Metal Melting process of vacuum consumable electrode arc furnace, for the control of follow-up molten drop provides molten drop test result accurately, guarantee stablizing of arc length under the melting state stablize, guaranteed the quality of Metal Melting.At the present invention, adopt the high speed signal treatment technology simultaneously, the multiple harmonic with the output of software algorithm filtering thyristor supply can highly stablely obtain the molten drop short circuit pulse number in the different time width reliably.
The invention has the beneficial effects as follows, can in the process of the vacuum consumable electrode arc furnace system smelting metal that uses thyristor supply, detect the molten drop short circuit pulse in the different frequency scope exactly, in time detect the variation of arc length observantly, for follow-up molten drop control provides test data accurately, guaranteed the compactness of high temperature alloy melting.At thyristor supply, adopt high-speed data acquisition and real-time software algorithm that it is carried out trap and handle the multiple harmonic of its output of filtering and on-the-spot noise signal simultaneously.
Description of drawings
Fig. 1: embodiment schematic diagram
Embodiment
Now in conjunction with the embodiments, accompanying drawing is further described the present invention:
The present invention adopts thyristor supply output furnace pressure signal, generally speaking, the furnace pressure baseline is constant voltage values, when molten drop fell, resistance reduced between the both positive and negative polarity of furnace pressure, and correspondingly voltage reduces, even short circuit, form a molten drop short circuit pulse, along with the molten drop dropping process is finished, it is normal that voltage progressively recovers again.The corresponding molten drop of molten drop short circuit pulse, the frequency of the two and number are in full accord.Therefore, by detecting the situation of change of furnace pressure, can roughly calculate the molten drop number in the different frequency scope.It is characterized in that step is as follows:
Step 1: the furnace pressure signal of thyristor supply output is carried out the transformation processing, after it is faded to the operating voltage range of dsp processor AD module, send into dsp processor and carry out the high-speed sampling that frequency is not less than 50KHz, and deposit in the ping-pong buffer digital signal of sample conversion after finishing in every district's storage half second sample conversion data.
Step 2: in sampling, the data in the ping-pong buffer are handled in real time.Be one group with half second data in the ping-pong buffer, the sample conversion data carried out multistage trap handle, and the data after multistage trap finished dealing with again correspondence deposit and get back in the ping-pong buffer.Here to carry out to which order harmonics of thyristor supply output trap and handle by the influence decision of this harmonic wave to the furnace pressure signal, big as harmonic energy, big to the furnace pressure effect of signals, then must carry out trap to it and handle, otherwise, less as energy, influence very littlely, then can ignore.
Step 3: be one group with the data of depositing back in the step 2 in the ping-pong buffer half second, the data after multistage trap is handled compare with preset threshold one by one, and the threshold value here is traditionally arranged to be half after the furnace pressure signal criterion magnitude of voltage transformation.Data after handling as multistage trap are then given up greater than threshold value, and as less than threshold value, then thinking has molten drop to fall this moment, and detected is the molten drop short circuit pulse.The continuous data number less than threshold value that comprises in the statistics molten drop short circuit pulse is calculated the molten drop short circuit pulse duration according to number and sampling rate again, and this time is stored.After two and half seconds the data of ping-pong buffer of finishing dealing with, namely obtain the number of molten drop short circuit pulse in 1 second and the time that each molten drop short circuit pulse is continued.
Step 4: the process of step 3 is circulated 60 times, the molten drop short circuit pulse number in a minute that obtains was outputed on the opertaing device PLC by serial ports with the time that each molten drop short circuit pulse is continued.After this fixing number of times (being set to usually not wait to tens times several times) in the recycle, with new test to molten drop short circuit pulse number and the duration test data that lags behind most that replaces last one minute of equal time span, minute data after will refreshing again outputs on the opertaing device PLC by serial ports, and allows the process infinite loop of this refresh data go down.In whole test process, guarantee the processing time of data less than storage time, data can be handled in real time.
Specific embodiment: adopt the vacuum consumable electrode arc furnace melting tungsten manganese alloy steel of 3t, the furnace pressure reference value is 24V, and thyristor supply output fundamental frequency is 300Hz, and according to the present invention, its step process is as follows:
Step 1: the furnace pressure signal of thyristor supply output is carried out fading to 0～3V after 10: 1 transformations are handled, send into dsp processor and carry out the high-speed sampling that frequency is 50KHz, and the digital signal of sample conversion after finishing deposited in the ping-pong buffer, every district size is 25K, and each stores half second data.
Step 2: in sampling, the data in the ping-pong buffer are handled in real time.It is one group with half second data in the ping-pong buffer, at employed thyristor supply, sampled data is carried out the multistage trap of three rank (900Hz), five rank (1500Hz), nine rank (2700Hz), ten single orders (3300Hz), 15 rank (4500Hz) and 17 rank (5100Hz) and handles, and the data after multistage trap finished dealing with again correspondence deposit and get back in the ping-pong buffer.
Step 3: be one group with the data of depositing back in the step 2 in the ping-pong buffer half second, data after the multistage trap processing are compared with preset threshold one by one, the threshold value is here got half after the furnace pressure signal criterion magnitude of voltage transformation, size is 1.2V, data after handling as multistage trap are then given up greater than 1.2V, as less than 1.2V, then thinking has molten drop to fall this moment, and detected is the molten drop short circuit pulse.The continuous data number less than threshold value that comprises in the statistics molten drop short circuit pulse is calculated the molten drop short circuit pulse duration according to number and sampling rate again, and this time is stored.After two and half seconds the data of ping-pong buffer of finishing dealing with, namely obtain the number of molten drop short circuit pulse in 1 second and the time that each molten drop short circuit pulse is continued.
Step 4: the process of step 3 is circulated 60 times, the molten drop short circuit pulse number in a minute that obtains was outputed on the opertaing device PLC by serial ports with the time that each molten drop short circuit pulse is continued.After this in the recycle 5 times, with new test to 5 seconds in molten drop short circuit pulse number and duration replace in last one minute 5 seconds test datas that lag behind most, minute data after will refreshing again outputs on the opertaing device PLC by serial ports, and allows the process infinite loop of this refresh data go down.In this example the tungsten manganese alloy steel one minute build-in test to molten drop short circuit pulse number be about 32, the duration of molten drop short circuit pulse is distributed between the 0.2ms-0.6ms.In whole test process, guaranteed the processing time of data less than storage time, data can be handled in real time.
Claims (1)
1. the vacuum consumable electrode arc furnace molten drop method of testing based on thyristor supply is characterized in that: adopt controllable silicon
Power supply is as the power supply of vacuum consumable electrode arc furnace, and testing procedure is as follows:
Step 1: the furnace pressure signal of vacuum consumable electrode arc furnace is carried out transformation handles, fade to the operating voltage range of dsp processor AD module after, carry out the sampling that frequency is not less than 50KHz by dsp processor then, obtain sampled data;
Step 2: in sampling, the sample conversion data are carried out multistage trap handle;
Step 3: the data after the multistage trap processing are compared with preset threshold one by one, data after trap is handled are given up during greater than threshold value, data after trap is handled are the start signal of molten drop short circuit pulse when occurring less than threshold value, and the data after trap is handled are the end signal of molten drop short circuit pulse when occurring greater than threshold value again; Obtain duration of this molten drop short circuit pulse with the continuous sampling transformed value number less than threshold value that comprised in the molten drop short circuit pulse divided by sampling rate, the data of handling 1 second obtain the number of molten drop short circuit pulse in 1 second and the time that each molten drop short circuit pulse is continued;
Described threshold value is half after the furnace pressure signal criterion magnitude of voltage transformation;
Step 4: with step 3 circulation 60 times, obtain the time that molten drop short circuit pulse number in one minute and each molten drop short circuit pulse are continued, and output on the opertaing device PLC by serial ports;
Step 5: repeat n time step 3, and refresh the test data that lags behind most of last one minute of equal time span with the result who repeats, the minute data after will refreshing again outputs on the opertaing device PLC by serial ports; In the melting of vacuum consumable electrode arc furnace, repeat this step and finish until the vacuum consumable electrode arc furnace melting; Described n is 5～60 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101906936A CN102680536B (en) | 2012-06-11 | 2012-06-11 | Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101906936A CN102680536B (en) | 2012-06-11 | 2012-06-11 | Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102680536A CN102680536A (en) | 2012-09-19 |
| CN102680536B true CN102680536B (en) | 2013-10-09 |
Family
ID=46812789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101906936A Expired - Fee Related CN102680536B (en) | 2012-06-11 | 2012-06-11 | Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102680536B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107058756A (en) * | 2017-04-19 | 2017-08-18 | 合智熔炼装备（上海）有限公司 | A kind of method that intelligent control is carried out to molten speed by impulse waveform |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2166395Y (en) * | 1992-06-19 | 1994-05-25 | 沈阳市建通开关厂 | Electrical character testing instrument for arc furnace |
| CN1619244A (en) * | 2003-11-11 | 2005-05-25 | 伊斯帕特工业有限公司 | Method and device for determining height of smelting tank when continuously feeding cast iron in arc furnace |
| CN1900645A (en) * | 2005-07-18 | 2007-01-24 | 宝山钢铁股份有限公司 | Simulation analogue regulator for DC electric arc furnace control and protective function |
| CN101060730A (en) * | 2006-04-21 | 2007-10-24 | Abb瑞士有限公司 | Arc furnace power supply device |
| CN101228406A (en) * | 2005-07-22 | 2008-07-23 | 西门子公司 | Method for determining at lest one state parameter in electric arc furnace and electric arc furnace |
-
2012
- 2012-06-11 CN CN2012101906936A patent/CN102680536B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2166395Y (en) * | 1992-06-19 | 1994-05-25 | 沈阳市建通开关厂 | Electrical character testing instrument for arc furnace |
| CN1619244A (en) * | 2003-11-11 | 2005-05-25 | 伊斯帕特工业有限公司 | Method and device for determining height of smelting tank when continuously feeding cast iron in arc furnace |
| CN1900645A (en) * | 2005-07-18 | 2007-01-24 | 宝山钢铁股份有限公司 | Simulation analogue regulator for DC electric arc furnace control and protective function |
| CN101228406A (en) * | 2005-07-22 | 2008-07-23 | 西门子公司 | Method for determining at lest one state parameter in electric arc furnace and electric arc furnace |
| CN101060730A (en) * | 2006-04-21 | 2007-10-24 | Abb瑞士有限公司 | Arc furnace power supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102680536A (en) | 2012-09-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106363275B (en) | GTAW increasing material manufacturing process stability detection method based on executed arc voltage feedback | |
| CN105204333B (en) | A kind of energy consumption Forecasting Methodology for improving iron and steel enterprise's energy utilization rate | |
| CN102680536B (en) | Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply | |
| CN106019093B (en) | A kind of online soft sensor method of three-phawse arc furnace arc length | |
| CN103024959B (en) | Intelligent electrode regulator and intelligent electrode control method | |
| CN108265157A (en) | Intelligent arc furnace steelmaking system | |
| Khakimov et al. | Development of optimal modes and mathematical models of energy performance of electric steelmaking production | |
| CN109031045B (en) | Active power-voltage cross correlation degree island detection method based on self-adaptive threshold selection | |
| CN102707158B (en) | Method for testing molten drops of vacuum consumable electrode arc furnace based on saturable reactor stabilized current supply | |
| CN102796881B (en) | Method of accurately controlling consumable electrode remainder in electroslag remelting | |
| CN203432567U (en) | Magnetron sputtering film thickness automatic measuring and controlling device | |
| CN102382937B (en) | Electric arc furnace smelting process control method based on furnace gas analysis | |
| CN102478362A (en) | Digital temperature regulation instrument | |
| CN105970134B (en) | The apparatus and method that electric current high flux prepares metal freezing and heat treatment sample | |
| NO317186B1 (en) | Process for regulating the aluminum content of the bath in electrolysis cells in aluminum manufacture | |
| CN202380104U (en) | Pyroelectric on-line monitoring system for aluminum electrolytic cell busbar | |
| CN205195289U (en) | Distributing type reactive compensation control system | |
| TWI534574B (en) | Prediction Method of Hot Metal Temperature in Blast Furnace | |
| CN107058756A (en) | A kind of method that intelligent control is carried out to molten speed by impulse waveform | |
| CN106919049B (en) | Staged energy efficiency analysis method and optimization method for copper electrolysis process | |
| CN102816890B (en) | Automatic control method for point blowing operation of oxygen lance of oxygen top-blown converter | |
| CN104492836B (en) | A kind of electric auxiliary extraction process of Rare-Earth Tungsten | |
| CN103088369B (en) | On-line measurement method of bus current of aluminium electrolysis cell | |
| CN108491601B (en) | Submerged arc furnace smelting condition identification method and system based on arc radius fluctuation | |
| Wu et al. | Intelligent operational feedback control for fused magnesium furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Hu Shuixian Inventor after: Lv Guoyun Inventor after: Fan Yangyu Inventor after: Wang Yi Inventor before: Lv Guoyun Inventor before: Hu Shuixian Inventor before: Fan Yangyu Inventor before: Qi Min |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LV GUOYUN HU SHUIXIAN FAN YANGYU QI MIN TO: HU SHUIXIAN LV GUOYUN FAN YANGYU WANG YI |
|
| 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: 20131009 Termination date: 20150611 |
|
| EXPY | Termination of patent right or utility model |