CN102818652A - Temperature online monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection and method - Google Patents
Temperature online monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection and method Download PDFInfo
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- CN102818652A CN102818652A CN201210291479XA CN201210291479A CN102818652A CN 102818652 A CN102818652 A CN 102818652A CN 201210291479X A CN201210291479X A CN 201210291479XA CN 201210291479 A CN201210291479 A CN 201210291479A CN 102818652 A CN102818652 A CN 102818652A
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Abstract
The invention belongs to the technical field of online monitoring of temperature of liquid aluminum in an aluminum ladle after vacuum aluminum discharge, and particularly relates to a temperature online monitoring system for liquid aluminum in the aluminum ladle based on acoustic temperature detection and a method. A sound wave conduit, an electric loudspeaker and a microphone are arranged in the same vertical section in the middle of both sides of the aluminum ladle. The electric loudspeaker sends a sound signal which is transmitted to the aluminum ladle by the sound wave conduit and penetrates through the liquid aluminum. The sound signal is received by the microphone and converted into a voltage signal which is input to a signal conditioner through a cable and enters a data collecting card from a junction box to be converted into a digital signal so as to calculate a sound wave flying time and finally calculate the temperature of the liquid aluminum in the aluminum ladle. According to the temperature online monitoring system for the liquid aluminum in the aluminum ladle based on acoustic temperature detection and the method provided by the invention, the continuously changing temperature of liquid aluminum can be truly reflected so that the inner quality of cast aluminum is improved. The system is not affected by severe environment such as high temperature of aluminum ladle, strong corrosion of liquid aluminum and dust, and can be remotely operated to the benefit of controlling and saving labor. Meanwhile, injury of operators caused by field temperature detection can be avoided.
Description
Technical field
The invention belongs to vacuum and go out behind the aluminium aluminium coolant-temperature gage on-line monitoring technique field in the aluminium bag, particularly a kind of based on aluminium coolant-temperature gage on-line monitoring system and method in the aluminium bag of acoustic thermometry.
Background technology
Accurately the aluminium coolant-temperature gage can play the effect that improves its inherent quality to cast aluminium in the MEASUREMENT OF Al bag, and therefore the measurement to aluminium coolant-temperature gage in the aluminium bag is crucial.But aluminium water typical temperature is high in the aluminium bag, has severe corrosive, and the work under bad environment of aluminium bag, so the metering system of aluminium coolant-temperature gage in the aluminium bag is had very high requirement.
Current metering system to the aluminium coolant-temperature gage mainly contains contact and contactless two kinds.Thermocouple temperature measurement method (contact) is to carry out thermometric in the artificial temperature probe insertion aluminium bag with thermopair; But there is following shortcoming in this method: at first; Because the temperature of aluminium water is very high, when operating personnel injured because of splashing of aluminium water easily when inserting thermopair; Secondly, inserting probe because of manual work can make temperature-measuring results fluctuation occur because of the difference of the depth.In addition, because aluminium water has corrosive attack to temperature probe, it can only come the temperature of measuring interval time through the method that deflection type point is surveyed, and can not obtain continually varying aluminium coolant-temperature gage, and need change a large amount of thermopairs, and cost is higher.Infrared thermometer is to survey aluminium coolant-temperature gage instrument eaily at present; Yet it can only obtain the temperature of aluminium water surface; Receive aluminium water surface impurities simultaneously, by the influence of flue dust steam in the thermometric environment, it measures the temperature obtained is not real aluminium coolant-temperature gage, temperature measurement error is bigger.
Summary of the invention
Not enough to prior art, the invention provides a kind of based on aluminium coolant-temperature gage on-line monitoring system and method in the aluminium bag of acoustic thermometry.
A kind of based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry; It is characterized in that: 2 acoustic waveguide tubes are installed through the flange symmetry by this system on the same vertical section of column type aluminium bag two middle side parts; 1 microphone is set respectively on 2 acoustic waveguide tubes, and 2 acoustic waveguide tubes are connected with 1 dynamic loudspeaker respectively; Signal conditioner links to each other with terminal box with 2 microphones respectively, and power amplifier links to each other with terminal box with 2 dynamic loudspeakers respectively, and terminal box links to each other with sound card with the double channel data acquisition card respectively, and the double channel data acquisition card links to each other with main frame respectively with sound card.
A kind of monitoring method based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry is characterized in that the concrete steps of this method are following:
Send instruction by main frame, import terminal box into through sound card, instruction is through behind the power amplifier, received and sent acoustical signal by dynamic loudspeaker, and acoustical signal is imported in the aluminium bag via acoustic waveguide tube; Acoustical signal is received by microphone after penetrating the aluminium bag and is transformed into voltage signal; Voltage signal is the input signal conditioner again; Get into twin-channel data collecting card and convert digital signal entering main frame to through terminal box; Main frame carries out estimating based on the broad sense simple crosscorrelation time delay of maximum likelihood through the signal of software with two passages, obtains sound wave degree of flying time τ; Utilize software in the distance L of measuring under the situation of aluminium bag cold conditions between two monitoring points, aluminium bag cross section, go out the temperature t of aluminium water in the aluminium bag again through software for calculation substitution calculation of parameter;
Sound wave degree of flying time τ utilizes Labview software institute written program to carry out simple crosscorrelation through the signal of two passages that main frame is received; The weighting function
through maximum likelihood wherein; Signal is handled, obtained accurate sound wave degree of flying time τ;
In the formula: G
X12(f) be the coherence spectra function of two channel signals; γ
12(f) be mould square coherence function;
Sound wave is when the aluminium water transmission; Deriving the velocity of propagation of sound wave in liquid medium according to the equation of state of the equation of motion, continuity equation and the liquid medium of plane wave is the function of this liquid medium, and promptly the relation of acoustic wave propagation velocity and liquid medium temperature does
In the formula: c is the velocity of propagation of sound wave in the liquid medium, and unit is m/s; L is the distance between the monitoring point arranged, aluminium bag both sides, and unit is m; τ is that sound wave flies over the time, and unit is s; ρ is the density of liquid medium, and unit is kg/m
3, t is the medial temperature of liquid medium, unit is ℃; β
sAdiabatic volume compressibility coefficient for liquid medium; K is other physical parameter of liquid medium; For given liquid medium, Z is a constant; Derive by following formula, draw the temperature calculation formula and do
According to following formula, arrange distance L and sound wave between the monitoring point time τ that flies over through measuring aluminium bag both sides, calculate the temperature t of aluminium water.
Beneficial effect of the present invention is:
The present invention can truly reflect continually varying aluminium coolant-temperature gage; Thereby improve the inherent quality of cast aluminium; And do not receive the influence of rugged surroundings such as aluminium bag high temperature, aluminium water severe corrosive and flue dust; And can operated from a distance, help control and save the labour, avoid operating personnel to cause the generation of injured situation because of on-the-spot thermometric simultaneously.
Description of drawings
Fig. 1 is an aluminium coolant-temperature gage on-line monitoring point arrangenent diagram in the aluminium bag;
Fig. 2 is a kind of based on aluminium coolant-temperature gage on-line monitoring system structural representation in the aluminium bag of acoustic thermometry;
Label among the figure: 1-first on-line monitoring point; 2-second on-line monitoring point; The 3-dynamic loudspeaker; The 4-acoustic waveguide tube; The 5-ladle; The transaudient box of 6-; The 7-signal conditioner; The 8-terminal box; The 9-power amplifier; 10-double channel data acquisition card; The 11-main frame; The 12-sound card.
Embodiment
The invention provides a kind ofly, the present invention is further specified below in conjunction with accompanying drawing and embodiment based on aluminium coolant-temperature gage on-line monitoring system and method in the aluminium bag of acoustic thermometry.
A kind of based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry; It is characterized in that: 2 acoustic waveguide tubes 4 are installed through the flange symmetry by this system on the same vertical section of 5 liang of middle side parts of column type aluminium bag; 6,2 acoustic waveguide tubes 4 of 1 microphone are set respectively on 2 acoustic waveguide tubes 4 to be connected with 1 dynamic loudspeaker 3 respectively; Signal conditioner 7 links to each other with terminal box 8 with 2 microphones 6 respectively; Power amplifier 9 links to each other with terminal box 8 with 2 dynamic loudspeakers 3 respectively; Terminal box 8 links to each other with sound card 12 with double channel data acquisition card 10 respectively, and double channel data acquisition card 10 links to each other with main frame 11 respectively with sound card 12.
A kind of monitoring method based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry is characterized in that the concrete steps of this method are following:
Send instruction by main frame 11, import terminal box 8 into through sound card 12, instruction is through behind the power amplifier 9, received and sent acoustical signal by dynamic loudspeaker 3, and acoustical signal is imported in the aluminium bag 5 via acoustic waveguide tube 4; Acoustical signal is received by microphone 6 after penetrating the aluminium bag and is transformed into voltage signal; Voltage signal is input signal conditioner 7 again; Get into twin-channel data collecting card 10 and convert digital signal entering main frame 11 to through terminal box 8; Main frame 11 carries out the signal of two passages to estimate based on the broad sense simple crosscorrelation time delay of maximum likelihood through software, obtains the sound wave time τ that flies over; Utilize software in the distance L of measuring under the situation of aluminium bag cold conditions between two monitoring points, aluminium bag cross section, go out the temperature t of aluminium water in the aluminium bag again through software for calculation substitution calculation of parameter;
Sound wave degree of flying time τ utilizes Labview software institute written program to carry out simple crosscorrelation through the signal of two passages that main frame is received; The weighting function
through maximum likelihood wherein; Signal is handled, obtained accurate sound wave degree of flying time τ;
In the formula: G
X12(f) be the coherence spectra function of two channel signals; γ
12(f) be mould square coherence function;
Sound wave is when the aluminium water transmission; Deriving the velocity of propagation of sound wave in liquid medium according to the equation of state of the equation of motion, continuity equation and the liquid medium of plane wave is the function of this liquid medium, and promptly the relation of acoustic wave propagation velocity and liquid medium temperature does
In the formula: c is the velocity of propagation of sound wave in the liquid medium, and unit is m/s; L is the distance between the monitoring point arranged, aluminium bag both sides, and unit is m; τ is that sound wave flies over the time, and unit is s; ρ is the density of liquid medium, and unit is kg/m
3, t is the medial temperature of liquid medium, unit is ℃; β
sAdiabatic volume compressibility coefficient for liquid medium; K is other physical parameter of liquid medium; For given liquid medium, Z is a constant; Derive by following formula, draw the temperature calculation formula and do
According to following formula, arrange distance L and sound wave between the monitoring point time τ that flies over through measuring aluminium bag both sides, calculate the temperature t of aluminium water.
Claims (2)
1. one kind based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry; It is characterized in that: 2 acoustic waveguide tubes (4) are installed through the flange symmetry by this system on the same vertical section of column type aluminium bag (5) two middle side parts; 1 microphone (6) is set respectively on 2 acoustic waveguide tubes (4), and 2 acoustic waveguide tubes (4) are connected with 1 dynamic loudspeaker (3) respectively; Signal conditioner (7) links to each other with terminal box (8) with 2 microphones (6) respectively; Power amplifier (9) links to each other with terminal box (8) with 2 dynamic loudspeakers (3) respectively; Terminal box (8) links to each other with sound card (12) with double channel data acquisition card (10) respectively, and double channel data acquisition card (10) links to each other with main frame (11) respectively with sound card (12).
2. a kind of monitoring method based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry as claimed in claim 1 is characterized in that the concrete steps of this method are following:
Send instruction by main frame (11), import terminal box (8) into through sound card (12), instruction receives and sends acoustical signal through behind the power amplifier (9) by dynamic loudspeaker (3), and acoustical signal is imported in the aluminium bag (5) via acoustic waveguide tube (4); Acoustical signal is received by microphone (6) after penetrating the aluminium bag and is transformed into voltage signal; Voltage signal is input signal conditioner (7) again; Get into twin-channel data collecting card (10) and convert digital signal entering main frame (11) to through terminal box (8); Main frame (11) carries out estimating based on the broad sense simple crosscorrelation time delay of maximum likelihood through the signal of software with two passages, obtains sound wave degree of flying time τ; Utilize software in the distance L of measuring under the situation of aluminium bag cold conditions between two monitoring points, aluminium bag cross section, go out the temperature t of aluminium water in the aluminium bag again through software for calculation substitution calculation of parameter;
Sound wave degree of flying time τ utilizes Labview software institute written program to carry out simple crosscorrelation through the signal of two passages that main frame is received; The weighting function
through maximum likelihood wherein; Signal is handled, obtained accurate sound wave degree of flying time τ;
In the formula: G
X12(f) be the coherence spectra function of two channel signals; γ
12(f) be mould square coherence function;
Sound wave is when the aluminium water transmission; Deriving the velocity of propagation of sound wave in liquid medium according to the equation of state of the equation of motion, continuity equation and the liquid medium of plane wave is the function of this liquid medium, and promptly the relation of acoustic wave propagation velocity and liquid medium temperature is:
In the formula: c is the velocity of propagation of sound wave in the liquid medium, and unit is m/s; L is the distance between the monitoring point arranged, aluminium bag both sides, and unit is m; τ is that sound wave flies over the time, and unit is s; ρ is the density of liquid medium, and unit is kg/m
3T is the medial temperature of liquid medium, and unit is ℃; β
sAdiabatic volume compressibility coefficient for liquid medium; K is other physical parameter of liquid medium; For given liquid medium, Z is a constant; Derive by following formula, draw the temperature calculation formula and be:
According to following formula, arrange distance L and sound wave between the monitoring point time τ that flies over through measuring aluminium bag both sides, calculate the temperature t of aluminium water.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336052A (en) * | 2013-06-24 | 2013-10-02 | 华北电力大学 | Indoor relative humidity on-line monitoring system and humidity calculation method |
| CN104464855A (en) * | 2014-12-25 | 2015-03-25 | 中国科学院合肥物质科学研究院 | Liquid heavy-metal ultrasonic wave temperature measuring device based on high-frequency electromagnetic force |
| CN107917768A (en) * | 2017-10-18 | 2018-04-17 | 华北电力大学 | A kind of air themperature measuring device and method based on low-frequency sound wave |
| CN110617900A (en) * | 2019-08-16 | 2019-12-27 | 江苏大学 | Chain grate pelletizing temperature real-time measuring device and measuring method based on ultrasonic waves |
| CN113381833A (en) * | 2021-06-07 | 2021-09-10 | 南京迪泰达环境科技有限公司 | High-time-resolution sound wave frequency division multiplexing measurement method and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336052A (en) * | 2013-06-24 | 2013-10-02 | 华北电力大学 | Indoor relative humidity on-line monitoring system and humidity calculation method |
| CN103336052B (en) * | 2013-06-24 | 2015-12-23 | 华北电力大学 | A kind of indoor relative humidity on-line monitoring system and humidity computing method |
| CN104464855A (en) * | 2014-12-25 | 2015-03-25 | 中国科学院合肥物质科学研究院 | Liquid heavy-metal ultrasonic wave temperature measuring device based on high-frequency electromagnetic force |
| CN107917768A (en) * | 2017-10-18 | 2018-04-17 | 华北电力大学 | A kind of air themperature measuring device and method based on low-frequency sound wave |
| CN110617900A (en) * | 2019-08-16 | 2019-12-27 | 江苏大学 | Chain grate pelletizing temperature real-time measuring device and measuring method based on ultrasonic waves |
| CN113381833A (en) * | 2021-06-07 | 2021-09-10 | 南京迪泰达环境科技有限公司 | High-time-resolution sound wave frequency division multiplexing measurement method and device |
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Application publication date: 20121212 |