CN202770551U - On-line temperature monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection - Google Patents
On-line temperature monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection Download PDFInfo
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- CN202770551U CN202770551U CN 201220405843 CN201220405843U CN202770551U CN 202770551 U CN202770551 U CN 202770551U CN 201220405843 CN201220405843 CN 201220405843 CN 201220405843 U CN201220405843 U CN 201220405843U CN 202770551 U CN202770551 U CN 202770551U
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Abstract
The utility model belongs to the technical field of online temperature monitoring of liquid aluminum in an aluminum ladle after vacuum aluminum discharge, and particularly relates to an on-line temperature monitoring system for liquid aluminum in an aluminum ladle based on acoustic temperature detection. Sound wave conduits, electric loudspeakers and microphones are arranged in the same vertical section in the middles of two sides of the aluminum ladle. The electric loudspeakers send sound signals which are transmitted to the aluminum ladle by the sound wave conduits. After penetrating through the liquid aluminum, the sound signals are received by the microphones and converted into voltage signals which are input into a signal conditioner through a cable. The voltage signals then enter a data collecting card through a junction box and are converted into digital signals which are used for calculating out a sound wave flying time and finally calculating out the temperature of the liquid aluminum in the aluminum ladle. According to the on-line temperature monitoring system for the liquid aluminum in the aluminum ladle based on acoustic temperature detection, the continuously changing temperature of the liquid aluminum can be truly reflected so that the inner quality of cast aluminum is improved. The system is not affected by severe environments, such as the high temperature of the aluminum ladle, the strong corrosion of the liquid aluminum, and dusts, and can be remotely operated to the benefit of controlling and labor saving. Meanwhile, injury of operators caused by field temperature detection can be prevented.
Description
Technical field
The utility model belongs to behind the vacuum aluminum-discharging aluminium coolant-temperature gage on-line monitoring technique field in the aluminium bag, and is particularly a kind of based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry.
Background technology
Accurately measuring the interior aluminium coolant-temperature gage of aluminium bag and can play the effect that improves its inherent quality to cast aluminium, is very important to the measurement of aluminium coolant-temperature gage in the aluminium bag therefore.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 manually to carry out thermometric in the 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 easily injured because of splashing of aluminium water when inserting thermopair; Secondly, can make because of the difference of the depth temperature-measuring results fluctuation occur because of the artificial probe that inserts.In addition, because aluminium water has corrosive attack to temperature probe, it can only come the temperature of measuring interval time by the method that deflection type point is surveyed, and can not obtain continually varying aluminium coolant-temperature gage, and need to change a large amount of thermopairs, and cost is higher.Infrared thermometer is to survey at present eaily instrument of aluminium coolant-temperature gage, yet it can only obtain the temperature of aluminium water surface, be subjected to simultaneously aluminium water surface impurities, by the impact of flue dust steam in the thermometric environment, it measures the temperature obtain is not real aluminium coolant-temperature gage, temperature measurement error is larger.
The utility model content
Not enough for prior art, it is a kind of based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry that the utility model provides.
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: this system installs 2 acoustic waveguide tubes at the same vertical section of column type aluminium bag two middle side parts by the flange symmetry, 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.
The beneficial effects of the utility model are:
The utility model can truly reflect continually varying aluminium coolant-temperature gage, thereby improve the inherent quality of cast aluminium, and be not subjected to the impact of the rugged surroundings such as aluminium bag high temperature, aluminium water severe corrosive and flue dust, and can operated from a distance, be conducive to control and save the labour, avoid simultaneously operating personnel to cause the generation of injured situation because of on-the-spot thermometric.
Description of drawings
Fig. 1 is 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;
Number in the figure: 1-the first on-line monitoring point; 2-the 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
It is a kind of based on aluminium coolant-temperature gage on-line monitoring system in the aluminium bag of acoustic thermometry that the utility model provides, and below in conjunction with the drawings and specific embodiments the utility model is described further.
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: this system installs 2 acoustic waveguide tubes 4 at the same vertical section of 5 liang of middle side parts of column type aluminium bag by the flange symmetry, 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 the method are as follows:
Send instruction by main frame 11, import terminal box 8 into by sound card 12, instruction is by 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, enter twin-channel data collecting card 10 and convert digital signal to through terminal box 8 and enter main frame 11, main frame 11 undertakies the signal of two passages to estimate based on the broad sense simple crosscorrelation time delay of maximum likelihood by software, obtains the sound wave time τ that flies over; Utilize software in the situation that aluminium bag cold conditions is measured the distance L between two monitoring points, aluminium bag cross section, go out again the temperature t of aluminium water in the aluminium bag by software for calculation substitution calculation of parameter;
The program that the signal of two passages that sound wave degree of flying time τ receives by main frame utilizes Labview software to write is carried out simple crosscorrelation, wherein the weighting function by maximum likelihood
, signal is processed, obtain 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 namely the pass 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
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 constant; Derived by following formula, the computing formula that draws temperature is
According to following formula, arrange distance L between the monitoring point and the sound wave time τ that flies over by measuring aluminium bag both sides, calculate the temperature t of aluminium water.
Claims (1)
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: this system installs 2 acoustic waveguide tubes (4) at the same vertical section of column type aluminium bag (5) two middle side parts by the flange symmetry, 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220405843 CN202770551U (en) | 2012-08-15 | 2012-08-15 | On-line temperature monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220405843 CN202770551U (en) | 2012-08-15 | 2012-08-15 | On-line temperature monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection |
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| Publication Number | Publication Date |
|---|---|
| CN202770551U true CN202770551U (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220405843 Expired - Fee Related CN202770551U (en) | 2012-08-15 | 2012-08-15 | On-line temperature monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection |
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| CN (1) | CN202770551U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818652A (en) * | 2012-08-15 | 2012-12-12 | 华北电力大学 | Temperature online monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection and method |
-
2012
- 2012-08-15 CN CN 201220405843 patent/CN202770551U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818652A (en) * | 2012-08-15 | 2012-12-12 | 华北电力大学 | Temperature online monitoring system for liquid aluminum in aluminum ladle based on acoustic temperature detection and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130306 Termination date: 20140815 |
|
| EXPY | Termination of patent right or utility model |