CN103727994A - Electromagnetic induction molten magnesium level meter - Google Patents
Electromagnetic induction molten magnesium level meter Download PDFInfo
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- CN103727994A CN103727994A CN201310723905.7A CN201310723905A CN103727994A CN 103727994 A CN103727994 A CN 103727994A CN 201310723905 A CN201310723905 A CN 201310723905A CN 103727994 A CN103727994 A CN 103727994A
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- molten magnesium
- liquid level
- primary coil
- secondary coil
- magnesium liquid
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Abstract
The invention relates to an electromagnetic induction molten magnesium level meter comprising a pipe, a housing, and a hanging mechanism. A primary coil and a secondary coil are contained in the pipe. A circuit module is mounted inside the housing. The hanging mechanism is mounted outside the pipe. The top of the pipe is connected with the housing through a connector. Both the primary coil and the secondary coil are connected with the circuit module. The circuit module is used for comparing constant electromotive force of the primary coil to inductive electromotive force of the secondary coil, converting a comparison result into an electrical signal and outputting the electrical signal to an external PLC. The hanging mechanism is used for hanging to a wall hole of a molten magnesium container, so that the pipe enters the molten magnesium container. The electromagnetic induction molten magnesium level meter is high in detection precision, especially meets the requirements of key steps in molten magnesium level control and magnesium alloy casting pump quantitation precision, and is especially important for level control in magnesium alloy casting and cast rolling.
Description
Technical field
The present invention relates to liquid level gauge.
Background technology
Magnesium liquid contacts with airborne oxygen, water vapor, or contacts all vigorous reaction can occur with water, iron oxide, silicon dioxide, even blast.
The oxidation resistance of metal depends on the ability of passing through with surface film obstruction reactive material, that is to say the criticality coefficient depending on surface film.The size of density coefficient, depends on and the volume of oxide and the ratio of metal volume.The ratio of magnesium is 0.79, so molten magnesium is exposed in air oxidation rapidly and generates MgO, becomes porous open texture, and on metal bath surface, produces tension stress, makes further oxidation and burning of its underpart.Particularly, when temperature is during higher than 773K, oxidation rate is accelerated.When temperature surpasses fusing point, oxidation rate sharply increases, and meets oxygen and fierce oxidation occurs and burn, and emits a large amount of heats.The magnesium oxide producing due to oxidation reaction is one deck loose powdered, can not stop oxygen to spread to metal inside, and combustion boundary will extend inward from surface with quickish speed.This specific character while melting just because of magnesium alloy, so the key of magnesium alloy production technology is exactly anti-oxidation and burning.[Chen Zhenhua, Yan Hongge, Chen Jihua etc. magnesium alloy.Beijing: Chemical Industry Press, 2004] so magnesium alloy melts, smelting equipment need to be high temperature resistant, the metal material that expansion coefficient is little is made cover plate and is formed seal chamber.During magnesium alloy fusing simultaneously, pass into protection gas and completely cut off airborne oxygen, can not be oxidized, even burning.In crucible in magnesium alloy fusing just, smelting equipment, molten magnesium can not be exposed in air, but the liquid level of molten magnesium is controlled and related to again quantitatively key link accurately of fixed displacement pump and magnesium alloy casting pump in crucible, particularly in magnesium alloy cast and casting, prick liquid level and control particularly important.
The fusing of traditional magnesium alloy, the high and low liquid level of smelting equipment (or do not have crucible cover plate to be useful in molten magnesium, to add coverture by observation panel.In coverture, contain villaumite, villiaumite, easily cause partial solvent to remain in aluminium alloy and form snotter as slag, fall the source of corrosion that low-alloyed mechanical property becomes material simultaneously, affect material quality.), in the middle of production, rule of thumb can only estimate the frequency of adding magnesium alloy ingot and regulating pump motor, change rotating speed and reach control magnesium flow quantity, manual control has a lot of uncontrollable factors there is no safety guarantee, easily causes security incident.The employing ball float contact that existing magnesium alloy fusing, smelting equipment have, some employing electrode touch-types solve high and low liquid level and report to the police, it is to float over molten magnesium magnesium liquid surface that above-mentioned two kinds of liquid levels are controlled its shortcoming, and in long-time crucible, magnesium liquid scum silica frost and oxidizing slag are attached to authenticity and the correctness that liquid level is surveyed in impact above.
Summary of the invention
The object of the invention is to propose a kind of induction molten magnesium liquid level gauge, it can solve the poor problem of detection accuracy.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of induction molten magnesium liquid level gauge, it comprises that inside is equipped with the mechanism that mounts that the body of primary coil and secondary coil, inside are provided with the housing of circuit module and are arranged on described body outside, primary coil and secondary coil are all along the length direction setting of described body, the base seal of described body and open top, the top of body is connected with housing by a coupling arrangement, and primary coil is all connected with circuit module with secondary coil; Described circuit module, for the definite value electromotive force of primary coil and the induction electromotive force of secondary coil are compared, is converted to an electric signal by comparison result, described electric signal is exported to the PLC controller of an outside; Wherein, the value of described electric signal is positioned at a default range ability; The described mechanism that mounts, for mounting with the hole wall of a magnesium liquid container, so that described body enters in described magnesium liquid container.
Preferably, described circuit module comprises current transformer, the oscillator being connected with current transformer, the comparer being connected with secondary coil with primary coil being respectively electrically connected to city and the signal converter being connected with the output terminal of described comparer; Described current transformer, for being converted to civil power the ac signal of one preset value; Described oscillator, for receiving described ac signal and making described primary coil produce definite value electromotive force; Described comparer, for the definite value electromotive force of primary coil and the induction electromotive force of secondary coil are compared, and exports comparison result to signal converter; Described signal converter, for described comparison result is converted to an electric signal, exports described electric signal to the PLC controller of one outside.
Further preferred, described circuit module also comprises a prime amplifier, and described prime amplifier is connected between secondary coil and comparer.
Further preferred, described circuit module also comprises a regulator for the calibration of returning to zero, and described regulator is connected between comparer and signal converter.
Further preferred, described circuit module also comprises a current detector, described current detector, for respectively the electric current of the electric current of primary coil and secondary coil and predetermined current threshold value being compared, if exceed described predetermined current threshold value, is controlled the warning device work of an outside.
Preferably, two wires of mutual isolation are also installed in described body, described wire is connected with the warning device of an outside.Further preferred, described warning device is audible-visual annunciator.
Preferably, described coupling arrangement comprises clamping part and refute adapter, and the one end of refuting adapter is fixedly connected with body by clamping part, and the other end of refuting adapter is fixedly connected with housing.Further preferred, described in refute take over comprise the upper pipeline that connects successively, can bending and keep pogo barrel and the lower pipeline of the angle of described bending, lower pipeline is connected with clamping part, upper pipeline is connected with housing.
Preferably, the described mechanism that mounts comprises protection tube, upper flange and lower flange, described body is socketed in described protection tube, the top of the described protection tube protection tube flange that stretches out, and upper flange and lower flange are clamped described protection tube flange fix by bolt; Described lower flange is positioned on described hole wall.
The present invention has following beneficial effect:
Owing to adopting the mode of electromagnetic induction, liquid level is measured, magnesium liquid does not contact with coil, can improve measuring accuracy, the safety in production of pricking for magnesium alloy semi-continuous casting and continuous casting provides safeguard, reduce workman's labour intensity simultaneously, enhance productivity, improve casting rod and cast quality and the output of pricking, avoid having reduced because liquid level is difficult to control and having caused occurring excessive magnesium and leak magnesium security incident in casting rod and casting bundle process.The present invention also has the feature of easy accessibility.
Accompanying drawing explanation
Fig. 1 is the physical construction schematic diagram of the induction molten magnesium liquid level gauge of preferred embodiment of the present invention;
Fig. 2 is the A-A line cut-open view of Fig. 1;
Fig. 3 is the circuit theory diagrams of Fig. 1.
Reference numeral: 1, housing; 2, upper pipeline; 3, pogo barrel; 4, lower pipeline; 5, body; 6, protection tube; 61, protection tube flange; 7, upper flange; 8, lower flange; 9, bolt; 10, packing ring; 11, clamping part; 20, hole wall; 100, primary coil; 200, secondary coil; 300, wire.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the present invention is described further.
In conjunction with shown in Fig. 1 to Fig. 3, a kind of induction molten magnesium liquid level gauge, it comprises that inside is equipped with the housing 1 that the body 5 of primary coil 100 and secondary coil 200, inside be provided with circuit module and the mechanism that mounts that is arranged on described body 5 outsides.
Two wires 300 of mutual isolation are also installed in described body 5, and described wire 300 is connected with the warning device of housing 1 outside.The bottom of two wires 300 also should be positioned at the bottom of body 5 as far as possible, and does not contact with primary coil 100, secondary coil 200.That is, two wires 300 can be mounted on the inwall of body 5, and primary coil 100 does not contact with the inwall of body 5 with 200 of secondary coils.
Described circuit module, for the induction electromotive force of the definite value electromotive force of primary coil 100 and secondary coil 200 is compared, is converted to an electric signal by comparison result, described electric signal is exported to the PLC controller (figure does not draw) of an outside.Wherein, the value of described electric signal is positioned at default range ability, for example a 0-10V.Like this, PCL controller just can be changed out liquid level according to the transformational relation of pre-set magnitude of voltage and liquid level.
Concrete, described circuit module comprises the current transformer being electrically connected to city, the oscillator being connected with current transformer, comparer, the regulator being connected with the output terminal of described comparer, the signal converter and the current detector that are connected with described regulator.Primary coil 100 is connected with the first input end of comparer, and secondary coil 200 is connected with the second input end of comparer by a prime amplifier.Primary coil 100 is all connected with current detector with secondary coil 200.
Described current transformer, for being converted to civil power the ac signal of one preset value.
Described oscillator, for receiving described ac signal and making described primary coil produce definite value electromotive force.
Described comparer, for the definite value electromotive force of primary coil and the induction electromotive force of secondary coil are compared, and exports comparison result to signal converter.
Described signal converter, for described comparison result is converted to an electric signal, exports described electric signal to the PLC controller of one outside.Described signal converter can be realized with direct-current voltage reducing circuit.
Described regulator, for the calibration of returning to zero, to reduce outside electromagnetic interference (EMI), improves measuring accuracy.Described regulator can be realized with adjustable potentiometer.
Described current detector, for respectively the electric current of the electric current of primary coil and secondary coil and predetermined current threshold value being compared, if exceed described predetermined current threshold value, controls the warning device work of outside.Described current detector available current comparer is realized.
The warning device of the present embodiment is preferably audible-visual annunciator.
The coupling arrangement of the present embodiment comprises clamping part 11 and refutes adapter, and the one end of refuting adapter is fixedly connected with body 5 by clamping part 11, and the other end of refuting adapter is fixedly connected with housing 1.Concrete, described in refute take over comprise the upper pipeline 2 that connects successively, can bending and keep pogo barrel 3 and the lower pipeline 4 of the angle of described bending, lower pipeline 4 is connected with clamping part 11, upper pipeline 2 is connected with housing 1.
The described mechanism that mounts, for mounting with the hole wall 20 of a magnesium liquid container (figure does not draw), so that described body 5 enters in described magnesium liquid container.Concrete; the described mechanism that mounts comprises protection tube 6, upper flange 7 and lower flange 8; described body 5 is socketed in described protection tube 6, the top of the described protection tube 6 protection tube flange 61 that stretches out, and upper flange 7 and lower flange 8 are clamped described protection tube flange 61 fix by bolt 9.Described lower flange 8 is positioned on described hole wall 20.In order to protect protection tube flange 61, can between protection tube flange 61 and upper flange 7 and between protection tube flange 61 and lower flange 8, packing ring 10 be set.
The principle of the present embodiment is as follows:
When liquid level gauge induction areas contacts with molten magnesium, its electromotive force is not E1, and when having molten magnesium contact, its electromotive force is E2.Molten magnesium liquid level is calculated thus V=E1+E2, and because E1 is constant, E2 is the numerical value constantly changing, and electromotive force V value changes with liquid level actual in container.Therefore, convert standard signal (being positioned at voltage or the electric current of default range) to and export PLC controller to, PLC controller just can calculate liquid level according to standard signal.
For example, induction molten magnesium liquid level gauge is applied in the semicontinuous casting rod system of magnesium alloy.Induction molten magnesium liquid level gauge detects tundish molten magnesium liquid level, and centre is surrounded by independent heat control and the temperature thermocouple of adding, and meets magnesium liquid and can not cause magnesium liquid condensing because tundish vessel temp is low from feed pipe enters, and solidifies.By induction liquid level gauge, detect magnesium liquid liquid level in crystallizer real-time PLC controller that liquid level signal is given, PLC controller is according to actual liquid level and set liquid level comparison, comprehensive actual casting rod pulling rate and obstruction tapering, adjust the opening degree that tundish stops up, regulate the magnesium liquid in tundish to enter the flow of crystallizer, thereby guarantee the stable of the interior magnesium liquid liquid level of crystallizer.
for a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and distortion all should belong to the protection domain of the claims in the present invention within.
Claims (10)
1. an induction molten magnesium liquid level gauge, it is characterized in that, comprise that inside is equipped with the mechanism that mounts that the body of primary coil and secondary coil, inside are provided with the housing of circuit module and are arranged on described body outside, primary coil and secondary coil are all along the length direction setting of described body, the base seal of described body and open top, the top of body is connected with housing by a coupling arrangement, and primary coil is all connected with circuit module with secondary coil; Described circuit module, for the definite value electromotive force of primary coil and the induction electromotive force of secondary coil are compared, is converted to an electric signal by comparison result, described electric signal is exported to the PLC controller of an outside; Wherein, the value of described electric signal is positioned at a default range ability; The described mechanism that mounts, for mounting with the hole wall of a magnesium liquid container, so that described body enters in described magnesium liquid container.
2. induction molten magnesium liquid level gauge as claimed in claim 1, it is characterized in that, described circuit module comprises current transformer, the oscillator being connected with current transformer, the comparer being connected with secondary coil with primary coil being respectively electrically connected to city and the signal converter being connected with the output terminal of described comparer; Described current transformer, for being converted to civil power the ac signal of one preset value; Described oscillator, for receiving described ac signal and making described primary coil produce definite value electromotive force; Described comparer, for the definite value electromotive force of primary coil and the induction electromotive force of secondary coil are compared, and exports comparison result to signal converter; Described signal converter, for described comparison result is converted to an electric signal, exports described electric signal to the PLC controller of one outside.
3. induction molten magnesium liquid level gauge as claimed in claim 2, is characterized in that, described circuit module also comprises a prime amplifier, and described prime amplifier is connected between secondary coil and comparer.
4. induction molten magnesium liquid level gauge as claimed in claim 2, is characterized in that, described circuit module also comprises a regulator for the calibration of returning to zero, and described regulator is connected between comparer and signal converter.
5. induction molten magnesium liquid level gauge as claimed in claim 2, it is characterized in that, described circuit module also comprises a current detector, described current detector is for comparing the electric current of the electric current of primary coil and secondary coil and predetermined current threshold value respectively, if exceed described predetermined current threshold value, control the warning device work of an outside.
6. induction molten magnesium liquid level gauge as claimed in claim 1, is characterized in that, two wires of mutual isolation are also installed in described body, and described wire is connected with the warning device of an outside.
7. the induction molten magnesium liquid level gauge as described in claim 5 or 6, described warning device is audible-visual annunciator.
8. induction molten magnesium liquid level gauge as claimed in claim 1, is characterized in that, described coupling arrangement comprises clamping part and refute adapter, and the one end of refuting adapter is fixedly connected with body by clamping part, and the other end of refuting adapter is fixedly connected with housing.
9. induction molten magnesium liquid level gauge as claimed in claim 8, it is characterized in that, described refute take over comprise the upper pipeline that connects successively, can bending and keep pogo barrel and the lower pipeline of the angle of described bending, lower pipeline is connected with clamping part, upper pipeline is connected with housing.
10. induction molten magnesium liquid level gauge as claimed in claim 1, it is characterized in that, the described mechanism that mounts comprises protection tube, upper flange and lower flange, described body is socketed in described protection tube, the top of the described protection tube protection tube flange that stretches out, upper flange and lower flange are clamped described protection tube flange fix by bolt; Described lower flange is positioned on described hole wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723905.7A CN103727994B (en) | 2013-12-24 | 2013-12-24 | Electromagnetic induction molten magnesium level meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723905.7A CN103727994B (en) | 2013-12-24 | 2013-12-24 | Electromagnetic induction molten magnesium level meter |
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| Publication Number | Publication Date |
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| CN103727994A true CN103727994A (en) | 2014-04-16 |
| CN103727994B CN103727994B (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310723905.7A Expired - Fee Related CN103727994B (en) | 2013-12-24 | 2013-12-24 | Electromagnetic induction molten magnesium level meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105352562A (en) * | 2015-12-04 | 2016-02-24 | 中国原子能科学研究院 | Induction type servo liquid metal liquid level measurement device and method |
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| JPS61111752A (en) * | 1984-11-06 | 1986-05-29 | Nippon Steel Corp | Detection of molten steel level in continuous casting mold |
| JPS63246621A (en) * | 1987-04-01 | 1988-10-13 | Toshiba Corp | Induction type liquid level measuring apparatus |
| US6289971B1 (en) * | 1999-01-14 | 2001-09-18 | Sumitomo Heavy Industries, Ltd. | Mold level control apparatus of continuous casting facility |
| CN1318149A (en) * | 1999-07-16 | 2001-10-17 | 浦项综合制铁株式会社 | Appts. and method for measuring molten metal level in electromagnetic continuous casting |
| CN101650211A (en) * | 2009-09-15 | 2010-02-17 | 天津大学 | Method and device for measuring conductive liquid level and conductivity based on double coils |
| CN203657884U (en) * | 2013-12-24 | 2014-06-18 | 深圳市亚美联合压铸设备有限公司 | Electro-magnetic induction fusion magnesium liquidometer |
-
2013
- 2013-12-24 CN CN201310723905.7A patent/CN103727994B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61111752A (en) * | 1984-11-06 | 1986-05-29 | Nippon Steel Corp | Detection of molten steel level in continuous casting mold |
| JPS63246621A (en) * | 1987-04-01 | 1988-10-13 | Toshiba Corp | Induction type liquid level measuring apparatus |
| US6289971B1 (en) * | 1999-01-14 | 2001-09-18 | Sumitomo Heavy Industries, Ltd. | Mold level control apparatus of continuous casting facility |
| CN1318149A (en) * | 1999-07-16 | 2001-10-17 | 浦项综合制铁株式会社 | Appts. and method for measuring molten metal level in electromagnetic continuous casting |
| CN101650211A (en) * | 2009-09-15 | 2010-02-17 | 天津大学 | Method and device for measuring conductive liquid level and conductivity based on double coils |
| CN203657884U (en) * | 2013-12-24 | 2014-06-18 | 深圳市亚美联合压铸设备有限公司 | Electro-magnetic induction fusion magnesium liquidometer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105352562A (en) * | 2015-12-04 | 2016-02-24 | 中国原子能科学研究院 | Induction type servo liquid metal liquid level measurement device and method |
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Granted publication date: 20170215 Termination date: 20181224 |