CN103727994B - Electromagnetic induction molten magnesium level meter - Google Patents
Electromagnetic induction molten magnesium level meter Download PDFInfo
- Publication number
- CN103727994B CN103727994B CN201310723905.7A CN201310723905A CN103727994B CN 103727994 B CN103727994 B CN 103727994B CN 201310723905 A CN201310723905 A CN 201310723905A CN 103727994 B CN103727994 B CN 103727994B
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- China
- Prior art keywords
- molten magnesium
- liquid level
- magnesium liquid
- circuit module
- primary coil
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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 is contacted with the oxygen of in the air, vapor, or contacts with water, iron oxide, silica and all can occur acutely
Reaction, or even blast.
The oxidation resistance of metal depends on the ability passed through with skin covering of the surface obstruction reactive material that is to say, that depending on and surface
The criticality coefficient of film.The size of consistency coefficient, depends on the ratio of the volume with oxide and metal volume.The ratio of magnesium is
0.79, therefore molten magnesium exposes and can generate MgO by rapid oxidation in atmosphere, becomes porous open texture, and in molten metal
Tensile stress is produced on face so as to bottom aoxidizes further and burns.Particularly when temperature is higher than 773K, oxidation rate is accelerated.
When temperature exceedes fusing point, oxidation rate sharply increases, and meets oxygen and occurs the oxidation of fierceness to burn, releases substantial amounts of heat
Amount.Because the magnesia that oxidation reaction produces is one layer of loose powdered it is impossible to stop oxygen from spreading to metal inside, boundary of burning
Face will be extended inward from surface with quickish speed.This characteristic when melting just because of magnesium alloy, therefore magnesium alloy
The key of production technology is exactly anti-oxidation and burning.【Chen Zhenhua, Yan Hongge, Chen Jihua etc. magnesium alloy.Beijing：Chemical industry goes out
Version society, 2004】So magnesium alloy melts, smelting equipment needs are high temperature resistant, the little metal material of the coefficient of expansion makes cover plate and is formed
Seal cavity.It is passed through shielding gas during magnesium alloy fusing simultaneously to carry out completely cutting off the oxygen of in the air, will not aoxidize, or even combustion
Burn.Exactly magnesium alloy fusing, molten magnesium can not expose in atmosphere in the crucible in smelting equipment, but molten magnesium in crucible
Liquid level is the key link being related to constant displacement pump and magnesium alloy casting pump quantitative accurate again, particularly in magnesium alloy cast and
It is particularly important that upper Liquid level is pricked in casting.
Traditional magnesium alloy fusing, the high and low liquid level of smelting equipment pass through observation panel（Or there do not have crucible cover plate to be useful in be molten
Melt interpolation coverture in magnesium.Contain villaumite, villiaumite in coverture, easily cause partial solvent and remain in aluminium alloy as slag
Form field trash, drop low-alloyed mechanical property becomes the source of corrosion of material simultaneously, affects material quality.）, basis in the middle of production
Experience can only estimate the frequency added magnesium alloy ingot and adjust pump motor, change rotating speed and reach control magnesium flow quantity, manual control
There are much uncontrollable factors there is no safety guarantee, easily cause security incident.Existing magnesium alloy fusing, smelting equipment have
Employing ball float contact, have to solve high and low liquid level using electrode touching formula and reports to the police, its shortcoming of above two Liquid level
It is to float over molten magnesium magnesium liquid surface, in long-time crucible, magnesium liquid scum silica frost and oxidizing slag are attached to the authenticity that impact above detects liquid level
And correctness.
Content of the invention
It is an object of the invention to proposing a kind of induction molten magnesium liquid level gauge, it can solve asking of detection accuracy difference
Topic.
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 include accommodated inside have primary coil and secondary coil body,
Inside is provided with the housing of circuit module and is arranged on the mechanism that mounts outside described body, and primary coil and secondary coil are equal
Along length direction setting, the bottom lock of described body and the open top of described body, the top of body is passed through one and is connected dress
Put and be connected with housing, primary coil and secondary coil are all connected with circuit module；Described circuit module, for by primary coil
The induced electromotive force of definite value electromotive force and secondary coil is compared, and comparison result is converted to an electric signal, by described telecommunications
Number export the PLC outside to；Wherein, the value of described electric signal is located in a default range ability；Described mount
Mechanism, mounts for the hole wall with a magnesium liquid container, so that described body enters in described magnesium liquid container.
Preferably, described circuit module include with city electrical connection current transformer be connected with current transformer oscillator, respectively with
The comparator of primary coil and secondary coil connection and the signal adapter being connected with the output end of described comparator；Described change
Stream device, for being converted to the ac signal of a preset value by civil power；Described oscillator, for receiving described ac signal simultaneously
Described primary coil is made to produce definite value electromotive force；Described comparator, for by the definite value electromotive force of primary coil and secondary coil
Induced electromotive force compare, and comparison result is exported to signal adapter；Described signal adapter, for by described ratio
Result is converted to an electric signal, by described electric signal output to one outside PLC.
It is further preferred that described circuit module also includes a preamplifier, described preamplifier is connected to secondary
Between coil and comparator.
It is further preferred that described circuit module also include one for return to zero calibration adjuster, the connection of described adjuster
Between comparator and signal adapter.
It is further preferred that described circuit module also includes a current detector, described current detector is used for respectively to
The electric current of the electric current of primary coil and secondary coil and predetermined current threshold are compared, if exceeding described predetermined current threshold,
Then control the warning device work outside one.
Preferably, it is also equipped with mutually isolated two piece wire in described body, the warning dress outside described wire and
Put connection.It is further preferred that described warning device is audible-visual annunciator.
Preferably, described attachment means include clamping part and docking pipe, and clamping part is passed through with body admittedly in one end of docking pipe
Fixed connection, the other end of docking pipe is fixedly connected with the casing.It is further preferred that described docking pipe includes the upper pipe being sequentially connected
Road, can bending keep the pogo barrel of angle of described bending and lower pipeline, lower pipeline is connected with clamping part, upper pipeline and shell
Body connects.
Preferably, the described mechanism that mounts includes protection pipe, upper flange and lower flange, and described body is socketed in described protection pipe
Interior, the top of described protection pipe stretches out a protection pipe flange, and upper flange and lower flange pass through bolt by described protection tube method
Orchid clamps and fixes；Described lower flange is located on described hole wall.
The present invention has the advantages that：
Due to being measured to liquid level by the way of electromagnetic induction, magnesium liquid not with coil contact, certainty of measurement can be improved,
Safety in production for magnesium alloy semi-continuous casting and continuous casting bundle provides safeguard, and reduces the labour intensity of workman simultaneously, improves and produces
Efficiency, improves casting rod and casts the quality pricked and yield, it is to avoid decreases during casting rod and casting are pricked and is difficult to control to due to liquid level
Lead to overflow magnesium and leakage magnesium security incident.The present invention also has the characteristics that easy accessibility.
Brief description
Fig. 1 is the frame for movement schematic diagram of the induction molten magnesium liquid level gauge of present pre-ferred embodiments；
Fig. 2 is the line A-A sectional view of Fig. 1；
Fig. 3 is the circuit theory diagrams of Fig. 1.
Reference：1st, housing；2nd, upper pipeline；3rd, pogo barrel；4th, lower pipeline；5th, body；6th, protection pipe；61st, protect
Pipe flange；7th, upper flange；8th, lower flange；9th, bolt；10th, packing ring；11st, clamping part；20th, hole wall；100th, primary coil；200th, secondary
Level coil；300th, wire.
Specific embodiment
Below, in conjunction with accompanying drawing and specific 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 includes accommodated inside primary coil
100 and secondary coil 200 body 5, inside the housing 1 of circuit module is installed and is arranged on the extension outside described body 5
Mounting mechanism.
Primary coil 100 and secondary coil 200 are all along the length direction setting of described body 5.The bottom envelope of described body 5
Close and open top.The top of body 5 is connected with housing 1 by attachment means.Primary coil 100 and secondary coil 200 are equal
It is connected with circuit module.The bottom of primary coil 100 and secondary coil 200 is located at the bottom of body 5 as far as possible.Body 5, primary line
Circle 100 and secondary coil 200 constitute detection probe.
It is also equipped with mutually isolated two piece wire 300, the report outside described wire 300 and a housing 1 in described body 5
Alarm device connects.The bottom of two wires 300 also should be located at the bottom of body 5 as far as possible, and not with primary coil 100, secondary
Coil 200 contacts.That is, two wires 300 can be mounted on the inwall of body 5, and primary coil 100 and secondary coil 200 are then not
Contact internal walls with body 5.
Described circuit module, for entering the induced electromotive force of the definite value electromotive force of primary coil 100 and secondary coil 200
Row compare, comparison result is converted to an electric signal, by described electric signal output to one outside PLC（Figure is not drawn
Go out）.Wherein, the value of described electric signal is located in a default range ability, such as 0-10V.So, PCL controller is just permissible
Liquid level is changed out according to the transformational relation of pre-set magnitude of voltage and liquid level.
Specifically, described circuit module include with city electrical connection current transformer be connected with current transformer oscillator, compare
Signal adapter and current detecting that the adjuster that device is connected with the output end of described comparator is connected with described adjuster
Device.Primary coil 100 is connected with the first input end of comparator, and secondary coil 200 passes through a preamplifier and comparator
Second input connects.Primary coil 100 and secondary coil 200 are all connected with current detector.
Described current transformer, for being converted to the ac signal of a preset value by civil power.
Described oscillator, for receiving described ac signal and making described primary coil produce definite value electromotive force.
Described comparator, for the induced electromotive force of the definite value electromotive force of primary coil and secondary coil is compared,
And export comparison result to signal adapter.
Described signal adapter, for described comparison result is converted to an electric signal, by described electric signal output to
Outside PLC.Described signal adapter can be realized with direct-current voltage reducing circuit.
Described adjuster, for zeroing calibration, to reduce the electromagnetic interference of outside, improves certainty of measurement.Described adjuster
Available adjustable potentiometer is realized.
Described current detector, for respectively by the electric current of the electric current of primary coil and secondary coil and predetermined current threshold
Comparing, if exceeding described predetermined current threshold, controlling the warning device work of hull outside.Described current detector can
Realized with current comparator.
The warning device of the present embodiment is preferably audible-visual annunciator.
The attachment means of the present embodiment include clamping part 11 and docking pipe, and clamping part 11 and body are passed through in one end of docking pipe
5 are fixedly connected, and the other end of docking pipe is fixedly connected with housing 1.Specifically, described docking pipe includes the upper pipeline being sequentially connected
2nd, can bending keep the pogo barrel 3 of angle of described bending and lower pipeline 4, lower pipeline 4 is connected with clamping part 11, upper pipeline
2 are connected with housing 1.
Described mount mechanism, for a magnesium liquid container（Figure is not drawn into）Hole wall 20 mount, so that described body 5 enters
In described magnesium liquid container.Specifically, the described mechanism that mounts includes protection pipe 6, upper flange 7 and lower flange 8, and described body 5 is socketed
In described protection pipe 6, the top of described protection pipe 6 stretches out a protection pipe flange 61, and upper flange 7 and lower flange 8 pass through
Described protection pipe flange 61 is clamped and fixing by bolt 9.Described lower flange 8 is located on described hole wall 20.In order to protect protection pipe
Flange 61, can arrange packing ring 10 between protection pipe flange 61 and upper flange 7 and protection pipe flange 61 and lower flange 8 between.
The principle of the present embodiment is as follows：
Primary coil 100 produces alternating current by oscillator, then secondary coil 200 will be due to the presence of mutual inductance（Mutually
Sense coefficient can be changed due to the change of magnesium metal liquid level）Produce induced electromotive force, secondary circuit is closed into primary Ioops, this is electronic
The size of gesture is determined by the mutual inductance of electric current, frequency and secondary coil 200 of primary coil 100, the number of turn.In this mathematical expression
E=K*N*dB/dt.In formula, k represents mutual inductance, and N represents coil turn, and dB/dt represents the change of primary coil magnetic flux.
This electromotive force can order about electronics flowing, forms induced-current.Induced electromotive force can examined probe loop with magnesium liquid flow
Short circuit current impact, the magnesium liquid liquid level of detection probe detection also can be in company with changing.Magnesium liquid and air because of fusing
The difference of permeability, so the magnetic field passed through will change, at this moment will be with magnesium in the induced electromotive force of secondary coil 200
The rising of liquid level, decline and change.
When contact with molten magnesium when liquid level gauge induction areas, its electromotive force is E1, when having molten magnesium to contact its
Electromotive force is E2.Being calculated by this molten magnesium liquid level has V=E1+E2, and because E1 is constant, E2 is the numerical value being continually changing, electronic
Gesture V value is with actual liquid level change in container.Therefore, it is converted into standard signal（The voltage being located in default range or electricity
Stream）Export to PLC, PLC just can calculate liquid level according to standard signal.
For example, induction molten magnesium liquid level gauge is applied in magnesium alloy semicontinuous casting rod system.Induction
Molten magnesium liquid level gauge detects tundish molten magnesium liquid level, and centre is surrounded by single computer heating control and temperature thermocouple, meets magnesium liquid
Will not be low due to tundish vessel temp after feed pipe enters, cause magnesium liquid condensing, solidification.By induction liquid level gauge
Detection crystallizer in magnesium liquid liquid level and give PLC liquid level signal in real time, PLC according to actual liquid level with
Set liquid level to compare, comprehensively actual casting rod pulling rate and blocking taper, to adjust the opening degree of tundish blocking, to adjust in tundish
Magnesium liquid enter the flow of crystallizer, thus ensureing stablizing of magnesium liquid liquid level in crystallizer.
For a person skilled in the art, can technical scheme as described above and design, make other each
Plant corresponding change and deform, and all these changes and deforms the protection model that all should belong to the claims in the present invention
Within enclosing.
Claims (10)
1. a kind of induction molten magnesium liquid level gauge has primary coil and secondary coil it is characterised in that including accommodated inside
Body, inside the housing of circuit module is installed and is arranged on the mechanism that mounts described body outside, primary coil and secondary
Level coil all along length direction setting, the bottom lock of described body and the open top of described body, pass through by the top of body
One attachment means are connected with housing, and primary coil and secondary coil are all connected with circuit module；Described circuit module, for by just
The level definite value electromotive force of coil and the induced electromotive force of secondary coil are compared, and comparison result is converted to an electric signal, will
PLC outside to one for the described electric signal output；Wherein, the value of described electric signal is located in a default range ability；
Described mount mechanism, mount for the hole wall with a magnesium liquid container so that described body enter described magnesium liquid container in.
2. as claimed in claim 1 induction molten magnesium liquid level gauge it is characterised in that described circuit module includes and city
Electrical connection the current transformer oscillator being connected with current transformer, the comparator being connected with primary coil and secondary coil respectively and
The signal adapter being connected with the output end of described comparator；Described current transformer, for being converted to the friendship of a preset value by civil power
Stream electric signal；Described oscillator, for receiving described ac signal and making described primary coil produce definite value electromotive force；Described
Comparator, for comparing the induced electromotive force of the definite value electromotive force of primary coil and secondary coil, and by comparison result
Export to signal adapter；Described signal adapter, for described comparison result is converted to an electric signal, by described electric signal
Export the PLC outside to.
3. as claimed in claim 2 induction molten magnesium liquid level gauge it is characterised in that described circuit module also includes one
Preamplifier, described preamplifier is connected between secondary coil and comparator.
4. as claimed in claim 2 induction molten magnesium liquid level gauge it is characterised in that described circuit module also includes one
For the adjuster of zeroing calibration, described adjuster is connected between comparator and signal adapter.
5. as claimed in claim 2 induction molten magnesium liquid level gauge it is characterised in that described circuit module also includes one
Current detector, described current detector is used for respectively by the electric current of the electric current of primary coil and secondary coil and predetermined current threshold
Value is compared, if exceeding described predetermined current threshold, controls the warning device work outside one.
6. as claimed in claim 1 induction molten magnesium liquid level gauge it is characterised in that being also equipped with phase in described body
Mutually two wires of isolation, described wire is connected with the warning device outside.
7. the induction molten magnesium liquid level gauge as described in claim 5 or 6, described warning device is audible-visual annunciator.
8. as claimed in claim 1 induction molten magnesium liquid level gauge it is characterised in that described attachment means include clamp
Portion and docking pipe, one end of docking pipe is fixedly connected with body by clamping part, and the other end of docking pipe is fixedly connected with the casing.
9. as claimed in claim 8 induction molten magnesium liquid level gauge it is characterised in that described docking pipe includes connecting successively
The upper pipeline that connects, can bending keep the pogo barrel of angle of described bending and lower pipeline, lower pipeline is connected with clamping part, on
Pipeline is connected with housing.
10. as claimed in claim 1 induction molten magnesium liquid level gauge it is characterised in that described mount mechanism include protect
Pillar, upper flange and lower flange, described body is socketed in described protection pipe, and the top of described protection pipe stretches out a protection
Described protection pipe flange is clamped and fixes by bolt by pipe flange, upper flange and lower flange；Described lower flange is located at described hole
On 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723905.7A CN103727994B (en) | 2013-12-24 | 2013-12-24 | Electromagnetic induction molten magnesium level meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103727994A CN103727994A (en) | 2014-04-16 |
| CN103727994B true CN103727994B (en) | 2017-02-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310723905.7A Expired - Fee Related CN103727994B (en) | 2013-12-24 | 2013-12-24 | Electromagnetic induction molten magnesium level meter |
Country Status (1)
| Country | Link |
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| CN (1) | CN103727994B (en) |
Families Citing this family (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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (2)
| 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 |
-
2013
- 2013-12-24 CN CN201310723905.7A patent/CN103727994B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Publication date |
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| CN103727994A (en) | 2014-04-16 |
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Granted publication date: 20170215 Termination date: 20181224 |