CN106092261B - Nested liquid metal level detector - Google Patents
Nested liquid metal level detector Download PDFInfo
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- CN106092261B CN106092261B CN201610590536.2A CN201610590536A CN106092261B CN 106092261 B CN106092261 B CN 106092261B CN 201610590536 A CN201610590536 A CN 201610590536A CN 106092261 B CN106092261 B CN 106092261B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
A nested liquid metal liquid level detector is characterized in that a first cooling water pipe and a second cooling water pipe of the detector are respectively in threaded connection with a first cooling water pipe hole and a second cooling water pipe hole on a detector body, a first internal connector and a second internal connector are respectively installed in a first internal connector installation hole and a second internal connector installation hole on the detector body, a first external connector and a second external connector are respectively installed in a first external connector installation hole and a second external connector installation hole on the detector body, a central coil is installed in a central coil installation hole on the detector body, the detector is sealed by a central coil cover plate, the first detector probe and the second detector probe are respectively installed in a first detector probe installation hole and a second detector probe installation hole in the detector body through screws, and the first body cover plate and the second body cover plate are fixed on the detector body through screws.
Description
Technical Field
The invention relates to the technical field of liquid level detection in the casting process of liquid metal in the metallurgical industry, in particular to a liquid metal level detector of a crystallizer.
Background
In the existing crystallizer liquid metal liquid level height detection technology, two detection modes, namely eddy current type detection and electromagnetic coil type detection, are mainly adopted. The existing eddy current type detection device (such as German patent DE3432987A1 and Chinese patent CN 2274105A) and the electromagnetic type detection device (such as Chinese patent CN 1873382A) both adopt a single detection coil sensor to locally measure the liquid level, the accuracy of the liquid level measurement is greatly influenced by local liquid level fluctuation in the detection process, and if the sensor is damaged or is stained with liquid metal, a liquid level signal is lost, pouring and offline replacement are required to be stopped, and the continuity of casting cannot be ensured.
In the prior art, an eddy current type detection device (for example, chinese patent: CN 104061979A) using a dual eddy current sensor technology is also known, which is based on the principle that two independent sensors are combined together, and an average value of two detection signals is calculated to output a total liquid level signal. The eddy current type detection device adopting the double eddy current sensor technology enhances the detection accuracy, but if one sensor is damaged or is stained with liquid metal, a liquid level signal is lost, the casting and off-line replacement is required to be stopped, and the casting continuity cannot be ensured. And because the detection principle of the eddy current type detection sensor is to detect the change of coil impedance to reflect the liquid level height, the eddy current type detection sensor is greatly influenced by temperature and is easy to generate zero drift.
The Czech Steel design institute provides a VUHZ electromagnetic liquid metal liquid level detector, which is made of stainless steel materials, and all electric wiring and coils are concentrated in a stainless steel body. However, the detector with the structure is extremely complicated in processing and assembling, and the fault rate of the electric circuit of the detector is particularly high when the detector is used in severe environments such as high temperature, vibration, high temperature steam, multi-metal dust and the like. And moreover, because the electric wiring is concentrated in the stainless steel body, the user is inconvenient to carry out self-repairing after the fault occurs.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a nested liquid metal liquid level detector, wherein detection coils of the detector are symmetrically distributed at two sides to form a differential coil detection detector, so that the technical problems that the measurement is inaccurate by adopting a single coil, the signal fluctuation is large, and the detector is damaged and the production continuity cannot be maintained in the prior art are solved; meanwhile, the body structure of the detector is simplified, and the technical problems of high failure rate and difficult user self-repairing caused by excessive electrical wiring in the conventional metal liquid level detector are solved.
The technical scheme of the invention is as follows: the utility model provides a nested formula liquid metal level detector, includes detector body, first body apron, first condenser tube, first external plug-in components, the outer plug-in components of second, second condenser tube, second body apron, first detector probe, second detector probe, center coil apron, first inscription plug-in components and second inscription plug-in components.
The detector body is provided with a central coil mounting hole, the central coil mounting hole is positioned in the middle of the first detector probe mounting hole and the second detector probe mounting hole, a third wire guide hole is arranged between one end of the central coil mounting hole and the first external connector mounting hole, a fourth wire guide hole is arranged between the other end of the central coil mounting hole and the second external connector mounting hole, and a transverse cooling water pipe hole is arranged between the hole wall at the bottom of the first cooling water pipe hole and the hole wall at the bottom of the second cooling water pipe hole, is positioned below the central coil mounting hole and is communicated with the first detector probe mounting hole and the second detector probe mounting hole.
The first detector probe comprises a shell, a coil winding and a probe cover plate.
The shell is provided with a coil winding mounting hole and an internal plug-in mounting hole, and a wire hole is arranged between the coil winding mounting hole and the internal plug-in mounting hole.
The coil winding comprises a coil framework, a first coil, a second coil and a third coil, wherein the first coil and the second coil are wound on the excircle of the coil framework respectively, the third coil is wound at the bottom of the coil framework, and the axis of the third coil is perpendicular to and intersected with the axes of the first coil and the second coil.
The coil winding is arranged in a coil winding mounting hole of the shell, and the cover plate is arranged at the opening end of the shell through a screw.
The second detector probe and the first detector probe have the same structure.
During installation, the first cooling water pipe and the second cooling water pipe are respectively in threaded connection with the first cooling water pipe hole and the second cooling water pipe hole in the detector body.
The first inner connector and the second inner connector are respectively installed in a first inner connector installation hole and a second inner connector installation hole in the detector body.
The first external plug-in and the second external plug-in are respectively installed in a first external plug-in mounting hole and a second external plug-in mounting hole on the detector body.
The central coil is arranged in a central coil mounting hole on the detector body and is sealed by a central coil cover plate, a first coil joint of the central coil penetrates through a third wire hole on the detector body to be connected with a wire inlet end on the first external plug-in unit, and a second coil joint of the central coil penetrates through a fourth wire hole on the detector body to be connected with a wire inlet end on the first external plug-in unit.
The first detector probe and the second detector probe are respectively installed in a first detector probe installation hole and a second detector probe installation hole in the detector body through screws.
A first coil joint, a second coil joint and a third coil joint on a coil winding in the first detector probe respectively penetrate through wire holes in the shell to be connected with a wire inlet end on the first internal plug-in unit, and a wire outlet end on the first internal plug-in unit penetrates through a first wire hole in the detector body to be connected with a wire inlet end on the first external plug-in unit.
And a first coil joint, a second coil joint and a third coil joint on a coil winding in the second detector probe respectively penetrate through the wire holes on the shell to be connected with the wire inlet end on the second internal connector, and the wire outlet end on the second internal connector penetrates through the second wire hole on the detector body to be connected with the wire inlet end on the second external connector.
The central coil is connected in series with the first coil in the first detector probe and the first coil in the second detector probe to form the excitation signal of the whole detector.
The amplitude values of the two third coils in the first detector probe and the second detector probe are the same, the phase angles are opposite, and a global liquid level signal is output after passing through the differential amplification circuit, so that the nested liquid metal liquid level detector is not sensitive to liquid level fluctuation during detection, and the reliability of signal detection is improved.
First body apron and second body apron pass through the fix with screw on the detector body, play the effect of protection detector body, prevent that the molten metal from corroding and outside heavy object striking, play shielded effect to internal signal simultaneously, prevent external signal interference.
The central lines of the first detector probe and the second detector probe are parallel to each other, the distance is L, the ranges of eddy current signals generated by the two exciting coils are 0.5L respectively, and the liquid level range detected by the nested liquid metal liquid level detector is 1.5L.
Induced voltages of a second coil in the first detector probe and a second coil in the second detector probe are equal in magnitude, and the phase difference is 180 degrees; the third coil in the first detector probe is of the same amplitude and 180 deg. out of phase with the third coil in the second detector probe.
When the liquid level detector is used, the nested liquid metal liquid level detector is arranged at a liquid metal injection port 201 of the crystallizer 200, and the liquid level height of the liquid metal of the crystallizer is detected.
Compared with the prior art, the invention has the following characteristics:
1. the nested liquid metal liquid level detector provided by the invention adopts double detection coils which are symmetrically distributed, the amplitudes of two liquid level signals are the same, the phase angles are opposite, the two liquid level signals are input by adopting a differential amplification circuit, differential mode signals (useful signals) are amplified, common mode signals (interference signals) are eliminated, and a global liquid level signal is output, so that the nested liquid metal liquid level detector is less sensitive to liquid level fluctuation during detection, and the reliability of signal detection is improved.
2. The double-coil device is adopted for measurement, two local liquid level signals are output, and the condition that one detector is damaged or stained with liquid metal without influencing the casting continuity is guaranteed.
3. The detector main body is simple in structure, the cable is externally connected, and the double-coil signal association and the coil connection are mostly integrated in the processor, so that the processing difficulty of the detector main body is reduced, and convenience is brought to the processing and the assembly of the detector main body.
4. The weight of the nested liquid metal liquid level detector is greatly reduced compared with that of similar products, great convenience is brought to users, and meanwhile, the nested liquid metal liquid level detector is convenient for users to repair the detector after the detector breaks down.
The detailed structure of the invention is further described below in conjunction with the drawings and the detailed description.
Drawings
FIG. 1 is an overall appearance diagram of a nested liquid metal level detector;
FIG. 2 is an exploded view of the nested liquid metal level probe of FIG. 1;
FIG. 3 is a schematic view of the internal structure of a nested liquid metal level detector;
FIG. 4 is a schematic structural view of a probe body;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a schematic structural view of a first detector probe, the structure of a second detector probe is identical to the structure of the first detector probe, and the schematic structural view of the second detector probe is omitted;
FIG. 7 is a schematic illustration of a housing configuration for a first detector probe;
FIG. 8 is a top view of FIG. 7;
FIG. 9 is a schematic diagram of a coil winding;
FIG. 10 is a view of the position of the nested liquid metal level probe.
Detailed Description
A nested liquid metal liquid level detector comprises a detector body 1, a first body cover plate 2, a first cooling water pipe 3, a first external plug-in 4, a second external plug-in 5, a second cooling water pipe 6, a second body cover plate 7, a first detector probe 8, a second detector probe 9, a central coil 10, a central coil cover plate 11, a first internal plug-in 12 and a second internal plug-in 13.
The detector comprises a detector body 1, wherein two sides of the detector body 1 are respectively and symmetrically provided with a first cooling water pipe hole 1-1, a second cooling water pipe hole 1-9, a first detector probe mounting hole 1-2, a second detector probe mounting hole 1-10, a first inner connector mounting hole 1-3, a second inner connector mounting hole 1-11, a first outer connector mounting hole 1-4 and a second outer connector mounting hole 1-12, a first wire guide hole 1-5 is arranged between the first inner connector mounting hole 1-3 and the first outer connector mounting hole 1-4, a second wire guide hole 1-13 is arranged between the second inner connector mounting hole 1-11 and the second outer connector mounting hole 1-12, a central coil mounting hole 1-7 is arranged on the detector body 1, and the central coil mounting hole 1-7 is positioned in the first detector probe mounting hole 1-2 and the second detector probe mounting hole 1-12 In the middle of the-10, a third wire hole 1-6 is arranged between one end of a central coil mounting hole 1-7 and a first external connector mounting hole 1-4, a fourth wire hole 1-14 is arranged between the other end of the central coil mounting hole 1-7 and a second external connector mounting hole 1-12, a transverse cooling water pipe hole 1-8 is arranged between the wall of the bottom of the first cooling water pipe hole 1-1 and the wall of the bottom of the second cooling water pipe hole 1-9, and the transverse cooling water pipe hole 1-8 is positioned below the central coil mounting hole 1-7 and communicated with the first detector probe mounting hole 1-2 and the second detector probe mounting hole 1-10.
The first detector probe 8 comprises a shell 8-1, a coil winding 8-2 and a probe cover plate 8-3.
The shell 8-1 is provided with a coil winding mounting hole 8-1-1 and an internal plug-in mounting hole 8-1-2, and a wire guide hole 8-1-3 is arranged between the coil winding mounting hole 8-1-1 and the internal plug-in mounting hole 8-1-2.
The coil winding 8-2 comprises a coil framework 8-2-1, a first coil 8-2-2, a second coil 8-2-3 and a third coil 8-2-4, the first coil 8-2-2 and the second coil 8-2-3 are respectively wound on the excircle of the coil framework 8-2-1, the third coil 8-2-4 is wound at the bottom of the coil framework 8-2-1, and the axis of the third coil 8-2-4 is perpendicular to and intersected with the axes of the first coil 8-2-2 and the second coil 8-2-3.
The coil winding 8-2 is arranged in a coil winding mounting hole 8-1-1 of the shell 8-1, and the cover plate 8-3 is arranged at the opening end of the shell 8-1 through a screw.
The second detector probe 9 has the same structure as the first detector probe 8.
When the detector is installed, the first cooling water pipe 3 and the second cooling water pipe 6 are respectively in threaded connection with the first cooling water pipe hole 1-1 and the second cooling water pipe hole 1-9 on the detector body 1.
The first inner connector 12 and the second inner connector 13 are respectively arranged in the first inner connector mounting hole 1-3 and the second inner connector mounting hole 1-11 on the detector body 1.
The first external connector 4 and the second external connector 5 are respectively arranged in the first external connector mounting hole 1-4 and the second external connector mounting hole 1-12 on the detector body 1.
The central coil 10 is installed in a central coil installation hole 1-7 on the detector body 1 and is sealed by a central coil cover plate 11, a first coil joint of the central coil 10 penetrates through a third wire hole 1-6 on the detector body 1 to be connected with a wire inlet end on the first external plug-in unit 4, and a second coil joint of the central coil 10 penetrates through a fourth wire hole 1-14 on the detector body 1 to be connected with a wire inlet end on the first external plug-in unit 5.
The first detector probe 8 and the second detector probe 9 are respectively installed in a first detector probe installation hole 1-2 and a second detector probe installation hole 1-10 on the detector body 1 through screws.
A first coil 8-2-2 joint, a second coil 8-2-3 joint and a third coil 8-2-4 joint on a coil winding 8-2 in a first detector probe 8 respectively penetrate through wire holes 8-1-3 in a shell to be connected with a wire inlet end on a first internal plug-in 12, and a wire outlet end on the first internal plug-in 12 penetrates through a first wire hole 1-5 in a detector body 1 to be connected with a wire inlet end on a first external plug-in 4.
The first coil joint, the second coil joint and the third coil joint on the coil winding in the second detector probe 9 respectively pass through the wire holes on the shell to be connected with the wire inlet end on the second internal connecting plug-in 13, and the wire outlet end on the second internal connecting plug-in 13 passes through the second wire holes 1-3 on the detector body 1 to be connected with the wire inlet end on the second external connector 5.
The central coil 10 is connected in series with the first coil 8-2-2 in the first detector probe 8 and the first coil in the second detector probe 9 to form the whole detector excitation signal.
The amplitude values of the two third coils in the first detector probe 8 and the second detector probe 9 are the same, the phase angles are opposite, and a global liquid level signal is output after passing through the differential amplification circuit, so that the nested liquid metal liquid level detector is not sensitive to liquid level fluctuation during detection, and the reliability of signal detection is improved.
First body apron 2 and second body apron 7 pass through the fix with screw on detector body 1, play the effect of protection detector body 1, prevent that the molten metal from corroding and outside heavy object striking, play shielded effect to internal signal simultaneously, prevent external signal interference.
The central lines of the first detector probe 8 and the second detector probe 9 are parallel to each other, the distance is L, the ranges of eddy current signals generated by the two exciting coils are respectively 0.5L, and the liquid level range detected by the nested liquid metal liquid level detector is 1.5L.
In the embodiment, L is 400mm, the ranges of eddy current signals generated by the two exciting coils are respectively 200mm, and the liquid level range detected by the nested liquid metal level detector is 600 mm.
Induced voltages of a second coil in the first detector probe 8 and a second coil in the second detector probe 9 are equal in magnitude, and the phase difference is 180 degrees; the third coil in the first detector probe 8 is of the same amplitude and 180 deg. out of phase with the third coil in the second detector probe 9.
When the liquid level detector is used, the nested liquid metal liquid level detector is arranged at a liquid metal injection port 201 of the crystallizer 200, and the liquid level height of the liquid metal of the crystallizer is detected.
Claims (2)
1. A nested liquid metal level detector is characterized in that: the detector comprises a detector body, a first body cover plate, a first cooling water pipe, a first external plug-in unit, a second cooling water pipe, a second body cover plate, a first detector probe, a second detector probe, a central coil cover plate, a first internal plug-in unit and a second internal plug-in unit; the detector body is provided with a central coil mounting hole, the central coil mounting hole is positioned in the middle of the first detector probe mounting hole and the second detector probe mounting hole, a third wire guide hole is arranged between one end of the central coil mounting hole and the first external connector mounting hole, a fourth wire guide hole is arranged between the other end of the central coil mounting hole and the second external connector mounting hole, a transverse cooling water pipe hole is formed between the hole wall at the bottom of the first cooling water pipe hole and the hole wall at the bottom of the second cooling water pipe hole, is positioned below the central coil mounting hole and is communicated with the first detector probe mounting hole and the second detector probe mounting hole; the first detector probe comprises a shell, a coil winding and a probe cover plate; the shell is provided with a coil winding mounting hole and an internal connector mounting hole, and a wire guide hole is arranged between the coil winding mounting hole and the internal connector mounting hole; the coil winding comprises a coil framework, a first coil, a second coil and a third coil, wherein the first coil and the second coil are respectively wound on the excircle of the coil framework, the third coil is wound at the bottom of the coil framework, and the axis of the third coil is perpendicular to and intersected with the axes of the first coil and the second coil; the coil winding is arranged in a coil winding mounting hole of the shell, and the cover plate is arranged at the opening end of the shell through a screw; the second detector probe and the first detector probe have the same structure; when the detector is installed, the first cooling water pipe and the second cooling water pipe are respectively in threaded connection with the first cooling water pipe hole and the second cooling water pipe hole in the detector body; the first internal connector and the second internal connector are respectively arranged in a first internal connector mounting hole and a second internal connector mounting hole on the detector body; the first external plug-in and the second external plug-in are respectively arranged in a first external plug-in mounting hole and a second external plug-in mounting hole on the detector body; the central coil is arranged in a central coil mounting hole on the detector body and is sealed by a central coil cover plate, a first coil joint of the central coil penetrates through a third wire hole on the detector body to be connected with a wire inlet end on the first external plug-in unit, and a second coil joint of the central coil penetrates through a fourth wire hole on the detector body to be connected with a wire inlet end on the first external plug-in unit; the first detector probe and the second detector probe are respectively installed in a first detector probe installation hole and a second detector probe installation hole in the detector body through screws; a first coil joint, a second coil joint and a third coil joint on a coil winding in the first detector probe respectively penetrate through wire holes in the shell to be connected with a wire inlet end on the first internal plug-in unit, and a wire outlet end on the first internal plug-in unit penetrates through a first wire hole in the detector body to be connected with a wire inlet end on the first external plug-in unit; a first coil joint, a second coil joint and a third coil joint on a coil winding in the second detector probe respectively penetrate through wire holes in the shell to be connected with a wire inlet end on a second internal connector, and a wire outlet end on the second internal connector penetrates through a second wire hole in the detector body to be connected with a wire inlet end on a second external connector; the central coil is connected with a first coil in the first detector probe and a first coil in the second detector probe in series to form an excitation signal of the whole detector; the first body cover plate and the second body cover plate are fixed on the detector body through screws;
The distance L between the central lines of the first detector probe and the second detector probe is 400mm, the ranges of eddy current signals generated by the two exciting coils are respectively 200mm, and the liquid level range detected by the nested liquid metal liquid level detector is 600 mm.
2. A nested liquid metal level probe as claimed in claim 1 wherein: when a second coil in the first detector probe and a second coil in the second detector probe work, the induced voltages of the two coils are equal in magnitude and have a phase difference of 180 degrees; the two third coils in the first and second detector probes are of the same amplitude and opposite phase angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610590536.2A CN106092261B (en) | 2016-07-26 | 2016-07-26 | Nested liquid metal level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610590536.2A CN106092261B (en) | 2016-07-26 | 2016-07-26 | Nested liquid metal level detector |
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| Publication Number | Publication Date |
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| CN106092261A CN106092261A (en) | 2016-11-09 |
| CN106092261B true CN106092261B (en) | 2022-07-29 |
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| CN201610590536.2A Active CN106092261B (en) | 2016-07-26 | 2016-07-26 | Nested liquid metal level detector |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5311870B2 (en) * | 1971-09-30 | 1978-04-25 | ||
| JPS61221620A (en) * | 1985-03-27 | 1986-10-02 | Sumitomo Metal Ind Ltd | Coil cooling device for electromagnetic level gauge for molten metal in mold |
| FR2945118B1 (en) * | 2009-04-29 | 2011-06-17 | Avemis | SENSOR AND METHOD FOR MEASURING THE LEVEL OF THE SURFACE OF A LIQUID PHASE METAL |
| JP2011177724A (en) * | 2010-02-26 | 2011-09-15 | Aisin Seiki Co Ltd | Eddy-current-type molten metal level detector |
| CN105318935A (en) * | 2015-12-04 | 2016-02-10 | 中国原子能科学研究院 | Wide-range mutual-induction type liquid metal liquidometer |
| CN205843763U (en) * | 2016-07-26 | 2016-12-28 | 罗燕 | Nested type liquid metals level sensor |
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2016
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Effective date of registration: 20220802 Address after: 430000 room 603, building 23, Gezhouba Sun City, No. 40, Gaoxin Fourth Road, Donghu New Technology Development Zone, Wuhan, Hubei Province (Wuhan area, free trade zone) Patentee after: Hubei Daxing Technology Co.,Ltd. Address before: 421001 Room 201, building 5, Junxin Mingdi, No. 66 Baiyun Road, Zhengxiang District, Hengyang City, Hunan Province Patentee before: Luo Yan |
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