CN202403763U - Metal liquid level detecting device - Google Patents
Metal liquid level detecting device Download PDFInfo
- Publication number
- CN202403763U CN202403763U CN2011204953681U CN201120495368U CN202403763U CN 202403763 U CN202403763 U CN 202403763U CN 2011204953681 U CN2011204953681 U CN 2011204953681U CN 201120495368 U CN201120495368 U CN 201120495368U CN 202403763 U CN202403763 U CN 202403763U
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- coil
- liquid level
- metal liquid
- eddy current
- compensating
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model discloses a vortex-type metal liquid level detecting device. The vortex-type metal liquid level detecting device comprises a vortex transducer, a signal cable and a signal processor, wherein the vortex transducer comprises a receiving coil, a transmitting coil and a compensating coil which are coaxially arranged in a direction from a near side to a far side of a metal liquid level sequentially; and the distance between the transmitting coil and the receiving coil is larger than that between the transmitting coil and the compensating coil. The vortex-type metal liquid level detecting device is high in sensitivity and strong in antijamming capability.
Description
Technical field
The utility model belongs to the metal liquid level detection range, is specifically related to a kind of eddy current type metal liquid level pick-up unit.
Background technology
It is the prerequisite of stable control metal liquid level that metal liquid level detects; The automatic control that realizes metal liquid level can make metal liquid level stably remain on the predetermined height; Improve the quality of strand; Reduce liquid metal and overflow or spill accident, improve caster work rate, alleviate casting personnel's labour intensity and avoided casting personnel fatigue or maloperation and the accident that causes.The eddy current type metal liquid level detects to non-contact detection, has the accuracy of detection height, can be usually used in the detection to metal liquid levels such as steel, aluminium and copper than advantages such as work under the rugged environment.The eddy current sensor coil of existing eddy current type unit for detecting liquor level of molten steel adopts the triple coil structure; CN2274105Y discloses primary coil apart from metal liquid level end farthest; Two secondary coils are in the same side of primary coil and unequal apart from the spacing of primary coil; The long poor stability of its ranging is vulnerable to external interference; Primary coil, secondary coil and the compensating coil radially coaxial layout structure that CN2318619Y discloses; Coefficient of mutual inductance between its primary coil and the secondary coil is bigger; The background signal that primary coil produces in secondary coil is higher, and sensitivity and stability are measured in influence; CN100535613C discloses transmitting coil, receiving coil and the compensating coil of mutually nested layout, the axis normal of receiving coil and transmitting coil wherein, and compensating coil is coaxial with transmitting coil.The sensor has all adopted the structure of triple coil layout, is a little less than the sensor antijamming capability but all ignored the interference that metal object especially produces sensor from sensor upper metal thing around the sensor, thereby influence the accuracy of metal liquid level detection.
Therefore, be necessary to provide the strong eddy current type metal liquid level pick-up unit of a kind of highly sensitive antijamming capability to solve the deficiency of above-mentioned eddy current type metal liquid level pick-up unit.
The utility model content
The utility model provides a kind of eddy current type metal liquid level pick-up unit; Comprise: eddy current sensor, signal cable and signal processor; Wherein, Eddy current sensor comprises receiving coil, transmitting coil and the compensating coil near to direction far away coaxial arrangement successively apart from metal liquid level, and the spacing of transmitting coil and receiving coil is greater than the spacing of transmitting coil and compensating coil.
Further, the coiling of receiving coil and compensating coil is in the opposite direction.
Further, the number of turns of receiving coil is greater than the number of turns of compensating coil.
Further, the number of turns ratio of the number of turns of receiving coil and compensating coil is between 1 to 10.
The beneficial effect of the utility model is: 1. the number of turns greater than the receiving coil of compensating coil and compensating coil system is in the opposite direction and its apart from the distance of transmitting coil distance greater than compensating coil and transmitting coil, transmitting coil is cancelled out each other at the background signal of receiving coil and compensating coil.2. the receiving coil that the number of turns is many apart from metal liquid level recently simultaneously apart from eddy current sensor upper metal thing farthest; The compensating coil that the number of turns is few is simultaneously nearest apart from eddy current sensor upper metal thing farthest apart from metal liquid level; On the one hand; Transmitting coil is strong to the induced signal of receiving coil in the vortex flow of responding on the metal liquid level and a little less than the induced signal to compensating coil, and the difference of this two paths of signals has promptly guaranteed sensitivity that metal liquid level is detected greatly; On the other hand; The vortex flow that transmitting coil is responded on eddy current sensor upper metal thing is to the induced signal approximately equal of the induced signal and the compensating coil of receiving coil; It is that eddy current sensor upper metal thing does not almost have influence to detecting liquid level signal that this two paths of signals difference is approximately zero; Thereby guarantee that eddy current sensor detects the stability of liquid level, has improved the antijamming capability of foreign objects.
Should be appreciated that above generality is described and following detailed description is all enumerated and illustrative, purpose is in order to the utility model that requires to protect further explanation to be provided.
Except top described purpose, feature and advantage, the utility model also has other purpose, feature and advantage.To do further detailed explanation to the utility model with reference to figure below.
Description of drawings
Accompanying drawing is formed the part of this instructions, with helping further understand the utility model.
Fig. 1 shows the system diagram according to the eddy current type metal liquid level pick-up unit of the utility model preferred embodiment.
Embodiment
Embodiment to the utility model is elaborated below in conjunction with accompanying drawing, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, metal liquid is injected into the moulding mold 102 through long nozzle from metallurgical tank 107, and eddy current type metal liquid level pick-up unit is used for detecting in real time the metal liquid level 101 in the mold 102.Eddy current type metal liquid level pick-up unit comprises eddy current sensor 103, signal cable 104 and the signal processor 105 that vertically is installed in 101 tops, mold 102 inner metal liquid positions.Eddy current sensor 103 comprises receiving coil 103a, transmitting coil 103b and the compensating coil 103c near to direction far away coaxial arrangement successively apart from metal liquid level 101.The spacing of transmitting coil 103b and receiving coil 103a is greater than the spacing of transmitting coil 103b and compensating coil 103c, and the number of turns of receiving coil 103a is greater than the number of turns of compensating coil 103c, and the number of turns ratio of the number of turns of receiving coil and compensating coil is between 1 to 10.The high-frequency vibration signal that signal processor 105 produces is given transmitting coil through cable 104, on metal liquid level 101, produces vortex flow.The coiling of receiving coil 103a and compensating coil 103c is in the opposite direction, and the background signal that transmitting coil is produced in receiving coil 103a and compensating coil 103c is cancelled out each other.The spacing of transmitting coil 103b and receiving coil 103a is greater than the spacing of transmitting coil 103b and compensating coil 103c; Reduced the background signal that transmitting coil 103b produces in receiving coil 103a, and just can offset the background signal that transmitting coil 103b produces in the more receiving coil 103a of the number of turns with the less compensating coil 103c of the number of turns.Compare with compensating coil 103c; The number of turns of receiving coil 103a is nearer than the multiple spurs metal liquid level, the induced signal that the vortex flow that transmitting coil 103b produces in metal liquid level produces in receiving coil 103a much larger than this vortex flow at the less induced signal that produces among the compensating coil 103c far away apart from metal liquid level again of the number of turns.This two-way induced signal is given signal processor 105 through cable 104 and is carried out the difference computing, provides the exact value of metal liquid level to eddy current sensor 103 distances, and the big more sensitivity of this difference is high more.Except that the background signal that transmitting coil 103b produces in receiving coil 103a; Transmitting coil 103b also can produce vortex flow and form undesired signal on eddy current sensor upper metal thing 106; Can produce interference to eddy current sensor 103 like moving up and down of metallurgical tank bottom metal thing 106; The induced signal that this vortex flow produces in the less compensating coil 103c nearer apart from eddy current sensor 103 upper metal things of the number of turns is approximately equal to the induced signal that this vortex flow produces in the number of turns receiving coil 103a far away than multiple spurs eddy current sensor upper metal thing; This two-way induced signal is also given signal processor 105 through cable 104 and is carried out the difference computing, and this difference is approximately zero.Thereby, to compare with existing eddy current type metal liquid level pick-up unit, the utility model has greatly reduced the interference of eddy current sensor upper metal thing to eddy current sensor detection metal liquid level, has improved stability and antijamming capability.Accept ray circle 103a and compensating coil 103c and be arranged in transmitting coil 103b both sides, compare in the structure of transmitting coil one side with compensating coil, reduced ambient temperature and changed the interference that eddy current sensor 103 is detected metal liquid level with receiving coil.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (4)
1. eddy current type metal liquid level pick-up unit; It is characterized in that; Comprise: eddy current sensor, signal cable and signal processor; Wherein, said eddy current sensor comprises receiving coil, transmitting coil and the compensating coil near to direction far away coaxial arrangement successively apart from metal liquid level, and the spacing of said transmitting coil and receiving coil is greater than the spacing of transmitting coil and compensating coil.
2. eddy current type metal liquid level pick-up unit according to claim 1 is characterized in that the coiling of said receiving coil and compensating coil is in the opposite direction.
3. eddy current type metal liquid level pick-up unit according to claim 2 is characterized in that the number of turns of said receiving coil is greater than the number of turns of compensating coil.
4. eddy current type metal liquid level pick-up unit according to claim 3 is characterized in that the number of turns ratio of the number of turns of said receiving coil and compensating coil is between 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204953681U CN202403763U (en) | 2011-12-02 | 2011-12-02 | Metal liquid level detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204953681U CN202403763U (en) | 2011-12-02 | 2011-12-02 | Metal liquid level detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202403763U true CN202403763U (en) | 2012-08-29 |
Family
ID=46701405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204953681U Expired - Fee Related CN202403763U (en) | 2011-12-02 | 2011-12-02 | Metal liquid level detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202403763U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912417A (en) * | 2012-11-14 | 2013-02-06 | 田志恒 | Solid liquid interface detector for polysilicon ingot furnace |
-
2011
- 2011-12-02 CN CN2011204953681U patent/CN202403763U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912417A (en) * | 2012-11-14 | 2013-02-06 | 田志恒 | Solid liquid interface detector for polysilicon ingot furnace |
| WO2014075578A1 (en) * | 2012-11-14 | 2014-05-22 | 田立 | Solid liquid interface detection device for polysilicon ingot furnace |
| CN102912417B (en) * | 2012-11-14 | 2016-03-30 | 田志恒 | Solid liquid interface detector for polysilicon ingot furnace |
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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: 20120829 Termination date: 20201202 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |