WO2012137255A1 - 溶融金属レベル測定装置 - Google Patents
溶融金属レベル測定装置 Download PDFInfo
- Publication number
- WO2012137255A1 WO2012137255A1 PCT/JP2011/002052 JP2011002052W WO2012137255A1 WO 2012137255 A1 WO2012137255 A1 WO 2012137255A1 JP 2011002052 W JP2011002052 W JP 2011002052W WO 2012137255 A1 WO2012137255 A1 WO 2012137255A1
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- WIPO (PCT)
- Prior art keywords
- signal
- molten metal
- immersion nozzle
- conductive portion
- metal level
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- 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
- G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
Definitions
- the present invention relates to a molten metal level measuring apparatus using a microwave.
- the continuous casting method is a method of manufacturing a slab of a predetermined shape by continuously cooling and solidifying molten metal.
- FIG. 1 is a diagram showing a configuration of a continuous casting machine used in a continuous casting method.
- the continuous casting machine includes a ladle 510, a long nozzle 520, a tundish 530, a plurality of immersion nozzles 150, a plurality of molds, and 540.
- FIG. 1 shows only one immersion nozzle and one mold.
- Molten metal for example, molten steel
- supplied to the ladle 510 is discharged to the tundish 530 through the long nozzle 520.
- Molten metal stored in the tundish 530 is injected into the plurality of molds 540 through the plurality of immersion nozzles 150.
- the mold 540 is a water-cooled mold, and the injected molten metal is cooled and solidified, and metal pieces, for example, steel pieces are continuously formed.
- Patent Document 1 A method of using an electrode rod as a path for electromagnetic waves when measuring the level of molten metal by the propagation time of electromagnetic waves has been developed (Patent Document 1).
- an electrode is inserted into the molten metal, and the level displacement is measured from the difference in propagation time of the transmission signal due to the displacement of the molten metal level.
- the first electrode is applied to the molten metal having electrical conductivity.
- the second electrode are inserted, the first pseudo random signal is transmitted to the first electrode, and the second pseudo random signal having the same pattern as the first pseudo random signal and having a slightly different frequency is transmitted to the first pseudo random signal.
- a first multiplication value is calculated by multiplying the signal
- a second multiplication value is calculated by multiplying the signal obtained from the second electrode and the second pseudo-random signal, and a time series pattern of the first multiplication value
- the displacement of the molten metal is calculated from the time difference of the maximum correlation value generated in the time series pattern of the second multiplication value.
- Patent Document 1 uses an electrode rod as an electromagnetic wave propagation path.
- a general method for sending an electromagnetic wave from a transmitting antenna to a molten metal surface in a mold, which is an object, and detecting an electromagnetic wave reflected by the molten metal surface with a receiving antenna is highly accurate under the influence of multiple reflections. I can't. Further, since the gap around the mold is narrow, it is difficult to install a sufficiently large transmitting / receiving antenna.
- FIG. 2 is a diagram for explaining the molten metal level measuring method described in Patent Document 1.
- FIG. 1 In order to measure the level of molten metal (molten steel) 600 from the initial state, it is necessary to insert two electrode rods 550A and 550B having a length of about 300 to 400 millimeters into the mold 540. If a metal having a melting point equal to or lower than the melting point of the molten metal is used for the electrode rods 550A and 550B, the electrode rods 550A and 550B are not melted when contacting the molten metal 600. Therefore, it is possible to measure the level when the molten metal rises, but not to measure the level when it falls.
- the electrode rods 550A and 550B When a metal having a melting point higher than that of the molten metal is used for the electrode rods 550A and 550B, the electrode rods 550A and 550B are drawn into the molten metal (molten steel) 600 that has been cooled and solidified by the mold. In either case, it is necessary to install the electrode rods 550A and 550B for each measurement. However, since the gap between the tundish 530 and the mold 540 is generally narrow, a complicated operation of installing the two electrode rods 550A and 550B before the tundish 530 moves onto the mold 540 is required. Become.
- the apparatus for measuring a molten metal level includes a first conductive portion and a second conductive portion made of carbon formed integrally with the immersion nozzle in the longitudinal direction of the immersion nozzle, and the first conductive portion. Transmitting a reference microwave signal forming a first pseudo-random signal, and transmitting the reference microwave signal propagated through the first conductive portion, the molten metal and the second conductive portion to the second conductive portion.
- the multiplication value is calculated by multiplying the received microwave signal by a second pseudo-random signal having the same pattern as the first pseudo-random signal and a slightly different frequency of the pseudo-random signal.
- a distance measuring unit that measures a propagation distance of the reference microwave signal from a signal of the multiplication value or a time-series pattern of a signal generated using the multiplication value.
- the first and second conductive portions are made of carbon and are formed separately from each other in the longitudinal direction of the immersion nozzle. Since the melting point of carbon is much higher than the melting point of molten metal such as molten steel, it is not melted by the molten metal unlike a metal electrode rod having a melting point equal to or lower than the melting point of the molten metal. Moreover, the molten steel is always supplied from the immersion nozzle around the immersion nozzle, and the molten steel does not solidify. Therefore, the first and second conductive portions are not drawn into the solidified molten steel. Thus, unlike the conventional electrode rod, the first and second conductive portions can be used repeatedly for multiple measurements. For this reason, the complicated operation
- the frequency of the reference microwave signal is 600 MHz or less
- the distance measurement unit uses a time series pattern of a signal generated using the multiplication value. Then, the phase of the microwave signal is obtained, and the propagation distance of the reference microwave signal is measured using the phase.
- the first and second conductive portions are embedded in a pair of grooves provided in the longitudinal direction of the immersion nozzle, and the surface of the immersion nozzle Is formed so as to form a part of.
- the outer shape of the immersion nozzle does not change. For this reason, the physical phenomenon in the continuous casting process is not affected. Further, since the first and second conductive portions are embedded in the immersion nozzle, it is difficult to separate from the immersion nozzle.
- FIG. It is a figure which shows the structure of the continuous casting machine used for the continuous casting method. It is a figure for demonstrating the molten metal level measuring method described in patent document 1.
- FIG. It is a figure which shows the structure of the 1st electroconductive part of the molten metal level measuring apparatus by one Embodiment of this invention, a 2nd electroconductive part, and its peripheral part. It is a figure which shows an example of a structure of the immersion nozzle formed integrally with the 1st and 2nd electroconductive part. It is a figure which shows the other example of a structure of the immersion nozzle formed integrally with the 1st and 2nd electroconductive part. It is a figure which shows the structure of the molten metal level measuring apparatus by one Embodiment of this invention. It is a figure which shows the structure of the molten metal level measuring apparatus by other embodiment of this invention.
- FIG. 3 is a diagram showing a configuration of the first conductive portion 1001A, the second conductive portion 1001B, and the peripheral portion thereof in the molten metal level measuring apparatus according to an embodiment of the present invention.
- the first conductive portion 1001A and the second conductive portion 1001B correspond to the first electrode and the second electrode of the molten metal level measuring device described in Patent Document 1, respectively.
- the first conductive portion 1001 ⁇ / b> A and the second conductive portion 1001 ⁇ / b> B are integrally formed with the immersion nozzle 100 in the longitudinal direction of the immersion nozzle 100.
- the first conductive portion 1001A is connected to the signal output terminal 1003A, and the coaxial cable 1005A is connected to the signal output terminal 1003A.
- the second conductive portion 1001B is connected to the signal output terminal 1003B
- the coaxial cable 1005B is connected to the signal output terminal 1003B.
- the coaxial cable 1005A and the coaxial cable 1005B are connected to the distance measuring unit of the molten metal level measuring device. The distance measuring unit will be described later.
- FIG. 4 is a diagram showing an example of the configuration of the immersion nozzle formed integrally with the first and second conductive portions.
- Fig.4 (a) is sectional drawing of the surface (horizontal surface) orthogonal to the longitudinal direction of an immersion nozzle.
- FIG. 4B is a side view of the immersion nozzle.
- a pair of grooves separated from each other in the longitudinal direction are provided and embedded in the grooves to form part of the surface of the immersion nozzle.
- 1101A and a second conductive portion 1101B are provided. As shown in FIG.
- the first conductive portion 1101A and the second conductive portion 1101B are the center of the immersion nozzle 110 and the center of the first conductive portion 1101A.
- the line connecting the center of the immersion nozzle 110 and the center of the second conductive portion 1101B form an angle of 180 °. That is, in the horizontal cross section of the immersion nozzle 110, the first conductive portion 1101A and the second conductive portion 1101B are arranged at positions facing each other.
- FIG. 5 is a diagram showing another example of the configuration of the immersion nozzle formed integrally with the first and second conductive portions.
- Fig.5 (a) is sectional drawing of the surface (horizontal surface) orthogonal to the longitudinal direction of an immersion nozzle.
- FIG. 5B is a side view of the immersion nozzle.
- the surface of the immersion nozzle 120 is provided with a pair of grooves that are separated from each other in the longitudinal direction, and is embedded in the grooves to form part of the surface of the immersion nozzle.
- a portion 1201A and a second conductive portion 1201B are provided. As shown in FIG.
- the first conductive portion 1201A and the second conductive portion 1201B are the center of the immersion nozzle 120 and the center of the first conductive portion 1201A.
- a line segment connecting the center of the immersion nozzle 120 and the center of the second conductive portion 1201B form an angle of about 50 °. That is, in the horizontal cross section of the immersion nozzle 120, the first conductive portion 1201A and the second conductive portion 1201B are separated from each other but are arranged at a relatively narrow interval.
- the immersion nozzles 110 and 120 are formed by mixing aluminum dioxide (Al 2 O 3 ) as a main component and mixing silicon dioxide (SiO 2 ) and carbon (C) at a certain ratio.
- the first conductive portions 1101A and 1201A and the second conductive portions 1101B and 1201B are made of carbon.
- the carbon used as a part of the components of the immersion nozzles 110 and 120 has a high electric resistance and cannot be a conductor because it is mixed with other substances. Since only the carbon is used for the first conductive portions 1101A and 1201A and the second conductive portions 1101B and 1201B, it becomes a conductor and functions as a waveguide.
- the melting point of carbon is much higher than the melting point of molten metal, for example, molten steel, it does not melt like the electrode rod of the molten metal level measuring device described in Patent Document 1. Further, the solidified layer of the molten steel is generated at the portion in contact with the mold (540 in FIG. 3), and the molten steel is always supplied from the immersion nozzle around the immersion nozzle (100 in FIG. 3). None do. Therefore, the first conductive portions 1101A and 1201A and the second conductive portions 1101B and 1201B are not drawn into the solidified molten steel. Thus, unlike the conventional electrode rod, the first and second conductive portions can be used repeatedly for multiple measurements. For this reason, the complicated operation
- the carbon forming the first conductive portions 1101A and 1201A and the second conductive portions 1101B and 1201B is also a component of the immersion nozzle itself, and thus does not affect the chemical reaction of the continuous casting process.
- the first conductive portions 1101A and 1201A and the second conductive portions 1101B and 1201B are embedded in a pair of grooves provided on the surface of the immersion nozzle so as to be separated from each other in the longitudinal direction. Since it is provided so as to form a part, the outer shape of the immersion nozzle does not change. For this reason, the physical phenomenon in the continuous casting process is not affected. Further, since the first and second conductive portions are embedded in the immersion nozzle, it is difficult to separate from the immersion nozzle.
- FIG. 6 is a diagram showing a configuration of a molten metal level measuring apparatus according to an embodiment of the present invention.
- the molten metal level measuring apparatus according to the present embodiment includes a first conductive portion 1001A, a second conductive portion 1001B, a peripheral portion thereof, and a distance measuring unit 200, which are integrally formed with the immersion nozzle 100.
- the first conductive portion 1001A, the second conductive portion 1001B, and the peripheral portion formed integrally with the immersion nozzle 100 have been described with reference to FIGS.
- the distance measuring unit 200 will be described below.
- the structure of the distance measuring unit 200 is the same as that shown in Patent Document 1.
- the distance measuring unit 200 includes a first clock generator 201, a second clock generator 203, a first pseudo random signal generator 205, a second pseudo random generator 207, a first multiplier 209, a second multiplier 211, 1 low-pass filter 213, second low-pass filter 215, and arithmetic unit 217.
- the first and second pseudo random signal generators are described as PN encoders.
- the first clock generator 201 generates a frequency f1 (for example, 1500.001 MHz) per clock, and the second clock generator 203 has a frequency f2 (for example, 1500.000 MHz) slightly less than f1 per clock.
- Generate a frequency of The first pseudo-random signal generator 205 generates a first pseudo-random signal M1 having a period P1
- the second pseudo-random signal generator 207 is a second pseudo-random signal M2 having the same pattern as M1 but having a period P2 slightly different from P1. Is generated.
- the first multiplier 209 multiplies M1 passed from the first pseudo random signal generator 205 through the transmission line Lc and M2 passed from the second pseudo random signal generator 207 through the transmission line La.
- the second multiplier 211 multiplies M1 passing through the transmission line Ld from the first pseudo random signal generator 205 and M2 passing through the transmission line Lb from the second pseudo random signal generator 207.
- the first low-pass filter 213 removes high frequency components from the output of the first multiplier 209, and outputs a time series pattern with one period between the maximum correlation values.
- the second low-pass filter 215 removes high-frequency components from the output of the second multiplier 211 and outputs a time-series pattern with one period between the maximum correlation values.
- the calculation unit 217 obtains the difference between the propagation time of the transmission line Ld and the propagation time of the transmission line Lc from the time difference between the maximum correlation values of the time series patterns of the first low-pass filter 213 and the second low-pass filter 215.
- the transmission line Ld includes a portion higher than the molten metal level of the second conductive portion 1001B and the first conductive portion 1001A connected via the molten metal, the propagation time of the transmission line Ld and the transmission line Lc are included.
- the molten metal level can be obtained from the difference from the propagation time of.
- the signal propagation time is delayed by about 1.5 million times, and signal processing can be performed easily and accurately.
- FIG. 7 is a diagram showing a configuration of a molten metal level measuring apparatus according to another embodiment of the present invention.
- the molten metal level measuring apparatus according to the present embodiment includes a first conductive portion 1001A, a second conductive portion 1001B, a peripheral portion thereof, and a distance measuring unit 300 that are formed integrally with the immersion nozzle 100.
- the first conductive portion 1001A, the second conductive portion 1001B, and the peripheral portion formed integrally with the immersion nozzle 100 have been described with reference to FIGS.
- the distance measuring unit 300 will be described below.
- the distance measuring unit 300 includes a first clock generator 301, a second clock generator 303, a first pseudo random signal generator 305, a second pseudo random generator 307, a carrier wave oscillator 309, a phase shifter 313, and a first multiplier 311. , A second multiplier 315, a third multiplier 317, a fourth multiplier 319, a fifth multiplier 321, a first low-pass filter 323, a second low-pass filter 325, a third low-pass filter 327, and an arithmetic unit 329.
- the first clock generator 301 generates a frequency f1 (for example, 100.004 MHz) per clock, and the second clock generator 303 has a frequency f2 (for example, 99.996 MHz) slightly less than f1 per clock.
- Generate a frequency of The first pseudo-random signal generator 305 generates a first pseudo-random signal M1 having a period P1
- the second pseudo-random signal generator 307 is a second pseudo-random signal M2 having the same pattern as M1 and having a period P2 slightly different from P1. Is generated.
- the first and second pseudo random signal generators are described as PN encoders.
- the first multiplier 311 multiplies the carrier wave having a frequency of 500 MHz from the carrier wave oscillator 309 by the first pseudo-random signal M1, and sends a spread spectrum signal obtained by phase-modulating the carrier wave to the coaxial cable 1005B.
- the second multiplier 315 multiplies M1 from the first pseudo random signal generator 305 through the transmission line Lc and M2 from the second pseudo random signal generator 307 through the transmission line La.
- the first low-pass filter 323 removes high frequency components from the output of the second multiplier 315, and outputs a time series pattern with one period between the maximum correlation values. That is, the output of the first low-pass filter 323 forms a reference signal indicating a value other than 0 when the phases of the first and second pseudorandom signals coincide.
- the third multiplier 317 multiplies M1 passed from the first pseudo random signal generator 305 through the transmission line Ld and M2 passed from the second pseudo random signal generator 307 through the transmission line Lb.
- the output of the third multiplier 317 is supplied to the fourth multiplier 319 and the fifth multiplier 321 as R1 and R2.
- the phase shifter 313 supplied with the carrier wave from the carrier wave oscillator 309 outputs the signal I having the in-phase component (phase 0 degree) and the signal Q having the quadrature component (phase 90 degree) with respect to the input signal, and each of the fourth multipliers. 319 and the fifth multiplier 321.
- the fourth multiplier 319 multiplies the I signal from the phase shifter 313 and R1 from the third multiplier 317.
- the second low-pass filter 325 removes high frequency components from the output of the fourth multiplier 319, and outputs a time series pattern with one period between the maximum correlation values.
- the fifth multiplier 321 multiplies the Q signal from the phase shifter 313 and R2 from the third multiplier 317.
- the third low-pass filter 327 removes high-frequency components from the output of the fifth multiplier 321 and outputs a time-series pattern with one period between the maximum correlation values.
- the maximum value I ′ of the output of the second low-pass filter 325 for one period of the reference signal and the maximum value Q ′ of the output of the third low-pass filter 327 for one period of the reference signal are obtained. Find the phase ⁇ of M1 through Ld.
- the frequency of the carrier wave is 600. Even if the distance is lowered to megahertz or less, the distance measuring unit 300 can perform measurement with high accuracy. Therefore, for example, if the frequency of the carrier wave is 500 MHz, the length of one wavelength is 600 millimeters. For example, the measurement range of the molten steel level of a continuous casting machine in steel is about 400 millimeters, so it is within one wavelength.
- the relationship between the propagation distance l of electromagnetic waves and the phase ⁇ in units of radians can be expressed by the following equation where the wavelength is ⁇ .
- the molten metal level (molten steel level) x can be obtained from the equation (2).
- the molten metal level can be accurately measured by measuring only the phase of the carrier wave with the frequency of the carrier wave being 600 MHz or less.
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- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims (3)
- 浸漬ノズルの長手方向に該浸漬ノズルと一体に互いに分離されて形成されたカーボンからなる第1及び第2の導電性部分と、
該第1の導電性部分に、第1の疑似ランダム信号を形成する基準マイクロ波信号を送信し、該第1の導電性部分、溶融金属及び該第2の導電性部分を伝搬した基準マイクロ波信号を該第2の導電性部分から受信し、該受信されたマイクロ波信号と、第1の疑似ランダム信号と同一のパターンで疑似ランダム信号の周波数がわずかに異なる第2の疑似ランダム信号を乗算して乗算値を算出し、該乗算値の信号または該乗算値を使用して生成した信号の時系列パターンから該基準マイクロ波信号の伝搬距離を測定する距離測定部と、を備えた溶融金属レベル測定装置。 - 前記基準マイクロ波信号の周波数が600メガヘルツ以下であり、前記距離測定部は、前記乗算値を使用して生成した信号の時系列パターンからマイクロ波信号の位相を求め、該位相を使用して前記基準マイクロ波信号の伝搬距離を測定する請求項1に記載の溶融金属レベル測定装置。
- 前記第1及び第2の導電性部分が、前記浸漬ノズルの長手方向に設けられた一対の溝に埋め込まれて、浸漬ノズルの表面の一部を形成するように設けられている請求項1から3のいずれかに記載の溶融金属レベル測定装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11788324.9A EP2696177A4 (en) | 2011-04-06 | 2011-04-06 | METAL LEVEL MEASURING DEVICE MELT |
CN201180002570.9A CN102822642B (zh) | 2011-04-06 | 2011-04-06 | 熔融金属液位测定浸渍喷嘴和熔融金属液位测定装置 |
PCT/JP2011/002052 WO2012137255A1 (ja) | 2011-04-06 | 2011-04-06 | 溶融金属レベル測定装置 |
KR1020117029042A KR20130138364A (ko) | 2011-04-06 | 2011-04-06 | 용융 금속 레벨 측정 장치 |
JP2011545582A JP5638004B2 (ja) | 2011-04-06 | 2011-04-06 | 溶融金属レベル測定用浸漬ノズル及び溶融金属レベル測定装置 |
US13/342,731 US8361378B2 (en) | 2011-04-06 | 2012-01-03 | Immersion nozzle used for measuring level of molten metal and apparatus for measuring level of molten metal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2011/002052 WO2012137255A1 (ja) | 2011-04-06 | 2011-04-06 | 溶融金属レベル測定装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/342,731 Continuation US8361378B2 (en) | 2011-04-06 | 2012-01-03 | Immersion nozzle used for measuring level of molten metal and apparatus for measuring level of molten metal |
Publications (1)
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WO2012137255A1 true WO2012137255A1 (ja) | 2012-10-11 |
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Family Applications (1)
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PCT/JP2011/002052 WO2012137255A1 (ja) | 2011-04-06 | 2011-04-06 | 溶融金属レベル測定装置 |
Country Status (6)
Country | Link |
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US (1) | US8361378B2 (ja) |
EP (1) | EP2696177A4 (ja) |
JP (1) | JP5638004B2 (ja) |
KR (1) | KR20130138364A (ja) |
CN (1) | CN102822642B (ja) |
WO (1) | WO2012137255A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US9518856B2 (en) * | 2014-03-28 | 2016-12-13 | Honeywell International Inc. | Threaded coupling device with nozzle for GWR measurements in non-metallic tanks |
JP5782202B1 (ja) * | 2014-08-01 | 2015-09-24 | 株式会社ニレコ | 渦流式モールドレベル測定装置及びモールドレベル測定方法 |
TWI620119B (zh) * | 2017-02-21 | 2018-04-01 | 群聯電子股份有限公司 | 隨機資料產生電路、記憶體儲存裝置及隨機資料產生方法 |
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JPH07191130A (ja) * | 1993-12-27 | 1995-07-28 | Nireco Corp | 溶融金属の変位測定方法および装置 |
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JPS54153663A (en) * | 1978-05-24 | 1979-12-04 | Nippon Kokan Kk | Method of removing nozzle for measured signal of molten material level in mold for continuous casting |
JPS56152152A (en) | 1980-04-25 | 1981-11-25 | Matsushita Electric Works Ltd | Fluorescent lamp |
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JPS60136852A (ja) | 1983-12-26 | 1985-07-20 | Nec Corp | 情報処理装置の制御方式 |
JPH01284468A (ja) * | 1988-05-11 | 1989-11-15 | Sumitomo Metal Ind Ltd | 連続鋳造用浸漬ノズル |
US4810988A (en) * | 1988-06-20 | 1989-03-07 | Westinghouse Electric Corp. | Slag detector transducer coil assembly |
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JPH06182513A (ja) * | 1992-12-21 | 1994-07-05 | Nippon Steel Corp | 連続鋳造用浸漬ノズルからのガス吹き込み方法 |
JP2856060B2 (ja) * | 1994-02-16 | 1999-02-10 | 住友金属工業株式会社 | 金属の連続鋳造における湯面位置の調整方法 |
WO1996026800A1 (fr) * | 1995-02-28 | 1996-09-06 | Nkk Corporation | Procede et appareil de regulation de la coulee continue |
JPH09178533A (ja) * | 1995-12-27 | 1997-07-11 | Nkk Corp | 溶融金属レベル計測方法及び装置 |
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2011
- 2011-04-06 WO PCT/JP2011/002052 patent/WO2012137255A1/ja active Application Filing
- 2011-04-06 JP JP2011545582A patent/JP5638004B2/ja not_active Expired - Fee Related
- 2011-04-06 EP EP11788324.9A patent/EP2696177A4/en not_active Withdrawn
- 2011-04-06 CN CN201180002570.9A patent/CN102822642B/zh not_active Expired - Fee Related
- 2011-04-06 KR KR1020117029042A patent/KR20130138364A/ko not_active Application Discontinuation
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2012
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS56152152U (ja) * | 1980-04-14 | 1981-11-14 | ||
JPS60136852U (ja) * | 1984-02-21 | 1985-09-11 | 新日本製鐵株式会社 | 湯面レベル測定用浸漬ノズル |
JPH07191130A (ja) * | 1993-12-27 | 1995-07-28 | Nireco Corp | 溶融金属の変位測定方法および装置 |
JPH09166477A (ja) * | 1995-12-18 | 1997-06-24 | Nkk Corp | 導電体長計測装置及びレベル計測装置 |
Non-Patent Citations (1)
Title |
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See also references of EP2696177A4 * |
Also Published As
Publication number | Publication date |
---|---|
US8361378B2 (en) | 2013-01-29 |
KR20130138364A (ko) | 2013-12-19 |
US20120256782A1 (en) | 2012-10-11 |
JPWO2012137255A1 (ja) | 2014-07-28 |
EP2696177A4 (en) | 2014-11-05 |
JP5638004B2 (ja) | 2014-12-10 |
CN102822642A (zh) | 2012-12-12 |
CN102822642B (zh) | 2015-09-09 |
EP2696177A1 (en) | 2014-02-12 |
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