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1. 发明专利

JPH05312620A 失效
公开(公告)号：JPH05312620A
公开(公告)日：1993-11-22
申请号：JP3032292
申请日：1992-02-18
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： MOTOMURA MASAKI , NAGANUMA YOICHI , TANAKA KEIHACHIRO
IPC分类号： G01F23/26
摘要： PURPOSE:To suppress error in measurement by oppositely disposing transmitting and receiving coils on the outside of a vessel above the surface of molten metal and dividing an output from a molten metal level detector by an output induced in the receiving coil thereby correcting the output from the detector. CONSTITUTION:Receiving coils 4a, 7a of molten metal level detector are disposed in the vicinity of a place where molten steel 1 does not reach, and an AC voltage is applied on a coil 4b from a power supply 5. Voltage induced in a coil 7b is fed through a bandpass filter 8b, a rectifier 9b, and an LPF 10b to produce a DC voltage SVb. Similarly, output from a coil 7a in the level detector is fed through a bandpass filter 8a, a rectifier 9a, and an LPF 10a to produce a DC voltage SVa. A divider 11 calculates a value of SVa/SVb which varies only when the level of molten steel 1 varies because effects of the variation of electrical characteristic values of molds 2, 3 are offset. The value SVa/SVb is then converted through a molten level converter 12 into the level. of molten steel 1.

2. 发明专利

JPS6434553A METHOD FOR CONTROLLING MOLTEN STEEL LEVEL IN CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JPS6434553A
公开(公告)日：1989-02-06
申请号：JP19046187
申请日：1987-07-31
申请人： MITSUBISHI HEAVY IND LTD , NIPPON STEEL CORP
发明人： TERADO SADAMU , KAWANAMI KATSUSUKE , HATTORI HIDENORI , ITO HIROO , TANAKA KEIHACHIRO
IPC分类号： B22D11/16 , B22D11/06 , B22D11/18
摘要： PURPOSE:To improve the productivity and the quality and to obtain reduction of man-hour by perfectly automatizing molten steel level control at initial period after starting casting to optimize reaching time into the aimed molten steel level and over-shoot. CONSTITUTION:The molten steel flow rate Q1 is adjusted by driving a stopper 9 upward/downward through a stopper driving device 10, and the molten steel 6 in a tundish 5 is supplied into tulip zone 8 through a nozzle 7. Casting condition and molten steel level detecting signal theta are inputted and the level control device 12 outputting stopper opening command Z and drum speed command V is constituted by an opening pattern arithmetic part 20, level aimed value arithmetic part 21, controller 22, control starting timing generating part 25 and switch 24. At the time of starting the casting, the stopper opening Z is pattern-controlled and when the molten steel level theta comes to near the aimed value theta*, the pattern control is exchanged into feed-back control by a level detecting value theta. By this method, start-up of the molten steel level is quickened and the over-shoot is prevented.

3. 发明专利

JPH06137921A METHOD FOR DETECTING MOLTEN METAL LEVEL 失效
公开(公告)号：JPH06137921A
公开(公告)日：1994-05-20
申请号：JP28728992
申请日：1992-10-26
申请人： NIPPON STEEL CORP
发明人： SADAKI ATSUSHI , TANAKA KEIHACHIRO , MOTOMURA MASAKI , TOKUDA ATSUHIRO , MORIKAGE TSUZUKU , SUNAKAWA AKIRA
IPC分类号： G01F23/26
摘要： PURPOSE:To restrain discontinuity due to switching of detector by disposing a plurality of sets of detectors while overlapping the detection ranges, at the fringe regions thereof, in the direction of level variation of molten metal thereby correcting aging of the detector on-line. CONSTITUTION:A detector comprises transmission coils 4a-4e, receiving coils 7a-7e, BPFs 8a-8e, synchronous rectifiers 9a-9e, and LPFs 10a-10e. If molten metal 1 is filled between the transmission coil 4a and the receiving coil 7a, eddy current is induced in the molten metal 1 by a part of alternating flux transmitted through a mold 2 when the flux passes through the molten metal 1. In this regard, voltage induced in the transmission coil 7a corresponds to the molten metal level filled between the coils 4a, 7a. In order to detect molten level range corresponding to the output voltage of a detector on the low molten level side basing on the output voltage of a detector on the high molten level side between adjacent detectors, respective measuring ranges are overlapped at the fringe regions thereof.

4. 发明专利

JPH06126392A METHOD FOR CONTROLLING MOLTEN METAL SURFACE LEVEL IN TWIN BELT CONTINUOUS CASTING 失效
公开(公告)号：JPH06126392A
公开(公告)日：1994-05-10
申请号：JP27966792
申请日：1992-10-19
申请人： NIPPON STEEL CORP
发明人： SADAKI ATSUSHI , TANAKA KEIHACHIRO , TOKUDA ATSUHIRO , MORIKAGE TSUZUKU , SUNAKAWA AKIRA
IPC分类号： B22D11/06 , B22D11/18 , G05B11/42 , G05D9/12
摘要： PURPOSE:To improve the quality and the yield of a product by measuring molten metal surface level at different positions, calculating a command value from the average level, level difference and level aimed value of the molten metal surface level and executing the molten metal surface level control. CONSTITUTION:The molten metal surface level is measured at two or more different positions. The average level and the level difference are calculated through a modal filter from the molten metal surface level measured values at two positions. A main molten metal pouring rate command value in each nozzle is calculated from the molten metal surface level aimed value and the molten metal surface average level. An auxiliary molten metal pouring rate command value in each nozzle is calculated from the molten metal surface level difference. The molten metal pouring rate command value is calculated from the main molten metal pouring rate command value and the auxiliary molten metal pouring rate command value, and outputted to each molten metal pouring rate operating device. The disturbance is compensated and the vibration of the molten metal surface can be restrained.

5. 发明专利

JPH05222372A CONTROL OF COMBUSTION IN COKE OVEN 失效
公开(公告)号：JPH05222372A
公开(公告)日：1993-08-31
申请号：JP6815291
申请日：1991-04-01
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO YASUNORI , SHIHARA YASUTAKA , TANAKA KEIHACHIRO
IPC分类号： C10B21/10
摘要： PURPOSE:To provide the title method comprising determining the flow rates of a fuel gas and air fed to each combustion chamber by calculation without providing the chambers with flow meters and determining the target value of the degree of opening of a cock which regulates the flow rate of the mixed gas fed to the chamber. CONSTITUTION:The flow rate ratio is calculated from the detected degree of opening of each cock and the maximum flow rate per cock is determined by calculation from the flow rate ratio. A coefficient K1 is determined from the pressure in a distribution pipe and the overhead pressure in the combustion chamber, and smoothed. The smoothed maximum flow rate is determined, and the flow rate of each cock is determined from the flow rate and the smoothed maximum flow rate. The maximum flow rate per cock is determined from the target value of the pressure in the distribution pipe and the target value of the overhead pressure in the combustion chamber. The flow rate ratio of each cock is determined from the target flow rate and the maximum flow rate of each cock, and the flow rate ratio is converted into the degree of opening of the cock.

6. 发明专利

JPH04187348A INSTRUMENT FOR MEASURING DISTRIBUTION OF COATING FILM THICKNESS IN TWIN BELT CASTER 失效
公开(公告)号：JPH04187348A
公开(公告)日：1992-07-06
申请号：JP31280290
申请日：1990-11-20
申请人： NIPPON STEEL CORP
发明人： NAGANUMA YOICHI , MOTOMURA MASAKI , TANAKA KEIHACHIRO , TOKUDA ATSUHIRO
IPC分类号： B22D11/06 , B22D11/16
摘要： PURPOSE:To measure the distribution of carbon film thickness during operation by utilizing heat insulating effect in the coasting film and measuring the distribution of surface temp. in non-contact condition. CONSTITUTION:A casting belt 10 applying the coating film is heated and dried with a heater 18. Surface temp. of the casting belt 10 and distribution thereof are masured in non-contact condition with an infrared camera 14. The surface temp. shows the temp. according to the thickness of coating film with the heat insulating effect of the coating film. By measuring and storing the relation between the surface temp. and the film thickness in advance, the distribution of film thickness in every moments can be displayed and outputted. By this method, the distribution of film thickness can be always observed in on-line and the pressures of plural coating nozzles 20 are controlled so as to obtain uniform film thickness, and the development of crack, surface fold and flaw in a strip can be prevented.

7. 发明专利

JPH0413910A MEASURING DEVICE OF DISTRIBUTION OF THICKNESS OF OXIDE FILM 失效
公开(公告)号：JPH0413910A
公开(公告)日：1992-01-17
申请号：JP11737790
申请日：1990-05-07
申请人： NIPPON STEEL CORP
发明人： HIRANO SHINYA , TANAKA KEIHACHIRO , TANAKA TOMIO
IPC分类号： G01B11/06
摘要： PURPOSE:To automate measurement and to improve the precision in measurement by setting a plane-shaped heat radiation source above a metal plate to be measured and by determining the thickness of an oxide film on the basis of reflectance calculated from irradiation luminance and reflection luminance, in measurement of the distribution of the thickness of the oxide film of a steel plate strip or the like. CONSTITUTION:In a process of forming an oxide film on the upper surface of a metal plate 5 which is an object of measurement, a plane-shaped heat radiation source 1 is set above the metal plate 5. The distribution of reflection luminance in a reflection image part 4 on the metal plate 5 is measured by a detector 2 using a two-dimensional array element. An arithmetic device 3 calculates reflectance rholambda from irradiation luminance determined from a reflection luminance signal Llambda and a signal of a surface temperature of the heat radiation source 1, by rholambda = Llambda/Llambda0. Moreover, it determines the thickness (d) of the oxide film from an equation d = F(rholambda) which is stored beforehand. A detection wavelength lambda is set to be larger than 4.n.dmax and the reflectance and the thickness of the oxide film are made to correspond to each other, 1 to 1.

8. 发明专利

JPH07256419A METHOD FOR CONTROLLING MOLTEN STEEL SURFACE LEVEL IN CONTINUOUS CASTING FOR DUPLEX LAYER STEEL PLATE 失效
公开(公告)号：JPH07256419A
公开(公告)日：1995-10-09
申请号：JP5013594
申请日：1994-03-22
申请人： NIPPON STEEL CORP
发明人： TANAKA KEIHACHIRO , ARAKI MASAYUKI , SATO TAKASHI , TAKEUCHI EIICHI
IPC分类号： B22D11/00 , B22D11/18
摘要： PURPOSE:To stably execute the pouring of molten steel into a mold by calculating the molten steel pouring rates from the molten steel surface level in the mold and casting velocities and calculating the molten steel head of each of molten steel storing vessels and adjusting the opening degrees of opening adjust means. CONSTITUTION:The different kinds of molten steels 1, 6 are dividedly poured into one mold 4 from each of two molten steel storing vessels 2, 7 independently divided in the inner part of a tundish through each of the opening adjust means and pouring nozzles 3, 8, respectively. The molten steel pouring rates are calculated from the molten steel surface level in the mold and the casting velocity. The molten steel head is calculated from the molten steel heads in the molten steel storing vessels 2, 7 and the molten steel surface level in the mold. A first pouring rate correcting factor ratio 35 is calculated by using the pouring rates 33, heads 34 and the opening degrees of the adjust means. A second pouring rate correcting factor ratio 36 is calculated by using the reducing velocities of the molten steel heads in the storing vessels 2, 7. Sum of the opening degrees 38 in the opening adjust means for keeping the molten steel surface level in the mold to an aimed value is calculated by using each of the calculated values. Prescribed opening degrees 39 are set by using the sum of opening degrees and the aimed pouring ratio.

9. 发明专利

JPH07178525A METHOD FOR CONTROLLING POURING QUANTITY OF MOLTEN STEEL FOR SURFACE LAYER IN CONTINUOUS CASTING OF DOUBLE LAYERED STEEL PLATE 失效
公开(公告)号：JPH07178525A
公开(公告)日：1995-07-18
申请号：JP32722193
申请日：1993-12-24
申请人： NIPPON STEEL CORP
发明人： TANAKA KEIHACHIRO , ARAKI MASAYUKI , SATO TAKASHI , TAKEUCHI EIICHI
IPC分类号： B22D11/00 , B22D11/16 , B22D11/18
摘要： PURPOSE:To obtain a double layerer steel plate having clear interface between surface layer and inner layer and excellent surface characteristic by calculating and controlling the detected pouring rate calculated from the average reducing quantity to the wt. of molten steel for surface layer in a tundish so as to keep it to the aimed pouring rate. CONSTITUTION:The molten steel 2 for surface layer is cast into the upper part of a mold 4 through a pouring nozzle 3 and the molten steel 7 for inner layer is cast into the periphery of the center position of a DC magnetic field generator 10 of the mold 4 through a pouring nozzle 8. Then, both molten metals are cooled and solidified, then drawn out as the surface layer steel plate 5 and the inner layer steel plate 9 from the lower opening end of the mold 4. On the way of this process, at first, the aimed pouring rate 28 for making the surface thickness constant is calculated. The molten steel pouring rate 17 is detected from the molten steel wt. for surface layer through a load cell 13 and a coefficient vector 20 is calculated from the pouring rate and the setting opening degree 18 of a stopper 11. Further, an observation gain vector is calculated to estimate a condition variable vector 23 and this variable vector is inputted together with a control gain vector 25 are inputted to the pouring rate adjuster 26. In the pouring rate regulator 26, the deviation between the detected pouring rate 17 and the aimed pouring rate 28 is obtd. and the setting opening degree 18 of the stopper 11 is calculated and set.

10. 发明专利

JPH05222373A CONTROL OF COMBUSTION IN COKE OVEN 失效
公开(公告)号：JPH05222373A
公开(公告)日：1993-08-31
申请号：JP5642291
申请日：1991-03-20
申请人： NIPPON STEEL CORP
发明人： ARAKI MASAYUKI , TANAKA KEIHACHIRO , NAGANUMA YOICHI , YAMAMOTO YASUNORI
IPC分类号： C10B21/10 , C10B21/20
摘要： PURPOSE:To provide the title method comprising determining the flow rate of a fuel gas and air fed to each combustion chamber by calculation without providing the chambers with flow meters and appropriately controlling the air-fuel ratio of the combustion chamber according to the determined flow rates. CONSTITUTION:The flow rate of a fuel gas fed to each combustion chamber and that of air fed to the chamber are determined by calculation to determine the air-fuel ratio A/G(i), to which is made compensation for calorie change, waste gas O2 content and nonburning prevention to calculate the target value AGx(i). The target value of air flow rate is determined from the determined volume of gas feed VG2(i) and AGx(i), and the target values of the air flow rate and fuel gas flow rate are converted into the degrees of opening of the cocks by calculation.

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