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1. 发明专利

JPH09145254A ELECTRIC FURNACE 失效
公开(公告)号：JPH09145254A
公开(公告)日：1997-06-06
申请号：JP30126995
申请日：1995-11-20
申请人： NIPPON STEEL CORP
发明人： YAMADA NOBUO , TAKANO HIRONORI , NIIOKA MASAKI , FUKUYAMA MASARU , UMETSU KENJI
IPC分类号： F27B3/08 , F27D11/08
摘要： PROBLEM TO BE SOLVED: To reduce a loss of electrical power and eliminate a phenomenon of unbalanced state of 3-phase by a method wherein a transformer for an electrical furnace having extending electrodes connected to a rear end of each of graphite electrodes and the extending electrodes applied as a secondary winding and an electric collecting short-circuited device for making a short-circuit of extending 3-phase electrodes to each other is arranged at an upper part of the transformer. SOLUTION: A transformer 24 for an electric furnace constructed such that a water-cooled electrical conductive pipe 26 cooperatively connected to an upper part of each of graphite electrodes is applied as a secondary winding is arranged on a fourth floor 28. An electricity collecting short-circuit device 27 for making a relative short-circuit state of extending electrodes of 3-phase is arranged at an upper part of the transformer 24 for the electric furnace. Then, the electricity collecting short-circuit device 27 can be raised or lowered by a rack part 29 cooperatively connected to an upper part of the extending electrode water- cooled electrical conductive pipe part 26 and an electrode ascending or descending driving device 31 installed at a fifth floor 30 in response to a melting state in the furnace and an operating state of the furnace. With such an arrangement as above, a loss of electrical power can be reduced, an unbalanced state of 3-phase can be eliminated and a responding characteristic of the electrode ascending or descending speed can be made fast.

2. 发明专利

JPH0350489A WALL ELECTRODE FOR DC ARC FURNACE 失效
公开(公告)号：JPH0350489A
公开(公告)日：1991-03-05
申请号：JP7465190
申请日：1990-03-24
申请人： NIPPON STEEL CORP
发明人： NIIOKA MASAKI , ARIMITSU ISAO , MORI KIYOSUKE , MAKINOKADO SHINAN , TAKAHASHI MAKOTO , YASUI YOSHIMASA
IPC分类号： F27B3/08
摘要： PURPOSE:To suppress fusion loss due to melted metal and to obtain furnace wall electrodes which do not need a cooling mechanism by passing one or more high melting point conductive materials molded in a rod state through the wall of a DC arc furnace composed of an indeterminate form refractory material, and using the material as an electrode of the side in contact with the melting metal. CONSTITUTION:A supporting plate 3a in which a plurality of rodlike electrodes 5 are stood in a furnace bottom electrode mounting hole 4 is secured to an iron sheath 3 by fittings 9. An indeterminate form refractory material 10 such as magnesia, etc., is filled in the hole 4, and the material 10 is pounded in a state that the electrodes 5 are buried by ramming or applying vibration thereto. As a result, the plurality of electrodes 5 are passed through the wall to be disposed in the hole 4. High melting point conductive materials are employed as the electrodes 5 to obtain electrodes having excellent durability. The materials are satisfactorily draped with the material 10 filled in the hole 4, and no gap for causing intrusion of melted material, etc., is formed between the electrodes 5 and the material 10. Further, since heat resistance is excellent as compared with metal, it is not necessary to cool the rear ends of the electrodes 5.

3. 发明专利

JPH0137229B2 失效
公开(公告)号：JPH0137229B2
公开(公告)日：1989-08-04
申请号：JP27560385
申请日：1985-12-07
申请人： NIPPON STEEL CORP
发明人： NAITO SHUNTA , NIIOKA MASAKI
IPC分类号： B22D11/10 , B01F13/08 , B22D11/115

4. 发明专利

JPS63188461A ELECTROMAGNETIC COIL APPARATUS FOR CONTINUOUS CASTING MOLD 失效
公开(公告)号：JPS63188461A
公开(公告)日：1988-08-04
申请号：JP1855287
申请日：1987-01-30
申请人： NIPPON STEEL CORP
发明人： NIIOKA MASAKI , MITSUKI NOBUAKI
IPC分类号： B22D11/10 , B22D11/115
摘要： PURPOSE:To improve the quality of a cast slab and the working ratio of the equipment by arranging an electromagnetic coil having odd pieces of teeth with three pieces or more and also enabling connection by selecting among DC, AC or AC and DC superimposing power sources to each coil. CONSTITUTION:One pair of electromagnetic coils are arranged on the back of two pieces of long wall side plates 20 for a mold and three pieces of the teeth parts 27A, 27B, 27C of a core 27 are projected to the long wall side and in a yoke part, each the coil 26 is wound. Then, the center teeth part 27B is arranged at injecting part 24 of the submerged nozzle 17 and both end side teeth parts 27A, 27C are arranged at flowing part of the molten metal. At the time of connecting by selecting each of among DC, AC or AC and DC superimposing power sources to the coil 26, the main magnetic flux penetrating part forms the intense magnetic field range 25, to execute effective electromagnetic stirring and electromagnetic brake action. In this way, the floating of inclusion is promoted and the quality of cast slab is improved and the working ratio of casting equipment by continuing of the casting operation, etc., is improved.

5. 发明专利

JPS6049593A HEATER FOR MOLTEN METAL BY PLASMA ARC 失效
公开(公告)号：JPS6049593A
公开(公告)日：1985-03-18
申请号：JP15732783
申请日：1983-08-29
申请人： NIPPON STEEL CORP
发明人： NIIOKA MASAKI , FUKUYAMA MASARU , MURE HIROSHI
IPC分类号： H05B7/18 , F27B3/08 , F27D11/08 , H05B7/144

6. 发明专利

JPH02263095A DC ARC FURNACE WALL ELECTRODE 失效
公开(公告)号：JPH02263095A
公开(公告)日：1990-10-25
申请号：JP8629489
申请日：1989-04-04
申请人： NIPPON STEEL CORP
发明人： HORIKAWA YUKINOBU , NIIOKA MASAKI , MAKINOSUMI SHINAN , ARIMITSU ISAO , MORIO KATSUHIRO , MORI KIYOSUKE
IPC分类号： F27D11/10 , F27B3/08 , H05B7/12
摘要： PURPOSE:To cool efficiently the tip of an electrode inside a furnace which is subjected to marked melting loss and improve its durability by providing a gas passage which is formed, penetrating a sleeve axially and a gas pipeline which blows gas into the furnace by way of said gas passage. CONSTITUTION:A sleeve 5 is fitted into an electrode 4 so that a gas passage 6 is provided, penetrating the sleeve axially 5. The gas 9 which is introduced from a gas supply source by way of a gas pipeline 8 is expanded once at a wind box 7, then transferred to the gas passage 6 so that the sleeve 5 or the tip of a rod-shaped electrode 4 may be cooled by the gas flowing through the gas passage 6. It is, therefore, possible to maintain the tip of the rod-shaped electrode 4 heat-damaged to a remarkable extent, especially by molten metal, at a low temperature and hence improve its durability. If an attempt is made to spray a cooling medium 20 to the rear end of the rod-shaped electrode 4 in addition to the gas cooling, more definite cooling action will be available.

7. 发明专利

JPS6277157A DEVICE FOR CONTROLLING FLOW OF MOLTEN METAL FOR TWIN ROLL TYPE CONTINUOUS CASTING INSTALLATION 失效
公开(公告)号：JPS6277157A
公开(公告)日：1987-04-09
申请号：JP21830185
申请日：1985-09-30
申请人： NIPPON STEEL CORP , NITTETSU PLANT DESIGNING CORP
发明人： NIIOKA MASAKI , ISHIKAWA YOSHIYASU , KAMIYOSHI TOYOHIKO , ICHINOSE MAKOTO
IPC分类号： B22D11/06
摘要： PURPOSE:To make the quality in a molten metal uniform and the quality of a thin metallic sheet uniform by constituting water cooled rolls of a nonmagnetic material and disposing coils and cores for controlling the flow of the molten metal is said rolls. CONSTITUTION:The water cooled rolls 1, 2 are constituted of the hollow nonmagnetic material and the cores 8 wound with the coils 7 are disposed to the molten metal side therein. A control device 9 for passing AC or DC current to the coils 7 is provided. The AC current is passed to the coils 7 to form a progressive magnetic field in the case of stirring the molten metal. On the other hand, the DC current is supplied to the coils 7 in the case of suppressing the flow of the molten metal. The flow control of the molten metal from an extremely short distance from the molten metal is thus executed.

8. 发明专利

JPS61253152A SEPARATION TYPE ELECTROMAGNETIC STIRRER IN CONTINUOUS CASTING INSTALLATION 失效
公开(公告)号：JPS61253152A
公开(公告)日：1986-11-11
申请号：JP9385985
申请日：1985-05-02
申请人： NIPPON STEEL CORP
发明人： NIIOKA MASAKI , ICHINOSE MAKOTO , AO YOJI , SHIMA SHOZO
IPC分类号： B22D11/10 , B22D11/115 , B22D11/12
摘要： PURPOSE:To improve stirring efficiency and to permit the easier passage of a dummy bar by forming plural ingot passage ports with two pieces of inductor iron cores facing each other and providing a switch device between both iron cores. CONSTITUTION:The inductor iron core 18 and the inductor iron core 1 on one side are disposed to face each other and the switch device 13 is provided to the top end on the open side of the core 1. Coils 2-8 are further wound on the respective sides of the cores 1, 18 to constitute an inductor 19. The cores 1, 18 are separated by opening the device 13, by which the interference of a connecting arm 17 of the dummy bar 15 and the coil 5 is prevented and the passage of the dummy bar 15 is made easier. The ingot passes respectively through the port enclosed of the windings 5, 6, 7, 8 and the port enclosed of the windings 2, 3, 4, 5 when the device 13 is closed by the above-mentioned method. The molten steel stirring effect in the ingot is thus improved.

9. 发明专利

JPS61128500A Shift type plasma torch 失效
公开(公告)号：JPS61128500A
公开(公告)日：1986-06-16
申请号：JP24993284
申请日：1984-11-27
申请人： Nippon Steel Corp
发明人： NIIOKA MASAKI , SHINODA TSUYOSHI , MITSUKI NOBUAKI , KUWANO KAZUHIRO
IPC分类号： H05H1/40

10. 发明专利

JPS60137558A ELECTROMAGNETIC STIRRER FOR CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JPS60137558A
公开(公告)日：1985-07-22
申请号：JP24487483
申请日：1983-12-27
申请人： NIPPON STEEL CORP , DAIDO STEEL CO LTD
发明人： UZAWA HIROSHI , NIIOKA MASAKI , UKAI ATSUSHI , OGAWA KOREAKI
IPC分类号： B22D11/10 , B22D11/115 , B22D11/12
摘要： PURPOSE:To prevent formation of thickened segregation and pores in a billet by sandwiching the billet from both sides with an electromagnetic stirrer, enabling stirring of the vertical flow within the vertical section in the drawing direction of the billet and forming the iron core of the stirrer to have a prescribed thickness. CONSTITUTION:An electromagnetic stirrer 5 having 200-300mm. pole pitch and operating on a moving magnetic field of a commercial frequency (50 or 60Hz) is so installed as to sandwich a billet 1 from both sides of short pieces. A pair of counter or parallel vertical flows are induced in the billet 1 within the vertical section in the drawing direction of the billet 1. Said stirrer 5 is formed to 50- 100% ion core thickness (as compared to the short side size of the billet) in the direction perpendicular to the drawing direction of the billet. The formation of the thickened segregation and pores in the billet produced by a continuous casting machine for a middle section bloom or small section billet is averted.

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