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1. 发明专利

JP2002257789A LEAKAGE FLUX DETECTING DEVICE 失效
公开(公告)号：JP2002257789A
公开(公告)日：2002-09-11
申请号：JP2001055486
申请日：2001-02-28
申请人： NIPPON KOKAN KK , N D R KK
发明人： KATO HIROHARU , NAGAMUNE AKIO , MURAKAMI YOSHIHIRO
IPC分类号： G01N27/83
摘要： PROBLEM TO BE SOLVED: To provide a device for detecting a magnetic flux resulted from a minute defect present in a material to be inspected or a minute iron powder or the like included in the material to be inspected with high sensitivity and high S/N. SOLUTION: A magnet 2 for magnetizing the material to be inspected 1 is provided in the vicinity of the material 1 traveling an arrowed direction, and the magnetic flux from its magnetic poles N and S magnetize the material 1 to a value close to a saturated magnetic flux density. Three magnetic sensors S1, S2 and S3 are provided at equal intervals in the middle of the magnetic poles N and S. In (B), three probe coils are used as the magnetic sensors and connected so that S1 and S3 at both ends of the three probe coils are in the same phase and the central S2 in the reverse phase, and the connecting wire is connected to a preamplifier 3. S1 and S3 have the same number of turns, and the number of turns of S2 is set to two times this number of turns. The voltage corresponding to the difference between the sum of leakage the magnetic fluxes detected by the magnetic sensors S1 and S3 and two times the magnetic flux detected by the magnetic sensor S2 is inputted to the preamplifier 3 and amplified.

2. 发明专利

JP2002106286A PROPULSION HEAD POSITION AND DIRECTION MEASURING METHOD AND PROPULSION HEAD POSITION AND DIRECTION MEASURING INSTRUMENT 失效
公开(公告)号：JP2002106286A
公开(公告)日：2002-04-10
申请号：JP2000296755
申请日：2000-09-28
申请人： NIPPON KOKAN KK
发明人： NAGAMUNE AKIO , TEZUKA KOICHI , ARAKI OSAMU
IPC分类号： E21D9/06 , G01C15/00
摘要： PROBLEM TO BE SOLVED: To measure the position of a propulsion head accurately even upon spatially disturbed magnetism. SOLUTION: A propulsion head position and direction measuring instrument comprises a first magnetic field detector 101 mounted on the point of an underground propulsion head 100, a second magnetic field detector 102 positioned in the same propulsion head 100 at a fixed backward interval from the first magnetic field detector, a gravitational acceleration direction detector 110 for measuring the attitude of the propulsion head, a propulsion distance measurer 120 for measuring the propulsion distance of the propulsion head 100, and an arithmetic processor 130 for computing the horizontal position and depth position of the propulsion head on the basis of detection results by the detectors.

3. 发明专利

JP2002021476A ELECTRIC WIRE CONNECTING STRUCTURE FOR DRILL PIPE FOR USE IN NON-CUT PIPE LAYING METHOD 失效
公开(公告)号：JP2002021476A
公开(公告)日：2002-01-23
申请号：JP2000209825
申请日：2000-07-11
申请人： NIPPON KOKAN KK
发明人： ARAKI OSAMU , TAKASU NOBUO , NAGAMUNE AKIO , TEZUKA KOICHI
IPC分类号： E21D9/06 , E21D9/08 , F16L1/024 , H01R13/631 , H02G15/08
摘要： PROBLEM TO BE SOLVED: To provide an electric wire connecting structure for a drill pipe for use in a non-cut pipe laying method, which can carry out connecting work of multi-core wires arranged in the drill pipe easily and within working hours required for extension of the drill pipe. SOLUTION: According to the electric wire connecting structure for the drill pipe for use in the non-cut pipe laying method, a male connector 6 is arranged on one end of the drill pipe 1. The male connector 6 has a plug 9 inserted therein, which is formed of a plurality of circular electrodes 8a to 8d concentrically arranged about an axial line of the drill pipe 1. On the other hand, a female connector 7 is arranged on the other end of the drill pipe 1. The female connector 7 has a jack 11 inserted thereto, which is formed of a plurality of circular electrodes 10a to 10d concentrically arranged about the axial line of the drill pipe 1. The electrodes 10a to 10d are energized upon contact with the respective electrodes 8a to 8d of the plug 9 of the drill pipe 1 adjacent to the drill pipe 1 concerned. Thus, the plug 9 of the male connector 6 is inserted into the jack 11 of the female connector 7.

4. 发明专利

JP2000275219A LEAKAGE FLUX FLAW DETECTING METHOD 失效
公开(公告)号：JP2000275219A
公开(公告)日：2000-10-06
申请号：JP7733299
申请日：1999-03-23
申请人： NIPPON KOKAN KK
发明人： KATO HIROHARU , YOTSUTSUJI JUNICHI , NAGAMUNE AKIO
IPC分类号： G01N27/83
摘要： PROBLEM TO BE SOLVED: To provide a leakage flux flaw detecting method for a ferromagnetic metal specimen capable of detecting a fine flaw with high detection precision. SOLUTION: A magnetic flaw detecting device 4 is installed along a conveyance path of a steel sheet 1. This magnetic flaw detecting device 4 is mainly constituted of magnetizers 5a, 5b, magnetic sensors 6a, 6b and a signal processor 8. The magnetizers 5a, 5b are excited by an AC power supply 7a(frequency f1) and an AC power supply 7b(frequency f2) respectively, where f1

5. 发明专利

JP2000055649A DEVICE FOR MEASURING LENGTH OF MOVING BODY 失效
公开(公告)号：JP2000055649A
公开(公告)日：2000-02-25
申请号：JP22182198
申请日：1998-08-05
申请人： NIPPON KOKAN KK
发明人： NAKAMOTO SHIGEMI , NAGAMUNE AKIO
IPC分类号： G01B11/00 , G01B21/06
摘要： PROBLEM TO BE SOLVED: To enhance reliability of length measurement for a moving body. SOLUTION: This measuring device is provided with a rear end detector 3 and front end detectors 4 for detecting a rear end 1b and a front end 1a of a moving body 1, a speed detector 5 for detecting a moving speed, a lapse time measuring instrument 10 for counting the lapse of time after the front end is detected, and a moving body-length calculating part. The device is provided with a present length calculating part 14 for calculating the length of the moving body 1 in respective times based on the number of the front end detectors 4 by which the front end is already detected at the respective times and their specified distance L, and based on a lapse time (t) after a detection time in the front end detector 4 by which the front end is detected at last at the respective times and its moving speed, a detector predicting part 17 for predicting the front end detector 4 to detect the front end next, and a detection result determining part 11 for suspending calculation operation of the moving body-length calculating part when the front end detector 4 other than the predicted front end detector 4 detects the front end.

6. 发明专利

JP2789968B2 失效
公开(公告)号：JP2789968B2
公开(公告)日：1998-08-27
申请号：JP29610292
申请日：1992-11-05
申请人： NIPPON KOKAN KK
发明人： NAGAMUNE AKIO , TEZUKA KOICHI , INOKUCHI KAZUNARI , YAMADA TAKEO
IPC分类号： G01K11/12 , G01M11/00 , G01S17/32

7. 发明专利

JPH09274017A METHOD AND APPARATUS FOR DETECTING FLAW OF METAL ELEMENT 失效
公开(公告)号：JPH09274017A
公开(公告)日：1997-10-21
申请号：JP8350896
申请日：1996-04-05
申请人： NIPPON KOKAN KK
发明人： KATOU HIROHARU , YOTSUTSUJI JUNICHI , NAGAMUNE AKIO
IPC分类号： G01N27/90
摘要： PROBLEM TO BE SOLVED: To detect a minute flaw incapable of being sufficiently detected by a conventional eddy current flaw detection method. SOLUTION: Two eddy current sensors 12a, 12b are provided so as to hold a steel panel 11 therebetween and excited by exciting AC power supplies 20a, 20b. The detection signals from the eddy current sensors are detected in phase by phase detectors 15a, 16b and become eddy current flaw detection signals through band-pass filters 17a, 17b. Two eddy current flaw detection signals are multiplied by a multiplier 18 to be improved in an S/N ratio. A judging circuit 19 judges the presence and grade of a flaw on the basis of the signals improved in the S/N ratio.

8. 发明专利

JPH0989843A METHOD AND APPARATUS FOR EDDY CURRENT FLAW DETECTION 失效
公开(公告)号：JPH0989843A
公开(公告)日：1997-04-04
申请号：JP24622995
申请日：1995-09-25
申请人： NIPPON KOKAN KK
发明人： YOTSUTSUJI JUNICHI , KATOU HIROHARU , NAGAMUNE AKIO
IPC分类号： G01N27/90
摘要： PROBLEM TO BE SOLVED: To provide method and apparatus for eddy current flaw detection in which a flaw extending in same direction as the arranging direction of secondary coil can be detected as well as a single flaw or a flaw extending perpendicularly to the arranging direction of secondary coil while being discriminated. SOLUTION: A plurality of E type eddy current flaw sensors 11-13 are arranged perpendicularly to the arranging direction of poles. The difference signal of outputs from two secondary coils 11b and 11c, 12b and 12c, 13b and 13c in each eddy current flaw sensor and the difference signal of outputs from two secondary coils 11c and 12c, 12c and 13c in different eddy current flaw sensor are detected and the flaw of a material to be inspected is detected based on these difference signals.

9. 发明专利

JPH08292175A METHOD AND DEVICE OF ULTRASONIC INSPECTION 失效
公开(公告)号：JPH08292175A
公开(公告)日：1996-11-05
申请号：JP9560595
申请日：1995-04-20
申请人： NIPPON KOKAN KK
发明人： OKUNO RYUICHI , NAGAMUNE AKIO
IPC分类号： G01N29/04 , G01N29/10
摘要： PURPOSE: To provide a method and a device for inspecting with an ultrasonic wave capable of enhancing both of inspection accuracy and inspection efficiency. CONSTITUTION: The method and device comprises transmission wave generating means 42, 49 that alternately generate, as transmission waves, chirp waves each of which frequency shifts in a prescribed range and in which increasing directions of shifting frequencies are opposite to each other for every constant cycle, reference wave generating means 47, 50 that continuously generate, as reference waves, chirp waves of which increasing directions of shifting frequencies are identical to the transmission waves during the cycles, a transmitting means 43 that transmits the transmission waves to an ultrasonic wave probe and a relative operation means 46 that executes the relative operation of received waves of the ultrasonic wave probe and reference waves and utilizes a signal that is pulse-pressed after the relative operation for inspection of a specimen.

10. 发明专利

JP2520042B2 失效
公开(公告)号：JP2520042B2
公开(公告)日：1996-07-31
申请号：JP25008290
申请日：1990-09-21
申请人： NIPPON KOKAN KK
发明人： NAGAMUNE AKIO , TEZUKA KOICHI
IPC分类号： G01V3/30 , G01V3/12

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