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1. 发明专利

JPH067191B2 失效
公开(公告)号：JPH067191B2
公开(公告)日：1994-01-26
申请号：JP18846986
申请日：1986-08-13
申请人： HITACHI LTD
发明人： NAGASHIMA HIDEAKI , KAWADA YOSHINARI , HIRAKAWA HIROMASA , KONNO MUTSUO , NAKAMURA SHOZO , SHIOHATA HIRONORI , HASEGAWA KUNIO , HIGUCHI SHIGEO
IPC分类号： G21C3/34

2. 发明专利

JPH04218764A DETECTING DEVICE OF DETERIORATION AND DAMAGE OF METAL MATERIAL 失效
公开(公告)号：JPH04218764A
公开(公告)日：1992-08-10
申请号：JP23906190
申请日：1990-09-11
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , TAKAKU KAZUO , SUTEEBUN EBANSON , HASEGAWA KUNIO
IPC分类号： G01N27/82 , G01R33/035 , G01R33/14
摘要： PURPOSE:To enable precise and nondestructive detection of the degree of deterioration and the degree of damage of a material to be inspected, by impressing a minute alternating-current magnetic field on the material locally while impressing thereon a direct-current magnetic field widely and uniformly, and by detecting a change in the magnetic flux density of the material. CONSTITUTION:A direct-current magnet 10, a magnetic sensor 11 and a small- sized alternating-current magnet 12 are arranged from above and put in one body by a sensor holder 100 formed of a nonmagnetic insulative material. A minute alternating-current magnetic field is impressed for excitation on a material 40 pipe to be inspected, by the magnet 12 disposed near the material 40, while a base magnetic field is impressed on the material by the magnet 10. The magnet 12 is driven by a low frequency of several hertz or below on the occasion so as to prevent generation of an eddy current. Then, a minute change in magnetism accompanying deterioration and damage of the material 40 to be inspected is detected by the magnetic sensor 11 and the degree of deterioration and the degree of damage of the material 40 are determined from data on the change.

3. 发明专利

JPH04125463A MEASURING METHOD FOR CHANGE IN PHYSICAL PROPERTY OF METAL OBJECT 失效
公开(公告)号：JPH04125463A
公开(公告)日：1992-04-24
申请号：JP24399990
申请日：1990-09-17
申请人： HITACHI LTD
发明人： HASEGAWA KUNIO , SUGANO SATOSHI , ENOMOTO KUNIO , HAYASHI MAKOTO , OTAKA MASAHIRO
IPC分类号： G01N27/72
摘要： PURPOSE:To enable a rapid non-destructive detection of degree of deterioration of a metal material which is used at a high temperature for a long period of time to be made under environment of radiation rays by measuring magnetic characteristics of an object to be measured as a detection of magnetic hysteresis with one or more magnetic sensors. CONSTITUTION:A plurality of magnetic sensors 10-1 and 10-2 are placed so that they contact an object to be measured 1. These sensors 10-1 and 10-2 receive same amount of radiation rays from the object to be measured 1. Then, the object to be measured 1 is locally excited by an excitation coil 12 of the sensor 10-1 and residual magnetism, magnetism-retaining force etc. are measured by the sensor 10-1 only, thus enabling influence of radiation rays to be separated from measurement of the sensor 10-1, output of only magnetic field of the object to be measured 1 to be obtained, and degree of the again deterioration to be obtained quantitatively from degree of fragility and interrelation of magnetic properties.

4. 发明专利

JPH03177685A SOCKET JOINT PIPING CONNECTING METHOD 失效
公开(公告)号：JPH03177685A
公开(公告)日：1991-08-01
申请号：JP31526889
申请日：1989-12-06
申请人： HITACHI LTD
发明人： HASEGAWA KUNIO , SUGANO SATOSHI , KIMOTO HIROSHI , HAYASHI MAKOTO , ENOMOTO KUNIO , SAITO HIDEYO , KAWABATA JUNICHI
IPC分类号： F16L13/02
摘要： PURPOSE:To prevent crack generated from a gap part by providing a space formed by the inner peripheral wall of a large diameter pipe and the outer peripheral wall of a small diameter pipe, and flattening the shape of the fillet part of weld metal. CONSTITUTION:The inside of a large diameter pipe is machined in such a way as to allow the insertion of a small diameter pipe 2 therein. The entrance part and the back part with which the end of the small diameter pipe 2 is brought into contact are formed to be equal to the outer diameter of the small diameter pipe 2, and the inner diameters of the other parts are formed to be larger than the outer diameter of the small diameter pipe 2. Connecting both pipes by welding in this state, a space is formed between the large diameter pipe 1 and small diameter pipe 2, and the shape of the fillet part of weld metal 3 is flattened. As a result, stress acting upon the welded part is reduced, and crevice corrosion caused by the stagnation of a fluid flowing in the pipe can be prevented, as well as the leak of the fluid flowing in the pipe due to crack generated from the welded part can be prevented.

5. 发明专利

JPH0337563A FOREIGN-MATERIAL INSPECTING APPARATUS 失效
公开(公告)号：JPH0337563A
公开(公告)日：1991-02-18
申请号：JP17179689
申请日：1989-07-05
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , TAKAKU KAZUO , NAKAJIMA JUNJIRO , UMEZAWA SADAO , SUGANO SATOSHI , HASEGAWA KUNIO , ENOMOTO KUNIO , SHIMIZU TASUKU
IPC分类号： G01N27/72 , G21C17/06
摘要： PURPOSE:To detect a foreign material mixed into a fuel assembly quickly by scanning an exciting device which excites the foreign material mixed in the fuel assembly and a magnetism detecting device which detects the remnant magnetism which remains in the foreign material after the excitation, and operating the measured data. CONSTITUTION:A fuel assembly 1 is suspended in the water in a pit 2 such as an inspecting pit or used-fuel pit with a crane hook 23. A vertical movement rail 22 is provided from a crane 21 which is otherwise provided on a crane rail 20. A visual inspecting device 60 on which a TV camera and the like are mounted is guided and moved along the axial direction of the fuel assembly 1. In the visual inspecting device 60, an ultrasonic wave shaker 30 having a driving device, a magnetism sensor 40 and an exciting device 50 are provided. The exciting device 50 excites foreign material mixed in the fuel assembly 1 to the specified value. The magnetism sensor 40 detects the remnant magnetism which remains in the foreign material after the excitation. An operating device 7 judges the foreign material based on the measured data and displays the result on an output device 8.

6. 发明专利

JPH02213764A DEFECT INSPECTING DEVICE 失效
公开(公告)号：JPH02213764A
公开(公告)日：1990-08-24
申请号：JP3360889
申请日：1989-02-15
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , TAKAKU KAZUO , HASEGAWA KUNIO , YOSHIMURA TOSHIHIKO , ISHIKAWA YUICHI , OGUCHI YUKO , HIRANO AKIHIKO , SHIMIZU TASUKU
IPC分类号： G01R33/12 , G01N27/82
摘要： PURPOSE:To obtain a SQUID measuring system which operates stably in a sweeping magnetic field and can detect corrosion and cracks by feeding back the output signal of the SQUID to the pickup coil of the SQUID. CONSTITUTION:A cryostat 40 housing a superconducting coil as an excitation coil 20, an SQUID sensor 50, a pickup coil 51, and a magnetic body 60 for balancing is disposed in the upper part of a measuring body 1. A refrigerant 41, such as liquid He, is packed in the cryostat 40 and is kept at the working temp. of the SQUID element 50 and the superconducting excitation coil 20. The excitation coil 20 is controlled by an excitation controller 21 and impresses a cyclic magnetic field to the measuring body 1. The previously determined magnetic characteristics when there are no corrosion and cracks are previously stored in a data base 72 and the degrees of the cracks and corrosion of the measuring body 1 are decided from the comparison and computation of the data measured with an arithmetic device 70 and the data base 72.

7. 发明专利

JPH0278948A DEVICE AND METHOD FOR INSPECTING DETERIORATION DAMAGE OF METALLIC MATERIAL 失效
公开(公告)号：JPH0278948A
公开(公告)日：1990-03-19
申请号：JP22873888
申请日：1988-09-14
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , TAKAKU KAZUO , YOSHIMURA TOSHIHIKO , ISHIKAWA YUICHI , HASEGAWA KUNIO , ENOMOTO KUNIO , SHIMIZU TASUKU
IPC分类号： G01R33/12 , G01N27/82
摘要： PURPOSE:To accurately detect the extent of deterioration without any destruction by using a data base of the relation between variation of magnetic characteristics such as saturated magnetism, residual magnetism, coercive force, etc., and the damage and deterioration of a metallic material. CONSTITUTION:Measurement data of an exciting coil 21, a magnetic sensor 31, and a driving device 41 are inputted to a magnetic arithmetic unit 51 through controllers 22, 32, and 42. The input data are inputted to an input memory 511 and outputted on a magnetic data display device 512, and the measurement state is checked. Further, basic magnetic data on respective materials are inputted from the magnetism data base 52. Then a magnetic field analytic arithmetic unit 513 analyzes a magnetic field and the data are processed by anisotropy data processing 517 and data processing 516 for the depth direction of the magnetic characteristics. Those data are inputted to a deterioration arithmetic unit 61 to accurately detect the extent of the deterioration of the metallic material which is used at high temperature without any destruction.

8. 发明专利

JPS63236995A NUCLEAR FUEL AGGREGATE 失效
公开(公告)号：JPS63236995A
公开(公告)日：1988-10-03
申请号：JP7069787
申请日：1987-03-25
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NAKAMURA SHOZO , SHIOHATA HIRONORI , HASEGAWA KUNIO , SUGANO SATOSHI , NAGASHIMA HIDEAKI , HIRAKAWA HIROMASA , KAWADA YOSHINARI , YANAGI YOSHIHIKO , AIZAWA YASUHIRO
IPC分类号： G21C3/324 , G21C3/30 , G21C3/33

9. 发明专利

JPS63210610A PIPE INSPECTION METHOD 失效
公开(公告)号：JPS63210610A
公开(公告)日：1988-09-01
申请号：JP4263787
申请日：1987-02-27
申请人： HITACHI LTD
发明人： ENOMOTO KUNIO , OTAKA MASAHIRO , HAYASHI MAKOTO , KANNO SATOSHI , HASEGAWA KUNIO , SHIMIZU TASUKU , SAITO TAKASHI
IPC分类号： G01B21/08
摘要： PURPOSE:To simply and certainly detect the local change in the wall thickness of a pipe from outside, by detecting the temp. changes, saturation temps. and saturation time of the piping for thermal machinery by a plurality of the temp. sensors provided to the surface of said piping to compare them with each other. CONSTITUTION:Semi-annular thermometric pipes 1, 1' having a plurality of the temp. sensors 1a, 1a', 1a''... provided to the inner surfaces thereof are mounted to the outer sides of the parts to be measured of a pipe using clamp holes 1b, 1b'.... The outputs from the temp. sensors 1a, 1a', 1a''... are collected to a connector 1c and sent to an analytical part by cables and the temp. changes, saturation temps. and saturation time are detected to be compared. When the temp. of the fluid passing through the pipe is not high, the pipe is heated by the supply of a current to the parts to be measured, electromagnetic induction or the irradiation of said parts with laser beam. By this method, the state of the wall thickness of the pipe is simply detected from outside. This method is suitable for the maintenance and inspection of a steam power plant.

10. 发明专利

JPS63200093A FUEL AGGREGATE 失效
公开(公告)号：JPS63200093A
公开(公告)日：1988-08-18
申请号：JP3147487
申请日：1987-02-16
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SUGANO SATOSHI , HASEGAWA KUNIO , NAKAMURA SHOZO , KAWADA YOSHINARI , AIZAWA YASUHIRO , NAGASHIMA HIDEAKI , SHIOHATA HIRONORI , HIRAKAWA HIROMASA , YANAGI YOSHIHIKO
IPC分类号： G21C3/33 , G21C3/30

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