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61. 发明专利

JPS62266451A DEFECT INSPECTING DEVICE 失效
公开(公告)号：JPS62266451A
公开(公告)日：1987-11-19
申请号：JP10845186
申请日：1986-05-14
申请人： HITACHI LTD
发明人： HAYASHI MAKOTO , OTAKA MASAHIRO , SASAKI TSUKASA
IPC分类号： G01N27/20 , G01B7/28 , G01B7/34
摘要： PURPOSE:To detect the shape of a surface crack accurately, by providing a mechanism which can drive a potential difference measuring head in the axial and circumferential directions of a piping to detect the shape of a crack by the measurement of a potential difference distribution on the inner surface of the piping. CONSTITUTION:A measuring head 23 is provided with feeder terminals 24 and 24' for feeding a DC and measuring terminals 25 and 25' for measuring potential difference to measure a potential difference distribution about a detect. When inspecting a pipe in a wide range, the head 23 is arranged at a position facing it at 180 deg.. To scan with an inspector, a compressed air is supplied to an air cylinder 26 to press the head 23 on the inner surface of the pipe and a DC is supplied to the terminals 24 and 24' to form an electric field about a defect. The pipe is scanned circumferentially being turned by a fixed angle to measure a potential difference distribution about the defect. This enables the judging of the shape of the defect from the potential difference distribution.

63. 发明专利

JP2000235095A CONTROL ROD DRIVE MECHANISM 失效
公开(公告)号：JP2000235095A
公开(公告)日：2000-08-29
申请号：JP3743299
申请日：1999-02-16
申请人： HITACHI LTD
发明人： NAKAHARA HIROTAKA , SASAKI TSUKASA , INOUE SHINZO
IPC分类号： G21C7/16 , G21C17/10
摘要： PROBLEM TO BE SOLVED: To provide a motor-driven control rod drive mechanism using a magnetic coupler of improved reliability, capable of detecting surely step-out of the magnetic coupler from an outside of a pressure partition wall. SOLUTION: This mechanism is provided with a rotation detector 3 for detecting the rotation of a control rod driving shaft 7, wherein the control rod driving shaft 7 inside a pressure partition wall is coupled to a driving source rotary shaft outside the partition wall by a magnetic coupler to be separated with the pressure partition wall, and which comprises magnet fixed to the driving shaft 7 and a magnetism detector 31 fixed to an outer edge part of a control rod drive mechanism to be separated from the magnet by the partition wall, a rotation detector for detecting the rotation of the shaft 7, a motor 1 as a driving source, and a control means for detecting step-out of the magnetic coupler and for switching operate an electric power source for the driving source.

64. 发明专利

JPH11101630A METHOD AND APPARATUS FOR MEASURING POSITION OF BOUNDARY OF DIFFERENT SUBSTANCES BY ULTRASONIC WAVE 失效
公开(公告)号：JPH11101630A
公开(公告)日：1999-04-13
申请号：JP26324097
申请日：1997-09-29
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： WATANABE ATSUSHI , NAGASHIMA YOSHIAKI , TAKAHASHI FUMINOBU , SASAKI TSUKASA , NOMURA KEIICHI , KIKUCHI TOSHIICHI
IPC分类号： G01B17/00 , G01N29/00 , G01S7/526 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To provide a boundary position measuring method for measuring the distance to the boundary of different types of substances, from the time taken by propagation of ultrasonic waves reflected from the boundary of different types of substances and the acoustic velocity of ultrasonic waves corrected corresponding to the degree of deterioration of a medium, in the ultrasonic waves propagating in the medium. SOLUTION: The propagation time of longitudinal and transverse ultrasonic waves in a surface-reformed layer 4a is obtained by a part 6 for measuring the time taken to propagate reflected waves received by an ultrasonic sensor 1. The acoustic velocity corrected corresponding to the degree of deterioration is calculated by an acoustic velocity correcting apparatus 7 based on the correlation of the degree of the deterioration of a corrected data recording part 8a and the acoustic velocity ratio. The position of the boundary is calculated by the boundary position calculating apparatus 9, which calculates the boundary position from the corrected acoustic velocity and the propagation time.

65. 发明专利

JPH1194980A WORKING DEVICE IN NARROW PART 失效
公开(公告)号：JPH1194980A
公开(公告)日：1999-04-09
申请号：JP25645697
申请日：1997-09-22
申请人： HITACHI LTD
发明人： KAJIYAMA SHIGERU , SASAKI TSUKASA , NAKAHARA HIROTAKA , HAYATA TAKASHI
IPC分类号： G21C17/003 , B61B13/10
摘要： PROBLEM TO BE SOLVED: To ensure a sure work by using a minimum space by freely bending and fixing each joint of a multiple joint arm and rotationally driving a plurality of rotational ring. SOLUTION: To a tentative ring 35, a rotational ring 18 supported by a rotor 20 arranged in a plurality along the circumference is freely rotatably fixed, which is driven by rotating a pinion 15 gearing with a rack 73 by a motor 11 of a drive part frame 10. To a multiple joint arm 21, a probe head 22 is fixed and by elevating this, an ultrasonic probe 23 at the tip end is scanned along the outside of the pump casing 1 to inspect with ultrasonic. By rotating a pinion 60 locking with another rack 62 of a rotational ring 17, a sprocket 33 gearing with a timing belt 25 is rotated and a probe head 22 tightened to the timing belt 25 with screws 69 is elevated/lowered.

66. 发明专利

JPH0552824A SUPERSONIC INSPECTING APPARATUS FOR VERTICAL TUBE 失效
公开(公告)号：JPH0552824A
公开(公告)日：1993-03-02
申请号：JP21337491
申请日：1991-08-26
申请人： HITACHI LTD
发明人： KAJIYAMA SHIGERU , SASAKI TSUKASA , KOIKE MASAHIRO
IPC分类号： G01N29/04 , G01N29/26 , G21C17/003
摘要： PURPOSE:To attach a scanner in the vicinity of an inspecting position of a vertical tube and also rotate the scanner in direct contact with an object to be inspected so as to improve applicability and reduce a size and weight of the apparatus. CONSTITUTION:The supersonic inspecting apparatus comprises a mechanism for positioning a scanner 10 on a stub tube 4 of interest to be inspected, a mechanism for rotating the scanner in contact, with the stub tube 4 and with centers aligned with each other, a scanning arm 15 for scanning a probe 16 in an axial direction, a mechanism 26 for pressing the probe 16 to a surface to be inspected, a running control mechanism for remotely driving and controlling respective driving mechanisms, and a supersonic signal processor for processing supersonic signals. Since the scanner can be placed in the vicinity of an inspecting position, the scanner can be reduced in size and weight and can be applied irrespective of length of a vertical tube such as a housing in a pressure vessel.

67. 发明专利

JPH04344459A ACOUSTIC RECEIVING UNIT 失效
公开(公告)号：JPH04344459A
公开(公告)日：1992-12-01
申请号：JP11581991
申请日：1991-05-21
申请人： HITACHI LTD
发明人： KOIKE MASAHIRO , SAWA TOSHIYUKI , KAJIYAMA SHIGERU , SASAKI TSUKASA , TAKAHASHI FUMINOBU
IPC分类号： G01N29/14 , G01N29/22 , G01N29/44
摘要： PURPOSE:To enhance the S/N of received acoustic signals even if there is noise having regularity and/or noise which is difficult to separate using gates. CONSTITUTION:An acoustic receiving unit is comprised of a receiving element 1 and a receiver 2 for receiving acoustic signals, switches 4-6 for switching signal lines, delay circuits 7-9 for delaying received signals, memories 3, 10-12 for storing the received signals, an adding circuit 14 for adding (m+1) signals together, an addition time setting circuit 13 for setting the number m of times of the addition, and an outputter 15 for outputting the added signals. First, the receiver 2 is connected to each of the delay circuits 7-9 by the switches 4-6. The acoustic signals received by the receiving element 1 are stored in the memory 3 and the signals delayed by each delay circuit are stored in the memories 10-12. The (m+1) signals stored in the memories are added together by the adding circuit 14 and the result of the addition is output to the outputter 15.

68. 发明专利

JPH04186156A INSPECTION DEVICE FOR WALL SURFACE OF VESSEL 失效
公开(公告)号：JPH04186156A
公开(公告)日：1992-07-02
申请号：JP31389290
申请日：1990-11-21
申请人： HITACHI LTD
发明人： KAJIYAMA SHIGERU , KOIKE MASAHIRO , SATO CHIKARA , TAKAKU KAZUO , SASAKI TSUKASA
IPC分类号： G01N29/04 , G01N29/26
摘要： PURPOSE:To have stable running along the running line as target by arranging a plurality of mobile bodies, and sensing the position of the moving body accurately even though the sensing distance is long. CONSTITUTION:A relay dolly 5 fitted with sensors for moving amount and attitude, which can travel on a wall surface, is run between a reference surface device 3 to give level reference and an inspection dolly 6 equipped with sensors for moving amount, attitude, and for inspection, which is capable of traveling on the wall surface of a nuclear reactor pressure vessel 30. The position of dolly 5 relative to the reference surface device 3 is sensed, and therefrom the position of dolly 6 is sensed. Therein the device 3 having the free level of water is coupled with a pressure sensor on the dolly 5 through a water hose, and further coupling is made with a pressure sensor on the dolly 6 through water hose and reference level device mounted on the dolly 5, and thereby the positions are sensed. These are controlled by a control part 2, and the inspection signal is processed by an inspection part. In this manner, position sensing and cable processing are backed up with the dolly 5, and precise sensing of the running position and a stable running are accomplished.

69. 发明专利

JPH03104787A RUNNING CONTROL APPARATUS 失效
公开(公告)号：JPH03104787A
公开(公告)日：1991-05-01
申请号：JP24210289
申请日：1989-09-20
申请人： HITACHI LTD
发明人： KAJIYAMA SHIGERU , KOIKE MASAHIRO , SAWA TOSHIYUKI , TAKAKU KAZUO , SASAKI TSUKASA
IPC分类号： G01N29/04 , B62D57/024 , G01N29/26
摘要： PURPOSE:To run a running body precisely so as to follow an inherent running line by installing a running line detecting sensor, a liquid level detecting sensor, and a laser beam detecting sensor, an inclined angle detecting sensor and a position detecting sensor on the running body. CONSTITUTION:A welded part detecting sensor 25 mounted on a running body running on a container, detects a welded part 6 so as to run a running body the use of the detected welded part 6 for navigation. However, since there is presented a position where no detection signal can be obtained due to a small difference in metal grain boundary, another signal is used for navigation at this position, instead of the above-mentioned detection signal. That is, in the case of a circumferential direction of the container, a pressure sensor mounted on the running body detects a level of liquid so as to know the height of a welded part, and the running is controlled in accordance with the signal. Further, in the case of the vertical direction of the container, a laser beam is set on the welded seam, and is detected by a light receiving line sensor 26 mounted on the running body while the posture of the running body is detected by inclined angle sensors 30, 33 so as to control the posture of the running body.

70. 发明专利

JPS62197762A POSITION CONTROLLER FOR PROBE 失效
公开(公告)号：JPS62197762A
公开(公告)日：1987-09-01
申请号：JP3904086
申请日：1986-02-26
申请人： HITACHI LTD
发明人： SASAKI TSUKASA , NARUSE AKISUKE , TAKAKU KAZUO
IPC分类号： G01N29/04
摘要： PURPOSE:To enable accurate control of the position of a probe without the use of a copying sensor, by correcting the scanning origin position of the probe according to the tilt angle of a flaw detection arm even when the flaw detection arm is tilted following 3-D saddle-like changes of an object to be welded and a weld part of a welding object. CONSTITUTION:An ultrasonic flaw detector 11 is made up of a track 12 provided on a nozzle 9, a driver 13 running on the track 12 and a scanning section 15 for scanning a weld part 10 with a prove 14 at the right angle thereto 10. Moreover, the scanning section 15 is made up of a flaw detection arm 16, a holding section 17, a container 8 and a scan driving section 18 for pressing the arm 16 against a container 8 following 3-D saddle-like changes in the weld part 18 between the container 8 and the nozzle 9. Then, the probe 14 scans the weld part 10 parallel therewith 10 with a driver 13 running on the rail 12 by the scanning section 15 perpendicular to the weld part 10. Moreover, the position of the probe can be corrected and controlled regardless of setting condition of the nozzle 9 of the unit 11 and setting conditions of probe scanning original.

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