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1. 发明专利

JPH04276538A METHOD AND APPARATUS FOR DIAGNOSING RUBBING OF ROTARY MACHINE 失效
公开(公告)号：JPH04276538A
公开(公告)日：1992-10-01
申请号：JP3647191
申请日：1991-03-04
申请人： HITACHI LTD , HITACHI ENG SERVICE , TODEN SEKKEI KK
发明人： YONEYAMA TAKAO , SATO KAZUYA , YANAGIBASHI MINORU , INOUE HIDENORI , MATSUMURA YUZO , FUKAZAWA TATSUAKI , NISHIMURA TADAO , ASAMI TORU
IPC分类号： G01H17/00 , G01M13/04 , G01M99/00 , G01N29/14
摘要： PURPOSE:To detect rubbing phenomenon highly accurately and to assess the generating position highly accurately regardless of the rotating speed of a rotary body. CONSTITUTION:AE sensors 3a and 3b are mounted on bearing parts 2a and 2b which are located at both ends of the rotary shaft of a rotary body 1. The AE signal levels obtained from the AE sensors 3a and 3b are made constant in amplifiers 4a and 4b. The frequencies of the signals are analyzed in a rubbing diagnosing and processing part 7 through detectors 5a and 5b. The rotating frequency components of the rotary body 1 are extracted with filters 10a and 10b. Therefore, in the rubbing diagnosing and processing part 7, the presence or absence of the occurrence of the rubbing phenomenon can be judged based on the result of the frequency analysis and the rotating frequency component. The position where the rubbing phenomenon occurs can also be assessed.

2. 发明专利

JPH11351531A EQUIPMENT AND METHOD OF BURNING REFUSE 失效
公开(公告)号：JPH11351531A
公开(公告)日：1999-12-24
申请号：JP16227998
申请日：1998-06-10
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： YANAGIBASHI MINORU , OKUDA NAOKI , KIMURA TAKASHI , KATO AKIRA
IPC分类号： F23G5/027 , B09B3/00 , F23G5/16
摘要： PROBLEM TO BE SOLVED: To provide equipment and method of burning refuse capable of reducing operating cost in decomposing and decreasing dioxin. SOLUTION: Refuse burning equipment includes a primary combustion chamber 2 for primary combustion of refuse, a catalytic burner 14 for burning by catalysis elements that have not been burnt in the primary combustion chamber 2, a secondary combustion chamber 3 for subjecting the refuse to secondary combustion with gas that has reached a high temperature through the catalytic combustion so as to decompose and retain dioxin, a cooler 5 for cooling the gas, and a dust remover 8 for removing dust from the cooled gas.

3. 发明专利

JPH09166483A METHOD AND APPARATUS FOR MONITORING EQUIPMENT 失效
公开(公告)号：JPH09166483A
公开(公告)日：1997-06-24
申请号：JP33009395
申请日：1995-12-19
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： UENO YUICHIRO , SENOO MAKOTO , INOUE HIDEKI , NAKAMURA HIDEO , YANAGIBASHI MINORU , NAKAYAMA MICHIO
IPC分类号： G01M99/00 , G01H17/00 , H02H5/00 , G01M19/00
摘要： PROBLEM TO BE SOLVED: To enhance the detection sensitivity of an abnormality by a method wherein the frequency-spectrum analyzed result of a normal sound is subtracted from the frequency spectrum of a monitored sound and only the component of an abnormal sound and a disturbance sound is extracted. SOLUTION: An acoustic signal which is generated by an object 10 to be monitored is detected by a sound detection part 20, and the detected acoustic signal is 1/3-octave-analyzed by a monitored-sound frequency analysis part 30. A frequency-spectrum subtraction part 50 subtracts a normal-state 1/3 octave pattern stored in a normal-state sound frequency spectrum storage part 40 from the 1/3-octave pattern of a monitored sound. The output of the subtraction part 50 by this subtraction becomes the analytical pattern of only an abnormal sound or a disturbance sound, and the pattern of only the abnormal sound or the disturbance sound and every pattern which is stored in a disturbance sound-frequency spectrum storage part 60 in advance are collated by a similarity computing part 70. A sound monitoring part 80 to which a collated result is input removes the disturbance sound or judges the existence of an abnormal sound on the basis of the collated result. Thereby, the detection sensitivity of an abnormality can be enhanced.

4. 发明专利

JPH11318783A DEVICE AND METHOD FOR RECOVERING MICRO FOREIGN MATTER IN BODY 失效
公开(公告)号：JPH11318783A
公开(公告)日：1999-11-24
申请号：JP13800098
申请日：1998-05-20
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： YASU HIDEYUKI , YANAGIBASHI MINORU , NISHIZAWA GIICHI , FUJIWARA FUKUO
IPC分类号： A47L9/04 , B25J9/00 , B25J19/04
摘要： PROBLEM TO BE SOLVED: To provide a device and method for recovering micro foreign matter capable of recovering micro foreign matter in a body by remote control. SOLUTION: This device is provided with a camera system 3 which is equipped for a manipulator driving device 1, is provided with a camera to pick up the images of the interior of body, and outputs the image pickup signals of the camera to an image pickup monitor 4 via a camera cable. The device is constituted of a suction nozzle device 6 provided with a suction nozzle to suck micro foreign matter in a body, an air hose in parallel with the camera cable, and a suction driving source to generate a suction force in the suction nozzle.

5. 发明专利

JPH09229762A METHOD AND APPARATUS FOR MONITORING OF ABNORMALITY OF INSTRUMENT 失效
公开(公告)号：JPH09229762A
公开(公告)日：1997-09-05
申请号：JP3657696
申请日：1996-02-23
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： UENO YUICHIRO , SENOO MAKOTO , YANAGIBASHI MINORU , NAKAYAMA MICHIO , NAKAMURA HIDEO
IPC分类号： G01M99/00 , G01H3/08 , G01H17/00 , G01M19/00
摘要： PROBLEM TO BE SOLVED: To provide a method and an apparatus for monitoring of a plurality of instruments by sound, which remove a disturbance sound and detect various abnormal sounds with high sensitivity. SOLUTION: In a preliminary experiment, sound power at the monitoring frequency of a normal sound is analyzed statistically (Steps 101 to 103), the threshold value of acoustic power for abnormality detection is set at a value in which an acoustic-power change width is added to the man value of the normal sound, and the acoustic-power change width is decided in such a way that the abnormality sound is not detected erroneously (Step 104). In addition, on the basis of a plurality of disturbance sounds, to be removed, which are decided by the duration time and by the acoustic power at the monitoring frequency, the disturbance sound in which the product of the duration time by the acoustic power becomes a maximum value is selected (Steps 105 to 107), the maximum value of the product of the duration time by the acoustic power is divided by the acoustic-power change width, and the averaging time of the acoustic power is preliminary decided (Step 108).

6. 发明专利

JPH0658911A METHOD AND DEVICE FOR PREDICTING LIFE OF HIGH-TEMPERATURE EQUIPMENT BY MAGNETIC AE 失效
公开(公告)号：JPH0658911A
公开(公告)日：1994-03-04
申请号：JP20884692
申请日：1992-08-05
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： SATO KAZUYA , YONEYAMA TAKAO , SUKEGAWA MASAYUKI , FUKUI HIROSHI , YANAGIBASHI MINORU , TAN TOSHIMI , ARAYA NOBORU
IPC分类号： G01N3/32 , G01N27/72 , G01N29/14
摘要： PURPOSE:To enable a turbine structure to be exchanged before breakdown by diagnosing its remaining life accurately. CONSTITUTION:The correlation relationship between the magnetic AE characteristic value and the degree of creep damage by previously performing a creep test with a same material test piece as that of a turbine structure which is manufactured by a magnetic metal, thus obtaining the magnetic AE characteristic value of the turbine structure to be measured. The degree of creep damage is obtained from the magnetic AE characteristic value and the correlation relationship and the remaining life of the turbine structure to be measured is diagnosed from the degree of creep damage. With the correlation relationship between the magnetic AE characteristic value and the degree of creep damage. the change in the magnetic AE characteristic value increases as the degree of creep damage to be measured approaches '1' indicating rupture, thus predicting the remaining life at the latter period of the life accurately.

7. 发明专利

JPH10281921A METHOD AND DEVICE FOR MONITORING LEAKAGE OF GAS PIPING 失效
公开(公告)号：JPH10281921A
公开(公告)日：1998-10-23
申请号：JP8809497
申请日：1997-04-07
申请人： HITACHI LTD , TOKYO GAS CO LTD , HITACHI ENG SERVICE
发明人： UENO YUICHIRO , SENOO MAKOTO , YANAGIBASHI MINORU , KATO SHUICHI , WAKASA KIYOUSUKE
IPC分类号： G01M3/24
摘要： PROBLEM TO BE SOLVED: To detect the fine leakage of a gas piping or the leakage which was undetectably buried in a noise and plot its position. SOLUTION: A pressure wave from a pressure wave generating device 60 is injected into a gas piping to excite the fluctuation in the leakage sound of a gas leakage point Z, and the leakage sound intensified in amplitude and fluctuated in cross correlation is detected by two microphones 11, 12 set in the piping. The cross correlation value is calculated by a cross correlation calculating part 30 from the two A/D converted detection signals. A computer 40 reads the peak value of the correlation values by a delay time calculating part 42, judges gas leakage when it is a threshold or more, and standardizes the leakage position X of gas from the delay time of peak value or the time difference of the microphones 11, 12.

8. 发明专利

JP2000028119A REFUSE INCINERATOR AND INCINERATING METHOD 失效
公开(公告)号：JP2000028119A
公开(公告)日：2000-01-25
申请号：JP19837598
申请日：1998-07-14
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： KATO AKIRA , YAMASHITA HISAO , YANAGIBASHI MINORU
IPC分类号： F23J15/06 , F23G5/16 , F23J15/00
摘要： PROBLEM TO BE SOLVED: To decompose and remove dioxins and precursors thereof in incineration exhaust gas efficiently by subjecting refuse to primary incineration, branching a part of combustion exhaust gas and admixing with fuel, burning the mixture on a catalyst to produce hot gas, adding the exhaust gas after primary combustion to the high temperature gas and then performing secondary combustion. SOLUTION: A part of combustion exhaust gas from a primary combustor 1 is branched and incorporated with fuel and air, as required, before being introduced to a catalyst combustor 3. Hot gas of 800-1300 deg.C produced from the catalyst combustion 3 is then added to exhaust gas from the primary combustor 1 so that dioxins and precursors thereof are burnt and decomposed by a secondary bombustor 2. Subsequently, the exhaust gas is quenched by a cooler 4 down to 200 deg.C or below in order to prevent recombination of dioxins and discharged from a chimney 6 after dust is removed by a dust remover 5. According to the arrangement, dioxins in the exhaust gas from a refuse incinerator can be decreased and generation of NOx can be suppressed to the lowest possible.

9. 发明专利

JPH05231361A METHOD AND DEVICE FOR DIAGNOSING OIL-FREE SCREW COMPRESSOR 失效
公开(公告)号：JPH05231361A
公开(公告)日：1993-09-07
申请号：JP3937492
申请日：1992-02-26
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： TANAKA KOICHI , KUMABE HIROFUSA , SATO KAZUYA , YONEYAMA TAKAO , YANAGIBASHI MINORU
IPC分类号： F04C18/16
摘要： PURPOSE:To easily and quantitatively diagnose contact with the counter rotors of an oil-free screw compressor based on an AE wave and a rotational pulse. CONSTITUTION:An AE wave from a compressor 1 is detected by an AE sensor 2, detected to be amplified by a preamplifier 3 and a main amplifier 4 and frequency-analyzed and addition mean-processed by a processing device 6, to compare an AE voltage level, synchronized with a rotatioal pulse from a rotor rotational pulse detector 5 of this compressor, with the decision reference in an evaluation output device 7, and to perform a diagnosis output of such as whether rotor contact is provided or not.

10. 发明专利

JPH05172696A DEVICE FOR DIAGNOSING ABNORMALITY OF VALVE MEACHANISM 失效
公开(公告)号：JPH05172696A
公开(公告)日：1993-07-09
申请号：JP34438891
申请日：1991-12-26
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： SATO KAZUYA , YONEYAMA TAKAO , SATO MINORU , NAKAZAWA TOSHIO , YANAGIBASHI MINORU
IPC分类号： G01M13/00 , G01N29/14
摘要： PURPOSE:To diagnose the abnormality of a valve at an early stage by providing an acoustic emission(AE) sensor for detecting an elastic wave to a part of a valve mechanism and extracting the characteristics of the detection signal from the AC sensor. CONSTITUTION:The cooling medium entering the compression chamber 3 of a scroll compressor 1 from the suction port 3 thereof is compressed by scrolls 4 to be emitted from an emitting orifice 6 through a check valve 5. An AE sensor 8 for detecting an elastic wave is arranged to the case 7 of the compressor 1 in order to monitor the operation state of the check valve 5. The output of the AE sensor 8 is amplified by an amplifier 9 and processed in an AE signal characteristic extraction part 10 to be diagnosed in an abnormality judging part 11, and the judgment is displayed on a display part 12. The output signal of the abnormality judging part 1 is inputted to a compressor control part 13 and, when a signal of resonance abnormality or valve abnormality is generated, suction pressure or emission pressure is controlled to hold a normal operation state.

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