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1. 发明专利

JPH11108908A NOISE FILTERING METHOD 失效
公开(公告)号：JPH11108908A
公开(公告)日：1999-04-23
申请号：JP27170597
申请日：1997-10-03
申请人： JAPAN STEEL & TUBE CONSTR
发明人： TSUCHIYA KENICHIRO , OTANI YASUHIRO
IPC分类号： G01N29/44 , G01N29/04 , G01N29/22 , H04R1/00
摘要： PROBLEM TO BE SOLVED: To obtain a noise filtering method in which a noise at a frequency band identical to that of ultrasonic waves can be filtered out surely by a method wherein peak values of respective waveforms by detecting and recording a specific signal a plurality of numbers of times are compared at a prescribed timing and a minimum value is extracted. SOLUTION: A specific signal S from which a noise is to be filtered out is detected a plurality of numbers of times, e.g. twice, and waveforms of respective detected signals S1, S2 are recorded. Then, peak values of the respective waveforms of the respective detected signals S1, S2 are compared at a prescribed timing, a minimum value is extracted, and a signal S4 is obtained. In the signal S4, a minimum peak value out of effective components e1, e2 which are generated in the respective detected signals S1, S2 at an identical timing, i.e., the effective component e2, is left. In addition, noise components a1, a2 in the respective detected signals S1, S2 are generated at different timings. As a result, when the noise components a1, a2 are compared at an identical timing so as to extract the smaller noise component, a peak value 0 in which the noise components a1, a2 are not contained is extracted, and the noise components a1, a2 are filtered out.

2. 发明专利

JP2000084462A PIPE INTERIOR CLEANING APPARATUS, PIPE INTERIOR COATING APPARATUS AND METHOD 失效
公开(公告)号：JP2000084462A
公开(公告)日：2000-03-28
申请号：JP25773398
申请日：1998-09-11
申请人： JAPAN STEEL & TUBE CONSTR
发明人： FUKUSATO TORU , OHAMA HIROYUKI , WATANABE MASAAKI , OTANI YASUHIRO
IPC分类号： B08B9/04 , B05C7/08 , B05C9/10 , B23K37/08
摘要： PROBLEM TO BE SOLVED: To form a coating film of good quality by certainly removing the flux bonded to the inner surface of a weld-joint part and certainly scattering solventless resin paint. SOLUTION: In polishing cleaning work, a polishing cleaner 3 gradually retreats and a rotary disk 36 to which a chipping means 37 and a buff processing means 38 are attached is rotated and the leading ends of a plurality of the chippers 375 arranged at the leading end part of the chipping means 37 move while coming into contact with the vicinity of a weld part or the surface of a rear wave bead to remove flux or spatter to remove processing refuse such as flux or slag peeled from the polishing cleaning brush 385 of the buff processing part 38 from the inner surface of a pipe. When coating work is started, a coating material is dripped on an impeller and finely scattered by the centrifugal force due to the rotation of the impeller and the chevron- shaped parts formed to the leading end part of the impeller to form a homogenous coating film on the inner surface of the pipe.

3. 发明专利

JPH1082766A ULTRASONIC FLAW DETECTOR AND UNIT FOR ASSISTING DISCRIMINATION OF DEFECT 失效
公开(公告)号：JPH1082766A
公开(公告)日：1998-03-31
申请号：JP19237697
申请日：1997-07-17
申请人： JAPAN STEEL & TUBE CONSTR
发明人： TSUCHIYA KENICHIRO , OTANI YASUHIRO
IPC分类号： G01N29/04 , G01N29/22 , G01N29/30 , G01N29/44 , G01N29/10
摘要： PROBLEM TO BE SOLVED: To enhance inspection accuracy of defect while shortening the data processing time by discriminating whether a reflection echo corresponding to a discontinuous part in an area, where a defect may be present, is a defect echo or not. SOLUTION: A cell generating means 21 projects a discontinuous part at a position corresponding to a reflection echo from an object 3 to be inspected onto an identical plane and generates a range, where the discontinuous part is continuous on the identical plane, as a cell. Means 22 set an area where a defect judged to be present from a distribution of generated cells. Means 23 discriminater whether a reflection echo corresponding to the discontinuous part in an area, where a defect may by present, is a defect echo or not. Means 24 display the area, where a defect is present and a defect echo. A correction means 25 corrects outputs from the means 22, 23. According to the arrangement, defect discrimination processing can be carried out automatically and accurately in a short time.

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