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1. 发明专利

JPS60249044A CURRENT COLLECTING WHEEL OF COATED FILM DAMAGE POSITION SEARCHING WHEEL 失效
公开(公告)号：JPS60249044A
公开(公告)日：1985-12-09
申请号：JP10446484
申请日：1984-05-25
申请人： NIPPON STEEL CORP , NITSUKEN KOUMU KK
发明人： YAMAGUCHI TOSHIO , KAWAKAMI MAKOTO , SHIMIZU OSAHISA , IIJIMA ISAO
IPC分类号： G01N27/07 , G01N27/20
摘要： PURPOSE:To improve a current collecting rate, and to search a coated film damage position with high accuracy by laminating alternately a holding plate made of an electric insulating material, and a conductive round rubber plate, and clamping and coupling them by many bolts and nuts which have been inserted through them. CONSTITUTION:A holding plate 1 made of an electric insulating material and a conductive round rubber plate 2 are laminated alternately, and on the periphery between both of them 1, 2, many metallic small pieces 3 are placed at an interval in the peripheral direction of the round rubber plate. Also, a conductor 4 for connecting each metallic small piece 3 is placed, the conductor 4 is connected to wheel inserting bearing metallic fittings 5 fixed to the center part of the holding plate 1, and each holding plate 1 and round rubber plate are clamped and coupled by a bolt 6 and a nut 7 which have been inserted over them.

2. 发明专利

JPS61209349A METHOD FOR DETECTING DAMAGED POSITION OF CORROSION-PROOF FILM OF EMBEDDED METAL PIPE 失效
公开(公告)号：JPS61209349A
公开(公告)日：1986-09-17
申请号：JP4939785
申请日：1985-03-14
申请人： NIPPON STEEL CORP
发明人： KAWAKAMI MAKOTO , SHIMIZU OSAHISA
IPC分类号： G01N27/26 , G01N17/00 , G01N17/02
摘要： PURPOSE:To detect the damage position of a corrosion-proof film with high accuracy, by applying AC voltage with specific frequency between a metal pipe embedded in the ground in a state coated with a corrosion-proof film and an opposed electrode and detecting potential difference of the surface of the earth by two wheel electrodes of a detection apparatus. CONSTITUTION:A metal pipe 2, to which a corrosion-proof film 1 was applied, is embedded in the ground and AC voltage with signal frequency of 1-19Hz is applied between the metal pipe 2 and an opposed electrode 6 by a transmission apparatus 7. Two wheeled electrodes 8 comprising conductive sponge rubber are provided to a detection apparatus 12 and the direction of the wheel electrodes 8 are arranged in the longitudinal direction of the metal pipe 2. The earth's surface potential generated between the wheel electrodes 8 is detected by a display apparatus 11 through a filter 9 and an amplifier 10. Because AC voltage with specific signal frequency is applied and commercial frequency or noise of the other AC or DC component is removed from the detected earth's surface potential to detect a wave from the detected earth's surface potential to detect a wave form pattern, the damage position of the corrosion- proof film can be easily detected.

3. 发明专利

JPS6183951A Damaged position locating method of corrosion preventive cover of buried metallic pipe 失效
标题翻译：破裂金属管的腐蚀防护罩的破坏位置定位方法
公开(公告)号：JPS6183951A
公开(公告)日：1986-04-28
申请号：JP20412884
申请日：1984-10-01
申请人： Nippon Steel Corp
发明人： KAWAKAMI MAKOTO , SHIMIZU OSAHISA
IPC分类号： G01N27/20 , G01N17/02
CPC分类号： G01N17/02
摘要： PURPOSE:To contrive improvement of detection accuracy, by applying a signal voltage of an order of 1-10Hz between a pipe covered with anti-corrosion substance being buried in the ground and an opposedly installed electrode also embedded in the ground, and detecting a position where the minimum value of two maximum values of ground surface electric potential differences is indicated in an indicator. CONSTITUTION:A signal voltage of an order of 1-10Hz is applied between a metallic pipe 2 covered on its surface with anti-corrosion substance and buried in the ground and an electrode positioned opposedly to the pipe and embedded in the ground also, and a detecting apparatus 7 provided with two electrodes 4 arranged with the specified distance apart along the longitudinal direction of the pipe 2, filter 5 and indicator 6 is made to travel along the ground surface just above the pipe 2. Further, a potential difference of the two points on the ground surface just above the pipe 2 is detected continuously and noises of DC- and AC-portions contained in a detecting signal emitted from the filter 5 and noise of the detecting signal are removed and thus, a position of the minimum value between two positions, where the ground surface potential difference shown in the apparatus 6 is indicated as maximum, is detected and accurate location of the damaged position of the pipe 2 is made available.
摘要翻译：目的：为了提高检测精度，通过在覆盖在地下的防腐蚀物质的管道和也嵌入地面的相对安装的电极之间施加1-10Hz的信号电压，并且检测位置其中地面电位差的两个最大值的最小值在指标中指示。构成：在其表面覆盖的金属管2与防腐蚀物质之间施加1〜10Hz的信号电压并埋在地下，以及与管道相对设置并嵌入地面的电极，检测装置7设置有沿着管2的长度方向隔开规定间隔设置的两个电极4，过滤器5和指示器6沿管道2正上方的地面行进。另外，两者的电位差连续地检测出在管2正上方的地面上的点，从滤波器5发出的检测信号中包含的DC和AC部分的噪声和检测信号的噪声被消除，因此，检测装置6中所示的地表面电位差被指示为最大的两个位置，并且使得管道2的损坏位置的精确位置可用。

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