JP2017142961A - Cable with abnormality detection function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable with abnormality detection function capable of detecting an abnormality that is difficult to discover particularly through a visual observation among abnormalities that may result in cares that causes disconnection of a core wire at the end together with a progress status of abnormality in advance before the abnormality actually causes the disconnection.SOLUTION: A cable 100 with abnormality detection function includes a strand 102 obtained by twisting a plurality of core wires 101 and an external cover 103 obtained by covering a resin in the circumference of the strand 102, in which the external cover 103 includes an inner layer 104 obtained by covering the circumference of the strand 102 with a resin and an external layer 105 obtained by covering the circumference of the inner layer 104 with a resin, and in which a belt body 108 for detecting abnormality obtained by spirally winding between the inner layer 104 and the outer layer 105 in the circumference of the inner layer 104 by integrating an optical fiber cable 107 with a flat band-like tape 106 is further included.SELECTED DRAWING: Figure 1

Description

  In the present invention, among the abnormalities that may eventually lead to the disconnection of the core wire, the abnormalities that are difficult for humans to detect through visual observation are considered before the abnormalities actually lead to the disconnection of the core wire. It is related to the cable with an anomaly detection function that can be detected.

  For example, a gantry crane for carrying out cargo handling work in a harbor has a movable part wiring comprising a stranded wire formed by twisting a plurality of core wires and a jacket formed by coating a resin around the stranded wire. Power supply and signal transmission are realized through cables for use.

  This movable part wiring cable has a bending resistance enough to withstand repeated loading and unloading work over a predetermined period, but it still has an arrow and is caused by repeated loading and unloading work over a long period of time. Deterioration cannot be completely avoided, and some abnormality will occur with the passage of time. This abnormality will eventually lead to disconnection of the core wire and will end its life.

  Since most abnormalities do not appear on the exterior of the movable part wiring cable, it is difficult for humans to detect through visual observation. For example, the feed pool is an abnormality that may eventually lead to the buckling breakage of the core wire, but only the core wire is sent out in the longitudinal direction inside the movable part wiring cable each time the cargo handling operation is repeated. It is difficult for humans to detect through visual observation.

  In order to detect this abnormality, for example, it is conceivable to twist a disconnection prediction cable having only a degree of bending resistance that can be disconnected earlier than the core wire together with a plurality of core wires (for example, patents) Reference 1).

JP 2006-318698 A

  However, even if a disconnection prediction cable is used, it is not possible to know the progress of the abnormality, and it is not possible to know how much time is left before the abnormality reaches the core wire, so the disconnection prediction After cable disconnection, it is necessary to replace the cable for moving parts immediately in consideration of safety, suddenly interrupting the cargo handling work, drastically lowering work efficiency and greatly increasing economic loss. Become.

  Therefore, an object of the present invention is to make an abnormality that is difficult for a human to discover through visual observation, particularly among abnormalities that may eventually lead to the disconnection of the core wire. The object is to provide a cable with an abnormality detection function that can be detected in advance along with the progress of the abnormality.

  The present invention comprises a stranded wire formed by twisting a plurality of core wires, and a jacket formed by coating a resin around the stranded wire, and the jacket is a resin around the stranded wire. An inner layer formed by covering the inner layer, and an outer layer formed by coating a resin around the inner layer, and an optical fiber cable is integrated with a flat strip-shaped tape around the inner layer and the inner layer. It is a cable with an abnormality detection function further provided with an abnormality detection band body wound spirally between the outer layer.

  It is desirable to further include a high-tensile mesh body formed by braiding a plurality of stainless steel wires around the abnormality detection band and between the abnormality detection band and the outer layer.

  It is desirable that the abnormality detection band is wound without abutting the optical fiber cable at a winding pitch equal to or less than the twisting pitch of the stranded wire.

  According to the present invention, among abnormalities that may eventually lead to disconnection of the core wire, particularly abnormalities that are difficult for humans to find through visual observation, before the abnormalities actually lead to disconnection of the core wire. In addition, it is possible to provide a cable with an abnormality detection function that can be detected together with the progress of the abnormality in advance.

It is sectional drawing which shows the structure of the cable with an abnormality detection function which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the band for abnormality detection in the cable with an abnormality detection function of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, a cable 100 with an abnormality detection function according to an embodiment of the present invention includes a stranded wire 102 formed by twisting a plurality of core wires 101 and an outer sheath formed by coating a resin around the stranded wire 102. And a cover 103.

  Examples of the core wire 101 include an insulated wire having a copper wire having high conductivity and a jacket formed by coating a resin around the copper wire.

  The twisted wire 102 is formed by twisting a plurality of core wires 101 at a predetermined twist pitch in order to prevent local stress concentration regardless of which direction the wire is bent.

  The outer jacket 103 has an inner layer 104 formed by coating a resin around the stranded wire 102 and an outer layer 105 formed by coating the resin around the inner layer 104. The outer sheath 103 is formed by, for example, subjecting the stranded wire 102 to multiple extrusion coatings of chloroprene rubber in consideration of weather resistance. From the viewpoint of imparting impact resistance to the jacket 103, a reinforcing layer may be provided between the inner layer 104 and the outer layer 105.

  As shown in FIG. 2, the cable 100 with an abnormality detection function is formed by integrating an optical fiber cable 107 with a flat belt-like tape 106 and spirally winding the inner layer 104 and the outer layer 105 around the inner layer 104. An abnormality detection band 108 is further provided.

  The tape 106 is formed, for example, by processing a non-woven fabric made of fibers having low extensibility into a flat belt-like bag body. Therefore, the tape 106 has a bag portion 109 for inserting and holding the optical fiber cable 107.

  The optical fiber cable 107 includes, for example, a single mode optical fiber and a jacket formed by coating a resin around the single mode optical fiber. Examples of the resin coated around the single mode optical fiber include silicone resin, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin, nylon resin, polyimide resin, or a combination thereof.

  It is desirable that the abnormality detection band 108 is uniformly wound around a position that directly or indirectly contacts the buckling deformation of the core wire 101. The reason for this is to detect the buckling deformation of the core wire 101 as soon as possible and to detect the abnormality early. Further, the abnormality detection band 108 needs to have higher bending resistance than the core wire 101 so as not to be disconnected earlier than the core wire 101. Furthermore, when the abnormality detection band 108 is vertically provided, stress is easily concentrated on the abnormality detection band 108 when the cable 100 with the abnormality detection function is bent, and the abnormality detection band 108 is earlier than the core wire 101. Since there is a risk of disconnection, it is necessary to wrap the abnormality detection band 108 around the inner layer 104 in a spiral shape. Note that the abnormality detection band 108 is wound with a winding pitch equal to or less than the twisting pitch of the stranded wire 102 without being abutted against the optical fiber cable 107 (roughly wound). Therefore, it is possible to detect with high accuracy which part of the stranded wire 102 is abnormal. Further, when the optical fiber cable 107 is abutted, it is difficult for the optical fiber cable 107 to be deformed and it is difficult to pick up an abnormality.

  The bag portion 109 may be formed at the end of the tape 106 or may be formed at the center of the tape 106. Further, the bag portion 109 may be formed not only at one place but also at two or more places. When forming the bag part 109 in two or more places, in order to avoid contact between the optical fiber cables 107, it is desirable to form them at intervals. The reason for this is to prevent the optical fiber cables 107 from being disconnected due to contact between the optical fiber cables 107.

  Referring again to FIG. 1, the cable 100 with an abnormality detection function has a high tension formed by braiding a plurality of stainless steel wires around the abnormality detection band 108 and between the abnormality detection band 108 and the outer layer 105. A net body 110 is further provided.

  In the high-tensile mesh body 110, chloroprene rubber is extruded and coated around the inner layer 104, and the vulcanization heat when the outer layer 105 is formed by vulcanizing the chloroprene rubber is directly transmitted to the belt 108 for abnormality detection. It functions as a thermal buffer layer that prevents the Further, the high-tensile mesh body 110 serves as a fixed layer for securely fixing the outer layer 105 around the inner layer 104 by causing the chloroprene rubber to bite into the mesh of the high-tensile mesh body 110 when the chloroprene rubber is extrusion coated around the inner layer 104. Also works. Further, the high-tensile mesh body 110 also functions as the above-described reinforcing layer.

  In the cable 100 with this abnormality detection function, when the position deviation of the core wire 101 occurs due to bending, the undulation accompanying the position deviation causes the tape 106 to be deformed and the stress of the deformation is the tape 106. And transmitted to the optical fiber cable 107. Then, since an optical pulse tester is optically connected to one end of the optical fiber cable 107 and the optical pulse test (Optical Time Domain Reflectometer; OTDR) is performed, the waveform changes. Compare the waveform with the initial waveform. Therefore, it is possible to accurately estimate at which point the abnormality has occurred and the progress of the abnormality. That is, in the cable 100 with the abnormality detection function, the abnormality is easily transmitted to the optical fiber cable 107 through the tape 106 as compared with the case where the optical fiber cable 107 is simply attached. It can be detected. In addition, since the progress of the abnormality can be estimated, the facility conditions are relaxed, and the abnormality detection function cable 100 is sewn in between the work and replaced with a new one. It is possible to avoid disconnection of the core wire 101 in the cable 100 with a detection function.

  As described above, according to the present invention, among the abnormalities that may eventually lead to the disconnection of the core wire 101, the abnormalities that are difficult for humans to find through visual observation are actually detected by the core wire 101. Thus, it is possible to provide the cable 100 with the abnormality detection function that can be detected together with the progress of the abnormality in advance before breaking the cable.

DESCRIPTION OF SYMBOLS 100 Cable with abnormality detection function 101 Core wire 102 Stranded wire 103 Outer jacket 104 Inner layer 105 Outer layer 106 Tape 107 Optical fiber cable 108 Abnormality detection band 109 Bag part 110 High tension net

Claims (3)

A stranded wire formed by twisting a plurality of core wires;
A jacket formed by coating a resin around the stranded wire;
With
The jacket has an inner layer formed by coating a resin around the stranded wire, and an outer layer formed by coating the resin around the inner layer,
An anomaly characterized by further comprising an anomaly detection band formed by integrating an optical fiber cable into a flat strip tape and spirally wound around the inner layer between the inner layer and the outer layer. Cable with detection function. The abnormality detection according to claim 1, further comprising a high-tensile mesh body formed by weaving a plurality of stainless steel wires around the abnormality detection band and between the abnormality detection band and the outer layer. Functional cable. The cable with an abnormality detection function according to claim 1 or 2, wherein the abnormality detection band is wound without abutting the optical fiber cable at a winding pitch equal to or less than a twisting pitch of the stranded wire.

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