Magnetic flux detection device and method for the fixing section of a magnetic rope equipped with an inter-pole magnetizer and a magnetic socket at its end.

Abstract

To enable estimation or measurement of corrosion in a rope fixing part without making the rope fixing part exposed to the outside.SOLUTION: A magnetic flux detection device comprises: a magnetizer for generating magnetic force; and a magnetic flux sensor for detecting magnetic flux passing through a magnetic rope which is magnetized by the magnetic force generated by the magnetizer. The magnetizer comprises: an exciting coil; a yoke shaft inserted to a center hole of the exciting coil; a pair of yokes connected to both ends of the yoke shaft; and a pair of first and second tip magnetic poles connected respectively to tip portions of the pair of yokes. A magnetic circuit including the yoke shaft, the pair of yokes, the pair of tip magnetic poles, the magnetic rope positioned between the pair of tip magnetic poles, and a magnetic socket is formed by making current flow in the exciting coil. The first tip magnetic pole comprises a recess with a shape along an outer shape of the magnetic rope, whereas the second tip magnetic pole comprises a recess with a shape along an outer shape of the magnetic socket fixed to an end of the magnetic rope.SELECTED DRAWING: Figure 3

Claims

1. The device comprises an excitation coil, a yoke shaft inserted through the central hole of the excitation coil, a pair of yokes connected to both ends of the yoke shaft, and a first and second pair of tip magnetic poles connected to the ends of the pair of yokes, The first tip magnetic pole has a recess shaped to conform to the outer shape of the magnetic rope. The second tip magnetic pole has a recess that conforms to the outer shape of the magnetic socket fixed to the end of the magnetic rope. Interpolar magnetizer.

2. Each of the first and second tip magnetic poles is detachably attached to each of the pair of yokes. The interpole magnetizer according to claim 1.

3. A device for detecting the magnetic flux at the fixing portion of a magnetic rope, in which a magnetic socket is fixed to the end, A magnetizer that generates magnetic force, and It is equipped with a first magnetic flux sensor that detects the magnetic flux passing through a magnetic rope that is magnetized by the magnetic force generated by the magnetizer, The magnetizer comprises an excitation coil, a yoke shaft inserted through the central hole of the excitation coil, a pair of yokes connected to both ends of the yoke shaft, and a first and second pair of tip magnetic poles connected to the ends of the pair of yokes, respectively, and by passing an electric current through the excitation coil, a magnetic circuit is formed including the yoke shaft, the pair of yokes, the pair of tip magnetic poles, a magnetic rope located between the pair of tip magnetic poles, and a magnetic socket. The first tip magnetic pole has a recess shaped to conform to the outer shape of the magnetic rope. The second tip magnetic pole has a recess that conforms to the outer shape of the magnetic socket fixed to the end of the magnetic rope. A magnetic flux detection device for the anchoring section of a magnetic rope.

4. Each of the first and second tip magnetic poles is detachably attached to each of the pair of yokes. A magnetic flux detection device for the fixing portion of a magnetic rope according to claim 3.

5. The device includes a second magnetic flux sensor for detecting the magnetic flux passing through the first tip magnetic pole, and a third magnetic flux sensor for detecting the magnetic flux passing through the second tip magnetic pole. A magnetic flux detection device for the fixing portion of a magnetic rope according to claim 3.

6. The first magnetic flux sensor is a search coil wrapped around the magnetic rope located between the first tip magnetic pole and the second tip magnetic pole. A magnetic flux detection device for the fixing portion of a magnetic rope according to claim 3.

7. The second magnetic flux sensor is a search coil wound around a yoke to which the first tip magnetic pole is connected, and the third magnetic flux sensor is a search coil wound around a yoke to which the second tip magnetic pole is connected. A magnetic flux detection device for the fixing portion of a magnetic rope according to claim 5.

8. The device includes a magnetic field sensor provided on a magnetic rope located between the first and second tip magnetic poles described above. A magnetic flux detection device for the fixing portion of a magnetic rope according to claim 3.

9. A magnetizer is prepared, comprising an excitation coil, a yoke shaft inserted through the central hole of the excitation coil, a pair of yokes connected to both ends of the yoke shaft, and a first and second pair of tip magnetic poles connected to the ends of the pair of yokes, A magnetic rope is placed in the recess of the first tip magnetic pole, and a magnetic socket fixed to the end of the magnetic rope is placed in the recess of the second tip magnetic pole. By passing an electric current through the excitation coil of the magnetizer, the magnetic rope and the magnetic socket are magnetized so that the strength of the magnetic field between the first and second tip magnetic poles becomes a predetermined value. The degree of contact between the first tip magnetic pole and the magnetic rope is adjusted so that the magnetic flux passing through the first tip magnetic pole falls within a predetermined range, and the degree of contact between the second tip magnetic pole and the magnetic socket is adjusted so that the magnetic flux passing through the second tip magnetic pole falls within a predetermined range. A magnetic flux sensor is attached to the magnetic rope located between the first tip magnetic pole and the second tip magnetic pole. By adjusting the current flowing through the excitation coil of the magnetizer, a magnetization curve for the magnetic circuit including the magnetic rope and the magnetic socket is obtained based on the output signal from the magnetic flux sensor. A method for obtaining the magnetization curve of the anchoring section of a magnetic rope.

10. After adjusting the degree of contact between the first tip magnetic pole and the magnetic rope, and after adjusting the degree of contact between the second tip magnetic pole and the magnetic socket, the magnetic rope and the magnetic socket are demagnetized. A method for obtaining the magnetization curve of the anchoring portion of a magnetic rope according to claim 9.

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