JP2008216091A - Device for detecting corrosion in railroad rail bottom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting corrosion in railroad rail bottom, capable of precisely detecting corrosion, at a spot where visual inspection of a railroad rail bottom cannot be performed. <P>SOLUTION: The device for detecting corrosion in a railroad rail bottom, comprises a testing AC power supply unit 42 that supplies power along a rail 41, a magnetic flux density sensor 44 that consists of a plurality of magnetic flux densitometers arranged along the surface of the rail 41, an actuator 45 for driving this magnetic flux density sensor that moves this magnetic flux density sensor 44 along the rail 41, a controller for the actuator for driving this magnetic flux density sensor and a data acquisition device 47 from the magnetic flux density sensor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rail bottom corrosion detection device for railroads, and more particularly to a rail bottom corrosion detection device capable of detecting corrosion at a location where visual inspection of the rail bottom at a railroad crossing or a vehicle garage is impossible. is there.

  Conventionally, the detection of corrosion of railway rails employs ultrasonic detection and flaw detection methods using eddy currents.

In addition, a sensor having an excitation coil and a search coil is arranged on a conductive flaw detection object, and a spectrogram showing a change in eddy current is obtained by scanning the flaw detection object with the sensor, and the spectrogram is analyzed. A flaw detection method and apparatus based on magnetic measurement for flaw detection of a flaw detection object has been disclosed (see Patent Document 1 below).
JP 2000-131287 A

  However, at present, no rail bottom corrosion detection device has been proposed for accurately detecting corrosion at the rail bottom that cannot be visually inspected due to pavement.

  In view of the above circumstances, an object of the present invention is to provide a railroad bottom corrosion detection device for a railroad that can accurately detect corrosion at a location where the rail bottom of the rail cannot be visually inspected.

In order to achieve the above object, the present invention provides
[1] A rail bottom corrosion detection device for a railway, comprising: a test AC power supply device energized along the rail; and a magnetic flux density sensor comprising a plurality of magnetic flux density meters arranged along the surface of the rail. It is characterized by doing.

  [2] The rail bottom corrosion detection device according to [1], further comprising: a magnetic flux density sensor driving actuator that moves the magnetic flux density sensor along the rail.

  [3] The rail bottom corrosion detection device according to the above [1] or [2], comprising a control device for the actuator for driving the magnetic flux density sensor and a data collection device for the magnetic flux density sensor. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the corrosion of the rail bottom part of the location which cannot test | inspect visually by the rail bottom part of a railway can be detected exactly.

  The rail bottom corrosion detection device of the present invention includes a test AC power supply device that is energized along the rail, a magnetic flux density sensor that includes a plurality of magnetic flux density meters arranged along the surface of the rail, An actuator for driving the magnetic flux density sensor for moving the magnetic flux density sensor along the rail, a control device for the actuator for driving the magnetic flux density sensor, and a data collecting device for the sensor are provided.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a perspective view showing a rail installation state of a railroad crossing section, and FIG.

  In this figure, 1 and 2 are rails, 3, 4 and 5 are pavements installed to pass through the railroad crossings, and the wheels 8 and 9 come into contact with the rail treads 6 and 7.

  FIG. 3 is a schematic view showing a state where a magnetic field is generated on the rail according to the embodiment of the present invention.

  As shown in this figure, when a current I is applied in the direction in which the rail 11 is laid, a magnetic field H is generated according to the right-handed screw law.

  FIG. 4 is a diagram showing the principle of rail bottom corrosion detection according to an embodiment of the present invention. FIG. 4 (a) is a diagram showing the distribution state of the magnetic field H when the rail bottom is normal, and FIG. FIG. 4C is a diagram showing a distribution state of the magnetic field H when there is a corrosion spot on the right side of the rail bottom, and FIG. 4C is a diagram showing a distribution state of the magnetic field H when there is a corrosion spot on the left side of the rail bottom.

  As shown in FIG. 4A, the rail 21 has a bottom portion 22 and a tread surface 23, and a pavement 24 is provided. Thus, when the bottom 22 is in a normal state, when a current I flows through the rail 21 in the direction of the paper, a magnetic field H is generated in the right-handed direction, and the magnetic field H is distributed evenly on the left and right. Indicates the state.

  As shown in FIG. 4B, when the corroded portion 25 is present at the left end portion of the bottom portion 22 of the rail 21, the left magnetic field H ′ and the right magnetic field H are different.

  Similarly, as shown in FIG. 4C, when the corroded portion 26 is present at the right end of the bottom 22 of the rail 21, the left magnetic field H and the right magnetic field H ″ are different.

  FIG. 5 is a schematic diagram showing a rail bottom corrosion detection apparatus for performing rail bottom corrosion detection according to an embodiment of the present invention.

  As shown in this figure, a plurality of magnetic flux density meters (search coils) 31 are arranged along the surface of the rail 21. The plurality of magnetic flux density meters (search coils) 31 constitute a magnetic flux density sensor 32.

  Then, if there is a corroded portion of the bottom portion 22 of the rail 21, the magnetic flux density indicated by the magnetic flux density meter (search coil) 31 becomes larger than when there is no corroded portion, and it is determined that there is a corroded portion.

  In general, when the frequency of the energizing current in a power source such as the test AC power source 42 is increased, the penetration depth of the current is reduced due to the skin effect. Along with this, the current density and the accompanying magnetic flux density increase as the frequency is increased. Therefore, in a steel material having a T-shape such as a rail, a change in magnetic flux density accompanying a change in penetration depth is utilized, and alternating currents having a plurality of frequencies are supplied from the test AC power supply 42. The amount of corrosion is estimated by recording the difference in the response of the magnetic flux density change in the data collection device 47.

  FIG. 6 is a schematic diagram showing a rail bottom corrosion detection device for performing rail bottom corrosion detection along a rail according to an embodiment of the present invention, and FIG. 6 (a) is a schematic diagram showing a power supply device to the rail, FIG.6 (b) is a schematic diagram which shows the rail bottom part corrosion detection state along a rail.

  In this figure, 41 is a rail, 42 is a test AC power supply, 43 is a current passed through the rail 41, 44 is a magnetic flux density comprising a plurality of magnetic flux density meters (search coils) moved along the rail 41. The sensor 45 is an actuator for driving the magnetic flux density sensor, 46 is a guide rod for the actuator 45 for driving the magnetic flux density sensor, and 47 is an actuator controller for driving the magnetic flux density sensor and a data collecting device.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  INDUSTRIAL APPLICABILITY The rail bottom corrosion detection device of the present invention can be used as a tool that reliably detects corrosion in places where rail bottoms such as railroad crossings and garages cannot be visually inspected.

It is a perspective view which shows the laying condition of the rail of a level crossing part. It is sectional drawing which shows the laying condition of the rail of a level crossing part. It is a schematic diagram which shows the generation | occurrence | production state of the magnetic field to the rail which shows the Example of this invention. It is a figure which shows the principle of the rail bottom part corrosion detection which shows the Example of this invention. It is a schematic diagram which shows the rail bottom part corrosion detection apparatus for performing the rail bottom part corrosion detection which shows the Example of this invention. It is a schematic diagram which shows the rail bottom part corrosion detection apparatus for performing the rail bottom part corrosion detection along the rail which shows the Example of this invention.

Explanation of symbols

1, 2, 11, 21, 41 Rail 3, 4, 5, 24 Pavement 6, 7, 23 Rail tread 8, 9 Wheel I, 43 Current H, H ', H "Magnetic field 22 Rail bottom 25, 26 Rail corrosion Part 31 Magnetic flux density meter (search coil)
32, 44 Magnetic flux density sensor comprising a plurality of magnetic flux density meters 42 AC power supply device for testing 45 Actuator for driving magnetic flux density sensor 46 Guide rod of actuator for driving magnetic flux density sensor 47 Actuator control device and data collecting device for driving magnetic flux density sensor

Claims (3)

(A) a test AC power supply device energized along the rail;
(B) A rail bottom corrosion detection device for a railway, comprising: a magnetic flux density sensor comprising a plurality of magnetic flux density meters arranged along the surface of the rail.   The rail bottom corrosion detection apparatus for railroad according to claim 1, further comprising a magnetic flux density sensor driving actuator for moving the magnetic flux density sensor along the rail.   The rail bottom corrosion of a railway according to claim 1 or 2, comprising a control device for the actuator for driving the magnetic flux density sensor and a data collecting device from the magnetic flux density sensor. Detection device.

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