WO2015194629A1 - Appareil d'inspection non destructive - Google Patents

Appareil d'inspection non destructive Download PDF

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Publication number
WO2015194629A1
WO2015194629A1 PCT/JP2015/067582 JP2015067582W WO2015194629A1 WO 2015194629 A1 WO2015194629 A1 WO 2015194629A1 JP 2015067582 W JP2015067582 W JP 2015067582W WO 2015194629 A1 WO2015194629 A1 WO 2015194629A1
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WO
WIPO (PCT)
Prior art keywords
unit
inspected
pipe
inspection apparatus
magnetic
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Application number
PCT/JP2015/067582
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English (en)
Japanese (ja)
Inventor
夏野　靖幸
Original Assignee
コニカミノルタ株式会社
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Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Publication of WO2015194629A1 publication Critical patent/WO2015194629A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws

Definitions

  • the present invention relates to a nondestructive inspection apparatus.
  • Nondestructive inspection apparatuses that detect defects such as corrosion, fatigue, and cracks in pipes made of steel materials or multiple pipes in which steel pipes are covered with a heat insulating material or the like are known.
  • a pipe to be inspected is inserted into an excitation coil, a pulse voltage is applied to the excitation coil, a magnetic field generated in the pipe is detected by a magnetic sensor, and a response of the detected magnetic field is analyzed.
  • Non-destructive inspection equipment has been proposed.
  • Patent Document 2 describes an X-ray irradiation apparatus that includes a self-propelled mechanism and irradiates X-rays while self-propelled to inspect the corrosion state of pipes.
  • JP 2014-44087 A Japanese Patent No. 3084157
  • An object of the present invention is to provide a nondestructive inspection apparatus using magnetism that can be inspected while traveling without being affected by magnetic noise.
  • a non-destructive inspection device for non-destructive inspection of defects in piping to be inspected, An excitation coil that applies a magnetic field to the pipe to be inspected by applying a pulse voltage in a state where the pipe to be inspected is inserted; A magnetic sensor for detecting a magnetic field generated by applying a pulse voltage to the excitation coil; A traveling unit that travels the excitation coil and the magnetic sensor in a direction parallel to a central axis of the pipe to be inspected; A driving unit for applying a driving force to the traveling unit; A blocking unit that magnetically blocks the magnetic sensor from magnetic noise generated by the driving unit; It is provided with.
  • FIG. 1 It is a block diagram which shows the basic composition of the nondestructive inspection apparatus of this invention. It is sectional drawing which shows an example of to-be-inspected piping. It is a perspective view which shows schematic structure of the detection part of the nondestructive inspection apparatus of 1st Embodiment. It is sectional drawing in the IV-IV line of FIG. It is a figure for demonstrating the structure of a driving
  • FIG. 1 is a block diagram showing a basic configuration of a nondestructive inspection apparatus 1 in the first embodiment of the present invention.
  • the nondestructive inspection apparatus 1 is an apparatus that detects a defect in the inspection pipe 2 by applying a pulse magnetic field to the inspection pipe 2 to be inspected and detecting a change in the pulse magnetic field flowing through the inspection pipe 2. is there.
  • the nondestructive inspection apparatus 1 is attached to the pipe 2 to be inspected and is self-propelled in the longitudinal direction of the pipe 2 to be inspected, and a pulse magnetic field is applied to the pipe 2 to be inspected.
  • the detector 10 detects a change in the magnetic field transmitted through the pipe 2 to be inspected.
  • FIG. 2 is a cross-sectional view showing an example of the pipe 2 to be inspected.
  • the pipe 2 to be inspected is, for example, a heat insulating pipe, and includes an outer tube 2c such as a steel pipe 2a, a heat insulating material 2b covering the periphery of the steel pipe 2a, and a molten zinc iron plate covering the periphery of the heat insulating material 2b.
  • the nondestructive inspection apparatus 1 of the present invention can be applied to, for example, a pipe 2 to be inspected having a length of several meters to several kilometers, and is in contact with, for example, a heat insulating material 2b as a defect of the pipe 2 to be inspected.
  • a concave thinned portion D formed on the surface of the steel pipe 2a can be measured.
  • FIG. 3 is a perspective view illustrating a schematic configuration of the detection unit 10 of the nondestructive inspection apparatus 1.
  • 4 is a cross-sectional view taken along line IV-IV in FIG. In FIG. 4, illustration of the drive connecting portion 15 is omitted.
  • the longitudinal direction of the pipe 2 to be inspected is the X direction
  • the vertical direction is the Z direction
  • the direction orthogonal to the X direction and the Z direction is the Y direction.
  • a front side and a rear side are attached to the X direction
  • a right side and a left side are attached to the Y direction
  • an upper side and a lower side are attached to the Z direction.
  • the front side is the traveling direction side of the detection unit 10
  • the rear side is the opposite side.
  • the detection unit 10 includes a magnetic shield unit 11, excitation coils 12 and 12, a magnetic sensor 13, a drive motor 14, a drive connection unit 15, a travel unit 16, a center holding unit 17, and a communication unit 18. And a control unit 19.
  • the magnetic shield part 11 is formed in a cylindrical shape having openings at both front and rear ends, and is configured to cover the pipe 2 to be inspected.
  • the magnetic shield unit 11 includes excitation coils 12 and 12, a magnetic sensor 13, and a traveling unit 16 inside, and a driving motor 14 for applying a driving force to the traveling unit 16 on the outside. Since the magnetic seal part 11 holds the exciting coil 12 and the magnetic sensor 13 as described above, a magnetic field is detected along the X direction of the pipe 2 to be inspected by moving the magnetic shield part in the X direction. be able to.
  • the magnetic shield unit 11 is a blocking unit for magnetically blocking the exciting coils 12 and 12 and the magnetic sensor 13 from magnetic noise generated by the drive motor 14.
  • the magnetic shield part 11 is preferably made of a soft magnetic material.
  • soft magnetic materials include iron, silicon steel, permalloy, sendust, permendur, ferrite, amorphous magnetic alloy, and nanocrystal magnetic alloy.
  • the excitation coils 12 and 12 are a pair of coils that are held on the inner surface of the magnetic shield part 11 at a predetermined distance.
  • the exciting coils 12 and 12 are formed in a size that allows the pipe 2 to be inspected to be inserted, and apply a pulse voltage while the pipe 2 to be inspected is inserted to apply a magnetic field to the pipe 2 to be inspected.
  • the magnetic sensor 13 is disposed between the pair of excitation coils 12 and 12 on the inner surface of the magnetic shield unit 11, and is generated when at least one of the excitation coils 12 and 12 is driven. A pulse magnetic field parallel to the (X direction) is detected.
  • the magnetic sensor 13 for example, in addition to a magnetoresistive element (MR element), a magnetism capable of measuring magnetic signals from extremely low frequencies such as a magnetic impedance element, a Hall element, a flux gate, and a superconducting quantum interference element (SQUID).
  • MR element magnetoresistive element
  • a sensor can be used.
  • magnetic noise sources that affect the detection result of the magnetic sensor exist everywhere, such as motors, electric wires, pumps for oil feeding, and even geomagnetism.
  • the drive motor 14, the control unit 19, and the wiring (not shown) for connecting the drive motor 14 and the control unit 19 are all sources of magnetic noise.
  • the sensor 13 and the noise source can be magnetically blocked. This is because, as a physical phenomenon of magnetism, by arranging a magnetic body (magnetic shield part 11) between the noise source and the detection part (excitation coils 12 and 12, magnetic sensor 13 and drive motor 14 in the present invention), This is because the magnetic body functions as a magnetic shield. Further, since the magnetism always connects the S pole and the N pole, the magnetic field is not generated when the physical distance is increased. That is, in the opening portion of the magnetic shield portion 11, the entrance of magnetism can be reduced by lengthening the eave portion.
  • the eave portion of the magnetic shield portion 11 is preferably as long as possible.
  • the distance and position from the front end portion and the rear end portion of the magnetic shield portion 11 are determined so that the value is 0.5 gauss or less, more preferably 0.1 gauss or less. By doing in this way, the influence of the magnetic noise by the drive motor 14 and geomagnetism can be excluded.
  • the driving motor 14 is a driving unit that generates a driving force applied to the traveling unit 16.
  • a servo motor or the like is used as the drive motor 14, and the drive motor 14 is connected to the traveling unit 16 via the drive connection unit 15.
  • the drive motor 14 is controlled by the control unit 19.
  • the drive connecting portion 15 is a transmission mechanism for transmitting the driving force of the drive motor 14 to the traveling portion 16.
  • the drive connecting portion 15 connects, for example, the first shaft 151, the second shaft 152, the first gear box 153 that connects the first shaft 151 and the second shaft 152, and the second shaft 152 and the traveling portion 16.
  • a second gear box 154 is a transmission mechanism for transmitting the driving force of the drive motor 14 to the traveling portion 16.
  • the first shaft 151 is located above the outside of the magnetic shield unit 11, one end is connected to the drive motor 14, the other end is connected to the first gear box 153, and rotates as the drive motor 14 is driven.
  • the first gear box 153 is located outside the front end side of the magnetic shield unit 11 and includes a link mechanism for transmitting the driving force of the first shaft 151 to the second shaft 152.
  • a link mechanism for example, a configuration including a first gear provided at an end portion of the first shaft 151 and a second gear provided at an end portion of the second shaft 152 and meshing with the first gear can be cited.
  • any known configuration may be used as long as it can transmit the driving force.
  • the second shaft 152 has one end connected to the first gear box 153 and the other end connected to the second gear box 154, and rotates by the driving force transmitted through the first gear box 153.
  • the main part of the second shaft 152 other than the end connected to the first gear box 153 is located above the inside of the magnetic shield part 11, that is, above the pipe 2 to be inspected.
  • the second gear box 153 also includes a known link mechanism, and transmits the driving force of the second shaft 152 to the traveling unit 16.
  • the configuration of the drive connecting portion is not limited to the configuration using the shaft as described above.
  • a configuration using a drive belt may be used instead of the configuration using the above-described shafts (the first shaft 151 and the second shaft 152).
  • a known coupling mechanism capable of appropriately transmitting the driving force is provided instead of the first gear box 153 and the second gear box 153.
  • the traveling unit 16 causes the detection unit 10 to travel on the outer periphery of the pipe 2 to be inspected and in front of the pipe 2 to be inspected.
  • 5A and 5B are diagrams for explaining the configuration of the traveling unit 16.
  • FIG. 5A is a diagram of the traveling unit 16 viewed from the upper side
  • FIG. 5B is a diagram of the traveling unit 16 viewed from the left side. .
  • the traveling unit 16 includes a shaft portion 161 whose base end portion is connected to the second gear box 154 and rotates in the arrow direction of FIG. 5B by the driving force transmitted from the second gear box 154. ing.
  • the shaft portion 161 supports an inverted V-shaped frame (support portion) F that is rotatably provided with respect to the magnetic shield portion 11.
  • the frame F has an inverted V shape having a vertex in the center in the X direction, and the vertex is supported by the shaft portion 161.
  • the apex angle of the frame F is a predetermined angle.
  • the frame F may be formed by bending one member or a combination of two members as long as the apex angle can be maintained at a predetermined angle.
  • the frame F holds pulleys 162 and 162 and wheels 163 and 163 coaxial with the pulleys 162 and 162 at the two lower ends (both ends) thereof.
  • Endless belts 164 and 164 are wound around the front end portion of the shaft portion 161 and the pulleys 162 and 162.
  • the frame F is arranged such that its two lower ends are along the X direction, and therefore the wheels 163 and 163 are arranged along the X direction at the center in the Y direction of the pipe 2 to be inspected. It becomes.
  • the wheels 163 and 163 are irregularities on the surface of the pipe 2 to be inspected when traveling on the pipe 2 to be inspected, such as a pneumatic tire in which the air pressure is appropriately adjusted, or a sponge tire in which the hardness is appropriately adjusted. Those capable of buffering the impact due to the above can be used.
  • the rotation of the shaft portion 161 is transmitted to the wheels 163 and 163 via the pulleys 162 and 162 and the endless belts 164 and 164, and the wheels 163 and 163 rotate in the direction of the arrow in FIG.
  • the part 10 will run forward.
  • the wheels 163 and 163 move up and down by rotating the frame F around the shaft portion 161 with respect to the unevenness of the surface of the pipe 2 to be inspected, and the wheels 163 and 163 are in the pipe to be inspected. 2 It can be made to run following the unevenness of the surface.
  • the center holding portion 17 includes, for example, contact members 171 and 171 and spring members 172 and 172 that support the contact members 171 and 171.
  • the abutting members 171 and 171 are provided on the inner surface of the magnetic shield part 11 so as to form a left-right pair.
  • the abutting members 171 and 171 press the pipe to be inspected 2 from both the left and right sides when the pipe to be inspected 2 is inserted into the magnetic shield part 11 (excitation coils 12 and 12).
  • the left and right center portions can be aligned with the left and right center portions of the detection unit 10 (excitation coils 12 and 12).
  • the center holding portion 17 abuts at two opposing points on the outer peripheral surface of the pipe 2 to be inspected, and restricting means for restricting the position of the pipe 2 to be inspected with respect to the magnetic shield portion 11 and the position with respect to the exciting coils 12 and 12.
  • the contact members 171 and 171 for example, a material that is slippery with respect to the pipe 2 to be inspected, such as nylon, is used. Friction is prevented from occurring.
  • the center holding portion 17 is a pneumatic tire in which the air pressure is appropriately adjusted, and the hardness is appropriately adjusted. It is also possible to use a guide roller made of a sponge tire or the like.
  • the center holding part 17 may be configured to abut on three or more points instead of two points on the outer peripheral surface of the pipe 2 to be inspected.
  • the communication unit 18 performs wireless communication with the station 40.
  • the measurement data may be transferred to a data center arranged at a location different from the measurement device using the data obtained by the communication unit 18.
  • the control unit 19 includes a control circuit that controls each unit of the detection unit 10, a battery, and the like, and is housed in a housing 19 a provided at the lower part of the magnetic shield unit 11.
  • the control unit 19 includes, for example, a magnetic sensor circuit for driving the magnetic sensor 13, a motor circuit for driving the drive motor 14, a pulse power source for applying a voltage to the excitation coils 12 and 12, and a pulse power source.
  • An electrically connected power supply switching circuit, a signal processing circuit that receives and processes a signal input from the station 40, a battery charging circuit, and the like are provided.
  • the magnetic sensor circuit is a circuit for driving the magnetic sensor 13 and measuring a magnetic field.
  • the motor circuit is a circuit for driving the drive motor 14 and operating the traveling unit 16.
  • the pulse power source can apply a pulse voltage to at least one of the exciting coils 12 and 12. Note that the pulse power source can output a square wave and can be driven at a predetermined repetition rate and a duty ratio.
  • the power source switching circuit can switch the current direction of one exciting coil and the other exciting coil of the exciting coils 12 and 12 to the same direction or the opposite direction, or can be switched so that only one of the exciting coils 12 and 12 is driven. Circuit. With the power supply switching circuit, it is possible to select the direction of the current flowing in the exciting coils 12 and 12 and operating both or only one of them.
  • the signal processing circuit processes a signal received from the station 40 via the communication unit 18 and outputs the processed signal to a magnetic sensor circuit, a motor circuit, a power supply switching circuit, and the like.
  • the battery charging circuit charges the battery.
  • each part of the detection part 10 becomes measurable, running independently, without connecting with an external power supply, by supplying electric power from a battery.
  • the station 40 includes a main control unit 41, a signal analysis unit 42, an operation input unit 43, a display unit 44, a communication unit 45, and the like.
  • the main control unit 41 is a control circuit that controls each unit of the station 40. Based on the signal input from the operation input unit 43, the main control unit 41 transmits various signals instructing the detection unit 10 to start travel, stop travel, start measurement, stop measurement, and the like, for example. . Further, the main control unit 41 outputs the detection signal of the magnetic sensor 13 received from the detection unit 10 to the signal analysis unit 42.
  • the signal analysis unit 42 analyzes the response of the pulse magnetic field parallel to the central axis direction (X direction) of the pipe 2 to be inspected detected by the magnetic sensor 13. For example, when comparing the pulse intensity and the signal time attenuation in the detection signals measured in the inspected pipe 2 having a defect and the inspected pipe 2 having no defect, there is a defect compared to the inspected pipe 2 having no defect. In the pipe 2 to be inspected, the signal is attenuated quickly because the thickness of the defect structure is thin. The signal analysis unit 42 identifies the presence / absence of a defect based on the change in the pulse response characteristic.
  • the operation input unit 43 includes, for example, a push button switch, a keyboard, a mouse, or a trackball, and converts an operator's input operation into an operation signal and inputs the operation signal to the main control unit 41.
  • the display unit 44 includes a display screen using, for example, an LCD (Liquid Crystal Display) or the like, and a pulse magnetic field waveform detected by the magnetic sensor 13 on the display screen in accordance with a control signal output from the main control unit 41. Etc. Inspection data is displayed.
  • LCD Liquid Crystal Display
  • the communication unit 45 performs wireless communication with the detection unit 10.
  • the detection unit 10 is attached to the inspection pipe 2. Specifically, the pipe to be inspected 2 is inserted into the magnetic shield part 11 (excitation coils 12 and 12) so that the traveling part 16 of the detection unit 10 is arranged on the pipe to be inspected 2. At this time, the center holding portion 17 brings the left and right centers of the magnetic shield portion 11 and the left and right centers of the pipe 2 to be inspected into alignment.
  • the detection part 10 is equipped with the control part 19 below the magnetic shield part 11, and a gravity center is the structure located in the lower part of the said detection part 10, when inserting the detection part 10 into the to-be-tested pipe 2, The wheels 163 and 163 are pressed against the pipe 2 to be inspected.
  • the detection motor 10 is driven by driving the drive motor 14 to operate the travel unit 16.
  • the excitation coils 12, 12 are driven at predetermined timings to generate a pulse magnetic field on the pipe 2 to be inspected. Apply.
  • a magnetic field parallel to the X direction generated by the exciting coils 12 and 12 is detected by the magnetic sensor 13 and is sequentially transmitted to the station 40.
  • the defect of the inspected pipe 2 is specified by analyzing the pulse intensity (signal intensity) and the signal time attenuation in the detection signal.
  • the excitation coils 12 and 12 for applying a magnetic field to the pipe 2 to be inspected the magnetic sensor 13 for detecting the magnetic field generated by applying a pulse voltage to the excitation coils 12 and 12, the excitation coils 12 and 12 and A traveling unit 16 that travels the magnetic sensor 13 in the X direction, a drive motor 14 that applies a driving force to the traveling unit 16, and a magnetic shield unit 11 that magnetically shields the magnetic sensor 13 from magnetic noise generated by the drive motor 14. It is equipped with.
  • the running part 16 can continuously measure the thickness reduction state without the operator's presence on the pipe 2 to be inspected laid for a long distance, for example.
  • the detection unit 10 includes the magnetic shield unit 11, an accurate inspection can be performed without being affected by the magnetic noise of the drive motor 14 for operating the traveling unit 16. That is, the nondestructive inspection apparatus 1 can perform an inspection while traveling without being affected by magnetic noise.
  • the magnetic shield unit 11 magnetically shields the excitation coils 12 and 12 from magnetic noise generated by the drive motor 14. For this reason, since not only the magnetic sensor 13 but also the exciting coils 12 and 12 can be protected from magnetic noise by the magnetic shield portion 11, more accurate inspection can be performed.
  • the magnetic shield part 11 is formed in a cylindrical shape with both ends opened, the magnetic sensor 13 is disposed inside the magnetic shield part 11, and the drive motor 14 is provided with the magnetic shield part 11.
  • the distance from the opening end of the magnetic shield part 11 to the magnetic sensor 13 so that the value of the magnetic sensor 13 is 0.1 gauss or less when the drive motor 14 is driven during non-inspection.
  • the position is fixed. For this reason, the influence of the magnetic noise due to the drive motor 14 and the geomagnetism can be surely eliminated, and a more accurate inspection can be performed.
  • the traveling unit 16 includes the drive coupling unit 15 that is disposed inside the magnetic shield unit 11 and transmits a driving force from the drive motor 14 to the traveling unit 16.
  • the drive motor 14 and the traveling unit 16 are connected from at least one of the open ends of the magnetic shield unit 11 using a shaft or a belt. For this reason, the driving force of the drive motor 14 provided outside the magnetic shield part 11 can be transmitted to the traveling part 16 provided inside the magnetic shield part 11 by a relatively simple mechanism.
  • the exciting coils 12 and 12 and the magnetic sensor 13 are held by the magnetic shield unit 11. For this reason, the apparatus structure of the detection part 10 can be simplified.
  • the traveling unit 16 is held by the magnetic shield unit 11. For this reason, the apparatus structure of the detection part 10 can be simplified.
  • the traveling unit 16 includes an inverted V-shaped frame F that is rotatably provided with respect to the magnetic shield unit 11 and a pair of wheels 163 that are provided at the lower end of the frame F. , 163, and the pair of wheels 163, 163 rotate by the driving force from the driving motor 14. For this reason, the wheels 163 and 163 can be caused to travel following the unevenness of the surface of the pipe 2 to be inspected.
  • maintenance part 17 which contact
  • the nondestructive inspection apparatus (not shown) of the present embodiment includes a detection unit 20 instead of the detection unit 10 of the first embodiment.
  • FIG. 6 is a perspective view illustrating a schematic configuration of the detection unit 20.
  • FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.
  • the detection unit 20 includes a magnetic shield unit 11, excitation coils 12 and 12, a magnetic sensor 13, a drive motor 14, a drive connection unit 25, a travel unit 26, a communication unit 18, and a control unit 19. It has.
  • the drive connecting portion 25 includes a first shaft 251, a second shaft 252, a first gear box 253, and three second gear boxes 254, 254, and 254.
  • the first shaft 251, the second shaft 252, and the first gear box 253 have the same configuration as the first shaft 151, the second shaft 152, and the first gear box 153 of the first embodiment.
  • the second gear box 254 may use any known mechanism as long as it can transmit the driving force of the second shaft 252 to the traveling unit 26.
  • the traveling unit 26 includes a pair of wheels 262 and 262 provided on shafts (support portions) 261 and 261 provided in a left-right pair and in an inverted V shape, and lower ends (both ends) of the shafts 261 and 261.
  • a pair of wheels 262 and 262 are arranged along the Y direction.
  • Each shaft portion 261 has an upper end connected to the second gear box 254, holds the wheel 262 rotatably at the lower end, and rotates the wheel 262 by driving force transmitted from the second gear box 254. Rotate in the direction of 6 arrow.
  • the traveling portion 26 is provided with the inverted V-shaped shaft portions 261 and 261 and the pair of shaft portions 261 and 261 that are disposed along the Y direction.
  • a plurality of units U having wheels 262 and 262 are provided, and the pair of wheels 262 and 262 of the unit U are rotated by the driving force from the driving motor 14. For this reason, not only the effect similar to 1st Embodiment is acquired, but more stable driving
  • the number of units U (the number of wheels 262) is not limited to this. Of course. That is, a configuration including two or four or more units U may be employed.
  • a plurality (two in this case) of drive motors 14 and 14 are provided, and the drive connecting portion is connected from both front and rear end portions of the magnetic shield portion 11.
  • the drive motors 14 and 14 and the traveling unit 26 may be connected via the 25 and 25.
  • the configuration in which all the six wheels 262 are connected to the second shaft 152 and illustrated is described as an example.
  • only the two wheels 262 on the front side in the traveling direction are connected to the second shaft 152. It may be a configuration. That is, only the two wheels 262 on the front side in the traveling direction may be driven, and the remaining four wheels 262 may be driven.
  • the structure provided with the endless track (what is called a caterpillar) 263 which connects the wheel 262 may be sufficient.
  • the wheels 262 pass through the endless track 263, so that more stable travel is possible.
  • all the wheels 262 may be driven, but since the wheels 262 are connected by the endless track 263, it is also preferable to drive only the two wheels 262 on the front side in the traveling direction.
  • the nondestructive inspection apparatus (not shown) of the present embodiment includes a detection unit 30 instead of the detection unit 10 of the first embodiment.
  • FIG. 10 is a perspective view illustrating a schematic configuration of the detection unit 30.
  • the detection unit 30 includes a magnetic shield unit 31, excitation coils 12 and 12, a magnetic sensor 13, a drive motor 14, a travel unit 16, a center holding unit 17, a communication unit 18, and a control unit 19. ing. That is, the detection unit 30 includes a magnetic shield unit 31 instead of the magnetic shield unit 11.
  • the magnetic shield part 31 is formed in a box shape and accommodates the drive motor 14 in its internal space.
  • the magnetic shield part 31 can be formed using, for example, a ferromagnetic material such as iron, an alloy such as silicon steel, a ceramic, or the like. By covering the drive motor 14 with the magnetic shield part 31 in this manner, magnetic noise generated when the drive motor 14 is driven can be blocked.
  • the exciting coils 12, 12 are connected and held by a plurality of support members 12a extending in the X direction.
  • the traveling unit 16 is held by the support member 12 a located above the pipe 2 to be inspected.
  • traveling part 26 provided with the some wheel demonstrated in 2nd Embodiment instead of the traveling part 16 may be used.
  • the configuration in which the detection unit 10 and the station 40 are wirelessly connected has been described as an example. However, a configuration in which a wired connection may be used.
  • the nondestructive inspection apparatus of the present invention is useful for flaw detection such as corrosion, fatigue, and cracks in pipes made of steel materials or multiple pipes in which steel pipes are covered with a heat insulating material or the like.
  • Nondestructive inspection device 10 20, 30 Detection unit 11, 31 Magnetic shield unit (blocking unit) 12, 12 Excitation coil 12a Support member 13 Magnetic sensor 14 Drive motor (drive unit) 15, 25 Drive connecting part (transmission mechanism) 151,251 1st shaft 152,252 2nd shaft 153,253 1st gear box 154,254 2nd gear box 16 Traveling part 161 Shaft part 162,162 Pulley 163,163 Wheel 164,164 Endless belt F Frame (support part) ) 26 Traveling unit U unit 261 Shaft part (supporting part) 262 Wheel 263 Endless track 17 Center holding part (regulating means) 171, 171 Contact member 172, 172 Spring member 18 Communication unit 19 Control unit 19a Housing 40 Station 41 Main control unit 42 Signal analysis unit 43 Operation input unit 44 Display unit 45 Communication unit 2 Pipe to be inspected 2a Steel pipe 2b Heat insulating material 2c Outer cylinder D Thinning part

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Abstract

L'invention concerne un appareil d'inspection non destructive permettant l'inspection non destructive de défauts sur un tuyau à inspecter (2). Cet appareil comprend : des bobines d'excitation (12, 12) sur lesquelles est appliquée une tension d'impulsion dans un état dans lequel le tuyau à inspecter (2) traverse l'appareil, ce qui applique un champ magnétique sur le tuyau à inspecter (2); un capteur magnétique (13) servant à détecter le champ magnétique généré par l'application de la tension d'impulsion sur les bobines d'excitation (12, 12); une unité de déplacement (16) destinée à entraîner le déplacement des bobines d'excitation (12, 12) et du capteur magnétique (13) dans un sens X; un moteur d'entraînement (14) servant à appliquer une force d'entraînement sur l'unité de déplacement (16); ainsi qu'une partie blindage magnétique (11) servant à blinder magnétiquement le capteur magnétique (13) contre le bruit magnétique émis par le moteur d'entraînement (14). En conséquence, l'appareil d'inspection non destructive permet de réaliser une autopropulsion et une inspection sans subir l'influence du bruit magnétique.
PCT/JP2015/067582 2014-06-19 2015-06-18 Appareil d'inspection non destructive WO2015194629A1 (fr)

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JP2014-125976 2014-06-19
JP2014125976A JP2017133835A (ja) 2014-06-19 2014-06-19 非破壊検査装置

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Cited By (1)

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CN109668956A (zh) * 2019-01-22 2019-04-23 中国海洋石油集团有限公司 隔水管焊缝缺陷交流电磁场阵列检测探头

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US10712314B2 (en) * 2017-09-12 2020-07-14 Tenaris Connections B.V. Pipe inspection
JP7271058B2 (ja) * 2018-12-28 2023-05-11 富士電機株式会社 Ｘ線検査装置
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