KR102417831B1 - Defect detecting apparatus and system - Google Patents

Abstract

The present invention discloses a defect detection apparatus. In detail, the present invention provides a body seated on an object to be inspected, an electromagnetic induction part disposed on the body and generating an induced current, one surface of which is disposed to face the electromagnetic induction part, and based on a change in the induced current, the Disclosed is a defect detection apparatus comprising a sensor for detecting a defect in an inspection object.

Description

Defect detecting apparatus and system

The present invention relates to a device. More particularly, the present invention relates to a joint detection device and a defect detection system including the same.

A carbody and bogie, which are equipped with devices for driving, decelerating, and braking of railroad vehicles, are one of the most essential devices for safe driving of railroad vehicles. However, the structure and shape of the railroad car and the bogie are complicated, and fatigue cracks may occur due to fatigue damage in the connection between the bogie frame, the driving device, and the braking device. Defects in these areas are detected using magnetic particle inspection (MT), but dust is generated by grinding in the preprocessing process, grinding work time is required, and in the case of local parts, the access of the sensor is difficult. Difficulty Defects There is a problem that the team image is difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a defect detection apparatus and system capable of detecting a defect of an inspection object in a non-contact manner.

A defect detection apparatus according to an embodiment of the present invention includes a body seated on an object to be inspected, an electromagnetic induction part disposed on the body and generating an induced current, and one surface disposed to face the electromagnetic induction part, and the induced current It may include a sensor for detecting a defect of the object to be inspected based on a change in .

In one embodiment of the present invention, the body may be provided with a groove portion that is opened toward the object to be inspected, the sensor is disposed therein.

In an embodiment of the present invention, when the body is seated on the object, the sensor may be spaced apart from the object by a preset distance.

In an embodiment of the present invention, the preset distance may be 0.5 mm to 1 mm.

In an embodiment of the present invention, the sensor may include an electromagnetic pickup sensor.

In an embodiment of the present invention, the end of the body seated on the object may have a shape corresponding to the external shape of the object.

In one embodiment of the present invention, when the body is seated on the object to be examined, it may further include a fixing unit for fixing the body to the object.

A defect detection system according to an embodiment of the present invention includes a defect detection apparatus seated on an object to detect a defect in the object, and a defect state of the object to be inspected based on a result detected by the defect detection apparatus and a data analysis device for determining the defect, wherein the defect detection device includes a body seated on the object to be inspected, an electromagnetic induction part disposed on the body and generating an induced current, and one surface is disposed to face the electromagnetic induction part, It may include a sensor for detecting the defect of the object to be inspected based on the change in the induced current.

In one embodiment of the present invention, the body may be provided with a groove portion that is opened toward the object to be inspected, the sensor is disposed therein.

In an embodiment of the present invention, when the body is seated on the object, the sensor may be spaced apart from the object by a preset distance.

In an embodiment of the present invention, the preset distance may be 0.5 mm to 1 mm.

In one embodiment of the present invention, the sensor may include an electromagnetic pickup sensor.

In an embodiment of the present invention, the end of the body seated on the object may have a shape corresponding to the external shape of the object.

In one embodiment of the present invention, when the body is seated on the object to be examined, it may further include a fixing unit for fixing the body to the object.

Defect detection apparatus and system according to embodiments of the present invention detect defects of an inspection object in a non-contact manner by measuring an amount of change in induced current, thereby detecting a defect occurring in a local part of an inspection object, such as a railroad vehicle, and, accordingly, a railway vehicle By detecting defects and damage occurring in the local part of

1 is a perspective view illustrating a defect detection apparatus according to an embodiment of the present invention.
FIG. 2 is a bottom view illustrating the defect detection apparatus of FIG. 1 .
FIG. 3 is a cross-sectional view illustrating the defect detection apparatus of FIG. 1 .
FIG. 4 is a cross-sectional view schematically illustrating a state of detecting a defect in an object to be inspected by using the defect detecting apparatus of FIG. 1 .
5 is a graph showing that a change in current occurs in a defective portion of an object to be inspected.
6 illustrates a defect detection system according to an embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, in each drawing, components are exaggerated, omitted, or schematically illustrated for convenience and clarity of description, and the size of each component does not fully reflect the actual size.

In the description of each component, in the case of being described as being formed on or under, both on and under are formed directly or through other components. Including, the standards for the upper (on) and the lower (under) will be described with reference to the drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. do.

1 is a perspective view illustrating a defect detection apparatus according to an embodiment of the present invention. FIG. 2 is a bottom view illustrating the defect detection apparatus of FIG. 1 . FIG. 3 is a cross-sectional view illustrating the defect detection apparatus of FIG. 1 .

1 to 3 , the defect detection apparatus 20 may detect a defect in an inspection object, and the inspection object is, for example, a bogie frame 10 of a railway vehicle, a bogie frame 10 and a braking device. It may be a connection part of and a connection part between the bogie frame 10 and the driving device. More specifically, the inspection object may be a welding part connecting the bogie frame 10 and the braking device or a welding part connecting the bogie frame 10 and the driving device. In this case, the defect detection apparatus 20 may include a body 100 , an electromagnetic induction unit 200 , and a sensor unit 300 . In addition, the defect detection apparatus 20 may further include a fixing unit (not shown), a signal amplifier (not shown), and a noise filter (not shown).

The body 100 may be seated on the test object in order to detect a defect in the test object. At this time, the body 100 may have various shapes, such as a sphere, a cylinder, a cuboid, etc., but for convenience of description, hereinafter, the body 100 will be described mainly in an embodiment in which the cuboid shape is a cuboid shape.

The body 100 may include a groove 110 . At this time, the groove 110 is disposed at an end (hereinafter, a seating end) of the body 100 facing the body 100 when the body 100 is seated on the object to be examined, so that it can be opened toward the object.

A sensor 310 to be described later may be disposed inside the groove 110 . In this case, the sensor 310 disposed inside the groove 110 may be disposed inside the groove 110 so as to be buried by the first distance R1 from the seating end of the body 100 . In this case, the first distance R1 may be the shortest distance from the outer surface facing the object to be inspected among the outer surfaces of the sensor 310 to the seating end of the body 100 . As such, although the sensor 310 is disposed in the groove 110 so that the body 100 is seated in contact with the object, the sensor 310 may be spaced apart from the surface of the object. Accordingly, the defect detecting apparatus 20 can always detect the defect of the inspection object in a non-contact manner.

At least a portion of the body 100 may be formed to correspond to the external shape of the object to be examined. Specifically, the seating end of the body 100 may have a shape corresponding to the external shape of the object to be examined on which the body 100 is mounted. As an example, when an inspection object for measuring a defect by using the defect detection apparatus 20 has a cylindrical shape, the seating end may be manufactured to have a concave shape to correspond to the cylindrical shape of the inspection object. In addition, the shape of the seating end of the body 100 may be changed according to the external shape of each part of the object to be inspected.

As such, since the seating end of the body 100 has a shape corresponding to the external shape of the object to be inspected, the defect detection apparatus 20 may be seated in close contact with the object to be inspected. Accordingly, it is possible to precisely detect a damaged portion such as a crack generated on the surface or the outside of the object to be inspected. In addition, while the defect of the test object is detected, the body 100 may be stably seated on the test object, thereby improving the stability of the test.

The body 100 may be formed as an insulator. In this case, the body 100 surrounds the current applying unit 220 disposed inside the body 100 and the induced current generating unit 210 , so that the induced current and the induced magnetic field are generated inside the body 100 . It can be concentrated and formed. In addition, the body 100 may prevent the induced current and the induced magnetic field from being affected by external factors. Thereby, the accuracy of defect detection can be improved.

The electromagnetic induction unit 200 may generate an induced current, and in this case, the electromagnetic induction unit 200 may include an induced current generating unit 210 and a current applying unit 220 . As a current is applied to the current applying unit 220 to generate a change in a magnetic field, an induced current may be generated in the induced current generating unit 210 . In this case, the induced current generator 210 may have a film type in the induced current generation unit 210 , and in this case, the film type induced current generation unit 210 may have, for example, aluminum (Al) or copper (Cu). ), such as, may include a conductive material.

The current applying unit 220 may receive a current from the outside of the defect detection device 20 , and the supplied current may flow along the current applying unit 220 . In this case, the current applying unit 220 may include a first applying unit 220a and a second applying unit 220b.

The first applying unit 220a may extend through the inside of the body 100 . In this case, at least a portion of the first applying unit 220a may be disposed adjacent to the sensor 310 and the induced current generating unit 210 , and in this case, a portion of the first applying unit 220a is a film-type induced current It may be arranged in parallel with the generator 210 . Specifically, the 1-1 length portion of the first applying unit 220a extends from the outside to the inside of the body 100 along the -Z axis direction, and the 1-2 length portion extends from the 1-1 length portion to the Y axis. direction, and the 1-3 first length portion may extend out of the body 100 along the Z-axis direction from the 1-2 length portion. In this case, the 1-2 length portion parallel to the sensor 310 and/or the induced current generating unit 210, but may be spaced apart.

The second applying part 220b may extend through the inside of the body 100 and may be disposed to be symmetrical with the first applying part 220a. On the other hand, the 2-1 length portion of the second applying unit 220b extends from the outside to the inside of the body 100 along the -Z axis direction, and the 2-2 length portion extends from the 2-1 length portion to the Y axis direction. , and the 2-3 th length portion may extend to the outside of the body 100 along the Z-axis direction from the 1-2 th length portion. In this case, the length 2-2 is parallel to the sensor 310 and/or the induced current generator 210, but may be spaced apart.

The first applying unit 220a and the second applying unit 220b may be spaced apart from each other. Specifically, the first applicator 220a and the second applicator 220b may be spaced apart from each other along the X-axis direction. In this case, the first applicator 220a and the second applicator 220b are spaced apart from each other. An induced current generator 210 may be disposed therebetween.

When current flows through the first applying unit 220a and the second applying unit 220b, an induced magnetic field may be generated in the region A (hereinafter, region A) of FIG. 2 . In this case, the direction of the current flowing through the first applying unit 220a may be opposite to the direction of the current flowing through the second applying unit 220b. In this case, when viewed in the XY plane, the induced current may be generated in the induced current generator 210 disposed in the region overlapping the region A. In this case, the intensity of the generated induced current may be measured by a sensor 310 to be described later.

The sensor unit 300 may detect a defect in the object to be inspected based on the change in the induced current. In this case, the sensor unit 300 may include a sensor 310 and a transmission unit 32 . In this case, the sensor 310 may be various types of sensors capable of detecting a change in the induced current. For example, the sensor 310 may be a pickup sensor.

The sensor 310 may detect a change in the induced current generated by the induced current generator 210 . Specifically, the sensor 310 may measure the intensity of the induced current in each part of the test object, and generate a pickup signal based on the measured value. In this case, the transmitter 320 may transmit the pickup signal generated by the sensor 310 to the data analysis device 30 to be described later.

On the other hand, in the drawing, an embodiment in which the transmission unit 320 is directly connected to the data analysis apparatus 30 through a connection line and transmits information to the data analysis apparatus 30 using a wired method for transmitting a signal is shown. The invention is not limited thereto, and as another embodiment, the transmitter 320 may transmit a signal to the data analysis apparatus 30 using a wireless transmission method.

A fixing unit (not shown) may fix the body 100 to the examination object when the body 100 is seated on the examination object. In one embodiment, the fixing part may be a clamp (clamp). In this case, by clamping a portion of the object to be inspected by the fixing unit, the defect detection apparatus 20 may be fixed to the object to be inspected while detecting the defect, and after the detection is completed, the clamping state of the fixing unit is released to release the defect. The detection device 20 may be removed or its location may be changed.

Since the body 100 is fixed to the object to be inspected by the fixing unit as described above, it is possible to prevent the defect detection apparatus 20 from being shaken or separated while detecting a defect in the object to be inspected. Thereby, the stability and accuracy of the defect detection process can be improved.

A signal amplifier (not shown) may amplify a signal related to the induced current measured by the sensor 310 to a certain size, and a noise filter (not shown) may remove noise mixed in the signal amplified by the signal amplifier. can In other words, the induced current signal measured by the pickup sensor 310 may be transmitted to the data analysis device 30 through a signal amplifier and a noise filter.

FIG. 4 is a cross-sectional view schematically illustrating a state of detecting a defect in an object to be inspected by using the defect detecting apparatus of FIG. 1 . 5 is a graph showing that a change in current occurs in a defective portion of an object to be inspected.

4 and 5 , when the defect detection apparatus 20 is seated on an object to be inspected, the sensor 310 may be spaced apart from the object by a preset distance. Specifically, when the seating end of the body 100 is seated on the object, the outer surface of the sensor is disposed to be spaced apart by a second distance R2 from the surface of the object to detect a defect in the object. have.

The second distance R2 may be, for example, in the range of 0.5 mm to 1 mm. When the second distance (R2) is less than 0.5 mm, the distance between the inspection object and the sensor 310 is too close, it may be difficult to accurately detect the defect, and when the second distance (R2) exceeds 1 mm, the inspection object and the The distance between the sensors 310 may become too great, and the accuracy of defect detection may be deteriorated. In addition, when the second distance R2 is in the range of 0.5 mm to 1 mm, the detection speed of the non-contact defect detection may be optimal. Specifically, when the second distance R2 is less than 0.5 mm and when the second distance R2 exceeds 1 mm, the defect detection speed and efficiency may be reduced.

In the above-described case, the second distance R2 may be greater than or equal to the first distance R1. As an embodiment, when a defect of the object is detected while the seating end of the body 100 is in complete contact with the surface of the object, the first distance R2 may be the same as the first distance R1 .

However, as another embodiment, when a defect of the object is detected in a state where the seating end of the body 100 is spaced apart from the surface of the object by a predetermined distance, the second distance R2 is the first distance R1. could be longer than Accordingly, the first distance R1 may be in the range of 0.5 mm to 1 mm, or may be shorter than 0.5 mm, even when the seating end of the body 100 is in close contact with the surface of the inspection object, from the inspection object to the sensor may be maintained within the range of 0.5 mm to 1 mm. Thereby, the accuracy of defect detection can be maintained.

As an embodiment, the defect detecting apparatus 20 may detect a defect in the object to be inspected while moving along the arrow direction of FIG. 4 . In this case, the measured value of the intensity of the induced current measured at each position on the test object may be different depending on the presence or absence of a defect in the test object.

Specifically, as exemplarily shown in FIG. 5 , the measured value of the induced current measured in the portion in which the defect is present may be larger than in the portion in which the defect is not present. In this case, as the size of the crack of the object to be inspected increases, the amount of change in the measured current value may increase. For example, damage such as a large crack may exist in the test object in a portion in which a current having a large difference from the surrounding power measurement value is measured. As such, by measuring and comparing current values according to the surface position of the inspection object and detecting damage to the inspection object, it is possible to easily detect whether the inspection object is damaged at a site in which the inspection object is located, such as a railroad car.

6 illustrates a defect detection system according to an embodiment of the present invention. Referring to FIG. 5 , the defect detection system 1 may include a defect detection apparatus 20 and a data analysis apparatus 30 . In addition, the defect detection system 1 may further include a display unit 40 .

Specific features of each component included in the defect detection apparatus 20 are the same as or similar to those described above, and thus a redundant description thereof will be omitted.

The data analysis apparatus 30 may receive and analyze the signal regarding the amount of change in the current value measured by the defect detection apparatus 20 to determine the presence or absence of a defect and the size of the object to be inspected. The data analysis apparatus 30 may determine, for example, the presence or absence of cracks and the state of cracks in the inspection object by using a data acquisition (DAQ) method.

The display unit 40 may output a result determined by the data analysis apparatus 30 . Specifically, the display unit 40 may be connected to the data analysis device 30 in a wired or wireless manner, and may output information on the presence or absence of damage and the size of the test object analyzed by the data analysis device 40 , such as cracks. . Accordingly, the operator can easily check the information on the defect of the inspection object in real time.

As described above, the defect detection apparatus 20 and the system 1 according to embodiments of the present invention detect the defect of the inspection object in a non-contact manner by measuring the amount of change in the induced current, so that the It is possible to detect the generated defects, and accordingly, by detecting the defects and damage occurring in the local part of the railroad car, it is possible to improve the safety of the railroad car by detecting the damage before the damage or accident of the railroad car due to the accumulation of damage.

In the above, the embodiment shown in the drawings has been described with reference to, but this is merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1: Fault detection system
10: bogie frame
20: binding detection device
30: data analysis device
40: display unit
100: body
200: electromagnetic induction unit
210: induced current generation unit
220: current applying unit
300: sensor unit
310: sensor
320: transmission unit

Claims (14)

a body seated on the test subject;
an electromagnetic induction unit disposed on the body and generating an induced current; and
A sensor having one surface disposed to face the electromagnetic induction unit and detecting a defect in the object to be inspected based on a change in the induced current;
The electromagnetic induction unit includes an induced current generating unit and a current applying unit,
The current applying unit includes a first applying unit and a second applying unit,
The first applying unit and the second applying unit are spaced apart from each other,
The induced current generating unit is disposed between the first applying unit and the second applying unit. According to claim 1,
The body is opened toward the object to be inspected, the defect detection apparatus having a groove in which the sensor is disposed. According to claim 1,
When the body is seated on the inspection object, the sensor is spaced apart from the inspection object by a predetermined distance, the defect detection apparatus. 4. The method of claim 3,
The preset distance is 0.5 mm to 1 mm, the defect detection device. According to claim 1,
wherein the sensor comprises an electromagnetic pickup sensor. According to claim 1,
The end of the body seated on the object to be inspected has a shape corresponding to the external shape of the object to be inspected, a defect detection apparatus. According to claim 1,
The defect detection apparatus further comprising a; when the body is seated on the object to be inspected, fixing the body to the object to be inspected. a defect detection device seated on the inspection object to detect a defect in the inspection object; and
a data analysis device for determining a defect state of the inspection object based on the result detected by the defect detection device;
The defect detection device,
a body seated on the test subject;
an electromagnetic induction unit disposed on the body and generating an induced current; and
A sensor having one surface disposed to face the electromagnetic induction unit and detecting a defect in the object to be inspected based on a change in the induced current;
The electromagnetic induction unit includes an induced current generating unit and a current applying unit,
The current applying unit includes a first applying unit and a second applying unit,
The first applying unit and the second applying unit are spaced apart from each other,
The induced current generating unit is disposed between the first applying unit and the second applying unit. 9. The method of claim 8,
The body is opened toward the object to be inspected, the defect detection system having a groove in which the sensor is disposed. 10. The method of claim 9,
When the body is seated on the inspection object, the sensor is spaced apart from the inspection object by a predetermined distance, the defect detection system. 11. The method of claim 10,
wherein the preset distance is between 0.5 mm and 1 mm. 9. The method of claim 8,
wherein the sensor comprises an electromagnetic pick-up sensor. 9. The method of claim 8,
The end of the body seated on the object to be inspected has a shape corresponding to an external shape of the object to be inspected, a defect detection system. 9. The method of claim 8,
The defect detection system further comprising a; when the body is seated on the object to be inspected, fixing the body to the object to be inspected.

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