KR102535101B1 - Eddy current inspection device for pipe inner diameter inspection - Google Patents

Abstract

The present invention provides an eddy current inspection device for inspecting the inner diameter of a pipe, capable of measuring the inner diameter of a pipe without machining an inspection tube fixing device for the size of the inspection tube fixing device to correspond to the inner diameter of the pipe. According to the present invention, the eddy current inspection device for inspecting the inner diameter of a pipe includes: an inspection tube having a conical inclined body protruding from the outer circumference of a front end entering the pipe; an eddy current sensor unit having multiple eddy current sensors arranged in a front end of the inclined body of the inspection tube at constant intervals in a radial shape; an outer diameter expanding unit connected to the outer circumference of the inspection tube and fixing the outer circumference to the inner circumference of the pipe as a worker changes the outer diameter by using the inclined body as necessary; and a controller electrically connected to the eddy current sensor unit via a signal connection line installed in an inner hollow unit of the inspection tube and calculating the inner diameter of the pipe by converting a sensing value of the eddy current sensor unit. The outer diameter expanding unit includes: a first connection disk installed on the outer circumference of the inspection tube; a second connection disk installed on the outer circumference of the inspection tube and arranged to face the first connection disk across the inclined body; an outer diameter expanding body arranged between the first connection disk and the second connection disk and having a surface coming into contact with the inclined surface of the inclined body of the inspection tube, wherein the surface is formed as an inclined surface; a bolt unit connecting the first connection disk, the outer diameter expanding body, and the second connection disk; and a nut unit screwed to one end of the bolt unit and pressing the first connection disk.

Description

Eddy current inspection device for pipe inner diameter inspection}

The present invention relates to an eddy current inspection device for inspecting the inside diameter of a pipe, and more specifically, even when the inside diameter of the pipe is different, it is possible to fix the inspection tube to the inner circumferential surface of the pipe, thereby reducing the size of the inspection tube fixing device. It relates to an eddy current inspection device for inspecting the inside diameter of a pipe, capable of measuring the inside diameter of a pipe without the need for processing to match the inside diameter.

The eddy current inspection device measures the displacement of the shape of the equipment and is used to inspect whether the equipment is manufactured within the specification or maintained within the specification.

Among the eddy current inspection devices of this type, there is an eddy current inspection device for inspecting the inside diameter of a pipe.

In this conventional eddy current flaw detector for inspecting the inner diameter of a pipe, a measuring rod having an eddy current sensor is inserted into the inside of the pipe, and the inner diameter of the pipe is measured by the displacement measurement distance of the eddy current sensor.

For reference, a driving motor unit for rotating a probe introduced into a cylindrical pipe to be inspected, a receiving slip ring inner and a transmitting slip ring inner unit configured to rotate together with the probe by the driving motor unit and generating magnetic force, and the receiving slip ring inner A receiving slip ring outer formed to be spaced apart from the outer circumference of the ring inner and generating magnetic force, a transmission slip ring outer formed to be spaced apart from the outer circumference of the transmission slip ring and generating magnetic force, and the receiving slip ring outer and transmission slip ring outer It is configured to include a slip ring housing formed to support the slip ring outer, and the signal sent from the transmission slip ring outer is magnetically transmitted to the probe through the transmission slip ring inner, and the information measured by sending eddy current from the probe is received slip Technology related to an eddy current non-destructive testing device using a non-contact slip ring characterized in that magnetic force is transmitted to the receiving slip ring outer through the ring inner is registered in the Republic of Korea Patent Publication No. 10-1645366 (published on August 5, 2016) has been disclosed.

However, the conventional eddy current inspection device for inspecting the inside diameter of a pipe including the above patent registration number 10-1645366 processes the size of the inspection tube fixture connected to the eddy current sensor to match the inside diameter of the pipe when measuring the inside diameter of the pipe. Since the eddy current sensor must be attached and manufactured, there is a problem in that the inspection tool for the eddy current must be remanufactured according to the inner diameter of the pipe.

Registered Patent Publication Registration No. 10-1645366

An object of the present invention is to solve the conventional problems as described above, by enabling the test tube to be fixed to the inner circumferential surface of the pipe even when the inner diameter of the pipe is different from each other, thereby reducing the size of the test tube fixing device to the inner diameter of the pipe. It is an object of the present invention to provide an eddy current inspection device for inspecting the inside diameter of a pipe, which can measure the inside diameter of a pipe without the need for processing to match the inside diameter of the pipe.

As a means for achieving the above object, the configuration of the present invention is an inspection tube in which an inclined body is protruded conically on the outer circumferential surface of the front end entering the inside of the pipe, and a plurality of eddy currents for generating eddy currents in the flaw detection portion of the pipe An eddy current sensor unit in which sensors are radially disposed at equal intervals at the front end of the inclined body of the inspection tube and coupled to the outer periphery of the inspection tube, and the operator changes the outer diameter using the inclined body as needed to A controller that is electrically connected to the eddy current sensor unit through an outer diameter expansion unit that can be fixed to the inner circumferential surface and a signal connection line installed in the inner hollow part of the test tube and converts the sensing value of the eddy current sensor unit to calculate the inner diameter of the pipe Including,

The outer diameter expansion part includes a first coupling disk installed on the outer periphery of the test tube, a second coupling disk installed on the outer periphery of the test tube and disposed to face the first coupling disk with an inclined body interposed therebetween; An outer-diameter extension body disposed between the first coupling disk and the second coupling disk and having a surface in contact with the inclined surface of the inclined body of the inspection tube formed as an inclined surface; It is preferable to include a bolt portion communicating with the coupling disk and a nut portion screwed to one end of the bolt portion to press the first coupling disk.

According to the configuration of the present invention, the outer diameter extension body is formed in the shape of a pair of semicircular disks and is detachable from the test tube, and a plurality of third passage holes through which the bolt part passes through the body are formed spaced apart from each other, and a mesh is formed on the outer circumferential surface. It is preferable to form a concavo-convex portion in the form of a (mesh).

In the configuration of the present invention, the first coupling disk has a plurality of first passage holes through which the bolt part passes through the body portion, and the receiving area for accommodating the portion in contact with the inclined body of the test tube is formed on the rear surface. It is preferable if it is formed in

In the configuration of the present invention, it is preferable that the bolt part is provided with an area to be screwed with the nut part, and the head is disposed on the rear surface of the second coupling disk so that the operator can adjust the screw connection with the nut part.

In the configuration of the present invention, it is preferable that the inner hollow portion of the inspection tube is blocked on the side inserted into the pipe, the nozzle hole is formed at the side end, and the blowing unit is connected to the opposite end of the side inserted into the pipe. do,

The present invention enables the inspection tube to be fixed to the inner circumferential surface of the pipe even when the inner diameter of the pipe is different, so that the inner diameter of the pipe can be measured without the need to process the size of the inspection tube fixing device to match the inner diameter of the pipe. have, have an effect.

1 is a perspective view of an eddy current inspection apparatus for inspecting the inner diameter of a pipe according to an embodiment of the present invention.
2 is a cross-sectional view of an eddy current inspection apparatus for pipe inner diameter inspection according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to explain the present invention in detail to the extent that those skilled in the art can easily practice the present invention. Other objects, features, and operational advantages, including the object, operation, and effect of the present invention, will become clearer from the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred embodiments to help those skilled in the art to understand among various possible examples, and the technical idea of the present invention is not necessarily limited or limited only by the presented embodiments. Instead, various changes, additions, and modifications including equivalents or substitutes are possible within the scope of the technical spirit of the present invention.

In addition, the expression of terms or words used in the specification and claims of the present application are defined based on the principle that the inventor can appropriately define the concept of terms in order to best explain his or her invention. , It should not be construed as limited to ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present invention. As an example, a singular expression includes a plurality of expressions unless the context clearly indicates otherwise, and an expression related to a direction is set based on a position expressed on the drawing for convenience of explanation, and is “connected” or “installed”. The expression "becoming" includes not only direct connection or installation, but also connection or installation through other components in the middle.

1 is a perspective view of an eddy current inspection device for pipe inner diameter inspection according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of an eddy current inspection device for pipe inner diameter inspection according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the configuration of the eddy current inspection apparatus for pipe inner diameter inspection according to an embodiment of the present invention is an inclined body 21 on the outer circumferential surface of the front end entering the inside of the pipe 1a An inspection tube 20 protruding conically and a plurality of eddy current sensors for generating eddy currents in the flaw detection part of the pipe 1a radially at the front end of the inclined body 21 of the inspection tube 20 It is coupled to the outer circumference of the eddy current sensor unit 10 and the inspection tube 20 disposed at equal intervals, and the operator changes the outer diameter using the inclined body 21 as needed, so that the inner circumferential surface of the pipe 1a It is electrically connected to the eddy current sensor unit 10 through the outer diameter expansion unit 30 that can be fixed and the signal connection line 40 installed in the inner hollow of the test tube 20, and the eddy current sensor unit 10 ) and a controller (not shown) for calculating the inner diameter of the pipe by converting the sensed value of the pipe.

The eddy current sensor unit 10 is composed of a plurality of eddy current sensors, and the plurality of eddy current sensors are radially arranged at equal intervals on the outer periphery of the inspection tube 20, thereby having a structure suitable for measuring the inner diameter of the pipe 1a .

The eddy current sensor unit 10 is disposed inside the pipe 1a to sense a distance value from the pipe 1a through eddy current, and converts the sensed value of the eddy current sensor unit 10 to obtain the pipe 1a By being electrically connected through a controller (not shown) and the signal connection line 40 that calculates the inner diameter of the operator can inspect the inner diameter (d1) of the pipe (1a).

The inspection tube 20 is made of a tubular shape having a hollow part formed therein. In this case, the inspection tube 20 provides an area into which the signal connection line 40 of the eddy current sensor unit 10 is inserted through the inner hollow. The inspection tube 20 provides a region to which the eddy current sensor unit 10 can be coupled, and protects the signal connection line 40 using a hollow portion so that it does not interfere with the pipe 1a.

The test tube 20 has an inclined body 21 protruding with an inclination angle on the outer periphery. The inclined body 21 is formed in a conical shape with a flat vertex at the outer periphery of the test tube 20. coupled to In addition, since the outer periphery of the conical inclined body 21 is formed as an inclined surface, when it is in close contact with the inner inclined surface of the outer diameter extending body 33 of the outer diameter extension part 30, the outer diameter extension body according to the contact point. Make the outer diameter of (33) different.

The inner hollow portion of the inspection tube 20 has a structure in which a surface inserted into the pipe 1a is blocked and a nozzle hole 22 is formed through a hole at the side end. In addition, a blower (not shown) is connected to the opposite end of the surface inserted into the pipe 1a, so that when high-pressure air is supplied through the inner hollow, the high-pressure air blows through the nozzle hole 22. By being ejected to the inner surface of the pipe 1a through the pipe 1a, it is possible to remove the contaminants on the inner surface of the pipe 1a before inspection.

The outer diameter expansion part 30 is installed on the outer periphery of the first coupling disk 31 installed on the outer periphery of the inspection tube 20 and the inspection tube 20, with the inclined body 21 interposed therebetween. A second coupling disk 32 disposed to face the first coupling disk 31, and disposed between the first coupling disk 31 and the second coupling disk 32, of the inspection tube 20 The outside-diameter extension body 33 in which the surface in contact with the inclined surface of the inclined body 21 is formed as an inclined surface, and the first coupling disk 31, the external diameter extension body 33, and the second coupling disk 32 communicate with each other. It includes a bolt part 34 and a nut part 35 that is screwed to one end of the bolt part 34 and presses the first coupling disk 31 .

The first coupling disk 31 has a circular shape and is installed to reciprocate along the test tube 20 in front of the inclined body 21 of the test tube 20 .

The first coupling disk 31 has a plurality of first passage holes 31a through which bolt portions 34 pass through the body, and is formed at a distance from each other.

The first coupling disk 31 presses the outer diameter extension body 33 in close contact with the front surface of the outer diameter extension body 33 when the bolt part 34 and the nut part 35 are coupled. In this case, the first coupling disk 31 has an accommodating area 31b formed on the rear surface to accommodate a portion of the test tube 20 that comes into contact with the inclined body 21, thereby interfering with the inclined body 21. prevent this from happening.

The second coupling disk 32 has a circular shape and is arranged to face the first coupling disk 31 with the inclined body 21 interposed at the rear of the inclined body 21 of the inspection tube 20, the inspection tube ( 20) is installed so that it can be moved back and forth. As the position of the outer diameter extension body 33 on the inclined body 21 is determined according to the position of the second coupling disk 32 on the inspection tube 20, the diameter size of the outermost outer periphery of the outer diameter extension body 33 is set

The second coupling disk 32 is formed with a plurality of second passage holes 32a spaced apart from each other through which the bolt portion 34 passes.

The second coupling disk 32 presses the outer diameter extension body 33 in close contact with the rear surface of the outer diameter extension body 33 when the bolt part 34 and the second nut part 35 are coupled.

The outer diameter extension body 33 is formed in the shape of a pair of semicircular disks and is detachable from the test tube 20, and is disposed between the first coupling disk 31 and the second coupling disk 32 to test the tube ( 20) is installed so as to surround the inclined body 21 from above and below, thereby forming one circular disk shape.

Since the pair of outer diameter extension bodies 33 are configured to face each other up and down to form a circular shape, when the outer diameter of the outer diameter extension body 33 comes into contact with the inner periphery of the pipe 1a, the center line of the test tube 20 It coincides with the center line of the pipe 1a.

The outer diameter extension body 33 has an inclined surface in contact with the inclined surface of the inclined body 21 of the inspection tube 20, so that the position of the outermost outer periphery depends on the coupling position in the state of contact with the inclined body 21. is changed

In addition, the outer diameter extension body 33 has a plurality of third passage holes 33a spaced apart from each other through which the bolt part 34 passes through the body portion, and a mesh-shaped concave-convex portion 33b on the outer circumferential surface. is formed to increase the frictional force.

The bolt part 34 is provided with an area to be screwed with the nut part 35, and a head is disposed on the rear surface of the second coupling disk 32 so that an operator can adjust the screw connection with the nut part 35.

According to the above configuration, the operation of the eddy current inspection apparatus for pipe inner diameter inspection according to an embodiment of the present invention is as follows.

In the case of measuring the inner diameter of the pipe (1a), the operator has an outer diameter extension body (33) disposed between the first coupling disk (31) and the second coupling disk (32) on the outside of the test tube (20). ) and the inclined surface of the inclined body 21 are adjusted.

In this case, the operator screws the bolt part 34 and the nut part 35, and then the outer diameter extension body 33 and the inclined body so that the outermost outer diameter of the outer diameter extension body 33 matches the inner diameter of the pipe 1a. The arrangement position between the inclined surfaces of (21) is adjusted.

Next, the operator inserts the eddy current inspection device into the pipe 1a and then adjusts the screw coupling between the bolt portion 34 and the nut portion 35, so that the first coupling disk 31 and the second coupling disk ( 32) presses the outer diameter extension body 33 so that the outer diameter extension body 33 of the outer diameter extension body 33 maintains a state consistent with the inner diameter of the pipe 1a. It is fixed to the inner surface. At this time, the concave-convex portion 33b in the form of a mesh formed on the outer circumferential surface of the outer diameter expanding body 33 expands the outer diameter by providing a frictional force between the outer circumferential surface of the outer diameter expanding body 33 and the inner circumferential surface of the pipe 1a. The fixing force of the sieve 33 is increased.

In this way, after the eddy current flaw detector is firmly fixed to the inside of the pipe 1a, if there is a contaminant on the inner surface of the pipe 1a, the operator is connected to the inspection tube 20 to the blower (shown) ) is operated to provide high-pressure air through the inner hollow of the inspection tube 20, and the high-pressure air is ejected to the inner surface of the pipe 1a through the nozzle hole 22, thereby discharging the inner surface of the pipe 1a. After removing contaminants on the surface, the inner diameter of the pipe 1a is inspected.

In this way, the sensing value obtained from the eddy current sensor unit 10 is provided to a controller (not shown) connected to the eddy current sensor unit 10 through the signal connection line 40, and is converted into a distance value by the controller (not shown). By calculating, the inner diameter of the pipe 1a is inspected.

In this way, in the case of inspecting the inner diameter of the pipe 1a, the eddy current inspection device can be matched with the inner diameter of the pipe 1a simply by changing the coupling position of the outer diameter expansion body 33, so the pipe 1a Even if the inner diameter is different, there is no need to manufacture a separate rod.

1a: pipe 10: eddy current sensor unit
20: inspection tube 21: inclined body
30: outer diameter extension part 31: first coupling disk
32: second coupling disk 33: outer diameter extension body
34: bolt part 35: nut part

Claims (5)

An inspection tube having an inclined body protruding conically on the outer circumferential surface of the front end entering the inside of the pipe;
An eddy current sensor unit in which a plurality of eddy current sensors for generating eddy current in the flaw detection portion of the pipe are radially arranged at equal intervals at the front end of the inclined body of the inspection tube;
An outer diameter extension part that is coupled to the outer circumference of the inspection tube and can be fixed to the inner circumferential surface of the pipe by changing the outer diameter using an inclined body as needed by the operator;
A controller electrically connected to the eddy current sensor unit through a signal connection line installed in the inner hollow portion of the test tube and converting the sensing value of the eddy current sensor unit to calculate the inner diameter of the pipe,
The outer diameter expansion part,
A first coupling disk installed on the outer periphery of the inspection tube;
A second coupling disk installed on the outer periphery of the inspection tube and disposed to face the first coupling disk with an inclined body interposed therebetween;
An outer-diameter extension body disposed between the first coupling disk and the second coupling disk and having a surface in contact with the inclined surface of the inclined body of the inspection tube formed as an inclined surface;
A bolt portion communicating the first coupling disk, the outer diameter expansion body, and the second coupling disk;
A nut portion screwed to one end of the bolt portion to press the first coupling disk,
The outer diameter extension body,
It is formed in the shape of a pair of semicircular disks and is detachable from the inspection tube.
A plurality of third passage holes through which the bolt part passes through the body are formed spaced apart from each other,
An eddy current inspection device for inspecting the inner diameter of a pipe, characterized in that a mesh-shaped irregularity is formed on the outer circumferential surface. delete According to claim 1,
The first coupling disk,
A plurality of first passage holes through which the bolt part passes through the body are formed spaced apart from each other,
An eddy current inspection device for pipe inner diameter inspection, characterized in that the receiving area is formed on the rear side to accommodate the portion in contact with the inclined body of the inspection tube. According to claim 1,
The bolt part,
An area to be screwed with the nut portion is provided,
An eddy current inspection device for pipe inner diameter inspection, characterized in that the head is disposed on the rear side of the second coupling disk so that the operator can adjust the screw connection with the nut portion. According to claim 1,
The inner hollow part of the test tube,
The side inserted into the inside of the pipe is blocked,
A nozzle hole is formed at the side end,
Eddy current inspection device for pipe inner diameter inspection, characterized in that the blower is connected to the opposite end of the surface inserted into the pipe.

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