KR20190059143A - Chord inside cleaning and ndi appartus of jack-up rig - Google Patents

Abstract

The present invention relates to an apparatus for cleaning the inside of a jack-up rig chord and performing a non-destructive inspection, which is able to clean the inside of a rack and a chord applied to a leg of a jack-up rig and to inspect a defect such as a defective insert and a crack of the chord on a root of a welding unit of the rack and the chord. According to the present invention, the apparatus for cleaning the inside of the jack-up rig chord and performing the non-destructive inspection comprises: a body in a hexahedron shape; a plurality of rotary wheels rotatably installed on the body to allow the body to move along a space between the rack and chord; removing modules installed to protrude from both sides of the body to remove slag and spatter formed on the root of the welding unit of the rack and chord; and an inspection module installed to come in contact with the welding unit of the rack and chord to generate an eddy current and to inspect a defect of the welding unit and chord. According to the present invention, the apparatus is able to move along an internal space of the rack and chord, remove slag and spatter formed inside the chord, and to precisely inspect a defect including a defective insert or crack of the root of the welding unit.

Description

[0001] The present invention relates to an internal cleaning and nondestructive inspection apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a jack-up rig core inner cleaning and nondestructive inspection apparatus, and more particularly to a jack- And an internal cleaning and nondestructive inspection apparatus.

With the rapid development of industries and industries internationally, the use of earth resources such as petroleum is gradually increasing, and thus the stable production and supply of crude oil is emerging as a very important issue from a global point of view.

For this reason, as marginal field or deep-sea oil field development which has been neglected because of economical hitherto has been economically feasible, development of marginal oil field or deep-sea oil field A rig equipped with a drilling rig suitable for a drilling rig is being developed.

Generally, a league is a jack-up rig (hereinafter referred to as a jack-up league) in which three or six footprints installed on a barge are set on the seabed and installed at the sea, It is a semi-submerged type that supports the deck of the sea, and it has a line shape like a hull, and a land-shaped artificial island made of an artificial island by embedding the earth, Gravity type, and disk-shaped floating structure.

The present applicant has filed a patent application for a jack-up league technique in many of the following Patent Documents 1 and 2.

For example, FIG. 1 is a diagram of a general jack up league, and FIG. 2 is an exploded view of the rack and core shown in FIG.

As shown in Fig. 1, the jack-up league 1 includes legs 3 provided to be able to move up and down on the hull 2 and jack-up league driving devices 4 to move the leg 3 downward to fix the hull 2 or to move the leg 3 upward so that the hull 2 can move.

1 and 2, the leg 3 includes a rack 5, a pair of chord 6 coupled to the front and rear surfaces of the rack 5, And a brace 7 coupled to the rack 5 to reinforce the rack 5.

Korean Patent Publication No. 10-2015-0000599 (published on January 5, 2015) Korean Patent Publication No. 10-2015-0052805 (published on May 14, 2015)

On the other hand, since the legs applied to the jack-up league have a structure supporting the hull weight of 35,000 tons or more, the stability of the structure is given the highest priority.

Particularly, since the leg structure is manufactured using the ultra-high strength steel plate, the welding work of the leg structure has the highest degree of difficulty.

Therefore, it is necessary to take countermeasures as the faults due to erroneous welding of the leg structures and the collapse of the legs due to the failure of the leg material frequently occur.

Therefore, conventionally, a leg structure is manufactured by welding a rack and a core having a length of about 6 to 11 m, and then a non-destructive evaluation is performed outside the core.

On the other hand, slag can be formed on the inner side of the core when the rack and the core are welded to each other.

However, there is a problem in that it is difficult to obtain accurate test results as the slag generates interference when ultrasonic testing (UT) is performed outside the core.

In addition, since the core is manufactured using a light material which is easily cracked during the manufacturing process such as welding or cutting, and after the welding work of the rack and the core is completed, the inside of the core is not accessible , It is difficult to confirm the soundness of the cored material.

In addition, when ultrasonic inspection is performed outside the accessible core to check for cracks in the cored inner welding improvement surface, there is a problem that accurate ultrasonic inspection can not be performed due to a spatter attached to the improvement surface.

In addition, since there is no conventional method for removing slag generated in the super-layer portion in the core, it is impossible to completely verify the super-layer welded portion.

In the jack-up league operation, when a crack occurs in the welded part or the material due to the external load, since the leg is fixed in the deep sea, before the re-docking, And there was no way to inspect the material.

However, in case of jack-up league, the quality inspection is carried out by re-docking once every 5 years. However, since the entire leg is painted, it is possible to inspect only the material exposed to the outside and welding defect, There was a problem.

It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a jacking leed core inner cleaning method capable of precisely inspecting and cleaning slag and spatter formed in a welding layer in welding process of a leg of a jack- And a non-destructive inspection apparatus.

Another object of the present invention is to provide a jack-up rig core internal cleaning and nondestructive inspection apparatus capable of detecting defects of a core material and weld defects which may occur in manufacturing a rack and a core.

Another object of the present invention is to provide a jack-up rig core internal cleaning and nondestructive inspection apparatus which can always observe and inspect defects in the core which may be caused by external load during operation of a jack up league.

In order to accomplish the above object, the jack-up rig core in-line cleaning and nondestructive testing apparatus according to the present invention is characterized by cleaning the rack and the core interior applied to the legs of the jack-up rig, A body formed in a hexahedron shape for inspecting a defect including a crack of the core, a plurality of rotating wheels rotatably installed on the body such that the body is movable along a space between the rack and the core, A removal module for removing slag and spatter formed on both sides of the welded portion of the welded portion of the rack and the cores, and a probe installed in contact with the welded portion of the rack and the cored portion to generate an eddy current, And a module.

The present invention relates to a driving module for generating a driving force for moving along a rack and a core inner space, a photographing module mounted on the body and photographing a rack and a core inner space, and a driving module for driving the driving module, And a control unit for controlling the control unit.

The removal unit may include at least one removal module disposed at a front end and a rear end of the body so as to be wider than the width of the body and protruding from both sides of the body, and the removal module may be installed at a front end or a rear end of the body A pair of support blades installed at both ends of the installation block so as to be parallel to the outside, and a slag and a spatter which are provided in the installation space between the pair of support blades and formed on the improvement surface of the rack and the core, And a removing blade for removing the cleaning blade.

The pair of support blades and the removal blade are formed in a shape corresponding to a space between the rack and the improvement surface of the core, respectively, and the installation space is provided with a blade And an elastic member for providing an elastic force is provided.

Wherein the inspection module includes an eddy current probe for inspecting defects by generating an eddy current in a flaw portion of the rack and the cored portion, the eddy current probe detachably attaching the slag and the spatter, and then mounting the removal blade in a detached position .

Wherein the eddy current probe includes a body formed in a cylindrical shape and a probe protruded forward in the body, a coil is wound a plurality of times on an outer circumferential surface of the probe, and a tip of the probe is in contact with an improvement surface of the core Is installed.

The driving module includes a driving motor installed on the body and generating a driving force, and a power transmitting unit transmitting driving force generated by the driving motor to the rotating wheel.

The driving module is provided as a winder which is installed outside the body or the leg and generates a driving force to move the body by winding or loosening a wire connected to the body.

The control unit controls the data stored in the inspection module and the image captured by the image sensing module to be stored in an internal memory or to be transmitted to an external management terminal through a wired or wireless communication method.

And a suction module for sucking the slag and the spatters removed by the removing unit and discharging the slag and the spatter to the outside of the leg.

As described above, according to the jack-up rig core in-line cleaning and nondestructive inspection apparatus of the present invention, slag and spatter formed inside the core are removed while moving along the inner space of the rack and the core, It is possible to obtain an effect of precisely inspecting defects including defects and cracks.

According to the present invention, the reliability of the evaluation result can be improved by performing the non-destructive fracture evaluation after removing the slag and the spatter formed in the super-layer welded portion of the rack and the cored.

Further, according to the present invention, it is possible to accurately check the stability of a structure by inspecting defects by an eddy current flaw detection method using an eddy current probe.

Further, according to the present invention, during the operation of the jack-up league, the inspection device is inserted through the opening at the upper end of the leg to inspect the welded portion and the defect of the material by the external load accurately without re-docking, thereby preventing an accident caused by a defect in the leg Can be obtained.

FIG. 1 is a diagram showing a general jack up league,
Figure 2 is an exploded view of the rack and core shown in Figure 1,
3 is a view for explaining a manufacturing process of a rack and a core,
FIG. 4 is a view for explaining a cutting process of the core shown in FIG. 3,
5 is a perspective view of a jack-up rig core in-line cleaning and nondestructive inspection apparatus according to a preferred embodiment of the present invention,
FIG. 6 is a block diagram of the jack-up rigid-core internal cleaning and nondestructive inspection apparatus shown in FIG. 5;
7 is a view for explaining the principle of defect inspection using an eddy current probe,
8 is a configuration diagram of an eddy current probe,
FIG. 9 is a process diagram for explaining a step-by-step operation method of a jack-up rig core internal cleaning and nondestructive inspection apparatus according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A jack-up rig core internal cleaning and nondestructive inspection apparatus according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

In this embodiment, the configuration of the jack-up league shown in Figs. 1 and 2 and the configurations of the rack and the core are described.

Of course, the jack-up rig core in-line cleaning and nondestructive inspection apparatus according to the present invention is not limited to the jack-up rig shown in FIGS. 1 and 2, but may be applied to a pipe-shaped object It should be noted that the present invention can be modified so as to be applicable to various types of apparatuses for cleaning the interior and inspecting defects.

Hereinafter, terms indicating directions such as 'left', 'right', 'forward', 'rearward', 'upward' and 'downward' are defined as indicating respective directions based on the states shown in the respective drawings do.

First, referring to FIGS. 3 and 4, a manufacturing process of a rack and a core will be described.

FIG. 3 is a view for explaining a manufacturing process of a rack and a core, and FIG. 4 is a view for explaining a cutting process of the core shown in FIG.

The manufacturing process of the rack and the core will be described. As shown in FIG. 3 (a), the flat plate-shaped core 6 is cut into a rectangular plate shape through the cutting process.

At this time, as shown in FIGS. 4A and 4B, at both sides of the core 6, heat-affected zone cracks (hereinafter referred to as "Quot; HAZ ") is generated.

As shown in FIGS. 4 (c) and 4 (d), in the preliminar edge tapering process in which the both ends of the core die 6 are secondarily cut from the top to the bottom in a downward direction, do.

Therefore, as shown in FIG. 4 (e), cracks due to the overlapping of the brittle zones may occur at both sides of the core 6.

As shown in FIG. 3 (b), the cut cored part 6 is formed into a substantially semicircular shape in cross section through the hot forming process.

Subsequently, as shown in FIGS. 3 (c) to 3 (d), a corrugated surface is formed on both edges of the core 6 through a finishing process.

A pair of cores 6 disposed on the upper and lower surfaces of the rack 5 are joined to each other by a welding method such as FCAW (Flux Cored Arc Welding) from the outside of the core 6.

Here, slag and spatter are formed in the inside of the core 6, particularly inside the both ends of the cored 6 to be welded, during the manufacturing process by welding the rack 5 and the cored 6, May occur.

Therefore, the present invention removes slag and spatter formed inside the core while moving along the inner space of the rack and the core, and inspects defects such as poor penetration of the weld layer.

5 and 6, the construction of a jack-up rig core internal cleaning and nondestructive testing apparatus according to a preferred embodiment of the present invention will be described in detail.

FIG. 5 is a perspective view of a jack-up rig core inner cleaning and nondestructive testing apparatus according to a preferred embodiment of the present invention, and FIG. 6 is a block diagram of a jack jack rig core inner cleaning and nondestructive testing apparatus shown in FIG.

As shown in FIGS. 3 and 4, a jack-up rig core internal cleaning and nondestructive testing apparatus 10 according to a preferred embodiment of the present invention includes a body 20 formed in a substantially hexahedron shape, a rack 5, A plurality of rotating wheels 30 rotatably mounted on the body 20 so as to be movable along a space between the racks 5 and the cores 6, A removal module 40 for removing the slag and the spatter formed on the welding layer layer and an inspection module installed in contact with the welding part between the rack 5 and the cored part 6 for inspecting defects of the welding part and the cored part 6 50).

In accordance with a preferred embodiment of the present invention, the jack-up rig core internal cleaning and nondestructive testing apparatus 10 includes a driving module 60 for generating a driving force for moving along the internal space of the rack 5 and the core 6, A photographing module 70 for photographing the internal space of the rack 5 and the cored unit 6, and a control unit 80 for controlling the driving of each device.

In this embodiment, the legs 3 are in a state of being manufactured by welding the cores 6 with the racks 5 having a length of about 6 to 11 m.

The body 20 is a portion where each device is installed, and may be formed in a substantially rectangular plate-like hexahedron shape.

The body 20 is provided with an installation hole 21 in which the rotary wheel 30 is installed and the rotary wheel 30 can be rotatably installed on a rotary shaft installed in the installation hole 21. [

The removal unit 40 may include at least one removal module 41 provided at the front end and the rear end of the body 20 so as to be wider than the width of the body 20 and installed to protrude from both sides of the body 20 .

Each of the removing modules 41 includes a mounting block 42 installed at the front end or the rear end of the body 20, a pair of supporting blades 43 arranged at both ends of the mounting block 42 in parallel to the outside, And a removal blade 44 which is installed between the pair of supporting blades 43 and removes the slag and the spatter formed on the improvement surface of the rack 5 and the cored 6.

An installation space for installing the removing blade 44 is provided between the pair of supporting blades 43. The removing blade 44 is provided on the outer side of the supporting blade 43 by elastic force of an elastic member (not shown) As shown in FIG.

The elastic member may be a spring member such as a coil spring or a leaf spring and may provide an elastic force such that one end of the removal blade 44 is in close contact with the improvement surface of the rack 5 and the core 6, .

The removal blade 44 is moved on the improvement surface of the rack 5 and the core 6 while moving by the movement of the body 20 in a state of being in contact with the improvement surface of the rack 5 and the core 6 The formed slag and spatter can be removed.

For this purpose, the pair of supporting blades 43 and the removing blade 44 may be formed in a substantially right-angled triangular shape in cross section so as to correspond to the space between the rack 5 and the improvement surface of the core 6.

The inspection module 50 may include an eddy current probe 51 for generating an eddy current at the flaw portions of the rack 5 and the core 6 to check for defects (see FIGS. 7 and 8).

The eddy current probe 51 may be mounted on the removal module 40 to inspect defects in the welds and the cored 6.

That is, in this embodiment, the removal blade 44 provided in the installation space between the pair of support blades 43 provided in the removal module 41 is detached, and the eddy current probe 51 is attached to the installation space Defects of the welded portion and the core die 6 can be inspected.

FIG. 7 is a view for explaining the principle of defect inspection using an eddy current probe, and FIG. 8 is a configuration diagram of an eddy current probe.

As shown in Fig. 7, when a high-frequency current is passed through the excitation coil, an eddy current is generated in the object to be inspected, that is, the flaw portion of the rack 5 and the core 6.

Here, the eddy current probe 51 can sense that the distribution state of the eddy current changes due to a defect such as a failure in penetration of the welded portion or a crack in the core 6.

8, the eddy current probe 51 includes a body 52 formed in a substantially cylindrical shape and a probe 53 protruding forward from the inside of the body 52. The eddy current probe 51 includes a probe 52, On the outer circumferential surface, the coil is wound several times.

The tip of the probe 53 may be provided so as to be in contact with the improvement surface of the core 6.

The eddy current probe 51 constructed as described above generates a eddy current in the flaw portions of the rack 5 and the core 6 by using a magnetic field by flowing a high frequency current to the coil and detects a change in the distribution state of the eddy current It is possible to detect whether or not a defect such as a crack in the core 6 and an infusion failure of the welded portion occurs.

As described above, according to the present invention, the removing blade is mounted to move the inside of the rack and the core to remove the slag and the spatter generated in the welding process, remove the removing blade, and install the eddy current probe to detect the eddy current distribution state It is possible to inspect the core zfor and defects in the weld layer.

6, the jack-up rig core-in-core cleaning and nondestructive inspection apparatus 10 according to the preferred embodiment of the present invention includes a suction module (not shown) for sucking and discharging slag and spatter removed by the removal blade 44, (90).

The suction module 90 may include a vacuum pump that forms a vacuum and a vacuum hose that sucks slag and spatters by using a vacuum formed in the vacuum pump and discharges the slag and the spatters to the outside.

The driving module 60 may include a driving motor that is supplied with power from the outside of the leg 3 through a power cable or a driving motor that is driven by receiving power from a battery (not shown) installed in the body 20 have.

A gear unit (not shown) for transmitting a driving force generated by the driving motor, that is, a rotational force, may be provided between each rotary wheel 30 and the output shaft of the driving motor.

A driving force is transmitted between a rotary shaft provided with a pair of rotary wheels 30 provided at the front end of the body 20 and a rotary shaft provided with a pair of rotary wheels 30 provided at the rear end of the body 20 A pulley and a belt (not shown) may be applied.

Of course, the present invention is not limited thereto, and may be modified to apply various types of power transmission units for transmitting the driving force generated by the driving motor.

The present invention can be modified to provide a rotary wheel 30 on the lower surface of the body 20 and to install the drive motor and the power transmission unit on the upper surface or lower surface of the body 20. [

In the present embodiment, the drive module 60 is installed in the body 20, but the present invention is not limited to the case where the drive module 60 such as a winder is installed outside the leg 3, To wind the wire connected to the body 20 to move the body 20.

For this, a connecting member may be provided at the front and rear ends of the body 20 so as to bind the wires.

In addition, the present invention is also applicable to the case where the driving module 60 such as a winder is installed on the body 20 to wind or unwind the wire to move the body 20, or the driving module 60 is removed, Or may be changed to move the body 20 by winding or unwinding.

The photographing module 70 may include one or more cameras installed on the upper surface of the body 20. [

For example, the camera may be installed at the front end and the rear end or both sides of the body 20, respectively.

The control unit 80 is driven by receiving power from outside the legs 3 through a power cable or by receiving power from a battery installed in the body and driving the inspection module 50, the driving module 60, and the imaging module 70 Can be controlled.

The control unit 80 stores the data sensed by the inspection module 50 and the image photographed by the photographing module 70 in an internal memory (not shown) or transmits them to an external management terminal through a wired or wireless communication method .

To this end, a communication module (not shown) communicating with an external management terminal may be further provided in this embodiment.

The control module 80 is provided outside the leg 3 and the inspection module 50, the driving module 60 and the photographing module 70 are connected to each other via a power supply and a communication cable, And may be provided with a remote controller or a teaching manipulator for controlling the driving.

Next, a detailed description will be made of a method of operating the jacked-up core core inner cleaning and non-core inspection apparatus according to the preferred embodiment of the present invention.

FIG. 9 is a process diagram for explaining a step-by-step operation method of a jack-up rig core internal cleaning and nondestructive testing apparatus according to a preferred embodiment of the present invention.

9, a pair of removal modules 41 are respectively assembled to the front and rear ends of the body 20 of the jack-up rigid core cleaning and nondestructive inspection apparatus 10.

At this time, a pair of supporting blades 43 are provided on both sides of each of the removing modules 41, and a removing space for removing the elastic members, the slag and the spatters is provided in the space between the pair of supporting blades 43. [ The blade 44 is installed.

The rotary wheel 30 installed in the body 20 in the state of being inserted into the space between the rack 5 and the core 6 of the leg 3 in the step S12 receives the driving force generated by the driving module 60 and rotates , The body (20) moves along the space between the rack (5) and the core (6).

Then, the removal blade 44 moves in a state in close contact with the improvement surface of the rack 5 and the cored 6, thereby removing the slag and the spatter formed in the rack 5 and the cored 6 (S14 ).

At this time, the suction module 90 installed on the body 20 can discharge the slag and the spatter removed by the removing blade 44 to the outside of the legs 3.

When the slag and spatters are removed, the operator removes the removing blade 44 from each of the removing modules 41 in step S16, and the inspection blade 50 is provided between the pair of supporting blades 43 The eddy current probe 51 is installed.

Here, the tip of the eddy current probe 51 is provided so as to be in contact with the improved surface of the rack 5 and the cored electrode 6.

The rotary wheel 30 mounted on the body 20 in the state of being inserted into the space between the rack 5 and the core 6 of the leg 3 again receives the driving force generated by the driving module 60, And the body 20 moves along the space between the rack 5 and the core 6.

The eddy current probe 51 generates an eddy current in the flaw portion of the core 6 while moving according to the movement of the body 20 and detects the distribution state of the eddy current so as to detect cracks of the core 6 and penetration Defects such as defects are inspected (S20).

At this time, the photographing module 70 installed on the body 20 photographs the inner space of the rack 5 and the core 6 while moving according to the movement of the body 20.

The control unit 80 stores the data sensed by the eddy current probe 51 and the image data photographed by the photographing module 70 and analyzes the data to precisely identify the defects of the rack 5 and the cored unit 6 Can be inspected.

Through the above-described process, the present invention removes slag and spatter formed inside the core while moving along the inner space of the rack and the core, and precisely inspects defects including penetration failure and cracks in the welded layer .

The present invention can improve the reliability of the evaluation result by performing the non-destructive test evaluation after removing the slag and the spatter formed in the super-layer welded portion of the rack and the core.

Further, the present invention can accurately check the stability of a structure by inspecting defects by an eddy current flaw detection method using an eddy current probe.

Meanwhile, in the above embodiment, it has been described that the defects of the welds of the rack and the cores generated during the manufacturing process of the leg are examined, but the present invention is not limited thereto.

That is, the present invention can inspect defects such as cracks and welds due to external loads by inserting the inspection device through the opening at the upper end of the leg during the operation of the jack up league.

Therefore, according to the present invention, it is possible to precisely inspect welds and workpiece defects in the core during operation of a jack-up rig without re-docking, thereby preventing an accident caused by defects in the legs.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention relates to a jack-up rig core in-line cleaning and non-destructive inspection for precisely inspecting defects including penetration failure and cracks in a welded layer by removing slag and spatter formed inside the core while moving along the inner space of a rack and a core Applies to inspection equipment technology.

1: Jack-up league 2: Hull
3: Leg 4: Jack-up rig drive
5: rack 6: cored
7: Brace
10: jack-up league cored internal cleaning and nondestructive testing device
20: Body 21: Installation ball
30: rotation wheel 40: removal
41: removal module 42: installation block
43: Supporting blade 44: Removing blade
50: inspection module 51: eddy current probe
52: body 53: probe
60: driving module 70: photographing module
80: control unit 90: suction module

Claims (10)

An apparatus for cleaning a rack and a core in a leg applied to a jack up league and inspecting a defect including cracks in the core and cracks in the layer of the welded portion of the rack and the core,
A body formed in a hexahedron shape,
A plurality of rotating wheels rotatably mounted on the body such that the body is movable along a space between the rack and the core,
A removal module installed on both sides of the body to remove the slag and the spatter formed in the welding layer of the rack and the core,
And an inspection module installed in contact with the welded portion of the rack and the core to generate an eddy current to inspect defects of the welded portion and the core. The method according to claim 1,
A driving module for generating a driving force for moving along the rack and the inner space of the core,
A photographing module installed in the body and photographing a rack and a core inner space,
Further comprising a control unit for controlling driving of the inspection module, the driving module, and the photographing module. 3. The method according to claim 1 or 2,
Wherein the removing unit includes at least one removing module provided at both ends of the body so as to be wider than the width of the body and protrude from both sides of the body,
Wherein the removal module comprises a mounting block installed at a front end or a rear end of the body,
A pair of supporting blades installed at both ends of the installation block in parallel to the outside,
And a removal blade installed in an installation space between the pair of support blades and removing the slag and the spatter formed on the improvement surface of the rack and the core. . The method of claim 3,
The pair of supporting blades and the removing blade are formed in a shape corresponding to the space between the rack and the improvement surface of the core,
Wherein the installation space is provided with an elastic member that provides an elastic force to bring the removal blade in close contact with the improvement surface of the rack and the cored. The method of claim 3,
Wherein the inspection module includes an eddy current probe for generating an eddy current at a flaw portion of the rack and the core to inspect the defect,
Wherein the eddy current probe is mounted at a position where the removal blade is detached after the slag and the spatter are detached. 6. The method of claim 5,
The eddy-current probe includes a body formed in a cylindrical shape
And a probe provided in the body so as to protrude forward,
A coil is wound a plurality of times on the outer circumferential surface of the probe,
Wherein the tip of the probe is installed in contact with the improvement surface of the core. 3. The method of claim 2,
The driving module includes a driving motor installed in the body and generating driving force,
And a power transmitting unit for transmitting the driving force generated by the driving motor to the rotating wheel. 3. The method of claim 2,
Wherein the drive module is installed outside the body or leg,
And a winding unit that generates a driving force to move the body by winding or loosening a wire connected to the body. 3. The method of claim 2,
Wherein the control unit controls to store data sensed by the inspection module and an image photographed by the photographing module in an internal memory or to transmit the sensed data to an external management terminal through a wired or wireless communication method. Cleaning non-destructive inspection device. 3. The method of claim 2,
Further comprising a suction module for sucking the slag and the spatter removed by the removing unit and discharging the slag and the spatter to the outside of the leg.

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