KR20160143601A - Nondestructive inspection device movable in pipes for shielding radioactivity - Google Patents

Abstract

The present invention relates to a pipe internal transferring device for a non-destructive test to shield radioactivity capable of being entered into the inside of a pipe; and testing a welding unit of the pipe. The non-destructive test device comprises: a body in which components are mounted; a rear left wheel and a rear right wheel which are positioned in the rear of the body, and are driven by a motor; a rotation plate which is positioned in the front of the body to be rotated in left and right directions; a front left wheel and a front right wheel which are fixed to the rotation plate, and are projected to the outside of the body; a radiation capsule which mounts a radiation source; a container which stores the radiation capsule in a shielding state; a transmitting pipe which is connected to the container and transmits the radiation capsule; a collimeter which is connected to a front end of the transmitting pipe; and a radiation source transferring unit which transfers the radiation capsule between the container and the collimeter through the transmitting pipe. The rotation plate is rotated in the left and right directions by force applied to the front left wheel or the front right wheel. The present invention is provided to rotate the front left wheel and the front right wheel connected to the rotation plate in the left and right directions, thereby being naturally centered in a flexible pipe; and protecting safety of a worker by using a secondary shielding plate arranged in both sides of the collimeter.

Description

≪ Desc / Clms Page number 1 > Nondestructive inspection device movable in pipes for shielding radioactivity &

The present invention relates to a pipe internal transfer device for nondestructive inspection for radioactive shielding which can enter a pipe and inspect welded parts of the pipe.

Generally, nondestructive inspection is widely used in the inspection of welds in piping for transporting fluids or in ships. These non-destructive tests usually check the welds for defects using radiation.

The nondestructive inspection using radiation is a method of inspecting the internal defect of the inspected object by transmitting the radiation such as X-rays or gamma rays from the radioactive material to the welded part or structure to be inspected and regenerating the image from the transmitted radiation to the film or CRT .

A radiation irradiation apparatus for such nondestructive inspection includes a radiation source portion having a capsule having radiation isotopes such as iridium embedded therein at one end thereof and a connector at the other end thereof, a container for storing the radiation source portion in a shielded state, And a transmission pipe connected to the container unit and guiding the radiation source unit to the inspection position.

In the inspection of piping welds, the radiator used in this nondestructive inspection is carried in by the operator in case of a large tube, but in this case, there is a high possibility of suffocation due to lean air in the piping.

When the diameter of the pipe is small, the user can not carry it in. Therefore, it is generally carried by a proper conveying device. At this time, for accurate inspection, the collimator having the radiation source portion is positioned at the center of the pipe and positioned exactly on the weld line of the pipe, but it is difficult to control the radiation irradiation device so that the collimator is correctly positioned.

In addition, conventionally, the radiation irradiation apparatus which can be transferred to the inside of the pipe only has a function of running straight, and it is difficult to convey while keeping the center naturally in the bent pipe, so that the problem of colliding with the inner wall of the pipe or overturning .

Generally, when the collimator of the irradiation apparatus is located on the weld line of the pipe, the radiation source is transferred to the collimator to irradiate the radiation. At this time, an external shielding agent is attached to the outside of the pipe to prevent exposure of the worker. If the radiation emitted from the collimator deviates from the external shielding agent, safety of workers around the pipe is threatened.

Korean Patent Application No. 20-2007-0006172

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a radiation shielding structure capable of naturally centering even in a bent pipe, accurately positioning a collimator on a weld line, And to provide a piping internal transfer device for non-destructive inspection.

According to another aspect of the present invention, there is provided a nondestructive inspection apparatus capable of being transferred to a pipe, A rear left wheel and a rear right wheel positioned rearward of the main body and driven by a motor; A rotating plate rotatably connected to the front of the main body in the left-right direction; A front left wheel and a front right wheel fixed to the rotating plate and projecting out of the main body; A radiation capsule with a radiation source embedded therein; A container for storing the radiation capsule in a shielded state; A transfer tube connected to the container for transferring the radiation capsule; A collimator coupled to the forward end of the transfer tube; A radiation source transferring unit for transferring the radiation capsule between the container and the collimator through the transfer tube; .

A first auxiliary shielding plate in the form of a vertical wall fitted to an outer diameter of the collimator and shielding one side of the collimator; A second auxiliary shielding plate in the form of an upright wall fitted to an outer diameter of the collimator and shielding the other side of the collimator; .

The first auxiliary shielding plate and the second auxiliary shielding plate each include an auxiliary cover vertically extending by a predetermined length and inclined outwardly, and a lead shielding member inserted into the auxiliary cover.

According to another aspect of the present invention, there is provided a non-destructive inspection apparatus capable of being transferred into a pipe, comprising: a main body to which components are mounted; A rear left wheel and a rear right wheel positioned rearward of the main body and driven by a motor; A front left wheel and a front right wheel positioned in front of the main body; A radiation capsule with a radiation source embedded therein; A container for storing the radiation capsule in a shielded state; A transfer tube connected to the container for transferring the radiation capsule; A collimator coupled to the forward end of the transfer tube; A radiation source transferring unit for transferring the radiation capsule between the container and the collimator through the transfer tube; A first auxiliary shielding plate in the form of a vertical wall fitted to an outer diameter of the collimator and shielding one side of the collimator; A second auxiliary shielding plate in the form of an upright wall fitted to an outer diameter of the collimator and shielding the other side of the collimator; .

According to the present invention, the front left wheel and the front right wheel coupled to the rotary plate are configured to be rotatable in the left and right directions, so that the center can naturally be centered even in a bent pipe. It is possible to provide a pipe internal transfer device for nondestructive inspection for shielding radioactivity that can accurately position the workpiece and protect the safety of the worker by the auxiliary shield plate disposed on both sides of the collimator.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a pipe internal transfer device for nondestructive inspection according to an embodiment of the present invention. FIG.
2 is a plan view of the pipe internal transfer device for nondestructive inspection of FIG. 1 viewed from above.
3 is a side view of the piping internal transfer device for nondestructive inspection of FIG.
Fig. 4 is a view showing a configuration of a rotary plate or the like in the pipe internal transfer device for nondestructive inspection of Fig. 1;
5 is a diagram showing a state in which a pipe internal transfer device for nondestructive inspection according to an embodiment of the present invention is located in a pipe.
6 is a view showing an image transmitted by a camera in a pipe internal transfer device for nondestructive inspection according to an embodiment of the present invention.
7 is a side view showing a collimator portion in a pipe internal transfer device for nondestructive inspection according to another embodiment of the present invention.
Fig. 8 is a perspective view showing the auxiliary shield plate of Fig. 7 in an exploded manner. Fig.
FIG. 9 is a view showing in detail the inside of the auxiliary shielding plate in FIG.
10A is a diagram showing an ideal path of radiation in a general collimator.
10B is a view showing a path of actual radiation in a conventional collimator in a pipeline.
FIG. 10C is a view showing the path of radiation in the pipe internal transfer device for nondestructive inspection of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. The same reference numerals in the drawings denote like elements throughout the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a pipe internal transfer device for nondestructive inspection according to an embodiment of the present invention. FIG. 2 is a plan view of the pipe internal transfer device for nondestructive inspection of FIG. 1 viewed from above. 3 is a side view of the piping internal transfer device for nondestructive inspection of FIG. Fig. 4 is a view showing a configuration of a rotary plate or the like in the pipe internal transfer device for nondestructive inspection of Fig. 1; 5 is a diagram showing a state in which a pipe internal transfer device for nondestructive inspection according to an embodiment of the present invention is located in a pipe. 6 is a view showing an image transmitted by a camera in a pipe internal transfer device for nondestructive inspection according to an embodiment of the present invention.

The piping internal transfer device (hereinafter referred to as piping internal transfer device) 100 of the present invention is configured to be able to inspect welds or the like of pipelines using radiation while moving inside piping. The piping internal feeding device 100 can be controlled wirelessly by control means such as the notebook 101 by wireless communication technology.

The pipeline internal transfer device 100 includes a main body 110, a rear left wheel 121 and a rear right wheel 122, a rotation plate 130, a front left wheel 141 and a front right wheel 142, A container 150, a transfer tube 155, a collimator 160, a radiation source transfer unit 181, 183 and 184, a camera 170, and the like.

Various components are mounted on the main body 110. The main body 110 may be formed in a flat shape so as to be movable in the piping 10.

The rear left wheel 121 and the rear right wheel 122 are located behind the main body 110 and are driven by a motor. The rear left wheel 121 and the rear right wheel 122 may be individually driven by separate drive motors. When the rear left wheel 121 and the rear right wheel 122 are driven by the driving means, the main body 110 proceeds in the pipe 10. [

The radiation capsule 151 contains a radiation source of a radioactive element such as iridium-192. The radiation source is used to investigate defects such as welds in pipes. These radiation capsules 151 are transported to the container 150 and stored safely in a shielded state when irradiation of the radiation source is not required.

The transfer tube 155 becomes a passage through which the radiation capsule 151 can be transferred. The transfer tube 155 is connected to the container 150 and the collimator 160.

The collimator 160 is connected to the front end of the transfer tube 155. The collimator 160 serves to limit the irradiation direction of the radiation so that the radiation can be emitted only in a specific direction. The collimator 160 is made of a material that can shield radiation well, such as lead (Pb), tungsten (W), and the like.

The radiation source transfer unit transfers the radiation capsule 151 between the container 150 and the collimator 160 through the transfer tube 155. The radiation source transfer unit includes a pigtail 181 connected to the radiation capsule 151 and formed with a spiral, a transmission gear (not shown) coupled with the pigtail 181 in a gear form, a motor 184 for driving the transmission gear, (183), and the like.

The driving force of the motor 184 is transmitted to the transmission gear and the pigtail 181 so that the radiation capsule 151 connected to the pigtail 181 can be transported between the container 150 and the collimator 160 .

1 and 4, the rotation plate 130 is rotatably connected to the front of the main body 110 in the left-right direction. Here, the left and right directions refer to the left and right directions in the direction in which the main body 110 advances. The rotation plate 130 may be rotatably connected to the main body 110 in the left-right direction through the connection portion 131.

The front left wheel 141 and the front right wheel 142 are coupled to the rotation plate 130 and protrude to the outside of the main body 110.

The front left wheel 141 may be, for example, two and fastened together with the wheel fastening portion 143. The wheel coupling portion 143 may be connected to the connection rods 145 and 146 connected to the rotation plate 130. The connecting rods 145 and 146 may be rotatably connected to the rotating plate 130 by fastening members 134. The connecting rods 145 and 146 are rotatable about the fastening member 134 and the front left wheel 141 can be moved in the left and right directions as the connecting rods 145 and 146 rotate.

The front right wheel 142 also has the same configuration as the front left wheel 141. [ The front right wheel 142 is formed of two pieces and can be fastened together with the wheel fastening part 144. The wheel coupling portions 144 may be connected to connection rods 147 and 148 connected to the rotary plate 130. The connecting rods 147 and 148 may be rotatably connected to the rotating plate 130 by fastening members 135. The connecting rods 147 and 148 are rotatable around the fastening member 135 and the front right wheel 142 can be moved in the left and right directions as the connecting rods 147 and 148 rotate.

A plurality of fasteners 132 may be formed on the left side of the rotary plate 130 to be spaced apart from each other by a predetermined distance so as to be fastened to the connection rod 145. The connection rod 145 may be formed with an opening 145a into which a fastening member for fastening with the fastening opening 132 is inserted. The front left wheel 141 is held in a fixed position by fastening the rotation plate 130 and the connecting rod 145 by inserting the fastening member in a state where the fastener 132 and the opening 145a are matched with each other .

A plurality of fasteners 133 for fastening with the connecting rod 147 may be formed on the right side of the rotary plate 130. The connecting rod 147 is provided with an opening 147a for fastening with the fastener 133, Can be formed. When the coupling member is inserted between the fastener 133 and the opening 147a and the rotary plate 130 and the connecting rod 147 are fastened together, the front right wheel 142 is held in a fixed position.

The degree of extension of the front left wheel 141 and the front right wheel 142 to the outside of the main body 110 can be adjusted according to the positions of the fasteners 132 and 133 to which the connecting rods 145 and 147 are fastened.

For example, when the diameter of the pipe 10 is small, the connecting rods 145 and 147 are fastened to the fasteners 132 and 133 so that the front left wheel 141 and the front right wheel 142 are positioned close to the main body 110 As shown in Fig. When the diameter of the pipe 10 is large, the front left wheel 141 and the front right wheel 142 are fixed in a state of being positioned away from the main body 110. The number of fasteners 132 and 133 to which the connecting rods 145 and 147 are fastened and the separation distance between the fastening holes 132 and 133 can be adjusted depending on the type of the pipe 10 to be inspected .

The pipe 10 to which the pipe internal transfer device 100 is moved includes not only a straight pipe but also a pipe 10 bent in a rounded shape. When the pipe internal transfer apparatus 100 moves from the piping 10, the piping internal transfer apparatus 100 often comes into contact with the wall of the piping 10 or overturns.

The rotation plate 130 to which the front left wheel 141 and the front right wheel 142 are fixed is rotated in the left and right direction to prevent the pipe internal transfer device 100 from being rolled over in the pipe 10. [ Lt; / RTI >

Only one of the wheels of the front left wheel 141 and the front right wheel 142 is in contact with the pipe 10 while the other wheel is in a noncontact state Can proceed.

For example, when the front left wheel 141 moves in contact with the curved pipe 10, the front left wheel 141 is moved from the inner wall of the pipe 10 Vertical drag can work.

Accordingly, the rotation plate 130 to which the front left wheel 141 is fixed can be rotated by the vertical drag. As the rotation plate 130 is rotated, the front left wheel 141 is adjusted in position in the pipe 10, The piping inner feeding device 100 can be moved in the direction of approaching the center of the pipe 10 while the piping 10 is in contact with the inner wall of the piping 10.

The pipe internal conveyance apparatus 100 of the present invention is capable of moving the rotary plate 130 by a force (vertical drag) acting on the front left wheel 141 or the front right wheel 142 when proceeding in the pipe 10. [ So that the piping inner feeder 100 can easily maintain the correct position in the pipe 10. [0064] As shown in Fig.

In the present invention, a camera 170 is disposed behind the collimator 160 to provide an image for setting a correct position of the collimator 160. When inspecting welds or the like in the piping 10 by the radiation source, the collimator 160 on which the radiation source is positioned should exactly match the line of the weld.

To this end, in the present invention, the position where the camera 170 is directed is adjusted so as to become the weld line of the directly underneath chamber of the collimator 160 before the pipe internal transfer device 100 enters the pipe 10. Next, when the pipeline internal transfer apparatus 100 is transferred in the piping 10, it is checked whether the collimator 160 is correctly positioned on the weld line according to the image provided wirelessly from the camera 170, It is possible to carry out the inspection by the inspection.

For example, a cross-shaped line is displayed on the image provided by the camera 170 as shown in FIG. 6, and when the cross line coincides with the weld line in the pipe 10, the collimator 160 It can be confirmed that it is positioned.

To this end, a mounting bar 190 may be provided in which the camera 170 is mounted while extending forward of the main body 110. The fixing bar 190 can be adjusted in length from front to back by turning the adjusting screw 191.

The camera 170 can be mounted on the mounting bar 190 by the camera mount 171. [ For example, when the adjustment screw 172 on the camera mount 171 is turned, the position of the camera mount 170 can be moved forward and backward by moving the position of the camera mount 171 in the mount bar 190. In addition, the camera 170 can be rotated in the vertical direction on the camera mount 171, and the position where the camera 170 is directed can be adjusted.

A collimator rest 195 on which the collimator 160 is mounted may be connected to the end of the restricting bar 190. The collimator 160 is adjustable in the vertical direction by turning the adjustment screw 196 coupled with the collimator rest 195. As shown in FIG. 5, it is preferable that the collimator 160 is located at the center in the pipe 10 when inspecting the welded portion or the like.

According to the image provided by the camera 170 positioned behind the collimator 160 as described above, the worker transfers the collimator 160 to the welded portion You can position it just above it and proceed with the test. Accordingly, when inspecting a welded portion or the like in the piping 10, the accuracy of the inspection can be improved.

Hereinafter, with reference to FIG. 7 to FIG. 10C, the structure of the pipe internal transfer apparatus according to another embodiment of the present invention will be described. FIG. 7 is a side view showing a collimator portion in an internal piping device according to another embodiment of the present invention. FIG. Fig. 8 is a perspective view showing the auxiliary shield plate of Fig. 7 in an exploded manner. Fig. FIG. 9 is a view showing in detail the inside of the auxiliary shielding plate in FIG. 10A is a diagram showing an ideal path of radiation in a general collimator. 10B is a view showing a path of actual radiation in a conventional collimator in a pipeline. FIG. 10C is a view showing the path of radiation in the pipe internal transfer device for nondestructive inspection of the present invention. FIG.

First, referring to FIG. 10A, a radiation source 30 is disposed inside the collimator 160. The radiation source 30 is irradiated toward the pipe 10 at an angle of about 40 degrees in the pipe 10. [ An external shielding agent 20 made of lead is attached to the outside of the piping 10 to protect workers from the radiation irradiated from the radiation source 30.

10A shows a case where the radiation source 30 is ideally placed in the center in the collimator 160 as a point and irradiated at an angle of exactly 40 DEG. However, in practice, as shown in FIG. 10B, the radiation source 30 is not a point, and the radiation source 30 is also located somewhat apart from the center of the collimator 160.

In this case, the radiation radiated from the radiation source 30 strikes the inner wall 161 of the collimator 160, and irregular reflection occurs. Accordingly, the radiation irradiated from the radiation source 30 spreads at an angle larger than 40 degrees, and is transmitted to the portion of the outside of the pipe 10 where the external shielding agent 20 is absent. Thus, the radiation transmitted to the outside of the piping 10 without the external shielding agent 20 is a factor that threatens the safety of the operator in some form.

In order to solve such a problem, the piping inner feeder of the present embodiment includes all the structures of the piping inner feeder 100 shown in Fig. 1, and includes a first auxiliary shielding plate (not shown) fitted to the outer diameter of the collimator 160 166 and a second auxiliary shielding plate 167.

The first auxiliary shielding plate 166 is in the form of a vertical wall fitted to the outer diameter of the collimator 160 to shield one side of the collimator 160. The second auxiliary shielding plate 167 is in the form of a vertical wall fitted to the outer diameter of the collimator 160 to shield the other side of the collimator 160. The first auxiliary shielding plate 166 and the second auxiliary shielding plate 167 minimize the radiation emitted through the collimator 160 from being radiated from the external shielding agent 20 outside the piping 10, (10) Protect the safety of workers outside.

7 to 9, the first auxiliary shielding plate 166 and the second auxiliary shielding plate 167 include auxiliary covers 166d and 167d which are vertically extended by a predetermined length and are inclined outwardly do. The auxiliary covers 166d and 167d may have a disc shape.

The vertical portions of the auxiliary covers 166d and 167d allow the radiation emitted from the radiation source 30 to fall within a predetermined angular range while the inclined surfaces that are continuous with the vertical portion are irradiated with the radiation emitted from the radiation source 30 by the vertical portion Do not allow the range to become excessively narrow.

Lead shielding agents 166a, 166b, and 166c (167a, 167b, and 167c) for shielding radiation are inserted inside the auxiliary covers 166d and 167d.

The lead shielding agents 166a, 166b and 166c 167a, 167b and 167c are composed of three lead shielding agents 166a and 167a, a second lead shielding agent 166b and 167b and a third lead shielding agent 166c and 167c , And each lead shielding member 166a, 166b, 166c (167a, 167b, 167c) may have a disc shape having an opening in the center.

The first lead shielding agents 166a and 167a have a disk shape inserted into the innermost portions of the auxiliary covers 116d and 167d and the second lead shielding agents 166b and 167b are next to the first lead shielding agents 166a and 167a The first lead shielding members 166a and 167a may have a larger diameter than the first lead shielding members 166a and 167a. The third lead shielding agents 166c and 167c may be inserted after the second lead shielding agents 166b and 167b and may have a larger diameter than the second lead shielding agents 166b and 167b.

It is preferable that the diameters of the first lead shielding agents 166a and 167a to the third lead shielding agents 166c and 167c increase and the sizes of the openings formed in the respective lead shielding agents increase. This is because the diameter of the first lead shielding agent 166a, 167a, the second lead shielding agent 166b, 167b and the third lead shielding agent 166c, 167c becomes larger and the outer line is inclined, An opening is formed in a relatively less important intermediate portion, thereby reducing the overall weight and reducing the material.

10C, the radiation emitted from the radiation source 30 is reflected by the inner wall 161 of the collimator 160 and then transmitted through the first auxiliary shielding plate 166 and the second auxiliary shielding plate 167 It can be reflected to the part or inclined part so as to enter the range where the external shielding agent 20 outside the pipe 10 exists.

The radiation is sufficiently irradiated to the welded portion of the pipe 10 so as to irradiate the defect of the welded portion while minimizing the amount of the radiation radiated to the outside of the pipe 10 out of the external shielding agent 20, It is possible to protect workers working outside.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

10: Piping
100: Non-destructive testing device
101: Notebook
110:
121: rear left wheel
122: rear right wheel
130: Rotating plate
141: front left wheel
142: front right wheel
150: Container
155: Transmission pipe
160: collimator
166: first auxiliary shield plate
166a: First lead shielding agent
166b: Second lead shielding agent
166c: third lead shielding agent
166d: auxiliary cover
167: Second auxiliary shield plate
167a: First lead shielding agent
167b: Second lead shielding agent
167c: Third lead shielding agent
167d: auxiliary cover
170: camera
181: pigtail
183: Reducer
184: Motor
190: Mounting bar
195: collimator holder

Claims (3)

A non-destructive inspection apparatus capable of being transferred into a pipe,
A body on which the components are mounted;
A rear left wheel and a rear right wheel positioned rearward of the main body and driven by a motor;
A rotating plate rotatably connected to the front of the main body in the left-right direction;
A front left wheel and a front right wheel fixed to the rotating plate and projecting out of the main body;
A radiation capsule with a radiation source embedded therein;
A container for storing the radiation capsule in a shielded state;
A transfer tube connected to the container to transfer the radiation capsule;
A collimator coupled to the forward end of the transfer tube;
A radiation source transferring unit for transferring the radiation capsule between the container and the collimator through the transfer tube;
Wherein the pipeline inner conveying device for non-destructive inspection for radioactive shielding comprises: The method according to claim 1,
A first auxiliary shielding plate in the form of a vertical wall fitted to an outer diameter of the collimator and shielding one side of the collimator;
A second auxiliary shielding plate in the form of an upright wall fitted to an outer diameter of the collimator and shielding the other side of the collimator;
Further comprising: a piping inner transferring device for non-destructive inspection for radioactive shielding. 3. The method of claim 2,
Wherein the first auxiliary shielding plate and the second auxiliary shielding plate each include an auxiliary cover extending vertically by a predetermined length and inclined outwardly and a lead shielding member inserted into the auxiliary cover, Inspection pipe internal transfer device.

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