KR101602774B1 - radiography apparatus for welding part - Google Patents

Abstract

The present invention relates to a radiography (γ-ray) photographing apparatus for a welding portion, and more particularly, to a radiography (γ-ray) photographing apparatus which is configured to irradiate a welding portion while moving along a welding portion on a welding portion of an H- ≪ / RTI > A γ-ray imaging apparatus for welding a weld according to the present invention comprises a gamma ray irradiator for storing a radiation source, a tungsten collimator for receiving the radiation source from the gamma ray irradiator, and a collimator for collimating the tungsten collimator And a cart which moves along the weld while supporting the gamma ray irradiator and the collimator at a constant height. The cart includes a top plate for supporting the gamma ray irradiator and the collimator shield, a plurality of side shielding plates extending downward from the top plate, and a plurality of wheels fixedly supported by a part of the side shielding plate.

Description

Technical Field [0001] The present invention relates to a radiography apparatus for welding part,

The present invention relates to a radiographic (gamma-ray) imaging apparatus for H-BEAM welding, and more particularly, to a radiography apparatus for H-BEAM welded portion, which is configured to irradiate a welded portion while moving along a welded portion of the H- Ray (? -Ray) photographing apparatus.

In general, nuclei are made up of protons and neutrons. When a proton and a neutron are combined to form an atomic nucleus, a stable atomic nucleus is formed and an unstable atomic nucleus is formed by the ratio of protons and neutrons. Unstable nuclei are converted to stable nuclei by bringing together two protons and two neutrons, alpha particles, electrons, gamma rays, X-rays and neutrons. Radiation is the alpha, electron, gamma ray, X-ray, and neutron emitted when a nucleus changes to another nucleus. Radiation is much more dangerous because it is more energetic than the electromagnetic waves emitted by electrons circling around the nucleus.

Such radiation is harmful to the human body, but it can penetrate a large part of the object because of strong energy, and is widely used in medical fields for diagnosing patients and non-destructive inspection in industrial fields.

Steel H-beams and other products are welded and welded together during the production. Since the accurate state can not be grasped by observing only the state of appearance of the welded part, it is necessary to grasp the welding state inside the welded part. In order to determine the overall state of the welded portion, a radiographic inspection (gamma-ray) imaging device is used.

Radiographic (γ-ray) in the image pickup apparatus is used a collision meta, meta coli as a prior art related to the Republic of Korea Patent Application Registration No. 10-0434579 call the meta coli using a radiation property isotopes (Ir-192) A lead connector having an insertion port formed therein for wrapping the collimator, a guide connector for connecting a radiometric element to one side of the lead molding to inject collimator therein, and a housing surrounding the outer periphery of the lead molding, And a handle formed on an upper portion of the house to shield the radiation emitted from the collimator. The home collimator using the radioactive isotope is disclosed. The collimator is formed of a tungsten material, and the radioisotope is induced along the inner passage to be radiated to the outside, and is passed through the welded portion to measure the integrity of the welded portion.

However, the above-described conventional radiography (gamma-ray) photographing apparatus requires the collimator to be fixed in one place, and then the collimator is directly transferred to the next position after the collimator is fixed, There is a long time problem. In addition, if the operator transports the collimator without proper transportation support, it can not satisfy the newly revised Nuclear Safety Act enforcement regulations and can not work at all.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a H-beam steel plate welded part of a steel frame, Ray imaging apparatus which can be constructed in accordance with the new regulations so as to be able to radiate the radiation.

As a specific means for achieving the above object, the present invention provides a gamma ray irradiation apparatus comprising: a gamma ray irradiator for storing a radiation source; A collimator which receives the radiation source from the gamma ray irradiator; A collimator shield installed to surround the collimator; And a cart moving along the weld while supporting the gamma ray irradiator and the collimator at a constant height, the cart comprising: an upper plate supporting the gamma ray irradiator and the collimator; A plurality of side shielding plates extending downward from the upper plate; And a plurality of wheels supported and fixed to a part of the side shield plate.

Preferably, the side shielding plate is provided with a scale.

Preferably, the wheel is supported by a bracket, and the bracket has an assembling block having a plurality of assembling holes in which the brackets are assembled so as to adjust the height of the brackets with respect to the side shielding plate.

Preferably, the cart upper plate is provided with a railing having a rim extending upward.

Preferably, the collimator is made of tungsten.

Preferably, the guide tube connecting the collimator and the gamma ray irradiator and guiding the radiation source is made of polyurethane.

The present invention as described above has the following effects.

(1) Since a collimator and a gamma ray irradiator are installed together on a cart, and a radiation is irradiated to the welding portion, the apparatus for photographing a radiation-penetration inspection (gamma-ray) according to the present invention can rapidly and continuously photograph the weld Provides an effect.

(2) Since the radiographic inspection (γ-ray) photographing apparatus according to the present invention uses a cart composed of a shielding plate composed of an upper plate and a side plate, it is possible to sufficiently satisfy the criteria set by the Nuclear Safety Act .

(3) The welding unit according to the present invention can be directly inspected in the field without moving the inspection subject to another space after the welding process is completed, thereby providing a great effect for rapid process control.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a radiation-transmission inspection (γ-ray) photographing apparatus according to the present invention.
Fig. 2 is an enlarged view of a collimator part of a radiographic (gamma-ray) photographing apparatus according to the present invention.
FIG. 3 is an exploded perspective view of a collimator, a guide connector, and a guide tube, which are components of a radiography (gamma-ray) photographing apparatus according to the present invention.
4 is a cross-sectional view showing the operation of a radiation-transmission inspection (gamma-ray) photographing apparatus according to the present invention.

The above objects, features and advantages of the present invention will become more apparent from the following detailed description. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, a welding portion radiography apparatus 1 according to a preferred embodiment of the present invention includes a gamma ray irradiator 20 for storing a radiation source, a collier receiving the radiation source from the gamma ray irradiator 20, A collimator shield 30 installed to enclose the collimator 33 and a collimator 33 for supporting the gamma ray irradiator 20 and the collimator 33 at a constant height, And a moving cart 40.

The cart 40 includes an upper plate 41 supporting the gamma ray irradiator 20 and the collimator 33, a plurality of side shielding plates 42 extending downward from the upper plate 41, And a plurality of wheels 43 supported and fixed to a part of the side shielding plate 42.

The side shielding plate 42 is provided with a scale 42a.

The wheel 43 is supported by a bracket 45 and the bracket 45 includes a plurality of assembling holes 45 for fitting the bracket 45 to adjust the height of the bracket 45 relative to the side shielding plate 42. [ Is provided with an assembly base (44).

The upper plate 41 of the cart 40 is provided with a railing 41b having a rim extending upward.

The collimator 33 is made of tungsten.

The guide tube 21 connecting the collimator 33 and the gamma ray irradiator 20 and guiding the radiation source is made of polyurethane.

Referring to Fig. 1, there is shown a radiography (gamma-ray) photographing apparatus 1 of a welding portion according to the present invention. In the photographing apparatus 1, the collimator shield 30 and the gamma ray irradiator 20 are seated on the upper surface of the cart 40, unlike the four wheels 43.

The gamma ray irradiator 20 is connected to a remote control device 10 so as to adjust the radiation source. In the operation tube 20, the cable connected to the radiation source is adjusted to adjust the position of the radiation source.

The cart 40 is provided with four wheels 43 at the lower end thereof and is capable of being transported from the floor to all directions. And the shield plate 42 is provided extending from the upper surface of the cart 40 to four sides in the downward direction. In the portion for measurement, a scale 42a is engraved so that the length of the object under the shield plate 42 can be intuitively measured.

The cart shielding plate 42 is provided with a handle 42b so that the user can easily operate the cart shielding plate 42.

The wheel 43 is provided to adjust the height of each wheel as described above.

A horizontal top plate 41 is provided at the upper end of the shield plate 42 to support the gamma ray irradiator 20 and the collimator shield 33.

2, the cart 40 and a part of the collimator shield 30 are cut out and enlarged. Referring to the enlarged view, a tungsten collimator 33 is installed inside the collimator shield 30, and is connected to the hollow connecting bolt 34.

The hollow connection bolt 34 is connected to the guide tube 21 of the gamma ray irradiator 20. Therefore, the radiation source is adjusted in the order of the guide tube 21, the hollow connecting bolt 34, and the collimator 33 in the forward and backward directions in accordance with the operation of the remote control device 10 and the supply and return from the gamma ray irradiator 20 .

The collimator 33 is made of tungsten which is light and has excellent shielding performance.

The guide tube 21 is made of polyurethane capable of shielding 50% of the radiation, and the length of the guide tube 21 is less than 10 cm, so that the exposure time in the guide tube 21 of the radiation source is minimized.

The collimator shield 30 for storing the collimator 33 is manufactured using a 3 mm steel plate 31 on the outer surface and the lead 32 is used for the rest. The outer surface of the shield 30 is formed of a 3 mm steel plate as described above, and is installed so as to enclose the lead 6 so as to cover all the top, bottom, left, and right sides.

Of course, the shield 30 is provided with an irradiation hole at the lower portion thereof in the same position as the tungsten collimator 33 so as to irradiate the radiation downward. It goes without saying that the irradiation hole 41a is provided in the upper plate 41 as well.

Referring to FIG. 3, the connection structure of the tungsten collimator 33 and the gamma ray irradiator 20 is well illustrated. A hollow connecting bolt 34 is connected to one end of a tungsten collimator 33 installed inside the shield 30 and one end of a guide tube 21 is connected to the other end of the hollow connecting bolt 34. Finally, a gamma ray irradiator 20 is connected to the other end of the guide tube 21 to complete a passage through which the radiation source is moved.

Therefore, since the radiation source moves only along the above-described path, the amount of radiation radiated to the outside is limited.

Referring to Fig. 4, the operation of the radiation ray-transmittance inspection (gamma-ray) photographing apparatus 1 according to the present invention is well illustrated. As shown, the cart 40 is transported along the weld 101 of the steel H-beam. Before the work, the film 200 is provided on the opposite side of the welding portion 101. Then, the remote control device 10 connected to the gamma ray irradiator 20 is operated to transfer the radiation source to the collimator 33.

Then, the radiation source is irradiated to the lower part of the collimator 33, and the welding part 101 is photographed and displayed on the film 200 as an image. The operator continuously performs the photographing of the welding portion 101 while moving the cart 40 along the welding portion 101 using the handle 42b.

When the photographing is completed, the remote control device is operated to recover the radiation source to the gamma ray irradiator 20.

When the radiation source is inside the gamma ray irradiator 20, the radiation is almost completely shielded from the outside. Therefore, when the radiation source is transferred to the collimator 33, some radiation may be irradiated from the guide tube 21, Since it moves to the collimator 33, the exposure time is small and the emission radiation is also small.

Therefore, even when the collimator 33 irradiates the radiation, the amount of radiation radiated to the outside by the top plate 41 and the shielding plate 42 is limited.

The upper plate 41 is made of an iron plate and the lead plate, and the shield plate 42 is made of a lead plate.

Since the cart 40 is provided with the wheels 43, the cart 40 can be stably moved, so that continuous and rapid shooting is possible. Particularly, since the wheel 43 is supported by the bracket 45 and the bracket 45 is assembled by inserting a bolt into an assembly hole of the assembly table 44, the height of the wheel 43 can be adjusted according to circumstances It is very convenient.

According to the current Nuclear Safety Regulations, "When a radiation work is not carried out in a fixed radiation shielding facility, the workplace is controlled for the area where the external radiation dose rate exceeds 10 μSv per hour, and the area exceeding 1 μSv per hour To monitor the public's access to "

Therefore, the steel frame H-beam fabrication requires a shielding device capable of shielding the monitored dose to work in a factory, shop or field. The present invention is a radiographic inspection (gamma-ray) photographing apparatus having a shielding function capable of satisfying all of these requirements.

The thickness of the parts to be applied in the photographing apparatus according to the present invention is calculated by a shielding expression expressed by the following equation (1).

The shielding matters and numerical values in the above formula are as follows.

Accordingly, when the image pickup apparatus according to the present invention is used, the monitoring dose does not exceed 1 mu Sv / hr within 3 m.

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 or scope of the inventions. It will be apparent to those of ordinary skill in the art.

1: Welding section radiography apparatus
10: remote control device 20: gamma ray irradiator
21: guide tube 30: collimator shield
33: tungsten collimator 40: cart
41: upper plate 42: side shield plate
43: wheel 101: welded part
200: film

Claims (6)

1. An HIS specimen irradiating apparatus for irradiating a HIS beam, comprising:
A gamma ray irradiator for storing the radiation source;
A collimator which receives the radiation source from the gamma ray irradiator;
A collimator shield installed to surround the collimator; And
A cart moving along the weld while supporting the gamma ray irradiator and the collimator at a constant height;
A guide tube connecting the collimator and the gamma ray irradiator to guide the radiation source; And
A hollow connecting bolt having one end connected to the collimator and the other end connected to the guide tube to guide movement of the radiation source;
Lt; / RTI >
Wherein the cart includes:
An upper plate for supporting the gamma ray irradiator and the collimator;
A plurality of side shielding plates extending downward from the upper plate to shield radiation radiated laterally; And
A plurality of wheels supported and fixed to a part of the side shield plate;
/ RTI >
A scale is provided at the lower end of the side shield plate,
Wherein the cart upper plate is provided with a railing having a rim extending upward. delete The method according to claim 1,
Wherein the wheel is supported by a bracket and the bracket is provided with an assembling block having a plurality of assembling holes in which the bracket is assembled so as to adjust the height of the bracket with respect to the side shielding plate. Shooting device. delete The method according to claim 1,
Wherein the collimator is made of tungsten. The method according to claim 1,
Wherein the guide tube connecting the collimator and the gamma ray irradiator and guiding the radiation source is made of polyurethane.

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