JP2959076B2 - Radiation transmission inspection method and apparatus - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiographic inspection method for inspecting an object to be inspected using radiation such as X-rays, and an apparatus therefor.

[Related Art] For example, when inspecting a welded portion between metal members (inspection objects), a radiation transmission inspection is conventionally performed.

The radiation transmission inspection device used for this radiation transmission inspection
The metal member and the unphotographed film are set on an inspection stage arranged below the X-ray irradiation port (radiation port) of the X-ray generator (radiation generator), and then the switch of the X-ray generator is set to a predetermined position. X-rays are irradiated by irradiating a welded portion of the metal member with X-rays for a certain period of time, and then the generator is turned off to collect the photographing agent film. As such a conventional radiographic inspection apparatus, For example, there are a type in which the film is put in and out of the inspection stage manually, and a type in which the film is automatically controlled using a control device.

[Problems to be Solved by the Invention] By the way, in the former manual type, it takes time to take in and out the film, so that a quick and efficient inspection cannot be performed. In addition, film taking in and out of the X-ray generator can be performed. Needed a dedicated worker.

In the latter automatic type, although the problems of the manual type can be solved to achieve some quick and efficient inspection and labor saving, the irradiation of radiation is inspected as described above. Since this is intermittent irradiation that switches the X-ray generator on and off every time the film is set on the stage, it is difficult to say that the efficiency has been sufficiently improved. Since it is necessary, there is a problem that the price becomes high.

The present invention has been made in view of the above-described circumstances, and provides a radiographic inspection method and apparatus capable of quick and efficient inspection and labor saving of workers, and requiring no control system for turning on and off radiation irradiation. To provide.

[Means for Solving the Problems] According to the radiographic inspection method of the present invention, an object to be inspected and a radiopaque film are set in a short time on an inspection stage to which radiation is continuously irradiated while an irradiation range is regulated. Then, the test object is irradiated with radiation for a predetermined time,
Next, the radiation-permeable film through which the radiation has been transmitted is recovered in a short time, and then the inspection of the inspection object is continuously performed by sequentially repeating the same operation. In the radiation irradiation direction of a radiation generator that can continuously irradiate radiation, an inspection stage where an inspection object and a radiopaque film can be set is installed, and between the radiation generator and the inspection stage,
An irradiation range regulating member that regulates the irradiation range of radiation is provided,
In the vicinity of the inspection stage, a film storage box in which a large number of the radiolucent films can be stored in a laminated state inside, and a film outlet is formed on the film unloading side, facing the inspection stage. The storage box has a film unloading unit that can collectively feed out the stored radiopaque films to the film unloading side, and a film unloading suction unit that can absorb the radiopaque films closest to the film unloading side. And a film unloading means outside the storage box capable of sequentially sucking out the non-permeable film adsorbed by the film unloading suction means from the film unloading port to the outside of the film storage box in a short time. And between the inspection stage, by the film unloading means outside the storage box A stage-direction transfer suction means capable of adsorbing the emitted radiopaque film, and a film mounting table on which the radiopaque film is mounted; and Provided is a stage direction film moving means capable of sequentially sucking and transporting the film mounting movable table on which the transparent film is sucked and supported to the inspection stage in a short time, and further in the vicinity of the inspection stage opposite to the film storage box on the opposite side. Is provided with a film collection box capable of storing a radiation-permeable film that has been subjected to radiation transmission for a predetermined period of time, and a pair of pull-in of the radiation-transparent film into the film collection box in a short time sequentially at the entrance side of the film collection box. A film retraction means is provided.

[Operation] In the radiation transmission inspection method of the present invention, the inspection object and the radiation non-transparent film are set in a short time on the inspection stage to which radiation is continuously applied in a state where the irradiation range is regulated. The inspection object is irradiated with radiation for a predetermined time, and then the radiation-permeable film through which the radiation is transmitted is recovered in a short time, and then the same operation is repeated to perform a continuous radiation inspection of the inspection object. .

In the radiographic inspection apparatus of the present invention, a large number of radiopaque films are stored in a film storage box in a stacked state in advance, and the stored radiopaque films are collectively fed to the film unloading side by the film feeding means. At the same time, the radiation generator is operated and the irradiation range is regulated by the irradiation range regulating member, and the radiation is continuously irradiated from the radiation irradiation port onto the inspection stage.

Thereafter, the radiopaque film closest to the film unloading side is sucked by the film unloading suction means, and then the radiopaque film as it is adsorbed is transferred from the film outlet through the film unloading means outside the storage box through the film unloading means. It is transported to the mounting table in a short time. At this time, the radiation non-transparent film is sucked and conveyed to a position where the end of the film in the conveying direction slightly projects from the end of the film mounting moving table on the inspection stage side.

Next, after the radiopaque film conveyed onto the film mounting moving table is sucked to the film mounting moving table by the stage direction conveying suction means, the film mounting moving table is moved to the inspection stage by the stage direction film moving means. To the inspection stage together with the inspection object set at the predetermined time, and at the same time, the transport direction of the radiation non-transparent film protruding from the end of the film mounting movable table on the inspection stage side Is inserted into the film retraction means provided at the film carry-in port of the film collection box. Next, by stopping the radiopaque film on the inspection stage for a predetermined time as it is, the radiation continuously irradiated from the radiation generator is transmitted from the inspected object to the radiopaque film for a predetermined time. A radiation transmitting film is obtained, and thereafter, the film retracting means is operated to collect the radiation transmitting film into the film collecting box in a short time.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a radiation transmission inspection apparatus according to an embodiment of the present invention includes an X-ray irradiator (radiation irradiator) having an X-ray irradiator (radiation irradiator) 1 to which X-rays (radiation) are radiated downward. Device 2 is provided below the X-ray irradiator 1 of the X-ray irradiator 2 and is a lead-made trumpet-shaped irradiation tube (irradiation range regulation) for limiting the irradiation range and preventing X-ray scattering. A member 3 is disposed, and a step motor 7 for rotation is disposed on an inspection stage 4 disposed below the irradiation tube 3. The step motor 7 welds, for example, end faces of a pair of large-diameter rings. The inspected object 5 can be rotated by a predetermined pitch via the axis 6.

A non-transmissive film (radiation non-transmissive film) F1 in which a large number of X-rays are not transmitted is stored in a stacked state in one of the axial directions of the inspection object 5 and near the inspection stage 4. A storage box (film storage box) 8 having an openable and closable dark curtain (lid member) 10 is disposed at a film outlet 9 formed on the film discharge side 8a, and is formed on the bottom surface of the storage box 8. Through hole
A rod 14 fixed to an elevating plate 13 having a base portion slidably fitted inside a driving cylinder 12 disposed outside and having a non-transmissive film F1 mounted on a tip thereof, is inserted into the driving cylinder 12 so as to be vertically movable. The film feeding device (film feeding means) 15 is constituted by the cylinder 12 and the rod 14. At predetermined positions in the height direction in the storage box 8, there are provided stopper plates 16 which are fixed to both inner side surfaces and regulate the pushing up by the film feeding device 15 for the laminated radiopaque film.

Further, a through-hole 17 formed on the rear surface of the storage box 8 corresponding to the film outlet 9 and substantially at the same height as the film outlet 9 is provided with a driving cylinder 18 disposed outside. A rod 19 that is slidably mounted and whose tip is movable through the film outlet 9 to the vicinity of the inspection stage 4 is inserted so as to be able to move forward and backward. A suction device (film discharging suction means) 21 having a cylinder 21a for raising and lowering the suction cup 20 is attached, and a film unloading device (film discharging means outside the storage box) 22 is provided by the cylinder 18, the rod 19 and the suction device 21. Is configured.

Between the storage box 8 and the inspection stage 4, there is provided a suction device (stage-direction transfer suction means) 24 having a suction cup 23 at an end portion on the storage box 8 side, and a motor (not shown) is provided on the inspection stage 4 side. A film moving table 26 whose tip can pass freely under the inspection unit of the inspection object 5 and can be freely moved to the vicinity of a film pull-in roller 25 to be described later is arranged. A moving device (film moving means) 27 is configured.

A collection box (film collection box) provided with a film guide tube 29 having a trumpet-shaped side surface and a rectangular planar shape on the film carrying side 28a near the side opposite to the storage box 8 with respect to the inspection stage 4. A pair of upper and lower film draw-in rollers 25 are drivably provided at the tip of the film guide tube 29 of the collection box 28, and a film guide tube 29 is provided at the upper film loading side 28a inside the box 28. A film feeder 34 that feeds the transparent film F2 conveyed from the inside into a film storage chamber 30 partitioned at the lower part in the box 28 is stored. The film feeder 34 includes at least two rollers 31 that can be driven, an endless belt 32 wound around the rollers 31, and a roller 33 that contacts the belt 32.
The film can be fed into the film storage chamber 30 by being sandwiched between the roller 32 and the roller 33.

In the figure, F1 ′ is the end of the non-permeable film F1 in the transport direction, 26
a is an end of the film moving table 26 on the inspection stage 4 side, and 29a is an entrance of the collection box 28.

Next, the operation of the radiation transmission inspection apparatus according to the embodiment of the present invention will be described.

In the radiation transmission inspection apparatus according to the embodiment of the present invention, as shown in FIG. 1, a large number of opaque films F1 are previously stored in a stacked state on the elevating plate 13 in the storage box 8, and the stored opaque films F1 are stored. F1 film feeding device 15 cylinder
The rod 14 is raised by operating the rod 12, the uppermost opaque film F1 is lightly applied to the stopper plate 16 and positioned, and the rod 19 of the cylinder 18 is advanced to move the suction cup 20 of the suction device 21 to the uppermost opaque film. The film F1 is stopped above the leading end of the film outlet 9 side, the inspection object 5 is set on the inspection stage 4, and the axis 6 is connected to the step motor 7. In this state, the X-ray generator 2 is operated to control the irradiation range by the irradiation tube 3, and X-ray irradiation is started from the X-ray irradiation port 1 onto the inspection object 5 of the inspection stage 4. Turn the drive switch not on.

After that, the film discharge side 8a of the uppermost non-permeable film F1 is sucked by lowering the suction cup 20 of the suction device 21, and then the suction cup 20 is raised to move the sucked non-permeable film F1 to the film outlet 9 position. Raising and removing film
When the cylinder 18 of 22 is actuated to move the rod 19 horizontally in the direction of the inspection stage 4, the tip of the rod 19 holding the non-permeable film F1 is pushed open the blackout curtain 10, and the non-permeable film F1 is unloaded from the film outlet. 9 to the film transfer table 26 in a short time in about one second.

At this time, the non-transparent film F1 is sucked and conveyed to a position where the end F1 'of the film F1 in the conveying direction slightly protrudes from the end 26a of the film moving table 26 on the inspection stage 4 side toward the inspection stage 4. You.

Next, the suction of the suction cup 20 of the suction device 21 is released, and the non-permeable film F1 is moved to the film moving table 26 of the film moving device 27.
After the non-permeable film F1 placed on the film transfer table 26 and conveyed onto the film transfer table 26 is sucked onto the film transfer table 26 by the suction cup 23 of the suction device 24, the film is moved by driving a motor (not shown) of the film transfer device 27. The table 26 is set under the inspection position of the inspection object 5 set on the inspection stage 4 in advance in a short time of about 1 second. In addition, at the same time, the end F1 'of the non-permeable film F1 protruding from the end 26a of the film moving table 26 on the inspection stage 4 side in the transport direction is moved to the collection box 28.
Film draw-in roller 25 provided in the film guide cylinder 29
Between the rollers.

In this state, the non-transparent film F1 is left on the inspection stage 4 for a predetermined time period of about 60 seconds, so that the X-rays continuously irradiated from the X-ray generator 2 can be transmitted from the inspection object 5 to the non-transparent film. A transmission film F2 in which the state of the welded portion has been transmitted to F1 is obtained, and then the suction device 24 is released, the suction cup 23 is separated from the lower surface of the transmission film F2, and the film retracting roller 25 and the film feeding device 34 are moved. When activated, the permeable film F2 is collected into the film storage chamber 30 of the collection box 28 in a short time of about 2 seconds.

On the other hand, in the storage box 8, by the suction cup of the suction device 21,
The uppermost opaque film F1 is adsorbed and the film transfer platform
While being transported to 26, the elevating plate 13 is raised by the film feeding device 15, and the uppermost opaque film F1 is lightly brought into contact with the stopper plate 16 in advance.

When the non-permeable film F1 is transferred from the suction cup 20 of the suction device 21 to the film transfer table 26 of the film transfer device 27, the suction device 21 returns to the original position via the rod 19 by the cylinder 18, and the film unloading device 22 Cylinder 21a and suction cup 2
0 stands by in the storage box 8. When the cylinder 21a and the suction cup 20 return into the storage box 8, the blackout curtain 10 is closed by its own weight or the force of a spring (not shown).

Further, when the transmission film F2 starts to be sent to the film guide cylinder 29 side by the film draw-in roller 25, the film moving table 26 is reversely fed, retreats backward from under the inspection object 5, returns to the storage box 8, and returns to the storage box 8 side. The pull-in roller 25 stops.

Next, the stepping motor 7 is driven to rotate the inspection object 5 to move the next inspection point to a position below the X-ray irradiation port 1 of the X-ray irradiation device 2, and the above-described operation is sequentially repeated.

In this manner, the inspection object 5 and the non-transparent film F1 are set in a short time on the inspection stage 4 to which the X-ray is continuously irradiated from the X-ray irradiator 2 in a state where the irradiation range is regulated by the irradiation tube 3. Then, X-rays are irradiated to the inspection object 5 for a predetermined time, and then the transmission film F2 through which the X-rays are transmitted is recovered in a short time, and then the same operation is sequentially repeated to continuously inspect the inspection object 5. Since the radiographic inspection of No. 5 is performed, time and labor for inserting and removing the non-transmissive film F1 and the transmissive film F2 and turning on and off the X-ray are not required, and the inspection can be performed quickly and efficiently, and labor can be saved. In addition, since the X-rays are continuously emitted as described above, a control system for turning on and off the X-ray irradiation is not required, and the cost is reduced.

Even if the films F1 and F2 are taken in and out under the continuously irradiated X-rays, the irradiation range is regulated by the irradiation tube 3, and the normal X-ray transmission time to the non-transparent film F1 (60 seconds) In order to move the film F1 and F2 in and out in a short time (4 seconds in total), the transmission film F2 obtained only with the light intensity (X-ray irradiation energy) during the normal X-ray transmission time
The film density a shown in FIG. 2 and the film density b shown in FIG. 2 of the transmission film F2 obtained by the amount of light during the X-ray transmission time including the in-out time of the films F1 and F2 shown in FIG.
Since the difference between the density and the density is insignificant, there is no influence on the judgment of the quality of the welded portion of the inspection object 5 from the image of the transmission film F2.

Hereinafter, the embodiment of the present invention has been described. However, the present invention is not limited to this embodiment, and includes changes in the configuration and operation within a scope not departing from the gist of the present invention.

For example, in the embodiment, the X-ray generator is shown as the radiation generator, but the radiation generator is not necessarily limited to this, and may be another radiation generator.

In the embodiment, the irradiation tube is shown as the irradiation range regulating member. However, the present invention is not limited thereto. For example, a shielding box, which is disposed between a radiation generator and an inspection stage and is made of a material capable of shielding radiation, Etc. can also be used.

Furthermore, although a blackout curtain was used as the lid member, other lid members such as a lid plate that can be opened and closed with a hinge or the like can be used without being limited to this.

Furthermore, in this example, the normal radiation transmission time into the non-radiation permeable film was 60 seconds, while the total in / out time of the film was 4 seconds. However, it is not always necessary to limit to these times. It can be set arbitrarily within a range that only influences the quality of the inspection object with respect to the film.

Furthermore, in this embodiment, the inspection object is set on the inspection stage in advance. However, the present invention is not limited to this. For example, the inspection object can be set almost simultaneously with the movement of the radiopaque film to the inspection stage.

Furthermore, in this embodiment, after the radiation transmissive film is obtained, the same inspection object is rotated to move the inspection position, but the inspection object does not necessarily need to be moved to another inspection object. The next inspection can be performed instead.

[Effects of the Invention] In the radiographic inspection method and apparatus according to the present invention, in any case, it is possible to quickly and efficiently perform inspection and save labor by saving time and labor for taking in and out of the film. Further, since the radiation is continuously irradiated, an effect that a control system for turning on / off the radiation irradiation is unnecessary and the price is reduced can be obtained.

Further, the radiation transmission inspection apparatus has an effect that a radiation transmission inspection method having the above effects can be realized.

[Brief description of the drawings]

FIG. 1 is an overall schematic side view of a radiation transmission inspection apparatus according to an embodiment of the present invention, and FIG. 2 is a view illustrating a radiation transmission film when a transmission inspection is performed using the radiation transmission inspection apparatus according to the embodiment of the present invention. It is a graph which shows a degree of influence. In the figure, F1 is a non-transparent film (radiation non-transparent film),
F2 is a transmission film (radiation transmission film), 1 is an X-ray irradiation port (radiation irradiation port), 2 is an X-ray irradiation device (radiation irradiation device), 3 is an irradiation cylinder (irradiation range regulating member), 4 is an inspection stage, 5 is an inspection object, 8 is a storage box (film storage box), 8a is a film discharge side, 9 is a film discharge port, 10 is a blackout curtain (lid member), 15 is a film feeding device (film feeding means), and 21 is suction. Device (suction means for unloading the film), 22 is a film unloading device (means for unloading the film outside the storage box), 24 is a suction device (suction means for conveying in the direction of the stage), 25 is a film draw-in roller, and 26 is a film moving table (film mounting means). And 27, a film transfer device (film transfer means); 28, a collection box (film collection box); 28a, a film loading side; and 29a, an entrance.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-282251 (JP, A) JP-A-61-282239 (JP, A) JP-A-60-78776 (JP, A) 41829 (JP, U) Japanese Utility Model Showa 54-5432 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01B 15/00-15/08 G01N 23/00-23/227 G03B 42/00-42/08

Claims (2)

(57) [Claims] An inspection object and a radiopaque film are set in a short time on an inspection stage to which radiation is continuously irradiated in a state where an irradiation range is regulated, and then the inspection object is irradiated with radiation for a predetermined time. A radiation transmission inspection method comprising: irradiating, then collecting a radiation-permeable film through which radiation has passed, in a short period of time, and then successively inspecting the inspection object by repeating the same operation. 2. An inspection stage on which an object to be inspected and a radiopaque film can be set in a radiation irradiation direction of a radiation generator capable of continuously irradiating radiation, and an inspection stage between the radiation generator and the inspection stage is provided. An irradiation range regulating member for regulating the irradiation range of the radiation is provided between them, and in the vicinity of the inspection stage, a large number of the radiation non-transparent films can be housed in a stacked state inside, and a film discharge port is provided on the film discharge side. Provide a film storage box formed facing the inspection stage, the film storage box,
A film unloading unit that can collectively feed out the stored radiopaque film to the film unloading side, and a film unloading suction unit that can absorb the radiopaque film closest to the film unloading side, and the film A storage box outside film unloading means capable of sequentially sucking out the non-permeable film sucked by the unloading suction means from the film unloading port to the outside of the film storage box in a short time is further provided, and the film storage box and the inspection stage are further provided. And a stage-direction transport suction means capable of suctioning the radiopaque film unloaded by the storage box film unloading means, and a film mounting table on which the radiopaque film is mounted. And the radiation opaque film is sucked by the suction means for the stage direction transfer, A stage direction film moving means capable of sequentially sucking and transporting the held film mounting table to the inspection stage in a short time is provided, and further, in the vicinity of the inspection stage on the opposite side to the film storage box, for a predetermined time, A film collection box capable of storing the radiation-permeable film whose radiation has been transmitted is provided, and a pair of film pull-in means for sequentially drawing the radiation-permeable film into the film collection box in a short time is provided at the entrance side of the film collection box. A radiographic inspection apparatus characterized by being performed.