JPS6234292Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention mainly relates to improvements in an X-ray fluoroscopic inspection device used to inspect internal defects in industrial products made of metal.

(Prior Art) A conventional X-ray fluoroscope will be explained based on FIGS. 5 and 6.

1 is an X-ray tube and container (hereinafter referred to as an X-ray tube), 2
is an X-ray fluorescence multiplier tube television camera (hereinafter referred to as television camera), and both are provided at appropriate positions on the upper part of the base 51. A motor 52 is provided on one side of the base 51, and a shaft 52a of this motor 52
A drive shaft 53 attached to the drive shaft 53 is provided horizontally in the longitudinal direction of the base 51, and is rotatably supported by a support member 54 provided at the other end of the base 51. A pair of rails 55, 55' are provided on the upper surface of the base 51 in the longitudinal direction, and rollers 5 rolling on the rails 55, 55', respectively.
Mounting base 56 with 7, 57 and 57', 57'
is engaged with the drive shaft 53, and as the drive shaft 53 rotates, the mounting base 56 is moved against the rails 55, 5.
5' in the longitudinal direction of the base 51. A pair of rollers 58 , 58 are rotatably provided on the upper surface of the mount 56 at right angles to the longitudinal direction of the base 51 .

In the above device, the object W to be inspected is the roller 5
8, 58, and is irradiated with X-rays. In this case, the intensity of the irradiated X-rays is appropriately adjusted depending on the size of the object, the X-ray absorption rate, etc., and adjusted so that transmitted X-rays of appropriate intensity reach the television camera.

However, there is a limit to the adjustment width, and if the object to be inspected is extremely thin or has a through hole, X-rays exceeding the allowable limit may reach the TV camera and appear on the screen. This may cause halation and reduce inspection accuracy, such as overlooking internal defects. Therefore, in this case, a mask plate for preventing halation is placed in front of the television camera to prevent the occurrence of halation.

(Problem to be solved by the invention) In the case of the conventional device, when the object to be inspected is larger than the X-ray irradiation area, the object to be inspected is moved to the roller 5.
8 and 58, and performs the fluoroscopy work while changing the irradiation area as appropriate. In this case, if the thickness of the object to be inspected changes for each irradiation area, the thickness of the anti-halation mask plate must be changed for each area of the object to be inspected. Therefore, improvement in inspection work efficiency has been hindered.

Therefore, the present invention aims to provide an X-ray fluoroscopic inspection apparatus that does not require replacing the anti-halation mask every time even if the thickness of the object to be inspected varies from part to part.

(Means for Solving the Problems) The above-mentioned X-ray fluoroscopic inspection apparatus is realized by the following configuration.

That is, the X-ray fluoroscopic inspection apparatus of the present invention includes an attachment that holds an object to be inspected and a drive mechanism that moves the attachment in a predetermined direction. The object to be inspected is attached to the attachment via an attachment jig, the attachment jig is removable from the attachment, and the object to be inspected moves integrally with the attachment jig.

Here, the mounting jig is attached to the positioning means of the object to be inspected and
It has an X-ray transmittance distribution that does not cause halation in a radiation imaging device.

(Function) According to the above configuration, when the object to be inspected is attached to the attachment jig, excessive X-rays do not pass through any measurement location, and no halation occurs. Specifically, for example, when an object to be inspected is attached to a mounting jig in a predetermined positional relationship, the wall thickness of the mounting jig at the position corresponding to the thinner part of the object to be inspected is configured to be relatively thicker. If so, excessively intense X-rays will not be transmitted, thereby preventing halation from occurring in the X-ray imaging device. Alternatively, the same effect can be obtained by forming the portion of the mounting jig corresponding to the thin walled portion of the object to be inspected from a material with high X-ray absorption rate, such as a lead alloy.

Moreover, since the object to be inspected moves together with the mounting jig, the occurrence of halation is naturally prevented at all times. There is no need to replace the anti-halation mask every time the inspection area is moved, as is the case in the past.

In addition, when inspecting products with different shapes, prepare a mounting jig that matches the shape of the object to be inspected.
Just replace the mounting jig. At this time, according to the present invention, since the mounting jig is detachable from the attachment, it can be easily replaced.

(Embodiment) Next, the configuration of an embodiment of the present invention will be described based on FIGS. 1 to 4.

In the figure, a bracket 4 is attached to the upper part of one side of the frame 3a of the main body 3 of the X-ray fluoroscopic inspection apparatus.
The X-ray tube 1 is supported by this bracket 4. A deceleration device 5 is installed below and outside the X-ray tube 1, and this deceleration device 5
A reversible motor 6 is attached below. A V-belt 9 is hung between a V-pulley 7 attached to a laterally protruding shaft of the speed reducer 5 and a V-pulley 8 attached to the shaft of the reversible motor 6. The speed reducer 5 is provided with a driven shaft 5a facing toward the front in FIG. 1, and a drive sprocket 10 is attached to the driven shaft 5a. Further, a driving sprocket 10 is attached to the frame 3a.
A driven sprocket 11 is rotatably supported on the opposite side, and a chain 12 is suspended between both sprockets 10 and 11. This chain 12 is supported substantially horizontally by a U-shaped support member 13 attached to a front plate 3b provided on the front surface of the main body 3 of the apparatus. An upper rail 14 and a lower rail 15 are attached to the front plate 3b above the support member 13 and below the support member 13, respectively, in parallel with the support member 13. The mounting base 16 is supported by both rail members 14 and 15, and both ends of the chain 12 are attached. Then, when the chain 12 is operated by the speed reducer 5, the mounting base 16 is attached to the support member 13.
The front surface of the device main body 3 can be moved horizontally along. A motor support stand 17 is attached to the front of the mounting stand 16, and this motor support stand 1
An inspection object rotation motor 18 is attached to 7 in a suspended manner. Then, the inspection object rotating motor 18
Bevel gear 1 is attached to the motor shaft that protrudes upward from the
9 is installed. The motor support stand 17 has
A gear shaft 20 is rotatably mounted with its upper part tilted forward, and a bevel gear 21 is mounted on the lower end of the gear shaft 20, and a bevel gear 22 is mounted on the upper end of the gear shaft 20. The bevel gear 21 at the lower end of the gear shaft 20 is engaged with the bevel gear 19 of the inspection object rotating motor 18 . The motor support base 17 has a cylindrical bearing member 23 above the upper bevel gear 22 of the gear shaft 20.
is installed. The rotating member 24 has a disk 25
A round bar-shaped protrusion 25a is provided at the center of the upper surface of the disk 25, and a gear shaft 26 is protruded from the center of the lower surface of the disk 25 (see FIG. 3). The rotating member 24 has a positioning pin 27 implanted on the upper surface of the disc 25 outside the protrusion 25a. The rotating member 24 has a gear shaft 26 rotatably supported by a bearing member 23 with the disc 25 held horizontally. A bevel gear 28 that meshes with the upper bevel gear 22 of the gear shaft 20 is attached to the lower end of the gear shaft 26 of the rotating member 24 .

The test object mounting jig 29 has a disk shape corresponding to the test object W, as shown in FIGS. 1, 2, and 4, and is manufactured from the same material as the test object W. There is. This test object mounting jig 29 is also used as a halation prevention mask, and has a center hole 29a in its center.
A positioning hole 30 is bored into which the positioning pin 27 is fitted. The inspection object mounting jig 29 is located outside the positioning hole 30, that is, at the center O of the center hole 29a.
Four test object fixing pins 31 are installed on a circle having a radius larger than the positioning hole 30 with the center at . Further, the test object mounting jig 29 is provided with an appropriate number of through holes 32 on the outside of the test object fixing pin 31.

Test object mounting jig 29 formed as described above
connects the center hole 29a with the protrusion 25 of the rotating member 24.
a, and the positioning hole 30 is inserted into the rotating member 2.
The rotating member 24 is fitted onto the positioning pin 27 of 4.
Fixed. In this way, the inspected object W is attached to the upper surface of the inspected object mounting jig 29 attached to the apparatus main body 3. In this case, the rotating member 24 is attached to the center hole W1 of the inspected object W. protrusion 25a of
are fitted into the four bolt holes W2 of the object W to be inspected.
is the test object fixing pin 3 of the test object mounting jig 29.
1 is fitted, and the inspected object W is fixed to the inspected object mounting jig 29.

Here, the inspection object mounting jig 29 can attach an automobile disk wheel, which is the inspection object of this embodiment, and the through hole 32 is connected to the thick part of the inspection object W and the solid body. By installing the parts so that they correspond to the hole parts (or thin parts) of the object W to be inspected, it is possible to prevent halation from occurring at the hole parts made in the disk wheel during X-ray inspection. It's summery.

The X-ray fluorescence multiplier tube television camera 2 is connected to the device main body 3
The X-ray tube is attached to a mounting frame 33 provided in front of the X-ray tube in the direction of the X-ray tube.

Next, the operation of this embodiment will be explained.

When the mounting base 16 is at the start position, the test object W is mounted on the test object mounting jig 29 attached to the rotating member 24. Next, the reversible motor 6 is started, and its rotation is reduced by the reduction gear device 5 to rotate the drive sprocket 10. When the drive sprocket 10 rotates, the chain 12 is actuated, so that the mounts 16 attached to both ends of the chain 12 run along the upper and lower rails 14 and 15. When the mount 16 reaches the inspection position (first inspection position), the reversible motor 6 is stopped by the action of a limit switch or the like, and the mount 16 is also stopped at the same time. At the same time as the mount 16 stops, preset tube current and tube voltage are applied to the X-ray tube 1.
Next, when a signal to start the inspection is sent and the inspected object rotating motor 18 is started, the rotating member 24 rotates.
The test object mounting jig 29 attached to this rotating member 24 rotates. As a result, the inspected object W attached to the inspected object mounting jig 29 starts rotating integrally with the inspected object attaching jig 29. Since the inspection object mounting jig 29 also serves as a halation prevention mask, the X-rays generated by the X-ray tube 1 while the inspection object W is rotating are transmitted through the inspection object W and then attached to the inspection object W.
The image is received by the television camera 2 without causing any halation due to holes or the like in the television camera 2, and is projected onto a cathode ray tube (not shown) connected to the television camera 2.

As described above, the inspection points of the inspection object W are continuously inspected while rotating. In this way, as the inspection of the inspection object W progresses and the rotating member 24 makes one rotation, a limit switch (not shown) detects that the rotating member 24 has made one rotation.
The rotation of the inspection object rotation motor 18 is stopped, and the rotation of the inspection object W is stopped.

All the parts to be inspected of the object W to be inspected are rotated by the rotating member 24.
When passing through the X-ray irradiation area by one rotation, the inspection ends with this.

If the object W to be inspected is relatively large,
By the above operation, only the ring-shaped area portion of the object W to be inspected that passes through the X-ray irradiation area is inspected. Therefore, in this case, the following operation is performed following the above operation.

That is, when the rotation of the inspected object W stops as described above, the reversible motor 6 is started again, and the mounting base 16 is moved over the upper and lower rails 14 and 15 by a predetermined distance (for example, the width of the X-ray irradiation area). The motor travels for a certain amount of time (minutes) and then stops by the action of a limit switch (not shown) or the like. Therefore, at this stop position (second inspection position), compared to the first inspection position, the rotation axis of the rotating member 24 approaches the X-ray irradiation area by the above-mentioned distance, or moves away from it. ing.
Therefore, the inspection object rotation motor 18 starts rotating again, and the inspection object W starts rotating integrally with the inspection object mounting jig 29, thereby removing the uninspected ring-shaped area of the inspection object W. The part is inspected.

When the above inspection process is repeated and the inspection at the final inspection position is completed, a signal is input to the reversible motor 6 to rotate the motor 6 in the opposite direction to that during inspection. Therefore, the reversible motor rotates in reverse, and the mount 16 returns to the initial position where the object W to be inspected is attached to the rotating member 24, thus completing the inspection.

Therefore, each part of a single object W to be inspected can be continuously inspected, and when inspecting a large number of objects W having the same shape as above, the object to be inspected attached to the object to be inspected mounting jig 29 can be inspected. Continuous inspection can be performed simply by replacing W.

Next, if the shape of the object to be inspected is different from the shape of the object W inspected previously, the rotating member 2
Remove the inspection object mounting jig 29 from 4, then attach the anti-halation mask and inspection object mounting jig suitable for the inspection object to the rotating member 24, and then attach the anti-halation mask and inspection object mounting jig to the rotating member 24. Attach the object to be inspected and perform the inspection.

In this embodiment, at least the portion of the object W to be inspected that has a through hole is masked, and the object W to be inspected is masked.
Although the other portions are shown as an example of a test object mounting jig that is not masked, the shape of the test object mounting jig is not limited to this. In other words, the X-ray transmittance distribution in the inspection object mounting jig,
In other words, the distribution of thick portions, thin portions, and through-hole portions should be determined depending on the object to be inspected, and it is clear that materials having various X-ray transmittance distributions can be used.

In the present invention, the attachment that holds the mounting jig and the object to be inspected may be any attachment that can move the object to be inspected so that the entire inspection area of the object passes through the X-ray irradiation area. Therefore,
In the above embodiment, since the object W to be inspected is an automobile disc wheel, the rail 1
A rotary member 24 movable along the horizontal planes 4 and 15 is used, but when the object W to be inspected is, for example, a member exhibiting a rectangular plate shape, the attachment is moved in the front-rear direction along a horizontal plane, for example. It is natural that it may be more convenient to be able to reciprocate in the left and right directions.

That is, it goes without saying that the direction of movement of the attachment and the driving mechanism therefor are not limited to those of the above embodiment.

(Effect of idea) This idea has the following effects.

By making the anti-halation mask and the inspection object mounting jig work together,
Since the object to be inspected and the anti-halation mask remain in the same position relative to each other, there is no need to replace the anti-halation mask for objects of the same shape, and it is easy to change the position of the attachment for holding the object to be inspected. The inspection position can be changed.

The object to be inspected is attached to the holding attachment, and each part of the object passes through the X-ray irradiation area in sequence, so that it can be inspected continuously at a predetermined inspection position.

The above allows the inspection time to be shortened.

It is versatile because the test object mounting jig can be freely replaced and removed from the attachment depending on the shape of the test object.

[Brief description of the drawings]

Figures 1 to 4 show an embodiment of this invention,
Figure 1 is a front view of the X-ray fluoroscopic inspection device, Figure 2 is a side view of Figure 1, Figure 3A is an enlarged view of the rotating member in Figure 1, Figure 3B is a plan view of Figure 1, and Figure 3B is a plan view of Figure 3A. Fig. 4A is a front view of the inspection object mounting jig, Fig. 4B is a sectional view taken along the line -A, Figs. FIG. 6 is a plan view. 1...X-ray tube, 2...X-ray fluorescence multiplier tube television camera, 3...device main body, 14, 15...rail,
16... Mounting base, 18... Test object rotation motor,
24... Rotating member, 29... Test object mounting jig,
W...Object to be inspected.

Claims (1)

[Claims for Utility Model Registration] An object is irradiated with X-rays emitted from an X-ray source, and the transmitted X-rays are visualized with an X-ray imaging device to see through and inspect the inside of the object. The device includes an attachment that holds an object to be inspected and a drive mechanism that moves the attachment in a predetermined direction, the object to be inspected is attached to the attachment via a mounting jig, and the attachment jig is The object to be inspected is detachable from the attachment, and the object to be inspected moves together with the mounting jig, and the attachment jig is attached to the positioning means of the object to be inspected in a positional relationship.
An X-ray fluoroscopy inspection apparatus characterized by having an X-ray transmittance distribution that does not cause halation in a radiation imaging device.