JPS5928858B2 - Inspection method for bottle bottom scratches - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a base flaw inspection method for inspecting flaws such as cracks or bubbles occurring at the base of a bottle to be inspected.

It has been difficult to detect scratches on the base of a bottle to be inspected using a detector placed above the mouth of the bottle using transmitted light from a projector that illuminates the base from below the base of the bottle. Alternatively, this drawback can be overcome by irradiating light toward the - part of the base and having a detector placed corresponding to the base detect the light that hits the scratches inside the base and is reflected. , which allows for reliable and easy inspection of basal scars. An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, 1 corresponds to the bottle to be inspected, 2 corresponds to the light source arranged corresponding to the side surface of the bottom of the bottle 1 to be inspected, and 3 corresponds to the base surface of about half of the side opposite to the side where the light source 2 is located. A large number of light receiving cells are arranged as shown in FIG. 2. The light receiving cell 3 and the light shielding plate 4 are mounted on a support base 5. The light projected from the light source 2 enters the inside of the bottle bottom from the base side, is reflected at the interface of scratches 6 caused by cracks or bubbles, etc., and a part of it exits to the bottom of the bottle and reaches the light receivers arranged in large numbers on the support stand 5. It reaches one of the cells 3 and an abnormal signal is obtained. If there is no scratch 6, no downward reflected light will be emitted, so the light receiving cell 3 will not receive light and no abnormal signal will be generated. Since the direction and angle of reflection of cracks etc. vary depending on the position and angle, it is necessary to scan the detected bottle 1 and the detection hot spot while changing their positions with respect to each other. Rotate bottle 1,
Although it is advisable to fix the light receiving cell 3, it is also possible to scan by rotating the light source 2 and the light receiving cell 3 together with the support base 5 so that the light source 2 rotates on a concentric circle on the outer periphery of the base.

In this case, electrical connection to the light source 2 and the light receiving cell 3 is made via a slip ring or the like. Also, inspected bottle 1
In order to extract the signal of the light receiving cell 3 as the test result only when the cell is at the test position, it is necessary to match it with the bottle center synchronization signal.

The synchronization signal may be detected by direct photoelectric detection of the bottle opening or the like, or indirectly detected by a star wheel or the like of the bottle handling mechanism. Figure 2 shows an inspection method in which scanning is performed by rotating a light-shielding plate instead of rotating the bottle or the light emitter/receiver, and the light source 1 is fixed at a position below the outer periphery of the bottle 1 to be inspected at the inspection position. The light is guided into the inside of the bottom surface of the bottle 1 to be inspected by a ring cone shaped reflecting mirror 8 provided concentrically around the outer periphery of the bottom surface of the bottle 1 to be inspected.

Further, the ring cone-shaped reflecting mirror 8 is configured to be able to move up and down between an inspection position corresponding to the outer periphery of the side surface of the bottom of the bottle and a position below which the bottle is allowed to pass. A large number of light-receiving cells 9 are arranged below the bottom surface of the bottle 1 to be inspected, corresponding to the bottom surface of the bottle, and are placed on a fixed support base 10, on which the light-receiving cells 9 are placed so as to correspond to about half of the bottom surface of the bottle. A substantially semicircular light-receiving cell light-shielding plate 11 that allows only the light-receiving cell 9 to receive light is provided.
1 rotates around the center of the group of light-receiving cells and sequentially scans half of the bottom of the bottle. Reference numeral 12 denotes a substantially semicircular arc-shaped light source shielding plate provided so as to cover the portion of the ring-shaped light source 7 on the side opposite to the light receiving cell shielding plate 11;
The upper surface is subjected to a surface treatment to prevent reflection, and rotates integrally with the light-receiving cell light-shielding plate 11 so that the light-receiving cell light-shielding plate 11 is always
It is designed to cover the top of the light source 7 on the opposite side, and the light source 7
The light irradiated into the bottom surface of the bottle through the reflecting mirror 8 is always projected from the light receiving cell light shielding plate 11 side.

Reference numeral 13 denotes a pulley for rotating both the light shielding plates 11 and 12, which is rotationally driven by a belt 14.

When the bottle 1 to be inspected reaches the center of the inspection position as shown in FIG. It reflects the light and projects it inside the bottle parallel to the bottom surface.

At this time, the light source light shielding plate 12 works to illuminate only about half the circumference of the bottom of the bottle on the side of the light receiving cell light shielding plate 11, and the light receiving cell light shielding plate 11 covers the half of the bottom of the bottle corresponding to the part without the light shielding plate 11. It functions to be able to receive only the light reflected from the scratch 15, and prevents the light emitted from the light source 7 from directly irradiating the light receiving cell 9. Next, both light shielding plates 11 and 12 are driven by a belt 14, and the light source 7 sequentially scans approximately half of the bottom surface of the bottle. After the light shielding plates 11 and 12 have rotated one or more revolutions, the reflecting mirror 8 is lowered and the bottle 1 to be inspected is moved. In this way, the bottles 1 are inspected one after another.

The synchronization signal is generated in the same manner as in the case of FIG. 1, and only during synchronization, the signal of the light receiving cell 9 is compared with a set level, and if it is larger, the signal can be sent to the bottle removing mechanism. FIG. 3 shows a case where the light sources 16 and 17 are located diagonally below the bottom side of the bottle 1 to be inspected and below near the outer periphery to inspect bottle bottom flaws on the bottom side of the bottle, where 18 is a light receiving cell and 19 is a light receiving cell. It is a light shielding plate.

The light sources 16 and 17 emit light into the bottom surface of the bottle, and the light is reflected by hitting a flaw 20 on the bottom of the bottle such as an internal crack or bubble, and the light emitted downward is detected by a light receiving cell 18.
Scanning is performed by rotating the bottle 1 to be inspected itself or by rotating the light sources 16, 17 and the light receiving cell 18. In Fig. 4, instead of temporarily stopping the movement of the bottle 1 to be inspected and rotating and scanning it, the bottle 1 to be inspected is moved while rotating, and linear light sources 21 and 22 along the movement path are directed against the side of the bottom of the bottle. A case is shown in which detection is performed by emitting light from diagonally downward or from below near the outer periphery. In this case, a large number of light receiving cells 23 are arranged below corresponding to about half of the bottom of the bottle 1 and along the movement path of the bottle 1. Bottom scratch 25 is 1
It will be detected at any position during rotation.
24 is a light shielding plate provided along the moving route.

Note that the light receiving cells 3, 9, 18, and 23 may be installed corresponding to approximately half, more than half, or less than half of the bottom surface of the bottle, or may be installed only at positions corresponding to the vicinity of the outer edge excluding the center of the bottom surface of the bottle. It's okay.

As described above, according to the present invention, during inspection, either the bottle to be inspected, the light source, or the detector side is rotated, so the entire bottom of the bottle can be reliably inspected, and it is not necessary to provide a large number of light sources around the bottle to be inspected. In addition, since direct light from the light source does not enter the detector side to prevent unnecessary light from being detected, it is possible to reliably detect cracks or bubbles.

[Brief explanation of the drawing]

FIGS. 1A and 1B are a front view showing one embodiment of the inspection device used in the present invention and its view taken along the line A-A. FIGS. 2A and 2B are a front view and its B showing another embodiment. 1B arrow view, Figure 3A
, b are front views A and C showing still another embodiment.
A view taken along the arrow C, and FIGS. 4A and 4B are a front view and a view taken along the line D--D showing still another embodiment. 1...Bottle to be inspected, 2, 7, 16, 17, 21,
22... Light source, 3, 9, 18, 23...
・Light receiving cell, 4, 11, 12, 19, 24...
Light shielding plate, 6, 15, 20, 25... Scratches on the bottom of the bottle.

Claims (1)

[Claims] 1. Light is irradiated from a light source toward the side surface or a part of the bottom surface of the bottle to be inspected, and the light reflected at the interface of scratches caused by cracks, bubbles, etc. that occur inside the bottom surface of the bottle is detected in a manner corresponding to the base surface. It is detected by the placed detector, and during inspection, either the bottle to be inspected, the light source, or the detector side is rotated, and the light that enters directly from the light source to the detector side is blocked by a light shielding plate. Characteristic bottle bottom flaw inspection method.