JPH09178671A - Inspection apparatus for inside of can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inspection apparatus by which the inside of a can is inspected and by which whether its quality is good or not can be judged automatically and with good efficiency by a method wherein the photographed image of the inside of the photographed can is compared with a reference image and the quality is judged. SOLUTION: An inspection apparatus is provided with photographing parts 34, 37 which photograph the inside of a can D, with movement mechanism parts 35, 49 which move the photographing parts to the inside and the outside of the can D through an entrance and an exit, with an image storage part 52a in which a reference image, at the inside of the can D, to be used as a quality judgment reference is stored and with a quality judgment part 52b which judges a quality while the photographed images of the inside of the can D photographed by the photographing parts 34, 37 are compared with the reference image. The reference image is obtained in such a way that a clean drum can whose shape is identical to the drum can D as a quality judgment object and which can be used as a reference is photographed in a first photographing position, a second photographing position and a third photographing position, and photographed images in the respective positions are stored in advance in the storage part 52a. The quality judgment part 52b compares one or two or more reference images with the images which correspond to them and which are photographed actually, and the quality of the drum can D as the quality judgment object is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can for judging the quality of a drum or the like by examining, for example, rust generated on the inner surface of a drum, foreign matters adhering to the inner surface, and remaining liquid such as oil or water. It relates to an internal inspection device.

[0002]

2. Description of the Related Art A conventional in-can inspection apparatus of this type is disclosed in Japanese Patent Publication No. 5-81013. The conventional device includes a fiberscope that allows a lower end to be inserted into the can through an entrance formed in a top plate of the can, and a prism that is rotatably attached to the lower end of the fiberscope. The field of view is changed by rotating the prism in a predetermined direction so that the entire inside of the can can be inspected through a fiberscope.

[0003]

However, in the above-mentioned conventional apparatus, since the quality is determined based on the subjectivity of a person who inspects the inner surface of the can, the criterion is ambiguous. further,
For example, in a series of automatic regeneration process and automatic new can manufacturing process, when trying to judge the quality of continuously regenerated or newly manufactured cans continuously, it is necessary to frequently rotate the prism and take in and out the fiber scope. However, there are drawbacks in that it takes time and effort, and it is not possible to efficiently determine the quality.

Accordingly, the present invention provides a method for inspecting the inner surface of a can,
An object of the present invention is to provide an in-can inspection apparatus capable of automatically and efficiently determining the quality.

[0005]

According to the present invention, photographing units 34 and 37 for photographing the inside of the can D, moving mechanism units 35 and 49 for moving the photographing units inside and outside the can D through the entrance and exit, and criteria for judging acceptability are provided. Image storage unit 52 that stores the reference image in the can D
a and a pass / fail determination unit 52b that performs pass / fail determination by comparing the captured image in the can D captured by the capturing units 34 and 37 with the reference image
And

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. The in-can inspection apparatus according to the present invention includes
A drum can mounting portion A disposed at the lower part of the frame 1, an in-can inspection portion B disposed at an intermediate portion of the machine frame 1, and a control portion C disposed at a distance from the machine frame 1 (FIG. 1). .

The machine casing 1 has four standing frames 2 to 5 arranged so as to form square vertices, and a horizontal frame 6 to 9, 10 between an intermediate portion and an upper portion thereof.
13 and a horizontal frame 14 is provided between the horizontal frames 6 and 8 facing each other between the intermediate portions.

The drum mounting portion A is provided on a support base 15 having a front upright plate 15a and a rear upright plate 15b formed in parallel with each other.
And four drum mounting rollers 16 to 19 rotatably arranged between the upper edges of the front-side upright plate 15a and the rear-side upright plate 15b, and the drum cans to be determined mounted on these rollers. It comprises a can positioning portion 20 for positioning D and an impact applying member 21 (FIG. 3).

Each of the drum mounting rollers 16 to 19 is driven to rotate by a motor (not shown), and the drums D mounted thereon are transferred to the drum mounting rollers 16 to 19.
It can be moved in 19 arrangement directions.

The positioning portion 20 includes a movable stopper 23 slidable along two slide rails 22, 22 arranged between the front upright plate 15a and the rear upright plate 15b of the support base 15. A fixed stopper 24 fixed to the inner surface of the front upright plate 15a so as to face the movable stopper 23.
And a positioning fluid pressure cylinder 25 disposed between the movable and fixed stoppers 23 and 24 (FIG. 3).

The movable stopper 23 is provided on the slide rail 2.
It comprises a horizontal rectangular substrate 26 fitted to the substrates 2 and 22, and contact rollers 27 protruding from both ends of the substrate 26 toward the body Da of the drum D and supported.

The fixed stopper 24 is composed of a substrate 28 fixed to the inner surface of the front upright plate 15a, and contact rollers 29, 29 protruding and supported on both ends of the substrate 28 toward the body Da of the drum D. Become.

The impact applying member 21 applies an impact to the bottom plate Db of the drum D so as to generate ripples and splashes in the liquid such as water or oil remaining in the drum D. Pressure cylinder (FIG. 3).
That is, when water, oil, or the like remains in the drum D, the impact is applied to the bottom plate Db to cause ripples or splashes on the water, oil, or the like. Part 3
4, 36 can be taken.

In the drum mounting section A having the above structure, the rod 25a of the positioning fluid pressure cylinder 25 is extended,
The movable stopper 23 and the fixed stopper 24 are widely opened, and the drum can D is moved between them. Thereafter, when the rod 25a of the positioning fluid pressure cylinder 25 is retracted, the drum D moves to the fixed stopper 24 along with the movement of the movable stopper 23, and is positioned at a predetermined position.

In the in-can inspection section B, the drive rod 30a is directed downward, and the cylinder body 3 is attached to the horizontal frame 14.
The air-hydraulic cylinder 30 has an air-hydro cylinder 30 fixed thereto, and an elevating gantry 31 which is fixed to the driving rod 30a thereof and which is moved up and down while maintaining a horizontal state.

A top plate detection sensor S for stopping the lift frame 31 at a position close to the top plate Dc of the drum D
And two large and small clamping mechanisms 32 and 33 for clamping the large-diameter entrance Dd and the small-diameter entrance De formed on the top plate Dc of the drum D, respectively, and the inside of the can through the entrance Dd. A first elevating mechanism 35 for moving the first photographing unit 34 in and out, and a second elevating mechanism 37 for moving the second photographing unit 36 in and out of the can through a small-diameter doorway De are mounted. Have been.

The large clamp mechanism 32 includes a fixed clamp 3
2a, a movable clamp 32b which clamps the base of the entrance Dd therebetween, and a fluid pressure cylinder 38 which drives the movable clamp 32b to open and close. As in the case of the large clamp mechanism 32, the small clamp mechanism 33 includes a fixed clamp 33a, a movable clamp 33b for clamping the mouthpiece De between the fixed clamp 33a, and a fluid pressure cylinder 39 for opening and closing the movable clamp 33b. Consists of

The first elevating mechanism 35 has a long supporting member 40 whose lower end is rotatably supported by the elevating gantry 31, and the long supporting member 40 is tilted about its lower end 40a. A hydraulic cylinder 41 for tilting and a hydraulic cylinder 42 for lifting and lowering fixed along the long support member 40.
And a photographing unit support rod 43 that is moved up and down by driving the lifting fluid pressure cylinder 42, and a rotating fluid pressure cylinder (not shown) that rotates the photographing unit support rod 43 within a predetermined angle range. The first photographing unit 34 is fixed to the lower end of the photographing unit support rod 43.

The first photographing section 34, as shown in FIG.
For example, a transparent cylindrical case 45 made of vinyl chloride resin or the like
Inside, a fluorescent lamp 46 and a CCD (Charge
Coupled Device) 47 and the like are hermetically sealed. The CCD 47 is disposed so as to intersect with the long axis of the cylindrical case 45. When the first photographing unit 34 is inserted into the drum D, the inner surface of the top plate Dc and the inner surface of the trunk Da of the drum D are provided. You can shoot almost the upper half of the camera.

In the first elevating mechanism 35, the first photographing unit 34 is set to a standby position (a) where the first photographing unit 34 is kept above the entrance Dd of the drum D, and the first photographing unit 34 is moved downward by a predetermined distance via the entrance Dd. With the moved first photographing position (b) and the first photographing unit 34 moved to the first photographing position (b),
The long support member 40 can be moved to a second photographing position (C) in which the long support member 40 is inclined at a predetermined angle (FIG. 1).

The second lifting mechanism 36 comprises a supporting member 48 erected on the lifting base 31 and a lifting / lowering fluid pressure cylinder 49 with a cylinder 49b fixed with the drive rod 49a facing downward. The second imaging unit 36 composed of the CCD 47 is fixed to the lower end of the imaging unit support rod 50 connected to the driving rod 49a.

In the second lifting mechanism 36, the second photographing unit 36 is moved from the standby position (d) where the second photographing unit 36 is standby above the entrance De of the drum D to the entrance De from the standby position (d). It can be moved to a third shooting position (e) vertically lowered into the drum D by a predetermined distance via the camera (FIG. 1). When the second photographing unit 36 is inserted into the drum D, the lower half and the bottom inner surface of the drum inner surface of the drum D can be photographed.

The first photographing unit 34 and the second photographing unit 3
6 may be configured such that when these are inserted into the drum can D, only a part of the region inside the drum can D can be photographed, or the boundaries between the two photographing regions overlap each other. May be set so that there is no blind spot in the photographing area in the drum can D.

The control section C includes a sequence controller 51 for controlling the operation of the entire apparatus, an image recognition section 52, a color CRT 53 for displaying images photographed by the first and second photographing sections 34 and 36, and will be described later. It has a monochrome CRT 54 for displaying a reference image and an operating device 55 (FIG. 6).

The image recognizing unit 52 stores a reference image serving as a criterion for determining whether the image is good or bad, the respective images taken on the inner surface of the drum D and sent from the first and second photographing units 34 and 36, and A quality judgment unit 52b for judging the quality of the drum D by comparing with the reference image.

The reference image has the same shape as that of the drum D to be judged, and a beautiful drum that can be used as a reference is photographed at the first to third photographing positions (b), (c), and (e). The captured image at the position is stored in the storage unit 52a in advance.

The pass / fail judgment unit 52b includes a reference image at the first photographing position (b) and a drum can D to be judged as pass / fail.
The quality of the drum can D is determined by comparing the actual photographed image at the same photographing position (b) with the reference image at the first and third photographing positions (b) and (e). Alternatively, the quality of the drum D may be determined by comparing both of the actual captured images of the drum D at the same shooting positions (B) and (E).

That is, the pass / fail judgment unit 52b determines whether 1 or 2
The quality of the drum can D, which is a quality determination target, is determined by comparing the above-described reference images with the actually captured images corresponding to these.

After comparing the photographed image at each photographing position with the reference image, a shock is applied to the bottom plate Db of the drum D by the shock applying member 21, and thereafter, the photographed image at each photographing position and the reference image are again compared. Are compared to determine the quality of the drum D. In other words, the quality determination unit 52b determines whether the impact imparting member 21 determines the quality of the drum D
A photographed image of the inner surface of the can before giving an impact to the bottom plate Db of
And a photographed image in the can after applying an impact to the bottom plate Db,
Each of them is compared with the reference image to determine the quality.

Further, based on the above determination result, the monochrome C
A message such as "pass", "fail", "attached foreign matter", or "oil or moisture remains" is displayed on the RT 54.

Next, the operation of the present apparatus will be described. When the drum can D to be judged as good or bad is positioned on the drum can mounting portion A, the elevating gantry 31 is moved downward. Stop.

Next, the large and small clamp mechanism portions 32 and 33 clamp both the mouthpieces of the entrance Dd and De of the drum can D. In this clamped state, the first photographing unit 34 is inserted into the drum D via the entrance Dd, and is moved to the first photographing position (b). The second photographing unit 36
Is inserted into the drum D via the entrance De, and is moved to the third shooting position (e).

At each of the photographing positions, the inside of the drum D is photographed by the first and second photographing units 34 and 36, respectively. After the photographing, each photographed image is sent to the image recognition unit 52 of the control unit C, and the state inside the drum D is also displayed on the color CRT 53.

When the above photographing is completed, the impact applying member 21
As a result, an impact is applied to the bottom plate Db of the drum D. Immediately after this, the second imaging by the first and second imaging units 34 and 36 is performed. That is, when water, oil, or the like remains in the drum D, an impact is given to the bottom plate Db,
Ripples and splashes occur in water, oil, and the like, which can be captured by the second photographing.

The two captured images are temporarily stored, and each of the captured images is compared with the reference image. First, the first captured image is compared with the reference image. In this first comparison, it is possible to detect the contamination on the inner surface of the drum D, the presence or absence of foreign matter, and the like. Then, at this stage, the product that is determined to be defective is processed as defective without performing the second photographing. At this time, a message such as "There is dirt or foreign matter attached" or "Fail" is displayed on the color CRT 53.

A second comparison is carried out for a product determined to be non-defective by the first comparison. At this time, drum D
If liquid such as water or oil remains inside the drum D, the ripples and splashes generated by the second imaging can be detected, and the drum D is treated as defective. When it is determined that the product is defective in the second comparison, a message such as "water or oil remains" is displayed on the color CRT 53. When it is determined that the product is non-defective, a message such as “pass” is displayed on the color CRT 53.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention. The impact applying member may be provided not only at a position where the bottom plate of the can body is subjected to an impact, but also at a position where the top plate or the body portion is impacted.

[0038]

According to the present invention, a photographing unit for photographing the inside of a can, a moving mechanism unit for moving the photographing unit inside and outside of the can through the entrance and exit, and an image in which a reference image inside the can as a criterion of quality is stored. Since a storage unit and a pass / fail judgment unit that performs a pass / fail judgment by comparing a captured image of the inside of the can to be inspected taken by the shooting unit with a reference image are provided, the pass / fail judgment is performed together with the inspection of the inside of the can It can be done automatically and efficiently.

[Brief description of the drawings]

FIG. 1 is a front view of a mechanical system of an in-can inspection apparatus of the present invention.

FIG. 2 is a side view of the device.

FIG. 3 is a sectional view taken along line II of FIG. 1;

FIG. 4 is a sectional view taken along line II-II in FIG.

FIG. 5 is an enlarged sectional view showing details of a first photographing unit.

FIG. 6 is a block diagram showing a configuration of a control unit.

[Explanation of symbols]

 34, 37 Imaging unit 35, 49 Moving mechanism unit 52a Image storage unit 52b Good / bad determination unit D Drum can Dd, De Entrance / exit

Claims (3)

[Claims] 1. An in-can inspection device for determining the quality of a can in which a door is formed on a top plate, and an imaging unit for photographing the inside of the can and a moving mechanism unit for moving the inside and outside of the can through the door. And an image storage unit that stores a reference image in the can that is a reference for determining quality, and a pass / fail determination unit that performs a pass / fail determination by comparing the captured image in the can shot by the shooting unit with the reference image. An in-can inspection device characterized by having. 2. The in-can inspection device according to claim 1, further comprising an impact imparting member for imparting an impact to the bottom plate of the can so as to generate ripples and splashes in the liquid remaining in the can. 3. The good / bad determination unit captures an image of the inside of the can before the impact is applied to the bottom plate of the can to be determined by the impact imparting member, and an image of the inside of the can after the impact is applied to the bottom plate. The in-can inspection device according to claim 1 or 2, wherein the image is compared with a reference image to make a pass / fail judgment.