JPH04160334A - Inspecting apparatus for airtightness with image sensor - Google Patents

Abstract

PURPOSE:To enable execution of accurate inspection and automation of an inspecting process by providing an image sensor and a water surface light diffused-reflection preventing device. CONSTITUTION:In a state wherein a jig support arm 2 is positioned above and an airtight jig 3 is located on the surface of water, a component 7 to be inspected is fitted to the jig 3. When the arm 2 is lowered by an air cylinder 5, thereafter, the component 7 and the jig 3 are submerged into the water and a light diffused-reflection preventing device 6 is positioned also in the water on the occasion. In this state, compressed air is filled up in an airtight chamber 3a by a compressor 8 through an air hose 9. When there is no air leak in the component 7, airtightness is maintained for the airtight chamber 3a, bubbles are not generated, no image of the bubbles is picked up by an industrial camera 10, a processing is made by an image processing device 11 and it is detected that these is no abnormality in the component 7. When there is the air leak in the component 7, bubbles are generated from the airtight chamber 3a and they move upward and stick on the rear side of the device 6. The image of these bubbles is picked up by the camera 10 and processed by the device 11 and it is detected that there is the air leak in the component 7.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an airtightness inspection device for containers, parts, etc. that require airtightness.

"Prior Art" In conventional water immersion airtightness inspections, the presence or absence of air bubbles is determined by visual inspection using human clothing.

``Problem to be Solved by the Invention'' In the method using a conventional inspection device, when visually detecting leaking bubbles under the water surface, the bubbles are overlooked, resulting in a defective inspection.

Additionally, inspection for leaks on processing and assembly lines is the only work that requires human labor, which can become a bottleneck for automated lines.

An object of the present invention is to provide accurate inspection and automation of the inspection process by solving the above problems.

[Means for solving the problem] In order to achieve the above purpose, an image sensor and a water surface light reflection prevention device are installed in the submerged airtightness inspection device.

``Function'' ゛The airtightness inspection device with an image sensor of the first invention uses an industrial video camera to detect air bubbles generated from leakage points when compressed air is filled into a container or component to be inspected underwater in a sealed state. The presence or absence of the substance is determined and inspected using image processing.

In the second aspect of the invention, when capturing bubbles with an industrial video camera, it may not be possible to determine that they are bubbles due to diffuse reflection of light due to ripples on the water surface. By placing a water surface anti-reflection device below the water surface where an industrial video camera captures air bubbles, it is possible to maintain a state unaffected by the liquid on the water surface and accurately capture air bubbles.

"Example" Hereinafter, an example of the present invention will be described in detail based on FIG.

Figure M1 shows an embodiment of the present invention, in which an airtight chamber 3a is formed when a part 7 to be inspected such as a container or a part that requires airtightness is installed in the water tank 1. Tool 3 is installed. This airtight jig 3 is fixed to a jig support arm 2, and by moving the jig support arm 2 up and down along an arm guide rail 4 by an air cylinder 5, it moves above and below the water surface in the water tank 1 at f8. It is possible to move. In addition, a compressor 8 is connected to the airtight jig 3 via an air hose 9, and the airtight chamber 3a
It can be filled with compressed air.

On the other hand, above the water tank 1, there is an image sensor composed of an industrial video camera 10 that photographs the bubbles generated from the airtight chamber 3a, and an image processing device 11 that processes the images photographed by this industrial video camera 10. It is installed.

In addition, 6 is a light scattering prevention device made of transparent acrylic resin, etc., and is attached to the jig support arm 2, so that it is located in the water when the jig support arm 2 is lowered. This is to prevent air bubbles generated from the airtight chamber 3a from adhering in the water and from diffusely reflecting light.

Next, the performance of the above device will be explained.

“With the jig support arm 2 positioned above and the airtight jig 3 above the water surface, the part to be inspected 7 is attached to the airtight jig 3. Then, the jig support arm 2 is attached using the air cylinder 5. When lowered, the part to be inspected 7 and the airtight jig 3 are submerged in water. At this time, the light scattering and reflection prevention device 6 is also located in the water.

In this state, the airtight chamber 3a is filled with compressed air by the compressor 8 via the air hose 9. Inspected part 7
If there is no airtight leakage, the airtight chamber 3a is kept airtight and no air bubbles are generated, so no air bubbles are photographed by the industrial camera 10, and the image is processed by the image processing device 11 and the object to be inspected is It is detected that there is no abnormality in the component 7. On the other hand, if there is an airtight leak in the inspected part 7, the airtight chamber 3
Air bubbles are generated from a, and these air bubbles move upward and adhere to the back surface of the light scattering/reflection prevention device 6. This bubble is photographed by the industrial camera 10 and subjected to image processing by the image processing device 11, whereby it is detected that there is an airtight leak in the inspected part 7.

After the inspection is completed, the jig arm support 2 is raised using the air cylinder 5, and the inspected part 7 is removed from the airtight jig R2.

"Effects of the Invention" Since the image sensor of the first invention detects the presence or absence of air bubbles, it is also possible to detect minute air bubbles that were often overlooked in the past, resulting in extremely excellent effects.

In the light diffused reflection prevention device of the second invention, when the water surface is constantly shaken due to the vertical movement of the airtight jig, the image becomes unstable during the image processing process due to the diffused reflection of light, and bubbles cannot be identified. The device allows bubbles to be created under the water, while at the same time having the effect of completely eliminating the effects of waves on the water's surface.

The present invention enables unmanned submersion airtightness inspection procedures.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure 1 is an aquarium 2 is the jig support arm 3 is an airtight jig 3a is an airtight room 4 is arm guide rail 5 is an air cylinder 6 is a light scattering anti-reflection device 7 is the part to be inspected 8 is the compressor 9 is air hose 10 is an industrial video camera 11 is an image processing device It is. Patented earthquake generator Takatake Seisakusho Co., Ltd.

Claims (2)

[Claims] (1) An airtight jig that is installed in a water tank and forms an airtight chamber when the parts to be tested are installed, for testing for airtight leaks in parts to be tested such as containers and parts that require airtightness. An airtightness inspection device with an image sensor, comprising: a compressor that fills the airtight chamber with compressed air; and an image sensor that detects air bubbles generated from the airtight chamber. (2) The airtightness inspection device with an image sensor according to claim (1), further comprising a light scattering prevention device that prevents diffuse reflection of light while the bubbles adhere in water.