JP2000283740A - Device for inspecting appearance of extrusion molded products - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for inspecting an appearance which can inspect the appearance of extrusion molded products in multiple directions at a low cost, detect micro failures accurately, and inspect the extrusion molded products in an in-line state which are produced continuously. SOLUTION: This device 7 for inspecting the appearance of extrusion molded products is provided with illuminating devices 10, 11 and 12 which emit inclined lights toward the surfaces 1a, 1b and 1c of extrusion molded products 1, a one-dimensional CCD camera 15 to photograph the extrusion molded products 1 in multiple directions by receiving lights directly or by means of reflection mirrors 13 and 14 that are emitted from the illuminating devices 10, 11 and 12 and are reflected on surfaces 1a, 1b and 1c, and a judging device 17 to judge whether or not the products 1 are defective on the basis of the quantity of lights received by the CCD camera 15 that varies according to failures of appearance on the surfaces 1a, 1b and 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting the appearance of an extruded product for detecting a defective appearance of the extruded product.

[0002]

2. Description of the Related Art For example, a gutter-shaped extruded product 1 shown in FIG.
When inspecting the appearance of the
Since it is necessary to inspect b and 1c, the extruded product 1 must be observed from above and from both sides.
Conventionally, when performing such an appearance inspection from multiple directions, a plurality of cameras are installed so that images of each surface of the inspection object can be captured, the camera itself is moved, or the inspection object is moved. Or, a method of rotating is used. Alternatively, as described in JP-A-6-273339, there is a method in which an image of each surface of the inspection object held at a fixed position is imaged from one direction by using a plurality of reflecting mirrors.

[0003]

However, when a method of using a plurality of cameras or moving a camera or an object to be inspected is adopted, there is a problem that the configuration of the inspection apparatus becomes complicated and the cost increases. .

In the appearance inspection apparatus described in Japanese Patent Application Laid-Open No. 6-273339, the above-mentioned problem can be solved since each surface of the inspection object can be imaged from one direction, but the defect to be detected is small. If it is not easy to find out, for example, if the object is an object, how to judge the quality of the inspection object becomes a problem.

In addition, since extruded products are generally produced continuously in a series of lines, it is desirable from the viewpoint of production efficiency to inspect the extruded products flowing in the line without stopping them, but from the viewpoint of production efficiency. In the appearance inspection apparatus described in the publication, it is necessary to temporarily hold the inspection object at a fixed position, and it is difficult to meet such a demand.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to realize the appearance inspection of an extruded product from multiple directions at a low cost, and to detect minute defects with high accuracy. It is another object of the present invention to provide a visual inspection device capable of performing in-line inspection of extruded products manufactured continuously.

[0007]

In order to solve the above-mentioned problems, an apparatus for inspecting the appearance of an extruded product according to claim 1 comprises: a lighting device for irradiating light obliquely to each surface of the extruded product; An imaging device that captures the extruded product from multiple directions by receiving the light from the lighting device reflected by the various parts of the surface directly or through a reflecting member, and changes due to poor appearance existing in the various parts of the surface. And a quality judgment device for judging the quality of the extruded product based on the amount of light received by the imaging device.

According to the extruded product appearance inspection apparatus,
The illumination device irradiates light obliquely to each part of the surface of the extruded product with a simple configuration using a reflecting member, and irradiates light to each part of the surface of the extruded product with an illuminating device. Since the change is made sensitively and the appearance of each part of the surface is inspected based on the change, the appearance inspection of the extruded product from multiple directions can be realized at low cost, and even a minute defect can be detected with high accuracy.

According to a second aspect of the present invention, there is provided an apparatus for inspecting the appearance of an extruded product according to the first aspect, wherein the imaging device is provided above a conveyor device for conveying the extruded product. The reflection member is installed on a side of the conveyor device, and the imaging device directly receives light reflected on an upper surface of an extruded product moved by the conveyor device, and emits light reflected on a side surface thereof. The extruded product is imaged from multiple directions by receiving light through a reflection member.

According to this extruded product appearance inspection apparatus,
Since the imaging device and the like constituting this do not hinder the movement of the extruded product by the conveyor device, the appearance inspection of the top and side surfaces of the continuously produced extruded product can be performed in-line.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an extruded product manufacturing line in which the extruded product appearance inspection apparatus according to the present invention is installed.
This production line is used for producing an extruded product 1 (see FIG. 6), and includes a raw material supply unit 2, an extruder 3, a mold 4, a cooling device 5, a take-off device 6, a visual inspection device 7, a cutting device 8, and a transfer device 8. A loading device 9 is provided. The extruded product 1 manufactured here has a cross-sectional dimension of about 100 mm (width) × 50 mm (height) and is shipped as a gutter product.

As shown in FIG. 1, the appearance inspection device 7 includes illumination devices 10, 11, 12 and a reflection mirror 1 as a reflection member.
3, 14, one-dimensional CCD camera 15 as an imaging device,
It is roughly composed of an A / D conversion device 16 and a pass / fail judgment device 17. The visual inspection device 7 is provided around a conveyor device (not shown), and the conveyor device conveys the extruded product 1 in the direction of arrow A along the production line.

The illuminating devices 10, 11, and 12 are halogen illuminations. The illuminating device 10 emits light in an oblique direction to a bottom surface 1a of the extruded product 1 moved by a conveyor device. It is provided above. Also,
The lighting devices 11 and 12 are respectively provided on the side surfaces 1 of the extruded product 1.
b, 1c are provided on the side of the extruded product 1 so as to irradiate light in an oblique direction. That is, the lighting device 1
Reference numerals 0, 11, and 12 denote each surface 1a, 1b, 1c of the extruded product 1.
Irradiating sections 10a and 11 having a width d so that they can be illuminated over the entire width or the entire height of the extruded article 1 are installed at an angle of about 10 ° (about 80 ° with respect to the normal to each surface).
a, 12a, and the irradiation units 10a, 11a, 12a
Light is emitted more toward the moving direction of the extruded product 1 (the rear side of the line).

The reflecting mirrors 13 and 14 have reflecting surfaces 13a and 13a, respectively.
14a is installed behind the illuminating devices 11 and 12 so as to make a predetermined angle θ (for example, 45 °) with the horizontal plane and to face the side surfaces 1b and 1c of the extruded product 1. The reflecting mirrors 13 and 14 are provided on the side surfaces 1 b and 1 of the extruded product 1.
The illumination light reflected at c is reflected toward a one-dimensional CCD camera 15 described below.

The one-dimensional CCD camera 15 is used to
It is installed above the extruded product 1 and behind the lines of the lighting devices 10, 11, 12 so as to face the bottom surface 1a. Each pixel constituting the one-dimensional CCD camera 15 has:
They are arranged along the width direction of the moving extruded product 1 (the direction of the arrow A and the direction of the arrow B perpendicular to the horizontal plane). The one-dimensional CCD camera 15 can take an image of the bottom surface 1a by directly receiving the reflected light on the bottom surface 1a of the extruded product 1, and the side surfaces 1b and 1c of the extruded product 1.
The side surfaces 1b and 1c can be imaged at the same time by receiving the reflected light of the light source through the reflecting mirrors 13 and 14. Here, as the one-dimensional CCD camera 15,
A pixel having 2048 bits and a visual field of about 250 mm (resolution = 0.12 mm / pixel) is used.

The A / D converter 16 takes in an image signal from the one-dimensional CCD camera 15, A / D converts the image signal, and sends the conversion result to the pass / fail judgment device 17. The pass / fail determination device 17 performs a binarization process on the input from the A / D conversion device 16 and determines pass / fail of the appearance of the extruded product 1 as described later. The result of the determination by the pass / fail determination device 17 is sent to the transfer device 9, where the non-defective products are sorted into the non-defective carts, the defective products are sorted into the defective carts, and the defective products flow to the post-process. Not to be. The above flow is summarized in FIG.

In the appearance inspection device 7 according to this embodiment, the bottom surface 1a and the side surfaces 1b, 1c (hereinafter, referred to as the bottom surface 1a) of the extruded product 1 are provided.
These are also simply referred to as “surfaces”. In FIG. 4), a convex portion as shown in FIG. 4 formed by the presence of a foreign substance and having a diameter of 0.5 mm or more is detected as poor appearance. Hereinafter, the operation of the appearance inspection device 7 will be described.

The illuminating light from the illuminating devices 10, 11 and 12 is reflected on the surface of the extruded product 1 directly or through the reflecting mirror 1
The light is received by the one-dimensional CCD camera 15 via 3 and 14. At this time, the extruded product 1 is moving in the direction of arrow A, and the light receiving amount of each constituent pixel of the one-dimensional CCD camera 15 is sequentially detected in the direction of arrow B, and the extruded product 1 is scanned in the same direction. Therefore, the bottom surface 1 a and the side surface 1
b and 1c are continuously imaged on the entire surface. Thus, it is possible to inspect continuously manufactured extruded products 1 on a production line while reducing costs by performing imaging from one direction using a one-dimensional CCD camera 15, thereby improving inspection efficiency. As a result, production efficiency can be improved.

The amount of light received by the one-dimensional CCD camera 15 is
When the surface of the extruded product 1 is uniform, it is not less than a certain value and hardly changes depending on the imaging location. On the other hand, when the surface of the extruded product 1 has a convex portion 1d (see FIG. 4), when light is irradiated from the oblique direction to the surface, the vicinity of the convex portion 1d becomes dark, and the one-dimensional CCD camera 15 has a characteristic that the amount of received light decreases. For this reason, by setting an appropriate binarization threshold value in advance, when the convex portion 1d is scanned, the amount of light received by the one-dimensional CCD camera 15 is reduced as shown in FIG. , The abnormal appearance of the extruded product 1 can be detected. Further, the width of the foreign matter (the width of the convex portion 1d) can be detected based on the width w of the portion below the binarization threshold value. stored in advance in the width w _o corresponding to 0.5mm as quality determination reference value, poor appearance unit the imaging position in the case of the former the detected width w as compared to the width w _o exceeds the latter It is judged as. Thereby, the appearance inspection device 7 can detect even a minute defect with high accuracy.

Although the specific embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the above-described configuration, and design changes and the like may be made without departing from the scope of the invention. Even if present, it is included in the present invention. For example, even if the appearance defect to be detected is not convex but concave or other,
If the amount of light received by the imaging device changes due to non-uniform reflection of the light emitted from the oblique direction, the inspection can be performed similarly. Further, the one-dimensional CCD camera 15 is used for the extruded product 1.
Although the reflected light on the bottom surface 1a is directly received, the reflected light on all the surfaces to be imaged may be received via the reflecting member.

[0022]

As described above, according to the first aspect of the present invention, it is possible to perform imaging from multiple directions with a simple configuration using a reflecting member, and to apply a lighting device to each part of the surface of an extruded product. Irradiates light obliquely to change the amount of light received by the imaging device in response to poor appearance. Based on this, the appearance of each part of the surface is inspected. , And a very small defect can be detected with high accuracy.

According to the second aspect of the present invention, since the imaging device and the like constituting the same do not hinder the movement of the extruded product by the conveyor device, the appearance inspection of the top and side surfaces of the continuously produced extruded product is performed in-line. It can be carried out.

[Brief description of the drawings]

FIG. 1 shows an appearance inspection apparatus for an extruded product according to the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 2 is an explanatory diagram showing a production line for an extruded product provided with the appearance inspection device of FIG. 1;

FIG. 3 is an explanatory diagram showing a processing procedure in a visual inspection device and a transfer device.

FIG. 4 shows an extruded product having a convex portion on the surface,
(A) is a perspective view, (b) is an enlarged sectional view along the CC line of (a).

FIG. 5 is an explanatory diagram showing a change in the amount of light received by a one-dimensional CCD camera when a convex portion is detected.

FIG. 6 is an explanatory view showing a gutter-shaped extruded product as an example of an extruded product requiring inspection from multiple directions.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Extruded product 1a Bottom surface (each surface) 1b, 1c Side surface (each surface) 7 Visual inspection device 10, 11, 12 Illumination device 13, 14 Reflector (reflective member) 15 One-dimensional CCD camera (imaging device)

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2F065 AA49 BB05 BB11 BB15 CC00 DD00 DD06 FF44 GG02 HH12 HH14 JJ02 JJ07 JJ09 JJ25 LL12 MM03 PP15 QQ03 QQ04 QQ23 QQ25 RR09 2G051 AA90 AB20 BA01 CA01 EA01 DA03 EB02 4F207 AM02 AM32 KA01 KW21 KW50

Claims (2)

[Claims] An illumination device for irradiating light to each part of the surface of an extruded product in an oblique direction, and receiving light from the illumination device reflected by each part of the surface directly or via a reflecting member. An imaging device that images the extruded product from multiple directions, and a pass / fail determination device that determines pass / fail of the extruded product based on the amount of light received by the imaging device that changes due to poor appearance present on each surface portion. An appearance inspection device for an extruded product, comprising: 2. The extrusion device according to claim 1, wherein said imaging device is installed above a conveyor device for transporting said extruded product, said reflection member is installed beside said conveyor device, and said imaging device is moved by said conveyor device. The image of the extruded product is taken from multiple directions by directly receiving the light reflected on the upper surface of the product and receiving the light reflected on the side surface of the product via the reflecting member. 2. The appearance inspection device for an extruded product according to 1.