JP2640373B2 - Optical detection device for molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a synthetic resin such as a molding, a weather strip or a hose extruded into a long shape by an extruder or the like, a rubber or various metals. TECHNICAL FIELD The present invention relates to a molded product optical detection device used for detecting appearance abnormality or the like of a molded product.

[Prior Art] As a conventional optical detection device for this type of molded product, there is a technology of an optical appearance detection device for an extruded product shown in FIG.

FIG. 4 is a schematic view showing a conventional optical detection device for molded articles.

In the figure, 1 is an extruder, 2 is the extruder 1
The molded product 3 is extruded into a long shape, 3 is a ring-shaped support member disposed so as to surround the molded product 2 in the vicinity of the extruder 1, 4 is a light source, 5 is a light source 4 A plurality of optical fibers connected between the support member 3 and the optical fiber 6;
Exposed on the front of Reference numeral 7 denotes a plurality of television cameras arranged around the molded product 2 between the support member 3 and the extruder 1. Reference numeral 8 denotes a housing for accommodating the television camera 7, and reference numeral 9 denotes a housing attached to the housing 8. I'm a fan.

In the conventional optical detector for molded articles configured as described above, as shown by a chain line arrow in FIG.
Is emitted from the light emitting portion 6 of the optical fiber 5 toward the molded product 2 immediately after extrusion molding, and the reflected light from the molded product 2 is received by a plurality of television cameras 7. Then, the image information received by the television camera 7 is input to an abnormality determining device (not shown), and the external abnormality of the molded article 2 is detected. The detailed configuration and operation of the abnormality determination device are described in Japanese Patent Application No.
See the description and drawings of 269848.

Further, since the fan 9 is installed in the television camera 7, the gas G generated from the molded article 2 immediately after the formation by the rotation of the fan 9 is diffused around and adheres to the lens of the television camera 7.

[Problems to be Solved by the Invention] However, in the conventional optical detection device for molded articles, the television camera 7 is controlled by the fan 9.
The gas G adheres to the lens and the gas G blown off by the fan 9 adheres to the light emitting portion 6 of the optical fiber 5 exposed on the side surface of the support member 3.
In particular, when a plastic fiber is used as the optical fiber 5, the plastic fiber is deteriorated by the gas to which the plastic fiber adheres, so that the amount of light passing therethrough is reduced and the detection ability is reduced. Further, when a glass fiber bundle is used. The gas enters the gap between the fibers and is fixed,
A maintenance operation for polishing the light emitting unit 6 to remove the solid content is required.

As another prior art, there is a technique described in JP-A-59-147762. This publication discloses an optical detection device including light emitting means for irradiating an object to be measured and light receiving means for receiving reflected light from the object to detect the state of the object. However, the technology described in this publication is
It is necessary to perform air purging from both the light emitting unit and the light receiving unit, and there is a problem that energy loss is increased. In particular, if the entire condition around the extruded product is analyzed, there is a problem that an apparatus for performing the air purge becomes large and energy loss increases.

In addition, the technology described in Japanese Utility Model Laid-Open No. 52-33063 as a prior art is to form an air flow between the object to be measured and the light emitting means, and the tip of the light emitting means and the light receiving means becomes dirty. It discloses a technique that makes it difficult to do so. However, the technique described in this publication, although the light emitting means and the light receiving means are optically coupled, cannot be used for detecting the surface of a work.

Therefore, the present invention can prevent the gas from adhering to the light emitting means, maintain a high appearance detection ability, can save the trouble of the maintenance work, and furthermore, the optical device of the molded article can be configured compactly. It is an object of the present invention to provide a type detection device.

[Means for Solving the Problems] In order to solve the above-mentioned problems, an optical detection device for a molded article of the present invention comprises a light emitting device arranged in a ring shape so as to irradiate the entire periphery of the sent molded article with light. Means, a ring-shaped support means disposed near the molded article, supporting a light-emitting portion of the annularly arranged light-emitting means, and allowing the sent molded article to pass through the inside thereof; and Air ejecting means disposed on the means for forming an air flow between the light emitting portion of the light emitting means arranged in the annular shape and the peripheral surface of the molded article; and forming an air flow on the peripheral surface of the molded article. And a television camera that receives the reflected light from the molded article and detects the state of the molded article.

[Operation] According to the optical detection device for a molded article of the present invention, an air flow is ejected from the vicinity of the light-emitting portion by the air ejection means.
The gas generated from the molded product immediately after molding is carried away by the jet air flow in a direction away from the light emitting portion, and as a result, the gas is securely prevented from adhering to the light emitting portion. Also,
Since the air jetting means is incorporated in the support means for supporting the light emitting section, it is not necessary to secure a special space for air flow jetting, and the entire apparatus is configured compact.

[Example] Hereinafter, an example that embodies the present invention will be described.

FIG. 1 is a partially cutaway front view showing an optical detection device for molded articles according to a first embodiment of the present invention, FIG. 2 is a side view showing a support member of the optical detection device of FIG. 1, and FIG. FIG. 7 is a partially cutaway front view showing a support member of the optical detection device for molded articles according to the second embodiment of the present invention. In the drawings, the same reference numerals as those of the conventional example denote the same or corresponding components as those of the conventional example, and duplicate description will be omitted.

<First Embodiment> In FIGS. 1 and 2, reference numeral 11 denotes a ring-shaped support member installed near the television camera 7, and has an insertion tube 12 through which the molded product 2 immediately after extrusion molding is inserted. 1st ring
13, a second ring 15 with a mounting bracket 14,
An intermediate ring 16 is provided between the second ring 15 and the first ring 13.

A support hole 17 through which the optical fiber 5 is inserted and supported is formed continuously in the first ring 13 and the intermediate ring 16 at a predetermined angle with respect to the transfer direction of the molded product 2. On one side of the intermediate ring 16 where the light emitting portion 6 at the tip of the optical fiber 5 is exposed, the optical fiber 5
The inclined surface 19 is formed so as to be orthogonal to the axis. A set screw 18 for holding the optical fiber 5 is screwed to the first ring 13. The angle of inclination of the optical fiber 5 is appropriately set according to factors such as the type of the molded product 2 and the shape of the flaw.
Is a hose and if it detects scratches on its surface,
The angle of the shadow is preferably about 15 degrees.

On the other hand, the inner diameter of the intermediate ring 16 is set slightly larger than the outer diameter of the insertion tube 12 of the first ring 13, so that the light emission of the optical fiber 5 is provided between the intermediate ring 16 and the insertion tube 12. A first air ejection portion 21 for ejecting an air flow parallel to the molded article 2 from near the inside of the portion 6 is formed. Reference numeral 22 denotes an air hose connection portion formed on the side surface of the first ring 13 so as to supply an air flow to the first air ejection portion 21.

A large number of slits 23 are annularly arranged on the inner peripheral surface of the second ring 15, and the open ends of the slits 23 that are not closed by the intermediate ring 16 are close to the outside of the light emitting unit 6 of the optical fiber 5. And a second air jetting portion 24 for jetting an air flow orthogonally to the molded product 2 from the above. 25 is the second
The second ring 15 is provided so that air can be supplied to the air ejection section 24.
Is an air hose connection portion formed on the outer peripheral surface of the air hose.

An air cleaner that includes an air dryer, an air filter, an oil mist separator, and the like is connected to an air flow source that supplies an air flow to the second air ejection unit 24 and the first air ejection unit 21. It is desirable to remove components that adversely affect the image information of No. 7 in advance.

Next, the operation of the optical appearance detection device for an extruded product of the first embodiment configured as described above will be described.

The appearance detection operation of the molded article 2 in the first embodiment is the same as that of the conventional example. Light emitted from the light emitting section 6 of the optical fiber 5 is reflected by the molded article 2 immediately after extrusion molding, and the reflected light is reflected. Light is received by a plurality of television cameras 7, and the appearance abnormality of the molded article 2 is detected by the abnormality determination device based on the image information.

However, in the optical detection device for molded articles according to the first embodiment, unlike the conventional apparatus, during the appearance detection operation of the molded article 2, the first air is supplied from the air source via the air hose connection parts 22 and 25. An air flow is supplied to the ejection section 21 and the second air ejection section 24. Then, the molded product 2 is sent from the first air ejection portion 21 located near the inside of the light emitting portion 6 of the optical fiber 5.
The air flow is ejected in parallel to the
An air flow is ejected orthogonally to the molded article 2 from a second air ejection portion 24 located near the outside of the molded product 2. Then, the air flow from the first air ejection unit 21 and the air flow from the second air ejection unit 24 merge, and in front of the light emission unit 6, as shown by a solid arrow in FIG. 6, an airflow is formed along the molded product 2 and extending toward the extruder 1. Therefore, the gas G generated from the molded article 2 immediately after molding under the pressure of the air flow
Is carried away in a direction away from the light emitting unit 6, and as a result,
The attachment of gas to the light emitting section 6 is prevented.

As described above, the optical detection device for molded articles according to the first embodiment uses the optical fiber 5 as a light emitting means for irradiating the molded article 2 extruded from the extruder 1 with light.
A television camera 7 as light receiving means for detecting the appearance of the molded article 2 by receiving reflected light from the molded article 2; and a light emitting unit 6 of an optical fiber 5 near the television camera 7.
And a ring-shaped support member 11 as support means having an insertion tube 12 through which the molded article 2 is inserted.
And air ejecting means disposed on the support member 11 for ejecting an air flow from the vicinity of the light emitting section 6, wherein the air ejecting means is parallel to the molded article 2 from near the inside of the light emitting section 6. A first air ejection section 21 for ejecting an air flow to the outside, and a second air ejection section 24 for ejecting an air stream orthogonally to the molded article 2 from near the outside of the light emitting section 6.

Therefore, in the first embodiment, the air flows jetted from the first air jetting section 21 and the second air jetting section 24 join to cover the light emitting section 6 and move along the molded article 2 toward the extruder 1. Since the air stream is extended,
Gas is reliably prevented from adhering. As a result, when a plastic fiber is used as the optical fiber 5, the plastic fiber is not likely to be degraded by gas, and can always maintain a stable amount of transmitted light, exhibit a high appearance detection capability, and exhibit a glass fiber Even when the bundle is used, there is no possibility that the gas enters the gap between the fibers and is solidified, and the maintenance work such as the polishing of the light emitting unit 6 as in the related art can be omitted.

In particular, in this type of embodiment, when the air flow of the first air ejection portion 21 is increased and its shutoff capability is enhanced, the pressure around the light emitting portion 6 becomes negative, and as a result, the Although the generated gas G adheres to the light emitting portion 6 itself, the air flow ejected from the second air ejecting portion 24 forms an airflow on the front surface of the light emitting portion 6. Even if the flow is accelerated, the gas G generated from the molded article 2 is not
Can be prevented.

Further, a support member 11 for supporting the optical fiber 5 is provided.
Since the first air ejection part 21 and the second air ejection part 24 are incorporated in the extruder 1, there is no need to secure a special space for air flow ejection in a relatively narrow place around the extruder 1. The whole can be made compact. If the pressure of the air flow ejected from the first air ejection unit 21 and the second air ejection unit 24 is set to be large, the gas G around the television camera 7 is also purged. The fan 9 can be omitted, and this also contributes to space saving.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 3, members common to the first embodiment, such as a television camera, are omitted.

The support member 29 of the second embodiment includes an outer plate 31 having an insertion tube 30 through which the molded product 2 is inserted, an inner ring 33 forming an air ejection portion 32 between the insertion tube 30, and the inner ring 33. An outer ring 35 forming an inclined fiber support portion 34 between the outer ring 35 and a spacing plate 36 for maintaining a space between the outer ring 35 and the inner ring 33. A UV filter 37 is provided in front of the fiber support portion 34 so as to cover the light emitting portion 6 of the optical fiber 5.
And a pair of inner and outer O-rings
It is held from inside by 40 and 41. Reference numerals 42 and 43 denote O-ring retainers, respectively. Reference numeral 44 denotes a connection tube protruding from the outer peripheral surface of the support member 29, and includes an optical fiber 5
Stainless steel flexible tube through
45 is connected.

Thus, the apparatus for detecting the appearance of an extruded product according to the second embodiment includes an air ejection unit including the air ejection unit 32 that ejects an air flow from the vicinity of the inside of the light emitting unit 6 to the molded product 2 in a parallel manner, This is different from the first embodiment in that a UV filter 37 that covers the light emitting section 6 and a flexible tube 45 into which the optical fiber 5 is inserted are provided.

Therefore, in the second embodiment, the gas G generated from the molded article 2 immediately after molding by the air flow jetted in parallel to the molded article 2 from near the inside of the light emitting section 6 emits the gas G.
The gas is carried away in the direction away from the UV filter 37, and the adhesion of gas to the UV filter 37 is suppressed. Further, even when the gas is recirculated to the support member 29 side, the UV filter 37 reliably prevents the light emitting unit 6 from being stained. Further, unlike the first embodiment, since a large number of optical fibers 5 are inserted through the flexible tube 45, workability in a relatively narrow space near the extruder 1 is improved. Other functions and effects are the same as those of the first embodiment.

By the way, in each of the above embodiments, the support member 11 and the support member 11 are provided so that the light emitting portion 6 of the optical fiber 5 can be annularly supported.
29 is configured in a ring shape, but the present invention is not limited to this, and the supporting member may be appropriately deformed according to the shape of the molded product 2 and the position of the detection surface thereof. It is possible to configure. However, when the ring-shaped support members 11 and 29 are used, the entire surface of the annular molded product 2 such as a hose is illuminated with light, and the effect of efficiently detecting the appearance abnormality on the entire surface can be obtained.

In each of the above embodiments, the ring-shaped support member 11 and
Although the air ejection portions 21, 24, and 32 are provided in a ring shape in 29, the arrangement of the air ejection portions can be appropriately changed according to the shape deformation of the support member described above.

Furthermore, a plurality of television cameras 7 as light receiving means are arranged around the molded product 2. However, the present invention is not limited to this, and the appearance of only one surface of the molded product is not limited to this. In the case of detection, one television camera, one-dimensional element or two-dimensional element, photodiode, phototransistor or the like can be used as the light receiving means. But,
In the case where the ring-shaped support members 11 and 29 are used, as in the case where a plurality of television cameras 7 are arranged around the molded article 2, the external appearance abnormality of the entire molded article 2 can be efficiently detected. Is obtained.

That is, in each of the above embodiments, the light receiving means and the light emitting means are constituted by a combination of the television camera 7 and the optical fiber 5. However, the present invention is not limited to this. It can be implemented by a combination of a CCD camera with a halogen lamp, a combination of a CCD camera without a shutter and a strobe, or a shutter when the appearance is detected when a molded article is transferred or stopped. None A combination of a CCD camera and a halogen lamp is also possible.

The support means provided near the molded article of the above embodiment and supporting the light emitting portion of the light emitting means may have any general shape as long as the annular shape is formed so that the molded article is located at the center position. . Air blowing means, which is provided on the support means and forms an air flow between the light emitting portion and the molded article, has a schematic shape along an annular indicating means formed so that the molded article is located at the center position. It was formed.

In addition, although the molded article sent out has been described as a molded article of a synthetic resin extruded from an extrusion molding machine,
In practicing the present invention, a molded article such as rubber or various metals can be used.

[Effects of the Invention] As described above, the optical detection device for a molded article of the present invention
The light-emitting portion of the light-emitting means disposed in the vicinity of the molded article and arranged in a ring so as to irradiate the entire periphery of the sent molded article is supported, and the emitted molded article passes through the inside thereof. Air ejecting means arranged on the ring-shaped support means to form an air flow between a light emitting portion of the annularly arranged light emitting means and a peripheral surface of the molded product; and a peripheral surface of the molded product. And a television camera for detecting the state of the molded article by receiving the reflected light from the molded article in which the air flow is formed, so that the gas generated from the molded article immediately after molding is ejected by air. Carrying away from the light-emitting part by the airflow from the air, it can prevent gas from adhering to the light-emitting part, thereby maintaining a high ability to detect the appearance of the molded product and reducing maintenance work. Light emitting part and air Incorporating both the means can comprise the entire device compact.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an optical detection device for molded articles according to a first embodiment of the present invention, FIG. 2 is a side view showing a support member of the optical detection device of FIG. 1, and FIG. FIG. 4 is a partially cutaway front view showing a support member of an optical detection device for a molded product according to a second embodiment of the present invention, and FIG. 4 is a schematic view showing a conventional optical appearance detection device for an extruded product. In the drawing, 1: extrusion molding machine, 2: molded product 5: optical fiber 6: light emitting section, 7: television camera 11: support member, 21: first air ejection section 24: second air ejection section, 29: support member 32: Air ejection section. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masataka Tanahashi 1 Ochiai Nagahata, Kasuga-mura, Nishikasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (56) References JP-A-56-72308 (JP, A) JP-A Sho 59-147762 (JP, A) JP-A-62-277512 (JP, A)

Claims (1)

(57) [Claims] 1. A light emitting means arranged in an annular shape so as to irradiate the entire circumference of a molded article sent out, and a light emitting portion of the light emitting means arranged in the vicinity of the molded article and arranged in an annular shape. And a ring-shaped support means for passing the molded article through the inside thereof, a light-emitting portion of the light-emitting means provided in the support means and annularly arranged, and a peripheral surface of the molded article. An air jetting means for forming an air flow along the molded product; receiving reflected light from the molded product having an air flow formed on a peripheral surface of the molded product, and detecting a state of the molded product. An optical detection device for a molded article, comprising: a television camera that detects