JPS58123164A - Detector for marked part of tube material of wire - Google Patents

Abstract

PURPOSE:To detect an automatic and highly efficient detection of an ink marked part with no malfunction in the consecutive manufacturing process of a long-size tube material of the wire, by receiving and detecting the irregularly reflected beams at the marked part by at least one of photodetectors to projectors. CONSTITUTION:The beams are irradiated intermittently to a travelling tube material of the wire 8 from projectors 2, 4 and 6 set at the 1st position. That is, the irregularly reflected beams are made incident to photodetectors 12, 14 and 16 set at the 2nd position by projecting beams alternately in an extremely short time and in order of projectors 2, 4 and 6. The irregularly reflected beam is delivered to a length deciding circuit 38 from a discriminating circuit only in case the reflected beam is higher than a prescribed level. The circuit 38 delivers a detecting signal only when an output has a continuous change longer than a prescribed period of time. Then a defect eliminating device is actuated on the basis of the detecting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mark/heat detection device for FH pipe materials, and in particular to a device for optically and automatically detecting ink marks applied during the continuous manufacturing process of long linear or bone structures. 1.

From Yakirai, continuous stretching, (tube stretching) processing, painting, and handling of long wire rods or bone structures (hereinafter collectively referred to as wire tube materials)]
-Alternatively, when carrying out internal groove groove I (1) work, etc., mark the defective part that occurs in the wire pipe material with ink, etc., and then detect the defective mark part with 11 vision and check the sound. The 13 minutes were removed manually.

However, visual detection by the operator has the disadvantage that there is a high risk of oversight and automatic sorting cannot be performed, and it goes against the labor-saving trend demanded by the times, so it cannot be expected to improve work efficiency. there were.

In addition, in order to eliminate such drawbacks, when attempting to use an optical sensor equipped with a light emitter and a light receiver, the conventional light emitter and receiver utilize specularly reflected light for discrimination. However, in the case of sensitive detection, there is a tendency to judge the four parts of the material, fluctuations in trade (shake! 10), or defects in Table 1II as ink marks. There is a possibility that the product may be treated as a good product, and therefore the reliability of the device may not be sufficient. 1
Therefore, it was extremely difficult to perform highly efficient operation.

Here, the present invention 1 has been developed in view of the above circumstances, and is an optical method using diffused reflected light to remove ink marks artificially applied during the continuous manufacturing process of long wire tube materials. It is an object of the present invention to provide a device that can detect automatically and efficiently using a sensor without malfunction.

In order to achieve this object, the mark detection device for a wire tube according to the present invention is a device for detecting a mark portion attached to a wire tube running in the longitudinal direction. a first position in a direction perpendicular to the fineness;
A projector is placed at either one of the first position and a second position located at a predetermined angle of inclination on the meticulous side from the first position in a plane including the minute center, and a light is projected from the projector onto the wire tube material at the other. A set of light emitting/receiving means each having a light receiver arranged to receive the diffusely reflected light of the emitted light is placed around the wire tube material, and the light emitting/receiving means responds to the light emitted from each light emitter. The present invention is characterized in that the diffusely reflected light at the WIJ recording tube tube section is received and detected by at least one of the light receivers for each light projector.

Thus, according to the present invention, since the present device employs an optical sensor that receives diffusely reflected light, it is relatively unaffected by ambient light, and it is also possible to detect the gloss of the mark, the cloudiness of the striking surface, etc. It is no longer affected by material fluctuations (vibrations),
Therefore, there is no longer the risk of the conventional sensor being too sensitive and causing malfunctions.

In addition, a plurality of sets of light emitting/receiving means are provided around the wire tube material to receive and detect the light reflected from the tube hole.
Even marks applied to only one side of the material can be reliably detected, and non-contact automatic sorting can be performed accurately and quickly, resulting in excellent labor-saving and work efficiency effects. Hereinafter, in order to clarify the present invention more specifically, an example of the apparatus for detecting a mark portion of a wire tube material according to the present invention will be explained in detail based on the drawings.

First, in FIGS. 1 and 2, reference numerals 2, 4, and 6 are independent projectors, and the axial center of the wire tube 8, which is made to run in the longitudinal direction, is located on a plane perpendicular to the axial center IO. 10
On the same circumference centered at , the optical axis is directed toward the axis lO, and is fixed at a first position forming an included angle of 120 degrees with each other.

On the other hand, the light receivers 12, 14, and 16 are connected to the light emitting device 62, respectively.
．． 4 and '6, making a total of 8 sets of optical sensors 18 (
The light emitting/receiving means) is arranged at a distance 1 from the first position within a plane including the first position and the axis 10.
They are each fixed at a second position having an inclination angle of a-40 to 60 degrees on the 0 side.

In addition, here, the light emitter 2.4.6 and the light receiver 12.1
As a control circuit for 4.16, an intermittent alternate light emitting/receiving circuit is provided in order to prevent malfunctions due to interference from other projectors. As shown in FIG. 3, three sets of optical sensors 18 are used alternately over time for a certain period of time, for example, 10 m s.
Ordinary electricity i that can operate sequentially for a time longer than ec
Il! A circuit has been added. Of course, the operating time of each set of optical sensors 18 is set according to the traveling speed of the wire tube material 8.

However, if the running speed of the partner is extremely fast, the influence of the inoperative time becomes large and may be inconvenient. If necessary, a measure will be adopted in which each set is installed not on the same circumference but at positions shifted in the material axis direction.

In addition, for the output from the light receiver 12.14.16,
As shown in FIG.
A detection circuit 40 consisting of a length determination circuit 88 and the like is installed. This detection circuit 40 detects light receiving '#? i12
．． 14. Compare the output changes from 16 with the respective set levels, and make a judgment only if the output changes are above the predetermined level 8
2, the respective discrimination circuits 3
2. The light receiver 12.14.16 identified by either
The change time of the output change is compared with the time set by the timer 86, and if the change continues longer than the set time, the length determination circuit 88 outputs a detection signal.

Although not shown, the effective field of view of the optical sensor 18 is set to be relatively large, equal to or larger than the diameter of the wire tube material 8, and is of a far-focus type. This is because defocusing the light without concentrating it produces good results in preventing the harmful effects of high sensitivity.

Further, it is desirable that the wavelength sensitivity characteristics of the light receivers 12, 14, and 16 have a sensitivity peak near near-infrared. This is to prevent the signal from being disturbed by external light such as electric lights or external light.

Moreover, the timer 36 and length determination circuit 38 are provided to prevent spot-like dirt on the surface of the wire tube material 8.

This is to prevent malfunctions that may occur due to the presence of marks.

In the mark detection device configured in this manner, light is intermittently and alternately projected from the light projector 2.4.6 at the first position toward the running wire tube 8. That is,
For example, by emitting light alternately for a very short time in the order of emitters 2.4.6, the receiver 12.1 in second place can be
4. Diffusely reflected light is incident on 16. Even if the mark 842 exists only on a part of the surface of the wire tube material 8, since light is projected around the kWWB 2 from eight directions, any of the lights will illuminate the mark portion 42 and reveal its presence.

This diffusely reflected light is excluded when it is below a predetermined level, and only when it is above a predetermined level, it is outputted from one of the respective discriminating circuits 32 to the length determining circuit 38. Cases where the output changes within this range are excluded, and only cases where the output changes continue longer than that are output as a detection signal. Then, based on this detection, a defect removal device or the like is activated to effectively carry out automatic cutting or the like.

In this way, since this embodiment is of the diffusely reflected light receiving type, it is not affected by the gloss of the mark portion 42, the roughness of the material surface, etc.; 14, 16 etc. has a large effective field of view and is of a far-focus type, it is possible to reduce changes in the amount of received light due to vibrations of the wire tube material 8, and it is possible to prevent malfunctions. Therefore, fI! The risk of malfunction due to too much Ie sensitivity was also effectively eliminated.

Furthermore, since eight sets of optical sensors 18 are provided around the wire tube material 8 to receive diffusely reflected light and automatically detect it, even marks applied only on one side of the wire tube material 8 can be reliably detected. In addition, there is no longer any risk of oversight, which is the case with visual inspection.

By installing the length determination circuit 38, the wire tube material 80
It is no longer possible to detect single short changes in light such as smudges or dents in the surface of the surface, and it has become possible to carry out accurate and quick automatic sorting without contact, resulting in labor savings and improved work efficiency. In addition, the emitter 2.4.6 and receiver 12 of this equipment
．． Since the 14.16 has the feature that an inexpensive general-purpose type can be used, it also has the advantage of being smart and inexpensive to manufacture.

In the above embodiment, in order to effectively receive the diffusely reflected light, the light projector 2.4.6 is placed in the first position, and the light receiver 12.14.16 is placed in the second position. In addition, although the inclination angle is set to 40 to 60 degrees, the present invention is not limited to this in any way, and may be arranged in the opposite direction.In short, either the $1 position or the second position may be used. The projector may be placed on one side and the light receiver may be placed on the other side, and the included angle between the first position and the second position may be outside the range of 40 to 60 degrees. Furthermore, the number of emitters and receivers is limited to eight sets as in the above embodiment.
Generally, it is sufficient to have multiple sets.

Furthermore, each emitter and each light receiver were arranged on the same separate circumference centered on the fine center of the thin tube material, but as described above, the optical sensors were arranged offset in the axial direction of the wire tube material. It is also possible to do so. In addition, intermittent alternate light emission and reception [! l! A detection circuit including a detection circuit, a discrimination circuit 32, a length judgment circuit 38, etc. is provided, and the optical sensor 8 can expand the effective field of view, adopt a fast focusing type, and change the wavelength of the sensitivity characteristic having a sensitivity peak near the near infrared. Although we have shown an example in which such methods are adopted, some or all of these may be omitted depending on the situation.

In addition, it goes without saying that various modifications and improvements can be made to the present invention based on the wisdom of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a top view showing an embodiment of the mark detection device on the wire tube side according to the present invention, and FIG. 2 is a top view of the right side 11 thereof.
The third figure is an explanatory diagram of the construction side of the intermittent alternating light emitting and receiving circuit, and the fourth figure is the block of the light receiving supervisory control En-Ayu.
It is. 2.1.4.6: Floodlight 8: Thin tube material 10: Axis
12.14.16: Photoreceiver 18: Optical sensor (
Light emitting/receiving means) 30 Two-level setter 32; Discrimination circuit 38: Length determination circuit 40: Detection circuit 42: Mark section applicant: Sumitomo Light Metal Industries, Ltd.

Claims (1)

[Scope of Claims] (1) A □ device for detecting a mark portion given to a wire tube running in the longitudinal direction, and a first position in a direction perpendicular to the fine details of the wire tube; A floodlight is placed on either one of the first position and a second position located at a predetermined inclination angle on the side of the fissure from the first position in a plane including the fissure, and a light source is attached to the other side from the floodlight to the wire tube material. The receivers that receive the diffusely reflected light of the projected light are rA+l k
A plurality of sets of light emitting/receiving means consisting of at least one light emitting/receiving means are provided around the wire tube material, and the diffusely reflected light at the mark M. A mark part detection device for a wire tube material, characterized in that at least one of the light receivers receives and detects light. (21FjlJ Several widths, several widths) Each of the projectors and the receivers of the light means are arranged on separate and identical circumferences centered on the axis of the wire tube material, as set forth in claim 1. (3) The light emitter of the light emitting/receiving means is disposed at the first position, and the light receiver is disposed at the second position, and the angle of inclination of the light receiver with respect to the light emitter is 40 to 60°. The device according to claim 1. (4) A discrimination circuit that compares and discriminates the output change from the light receiver of each of the light emitting and receiving means described in mjf with a respective set level, and each discrimination circuit. Claims 1 to 4 have a detection circuit including a mark length determination Ll:!l sweetfish that determines the output change of the light receiver determined by any of the change time and outputs a mark signal. Attachment as described in any of Section 8.