JPH05157705A - Abnormality diagnosis method of gear etc. - Google Patents

Abstract

PURPOSE:To enable abnormality of a gear, etc., in use to be detected by casting a parallel light to a surface to be inspected of a gear, etc., performing image processing of the reflection light and projecting it on a monitor screen, and then comparing it with a shaded pattern when it is normal. CONSTITUTION:Monitoring means 2-5 with a light-emitting equipment 10 which casts a parallel light 9 and a photo detector 12 which detects the reflection light 11 are provided near a gear 1 and then the monitoring means 2, the monitoring means 3, and the monitoring means 4 and 5 monitor a gear surface 7a at a rotary direction side, a gear surface 7b, and both end faces 8a and 8b of the gear 6, respectively. The light-emitting equipment 10 and the photo detector 12 are connected to a computer with a monitoring device such as a CRT and then emits light and detects reflection light at a timing matching the number of gears and a rotary speed of the gear 1 under computer control. Then, a detection signal of the photo detector 12 is subjected to image processing and an image of each surface to be inspected is projected onto a monitor screen, thus enabling an amount of deterioration damage of machine elements during use to be detected in comparison with a normal case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality diagnosis method capable of detecting deterioration and damage of gears in use and accurately predicting their life.

[0002]

2. Description of the Related Art A method utilizing scattered light is known as a method for diagnosing the surface condition of an object to be inspected in a production line while the line is in operation. For example, light is applied from a certain direction to ball bearings that are successively transported on the line, and if the scattered light is different from the scattered light of a normal ball bearing, it is judged as a defective product and extracted from the transport line. The method to do is put to practical use.

[0003]

However, the above-mentioned conventional method is for sorting good products and defective products at the manufacturing stage of articles, and the gears actually incorporated in the apparatus as machine elements are used. A technique capable of detecting the degree of deterioration or damage over time has not yet been established.

The present invention was devised in view of the above circumstances, and an object thereof is to provide an abnormality diagnosis method capable of easily detecting an abnormality of a gear or the like actually used.

[0005]

In order to achieve the above object, in the abnormality diagnosing method of the present invention, a surface to be inspected such as a gear is irradiated with parallel light from a certain direction, and the reflected light is image-processed and monitored. It is displayed on the screen as a light-dark pattern, and the light-dark pattern is compared with the pattern at the normal time to detect the abnormality of the surface to be inspected.

[0006]

When the surface to be inspected is irradiated with parallel light from a certain direction, if the surface to be inspected has no defects such as scratches and wear, the light will have a normal shape (curvature, undulation, etc.). )
Is reflected in a certain direction. That is, the normal light scattering state peculiar to the surface to be inspected is shown. On the other hand, if there are even a few defects on the surface to be inspected, the light striking the defective portion is scattered at random, resulting in a scattering state different from the normal state. Therefore, the reflected light is image-processed and displayed as a light-dark pattern on the monitor screen, and the light-dark pattern is compared with the normal pattern to easily detect an abnormality on the surface to be inspected. You can

[0007]

Next, an embodiment of the present invention will be described.

FIG. 1 shows a gear 1 which is a component of a gear mechanism which is continuously operated for a long time. Since the gear 1 rotates while meshing with another gear (not shown), wear and deterioration / damage of chips and the like occur in the tooth portion over time.

Therefore, monitoring means 2 to 5 are provided in the vicinity of the gear 1 and both tooth surfaces of each tooth 6 (tooth surface 7 on the rotation direction side).
a, the tooth surface 7b on the side opposite to the rotational direction, and the shape or surface condition of both end surfaces 8a, 8b perpendicular to this are monitored. Each of the monitoring means 2 to 5 includes a light irradiator 10 that irradiates the surface to be inspected with parallel light 9.
And a photodetector 12 that detects the reflected light 11.
The light irradiator 10 and the light detector 12 are fixedly provided at predetermined positions near the gear 1. Then, each light irradiator 10 irradiates the rotating gear 1 with parallel light 9 from a certain direction, and each light detector 12 detects the light 11 reflected in a certain direction. The individual monitoring means will be described. The monitoring means 2 is for monitoring the tooth surface 7a on the rotation direction side, and the parallel light 9 is emitted from the certain direction to the tooth surface 7a and reflected in the certain direction. The light 11 is detected. The monitoring means 3 is for monitoring the tooth surface 7b on the side opposite to the means 2, and irradiates the parallel light 9 from the constant direction of the tooth surface 7b and detects the light 11 reflected in the constant direction. Further, the monitoring means 4 and 5 are for monitoring both end surfaces 8a and 8b of the tooth 6, and the end surfaces 8a and 8b are irradiated with the parallel light 9 from a certain direction and are reflected in a certain direction. 11 is detected. Although the parallel light 9 is represented by a thin line in FIG. 1, it is actually a uniform band-like light having a width or thickness such that each surface to be inspected such as a tooth surface can be collectively irradiated.

The light irradiator 10 and the photodetector 12 of each of the monitoring means 2 to 5 are a computer equipped with a monitor device such as a CRT.
It is connected to a computer (not shown), and under the control of the computer, light irradiation and detection of reflected light are performed at a timing matching the number of teeth and the rotation speed of the gear 1. And the photodetector 1
The detection signal 2 is image-processed by the computer, and as shown in FIGS. 2 and 3, the images of the respective surfaces to be inspected are projected on the monitor screen 13 as a bright and dark pattern 14 for a short time.

FIG. 2 shows an example of an image of the tooth surface 7a (or 7b) by the monitoring means 2 (or 3). (A) is a normal light and dark pattern, and (b) is a light and dark pattern when there is an abnormality. It is an example of As can be seen at a glance, spots (dark portions) 15 which are not in the pattern of (a) are present in the pattern of (b). This spot 15 is a tooth surface 7a (or 7
This is because the parallel light 9 radiated to the portion b) is deteriorated due to the presence of a damaged portion such as a scratch or abrasion, which is reflected in a random direction and is not detected by the photodetector 12.

FIG. 3 shows an example of an image of the end face 8a (or 8b) by the monitoring means 4 (or 5). (A) is a normal light / dark pattern, and (b) is a light / dark pattern when there is an abnormality. This is an example of In this example, the constriction (dark portion) 16 of the tooth profile image, which is not present in the pattern of (a), is present in the pattern of (b). In the constriction 16, the parallel light 9 radiated to the root portion of the tooth 6 due to the existence of a damaged portion such as a scratch or abrasion is reflected in a random direction or passes through as it is and the photodetector 12 It appears because it was not detected in.

In this way, the image of the surface to be inspected is displayed on the monitor screen as the light-dark pattern 14, and the light-dark pattern is displayed.
By comparing the pattern 14 with the normal pattern, it is possible to easily detect the degree of deterioration and damage of the main part of the gear 1 actually used. Therefore, according to this method, it is possible to accurately predict the life of the gear 1 based on the actual abnormality diagnosis result.

The object of abnormality diagnosis by the method of the present invention is not limited to gears. By slightly modifying the above-described embodiment, a tooth on the outer periphery of a rotating body (body) such as an axial flow device can be obtained. The present invention can be applied to all mechanical elements having protrusions such as blades and blades.

[0015]

In summary, according to the present invention, it is possible to easily detect the degree of deterioration and damage of a mechanical element that is actually in use, so that it is possible to accurately predict the life of the mechanical element.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment in which the method of the present invention is applied to abnormality diagnosis of gears.

FIG. 2 is a diagram showing a state in which a bright and dark pattern is displayed on a monitor screen.

FIG. 3 is a diagram showing a state in which a bright and dark pattern is displayed on a monitor screen.

[Explanation of symbols]

 1 Gear 7a Tooth surface (inspected surface) 7b Tooth surface (inspected surface) 8a End surface (inspected surface) 8b End surface (inspected surface) 9 Parallel light 11 Reflected light 13 Monitor screen 14 Bright / dark pattern

Claims (1)

[Claims] 1. A surface to be inspected such as a gear is irradiated with parallel light from a certain direction, and the reflected light is image-processed and displayed as a light-dark pattern on a monitor screen. The light-dark pattern and a normal pattern. The abnormality diagnosing method for gears and the like is characterized in that the abnormality of the surface to be inspected is detected by comparing with an error.