DE102008050598A1 - Media detecting system for use during lubrication of e.g. steel strip in steel industry, has evaluation device evaluating spectra of transmitted and reflected light detected by sensors, where sensors and collecting lens form movable unit - Google Patents

Abstract

The system has a collecting lens (4) for collimating a light e.g. UV light, reflected by a media that is irradiated with the light. A sensor (2) detects the transmitted light. Another sensor (3) detects the collimated light reflected by the media. An evaluation device is provided for qualitative and quantitative evaluation of spectra of the transmitted and reflected light detected by the sensors. The sensors and the collecting lens form a movable unit.

Description

The The present invention relates to a system for detecting various Media and dry areas on surfaces, for example when oiling Steel strips, also called steel coils, in the steel industry.

The state of the art is that the coil is oiled with an electrostatic oiling machine. In this case, by means of a located at the top and by means of a located on the underside of the steel strip bar, is attracted to the surface of the steel strip from the oil due to the electrostatic charge of the steel strip. The steel strip is usually oiled in the longitudinal direction, referred to below as the process direction. The amount of media or amount of oil is adjusted depending on the oil pressure desired by the customer. The oil layer is usually given in g / m ² (grams per square meter).

adversely in these known in the art Einölmaschinen is that due of blockages in the bars dry, so oil-free, stripes or areas remain. In these areas, the quantities of media or quantities of oil are softening the steel bands from the customer's specification. They can also differ from previous ones Work remaining emulsions (water-oil mixtures) are on the tape, the too undesirable irregularities in the oil layer to lead. For such irregularities, as well as in the aforementioned of the customer specifications deviating and especially oil-free and only areas wetted with emulsion are process defects. Such process errors reduce the quality of the steel coils to be processed.

Of the Invention is the object in view of this prior art based on providing a system of the aforementioned type, which one fastest possible Detecting the mentioned process errors allows.

to technical solution This object is achieved according to a system for detecting the Process error provided.

The This invention uses the physical phenomenon of the targeted Fluorescence off.

The Fluorescence is caused by irradiation of the surface Medium, for example of oil, excited with light, wherein the wavelength of the light advantageously in the ultraviolet range, ie from about 200 nm to about 380 nm lies. If the emitted UV light hits a medium, such as oil, it will dependent on from the medium and the amount of medium applied, a part of the emitted UV light (fluorescence), the rest Part is reflected.

The inventive system has advantageously over at least two sensors. By means of the sensors, the degree of Fluorescence, caused by the irradiation with UV light is determined.

to Determining the degree of fluorescence takes at least one sensor the spectrum of the emitted UV light. The reflected part of UV light is bundled, preferably by a condenser lens, and its spectrum by the recorded at least one other sensor. An evaluation device calculated using the one determined by the at least two sensors Data the ratio Spectrum of the emitted UV light to spectrum of the reflected UV light. According to the invention, due this relationship the nature of the process error will be determined.

Lies as a process error, a deviation of the media quantity from the customer specification before, that's how it works by means of the evaluation unit, the amount of media for the corresponding area determine.

In In a particularly advantageous embodiment, the UV light source, the sensors and the condenser preferably. on a holder mounted, which is reversibly moved transversely to the process direction. The movement is parallel to the surface. Based on the respective Position of the holder transversely to the process direction can be advantageously the local Locate the location of the process error.

By means of the system according to the invention it is thus advantageously possible to avoid process errors, which in particular leads to the quality of the steel coils to be processed being improved for further processing, in particular for deep drawing or pressing of motor vehicle parts. Further details, features and advantages of the invention are apparent from the drawing of a basic embodiment of the invention ( 1 ).

1

UV-light source

2

sensor 1

3

sensor 2

4

converging lens

5

holder

6

crossbeam above

7

crossbeam below

8th

steel coil

9

Media support surface

Claims (1)

System for detecting media on surfaces, characterized by an irradiation of the media with light (UV light), a bundling of the light reflected from the media, preferably by means of a Converging lens, a detection of the emitted light (UV light) by means of at least one sensor, a capture of the media reflected, bundled Light (UV light) by means of at least one further sensor, at least one Evaluation device for qualitative and quantitative evaluation the detected by the sensors spectra of the emitted and the reflected light (UV light), wherein at least the sensors and the converging lens form a movable unit.