AN ILLUMINATION SYSTEM FOR SURFACE INSPECTION OF HOT-ROLLED METAL STRIP IN A HOT STRIP MILL

摘要

The invention relates to an illumination system for surface inspection of hot rolled metal strip in hot strip mill, the hot strip mill having a roller table conveying the metal strip, a roller grider with a plurality of rollers disposed below the roller table, a c-notch to allow the illumination system to be inclinedly mounted, and a host computer connected through a fibre optic communication cable to the illumination system, the system comprising a plurality of power light emitting devices (LEDs) forming an array and installed inside a first box which is housed inside a second pressurized box, the second box internally accommodating several metallic tubes circulating chilled water for heat dissipation; a thin high conductive layer disposed at the interfacing surface of the first box and the metallic tubes, wherein the second box is mounted below the roller table on the roll girder conveying said roll strip, wherein the positional relationship of the light array with respect to a camera is maintained such that the LEDs are enabled to project a beam of light on the rolled strip surface at a high speed, and wherein the host-computer of the mill communicates with a micro-controller disposed under the first box having the light source, via a fibre optic communication interface disposed for controlling illumination level to achieve a desired dynamic detection level and contrast into the camera.