An online detection and adjustment system for plate thickness based on laser ultrasonic

Abstract

An online sheet thickness detecting and adjusting system based on laser ultrasonic comprises a sheet rolling mechanism and an online sheet thickness detecting mechanism; the sheet rolling mechanism comprises an upper roller, a lower roller, an adjusting mechanism for the distance between the upper roller and the lower roller and a PLC controlling system; the online sheet thickness detecting mechanism comprises an optical path system assembly, a high temperature detecting meter, a data collecting system assembly and a data processing system assembly. The data processing system assembly can convert bipolar signals with aliasing peak values and complex background noise into unipolar signals with clear peak values and small background noise, time for the longitudinal wave and the horizontal wave to reach an O point on the upper surface of a sheet at the first two times can be obtained accurately, the sheet thickness value can be calculated out, the measured sheet thickness value is compared with a preset sheet thickness value in the PLC controlling system, the PLC controlling system can send forward rotation / reversed rotation moving instructions to a servo motor, the distance between the upper roller and the lower roller can be adjusted, and the sheet thickness value can be identical with the preset sheet value.

Description

technical field [0001] The invention belongs to the field of plate processing and manufacturing, and in particular relates to a plate thickness detection and adjustment system based on laser ultrasound. Production deviation to ensure the uniformity of plate thickness. Background technique [0002] In the actual industrial production process, the uniformity of plate thickness is an important indicator, which is directly related to the amount of subsequent processing, affecting the final product yield and overall processing cost. It is very important for the thickness uniformity of the plate to be able to quickly and accurately detect the thickness value of the plate online, and to be able to adjust the process flow in time according to the test results. Due to the rough surface, unevenness, and unstable temperature of industrial production plates, and the working environment is usually extreme environments such as high temperature, strong corrosion, and high radiation, gener...

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Problems solved by technology

In such cases, there is a large error in obtaining the thickness value of the plate by using the laser receiver, signal converter, etc. to find the deviation value of the reflected laser angle. Perhaps this method is applicable to the field of thickness measurement of optical components, but due to the fact that industrial production of plates is often The surface is rough, uneven, and the temperature is unstable. Therefore, this method has a large error for the thickness measurement of industrial production plates, so it is not a reasonable choice.

Moreover, the basic components of this type of device include laser transmitters, laser receivers, photoelectric signal converters and other equipment. The cost of these three types of equipment is relatively high, and the overall equipment cost is not optimistic.

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