Sudden and self-excited vibration alarm device for sheet rolling mill

Abstract

The invention relates to self-excited vibration monitoring in the strip steel production process and discloses a sudden frequency tripling self-excited vibration alarm device for a sheet rolling mill. The sudden frequency tripling self-excited vibration alarm device comprises a vibration sensor and a speed sensor, wherein the vibration sensor is provided with a constant current source circuit which is sequentially connected with an electrostatic discharge (ESD) protection circuit and a highly dynamic range conditioning circuit and is connected with an isolating circuit through an anti-aliasing filtering circuit and an analog/digital (A/D) conversion circuit; a speed analog signal transmitted by the speed sensor sequentially passes through the ESD protection circuit, a radio frequency interference (RFI) filtering circuit and a speed signal conditioning circuit and is transmitted to the isolating circuit through the anti-aliasing filtering circuit and the A/D conversion circuit; a speed pulse signal of the speed sensor is input into the isolating circuit through the protection circuit and a shaping circuit; the output of the isolating circuit is connected with a microprocessor; and the microprocessor is connected with an upper computer which has calculation and audible and visual alarm functions by utilizing a remote fiber test system (RFTS) protocol. According to the device, the self-excited vibration and sudden strong resonance in the sheet steel rolling production process can be alarmed.

Description

technical field [0001] The invention relates to the monitoring of self-excited vibration in the strip steel production process, in particular to a detection and alarm device for sudden self-excited vibration of a thin-plate continuous rolling mill. Background technique [0002] The self-excited vibration of the rolling mill, especially the three-octave-band self-excited vibration is one of the main obstacles to the improvement of the output and quality of thin plate cold rolling. Compared with other self-excited or chattering phenomena, the three-octave self-excited vibration often occurs suddenly (or diverges), and quickly reaches the maximum amplitude of the self-vibration within a few seconds, resulting in the difference in the thickness of the surface of the rolled piece, sometimes Even cause the cold-rolled thin strip to break. In the production of thin-gauge products, due to the higher speed required by the process regulations, the possibility of chattering in the rol...

AI Technical Summary

Problems solved by technology

However, since the self-excited vibration of the rolling mill is a complex problem related to dozens of factors, it is impossible to completely suppress it, and the most urgent task is to provide a timely and beneficial reminder for the on-site operators to take correct and effective operations and save time for roll change Provide technical basis

Images