The Development And Study On Axial Force On-Line Monitoring System Of Mills

In order to resolve the puzzle of mill bearing shortened longevity, burning damage accidents and control roll system behavior, many kinds of research of theory and industrial experiment has been carried out recently. The roll system behavior of 2200 aluminum foil middle mill is complicate and out of control, it has been found axial lines crossed dynamic between work roll and brace roll,this is because there is assembling interspace existence between bearing support and frame slide in existing constrained condition. Therefore,this makes thrust bearing generate preternatural overload, load non-uniform and undulatory behaviour, and leads to thrust bearing shortened longevity and loss by burning. A series of mill vibration, tap-open etc damage accidents have been found out because of bad bearing support dynamic characteristic, lower natural frequency, this restrict high-speed rolling production. In order to diagnose thrust bearing dynamic loading characteristic of work roll and certify resulting, field test has been carried out in work roll thrust bearing.With the development and maturity of computerized technique, it assure test system can take accurate and reliable data. Among of which, it make Virtual Instrument come into existence and boom. By reason of using graphical programming power, customer can unify layout, service and control with Virtual Instrument standard.This paper gives a on-line axial force detecting system, which applied 2200 aluminum foil mill and put computerized test system into execution by means of computerized simulation, It can substitute the complicated, trivially, traditional artificial making method which needs strain foils sticking and specifying time and again. It also shortens the time of making sensor, heightens economic effect.First, this paper introduce a test system of mill axial force and expound virtual instrument in detail, which is a developmental trend of testing instrument.Then, the paper gives a fundamental concept of strain transducer, talks over design process of pressure sensor of end cover. In order to eliminate theinterference, which is caused by thermal deformation of end cover's and applies to outcoming signal of axial force, a computerized simulation system adapted to the optimal sticking position of strain foil on end cover sensor has been developed, and the system can make thermal deformation interference output zero.Last, this paper explicate systematic dynamic strain gauge some principle about data acquisition and graphics display.