Replies sorted oldest to newest
Sounds like normal behaviour. I suspect the "up & down" will be at wire tracking frequency, ie one cycle of edge as it tracks from tender side to drive side and back again. I believe this loads the bearing races in that direction as well as effecting the 1x.
One thing to check - and this depends on the bearings fitted - if there is an outrigger bearing then it could have a problem. But you might have Timken tapered rollers. High 1x on Guide and stretch rolls is normal in my experience. Often relates to poorly adjusted spherical brackets which do need slight clearance to allow bearing housing to move but not too much. rgds.
i experienced same problem at 1x roll, 7 Hz ( 20 in/s), i think it is resonance.
i performed bump test on the air billow construction , relieved 7 Hz natural frequency, we tried to change the pressure and the tension of the felt but did not help.
how to fix such problem, the roll is only one year in operation.
waiting your help
We have several paper machines here that have air bellows guide rolls, vibration amplitudes change with speed, but if I see a 1XTS at 1 in/sec I don't get too excited
thx for your reply, just the production get some panic, ...at the moment it is 2 in/s