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Vibratory Conveyors

From: Bill Schmitt
Remote Name: 65.196.13.9

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I am in need of everyone's assistance again in setting up the collection spec's for some of our vibratory conveyors. These are an all new animal to me as I'm used to looking at high-speed pumps, fans and motors. But I would like to branch out and start looking at our low speed vibratory conveyors. These conveyors are eccentric drives, that run in the range of 300-350 cpm. Most systems consist of a motor (10-30 HP, 1200 RPM) rigidly mounted to the frame, with a belt/sheave reduction to the eccentric drive. The drive is usually two pillow block style bearings on either end of an eccentric shaft, that has a flange (orbital) bearing in the middle that connects through an exciter spring and arm to the shaker deck, which is supported on a bank of reactor springs. We have a fair amount of problems with these orbital flange bearings. They get a bad "knock" in them and the maintenance guys end up changing out the entire drive. In most cases the mechanics are pretty conservative in their assessment of these drives and, in my opinion, they are changed out too early. And in a lot of cases, since they are replacing the entire drive, they are throwing out parts that are probably still good (because they have a hard time determining if the pillow block bearings are bad or if the orbital flange bearings are bad, so they just replace everything). This practice to me is wasteful, so I would like to try and help. And of course there are always a few cases where the problem does not get caught in time and the unit destroys itself and we suffer downtime. Also not a good situation, and again, I would like to try and help. My question is, what kind of readings should I be taking to get useful bearing data from these drives/motors? They are incredibly violent at 1x running speed (300-350 cpm), with velocity's as much as 10+ ips at the flange bearings. Even on the fixed pillow block bearings velocity's above .5 ips are not uncommon. What kind of collection spec should I be using? (# of avg's, overlap, windowing, filtering, lines of resolution, etc...) Should I filter out the 1x running speed altogether with a Hi Pass filter? Thanks in advance for the help. Responses through this board or e-mail are fine. schmittw@tka-waupaca.thyssenkrupp.com Bill Schmitt - PdM Technician - ThyssenKrupp Waupaca Foundry Plant 4 - Marinette, WI, 54143

Last changed: October 16, 2007