How can we check your rotary vibration work good in 2020



On a piece of equipment, it is critical to the success of the operation and the serviceable life of that unit that all out weights on each end of both vibrators are set in the same location.  Again, refer to the rotary electric manual or call us if there are any questions on the positioning of the outer weights.  It’s critical that all weights be set properly.


Synchronization – Once the outer weights are all set the same and the vibrator with rotation  has been checked to confirm counter-rotation, the unit can be run and the vibrators checked for synchronization.  Synchronization simply means that the vibrators are running at the same speed in opposite directions and thereby producing linear vibration. Typical controls for equipment, when supplied by us, are either a magnetic starter or a variable frequency drive (VFD). It’s important, regardless of the means of starting the two vibrators, that they start together and be controlled by one starter device.


While doing a final check on the equipment prior to shipping to the end-user, we will periodically check for the synchronization of the vibrators.   To check the synchronization of the two vibrators as mounted to the equipment, one weight cover is removed from each vibrator exposing the two eccentric weights on the same end.  Once the covers are removed the unit is restarted and run.  Use caution when operating the vibrators with the weight covers removed.  While the unit is running a strobe tachometer is used to “stop” the motion of the rotating weights and check to see that the vibrators weights are a “mirror” of each other.  To “stop” the motion of the vibrators, adjust the frequency of the strobe to match the operational speed of the vibrators.  At the operational speed, the motion will appear to “stop” and you can easily observe the relationship of one set of weights to the other. You can check out this process on our YouTube Channel.


In the video, the initial frequency of the strobe was slightly off that of the vibrators.  As the speed of the strobe approaches that of the vibrators, the two sets of weights appear to slow to a “stop”.  As seen in the video, the orientation of one set of weights should be mirrored onto the other vibrator.   When the weights appear to “stop” and the orientation is observed, the position of the weights should be a mirror copy of each other. If this is not the case, then the vibrators are not in synchronous operation and will not produce linear motion. This is not the desired condition for successful operation for a piece of vibratory equipment utilizing the Brute force design.


What does it mean if the vibrators are not running together in synchronous operation? This could possibly indicate a problem with one of the vibrators, perhaps an early indication of pending bearing failure or lack of grease on the vibrators with grease fittings. Please refer to the operation manual for the recommended maintenance schedule for grease application, both quantity, and type of lubrication.  Some of the smaller vibrators are permanently lubricated and don’t require maintenance of this type. Another option would be to double-check the tightness of the vibrator mounting bolts. As discussed in the maintenance manual, the vibrator mounting bolts should be checked periodically for tightness. Loose bolts can prevent proper operation and synchronization of the two vibrators.


If you have any questions about properly operating your equipment or vibrator, our friendly and knowledgeable Sales and Services Team is here to help. Contact us today!


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