Structural Support
Hello: Reading your notes, it appears like the structural support was apparently lacking or unequal on right side below vibrating conveyor.
It in fact, is not unusual to find this condition at times in either new and/or older installations.
If the support is not equal, the vibration of the machine in fact, can be unequal and cause a WEIRD or unequal flow across the length or width of the vibrating device.
DID you do a STROKE check all the way around the vibrating body? This would confirm a WEIRD pattern probably.
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FIELD EXAMPLE: I once had a four bearing vibrating screen (TYROCK in this case) that was ripping corner rubber in one place only, repetitively and consistently. We made about 4 expensive air flights to site to check with not much success.
the last trip, we very CLOSELY walked around above and BELOW the underside of the vibrating screen to check out the SUPPORT STRUCTURE in painstaking detail. What we in fact discovered was this was an old operation and we notice a nice BRAND NEW vertical support beam but, only one. This was under the corner where the rubber was ripping........turned out to be nice and new BUT, the height was slightly incorrect NOT QUITE TALL ENOUGH .......so the machine detected this unequal setup and notified us by way of RIPPING just the one corner rubber as way of showing us. We shim plated the beam to correct height.....the problem in this particular instance was FIXED.
This MAY be possible theoretical solution for you.
DID YOU CHECK ACROSS THE WIDTH of the conveyor to determine exact LEVELNESS?
Regards, Hoping to help............George Baker MODERATOR ■
Another Point.....
a loose component or broken cross member can cause a WONKY travel pattern on the material flowing across a vibrating conveyor.
THIS would indicate something that is part of the total vibrating wieght that is kinda........and in fact, running at its own RPM or FREQUENCY...
George ■
Re: Theoretic Doubt
George,
All in that equipment is symmetrical viewing in the flow direction. During my tests and investigation of the problem, I have checked the levelness, motors force and weights, all was OK. The vibration was more intense in the front right side ever.
At the beginning I thought that the problem was in the machine (lack of rigidity or loose component as you mentioned) I interchanged this machine for other equal that was working OK in other structure. The problem continued in the same structure and the machine was problems run OK in the other structure. Then obviously the problem was in the structure.
The support structure of this vibrator is a simple rectangular structure with 4 vertical legs of length 40 inches, joined with a horizontal beam in the top and other equal in the bottom, in both sides, the same configuration in front and rear. With this support the machine is running very well.
The only difference between this support and the support that originated the problems is the front top horizontal beam; it was 12 inches lower of the top of the legs. I only have removed this beam and weld at the top level of the legs and the problem disappeared.
Even I have trials with the machine inverted with the 12” lower beam in the rear, the result was the same (more speed in the right side).
Nice problem.
Thanks,
German ■
Nice Fix !!!
German: Thankyou for your response - much appreciated.
Nice to hear real life stories from the field.
George Baker
CANADA ■
Theoretic doubt
Hi group.
I was a problem with a horizontal vibratory conveyor formed for opposite rotating unbalanced motors.
The flow was not homogeneous in all trays, in the rear the flow was smoothly at adequate speed, but in the front the flow was faster in the right side and slows the left side.
Investigating the problem I make many trials, I inverted the motors rotation, changed the motors angle, even I tried with different force of the motors, increasing the force in the right motor against the left, even opposite, but problem was every more speed in the right side considering moreover that conveyor is symmetrical.
Finally I found that the problem was lack of rigidity in the support structure, this generating abnormal vibration over the tray. The structure also is symmetrical.
Now I am a theoretic doubt, Why the problem was every in the right side?
Thanks,
German ■