A Banerjee,

What kind of screen is?

Have been changed in weights or motors?

Since 20 mts is high structure, is the sufficiently rigid?

Mainly different vibration in one extreme is due to unbalance of the forces and GC.

Regards,

German ■

Hola Banerjee: some bullet points to consider:

1. The higher the vibrating screen is in a building.......the more possibility of vibration being transmitted down into support structure.

2. Must have minimum 2" clearance around vibrating body to avoid hitting on primarily shutdown, not as critical on startup

3. Vibration only near discharge end. You may be in "contact" or a slight interferance fit with the discharge lip to the takeaway chute. Possible rubbing of chute to underside of discharge lip on the screener?

4. If coil springs are packed with dirt, no isolation of vibration being transmitted to the structure. Ensure cleaned out all time.

5. Did you by chance, add an extension to the discharge lip of the vibrating screen? If so, and many people do this......you create an UNEQUAL or unbalanced condition at that spot and this will be indicated by structural vibration in that area.

6. Unbalance extra static weight built up on the vibrating body?

7. Extra packed material sitting on discharge lip?

8. Make sure vertical support beams are located directly under the coil springs or this can cause vibration to structure.

Let me know, how you make out on this..........tks George ■

Dear Mr. Banerjee,

There can be many reasons for screen excessive vibration.

But Looking at your Description two things spring up to the mind at once:

i) Since you say the cardon shaft is damaged; it is possible, that the cardon shaft was streached beyond the specified limit and instead of being a floating link between the screen and the stationery motor it was transmitting vibrations.

ii) secondly the front springs may have lost the tension ( Note please change all springs to gather even if you feel some are alright.

Finally there is one small thing; amplitude limitation in screens, is acheived by a rubber cushion and a strip of rubber fixed on to the top and bottom of the spring support plate which may have not been fixed and hence the vibrating frame is flying off.

Trust , the post help you think on some lines.

Keep us posted how you solve the problem , I am eager to hear from you

BMPLogis ■

How have we progressed with the excessive vibration problem?

If you removed a full deck of wirecloth.........to let material just pass through the box .......the removal of the extra weight would cause excessive vibration....due to a UNBALANCED condition being created.

SAME THING is extra weight added to only one area of screen box

.................

Reading the other reply..........Yes......if the carden shaft was damaged......my question is HOW and WHY and how was it repaired......this sounds like a good candidate area for problem vibrations to originate from

...................

Let me know where you are at presently please, so we can update our participants.

TKS...........GEORGE ■