Welds Cracking.....
Farouq: How are you today? Hope all is semi - well in Pakistan.
This one sounds fascinating, lots of hoops here:
1. A DIGITAL PIC of problem area would be SUPER to troubleshoot properly. It would show me lots!
2. Meantime, Is there a manufacturer's MODEL or home made?
3. Is it a screener.......sounds like it is..........or a feeder.....kinda sounds like a feeder also.........but, it is making a 20 mesh cut.
4. Welding cracks could be in the welding or rewelding techniques being used...........if you jut FILET WELD.......say full 1/4" weld......like most people do.......to fix.....it will typically recrack at the weld.
BECAUSE this is a vibrating unit...........ie: not stationary chute....the vibration in the machine....spots the weak spot created by HEAT on a filet weld........and cracks it back out.
HEAT MUST BE CONTROLLED on vibrating screens and preferably no welding is even better......mechanical connection much better
STITCH WELD or skip weld......better.......as it is self relieved and does not concentrate the heat hence, you eliminate the recracking out.
5. The vibrator type almost seems WRONG for this separation.
6. The angle of 10 degrees seems wrong for this 20 mesh separation....FLOW would be a problem for sure a 10 degrees.
7. CHECK VSMA speed, stroke, slope charts.......you will see we are not in compliance at all.
Hoping to find the solution........let me know how you come along here.........please and thankyou.
Respectfully, George Baker......Moderator ■
Interference With Stationary Structure?
Another point: If you are striking the structure on shutdown....at all........this will also........quickly CRACK a weld.......on this unit.
You are clear all the way around the unit? and not hitting on shutdown?
George ■
Cracks on screen body
we have vibrating screen 8 feet by three feet. inclined at 10 degree .an electromechanical vibrator 1.5 kw and 2800 rpm is installed underneath the centre of the screen.the screen is suported on four springs. the base on which the vibrator is bolted,is welded with the screen deck base.
the problem is that the welded portion along with the adjacent screen body cracks.also the material bubbles on the wire mesh.
the flow of the finisheed material (minus 20 dolomite powder)is also poor.
kindly help me solve the problem ■