Side Motion Or Sway
When commissioning new screens in the field....we do stroke checks on the sideplates to determine that the vibrating box is vibrating in a balanced state, even circles or even length and configuration of linear stroke on a linear motion screen.
SIDE SWAY: Theoretically, there should be none ideally. We look directly at the end of the sideplate to determine if we are experiency any side motion which is NOT DESIRABLE.
When we do find this action on a NEWLY BUILT unit...we must double check that the support or cross members are installed PERFECTLY SQUARE. The sideplates MUST BE MATCH DRILLED to ensure squareness and trueness. Many mfrs utilize a WELDING JIG to ensure ABSOLUTE SQUARENESS. If you do not the result can be sidesway.
Basically if not square.....you end up BUILDING a TWIST or RACK in the screen box and the machine will tear itself apart as a result.
Hoping this helps. ■
Re: Side Swaying In Vibrating Screens
P. Rekhawar
If you can take proper test cards I would not worry too much about the cross movement. It csan be also related to your springs - if they are not matched properly.
Another source could be your structure.
You can measure cross movement using frequency analyser and accelererometer - you can get signal in displacement, velocity and acceleration. Get acceleration and recalculate to displacement if necessary. ■
Re: Side Swaying In Vibrating Screens
Originally posted by rekhawar
Dear all,
How do you measure the side swaying in linear motion vibrating screen?
I was told that by placing the paper on the side wall & using pencil, if the strokes have sharp corners, than there is less/no cross vibration. The rounded corners show the presence of cross vibration.
But is there any way we can measure the cross vibrations like the apmlitude( 2s)?
I understand the cross vibration is harmful to life of the machine, specially the cross members.
I am refering to a 150 TPH x 1600 mm x 2500 mm linear Motion Vibrating Screen with Direct Force Excitor for Iron Ore. The required amplitude is 9 mm.
Awaiting your valuable responses.
Regards
P. Rekhawar
George is correct in every aspect of what he has told you, even though your feeder is small in output it will tear itself apart and really make a mess of things.
If that unit has been in service for a while I would definetely look at the welds(including the hidden ones underneath) through out the feeder and use a small steel square to check all the weldments for bending from the exitation.
Use isopropyl alcohol to clean the existing welds and it will expose any cracked ones fairly easily-but wipe the dust off first. ■
Side Swaying in Vibrating Screens
Dear all,
How do you measure the side swaying in linear motion vibrating screen?
I was told that by placing the paper on the side wall & using pencil, if the strokes have sharp corners, than there is less/no cross vibration. The rounded corners show the presence of cross vibration.
But is there any way we can measure the cross vibrations like the apmlitude( 2s)?
I understand the cross vibration is harmful to life of the machine, specially the cross members.
I am refering to a 150 TPH x 1600 mm x 2500 mm linear Motion Vibrating Screen with Direct Force Excitor for Iron Ore. The required amplitude is 9 mm.
Awaiting your valuable responses.
Regards
P. Rekhawar ■