Pit & Quarry, July 2012
MAINTENANCE TIPS FROM EQUIPMENT MANUFACTURERS AND OUR READERS The right vibe Observing the stroke of vibratory screens feeders and conveyors is the first step toward efficient operation W hen vibrating screens feeders or conveyors arent performing well the first thing aggregate producers may check is the stroke Is the stroke magnitude correct However in addition to the magnitude other factors should be examined such as the stroke angle direction of rotation and stroke consistency The stroke is the measure of the total vibrating motion of the vibratory machine The stroke can be in the form of a circular pattern an elliptical pattern or it can be linear The stroke pattern will be based on the type of vibratory machine On most machines it will be circular or elliptical If the vibratory machine has two motors or a dual drive or is a two mass type of drive it will be linear or nearly linear For a circular or elliptical pattern the stroke is the measure of the diameter of the circle or the long axis diameter of the ellipse For linear stroke vibratory machines it is the measure of the total movement back and forth of the machine For instance if the stroke is 1 4 in the trough moves 1 8 in forward and 1 8 in back for a total movement of 1 4 in All vibratory machine manufacturers will provide stroke plates and the recommended stroke magnitude for their particular machines Usually these are permanently attached to the sides of the trough Ideally there will be one stroke indicating plate on both sides of the trough inlet and both sides of the trough outlet The manufacturer will also indicate how to read the stroke plate Different manufacturers use different types of stroke plates and the owners manual will illustrate how to read them In addition to providing the magnitude of vibration the stroke plate will indicate the angle of vibration if the stroke pattern is not a circle This is the angle of the ellipse or line as viewed against the horizon It will also indicate the direction of rotation If the stroke is an ellipse or circle it will have a BY MATT SCHORR Simple checks will tell you how efficient your equipment is performing and if any modifications are required 24 PIT QUARRY July 2012 www pitandquarry com
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