Vibrating Screen fault diagnosis | bulk-online

Among the conditions to be checked periodically in screens, the shape of motion is one of the most important. In the chart below, one can see and verify the shape of the vibratory motion: circular (A), elliptical (B) or even linear (C).

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Let’s examine a few concepts related to amplitude:

• The amplitude of vibration does not depend on the rotation of the vibrating mechanisms.
• Amplitude combined with rotation imparts a certain amount of acceleration to the equipment and that acceleration is responsible for the conveyance of the material.
• The larger the material to be conveyed, the greater the vibration amplitude of the equipment should be.

There is an ideal relation between operating rotation, amplitude and the degree of inclination of the equipment depending on the aperture of the mesh installed on the screens. The nominal rotation is established observing the ideal operating conditions and, further, to ensure that the equipment is operated safely below the vibrating structure’s critical frequency.

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Warning: Never alter the rotation of vibrating equipment before checking with the Metso Outotec equipment application area.

The amplitude of vibration can be altered by changing the position of the movable counterweight. Such adjustment is performed based on the application. The screening of coarse material demands a higher amplitude than the amplitude required for the classification of fines.

The following table provides the recommended values for total displacement (twice the amplitude):

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