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Rotary Vibrators

In contrast to linear vibrators, other vibrators create a vibratory force through the rotation of an eccentric weight. These rotary vibrators create a powerful vibration much as a household washing machine does when its load is off-center. They supply an energy that is most suited to move fine, dry materials.

A piston vibrator is mounted on the side of a transfer chute.
Rotary vibrators create a powerful vibration through the rotation of an ecentric weight or mass around central axis.

Rotary vibrators can be pneumatically, hydraulically or electrically- powered. The choice for a given application is often determined by the energy supply most readily available at the point of installation.

In rotary pneumatic vibrators, a stream of air drives a mass in a circular orbit to create the vibration; in rotary hydraulic vibrators, it is a stream of hydraulic fluid that moves the mass. In rotary electric vibrators, eccentric weights are typically mounted on the ends of an electric motor rotor or shaft.

Rotary vibrators are available in a wide range of sizes and outputs, to match the specifics of each application. In addition, many rotary electric vibrators can be adjusted by altering the overlap of the eccentric weights—increasing or decreasing the amount of unbalance—to provide the desired amount of vibratory force.

Vibration can induce stress into metal structures, and the walls may need to be reinforced at the point(s) of application. Like linear vibrators, rotary vibrators are typically installed on a mount plate or channel that spreads the vibratory energy (and the weight of the device) over a larger surface area.

Rotary vibrators designed for chutes or hoppers are usually sized based on a 1:10 ratio of output force to the mass of material inside the chute or sloped section of the bin. Generally, the finer the material, the higher the frequency needed to excite the material and make it flow.

On a chute, a rotary vibrator is typically installed in the lower one-fourth to one-third of the structure. If a second vibrator is required, it should be mounted 180 degrees from the first vibrator and halfway up the structure.

Rotary vibrators can be controlled automatically or manually, allowing use only when needed. Once installed, a vibrator must be “tuned” by adjusting its force and/or speed to give the optimum effect for each application.

Topics: Material Flow Problems

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