As the name implies, the Shale Shaker basket moves in a uniform circular motion when viewed from the side. This is a “balanced” vibration pattern because all regions of the shaker basket move in phase with the identical pattern. In order to achieve “balanced” circular motion,a vibrator must be located on each side of the shaker basket at its centre of gravity (CG) with the axis of rotation perpendicular to the side of the basket. The Brandt Tandem is a common example of a circular motion shaker.
Linear Motion
Linear motion is achieved by using two counter rotating vibrators which,because of their positioning and vibration dynamics, will naturally operatedin phase. They are located so that a line drawn from the shaker’s centre ofgravity bisects at 90˚ a line drawn between the two axis of rotation.
Because the counterweights rotate in opposite directions, the net force on the shaker basket is zero except along a line passing through theshaker’s centre of gravity. The resultant shaker motion is therefore “linear”.The angle of this line of motion is usually at 45-50˚ relative to the shakerdeck to achieve maximum solids conveyance. Because acceleration isapplied through the shaker CG, the basket is dynamically balanced; thesame pattern of motion will exist at all points along the shaker.
Linear motion shakers have become the shaker of choice for mostapplications because of their superior solids conveyance and fluid handling capacity. Solids can be strongly conveyed uphill by linear motion. The uphill deck configuration allows a pool of liquid to form at the shaker’s feed end to provide additional head and high fluid throughput capability. This allows the use of fine screens to improveeparation performance. The Derrick Flo-Line Cleaner is one example of a linear motion shale shaker.
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