fed from the underside of the return sand storage hopper, passes through the
three-stage scrubber to the vibrating screen which is located inside the
cooler/classifier. Consisting of a woven wire steel mesh stretched over a
curved frame, the screen is vibrated by means of a pneumatically operated
piston-type vibrator. This unit is mounted on a framework inside the top of
the cooler/classifier, from which it is isolated by means of leaf springs.
This prevents the possibility of transferring any vibration from the screen
to the body of the cooler/classifier.
The purpose of the screen is to remove all
contaminants from the sand, such as pieces of metal, ceramic sleeves,
pouring cups, and larger than grain-size agglomerates. Any such contaminants
are discharged from the top surface of the screen to the outside of the
cooler/classifier via a waste chute, into a customer-provided waste bin.
All dust produced by the screening process is
removed by dust collector used with the cooler/classifier. This is the main
reason for mounting the screen inside this unit.
Palmer No-Bake Equipment Line