Mechanized Green Sand Foundry

Return Sand Temperature, after the vibratory shake out in a mechanized green sand foundry is around ZOOGC. The sand temperature is highest arbacent to the metal surface and lowest away job it. The quantity of heat to be removed depends on the sand to metal ratio and the holding time of metal in the mould. The return sand temperature at the inlet of the cooled after passing through conveyor is around 1 OOOC. Mould of good quality and clean casting surface require well cooled sand.
Sand Cooling requires a continuous and uniform flow to achieve the uniform flow and compensate for irregular Sand supply the sieved hot return sand is stored in a surge hopper from there; a belt transports the hot sand to the cooling conveyor which is designed with a perforated bottom plate. Fresh air is blown through the preparation holes and at the same time water is sprayed on to the sand from nozzles located above the conveyor vibrations of the conveyor and turbulence caused by the air blown through ensure that sand water mix well so that The water evaporates and the sand is cooled. The belt, the cooling conveyor and the sand spraying unit are controlled by level indicators located in the surge hopper the plant operates only if the sand in the surge hopper is between the maximum and minimum level.