Foundry molding machine for box molds

摘要

The molding machine has injection apparatus which operates with compressed air for filling a molding box with molding sand and pre-compacting the sand. Vents for escape of spent air from the molding box are provided in a filling frame, which rests on the molding box during filling and compaction, and may also be provided on the surface of a pattern plate carrier and in a pressure plate against which the sand is finally consolidated by pressure exerted through said carrier. Exhaust means for the spent air comprise an annular passage on the outside of the filling frame. The pressure plate is formed to define nozzles through which the sand is injected into the molding box. Means are described for supplying sand and compressed air, for conveying a succession of molding boxes and for mounting, lifting and lowering the pattern plate carrier and withdrawing the latter for replacement of the pattern.