Patent ID: 8490675
Filing Date: 2013-07-23
Classification: B22C

Abstract:
1. A machine for suctioning and exhausting air from a storage tank for sand in a molding machine comprising: a storage tank for sand in the molding machine; a porous body that is provided in the storage tank for sand and that is distant from an inner face of the storage tank for sand; an empty chamber that is formed by an outer face of the porous body and the inner face of the storage tank for sand; a seal that is placed at a rim of a tip of a nozzle for filling sand of the storage tank for sand and that expands when compressed air is supplied inside the seal; a pilot-operated valve for both suctioning and exhausting air that is fluidly connected to the empty chamber; and an on-off valve that is fluidly connected to the pilot-operated valve for both suctioning and exhausting air and connected to an inside of the seal wherein speed control valves are provided between the on-off valve and the pilot-operated valve for both suctioning and exhausting air and between the on-off valve and the inside of the seal.