Mold-pressing machine with liquid-mist injection

Mold-pressing machine for producing casting molds or casting-mold parts by compacting particulate material, comprising:

• a) a mold chamber bounded by at least one mold-chamber wall,
• b) filling means for filling particulate material into the mold chamber,
• c) pressing-force means adapted to move at least one mold-chamber wall towards at least one other mold-chamber wall so as to compact particulate material therebetween,
• d) liquid-applying means adapted to introduce a liquid mist in the mold chamber prior to the latter being filled with particulate material by means of said filling means, said liquid--applying means comprising at least one atomizing nozzle, in which liquid supplied under pressure is atomized by means of an air current, each atomizing nozzle comprising
• d1) a vortex chamber comprising at least one outlet aperture for a liquid-in-air dispersion and into which open
• d2) at least one first nozzle aperture adapted to supply the liquid,
• d3) at least one other nozzle aperture situated in the immediate vicinity of said first nozzle aperture and adapted to supply atomizing air, and
• d4) a stop valve adapted to close the passage to the first nozzle aperture and having a valve member spring-biased towards the closed position and capable of being moved away from the closed position by a piston being acted upon by pressure in the;
• liquid conduit leading to the first nozzle aperture,
• e) air-supply means for supplying atomizing air under pressure to the other nozzle aperture or apertures,
• f) pressure-creating means for applying pressure to the conduit leading to the first nozzle aperture or apertures solely during the period during which the liquid mist is desired to be produced, and
• g) a fast-reacting valve connected in the liquid conduit leading to each first nozzle aperture, said valve, when pressure in the part of the liquid conduit situated between said valve and the first nozzle aperture is higher than pressure on the liquid-supply side of the valve, connecting said part of the liquid conduit to an escape conduit and interrupting its connection to the liquid-supply side of the valve.