| 摘要 |
The present invention is related to the casting industry, and more particularly to a machine for blowing sand cores, which dispenses silica sand to a mechanical device that simultaneously impels said sand previously mixed with a binder, to a core-shaped model to be formed by means of pressure-generated air in order to form hollows in cast pieces. The inventive machine is characterised in that it comprises a device for gradually controlling the supply of air and pressure useful for impelling and impacting the silica sand and binder mixture at a controlled speed into a core-shaped model to be formed. Said device further includes electro-pneumatic and /or hydraulic means, safety and exhaust valves, and a means for controlling the aforementioned elements, which is preferably a programmable logic control (PLC).
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