Abstract: A machine for making mould cores from flowable sand mixtures in hot multi core boxes including a supporting frame carrying a conveyor whereon core boxes are placed, each of the boxes having a top and a bottom piece and mechanically interlinked main and additional gates. The gates are adapted to close or open respectively the central and peripheral core print openings of the core boxes while interacting with their respective individual drives. When the main gate and one of the additional gates interact with their respective individual drives made fast on the supporting frame at the pressing mechanism, they close respectively the central and peripheral core print openings. When the main gate and the other additional gate interact with their other individual drives made fast on the supporting frame before the splitting-up mechanism, they open the central and peripheral core print openings.

Abstract: A feature of the present invention is that an apparatus comprises an actuator of mechanisms for pressing and moving a batching chamber with a double-action cylinder whose internal ram is connected rigidly to a pressing plunger, and an external ram, to the batching chamber formed with interconnected parts having a horizontal groove at the point of their connection, the horizontal groove accommodating an additional gate with a port operated by an independent actuator. The internal ram mounts a device for adjusting the position of the pressing plunger, whereas the top head of the actuator of the mechanisms for pressing and moving the batching chamber accommodates a device for adjusting the position of the batching chamber, the top part of the batching chamber having a port providing access to the device adjusting the position of the pressing plunger.