MIXER FOR PREPARING MOULDING SANDS Russian patent published in 1994 - IPC

FIELD: foundry engineering. SUBSTANCE: mixer has pouring basin with shell carrying internally cross member rotating from drive and carrying ploughs and rolls with vertical axis of rotation, shaft and rest. The lower end surface of each roll is provided with aerating cores positioned concentrically relative to axis of rotation of the roll, spaced uniformly around the circumference and having diameter equal to 0.7- 0.8 diameter of the roll. The diameter of the roll is equal to 0.2-0.3 internal diameter of the pouring basin, and the length of the aerating core of the roll is equal to 0.2-0.4 diameter of the roll. The upper part of the rest of each roll is provided with bushing with radially positioned spikes equally spaced apart. Aerating cores fixed at the ends of the spikes perpendicularly to them are located around the circumference with diameter equal to 0.3-0.5 diameter of the roll. The bushing is mounted for turning around the vertical axis of the roll relative to the rest. The free ends of the aerating cores are coated with wear- resistant buildups. EFFECT: higher efficiency of operation of mixer and higher quality of moulding sands. 3 cl, 4 dwg