In fact, they are to be considered as two parts of the same system: arm and mind. The mixing unit is composed of two rotary units rotating on their own axis and whose movement cover the whole surface of the tank ( CERAMIC LINED ). Moreover, mixing is integrated by a high speed rotor that guarantees a quick activation of additives. The planetary driving system supplies a high speed mixing through each rotary unit. Every rotor is composed of three mixing arms provided with blades working on the tank bottom, all units are equipped with wearproof inserts. The mixing tank wall is kept clean by two scrapers provided with wearproof blades. Used sand is put into the mixer through a measuring hopper placed on the top of the cover. Sand is put through a slide opening moved by hydraulic cylinders. The combined action of rotary units – resulting from the sum of the speeds of planetary system, intensive homogenizer and mixing arms – allows to obtain an optimal mixing of ingredients with low specific consumption and high mixing efficiency in the cycle time. Reconditioned sand is discharged through an opening on the tank bottom. Discharge door rotates in a horizontal plane and is moved by a hydraulic cylinder.

The main advantages of hydraulic motor in comparison with the traditional geared motor are:
1. high reliability and sturdiness with equal performances
2. possibility of optimizing mixing speed by varying hydraulic motor rpm
3. absorption of inertia due to accidental stops (blackouts) by means of the exhaust valve
4. restart of mixer at full load with the maximum torque available
5. less components to be serviced
6. possibility of positioning the hydraulic power unit in a safe and clean place.