Patent ID: 7931222

Claim:
Agitator mill for treating free-flowing grinding stock, comprising a grinding receptacle ( 2 ) which defines a substantially closed grinding chamber ( 8 ) by means of a receptacle wall ( 9 ) and an agitator ( 20 ) which is rotatably drivably disposed in the grinding receptacle ( 2 ) in a direction of rotation ( 42 ) and which is cup-shaped with respect to a common central longitudinal axis ( 19 ), and which has an annular cylindrical rotor ( 35 , 35 ′) which is provided with implements ( 38 ) extending as far as into the vicinity of the receptacle wall ( 9 ), and an interior stator ( 22 , 22 ′) which is disposed within the rotor ( 35 , 35 ′), which is joined to the grinding receptacle ( 2 ), and which has a closed outer wall ( 23 ), wherein the annular cylindrical grinding chamber ( 8 ) is formed between the receptacle wall ( 9 ) and the rotor ( 35 , 35 ′) and receives auxiliary grinding bodies ( 43 ) with a diameter c, and wherein an annular cylindrical interior chamber in the shape of an annular gap is formed between the rotor ( 35 , 35 ′) and the outer wall ( 23 ) of the interior stator ( 22 , 22 ′), said interior chamber being disposed coaxially within the grinding chamber ( 8 ) and connected thereto via a deflection conduit ( 50 ), and wherein a grinding-stock supply chamber ( 58 ), which is disposed upstream of the grinding chamber ( 8 ) and opens into the latter in a direction of flow ( 44 ), and a protective screen ( 30 , 30 ″), which is disposed downstream of the interior chamber ( 8 ) in the direction of flow ( 44 ), are disposed approximately on the same side of the grinding receptacle ( 2 ) for the grinding stock to pass through, and wherein auxiliary-grinding-body return conduits ( 55 ) are provided in the agitator ( 20 ) for returning the auxiliary grinding bodies ( 43 ) from the vicinity of the protective screen ( 30 , 30 ″) into the grinding chamber ( 8 ), said return conduits ( 55 ) connecting the end of the interior chamber to the beginning of the grinding chamber ( 8 ), wherein the interior chamber is a grinding-stock discharge conduit ( 47 ), and wherein devices are provided to prevent a carry-over of auxiliary grinding bodies ( 43 ) from the grinding chamber ( 8 ) into the grinding-stock discharge conduit ( 47 ).