ES280255U - Rolling mill to balls (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Rotary ball mill, of the type comprising, on the one hand, a fixed tank (1) having a cylindrical wall (2) with vertical axis that is sealed at the top by a lid that opens (7), which allows the introduction of a product to be ground, and on its lower part by a flat bottom (12) provided with evacuation means (13) for the ground product, this vat (1) being divided by a substantially horizontal screen (17) in a upper chamber (18) and in a lower chamber (19) and, on the other hand, a rotor (14) coaxial with the tank (1) and essentially constituted by a rotating shaft (15) that passes through the bottom (11). ) of the tank) and on which a turbine wheel (20) located in the upper chamber (18) and a perforated plate (22) carrying an annular ring (24) which in turn externally carries a disk ground (25), which plate (22), ferrule (24) and grinding disc (25) are located in the lower chamber (19) outside the ferrule (24) is provided with balls (26) of hard material while the ferrule (24) flush by its upper horizontal edge (17) and is arranged so as to leave free, in its lower part, a step cross section provided with a grid (29) for the product in the process of grinding, characterized in that the inner cylindrical surface of the tub (1) is joined to the bottom (12) thereof by a concave annular transition zone (30) whose radius of curvature (r) is constant in the contour of the lower chamber (19). (Machine-translation by Google Translate, not legally binding)