Output mechanism of a mixer with converging conical twin screws

A mixing and extrusion machine (10) for the production of rubber mixtures, the machine (10) comprising:

• a converging conical twin-screw mixer (12) with a fixed frame (14) that supports sleeves (16) in which two screws (18) are mounted at an angle between an opening (22) disposed upstream of the sleeves, where an introduction hopper (24) of the machine (10) feeds the screws, and an outlet (25) disposed downstream of the sleeves, where the mixer (12) discharges the mixture at the end of a mixing cycle, one or more motors (20) that rotate the two screws in the sleeves during the mixing cycle, and one or more removable doors provided at the outlet (25) to allow, during the mixing cycle, the discharge and shaping of a rubber mixture,
• wherein the screws are mounted in the sleeves (16) with the removable doors that conform to the shape of the screws, the removable doors comprising sliding shutters (40) installed relative to the outlet (25) so that the sliding shutters move linearly between a closed position, in which the sliding shutters prevent the mixture from exiting the mixer (12), and an open position, in which the sliding shutters prevent the discharge of the mixture through the sides of two counter-rotating rollers (32) of a roller nose system arranged just downstream of the outlet (25) in order to force the mixture to pass between the two rollers and to form a sheet of the mixture at a predefined thickness and width discharged from the mixer (12).