Rotor with anti-wear device and fixation system

A rotor for use in an internal mixer having a mixing vessel in which the rotor rotates, the rotor comprising:

• one or more blades, each blade having a tip with a profile having a predefined curvature;
• an anti-wear device detachably fixed to the tip of at least one blade, the anti-wear device comprising a plate with a profile defined by a lower surface with a curvature complementary to that of the tip and an upper surface with a curvature complementary to that of a wall of the vessel to define, between them, a zone of minimum gap that allows a passage of a mixture between the plate and the wall of the vessel;
• and
• one or more fastening systems positioned and tightened relative to the plate in order to engage the rotor,
• wherein each fastening system comprises:
• a retaining screw comprising:
• an elongated substantially cylindrical screw head with a circumferential surface corresponding to a diameter of a counterbore of the plate into which the retaining screw is inserted, the screw head extending along a predetermined length between an engaging end, where an engagement surface is defined for engaging a shoulder of the counterbore of the plate, and an access end, the screw head with an insertion channel extending along the length of the screw head with a predetermined cross-sectional geometry;
• and
• a substantially cylindrical elongated screw shank extending from the engagement surface of the screw head, the screw shank with a predetermined diameter being held in a corresponding rotor thread in which the retaining screw is mounted, the screw shank extending along a predetermined length between an insertion end, where the screw shank receives a clamping means passing to the insertion channel of the screw head, and an opposite end fixed in the rotor, the screw shank with a mounting conduit extending along the length of the screw shank;
• and
• a clamping means comprising a central pin, the central pin comprising:
• a plug with a cross-sectional geometry corresponding to the predetermined cross-sectional geometry of the insertion channel of the screw head, the plug extending along a predetermined length between an engaging end, where an engaging surface of the plug is defined to engage against a shoulder of the insertion channel of the screw head, and an opposite outer end;
• and
• a substantially cylindrical elongated rod extending from the engagement end of the plug, the rod having a predetermined diameter corresponding to the mounting conduit of the screw shank for mounting the central pin therein.