Cone mixer with swivel arm drive and sealing arrangement lubricated by an external lubricant receptacle

A cone mixer, comprising:

• a conic mix receptacle having a receptacle axis and an upper housing cover;
• a swivel arm disposed inside said conic mix receptacle, said swivel arm having a distal end and a proximal end;
• drive means disposed adjacent said upper housing cover and having a drive axis collinear with said receptacle axis, said drive means connected to said proximal end of said swivel arm for rotating said swivel arm about said drive axis;
• a mixing screw rotatably connected to said distal end of said swivel arm;
• an upper sealing package having an upper bearing disposed at the connection between said drive means and said swivel arm, said upper bearing comprising a stationary part in rigid relation with respect to said upper housing cover and a rotating part in rigid relation with respect to said swivel arm;
• a lower sealing package having a lower bearing disposed at the connection between said swivel arm and said mixing screw, said lower bearing comprising a stationary part remaining in rigid relation with respect to said swivel arm and a rotating part in rigid relation with respect to said mixing screw;
• a lubricating fluid receptacle disposed outside said conic mix receptacle for containing a lubricating fluid;
• an upper lubricating fluid supply duct for conducting said lubricating fluid from said lubricating fluid receptacle to said upper bearing;
• a lower lubricating fluid supply duct for conducting said lubricating fluid from said upper bearing to said lower bearing;
• a lower lubricating fluid return duct for conducting said lubricating fluid from said lower bearing to said upper bearing;
• and
• an upper lubricating fluid return duct for conducting said lubricating fluid from said upper bearing to said lubricating fluid receptacle.