Molding unit for blow molding containers, equipped with a guiding wear ring

A molding unit (1) for blow molding a container from a parison, said container comprising a wall portion and a bottom, said molding unit (1) comprising:

• a mold sidewall (2) extending along a main axis (X) and having an inner molding surface (3) defining a counter print of the wall portion of the container, and an opening (8) at a lower end of the inner molding surface (3),
• a cylinder jacket (10) fixed to the mold sidewall (2) and extending axially below the opening (8);
• a mold base (14) having a cylindrical bracket (17) slidingly received within the cylinder jacket (10) and a body (15) axially protruding from the bracket (17) and having an upper surface (16) defining a counter print of the container bottom, said mold base (14) being axially movable with respect of the mold sidewall (2) between a retracted position in which the upper surface (16) is offset with respect of the opening (8), and a raised position in which the upper surface (16) closes the opening (8),
• the molding unit (1) further comprising a wear ring (33) fixed to the mold base (14), said wear ring (33) including a cylindrical guiding bushing (34) interposed between the bracket (17) and the cylinder jacket (10).