Abstract: A rotary drying cylinder (1) for plants for the production of bituminous macadams, extending along a main axis (2). The drying cylinder (1) comprises a burner (7), connected to the cylinder, which generates a flame (9) that extends inside the cylinder (1). The drying cylinder (1) internally comprises a tube-shaped shielding structure (10) having an axis of extension which is substantially parallel with the main axis (2) and extending from the burner (7) so that, in practice, the flame (9) is at least mainly confined within the shielding structure (10), there thus being a separating ring (12) between the shielding structure (10) and the inner surface (13) of the drying cylinder (1). The shielding structure (10) comprises a plurality of hollows (17) facing towards the inner surface (13) of the drying cylinder (1) for containing, in practice, the material being dried. The shielding structure (10) is at least mainly made of heat conducting materials.

Abstract: A rotary drier for plants for the production of bituminous macadams with the use of recycled materials comprises a hollow rotary cylinder (2), heating means (9) connected to one end (4) of the cylinder (2), an aggregates infeed section (7) connected to one end of the cylinder (2), a dried material outfeed section (8) connected to the other end and an insertion section (24) for inserting recycled cut material into the cylinder (2), the insertion section being connected to an intermediate portion of the cylinder (2).

Abstract: A rotary drier for plants for the production of bituminous macadams with the use of recycled materials comprises a hollow rotary cylinder (2), heating means (9) connected to one end (4) of the cylinder (2), an aggregates infeed section (7) connected to one end (3), (4) of the cylinder (2), and a dried material outfeed section (8) connected to the other end (3), (4), an insertion section (24) for inserting recycled material into the cylinder (2), the insertion section being connected to an intermediate portion of the cylinder (2). The inside of the cylinder (2) is axially divided into a first, convection heat exchange zone (12), equipped with material tipping blades (14), and into a second, radiation and conduction heat exchange zone, and the cut material insertion section (24) is positioned inside the first heat exchange zone (12). A first group (25) of tipping blades (14) is mounted circumferentially inside the cylinder (2) between the insertion section (24) and the second heat exchange zone (13).

Abstract: A rotary drier for plants for the production of bituminous macadams with the use of recycled materials comprises a hollow rotary cylinder (2), heating means (9) connected to one end (4) of the cylinder (2), an aggregates infeed section (7) connected to one end of the cylinder (2), a dried material outfeed section (8) connected to the other end and an insertion section (24) for inserting recycled cut material into the cylinder (2), the insertion section being connected to an intermediate portion of the cylinder (2).

Abstract: A rotary drier for plants for the production of bituminous macadams with the use of recycled materials comprises a hollow rotary cylinder (2), heating means (9) connected to one end (4) of the cylinder (2), an aggregates infeed section (7) connected to one end (3), (4) of the cylinder (2), and a dried material outfeed section (8) connected to the other end (3), (4), an insertion section (24) for inserting recycled material into the cylinder (2), the insertion section being connected to an intermediate portion of the cylinder (2). The inside of the cylinder (2) is axially divided into a first, convection heat exchange zone (12), equipped with material tipping blades (14), and into a second, radiation and conduction heat exchange zone, and the cut material insertion section (24) is positioned inside the first heat exchange zone (12). A first group (25) of tipping blades (14) is mounted circumferentially inside the cylinder (2) between the insertion section (24) and the second heat exchange zone (13).

Abstract: A rotary drying cylinder (1) for plants for the production of bituminous macadams, extending along a main axis (2). The drying cylinder (1) comprises a burner (7), connected to the cylinder, which generates a flame (9) that extends inside the cylinder (1). The drying cylinder (1) internally comprises a tube-shaped shielding structure (10) having an axis of extension which is substantially parallel with the main axis (2) and extending from the burner (7) so that, in practice, the flame (9) is at least mainly confined within the shielding structure (10), there thus being a separating ring (12) between the shielding structure (10) and the inner surface (13) of the drying cylinder (1). The shielding structure (10) comprises a plurality of hollows (17) facing towards the inner surface (13) of the drying cylinder (1) for containing, in practice, the material being dried. The shielding structure (10) is at least mainly made of heat conducting materials.