초록 ▼

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 dri

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).

대표청구항 ▼

1. A rotary drier for plants for the production of bituminous macadams with the use of recycled materials comprising: a hollow rotary cylinder (2) having a first end (3), a second end (4) and an axis of rotation (5) extending from the first end to the second end (4) and, at least in operation, being

1. A rotary drier for plants for the production of bituminous macadams with the use of recycled materials comprising: a hollow rotary cylinder (2) having a first end (3), a second end (4) and an axis of rotation (5) extending from the first end to the second end (4) and, at least in operation, being angled so that the first end and the second end (4) are at different heights above the ground, the cylinder (2) having a predetermined direction of rotation; heating means (9) connected to the second end (4) of the cylinder (2); an aggregates infeed section (7) connected to the cylinder (2) at the end (3), (4) which in operation is highest above the ground, and a dried material outfeed section (8) connected to the cylinder (2) at the other end (3), (4), inside the cylinder (2) a material feed direction being identified from the infeed section (7) to the outfeed section (8); and an insertion section (24) for inserting cut 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) being axially divided, starting at the first end (3), into a first heat exchange zone (12), in which heat exchange occurs mainly by convection, equipped with a plurality of material tipping blades (14), and into a second heat exchange zone (13), in which heat exchange occurs mainly by radiation and conduction; the drier being characterised in that the cut material insertion section (24) is positioned inside the first heat exchange zone (12), and at least 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), and in that the drier is a counter-current drier (1) in which the infeed section (7) is connected to the first end (3) of the cylinder (2) and the outfeed section (8) to the second end (4). 2. The drier according to claim 1, characterised in that at least some of the tipping blades (14) of the first group (25) are provided with a plurality of through-holes (27) designed to allow part of the material being processed to pass through them. 3. The drier according to claim 1, characterised in that it also comprises a second group of tipping blades (14) mounted circumferentially inside the cylinder (2) close to the insertion section (24) and to one side of it opposite the side towards the second heat exchange zone (13), at least some of the tipping blades (14) of the second group being provided with a plurality of through-holes (27) designed to allow part of the material being processed to pass through them. 4. The drier according to claim 1, characterised in that the tipping blades (14) mainly comprise at least one shaped element (16) extending along the cylinder (2) inner surface (18) and having a first longitudinal edge (17) abutted to the cylinder (2) inner surface (18) and a second longitudinal edge (19) which is distanced from the cylinder (2) inner surface (18), forming a blade mouth, the shaped element (16) also having two lateral edges (20) respectively facing towards the first end (3) and towards the second end (4). 5. The drier according to claim 1, characterised in that it also comprises means (30) for slowing material feed from the infeed section (7) towards the outfeed section (8). 6. The drier according to claim 5, characterised in that the slowing means (30) comprise one or more annular partitions mounted on the cylinder (2) inner surface (18). 7. The drier according to claim 4, characterised in that it also comprises means (30) for slowing material feed from the infeed section (7) towards the outfeed section (8) and in that the slowing means (30) comprise a plurality of closing partitions fastened to the lateral edge, facing towards the outfeed section (8), of the shaped element (16) of a plurality of tipping blades (14).