초록 ▼

An asphalt plant apparatus is disclosed having a material lifter cage arranged in coaxial relationship within a mixing drum. The lifter cage includes a plurality of cage lifters having a trough-like configuration for collecting material in the drum and spilling the material in a veil over the cross

An asphalt plant apparatus is disclosed having a material lifter cage arranged in coaxial relationship within a mixing drum. The lifter cage includes a plurality of cage lifters having a trough-like configuration for collecting material in the drum and spilling the material in a veil over the cross section of the drum as the cage lifters pass through a rotational path of travel. The cage lifters are divided into two sets alternately arranged about the lifter cage. The two sets consist of a first set of cage lifters having a material retaining surface fixed at an angle with respect to a radial line extending from the axis of rotation and a second set of cage lifters fixed at an angle approximately 20°different from that of the first set. As the cage lifters pass through the path of travel, the first set of lifters spills material over an arc of the path approximately 20°different from the arc over which the second set spills material thereby increasing uniformity of density of material spilling from the lifters over the path of travel.

대표청구항 ▼

An asphalt plant having a rotatable hollow mixing drum provided with an aggregate inlet and asphalt concrete mix outlet, said mixing drum having an axis of rotation inclined downwards from said inlet to said outlet so the aggregate material entering said inlet of said rotating mixing drum forms a mo

An asphalt plant having a rotatable hollow mixing drum provided with an aggregate inlet and asphalt concrete mix outlet, said mixing drum having an axis of rotation inclined downwards from said inlet to said outlet so the aggregate material entering said inlet of said rotating mixing drum forms a moving bed of material and including at least a drying zone through which the material traverses and hot exhaust gas enters, said mixing drum in the drying zone being provided with flights of spaced-apart, longitudinally extending drum lifters affixed to an inner surface of said drum which rotate with said mixing drum to effect a showering and veiling of the aggregate material across the cross section of the mixing drum after said drum lifters have moved through the material bed carrying aggregate material in a rotational path of travel; the improvements comprising: a lifter cage supported in coaxial relationship within the mixing drum in the drying zone for rotational movement with the mixing drum; said lifter cage including a plurality of cage lifters disposed longitudinally within said mixing drums; means for supporting said cage lifters in a spaced cylindrical array coaxial with said mixing drum for rotation therewith; each of said cage lifters having in cross section a trough-like configuration opening toward said rotational path of travel with said trough-like configuration including a material retaining surface on a side of said cage lifter facing said axis of rotation; said cage lifters including a plurality of sets including a first set wherein said cage lifters within said first set are supported with material retaining surfaces fixed at a common angle with respect to a radial line extending from said axis of rotation; and said plurality of sets including at least a second set wherein said cage lifters within said second set are supported with material retaining surfaces fixed at a common angle with respect to a radial line extending from said axis of rotatation said common angle of said second set being different from said common angle of said first set; said cage lifters within said plurality of sets are alternately arranged about said spaced cylindrical array; whereby said cage lifters collect material during rotation with said first set of cage lifters spilling material therein over an arc of said path of travel different from an arc over which said second set of cage lifters spills material therein providing an increased uniformity of material spilling from said cage lifters through said path of travel.