초록 ▼

A drum mixer asphalt plant is provided with a rotatable cylinder having an internal passageway where the aggregates and asphalt are mixed to produce an asphaltic composition. In a first zone within the mixer, aggregates are heated and dried by heat radiation and the stream of hot gases produced by a

A drum mixer asphalt plant is provided with a rotatable cylinder having an internal passageway where the aggregates and asphalt are mixed to produce an asphaltic composition. In a first zone within the mixer, aggregates are heated and dried by heat radiation and the stream of hot gases produced by a burner flame. In a second zone within the mixer, liquid asphalt is mixed with the aggregates. An exhaust tube is disposed within the passageway and extends from the output end of the drum mixer into the first zone to remove the hot gases to prevent degradation of the asphalt. Thus, the second zone wherein the liquid asphalt is mixed with the aggregate is isolated from the hot gases used for heating and drying. Recycle asphalt material may be added in both the first and second zones of the mixer drum.

대표청구항 ▼

A drum mixer for producing an asphaltic composition from asphalt and aggregates, said mixer comprising: a rotatable cylinder having first and second open ends with an internal passageway communicating therebetween and having first and second zones, said cylinder disposed substantially horizontal wit

A drum mixer for producing an asphaltic composition from asphalt and aggregates, said mixer comprising: a rotatable cylinder having first and second open ends with an internal passageway communicating therebetween and having first and second zones, said cylinder disposed substantially horizontal with said first end inclined slightly above said second end; drive means to rotate said cylinder about the central longitudinal axis thereof; aggregate feed means having a discharge portion extending within said first open end of said cylinder to deliver aggregate material to said first zone of said cylinder; burner means adjacent said first end of said cylinder to generate a hot gas stream within said first zone of said cylinder in order to heat and dry the aggregate material delivered thereto; an exhaust tube penetrating the second end of said cylinder and disposed within said internal passageway of said cylinder, said exhaust tube communicating with said first zone to remove said hot gas stream generated by said burner means and thereby prevent said hot gas stream from reaching said second zone; liquid asphalt feed means disposed within said second zone of said cylinder for delivering liquid asphalt thereto to form an asphaltic composition; and discharge means for directing said asphaltic composition from said second zone of said cylinder.