Agitating – Mortar mixer type – Methods
Patent
1998-11-30
2000-12-26
Walker, W. L.
Agitating
Mortar mixer type
Methods
366 23, 366 25, 366 26, 366 62, 110226, 432103, B28C 526
Patent
active
061648094
ABSTRACT:
A counter-flow asphalt plant with a separately controlled and operated dryer 50 and mixer 52 in which virgin aggregate, recycle material and liquid asphalt are mixed to produce an asphaltic composition. The dryer 50 is rotated by a variable dryer drive 58 about a central longitudinal dryer axis disposed at a dryer angle of declination. Within the dryer 50, aggregates are dried and heated by heat radiation and a hot gas stream generated at a burner head 112 of a combustion assembly 106 positioned inside the downstream end of the dryer 50. The downstream end of the dryer 50 is inserted within the first end of the mixer 52 for delivery of the heated aggregate. The mixer 52 is carried on a tiltable frame 54 and is rotated by a variable mixer drive 88 about a central longitudinal mixer axis disposed at a mixer angle of declination. The dryer 50 and mixer 52 are arranged so that the longitudinal dryer axis and the longitudinal mixer axis lie in a common vertical plane where the mixer angle of declination may be adjustably varied to be less than, greater than or equal to the dryer angle of declination. A recycle feeder assembly 120 feeds recycle material to the mixer 52 between the discharge end of the dryer 50 and the first end of the mixer 52. Liquid asphalt is sprayed from an injector 104 and mineral fines are added from a conveyor 102 extended into the mixer 52. Accordingly, the recycle and liquid asphalt are isolated from the burner head 112 and hot gas stream within the dryer 50, and the mixing cycles and residence times of the materials in the dryer 50 and mixer 52 can be independently controlled to improve economy and efficiency of plant operations by adjustably varying the respective speeds of rotation of the dryer 50 and mixer 52 and by adjustably varying the respective angles of declination of the dryer and mixer.
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Ocampo Marianne S.
Walker W. L.
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