Patent ID: 6340240
Filing Date: 2002-01-22
Classification: E01C

Abstract:
A drum mixer for heating, drying and mixing of aggregate material, comprising:an inclined drum forming a pre-heating/blending section adjacent said first end, and a heating/drying/mixing section adjacent to said pre-heating/blending section; means for feeding aggregate material into the pre-heating/blending section of said drum for movement of the aggregate material sequentially through said pre-heating/blending section, and said heating/drying/mixing section; a burner assembly creating a high temperature gas stream flowing through said heating/drying/mixing section and said pre-heating/blending section; and tubular compartments in said heating/drying/mixing section, each of the tubular compartments defining an aggregate transporting channel within the tubular compartment such that at least a portion of each of the aggregate transporting channels is isolated from the other aggregate transporting channels, the aggregate transporting channels extending through at least a portion of said heating/drying/mixing section such that the aggregate transporting channels within the tubular compartments are out off direct contact with the high temperature gas stream and said tubular compartments are exposed to said high temperature gas stream whereby said aggregate material can be heated indirectly by said high temperature gas stream as the aggregate material passes through the aggregate transporting channels.