Drying/coating drum for the preparation of bituminous coated products, comprising an improved burner

Claim 1

A drying and coating drum for the preparation of bituminous coated products from aggregates and bitumen, the drum having a casing (1) of cylindrical form comprising a first end (2), or intake end, via which at least part of the aggregates are introduced, and a second end (3), or discharge end, via which the body (19) of a burner (20) penetrates into the drum in its axial direction up to a zone which is distant from the discharge end (3) so as to develop a flame; (14) and to circulate hot gases along the drum, in the direction opposite to the direction of circulation of the aggregates, from the end (19a) of the body (19) of the burner, a means (31) for injecting bitumen disposed so as to emerge in a coating zone (30) of the drum located around the body (19) of the burner (20) and means for rotating the drum about its axis (5), wherein the part of the body (19) of the burner (20) located inside the drum is disposed coaxially inside an outer peripheral sleeve (22), free in rotation about the body (19) of the burner and connected to the casing (1) of the drum, one end of which, corresponding to the end of the burner (20) from which the flame (14) develops, carries a plurality of blades (25, 26) which are radially directed relative to the casing (1) of the drum and have faces which are tilted relative to the longitudinal direction (5) of the drum and form a turbine for sucking gas in the direction from the second to the first end of the drum during rotation of the drum and a screen against radiation from the flame (14) of the burner (20).