A device for conveying and feeding containers, for machines for processing containers, which device includes a conveyor for movement of containers along an advancement direction, and separation system, which is adapted to mutually space apart the containers along the advancement direction. The separation system includes a screw feeder and at least one abutment wall, which is arranged so as to face to the lateral surface of the screw feeder. The screw feeder has, along its longitudinal extension, proceeding from one of its ends to the other end in the same direction as the advancement direction of the containers, three regions that can be engaged in sequence by the containers, respectively at least one access region for the containers, at least one accommodation region, which is adapted to receive one container at a time from the access region, and an acceleration region for accelerating the containers.

An extraction system for transporting in a longitudinal advancing direction (E) an orderly flow of articles, in particular containers (100), with a support plane (40), a first helical screw (10) and a second helical screw (20), for transporting an orderly flow of articles.

An adjustable screw conveyor includes a plurality of adjustable helical blades disposed in an enclosure having an inlet at a first end of the enclosure and an outlet at a second end of the enclosure, where the plurality of adjustable helical blades includes a first blade and a second blade. The adjustable screw conveyor further includes the plurality of adjustable helical blades being coupled to a first shaft via a plurality of pitch adjustment modules, where a pitch between the first blade and the second blade of the plurality of adjustable helical blades is adjustable.