Extraction system for transporting in an advancing direction an orderly flow of articles

An extraction system for transporting in a longitudinal advancing direction (E) an orderly flow of articles (100), comprising:

• a support plane (40), which extends parallel to the longitudinal advancing direction and to a transverse widthwise direction (Y-Y) and on which the articles (100) are supported so as to advance in said longitudinal advancing direction (E), arranged in-line in an orderly flow with a predefined orientation and/or position;
• a first helical screw (10) with a longitudinal axis (10a) parallel to the advancing direction (E), arranged in a position above the support plane (40) in a vertical heightwise direction (Z-Z) and with its longitudinal axis (10a) axially offset in the transverse direction (Y-Y) with respect to the advancing direction, the first helical screw being set to rotate about its longitudinal axis (10a);
• a second helical screw (20), with a longitudinal axis (20a) parallel to the axis (10a) of the first helical screw (10) and to the advancing direction (E);
• wherein the second helical screw is arranged in a position above the support plane in the vertical heightwise direction (Z-Z) with its longitudinal axis (20a) axially offset in the transverse direction (Y-Y) on the opposite side to the first helical screw with respect to the advancing direction (E) and is set to rotate about its longitudinal axis with a speed which is synchronized with the rotation of the first helical screw and a same sense of rotation as the sense of rotation of the first helical screw, so that a plurality of containment spaces (e1,e2,e3, en) for containing and advancing an article on the support plane (40) are defined between the first helical screw and the second helical screw, the containment spaces (e1,e2,e3,en) being arranged in sequence in the longitudinal advancing direction (E) so that rotation of the two helical screws (10,20) allows the advancing of an article from one space to the next space in the advancing direction, resulting in the orderly flow of articles, and
• a first driving means (12) for rotationally driving the first helical screw (10);
• a second driving means (22) for rotationally driving the second helical screw (20):
• wherein the first driving means and the second driving means can be controlled and configured to adjust an initial phase of a helical threading (11,21) of the first helical screw and/or the second helical screw so as to adjust a phase difference (Δφ) between the helices of the two helical screws (10,20) in order to vary a longitudinal length of each containment and advancement space (e1).