Patent ID: 10633238

Abstract:
The present invention relates to a machine 1 for filling containers with liquids, comprising:—a support structure;—a rotating carousel provided with a tank;—a plurality of valve groups mounted on said carousel for filling containers; and a logic control unit suitable to automatically manage the operation of the filling machine. Each valve group comprises an air return tube which is provided with an open lower end, susceptible to be inserted in a container, and an opposite upper end and can be moved axially between at least one lowered position and a raised position. Each valve group comprises: means for guiding the axial movement of the return air tube between a lower end stop and an upper end stop, wherein said at least one lowered position is between said two end stops; elastic mechanical means suitable to exercise constantly an axial thrust action on the return air tube towards the raised position;—means for reversibly blocking the return air tube in any axial position between said lower end stop and said upper end stop; and—a cam follower rigidly connected to the tube. The filling machine comprises a cam which is placed peripherally to the rotating carousel at a first angular position α1 with respect to an entry station to be cyclically engaged by the cam follower. The cam is profiled so as to impose on each tube a predetermined axial displacement H towards the lower end stop and has a circumferentially limited operating angle of working Δ. The filling machine 1 comprises means for moving the cam in height. The logic control unit is operatively connected to the means for moving the cam in height and to the reversible blocking means of each return air tube and is programmed:—to command the blocking of the blocking means when the individual tube is located within the operating angle of working of the cam to keep the return air tube in the lowered position, and—to command the unblocking of the reversible blocking means of each individual air return tube at a second angular position chosen as a function of the filling operating cycle to be performed on the containers.