System or machine for sorting objects with an aeraulic control device

An installation for sorting objects comprising:

• mounted in a casing, a sorter with planar geometry, and
• an aeraulic management system controlling the circulation of air in the installation,
• the sorter has at least:
• a conveyor with a moving belt on which the objects to be sorted are arranged in a single layer,
• a detection device configured to inspect the objects circulating on the conveyor and classify them after analysis into at least two categories,
• an air jet ejection device located at the outlet end of the conveyor and configured to selectively eject upward the objects detected as belonging to at least one of the classification categories and falling from said outlet end,
• at least one separation wall arranged at a distance from the outlet end of the conveyor and configured to separate at least one flow of freely falling objects and one flow of ejected objects, and
• the aeraulic management system comprising at least:
• a containment structure extending above the conveyor over a longitudinal part of the latter and forming therewith a guide tunnel into which there is injected a laminar air flow (FAL) circulating substantially at the same speed as the objects to be sorted,
• an outlet box, forming part of, or mounted in, the casing as appropriate, cooperating with the separation wall(s) to constitute a compartment for receiving the non-ejected objects and at least one compartment for receiving the ejected objects, these compartments having respective outlets for discharging the categorized objects which have fallen therein, wherein the outlet box is subjected to air suction in order to discharge to the outside the excess air in the installation, substantially without disturbing the flows of the objects that are to be sorted or have been sorted, in that it comprises two mutually independent air circulation devices for example with turbines, one of which ensures the injection of external air for the generation of the laminar air flow and the other of which ensures the suction and discharge to the outside of the installation of the excess air at the outlet box, and in that the air suction and discharge device is adjusted or controlled depending at least on the surface and quantity of the sorted objects, and on the possibilities of air passage at the discharge outlets.