Device for the controlled admission of a noxious powder into a box

Device for the controlled admission of a noxious powder into a box having an aperture which is to be closed by a lid, wherein it comprises:

• a body of generally cylindrical shape, said body having a lower part terminating in a sealing skirt defining an opening;
• said body being connected to a powder inlet pipe, to a gas extraction pipe, and to an upper tube comprising a magnetic device controlling a valve mobile in said body and adapted to cooperate in a sealed manner with said sealing skirt which forms a seat for said valve,
• a housing fixed on said lower part of said body, said housing having an opening in its central part to allow the passage of the box so that said aperture of the box communicates with said opening of the body, said housing comprising a retractable mobile device ensuring grip and transfer of said lid of the box,
• means for detecting the quantity of powder in the box, and
• at least one ventilation circuit ensuring, at the level of the circumference of the opening of said housing and/or at the level of said sealing skirt, an evacuation of that part of said powder which might be located at those levels.