Abstract: An elementary length of the ducting comprises a pair of top and bottom plane panels (2, 3) and a pair of side panels (4, 5) having outwardly projecting longitudinal rims (8, 9, 12, 13) on their outside faces, the margins (10, 11, 14, 15) of the top and bottom panels (2, 3) and the rims (8, 9, 12, 13) of the side panels (4, 5) are predrilled to receive fixing bolts (6). A detection panel (47) is disposed as an inside lining of the bottom panel (3) and is connected via its own rims (48, 49) to the side panels (4, 5), and a tunnel (52) is left between the bottom panel (3) and the detection panel (47), with said tunnel opening out into the ducting, close to a bend.

Abstract: A device for discharging pulverulent products contained in a cylindrical silo from an appropriate part of the lower periphery of the silo, in which a radial horizontal arm equipped with an Archimedia's screw is placed in the immediate vicinity of the lowest part of the silo and is mounted on a turret, in which there is placed a fixed vertical shaft co-axial with the silo, having a first pinion which cooperates with a second pinion secured to the shaft of the Archimedean screw, and wherein a chain given by a motor is provided to rotate the arm and the turret around the axis of the silo.