Blast-spout for pneumatic seed drill machines and other machines or installations

The invention refers to a blast-spout for pneumatic seed drill machines and other machines or installations in which, in order to simplify the design and increase its operating safety, the rotor has blades (5) which are mounted in between two disks with elongated holes, by using the hooks (a) on the blades, without any other assembling elements, which retains the disks in a stack. After the hooks of the blades are inserted in the elongated holes of the two disks, the blades are pushed so that they fix the stack, and are maintained in this position by a disk (8) which prevents their displacement, or by local deformation of one of the walls of the rotor. The negative pressure is adjusted by absorbing air from the atmosphere through an adjustable section slot located on an element that ensures connection with the chamber in which negative pressure is created. A piece (9), which is made up of one or more tapered surfaces connected to each other, contains the elements for assembling the rotor body to the axle, and prevents displacement of the blades.