FIELD: transportation, packaging and storage of goods or materials.
SUBSTANCE: method is carried out in a pneumatic conveying system, which comprises at least one material input point, a material conveying pipe, which can be connected to the input point, and a material container in which the material being transported is separated from the transporting air, and also means for producing a partial vacuum/a pressure difference and/or a transporting air current in the conveying pipe, at least when transporting the material, which means comprise at least one partial-vacuum source. In the method the suction side of the partial-vacuum source is connected to act in the conveying pipe and onwards to an input point arranged in the conveying pipe, or to act at least in the feeder channel that is between the conveying pipe and the input point. Input point or at least the feeder channel that is closest to the material container in the conveying direction of the material empties, and the material displaces into the conveying pipe, that arranged in the input point, on the inside of said input point and on the opposite side of the input aperture with respect to the feeder channel, is a shut-off element, which is moved by means of the suction produced by the partial-vacuum source from a first position, in which the shut-off element does not make the pathway through the input aperture into the feeder channel considerably smaller, into a second position, in which the shut-off element does make the pathway through the input aperture into the feeder channel considerably smaller, when the pressure on the first side, on the feeder channel side, of the shut-off element is smaller than on the second side, on the opposite side with respect to the feeder channel, of the shut-off element. Invention also relates to an input point and to a pneumatic material-conveying system in which said shut-off element is used.
EFFECT: group of inventions provides for improved conveyance and improved safety.
25 cl, 13 dwg
