Apparatus for conveying particulate materials

Claim 1

Apparatus for conveying-away metal chips or other materials, which transmit an energy initiated into them onwards in the direction of introduction of the energy with minimal loss, comprising a channel which extends from at least one material supply station to a remotely located material delivery station, and drive means for moving said materials through the channel, characterized in that the channel is an inwardly smooth conveying pipe (10), and the drive means includes a tubular housing (12) and a worm (14) rotating in said tubular housing (12) and reciprocably driven in axial direction, said worm including a worm tube and an axial drive disposed in said worm tube, said axial drive having a piston (21) which can be stressed on both sides with pressurized medium and which is disposed in the axis of the worm and is connected to the worm tube (17), the cylinder of which piston consists of an axially fixed tube (24) provided with a rotational drive (30-34), said fixed tube being disposed between the worm tube and the piston, while the pressurized medium supply line (48) extends centrally through the piston so that pressure can be applied to one side (23) of the piston.