| 摘要 |
<p>The device for the transportation of flowing materials in pulverulent, granular, pasty, granulated or lump form in a tube (14) comprises a coaxial endless screw (16) which is rotatable in the forward or reverse direction and means for driving said screw. The means enable to obtain a feed motion without rotation and a rearward motion with a regular rotation of the endless screw (16) so that the material to be transported (20) remains axially stationary (A) during the rearward motion. Owing to the very dense column of material to be transported the bearings may be suppressed; if they are provided, they will have to be arranged outside the conveying stock (20). The endless screw (16) is designed as a single piece screw and the distance between the screw (16) and the tube (14) is slightly bigger than the average size of the grains or lumps of material to be conveyed. The device is preferably used for the supply of pneumatic or hydraulic conveyers.</p> |
