| 摘要 |
This invention relates to a conveying device for conveying pulverized, granular, fibrous or fluid materials, composed of a fixed cylindrical tube, a helical conveying element and a cylindrical central core. The conveying spiral occupies substantially all the space between the tube and the central core. To each speed of the spiral there corresponds a well determined output. The output is controlled by adjusting the speed of rotation of the spiral.
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