Worm pump for transporting paste material, e.g. poured asphalt, has worm whose surface is of relatively soft material and stator surface enclosing worm of relatively hard material

摘要

The worm pump has a worm whose surface is of relatively soft material and a stator surface enclosing the worm of relatively hard material. The worm is mounted inside the stator so as to be simple to remove. The surface of the stator consists of a machined plastic and the surface of the work is not hardened.