| 摘要 |
The invention relates to a conveying pipe for conveying abrasive materials, in particular a bent pipe length for installation in pneumatic packing lines, which comprises an inner pipe (4) of preferably circular cross-section and an outer pipe (5), the internal diameter of which is preferably at least 15 mm greater than the external diameter of the inner pipe (4). The cavity (6) formed between the pipes is filled with a hardenable, free-flowing mass, for example a watery ready-mixed concrete mixture, which has a high wear resistance after hardening. In a preferred embodiment of the invention, the outer pipe (5) bears against the inner pipe (4) along a narrow contact surface, forming a sickle-shaped cavity. The contact surface extends in the longitudinal direction of the pipes and, in the case of bent pipes, in the region of the inner curve (7) of the bend. <IMAGE>
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