System detecting and excluding metal foreign bodies from granular or powder products, comprises purpose-built plastic vibro-conveyor surrounded by detector coil with control system and rejector unit

摘要

A vibro-conveyor (1) comprising a trough (2) with plastic section includes a detector for foreign bodies in the product stream. An Independent claim is included for the method of making the multilayer conveyor trough used. The heated mold containing the plastic mixture at its melting point, is rotated about axes to form the layer. Further layers are introduced similarly, in succession. The molding is extracted and finished. Preferred features: Metallic bodies are detected. A conveyor trough overhang extends through a detector coil (21). The output side (4) of the trough has a separator (10, 11) for detected foreign bodies, operated by an electronic controller (30) receiving the detection signal. An electromagnetic vibratory drive (6) of the conveyor is thyristor-controlled (8). Embedded nut-insert fastenings are included. Attachment of the drive mounting is described. It can be held using magnets or screws during molding. The conveyor includes an integral mounting for the drive.