CONVEYER METAL DETECTOR Russian patent published in 2000 - IPC

FIELD: mining industry, technological processes of ore dressing. SUBSTANCE: invention can also be used in technological processes of preparation of construction materials to detect metal objects capable of damaging crushing equipment and in dredges to trap nuggets. Conveyer metal detector has two induction probes whose primary windings are connected in series aiding and linked to generator. Pickup coils of induction probes are connected in series opposition and are linked to network composed of amplifier and synchronous detector that isolates quadrature component of signal proportional to conductance of metal and its mass. In- phase component of signal is proportional to magnetic susceptibility of material transported by conveyer and of near-by structures of conveyer and is suppressed by network made of second synchronous detector, integrator, amplifier with controlled gain factor and second phase inverter inserted into given metal detector. EFFECT: increased reliability of detection of metal objects including those in flows of materials displaying magnetic properties. 2 dwg