Metal detector for belt conveyer
A technology of metal detectors and belt conveyors, which is applied to instruments, measuring devices, scientific instruments, etc., and can solve problems such as metal detector misoperations
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[0012] The present invention has two sensors L1, L2, and L1 is enclosed within on the belt, and L2 is placed on the lower side of the conveyor belt, and L1 and L2 have respective oscillators, high-amplification, wave detection, and low-amplification circuits. The output end of the sensor L1 amplification channel passes through diodes D21 and D22 to form a positive and negative phase detection circuit, and divides the detected signal into two channels. D21 channel (metal reaction channel) is sent to amplifier IC8, and IC8 outputs to IC10; D22 channel (ore The reaction channel) is sent to the amplifier IC9, and the output of IC9 controls the gate of the field effect transistor V9, and after V9 and the resistor R30 divide the voltage, the output controls the input voltage of the amplifier IC10. For ore materials with high magnetic permeability, the eddy current effect generated will increase the sensor current, and the sensor current will decrease when the metal passes through. A...
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