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A MULTI-CHANNEL SYSTEM FOR DETECTING METAL CONNECTORS IN WASTE WOOD-BASED MATERIALS

Metal connectors in waste wood-based materials should be removed before reused. A multi-channel metal connector detecting system is presented, detecting the metal connectors in waste wood-based materials. It include three parts: a high precision sensor for detecting metal connectors in waste wood-based materials, a multi-channel data logging and processing system based on microcontroller unit, and a model for positioning the metal connectors in waste wood-based materials. The high precision sensor has a magnet and, Holzer element and a differential amplifier and peak detector circuit. The multi-channel data logging and processing system has a micro-controller unit, an 8-channel AD converter and some auxiliary circuits. The model shows the relationship between the positions of metal connectors with the signals from 8 sensors. The experimental results show that the maximal detecting height is 2.0cm for the 0.8х11mm nail, as well as 4.8cm for the 3.5×30mm nail and the position error between the real positions of the nails and those get from the model is less than 1cm. The system can meet the practical needs of the reusing waste wood-based materials.