·Transparent observation tube: PC, a polycar bonate material, is set at the discharge end of the feeding tower to facilitate viewing the feeding situation;

·Material line sensor: AC 220V, three core capacitance; It is assembled on the transparent observation tube and set at the rear end of the end most feeder. When the end most feeder is full of material and the feed runs to the sensor, the sensor sends a signal to the driver to close the feed line and stop.