Operating Manual Hopper loader

5 Structure and functionFunction METRO 06-1 to 30-1Fig. 5.2 – Functional diagram of the METRO H 06/10/15/30 hopper loader[1] Vacuum line[2] Implosion valve open[3] Material tube[4] Discharge flap[5] Inlet flap open[6] Vacuum valve open[7] Inlet flap closed[8] Vacuum valve closed[9] Proximity switchThe aspirated air forms a mixture of air and granulate in the material line. The granulate falls downby gravity when it enters the hopper loader. The dust particles in the granulate pass through thescreen filter and are removed by the central filter. This removes dust from the granulate at the sametime.Depending on the specified conveying time the vacuum valve closes to form an airtight seal. Becauseof the underpressure in the hopper loader the implosion valve now opens suddenly for a short time.The implosion cleans the screen filter after every loading cycle.METRO H**: as a result of the implosion the underpressure in the hopper loader collapses and theweight of the granulate opens the discharge flap. The material flows into the machine bin.The vacuum valve in the hopper loader opens at the next demand. The loading cycle starts.Only one hopper loader at a time can be filled on a blower line.If all hopper loaders are full and no material required is pending at the controller, the bypass valve onthe filter opens, the blower aspirates fresh air and switches off after a specified run-on time. Thisreduces the load on the blower station.If a hopper loader reports material required again to the controller, the blower station is switched onand a new loading cycle starts.22 Edition: February 2006