Operating Manual Hopper loader

5 Structure and function
Function METRO 0.5 to 1.5
Fig. 5.2 – Functional diagram of the METRO H 0.5/1.5 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 switch
The aspirated air forms a mixture of air and granulate in the material line. The granulate falls down
by gravity when it enters the hopper loader. The dust particles in the granulate pass through the
screen filter and are removed by the central filter. This removes dust from the granulate at the same
time.
Depending on the specified conveying time the vacuum valve closes to form an airtight seal. Because
of 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 the
weight 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 on
the filter opens, the blower aspirates fresh air and switches off after a specified run-on time. This
reduces the load on the blower station.
If a hopper loader reports material required again to the controller, the blower station is switched on
and a new loading cycle starts.
22 Edition: November 2005