Pneumatic suction conveyor means for the gravimetric dosing of bulk material components

Pneumatic suction conveyor means for a gravimetric dosing of different pourable materials to a plurality of demand stations, the pneumatic suction conveyor means comprising:

• a plurality of storage containers respectively accommodating one of said materials;
• a plurality of first delivery lines respectively connecting the plurality of storage containers to a distributor;
• a separator provided at each demand station for separating the respective material supplied thereto from the respective storage containers, each of said separators including an upper chamber and a lower chamber;
• a closable discharge opening provided in the lower chamber of each of said separators;
• a plurality of further delivery lines for respectively connecting the distributor to the upper chamber of the respective separators;
• a suction line connected to a suction fan and to the upper chamber of each of said separators;
• stop valve means provided at each separator for controlling communication between the suction line and the respective separators;
• a weighing container disposed between the upper chamber and the lower chamber of the respective separators for receiving the material separated by the respective separators;
• a transducer means for supporting said weighing container in the respective separators;
• a bottom-side material outlet provided in the respective weighing containers for discharging the material separated by the respective separators into the lower chamber of the respective separators;
• and
• a closure means provided at the bottom-side material outlet of each weighing container, said closure means being responsive to a material demand indicator provided at the associated demand station so as to be brought into a closed position and being adapted to be brought into an open position when a setting device is activated by the transducer means with a set time delay.