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US 5,184,892 AGranted
System and method for continuous gravimetric metering, pneumatic conveying and/or mixing of pourable materials
AssigneePfister GmbH
InventorHans W. Hafner
Life of this patent
Estimating the term…
Abstract
A system and method for continuous pneumatic gravimetric metering and/or mixing of pourable materials using at least one gravimetric metering apparatus incorporated in a closed loop air conveying path.
Claims19
A system for continuous pneumatic gravimetric metering of pourable materials comprising:
- a gravimetric metering apparatus including a housing having arranged therein a rotatable rotor having pockets, a charging aperture provided in said housing for charging material into the pockets, a discharging aperture provided in said housing offset in direction of rotation of said rotor in respect of said charging aperture for discharging material from the pockets, and means for supplying a pressurized gas to discharge material from said pockets and convey said material;
- a pourable material charging means arranged at said charging aperture of said housing;
- pourable material discharging means arranged at said discharging aperture;
- a closed loop pneumatic conveying path for said pressurized gas including separating means for separating said gas from said metered and conveyed pourable material, said separating means further comprises a metered pourable material collecting means arranged at the output said of said separating means, and control means settable according to a desired conveyed mass of pourable material per time unit and responsive to a metered quantity for controlling mass through-put through said system.
1 more element
A system for continuous pneumatic gravimetric mixing of at least two pourable materials comprising:
- for each pourable material, a gravimetric metering apparatus including a housing having arranged therein a rotatable rotor having pockets, a charging aperture provided in said housing for charging material into the pockets, a discharging aperture provided in said housing offset in direction of rotation of said rotor with respect of said charging aperture for discharging material from the pockets, and means for supplying a pressurized gas to discharge material from said pockets and convey said material;
- a pourable material charging means for each metering apparatus;
- a separate gas supply duct and a separate discharging duct for each metering apparatus;
- a pneumatic conveying path including a common gas conveying means communicating with each discharging duct,
- a common metered pourable material separating means connected to said common gas conveying means for separating gas from said pressurized gas conveying said metered pourable materials, and
- control means adapted to be set to desired values of a mixing ratio, desired quantities of conveyed pourable material per time unit, and for receiving current values thereof for controlling pourable material through-puts of the individual metering apparatuses.
3 more elements
Dependencies are inferred from the claim text.