Apparatus for pneumatically conveying bulk material

US4861200A · kind A · utility

Assignee

• Waeschle Maschinenfabrik GmbH · DE

Inventors

• Paul Lubbehusen · Ravensburg, DE
• Norbert Eberhard · Ertingen, DE
• Hans Hoppe · Weingarten, DE

Key dates

• Filing date: May 4, 1988
• Grant date: Aug 29, 1989
• Expiry date: May 4, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65G53/521
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An apparatus for pneumatically conveying bulk material includes a conveyor line for transporting the bulk material and a secondary line which carries clean gas and is multiply connected via branch line and a plurality of check valves with the conveyor line for allowing introduction of clean gas when the pressure difference as measured between adjacent pressure transmitters exceeds a predetermined value. Adjacent pressure transmitters are operatively connected with a differential pressure switch which actuates a valve regulating the flow of clean gas through the branch line. The differential pressure switch opens the valve as soon as the pressure difference exceeds the predetermined value.