Apparatus for pneumatically conveying bulk material

US4909676A · kind A · utility

Assignee

• Waeschle Maschinenfabrik GmbH · DE

Inventors

• Dieter Heep · Bad Waldsee, DE
• Norbert Eberhard · Ertingen, DE
• Hans Hoppe · Weingarten, DE
• Reinhard Ernst · Weingarten, DE
• Robert Storf · Weingarten, DE

Key dates

• Filing date: Apr 28, 1988
• Grant date: Mar 20, 1990
• Expiry date: Apr 28, 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 sectionized by spaced three-way/two-way directional control valves. Each control valve is actuated by a pressure transmitter which compares the actual pressure in the conveyor line with the desired pressure in a third line carrying a fluid at a desired pressure decreasing in downstream direction in accordance with the pressure drop in the conveyor line during normal operation. A communication between the conveyor line and the second line is provided by respective branch lines which define the third connection of the control valves and are multiply connected to the conveyor line. Thus, upon encountering a pressure drop in an area of the conveyor line, the respective pressure transmitter actuates the pertaining control valve which shuts off downstream section of the second line and connects the second line with the conveyor line for introducing clean gas into the conveyor line at the desired area thereof.