Viscous material pump, particularly for concrete

US4343598A · kind A · utility

Assignee

• Friedrich Wilh. Schwing GmbH · DE

Inventors

• Friedrich Schwing · Herne, DE
• Gerhard Schwing · Herne, DE

Key dates

• Filing date: Mar 14, 1980
• Grant date: Aug 10, 1982
• Expiry date: Mar 14, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S417/90
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A valve structure for a viscous material pump having a material reservoir, a pair of alternately operable material conveying cylinders, discharge conduit means, and a valve control means coupled to the valve structure and to the material conveying cylinders. The valve structure has a pair of movable swivel pipes extending between the conveying cylinders and the discharge conduit means. Each of the swivel pipes has an opening movable over one of the conveying cylinders to receive the contents discharged therefrom and a plate movable over said one conveying cylinder to block same. The swivel pipes are movable by said valve control means among a first position in which said conveying cylinder is open to the reservoir to receive viscous material therefrom during the suction cycle of the cylinder, a second position in which said plate blocks said conveying cylinder during a portion of the supply cycle thereof to compress the material, and a third position in which the opening communicates with said cylinder for receiving the contents discharged therefrom during the remainder of the supply cycle for delivery to the discharge conduit means.