Patent · US Expired

Device and method for controlling a two cylinder thick matter pump

US7611331B2 · kind B2 · utility

3Cited by

6References

19Claims

0Family size

Assignee

Putzmeister Concrete Pumps GmbH · DE

Inventors

Stefan Hoefling · Seligenstadt, DE
Wilhelm Hofmann · Niederdorfelden, DE
Wolf-Michael Petzold · Esslingen am Neckar, DE

Key dates

Filing date	Mar 18, 2005
Grant date	Nov 3, 2009
Priority date	—
Expiry date	Apr 14, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S417/90
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A device and a method for controlling a two-cylinder thick matter pump comprising pistons that are actuated in a push-pull manner by means of a hydraulic reversible pump (6) and hydraulic drive cylinders controlled by said pump. To ensure a reliable operation of the pump the expected length of the stroke of the pistons (8, 8′) in the drive cylinders (5, 5′) is measured and recorded, the stroke time of each conveyance stroke is monitored and compared with the expected stroke duration, and the reversible pump (6) is respectively pivoted, reversing the flow, and/or the pipe switch (56) is reversed when the stroke time exceeds the expected stroke duration by a pre-determined value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.