Concrete-mortar transfer system of concrete pump car
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United States of America Patent
Stats
-
Sep 12, 2006
Grant Date -
Oct 20, 2005
app pub date -
Jul 26, 2004
filing date -
Apr 19, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A concrete transfer system for a concrete pump car has a pair of concrete input tubes mounted in a hopper, first and second drive cylinders operating with the concrete input tubes for inputting and outputting the concrete by pressure pistons each having a driving rod, an oil pressure pump for supplying oil to the first and second drive cylinders, and a movement sensor for each of the driving rods. A control unit receives a sensing signal from each sensor and there are a plurality of logic valves operated by the control unit that are selectively opened and closed to supply oil to opposite sides of the driving rod of each of the cylinders. A high-low pressure selection valve operates to perform the concrete transfer at either high or low oil pressure.
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