Concrete-mortar transfer system of concrete pump car

Details Concrete-mortar transfer system of concrete pump car Concrete-mortar transfer system of concrete pump car

2006-09-12

2006-09-12

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Pulsator

C060S422000, C091S529000

Reexamination Certificate

active

07104057

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.

REFERENCES:
patent: 5316453 (1994-05-01), Schwing
patent: 5520521 (1996-05-01), Benckert et al.
patent: 5536151 (1996-07-01), von Eckardstein
patent: 5640850 (1997-06-01), Benckert et al.
patent: 6267571 (2001-07-01), Anderson et al.
patent: 6299416 (2001-10-01), Kwag

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