Concrete-pumping device

Pumps – Motor driven – Relatively movable pumping members driven by relatively...

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417900, 417344, F04B 1700

Patent

active

051143194

ABSTRACT:
Concrete-pumping device comprising a frame, a number of pump cylinders mounted on the frame which comprise a pump opening close to one end, sealed pump pistons which are guided slidably in the pump cylinders toward and away from the pumping device and which are each coupled to reciprocal driving to the plunger of a coaxially arranged hydraulic jack, hydraulic switching means for cyclically feeding to and discharging from the jack hydraulic oil under pressure such that the plunger causes the reciprocating movement of the pump piston and concrete switching means for alternately placing the pump opening in communication with a feed funnel and a pressure conduit for concrete synchronously with the movement of the pump piston in order to pump concrete out of the feed funnel into the pressure conduit. This comprises at least three pump cylinders with associated hydraulic jacks and the hydraulic and concrete switching means are embodied such that each time before a pump cylinder has completed a pressure stroke another pump cylinder has already completed the suction stroke and the pump opening of this other pump cylinder is connected to the discharge line, and that the pressure stroke of this other pump cylinder immediately begins at the moment the pressure stroke of the one pump cylinder has been completed.

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patent: 4714411 (1987-12-01), Searle

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