CONCRETE PUMPING STRUCTURE

摘要

A concrete pumping structure comprises a conveying cylinder (1), a water tank (3) and a driving oil cylinder (4). The conveying cylinder (1) is provided with a concrete piston (2). A piston rod (5) of the driving oil cylinder drives the concrete piston to reciprocate in the conveying cylinder (1) when pumping is proceeding. The water tank (3) is located between the conveying cylinder (1) and the driving oil cylinder (4). An auxiliary oil cylinder (7) for returning the piston located at the end of the driving oil cylinder is arranged inside the driving oil cylinder, and a moveable auxiliary oil cylinder piston (12) is arranged in the auxiliary oil cylinder (7) for returning the piston so as to restrict the piston rod to bring the concrete piston back to water tank when working or allow the piston rod to bring the concrete piston back to water tank when returning the piston. Due to the present invention, not only the concrete piston is convenient to replace, but also the length of the integral pumping mechanism is reduced and therefore the whole structure is compact. Furthermore, the pumping structure can be installed in less space and has lower weight.