PURPOSE: To reduce the generation of vibration through suppression of the occurrence of pulsation during the forced feed of ready-mixed concrete.
CONSTITUTION: Two concrete cylinders 2L and 2R are arranged on the front wall of a hopper 1. A swing valve 6 is oscillated in the hopper 1 and the opening part of the tip part thereof is selectively connected to the suction and discharge ports 3L and 3R of the concrete cylinders 2L and 2R. By extruding the extrusion piston 16R of the concrete cylinder 2R to which the swing valve 6 is connected, ready-mixed concrete in the concrete cylinder is fed to the swing valve 6. When the extrusion piston 16R is about to be extruded approximately to an extrusion position, an extrusion piston 16L on the other side waiting in a retracting position after suction of ready-mixed concrete is already completed is simultaneously extruded. This constitution oscillates the swing valve 6 in such a state that concrete is delivered from the two concrete cylinders 2L and 2R and switches connection to that to the concrete cylinder 2L on the other side.
YOKOYAMA TAKASHI
FUJITSUKA MASANAO
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