A concrete pump uses hydraulic power to drive the main oil cylinder, which pushes the pistons in the delivery cylinders to reciprocate alternately. Together with the switching of the S pipe valve (swing valve), it completes the suction and discharge cycle. When one piston retreats, concrete in the hopper is drawn into the delivery cylinder; at the same time the other piston moves forward and presses the concrete in its cylinder into the delivery pipeline, continuously conveying the concrete along the pipe to the pouring point. The agitator in the hopper keeps stirring the material to prevent segregation and caking, ensuring smooth feeding. The whole hydraulic system controls pressure and flow, and the pumping speed can be adjusted to the working conditions; the inner wall of the pipeline withstands the high pressure that pushes the aggregate. Different models work on the same principle; the differences lie in hydraulic pressure and cylinder specification, which determine the conveying distance and the applicable aggregate. Widely used in building construction, it can convey ordinary concrete and fine aggregate mortar and, with different pipelines, handle vertical high-rise and long-distance horizontal conveying. It is the core equipment for continuous concrete placing.