48m 5RZ type positive folding arm frame concrete pump truck and manufacturing method thereof

The invention relates to a 48m 5RZ type positive folding arm frame concrete pump truck and a manufacturing method thereof. The arm frame comprises an arm frame system, a power system, a pumping system, an electric system and a hydraulic system, and is characterized in that the five-joint arm frame adopts a fulcrum RZ type folding, wherein the three joints of arms at the tail end adopt a reverse pulling and positive folding way. Support legs adopt JX type, a front support leg adopts an X type support leg and a two-joint telescopic support leg way, and a rear support leg adopts a J type swing type; a slewing mechanism adopts a single-speed reducer idler wheel rotating mechanism; and a main oil cylinder adopts a guide sleeve and piston rod sealing structure, the design of the large-cylinder diameter long-stroke pumping system and the design of an independent large-volume oil tank are adopted. An oil cylinder of the arm frame has a two-way interlocking function, so that the safety and the reliability in working of the arm frame can be effectively ensured and the intelligent degree of the whole system is higher. All the elements can work independently without mutual interference. The product disclosed by the invention has the characteristics of energy conservation, high efficiency, intelligence and low labor intensity of workers and can be widely applied to urban buildings, bridges, foundation construction and other projects.