FOLDABLE BOOM STRUCTURE AND CONCRETE PUMP TRUCK

摘要

A foldable boom structure comprises a hydraulic source (6), a main tube (31), a plurality of control valves (4), a plurality of branch tubes (32), a plurality of oil cylinders (2) and a plurality of knuckle arms (1). Every two adjacent knuckle arms of the plurality of knuckle arms (1) are hinged to each other. The plurality of control valves (4) are individually connected to the hydraulic source (6) through the main tube (31), and connected to the oil cylinders (2) through the branch tubes (32) in order to control expansion and retraction of the oil cylinders (2), thereby achieving folding or unfolding of the two adjacent knuckle arms relative to each other. The control valves (4) are mounted on the knuckle arms (1). The boom structure changes the arrangement manner of oil ducts by changing positions of the control valves, thereby reducing the number of the oil ducts and further simplifying the arrangement manner of ducts. Also provided is a concrete pump truck having the boom structure.