Knuckle boom truck-mounted crane, the whole machine adopts finite element lightweight design, with light weight and small installation space; compact and beautiful structure; the new hexagonal arm section has greater lifting capacity at the same amplitude and strong cross-section resistance to bending and torsion ;Double-cavity large-span outrigger structure, better operating stability; The rack cylinder is used to drive the rotation, the rotation is smooth and powerful, easy for maintenance, and the rotation angle can reach 400°; The use of rotatable outriggers improves the foundation for site adaptability It has a larger span to improve the stability of the whole machine; it has a reverse angle design and is more adaptable to the working environment; it is equipped with a high-power radiator as standard to ensure that the oil temperature of the crane is not too high during long-term heavy-load operation; it is equipped with L as standard -HM (CY) XCMG’s special wide-temperature hydraulic oil can be used in winter and summer.