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 ; The single-cavity nested leg structure has the characteristics of large span, small installation space, and reduces the weight of the product; the rack cylinder is used to drive the rotation, the rotation is smooth and powerful, easy for maintenance, and the rotation angle can reach 420°; equipped with The operation warning light reminds the surrounding people and vehicles, which can reduce accidents and improve operation safety; the equal torque design has stronger lifting performance; the standard L-HM (CY) XCMG special wide-temperature hydraulic oil can be used in winter and summer .