Sectional self-dismounting device for cargo boom of flat-head tower crane

The utility model discloses a segmented self-dismounting device for a cargo boom of a flat-head tower crane. The device comprises a main supporting rod assembly, an inclined supporting rod and a variable-amplitude trolley, the main supporting rod assembly comprises a first long rod, a second long rod, a transverse supporting rod and a pulley. The first long rod and the second long rod are the samein structure, the first long rod comprises a first short rod body, a second short rod body and a third short rod body, a connecting plate is arranged at the upper end of the first short rod body, connecting plates are symmetrically arranged at the upper end and the lower end of the second short rod body, and a connecting plate is arranged at the lower end of the third short rod body. All the components are connected through the pin shafts and the bolts; the device is simple in structure and convenient to assemble, particularly, the two sections of the inclined supporting rod can rotate relatively, hole alignment is m