1 Main boom is made of grade low-alloy and high strength steel with hexagonal profile and big circular are being of great load-bearing capacity, light weight and smooth guiding.

2-section jib, lattice type changeable cross section structure with fine load-bearing capacity, light-weight, 10o, 20o of installing angles can be realized of option.

3 Slewing table "Box" type traditional structure with pressed channel steel for upper cover is made of 60kg grade Low-alloy and high-strength steel with the stability.

4 Telescopic mechanism: adopting our mature technologies of combing two single double-acting cylinders with 2 sets of wire rope. The boom section II is telescoped by cylinder No.1 and the boom section III, IV, V can realize its synchronous telescoping by combining of cylinder No. 2 and 2 sets of wire rope. This kind mechanism can warrant its compact structure, good technological design and reliable working.