SINGLE-CYLINDER PLUG PIN TYPE TELESCOPIC ARM, TELESCOPIC METHOD THEREOF AND CRANE HAVING TELESCOPIC ARM

摘要

FIELD: mechanical engineering.;SUBSTANCE: invention relates to a single-cylinder plug pin type telescopic arm, a crane and a telescopic method thereof. single-cylinder plug pin type telescopic arm includes a basic arm and at least one telescopic arm sleeved in the basic arm. Coaxial centre holes are formed in the tails of the telescopic arms, and a telescopic oil cylinder is arranged in the centre holes. Telescopic oil cylinder includes a cylinder rod and a cylinder barrel, at least two cylinder heads are fixedly sleeved on the outer side of the cylinder barrel in a longitudinal direction, and at least three arm pin holes are formed in each of the basic arm and the telescopic arms in the longitudinal direction. Single-cylinder plug pin type telescopic arm employs one telescopic oil cylinder and at least two cylinder heads. Each cylinder head is adapted to lock and unlock the telescopic oil cylinder and any telescopic arm.;EFFECT: weight of the upper turning part of the crane is reduced, load capacity is improved and the space of the structural parameters of the crane is increased.;15 cl, 42 dwg