公开(公告)号：EP3138805A4

公开(公告)日：2017-12-13

申请号：EP14892857

申请日：2014-05-20

申请人： XUZHOU HEAVY MACHINERY CO LTD

发明人： ZHANG HAIYAN ,  HU XIAODONG ,  LU CAOBIN ,  LIANG JINGWEN

IPC分类号： B66C23/70 ,  B66C23/62 ,  B66C23/687

CPC分类号： B66C23/708 ,  B66C23/62 ,  B66C23/701

摘要： The present invention relates to a telescopic device of single-cylinder latch type and a crane. The telescopic device of single-cylinder latch type is applied to a telescopic boom system and includes: a telescopic cylinder, for driving telescopic boom sections of the telescopic boom system to execute a telescopic action relative to a basic boom section; double boom pin structures, arranged on both sides of the tails of the telescopic boom sections to lock and unlock the telescopic boom sections; an boom pin pulling and plugging mechanism, arranged on the cylinder barrel of the telescopic cylinder to execute pulling and plugging operations on the double boom pin structures; and a cylinder pin structure and a cylinder pin cylinder, both arranged on the cylinder barrel of the telescopic cylinder and to lock and unlock the cylinder barrel of the telescopic cylinder and the telescopic boom sections. In the present invention, the double boom pin structures are arranged on both sides of the tails of the telescopic boom sections, compared with the existing upper boom pin solution, the double boom pin structures in the present invention are arranged on both sides of the telescopic boom sections, so that the stress is more uniform compared with a structure which is singly arranged on the upper side of a telescopic boom, and the influence of flexural deformation of a telescopic boom on the position of a pin hole and the stress of an boom pin is reduced.