The invention discloses a telescopic arm structure, a suspension arm structure and a crane, and relates to the field of engineering machines. The telescopic arm structure is used for improving the alignment accuracy of a pin hole in a first knuckle arm and a pin hole in a second knuckle arm and comprises the first knuckle arm and the second knuckle arm. The telescopic arm structure further comprises a first limiting piece and a second limiting piece. The first limiting piece and the first knuckle arm are fixedly connected. The second limiting piece and the second knuckle arm are fixedly connected. The second knuckle arm moves to the stretching-out position relative to the first knuckle arm. The first limiting piece and the second limiting piece make surface-to-surface contact so as to restrain the second knuckle arm from continuing stretching out. According to the technical scheme, the first limiting piece and the second limiting piece are added, the second knuckle arm is limited by the adoption of surface-to-surface contact, the contact area between the first limiting piece and the second limiting piece is large, the probability that the first limiting piece deforms can be decreased, the limiting collision stress state of the second knuckle arm is improved, and deformation is decreased, so that limiting is more accurate.
Telescopic arm structure, suspension arm structure and crane
2015-10-21
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |
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