Automatic folding and unfolding mechanism of folding arm of crane and folding and unfolding method of mechanism

Abstract

The invention discloses an automatic folding and unfolding mechanism of a folding arm of a crane and a folding and unfolding method of the mechanism. The automatic folding and unfolding mechanism comprises a connecting assembly, a lifting arm assembly, a bracket assembly and a folding and unfolding assembly, wherein the bracket assembly is connected with the lifting arm assembly by the connecting assembly; the folding and unfolding assembly is connected with the lifting arm assembly and the bracket assembly by the connecting assembly respectively; the connecting assembly comprises pin shaft pieces and ear plate pieces; the pin shaft pieces comprises first pin shafts, second pin shafts and third pin shafts; the lifting arm assembly comprises a first section arm, a second section arm and a third section arm; the first section arm is articulated with the second section arm by the first pin shafts; the second section arm is articulated with the third section arm by the second pin shafts; and a lower chord of the first section arm is articulated with the tower crane by the third pin shafts. With the adoption of the mechanism and the method, folding and unfolding movement of the folding arm is flexible and smooth; the mechanism has a smaller transportation dimension; and rapid transportation, mounting and dismounting of the crane in a narrow and small space are facilitated.

Description

technical field [0001] The invention relates to the technical field of rapid erection of tower cranes, in particular to a crane, an automatic retracting mechanism of a folding arm and a retracting method thereof. Background technique [0002] Due to its inherent large and stable characteristics, tower cranes are widely used in the transportation of building construction materials and the installation of building components. At present, most of the tower cranes used in the domestic construction industry are old-fashioned fixed-arm tower cranes. The boom and tower body are installed on the base of the tower crane as a whole. The erection and dismantling steps are cumbersome. On-site, such as the repair of cultural relics such as traditional ancient town houses, traditional old-fashioned tower cranes are difficult to adapt to the complex and crowded working environment on the job site, and cannot be quickly and flexibly installed, dismantled and transported. There are many inco...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems in the prior art that tower cranes are inconvenient to install and dismantle, and difficult to adapt to the requirements of construction operations in narrow spaces

Images