Research On The Anti-backward Device Of Luffing Jib Tower Crane

Huge luffing jib tower crane is widely used in the building construction, Especially in the high-rise building construction, its utilization of the amplitude is higher than other types of cranes. Under the conditions of the minimum operating range, the tower crane suddenly unload, due to the elastic force of luffing pull plate, without the protect of the dependable anti-backward device, it will easily lead to the boom suddenly backward, and even lead to the dangerous accident of machine backward. Therefore, there is important meaning to research the design of the anti-backward device.In this thesis, the1600t·m huge moving arm tower crane is taken as the research object, research the anti-backward device of huge luffing jib tower crane based on virtual prototype technology. The mainly study of this paper as following:(1) The finite element model of the boom, Renzijia and tower are established using ANSYS software, the rigid body model of the rotary bearings and balance arm are established using Pro/E3-D modeling software. ADAMS software create the luffing pull plate and anti-backward device. Finally, all components are assembled into a complete virtual prototype model in ADAMS.(2) Make simulation for the anti-backward device designed by experience and analyze the effect of the anti-backward device. Select the78m boom as the object of the research, and analyze dynamic performance of the machine.(3) Study on the impact of the changes of the main parameters on the effect of the anti-backward, such as the stiffness of anti-backward spring, the location of the anti-backward device hinge point, find the best combination of parameters of the impact of anti-backward, and compared with the anti-backward device designed by experience, provide reference for the design of the anti-backward device.