Intensity finite element computing method for wind generating set lifting tool

Abstract

The invention discloses an intensity finite element computing method for a wind generating set lifting tool. The method comprises the steps that firstly, an actual lifting three-dimensional model is built in Solidworks software, then, model simplification is performed in a Workbench, and a finite element computing model is built in a Hypermesh; finally, assembling, parameter setting, loading computing and post-processing are performed in ANSYS, stress of a bolt and a lifting base is analyzed, and the security is checked. Finite element computing is adopted, the influence of the rigidity of thelifting tool on stress distribution and the stress state of the local structure of the lifting tool are considered, and the welding seam with the most risky stress is subjected to intensity analysis;in addition, the influence caused by slippage on bolt stress and hole forming in the binding face portion caused by unbalance loading can be sufficiently considered. Accordingly, the method can moreaccurately and visually reflect the actual stress state in the lifting base and bolt lifting process, and therefore the reliability and safety of the lifting operation are improved.

Description

technical field [0001] The invention relates to the technical field of wind power heavy equipment, in particular to a strength finite element calculation method of a hoisting sling for a wind power generating set. Background technique [0002] In recent years, with the maturity of wind power technology, my country's wind power industry has entered a period of rapid development and has become a major field leading the future of new energy. A wind turbine is a very large piece of equipment, and the weight of the whole machine is usually measured in hundreds of tons. Therefore, the safety of its major components during the hoisting process is particularly important. [0003] The hoisting operation of the wind turbine mainly includes the hoisting of the tower, the main engine, and the impeller system. For different hoisting operations, special hoisting tools will be designed, connected to the hoisting target through high-strength bolts, and then through the corresponding hoistin...

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Problems solved by technology

[0004] At present, engineering algorithms are used in the strength calculation of hoisting slings in the industry. For the strength calculation of the hanger, the engineering algorithm only judges the safety of the hanger by calculating the extrusion strength and shear strength near the eye hole of the lifting lug, without considering the safety of the hanger. The influence of the stiffness of the spreader on the force distribution and the force state of the local structure of the spreader

For the strength calculation of bolts, the engineering algorithm considers that each bolt is uniformly stressed, and is only subjected to tensile and shear forces, without considering the bending moment. At the same time, the engineering algorithm cannot fully consider the separation hole of the joint surface caused by the partial load. , The effect of slippage on the force of the bolt

Obviously, the calculation of the strength of the hanger and bolts is entirely based on engineering algorithms, and the calculation results are optimistic, which is unreasonable. Since the hanger is spliced ​​by many steel plates through welding processes, the welds between the steel plates are the force of the hanger. The most dangerous part, therefore, it is very necessary to carry out strength analysis on the weld

In addition, the bolts are not vertical during the hoisting process, and the pre-tightening force applied will be insufficient, causing the bolts to be subjected to a large bending moment during the hoisting process, and each bolt is not evenly stressed. Therefore, it is impossible to pass The simple average method is used to calculate the strength of bolts, and the influence of bending moment also needs to be considered

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