Method for checking strength performances of variable-pitch bearing and hub connecting bolt and variable-pitch bearing and vane connecting bolt of fan
A pitch bearing and blade connection technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of incomplete load transmission paths between fan pitch bearings and hub and blade connection bolts, and inaccurate calculation strength performance. and other problems to achieve the effect of reducing workload, improving reliability, and saving time and cost
Inactive Publication Date: 2015-12-16
XUJI GRP +2
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[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and proposes a checking method for the ultimate strength of the connecting bolts between the pitch bearing of a fan and the hub and blades, which is used to solve the load of the connecting bolts between the pitch bearing of a fan and the hub and blades in the prior art The transmission path is incomplete, resulting in inaccurate calculation of the strength performance. At the same time, the invention also proposes a checking method for the fatigue strength of the bolts connecting the pitch bearing of the wind turbine to the hub and blades.
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[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0026] The method of checking the ultimate strength of the connecting bolts between the wind turbine pitch bearing and the hub and blades is as follows:
[0027] 1) if Figure 1-3 As shown, on the drawing software (such as CAD), the blade root part 1, the blade flange 2, the inner ring of the pitch bearing 3, the outer ring of the pitch bearing 4, the hub 5, the pitch bearing and the hub are connected on the drawing software (such as CAD) Bolt 6, pitch bearing and blade connection bolt 7 establish a periodic geometric model, and use finite element software to use solid element meshes for the above parts and assemble them to establish a finite element model. The load transfer path of this model is complete and consistent with the actual situation.
[0028] 2) Apply corresponding attributes to each part of the finite element model, where the ro...
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The invention relates to a method for checking strength performances of a variable-pitch bearing and hub connecting bolt and a variable-pitch bearing and vane connecting bolt of a fan. By utilizing three-dimensional cartographic software, three-dimensional geometrical models of devices in a load transmission path of the variable-pitch bearing and hub connecting bolt and the variable-pitch bearing and vane connecting bolt of the fan are subjected to grid division and assembly separately, and a finite element model is established through finite element software to realize that the load transmission path is complete and consistent with the reality. The devices in the load transmission path at least include a hub, a vane root part, a vane flange, a variable-pitch bearing inner ring, a variable-pitch bearing outer ring, the variable-pitch bearing and hub connecting bolt and the variable-pitch bearing and vane connecting bolt. The method realizes the complete load transmission path, is capable of accurately calculating the limit strength and fatigue strength of the variable-pitch bearing and hub connecting bolt and the variable-pitch bearing and vane connecting bolt of the fan, and improves the operational reliability of a wind power unit.
Description
technical field [0001] The invention relates to a method for checking the ultimate strength and fatigue strength of connecting bolts between pitch bearings of wind turbines and hubs and blades, and belongs to a method for checking the strength performance of large-scale structural bolts of wind turbines. Background technique [0002] At present, most MW-level wind turbines are variable-speed and variable-pitch fans, and the pitch bearing is one of the main components of the wind turbine. When the external wind condition exceeds the rated wind speed, the pitch of the motor is implemented through the pitch bearing. Therefore, the connecting bolts of the pitch bearing play a key role in the safe operation of the pitch bearing. The pitch bearing connecting bolt is one of the most important connecting bolts of the wind turbine. On the one hand, the pitch bearing bolt connects the wheel hub with the pitch bearing outer ring; on the other hand, the pitch bearing bolt connects the b...
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IPC IPC(8): G06F17/50
Inventor 齐涛董姝言苏凤宇晁贯良何海建程林志史航
Owner XUJI GRP
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