Blade root pre-buried connection structure of wind power electricity generation composite material blade and wind power generation equipment

Abstract

The invention discloses a blade root pre-buried connection structure of a wind power electricity generation composite material blade and wind power generation equipment. The blade root pre-buried connection structure of the wind power electricity generation composite material blade comprises a blade root, a blade root pre-buried bolt sleeve and a blade root flange; the blade root pre-buried bolt sleeve comprises a bolt sleeve body and a flange, the flange is located on the end portion of the blade root pre-buried bolt sleeve, the blade root pre-buried bolt sleeve is pre-buried in the hole, matched with the blade root pre-buried bolt sleeve, in the blade root, and the flange protrudes out of the end portion of the blade root; and the blade root is in contact with the surface, close to one side of the bolt sleeve body, of the flange, and the blade root flange is in contact with the surface, away from one side of the bolt sleeve body, of the flange. According to the blade root pre-buriedconnection structure of the wind power electricity generation composite material blade and the wind power generation equipment, not only can the fatigue life and stability of a connecting bolt be improved, but also the production technology of the blade is further optimized, a composite material is prevented from being burned and deteriorated caused by friction heat when the blade root is subjected to grinding, and the production technology is easier to control.

Description

technical field [0001] The invention relates to the field of composite material blades of wind power generating sets, in particular to a pre-embedded connection structure of wind power composite material blade roots. Background technique [0002] There are usually two ways to connect the blade root of the wind turbine blade and the pitch bearing: the T-shaped punching type and the pre-embedded blade root bolt sleeve type. As the length of the blade increases, the megawatt level of the wind power generation unit increases, and the load on the blade also increases. More connecting bolts are arranged at the blade root to ensure sufficient ultimate strength and fatigue strength of the blade root connecting bolts. [0003] The existing pre-embedded structure of wind turbine blade root has the following disadvantages: [0004] (1) In order to facilitate the grinding of high-speed metal grinders, the blade root embedded bolt sleeve generally protrudes from the end face of the bla...

AI Technical Summary

Problems solved by technology

In order to ensure the flatness of the end surface of the embedded bolt sleeve of the blade root, when the end surface is ground, the end surface of the embedded bolt sleeve of the blade root near the mold clamping joint has not been polished, and the end surface of the embedded bolt sleeve of the blade root at other positions has been polished. It is flush with the composite material of the blade root; when the high-speed metal grinder touches the composite material, high-speed friction generates heat, and the composite material is easily burned, resulting in poor mechanical properties

[0005] (2) The area of ​​the end surface of the embedded bolt sleeve of the blade root is small, and when it contacts the end surface of the flange, the rigidity of the connected parts is small, and the fatigue life of the connecting bolts is reduced

[0006] (3) In the traditional embedded connection structure of the blade root, only the bolt sleeve, flange and pitch bearing are the compressed components, and the composite material of the blade root is not compressed, which does not contribute to the stiffness of the connected parts, reducing the pressure of the embedded bolt sleeve. The maximum pull-out force and fatigue resistance of connecting bolts

[0007] The above three disadvantages make it difficult to control the production process of pre-embedded blades. At the same time, during the on-hook operation, the fatigue life of the blade root bolts is short, and the blade root bolts break frequently, which reduces the reliability and service life of wind turbine blades.

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