The basic role of wind turbine flange
In northwestern China, the government has invested heavily in the development of wind energy, of which wind power towers are the key support components for wind power generation equipment. It directly determines the service life of wind turbines, but it also plays a supporting and fixing role in wind power towers Flanges used by wind turbines must be able to withstand the thrust, torque, bending moment, gyroscopic moment, vibrations of the motor, and oscillations of the wind turbine acting on the blades.
The flange under the wind turbine consists of three to four straight or conical tubes connected by high-strength bolts to flanges at both ends to form a tower. Therefore, the flatness of the flange, angle distortion and ovality will directly affect the quality of fan operation, affecting the life of fan equipment. Flange is finished forgings, factory from the flange factory has been done normalizing and tempering, so how to control the three indicators, to avoid the flame orthopedic to control the flatness, leanness, ovality is very meaningful.
In addition, the quality of the tower after welding flange requires the tower into the segment after the flange flatness requirements top flange 0.8mm, the remaining flange 1.5 ~ 2.0mm (according to the requirements of the fan plant is different); flange ovality is 3mm; Flange inverted top flange 0 ~ -0.5mm; the remaining flange 0 ~ -1.5mm. 2 flange and cylinder deformation analysis of the welding At present, the main material used by the wind turbine plant is basically Q345 series of low-alloy steel, flange Q345E-Z25 material requires less than 0.45% carbon equivalent weldability is better.
Therefore, the wind turbine flange welding mainly cylindrical ring weld caused by the longitudinal residual stress σx depends on the cylinder diameter, thickness and width of the weld plastic deformation zone, the stress peak as the cylinder diameter increases and the plate Thick and reduce the increase; and transverse stress σy direct cause from the lateral shrinkage of the weld cooling, flange plate control just right, the cylinder diameter is not easy to be too large, while the cylinder thickness should also be relatively increased.