1. Ductile cast iron is generally preferred as the hub material of wind turbines. After the hub is cast, it must be physically and chemically inspected. The casting blank must not have cracks, shrinkage cavities, shrinkage porosity, blisters and other casting defects.
2. Measure the actual distance between the longitudinal centerline of the wheel hub and the upper spindle surface from the marking platform, and calculate the machining allowance at the same time as the machining allowance of the upper and lower spindle surfaces; use the upper and lower spindle blanks Use the outer circle or the blank hole as a rough reference to find the centerline of the spindle hole, and then use the centerline as a reference for the upper and lower parts to draw the distance lines between the centerline and the three blade mounting surfaces. The distance between this line and the blade mounting blank surface is For the machining allowance of the blade mounting surface, check whether the machining allowance on the three blade mounting surfaces is uniform. If there is a large deviation in the machining allowance, adjust it one by one until the machining allowance of the three blade mounting surfaces is uniform.
3. The alignment datum for vertical lathe processing generally adopts a scribed flat line.
4. After the vertical lathe processing is qualified, the processing of the three major blade mounting surfaces is completed by a CNC boring machine. The deviation of the marking is verified using CNC boring machine programming, and the three major blade mounting surfaces are accurately processed. The exact size is guaranteed by tooling fixtures and CNC programming. Calculate the Y-direction centerline of the three major blade mounting surfaces based on the datum on the positioning seat, and then divide it into three equal parts at 120° across the horizontal direction of the blade mounting surfaces to determine the equally divided positions of the three major blade mounting surfaces.
4. After the main shaft hole of the wheel hub and the three major blade mounting surfaces are processed, the screw holes on the mounting surfaces in other directions are generally processed using drilling fixtures. The positioning is accurate and the position and size are fully guaranteed. After mechanical processing is completed, all exposed burrs and sharp corners must be polished smooth and flat.
With the gradual increase in the size of wind turbines, the current main transportation method of wind turbines from the factory to the construction site is to transport the three major components of the wind turbine separately: the nacelle, the generator and the hub. Transportation alone requires a large number of engineering vehicles. At the same time, the three major components need to be reassembled and debugged at the construction site. Due to the large size and heavy weight of the components of the wind turbine, a large amount of engineering equipment is required during the assembly process, which is time-consuming, costly and low in work efficiency.
In the existing technology, the nacelle, generator and hub of the wind turbine have been assembled and debugged before leaving the factory, and the transportation tooling structure is used to transport the wind turbine as a whole to the construction site. However, The existing transportation tooling structure has little applicability. Wind turbines often need to be transported not only on land, but also on rivers or seas. However, the existing transportation tooling structure has a relatively large structure and high dimensions. When transported on rivers, If you encounter bridges and other buildings, it is easy for transport ships to be unable to pass due to height issues, affecting the construction process.