At present, the production of large and medium-sized fan blades at home and abroad adopts step-by-step preparation and bonding molding processes, that is, the upper and lower shells and core beams of the blades are first made respectively, and then bonded into one body. This process has three shortcomings. First of all, since the strength of the adhesive is lower than that of the upper and lower shells of the composite material, the strength of the bonded blade is far less than that of the blade formed integrally in one step (Connecting without using any adhesive) has high strength; secondly, it is generally difficult for multi-step forming to ensure the processing accuracy, bonding positioning accuracy and compaction accuracy of blade shells, core beams and other parts in each section, directly affecting the shape accuracy and actual efficiency of the blade after forming unless there are very skilled technicians and complete mechanized processing equipment; Thirdly, each component in the step-by-step preparation requires a special mold. There are many molds, a large factory floor area, and a long production cycle. The new technology we invented is to use the smart core to form the blade in one step, without using any binder, which improves the mechanical strength of the blade. The direct effect is that the amount of material can be significantly reduced; due to the adoption of the smart core, the smart core expands to form a high enough extrusion force when the blade shell is cured, so that the shape of the formed blade is the same as the designed shape, which can ensure the aerodynamic efficiency of the blade; Since this high-precision blade shape is achieved by the process itself and not by the skills of production employees, the technical requirements of the new technology for employees are greatly reduced; finally, it is also very natural that the production cycle of forming the blade once is compared with the traditional forming method.
The shape accuracy is high and consistent with the shape cavity of the mold, thus eliminating the hidden dangers of inconsistency between the actual shape of the blade and the design shape and reduction of aerodynamic efficiency due to processing errors;
1) High surface finish, no sticky marks, and greater blade output under the same wind conditions;
2) Since no binder is used, the service temperature range of the blade will be wider, and the dangers of lightning breakdown and rainwater penetration will be avoided;
3) The reinforcing fiber is continuous along the cross-section to avoid delamination or cracking of the upper and lower blade shells due to weak bonding;
4) There are few production employees, low technical requirements for employees, and multiple improvement in forming efficiency;
5) Low material consumption, light weight and environmentally friendly.
Application areas:Wind power, cooling towers, wings, etc.
New technology develops 20 kilowatt wind turbine blades (blade length 4. 885m) Process description
Note: The blade weighs 40kg, including the root connection bolt, which is 10.0% longer than another 20kW blade developed by the National Laboratory of Renewable Energy in 2002. 5%, leaf weight increased by 47%, and ultimate bearing capacity increased by 4 times.
See original page on 