Integral molding method of composite material blade for wind power generation, and apparatus thereof

Abstract

The invention relates to an integral molding method of a composite material blade for wind power generation, and an apparatus thereof. The apparatus comprises an upper die, a mandrel, a lower die and an electric heating device, the lower surface of the upper die forms a groove matching with the shape of one side of a blade, the upper surface of the lower die forms a groove matching with the shape of the other side of the blade, a glass steel web is arranged between the upper die and the lower die, the mandrel comprises four partition mandrels, the four partition mandrels are respectively arranged above and below the glass steel web, and the surfaces of the four partition mandrels and the glass steel web are respectively wrapped with elastic sponges capable of shrinking in the vacuum pumping process; the upper die and the lower die are respectively provided with exhaust openings, and the exhaust openings are connected with a vacuum pumping device; and the vacuum pumping device vacuumizes after die closing, the elastic sponges on the upper die, the lower die and the glass steel web shrink, epoxy resin is poured, and molding is carried out to form the windward side, leeside and middle reinforcement integrally molded blade. Compared with methods and apparatuses in the prior art, the method and the apparatus have the advantages of effective solving of the cracking problem of blades, and improvement of performances of the blades.

Description

technical field [0001] The invention relates to blade molding, in particular to a method and device for integrally molding composite material blades for wind power generation. Background technique [0002] As a renewable clean energy, wind energy has broad application prospects, and its development and utilization has been highly valued by countries all over the world. Wind power generation is inseparable from wind power blades. Traditionally, the upper and lower molds are formed separately, and the front and rear edges are glued together, which is completely connected by adhesives, which is likely to cause many problems. In a broad sense, the adhesive itself is a high-viscosity pure resin, some of which have added some millimeter-scale chopped fibers or other fillers, but compared with fiber-reinforced laminates, the performance level is very different. In addition, the adhesive is a brittle material with poor toughness and fatigue performance, so the bonding area of ​​th...

AI Technical Summary

Problems solved by technology

The entire system has high efficiency, but the design of the entire mold system is complex and the hardware investment cost is high

At the same time, the requirements for the resin injection machine are also very high, the pressure on the mold is high, the rigidity is high, and the cost is high

Therefore, the RTM process is generally suitable for small and medium-sized composite parts, and its application in the forming process of wind turbine blades is limited.

Images