Direct mold for rotor blades for wind turbines

1. A direct mold for molding at least a part of a rotor blade of a wind turbine, the direct mold comprising:

a plank frame, wherein the plank frame is made of a plurality of planar panels, which are aligned transversely to a longitudinal extension of the part of the rotor blade to be molded, and are arranged a spaced apart distance with respect to each other one after another in a direction of the longitudinal extension of the part of the rotor blade to be molded; and

a mold surface body held in shape by the plank frame, wherein the plurality of panels of the plank frame each have an inner contour on which the mold surface body is supported,

wherein the plurality of panels reproduce in their sequence in the plank frame mainly a progression of a contour of the part of the rotor blade to be molded, wherein the mold surface body has a layer structure, which comprises a support layer and a sandwich layer,

wherein the support layer is made of rails, which are aligned in the direction of the longitudinal extension of the part of the rotor blade to be molded in a manner bridging the spaced apart distance between the panels,

wherein the sandwich layer is arranged on the support layer and comprises a multilayer laminate structure, a surface of which is at least one of milled and painted and has the contour of the part of the rotor blade to be molded,

wherein each of the plurality of panels is reinforced with at least one hollow carbon support beam, which is separate and distinct from the mold surface body, and which is received within a recess, said at least one hollow carbon support beam extending in the direction of the longitudinal extension of the part of the rotor blade to be molded and forming part of a backbone of the plank frame,

wherein each of the plurality of panels is a composite-sandwich panel,

wherein each of the plurality of panels comprises interconnected panel segments, and

wherein each of the plurality of panels is segmented in such a manner that the at least one hollow carbon support beam is inlayable into the recess before the panel segments are interconnected.

2. The direct mold according to claim 1 , wherein the direct mold is arranged in a steel substructure.

3. The direct mold according to claim 1 , wherein the sandwich layer only has a direct adhesive connection in a root area of the part of rotor blade to be molded.

4. The direct mold according to claim 1 , wherein a near-surface layer of the laminate structure is adapted to be heated so as to define a heatable layer, and wherein the heatable layer is heated with at least one of heating elements of a water heater laminated into the heatable layer, a carbon heater with carbon filaments, and an electrical heater.

5. The direct mold according to claim 4 , wherein a heat-conducting structure that includes at least one of a wire mesh and temperature sensors is embedded into the heatable layer of the laminate structure.

6. The direct mold according to claim 4 , wherein a heat-conducting structure that includes at least one of a wire mesh and temperature sensors is applied on the heatable layer of the laminate structure.

7. The direct mold according to claim 1 , wherein the sandwich layer has at least one reinforcing layer that includes at least one of PET foam, PVC foam, and balsa wood.

8. The direct mold according to claim 1 , wherein the surface of the mold surface body is painted with a paint layer comprising at least one of polyurethane, vinylester, polyester, epoxy resin, PTFE, and ceramic additives.

9. The direct mold according to claim 1 , wherein the direct mold is assembled from several direct mold segments.

10. The direct mold according to claim 1 , wherein

a total of three hollow carbon support beams are each inlayed in separate recesses in each panel of the plank frame.

11. The direct mold according to claim 10 , wherein a first and a second of the three hollow carbon support beams are smaller than a third of the three hollow carbon support beams.

12. The direct mold according to claim 11 , wherein the first and the second of the three hollow carbon support beams are arranged to provide lateral reinforcement in an area of a leading edge and an area of a trailing edge, respectively, of a profile of the part of the rotor blade to be molded.