DE102014018022A1 - Mold and method for producing a web for a rotor blade - Google Patents

Abstract

The invention relates to a mold for producing a web for a rotor blade, having a first web section resting on a first support surface, having a second web section standing on a second support surface, having an oblique connection surface between the first support surface and the second support surface, with an insert in the region of oblique connecting surface, and having a third support surface having side wall for abutment with the second web portion, namely the first web portion opposite, wherein the side wall extends in particular in the longitudinal direction of the mold or of the rotor blade. According to the invention means are provided for supporting the side wall against the second web portion.

Description

The invention relates to a mold for producing a web for a rotor blade, having a first web section resting on a first support surface, having a second web section standing on a second support surface, having an oblique connection surface between the first support surface and the second support surface, with an insert in the region of oblique connecting surface, and having a third support surface having side wall for abutment with the second web portion, namely the first web portion opposite, wherein the side wall extends in particular in the longitudinal direction of the mold or of the rotor blade.

A form of the kind mentioned is from the DE 10 2011 082 664 A1 known. In a rotor blade for a wind turbine belts and webs are arranged on the inside to accommodate tensile and compressive loads. One or more webs extend in the longitudinal direction of the rotor blade and have a C-profile or double-T profile. According to the profile arise either two L-shaped web feet or two T-shaped web feet.

The webs are typically made in a sandwich construction, namely with a light core surrounded by plastic-impregnated fiber layers, the core having an I-profile.

The web feet are connected in a planar manner with the rotor blade, moreover, or with a belt in a half shell of the rotor blade. Accordingly, the cross-sectional profile of the respective web foot must be adapted to the profile profile of the rotor blade. The angle of the web foot relative to the core is not constant over the length of the rotor blade and can be both above 90 ° and below 90 °.

The bridge is made in a special form by lamination. The shape is designed so that the lamination on the one hand and the subsequent demolding (the release of the web from the mold) are well possible. In particular, web and form should have no undercuts. Due to the over the length of the rotor blade changing profile of the web foot, this requirement can not be met. The mold is therefore provided with a depositor. Corresponding to the insert, the mold has a side wall, against which the web foot or the second web section abuts during production.

The sidewall is in the DE 10 2011 082 664 A1 formed as an angle, wherein a lying on a support surface of the form angle leg is connected to the support surface. An adjustment of the side wall or a special pressure of the side wall on the web foot are not provided.

Object of the present invention is to provide a mold with which the side wall can be adjusted in the manufacturing process or with the side wall pressure on the web foot can be exercised.

The inventive form is to achieve the object characterized by means for supporting the side wall against the second web portion. In contrast to the prior art, the side wall is not simply attached to the mold otherwise. Rather, independent means for supporting the side wall are provided against the second web portion. In particular, can be exercised with the means for supporting pressure on the side wall. The side wall forms in this way a pressure plate. Preferably, the means are designed such that an adjustment of the position of the side wall relative to the mold is otherwise possible.

According to a further idea of the invention, it is provided that the means for supporting the side wall are provided only in sections, ie several times along the side wall. The side wall extends in the longitudinal direction of the rotor blade and is intended to support the second web section over the entire length. In contrast, it is sufficient if the means for supporting the side wall have a relatively short extension in the longitudinal direction of the rotor blade, but there are several times, with sufficient rigidity of the side wall.

According to a further aspect of the invention, it is provided that the side wall is formed subdivided in the longitudinal direction of the mold into successive side wall sections. As a result, the side wall is easier to handle. In practice, the shape and side wall can be over 50 meters in total. Preferably, the side wall portions follow each other without a gap, so shock to impact.

According to a further aspect of the invention, wedges and stops are provided as means for supporting the side wall, wherein the stops at a distance from the side wall at least temporarily (on the mold otherwise) are fixable, and wherein the wedges provided for insertion into spaces between the side wall and stops are. In particular, by the wedges a fine adjustment of the position of the side wall is possible, as well as an adjustment of the pressure of the side wall against the second web portion. Ideally, the stops remain firmly mounted while the wedges are plugged in the manufacture of a bridge and pulled to demoulding. Through the gap between the side wall and stops the side wall for removing the web from the mold can be easily removed. The bridge is then free and can (possibly together with the depositors) are removed from the mold. In addition is over the shape of the wedges make it possible to adapt to the angle of the side wall. The attacks can remain unchanged.

Advantageously, the stops are designed as catches or stop angle. The lugs / angles are inserted into the mold or in particular releasably connected to the mold and each have a stop surface for the wedges.

The invention also provides a method for producing a web for a rotor blade, using a mold with a first web section resting on a first support surface, with a second web section standing on a second support surface, with an oblique connection surface between the first support surface and the second support surface, with a depositor in the region of the oblique connection surface, with a side wall having a third support surface for bearing against the second web section, namely the first web section, wherein the side wall extends in particular in the longitudinal direction of the mold or of the rotor blade.

In particular, it is a method using a mold according to the invention.

• a) der Einleger liegt an der schrägen Verbindungsfläche an,
• b) wenigstens eine Faserlage/Verstärkungslage wird über die erste Stützfläche und den Einleger gelegt, wobei ein Teil der Faserlage/Verstärkungslage am Einleger hinab bis auf die zweite Stützfläche reicht, insbesondere nimmt dabei die Faserlage/Verstärkungslage einen L-förmigen Querschnitt an,
• c) wenigstens eine Faserlage für den stehenden Stegabschnitt wird im Bereich des Einlegers an einen Teil der Faserlage/Verstärkungslage gemäß b) angelegt, wobei auch die Faserlage/Verstärkungslage gemäß c) einen insbesondere L-förmigen Querschnitt aufweist, dabei aber kürzer ist als die Faserlage/Verstärkungslage gemäß b),
• d) die Seitenwand wird auf die zweite Stützfläche gesetzt und dabei an einen Teil der Faserlage/Verstärkungslage gemäß c) angelegt,
• e) die Seitenwand wird gegen die Faserlage/Verstärkungslage für den stehenden Stegabschnitt gedruckt und fixiert,
• f) ein bislang nicht stehender Teil der Faserlage/Verstärkungslage für den stehenden Stegabschnitt wird aufgerichtet und an der Seitenwand fixiert,
• g) der Kern und abschließende Faserlagen/Verstärkungslagen werden in die Form eingelegt.

The invention further provides a method with the following steps:

• a) the insert abuts against the oblique connection surface,
• b) at least one fiber layer / reinforcement layer is laid over the first support surface and the insert, whereby a part of the fiber layer / reinforcement layer extends down to the insert on the insert, in particular the fiber layer / reinforcement layer assumes an L-shaped cross section,
• c) at least one fiber layer for the stationary web section is applied in the region of the insert to a part of the fiber layer / reinforcement layer according to b), wherein the fiber layer / reinforcement layer according to c) has a particular L-shaped cross section, but is shorter than the fiber layer / Reinforcing layer according to b),
• d) the side wall is placed on the second support surface and thereby applied to a part of the fiber layer / reinforcement layer according to c),
• e) the side wall is printed against the fiber layer / reinforcement layer for the standing web section and fixed,
• f) a hitherto stationary part of the fiber layer / reinforcing layer for the stationary web section is erected and fixed on the side wall,
• g) the core and final fiber layers / reinforcing layers are placed in the mold.

The invention also provides a web for a rotor blade, with at least one web foot, which is at least partially substantially T-shaped or C-shaped, produced by a method according to claims 6 or 7 or in a mold according to one of claims 1 until 5.

The invention further relates to a rotor blade with at least one web of the aforementioned type.

Finally, the subject of the invention is also a wind energy plant with at least one rotor blade of the aforementioned type.

Further features of the invention will become apparent from the description, moreover, and from the claims. Advantageous embodiments of the invention are explained below with reference to drawings. Show it:

1 a cross section through a part of a mold with inserted web,

2 - 7 Cross sections analog 1 in the sequence of steps in the manufacture of the bridge,

8th a perspective view of a part of the mold.

A bridge for installation in a rotor blade for a wind turbine should receive a double-T cross-section, thus having a T-foot on both sides. One half or even shorter section of a mold for making the bridge is in 1 shown in cross section, analogous to the right side of the 6 in the DE 10 2011 082 664 A1 ,

The bridge consists essentially of a cuboid but flat core 11 , which of resin impregnated reinforcing layers 12 . 13 . 14 is surrounded. Each of the reinforcement layers 12 . 13 . 14 can itself consist of several layers. In the present case are large outer surfaces of the core 11 from the reinforcement layers 13 . 14 covered while a foot-side frontal 15 of the core 11 from the reinforcement layer 12 is covered. The reinforcement layer 12 also forms together with the reinforcing layers 13 and 14 lateral areas 16 . 17 of the bridge foot. These are the reinforcing layers 13 . 14 in the area of the front side 15 Arranged angled, there are substantially transverse to the main direction of extension of the core 11 and are at the same time at the reinforcement layer 12 at.

The shape for receiving the web is stepped, namely with a horizontal, middle mold wall 18 , in contrast, in parallel plane, namely lower lying lateral mold walls 19 and with sloping mold walls 20 , The latter connect the middle mold wall 18 with the lateral mold walls 19 , In the figures are only on one side of the middle mold wall 18 the lateral mold wall 19 and the sloping mold wall 20 shown. To the lateral mold wall 19 can still have a contrast, angled, downward mold wall 21 connect, see 2 to 8th ,

To complement the shape is on both sides of the middle mold wall 18 one demolding insert each 22 provided, which on the oblique mold wall 20 abuts, while on the lateral mold wall 19 rests and has a substantially trapezoidal cross-section. On the side of the demolding insert 22 comes the side area 17 to lie. At the same time lies on the demolding insert 22 a part of the reinforcement layers 14 ,

Part of the mold is (both sides each) also a removable, upright pressure plate 23 which are essentially along the lateral areas 16 . 17 is aligned or at this with a pressure side 24 is applied. Here is the pressure plate 23 on the associated lateral mold wall 19 ,

Held is the pressure plate 23 at the back (the pressure side 24 opposite) by a plurality, along the longitudinal extent of the pressure plate 24 (Arrow 25 ) arranged catches 26 , The cudgels 26 are basically stationary, but preferably detachable with the associated lateral mold wall 19 connected and have a flat, large base plate 27 and a contrast narrow, upright leg 28 on. The base plate 27 is here in the side mold wall 19 admitted. The upright thigh 28 is not directly on the pressure plate 23 at. Rather, it is between thighs 28 and pressure plate 23 a wedge 29 set.

In the illustration according to 8th has the pressure plate 23 additionally in the area of the cudgel 26 a reinforcement 30 on, on which the wedge 29 is applied. The reinforcement 30 guides you through the wedge 29 applied force in the pressure plate 23 and distributes the power over a larger area. Accordingly, side walls are preferably solid reinforcement 30 tilted so that the reinforcement 30 on the wedge 29 has a much smaller contact surface than on the pressure plate 23 ,

Based on 2 to 7 the method for producing the web is explained below:
It is assumed by the form in 2 again only half and shown in cross-section, with merging mold walls 18 . 19 . 20 and with in the mold wall 19 inserted cudgel 26 ,

The next step is the demolding insert 22 used and this to the sloping mold wall 20 created. Between the demolding insert 22 and the cudgel 26 remains in a substantially rectangular cross-section gap 31 , An upper side of the demolding insert 22 closes flush with a top of the middle mold wall 18 from.

According to 4 in the next step, the reinforcement layer 14 on the middle mold wall 18 and the demolding insert 22 placed. Here comes an end portion of the reinforcing layer 14 above the mold wall 19 on the side of the demolding insert 22 to lie, namely as part of the lateral area 17 ,

Furthermore, a reinforcing layer 12 on the side of the aforementioned end region (which on the demolding insert 22 abuts) and stands upright on the lateral mold wall 19 , Depending on the stiffness of the material is an upper portion of the reinforcing layer 12 over the demolding insert 22 over or temporarily on the reinforcement layer 14 above the demolding insert 22 stored.

According to 5 is now in the gap 31 the pressure plate 23 used and stands on the lateral mold wall 19 on. At the same time lies the pressure plate 23 at the reinforcement layer 12 at. The upper part of the reinforcement layer 12 is at an upper area of the pressure plate 23 pinned, for example with an adhesive. Between Knagge 26 and pressure plate 23 becomes the wedge 29 set, so that the gap 31 is completely filled out.

According to 6 will now be on the reinforcement layer 14 the core 11 hung up. The core is enough 11 until over the demolding insert 22 and to the reinforcing insert 12 approach.

According to 7 eventually becomes the reinforcing layer 13 on the core 11 stored. An end region of the reinforcement layer 13 extends angled upwards, parallel to the reinforcing layer 12 and to the printing plate 23 ,

The individual reinforcement layers 12 to 14 are impregnated with resin, either during the steps described, following each of the steps or following the final step according to 7 ,

core 11 and reinforcing layers resting on both sides 13 . 14 Make one on the middle mold wall 18 flat-lying first bridge section. The middle mold wall 18 thus forms a first support surface for the resting first web section.

The upright and parallel to the pressure plate 23 extending end portions of the reinforcing layers 13 . 14 make up together with the reinforcement layer 12 one on the lateral mold wall 19 standing second web section. The lateral form wall 19 thus forms a second support surface for the second web section standing thereon.

The standing, second web section is located on the pressure plate 23 at. The latter forms a further, namely on the stationary, second web portion adjacent third support surface which faces the lying, first web portion.

By the described form, consisting of the mold walls 18 . 19 . 20 , the demolding insert 22 , the printing plate 23 and the means for holding the printing plate 23 (here: wedge 29 and cudgel 26 ), a rational production is possible. Both the positioning of the parts in the mold, as well as the demolding after production of the web are possible with little effort. This is true even if the on the lateral mold wall 19 standing, second web section (reinforcing layer 12 with end portions of the reinforcing layers 13 . 14 ) relative to the core 11 is not at right angles but obliquely aligned and even its angle in the longitudinal direction (arrow 25 ) changes.

For demolding, first the means for holding the pressure plate 23 solved, here only the wedges 29 , The printing plate 23 can then be pulled out. Subsequently, the web is combined with the demolding insert 22 lifted out of shape. Finally, the demolding insert 22 apart from the bridge, by the way. In this way, web geometries can be made with undercuts in the illustrated form.

According to 8th the wedge is formed in a special way, namely for insertion parallel to the longitudinal direction (arrow 25 ) and thus also parallel to the longitudinal extent of the lateral mold wall 19 , At the same time, the wedge points 29 a thickening, or a lateral stop 32 on, which is a slide past the wedge 29 on the upright thigh 28 prevented.

With the same method, a cross-sectionally C-shaped web can be produced, namely with L-shaped web feet. Likewise, a mixed form is possible, with a T-bar foot and an L-bar foot. Preferably, the standing portion of the L-bar foot extends between the demolding insert 22 and the printing plate 23 , But it is also possible a standing section of the L-bar foot above the demolding insert 22 ,

LIST OF REFERENCE NUMBERS

11

Core (of the bridge)

12

reinforcing plies

13

reinforcing plies

14

reinforcing plies

15

Front side (of the core)

16

Side area

17

Side area

18

Medium form wall

19

Lateral mold walls

20

Slanted mold walls

21

Downward mold walls

22

Entformungseinleger

23

printing plate

24

pressure side

25

arrow

26

cleat

27

baseplate

28

Upright thigh

29

wedge

30

reinforcement

31

gap

32

attack

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011082664 A1 [0002, 0006, 0023]

Claims (10)

A mold for producing a web for a rotor blade, having a first web section resting on a first support surface, having a second web section standing on a second support surface, having an oblique connection surface between first support surface and second support surface, with an insert ( 22 ) in the region of the oblique connecting surface, and having a third support surface having side wall for resting against the second, stationary web portion, namely the first web portion opposite, wherein the side wall in particular in the longitudinal direction (arrow 25 ) of the mold or the rotor blade, characterized by means for supporting the side wall against the second web portion. Mold according to claim 1, characterized in that the means for supporting the side wall are provided only in sections, ie several times along the side wall. Mold according to claim 1 or 2, characterized in that the side wall is formed divided in the longitudinal direction of the mold, namely with successive side wall portions. Mold according to claim 1 or one of the further claims, characterized in that as means for supporting the side wall wedges ( 29 ) and stops are provided, wherein the stops at a distance from the side wall are at least temporarily fixed, and wherein the wedges ( 29 ) are provided for insertion into spaces between the side wall and stops. Mold according to Claim 4, characterized in that the stops are in the form of lugs ( 26 ) or stop angle are formed. Method for producing a web for a rotor blade, using a mold having a first web section resting on a first support surface, having a second web section standing on a second support surface, having an oblique connection surface between first support surface and second support surface, with an insert ( 22 ) in the region of the oblique connection surface, with a third support surface having side wall for abutment with the second, stationary web portion, namely the first web portion opposite, wherein the side wall in particular in the longitudinal direction (arrow 25 ) of the mold or the rotor blade, and wherein means for supporting the side wall are provided against the second web portion. Method according to claim 6, characterized by the following steps: a) the depositor ( 22 ) abuts on the second support surface and on the oblique connection surface, b) at least one fiber layer / reinforcement layer ( 14 ) via the first support surface and the insert ( 22 ), wherein a part of the fiber layer / reinforcing layer ( 14 ) at the depositor ( 22 ) down to the second support surface, c) at least one fiber layer / reinforcing layer ( 12 ) for the standing, second web section is in the area of the insert ( 22 ) to a part of the fiber layer ( 14 b), d) the side wall is placed on the second support surface and thereby to a part of the fiber layer / reinforcing layer ( 12 c) for the standing, second web section, e) the side wall is pressed against the fiber layer / reinforcing layer (FIG. 12 pressed and fixed for the stationary, second web section, f) if necessary, a hitherto non-standing part of the fiber layer / reinforcing layer ( 12 ) erected for the standing, second web section and fixed to the side wall, g) core ( 11 ) and final fiber layers / reinforcing layers ( 13 ) are inserted into the mold. Web for a rotor blade, with at least one web foot, which is formed at least partially substantially T-shaped or C-shaped, prepared by a method according to claims 6 or 7 or in a mold according to one of claims 1 to 5. Rotor blade with at least one web according to claim 8. Wind energy plant with at least one rotor blade according to claim 9.

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