CN102825801B - Manufacturing method of blade girder - Google Patents

Abstract

The embodiment of the present invention provides a method for manufacturing a blade main beam, which relates to the technical field of wind turbine blade manufacturing, and solves the problem of incomplete impregnation of glass fiber fabric or dry fiber phenomenon in the existing manufacturing method. In the embodiment of the present invention, by increasing the height difference between the leading edge side and the trailing edge side of the main beam mold between the sealing inspection stage and the impregnation stage, gravity and vacuum pressure are no longer separate but can act on each other, so that the flow direction of the resin in the fiber is single, which makes it easier to control the resin flow speed so that the resin flow between the fiber bundles is less than or equal to the flow in the fiber bundle, thereby avoiding the phenomenon of incomplete impregnation of glass fiber fabric or dry fiber.

Description

Manufacturing method of blade main beam

technical field

The invention relates to the technical field of manufacturing blades of wind power generators, in particular to a method for manufacturing blade main beams.

Background technique

Blades are one of the important components of wind turbines. They are generally made of composite materials and are structurally divided into three parts: the root, the shell, and the keel. Figure 1 is a cross-sectional view of the blade airfoil. As a key part of the blade casing, the blade main beam 11 needs to bear most of the load of the blade, so the requirements for its strength performance are relatively high.

At present, a prefabricated method is usually used to manufacture the main beam of the blade, and then the formed main beam of the blade is installed in the blade shell as a pre-embedded part. The method adopts a vacuum-assisted resin transfer molding process (VARTM), and its main principle is: while using a vacuum negative pressure to discharge the gas in the glass fiber fabric, the resin can infiltrate the glass fiber fabric at the same time.

Figure 2 shows the equipment used in the VARTM process. Wherein, the main beam mold 21 is installed on the bracket 22, and the front edge side 21a of the main beam mold 21 is provided with a resin pipe 25 for connecting the resin bucket 24, and the rear edge side 21b is provided with a vacuum pipe 23 for connecting a vacuum pump.

The method of using this equipment to make the main beam of the blade includes: material preparation stage, sealing inspection stage, dipping stage and curing demoulding stage, and the specific description of each stage is as follows:

Material preparation stage: set the main beam mold 21 in a horizontal state, so that the material placed on the main beam mold 21 will not fall from the main beam mold 21; apply a release agent to the upper surface of the main beam mold 21, and cut A good glass fiber fabric 27 is laid in the main beam mold 21; then the release film and the guide net 26 are laid; finally the resin pipe 25 and the vacuum tube 23 are discharged, and various main components such as the above glass fiber fabric 27 are packed with a vacuum bag 28. Auxiliary materials such as material, mold release film and diversion net 26, resin tube 25 and vacuum tube 23 are integrally sealed on the main beam mold 21.

Check the tightness stage: After the above-mentioned sealing, turn on the vacuum pump connected to the vacuum tube 23 to extract the air from the fiberglass fabric 27, and check various main materials such as the main beam mold 21, the fiberglass fabric 27, the resin tube 25 and the vacuum tube 23 overall tightness.

Glue dipping stage: After confirming that the above-mentioned overall sealing is good, open the valve 25A of the resin pipe 25 to let the resin enter the main beam mold 21 from the resin barrel 24 to infiltrate the glass fiber fabric 27 .

Curing and demoulding stage: after the impregnation of the glass fiber fabric 27 is completed, the heating system of the main beam mold 21 is turned on to cure the resin.

When the above method is adopted, the main beam mold 21 is set to the above-mentioned horizontal state, so that the resin with fluidity will be soaked from the surface layer of the glass fiber fabric 27 at a relatively fast speed under the action of the flow guide net 26, and at a relatively fast speed. The middle layer of multi-layer fiberglass fabric 27 is infiltrated at a slow speed.

The flow of resin in the glass fiber fabric 27 is divided into flow between fiber bundles and flow inside fiber bundles. When dipping in the horizontal state of the main beam mold 21, the gravity of the resin acts on the gravity direction perpendicular to the horizontal plane, while the vacuum pressure acts on the horizontal direction from the resin pipe to the vacuum pipe, so the gravity and the vacuum pressure are separated. Separation causes the resin to flow in multiple directions due to multi-directional forces, and due to the different permeability of the fibers in each direction, the flow speed of the resin in each direction is different, so that the flow between the fiber bundles in some directions is smaller than the flow within the fiber bundle. The inter-fiber flow in some directions is larger than the intra-fiber flow. And when the flow velocity between the fiber bundles is greater than the flow inside the fiber bundles, incomplete dipping or dry fibers will occur, and this situation will cause the defect that the strength of the main beam of the blade is not enough.

Therefore, when the blade main beam mold 21 is in a horizontal state, the stress and strength of the blade main beam due to incomplete dipping or dry fiber phenomenon in the glass fiber fabric may not meet the manufacturing requirements, so that the blade main beam cannot Used, only scrapped.

Contents of the invention

The embodiment of the present invention provides a method for manufacturing the main beam of the blade, which solves the problem that the existing manufacturing method of the main beam of the blade is prone to incomplete impregnation of glass fiber fabrics or dry fibers, so that the stress and strength of the blade cannot meet the manufacturing requirements.

In order to achieve the above object, embodiments of the present invention adopt the following methods:

A method for manufacturing a main beam of a blade, comprising: a material preparation stage, a sealing performance inspection stage, a glue dipping stage, and a curing and demoulding stage, wherein, between the sealing performance inspection stage and the glue dipping stage, it also includes: enlarging the main beam The difference in height between the leading edge side and the trailing edge side of the mold.

Preferably, the resin pipe is located below the vacuum pipe, so that the resin flows from a lower place to a higher place during the impregnation stage.

Preferably, the height difference between the front edge side and the rear edge side of the main beam mold is equal to the distance between the front edge side and the rear edge side.

Preferably, a hinge is provided at the bottom of the bracket supporting the main beam mold; the method for increasing the height difference between the front edge side and the rear edge side of the main beam mold specifically includes: making the main beam mold along Rotate about the hinge in a direction towards the leading edge side or in a direction towards the trailing edge side.

Preferably, a telescopic mechanism is provided on the support, and the telescopic mechanism is used to drive the support to rotate around the hinge.

Preferably, a suspension point is provided on the support, and the suspension point is suspended by an external traction mechanism to drive the support to rotate around the hinge.

In the manufacturing method of the main beam of the blade provided by the embodiment of the present invention, the process of increasing the height difference between the leading edge side and the trailing edge side of the main beam mold is carried out between the sealing inspection stage and the dipping stage, so that the gravity It is no longer separated from the vacuum pressure but can interact with each other, so that the flow direction of the resin in the fiber is single, which makes it easier to control the flow rate of the resin, so that the flow between the fiber bundles is less than or equal to the flow within the fiber bundle, thus avoiding the occurrence of glass The phenomenon that the fiber fabric is not completely dipped or the fiber is dry.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the sectional view of existing blade airfoil;

Fig. 2 is the structural representation of the equipment used in existing VARTM process;

Fig. 3a is a schematic diagram of placing the main beam mold in a horizontal state in the manufacturing method of the blade main beam provided by the embodiment of the present invention;

Fig. 3b is a schematic diagram of the height difference between the leading edge side and the trailing edge side of the main beam mold in the manufacturing method of the blade main beam provided by the embodiment of the present invention equal to the distance between the leading edge side and the trailing edge side;

Fig. 4 is a kind of structural schematic diagram of the bracket supporting the main beam mold provided by the embodiment of the present invention;

Fig. 5 is another schematic structural view of the bracket supporting the main beam mold provided by the embodiment of the present invention;

Fig. 6 is a flowchart of a method for manufacturing a blade main beam provided by an embodiment of the present invention.

Detailed ways

The manufacturing method of the blade main beam provided by the embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a method for manufacturing a blade main beam, as shown in Fig. 3a, Fig. 3b and Fig. 6, including the following steps.

101: Material preparation stage; 102: Sealing inspection stage; 104: Glue dipping stage and 105: Curing and demoulding stage, wherein, between 102: Checking tightness stage and 104: Glue dipping stage also includes step 103: Increasing The difference in height between the front edge side 31a and the rear edge side 31b of the main beam mold 31 .

Each step in the above method is described in detail below.

101. Material preparation stage: set the main beam mold 31 in a horizontal state, so that the material placed on the main beam mold 31 will not fall off from the main beam mold 31; apply a release agent to the upper surface of the main beam mold 31, and put The cut glass fiber fabric 32 is placed in the main beam mold 31; then the release film and the diversion net 33 are laid; finally the resin pipe 34 and the vacuum pipe 35 are discharged, and a vacuum bag is laid on it and sealed with an adhesive tape. Various materials such as the main beam mold 31, the glass fiber fabric 32, the mold release film and the diversion net 33, the resin pipe 34 and the vacuum pipe 35 are integrally sealed with a vacuum bag. In other words, according to the structural design of the main beam, the glass fiber fabric 32 and other perfusion auxiliary materials are laid horizontally in the main beam mold 31 layer by layer, thereby completing the preparation and sealing of the materials required for making the main beam mold.

Wherein, the above-mentioned setting of the main beam mold 31 in a horizontal state can adopt the following methods: ① By adjusting the bracket 36 used to support the main beam mold 31, the bracket 36 is kept horizontal, so that the bracket 36 is set to make it horizontal, so that The main beam mold 31 supported by it is also kept horizontal, thereby setting the main beam mold 31 to be in a horizontal state; ② use an instrument such as a level that can measure the height difference between points of the measured object, and measure the measured point on the main beam mold 31 The height difference between them, combined with the above difference and the radian of the main beam mold 31 itself, calculates and judges whether the main beam mold 31 is horizontal, thereby adjusting and setting the main beam mold 31 in a horizontal state. 102. Check the tightness stage: turn on the vacuum pump connected to the vacuum tube 35, extract the air from the fiberglass fabric 32, check the main beam mold 31, the glass fiber fabric 32, the release film and the guide net 33 and other materials and resins The airtightness of the tube 34 and the vacuum tube 35 as a whole. In the sealing inspection stage, after the vacuum pump is turned on to evacuate, the above-mentioned various materials and the main beam mold 31 are tightly attached to form a whole under the vacuum pressure.

103. Increase the height difference between the front edge side 31a and the rear edge side 31b of the main beam mold 31. By adopting methods such as tilting and flipping the main beam mold 31, the distance difference between the horizontal plane where the front edge side 31a of the main beam mold 31 is located and the horizontal plane where the rear edge side 31b is located increases, thereby realizing the front edge side of the main beam mold 31. The increase in height difference between 31a and trailing edge side 31b.

104. Glue dipping stage: After confirming that the above-mentioned overall sealing is good, open the valve of the resin pipe 34 to let the resin enter the main beam mold 31 from the resin barrel to soak the glass fiber fabric 32 .

105. Curing and demoulding stage: after the infiltration of the glass fiber fabric 32 is completed, the heating system of the main beam mold 31 is turned on to cure the resin.

In the manufacturing method of the main spar of the blade provided by the embodiment of the present invention, the process of increasing the height difference between the leading edge side 31a and the trailing edge side 31b of the main spar mold 31 is performed between the sealing inspection stage and the dipping stage , so that gravity and vacuum pressure are no longer separated but can act on each other, so that the flow direction of the resin in the fiber is single, which makes it easier to control the flow rate of the resin so that the flow between the fiber bundles is less than or equal to the flow within the fiber bundle, thereby avoiding The phenomenon that the glass fiber fabric 32 is not completely dipped in glue or dry fibers occurs.

Wherein, FIG. 3 b shows a specific way of resin flow, that is, when the height difference between the front edge side 31 a and the rear edge side 31 b of the main beam mold 31 is increased, the resin pipe 34 is positioned below the vacuum pipe 35 , In order to make the resin flow from low to high during the dipping stage.

As shown in Figure 3b, by setting the bracket 36 as mentioned above, it can be tilted to drive the main beam mold 31 to tilt, and the front edge side 31a where the resin pipe 34 of the main beam mold 31 is located is close to the ground or the base, so that Resin flows from low to high.

In the above-mentioned embodiment, by making the resin flow from a low place to a high place, not only the gravity of the resin itself and the vacuum pressure can interact with each other, but also because the vacuum pressure needs to make the resin flow under the state of overcoming the gravity, so the resin is The flow in the glass fiber fabric 32 becomes slow, so that the resin can more fully infiltrate the glass fiber fabric 32 .

Of course, the way of resin flow is not limited to flow from low to high as shown in Figure 3b, and other flow ways can also be used, as long as the height difference between the front edge side and the rear edge side of the main beam mold is increased to Make the resin gravity and vacuum pressure interact with each other, so that the flow direction of the resin in the fiber is single, and it is easier to control the flow rate of the resin so that the flow between the fiber bundles is smaller than the flow inside the fiber bundle, thereby avoiding incomplete impregnation of glass fiber fabrics or dry fiber phenomenon.

In addition, Fig. 3b further shows a specific placement method of the equipment used in the manufacture of the main beam of the blade, that is: the height difference between the leading edge side 31a and the trailing edge side 31b of the main beam mold 31 is equal to that of the leading edge side 31a The distance L from the trailing edge side 31b.

In Fig. 3b, the height difference between the leading edge side 31a and the trailing edge side 31b is equal to the distance L between the leading edge side 31a and the trailing edge side 31b, that is, the height difference reaches a maximum at this time. In other words, compared to the previous horizontal state where the main beam mold 31 was placed horizontally, the main beam mold 31 is now in a vertically inclined state. The resin tube 34 is located at a low position and the vacuum tube 35 is located at a high position. Therefore, when the resin flows out of the resin tube 34, it will flow from a low position to a high position through vacuum pressure, that is, flow from bottom to top in the figure. During the flow process, since the resin is also subjected to the gravity opposite to the vacuum pressure, it is necessary to overcome the gravity through the vacuum pressure, so that the resin can flow from bottom to top, so that the flow speed becomes slow at this time. Therefore, at this time, the gravity and vacuum pressure of the resin are concentrated in the up and down direction in the figure, that is, the direction perpendicular to the horizontal plane. Gravity and vacuum pressure are no longer separated but interact with each other, so that the flow direction of the resin in the fiber is from bottom to top Therefore, it is possible to fully infiltrate the glass fiber fabric 32 with the resin, avoiding incomplete impregnation of the glass fiber fabric or dry fibers.

In the above-mentioned embodiment, the entire gravitational force of the resin and the vacuum pressure can be made to act on each other, that is, the gravitational force and the vacuum pressure can be made to act in the same direction perpendicular to the horizontal plane. Therefore, the flow direction of the resin in the fibers is a single flow from bottom to top (described above), which makes it easier to control the flow rate of the resin so that the flow between the fiber bundles is smaller than the flow in the fiber bundles, thus avoiding the immersion of the glass fiber fabric 32. Incomplete glue or dry fiber phenomenon. Of course, the height difference between the front edge side and the rear edge side of the main beam mold is not limited to the height difference shown in Figure 3b (that is, the main beam mold is in a vertical state), and the height difference can also be smaller than the front edge side and the rear edge side The distance between them, that is, the main beam mold is in an inclined state. As mentioned above, as long as the height difference between the front edge side and the rear edge side of the main beam mold is increased to make the resin gravity and vacuum pressure interact with each other, it can be made The flow direction of the resin in the fiber is single, and it is easier to control the flow rate of the resin so that the flow between the fiber bundles is less than or equal to the flow within the fiber bundles, thereby avoiding the phenomenon of incomplete impregnation of glass fiber fabrics or dry fibers.

In the above embodiment, Figs. 4 to 5 show the specific structure of the bracket provided by the embodiment of the present invention, that is: a hinge is provided at the bottom of the bracket supporting the main beam mold; the front edge of the enlarged main beam mold The height difference between the side and the trailing edge side specifically comprises: rotating the main spar mold about the hinge in a direction towards the leading edge side or in a direction towards the trailing edge side.

Since the height of the resin tube needs to be lower than that of the vacuum tube, the resin tube and the vacuum tube can be arranged so that the resin tube can be on the leading edge side, or the resin tube can be on the trailing edge side. Correspondingly, if the resin tube is on the leading edge side, the vacuum tube is on the trailing edge side. In order to make the resin tube lower than the vacuum tube, the front edge side, that is, the direction where the resin tube is located, is tilted or rotated; if the resin tube is on the trailing edge side, the vacuum tube On the leading edge side, in order to make the resin pipe lower than the vacuum pipe, it is inclined or rotated toward the trailing edge side, that is, the direction where the resin pipe is located.

Of course, the method of increasing the height difference between the front edge side and the rear edge side of the main beam mold is not limited to the hinge type shown in Fig. 4 and Fig. Other structures known to those skilled in the art such as the height difference.

Wherein, Fig. 4 has shown a kind of specific structure of the bracket supporting the main beam mould, that is: a telescopic mechanism 43 is arranged on the bracket 42, and the telescopic mechanism 43 is used to drive the bracket 42 around the hinge 44 rotate.

In addition, Fig. 5 shows another specific structure of the bracket supporting the main beam mould, that is: the bracket 52 is provided with a lifting point X and a lifting point Y, and the lifting point X and the lifting point Y can be pulled by the outside The mechanism is suspended to drive the bracket 52 to rotate around the hinge 53 .

The bracket shown in Fig. 4 and Fig. 5 can be rotated around the hinge through a telescoping mechanism or a traction mechanism, so as to increase the height difference between the front edge side and the rear edge side of the main beam mould. Wherein, the hydraulic turning system 43 shown in FIG. 4 can be controlled by a control panel arranged at the end of the bracket 42 to start, stop, emergency stop, reverse direction. Specifically, a bottom angle of the support 42 is installed on the ground or the base through a hinge 44, so that the support 42 can rotate around the hinge 44; in addition, on the support 42, the hydraulic telescopic rods of the hydraulic turning system 43 are connected at regular intervals. 43a, through the expansion and contraction of the hydraulic telescopic rod 43a, the bracket 42 can be driven to rotate around the hinge 44, so that the bracket 42 rotates together with the main beam mold 41, increasing the distance between the front edge side 41a and the rear edge side 41b of the main beam mold 41 altitude difference. In addition, two suspension points X, Y are set on the support 52 shown in Fig. 5, and the above-mentioned suspension points X, Y are pulled by using an external traction mechanism such as a crown block, and the auxiliary support 52 rotates around the hinge 53, so that the support 52 carries As the main beam mold 51 rotates together, the height difference between the leading edge side 51a and the trailing edge side 51b of the main beam mold 51 is increased.

Of course, the structure of the main beam mold support is not limited to the structure when the above-mentioned telescopic mechanism and traction mechanism are used, and it can be set in combination with the driving method adopted (for example, driving the support by a self-movable mobile mechanism, etc.) Other structures known to personnel.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (4)

1. a preparation method for blade girder, comprising: material preparation phase, inspection sealing stage, impregnation stage and cure and demold stage, it is characterized in that, the bottom of the support supporting described girder mould is provided with hinge;

Also comprise between inspection sealing stage and impregnation stage: make described girder mould along the direction towards front edge side or rotate around described hinge along the direction towards trailing edge side, to increase the difference in height between girder mould front edge side and trailing edge side,

Make pitch tube be positioned at the below of vacuum tube, to make in the described impregnation stage, resin to hoist flowing from lower.

2. method according to claim 1, is characterized in that, the difference in height between described girder mould front edge side and trailing edge side equals the distance between described front edge side and described trailing edge side.

3. method according to claim 1, is characterized in that,

Be provided with telescoping mechanism on the bracket, described telescoping mechanism rotates around described hinge for driving described support.

4. method according to claim 1, is characterized in that,

Be provided with suspension centre on the bracket, described suspension centre hangs to drive described support to rotate around described hinge by outside haulage gear.