A rigid wind turbine blade mold structure with quick-change airfoil

Abstract

The application discloses a rigid wind power blade mold structure with a wing type capable of being quickly replaced, which comprises a supporting structure for supporting an upper mold or a lower mold and a clamping structure for clamping the upper mold and the lower mold together, and the mold shell on the supporting mechanism is the lower mold; after the female mold is demolded, the bottom supporting adjusting device supports the lower mold, and the lower mold is lifted away by a travelling crane; the mold shell on the supporting mechanism is the upper mold; after the female mold is demolded, the upper mold needs to be turned over to the upper side of the lower mold by a turning beam, the upper mold flange edge and the lower mold flange edge are limited and abut by the clamping mechanism, the upper mold and the lower mold are locked, the mold structure improves the bending stiffness, thereby greatly improving the deformation resistance of the shell, simplifying the supporting structure, shortening the production and installation period, reducing the structural space size, reducing the overall weight of the mechanism, facilitating transportation, reducing energy consumption and pollution, improving the installation efficiency, and saving the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind turbine blade molds, in particular to a rigid wind power blade mold structure capable of quickly replacing airfoils. BACKGROUND

[0002] Wind energy, as a clean and renewable energy, is increasingly valued by countries around the world. Its potential is huge, global wind energy is about 2.74×109MW, of which the available wind energy is 2×107MW, which is 10 times larger than the total amount of water energy that can be developed and utilized on earth. Wind has been used by people for a long time, mainly through windmills to pump water, grind flour, etc. Now, people are interested in how to use wind to generate electricity. The principle of wind power generation is to use wind to drive windmill blades to rotate, and then use a speed increaser to increase the speed of rotation to promote the generator to generate electricity. According to the current wind power generation technology, about three meters per second of wind speed can start power generation. Wind power generation is forming a hot trend in the world because wind power generation has no fuel problem and does not produce radiation or air pollution.

[0003] With the vigorous development of clean energy by the country, the wind power industry has also developed rapidly, and the megawatt level of wind power blades is getting larger and larger. The length of the wind power blade has changed from the original two or three meters to more than one hundred meters, which makes the cost of making the blade mold higher and the operation process more complicated.

[0004] The current structure of the wind power blade mold shell is typically a high polymer composite material, such as fiber-reinforced plastic, which may include core materials such as artificial foam, wood, metal honeycomb material, etc. Typical molding processes include: hand lay-up molding, hand lay-up bag pressing molding, vacuum infusion molding, autoclave molding, resin transfer molding, prepreg laying molding, etc. The typical mold shell structure usually has a relatively uniform thickness, and its main function is to provide the required shape size, process conditions (such as vacuum, temperature, surface roughness), etc. for blade manufacturing.

[0005] Because the mold shell is thin and has low rigidity, it cannot guarantee the geometric shape of the blade during production by itself, so the mold shell is often supported by a complex steel frame. In the typical process of blade production, the blade is formed in the mold opening state, and the steel frame is the source of the rigidity of the entire mold system during the process of mold closing. The current mold shell has the characteristics of low rigidity, and the rigidity of the steel frame needs to be relatively high, so the design is complex, the weight is heavy, and the production cycle is long. In the prior art, in order to connect the mold shell and the steel frame, metal pipes along the length direction of the mold are arranged on the mold steel frame, then the metal pipes are wrapped with glass fiber cloth soaked with resin and hand-pasted on the back of the mold shell, and then waiting for curing. The metal pipes are arranged in parallel in the width direction of the mold, and the metal plates are used to make local connection with the mold shell, which has more degrees of freedom, so that the deformation of the mold shell in the width direction cannot be fully constrained, resulting in large profile change in the blade production process and unstable quality.

[0006] In order to improve the rigidity of the mold shell, different types of reinforcing ribs are designed and installed on the back of the mold shell, or the thickness of the shell is increased, and different types of core materials such as PET, PVC, balsa wood and aluminum honeycomb are used to improve the rigidity of the mold shell. The above-mentioned materials have high cost, heavy weight, and pollution to the environment during molding, and long-term contact with composite materials will cause certain harm to the health of employees. SUMMARY

[0007] The purpose of the present application is to solve the problems of the prior art and provide a rigid wind power blade mold structure with a wing type that can be quickly replaced. The mold structure improves the bending stiffness, thereby greatly improving the deformation resistance of the shell to simplify the support structure, shorten the production and installation period, reduce the structure space size, reduce the overall weight of the mechanism, facilitate transportation, reduce energy consumption and pollution, improve installation efficiency, and save cost.

[0008] Technical scheme: In order to achieve the above purpose, the rigid wind power blade mold structure with a wing type that can be quickly replaced comprises a support structure for supporting an upper mold or a lower mold and a clamping mechanism for clamping the upper mold and the lower mold together.

[0009] The support structure comprises a sectional steel structure frame, a bottom support adjusting device, a segmented support, a support rod, a guide rail, a connecting device profile steel and a sliding block. The sectional steel structure frame is sleeved on the turnover arm, the bottom support adjusting device is vertically installed on the sectional steel structure frame, one end of the connecting device profile steel is vertically fixed on the bottom of the sectional steel structure frame, the other end of the connecting device profile steel is connected with the telescopic rod, the guide rail is installed on the bottom of the sectional steel structure frame, one end of the support rod is hinged on the telescopic rod, and the other end of the support rod moves horizontally and linearly on the guide rail through the sliding block.

[0010] When the support height of the support mechanism needs to be adjusted after the mold shell profile is determined, the telescopic rod is pulled out from the connecting device section steel to a limited height, at this time the slider is driven by the support rod and slides on the guide rail to a limited position, then the pin is inserted into the pin hole to limit the position of the slider on the guide rail, and finally a triangle is formed by the support rod, the section steel frame and the connecting device section steel, so as to ensure the stability and reliability of the support link supporting the mold shell.

[0011] The clamping mechanism comprises an electromagnet, a metal block and a locking device, the electromagnet or the metal block is respectively installed in the flange edge of the upper die or the lower die, the locking device is sleeved at the connection between the upper die flange edge and the lower die flange edge, and the locking device is controlled by the energization and de-energization of the electromagnet, which is not repeated here.

[0012] If the mold shell on the support mechanism is a lower die, after the mold is demolded, the bottom support adjusting device supports the lower die, and the lower die can be lifted away by the crane, if the mold shell on the support mechanism is an upper die, after the mold is demolded, the upper die needs to be turned over to the upper side of the lower die by the turning beam, and the flange edges of the upper die and the lower die are limited and abutted by the clamping mechanism to lock the upper die and the lower die.

[0013] As a further preferred embodiment of the present application, the connecting device section steel and the support rod are respectively symmetrically arranged on the section steel frame, the support strength of the connecting device section steel relative to the section steel frame is reinforced by the horizontal movement of the two support rods on the guide rail, and the upper die or the lower die is supported by the height-adjustable support link in cooperation with the support of the plurality of sectional supports, so as to ensure the stability of the position of the upper die or the lower die above the sectional supports and the connecting device section steel.

[0014] As a further preferred embodiment of the present application, the piston rod on the bottom support adjusting device is detachably connected with the sectional support, when different airfoil-shaped rigid wind power blades need to be replaced, the sectional support is only needed to be disassembled, the size of the sectional support matched with the shape of the blade and the telescopic height of the telescopic rod on the connecting device section steel are adjusted, so that the mold shell of different airfoils can be adapted.

[0015] As a further preferred embodiment of the present application, the sectional support is shaped to match the shape of the outer surface of the mold shell above it, and is used to support wind power blades of different sizes.

[0016] As a further preferred embodiment of the present application, the number of the bottom support adjusting devices is at least two, so as to ensure the stability and reliability of the support.

[0017] As a further preferred embodiment of the present application, the guide rails are fixed to the bottom of the cross-section steel structure frame by screw connection, and when it is necessary to quickly replace the rigid blade of an uncommon size, the extension height of the telescopic rods on the connecting device section steel is adjusted by adjusting the positions of the two guide rails.

[0018] As a further preferred embodiment of the present application, the guide rails are provided with a bolt hole for limiting the sliding block, and when it is necessary to horizontally move the sliding block to a limited position, the sliding block is slid on the guide rail to the limit position after the bolt is inserted into the bolt hole in advance, thereby limiting the limit position of the sliding block on the guide rail.

[0019] As a further preferred embodiment of the present application, the support rod and the sliding block are connected by hinging.

[0020] As a further preferred embodiment of the present application, the bottom support adjusting device and the locking device are respectively powered by a gas pump system or a hydraulic system.

[0021] As a further preferred embodiment of the present application, the gas pump system or the hydraulic system is connected with a PLC circuit.

[0022] As a further preferred embodiment of the present application, the ends of the two adjacent telescopic rods are respectively connected with the support connecting rod perpendicularly, which ensures the stability and reliability of the support for the mold shell, and at the same time, different mold shells can be adapted according to different wing-shaped mold shell curves.

[0023] As a further preferred embodiment of the present application, the inner surfaces of the upper mold flange edge and the lower mold flange edge are provided with guide concave-convex blocks for aligning the relative positions of the upper and lower molds.

[0024] Beneficial effects: Compared with the prior art, the rigid wind power blade mold structure with quick replaceable wing type has the following advantages:

[0025] (1) By canceling the use of a complex steel structure, the weight of the mold is reduced as a whole, and the cost is saved;

[0026] (2) The enhanced mold glass steel shell structure has a bending stiffness several orders of magnitude higher than that of a common mold shell, thereby greatly improving the deformation resistance of the shell and providing necessary conditions for a simpler support structure;

[0027] (3) The bending strength of the mold shell obtained by the mold is higher than that of the mold shell in the prior art, thereby greatly improving the deformation resistance of the shell to simplify the support structure, shortening the production and installation period, reducing the structure space size, reducing the overall weight of the mechanism, facilitating transportation, reducing energy consumption and pollution, improving installation efficiency, and saving cost;

[0028] (4) when the rigid wind turbine blade of different airfoil needs to be replaced, only the segmented support is disassembled, the size of the segmented support matched with the shape of the blade and the extension height of the extension rod on the relative section rigid structure frame of the connecting device section steel are adjusted, and the waste and pollution are reduced;

[0029] (5) the mold shell is quickly replaced through the overall structure, so that the overall mold time cost is reduced;

[0030] (6) the preparation method is simple, easy to operate, convenient to construct, strong in use flexibility, good in adaptability and easy to popularize and apply. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic view of the mold shell installed on the supporting mechanism;

[0032] Figure 2 It is a working state schematic view of the turnover mechanism;

[0033] Figure 3 It is a structure schematic view of the present application;

[0034] Figure 4 It is a front view of the present application;

[0035] Figure 5 It is a local enlarged view of the guide rail;

[0036] Figure 6 It is a schematic view of the internal structure of the sliding block;

[0037] Figure 7 It is a structure schematic view of the locking device;

[0038] Figure 8 It is a working state schematic view of the present application. DETAILED DESCRIPTION

[0039] The present application will be further illustrated below in combination with the drawings.

[0040] As shown in the drawings, the rigid wind turbine blade mold structure with quick replacement airfoil provided by the present application comprises a turnover arm 1, a section steel structure frame 20, a bottom support adjusting device 2, a segmented support 3, a supporting rod 4, a guide rail 5, a connecting device section steel 6, a sliding block 7, a bolt hole 8, an electromagnet 9, a metal block 10, a locking device 11, a circular tube 12, the electromagnet 9, the metal block 10 and the locking device 11.

[0041] The following procedures are needed to obtain the lower mold through the device: making the mold shell 30 on the master mold, analyzing the distribution interval of the bottom support adjusting device 2, uniformly arranging the circular tubes 12 on the back of the hand lay-up mold shell 30, coating the back rigid reinforcing layer material, demolding the master mold;

[0042] The following procedures are required to obtain the upper mold by the device: making the mold shell 30 on the female mold, analyzing the distribution interval of the bottom support adjusting device 2, uniformly arranging the circular pipes 12 on the back of the hand lay-up mold shell 30, coating the back rigid reinforcing layer material, demolding the female mold, flipping the sectional steel structure frame to close the mold, connecting the flange edges, and performing laser detection and profile adjustment according to the 3D model of the mold;

[0043] The female mold is the original mold, and both the upper mold and the lower mold are made on the original mold, as shown in Figure 1 If the lower mold needs to be made, the female mold on the inner surface of the lower mold can be demolded after the lower mold is completed. If the upper mold needs to be made, the female mold on the inner surface of the upper mold can be demolded after the upper mold is completed, and then the upper mold can be flipped to the upper side of the lower mold by the flipping mechanism, as shown in Figure 2 .

[0044] When the shell structure needs to be replaced, the mold shell 30 can be removed from the corresponding segmented support 3, and the bottom support adjusting device 2 can be reused for different blade type mold structures. After the mold shell is replaced, the height of the bottom support adjusting device 2 can be adjusted according to the surface curvature of the mold shell 30 for use, which greatly reduces waste and pollution, saves costs, and provides a better solution for sustainable economic and environmental development.

[0045] Comparison of experimental data

[0046] Taking an 80-meter mold available on the market as an example, the parameters of the mold shell are compared, as follows:

[0047] From the comparison, it can be seen that the replaceable shell structure obtained by the method improves the bending stiffness, greatly improves the deformation resistance of the shell, simplifies the support structure, shortens the production and installation period, reduces the structure space size, reduces the overall weight of the mechanism, facilitates transportation, reduces energy consumption and pollution, improves installation efficiency, and saves costs Embodiment

[0048] Step one, make the mold shell 30 on the outer surface of the female mold as the lower mold, and sequentially cure the profile layer, heating layer, and reinforcing layer on the back of the mold shell 30, then embed square pipes on both sides of the flange edge of the mold shell 30, and cure for 7h at a temperature of 40℃;

[0049] Step two, after the mold pre-embedded square pipe curing process is completed, analyze the stress of each component of the mold shell 30 by FEA mechanical finite element analysis software;

[0050] Step three, after arranging the circular tubes 12 evenly on the back of the mold shell 30, use epoxy resin and LTM800 / 225 glass fiber cloth to hand lay 2 layers of material, leaving a window for connecting the circular tubes 12 and the support structure, and after the hand lay process is completed, cure at room temperature for 12 hours;

[0051] Step four, after the hand lay process is completed, coat the back of the mold shell 30 with a back rigid reinforcing layer material;

[0052] The steps for making the back rigid reinforcing layer are as follows:

[0053] (1) Add 10 parts by mass of perlite, bentonite, ceramic particles, basalt or silicon oxide and 5 parts by mass of fiber filaments, short steel wires or quartz sand to a planetary stirring device and mix for 5 minutes, then stir until uniform, then add 30 parts by mass of epoxy resin to the stirrer and stir for 10 minutes, until the viscosity is 10,000 cp, to obtain the back rigid reinforcing layer material;

[0054] (2) Use an extrusion device or manually extrude the rigid reinforcing layer material to coat the back of the mold shell uniformly with a thickness of 2 cm, except for the reserved connection window;

[0055] (3) After coating the back of the mold shell except for the reserved connection window, cure at room temperature for 6-10 hours to obtain the back rigid reinforcing layer.

[0056] Step five, after the back rigid reinforcing layer is formed, demold the master mold;

[0057] The bottom support adjusting device 2 adjusts according to the curvature fluctuation of the profile to match the support of different profiles. The curvature fluctuation of the profile is modeled in Pro / E software, the curvature change of the profile is obtained by combining ANASYS analysis software, and the profile support design is adjusted;

[0058] The bottom support adjusting device 2 is a telescopic piston rod powered by an air pump as a support element. When the mold shell needs to be supported, first determine the position of the bottom support adjusting device according to the results calculated in step two, then determine the profile curvature fluctuation according to the surface condition of the upper mold, model the profile curvature fluctuation in Pro / E software, obtain the curvature change of the profile by combining ANASYS analysis software, and finally determine the extension length of the piston rod according to the curvature change. After the sliding block 7 slides to the limit position on the guide rail 5, the sliding block 7 is slid to the limit position on the guide rail 5 by inserting the pin into the pin hole 8 in advance, thereby limiting the limit position of the sliding block 7 on the guide rail 5, adjusting the height of the telescopic rod 61 on the two connecting device profile steels 6, and matching the mold shell 30 profile by the two connecting device profile steels 6 and the plurality of sectional supports 3, to achieve the support of the mold shell 30;

[0059] Finally, the mold is removed from the support structure by a crane. Embodiment

[0060] Step one, make a mold shell 30 as the lower mold on the outer surface of the mold, and sequentially cure the mold shell 30 back of the profile layer, heating layer and reinforcing layer, then embed the square tube on both sides of the flange edge of the mold shell 30, and cure for 9h at a temperature of 50℃;

[0061] Step two, after the mold pre-embedded square tube curing process is completed, analyze the stress of each component of the mold shell 30 by FEA mechanical finite element analysis software;

[0062] Step three, after arranging the circular tube 12 evenly on the back of the mold shell 30, use epoxy resin and LTM800 / 225 glass fiber cloth to hand lay 2 layers of the reserved circular tube 12 and the support structure connection window, and after the hand lay process is completed, cure for 12h at room temperature

[0063] Step four, after the hand lay process is completed, coat the back rigid reinforcing layer material on the back of the mold shell 30;

[0064] The preparation steps of the back rigid reinforcing layer are as follows:

[0065] (1) Add 30 parts by mass of perlite, bentonite, ceramic particles, basalt or silicon oxide and 10 parts by mass of fiber, short steel wire or quartz sand to the planetary stirring equipment, mix for 10min and stir uniformly, then add 70 parts by mass of epoxy resin to the stirrer and stir for 20min, When the viscosity is 20000cp, the back rigid reinforcing layer material is obtained;

[0066] (2) The rigid reinforcing layer material is uniformly coated on the back of the mold shell except the reserved connection window by extrusion equipment or manual extrusion method with a thickness of 20cm;

[0067] (3) After the back of the mold shell except the reserved connection window is coated, cure for 10h at room temperature to obtain the back rigid reinforcing layer.

[0068] Step five, after the back rigid reinforcing layer is formed, demold the mold;

[0069] The bottom support adjusting device 2 adjusts according to the curvature fluctuation of the profile for supporting different profiles. The profile curvature fluctuation is modeled in the Pro / E software, and the ANASYS analysis software is used to obtain the curvature change of the profile, so as to design and adjust the profile support;

[0070] The bottom support adjustment device 2 is a retractable piston rod powered by an air pump as a support element. When the mold shell needs to be supported, the position of the bottom support adjustment device is first determined according to the result calculated in step 2, and then the curvature fluctuation of the mold surface is determined according to the surface curvature of the upper mold and modeled in Pro / E software. The curvature change of the mold surface is obtained by combining with ANASYS analysis software, and finally the extension length of the piston rod is determined according to the curvature change. After the slider 7 slides to the limited position on the guide rail 5, the pin is inserted into the pin hole 8 in advance, and then the slider 7 is slid to the limit position on the guide rail 5, thereby limiting the limit position of the slider 7 sliding on the guide rail 5, thereby adjusting the extension height of the telescopic rod 61 on the two connecting device steel sections 6, and the two connecting device steel sections 6 and multiple segmented brackets 3 are adapted to the mold shell 30 surface to achieve support for the mold shell 30;

[0071] Finally, the master mold can be moved away from the support structure by crane. Example

[0072] Step 1: Make a mold shell 30 as the upper mold on the outer surface of the mother mold, and cure the molding layer, heating layer and reinforcement layer on the back of the mold shell 30 in sequence. Then, embed square tubes on the flange edges on both sides of the mold shell 30 and cure them at 45°C for 8 hours.

[0073] Step 2: After the curing process of the mold embedded square tube is completed, the stress conditions of each component of the mold shell 30 are analyzed using FEA mechanical finite element analysis software;

[0074] Step 3: After evenly arranging the round tubes 12 on the back of the mold shell 30, use epoxy resin and LTM800 / 225 fiberglass cloth to lay up two layers by hand, leaving a window for connecting the round tubes 12 and the support structure. After the hand lay-up process is completed, cure at room temperature for 12 hours;

[0075] Step 4: After the hand lay-up process is completed, a back rigid reinforcement layer material is applied to the back of the mold shell 30;

[0076] The steps for making the back rigid reinforcement layer are as follows:

[0077] (1) Add 20 parts by mass of perlite, bentonite, ceramic particles, basalt or silicon oxide and 8 parts by mass of fiber, short steel wire or quartz sand into a planetary mixing device and mix them for 7 minutes and then stir them evenly. Then add 50 parts by mass of epoxy resin into the mixer and stir for 16 minutes. When the viscosity is 15000cp, the back rigid reinforcement layer material is obtained.

[0078] (2) Apply the rigid reinforcement layer material evenly to the back of the mold shell with a thickness of 10 cm, excluding the reserved connection window, by extrusion equipment or manual extrusion;

[0079] (3), after the back of the mold shell is coated except for the reserved connecting window, a rigid reinforcing layer is obtained on the back after curing at room temperature for 8h.

[0080] Step five, after the back rigid reinforcing layer is formed, the female mold is demolded;

[0081] The bottom support adjusting device 2 adjusts the support for different profiles according to the curvature fluctuation of the profile, the curvature fluctuation of the profile is modeled in Pro / E software, the curvature change of the profile is obtained by combining ANASYS analysis software, and the profile support design is adjusted;

[0082] The bottom support adjusting device 2 is a telescopic piston rod powered by an air pump as a support element. When the mold shell needs to be supported, first determine the position of the bottom support adjusting device according to the results calculated in step two, then determine the profile curvature fluctuation according to the curved surface condition of the outer surface of the upper mold, model the profile curvature fluctuation in Pro / E software, combine ANASYS analysis software to obtain the curvature change of the profile, and finally determine the piston rod extension length according to the curvature change. After the slider 7 slides to the limit position on the guide rail 5, the slider 7 is slid to the limit position on the guide rail 5 by inserting the pin into the pin hole 8 in advance, thereby limiting the limit position of the slider 7 on the guide rail 5, thereby adjusting the extension height of the telescopic rod 61 on the two connecting device section steels 6, and the two connecting device section steels 6 and the plurality of sectional supports 3 are matched with the profile of the mold shell 30, thereby supporting the mold shell 30;

[0083] Step six, after the female mold is demolded, a rigid reinforcing layer is added;

[0084] The connecting device section steel 6 is welded and fixed with the round pipe on the back of the mold shell, and a hand lay-up layer is added around the round pipe for connection. Based on epoxy resin or gelling agent as a carrier, inorganic non-metallic ceramic filler groups are added as enhanced ceramic shells, which are coated on the surface of the back rigid reinforcing layer by hand lay-up;

[0085] Step seven, clamping

[0086] The turning arm 1 of the turning mechanism is welded on the turning cross-section steel frame, the hydraulic system controls the turning arm to work, and the turning realizes the turning of the upper mold, and finally the mold is clamped;

[0087] Step eight, install the clamping mechanism to connect the mold shell;

[0088] The upper and lower mold flange edges are preformed metal blocks 10 and electromagnets 9, the flange edge surface is provided with guiding concave-convex devices for aligning the relative positions of the upper and lower molds, the mold is locked and closed by the locking device 11 during the solidification of the blade by turning on and off the electromagnet 9, and the locking device 11 controls the connection and separation of the connection between the upper mold flange edge and the lower mold flange edge by hydraulic transmission or pneumatic transmission.

[0089] Step eight, laser detection and profile adjustment according to the mold 3D model

[0090] The upper mold is turned over to the upper mold by the turning mechanism, after the mold is closed, the places that need to be adjusted are detected by the laser detection mechanism, and then the profile of the upper mold and the lower mold after the mold is closed is adjusted by the polishing equipment or manually.

[0091] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the technicians skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A rigid wind turbine blade mould structure with quick changeable airfoil, characterised in that: It comprises: A support structure for supporting the upper die or the lower die and a clamping mechanism for clamping the upper die and the lower die together; The support structure comprises: a cross-section steel structure frame (20), a bottom support adjusting device (2), a sectional support (3), a support rod (4), a guide rail (5), a connecting device profile steel (6) and a sliding block (7), the cross-section steel structure frame (20) is sleeved on the turnover arm (1), the bottom support adjusting device (2) is vertically installed on the cross-section steel structure frame (20), one end of the connecting device profile steel (6) is vertically fixed at the bottom of the cross-section steel structure frame (20), the other end of the connecting device profile steel (6) is connected with the telescopic rod (61), the guide rail (5) is installed at the bottom of the cross-section steel structure frame (20), one end of the support rod (4) is hinged on the telescopic rod (61), the other end of the support rod (4) moves horizontally and linearly on the guide rail (5) through the sliding block (7); The clamping mechanism comprises: an electromagnet (9), a metal block (10) and a locking device (11), the electromagnet (9) or the metal block (10) is respectively installed in the flange edge of the upper die or the lower die, and the locking device (11) is sleeved at the connection between the upper die flange edge and the lower die flange edge; The connecting device profile steel (6) and the support rod (4) are respectively arranged symmetrically on the cross-section steel structure frame (20); The piston rod on the bottom support adjusting device (2) is detachably connected with the sectional support (3).

2. A rigid wind turbine blade mould structure with quick changeable airfoil according to claim 1, characterized in that: The sectional support (3) is shaped to match the shape of the outer surface of the mold shell (30) located above it.

3. A rigid wind turbine blade mould structure with quick changeable airfoil according to claim 1, characterized in that: The number of the bottom support adjusting device (2) is at least two.

4. A rigid wind turbine blade mould structure with quick changeable airfoil according to claim 1, characterized in that: The guide rail (5) is fixed at the bottom of the cross-section steel structure frame (20) by screw connection.

5. A rigid wind turbine blade mould structure with quick changeable airfoil according to claim 4, characterized in that: The guide rail (5) is provided with a latch hole (8) for limiting the sliding block (7).

6. A rigid wind turbine blade mold structure with quick changeable airfoil according to claim 1, characterized in that: The bottom support adjusting device (2) and the locking device (11) are respectively powered by a gas pump system or a hydraulic system connected with a PLC circuit.

7. A rigid wind turbine blade mold structure with quick changeable airfoil according to claim 1, characterized in that: The ends of two adjacent telescopic rods (61) are respectively connected with a support connecting rod (62) vertically.

8. A rigid wind turbine blade mould structure with quick changeable airfoil according to claim 1, characterized in that: The inner surfaces of the upper die flange edge and the lower die flange edge are provided with guide concave-convex blocks for aligning the relative positions of the upper die and the lower die.

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