Blade root wedge test piece and test tool

Abstract

The present application relates to the technical field of wind power blade manufacturing, and discloses a root wedge test piece and a test tool. The root wedge test piece comprises a test sample main body, at least two groups of embedded sleeves are arranged in the test sample main body, and a root wedge is arranged between adjacent embedded sleeves; at least one root wedge has a test section extending out of the test sample main body. The test tool comprises a clamping assembly and a connecting assembly for connecting with a tensile testing machine, the clamping assembly has a clamping space for clamping the test section of the root wedge, and the connecting assembly is connected with the clamping assembly. Since the test section extends out of the test sample main body, the test tool can be directly installed on the test section to perform a bearing capacity test and evaluate the safety of the root structure. The root wedge test piece provided by the present application can reduce the difficulty of the bearing capacity test and facilitate the detection of the operator.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade manufacturing technology, and in particular to a blade root wedge test piece and testing fixture. Background Technology

[0002] Wind power generation, as an important clean energy source, is becoming increasingly widespread. Blades, as a crucial component of wind turbines, are connected to the turbine hub via blade roots. With increasing blade size, the load on the blade roots also increases. Therefore, the industry is vigorously developing blade root connection technology, especially pre-embedded blade root connection technology. In pre-embedded blade root connections, threaded metal bolt sleeves are pre-embedded into the fiberglass of the blade root, and then the blade root is connected to the turbine hub with bolts. The spaces between the bolt sleeves are filled with blade root wedges. Pre-embedded blade root structures typically include blade root wedges, pre-embedded core material, and pre-embedded bolt sleeves, resulting in a complex interface. To obtain the load-bearing capacity of the pre-embedded blade root structure, testing methods are required.

[0003] Common failure modes in embedded blade roots include the removal of embedded bolt sleeves and blade root wedges. While there is relatively much research on the removal test of embedded bolt sleeves, there is a lack of research on the removal test of blade root wedges. Therefore, there is an urgent need to provide a blade root wedge test piece that facilitates load-bearing capacity testing. Summary of the Invention

[0004] This invention discloses a blade root wedge test piece and a test fixture. By changing its own structural design and cooperating with the test fixture, the blade root wedge test piece facilitates the load-bearing capacity test of the blade root wedge.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, this application provides a leaf root wedge test piece, comprising: a test sample body having at least two sets of pre-embedded threaded sleeves within the test sample body; a leaf root wedge being provided between adjacent pre-embedded threaded sleeves; and at least one of the leaf root wedges having a test section extending from the test sample body.

[0007] In the aforementioned blade root wedge test specimen, at least two sets of pre-embedded threaded sleeves are provided inside the main body of the test specimen, and blade root wedges are provided between adjacent pre-embedded threaded sleeves. When using a test fixture to test the bearing capacity of the blade root wedge, the test fixture can be mounted on the test section of the blade root wedge extending from the main body of the test specimen; after the test fixture is connected to the test section, the bearing capacity test can be performed.

[0008] At least one blade root wedge in the blade root wedge provided in this application has a test section extending from the main body of the sample to be tested. Since the test section protrudes from the main body of the sample to be tested, the test fixture can be directly installed on the test section to perform load-bearing capacity testing and evaluate the safety of the blade root structure.

[0009] Therefore, the blade root wedge test specimen provided in this application can reduce the difficulty of load-bearing capacity testing and facilitate the operation of the test.

[0010] Preferably, the cross-section of the leaf root wedge is I-shaped; or,

[0011] The cross-section of the leaf root wedge is rectangular.

[0012] Secondly, this application also provides a testing fixture for testing a blade root wedge test piece provided by any of the technical solutions in the first aspect above. The testing fixture includes a clamping assembly and a connecting assembly for connecting to a tensile testing machine. The clamping assembly has a clamping space for clamping the test section of the blade root wedge. The connecting assembly is connected to the clamping assembly.

[0013] The testing fixture provided in this application is used to test the blade root wedge test specimen provided by any of the technical solutions in the first aspect above. Specifically, the testing fixture includes a clamping assembly and a connecting assembly. When using the testing fixture provided in this application, the test section of the blade root wedge is placed in the clamping space of the clamping assembly, and the connecting assembly connects the clamping assembly to a tensile testing machine to test the load-bearing capacity of the blade root wedge.

[0014] The testing fixture provided in this application is used to connect with the test section of the blade root wedge in the blade root wedge test piece, which can conveniently and quickly realize the load-bearing capacity test of the blade root wedge test piece.

[0015] Preferably, the clamping assembly includes a first plate group and a second plate group. The first plate group includes two first plates arranged opposite each other along a first direction, and the second plate group includes two second plates arranged opposite each other along a second direction. The two first plates and the two second plate groups cooperate to form a clamping space.

[0016] Preferably, the first plate includes a first main body and a plurality of first extensions disposed on both sides of the first main body; the first extensions on each side of the first main body are spaced apart along the extension direction of the first main body.

[0017] The second plate includes a second main body and a plurality of second extensions disposed on both sides of the second main body; the second extensions on each side of the second main body are spaced apart along the extension direction of the second main body; and the first extensions and the second extensions are staggered along the extension direction of the second main body.

[0018] Preferably, the first extensions corresponding to the two first plates are connected by a first bolt; and / or, the second extensions corresponding to the two second plates are connected by a second bolt.

[0019] Preferably, the two first plates and the two second plates form a ring structure, and each first plate is connected to the adjacent second plate.

[0020] Preferably, the first plate and / or the second plate are provided with an anti-slip structure on the side facing the test section.

[0021] Preferably, the anti-slip structure is an anti-slip texture, and the shape of the anti-slip texture is at least one of grid, wave, serration or convex dots.

[0022] Preferably, when the cross-section of the leaf root wedge is I-shaped, each of the first plates is provided with a protrusion that matches the shape of the waist of the test section.

[0023] Preferably, the connecting assembly includes a base and a connecting rod. The base includes a base plate, one side of which is connected to the clamping assembly, and the other side is provided with a connecting part. One end of the connecting rod is connected to the connecting part, and the other end is used to connect to the tensile testing machine.

[0024] Preferably, the surface of the connecting rod is provided with an auxiliary anti-slip structure.

[0025] Preferably, the connecting rod is fixedly connected to the connecting part; or,

[0026] The connecting rod is pivotally connected to the connecting part.

[0027] Preferably, the clamping assembly has a first mating hole, the base plate has a second mating hole, the base plate and the clamping assembly are connected by bolts, and the bolts pass through the first mating hole and the second mating hole. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the leaf root wedge test piece provided in the embodiments of this application;

[0029] Figure 2 A schematic diagram of the structure of the leaf root wedge test piece provided in an embodiment of this application, viewed from another direction;

[0030] Figure 3 Another structural schematic diagram of the leaf root wedge test piece provided in the embodiments of this application;

[0031] Figure 4 A schematic diagram of the structure of the test fixture provided in this application after being installed on the blade root wedge test piece;

[0032] Figure 5 This is a schematic diagram of the structure of the first plate in the test fixture provided in the embodiments of this application;

[0033] Figure 6 For observations along direction M Figure 5 A schematic diagram of the structure of the first plate in the middle;

[0034] Figure 7 This is a schematic diagram of the structure of the second plate in the test fixture provided in the embodiments of this application;

[0035] Figure 8 For observations along direction M Figure 7 Schematic diagram of the structure of the second plate in the middle;

[0036] Figure 9 , Figure 10 as well as Figure 11 These are schematic diagrams showing the distribution of bolts in the test fixtures provided in the embodiments of this application;

[0037] Figure 12 This is a schematic diagram of the connecting components in the test fixture provided in the embodiments of this application;

[0038] Figure 13 and Figure 14 Observed from different directions Figure 11 The diagram shows the structural schematic of the connecting components.

[0039] Figure 15 This is a schematic diagram of the clamping component in the test fixture provided in the embodiments of this application;

[0040] Figure 16 for Figure 12 A schematic diagram of the middle connecting rod.

[0041] Icons: 10-Main body of the sample to be tested; 11-Embedded screw sleeve; 12-Leaf root wedge; 121-Test section; 20-Clamping assembly; 21-First plate; 211-First main body; 212-First extension; 22-Second plate; 221-Second main body; 222-Second extension; 30-Connecting assembly; 31-Base; 311-Base plate; 312-Connecting part; 32-Connecting rod. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Figure 1 This is a schematic diagram of the structure of the leaf root wedge test piece provided in the embodiments of this application. Figure 2 From Figure 1 A schematic diagram of the blade root wedge test specimen observed from direction M. It should be understood that direction M is the direction from the blade root side when observing the blade tip. Please refer to... Figure 1 and Figure 2 The structure shown in this application embodiment includes a leaf root wedge test piece comprising: a test sample body 10, wherein at least two sets of pre-embedded threaded sleeves 11 are provided within the test sample body 10. It should be understood that the exemplary... Figure 2 The diagram shows two sets of pre-embedded threaded sleeves 11, with a blade root wedge 12 between adjacent pre-embedded threaded sleeves 11. Each blade root wedge 12 has a test section 121 extending from the main body 10 of the sample to be tested. Of course, since there can be two or more sets of pre-embedded threaded sleeves 11 within the main body 10 of the sample to be tested, and each adjacent pre-embedded threaded sleeve 11 has a blade root wedge 12, at least one blade root wedge 12 can be provided with a test section 121.

[0044] When using a test fixture to test the bearing capacity of the blade root wedge 12, the test fixture can be mounted on the test section 121 of the blade root wedge 12; after the test fixture is connected to the test section 121, the bearing capacity test can be performed.

[0045] It should be noted that since the test section 121 protrudes from the main body 10 of the sample to be tested, the test fixture can be directly installed on the test section 121 to conduct load-bearing capacity tests and evaluate the safety of the blade root structure. Therefore, the blade root wedge test piece provided in this embodiment can reduce the difficulty of load-bearing capacity testing and facilitate inspection by operators. It is worth noting that the test section 121 can be removed after the test is completed.

[0046] Please continue to refer to this. Figure 1 As shown in the structure, the main body 10 of the test sample is also provided with a fixed connection hole A for connection with other structures.

[0047] It is worth noting that the leaf root wedge 12 is made by injection molding a mixture of fiberglass cloth and resin, and its cross-section can be as follows: Figure 2 The cross-section of the leaf root wedge 12 can be either an I-shaped or rectangular shape, as shown. Of course, the cross-section of the leaf root wedge 12 can also be a similar shape to the I-shaped or a similar shape to the rectangle, which will not be elaborated here.

[0048] This application also provides a testing fixture for testing the blade root wedge test piece in any of the above technical solutions. It is worth noting that the exemplary blade root wedge 12 has the following cross-section... Figure 3 The I-shape shown. Figure 4 This is a schematic diagram of the structure after the test fixture is installed on the blade root wedge test piece. (See diagram below.) Figure 4For the structure shown, the test tooling provided by the embodiments of the present application includes a clamping component 20 and a connecting component 30 for connecting to a tensile testing machine. The clamping component 20 has a clamping space for clamping the test section 121 of the blade root wedge 12; the connecting component 30 is connected to the clamping component 20.

[0049] When applying the test tooling provided by the embodiments of the present application, the test section 121 of the blade root wedge 12 is placed in the clamping space of the clamping component 20, and the connecting component 30 connects the clamping component 20 to the tensile testing machine to test the bearing capacity of the blade root wedge 12. It should be noted that the test tooling provided by the embodiments of the present application can cooperate with the test section 121 of the blade root wedge 12 to conveniently and quickly detect the bearing capacity of the blade root wedge test piece.

[0050] Exemplarily, as Figure 4 shown, the clamping component 20 includes a first plate group and a second plate group. The first plate group includes two first plates 21 arranged opposite to each other along a first direction as Figure 5 shown, and the second plate group includes two second plates 22 arranged opposite to each other along a second direction as Figure 7 shown. The two first plates 21 and the two second plates 22 cooperate to form a clamping space. The second direction is perpendicular to the first direction. It should be understood that when setting the structures of the first plate 21 and the second plate 22, there are multiple implementation manners, at least one of the following two implementation manners.

[0051] A specific implementation manner is as follows:

[0052] Figure 6 is the schematic diagram of the first plate body 21 observed along the direction M in Figure 5 . Combining Figure 5 for reference Figure 6 shown, the first plate body 21 includes a first main body portion 211 and a plurality of first extension portions 212 provided on both sides of the first main body portion 211. For clearer illustration, Figure 5 in, the first extension portions 212 and the first main body portion 211 are schematically separated by dashed lines. Along the extension direction of the first main body portion 211, the first extension portions 212 on each side of the first main body portion 211 are arranged at intervals. In other words, the first main body portion 211 and the plurality of first extension portions 212 cooperate to form a structure similar to the character "丰". It should be noted that since the cross-section of the blade root wedge 12 is in the shape of a工字, each first plate body 21 is provided with a protrusion B that matches the shape of the waist of the test section 121. Of course, when the cross-section of the blade root wedge 12 is rectangular, the first plate body 21 may not be provided with the structure of the protrusion B.

[0053] Figure 8 is the schematic diagram of the second plate body 22 observed along the direction M in Figure 7 . Combining Figure 7 Reference Figure 8 In the shown structure, the second plate body 22 includes a second main body portion 221 and a plurality of second extension portions 222 provided on both sides of the second main body portion 221. For a clearer illustration, Figure 7 in the figure, a dashed line is used to schematically separate the second extension portion 222 and the second main body portion 221. Along the extension direction of the second main body portion 221, the second extension portions 222 on each side of the second main body portion 221 are arranged at intervals. Similarly, the first main body portion 211 and the plurality of first extension portions 212 cooperate to form a structure similar to the Chinese character "丰".

[0054] It should be noted that after the first plate body 21 and the second plate body 22 are assembled, along the extension direction of the second main body portion 221, the first extension portions 212 will be arranged alternately with the second extension portions 222. In other words, after assembly, the first extension portions 212 are located in the gaps on both sides of the second extension portions 222, and at the same time, the second extension portions 222 are located in the gaps on both sides of the first extension portions 212.

[0055] Both the first plate body group and the second plate body group can be connected by bolts. Specifically, when connecting the first plate body group, first through holes S1 as shown in Figure 5 the figure can be respectively provided on the corresponding first extension portions 212 between the two first plate bodies 21. When a first bolt 23 as shown in Figure 9 the figure passes through the first through hole S1, the connection can be made. Similarly, when connecting the second plate body group, second through holes S2 as shown in Figure 7 the figure can be respectively provided on the corresponding second extension portions 222 between the two second plate bodies 22. When a second bolt 24 as shown in Figure 10 the figure passes through the first through hole S2, the connection can be made.

[0056] After both the first plate body group and the second plate body group are installed, the installation positions of the first bolt 23 and the second bolt 24 are as shown in Figure 11 the figure. Of course, it is also possible to only set two first plate bodies 21 to be connected by the first bolt 23, or only set two second plate bodies 22 to be connected by the second bolt 24.

[0057] It should be noted that in order to prevent the first plate body 21 and / or the second plate body 22 from falling off the test section 121 during the bearing capacity test, as a preferred implementation manner, an anti-slip structure can be provided on the side of the first plate body 21 and / or the second plate body 22 facing the test section 121. Exemplarily, the anti-slip structure is an anti-slip pattern, and the shape of the anti-slip pattern is at least one of grid, wave, sawtooth or bump, which can be specifically set according to requirements and will not be elaborated here.

[0058] In another specific embodiment, the two first plates 21 and the two second plates 22 form a ring structure. In other words, the two first plates 21 and the two second plates 22 form a U-shaped structure. When installing the four plates, each first plate 21 is connected to the adjacent second plate 22, and the specific connection method can be set according to requirements.

[0059] Figure 12 This is a structural schematic diagram of the connecting component 30. Figure 13 and Figure 14 Observed from different directions Figure 11 The diagram shows the structure of the connecting component 30. Figure 12 , Figure 13 and Figure 14 As shown, the connecting assembly 30 includes a base 31 and a connecting rod 32. For example, the base 31 can be a metal base 31. The base 31 includes a base plate 311, one side of which is connected to the clamping assembly 20, and the other side is provided with a connecting part 312.

[0060] It is worth noting that, such as Figure 15 The clamping assembly 20 shown is provided with a first mating hole C, and as... Figure 11 The base plate 311 shown is provided with a second mating hole D. The base plate 311 is connected to the clamping assembly 20 by bolts. Specifically, the bolts pass through the first mating hole C and the second mating hole D.

[0061] Please continue to refer to this. Figure 12 , Figure 13 and Figure 14 As shown in the structure, one end of the connecting rod 32 is connected to the connecting part 312, and the other end is used to connect to the tensile testing machine. The connecting rod 32 and the connecting part 312 can be fixedly connected or pivotally connected. When the connecting rod 32 and the connecting part 312 are pivotally connected, for example, by means of a pin or bolt, the connecting rod 32 can rotate at a certain angle through the pin.

[0062] Figure 16 for Figure 12 A schematic diagram of the connecting rod 32 is shown. To prevent slippage between the connecting rod 32 and the tensile testing machine, an auxiliary anti-slip structure E can be provided on the surface of the connecting rod 32. The specific structure of the auxiliary anti-slip structure E can be set according to requirements and will not be described in detail here.

[0063] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A testing fixture for testing blade root wedge test pieces, characterized in that, The leaf root wedge test piece includes a test sample body (10), the test sample body (10) is provided with at least two sets of pre-embedded threaded sleeves (11), and a leaf root wedge (12) is provided between adjacent pre-embedded threaded sleeves (11). At least one of the leaf root wedges (12) has a test section (121) extending from the test sample body (10). The testing fixture includes a clamping assembly (20) and a connecting assembly (30) for connecting to a tensile testing machine. The clamping assembly (20) has a clamping space for clamping the test section (121) of the leaf root wedge (12). The clamping assembly (20) includes a first plate group and a second plate group. The first plate group includes two first plates (21) arranged opposite to each other along a first direction. The second plate group includes two second plates (22) arranged opposite to each other along a second direction. The two first plates (21) and the two second plates (22) cooperate to form the clamping space. The connecting assembly (30) is connected to the clamping assembly (20). The connecting assembly (30) includes a base (31) and a connecting rod (32). The base (31) includes a base plate (311). One side of the base plate (311) is connected to the clamping assembly (20), and the other side is provided with a connecting part (312). One end of the connecting rod (32) is connected to the connecting part (312), and the other end is used to connect to the tensile testing machine.

2. The test fixture as described in claim 1, characterized in that, The cross-section of the leaf root wedge (12) is I-shaped; or, The cross-section of the leaf root wedge (12) is rectangular.

3. The test fixture as described in claim 1, characterized in that, The first plate (21) includes a first main body (211) and a plurality of first extensions (212) disposed on both sides of the first main body (211); along the extension direction of the first main body (211), the first extensions (212) on each side of the first main body (211) are spaced apart; The second plate (22) includes a second main body (221) and a plurality of second extensions (222) disposed on both sides of the second main body (221); along the extension direction of the second main body (221), the second extensions (222) on each side of the second main body (221) are spaced apart; and along the extension direction of the second main body (221), the first extension (212) and the second extensions (222) are staggered.

4. The test fixture as described in claim 3, characterized in that, The first extensions (212) corresponding to the two first plates (21) are connected by first bolts (23); and / or, The two second plates (22) are connected by the corresponding second extensions (222) via the second bolts (24).

5. The test fixture as described in claim 1, characterized in that, The two first plates (21) and the two second plates (22) form a ring structure, and each first plate (21) is connected to the adjacent second plate (22).

6. The test fixture as described in claim 3 or 5, characterized in that, The first plate (21) and / or the second plate (22) are provided with an anti-slip structure on the side facing the test section (121).

7. The test fixture as described in claim 6, characterized in that, The anti-slip structure is an anti-slip texture, and the shape of the anti-slip texture is at least one of the following: grid, wave, serration, or convex dots.

8. The test fixture as described in claim 7, characterized in that, When the cross-section of the leaf root wedge (12) is I-shaped, each of the first plates (21) is provided with a protrusion that matches the waist shape of the test section (121).

9. The test fixture as described in claim 1, characterized in that, The surface of the connecting rod (32) is provided with an auxiliary anti-slip structure.

10. The test fixture as described in claim 1 or 9, characterized in that, The connecting rod (32) is fixedly connected to the connecting part (312); or, The connecting rod (32) is pivotally connected to the connecting part (312).

11. The test fixture as described in claim 1, characterized in that, The clamping assembly (20) is provided with a first mating hole, and the base plate (311) is provided with a second mating hole. The base plate (311) and the clamping assembly (20) are connected by bolts, and the bolts pass through the first mating hole and the second mating hole.

Images