Wind turbine blade torsion test tooling and wind turbine blade torsion test method

Abstract

The embodiment of the present application provides a wind turbine blade torsion test tool and a wind turbine blade torsion test method. The wind turbine blade torsion test tool comprises a test table, a ring-shaped fixing device and a loading device. The ring-shaped fixing device is used for being sleeved outside a test section of the wind turbine blade along a length direction of the wind turbine blade. The loading device is used for applying a traction force to the ring-shaped fixing device through a cable, so that the wind turbine blade generates a detectable torsion deformation. According to the wind turbine blade torsion test tool provided by the embodiment of the present application, only the loading device applies a load to the wind turbine blade during the loading process, and no other load interferes with the wind turbine blade torsion test tool. Therefore, the force direction and the force arm of the loading device do not change when the loading device loads the load, and thus the torsion stiffness obtained by using the tool for analysis is more accurate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind power blades, and particularly relates to a wind power blade torsion test tool and a wind power blade torsion test method. BACKGROUND

[0002] A wind power blade is one of important components of a wind turbine for converting wind energy into mechanical energy, and is mainly made of composite materials, and the cost of the wind power blade accounts for more than 20% of the cost of the wind turbine. A large-power wind turbine needs a larger wind wheel to sweep wind, which means that the size of the wind power blade needs to be increased, and accordingly, the wind wheel needs to be matched with a large blade, so that the wind power blade bears more and more torsional deformation during use, and brings severe challenges to the torsional characteristics of the wind power blade. Designing accurate torsional stiffness of the wind power blade can avoid flutter of the blade and improve the service life of the blade. The torsional characteristics of the wind power blade include torsional stiffness, limit torque, torsional deformation and torsional mode, etc. Verification test of the torsional characteristics of the blade becomes a key technology. However, in the prior art, the force arm and the direction of the force change during the torsional test of the wind power blade, which causes deviation of the test torque of the wind power blade.

[0003] For example, the patent application with the application number 201780082954.3 and the title of "Torsion test of wind turbine blade" discloses a torsion test of a wind turbine blade. The support frame of the torsion test device of the invention includes a counterweight arranged to bear at least part of the weight of the load frame. In this way, the counterweight generates a force on the blade, so it cannot ensure that the couple generated by the test device of the torsion test of the wind power blade will pass through the torsion center, and therefore, after the torsional deformation of the blade, the force arm of the couple to the torsion center will change, and therefore, the torque generated by the couple will change, which will interfere with the accuracy of the test.

[0004] Therefore, there is an urgent need for a wind power blade torsion test tool and a torsion test method to solve this problem. SUMMARY

[0005] The application aims to provide a wind power blade torsion test tool and a wind power blade torsion test method to solve the problem of test accuracy in the torsion test of the wind power blade.

[0006] In order to achieve the above purpose, the application realizes the following technical solutions:

[0007] The first aspect of the present application provides a wind turbine blade torsion test tool, comprising: a ring-shaped fixing device, configured to be sleeved outside a test section of a wind turbine blade along a length direction of the wind turbine blade, the ring-shaped fixing device comprising a plurality of fixing points; and a loading device, connected with the fixing points through a cable, the loading device being configured to apply a traction force to the ring-shaped fixing device through the cable to cause the wind turbine blade to produce a detectable torsion deformation, and the direction from the fixing points to the center of the ring-shaped fixing device being the same as the direction of the traction force.

[0008] According to any one of the foregoing embodiments of the first aspect of the present application, the ring-shaped fixing device comprises a core fixing member and a ring-shaped fixing member, the core fixing member being configured to be sleeved outside the test section of the wind turbine blade along the length direction of the wind turbine blade, and the ring-shaped fixing member being sleeved outside the core fixing member, and the fixing points being arranged on the ring-shaped fixing member.

[0009] According to any one of the foregoing embodiments of the first aspect of the present application, at least one of the core fixing member and the ring-shaped fixing member of the ring-shaped fixing device comprises a first sub-member and a second sub-member that are detachably connected, and the first sub-member and the second sub-member form a cavity.

[0010] According to any one of the foregoing embodiments of the first aspect of the present application, the ring-shaped fixing member comprises a ring-shaped portion having a cavity and a protruding portion protruding from the outer surface of the ring-shaped portion, and the ring-shaped portion and the protruding portion are provided with a plurality of fixing points.

[0011] According to any one of the foregoing embodiments of the first aspect of the present application, the fixing points comprise first fixing points, second fixing points, third fixing points and fourth fixing points, the included angle between the first fixing points and the second fixing points and the line connecting the center of the ring-shaped fixing device is 90°-180°, and the included angle between the third fixing points and the fourth fixing points and the line connecting the center of the ring-shaped fixing device is 90°-180°.

[0012] According to any one of the foregoing embodiments of the first aspect of the present application, the ring-shaped portion has a first groove extending along the circumference of the ring-shaped portion, and at least one of the first fixing points and the second fixing points is arranged in the first groove, and the first groove is configured to limit the cable; and the protruding portion has a second groove extending along the circumference of the protruding portion, and at least one of the third fixing points and the fourth fixing points is arranged in the second groove, and the second groove is configured to limit the cable.

[0013] According to any one of the foregoing embodiments of the first aspect of the present application, the loading device comprises an actuator and a load sensor, the actuator and the load sensor being connected by the cable, the actuator being configured to pull the cable to cause the cable to generate a load on the ring-shaped fixing device, and the load sensor being configured to collect the load generated by the actuator.

[0014] The second aspect embodiment of the present application provides a wind turbine blade torsion test method, comprising: fixing the wind turbine blade to be tested on the test table using the wind turbine blade torsion test tool provided by any one of the preceding embodiments of the first aspect of the present application; sleeving the annular fixing device outside the test section of the wind turbine blade along the length direction of the wind turbine blade; connecting the cable connected with the loading device to the annular fixing device and the fixing points respectively, starting the loading device to pull the cable to apply a pulling force to the annular fixing device, so as to make the wind turbine blade produce a detectable torsion deformation; detecting the torsion deformation of the wind turbine blade; wherein the axis of the fixing points connected with the loading device to the annular fixing device is the same as the direction of the pulling force.

[0015] According to the embodiment of the second aspect of the present application, the cable connected with the loading device is connected with the plurality of fixing points around the annular fixing device, the loading device is started to pull the cable to apply a pulling force to the annular fixing device, so as to make the wind turbine blade produce a detectable torsion deformation, and the detection of the torsion deformation of the wind turbine blade comprises: connecting the cable connected with the loading device around the annular fixing device with the first fixing point or the second fixing point, starting the loading device to pull the cable to apply a pulling force to the annular fixing device, so as to make the wind turbine blade produce a detectable torsion deformation; detecting the first torsion deformation of the wind turbine blade; connecting the cable connected with the loading device around the annular fixing device with the third fixing point or the fourth fixing point, starting the loading device to pull the cable to apply a pulling force to the annular fixing device, so as to make the wind turbine blade produce a detectable torsion deformation; detecting the second torsion deformation of the wind turbine blade.

[0016] According to the embodiment of the second aspect of the present application, the cable connected with the loading device is connected with the plurality of fixing points around the annular fixing device, the loading device is started to pull the cable to apply a pulling force to the annular fixing device, so as to make the wind turbine blade produce a detectable torsion deformation, and the detection of the torsion deformation of the wind turbine blade comprises: connecting the cable connected with the loading device around the annular fixing device with the first fixing point and the second fixing point respectively; or connecting the cable connected with the loading device around the annular fixing device with the third fixing point and the fourth fixing point respectively; starting the loading device to pull the cable to apply a pulling force in opposite directions to the annular fixing device, so as to make the wind turbine blade produce a detectable torsion deformation; detecting the third torsion deformation of the wind turbine blade.

[0017] The wind turbine blade torsion test device and the wind turbine blade assembly structure provided by the embodiment of the present application are shown in the following figure. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0019] Figure 1 The wind turbine blade torsion test device and the wind turbine blade assembly structure provided by the embodiment of the present application are shown in the following figure.

[0020] Figure 2 The cross-sectional structure of the ring-shaped fixing device provided by the embodiment of the present application is shown in the following figure.

[0021] Figure 3 The cross-sectional structure of the ring-shaped fixing device provided by the embodiment of the present application is shown in the following figure.

[0022] Figure 4 The cross-sectional structure of the ring-shaped fixing device provided by the embodiment of the present application is shown in the following figure.

[0023] Figure 5 The flow chart of the wind turbine blade torsion test method provided by the embodiment of the present application is shown in the following figure.

[0024] Figure 6 The cross-sectional structure of the wind turbine blade provided by the embodiment of the present application is shown in the following figure.

[0025] Figure 7 The principle diagram of the torsion test method provided by the embodiment of the present application is shown in the following figure.

[0026] Figure 8 The principle diagram of the torsion test method provided by the embodiment of the present application is shown in the following figure.

[0027] Figure 9 The principle diagram of the torsion test method provided by the embodiment of the present application is shown in the following figure. BRIEF DESCRIPTION OF DRAWINGS

[0029] 1. test bench;

[0030] 2. ring fixing device; 21, core fixing member; 22, ring fixing member;

[0031] 23a, 23b, first sub-member; 24a, 24b, second sub-member;

[0032] 22a, ring portion; 22b, protrusion portion; 221, first fixing point; 222, second fixing point; 223, third fixing point; 224, fourth fixing point; 225, first recess; 226, second recess;

[0033] 3. loading device; 31, actuator; 32, load sensor;

[0034] 100, wind power blade; 101, leading edge; 102, trailing edge. DETAILED DESCRIPTION

[0035] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. The following detailed description is merely intended to explain the present application, and is not intended to limit the present application. The present application can be implemented without some of the specific details, which are well known to those skilled in the art. The following description of the embodiments is merely provided to give a better understanding of the present application by showing examples of the present application.

[0036] It should be noted that, in this document, relational terms such as "first", "second", "third", "fourth" and the like, are used solely to distinguish one entity or action from another, without necessarily implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", "includes", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0037] First, the wind power blade torsion test tool provided by the first aspect of the present application will be introduced below.

[0038] Please refer to Figure 1 and Figure 2The wind turbine blade torsion test tool provided in the first aspect of the present application comprises: a ring-shaped fixing device 2 and a loading device 3, the ring-shaped fixing device 2 is used to be sleeved outside the test section of the wind turbine blade 100 along the length direction of the wind turbine blade 100, and the ring-shaped fixing device 2 comprises a plurality of fixing points; the loading device 3 is connected with the fixing points through a cable around the ring-shaped fixing device 2, and the loading device 3 is used to apply a traction force to the ring-shaped fixing device 2 through the cable, so that the wind turbine blade 100 generates a detectable torsion deformation, and the direction from the fixing point to the axis of the ring-shaped fixing device 2 is the same as the direction of the traction force.

[0039] The ring-shaped fixing device 2 is annular, and the ring-shaped fixing device 2 is hollow, so that the ring-shaped fixing device 2 can be sleeved outside the wind turbine blade 100, and in order to enable the external force to be transmitted to the wind turbine blade 100 without damaging the wind turbine blade 100, a soft material can be arranged on the inner side of the ring-shaped fixing device 2 to closely contact the outer surface of the test section of the wind turbine blade 100. The fixing points in the form of fastener structures such as pull rings and buckles are arranged on the ring-shaped fixing device 2, so that one end of the cable can be connected with the fixing points on the ring-shaped fixing device 2, and the other end of the cable is connected with the loading device 3. The loading device 3 can specifically pull the cable to move linearly through a motor, an electric cylinder or the like.

[0040] In the wind turbine blade torsion test tool provided in the first aspect of the present application, the traction force applied by the loading device 3 can be more uniformly applied to the outside of the test section of the wind turbine blade 100 by directly contacting the ring-shaped fixing device 2 with the outside of the test section of the wind turbine blade 100; by arranging the fixing points on the ring-shaped fixing device 2 and arranging the loading device 3 to be connected with the fixing points through the cable around the ring-shaped fixing device 2, the wind turbine blade torsion test tool is not disturbed by other loads during detection, and the size and force arm of the force acting on the wind turbine blade 100 through the cable, the ring-shaped fixing device 2 and the loading device 3 do not change, so that the torsional stiffness measured by using the tool is more accurate.

[0041] In some optional embodiments, the ring-shaped fixing device 2 comprises a core fixing part 21 and a ring-shaped fixing part 22, the core fixing part 21 is sleeved outside the test section of the wind turbine blade 100 along the length direction of the wind turbine blade 100, the ring-shaped fixing part 22 is sleeved outside the core fixing part 21, and the fixing points are arranged on the ring-shaped fixing part 22.

[0042] In these alternative embodiments, the core fixing member 21 is sleeved outside the test section of the wind turbine blade 100 along the length direction of the wind turbine blade 100, and the core fixing member 21 directly contacts the outer surface of the test section of the wind turbine blade 100. Specifically, the core fixing member 21 is made of soft or elastic material, or a soft material such as rubber can be placed between the core fixing member 21 and the test section of the wind turbine blade 100 to ensure that the force between the wind turbine blade 100 and the core fixing member 21 is more uniform. The core fixing member 21 made of soft or elastic material can also absorb the load that may cause damage to the wind turbine blade 100. The annular fixing member 22 is sleeved outside the core fixing member 21, and the fixing points are arranged on the annular fixing member 22. When testing wind turbine blades 100 of different sizes or shapes, only the core fixing member 21 that is suitable for the size or shape of the other wind turbine blade 100 needs to be replaced, and the annular fixing member 22 does not need to be replaced, which can save the manufacturing cost of the annular fixing device 2. The core fixing member 21 and the annular fixing member 22 in the annular fixing device 2 can be arranged as a single closed structure, and the annular fixing device 2 needs to be moved along the length direction of the wind turbine blade 100 from the blade tip to be sleeved on the test section of the wind turbine blade 100.

[0043] In some alternative embodiments, at least one of the core fixing member 21 and the annular fixing member 22 of the annular fixing device 2 comprises a first sub-member and a second sub-member that are detachably connected, and the first sub-member and the second sub-member form a cavity in the shape of a ring.

[0044] For reference, please see Figure 3 In an embodiment, the core fixing member 21 comprises a first sub-member 23a and a second sub-member 24a that are detachably connected, and the annular fixing member 22 comprises a first sub-member 23b and a second sub-member 24b that are detachably connected. The core fixing member 21 and the annular fixing member 22 can be arranged as a structure formed by splicing the first sub-member and the second sub-member or more separate elements, so that the core fixing member 21 and the annular fixing member 22 can be directly spliced to correspond to the test section of the wind turbine blade 100, and the action of moving the annular fixing device 2 from the blade tip to the test section is omitted.

[0045] For reference, please see Figure 4 In some alternative embodiments, the annular fixing member 22 comprises an annular portion 22a having a cavity and a protruding portion 22b protruding from the outer surface of the annular portion 22a, and a plurality of fixing points are arranged on the annular portion 22a and the protruding portion 22b. The cavity of the annular portion 22a is used to accommodate the core fixing member 21, and the cavity of the protruding portion 22b is used to accommodate the annular portion 22a.

[0046] In these alternative embodiments, the distance from the fixed point to the axis of the ring-shaped fixing device 2 is the detection radius, by providing multiple fixed points on the ring-shaped portion 22a and the protruding portion 22b, multiple fixed points with different detection radii can be obtained, so that the wind turbine blade torsion test tool can have multiple test modes. The distance from the ring-shaped portion 22a and the protruding portion 22b to the axis of the ring-shaped fixing device 2 is not consistent, the distance from the ring-shaped portion 22a to the axis of the ring-shaped fixing device 2 is the first test radius R1, and the distance from the protruding portion 22b to the axis of the ring-shaped fixing device 2 is the second test radius R2. The first test radius R1 is smaller than the second test radius R2, and when the loading device 3 applies the same traction force to the ring-shaped portion 22a and the protruding portion 22b, the change of the torque with the change of the force arm can be detected.

[0047] In some alternative embodiments, the fixed points include a first fixed point 221, a second fixed point 222, a third fixed point 223, and a fourth fixed point 224, the angle between the line connecting the first fixed point 221 and the second fixed point 222 and the axis of the ring-shaped fixing device 2 is 90°-180°, and the angle between the line connecting the third fixed point 223 and the fourth fixed point 224 and the axis of the ring-shaped fixing device 2 is 90°-180°.

[0048] In these alternative embodiments, the way the cable is wound around the ring-shaped fixing member 22 is not limited by the present application. In one embodiment, one end of the cable is connected to the fixed point, and after winding around the ring-shaped fixing member 22 one turn, it is connected to the loading device 3; in another embodiment, one end of the cable is connected to the fixed point, and after winding around the ring-shaped fixing member 22 one quarter turn, it is connected to the loading device 3.

[0049] In one embodiment, the cable connected to the loading device 3 is connected to the first fixed point 221 or the second fixed point 222, and the cable connected to the loading device 3 is connected to the third fixed point 223 or the fourth fixed point 224, and the loading device 3 is started to pull the cable to apply a traction force, so that the wind turbine blade 100 produces a detectable torsional deformation.

[0050] In another embodiment, the cable connected to the loading device 3 is connected to the first fixed point 221 and the second fixed point 223 respectively, and the loading device 3 is started to pull the cable to apply a traction force, so that the wind turbine blade 100 produces a detectable torsional deformation. In another embodiment, the cable connected to the loading device 3 is connected to the third fixed point 223 and the fourth fixed point 224 respectively, and the loading device 3 is started to pull the cable to apply a traction force, so that the wind turbine blade 100 produces a detectable torsional deformation.

[0051] In these optional embodiments, the loading device 3 can be selectively connected to one or more of the first fixing point 221, the second fixing point 222, the third fixing point 223 and the fourth fixing point 224 of the annular portion 22a and the protruding portion 22b through the cable winding around the annular fixing device 2, and can selectively apply a pulling force to one or more of the first fixing point 221, the second fixing point 222, the third fixing point 223 or the fourth fixing point 224.

[0052] In some optional embodiments, the annular portion 22a has a first groove 225 extending circumferentially along the annular portion 22a, and at least one of the first fixing point 221 and the second fixing point 222 is arranged in the first groove 225, and the first groove 225 is used for limiting the cable; the protruding portion 22b has a second groove 226 extending circumferentially along the protruding portion 22b, and at least one of the third fixing point 223 or the fourth fixing point 224 is arranged in the second groove 226, and the second groove 226 is used for limiting the cable.

[0053] In these optional embodiments, after the cable is connected to the first fixing point 221 or the second fixing point 222, the cable is limited in the first groove 225 along the annular portion 22a, and during the loading process in which the loading device 3 applies the pulling force, the cable is limited in the first groove 225, and the direction of the pulling force is always along the tangent direction of the annular portion 22a, and the direction of the pulling force does not change. After the cable is connected to the third fixing point 223 or the fourth fixing point 224, the cable is limited in the second groove 226 along the protruding portion 22b, and during the loading process in which the loading device 3 applies the pulling force, the cable is limited in the second groove 226, and the direction of the pulling force is always along the tangent direction of the protruding portion 22b, and the direction of the pulling force does not change.

[0054] In some optional embodiments, the loading device 3 includes an actuator 31 and a load sensor 32, the actuator 31 and the load sensor 32 are connected by the cable, the actuator 31 is used to pull the cable to generate a load on the annular fixing device 2, and the load sensor 32 is used to collect the load generated by the actuator 31.

[0055] In these optional embodiments, the actuator 31 is used to pull the cable to generate a load, so as to twist the wind turbine blade 100 around its length direction, thereby generating a torsional load. The load sensor 32 is used to collect the load generated by the actuator 31, and the torsional load is used to evaluate the torsional stiffness of the wind turbine blade 100. According to the torsional deformation angle at the position of the test section of the wind turbine blade 100, the relationship between the torsional torque and the torsional angle at the position of the test section of the wind turbine blade 100 is analyzed, and the torsional stiffness of the test section of the wind turbine blade 100 is obtained.

[0056] Referring to Figure 5 The wind turbine blade torsional test method provided by the second aspect of the present application can include the following steps:

[0057] S100, providing a wind turbine blade torsion test tool as provided in the first aspect of the application, fixing the wind turbine blade to be tested on a test table;

[0058] S200, sleeving an annular fixing device outside the test section of the wind turbine blade along the length direction of the wind turbine blade;

[0059] S300, connecting the cable connected with the loading device to the fixing points on the annular fixing device respectively, starting the loading device to apply a traction force to the annular fixing device through the cable, so as to make the wind turbine blade produce a detectable torsion deformation, and detecting the torsion deformation of the wind turbine blade, wherein the axis of the fixing points connected with the loading device to the annular fixing device is the same as the direction of the traction force.

[0060] In the wind turbine blade torsion test method provided in the second aspect of the application, the traction force applied by the loading device can be more uniformly applied to the outside of the test section of the wind turbine blade by directly contacting the annular fixing device with the outside of the test section of the wind turbine blade; by setting the fixing points on the annular fixing device and setting the loading device to be connected to the fixing points on the annular fixing device through the cable, the direction of the force and the length of the force arm acting on the wind turbine blade through the cable and the annular fixing device do not change during detection, which ensures that the torsion torque stiffness obtained by analyzing the torsion deformation of the wind turbine blade detected is more accurate.

[0061] Please refer to Figure 6In these optional embodiments, the test bench 1 can be a structure such as a bench, a mounting table, or the like fixed to the ground to support and fix the wind turbine blade 100, so as to avoid the influence of the gravity of the wind turbine blade 100 on the test results, and avoid the relative rotation of the wind turbine blade 100 with the test bench 1 caused by the force applied by the loading device 3, so as to affect the accuracy of the detection results. The test bench 1 and the root end of the wind turbine blade 100 are fixed in a detachable manner, which can be achieved by bolted connection, flange connection, buckle connection, or hinge connection. The wind turbine blade 100 includes a blade root end and a blade tip end arranged oppositely, the length direction of the wind turbine blade 100 is the direction from the blade root end to the blade tip end, and the pendulum direction of the wind turbine blade 100 is the extension direction of the leading edge 101 to the trailing edge 102 of the wind turbine blade 100. The test section of the wind turbine blade 100 refers to any region along the length direction of the wind turbine blade 100 that needs to be tested. When the wind turbine blade 100 is fixed to the test bench 1, the length direction of the wind turbine blade 100 is parallel to the ground, the pendulum direction of the wind turbine blade 100 is parallel to the vertical direction, the leading edge 101 of the wind turbine blade 100 faces downward, and the trailing edge 102 of the wind turbine blade 100 faces upward, so that the deflection of the wind turbine blade 100 under its own weight is small, the wind turbine blade 100 is in a deflection state that can better represent the actual state of the wind turbine blade during operation to evaluate the torsional stiffness of the blade, and the accuracy of the test results can be improved. The first sub-piece 23a and the second sub-piece 24a of the core fixing piece 21 and the first sub-piece 23b and the second sub-piece 24b of the annular fixing piece 22 can be spliced along the pendulum direction of the wind turbine blade 100.

[0062] As an optional embodiment, S300 can include:

[0063] S310, connecting the cable connected with the loading device around the annular fixing device to the first fixing point or the second fixing point, starting the loading device to apply a traction force to the annular fixing device through the cable, so as to make the wind turbine blade produce a detectable torsional deformation;

[0064] S320, detecting the first torsional deformation of the wind turbine blade;

[0065] S330, connecting the cable connected with the loading device around the annular fixing device to the third fixing point or the fourth fixing point, starting the loading device to apply a traction force to the annular fixing device through the cable, so as to make the wind turbine blade produce a detectable torsional deformation;

[0066] S340, detecting the second torsional deformation of the wind turbine blade.

[0067] Please refer to Figure 7, S310 and S320, the loading device 3 is connected to one of the first fixed point 221 or the second fixed point 222, the loading device 3 is connected to one of the third fixed point 223 or the fourth fixed point 224, and the same size of traction force F1 and F2 is applied, and through the difference between the first torsional deformation and the second torsional deformation, the torque corresponding to the difference between the first test radius R1 and the second test radius R2 can be calculated.

[0068] In another embodiment, the above-mentioned S300 can include:

[0069] S350, the cable connected with the loading device is connected with the first fixed point and the second fixed point, respectively, around the annular fixed device;

[0070] S360, the loading device is started to pull the cable to apply a traction force to the annular fixed device to make the wind turbine blade produce a detectable torsional deformation;

[0071] S370, detecting the third torsional deformation of the wind turbine blade.

[0072] Please refer to Figure 8 The cable connected with the loading device 3 is connected with the first fixed point 221 and the second fixed point 222, respectively, around the annular fixed device 2, the loading device 3 is started to pull the cable to apply a traction force F1 and F2 to the annular part 22a, the torque arm is the first test radius R1, and the wind turbine blade 100 produces a detectable torsional deformation, and the torsional stiffness of the wind turbine blade 100 can be analyzed.

[0073] In another embodiment, the above-mentioned S300 can include:

[0074] S380, the cable connected with the loading device is connected with the third fixed point and the fourth fixed point, respectively, around the annular fixed device, and then S360 and S370 are implemented.

[0075] Please refer to Figure 9 The cable connected with the loading device 3 is connected with the third fixed point 223 and the fourth fixed point 224, respectively, around the annular fixed device 2, the loading device 3 is started to pull the cable to apply a traction force F1 and F2 to the protruding part 22b, the torque arm is the second test radius R2, and the wind turbine blade 100 produces a detectable torsional deformation, and the torsional stiffness of the wind turbine blade 100 can be analyzed.

[0076] The above is only a specific embodiment of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, it should be understood that the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application.

Claims

1. A torsion testing fixture for wind turbine blades, characterized in that, include: A ring-shaped fixing device is used to be sleeved on the outside of the test section of the wind turbine blade along the length direction of the wind turbine blade. The ring-shaped fixing device includes multiple fixing points. The loading device is connected to the fixing point by a cable wrapped around the annular fixing device. The loading device is used to pull the cable to apply a traction force to the annular fixing device so that the wind turbine blade produces a detectable torsional deformation. The direction from the fixing point to the axis of the annular fixing device is the same as the direction of the traction force. The annular fixing device includes a core fixing component and an annular fixing component. The core fixing component is sleeved on the outside of the test section of the wind turbine blade along the length direction of the wind turbine blade. The annular fixing component is sleeved on the outside of the core fixing component. The fixing point is set on the annular fixing component. The annular fastener includes an annular portion with a cavity and a protrusion extending from the outer surface of the annular portion. The annular portion and the protrusion are provided with a plurality of fixing points. The cavity of the annular portion is used to accommodate the core fastener, and the cavity of the protrusion is used to accommodate the annular portion.

2. The wind turbine blade torsion testing fixture according to claim 1, characterized in that, The annular fixing device includes at least one of the core fixing member and the annular fixing member, which includes a first sub-member and a second sub-member that are detachably connected, and the first sub-member and the second sub-member form an annular cavity.

3. The wind turbine blade torsion testing fixture according to claim 1, characterized in that, The fixing points include a first fixing point, a second fixing point, a third fixing point, and a fourth fixing point. The angle between the lines connecting the first fixing point and the second fixing point and the axis of the annular fixing device is 90° to 180°, and the angle between the lines connecting the third fixing point and the fourth fixing point and the axis of the annular fixing device is 90° to 180°.

4. The wind turbine blade torsion testing fixture according to claim 3, characterized in that, The annular portion has a first groove extending circumferentially along the annular portion, and at least one of the first fixing point and the second fixing point is provided in the first groove; the first groove is used to limit the cable. The protrusion has a second groove extending circumferentially along the protrusion, and at least one of the third fixing point and the fourth fixing point is provided in the second groove, which is used to limit the cable.

5. The wind turbine blade torsion testing fixture according to any one of claims 1 to 4, characterized in that, The loading device includes an actuator and a load sensor, which are connected by a cable. The actuator is used to pull the cable so that the cable generates a load on the annular fixing device, and the load sensor is used to collect the load generated by the actuator.

6. A method for testing the torsion of wind turbine blades, characterized in that, The testing method includes: A torsion testing fixture for wind turbine blades as described in any one of claims 1 to 5 is provided, wherein the wind turbine blade to be tested is fixed on a test bench; and the annular fixing device is sleeved on the outside of the test section of the wind turbine blade along the length direction of the wind turbine blade. The cable connected to the loading device is wound around the annular fixing device and connected to the fixing point respectively. The loading device is activated to pull the cable to apply traction force to the annular fixing device so that the wind turbine blade produces detectable torsional deformation. Detect the torsional deformation of the wind turbine blades; Wherein, the direction of the fixed point connected to the loading device to the axis of the annular fixing device is the same as that of the traction force.

7. The wind turbine blade torsion test method according to claim 6, characterized in that, The cable connected to the loading device is wound around the annular fixing device and connected to multiple fixing points respectively. The loading device is activated to pull the cable to apply traction force to the annular fixing device, so as to cause the wind turbine blade to produce detectable torsional deformation. The detection of the torsional deformation of the wind turbine blade includes: The cable connected to the loading device is wound around the annular fixing device and connected to the first fixing point or the second fixing point. The loading device is activated to pull the cable to apply traction force to the annular fixing device, so that the wind turbine blade produces a detectable torsional deformation. The first torsional deformation of the wind turbine blade was detected; The cable connected to the loading device is wound around the annular fixing device and connected to the third or fourth fixing point. The loading device is activated to pull the cable to apply traction force to the annular fixing device, so that the wind turbine blade produces a detectable torsional deformation. The second torsional deformation of the wind turbine blade is detected.

8. The wind turbine blade torsion test method according to claim 6, characterized in that, The cable connected to the loading device is wound around the annular fixing device and connected to multiple fixing points respectively. The loading device is activated to pull the cable to apply traction force to the annular fixing device, so as to cause the wind turbine blade to produce detectable torsional deformation. The detection of the torsional deformation of the wind turbine blade includes: The cable connected to the loading device is wound around the annular fixing device and connected to the first fixing point and the second fixing point respectively; or the cable connected to the loading device is wound around the annular fixing device and connected to the third fixing point and the fourth fixing point respectively. The loading device is activated to pull the cable and apply a pulling force in the opposite direction to the annular fixing device, so that the wind turbine blade produces a detectable torsional deformation. The third torsional deformation of the wind turbine blade was detected.

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