Ultra-large load trailing edge buckling test tool

Abstract

The utility model relates to the technical field of testing tools, in particular to a super-large load trailing edge buckling testing tool which comprises a base and a testing assembly. The base is arranged on the horizontal plane and comprises two oppositely-arranged stand columns, and the testing assembly is horizontally arranged between the two stand columns. The testing assembly comprises two rotating arms which are oppositely arranged, the two rotating arms are rotationally connected with the stand column, a positioning piece is arranged on the side, away from the stand column, of each rotating arm, the positioning pieces are bolt sleeve assemblies formed through resin pouring, each positioning piece is provided with a through groove consistent with the curved surface of the wind power blade, and the two ends of the wind power blade are arranged in the through grooves respectively. A driving unit is arranged between the ends, away from the horizontal plane, of the two rotating arms and extrudes the rotating arms. According to the utility model, the bolt sleeve assembly formed by resin pouring is arranged to replace an existing wooden clamp, so that the fixed connection between the positioning piece and the wind power blade is ensured, the fitting property of the testing tool and the wind power blade is improved, and the detection precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of testing tooling, in particular to a super-large load trailing edge buckling testing tooling. Background Art

[0002] Wind turbine blades are important components of wind power generation equipment. Since they have to withstand wind force for a long time in the later stage, wind turbine blade failure assessment is an important link in blade development and before they are put into use. The trailing edge of wind turbine blades is an area that is easily damaged during the use of the blades. Failure assessment of the trailing edge area of ​​wind turbine blades can effectively control the defects in the blade structure, improve the stability of the blades during use, and extend the service life of the blades.

[0003] The existing testing device for the trailing edge buckling of wind turbine blades uses a wooden positioning piece to clamp the two ends of the wind turbine blade, applies static or dynamic pressure to the wind turbine blade through a linear drive, and then uses a sensor to record force and displacement data to observe the buckling of the wind turbine blade. However, since the load on the wind turbine blade is too large in most cases, the clamping and fixing of the wooden positioning piece is difficult to fully fit the wind turbine blade, resulting in an unreliable connection between the wind turbine blade with an overload and the test device during the test, which makes it easy for the failure point of the buckling deformation to deviate, affecting the test results.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a super-large load trailing edge buckling test tool to solve the above technical problems.

[0006] To achieve the above purpose, the technical solution of the utility model is:

[0007] An ultra-large load trailing edge buckling test fixture comprises a base and a test assembly;

[0008] The base is arranged on a horizontal plane and comprises two oppositely arranged upright posts, and the test assembly is arranged horizontally between the two upright posts;

[0009] The test assembly includes two oppositely arranged rotating arms, which are rotatably connected to the columns respectively. A positioning piece is provided on the side of each rotating arm away from the column. The positioning piece is a bolt sleeve assembly formed by resin infusion. Each positioning piece is provided with a through groove consistent with the curved surface of the wind turbine blade. The two ends of the wind turbine blade are respectively arranged in the through groove. A driving unit is provided between the ends of the two rotating arms away from the horizontal plane, and the driving unit squeezes the rotating arm.

[0010] Furthermore, the positioning member includes a positioning plate and a screw sleeve arranged along the circumference of the positioning plate and fixed vertically to the positioning plate. The positioning plate is provided with a through groove consistent with the curved surface of the wind turbine blade.

[0011] Furthermore, fabrics are laid on the outer sides of the positioning plate and the screw sleeve, and resin is arranged between the fabrics, between the fabrics and the screw sleeve, and between the fabrics and the positioning plate.

[0012] Furthermore, the width of the fabric is greater than the length of the screw sleeve.

[0013] Furthermore, a heightening column is arranged on one side of each column facing the test assembly, the two heightening columns are at the same height relative to the horizontal plane, and the two rotating arms are rotatably connected to the heightening columns respectively.

[0014] Furthermore, a crossbeam is provided between the two columns, and the crossbeam is fixed to the columns through a pull plate.

[0015] Furthermore, the pull plate is arranged between the heightened column and the horizontal plane, and a gap is arranged between the crossbeam and the rotating arm.

[0016] Furthermore, a sensor is provided between the rotating arm and the driving unit for detecting the squeezing force exerted on the wind turbine blade during the experiment.

[0017] Furthermore, a connecting pier is arranged on the end of the rotating arm away from the horizontal plane and on the side away from the column, a connecting part is arranged between the two connecting piers, and the driving unit is arranged between the connecting parts and is hinged to the connecting parts.

[0018] Furthermore, the height of the column is 6 meters.

[0019] The beneficial effects of the utility model are as follows: the utility model replaces the existing wooden fixture with a bolt sleeve assembly formed by resin injection, thereby ensuring the fixed connection between the positioning member and the wind turbine blade, improving the fit between the test fixture and the wind turbine blade, and improving the accuracy of the failure point during the test process, which is suitable for compression fatigue / static testing and improves the test accuracy. Compared with the prior art, the bolt sleeve assembly in the present application is injection-molded on the surface of the wind turbine blade, ensuring the reinforcement effect of the root of the wind turbine blade during the test process, and improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1This is a schematic diagram of the installation of the ultra-large load trailing edge buckling test tool in the embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the ultra-large load trailing edge buckling test tool in an embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the test assembly in the embodiment of the utility model;

[0024] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0025] Figure 5 This is a schematic diagram of the structure of the positioning member in the embodiment of the utility model;

[0026] Explanation of the reference numerals: 01, horizontal plane; 10, base; 11, column; 12, heightening column; 13, crossbeam; 14, pull plate; 20, test assembly; 21, rotating arm; 22, positioning piece; 221, positioning plate; 222, screw sleeve; 223, fabric; 224, resin; 23, through groove; 24, drive unit; 25, connecting pier; 26, connecting part; 30, wind turbine blade. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] like Figures 1 to 5 An ultra-large load trailing edge buckling test fixture shown includes a base 10 and a test assembly 20;

[0031] The base 10 is disposed on a horizontal plane 01 and includes two oppositely disposed upright posts 11, and the test assembly 20 is horizontally disposed between the two upright posts 11;

[0032] The test assembly 20 includes two rotating arms 21 arranged opposite to each other. The two rotating arms 21 are respectively connected to the column 11 for rotation. A positioning member 22 is arranged on the side of each rotating arm 21 away from the column 11. The positioning member 22 is a bolt sleeve assembly formed by resin 224 injection molding. A through slot 23 consistent with the curved surface of the wind turbine blade 30 is opened on each positioning member 22. The two ends of the wind turbine blade 30 are respectively arranged in the through slot 23. A driving unit 24 is arranged between the ends of the two rotating arms 21 away from the horizontal plane 01. The driving unit 24 squeezes the rotating arms 21. Specifically, the two rotating arms 21 limit the length direction of the wind turbine blade 30, and the positioning member 22 limits the width direction of the wind turbine blade 30. Pressure is applied to the wind turbine blade 30 by the retraction of the piston rod in the driving unit 24. The piston rod retracts to a preset length, and the wind turbine blade 30 is evaluated for failure.

[0033] The utility model replaces the existing wooden fixture by providing a bolt sleeve assembly made of resin 224, thereby ensuring the fixed connection between the positioning member 22 and the wind turbine blade 30, improving the fit between the test fixture and the wind turbine blade 30, and improving the accuracy of the failure point during the test process, which is suitable for compression fatigue / static testing and improves the test accuracy. Compared with the prior art, the bolt sleeve assembly in the present application is cast on the surface of the wind turbine blade 30, ensuring the reinforcement effect of the root of the wind turbine blade 30 during the test process, and improving the test accuracy.

[0034] like Figure 5 As shown, the screw sleeve 222 assembly includes a positioning plate 221, and a screw sleeve 222 arranged along the circumference of the positioning plate 221 and fixed vertically to the positioning plate 221. The positioning plate 221 is provided with a through groove 23 consistent with the curved surface of the wind turbine blade 30. The outer sides of the positioning plate 221 and the screw sleeve 222 are paved with fabric 223, and the resin 224 is arranged between the fabric 223, between the fabric 223 and the screw sleeve 222, and between the fabric 223 and the positioning plate 221. In the present application, the bolt sleeve assembly is injection molded on the surface of the wind turbine blade 30, and is completely fitted with the wind turbine blade 30, and the positioning member 22 is fixed on the rotating arm 21, and the displacement of the positioning member 22 is limited, thereby ensuring the fixation of the wind turbine blade 30.

[0035] like Figure 2 As shown, a heightening column 12 is provided on one side of each column 11 facing the test assembly 20 , the two heightening columns 12 are at the same height relative to the horizontal plane 01 , and the two rotating arms 21 are rotatably connected to the heightening columns 12 , respectively.

[0036] like Figure 1As shown, a crossbeam 13 is also provided between the two columns 11, and the crossbeam 13 is fixed to the column 11 through a pull plate 14. The pull plate 14 is provided between the heightening column 12 and the horizontal plane 01, and a gap is provided between the crossbeam 13 and the rotating arm 21. The crossbeam 13 is used to ensure the stability of the column 11, and a gap is provided between the crossbeam 13 and the rotating arm 21, so that when the rotating arm 21 rotates around the heightening column 12 under the action of the driving unit 24, no friction is generated between the crossbeam 13, thereby extending the service life of the device.

[0037] Preferably, a sensor is further provided between the rotating arm 21 and the driving unit 24 for detecting the squeezing force exerted on the wind turbine blade 30 during the experiment.

[0038] like Figure 3~4 As shown, a connecting pier 25 is provided on the end of the rotating arm 21 away from the horizontal plane 01 and on the side away from the column 11 , a connecting portion 26 is provided between the two connecting piers 25 , and the driving unit 24 is provided between the connecting portions 26 .

[0039] Specifically, the driving unit 24 is a hydraulic cylinder, the cylinder body of the hydraulic cylinder is hinged to a connection part 26, the piston rod of the hydraulic cylinder is fixedly connected to the sensor, and the other end of the sensor is hinged to another connection part 26. This allows the hydraulic cylinder to have a certain degree of freedom within a relatively small stroke, thereby improving the detection flexibility of the hydraulic cylinder.

[0040] In this embodiment, the height of the column 11 is 6 meters, which ensures the force stability of the wind turbine blade 30 during the detection process and improves the test accuracy.

[0041] Specifically, the process of forming the positioning piece by injection is as follows:

[0042] (1) First make the upper surface, set the positioning plate, and lay several layers of fabric on the shell surface. The fabric includes uniaxial fabric, biaxial fabric and triaxial fabric. The fabric length needs to be longer than the screw sleeve. (2) The small mechanism is adjusted to make the screw sleeve perpendicular to the surface of the positioning plate. (3) Arrange the screw sleeve, UD rod and foam and other materials. (4) Then lay several layers of fabric on the surface. The fabric includes uniaxial fabric, biaxial fabric and triaxial fabric. (5) Lay the demoulding cloth, guide net, flow channel, and vacuum bag film. After the vacuum pressure is no problem, it can be poured. (6) After the upper surface reinforcement pouring and curing is completed, turn the blade over and pour the lower surface in the same way. (7) Ensure that the root reinforcement position does not fail during the test to achieve the purpose.

[0043] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A super-large load trailing edge buckling test tool, characterized in that: Includes base and test assembly; The base is arranged on a horizontal plane and comprises two oppositely arranged upright posts, and the test assembly is arranged horizontally between the two upright posts; The test assembly includes two oppositely arranged rotating arms, which are rotatably connected to the columns respectively. A positioning piece is provided on the side of each rotating arm away from the column. The positioning piece is a bolt sleeve assembly formed by resin infusion molding. Each of the positioning pieces is provided with a through groove consistent with the curved surface of the wind turbine blade. Both ends of the wind turbine blade are respectively arranged in the through groove. A driving unit is provided between the ends of the two rotating arms away from the horizontal plane, and the driving unit squeezes the rotating arms.

2. The ultra-large load trailing edge buckling test fixture according to claim 1, characterized in that: The positioning member comprises a positioning plate and a screw sleeve which is arranged along the perimeter of the positioning plate and is vertically fixed to the positioning plate. The positioning plate is provided with a through groove which is consistent with the curved surface of the wind turbine blade.

3. The ultra-large load trailing edge buckling test tool according to claim 2, characterized in that: Fabrics are laid on the outer sides of the positioning plate and the screw sleeve, and resin is arranged between the fabrics, between the fabric and the screw sleeve, and between the fabric and the positioning plate.

4. The ultra-large load trailing edge buckling test fixture according to claim 3, characterized in that: The width of the fabric is greater than the length of the screw sleeve.

5. The ultra-large load trailing edge buckling test tool according to claim 1, characterized in that: A heightening column is arranged on one side of each of the columns facing the test assembly, the two heightening columns are at the same height relative to the horizontal plane, and the two rotating arms are respectively rotatably connected to the heightening columns.

6. The ultra-large load trailing edge buckling test fixture according to claim 5, characterized in that: A crossbeam is also arranged between the two upright posts, and the crossbeam is fixed on the upright posts through a pull plate.

7. The ultra-large load trailing edge buckling test tool according to claim 6, characterized in that: The pull plate is arranged between the heightening column and the horizontal plane, and a gap is arranged between the cross beam and the rotating arm.

8. The ultra-large load trailing edge buckling test tool according to claim 1, characterized in that: A sensor is also provided between the rotating arm and the driving unit for detecting the squeezing force exerted on the wind turbine blade during the experiment.

9. The ultra-large load trailing edge buckling test tool according to claim 8, characterized in that: A connecting pier is arranged on the end of the rotating arm away from the horizontal plane and on the side away from the column, a connecting part is arranged between two connecting piers, and the driving unit is arranged between the connecting parts and is hinged to the connecting parts.

10. The ultra-large load trailing edge buckling test tool according to claim 1, characterized in that: The height of the column is 6 meters.

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