Tension fatigue test tool for wind turbine blade

Abstract

The utility model discloses a wind turbine blade tension fatigue test tool which comprises an upper connecting piece, a lower connecting piece, two guide assemblies and two adjustable clamping assemblies, the two adjustable clamping assemblies are symmetrically arranged up and down, and a sample placed between the two adjustable clamping assemblies is clamped through the two adjustable clamping assemblies. Wherein the top of the upper adjustable clamping assembly is hinged to the bottom of an upper connecting piece, the top of the upper connecting piece is connected with an actuator of the fatigue testing machine, the bottom of the lower adjustable clamping assembly is hinged to the top of a lower connecting piece, and the bottom of the lower connecting piece is connected with a base of the fatigue testing machine. The two guide assemblies are symmetrically arranged on the two side faces of the upper connecting piece, and guide wheels of the two guide assemblies can be attached to a guide plate of the fatigue testing machine, so that lateral loads borne by the actuator are eliminated. According to the utility model, the problem that a single asymmetric structure sample cannot be tested independently is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation blade component testing, in particular to a wind turbine blade tension fatigue testing tool. Background Art

[0002] Tensile fatigue testing is a test method used to evaluate the fatigue performance of materials under cyclic loading. In this test, the specimen is typically subjected to cyclic tension-tension loading to simulate the fatigue loading conditions that the material may experience in actual applications. Conventional wind turbine blade components, such as embedded threaded inserts, root punched connections, and pultruded plates, are typically tested using symmetrical specimens or by pairing asymmetrical specimens to form symmetrical structures. This eliminates lateral loads on the fatigue testing machine's actuator.

[0003] When the specimen has an asymmetric structure, dual-specimen testing cannot be performed due to the limitations of the rated load of some fatigue testing machines. If a single specimen is used for testing, the influence of the lateral load on the actuator of the fatigue testing machine cannot be eliminated, resulting in inaccurate test results. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a wind turbine blade tensile fatigue test fixture to effectively solve the problem that a single asymmetric structure specimen cannot be tested individually.

[0005] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] A wind turbine blade tensile fatigue test fixture comprises an upper connecting member, a lower connecting member, two guide assemblies and two adjustable clamping assemblies, wherein the two adjustable clamping assemblies are symmetrically arranged in an upper and lower position, and a sample placed therebetween is clamped by the two adjustable clamping assemblies, and the spacing between the clamping plates of each adjustable clamping assembly can be adjusted according to the thickness of the sample, wherein the top of the adjustable clamping assembly located at the top is hinged to the bottom of the upper connecting member, and the top of the upper connecting member is connected to the actuator of a fatigue testing machine, and the bottom of the adjustable clamping assembly located at the bottom is hinged to the top of the lower connecting member, and the bottom of the lower connecting member is connected to the base of the fatigue testing machine, and the two guide assemblies are symmetrically arranged on the two sides of the upper connecting member, and the guide wheels thereof can be attached to the guide plate of the fatigue testing machine, thereby eliminating the lateral load on the actuator.

[0007] Furthermore, the upper connecting part includes an articulated support, a connecting bolt and a locking ring. The top of the articulated support is connected to a connecting bolt for connecting to the actuator of the fatigue testing machine. The outer peripheral surface of the connecting bolt is threadedly connected to a locking ring for locking the connecting bolt. Two guide assemblies are symmetrically arranged on the two side surfaces of the articulated support.

[0008] Furthermore, the lower connecting member includes a bottom flange, the bottom of which is connected to the base of the fatigue testing machine, and the top of which is hinged to the bottom of the adjustable clamping assembly located below.

[0009] Furthermore, the adjustable clamping assembly includes an articulated flange, a T-slot plate, a slider, a stud bolt and two clamping plates, one end of the articulated flange is hinged to the articulated support of the upper connecting member or the bottom flange of the lower connecting member through a pin shaft, and the other end is fixed to one side surface of the T-slot plate by a bolt, and two T-slots are formed on the other side surface of the T-slot plate, each T-slot is provided with a scale, and two sliders are slidably installed in each T-slot, each slider is connected to a stud bolt, and each clamping plate is installed on the T-slot plate by two stud bolts located on different T-slots, and the slider is moved in the T-slot to adjust the distance between the two clamping plates, and a plurality of mounting holes for mounting specimens of different sizes are processed on the clamping plate.

[0010] Furthermore, the guide assembly includes a guide support, two guide shafts, two adjusting bolts and multiple guide wheels. The guide support is fixed to the side of the hinged support of the upper connecting member by bolts, and two waist-shaped holes are formed thereon for installing two guide shafts respectively. The guide support and the guide shaft are both formed with threaded holes for installing the adjusting bolts, and the threaded holes on the guide support are arranged perpendicular to the center lines of the waist-shaped holes. The guide shafts are installed in the corresponding waist-shaped holes, and guide wheels are installed at both ends of the guide shafts through bearings. The adjusting bolts are screwed into the threaded holes of the guide support and the guide shaft in turn. The guide shaft is moved in the waist-shaped hole by rotating the adjusting bolts, thereby adjusting the distance between the guide wheel and the guide plate.

[0011] A wind turbine blade tension fatigue test fixture comprises an upper connecting member, a lower connecting member, two guide assemblies, an adjustable loading assembly and an adjustable clamping assembly, the adjustable loading assembly and the adjustable clamping assembly are symmetrically arranged in the upper and lower parts, the sample is placed between the adjustable loading assembly and the adjustable clamping assembly, and one end of the sample is abutted against the adjustable loading assembly, and the other end is clamped by the clamping plate of the adjustable clamping assembly, and the clamping plate spacing of the adjustable clamping assembly can be adjusted according to the thickness of the sample, the top of the adjustable loading assembly is hinged to the bottom of the upper connecting member, the top of the upper connecting member is connected to the actuator of the fatigue testing machine, the bottom of the adjustable clamping assembly is hinged to the top of the lower connecting member, and the bottom of the lower connecting member is connected to the base of the fatigue testing machine, the two guide assemblies are symmetrically arranged on the two sides of the upper connecting member, and the guide wheels thereof can be attached to the guide plate of the fatigue testing machine, thereby eliminating the lateral load on the actuator.

[0012] Furthermore, the upper connecting member includes an articulated support, a connecting bolt and a locking ring. The top of the articulated support is connected to a connecting bolt for connecting to the actuator of the fatigue testing machine. The outer peripheral surface of the connecting bolt is threadedly connected to a locking ring for locking the connecting bolt. Two guide assemblies are symmetrically arranged on both sides of the articulated support; the lower connecting member includes a bottom flange, the bottom of the bottom flange is connected to the base of the fatigue testing machine, and the top of the bottom flange is hinged to the bottom of the adjustable clamping assembly located below.

[0013] Furthermore, the adjustable loading assembly includes an articulated flange, a T-slot plate, a slider, a stud bolt and a loading plate, one end of the articulated flange is hinged to the articulated support of the upper connecting member through a pin shaft, and the other end is fixed to one side surface of the T-slot plate by a bolt, two T-slots are formed on the other side surface of the T-slot plate, a scale is provided next to each T-slot, and two sliders are slidably installed in each T-slot, each slider is connected to a stud bolt, and the loading plate is installed on the T-slot plate by the stud bolt, and the position of the loading plate is adjusted by moving the slider in the T-slot.

[0014] Furthermore, the adjustable clamping assembly includes a hinged flange, a T-slot plate, a slider, a stud bolt and two clamping plates, one end of the hinged flange is hinged to the bottom flange of the lower connecting member through a pin shaft, and the other end is fixed to one side surface of the T-slot plate by a bolt, and two T-slots are formed on the other side surface of the T-slot plate, each T-slot is provided with a scale, and two sliders are slidably installed in each T-slot, each slider is connected to a stud bolt, and each clamping plate is installed on the T-slot plate by two stud bolts located on different T-slots, and the slider is moved in the T-slot to adjust the distance between the two clamping plates, and a plurality of mounting holes for mounting specimens of different sizes are processed on the clamping plate.

[0015] Furthermore, the guide assembly includes a guide support, two guide shafts, two adjusting bolts and multiple guide wheels. The guide support is fixed to the side of the hinged support of the upper connecting member by bolts, and two waist-shaped holes are formed thereon for installing two guide shafts respectively. The guide support and the guide shaft are both formed with threaded holes for installing the adjusting bolts, and the threaded holes on the guide support are arranged perpendicular to the center lines of the waist-shaped holes. The guide shafts are installed in the corresponding waist-shaped holes, and guide wheels are installed at both ends of the guide shafts through bearings. The adjusting bolts are screwed into the threaded holes of the guide support and the guide shaft in turn. The guide shaft is moved in the waist-shaped hole by rotating the adjusting bolts, thereby adjusting the distance between the guide wheel and the guide plate.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] 1. The tooling structure of the utility model is simple and easy to operate. When an asymmetric specimen is used and the load capacity of the fatigue testing machine does not meet the requirements of a double-specimen test, a single specimen can be used to complete the tensile fatigue test.

[0018] 2. The tooling of the utility model can be suitable for specimens of different thicknesses through the T-slot design, and can also adjust the eccentric distance of the specimen to achieve eccentric tensile fatigue testing of the specimen.

[0019] 3. The tooling of the present invention can eliminate the lateral load on the actuator of the fatigue testing machine through the guide assembly, thereby preventing the actuator from being damaged by the test load. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the three-dimensional structure of the test tool of Example 1 Figure 1 .

[0021] Figure 2 Schematic diagram of the three-dimensional structure of the test tool of Example 1 Figure 2 .

[0022] Figure 3 Schematic diagram of the structure of the T-slot plate Figure 1 .

[0023] Figure 4 Schematic diagram of the structure of the T-slot plate Figure 2 .

[0024] Figure 5 Schematic diagram of the structure of the splint.

[0025] Figure 6 Schematic diagram of the structure of the guide component.

[0026] Figure 7 Schematic diagram of the structure of the guide support.

[0027] Figure 8 Schematic diagram of the guide shaft structure.

[0028] Figure 9 Schematic diagram of the three-dimensional structure of the test tooling of Example 2 Figure 1 .

[0029] Figure 10 Schematic diagram of the three-dimensional structure of the test tooling of Example 2 Figure 2 . DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Example 1:

[0032] like Figures 1 to 2 As shown, this embodiment provides a wind turbine blade tensile fatigue test fixture, which is mainly used for testing plate specimens, including an upper connecting member 1, a lower connecting member 2, two guide assemblies 3 and an adjustable clamping assembly 4 and an adjustable clamping assembly 5. The adjustable clamping assembly 4 and the adjustable clamping assembly 5 are symmetrically arranged in an upper and lower manner. The sample 7 placed between the two adjustable clamping assemblies is clamped, and the spacing between the clamping plates 505 of each adjustable clamping assembly can be adjusted according to the thickness of the sample. At the same time, the thickness of the sample can be adjusted by adjusting the clamping plates 505. 5 is positioned so as to adjust the eccentric distance of the specimen to meet the requirements of eccentric fatigue testing, wherein the top of the adjustable clamping assembly 4 is hinged to the bottom of the upper connecting member 1, the top of the upper connecting member 1 is connected to the actuator of the fatigue testing machine, the bottom of the adjustable clamping assembly 5 is hinged to the top of the lower connecting member 2, the bottom of the lower connecting member 2 is connected to the base of the fatigue testing machine, and the two guide assemblies 3 are symmetrically arranged on the two sides of the upper connecting member 1, and the guide wheels 304 thereof can be attached to the guide plate of the fatigue testing machine, thereby eliminating the lateral load on the actuator.

[0033] Specifically, the upper connecting member 1 includes an articulated support 101, a connecting bolt 102 and a locking ring 103. The top of the articulated support 101 is connected to a connecting bolt 102 for connecting to the actuator of the fatigue testing machine. The outer peripheral surface of the connecting bolt 102 is threadedly connected to a locking ring 103 for locking the connecting bolt 102. The two guide assemblies 3 are symmetrically arranged on the two side surfaces of the articulated support 101.

[0034] Specifically, the lower connecting member 2 includes a bottom flange, the bottom of which is connected to the base of the fatigue testing machine, and the top of which is hinged to the bottom of the adjustable clamping assembly 5 through a pin 201 .

[0035] like Figures 3 to 5As shown, the adjustable clamping assembly 5 and the adjustable clamping assembly 4 have the same structure, both including an articulated flange 501, a T-slot plate 502, a slider (not shown in the figure), a stud bolt 504 and two clamping plates 505. One end of the articulated flange 501 is hinged to the articulated support 101 of the upper connecting member 1 or the bottom flange of the lower connecting member 2 through a pin, and the other end is fixed to one side of the T-slot plate 502 by bolts. Two T-slots 5021 are formed on the other side of the T-slot plate 502. A scale 503 is provided next to each T-slot 5021 for measuring the eccentric distance of the sample, and Two sliders are slidably installed in each T-slot 5021, and each slider is connected to a stud bolt 504. Each clamping plate 505 is installed on the T-slot plate 502 through two stud bolts 504 located on different T-slots 5021, and a plurality of mounting holes for mounting specimens of different sizes are processed on the clamping plate 505. The slider is moved in the T-slot 5021 to adjust the distance between the two clamping plates 505 to accommodate the installation of specimens of different thicknesses. At the same time, the eccentric distance of the specimen can also be adjusted by moving the slider in the T-slot 5021 to realize eccentric tensile fatigue testing of the specimen.

[0036] like Figures 6 to 8 As shown, the guide assembly 3 includes a guide support 301, two guide shafts 302, two adjusting bolts 303 and multiple guide wheels 304. The guide support 301 is fixed to the side of the hinged support 101 by bolts, and two waist-shaped holes 3011 are formed thereon for installing the two guide shafts 302 respectively. Threaded holes for installing the adjusting bolts 303 are formed on the guide support 301 and the guide shaft 302, and the threaded holes 3012 on the guide support 301 are arranged perpendicular to the center line of the waist-shaped holes. The guide shafts 302 are installed in the corresponding waist-shaped holes, and guide wheels 304 are installed at both ends of the guide shafts 302 through bearings. The adjusting bolts 303 are screwed into the threaded holes of the guide support 301 and the guide shaft 302 in turn to fix the guide shafts. At the same time, the guide shaft 302 is moved in the waist-shaped holes by rotating the adjusting bolts 303, thereby adjusting the distance between the guide wheels 304 and the guide plate.

[0037] In this embodiment, the bolts of the above-mentioned parts can be pre-tightened using a hydraulic tensioner to achieve precise control of the pre-tightening force and improve the test accuracy.

[0038] Example 2:

[0039] like Figures 9 and 10As shown, this embodiment provides a wind turbine blade tensile fatigue test fixture, which is mainly used for testing screw sleeve specimens. The difference between this embodiment and Example 1 is that the adjustable clamping assembly 4 located above is replaced by an adjustable loading assembly 6, and the adjustable loading assembly 6 and the adjustable clamping assembly 5 are symmetrically arranged in the upper and lower directions. The screw sleeve specimen 8 is placed between the adjustable loading assembly 6 and the adjustable clamping assembly 5, and one end of it is abutted against the adjustable loading assembly 6, and the other end is clamped by the clamping plate 505 of the adjustable clamping assembly 5.

[0040] Specifically, the adjustable loading assembly 6 includes an articulated flange 501, a T-slot plate 502, a slider, a stud bolt 504 and a loading plate 601. One end of the articulated flange 501 is hinged to the articulated support 101 through a pin, and the other end is fixed to one side surface of the T-slot plate 502 by a bolt. Two T-slots 5021 are formed on the other side surface of the T-slot plate 502. A scale is provided next to each T-slot 5021, and two sliders are slidably installed in each T-slot 5021. Each slider is connected to a stud bolt 504. The loading plate 601 is installed on the T-slot plate 502 through the stud bolt 504. The slider is moved in the T-slot 5021 to adjust the position of the loading plate 601, thereby adjusting the eccentric distance of the screw sleeve specimen 8 to achieve eccentric tensile fatigue testing of the specimen.

[0041] The above is only a preferred embodiment of the present utility model patent, but the protection scope of the present utility model patent is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present utility model patent based on the technical solution and the utility model patent concept of the present utility model patent, which falls within the protection scope of the present utility model patent.

Claims

1. A wind turbine blade fatigue test tool, characterized by: It includes an upper connecting member, a lower connecting member, two guide assemblies and two adjustable clamping assemblies. The two adjustable clamping assemblies are symmetrically arranged in the upper and lower parts. The sample placed between the two is clamped by the two adjustable clamping assemblies, and the spacing between the clamping plates of each adjustable clamping assembly can be adjusted according to the thickness of the sample. The top of the adjustable clamping assembly located above is hinged to the bottom of the upper connecting member, and the top of the upper connecting member is connected to the actuator of the fatigue testing machine. The bottom of the adjustable clamping assembly located below is hinged to the top of the lower connecting member, and the bottom of the lower connecting member is connected to the base of the fatigue testing machine. The two guide assemblies are symmetrically arranged on both sides of the upper connecting member, and the guide wheels thereof can be attached to the guide plate of the fatigue testing machine, thereby eliminating the lateral load on the actuator.

2. The wind turbine blade tensile fatigue test fixture according to claim 1, characterized in that: The upper connecting part includes an articulated support, a connecting bolt and a locking ring. The top of the articulated support is connected to a connecting bolt for connecting to the actuator of the fatigue testing machine. The outer peripheral surface of the connecting bolt is threadedly connected to a locking ring for locking the connecting bolt. Two guide assemblies are symmetrically arranged on the two side surfaces of the articulated support.

3. The wind turbine blade tensile fatigue test fixture according to claim 1, characterized in that: The lower connecting member comprises a bottom flange, the bottom of which is connected to the base of the fatigue testing machine, and the top of which is hinged to the bottom of the adjustable clamping assembly located below.

4. The wind turbine blade tensile fatigue test fixture according to claim 1, characterized in that: The adjustable clamping assembly includes an articulated flange, a T-slot plate, a slider, a stud bolt and two clamping plates, one end of the articulated flange is hinged to the articulated support of the upper connecting member or the bottom flange of the lower connecting member through a pin shaft, and the other end is fixed to one side surface of the T-slot plate by bolts, and two T-slots are formed on the other side surface of the T-slot plate, each T-slot is provided with a scale, and two sliders are slidably installed in each T-slot, each slider is connected to a stud bolt, and each clamping plate is installed on the T-slot plate by two stud bolts located on different T-slots, and the slider is moved in the T-slot to adjust the distance between the two clamping plates, and a plurality of mounting holes for mounting specimens of different sizes are processed on the clamping plate.

5. The wind turbine blade tensile fatigue test fixture according to claim 1, characterized in that: The guide assembly includes a guide support, two guide shafts, two adjusting bolts and multiple guide wheels. The guide support is fixed to the side of the hinged support of the upper connecting member by bolts, and has two waist-shaped holes for installing two guide shafts respectively. The guide support and the guide shaft are both formed with threaded holes for installing the adjusting bolts, and the threaded holes on the guide support are arranged perpendicular to the center lines of the waist-shaped holes. The guide shafts are installed in the corresponding waist-shaped holes, and guide wheels are installed at both ends of the guide shafts through bearings. The adjusting bolts are screwed into the threaded holes of the guide support and the guide shaft in turn. The guide shaft is moved in the waist-shaped hole by rotating the adjusting bolts, thereby adjusting the distance between the guide wheel and the guide plate.

6. A wind turbine blade fatigue test tool, characterized by: It includes an upper connecting piece, a lower connecting piece, two guide assemblies, an adjustable loading assembly and an adjustable clamping assembly. The adjustable loading assembly and the adjustable clamping assembly are symmetrically arranged in the upper and lower parts. The specimen is placed between the adjustable loading assembly and the adjustable clamping assembly, and one end of the specimen is pressed against the adjustable loading assembly, and the other end is clamped by the clamping plate of the adjustable clamping assembly. The spacing between the clamping plates of the adjustable clamping assembly can be adjusted according to the thickness of the specimen. The top of the adjustable loading assembly is hinged to the bottom of the upper connecting piece, and the top of the upper connecting piece is connected to the actuator of the fatigue testing machine. The bottom of the adjustable clamping assembly is hinged to the top of the lower connecting piece, and the bottom of the lower connecting piece is connected to the base of the fatigue testing machine. The two guide assemblies are symmetrically arranged on the two sides of the upper connecting piece, and the guide wheels thereof can be attached to the guide plate of the fatigue testing machine, thereby eliminating the lateral load on the actuator.

7. The wind turbine blade tensile fatigue test fixture according to claim 6, characterized in that: The upper connecting part includes an articulated support, a connecting bolt and a locking ring. The top of the articulated support is connected to a connecting bolt for connecting to the actuator of the fatigue testing machine. The outer peripheral surface of the connecting bolt is threadedly connected to a locking ring for locking the connecting bolt. Two guide assemblies are symmetrically arranged on the two side surfaces of the articulated support; the lower connecting part includes a bottom flange, the bottom of the bottom flange is connected to the base of the fatigue testing machine, and the top of the bottom flange is hinged to the bottom of the adjustable clamping assembly located below.

8. The wind turbine blade tensile fatigue test fixture according to claim 6, characterized in that: The adjustable loading assembly includes an articulated flange, a T-slot plate, a slider, a stud bolt and a loading plate. One end of the articulated flange is hinged to the articulated support of the upper connecting member through a pin shaft, and the other end is fixed to one side surface of the T-slot plate by a bolt. Two T-slots are formed on the other side surface of the T-slot plate, and a scale is provided next to each T-slot. Two sliders are slidably installed in each T-slot, and each slider is connected to a stud bolt. The loading plate is installed on the T-slot plate by the stud bolt, and the position of the loading plate is adjusted by moving the slider in the T-slot.

9. The wind turbine blade tensile fatigue test fixture according to claim 6, characterized in that: The adjustable clamping assembly includes a hinged flange, a T-slot plate, a slider, a stud bolt and two clamping plates, one end of the hinged flange is hinged to the bottom flange of the lower connecting member through a pin shaft, and the other end is fixed to one side surface of the T-slot plate by a bolt, and two T-slots are formed on the other side surface of the T-slot plate, each T-slot is provided with a scale, and two sliders are slidably installed in each T-slot, each slider is connected to a stud bolt, and each clamping plate is installed on the T-slot plate by two stud bolts located on different T-slots, and the slider is moved in the T-slot to adjust the distance between the two clamping plates, and a plurality of mounting holes for mounting specimens of different sizes are processed on the clamping plate.

10. The wind turbine blade tensile fatigue test fixture according to claim 6, characterized in that: The guide assembly includes a guide support, two guide shafts, two adjusting bolts and multiple guide wheels. The guide support is fixed to the side of the hinged support of the upper connecting member by bolts, and has two waist-shaped holes for installing two guide shafts respectively. The guide support and the guide shaft are both formed with threaded holes for installing the adjusting bolts, and the threaded holes on the guide support are arranged perpendicular to the center lines of the waist-shaped holes. The guide shafts are installed in the corresponding waist-shaped holes, and guide wheels are installed at both ends of the guide shafts through bearings. The adjusting bolts are screwed into the threaded holes of the guide support and the guide shaft in turn. The guide shaft is moved in the waist-shaped hole by rotating the adjusting bolts, thereby adjusting the distance between the guide wheel and the guide plate.

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