Blade root embedded part testing tool and testing equipment

Abstract

The invention relates to the field of wind power blades, and discloses a blade root embedded part testing tool and testing device.The blade root embedded part testing tool comprises an unbalance loading connecting piece, the unbalance loading connecting piece comprises a base part and an extending part, the base part is provided with at least one pair of first mounting positions, and the orthographic projection of the center line of the extending part on the base part is located between each pair of first mounting positions; the center line of the stretching connecting piece and the center line of the extending part are collinear, the stretching connecting piece comprises a first connecting part and a second connecting part, and the first connecting part is provided with a second mounting position corresponding to the first mounting position. According to the blade root embedded part testing tool and testing equipment, the problem that the testing result of an existing testing device is not accurate is solved, a first mounting position is eccentrically arranged relative to an extending part, and a second mounting position is eccentrically arranged relative to a second connecting part; therefore, eccentric loads can be applied to the upper end and the lower end of each tested blade root embedded part and conform to the actual working condition, and the test result is more accurate.

Description

Technical Field

[0001] The present application relates to the field of wind turbine blades, and in particular to a blade root embedded part testing tool and testing equipment. Background Art

[0002] As an important clean energy, wind power generation is developing more and more widely. As an important part of wind turbines, wind turbine blades include blade roots, blade bodies and blade tips. Among them, the blade roots are located at the root of wind turbine blades and are the key part of the connection between the blades and the hub of wind turbine generator sets. The blade roots and the hub are connected by embedded parts. The embedded parts are pre-embedded in the blade roots during the manufacturing process of wind turbine blades, and usually include shell structures, embedded bolt sleeves, blocks inserted between bolt sleeves, and wedge blocks. The embedded parts provide the connection point between the blades and the hub to ensure that the blades can remain stable when rotating at high speed and under wind force, while preventing stress concentration, improving the connection performance of the roots of wind turbine blades, and avoiding the risk of blades loosening and falling off.

[0003] In order to ensure the connection stability of the embedded bolt sleeves in the embedded parts, the embedded parts need to be tested, such as static test, pull-out test, etc. The existing test tooling cannot perform accurate tensile fatigue tests on embedded parts arranged in pairs. Summary of the invention

[0004] The embodiments of the present application provide a blade root embedded part testing tool and testing equipment, which can make the testing process closer to the actual use conditions and make the test results more accurate.

[0005] On the one hand, an embodiment of the present application provides a blade root embedded part testing tool, comprising:

[0006] A first connection assembly, the first connection assembly includes an off-load connection member, the off-load connection member includes a base and an extension, the base includes a first surface and a second surface opposite to each other, the extension is protrudingly arranged on the second surface, the base is provided with at least one pair of first mounting positions, each pair of the first mounting positions is arranged along a first direction, and an orthographic projection of a center line of the extension on the base is located between each pair of the first mounting positions;

[0007] a second connection assembly, the second connection assembly comprising a stretching connection member, the center line of the stretching connection member being arranged colinearly with the center line of the extension portion, the stretching connection member comprising a first connection portion and a second connection portion arranged along a second direction, the first connection portion being provided with a second mounting position corresponding to the first mounting position, and each pair of the second mounting positions being respectively arranged on both sides of the center line of the stretching connection member;

[0008] The first mounting position can be connected to the bolt sleeve end of the tested blade root embedded part, the second mounting position can be connected to the fixed end opposite to the bolt sleeve end of the tested blade root embedded part, and the extension part and the second connecting part connect the two ends of the testing machine.

[0009] According to the blade root embedded part test tool provided in an embodiment of the present application, the base is provided with at least two pairs of the first mounting positions along the third direction, and in the first direction, the extension portion is placed in the middle of the base.

[0010] According to the blade root embedded part test tool provided in the embodiment of the present application, the first mounting position includes one or more of a first mounting hole, a threaded column and a buckle.

[0011] According to the blade root embedded part test fixture provided in an embodiment of the present application, the extension part is provided with a first ball joint assembly, the second connecting part is provided with a second ball joint assembly, the extension part is connected to one end of the testing machine through the first ball joint assembly, and the second connecting part is connected to the other end of the testing machine through the second ball joint assembly.

[0012] According to the blade root embedded part test fixture provided in an embodiment of the present application, the first ball joint assembly includes a ball pair structure, and / or the second ball joint assembly includes a ball pair structure.

[0013] According to the blade root embedded part test fixture provided in the embodiment of the present application, the first ball joint assembly includes a joint bearing, the first connecting assembly also includes a first double-ear connecting member and a first connecting shaft, the first double-ear connecting member includes a first main plate, a first ear plate and a second ear plate, the first main plate includes a third surface and a fourth surface relative to each other, the first ear plate and the second ear plate are arranged at intervals on the third surface, the first main plate can be connected to the testing machine, and the first ear plate and the second ear plate are provided with a first ear hole; the first ball joint assembly is placed between the first ear plate and the second ear plate, and the first connecting shaft passes through the first ball joint assembly and the first ear hole.

[0014] According to the blade root embedded part test fixture provided in the embodiment of the present application, the second ball joint structure includes a joint bearing; the second connecting assembly also includes a second double-ear connecting member and a second connecting shaft, the second double-ear connecting member includes a second main plate, a third ear plate and a fourth ear plate, the second main plate includes a fifth surface and a sixth surface relative to each other, the third ear plate and the fourth ear plate are arranged at intervals on the fifth surface, the second main plate can be connected to the testing machine, and the third ear plate and the fourth ear plate are provided with a second ear hole; the second ball joint structure is placed between the third ear plate and the fourth ear plate, and the second connecting shaft passes through the second ball joint structure and the second ear hole.

[0015] According to the blade root embedded part test fixture provided in the embodiment of the present application, the stretch connector further comprises a stretch plate, a guard plate and a first fastener, a portion of the stretch plate along the second direction forms the first connection portion, and another portion and the guard plate form the second connection portion, along the first direction, the guard plate is placed on both sides of the stretch plate, the guard plate and the stretch plate form the second installation position, and the center line of the stretch plate is collinearly arranged with the center line of the extension portion;

[0016] The guard plate is provided with a second mounting hole, the stretch plate is provided with a third mounting hole at a position corresponding to the second mounting hole, and the first fastener passes through the second mounting hole, the fixed end of the tested blade root embedded part and the third mounting hole.

[0017] The blade root embedded part test tool provided in an embodiment of the present application further includes a third connecting component, which is placed between the first connecting component and the second connecting component along the second direction, and the third connecting component includes at least one pair of third mounting positions, and the third mounting positions are connected to equal-cross-sectional areas of the tested blade root embedded parts adjacent to each other along the first direction, and the third mounting positions are arranged corresponding to the second mounting positions.

[0018] According to the blade root embedded part test fixture provided in an embodiment of the present application, the third connection assembly at least includes a first connection plate group, a second connection plate group, a first connection rod group and a second connection rod group, the first connection plate of the first connection plate group is placed on both sides of an adjacent equal-section area of ​​the tested blade root embedded part, and the second connection plate of the second connection plate group is placed on both sides of an adjacent equal-section area of ​​another tested blade root embedded part;

[0019] The connecting rods of the first connecting rod group and the second connecting rod group both penetrate and connect the first connecting plate group and the second connecting plate group, and the two tested blade root embedded parts are placed between the first connecting rod group and the second connecting rod group.

[0020] The blade root embedded part testing tool provided according to the embodiment of the present application further includes a force measuring assembly, the force measuring assembly includes at least one pair of force measuring devices, and the force measuring devices are arranged between the first mounting position and the tested blade root embedded part.

[0021] On the other hand, an embodiment of the present application further provides a testing device, including a testing machine and the above-mentioned blade root embedded part testing fixture, wherein the extension portion and the second connecting portion of the blade root embedded part testing fixture connect two ends of the testing machine.

[0022] The blade root embedded parts test fixture and test equipment of the embodiment of the present application are provided with at least one pair of first mounting positions at the base, and the orthographic projection of the center line of the extension part on the base is located between the pair of first mounting positions; to achieve an eccentric setting of the first mounting position relative to the extension part, the center line of the stretching connector is colinearly arranged with the center line of the extension part, the stretching connector includes a first connecting part and a second connecting part, the first connecting part is provided with a second mounting position corresponding to the first mounting position, and each pair of second mounting positions is respectively arranged on both sides of the center line of the stretching connector, to achieve an eccentric setting of the second mounting position relative to the second connecting part, thereby achieving that at least one pair of tested blade root embedded parts can be tested at the same time, and the upper and lower ends of each tested blade root embedded part are in an eccentric state and are subjected to eccentric loads, which is consistent with the actual working conditions, so that the test results are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 One of the front views of a blade root embedded part testing tool provided in some embodiments of the present application is shown;

[0025] Figure 2 A schematic diagram of an exemplary eccentric load connecting member structure is shown;

[0026] Figure 3 One of the top views of an example eccentric load connection is shown;

[0027] Figure 4 Show Figure 3 Cross-sectional view along AA direction;

[0028] Figure 5 A second top view of another example of an eccentric load connecting member is shown;

[0029] Figure 6 The overall structural schematic diagram of the blade root embedded part testing tooling provided in some other embodiments of the present application is shown;

[0030] Figure 7 The second front view of the blade root embedded part testing tool provided by other embodiments of the present application is shown;

[0031] Figure 8 A bottom view of a blade root embedded part testing tool provided in some other embodiments of the present application is shown;

[0032] Fig. 9 The schematic diagram of the structure of the first double-ear connector provided in some other embodiments of the present application is shown;

[0033] Fig.10 The schematic diagram of the stretch plate structure provided by some embodiments of the present application is shown;

[0034] Fig.11 The schematic diagram of the guard plate structure provided by some embodiments of the present application is shown;

[0035] Fig.12 A schematic diagram of the structure of a third connection component provided in some embodiments of the present application is shown;

[0036] Fig.13 The main views provided in some embodiments of the present application are shown.

[0037] Reference numerals:

[0038] 100: first connecting component; 101: first ball joint component; 110: eccentric load connecting member; 111: base; 112: extension; 113: first mounting hole; 115: first surface; 116: second surface; 117: reinforcing rib; 120: first double-ear connecting member; 130: first connecting shaft; 140: first mounting position; 121: first main plate; 122: first ear plate; 123: second ear plate; 124: first ear hole; 102: circular ring structure; 103: semicircular ring; 104: fixing plate; 105: first assembly; 106: second assembly; 107: bearing hole;

[0039] 200: second connection assembly; 210: stretching connection piece; 201: first connection part; 202: second connection part; 203: second ball joint assembly; 204: second mounting position; 211: stretching plate; 212: guard plate; 213: third mounting hole; 230: second double-ear connection piece; 221: second mounting hole; 240: second connecting shaft;

[0040] 300: third connecting assembly; 301: third mounting position; 310: first connecting plate group; 311: first connecting plate; 320: second connecting plate group; 321: second connecting plate; 330: first connecting rod group; 331: first connecting rod; 340: second connecting rod group; 341: second connecting rod;

[0041] 400: embedded part of blade root to be tested; 401: bolt sleeve end; 402: fixed end; 410: embedded area; 420: uniform cross-sectional area; 421: uniform cross-sectional transition area; 422: arc-shaped transition area; 423: fixed area; 500: force measuring component. DETAILED DESCRIPTION

[0042] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0044] As an important clean energy source, wind power generation is developing more and more widely. As an important part of the wind turbine, the blade is connected to the wind turbine hub through the blade root bolt. In the design of large blade roots, the mainstream solution is the design of embedded bolt sleeves at the blade root. In order to verify the safety of the embedded blade root structure, it is usually necessary to verify its structural bearing capacity through tensile testing. The method of verifying the bearing capacity of the blade root through full-size blades has problems such as long testing cycle, high cost and insufficient verification. Therefore, the industry takes a part of the blade root structure according to the stress characteristics of the blade root structure and tests its bearing capacity through the blade root component structure.

[0045] The root embedded part of a wind turbine blade is a structural part embedded in the root of a wind turbine blade for connecting to a wind turbine. It mainly realizes the reliable connection between the wind turbine blade and the wind turbine through components such as embedded bolt sleeves, blocks inserted between bolt sleeves, and wedge blocks. The main function of the embedded part is to prevent stress concentration, improve the connection performance of the root of the wind turbine blade, and avoid the risk of the wind turbine blade loosening and falling off. There are multiple embedded bolt sleeves, which are arranged in the shell structure at intervals along the circumference of the root of the blade body. These bolt sleeves are used to install connecting bolts to achieve a fixed connection between the wind turbine blade and the wind turbine. The blocks inserted between bolt sleeves are arranged between two adjacent embedded bolt sleeves to enhance the overall strength and stability of the embedded parts. The wedge blocks correspond to multiple embedded bolt sleeves one by one, and respectively abut against the ends of the bolt sleeves. The design of the wedge blocks helps to disperse stress and improve the connection performance.

[0046] like Figure 1 As shown, the blade root embedded part includes an embedded area 410 and a uniform cross-section area 420 in sequence from the blade root to the blade tip, wherein the uniform cross-section area 420 also includes a uniform cross-section transition area 421, an arc-shaped transition area 422 and a fixed area 423 in sequence. The thickness of the uniform cross-section area 420 is consistent, and the width of the fixed area 423 is greater than the width of the uniform cross-section transition area 421. Therefore, the arc-shaped transition area 422 is used to transition the width of the uniform cross-section transition area 421 and the fixed area 423; the width of the uniform cross-section transition area 421 is consistent with the width of the embedded area 410. In addition, the blade root embedded area 410 also includes a bolt sleeve area and a wedge-shaped area in sequence, the thickness of the uniform cross-section area 420 is less than the thickness of the bolt sleeve area, and the thickness of the wedge-shaped area transitions the uniform cross-section area 420 and the bolt sleeve area.

[0047] In order to ensure the working stability of the blade root embedded parts, it is necessary to perform performance tests on the blade root embedded parts, such as tensile tests, fatigue tests with alternating loads, impact tests, etc., to determine the connection strength, fatigue life, impact resistance and other properties of the blade root embedded parts. Taking the tensile test as an example, most of the existing test devices are single-piece test fixtures, that is, only one blade root embedded part can be tested at a time, and the test efficiency is low. In addition, since most of the blade root embedded parts are not completely symmetrical, additional bending moments are inevitably introduced, which will generate lateral forces on the actuator of the test machine, thereby affecting the safety of the test machine and also having an adverse effect on the test results.

[0048] In order to solve the problems of the prior art, the embodiment of the present application provides a blade root embedded component test fixture and a test device. The blade root embedded component test fixture provided by the embodiment of the present application is first introduced below.

[0049] Figure 1 One of the front views of the blade root embedded part test fixture provided in some embodiments of the present application is shown, Figure 2 A schematic diagram of an exemplary eccentric load connecting member structure is shown. Figure 3 One of the top views of an example eccentric load connection is shown; Figure 4 Show Figure 3 Cross-sectional view along the AA direction.

[0050] like Figures 1 to 4As shown, the embodiment of the present application provides a blade root embedded component test fixture, including: a first connection assembly 100 and a second connection assembly 200, the first connection assembly 100 includes an eccentric load connection member 110, the eccentric load connection member 110 includes a base 111 and an extension 112, the base 111 includes a first surface 115 and a second surface 116 opposite to each other, the extension 112 is protrudingly arranged on the second surface 116, the base 111 is provided with at least one pair of first mounting positions 140, each pair of first mounting positions 140 is arranged along a first direction, and the orthographic projection of the center line of the extension 112 on the base 111 is located between each pair of first mounting positions 140; the second connection assembly 200 includes a tensile connection member 210 The center line of the tensile connector 210 is colinearly arranged with the center line of the extension portion 112. The tensile connector 210 includes a first connector 201 and a second connector 202 arranged along the second direction. The first connector 201 is provided with a second mounting position 204 corresponding to the first mounting position 140. Each pair of second mounting positions 204 are respectively placed on both sides of the center line of the tensile connector 210; wherein the first mounting position 140 can be connected to the bolt sleeve end 401 of the tested blade root embedded component 400, and the second mounting position 204 can be connected to the fixed end 402 opposite to the bolt sleeve end 401 of the tested blade root embedded component 400. The extension portion 112 and the second connector 202 connect the two ends of the testing machine.

[0051] Specifically, in an actual blade, the blade root is connected to the inner ring of the pitch bearing by bolts, and the inner ring of the pitch bearing and the outer ring of the pitch bearing transmit loads through bearing rollers, and there is an eccentric load. In order to improve the consistency of the test process with the actual working conditions, in an embodiment of the present application, at least one pair of tested blade root embedded parts 400 are connected between the first connecting component 100 and the second connecting component 200, and the tested blade root embedded parts 400 are arranged between the first connecting component 100 and the second connecting component 200 along the length direction. Specifically, the base 111 includes at least one pair of first mounting positions 140, and the first mounting position 140 is eccentrically arranged with the extension part 112. The first mounting position 140 is used for threaded connection with the bolt sleeve of the tested blade root embedded part 400. Therefore, the tested blade root embedded part 400 is eccentrically arranged with the extension part 112, and the extension part 112 is used to connect with one end of the test machine.

[0052] The number of the second installation positions 204 of the tensile connector 210 corresponds to the number of the first installation positions 140, and the position of the second installation position 204 is arranged opposite to the first installation position 140. The bolt sleeve of a tested blade root embedded part 400 is connected to the first installation position 140, and the fixed end 402 of the tested blade root embedded part 400 is connected to the second installation position 204. The two parallel tested blade root embedded parts 400 connected to a pair of first installation positions 140 and a pair of second installation positions 204, that is, the wedge-shaped areas of the two tested blade root embedded parts 400 are arranged back to back, and the two opposite surfaces of the two tested blade root embedded parts 400 are parallel, which is convenient for the installation of the blade root embedded part test fixture. The center line of the second connecting part 202 is placed on both sides of each pair of second installation positions 204, and the second connecting part 202 is used to connect to the other end of the test machine. The tested blade root embedded part 400 and the second connecting part 202 are eccentrically arranged. For example, the width of the extending portion 112 in the first direction is smaller than that of the base portion 111 , and the width of the second connecting portion 202 in the first direction is smaller than or equal to that of the first connecting portion 201 .

[0053] The testing machine can be a tensile setting, and the testing machine provides a tensile force in the opposite direction of the center line of the extension portion 112 and the second connection portion 202, so that each tested blade root embedded part 400 is under an eccentric load, and each tested blade root embedded part 400 is subjected to the same tensile force. The first direction is perpendicular to the second direction, the first direction is the width direction of the tested blade root embedded part 400, and the second direction is the length direction of the tested blade root embedded part 400.

[0054] Further, in some embodiments of the present application, the first mounting position 140 includes one or more of the first mounting hole 113, a threaded column, and a buckle. When the first mounting position 140 is provided with a threaded column, the threaded column is installed on the second surface 116 of the base, and the external thread of the threaded column is matched and connected with the internal thread of the threaded sleeve of the tested blade root embedded component 400.

[0055] Or, if Figure 2 As shown, when the first mounting position 140 is provided with the first mounting hole 113, the first mounting hole 113 penetrates the base, and the bolt penetrates the first mounting hole 113 and is connected with the internal thread of the threaded sleeve of the tested blade root embedded part 400, thereby connecting the eccentric load connector 110. The center distance of a pair of first mounting holes 113 is greater than the width of the extension part 112, and the extension part 112 and the base 111 are in an inverted T-shaped structure. The hole diameter of the first mounting hole 113 is slightly larger than the outer diameter of the connected bolt.

[0056] In addition, in order to improve the connection strength between the extension portion 112 and the base portion 111 , a reinforcing rib 117 is provided between the first surface 115 of the base portion 111 and the extension portion 112 , wherein the reinforcing rib 117 may be an arc-shaped transition.

[0057] Figure 5 A second top view of another example of an eccentric load connecting member is shown.

[0058] like Figure 5 As shown, in one embodiment of the present application, the base 111 is provided with at least two pairs of first mounting positions 140 along the third direction, and the extension 112 is placed in the middle of the base 111 in the first direction. In the third direction, the length of the extension 112 may be the same as the length of the base 111. For example, there is one connection position between the extension 112 and the test machine, and the position is placed in the middle of the base 111 along the third direction; or, there are multiple connection positions between the extension 112 and the test machine, and the multiple positions are arranged at intervals in the third direction of the extension 112. Among the multiple pairs of first mounting positions 140, some pairs of first mounting positions 140 may be provided with first mounting holes 113, and the other pairs of first mounting positions 140 may be provided with threaded columns. For example, the base 111 is provided with three pairs of first mounting positions 140 along the third direction, and each pair of first mounting positions 140 is arranged on both sides of the extension 112 along the first direction, so that each first mounting position 140 is arranged with an offset load relative to the extension 112.

[0059] The third direction is perpendicular to the first direction and the second direction. For example, the first direction is opposite to the X-axis, the second direction is the Y-axis direction, and the third direction is the Z-axis direction.

[0060] The prior art also has a tooling that can test two blade root embedded parts at the same time, but the upper and lower ends of the two blade root embedded parts are rigidly fixed to the testing machine, which introduces bending moments during the test process, making the test process not completely consistent with the actual working conditions, resulting in large deviations in the test results. Figure 1 and Figure 2 As shown, in another embodiment of the present application, the extension part 112 is provided with a first ball joint assembly 101, the second connection part 202 is provided with a second ball joint assembly 203, the extension part 112 is connected to one end of the test machine through the first ball joint assembly 101, and the second connection part 202 is connected to the other end of the test machine through the second ball joint assembly 203. The first connection assembly 100 and the second connection assembly 200 are connected to the test machine by a ball joint, and the bending load introduced by misalignment or asymmetry is reduced as much as possible during the stretching process, and only the tensile load is applied to the tested blade root embedded part 400, thereby improving the accuracy of the test.

[0061] For example, the first ball joint assembly 101 is arranged in the middle of the extension portion 112 in the third direction, and the second ball joint assembly 203 is arranged in the middle of the second connection portion 202. The ball joint assembly has the ability to rotate in multiple directions, thereby increasing the degree of freedom between the blade root embedded component test fixture and the test machine, and ensuring the eccentric load stretching of the tested blade root embedded component 400 along the center line direction of the extension portion 112.

[0062] Specifically, in a specific embodiment of the present application, the first ball joint assembly 101 includes a ball joint structure, and / or the second ball joint assembly 203 includes a ball joint structure. For example, the first ball joint assembly 101 is a ball joint structure, and the second ball joint assembly 203 can be a ball joint structure or a joint bearing; or, the first ball joint assembly 101 is a joint bearing, and the second ball joint assembly 203 is a ball joint structure or a joint bearing. The first connecting assembly 100 and the second connecting assembly 200 of the blade root embedded parts test fixture can be directly connected to the testing machine through a ball joint structure. The core of the ball joint is a spherical connector, which allows the two components to move relative to each other in three degrees of freedom (rotation of the X, Y, and Z axes).

[0063] Figure 6 The overall structure schematic diagram of the blade root embedded part test fixture provided by other embodiments of the present application is shown. Figure 7 The second front view of the blade root embedded part testing tool provided in some other embodiments of the present application is shown. Figure 8 FIG. 2 shows a bottom view of a blade root embedded component test fixture provided by other embodiments of the present application, such as Fig. 9 Schematic diagrams of the structure of the first dual-ear connector provided in other embodiments of the present application are shown.

[0064] like Figures 6 to 9 As shown, in an optional embodiment of the present application, the first ball joint assembly 101 includes a joint bearing, the first connecting assembly 100 also includes a first double-ear connecting piece 120 and a first connecting shaft 130, the first double-ear connecting piece 120 includes a first main plate 121, a first ear plate 122 and a second ear plate 123, the first main plate 121 includes a third surface and a fourth surface relative to each other, the first ear plate 122 and the second ear plate 123 are spaced apart on the third surface, the first main plate 121 can be connected to the testing machine, the first ear plate 122 and the second ear plate 123 are provided with a first ear hole 124; the first ball joint assembly 101 is placed between the first ear plate 122 and the second ear plate 123, and the first connecting shaft 130 passes through the first ball joint assembly 101 and the first ear hole 124.

[0065] That is to say, Figure 6 and Figure 7 As shown, the first connection assembly 100 includes an eccentric load connector 110, a first double-ear connector 120 and a first connection shaft 130. The eccentric load connector 110 and the first double-ear connector 120 are connected by a ball joint through a joint bearing and the first connection shaft 130, so that the first double-ear connector 120 is connected to the testing machine. In other words, the eccentric load connector 110 is connected by a ball joint with the testing machine through the first double-ear connector 120. Among them, the joint bearing includes a radial joint bearing, an angular contact joint bearing, a thrust joint bearing, a rod end joint bearing, etc.; the joint bearing can rotate and swing at any angle.

[0066] For example, Figure 4 As shown, the extension portion 112 forms a through hole, the axis of the through hole is perpendicular to the axis direction of the first mounting hole 113, the first ball joint assembly 101 is installed in the through hole, the first ball joint assembly 101 includes a circular ring structure 102, a semicircular ring 103, a first assembly 105 and a second assembly 106, the outer surface of the circular ring structure 102 is an outer spherical surface, and the inner surface of the circular ring structure 102 is a cylindrical hole; the inner surfaces of the semicircular ring 103, the first assembly 105 and the second assembly 106 form an outer spherical surface, which contacts and matches the outer spherical surface of the circular ring structure 102, and the outer surfaces of the semicircular ring 103, the first assembly 105 and the second assembly 106 match the through hole. The first assembly 105 and the second assembly 106 are placed on the side of the circular ring structure 102 close to the base, the semicircular ring 103 is placed on the side of the circular ring structure 102 away from the base, and the first assembly 105 and the second assembly 106 are arranged along the axis direction of the through hole. In addition, fixing plates 104 are installed on opposite sides of the spherical bearing, and the fixing plates 104 fix the spherical bearing on the base. The fixing plates 104 are provided with holes corresponding to the inner surface of the annular structure 102 for the penetration of the first connecting shaft 130. The distance between the axis of the cylindrical hole formed on the inner surface of the annular structure 102 and the side of the extension 112 away from the base is greater than 1.5 times the diameter of the cylindrical hole of the annular structure 102. The material of the spherical bearing is generally a heat-treated metal material.

[0067] Furthermore, in another optional embodiment of the present application, the second ball joint structure includes a joint bearing; the second connection assembly 200 also includes a second double-ear connector 230 and a second connecting shaft 240, the second double-ear connector 230 includes a second main plate, a third ear plate and a fourth ear plate, the second main plate includes a fifth surface and a sixth surface relative to each other, the third ear plate and the fourth ear plate are spaced apart on the fifth surface, the second main plate can be connected to the testing machine, and the third ear plate and the fourth ear plate are provided with a second ear hole; the second ball joint structure is placed between the third ear plate and the fourth ear plate, and the second connecting shaft 240 passes through the second ball joint structure and the second ear hole. The material of the first double-ear connector 120 and the second double-ear connector 230 is generally a heat-treated metal material.

[0068] That is to say, the second connecting assembly 200 includes a tensile connector 210, a second double-ear connector 230 and a second connecting shaft 240. The tensile connector 210 is connected to the second double-ear connector 230 via a joint bearing and the second connecting shaft 240. In other words, the tensile connector 210 is connected to the testing machine via a joint bearing, the second connecting shaft 240 and the second double-ear connector 230.

[0069] The joint bearing of the first ball joint structure has the same structure as the joint bearing of the second ball joint structure, which will not be described in detail here.

[0070] Fig.10 The schematic diagram of the stretch plate structure provided by some embodiments of the present application is shown. Fig.11 The following is a schematic diagram of the guard plate structure provided in some embodiments of the present application.

[0071] like Fig.10 and Fig.11 As shown, in other embodiments of the present application, the stretch connector 210 also includes a stretch plate 211, a guard plate 212 and a first fastener, a portion of the stretch plate 211 along the second direction forms a first connection portion 201, and the other portion forms a second connection portion 202 with the guard plate 212, along the first direction, the guard plate 212 is placed on both sides of the stretch plate 211, a second mounting position 204 is formed between the guard plate 212 and the stretch plate 211, and the center line of the stretch plate 211 is colinearly arranged with the center line of the extension portion 112; the guard plate 212 is provided with a second mounting hole 221, and a third mounting hole 213 is provided at a position corresponding to the second mounting hole 221 of the stretch plate 211, and the first fastener passes through the second mounting hole 221, the fixed end 402 of the tested blade root embedded part 400 and the third mounting hole 213.

[0072] Specifically, the stretching plate 211 and the guard plate 212 are both straight plates, the stretching plate 211 and the guard plate 212 are arranged in parallel, and the tested blade root embedded part 400 is connected between the stretching plate 211 and the guard plate 212. Among them, the stretching plate 211 is provided with a third mounting hole 213, and the fixed end 402 of the tested blade root embedded part 400 is also provided with a through hole. The first fastener penetrates the through hole of the tested blade root embedded part 400 and the third mounting hole 213 to connect the stretching plate 211 and the tested blade root embedded part 400. In order to avoid the first fastener including a screw and a nut, and to avoid the nut directly contacting the tested blade root embedded part 400 and causing damage to the tested blade root embedded part 400, a guard plate 212 is arranged between the nut and the tested blade root embedded part 400 to protect the tested blade root embedded part 400. Among them, the fixed end 402 of the tested blade root embedded part 400 is placed in the fixed area 423. The center distance of a pair of first mounting holes is equal to twice the distance from the center line of the bolt sleeve of the tested blade root embedded part 400 to the outer skin plus the thickness of the tensile plate 211 .

[0073] The guard plate 212 increases the heat contact area between the nut and the tested blade root embedded part 400, and prevents the nut from directly contacting the test piece and causing local failure. The material of the guard plate 212 is generally selected to have a modulus similar to that of the tested blade root embedded part 400. For the tested blade root embedded part 400 with a relatively large thickness, the guard plate 212 can also be made of metal.

[0074] When the first connection assembly 100 has multiple pairs of first installation positions 140, the second connection assembly 200 correspondingly has multiple pairs of second installation positions 204. The tensile connector 210 of the second connection assembly 200 extends along the third direction, and the tensile plate 211 and the guard plate 212 are connected to multiple pairs of tested blade root embedded parts 400.

[0075] Fig.12 The third connection component structure diagram provided in some embodiments of the present application is shown. Fig.13 The main views provided in some embodiments of the present application are shown.

[0076] In the prior art tensile test, the tested blade root embedded part 400 will produce obvious out-of-plane deformation at the fixed end. However, in the actual blade root, since the tested blade root embedded part 400 is placed in the cylindrical section of the blade root, there is lateral constraint, so the out-of-plane deformation is not obvious.

[0077] like Figure 1 , Fig.12 and Fig.13 As shown, in one embodiment of the present application, the blade root embedded component test fixture further includes a third connection component 300. Along the second direction, the third connection component 300 is placed between the first connection component 100 and the second connection component 200. The third connection component 300 includes at least one pair of third mounting positions 301. The third mounting positions 301 are connected to the equal-section regions 420 of the tested blade root embedded components 400 adjacent to each other along the first direction. The third mounting positions 301 are arranged corresponding to the second mounting positions 204. For example, the third connection component 300 can be installed in the equal-section transition region 421 of the equal-section region 420 of the tested blade root embedded component 400. The third connection component 300 can reduce the out-of-plane deformation of the tested blade root embedded component 400, ensure that the out-of-plane deformation is consistent with the out-of-plane deformation of the actual blade root embedded component, and avoid deformation of the tested blade root embedded component 400 during the test process.

[0078] Specifically, the third connecting assembly 300 connects the equal-section transition regions 421 of a pair of tested blade root embedded parts 400 to keep the relative positions of the pair of tested blade root embedded parts 400 unchanged during the test and reduce the out-of-plane deformation of each tested blade root embedded part 400.

[0079] like Fig.12As shown, in an embodiment of the present application, the third connecting assembly 300 includes at least a first connecting plate group 310, a second connecting plate group 320, a first connecting rod group 330 and a second connecting rod group 340, the first connecting plate 311 of the first connecting plate group 310 is placed on both sides of the equal-section area 420 of an adjacent tested blade root embedded part 400, and the second connecting plate 321 of the second connecting plate group 320 is placed on both sides of the equal-section area 420 of another adjacent tested blade root embedded part 400; the connecting rods of the first connecting rod group 330 and the second connecting rod group 340 both penetrate and connect the first connecting plate group 310 and the second connecting plate group 320, and the two tested blade root embedded parts 400 are placed between the first connecting rod group 330 and the second connecting rod group 340.

[0080] That is, the first connecting plate group 310 and the first connecting rod group 330 and the second connecting rod group 340 form a third installation position 301, and the second connecting plate group 320 and the first connecting rod group 330 and the second connecting rod group 340 form another third installation position 301. For example, the connecting plates in the first connecting plate group 310 are arranged in parallel, the connecting plates in the second connecting plate group 320 are arranged in parallel, and the first connecting plate 311 in the first connecting plate group 310 is arranged in parallel with the second connecting plate 321 in the second connecting plate group 320. The first connecting rod 331 of the first connecting rod group 330 and the second connecting rod 341 of the second connecting rod group 340 are arranged in parallel.

[0081] The connecting rods of the first connecting rod group 330 and the second connecting rod group 340 can be threaded rods or springs with appropriate stiffness. The connecting rods of the first connecting rod group 330 and the second connecting rod group 340 are generally an even number, and the tensile stiffness of the first connecting rod group 330 and the second connecting rod group 340 should be appropriate to ensure that the out-of-plane deformation in the tested blade root embedded part 400 is consistent with the out-of-plane deformation in the actual blade. The material of the first connecting plate group 310 and the second connecting plate group 320 is generally consistent with the material of the tested blade root embedded part 400 or a material with a similar modulus is selected. For a structure with a thicker sample, the first connecting plate group 310 and the second connecting plate group 320 can also be made of metal. The blade root and the blade root embedded part test fixture transmit loads through friction and bolt shear.

[0082] In addition, when the third connecting rod group has multiple pairs of third mounting positions 301, the first connecting plate group 310 and the second connecting plate group 320 extend along the third direction, and the number of the first connecting rod group 330 and the second connecting rod group 340 can be increased to form multiple pairs of third mounting positions 301 with the first connecting plate group 310 and the second connecting plate group 320. The multiple pairs of third mounting positions 301 are matched with the multiple pairs of first mounting positions 140 and the multiple pairs of second mounting positions 204.

[0083] Continue to refer Figure 6 and Figure 7 As shown, in some embodiments of the present application, the blade root embedded component test fixture further includes a force measuring assembly 500, and the force measuring assembly 500 includes at least one pair of force measuring devices, and the force measuring devices are arranged between the first installation position 140 and the tested blade root embedded component 400. For example, the force measuring device is a structure that can be installed on a bolt, such as a bolt preload force sensor, a tightening force measuring instrument, etc.

[0084] The force measuring device in the force measuring assembly 500 can obtain the preload force of the tested blade root embedded part 400, ensuring that the preload force of each tested blade root embedded part 400 is consistent. When the preload force and tension of each tested blade root embedded part 400 are the same, the tensile test result is more accurate.

[0085] Some embodiments of the present application further provide a testing device, including a testing machine and the blade root embedded part testing fixture of the above embodiment, wherein the extension portion 112 and the second connection portion 202 of the blade root embedded part testing fixture are respectively connected to two ends of the testing machine.

[0086] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A blade root embedded part testing tool, characterized in that: include: A first connection assembly, the first connection assembly includes an off-load connection member, the off-load connection member includes a base and an extension, the base includes a first surface and a second surface opposite to each other, the extension is protrudingly arranged on the second surface, the base is provided with at least one pair of first mounting positions, each pair of the first mounting positions is arranged along a first direction, and an orthographic projection of a center line of the extension on the base is located between each pair of the first mounting positions; a second connection assembly, the second connection assembly comprising a stretching connection member, the center line of the stretching connection member being arranged colinearly with the center line of the extension portion, the stretching connection member comprising a first connection portion and a second connection portion arranged along a second direction, the first connection portion being provided with a second mounting position corresponding to the first mounting position, and each pair of the second mounting positions being respectively arranged on both sides of the center line of the stretching connection member; The first mounting position can be connected to the bolt sleeve end of the tested blade root embedded part, the second mounting position can be connected to the fixed end opposite to the bolt sleeve end of the tested blade root embedded part, and the extension part and the second connecting part connect the two ends of the testing machine.

2. The blade root embedded part testing tool according to claim 1, characterized in that: The base is provided with at least two pairs of the first installation positions along the third direction, and in the first direction, the extension portion is located in the middle of the base.

3. The blade root embedded part testing tool according to claim 1, characterized in that: The first mounting position includes one or more of a first mounting hole, a threaded column and a buckle.

4. The blade root embedded part testing tool according to claim 1, characterized in that: The extension part is provided with a first ball joint assembly, and the second connection part is provided with a second ball joint assembly. The extension part is connected to one end of the testing machine through the first ball joint assembly, and the second connection part is connected to the other end of the testing machine through the second ball joint assembly.

5. The blade root embedded part testing tool according to claim 4, characterized in that: The first ball joint assembly includes a ball joint structure, and / or the second ball joint assembly includes a ball joint structure.

6. The blade root embedded part testing tool according to claim 4, characterized in that: The first ball joint assembly includes a joint bearing, the first connecting assembly also includes a first double-ear connecting piece and a first connecting shaft, the first double-ear connecting piece includes a first main plate, a first ear plate and a second ear plate, the first main plate includes a third surface and a fourth surface relative to each other, the first ear plate and the second ear plate are spaced apart on the third surface, the first main plate can be connected to the testing machine, the first ear plate and the second ear plate are provided with a first ear hole; the first ball joint assembly is placed between the first ear plate and the second ear plate, and the first connecting shaft passes through the first ball joint assembly and the first ear hole.

7. The blade root embedded part testing tool according to claim 6, characterized in that: The second ball joint structure includes a joint bearing; the second connecting assembly also includes a second double-ear connecting member and a second connecting shaft, the second double-ear connecting member includes a second main plate, a third ear plate and a fourth ear plate, the second main plate includes a fifth surface and a sixth surface relative to each other, the third ear plate and the fourth ear plate are spaced apart on the fifth surface, the second main plate can be connected to the testing machine, and the third ear plate and the fourth ear plate are provided with a second ear hole; the second ball joint structure is placed between the third ear plate and the fourth ear plate, and the second connecting shaft passes through the second ball joint structure and the second ear hole.

8. The blade root embedded part testing tool according to claim 1, characterized in that: The stretch connector also includes a stretch plate, a guard plate and a first fastener, a portion of the stretch plate along the second direction forms the first connection portion, and another portion and the guard plate form the second connection portion, along the first direction, the guard plate is placed on both sides of the stretch plate, the second installation position is formed between the guard plate and the stretch plate, and the center line of the stretch plate is collinear with the center line of the extension portion; The guard plate is provided with a second mounting hole, the stretch plate is provided with a third mounting hole at a position corresponding to the second mounting hole, and the first fastener passes through the second mounting hole, the fixed end of the tested blade root embedded part and the third mounting hole.

9. The blade root embedded part testing tool according to any one of claims 1 to 8, characterized in that: It also includes a third connecting component, which is placed between the first connecting component and the second connecting component along the second direction, and includes at least one pair of third mounting positions, which are connected to equal-section areas of the tested blade root embedded parts adjacent to each other along the first direction, and the third mounting positions are arranged corresponding to the second mounting positions.

10. The blade root embedded part testing tool according to claim 9, characterized in that: The third connection assembly at least includes a first connection plate group, a second connection plate group, a first connection rod group and a second connection rod group, wherein the first connection plates of the first connection plate group are placed on both sides of an adjacent equal-section area of ​​the tested blade root embedded part, and the second connection plates of the second connection plate group are placed on both sides of an adjacent equal-section area of ​​another tested blade root embedded part; The connecting rods of the first connecting rod group and the second connecting rod group both penetrate and connect the first connecting plate group and the second connecting plate group, and the two tested blade root embedded parts are placed between the first connecting rod group and the second connecting rod group.

11. The blade root embedded part testing tool according to any one of claims 1 to 8, characterized in that: It also includes a force measuring assembly, which includes at least one pair of force measuring devices, and the force measuring devices are arranged between the first installation position and the tested blade root embedded part.

12. A testing device, characterized in that: The invention comprises a testing machine and the blade root embedded component testing fixture according to any one of claims 1 to 11, wherein the extending portion and the second connecting portion of the blade root embedded component testing fixture connect two ends of the testing machine.

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