CN220270741U - A uniaxial fatigue testing device for wind turbine blades - Google Patents

Abstract

The utility model discloses a wind power blade fatigue testing device, which relates to the technical field of wind power blade fatigue testing. It includes a base, transitional connection parts, blades, blade clamps, hydraulic excitation, and the base is fixedly placed; the transitional connection parts are removably and fixedly connected to the base; the root of the blade and the transitional connection part are connected with bolts; the blade clamp is set on the blade outside; the blade clamp is connected to the hydraulic excitation through the transmission component, and the hydraulic excitation drives the blade to achieve reciprocating vibration; the blade clamp includes a fatigue loading component and a clamping component, the fatigue loading component is located on both sides of the clamping component, and is connected to the hydraulic excitation through the transmission component; The clamping component is sleeved with connecting blades and connected with the fatigue loading component. The utility model realizes the convenient movement of the clamp device and the excitation device in the blade span direction through the universal clamp device, the transmission assembly and the transitional connection component of the blade root, improves the efficiency of single-axis fatigue testing of wind turbine blades and reduces the testing cost.

Description

A uniaxial fatigue testing device for wind turbine blades

Technical field

The utility model belongs to the technical field of fatigue testing of wind power blades, and more specifically, relates to a fatigue testing device for wind power blades.

Background technique

In response to the needs of the national dual-carbon strategy, the offshore wind energy industry and wind power technology have developed rapidly in recent years. Wind turbine blades are the core components of wind turbines that capture wind energy. The high reliability of their design is the key to promoting the independence of the wind energy industry and wind power technology. As wind turbine blades become larger, more flexible, and more personalized in design, and offshore wind turbines gradually expand into the deep sea, the service conditions become more complex and harsh, and the requirements for blade fatigue resistance have significantly increased. The corresponding fatigue testing technology has become more difficult, and fatigue Testing costs increase significantly.

At present, wind turbine blade-related companies and third-party certification agencies at home and abroad mainly use uniaxial loading to conduct full-scale structural fatigue tests on wind turbine blades. They use the same-frequency resonance principle and use rotating or reciprocating masses to excite, making the blades wave or swing. The array direction vibrates back and forth to produce cyclic test loads. Due to the long test cycle and low test accuracy, the single-axis single-point fatigue test of blades can no longer meet the needs of fatigue testing of large-scale and flexible wind turbine blades. The single-axis multi-point fatigue test of blades adjusts the excitation position and increases the counterweight mass at multiple positions. This method improves the test load distribution so that the test load in the critical area of the blade is close to the target load, which has become the mainstream technology for fatigue testing of wind turbine blades.

During the blade uniaxial multi-point fatigue test, due to the need to constantly adjust the excitation position and counterweight quality, due to changes in airfoil, chord length, twist angle and other parameters in the blade span direction, the versatility of the blade fixture along the blade span direction is reduced and it is difficult to It adapts to changes in the shape of the airfoil cross section; the reciprocating mass type has a relatively fixed position due to the hydraulic excitation force, and the excitation platform's excitation force position covers a large area. The manufacturing cost is high, and the excitation force position adjustment takes a long time, which reduces the efficiency of blade fatigue testing; due to this, Due to the high weight of the blade and the high load on the blade root, the manufacturing cost of the blade fatigue test base is high. However, the replacement cycle of wind turbine blades is short. A universal blade root base can further reduce the cost of fatigue testing.

Contents of the invention

The technical problem to be solved by this utility model is to provide a uniaxial fatigue testing device for wind turbine blades, which realizes the convenient movement of the clamp device and the excitation device in the blade span direction through a universal clamp device, a seesaw transmission device and a blade root transition connection component. , which improves the efficiency of uniaxial fatigue testing of wind turbine blades and reduces testing costs.

In order to solve the above technical problems, the technical solution adopted by this utility model is: a uniaxial fatigue testing device for wind turbine blades, which includes a base, a transitional connection component, a blade, a blade clamp, and a hydraulic excitation. The base is fixedly placed; The transitional connection part is detachably and fixedly connected to the base; the root of the blade is fixedly connected to the transitional connection part using bolts; the blade clamp is set on the outside of the blade; the blade clamp is connected through a transmission assembly Connect the hydraulic excitation, and the hydraulic excitation drives the blade to achieve reciprocating vibration;

The blade clamp includes a fatigue loading component and a clamping component. The fatigue loading component is located on both sides of the clamping component and is connected to the hydraulic excitation through a transmission component; the clamping component is sleeved and connected to the blade. Connected to the fatigue loading component.

Preferably, the fatigue loading assembly includes a fixed cylinder, a transverse plate, a guide rod, a counterweight, a guide rail, a first support seat and a second support seat, and the fixed cylinder is fixedly connected to the transverse plate and connected with the The transmission components are connected, and the horizontal plate is placed horizontally. Both ends of the horizontal plate are respectively connected to a guide rod. The other end of the guide rod passes through the first support base and is connected to a counterweight block. The counterweight block A guide rail is slidingly connected to both sides of the guide rail, and the upper and lower ends of the guide rail are respectively fixedly connected to the first support base and the second support base. The first support base and the second support base are fixedly connected to each other. On the outer frame of the blade clamp, the clamping assembly is fixedly connected between the two counterweight blocks, and the two counterweight blocks drive the clamping assembly to make linear reciprocating motion along the direction of the guide rail.

Preferably, the clamping assembly includes a threaded rod, a suction cup, a flexible plate, a reel, a third support seat and a fourth support seat, and the third support seat and the fourth support seat are located at opposite sides of the blade. On both sides, a number of threaded rods are provided on the third support base and the fourth support base. One end of the threaded rod is connected to the third support base or the fourth support base, and the other end is fixedly connected. One of the suction cups, the suction cup is adsorbed and connected to the flexible plate, the flexible plate covers the outer surface of the blade, the drum is fixedly connected to the outer frame of the blade clamp and connected to the flexible plate .

Preferably, the transmission assembly includes a fixed rod, a sleeve, a rolling element, a first sliding rod, a second sliding rod and a slide rail, and the fixed rod is cooperatively connected with the fixed sleeve and fixedly connected with the sleeve, The sleeve cooperates with the rolling element to form a rotating pair and moves in the slide groove in the first slide rod. The first slide rod is slidingly connected to the second slide rod through the slide rail. The second slide rod is rotatably connected to the support assembly.

Preferably, the support assembly includes a cylindrical bolt, a first upright column and a second upright column. The first upright column and the second upright column are provided with a number of cylindrical holes from top to bottom, and the cylindrical bolt is sleeved and connected to the In the cylindrical hole, the first upright column and the second upright column are arranged on both sides of the second sliding rod, and the second sliding rod is rotationally connected to the first upright column and the second upright column through the cylindrical bolt. Upright column, the blade clamp and the hydraulic excitation are located on both sides of the first upright column and the second upright column.

Preferably, the transitional connection component includes a fastening screw, a connecting seat and a connecting internal threaded hole. One end of the connecting seat is connected to the base through the fastening screw, and the connecting internal threaded hole is opened in the At the other end of the connecting seat, the bolt at the root of the blade is screwed into the internal threaded hole of the connection, thereby connecting the root of the blade with the connecting seat.

Preferably, the base includes a concrete foundation, a concrete cap, a support frame, an auxiliary platform, and a fixed base. The concrete cap is erected on the concrete foundation, and the fixed base is disposed on the concrete cap. Inside, the fixed seat is connected to the transitional connection component through the fastening screw, the auxiliary platform is provided on both sides of the root of the blade, and the support frame is provided on both sides of the concrete bearing platform. .

The beneficial effects produced by adopting the above technical solutions are:

(1) By using different types of transitional connection components, this utility model can achieve blade root fixation for fatigue test experiments on different blades, thereby reducing the cost of replacing different bases for fatigue test experiments on different blades in traditional tests.

(2) This utility model realizes the fastening of multiple types of blades through the cooperation of threaded rods, suction cups, and flexible plates. It overcomes the traditional problem that different blade clamps are needed to fix different types of blades, and realizes the versatility of the blade clamp.

(3) Through the design of transitional connecting parts, blade clamps and loading parts, this utility model can meet the single-point and multi-point fatigue testing tests of single-axis wind turbine blades of various specifications and models.

(4) This utility model utilizes the elasticity of the transmission assembly to well implement fatigue testing of different types of blades and different airfoil sections.

(5) This utility model utilizes the ductility of the support assembly to achieve good height adjustment of the loading component and improves the versatility of the loading device.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model;

Figure 2 is a schematic structural diagram of the blade clamp;

Figure 3 is a schematic side view of the clamping assembly;

Figure 4 is a schematic structural diagram of the A-A section in Figure 3;

Figure 5 is a schematic structural diagram of the transmission assembly;

Figure 6 is a schematic structural diagram of the base;

Figure 7 is a schematic structural diagram of the transition connection component.

In the picture: 1. Base; 2. Transition connection parts; 3. Blade; 4. Blade clamp; 5. Fatigue loading component; 6. Hydraulic excitation; 7. Fixed cylinder; 8. Horizontal plate; 9. Guide rod; 10 , first support base; 11. second support base; 12. counterweight block; 13. guide rail; 14. threaded rod; 15. suction cup; 16. flexible plate; 17. third support base; 18. fourth support base ; 19. Reel; 20. Fixed rod; 21. Sleeve; 22. Rolling member; 23. First sliding rod; 24. Slide rail; 25. Second sliding rod; 26. Cylindrical bolt; 27. First column ; 28. Second column; 29. Support frame; 30. Concrete cap; 31. Fixed seat; 32. Auxiliary platform; 33. Concrete foundation; 34. Fastening screw; 35. Connecting seat; 36. Connecting internal thread hole .

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

As shown in Figure 1, a preferred embodiment of a uniaxial fatigue testing device for wind turbine blades is provided. The device includes: a base 1, a transitional connection component 2, a blade 3, a blade clamp 4, and a fatigue loading component 5. The base 1 is fixedly placed; the transitional connection part 2 is fixedly connected to the base 1; the root of the blade 3 and the transitional connection part 2 are fixedly connected with bolts; the blade clamp 4 adopts a truss structure to form a clamping component fixed on the blade 3, and is fixed on the blade 3 through the suction cups 15, The flexible plate 16, threaded rod 14 and other components adjust the shape of the fixture to adapt to changes in the spanwise airfoil cross-section shape; the fatigue loading component 5 transmits hydraulic excitation through a seesaw-type transmission component and drives the counterweight 12 to perform linear reciprocating motion, making the blade 3 Reciprocating vibration is generated in the waving or oscillating direction; the counterweight component is fixed on the blade 3 using a gripper component to improve the test load distribution.

In this embodiment, when the hydraulic excitation 6 excites the second sliding rod 25 upward, the fixed rod 20 drives the fixed cylinder 7 to move downward, thereby pushing the horizontal plate 8 and the guide rod 9 to move downward, thereby achieving a counterweight The block 12 moves downward, finally realizing the movement of the blade 3 in the flapping direction. When the hydraulic excitation 6 gives continuous periodic excitation, the counterweight 12 is caused to make a reciprocating linear motion in the guide rail 13, thereby driving the blade 3 to make a reciprocating linear motion in the flapping direction. Through the resonance principle, fatigue loading is achieved.

Specifically, as shown in FIG. 6 , the base 1 includes a concrete foundation 33 , a concrete platform 30 , a support frame 29 , an auxiliary platform 32 , and a fixed base 31 . The auxiliary platform 32 is provided on both sides of the root of the blade 3, and the auxiliary platform 32 can move in the vertical plane to assist in the bolt fixing construction and maintenance work of the blade root. The fixed seat 31 is provided inside the vertical concrete platform 30 and is screwed together with the fastening screw 34 in the transitional connection component 2. The support brackets 29 are provided on both sides of the concrete platform 30 to enhance the strength and strength of the overall base 1. Improve device reliability.

As shown in FIG. 7 , the transitional connection component 2 includes a fastening screw 34 , a connecting seat 35 and an internal threaded hole 36 . The fastening screw 34 is connected and fixed with the fixed seat 31 in the base 1, and the other end is matched and fixed with the connecting seat 35. The internal threaded hole 36 is opened at the other end of the connecting seat 35 and is bolted to the blade root of the blade 3.

The blade clamp 4 includes a fatigue loading component and a clamping component. As shown in Figures 2 to 4, the fatigue loading assembly includes a fixed cylinder 7, a horizontal plate 8, a guide rod 9, a first support base 10, a second support base 11, a counterweight 12, and a guide rail 13. The fixed cylinder 7 and the fixed rod 20 are connected and fixed by pins. The guide rod 9 and the counterweight block 12 are symmetrically distributed on both sides of the blade clamp. The purpose is to maintain balance when a load is applied to the blade, so that the blade clamp 4 and the blade 3 resonate. When doing so, the whole device can be well balanced. In addition, the clamping assembly is composed of a threaded rod 14, a suction cup 15, a flexible plate 16, a third support seat 17, a fourth support seat 18, and a drum 19. The flexible plate 16 covers the surface of the blade 3. By adjusting the threaded rod 14, The positions of the third support base 17 and the fourth support base 18 enable the scaling of the flexible plate 16; the suction cup 15 is adsorbed on the surface of the flexible plate 16 through the effect of pressure difference. First, it reaches the connection between the threaded rod 14 and the flexible plate 16. The second purpose is to prevent the flexible plate 16 from moving during the test and to constrain the flexible plate 16; the beneficial effect of the drum 19 is that when the blade clamp 4 moves on the blade 3, the drum 19 can be By tightening and relaxing the flexible plate 16, the blade clamp 4 can be moved and adjusted, so that the optimal position of the blade clamp 4 on the blade 3 can be found during the test.

As shown in FIG. 5 , the transmission assembly includes a fixed rod 20 , a sleeve 21 , a rolling element 22 , a first slide rod 23 , a slide rail 24 , and a second slide rod 25 . Both ends of the transmission assembly are connected to the blade clamp 4 and the hydraulic excitation 6 respectively. The second sliding rod 25 forms a rotating pair connection with the first column 27 and the second column 28 through the cylindrical bolt 26. The first sliding rod 23 can be realized through the slide rail 24. The extension effect greatly improves the versatility of the fatigue loading component 5 and makes it more convenient in actual use, thus overcoming the shortcomings of traditional test devices and achieving cost savings.

The support assembly includes a cylindrical bolt 26, a first upright column 27, and a second upright column 28, as shown in Figure 5. The function of the cylindrical bolt 26 is to connect the transmission assembly with the first upright column 27 and the second upright column 28. The two upright columns are provided with cylindrical holes of different heights. The cylindrical bolt 26 is set in the cylindrical hole to change the height of the transmission assembly. The height of the blade fixture enables fatigue loading of different types of blade fatigue tests.

The above are only preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person familiar with the technical field can, within the technical scope disclosed by the present utility model, make use of the present utility model. Any equivalent substitution or change of the technical solution and the concept of the utility model shall be covered by the protection scope of the present utility model.

Claims (7)

1. A uniaxial fatigue testing device for wind turbine blades, characterized in that it includes a base, a transition connection component, a blade, a blade clamp, and a hydraulic excitation. The base is fixedly placed; the transition connection component and the base can be The fixed connection is disassembled; the root of the blade and the transitional connection part are fixedly connected by bolts; the blade clamp is sleeved on the outside of the blade; the blade clamp is connected to the hydraulic excitation through a transmission assembly, and the hydraulic excitation Drive the blade to achieve reciprocating vibration; The blade clamp includes a fatigue loading component and a clamping component. The fatigue loading component is located on both sides of the clamping component and is connected to the hydraulic excitation through a transmission component; the clamping component is sleeved and connected to the blade. Connected to the fatigue loading component. 2. A uniaxial fatigue testing device for wind turbine blades according to claim 1, characterized in that the fatigue loading assembly includes a fixed cylinder, a transverse plate, a guide rod, a counterweight, a guide rail, a first support seat and a third Two support seats, the fixed barrel is fixedly connected to the horizontal plate and connected to the transmission assembly. The horizontal plate is placed horizontally. Both ends of the horizontal plate are connected to a guide rod respectively, and the other end of the guide rod is One end passes through the first support base and is connected to a counterweight block. Both sides of the counterweight block are slidingly connected to a guide rail. The upper and lower ends of the guide rail are respectively fixedly connected to the first support base and the second support base. A support base, the first support base and the second support base are fixedly connected to the outer frame of the blade clamp; the clamping assembly is fixedly connected between the two counterweight blocks, and the two The counterweight drives the clamping assembly to perform linear reciprocating motion along the direction of the guide rail. 3. A uniaxial fatigue testing device for wind turbine blades according to claim 2, characterized in that the clamping assembly includes a threaded rod, a suction cup, a flexible plate, a drum, a third support seat and a fourth support seat, The third support seat and the fourth support seat are located on opposite sides of the blade. A plurality of threaded rods are provided on the third support seat and the fourth support seat. The threaded rods are One end is connected to the third support base or the fourth support base, and the other end is fixedly connected to one of the suction cups. The suction cups are adsorbed and connected to the flexible plate. The flexible plate covers the outer surface of the blade. The drum is fixedly connected to the outer frame of the blade clamp and connected to the flexible plate. 4. A single-axis fatigue testing device for wind turbine blades according to claim 2, characterized in that the transmission assembly includes a fixed rod, a sleeve, a rolling element, a first sliding rod, a second sliding rod and a slide rail, The fixed rod is cooperatively connected with the fixed cylinder and is fixedly connected with the sleeve. The sleeve cooperates with the rolling element to form a rotating pair and moves in the chute in the first slide rod. The first sliding rod is slidably connected to the second sliding rod through the slide rail, and the second sliding rod is rotationally connected to the support assembly. 5. A uniaxial fatigue testing device for wind turbine blades according to claim 4, wherein the support assembly includes a cylindrical bolt, a first upright column and a second upright column, and the first upright column and the second upright column A number of cylindrical holes are provided from top to bottom, and the cylindrical bolts are sleeved and connected in the cylindrical holes. The first upright column and the second upright column are provided on both sides of the second sliding rod. Two sliding rods are rotatably connected to the first upright column and the second upright column through the cylindrical bolt, and the blade clamp and the hydraulic excitation are located on both sides of the first upright column and the second upright column. 6. A uniaxial fatigue testing device for wind turbine blades according to claim 1, wherein the transitional connection component includes a fastening screw, a connecting seat and an internal threaded hole, and one end of the connecting seat passes through the The fastening screw is connected to the base, the connection internal thread hole is opened at the other end of the connection seat, and the bolt at the root of the blade is screwed with the connection internal thread hole, thereby connecting the root of the blade to The connecting bases are connected together. 7. A uniaxial fatigue testing device for wind turbine blades according to claim 6, characterized in that the base includes a concrete foundation, a concrete bearing platform, a support frame, an auxiliary platform, and a fixed seat, and the concrete bearing platform is erected. is arranged on the top of the concrete foundation, the fixed seat is arranged inside the concrete bearing platform, the fixed seat is connected to the transitional connection component through the fastening screw, and the auxiliary platform is arranged on the blade On both sides of the root, the support frames are arranged on both sides of the concrete bearing platform.