Fan blade swing fatigue testing device

Abstract

The utility model discloses a fan blade swing fatigue testing device, and belongs to the technical field of fan blade fatigue testing. Comprising a blade clamping module and a fatigue loading excitation module. The fatigue loading excitation module comprises a plurality of groups of random wooden saddles used for clamping blades in an up-down matching manner, the random wooden saddles comprise upper random wooden saddles and lower random wooden saddles, upper steel plates are arranged at the tops of the upper random wooden saddles, lower steel plates are arranged at the bottoms of the lower random wooden saddles, and the upper steel plates and the lower steel plates are connected through studs; an excitation motor is arranged on the upper steel plate, and the output end of the excitation motor is connected with the eccentric mass block through a rotating arm. The blade fatigue testing device has the advantages of reducing testing energy consumption, improving blade testing efficiency, being suitable for fatigue testing of blades of different sizes, and being low in testing noise.

Description

Technical Field

[0001] This utility model relates to a wind turbine blade oscillation fatigue testing device, belonging to the field of wind turbine blade fatigue testing technology. Background Technology

[0002] The cooling tower fan is the core component of the entire cooling tower. It extracts hot air that has undergone heat exchange from the top of the cooling tower and guides cooler air into the bottom air inlet. Studies of fan failures have revealed that fan blades are highly prone to failure and suffer severe damage. Fan blades are subjected to dynamic loads over long periods, making them susceptible to fatigue failure. In axial flow fans, the lifespan of the blades largely depends on their fatigue life. The forces acting on the blades are complex and difficult to determine precisely. The raw materials used in blade production are diverse in type and specification, with significant performance variations. Different manufacturing processes have a substantial impact on the strength and quality of the blades. Fatigue performance cannot be obtained solely through calculation; only full-scale fatigue testing of the blades can provide reliable confirmation of the design. For newly developed blades, experimental analysis of fatigue life is essential. Even for mass-produced blades, fatigue testing is necessary after significant technological improvements to the process. Full-scale fatigue testing is a crucial step in ensuring blade quality and lifespan.

[0003] Early fatigue loading tests on blades typically employed forced loading, using hydraulic actuators to apply force or displacement to bring the blade amplitude to a set value, thus completing the fatigue vibration test. However, this loading method requires excessively powerful excitation equipment, resulting in high energy consumption. Existing testing facilities require large floor areas, and blades of different lengths cannot be tested on a single device; the testing time is long because the blade rotation speed cannot be too high due to motor power limitations, leading to numerous start-stop cycles and extended testing time; the noise generated by the fan during testing is extremely high, causing severe noise pollution. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a wind turbine blade oscillation fatigue testing device that reduces energy consumption, improves testing efficiency, has strong compatibility, and reduces testing noise.

[0005] The technical solution of this utility model is: a wind turbine blade oscillation fatigue testing device, including a blade clamping module and a fatigue loading excitation module; the fatigue loading excitation module includes several sets of conforming wooden saddles for clamping the blades from the top and bottom, the conforming wooden saddles including an upper conforming wooden saddle and a lower conforming wooden saddle, the upper conforming wooden saddle having an upper steel plate at its top and the lower conforming wooden saddle having a lower steel plate at its bottom, the upper steel plate and the lower steel plate being connected by double-headed bolts, the upper steel plate having an excitation motor, and the output end of the excitation motor being connected to an eccentric mass block through a rotating arm.

[0006] The output end of the excitation motor is connected to the rotating arm via a tensioning sleeve.

[0007] The excitation motor is fixed to the motor support with fixing bolt d, and the motor support is fixed to the upper steel plate with fixing bolt a.

[0008] The blade clamping module includes a mounting base, on which a U-bolt for fixing the blade shaft is provided, and the U-bolt is detachably connected to the mounting base.

[0009] The mounting base is fixed to the bottom bracket.

[0010] The eccentric mass block is connected to the rotating arm by a fixing bolt b.

[0011] The blade shaft and the blade are fixed together by fixing bolts c.

[0012] Angle steel is provided on the side of the upper steel plate, and the upper conforming wooden saddle is fixed to the upper steel plate by the angle steel and the fixing bolt e.

[0013] The beneficial effects of this invention are: reduced testing energy consumption, improved blade testing efficiency, applicability to fatigue testing of blades of different sizes, and low testing noise. Attached Figure Description

[0014] Figure 1 This is an application view of the present invention;

[0015] Figure 2 for Figure 1 Side view.

[0016] The following are the reference numerals in the attached diagram: 1. Mounting base, 2. U-bolt, 3. Blade shaft, 4. Upper steel plate, 5. Blade, 6. Fixing bolt c, 7. Upper conforming wooden saddle, 8. Angle steel, 9. Double-ended bolt, 10. Fixing bolt a, 11. Rotating arm, 12. Excitation motor, 13. Tensioning sleeve, 14. Fixing bolt d, 15. Lower steel plate, 16. Motor support, 17. Fixing bolt b, 18. Eccentric mass block, 19. Lower conforming wooden saddle. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-2 Further explanation of this utility model:

[0018] A wind turbine blade oscillation fatigue testing device includes a blade clamping module and a fatigue loading vibration module. The fatigue loading vibration module includes several sets of conformal wooden saddles for clamping the blade 5 from both above and below. Each conformal wooden saddle includes an upper conformal wooden saddle 7 and a lower conformal wooden saddle 19. The upper conformal wooden saddle 7 has an upper steel plate 4 at its top, and the lower conformal wooden saddle 19 has a lower steel plate 15 at its bottom. The upper steel plate 4 and the lower steel plate 15 are connected by double-headed bolts 9. An excitation motor 12 is mounted on the upper steel plate 4. The excitation motor 12 is fixed to a motor support 16 by fixing bolts d14. The motor support 16 is fixed to the upper steel plate 4 by fixing bolts a10. The output end of the excitation motor 12 is connected to an eccentric mass block 18 through a rotating arm 11. The eccentric mass block 18 and the rotating arm 11 are connected by fixing bolts b17. The output end of the excitation motor 12 and the rotating arm 11 are connected by a tensioning sleeve 13.

[0019] The blade clamping module includes a mounting base 1, which is fixed to a bottom bracket. The mounting base 1 is equipped with U-bolts 2 for fixing the blade shaft 3, and the U-bolts 2 are detachably connected to the mounting base 1. The blade shaft 3 and the blade 5 are fixed together by fixing bolts c6. The U-shaped opening of the U-bolt 2 faces the blade shaft 3, allowing the blade shaft 3 to be fixed to the mounting base 1.

[0020] Angle steel 8 is provided on the side of the upper steel plate 4, and the upper conforming wooden saddle 7 is fixed to the upper steel plate 4 by the angle steel 8 and the fixing bolt e. The lower steel plate 15 is also provided with angle steel 8 on the side for connecting and fixing the lower conforming wooden saddle 19.

[0021] Before testing, one end of the blade shaft 3 of blade 5 is fixed to the mounting base 1 by two U-bolts 2. Two sets of conformal wooden saddles clamp blade 5. After the excitation motor 12 is started, it drives the eccentric mass block to perform simple harmonic motion, generating a constant or variable amplitude cyclic inertial excitation force to drive the blade to vibrate. By adjusting the output frequency of the excitation motor 12, blade 5 can reach a resonance state. Blade 5 completes the fatigue cycle vibration number of the corresponding test load intensity in the resonance state, thus completing the fatigue test.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A wind turbine blade oscillation fatigue testing apparatus, characterized by, It includes a blade clamping module and a fatigue loading excitation module; the fatigue loading excitation module includes several sets of conforming wooden saddles for clamping the blade (5) from the top and bottom. The conforming wooden saddles include an upper conforming wooden saddle (7) and a lower conforming wooden saddle (19). The upper conforming wooden saddle (7) is provided with an upper steel plate (4) at the top and the lower conforming wooden saddle (19) is provided with a lower steel plate (15) at the bottom. The upper steel plate (4) and the lower steel plate (15) are connected by double-headed bolts (9). The upper steel plate (4) is provided with an excitation motor (12). The output end of the excitation motor (12) is connected to an eccentric mass block (18) through a rotating arm (11).

2. The wind turbine blade oscillation fatigue testing apparatus according to claim 1, wherein The output end of the excitation motor (12) is connected to the rotating arm (11) through a tensioning sleeve (13).

3. The wind turbine blade oscillation fatigue testing apparatus according to claim 1, wherein The excitation motor (12) is fixed on the motor support (16) with the fixing bolt d (14), and the motor support (16) is fixed on the upper steel plate (4) by the fixing bolt a (10).

4. The fan blade oscillation fatigue testing device according to claim 1, wherein The blade clamping module includes a mounting base (1), on which a U-bolt (2) for fixing the blade shaft (3) is provided. The U-bolt (2) is detachably connected to the mounting base (1).

5. The wind turbine blade oscillation fatigue testing apparatus according to claim 4, wherein The mounting base (1) is fixed on the bottom bracket.

6. The wind turbine blade oscillation fatigue testing apparatus according to claim 1, wherein The eccentric mass block (18) is connected to the rotating arm (11) by a fixing bolt b (17).

7. The wind turbine blade oscillation fatigue testing apparatus according to claim 4, wherein The blade shaft (3) and the blade (5) are fixed together by a fixing bolt c (6).

8. The wind turbine blade oscillation fatigue testing apparatus according to claim 1, wherein Angle steel (8) is provided on the side of the upper steel plate (4), and the upper conforming wooden saddle (7) is fixed to the upper steel plate (4) by the angle steel (8) and the fixing bolt e.

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