Pull-down loading device for wind power blade static test

Abstract

The utility model discloses a pull-down loading device for a wind power blade static test, and belongs to the technical field of wind power blade tests. Comprising a plurality of loading units which are sequentially arranged in the length direction of a blade, all the loading units are located below the blade, each loading unit comprises a movable pulley mechanism connected with the blade, and a fixed pulley mechanism is fixed below the movable pulley mechanism. One end of the steel rope is relatively fixed with the fixed pulley mechanism, and the other end of the steel rope is connected with the power device after bypassing the movable pulley mechanism and the fixed pulley mechanism. According to the pull-down loading device for the static test of the wind power blade, the limiting guide mechanism is arranged in the fixed pulley mechanism, and the steel cable is limited through the limiting guide mechanism after bypassing the fixed pulley, so that large-angle deviation of the steel cable is avoided, and the test precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind turbine blade testing, and in particular relates to a pull-down loading device for a static test of a wind turbine blade. Background Art

[0002] Blade static testing is the process of subjecting blades to static load testing. In this test, the blades are exposed to specific static loads, simulating the forces under actual use conditions, to evaluate the performance and stability of the blades when subjected to static loads.

[0003] In the prior art, there are two main types of static tests for blades: side-pull and bottom-pull. The test plan for the bottom-pull static test is as follows: after the blade is fixed horizontally, a corresponding number of clamps are installed on the outside of the blade according to the test requirements, a movable pulley is installed at the bottom of each clamp, and a fixed pulley is fixed under each movable pulley. The steel cable output from the winch is passed around the fixed pulley and the movable pulley in turn and then fixed to the ground. Static force is applied to the blade through the winch to complete the static test of the blade, such as: the technical solution recorded in the Chinese invention patent with application number 202411312972.4, application date September 20, 2024, and patent name "Wind turbine blade static testing equipment", the technical solution recorded in the Chinese utility model patent with application number 202121845009.4, application date August 8, 2021, and patent name "A wind turbine blade static testing device", and the technical solution recorded in the Chinese utility model patent with application number 202420096066.4, application date January 16, 2024, and patent name "A static pull-down loading reversing device".

[0004] The existing technologies including the above technical solutions still have the following defects in actual implementation: (1) After the steel cable is output from the fixed pulley, under the action of the blades, the steel cable is often unable to connect with the movable pulley in the vertical direction, that is, in subsequent tests, the steel cable is in a state of large angle deviation, and may even fall out of the groove of the fixed pulley, thereby causing the subsequent test accuracy to decrease. (2) In the existing technology, the steel cable is generally woven by a number of thin steel wires. Therefore, after the steel cable is tightened, it has a certain stress. When the winch pulls the blades through the steel cable, the stress of the steel cable itself will also be applied to the blades, thereby affecting the test results. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art and to provide a pull-down loading device for static testing of wind turbine blades, which provides a limit guide mechanism in a fixed pulley mechanism, wherein the steel cable is limited by the limit guide mechanism after passing around the fixed pulley, thereby avoiding a large angle deviation of the steel cable and improving the test accuracy.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the pull-down loading device for static test of wind turbine blades comprises a plurality of loading units arranged in sequence along the length direction of the blades, all the loading units are located below the blades, the loading units comprise a movable pulley mechanism connected to the blades, a fixed pulley mechanism is fixed below the movable pulley mechanism, and the utility model is characterized in that the fixed pulley mechanism comprises a fixed pulley and a limit guide mechanism, the limit guide mechanism is arranged at the outlet end of the fixed pulley, one end of the steel cable is relatively fixed to the fixed pulley mechanism, and the other end is connected to the power device after passing the movable pulley mechanism and the fixed pulley mechanism.

[0007] Preferably, the position limiting guide mechanism comprises a group of guide wheels arranged at intervals, wherein the guide wheels are located above the fixed pulley and the guide wheels are located on both sides of the fixed pulley.

[0008] Preferably, the axle of the guide wheel is perpendicular to the axle of the fixed pulley.

[0009] Preferably, the fixed pulley mechanism further comprises two fixed pulley fixing plates arranged at intervals, the fixed pulley is installed between the two fixed pulley fixing plates, a guide fixing plate is respectively fixed on the sides of the two fixed pulley fixing plates, and the guide wheels are fixed side by side between the two guide fixing plates.

[0010] Preferably, a plurality of spacer plates are vertically fixed between the guide fixing plates on both sides, and two guide shafts are arranged side by side between the two guide fixing plates. The two guide shafts are respectively fixed after passing through all the spacer plates, and a guide wheel is installed on each guide shaft.

[0011] Preferably, a connecting plate is fixed between the two fixed pulley fixing plates, and a connecting hole for hanging a steel cable is opened in the middle of the connecting plate.

[0012] Preferably, a lug mechanism is further provided on the side of the fixed pulley mechanism, and the lug mechanism and the connecting plate are respectively located on both sides of the fixed pulley.

[0013] Preferably, the ear hanging mechanism comprises an ear hanging base plate, on the surface of which two ear hanging fixing plates are vertically arranged, and the ear hanging for hanging with the steel cable is movably installed between the two ear hanging fixing plates.

[0014] Preferably, the fixed pulley mechanism is fixed on the surface of the base, and the base and the power device are installed on the surface of the ground rail.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] In the pull-down loading device for static testing of wind turbine blades, a limit guide mechanism is provided in the fixed pulley mechanism, and after the steel cable passes around the fixed pulley, it is limited by the limit guide mechanism, thereby avoiding large angle deviation of the steel cable and improving the test accuracy.

[0017] In the limiting guide mechanism, the steel cable passes through the two guide wheels after passing around the fixed pulley and extends to the movable pulley. The guide wheels not only limit the steel cable, but also guide the steel cable.

[0018] In the pull-down loading device for static testing of wind turbine blades, a lug mechanism is provided on the side of the fixed pulley mechanism, and the lug mechanism and the connecting plate are respectively located on both sides of the fixed pulley in the fixed pulley mechanism. After the steel cable passes around the fixed pulley and the movable pulley, it can be connected to the connecting plate or the lug mechanism according to the braiding direction of the steel cable, thereby avoiding the influence of the stress of the steel cable itself on the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of a loading unit of a pull-down loading device used for static testing of wind turbine blades.

[0020] Figure 2 An axonometric view of the loading unit of the pull-down loading device used for static testing of wind turbine blades.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 This is an axonometric view of the fixed pulley mechanism of the pull-down loading device used for static testing of wind turbine blades.

[0023] Figure 5 This is a front view of the fixed pulley mechanism of the pull-down loading device used for static testing of wind turbine blades.

[0024] Figure 6 for Figure 5 Top view of the .

[0025] Figure 7 for Figure 5 Left view of .

[0026] Figure 8 This is an axonometric view of the lug mechanism of the pull-down loading device used for static testing of wind turbine blades.

[0027] Fig. 9 This is an axonometric view of the movable pulley mechanism of the pull-down loading device used for static testing of wind turbine blades.

[0028] Fig.10 Schematic diagram of the test process of the pull-down loading device used for static testing of wind turbine blades.

[0029] Fig.11 This is a schematic diagram of the connection between the steel cable and the fixed pulley mechanism during the pull-down loading device test for static testing of wind turbine blades.

[0030] Fig.12 This is a schematic diagram of the connection between the steel cable and the lug mechanism during the pull-down loading device test for static testing of wind turbine blades.

[0031] Among them: 1. ground rail; 2. base; 3. movable pulley mechanism; 4. fixed pulley mechanism; 5. hanging ear mechanism; 6. mounting groove; 7. winch; 8. connecting plate; 9. guide wheel; 10. guide shaft; 11. guide fixing plate; 12. fixed pulley; 13. fixed pulley fixing plate; 14. fixed pulley base plate; 15. spacer plate; 16. hanging ear; 17. hanging ear shaft; 18. hanging ear fixing plate; 19. hanging ear base plate; 20. connecting pin; 21. movable pulley fixing plate; 22. movable pulley; 23. reinforcement plate; 24. fixed base; 25. blade; 26. clamp; 27. steel cable. DETAILED DESCRIPTION

[0032] Figure 1 to Figure 12 It is the best embodiment of the utility model, and the following Figure 1 to Figure 12 The utility model is further described.

[0033] A pull-down loading device for static testing of wind turbine blades comprises a plurality of loading units arranged side by side, such as Figure 1~Figure 3 As shown, the loading unit includes a base 2 arranged on the surface of the ground rail 1, and a hoist 7 is arranged on the extension line of the arrangement direction of the base 2. A plurality of mounting grooves 6 are opened on the surface of the ground rail 1, and the base 2 and the hoist 7 are respectively clamped in the corresponding mounting grooves 6, so that the base 2 and the hoist 7 can slide along the opening direction of the mounting grooves 6.

[0034] The loading unit 2 also includes a fixed pulley mechanism 4 fixed on the surface of the base 2 and a lug mechanism 5 fixed on the side of the fixed pulley mechanism 4. The lug mechanism 5 is located on the side of the fixed pulley mechanism 4 facing the winch 7. A movable pulley mechanism 3 is also arranged directly above the fixed pulley mechanism 4, and the top of the movable pulley mechanism 3 is connected to the blade 25. The steel cable 27 output from the winch 7 extends to the lug mechanism 5, and after passing through the lug mechanism 5 and the fixed pulley mechanism 4, it extends directly upward to the movable pulley mechanism 3, and after bypassing the movable pulley mechanism 3, it extends downward in the opposite direction and is fixed. When the winch 7 is working, the steel cable 27 outputs the pulling force to the movable pulley mechanism 3, and further transmits the pulling force to the blade 25 through the movable pulley mechanism 3 to realize the static test.

[0035] like Figure 4~Figure 7As shown, the fixed pulley mechanism 4 includes a fixed pulley base plate 14, and a plurality of fixing bolts are arranged around the fixed pulley base plate 14, and the fixed pulley base plate 14 is fixed to the surface of the base 2 by the fixing bolts. Two fixed pulley fixing plates 13 are vertically arranged on the surface of the fixed pulley base plate 14, and the two fixed pulley fixing plates 13 are arranged at intervals, and a plurality of reinforcing plates are respectively arranged between each fixed pulley fixing plate 13 and the fixed pulley base plate 14.

[0036] The fixed pulley 12 is installed between two fixed pulley fixing plates 13. The fixed pulley 12 is located on the side of the fixed pulley fixing plate 13 close to the ear hanging mechanism 5. The wheel axle of the fixed pulley 12 is perpendicular to the fixed pulley fixing plates 13 on both sides. A connecting plate 8 is also fixed between the two fixed pulley fixing plates 13. The connecting plate 8 is located on the side of the fixed pulley fixing plate 13 near the ear hanging mechanism 5. A connecting hole is opened in the middle of the connecting plate 8.

[0037] A guide fixing plate 11 is fixed to the outside of the two fixed pulley fixing plates 13, and a plurality of spacer plates 15 are arranged side by side between the two guide fixing plates 11. The ends of each spacer plate 15 are vertically fixed to the guide fixing plate 11 on the corresponding side. Two guide shafts 10 are arranged side by side between the two guide fixing plates 11. The axes of the two guide shafts 10 are respectively connected to the guide fixing plates 11 on both sides, and the two guide shafts 10 are respectively fixed after passing through all the spacer plates 15. A guide wheel 9 is rotatably installed in the middle of the two guide shafts 10. The two guide wheels 9 are respectively located directly above the fixed pulley 12 and on both sides of the groove in the middle of the fixed pulley 12. The wheel axles of the two guide wheels 9 are perpendicular to the wheel axles of the fixed pulley 12.

[0038] like Figure 8 As shown, the ear hanging mechanism 5 includes an ear hanging base plate 19, and a plurality of fixing bolts are respectively arranged at the four corners of the ear hanging base plate 19, and the ear hanging base plate 19 is fixed to the surface of the base 2 by the fixing bolts. Two ear hanging fixing plates 18 are vertically arranged on the surface of the ear hanging base plate 19, and the two ear hanging fixing plates 18 are arranged at intervals, and a plurality of reinforcing plates are respectively arranged between each ear hanging fixing plate 18 and the ear hanging base plate 19.

[0039] A hanging ear shaft 17 is provided between the two hanging ear fixing plates 18 . The hanging ear shaft 17 is vertically fixed to the hanging ear fixing plates 18 on both sides, and a hanging ear 16 is movably mounted on the hanging ear shaft 17 .

[0040] like Fig. 9 As shown, the movable pulley mechanism 3 includes two movable pulley fixing plates 21 arranged opposite to each other, and the sides of the two movable pulley fixing plates 21 are fixed as a whole by a reinforcing plate 23. A rotating shaft is respectively installed at the upper and lower parts between the two movable pulley fixing plates 21, a movable pulley 22 is rotatably installed at the lower rotating shaft, and a connecting pin 20 is rotatably installed at the upper rotating shaft.

[0041] The specific working process and working principle are as follows:

[0042] like Fig.10 As shown, according to the test requirements, a corresponding number of loading units are arranged on the surface of the ground rail 1, and the position of each loading unit is adjusted through the mounting groove 6. One end of the blade 25 is fixed to the fixed base 24, and the other side of the blade 25 extends horizontally and covers the top of the farthest loading unit.

[0043] A clamp 26 is arranged on the surface of the blade 25, and the clamp 26 is sleeved on the outside of the blade 25 and corresponds to the loading unit one by one. The clamp 26 adopts a well-known structure in the art, and its specific scheme is not repeated. The connecting pin 20 at the top of each group of loading unit multi-moving pulley mechanism 3 is fixed to the corresponding clamp 26.

[0044] The steel cable 27 output from the winch 7 corresponding to each group of loading units extends to the eye hook mechanism 5, and passes through the fixed pulley mechanism 4 at the rear eye from the bottom of the eye hook 16 in the eye hook mechanism 5. The steel cable 27 extends upward after bypassing the fixed pulley 12, and extends to the movable pulley mechanism 3 after passing through the two guide wheels 9. The steel cable 27 bypasses the movable pulley 22 in the movable pulley mechanism 3 and extends downward in the opposite direction.

[0045] At this time, according to the weaving direction of the steel cable 27, it is selected to be connected to the interruption connecting plate 8 of the fixed pulley mechanism 4 or to be connected to the hanging ear 16 in the hanging ear mechanism 5, such as Figure 11~Figure 12 As shown, the stress of the steel cable 27 itself is prevented from affecting the test result. Finally, the winch 7 works, outputs the pulling force to the movable pulley mechanism 3 through the steel cable 27, and further transmits the pulling force to the blade 25 through the movable pulley mechanism 3, so as to realize the static test of the blade 25.

[0046] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A pull-down loading device for a static test of a wind turbine blade, comprising a plurality of loading units arranged in sequence along the length direction of a blade (25), all of the loading units being located below the blade (25), the loading units comprising a movable pulley mechanism (3) connected to the blade (25), a fixed pulley mechanism (4) being fixed below the movable pulley mechanism (3), characterized in that: The fixed pulley mechanism (4) comprises a fixed pulley (12) and a limit guide mechanism, wherein the limit guide mechanism is arranged at the outlet end of the fixed pulley (12), one end of the steel cable (27) is fixed relative to the fixed pulley mechanism (4), and the other end of the steel cable (27) is connected to the power device after passing through the movable pulley mechanism (3) and the fixed pulley mechanism (4).

2. The pull-down loading device for static testing of wind turbine blades according to claim 1 is characterized in that: The position limiting guide mechanism comprises a group of guide wheels (9) arranged at intervals, wherein the guide wheels (9) are located above the fixed pulley (12), and the guide wheels (9) are located on both sides of the fixed pulley (12).

3. The pull-down loading device for static testing of wind turbine blades according to claim 1 is characterized in that: The wheel axle of the guide wheel (9) is perpendicular to the wheel axle of the fixed pulley (12).

4. The pull-down loading device for static testing of wind turbine blades according to claim 2 is characterized in that: The fixed pulley mechanism (4) further comprises two fixed pulley fixing plates (13) arranged at an interval, the fixed pulley (12) is mounted between the two fixed pulley fixing plates (13), a guide fixing plate (11) is fixed to the side of each of the two fixed pulley fixing plates (13), and the guide wheel (9) is fixed side by side between the two guide fixing plates (11).

5. The pull-down loading device for static testing of wind turbine blades according to claim 4 is characterized in that: A plurality of spacer plates (15) are vertically fixed between the guide fixing plates (11) on both sides. Two guide shafts (10) are arranged side by side between the two guide fixing plates (11). The two guide shafts (10) pass through all the spacer plates (15) and are fixed thereto. A guide wheel (9) is mounted on each guide shaft (10).

6. The pull-down loading device for static testing of wind turbine blades according to claim 4 is characterized in that: A connecting plate (8) is fixed between the two fixed pulley fixing plates (13), and a connecting hole for hanging a steel cable (27) is provided in the middle of the connecting plate (8).

7. The pull-down loading device for static testing of wind turbine blades according to claim 6 is characterized in that: A lug mechanism (5) is also provided on the side of the fixed pulley mechanism (4), and the lug mechanism (5) and the connecting plate (8) are respectively located on both sides of the fixed pulley (12).

8. The pull-down loading device for static testing of wind turbine blades according to claim 7 is characterized in that: The ear hook mechanism (5) comprises an ear hook base plate (19), on the surface of which two ear hook fixing plates (18) are vertically arranged, and the ear hook (16) for hooking with the steel cable (27) is movably mounted between the two ear hook fixing plates (18).

9. The pull-down loading device for static testing of wind turbine blades according to claim 1, characterized in that: The fixed pulley mechanism (4) is fixed on the surface of the base (2), and the base (2) and the power device are installed on the surface of the ground rail (1).

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