Box type fan blade static load test bench

Abstract

The utility model discloses a box type fan blade static load test bench, including bottom plate and setting up the base on bottom plate, the base includes the anchoring wall, the closed wall and the box type structure surrounded by two face stiff walls, the anchoring wall with closed wall is opposite and is provided in the first direction, and two face stiff wall is opposite and is provided in the second direction, and will anchoring wall with closed wall is connected, the side of closed wall is close to bottom plate and is provided with construction door hole, the anchoring wall is provided with mounting hole for installing fan blade and experimental motor. Through the base of the box type structure surrounded by the anchoring wall, the closed wall and two face stiff walls, setting up stiff wall and closed wall improves the cross section resisting moment of base, and the box type structure is formed to improve the bearing capacity of base bending and torsion resistance, and the construction door hole is set up on the closed wall, and the mounting hole is set up on the anchoring wall for installing fan blade and experimental motor, thereby more convenient for operating personnel to carry out construction.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine blade fixing technology, and in particular to a box-type wind turbine blade static load test bench. Background Technology

[0002] With the continuous development of new energy sources, wind turbine power generation is also constantly moving towards larger single-unit capacities, resulting in a continuous increase in the size of wind turbine blades. Before wind turbine blades are put into production and use, the blades need to undergo a large number of static and dynamic load tests on a test bench.

[0003] In wind turbine blade test rigs, the base is typically used as the connection point between the blade and the test rig, anchoring the blade root to the base. The load on the blade is controlled by adjusting the displacement of the motor. Therefore, the base is the area on the entire test rig that bears the most concentrated test load. However, with the increasing size of new wind turbine blades, a base structure that is both structurally sound and easy to construct is needed to withstand combined compression, bending, shear, and torsion loading. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a static load test bench for box-type wind turbine blades, which improves the bending and torsional bearing capacity of the base and facilitates construction.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A box-type wind turbine blade static load test bench includes a base plate and a base disposed on the base plate; The base includes an anchoring wall, a closed wall, and a box-shaped structure enclosed by two stiffening walls; The anchoring wall and the closing wall are arranged opposite each other in the first direction, and the two stiffening walls are arranged opposite each other in the second direction, connecting the anchoring wall and the closing wall; A construction doorway is provided on the side of the enclosed wall closest to the base slab; The anchoring wall is provided with mounting holes for installing fan blades and experimental motors.

[0006] Furthermore, the base also includes a cantilever wall; the cantilever wall is connected to the stiffening wall, and the cantilever wall and the closed wall are arranged on the same plane; the thickness and height of the cantilever wall are the same as the thickness and height of the closed wall.

[0007] Furthermore, the length of the cantilever wall is no greater than a preset value; the preset value is one-quarter of the shortest distance from the outer side of the stiffening wall to the symmetrical plane of the two stiffening walls.

[0008] Furthermore, the construction doorway is located on the central axis along the length of the enclosed wall; the distance from the top surface of the construction doorway to the top surface of the enclosed wall is not less than twice the thickness of the stiffening wall.

[0009] Furthermore, the distance from the end of the stiffening wall away from the anchoring wall to the anchoring wall is 1 / 3 to 1 / 2 of the height of the anchoring wall.

[0010] Furthermore, the outer side of the anchoring wall forms an angle of 65°-80° with the plane of the base plate; The central axis of the mounting hole forms an angle of 10°-25° with the plane of the base plate.

[0011] Furthermore, it also includes two sets of prestressed components and two sets of prestressing tendons; each set of prestressed components includes two fasteners; one fastener of the first set of prestressed components is disposed on the top side of the junction of the stiffening wall and the closed wall, and the other fastener is disposed in the base plate; the prestressing tendons of the first set pass through the base and the base plate to connect the two fasteners; the two fasteners of the second set of prestressed components are respectively disposed on the front and rear sides of the base, and the prestressing tendons of the second set pass through the anchor wall, the stiffening wall and the closed wall in sequence to connect the two fasteners.

[0012] Furthermore, the fixing element includes an anchor block and a fixing anchor; the anchor block is disposed on the surface of the base; the fixing anchor is disposed within the anchor block, within the base, or within the bottom plate; two oppositely disposed fixing anchors are connected by the prestressed tendons.

[0013] Furthermore, the anchor block includes a steel plate and anchoring bars; the steel plate is disposed on the surface of the base; one end of the anchoring bars passes through the steel plate and is connected to the base.

[0014] The beneficial effects of this utility model are as follows: the base is formed by anchoring walls, closed walls and two stiffening walls to form a box-shaped structure. The stiffening walls and closed walls increase the cross-sectional modulus of the base, and the box-shaped structure improves the bending and torsional bearing capacity of the base. At the same time, a construction door opening is provided on the upper part of the closed wall and an installation hole is provided on the anchoring wall for installing fan blades and experimental motors, which makes it more convenient for workers to carry out construction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a box-type wind turbine blade static load test bench according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the usage structure of a box-type wind turbine blade static load test bench in an embodiment of this utility model; Figure 3This is a side cross-sectional view of a box-type wind turbine blade static load test bench according to an embodiment of the present invention; Figure 4 This is a top view of a static load test bench for box-type wind turbine blades according to an embodiment of the present utility model. Figure 5 This is a side view of a static load test bench for box-type wind turbine blades according to an embodiment of the present invention. Figure 6 This is a front view structural schematic diagram of a box-type wind turbine blade static load test bench according to an embodiment of the present utility model; Figure 7 This is a top view of the fixing component of a box-type wind turbine blade static load test bench according to an embodiment of the present utility model; Figure 8 This is a side view of the fixing component of a box-type wind turbine blade static load test bench according to an embodiment of the present utility model; Figure 9 This is a schematic diagram of the bellows arrangement of a box-type wind turbine blade static load test bench in an embodiment of the present utility model. Figure 10 This is a side view of the anchor bolt cage installation truss of a box-type wind turbine blade static load test bench according to an embodiment of the present utility model. Figure 11 This is a front view of the anchor bolt cage installation truss of a box-type wind turbine blade static load test bench according to an embodiment of this utility model; Label Explanation: 1. Base plate; 2. Foundation; 21. Anchor wall; 22. Enclosed wall; 23. Stiffening wall; 24. Cantilever wall; 25. Construction doorway; 26. Installation hole; 27. Anchor bolt hole group; 3. Prestressed components; 31. Fasteners; 311. Anchor blocks; 3111. Steel plates; 3112. Anchoring bars; 312. Fixing anchors; 4. Prestressed tendons; 5. Anchor bolt cage installation truss; 6. Cable tie device; 7. Vertical corrugated pipe; 8. Horizontal corrugated pipe. Detailed Implementation

[0016] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0017] A box-type static load test bench for wind turbine blades includes a base plate and a base disposed on the base plate; the base includes a box-shaped structure formed by an anchor wall, a closed wall, and two stiffening walls; the anchor wall and the closed wall are arranged opposite to each other in a first direction, and the two stiffening walls are arranged opposite to each other in a second direction, connecting the anchor wall and the closed wall; a construction doorway is provided on the side of the closed wall near the base plate; the anchor wall is provided with mounting holes for mounting wind turbine blades and test motors.

[0018] As can be seen from the above description, the beneficial effects of this utility model are as follows: the base, which is formed by anchoring walls, closed walls and two stiffening walls, is a box-shaped structure. The stiffening walls and closed walls increase the cross-sectional modulus of the base, and the box-shaped structure improves the bending and torsional bearing capacity of the base. At the same time, a construction doorway is provided on the upper part of the closed wall, and an installation hole is provided on the anchoring wall for installing fan blades and experimental motors, which makes it more convenient for workers to carry out construction.

[0019] Furthermore, the base also includes a cantilever wall; the cantilever wall is connected to the stiffening wall, and the cantilever wall and the closed wall are arranged on the same plane; the thickness and height of the cantilever wall are the same as the thickness and height of the closed wall.

[0020] As described above, by setting cantilevered walls with the same thickness and height as the closed wall on the left and right sides of the base, and placing the cantilevered walls and the closed wall on the same plane, the cross-sectional modulus of the base is increased, thereby further improving the load-bearing capacity of the base.

[0021] Furthermore, the length of the cantilever wall is not greater than a preset value; the preset value is one-quarter of the shortest distance from the outer side of the stiffening wall to the symmetrical plane of the two stiffening walls.

[0022] As described above, by calculating and limiting the length of the cantilever wall, the problem of the cantilever wall being too long and unable to effectively bear the cross-sectional modulus moment, or even leading to a decrease in load-bearing capacity, can be avoided.

[0023] Furthermore, the construction doorway is located on the central axis along the length of the enclosed wall; the distance from the top surface of the construction doorway to the top surface of the enclosed wall is not less than twice the thickness of the stiffening wall.

[0024] As can be seen from the above description, by limiting the height of the construction opening, the problem of the base's bending and torsional resistance decreasing due to the excessive size of the construction opening, thus failing to effectively provide load-bearing capacity for the wind turbine blades, can be avoided.

[0025] Furthermore, the distance from the end of the stiffening wall away from the anchoring wall to the anchoring wall is 1 / 3 to 1 / 2 of the height of the anchoring wall.

[0026] As described above, by setting the distance from the stiffening wall away from the blade end to the anchor wall to 1 / 3 to 1 / 2 of the anchor wall height, the specific dimensions of the distance can conform to the calculation results of the bending and torsional bearing capacity of the base under static load, thereby improving the stress performance of the base.

[0027] Furthermore, the outer side of the anchoring wall forms an angle of 65°-80° with the plane of the base plate; the central axis of the mounting hole forms an angle of 10°-25° with the plane of the base plate.

[0028] As described above, by forming an angle of 65°-80° between the plane of the anchor wall and the plane of the base plate, and an angle of 10°-25° between the central axis of the mounting hole and the plane of the base plate, the mounting surface of the anchor wall is tilted upwards. Since the wind turbine blades oscillate back and forth during testing, tilting the mounting surface of the anchor wall upwards allows the wind turbine blades to tilt upwards during installation, reducing the height of the base and thus lowering costs. At the same time, compared to dynamic loads, the blades experience greater forces under static loads, resulting in a greater degree of blade drooping. Therefore, the base needs to be set at a relatively large angle to allow the blades to initially tilt upwards to a higher height, preventing the blades from hitting the ground after drooping.

[0029] Furthermore, it also includes two sets of prestressed components and two sets of prestressing tendons; each set of prestressed components includes two fasteners; one fastener of the first set of prestressed components is disposed on the top side of the junction of the stiffening wall and the closed wall, and the other fastener is disposed in the base plate; the prestressing tendons of the first set pass through the base and the base plate to connect the two fasteners; the two fasteners of the second set of prestressed components are respectively disposed on the front and rear sides of the base, and the prestressing tendons of the second set pass through the anchor wall, the stiffening wall and the closed wall in sequence to connect the two fasteners.

[0030] As described above, by setting stiffening walls and closed walls to increase the cross-sectional modulus of the base, and further by setting two sets of prestressed components and two sets of prestressed tendons, the fatigue resistance and crack resistance of the base are improved in both the vertical and longitudinal directions, resulting in good overall mechanical properties of the base and thus enhancing the overall load-bearing capacity of the structure.

[0031] Furthermore, the fixing element includes an anchor block and a fixing anchor; the anchor block is disposed on the surface of the base; the fixing anchor is disposed within the anchor block, within the base, or within the bottom plate; two oppositely disposed fixing anchors are connected by the prestressed tendons.

[0032] As can be seen from the above description, by using anchor blocks and fixed anchors to fix the prestressing tendons, the installation of prestressing tendons under different installation requirements can be met.

[0033] Furthermore, the anchor block includes a steel plate and anchoring bars; the steel plate is disposed on the surface of the base; one end of the anchoring bars passes through the steel plate and is connected to the base.

[0034] As described above, by using steel plates and anchoring steel bars to form anchor blocks, the steel plates can be placed on the surface of the base and then fixed by anchoring steel bars. This effectively places the steel plates on the surface of the base, thereby fixing the anchors.

[0035] The static load fixing device for wind turbine blades provided by this utility model can be applied to scenarios where wind turbine blades are fixed by static load. The following is a description of the specific implementation method: Example 1 Please refer to Figures 1 to 6 A box-type wind turbine blade static load test bench includes a base plate 1 and a base 2 mounted on the base plate 1. The base 2 includes a box-shaped structure formed by anchor walls 21, closed walls 22, and two stiffening walls 23. The anchor walls 21, closed walls 22, and stiffening walls are reinforced concrete structures, and the four walls together form the main body of the base 2. In other optional embodiments, a fiber-reinforced concrete structure is used to increase the crack resistance of the base 2. A cable tie device 6 is also provided on the base plate 1; the cable tie device 6 is used to connect to the wind turbine blade.

[0036] Anchor wall 21 and sealing wall 22 are arranged opposite each other in a first direction, which is the installation direction of the fan blades. Two stiffening walls 23 are arranged opposite each other in a second direction and connect anchor wall 21 and sealing wall 22. That is, stiffening walls 23 are arranged on both sides behind anchor wall 21 and are located on two opposite sides of fan blades. At the same time, the distance from the end of stiffening wall 23 away from anchor wall 21 to anchor wall 21 is 1 / 3 to 1 / 2 of the height of anchor wall 21.

[0037] Please refer to Figure 3 A construction doorway 25 is provided on the side of the closed wall 22 near the base plate 1; the construction doorway 25 is located on the central axis of the length direction of the closed wall 22, and the length direction is the second direction; that is, the construction doorway 25 is located in the middle of the two stiffening walls 23; and the distance from the top surface of the construction doorway 25 to the top surface of the closed wall 22 is not less than twice the thickness of the stiffening wall 23.

[0038] The anchor wall 21 is provided with mounting holes 26 for mounting fan blades and experimental motors. The outer surface of the anchor wall 21 forms an angle of 65°-80° with the plane of the base plate 1; the central axis of the mounting hole 26 forms an angle of 10°-25° with the plane of the base plate 1. Figure 5 As shown, mounting hole 26 is a single hole located in the center of anchor bolt hole group 27; anchor bolt hole group 27 is a ring array of several evenly distributed circular holes, the geometric center of which coincides with the geometric center of anchor wall 21, and the hole shape is set according to actual experimental requirements. When installing the wind turbine blades, the anchor bolt cage at the root of the wind turbine blades is passed through anchor bolt hole group 27 to anchor the wind turbine blades to the base 2.

[0039] In an optional embodiment, the base 2 further includes a cantilever wall 24; the cantilever wall 24 is connected to the stiffening wall 23, and the cantilever wall 24 and the closing wall 22 are located on the same plane; the thickness and height of the cantilever wall 24 are the same as the thickness and height of the closing wall 22; that is, the cantilever wall 24 extends outward from the outer surface of the stiffening wall 23 along the plane where the closing wall 22 is located. The length of the cantilever wall 24 is not greater than a preset value; the preset value is one-quarter of the shortest distance from the outer side of the stiffening wall 23 to the symmetrical plane of the two stiffening walls 23; specifically, the formula is: d≤Sn / 4; where d represents the length of the cantilever wall 24, and Sn represents the shortest distance from the outer side of the stiffening wall 23 to the symmetrical plane of the two stiffening walls 23. Whether to provide the cantilever wall 24 needs to be determined based on the calculation results of the closing wall 22 according to the requirements of the base 2.

[0040] Please refer to Figure 4 and Figure 5 The base 2 is also equipped with a bidirectional prestressing system consisting of a longitudinal prestressing system and a vertical prestressing system. The vertical prestressing system is vertically installed at the top of the stiffening wall 23 away from the wind turbine blades and at the top of the enclosed wall 22. If the base 2 is equipped with an overhanging wall 24, it is simultaneously installed at the top of the stiffening wall 23, the enclosed wall 22, and the overhanging wall 24. The longitudinal prestressing system is parallel to the ground and is longitudinally installed at both ends of the upper part of the stiffening wall 23. Specifically: The base 2 includes two sets of prestressed components 3 and two sets of prestressing tendons 4. Each set of prestressed components 3 includes two fasteners 31. One fastener 31 of the first set of prestressed components 3 is located on the top side of the junction of the stiffening wall 23 and the closing wall 22, and the other fastener 31 is located inside the base plate 1. If the base 2 is provided with an overhanging wall 24, the fastener 31 is located at the top of the stiffening wall 23, the closing wall 22, and the overhanging wall 24. The first set of prestressing tendons 4 passes through the base 2 and the base plate 1 to connect the two fasteners 31. The prestressing tendons 4 are composed of 2-10 bundles of prestressed steel strands or prestressed anchor bolts. The two fasteners 31 of the second set of prestressed components 3 are respectively located on the front and rear sides of the base 2, and the second set of prestressing tendons 4 passes through the anchoring wall 21, the stiffening wall 23, and the closing wall 22 in sequence to connect the two fasteners 31.

[0041] Please refer to Figure 7 as well as Figure 8The fixing component 31 includes an anchor block 311 and a fixing anchor 312; the anchor block 311 is disposed on the surface of the base 2; the fixing anchor 312 is disposed within the anchor block 311, within the base 2, or within the bottom plate 1; two opposing fixing anchors 312 are connected by prestressed tendons 4. The anchor block 311 is a reinforced concrete structure, including a steel plate 3111 and anchoring reinforcing bars 3112; the steel plate 3111 is disposed on the surface of the base 2; one end of the anchoring reinforcing bar 3112 passes through the steel plate 3111 and connects to the base 2; for example, one end of the anchoring reinforcing bar 3112 is welded to the steel plate 3111, and the remaining part is embedded in the structure of the base 2. Figure 4 As shown, the top of the base 2 is provided with two sets of anchor blocks 311. Steel plates 3111 are set on the upper surfaces of the stiffening wall 23, the closed wall 22, and the cantilever wall 24, and anchor bars 3112 penetrate through the stiffening wall 23, the closed wall 22, and the cantilever wall 24. Simultaneously, steel plates 3111 are also provided at both the front and rear ends of the upper part of the two stiffening walls 23. The anchor bars 3112 at the front end penetrate through the anchor wall 21 and the stiffening wall 23, and the anchor bars 3112 at the rear end penetrate through the closed wall 22 and the stiffening wall 23. The number of fixed anchors 312 and prestressed tendons 4 can be set according to the actual situation.

[0042] The construction method of the above-mentioned static load test bench for box-type wind turbine blades includes: S1. Embed fasteners 31 within the foundation slab and install prestressed tendons 4 corrugated pipes; please refer to... Figure 9 That is, the base 2 vertical reinforcement anchorage section is configured in the base slab foundation, and the anchorage of the fixed section of the pre-embedded vertical prestressed tendon 4 and the vertical corrugated pipe 7 of the base slab section are connected.

[0043] S2. Pour concrete into the foundation slab and complete curing to form foundation slab 1; S3. Install the anchor cage installation truss 5 on the base plate 1; hoist the steel structure truss required for the anchor cage into place using equipment.

[0044] S4. Install the prestressed steel strands and transverse corrugated pipes of the static load test bench; S5. Tie and fix the reinforcing bars of base 2 in layers, and install and fix the steel formwork of the construction duct; S6. Construction of the cylindrical central section from the bottom surface of base plate 1 to the anchor bolt cage installation truss 5; such as Figure 10 and Figure 11 As shown, the installation method of the anchor bolt cage truss 5 and the base plate 1 is illustrated.

[0045] S7. Construction of the section from the center of the cylinder of the anchor bolt cage installation truss 5 to the top section of the anchor bolt cage installation truss 5. S8. Construction of the top section of the anchor bolt cage truss 5 to the top area of ​​the base 2, followed by curing and formwork removal. S9. Set two sets of prestressed components 3 and connect them to two sets of prestressed tendons 4; S10. Tensile the two sets of prestressed tendons 4 alternately according to the preset tensioning sequence, so that the prestress of the two sets of prestressed tendons 4 reaches 30%, 60% and 100% of the specified tensioning stress in sequence; For example, in the order of first longitudinal and then vertical, the prestressing tendons 4 are alternately tensioned to 30% of the specified tension stress; then in the same order, the prestressing tendons 4 are alternately tensioned to 60% of the specified tension stress; finally, in the same order, the prestressing tendons 4 are alternately tensioned to 100% of the specified tension stress.

[0046] In summary, the box-type wind turbine blade static load test bench provided by this utility model, through the anchor wall, closed wall, and two stiffening walls forming a box-shaped base, increases the cross-sectional modulus of the base by the stiffening and closed walls, while the box-shaped structure enhances the base's bending and torsional load-bearing capacity. Simultaneously, the base utilizes a fiber-reinforced concrete structure, increasing its crack resistance. A construction doorway is provided near the top of the closed wall, and mounting holes are provided in the anchor wall for installing wind turbine blades and the test motor, thus facilitating construction. Furthermore, the mounting hole angle is set at 10°-25°, allowing the wind turbine blades to initially tilt upwards to a higher height, preventing them from drooping and hitting the ground, thus avoiding damage. The prestressed tendons not only improve the base's fatigue and crack resistance but also reduce the amount of reinforcing steel required, making construction easier.

[0047] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A static load test bench for box-type wind turbine blades, characterized in that, Includes a base plate and a base disposed on the base plate; The base includes an anchoring wall, a closed wall, and a box-shaped structure enclosed by two stiffening walls; The anchoring wall and the closing wall are arranged opposite each other in the first direction, and the two stiffening walls are arranged opposite each other in the second direction, connecting the anchoring wall and the closing wall; A construction doorway is provided on the side of the enclosed wall closest to the base slab; The anchoring wall is provided with mounting holes for installing fan blades and experimental motors.

2. The static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The base also includes a cantilevered wall; The cantilever wall is connected to the stiffening wall, and the cantilever wall and the closed wall are arranged on the same plane; The thickness and height of the cantilever wall are the same as those of the closed wall.

3. The static load test bench for box-type wind turbine blades according to claim 2, characterized in that, The length of the cantilevered wall shall not exceed a preset value; The preset value is one-quarter of the shortest distance from the outer side of the stiffening wall to the symmetrical plane of the two stiffening walls.

4. The static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The construction portal is located on the central axis along the length of the enclosed wall; The distance from the top surface of the construction portal to the top surface of the enclosed wall is not less than twice the thickness of the stiffening wall.

5. The static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The distance from the end of the stiffening wall away from the anchor wall to the anchor wall is 1 / 3 to 1 / 2 of the height of the anchor wall.

6. The static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The outer side of the anchoring wall forms an angle of 65°-80° with the plane of the base plate; The central axis of the mounting hole forms an angle of 10°-25° with the plane of the base plate.

7. The static load test bench for box-type wind turbine blades according to claim 1, characterized in that, It also includes two sets of prestressed components and two sets of prestressed tendons; Each set of the prestressed components includes two fasteners; One of the fasteners of the first group of prestressed components is located on the top side of the junction between the stiffening wall and the closed wall, and the other fastener is located inside the bottom plate; The first set of prestressed tendons penetrates the base and the bottom plate to connect the two fasteners; The two fasteners of the second set of prestressed components are respectively disposed on the front and rear sides of the base, and the prestressed tendons of the second set pass through the anchor wall, stiffening wall and closing wall in sequence to connect the two fasteners.

8. The static load test bench for box-type wind turbine blades according to claim 7, characterized in that, The fastener includes an anchor block and a fixing anchor. The anchor block is disposed on the surface of the base; The fixed anchor is disposed within the anchor block, the base, or the bottom plate; The two opposing fixed anchors are connected by the prestressed tendons.

9. The static load test bench for box-type wind turbine blades according to claim 8, characterized in that, The anchoring block includes a steel plate and anchoring steel bars; The steel plate is disposed on the surface of the base; One end of the anchoring steel bar passes through the steel plate and is connected to the base.

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