Fixture for fatigue test of wind power double-blade-root bolt sleeve

Abstract

The utility model relates to the field of testing tools, and discloses a wind power double-blade root bolt sleeve fatigue test clamp, which comprises an upper clamping unit, a sample and a lower clamping unit, the upper clamping unit comprises a lower connecting plate, the bottom end of the lower connecting plate is provided with a third round hole, the lower clamping unit is inserted into the bottom end of the third round hole, and the sample is arranged in the third round hole. The outer wall of the upper clamping unit is sleeved with a gasket, the outer wall of the sample 2 is in threaded connection with a second lock nut, an outer hexagonal long-rod bolt is inserted into the bottom end of the lower connecting plate, the outer wall of the outer hexagonal long-rod bolt is sleeved with an upper connecting plate, and the lower clamping unit comprises a bottom connecting plate. According to the utility model, the upper clamping unit is designed into a prison cage structure, so that the structural strength is firmer and more reliable, the stability of fixing the root of the sample can be improved, meanwhile, the lower clamping unit can adjust the position according to the sample to ensure the eccentricity of the sample, and the whole device is better in fixing effect and more convenient to use during use.

Description

Technical Field

[0001] The utility model relates to the field of testing tooling, in particular to a fixture for fatigue testing of wind turbine double-blade root bolt sleeves. Background Art

[0002] Wind energy, as a clean, renewable energy source, is gaining increasing attention worldwide. According to statistics, renewable energy consumption reached approximately 1.4 billion tons of oil equivalent in 2002 and is projected to exceed 2.2 billion tons by 2030. Wind power generation, the most technologically mature renewable energy source besides hydropower, accounts for the vast majority of total installed renewable energy capacity. Wind turbine blades, as a crucial component of wind turbines and connected to the rotor, must withstand millions of fatigue tests or fail to ensure proper operation.

[0003] Since the wind turbine blade itself is set to be arc-shaped and its appearance is asymmetrical, multiple sets of clamps are needed to fix it during testing, which is inconvenient and unstable. Therefore, a clamp for fatigue testing of wind turbine double blade root bolt sleeves is proposed to solve the above problems. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a fixture for fatigue testing of double-blade root bolt sleeves of wind turbines, which aims to improve the problem in the prior art that "the existing testing tooling requires multiple sets of tooling to fix the blades when in use, which is inconvenient and lacks stability during fixation."

[0005] The lockhole that is formed on the upper end of the hinge part is formed on the upper end of the hinge part, and the lockhole engages with the upper end of the chest that is formed on the chest of quenching the thirst of the user.

[0006] As a further description of the above technical solution:

[0007] The upper clamping unit also includes a double-headed screw, the bottom end of which is threadedly connected to a lock nut, the double-headed screw passes through and is slidably connected to the top end of the upper connecting plate, and the outer wall of the double-headed screw is sleeved with a locking ring.

[0008] As a further description of the above technical solution:

[0009] The outer wall of the external hexagonal long rod bolt is slidably connected with a cylindrical tube, the top end of the external hexagonal long rod bolt is threadedly connected with a hexagonal nut, and the bottom end of the lower connecting plate is installed with a baffle.

[0010] As a further description of the above technical solution:

[0011] A clamping bolt is inserted into the right end of the outer clamping plate, and the clamping bolt and the inner clamping plate are threadedly connected.

[0012] As a further description of the above technical solution:

[0013] The top of the locking ring is provided with a through hole, the bottom end of the locking ring is provided with a spiral inclined surface, the outer wall of the locking ring is provided with a circular hole, and the number is multiple. The locking ring is provided with two groups, and the two groups of locking rings both slide on the outer wall of the double-headed screw, and the two groups of locking rings face opposite directions.

[0014] As a further description of the above technical solution:

[0015] The top of the upper connecting plate is provided with a second circular hole, the top of the upper connecting plate is provided with a plurality of groups of first circular through holes, and the side of the upper connecting plate is provided with a hoisting hole.

[0016] As a further description of the above technical solution:

[0017] The top of the lower connecting plate is provided with a first threaded hole, and the top of the lower connecting plate is provided with a second round through hole in a plurality of groups.

[0018] As a further description of the above technical solution:

[0019] The top of the bottom connecting plate is provided with five circular through holes in multiple groups, the top of the bottom connecting plate is provided with a T-shaped slot, the top of the outer splint is provided with four circular through holes, the inner and outer splints have the same shape, the right end of the outer splint is provided with three circular through holes, and the right end of the inner splint is designed with two threaded holes.

[0020] The utility model has the following beneficial effects:

[0021] 1. In the present invention, the upper clamping unit is designed as a cage structure, so that the structural strength is more solid and reliable, and the stability of the root of the sample can be increased. At the same time, the lower clamping unit can adjust its own position according to the sample to ensure the eccentricity of the sample. The overall device has a better fixing effect and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the overall device in the utility model;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the upper clamping unit of the present invention;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the lower clamping unit of the utility model;

[0025] Figure 4 This is a schematic diagram of the three-dimensional structure of the locking ring in the utility model;

[0026] Figure 5 This is a schematic cross-sectional view of the three-dimensional structure of the upper connecting plate in the present invention;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the lower connecting plate of the utility model;

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the outer and inner plywood of the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the bottom connecting plate in the utility model.

[0030] Legend:

[0031] 1. Upper clamping unit; 11. Double-ended screw; 12. Locking ring; 121. Through hole 1; 122. Spiral bevel; 123. Round hole 1; 13. Upper connecting plate; 131. Round hole 2; 132. Round through hole 1; 133. Lifting hole; 14. Lock nut 1; 15. Hexagonal bolt with long rod; 16. Hexagonal nut; 17. Cylinder; 18. Lower connecting plate; 181. Round through hole 2; 182. Threaded hole one; 183, round hole three; 19, lock nut two; 20, gasket; 21, baffle; 2, specimen; 3, lower clamping unit; 30, outer clamping plate; 301, round through hole three; 302, round through hole four; 31, inner clamping plate; 311, threaded hole two; 32, clamping bolt; 33, fixing bolt; 34, T-nut; 35, bottom connecting plate; 351, T-slot; 352, round through hole five. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Reference Figure 1 、 Figure 2 and Figure 6 The present invention provides an embodiment of a wind turbine double-blade root bolt sleeve fatigue test fixture, comprising an upper clamping unit 1 for fixing the root of a specimen 2, the specimen 2, and a lower clamping unit 3 for fixing the bottom end of the specimen 2. The upper clamping unit 1 includes a lower connecting plate 18 for directly contacting the root of the specimen 2. A bolt is provided at the top of the specimen 2, and a circular hole 183 is provided at the bottom end of the lower connecting plate 18. The lower clamping unit 3 is inserted into the bottom end of the circular hole 183. The bolt at the bottom end of the specimen 2 passes through the circular hole 183, so that the specimen 2 can be inserted into the bottom end of the lower connecting plate 18. A gasket 20 is sleeved on the outer wall of the upper clamping unit 1. A lock nut 19 is threadedly connected to the outer wall of the specimen 2 for locking the specimen 2. An external hexagonal long-stem bolt 15 for positioning the upper connecting plate 13 is inserted at the bottom end of the lower connecting plate 18. The outer wall of the external hexagonal long-stem bolt 15 is sleeved on the upper connecting plate 13 for supporting the stud screw 11.

[0034] Reference Figure 1 、 Figure 3 、 Figure 8 The lower clamping unit 3 includes a bottom connecting plate 35 for supporting the entire lower clamping unit 3. The inner wall of the bottom connecting plate 35 is slidably connected with a T-nut 34 for supporting the fixing bolt 33. The top end of the T-nut 34 is threadedly connected with a fixing bolt 33 for supporting the outer clamping plate 30. The outer wall of the fixing bolt 33 is slidably connected with the outer clamping plate 30 for supporting the bottom end of the specimen 2. There are multiple groups of T-nuts 34 and fixing bolts 33. The outer wall of another group of fixing bolts 33 is slidably connected with an inner clamping plate 31 for squeezing the bottom end of the specimen 2. The bottom end of the specimen 2 is clamped in the middle position between the outer clamping plate 30 and the inner clamping plate 31. The left and right positions of the inner clamping plate 31 and the outer clamping plate 30 can be adjusted by adjusting the left and right positions of the fixing bolts 33 and the T-nut 34.

[0035] Reference Figure 2 - Figure 4The upper clamping unit 1 also includes a double-headed screw 11 for connecting the test equipment. The bottom end of the double-headed screw 11 is threadedly connected with a lock nut 14 for pulling the upper connecting plate 13. The double-headed screw 11 passes through and is slidably connected to the top end of the upper connecting plate 13. The outer wall of the double-headed screw 11 is sleeved with a locking ring 12 for preventing the connection between the double-headed screw 11 and the test equipment from loosening. The outer wall of the external hexagonal long rod bolt 15 is slidably connected with a cylindrical tube 17 for supporting the upper connecting plate 13. By setting the cylindrical tube 17, the distance between the upper connecting plate 13 and the lower connecting plate 18 can be limited. The top end of the external hexagonal long rod bolt 15 is threadedly connected with a hexagonal nut 16 for pulling the upper connecting plate 13. By screwing the hexagonal nut 16, the upper connecting plate 13, the lower connecting plate 18 and the cylindrical tube 17 can be driven to fit tightly. The bottom end of the lower connecting plate 18 is installed with a baffle 21 for further increasing the fixing stability.

[0036] Reference Figure 3 、 Figure 4 and Figure 7 The right end of the outer clamping plate 30 is inserted with a clamping bolt 32 for tightening the outer clamping plate 30 and the inner clamping plate 31. The clamping bolt 32 and the inner clamping plate 31 are threadedly connected. The outer clamping plate 30 and the inner clamping plate 31 are driven to move closer by rotating the clamping bolt 32. The top of the locking ring 12 is provided with a through hole 121 for the stud screw 11 to pass through, and the bottom end of the locking ring 12 is provided with a spiral inclined surface 122 for locking the stud screw 11. The outer wall of the locking ring 12 is provided with a circular hole 123 for facilitating the operator to rotate the locking ring 12, and the number is multiple. The locking ring 12 is provided with two groups, and the two groups of locking rings 12 slide on the outer wall of the stud screw 11, and the two groups of locking rings 12 face opposite directions. The working principle of the locking ring 12 is to lock the stud screw 11 by the tension generated by the mutual engagement of the spiral inclined surfaces 122 of the two groups of locking rings 12

[0037] Reference Figure 5 、 Figure 6 and Figure 8 The top of the upper connecting plate 13 is provided with a second round hole 131 for the stud screw 11 to pass through, the top of the upper connecting plate 13 is provided with a round through hole 132 for the hexagonal long rod bolt 15 to pass through, and the number is multiple groups, the side of the upper connecting plate 13 is provided with a lifting hole 133 for facilitating the lifting of the entire device, the top of the lower connecting plate 18 is provided with a threaded hole 182 for facilitating lifting, the top of the lower connecting plate 18 is provided with a second round through hole 181 for the hexagonal long rod bolt 15 to pass through, and the number is multiple groups.

[0038] Reference Figure 1 、 Figure 3 and Figure 8The top of the bottom connecting plate 35 is provided with five round through holes 352 for the passage of fixing bolts 33, and the number is multiple. By tightening the fixing bolts 33, the T-nuts 34 can be pulled to fix the inner splint 31 and the outer splint 30. The top of the bottom connecting plate 35 is provided with a T-slot 351 for accommodating the T-nuts 34, and the top of the outer splint 30 is provided with four round through holes 302 for the passage of fixing bolts 33. The inner splint 31 and the outer splint 30 have the same shape. The right end of the outer splint 30 is provided with three round through holes 301 for the passage of the clamping bolt 32, and the right end of the inner splint 31 is provided with two threaded holes 311 for cooperating with the clamping bolt 32. By tightening the clamping bolt 32, the inner splint 31 and the outer splint 30 can be driven close to each other to fix the specimen 2.

[0039] Working principle: When testing is required, the sample 2 and the upper clamping unit 1 can be connected first. At this time, the bolt at the root of the sample 2 needs to be used to penetrate the lower connecting plate 18, and then the sample 2 can be fixed by the lock nut 2 19 and the gasket 20. Then the stud screw 11 is used to penetrate the upper connecting plate 13, and the lock nut 14 is screwed to the bottom end of the stud screw 11. At this time, the hexagonal long rod bolt 15 can be used to penetrate the upper connecting plate 13 and the lower connecting plate 18, and the cylindrical tube 17 is used to limit the distance between the upper connecting plate 13 and the lower connecting plate 18. By tightening the hexagonal nut 16, the upper connecting plate 13, the cylindrical tube 17, and the lower connecting plate 18 can be driven to fit tightly. Finally, the baffle 21 can be installed to increase the stability of the fixation of the sample 2.

[0040] After the connection between the sample 2 and the upper clamping unit 1 is completed, the connection between the sample 2 and the lower clamping unit 3 can be started. At this time, the bottom end of the sample 2 needs to be inserted into the middle position of the outer clamping plate 30 and the inner clamping plate 31. Then, the outer clamping plate 30 and the inner clamping plate 31 can be driven closer to each other by rotating the clamping bolt 32 to fix the bottom end of the sample 2. When the bottom end of the sample 2 is fixed, the inner clamping plate 31 and the outer clamping plate 30 can be moved left and right to adjust the center position of the two groups of samples 2. When the centers are aligned, the inner clamping plate 31 and the outer clamping plate 30 can be fixed by screwing the fixing bolt 33.

[0041] After the upper clamping unit 1, the specimen 2, and the lower clamping unit 3 are all fixed, the two sets of locking rings 12 can be sleeved on the outer wall of the double-headed screw 11, and the double-headed screw 11 can be connected to the testing device through the external thread at the top of the double-headed screw 11. When the connection is completed, the locking ring 12 can be rotated through the circular hole 123 to increase the tightness of the connection between the double-headed screw 11 and the testing device.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fixture for fatigue testing of double blade root bolt sleeves of wind turbines, comprising an upper clamping unit (1), a specimen (2), and a lower clamping unit (3), characterized in that: The upper clamping unit (1) includes a lower connecting plate (18), the bottom end of the lower connecting plate (18) is provided with a circular hole three (183), the lower clamping unit (3) is plugged into the bottom end of the circular hole three (183), the outer wall of the upper clamping unit (1) is sleeved with a gasket (20), the outer wall of the sample (2) is threadedly connected with a lock nut two (19), the bottom end of the lower connecting plate (18) is inserted with an external hexagonal long rod bolt (15), the outer wall of the external hexagonal long rod bolt (15) is sleeved with the upper connecting plate (13), the lower clamping unit (3 ) includes a bottom connecting plate (35), the inner wall of the bottom connecting plate (35) is slidably connected to a T-nut (34), the top end of the T-nut (34) is threadedly connected to a fixing bolt (33), the outer wall of the fixing bolt (33) is slidably connected to an outer clamping plate (30), the T-nut (34) and the fixing bolt (33) are provided in multiple groups, the outer wall of another group of the fixing bolts (33) is slidably connected to an inner clamping plate (31), and the bottom end of the specimen (2) is clamped in the middle position between the outer clamping plate (30) and the inner clamping plate (31).

2. A fixture for fatigue testing of double blade root bolt sleeves for wind turbines according to claim 1, characterized in that: The upper clamping unit (1) also includes a double-headed screw (11), the bottom end of which is threadedly connected to a lock nut (14), the double-headed screw (11) passes through and is slidably connected to the top end of the upper connecting plate (13), and the outer wall of the double-headed screw (11) is sleeved with a locking ring (12).

3. A fixture for fatigue testing of wind turbine double blade root bolt sleeves according to claim 1, characterized in that: The outer wall of the hexagonal long rod bolt (15) is slidably connected to a cylindrical tube (17), the top end of the hexagonal long rod bolt (15) is threadedly connected to a hexagonal nut (16), and the bottom end of the lower connecting plate (18) is installed with a baffle (21).

4. A fixture for fatigue testing of wind turbine double blade root bolt sleeves according to claim 1, characterized in that: A clamping bolt (32) is inserted into the right end of the outer clamping plate (30), and the clamping bolt (32) and the inner clamping plate (31) are threadedly connected.

5. The fixture for fatigue testing of wind turbine double blade root bolt sleeves according to claim 2, characterized in that: The top end of the locking ring (12) is provided with a through hole (121), the bottom end of the locking ring (12) is provided with a spiral bevel (122), the outer wall of the locking ring (12) is provided with a plurality of groups of circular holes (123), and the locking ring (12) is provided with two groups. Both groups of locking rings (12) slide on the outer wall of the double-headed screw (11), and the two groups of locking rings (12) face opposite directions.

6. A fixture for fatigue testing of wind turbine double blade root bolt sleeves according to claim 1, characterized in that: The top of the upper connecting plate (13) is provided with a second circular hole (131), the top of the upper connecting plate (13) is provided with a plurality of groups of round through holes (132), and the side of the upper connecting plate (13) is provided with a hoisting hole (133).

7. The fixture for fatigue testing of wind turbine double blade root bolt sleeves according to claim 1, characterized in that: The top of the lower connecting plate (18) is provided with a threaded hole one (182), and the top of the lower connecting plate (18) is provided with a plurality of round through holes two (181).

8. The fixture for fatigue testing of wind turbine double blade root bolt sleeves according to claim 1, characterized in that: The top of the bottom connecting plate (35) is provided with a plurality of circular through holes (352), the top of the bottom connecting plate (35) is provided with a T-shaped slot (351), the top of the outer clamping plate (30) is provided with a circular through hole (302), the inner clamping plate (31) and the outer clamping plate (30) have the same shape, the right end of the outer clamping plate (30) is provided with a circular through hole (301), and the right end of the inner clamping plate (31) is provided with a threaded hole (311).

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