Deformation detection device for root section of wind power blade

Abstract

The invention relates to the technical field of wind power blade processing detection, in particular to a deformation detection device for the root section of a wind power blade. Comprising two distance measuring trolleys, a laser distance measuring instrument arranged on one distance measuring trolley and a laser reflecting plate arranged on the other distance measuring trolley. The distance measuring trolley comprises a trolley body capable of moving in the circumferential direction of a flange located at the root of the wind power blade and a bearing column used for bearing the laser distance measuring instrument or the laser reflecting plate. One end of each bearing column is provided with a guide head for entering a bolt hole, and the other end of each bearing column is used for fixing a corresponding laser range finder or laser reflecting plate; the vehicle body is provided with a radial elastic piece and an axial elastic piece which are connected with the bearing column, the axial elastic piece is used for extruding the bearing column, and the radial elastic piece is used for being matched with the axial elastic piece so that the part, close to the guide head, of the bearing column can enter the bolt hole to be positioned. According to the invention, the distance between any opposite bolt holes can be simply, conveniently and rapidly detected so as to comprehensively and accurately reflect the deformation of the root section of the wind power blade.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blade processing and detection, in particular to a deformation detection device for a root cross section of a wind turbine blade. Background Art

[0002] At a time when the wind power industry is booming, wind turbine blades are the core components of wind power generation systems, and their quality is directly related to the performance and safety of the entire power generation system. Among them, ensuring the accuracy of the cross-sectional circle at the root of wind turbine blades so that they perfectly match the wind turbine hub is a key quality control point in the manufacturing process of wind turbine blades. At present, the detection technology for the deformation of the cross-sectional circle at the root of wind turbine blades, whether traditional methods or emerging means, is constantly being explored and developed, but it also faces many challenges.

[0003] Traditionally, the circular deformation detection of the root section of wind turbine blades is mostly carried out using a special large-scale circular test fixture. The fixture is made according to the connection size of the hub at the root of the wind turbine, with an outer diameter of usually more than 4 meters, a radial length of about 150 mm, and bolt holes evenly distributed inside the ring, weighing up to about 1.5 tons. In actual testing, it is necessary to first use lifting equipment to lift the heavy circular test fixture, and with the close cooperation of multiple staff members, carefully insert and penetrate the bolt holes on the root of the blade test fixture and the root flange of the wind turbine blade one by one until all the overlapping bolt holes are connected with the connecting bolts once, and then the test is completed. This process not only consumes a lot of manpower, material resources and time, but also has extremely low detection efficiency. In addition, during the process of lifting and installing the fixture, there are safety risks such as heavy objects falling and personnel collisions, which pose a serious threat to the life safety of the staff. At the same time, due to the large size and complex operation of the fixture, the detection process is also easily interfered by environmental factors, making it difficult to guarantee the accuracy of the test results.

[0004] With the advancement of technology, some innovative detection methods have emerged, such as the wind turbine blade root cross-sectional circle deformation detection mechanism and detection method proposed in the patent with application number 202311164639.9. This technology sets an infrared probe on the positioning bolt, uses an infrared receiver to receive signals, and uses the central control unit to process and analyze data to determine whether the root cross-sectional circle of the blade is deformed. Although this method simplifies the detection process and improves the detection efficiency to a certain extent, it still exposes some problems in actual application.

[0005] On the one hand, it only measures the distances between a few specific groups of relative bolt holes, and cannot comprehensively and accurately obtain the distance data between all relative bolt holes. To achieve the measurement of the distances of all relative bolt holes, workers are required to insert the positioning bolts into all bolt holes in turn. However, the flange outer diameter of wind turbine blades is large, the number of bolt holes is large and densely distributed, and the operating space is very narrow. This requires workers to not only endure high-intensity physical labor during operation, but also the process is cumbersome and complicated, and operational errors are very likely to occur. What's more serious is that due to the presence of sharp components and complex mechanical structures around the flange, workers frequently shuttle back and forth in a small space, and it is very likely to cause accidents such as bumps and extrusions, posing a major safety hazard.

[0006] On the other hand, the positioning bolts in this technology rely on the elastic structure on the periphery to achieve a tight fit with the bolt hole. Although this design can ensure the fixation of the positioning bolts in the bolt holes, it is difficult to ensure that the infrared probe on the positioning bolts is precisely concentric with the bolt holes. In actual operation, when the positioning bolts are inserted into the bolt holes, the elastic structure will be deformed due to extrusion. This deformation will cause the position of the positioning bolts in the bolt holes to shift, and then the infrared probe will not be concentric with the bolt holes. The deviation of the infrared probe position will directly affect the accuracy of the signal received by the infrared receiver, resulting in errors in the positioning bolt position information obtained by the central control unit. As the errors accumulate, the final calculated spacing of the positioning bolts deviates greatly from the actual distance, which seriously affects the accuracy of the detection results and cannot provide reliable data support for the quality control of wind turbine blades. Summary of the invention

[0007] The present invention aims to provide a deformation detection device for a root cross section of a wind turbine blade, which can simply, conveniently and quickly detect the spacing between all relative bolt holes to comprehensively and accurately reflect the deformation of the root cross section of the wind turbine blade.

[0008] In order to solve the above technical problems, the specific scheme adopted by the present invention is: a deformation detection device for the root section of a wind turbine blade, comprising two ranging trolleys, a laser rangefinder arranged on one of the ranging trolleys, and a laser reflector arranged on the other ranging trolley; the ranging trolley comprises a vehicle body capable of moving circumferentially along a flange located at the root of the wind turbine blade and a bearing column for carrying the laser rangefinder or the laser reflector; the bearing column is distributed perpendicular to the flange and the outer diameter corresponds to the inner diameter of the bolt hole on the flange, one end of the bearing column is provided with a guide head for entering the bolt hole, and the other end is fixed to the corresponding laser rangefinder or laser reflector; the vehicle body is provided with a radial elastic member and an axial elastic member connected to the bearing column, the axial elastic member is used to squeeze the bearing column so that the guide head is tightly in contact with the flange surface or inserted into the bolt hole during the movement of the bearing column with the vehicle body, and the radial elastic member is used to cooperate with the axial elastic member after the guide head enters the bolt hole, so that the part of the bearing column close to the guide head enters the bolt hole to form a positioning.

[0009] Preferably, a through hole is provided on the vehicle body for the bearing column to pass through, and the hole diameter is larger than the outer diameter of the bearing column; a sleeve is fixedly provided on the vehicle body at the through hole, and the radial elastic member and the axial elastic member are both arranged between the sleeve and the bearing column.

[0010] Preferably, both the radial elastic parts and the axial elastic parts are springs and are respectively provided in plurality; the plurality of radial elastic parts are radially distributed with the bearing column as the center, the outer ends of the radial elastic parts are fixed on the inner wall of the sleeve, and the inner ends are fixedly connected to the outer wall of the same guide cylinder, the bearing column is fitted and slidably sleeved in the guide cylinder, and is positioned and matched by a keyway structure; one ends of the plurality of axial elastic parts are fixed on the flange provided at the end of the sleeve, and the other ends are fixed on a retaining ring fixed on the outer periphery of the bearing column.

[0011] Preferably, a reset mechanism is provided between the sleeve and the bearing column to counteract the thrust of the axial elastic member so as to allow the guide head to disengage from the bolt hole; the reset mechanism includes a first electromagnet fixed on the bearing column and a second electromagnet fixed in the sleeve, the first electromagnet and the second electromagnet are spaced apart and correspondingly distributed along the axial direction of the bearing column, and the first electromagnet and the second electromagnet are pushed and contacted by the axial elastic member to form an insertion depth limit for the bearing column to be inserted into the bolt hole.

[0012] Preferably, the vehicle body includes a U-shaped body with a half cover arranged on the outer periphery of the flange and a plate-shaped body located on the inner side of the root of the wind turbine blade. The U-shaped body is provided with rollers that rotate with the side edge and outer edge of the flange at intervals, and the plate-shaped body is provided with rollers that roll with the inner side of the root of the wind turbine blade.

[0013] Preferably, the U-shaped body and the plate-shaped body are detachably fixedly connected by screws.

[0014] Preferably, the wheel bodies of the rollers are made of rubber material.

[0015] Preferably, the roller transmission arranged on the plate-shaped vehicle body is connected to a driving motor.

[0016] Preferably, the guide head is semicircular or conical.

[0017] Preferably, the cross-section of the bearing column is circular or plum blossom-shaped.

[0018] Compared with the prior art, the present invention has the following beneficial effects.

[0019] Convenient and efficient detection method: The present invention sets two distance measuring trolleys that can move along the circumference of the flange at the root of the wind turbine blade, and uses a laser rangefinder and a laser reflector to measure the distance. Compared with traditional large-scale tooling detection, there is no need to hoist heavy tooling, and the operation is simpler. The distance measuring trolley can move flexibly and can quickly measure the distance between corresponding points of bolt holes in different positions, greatly improving the detection efficiency.

[0020] Accurate and reliable positioning: The outer diameter of the bearing column corresponds to the inner diameter of the bolt hole on the flange, and a guide head is provided to facilitate entry into the bolt hole. The axial elastic part and the radial elastic part cooperate with each other, so that the bearing column can be automatically and firmly positioned in the bolt hole after it moves roughly to the bolt hole with the vehicle body. Multiple radial elastic parts are distributed radially, and the bearing column can be positioned from multiple directions to ensure the accurate position of the bearing column in the bolt hole, thereby ensuring the stable position of the laser rangefinder and the laser reflector, and improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of the detection state of a deformation detection device for a root section of a wind turbine blade according to the present invention.

[0022] Figure 2 It is a schematic diagram of the matching state between the distance measuring trolley part and the root flange of the wind turbine blade in the present invention.

[0023] Figure 3 for Figure 2 Schematic diagram of the state after the load-bearing column part is inserted into the bolt hole.

[0024] Markings in the figure: 1. Distance measuring trolley, 101. Roller, 102. Plate-shaped trolley body, 103. Screw, 104. U-shaped trolley body, 2. Root of wind turbine blade, 3. Flange, 4. Bearing column, 5. Laser rangefinder, 6. Laser reflector, 7. Flanging, 8. Axial elastic part, 9. Sleeve, 10. Retaining ring, 11. First electromagnet, 12. Second electromagnet, 13. Support ring, 14. Radial elastic part, 15. Guide cylinder, 16. Bolt hole, 17. Guide head. DETAILED DESCRIPTION

[0025] like Figure 1As shown, a deformation detection device for a root section of a wind turbine blade of the present invention mainly comprises two distance measuring trolleys 1 which can move circumferentially along a flange 3 of a root section 2 of a wind turbine blade, wherein a laser distance meter 5 is arranged on one of the distance measuring trolleys 1, and a laser reflection plate 6 is arranged on the other distance measuring trolley 1. The laser distance meter 5 and the laser reflection plate 6 are automatically adjusted to be concentric with the bolt holes 16 so as to accurately measure the spacing between two relative bolt holes 16 on the flange 3. Furthermore, the distance measuring trolley 1 moves a full half circle along the flange 3, so as to measure the spacing between all relative bolt holes 16, so that personnel can compare the detection data with the design data to determine the deformation degree of the cross section of the root section 2 of the wind turbine blade.

[0026] like Figure 2 As shown, the distance measuring vehicle 1 includes a vehicle body and a bearing column 4 penetrating through a through hole opened on the vehicle body.

[0027] The vehicle body includes a U-shaped vehicle body 104 located on the left side and a plate-shaped vehicle body 102 located on the right side. A threaded hole is provided on the right side of the U-shaped vehicle body 104, and a through hole is provided on the plate-shaped vehicle body 102. After the through hole and the threaded hole are aligned, a screw 103 is screwed in to fix the U-shaped vehicle body 104 and the plate-shaped vehicle body 102. The U-shaped vehicle body 104 is covered on the outer periphery of the flange 3, and the plate-shaped vehicle body 102 is located on the inner side of the root 2 of the wind turbine blade. A plurality of rollers 101 are provided at intervals on the U-shaped vehicle body 104 and the plate-shaped vehicle body 102. The rollers 101 located on the plate-shaped vehicle body 102 are transmission-connected to a driving motor (not shown in the figure) fixed on the plate-shaped vehicle body 102, and form a driving wheel, while the rollers 101 provided on the U-shaped plate body are all driven wheels. The rims of all rollers 101 are made of elastic rubber material, so that after the U-shaped body 104 and the plate-shaped body 102 are fastened by screws 103, the rims of the driving wheel and the corresponding driven wheel (the roller 101 located at the outer edge of the flange 3) can be deformed to a certain extent to achieve a clamping effect, thereby enabling the body to move circumferentially along the flange 3 during the process of the driving motor driving the driving wheel to rotate. The remaining driven wheels rely on the structural specifications of the U-shaped plate body to be pressed against both sides of the flange 3 to produce a clamping effect, further improving the stability of the body moving along the flange 3.

[0028] A through hole is provided on the top of the flange 3 on the U-shaped body 104, and a sleeve 9 is fixed above the through hole. The top of the sleeve 9 is open to allow the bearing column 4 to pass through and enable the bearing column 4 to move along its own axial direction under the action of external force. The inner diameter of the sleeve 9 is larger than the outer diameter of the bearing column 4, so that the bearing column 4 can move laterally under the action of external force to automatically adapt to the bolt hole 16 on the flange 3.

[0029] The bearing column 4 is a straight column with a circular cross section, and its outer diameter corresponds to the inner diameter of the threaded hole on the flange 3 to be measured. The upper end of the bearing column 4 extends out of the sleeve 9 to provide a coaxial fixed installation for the detection matching reference of the laser rangefinder 5 and the laser reflector 6; a semicircular guide head 17 is fixedly provided at the lower end, so that when the bearing column 4 moves along the flange 3 with the vehicle body to the approximate position of the bolt hole 16, the guide head 17 can enter the bolt hole 16 first, and prepare for the subsequent bearing column 4 to enter the bolt hole 16 to complete the positioning. A retaining ring 10 is fixedly provided near the middle of the bearing column 4, and the upper edge of the retaining ring 10 is fixedly connected to a plurality of springs serving as axial elastic members 8, and the upper end of the spring is fixedly connected to the flange 7 provided at the top of the sleeve 9. The axial elastic member 8 is in a compressed state and has elastic potential energy to push the bearing column 4 downward. When the guide head 17 does not move to the bolt hole 16 with the vehicle body, it tightly contacts the upper edge of the flange 3. When the guide head 17 moves with the vehicle body to be roughly concentric with the bolt hole 16, it pushes the bearing column 4 downward and allows the guide head 17 to enter the bolt hole 16. A guide cylinder 15 is sleeved on the outer periphery of the end of the bearing column 4 close to the guide head 17. A plurality of springs serving as radial elastic members 14 are connected to the outer edge of the guide cylinder 15 at intervals in the circumferential direction. The outer ends of all radial elastic members 14 are respectively fixed on the sleeve 9. After the guide head 17 moves to the bolt hole 16 with the vehicle body and is pushed into the bolt hole 16 by the axial elastic member 8, the radial elastic member 14 can allow the bearing column 4 to adaptively adjust its own posture to be concentric with the bolt hole 16, so that the lower end portion of the bearing column 4 is pushed into the bolt hole 16 by the axial elastic member 8. At this time, if Figure 3 The laser rangefinder 5 and the laser reflector 6 respectively arranged at the upper end of the bearing column 4 are in a posture concentric with the corresponding bolt holes 16, so as to ensure the accuracy of the measurement.

[0030] The bearing column 4 and the guide cylinder 15 in this embodiment are matched by a keyway structure to prevent the bearing column 4 from rotating during the insertion process into the bolt hole 16, thereby ensuring that the laser emitted by the laser rangefinder 5 can accurately irradiate the laser reflection plate 6 to complete the distance measurement.

[0031] In order to achieve the reset of the bearing column 4 after completing the distance measurement of a group of relative bolt holes 16, a first electromagnet 11 is fixedly provided on the lower edge of the retaining ring 10, and a second electromagnet 12 is provided on the sleeve 9 below the first electromagnet 11. The second electromagnet 12 is fixed on the inner side of the annular support ring 13 welded on the inner wall of the sleeve 9, and a battery (not shown in the figure) for powering the first electromagnet 11 and the second electromagnet 12 is provided on the vehicle body. In the aforementioned distance measurement process, the first electromagnet 11 and the second electromagnet 12 are not powered. After the distance measurement is completed, the first electromagnet 11 and the second electromagnet 12 are respectively controlled to be powered so that the two generate a repulsive force against the axial elastic member 8, and the bearing column 4 is pushed up to the lower edge of the guide head 17 by the repulsive force and completely escaped from the bolt hole 16. After that, the vehicle body is controlled to move to stagger the bearing column 4 and the bolt hole 16 after the detection, and the power supply of the first electromagnet 11 and the second electromagnet 12 is disconnected again, that is, the bearing column 4 is pushed down again by the axial elastic member 8 and the guide head 17 is contacted with the flange 3 to complete the reset.

[0032] In addition, if Figure 3 As shown, when the lower end of the supporting column 4 is inserted into the bolt hole 16 for distance measurement, the first electromagnet 11 and the second electromagnet 12 contact to prevent the supporting column 4 from moving further downward, thereby forming a depth limit for the supporting column 4 inserted into the bolt hole 16, thereby ensuring that the longitudinal positions of the laser rangefinder 5 and the laser reflector plate 6 remain consistent during each group of distance measurement relative to the bolt hole 16, thereby ensuring the accuracy of the distance measurement.

[0033] Based on the above technical solution, the trial process of the present invention is as follows: first, Figure 1As shown, two distance measuring vehicles 1 are respectively installed on the flange 3 of the root 2 of the wind turbine blade, and the two bearing columns 4 are respectively located near the two opposite bolt holes 16. Then the two distance measuring vehicles 1 are started to move in the same direction along the circumference of the flange 3. After the bearing columns 4 on the two distance measuring vehicles 1 are roughly moved to be concentric with the bolt holes 16, that is, the circumferential elastic member and the radial elastic member 14 are respectively positioned and inserted into the two opposite bolt holes 16, and then the laser rangefinder 5 can be turned on to measure the distance and obtain the spacing between the two opposite bolt holes 16. After the distance measurement, the bearing column 4 is reset by the cooperation of the first electromagnet 11 and the second electromagnet 12. After the reset, the two distance measuring vehicles 1 are controlled to move in the same direction to the position close to the next group of opposite bolt holes 16 for distance measurement, and the distance measurement of all the opposite bolt holes 16 is completed by analogy. Finally, the distance measurement results are compared with the design requirements to draw conclusions on whether the cross-sectional circle of the root 2 of the wind turbine blade is deformed and whether it meets the assembly requirements. If the difference between the spacing of each set of relative bolt holes 16 and the design value is within ±3mm, it is determined that the cross-sectional circle of the root 2 of the wind turbine blade can meet the process requirements. If the difference between the spacing of at least one set of relative bolt holes 16 and the design value exceeds ±3mm, it means that the cross-sectional circle of the root 2 of the wind turbine blade is too deformed and cannot meet the process requirements.

Claims

1. A deformation detection device for the root section of a wind turbine blade, characterized in that: The invention comprises two distance measuring vehicles (1), a laser distance meter (5) arranged on one of the distance measuring vehicles (1), and a laser reflection plate (6) arranged on the other distance measuring vehicle (1); the distance measuring vehicle (1) comprises a vehicle body capable of circumferentially moving along a flange (3) located at the root of a wind turbine blade (2), and a bearing column (4) for bearing the laser distance meter (5) or the laser reflection plate (6); the bearing column (4) is arranged perpendicular to the flange (3) and has an outer diameter corresponding to the inner diameter of a bolt hole (16) on the flange (3); a guide head (17) for entering the bolt hole (16) is provided at one end of the bearing column (4); and a guide head (17) for entering the bolt hole (16) is provided at the other end of the bearing column (4). One end is used for fixing a corresponding laser rangefinder (5) or a laser reflector (6); a radial elastic member (14) and an axial elastic member (8) connected to the bearing column (4) are provided on the vehicle body; the axial elastic member (8) is used for squeezing the bearing column (4) so ​​that the guide head (17) is in close contact with the surface of the flange (3) or inserted into the bolt hole (16) when the bearing column (4) moves with the vehicle body; the radial elastic member (14) is used for cooperating with the axial elastic member (8) after the guide head (17) enters the bolt hole (16) so that the part of the bearing column (4) close to the guide head (17) enters the bolt hole (16) to form a positioning.

2. A deformation detection device for a root section of a wind turbine blade according to claim 1, characterized in that: The vehicle body is provided with a through hole for the bearing column (4) to pass through, and the hole diameter of the through hole is larger than the outer diameter of the bearing column (4); a sleeve (9) is fixedly provided on the vehicle body at the through hole, and a radial elastic member (14) and an axial elastic member (8) are both provided between the sleeve (9) and the bearing column (4).

3. A deformation detection device for a root section of a wind turbine blade according to claim 2, characterized in that: The radial elastic member (14) and the axial elastic member (8) are both springs and are respectively provided in plurality; the plurality of radial elastic members (14) are radially distributed with the bearing column (4) as the center; the outer ends of the radial elastic members (14) are fixed to the inner wall of the sleeve (9), and the inner ends are fixedly connected to the outer wall of the same guide cylinder (15); the bearing column (4) is fitted and slidably sleeved in the guide cylinder (15), and is positioned and matched by a keyway structure; one end of the plurality of axial elastic members (8) is fixed to a flange (7) provided at the end of the sleeve (9), and the other ends are fixed to a retaining ring (10) fixed to the outer periphery of the bearing column (4).

4. A deformation detection device for a root section of a wind turbine blade according to claim 2, characterized in that: A reset mechanism is provided between the sleeve (9) and the bearing column (4) for resisting the thrust of the axial elastic member (8) so as to cause the guide head (17) to escape from the bolt hole (16); the reset mechanism comprises a first electromagnet (11) fixed on the bearing column (4) and a second electromagnet (12) fixed in the sleeve (9); the first electromagnet (11) and the second electromagnet (12) are spaced and correspondingly distributed along the axial direction of the bearing column (4); the first electromagnet (11) and the second electromagnet (12) are pushed and contacted by the axial elastic member (8) to form an insertion depth limit for the bearing column (4) to be inserted into the bolt hole (16).

5. The deformation detection device for the root section of a wind turbine blade according to claim 1, characterized in that: The vehicle body comprises a U-shaped vehicle body (104) with a half cover arranged on the outer periphery of a flange (3) and a plate-shaped vehicle body (102) located on the inner side of a wind turbine blade root (2); rollers (101) rotatably matched with the side edge and outer edge of the flange (3) are arranged on the U-shaped vehicle body (104) at intervals, and rollers (101) rollingly matched with the inner side of the wind turbine blade root (2) are arranged on the plate-shaped vehicle body (102).

6. A deformation detection device for a root section of a wind turbine blade according to claim 5, characterized in that: The U-shaped vehicle body (104) and the plate-shaped vehicle body (102) are detachably fixedly connected via screws (103).

7. A deformation detection device for a root section of a wind turbine blade according to claim 5, characterized in that: The wheel body of the roller (101) is made of rubber material.

8. The deformation detection device for the root section of a wind turbine blade according to claim 5, characterized in that: The roller (101) arranged on the plate-shaped vehicle body (102) is transmission-connected to a driving motor.

9. The deformation detection device for the root section of a wind turbine blade according to claim 1, characterized in that: The guide head (17) is semicircular or conical.

10. The deformation detection device for the root section of a wind turbine blade according to claim 1, characterized in that: The cross section of the bearing column (4) is circular or plum blossom-shaped.

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