A method and device for segmented angle measurement to prevent blades from sweeping the tower, and a fan

Abstract

The present invention discloses a method and device for preventing blade tower sweep by segmented rotation angle measurement, and a wind turbine. The method comprises: arranging n connecting rods on the blade web along the direction from the blade root to the blade tip, with the connecting rods all being parallel to the blade root; measuring and calculating the rotation angle at the location of each connecting rod; calculating the x-direction deformation of each segment between the connecting rods on the blade to obtain the x-direction deformation of the blade; judging the difference between the x-direction deformation of the blade and a preset maximum x-direction deformation, and determining that when the x-direction deformation of the blade is greater than the preset maximum x-direction deformation, the blade pitch is changed to prevent blade tower sweep. Connecting rods are installed on the blade web, and by measuring the rotation angle of the connecting rods, the distance moved along the x-direction by the blade tip from the initial position to the measurement position is calculated. The obtained blade tip movement distance is compared with the preset maximum x-direction deformation. When the maximum horizontal deformation of the blade is greater than the preset maximum deformation, the blade pitch is changed to prevent blade tower sweep.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a method and device for segmented angle measurement to prevent blades from sweeping a tower, and a wind turbine. Background Art

[0002] With the development of larger wind turbines, the length of wind turbine blades from the manhole plate to the blade tip is getting longer and longer. However, since the blades are flexible parts, the longer the blades are, the greater their deformation will be, and there may even be a risk of tower sweeping.

[0003] The manhole plate is a crucial component of wind turbine blades. Installed inside the blade's root, it prevents debris from entering the casing and features a circular hole for access during blade maintenance and inspection. The blade tip is the end of the blade away from the manhole plate. The web, also known as the internal beam, primarily supports the blade's outer shell and bears the bending loads. It often utilizes an I-beam structure to reduce weight.

[0004] How to prevent the problem of blades sweeping the tower to ensure the safe use of the blades is an urgent problem to be solved by people in this technical field. Summary of the Invention

[0005] In view of this, the present invention provides a method for preventing blade sweeping by segmented rotation angle measurement, thereby preventing the problem of blade sweeping and ensuring the safe use of the blades. In addition, the present invention also provides a device for preventing blade sweeping by segmented rotation angle measurement and a fan.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for preventing blade sweeping by segmented rotation angle measurement, comprising:

[0008] n connecting rods are arranged on the blade web of the blade in the direction from the blade root to the blade tip, and the connecting rods are all parallel to the plane where the blade root is located;

[0009] measuring and calculating the rotation angle of each connecting rod;

[0010] Calculating the x-direction deformation of each segment between the connecting rods on the blade, and calculating the x-direction deformation of the blade;

[0011] The difference between the x-direction deformation of the blade and the preset maximum x-direction deformation is determined. When it is determined that the x-direction deformation of the blade is greater than the preset maximum x-direction deformation, the blade pitch is changed to prevent the blade from sweeping the tower.

[0012] Preferably, in the above-mentioned method of measuring the segmented rotation angle to prevent blade sweeping, the measuring and calculating of the rotation angle at the location of each connecting rod includes:

[0013] Obtaining the instantaneous angle of the position of the connecting rod and the initial angle of the position of the connecting rod relative to the y direction;

[0014] Calculate the instantaneous rotation angle value of the connecting rod Δθi=θLi-θ0i; and calculate the rotation angle of the connecting rod relative to the y direction Where θLi is the instantaneous angle of the i-th connecting rod, and θ0i is the initial angle of the i-th connecting rod relative to the y direction.

[0015] Preferably, in the above-mentioned method of measuring the segmented rotation angle to prevent blade sweep, the calculation of the x-direction deformation of each segment between the connecting rods on the blade and the calculation of the x-direction deformation of the blade include:

[0016] Calculate the distance between adjacent connecting rods on the blade web: ΔLi = S i+1 -S i , where S i is the distance from the i-th connecting rod to the blade root, S i+1 is the distance from the i+1th connecting rod to the blade root;

[0017] And calculate the distance between the connecting rod near the blade tip and the blade tip, ΔLn=L0-S n , where L0 is the distance from the blade root to the blade tip, S n is the distance from the nth connecting rod to the blade root;

[0018] Calculate the deformation of each segment of the connecting rod on the blade web along the x direction ΔXi = ΔLi*sin(θisum-β1-β2), and calculate the deformation of the blade tip along the x direction Wherein, β1 is the cone angle at the hub when the blade is installed, β2 is the inclination angle of the nacelle main shaft when the blade is installed, θisum is the rotation angle of the position of the i-th connecting rod relative to the y direction, and S1 is the distance from the blade root to the nearest connecting rod.

[0019] A device for measuring segmented rotation angles to prevent blades from sweeping a tower, comprising:

[0020] Connecting rods: n connecting rods are arranged on the blade web along the direction from the blade root to the blade tip, and the connecting rods are all parallel to the plane where the blade root is located;

[0021] An angle sensor, used to obtain the instantaneous angle of the position of the connecting rod and the initial angle of the position of the connecting rod relative to the y direction;

[0022] A data collector is connected to the angle sensor and can calculate the instantaneous rotation angle value of the connecting rod Δθi=θLi-θ0i; and calculate the rotation angle of the connecting rod relative to the y direction. Where θLi is the instantaneous angle of the position of the i-th connecting rod, and θ0i is the initial angle of the position of the i-th connecting rod relative to the y direction;

[0023] Calculate the distance between adjacent connecting rods on the blade web: ΔLi = S i+1 -S i , where S i is the distance from the i-th connecting rod to the blade root, S i+1 is the distance from the i+1th connecting rod to the blade root;

[0024] And calculate the distance between the connecting rod near the blade tip and the blade tip, ΔLn=L0-S n , where L0 is the distance from the blade root to the blade tip, S n is the distance from the nth connecting rod to the blade root;

[0025] Calculate the deformation of each segment of the connecting rod on the blade web along the x direction ΔXi = ΔLi*sin(θisum-β1-β2), and calculate the deformation of the blade tip along the x direction Where β1 is the cone angle at the hub when the blade is installed, β2 is the inclination angle of the nacelle main shaft when the blade is installed, θisum is the rotation angle of the i-th connecting rod relative to the y direction, and S1 is the distance from the blade root to the nearest connecting rod;

[0026] The controller is used to determine the difference between the x-direction deformation of the blade tip calculated by the data collector and the preset maximum x-direction deformation, and when it is determined that the x-direction deformation of the blade tip is greater than the preset maximum x-direction deformation, the blade pitch is changed.

[0027] Preferably, in the above-mentioned method of segmented rotation angle measurement to prevent blade sweeping the tower, the angle sensor and the connecting rod are provided in a one-to-one correspondence.

[0028] Preferably, in the above-mentioned method of segmented angle measurement to prevent blades from sweeping the tower, the connecting rod is a hard plastic tube.

[0029] Preferably, in the above-mentioned method of segmented angle measurement to prevent blade tower sweep, the connecting rod is bonded to the suction surface of the blade web, and further includes a covering layer for strengthening the connection between the connecting rod and the blade web.

[0030] Preferably, in the above-mentioned method of preventing blade sweep by segmented angle measurement, the spacing of the connecting rods on the blade web close to the blade tip is smaller than the spacing of the connecting rods on the blade web away from the blade tip.

[0031] Preferably, in the above-mentioned method of measuring the segmented rotation angle to prevent blades from sweeping the tower, the data collector is fixed on the manhole plate of the blade.

[0032] A fan comprises a device for measuring segmented rotation angles to prevent blades from sweeping the tower as described in any one of the above items.

[0033] The present invention provides a method for preventing blade tower sweep by segmented rotation angle measurement. A connecting rod is installed on the blade web, and the rotation angle of the connecting rod is measured. In combination with the Pythagorean theorem, the distance moved by the blade tip along the x-direction from the initial position to the measurement position is calculated. The obtained blade tip movement distance is compared with a preset maximum x-direction deformation. When the maximum horizontal deformation of the blade is greater than the preset maximum deformation, the blade pitch is changed to prevent blade tower sweep.

[0034] In addition, the present invention also provides a device for segmented angle measurement to prevent blades from sweeping the tower, which uses an angle sensor to measure the rotation angle of the connecting rod, and uses a data collector to calculate the distance the blade tip moves from the initial position to the measurement position along the x-direction, and uses a controller to compare the obtained blade tip movement distance with the preset maximum x-direction deformation. When the maximum horizontal deformation of the blade is greater than the preset maximum deformation, the blade pitch is changed to prevent the blade from sweeping the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a flow chart of a method for preventing blade sweeping by segmented angle measurement disclosed in an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the blade structure of the device for segmented angle measurement to prevent blade sweeping disclosed in an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the structure of the blade web of the device for segmented angle measurement to prevent blade sweeping disclosed in an embodiment of the present invention in the initial state and the measurement state;

[0039] Figure 4This is a schematic structural diagram of a blade web having an inclination angle in an initial state when installed in a device for measuring segmented rotation angles to prevent blade sweeping disclosed in an embodiment of the present invention;

[0040] Among them, 1 is the blade, 2 is the angle sensor, 3 is the data collector, and 4 is the connecting rod;

[0041] 11 is the blade root, 12 is the blade tip, and 13 is the blade web. DETAILED DESCRIPTION

[0042] The present invention discloses a method for preventing blades from sweeping the tower by measuring the segmented rotation angle, thereby preventing the problem of blades sweeping the tower and ensuring the safe use of the blades. In addition, the present invention also discloses a device for preventing blades from sweeping the tower by measuring the segmented rotation angle and a fan.

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0044] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0045] like Figure 1 As shown, the present application discloses a method for segmented angle measurement to prevent blade sweeping, comprising:

[0046] Step S1: Install the rotation angle sensor and connecting rod.

[0047] n connecting rods are arranged on the blade web from the blade root to the blade tip, and are parallel to the blade root plane. The connecting rods can be bonded to the suction surface of the blade web. Adhesive bonding facilitates easy operation and assembly and disassembly of the connecting rods. Of course, in some embodiments, welding or threaded connections can also be used to attach the connecting rods to the blade web.

[0048] Step S2: Measure and calculate the rotation angle of each connecting rod.

[0049] In some embodiments, the process of measuring and calculating the rotation angle of each connecting rod position includes: obtaining the instantaneous angle of the connecting rod position and the initial angle of the connecting rod position relative to the y direction;

[0050] Calculate the instantaneous rotation angle value of the connecting rod Δθi=θLi-θ0i; and calculate the rotation angle of the connecting rod relative to the y direction Where θLi is the instantaneous angle of the i-th connecting rod, and θ0i is the initial angle of the i-th connecting rod relative to the y direction.

[0051] Step S3: Calculate the horizontal deformation of each segment between the connecting rods on the blade, and calculate the x-direction deformation of the blade.

[0052] In some embodiments, the distance between adjacent connecting rods on the blade web is calculated as: ΔLi = S i+1 -S i , where S i is the distance from the i-th connecting rod to the blade root, S i+1 is the distance from the i+1th connecting rod to the blade root;

[0053] And calculate the distance between the connecting rod near the blade tip and the blade tip, ΔLn=L0-S n , where L0 is the distance from the blade root to the blade tip, S n is the distance from the nth connecting rod to the blade root;

[0054] Calculate the deformation of each segment of the connecting rods on the blade web along the x direction ΔXi = ΔLi*sin(θisum-β1-β2), and calculate the deformation of the blade tip along the x direction Where β1 is the cone angle at the hub when the blade is installed, β2 is the inclination angle of the nacelle main shaft when the blade is installed, and θisum is the distance from the blade root to the nearest connecting rod.

[0055] Step S4: Determine the magnitude of the blade deformation in the x-direction and the preset maximum deformation in the x-direction.

[0056] The size of the blade's x-direction deformation and the preset maximum horizontal deformation is determined. When it is determined that the blade's maximum horizontal deformation is greater than the preset maximum deformation, the blade pitch is changed to prevent the blade from sweeping the tower.

[0057] In this application, a connecting rod is installed on the blade web, and the rotation angle of the connecting rod is measured. In combination with the Pythagorean theorem, the distance moved by the blade tip position along the x-direction from the initial position to the measurement position is calculated. The obtained blade tip movement distance is compared with the preset maximum x-direction deformation. When the maximum horizontal deformation of the blade is greater than the preset maximum deformation, the blade pitch is changed to prevent the blade from sweeping the tower.

[0058] like Figure 2 and Figure 3As shown, the present invention discloses a device for segmented angle measurement to prevent blades from sweeping the tower, comprising a blade 1, a connecting rod 4, an angle sensor 2, a data collector 3 and a controller (not shown in the figure). The blade 1 comprises a blade tip 12 and a blade root 11 for connecting to the tower, and a blade web 13 arranged inside the blade 1. The specific structure of the blade 1 can refer to the structure of the existing blade 1 and will not be described here. The above-mentioned connecting rods 4 are arranged in n numbers along the extension direction of the blade web 13, specifically, arranged in the direction from the blade root 11 to the blade tip 12. After the connecting rods 4 are installed on the blade web 13, when the blade 1 is normally set, all the connecting rods 4 are parallel to the plane where the blade root 11 is located.

[0059] Combine Figure 3 and Figure 4 As shown, when the blade 1 is normally arranged, it has a certain curvature, on this basis, the connecting rod 4 is parallel to the plane where the blade root 11 is located.

[0060] On the basis of the above technical solution, the angle sensor 2 is set in one-to-one correspondence with the connecting rod 4 to obtain the instantaneous angle of the connecting rod 4 and the initial angle of the connecting rod 4 relative to the y direction.

[0061] The data collector 3 is connected to the angle sensor 2 and can calculate the instantaneous rotation angle value of the connecting rod 4 Δθi=θ1i-θ0i; and calculate the rotation angle of the connecting rod 4 relative to the y-direction section. Wherein, θLi is the instantaneous angle of the position of the i-th connecting rod 4, and θ0i is the initial angle of the position of the i-th connecting rod 4 relative to the y direction.

[0062] In addition, the data collector 3 can also calculate the distance between adjacent connecting rods 4 on the blade web 13: ΔLi = S i+1 -S i ; and calculate the distance between the connecting rod 4 near the blade tip 12 and the blade tip 12, ΔLn=L0-S n , where S i is the distance from the i-th connecting rod 4 to the blade root 11, S i+1 is the distance from the i+1th connecting rod 4 to the blade root 11; L0 is the distance from the blade root 11 to the blade tip 12, S n is the distance from the nth connecting rod 4 to the blade root 11 .

[0063] Combining the above two parameters and using the Pythagorean theorem, the x-direction deformation of each interval divided by the adjacent connecting rods 4 on the blade web 13 can be calculated as ΔXi = ΔLi*sin(θisum-β1-β2), and the x-direction deformation of the blade tip 12 can be calculated as Where β1 is the cone angle at the hub when the blade is installed, β2 is the inclination angle of the nacelle main shaft when the blade is installed, θisum is the rotation angle of the i-th connecting rod relative to the y direction, and S1 is the distance from the blade root to the nearest connecting rod.

[0064] After calculation, the data collector 3 obtains the y-direction deformation of the blade tip 12 and converts the information into a signal and transmits it to the controller. After receiving the signal, the controller converts it into a numerical signal and compares it with the preset maximum x-direction deformation pre-stored in the controller. If the controller determines that the x-direction deformation of the blade tip 12 is greater than the preset maximum x-direction deformation, the controller controls the blade pitch to prevent the blade from sweeping the tower.

[0065] It should be noted that when the blade 1 is installed on the fan and is perpendicular to the horizontal plane, Figure 3 The y direction is the direction of the horizontal plane, so the y-direction deformation of the blade tip 12 is the horizontal direction deformation of the blade tip 12 .

[0066] In this application, an angle sensor is used to measure the rotation angle of the connecting rod, and a data collector is used to calculate the distance the blade tip moves from the initial position to the measurement position along the x-direction. A controller is used to compare the obtained blade tip movement distance with the preset maximum x-direction deformation. When the maximum horizontal deformation of the blade is greater than the preset maximum deformation, the blade pitch is changed to prevent the blade from sweeping the tower.

[0067] In some embodiments, the connecting rod 4 can be configured as a rigid plastic tube. It should be noted that a rigid plastic tube is a tube that does not bend when in a free state. The plastic tube is lightweight and does not affect the weight of the blade 1. It should be noted that in practice, other lightweight structures with minimal deformation can also be used, such as acrylic rods.

[0068] The connecting rod 4 is bonded to the suction surface of the blade web 13. The bonding method is easy to operate and convenient for disassembling the connecting rod 4. Of course, in some embodiments, the connecting rod 4 can also be installed on the blade web 13 by welding or threading.

[0069] Since the blade 1 deforms under stress, the blade web 13 bends toward the suction surface of the blade 1. Therefore, the connecting rod 4 is connected to the suction surface of the blade web 13. When the blade web 13 bends, the connecting rod 4 is driven to rotate. The rotation angle of the connecting rod 4 is made the same as the rotation angle of the blade web 13, thereby improving the accuracy of the blade sweep risk assessment.

[0070] To improve the stability of the connection between the connecting rod 4 and the blade web 13, in some embodiments, the device for segmented angle measurement to prevent blade sweeping further includes a coating layer for strengthening the connection between the connecting rod 4 and the blade web 13. The coating layer can be a three-layer bidirectional fabric or a retaining member welded to the blade web 13. The connecting rod 4 is inserted between the retaining members and is retained on the blade web 13 by the retaining member.

[0071] The distribution of the connecting rods 4 on the blade web 13 in the present application can be set according to different needs. In some embodiments, the spacing of the connecting rods 4 on the blade web 13 near the blade tip 12 is set to be smaller than the spacing of the connecting rods on the blade web 13 away from the blade tip 12. Since the deformation of the blade tip 12 is large, arranging the connecting rods 4 more densely at the blade tip 12 can improve the accuracy of detection.

[0072] In some embodiments, 5 to 10 connecting rods 4 may be densely arranged near the blade tip 12, with the spanwise spacing of these connecting rods 4 being no greater than 2 m. The spanwise spacing of the connecting rods 4 at the remaining blades 1 is no greater than 5 m, and the distance between each connecting rod 4 and the blade root 11 is recorded. The distance between adjacent connecting rods 4 can be calculated using the data collector 3.

[0073] The data collector 3 in this application is fixed to the manhole plate on the blade 1. It should be noted that the manhole plate is a key component of the wind turbine blade. Installed inside the root of the wind turbine blade, it prevents debris from entering the shell. It has a circular hole for personnel to enter and perform maintenance and inspection on the blade. The blade tip is the end of the wind turbine blade away from the manhole plate.

[0074] In some embodiments, the length of the connecting rod 4 is set to 10 cm to 20 cm. The specific length and diameter of the connecting rod 4 can be set according to different needs and are all within the protection range.

[0075] In addition, the present application also discloses a wind turbine, including the segmented angle measurement device for preventing blade sweeping disclosed in the above embodiments. Therefore, the wind turbine having the segmented angle measurement device for preventing blade sweeping also has all the above technical effects, which will not be repeated here.

[0076] As used herein and in the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list; a method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0077] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0078] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preventing blade sweeping by segmented angle measurement, characterized in that: include: n connecting rods are arranged on the blade web of the blade along the direction from the blade root to the blade tip, and the connecting rods are all parallel to the plane where the blade root is located; the direction from the blade root to the blade tip is the y direction, and the x direction is perpendicular to the y direction; measuring and calculating the rotation angle of each connecting rod; Calculating the x-direction deformation of each segment between the connecting rods on the blade, and calculating the x-direction deformation of the blade; Determining the difference between the x-direction deformation of the blade and a preset maximum x-direction deformation, and when it is determined that the x-direction deformation of the blade is greater than the preset maximum x-direction deformation, pitching the blade to prevent the blade from sweeping the tower; The measuring and calculating the rotation angle of each connecting rod position includes: Obtaining the instantaneous angle of the position of the connecting rod and the initial angle of the position of the connecting rod relative to the y direction; Calculate the instantaneous rotation angle value of the connecting rod Δθi=θLi-θ0i; and calculate the rotation angle θisum= ; Where θLi is the instantaneous angle of the position of the i-th connecting rod, and θ0i is the initial angle of the position of the i-th connecting rod relative to the y direction; The calculating of the x-direction deformation of each segment between the connecting rods on the blade and obtaining the x-direction deformation of the blade includes: Calculate the distance between adjacent connecting rods on the blade web: ΔLi=S i+1 -S i ; Among them, S i is the distance from the i-th connecting rod to the blade root, S i+1 is the distance from the i+1th connecting rod to the blade root; And calculate the distance between the connecting rod near the blade tip and the blade tip, ΔLn=L0-S n ; Wherein, L0 is the distance from the blade root to the blade tip, S n is the distance from the nth connecting rod to the blade root; Calculate the deformation along the x direction of each interval divided by the adjacent connecting rods on the blade web , The deformation of the blade tip along the x direction is calculated - ; Wherein, β1 is the cone angle at the hub when the blade is installed, β2 is the inclination angle of the nacelle main shaft when the blade is installed, θisum is the rotation angle of the position of the i-th connecting rod relative to the y direction, and S1 is the distance from the blade root to the nearest connecting rod.

2. A device for measuring segmented rotation angles to prevent blades from sweeping the tower, characterized in that: include: Connecting rods: n connecting rods are arranged on the blade web along the direction from the blade root to the blade tip, and the connecting rods are all parallel to the plane where the blade root is located; An angle sensor, used to obtain the instantaneous angle of the position of the connecting rod and the initial angle of the position of the connecting rod relative to the y direction; A data collector is connected to the angle sensor for calculating the instantaneous rotation angle of the connecting rod Δθi=θLi-θ0i; and calculating the rotation angle θisum= of the connecting rod relative to the y direction. , Where θLi is the instantaneous angle of the position of the i-th connecting rod, and θ0i is the initial angle of the position of the i-th connecting rod relative to the y direction; Calculate the distance between adjacent connecting rods on the blade web: ΔLi=S i+1 -S i ; Among them, S i is the distance from the i-th connecting rod to the blade root, S i+1 is the distance from the i+1th connecting rod to the blade root; And calculate the distance between the connecting rod near the blade tip and the blade tip, ΔLn=L0-S n , Wherein, L0 is the distance from the blade root to the blade tip, S n is the distance from the nth connecting rod to the blade root; Calculate the deformation along the x direction of each interval divided by the adjacent connecting rods on the blade web , The deformation of the blade tip along the x direction is calculated - ; Wherein, β1 is the cone angle at the hub when the blade is installed, β2 is the inclination angle of the nacelle main shaft when the blade is installed, θisum is the rotation angle of the position of the i-th connecting rod relative to the y direction, and S1 is the distance from the blade root to the nearest connecting rod; The controller is used to determine the difference between the x-direction deformation of the blade tip calculated by the data collector and the preset maximum x-direction deformation, and when it is determined that the x-direction deformation of the blade tip is greater than the preset maximum x-direction deformation, the blade pitch is changed.

3. The device for segmented angle measurement to prevent blade sweeping according to claim 2 is characterized in that: The angle sensors are arranged in a one-to-one correspondence with the connecting rods.

4. The device for segmented angle measurement to prevent blades from sweeping the tower according to claim 2 is characterized in that: The connecting rod is a hard plastic tube.

5. The device for segmented angle measurement to prevent blades from sweeping the tower according to claim 2, characterized in that: The connecting rod is bonded to the suction surface of the blade web and further comprises a covering layer for strengthening the connection between the connecting rod and the blade web.

6. The device for segmented angle measurement to prevent blades from sweeping the tower according to claim 2, characterized in that: The spacing between the connecting rods on the blade web close to the blade tip is smaller than the spacing between the connecting rods on the blade web far from the blade tip.

7. The device for segmented angle measurement to prevent blades from sweeping the tower according to claim 2, characterized in that: The data collector is fixed on the manhole plate of the blade.

8. A fan, characterized in that: The device comprises a segmented angle measurement device for preventing blades from sweeping the tower as described in any one of claims 2 to 7.

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