Blisk verticality detection method

Abstract

This invention provides a method for detecting the perpendicularity of blade root threaded sleeves. The method includes control and detection steps: First, it addresses six core influencing factors—blade root end face grinding benchmark, mold axial misalignment, steel flange installation and deformation, threaded sleeve machining accuracy, and human operation—by employing differentiated control strategies and quantitative calculations to achieve precise constraints on perpendicularity deviation. Then, using dedicated inspection bolts compatible with actual batch-produced bolts, the method accurately obtains the threaded sleeve perpendicularity deviation and its actual impact on hub installation through three steps: bolt installation, gap measurement, and formula conversion. This invention offers accurate detection, high efficiency, and low cost, adapting to real-time production line testing needs. It can flexibly adapt to different wind turbine blade models, and combined with control methods, it achieves full-process deviation control and traceability, effectively avoiding assembly interference risks, improving wind turbine blade assembly quality and overall turbine reliability, and possesses significant potential for widespread application.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade manufacturing technology, and in particular to a method for detecting the verticality of the blade root bolt sleeve. Background Technology

[0002] As the core load-bearing component of wind turbine generators, the embedded threaded sleeve at the blade root is a crucial structure for connecting and fixing the blade to the hub. The perpendicularity of the threaded sleeve directly determines the assembly accuracy, thus affecting the stability, safety, and service life of the generator set. In existing wind turbine blade manufacturing processes, excessive perpendicularity deviation is a common problem after the installation of the blade root threaded sleeve. This deviation is caused by multiple factors, including grinding processes, mold closing accuracy, component processing, and human operation, and the causes are scattered yet interconnected.

[0003] Currently, the industry lacks a systematic blade root verticality control system, precise control over key influencing factors, and efficient and accurate inspection methods adapted to actual operating conditions. This leads to irregular fluctuations in deviations, making it impossible to quickly and accurately obtain true deviation data and hindering real-time quality control and deviation traceability during the production process. This makes bolt and hub interference risks more likely during blade assembly, severely restricting the assembly quality of wind turbine blades and the reliability of the entire turbine. Therefore, there is an urgent need to develop a blade root verticality control and inspection method covering the entire process to address the technical pain points of insufficient deviation control and inadequate inspection methods in existing technologies. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for detecting the perpendicularity of the blade root screw sleeve in response to the above-mentioned technical problems.

[0005] A method for detecting the perpendicularity of a blade root screw sleeve includes the following steps:

[0006] S1, Obtain the inspection screws;

[0007] S2, screw the inspection bolt into the pre-embedded threaded sleeve of the blade root to be tested until the reference end face is in contact with the end face of the pre-embedded threaded sleeve of the blade root to be tested, and tighten it according to the preset torque;

[0008] S3, Measure the gap between the stepped structure and the end face of the pre-embedded threaded sleeve at the root of the blade to be tested;

[0009] S4. Based on the gap value and the known structural parameters of the inspection bolt, the verticality deviation of the embedded threaded sleeve at the blade root to be tested is calculated.

[0010] In one embodiment, the test bolt has a threaded section adapted to the pre-embedded threaded sleeve of the blade root to be tested, and one end of the test bolt has a reference end face for fitting with the end face of the pre-embedded threaded sleeve of the blade root to be tested. The test bolt has a stepped structure on its shank, and the stepped structure has a radial dimension abrupt change.

[0011] In one embodiment, the method further includes the following steps prior to step S1:

[0012] Corresponding control methods are adopted to constrain and control the factors affecting leaf root verticality.

[0013] In one embodiment, the constraint control method for the influencing factors of leaf root verticality includes:

[0014] The total deviation of leaf root verticality is calculated using the following formula:

[0015]

[0016] in, This indicates the total deviation of leaf root verticality. This indicates the grinding reference deviation of the blade root end face and the axial misalignment deviation of the mold closing mechanism. This indicates the deviation in the installation angle of the steel flange. Indicates the deformation deviation of the steel flange. This indicates the machining accuracy deviation of the pre-embedded threaded sleeve at the blade root.

[0017] In one embodiment, the method for limiting and controlling the blade root end face grinding reference deviation and the mold closing axial misalignment deviation includes:

[0018] Scan all the end faces of the pre-embedded threaded sleeves and form a unified reference plane by fitting the data using the least squares method;

[0019] Using the reference plane as a reference, perform equidistant grinding to make the leaf root end face parallel to the reference plane;

[0020] The axial misalignment during mold closing is controlled, and the blade root end face grinding reference deviation and mold closing axial misalignment deviation are calculated using the following formulas:

[0021]

[0022]

[0023] in, This indicates the grinding reference deviation of the blade root end face and the axial misalignment deviation of the mold closing mechanism. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the maximum and minimum distance between the positions of the threaded sleeve end face obtained by scanning. This indicates the inclination angle of the reference plane caused by axial misalignment. This indicates the axial misalignment distance of the threaded sleeve during mold closing.

[0024] In one embodiment, the method for limiting and controlling the installation angle deviation of the steel flange includes:

[0025] The included angle formed by the mounting reference surfaces of the pre-embedded bolt sleeves on the two sets of steel flanges during mold closing is measured, and the installation angle deviation of the steel flanges is calculated using the following formula:

[0026]

[0027] in, This indicates the deviation in the installation angle of the steel flange. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the maximum flatness deviation.

[0028] In one embodiment, the corresponding method for limiting and controlling the deformation deviation of the steel flange includes:

[0029] Obtain the maximum permissible flatness deviation of the steel flange;

[0030] The flatness deviation of the steel flange installation reference surface shall not exceed the maximum flatness deviation, and the deformation deviation of the steel flange shall be calculated using the following formula:

[0031]

[0032]

[0033] in, Indicates the deformation deviation of the steel flange. Indicates the maximum flatness deviation. Indicates the diameter of the steel flange. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the angular deviation caused by flatness deviation.

[0034] In one embodiment, the method for limiting and controlling the machining accuracy deviation of the pre-embedded threaded sleeve includes:

[0035] Obtain the standard for form and position tolerances of the threaded sleeve; wherein, the standard for form and position tolerances of the threaded sleeve includes: flatness of the end face of the threaded sleeve, perpendicularity of the inner hole, and coaxiality of the inner hole and the threaded section;

[0036] Real-time online monitoring is implemented, and no fewer than three products are randomly selected from each batch for full-size inspection to control the machining accuracy deviation of the blade root pre-embedded screw sleeve within the preset range.

[0037] In one embodiment, the influencing factors also include: human operational factors;

[0038] The corresponding methods for limiting and controlling the influencing factors of human operation include:

[0039] Establish standardized operating procedures and clarify the torque deviation of the air hammer mounting bolts;

[0040] Quality control points are set up to monitor and record data on key operations in real time; the key operations include bolt tightening and sealing ring installation.

[0041] In one embodiment, step S4 includes:

[0042] Calculate the verticality deviation using the following formula:

[0043]

[0044]

[0045]

[0046] in, Indicates verticality deviation. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the actual tilt angle corresponding to the verticality deviation of the embedded threaded sleeve at the blade root. Indicates the measured gap value. Indicates the minor diameter of the bolt step. This indicates the actual impact of perpendicularity deviation on wheel hub installation. This indicates the exposed length of the bolt.

[0047] Compared with existing technologies, the advantages and beneficial effects of this invention are as follows: This invention provides accurate detection, efficient operation, and low cost. It is suitable for real-time detection needs of production lines, can be flexibly adapted to different types of wind turbine blades, and, combined with control methods, enables full-process deviation management and traceability. It effectively avoids assembly interference risks, improves the assembly quality of wind turbine blades and the reliability of the entire machine, and has good promotional value. Attached Figure Description

[0048] Figure 1 This is a flowchart illustrating a method for detecting the perpendicularity of a blade root screw sleeve in one embodiment;

[0049] Figure 2 This is a schematic diagram of the structure of inspection bolt 1 in one embodiment;

[0050] Figure 3 This is a schematic diagram of the structure of the inspection bolt 2 in one embodiment;

[0051] Figure 4 This is a schematic diagram of the misalignment of the threaded sleeve cross section in one embodiment;

[0052] Figure 5 This is a schematic diagram of the extreme value distribution of the screw sleeve in one embodiment;

[0053] Figure 6 This is a schematic diagram illustrating the calculation of the blade root end face grinding reference deviation and mold closing axial misalignment deviation in one embodiment. Detailed Implementation

[0054] Before describing the specific embodiments of the present invention, the overall concept of the present invention will be explained as follows:

[0055] This invention is mainly based on the research and development of the production quality control process of pre-embedded screw sleeves for wind turbine blade roots. Currently, the industry generally suffers from excessive verticality deviation of the screw sleeves, high risk of assembly interference, and a lack of efficient and accurate control and testing methods, which seriously affects the production efficiency of wind turbine blades and the reliability of the entire machine operation.

[0056] Through analysis, the inventors discovered that the main reason for the aforementioned problems was the lack of a systematic analysis of the core influencing factors of blade root threaded sleeve perpendicularity, the absence of targeted factor-based control strategies, and the inability of the testing methods to accurately detect and constrain deviations at their source due to unsuitable actual assembly conditions. These problems can be avoided by precisely controlling core influencing factors such as blade root end face grinding, mold misalignment, and steel flange installation and deformation, and by adopting efficient testing methods adapted to the production site. Therefore, this invention proposes a method for detecting the perpendicularity of blade root threaded sleeves. By combining targeted perpendicularity control methods with factor-based quantitative control and specialized inspection bolt testing, it achieves precise control and efficient detection of blade root threaded sleeve perpendicularity throughout the entire process, addressing the pain points of existing technologies.

[0057] After introducing the overall concept of the present invention, in order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0058] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0059] In one embodiment, such as Figure 1 As shown, a method for detecting the perpendicularity of a blade root screw sleeve is provided, including the following steps:

[0060] Step S1: Obtain the inspection screw.

[0061] Specifically, we design special inspection bolts that are fully compatible with the actual batch-produced bolts to ensure that the test results match the actual working conditions.

[0062] Based on this, the inspection bolt has a threaded section that is compatible with the pre-embedded threaded sleeve of the blade root to be tested, and one end of the bolt has a reference end face for fitting with the end face of the pre-embedded threaded sleeve of the blade root to be tested. The bolt has a stepped structure on its shaft, and the stepped structure has a radial dimension abrupt change.

[0063] Specifically, the inspection bolt has a threaded section that matches the pre-embedded threaded sleeve at the root of the blade to be tested, and one end of it has a reference end face for engaging with the end face of the pre-embedded threaded sleeve at the root of the blade to be tested. The rod body has a stepped structure with a radial dimension abrupt change and a minor diameter of the step. than the diameter 2-5mm smaller; inspect the flatness of the end face of the bolt and the sleeve contact end to be ≤0.01mm, and its thread size and length are completely consistent with the actual batch-produced bolts.

[0064] Step S2: Screw the test bolt into the pre-embedded threaded sleeve of the blade root to be tested until the reference end face is in contact with the end face of the pre-embedded threaded sleeve of the blade root to be tested, and tighten it according to the preset torque.

[0065] Specifically, screw the test bolt into the pre-embedded threaded sleeve at the root of the blade to be tested until the reference end face is in contact with the end face of the pre-embedded threaded sleeve at the root of the blade to be tested, and tighten it to the preset torque. The torque deviation should be ≤±5% to avoid testing errors caused by loosening.

[0066] Step S3: Measure the gap between the stepped structure and the end face of the pre-embedded threaded sleeve at the root of the leaf to be tested.

[0067] Specifically, a plug gauge with an accuracy of ≥0.01mm is used to measure the gap between the stepped structure and the end face of the pre-embedded threaded sleeve at the blade root. The test data for each threaded sleeve was recorded one by one.

[0068] Step S4: Based on the gap value and the known structural parameters of the inspection bolt, calculate the perpendicularity deviation of the embedded threaded sleeve at the blade root to be tested.

[0069] Specifically, based on gap value Based on the known structural parameters of the inspection bolts, the perpendicularity deviation of the embedded bolt sleeve at the blade root to be tested is calculated.

[0070] Based on this, step S4 includes:

[0071] Calculate the verticality deviation using the following formula:

[0072]

[0073]

[0074]

[0075] in, Indicates verticality deviation. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the actual tilt angle corresponding to the verticality deviation of the embedded threaded sleeve at the blade root. Indicates the measured gap value. Indicates the minor diameter of the bolt step. This indicates the actual impact of perpendicularity deviation on wheel hub installation. This indicates the exposed length of the bolt.

[0076] Specifically, such as Figure 2 and Figure 3 As shown, the perpendicularity deviation of the pre-embedded threaded sleeve at the leaf root is calculated using the following formula:

[0077]

[0078]

[0079]

[0080] in, Indicates verticality deviation. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the actual tilt angle corresponding to the verticality deviation of the embedded threaded sleeve at the blade root. Indicates the measured gap value. Indicates the minor diameter of the bolt step. This indicates the actual impact of perpendicularity deviation on wheel hub installation. This indicates the exposed length of the bolt.

[0081] Based on this, the steps preceding step S1 also include:

[0082] Corresponding control methods are adopted to constrain and control the factors affecting leaf root verticality.

[0083] To constrain and control the factors influencing leaf root verticality, corresponding control methods are adopted, including:

[0084] The total deviation of leaf root verticality is calculated using the following formula:

[0085]

[0086] in, This indicates the total deviation of leaf root verticality. This indicates the grinding reference deviation of the blade root end face and the axial misalignment deviation of the mold closing mechanism. This indicates the deviation in the installation angle of the steel flange. Indicates the deformation deviation of the steel flange. This indicates the machining accuracy deviation of the pre-embedded threaded sleeve.

[0087] Specifically, after comprehensive analysis, the key factors affecting the verticality of the leaf roots in the existing process include the following six items, each of which, independently or synergistically, leads to deviations:

[0088] Blade root end face grinding reference deviation: The existing grinding machine uses the outer circle of the blade root as the positioning reference, but there is a deviation angle between the outer circle of the blade root and the axis of the blade root pre-embedded threaded sleeve, which directly leads to the perpendicularity between the grinding end face and the blade root pre-embedded threaded sleeve not matching.

[0089] Axial misalignment deviation during mold closing: During the mold closing process of the blade PS surface (pressure surface) and SS surface (suction surface), there is an axial misalignment S, which makes the mounting reference surfaces of the pre-embedded screw sleeves on both sides of the blade root not coplanar, causing perpendicularity deviation.

[0090] Steel flange installation angle deviation: The blade root steel flanges are divided into two groups, PS face and SS face. When the mold is closed, the installation reference surfaces of the blade root embedded bolts on the two groups of steel flanges are not parallel, forming an included angle. This damages the verticality benchmark of the pre-embedded screw sleeve at the leaf root;

[0091] Steel flange deformation deviation: The steel flange used for the installation of the embedded bolt sleeve at the blade root is a large-sized annular thin-walled structure, which is prone to deformation during long-term use, resulting in deviation of the flatness of the bolt sleeve installation reference surface, which indirectly affects the verticality;

[0092] The machining accuracy deviation of the blade root pre-embedded threaded sleeve: The machining accuracy of the blade root pre-embedded threaded sleeve itself (such as end face flatness, inner hole perpendicularity, coaxiality, etc.) directly determines the installation reference accuracy, and its machining error is the original influencing factor of perpendicularity deviation.

[0093] Human factors affecting verticality: The bolts of the air hammer were not tightened to the specified torque, resulting in the improper installation of the embedded bolt sleeve at the blade root; the end face sealing ring was not fully embedded in the groove during installation, causing uneven compression and making the end face of the embedded bolt sleeve at the blade root uneven. These factors combined caused verticality deviation.

[0094] Total deviation of leaf root verticality Based on actual analysis and calculations, and These two factors are the core factors that have the greatest impact on verticality. By focusing on controlling these two factors, the total deviation can be effectively reduced to within the required range.

[0095] Based on this, the corresponding limiting and control methods for the blade root end face grinding reference deviation and mold closing axial misalignment deviation include:

[0096] Scan all the end faces of the pre-embedded threaded sleeves and form a unified reference plane by fitting the data using the least squares method;

[0097] Using the reference plane as a reference, perform equidistant grinding to make the leaf root end face parallel to the reference plane;

[0098] The axial misalignment during mold closing is controlled, and the blade root end face grinding reference deviation and mold closing axial misalignment deviation are calculated using the following formulas:

[0099]

[0100]

[0101] in, This indicates the grinding reference deviation of the blade root end face and the axial misalignment deviation of the mold closing mechanism. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the maximum and minimum distance between the positions of the threaded sleeve end face obtained by scanning. This indicates the inclination angle of the reference plane caused by axial misalignment. This indicates the axial misalignment distance of the threaded sleeve during mold closing.

[0102] Specifically, considering the synergistic effect of the grinding reference deviation at the blade root end face and the axial misalignment deviation during mold closing, the grinding process was optimized and control parameters were quantified:

[0103] Abandoning the traditional grinding method that uses the outer diameter of the blade root as a reference, a novel approach is adopted: fitting a reference plane to the end face of the pre-embedded threaded sleeve at the blade root. All end faces of the pre-embedded threaded sleeves at the blade root are scanned using high-precision scanning equipment (scanning accuracy ≥ 0.01 mm), and a unified reference plane is formed using the least squares method. This reference plane accurately reflects the overall installation reference of all threaded sleeves, effectively eliminating local errors in individual threaded sleeves; for example... Figure 4 As shown, the blade root end face is parallel to the fitting reference plane by equidistant grinding with the reference plane as a reference. At this time, it is only necessary to control the axial misalignment S of the mold closing to constrain the perpendicularity deviation of this link.

[0104] like Figure 5 and Figure 6 As shown, the length of the pre-embedded threaded sleeve at the blade root is L, the maximum and minimum distance between the end faces of the threaded sleeve obtained by scanning is L1, and the axial misalignment distance of the threaded sleeve during mold closing is S. The axial misalignment during mold closing is controlled, and the grinding reference deviation of the blade root end face and the axial misalignment deviation during mold closing are calculated using the following formulas:

[0105]

[0106]

[0107] in, This indicates the grinding reference deviation of the blade root end face and the axial misalignment deviation of the mold closing mechanism. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the maximum and minimum distance between the positions of the threaded sleeve end face obtained by scanning. This indicates the inclination angle of the reference plane caused by axial misalignment. This indicates the axial misalignment distance of the threaded sleeve during mold closing.

[0108] Based on this, the corresponding methods for limiting and controlling the installation angle deviation of steel flanges include:

[0109] The included angle formed by the mounting reference surfaces of the pre-embedded bolt sleeves on the two sets of steel flanges during mold closing is measured, and the installation angle deviation of the steel flanges is calculated using the following formula:

[0110]

[0111] in, This indicates the deviation in the installation angle of the steel flange. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the included angle formed when the mounting reference surfaces of the pre-embedded threaded sleeves on the two sets of steel flanges are not parallel during mold closing.

[0112] Specifically, the deviation in the installation angle of steel flanges is controlled through precise measurement and threshold constraints.

[0113] The length of the embedded bolt sleeve at the blade root is L. When the mold is closed, the included angle formed by the non-parallel installation reference surfaces of the embedded bolt sleeves at the blade root on the two sets of steel flanges is... The installation angle deviation of the steel flange is: .

[0114] Based on this, the corresponding methods for limiting and controlling the deformation deviation of steel flanges include:

[0115] Obtain the maximum permissible flatness deviation of the steel flange;

[0116] The flatness deviation of the steel flange installation reference surface shall not exceed the maximum flatness deviation, and the maximum flatness deviation shall be calculated using the following formula:

[0117]

[0118]

[0119] in, Indicates the deformation deviation of the steel flange. Indicates the flatness of the design. Indicates the diameter of the steel flange. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the angular deviation caused by flatness deviation.

[0120] Specifically, finite element simulation analysis is performed on the steel flange to simulate its stress state and deformation trend during long-term use, and to determine the maximum allowable flatness deviation of the steel flange. (Recommended ≤0.1mm) Control the flatness deviation of the steel flange installation reference surface to be no greater than the maximum flatness deviation, and calculate the maximum flatness deviation using the following formula:

[0121]

[0122]

[0123] in, Indicates the deformation deviation of the steel flange. Indicates the flatness of the design. Indicates the diameter of the steel flange. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the angular deviation caused by flatness deviation.

[0124] Based on this, the corresponding methods for limiting and controlling the machining accuracy deviation of the blade root pre-embedded threaded sleeve include:

[0125] Obtain the standard for form and position tolerances of the threaded sleeve; wherein, the standard for form and position tolerances of the threaded sleeve includes: flatness of the end face of the threaded sleeve, perpendicularity of the inner hole, and coaxiality of the inner hole and the threaded section;

[0126] Real-time online monitoring is implemented, and no fewer than three products are randomly selected from each batch for full-size inspection to control the machining accuracy deviation of the blade root pre-embedded screw sleeve within the preset range.

[0127] Specifically, addressing the inherent factor of machining accuracy deviation in the threaded sleeve, strict processing techniques and quality control requirements are established, clearly defining geometric tolerance standards: threaded sleeve end face flatness ≤ 0.05mm, inner hole perpendicularity ≤ 0.1mm, and inner hole and thread section coaxiality ≤ 0.1mm. During processing, blue light inspection equipment is used for real-time online monitoring, and at least three products from each batch are randomly selected for full-size inspection to ensure that the machining accuracy of the blade root embedded threaded sleeve meets design requirements, thus mitigating the perpendicularity deviation caused by the embedded threaded sleeve itself. The size should be controlled within ≤0.1mm.

[0128] In addition to this, influencing factors also include: human operational factors;

[0129] The corresponding methods for limiting and controlling the influencing factors of human operation include:

[0130] Establish standardized operating procedures and clarify the torque deviation of the air hammer mounting bolts;

[0131] Quality control points are set up to monitor and record data on key operations in real time; the key operations include bolt tightening and sealing ring installation.

[0132] Specifically, to address the influencing factors of human error, a standardized operation and supervision system should be established to eliminate operational deviations.

[0133] Establish operating procedures: Define the standard tightening torque for the air wrench mounting bolts (set according to the bolt sleeve specifications, torque deviation ≤ ±5%), and stipulate that the sealing ring must be fully embedded in the groove without twisting or offset.

[0134] Personnel training and assessment: Operators are regularly trained on process principles and standardized operating procedures. After the training, they are assessed on both theory and practical skills. Only those who pass the assessment are allowed to work.

[0135] Process monitoring and recording: Quality control points are set up on the production site, and key operations such as bolt tightening and sealing ring installation are monitored and recorded in real time using methods such as torque wrenches and visual inspection, so as to correct non-standard operations in a timely manner.

[0136] This invention achieves effective control of leaf root verticality deviation throughout the entire process through a synergistic design of systematic control and precise detection, and has the following significant technical effects:

[0137] 1. Significantly improved deviation control accuracy: Through differentiated and precise control of six core influencing factors, especially focusing on the optimization of key influencing factors such as blade root end face grinding benchmark deviation, mold closing axial misalignment deviation, and steel flange installation angle deviation, the maximum cumulative deviation of blade root verticality has been effectively reduced, completely avoiding the risk of bolt and hub assembly interference, and significantly improving the assembly qualification rate.

[0138] 2. Excellent cost-effectiveness of the control solution: By quantitatively calculating and clarifying the impact weight of each factor on verticality, there is no need to make major modifications to existing production equipment. Only the core influencing factors are optimized for process and control procedures, which reduces unnecessary process cost investment while ensuring control effect.

[0139] 3. Precise and efficient testing method: The special inspection bolts completely simulate the actual assembly conditions, and the test results can directly reflect the actual impact of perpendicularity deviation on wheel hub installation, with high data reliability; the testing process does not require large precision equipment and is simple and quick to operate;

[0140] 4. Strong versatility and adaptability: This control and detection method can be flexibly adapted to wind turbine blades of different models and structures. Only the relevant calculation parameters need to be adjusted according to the specific parameters of the blade (such as the sleeve length L, the steel flange diameter D, etc.). There is no need to redesign the control or detection scheme. It has a wide range of applications and has good promotion value.

[0141] It should be noted that the above description describes some embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0142] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of the invention as described above, which are not provided in the details for the sake of brevity.

[0143] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0144] While specific details have been set forth to describe exemplary embodiments of the invention, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive. Although the invention has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description.

[0145] The embodiments of this invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this invention should be included within the protection scope of this invention.

Claims

1. A method for detecting the perpendicularity of a blade root screw sleeve, characterized in that, include: S1, Obtain the inspection screws; S2, screw the inspection bolt into the pre-embedded threaded sleeve of the blade root to be tested until the reference end face is in contact with the end face of the pre-embedded threaded sleeve of the blade root to be tested, and tighten it according to the preset torque; S3, Measure the gap between the stepped structure and the end face of the pre-embedded threaded sleeve at the root of the blade to be tested; S4. Based on the gap value and the known structural parameters of the inspection bolt, the verticality deviation of the embedded threaded sleeve at the blade root to be tested is calculated.

2. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 1, characterized in that, The inspection bolt has a threaded section that is compatible with the pre-embedded threaded sleeve of the blade root to be tested, and one end of it is provided with a reference end face for fitting with the end face of the pre-embedded threaded sleeve of the blade root to be tested. The shank of the inspection bolt is provided with a stepped structure, and the stepped structure has a sudden change in radial dimension.

3. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 1, characterized in that, The procedure preceding step S1 also includes: Corresponding control methods are adopted to constrain and control the factors affecting leaf root verticality.

4. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 3, characterized in that, The control measures for the influencing factors of leaf root verticality include: The total deviation of leaf root verticality is calculated using the following formula: in, This indicates the total deviation of leaf root verticality. This indicates the grinding reference deviation of the blade root end face and the axial misalignment deviation of the mold closing mechanism. This indicates the deviation in the installation angle of the steel flange. Indicates the deformation deviation of the steel flange. This indicates the machining accuracy deviation of the pre-embedded threaded sleeve at the blade root.

5. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 4, characterized in that, The corresponding limiting and control methods for the blade root end face grinding reference deviation and mold closing axial misalignment deviation include: Scan all the end faces of the pre-embedded threaded sleeves and form a unified reference plane by fitting the data using the least squares method; Using the reference plane as a reference, perform equidistant grinding to make the leaf root end face parallel to the reference plane; The axial misalignment during mold closing is controlled, and the blade root end face grinding reference deviation and mold closing axial misalignment deviation are calculated using the following formulas: in, This indicates the grinding reference deviation of the blade root end face and the axial misalignment deviation of the mold closing mechanism. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the maximum and minimum distance between the positions of the threaded sleeve end face obtained by scanning. This indicates the inclination angle of the reference plane caused by axial misalignment. This indicates the axial misalignment distance of the threaded sleeve during mold closing.

6. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 4, characterized in that, The corresponding methods for limiting and controlling the installation angle deviation of the steel flange include: The included angle formed by the mounting reference surfaces of the pre-embedded bolt sleeves on the two sets of steel flanges during mold closing is measured, and the installation angle deviation of the steel flanges is calculated using the following formula: in, This indicates the deviation in the installation angle of the steel flange. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the included angle formed by the mounting reference surfaces of the pre-embedded bolt sleeves on the two sets of steel flanges during mold closing.

7. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 4, characterized in that, The corresponding methods for limiting and controlling the deformation deviation of the steel flange include: Obtain the maximum permissible flatness deviation of the steel flange; The flatness deviation of the steel flange installation reference surface shall not exceed the maximum flatness deviation, and the deformation deviation of the steel flange shall be calculated using the following formula: in, Indicates the deformation deviation of the steel flange. Indicates the maximum flatness deviation. Indicates the diameter of the steel flange. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the angular deviation caused by flatness deviation.

8. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 4, characterized in that, The methods for limiting and controlling the machining accuracy deviation of the blade root pre-embedded threaded sleeve include: Obtain the standard for form and position tolerances of the threaded sleeve; wherein, the standard for form and position tolerances of the threaded sleeve includes: flatness of the end face of the threaded sleeve, perpendicularity of the inner hole, and coaxiality of the inner hole and the threaded section; Real-time online monitoring is implemented, and no fewer than three products are randomly selected from each batch for full-size inspection to control the machining accuracy deviation of the blade root pre-embedded screw sleeve within the preset range.

9. The method for detecting the perpendicularity of the blade root screw sleeve according to claim 4, characterized in that, The influencing factors also include: human operational factors; The corresponding methods for limiting and controlling the influencing factors of human operation include: Establish standardized operating procedures and clarify the torque deviation of the air hammer mounting bolts; Quality control points are set up to monitor and record data on key operations in real time; the key operations include bolt tightening and sealing ring installation.

10. The method for detecting the perpendicularity of a blade root screw sleeve according to claim 1, characterized in that, Step S4 includes: Calculate the verticality deviation using the following formula: in, Indicates verticality deviation. Indicates the length of the pre-embedded threaded sleeve at the leaf root. This indicates the actual tilt angle corresponding to the verticality deviation of the embedded threaded sleeve at the blade root. Indicates the measured gap value. Indicates the minor diameter of the bolt step. This indicates the actual impact of perpendicularity deviation on wheel hub installation. This indicates the exposed length of the bolt.

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