Wind turbine blade root bolt sleeve position detection method

Abstract

A method for detecting the position of a bolt sleeve at a blade root of a wind turbine blade comprises the following steps: measuring the coordinates of the end face of the bolt sleeve by using a laser tracker, fitting the coordinates of the end faces of each bolt sleeve in mathematical software to obtain a common plane P of the end faces of each bolt sleeve; measuring the coordinates of the outer wall of a blade root cylindrical section by using a laser tracker, fitting the coordinates of the outer wall of the blade root cylindrical section in mathematical software to obtain the outer wall curved surface of the blade root cylindrical section, and calculating the blade root axis L through the outer wall curved surface of the blade root cylindrical section; measuring the coordinates of a screw rod polished rod part of an auxiliary detection screw by using a laser tracker, fitting the coordinates of the screw rod polished rod part in mathematical software to obtain the axis Li of each screw; and calculating the angle between the axis Li of each screw and the common plane P by using mathematical software to detect whether the axis of the bolt sleeve is perpendicular to the end face of the blade root, calculating the angle between the axis Li of each screw and the axis L of the blade root and the relative position relationship, and detecting whether the position and parallelism of the axis of the bolt sleeve relative to the axis of the blade root meet the requirements.

Description

Technical Field

[0001] The invention relates to a method for detecting the position of a bolt sleeve at a blade root of a wind turbine blade, which is used for detecting the position of a bolt sleeve pre-embedded at the blade root of a wind turbine blade. Background Art

[0002] With the development of large-scale wind turbine blades, the diameter of the pitch circle at the root of the blade is getting larger and larger, which puts higher requirements on the processing accuracy and quality control of the bolted joints at the root of the blade. The main component of the epoxy series wind turbine blade is epoxy fiberglass, which is formed by mixing glass fiber cloth and epoxy resin. Bolt holes are set at the root of the blade to fix the blade to the wind turbine main engine. Some methods of forming bolt holes at the root of the blade adopt the bolt sleeve pre-embedded forming process, that is, when the blade is formed, the bolt sleeve is pre-embedded in the root of the blade. After the forming and curing, the bolts can be directly connected to fix the blade to the wind turbine main engine. In the bolt sleeve pre-embedded forming process, in order to ensure that the bolt sleeve is evenly distributed at the root of the blade according to the size of the drawing, a set of positioning flanges is used. Before the blade is formed, the bolt sleeve is fixed to the positioning flange through the positioning screw to ensure the position requirement of the bolt sleeve at the root of the blade. When epoxy blades are formed, sometimes the vacuum seal between the bolt sleeve and the positioning flange is not in place, causing the epoxy resin to enter the bolt sleeve before curing. After the epoxy resin is cured, the bolt sleeve and the positioning screw are very firmly bonded together. The positioning screw is fixed in the bolt sleeve and cannot be removed. The blade is connected to the whole machine bearing through the bolt and the bolt sleeve, thereby realizing the transfer of load. Since the blade root has the largest load and a complex stress state, it is subjected to complex shear, extrusion, and torsion loads, so the blade root connector must have sufficient strength and rigidity while also having sufficient processing accuracy.

[0003] The position of the bolt sleeve and its perpendicularity to the blade root end face are important indicators for measuring the accuracy of the blade root connector. If the requirements are not met, the following problems may occur: 1. The blade cannot be installed normally with the whole machine interface; 2. Interference and extrusion occur between the connecting bolt and the bolt hole of the bearing, affecting the service life of the bolt. Summary of the invention

[0004] The method for detecting the position of the bolt sleeve at the root of a wind turbine blade provided by the present invention can realize the rapid detection of the position of the bolt sleeve at the root of a wind turbine blade, effectively improve the detection accuracy of the bolt sleeve position of the blade, and provide a data basis for measuring the accuracy of the blade root connecting piece, so as to evaluate whether the position of the bolt sleeve and the verticality of the bolt sleeve and the blade root end face meet the accuracy requirements of the blade root connecting piece, thereby forming a reliable detection process before the installation of the wind turbine blade, and preventing blades that do not meet the accuracy requirements of the blade root connecting piece from being installed on the wind turbine main engine.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for detecting the position of a bolt sleeve at the root of a wind turbine blade is characterized by comprising the following steps:

[0007] Step 1: Place the blade root with embedded bolt sleeves but no screws installed in a blade posture, measure the coordinates of each bolt sleeve end face with a laser tracker, and fit the coordinates of each bolt sleeve end face in mathematical software to obtain the common plane P of each bolt sleeve end face;

[0008] Step 2: Use a laser tracker to measure the coordinates of the outer wall of the blade root cylindrical section, fit the coordinates of the outer wall of the blade root cylindrical section in mathematical software to obtain the outer wall surface of the blade root cylindrical section, and calculate the blade root axis L through the outer wall surface of the blade root cylindrical section;

[0009] The third point: Place the blade root with the auxiliary detection screw installed in a blade posture, use a laser tracker to measure the coordinates of the screw polished rod part of the auxiliary detection screw, and fit the coordinates of the screw polished rod part in the mathematical software to obtain the axis L of each screw i ;

[0010] Step 4: Use mathematical software to calculate the axis L of each screw i The angle between the bolt sleeve and the common plane P is used to check whether the axis of the bolt sleeve is perpendicular to the blade root end face and calculate the axis L of each screw. i The angle and relative position relationship with the blade root axis L are used to detect whether the position and parallelism of the bolt sleeve axis relative to the blade root axis meet the requirements.

[0011] Preferably, "measuring the coordinates of each bolt sleeve end face with a laser tracker" specifically means: measuring the coordinates of at least three points on each bolt sleeve end face with a laser tracker, wherein the multiple points are distributed along the circumference of the bolt sleeve end face.

[0012] Preferably, "measuring the coordinates of the outer wall of the blade root cylindrical section with a laser tracker" means: selecting at least three spaced points on an axial line of the outer wall of the blade root cylindrical section radially aligned with the axis of the bolt sleeve to measure the coordinates with a laser tracker.

[0013] Preferably, a starting point, a midpoint and an end point are selected on an axial line of an outer wall of a cylindrical section of a blade root radially aligned with the axis of the bolt sleeve, and point coordinates are measured using a laser tracker.

[0014] Preferably, "measuring the coordinates of the screw polished rod portion of the auxiliary detection screw with a laser tracker" means measuring the coordinates of the starting point position, the midpoint position and the end point position of the screw polished rod portion with a laser tracker.

[0015] Preferably, a laser tracker is used to measure the coordinates of three points distributed circumferentially at the starting point of the screw rod portion, a laser tracker is used to measure the coordinates of three points distributed circumferentially at the midpoint of the screw rod portion, and a laser tracker is used to measure the coordinates of three points distributed circumferentially at the end point of the screw rod portion.

[0016] Preferably, three points distributed circumferentially at the starting point of the polished rod portion of the screw, three points distributed circumferentially at the midpoint, and three points distributed circumferentially at the end point are respectively aligned along the axial direction of the screw.

[0017] The beneficial effects of the invention are:

[0018] The method for detecting the position of the bolt sleeve at the blade root of a wind turbine blade of the present invention uses a laser tracker to measure the coordinate data of the end face of the bolt sleeve at the blade root, the outer wall of the cylindrical section of the blade root and the polished rod part of the screw rod, and according to the measured coordinate data, a common plane P of the end faces of each bolt sleeve, the axis L of the blade root and the axis Li of each screw rod are fitted in mathematical software, and the angle between the axis Li of each screw rod and the common plane P is calculated by mathematical software to detect whether the axis of the bolt sleeve is perpendicular to the end face of the blade root, and the angle and relative position relationship between the axis Li of each screw rod and the axis L of the blade root are calculated to detect whether the position and parallelism of the axis of the bolt sleeve relative to the axis of the blade root meet the requirements, so as to realize the rapid detection of the position of the bolt sleeve at the blade root of the wind turbine blade, effectively improve the detection accuracy of the position of the bolt sleeve of the blade, provide data basis for the accuracy measurement of the blade root connector, so as to evaluate whether the position of the bolt sleeve and the perpendicularity of the bolt sleeve to the end face of the blade root meet the accuracy requirements of the blade root connector, form a reliable detection process before the installation of the wind turbine blade, and avoid the blade that does not meet the accuracy requirements of the blade root connector from being installed on the wind turbine main engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram showing a blade root portion with a bolt sleeve embedded but no screw installed being placed in a blade posture.

[0020] Figure 2 This is a schematic diagram showing the blade root with the auxiliary detection screw installed being placed in a blade posture. DETAILED DESCRIPTION

[0021] Combine the following Figure 1~2 The embodiments of the present invention are described in detail.

[0022] A method for detecting the position of a bolt sleeve at the root of a wind turbine blade is characterized by comprising the following steps:

[0023] Step 1: If Figure 1As shown, the blade root with the bolt sleeve embedded but without the screw rod installed is placed in the shape of a blade, the coordinates of each bolt sleeve end face are measured by a laser tracker, and the coordinates of each bolt sleeve end face are fitted in mathematical software to obtain the common plane P of each bolt sleeve end face;

[0024] Step 2: Use a laser tracker to measure the coordinates of the outer wall of the blade root cylindrical section, fit the coordinates of the outer wall of the blade root cylindrical section in mathematical software to obtain the outer wall surface of the blade root cylindrical section, and calculate the blade root axis L through the outer wall surface of the blade root cylindrical section;

[0025] The third point: Figure 2 As shown, the blade root with the auxiliary detection screw installed is placed in a blade posture, and the coordinates of the screw polished rod part of the auxiliary detection screw are measured with a laser tracker. The coordinates of the screw polished rod part are fitted in mathematical software to obtain the axis L of each screw i ;

[0026] Step 4: Use mathematical software to calculate the axis L of each screw i The angle between the bolt sleeve and the common plane P is used to check whether the axis of the bolt sleeve is perpendicular to the blade root end face and calculate the axis L of each screw. i The angle and relative position relationship with the blade root axis L are used to detect whether the position and parallelism of the bolt sleeve axis relative to the blade root axis meet the requirements.

[0027] The above-mentioned method for detecting the position of the bolt sleeve at the root of a wind turbine blade uses a laser tracker to measure the coordinate data of the end face of the bolt sleeve at the root, the outer wall of the cylindrical section of the blade root and the polished rod part of the screw rod, and the common plane P of the end faces of each bolt sleeve, the axis L of the blade root and the axis Li of each screw rod are fitted in mathematical software according to the measured coordinate data, and the angle between the axis Li of each screw rod and the common plane P is calculated by mathematical software to detect whether the axis of the bolt sleeve is perpendicular to the end face of the blade root, and the angle and relative position relationship between the axis Li of each screw rod and the axis L of the blade root are calculated to detect whether the position and parallelism of the axis of the bolt sleeve relative to the axis of the blade root meet the requirements, so as to realize the rapid detection of the position of the bolt sleeve at the root of the wind turbine blade, effectively improve the detection accuracy of the position of the bolt sleeve of the blade, provide data basis for the accuracy measurement of the blade root connector, so as to evaluate whether the position of the bolt sleeve and the perpendicularity of the bolt sleeve to the end face of the blade root meet the accuracy requirements of the blade root connector, and form a reliable detection process before the installation of the wind turbine blade, so as to avoid the blade that does not meet the accuracy requirements of the blade root connector from being installed on the wind turbine main engine.

[0028] Here, "using a laser tracker to measure the coordinates of each bolt sleeve end face" specifically means: using a laser tracker to measure the coordinates of at least three points on each bolt sleeve end face, with the multiple points distributed along the circumference of the bolt sleeve end face. Figure 1As shown, the bolt sleeve extends from the blade root end surface, and the end surface of the bolt sleeve is located outside the blade root end surface. The coordinates of at least three points are measured on each bolt sleeve end surface. The point coordinates of each bolt sleeve end surface are used to fit the plane where each bolt sleeve end surface is located, that is, the common plane P, in the calculation software.

[0029] Among them, "using a laser tracker to measure the coordinates of the outer wall of the blade root cylindrical section" means: selecting at least three spaced points on the axial line of the outer wall of the blade root cylindrical section radially aligned with the axis of the bolt sleeve to measure the coordinates with a laser tracker. On the outer wall of the blade root cylindrical section, there is an axial line of the outer wall of the blade root cylindrical section radially aligned with the axis of the bolt sleeve, and the axial lines of the outer wall of the blade root cylindrical section corresponding to each bolt sleeve axis are evenly distributed along the circumference of the outer wall of the blade root cylindrical section. At least three spaced points are selected on each axial line of the outer wall of the blade root cylindrical section to measure the coordinates with a laser tracker, so that the points measured by the laser tracker on the outer wall of the blade root cylindrical section are evenly distributed along the circumference, and the distribution positions correspond to the distribution positions of the bolt sleeves.

[0030] Among them, the starting point, midpoint and end point are selected on the axial line of the outer wall of the blade root cylindrical section radially aligned with the axis of the bolt sleeve, and the point coordinates are measured by a laser tracker. The distribution position of the points measuring the coordinates on the axial line of the outer wall of each blade root cylindrical section is the same, ensuring that the outer wall surface of the blade root cylindrical section fitted in the calculation software is closer to the actual outer wall surface, ensuring the accuracy of the detection.

[0031] Among them, "using a laser tracker to measure the coordinates of the screw rod polished part for auxiliary detection of the screw rod" means using a laser tracker to measure the coordinates of the starting point, midpoint and end point of the screw rod polished part. The screw rod polished part is the part of the screw rod extending out of the bolt sleeve. The coordinates of the starting point, midpoint and end point of the polished rod part are measured to fit the axis L of each screw rod in the calculation software. i .

[0032] Among them, the laser tracker is used to measure the coordinates of three points distributed in the circumferential direction at the starting position of the screw polished rod part, the laser tracker is used to measure the coordinates of three points distributed in the circumferential direction at the midpoint position of the screw polished rod part, and the laser tracker is used to measure the coordinates of three points distributed in the circumferential direction at the end point position of the screw polished rod part. The starting position, midpoint position and end point position of the screw polished rod part are all full circles. The coordinates of three points evenly distributed on the full circle are measured, that is, the coordinates of nine points are measured for each screw polished rod part, so as to fit the axis L of each screw in the mathematical software. i .

[0033] Among them, the three points distributed circumferentially at the starting point, the three points distributed circumferentially at the midpoint and the three points distributed circumferentially at the end point of the screw polished rod part are aligned along the screw axial direction. The three points at the starting point, the three points at the midpoint and the three points at the end point of the measured screw polished rod part are aligned along the screw axial direction. The coordinate positions of the points selected at the starting point, the midpoint and the end point are axially aligned. The axis L of the screw obtained by fitting i The accuracy is higher.

[0034] The following is a detailed description of the wind turbine blade root bolt sleeve position detection method by taking an example:

[0035] 1. Place the blade root with embedded bolt sleeves but no screws installed in a blade posture, and use a laser tracker to measure the coordinates of the end face of each bolt sleeve. Measure three data on each bolt sleeve and record them according to the following table. According to the coordinate data in Table 1, fit the plane P of the bolt sleeve in the calculation software.

[0036]

[0037] 2. Select the starting point, midpoint and end point on the axial line of the outer wall of the blade root cylindrical section radially aligned with the axis of the bolt sleeve, and use a laser tracker to measure the point coordinates, and record them according to the following table. According to the coordinate data in Table 2, the outer wall surface of the blade root cylindrical section is fitted in the mathematical software, and the blade root axis L is calculated through the outer wall surface of the blade root cylindrical section;

[0038]

[0039] 3. Use a laser tracker to measure the coordinates of three points distributed in the circumferential direction at the starting point of the screw polished rod part, use a laser tracker to measure the coordinates of three points distributed in the circumferential direction at the midpoint of the screw polished rod part, and use a laser tracker to measure the coordinates of three points distributed in the circumferential direction at the end point of the screw polished rod part. According to the coordinate data in Table 3, the axis L of each screw is obtained by fitting in the mathematical software. i .

[0040]

[0041] 4. Use mathematical software to calculate the axis L of each screw i The angle between the bolt sleeve and the common plane P is used to detect whether the axis of the bolt sleeve is perpendicular to the blade root end face.

[0042] 5. Use mathematical software to calculate the axis L of each screw i The angle and relative position relationship with the blade root axis L are used to detect whether the position and parallelism of the bolt sleeve axis relative to the blade root axis meet the requirements.

[0043] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. Wind turbine blade root bolt sleeve position detection method, Features: The following steps are involved: Step 1: Place the blade root with embedded bolt sleeves but no screws installed in a blade posture, measure the coordinates of each bolt sleeve end face with a laser tracker, and fit the coordinates of each bolt sleeve end face in mathematical software to obtain the common plane P of each bolt sleeve end face; Step 2: Use a laser tracker to measure the coordinates of the outer wall of the blade root cylindrical section, fit the coordinates of the outer wall of the blade root cylindrical section in mathematical software to obtain the outer wall surface of the blade root cylindrical section, and calculate the blade root axis L through the outer wall surface of the blade root cylindrical section; The third point: Place the blade root with the auxiliary detection screw installed in a blade posture, use a laser tracker to measure the coordinates of the screw polished rod part of the auxiliary detection screw, and fit the coordinates of the screw polished rod part in the mathematical software to obtain the axis L of each screw i ; Step 4: Use mathematical software to calculate the axis L of each screw i The angle between the bolt sleeve and the common plane P is used to check whether the axis of the bolt sleeve is perpendicular to the blade root end face and calculate the axis L of each screw. i The angle and relative position relationship with the blade root axis L are used to detect whether the position and parallelism of the bolt sleeve axis relative to the blade root axis meet the requirements.

2. The method for detecting the position of the wind turbine blade root bolt sleeve according to claim 1, Features: "Using a laser tracker to measure the coordinates of each bolt sleeve end face" specifically means: using a laser tracker to measure the coordinates of at least three points on each bolt sleeve end face, and the multiple points are distributed along the circumference of the bolt sleeve end face.

3. The method for detecting the position of the bolt sleeve at the root of a wind turbine blade according to claim 1, Features: "Measuring the coordinates of the outer wall of the blade root cylindrical section with a laser tracker" means: selecting at least three spaced points on the axial line of the outer wall of the blade root cylindrical section radially aligned with the axis of the bolt sleeve to measure the coordinates with a laser tracker.

4. The method for detecting the position of the bolt sleeve at the root of a wind turbine blade according to claim 3, Features: The starting point, the middle point and the end point are selected on the axial line of the outer wall of the cylindrical section of the blade root radially aligned with the axis of the bolt sleeve, and the point coordinates are measured using a laser tracker.

5. The method for detecting the position of the bolt sleeve at the root of a wind turbine blade according to claim 1, Features: "Using a laser tracker to measure the coordinates of the screw polished rod portion of the auxiliary detection screw" means using a laser tracker to measure the coordinates of the starting point position, midpoint position and end point position of the screw polished rod portion.

6. The method for detecting the position of the bolt sleeve at the root of a wind turbine blade according to claim 5, Features: Use a laser tracker to measure the coordinates of three points distributed circumferentially at the starting point of the screw rod part, use a laser tracker to measure the coordinates of three points distributed circumferentially at the midpoint of the screw rod part, and use a laser tracker to measure the coordinates of three points distributed circumferentially at the end point of the screw rod part.

7. The method for detecting the position of the bolt sleeve at the root of a wind turbine blade according to claim 6, Features: Three points distributed in the circumferential direction at the starting point of the polished rod part of the screw, three points distributed in the circumferential direction at the midpoint and three points distributed in the circumferential direction at the end point are respectively aligned along the axial direction of the screw.

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