Method for efficiently and accurately detecting bonding gap of wind power blade

Abstract

The invention provides a method for efficiently and accurately detecting a bonding gap of a wind power blade, which comprises the following steps of: in a wind power blade bonding test mold closing process, pretreating a bonding area, placing a test strip in the bonding area, and overturning a mold to carry out a glue pressing test; judging a qualified area according to the color of the test strip; performing secondary test on the unqualified area to obtain a secondary test result; wherein the test strip is made of a piezochromic material. According to the method for efficiently and accurately detecting the bonding gap of the wind power blade, the material with the stress deformation capacity is adopted, different color changes can be generated when the deformation reaches a certain value, whether the wind power blade is qualified or not can be judged by directly observing the color, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade bonding gap detection, and in particular to a method for efficiently and accurately detecting a wind turbine blade bonding gap. Background Art

[0002] Bonding is a key process in the wind turbine blade molding process, and the quality of bonding directly affects the safety of product operation. At present, the bonding gap test mainly adopts placing a plasticine stick in the bonding area, or wrapping a single-component adhesive with a vacuum film and spreading it flat in the bonding area in combination with a plasticine stick. After the plasticine or single-component adhesive is squeezed and deformed by flipping the test mold, a vernier caliper is used to test the plasticine thickness data and visually observe the deformation of the single-component adhesive, so as to achieve the purpose of collecting bonding gap data and identifying gap anomalies such as holding points.

[0003] The current requirements for the placement of plasticine are 0.5 meters per piece within the range from the root to 60% of the blade length, and 1 meter per piece at other locations. A 100-meter-class blade probably needs to be placed with more than 700 pieces of plasticine. Each plasticine test has about 3 points, and more than 2,000 tests are required. A single group of personnel needs more than 3 hours to test, which is time-consuming and has low test efficiency. The hardness, diameter, and length of the plasticine stick, the thickness of the single-component tape, the uniformity and continuity of the adhesive layer, the skin temperature, the test error and other variables lead to poor accuracy and stability of the adhesive layer gap data. Summary of the invention

[0004] One of the purposes of the present invention is to provide a method for efficiently and accurately detecting the bonding gap of wind turbine blades. By using materials that have the ability to deform under force, different color changes will occur when the deformation reaches a certain value, so that direct visual color can be used to judge whether it is qualified, thereby improving detection efficiency.

[0005] An embodiment of the present invention provides a method for efficiently and accurately detecting a bonding gap of a wind turbine blade, comprising:

[0006] During the bonding test mold closing process of the wind turbine blade, the bonding area is pre-treated, the test strip is placed in the bonding area, and the mold is turned over for glue pressing test;

[0007] Determine the qualified area according to the color of the test strip;

[0008] Conduct a second test on the unqualified areas and determine the disposal plan based on the test results.

[0009] Wherein, the test strip is made of piezochromic material.

[0010] Preferably, the molecular formula of the piezochromic material is: 38 H 26 N 2O4 .

[0011] Preferably, the test strip is configured to have a thickness of 20 mm.

[0012] Preferably, the first color is used when the thickness is greater than 10 mm, the second color is used when the thickness is 3-10 mm, and the third color is used when the thickness is less than 3 mm.

[0013] Preferably, axial scale lines are printed on the upper surface of the test strip.

[0014] Preferably, the upper surface of the test strip is printed with chordal scale lines.

[0015] Preferably, the pretreatment includes: cleaning or grinding of dust, foreign matter, warped edges, and protrusions.

[0016] Preferably, the width of the test strip is configured to be greater than the minimum bonding width of each bonding area.

[0017] Preferably, the secondary test method includes: testing using a vernier caliper.

[0018] Preferably, the qualified area is determined by whether the color of the test strip is the second color.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. It can be widely used in blade types that require bonding gap testing. At present, all blade types require bonding gap testing, so the application range is relatively wide and will produce greater social and economic benefits;

[0021] 2. After solving the problem of low efficiency of bonding gap test, a single blade can reduce the test time, shorten the mold cycle, and improve the blade output;

[0022] 3. After the accuracy of the bonding gap test is solved, defects can be accurately identified, the bonding quality can be improved, the root cause of the gap exceeding the standard can be accurately found and adjusted, and the gap can be quickly stabilized. After the bonding gap exceeding the standard is completely solved, the maintenance cost of a single blade is saved, and the maintenance cost includes materials and labor;

[0023] Fourth, by innovating the materials used in bonding tests, the goal of solving the low efficiency and poor accuracy of wind turbine blade bonding gap testing can be achieved.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of a method for efficiently and accurately detecting a bonding gap of a wind turbine blade according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of color change caused by extrusion deformation of the test strip in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] The embodiment of the present invention provides a method for efficiently and accurately detecting the bonding gap of wind turbine blades. Figure 1 As shown, including:

[0031] Step S1: During the bonding test mold closing process of the wind turbine blade, the bonding area is pre-treated, a test strip is placed in the bonding area, and the mold is turned over to perform a glue pressing test;

[0032] The pretreatment of the bonding area includes: cleaning or grinding of dust, foreign matter, warping, protrusions, etc. The pretreatment of the bonding area ensures that interference factors that affect the test accuracy are removed to improve the test accuracy.

[0033] Wherein, the test strip is a piezochromic material, and its molecular formula is: C 38 H 26 N 2O4 In order to improve the testing efficiency, it is necessary to find a piezochromic material that will change color when squeezed to replace the rubber rod. Its molecular formula is: C 38 H 26 N 2O4 This material has the ability to deform under stress. When the deformation reaches a certain value, different color changes will occur. The shape and color changes can be maintained for 60 minutes after the pressure disappears. After 60 minutes, the original shape and color can be restored. It can be reused, is light in weight, easy to carry, and environmentally friendly.

[0034] According to the current acceptable range of 3-10mm for the bonding gap of wind turbine blades, the material is used to make a bonding gap "test strip", the width of which is greater than the minimum bonding width of each bonding area, the length is made according to the principle that the weight meets the handling conditions, the thickness is 20mm, and the axial and chord scale lines are printed on the upper surface; the color change of the material after compression deformation is color A (i.e. the first color) when the thickness is greater than 10mm, color B (i.e. the second color) when the thickness is 3-10mm, and color C (i.e. the third color) when the thickness is less than 3mm, as shown in the following figure. Figure 2 shown.

[0035] Wherein, axial and / or chordal scale lines are printed on the upper surface of the test strip to facilitate the staff to read relevant data when using it.

[0036] Step S2: Determine the qualified area according to the color of the test strip;

[0037] When the color of the test strip is the second color, it means that the gap is 3-10mm, which is in line with the acceptable range of the wind turbine blade bonding gap, and the bonding area can be judged as a qualified area;

[0038] Step S3: Perform a secondary test on the unqualified area to obtain a secondary test result.

[0039] Use a vernier caliper to test the gap data of the area that exceeds the standard (i.e. the unqualified area) so that the staff can deal with it according to the plan. After the treatment is completed, try the mold again until the bonding gap is within the qualified range.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for efficiently and accurately detecting the bonding gap of a wind turbine blade, characterized in that: include: During the bonding test mold closing process of the wind turbine blade, the bonding area is pre-treated, the test strip is placed in the bonding area, and the mold is turned over for glue pressing test; Determine the qualified area according to the color of the test strip; Conduct secondary testing on the unqualified area and obtain secondary test results; Wherein, the test strip is made of piezochromic material.

2. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: The molecular formula of the piezochromic material is: C 38 H 26 N 2O4 .

3. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: The test strip is configured to have a thickness of 20 mm.

4. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 3, characterized in that: When the thickness is greater than 10mm, it is the first color; when the thickness is 3-10mm, it is the second color; when the thickness is less than 3mm, it is the third color.

5. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: Axial scale lines are printed on the upper surface of the test strip.

6. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: The upper surface of the test strip is printed with chordal scale lines.

7. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: Preprocessing includes: Clean or polish dust, foreign matter, warped edges, and protrusions.

8. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: The width of the test strip is configured to be greater than the minimum bonding width of each bonding area.

9. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: Secondary testing methods include: testing using a vernier caliper.

10. The method for efficiently and accurately detecting the bonding gap of a wind turbine blade according to claim 1, characterized in that: The qualified area is determined by whether the color of the test strip is the second color.

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