Flaw detection device used before installation of wind driven generator blade

Abstract

The invention discloses a flaw detection device used before installation of wind driven generator blades, and relates to the technical field of flaw detection, the flaw detection device comprises a mobile rack, the mobile rack is rotatably connected with bearing wheels symmetrically distributed along the mobile rack, the mobile rack is slidably connected with guide rails symmetrically distributed along the mobile rack, and the bearing wheels roll in the guide rails; a wire guide ring is fixedly connected into the movable rack, a sliding frame is connected to the wire guide ring in a sliding mode, the sliding frame is fixedly connected with at least one first motor, output shafts of the first motors are fixedly connected with conveying wheels, and the conveying wheels roll along the wire guide ring. According to the invention, the thermal imaging detector is used for carrying out large-range flaw detection on the generator blade at a relatively far distance, the flaw detection range is ensured, local flaws are prevented from being omitted, and after the flaws are detected, the thermal imaging detector automatically detects the generator blade at a relatively close distance, so that finer temperature distribution information can be captured, and the detection accuracy is improved. Therefore, fine defects on the surface of the blade can be more clearly detected, and the resolution ratio of flaw detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flaw detection, and in particular to a flaw detection device before installation of a wind turbine blade. Background Art

[0002] Blades are among the most environmentally sensitive components in wind turbines. Prolonged exposure to adverse weather conditions (such as strong winds, heavy rain, and lightning strikes) can lead to cracks, delamination, and debonding. If these problems are not discovered and repaired promptly, they can lead to serious safety accidents such as blade breakage or even the collapse of the entire wind turbine.

[0003] Crack detection in wind turbine blades is a crucial step in ensuring their structural integrity and safety. Thermal imaging is a common flaw detection method. Its principle is that the local stress concentration caused by cracks leads to temperature changes that are sensitive to certain factors. This difference is particularly pronounced after an excitation process (such as heating the blade). Thermal imagers can quickly scan and generate temperature distribution images across the entire blade surface, enabling large-area inspections to be completed in a short period of time. This makes them suitable for preliminary screening, especially when rapidly scanning large areas. While the resolution of modern thermal imagers continues to improve, they can still struggle with resolution limitations for very fine cracks or early-stage damage. Low resolution can make it difficult to clearly identify subtle defects. Summary of the Invention

[0004] In order to overcome the disadvantage that thermal imagers have advantages in rapid scanning of large areas but low resolution may make it impossible to clearly identify subtle defects, the present invention provides a pre-installation flaw detection device for wind turbine blades.

[0005] A device for detecting flaws before installing blades of a wind turbine generator comprises a mobile frame, the mobile frame is rotatably connected to load-bearing wheels symmetrically distributed along the mobile frame, the mobile frame is slidably connected to guide rails symmetrically distributed along the mobile frame, the load-bearing wheels roll in the guide rails, a wire ring is fixed inside the mobile frame, a sliding frame is slidably connected to the wire ring, the sliding frame is fixed to at least one first motor, the output shaft of the first motor is fixed to a conveying wheel, the conveying wheel rolls along the wire ring, the sliding frame is fixed to a hot air blower, the sliding frame is slidably connected to a thermal imaging detector, the thermal imaging detector is electrically connected to the first motor through a control module, a second motor is fixed inside the sliding frame, the thermal imaging detector is electrically connected to the second motor through the control module, the output shaft of the second motor is fixed to a screw, and the screw is threadedly connected to the thermal imaging detector.

[0006] Optionally, the movable frame and the wire ring are both configured to be arched.

[0007] Optionally, the first motor is configured as a dual-axis motor.

[0008] Optionally, it also includes a first sliding sleeve, which is fixedly connected to the thermal imaging detector and slidingly connected to the hot air blower. An air guide ring is fixedly connected inside the first sliding sleeve, and the hot air blown out of the hot air blower is guided to the blade surface through the air guide ring.

[0009] Optionally, a fixed frame is further included, which is fixedly connected to the sliding frame. The fixed frame is slidably connected to limit blocks symmetrically distributed along the fixed frame, and the sliding frame is provided with a pushing component for pushing the limit blocks to slide until they contact the wire loop.

[0010] Optionally, the pushing assembly includes a first connecting rod, the first connecting rod is rotatably connected to the thermal imaging detector, the sliding frame is rotatably connected to a rotating disk, the rotating disk is rotatably connected to the first connecting rod, the rotating disk has a guide groove, the limit block is rotatably connected to the second connecting rod, the fixed frame is rotatably connected to the rotating rod, the second connecting rod is rotatably connected to the rotating rod, the sliding frame is slidably connected to the sliding rod, the sliding rod is rotatably connected to the adjacent limit block, and the sliding rod is slidably connected to the guide groove of the rotating disk.

[0011] Optionally, it also includes a circumferentially distributed telescopic rod, the telescopic rod is fixedly connected to the hot air blower, the first sliding sleeve is rotatably connected to a circumferentially distributed rotating block, the rotating block is movably connected to the corresponding telescopic rod, the first sliding sleeve is slidably connected to the second sliding sleeve, and a third connecting rod is rotatably connected between the rotating block and the second sliding sleeve.

[0012] Optionally, a dust removal pipe is further included, which is fixed to one side of the mobile frame and is externally connected to an air pump.

[0013] The present invention has the following advantages: the present invention uses a thermal imaging detector to perform large-scale flaw detection on the generator blades at a relatively long distance, thereby ensuring the flaw detection range and avoiding missing local flaws. After detecting the flaws, the thermal imaging detector automatically detects the generator blades at a relatively close distance, thereby being able to capture more detailed temperature distribution information, and further being able to more clearly detect subtle defects on the blade surface, thereby improving the resolution of flaw detection.

[0014] When the output shaft of the first motor stops rotating, the limit block clamps the wire loop, thereby increasing the friction force and preventing the conveying wheel from slipping on the wire loop.

[0015] When the present invention performs close-range flaw detection on a blade, the hot air guided by the air guide ring can be gathered by the second sliding sleeve to a local part of the blade, which is beneficial for the thermal imaging detector to capture more detailed temperature distribution information.

[0016] The present invention blows dust removal air onto the blades through the dust removal pipe, removes dust on the blade surface, and prevents the dust from affecting the detection result of the thermal imaging detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a sectional view of the three-dimensional structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the first motor, conveying wheel, hot air blower and other components of the present invention.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the components such as the conveying wheel, hot air blower and sliding sleeve of the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the fixing frame, the limiting block and the rotating rod and other components of the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing frame, the limiting block and the connecting rod of the present invention.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the telescopic rod, rotating block, third connecting rod and other components of the present invention.

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the rotating block, the second connecting rod, the sliding sleeve and other components of the present invention.

[0025] Figure 9 It is a schematic diagram of the three-dimensional structure of the movable frame and dust removal pipe components of the present invention.

[0026] Among them, the above-mentioned drawings include the following figure marks: 101, mobile frame, 102, load-bearing wheel, 103, guide rail, 104, wire ring, 105, sliding frame, 106, first motor, 107, conveying wheel, 108, hot air blower, 109, thermal imaging detector, 110, second motor, 111, screw, 201, first sliding sleeve, 202, air guide ring, 301, first connecting rod, 302, rotating disk, 303, fixed frame, 304, limit block, 305, second connecting rod, 306, rotating rod, 307, sliding rod, 401, telescopic rod, 402, rotating block, 403, third connecting rod, 404, second sliding sleeve, 501, dust removal pipe. DETAILED DESCRIPTION

[0027] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and will fully convey the scope of the invention to those skilled in the art.

[0028] Example 1: A wind turbine blade pre-installation flaw detection device, such as Figure 1 and Figure 2 As shown, it includes a mobile frame 101, the bottom of the mobile frame 101 is rotatably connected to five groups of load-bearing wheels 102 symmetrically distributed along the left and right sides of the mobile frame 101, the bottom of the mobile frame 101 is slidably connected to guide rails 103 symmetrically distributed along the left and right sides of the mobile frame 101, the load-bearing wheels 102 roll in the guide rails 103, the interior of the mobile frame 101 is fixed with a wire ring 104, the mobile frame 101 and the wire ring 104 are both configured as arches, the wire ring 104 is slidably connected to a sliding frame 105, and the sliding frame 105 is fixed to four first motors 106, the first motor 106 is configured as a dual-axis motor, and the first motor 106 on both sides is fixed. The output shafts are all fixedly connected with a conveying wheel 107, which rolls along the wire ring 104. A hot air blower 108 is fixedly connected to the top of the sliding frame 105, and the hot air blower 108 blows hot air toward the wind turbine blades. A thermal imaging detector 109 is slidably connected to the sliding frame 105, and the thermal imaging detector 109 is electrically connected to the first motor 106 through the control module. A second motor 110 is fixedly connected to the sliding frame 105, and the thermal imaging detector 109 is electrically connected to the second motor 110 through the control module. A screw 111 is fixedly connected to the output shaft of the second motor 110 through a coupling, and the screw 111 is threadedly connected to the thermal imaging detector 109.

[0029] First, place the blades of the wind turbine under the mobile frame 101, then start the first motor 106 and the hot air blower 108. The output shaft of the first motor 106 drives the conveying wheel 107 on it to rotate. The conveying wheel 107 rolls back and forth on the surface of the wire loop 104, thereby causing the sliding frame 105 to slide back and forth along the wire loop 104. The hot air blower 108, thermal imaging detector 109, second motor 110 and screw 111 on the sliding frame 105 move back and forth synchronously as a whole. The hot air blower 108 blows hot air to the surface of the blade. The thermal imaging detector 109 detects the temperature distribution of the entire blade surface and generates a thermal image, thereby achieving large-scale flaw detection on the blade. During the large-scale flaw detection process, when the thermal imaging detector 109 detects that the local temperature of the blade surface has changed significantly and the temperature change is within the set range, the thermal imaging detector 109 sends an electrical signal, the control module receives the electrical signal, and controls the output shaft of the first motor 106 to stop rotating, and at the same time controls the output shaft of the second motor 110 to rotate, thereby driving the screw 111 to rotate, so that the thermal imaging detector 109 slides along the sliding frame 105 to the side close to the blade, so that the thermal imaging detector 109 can capture more detailed temperature distribution information, and through the temperature change set within the set range of the thermal imaging detector 109, when the high-resolution flaw detection is completed, the control module controls the output shaft of the second motor 110 to rotate in the opposite direction, thereby driving the screw 111 to reverse, so that the thermal imaging detector 109 slides along the sliding frame 105 to the side away from the blade, and restores the large-scale flaw detection mode.

[0030] After completing the flaw detection of the generator blade, the movable frame 101 is controlled to slide forward or backward along the guide rail 103, so that the movable frame 101 drives the components thereon to move forward or backward, thereby allowing the thermal imaging detector 109 to move to the next generator blade to continue the flaw detection process.

[0031] In summary, the present invention uses the thermal imaging detector 109 to perform large-scale flaw detection on the generator blades at a relatively long distance, thereby ensuring the detection range and avoiding missing local flaws. After detecting the flaws, the thermal imaging detector 109 automatically detects the generator blades at a relatively close distance, thereby capturing more detailed temperature distribution information, and then being able to more clearly detect subtle defects on the blade surface, thereby improving the resolution of flaw detection.

[0032] Example 2: Based on Example 1, Figure 3 and Figure 4 As shown, it also includes a first sliding sleeve 201, the first sliding sleeve 201 is fixedly connected to the top of the thermal imaging detector 109, the first sliding sleeve 201 is slidably connected to the hot air blower 108 and is interconnected, and an air guide ring 202 is fixedly connected inside the first sliding sleeve 201, and the hot air blown out of the hot air blower 108 is guided to the blade surface through the air guide ring 202.

[0033] like Figure 7 and Figure 8 As shown, it also includes three circumferentially distributed telescopic rods 401, the fixed ends of the telescopic rods 401 are fixedly connected to the hot air blower 108, and the outer side of the first sliding sleeve 201 is rotatably connected to three circumferentially distributed rotating blocks 402. The rotating blocks 402 are movably connected to the telescopic ends of the corresponding telescopic rods 401 through movable grooves. The outer side of the first sliding sleeve 201 close to the air outlet port is slidably connected to the second sliding sleeve 404, and a third connecting rod 403 is rotatably connected between the rotating block 402 and the second sliding sleeve 404.

[0034] As the first sliding sleeve 201 slides toward the side close to the blade along with the thermal imaging detector 109, the rotating block 402, the third connecting rod 403 and the second sliding sleeve 404 move synchronously as a whole, and the telescopic rod 401 is stretched. When the telescopic rod 401 is stretched to its limit, one end of the rotating block 402 is limited by the telescopic rod 401, so that it will continue to rotate as it moves. When the rotating block 402 rotates, it pushes the second sliding sleeve 404 to slide further toward the side close to the blade relative to the first sliding sleeve 201 through the third connecting rod 403. In this way, the hot air exported through the air guide ring 202 can be gathered by the second sliding sleeve 404 to a local part of the blade, which is conducive to the thermal imaging detector 109 to capture more detailed temperature distribution information. Conversely, the telescopic rod 401 contracts and resets, and the rotating block 402 pulls the second sliding sleeve 404 to slide further toward the side away from the blade relative to the first sliding sleeve 201 through the third connecting rod 403.

[0035] like Figure 5 and Figure 6 As shown, it also includes a first connecting rod 301, the first connecting rod 301 is rotatably connected to the thermal imaging detector 109, the sliding frame 105 is rotatably connected to a rotating disk 302, the rotating disk 302 is rotatably connected to the first connecting rod 301, the rotating disk 302 is provided with a guide groove, the sliding frame 105 is fixedly connected to a fixed frame 303, the fixed frame 303 is slidably connected to a limit block 304 symmetrically distributed along the left and right sides of the fixed frame 303, the front side of the limit block 304 is rotatably connected to the second connecting rod 305, the middle front side of the fixed frame 303 is rotatably connected to a rotating rod 306, the second connecting rod 305 is rotatably connected to the rotating rod 306, the sliding frame 105 is slidably connected to a sliding rod 307, the sliding rod 307 is rotatably connected to the limit block 304 on the right, and the sliding rod 307 is slidably connected to the guide groove of the rotating disk 302.

[0036] When the thermal imaging detector 109 slides toward the side close to the blade, the rotating disk 302 is driven to rotate through the first connecting rod 301, and the rotating disk 302 pushes the sliding rod 307 to slide toward the side close to the rotating rod 306 through the guide groove. The sliding rod 307 drives the right limit block 304 to slide until it contacts the wire loop 104. At the same time, the limit block 304 pushes the rotating rod 306 to rotate through the second connecting rod 305 on the right, and the rotating rod 306 drives the left limit block 304 to slide until it contacts the wire loop 104 through the second rotating rod 306 on the left. In this way, when the output shaft of the first motor 106 stops rotating, the wire loop 104 is clamped by the limit block 304 to increase the friction force and prevent the conveying wheel 107 from slipping on the wire loop 104.

[0037] When the thermal imaging detector 109 slides to the side away from the blade, the rotating disk 302 is driven to reverse through the first connecting rod 301, and the rotating disk 302 pulls the sliding rod 307 to slide to the side away from the rotating rod 306 through the guide groove. The sliding rod 307 drives the right limit block 304 to slide and disengage from the wire ring 104 through the second connecting rod 305 on the right. At the same time, the sliding rod 307 pushes the rotating rod 306 to rotate in the opposite direction through the second connecting rod 305 on the left. The rotating rod 306 drives the left limit block 304 to slide and disengage from the wire ring 104 through the second rotating rod 306 on the left. In this way, it does not affect the rolling of the conveying wheel 107 on the wire ring 104.

[0038] Example 3: Based on Example 2, Figure 9 As shown, a dust removal pipe 501 is also included. The dust removal pipe 501 is fixedly connected to the rear side of the mobile frame 101. The dust removal pipe 501 is externally connected to an air pump. When the air pump is started, the air flow passes through the dust removal pipe 501 and blows onto the blades to remove dust on the surface of the blades, thereby preventing dust from affecting the detection results of the thermal imaging detector 109.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wind turbine blade pre-installation flaw detection device, comprising a movable frame (101), the movable frame (101) being rotatably connected to bearing wheels (102) symmetrically distributed along the movable frame (101), the movable frame (101) being slidably connected to guide rails (103) symmetrically distributed along the movable frame (101), the bearing wheels (102) rolling in the guide rails (103), a wire ring (104) being fixedly connected inside the movable frame (101), a sliding frame (105) being slidably connected to the wire ring (104), the sliding frame (105) being fixedly connected to at least one first motor (106), an output shaft of the first motor (106) being fixedly connected to a conveying wheel (107), the conveying wheel (107) rolling along the wire ring (104), the sliding frame (105) being fixedly connected to a hot air blower (108), and the sliding frame (105) being slidably connected to a thermal imaging detector (109); Its characteristics are: The thermal imaging detector (109) is electrically connected to the first motor (106) through a control module, a second motor (110) is fixedly connected to the sliding frame (105), the thermal imaging detector (109) is electrically connected to the second motor (110) through the control module, an output shaft of the second motor (110) is fixedly connected to a screw (111), and the screw (111) is threadedly connected to the thermal imaging detector (109).

2. A wind turbine blade pre-installation flaw detection device according to claim 1, characterized in that: The movable frame (101) and the wire ring (104) are both arranged in an arch shape.

3. The wind turbine blade pre-installation flaw detection device according to claim 2 is characterized in that: The first motor (106) is configured as a dual-axis motor.

4. The wind turbine blade pre-installation flaw detection device according to claim 3 is characterized in that: The invention also includes a first sliding sleeve (201), the first sliding sleeve (201) is fixedly connected to the thermal imaging detector (109), the first sliding sleeve (201) is slidably connected to the hot air blower (108), and an air guide ring (202) is fixedly connected inside the first sliding sleeve (201), and the hot air blown out by the hot air blower (108) is guided to the blade surface through the air guide ring (202).

5. The wind turbine blade pre-installation flaw detection device according to claim 4 is characterized in that: The invention also includes a fixed frame (303), the fixed frame (303) is fixedly connected to the sliding frame (105), the fixed frame (303) is slidably connected to the limit blocks (304) symmetrically distributed along the fixed frame (303), and the sliding frame (105) is provided with a pushing component for pushing the limit blocks (304) to slide until they contact the wire loop (104).

6. The wind turbine blade pre-installation flaw detection device according to claim 5, characterized in that: The pushing assembly includes a first connecting rod (301), the first connecting rod (301) is rotatably connected to the thermal imaging detector (109), the sliding frame (105) is rotatably connected to a rotating disk (302), the rotating disk (302) is rotatably connected to the first connecting rod (301), the rotating disk (302) is provided with a guide groove, the limiting block (304) is rotatably connected to the second connecting rod (305), the fixed frame (303) is rotatably connected to a rotating rod (306), the second connecting rod (305) is rotatably connected to the rotating rod (306), the sliding frame (105) is slidably connected to a sliding rod (307), the sliding rod (307) is rotatably connected to an adjacent limiting block (304), and the sliding rod (307) is slidably connected to the guide groove of the rotating disk (302).

7. The wind turbine blade pre-installation flaw detection device according to claim 6 is characterized in that: The invention also includes a circumferentially distributed telescopic rod (401), the telescopic rod (401) is fixedly connected to the hot air blower (108), the first sliding sleeve (201) is rotatably connected to a circumferentially distributed rotating block (402), the rotating block (402) is movably connected to the corresponding telescopic rod (401), the first sliding sleeve (201) is slidably connected to the second sliding sleeve (404), and a third connecting rod (403) is rotatably connected between the rotating block (402) and the second sliding sleeve (404).

8. The wind turbine blade pre-installation flaw detection device according to claim 7 is characterized in that: The mobile frame (101) further comprises a dust removal pipe (501), which is fixed to one side of the mobile frame (101) and is externally connected to an air pump.

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